CN113927438B

CN113927438B - Screw tap machining center and machining method

Info

Publication number: CN113927438B
Application number: CN202111117338.1A
Authority: CN
Inventors: 王宏波; 李文磊; 张剑
Original assignee: Zhejiang Ivke Machinery Technology Co ltd
Current assignee: Zhejiang Ivke Machinery Technology Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-11-04
Anticipated expiration: 2041-09-23
Also published as: CN113927438A

Abstract

The invention relates to the technical field of tap manufacturing, in particular to a tap machining center and a machining method.

Description

Screw tap machining center and machining method

Technical Field

The invention relates to the technical field of screw tap manufacturing, in particular to a screw tap machining center and a screw tap machining method.

Background

At present, the processing equipment used in the tool processing industry is mainly domestic equipment with limited processing capacity of some procedures, and generally, the manufacture of one tool can be completed only by processing in a plurality of machine tools, so that the product cost is invisibly improved, and the processing precision of the tool is limited by clamping and processing for a plurality of times; the adoption of imported high-end equipment is high in cost, and the quality requirement on operators is high. The imported high-end equipment then meets this market demand by purchasing the medium-end domestic machine tools.

The material, shape and coating technology of the tools are subject to day-to-day variations, and even tool manufacturers have developed tools with specific geometrical parameters. This requires that the core manufacturing equipment of modern tools, namely, the numerical control tool grinder, not only have conventional grinding processing capability, but also have various capabilities such as pressure grinding and the like.

With the rapid development of modern manufacturing industry, customers must pursue high quality and high stability products. Meanwhile, some difficult-to-machine materials, such as special alloy materials, composite materials or a combination of the two, have been increasingly widely used in the new generation of products. This means that the manufacturers of machining tools have made more demands, and the development of tools will be greatly changed.

The patent document with publication number CN213438639U discloses a combined grinding machine for machining standard cutters simultaneously, which comprises a base, wherein a machining spindle body is arranged at the center of the top surface of the base, the machining spindle body is rotationally connected with the base, the machining spindle body comprises a plurality of side surfaces, each side surface is provided with a clamping part for clamping a workpiece, and the base is provided with cutting parts with different machining angles corresponding to the number of the side surfaces of the machining spindle body at the periphery of the machining spindle body; the machining main shaft body rotates through the bottom to match with different cutting parts to machine the workpiece clamped in the cutting parts at the same time; a mechanical arm for switching the cut workpiece and the uncut workpiece is arranged on one side of the base; the machining spindle body switches different cutting processes of the workpiece clamped by each surface by rotating and switching different cutting parts, and each side surface is used as a switching interval according to the cutting time of the cutting part with the largest machining time length.

The patent document with publication number CN209681870U discloses a six-station rotary multifunctional full-automatic digital grinding machine device, which is provided with a frame assembly, wherein the upper end of the frame assembly is provided with a rotary indexing assembly, and a plane grinding assembly, a left side chamfering assembly, a slotting assembly, an automatic feeding assembly, an automatic discharging assembly and a right side chamfering assembly are arranged at an included angle of 60 degrees with the center line of the rotary indexing assembly as the center of a circle in an equal distribution manner.

Patent document with publication number CN110977716A discloses a multi-station turret horizontal grinder, which comprises a working head, a grinding mechanism and a sand repairing mechanism; the working head comprises a working head base, a first DD motor and a working head assembly; the first DD motor is fixed above the working head base; the working head assembly is arranged above the first DD motor; the sand trimming mechanism is arranged on the right side of the working head in parallel; the polishing mechanism is arranged on the front side of the working head and the sand dressing mechanism and comprises an X-axis linear driving assembly, a Y-axis linear driving assembly, a second DD motor, a rotating plate, four groups of polishing assemblies and a probe; the Y-axis linear driving assembly is arranged at the power output end of the X-axis linear driving assembly; the second DD motor is arranged at the power output end of the Y-axis linear driving assembly; the rotating plate is arranged at a power output end above the second DD motor; the four groups of grinding assemblies are respectively arranged at four corners of the rotating plate; the probe is arranged on one side of the rotating plate.

At present, screw tap grinding equipment mainly adopts profile grinding of a hydraulic grinder, and has the defects of poor grinding precision, low production efficiency and the like. Although individual enterprises change the current hydraulic profiling into a numerical control mode, the mechanical manufacturing precision of the numerical control machine does not meet the use requirement, and the numerical control instruction only has a circular interpolation instruction of a two-axis linkage mode, the common numerical control instruction used on the right side of a common numerical control grinding machine cannot complete the machining of the surface of a cutter with a space curved surface and needing three-axis linkage, the machining mode can only be cutting in a two-axis linkage approximation mode, and the full-automatic streamlined operation cannot be realized, so that the production efficiency cannot be improved, and the product quality has many defects.

In order to realize grinding, the traditional grinding method only uses a large-diameter grinding wheel due to product indent caused by grinding wheel tangent, the grinding wheel with the diameter of 750MM-900MM is generally used for processing, but the grinding wheel can only meet the product requirements below M16, large-size products are mostly subjected to milling processing before quenching, the surface of the large-size products is deformed after heat treatment, the quality of a screw tap is influenced, the grinding wheel is too large, the power of a corresponding main shaft is also large, the structure of a machine tool is complex, the energy consumption is high, and the market has strong requirements on new technology application.

The requirements of all working procedures on rotation precision are high in the machining of the screw tap, the reference of the screw tap is two center holes, all machining precision uses two centers as the reference, the hardness of materials is high, the diameter is small, simultaneous positioning and zero clearance driving are achieved in the machining, the traditional machine tool is single in working procedure, floating driving can be used in all the working procedures except groove grinding, most of the working procedures can be machined by connecting the two centers with the floating driving, the inner cone center is directly used in groove grinding, accuracy deviation is large due to the fact that the reference is not uniform, due to the fact that no good solution exists, a tool manufacturer can widen a tolerance zone at the position without any limitation, the influence on products is large, front tool faces are not divided due to jumping, and the service life of the screw tap is greatly shortened.

8 processes are completed by 8 machine tools of a sharpening machine, a square grinding machine, a diameter grinding machine, a groove grinding machine, a handle cylindrical grinding machine, a blade cylindrical grinding machine, a screw tap thread grinding machine and a screw tap relief grinding machine in the machining process of the screw tap, the product process flow is overlong, the occupied area of equipment is large, the equipment operation and debugging personnel are more, and the production cost of enterprises is high.

At present, most of industrial equipment is self-made special machine tools by enterprises, machine tools distributed to manufacturers in planned economic national layout belong to manual semi-automatic machine tools, the requirements on operators are high, qualified products can be made only by completely mastering the machine tool performance, and the culture period is long. The machine tool is not ideal in stability, a large number of screw tap grinding devices are imported by domestic main screw tap manufacturers with the support of the nation, the average price of a single screw tap exceeds 300 million RMB, and the later maintenance and use cost is hard to bear by general enterprises, so that the market competitiveness of the domestic screw tap is severely restricted. The domestic high-end tap market is occupied by foreign brands for a long time.

The major production factories abroad are a few companies such as Nomak, delake, yorking in Germany, SMS, etc. in the United states. Several domestic production enterprises are not in scale, and part of machine tools are self-made by enterprises. The machine is five-door and eight-door, has no unified standard, and the later maintenance cost cycle is high.

Traditional processing equipment, the process is single, the process is many, it is loaded down with trivial details to process, single unit operation, workman intensity of labour is big, the environment is abominable, the environmental protection requirement is not up to standard, need manual operation, harm is big to workman's health, the emery wheel hinders people easily, some producers use five-axis tool grinder processing, precision and operating environment are very improved, but there is the multiple operation grinding, and is inefficient, the equipment productivity is lower, area is big, can process one process after one process processing is accomplished, and at the in-process of last unloading, anchor clamps only have one and press from both sides the dress station, need twice actions of arm to accomplish when installing the raw materials and taking off the finished product, the repeated route, the extension latency.

Disclosure of Invention

The invention provides a screw tap machining center, overcomes the defects of the right-hand prior art, effectively solves the problems of screw tap machining sub-procedure and sub-machine bed operation, overlong product process flow, large equipment floor area, long material tray exchange time and high operator management cost of the conventional screw tap machining equipment,

the invention further solves the problems of single process, complex processing, high labor intensity of workers, severe environment and unqualified environmental protection requirements.

One of the technical schemes of the invention is realized by the following measures: a tap machining center comprises a workbench, a material rack, a laser marker, a hydraulic rotary table, a mechanical arm, a square grinding device, a groove grinding device, a thread grinding device, a relief grinding device and a finish grinding device, wherein the hydraulic rotary table is arranged in the center of the workbench, a first chuck component, a second chuck component, a third chuck component, a fourth chuck component, a fifth chuck component and a sixth chuck component are uniformly distributed on the hydraulic rotary table at intervals along the anticlockwise direction, the first chuck component, the second chuck component, the third chuck component, the fourth chuck component, the fifth chuck component and the sixth chuck component are all used for clamping a tap bar and driving the tap bar to rotate, a material rack is arranged on the upper side of the left rear part of the workbench corresponding to the position of the first chuck component, at least one transferring mechanism is arranged on the lower part of the material rack at intervals in the front and back direction, at least one material tray mechanism is arranged on the upper part of the material rack at intervals in the front and back direction, each transferring mechanism has the same structure as the material tray mechanism, a manipulator is arranged on the right side of the material rack, a laser marker is fixedly arranged at the tail end of the manipulator, a mechanical arm is arranged between the right side of the manipulator and the first chuck component, a clamping jaw mechanism capable of clamping two screw tap bar materials is fixedly arranged at the tail end of the mechanical arm, a grinding device for grinding the tail end of the screw tap bar and the outer side of the rough grinding screw tap bar is arranged on the upper side of the left front part of the workbench corresponding to the position of the second chuck component, a groove grinding device for grooving the outer side of the screw tap bar is arranged on the upper side of the front part of the workbench corresponding to the third chuck component, a thread grinding device for grinding threads on the outer side of the screw tap bar is arranged on the upper side of the right front part of the workbench corresponding to the position of the fourth chuck component, a relief grinding device for relief grinding the head of the screw tap bar stock is arranged at the upper side of the right rear part of the workbench corresponding to the fifth chuck component, and a fine grinding device for fine grinding the outer side of the screw tap bar is arranged on the upper side of the rear part of the workbench corresponding to the position of the sixth chuck component.

The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:

the clamping jaw mechanism can comprise a cylinder body, a front piston rod, a rear piston rod and a gripper, the right side of the cylinder body is fixedly installed with the tail end of the mechanical arm, the left side of the cylinder body is provided with a front piston chamber and a rear piston chamber at intervals from front to back, the center of the left side of the cylinder body corresponding to the position between the front piston chamber and the rear piston chamber is fixedly provided with the gripper, the front side and the rear side of the left end of the gripper are respectively fixedly provided with a front finger and a rear finger, the front piston rod with the left end sealed and penetrating through the left part of the front piston chamber is coaxially arranged in the front piston chamber, the left end of the front piston rod is provided with a V-shaped first clamping groove with a left opening, a front clamping block with a V-shaped structure with a left opening is arranged in the first clamping groove, the center of the left side of the front clamping block is provided with a front connecting hole which is communicated from left to right, the inner wall of the first clamping groove corresponding to the position of the front connecting hole is provided with a front fixing screw hole, a front connecting bolt with the right end screwed in the front fixing screw hole is arranged in the front connecting hole, the outer side of the right end of the front piston rod is fixedly provided with a front piston ring with the outer side of the front piston ring which is in sealed and contacted with the inner wall of the front piston chamber in the right end of the front piston rod, a rear piston rod with the left end passing through the left part of the rear piston chamber in a sealing way is coaxially arranged in the rear piston chamber, a V-shaped second clamping groove with the left opening is arranged at the left end of the rear piston rod, a rear clamping block with a V-shaped structure with the left opening is arranged in the second clamping groove, a rear connecting hole which is communicated with the left and the right is arranged in the center of the left side of the rear clamping block, a rear fixing screw hole is arranged on the inner wall of the second clamping groove corresponding to the position of the rear connecting hole, a rear connecting bolt with the right end screwed in the rear fixing screw hole is arranged in the rear connecting hole, a rear piston with the outer side in sealing contact with the inner wall of the rear piston chamber is fixed on the outer side of the right end of the rear piston rod, a front air hole and a rear air hole which are respectively communicated with the front piston chamber at the right side of the front piston ring and the rear piston chamber at the right side of the rear piston ring are arranged on the outer side of the right side of the rear piston rod, a front elastic reset piece is arranged between the outer side of the front piston rod corresponding to the left side of the front piston ring and the left part of the front piston chamber, a rear elastic reset piece is arranged between the outer side of the rear piston rod corresponding to the left side of the rear piston ring and the left part of the rear piston chamber.

The limiting hole before the bar that link up around above-mentioned preceding piston rod left part can be equipped with, the preceding mounting hole that link up around being equipped with is located to the cylinder body left part front side that corresponds preceding limiting hole position, fixed mounting has the preceding limiting pin that the middle part wore to locate in the preceding limiting hole in the preceding mounting hole, preceding elasticity resets the suit in the preceding piston rod outside between preceding piston ring left side and preceding limiting pin right side, the limiting hole behind the bar that link up around being equipped with of back piston rod left part, the cylinder body left part rear side that corresponds back limiting hole position is equipped with the back mounting hole of front end and preceding mounting hole rear end intercommunication, fixed mounting has the back limiting pin that the middle part wore to locate in the back mounting hole, back elasticity resets the suit in the back piston rod outside between piston ring left side and back limiting pin right side behind the piston ring.

The right side of the cylinder body corresponding to the position between the front piston chamber and the rear piston chamber can be provided with a front positioning hole and a rear positioning hole at intervals from front to back, the left end of the front positioning hole is communicated with the rear part of the front positioning hole, the left end of the rear positioning hole is communicated with the front part of the rear positioning hole, the rear part of the front limiting pin is uniformly provided with at least one front positioning groove with an outward opening at intervals along the circumference, a front positioning screw with the left end in contact with the bottom wall of one of the front positioning grooves is screwed in the front positioning hole, at least one rear positioning groove with an outward opening is uniformly distributed on the front part of the rear limiting pin along the circumference at intervals, and a rear positioning screw with the left end in contact with the bottom wall of one of the rear positioning grooves is screwed in the rear positioning hole.

The upper end of the hydraulic rotary table can be fixedly provided with a sealing cover with the upper end closed and the lower end opened, the upper end of the sealing cover is provided with an upper mounting through hole which is communicated up and down, the outer side of the middle part of the sealing cover is provided with a lower mounting through hole which corresponds to the first chuck component, the second chuck component, the third chuck component, the fourth chuck component, the fifth chuck component and the sixth chuck component, the structure of the first chuck component, the structure of the second chuck component, the structure of the third chuck component, the structure of the fourth chuck component, the structure of the fifth chuck component and the structure of the sixth chuck component are the same and are arranged in the lower mounting through holes at corresponding positions, the third chuck component comprises a chuck body, a tip, a chuck assembly, a main piston, an auxiliary piston and a driving device, the front part of the sealing cover is provided with the chuck body, the rear end of the chuck body is provided with a front-back communicated mounting channel, and the outer side of the tip is sleeved on the inner side of the front part of the chuck body, at least two guide holes which are radially communicated are uniformly distributed on the outer side of the rear part of the chuck body at intervals along the circumference, an auxiliary piston is arranged in each guide hole in a sealing and sliding manner, a reset elastic sheet corresponding to the auxiliary piston is fixedly arranged on the outer side of the rear end of the chuck body, a limiting groove with an outward opening is formed in the outer side of the chuck body corresponding to the position of each reset elastic sheet, a clamping jaw assembly with a rear end abutting against the position between the reset elastic sheet and the corresponding auxiliary piston is arranged in each limiting groove and comprises an adjusting jackscrew, a connecting plate and a clamping jaw, a connecting plate with a front part hinged and connected into the limiting groove corresponding to the position is arranged on the outer side of the chuck body corresponding to the position of each reset elastic sheet, an adjusting threaded through hole is formed in the rear end of the connecting plate, an adjusting jackscrew is screwed into the adjusting threaded through hole, a first adjusting through hole is formed in the front part of the reset elastic sheet corresponding to the position of the adjusting jackscrew, and a first adjusting through hole is formed in the inner end surface of the adjusting jackscrew and the outer end surface of the auxiliary piston corresponding position, and the outer end surface of the outer side of the connecting plate and the inner end of the reset elastic sheet corresponding position The side of the chuck body is balanced, the front part of the connecting plate is hinged with a clamping jaw of which the front end is positioned in front of the center, the right side of the rear part of the clamping jaw is provided with a left-right through-going fan-shaped second adjusting through hole, the connecting plate corresponding to the position of the second adjusting through hole is provided with a connecting through hole, the connecting plate sequentially penetrates through the connecting through hole and an adjusting bolt of which the left screw is connected with a nut through a screw end to be installed together, the front end of the clamping jaw is fixed with a clamping block close to the outer side of the front end of the center, a main piston capable of enabling all the front ends of the clamping jaws to be far away from or close to each other when the front and the back of the chuck body corresponding to the position of the center are installed in a sealing and sliding mode in the chuck body corresponding to the position of the rear side of the center, the upper side of the rear part of the hydraulic rotary table corresponding to the position of the chuck body is provided with a driving device capable of enabling the chuck body to rotate and the main piston to move back and forth, a tailstock corresponding to the tail tip is fixedly installed on the upper side of the front end of the tail frame corresponding to the center.

The outer side of the rear part of the chuck body can be uniformly provided with two guide holes which are symmetrically distributed up and down at intervals along the circumference, the front part of the main piston is provided with a first mounting hole which is through up and down, a wedge block with the rear part protruding out of the outer side of the main piston is fixedly mounted in the first mounting hole, the outer side of the upper part of the wedge block and the outer side of the lower part of the wedge block corresponding to the outer side of the main piston are respectively provided with a first cambered surface which contracts from back to front from outside to inside, the inner end surface of the auxiliary piston is provided with a second cambered surface matched with the first cambered surface, the front part of the wedge block is provided with a second mounting hole with left and right ends respectively extending to the outer side of the right part and the outer side of the left part of the main piston, the front end of the main piston is provided with a third mounting hole with the rear end communicated with the second mounting hole, a fixing pin is mounted in the second mounting hole, the outer side of the middle part of the fixing pin is provided with a fixing ring groove, and the third mounting hole is screwed with a fixing screw with which the rear end clamped in the fixing ring groove.

The driving device can comprise a connecting assembly, a mandrel, a slip ring, a shaft seat and a driving mechanism, wherein the rear end of a main piston is fixedly provided with a piston ring, the outer side of the piston ring is in sealing contact with the inner wall at the rear part of the mounting channel, the rear side of a chuck body is fixedly and hermetically arranged with the front side of the connecting assembly, the rear end of the connecting assembly is fixedly and hermetically arranged with the mandrel of a hollow structure, the outer side of the middle part of the mandrel is rotatably provided with the slip ring, the outer side of the slip ring is rotatably provided with the shaft seat fixedly arranged with a sealing cover, the rear end of the mandrel corresponding to the rear position of the shaft seat is in transmission connection with the front end of an output shaft of the driving mechanism fixedly arranged on the upper side of the rear part of the hydraulic turntable, the front and the rear of the outer side of the slip ring are distributed with an air inlet outer ring groove and an air outlet outer ring groove at intervals, the inner side of the rear part of the slip ring is provided with an air outlet inner ring groove corresponding to the air outlet outer ring groove, at least one first sealing element is arranged between the outer side of the slip ring and the inner side of the shaft seat at intervals in front of the outer air inlet ring groove, between the outer air inlet ring groove and the outer air outlet ring groove and in front of the outer air outlet ring groove, at least one second sealing element is arranged between the inner side of the slip ring and the outer side of the mandrel at intervals in front of the inner air inlet ring groove, at least one first air inlet hole communicated with the outer air inlet ring groove is arranged at the outer side of the rear part of the shaft seat, at least one second air inlet hole communicated with the bottom wall of the inner air inlet ring groove is arranged at intervals on the bottom wall of the outer air inlet ring groove, a third air inlet hole with one end communicated with the outer air inlet ring groove is arranged in the mandrel, the other end of the third air inlet hole extends to the front end face of the mandrel, a fourth air inlet hole with the rear end corresponding to the front end of the third air inlet hole is arranged at the rear side of the connecting assembly, and the other end of the fourth air inlet hole extends to the front end face close to the outer side, the chuck body is internally provided with a fifth air inlet hole with one end corresponding to the front end of the fourth air inlet hole, the other end of the fifth air inlet hole is communicated with the inner wall of the installation channel in front of the piston ring, the outer side of the front part of the shaft seat is provided with a first air outlet hole communicated with the air outlet outer ring groove, the air outlet outer ring groove bottom wall is provided with at least one second air outlet hole communicated with the air outlet inner ring groove bottom wall at intervals, the mandrel is internally provided with a third air outlet hole with one end communicated with the air outlet outer ring groove, the other end of the third air outlet hole extends to the front end face of the mandrel, the rear side of the connecting assembly is provided with a fourth air outlet hole which is through from front to back and the rear end of which corresponds to the front end of the third air outlet hole, and the front end of the fourth air outlet hole is communicated with the installation channel behind the piston ring.

The connecting component can comprise a first guide column, a first cover plate and a second cover plate which are fixedly and hermetically arranged together, the rear end of the chuck body and the front end of the first cover plate are fixedly and hermetically arranged together, at least one first guide groove with a forward opening is uniformly distributed at intervals along the circumference at the front end of the first cover plate corresponding to the position of the mounting channel, the rear end of the piston ring corresponding to the position of each first guide groove is provided with a second guide groove with a backward opening, a first guide post with the front part sleeved in the corresponding second guide groove is fixedly arranged in each first guide groove, a space is arranged between the front end of each first guide post and the bottom wall of the corresponding second guide groove, the front end of the mandrel is fixedly arranged with the rear end of the second cover plate, the fourth air inlet hole comprises a sixth air inlet hole and a seventh air inlet hole, a sixth air inlet hole which is communicated from front to back is arranged at the rear side of the second cover plate corresponding to the front position of the third air inlet hole, a seventh air inlet hole with one end corresponding to the sixth air inlet hole and the other end extending to the front end surface of the first cover plate close to the outer side is arranged at the rear end of the first cover plate, the fourth air outlet hole comprises a fifth air outlet hole and a sixth air outlet hole, a fifth air outlet hole which is communicated from front to back is arranged at the rear side of the second cover plate corresponding to the front position of the third air outlet hole, a sixth air outlet hole which is communicated with the front and the back is arranged at the back side of the first cover plate corresponding to the fifth air outlet hole, a back bearing and a front bearing are respectively arranged at the outer side of the mandrel corresponding to the back and the front of the slip ring and the inner side of the shaft seat, a first end cover is fixedly arranged at the rear end of the shaft seat corresponding to the rear position of the rear bearing, a first locking nut screwed on the outer side of the rear part of the mandrel is hermetically arranged at the inner side of the first end cover, a second end cover is fixedly arranged at the front end of the shaft seat corresponding to the front position of the front bearing, and a second locking nut screwed on the outer side of the front part of the mandrel is arranged on the inner side of the second end cover in a sealing manner.

The installation passageway that above-mentioned corresponds dabber the place ahead position can include by the back first straight hole section that communicates in proper order to the front, second straight hole section and taper hole section, the diameter of first straight hole section is greater than the diameter of second straight hole section, the diameter of second straight hole section is greater than the diameter of taper hole section rear end, the diameter of taper hole section rear end is less than the diameter of taper hole section front end, top rear portion outside is the conical surface with the anterior inner wall assorted of taper hole section, seal installation has floating piston in the second straight hole section, the anterior outside interval equipartition in the chuck body that corresponds position between top rear and the floating piston the place ahead has the fourth mounting hole of a plurality of and taper hole section rear portion intercommunication.

The charging tray mechanism can comprise a fixed seat, a charging tray and a guide assembly, the charging tray is arranged above the material rack, a plurality of fixed hole groups are uniformly distributed at intervals on the left and right of the charging tray upper side, each fixed hole group comprises a plurality of fixing through holes uniformly distributed at intervals on the front and back, a plurality of lightening grooves with the groove widths smaller than the diameters of the fixing through holes are uniformly distributed at intervals on the left and right of the charging tray lower side, each lower end of each fixing through hole is communicated with the lightening groove bottom wall of the corresponding position, a fixed seat fixedly installed with the material rack is arranged on the charging tray lower side, a plurality of guide assemblies are arranged at intervals between the fixed seat and the charging tray, each guide assembly comprises a guide pin, an elastic reset piece and a locking nut, at least two guide holes are uniformly distributed at intervals along the circumferential direction on the charging tray lower side, connecting holes which are vertically communicated are arranged on the upper side of the fixed seat corresponding to the positions of each guide hole, each connecting hole comprises a guide section and a connecting section, a locking nut is fixedly installed on the inner side of the lower part of the guide section, a guide pin with a guide pin, the upper end of which is slidably installed in the guide section, a tight transition surface between the guide pin and the upper end of the guide section of the guide pin, and the elastic reset piece which is tightly abutted against the upper end of the guide section.

Above-mentioned charging tray middle part front side and middle part rear side all can be equipped with the ascending first draw-in groove of opening, first draw-in groove left side inner wall and right side inner wall establish the arc surface to the bilateral symmetry, both sides all are fixed with the connecting block around the fixing base lower part that corresponds charging tray front side and rear side position, the connecting block upside is equipped with the compression screw, the spiro union has clamp bolt in the compression screw, clamp bolt upper portion fixed mounting has the fixed plate that the downside contacted with the first draw-in groove diapire that corresponds, charging tray middle part left side and middle part right side all are equipped with the second draw-in groove that the opening is decurrent, the arc surface to the longitudinal symmetry is established to second draw-in groove front side inner wall and rear side inner wall, fixing base middle part left side and middle part right side all are equipped with the third draw-in groove the same with second draw-in groove structure.

The fixing plate is a long circular plate, the upper side of the fixing plate can be provided with a vertically through mounting hole, the upper portion of the compression bolt is sleeved in the mounting hole, the side face of the fixing plate is provided with a fastening hole communicated with the mounting hole, and an anti-rotation screw is screwed in the fastening hole.

The square grinding device can comprise a square grinding driving mechanism, a square grinding wheel and a first cross sliding table, wherein the first cross sliding table with an X shaft or a Y shaft perpendicular to the central axis of the center of the second chuck assembly is fixedly arranged on the upper side of the left front part of the workbench, the square grinding driving mechanism is fixedly arranged at the upper end of the first cross sliding table, the square grinding wheel with the central axis parallel to the central axis of the center of the second chuck assembly is fixedly arranged on the outer side of the output shaft end part of the square grinding driving mechanism, the groove grinding device comprises a groove grinding driving mechanism, a groove grinding wheel and a first three-axis sliding table, the first three-axis sliding table with the X shaft or the Y shaft perpendicular to the central axis of the center of the third chuck assembly is fixedly arranged on the upper side of the front part of the workbench, a groove grinding driving mechanism is fixedly arranged on the rear side of the upper part of the first cross sliding table, the groove grinding wheel with the central axis perpendicular to the central axis of the center of the third chuck assembly is fixedly arranged on the outer side of the output shaft end part of the groove driving mechanism, the thread grinding device comprises a thread grinding driving mechanism, a thread grinding wheel, a second cross sliding table and a first dividing disc, wherein the upper side of the right front part of the workbench is fixedly provided with the second cross sliding table of which the X axis or the Y axis is vertical to the central axis of the center of the fourth chuck assembly, the upper side of the second cross sliding table is fixedly provided with the first dividing disc, the end surface of the first dividing disc is rotatably provided with the thread grinding driving mechanism, the outer side of the end part of an output shaft of the thread grinding driving mechanism is fixedly provided with the thread grinding wheel of which the central axis is parallel to the central axis of the center of the fourth chuck assembly, the relief grinding device comprises a relief grinding driving mechanism, a relief grinding wheel, a thirty sliding table and a second dividing disc, the upper side of the right rear part of the workbench is fixedly provided with the thirty sliding table of which the X axis or the Y axis is vertical to the central axis of the center of the fifth chuck assembly, the second dividing disc is fixedly arranged on the upper side of the thirty sliding table, the end face of the second dividing plate is rotatably provided with a relief grinding driving mechanism, the outer side of the end part of an output shaft of the relief grinding driving mechanism is fixedly provided with a relief grinding wheel with a central axis parallel to the central axis of the tip of the fifth chuck component, the fine grinding device comprises a fine grinding driving mechanism, a fine grinding wheel and a second three-axis sliding table, the upper side of the rear part of the workbench is fixedly provided with the second three-axis sliding table with an X axis or a Y axis perpendicular to the central axis of the tip of the sixth chuck component, the front side of the upper part of the second three-axis sliding table is fixedly provided with the fine grinding driving mechanism, and the outer side of the end part of the output shaft of the fine grinding driving mechanism is fixedly provided with the fine grinding wheel with a central axis perpendicular to the central axis of the tip of the sixth chuck component.

The second technical scheme of the invention is realized by the following measures: a tap machining method comprises the following steps:

step one, preparing materials, namely putting a material tray into which a screw tap bar is inserted into each fixing through hole, putting the material tray into a material rack, and fixedly installing the material tray and a fixing seat together;

secondly, material taking, wherein the mechanical arm rotates to enable the clamping jaw mechanism to rotate above the material tray and clamp a screw tap bar, and then the screw tap bar is placed into the first chuck component;

thirdly, a hydraulic rotary table drives a first chuck component which is clamped with a screw tap bar to rotate 60 degrees anticlockwise to a second chuck component position, the screw tap bar is rotated by the first chuck component, meanwhile, the tail of the screw tap bar is ground into a four-side square tail by a square grinding device, then the screw tap bar is taken out and placed into the first chuck component after the screw tap bar is turned off by the mechanical arm and a clamping jaw mechanism, and finally, a square grinding device performs rough grinding on the rod part of the screw tap bar;

fourthly, groove grinding, wherein the hydraulic rotary table drives the first chuck component clamping the screw tap bar to rotate anticlockwise by 60 degrees to the position of the third chuck component, the first chuck component rotates the screw tap bar, and the groove grinding device grinds a spiral groove on the rod part of the screw tap bar;

fifthly, grinding threads, wherein the hydraulic rotary table drives the first chuck assembly clamped with the screw tap bar to rotate 60 degrees anticlockwise to a fourth chuck assembly position, the first chuck assembly rotates the screw tap bar, and the thread grinding device grinds the threads on the rod part of the screw tap bar;

sixthly, relief grinding, wherein the hydraulic turntable drives the first chuck component clamping the screw tap bar to rotate anticlockwise by 60 degrees to a fifth chuck component position, the first chuck component rotates the screw tap bar, and the relief grinding device grinds the head of the screw tap bar;

seventhly, fine grinding, namely enabling a hydraulic turntable to drive a first chuck component clamping the screw tap bar to rotate anticlockwise by 60 degrees to a sixth chuck component position, enabling the first chuck component to rotate the screw tap bar, and simultaneously enabling a relief grinding device to perform fine grinding on the rod part of the screw tap bar;

and eighthly, storing materials, driving a first chuck component which clamps the screw tap bar materials to rotate anticlockwise by 60 degrees to an initial position by a hydraulic turntable, taking the ground screw tap bar materials down by a mechanical arm and a clamping jaw mechanism, detecting and identifying the ground screw tap bar materials by a laser marker, and finally inserting the ground screw tap bar materials into a fixed through hole of a material tray by the mechanical arm and the clamping jaw mechanism.

The invention has reasonable and compact structure, after the clamping jaw mechanism is connected with an air source or a hydraulic station, a screw tap bar is clamped by the rotation of the mechanical arm and then is transferred to the first chuck component, the first chuck component clamps the screw tap bar and then is rotated for six times by the hydraulic turntable, each time the screw tap bar is rotated for 60 degrees and then sequentially passes through the square grinding device, the groove grinding device, the thread grinding device, the relief grinding device and the fine grinding device, the screw tap bar is sequentially ground into a screw tap finished product after passing through the square grinding device, the rough grinding excircle, the slotting, the thread grinding, the relief grinding head and the fine grinding excircle, and through the arrangement, the high efficiency of the traditional machine tool and the high precision of a modern five-axis tool grinding machine can be inherited, multiple processes are integrated into one machine tool for simultaneous processing, each efficiency is obviously improved compared with the efficiency of the five-axis tool grinding machine, and through the arrangement of the fixing through holes, the tail ends of a plurality of screw taps can be inserted into the fixing through holes, so that the screw tap raw materials or products can be vertically placed, the gripping mechanism is convenient to grip, meanwhile, the arrangement can also increase the capacity of the material tray for placing screw taps, reduce the replacement times of the material tray, shorten the exchange time of the material tray, reduce the weight of the material tray through the arrangement of the weight reduction grooves, reduce the load of the material tray containing screw tap raw materials or finished products in the transferring process, reduce the labor intensity or driving capacity, save the production cost, ensure that the four-side tail ends of the screw taps can play a role in positioning after being inserted into the weight reduction grooves, facilitate the placement of the screw tap raw materials and the finished products, also facilitate the mechanical arm to control the repeated gripping or repeated placement of the gripping mechanism on the screw tap raw materials or the finished products of the screw taps, improve the reliability in the gripping process, also reduce the difficulty in positioning of the screw taps on the material tray 2, and flexibly control the gripping mechanism to take out the raw materials of the components of the gripping mechanism in sequence and place the raw materials into a processing station through the arrangement of the mechanical arm, and take down the processed finished products onto another material tray simultaneously, the turnover mechanism is arranged to buffer the material tray filled with finished products, so that the waiting time during feeding is saved, the machined finished products can be identified by arranging the mechanical arm and the laser marker, and the turnover mechanism has the characteristics of high productivity, small occupied area, simplicity in machining, short waiting time during feeding and discharging and low labor intensity.

Drawings

FIG. 1 is a schematic front view of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

FIG. 3 is a schematic top view of the present invention with the sealing cap removed.

FIG. 4 is a right-side sectional view of the chuck body of the present invention.

FIG. 5 is a schematic top sectional view of the chuck body of the present invention.

Fig. 6 is a schematic front view of a chuck body and a jaw assembly according to the present invention.

FIG. 7 is a schematic perspective view of a chuck body according to the present invention.

Fig. 8 is a schematic perspective view of a piston ring according to the present invention.

FIG. 9 is a perspective view of the wedge of the present invention.

Fig. 10 is a schematic perspective view of a first cover plate according to the present invention.

Fig. 11 is a rear sectional view of the first cover plate according to the present invention.

FIG. 12 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 11.

Fig. 13 is a schematic perspective view of a second cover plate according to the present invention.

Fig. 14 is a perspective view of the axle seat, chuck body and jaw assembly of the present invention when assembled.

Fig. 15 is a front view of the gripper mechanism of the present invention.

FIG. 16 is a schematic cross-sectional view taken at B-B in FIG. 15.

Fig. 17 is a perspective view of the gripper mechanism of the present invention.

Fig. 18 is a perspective view of a front locating pin according to the present invention.

FIG. 19 is a front view of the tray of the present invention.

FIG. 20 is a schematic cross-sectional view at C-C in FIG. 19.

FIG. 21 is a right sectional view of the tray of the present invention.

Fig. 22 is an enlarged schematic view of the structure at D in fig. 21.

FIG. 23 is a schematic view of a three-dimensional structure of a finished tap product manufactured according to the present invention.

The codes in the figures are respectively: 1 is a chuck body, 2 is a tip, 3 is a main piston, 4 is an auxiliary piston, 5 is a piston ring, 6 is a reset spring, 7 is a first cover plate, 8 is a second cover plate, 9 is a mandrel, 10 is a slip ring, 11 is a shaft seat, 13 is an adjusting bolt, 14 is a rear bearing, 15 is a front bearing, 16 is a first end cover, 17 is a second end cover, 18 is a first locking nut, 19 is a second locking nut, 20 is a locking ring, 21 is an adjusting jackscrew, 22 is a connecting plate, 23 is a clamping jaw, 24 is a wedge, 25 is a fixing pin, 26 is a fixing screw, 27 is a floating piston, 28 is a first sealing element, 29 is a second sealing element, 30 is an air inlet outer ring groove, 31 is an air inlet inner ring groove, 32 is an air outlet outer ring groove, 33 is an air outlet inner ring groove, 34 is a first air inlet hole, 35 is a second air inlet hole, 36 is a third air inlet hole, 37 is a fifth air inlet hole, 38 is a sixth air inlet hole, 39 is a seventh air inlet hole, 40 is a first outlet hole, 41 is a second outlet hole, 42 is a third outlet hole, 43 is a fifth outlet hole, 44 is a sixth outlet hole, 45 is a constant pressure outer ring groove, 46 is a constant pressure inner ring groove, 47 is a first constant pressure hole, 48 is a second constant pressure hole, 49 is a first regulation through hole, 50 is a second regulation through hole, 51 is a first straight hole section, 52 is a second straight hole section, 53 is a tapered hole section, 54 is a fourth mounting hole, 55 is a first arc surface, 56 is a second arc surface, 58 is a tail stock, 59 is a stopper groove, 60 is a stopper, 61 is a tail tip, 62 is a driving mechanism, 63 is a first guide groove, 64 is a second guide groove, 65 is a first guide post, 66 is an outer guide post, 67 is a cylinder body, 68 is a front piston rod, 69 is a rear piston rod, 70 is a gripper, 71 is a front finger, 72 is a rear finger, 73 is a front piston ring, 74 is a rear piston ring, 75 is a forward air hole, 76 is a rear air hole, 77 is a front clamping block, 78 is a rear clamping block, 79 is a front elastic reset piece, 80 is a rear elastic reset piece, 81 is a front connecting bolt, 82 is a rear connecting bolt, 83 is a front end cover, 84 is a rear end cover, 85 is a front limit hole, 86 is a rear limit hole, 87 is a front limit pin, 88 is a rear limit pin, 89 is a front limit groove, 90 is a fixing hole, 91 is a front limit screw, 92 is a rear limit screw, 93 is a sealing cover, 94 is a workbench, 95 is a hydraulic turntable, 96 is a mechanical arm, 97 is a first clamping head assembly, 98 is a second clamping head assembly, 99 is a fourth clamping head assembly, 100 is a fifth clamping head assembly, 101 is a sixth clamping head assembly, 102 is a first cross slide, 103 is a second cross slide, 104 is a thirty slide, 105 is a first three-axis slide, 106 is a second three-axis slide, 107 is a first index plate, 108 is a second dividing plate, 109 is a grinding square driving mechanism, 110 is a grinding groove driving mechanism, 111 is a grinding thread driving mechanism, 112 is a relief grinding driving mechanism, 113 is a fine grinding driving mechanism, 114 is a fixed seat, 115 is a material plate, 116 is a guide pin, 117 is a limit ring table, 118 is an elastic reset piece, 119 is a lock nut, 120 is a connecting block, 121 is a compression bolt, 122 is a fixed plate, 123 is an anti-rotation screw, 124 is a fixed through hole, 125 is a guide hole, 126 is a guide section, 127 is a connecting section, 128 is a transition surface, 129 is an upper mounting groove, 130 is a lower mounting groove, 131 is a communicating hole, 132 is a first clamping groove, 133 is a second clamping groove, 134 is a third clamping groove, 135 is an adjusting hole, 136 is a lightening groove, 137 is a manipulator, 138 is a material rest, 139 is a laser marker, and 140 is a turnover mechanism.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention is further described with reference to the following examples and figures:

the first embodiment is as follows: as shown in fig. 1 to 22, the tap machining center comprises a workbench 94, a material rack 138, a laser marker 139, a hydraulic turntable 95, a mechanical arm 96, a squaring device, a groove grinding device, a thread grinding device, a relief grinding device and a fine grinding device, wherein the hydraulic turntable 95 is arranged in the center of the workbench 94, a first chuck assembly 97, a second chuck assembly 98, a third chuck assembly, a fourth chuck assembly 99, a fifth chuck assembly 100 and a sixth chuck assembly 101 are uniformly distributed on the hydraulic turntable 95 at intervals along the counterclockwise direction, the first chuck assembly 97, the second chuck assembly 98, the third chuck assembly, the fourth chuck assembly 99, the fifth chuck assembly 100 and the sixth chuck assembly 101 are all used for clamping a bar tap and carrying the bar tap to rotate, a material rack 138 is arranged on the upper side of the left rear part of the workbench 94 corresponding to the position of the first chuck component 97, at least one turnover mechanism 140 is arranged on the lower part of the material rack 138 at intervals from front to back, a manipulator 137 is arranged on the right side of the material rack 138, a laser marker 139 is fixedly arranged at the tail end of the manipulator 137, a mechanical arm 96 is arranged between the right side of the manipulator 137 and the first chuck component 97, a clamping jaw mechanism capable of clamping two bars is fixedly arranged at the tail end of the mechanical arm 96, a grinding device for grinding the tail end of the tap rod and the outer side of the rough-ground tap rod is arranged at the upper side of the left front part of the workbench 94 corresponding to the position of the second chuck assembly 98, a groove grinding device for grooving the outer side of the screw tap bar is arranged on the upper side of the front part of the workbench 94 corresponding to the position of the third chuck component, a thread grinding device for grinding the thread on the outer side of the tap bar is arranged on the upper side of the right front part of the working table 94 corresponding to the position of the fourth chuck assembly 99, a relief grinding device for relief grinding the head of the tap bar stock is arranged on the upper side of the right rear part of the workbench 94 corresponding to the position of the fifth chuck assembly 100, the upper side of the rear portion of the table 94 corresponding to the position of the sixth chuck assembly 101 is provided with a finish grinding means for finish grinding the outer side of the tap bar.

According to requirements, the mechanical arm 96 is a conventional technology, such as a five-axis, six-axis or seven-axis mechanical arm, the hydraulic turntable 95 is a conventional technology, such as an HCT series tooth-type oil-pressure high-precision division rotary table with the division number of 6, the worktable 94 is a circular marble lathe bed, the mechanical arm 137 is a conventional three-coordinate mechanical arm 137, and the laser marker 139 is a conventional technology, the inner wall of the upper end of each fixing through hole 124 has a chamfer structure, and the distance between the centers of every two adjacent weight-reducing grooves 136 is the same as the distance between the center lines of every two adjacent fixing through holes 124 in the left-right direction. In the using process, after the clamping jaw mechanism is connected with an air source or a hydraulic station, a screw tap bar is clamped by the rotation of the mechanical arm 96 and then is transferred to the first chuck assembly 97, the first chuck assembly 97 clamps the screw tap bar and then is rotated for six times by the hydraulic turntable 95, the screw tap bar is rotated for 60 degrees each time and then sequentially passes through the square grinding device, the groove grinding device, the thread grinding device, the relief grinding device and the finish grinding device, the screw tap bar is sequentially ground into a screw tap finished product after passing through the square grinding device, the rough grinding excircle, the grooving, the grinding thread, the relief grinding head and the finish grinding excircle, through the arrangement, the high efficiency of the traditional machine tool and the high precision of the modern five-axis tool grinding machine can be inherited, multiple processes are integrated in one machine tool for simultaneous processing, the efficiency of each machine tool is obviously improved compared with the efficiency of a five-axis tool, and the tail ends of a plurality of screw taps can be inserted into the fixing through holes 124 through the fixing through holes 124, the screw tap raw materials or products are vertically placed, the gripping of the gripping mechanism is convenient, meanwhile, the capacity of placing screw taps on the material tray 115 can be increased, the replacement times of the material tray 115 are reduced, the exchange time of the material tray 115 is shortened, the weight of the material tray 115 can be reduced through the arrangement of the weight reduction groove 136, the load of the material tray 115 containing the screw tap raw materials or finished products in the transfer process is reduced, the labor intensity or the driving capability is reduced, the production cost is saved, the four-square tail end of the screw tap can be inserted into the weight reduction groove 136 to play a positioning role, the screw tap raw materials and finished products can be placed conveniently, the mechanical arm 96 is also convenient for controlling the gripping mechanism to repeatedly grip or repeatedly place the screw tap raw materials or finished products, the reliability in the gripping process is improved, the positioning difficulty of the screw tap on the material tray 115 is also reduced, and the gripping mechanism components can be flexibly controlled to be sequentially taken out and placed into a processing station through the arrangement of the mechanical arm 96, meanwhile, the processed finished product is taken down and placed on another material tray, the material tray filled with the finished product can be buffered by the aid of the turnover mechanism 140, waiting time during feeding is saved, and the processed finished product can be identified by the aid of the mechanical arm 137 and the laser marker 139. The invention has the characteristics of reasonable and compact structure, convenient use, high productivity, small occupied area, simple processing, short waiting time for feeding and discharging and low labor intensity.

The tap machining center can be further optimized or/and improved according to actual needs:

as shown in the attached figures 1, 2, 3, 15, 16 and 17, the gripper mechanism comprises a cylinder 67, a front piston rod 68, a rear piston rod 69 and a gripper 70, the right side of the cylinder 67 is fixedly mounted with the tail end of a mechanical arm 96, the left side of the cylinder 67 is provided with a front piston chamber and a rear piston chamber at intervals from front to rear, the center of the left side of the cylinder 67 corresponding to the position between the front piston chamber and the rear piston chamber is fixed with the gripper 70, the front side and the rear side of the left end of the gripper 70 are respectively fixed with a front finger 71 and a rear finger 72, the front piston rod 68 with the left end passing through the left part of the front piston chamber is coaxially arranged in the front piston chamber, the left end of the front piston rod 68 is provided with a V-shaped first gripper groove with a leftward opening, a front clamping block 77 with a leftward and leftward opening is arranged in the first gripper groove, the center of the left side of the front clamping block 77 is provided with a leftward and rightward through front connecting hole, the inner wall of the first gripper groove corresponding to the position of the front connecting hole is provided with a front fixing screw hole, a front connecting bolt 81 with the right end screwed in a front fixing screw hole is arranged in the front connecting hole, a front piston ring 73 with the outer side in sealing contact with the inner wall of the front piston chamber is fixed on the outer side of the right end of the front piston rod 68, a rear piston rod 69 with the left end sealed and penetrating through the left part of the rear piston chamber is coaxially arranged in the rear piston chamber, a V-shaped second clamping groove with the left opening is arranged at the left end of the rear piston rod 69, a rear clamping block 78 with the left opening and a V-shaped structure is arranged in the second clamping groove, a rear connecting hole which is communicated with the left and the right is arranged in the center of the left side of the rear clamping block 78, a rear fixing screw hole is arranged on the inner wall of the second clamping groove corresponding to the position of the rear connecting hole, a rear connecting bolt 82 with the right end screwed in the rear fixing screw hole is arranged in the rear connecting hole, a rear piston ring 74 with the outer side in sealing contact with the inner wall of the rear piston chamber is fixed on the outer side of the right end of the rear piston rod 69, a rear piston ring 74 is arranged on the outer side of the right part of the cylinder 67 at intervals, and a front piston chamber arranged on the right side of the front piston chamber 73 is arranged on the right part of the cylinder body, A front air hole 75 and a rear air hole 76 communicating with the rear piston chamber at a position to the right of the rear piston ring 74, a front elastic return member 79 provided between the outer side of the front piston rod 68 corresponding to a position to the left of the front piston ring 73 and the left of the front piston chamber, and a rear elastic return member 80 provided between the outer side of the rear piston rod 69 corresponding to a position to the left of the rear piston ring 74 and the left of the rear piston chamber.

According to requirements, a front end cover 83 is fixedly installed on the left side of a cylinder body 67 corresponding to the position of a front piston chamber, a front piston hole penetrating left and right is formed in the center of the front end cover 83, the outer side of the left portion of a front piston rod 68 is hermetically sleeved in the front piston hole, a rear end cover 84 is fixedly installed on the left side of the cylinder body 67 corresponding to the position of a rear piston chamber, a rear piston hole penetrating left and right is formed in the center of the rear end cover 84, the outer side of the left end of a rear piston rod 69 is hermetically sleeved in the rear piston hole, distances are respectively arranged between the left end of the front piston rod 68 and the right side of a front finger 71 and between the left end of the rear piston rod 69 and the right side of a rear finger 72, a front air hole 75 and a rear air hole 76 are both connected with an existing air source, a front elastic reset piece 79 and a rear elastic reset piece 80 are both in the prior art, such as compression springs, a first clamping groove and a second clamping groove can also be arc with openings facing left, the front piston rod 68 and the front piston ring 73 can be integrally arranged, the rear piston rod 69 and the rear piston ring 74 can be integrally arranged, and the front connecting hole and the rear connecting hole are both small step holes. In the using process, by arranging the first clamping groove and the second clamping groove, the front piston rod 68 and the rear piston rod 69 extend leftwards and then respectively clamp a screw tap bar or a finished product with the front finger 71 and the rear finger 72, then rotate to the processing station for installation, through two clamping stations formed by the front piston rod 68, the front finger 71, the rear piston rod 69 and the rear finger 72, the screw tap bar can be conveniently clamped and replaced with a subsequent processed finished product, then the processed finished product is withdrawn and placed in a tray, and a left screw tap bar needing to be processed is clamped, so that the time for clamping the screw tap bar and storing the finished product is shortened, the processing beat is compact, the clamping times are reduced, the clamping failure caused by positioning errors in the clamping process is reduced, and the failure rate is reduced, the reliability in the using process is improved, the front elastic reset piece 79 and the rear elastic reset piece 80 are arranged, a normal state of a distance can be kept between a piston rod and fingers, the grabbing of a screw tap bar is facilitated, the front clamping block 77 and the rear clamping block 78 are arranged, different front clamping blocks 77 and different rear clamping blocks 78 can be replaced according to the specification of the screw tap bar, the replacement time of screw tap bar clamps of different specifications is shortened, the production efficiency is improved, meanwhile, the contact area of the screw tap bar can be increased, the clamping process is more reliable, a guiding effect can be achieved when the front fingers 71 and the rear fingers 72 are inserted into the screw tap bar to be grabbed, the collision between the front fingers 71 and the screw tap bar due to positioning deviation is prevented, the reliability of the invention is improved, and chamfering structures are arranged on the left side of the front end of the front fingers 71 and on the left side of the rear end of the rear fingers 72.

As shown in fig. 1, 2, 3, 15, 16 and 17, a front limiting hole 85 is formed in the left portion of the front piston rod 68 and penetrates through the front and rear portions, a front mounting hole is formed in the front portion of the left portion of the cylinder 67 corresponding to the position of the front limiting hole 85 and penetrates through the front and rear portions, a front limiting pin 87 is fixedly mounted in the front mounting hole and penetrates through the front limiting hole 85 in the middle portion, a front elastic reset piece 79 is sleeved on the outer side of the front piston rod 68 between the left side of the front piston ring 73 and the right side of the front limiting pin 87, a rear limiting hole 86 is formed in the left portion of the rear piston rod 69 and penetrates through the front and rear portions, a rear mounting hole is formed in the rear portion of the left portion of the cylinder 67 corresponding to the position of the rear limiting hole 86 and penetrates through the rear end of the front mounting hole, a rear limiting pin 88 is fixedly mounted in the rear mounting hole and penetrates through the middle portion of the rear limiting hole 86, and a rear elastic reset piece 80 is sleeved on the outer side of the rear piston rod 69 between the left side of the rear piston ring 74 and the right side of the rear limiting pin 88.

In the use process, the limiting holes and the limiting pins are arranged to prevent the piston rods from rotating, and the front piston rods 68 and the rear piston rods 69 can be guided and supported in the left-right stretching process, and meanwhile, the left ends of the front elastic resetting pieces 79 and the rear elastic resetting pieces 80 are respectively spaced from the right sides of the front end cover 83 and the rear end cover 84 due to the arrangement of the limiting pins, so that the front elastic resetting pieces 79 and the rear elastic resetting pieces 80 are prevented from contacting and scratching the outer walls of the front piston rods 68 and the rear piston rods 69 in the compression process, the sealing performance between the front piston rods 68 and the front end cover 83 and between the rear piston rods 69 and the rear end cover 84 is reduced, and the service life of the invention is prolonged.

As shown in fig. 1, 2, 3, 17 and 18, a front positioning hole and a rear positioning hole are arranged on the right side of the cylinder 67 corresponding to the position between the front piston chamber and the rear piston chamber at intervals from front to back, the left end of the front positioning hole is communicated with the rear part of the front limiting hole 85, the left end of the rear positioning hole is communicated with the front part of the rear limiting hole 86, at least one front positioning groove 89 with an outward opening is circumferentially and uniformly distributed on the rear part of the front limiting pin 87 at intervals, a front positioning screw 91 with the left end contacting with the bottom wall of one front positioning groove 89 is screwed in the front positioning hole, at least one rear positioning groove with an outward opening is circumferentially and uniformly distributed on the front part of the rear limiting pin 88, and a rear positioning screw 92 with the left end contacting with the bottom wall of one rear positioning groove is screwed in the rear positioning hole.

In this embodiment, the number of the front positioning grooves 89 and the number of the rear positioning grooves are both two and are distributed in bilateral symmetry. In the use, through setting up preceding set screw 91 and back set screw 92, can play the positioning action to preceding spacer pin 87 and back spacer pin 88, prevent that elasticity from restoring to the throne the piece after a lot of effects, preceding spacer pin 87 and back spacer pin 88 take place to lose the phenomenon, and then make preceding piston rod 68 or back piston rod 69 not reset, influence subsequent clamp and get and the blowing operation, the dismouting of preceding spacer pin and back spacer pin 88 of still being convenient for of such setting simultaneously.

As shown in fig. 1 to 14, a sealing cover 93 with a closed upper end and an open lower end is fixedly installed at the upper end of the hydraulic rotating table 95, an upper installation through hole which is through from top to bottom is formed at the upper end of the sealing cover 93, lower installation through holes corresponding to a first chuck component 97, a second chuck component 98, a third chuck component, a fourth chuck component 99, a fifth chuck component 100 and a sixth chuck 101 are formed at the outer side of the middle of the sealing cover 93, the structure of the first chuck component 97, the structure of the second chuck component 98, the structure of the third chuck component, the structure of the fourth chuck component 99, the structure of the fifth chuck component 100 and the structure of the sixth chuck component 101 are all the same and are installed in the lower installation through holes at corresponding positions, the third chuck component comprises a chuck body 1, a tip 2, a chuck component, a chuck jaw assembly, a main piston 3, an auxiliary piston 4 and a driving device, the sealing cover 93 is provided with a chuck body 1, the rear end of the chuck body 1 is provided with a front-rear through installation channel, the outer side of the rear part of the centre 2 is sleeved on the inner side of the front part of the chuck body 1, the outer side of the rear part of the chuck body 1 is uniformly distributed with at least two guide holes which are radially through along the circumference at intervals, each guide hole is internally provided with an auxiliary piston 4 in a sealing and sliding way, the outer side of the rear end of the chuck body 1 is fixedly provided with a resetting elastic sheet 6 corresponding to the auxiliary piston 4, the outer side of the chuck body 1 corresponding to each resetting elastic sheet 6 is provided with a limiting groove 59 with an outward opening, each limiting groove 59 is internally provided with a clamping jaw component with the rear end tightly propped against the position between the resetting elastic sheet 6 and the corresponding auxiliary piston 4, the clamping jaw component comprises an adjusting jackscrew 21, a connecting plate 22 and a clamping jaw 23, the outer side of the chuck body 1 corresponding to each resetting elastic sheet 6 is provided with a connecting plate 22 with the front part hinged with the limiting groove 59 corresponding position, the rear end of the connecting plate 22 is provided with an adjusting screw thread through hole, an adjusting jackscrew 21 is screwed in the adjusting thread through hole, a first adjusting through hole 49 is arranged at the front part of the reset spring sheet 6 corresponding to the position of the adjusting jackscrew 21, the inner end surface of the adjusting jackscrew 21 is abutted against the outer end surface of the auxiliary piston 4 corresponding to the position and the outer side of the rear end of the connecting plate 22 is abutted against the inner side of the reset spring sheet 6 corresponding to the position, the front part of the connecting plate 22 is hinged with a clamping jaw 23 with the front end positioned in front of the centre 2, a fan-shaped annular second adjusting through hole 50 which is communicated with the left and the right is arranged at the right side of the rear part of the clamping jaw 23, a connecting through hole is arranged on the connecting plate 22 corresponding to the position of the second adjusting through hole 50, the connecting plate 22 is installed together through a screw rod end which sequentially penetrates through the connecting through hole and the adjusting bolt 13 which is screwed with a nut at the left of the second adjusting through hole 50, the front end of each jaw 23 is fixedly provided with a fixture block 60 close to the outer side of the front end of the tip 2, the inside of the chuck body 1 corresponding to the rear position of the tip 2 is hermetically and slidably provided with a main piston 3 which can enable the front ends of all the jaws 23 to be far away from or close to each other when moving back and forth, the upper side of the front part of the hydraulic rotary table 95 corresponding to the rear position of the chuck body 1 is provided with a driving device which can enable the chuck body 1 to rotate and the main piston 3 to move back and forth, the front side of the lower part of the sealing cover 93 corresponding to the lower position of the chuck body 1 is fixedly provided with a tail frame 58, and the upper side of the front end of the tail frame 58 corresponding to the front position of the tip 2 is fixedly provided with a tail tip 61 corresponding to the tip 2.

According to requirements, the centre 2 is a known prior art, the adjusting jackscrew 21 is a known prior art, and the central axis of the second adjusting through hole 50 is collinear with the hinge axis of the jaw 23. In the using process, the screw tap rod material processing device rotates to be matched with processing equipment to process the screw tap rod material, the driving device drives the main piston 3 to move backwards, so that the auxiliary pistons 4 are pushed into the guide holes by the inner sides of the rear ends of the jaw components, the openings among the front ends of all the jaw components are increased, one end of the screw tap rod material is put into the guide holes, meanwhile, the center of the rear end of the screw tap rod material is abutted against the front end of the center 2, the center 2 plays a centering role on the screw tap rod material, the main piston 3 moves forwards by controlling the driving device on the left, the auxiliary pistons 4 are pushed out of the guide holes by the main piston 3, the outer ends of the auxiliary pistons 4 abut against the inner sides of the rear ends of the jaw components, the opening of the front ends of the jaw components is reduced, the screw tap rod material is clamped on the left side, and each jaw component is hinged to the outer side of the chuck body 1, therefore, the front end of the jaw component can float according to different specifications of the screw tap bar or processing errors of the outer surface in the clamping process, and finally the screw tap bar is clamped under the action of the reset elastic sheet 6, so that the clamping position can be automatically adjusted, the over-positioning phenomenon of the jaw component is avoided, the high-precision clamping and positioning function of the screw tap bar is realized, the left-hand processing or secondary clamping is facilitated, the collision and clamping time in the clamping process can be reduced, the deviation of the connecting plate 22 in the rotating process along with the chuck body can be avoided by arranging the limiting groove 59, the screw tap bar is loosened, the stability in use of the screw tap device is enhanced, the failure rate is reduced, the installation and adjustment of the jaw component are facilitated, the multi-process sequential clamping of the screw tap bar can be realized by arranging the hydraulic rotary table 95 and the tail tip 61, the repeated positioning is avoided, and the processing quality of the screw tap bar is reduced by the positioning errors in the multiple clamping process, through setting up the adjusting jackscrew 21, can adjust the length that the adjusting jackscrew 21 stretches out the adjusting thread through-hole according to the specification of the shell fragment 6 that resets and the screw tap bar, realize that jack catch 23 carries out the clamping to the screw tap bar of different specifications, increase application scope. The front end of the clamping jaw 23 is fixedly provided with a clamping block 60 close to the outer side of the front end of the tip 2, the clamping block 60 is provided with a groove matched with a screw tap bar, the clamping degree is improved, the jackscrew 21 can be quickly adjusted and adjusted through the arrangement of the first adjusting through hole 49, the adjustment is convenient and quick, the opening size of the front end of all the clamping jaws 23 can be adjusted through the arrangement of the second adjusting through hole 50 in a sector ring shape, so that machined workpieces of different specifications can be clamped conveniently, and the application range of the invention is enlarged.

As shown in fig. 1, 2, 3, 4, 5, 9, and 12, two guide holes are uniformly distributed at intervals along the circumference at the outer side of the rear portion of the chuck body 1, a first mounting hole is formed in the front portion of the main piston 3, a wedge block 24 is fixedly mounted in the first mounting hole, the rear portion of the wedge block 24 protrudes out of the main piston 3, first arc surfaces 55 which shrink from the back to the front from the outside to the inside are respectively arranged on the outer sides of the upper portion and the lower portion of the wedge block 24 corresponding to the outer side of the main piston 3, a second arc surface 56 matched with the first arc surface 55 is arranged on the inner end surface of the auxiliary piston 4, second mounting holes are formed in the front portion of the wedge block 24, the left end and the right end of the wedge block respectively extend to the outer side and the outer side of the left portion of the main piston 3, a third mounting hole is formed in the front end of the main piston 3, a fixing pin 25 is mounted in the second mounting hole, a fixing ring groove is formed in the outer side of the middle portion of the fixing pin 25, and a fixing screw 26 is screwed in the third mounting hole, and the fixing screw is arranged in the fixing ring groove.

According to the demand, the third mounting hole is forward and backward setting. In the using process, the wedge block 24 is arranged, the processing of the first cambered surface 55 is facilitated, meanwhile, the opening size of the clamping jaw 23 can be quickly adjusted according to the specification of a screw tap rod, the second cambered surface 56 is arranged, the auxiliary piston 4 slowly extends or retracts, damage or service life shortening when the reset elastic sheet 6 is impacted is avoided, maintenance cost is increased, meanwhile, the arrangement of the first cambered surface 55 and the second cambered surface 56 enables the clamping jaw 23 to slowly clamp the screw tap rod, the surface of the screw tap rod is prevented from being damaged by clamping, and the clamping process can be more accurate.

As shown in fig. 1 to 5 and fig. 7 to 14, the driving device includes a connecting assembly, a mandrel 9, a slip ring 10, a shaft seat 11 and a driving mechanism 62, a piston ring 5 whose outer side is in sealing contact with the inner wall of the rear portion of the installation channel is fixed at the rear end of the main piston 3, the rear side of the chuck body 1 is fixedly and hermetically mounted with the front side of the connecting assembly, the rear end of the connecting assembly is fixedly mounted with the front end of the mandrel 9 with a hollow structure, the slip ring 10 is rotatably mounted at the outer side of the middle portion of the mandrel 9, the shaft seat 11 is rotatably mounted at the outer side of the slip ring 10 and fixedly mounted with a sealing cover, the rear end of the mandrel 9 corresponding to the rear position of the shaft seat 11 is in transmission connection with the front end of the output shaft of the driving mechanism 62 fixedly mounted at the upper side of the rear portion of the hydraulic turntable 95, the shaft seat 11 is rotatably mounted at the outer side of the slip ring 10, an air inlet outer ring groove 30 and an air outlet outer ring groove 32 are spaced from the front to the rear portion of the outer ring 10, an air inlet inner ring groove 31 corresponding to the air inlet outer ring groove 30 is provided at the inner side of the rear portion of the slip ring 10, an air outlet inner ring groove 33 corresponding to the air outlet outer ring groove 32 is arranged on the inner side of the front part of the sliding ring 10, at least one first sealing element 28 is arranged between the outer side of the sliding ring 10 and the inner side of the shaft seat 11 at intervals in the front-back direction corresponding to the rear part of the air inlet outer ring groove 30, between the air inlet outer ring groove 30 and the air outlet outer ring groove 32 and in the front part of the air outlet outer ring groove 32, at least one second sealing element 29 is arranged between the inner side of the sliding ring 10 and the outer side of the shaft seat 9 at intervals in the front-back direction corresponding to the rear part of the air inlet inner ring groove 31, between the air inlet inner ring groove 31 and the air outlet inner ring groove 33 and in the front part of the air outlet inner ring groove 33, at least one first air inlet hole 34 communicated with the air inlet outer ring groove 30 is arranged on the outer side of the bottom wall of the air inlet outer ring groove 30 at intervals, and a third air inlet hole 36 communicated with the air inlet outer ring groove 30 is arranged in the shaft seat 9, the other end of the third air inlet hole 36 extends to the front end face of the mandrel 9, a fourth air inlet hole with the rear end corresponding to the front end of the third air inlet hole 36 is arranged on the rear side of the connecting assembly, the other end of the fourth air inlet hole extends to the front end face of the connecting assembly close to the outer side, a fifth air inlet hole 37 with one end corresponding to the front end of the fourth air inlet hole is arranged in the chuck body 1, the other end of the fifth air inlet hole 37 is communicated with the inner wall of the installation channel in front of the piston ring 5, a first air outlet hole 40 communicated with the air outlet outer ring groove 32 is arranged on the outer side of the front portion of the shaft seat 11, at least one second air outlet hole 41 communicated with the bottom wall of the air outlet inner ring groove 33 is arranged on the bottom wall of the air outlet outer ring groove 32 at intervals, a third air outlet hole 42 with the air outlet outer ring groove 32 is arranged in the mandrel 9, the other end of the third air outlet hole 42 extends to the front end face of the mandrel 9, a fourth air outlet hole with the rear portion and the rear end corresponding to the front end of the third air outlet hole is communicated with the installation channel behind the piston ring 5.

According to the requirement, the rear end of the mandrel 9 is positioned behind the shaft seat 11, the driving mechanism 62 is a servo motor which is well known in the prior art, and the number of the second air inlet holes 35 and the number of the second air outlet holes 41 are both one first sealing element 28 and one second sealing element 29 which are well known in the prior art, such as O-shaped sealing rings. In the use process, through the arrangement of the air inlet hole and the air outlet hole, a left gas or liquid medium is injected into the first air outlet hole 40, the rear end face of the piston ring 5 can be pushed and pressed to move forwards, then the main piston 3 is driven to move forwards, and the main piston 3 ejects the auxiliary piston 4 out to enable the front end of the jaw assembly to be close to a left clamping screw tap bar; inject into gas or liquid medium left in 34 to first inlet port, can bulldoze piston ring 5 preceding terminal surface, make its rearward movement, drive main piston 3 rearward movement then, the shell fragment 6 that resets makes jack catch subassembly front end keep away from each other and loosen the screw tap bar, through the setting of sliding ring 10, can axle bed 11, dabber 9 and chuck body 1 do not influence the intercommunication of inlet port and venthole at rotatory in-process, be convenient for control main piston 3's back-and-forth movement, the controllability is good.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, the connecting assembly includes a first guide post 65, a first cover plate 7 and a second cover plate 8 which are sealed and fixed together, the rear end of the chuck body 1 is sealed and fixed together with the front end of the first cover plate 7, at least one first guide groove 63 with a forward opening is circumferentially and uniformly distributed at intervals on the front end of the first cover plate 7 corresponding to the installation channel position, a second guide groove 64 with a backward opening is arranged on the rear end of the piston ring 5 corresponding to each first guide groove 63, a first guide post 65 with a front outer side sleeved in the corresponding second guide groove 64 is fixedly arranged in each first guide groove 63, a gap is arranged between the front end of each first guide post 65 and the bottom wall of the corresponding second guide groove 64, the front end of the mandrel 9 is sealed and fixed together with the rear end of the second cover plate 8, the fourth air inlet hole includes a sixth air inlet hole 38 and a seventh air inlet hole 39, a sixth air inlet hole 38 which is through from front to back is arranged at the rear side of the second cover plate 8 corresponding to the front end position of the third air inlet hole 36, a seventh air inlet hole 39 with one end corresponding to the sixth air inlet hole 38 and the other end extending to the front end surface of the first cover plate 7 near the outer side is arranged at the rear end of the first cover plate 7, the fourth air outlet hole comprises a fifth air outlet hole 43 and a sixth air outlet hole 44, a fifth air outlet hole 43 which is through from front to back is arranged at the rear side of the second cover plate 8 corresponding to the front end position of the third air outlet hole 42, a sixth air outlet hole 44 which is through from front to back is arranged at the rear side of the first cover plate 7 corresponding to the position of the fifth air outlet hole 43, a rear bearing 14 and a front bearing 15 are respectively arranged at the outer side of the mandrel 9 corresponding to the rear and front positions of the slip ring 10 and the inner side of the mandrel base 11, a first end cover 16 is fixedly arranged at the rear end of the shaft base 11 corresponding to the rear position of the rear bearing 14, a first locking nut 18 which is screwed on the inner side of the first end cover 16 in a sealing way is arranged on the outer side of the mandrel 9, a second end cover 17 is fixedly arranged at the front end of the shaft seat 11 corresponding to the front position of the front bearing 15, and a second locking nut 19 screwed on the outer side of the front part of the mandrel 9 is hermetically arranged on the inner side of the second end cover 17.

According to the requirement, a space is arranged between the rear end of the piston ring 5 and the front end of the first cover plate 7, the sixth air outlet hole 44 is communicated with the installation channel behind the piston ring 5, the rear bearing 14 is the prior known technology, such as a double-row deep groove ball bearing, the front bearing 15 is the prior known technology, such as a double-row tapered roller bearing, and the inner side of the first end cover 16 and the first locking nut 18 and the inner side of the second end cover 17 and the second locking nut 19 are hermetically installed through the prior known framework oil seals. In the using process, the first cover plate 7 is arranged, the seventh air inlet 39 can be conveniently arranged, the seventh air inlet 39 can be Z-shaped, the processing is convenient, the radial section of the seventh air inlet 39 can extend to the outer side of the first cover plate 7, a sealing plug fixedly and hermetically arranged in the radial section of the seventh air inlet 39 is arranged on the outer side of the first cover plate 7, through the arrangement, gas or liquid injected into the first air inlet 34 on the shaft seat 11 can be introduced into the front side of the piston ring 5, the piston ring 5 is further pushed to move backwards, the arrangement of the first cover plate 7 and the second cover plate 8 is convenient for the sealing connection between the mandrel 9 and the chuck body 1 and the installation of the main piston 3, through the arrangement, the sealing performance between the mandrel 9 and a connecting piece of the mandrel 9 can be improved, through the arrangement of the first guide column 65, the piston ring 5 and the chuck body 1 can synchronously rotate, meanwhile, the straightness of the piston ring 5 during the back and forth movement can be ensured, the control is more accurate, and the clamping action is more accurate. The first guide post 65 may also be a spring, increasing the pressurization of the high pressure gas, providing a double protection effect, preventing the piston ring 5 from moving too fast to impact the chuck body 1. In the specific actual installation, according to the thrust requirement of difference, can increase or reduce the quantity of spring, but the thrust spring mounting hole does not reduce, and the hole that adds out is used as the gas storage chamber, has increased thrust spring intracavity gas storage volume, makes clamping-force increase volume further reduce.

As shown in fig. 4, 5, 7 and 12, the mounting channel corresponding to the front position of the mandrel 9 includes a first straight hole section 51, a second straight hole section 52 and a tapered hole section 53 which are sequentially communicated from back to front, the diameter of the first straight hole section 51 is greater than that of the second straight hole section 52, the diameter of the second straight hole section 52 is greater than that of the rear end of the tapered hole section 53, the diameter of the rear end of the tapered hole section 53 is less than that of the front end of the tapered hole section 53, the outer side of the rear part of the center 2 is a tapered surface matched with the inner wall of the front part of the tapered hole section 53, the floating piston 27 is hermetically mounted in the second straight hole section 52, and a plurality of fourth mounting holes 54 communicated with the rear part of the tapered hole section 53 are uniformly distributed at intervals on the outer side of the front part of the chuck body 1 corresponding to the position between the rear part of the center 2 and the front part of the floating piston 27.

According to requirements, the rear part of the mounting channel for sealing and mounting the main piston 3 and the piston ring 5 is communicated with the first straight hole section 51, the second straight hole section 52 and the taper hole section 53 to form the mounting channel, and the number of the fourth mounting holes 54 can be two. In the using process, the floating piston 27 and the fourth mounting hole 54 are arranged, so that the sealing between the rear side of the main piston 3 and the inner wall of the mounting channel is facilitated, and the mounting with the wedge block 24 is facilitated, because the backward movement of the main piston 3 is caused by the action of gas or fluid entering the mounting channel through the fifth air inlet hole 37 on the front end face of the piston ring 5, the floating piston 27 can maintain the sealing performance of the mounting channel between the piston ring 5 and the floating piston 27, the phenomenon that the main piston 3 suddenly moves to the left to drive the wedge block 24 to rapidly move backwards so that the auxiliary piston 4 is rapidly retracted to the left to collide with the outer side of the wedge block 24 is prevented, the failure rate is reduced, meanwhile, the main piston 3 can suck the floating piston 27, the floating piston 27 plays a suction role on the center 2, the center 2 and the clamping jaws 23 synchronously clamp a screw tap rod, and similarly, the main piston 3 moves forwards so that the screw tap center 2 and the clamping jaws 23 synchronously loosen the screw tap rod.

In order to facilitate transmission connection between the mandrel 9 and the driving shaft, the mandrel 9 and the driving shaft rotate synchronously, workpieces to be clamped are processed and clamped conveniently, the piston ring 5 can be guided and positioned, in the rotation process, the piston ring 5 and the chuck body 1 rotate relatively, clamping at a certain angle cannot be performed on a screw tap bar, at least one second guide column is uniformly distributed between the front end of the mandrel 9 and the rear end of the second cover plate 8 at intervals along the circumference, as shown in the attached drawings 4, 5, 8, 10, 12 and 13, a plurality of outer key grooves 66 are uniformly distributed at intervals along the circumference at the rear end of the mandrel 9, inner key grooves corresponding to the outer key grooves 66 are formed in an output shaft of the driving mechanism 62, the front end of the output shaft of the driving mechanism 62 is sleeved on the inner side of the rear end of the mandrel 9, a key strip clamped in the corresponding outer key groove 66 is installed in each inner key groove, a locking ring 20 is tightly sleeved on the outer side of the rear end of the mandrel 9, the locking ring 20 is a separation type optical axis fixing ring of the existing mandrel, at least one positioning pin is arranged between the front end of the second cover plate 9 and the rear side of the first cover plate 7, and at least one positioning pin is arranged between the first cover plate 5.

In order to counteract the axial force applied to the first sealing element 28 at the front side of the air inlet outer ring groove 30 and the second sealing element 29 at the front side of the air inlet inner ring groove 31 when injecting gas or liquid into the air inlet hole, and to counteract the axial force applied to the first sealing element 28 at the rear side of the air outlet outer ring groove 32 and the second sealing element 29 at the rear side of the air outlet inner ring groove 33 when injecting gas or liquid into the air outlet hole, so as to avoid the first sealing element 28 and the second sealing element 29 from being subjected to fatigue failure when being subjected to unidirectional axial force, shorten the service life of the first sealing element 28 and the second sealing element 29, and improve the clamping reliability of the invention, and at the same time, the arrangement enables the first sealing element 28 and the second sealing element 29 to be subjected to axial force which interacts with each other, and enhances the sealing effect of the first sealing element 28 and the second sealing element 29, as shown in fig. 4, 5, 7, 8, 10, 12, and 13, two first sealing members 28 are spaced front and back between the outer side of the slip ring 10 corresponding to the position between the air inlet outer ring groove 30 and the air outlet outer ring groove 32 and the inner side of the shaft seat 11, a constant pressure outer ring groove 45 between the two first sealing members 28 is disposed on the outer side of the shaft seat 9, a first constant pressure hole 47 communicating with the constant pressure outer ring groove 45 is disposed on the outer side of the shaft seat 11, two second sealing members 29 are spaced front and back between the inner side of the slip ring 10 corresponding to the position between the air inlet inner ring groove 31 and the air outlet inner ring groove 33 and the outer side of the shaft seat 9, a constant pressure inner ring groove 46 between the two second sealing members 29 is disposed on the inner side of the slip ring 10, and at least one second constant pressure hole 48 communicating with the bottom wall of the constant pressure inner ring groove 46 is disposed on the bottom wall of the constant pressure outer ring groove 45. According to the requirement, the bottom walls of the constant pressure outer ring groove 45 and the constant pressure inner ring groove 46 can not be communicated, and the outer side of the front end of the shaft seat 11 is fixedly provided with a connecting flange fixedly installed with the hydraulic rotary table 95.

As shown in the attached figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, at least one material tray mechanism is arranged on the upper portion of the material rack 138 at intervals in the front and back direction, each turnover mechanism 140 has the same structure with the material tray mechanism, the material tray mechanism comprises a fixed seat 114, a material tray 115 and guiding components, a material tray 115 is arranged above the material rack 138, a plurality of fixed hole groups are uniformly distributed on the left and right sides of the upper side of the material tray 115 at intervals, each fixed hole group comprises a plurality of fixed through holes 124 uniformly distributed in the front and back direction at intervals, a plurality of weight reducing grooves 136 with the groove width smaller than the diameter of the fixed through holes 124 in the front and back direction are uniformly distributed on the left and right sides of the lower side of the material tray 115, the lower end of each fixed through hole 124 is communicated with the bottom wall of the weight reducing groove 136 at the corresponding position, the fixed seat 114 fixedly arranged with the material rack 138 is arranged on the lower side of the material tray 115, a plurality of the guiding components are arranged between the fixed seat 114 and the material tray 115 at intervals, the guide assembly comprises a guide pin 116, an elastic reset piece 118 and a lock nut 119, at least two guide holes 125 are uniformly distributed on the lower side of the charging tray 115 at intervals along the circumferential direction, connecting holes which are vertically through are formed in the upper side of the fixing seat 114 corresponding to the positions of each guide hole 125, each connecting hole comprises a guide section 126 and a connecting section 127, the diameters of the guide sections are sequentially increased from top to bottom, the lock nut 119 is fixedly installed on the inner side of the lower portion of each connecting section 127, the guide pin 116, the upper end of which is sleeved in the guide hole 125 corresponding to the corresponding position, a guide surface which is small in top and large in bottom is arranged on the outer side of the upper end of the guide pin 116, a limit ring platform 117 is fixed on the outer side of the lower end of the guide pin 116, and the elastic reset piece 118, which enables the upper end of the limit ring platform 117 to be tightly abutted to a transition surface 128 between the guide sections 126 and the connecting sections 127, is arranged between the lower end of the guide pin 116 and the upper end of the lock nut 119.

According to the requirement, four guide holes 125 are uniformly distributed at intervals along the circumferential direction on the lower side of the tray 115, the elastic reset member 118 can be a conventional technique, such as a compression spring, the lock nut 119 can be screwed on the inner side of the lower part of the connecting section 127, and can also be integrally arranged with the fixed seat 114, the diameter of the guide hole 125 is smaller than that of the guide section 126 of the connecting hole, so that the guide effect of the guide pin 116 is improved, the tray 115 is quickly positioned on the fixed seat 114, the transition surface 128 is a conical surface or a stepped surface, and in this embodiment, the transition surface 128 is a conical surface. In the use, reset 118 through setting up the elasticity, when charging tray 115 is placed on fixing base 114, make uide pin 116 outstanding in fixing base 114 upside, placing of feeding tray 115 provides the reference, can also improve the flexibility ratio that uide pin 116 inserted in the guide hole 125, through setting up the spigot surface, the upper end of uide pin 116 embolias in the guide hole 125, can fix a position charging tray 115, can avoid charging tray mechanism repeated location getting or blowing in-process, shorten positioning time, improve and get material or blowing efficiency, setting up of transition surface 128 can prevent to reset 118 at the elasticity under, the whole guide section 126 that stretches out the connecting hole of uide pin 116, charging tray 115 can't realize high-efficient installation on fixing base 114, influence the process beat of screw tap.

As shown in the attached drawing 1, 2, 3, 19, 20, charging tray 115 middle part front side and middle part rear side all are equipped with the ascending first draw-in groove 132 of opening, the arc surface that sets up to the left and right symmetry is established to first draw-in groove 132 left side inner wall and right side inner wall, both sides all are fixed with connecting block 120 around the fixing base 114 lower part that corresponds charging tray 115 front side and rear position, connecting block 120 upside is equipped with the pressure screw, it has clamp bolt 121 to compress tightly the screw internal spiro union, clamp bolt 121 upper portion fixed mounting has the fixed plate 122 that the downside and the first draw-in groove 132 diapire that corresponds contacted, charging tray 115 middle part left side and middle part right side all are equipped with the second draw-in groove 133 that the opening is decurrent, the arc surface that sets up to the front and back symmetry is established to second draw-in groove 133 front side inner wall and rear side inner wall, fixing base 114 middle part left side and middle part right side all are equipped with the third draw-in groove 134 the same with second draw-in groove 133 structure.

According to the requirement, the pressing bolt 121 is a conventional art, such as an allen cap screw, the third engaging groove 134 and the second engaging groove 133 may be disposed in an up-down symmetrical manner, and the width of the third engaging groove 134 in the left-right direction may also be greater than the width of the second engaging groove 133 in the left-right direction. In the use, through such setting, can rotate clamp bolt 121, make fixed plate 122 remove down and compress tightly on first draw-in groove 132 diapire, the effect of fixed charging tray 115 has been played, through such setting, can be to the charging tray 115 quick fixation of multiple specification, the dismouting time of charging tray 115 has been shortened, through setting up second draw-in groove 133, the transport of charging tray 115 of being convenient for, the setting of third draw-in groove 134, make charging tray 115 place can play the effect of stepping down to handling tool when on fixing base 114, prevent to press from both sides when placing charging tray 115 on fixing base 114 and hinder the operation personnel, or the phenomenon that handling manipulator 137 can't be taken back after charging tray 115 places on fixing base 114.

As shown in fig. 1, 2, 3, 19 and 20, the fixing plate 122 is an oblong plate with a vertically through mounting hole on the upper side, the upper part of the hold-down bolt 121 is sleeved in the mounting hole, the side surface of the fixing plate 122 is provided with a fastening hole communicated with the mounting hole, and an anti-rotation screw 123 is screwed in the fastening hole.

In the use, when charging tray 115 sits in fixing base 114 top through the direction subassembly, can fix charging tray 115 through fixed plate 122, fixed plate 122 is the long circle board, can avoid compressing tightly the position processing deviation of screw, press fixed plate 122 rotatory back on the diapire of first draw-in groove 132 can fix charging tray 115, prevent changeing screw 123 through setting up, can fix fixed plate 122 after the location, prevent that fixed plate 122 rotatory back charging tray 115 is not hard up, and the operation is simple.

In order to facilitate the fixing of the fixing seat 114 on the rack 138 and to adjust the position of the fixing seat 114, as shown in fig. 1, 2 and 3, the upper left and the upper right of the connecting block 120 corresponding to the left and the right of the pressing screw hole are provided with elongated adjusting holes 135 penetrating up and down.

In order to facilitate the installation of the elastic reset piece 118, the elastic reset piece 118 can be restrained, the elastic reset piece 118 between the guide pin 116 and the lock nut 119 is prevented from swinging too much, the installation difficulty between the material tray 115 and the fixed seat 114 is increased, meanwhile, the phenomenon that the service life of the elastic reset piece 118 is shortened due to the fact that the elastic reset piece 118 swings too much can be avoided, and the failure rate and the maintenance cost are reduced. As shown in fig. 1, 2, 3, 19, 20, 21, and 22, an upper mounting groove 129 is formed in the center of the lower end of the guide pin 116, the upper portion of the elastic restoring member 118 is fitted in the upper mounting groove 129, a lower mounting groove 130 corresponding to the upper mounting groove 129 is formed in the upper end of the lock nut 119, the lower portion of the elastic restoring member 118 is fitted in the lower mounting groove 130, and a communication hole 131 is formed in the center of the upper end of the guide pin 116 to communicate with the upper mounting groove 129 for facilitating the processing of the upper mounting groove 129.

As shown in fig. 1, 2 and 3, the square grinding device comprises a square grinding driving mechanism 109, a square grinding wheel and a first cross sliding table 102, the first cross sliding table 102 with an X axis or a Y axis perpendicular to the central axis of the tip of the second cartridge assembly 98 is fixedly installed on the upper side of the left front portion of the worktable 94, the square grinding driving mechanism 109 is fixedly installed on the upper end of the first cross sliding table 102, the square grinding wheel with a central axis parallel to the central axis of the tip of the second cartridge assembly 98 is fixedly installed on the outer side of the end portion of the output shaft of the square grinding driving mechanism 109, the groove grinding device comprises a groove driving mechanism 110, a groove grinding wheel and a first three-axis sliding table 105, the X axis or the Y axis perpendicular to the central axis of the third cartridge assembly is fixedly installed on the upper side of the worktable 94, a groove grinding driving mechanism 110 is fixedly installed on the rear side of the upper portion of the first cross sliding table 102, a groove grinding wheel with a central axis perpendicular to the central axis of the third cartridge assembly is fixedly installed on the outer side of the output shaft of the groove driving mechanism 110, the thread grinding device comprises a thread grinding driving mechanism 111, a thread grinding wheel, a second cross sliding table 103 and a first dividing disc 107, the upper side of the right front part of the workbench 94 is fixedly provided with the second cross sliding table 103 of which the X axis or the Y axis is vertical to the central axis of the center of the fourth chuck assembly 99, the upper side of the second cross sliding table 103 is fixedly provided with the first dividing disc 107, the end face of the first dividing disc 107 is rotatably provided with the thread grinding driving mechanism 111, the outer side of the output shaft end part of the thread grinding driving mechanism 111 is fixedly provided with the thread grinding wheel of which the central axis is parallel to the central axis of the center of the fourth chuck assembly 99, the relief grinding device comprises a relief grinding driving mechanism 112, a relief grinding wheel, a thirty sliding table 104 and a second dividing disc 108, the upper side of the right rear part of the workbench 94 is fixedly provided with the thirty sliding table 104 of which the X axis or the Y axis is vertical to the central axis of the fifth chuck assembly 100, a second dividing plate 108 is fixedly installed on the upper side of the thirty-shaped sliding table 104, a relief grinding driving mechanism 112 is rotatably installed on the end face of the second dividing plate 108, a relief grinding wheel with a central axis parallel to the central axis of the tip of the fifth chuck assembly 100 is fixedly installed on the outer side of the end portion of an output shaft of the relief grinding driving mechanism 112, the fine grinding device comprises a fine grinding driving mechanism 113, a fine grinding wheel and a second three-shaft sliding table 106, a second three-shaft sliding table 106 with an X shaft or a Y shaft perpendicular to the central axis of the tip of the sixth chuck assembly 101 is fixedly installed on the upper side of the rear portion of the workbench 94, a fine grinding driving mechanism 113 is fixedly installed on the front side of the upper portion of the second three-shaft sliding table 106, and a fine grinding wheel with a central axis perpendicular to the central axis of the tip of the sixth chuck assembly 101 is fixedly installed on the outer side of the end portion of the output shaft of the fine grinding driving mechanism 113.

According to requirements, the electric main shafts of the grinding square driving mechanism 109, the grinding groove driving mechanism 110, the grinding thread driving mechanism 111, the relief grinding driving mechanism 112 and the finish grinding driving mechanism 113 are all well-known electric main shafts, and the first cross sliding table 102, the second cross sliding table 103, the third cross sliding table 104, the first three-shaft sliding table 105, the second three-shaft sliding table 106, the first indexing disc 107 and the second indexing disc 108 are all well-known in the prior art. In the using process, the first cross sliding table 102 can drive the grinding driving mechanism 109 to drive the grinding wheel to grind the tail part of the screw tap rod to form a four-sided square tail, meanwhile, the outer side of the screw tap rod is roughly ground, the first three-axis sliding table 105 can drive the grinding groove driving mechanism 110 to drive the grinding groove grinding wheel and match with the rotation of the chuck component, the head part of the screw tap rod subjected to rough grinding is ground into a spiral groove, the second cross sliding table 103 and the first dividing disc 107 drive the grinding thread driving mechanism 111 to drive the grinding thread grinding wheel and match with the rotation of the chuck component, the screw tap rod with the grooved head part is ground to generate a thread, the third cross sliding table 104 and the second dividing disc 108 drive the relief grinding driving mechanism 112 to drive the relief grinding wheel and match with the rotation of the chuck component, the head part of the screw tap rod generating the thread is relief ground, the second three-axis sliding table 106 drives the driving mechanism 113 to drive the relief grinding mechanism to finally correct the screw tap rod with the relieved and ground, the processing technology of the screw tap rod is concentrated on one piece equipment, namely, the production efficiency is improved, and the land occupation area is increased, and the benefit of a fine grinding enterprise is saved.

Example two: as shown in fig. 1 to 23, a tap manufacturing method includes the steps of:

firstly, preparing materials, namely putting a material tray 115 into which a tap bar is inserted in each fixing through hole 124 into a material rack 138 and fixedly installing the material tray and the fixing seat 114 together;

secondly, material taking, namely, rotating the mechanical arm 96 to enable the clamping jaw mechanism to rotate to the position above the material tray 115 and clamp a tap bar, and then putting the tap bar into the first clamping head assembly 97;

thirdly, a hydraulic rotary table 95 drives a first chuck component 97 which clamps the screw tap bar to rotate 60 degrees anticlockwise to a position of a second chuck component 98, the first chuck component 97 rotates the screw tap bar, meanwhile, a squaring device grinds the tail of the screw tap bar into a four-sided square tail, then a mechanical arm 96 and a clamping jaw mechanism act to take out the screw tap bar and put the screw tap bar into the first chuck component 97 after the turning direction is removed, and finally, the squaring device roughly grinds the rod part of the screw tap bar;

fourthly, groove grinding is carried out, the hydraulic rotary table 95 drives the first chuck assembly 97 which is clamped with the screw tap bar to rotate 60 degrees anticlockwise to reach a third chuck assembly position, the first chuck assembly 97 rotates the screw tap bar, and meanwhile the groove grinding device grinds a spiral groove on the rod portion of the screw tap bar;

fifthly, grinding threads, wherein the hydraulic rotary table 95 drives the first chuck assembly 97 clamped with the screw tap bar to rotate anticlockwise for 60 degrees to a fourth chuck assembly 99 position, the first chuck assembly 97 rotates the screw tap bar, and the thread grinding device grinds threads on the rod part of the screw tap bar;

sixthly, relief grinding, wherein the hydraulic turntable 95 drives the first chuck component 97 which clamps the screw tap bar to rotate anticlockwise by 60 degrees to the position of the fifth chuck component 100, the first chuck component 97 rotates the screw tap bar, and the relief grinding device grinds the head of the screw tap bar;

seventhly, fine grinding is carried out, the hydraulic rotary table 95 drives the first chuck assembly 97 which is clamped with the tap bar to rotate anticlockwise for 60 degrees to the position of the sixth chuck assembly 101, the first chuck assembly 97 rotates the tap bar, and meanwhile, the relief grinding device carries out fine grinding on the rod part of the tap bar;

and eighthly, storing materials, driving the first chuck component 97 which clamps the screw tap bar materials to rotate 60 degrees anticlockwise to an initial position by the hydraulic turntable 95, taking the ground screw tap bar materials down by the mechanical arm 96 and the clamping jaw mechanism, detecting and marking the ground screw tap bar materials by the laser marker 139, and finally inserting the ground screw tap bar materials into the fixing through holes 124 of the material tray by the mechanical arm 96 and the clamping jaw mechanism.

In the first step, a full material tray 115 filled with tap bar stock and an empty material tray 115 are placed on a material rack 138, the full material tray 115 is used for feeding, the empty material tray 115 is used for placing a finished tap product, two turnover mechanisms 140 (full material trays) can be placed on the lower portion of the material rack 138 to shorten the time for replacing the material tray, in the third step, the first chuck assembly 97 rotates 60 degrees anticlockwise to the position of the second chuck assembly 98, meanwhile, the sixth chuck assembly 101 rotates 60 degrees anticlockwise to the position of the first chuck assembly 97, the second step is repeated, in the fifth step, the fourth chuck assembly 99, the third chuck assembly and the second chuck assembly 98 respectively rotate to the position of the first chuck assembly 97, the second step is repeated, in the eighth step, the clamping jaw mechanism firstly takes off and clamps the processed bar stock, then the clamped bar stock is placed into the first chuck assembly 97, one end of the tap bar stock is clamped by a tip 2 and a clamping jaw 23, the other end of the tap bar stock is pressed by a tail tip 61, the processing efficiency is high, the process is simple, and the quality of the finished tap bar is further improved.

The technical feature groups form various embodiments of the invention, and the invention has strong adaptability and implementation effect, and can increase or decrease unnecessary technical features according to actual needs to meet the requirements of different situations.

Claims

1. A tap machining center is characterized by comprising a workbench, a material rack, a laser marking device, a hydraulic rotary table, a mechanical arm, a square grinding device, a groove grinding device, a thread grinding device, a relief grinding device and a finish grinding device, wherein the hydraulic rotary table is arranged in the center of the workbench, a first chuck component, a second chuck component, a third chuck component, a fourth chuck component, a fifth chuck component and a sixth chuck component are uniformly distributed on the hydraulic rotary table at intervals along the anticlockwise direction, the first chuck component, the second chuck component, the third chuck component, the fourth chuck component, the fifth chuck component and the sixth chuck component are all used for clamping a tap bar and bring the tap bar to rotate, a material rack is arranged on the upper side of the left rear part of the workbench corresponding to the position of the first chuck component, at least one turnover mechanism is arranged on the lower part of the material rack at intervals in the front and back, at least one material tray mechanism is arranged on the upper part of the material rack at intervals in the front and back, each turnover mechanism has the same structure with the material tray mechanism, a manipulator is arranged on the right side of the material rack, a laser marker is fixedly arranged at the tail end of the manipulator, a mechanical arm is arranged between the right side of the manipulator and the first chuck component, a clamping jaw mechanism capable of clamping two screw tap bars is fixedly arranged at the tail end of the mechanical arm, a grinding device for grinding the tail end of the screw tap bar and the outer side of the rough grinding screw tap bar is arranged on the upper side of the left front part of the workbench corresponding to the position of the second chuck component, a groove grinding device for grooving the outer side of the screw tap bar is arranged on the upper side of the front part of the workbench corresponding to the third chuck component, a thread grinding device for grinding threads on the outer side of the screw tap bar is arranged on the upper side of the right front part of the workbench corresponding to the position of the fourth chuck component, a relief grinding device for relief grinding the head of the screw tap bar is arranged at the upper side of the right rear part of the workbench corresponding to the position of the fifth chuck component, a fine grinding device for finely grinding the outer side of the screw tap bar is arranged on the upper side of the rear part of the workbench corresponding to the position of the sixth chuck component; the clamping jaw mechanism comprises a cylinder body, a front piston rod, a rear piston rod and a gripper, the right side of the cylinder body is fixedly installed with the tail end of the mechanical arm, the left side of the cylinder body is provided with a front piston chamber and a rear piston chamber at intervals from front to back, the center of the left side of the cylinder body corresponding to the position between the front piston chamber and the rear piston chamber is fixedly provided with the gripper, the front side and the rear side of the left end of the gripper are respectively fixedly provided with a front finger and a rear finger, the front piston rod with the left end penetrating through the left part of the front piston chamber in a sealing way is coaxially arranged in the front piston chamber, the left end of the front piston rod is provided with a V-shaped first clamping groove with a left opening, a front clamping block with a V-shaped structure with a left opening is arranged in the first clamping groove, the center of the left side of the front clamping block is provided with a front connecting hole which is communicated with the left and the right, the inner wall of the first clamping groove corresponding to the position of the front connecting hole is provided with a front fixing screw hole, a front connecting bolt with the right end screwed in the front fixing screw hole is arranged in the front connecting hole, the outer side of the front piston rod is fixedly provided with a front piston ring which is in a sealing contact with the inner wall of the front piston chamber, a rear piston rod with the left end passing through the left part of the rear piston chamber in a sealing way is coaxially arranged in the rear piston chamber, a V-shaped second clamping groove with the left opening is arranged at the left end of the rear piston rod, a rear clamping block with the left opening and a V-shaped structure is arranged in the second clamping groove, a rear connecting hole which is communicated with the left and the right is arranged in the center of the left side of the rear clamping block, a rear fixing screw hole is arranged on the inner wall of the second clamping groove corresponding to the position of the rear connecting hole, a rear connecting bolt with the right end screwed in the rear fixing screw hole is arranged in the rear connecting hole, a rear piston ring with the outer side in sealing contact with the inner wall of the rear piston chamber is fixed on the outer side of the right end of the rear piston rod, a front air hole and a rear air hole which are respectively communicated with the front piston chamber at the right side of the front piston ring and the rear piston chamber at the right side of the rear piston ring are arranged at intervals, and a front elastic reset piece is arranged between the outer side of the front piston rod corresponding to the left side of the front piston ring and the left of the front piston chamber, a rear elastic reset piece is arranged between the outer side of the rear piston rod corresponding to the left side position of the rear piston ring and the left part of the rear piston chamber.

2. The tap machining center according to claim 1, wherein a front rod left portion is provided with a front limiting hole which is through in the front-rear direction, a front mounting hole which is through in the front-rear direction is provided on the front side of the left portion of the cylinder body corresponding to the position of the front limiting hole, a front limiting pin which is through in the front limiting hole is fixedly mounted in the front mounting hole, a front elastic reset piece is sleeved on the outer side of the front rod between the left side of the front piston ring and the right side of the front limiting pin, a rear rod left portion is provided with a rear limiting hole which is through in the front-rear direction, a rear mounting hole which is through in the front end and the rear end of the front mounting hole is provided on the rear side of the left portion of the cylinder body corresponding to the position of the rear limiting hole, a rear limiting pin which is through in the middle portion in the rear limiting hole is fixedly mounted in the rear mounting hole, and a rear elastic reset piece is sleeved on the outer side of the rear rod between the left side of the rear piston ring and the right side of the rear limiting pin; the right side of the cylinder body corresponding to the position between the front piston chamber and the rear piston chamber is provided with a front positioning hole and a rear positioning hole at intervals from front to back, the left end of the front positioning hole is communicated with the rear part of the front positioning hole, the left end of the rear positioning hole is communicated with the front part of the rear positioning hole, the rear part of the front limiting pin is uniformly provided with at least one front positioning groove with an outward opening at intervals along the circumference, a front positioning screw with a left end contacted with the bottom wall of one of the front positioning grooves is screwed in the front positioning hole, at least one rear positioning groove with an outward opening is uniformly distributed at intervals along the circumference at the front part of the rear limiting pin, and a rear positioning screw with a left end contacted with the bottom wall of one of the rear positioning grooves is screwed in the rear positioning hole.

3. The tap machining center according to claim 1 or 2, wherein a sealing cover with a closed upper end and an open lower end is fixedly mounted at the upper end of the hydraulic rotary table, an upper mounting through hole which is vertically communicated is formed at the upper end of the sealing cover, lower mounting through holes which correspond to the first chuck assembly, the second chuck assembly, the third chuck assembly, the fourth chuck assembly, the fifth chuck assembly and the sixth chuck assembly are formed in the outer side of the middle of the sealing cover, the structure of the first chuck assembly, the structure of the second chuck assembly, the structure of the third chuck assembly, the structure of the fourth chuck assembly, the structure of the fifth chuck assembly and the structure of the sixth chuck assembly are identical and are mounted in the lower mounting through holes at corresponding positions, the third chuck assembly comprises a chuck body, a tip, a chuck assembly, a main piston, an auxiliary piston and a driving device, a chuck body is arranged in front of the sealing cover, and a mounting channel which is vertically communicated is formed at the rear end of the chuck body, the outer side of the rear part of the centre is sleeved on the inner side of the front part of the chuck body, at least two guide holes which are radially communicated are uniformly distributed on the outer side of the rear part of the chuck body at intervals along the circumference, an auxiliary piston is hermetically and slidably arranged in each guide hole, a reset spring sheet corresponding to the auxiliary piston is fixedly arranged on the outer side of the rear end of the chuck body, a limiting groove with an outward opening is arranged on the outer side of the chuck body corresponding to the position of each reset spring sheet, a clamping jaw assembly with a rear end tightly propped between the reset spring sheet and the corresponding auxiliary piston is arranged in each limiting groove, each clamping jaw assembly comprises an adjusting jackscrew, a connecting plate and a clamping jaw, a connecting plate with a front part hinged and connected in the limiting groove corresponding to the position is arranged on the outer side of the chuck body corresponding to the position of each reset spring sheet, an adjusting threaded through hole is arranged at the rear end of the connecting plate, an adjusting jackscrew is screwed in the adjusting threaded through hole, and a first adjusting through hole is arranged on the front part of the reset spring sheet corresponding to the position of the adjusting jackscrew, the inner end face of the adjusting jackscrew is abutted against the outer end face of the auxiliary piston at a corresponding position and the outer side of the rear end of the connecting plate are abutted against the inner side of the reset elastic sheet at a corresponding position, the front part of the connecting plate is hinged with a clamping jaw of which the front end is positioned in front of the top, the right side of the rear part of the clamping jaw is provided with a left-right through-hole fan-shaped second adjusting through hole, the connecting plate corresponding to the position of the second adjusting through hole is provided with a connecting through hole, the connecting plate sequentially penetrates through the connecting through hole and an adjusting bolt of which the nut is screwed in the left side of the second adjusting through hole, the front end of the clamping jaw is fixedly provided with a clamping block close to the outer side of the front end of the top, a main piston capable of making all the front ends of the clamping jaws far away from or close to each other during forward and backward movement is arranged in the clamping chuck body in a sealing and sliding mode, the upper side of the rear part of the hydraulic rotary table corresponding to the rear side of the clamping chuck body is provided with a driving device capable of making the chuck body rotate and the main piston move backward and the tail holder is fixedly arranged on the upper side of the front end of the sealing cover lower part corresponding to the clamping chuck body; two guide holes which are symmetrically distributed up and down are uniformly distributed at intervals along the circumference on the outer side of the rear part of the chuck body, a first mounting hole which is through up and down is arranged at the front part of the main piston, a wedge block with the rear part protruding out of the outer side of the main piston is fixedly mounted in the first mounting hole, a first cambered surface which contracts from the back to the front from the outside to the inside is arranged on the outer side of the upper part and the outer side of the lower part of the wedge block corresponding to the outer side of the main piston, a second cambered surface matched with the first cambered surface is arranged on the inner end surface of the auxiliary piston, a second mounting hole with the left end extending to the outer side of the right part and the outer side of the left part of the main piston respectively is arranged on the front part of the wedge block, a third mounting hole with the rear end communicated with the second mounting hole is arranged on the front end of the main piston, a fixing pin is mounted in the second mounting hole, a fixing ring groove is arranged on the outer side of the middle part of the fixing pin, and a fixing screw joint in the third mounting hole is provided with a fixing screw in the fixing ring groove.

4. The tap machining center according to claim 3, wherein the driving device comprises a connecting assembly, a mandrel, a slip ring, a shaft seat and a driving mechanism, a piston ring having an outer side in sealing contact with an inner wall of a rear portion of the installation passage is fixed to a rear side of the main piston, a rear side of the chuck body is fixed to a front side of the connecting assembly in a sealing manner, a rear end of the connecting assembly is fixed to a front end of the mandrel of the hollow structure, a slip ring is rotatably mounted to an outer side of a middle portion of the mandrel, a shaft seat fixedly mounted to a seal cover is rotatably mounted to an outer side of the slip ring, a rear end of the mandrel corresponding to a rear portion of the shaft seat is connected to a front end of an output shaft of the driving mechanism fixedly mounted to an upper side of a rear portion of the hydraulic rotary table, outer air inlet grooves and outer air outlet grooves are arranged at intervals around an outer side of the slip ring, an inner air inlet inner ring groove corresponding to the air inlet outer ring groove is arranged on an inner side of the rear portion of the slip ring, an inner side of the outer inlet ring corresponding to an inner ring groove corresponding to an air outlet groove, at least one first sealing element is arranged at intervals around an air inlet hole formed in the outer ring groove, at least one third sealing element is arranged in a position corresponding to the inner ring groove, a front of the outer ring, a front portion of the inner ring groove, a third sealing element is arranged in a position of the inner ring, a rear portion of the outer ring groove, and a third sealing element, a third sealing element is arranged in a rear portion of the inner ring, and a third sealing element is arranged in a rear portion of the inner ring, a third sealing element, and a third sealing element is arranged in a rear portion of the inner ring, and a third sealing element are arranged in a third sealing element, the other end of the fourth air inlet hole extends to the front end face, close to the outer side, of the connecting assembly, a fifth air inlet hole with one end corresponding to the front end of the fourth air inlet hole is arranged in the chuck body, the other end of the fifth air inlet hole is communicated with the inner wall of the mounting channel in front of the piston ring, a first air outlet hole communicated with the air outlet outer ring groove is arranged on the outer side of the front portion of the shaft seat, at least one second air outlet hole communicated with the bottom wall of the air outlet inner ring groove is arranged on the bottom wall of the air outlet outer ring groove at intervals, a third air outlet hole with one end communicated with the air outlet outer ring groove is arranged in the mandrel, the other end of the third air outlet hole extends to the front end face of the mandrel, a fourth air outlet hole which is communicated with the front and the rear of the connecting assembly is arranged on the rear side of the connecting assembly, and the front end of the fourth air outlet hole is communicated with the mounting channel behind the piston ring; the connecting component comprises a first guide column, a first cover plate and a second cover plate which are hermetically and fixedly arranged together, the rear end of the chuck body and the front end of the first cover plate are hermetically and fixedly arranged together, at least one first guide groove with a forward opening is uniformly distributed at intervals along the circumference at the front end of the first cover plate corresponding to the position of the mounting channel, the rear end of the piston ring corresponding to the position of each first guide groove is provided with a second guide groove with a backward opening, a first guide post with the front part outside sleeved in the corresponding second guide groove is fixedly arranged in each first guide groove, a space is arranged between the front end of each first guide post and the bottom wall of the corresponding second guide groove, the front end of the mandrel is fixedly arranged with the rear end of the second cover plate, the fourth air inlet hole comprises a sixth air inlet hole and a seventh air inlet hole, a sixth air inlet hole which is communicated from front to back is arranged at the rear side of the second cover plate corresponding to the front position of the third air inlet hole, a seventh air inlet hole with one end corresponding to the sixth air inlet hole and the other end extending to the front end surface of the first cover plate close to the outer side is arranged at the rear end of the first cover plate, the fourth air outlet hole comprises a fifth air outlet hole and a sixth air outlet hole, a fifth air outlet hole which is communicated from front to back is arranged at the rear side of the second cover plate corresponding to the front position of the third air outlet hole, a sixth air outlet hole which is communicated with the front and the back is arranged at the back side of the first cover plate corresponding to the fifth air outlet hole, a back bearing and a front bearing are respectively arranged at the outer side of the mandrel corresponding to the back and the front of the slip ring and the inner side of the shaft seat, a first end cover is fixedly arranged at the rear end of the shaft seat corresponding to the rear position of the rear bearing, a first locking nut screwed on the outer side of the rear part of the mandrel is hermetically arranged at the inner side of the first end cover, a second end cover is fixedly arranged at the front end of the shaft seat corresponding to the front side of the front bearing, and a second locking nut screwed on the outer side of the front part of the mandrel is hermetically arranged on the inner side of the second end cover; the installation channel corresponding to the front position of the mandrel comprises a first straight hole section, a second straight hole section and a taper hole section which are sequentially communicated from back to front, the diameter of the first straight hole section is larger than that of the second straight hole section, the diameter of the second straight hole section is larger than that of the rear end of the taper hole section, the diameter of the rear end of the taper hole section is smaller than that of the front end of the taper hole section, the outer side of the rear portion of the tip is a conical surface matched with the inner wall of the front portion of the taper hole section, a floating piston is installed in the second straight hole section in a sealing mode, and a plurality of fourth installation holes communicated with the rear portion of the taper hole section are evenly distributed at intervals on the outer side of the front portion of the chuck body corresponding to the position between the rear portion of the tip and the front portion of the floating piston.

5. The tap machining center according to claim 1, 2 or 4, wherein the material tray mechanism comprises a fixed seat, a material tray and guide assemblies, the material tray is arranged above the material rack, a plurality of fixed hole groups are uniformly distributed on the left side and the right side of the upper side of the material tray at intervals, each fixed hole group comprises a plurality of fixed through holes which are uniformly distributed at intervals in the front and back direction, a plurality of weight reducing grooves which are arranged in the front and back direction and have groove widths smaller than the diameters of the fixed through holes are uniformly distributed on the left side and the right side of the lower side of the material tray at intervals, the lower end of each fixed through hole is communicated with the bottom wall of the weight reducing groove at the corresponding position, the fixed seat which is fixedly arranged with the material rack is arranged on the lower side of the material tray, the guide assemblies are arranged between the fixed seat and the material tray at intervals and comprise guide pins, elastic reset pieces and locking nuts, at least two guide holes are uniformly distributed at intervals along the circumferential direction on the lower side of the charging tray, a connecting hole which is through up and down is formed in the upper side of the fixing seat corresponding to the position of each guide hole, the connecting hole comprises a guide section and a connecting section, the diameter of the guide section and the connecting section are sequentially increased from top to bottom, a locking nut is fixedly arranged on the inner side of the lower part of the connecting section, a guide pin, the upper end of which is sleeved in the guide hole at the corresponding position, is slidably arranged in the guide section, a guide surface which is small in size at the upper end and large in size at the lower end is arranged on the outer side of the upper end of the guide pin, a limiting ring platform is fixed on the outer side of the lower end of the guide pin, and an elastic reset piece which enables the upper end of the limiting ring platform to be tightly abutted against a transition surface between the guide section and the connecting section is arranged between the lower end of the guide pin and the upper end of the locking nut; the front side and the rear side of the middle part of the charging tray are respectively provided with a first clamping groove with an upward opening, the left side inner wall and the right side inner wall of the first clamping groove are respectively provided with a left-right symmetrical arc surface, the front side and the rear side of the lower part of the fixing seat corresponding to the front side and the rear side of the charging tray are respectively fixed with a connecting block, the upper side of the connecting block is provided with a pressing screw hole, a pressing bolt is screwed in the pressing screw hole, the upper part of the pressing bolt is fixedly provided with a fixing plate, the lower side of the fixing plate is contacted with the bottom wall of the corresponding first clamping groove, the left side and the right side of the middle part of the charging tray are respectively provided with a second clamping groove with a downward opening, the front side inner wall and the rear side inner wall of the second clamping groove are respectively provided with a front-back symmetrical arc surface, and the left side and the right side of the middle part of the fixing seat are respectively provided with a third clamping groove with the same structure as the second clamping groove; the fixed plate is a long circular plate with an upper side provided with a vertically through mounting hole, the upper part of the compression bolt is sleeved in the mounting hole, the side surface of the fixed plate is provided with a fastening hole communicated with the mounting hole, and an anti-rotation screw is screwed in the fastening hole.

6. The tap machining center according to claim 3, wherein the material tray mechanism comprises a fixed base, a material tray and a guide assembly, the material tray is arranged above the material rack, a plurality of fixed hole groups are uniformly distributed on the left side and the right side of the upper side of the material tray at intervals, each fixed hole group comprises a plurality of fixed through holes which are uniformly distributed at intervals in the front and back direction, a plurality of weight reducing grooves which are arranged in the front and back direction at intervals on the left side and the right side of the lower side of the material tray and have the groove width smaller than the diameter of the fixed through holes, the lower end of each fixed through hole is communicated with the bottom wall of the weight reducing groove at the corresponding position, the fixed base which is fixedly arranged with the material rack is arranged on the lower side of the material tray, a plurality of guide assemblies are arranged between the fixed base and the material tray at intervals, each guide assembly comprises a guide pin, an elastic reset member and a locking nut, the lower side of the charging tray is uniformly provided with at least two guide holes at intervals along the circumferential direction, the upper side of the fixed seat corresponding to the position of each guide hole is provided with a through connecting hole, the connecting hole comprises a guide section and a connecting section, the diameter of the guide section and the connecting section are sequentially increased from top to bottom, a locking nut is fixedly arranged on the inner side of the lower part of the connecting section, a guide pin, the upper end of which is sleeved in the guide hole at the corresponding position, is slidably arranged in the guide section, the outer side of the upper end of the guide pin is provided with a guide surface which is small at the top and large at the bottom, the outer side of the lower end of the guide pin is fixedly provided with a limit ring platform, and an elastic reset piece, which enables the upper end of the limit ring platform to be tightly abutted against a transition surface between the guide section and the connecting section, is arranged between the lower end of the guide pin and the upper end of the locking nut; the front side and the rear side of the middle part of the charging tray are respectively provided with a first clamping groove with an upward opening, the left side inner wall and the right side inner wall of the first clamping groove are respectively provided with a left-right symmetrical arc surface, the front side and the rear side of the lower part of the fixing seat corresponding to the front side and the rear side of the charging tray are respectively fixed with a connecting block, the upper side of the connecting block is provided with a pressing screw hole, a pressing bolt is screwed in the pressing screw hole, the upper part of the pressing bolt is fixedly provided with a fixing plate, the lower side of the fixing plate is contacted with the bottom wall of the corresponding first clamping groove, the left side and the right side of the middle part of the charging tray are respectively provided with a second clamping groove with a downward opening, the front side inner wall and the rear side inner wall of the second clamping groove are respectively provided with a front-back symmetrical arc surface, and the left side and the right side of the middle part of the fixing seat are respectively provided with a third clamping groove with the same structure as the second clamping groove; the fixed plate is a long circular plate with an upper side provided with a vertically through mounting hole, the upper part of the compression bolt is sleeved in the mounting hole, the side surface of the fixed plate is provided with a fastening hole communicated with the mounting hole, and an anti-rotation screw is screwed in the fastening hole.

7. The screw tap machining center according to claim 4 or 6, wherein the squaring device comprises a squaring driving mechanism, a squaring grinding wheel and a first cross sliding table, the upper side of the left front part of the workbench is fixedly provided with the first cross sliding table of which the X axis or the Y axis is vertical to the central axis of the center of the second chuck assembly, the upper end of the first cross sliding table is fixedly provided with the squaring driving mechanism, the outer side of the end part of the output shaft of the squaring driving mechanism is fixedly provided with the squaring grinding wheel of which the central axis is parallel to the central axis of the center of the second chuck assembly, the grooving device comprises a grooving driving mechanism, a grooving grinding wheel and a first three-axis sliding table, the upper side of the front part of the workbench is fixedly provided with the first three-axis sliding table of which the X axis or the Y axis is vertical to the central axis of the center of the third chuck assembly, and the rear side of the upper part of the first cross sliding table is fixedly provided with the grooving driving mechanism, a groove grinding wheel with the central axis vertical to the central axis of the center of the third chuck assembly is fixedly arranged on the outer side of the end part of an output shaft of the groove grinding driving mechanism, the groove grinding device comprises a thread grinding driving mechanism, a thread grinding wheel, a second cross sliding table and a first dividing disc, the upper side of the right front part of the workbench is fixedly provided with the second cross sliding table with the X axis or the Y axis vertical to the central axis of the center of the fourth chuck assembly, the upper side of the second cross sliding table is fixedly provided with the first dividing disc, the end surface of the first dividing disc is rotatably provided with the thread grinding driving mechanism, the outer side of the end part of the output shaft of the thread grinding driving mechanism is fixedly provided with the thread grinding wheel with the central axis parallel to the central axis of the center of the fourth chuck assembly, the relief grinding device comprises a relief grinding driving mechanism, a relief grinding wheel, a thirty sliding table and a second dividing disc, the upper side of the right rear part of the workbench is fixedly provided with the third cross sliding table with the X axis or the Y axis vertical to the center of the fifth chuck assembly, a second index plate is fixedly mounted on the upper side of the third crossed sliding table, a relief grinding driving mechanism is rotatably mounted on the end face of the second index plate, a relief grinding wheel with a central axis parallel to the central axis of the tip of the fifth chuck assembly is fixedly mounted on the outer side of the end portion of an output shaft of the relief grinding driving mechanism, the fine grinding device comprises a fine grinding driving mechanism, a fine grinding wheel and a second three-axis sliding table, a second three-axis sliding table with an X axis or a Y axis perpendicular to the central axis of the tip of the sixth chuck assembly is fixedly mounted on the upper side of the rear portion of the workbench, a fine grinding driving mechanism is fixedly mounted on the front side of the upper portion of the second three-axis sliding table, and a fine grinding wheel with a central axis perpendicular to the central axis of the tip of the sixth chuck assembly is fixedly mounted on the outer side of the end portion of the output shaft of the fine grinding driving mechanism.

8. The screw tap machining center according to claim 5, wherein the squaring device comprises a squaring driving mechanism, a squaring grinding wheel and a first cross-shaped sliding table, the first cross-shaped sliding table with an X-axis or a Y-axis perpendicular to the central axis of the center of the second chuck assembly is fixedly mounted on the upper side of the front left portion of the workbench, the squaring driving mechanism is fixedly mounted at the upper end of the first cross-shaped sliding table, the squaring grinding wheel with the central axis parallel to the central axis of the center of the second chuck assembly is fixedly mounted on the outer side of the end portion of an output shaft of the squaring driving mechanism, the groove grinding device comprises a groove driving mechanism, a groove grinding wheel and a first three-axis sliding table, the first three-axis sliding table with the X-axis or the Y-axis perpendicular to the central axis of the center of the third chuck assembly is fixedly mounted on the upper side of the workbench, the groove driving mechanism is fixedly mounted on the rear side of the upper portion of the first cross-shaped sliding table, a groove grinding wheel with the central axis vertical to the central axis of the center of the third chuck assembly is fixedly arranged on the outer side of the end part of an output shaft of the groove grinding driving mechanism, the groove grinding device comprises a thread grinding driving mechanism, a thread grinding wheel, a second cross sliding table and a first dividing disc, the upper side of the right front part of the workbench is fixedly provided with the second cross sliding table with the X axis or the Y axis vertical to the central axis of the center of the fourth chuck assembly, the upper side of the second cross sliding table is fixedly provided with the first dividing disc, the end surface of the first dividing disc is rotatably provided with the thread grinding driving mechanism, the outer side of the end part of the output shaft of the thread grinding driving mechanism is fixedly provided with the thread grinding wheel with the central axis parallel to the central axis of the center of the fourth chuck assembly, the relief grinding device comprises a relief grinding driving mechanism, a relief grinding wheel, a thirty sliding table and a second dividing disc, the upper side of the right rear part of the workbench is fixedly provided with the third cross sliding table with the X axis or the Y axis vertical to the center of the fifth chuck assembly, the upper side of the rear part of the workbench is fixedly provided with a second three-shaft sliding table of which the X shaft or the Y shaft is vertical to the center axis of the sixth chuck assembly, the front side of the upper part of the second three-shaft sliding table is fixedly provided with a fine grinding driving mechanism, and the outer side of the output shaft end part of the fine grinding driving mechanism is fixedly provided with a fine grinding wheel of which the center axis is vertical to the center axis of the sixth chuck assembly.

9. A tapping method using the tapping center as claimed in any one of claims 1 to 8, comprising the steps of:

secondly, material taking, wherein the mechanical arm rotates to enable the clamping jaw mechanism to rotate to the position above the material tray and clamp a screw tap bar, and then the screw tap bar is placed into the first chuck assembly;

fourthly, grinding the groove, wherein the hydraulic rotary table drives the first chuck assembly clamped with the screw tap bar to rotate anticlockwise by 60 degrees to a third chuck assembly position, the first chuck assembly rotates the screw tap bar, and meanwhile, the groove grinding device grinds the spiral groove on the rod part of the screw tap bar;

fifthly, grinding threads, wherein the hydraulic turntable drives the first chuck component clamping the screw tap bar to rotate anticlockwise by 60 degrees to the position of the fourth chuck component, the first chuck component rotates the screw tap bar, and the thread grinding device grinds the threads on the rod part of the screw tap bar;

sixthly, relief grinding, wherein the hydraulic rotary table drives the first chuck assembly clamped with the screw tap bar to rotate 60 degrees anticlockwise to a fifth chuck assembly position, the first chuck assembly rotates the screw tap bar, and the relief grinding device grinds the head of the screw tap bar;