CN109500412B - Combined type precise hard alloy live center and using method thereof - Google Patents
Combined type precise hard alloy live center and using method thereof Download PDFInfo
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- CN109500412B CN109500412B CN201811524534.9A CN201811524534A CN109500412B CN 109500412 B CN109500412 B CN 109500412B CN 201811524534 A CN201811524534 A CN 201811524534A CN 109500412 B CN109500412 B CN 109500412B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B23/00—Tailstocks; Centres
- B23B23/04—Live centres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to the technical field of worm precision machining, and discloses a composite precision hard alloy live center and a using method thereof. The structure of the device comprises a mandrel, a 60-degree hard alloy taper body, an oil cylinder, a positioning device and an oil distribution pipe; the tail end of the mandrel is fixedly arranged in a central hole of a machine tool spindle; the oil distribution pipe is sleeved on the outer wall of the middle end of the mandrel; the outer wall of the front end of the mandrel is fixedly connected with a positioning device; the end face of the front end of the mandrel is fixedly provided with a 60-degree hard alloy taper body. According to the device, the top material is made of hard alloy, the lever principle is utilized in a positioning and fixing mode, and the mechanical arm and the automatic control are effectively combined in a using method, so that the automatic production of positioning and processing the worm with the convex claw is realized, the processing precision of the worm is improved, and the processing quality is ensured.
Description
Technical Field
The invention relates to the technical field of worm precision machining, in particular to a combined type precision hard alloy live center and a using method thereof.
Background
The processing quality of a worm, which is a key part in an electric power steering gear of an automobile, directly influences the whole power assisting process and the brand and price of a whole trolley, the demand of the worm is calculated by millions and millions, and particularly, a large number of worms with convex claws are urgently needed in the existing market. The worm with the convex claws has a special shape, so that the worm is difficult to position during processing, easy to interfere in clamping, low in production efficiency, easy to cause quality problems and high in waste loss, and a line and effective processing mode is needed to promote the productivity.
In the prior art, in the traditional production and processing technology, a screw rod is clamped by a special clamp manually, the angular position and the axial distance are adjusted on a special center seat, and then the worm is clamped and disassembled manually, so that time and labor are wasted. And the special centre is used as the centre, the manufacturing precision of the special centre greatly exceeds 0.001mm, usually 0.005mm-0.01mm, and the processing precision of the worm is seriously influenced.
In order to improve the accuracy of the tip, in the traditional machining, a 60-degree supporting profile of the tip must be ground on a machine tool by using a grinding wheel for grinding a worm. Therefore, the grinding surface of the grinding wheel needs to be corrected into a plurality of profiles, which is time-consuming, labor-consuming, and time-consuming, and the grinding profile of the grinding worm changes. And limited by the material of the grinding wheel, the grinding wheel can not grind the tip of the hard alloy, so the material of the traditional tip is mostly a steel product, the wear resistance of the traditional tip is only 5 percent of that of the hard alloy, the tip needs to be continuously ground in the processing process, and the grinding wheel is continuously trimmed into the required profile of the worm, which is extremely tedious.
Disclosure of Invention
The invention aims to solve the technical problems of low precision, poor wear resistance, complex processing and the like of a centre for processing a worm with a convex claw in the prior art, and provides a combined type precision hard alloy movable centre which is high in precision, strong in wear resistance and capable of being automatically operated.
The invention also aims to provide a using method of the composite type precise hard alloy live center.
The purpose of the invention is realized by the following technical scheme:
a combined type precision hard alloy live center is arranged in a center hole of a movable main shaft of a worm processing machine tool with a convex claw; the device comprises a mandrel, a 60-degree hard alloy taper body, an oil cylinder, a positioning device and an oil distribution pipe; the tail end of the mandrel is fixedly arranged in a central hole of a machine tool spindle; the middle end of the mandrel is positioned on the outer side of a machine tool spindle; two oil paths are arranged inside the middle end of the mandrel and are communicated with an oil cylinder at the front end of the mandrel;
the oil distribution pipe is sleeved on the outer wall of the middle end of the mandrel; the oil distribution pipe is provided with two oil pipe interfaces; each of the two oil pipe connectors is communicated with an oil way in the middle end of the mandrel;
the outer wall of the front end of the mandrel is fixedly connected with a positioning device; the end face of the front end of the mandrel is fixedly provided with a 60-degree hard alloy taper body; the 60-degree hard alloy taper body and the mandrel are positioned on the same horizontal axis; the oil cylinder is positioned and installed on the outer wall of the front end of the mandrel through a connecting piece and is embedded in the front end of the mandrel; the pipeline of the oil cylinder penetrates through the outer wall of the front end of the mandrel;
the positioning device consists of an oil cylinder fixed block, a spring device and a positioning rod, wherein the oil cylinder fixed block is arranged in a pipeline of the oil cylinder and can move along the pipeline; the tail end of the positioning rod is fixedly connected with the outer wall of the oil cylinder fixed block into a whole; the spring device is fixedly connected with the oil cylinder fixed block; a pin shaft is arranged on the positioning rod; the two ends of the pin shaft are fixed in the grooves at the front end of the mandrel, and the positioning rod can rotate along the pin shaft.
Furthermore, the tail end of the mandrel is a Morse taper body, and the Morse taper body is clamped in a central hole of a machine tool spindle.
Further, the surface of the tail end of the mandrel needs to be subjected to precision grinding treatment; the coloring of the Morse taper body and the inner hole of the machine tool spindle is not less than 98 percent.
Furthermore, two deep groove ball bearings and 3U-shaped sealing rings are arranged in the oil distribution pipe; the oil distribution pipe is sleeved on the outer wall of the middle end of the mandrel through a deep groove ball bearing; the end surfaces of the two sides of the oil distribution pipe are not in contact with the end surface of the main shaft of the machine tool and the outer wall of the oil cylinder, and the oil distribution pipe does not rotate along with the mandrel; the U-shaped sealing rings are arranged on the inner wall of the oil distribution pipe at equal intervals.
Two 2-PT1/8 'interfaces are arranged outside the oil distribution sleeve, and the two 2-PT 1/8' interfaces are respectively communicated with an oil way positioned in the middle end of the mandrel; the two 2-PT 1/8' interfaces are respectively externally connected with an external oil pipe.
Furthermore, the positioning rod is shaped like an L; the long rod part of the positioning rod is shaped like a right-angled triangle, a short rod is connected at the right angle, and the lowest part of the bevel edge is fixedly connected with the bottom of the oil cylinder fixed block; the top end of the short rod part of the positioning rod is an oblique conical surface, and the oblique conical surface is not contacted with the 60-degree hard alloy conical body.
Further, the spring device consists of a cylindrical head screw and a compression spring; the cylindrical head screw penetrates through the positioning rod and is fixed inside the oil cylinder fixed block; and the compression spring is sleeved on the screw rod of the cylindrical head screw and is positioned below the positioning rod.
Furthermore, the coaxiality of the 60-degree hard alloy taper body and the mandrel is 0.001 mm.
Furthermore, the tail end of the mandrel is fixedly arranged in a central hole of a main shaft of the machine tool, and the rotation coaxiality of the mandrel does not exceed 0.0015 mm.
A use method of a combined type precision hard alloy live center comprises the following steps:
s1, assembling: clamping the tail end of a mandrel of the live center in a central hole of a machine tool spindle, and connecting two external oil pipes outside an oil pipe interface of an oil distribution pipe;
s2, positioning: a mechanical arm grabs a worm with a convex claw to move to a machine tool machining table, one end of the convex claw of the worm with the convex claw faces a movable center, the other end of the convex claw of the worm with the convex claw faces a fixed center of a tailstock of the machine tool, two ends of the machine tool gather towards the worm, the fixed center abuts against the center of one side of the worm, and a hard alloy taper body of the movable center abuts against a taper groove in the convex claw; an external oil pipe pressurizes and injects oil to the oil cylinder, a fixed block of the oil cylinder moves downwards, and a positioning rod is clamped in a V-shaped groove of the convex claw upwards to clamp the worm;
s3, processing: the main shaft of the machine tool rotates at a slow speed, the centre synchronously drives the worm to rotate by using friction force, and the grinding wheel begins to grind the worm rod surface of the worm;
s4, disassembling: after the processing is finished, the oil cylinder is depressurized, the external oil pipe is used for recovering oil, the oil cylinder fixed block moves upwards, and the positioning rod separates the V-shaped groove of the convex claw; the tip at two ends of the machine tool separates the worm; the mechanical arm picks and recovers the worm.
A processing method of a worm with convex claws, which adopts the compound type precision hard alloy live center and the using method thereof as claimed in any one of claims 1 to 9.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the combined type precision hard alloy live center, the coaxiality precision of the taper body and the Morse body is high in the center structural design, and the rotating coaxiality precision of the taper body and the Morse body is extremely high, so that the machining precision of a worm is greatly improved, and the machining consistency is ensured.
(2) The use method of the combined type precision hard alloy movable center utilizes the oil circuit route in the center and is matched with the mechanical arm to use, so that the automatic positioning, fixing and dismounting of the worm machining are realized, the working environment is optimized, the labor intensity is reduced, and the production efficiency is greatly improved.
(3) The tip material of the composite precise hard alloy live center is hard alloy, the wear resistance is strong, repeated grinding with a grinding wheel is not needed during processing compared with the traditional steel tip, and the service life of the hard alloy tip is prolonged by about 20 times compared with that of the steel tip.
(4) According to the combined type precision hard alloy movable center, the center does not need to be polished by a grinding wheel, so that the profile of the grinding wheel is effectively guaranteed, the spiral profile of the worm is guaranteed by the profile of the grinding wheel, and the radial precision of the worm is guaranteed by the rotation precision of the center. The artificial factors are eliminated, and the quality is more guaranteed.
Drawings
FIG. 1 is a structural diagram of a composite precision hard alloy live center;
FIG. 2 is a sectional view of a combined type precision hard alloy live center in the form of C-C and B-B;
fig. 3 is a working state diagram of the composite precision hard alloy live center.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, a composite precision hard alloy live center is installed in a center hole of a moving main shaft of a worm processing machine tool with a convex claw; the movable center comprises a mandrel 1, a 60-degree hard alloy taper body 13, an oil cylinder 4, a positioning device and an oil distribution pipe 3; the tail end of the mandrel 1 is fixedly arranged in a central hole of a machine tool spindle; the middle end of the mandrel 1 is positioned on the outer side of the main shaft of the machine tool; and the inside of dabber 1 middle-end is equipped with two oil circuits, is as the oil feed route of live center respectively to and the route of producing oil, two oil circuits intercommunication dabber 1 front end's hydro-cylinder 4.
The oil distribution pipe 3 is sleeved on the outer wall of the middle end of the mandrel 1; the oil distribution pipe 3 is provided with two oil pipe interfaces; each of the two oil-saving interfaces is communicated with an oil path inside the middle end of the mandrel 1 and is used as an oil inlet and an oil outlet;
the outer wall of the front end of the mandrel 1 is fixedly connected with a positioning device; the end face of the front end of the mandrel 1 is fixedly provided with a 60-degree hard alloy taper body 13; the 60-degree hard alloy taper body 13 and the mandrel 1 are positioned on the same horizontal axis; the oil cylinder 4 is positioned and arranged on the outer wall of the front end of the mandrel 1 through a connecting piece 5, and part of the oil cylinder 4 is embedded in the front end of the mandrel 1; the anterior segment of above-mentioned hydro-cylinder 4 is equipped with the metal pipeline, and the metal pipeline of hydro-cylinder 4 link up the outer wall of 1 front end of dabber, and in this embodiment 1, connecting piece 5 is interior hexagonal screw 5, and hydro-cylinder 4 fixes the outside at 1 front end of dabber through hexagonal screw 5 in 4, carries out seal weld at the kneck of hydro- cylinder 4 and 1 front end of dabber simultaneously and handles, both fixed hydro-cylinder 4, also prevents simultaneously that fluid from flowing from the joint gap.
As shown in fig. 1-2, the positioning device comprises an oil cylinder fixed block 8, a spring device and a positioning rod 6, wherein the oil cylinder fixed block 8 is in a shape and size which are in sealed fit clamping with a metal pipeline of the oil cylinder 4 to prevent oil from leaking; the oil cylinder fixed block 8 is arranged in a metal pipeline of the oil cylinder 4, and the oil cylinder fixed block 8 moves up and down along the pipeline under the pressure intensity inside the oil cylinder 4 and the change of the volume of oil liquid; the tail end of the positioning rod 6 is fixedly connected with the outer wall of the oil cylinder fixed block 8 into a whole; the spring device is fixedly connected with an oil cylinder fixed block 8; a pin shaft 7 is arranged on the positioning rod 6; two ends of the pin shaft 7 are fixed in the groove at the front end of the mandrel 1, and the positioning rod 6 can rotate along the pin shaft 7.
As shown in fig. 1, in this embodiment 1, the tail end of the mandrel 1 is a morse taper body, and the morse taper body is clamped in a central hole of a machine tool spindle. And the surface of the tail end of the mandrel 1 needs to be subjected to precision grinding treatment before a central hole of a machine tool main shaft is installed, so that the surface smoothness is ensured, and the coloring of the Morse taper body of the mandrel 1 and the inner hole of the machine tool main shaft is not less than 98%. Make the morse taper body of dabber 1 can be better the joint at the centre bore of lathe main shaft, during operation, the rotatory axiality of dabber 1 and lathe main shaft is higher.
As shown in fig. 1, an oil distribution pipe 3 is sleeved on the middle end of a mandrel 1 of the live center, in this embodiment 1, two deep groove ball bearings 12 and 3U-shaped seal rings 2 are arranged inside the oil distribution pipe 3; the deep groove ball bearing 12 is sleeved on the outer wall of the middle end of the mandrel 1; the end surfaces of the two sides of the oil distribution pipe 3 are not in contact with the end surface of the main shaft of the machine tool and the outer wall of the oil cylinder 4, and the oil distribution pipe 3 does not rotate along with the mandrel 1 while the rotation of the mandrel 1 is not influenced due to the action of the deep groove ball bearing 12; the U-shaped sealing rings 2 are equidistantly arranged on the inner wall of the oil distribution pipe 3, and the U-shaped sealing rings 2 can play a role in sealing and isolating the oil distribution sleeve to prevent oil from leaking.
Two 2-PT1/8 ' interfaces are arranged outside the oil distribution sleeve, the two 2-PT1/8 ' interfaces are respectively communicated with an oil path positioned inside the middle end of the mandrel 1 and used as an oil inlet and an oil outlet of the movable center, and an external oil pipe 11 is externally connected to each of the two 2-PT1/8 ' interfaces and used as an oil inlet pipeline and an oil outlet pipeline outside the oil cylinder 4.
As shown in fig. 1, in the present embodiment 1, the positioning rod 6 has a shape similar to "L"; the long rod part of the positioning rod 6 is shaped like a right-angled triangle, a short rod is connected at the right angle of the long rod, and the lowest part of the bevel edge of the long rod is fixedly connected to the bottom of the oil cylinder fixed block 8 in a welding mode; the top end of the short rod part of the positioning rod 6 is an oblique conical surface which is not contacted with the 60-degree hard alloy conical body, so that the positioning rod 6 is prevented from positioning and rotating to interfere with the 60-degree hard alloy conical body.
The spring device of the positioning device consists of a cylindrical head screw 9 and a compression spring 10; a cylindrical head screw 9 passes through the positioning rod 6 and is fixed inside the oil cylinder fixed block 8; and the compression spring 10 is sleeved on a screw rod of the cylindrical head screw 9 and is positioned below the positioning rod 6.
In the invention, when the oil cylinder fixed block 8 is in a non-working state, as shown in figure 3-B, the oil cylinder fixed block is firstly arranged at the high position of the metal pipeline of the oil cylinder 4, at the moment, the positioning rod 6 is connected with the oil cylinder fixed block 8, the long rod of the positioning rod 6 is lifted, and the short rod is lowered. When the 60-degree hard alloy taper body and the worm with the convex claws are positioned, the positioning rod 6 cannot cause positioning influence on the taper body. When the worm-gear worm gear is in a working state, as shown in a figure 3-A, C, an oil inlet pipeline is pressurized and filled, oil liquid enters an oil cylinder 4 through an oil inlet route and flows into a metal pipeline, the pressure in the metal pipeline is continuously increased along with the continuous gathering of the oil liquid in the metal pipeline, under the action of the pressure, an oil cylinder fixed block 8 moves downwards, a compression spring 10 contracts to drive a tapered surface of a short rod of a positioning rod 6 to move upwards and finally be clamped in a V-shaped groove outside a convex claw of the worm-gear; after the processing is finished, the pressure inside the oil cylinder 4 is relieved, oil is discharged through an oil outlet route at the moment, and when the internal pressure of the metal pipeline is reduced, the oil cylinder fixed block 8 is upwards displaced under the action of elastic force generated by the reduction of the compression spring 10 to drive the oblique conical surface at the short rod part of the positioning rod 6 to be separated from the convex claw.
As shown in fig. 1, in the embodiment 1, a 60 ° cemented carbide taper body 13 is fixedly arranged on the end face of the front end of the mandrel 1; the 60-degree hard alloy taper body 13 and the mandrel 1 are located on the same horizontal axis, and the coaxiality of the 60-degree hard alloy taper body 13 and the mandrel 1 is 0.001 mm.
In the embodiment 1, the tail part of the mandrel 1 is fixedly installed in the central hole of the machine tool spindle, and the axis of the tail end of the mandrel 1 and the axis of the machine tool spindle ensure consistency, so that the rotating coaxiality of the spindle of the machine tool and the mandrel 1 does not exceed 0.0015 mm.
As shown in fig. 3, a in the drawing is a working state that the live center is pressurized and filled with oil on a machine tool; in the figure B, the movable center is in a non-working state or in a working state of pressure relief and oil drainage on a machine tool; in the figure, C is a schematic structural view of a claw of a positioning rod 6 of a live center clamping the worm.
The invention relates to a using method of a composite precise hard alloy live center, which comprises the following steps:
s1, assembling: the tail end of a mandrel 1 of the movable center is clamped in a central hole of a machine tool main shaft, and two external oil pipes 11 are externally connected to oil pipe interfaces of the oil distribution pipes 3 and used as oil outlet pipelines and oil inlet pipelines which are connected with the external parts of the oil cylinders 4.
S2, positioning: after the movable center is arranged on the machine tool, the machine tool is matched with a manipulator for use, and the manipulator is used for grabbing the worm with the convex claw. Firstly, a manipulator grabs a worm with a convex claw at a place where an unprocessed worm with the convex claw is placed and moves to a machine tool machining table, and the placing position of the worm with the convex claw is controlled, wherein one end of the worm with the convex claw faces a movable center, and the other end of the worm with the convex claw faces a fixed center of a tailstock of the machine tool; then the two ends of the machine tool gather to the worm, the fixed center is propped against the center of one side of the worm, and the hard alloy taper body 13 of the movable center is propped against the taper groove in the convex claw; after the pushing of the taper bodies of the centers on the two sides is finished, the worm is loosened by the manipulator and returns to the original position. An external oil pipe 11 starts to pressurize, oil is injected into the oil cylinder 4 from an external oil inlet pipeline along an oil inlet route, the oil cylinder fixed block 8 is displaced downwards under the action of the acting force increased by the pressure intensity in the oil cylinder 4, the oblique conical surface of the short rod of the positioning rod 6 is driven to move upwards and is clamped in the V-shaped groove of the convex claw, and the clamping worm is fixed;
s3, processing: after the centre and the worm are fixedly positioned, the machine tool main shaft starts to rotate at a low speed, the centre synchronously drives the worm to rotate by using a huge friction force generated by a connecting point of the centre and the worm, and the grinding wheel starts to grind the spiral profile of the worm;
s4, disassembling: after the processing is finished, the pressure inside the oil cylinder is relieved, oil flows out of the external oil pipe 11 through an oil outlet route due to the fact that the pressure inside the oil cylinder 4 is reduced, at the moment, the oil cylinder fixed block 8 moves upwards and drives the short rod oblique conical surface of the positioning rod 6 to separate a V-shaped groove of the convex claw, and when the oil cylinder fixed block 8 returns to the original position; the mechanical arm grabs and retrieves the worm, and the top at the two ends of the machine tool is separated from the worm.
Compared with the traditional worm positioning and processing method with the convex claws, the fixing and positioning method has the advantages that the whole process is automatic, only the movable center needs to be manually installed manually, an external oil pipe is connected, the manipulator is used for matching processing, and the whole processes of acquiring, positioning, fixing, disassembling and recovering parts are automatically operated. Its automatic core is PLC control system, utilizes system's response location, and automated control pressurization oiling, the time of pressure release oil extraction snatchs and retrieves and automatic location and fixed with traditional mechanical automation emery wheel abrasive machining, cooperation manipulator, and the three combines together, and the effectual tradition of having solved takes the claw processing location fixed difficulty, the loaded down with trivial details difficulty of clamping.
The precision hard alloy live center has the advantages that the coaxiality precision of the 60-degree hard alloy taper body 13, the Morse taper body at the tail end of the mandrel 1 and the center of the machine tool spindle is high, so that the rotating coaxiality of the live center and the machine tool spindle is extremely high when the live center rotates, and the worm machining precision is further optimized.
The taper body 13 of the precision hard alloy live center adopts hard alloy, and the hard alloy has strong wear resistance, so that the taper body does not need to be repeatedly polished by a grinding wheel with the traditional steel tip during processing, the service life of the hard alloy tip is prolonged by about 20 times compared with that of the steel tip, and meanwhile, the taper body 13 does not need to be polished by the grinding wheel, so that the profile of the grinding wheel can be effectively ensured, the spiral profile of the worm is ensured by the profile of the grinding wheel, and the radial precision of the worm is completely ensured by the rotating precision of the tip. The artificial factors are eliminated, and the quality is more guaranteed.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A combined type precision hard alloy live center is arranged in a center hole of a movable main shaft of a worm processing machine tool with a convex claw; the device is characterized by comprising a mandrel, a 60-degree hard alloy taper body, an oil cylinder, a positioning device and an oil distribution pipe; the tail end of the mandrel is fixedly arranged in a central hole of a machine tool spindle; the middle end of the mandrel is positioned on the outer side of a machine tool spindle; two oil ways are arranged inside the middle end of the mandrel and are communicated with an oil cylinder at the front end of the mandrel;
the oil distribution pipe is sleeved on the outer wall of the middle end of the mandrel; the oil distribution pipe is provided with two oil pipe interfaces; the two oil pipe interfaces are respectively communicated with an oil way in the middle end of the mandrel;
the outer wall of the front end of the mandrel is fixedly connected with a positioning device; the end face of the front end of the mandrel is fixedly provided with a 60-degree hard alloy taper body; the 60-degree hard alloy taper body and the mandrel are positioned on the same horizontal axis; the oil cylinder is positioned and installed on the outer wall of the front end of the mandrel through a connecting piece and is embedded in the front end of the mandrel; the pipeline of the oil cylinder penetrates through the outer wall of the front end of the mandrel;
the positioning device consists of an oil cylinder fixed block, a spring device and a positioning rod; the oil cylinder fixed block is arranged in a pipeline of the oil cylinder and can move along the pipeline; the tail end of the positioning rod is fixedly connected with the outer wall of the oil cylinder fixed block into a whole; the spring device is fixedly connected with the oil cylinder fixed block; a pin shaft is arranged on the positioning rod; two ends of the pin shaft are fixed in grooves at the front end of the mandrel, and the positioning rod can rotate along the pin shaft;
the spring device consists of a cylindrical head screw and a compression spring; the cylindrical head screw penetrates through the positioning rod and is fixed inside the oil cylinder fixed block; and the compression spring is sleeved on the screw rod of the cylindrical head screw and is positioned below the positioning rod.
2. The composite precision hard alloy live center as claimed in claim 1, wherein the tail end of the mandrel is a morse taper body, and the morse taper body is clamped in a central hole of a machine tool spindle.
3. The composite precision hard alloy live center as claimed in claim 2, wherein the surface of the tail end of the mandrel is subjected to precision grinding treatment; the coloring of the Morse taper body and the inner hole of the machine tool spindle is not less than 98%.
4. The composite precision hard alloy live center as claimed in claim 1, wherein two deep groove ball bearings and 3U-shaped sealing rings are arranged in the oil distribution pipe; the oil distribution pipe is sleeved on the outer wall of the middle end of the mandrel through a deep groove ball bearing; the end surfaces of the two sides of the oil distribution pipe are not in contact with the end surface of the main shaft of the machine tool and the outer wall of the oil cylinder, and the oil distribution pipe does not rotate along with the mandrel; the U-shaped sealing rings are arranged on the inner wall of the oil distribution pipe at equal intervals;
two 2-PT1/8 'interfaces are arranged outside the oil distribution pipe, and the two 2-PT 1/8' interfaces are respectively communicated with an oil way positioned inside the middle end of the mandrel; and the two 2-PT 1/8' interfaces are respectively externally connected with an external oil pipe.
5. The composite type precision hard alloy live center according to claim 1, wherein the positioning rod is shaped like an L; the long rod part of the positioning rod is shaped like a right-angled triangle, a short rod is connected at the right angle, and the lowest part of the bevel edge is fixedly connected with the bottom of the oil cylinder fixed block; the top end of the short rod part of the positioning rod is an oblique conical surface, and the oblique conical surface is not contacted with the 60-degree hard alloy conical body.
6. The composite precision hard alloy live center according to claim 1, wherein the coaxiality of the 60-degree hard alloy taper body and the mandrel is 0.001 mm.
7. The composite precision hard alloy live center as claimed in claim 1, wherein the tail end of the mandrel is fixedly installed in a central hole of a main shaft of a machine tool, and the rotation coaxiality of the mandrel is not more than 0.0015 mm.
8. The use method of the compound type precision hard alloy live center according to claim 1, wherein the compound type precision hard alloy live center is used by the following steps:
s1, assembling: clamping the tail end of a mandrel of the movable center in a central hole of a machine tool spindle, and connecting two external oil pipes outside an oil pipe interface of an oil distribution pipe;
s2, positioning: the mechanical arm grabs a worm with a convex claw and moves to a machine tool machining table, one end of the convex claw of the worm with the convex claw faces a movable center, the other end of the convex claw faces a fixed center of a tailstock of the machine tool, two ends of the machine tool gather towards the worm, the fixed center abuts against the center of one side of the worm, and a hard alloy taper body of the movable center abuts against a taper groove in the convex claw; an external oil pipe pressurizes and injects oil to the oil cylinder, a fixed block of the oil cylinder moves downwards, and a positioning rod is clamped in a V-shaped groove of the convex claw upwards to clamp the worm;
s3, processing: the main shaft of the machine tool rotates at a slow speed, the tip synchronously drives the worm to rotate by using friction force, and the grinding wheel begins to grind the spiral surface of the worm;
s4, disassembling: after the processing is finished, the oil cylinder is depressurized, an external oil pipe recovers oil, the oil cylinder fixed block moves upwards, and the positioning rod separates the V-shaped groove of the convex claw; the mechanical arm grabs and recovers the worm; the centers at the two ends of the machine tool separate the worms.
9. A processing method of a worm with convex claws is characterized in that a compound type precision hard alloy movable center as claimed in any one of claims 1 to 7 and a use method as claimed in claim 8 are adopted.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3925854A (en) * | 1973-10-09 | 1975-12-16 | James D Mcfadden | Alignment clamp |
| SE7908364L (en) * | 1979-10-09 | 1981-04-10 | Universal Inventions Ltd | UNIVERSAL DRAWERS |
| US6439974B1 (en) * | 1998-07-15 | 2002-08-27 | Fritz Studer Ag | Workpiece holder for a machine tool |
| CN202622559U (en) * | 2012-09-14 | 2012-12-26 | 陕西汉江机床有限公司 | Rotatable blade peripheral grinding machine workpiece clamping and transmission device |
| CN203003169U (en) * | 2012-12-28 | 2013-06-19 | 沈阳机床成套设备有限责任公司 | Chuck center individual control mechanism of numerical control bent axle inner milling lathe |
| CN103286333A (en) * | 2013-06-27 | 2013-09-11 | 上海三一精机有限公司 | Hydraulic tailstock structure and machine tool |
| CN104385020A (en) * | 2014-09-28 | 2015-03-04 | 陕西高华知本化工科技有限公司 | No-stopping cutting clamp |
| CN204276926U (en) * | 2014-11-24 | 2015-04-22 | 浙江勒托新材料有限公司 | A kind of novel lathe tailstock |
| CN104668592A (en) * | 2014-12-20 | 2015-06-03 | 重庆巨康建材有限公司 | Adjustable and movable jacking device |
| CN108202242A (en) * | 2016-12-20 | 2018-06-26 | 上海电气电站设备有限公司 | A kind of clamping tooling |
| CN108526896A (en) * | 2018-06-26 | 2018-09-14 | 董建龙 | A kind of Worm processing apparatus |
-
2018
- 2018-12-13 CN CN201811524534.9A patent/CN109500412B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3925854A (en) * | 1973-10-09 | 1975-12-16 | James D Mcfadden | Alignment clamp |
| SE7908364L (en) * | 1979-10-09 | 1981-04-10 | Universal Inventions Ltd | UNIVERSAL DRAWERS |
| US6439974B1 (en) * | 1998-07-15 | 2002-08-27 | Fritz Studer Ag | Workpiece holder for a machine tool |
| CN202622559U (en) * | 2012-09-14 | 2012-12-26 | 陕西汉江机床有限公司 | Rotatable blade peripheral grinding machine workpiece clamping and transmission device |
| CN203003169U (en) * | 2012-12-28 | 2013-06-19 | 沈阳机床成套设备有限责任公司 | Chuck center individual control mechanism of numerical control bent axle inner milling lathe |
| CN103286333A (en) * | 2013-06-27 | 2013-09-11 | 上海三一精机有限公司 | Hydraulic tailstock structure and machine tool |
| CN104385020A (en) * | 2014-09-28 | 2015-03-04 | 陕西高华知本化工科技有限公司 | No-stopping cutting clamp |
| CN204276926U (en) * | 2014-11-24 | 2015-04-22 | 浙江勒托新材料有限公司 | A kind of novel lathe tailstock |
| CN104668592A (en) * | 2014-12-20 | 2015-06-03 | 重庆巨康建材有限公司 | Adjustable and movable jacking device |
| CN108202242A (en) * | 2016-12-20 | 2018-06-26 | 上海电气电站设备有限公司 | A kind of clamping tooling |
| CN108526896A (en) * | 2018-06-26 | 2018-09-14 | 董建龙 | A kind of Worm processing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109500412A (en) | 2019-03-22 |
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