CN214080539U - Workpiece centering device and peripheral grinding machine - Google Patents

Abstract

The utility model discloses a workpiece centering device and a peripheral grinding machine, which comprises an installation base, a turntable table surface, a clamping assembly and a piston assembly; the rotary table top is erected on the mounting base and is rotationally connected with the mounting base, a cavity is formed in the center of the rotary table top, the piston assembly is fixed in the cavity, a piston rod of the piston assembly penetrates through the cavity and is fixedly connected with the clamping assembly, and the piston rod can perform vertical feeding motion; the workpiece centering device further comprises a guide assembly, and the guide assembly concentrically limits a plurality of axial points or axial sections on the piston rod along the circumferential direction of the piston rod so that the piston rod can move along a straight line. The utility model discloses can guarantee that the piston rod can not produce radial deviation at any position of axial to it is accurate that the messenger is located the terminal blade location of piston rod, improves the machining precision.

Description

Workpiece centering device and peripheral grinding machine

Technical Field

The utility model relates to a peripheral grinding machine designs technical field, especially relates to a work piece centring means, peripheral grinding machine.

Background

The indexable insert grinding machine is a machine tool designed for the industries and fields of aerospace, automobile manufacturing, engineering machinery, railway locomotives and the like, can grind the periphery of inserts made of different materials, different specifications and different shapes, and can keep the precision of the inserts.

The blade is usually pushed to a processing station by air pressure in a piston assembly, because the size of a machine tool is large, and the length of the piston rod is also large, the positioning accuracy of the blade is easily reduced due to a small internal radial clearance of the piston rod in the pushing process, a guide element is often required to be added on the piston rod, but the guide element in the prior art is simple in bearing seal and only arranged at the end part of the piston rod, the guide element and the piston rod are almost in a line contact form, the positioning accuracy of each point in the axial direction of the piston rod cannot be guaranteed, and when the length of the piston rod is large, the condition that the blade is positioned inaccurately still can be generated, so that a workpiece centering device and a peripheral grinding machine which can accurately position and center are required to be designed, and the grinding accuracy of the blade is guaranteed.

SUMMERY OF THE UTILITY MODEL

In order to solve peripheral grinding machine among the prior art because of the unstable radial position of piston rod propelling movement in-process, lead to the technical problem that the positioning accuracy of blade reduces, the utility model provides a workpiece centering device, peripheral grinding machine and workpiece positioning centering's adjustment method solves above-mentioned problem.

The utility model provides a workpiece centering device, which comprises an installation base, a turntable table surface, a clamping assembly and a piston assembly; the rotary table top is erected on the mounting base and is rotationally connected with the mounting base, a cavity is formed in the center of the rotary table top, the piston assembly is fixed in the cavity, a piston rod of the piston assembly penetrates through the cavity and is fixedly connected with the clamping assembly, and the piston rod can perform vertical feeding motion; the workpiece centering device further comprises a guide assembly, and the guide assembly concentrically limits a plurality of axial points or axial sections on the piston rod along the circumferential direction of the piston rod so that the piston rod can move along a straight line.

The plurality of axial points or axial sections mean that the contact surface of the guide assembly and the piston rod is improved into a plurality of line contacts or columnar surface contacts arranged at intervals from single line contact in the prior art, and meanwhile, the guide assembly has identity and integrity to the central limit of the piston rod instead of independent respective central limit, so that the radial offset of the telescopic motion of the piston rod can be guaranteed to be zero.

Furthermore, the guide assembly comprises at least two first guide structures which are positioned in the cavity and sleeved on the periphery of the piston rod, each first guide structure comprises a guide unit mounting seat and a guide sleeve bearing sleeved between the guide unit mounting seat and the piston rod, and the guide sleeve bearing concentrically limits the axial section of the piston rod; the guide unit mounting seat is fixedly connected with a cylinder body of the piston assembly.

Furthermore, the guide sleeve bearing comprises a bearing body and balls, wherein a plurality of rows of mutually separated track grooves are arranged on the inner circumferential surface of the bearing body along the circumferential direction, a plurality of balls are arranged in each row of track grooves, and the balls are in rolling contact with the piston rod.

Furthermore, the guide assembly further comprises two second guide structures fixed above the table top of the rotary table, each second guide structure comprises a mounting base and a guide bearing with a handle, and the guide bearings with the handle of the two second guide structures are oppositely arranged on two sides of the circumferential direction of the piston rod along the Y axis and are in rolling contact with the piston rod.

Furthermore, the piston rod is provided with a milling flat surface in contact fit with the guide bearing with the handle, and the length of the milling flat surface is larger than the feeding stroke of the piston rod.

Furthermore, the clamping assembly comprises a positioning seat connected with the piston rod and a V-shaped block fixed with the positioning seat, and a V-shaped opening suitable for clamping a workpiece is formed in the top of the V-shaped block; and a waist-shaped hole is further formed in the V-shaped block, the waist-shaped hole extends along the vertical direction, and a screw penetrates through the waist-shaped hole to enable the V-shaped block to be fixedly connected with the positioning seat.

Further, the positioning seat with still be connected with the fine setting unit between the piston rod, the fine setting unit is including fine setting mount pad and wedge locating piece, the bottom of positioning seat is equipped with the dovetail, the dovetail link up the extension along the X axle, the top of fine setting mount pad is equipped with unilateral forked tail boss, unilateral forked tail boss and wedge locating piece are arranged side by side and are pressed from both sides jointly and locate in the dovetail.

Furthermore, the workpiece centering device also comprises a stroke measuring unit, wherein the stroke measuring unit comprises a transmitting rod fixedly connected with the bottom of the piston rod, and a first photoelectric switch and a second photoelectric switch fixedly connected with the mounting base; the first signaling boss and the second signaling boss are arranged on the signaling rod and located below the first signaling boss, and when the first signaling boss triggers the first photoelectric switch, the piston rod reaches a lower limit position; when the second transmitting lug boss triggers the second photoelectric switch, the piston rod reaches an upper limit position.

The utility model also provides a peripheral grinding machine, more than including work piece centring means and be fixed in the last work piece of revolving stage mesa presss from both sides tight unit, the work piece presss from both sides tight top and the tight top of clamp end clamp of position end clamp, and the tight top of clamp end clamp of position end and clamp end clamp are for the processing station between the top, work piece centring means be suitable for with the work piece transport extremely the processing station.

The utility model also provides an adjustment method of work piece location centering, this method uses above peripheral grinding machine, including following several steps:

s1: and pushing the workpiece to a processing station along the axial direction of the piston rod by using the piston assembly.

S2: and horizontally rotating the table top of the rotary table to adjust the angle of the workpiece.

S3: and clamping the workpiece by the clamping end clamping center, and finishing the clamping of the workpiece.

The utility model has the advantages that:

(1) workpiece centering device, place the work piece on the clamping subassembly to it is spacing to the piston rod through the direction subassembly, and the direction subassembly acts on a plurality of axial points or axial section on the piston rod, consequently the direction subassembly is to the spacing axial extension of piston rod along, guarantees that the piston rod can not produce radial deviation at any position of axial, thereby the messenger is located the terminal blade location of piston rod accurate, improves the machining precision.

(2) Work piece centring means, the direction subassembly is for setting up two at least first guide structure in the cavity, first guide structure acts on along the axial segmentation of piston rod for compensate the radial clearance of cavity inner piston rod.

(3) Work piece centring means, the rolling contact of first guide structure and piston rod is realized through the raceway groove of rectangular shape and a plurality of balls that are located the raceway groove to first guide structure, for column surface contact between first guide structure and the piston rod, carries on spacingly to certain shaft bracket on the piston rod, can effectively avoid the piston rod crooked to adjacent raceway groove alternate segregation, every roller can be at respective raceway inslot circulation roll, reduces the noise of motion of structure.

(4) The utility model provides a direction subassembly still includes second guide structure, and second guide structure is located the top of revolving stage mesa, and the tip that is close to blade installation position on the piston rod is further spacing to the piston rod.

(5) The utility model discloses in still be provided with the fine setting unit, the fine setting unit finely tunes the position of work piece at the X axle, and the fine setting unit cooperates jointly with second guide structure, makes the horizontal location of work piece more accurate.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a perspective view of a workpiece centering device according to the present invention;

fig. 2 is a top view of a workpiece centering device according to the present invention;

FIG. 3 is a sectional view taken along line B-B of FIG. 2;

FIG. 4 is an enlarged view at f of FIG. 3;

FIG. 5 is a top view of the piston assembly of the present invention;

FIG. 6 is a cross-sectional view taken along line D-D of FIG. 5;

FIG. 7 is a sectional view taken along line E-E of FIG. 5;

FIG. 8 is an enlarged view at g of FIG. 6;

FIG. 9 is a sectional view taken along line F-F of FIG. 6;

FIG. 10 is a top view of the peripheral grinding machine of the present invention;

FIG. 11 is a front view of the peripheral grinding machine of the present invention;

FIG. 12 is an enlarged view taken at a in FIG. 10;

FIG. 13 is an enlarged view of FIG. 11 at b;

FIG. 14 is a sectional view taken along line A-A of FIG. 10;

FIG. 15 is an enlarged view at c of FIG. 14;

FIG. 16 is an enlarged view at d of FIG. 14;

fig. 17 is an enlarged view at e in fig. 14.

In the figure, 1, a mounting base, 2, a turntable table top, 3, a clamping assembly, 301, a positioning seat, 3011, a dovetail groove, 3012, a threaded hole, 302, a V-shaped block, 303, a kidney-shaped hole, 304, a fine adjustment mounting seat, 3041, a single-side dovetail boss, 305, a wedge-shaped positioning block, 306, a transition connecting seat, 307, a positioning pin assembly, 308, a third screw, 309, a positioning flat key, 310, a fourth screw, 4, a piston assembly, 401, a piston rod, 4011, a milling flat surface, 402, a cylinder body, 403, an upper cavity, 404, an upper cavity air inlet channel, 405, an upper cavity air inlet pipe joint, 406, a lower cavity, 407, a lower cavity air inlet channel, 408, an air inlet lower cavity pipe joint, 5, a cavity, 6, a workpiece, 7, a first screw, 8, a second screw, 9, a first guide structure, 901, a guide unit mounting seat, 902, a guide unit bearing, a guide sleeve bearing, 9021, a bearing body, 9022, a ball, a guide sleeve 23, a roller channel groove, 903, a roller channel groove, a roller groove, a screw hole, a fine adjustment assembly, a fine adjustment mounting seat, a fine adjustment assembly, a fine, The device comprises an O-shaped sealing ring, 904, a sliding sealing ring, 905, a hole elastic collar, 10, a second guide structure, 1001, a guide base, 10011, a kidney-shaped installation hole, 1002, a handle guide bearing, 11, a rotor, 12, a stator, 13, a turntable main support bearing, 14, an auxiliary support bearing, 15, an angle encoder, 16, a stroke measurement unit, 1601, a transmission rod, 16011, a first transmission boss, 16012, a second transmission boss, 1602, a first photoelectric switch, 1603, a second photoelectric switch, 1604, a photoelectric switch installation bracket, 17, a workpiece clamping unit, 1701, a positioning end clamping tip, 1702, a clamping end clamping tip, 1703, a positioning push rod, 18, a position online detection unit, 1801, a detection sensor, 1802, an installation bracket, 1803, a limit locking nut, 1804 and a guide support bracket.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the present invention, the Z axis is the direction parallel to the extending and retracting direction of the piston rod 401 in the piston assembly 4 for centering the workpiece 6, wherein the moving direction when the piston rod 401 extends out is the Z axis forward direction, the Y axis is the direction parallel to the extending and retracting direction of the positioning end clamping tip 1701 and the clamping end clamping tip 1702 in the workpiece clamping unit 17, wherein the direction in which the clamping end clamping tip 1702 approaches to the positioning end clamping tip 1701 is the Y axis forward direction, and the X axis is the direction perpendicular to the Y axis and the Z axis simultaneously.

In addition, in the present invention, the workpiece 6 is a blade to be ground.

The first embodiment is as follows:

a workpiece centering device is shown in figures 1 and 2 and comprises a mounting base 1, a turntable table top 2, a clamping assembly 3 and a piston assembly 4; the turntable table top 2 is erected on the mounting base 1 and is rotatably connected with the mounting base 1, a cavity 5 is arranged in the center of the turntable table top 2, the piston assembly 4 is fixed in the cavity 5, a piston rod 401 of the piston assembly 4 penetrates through the cavity 5 and is fixedly connected with the clamping assembly 3, and the piston rod 401 can perform vertical feeding motion; the workpiece centering device further comprises a guide assembly which concentrically limits a plurality of axial points or axial segments on the piston rod 401 along the circumferential direction of the piston rod 401 so as to enable the piston rod 401 to move along a straight line.

The installation base 1 is fixed knot structure, and revolving stage mesa 2 is rotating part, and revolving stage mesa 2 is at horizontal surface internal rotation, and when revolving stage mesa 2 was rotatory, clamping subassembly 3 and piston assembly 4 synchronous revolution, clamping subassembly 3 is connected with piston rod 401, and when piston rod 401 made elevating movement, clamping subassembly 3 synchronous lift, and clamping subassembly 3 can carry out oscilaltion and two movements of horizontal rotation promptly.

The movement of the workpiece 6 along the Z axis is realized by the piston assembly 4, and the specific structure and the working principle of the piston assembly 4 are as follows: as shown in fig. 5-7, the through inner hole at the center of the turntable top 2 is a cavity 5, the piston assembly 4 is composed of a cylinder 402 and a piston rod 401, the outer circle of the cylinder 402 is positioned in the through inner hole and fixedly connected through a first screw 7, and the outer circle of the piston rod 401 is positioned in the inner hole of the cylinder 402 and can slide and feed on the inner hole. The center of the cylinder body 402 is a working cavity, the two ends of the cylinder body 402 are provided with an upper cavity air inlet channel 404 and a lower cavity air inlet channel 407 which are suitable for introducing compressed gas, a shoulder in the middle of the piston rod 401 divides the working cavity into an upper cavity 403 and a lower cavity 406 which are not communicated with each other inside the cylinder body 402, the upper cavity air inlet channel 404 is communicated with the lower cavity 406, and the upper cavity air inlet channel 404 is connected with an upper cavity air inlet pipe joint 405 and a lower cavity air inlet pipe joint 408 at the upper end of the cylinder body 402.

As shown in fig. 4, 6, and 7, when high-pressure gas is introduced into the lower cavity gas inlet joint 408, the high-pressure gas enters the lower cavity 406 through the lower cavity gas inlet passage 407, the high-pressure gas pushes the piston rod 401 to feed upwards, the piston rod 401 drives the clamping assembly 3 fixedly connected therewith to feed upwards together, and then the workpiece 6 positioned on the clamping assembly 3 feeds upwards until reaching the processing station.

As shown in fig. 4, 6, and 7, when high-pressure gas is introduced into the upper chamber gas inlet joint 405, the high-pressure gas enters the upper chamber 403 through the upper chamber gas inlet channel 404, the piston rod 401 is pushed by the high-pressure gas to feed downward, the piston rod 401 drives the clamping assembly 3 fixedly connected therewith to feed downward, and then the workpiece 6 positioned on the clamping assembly 3 is fed downward until the workpiece is separated from the processing station.

In this embodiment, the turntable table 2 is matched with the mounting base 1 to form a workpiece angle positioning assembly, the workpiece angle positioning assembly is actually a numerical control turntable directly driven by a torque motor, as shown in fig. 14 and 16, the turntable table 2 is driven by a rotor 11 and a stator 12 of the torque motor, the turntable table 2 is supported on the mounting base 1 through a main support bearing 13 and an auxiliary support bearing 14 of the turntable, an angle encoder 15 is used for online measuring and feeding back the angle position of the turntable table 2, and the torque motor is cooled by a cooling sleeve of the torque motor to control the temperature rise of the torque motor. Because the rotary table top 2 is directly driven by a torque motor, belongs to zero-clearance transmission driving, and adopts the high-precision angle encoder 15 to measure and feed back the angle of the rotary table top 2, the angle positioning precision of the rotary table top 2 is very high.

The guide assembly comprises at least two first guide structures 9 which are positioned in the cavity 5 and sleeved on the periphery of the piston rod 401, each first guide structure 9 comprises a guide unit mounting seat 901 and a guide sleeve bearing 902 which is sleeved between the guide unit mounting seat 901 and the piston rod 401, and the guide sleeve bearing 902 concentrically limits the axial section of the piston rod 401; the guide unit mount 901 is fixedly connected to the cylinder 402 of the piston assembly 4. The concentric limitation of the axial section means that the contact surface of the guide sleeve bearing 902 and the piston rod 401 is an annular cylindrical contact surface, so that the continuous limitation of the axial section on the piston rod 401 is realized, and the center of the guide sleeve bearing 902 extends along the axial direction of the piston rod 401 through the integral design of the guide sleeve bearing 902, so that the concentric limitation is realized.

The guide sleeve bearing 902 can adopt the following structure but is not limited to the following structure: the guide sleeve bearing 902 includes a bearing body 9021 and balls 9022, a plurality of rows of mutually-separated track grooves 9023 are circumferentially arranged on the inner circumferential surface of the bearing body 9021, a plurality of balls 9022 are arranged in each row of track grooves 9023, and the balls 9022 are in rolling contact with the piston rod 401.

In the present embodiment, as shown in fig. 3 to 8, two first guide structures 9 are provided, which are respectively fixed to the upper and lower ends of the cylinder 402, the guide sleeve bearing 902 is fixed in the inner hole of the guide unit mounting seat 901, the guide sleeve bearing 902 includes a plurality of rows of circularly rolling balls 9022 (usually 4 rows or 6 rows, 4 rows in the present embodiment) uniformly distributed in the circumferential direction, each row of balls 9022 has its own independent track groove 9023, and is separated from the other rows of balls 9022 without affecting each other. When the piston rod 401 feeds up and down, the inner hole of the bearing body 9021 is not in direct contact with the outer circle of the piston rod 401, and only the ball 9022 is in rolling contact with the outer circle of the piston rod 401, so that accurate guiding of the piston rod 401 during feeding up and down can be guaranteed, the friction resistance of the piston rod 401 during feeding up and down can be reduced, the guiding work is accurate and smooth, and meanwhile, the service lives of the first guiding structure 9 and the piston assembly 4 can be prolonged. First guide structure 9 sets up the upper and lower both sides at cylinder body 402 respectively, makes two first guide structure 9 spans increase, promotes direction effect and direction precision. In each guide sleeve bearing 902, a plurality of rows of balls 9022 are uniformly distributed, so that the first guide structure 9 has a self-centering function during guiding, the axis of the first guide structure 9 is concentric with the central shaft of the piston rod 401 all the time, and the guiding precision is improved.

The structure of the first guide structure 9 at the upper end of the cylinder 402 will be described in detail as follows: as shown in fig. 8 and 9, the guide unit mounting seat 901 is fixedly connected to the cylinder 402 by the second screw 8, the bearing body 9021 is fixedly connected to the guide unit mounting seat 901, the track groove 9023 is located on the inner periphery of the bearing body 9021, the track groove 9023 is open toward one end of the piston rod 401, the balls 9022 are located in the track groove 9023 and contact with the piston rod 401 through the open end of the track groove 9023, each row of balls 9022 has an independent track groove 9023 which is not affected by the balls 9022 in the other track grooves 9023, so that each row of balls 9022 can circularly roll in the respective track groove 9023 to ensure the consistency of the central axes, and the track grooves 9023 are cylindrical, and the balls 9022 are fully distributed in each track groove 9023, so that the bearings 902 contact with the piston rod 401 through the rows of balls 9022 to limit the center of a certain shaft section on the piston rod 401. The guide sleeve bearing 902 is sealed in the guide unit mounting seat 901, the lower end of the guide unit mounting seat 901 is inserted into an inner hole from the upper part of the cylinder body 402 and is sealed at the upper end of the working cavity, the outer circumferential surface of the guide unit mounting seat 901 and the inner circumferential surface of the cylinder body 402 are sealed through an O-shaped sealing ring 903, the inner circumferential surface of the guide unit mounting seat 901 and the outer circumferential surface of the piston rod 401 are sealed through a sliding sealing ring 904, and the upper end of the guide unit mounting seat 901 is axially pressed against the top of the bearing body 9021 through an elastic retaining ring 905 for a hole.

The first guide structure 9 in this embodiment can prevent the piston rod 401 from deviating in the X-axis direction and the Y-axis direction of the machine tool when it is positioned in the vertical feeding direction.

Example two:

on the basis of the first embodiment, the guide assembly further comprises two second guide structures 10 fixed above the turntable top 2, each second guide structure 10 comprises a guide base 1001 and a guide bearing with a handle 1002, and the guide bearings with the handle 1002 of the two second guide structures 10 are arranged on the circumferential side surface of the piston rod 401 along the Y axis and are in rolling contact with the piston rod 401. The Y-axis direction is parallel to the extending and retracting direction of the clamping tip 1702, and the center of the end surface of the positioning end clamping tip 1701 is the mechanical zero point of the machine tool, so the second guide structure 10 can be used to attach the workpiece 6 to the end surface of the positioning end clamping tip 1701, and accurately position the workpiece to the mechanical zero point.

As shown in fig. 1 and 4, two second guide structures 10 are respectively disposed on two sides of a piston rod 401, the second guide structures 10 are in rolling contact with the piston rod 401 through handle-mounted guide bearings 1002, two guide bases 1001 are respectively disposed on two sides of the piston rod 401 along an X-axis direction, one handle-mounted guide bearing 1002 is mounted on one side of each guide base 1001, the two handle-mounted guide bearings 1002 are respectively disposed on two sides of the piston rod 401 along a Y-axis direction, in order to improve a guide effect, it is preferable that a milling flat surface 4011 in contact fit with the handle-mounted guide bearings 1002 be disposed on the piston rod 401, and a length of the milling flat surface 4011 is greater than a feeding stroke of the piston rod 401. Two milling flat surfaces 4011 are designed on two sides of an outer circle of the upper end of a piston rod 401, the length of the two milling flat surfaces 4011 needs to be slightly larger than the stroke of the piston rod 401 in vertical feeding, and the guide bearing with the handle 1002 is always in rolling contact with the milling flat surfaces 4011, so that the design can ensure that the piston rod 401 is accurately guided in vertical feeding and can reduce the friction resistance caused by vertical feeding of the piston, and in order to ensure that the guide bearing with the handle 1002 is in contact with the milling flat surfaces 4011, a kidney-shaped mounting hole 10011 is formed in a guide base 1001 to adjust the front and back positions (namely the positions in the X-axis direction) of the guide bearing with the handle 1002. The second guide structure 10 is an auxiliary guide unit as compared with the first guide structure 9, and the second guide structure 10 works together with the first guide structure 9 to further improve the guide accuracy, and prevent the deviation in the X-axis direction of the machine tool and the deviation in the Y-axis direction of the machine tool when the whole guide unit is fed and positioned in the up-down direction.

As shown in fig. 1 and 4, the two second guide structures 10 have another function, when the piston rod 401 is fed up and down under the action of hydraulic oil pressure, the two symmetrically arranged second guide structures 10 are matched with the milling flat surfaces 4011 symmetrically arranged on the piston rod 401, so that the anti-rotation function of the piston rod 401 can be realized while axial rolling guide is realized, the piston rod 401 is prevented from rotating in the circumferential direction during axial feeding to influence the positioning and clamping of the workpiece 6, and the guide precision and the guide effect are improved.

Example three:

on the basis of the first embodiment or the second embodiment, the clamping assembly 3 may adopt, but is not limited to, the following structure: the clamping device comprises a positioning seat 301 connected with a piston rod 401 and a V-shaped block 302 fixed with the positioning seat 301, wherein the top of the V-shaped block 302 is provided with a V-shaped opening suitable for clamping a workpiece 6; the V-shaped block 302 is further provided with a waist-shaped hole 303, the waist-shaped hole 303 extends along the vertical direction, and a screw penetrates through the waist-shaped hole 303 to fixedly connect the V-shaped block 302 with the positioning seat 301. The V-shaped positioning block is micro-adjusted in the vertical position by a waist-shaped hole 303 formed in the V-shaped block 302. The angular position of the workpiece 6 can be accurately maintained by driving the turntable table 2 so that the workpiece 6 is brought into contact with the end surface of the V-block 302 facing the positioning end clamping center 1701, and the workpiece 6 needs to be accurately positioned to the mechanical zero point by further fine adjustment in the X-axis direction and the Z-axis direction because of slight dimensional variations between the workpieces 6.

During adjustment, the workpiece 6 is initially positioned in the vertical direction by the first guide structure 9, the workpiece 6 is pushed to a preset position, the difference between the vertical direction of the workpiece 6 and the mechanical zero point of the machine tool (the mechanical zero point is the center of the end face of the positioning end clamping center 1701) is measured, and the V-block 302 is finely adjusted according to the difference to feed the workpiece 6 to the correct zero point position, so that the vertical position of the workpiece 6 is adjusted to the proper position. The V-shaped block 302 only needs to be adjusted when the workpiece 6 is positioned in the vertical direction for the first time after being replaced, the V-shaped block 302 does not need to be adjusted after the adjustment is completed for the first time, and the vertical positioning can be achieved through automatic vertical feeding of the piston assembly 4 when the workpiece is ground again, so that manual operation does not need to be participated.

For fine adjustment in the X-axis direction, the fine adjustment is realized through the following structure: a fine adjustment unit is further connected between the positioning seat 301 and the piston rod 401, the fine adjustment unit includes a fine adjustment mounting seat 304 and a wedge-shaped positioning block 305, a dovetail groove 3011 is arranged at the bottom of the positioning seat 301, the dovetail groove 3011 extends through along the X axis, a single-side dovetail boss 3041 is arranged at the top of the fine adjustment mounting seat 304, and the single-side dovetail boss 3041 and the wedge-shaped positioning block 305 are arranged side by side and clamped together in the dovetail groove 3011. Dovetail 3011 at the bottom of positioning seat 301 is an improved adjusting track for fine adjustment mount 304, and at the same time, both sides of dovetail 3011 are inclined surfaces, which can apply pressure to fine adjustment mount 304, and play a role in compressing fine adjustment mount 304. The single-side dovetail boss 3041 means that one side of the single-side dovetail boss 3041 is an inclined surface, and is attached to one side surface of the dovetail slot 3011, and the other side of the single-side dovetail boss 3041 is not attached to the other side surface of the dovetail slot 3011.

As shown in fig. 4 and 17, fine adjustment mounting seat 304 is connected with piston rod 401 in the following manner: the bottom of the fine tuning mounting seat 304 is provided with a transition connecting seat 306, the fine tuning mounting seat 304 is positioned with the end surface of the transition connecting seat 306 by a positioning pin assembly 307, and then is fixedly connected to the transition connecting seat 306 by a third screw 308. The lower part of the transition connecting base 306 is sleeved on the outer periphery of the piston rod 401, and is positioned with the outer periphery of the piston rod 401 through a positioning flat key 309, and then is fixed on the upper end surface of the piston rod 401 through a fourth screw 310. The positioning seat 301 is positioned on a single-side dovetail boss 3041 arranged at the top of the fine adjustment mounting seat 304 through a dovetail groove 3011 and a wedge-shaped positioning block 305, which are arranged at the bottom in a penetrating manner, two penetrating threaded holes 3012 are arranged at the top of the positioning seat 301, and two locking screws downwards support the wedge-shaped positioning block 305 through the two threaded holes 3012, so that the wedge-shaped positioning block 305 is attached and clamped on a guide rail surface of the dovetail groove 3011, and the positioning and locking of the positioning seat 301 are realized. The top surface of the single-side dovetail boss 3041 is provided with a scale for uniform scribing, the position of the positioning seat 301 along the X-axis direction can be accurately read through the scale, the difference between the X-axis direction of the workpiece 6 and the mechanical zero point of the machine tool is measured, the positioning seat 301 is adjusted to the correct position according to the difference, and then the locking screw is locked. The fine adjustment unit is also used when the position of the V-shaped block 302 is adjusted for the first time, and when the V-shaped block is ground again later, the fine adjustment unit does not need to be adjusted manually.

Example four:

on the basis of the first embodiment, the second embodiment or the third embodiment, the workpiece centering device further comprises a stroke measuring unit 16, wherein the stroke measuring unit 16 comprises a signaling rod 1601 fixedly connected with the bottom of the piston rod 401, and a first photoelectric switch 1602 and a second photoelectric switch 1603 fixedly connected with the mounting base 1; the signalling rod 1601 is provided with a first signalling boss 16011 and a second signalling boss 16012 located below the first signalling boss 16011, and when the first signalling boss 16011 triggers the first photoelectric switch 1602, the piston rod 401 reaches a lower limit position; when the second signalling boss 16012 triggers the second opto-electronic switch 1603, the piston rod 401 reaches the upper limit position.

As shown in fig. 3, the lower end surface of the piston rod 401 is provided with a threaded hole, and the stroke measuring unit 16 is positioned and connected to the lower end surface of the piston rod 401 through an external thread at the top end of the signalling rod 1601. The middle part of the signalling rod 1601 is provided with a first signalling boss 16011, the lower part is provided with a second signalling boss 16012, the photoelectric switch mounting bracket 1604 fixedly connected with the mounting base 1 is provided with a first photoelectric switch 1602 and a second photoelectric switch 1603, and the first photoelectric switch 1602 is positioned above the second photoelectric switch 1603. When the piston rod 401 is fed downwards to the limit position, the upper first communication boss 16011 triggers the upper first photoelectric switch 1602, and the first photoelectric switch 1602 sends a signal to the numerical control system, which indicates that the piston rod 401 reaches the lower limit position, and at this time, the workpiece 6 is retracted downwards to a preset position; when the piston rod 401 is fed upwards to the extreme position, the second underlying signalling boss 16012 triggers the second underlying opto-electronic switch 1603, which signals to the numerical control system that the piston rod 401 reaches the upper extreme position, at which time the workpiece 6 is fed upwards to the predetermined position.

Example five:

a peripheral grinding machine comprising a workpiece centering device as described above, and a workpiece clamping unit 17 secured to a table top 2 of the turret, said workpiece clamping unit 17 having a locating end clamping point 1701 and a clamping end clamping point 1702, a machining station being located between the locating end clamping point 1701 and the clamping end clamping point 1702, said workpiece centering device being adapted to deliver a workpiece 6 to said machining station.

As shown in fig. 10-14, work piece clamping unit 17 presss from both sides tight work piece 6 along the X-axis direction, the utility model discloses a work piece clamping unit 17 is prior art, no longer provide the detailed drawing here, only make brief text introduction, work piece clamping unit 17 comprises the locating component that is located the right side and the clamping component that is located left, locating component contains location ejector pin and location push rod 1703, the location ejector pin is fixed part, the location ejector pin is passed to the front end of location push rod 1703, location push rod 1703 is used for fixing a position foraminiferous work piece 6, by pneumatic control, pneumatic switching-over valve action when needing the location, location push rod 1703 stretches out from the hole of location ejector pin under the atmospheric pressure effect, pneumatic switching-over valve reverse action when not needing the location, location push rod 1703 moves back to the hole of location ejector pin in under the spring force effect that resets. The clamping assembly comprises a clamping ejector rod, a lever and a hydraulic cylinder, the clamping ejector rod and the hydraulic cylinder are respectively hinged to two ends of the lever, the telescopic motion of the hydraulic cylinder is converted into reciprocating motion of the clamping ejector rod by utilizing the principle of a boosting lever, a positioning end clamping tip 1701 is the end part of the positioning ejector rod, a clamping end tip is the end part of the clamping ejector rod, the positioning end clamping tip 1701 is fixed, and a clamping end clamping tip 1702 moves along the Y axis through hydraulic control.

When the workpiece 6 has a center hole, after the workpiece centering device completes coarse positioning of the workpiece 6 (including angle positioning and positioning in three coordinate axis directions), the positioning push rod 1703 extends into the positioning hole of the workpiece 6 along the inner hole of the positioning push rod under pneumatic control to complete accurate positioning, and then the clamping end clamping tip 1702 clamps the workpiece 6 under the hydraulic action. After the workpiece 6 is clamped, the piston rod 401 retracts to the lower limit position under the control of air pressure to stand by.

When the workpiece 6 has no central hole, after the workpiece centering device finishes positioning the workpiece 6, the positioning push rod retracts into the positioning hole along the inner hole of the positioning push rod under pneumatic control to wait, and then the clamping end clamping tip 1702 clamps the workpiece 6 under the hydraulic action. After the workpiece 6 is clamped, the piston rod 401 retracts to the lower limit position under the control of air pressure to stand by.

In order to improve the positioning accuracy, in a further design of this embodiment, the peripheral grinding machine is further provided with a position on-line detection unit 18, the position on-line detection unit 18 includes a position detection sensor 1801 and a mounting bracket 1802, as shown in fig. 15, a screw of the position detection sensor 1801 is connected in a hole of the mounting bracket 1802, and is locked at an outer side of the mounting bracket 1802 by a limit lock nut 1803, a front end of the position detection sensor 1801 is guided to extend and retract by a guide support bracket 1804, a measurement head of the position detection sensor 1801 is pneumatically controlled, when pressure air is introduced into the position detection sensor 1801, the measurement head extends forward to a measurement position along the guide support bracket 1804, and when an air unloading pressure chamber in the position detection sensor 1801 is unloaded, the measurement head is reset under the action of a spring force and retracts to a waiting position along the guide support bracket 1804.

The position on-line detection unit 18 can detect the following positions of the workpiece 6 on line:

1) the difference between the position of the workpiece 6 in the left-right direction (Y-axis direction) of the machine tool and the position of the zero point of the workpiece 6 in the left-right direction of the machine tool.

2) The difference between the position of the workpiece 6 in the machine tool front-rear direction (X-axis direction) and the position of the workpiece 6 front-rear direction zero point of the machine tool.

3) The difference between the position of the workpiece 6 in the vertical direction (Z-axis direction) and the position of the zero point of the workpiece 6 in the vertical direction of the machine tool.

4) The position of the angular position of the workpiece 6 (the angular position in the horizontal plane) and the position of the zero point in the angular direction of the machine tool.

Example six:

a method for adjusting the positioning and centering of a workpiece, which uses the above-mentioned peripheral grinding machine, comprising the steps of:

s1: the piston assembly 4 is used to push the workpiece 6 to the machining station along the axial direction of the piston rod 401.

S2: the table top 2 of the rotary table is horizontally rotated to adjust the angle of the workpiece 6.

S3: the clamping end clamping center 1702 clamps the workpiece 6, and the workpiece 6 is clamped.

The specific operation steps of S1 are as follows:

the lower cavity 406 of the piston assembly 4 is filled with pressure air, and the piston rod 401 is fed upwards to drive the workpiece 6 positioned in the V-shaped block 302 to a rough positioning station of the workpiece 6.

The specific operation steps of S2 are as follows:

the position online detection unit 18 detects the position of the angular position of the workpiece 6 (the angular position of the machine tool in the horizontal plane), compares the position with the zero point of the angular position, obtains the angular deviation of the workpiece 6 in the numerical control system, the numerical control system sends a workpiece 6 angle adjustment instruction to the workpiece angle positioning assembly according to the angular deviation of the workpiece 6, the workpiece angle positioning assembly adjusts the angle of the workpiece 6 to the correct position according to the instruction, and the workpiece angle positioning assembly is adjusted completely.

When the workpiece 6 is initially clamped and adjusted, after the two steps, the following fine adjustment steps are required:

first, the position on-line detecting unit 18 detects the position of the workpiece 6 in the vertical direction, compares the detected position with the vertical zero point of the machine tool, obtains the vertical position deviation of the workpiece 6 in the numerical control system, displays the deviation value on the display, then releases the screw on the V-block 302, and adjusts the V-block 302 up and down so that the blade coincides with the vertical zero point of the machine tool.

Next, the position on-line detecting unit 18 detects the position of the blade in the front-rear direction (X-axis direction of the machine tool), compares the detected position with the X-axis zero point, obtains the X-axis positional deviation of the workpiece 6 in the numerical control system, displays the deviation on the display, releases the lock screw at the top of the positioning seat 301, and manually adjusts the front-rear direction position of the workpiece 6 to the correct position based on the deviation value.

The specific operation process of S3 is as follows:

firstly, checking whether the workpiece 6 is provided with a central hole, if the workpiece 6 is not provided with the central hole, the positioning push rod 1703 of the workpiece clamping unit 17 retracts to a waiting position under pneumatic control, then the clamping end clamping tip 1702 clamps the workpiece 6 under hydraulic action, and after the workpiece 6 is clamped, the piston rod 401 retracts to a lower limit position under pneumatic control for waiting; if the workpiece 6 is provided with a central hole, the positioning push rod 1703 of the workpiece clamping unit 17 extends into the positioning hole of the workpiece 6 along the inner hole of the positioning push rod under pneumatic control to complete accurate positioning, then the clamping end clamping tip 1702 clamps the workpiece 6 under hydraulic action, and after the workpiece 6 is clamped, the piston rod 401 retracts to the lower limit position under pneumatic control to stand by.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (9)

1. A workpiece centering device, characterized by: comprises a mounting base (1), a turntable table-board (2), a clamping assembly (3) and a piston assembly (4); the turntable table top (2) is erected on the mounting base (1) and is rotatably connected with the mounting base (1), a cavity (5) is formed in the center of the turntable table top (2), the piston assembly (4) is fixed in the cavity (5), a piston rod (401) of the piston assembly (4) penetrates through the cavity (5) and is fixedly connected with the clamping assembly (3), and the piston rod (401) can perform vertical feeding motion;

the workpiece centering device further comprises a guide assembly, and the guide assembly concentrically limits a plurality of axial points or axial sections on the piston rod (401) along the circumferential direction of the piston rod (401) so that the piston rod (401) can move along a straight line.

2. The workpiece centering device of claim 1, wherein: the guide assembly comprises at least two first guide structures (9) which are positioned in the cavity (5) and sleeved on the periphery of the piston rod (401), each first guide structure (9) comprises a guide unit mounting seat (901) and a guide sleeve bearing (902) which is sleeved between the guide unit mounting seat (901) and the piston rod (401), and the guide sleeve bearing (902) concentrically limits the axial section of the piston rod (401); the guide unit mounting seat (901) is fixedly connected with a cylinder body (402) of the piston assembly (4).

3. The workpiece centering device of claim 2, wherein: the guide sleeve bearing (902) comprises a bearing body (9021) and balls (9022), wherein multiple rows of mutually-separated track grooves (9023) are circumferentially arranged on the inner circumferential surface of the bearing body (9021), a plurality of balls (9022) are arranged in each row of track grooves (9023), and the balls (9022) are in rolling contact with the piston rod (401).

4. The workpiece centering device of claim 1, wherein: the guide assembly further comprises two second guide structures (10) fixed above the turntable table top (2), each second guide structure (10) comprises a guide base (1001) and a guide bearing with a handle (1002), and the guide bearings with the handle (1002) of the two second guide structures (10) are arranged on two circumferential sides of the piston rod (401) along the Y axis and are in rolling contact with the piston rod (401).

5. The workpiece centering device of claim 4, wherein: the piston rod (401) is provided with a milling flat surface (4011) in contact fit with the guide bearing with the handle (1002), and the length of the milling flat surface (4011) is larger than the feeding stroke of the piston rod (401).

6. The workpiece centering device of claim 4, wherein: the clamping assembly (3) comprises a positioning seat (301) connected with the piston rod (401) and a V-shaped block (302) fixed with the positioning seat (301), and a V-shaped opening suitable for clamping a workpiece (6) is formed in the top of the V-shaped block (302); the V-shaped block (302) is further provided with a waist-shaped hole (303), the waist-shaped hole (303) extends in the vertical direction, and a screw penetrates through the waist-shaped hole (303) to enable the V-shaped block (302) to be fixedly connected with the positioning seat (301).

7. The workpiece centering device of claim 6, wherein: the fine adjustment unit is further connected between the positioning seat (301) and the piston rod (401), the fine adjustment unit comprises a fine adjustment mounting seat (304) and a wedge-shaped positioning block (305), a dovetail groove (3011) is formed in the bottom of the positioning seat (301), the dovetail groove (3011) runs through and extends along an X axis, a single-side dovetail boss (3041) is arranged at the top of the fine adjustment mounting seat (304), and the single-side dovetail boss (3041) and the wedge-shaped positioning block (305) are arranged side by side and are clamped in the dovetail groove (3011) together.

8. The workpiece centering device of claim 1, wherein: the workpiece centering device further comprises a stroke measuring unit (16), wherein the stroke measuring unit (16) comprises a signaling rod (1601) fixedly connected with the bottom of the piston rod (401), and a first photoelectric switch (1602) and a second photoelectric switch (1603) fixedly connected with the mounting base (1);

the signalling rod (1601) is provided with a first signalling boss (16011) and a second signalling boss (16012) located below the first signalling boss (16011), and when the first signalling boss (16011) triggers the first photoelectric switch (1602), the piston rod (401) reaches a lower limit position; when the second signalling boss (16012) triggers the second opto-electronic switch (1603), the piston rod (401) reaches an upper limit position.

9. A peripheral grinding machine, characterized by: comprising a workpiece centering device according to any one of claims 1 to 8, and a workpiece clamping unit (17) secured to the turntable table top (2), the workpiece clamping unit (17) having a locating end clamping point (1701) and a clamping end clamping point (1702), a machining station being located between the locating end clamping point (1701) and the clamping end clamping point (1702), the workpiece centering device being adapted to transport the workpiece (6) to the machining station.

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