CN110605589A

CN110605589A - Positioning jig, combination of positioning jig and multi-axis machining machine and positioning precision detection method

Info

Publication number: CN110605589A
Application number: CN201810623589.9A
Authority: CN
Inventors: 李龙
Original assignee: Jeep Electronics (singapore) Co
Current assignee: Jeep Electronics (singapore) Co
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2019-12-24
Anticipated expiration: 2038-06-15
Also published as: CN110605589B

Abstract

A positioning fixture and a combination of the positioning fixture and a multi-axis processing machine and a positioning precision detection method are provided, the positioning fixture comprises a bearing frame, a lifting mechanism, a pressing mechanism, a supporting module and a rotary driving mechanism, the lifting mechanism is arranged on the bearing frame, the pressing mechanism comprises a rotary shaft, a rotary disc and a pressing module, one of the bearing frame and the rotary disc comprises at least one first positioning part, the other of the bearing frame and the rotary disc comprises a plurality of second positioning parts, the lifting mechanism is used for driving the pressing mechanism to move between a clamping position and a release position along the axial direction of the rotary shaft, when the first positioning part is at the clamping position, the first positioning part is clamped with the corresponding second positioning part, when the first positioning part is released from the second positioning part, the first positioning part is separated from the corresponding second positioning part, and the rotation driving mechanism drives the pressing mechanism to rotate about the axial direction of the rotating shaft so as to align the other one of the second positioning portions with the first positioning portion.

Description

Positioning jig, combination of positioning jig and multi-axis machining machine and positioning precision detection method

Technical Field

The present invention relates to a positioning jig, and more particularly to a positioning jig used for a machining tool to clamp and position a workpiece, a combination of the positioning jig and a multi-axis machining machine, and a method for detecting a positioning accuracy of the positioning jig.

Background

In the field of Computer Numerical Control (CNC) machining, a cylinder is usually used in conjunction with a four-axis machine to machine multiple surfaces of a workpiece to be machined. The price of the cylinder is high, so that the purchasing cost is high. In addition, the cylinder controls the stroke of the piston rod by adjusting the distance of the limit bolt, and further controls the angle of the piston rod driving the chuck to rotate. However, after the air cylinder is used for a long time, the limit bolt is easy to loosen due to abrasion, so that an error occurs in the moving stroke of the piston rod, and an error also occurs in the angle for driving the chuck to rotate and position by the piston rod, so that the accuracy for driving the workpiece to be processed to rotate and position by the chuck is reduced, and the processing accuracy of the workpiece to be processed is further influenced.

Disclosure of Invention

An object of the present invention is to provide a positioning jig, which can reduce the manufacturing cost.

Another objective of the present invention is to provide a positioning fixture, which can achieve high-precision positioning of a workpiece to be processed.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme, and the positioning jig provided by the invention is suitable for clamping and positioning the workpiece.

The positioning jig comprises a bearing frame, a lifting mechanism, a pressing mechanism, a supporting module and a rotary driving mechanism, wherein the lifting mechanism is arranged on the bearing frame, the pressing mechanism comprises a rotating shaft which is rotatably pivoted on the lifting mechanism, a rotating disk which is fixedly arranged on the rotating shaft and bears the supporting module, and the pressing module which is used for pressing the supporting module to be positioned on the rotating disk, the supporting module is used for supporting the workpiece, one of the bearing frame and the rotating disk comprises at least one first positioning part, the other of the bearing frame and the rotating disk comprises a plurality of second positioning parts which are arranged at equal angles at intervals, the first positioning parts are used for clamping the corresponding second positioning parts, the lifting mechanism is used for driving the pressing mechanism to move between a clamping position and a releasing position along the axial direction of the rotating shaft, when the pressing mechanism is in the release position, the first positioning portion is clamped with the corresponding second positioning portion, and when the pressing mechanism is in the release position, the first positioning portion is separated from the corresponding second positioning portion, and the rotary driving mechanism drives the pressing mechanism to rotate around the axial direction of the rotating shaft, so that the other second positioning portion in the second positioning portion is aligned with the first positioning portion.

In some embodiments, the first positioning portion is a positioning block, and the second positioning portion is formed with a positioning slot for the first positioning portion to engage.

In some embodiments, the first positioning portion has two inclined first inclined surfaces, the second positioning portion has two inclined second inclined surfaces, and the two inclined second inclined surfaces are respectively abutted by the first inclined surfaces, and define the positioning slot.

In some embodiments, the first positioning portion has a first semi-circular arc surface, the second positioning portion has a second semi-circular arc surface against which the first semi-circular arc surface abuts, and the second semi-circular arc surface defines the positioning slot.

In some embodiments, the bearing plate includes a bearing plate for bearing the rotating disc, and the first positioning portion is disposed on the bearing plate, and the rotating disc includes the second positioning portion.

In some embodiments, the first positioning portion is integrally formed on the carrier plate.

In some embodiments, the bearing plate has a top surface, the top surface is recessed to form a slot for the first positioning portion to engage, and the bearing frame includes a locking screw passing through the first positioning portion and screwed to the bearing plate.

In some embodiments, two adjacent second positioning portions of the second positioning portions are perpendicular to each other, and the carrier includes a plurality of first positioning portions, two adjacent first positioning portions of the first positioning portions being perpendicular to each other.

In some embodiments, the carrier further comprises a plate, and a plurality of spacers disposed between the plate and the carrier, the flat plate is provided with a first through hole, the rotating shaft comprises a shaft rod penetrating through the first through hole and a key arranged on the shaft rod, the rotary driving mechanism comprises a rotary driving part arranged on the flat plate, a first gear which is positioned on the flat plate and can be driven by the rotary driving part to rotate, and a second gear which is sleeved on the rotating shaft rod and meshed with the first gear, the second gear is positioned between the flat plate and the bearing plate and is provided with a key groove for clamping the key, the height of the release position is higher than that of the clamping position, in the detent position, the key is separated from the key slot, and in the release position, the key is detent in the key slot.

In some embodiments, the pressing module comprises a cylinder body, and a clamping rod disposed at a top end of the cylinder body, the shaft rod is fixedly disposed at the top end of the cylinder body and is formed with a shaft hole, and the clamping rod penetrates through the shaft hole, the supporting module and the workpiece to press the supporting module to the rotating disk.

In some embodiments, the rotating disc includes a plurality of positioning pins, the support module includes a support plate for supporting the workpiece, and a plurality of bolts, the support plate is formed with a plurality of positioning holes for the positioning pins to engage with, respectively, the bolts are inserted through the support plate and screwed to the rotating disc.

In some embodiments, the rotating shaft includes a shaft penetrating through the bearing frame, and a key disposed on the shaft, the rotating driving mechanism includes a rotating driving member disposed on the bearing frame, a first gear capable of being driven by the rotating driving member to rotate, and a second gear sleeved on the shaft and engaged with the first gear, the second gear forms a key slot for the key to be engaged, the key is separated from the key slot in the engaged position, and the key is engaged in the key slot in the released position.

The positioning fixture comprises a supporting module, a rotating shaft, a rotating disc, a bearing frame and a rotating driving mechanism, the support module is used for supporting the workpiece, the rotating disc is used for fixing the support module, the carrier includes a plurality of first positioning portions arranged at intervals, one surface of the rotating disk facing the carrier includes a plurality of second positioning portions arranged at intervals corresponding to the first positioning portions, when the rotating disc is at the clamping position, the first positioning part is clamped on the corresponding second positioning part, so that the rotating disc together with the support module and the workpiece is fixedly arranged on the bearing frame, when the rotating disc is at the release position, the first positioning part is separated from the corresponding second positioning part, and the rotating driving mechanism drives the rotating shaft to drive the rotating disc to rotate, so that the second positioning parts can be aligned to the first positioning parts different from the clamping position.

The positioning jig comprises a supporting module, a rotating disc and a bearing frame, wherein the supporting module is used for supporting the workpiece, the rotating disc is used for fixing the supporting module, the bearing frame comprises at least one first positioning part, the first positioning part is provided with two inclined first inclined planes, one surface, facing the bearing frame, of the rotating disc comprises at least one second positioning part corresponding to the first positioning part, the second positioning part is provided with two inclined second inclined planes, the two inclined second inclined planes are respectively used for abutting the first inclined planes in operation, and when the rotating disc is in a clamping position, the first positioning part is clamped in the second positioning part, the first inclined planes abut against the second inclined planes, so that the rotating disc, the supporting module and the workpiece are fixedly arranged on the bearing frame.

The positioning jig comprises a supporting module, a rotating disc and a bearing frame, wherein the supporting module is used for supporting the workpiece, the rotating disc is used for fixing the supporting module, the bearing frame comprises a plurality of first positioning parts or second positioning parts which are arranged at intervals, a face of the rotating disk facing the carrier includes the other of the plurality of first positioning portions or the plurality of second positioning portions, each first positioning part is a clamping block with two inclined first inclined surfaces, each second positioning part is provided with a positioning clamping groove and two inclined second inclined surfaces which are inclined and are respectively abutted against the first inclined surfaces in operation, when the rotating disc is at the clamping position, each first positioning part is clamped in the corresponding positioning clamping groove of each second positioning part, so that the rotating disc together with the support module and the workpiece is fixedly arranged on the bearing frame.

Another objective of the present invention is to provide a combination of a positioning fixture and a multi-axis processing machine, wherein the positioning fixture has a low manufacturing cost and can achieve high-precision positioning of a workpiece to be processed.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme, and the combination of the positioning jig and the multi-axis machining machine table provided by the invention is suitable for clamping and positioning the workpiece.

The positioning jig comprises a bearing frame, a lifting mechanism, a pressing mechanism, a supporting module and a rotary driving mechanism, wherein the bearing frame is assembled on the multi-axis processing machine table, the lifting mechanism is arranged on the bearing frame, the pressing mechanism comprises a rotating shaft which is rotatably pivoted on the lifting mechanism, a rotating disc which is fixedly arranged on the rotating shaft and bears the supporting module, and a pressing module which is used for pressing the supporting module to be positioned on the rotating disc, the supporting module is used for supporting the workpiece, one of the bearing frame and the rotating disc comprises at least one first positioning part, the other of the bearing frame and the rotating disc comprises a plurality of second positioning parts which are arranged at equal angles at intervals, the first positioning parts are used for clamping corresponding second positioning parts, the lifting mechanism is used for driving the pressing mechanism to move between a clamping position and a release position along the axial direction of the rotating shaft, when the pressing mechanism is in the release position, the first positioning portion is clamped with the corresponding second positioning portion, and when the pressing mechanism is in the release position, the first positioning portion is separated from the corresponding second positioning portion, and the rotary driving mechanism drives the pressing mechanism to rotate around the axial direction of the rotating shaft, so that the other second positioning portion in the second positioning portion is aligned with the first positioning portion.

In some embodiments, the bearing frame includes a bearing frame body and a guiding and positioning frame body, the bearing frame body includes a vertical plate locked to the multi-axis processing machine, and a flat plate perpendicular to the vertical plate, the guiding and positioning frame body is disposed on the flat plate and includes the first positioning portion, the first positioning portion is a positioning fixture block, the rotating disk includes the second positioning portion, and the second positioning portion is formed with a positioning fixture slot for the first positioning portion to clamp.

Another objective of the present invention is to provide a method for detecting the positioning accuracy of a positioning fixture, which can conveniently and quickly detect the positioning accuracy to meet the required positioning accuracy requirement.

The purpose of the invention and the technical problem of solving the background are realized by adopting the following technical scheme, and the positioning precision detection method of the positioning jig provided by the invention comprises the following steps:

aligning the alignment mark of a rotating disc to a mark of a bearing frame, wherein the bearing frame comprises a plurality of first positioning parts which are equally spaced at intervals, and the rotating disc comprises a plurality of second positioning parts which are equally spaced at intervals;

the rotating disc is driven to move downwards to a clamping position, so that the first positioning parts are clamped in the positioning clamping grooves of the second positioning parts respectively;

marking points at the same positions of a plurality of first ring surfaces which are arranged at equal angles at intervals;

measuring the vertical distance between the marking point and the Z-direction detection reference surface of the bearing frame to obtain a plurality of height sizes measured for the first time;

driving the rotating disc to move upwards to a release position, so that the first positioning part is separated from the positioning clamping grooves of the second positioning part respectively;

the rotating disc is driven to rotate by 90 degrees, so that the second positioning parts are aligned to the first positioning parts which are different from the clamping positions;

driving the rotating disc to move downwards to the clamping position, so that the first positioning parts are clamped in the positioning clamping grooves of the second positioning parts respectively;

measuring the vertical distance between the marking point and the Z-direction detection reference surface to obtain a plurality of height sizes measured for the second time; and

comparing the height dimension of the first measurement to the height dimension of the second measurement.

marking two marking points on two side edges of a plurality of second ring surfaces which are arranged at equal angles and intervals respectively to obtain a plurality of first marking points which are spaced from the Y-direction detection reference surface of the bearing frame and a plurality of second marking points which are spaced from the X-direction detection reference surface of the bearing frame;

measuring the vertical distance between the first marking point and the Y-direction detection reference surface to obtain a plurality of Y-direction sizes measured for the first time at a first angle, and measuring the vertical distance between the second marking point and the X-direction detection reference surface to obtain a plurality of X-direction sizes measured for the first time at the first angle;

measuring the vertical distance between the first marking point and the X-direction detection reference surface after rotation to obtain a plurality of X-direction sizes measured for the first time at a second angle, and measuring the vertical distance between the second marking point and the Y-direction detection reference surface to obtain a plurality of Y-direction sizes measured for the first time at the second angle; and

comparing the Y-direction dimension measured for the first time at the first angle with the Y-direction dimension measured for the first time at the second angle, and comparing the X-direction dimension measured for the first time at the first angle with the X-direction dimension measured for the first time at the second angle.

The invention has the beneficial effects that: the positioning jig can reduce the processing and manufacturing cost and can achieve the high-precision positioning of the workpiece to be processed.

Drawings

Fig. 1 is a perspective view of a positioning fixture assembled on a four-axis processing machine according to a first embodiment of the present invention;

fig. 2 is a front view of fig. 1, illustrating the pressing mechanism at a locking position, wherein a plurality of first positioning portions are respectively locked to a plurality of second positioning portions;

FIG. 3 is an exploded perspective view of the first embodiment and a workpiece, illustrating the assembly relationship between the workpiece, the carrier, the lifting mechanism, the pressing mechanism, the support module, and the rotary drive mechanism;

FIG. 4 is a cross-sectional view of the first embodiment illustrating the assembled relationship between the workpiece, the carrier, the lift mechanism, the pressing mechanism, the support module, and the rotary drive mechanism;

FIG. 5 is a fragmentary exploded perspective view of the guiding and positioning frame of the first embodiment, illustrating the assembly relationship between the carrier plate, the first positioning portions, and the locking screws;

FIG. 6 is a fragmentary front view of the guide nest of the first embodiment illustrating the first detent engaging in a nest of the additional circuit board;

FIG. 7 is an exploded perspective view of the support bracket and the pressing mechanism of the first embodiment illustrating the assembled relationship between the support bracket, pressing module, rotating shaft, two bearings, and rotating disk;

FIG. 8 is a front view of the rotary disk of the first embodiment;

FIG. 9 is a sectional view of the pressing mechanism of the first embodiment, illustrating the assembled relationship between a plurality of pins, the rotary shaft, and the rotary disk;

FIG. 10 is a fragmentary top plan view of the first embodiment illustrating the first gear meshing with the second gear;

FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 10, illustrating the key of the rotating shaft being disengaged from the keyway of the second gear and the key being located in a first slot portion of the first bore when the hold-down mechanism is in the detent position;

fig. 12 is a fragmentary side view of the first embodiment, illustrating the lifting mechanism driving the pressing mechanism to move upward to a release position, so that the second positioning portions are separated from the first positioning portions, respectively;

FIG. 13 is a cross-sectional view similar to FIG. 11, illustrating the key being captured within the keyway when the hold-down mechanism is in the released position;

FIG. 14 is a fragmentary top view similar to FIG. 10, illustrating the first gear rotating the second gear to rotate the rotating shaft;

fig. 15 is a front view of the first embodiment, illustrating that the second positioning portions are respectively aligned with the first positioning portions after the rotating shaft rotates the rotating disc;

FIG. 16 is a fragmentary cross-sectional view of the first embodiment illustrating the key aligned with the second slot portion of the first aperture after rotation of the shaft;

FIG. 17 is a front view similar to FIG. 2 illustrating the lifting mechanism moving the hold down mechanism downward to the detent position;

FIG. 18 is a fragmentary cross-sectional view similar to FIG. 16, illustrating the key separated from the keyway and located within the second slot portion when the hold-down mechanism is in the detent position;

FIG. 19 is a fragmentary top view of the first embodiment illustrating flatness and positional accuracy measurements performed by the combination of the rotary plate, the additional circuit board, and the shield, with the alignment pins and screw holes of the rotary plate omitted;

fig. 20 is a fragmentary exploded front view of the positioning jig according to the second embodiment of the present invention, illustrating that the first positioning portion has a first semicircular arc surface, and the second positioning portion has a second semicircular arc surface for abutting against the first semicircular arc surface; and

fig. 21 is a fragmentary perspective view of the guiding and positioning frame body according to the third embodiment of the positioning fixture of the invention, illustrating that the first positioning portion is integrally formed on a top surface of the carrier plate.

Detailed Description

The invention is described in detail below with reference to the following figures and examples:

before describing the present invention in detail, it is noted that like elements are represented by like reference numerals throughout the following description.

Referring to fig. 1 and 2, a positioning fixture 300 according to a first embodiment of the present invention is applied to a machining tool, such as a Computer Numerical Control (CNC) machine, and the positioning fixture 300 is assembled on a multi-axis machining tool 200 for clamping and positioning a workpiece 1 to be machined, so that the machining tool can machine the workpiece 1. The multi-axis processing tool 200 is exemplified by a four-axis processing tool. The positioning fixture 300 includes a carrier 3, a lifting mechanism 4, a pressing mechanism 5, a supporting module 6, and a rotation driving mechanism 7.

Referring to fig. 3 and 4, the carriage 3 includes a carriage body 31, a guiding and positioning body 32, and a shield 34. The carriage 31 has a vertical plate 311 and a flat plate 312 perpendicular to the vertical plate 311. The vertical plate 311 is locked to the multi-axis processing machine 200 (as shown in fig. 2) by a screw locking method. The vertical plate 311 is formed with a center hole 313, and the center of the center hole 313 and the rotation center of the multi-axis processing machine table 200 are located on the same axis a, which extends in the Y direction. Thus, the multi-axis processing machine 200 can drive the carrier 31 to rotate around the axis a. The plate 312 is formed with a first through hole 314 and a second through hole 315 spaced apart from the first through hole 314. The first and second through holes 314 and 315 extend in the Z direction and penetrate the plate 312. The first through hole 314 has a circular hole portion 316, a first groove portion 317 communicating with the outer periphery of the circular hole portion 316, and a second groove portion 318 communicating with the outer periphery of the circular hole portion 316. The first groove 317 and the second groove 318 are separated by an angle of, for example, 90 degrees at the circular hole 316.

The guiding and positioning frame 32 includes a supporting plate 321, a plurality of pads 322, a plurality of locking bolts 323, and a plurality of first positioning portions 324. The spacers 322 are disposed between the top surface of the plate 312 and the bottom surface of the supporting plate 321 for increasing the height of the supporting plate 321 to be spaced apart from the plate 312 by a certain distance. Each locking bolt 323 penetrates through the bearing plate 321 and the corresponding cushion block 322 and is screwed on the flat plate 312, so that the bearing plate 321 can be stably positioned at a distance above the flat plate 312.

Referring to fig. 4, 5 and 6, the carrier 321 is formed with a through hole 325 extending along the Z direction. The carrier plate 321 has a top surface 326, and the top surface 326 of the carrier plate 321 is recessed to form a plurality of caulking grooves 327 arranged at equal angles and intervals. The bottom surface of the carrier plate 321 is recessed to form a plurality of through holes 328. In the present embodiment, the number of the first positioning portions 324, the number of the slots 327, and the number of the through holes 328 are four. Each of the slots 327 is long, two of the slots 327 are arranged at intervals along the X direction and each long direction extends along the X direction, and the other two slots 327 are arranged at intervals along the Y direction and each long direction extends along the Y direction, so that each two adjacent slots 327 are perpendicular to each other. Each of the slots 327 is defined by a plane 329 of the carrier 321 and two side walls 330 perpendicularly connected to opposite sides of the plane 329. Each through hole 328 extends to a corresponding flat 329 at a top end thereof and communicates with a corresponding insert 327.

Each first positioning portion 324 is an elongated positioning block that is embedded in the corresponding embedding groove 327. Each of the first positioning portions 324 has a bottom surface 331, two side surfaces 332 extending upward from opposite sides of the bottom surface 331, and two first inclined surfaces 333 obliquely connected to the tips of the two side surfaces 332. A screw hole 334 is formed on the bottom 331 of each first positioning portion 324. The bottom 331 of each first positioning portion 324 abuts against the plane 329 of the corresponding slot 327, and the screw hole 334 is communicated with the corresponding through hole 328. Each side surface 332 abuts against the corresponding side elevation surface 330. The two side surfaces 332 are clamped and stopped by the two side surfaces 330, respectively, so as to limit the corresponding first positioning portion 324 from swinging relative to the supporting plate 321 along the X direction, or limit the corresponding first positioning portion 324 from swinging relative to the supporting plate 321 along the Y direction. The guiding and positioning frame 32 further includes a plurality of locking screws 335, each locking screw 335 is disposed through the corresponding through hole 328 and is screwed into the corresponding screw hole 334, so as to lock the first positioning portion 324 to the supporting plate 321, and the first positioning portion 324 can be stably positioned in the corresponding recessed groove 327. Thereby, the first positioning portion 324 is prevented from moving upward in the Z direction and being separated from the groove 327. In addition, since each two adjacent embedding slots 327 are perpendicular to each other and each first positioning portion 324 is embedded and positioned in the corresponding embedding slot 327, each two adjacent first positioning portions 324 are also perpendicular to each other.

Referring to fig. 1 and 3, the shield 34 is screwed around the plate 312 and the supporting plate 321 to shield the first through hole 314, the second through hole 315, the pad 322 and the supporting plate 321.

Referring to fig. 4 and 6, in the embodiment, each plane 329 of the loading plate 321 is perpendicular to the vertical plane 319 of the vertical plate 311 combined with the multi-axis processing machine 200 (as shown in fig. 2), and a tolerance of a verticality between each plane 329 and the vertical plane 319 is ± 20 micrometers (μm). The angle a1 between the first inclined surfaces 333 of each first positioning portion 324 is, for example, 90 ± 0.02 degrees. The height H of each first positioning portion 324 is within a tolerance of ± 10 μm. The tolerance of the width W of each first positioning portion 324 is 0 to 50 μm. By setting the tolerance of each dimension, the positioning accuracy of the positioning fixture 300 can be ensured to meet the required requirement.

Referring to fig. 4 and 7, the lifting mechanism 4 includes a cylinder 41 and a support bracket 42. The cylinder 41 is fastened to the joint plate 310 of the carriage body 31 by a screw fastening method, and the joint plate 310 is fastened to the bottom surface of the flat plate 312 and located in front of the vertical plate 311. The support bracket 42 is fixedly disposed on the cylinder 41 and can be driven by the cylinder 41 to move up and down along the Z direction. The support bracket 42 has a horizontal support plate 421, and the support plate 421 is formed with a pivot hole 422 extending in the Z direction.

The press mechanism 5 includes a press module 51, a rotary shaft 52, two bearings 53, and a rotary disk 54. The pressing module 51 is a pneumatic rotary clamping cylinder and includes a cylinder 511 and a clamping rod 512. The cylinder 511 is located below the support plate 421. The holding rod 512 has a rod body 513 protruding from the top end of the cylinder 511, and a long holding block 514 disposed at the top end of the rod body 513. The rod 513 is disposed through the pivot hole 422, the circular hole 316 of the first through hole 314 and the through hole 325, and the rod 513 protrudes out of the top end of the supporting plate 321. The clamping rods 512 of the press module 51 may move upward or downward in the Z direction with respect to the cylinder 511 and simultaneously rotate within a predetermined angle, for example, 90 degrees, to change the height and angular position of the clamping blocks 514.

The rotating shaft 52 includes a shaft 521, a key 522, and a screw 523. The shaft 521 is fixedly disposed at the top end of the cylinder 511 and axially parallel to the Z direction. The shaft 521 passes through the pivot hole 422, the circular hole 316 of the first through hole 314 and the through hole 325 and is rotatably pivoted to the pivot hole 422, and the shaft 521 protrudes out of the top end of the bearing plate 321. The shaft 521 is formed with a shaft hole 524 through which the rod body 513 of the clamping lever 512 is inserted. The key 522 is locked to the shaft 521 by a screw 523 and can be received in the first slot 317 (shown in fig. 3) or the second slot 318 of the first through hole 314.

Each bearing 53 is a thrust bearing sleeved on the shaft 521. One of the bearings 53 abuts between the top end of the cylinder 511 and the bottom surface of the support plate 421, and the other bearing 53 abuts between the top surface of the support plate 421 and the flange 525 of the shaft 521. Thereby, the rotary shaft 52 can smoothly rotate with respect to the support plate 421 via the bearings 53.

Referring to fig. 7, 8 and 9, the rotating disc 54 includes a disc 541, a plurality of pins 542, and a plurality of positioning pins 543. The disk 541 is circular and has a disk 544 and a plurality of nub bodies 545. The plate 544 is formed with a through hole 546 through which the shaft 521 passes, and a plurality of screw holes 540. The tray body 544 has a plurality of second positioning portions 547 arranged at equal angular intervals. In this embodiment, the number of the second positioning portions 547 is four, each of the second positioning portions 547 has two second inclined surfaces 548 formed on the bottom surface of the tray 544, and the two second inclined surfaces 548 define a positioning slot 549 for the first positioning portion 324 to engage. The angle a2 between the two second inclined surfaces 548 is 90 ± 0.02 degrees, for example, and the positioning accuracy of the positioning fixture 300 can be ensured to meet the required requirement by the above dimensional tolerance setting. Each of the second positioning portions 547 is elongated, two of the second positioning portions 547 are arranged at intervals in the X direction and each of the length directions extends in the X direction, and the other two second positioning portions 547 are arranged at intervals in the Y direction and each of the length directions extends in the Y direction, so that each two adjacent second positioning portions 547 are perpendicular to each other.

The shaft 521 of the rotating shaft 52 is formed with a plurality of first pin holes 526 arranged at equal angular intervals. Each boss body 545 is formed with a second pin hole 550 communicating with the corresponding first pin hole 526. Each latch 542 is engaged in the first pin hole 526 and the second pin hole 550, which are communicated with each other, so that the disk 541 is fixed on the shaft 521. Each positioning pin 543 is protruded on the top surface of the plate 544.

Referring to fig. 2 and 4, the support bracket 42 of the lifting mechanism 4 is used to drive the pressing mechanism 5 to move axially along the shaft 521 of the rotating shaft 52 between a detent position (as shown in fig. 2) and a release position (as shown in fig. 12) having a height higher than that of the detent position. In the locking position, each first positioning portion 324 is locked in the corresponding positioning slot 549 of the second positioning portion 547, so that the rotary disc 54 is firmly fixed on the guiding and positioning frame 32. In the release position, each first positioning portion 324 is separated from the corresponding positioning slot 549 of the second positioning portion 547, so as to release the locking state between the rotary disc 54 and the guide positioning frame 32.

Referring to fig. 2, 3 and 4, the support module 6 includes a support plate 61, a cover plate 62, and a plurality of bolts 63. The supporting plate 61 is rectangular and has a plurality of positioning holes 611 for the positioning pins 543 to engage, an opening 612 for the clamping rod 512 to pass through, and a plurality of through holes 613. The support plate 61 is used to support the workpiece 1. The through holes 613 of the support plate 61 are aligned with the screw holes 540 of the tray body 544, respectively. Each bolt 63 is disposed through the corresponding through hole 613 and screwed into the corresponding screw hole 540, so as to fix the support plate 61 on the tray 544. The workpiece 1 of the first embodiment is exemplified by a rectangular mobile phone case, and the workpiece 1 is formed with an opening 11 through which the holding rod 512 is inserted. The cover plate 62 is rectangular to cover the top end of the workpiece 1 and form an opening 621 through which the clamping rod 512 passes. The openings 612, 11, 621 are elongated and have the same shape as the holding block 514.

When the supporting module 6 and the workpiece 1 are assembled and fixed on the rotating disc 54 of the pressing mechanism 5, the supporting plate 61 is firstly sleeved on the clamping rod 512, so that the clamping block 514 passes through the opening 612 and protrudes out of the top end of the supporting plate 61, and the positioning pins 543 of the rotating disc 54 are clamped in the corresponding positioning holes 611 of the supporting plate 61. Subsequently, each bolt 63 is inserted through the corresponding through hole 613 and screwed into the corresponding screw hole 540, so as to lock the support plate 61 on the tray body 544.

The workpiece 1 is sleeved on the clamping rod 512 and assembled on the supporting plate 61, so that the clamping block 514 passes through the opening 11 and protrudes out of the top end of the workpiece 1. The supporting plate 61 may fix the workpiece 1 on the supporting plate 61 by, for example, fixing the positioning pins to fix the workpiece 1 in a clamping manner or by vacuum suction. Then, the cover plate 62 is sleeved on the clamping rod 512 and covers the top end of the workpiece 1, so that the clamping block 514 passes through the opening 621 and protrudes out of the top end of the cover plate 62, and the cover plate 62 and the supporting plate 61 clamp the workpiece 1 together and expose the outer circumferential surface 12 of the workpiece 1. Finally, the clamping rod 512 driving the press module 51 moves downward in the Z direction with respect to the cylinder 511 and simultaneously rotates by a predetermined angle of 90 degrees, so that the clamping block 514 moves to a clamping position clamping the cover plate 62 as shown in fig. 1. The support module 6 and the workpiece 1 are pressed against the tray 544 of the rotary disk 54 by the clamp block 514 so that the support module 6 and the workpiece 1 can be stably positioned on the tray 544.

Referring to fig. 3, 10 and 11, the rotation driving mechanism 7 includes a rotation driving member 71, a first gear 72 and a second gear 73. The rotary driving member 71 is a rotary cylinder locked to the bottom surface of the plate 312 and passing through the second through hole 315. The first gear 72 is located on the top surface of the plate 312 and is locked to the top end of the rotary driving member 71 and can be driven to rotate by the rotary driving member. The second gear 73 is sleeved on the shaft 521 and located between the top surface of the plate 312 and the additional circuit board 321, the second gear 73 is engaged with the first gear 72 and forms a key slot 731, and the key slot 731 can communicate with the first slot portion 317 or the second slot portion 318 of the first through hole 314 and is used for the key 522 to be engaged.

The following will describe the operation of the multi-axis processing machine 200 and the positioning fixture 300 in detail:

referring to fig. 2, 10 and 11, when the pressing mechanism 5 is located at the engaging position, each first positioning portion 324 is engaged with the positioning slot 549 corresponding to the second positioning portion 547, and the two first inclined surfaces 333 of each first positioning portion 324 abut against the two second inclined surfaces 548 corresponding to the second positioning portion 547, so that the rotating disc 54 is firmly fixed on the guide positioning frame body 32. The key groove 731 of the first gear 73 is positioned to be aligned with the first groove portion 317 of the first through hole 314, and the key 522 of the rotating shaft 52 is positioned within the first groove portion 317 and below the key groove 731 to be separated therefrom. At this time, the outer peripheral surface 12 of the workpiece 1 is first machined by a tool (not shown) of the machining tool. Subsequently, the multi-axis machining tool 200 drives the positioning tool 300 to rotate 90 degrees in the first rotation direction R1 from the initial position shown in fig. 2, so that the first surface 121 of the outer peripheral surface 12 faces upward, and the tool performs machining on the first surface 121 alone. After the first surface 121 is machined, the multi-axis machining tool 200 drives the positioning tool 300 to rotate 180 degrees in a second rotation direction R2 opposite to the first rotation direction R1, so that the second surface 122 of the outer circumferential surface 12 opposite to the first surface 121 faces upward, and the tool can machine the second surface 122 independently. After the second surface 122 is processed, the multi-axis processing machine 200 drives the positioning fixture 300 to rotate 90 degrees along the first rotation direction R1 and return to the initial position.

Referring to fig. 12 and 13, the lifting mechanism 4 drives the pressing mechanism 5 via the support bracket 42 to move upward along the axial direction of the shaft 521 in the lifting direction D1. The rotating disc 54 is driven to move upwards during the moving up process of the rotating shaft 52, so that the detent groove 549 of each second detent 547 is gradually separated from the corresponding first detent 324. At the same time, the key 522 of the rotating shaft 52 is gradually moved away from the first groove 317 and extends into the key groove 731 of the first gear 73. When the support bracket 42 drives the pressing mechanism 5 to move up to the release position shown in fig. 12, the detent 549 of each second detent 547 is completely separated from the corresponding first detent 324, so as to release the engagement between the rotary disk 54 and the guide and positioning frame 32, and the key 522 is engaged in the keyway 731 of the first gear 73 and separated from the first groove 317.

Referring to fig. 14, 15 and 16, when the pressing mechanism 5 is at the releasing position, the rotary driving member 71 of the rotary driving mechanism 7 drives the first gear 72 to rotate in the first rotation direction I1, and the rotation of the first gear 72 drives the second gear 73 to rotate in the second rotation direction I2 opposite to the first rotation direction I1. Since the key 522 of the rotating shaft 52 is engaged in the key groove 731 of the second gear 73, the rotating shaft 52 is driven by the key 522 to rotate around the axial direction thereof during the rotation of the second gear 73, so that the pressing mechanism 5 rotates relative to the supporting bracket 42. During the rotation of the pressing mechanism 5 relative to the support bracket 42, the support module 6 and the workpiece 1 are simultaneously rotated by the rotating disc 54. When the rotational driving mechanism 7 drives the pressing mechanism 5 to rotate by about 90 degrees in the second rotating direction I2 through the second gear 73, the rotation of the pressing mechanism 5 is stopped, the other second positioning portion 547 of the rotated rotary disk 54 is aligned above the corresponding first positioning portion 324, and the key 522 is aligned above the second groove portion 318 of the first through hole 314.

Referring to fig. 17 and 18, the lifting mechanism 4 then drives the pressing mechanism 5 via the support bracket 42 in a downward direction D2 opposite to the lifting direction D1 (shown in fig. 12). The rotating disc 54 is driven to move downwards during the downward movement of the rotating shaft 52, so that each of the second positioning portions 547 gradually approaches the corresponding first positioning portion 324. Meanwhile, the key 522 of the rotating shaft 52 is gradually moved away from the key slot 731 and extends into the second slot portion 318. Since each first inclined surface 333 of each first positioning portion 324 is used for contacting the corresponding second inclined surface 548, when any second inclined surface 548 of each second positioning portion 547 contacts the corresponding first inclined surface 333 first due to slight deviation of the rotated angle during the downward movement of the rotating disc 54, the second inclined surface 548 moves downward along the first inclined surface 333, and the component force applied to the second inclined surface 548 by the first inclined surface 333 pushes the second inclined surface 548 to rotate the rotating disc 54 simultaneously during the downward movement, thereby achieving the effect of automatically guiding the angle of the rotating disc 54. When each first positioning portion 324 is engaged with the corresponding positioning slot 549 of the second positioning portion 547 and the two first inclined surfaces 333 abut against the two second inclined surfaces 548, the rotating disc 54 of the pressing mechanism 5 cannot move downward any more, so that the pressing mechanism 5 is positioned at the engaging position. At this time, the key 522 of the rotating shaft 52 is caught in the second groove 318 and separated from the key groove 731.

Next, the multi-axis machining tool 200 drives the positioning jig 300 to rotate 90 degrees in the first rotation direction R1 from the initial position shown in fig. 17, so that the third surface 123 of the outer peripheral surface 12 faces upward, and the tool performs machining on the third surface 123 alone. After the third surface 123 is machined, the multi-axis machining tool 200 drives the positioning tool 300 to rotate 180 degrees in the second rotation direction R2, so that the fourth surface 124 of the outer circumferential surface 12 opposite to the third surface 123 faces upward, so that the tool can machine the fourth surface 124 alone. After the fourth surface 124 is processed, the multi-axis processing machine 200 drives the positioning fixture 300 to rotate 90 degrees along the first rotation direction R1 and return to the initial position.

Referring to fig. 14 and 18, the lifting mechanism 4 drives the pressing mechanism 5 to move upward along the lifting direction D1 to the releasing position through the supporting bracket 42, the rotation driving mechanism 7 drives the pressing mechanism 5 to rotate 90 degrees along the first rotation direction I1 through the second gear 73 to return to the position shown in fig. 12, and then the lifting mechanism 4 drives the pressing mechanism 5 to move downward along the lowering direction D2 to the catching position shown in fig. 2 through the supporting bracket 42, thereby completing the processing operation of the workpiece 1.

Referring to fig. 3, the clamping rod 512 of the driving press module 51 moves upward in the Z direction with respect to the cylinder 511 and simultaneously rotates by 90 degrees so that the clamping block 514 is separated from the cover plate 62. Then, the processed workpiece 1 can be detached from the clamping bar 512 and the support plate 61.

In the positioning fixture 300 of the present embodiment, when clamping and positioning other workpieces of different types or shapes, only the supporting plate 61 and the cover plate 62 need to be replaced, so that the replaced supporting plate and cover plate can be matched with the shape of the workpiece. Therefore, the applicability, the breadth and the elasticity of the positioning fixture 300 can be improved. Furthermore, the positioning pins 543 are engaged in the corresponding positioning holes 611, and the bolts 63 penetrate through the supporting plate 61 and are locked to the rotating disc 54, so that the supporting plate 61 can be quickly assembled and fixed on the rotating disc 54. By loosening the bolts 63 to separate them from the rotary plate 54, the support plate 61 can be moved upward to separate the positioning pins 543 from the corresponding positioning holes 611, so that the support plate 61 can be quickly detached from the rotary plate 54. Thus, the support plate 61 can be quickly and easily assembled and disassembled.

Referring to fig. 3 and 19, in order to ensure that the rotary plate 54 can meet the requirement of high precision during repeated positioning by the cooperation of the second positioning portion 547 and the first positioning portion 324 of the guide positioning frame 32, after the related structure is manufactured and assembled, the following detection methods of flatness and position precision are used to verify whether the positioning precision meets the requirement.

The first embodiment can conveniently and directly perform the verification operation on the positioning jig 300 by the following structural design. The shield 34 has a mark 341 marked as 0 degrees and the top surface of the plate 544 of the rotating disk 54 has an alignment mark 551 for aligning the mark 341. A raised ring 552 is raised from the top surface of disk 544 adjacent the outer periphery, and ring 552 has 8 angularly equally spaced first annular surfaces 553 and 8 angularly equally spaced second annular surfaces 554. The height of the second ring surface 554 is lower than that of the first ring surfaces 553, and each second ring surface 554 is located between two adjacent first ring surfaces 553 and has two sides 555 adjacent to the two first ring surfaces 553. The alignment mark 551 is located inside one of the second ring surfaces 554. The two second ring surfaces 554 spaced apart in the X direction and the two second ring surfaces 554 spaced apart in the Y direction respectively correspond to the upper portions of the four second positioning portions 547.

The operation flow for detecting the flatness is as follows:

step 1: the alignment marks 551 of the rotating disk 54 are aligned with the marks 341 of the shroud 34.

Step 2: the lifting mechanism 4 drives the pressing mechanism 5 to move down to the locking position, so that each first positioning portion 324 is locked in a positioning slot 549 (shown in fig. 8) corresponding to the second positioning portion 547.

And step 3: 8 marking points P are respectively marked at the same positions of the 8 first toroids 553.

And 4, step 4: a vertical distance from the 8 marked points P to the top surface 326 of the carrier 321 is measured, wherein the top surface 326 is a Z-direction detection reference surface. Thereby obtaining 8 height dimensions measured for the first time at a first angle, such as 0 degrees.

And 5: the pressing mechanism 5 is driven by the lifting mechanism 4 to move up to the release position.

Step 6: the rotary disk 54 that drives the pressing mechanism 5 by the rotary drive mechanism 7 is rotated 90 degrees in the first rotational direction I1 or the second rotational direction I2, and the second positioning portions 547 are aligned with the first positioning portions 324 that are different from the detent positions.

And 7: the lifting mechanism 4 drives the pressing mechanism 5 to move downwards to the clamping position.

And 8: the vertical distance from the 8 marked points P to the top surface 326 of the carrier 321 is measured, so as to obtain 8 height dimensions measured for the first time at a second angle, such as 90 degrees.

And step 9: comparing the 8 height dimensions measured for the first time at the first angle with the 8 height dimensions measured for the first time at the second angle, wherein the height dimension obtained by the vertical distance between the marking point P before non-rotation and the top surface 326 is compared with the height dimension obtained by the vertical distance between the marking point P after rotation by 90 degrees and the top surface 326, so as to know whether the height dimension of the marking point P before and after rotation is changed.

Step 10: the pressing mechanism 5 is driven by the lifting mechanism 4 to move up to the release position.

Step 11: the rotary disk 54 of the pressing mechanism 5 is driven by the rotary drive mechanism 7 to rotate 90 degrees in the first rotational direction I1 or the second rotational direction I2, so that the index 551 of the rotary disk 54 is aligned with the index 341 of the shield 34.

Step 12: the lifting mechanism 4 drives the pressing mechanism 5 to move downwards to the clamping position.

Step 13: the vertical distances from the 8 marked points P to the top surface 326 of the carrier 321 are measured to obtain 8 height dimensions measured at the first angle for the second time.

Repeating the steps 5-8: 8 height dimensions were obtained for the second measurement at the second angle.

Thereafter, 8 height dimensions measured at the second time at the first angle are compared with 8 height dimensions measured at the second angle, 8 height dimensions measured at the second time at the first angle are compared with 8 height dimensions measured at the first time, and 8 height dimensions measured at the second angle are compared with 8 height dimensions measured at the first time. If the compared value exceeds the predetermined error range, the second positioning portion 547 and the first positioning portion 324 are inspected again to determine whether the machining dimension has not reached the design requirement. The flatness detection is repeated by performing the above-described detection after re-correcting the size of the second positioning portion 547 or the first positioning portion 324. Therefore, the flatness error of the repeated positioning accuracy of the first embodiment under the same angle (such as 0 degree or 90 degrees) can be controlled to be 0.003mm, and the flatness error of the repeated positioning accuracy after the rotation angle (such as 0 degree to 90 degrees or 90 degrees to 0 degree) can be controlled to be less than 0.009 mm.

Since some steps in the operation flow of the position degree detection are the same as those in the operation flow of the flatness detection, the following operation flow of the position degree detection will omit the steps that are the same as those in the operation flow of the flatness detection, and only the steps that differ will be described:

and step 3: marking two marking points on each side 555 of two second ring surfaces 554 spaced along the X direction to obtain 8 first marking points P1-P8; two points are marked on each side 555 of the two second ring surfaces 554 spaced along the Y direction to obtain 8 second marked points P9-P16. The first marking points P1-P8 are spaced from the Y-direction detection reference surface 336 of the carrier plate 321, and the second marking points P9-P16 are spaced from the X-direction detection reference surface 337 of the carrier plate 321.

And 4, step 4: the vertical distance from the 8 first mark points P1-P8 to the Y-direction detection reference plane 336 of the carrier 321 is measured to obtain a plurality of Y-direction dimensions measured for the first time at a first angle, such as 0 degrees. The vertical distance from the 8 second mark points P9-P16 to the X-direction detection reference plane 337 of the carrier 321 is measured to obtain a plurality of X-direction dimensions measured at the first angle.

And 8: the vertical distance from the 8 first indicating points P1-P8 rotated by 90 degrees to the X-direction detection reference surface 337 is measured to obtain the X-direction dimension measured for the first time at a second angle of, for example, 90 degrees. And measuring the vertical distance from 8 second indicating points P9-P16 rotated by 90 degrees to the Y-direction detection reference surface 336 to obtain the first measured Y-direction dimension at the second angle.

And step 9: comparing the first measured Y-dimension at the first angle with the first measured Y-dimension at the second angle, and comparing the first measured X-dimension at the first angle with the first measured X-dimension at the second angle. In this case, the point before the rotation is compared with the point at the same position after the rotation by 90 degrees, so as to determine whether the rotation angle of the rotating disc 54 is 90 degrees.

Step 13: the vertical distance from the 8 first marked points P1-P8 to the Y-direction detection reference surface 336 is measured to obtain the Y-direction dimension measured for the second time at the first angle. The perpendicular distance from the 8 second marked points P9-P16 to the X-direction detection reference surface 337 is measured to obtain the X-direction dimension measured for the second time at the first angle.

Repeating the steps 5-8: obtaining the X-direction dimension and the Y-direction dimension of the second measurement at the second angle.

Then, the X-direction dimension and the Y-direction dimension measured for the second time at the first angle are compared with the X-direction dimension and the Y-direction dimension measured for the second time at the second angle, the X-direction dimension and the Y-direction dimension measured for the second time at the first angle are compared with the X-direction dimension and the Y-direction dimension measured for the first time, and the X-direction dimension and the Y-direction dimension measured for the second time at the second angle are compared with the X-direction dimension and the Y-direction dimension measured for the first time. If the compared value exceeds the predetermined error range, the second positioning portion 547 and the first positioning portion 324 are inspected again to determine whether the machining dimension has not reached the design requirement. After the second positioning unit 547 or the first positioning unit 324 is re-sized, the position degree detection is repeated by the above-described detection method. Thereby, the position degree error of the repeated positioning precision of the first embodiment under the same angle (such as 0 degree or 90 degrees) can be controlled to be 0.004mm, and the position degree error of the repeated positioning precision after the rotation angle (such as 0 degree to 90 degrees or 90 degrees to 0 degrees) can be controlled to be less than 0.006 mm.

By detecting the flatness and the position through the positioning fixture 300, the positioning accuracy can be detected conveniently and quickly, so as to ensure that the second positioning portion 547 and the first positioning portion 324 can meet the high accuracy requirement required for repeated positioning.

Referring to fig. 3, it should be noted that, in other implementation aspects of the first embodiment, the following different variations are possible:

in one embodiment, the number of the first positioning portions 324 of the guiding and positioning frame 32 is one, and the positioning effect can be achieved by matching one first positioning portion 324 with a plurality of second positioning portions 547.

In another embodiment, the guiding and positioning frame body 32 of the carriage 3 includes the plurality of second positioning portions 547, and the disk 541 of the rotating disk 54 includes the plurality of first positioning portions 324, so that the positioning effect can be achieved by the cooperation of the plurality of first positioning portions 324 and the plurality of second positioning portions 547.

In another embodiment, the guiding and positioning frame 32 of the carriage 3 includes the plurality of second positioning portions 547, and the disk 541 of the rotary disk 54 includes a first positioning portion 324, so that the positioning effect can be achieved by the cooperation of the first positioning portion 324 and the plurality of second positioning portions 547.

Referring to fig. 20, the overall structure of the positioning fixture according to the second embodiment of the present invention is substantially the same as that of the first embodiment, and the difference is the structure of each first positioning portion 324 and each second positioning portion 547.

In the second embodiment, each of the first positioning portions 324 has a first semicircular arc surface 338 connected to the top ends of the two side surfaces 332. Each second positioning portion 547 has a second semicircular surface 556 formed on the bottom surface of the tray body 544 for abutting against the first semicircular surface 338, and the second semicircular surface 556 defines a positioning slot 549 for the first positioning portion 324 to engage. The first semicircular arc surface 338 of each first positioning portion 324 is matched with the corresponding second semicircular arc surface 556 of the second positioning portion 547, so that the rotation disc 54 can be automatically guided and moved downward.

Referring to fig. 21, a third embodiment of the positioning fixture of the present invention is substantially the same as the first embodiment in terms of the overall structure, and the difference is the connection manner between each first positioning portion 324 and the carrier plate 321.

In the third embodiment, the first positioning portion 324 is integrally formed on the top surface 326 of the supporting plate 321. Therefore, the dimensional accuracy of the integrally formed structure after manufacture can be improved, and the structure can be applied to occasions with higher requirements on the processing accuracy of the workpiece 1.

In summary, the positioning jig 300 according to each embodiment can reduce the manufacturing cost of machining and can position the workpiece 1 to be machined with high accuracy, and the object required by the present invention can be surely achieved.

Claims

1. A positioning jig is suitable for clamping and positioning a workpiece; the method is characterized in that:

2. The positioning jig of claim 1, wherein: the first positioning part is a positioning clamping block, and the second positioning part is provided with a positioning clamping groove for clamping the first positioning part.

3. The positioning jig according to claim 2, wherein: the first positioning portion is provided with two inclined first inclined planes, the second positioning portion is provided with two inclined second inclined planes which are respectively abutted to the first inclined planes, and the second inclined planes define the positioning clamping groove.

4. The positioning jig according to claim 2, wherein: the first positioning portion is provided with a first semicircular arc surface, the second positioning portion is provided with a second semicircular arc surface for abutting of the first semicircular arc surface, and the second semicircular arc surface defines the positioning clamping groove.

5. The positioning jig according to any one of claims 2 to 4, wherein: the bearing frame comprises a bearing plate for bearing the rotating disc and a first positioning part arranged on the bearing plate, and the rotating disc comprises a second positioning part.

6. The positioning jig according to claim 5, wherein: the first positioning portion is integrally formed on the bearing plate.

7. The positioning jig according to claim 5, wherein: the bearing plate is provided with a top surface, the top surface is sunken to form an embedding groove for the first positioning part to be embedded, and the bearing plate comprises a locking screw which penetrates through the first positioning part and is screwed on the bearing plate.

8. The positioning jig according to claim 5, wherein: two adjacent second positioning portions of the second positioning portions are perpendicular to each other, the carrier includes a plurality of first positioning portions, and two adjacent first positioning portions of the first positioning portions are perpendicular to each other.

9. The positioning jig according to claim 5, wherein: the bearing frame further comprises a flat plate and a plurality of cushion blocks arranged between the flat plate and the bearing plate, a first through hole is formed in the flat plate, the rotating shaft comprises a shaft rod penetrating through the first through hole and a key arranged on the shaft rod, the rotating driving mechanism comprises a rotating driving piece arranged on the flat plate, a first gear which is arranged on the flat plate and can be driven by the rotating driving piece to rotate, and a second gear which is sleeved on the rotating shaft and meshed with the first gear, the second gear is arranged between the flat plate and the bearing plate and is provided with a key groove for clamping the key, the releasing position is higher than the clamping position, the key is separated from the key groove when the clamping position is adopted, and the key is clamped in the key groove when the releasing position is adopted.

10. The positioning jig of claim 9, wherein: the pressing module comprises a cylinder body and a clamping rod arranged at the top end of the cylinder body, the shaft rod is fixedly arranged at the top end of the cylinder body and is provided with a shaft hole, and the clamping rod penetrates through the shaft hole, the supporting module and the workpiece and is used for pressing the supporting module to be located on the rotating disc.

11. The positioning jig of claim 1, wherein: the rotary disc comprises a plurality of positioning pins, the supporting module comprises a supporting plate and a plurality of bolts, the supporting plate is used for supporting the workpiece, a plurality of positioning holes for clamping the positioning pins are formed in the supporting plate, and the bolts penetrate through the supporting plate and are screwed on the rotary disc.

12. The positioning jig of claim 1, wherein: the rotating shaft comprises a shaft rod penetrating through the bearing frame and a key arranged on the shaft rod, the rotating driving mechanism comprises a rotating driving piece arranged on the bearing frame, a first gear which can be driven by the rotating driving piece to rotate, and a second gear which is sleeved on the shaft rod and meshed with the first gear, a key groove for clamping the key is formed in the second gear, the key is separated from the key groove when the key is at the clamping position, and the key is clamped in the key groove when the key is at the releasing position.

13. A positioning jig is suitable for clamping and positioning a workpiece; the method is characterized in that:

14. A positioning jig is suitable for clamping and positioning a workpiece; the method is characterized in that:

15. A positioning jig is suitable for clamping and positioning a workpiece; the method is characterized in that:

16. The combination of a positioning jig and a multi-axis machining machine table is suitable for clamping and positioning a workpiece; the method is characterized in that:

17. The combination of the positioning fixture and the multi-axis processing machine as claimed in claim 16, wherein: the bearing frame comprises a bearing frame body and a guiding and positioning frame body, the bearing frame body is provided with a vertical plate fixedly locked on the multi-axis machining machine table and a flat plate perpendicular to the vertical plate, the guiding and positioning frame body is arranged on the flat plate and comprises a first positioning part, the first positioning part is a positioning clamping block, the rotary disc comprises a second positioning part, and a positioning clamping groove for the first positioning part to clamp is formed in the second positioning part.

18. The combination of the positioning jig and the multi-axis machining apparatus as claimed in claim 17, wherein: the first positioning portion is provided with two inclined first inclined planes, the second positioning portion is provided with two inclined second inclined planes which are respectively abutted to the first inclined planes, and the second inclined planes define the positioning clamping groove.

19. A method for detecting the positioning precision of a positioning jig; the method is characterized in that:

the method comprises the following steps:

20. A method for detecting the positioning precision of a positioning jig; the method is characterized in that:

the method comprises the following steps: