CN212020410U

CN212020410U - Machining clamp

Info

Publication number: CN212020410U
Application number: CN202020246692.9U
Authority: CN
Inventors: 佐佐木义宪; 濑户岛功; 池堂僚一
Original assignee: Citizen Watch Co Ltd
Current assignee: Citizen Watch Co Ltd
Priority date: 2019-03-18
Filing date: 2020-03-03
Publication date: 2020-11-27
Anticipated expiration: 2030-03-03
Also published as: JP2020151772A; JP7171479B2

Abstract

In the processing jig put into the polishing tank of the barrel polishing apparatus, the degree of polishing can be changed without changing the type of the medium and the length of the polishing processing time. A machining jig (10) which holds a link member (100) (an example of a workpiece) to be ground by barrel grinding and which is put into a grinding tank (400) of a barrel grinding apparatus, the machining jig (10) comprising: a main body part (20) in which a counterweight housing part (28) is formed; a counterweight (50) replaceably housed in the counterweight housing section (28); and a holding member (40) that holds the plurality of link members (100) to the main body (20).

Description

Machining clamp

Technical Field

The utility model relates to a add clamping apparatus and use this add clamping apparatus's grinding processing method.

Background

A metal watch case or watch band of a wristwatch is ground using a barrel grinder, for example. In the grinding process using the barrel grinding machine, a plurality of objects to be processed such as link members of a watch case or a watch band are put into a grinding groove of the barrel grinding machine together with a medium (grinding stone, grinding material), and the grinding groove is moved by rotation or the like to rub the medium against the objects to be processed, thereby grinding the surfaces of the objects to be processed.

However, in the grinding groove, since the objects to be processed are in contact with each other, scratches or dents may be generated on the surface of the objects to be processed. As a countermeasure, there has been provided a barrel polishing method in which a plurality of workpieces are fixed to position fixing jigs, respectively, and the workpieces are fed into a polishing tank together with the position fixing jigs (for example, refer to patent document 1).

According to this barrel polishing method, since the workpiece put into the polishing groove is fixed to the position fixing jig, the workpiece does not contact with each other, and scratches and dents can be prevented from occurring in the workpiece.

(Prior art document)

(patent document)

Patent document 1: japanese laid-open patent publication No. 62-028168

SUMMERY OF THE UTILITY MODEL

(problem to be solved by the utility model)

Although the degree of grinding in the grinding process using the barrel grinding can be changed by the kind of the medium or the length of the grinding process time, if these cannot be changed, it is necessary to change the degree by another method.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a machining jig and a grinding method which can change the degree of grinding without changing the kind of media or the length of the grinding time. Further, the present invention is not limited to the case where the kind of the medium or the length of the grinding processing time is not changed, and the kind of the medium or the length of the grinding processing time may be changed in combination.

(measures taken to solve the problems)

A first aspect of the present invention is to provide a machining jig which holds a workpiece to be ground by barrel polishing and which is thrown into a running grinding groove of a barrel polishing apparatus, the machining jig comprising: a main body part formed with a counterweight housing part; a counterweight replaceably accommodated in the counterweight accommodating section; and a holding member that holds the plurality of workpieces on the main body.

The second embodiment of the present invention provides a grinding method using the machining jig of the present invention, which holds a plurality of workpieces to be machined, and drops into the grinding groove of the drum grinder, and the grinding groove is operated to grind the workpieces in the state of the machining jig.

(effects of the utility model)

According to the utility model discloses a add clamping apparatus that cylinder grinding used, it need not to change the degree that the kind of medium and the length of grinding process time also can change the grinding.

Drawings

Fig. 1 is a perspective view showing a state in which a plurality of link members constituting a band of a wristwatch, which is an example of a workpiece to be ground by barrel polishing, are held by a machining jig according to an embodiment of the present invention.

Fig. 2 is a front view of the machining jig for holding the link member shown in fig. 1 as viewed from the front.

Fig. 3 is a sectional view showing a section along line a-a of fig. 2.

Fig. 4 is an exploded perspective view of the machining jig shown in fig. 1 exploded into constituent parts.

Fig. 5 is a schematic view showing a state in which the processing jig holding the plurality of link members shown in fig. 1 to 4 is put into a centrifugal grinding groove of the tension drum grinding machine, which rotates and revolves, and is stirred together with the medium.

Fig. 6 is a perspective view showing a state in which a plurality of substantially annular watchcases of a wristwatch, which is an example of a workpiece to be processed by barrel polishing and grinding, are held by a processing jig 110 as a modification.

Fig. 7 is a front view of a jig holding the wristwatch case shown in fig. 6, as viewed from the front.

Fig. 8 is a sectional view showing a section taken along line B-B of fig. 7.

Fig. 9 is an exploded perspective view showing the machining jig shown in fig. 6 exploded into constituent members.

Detailed Description

Next, embodiments of the machining jig and the polishing method using the same according to the present invention will be described with reference to the drawings.

< machining jig >

Fig. 1 is a perspective view showing a state in which a plurality of link members 100 are held by a processing jig 10 according to an embodiment of the present invention, the link members 100 constituting a band of a wristwatch as an example of a workpiece (hereinafter simply referred to as a workpiece) to be ground by barrel polishing, fig. 2 is a front view of the processing jig 10 holding the link members 100 shown in fig. 1 as viewed from the front, fig. 3 is a sectional view showing a section taken along the line a-a of fig. 2, and fig. 4 is an exploded perspective view showing the processing jig 10 shown in fig. 1 exploded into constituent parts.

Fig. 5 schematically shows a view of the processing jig 10 holding the plurality of link members 100 shown in fig. 1 to 4 when it is put into the polishing tank 400 and stirred with the medium 300, and the centrifugal polishing tank 400 rotates or revolves in the stretching barrel polishing apparatus.

The processing jig 10 shown in fig. 1 to 4 holds a plurality of link members 100 of a band of a wristwatch at positions where they do not contact each other, and drops (sets) them into a polishing groove 400 of the barrel polishing device shown in fig. 5. In the polishing tank 400, a medium 300 for polishing is put in addition to the processing jig 10. The polishing tank 400 performs operations such as rotation and revolution.

Accordingly, the medium 300 and the machining jig 10 move in the grinding tank 400, respectively, and relative friction is generated between the medium 300 and each link member 100 held by the machining jig 10, and the surface of the link member 100 is ground by the friction.

As shown in fig. 1 to 4, the machining jig 10 includes a main body 20, a weight 50, and a holding member 40.

The main body portion 20 includes: a body member 21 formed in a prism shape; the stub-like end members 22 that are respectively in contact with the two end surfaces 21b of the body member 21 are fixed by screws 60. The main body 20 is made of, for example, a hard resin, but the material is not limited to the resin.

The length of the end member 22 in the diametrical direction (direction in a plane orthogonal to the axial direction C) of the body member 21 is formed to be considerably longer than the length of the body member 21. The considerably long means that the outer peripheral surface 22c of the end member 22 may be in a state of protruding more than the link member 100 in the diameter direction in a state where the link member 100 is held on the outer peripheral surface 21a of the main body member 21 by the holding member 40 as described later.

As shown in fig. 4, a weight housing portion 28 is formed in the center of the body member 21, and the weight housing portion 28 is a columnar space extending in the axial direction C of the prism. The weight housing portion 28 is formed to penetrate between both end surfaces 21b of the body member 21. Therefore, the length of the weight housing portion 28 in the axial direction C coincides with the length of the body member 21 in the axial direction C.

In the end member 22, a screw hole 22b for passing the screw 60 is formed to penetrate between both end surfaces 22 a. A screw hole 27 for fixing the screw 60 is formed in the end surface 21b of the body member 21 at a position corresponding to the screw hole 22 b. In a state where the end members 22 are in contact with the respective end surfaces 21b of the body member 21, the screws 60 are screwed into the screw holes 22b, whereby the screws 60 are fixed to the screw holes 27 of the body member 21, respectively, and the end members 22 are fixed to the body member 21. In addition, each end member 22 can be separated from the body member 21 by loosening the screw 60.

The weight housing 28 is formed into a columnar closed space by fixing the end members 22 to the end surfaces 21b of the body member 21 with screws 60.

The weight 50 is accommodated in the weight accommodating portion 28. The weight 50 is formed to be smaller in size than the weight accommodating portion 28. Specifically, the weight 50 is formed in, for example, a rod-like cylindrical shape having an outer diameter smaller than the inner diameter of the weight housing 28, and a length in the longitudinal direction thereof is formed shorter than the length of the weight housing 28 in the axial direction C. In addition, the length of the counterweight 50 is set to a slightly shorter extent with respect to the counterweight housing 28, and there is no large movement of the counterweight 50 in the counterweight housing 28 in the axial direction C.

Accordingly, the counterweight 50 accommodated in the counterweight accommodation portion 28 can move in the counterweight accommodation portion 28 in the axial direction C and the radial direction.

Further, by separating (separating) the end member 22 from the body member 21, the counterweight 50 accommodated in the counterweight accommodation portion 28 can be replaced with another counterweight.

The holding member 40 includes: a wire 41; a sleeve 45;

sleeve pads

46, 47, 48; and a screw 49.

The wire 41 is formed into a thin rod shape extending in the axial direction C. The wires 41 are respectively passed through connection holes respectively formed at each link member 100. A plurality of (12 in the structure shown in the figure) link members 100 are penetrated by one wire 41 and arranged in the longitudinal direction. In addition, since two connection holes are formed in the link members 100, respectively, the two

wires

41, 41 are passed through the respective link members 100 in order to pass through the respective connection holes of each link member 100, respectively.

Further, one wire 41 of the two

wires

41, 41 is provided with a sleeve 45, the sleeve 45 is disposed between the link members 100 and has a larger outer diameter than the connection hole of each link member 100, and the sleeve 45 is used to maintain a gap between two link members 100 adjacent in the longitudinal direction among the plurality of link members 100 passed therethrough. Accordingly, even if the form (posture) of the machining jig 10 changes, the relative position between the link members 100 can be maintained, the link members 100 can be prevented from contacting each other, and scratches caused by the contact and the side surfaces of the link members 100 can be prevented from being surrounded (covered) by other link members 100 and not being ground.

The two longitudinal end portions and the longitudinal middle portion of the two

wires

41, 41 passing through each link member 100 are provided with each set of

pads

46, 48, 47. Each set of

pads

46, 47, 48 passes through the two wires 41, and is in contact with the outer peripheral surface 21a of the body member 21 through one end face, so that the two

wires

41, 41 are supported in a state of floating from the outer peripheral surface 21 a.

Further, a screw 49 is passed through each of the

pads

46, 47, 48 from the other end face side, and the

pads

46, 47, 48 are fixed to the body member 21 by screwing the screw 49 at a screw hole 23 (see fig. 4) formed on the outer peripheral surface 21 a. Accordingly, each link member 100 is held on the body member 21.

As shown in fig. 3, the holding members 40 are provided so as to correspond to respective planes in the circumferential direction of the body member 21 (respective planes formed on the peripheral surface of the prism). Therefore, the link members 100 can be held along the entire circumference in the circumferential direction of the body member 21, and the plurality of link members 100 can be held in a state in which the relative positional relationship is maintained.

The machining jig 10 configured as described above is put into the rotating and revolving grinding groove 400 shown by an arrow, for example, of the centrifugal barrel grinding apparatus shown in fig. 5 together with the medium 300 while holding the plurality of link members 100.

The machining jig 10 and the medium 300 are agitated by the operation (rotation) of the rotating and revolving grinding tank 400, and the link member 100 can be ground by the friction generated between the link member 100 held by the machining jig 10 and the medium 300.

At this time, although a plurality of link members 100 are put into the grinding groove 400, since the link members 100 are held at predetermined positions of the respective processing jigs 10 at intervals, the link members 100 do not contact each other, and therefore, it is possible to prevent scratches and dents from being generated when the link members 100 contact each other.

Further, the machining jig 10 can remove the end member 22 from the body member 21 by loosening the screw 60, whereby the weight 50 accommodated in the weight accommodating portion 28 can be replaced. Therefore, a plurality of types of weights 50 having different weights are prepared in advance as the weights 50 accommodated in the weight accommodating portion 28 according to the difference in material and the difference in size, and one or more of the plurality of types of weights 50 can be selected to replace the weight of the machining jig 10.

Accordingly, the centrifugal force (dependent on the weight) acting on the machining jig 10 in the polishing groove 400 (that is, in a state where the machining jig 10 is put into the polishing groove 400) can be increased or decreased. Further, since the intensity of the polishing process can be increased by increasing the centrifugal force and can be decreased by decreasing the centrifugal force, the intensity of the polishing process can be changed without changing the kind of the medium 300, the length of the polishing process time, the rotation speed of the polishing tank 400, and the like.

Of course, the intensity of the polishing process can be changed by changing the type of the medium 300, the length of the polishing time, and the rotation speed of the polishing tank 400.

In addition, since the machining jig 10 is not fixed to the grinding groove 400, it moves within the grinding groove 400 according to the movement of the medium 300 and the applied centrifugal force. At this time, when the machining jig 10 ascends inside the grinding groove 400 and then moves (drops) downward, in the case of the machining jig (position fixing jig) shown in the related art, the machining jig hits the medium 300 existing at the drop point and bounces.

As described above, when the machining jig bounces, the workpiece held by the machining jig is separated from the medium 300, and therefore, the grinding process is not performed during the separation. Therefore, the processing time required to complete the desired degree of polishing becomes long.

However, in the machining jig 10 of the present embodiment, even when the machining jig 10 falls after being lifted, the counterweight 50 accommodated in the counterweight accommodating portion 28 moves inside the counterweight accommodating portion 28 to absorb the reaction force of the falling, and therefore, the bounce of the machining jig 10 can be prevented or suppressed.

Therefore, the extension of the machining time due to the bounce of the machining jig 10 can be prevented or suppressed.

In addition, the machining jig 10 of the present embodiment can restrict the dimension of the counterweight 50 that is movable in the counterweight housing portion 28 in the axial direction C to some extent. In other words, the rod-shaped weight 50 is less likely to cause a large deflection toward one end side in the axial direction C and is less likely to cause an imbalance in the weight distribution in the axial direction C, as compared with the structure of the weight 50 formed in the pellet shape.

As a result, the rod-like configuration of counterweight 50 can reduce the change in the posture (attitude) of machining jig 10 in grinding groove 400 (the degree of balance between axial direction C of machining jig 10 and the rotation axis of grinding groove 400) as compared with the case of the spherical configuration. Therefore, the machining jig 10 can prevent and suppress unevenness in the degree of polishing of the link member 100 by reducing the variation in the posture of the machining jig 10.

In addition, in the machining jig 10, in a state where a plurality of link members 100 are held, the outer peripheral surfaces 22c of the end members 22 at both ends protrude in the diameter direction from the held link members 100. Therefore, when the machining jig 10 is dropped downward after the inside of the grinding groove 400 is raised and the machining jig 10 is caused to collide with the medium 300 existing at the drop point, the outer peripheral surfaces 22c of the end members 22 at both ends first collide with the medium 300, and then the link member 100 held at the radially inner side than the outer peripheral surfaces 22c of the end members 22 at both ends collides with the medium 300.

Therefore, the outer peripheral surfaces 22c of the end members 22 of both ends that collide first generate a strong contact collision with the medium 300, thus reducing the strength of the contact collision between the link member 100 and the medium 300 that collide later. Therefore, the link member 100 held on the processing jig 10 can suppress and prevent scratches and dents generated due to contact collision with the medium 300 when dropped, as compared to the link member held on the processing jig which is not formed with the end members 22 where the link member 100 protrudes from both ends.

< modification example >

The machining jig 10 of the embodiment described above is configured to hold the link member 100 of the band of the wristwatch as the workpiece on the body portion 20, but the workpiece held by the machining jig is not limited to the link member 100.

Fig. 6, 7, 8 and 9 are views showing a modification of the embodiment shown in fig. 1 to 4, fig. 6 is a perspective view showing a state in which a plurality of substantially annular wristwatch cases 200, which are examples of a workpiece to be processed by barrel polishing and grinding, are held by a processing jig 110 as a modification, fig. 7 is a front view showing the processing jig 110 holding the wristwatch cases 200 shown in fig. 6 as viewed from the front, fig. 8 is a cross-sectional view showing a cross-section taken along the line B-B of fig. 7, and fig. 9 is an exploded perspective view showing the processing jig 110 shown in fig. 6 exploded into constituent parts.

The machining jig 110 shown in fig. 6 to 9 holds the wristwatch cases 200 in a mutually non-contact position, and similarly to the machining jig 10, drops into the grinding groove 400 of the barrel grinding device shown in fig. 5. Accordingly, the medium 300 and the processing jig 110 move in the grinding groove 400, and relative friction is generated between the medium 300 and the wristwatch case 200 held by the processing jig 110, and the surface of the wristwatch case 200 is ground by the friction.

As shown in fig. 6 to 9, the machining jig 110 includes: body portion 120, counterweight 150, and retaining member 140.

The body part 120 is formed in a quadrangular prism shape. The main body portion 20 is formed of, for example, a hard resin, but the material is not limited to the resin.

As shown in fig. 6 and 9, a weight accommodating portion 128 is formed at the center of the body portion 120, and the weight accommodating portion 128 is a cylindrical hole extending in the axial direction C of the prism. The weight accommodating portion 128 is formed to penetrate between both end surfaces 126 of the body portion 120. Therefore, the length of the weight accommodating portion 128 in the axial direction C coincides with the length of the body portion 120 in the axial direction C.

The weight 150 is accommodated in the weight accommodating portion 128. The counterweight 150 is formed to have substantially the same size as the counterweight housing 128. Specifically, the weight 150 is formed into, for example, a rod-like cylindrical shape, and has an outer diameter having substantially the same size as the inner diameter of the weight housing 128, and a length in the longitudinal direction thereof having substantially the same length as the length of the weight housing 128 in the axial direction C. Thus, the weight 150 is pressed into the weight accommodating portion 128.

Further, the counterweight 150 can be detached from the counterweight housing section 128 and separated from the main body section 120, and can be replaced with another counterweight and mounted in the main body section 120.

As shown in fig. 9, the holding member 140 includes a support member 141 and a screw 145. The support member 141 is formed in a circular convex shape. The circular outer shape of the support member 141 is formed slightly smaller than the inner diameter of the wristwatch case 200. The thickness of the support member 141 is formed larger than the height (dimension in the thickness direction) of the wristwatch case 200.

A screw hole 141b penetrating in the thickness direction is formed in the circular center of the support member 141. Screw hole 141b is formed in a tapered shape and has a smaller inner diameter downward from upper surface 141a side of support member 141.

The support member 141 is formed with a + shaped gap centered around the screw hole 141b, and illustration thereof is omitted. Although the outer diameter of the support member 141 is slightly smaller than the inner diameter of the wristwatch case 200, the screw 145 is screwed into the screw hole 141b, and the taper of the screw hole 141b is pressed downward by the head of the screw 145 to widen the gap.

Therefore, the wristwatch case 200 is disposed outside the support member 141 so that the support member 141 is positioned inside the inner peripheral surface of the wristwatch case 200, and in this state, by screwing the screw 145 into the screw hole 141b, the outer peripheral surface of the support member 141 is brought into contact with the inner peripheral surface of the wristwatch case 200 to press the entire inner peripheral surface radially outward, and the support member 141 supports the wristwatch case 200.

As shown in fig. 8, the screw 145 screwed into the screw hole 141b completes the coupling when the lower surface 141c of the support member 141 abuts against the peripheral surface 121 until the screw hole 123 formed in each of the planar peripheral surfaces 121 of the body 120 is screwed, and the support member 141 is fixed to each of the peripheral surfaces 121, whereby the holding member 140 holds the wristwatch case 200 to the body 120.

Further, in a state where the lower surface 141c of the support member 141 abuts against the peripheral surface 121, the upper surface of the support member 141 protrudes above the upper surface of the held wristwatch case 200.

Since the interval between the screw holes 123 formed in the body portion 120 is formed to be larger than the outer dimension of the held wristwatch case 200, the plurality of wristwatch cases 200 held on the respective peripheral surfaces 121 are held in a state of not being in contact with each other.

As shown in fig. 6, the holding members 140 are provided so as to correspond to the respective peripheral surfaces 121 of the body portion 120, respectively, and can hold the wristwatch case 200 over the entire circumference of the body portion 120 and can be held in a state in which the plurality of wristwatch cases 200 are maintained in a relative positional relationship.

The machining jig 110 configured as described above is put into the grinding groove 400 for performing rotation and revolution as indicated by the arrow of the centrifugal barrel grinding apparatus shown in fig. 5 together with the medium 300 in a state where a plurality of the watchcases 200 are held, and grinds the watchcases 200.

At this time, a plurality of the watchcases 200 are put into the grinding groove 400, but since the watchcases 200 are respectively held at predetermined positions of the processing jig 110 and are spaced apart from each other, the watchcases 200 do not contact each other, and therefore, scratches and dents caused by the mutual contact of the watchcases 200 can be prevented.

In addition, the machining jig 110 can remove and replace the counterweight 150 from the counterweight housing section 128 of the body section 120. Therefore, a plurality of types of weights 150 having different weights are prepared in advance as the weights 150 accommodated in the weight accommodating portion 128 according to the material and the length, and one or two or more types of weights 150 can be selected from the plurality of types of weights 150 to change the weight of the machining jig 110.

Accordingly, by increasing or decreasing the centrifugal force (depending on the weight) acting on the processing tool 110 in the state of being introduced into the polishing tank 400, the intensity of the polishing can be reduced, and the intensity of the polishing can be changed without changing the type of the medium 300, the length of the polishing time, the rotation speed of the polishing tank 400, and the like.

The intensity of polishing can also be changed by changing the type of the medium 300, the length of the polishing time, and the rotation speed of the polishing tank 400.

Further, in a state where the plurality of wristwatch cases 200 are held by the machining jig 110, the upper surface 141a of the support member 141 protrudes from the held wristwatch cases 200 in a direction perpendicular to the axial direction C. Therefore, when the machining jig 110 is lowered after the inside of the grinding groove 400 is raised, and the machining jig 110 is brought into collision contact with the medium 300 existing at the drop point, the upper surface 141a of the support member 141 first hits (collides) the medium 300, and thereafter the wristwatch case 200 is brought into collision contact with the medium 300, the wristwatch case 200 being held further inward than the straight line connecting the upper surfaces 141a of the plurality of support members 141.

Therefore, strong collision contact is generated between the upper surface 141a of the support member 141 which is struck first and the medium 300, and the strength of the contact collision between the wristwatch case 200 and the medium 300 which is brought into collision contact thereafter is weakened. Therefore, the watch case 200 held at the machining jig 110 can prevent and suppress the generation of scratches and dents with the medium 300 by dropping, as compared with the link member held on the machining jig which is not formed to protrude from the upper surface 141a of the support part of the watch case 200.

The machining jig 110 of the modification has a structure in which the weight 150 does not move inside the weight housing 128, but like the embodiment, the weight 150 is formed smaller than the weight housing 128, and a structure in which the weight 150 moves inside the weight housing 128 may be adopted. In this case, by the movement of the weight 150 in the weight housing 128, it is possible to absorb a reaction force acting on the machining jig 110 and causing the machining jig 110 to bounce, and to prevent or suppress the machining jig 110 from bouncing up.

In addition, when the counterweight 150 is configured to be movable in the counterweight housing section 128, it is preferable to employ a configuration in which the same member as the end member 22 of the machining jig 10 according to the embodiment is closed in the opening portion of the counterweight housing section 128 of the end surface 126 of the body section 120 so that the counterweight 150 does not fall off from the counterweight housing section 128.

In the machining jig 10 of the above-described embodiment and the machining jig 110 of the modified example, the

main bodies

20 and 120 are both prism-shaped, but the shape of the main body may be cylindrical or may have another shape.

In the machining jig 10 of the above-described embodiment, although the weight housing 28 is filled with air together with the weight 50, the weight housing 28 may be filled with a liquid or gel-like substance such as water or oil in addition to air to provide a damper function for reducing the movement energy of the weight 50.

While the example in which the link member 100 of the band of the wristwatch and the wristwatch case 200 are used as the workpiece is applied to the machining jig 10 or the machining jig 110 of the modification and the grinding method using the machining jigs 10 and 110 of the above embodiment, the machining jig and the grinding method using the machining jig of the present invention are not limited to the example in which the workpiece is applied to the link member 100 or the wristwatch case 200, and the bezel, the back cover, and the like can be applied to the workpiece.

Further, the present invention is not limited to the case of being applied to a timepiece component as a workpiece, and any object can be applied as a workpiece as long as it is a workpiece to be processed by barrel polishing.

(mutual citation of related applications)

The present application is based on the priority claim of Japanese patent application No. 2019-049512, the entire disclosure of which is incorporated by reference into the present specification.

(symbol description)

10 processing clamp

20 main body part

28 counterweight housing

40 holding member

49, 60 screw

50 balance weight

100 link member

400 grind groove

Claims

1. A processing jig for holding a workpiece to be polished by barrel polishing and for feeding the workpiece into a polishing tank in operation of a barrel polishing apparatus,

the machining jig is provided with:

a main body part formed with a counterweight housing part;

a counterweight replaceably accommodated in the counterweight accommodating section;

and a holding member that holds the plurality of workpieces on the main body.

2. The machining jig of claim 1,

in the counterweight housing portion, a plurality of types of counterweights having different weights are replaceably housed as the counterweight.

3. The machining jig of claim 1,

the weight housing section is formed to be smaller than the weight or the weight is formed to be smaller than the weight housing section so that the weight housed in the weight housing section moves in accordance with the movement of the machining jig.

4. The machining jig of claim 2,

5. The machining jig according to any one of claims 1 to 4,

the main body part is formed in a columnar shape,

the weight accommodating portion is formed in a central portion of the body portion and is formed by a space extending in a columnar axial direction of the body portion,

the weight is formed in a bar shape extending in a direction corresponding to the longitudinal direction.