Low stress fixture and clamping method

Abstract

The application discloses a low-stress clamp and a clamping method, the low-stress clamp comprising a suction cup, a sliding ring mechanism mounted on the suction cup and a swing arm structure capable of driving the sliding ring mechanism to translate, the sliding ring mechanism comprising a sliding ring body and a sliding ring sleeve coaxially connected, the suction surface of the suction cup is provided with a plurality of suction parts, the cavity in the suction cup and the suction parts are communicated, the communication channel in the sliding ring body is communicated with the cavity, the annular channel between the sliding ring body and the sliding ring sleeve and the vacuum pipe communicated with the annular channel on the sliding ring sleeve, and the air in the cavity is sucked to enable the plurality of suction parts to uniformly adsorb the parts to be polished; the clamping method is as follows: the sliding ring mechanism and the suction cup are assembled, the suction parts contact the parts to be polished on the polishing disc, the external air suction part is opened to adsorb the parts to be polished, and then the swing arm structure is made to abut against the sliding ring body; the surface of the parts to be polished after clamping can be guaranteed to be flat through vacuum adsorption, the polishing quality is improved, the clamping is fast and convenient, and the machining efficiency is improved.

Description

Technical Field

[0001] This disclosure relates to the field of optical processing technology, specifically to low-stress fixtures and clamping methods. Background Technology

[0002] Classical optical processing technology is one of the main manufacturing methods for high-precision planar optical components. Currently, this method mainly uses a dispensing and mounting process to clamp the parts. Dispensing and mounting generally requires manual operation, and the distribution, size, and shape of the adhesive dots must be kept uniform. This requires a certain level of operational skill, and the dispensing process accounts for a significant portion of the operation time in classical grinding and polishing. The size and position of the adhesive dots affect the clamping stress of the parts. Traditional processes often use asphalt for dispensing. After the asphalt solidifies, planar optical windows with large diameter-to-thickness ratios become uneven, making them prone to deformation during grinding and polishing. This is especially true for irregularly shaped optical windows with non-rotationally symmetrical outer contours. The mirror disk will rotate irregularly during processing, resulting in uncertainty in the surface removal rate and affecting the surface accuracy.

[0003] Therefore, improving the mounting method for planar optical components can effectively enhance surface accuracy stability and production efficiency. To this end, this invention proposes a low-stress fixture and clamping method. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a low-stress fixture and clamping method.

[0005] In a first aspect, this application provides a low-stress clamp, comprising:

[0006] A suction cup, wherein the suction cup has a cavity inside, the suction cup has an adsorption surface at its end, and the adsorption surface has a plurality of adsorption parts that communicate with the cavity and are used to adsorb the parts to be polished;

[0007] A slip ring mechanism, comprising a slip ring body and a slip ring bushing, wherein the slip ring body is rotatably mounted within the slip ring bushing along a first axis perpendicular to the adsorption surface, and an annular channel is formed between the inner wall of the slip ring bushing and the outer wall of the slip ring body; the slip ring body is fixedly mounted on the suction cup, and a communicating channel connecting the annular channel and the cavity is provided inside the slip ring body;

[0008] A vacuum tube, one end of which is fixedly mounted on the slip ring bushing and communicates with the annular channel; the other end of which is used to extract air from the cavity so that the part to be polished is adsorbed onto the adsorption surface.

[0009] According to the technical scheme provided by the embodiment of the application, the swing arm structure can drive the suction cup to translate, and the swing arm structure comprises a swing arm, the swing arm axis is parallel to the adsorption surface, and is perpendicular to the first axis;

[0010] The swing arm structure further comprises two slide pens arranged on the swing arm, one of the slide pens is provided with a slide pen along the first axis, the bottom of the slide pen is provided with a connecting head, the top of the slide ring body is provided with a groove, the connecting head extends into the groove and is rotationally connected with the groove.

[0011] The bottom of the other slide pen is fixedly provided with a shift fork parallel to the first axis, and the bottom of the shift fork is provided with a limiting portion for limiting the vacuum tube.

[0012] According to the technical scheme provided by the embodiment of the application, the swing arm top is fixedly provided with a slide bar extending parallel to the axis, the slide pen comprises a first support and a second support arranged in an array, first and second openings are respectively formed in the side walls of the first and second supports close to each other, the first and second openings are oppositely arranged and form a through space for the swing arm and the slide bar to penetrate.

[0013] According to the technical scheme provided by the embodiment of the application, the slide ring body has a shaft and a flange fixedly connected coaxially and integrally formed, the flange is arranged at the bottom of the shaft, the flange and the suction cup are fixedly connected through a mounting piece, the slide ring sleeve is coaxially rotationally arranged on the outer wall of the shaft, and the annular channel is located between the shaft and the slide ring sleeve.

[0014] Two bearings are coaxially arranged in the annular channel, sealing pieces are arranged at the top and bottom of the annular channel, a retainer ring is arranged at the top of the sealing piece at the top, a retainer ring is also arranged at the bottom of the sealing piece at the bottom, the sealing pieces are used to seal the annular channel, and the retainer rings are used to limit the bearings.

[0015] According to the technical scheme provided by the embodiment of the application, a third channel is formed at the center of the top of the suction cup, a plurality of fourth channels are arranged in the suction cup corresponding to the plurality of adsorption portions, one end of each of the plurality of fourth channels is in communication with one of the plurality of adsorption portions, and the other end of each of the plurality of fourth channels is in common communication with the third channel, and the third channel and the fourth channels form the cavity.

[0016] According to the technical scheme provided by the embodiment of the application, a first channel is formed through the shaft in the radial direction, a second channel is formed in the flange at the center of the bottom end surface in the axial direction of the shaft, and the first channel and the second channel are in communication to form a communication channel.

[0017] The first channel and the annular channel are in communication, and the second channel is connected to the third channel at an end away from the first channel.

[0018] According to the technical scheme provided in the embodiments of the present application, the first locking hole is arranged on the side wall of the first support and the second support away from each other, the first locking hole is in communication with the through space, and the first locking member is arranged in the first locking hole and abuts against the swing arm to fix the stylus support on the swing arm.

[0019] According to the technical scheme provided in the embodiments of the present application, a through hole is arranged on one of the first supports in a direction perpendicular to the swing arm axis, the stylus is arranged in the through hole, and a second locking hole in communication with the through hole is arranged on the side wall of the first support away from the second support opposite to the first support, a second locking member is arranged in the second locking hole and abuts against the stylus to limit the stylus, and the yoke is fixedly arranged at the bottom of the other first support.

[0020] In a second aspect, the present application provides a clamping method applied with the low-stress clamp, and the clamping method comprises the following steps:

[0021] S01, placing a part to be polished on a polishing disc;

[0022] S02, installing the slip ring mechanism on the suction disc by using the installation member;

[0023] S03, placing the suction disc on the top of the part to be polished;

[0024] S04, connecting the vacuum tube to the external air suction member to generate a negative pressure suction force on the adsorption part to adsorb the part to be polished;

[0025] S05, adjusting the positions of the two stylus supports to make the connecting head of the stylus enter the groove and make the limiting part of the yoke limit the vacuum tube.

[0026] In summary, the technical scheme specifically discloses a low-stress clamp and a clamping method. The low-stress clamp comprises a suction disc, the bottom end surface of the suction disc is an adsorption surface, a plurality of adsorption parts are arranged on the adsorption surface, and a cavity in communication with the adsorption parts is arranged in the suction disc. A slip ring structure is installed on the suction disc, which comprises a slip ring body and a slip ring shaft sleeve. The slip ring body is coaxially arranged in the slip ring shaft sleeve, and an annular channel is formed between the slip ring shaft sleeve and the slip ring body. The slip ring body has a communication channel in communication with the annular channel and the cavity. A vacuum tube in communication with the annular channel is arranged on the slip ring shaft sleeve. The negative pressure suction force is generated on the adsorption part by sucking the air in the cavity through the vacuum tube, so as to adsorb the part to be polished.

[0027] The swing arm structure can drive the suction cup to translate by the connecting head connecting the sliding ring body, so as to drive the part adsorbed by the adsorption part to translate, and then polish the part. The swing arm structure has a limiting part limiting the vacuum tube;

[0028] The clamping method applies the low-stress clamp. The use steps are as follows: first, place the part to be polished on the polishing disc, so that the machined surface of the part faces the polishing disc; then connect the suction cup and the sliding ring mechanism; then contact the clamping surface of the upper end surface of the part with the adsorption part of the suction cup; generate suction force on the adsorption part through the external air suction member; finally, press the sliding ring body with the swing arm structure, and limit the vacuum tube with the limiting part. Rotate the part to be polished through the rotation of the polishing disc, and translate the part to be polished on the polishing disc through the translation of the swing arm structure. The relative rotation of the vacuum tube and the part to be polished ensures that the adsorption part continuously adsorbs the part to be polished during polishing, without affecting the polishing work.

[0029] The clamp of the present application adsorbs the part to be polished by vacuum adsorption, can clamp the large-diameter-thickness-ratio special-shaped optical window, replaces the traditional glue dispensing method, and does not cause unevenness on the surface of the part to be polished. The clamping is fast and convenient, improves the processing efficiency, and ensures the polishing precision. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of a low-stress clamp structure.

[0032] Figure 2 It is a partial structure sectional view of a low-stress clamp.

[0033] Figure 3 It is a schematic diagram of a sliding ring shaft sleeve structure.

[0034] Figure 4 It is a schematic diagram of a sliding ring body structure.

[0035] Figure 5 It is a schematic diagram of a bearing inner sleeve structure.

[0036] Figure 6 It is a schematic diagram of a bearing outer sleeve structure.

[0037] Figure 7 It is a clamping method step.

[0038] The figure labels: 1, suction cup; 2, vacuum tube; 3, part; 4, connector; 5, slip ring body; 6, flange; 7, mounting counterbore; 8, first channel; 9, second channel; 10, groove; 11, slip ring shaft sleeve; 12, first through hole; 13, bearing; 14, bearing inner sleeve; 15, second through hole; 16, bearing outer sleeve; 17, third through hole; 18, sealing element; 19, check ring; 20, swing arm; 21, slide bar; 22, first support; 23, first locking element; 24, stylus; 25, second locking element; 26, yoke. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not a limitation of the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0040] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the examples.

[0041] Example 1

[0042] Please refer to Figure 1 and Figure 4 A low-stress clamp is shown, which includes a suction cup 1, the suction cup 1 is provided with a cavity, and the bottom end surface of the suction cup 1 is an adsorption surface, and a plurality of adsorption parts are provided on the adsorption surface and are in communication with the cavity, the adsorption parts can adsorb a part to be polished 3;

[0043] The slip ring mechanism includes a slip ring body 5 and a slip ring shaft sleeve 11, the slip ring body 5 can rotate along a first axis, and the slip ring body 5 is rotatably arranged inside the slip ring shaft sleeve 11, the first axis is Figure 2 the vertical direction in the middle, and the first axis is perpendicular to the adsorption surface, an annular channel is formed between the inner wall of the slip ring shaft sleeve 11 and the outer wall of the slip ring body 5, a communication channel is provided inside the slip ring body 5 and is in communication with the annular channel, the slip ring body 5 is fixedly installed at the top of the suction cup 1, and the communication channel is in communication with the cavity;

[0044] Specifically, a third channel is provided at the center of the top of the suction cup 1, a plurality of fourth channels are provided inside the suction cup 1 corresponding to the plurality of adsorption parts, one end of each of the plurality of fourth channels is in communication with one of the plurality of adsorption parts, and the other end is in common communication with the third channel; the third channel and the fourth channels form the cavity;

[0045] The slip ring body 5 has a rotating shaft and a flange 6 coaxially fixedly connected and integrally formed along the first axis direction, the rotating shaft is arranged at the top of the flange 6, and the flange 6 and the suction cup 1 are fixedly connected through a mounting piece. Optionally, three mounting counterbores 7 are uniformly arranged on the flange 6 in the circumferential direction parallel to the axis direction, and the suction cup 1 is provided with three mounting holes at the top corresponding to the three mounting counterbores 7. The mounting piece extends through the mounting counterbores 7 into the mounting holes, so that the flange 6 and the suction cup 1 are connected. The type of the mounting piece is, for example, a screw.

[0046] A first channel 8 is arranged through the rotating shaft in the radial direction thereof, and a second channel 9 is arranged at the center of the bottom end surface of the flange 6 in the direction of the rotating shaft along the first axis. The second channel 9 and the first channel 8 are connected in communication to form a communication channel, and the end of the second channel 9 away from the first channel 8 is connected with a third channel.

[0047] The slip ring shaft sleeve 11 is coaxially arranged in rotation on the outer wall of the rotating shaft, the annular channel is the gap between the slip ring shaft sleeve 11 and the rotating shaft, a first through hole 12 is arranged through the slip ring shaft sleeve 11 in the radial direction thereof, a vacuum tube 2 is fixedly arranged at the first through hole 12, one end of the vacuum tube 2 is connected with the annular channel, and the other end is used for connecting an external air suction piece. By opening the external air suction piece, the air inside the communication channel and the cavity can be extracted, so that a negative pressure suction force is generated at the adsorption part to adsorb the part to be polished 3.

[0048] It should be noted that a sealing ring can be arranged at the connection between the second channel 9 and the third channel to achieve a sealing effect.

[0049] Two bearings 13 are coaxially arranged inside the annular channel along the first axis, the inner ring of the bearing 13 is connected with the outer wall of the rotating shaft, and the outer ring of the bearing 13 is connected with the inside of the slip ring shaft sleeve 11, so that the slip ring shaft sleeve 11 and the slip ring body 5 are rotationally connected.

[0050] Sealing pieces 18 are arranged at the top end and the bottom end inside the annular channel, a retaining ring 19 is arranged at the top of the upper end sealing piece 18, and a retaining ring 19 is also arranged at the bottom of the lower end sealing piece 18. The sealing piece 18 can seal the annular channel, which can be a sealing ring or the like, to prevent gas leakage and ensure the negative pressure suction force at the adsorption part. The retaining ring 19 is used for limiting the sealing piece 18 and the bearing 13.

[0051] As shown in Figure 2 , Figure 5 and Figure 6 , a bearing inner sleeve 14 is arranged between the two bearings 13, the bearing inner sleeve 14 is connected with the inner ring of the bearing 13, the outer rings of the two bearings 13 are jointly connected with a bearing outer sleeve 16, four second through holes 15 are uniformly arranged through the circumferential side wall of the bearing inner sleeve 14, four third through holes 17 are uniformly arranged through the circumferential side wall of the bearing outer sleeve 16, the second through holes 15 and the third through holes 17 are connected with the annular channel, and the second through holes 15 are connected with the first channel.

[0052] As shown in Figure 1 The low-stress clamp also includes a swing arm structure, which includes a swing arm 20 in a cylindrical structure with an axis parallel to the adsorption surface. A sliding bar 21 is fixedly arranged on the top of the swing arm 20 along the axis direction. Two iron pen supports are slidingly arranged on the outer wall of the swing arm 20. The iron pen supports include a first support 22 and a second support arranged along the axis perpendicular to the swing arm 20. The first support 22 and the second support are respectively provided with a first opening and a second opening on the side wall close to each other, and the first opening and the second opening are oppositely arranged to form a through space capable of accommodating the swing arm 20 and the sliding bar 21 passing through. Thus, the iron pen support can move on the swing arm 20 along the length direction of the swing arm 20.

[0053] The side walls of the first support 22 and the second support away from each other are respectively provided with two first locking holes, and the first locking holes are in communication with the through space. A first locking member 23 is movably arranged in the first locking hole. The first locking member 23 abuts against the swing arm 20, so as to lock the position of the iron pen support on the swing arm 20. The type of the first locking member 23 is, for example, a screw.

[0054] A through hole is formed through one of the first supports 22 along the direction perpendicular to the axis of the swing arm 20. An iron pen 24 is movably arranged in the through hole. The side wall of the first support 22 away from the second support opposite thereto is provided with two second locking holes in communication with the through hole. A second locking member 25 is arranged in the second locking hole. The second locking member 25 abuts against the iron pen 24 by being screwed, so as to lock the position of the iron pen 24. The type of the second locking member 25 is, for example, a screw.

[0055] It should be noted that, as shown in Figure 1 and Figure 2 The bottom of the iron pen 24 is provided with a connecting head 4, and the top of the sliding ring body 5 is provided with a groove 10. Optionally, the connecting head 4 is a spherical head, the groove 10 is a spherical groove, the connecting head 4 extends into the groove 10 and abuts against the groove 10. One end of the swing arm 20 is connected to an external machine tool. The swing arm 20 can be translated along the direction parallel to the adsorption surface by the driving of the external machine tool. Thus, the connecting head 4 extends into the groove 10 and abuts against the groove, so as to drive the sliding ring mechanism and the suction cup 1 to translate, and further drive the part 3 adsorbed by the adsorption part to translate.

[0056] The bottom of the other first support 22 is fixedly provided with a shift fork 26 parallel to the first axis. The bottom of the shift fork 26 is provided with a limiting portion, which can be a reversed U-shaped portion, capable of limiting the vacuum tube 2.

[0057] Embodiment two

[0058] As shown in Figure 7As shown, a clamping method, using a low-stress clamp mentioned in embodiment one, the clamping method comprising the following steps:

[0059] S01, placing the part to be polished 3 on the polishing disc;

[0060] S02, installing the slip ring mechanism on the suction cup 1 using the mounting member;

[0061] S03, placing the suction cup 1 on top of the part to be polished 3;

[0062] S04, connecting the vacuum tube 2 through the external suction member to generate negative pressure suction on the adsorption part to adsorb the part to be polished 3;

[0063] S05, adjusting the position of the two iron pen supports so that the connecting head 4 of the iron pen 24 enters the groove 10, and the limiting part of the yoke 26 limits the vacuum tube 2.

[0064] Specifically, first, place the part to be polished 3 on the polishing disc, with the clamping surface of the part to be polished 3 facing upwards, then connect the flange 6 of the slip ring body 5 to the suction cup 1 using the mounting member, then place the suction cup 1 on the clamping surface of the part 3, turn on the switch of the external suction member, and adjust the vacuum pressure to 80-100 kPa to adsorb the part 3, then move the swing arm 20, adjust the position of the iron pen support on the swing arm 20, so that the connecting head 4 of the iron pen 24 enters the groove 10 at the top of the slip ring body 5 and abuts against the groove 10, and the limiting part of the yoke 26 limits the vacuum tube 2, thus completing the clamping; the part to be polished 3 is a large-diameter-thickness-ratio special-shaped optical window.

[0065] It should be noted that one end of the swing arm 20 is a free end, and the other end is connected to an external machine tool, which can drive the swing arm 20 to translate, and the connecting head 4 of the iron pen 24 can drive the slip ring mechanism to translate, such as planar arc reciprocating motion, and the low-stress clamp is applied to optical processing, the part to be polished 3 is placed on the top of the polishing disc, and the polishing disc is rotated to polish the machined surface of the bottom end face of the part to be polished 3. After the low-stress clamp is assembled, the slip ring body 5, the bearing inner sleeve 14, and the inner ring of the bearing 13 form a rotor that rotates with the part to be polished 3, and the other components and the vacuum tube 2 form a stator;

[0066] The device adopts the structure of vacuum adsorption, can make several adsorption parts uniformly adsorb the parts to be polished 3, make the machined surface of the parts to be polished 3 flat, thereby reducing the contact stress when polishing, improving the processing quality, the slip ring body 5 and the suction cup 1 also rotate in the process of polishing, the vacuum pipe 2 inevitably rotates, but due to the limiting action of the fork 26, and the bearing 13 is arranged, the slip ring shaft sleeve 11 and the vacuum pipe 2 can avoid rotating with the slip ring body 5, to ensure the normal polishing work.

[0067] The low-stress clamp and clamping method can quickly clamp the parts to be polished 3, replace the traditional disc operation, improve the processing efficiency, and improve the processing quality; at the same time, the vacuum pipe 2 and the parts to be polished 3 rotate relatively, which can ensure that the polishing and the adsorption part continuously and stably generate negative pressure to firmly adsorb the parts to be polished 3.

[0068] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form a technical solution.

Claims

1. A low stress clamp, characterized by, The utility model relates to a kind of polishing device, comprising: Suction cup (1), the cavity is equipped inside the suction cup (1), the suction cup (1) end has suction face, and the suction face is equipped with several suction parts for suctioning the part (3) to be polished with the cavity communication; Slip ring mechanism, the slip ring body (5) is rotatably mounted in the slip ring sleeve (11) along the first axis, the first axis is perpendicular to the suction face, and the annular channel is formed between the inner wall of the slip ring sleeve (11) and the outer wall of the slip ring body (5);The slip ring body (5) is fixedly installed on the suction cup (1), and the communication channel is communicated with the annular channel and the cavity in the slip ring body (5); Vacuum tube (2), one end of the vacuum tube (2) is fixedly installed on the slip ring sleeve (11), and is communicated with the annular channel;The other end of the vacuum tube (2) is used to extract the air in the cavity so that the part (3) to be polished is adsorbed on the suction face; It also includes a swing arm structure, which can drive the suction cup (1) to translate, and the swing arm structure includes a swing arm (20), the swing arm (20) axis is parallel to the suction face, and perpendicular to the first axis; The swing arm structure also includes two iron pen supports slidingly arranged on the swing arm (20), one of the iron pen supports is provided with an iron pen (24) along the first axis, the bottom of the iron pen (24) is provided with a connecting head (4), the top of the slip ring body (5) is provided with a groove (10), the connecting head (4) extends into the groove (10) and is rotatably connected with the groove (10); The bottom of the other iron pen support is fixedly provided with a shift fork (26) parallel to the first axis, and the shift fork (26) is provided with a limiting portion for limiting the vacuum tube (2).

2. A low stress clamp according to claim 1, wherein, The top of the swing arm (20) is fixedly provided with a sliding bar (21) extending parallel to its axis, the iron pen support includes a first support (22) and a second support arranged side by side, the first support (22) and the second support are respectively provided with a first opening and a second opening on the side wall close to each other, the first opening and the second opening are oppositely arranged and form a through space for the swing arm (20) and the sliding bar (21) to pass through.

3. A low stress clamp according to claim 2, wherein, The slip ring body (5) has a shaft and a flange (6) fixedly connected coaxially and integrally formed, and the flange (6) is arranged at the bottom of the shaft, the flange (6) and the suction cup (1) are fixedly connected by a mounting member, the slip ring sleeve (11) is coaxially rotatably arranged on the outer wall of the shaft, and the annular channel is located between the shaft and the slip ring sleeve (11). Two bearings (13) are coaxially arranged in the annular channel, and sealing members (18) are arranged at the top end and the bottom end of the annular channel, and the top of the sealing member (18) at the upper end is provided with a retaining ring (19), and the bottom of the sealing member (18) at the lower end is also provided with the retaining ring (19), the sealing member (18) is used for sealing the annular channel, and the retaining ring (19) is used for limiting the bearing (13).

4. A low stress clamp according to claim 3, wherein, A third channel is formed in the center of the top of the suction cup (1), and a plurality of fourth channels are arranged in the suction cup (1) corresponding to a plurality of suction portions, one end of each of the fourth channels is in communication with a corresponding suction portion, and the other end of each of the fourth channels is in communication with the third channel, and the third channel and the fourth channels form the cavity.

5. A low stress clamp as claimed in claim 4, wherein, The first channel (8) is formed in the radial direction of the rotating shaft, and the second channel (9) is formed in the center of the bottom surface of the flange (6) in the axial direction of the rotating shaft, and the first channel (8) and the second channel (9) are in communication to form a communication channel. The first channel (8) is in communication with the annular channel, and one end of the second channel (9) away from the first channel (8) is in communication with the third channel.

6. A low stress clamp as claimed in claim 5, wherein, First locking holes are formed in the side walls of the first support (22) and the second support away from each other, the first locking holes are in communication with the through space, and first locking members (23) are arranged in the first locking holes, the first locking members (23) abut against the swing arm (20) to fix the pencil support on the swing arm (20).

7. A low stress clamp as claimed in claim 6, wherein, One of the first supports (22) has a through hole formed in the direction perpendicular to the axis of the swing arm (20), and the pencil (24) is arranged in the through hole, and the side wall of the first support (22) away from the second support opposite thereto has a second locking hole in communication with the through hole, and a second locking member (25) is arranged in the second locking hole, the second locking member (25) abuts against the pencil (24) to limit the pencil (24), and the yoke (26) is fixedly arranged at the bottom of the other first support (22).

8. A clamping method using a low stress fixture according to any one of claims 1-7, characterized in that, The clamping method comprises: S01, placing the part to be polished (3) on the polishing disc; S02, installing the slip ring mechanism on the suction cup (1) by using the mounting member; S03, placing the suction cup (1) on the top of the part to be polished (3); S04, connecting the vacuum tube (2) by the external air suction member to generate a negative pressure suction force on the suction portion to adsorb the part to be polished (3); S05, adjusting the positions of the two pencil supports, so that the connecting head (4) of the pencil (24) enters the groove (10), and the limiting portion of the yoke (26) limits the vacuum tube (2).

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