A quick-change polishing fixture

Abstract

This invention relates to the field of polishing equipment technology, and more particularly to a quick-change polishing fixture, comprising: a base, the base including a base portion and a positioning boss protruding upward from the center of the top of the base portion; wherein, a keyway is provided at each of the four corners of the top surface of the base portion; an adhesive strip, the adhesive strip having a U-shaped structure matching the contour of the base and being fitted around the outer periphery of the positioning boss; the top surface of the adhesive strip being higher than the top surface of the positioning boss, so as to jointly form a placement groove for accommodating a workpiece; the bottom surface of the adhesive strip having multiple weight-reducing grooves extending along its U-shaped path; multiple rigid blocks, the number of which corresponds to the keyway, each rigid block being embedded in the weight-reducing groove at each of the four corners of the bottom surface of the adhesive strip; wherein, the bottom of each rigid block is integrally formed with a downwardly extending positioning key, the positioning key being adapted to and embedded in the keyway, so as to position and connect the rigid block to the base and press and fix the adhesive strip to the base portion.

Description

Technical Field

[0001] This invention relates to the field of polishing equipment technology, and in particular to a quick-change polishing fixture. Background Technology

[0002] In existing technologies, polishing is a key process for improving the surface quality of workpieces, and polishing fixtures are core auxiliary components that ensure polishing accuracy and efficiency. Currently, when polishing workpieces of different models or sizes, it is usually necessary to customize a dedicated integrated polishing fixture for each workpiece. The base of this type of fixture and the rubber strip used for positioning and buffering are an inseparable integrated structure, resulting in low changeover efficiency and high operating costs. When changing polishing products, the entire fixture must be disassembled and replaced from the polishing machine, which is cumbersome and time-consuming, severely restricting the changeover efficiency and capacity improvement of the production line. Furthermore, the manufacturing cost of integrated fixtures is high, and the rubber strip is a consumable part; if it fails due to long-term friction and wear or aging, the entire fixture must be scrapped, as it is impossible to replace the consumable part separately, leading to persistently high operating costs.

[0003] In addition, traditional integrated fixtures suffer from unstable positioning accuracy and lack of self-tightening compensation. During long-term polishing operations, the rubber strip is prone to softening and deformation due to frictional heat, directly affecting the workpiece positioning accuracy. Furthermore, the accumulation of heat further accelerates the wear of the rubber strip, shortening its service life. Existing structures lack effective heat dissipation design and cannot achieve self-tightening compensation under temperature rise conditions. Thermal deformation can easily lead to a decrease in workpiece polishing accuracy and fixture loosening, affecting the stability of polishing quality. Therefore, developing a polishing fixture that can be quickly replaced, has low manufacturing and operating costs, good heat dissipation, and can maintain stable clamping force at operating temperatures has become an urgent technical problem to be solved in this field. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes a quick-change polishing fixture.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A quick-change polishing fixture, comprising: The base includes a base portion and a positioning boss that protrudes upward from the center of the top of the base portion; The base portion has a keyway at each of the four corners of its top surface; The adhesive strip is a U-shaped structure that matches the outline of the base and is fitted onto the outer periphery of the positioning boss; The top surface of the adhesive strip is higher than the top surface of the positioning boss, so that they together form a placement groove for accommodating the workpiece. The bottom surface of the adhesive strip is provided with multiple weight-reducing grooves extending along its zigzag path; Multiple rigid blocks, the number of which corresponds to the keyway, are respectively embedded in the weight-reducing grooves at the four corners of the bottom surface of the rubber strip; Each of the rigid blocks has a downwardly extending positioning key integrally formed at its bottom. The positioning key is adapted to and embedded in the keyway to position and connect the rigid block to the base and press and fix the adhesive strip to the base portion.

[0006] Furthermore, the top surface of the base is provided with a plurality of positioning posts, and the bottom surface of the adhesive strip is provided with positioning holes that correspond one-to-one with the plurality of positioning posts.

[0007] Furthermore, the plurality of positioning posts are evenly arranged around the periphery of the positioning boss.

[0008] Furthermore, the positioning key includes a plurality of parallel and spaced reinforcing ribs, and the keyway is provided with slots that fit into each of the reinforcing ribs.

[0009] Furthermore, the rigid block is made of metal; when the positioning key is embedded in the keyway, the bottom surface of the rigid block contacts the bottom plane of the keyway.

[0010] Furthermore, the locating boss has an annular wedge groove on its root periphery; at least one metal wedge block is pre-embedded in the lower inner part of the adhesive strip, and the outer surface of the metal wedge block has a pressing inclined surface that matches the groove surface of the annular wedge groove; the thermal expansion coefficient of the metal wedge block is greater than that of the locating boss; wherein, when the working temperature rises, the metal wedge block expands due to heat, driving the pressing inclined surface to slide along the groove surface of the annular wedge groove, so as to generate a radial pressing force and an axial pressing force acting on the adhesive strip simultaneously.

[0011] Furthermore, the cross-section of the annular wedge groove is a right triangle, with one right-angled side formed by the top surface of the base portion, the other right-angled side formed by the side surface of the positioning boss, and the hypotenuse forming the groove surface.

[0012] Furthermore, the clamping inclined surface is flush with the inner side of the adhesive strip, and in the normal temperature assembly state, a preset thermal expansion gap is formed between the clamping inclined surface and the groove surface of the annular wedge groove.

[0013] Furthermore, there are multiple metal wedges, which are segmented and evenly distributed along the circumference of the adhesive strip.

[0014] Furthermore, the inner side of the top surface of the adhesive strip is provided with an inwardly extending limiting part; the limiting part is used to fit and limit the damping cloth laid on the top surface of the positioning boss, so as to form a buffer layer in the placement groove to prevent the workpiece from being scratched.

[0015] Compared with the prior art, the beneficial effects of the present invention are: Compared with existing technologies, the quick-change polishing fixture of this invention has comprehensive advantages. It enables rapid assembly and disassembly of the rubber strip and the base, significantly improving changeover efficiency and production line capacity. The separate structure allows for individual replacement of vulnerable parts, greatly reducing manufacturing, usage, and maintenance costs. Multiple positioning structures effectively limit rubber strip displacement, and a self-tightening compensation design under temperature rise conditions prevents thermal softening and deformation of the rubber strip, ensuring stable and reliable positioning accuracy. The weight-reduced design of the rubber strip and the heat conduction of the metal components improve overall heat dissipation performance, extending the service life of vulnerable parts. Furthermore, it is adaptable to workpieces of different models, sizes, and surface precision requirements, with a wide range of applications. The connection structure of each component is simple and reliable, facilitating processing, assembly, and maintenance, thus comprehensively solving many shortcomings of existing integral polishing fixtures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the quick-change polishing fixture proposed in this invention; Figure 2 This is an exploded view of the quick-change polishing fixture proposed in this invention. Figure 3 This is a schematic diagram of the structure of the rubber strip in the quick-change polishing fixture proposed in this invention; Figure 4 For the present invention Figure 2 A magnified structural diagram of point A in the middle.

[0017] In the figure: 1-base, 11-base part, 12-positioning boss, 13-positioning post, 14-slot, 15-wedge groove, 2-adhesive strip, 21-weight reduction groove, 22-positioning hole, 23-limiting part, 3-rigid block, 31-reinforcing rib, 4-wedge block. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-4 As shown, this embodiment provides a quick-change polishing fixture, including: The base 1 includes a base portion 11 and a positioning boss 12 that protrudes upward from the center of the top of the base portion 11; The base portion 11 has a keyway at each of its four corners on its top surface; Adhesive strip 2, wherein the adhesive strip 2 is a U-shaped structure that matches the outline of the base 1 and is fitted around the outer periphery of the positioning boss 12; The top surface of the adhesive strip 2 is higher than the top surface of the positioning boss 12, so that they together form a placement groove for accommodating the workpiece. The bottom surface of the adhesive strip 2 is provided with multiple weight-reducing grooves 21 extending along its zigzag path; Multiple rigid blocks 3, the number of which corresponds to the keyway, are respectively embedded in the weight reduction grooves 21 at the four corners of the bottom surface of the adhesive strip 2; Each of the rigid blocks 3 has a downwardly extending positioning key integrally formed at its bottom. The positioning key is adapted to and embedded in the keyway to position and connect the rigid block 3 to the base 1 and press and fix the adhesive strip 2 to the base part 11.

[0020] Overall, it includes a base 1, a rubber strip 2, and multiple rigid blocks 3 (corresponding to the number of keyways at the four corners of the top surface of the base part 11); the base 1 is made of aluminum alloy, which combines lightweight and structural strength. It includes a horizontally arranged base part 11 and a positioning boss 12. The positioning boss 12 protrudes upward from the center of the top of the base part 11 to form a support structure for positioning the bottom of the workpiece; a rectangular keyway is opened at each of the four corners of the top surface of the base part 11 to ensure the stability of the positioning connection.

[0021] The rubber strip 2 is made of wear-resistant and highly elastic polyurethane material. Its structure is a U-shape that matches the contour of the base 1. The inner circle size of the rubber strip 2 is matched with the outer circumference size of the positioning boss 12 to ensure that the rubber strip 2 can be smoothly fitted onto the outer circumference of the positioning boss 12. The top surface of the rubber strip 2 is higher than the top surface of the positioning boss 12. Together, they form a placement groove for accommodating the workpiece. The size of the placement groove can be designed according to the specifications of the target workpiece to achieve circumferential and bottom positioning of the workpiece. The bottom surface of the rubber strip 2 is evenly provided with multiple weight-reducing grooves 21 along its U-shaped path. The cross-section of the weight-reducing grooves 21 is trapezoidal, which not only reduces the weight of the rubber strip 2, but also increases the heat dissipation area of ​​the rubber strip 2, alleviating heat accumulation during the polishing process.

[0022] The rigid block 3 is made of 45 steel, which has sufficient rigidity and wear resistance. Multiple rigid blocks 3 are respectively embedded in the weight reduction grooves 21 at the four corners of the bottom surface of the rubber strip 2. The size of the weight reduction groove 21 is interference-fitted with the size of the rigid block 3 to ensure that the rigid block 3 and the rubber strip 2 are tightly connected. The bottom of each rigid block 3 is integrally formed with a downward extending positioning key. The cross-sectional shape of the positioning key is adapted to the keyway of the base part 11 (all are rectangular). The length of the positioning key is consistent with the depth of the keyway. When the positioning key is embedded in the keyway, the bottom surface of the rigid block 3 contacts the bottom plane of the keyway. The surface contact further improves the connection stability and presses the rubber strip 2 tightly and fixes it to the top surface of the base part 11 to prevent the rubber strip 2 from shifting during the polishing process.

[0023] Assembly process: First, fit the rubber strip 2 around the positioning boss 12 of the base 1, so that the bottom surface of the rubber strip 2 is in contact with the top surface of the base part 11; then, embed multiple rigid blocks 3 into the weight-reducing grooves 21 at the four corners of the bottom surface of the rubber strip 2, ensuring that the rigid blocks 3 are tightly fitted with the weight-reducing grooves 21; finally, align the positioning key at the bottom of the rigid block 3 with the keyway of the base part 11 and insert it to complete the fixing of the rubber strip 2 and the base 1; when replacing the rubber strip 2, simply remove the rigid block 3 upwards to remove the rubber strip 2 from the outer periphery of the positioning boss 12, replace the new rubber strip 2 and repeat the above assembly steps.

[0024] By enabling quick assembly and disassembly of the adhesive strip 2 and the base 1, the replacement process is convenient and efficient; the adhesive strip 2 can be replaced individually, significantly reducing the cost of use; the design of the weight-reducing groove 21 improves the heat dissipation performance of the adhesive strip 2 and extends its service life; the surface contact connection between the rigid block 3 and the keyway ensures positioning accuracy and ensures stable workpiece polishing quality.

[0025] like Figures 2-3 As shown, in this embodiment, the top surface of the base portion 11 is provided with a plurality of positioning posts 13, and the bottom surface of the adhesive strip 2 is provided with positioning holes 22 that correspond one-to-one with the plurality of positioning posts 13.

[0026] Specifically, the structure of adding positioning posts 13 and positioning holes 22 is improved as follows: multiple positioning posts 13 are provided on the top surface of the base part 11. The positioning posts 13 are made of aluminum alloy and are integrally formed with the base part 11. The bottom surface of the rubber strip 2 is provided with positioning holes 22 that correspond to the multiple positioning posts 13. The depth of the positioning holes 22 is the same as the height of the positioning posts 13. The positioning posts 13 and the positioning holes 22 are fitted with a clearance to ensure that the two can be smoothly inserted.

[0027] The assembly process of this embodiment adds a step to the above embodiment: when fitting the adhesive strip 2, the positioning hole 22 on the bottom surface of the adhesive strip 2 is aligned with the positioning post 13 on the top surface of the base part 11 and inserted to achieve the pre-positioning of the adhesive strip 2, and then the rigid block 3 is installed and the positioning key is connected.

[0028] By pre-positioning the positioning pin 13 and the positioning hole 22, the rubber strip 2 and the base 1 can be quickly aligned and installed, further improving assembly and changeover efficiency. At the same time, the cooperation between the positioning pin 13 and the positioning hole 22 can restrict the rotation and displacement of the rubber strip 2 in the horizontal direction, and form a double positioning with the positioning key of the rigid block 3, which improves the stability of the rubber strip 2 and further ensures the positioning accuracy of the workpiece.

[0029] like Figures 2-3 As shown, in this embodiment, the plurality of positioning posts 13 are evenly arranged around the periphery of the positioning boss 12.

[0030] Specifically, the arrangement of the positioning posts 13 is optimized: multiple positioning posts 13 are evenly arranged around the periphery of the positioning boss 12, and the included angle between two adjacent positioning posts 13 is equal, which can correspond to the middle position of each side of the adhesive strip 2 respectively.

[0031] The uniform arrangement of the positioning posts 13 can ensure that the pre-positioning force of each part of the rubber strip 2 is uniform, avoiding deformation of the rubber strip 2 due to uneven local force. At the same time, the uniformly distributed positioning posts 13 can further improve the circumferential positioning accuracy of the rubber strip 2 and prevent circumferential displacement of the rubber strip 2 during polishing, which is especially suitable for polishing positioning of round or ring-shaped workpieces.

[0032] like Figure 2 and Figure 4 As shown, in this embodiment, the positioning key includes a plurality of parallel and spaced reinforcing ribs 31, and the keyway is provided with slots 14 that fit into each of the reinforcing ribs 31.

[0033] Specifically, the structure of the positioning key is optimized: the positioning key includes multiple parallel and spaced reinforcing ribs 31, which are integrally formed with the positioning key and made of 45 steel; the keyway is provided with slots 14 that fit into each reinforcing rib 31, and the number and size of the slots 14 correspond one-to-one with the reinforcing ribs 31 to enhance the structural strength of the positioning key.

[0034] The fitting of the reinforcing rib 31 with the slot 14 increases the contact area between the positioning key and the keyway, improving the connection's robustness. At the same time, the reinforcing rib 31 enhances the positioning key's resistance to shearing, preventing deformation or breakage of the positioning key due to long-term disassembly or polishing vibrations, and extending the service life of the rigid block 3. Furthermore, the fit between the reinforcing rib 31 and the slot 14 further restricts the rotation of the positioning key within the keyway, improving positioning accuracy.

[0035] like Figure 2 and Figure 4 As shown, in this embodiment, the rigid block 3 is made of metal; when the positioning key is embedded in the keyway, the bottom surface of the rigid block 3 contacts the bottom plane of the keyway.

[0036] Specifically, the material and contact method of the rigid block 3 are specified: the rigid block 3 is made of metal material (preferably 45 steel or stainless steel). The rigidity and wear resistance of metal material are far superior to those of non-metal material, which can effectively avoid wear caused by long-term use of the rigid block 3; when the positioning key is embedded in the keyway, the bottom surface of the rigid block 3 is in complete planar contact with the bottom of the keyway.

[0037] The wear resistance of the metal rigid block 3 is improved, extending its service life; the full-area planar contact between the rigid block 3 and the keyway allows for uniform pressure distribution, avoiding deformation of the base 1 or the rigid block 3 caused by local stress concentration; at the same time, the surface contact can improve heat conduction efficiency, transferring the heat generated by the rubber strip 2 to the base 1 through the rigid block 3, further improving the heat dissipation effect and alleviating the problem of thermal softening of the rubber strip 2.

[0038] like Figures 2-4 As shown, in this embodiment, the circumferential side of the root of the positioning boss 12 is provided with an annular wedge groove 15; at least one metal wedge block 4 is pre-embedded in the lower inner part of the adhesive strip 2, and the outer surface of the metal wedge block 4 has a pressing inclined surface that matches the groove surface of the annular wedge groove 15; the thermal expansion coefficient of the metal wedge block 4 is greater than that of the positioning boss 12; wherein, when the working temperature rises, the metal wedge block 4 expands due to heat, driving the pressing inclined surface to slide along the groove surface of the annular wedge groove 15, so as to generate a radial pressing force and an axial pressing force acting on the adhesive strip 2 simultaneously.

[0039] Specifically, an annular wedge groove 15 and a metal wedge block 4 are added to solve the self-tightening compensation problem under temperature rise conditions. The specific improvements are as follows: an annular wedge groove 15 is provided on the circumference of the root of the positioning boss 12, and the annular wedge groove 15 extends continuously along the circumference of the positioning boss 12; at least one metal wedge block 4 is pre-embedded in the lower inner part of the rubber strip 2. The metal wedge block 4 is made of copper alloy material, and its thermal expansion coefficient is greater than that of the positioning boss 12, ensuring that the metal wedge block 4 expands more when heated; the outer surface of the metal wedge block 4 has a pressing slope that matches the groove surface of the annular wedge groove 15.

[0040] The working principle of this embodiment is as follows: During the polishing process, the rubber strip 2 generates heat due to friction, causing the working temperature to rise. The metal wedge block 4 expands due to the heat. Since its coefficient of thermal expansion is greater than that of the positioning boss 12, the expansion amount of the metal wedge block 4 is greater than that of the positioning boss 12. This drives the pressing inclined surface to slide along the groove surface of the annular wedge groove 15. This sliding generates two component forces: a radial pressing force pointing towards the outside of the rubber strip 2 in the radial direction, and an axial pressing force pointing towards the base part 11 in the axial direction. The two component forces work together on the rubber strip 2 to achieve radial and axial self-tightening of the rubber strip 2.

[0041] By setting up a thermal expansion clamping structure, the problems of softening and deformation of the rubber strip 2 and loosening of the fixture under the temperature rise of traditional fixtures are solved. The thermal expansion of the metal wedge block 4 realizes the self-tightening compensation of the rubber strip 2, ensuring that the clamping force of the rubber strip 2 on the workpiece is stable throughout the polishing process. At the same time, the radial clamping force can further limit the radial deformation of the rubber strip 2, and the axial clamping force can enhance the tightness of the fit between the rubber strip 2 and the base part 11, improving the positioning accuracy. In addition, the metal wedge block 4 can enhance the structural strength of the inner side of the rubber strip 2 and reduce the wear of the rubber strip 2.

[0042] like Figure 2 and Figure 4 As shown, in this embodiment, the cross-section of the annular wedge groove 15 is a right triangle, with one right-angled side formed by the top surface of the base portion 11, the other right-angled side formed by the side surface of the positioning boss 12, and the hypotenuse forming the groove surface.

[0043] Specifically, the cross-sectional structure of the annular wedge groove 15 is optimized: the cross-section of the annular wedge groove 15 is a right-angled triangle, with one right-angled side formed by the top surface of the base portion 11 and the other right-angled side formed by the side surface of the positioning boss 12, and its hypotenuse forming a groove surface that matches the clamping slope of the metal wedge block 4. This acute angle allows for a reasonable ratio of radial to axial clamping force generated when the metal wedge block 4 expands, ensuring clamping stability while preventing excessive pressure from causing deformation of the rubber strip 2.

[0044] The annular wedge groove 15 with a right-angled triangular cross section is easy to process and can be formed in one step by milling. The inclined groove surface fits tightly with the pressing inclined surface of the metal wedge block 4, ensuring the efficiency of force transmission during thermal expansion and avoiding uneven force distribution. The reasonable acute angle makes the self-tightening force controllable, adaptable to workpieces of different hardness, and prevents excessive pressure from damaging the workpiece or the rubber strip 2.

[0045] like Figures 2-4 As shown, in this embodiment, the pressing inclined surface is flush with the inner side of the adhesive strip 2, and in the normal temperature assembly state, a preset thermal expansion gap is formed between the pressing inclined surface and the groove surface of the annular wedge groove 15.

[0046] Specifically, a thermal expansion gap is added: the pressing slope of the metal wedge block 4 is flush with the inner side of the rubber strip 2 to ensure that the rubber strip 2 is not interfered with by the metal wedge block 4 when it is fitted onto the positioning boss 12; in the normal temperature assembly state, a preset thermal expansion gap is formed between the pressing slope and the groove surface of the annular wedge groove 15.

[0047] The thermal expansion gap setting can avoid the pre-pressure generated between the clamping inclined surface and the annular wedge groove 15 during assembly at room temperature, ensuring that the rubber strip 2 can be smoothly installed and removed without affecting the quick-change function; at the same time, the gap size can be calculated and determined according to the thermal expansion coefficient and working temperature range of the metal wedge block 4, ensuring that the metal wedge block 4 can completely fill the gap and generate sufficient self-tightening force after expansion at the working temperature, realizing the compatibility of self-tightening compensation and quick-change function.

[0048] like Figure 3 As shown, in this embodiment, there are multiple metal wedge blocks 4, which are segmented and evenly distributed along the circumference of the adhesive strip 2.

[0049] Specifically, the structure of the metal wedge block 4 is optimized: there are multiple metal wedge blocks 4, and the multiple metal wedge blocks 4 are segmented structures, evenly distributed along the circumference of the rubber strip 2, and the spacing between two adjacent metal wedge blocks 4 is equal to ensure that the self-tightening force of each part is uniform.

[0050] The segmented metal wedge block 4 can make the thermal expansion self-tightening force of the rubber strip 2 evenly distributed in all circumferential directions, avoiding local deformation of the rubber strip 2 caused by uneven expansion of the integral wedge block 4; at the same time, the segmented structure facilitates the processing of the rubber strip 2 and the pre-embedding of the metal wedge block 4, reducing production difficulty; in addition, a single metal wedge block 4 can be replaced individually when damaged, further reducing maintenance costs.

[0051] like Figures 1-2 As shown, in this embodiment, the inner side of the top surface of the adhesive strip 2 is provided with an inwardly extending limiting part 23; the limiting part 23 is used to fit and limit the damping cloth laid on the top surface of the positioning boss 12, so as to form a buffer layer in the placement groove to prevent the workpiece from being scratched.

[0052] Specifically, a limiting part 23 and a damping cloth are added: the inner side of the top surface of the rubber strip 2 is provided with an inwardly extending limiting part 23, which is integrally formed with the rubber strip 2 to form a step for placing the damping cloth; the damping cloth is made of soft and wear-resistant wool felt material and is laid on the top surface of the positioning boss 12. The limiting part 23 fits and limits the damping cloth to prevent the damping cloth from shifting during polishing and forms a buffer layer in the placement groove to prevent the workpiece from being scratched.

[0053] The damping cloth can prevent the workpiece from directly and rigidly contacting the positioning boss 12 and the rubber strip 2, effectively preventing the workpiece surface from being scratched and improving the workpiece surface quality; the limiting part 23 ensures the stable positioning of the damping cloth and avoids the buffer failure caused by the displacement of the damping cloth during the polishing process; the damping cloth can be replaced separately, further reducing the cost of use and adapting to workpieces with different surface precision requirements.

[0054] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention; therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the invention; no reference numerals in the claims should be regarded as limiting the claims involved.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A quick-change polishing fixture, characterized in that, include: The base (1) includes a base portion (11) and a positioning boss (12) that protrudes upward from the center of the top of the base portion (11). Among them, a keyway is provided at each of the four corners of the top surface of the base part (11); Adhesive strip (2), the adhesive strip (2) is a U-shaped structure that matches the outline of the base (1) and is fitted around the outer periphery of the positioning boss (12); The top surface of the adhesive strip (2) is higher than the top surface of the positioning boss (12) so that they together form a placement groove for accommodating the workpiece. The bottom surface of the adhesive strip (2) is provided with multiple weight-reducing grooves (21) extending along its zigzag path. Multiple rigid blocks (3), the number of which corresponds to the keyway, and each of the rigid blocks (3) is respectively embedded in the weight reduction grooves (21) at the four corners of the bottom surface of the rubber strip (2); The bottom of each rigid block (3) is integrally formed with a downwardly extending positioning key, which is adapted to and embedded in the keyway to position and connect the rigid block (3) to the base (1) and press and fix the adhesive strip (2) to the base part (11).

2. The quick-change polishing fixture according to claim 1, characterized in that, The base part (11) is provided with a plurality of positioning posts (13) on its top surface, and the bottom surface of the rubber strip (2) is provided with positioning holes (22) that correspond to the plurality of positioning posts (13) in a one-to-one manner.

3. The quick-change polishing fixture according to claim 2, characterized in that, The plurality of positioning posts (13) are evenly arranged around the periphery of the positioning boss (12).

4. The quick-change polishing fixture according to claim 1, characterized in that, The positioning key includes a plurality of parallel and spaced reinforcing ribs (31), and the keyway is provided with a slot (14) that fits into each of the reinforcing ribs (31).

5. The quick-change polishing fixture according to claim 1, characterized in that, The rigid block (3) is made of metal material; when the positioning key is embedded in the keyway, the bottom surface of the rigid block (3) contacts the bottom plane of the keyway.

6. The quick-change polishing fixture according to claim 1, characterized in that, The locating boss (12) has an annular wedge groove (15) around its root; at least one metal wedge block (4) is embedded in the lower inner side of the rubber strip (2), and the outer surface of the metal wedge block (4) has a pressing slope that matches the groove surface of the annular wedge groove (15); the thermal expansion coefficient of the metal wedge block (4) is greater than that of the locating boss (12); when the working temperature rises, the metal wedge block (4) expands due to heat, driving the pressing slope to slide along the groove surface of the annular wedge groove (15) to generate a radial pressing force and an axial pressing force acting on the rubber strip (2) simultaneously.

7. The quick-change polishing fixture according to claim 6, characterized in that, The cross-section of the annular wedge groove (15) is a right triangle, with one right-angled side formed by the top surface of the base part (11) and the other right-angled side formed by the side surface of the positioning boss (12), and the hypotenuse forming the groove surface.

8. The quick-change polishing fixture according to claim 6, characterized in that, The pressing inclined surface is flush with the inner side of the rubber strip (2), and in the normal temperature assembly state, a preset thermal expansion gap is formed between the pressing inclined surface and the groove surface of the annular wedge groove (15).

9. The quick-change polishing fixture according to claim 6, characterized in that, The number of metal wedges (4) is multiple, and the multiple metal wedges (4) are segmented structures and are evenly distributed along the circumference of the adhesive strip (2).

10. The quick-change polishing fixture according to claim 1, characterized in that, The inner side of the top surface of the adhesive strip (2) is provided with an inwardly extending limiting part (23); the limiting part (23) is used to fit and limit the damping cloth laid on the top surface of the positioning boss (12) so as to form a buffer layer in the placement groove to prevent the workpiece from being scratched.

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