A positioning and clamping fixture for precision machining of carbon ceramic brake discs

Abstract

This utility model relates to the field of carbon ceramic brake disc fixtures and tooling technology, specifically to a positioning and clamping fixture for precision machining of carbon ceramic brake discs, comprising: a base; a positioning component, which includes a positioning block and a positioning boss, the surface of which is provided with a strip-shaped positioning groove, a positioning key protruding from the center of the positioning block, the positioning key being inserted into the positioning groove, and positioning pins provided at both ends of the positioning block; and a fixing component, which includes a fixing plate and a clamping bolt, the clamping bolt providing downward pressure to the fixing plate. Through the above configuration, the product fixing efficiency and precision machining quality are effectively improved, enabling precision machining operations on different models of carbon ceramic brake discs, effectively improving applicability, reducing manufacturing costs, and avoiding the problem of localized micro-cracks or deformation in carbon ceramic brake discs.

Description

Technical Field

[0001] This utility model relates to a positioning and clamping fixture for precision machining of carbon ceramic brake discs, belonging to the technical field of carbon ceramic brake disc fixtures. Background Technology

[0002] Carbon-ceramic composite materials have become a key material for manufacturing high-performance brake discs due to their excellent properties such as high specific strength, high temperature resistance, and wear resistance. With the widespread application of this material in aerospace and high-end civilian fields, extremely stringent requirements have been placed on its precision machining and quality.

[0003] Currently, when precision machining the end face countersunk holes and outer circumference, a three-jaw chuck is commonly used to clamp and fix the brake disc to be machined. However, in actual use, many defects have been found:

[0004] First, three-jaw chucks are difficult to position, requiring repeated adjustments during positioning, resulting in low efficiency. Furthermore, a single positioning point can easily cause micro-displacement of the product during clamping, leading to poor repeatability and difficulty in meeting the consistency requirements of multiple batches of products. Second, when precision machining thin and small carbon-ceramic brake discs, the high hardness and brittleness of the carbon-ceramic material cause the brake disc to be processed to be suspended in the air due to the gaps between the three-jaw chucks. This lack of effective support easily leads to product deformation, dimensional deviations, and poor machining accuracy, severely hindering the improvement of product yield. Finally, existing tooling is usually designed specifically for particular product models, lacking necessary versatility and adaptability. Facing the trend of multi-variety, small-batch production, manufacturers need to equip themselves with a large number of specialized toolings, resulting in excessively high production costs. Therefore, researching a new positioning and clamping tooling for the precision machining of carbon-ceramic brake discs is of great practical significance. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a positioning and clamping fixture for the precision machining of carbon ceramic brake discs.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a positioning and clamping fixture for precision machining of carbon ceramic brake discs, comprising: a base for placing the carbon ceramic brake disc to be processed, wherein a radially penetrating T-shaped fixing groove is provided at the bottom of the base;

[0007] The positioning component includes a positioning block and a positioning boss fixed and protruding from the upper surface of the base. The positioning boss has a circular cross-sectional shape and a strip-shaped positioning groove is provided on its surface. Multiple fixing holes are arranged in a ring array around the positioning groove. A positioning key is protruding from the center of the positioning block. The positioning key is inserted into the positioning groove. Positioning pins are provided at both ends of the positioning block. When the positioning key is inserted into the positioning groove, the positioning pins are facing the upper surface of the base other than the positioning boss.

[0008] The fixing assembly includes a fixing plate and a clamping bolt that is screwed into the fixing hole, the clamping bolt providing downward pressure to the fixing plate.

[0009] Furthermore, the outer diameter of the base is not less than the outer diameter of the carbon ceramic brake disc to be processed. When the carbon ceramic brake disc to be processed is placed on the base, the upper surface of the base abuts and fits against the lower surface of the carbon ceramic brake disc to be processed.

[0010] Furthermore, the front end of the fixing plate has a U-shaped opening structure, and the clamping bolt is located inside the U-shaped opening. When the fixing plate clamps and fixes the carbon ceramic brake disc to be processed, the front opening area at least partially abuts against the brake disc.

[0011] Furthermore, the axial protrusion height of the positioning boss is less than the thickness of the carbon ceramic brake disc to be processed, and the tail end of the fixing plate is provided with a protrusion that abuts against the positioning boss.

[0012] Furthermore, the positioning boss is a stepped structure composed of multiple concentric positioning steps with different outer diameters, and each positioning step is equipped with an adjustment pad ring with the same thickness and the same outer diameter as the base.

[0013] Furthermore, the positioning groove is provided with three fixing holes arranged in a ring around its perimeter. The vertical distance K1 between the center of the fixing hole and the outer circumference of the top positioning step is 0.1-0.2 times the diameter of the top positioning step.

[0014] Furthermore, the longitudinal centerline and the transverse centerline of the positioning groove intersect at the center of the positioning boss, and the minimum distance K2 between the positioning groove and the centers of the three fixing holes is 0.9-1.1 times the vertical distance K1 between the center of the fixing holes and the outer circumference of the top positioning step.

[0015] Furthermore, the length extension direction of the positioning groove is perpendicular to the length extension direction of the T-shaped fixing groove.

[0016] Furthermore, the positioning block has strip-shaped holes at both ends, and the positioning pin is located in the strip-shaped holes. It is fixed in a predetermined position in the strip-shaped holes by screwing a nut located on the lower surface of the positioning block.

[0017] Furthermore, the base, the positioning boss, the positioning block, and the fixing plate are all made of aluminum alloy or stainless steel.

[0018] The beneficial effects of this utility model are as follows: Firstly, the above-mentioned design allows for convenient and quick limitation of the radial and circumferential positions of the brake disc to be processed, effectively improving product fixing efficiency and finishing quality. Secondly, this application enables the finishing operation of different models of carbon-ceramic brake discs, achieving the goal of using one set of tooling for multiple models, effectively improving applicability and reducing manufacturing costs. Thirdly, after fixing the brake disc to be processed, the lower end face of the brake disc fits against the upper surface of the base, making it suitable for the finishing operation of thinner and smaller carbon-ceramic brake discs. This effectively avoids cutting stress during clamping or processing, preventing local stress concentration that could lead to localized damage to the carbon-ceramic brake disc. This invention addresses the issue of micro-cracks or deformation in thin, small carbon-ceramic brake discs when using traditional three-jaw chucks for precision machining. The gaps between the three jaws leave the disc suspended without support, leading to product deformation and compromised machining accuracy. This design further improves applicability and ensures higher precision machining quality and yield. Finally, with these features, after machining, the brake disc can be easily removed by loosening the fixing screws and rotating the fixing plate. The disc can then be replaced with the one to be machined, and machining can continue after fixing. This convenient operation effectively ensures repeatability and improves machining efficiency and precision machining quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the positioning and clamping fixture for fixing the carbon ceramic brake disc to be processed, provided in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the base and positioning boss structure provided in Embodiment 1 of this utility model;

[0021] Figure 3 This is a schematic diagram of the base and positioning boss provided in Embodiment 1 of this utility model from another perspective.

[0022] Figure 4 This is a schematic diagram of the positioning block structure provided in Embodiment 1 of this utility model;

[0023] Figure 5 This is a side view of the fixed pressure plate structure provided in Embodiment 1 of this utility model.

[0024] Reference numerals in the attached diagram: 0. Carbon ceramic brake disc to be processed; 1. Base; 2. T-shaped fixing groove; 3. Positioning block; 4. Positioning boss; 5. Positioning groove; 6. Fixing hole; 7. Positioning key; 8. Positioning pin; 9. Fixing pressure plate; 10. Clamping bolt; 11. Strip hole; 12. Threaded hole; 13. Protrusion. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Example 1

[0030] like Figure 1-4 As shown, this utility model provides a positioning and clamping fixture for precision machining of carbon ceramic brake discs, including: a base 1, which is used to place the carbon ceramic brake disc to be machined; a radially penetrating T-shaped fixing groove 2 is provided at the bottom of the base 1, which is installed on the machine tool worktable and is fixed to the T-shaped groove of the CNC machine tool worktable through the T-shaped fixing groove 2; a threaded hole 12 is provided on the base 1 corresponding to the position of the T-shaped fixing groove 2, which is connected to the T-shaped fixing groove 2; the position of the base 1 is locked by the countersunk bolt in the threaded hole 12.

[0031] The positioning component includes a positioning block 3 and a positioning boss 4 fixed and protruding from the upper surface of the base 1. The positioning boss 4 has a circular cross-section and a strip-shaped positioning groove 5 on its surface. Multiple fixing holes 6 are arranged in a ring around the positioning groove 5. A positioning key 7 protrudes from the center of the positioning block 3. The positioning key 7 is inserted into the positioning groove 5. Positioning pins 8 are provided at both ends of the positioning block 3. When the positioning key 7 is inserted into the positioning groove 5, the positioning pins 8 are facing the upper surface of the base 1 other than the positioning boss 4.

[0032] The fixing assembly includes a fixing plate 9 and a clamping bolt 10 that is screwed into the fixing hole 6, the clamping bolt 10 providing downward pressure to the fixing plate 9.

[0033] It should be noted that the outer diameter of the positioning boss 4 is adapted to the inner diameter of the carbon ceramic brake disc to be processed, so as to locate the center of the brake disc. The positioning component is used to locate the position of the countersunk hole to be processed on the brake disc to ensure that it meets the position requirements of CNC programming and avoids processing errors. The fixing component is used to press and fix the brake disc to be processed after positioning. The positioning boss 4 and the base 1 are integral structures formed by processing. The positioning key 7 and the positioning block 3 are integral structures formed by processing. The positioning groove 5 has three fixing holes 6 arranged in a ring array around its periphery. The ring array means that the centers of multiple fixing holes 6 are on the same circumference and the fixing holes 6 are spaced 60 degrees apart. The size of the positioning pin 8 can be freely selected according to the size of the countersunk hole of the brake disc to be processed.

[0034] Before performing the finishing work, first, the base 1 is fixed to the T-slot of the CNC machine tool worktable. Then, the first brake disc to be processed is mounted on the positioning boss 4. Then, the center distance between the positioning pins 8 at both ends of the positioning block 3 is measured. By adjusting the position of the positioning pins 8, the center distance between the two positioning pins 8 is the same as the center distance of the countersunk hole of the brake disc to be processed. Then, the position of the positioning pins 8 is tightened. At this time, the positioning block 3 has been adjusted to ensure that the positioning block 3 is compatible with the brake disc to be processed. Then, the positioning key 7 is inserted into the positioning groove 5. At the same time, the brake disc is rotated so that the positioning pins 8 at both ends enter the countersunk hole on the brake disc. At this time, the radial and circumferential positions of the brake disc to be processed are defined. Then, the fixing plate 9 is rotated so that it partially presses on the brake disc. Then, the clamping bolt 10 is tightened so that the fixing plate 9 presses the brake disc. Then, the positioning block 3 is removed, and the finishing of the countersunk hole and outer circumferential surface of the brake disc to be processed can begin.

[0035] This application, through the above-mentioned settings, can conveniently and quickly define the radial and circumferential positions of the brake disc to be processed, effectively improving product fixing efficiency and finishing quality. Secondly, this application can realize the finishing operation of different models of carbon ceramic brake discs, achieving the purpose of using one set of tooling for multiple models, effectively improving applicability and reducing production and manufacturing costs. Thirdly, after fixing the brake disc to be processed, the lower end face of the brake disc fits against the upper surface of the base 1, which is suitable for the finishing operation of thinner and smaller carbon ceramic brake discs. This can effectively avoid cutting stress during clamping or processing, which can cause local stress concentration and lead to local micro-cracks in the carbon ceramic brake disc. This invention addresses the issue of deformation caused by traditional three-jaw chucks. When machining thin, small carbon-ceramic brake discs, the gaps between the three jaws leave the disc suspended without support, leading to product deformation and compromised machining accuracy. This design further improves applicability and ensures higher machining quality and yield. Finally, with these features, after machining, the brake disc can be removed simply by loosening the fixing screws and rotating the fixing plate 9. The disc can then be replaced with the one to be machined, and machining can continue after fixing. This convenient operation effectively ensures repeatability and improves machining efficiency and finish quality.

[0036] Specifically, the outer diameter of the base 1 is not less than the outer diameter of the carbon-ceramic brake disc to be processed. When the carbon-ceramic brake disc to be processed is placed on the base 1, the upper surface of the base 1 abuts against the lower surface of the carbon-ceramic brake disc to be processed. Through this setting, the base 1 provides the brake disc to be processed with the maximum contact area, forming full-surface support and significantly reducing the pressure per unit area. Its synergy with the three-point clamping force of the fixing component evenly distributes the stress generated during processing along the entire support surface, effectively avoiding the stress concentration phenomenon caused by local suspension in traditional clamping. When performing precision machining on the outer circumference, it can better support the brake disc to be processed, effectively avoiding the problem of micro-displacement or vibration of the product due to cutting force at the support edge, which could lead to micro-cracks or overall warping deformation on the outer circumference of the product, further ensuring processing accuracy and processing quality.

[0037] Specifically, such as Figure 1As shown, the front end of the fixed pressure plate 9 has a U-shaped opening structure, and the clamping bolt 10 is located inside the U-shaped opening. When the fixed pressure plate 9 clamps and fixes the carbon ceramic brake disc to be processed, the front opening area at least partially abuts against the brake disc. First, when the fixed pressure plate 9 needs to be replaced, there is no need to remove the clamping bolt 10; simply loosening it allows the fixed pressure plate 9 to be pulled away, effectively improving maintenance efficiency. Second, the clamping bolt 10 is located inside the U-shaped opening, and the concentrated force it applies is redistributed through the elastic deformation of the fixed pressure plate 9 body. This results in a more uniform contact pressure distribution between the front end of the fixed pressure plate 9 and the contact area with the product to be processed, significantly reducing the risk of product surface crushing or micro-cracks caused by excessive local compressive stress. Furthermore, the clamping bolt 10 serves as a fulcrum, and by moving the fixed pressure plate 9 back and forth according to different models of brake discs to be processed, the downward pressure of the fixed pressure plate 9 on the brake disc to be processed can be adjusted. This allows the application to ensure the fixing effect while avoiding product surface crushing or micro-cracks when applied to multiple product models, effectively improving the applicability.

[0038] Specifically, such as Figure 5 As shown, the axial protrusion height of the positioning boss 4 is less than the thickness of the carbon-ceramic brake disc to be processed, and the tail end of the fixing plate 9 is provided with a protrusion 13 that abuts against the positioning boss 4. By setting the protrusion height of the positioning boss 4 to be less than the thickness of the carbon-ceramic brake disc to be processed, the probability of tool collision damage caused by misoperation during processing can be effectively reduced. Furthermore, while ensuring radial positioning, it can also effectively reduce weight and tooling manufacturing costs. Secondly, by setting the protrusion 13, the problem of local crushing or edge chipping of the inner ring of the brake disc caused by the front end of the fixing plate 9 contacting the upper surface of the brake disc when there is a height difference between the positioning boss 4 and the brake disc can be avoided. Moreover, during processing, the cutting force will generate an overturning moment that causes the brake disc to lift or rotate. Through the rigid abutment between the protrusion 13 and the positioning boss 4, an upward reaction force can be provided immediately to counteract the overturning moment, effectively improving processing stability.

[0039] Specifically, such as Figure 2-3 As shown, the positioning boss 4 is a stepped structure composed of multiple concentric positioning steps with different outer diameters. Each positioning step is equipped with an adjusting shim ring of the same thickness and with an outer diameter identical to that of the base 1. It should be noted that the adjusting shim rings are not shown in the attached drawings. Multiple adjusting shim rings are pre-set according to the number of positioning steps, and the material of the adjusting shim rings is the same as that of the base 1. This design allows for the processing of various models of brake discs with different inner diameters. Furthermore, by setting the adjusting shim rings, the lower surface of the brake disc can be well supported, further improving applicability while effectively preventing micro-cracks caused by partial suspension of the brake disc.

[0040] Specifically, such as Figure 2 As shown, the positioning groove 5 has three fixing holes 6 arranged in a ring around its perimeter. The vertical distance K1 between the center of the fixing hole 6 and the outer circumference of the top positioning step is 0.1-0.2 times the diameter of the top positioning step. This arrangement forms a stable triangular stiffness distribution structure, ensuring that the stress is evenly distributed inside the base 1. While maintaining a safe distance from the edge of the brake disc, it ensures that the clamping force can be effectively transmitted to the outer edge area of ​​the brake disc, effectively preventing excessive local stress in the base 1 and the positioning boss 4, which could lead to cracks and damage in the area between the positioning boss 4 and the fixing holes 6, excessive pressure on the edge of the brake disc to be processed causing chipping defects, and vibration or deformation of the outer edge of the brake disc. If the vertical distance K1 between the center of the fixing hole 6 and the outer circumference of the top positioning step is less than 0.1 times the diameter of the top positioning step, the fixing hole 6 is too close to the edge of the positioning boss 4, which could lead to... The stress concentration at the edge of the positioning boss 4 increases significantly, which can easily lead to microcrack propagation and damage under long-term cyclic loading. At the same time, the point of application of the clamping force is too far outward, which will generate excessive torque and cause excessive pressure on the edge of the brake disc to be processed. This can easily cause chipping defects in brittle carbon ceramic materials. When K1 is greater than 0.2 times the diameter of the top positioning step, the fixing hole 6 is too close to the center, and the lever arm of the clamping force is significantly shortened. To achieve the same clamping effect, the clamping force needs to be greatly increased. This not only increases the structural strength requirements of the fixing hole 6 and the positioning boss 4, but also results in the clamping force distribution being insufficient to effectively constrain the outer edge area of ​​the brake disc. When machining the countersunk hole, the outer edge is prone to vibration and deformation.

[0041] Specifically, such as Figure 2 As shown, the longitudinal centerline X1 and the transverse centerline X2 of the positioning groove 5 intersect at the center of the positioning boss 4. The minimum distance K2 between the positioning groove 5 and the centers of the three fixing holes 6 is 0.9-1.1 times the vertical distance K1 between the center of the fixing hole 6 and the outer circumference of the top positioning step. Through the above settings, the surrounding area of ​​the positioning groove 5 and the surrounding area of ​​the fixing hole 6 form a structure with approximately equal stiffness. When machining the countersunk hole, the periodic cutting force generated by the drill bit can be uniformly and quickly transmitted to the base 1, ensuring that the vibration energy is uniformly dissipated inside the base 1 and avoiding the occurrence of local resonance. It can also avoid the interaction between the three fixing holes 6, so that the torque generated by the cutting force can be uniformly transmitted to the base 1 through the three fixing points, preventing stress concentration caused by stress transmission conflicts. If the minimum distance K2 between the positioning groove 5 and the center of the three fixing holes 6 is less than 0.9 times the vertical distance K1 between the center of the fixing hole 6 and the outer circumference of the top positioning step, the size of the positioning groove 5 is too large and its distance from the fixing hole 6 is too close, which will cause a high stress concentration area inside the base 1. After the pre-tightening force of the clamping bolt 10 is superimposed, it will significantly increase the risk of cracking of the base 1 and weaken the structural strength of the side wall of the positioning groove 5.

[0042] Specifically, to reduce the difficulty of drill bit positioning, the length extension direction of the positioning groove 5 is perpendicular to the length extension direction of the T-shaped fixing groove 2.

[0043] Specifically, the positioning block 3 has strip-shaped holes 11 at both ends, and the positioning pin 8 is located in the strip-shaped holes 11. It is fixed in a predetermined position in the strip-shaped holes 11 by screwing a nut located on the lower surface of the positioning block 3. This setting enables the tooling described in this application to be applicable to more specifications and models of brake discs, further improving its applicability.

[0044] Specifically, the base 1, the positioning boss 4, the positioning block 3, and the fixing plate 9 are all made of aluminum alloy or stainless steel. By selecting lighter and more corrosion-resistant aluminum alloy or stainless steel, the surface can be dried with an air gun after each use. The accuracy remains almost unchanged with long-term use, and the materials are more corrosion-resistant, durable, and effectively ensure service life.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these modifications and improvements are all within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims.

Claims

1. A positioning and clamping tool for finishing of carbon ceramic brake disc, characterized in that, include: A base for placing the carbon ceramic brake disc to be processed, wherein a radially penetrating T-shaped fixing groove is provided at the bottom of the base; The positioning component includes a positioning block and a positioning boss fixed and protruding from the upper surface of the base. The positioning boss has a circular cross-sectional shape and a strip-shaped positioning groove is provided on its surface. Multiple fixing holes are arranged in a ring array around the positioning groove. A positioning key is protruding from the center of the positioning block. The positioning key is inserted into the positioning groove. Positioning pins are provided at both ends of the positioning block. When the positioning key is inserted into the positioning groove, the positioning pins are facing the upper surface of the base other than the positioning boss. The fixing assembly includes a fixing plate and a clamping bolt that is screwed into the fixing hole, the clamping bolt providing downward pressure to the fixing plate.

2. The positioning and clamping tool according to claim 1, characterized in that The outer diameter of the base is not less than the outer diameter of the carbon ceramic brake disc to be processed. When the carbon ceramic brake disc to be processed is placed on the base, the upper surface of the base abuts and fits against the lower surface of the carbon ceramic brake disc to be processed.

3. The positioning and clamping tool according to any of claims 1-2, characterized in that The front end of the fixed pressure plate has a U-shaped opening structure, and the clamping bolt is located inside the U-shaped opening. When the fixed pressure plate clamps and fixes the carbon ceramic brake disc to be processed, the front opening area at least partially abuts against the brake disc.

4. The positioning and clamping tool according to claim 3, characterized in that The axial protrusion height of the positioning boss is less than the thickness of the carbon ceramic brake disc to be processed, and the tail end of the fixing plate is provided with a protrusion that abuts against the positioning boss.

5. The positioning and clamping fixture of claim 4, wherein The positioning boss is a stepped structure composed of multiple concentric positioning steps with different outer diameters. Each positioning step is equipped with a height adjustment pad ring with the same thickness and the same outer diameter as the base.

6. The positioning and clamping fixture according to claim 5, characterized in that, The positioning groove is surrounded by three fixing holes arranged in a ring. The vertical distance K1 between the center of the fixing hole and the outer circumference of the top positioning step is 0.1-0.2 times the diameter of the top positioning step.

7. The positioning and clamping fixture according to claim 6, characterized in that, The longitudinal centerline and the transverse centerline of the positioning groove intersect at the center of the positioning boss. The minimum distance K2 between the positioning groove and the center of the three fixing holes is 0.9-1.1 times the vertical distance K1 between the center of the fixing holes and the outer circumference of the top positioning step.

8. The positioning and clamping fixture according to claim 7, characterized in that, The length extension direction of the positioning groove is perpendicular to the length extension direction of the T-shaped fixing groove.

9. The positioning and clamping fixture according to claim 8, characterized in that, The positioning block has slotted holes at both ends, and the positioning pin is located in the slotted hole. It is fixed in a predetermined position in the slotted hole by screwing a nut located on the lower surface of the positioning block.

10. The positioning and clamping fixture according to claim 9, characterized in that, The base, the positioning boss, the positioning block, and the fixing plate are all made of aluminum alloy or stainless steel.

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