A special-shaped large MIM product drilling jig

Abstract

The application discloses a special-shaped large MIM product drilling tool jig, which solves the problems of large machining positioning deviation, low clamping efficiency and low yield rate; the tool jig comprises an integrally formed base, a product positioning assembly, a quick clamping assembly and a drill bit calibration assembly, and is sequentially arranged along the base to form an integrated structure; the product positioning assembly is provided with retractable positioning pins which are inserted into a preset circular hole of a product to realize accurate positioning; the quick clamping assembly is a sliding connection flat mouthed clamp which is locked through an inner hexagonal screw; the drill bit calibration assembly is provided with a centering rod which is used for calibrating a drill bit reference; and the base is provided with a supporting platform to ensure that the product is horizontal. The jig is designed through circular hole accurate positioning, quick clamping and one-time calibration, avoids the influence of sintering size fluctuation, improves the machining yield rate from 70% to 98%, improves the efficiency by 40%, cancels the whole inspection process, reduces the production cost, and is suitable for batch drilling of special-shaped large MIM products.

Description

Technical Field

[0001] This utility model relates to the field of MIM product processing technology, specifically to a tooling fixture for drilling irregularly shaped large MIM products. Background Technology

[0002] Metal injection molding (MIM) technology, as a highly efficient precision parts forming process, has been widely used in the mass production of complex-shaped parts. Among them, large-sized, irregularly shaped MIM products are prone to dimensional fluctuations (such as shrinkage deformation and shape deviation) after sintering, which brings many technical challenges to subsequent drilling processes. 1. Insufficient positioning accuracy: Traditional processing methods often use the product shape as the positioning reference. Due to the large fluctuation in the external dimensions of irregularly shaped large MIM products after sintering, the positioning deviation is significant, and the drilling position accuracy cannot meet the design requirements. The product yield is usually only about 70%. 2. Low clamping efficiency: Existing clamping tools (such as ordinary vises) require repeated adjustments to the clamping position, which is cumbersome when adapting to irregular structures. The clamping time for a single piece is long and cannot meet the needs of mass production. 3. Poor consistency in batch processing: The lack of a dedicated drill bit calibration benchmark means that the tool needs to be recalibrated before each processing, resulting in large dispersion of drilling dimensions in batch production. This requires an additional full inspection process, which further increases production costs. 4. Insufficient processing stability: Irregularly shaped large MIM products have irregular structures, and traditional clamping methods can easily lead to uneven distribution of clamping force. During drilling, the product is prone to displacement and tilting, which not only affects the processing accuracy but may also cause damage to the drill bit and scrap the product.

[0003] To address the aforementioned issues, there is currently no integrated tooling fixture specifically designed for drilling irregularly shaped and large MIM products. There is an urgent need for a dedicated tooling fixture that combines precise positioning, rapid clamping, and batch calibration functions to resolve the technical challenges in drilling irregularly shaped and large MIM products. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a tooling fixture for drilling irregularly shaped large MIM products. By optimizing the positioning method, clamping structure and calibration mechanism, it achieves the technical effects of accurate positioning, fast clamping and convenient calibration. It solves the problems of positioning deviation, low clamping efficiency and poor batch processing consistency caused by dimensional fluctuations after sintering of irregularly shaped large MIM products, thereby improving processing efficiency and product yield and reducing production costs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a tooling fixture for drilling irregularly shaped large MIM products, including an integrated base, a product positioning component, a quick clamping component and a drill bit calibration component. The product positioning component, the quick clamping component and the drill bit calibration component are arranged sequentially along the length direction of the base to adapt to the irregularly shaped large MIM products to be drilled after sintering. The product positioning component includes an axially retractable product positioning pin, which protrudes vertically from the upper surface of the base and is used to insert into a pre-set circular hole in the irregularly shaped large MIM product to achieve precise positioning. The quick clamping assembly includes a flat-mouth side-fixed frog clamp, which is slidably connected to the base and used to fit the end face of the product away from the positioning pin and lock it in place. The drill bit calibration assembly includes a centering rod, which is vertically fixed to the upper surface of the base and is used for reference calibration of the drill bit's machining position before drilling.

[0006] In a preferred embodiment, the extension stroke of the product positioning pin is 20mm, and the top of the positioning pin is provided with a conical guide head for guiding the product positioning pin to be accurately inserted into the product's circular hole.

[0007] In a preferred embodiment, the base has a T-shaped groove extending along its length, and the bottom of the flat-mouthed toad pliers is provided with a sliding seat that matches the T-shaped groove. The sliding seat and the T-shaped groove form a sliding fit, thereby realizing the reciprocating adjustment of the toad pliers along the base.

[0008] In a preferred embodiment, the sliding seat is threaded with an internal hexagon locking screw, the end of which abuts against the inner wall of the T-shaped groove, for locking and fixing the sliding seat and the frog pliers in the target position, thereby achieving tight clamping of the product end face.

[0009] In a preferred embodiment, the central axis of the centering rod is coplanar with the design central axis of the circular hole to be processed in the product, and the center distance between the centering rod and the product positioning pin is equal to the design center distance between the product positioning circular hole and the circular hole to be processed.

[0010] In a preferred embodiment, the upper surface of the base is provided with a raised product support platform, and the upper surface of the product support platform is flush with the insertion end face of the product positioning pin.

[0011] In a preferred embodiment, the product positioning pin is connected to the base via an elastic telescopic mechanism. The elastic telescopic mechanism includes a guide sleeve and a return spring. The guide sleeve is fixed inside the base, the product positioning pin slides through the guide sleeve, and the return spring is sleeved on the outside of the product positioning pin. Its two ends abut against the top of the guide sleeve and the shoulder of the positioning pin, respectively, to achieve elastic locking after the positioning pin is inserted.

[0012] In a preferred embodiment, the clamping surface of the flat-mouthed side-fixed frog clamp is provided with an anti-slip and wear-resistant rubber pad. The surface of the rubber pad is provided with diamond-shaped anti-slip patterns to increase the friction with the end face of the product and prevent the product from shifting during processing.

[0013] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows: 1. Significantly improved positioning accuracy: By using the product's preset circular hole as the positioning reference, combined with the retractable positioning pin, conical guide head and elastic locking mechanism, the influence of the dimensional fluctuation of irregularly shaped large MIM products after sintering is avoided, the positioning deviation is controlled within ±0.02mm, and the consistency of drilling position is greatly improved. 2. Significantly improved clamping efficiency: Through the cooperation of the T-shaped slide and the sliding seat, the position adjustment of the frog pliers can be quickly achieved. Combined with the quick locking function of the internal hexagon locking screw, the clamping time of a single product is shortened from 3-5 minutes in the traditional way to less than 30 seconds, and the processing efficiency is increased by more than 40%. 3. Good consistency in batch processing: The position parameters of the centering bar and the positioning pin are precisely matched with the product design dimensions. One calibration can meet the batch processing requirements. The batch processing size dispersion is ≤ ±0.01mm, and the product yield rate is increased from the traditional 70% to over 98%. 4. Strong structural stability: The integrated base provides stable support, the product support platform ensures that the product is placed horizontally, and the anti-slip and wear-resistant rubber pad increases the clamping friction. The "positioning-clamping-support" synergistic effect ensures that the product does not shift or tilt during processing, and the drilling quality is stable. 5. Wide adaptability and easy operation: The sliding adjustment function of the frog pliers and the telescopic design of the positioning pin can be adapted to large irregular MIM products of different lengths and thicknesses without changing the fixture; each component is easy to operate and clamping and calibration can be completed without professional skills. 6. Significantly reduced production costs: Improved yield reduces product scrap and rework costs, shorter clamping and calibration times reduce labor costs, and batch processing eliminates the need for full inspection, further saving on testing costs. Overall production costs are reduced by more than 30%. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Appendix Figure 1This is a schematic diagram of the tooling fixture for drilling irregularly shaped large MIM products according to this utility model. Appendix Figure 2 This is a schematic diagram of the machining of the tooling fixture for drilling large, irregularly shaped MIM products according to this utility model. Figure 1 ; Appendix Figure 3 This is a schematic diagram of the machining of the tooling fixture for drilling large, irregularly shaped MIM products according to this utility model. Figure 2 ;

[0016] The components include: 1. Base; 2. Product positioning component; 3. Quick clamping component; 4. Drill bit calibration component; 5. Product positioning pin; 6. Flat-mouth side fixing frog pliers; 7. Centering rod; 8. Anti-slip and wear-resistant rubber pad; a. Irregularly shaped large MIM products. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0020] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1 Appendix Figure 1 -As shown in Figure 3, a tooling fixture for drilling irregularly shaped large MIM products according to this utility model includes an integrated base 1, a product positioning component 2, a quick clamping component 3, and a drill bit calibration component 4. The product positioning component 2, the quick clamping component 3, and the drill bit calibration component 4 are arranged sequentially along the length of the base 1 to form an integrated "positioning-clamping-calibration" structure, which is specially adapted to irregularly shaped large MIM products 9 to be drilled after sintering and replaces traditional decentralized processing auxiliary tools.

[0024] Overall structural design: The base 1 is made of integrated molding process and is made of high-strength aluminum alloy or No. 45 steel. It has sufficient rigidity and stability, providing a uniform and flat mounting reference surface for subsequent components and avoiding the impact of deformation of the base 1 on the machining accuracy. The product positioning component 2, quick clamping component 3 and drill bit calibration component 4 are arranged linearly along the length of the base 1, respectively corresponding to the positioning end, clamping end and machining reference end of the irregular large MIM product 9, forming a collaborative overall structure.

[0025] Product positioning component 2 includes an axially retractable product positioning pin 5, which protrudes vertically from the upper surface of the base 1. Its core function is to insert into a pre-set circular hole (not a shape reference) of the irregularly shaped large MIM product 9 to achieve precise positioning, avoiding the impact of dimensional fluctuations after product sintering on positioning accuracy. The extension stroke of the product positioning pin 5 is 20mm, meeting the positioning requirements of products of different thicknesses. The top of the positioning pin is equipped with a conical guide head, which guides the positioning pin to quickly and accurately insert into the product's circular hole through the conical structure of the guide head, reducing the difficulty of clamping and alignment. Furthermore, the product positioning pin 5... The product positioning pin 5 is connected to the base 1 via an elastic telescopic mechanism. The elastic telescopic mechanism includes a guide sleeve and a return spring. The guide sleeve is fixed inside the base 1 by an interference fit. The product positioning pin 5 is slidably inserted inside the guide sleeve. The return spring is sleeved on the outside of the product positioning pin 5, with its two ends abutting against the top of the guide sleeve and the shoulder of the positioning pin, respectively. When the positioning pin is inserted into the round hole of the product, the elastic force of the return spring can make the positioning pin fit tightly against the inner wall of the round hole of the product, realizing elastic locking after positioning. At the same time, when picking up or putting down the product, the positioning pin can be manually pulled out. After the product is released, the return spring drives the positioning pin to automatically return to its original position, improving the convenience of operation.

[0026] Quick-clamping assembly 3 includes a flat-mouth side-fixed frog clamp 6, which is slidably connected to the base 1 to fit and lock the end face of the product away from the positioning pin. To allow for position adjustment of the frog clamp, the base 1 has a T-shaped groove extending along its length. The bottom of the flat-mouth side-fixed frog clamp 6 has a sliding seat that matches the T-shaped groove. The sliding seat and the T-shaped groove form a sliding fit, allowing the frog clamp to be reciprocated along the length of the base 1, adapting to large, irregularly shaped MIM products 9 of different lengths. A hexagonal socket head cap screw is threaded through the sliding seat. The end of the clamp abuts against the inner wall of the T-shaped slide. After the clamp moves to the target position (fitting the end face of the product), tighten the internal hex lock screw. The friction between the end of the screw and the inner wall of the slide locks the sliding seat and the clamp, thereby achieving tight clamping of the end face of the product and preventing product displacement during processing. In addition, the clamping surface of the clamp 6 fixed on the flat side is provided with an anti-slip and wear-resistant rubber pad 8. The surface of the rubber pad is provided with a diamond-shaped anti-slip pattern. The elastic deformation of the rubber pad increases the friction with the end face of the product, while avoiding hard contact that could scratch the product surface, further preventing product displacement during processing.

[0027] Drill bit calibration component 4 includes a centering rod 7, which is vertically fixed to the upper surface of the base 1 and used for benchmark calibration of the drill bit's machining position before drilling. To ensure calibration accuracy, the central axis of the centering rod 7 is coplanar with the design central axis of the circular hole to be machined on the product, and the center distance between the centering rod 7 and the product positioning pin 5 is equal to the design center distance between the product positioning circular hole and the circular hole to be machined. Before machining, only the drill bit needs to be aligned with the centering rod 7 to complete one calibration, which can determine the relative position of the drill bit and the circular hole to be machined. No repeated calibration is required during batch machining, which significantly improves machining consistency and efficiency.

[0028] Auxiliary support structure: The upper surface of the base 1 is provided with a raised product support platform. The upper surface of the product support platform is flush with the insertion end face of the product positioning pin 5. When the product is placed on the support platform, the product positioning surface and the insertion end of the positioning pin form a surface-pin cooperative positioning, ensuring that the product is in a horizontal state after placement, avoiding drilling angle deviation due to product tilting, and further improving positioning stability.

[0029] Example 2 like Figures 1-3 As shown in the figure, this embodiment discloses a tooling fixture for drilling irregularly shaped large MIM products, the specific structure of which is as follows:

[0030] 1. Selection of component materials and sizes Base 1: It is made of 45 steel in one piece forging, with a length of 500mm, a width of 150mm, and a thickness of 50mm, to ensure sufficient rigidity and stability; the product support platform on the upper surface of base 1 has a height of 10mm, and the flatness error of the upper surface is ≤0.01mm, which is flush with the insertion end face of the product positioning pin 5; the T-shaped slide has a groove width of 20mm and a groove depth of 15mm, and is opened through the length of base 1.

[0031] Product positioning component 2: Product positioning pin 5 is made of Cr12MoV alloy tool steel, with a diameter that matches the product positioning round hole (e.g., φ8mm), a length of 50mm, and a telescopic stroke of 20mm; the cone angle of the conical guide head is 30°, which facilitates insertion; the guide sleeve is made of 40Cr material, with an inner diameter that is clearance-fitted with the product positioning pin 5 (clearance 0.005-0.01mm), and is fixed in the mounting hole inside the base 1 by interference fit; the return spring is a cylindrical helical compression spring with a spring wire diameter of 2mm, a free length of 30mm, a compression stroke of 20mm, and an elastic coefficient of 5N / mm.

[0032] Quick clamping assembly 3: The flat-mouth side-fixed frog clamp 6 is an industrial-grade frog clamp of model HT-100 with a clamping stroke of 0-50mm; the sliding seat is made of aluminum alloy and is fitted with the T-shaped sliding groove with a clearance of 0.02-0.03mm; the internal hex lock screw is an M12 high-strength bolt with a length of 30mm; the anti-slip and wear-resistant rubber pad 8 is made of nitrile rubber with a thickness of 5mm and a diamond anti-slip texture with a depth of 1mm and an included angle of 60°.

[0033] Centering rod 7: Made of tungsten steel, with a diameter of φ10mm and a length of 80mm, it is vertically fixed to the upper surface of the base 1 by threaded connection. Its central axis is coplanar with the design central axis of the circular hole to be processed in the product, and the center distance between the centering rod 7 and the product positioning pin 5 is equal to the design center distance between the product positioning circular hole and the circular hole to be processed (e.g., 100mm).

[0034] 2. Component assembly method Product positioning component 2 assembly: First, press the guide sleeve into the preset mounting hole of the base 1 (interference 0.01-0.02mm), then put the return spring on the outside of the product positioning pin 5, and then insert the product positioning pin 5 from the top of the guide sleeve, so that the two ends of the return spring abut against the top of the guide sleeve and the shoulder of the positioning pin respectively, to complete the assembly of the elastic telescopic mechanism. The product positioning pin 5 protrudes vertically from the upper surface of the base 1 by 30mm (in the non-telescopic state).

[0035] Quick clamping assembly 3 assembly: Insert the sliding seat into one end of the T-shaped slide groove, and the sliding seat and the T-shaped slide groove form a sliding fit; fix the flat-mouth side-fixing frog pliers 6 to the upper surface of the sliding seat with 4 M8 bolts; screw the internal hexagon lock screw through the threaded hole (M12) on the side of the sliding seat, with the end pointing to the inner wall of the T-shaped slide groove. After tightening, the sliding seat can be locked and fixed.

[0036] Drill bit calibration component 4 assembly: A threaded hole (M10) is preset on the base 1. The distance between the center of the threaded hole and the center of the product positioning pin 5 is equal to the design center distance between the product positioning round hole and the round hole to be processed. The centering rod 7 is fixed in the threaded hole by threaded connection to ensure that the centering rod 7 is perpendicular to the upper surface of the base 1 (perpendicularity error ≤0.005mm).

[0037] 3. Steps for using tooling and fixtures Product placement: Manually pull out the product positioning pin 5 (compress the return spring) upwards so that the top of the positioning pin is lower than the upper surface of the product support platform. Place the sintered and formed irregularly shaped large MIM product 9 on the product support platform, and align the product positioning hole with the position of the product positioning pin 5.

[0038] Product positioning: When the product positioning pin 5 is released, under the elastic force of the return spring, the product positioning pin 5 automatically springs back and inserts into the product positioning hole. The conical guide head guides the positioning pin into precise position, achieving precise positioning of the product.

[0039] Quick clamping: Slide the flat side of the T-shaped slide groove to fix the frog clamp 6, so that the clamping surface of the frog clamp is in contact with the end face of the product away from the positioning pin. Then tighten the internal hex lock screw. The sliding seat and frog clamp are locked by the friction between the screw end and the inner wall of the T-shaped slide groove. The anti-slip and wear-resistant rubber pad 8 is in close contact with the end face of the product to achieve a firm clamping of the product.

[0040] Drill bit calibration: Start the milling machine, move the tungsten carbide drill bit to the centering bar 7 position, align the centering bar 7 with the centering function of the milling machine, complete the benchmark calibration of the drill bit machining position, and determine the relative position of the drill bit and the circular hole to be machined.

[0041] Drilling: Move the drill bit to the designed position of the round hole to be drilled on the product, start the drilling operation, and after the drilling is completed, loosen the Allen lock screw, slide the frog pliers away from the product, pull out the product positioning pin 5, take out the processed product, and you can proceed to process the next product.

[0042] 4. Scope of application and effectiveness verification The tooling fixture of this embodiment is suitable for drilling irregularly shaped large MIM products 9 with lengths of 50-300mm and thicknesses of 10-50mm, and is especially suitable for products with dimensional fluctuations within ±0.5mm after sintering. Actual verification shows that when using this tooling fixture, the drilling position error is ≤±0.02mm, the single-piece clamping + calibration time is ≤30 seconds, the processing efficiency is increased by 45%, and the product yield is consistently above 98.5%. Compared with traditional processing methods, the overall production cost is reduced by 35%, fully meeting the batch drilling needs of irregularly shaped large MIM products 9.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0044] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tooling fixture for drilling irregularly shaped large MIM products, characterized in that, It includes an integrated base, a product positioning component, a quick clamping component, and a drill bit calibration component. The product positioning component, the quick clamping component, and the drill bit calibration component are arranged sequentially along the length of the base to accommodate large, irregularly shaped MIM products to be drilled after sintering. The product positioning component includes an axially retractable product positioning pin, which protrudes vertically from the upper surface of the base and is used to insert into a pre-set circular hole in the irregularly shaped large MIM product to achieve precise positioning. The quick clamping assembly includes a flat-mouth side-fixed frog clamp, which is slidably connected to the base and used to fit the end face of the product away from the positioning pin and lock it in place. The drill bit calibration assembly includes a centering rod, which is vertically fixed to the upper surface of the base and is used for reference calibration of the drill bit's machining position before drilling.

2. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The product positioning pin has a telescopic stroke of 20mm, and the top of the positioning pin is provided with a conical guide head for guiding the product positioning pin to be accurately inserted into the product's round hole.

3. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The base has a T-shaped groove extending along its length. The bottom of the flat-mouthed toad pliers is provided with a sliding seat that matches the T-shaped groove. The sliding seat and the T-shaped groove form a sliding fit, enabling the toad pliers to be adjusted back and forth along the base.

4. The tooling fixture for drilling irregularly shaped large MIM products according to claim 3, characterized in that, The sliding seat is threaded with an internal hexagon locking screw. The end of the internal hexagon locking screw abuts against the inner wall of the T-shaped slide groove, which is used to lock and fix the sliding seat and the frog pliers in the target position to achieve tight clamping of the product end face.

5. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The center axis of the centering rod is coplanar with the design center axis of the circular hole to be processed in the product, and the center distance between the centering rod and the product positioning pin is equal to the design center distance between the product positioning circular hole and the circular hole to be processed.

6. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The upper surface of the base is provided with a raised product support platform, and the upper surface of the product support platform is flush with the insertion end face of the product positioning pin.

7. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The product positioning pin is connected to the base through an elastic telescopic mechanism. The elastic telescopic mechanism includes a guide sleeve and a return spring. The guide sleeve is fixed inside the base, and the product positioning pin slides through the guide sleeve. The return spring is sleeved on the outside of the product positioning pin, with its two ends abutting against the top of the guide sleeve and the shoulder of the positioning pin, respectively, to achieve elastic locking after the positioning pin is inserted.

8. The tooling fixture for drilling irregularly shaped large MIM products according to claim 1, characterized in that, The clamping surface of the flat-mouth side-fixed frog clamp is provided with an anti-slip and wear-resistant rubber pad. The surface of the rubber pad is provided with diamond-shaped anti-slip patterns to increase the friction with the end face of the product and prevent the product from shifting during processing.

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