A detection jig for MIM rotating shaft machining

Abstract

The utility model relates to the technical field of pivot detection, and specifically discloses a detection fixture for MIM pivot machining, which comprises a base, a machining table installed on the base, a pivot body installed on the machining table through positioning structure, and an extrusion structure installed on the base for extruding the pivot body; and a detection block is further arranged on the base, a detection cylinder is slidably connected inside the detection block, and a detection groove adapted to the pivot body is formed on the detection cylinder, and the pivot body is detected by sliding the detection cylinder inside the detection block. The pivot body is fixed on the machining table by the positioning structure and the extrusion structure, and then the detection cylinder is driven to slide horizontally on the detection block. If the detection cylinder can slide horizontally to a predetermined position, it indicates that the shaft body of the pivot body is in a straight state, i. e. the product is qualified, otherwise the product is unqualified.

Description

Technical Field

[0001] This utility model relates to the field of shaft inspection technology, specifically a testing fixture for MIM shaft processing. Background Technology

[0002] MIM (Metal Injection Molding) is an advanced process that involves mixing metal powder with a binder and then injecting the mixture into a mold to form the final shape. This technology combines the characteristics of powder metallurgy and plastic injection molding, enabling the one-time production of complex and intricately structured metal parts. It is widely used in the production of precision components such as hinges in electronic products. As a key component connecting the screen to the body or enabling relative rotation between parts, the hinge in electronic devices withstands both bending and torque moments during operation. Its dimensional accuracy and geometric tolerances directly affect the opening and closing feel, structural stability, and service life of the product.

[0003] As a core functional component connecting the device screen to the body or enabling relative rotation between different parts, the performance of the hinge in electronic devices is crucial. During operation, the hinge simultaneously bears combined bending and torque loads. Its dimensional accuracy (especially the straightness and coaxiality of the shaft) and geometric tolerances directly determine the smoothness of opening and closing, the stability and reliability of the structure, and its long-term fatigue life. Therefore, in the manufacturing of MIM hinges, it is necessary to quickly and accurately inspect key geometric features such as the straightness of the shaft.

[0004] However, existing inspection methods typically employ mechanical equipment. While high-precision coordinate measuring machines (CMMs) or dedicated laser scanners offer high accuracy, they are generally expensive to purchase and require a complex set of loading and unloading equipment to meet automated inspection needs, further increasing the required space and presenting certain drawbacks. Utility Model Content

[0005] The purpose of this invention is to provide a testing fixture for machining MIM shafts, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a testing fixture for MIM shaft machining, comprising a base and a machining table mounted on the base, wherein a shaft body is mounted on the machining table via a positioning structure, and a pressing structure for pressing the shaft body is mounted on the base; and a testing block is also provided on the base, wherein a testing cylinder is slidably connected inside the testing block, and a testing groove adapted to the shaft body is provided on the testing cylinder, and the shaft body is tested by the testing cylinder sliding inside the testing block.

[0007] Furthermore, the rotating shaft body includes a connecting surface and a shaft body, wherein the connecting surface and the shaft body are integrally formed.

[0008] Furthermore, the positioning structure includes multiple positioning blocks, which are mounted on the processing table to form a positioning space, and the connecting surface on the rotating shaft body is mounted in the positioning space.

[0009] Furthermore, the positioning structure also includes at least two positioning rods, each of which is fixedly connected to a positioning post, and a positioning groove adapted to the positioning post is provided on the connecting surface of the rotating shaft body. When the rotating shaft body is installed on the processing table, the positioning post is engaged in the positioning groove.

[0010] Furthermore, the extrusion structure includes an extrusion rod that is vertically slidably connected to the positioning frame, and a self-locking pressure rod is rotatably connected to the positioning frame. The extrusion rod and the self-locking pressure rod are connected by a hinged connecting rod.

[0011] Furthermore, a limiting element is provided between the detection cylinder and the detection block.

[0012] Furthermore, the limiting component includes a limiting rod fixedly connected to the detection block, and the detection cylinder has a limiting groove adapted to the limiting rod, with the limiting rod and the limiting groove being slidably connected.

[0013] Furthermore, a rubber pad is provided on the bottom of the extrusion rod.

[0014] Furthermore, a first limiting block is provided on the processing table.

[0015] Furthermore, a second limiting block is also provided on the processing table.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: This inspection fixture for MIM shaft processing, through the cooperation of the base, processing table, positioning structure, extrusion structure, inspection block, and inspection cylinder, fixes the shaft body on the processing table using the positioning structure and extrusion structure during use. Then, the inspection cylinder is driven to slide horizontally on the inspection block. If the inspection cylinder can slide horizontally to a predetermined position, it indicates that the shaft body is straight, which is a qualified product; otherwise, it is a defective product. The above operation process is simple and convenient, and the overall cost of the fixture is reduced. It effectively avoids the dependence on complex loading and unloading systems and large spaces required by traditional high-cost automated inspection equipment, making it more practical. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model; Figure 2 This is a schematic diagram of the overall structure from another perspective, provided for an embodiment of the present utility model. Figure 3 This is a schematic diagram of the mounting position structure of the rotating shaft body provided in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the sliding mechanism of the detection cylinder provided in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the hidden state structure of the rotating shaft body provided in an embodiment of the present utility model; Figure 6 A schematic diagram of the extrusion structure provided in the embodiment of this utility model; Figure 7 A schematic diagram showing the state of the rotating shaft body installed on the positioning structure according to an embodiment of this utility model; Figure 8 This is a partial schematic diagram of the positioning structure provided in an embodiment of the present utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Base; 2. Processing table; 3. Positioning frame; 4. Rotary shaft body; 41. Connecting surface; 42. Shaft body; 5. Detection block; 6. Detection cylinder; 7. Detection groove; 8. Extrusion structure; 81. Extrusion rod; 82. Hinge connecting rod; 83. Self-locking pressure rod; 84. Rubber pad; 9. Positioning structure; 91. Positioning block; 92. Positioning rod; 93. Positioning column; 10. First limiting block; 11. Second limiting block; 12. Limiting rod; 13. Limiting groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-8This utility model provides a technical solution: a testing fixture for machining MIM shafts, including a base 1 and a processing table 2 mounted on the base 1. A shaft body 4 is mounted on the processing table 2 via a positioning structure 9, and a pressing structure 8 for pressing the shaft body 4 is mounted on the base 1. A testing block 5 is also provided on the base 1, and a testing cylinder 6 is slidably connected inside the testing block 5. The testing cylinder 6 has a testing groove 7 adapted to the shaft body 4. The shaft body 4 is tested by the testing cylinder 6 sliding inside the testing block 5.

[0022] Specifically, the inspection fixture for MIM shaft processing includes a base 1 and a processing table 2 mounted on the base 1. The bottom of the base 1 can be fitted with an anti-slip pad to improve the stability of the inspection fixture during use, resulting in better performance. The shaft body 4 is mounted on the processing table 2 via a positioning structure 9, and a pressing structure 8 for pressing the shaft body 4 is mounted on the base 1. The cooperation of the positioning structure 9 and the pressing structure 8 positions the shaft body 4, improving its stability during inspection. A detection block 5 is also provided on the base 1, with a detection cylinder 6 slidably connected inside. The detection cylinder 6 has a detection groove 7 adapted to the shaft body 4. The shaft body 4 is inspected by sliding the detection cylinder 6 inside the detection block 5. Since the detection cylinder 6 is in a straight position, it is driven to slide horizontally on the detection block 5. If the detection cylinder 6 can slide horizontally to a predetermined position, it indicates that the shaft 42 of the shaft body 4 is in a straight position, which is a qualified product; otherwise, it is a defective product. This process eliminates the need for expensive coordinate measuring machines or laser scanners, reducing equipment costs and site requirements. At the same time, the sliding detection cylinder 6 improves the convenience and efficiency of the inspection.

[0023] In the embodiments provided by this utility model, the rotating shaft body 4 includes a connecting surface 41 and a shaft body 42, with the connecting surface 41 and the shaft body 42 integrally formed. Specifically, the integrally formed structure of the rotating shaft body 4 ensures the integrity and strength of the rotating shaft body 4, avoiding errors and loosening caused by assembly.

[0024] In the embodiments provided by this utility model, the positioning structure 9 includes a plurality of positioning blocks 91, which are installed on the processing table 2 to form a positioning space. The connecting surface 41 on the rotating shaft body 4 is installed in the positioning space. Preferably, there are three positioning blocks 91, which are respectively set at different positions on the processing table 2 to prevent the rotating shaft body 4 from shifting or shaking during the detection process.

[0025] In the embodiments provided by this utility model, the positioning structure 9 further includes at least two positioning rods 92, each of which is fixedly connected to a positioning post 93. A positioning groove adapted to the positioning post 93 is provided on the connecting surface 41 of the rotating shaft body 4. When the rotating shaft body 4 is installed on the processing table 2, the positioning post 93 is engaged in the positioning groove. Preferably, the positioning groove is pre-opened on the rotating shaft body 4 to meet later requirements, therefore the installation position of the positioning rod 92 is adapted to the starting position of the positioning groove.

[0026] In the embodiments provided by this utility model, the extrusion structure 8 includes an extrusion rod 81 vertically slidably connected to the positioning frame 3, and a self-locking pressure rod 83 is rotatably connected to the positioning frame 3. The extrusion rod 81 and the self-locking pressure rod 83 are connected by a hinged connecting rod 82. Specifically, the extrusion structure 8 is a self-locking pressure rod 83 structure using the lever principle, which can achieve stable pressing of the rotating shaft with a small operating force. One end of the hinged connecting rod 82 is hinged to the extrusion rod 81, and the other end is hinged to the self-locking pressure rod 83.

[0027] In the embodiments provided by this utility model, a limiting component is provided between the detection cylinder 6 and the detection block 5. The limiting component includes a limiting rod 12 fixedly connected to the detection block 5, and a limiting groove 13 adapted to the limiting rod 12 is provided on the detection cylinder 6. The limiting rod 12 and the limiting groove 13 are slidably connected. Specifically, the setting of the limiting component ensures that the detection cylinder 6 slides smoothly in a predetermined direction, avoids detection errors caused by shaking or offset, and ensures the stability of the detection cylinder 6 when sliding on the detection block 5.

[0028] In the embodiments provided by this utility model, a rubber pad 84 is provided on the bottom of the extrusion rod 81. The rubber pad 84 can prevent the extrusion rod 81 from directly contacting the rotating shaft body 4, thus protecting the appearance quality of the rotating shaft body 4.

[0029] In the embodiments provided by this utility model, a first limiting block 10 is provided on the processing table 2, and a second limiting block 11 is also provided on the processing table 2. The second limiting block 11 and the first limiting block 10 together form a more complete positioning constraint, which better limits the rotating shaft body 4, reduces the adjustment time required for the rotating shaft body 4 during the installation process, and improves the clamping efficiency.

[0030] Working Principle: During use, the rotating shaft body 4 is first placed within the positioning structure 9 of the processing table 2. The positioning space formed by the positioning block 91 initially limits the connection surface 41 of the rotating shaft body 4. Precise positioning is then achieved by the positioning post 93 on the positioning rod 92 engaging with the positioning groove on the rotating shaft connection surface 41. Subsequently, the extrusion structure 8 is operated, pressing down the self-locking pressure rod 83. This, through the hinged connecting rod 82, drives the extrusion rod 81 downwards, using the rubber pad 84 at its bottom to press against the connection surface 41 of the rotating shaft body 4, ensuring stability during the inspection process. After fixing, the inspection cylinder 6 is pushed to slide smoothly along the guide rod 12 and the guide groove 13 within the inspection block 5. The inspection groove 7 at the front end of the inspection cylinder 6 will fit into the shaft body 42 of the rotating shaft body 4. If the shaft body 42 is straight and without bending or deformation, the inspection cylinder 6 can smoothly slide horizontally to the set position, indicating that the rotating shaft is qualified. If the shaft body 42 is bent, the inspection cylinder 6 will be obstructed during sliding and will not reach the set position, thus quickly determining that the rotating shaft is unqualified.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing fixture for machining MIM shafts, comprising a base (1) and a machining table (2) mounted on the base (1), characterized in that: The processing table (2) is equipped with a rotating shaft body (4) via a positioning structure (9), and the base (1) is equipped with a pressing structure (8) for pressing the rotating shaft body (4). Furthermore, a detection block (5) is provided on the base (1), and a detection cylinder (6) is slidably connected inside the detection block (5), and a detection groove (7) adapted to the rotating shaft body (4) is provided on the detection cylinder (6). The rotating shaft body (4) is tested by sliding the test cylinder (6) inside the test block (5).

2. The inspection fixture for machining MIM shafts according to claim 1, characterized in that: The rotating shaft body (4) includes a connecting surface (41) and a shaft body (42), and the connecting surface (41) and the shaft body (42) are integrally formed.

3. The inspection fixture for machining MIM shafts according to claim 2, characterized in that: The positioning structure (9) includes multiple positioning blocks (91), which are installed on the processing table (2) and form a positioning space. The connecting surface (41) on the rotating shaft body (4) is installed in the positioning space.

4. The inspection fixture for machining MIM shafts according to claim 3, characterized in that: The positioning structure (9) also includes at least two positioning rods (92), each positioning rod (92) is fixedly connected to a positioning post (93), and the connecting surface (41) of the rotating shaft body (4) is provided with a positioning groove that is compatible with the positioning post (93); When the shaft body (4) is installed on the machining table (2), the positioning pin (93) is engaged in the positioning groove.

5. The inspection fixture for machining MIM shafts according to claim 2, characterized in that: The extrusion structure (8) includes an extrusion rod (81) that is vertically slidably connected to the positioning frame (3), and a self-locking pressure rod (83) is rotatably connected to the positioning frame (3). The extrusion rod (81) and the self-locking pressure rod (83) are connected by a hinged connecting rod (82).

6. The inspection fixture for machining MIM shafts according to claim 1, characterized in that: A limiting element is provided between the detection cylinder (6) and the detection block (5).

7. The inspection fixture for machining MIM shafts according to claim 6, characterized in that: The limiting component includes a limiting rod (12) fixedly connected to the detection block (5), and a limiting groove (13) adapted to the limiting rod (12) is provided on the detection cylinder (6). The limiting rod (12) and the limiting groove (13) are slidably connected.

8. The inspection fixture for machining MIM shafts according to claim 5, characterized in that: A rubber pad (84) is provided on the bottom of the extrusion rod (81).

9. A testing fixture for machining MIM shafts according to claim 1, characterized in that: The processing table (2) is provided with a first limiting block (10).

10. A testing fixture for machining MIM shafts according to claim 1, characterized in that: The processing table (2) is also provided with a second limiting block (11).

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