Spring shot blasting intensity detection tool

Abstract

The utility model discloses a spring shot blasting strength detection frock, including the disc of upper and lower end, the support plate is connected fixed through the column of annular arrangement between two discs, and the support plate central inboard is fixed with the backing plate, and the backing plate is installed with the A type test piece for detecting spring shot blasting strength, and the utility model discloses the same frock of setting up with spring, and the disc spacing of same height in frock, fix A type test piece in spring inner core position, realize and connect with shot blasting machine carousel etc. function, can accurately simulate spring actual shot blasting working condition, ensure that test piece is in the key stress area, solved the technical problem that traditional detection method can not accurately measure shot blasting strength, has the advantages such as accurate detection data, simple operation, good repeatability.

Description

Technical Field

[0001] This utility model relates to the field of shot blasting strength testing, specifically to a spring shot blasting strength testing fixture. Background Technology

[0002] In the spring manufacturing process, shot blasting is a key process for improving the fatigue life of springs. Traditional testing methods have significant drawbacks: when using a simple bracket to fix the type A test piece, it is impossible to accurately simulate the actual working conditions of the spring inside the shot blasting machine; and the method of directly holding the test piece for testing makes it difficult to ensure the stability of the testing position.

[0003] The strength of the type A test piece was then judged by comparison with other test pieces or experience, a process that was highly irregular. This type of testing cannot guarantee that the spring is subjected to shot blasting in a uniform or scientific posture every time, resulting in large randomness in the impact angle and coverage area of ​​the shot stream, high dispersion in the test data, and poor repeatability. A more prominent problem is that existing testing methods cannot achieve synchronous rotation between the test piece and the spring, causing measurement errors in the impact angle and strength of the shot blasting stream. The results heavily rely on the operator's experience, making it impossible to obtain quantifiable shot blasting strength values ​​that are compatible with international standards. Consequently, it is difficult to accurately guide and optimize the process, directly affecting the reliability and stability of the spring's fatigue life and hindering the improvement of product quality. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this application is to provide a spring shot blasting strength testing fixture, which has the advantages of accurately simulating the actual working conditions of the spring in the shot blasting machine, ensuring the stability of the testing position, realizing synchronous rotation of the test piece and the spring, and improving the accuracy of the testing data.

[0005] This application provides a spring shot blasting strength testing fixture, the technical solution of which is as follows: it includes upper and lower discs, the two discs are connected and fixed by a ring-shaped column and a support plate, a pad is fixed on the inner side of the center of the support plate, and an A-type test piece for testing the spring shot blasting strength is installed in the pad.

[0006] Furthermore, this application also proposes that the distance between the two disks is the same as the height of the spring.

[0007] Furthermore, this application also proposes that when the tooling and the spring are simultaneously installed on the hook of the turntable inside the shot peening machine, the position of its type A test piece is at the position of the inner core of the shot peening spring.

[0008] Furthermore, this application also proposes that the two discs have a central hole for connecting with a hook on the internal turntable of the shot peening machine.

[0009] Furthermore, this application also proposes that the two pads are fixedly connected to the support plate by hex socket screws, and the type A test piece is fixed to the pads by screws.

[0010] Compared with existing technologies, the beneficial effects of this utility model are as follows: By setting up the same tooling as the spring, with the same spacing between the discs of the same height in the tooling, fixing the A-type test piece in the inner core of the spring, and realizing the connection with the turntable of the shot blasting machine, this utility model can accurately simulate the actual shot blasting conditions of the spring, ensuring that the test piece is in the critical stress area. It solves the technical problem that traditional testing methods cannot accurately measure the shot blasting intensity, and has the advantages of accurate test data, simple operation, and good repeatability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Top view; Figure 3 This is a schematic diagram of the practical usage status; In the diagram: 1. Disc; 2. Column; 3. Screw; 4. Type A test piece; 5. Support plate; 6. Backing plate; 7. Socket head screw; 8. Shot peening machine; 9. Chain conveyor; 10. Turntable; 11. Hook; 12. Nozzle; 13. Spring. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: like Figure 1-3 As shown, this application proposes a spring shot blasting strength testing fixture, including upper and lower discs. The two discs are connected and fixed by a ring-shaped column and a support plate. A pad is fixed on the inner side of the center of the support plate, and an A-type test piece for testing the spring shot blasting strength is installed in the pad.

[0013] The disc can be forged and precision machined from 45# steel, with a preferred diameter of 100-150mm and a thickness of 15-25mm. The uprights can be two steel cylinders, 10-20mm in diameter, fixed to the disc by welding. The support plate is a strip of steel plate, arranged in a ring with the two uprights, with a thickness of 10-15mm, and has positioning steps on its inner side for mounting the pad. The pad is a detachable structure, made of tool steel with a hardness of HRC50-55, and a standard type A test piece is mounted in the center using countersunk screws.

[0014] Specifically, the two circularly arranged columns and one support plate form a stable spatial support structure capable of withstanding the alternating loads generated by shot blasting. The pad is precision-machined to ensure that the flatness error of the A-type test piece does not exceed 0.05mm, keeping the test piece surface perpendicular to the shot blasting flow. This is one preferred embodiment.

[0015] This technical solution simulates the spatial position of a spring within a shot peening machine using a rigid frame structure. The combined design of the columns and support plates provides the fixture with sufficient resistance to deformation, ensuring that the position of the A-type test piece does not shift during shot peening. The precise positioning function of the pad ensures that the test piece is placed within the equivalent region of the spring core, thus obtaining shot peening intensity data that accurately reflects the actual shot peening state of the spring. Compared to handheld testing methods, this fixture eliminates testing errors caused by human factors. Through structural design, it achieves spatial equivalence between the test piece position and the shot-peening area of ​​the spring, solving the technical problem that traditional methods cannot accurately simulate the actual shot peening state of the spring.

[0016] Furthermore, this application also proposes that the distance between the two disks is the same as the height of the spring.

[0017] This technical solution establishes an equal relationship between the disk spacing and the spring height, ensuring that the fixture can simulate the spring height. This ensures that the A-type test piece forms a stable spatial correspondence with the spring core, accurately replicating the actual trajectory of the shot flow on the inner wall of the spring during shot blasting. Compared to existing technologies, this spacing matching design eliminates random errors from manual positioning, allowing the test piece's test data to truly reflect the spring's impact strength within the shot blasting machine, and solving the problem of inaccurate testing caused by positional deviations in traditional methods.

[0018] Furthermore, this application also proposes that when the tooling and the spring are simultaneously installed on the hook of the turntable inside the shot peening machine, the position of its type A test piece is at the position of the inner core of the shot peening spring.

[0019] Specifically, the inner core position of the spring refers to the core area of ​​the spring that is actually impacted by shot blasting inside the shot blasting machine. This position can be achieved in the following ways: fixing the type A test piece at a specific height inside the tooling to ensure spatial consistency with the actual force-bearing position of the spring during operation; or adjusting the relative position of the support plate and the pad to make the center line of the test piece coincide with the spring axis.

[0020] Therefore, this technical solution precisely controls the installation position of the type A test piece, ensuring it aligns with the actual stress position of the spring during operation. As the fixture rotates with the shot peening machine turntable, the shot flow distribution on the test piece is completely equivalent to that of the spring core region, thus obtaining representative shot peening strength test data. Compared to existing technologies, this solution effectively eliminates detection errors caused by test piece position deviations, ensuring the test results accurately reflect the shot peening strength of the spring core and resolving the data deviation problem caused by inaccurate test piece positioning in traditional methods.

[0021] Furthermore, this application proposes that the two discs have a centrally located circular hole for connecting with a hook on the internal turntable of the shot peening machine. The diameter of this circular hole matches the size of the hook on the shot peening machine turntable; specifically, the diameter of the circular hole can be designed to be 1.05-1.2 times the hook diameter to ensure assembly clearance. As a preferred embodiment, the edge of the circular hole can be chamfered to avoid stress concentration during hook contact. Furthermore, a wear-resistant bushing can be added to the inner wall of the circular hole to extend its service life. Thus, this connection structure allows the tooling to rotate synchronously with the shot peening machine turntable while ensuring reliable connection.

[0022] By directly connecting the tooling to the shot peening machine turntable hook through the central hole of the disc, the tooling can accurately simulate the motion of a spring within the shot peening machine. Specifically, the hook connection allows the tooling to achieve the same radius of rotation and angular velocity as the spring, where the radius of rotation is determined by the hook's installation position, and the angular velocity matches the rotational speed of the shot peening machine turntable. This structure solves the technical problem of achieving synchronous movement that traditional handheld or simple bracket fixing methods cannot achieve. Compared with existing technologies, this connection method ensures that the motion trajectory and stress environment of the A-type test piece are highly consistent with the spring, resulting in higher accuracy in the obtained shot peening strength test data. Furthermore, the mechanical hook connection avoids the reliability issues that may exist with electrical or pneumatic connections, making it suitable for the high-intensity vibration conditions of shot peening machines.

[0023] Furthermore, this application also proposes that the two pads are fixedly connected to the support plate by hex socket screws, and the type A test piece is fixed to the pads by screws.

[0024] The socket head cap screws can be standard parts of M4-M8 specifications, and their thread length must meet the total thickness of the washer and support plate. The washer material is preferably 45# steel or 304 stainless steel, with a thickness of 5-10mm, and the surface must be rust-proofed. When fixing the type A test piece, countersunk screws of M3-M5 specifications can be used, and the mounting hole positions must precisely match the pre-drilled holes on the test piece. As a preferred embodiment, a positioning boss can be machined on the contact surface between the washer and support plate to improve assembly accuracy.

[0025] This technical solution achieves dual fixation through a rigid connection structure: the hexagon socket screws form an integral frame between the pad and the support plate, ensuring the stability of the main tooling structure; the screw fixation keeps the A-type test piece and the pad without relative displacement. Specifically, under the high-speed rotation of the shot peening machine, the anti-loosening properties of the hexagon socket screws effectively resist centrifugal force, preventing the connecting parts from loosening; while the screw fixation method for the test piece ensures positioning accuracy and facilitates periodic replacement of worn test pieces. The resulting fixation system allows the test piece to completely reproduce the actual movement trajectory of the spring core, reducing the fluctuation range of test data by more than 60% compared to the traditional handheld method. This structure solves the contradiction between test piece positioning accuracy and ease of assembly and disassembly through modular design. The pad, as a transition component, not only bears the force transmission function but also provides a standardized installation interface for the test piece.

[0026] The implementation principle of a spring shot blasting strength testing fixture in this application embodiment is as follows: Before testing, the fixture is placed flat on the platform, the screws are removed, and the type A test piece is placed on the pad. After fixing the type A test piece with screws, it is hung together with several springs to be shot-blasted on multiple hooks at the bottom of the turntable of the shot blasting machine. As the metal particles ejected from the inclined nozzles inside the shot blasting machine are shot-blasted, the turntable 10 rotates. Simultaneously, the type A test piece 4 and the springs inside the fixture are shot-blasted under the same conditions. After blasting, the strength of the type A test piece is measured, thus determining the shot blasting strength of the spring. This achieves synchronous and identical shot blasting of the spring and the test piece, thereby directly and accurately quantifying the shot blasting strength value of the spring. This fixture greatly improves the reliability, consistency, and efficiency of the test results, effectively overcomes interference from human factors, and provides key technical support for the precise control and quality assessment of the spring shot blasting process.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A spring shot blasting strength testing fixture, characterized in that: It includes a disc (1) at the top and bottom. The two discs (1) are connected and fixed by a column (2) and a support plate (5) arranged in a ring. A pad (6) is fixed on the inner side of the center of the support plate (5). A type A test piece (4) for testing the shot blasting strength of the spring is installed in the pad (6).

2. The spring shot blasting strength testing fixture according to claim 1, characterized in that: The distance between the two disks (1) is the same as the height of the spring (13).

3. The spring shot blasting strength testing fixture according to claim 1, characterized in that: When the tooling and the spring (13) are installed on the hook (11) of the turntable (10) inside the shot blasting machine (8), the position of its type A test piece (4) is at the inner core position of the shot blasting spring (13).

4. The spring shot blasting strength testing fixture according to claim 2, characterized in that: The two discs (1) have a central hole for connecting to a hook (11) inside the turntable (10) of the shot peening machine (8).

5. The spring shot blasting strength testing fixture according to claim 1, characterized in that: The two pads (6) are fixedly connected to the support plate (5) by hexagonal screws (7), and the type A test piece (4) is fixed to the pads (6) by screws (3).

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