A torsion spring tempering fixture

Abstract

A torsion spring tempering fixing device, comprising a support frame for supporting the spring, the support frame comprising two transversely parallel arranged support rods, the distance between the two support rods being 76-80 mm, a plurality of longitudinally extending bottom rods being fixedly connected below the support rods, the support frame two ends being respectively provided with a positioning ring for fixing the end region of the spring, the distance between the two positioning rings being 510-550 mm, the diameter of the positioning ring being the same as the diameter of the spiral turn of the torsion spring, and further comprising a plurality of fixing devices for fixing the end region of the spring with the positioning ring.

Description

Technical Field

[0001] This utility model relates to the field of spring tempering, specifically providing a torsion spring tempering fixing device. Background Technology

[0002] A special torsion spring is made of a 3*10mm rectangular cross-section material, with more than 100 coils. The spacing between the coils is 2mm, the diameter of the coils is 83.3mm, and the length of a single finished product reaches 500mm, thus forming its inherent flexible properties.

[0003] For springs with the above-mentioned structure, in order to improve the collapse phenomenon during quenching, the spring is usually pressed until all coils are in contact, fixed on the tooling, and then quenched together with the tooling. However, this quenching method results in the spring's free height not meeting the semi-finished product height requirements of the process after quenching.

[0004] In the utility model patent with authorization announcement number CN205635708U, a positioning sleeve is fitted onto the screw, and a spiral groove is set on the positioning sleeve. After the spring is screwed into the spiral groove and the two ends are fixed, the spring is then heat-treated. However, this treatment method is only suitable for ordinary springs. When the torsion spring mentioned above is fixed by using external force to limit each coil of the spring and then tempered, it will result in large deformation and a high scrap rate after tempering. Therefore, there is an urgent need for a special tempering fixing fixture for this type of torsion spring. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides a tempering fixing fixture for torsion springs, which ensures that the free height of the spring after tempering meets process requirements, with minimal tempering deformation and a high pass rate.

[0006] The technical solution of this utility model is as follows: a tempering fixing device for a torsion spring, comprising a support frame for supporting the spring, the support frame comprising two horizontally parallel support rods with a distance of 76-80mm between the two support rods, a plurality of longitudinally extending base rods fixedly connected below the support rods, and positioning rings for fixing the end area of ​​the spring respectively provided at both ends of the support frame, the distance between the two positioning rings being 510-550mm, the diameter of the positioning rings being the same as the diameter of the spiral coil of the torsion spring, and further comprising a plurality of fixing devices for fixing the end area of ​​the spring to the positioning rings.

[0007] Preferably, both the support rod and the bottom rod are hollow tubes, and both the support rod and the bottom rod are provided with multiple holes to prevent deformation at high temperatures.

[0008] Preferably, the support rod is fixedly connected to the base rod and the positioning ring by welding.

[0009] Preferably, the fixing device includes a U-shaped clamp with screw holes on both sides, and a bolt passes through the screw holes to cooperate with a nut to form a fixation.

[0010] Preferably, the thickness of the U-shaped clamp is less than its width.

[0011] The advantages of this invention are as follows: This invention stretches the torsion spring to the positioning rings at both ends of the support frame, and uses U-shaped clamps to fix the spring end area (the end area refers to the first coil at the end of the spring and the first two spiral coils near the end) to the positioning rings, allowing the torsion spring to be in a freely stretched state. Then, this device and the spring are tempered together. This ensures the tempering length of the torsion spring, reduces heat treatment deformation, and avoids the difficulties of repeated corrections and stress-relief tempering after multiple corrections caused by deformation. It is suitable for mass production of similar torsion springs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention for clamping a torsion spring;

[0013] Figure 2 This is a schematic diagram of the structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the U-shaped clamp of this utility model;

[0015] Figure 4 This is a cross-sectional structural diagram of the long support rod of this utility model;

[0016] Figure 5 This is a schematic diagram of the torsion spring of this utility model. Detailed Implementation

[0017] See Figures 1 to 5A torsion spring tempering fixing device includes a support frame for supporting the spring. The support frame includes two horizontally parallel support rods 1, with a distance of 76-80mm between the two support rods 1. Multiple longitudinally extending base rods 2 are fixedly connected below the support rods 1. The support rods 1 and base rods 2 are arranged horizontally and vertically to prevent deformation of the support frame. Both the support rods 1 and base rods 2 are hollow tubes, and multiple holes 6 are provided on both support rods 1 and base rods 2 to prevent high-temperature deformation. This arrangement ensures that the device will not expand and deform due to high temperature during tempering, thus preventing the device from becoming unusable. Positioning rings 3 are respectively provided at both ends of the support frame to fix the end area of ​​the spring. The distance between the two positioning rings 3 is 510-550mm. When the torsion spring is stretched to this range for tempering, the free height of the torsion spring after tempering meets the process requirements. The support rods 1, base rods 2, and positioning rings 3 are all fixedly connected by welding. The diameter of the positioning rings 3 is the same as the diameter of the spiral coil of the torsion spring, ensuring that the end area of ​​the torsion spring can be fixed to the positioning rings 3. It also includes multiple fixing devices 4 for securing the spring end region to the positioning ring 3. Each fixing device 4 includes a U-shaped clamp 41 with screw holes 42 on both sides. A bolt 43 passes through the screw holes 42 and engages with a nut 44 to form a fixation. The thickness S of the U-shaped clamp 41 is less than its width W, increasing the strength of the U-shaped clamp 41.

[0018] The process of using this utility model is as follows: stretch both ends of the torsion spring that needs to be tempered to the positioning rings on both sides of the device, and fix the end areas of the torsion spring to the positioning rings with three U-shaped clips. The positions of the three U-shaped clips are the uppermost part of the positioning ring and the two welded joints between the positioning ring and the support rod, so as to ensure that the torsion spring does not fall off. Then, lock the U-shaped clips with bolts and nuts, and finally temper the device and the torsion spring at high temperature.

[0019] 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 made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A torsion spring tempering and fixing device, characterized in that: The support frame includes a support frame for supporting the spring, the support frame includes two horizontally parallel support rods (1) with a distance of 76-80 mm between the two support rods (1), and multiple longitudinally extending bottom rods (2) are fixedly connected below the support rods (1). The support frame is provided with positioning rings (3) at both ends for fixing the end area of ​​the spring, the distance between the two positioning rings (3) is 510-550 mm, the diameter of the positioning rings (3) is the same as the diameter of the spiral coil of the torsion spring, and also includes multiple fixing devices (4) for fixing the end area of ​​the spring to the positioning rings (3).

2. The torsion spring tempering fixing device according to claim 1, characterized in that: Both the support rod (1) and the bottom rod (2) are hollow tubes, and both the support rod (1) and the bottom rod (2) are provided with multiple holes (6) to prevent high-temperature deformation.

3. The torsion spring tempering fixing device according to claim 1, characterized in that: The support rod (1) is fixedly connected to the bottom rod (2) and the positioning ring (3) by welding.

4. The torsion spring tempering fixing device according to claim 1, characterized in that: The fixing device (4) includes a U-shaped clamp (41), with screw holes (42) on both sides of the U-shaped clamp (41). A bolt (43) passes through the screw holes (42) and cooperates with a nut (44) to form a fixation.

5. The torsion spring tempering fixing device according to claim 4, characterized in that: The thickness (S) of the U-shaped clamp (41) is less than its width (W).

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