Square steel torsion spring handcrafting tool and method
By designing a tooling system for the manual production of square steel torsion springs, and utilizing existing equipment for close-coil winding, hook forming, and pitch opening operations, the problem of excessively high costs in small-batch production was solved, achieving economical and efficient manual production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XINXIANG HUIHUANG SPRING
- Filing Date
- 2023-09-15
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the production of custom-made 3*10 square steel torsion springs requires a torsion spring machine with a diameter of 8 mm or more, resulting in excessively high procurement costs and making small-batch production uneconomical.
A tooling for the manual fabrication of square steel torsion springs was designed, including a close-coil rolling die, a hook forming die, and a starting pitch die. The tooling is manufactured manually using existing lathes and stamping machines. By coordinating the close-coil rolling die, the hook forming die, and the starting pitch die, the close-coil rolling, hook forming, and starting pitch operations are completed.
This technology enables the production of small-batch customized square steel torsion springs, reducing enterprise costs, improving work efficiency, ensuring coiling quality, and eliminating the need to purchase expensive torsion spring machines.
Smart Images
Figure CN117380878B_ABST
Abstract
Description
Technical fields:
[0001] This invention relates to the field of spring manufacturing technology, and in particular to a tooling and manufacturing method for manually making square steel torsion springs. Background technology:
[0002] Currently, torsion spring machines are generally used for torsion spring production. However, the production of custom-made 3*10 square steel torsion springs requires a torsion spring machine with a diameter of 8 mm or more. Since the company does not currently have a torsion spring machine with a diameter of 8 mm or more, after calculating the costs of such small-batch custom products, the company believes that purchasing a torsion spring machine with a diameter of 8 mm or more would be too expensive, resulting in expenses exceeding product profits. Therefore, the company has decided to use existing equipment to create a tooling system that can manually produce the custom products to meet production needs. Summary of the Invention:
[0003] To address the aforementioned technical problems, this invention provides a tooling and manufacturing method for manually making square steel torsion springs, solving the problem that adjusting the outer diameter and spacing of springs using needle-nose pliers can easily cause hand muscle soreness.
[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution: a tooling for manually manufacturing square steel torsion springs, including a close-coil rolling mold, a hook forming mold, and a starting pitch mold, characterized in that: the close-coil rolling mold includes a rolling mandrel, a limiting plate, and a rolling handle; the limiting plate is coaxially fixed at one-quarter of the rolling mandrel, dividing the rolling mandrel into a rolling end and a fixed end; a first limiting groove is provided on the side of the limiting plate near the rolling end for one end of the square steel to be inserted for limiting; one end of the rolling handle is slidably fitted onto the rolling end along the axis of the rolling mandrel; a limiting block is provided on the side of the rolling handle near the limiting plate; the end of the limiting block is provided with a second limiting groove for the other end of the square steel to be inserted for guiding and limiting; and a countersunk hole is provided on the rolling mandrel at the rolling end.
[0005] The hook forming mold includes a forming handle, a rotating shaft, and a forming vertical rod. One end of the rotating shaft is connected to the end of the forming handle, and the end of the forming vertical rod is fixed to the forming handle and parallel to the rotating shaft. The other end of the rotating shaft can be inserted into the countersunk hole in a pluggable manner.
[0006] The starting pitch mold includes a fixing block, and the top of the fixing block has a ridge-like structure.
[0007] Furthermore, the end of the winding handle is provided with a through hole fitted onto the winding end, and the limiting block is detachably connected to the winding handle by bolts.
[0008] Furthermore, the end of the limiting block with the second limiting groove has a slope on the side near the limiting plate.
[0009] Furthermore, the winding mandrel at the winding end is provided with winding scales, and the countersunk hole is located at the winding scales.
[0010] Furthermore, both the rolling handle and the forming handle are provided with rubber sleeves, and the outer surface of the rubber sleeves is provided with anti-slip textures.
[0011] To solve the above-mentioned technical problems, another technical solution provided by the present invention is: a method for manually manufacturing square steel torsion springs, the steps of which are: Step 1: manufacture the above-mentioned dense coil rolling mold, hook forming mold and starting pitch mold, fix the fixed end of the rolling mandrel in the dense coil rolling mold on a lathe, fix the starting pitch mold on the stamping platform of the stamping machine, and make the ridge-shaped structure of the starting pitch mold face vertically upward.
[0012] Step 2: One end of the square steel is embedded in the first limiting groove on the limiting plate for limiting. The rolling handle is slidably sleeved on the rolling end of the rolling mandrel through the through hole. The other end of the square steel is embedded in the second limiting groove for limiting. When the machine tool drives the rolling mandrel and the first limiting groove to rotate, the operator applies a force opposite to the direction of rotation to the rolling handle so that the rolling handle remains stationary in the radial direction of the rolling mandrel. Under the push of the square steel wrapped around the rolling mandrel, the rolling handle automatically moves away from the limiting plate along the axis of the rolling mandrel, realizing the rolling of the square steel on the rolling mandrel. After the rolling operation is completed, the rolling handle is removed from the rolling mandrel.
[0013] Step 3: Insert the other end of the rotating shaft into the countersunk hole on the rolling mandrel, so that the forming vertical rod and the rotating shaft are on both sides of the square steel. During the process of rotating the forming vertical rod around the rotating shaft by the forming handle, the forming vertical rod pushes the square steel to bend and rotate around the rotating shaft. After the hook forming operation is completed, remove the rotating shaft from the countersunk hole.
[0014] Step 4: Remove the torsion spring after the hook forming operation and place it on the ridge line of the roof-like structure of the fixed block. Press the torsion spring by moving the slider of the press downward, so that the roof-like structure of the fixed block extends into the torsion spring, completing the opening pitch operation.
[0015] Furthermore, in step two, during the winding process, it is observed whether the winding handle reaches the winding scale. If the winding handle reaches the winding scale and the side of the winding handle away from the limit plate is aligned with the winding scale, the winding mandrel stops rotating to complete the winding operation. If the winding handle does not reach the winding scale and the side of the winding handle away from the limit plate is not aligned with the winding scale, the winding mandrel continues to rotate to perform the winding operation.
[0016] Furthermore, in step two, the process of embedding the square steel into the second limiting groove is as follows: the rolling handle is fitted onto the rolling mandrel through the through hole and moves toward the limiting plate. When the second limiting groove moves above the other end of the square steel, the rolling handle is rotated in the opposite direction to the rotation of the rolling mandrel so that the second limiting groove fits onto the square steel.
[0017] Furthermore, in step two, the process of removing the coiling handle from the coiling mandrel is as follows: the coiling handle is rotated upward in the direction of rotation of the coiling mandrel, so that the square steel is moved out of the second limiting groove and moves away from the limiting plate along the axis of the coiling mandrel.
[0018] The beneficial effects of this invention are as follows:
[0019] 1. This application utilizes the cooperation between the close-coil rolling die, the hook forming die, and the starting pitch die to complete the three-step operation of close-coil rolling, hook forming, and starting pitch sequentially using existing lathes and stamping machines. This enables manual production of torsion springs to meet production needs, thereby saving the cost of purchasing a torsion spring machine and reducing enterprise expenses.
[0020] 2. In this application, one end of the square steel is limited by the first limiting groove and the other end of the square steel is limited by the second limiting groove. When the machine tool drives the rolling mandrel and the first limiting groove to rotate, the square steel is rolled on the rolling mandrel, thereby realizing manual rolling operation. At the same time, the square steel moves in the second groove during the rolling process, realizing the limiting and guiding function of the square steel, facilitating the rolling operation and ensuring the rolling quality.
[0021] 3. After the square steel is rolled in this application, the other end of the rotating shaft is inserted into the countersunk hole on the rolling mandrel (the pluggable operation of the rotating shaft and the rolling mandrel does not affect the rolling operation of the square steel by rotating the rolling mandrel). The forming vertical rod and the rotating shaft are positioned on both sides of the square steel. During the process of rotating the forming vertical rod around the rotating shaft by the forming handle, the forming vertical rod pushes the square steel to bend and rotate around the rotating shaft, thereby realizing the manual forming operation of the hook. The hook forming operation is carried out by using the countersunk hole on the rolling mandrel, realizing two uses in one. There is no need to remove the rolled square steel or make a separate hook forming part, which improves work efficiency and reduces costs.
[0022] 4. In this application, the torsion spring after the hook forming operation is removed and placed on the ridge line on the top of the fixing block. The opening pitch operation is completed by using an existing stamping machine, and only the fixing block needs to be made separately, thus reducing costs.
[0023] 5. In this application, the limiting block and the rolling handle are detachably connected by bolts. When the square steel moves in the second limiting groove on the limiting block, it will cause wear on the moving block. The detachable connection makes it easy to replace the limiting block.
[0024] 6. In this application, the end of the limiting block with the second limiting groove is provided with a slope near the limiting plate. By setting the slope, the spacing of the torsion springs can be adjusted. When the slope is large, the spacing of the torsion springs becomes smaller, and when the slope is small, the spacing of the torsion springs becomes larger.
[0025] 7. In this application, the rolling mandrel at the rolling end is provided with a rolling scale, and the countersunk hole is located at the rolling scale. When rolling square steel, the rolling operation is stopped after the rolling handle moves to the rolling scale. Then, the hook forming operation is performed by the hook forming mold. The operator does not need to judge whether to stop the rolling operation by counting the number of turns.
[0026] 8. Both the rolling handle and the forming handle in this application are provided with rubber sleeves, and the outer surface of the rubber sleeves is provided with anti-slip textures. The rubber sleeves increase the comfort of the operator, and the anti-slip textures also have an anti-slip effect, increase friction, and prevent accidental slippage during operation.
[0027] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached image description:
[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only fourteen of the drawings in this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0029] Figure 1 A schematic diagram of the structure of a close-loop rolling die;
[0030] Figure 2 This is a schematic diagram of the structure of the rolled handle;
[0031] Figure 3 This is a schematic diagram of the limiting block.
[0032] Figure 4 This is a schematic diagram of the hook forming mold.
[0033] Figure 5 This is a schematic diagram of the structure of the starting pitch mold;
[0034] Figure 6 This is a schematic diagram of the structure during the close-loop winding operation;
[0035] Figure 7 The front view of the semi-finished torsion spring after the close-coil winding operation;
[0036] Figure 8 for Figure 7The left view;
[0037] Figure 9 This is a structural diagram illustrating the hook forming process.
[0038] Figure 10 The front view of the semi-finished torsion spring after the hook forming operation;
[0039] Figure 11 for Figure 10 A bottom view;
[0040] Figure 12 This is a schematic diagram of the structure during the pitch opening operation;
[0041] Figure 13 This is a schematic diagram of the torsion spring after the pitch opening operation.
[0042] Figure 14 This is a physical image of the object used in this application.
[0043] In the diagram, 1-rolling mandrel, 2-limiting disc, 3-rolling handle, 4-first limiting groove, 5-limiting block, 6-second limiting groove, 7-counterhead, 8-through hole, 9-bolt, 10-forming handle, 11-rotating shaft, 12-forming vertical rod, 13-fixing block, 14-ridge-shaped structure, 15-slope, 16-rolling scale; A-torsion spring, B-lathe, C-stamping platform, D-slider. Detailed implementation method:
[0044] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.
[0045] It should be understood that the steps described in the method embodiments of the present invention may be performed in different orders. Furthermore, the method embodiments may include additional steps or omit the steps shown. The scope of the present invention is not limited in this respect.
[0046] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.
[0047] Example 1
[0048] like Figures 1-13As shown, a tooling for manually manufacturing square steel torsion springs includes a close-coil rolling die, a hook forming die, and a pitch-starting die. By coordinating the close-coil rolling die, the hook forming die, and the pitch-starting die, the three steps of close-coil rolling, hook forming, and pitch-starting are completed sequentially using an existing lathe B and a stamping machine. This enables manual manufacturing of torsion springs A to meet production needs, thereby eliminating the need to purchase a torsion spring A machine and reducing enterprise expenses.
[0049] The dense coiling die includes a coiling mandrel 1, a limiting plate 2, and a coiling handle 3. The limiting plate 2 is coaxially fixed at one-quarter of the coiling mandrel 1, dividing the coiling mandrel 1 into a coiling end and a fixed end. A first limiting groove 4 is provided on the limiting plate 2 near the coiling end, allowing one end of a square steel bar to be inserted for limiting. One end of the coiling handle 3 is slidably fitted onto the coiling end along the axis of the coiling mandrel 1. A limiting block 5 is provided on the coiling handle 3 near the limiting plate 2, with the other end of the limiting block 5 inserted into it. The second limiting groove 6 for guiding and limiting the movement of the square steel is provided with a countersunk hole 7 on the rolling mandrel 1 at the rolling end. The square steel is limited at one end by the first limiting groove 4 and at the other end by the second limiting groove 6. When the machine tool drives the rolling mandrel 1 and the first limiting groove 4 to rotate, the square steel is rolled on the rolling mandrel 1, thus realizing manual rolling operation. At the same time, the square steel moves in the second groove during the rolling process, realizing the limiting and guiding function of the square steel, facilitating the rolling operation and ensuring the rolling quality.
[0050] The hook forming mold includes a forming handle 10, a rotating shaft 11, and a forming vertical rod 12. One end of the rotating shaft 11 is connected to the end of the forming handle 10, and the end of the forming vertical rod 12 is fixed to the forming handle 10 and parallel to the rotating shaft 11. The other end of the rotating shaft 11 can be inserted into the countersunk hole 7. After the square steel is rolled, the other end of the rotating shaft 11 is inserted into the countersunk hole 7 on the rolling mandrel 1 (the insertable operation of the rotating shaft 11 and the rolling mandrel 1 does not affect the rolling operation of the rolling mandrel 1 on the square steel). The forming vertical rod 12 and the rotating shaft 11 are located on both sides of the square steel. During the process of the forming handle 10 driving the forming vertical rod 12 to rotate around the rotating shaft 11, the forming vertical rod 12 pushes the square steel to bend and rotate around the rotating shaft 11, thereby realizing the manual forming operation of the hook. The hook forming operation is performed by using the countersunk hole 7 on the rolling mandrel 1, realizing two uses in one. There is no need to remove the rolled square steel or make a separate hook forming part, which improves work efficiency and reduces costs.
[0051] The starting pitch mold includes a fixing block 13, and the top of the fixing block 13 has a ridge-shaped structure 14. The torsion spring A after the hook forming operation is removed and placed on the ridge line on the top of the fixing block 13. The starting pitch operation is completed by using an existing stamping machine, and only the fixing block 13 needs to be made separately, which reduces the cost.
[0052] The end of the rolling handle 3 is provided with a through hole 8 that is fitted onto the rolling end, and the limiting block 5 is detachably connected to the rolling handle 3 by bolts 9. The limiting block 5 is detachably connected to the rolling handle 3 by bolts 9. When the square steel moves in the second limiting groove 6 on the limiting block 5, it will cause wear on the moving block. The detachable connection makes it easy to replace the limiting block 5.
[0053] Based on the description of the structure of the dense coil rolling die, hook forming die, and starting pitch die, the dense coil rolling die, hook forming die, and starting pitch die are manufactured using equipment such as cutting machines and welding machines. The process of manufacturing the torsion spring using the dense coil rolling die, hook forming die, and starting pitch die is another technical solution protected in this application. This technical solution is: a manual manufacturing method for square steel torsion springs, the specific manufacturing process of which is: the fixed end of the coiled mandrel 1 is fixed on lathe B. One end of the square steel is embedded in the first limiting groove 4 for limiting. The coiling handle 3 is slidably sleeved on the coiling end of the coiling mandrel 1 through the through hole 8. The other end of the square steel is embedded in the second limiting groove 6 for limiting. When the machine tool drives the coiling mandrel 1 and the first limiting groove 4 to rotate, the operator applies a force opposite to the direction of rotation to the coiling handle 3 to keep the coiling handle 3 stationary in the radial direction. Under the push of the square steel wrapped around the coiling mandrel 1, the coiling handle 3 automatically moves along the axis of the coiling mandrel 1, realizing the coiling of the square steel. The operator counts the number of turns wound on the mandrel 1. Once a certain number of turns are reached, the mandrel 1 stops rotating. The operator then rotates the winding handle 3 upwards in the direction of rotation of the mandrel 1, causing the square steel to move out of the second limiting groove 6. The winding handle 3 is then removed from the mandrel 1, completing the square steel winding. The other end of the rotating shaft 11 is inserted into the countersunk hole 7 on the mandrel 1, positioning the forming vertical rod 12 and the rotating shaft 11 on either side of the square steel. The forming handle 10 drives the forming vertical rod 12 to rotate around the rotating shaft 11. During the rotation, the forming vertical rod 12 moves the square steel to bend and rotate around the rotating shaft 11 to complete the hook forming operation. The fixing block 13 is pre-fixed on the stamping platform C of the stamping machine, and the ridge-shaped structure 14 of the fixing block 13 is vertically upward. The torsion spring A after the hook forming operation is removed and placed on the ridge line of the ridge-shaped structure 14 of the fixing block 13. The slider D of the stamping machine moves downward to squeeze the torsion spring A, so that the ridge-shaped structure 14 of the fixing block 13 extends into the torsion spring A, completing the opening pitch operation.
[0054] Example 2
[0055] like Figure 3 As shown, this embodiment is obtained by adding technical features such as slope 15 on the basis of embodiment one. The other technical features are the same as those in embodiment one. The similarities will not be repeated here. The difference between this embodiment and embodiment one is that a slope 15 is provided on the side of the limiting block 5 where the second limiting groove 6 is provided and the side is close to the limiting plate 2.
[0056] In this embodiment, by setting the slope of 15 degrees, it is convenient to adjust the spacing of the torsion springs A. When the slope of 15 degrees is large, the spacing of the torsion springs A becomes smaller, and when the slope of 15 degrees is small, the spacing of the torsion springs A becomes larger, thereby realizing the adjustment of the spring spacing.
[0057] Example 3
[0058] like Figure 1 As shown, this embodiment is obtained by adding technical features such as the rolling scale 16 on the basis of embodiment 2. The other technical features are the same as those in embodiment 2. The similarities will not be repeated here. The difference between this embodiment and embodiment 2 is that the rolling mandrel 1 at the rolling end is provided with the rolling scale 16, and the countersunk hole 7 is provided at the rolling scale.
[0059] In this embodiment, when the square steel is being rolled, the rolling handle 3 stops rolling after moving to the rolling scale 16, and then the hook forming operation is performed through the hook forming mold. The operator does not need to count the number of turns to determine whether to stop the rolling operation, thus preventing the operator from being disturbed when carefully counting the turns and causing the error in counting.
[0060] Example 4
[0061] This embodiment is obtained by adding technical features such as rubber sleeves based on embodiment three. The remaining technical features are the same as those in embodiment three, and the similarities will not be repeated here. The difference between this embodiment and embodiment three is that rubber sleeves are provided on both the rolling handle 3 and the forming handle 10, and the outer surface of the rubber sleeves is provided with anti-slip texture.
[0062] In this embodiment, the rubber sleeve increases the operator's comfort, while the anti-slip texture provides anti-slip properties, increases friction, and prevents accidental slippage during operation.
[0063] The method of using the overall technical solution formed by the above embodiments is another technical solution disclosed in this application. The technical solution is: a method for manually manufacturing square steel torsion springs, the steps of which are: Step 1: make the above-mentioned dense coil rolling mold, hook forming mold and starting pitch mold, fix the fixed end of the rolling mandrel in the dense coil rolling mold on a lathe, fix the starting pitch mold on the stamping platform of the stamping machine, and make the ridge-shaped structure of the starting pitch mold vertically upward.
[0064] Step 2: One end of the square steel is embedded in the first limiting groove on the limiting plate for limiting. The rolling handle is slidably sleeved on the rolling end of the rolling mandrel through the through hole. The other end of the square steel is embedded in the second limiting groove for limiting. When the machine tool drives the rolling mandrel and the first limiting groove to rotate, the operator applies a force opposite to the direction of rotation to the rolling handle to keep the rolling handle stationary in the radial direction of the rolling mandrel. Under the push of the square steel wrapped around the rolling mandrel, the rolling handle automatically moves away from the limiting plate along the axis of the rolling mandrel, realizing the rolling of the square steel on the rolling mandrel. After the rolling operation is completed, the rolling handle is removed from the rolling mandrel.
[0065] In step two, during the winding process, it is observed whether the winding handle reaches the winding scale. If the winding handle reaches the winding scale and the side of the winding handle away from the limit plate is aligned with the winding scale, the winding mandrel stops rotating and the winding operation is completed. If the winding handle does not reach the winding scale and the side of the winding handle away from the limit plate is not aligned with the winding scale, the winding mandrel continues to rotate to perform the winding operation.
[0066] In step two, the process of embedding the square steel into the second limiting groove is as follows: the rolling handle is fitted onto the rolling mandrel through the through hole and moves toward the limiting plate. When the second limiting groove moves above the other end of the square steel, the rolling handle is rotated in the opposite direction to the rotation of the rolling mandrel so that the second limiting groove fits onto the square steel.
[0067] In step two, the process of removing the rolling handle from the rolling mandrel is as follows: rotate the rolling handle upward in the direction of rotation of the rolling mandrel, so that the square steel moves out of the second limiting groove and moves away from the limiting plate along the axis of the rolling mandrel.
[0068] Step 3: Insert the other end of the rotating shaft into the countersunk hole on the rolling mandrel, so that the forming vertical rod and the rotating shaft are on both sides of the square steel. During the process of rotating the forming vertical rod around the rotating shaft by the forming handle, the forming vertical rod pushes the square steel to bend and rotate around the rotating shaft. After the hook forming operation is completed, remove the rotating shaft from the countersunk hole.
[0069] Step 4: Remove the torsion spring after the hook forming operation and place it on the ridge line of the roof-like structure of the fixed block. Press the torsion spring by moving the slider of the press downward, so that the roof-like structure of the fixed block extends into the torsion spring, completing the opening pitch operation.
[0070] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A method for manually manufacturing square steel torsion springs, using manufacturing fixtures. The manufacturing tooling includes a close-loop rolling mold, a hook forming mold, and a starting pitch mold. The close-loop rolling mold includes a rolling mandrel, a limiting plate, and a rolling handle. The limiting plate is coaxially fixed at one-quarter of the rolling mandrel, dividing the rolling mandrel into a rolling end and a fixed end. A first limiting groove is provided on the side of the limiting plate near the rolling end, allowing one end of a square steel bar to be inserted for limiting. One end of the rolling handle is slidably fitted onto the rolling end along the axis of the rolling mandrel. A limiting block is provided on the side of the rolling handle near the limiting plate. The end of the limiting block is provided with a second limiting groove, allowing the other end of a square steel bar to be inserted for guiding and limiting. A countersunk hole is provided on the rolling mandrel at the rolling end. The hook forming mold includes a forming handle, a rotating shaft, and a forming vertical rod. One end of the rotating shaft is connected to the end of the forming handle, and the end of the forming vertical rod is fixed to the forming handle and parallel to the rotating shaft. The other end of the rotating shaft can be inserted into the countersunk hole in a pluggable manner. The starting pitch mold includes a fixing block, and the top of the fixing block has a ridge-like structure; the end of the rolling handle is provided with a through hole fitted onto the rolling end; The steps are as follows: Step 1: Make the aforementioned close-loop rolling mold, hook forming mold and starting pitch mold, and fix the fixed end of the rolling mandrel in the close-loop rolling mold on the lathe, fix the starting pitch mold on the stamping platform of the stamping machine, and make the ridge-shaped structure of the starting pitch mold face vertically upward. Step 2: One end of the square steel is embedded in the first limiting groove on the limiting plate for limiting. The rolling handle is slidably sleeved on the rolling end of the rolling mandrel through the through hole. The other end of the square steel is embedded in the second limiting groove for limiting. When the lathe drives the rolling mandrel and the first limiting groove to rotate, the operator applies a force opposite to the direction of rotation to the rolling handle so that the rolling handle remains stationary in the radial direction of the rolling mandrel. Under the push of the square steel wrapped around the rolling mandrel, the rolling handle automatically moves away from the limiting plate along the axis of the rolling mandrel, realizing the rolling of the square steel on the rolling mandrel. After the rolling operation is completed, the rolling handle is removed from the rolling mandrel. Step 3: Insert the other end of the rotating shaft into the countersunk hole on the rolling mandrel, so that the forming vertical rod and the rotating shaft are on both sides of the square steel. During the process of rotating the forming vertical rod around the rotating shaft by the forming handle, the forming vertical rod pushes the square steel to bend and rotate around the rotating shaft. After the hook forming operation is completed, remove the rotating shaft from the countersunk hole. Step 4: Remove the torsion spring after the hook forming operation and place it on the ridge line of the roof-like structure of the fixed block. Press the torsion spring by moving the slider of the press downward, so that the roof-like structure of the fixed block extends into the torsion spring, completing the opening pitch operation.
2. The method for manually manufacturing a square steel torsion spring according to claim 1, characterized in that: The limiting block and the rolling handle are detachably connected by bolts.
3. The method for manually manufacturing a square steel torsion spring according to claim 1, characterized in that: The end of the limiting block with the second limiting groove is provided with a slope on the side near the limiting plate.
4. The method for manually manufacturing a square steel torsion spring according to claim 3, characterized in that: The winding mandrel at the winding end is provided with winding scale, and the countersunk hole is located at the winding scale.
5. The method for manually manufacturing a square steel torsion spring according to claim 4, characterized in that: Both the rolling handle and the forming handle are equipped with rubber sleeves, and the outer surface of the rubber sleeves is provided with anti-slip textures.
6. The method for manually manufacturing a square steel torsion spring according to claim 4, characterized in that: In step two, during the winding process, observe whether the winding handle reaches the winding scale. If the winding handle reaches the winding scale and the side of the winding handle away from the limit plate is aligned with the winding scale, the winding mandrel stops rotating to complete the winding operation. If the winding handle does not reach the winding scale and the side of the winding handle away from the limit plate is not aligned with the winding scale, the winding mandrel continues to rotate to perform the winding operation.
7. The method for manually manufacturing a square steel torsion spring according to claim 1, characterized in that: In step two, the process of embedding the square steel into the second limiting groove is as follows: the rolling handle is fitted onto the rolling mandrel through the through hole and moves toward the limiting plate. When the second limiting groove moves above the other end of the square steel, the rolling handle is rotated in the opposite direction to the rotation of the rolling mandrel so that the second limiting groove fits onto the square steel.
8. The method for manually manufacturing a square steel torsion spring according to claim 1, characterized in that: In step two, the process of removing the coiling handle from the coiling mandrel is as follows: rotate the coiling handle upward in the direction of rotation of the coiling mandrel so that the square steel moves out of the second limiting groove and moves away from the limiting plate along the axis of the coiling mandrel.