Bending device for torsion spring end arm

Abstract

The application discloses a torsion spring end torsion arm bending device. The device comprises an upper die, a lower die and a rotating device for realizing torsion spring torsion arm extrusion forming. The upper die is provided with a convex die matched with the torsion spring forming, and an upper die correction groove is arranged on the surface of the convex die in the transverse middle part. The lower die is provided with a concave die matched with the torsion spring forming, and a positioning groove is arranged on the surface of the concave die in the transverse middle part. The rotating device comprises a positioning core shaft, a rotating arm, a fixing shaft and a connecting plate. The device optimizes the traditional bending die, and the bending lower die is processed with a groove consistent with the wire axis to prevent the wire from slipping in the bending and pressing process. The device sets a rotatable anti-torsion device on the bending upper die by utilizing the characteristic that the bending material rotates around the bending point in the bending process, and the wire is limited to twist in the bending and pressing process. The device successfully solves the wire slipping and twisting caused by the fact that the wire axis is not perpendicular to the bending tire, and the produced torsion spring end torsion arm meets the product quality requirements and is stable in size.

Description

Technical Field

[0001] This invention belongs to the field of mechanical processing equipment design technology, and particularly to the field of spring processing machinery design technology, specifically relating to a torsion spring end torsion arm bending device. Background Technology

[0002] Standard torsion springs are generally formed by winding using a spring coiling machine. When the torsion arm at the end of the standard torsion spring does not match the actual requirements, a secondary bending process is often required. For example, the torsion spring used in a three-jointed railway freight car is different from the standard torsion spring, requiring the torsion arm at the end of the standard torsion spring to be bent by 90°. The bending point of this part coincides with a bending point of the torsion arm at the end of the standard torsion spring. If a traditional bending wheel is used for bending, because the axis of the bending wire is not perpendicular to the bending wheel, the bending wire in contact with the bending wheel is asymmetrical, resulting in inconsistent stress on the bending wire, causing slippage and torsion of the bending wire, making it impossible to produce stable and qualified products. Summary of the Invention

[0003] This invention discloses a torsion spring end torsion arm bending device to address the shortcomings of existing technologies. The invention aims to solve the problem of asymmetrical force on the bent wire caused by the non-perpendicularity between the bending wire axis and the bending jig, leading to slippage and torsion of the bent wire. Therefore, this invention provides a torsion spring end torsion arm bending device.

[0004] This invention is achieved through the following technical solution:

[0005] A device for bending the torsion arm at the end of a torsion spring, comprising an upper die and a lower die for extruding and forming the torsion arm of the torsion spring, characterized in that it further comprises a rotating device;

[0006] The upper die has a punch that matches the forming of the torsion spring, and a correction groove for the upper die is provided in the middle of the transverse direction of the punch surface;

[0007] The lower die has a cavity that matches the forming of the torsion spring, and a positioning groove is provided in the middle of the transverse direction on the surface of the cavity.

[0008] The rotating device includes a positioning mandrel, a rotating arm, a fixed shaft, and a connecting plate. One end of the positioning mandrel is perpendicularly connected and fixed to one end of the rotating arm, and the other end of the rotating arm is perpendicularly hinged and fixed to the end of the fixed shaft, allowing it to rotate around the fixed shaft. The positioning mandrel and the fixed shaft are axially parallel, forming a vertical Z-shaped structure. The axial center distance between the positioning mandrel and the fixed shaft is equal to the perpendicular distance between the axis of the torsion spring and the processing bending point. The outer diameter of the positioning mandrel is smaller than the inner diameter of the torsion spring, and it is clearance-fitted with the inserted torsion spring. The upper end of the connecting plate is connected and fixed to the side of the upper mold by bolts, and the other end is perpendicularly connected and fixed to the fixed shaft. The lower end of the connecting plate is connected to an L-shaped support arm. The extension axis of the support arm is parallel to the axis of the positioning mandrel and is located outside the lower mold, moving up and down with the connecting plate.

[0009] The lower die of this invention has a concave groove that matches the forming of the torsion spring, and the two wings of the concave groove are connected to the steps of the platform structure; the positioning groove includes a lower die correction groove set in the middle of the concave groove in the lateral direction and an anti-slip groove set in the middle of the two wing steps in the lateral direction and connected to the lower die correction groove.

[0010] Furthermore, the connecting plate is connected and fixed to the side of the upper mold via a pad, which is used to adjust the distance between the connecting plate and the end face of the upper mold.

[0011] Furthermore, a stepped boss is provided on one side of the lower end of the connecting plate. The surface of the boss contacts the rotating arm support to limit the rotation range of the rotating arm and keep the rotating arm horizontal in its free state.

[0012] Furthermore, a shrinking step is provided on one side of the upper die punch to avoid the torsion spring after bending.

[0013] Furthermore, an L-shaped support arm is provided on the other side of the lower end of the connecting plate to support the torsion arm at the end of the torsion spring and ensure that the standard torsion spring remains horizontal before bending.

[0014] The device of this invention has a rotatable device on the upper die, which can ensure accurate positioning and prevent the torsion spring from twisting during the bending process; the lower die has a groove processed along the wire axis to prevent the torsion spring from slipping during the bending process. This solves the problem of wire slippage and twisting caused by uneven bending force when the wire axis is not perpendicular to the bending jig. The torsion arm at the end of the torsion spring produced meets the product quality requirements and has stable dimensions.

[0015] This invention optimizes traditional bending dies by machining a groove on the lower bending die that aligns with the wire axis to prevent slippage during bending. Utilizing the characteristic of the bending material rotating around the bending point during bending, a rotatable anti-torsion device is installed on the upper bending die to limit wire torsion during bending. This invention successfully solves the problem of wire slippage and torsion caused by the wire axis not being perpendicular to the bending die. The torsion springs produced using this invention have torsion arms at the end that meet product quality requirements and exhibit dimensional stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the torsion spring end torsion arm bending device of the present invention.

[0017] Figure 2 This is a schematic diagram of the bending device and rotating mechanism of the present invention.

[0018] Figure 3 This is a schematic diagram of the connecting plate of the bending device of the present invention.

[0019] Figure 4 This is a schematic diagram of the upper die of the bending device of the present invention.

[0020] Figure 5This is a schematic diagram of the lower die of the bending device of the present invention.

[0021] Figure 6 This is a schematic diagram of the closed state of the bending device of the present invention;

[0022] Figure 7 This is a schematic diagram of an existing standard torsion spring;

[0023] Figure 8 This is a schematic diagram of the device for processing torsion springs according to the present invention.

[0024] Reference numerals in the attached diagram: 1 is the rotating device, 1.1 is the positioning mandrel, 1.2 is the rotating arm, 1.3 is the fixed shaft, 1.4 is the connecting plate, 1.5 is the pad, 1.4.1 is the positioning hole of the fixed shaft, 1.4.2 is the lower boss, 1.4.3 is the support arm, 2 is the upper mold, 2.1 is the upper mold correction groove, 2.2 is the threaded hole, 2.3 is the step, 3 is the lower mold, 3.1 is the anti-slip groove, 3.2 is the lower mold correction groove, 3.3 is the concave groove, 3.4 is the step, and 4 is the torsion spring. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principles of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the scope of protection of the present invention.

[0026] Refer to the attached diagram.

[0027] like Figure 1 As shown, the torsion spring end torsion arm bending device of the present invention includes a rotating device 1, an upper mold 2, a lower mold 3, and a torsion spring 4.

[0028] like Figure 2 As shown, the rotating device 1 includes: a positioning mandrel 1.1, a rotating arm 1.2, a fixed shaft 1.3, a connecting plate 1.4, and a pad 1.5. The positioning mandrel 1.1 is welded or screwed to the rotating arm 1.2 to form a single unit, and can rotate around the fixed shaft 1.3. The center distance between the positioning mandrel 1.1 and the fixed shaft 1.3 is equal to the perpendicular distance between the axis of the standard torsion spring 4 and the bending point. The outer diameter of the positioning mandrel 1.1 is slightly smaller than the inner diameter of the standard torsion spring 4. In this way, when the torsion arm at the end of the torsion spring bends, the torsion spring can rotate with the bending of the end torsion arm, while limiting the torsion in the axial direction of the torsion spring. One end of the connecting plate 1.4 is connected to the upper mold 2 with screws, and the other end is connected to the fixed shaft 1.3. The pad 1.5 is used to adjust the distance between the connecting plate 1.4 and the end face of the upper mold 2 to prevent the torsion device 1 from colliding with the lower mold 3 during the bending process.

[0029] like Figure 3As shown, the connecting plate 1.4 of the rotating device 1 includes: a fixed shaft positioning hole 1.4.1 for positioning and connecting the fixed shaft 1.3, whose center after assembly is vertically separated from the center of the bending arc of the upper die 2 by half a spring wire diameter. Its lower end boss 1.4.2 is used to limit the rotation range of the rotating arm 1.2, keeping the rotating arm 1.2 horizontal in its free state and allowing it to rotate only upwards. A support arm 1.4.3 is welded to its end to support the end torsion arm of the standard torsion spring 4, ensuring that the standard torsion spring 4 is horizontal before bending. The support arm 1.4.3 is L-shaped to maximize the support position and avoid the lower die 3.

[0030] like Figure 4 As shown, the upper die 2 has a groove 2.1 on its bending surface according to the shape of the part after bending, which serves to correct the shape of the torsion arm at the end of the torsion spring. At the same time, its end has a threaded hole 2.2 for installing the connecting plate 1.4 of the torsion device 1. The upper die 2 has a shrinking step 2.3 on one side of the bending head to avoid the torsion spring 4 after bending.

[0031] like Figure 5 As shown, the lower die 3 has a concave die that matches the forming of the torsion spring, and a positioning groove is provided in the middle of the transverse direction of the surface of the concave die; the lower die concave die has a concave groove 3.3 that matches the forming of the torsion spring, and the two wings of the concave groove 3.3 are connected to the steps 3.4 of the platform structure; the positioning groove includes a lower die correction groove 3.2 provided in the middle of the transverse direction of the concave groove 3.3 and an anti-slip groove 3.1 provided in the middle of the transverse direction of the two-wing steps 3.4 that connects to the lower die correction groove 3.2. The steps 3.4 of the lower die 3 are arranged horizontally, and the anti-slip groove 3.1 and the concave groove 3.3 provided on the steps 3.4 along the wire axis before the bending of the torsion arm at the end of the torsion spring, together with the upper die 2, correct the shape of the torsion arm at the end of the torsion spring in the lower die correction groove 3.2.

[0032] Device operation process: such as Figure 6 As shown, a standard torsion spring is inserted into the positioning mandrel 1.1 of the rotating device. The torsion arm at the end of the torsion spring 4 is supported on the L-shaped support arm 1.4.3 of the connecting plate 1.4. At this time, the standard torsion spring 4 is in a horizontal position. The upper mold 2 first slowly descends to ensure that the torsion arm at the end of the torsion spring 4 falls into the anti-slip groove 3.1 of the lower mold. The upper mold 2 continues to descend until the upper mold 2 and the lower mold 3 are closed. The torsion arm at the end of the torsion spring 4 is bent and corrected into the required shape.

Claims

1. A device for bending the torsion arm at the end of a torsion spring, comprising an upper die and a lower die for extruding and forming the torsion arm of the torsion spring, characterized in that: It also includes a rotating device; The upper die has a punch that matches the forming of the torsion spring, and a correction groove for the upper die is provided in the middle of the transverse direction of the punch surface; The lower die has a cavity that matches the forming of the torsion spring, and a positioning groove is provided in the middle of the transverse direction on the surface of the cavity. The rotating device includes a positioning mandrel, a rotating arm, a fixed shaft, and a connecting plate. One end of the positioning mandrel is perpendicularly connected and fixed to one end of the rotating arm, and the other end of the rotating arm is perpendicularly hinged and fixed to the end of the fixed shaft, allowing it to rotate around the fixed shaft. The positioning mandrel and the fixed shaft are axially parallel, forming a vertical Z-shaped structure. The axial center distance between the positioning mandrel and the fixed shaft is equal to the perpendicular distance between the axis of the torsion spring and the processing bending point. The outer diameter of the positioning mandrel is smaller than the inner diameter of the torsion spring, and it is clearance-fitted with the inserted torsion spring. The upper end of the connecting plate is connected and fixed to the side of the upper mold by bolts, and the other end is perpendicularly connected and fixed to the fixed shaft. The lower end of the connecting plate is connected to an L-shaped support arm. A stepped boss is provided on one side of the lower end of the connecting plate. The surface of the boss contacts the rotating arm support to limit the rotation range of the rotating arm, keeping the rotating arm horizontal in its free state. The extension axis of the support arm is parallel to the axis of the positioning mandrel and is located outside the lower mold, moving up and down with the connecting plate.

2. The torsion spring end torsion arm bending device according to claim 1, characterized in that: The lower die cavity has a concave groove that matches the torsion spring forming process, and the two wings of the concave groove transition to the steps of the platform structure; the positioning groove includes a lower die correction groove set in the middle of the concave groove in the transverse direction and an anti-slip groove set in the middle of the two wing steps in the transverse direction and connected to the lower die correction groove.

3. The torsion spring end torsion arm bending device according to claim 2, characterized in that: The connecting plate is connected and fixed to the side of the upper mold by a pad, which is used to adjust the distance between the connecting plate and the end face of the upper mold.

4. The torsion spring end torsion arm bending device according to claim 2, characterized in that: A retractable step is provided on one side of the upper die punch to avoid the torsion spring after bending.

5. The torsion spring end torsion arm bending device according to claim 2, characterized in that: An L-shaped support arm is provided on the other side of the lower end of the connecting plate to support the torsion arm at the end of the torsion spring and ensure that the standard torsion spring remains horizontal before bending.

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