Die, device and method for straight cutting of bent end of automobile spring piece

Abstract

The invention relates to an automobile leaf spring bent end straight cutting die, device and method, the automobile leaf spring bent end straight cutting die comprises an upper die and a lower die, the lower die is provided with a fixing block, the shape of the top surface of the fixing block is matched with that of a leaf spring with two bent ends, and cutting blocks are arranged on two sides of the fixing block. The cutting-off block is slidably connected with a sliding way arranged on the lower die, the sliding direction is perpendicular to tangent lines at the cutting positions of arc structures at the two ends of a to-be-cut spring piece, a cutting knife is arranged on the cutting side of the cutting-off block, the bottom face of the cutting-off block makes contact with the top face of the ejector rod, the ejector rod is slidably connected with the lower die, and an elastic piece is arranged between the ejector rod and the lower die. By the adoption of the die, the quality of a cut section is guaranteed, follow-up assembly is facilitated, and the production schedule is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile part processing, and particularly relates to a bending-end straight-cutting die, device and method for an automobile spring leaf. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Currently, the spring leaf of an automobile is in a plate-like structure, and arc structures are provided at both ends of the plate-like structure. Due to assembly requirements for this kind of automobile part, the cross-section of the arc structure needs to be perpendicular to the tangent line at the position of the cross-section of the arc structure. The existing cutting method is to cut out a perpendicular cross-section when the plate is in a flat state, and then perform a bending operation on both ends of the plate. When using this processing method, the cross-sections at both ends of the plate will be deformed during the bending process, affecting the flatness of the cross-section and the perpendicularity to the tangent line at the position of the arc cross-section, thereby affecting subsequent assembly and the production progress. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a bending-end straight-cutting die, device and method for an automobile spring leaf, which ensures the accuracy of the cross-section of the arc structure of the automobile spring leaf, and thus ensures the subsequent smooth assembly.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a bending-end straight-cutting die for an automobile spring leaf, including an upper die and a lower die. The lower die is provided with a fixed block, the top surface shape of the fixed block matches the shape of the spring leaf after being bent at both ends. Cutting blocks are provided on both sides of the fixed block. The cutting blocks are slidably connected to the slideways provided on the lower die, and the sliding direction is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring leaf to be cut. A cutting knife is provided on the cutting side of the cutting block. The bottom surface of the cutting block contacts the top surface of a top rod. The top rod is slidably connected to the lower die, and an elastic member is provided between the top rod and the lower die. The upper die is provided with a pressure rod corresponding to the cutting block.

[0007] Optionally, the cutting block is provided with a slider, and the slideway provided on the lower die is provided with a chute, and the extending direction of the chute is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring leaf to be cut.

[0008] Optionally, pull-back blocks are provided on both sides of the cutting block. Correspondingly, the upper die is provided with pull-back rods corresponding to the pull-back blocks. Hooks are provided at the bottom ends of the pull-back rods, and the hooks are provided with second mating surfaces corresponding to the first mating surfaces of the pull-back blocks.

[0009] Optionally, the first mating surface and the second mating surface are inclined surfaces that form a set acute angle with the vertical direction, so that when the return pull rod is lifted, the return pull block can be driven to rise along the sliding direction of the cutting block through the second mating surface and the first mating surface.

[0010] Optionally, a vertical channel is provided inside the lower die below the cutting block. The ejector rod is slidably connected to the vertical channel. An elastic member is provided between the bottom end of the ejector rod and the bottom surface of the vertical channel. The top end of the ejector rod is in sliding contact with the bottom surface of the cutting block.

[0011] Further, the ejector rod includes a top-pushing portion and a sliding portion. The top end of the top-pushing portion is in sliding contact with the bottom surface of the cutting block. The bottom end of the top-pushing portion is fixed to the top surface of the sliding portion. The sliding portion is slidably connected to the inner cylindrical surface of a sliding cylinder provided in the vertical channel. An elastic member is provided between the bottom surface of the sliding portion and the bottom surface of the vertical channel.

[0012] Optionally, the elastic member is a spring. One end of the spring is connected to the ejector rod, and the other end is connected to the bottom surface of the vertical channel.

[0013] Optionally, the cross-section of the cutting knife adopts a triangular structure, and a pointed structure is formed by enclosing a first knife surface and a second knife surface. The first knife surface is located above the second knife surface, and the first knife surface is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut.

[0014] Optionally, the fixing block includes a fixing portion and a supporting portion provided at the top of the fixing portion. The top surface of the supporting portion matches the shape of the spring piece to be cut. Both ends of the top surface of the supporting portion are connected to the top of the fixing portion through connection surfaces. The connection surfaces are parallel to the sliding direction of the cutting block. A space for accommodating the movement of the cutting block and the falling of cutting waste is provided between the fixing portion and the cutting block.

[0015] In a second aspect, an embodiment of the present invention provides an automobile spring piece straight cutting device, including the automobile spring piece bent end straight cutting die described in the first aspect, wherein the lower die is fixed to the workbench, and the upper die is connected to a lifting driving mechanism.

[0016] In a third aspect, an embodiment of the present invention provides a working method for the automobile spring piece straight cutting device described in the second aspect:

[0017] The upper surface of the fixing block supports a spring piece with arc structures pre-bent at both ends;

[0018] The lifting driving mechanism drives the upper die to move downward toward the lower die. After the pressing rod contacts the cutting block, the cutting block slides along the slideway. The sliding direction is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut. The arc structures at both ends of the spring piece are cut by using the cutting knife.

[0019] After cutting is completed, the lifting drive mechanism drives the upper die to move away from the lower die. Under the action of the elastic member, the cutting block slides along the slideway to reset.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. For the straight cutting die of the present invention, the upper surface of the fixed block matches the shape of the spring pieces with bent arcs at both ends, which can support the spring pieces with bent arcs at both ends. At the same time, the cutting block is slidably connected to the slideway provided on the lower die, and the upper die is provided with a pressure rod corresponding to the position of the cutting block. After the pressure rod moves downward, the pressure rod can drive the cutting block to slide along the slideway, and the sliding direction is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece, thereby ensuring that the cutting section is perpendicular to the tangent line at the cutting position, enabling the spring piece to first form arc mechanisms at both ends during processing and then perform cutting, avoiding the influence of the end bending of the spring piece on the cutting section, ensuring the quality and precision of the cut section, avoiding the deformation of the section caused by first cutting and then bending the arc structure, which affects the subsequent assembly of the spring piece, and ensuring the production progress.

[0022] 2. For the straight cutting die of the present invention, there is a certain space between the fixed block and the cutting block. This space provides, on the one hand, a space allowing the cutting tool to move, and on the other hand, a space for the waste to fall, enabling the waste after cutting to fall along this space, facilitating the collection of the waste.

[0023] 3. For the straight cutting die of the present invention, a pulling-back block and a pulling-back rod are provided, which can drive the cutting block to slide upward along the slideway by means of the pulling-back rod, avoiding the problem that the waste jams the cutting block and prevents the cutting block from resetting due to insufficient elasticity of the elastic member. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0025] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention Figure 1 ;

[0026] Figure 2 is a schematic diagram of the overall structure of Embodiment 1 of the present invention Figure 2 ;

[0027] Figure 3 is a schematic diagram of the lower die of Embodiment 1 of the present invention;

[0028] Figure 4 is a schematic diagram of the upper die of Embodiment 1 of the present invention;

[0029] Figure 5 is a sectional view of the lower die of Embodiment 1 of the present invention;

[0030] Figure 6 Schematic diagram of the cooperation between the fixing block and the cutting block in Embodiment 1 of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the cutting block in Embodiment 1 of the present invention;

[0032] Figure 8 Schematic diagram of the structure of the slideway in Embodiment 1 of the present invention;

[0033] Figure 9 Schematic diagram of the structure of the return pull rod in Embodiment 1 of the present invention;

[0034] Among them, 1. upper die, 2. lower die, 3. fixing block, 4. spring piece, 5. cutting block, 6. slideway, 7. cutting knife, 8. space, 9. pushing part, 10. sliding part, 11. sliding cylinder, 12. pressing rod, 13. return pull rod, 14. limiting cylinder;

[0035] 5-1. slider, 5-2. return pull block, 5-3. first mating surface;

[0036] 6-1. chute;

[0037] 7-1. first cutting surface, 7-2. second cutting surface;

[0038] 13-1. hook, 13-2. second mating surface. Specific implementation manner

[0039] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate the same upper and lower directions as those of the attached drawings themselves, and do not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0040] In this embodiment, the bent end of the spring piece refers to the arc-shaped structure at the end of the spring piece.

[0041] Embodiment 1

[0042] This embodiment provides an automotive spring piece bent end straight cutting die, as Figures 1 - 4 shown, including an upper die 1 and a lower die 2. The upper die 1 is located directly above the lower die 2, and the upper die 1 can move vertically towards or away from the lower die 2.

[0043] As Figures 5 - 6As shown, the lower die 2 is provided with a fixing block 3. The shape of the top surface of the fixing block 3 matches the shape of the spring piece 4 after being bent at both ends. The spring piece 4 after being bent at both ends includes a straight plate structure and arc structures located at both ends of the straight plate structure. Therefore, the top surface of the fixing block 3 includes a plane matching the straight plate structure and arc surfaces located at both ends of the plane and matching the arc structures.

[0044] The top surface of the fixing block 3 is used to cooperate with the spring piece 4 after being bent at both ends to support the spring piece 4 after being bent at both ends.

[0045] Cutting blocks 5 are provided on both sides of the fixing block 3. The structures of the cutting blocks 5 on both sides are exactly the same and are symmetrically arranged.

[0046] As Figures 7 - 8 shown, the cutting block 5 is slidably connected to the slideway 6 provided on the lower die 2, and the sliding direction is perpendicular to the tangent line at the cutting position of the arc structure. The side of the cutting block close to the fixing block 3 is the cutting side, and a cutting knife 7 is provided on the cutting side. The width of the cutting knife 7 is greater than the width of the spring piece. The cutting knife 7 can move along the sliding direction with the cutting block 5, so as to cut the arc structures on both sides of the spring piece 4. Since the sliding direction is perpendicular to the tangent line direction at the cutting position, the cut section is perpendicular to the tangent line at the section position.

[0047] In this embodiment, the slideway 6 is embedded and installed in the installation groove provided on the lower die. The slideway 6 is fixedly connected to the lower die through bolts. The slideway is provided with a chute 6-1, and the extending direction of the chute 6-1 is perpendicular to the tangent line direction at the cutting position. Correspondingly, the cutting block 5 is provided with a slider 5-1, and the slider 5-1 is embedded in the chute 6-1 and is slidably connected to the chute 6-1. The sliding connection between the cutting block 5 and the slideway 6 is realized through the cooperation of the slider 5-1 and the chute 6-1.

[0048] The cutting knife 7 adopts a triangular structure, and its tip is formed by a first knife surface 7-1 and a second knife surface 7-2 that intersect. The first knife surface 7-1 is located above the second knife surface 7-2. Among them, the first knife surface 7-1 is parallel to the sliding direction, and the cross section of the arc structure is cut out through the first knife surface 7-1.

[0049] Further, in order to ensure the quality and accuracy of the cut section, the fixing block 3 includes a fixing part 3-1 and a supporting part 3-2 located at the top of the fixing part. The fixing part 3-1 is fixedly connected to the lower die 2 through bolts. The shape of the top surface of the supporting part 3-2 matches the shape of the spring piece 4 after being bent at both ends. Both side edges of the top surface of the supporting part 3-2 are connected to the top edge of the fixing part 3-1 through connection surfaces. The connection surfaces are flush with the sliding direction of the cutting block 5, and the connection surfaces and the first knife surface 7-1 are located in the same plane parallel to the sliding direction.

[0050] With this setting method, after the cutting knife 7 cuts off the arc structures at both ends of the spring piece 4, the first cutting surface 7-1 can slide along the connecting surface, and the first cutting surface 7-1, the connecting surface, and the cutting section are located in the same plane, ensuring the cutting quality and accuracy of the section.

[0051] Furthermore, the width of the fixing portion 3-1 is such that there is a set space 8 between the fixing portion and the cutting blocks 5 on both sides thereof. This space 8 allows the movement of the cutting blocks 5 and the cutting knife 7, such that the movement of the cutting blocks 5 and the cutting knife 7 will not interfere with or collide with the fixing block 3. On the other hand, due to the existence of this space 8, the waste material after cutting can fall within this space 8 under its own gravity. The lower die 2 is provided with a blanking channel extending to the bottom surface and communicating with this space, and the waste material can fall into the blanking channel through this space, continue to fall along the blanking channel and fall out, facilitating the centralized collection of the waste material.

[0052] The bottom surface of the cutting block 5 is in sliding contact with the top surface of the ejector rod. The ejector rod is arranged in the vertical channel opened in the lower die 2 and is slidably connected to the lower die 2, and the ejector rod can perform vertical movement along its own axis direction.

[0053] An elastic member is provided between the bottom end of the ejector rod and the bottom surface of the vertical channel, and the elastic member is used to reset the cutting block.

[0054] Specifically, the ejector rod includes a pushing portion 9 and a sliding portion 10. The bottom end of the pushing portion 9 is vertically connected to the central position of the sliding portion 10. The pushing portion 9 and the sliding portion 10 are coaxially arranged. The diameter of the sliding portion 10 is larger than the diameter of the pushing portion. The top end of the pushing portion 9 is in sliding contact with the bottom surface of the cutting block 5. The sliding portion 10 is slidably connected to the inner cylindrical surface of the sliding cylinder 11. The sliding cylinder 11 is fixed inside the vertical channel and is coaxially arranged with the vertical channel. An elastic member is provided between the bottom surface of the sliding portion 10 and the bottom surface of the vertical channel.

[0055] Furthermore, a limiting cylinder 14 fixed inside the vertical channel is provided below the sliding cylinder 11. The top end of the limiting cylinder 14 can contact the bottom surface of the sliding portion 10 to limit the downward movement of the cutting block 5.

[0056] In another embodiment, the diameter of the sliding portion 10 is smaller than the diameter of the pushing portion 9. The sliding portion 10 is slidably connected to the sliding cylinder 11. An elastic member is provided between the bottom surface of the sliding portion 10 and the bottom surface of the vertical channel. The pushing portion 9 can contact the top surface of the sliding cylinder 11 to limit the downward movement of the cutting block 5.

[0057] In this embodiment, the elastic member adopts a spring (not shown in the figure). The bottom end of the spring is fixedly connected to the bottom surface of the vertical channel, and the top end of the spring is fixedly connected to the bottom surface of the sliding portion 10.

[0058] In the natural state, the spring can use its elastic force to push the ejector rod upward, thereby realizing the reset of the cutting block 5.

[0059] The upper die 1 is provided with pressure rods 12, and the pressure rods 12 correspond to the cutting blocks 5. Since there are two cutting blocks 5, there are also two pressure rods 12, and each pressure rod 12 corresponds to one cutting block 5.

[0060] The upper die 1 drives the pressure rod 12 to move downward. The pressure rod 12 can apply a vertical downward pressure to the cutting block 5, and the cutting block 5 slides down along the chute 6-1. At this time, the cutting knife 7 can cut the arc structure at the end of the automotive spring leaf 4.

[0061] After cutting is completed, the pressure rod 12 moves upward under the drive of the upper die 1, and the pressure rod 12 is separated from the cutting block 5. Under the action of the spring, the cutting block 5 moves upward along the chute 6-1, and the cutting block 5 is reset.

[0062] Furthermore, in order to enable the cutting block 5 to be reset more smoothly, pull-back blocks 5-2 are provided on both sides of the cutting block 5. Correspondingly, the upper die 1 is provided with pull-back rods 13 corresponding to the pull-back blocks. The length of the pull-back rod 13 is greater than the length of the pressure rod 12 so that the bottom end of the pull-back rod 13 is located below the bottom end of the pull rod 12.

[0063] Since pull-back blocks 5-2 are provided on both sides of the cutting block 5, one cutting block 5 corresponds to two pull-back rods 13 fixed to the upper die.

[0064] As Figure 9 shown, a hook 13-1 is provided at the bottom end of the inner side surface of the pull-back rod 13. The hook 13-1 is provided with a second mating surface 13-2 that is inclined at a set acute angle with respect to the vertical direction. The second mating surface 13-2 is used to cooperate with the pull-back block 5-2. The side surface of the pull-back block 5-2 close to the fixed block 3 is divided into two parts in the vertical direction. The upper half part is a vertical plane, and the lower half part is a first mating surface 5-3 that matches the second mating surface. The first mating surface 5-3 is inclined at a set acute angle with respect to the vertical direction and can be in surface contact with the second mating surface 13-2.

[0065] In this embodiment, when the upper die 1 moves downward, the pull-back rod 13 first enters the installation groove of the chute 6. As the upper die 1 continues to move downward, after the pressure rod 12 contacts the cutting block 5, it drives the cutting block 5 to slide downward along the chute 6-1 and toward the fixed block 3. The arc structure at the end of the spring leaf 4 is cut by the cutting knife 7. When the cutting block 5 moves downward to the target position, the second mating surface 13-2 of the hook 13-1 of the pull-back rod 13 is in surface contact with the first mating surface 5-3 of the pull-back block 5-2.

[0066] The upper die 1 moves upward, and the return pull rod 13 also moves upward. Under the combined action of the hook 13-1 and the elastic force of the spring, the cutting block 5 is driven to rise and reset. At this time, the cutting work of the arc structure of the spring piece 4 is completed.

[0067] By providing the return pull block 5-2 and the return pull rod 13, the return pull rod 13 can be used to drive the cutting block 5 to slide upward along the slideway 6, avoiding the problem that the waste material gets stuck in the cutting block 5 due to insufficient elasticity of the elastic member, resulting in the inability to reset the cutting block.

[0068] For the remaining structures of the upper die 1 and the lower die 2, the existing technology can be adopted and will not be described in detail here.

[0069] Embodiment 2

[0070] This embodiment provides a device for straight-cutting the bent ends of automotive spring pieces, including the die for straight-cutting the bent ends of automotive spring pieces described in Embodiment 1. Among them, the lower die 2 is fixedly arranged on the workbench, and the upper die 1 is connected to the lifting drive mechanism. The lifting drive mechanism can drive the upper die 1 to lift and lower. The lifting drive mechanism can adopt the existing lifting drive mechanism of the automotive spring piece straight-cutting device and will not be described in detail here. For the remaining structures of the straight-cutting device, the existing technology can be adopted and will not be described in detail here.

[0071] Embodiment 3

[0072] This embodiment provides a working method for the device for straight-cutting the bent ends of automotive spring pieces described in Embodiment 2, including the following steps:

[0073] Step 1: First, bend the two ends of the spring piece 4 to form an arc structure. The bending method can adopt the existing technology and will not be described in detail here.

[0074] Step 2: Place the spring piece 4 with bent ends on the top surface of the fixing block 3 and use the fixing block 3 for support.

[0075] Step 3: The lifting drive mechanism drives the upper die 1 to move downward. The return pull rod 13 first enters the installation groove of the lower die 2. The upper die 1 continues to move downward until the pressure rod 12 contacts the top surface of the cutting block 5. The upper die 1 continues to move downward. The cutting block 5 slides along the chute 6-1, and the cutting knife 7 cuts the arc structure at the end of the spring piece 4. The cut waste material falls along the space 8 between the fixing portion 3-1 and the cutting block 5. When the cutting block 5 moves to the lower limit position, the second mating surface 13-2 of the hook of the return pull rod 13 fits with the first mating surface 5-3 of the return pull block 5-2.

[0076] Step 4: After the cutting is completed, the lifting drive mechanism drives the upper die to move upward. Under the action of the elastic force of the spring and the hook 13-1, the cutting block 5 slides upward along the chute 6-1. After the pressure rod 12 is separated from the cutting block 5, the cutting block 5 resets. At this time, the cutting work of a spring piece 4 is completed.

[0077] For the straight cutting device and working method of this embodiment, when processing the spring piece 4, the arc mechanisms can be bent at both ends first, and then cutting is performed, which avoids the influence of the end bending of the spring piece 4 on the cutting section, ensures the quality and accuracy of the cut section, avoids the deformation of the section caused by bending the arc structure after cutting first, which affects the subsequent assembly of the spring piece, and ensures the production progress.

[0078] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automotive leaf spring bent end straight cutting die, comprising an upper die and a lower die, characterized in that, The lower die is provided with a fixed block, the top surface shape of the fixed block matches the shape of the spring piece after being bent at both ends, cutting blocks are arranged on both sides of the fixed block, the cutting blocks are slidably connected to the slideways arranged on the lower die and the sliding direction is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut, a cutting knife is arranged on the cutting side of the cutting block, the bottom surface of the cutting block contacts the top surface of the ejector rod, the ejector rod is slidably connected to the lower die and an elastic member is arranged between the ejector rod and the lower die, and the upper die is provided with a pressing rod corresponding to the cutting block.

2. The automotive spring plate bent end straight cutting die according to claim 1, wherein The cutting block is provided with a slider, and the slideway arranged on the lower die is provided with a chute, and the extending direction of the chute is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut.

3. A bending end straight cutting die for an automotive spring leaf, characterized in that Pull-back blocks are arranged on both sides of the cutting block, correspondingly, the upper die is provided with pull-back rods corresponding to the pull-back blocks, hooks are arranged at the bottom ends of the pull-back rods, and the hooks are provided with second mating surfaces corresponding to the first mating surfaces of the pull-back blocks.

4. The automotive spring leaf bent-end straight cutting die according to claim 3, characterized in that, The first mating surface and the second mating surface adopt inclined surfaces that form a set acute angle with the vertical direction so that when the pull-back rod is lifted, the pull-back block can be driven to rise along the sliding direction of the cutting block through the second mating surface and the first mating surface.

5. The bending-end straight-cutting die for an automotive spring plate according to claim 1, wherein A vertical channel arranged inside the lower die is provided below the cutting block, the ejector rod is slidably connected to the vertical channel, an elastic member is arranged between the bottom end of the ejector rod and the bottom surface of the vertical channel, and the top end of the ejector rod is in sliding contact with the bottom surface of the cutting block; Further, the ejector rod includes a top-pushing portion and a sliding portion, the top end of the top-pushing portion is in sliding contact with the bottom surface of the cutting block, the bottom end of the top-pushing portion is fixed to the top surface of the sliding portion, the sliding portion is slidably connected to the inner cylindrical surface of a sliding cylinder arranged in the vertical channel, and an elastic member is arranged between the bottom surface of the sliding portion and the bottom surface of the vertical channel.

6. The bending end straight cutting die for an automotive spring plate according to claim 5, characterized in that The elastic member adopts a spring, one end of the spring is connected to the ejector rod, and the other end is connected to the bottom surface of the vertical channel.

7. The automotive spring leaf bent end straight cutting die according to claim 1, characterized in that, The cross-section of the cutting knife adopts a triangular structure, and a pointed structure is formed by enclosing a first knife surface and a second knife surface, wherein the first knife surface is located above the second knife surface, and the first knife surface is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut.

8. The automotive spring leaf bent-end straight cutting die according to claim 1, wherein, The fixed block includes a fixed portion and a supporting portion arranged on the top of the fixed portion, the top surface of the supporting portion matches the shape of the spring piece to be cut, both ends of the top surface of the supporting portion are connected to the top of the fixed portion through connecting surfaces, the connecting surfaces are parallel to the sliding direction of the cutting block, and a space for accommodating the movement of the cutting block and the falling of cutting waste is arranged between the fixed portion and the cutting block.

9. An automotive leaf spring straight cutting device, characterized in that, It includes a bending-end straight-cut die for automotive spring pieces according to any one of claims 1-8, wherein the lower die is fixed to the workbench, and the upper die is connected to a lifting driving mechanism.

10. A working method of an automotive spring piece straight-cutting device according to claim 9, characterized in that: The upper surface of the fixed block supports a spring piece with arc structures pre-bent at both ends; The lifting driving mechanism drives the upper die to move downward towards the lower die. After the pressing rod contacts the cutting block, the cutting block slides along the slideway, and the sliding direction is perpendicular to the tangent line at the cutting position of the arc structures at both ends of the spring piece to be cut, and the arc structures at both ends of the spring piece are cut by using the cutting knife; After cutting is completed, the lifting driving mechanism drives the upper die to move away from the lower die, and under the action of the elastic member, the cutting block slides along the slideway to reset.

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