Bending die and bending machine

Abstract

The utility model relates to the technical field of stainless steel bending dies, in particular to a bending die and a bending machine, the bending die comprises a male die and a female die assembly, the female die assembly comprises a female die base, a spring and two sets of L-shaped swing pieces, the two sets of swing pieces are arranged in a mirror image mode, the swing pieces and the female die base are assembled in a rotating mode, and the spring is arranged on the female die base. The two ends of the spring are connected to the female die base and the swing pieces correspondingly, the spring is used for pulling the two swing pieces to move oppositely, the connecting position of the spring and the swing pieces is located above the rotating center of the swing pieces, and when the male die abuts against the female die assembly, the two swing pieces move oppositely to form a bending space. Through movable assembly of the swing part and the female die base, hard friction between the sheet metal part and the female die is reduced, so that the risk that the surface of the sheet metal part is scratched is reduced, the material taking time is shortened, the production efficiency is improved, meanwhile, the risk of secondary damage to the surface quality when the bent sheet metal part is taken out is reduced, and the appearance and quality of a bent part are kept.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel bending dies, in particular to a bending die and a bending machine. Background Art

[0002] A bending machine is a metal processing machine that is mainly used to bend sheet metal parts and other metal plates into various shapes to meet the needs of different industrial production and construction fields. In particular, in the manufacture of U-shaped parts, bending machines play a vital role;

[0003] The bending machine mold in the prior art is mainly composed of a concave die and a convex die. During the bending process, the concave die is fixed, while the convex die moves toward the concave die. When the convex die contacts the sheet metal part, it will exert pressure on the sheet metal part, causing it to move toward the inner wall of the concave die, resulting in plastic deformation, thereby bending the sheet metal part into the required U shape. This bending method has the advantages of simple structure and convenient operation, and can meet most bending needs.

[0004] However, with respect to the above-mentioned related technologies, the inventors believe that the bending mold has the following defects. First, since the die is fixed, hard friction will be generated when the sheet metal comes into contact with the die. This friction can easily cause scratches on the surface of the sheet metal, especially when bending polished stainless steel sheets, which will affect its surface quality; secondly, the sheet metal is subjected to pressure and plastic deformation during the bending process, causing it to cling to the inner wall of the die. The fitting state will increase the friction between the sheet metal and the die, making it necessary to overcome greater resistance when removing the sheet metal. Since the die is fixed, it is more difficult to remove the bent sheet metal from the die, affecting production efficiency. There is also a risk of secondary damage to the surface quality of the sheet metal. Utility Model Content

[0005] In order to solve the problem of surface scratches and inconvenience in material cutting caused by hard friction between the mold and the sheet metal part during bending due to the fixed setting of the concave mold of the bending mold in the prior art, the present application provides a bending mold and a bending machine.

[0006] The utility model provides a bending die and a bending machine adopting the following technical solutions:

[0007] In the first aspect, a bending die is provided, which adopts the following technical solution:

[0008] A bending mold comprises a punch and a die assembly, wherein the die assembly comprises a die seat, a spring, and two groups of swinging parts arranged in an L shape, wherein the two groups of swinging parts are arranged in a mirror image of each other, and the swinging parts are rotatably assembled with the die seat, and the two ends of the spring are respectively connected to the die seat and the swinging parts, and the spring is used to pull the two groups of swinging parts to move away from each other, and the connection between the spring and the swinging parts is located above the rotation center of the swinging parts, and when the punch and the die assembly are in contact, the two groups of swinging parts move toward each other to form a bending space.

[0009] Preferably, the die seat is provided with a placement groove for accommodating two groups of the swinging members, and when the male die and the female die assembly are in abutment, the outer bottom surface of the swinging member is in abutment with the bottom wall of the placement groove.

[0010] Preferably, an arc-shaped transition surface is provided at the intersection of the side wall of the placement groove and the die seat, and an arc-shaped portion is provided at the intersection of the outer side wall and the outer bottom wall of the swinging member, and the arc-shaped portion slides on the transition surface.

[0011] Preferably, a side wall of any group of the swing members facing the other group of the swing members is provided with an avoidance portion, and the avoidance portion is gradually inclined from top to bottom and toward the inner side of the swing member.

[0012] Preferably, the die assembly further comprises a limit plate, which is assembled with the die seat and covers the transverse end surface of the placement groove.

[0013] Preferably, the die assembly further comprises a baffle plate assembled with the die seat, wherein the baffle plate is located on one side of the two sets of swinging members and above the limit plate, and a feeding channel is formed between the side wall of the baffle plate and the side wall of the die seat.

[0014] Preferably, a first arc surface is provided at the connection between the inner bottom wall of the swinging member and the avoidance portion, and a second arc surface is provided at the connection between the inner side wall of the swinging member and the top wall of the swinging member. When the spring is in a reset state, the tangent of the first arc surface and the tangent of the second arc surface are arranged colinearly and parallel to the bottom surface of the placement groove.

[0015] Preferably, the baffle is provided with a connecting hole along the longitudinal direction, and when the spring is in a reset state, the first arc surface is located in the connecting hole.

[0016] Preferably, the spring is a torsion spring, one hook of the torsion spring is connected to the side wall of the die seat by screws, and the other hook of the torsion spring is connected to the side wall of the swinging member by screws.

[0017] In the second aspect, a bending machine is provided, which adopts the following technical solution:

[0018] A bending machine includes a machine base and a cylinder, and also includes the above-mentioned bending mold, the die assembly is installed on the machine base and the bending space is arranged upward, the fixed end of the cylinder is connected to the machine base, the movable end of the cylinder is connected to the punch, and the punch is located directly above the die assembly and moves back and forth toward the swinging member.

[0019] The beneficial effects of the utility model are:

[0020] Through the movable assembly of the swinging part and the die seat, when the punch moves down, the convex surface presses down the sheet metal part, and the sheet metal part is squeezed into the two sets of swinging parts. At the same time, the punch overcomes the elastic force of the spring, so that the two sets of swinging parts 2 are close to each other to form a bending space, and the inner wall of the swinging part squeezes the sheet metal part, so that the straight sheet metal part is bent into a U-shaped bending part. After the bending is completed, the punch moves up and away from the die assembly, and the spring pulls the swinging part to reset, and the two sets of swinging parts move back to back. At the same time, the bottom wall of the swinging part set in an L shape lifts the U-shaped bending part, which is convenient for taking the U-shaped bending part out of the die assembly, reducing the hard friction between the sheet metal part and the die, thereby reducing the risk of scratching the surface of the sheet metal part. It is especially suitable for bending materials with high surface requirements such as polished stainless steel sheets.

[0021] Secondly, the design of the swing part makes it easier to remove the bent sheet metal parts from the die assembly, reducing the material removal time and improving production efficiency. At the same time, it reduces the risk of secondary damage to the surface quality when removing the bent sheet metal parts, maintaining the appearance and quality of the bent parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a stereogram of Example 1 of the present application;

[0023] Figure 2 is a top view of Example 1 of the present application;

[0024] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0025] Figure 4 is a disassembled stereogram of Example 1 of the present application;

[0026] Figure 5 is a schematic diagram of the spring in Example 1 of the present application in a reset state;

[0027] Figure 6 is a schematic diagram of the spring in Example 1 of the present application in a stretched state;

[0028] Figure 7 It is a front view of the die base in Example 1 of the present application;

[0029] Figure 8is a three-dimensional diagram of the swing member in Example 1 of the present application;

[0030] Fig. 9 is a cross-sectional view of the swing member in Example 2 of the present application;

[0031] Fig.10 It is a stereoscopic diagram in Example 3 of the present application.

[0032] Explanation of the reference numerals in the accompanying drawings: 1. Punch; 2. Die assembly; 201. Die seat; 2011. Placement groove; 2012. Transition surface; 202. Spring; 203. Swinging piece; 2031. Bending space; 2032. Arc portion; 2033. Needle roller; 2034. Avoidance portion; 2035. First arc surface; 2036. Second arc surface; 2037. Protective layer; 204. Limiting plate; 205. Baffle; 2051. Connecting hole; 206. Rotating shaft; 2052. Lug; 3. Machine base; 4. Cylinder. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that each technical feature and the overall technical solution of the utility model can be understood intuitively and vividly, but it cannot be understood as a limitation on the protection scope of the utility model.

[0034] In the description of the present invention, if there is a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0035] In the description of the present invention, if the orientation description is involved, for example, the orientation or position relationship indicated by "horizontal", "longitudinal" or "vertical" is based on the attached Figure 1 In the orientation or position relationship shown, the X-axis represents the horizontal direction, the Y-axis represents the longitudinal direction, and the Z-axis represents the vertical direction.

[0036] In the description of the present utility model, if "several" is involved, it means one or more, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In addition, unless otherwise defined, the technical terms and scientific terms used in the present invention have the same meanings as those generally understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, not for limiting the present invention. It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0038] Example 1: Figure 1-8As shown, a bending mold includes a male mold 1 and a female mold assembly 2. The female mold assembly 2 includes a female mold base 201, a spring 202, and two groups of swinging members 203 arranged in an L shape. The two groups of swinging members 203 are arranged in mirror images of each other. The swinging members 203 are rotatably assembled with the female mold base 201. The two ends of the spring 202 are respectively connected to the female mold base 201 and the swinging members 203. The spring 202 is used to pull the two groups of swinging members 203 to move in opposite directions. The connection between the spring 202 and the swinging member 203 is located above the rotation center of the swinging member 203. When the punch 1 is in contact with the die assembly 2, the two sets of swinging members 203 move toward each other to form a bending space 2031. The swinging members 203 and the die seat 201 are assembled flexibly so that the shape of the bending space 2031 can be flexibly changed. When bending, a straight sheet metal part is placed on the two sets of swinging members 203. The two sets of swinging members 203 support the sheet metal part symmetrically at two locations on the left and right. Since the two sets of swinging members 203 are mirror images of each other and have the same structure, the supported sheet metal parts are in a horizontal arrangement. When the punch 1 moves down, the punch 1 moves downward, and the punch 1 moves downward. The sheet metal part is pressed downwardly by the punch 1 to be squeezed into the two sets of swinging parts 203. At the same time, the punch 1 overcomes the elastic force of the spring 202, so that the two sets of swinging parts 203 are close to each other to form a bending space 2031. The inner wall of the swinging part 203 squeezes the sheet metal part, so that the straight sheet metal part is bent into a U-shaped bending part. After the bending is completed, the punch 1 moves up and away from the die assembly 2. The spring 202 pulls the swinging part 203 to reset. The two sets of swinging parts 203 move back to back. At the same time, the bottom wall of the L-shaped swinging part 203 presses the U-shaped bending part. The bent part is lifted, which makes it easier to remove the U-shaped bent part from the die assembly 2, reducing the hard friction between the sheet metal part and the die, thereby reducing the risk of scratching the surface of the sheet metal part. It is particularly suitable for bending materials with high surface requirements such as polished stainless steel sheets. Secondly, the design of the swing part 203 makes it easier to remove the bent sheet metal part from the die assembly 2, reducing the material removal time and improving production efficiency. At the same time, it reduces the risk of secondary damage to the surface quality when removing the bent sheet metal part, thereby maintaining the appearance and quality of the product.

[0039] It should be noted that the rotation center of the swinging member 203 refers to the rotational assembly position of the swinging member 203 and the die holder 201 , and the punch 1 is arranged in an inverted T shape and is adapted to the bending space 2031 .

[0040] It is worth mentioning that since the swing member 203 is arranged in an L shape, the inner wall of the swing member 203 refers to a side wall forming the bending space 2031, the outer wall of the swing member 203 refers to the other side wall away from the bending space 2031, the swinging inner bottom wall refers to a bottom wall forming the bending space 2031, and the outer wall of the swing member 203 refers to the other bottom wall away from the bending space 2031.

[0041] In order to improve the accuracy of the swinging of the swinging member 203, the swinging of the swinging member 203 is restricted. At the same time, when the two groups of swinging members 203 move toward each other to form a bending space 2031, the swinging member 203 is supported to improve the bending effect. The die seat 201 is provided with a placement groove 2011 for accommodating the two groups of swinging members 203. When the punch 1 abuts against the die assembly 2, the outer bottom surface of the swinging member 203 abuts against the bottom wall of the placement groove 2011. The bottom wall of the placement groove 2011 is arranged parallel to the bottom wall of the punch 1. When the punch 1 abuts against the die assembly 2, the bending The bottom surface of the space 2031 is arranged parallel to the bottom wall of the placement groove 2011, so as to ensure the bending quality. By setting the placement groove 2011 on the die seat 201, the bottom surface of the swing member 203 abuts against the bottom surface of the placement groove 2011, providing stable support, reducing shaking and deviation during the bending process, ensuring the precise positioning of the swing member 203 during the bending process, thereby improving the bending accuracy. Secondly, since the bottom surface of the bending space 2031 is arranged parallel to the bottom surface of the punch 1, it is ensured that the sheet metal is evenly stressed during the bending process, thereby improving the quality of the bent parts.

[0042] In order to improve the smoothness of the rotation of the swing member 203 and to increase the contact area between the swing member 203 and the inner side wall of the placement groove 2011, an arc-shaped transition surface 2012 is provided at the intersection of the side wall of the placement groove 2011 and the die seat 201, and an arc-shaped portion 2032 is provided at the intersection of the outer side wall of the swing member 203 and the outer bottom wall, and the arc-shaped portion 2032 slides on the transition surface 2012. By providing an arc-shaped transition surface 2012 at the intersection of the side wall of the placement groove 2011 and the die seat 201, and providing an arc-shaped portion 2032 at the intersection of the outer side wall of the swing member 203 and the outer bottom wall, the swing member 203 can rotate more smoothly, reducing friction and resistance during the rotation process. Secondly, the design of the arc-shaped portion 2032 and the transition surface 2012 increases the contact area between the swing member 203 and the inner side wall of the placement groove 2011, thereby dispersing pressure, reducing local wear, improving the overall durability of the mold, and extending the service life of the mold.

[0043] In order to avoid interference between the two groups of swing members 203 when they move toward and / or away from each other, a sidewall of any group of swing members 203 facing the other group of swing members 203 is provided with a relief portion 2034, which is gradually inclined from top to bottom and toward the inner side of the swing members 203. When the male mold 1 abuts against the female mold assembly 2, a relief space is formed between the relief portion 2034 of one group of swing members 203 and the relief portion 2034 of the other group of swing members 203, and the width of the relief space toward the lower end is greater than the width toward the upper end. By providing the relief space between the two groups of swing members 203, it is ensured that there is no interference between the swing members 203 when they move toward and / or away from each other, collision and damage of mechanical parts are avoided, and the smooth progress of the bending process is ensured.

[0044] When the punch 1 is in contact with the die assembly 2, the angle between the avoidance portion 2034 of one set of swing members 203 and the avoidance portion 2034 of the other set of swing members 203 is 15° to 20°, preferably 17°, and the bisector of the angle coincides with the mirror axis of the two sets of swing members 203.

[0045] In order to improve the shape of the sheet metal after bending, the inner wall of the L-shaped swing member 203 is tilted toward the bending space 2031, and the angle between the inner wall of the swing member 203 and the inner bottom wall of the swing member 203 is 86°±3°, preferably 86°.

[0046] In order to improve the convenience of disassembly and assembly of the swinging member 203 and facilitate the maintenance and replacement of the swinging member 203, that is, it is necessary to facilitate the disassembly of the swinging member 203 from the die seat 201, the die assembly 2 also includes a limit plate 204, the limit plate 204 is screwed to the die seat 201 and is covered on the lateral end face of the placement groove 2011, the limit plate 204 is removed from the die seat 201 through the detachable limit plate 204, and the swinging member 203 can be taken out from the die seat 201, which is convenient for the replacement and maintenance of the swinging member 203, or by replacing swinging members 203 of different specifications and the corresponding punches 1, the bending processing of sheet metal parts of different specifications can be realized, the compatibility of the bending mold is improved, so that it can cope with diversified production needs, simplify the maintenance and replacement process of the swinging member 203, reduce maintenance time, and improve production efficiency.

[0047] In order to save processing materials of the limiting plate 204 and reduce processing costs, the top wall of the limiting plate 204 is high in the middle and low on both sides, and the limiting plate 204 at the high middle position is arranged corresponding to the placement groove 2011.

[0048] In order to improve the stability of the sheet metal when it is placed on the two sets of swinging members 203 to be bent and facilitate loading, the die assembly 2 also includes a baffle 205 assembled with the die seat 201. The baffle 205 is located on one side of the two sets of swinging members 203 and above the limit plate 204. A loading channel is formed between the side wall of the baffle 205 and the side wall of the die seat 201. It should be noted that the top wall of the baffle 205 is located above the top wall of the swinging member 203. The sheet metal is placed on the loading channel. At this time, the spring 202 is in a reset state, and the swinging member 203 is in a V-shaped shape with its opening facing upward. The bottom surface of the sheet metal is in contact with the two groups of swinging members 203. The two groups of swinging members 203 support the sheet metal. Since the baffle 205 is located on one side of the two groups of swinging members 203, it plays a lateral limiting role for the sheet metal placed on the swinging members 203. When the punch 1 moves toward the die assembly 2, the sheet metal is pushed by the punch 1 and squeezed into the bending space 2031 to form a bent part.

[0049] Furthermore, the baffle 205 includes two groups of lugs 2052, which are used to be screwed to the die base 201. The two groups of lugs 2052 are located on both sides of the longitudinal direction of the baffle 205, and the two groups of lugs 2052 are located on the left and right sides of the feeding channel, thereby playing a longitudinal limiting role on the sheet metal parts of the feeding channel, reducing the lateral or longitudinal displacement of the sheet metal parts during the pressure process, improving the bending accuracy of the sheet metal parts, and improving the bending quality of the sheet metal parts.

[0050] In order to improve the supporting stability of the swing member 203 on the sheet metal part, a first arc surface 2035 is provided at the connection between the inner bottom wall of the swing member 203 and the avoidance portion 2034, and a second arc surface 2036 is provided at the connection between the inner side wall of the swing member 203 and the top wall of the swing member 203. When the spring 202 is in the reset state, the tangent of the first arc surface 2035 and the tangent of the second arc surface 2036 are collinearly arranged and parallel to the bottom surface of the placement groove 2011. Preferably, the tangent of the first arc surface 2035 and the tangent of the second arc surface 2036 of the two groups of swing members 203 are collinearly arranged. The first arc surface 2035 and the second arc surface 2036 are used to support the sheet metal in four directions, so that the swinging member 203 can provide more stable support for the sheet metal in the reset state, thereby enhancing the stability of the sheet metal during the bending process. Secondly, with the stable support of the baffle 205, the movement and deflection of the sheet metal during the bending process are reduced, the accuracy and dimensional consistency of the bent parts are improved, and the high-precision bending requirements are met. Secondly, by providing uniform support, the first arc surface 2035 and the second arc surface 2036 help to reduce stress concentration during the bending process, improve the surface quality of the bent parts, and reduce bending defects.

[0051] After the baffle plate 205 is provided, the difficulty of removing the bent part from the die assembly 2 will be increased to a certain extent. Because of the blocking effect of the baffle plate 205, in order to reduce the influence of the baffle plate 205 on material removal and to ensure that the baffle plate 205 has a limiting effect on the sheet metal part, the baffle plate 205 is provided with a connecting hole 2051 along the longitudinal direction. When the spring 202 is in a reset state, the first arc surface 2035 is located in the connecting hole 2051. Preferably, the first arc surfaces 2035 of the two groups of swinging parts 203 are both located in the connecting hole 2051, so as to reduce the size of the connecting hole 2051 and weaken the limiting effect on the sheet metal part. By providing the connecting hole 2051, when When the spring 202 is in the reset state, the two groups of swing members 203 of the bending parts are pushed out from the bending space 2031, and the avoidance portion 2034 is located in the connecting hole 2051, ensuring that the swing member 203 is lifted to the top of the bottom wall of the connecting hole 2051, so that the personnel can take out the bending parts after passing their fingers through the connecting hole 2051, thereby improving the unloading efficiency of the bending parts. At the same time, since the first arc surfaces 2035 of the two groups of swing members 203 are both located in the connecting hole 2051, that is, when the spring 202 is in the reset state, the bottom wall of the connecting hole 2051 is located below the first arc surface 2035, it is convenient to fine-tune the position of the sheet metal parts when loading the sheet metal parts.

[0052] In order to reduce the risk of scratches on the inner wall of the connecting hole 2051 when personnel are taking materials, the inner wall of the connecting hole 2051 adopts an arc transition, and the connecting hole 2051 and the top wall of the baffle 205 adopt an arc transition.

[0053] In terms of the assembly of the spring 202, the spring 202 is a torsion spring, one hook of the torsion spring is connected to the side wall of the die seat 201 by screws, and the other hook of the torsion spring is connected to the side wall of the swing member 203 by screws. By maximizing the length of the torsion spring in a limited space, the space utilization efficiency is improved. A longer torsion spring can provide a greater torque at the same torsion angle, thereby enhancing the driving force on the swing member 203 during the bending process. Secondly, the torsion spring is installed diagonally, which can provide a more uniform and stable force distribution and reduce the shaking of the swing member 203 during the bending process. Furthermore, the screw connection method simplifies the assembly process of the torsion spring, facilitates quick installation and disassembly, and makes maintenance and replacement more convenient.

[0054] Specifically, the die assembly 2 also includes a rotating shaft 206, and the swinging member 203 is provided with an assembly hole at its rotation center for rotationally assembling with the rotating shaft 206. The assembly hole is located at the junction of the side wall of the swinging member 203 and the bottom wall of the swinging member 203. One end of the rotating shaft 206 is connected to the side wall of the die seat 201, and the other end of the rotating shaft 206 is connected to the side wall of the limit plate 204. The rotation angle of the swinging member 203 is 42°±3°, preferably 42°.

[0055] Example 2: Figure 1-9 As shown, the difference from a bending mold in Example 1 lies in the structure of the swinging member 203. In order to further improve the smoothness of the swinging member 203 during rotation and reduce the resistance between the swinging member 203 and the groove seat, this embodiment also includes a needle roller 2033. The needle roller 2033 is rotatably assembled on the arc portion 2032 along the transition portion, and the rolling outer ring wall is rotatably assembled with the transition surface 2012. The design of the needle roller 2033 enables the swinging member 203 to greatly reduce the sliding friction through rolling contact with the transition surface 2012 during rotation, thereby reducing the resistance during rotation and making the movement of the swinging member 203 smoother. Secondly, the service life of the mold is extended, the maintenance and replacement frequency is reduced, and the maintenance cost of the bending mold is reduced. Of course, the placement groove 2011 and the transition surface 2012 are also adapted to the assembly of the swinging member 203 provided with the needle roller 2033.

[0056] Since it is not easy to polish the sheet metal again after bending, it is often necessary to polish it before bending to ensure the surface quality. In order to further reduce the friction between the sheet metal and the inner wall of the swinging member 203 during bending, which affects the surface quality of the bent part, the top wall, inner side wall, inner bottom wall and limiting portion of the swinging member 203 are all provided with a protective layer 2037, and the outer surface of the punch 1 is also provided with a protective layer 2037. The hardness of the protective layer 2037 is lower than that of the sheet metal. Therefore, when the sheet metal rubs against the punch 1 and / or the swinging member 203, no scratches will be generated on the surface of the sheet metal, thereby improving the processing quality of the bent part.

[0057] In terms of the specific structure of the protective layer 2037, the protective layer 2037 is made of plastic steel or polyurethane, preferably plastic steel. The plastic steel is adapted to the shape of the swinging member 203. The side of the swinging member 203 facing the plastic steel has a dovetail key with a protrusion, and the corresponding plastic steel and the swinging member 203 are provided with a dovetail groove on the side close to the swinging member 203. The plastic steel can be detachably assembled with the dovetail key of the swinging member 203 through the dovetail groove to form the protective layer 2037. At the same time, the plastic steel is easy to disassemble and replace. When the protective layer 2037 is worn out by use, the performance of the protective layer 2037 can be restored by replacing new plastic steel. It should be noted that the dovetail key is arranged on the inner bottom wall of the swinging member 203 and the top wall of the swinging member 203.

[0058] Example 3: Figure 1-10 As shown, a bending machine includes a machine base 3 and a cylinder 4, and also includes a bending mold in Example 1 or a bending mold in Example 2. The die assembly 2 is installed on the machine base 3 and the bending space 2031 is set upward. The fixed end of the cylinder 4 is connected to the machine base 3, and the movable end of the cylinder 4 is connected to the punch 1. The punch 1 is located directly above the die assembly 2 and moves back and forth toward the swinging member 203.

[0059] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A bending die, characterized in that: It includes a punch and a die assembly, the die assembly includes a die seat, a spring, and two groups of L-shaped swinging parts, the two groups of swinging parts are mirror images of each other, the swinging parts are rotatably assembled with the die seat, the two ends of the spring are respectively connected to the die seat and the swinging parts, the spring is used to pull the two groups of swinging parts to move away from each other, the connection between the spring and the swinging parts is located above the rotation center of the swinging parts, when the punch and the die assembly are in contact, the two groups of swinging parts move toward each other to form a bending space.

2. A bending die according to claim 1, characterized in that: The die seat is provided with a placement groove for accommodating two groups of the swinging members. When the male die and the female die assembly are in contact, the outer bottom surface of the swinging member is in contact with the bottom wall of the placement groove.

3. A bending die according to claim 2, characterized in that: An arc-shaped transition surface is arranged at the intersection of the side wall of the placement groove and the die seat, and an arc-shaped portion is arranged at the intersection of the outer side wall and the outer bottom wall of the swinging member, and the arc-shaped portion slides on the transition surface.

4. A bending die according to claim 1, characterized in that: A side wall of any group of the swinging members facing the other group of the swinging members is provided with an escape portion, and the escape portion is gradually inclined from top to bottom and toward the inner side of the swinging member.

5. A bending die according to claim 1, characterized in that: The die assembly further comprises a limiting plate, which is assembled with the die seat and covers the transverse end surface of the placement groove.

6. A bending die according to claim 5, characterized in that: The die assembly also includes a baffle plate assembled with the die seat, the baffle plate is located on one side of the two sets of swinging parts and above the limit plate, and a feeding channel is formed between the side wall of the baffle plate and the side wall of the die seat.

7. A bending die according to claim 6, characterized in that: A first arc surface is provided at the connection between the inner bottom wall of the swinging member and the avoidance portion, and a second arc surface is provided at the connection between the inner side wall of the swinging member and the top wall of the swinging member. When the spring is in a reset state, the tangent of the first arc surface and the tangent of the second arc surface are collinearly arranged and parallel to the bottom surface of the placement groove.

8. A bending die according to claim 7, characterized in that: The baffle is provided with a communication hole along the longitudinal direction, and when the spring is in a reset state, the first arc surface is located in the communication hole.

9. The bending mold according to claim 1, characterized in that: The spring is a torsion spring, one hook of the torsion spring is connected to the side wall of the die seat by screws, and the other hook of the torsion spring is connected to the side wall of the swinging member by screws.

10. A bending machine, comprising a machine base and a cylinder, characterized in that: It also includes a bending mold as described in any one of claims 1 to 9, wherein the die assembly is mounted on the machine base and the bending space is arranged upward, the fixed end of the cylinder is connected to the machine base, the movable end of the cylinder is connected to the punch, and the punch is located directly above the die assembly and moves back and forth toward the swinging member.

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