High-precision bending process for sheet metal parts

Abstract

The invention relates to a high-precision bending process for sheet metal parts, and belongs to the field of sheet metal part production processes. The method comprises the following steps: step 1, bending equipment is adopted to bend a sheet metal part, and a bent part of the sheet metal part is locked through a locking part, so that the bent part of the sheet metal part is prevented from rebounding to influence the bending precision; step 2, tempering; tempering equipment is adopted for tempering the bent sheet metal part and the locking part at the same time, and stress at the bent part is eliminated; and 3, after tempering is completed, the locking piece on the sheet metal part is moved out. According to the method, the bent sheet metal part is conveyed into the locking piece, positioning of the sheet metal part is achieved, then tempering treatment is conducted on the sheet metal part through tempering equipment, stress at the bent part is eliminated, and finally the locking piece on the sheet metal part is removed, so that the situation that the bent part of the sheet metal part rebounds, and consequently the bending precision is affected is avoided.

Description

Technical Field

[0001] The invention relates to a high-precision bending process for sheet metal parts, and belongs to the field of sheet metal part production processes. Background Art

[0002] Sheet metal is a comprehensive cold processing technology for thin metal plates, including shearing, punching / cutting / compounding, folding, welding, riveting, splicing, forming, etc. Its most notable feature is that the thickness of the same part is consistent. Products processed by sheet metal processing are called sheet metal parts. The sheet metal parts referred to in different industries are generally different, and are mostly used as the name during assembly. Sheet metal parts are products processed by sheet metal processing. Sheet metal parts are made through filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, metal plate bending forming, die forging, and water jet cutting. Sheet metal parts have the characteristics of light weight, high strength, conductivity, low cost, and good performance in large-scale mass production. They have been widely used in electronics, communications, automotive industry, medical equipment and other fields. Bending operations are required in the production process of sheet metal parts.

[0003] The Chinese invention patent with publication number CN112845697B discloses an angle-adjustable bending machine and a bending method thereof for sheet metal production, which belongs to the technical field of sheet metal production, and includes a machine base, a horizontal plate, which is installed on the front of the machine base, a conveyor installed on the upper surface of the horizontal plate, and the conveyor is used to convey the sheet metal. A mounting plate 1 is installed on the machine base on the left side above the conveyor through an elastic recovery unit, and a bending knife and a pressing member are installed on the lower surface of the mounting plate 1, and the pressing member is connected to the elastic recovery unit through a machine frame; an angle adjustment member is provided to cooperate with a rotatably installed bending plate for use, and the force generated by the deformation of the spring is used to drive the card block to be stuck in the card slot at different positions, and under the action of the trapezoidal slider, the bending plate can rotate when the movable seat moves back and forth, so that the inclination angle of the bending plate can be adjusted, and the bending angle can be adjusted according to actual processing needs. The structure is simple and the operation is convenient. However, due to the different materials of sheet metal parts, some sheet metal parts have large stress in the bending part after bending. After the bending is completed and the sheet metal part is taken out, the bending part of the sheet metal part will rebound, thus affecting the bending accuracy. Therefore, there is a need for a high-precision bending process for sheet metal parts to improve the bending accuracy of sheet metal parts. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, a high-precision bending process for sheet metal parts is provided to improve the bending accuracy of sheet metal parts.

[0005] The technical solution adopted by the present invention to solve the above problems is: a high-precision bending process for sheet metal parts, comprising the following steps; Step 1: Use bending equipment to bend the sheet metal part, and lock the bent part of the sheet metal part with a locking part to prevent the bent part of the sheet metal part from rebounding and affecting the bending accuracy; Step 2: Tempering; Use tempering equipment to temper the bent sheet metal parts and the locking parts at the same time to eliminate the stress at the bending part; Step 3: After tempering is completed, remove the locking parts on the sheet metal.

[0006] Preferably, the step 1 includes the following steps: Step 1.1, place the sheet metal part to be bent on the feeding assembly, and use the feeding assembly to transport the sheet metal part to the bending assembly; Step 1.2: The sheet metal part is bent by the bending assembly. Meanwhile, the feeding assembly places the next sheet metal part to be bent. Step 1.3: After the bending is completed, the feeding assembly continues to perform the conveying action, that is, the sheet metal at the feeding assembly is transported to the bending assembly, and this sheet metal pushes the sheet metal at the original bending assembly to be transported to the locking component, and the locking component is used to lock the bent part on the sheet metal to prevent the bent part of the sheet metal from rebounding and affecting the bending accuracy.

[0007] Preferably, the bending equipment includes a workbench and a feeding assembly, a bending assembly and a locking member sequentially arranged on the workbench, the feeding assembly is used to transport the sheet metal part to the bending assembly, the bending assembly is used to perform the bending action on the sheet metal part, and the locking member is used to lock the bending portion on the sheet metal part; The bending assembly includes a pressure seat, a fixed plate and two rotating plates. The two rotating plates are respectively located on both sides of the fixed plate. The rotating plate is rotatably connected to the fixed plate. A power system is provided on both fixed plates. The rotation of the rotating plates is realized by the power system, and the two rotating plates have opposite directions. The pressure seat is driven to rise and fall by a cylinder. The pressure seat is located above the fixed plate and between the two rotating plates.

[0008] Preferably, the feeding assembly includes a support plate, a push rod and a moving unit. The support plate is arranged horizontally, and the support plate and the workbench are positioned horizontally. A slide groove is provided on the support plate, and the slide groove extends to a side close to the bending assembly. The push rod passes vertically through the slide groove, and the push rod matches the slide groove. The moving unit is connected to the push rod, and the push rod is driven to move by the moving unit.

[0009] Preferably, the movable unit includes a lead screw and a slider, the lead screw is arranged horizontally, the slider is threadedly connected to the lead screw, the slider is fixedly set at the bottom end of the push rod, one end of the lead screw is driven by a motor, the top of the workbench is concave to form a drive cavity, and the support plate, motor, lead screw and slider are all located in the drive cavity.

[0010] Preferably, a convex strip is provided on the top of the driving cavity, and the bottom of the support plate abuts against the top of the convex strip.

[0011] Preferably, the support plate matches the driving cavity, that is, the front, back, left, and right sides of the support plate are respectively fitted with the front, back, left, and right inner walls of the driving cavity.

[0012] Preferably, the locking member is a locking frame, which matches the shape of the bent sheet metal. The locking frame includes a base frame and two oblique frames, which are fixed in an eight-shaped shape on both sides of the base frame, and the oblique frames are located above the base frame.

[0013] Preferably, the base frame includes a first frame body and a second frame body, the first frame body is distributed along the arrangement direction of the two oblique frames with the second frame body, a blind hole is provided at one end of the first frame body, and a protrusion is provided at one end of the second frame body, the protrusion matches the blind hole, the protrusion is inserted into the blind hole, and the protrusion and the blind hole are locked by a locking pin.

[0014] Preferably, the locking frame is provided in plurality, and the plurality of locking frames are arranged side by side; A reinforcing rib is provided between two adjacent oblique frames along the conveying direction of the sheet metal parts, and the inner side wall of the reinforcing rib is in the same plane as the inner side wall of the oblique frame.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention provides a high-precision bending process for sheet metal parts. The sheet metal parts are positioned by conveying the bent sheet metal parts into a locking part. Then, the sheet metal parts are tempered by tempering equipment to eliminate the stress at the bent portion. Finally, the locking part on the sheet metal parts is removed. In this way, the bent portion of the sheet metal parts is prevented from rebounding and affecting the bending accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the bending equipment; Figure 2 This is the main view of the bending equipment; Figure 3 It is a top view of the bending equipment; Figure 4 Schematic diagram of the connection structure between the sheet metal part and the bending component before bending; Figure 5 Schematic diagram of the connection structure between the fixed plate and the rotating plate before bending; Figure 6 Schematic diagram of the connection structure between the sheet metal part and the bending component after bending; Figure 7 It is a structural diagram of the sheet metal after bending; Figure 8 Schematic diagram of the connection structure between the sheet metal part and the locking part; Figure 9 It is a structural diagram of the locking frame; Figure 10 is a structural diagram of the first frame; Figure 11 is a structural schematic diagram of the second frame; Figure 12 It is a structural diagram of the workbench; Figure 13 It is a first structural schematic diagram of the feeding assembly; Figure 14 This is a second structural schematic diagram of the feeding component.

[0017] in: Workbench 1, feeding assembly 2, bending assembly 3, locking component 4, sheet metal component 5; Support plate 21, push rod 22, moving unit 23, slide 24; Lead screw 231, slider 232, motor 233, drive cavity 234, ridge 235; Press seat 31, fixed plate 32, rotating plate 33, cylinder 34; Locking frame 41, reinforcing rib 42; Base frame 411, inclined frame 412; First frame 4111, second frame 4112, blind hole 4113, protrusion 4114, locking pin 4115, first locking hole 4116, second locking hole 4117; Bending portion 51 . DETAILED DESCRIPTION

[0018] like Figure 1-14 As shown, a high-precision bending process for sheet metal parts in this embodiment includes the following steps: Step 1: Use a bending device to bend the sheet metal part 5, and lock the bent portion 51 of the sheet metal part 5 using a locking member 4 to prevent the bent portion 51 of the sheet metal part 5 from rebounding and affecting the bending accuracy; Step 1.1, place the sheet metal part 5 to be bent on the feeding assembly 2, and convey the sheet metal part 5 to the bending assembly 3 through the feeding assembly 2; Step 1.2: The sheet metal part 5 is bent by the bending assembly 3. Meanwhile, the feeding assembly 2 places the next sheet metal part 5 to be bent. Step 1.3: After the bending is completed, the feeding assembly 2 continues to perform the conveying action, that is, the sheet metal part 5 at the feeding assembly 2 is conveyed to the bending assembly 3, and this sheet metal part 5 pushes the sheet metal part 5 originally at the bending assembly 3 to be conveyed to the locking member 4, and the locking member 4 locks the bent portion 51 of the sheet metal part 5 to prevent the bent portion 51 of the sheet metal part 5 from rebounding and affecting the bending accuracy; The bending equipment includes a workbench 1 and a feeding assembly 2, a bending assembly 3 and a locking member 4 sequentially arranged on the workbench 1. The feeding assembly 2 is used to convey a sheet metal part 5 to the bending assembly 3. The bending assembly 3 is used to perform a bending operation on the sheet metal part 5. The locking member 4 is used to lock the bending portion 51 on the sheet metal part 5. The feeding assembly 2 includes a support plate 21, a push rod 22 and a moving unit 23. The support plate 21 is arranged horizontally. The support plate 21 and the workbench 1 are positioned horizontally. A slide groove 24 is provided on the support plate 21. The slide groove 24 extends to a side close to the bending assembly 3. The push rod 22 vertically passes through the slide groove 24. The push rod 22 matches the slide groove 24. The moving unit 23 is connected to the push rod 22, and the push rod 22 is driven to move by the moving unit 23. The movable unit 23 includes a screw 231 and a slider 232. The screw 231 is arranged horizontally, and the slider 232 is threadedly connected to the screw 231. The slider 232 is fixedly arranged at the bottom end of the push rod 22. One end of the screw 231 is driven by the motor 233. The top of the workbench 1 is concave to form a driving chamber 234. The support plate 21, the motor 233, the screw 231 and the slider 232 are all located in the driving chamber 234. The top of the support plate 21 is in the same plane as the top of the workbench 1. The top of the driving chamber 234 is provided with a ridge 235. The bottom of the support plate 21 abuts against the top of the ridge 235. In this way, the support plate 21 is supported by the ridge 235. The support plate 21 is matched with the driving chamber 234, that is, the front, back, left and right sides of the support plate 21 are respectively in contact with the front, back, left and right inner walls of the driving chamber 234. The sheet metal part 5 is placed on the top of the support plate 21, and the sheet metal part 5 is located between the push rod 22 and the bending assembly 3. Then, the motor 233 is started to rotate the lead screw 231, so that the slider 232 moves on the lead screw 231. The movement of the slider 232 drives the push rod 22 to move synchronously, that is, the push rod 22 moves toward the bending assembly 3. The movement of the push rod 22 pushes the sheet metal part 5 to the bending assembly 3. When the next sheet metal part 5 needs to be pushed, the push rod 22 is moved in the opposite direction to achieve reset. The bending assembly 3 includes a press seat 31, a fixed plate 32 and two rotating plates 33. The two rotating plates 33 are respectively located on both sides of the fixed plate 32. In fact, the arrangement direction of the two rotating plates 33 is perpendicular to the conveying direction of the sheet metal part 5. The rotating plates 33 are rotatably connected to the fixed plate 32. Both fixed plates 32 are provided with a power system, which realizes the rotation of the rotating plates 33 through the power system, and the two rotating plates 33 have opposite directions. The press seat 31 is driven to rise and fall by a cylinder 34. The press seat 31 is located above the fixed plate 32 and between the two rotating plates 33. When the cam 32 is in the upright position, the two cams 33 are in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, and the cam 32 is in the upright position, so that the cam 32 is in the upright position, Here, the power system can be an oil cylinder, the cylinder body of the oil cylinder is connected to the workbench 1, and the piston end of the oil cylinder is connected to the rotating plate 33. When the oil cylinder is started, the piston end of the oil cylinder extends, which drives the rotating plate 33 to rotate on the fixed plate 32. When the piston end of the oil cylinder retracts, it drives the rotating plate 33 to rotate in the opposite direction on the fixed plate 32. Next, the two rotating plates 33 are rotated in opposite directions by the power system to achieve reset, and then the sheet metal part 5 at the feeding assembly 2 is transported to the fixed plate 32, and the bent sheet metal part 5 on the fixed plate 32 is transported to the locking member 4, and the locking member 4 is used to lock the bent portion 51 on the sheet metal part 5; Finally, the locking member 4 and the bent sheet metal part 5 are transported to the tempering equipment; Here, it should be noted that a robot can be used to transport the sheet metal part 5 to the feeding assembly 2 and to transport the locking part 4 and the bent sheet metal part 5 to the tempering equipment; Step 2: Tempering; Tempering the bent sheet metal part 5 and the locking part 4 simultaneously using a tempering device to eliminate stress at the bent portion 51; Step 3: After tempering is completed, remove the locking member 4 on the sheet metal part 5; The locking member 4 is a locking frame 41, which matches the shape of the bent sheet metal member 5. The locking frame 41 includes a base frame 411 and two oblique frames 412. The two oblique frames 412 are fixedly arranged on both sides of the base frame 411 in an "eight" shape, and the oblique frames 412 are located above the base frame 411. The base frame 411 includes a first frame body 4111 and a second frame body 4112. The first frame body 4111 is distributed along the arrangement direction of the two oblique frames 412 with the second frame body 4112. A blind hole 4113 is provided at one end of the first frame body 4111, and a protrusion 4114 is provided at one end of the second frame body 4112. The protrusion 4114 matches the blind hole 4113, and the protrusion 4114 is inserted into the blind hole 4113. The protrusion 4114 and the blind hole 4113 are locked by a locking pin 4115. Specifically, a first locking hole 4116 is provided at the blind hole 4113, and a second locking hole 4117 is provided on the protrusion 4114. The locking pin 4115 passes through the first locking hole 4116 and the second locking hole 4117 in sequence. The protrusion 4114 is polygonal. The locking frames 41 are provided in plurality, and the plurality of locking frames 41 are arranged side by side. Specifically, the plurality of locking members 4 are spaced apart along the conveying direction of the sheet metal part 5 , and the specific number of the locking frames 41 is three; A reinforcing rib 42 is provided between two adjacent oblique frames 412 along the conveying direction of the sheet metal part 5 , and the inner side wall of the reinforcing rib 42 is in the same plane as the inner side wall of the oblique frame 412 ; When the sheet metal part 5 is conveyed to the locking frame 41 after being bent, the locking frame 41 and the workbench 1 are in a fixed state. Specifically, the locking frame 41 is fixed to the workbench 1 by a manipulator, so that the bottom of the sheet metal part 5 is in contact with the top of the base frame 411, and the outer sides of the bent portion 51 of the sheet metal part 5 are in contact with the inner side walls of the reinforcing rib 42 and the inner side walls of the oblique frame 412. In this way, the positioning of the sheet metal part 5 is achieved, and the springback of the bent portion 51 of the sheet metal part 5 is avoided to affect the bending accuracy. To sum up, the sheet metal part 5 is positioned by conveying the bent sheet metal part 5 into the locking part 4. Then, the sheet metal part 5 is tempered by the tempering equipment to eliminate the stress at the bent portion 51. Finally, the locking part 4 on the sheet metal part 5 can be removed. In this way, the bent portion 51 of the sheet metal part 5 is prevented from rebounding and affecting the bending accuracy.

[0019] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A high-precision bending process for sheet metal parts, characterized by: The method includes the following steps: Step 1: Using a bending device to bend the sheet metal part (5), and locking the bending portion (51) of the sheet metal part (5) by using a locking member (4) to prevent the bending portion (51) of the sheet metal part (5) from rebounding and affecting the bending accuracy; Step 2: Tempering; Tempering the bent sheet metal part (5) and the locking part (4) simultaneously using a tempering device to eliminate stress at the bent portion (51); Step 3: After tempering is completed, remove the locking member (4) on the sheet metal part (5).

2. The high-precision bending process for sheet metal parts according to claim 1, characterized in that: The step 1 includes the following steps: Step 1.1, placing the sheet metal part (5) to be bent on the feeding component (2), and conveying the sheet metal part (5) to the bending component (3) through the feeding component (2); Step 1.2, the sheet metal part (5) is bent by the bending component (3), and at the same time, the feeding component (2) places the next sheet metal part (5) to be bent; Step 1.3: After the bending is completed, the feeding component (2) continues to perform the conveying action, that is, the sheet metal part (5) at the feeding component (2) is conveyed to the bending component (3), and this sheet metal part (5) pushes the sheet metal part (5) originally at the bending component (3) to be conveyed to the locking part (4), and the locking part (4) is used to lock the bending part (51) on the sheet metal part (5), so as to prevent the bending part (51) of the sheet metal part (5) from rebounding and affecting the bending accuracy.

3. The high-precision bending process for sheet metal parts according to claim 1, characterized in that: The bending device comprises a workbench (1) and a feeding assembly (2), a bending assembly (3) and a locking member (4) which are sequentially arranged on the workbench (1), wherein the feeding assembly (2) is used to transport the sheet metal part (5) to the bending assembly (3), the bending assembly (3) is used to perform a bending action on the sheet metal part (5), and the locking member (4) is used to achieve locking of the bending portion (51) on the sheet metal part (5); The bending assembly (3) comprises a pressure seat (31), a fixed plate (32) and two rotating plates (33). The two rotating plates (33) are respectively located on both sides of the fixed plate (32). The rotating plates (33) are rotatably connected to the fixed plate (32). Both fixed plates (32) are provided with a power system. The rotation of the rotating plates (33) is realized by the power system, and the two rotating plates (33) rotate in opposite directions. The pressure seat (31) is driven to rise and fall by a cylinder (34). The pressure seat (31) is located above the fixed plate (32) and between the two rotating plates (33).

4. The high-precision bending process for sheet metal parts according to claim 3, characterized in that: The feeding assembly (2) includes a support plate (21), a push rod (22) and a moving unit (23), wherein the support plate (21) is arranged horizontally, and the support plate (21) and the workbench (1) are positioned in the horizontal direction, and a slide groove (24) is provided on the support plate (21), and the slide groove (24) extends to a side close to the bending assembly (3), and the push rod (22) vertically passes through the slide groove (24), and the push rod (22) matches the slide groove (24), and the moving unit (23) is connected to the push rod (22), and the push rod (22) is driven to move by the moving unit (23).

5. The high-precision bending process for sheet metal parts according to claim 4, characterized in that: The moving unit (23) includes a lead screw (231) and a slider (232), wherein the lead screw (231) is arranged horizontally, and the slider (232) is threadedly connected to the lead screw (231). The slider (232) is fixedly arranged at the bottom end of the push rod (22), and one end of the lead screw (231) is driven by a motor (233). The top of the workbench (1) is concave to form a drive cavity (234), and the support plate (21), the motor (233), the lead screw (231) and the slider (232) are all located in the drive cavity (234).

6. The high-precision bending process for sheet metal parts according to claim 4, characterized in that: A convex strip (235) is provided on the top of the driving cavity (234), and the bottom of the support plate (21) abuts against the top of the convex strip (235).

7. The high-precision bending process for sheet metal parts according to claim 4, characterized in that: The support plate (21) matches the drive cavity (234), that is, the front, rear, left, and right sides of the support plate (21) fit in contact with the front, rear, left, and right inner walls of the drive cavity (234) respectively.

8. A high-precision sheet metal bending process according to any one of claims 1 to 7, characterized in that: The locking member (4) is a locking frame (41), the locking frame (41) matches the shape of the bent sheet metal member (5), and the locking frame (41) comprises a base frame (411) and two oblique frames (412). The two oblique frames (412) are fixedly arranged on both sides of the base frame (411) in an eight-shaped pattern, and the oblique frames (412) are located above the base frame (411).

9. The high-precision bending process for sheet metal parts according to claim 8, characterized in that: The base frame (411) comprises a first frame body (4111) and a second frame body (4112), wherein the first frame body (4111) is distributed along the arrangement direction of the two oblique frames (412) with the second frame body (4112), a blind hole (4113) is provided at one end of the first frame body (4111), and a protrusion (4114) is provided at one end of the second frame body (4112), wherein the protrusion (4114) matches the blind hole (4113), the protrusion (4114) is inserted into the blind hole (4113), and the protrusion (4114) and the blind hole (4113) are locked by a locking pin (4115).

10. The high-precision bending process for sheet metal parts according to claim 8, characterized in that: The locking frames (41) are provided in plurality, and the plurality of locking frames (41) are arranged side by side; A reinforcing rib (42) is provided between two adjacent oblique frames (412) along the conveying direction of the sheet metal part (5), and the inner side wall of the reinforcing rib (42) and the inner side wall of the oblique frame (412) are in the same plane.

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