Progressive local forging and bending forming die and method for U-shaped connecting piece

Abstract

The progressive local forging and bending forming die comprises a female die, a front edge pressing male die, a forming male die, a rear edge pressing male die and a bending control device, wherein the front edge pressing male die, the forming male die and the rear edge pressing male die are sequentially arranged in the female die, and the bending control device is arranged at the tail end of the female die. The upper die plate drives the front edge pressing male die and the rear edge pressing male die through the front hydraulic cylinder and the rear hydraulic cylinder respectively and drives the forming male die to press downwards, and a blank is input from one side of the head end of the female die and intermittently output to the tail end bending control device. According to the method, the forming load can be reduced, the manufacturing period and the mold specification are shortened, the material utilization rate and the component performance are improved, and high-performance, low-cost and short-process preparation of the U-shaped connecting piece is promoted.

Description

Technical Field

[0001] The invention relates to a technology in the field of metal plastic processing, in particular to a progressive local forging and bending forming die and method for a U-shaped connecting piece. Background Art

[0002] In the forming of U-shaped connectors, both the integral forging and integral stretch-bending processes have the disadvantages of high forming tonnage and large die structure; traditional local forging is prone to defects such as folding and rib penetration. The continuous bending process is limited by factors such as die structure, which is prone to cause bending instability, surface distortion or convex hull phenomenon of components. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a U-shaped connector progressive local forging and bending forming die and method, which can reduce the forming load, shorten the manufacturing cycle and die specifications, improve material utilization and component performance, and promote the high-performance, low-cost, short-process preparation of U-shaped connectors.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention relates to a progressive local forging and bending forming die for a U-shaped connector, comprising: a die, a front edge pressing punch, a forming punch, a rear edge pressing punch arranged in sequence inside the die, and a bending control device arranged at the end of the die, wherein: the upper die plate drives the front edge pressing punch and the rear edge pressing punch through the front hydraulic cylinder and the rear hydraulic cylinder respectively and drives the forming punch to be pressed down, and the blank is input from one side of the head end of the die and intermittently output to the end bending control device.

[0006] The bending control device includes: a rotating base, a pair of main control arms arranged thereon and corresponding auxiliary control arms connected thereto, and an inner bending roller and an outer bending roller respectively vertically arranged between the pair of main control arms and the auxiliary control arms, wherein: the inner bending roller and the outer bending roller revolve around the rotating base while rotating on their own.

[0007] The radius of the revolution is adjusted according to the curvature radius of the target component to control the length of the upper main control arm and the lower main control arm, thereby achieving bending forming of the component.

[0008] The main control arm and the auxiliary control arm are telescopically connected, and the distance between the main control arm and the auxiliary control arm is determined according to the width of the component.

[0009] The concave die surface is determined by the outer contour of the U-shaped connector, and the length of the concave die is determined by the total length of the front edge pressing punch, the forming punch and the rear edge pressing punch after installation;

[0010] The strokes of the front hydraulic cylinder and the rear hydraulic cylinder are greater than or equal to the amount of single blank pressing; there is a height difference between the bottom of the front edge pressing punch and the bottom of the rear edge pressing punch, and the height difference is equal to the amount of single blank pressing.

[0011] The front pressing punch, forming punch and rear pressing punch have the same working surfaces, which are determined by the shapes of the inner components of the adjacent webs of the U-shaped connector; the forming punch is located between the front pressing punch and the rear pressing punch, and there is a gap between adjacent molds, the size of the gap is determined by the thickness of the webs of the U-shaped connector.

[0012] A feeding device is provided on the front side of the die to realize horizontal quantitative movement of the blank. The feeding distance is the spacing between adjacent web reinforcement ribs of the U-shaped connector to prevent the forming punch and the rear edge pressing punch from pressing the web reinforcement ribs of the U-shaped connector.

[0013] The present invention relates to a method for progressive local forging and bending of a U-shaped connector based on the above-mentioned die, comprising:

[0014] Step 1: Clamp the end of the blank away from the die through the feeding device and push the blank through the input end of the die to the bottom of the forming punch, start the press and run it downward through the upper template until the front edge pressing punch contacts the blank, at which time the rear edge pressing punch, the outer bending roller and the inner bending roller do not work;

[0015] Step 2: The press continues to move downward until the forming punch contacts the blank. During this process, the front hydraulic cylinder is pushed back, and the front blanking punch continues to output a blanking force to the blank.

[0016] Step 3: The press moves downward again, and the forming punch partially loads the blank to complete the first step of forming the blank. The front hydraulic cylinder continues to push back, and the front blanking punch continues to output the blanking force.

[0017] Step 4: The press returns, and the front hydraulic cylinder pushes out; after the press returns, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed. The moving distance of the blank is determined according to the spacing between the adjacent web stiffeners of the U-shaped connector;

[0018] Step 5. After the feeding is completed, the press moves downward again. The front edge pressing punch contacts the blank again through the downward action of the press, and the rear edge pressing punch contacts the formed area; the press continues to move downward until the forming punch contacts the blank. During this process, the front hydraulic cylinder and the rear hydraulic cylinder continue to push back, and the front edge pressing punch and the rear edge pressing punch continue to apply the edge pressing force to the undeformed area and the deformed area of ​​the blank respectively; the press continues to move downward, and the forming punch locally loads the blank, causing the material to deform, completing the second step of forming; during this process, since the material has not yet been sent to the outer bending roller and the inner bending roller area, the outer bending roller and the inner bending roller are still not in effect.

[0019] Step 6: The press returns, and the front hydraulic cylinder and the rear hydraulic cylinder are pushed out; after the press returns, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed;

[0020] Step 7, the press moves downward, and the front and rear pressing punches apply pressing forces to the undeformed area and the formed area of ​​the component respectively under the action of the front and rear hydraulic cylinders; the press continues to move downward, and the forming punch approaches the blank to form the blank below. During this process or after the forming punch completes forming the blank, the bending control device is turned on, and the inner bending roller and the outer bending roller bend the formed component under the action of the bending control device; in this step, local forming and local bending of the component both occur.

[0021] Step 8: During the return stroke of the press, the front hydraulic cylinder and the rear hydraulic cylinder are pushed out, and the inner bending roller and the outer bending roller are controlled by the bending control device to return to their original positions; after the return stroke of the press is completed, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed;

[0022] Step 9: Repeat steps 7 and 8 until all the ribs of the U-shaped connector are formed and the bending of the component is achieved. Technical Effects

[0023] The present invention controls material flow based on the elastic compensation function of the hydraulic system and the three-dimensional compressive stress, and cooperates with the bending method of the revolution-passive rotation composite motion mode, so as to divide the overall closed forging and overall stretch-bending process into multiple local closed forging and local closed bending forming, which greatly shortens the component preparation cycle, avoids multiple heating of components between multiple processes, and reduces the energy consumption and manufacturing cost of the components; automatically compensates for the thickness change of the material through the hydraulic cylinder stroke difference to ensure the balance of the blank holding force in each step, and at the same time avoids the stress concentration problem caused by the traditional overall blank holding; significantly reduces the overall mold specifications and forming tonnage, realizes the ability of small-tonnage equipment to manufacture large components, and solves the problems of lateral flow of materials in the traditional local forging forming process and surface distortion or convex hull caused by the local lack of mold constraints in the traditional continuous bending process; solves the problem that the traditional continuous bending method is not suitable for the bending of complex profiles; replaces the static friction in the traditional continuous bending process or the dynamic friction of active rotation with the dynamic friction of the staged passive rotation method, significantly reduces the forming resistance of the component during the bending process, and solves the problem of surface scratches on complex profiles during the bending process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the mold of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the U-shaped connector of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the inner and outer bending rollers of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the front hydraulic cylinder and the front edge pressing punch of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the concave mold of the present invention;

[0029] Figure 6 It is a flow chart of the present invention;

[0030] Figure 7 It is an effect diagram of the embodiment;

[0031] In the figure: 1 feeding device, 2 blank, 3 front edge pressing punch, 4 front hydraulic cylinder, 5 die, 6 forming punch, 7 rear hydraulic cylinder, 8 rear edge pressing punch, 9 inner bending roller, 10 outer bending roller, 11 upper template, 12 rotating base, 13 upper main control arm, 14 lower main control arm, 15 upper auxiliary control arm, 16 lower auxiliary control arm. DETAILED DESCRIPTION

[0032] like Figure 1-Figure 5 As shown, this embodiment involves a progressive local forging and bending forming die for a U-shaped connector, including: a die 5, a front edge pressing punch 3, a forming punch 6 and a rear edge pressing punch 8 sequentially arranged inside the die 5, a feeding device 1 arranged at the front side of the die 5, and a bending control device relatively rotatably arranged at the end of the die 5, wherein: the upper mold plate 11 drives the front edge pressing punch 3 and the rear edge pressing punch 8 through the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 respectively and drives the forming punch 6 to press down, and the blank 2 is pushed horizontally from the side of the head end of the die 5 through the feeding device 1, and is intermittently output to the end bending control device.

[0033] The bending control device includes: a rotating base 12, a pair of main control arms 13, 14 arranged thereon and corresponding auxiliary control arms 15, 16 connected thereto, and an inner bending roller 9 and an outer bending roller 10 respectively vertically arranged between the pair of main control arms and the auxiliary control arms, wherein: the inner bending roller 9 and the outer bending roller 10 cooperate with the upper auxiliary control arm 15 and the lower auxiliary control arm 16 via a sleeve structure, the inner bending roller 9 and the outer bending roller 10 revolve around the rotating base 12, and the revolution radius of the inner bending roller 9 and the outer bending roller 10 is controlled by the rotating base 12 by adjusting the length of the upper main control arm 13 and the lower main control arm 14 according to the curvature radius of the target component, thereby realizing the bending forming of the component.

[0034] like Figure 3As shown, the inner bending roller 9 and the outer bending roller 10 both adopt an I-section sleeve structure, and the semi-enclosed shape of the combination of the two matches the outer contour of the component, solving the deformation instability problem caused by uneven deformation of the inner and outer sides of the component during the bending process. The spacing between the inner bending roller 9 and the outer bending roller 10 can be determined by adjusting the length of the upper auxiliary control arm 15 and the lower auxiliary control arm 16, and both can rotate around the central axis to achieve the effect of replacing static friction with dynamic friction, solving the scratches on the surface of the profile during the bending process.

[0035] like Figure 5 As shown, the profile of the die 5 is determined by the outer contour of the U-connector, and the length of the die 5 is determined by the total length of the front pressing punch 3, the forming punch 6 and the rear pressing punch 8 after installation;

[0036] The stroke of the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 is greater than or equal to the pressing amount of the single blank 2; there is a height difference between the bottom of the front edge pressing punch 3 and the bottom of the rear edge pressing punch 8, and the height difference is equal to the pressing amount of the single blank 2;

[0037] The front pressing punch 3, the forming punch 6 and the rear pressing punch 8 have the same working profile, which is determined by the shape of the inner components of the adjacent webs of the U-shaped connector; the forming punch 6 is located between the front pressing punch 3 and the rear pressing punch 8, and there is a gap between the adjacent molds, the size of which is determined by the thickness of the web of the U-shaped connector;

[0038] A feeding device 1 is provided on the front side of the die to realize horizontal quantitative movement of the blank 2. The feeding distance is the spacing between adjacent web reinforcement ribs of the U-shaped connector to prevent the forming punch 6 and the rear edge pressing punch 8 from pressing the web reinforcement ribs of the U-shaped connector.

[0039] like Figure 2 As shown, the U-shaped connector is made of 1 series aluminum alloy, and web reinforcement ribs are locally distributed on the component. The spacing between adjacent web reinforcement ribs is 100 mm and the thickness is 5 mm.

[0040] like Figure 6 As shown, the progressive local forging and bending forming method of the U-shaped connector based on the above-mentioned die in this embodiment includes:

[0041] Step 1, clamp the end of the blank away from the die 5 through the feeding device 1 and push the blank 2 through the input end of the die 5 to the bottom of the forming punch 6, start the press and run it downward through the upper template until the front edge pressing punch 3 contacts the blank 2, at this time, the rear edge pressing punch 8, the outer bending roller 10 and the inner bending roller 9 do not work;

[0042] Step 2, the press continues to move downward until the forming punch 6 contacts the blank 2. During this process, the front hydraulic cylinder 4 is pushed back, and the front blank pressing punch 3 continuously outputs a blank pressing force to the blank 2.

[0043] Step 3: The press machine continues to move downward, the forming punch 6 partially loads the blank 2, and the first step of forming of the blank 2 is completed. The front hydraulic cylinder 4 continues to push back, and the front blank pressing punch 3 continues to output the blank pressing force.

[0044] Step 4: The press returns, and the front hydraulic cylinder 4 is pushed out; after the press returns, the feeding device 1 is started, and the blank 2 is quantitatively moved to the next area to be deformed;

[0045] Step 5, after the feeding is completed, the press moves downward again. The front edge pressing punch 3 contacts the blank 2 again through the action of the downward movement of the press, and the rear edge pressing punch 8 contacts the formed area; the press continues to move downward until the forming punch 6 contacts the blank 2. During this process, the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 continue to push back, and the front edge pressing punch 3 and the rear edge pressing punch 8 continue to apply the edge pressing force to the undeformed area and the deformed area of ​​the blank 2 respectively; the press continues to move downward, and the forming punch 6 locally loads the blank 2, causing the material to deform, completing the second step of forming; during this process, since the material has not yet been sent to the area of ​​the outer bending roller 10 and the inner bending roller 9, the outer bending roller 10 and the inner bending roller 9 are still not in effect.

[0046] Step 6: The press returns, and the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 are pushed out; after the press returns, the feeding device 1 is started, and the blank 2 is quantitatively moved to the next area to be deformed;

[0047] Step 7, the press moves downward, and the front pressing punch 3 and the rear pressing punch 8 apply pressing force to the undeformed area and the formed area of ​​the component under the action of the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 respectively; the press continues to move downward, and the forming punch 6 approaches the blank 2 to form the blank 2 below. During this process or after the forming punch 6 completes the forming of the blank 2, the rotating base 12 is turned on, and the inner bending roller 9 and the outer bending roller 10 bend the formed component under the action of the rotating base 12; in this step, local forming and local bending of the component both occur.

[0048] Step 8: During the return stroke of the press, the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 are pushed out, and the inner bending roller 9 and the outer bending roller 10 are controlled by the rotating base 12 to return to their original positions; after the return stroke of the press is completed, the feeding device 1 is started, and the blank 2 is moved quantitatively to the next area to be deformed;

[0049] Step 9: Repeat steps 7 and 8 until all the ribs of the U-shaped connector are formed and the bending of the component is achieved.

[0050] In step 1 to step 9, the downward speed of the press is in the range of 0.1 to 15 mm / s.

[0051] In step 2 to step 9, the hydraulic tonnage range of the front hydraulic cylinder 4 and the rear hydraulic cylinder 7 is 0.5 to 50 tons, and the stroke is 0 to 50 mm.

[0052] In step 7 to step 9, the angular velocity of the rotating base 12 is 0.1-10 rad / s, the orbital radius is 200-2000 mm, and the radial distance between the inner bending roller 9 and the outer bending roller 10 is 30-100 mm.

[0053] After specific simulation experiments, at room temperature, progressive local forging and bending forming were carried out with parameters such as billet moving distance of 100mm, pressing speed of 1mm / s, angular velocity of 0.1rad / s, blank holding force of 30 tons, pressing amount of 7.5mm and orbital radius of 1000mm: the U-shaped connectors can be stably formed in each forming step, and no obvious local loading deformation defects such as folding and reinforcing and bending instability defects were found; the distribution of equivalent strain in each area of ​​the component is relatively uniform and consistent, indicating that the forming process method is relatively stable and reliable, and the forming uniformity of the component is good.

[0054] like Figure 7 As shown, the result of progressive local forging and bending of U-shaped connectors. In the first three loading steps, since the components were not sent to the action area of ​​the inner bending roller 9 and the outer bending roller 10, only local forging and forming occurred during the first three loading steps. After the third loading step, the components have been sent to the action area of ​​the inner bending roller 9 and the outer bending roller 10. Therefore, the fourth loading step and subsequent loading steps all involve local "forging-bending" composite forming of the components. During the progressive local forging and bending forming process, the shape of the components is relatively stable, and no significant forming defects such as piercing of reinforcement and deformation instability occur; by comparing the equivalent strain distribution of the components after different loading steps, it can be found that the equivalent strain distribution of the components after each loading step has good consistency, and the deformation uniformity of the components is high; the above results fully demonstrate that progressive local forging and bending forming has good stability and reliability.

[0055] The present invention adopts a method of progressive loading and bending from front to back in order to reduce the forming load of the component and avoid filling defects of the U-shaped connector. Since in the progressive local forging and bending forming process proposed by the present invention, the component is only partially placed in the mold structure, the overall length of the mold is much smaller than the length of the component. Taking the component length of about 1000mm as an example, the length of the progressive local forging and bending forming mold is about 1 / 3 of the component length. If the length of the component is further increased, the length of the progressive local forging and bending forming mold will remain unchanged. Therefore, the mold structure of progressive local forging and bending forming has the advantage of not being limited by the size of the component, and truly realizes the ability of small-size molds to prepare large and complex components. The front hydraulic cylinder 4 and the rear hydraulic cylinder 7 provide blanking force through the front blanking punch 3 and the rear blanking punch 8 during the forming process, which limits the lateral flow of the material and avoids the occurrence of rib-penetration defects. The use of inner bending rollers 9 and outer bending rollers 10 solves the problems of large bending forming force of the component and large bending mold structure, and realizes local progressive bending of the U-shaped connector. At the same time, the inner bending rollers 9 and outer bending rollers 10 can provide axial constraints, limit the axial deformation of the component, and solve the deformation instability problem caused by uneven deformation inside and outside the component during the bending process.

[0056] Compared with the prior art, the present invention divides the overall / local forging and overall stretch-bending processes into multiple local closed forging-bending processes, greatly reducing the overall mold size and manufacturing cycle, and realizing the ability of a small-tonnage press and an overall small-specification mold to prepare U-shaped connectors in a short process, significantly reducing the production cost of the components and improving the manufacturing efficiency of the components, and avoiding the problem of multiple heating of the blanks between multiple processes; first, this process solves the problems of lateral flow of materials and local warping during local forging by setting a front pressing punch and a rear pressing punch; secondly, this process solves the problems of deformation instability caused by uneven deformation of the inner and outer sides of the components during local bending by setting an I-shaped structure inner bending roller and an outer bending roller; the above invention significantly improves the forming performance, forming accuracy and manufacturing efficiency of the U-shaped connector.

[0057] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A U-shaped connector progressive local forging and bending forming die, characterized in that: include: A die, a front edge pressing punch, a forming punch, a rear edge pressing punch arranged in sequence inside the die, and a bending control device arranged at the end of the die, wherein: the upper die plate drives the front edge pressing punch and the rear edge pressing punch through the front hydraulic cylinder and the rear hydraulic cylinder respectively and drives the forming punch to press down, and the blank is input from one side of the head end of the die and intermittently output to the bending control device at the end; The bending control device comprises: a rotating base, a pair of main control arms arranged thereon, corresponding auxiliary control arms connected thereto, and an inner bending roller and an outer bending roller respectively arranged vertically between the pair of main control arms and the auxiliary control arms.

2. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: The inner bending roller and the outer bending roller are matched with the upper auxiliary control arm and the lower auxiliary control arm through the shaft sleeve structure.

3. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: The inner bending roller and the outer bending roller revolve around the rotating base. The orbital radius of the inner bending roller and the outer bending roller is controlled by the rotating base by adjusting the length of the upper main control arm and the lower main control arm according to the curvature radius of the target component to achieve bending forming of the component.

4. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: The inner bending roller and the outer bending roller both adopt an I-section shaft sleeve structure. The semi-enclosed shape of the combination of the two matches the outer contour of the component, solving the deformation instability problem caused by uneven deformation inside and outside the component during bending. The spacing between the inner bending roller and the outer bending roller can be determined by adjusting the length of the upper auxiliary control arm and the lower auxiliary control arm, and both can rotate around the central axis to achieve the effect of replacing static friction with dynamic friction, solving the scratches on the surface of the profile during bending.

5. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: The strokes of the front hydraulic cylinder and the rear hydraulic cylinder are greater than or equal to the pressing amount of a single blank; there is a height difference between the bottom of the front edge pressing punch and the bottom of the rear edge pressing punch, and the height difference is equal to the pressing amount of a single blank.

6. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: The working surfaces of the front edge pressing punch, the forming punch and the rear edge pressing punch are the same; the forming punch is located between the front edge pressing punch and the rear edge pressing punch, and there is a gap between adjacent molds.

7. The U-shaped connector progressive partial forging and bending forming die according to claim 1, characterized in that: A feeding device is provided on the front side of the die to realize horizontal quantitative movement of the blank. The feeding distance is the spacing between adjacent web reinforcement ribs of the U-shaped connector to prevent the forming punch and the rear edge pressing punch from pressing the web reinforcement ribs of the U-shaped connector.

8. A method for progressive partial forging and bending of a U-shaped connector based on the die of any one of claims 1 to 7, characterized in that: include: Step 1: Clamp the end of the blank away from the die through the feeding device and push the blank through the input end of the die to the bottom of the forming punch, start the press and run it downward through the upper die plate until the front edge pressing punch contacts the blank; Step 2: The press continues to move downward until the forming punch contacts the blank. During this process, the front hydraulic cylinder is pushed back, and the front blanking punch continues to output a blanking force to the blank. Step 3: The press moves downward again, and the forming punch partially loads the blank to complete the first step of forming the blank. The front hydraulic cylinder continues to push back, and the front blanking punch continues to output the blanking force. Step 4: The press returns, and the front hydraulic cylinder pushes out; after the press returns, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed. The moving distance of the blank is determined according to the spacing between the adjacent web stiffeners of the U-shaped connector; Step 5, after the feeding is completed, the press moves downward again, and the front edge pressing punch contacts the blank again through the action of the downward movement of the press, and the rear edge pressing punch contacts the formed area at the same time; the press continues to move downward until the forming punch contacts the blank, and during this process, the front hydraulic cylinder and the rear hydraulic cylinder continue to push back, and the front edge pressing punch and the rear edge pressing punch continue to apply the edge pressing force to the undeformed area and the deformed area of ​​the blank respectively; the press continues to move downward, and the forming punch locally loads the blank to deform the material, completing the second step of forming; Step 6: The press returns, and the front hydraulic cylinder and the rear hydraulic cylinder are pushed out; after the press returns, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed; Step 7, the press moves downward, and the front and rear edge-holding punches respectively apply edge-holding forces to the undeformed area and the formed area of ​​the component under the action of the front and rear hydraulic cylinders; the press continues to move downward, and the forming punch approaches the blank to form the blank below. During this process or after the forming punch completes the blank forming, the bending control device is turned on, and the inner bending roller and the outer bending roller bend the formed component under the action of the bending control device; Step 8: During the return stroke of the press, the front hydraulic cylinder and the rear hydraulic cylinder are pushed out, and the inner bending roller and the outer bending roller are controlled by the bending control device to return to their original positions; after the return stroke of the press is completed, the feeding device is started, and the blank is quantitatively moved to the next area to be deformed; Step 9: Repeat steps 7 and 8 until all the ribs of the U-shaped connector are formed and the bending of the component is achieved.

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