Rigid and flexible combined pressure plate, manufacturing and debugging method and flanging die

Abstract

The invention discloses a rigid and flexible combined material pressing plate, a manufacturing and debugging method and a flanging die. The material pressing plate comprises a material pressing plate base body, a rubber material pressing block and a steel material pressing block, and the rubber material pressing block and the steel material pressing block are detachably arranged on the material pressing plate base body; and the steel pressing block is arranged in a reinforced pressing area corresponding to the upwarp area of the flanging of the workpiece. The material pressing plate has the advantages that the material pressing plate adopts a rigid-flexible material pressing structure, the rubber material pressing block is arranged in the flexible material pressing area, the steel material pressing block is arranged in the reinforced material pressing area, the material pressing force can be increased, the requirement for large material pressing force of the corner flanging is met, and the problem that the material pressing force of the rubber material pressing surface of the reinforced material pressing area is insufficient is solved; the problem that the turned-over edge of the sharp corner of the workpiece is upwarped can be solved, the debugging and repairing efficiency can be improved, and the project debugging cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of flanging dies, and in particular to a rigid and flexible pressing plate, a manufacturing and debugging method, and a flanging die. Background Art

[0002] At present, in stamping die, the steel pressing plate is difficult to improve in terms of quality and efficiency due to the problems that the coloring of the steel pressing plate is difficult to adjust to uniformity, and it is greatly affected by the press, the defects such as padding chips, zinc padding chips, dirty spots, indentations, etc. cannot be completely eliminated, and the commissioning and research of new projects consumes huge manpower and material resources. Therefore, at present, both at home and abroad, attempts are being made to change the contact surface of the rigid pressing plate to a flexible pressing plate, and the use of rubber materials to replace rigid materials has become an improvement trend in stamping die technology. The rubber pressing plate can be successfully switched to use on the trimming process die, but in the application process of the flexible pressing plate of the flanging die, difficulties are generally encountered. After the flanging process, the parts have surface quality problems such as Class B defects and rebound problems that cannot be solved by the rubber pressing plate. These unsolvable problems restrict the batch application of flexible pressing plates. For example, after the sharp corners of the left and right front door outer panels near the door handle are flanging, the sharp corners are warped, and the sharp corners cannot be eliminated by adjusting the hardness and compression of the rubber pressing plate. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present invention provides a rigid and flexible pressing plate, a manufacturing and debugging method and a flanging mold. The pressing plate is provided with a steel pressing block in a reinforced pressing area corresponding to the upturned area of ​​the flanging of the workpiece, and the rubber pressing block is combined with the steel pressing block to compensate for the problem of insufficient strength of the rubber pressing block.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A rigid and flexible pressing plate comprises a pressing plate base, a rubber pressing block and a steel pressing block, wherein the rubber pressing block and the steel pressing block are detachably arranged on the pressing plate base; the steel pressing block is arranged in a reinforced pressing area corresponding to the upturned area of ​​the flange of the workpiece.

[0006] Furthermore, the rubber pressing block includes multiple flexible pressing areas arranged outside the reinforced pressing area of ​​the pressing plate base; each of the rubber pressing blocks includes a rubber pressing part and a first insert, the rubber pressing part is fixedly arranged on the first insert, and the first insert is connected to the pressing plate base through a first screw, so that the rubber pressing plate adopts a split structure, and the pressing surface pressure of the pressing plate can be locally adjusted.

[0007] Furthermore, the rubber pressing part is fixedly arranged on the first insert by casting, and a threaded screw is arranged between the rubber pressing part and the first insert to improve the connection strength between the rubber pressing part and the first insert.

[0008] Furthermore, the rubber pressing block is also provided with a first positioning pin; the pressing plate base is provided with a first positioning hole, and the first insert is provided with a second positioning hole matched with the first positioning hole; the first positioning pin is inserted into the second positioning hole and the first positioning hole in sequence, so that the pressing surface of the rubber pressing block is fixed to the position of the pressing plate base accurately.

[0009] Furthermore, the steel pressing block includes a rigid pressing part and a second insert, the rigid pressing part is fixedly arranged on the second insert, and the second insert is connected to the pressing plate base through a second screw; or the second insert is connected to the first insert located in the reinforced pressing area through a second screw.

[0010] Furthermore, a long strip notch is provided in the rubber pressing part corresponding to the sharp corner of the workpiece, and the rigid pressing part is arranged in the notch, and the long strip pressing surface of the rigid pressing part is flush with the long strip pressing surface of one side of the rubber pressing part corresponding to the sharp corner of the workpiece; preferably, the length of the notch includes 10-100mm, and the width includes 10-20mm.

[0011] Furthermore, the steel pressure block is also provided with a second positioning pin; the pressure plate base or the first insert is provided with a third positioning hole, and the second insert is provided with a fourth positioning hole matched with the third positioning hole; the second positioning pin is inserted into the fourth positioning hole and the third positioning hole in sequence, so that the pressure surface of the steel pressure block is fixed to the position of the pressure plate base accurately.

[0012] Furthermore, a method for making and debugging a rigid and flexible press plate is provided, which is used to make and debug the press plate described in any one of the above items, and the method comprises the following steps:

[0013] Step 1: The working surface of the pressing plate is entirely made of rubber pressing blocks, and the workpiece is flanging and pressing. By adjusting the compression amount of the rubber pressing block to X1 and the pressing force of the mold to F1, the size and surface of the workpiece meet the requirements;

[0014] Step 2: After the flanging work, determine the upturned area of ​​the sharp corner of the workpiece, determine the pressing surface corresponding to the upturned area of ​​the sharp corner of the workpiece as the strengthened pressing area, and measure the length L1 and width L2 of the upturned area of ​​the sharp corner of the workpiece;

[0015] Step 3, cutting off the rubber pressing block in the reinforced pressing area, and forming a notch at the location where the rubber pressing block is cut off, wherein the length of the notch is set to 1-10 times of L1, and the width is set to 1-2 times of L2;

[0016] Step 4: Set a steel pressing block at the notch;

[0017] Step 5: Apply coloring oil on the pressing area of ​​the workpiece, debug and repair the steel pressing block, adjust the pressing force of the mold to F1, the compression amount of the rubber pressing block to X1, and perform flanging on the workpiece;

[0018] Step 6, observe the state of the coloring oil in the area where the steel press block presses after the workpiece has been flanging: when the color change rate of the coloring oil in the area where the steel press block presses is greater than or equal to 80%, it indicates that the steel press block has passed the repair; otherwise, repeat step 5 to debug and repair the steel press block until the steel press block has passed the repair.

[0019] Furthermore, a flanging mold with a pressing plate that combines rigidity and flexibility includes the pressing plate described in any of the above items, the flanging mold includes an upper mold and a lower mold, the pressing plate is arranged on the upper mold, each side of the lower mold is provided with at least two precision positioning pins, the pressing plate is provided with a first avoidance hole adapted to each precision positioning pin to ensure the stability of the part forming process.

[0020] Furthermore, the precision positioning pin includes a hole positioning pin and an L-shaped positioning pin, the hole positioning pin is arranged on the punch of the lower mold, and the L-shaped positioning pin is arranged on the pressing ring of the lower mold.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The pressing plate adopts a rigid and flexible pressing structure. A rubber pressing block is set in the flexible pressing area, and a steel pressing block is set in the reinforced pressing area. This can increase the pressing force to meet the demand for large pressing force of the corner flanging and make up for the problem of insufficient pressing force of the rubber pressing surface in the reinforced pressing area. It can not only solve the problem of warping of the sharp corner flanging of the workpiece, but also improve the debugging and repair efficiency and save the project debugging cost.

[0023] (2) The various pressing blocks of the pressing plate adopt a split structure, and the pressing surface pressure of each rubber pressing block and steel pressing block can be adjusted locally separately, solving the problem of insufficient local pressure on the flexible pressing surface. The operation is simple and convenient, the debugging efficiency is high, and the surface quality of the workpiece can be better improved.

[0024] (3) At least two precision positioning pins are provided on each side of the lower mold of the flanging mold, so that the flanging mold adopts all-round precise positioning and establishes a high-precision "precision positioning system", which ensures that the workpiece does not move during the flexible pressing process, improves the stability of the part forming process, and thus ensures the accuracy and stability of the part size. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0026] Figure 1 It is a schematic diagram of the structure of the rigid and flexible pressing plate of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the pressing block of the pressing plate combining rigidity and flexibility of the present invention.

[0028] Figure 3 It is a schematic diagram of the rigid-flexible pressing block structure of the present invention.

[0029] Figure 4 It is an exploded view of the rigid-flexible pressing block of the present invention.

[0030] Figure 5 It is a schematic diagram of the lower mold structure of the flanging mold of the present invention.

[0031] Figure 6 This is a schematic diagram of an enlarged view of A.

[0032] In the figure: 1-pressing plate; 11-pressing plate base; 12-rubber pressing block; 121-rubber pressing part; 1211-notch; 1212-second avoidance hole; 1213-third avoidance hole; 122-first insert; 1221-second positioning hole; 1222-first through hole; 1223-accommodating cavity; 13-steel pressing block; 131-rigid pressing part; 132-second insert; 1321-fourth positioning hole; 1322-second through hole; 2-lower mold; 21-punch; 22-pressing ring; 23-precision positioning pin; 231-hole positioning pin; 232-L-type positioning pin. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0034] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] The edges are narrow and thin, the angle between the pressing surface and the horizontal plane is large, and the strength of the rubber pressing plate at the sharp corners of the corresponding parts is weak. The pressing force is insufficient when pressing on the corner slope, and it cannot play an effective pressing role after being subjected to lateral force. The corners are prone to flanging and warping, resulting in unsolvable surface Class B defects.

[0036] In order to eliminate the defect of sharp corner flange warping, the present invention provides a rigid and flexible press plate, referring to Figure 1 and Figure 2 As shown, it includes a pressing plate base 11, a rubber pressing block 12 and a steel pressing block 13, wherein the rubber pressing block 12 and the steel pressing block 13 are detachably arranged on the pressing plate base 11; the steel pressing block 13 is arranged in the reinforced pressing area corresponding to the upturned area of ​​the workpiece. The pressing surface of the pressing plate 1 corresponding to the upturned area of ​​the flanging is set as the reinforced pressing area, and the other pressing surfaces are set as the flexible pressing area. The rubber pressing block 12 is set in the flexible pressing area, and the steel pressing block 13 is set in the reinforced pressing area. In this way, the area of ​​the flexible pressing surface corresponding to the rubber pressing block 12 is large, which is easy to color, debug and repair, while the steel pressing block 13 can increase the pressing force to meet the demand for large pressing force of the corner flanging, and make up for the problem of insufficient pressing force of the rubber pressing surface in the reinforced pressing area. At the same time, the area of ​​the rigid pressing surface corresponding to the steel pressing block 13 is very small, which is easy to color, debug and repair. The pressing plate 1 uses a rigid and flexible pressing structure. Compared with a rubber pressing plate, it can solve the problem of the sharp corners of the workpiece flanging and eliminate the corner warping type B defect; compared with a steel pressing plate, it can improve the debugging and repair efficiency and basically eliminate defects such as chip indentation.

[0037] In one embodiment, the rubber pressing block 12 includes a plurality of flexible pressing areas arranged outside the reinforced pressing area of ​​the pressing plate substrate 11. Figure 2 As shown, each of the rubber pressing blocks 12 includes a rubber pressing portion 121 and a first insert 122, wherein the rubber pressing portion 121 is fixedly arranged on the first insert 122, and the first insert 122 is connected to the pressing plate base 11 via a first screw. In this way, the rubber pressing blocks 12 and the pressing plate base 11 are detachably arranged, and each of the rubber pressing blocks 12 is arranged in a split type, and each of the rubber pressing blocks 12 can be individually disassembled.

[0038] The rubber pressing part 121 is made of resin material, and the first insert 122 can use a steel block. In order to firmly fix the rubber pressing part 121 to the first insert 122, the rubber pressing part 121 is fixed to the first insert 122 by casting, and a threaded screw is provided between the rubber pressing part 121 and the first insert 122. Specifically, a threaded screw can be pre-set on one side of the first insert 122 where the rubber pressing part 121 is provided, and the resin material is cast on the first insert 122 to form the rubber pressing part 121. After casting, the rubber pressing part 121 is connected to the first insert 122 and the threaded screw, and the connection strength between the rubber pressing part 121 and the first insert 122 is high.

[0039] In order to make the rubber pressing block 12 fixed to the pressing plate base 11 accurately, the rubber pressing block 12 is also provided with a first positioning pin; the pressing plate base 11 is provided with a first positioning hole, and the first insert 122 is provided with a second positioning hole 1221 adapted to the first positioning hole; the first positioning pin is inserted into the second positioning hole 1221 and the first positioning hole in sequence. The first positioning pin can prevent the position of the rubber pressing block 12 from being offset when it is fixed to the pressing plate base 11, so that the position of the pressing surface of the rubber pressing block 12 is accurate. Preferably, each rubber pressing block 12 can be provided with a plurality of first positioning pins and a plurality of first screws, and correspondingly, the first insert 122 is provided with the same number of second positioning holes 1221 and first through holes 1222 for the first screws to pass through, so that the rubber pressing block 12 is firmly connected to the pressing plate base 11, and can also prevent the rubber pressing block 12 from moving and rotating during installation, so that the position of the longer rubber pressing block 12 is still accurate when it is fixed to the pressing plate base 11. When the rubber pressing block 12 is wider and the second positioning hole 1221 and the first through hole 1222 are arranged on the first insert 122 below the rubber pressing portion 121 , a second avoidance hole 1212 and a third avoidance hole 1213 for avoiding the first positioning pin and the first screw respectively can be arranged on the rubber pressing portion 121 .

[0040] In one embodiment, reference Figure 3 and Figure 4As shown, the steel pressing block 13 includes a rigid pressing part 131 and a second insert 132, and the rigid pressing part 131 is fixedly arranged on the second insert 132. Preferably, the rigid pressing part 131 and the second insert 132 are arranged in an integrated manner, and the pressing force of the rigid pressing part 131 and the pressing force of the adjacent rubber pressing part 121 can be uniformly transferred through coloring, debugging and research, so as to avoid the quality defects of the product. When the steel pressing block 13 is relatively large, the second insert 132 can be directly connected to the pressing plate base 11 through the second screw; when the steel pressing block 13 is relatively narrow and long, the second insert 132 is connected to the first insert 122 located in the reinforced pressing area through the second screw, that is, the steel pressing block 13 is arranged on the rubber pressing block 12 with insufficient pressing force, which can improve the strength of the steel pressing block 13, and the pressing block forms a rigid and flexible pressing block. During installation, the steel pressing block 13 may be first fixed to the rubber pressing block 12 , and then the rubber pressing block 12 may be fixed to the pressing plate base 11 .

[0041] Each pressing block of the pressing plate 1 adopts a split structure, and the pressing surface pressure of each rubber pressing block 12 and steel pressing block 13 can be adjusted locally and individually, which is simple and convenient to operate; it can also better improve the surface quality of the workpiece, and can reduce the dimensional rebound of the workpiece compared to the rubber pressing plate. For example, when the left and right front door outer panels are flanging with a rubber pressing plate, the dimensional rebound of the workpiece near the A-pillar side is large, and most of the dimensional rebound exceeds 2.5mm. When the rigid and flexible pressing plate 1 is flanging, the local pressing force is adjusted separately. After the strong pressure compensation is performed locally on the pressing plate 1, the dimensional rebound of the workpiece near the A-pillar side is controlled within 0.5mm, meeting the vehicle matching requirements.

[0042] When the steel pressing block 13 is arranged on the rubber pressing block 12, Figure 3 and Figure 4As shown, a long strip notch 1211 can be provided in the rubber pressing part 121 corresponding to the sharp corner of the workpiece, and the rigid pressing part 131 is provided in the notch 1211, and the long strip pressing surface of the rigid pressing part 131 is flush with the long strip pressing surface of one side of the rubber pressing part 121 corresponding to the sharp corner of the workpiece. A receiving cavity 1223 for receiving the second insert 132 is provided in the first insert 122, and the second insert 132 is fixed in the receiving cavity 1223. The size of the notch 1211 can be set according to the size of the sharp corner upturned area. Preferably, the length of the notch 1211 includes 10-100mm, and the width includes 10-20mm, that is, the length of the long strip pressing surface of the rigid pressing part 131 includes 10-100mm, and the width includes 10-20mm. That is, the length of the long strip pressing surface of the rigid pressing part 131 includes 10-100mm, and the width includes 10-20mm. For example, the length of the notch 1211 can be set to 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc., and the width can be set to 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0043] In order to accurately fix the steel pressing block 13 to the pressing plate base 11, the steel pressing block 13 is also provided with a second positioning pin; the pressing plate base 11 or the first insert 122 is provided with a third positioning hole, and the second insert 132 is provided with a fourth positioning hole 1321 that matches the third positioning hole; the second positioning pin is inserted into the fourth positioning hole 1321 and the third positioning hole in sequence. The second positioning pin can prevent the steel pressing block 13 from being offset when it is directly fixed to the pressing plate base 11 or fixed to the pressing plate base 11 through the first insert 122, so that the pressing surface of the steel pressing block 13 is accurately positioned. The length of the steel pressing block 13 is relatively small. Preferably, the steel pressing block 13 can use a second positioning pin and two second screws to connect the steel pressing block 13 with the first insert 122. Accordingly, the second insert 132 is provided with a fourth positioning hole 1321 and two second through holes 1322 for the second screws to pass through, so that the second insert 132 is firmly connected to the pressing plate base 11 or the first insert 122, and can also prevent the steel pressing block 13 from moving and rotating during installation.

[0044] The present invention also provides a method for manufacturing and debugging a rigid and flexible press plate, which is used to manufacture and debug the press plate 1 described in any one of the above items, and the method comprises the following steps:

[0045] Step 1: The working surface of the pressing plate 1 is entirely covered with rubber pressing blocks 12 to perform flanging and pressing of the workpiece. By adjusting the compression amount of the rubber pressing block 12 to X1 and the pressing force of the mold to F1, the size and surface of the workpiece meet the requirements.

[0046] Step 2: After the flanging work, determine the upturned area of ​​the sharp corner of the workpiece, determine the pressing surface corresponding to the upturned area of ​​the sharp corner of the workpiece as the strengthened pressing area, and measure the length L1 and width L2 of the upturned area of ​​the sharp corner of the workpiece;

[0047] Step 3, the rubber pressing block 12 of the reinforced pressing area is cut off, and a notch 1211 is formed at the part where the rubber pressing block 12 is cut off, wherein the length of the notch 1211 is set to 1-10 times of L1, and the width is set to 1-2 times of L2;

[0048] Step 4, setting a steel pressing block 13 at the notch 1211;

[0049] Step 5: Apply coloring oil on the pressing area of ​​the workpiece, debug and repair the steel pressing block 13, adjust the pressing force of the mold to F1, the compression amount of the rubber pressing block 12 to X1, and perform flanging on the workpiece;

[0050] Step 6, observe the state of the coloring oil in the area pressed by the steel pressing block 13 after the workpiece has been flanging: when the color change rate of the coloring oil in the area pressed by the steel pressing block 13 is greater than or equal to 80%, it indicates that the steel pressing block 13 has passed the repair; otherwise, repeat step 5 to debug and repair the steel pressing block 13 until the steel pressing block 13 has passed the repair.

[0051] When making and debugging the rigid-flexible pressing plate 1, it is necessary to first confirm the distribution of the reinforced pressing area and the flexible pressing area, that is, confirm the position of the steel pressing block 13. Step 1 can be debugged and repaired according to the debugging method of the ordinary rubber pressing plate. After the workpiece is verified by the whole vehicle assembly, confirm the compression amount X1 of the rubber and the pressing force F1 of the mold when the size and surface of the workpiece meet the requirements. After flanging according to the compression amount X1 and the pressing force F1 of the mold, the upturned area of ​​the sharp corner of the workpiece is determined through multiple tests and verifications, and the pressing surface corresponding to the upturned area of ​​the sharp corner of the workpiece is determined as the reinforced pressing area. Then measure the length L1 and width L2 of the upturned area of ​​the sharp corner of the workpiece, and set the size of the length L1 and width L2 after expanding a certain margin as the size of the reinforced pressing area, and the other pressing surfaces are retained as flexible pressing areas. Then, the rubber pressing block 12 in the reinforced pressing area is cut off to form a notch 1211, and a steel pressing block 13 is set at the notch 1211, that is, the steel pressing block 13 replaces part of the rubber pressing block 12 to complete the production of the rigid-flexible pressing plate 1. Then, step 5 and step 6 are performed to debug and train the steel pressing block 13 until the steel pressing block 13 passes the training. The rigid pressing surface area of ​​the steel pressing block 13 is small, and the coloring debugging and training are easier. Compared with the steel pressing plate, the coloring rate of the rigid-flexible pressing plate 1 can be increased from 80% to 95%, the training time is reduced by 85%, and the debugging efficiency is high.

[0052] The size of the notch 1211 needs to ensure that the area of ​​the rigid pressing surface is sufficient to provide the pressing force, and on the other hand, it needs to avoid the area of ​​the rigid pressing surface being too large, which increases the difficulty of debugging and repairing, and increases the risk of foreign matter such as padding scraps causing defects in the product during repairing. It also needs to meet the installation size requirements of the second screw and the second positioning pin, and the notch 1211 needs to be set to a suitable size. Preferably, the length of the notch 1211 is set to 1-10 times of L1, and the width is set to 1-2 times of L2. When the sharp-angled upturned area of ​​the workpiece is larger, the size of the notch 1211 can be equal to the size of the sharp-angled upturned area; when the sharp-angled upturned area of ​​the workpiece is narrower and longer, the length of the notch 1211 can be set to 2 times, 3 times, 4 times, 5 times, 6 times, 7 times, 8 times, 9 times, 10 times, etc., of the length L1 of the sharp-angled upturned area of ​​the workpiece, and the width of the notch 1211 can be set to 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, etc. of the width L2 of the sharp-angled upturned area of ​​the workpiece.

[0053] For example, after the left and right front door outer panels are flanging, the sharp corners near the door handle are tilted upward, and the pressing surface corresponding to this area is determined as the reinforced pressing area. The length L1 of the sharp corner tilting area is 10mm, and the width L2 is 9mm. The length of the notch 1211 is set to 66mm, and the width is set to 13mm, that is, the length of the pressing surface of the steel pressing block 13 is 66mm, and the width is 13mm. After the size of the sharp corner tilting area is enlarged by a certain margin, the rigid pressing part 131 is strong enough and not easy to be damaged. The pressing force is increased during flanging, which can eliminate the problem of the sharp corner tilting near the door handle, making the sharp corner of the surface of the workpiece smooth, and the second insert 132 also has enough positions for installing the second screw and the second positioning pin.

[0054] The present invention also provides a flanging die with a rigid and flexible pressing plate, comprising the pressing plate 1 described in any one of the above, the flanging die comprising an upper die and a lower die 2, the pressing plate 1 being arranged on the upper die, at least two precision positioning pins 23 being arranged on each side of the lower die 2, the pressing plate 1 being provided with a first avoidance hole adapted to each precision positioning pin 23, to prevent interference between the pressing plate 1 and each precision positioning pin 23 during pressing. Preferably, each precision positioning pin 23 can be arranged at the four corners and the middle of the lower die 2.

[0055] Although the pressing plate 1 is provided with a steel pressing block 13, most of the pressing surface is still a rubber pressing surface, which is easy to slip during the pressing process. In order to ensure that the workpiece does not move during the flexible pressing process, at least two precision positioning pins 23 can be provided on each side of the lower mold 2, and the positioning accuracy of each precision positioning pin 23 is not greater than 0.2mm. Compared with traditional molds that use 1-2 points to achieve precision positioning, the flanging mold uses all-round precision positioning and establishes a high-precision "precision positioning system", which can ensure the stability of the workpiece molding process, thereby ensuring the accuracy and stability of the workpiece size and ensuring the stability of mass production.

[0056] Specifically, the precision positioning pin 23 includes a hole positioning pin 231 and an L-shaped positioning pin 232, wherein the hole positioning pin 231 is arranged on the punch 21 of the lower mold 2, and the L-shaped positioning pin 232 is arranged on the pressing ring 22 of the lower mold 2. During the flanging operation, the hole positioning pin 231 passes through the positioning hole of the workpiece, and the L-shaped positioning pin 232 clamps the workpiece, which can better prevent the workpiece from moving during the pressing process, offset the lateral force, and stabilize the workpiece forming process. For example, when the left front door outer panel of the vehicle adopts two precision positioning points, the surface dimension fluctuation of 50% of the workpiece after flanging is about 0.81mm, which exceeds the tolerance value of the workpiece by 0.5mm; after adopting the precision positioning system, the maximum fluctuation of the surface dimension of the vehicle front door outer panel after flanging is about 0.3mm, and the surface fluctuation dimension is within the tolerance value of 0.5mm, which ensures the dimensional accuracy and stability of the workpiece.

[0057] The pressing plate 1 adopts a rigid and flexible pressing structure, with a rubber pressing block 12 set in the flexible pressing area and a steel pressing block 13 set in the reinforced pressing area, which can increase the pressing force, meet the demand for large pressing force at the corner flanging, and make up for the problem of insufficient pressing force on the rubber pressing surface in the reinforced pressing area. It can not only solve the problem of the sharp corner flanging of the product, but also improve the debugging and repair efficiency and save the project debugging cost. The various pressing blocks of the pressing plate 1 adopt a split structure, and the pressing surface pressure of each rubber pressing block 12 and steel pressing block 13 can be adjusted locally separately, solving the problem of insufficient local pressure on the flexible pressing surface. The operation is simple and convenient, the debugging efficiency is high, and the surface quality of the product can be better improved. The pressing plate 1 has a wide range of applications and can be applied to the left and right front door outer panel flanging molds. It can be simply modified on the existing rubber pressing plate, and can also be promoted and applied in other mechanical manufacturing or industrial production fields involving rubber pressurization structures.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rigid and flexible press plate, characterized in that: It comprises a pressing plate base, a rubber pressing block and a steel pressing block, wherein the rubber pressing block and the steel pressing block are detachably arranged on the pressing plate base; and the steel pressing block is arranged in a reinforced pressing area corresponding to the upturned area of ​​the workpiece flanging.

2. The rigid and flexible press plate according to claim 1, characterized in that: The rubber pressing block includes multiple flexible pressing areas arranged outside the reinforced pressing area of ​​the pressing plate base; each of the rubber pressing blocks includes a rubber pressing part and a first insert, the rubber pressing part is fixedly arranged on the first insert, and the first insert is connected to the pressing plate base through a first screw.

3. The rigid and flexible press plate according to claim 2, characterized in that: The rubber pressing part is fixedly arranged on the first insert by casting, and a thread-setting screw is arranged between the rubber pressing part and the first insert.

4. The rigid and flexible press plate according to claim 2, characterized in that: The rubber pressing block is also provided with a first positioning pin; the pressing plate base is provided with a first positioning hole, and the first insert is provided with a second positioning hole matched with the first positioning hole; the first positioning pin is inserted into the second positioning hole and the first positioning hole in sequence.

5. The rigid and flexible press plate according to claim 2, characterized in that: The steel pressing block includes a rigid pressing portion and a second insert, wherein the rigid pressing portion is fixedly arranged on the second insert, and the second insert is connected to the pressing plate base through a second screw; or the second insert is connected to the first insert located in the reinforced pressing area through a second screw.

6. The rigid and flexible press plate according to claim 5, characterized in that: The rubber pressing part corresponding to the sharp corner of the workpiece is provided with a long strip notch, and the rigid pressing part is arranged in the notch. The long strip pressing surface of the rigid pressing part is flush with the long strip pressing surface of one side of the rubber pressing part corresponding to the sharp corner of the workpiece; preferably, the length of the notch includes 10-100mm, and the width includes 10-20mm.

7. The rigid and flexible press plate according to claim 5, characterized in that: The steel pressing block is also provided with a second positioning pin; the pressing plate base or the first insert is provided with a third positioning hole, and the second insert is provided with a fourth positioning hole matched with the third positioning hole; the second positioning pin is inserted into the fourth positioning hole and the third positioning hole in sequence.

8. A method for manufacturing and debugging a rigid and flexible press plate, used for manufacturing and debugging the press plate according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Step 1: The working surface of the pressing plate is entirely made of rubber pressing blocks, and the workpiece is flanging and pressing. By adjusting the compression amount of the rubber pressing block to X1 and the pressing force of the mold to F1, the size and surface of the workpiece meet the requirements; Step 2: After the flanging work, determine the upturned area of ​​the sharp corner of the workpiece, determine the pressing surface corresponding to the upturned area of ​​the sharp corner of the workpiece as the strengthened pressing area, and measure the length L1 and width L2 of the upturned area of ​​the sharp corner of the workpiece; Step 3, cutting off the rubber pressing block in the reinforced pressing area, and forming a notch at the location where the rubber pressing block is cut off, wherein the length of the notch is set to 1-10 times of L1, and the width is set to 1-2 times of L2; Step 4: Set a steel pressure block at the notch; Step 5: Apply coloring oil on the pressing area of ​​the workpiece, debug and repair the steel pressing block, adjust the pressing force of the mold to F1, the compression amount of the rubber pressing block to X1, and perform flanging on the workpiece; Step 6, observe the state of the coloring oil in the area where the steel press block presses after the workpiece has been flanging: when the color change rate of the coloring oil in the area where the steel press block presses is greater than or equal to 80%, it indicates that the steel press block has passed the repair; otherwise, repeat step 5 to debug and repair the steel press block until the steel press block has passed the repair.

9. A flanging die having a rigid and flexible pressing plate, comprising the pressing plate according to any one of claims 1 to 7, characterized in that: The flanging die comprises an upper die and a lower die, the pressing plate is arranged on the upper die, at least two precision positioning pins are arranged on each side of the lower die, and the pressing plate is provided with a first avoidance hole adapted to each precision positioning pin.

10. The flanging die according to claim 9, characterized in that: The precision positioning pin includes a hole positioning pin and an L-shaped positioning pin. The hole positioning pin is arranged on the punch of the lower mold, and the L-shaped positioning pin is arranged on the pressing ring of the lower mold.

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