A rigid and flexible combined pressure plate, manufacturing and debugging method and flanging die

Abstract

The application discloses a kind of rigid and flexible combination's material pressing plate, production and debugging method and flanging die, the material pressing plate includes material pressing plate matrix, rubber pressing block and steel pressing block, the rubber pressing block and steel pressing block can be detachably set in material pressing plate matrix;The steel pressing block is set in the reinforcing pressing area corresponding to the upwarping area of the workpiece flanging.This material pressing plate adopts rigid and flexible combination's pressing structure, sets rubber pressing block in flexible pressing area, sets steel pressing block in reinforcing pressing area, can increase pressing force, meet the demand of corner flanging large pressing force, make up the problem of insufficient pressing force of rubber pressing surface in reinforcing pressing area, not only can solve the problem of workpiece sharp corner flanging upwarping, but also can improve debugging efficiency, save project debugging cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flanging die, in particular to a rigid and flexible combined pressure plate, a manufacturing and debugging method and a flanging die. BACKGROUND

[0002] At present, in the stamping die, due to the coloring of the steel pressure plate, it is difficult to adjust to uniformity, and the defects such as pad scrap, pad zinc scrap, dirty point, indentation and the like cannot be completely eliminated, and the new project debugging and research consumes a lot of manpower and material resources, and the steel pressure plate is difficult to improve in quality and efficiency. Therefore, at present, the contact surface of the steel pressure plate is changed to flexible pressure plate at home and abroad, and the use of rubber material instead of steel material has become an improvement trend of stamping die technology. The rubber pressure plate can be successfully switched in the trimming process die, but in the application process of the flexible pressure plate of the flanging die, the B class defects and other surface quality problems and the springback problem of the workpiece after the flanging process cannot be solved by the rubber pressure plate, which restricts the batch application of the flexible pressure plate. For example, after the sharp corner of the left and right front door outer plate near the door handle is flanged, the sharp corner upwarping problem occurs, and the sharp corner upwarping problem cannot be eliminated by adjusting the hardness and compression amount of the rubber pressure plate. SUMMARY

[0003] In order to solve at least one of the above technical problems, the present application provides a rigid and flexible combined pressure plate, a manufacturing and debugging method and a flanging die, the steel pressure block is arranged in the reinforced pressure area corresponding to the upwarping area of the workpiece, and the combination of the rubber pressure block and the steel pressure block can make up for the insufficient strength of the rubber pressure block.

[0004] The technical problems solved by the present application adopt the following technical solutions:

[0005] A rigid and flexible combined pressure plate, comprising a pressure plate base body, a rubber pressure block and a steel pressure block, the rubber pressure block and the steel pressure block are detachably arranged on the pressure plate base body; the steel pressure block is arranged in the reinforced pressure area corresponding to the upwarping area of the workpiece.

[0006] Further, the rubber pressure block comprises a plurality of rubber pressure blocks arranged in the flexible pressure area outside the reinforced pressure area of the pressure plate base body; each rubber pressure block comprises a rubber pressure part and a first insert block, the rubber pressure part is fixedly arranged on the first insert block, and the first insert block is connected to the pressure plate base body by a first screw, so that the rubber pressure plate adopts a split structure, and the pressure surface pressure of the pressure plate can be locally adjusted.

[0007] Further, the rubber pressure material part is fixedly arranged on the first insert by pouring, and a wire screw is arranged between the rubber pressure material part and the first insert, so as to improve the connection strength of the rubber pressure material part and the first insert.

[0008] Further, the rubber pressure material part is fixedly arranged on the first insert by pouring, and a wire screw is arranged between the rubber pressure material part and the first insert, so as to improve the connection strength of the rubber pressure material part and the first insert.

[0009] Further, the steel pressure material part comprises a steel pressure material part and a second insert, the steel pressure material part is fixedly arranged on the second insert, and the second insert is connected to the pressure plate base by a second screw; or the second insert is connected to the first insert in the reinforced pressure area by a second screw.

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

[0011] Further, the steel pressure material part is further 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 sequentially inserted into the fourth positioning hole and the third positioning hole, so that the position of the pressure surface of the steel pressure material part fixed to the pressure plate base is accurate.

[0012] Further, a manufacturing and debugging method of a pressure plate combined with rigidity and flexibility is used to manufacture and debug the pressure plate in any one of the above, and the method comprises the following steps:

[0013] Step 1: the working surface of the pressure plate is entirely provided with rubber pressure material parts, the workpiece is subjected to flanging and pressure, the compression amount of the rubber pressure material part is adjusted to X1, the pressure force of the mold is adjusted to F1, and the size and surface of the workpiece meet the requirements;

[0014] Step 2: after the flanging work, the sharp corner upwarping area of the workpiece is determined, the pressure surface corresponding to the sharp corner upwarping area of the workpiece is determined as a reinforced pressure area, and the length L1 and the width L2 of the sharp corner upwarping area of the workpiece are measured;

[0015] Step 3: the rubber pressure material part in the reinforced pressure area is cut off, a notch is formed at the cut-off position of the rubber pressure material part, 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, setting a steel pressure block at the gap;

[0017] Step 5, coating the color oil on the pressure area of the product, debugging and repairing the steel pressure block, adjusting the pressure force of the mold to F1, the compression amount of the rubber pressure block to X1, and performing the flanging work on the product;

[0018] Step 6, observing the state of the color oil pressed by the steel pressure block after the flanging work: when the color change rate of the color oil pressed by the steel pressure block is greater than or equal to 80%, it indicates that the steel pressure block is qualified; otherwise, repeat step 5 to debug and repair the steel pressure block until the steel pressure block is qualified.

[0019] Further, a flanging mold with a rigid and flexible combined pressure plate comprises the pressure plate of any one of the above, the flanging mold comprises an upper mold and a lower mold, the pressure plate is arranged on the upper mold, and each side of the lower mold is provided with at least two precision positioning pins, the pressure plate is provided with a first avoiding hole matched with each precision positioning pin, so as to ensure the stability of the product forming process.

[0020] Further, the precision positioning pin comprises 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 pressure ring of the lower mold.

[0021] Compared with the prior art, the beneficial effects of the present application are that:

[0022] (1) The pressure plate adopts a rigid and flexible pressure structure, the rubber pressure block is arranged in the flexible pressure area, and the steel pressure block is arranged in the reinforced pressure area, so that the pressure force can be increased, the demand of large pressure force for corner flanging is met, the problem of insufficient pressure force of the rubber pressure surface of the reinforced pressure area is solved, the problem of the upwarping of the sharp corner flanging of the product is solved, the debugging and repairing efficiency is improved, and the project debugging cost is saved.

[0023] (2) Each pressure block of the pressure plate adopts a split structure, the pressure surface pressure of each rubber pressure block and steel pressure block can be adjusted locally, the problem of insufficient local pressure of the flexible pressure surface is solved, the operation is simple and convenient, the debugging efficiency is high, and the surface quality of the product can be better improved.

[0024] (3) Each side of the lower mold of the flanging mold is provided with at least two precision positioning pins, so that the flanging mold adopts omnibearing precision positioning, a high-precision "precision positioning system" is established, the product does not produce the movement in the flexible pressure process, the stability of the product forming process is improved, and the accuracy and stability of the product size are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] For a better understanding of the above-mentioned and other objects, features, and advantages of the present application, reference should be made to the following embodiments, which are illustrated in the accompanying drawings. The same reference numerals in different drawings denote the same or similar components. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the application, for which reference should be made only to the appended claims. Various components in the drawings are not drawn to scale for illustrative purposes.

[0026] Figure 1 Schematic diagram of the rigid and flexible combined pressure plate structure of the present application.

[0027] Figure 2 Schematic diagram of the pressure block structure of the rigid and flexible combined pressure plate of the present application.

[0028] Figure 3 Schematic diagram of the rigid and flexible combined pressure block structure of the present application.

[0029] Figure 4 Exploded view of the rigid and flexible combined pressure block of the present application.

[0030] Figure 5 Schematic diagram of the lower die structure of the flanging die of the present application.

[0031] Figure 6 Schematic diagram of the enlarged view of A.

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

[0033] In order to make the objects, technical solutions and advantages of the present application clearer, the following describes exemplary embodiments of the present application with reference to the accompanying drawings, which include various details of the embodiments of the present application to help understanding. It should be considered that they are only exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Also, for the sake of clarity and conciseness, the description below omits the description of well-known functions and structures.

[0034] In the description of the present application, it should be noted that the term "comprising" and its variants means open inclusion, i.e. "including but not limited to". The terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0035] The edge is narrow and thin, the angle between the pressing surface and the horizontal plane is large, the rubber pressing plate material strength at the sharp corner of the corresponding part is weak, the pressing force is insufficient when pressing the corner bevel, and it cannot play an effective pressing role under lateral force, and the corner flanging is prone to upwarping, resulting in unsolvable surface B class defects.

[0036] In order to eliminate the defect of upwarping of the sharp corner flanging, the present application provides a pressing plate combining rigidity and flexibility, as shown in Figure 1 and Figure 2 , which comprises a pressing plate base body 11, a rubber pressing block 12 and a steel pressing block 13, the rubber pressing block 12 and the steel pressing block 13 are detachably arranged on the pressing plate base body 11; the steel pressing block 13 is arranged in the reinforced pressing area corresponding to the part flanging upwarping area. The pressing surface of the pressing plate 1 corresponding to the flanging upwarping area is set as a reinforced pressing area, and the other pressing surfaces are set as flexible pressing areas, the rubber pressing block 12 is arranged in the flexible pressing area, and the steel pressing block 13 is arranged 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, and the steel pressing block 13 can increase the pressing force to meet the demand of large pressing force of the corner flanging, make up for the problem of insufficient pressing force of the rubber pressing surface of the reinforced pressing area, at the same time, the area of the steel pressing surface corresponding to the steel pressing block 13 is small, which is easy to color, debug and repair. The pressing plate 1 uses the pressing structure of rigidity and flexibility, which can solve the problem of upwarping of the sharp corner flanging of the part relative to the rubber pressing plate, eliminate the B class defect of corner upwarping; relative to the steel pressing plate, it can improve the debugging and repairing efficiency and basically eliminate the defects such as material chip indentation.

[0037] In one embodiment, the rubber pressing block 12 comprises a plurality of rubber pressing blocks 12 arranged in the flexible pressing area outside the reinforced pressing area of the pressing plate base body 11. As shown in Figure 2 , each of the rubber pressing blocks 12 comprises a rubber pressing part 121 and a first inlay 122, the rubber pressing part 121 is fixedly arranged on the first inlay 122, and the first inlay 122 is connected to the pressing plate base body 11 by a first screw. In this way, the rubber pressing block 12 and the pressing plate base body 11 are detachably arranged, and each rubber pressing block 12 is arranged in a split type, and each rubber pressing block 12 can be individually detached.

[0038] The rubber pressing part 121 is made of resin material, and the first insert 122 can be made of steel. 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 pouring, and a wire screw is arranged between the rubber pressing part 121 and the first insert 122. Specifically, the wire screw can be arranged on one side of the first insert 122 where the rubber pressing part 121 is arranged, and the rubber pressing part 121 is formed by pouring the resin material on the first insert 122. After pouring, the rubber pressing part 121 is connected to the first insert 122 and the wire screw, and the connection strength between the rubber pressing part 121 and the first insert 122 is high.

[0039] In order to accurately fix the rubber pressing block 12 to the position of the pressing plate base body 11, the rubber pressing block 12 is further provided with a first positioning pin; the pressing plate base body 11 is provided with a first positioning hole, and the first insert 122 is provided with a second positioning hole 1221 matched with the first positioning hole; and the first positioning pin passes through 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 deviating when the rubber pressing block 12 is fixed to the pressing plate base body 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 body 11, and the rubber pressing block 12 can also be prevented from moving and rotating during installation, so that the position of the longer rubber pressing block 12 fixed to the pressing plate base body 11 remains accurate. When the rubber pressing block 12 is wider, the second positioning hole 1221 and the first through hole 1222 are arranged below the first insert 122 of the rubber pressing part 121, and the second avoiding hole 1212 and the third avoiding hole 1213 for avoiding the first positioning pin and the first screw, respectively, can be arranged on the rubber pressing part 121.

[0040] In one embodiment, reference is made to Figure 3 and Figure 4As shown, the steel pressure block 13 comprises a steel pressure part 131 and a second insert 132, and the steel pressure part 131 is fixedly arranged on the second insert 132. Preferably, the steel pressure part 131 and the second insert 132 are integrally arranged, and the pressure force of the steel pressure part 131 can be adjusted by coloring to be uniform with the pressure force of the adjacent rubber pressure part 121, so as to avoid quality defects of the workpiece. When the steel pressure block 13 is large, the second insert 132 can be directly connected to the pressure plate base body 11 through the second screw; when the steel pressure block 13 is narrow and long, the second insert 132 is connected to the first insert 122 in the reinforced pressure area through the second screw, that is, the steel pressure block 13 is arranged on the rubber pressure block 12 with insufficient pressure force, so as to improve the strength of the steel pressure block 13, and the pressure block forms a rigid-flexible pressure block. During installation, the steel pressure block 13 can be first fixed on the rubber pressure block 12, and then the rubber pressure block 12 is fixed on the pressure plate base body 11.

[0041] Each pressure block of the pressure plate 1 adopts a split structure, the pressure surface pressure of each rubber pressure block 12 and steel pressure block 13 can be adjusted separately and locally, and the operation is simple and convenient; and the surface quality of the workpiece can be better improved, and the size springback of the workpiece can be reduced compared with the rubber pressure plate. For example, when the left and right front door outer plates are flanged by the rubber pressure plate, the size springback of the workpiece near the A pillar side is large, and most of the size springback exceeds 2.5 mm; when the left and right front door outer plates are flanged by the rigid-flexible pressure plate 1, the local pressure force is adjusted separately, and after the local pressure plate 1 is strongly compensated, the size springback of the workpiece near the A pillar side is controlled to be within 0.5 mm, which meets the requirements of the whole vehicle matching.

[0042] When the steel pressure block 13 is arranged on the rubber pressure block 12, the second insert 132 is arranged on the first insert 122 in the reinforced pressure area through the second screw, that is, the steel pressure block 13 is arranged on the rubber pressure block 12 with insufficient pressure force, so as to improve the strength of the steel pressure block 13, and the pressure block forms a rigid-flexible pressure block. Figure 3 and Figure 4As shown, long strip-shaped notches 1211 can be arranged on the rubber pressing part 121 corresponding to the sharp corners of the workpiece, and the steel pressing part 131 is arranged in the notches 1211, and the long strip-shaped pressing surface of the steel pressing part 131 is flush with the long strip-shaped pressing surface of the rubber pressing part 121 corresponding to one side of the sharp corner. The first insert 122 is provided with a receiving cavity 1223 for accommodating the second insert 132, and the second insert 132 is fixed in the receiving cavity 1223. The size of the notch 1211 can be determined according to the size of the upwarped area of the sharp corner, and preferably, the length of the notch 1211 is 10-100 mm, and the width is 10-20 mm, that is, the length of the long strip-shaped pressing surface of the steel pressing part 131 is 10-100 mm, and the width is 10-20 mm. For example, the length of the notch 1211 can be 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc., and the width can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0043] In order to accurately fix the position of the steel pressing block 13 on the pressing plate base body 11, the steel pressing block 13 is further provided with a second positioning pin; the pressing plate base body 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 matched with the third positioning hole; and the second positioning pin is sequentially inserted into the fourth positioning hole 1321 and the third positioning hole. The second positioning pin can prevent the position of the steel pressing block 13 from being deviated when the steel pressing block 13 is directly fixed on the pressing plate base body 11 or fixed on the pressing plate base body 11 through the first insert 122, so as to accurately fix the position of the pressing surface of the steel pressing block 13. The length of the steel pressing block 13 is small, and preferably, one second positioning pin and two second screws can be used to connect the steel pressing block 13 with the first insert 122, and correspondingly, the second insert 132 is provided with one fourth positioning hole 1321 and two second through holes 1322 for the second screws to pass through, so as to firmly connect the second insert 132 with the pressing plate base body 11 or the first insert 122, and further prevent the steel pressing block 13 from moving and rotating during installation.

[0044] The application further provides a manufacturing and debugging method of the pressing plate combining rigidity and flexibility, which is used for manufacturing and debugging the pressing plate 1, and comprises the following steps:

[0045] Step 1: The working surface of the pressing plate 1 is entirely provided with the rubber pressing block 12, the rubber pressing block 12 is used for flanging pressing of the workpiece, the compression amount of the rubber pressing block 12 is adjusted to X1, the pressing force of the mold is adjusted to F1, and the size and surface of the workpiece meet the requirements.

[0046] Step 2, after the flanging work, the sharp corner upwarping area of the workpiece is determined, the pressing surface corresponding to the sharp corner upwarping area of the workpiece is determined as the reinforced pressing area, and the length L1 and the width L2 of the sharp corner upwarping area of the workpiece are measured;

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

[0048] Step 4, a steel pressing block 13 is arranged at the gap 1211;

[0049] Step 5, the coloring oil is fully applied on the pressing area of the workpiece, the steel pressing block 13 is debugged and repaired, the pressing force of the mold is adjusted to F1, the compression amount of the rubber pressing block 12 is X1, and the flanging work is performed on the workpiece;

[0050] Step 6, the state of the coloring oil pressed by the steel pressing block 13 after the flanging work of the workpiece is observed: when the discoloration rate of the coloring oil pressed by the steel pressing block 13 is greater than or equal to 80%, it indicates that the steel pressing block 13 is qualified; otherwise, the steel pressing block 13 is debugged and repaired repeatedly until the steel pressing block 13 is qualified.

[0051] When the rigid-flexible pressing plate 1 is manufactured and debugged, the distribution of the reinforced pressing area and the flexible pressing area needs to be confirmed first, that is, the position of the steel pressing block 13 is confirmed. 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, when the size and surface of the workpiece meet the requirements, the compression amount X1 of the rubber and the pressing force F1 of the mold are confirmed. After the flanging work is performed according to the compression amount X1 and the pressing force F1 of the mold, the sharp corner upwarping area of the workpiece is determined through multiple test verifications, the pressing surface corresponding to the sharp corner upwarping area of the workpiece is determined as the reinforced pressing area. Then the length L1 and the width L2 of the sharp corner upwarping area of the workpiece are measured, and the size of the length L1 and the width L2 after being expanded by a certain amount is set as the size of the reinforced pressing area, and the other pressing surfaces are kept as the flexible pressing area. Then the rubber pressing block 12 of the reinforced pressing area is cut off to form a gap 1211, and the steel pressing block 13 is arranged at the gap 1211, that is, the steel pressing block 13 replaces part of the rubber pressing block 12, and the manufacturing of the rigid-flexible pressing plate 1 is completed. Then step 5 and step 6 are performed to debug and repair the steel pressing block 13 until the steel pressing block 13 is qualified. The steel pressing surface area of the steel pressing block 13 is small, and the coloring debugging and repair 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 repair 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 steel pressure surface is sufficient to provide pressure force, avoid the area of the steel pressure surface being too large to increase the difficulty of debugging and rework, and increase the risk of defects caused by foreign matter such as rework scraps, and meet the installation size requirements of the second screw and the second positioning pin. The notch 1211 needs to be set to an appropriate size. Preferably, the length of the notch 1211 is set to 1-10 times the length L1, and the width is set to 1-2 times the width L2. When the sharp corner upwarping area of the workpiece is large, the size of the notch 1211 can be equal to the size of the sharp corner upwarping area; when the sharp corner upwarping area of the workpiece is narrow and long, 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 corner upwarping area, 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 corner upwarping area.

[0053] For example, after the left and right front door outer plate flanging work, the sharp corner upwarping near the door handle is determined as the reinforced pressure area, the length L1 of the sharp corner upwarping area is 10 mm, the width L2 is 9 mm, the length of the notch 1211 is set to 66 mm, and the width is set to 13 mm, that is, the length of the pressure surface of the steel pressure block 13 is 66 mm, and the width is 13 mm. After expanding the size of the sharp corner upwarping area by a certain amount, the strength of the steel pressure part 131 is sufficient and not easy to damage, the pressure force increases during flanging, which can eliminate the problem of sharp corner upwarping near the door handle, make the surface of the workpiece smooth, and the second insert 132 also has sufficient position for installing the second screw and the second positioning pin.

[0054] The present application also provides a flanging die with a pressure plate combining rigidity and flexibility, which comprises the pressure plate 1 of any one of the above, the flanging die comprising an upper die and a lower die 2, the pressure plate 1 being arranged on the upper die, and each side of the lower die 2 being provided with at least two precision positioning pins 23, the pressure plate 1 being provided with a first avoiding hole matched with each precision positioning pin 23 to prevent interference between the pressure plate 1 and each precision positioning pin 23 during pressure. Preferably, each precision positioning pin 23 can be arranged at the four corners and the middle of the lower die 2.

[0055] The pressure plate 1 is provided with the steel pressure block 13, but most of the pressure surface is still a rubber pressure surface, which is easy to slip during the pressure process. In order to ensure that the workpiece does not move during the flexible pressure process, at least two precision positioning pins 23 are arranged on each side of the lower die 2, and the positioning accuracy of each precision positioning pin 23 is not more than 0.2 mm. Compared with the traditional die which realizes precision positioning through 1-2 points, the flanging die adopts omnibearing precision positioning, establishes a high-precision "precision positioning system", and can ensure the stability of the workpiece forming process, thereby ensuring the precision and stability of the workpiece size and 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. The hole positioning pin 231 is arranged on the punch 21 of the lower die 2, and the L-shaped positioning pin 232 is arranged on the pressure ring 22 of the lower die 2. During the flanging work, the hole positioning pin 231 penetrates 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 pressure process and offset the lateral force, so that the workpiece forming process is stable. For example, when two precision positioning points are used for the left front door outer plate of a vehicle, the size fluctuation of the profile of the workpiece after flanging is about 0.81 mm, which exceeds the tolerance value of the workpiece by 0.5 mm. After using the precision positioning system, the maximum size fluctuation of the profile of the front door outer plate of the vehicle after flanging is about 0.3 mm, and the profile fluctuation size is within the tolerance value of 0.5 mm, which ensures the size precision and stability of the workpiece.

[0057] The pressure plate 1 adopts a rigid-flexible pressure structure, and the rubber pressure block 12 is arranged in the flexible pressure area and the steel pressure block 13 is arranged in the reinforced pressure area, which can increase the pressure force, meet the demand of large pressure force for corner flanging, make up for the problem of insufficient pressure force of the rubber pressure surface in the reinforced pressure area, solve the problem of upwarping of the sharp corner of the workpiece, improve the debugging and repair efficiency, and save the project debugging cost. The pressure plate 1 adopts a split structure, and the pressure surface pressure of each rubber pressure block 12 and steel pressure block 13 can be adjusted locally and individually, which solves the problem of insufficient local pressure of the flexible pressure surface, is simple and convenient to operate, has high debugging efficiency, and can better improve the surface quality of the workpiece. The pressure plate 1 has a wide application range and can be applied to the left and right front door outer plate flanging die. Simple modification can be made on the existing rubber pressure plate, and the pressure plate 1 can also be popularized and applied in other mechanical manufacturing or industrial production fields related to rubber pressure structures.

[0058] The above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure plate combining rigidity and flexibility, characterized in that, It includes a pressure plate base, a rubber pressure block, and a steel pressure block, wherein the rubber pressure block and the steel pressure block are detachably disposed on the pressure plate base; the steel pressure block is disposed in the reinforced pressure area corresponding to the upturned area of ​​the flange of the workpiece.

2. The pressure plate combining rigidity and flexibility according to claim 1, characterized in that, The rubber pressing blocks include multiple flexible pressing areas disposed outside the reinforced pressing area of ​​the pressing plate substrate; each rubber pressing block includes a rubber pressing part and a first insert, the rubber pressing part is fixedly disposed on the first insert, and the first insert is connected to the pressing plate substrate by a first screw.

3. The pressure plate combining rigidity and flexibility according to claim 2, characterized in that, The rubber pressing part is fixedly installed on the first insert by casting, and a threaded screw is provided between the rubber pressing part and the first insert.

4. The pressure plate combining rigidity and flexibility 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 that matches the first positioning hole; the first positioning pin is inserted into the second positioning hole and the first positioning hole in sequence.

5. The pressure plate combining rigidity and flexibility according to claim 2, characterized in that, The steel pressure block includes a rigid pressure part and a second insert. The rigid pressure part is fixedly disposed on the second insert, and the second insert is connected to the pressure plate base by a second screw; or the second insert is connected to a first insert located in the reinforced pressure area by a second screw.

6. The pressure plate combining rigidity and flexibility according to claim 5, characterized in that, The rubber pressing part corresponding to the sharp corner of the part is provided with an elongated notch, and the rigid pressing part is provided in the notch. The elongated pressing surface of the rigid pressing part is flush with the elongated pressing surface of the rubber pressing part on one side of the sharp corner of the part.

7. The pressure plate combining rigidity and flexibility according to claim 6, characterized in that, The length of the notch is 10-100mm and the width is 10-20mm.

8. The pressure plate combining rigidity and flexibility according to claim 5, characterized in that, 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 that matches the third positioning hole; the second positioning pin passes through the fourth positioning hole and the third positioning hole in sequence.

9. A method for manufacturing and adjusting a pressure plate combining rigidity and flexibility, used for manufacturing and adjusting the pressure plate according to any one of claims 1-8, characterized in that, The method includes the following steps: Step 1: Use rubber pressure blocks to press and fold the workpiece on the entire working surface of the pressure plate. Adjust the compression amount of the rubber pressure blocks to X1 and the pressing force of the mold to F1 to ensure that the size and surface of the workpiece meet the requirements. Step 2: After the flanging work, determine the area where the sharp corner of the part is raised, and determine the pressure surface corresponding to the area where the sharp corner of the part is raised as the reinforced pressure area. Measure the length L1 and width L2 of the area where the sharp corner of the part is raised. Step 3: Cut off the rubber pressing block in the reinforcing pressing area to form a notch. The length of the notch is set to 1-10 times L1 and the width is set to 1-2 times L2. Step 4: Install steel pressure blocks at the notch; Step 5: Apply coloring oil to the pressing area of ​​the part, adjust 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 the flanging work on the part. Step 6: Observe the state of the coloring oil in the area pressed by the steel pressure block after the part has undergone the flanging process: when the color change rate of the coloring oil in the area pressed by the steel pressure block is greater than or equal to 80%, it indicates that the steel pressure block has been properly repaired; otherwise, repeat step 5 to adjust and repair the steel pressure block until it is properly repaired.

10. A flanging die with a pressure plate combining rigidity and flexibility, comprising the pressure plate as described in any one of claims 1-8, characterized in that, The flanging die includes an upper die and a lower die. The pressure plate is disposed on the upper die. Each side of the lower die is provided with at least two precision positioning pins. The pressure plate is provided with a first clearance hole that matches each precision positioning pin.

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

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