Stamping and drawing material pressing surface flanging die and method

Abstract

The invention relates to a stamping and drawing material pressing face flanging die and method, and the stamping and drawing material pressing face flanging die comprises a first die which comprises a drawing male die and a male die blank holder, the male die blank holder is arranged on the periphery of the drawing male die, and a corner bending insert penetrating through the male die blank holder is arranged on the outer side of the drawing male die; and the second die comprises a drawing female die, the drawing female die and the drawing male die are opposite up and down, and an upper die rigid block which is matched with the corner bending insert to upwards fold the four corners of the plate blank together is arranged on the second die. According to the stamping and drawing material pressing face edge folding die, before a plate blank is placed between the first die and the second die to be subjected to drawing forming, the corner bending inserts and the upper die rigid blocks are matched for upwards folding the four corners of the plate blank. The four corners of the plate blank are folded before drawing forming, the drawing feeding stability of the four corners of the plate blank is improved, the final size of a drawn part is reduced, the investment cost of a follow-up die is reduced, and the positioning stability of the follow-up die is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of stamping manufacturing of body sheet metal, and in particular to a stamping, drawing, pressing, and folding die and method. Background Art

[0002] With the rapid development of automobile manufacturing technology, the issue of automobile cost reduction has become more and more prominent. As a fixed investment in the whole vehicle, the cost of stamping tooling accounts for a large proportion, and a more reasonable stamping design process must be adopted to reduce the investment cost. According to the traditional stamping and drawing die edge design requirements, the shape is simple and the plate surface is smooth, generally an XY direction plane or a smooth surface extended from the drawn part.

[0003] In order to save a set of blanking dies, most manufacturers use the swing shear process for stamping sheets without affecting the material utilization rate. This type of sheet corner area is not only useless, but also has a great impact on the size of the subsequent die and the design of the sliding space, thereby increasing the investment cost of the subsequent die. The corner area of ​​the drawn part is wrinkled due to the violent unidirectional flow of the sheet. Many design schemes will add wrinkle suction ribs or process shapes at the corners, which increases the difficulty of die debugging and thus increases the cost of die manufacturing.

[0004] The subsequent processing dies of the drawing die, especially the first trimming die, are basically positioned by the profile formed by drawing to position the drawn workpiece, but this positioning has problems: the profile positioning of some shallow drawn parts is unstable; the final drawn part sheet line is not absolutely stable. Therefore, the process production stability is poor. Summary of the invention

[0005] The embodiment of the present application provides a stamping and drawing press surface folding die and method to solve the problem in the related art that the corner area of ​​the plate blank has a great influence on the size of the subsequent die and the sliding space design, thereby increasing the investment cost of the subsequent die.

[0006] A first aspect of the embodiment of the present application provides a stamping, drawing, pressing and folding die, comprising:

[0007] A first die, wherein the first die comprises a drawing punch and a punch pressure ring, wherein the punch pressure ring is arranged around the drawing punch, and a corner bending insert passing through the punch pressure ring is arranged on the outer side of the drawing punch;

[0008] The second mold comprises a drawing die, the drawing die is opposite to the drawing punch up and down, and the second mold is provided with an upper mold rigid block adapted to cooperate with the corner bending insert to fold the four corners of the sheet blank upwards.

[0009] In some embodiments: the first mold further comprises a lower mold base, the drawing punch is fixedly connected to the top of the lower mold base, and the corner bending insert is slidably connected to the top of the lower mold base;

[0010] When the first die and the second die approach each other, the upper die rigid block drives the corner bending insert to slide in a direction approaching the drawing punch.

[0011] In some embodiments: a support seat is fixedly connected to the lower die seat, the corner bending insert is slidably connected to the top of the support seat, the support seat is located inside the punch edge pressing ring, the top of the corner bending insert extends out of the punch edge pressing ring, a slide groove is provided on the top of the support seat, and a slider slidably connected to the slide groove is provided at the bottom of the corner bending insert.

[0012] In some embodiments: the cross-section of the corner bending insert is an isosceles right triangle structure, the top of the corner bending insert is provided with a guide slope, the guide slope is located on two right-angled sides of the corner bending insert, and the upper mold rigid block is slidably connected to the guide slope.

[0013] In some embodiments: a circular arc concave surface facing the drawing punch is provided on the top bevel of the corner bending insert, and an arc convex surface matching the circular arc concave surface of the corner bending insert is provided on the edge of the pressing surface of the drawing die.

[0014] In some embodiments: the corner bending inserts are provided in four groups, and the four groups of the corner bending inserts are divided into four corners arranged on the outside of the drawing punch; the upper die rigid blocks are provided in four groups, and the four groups of the upper die rigid blocks are divided into four corners arranged on the bottom of the drawing die.

[0015] In some embodiments: through holes for penetrating the corner bending inserts are provided at the four corners of the punch edge pressing ring, and the through holes are located on the outside of the drawing ribs on the punch edge pressing ring.

[0016] In some embodiments: it also includes a trimming and punching die, the trimming and punching die includes a trimming punch, and the four top corners of the trimming punch are provided with upwardly protruding positioning ribs.

[0017] A second aspect of the embodiments of the present application provides a stamping and drawing blank face folding method, the method using the stamping and drawing blank face folding die described in any of the above embodiments, the method comprising:

[0018] The cut sheet blank is placed on the punch edge ring of the first die, and the press machine drives the second die downward, so that the pressing surface of the drawing die contacts the sheet blank;

[0019] The press continues to drive the second die downward, and the drawing die and the punch edge clamping ring clamp the sheet material downward, and the four corners of the sheet material begin to contact the corner bending insert;

[0020] The press continues to drive the second die downward, and the upper die rigid block and the corner bending insert cooperate to fold the four corners of the sheet blank upward;

[0021] The press continues to drive the second die downward to a specified stroke, and the drawing punch and the drawing die draw the sheet metal blank into a drawing blank with four corners folded upward.

[0022] In some embodiments: the method further comprises:

[0023] The press drives the second die upward to remove the drawn blank from the punch edge ring;

[0024] Place the drawn blank on the trimming punch of the trimming punching die, and use the positioning ribs at the top four corners of the trimming punch to position the drawn blank on the trimming punch.

[0025] The beneficial effects of the technical solution provided by this application include:

[0026] The embodiment of the present application provides a stamping and drawing blank surface folding die and method. The stamping and drawing blank surface folding die of the present application is provided with a first die, which includes a drawing punch and a punch pressure ring. The punch pressure ring is arranged around the drawing punch, and the outer side of the drawing punch is provided with a corner bending insert passing through the punch pressure ring; the second die includes a drawing die, the drawing die and the drawing punch are opposite to each other up and down, and the second die is provided with an upper die rigid block which is adapted to the corner bending insert to fold the four corners of the sheet blank upward.

[0027] Therefore, the stamping and drawing pressing face folding die of the present application, when the sheet blank is placed between the first die and the second die for drawing and forming, the four corners of the sheet blank are folded upwards by using the corner bending insert and the upper die rigid block to cooperate with each other. The four corners of the sheet blank are folded before drawing and forming, which increases the stability of the four corners of the sheet blank during drawing and feeding, reduces the final size of the drawn part, reduces the investment cost of the subsequent die, and achieves the positioning stability of the subsequent die. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 An exploded diagram of the first mold and the second mold of an embodiment of the present application;

[0030] Figure 2A cross-sectional view of the first mold and the second mold of an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of a trimming punch of a trimming punching die according to an embodiment of the present application;

[0032] Figure 4 This is a process flow chart of the stamping, drawing, and folding method of the blank surface according to an embodiment of the present application.

[0033] Reference numerals:

[0034] 1. Lower die seat; 2. Punch pressure ring; 3. Corner bending insert; 4. Drawing die; 5. Trimming punch; 6. Positioning rib; 7. Drawing punch. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The embodiment of the present application provides a stamping and drawing pressing surface folding die and method, which can solve the problem in the related art that the corner area of ​​the plate blank has a great influence on the size of the subsequent die and the sliding space design, thereby increasing the investment cost of the subsequent die.

[0037] See also Figure 1 and Figure 2 As shown, the first aspect of the embodiment of the present application provides a stamping, drawing, pressing, and folding die, comprising:

[0038] The first die comprises a drawing punch 7 and a punch pressure ring 2. The punch pressure ring 2 is arranged around the drawing punch 7. A corner bending insert 3 passing through the punch pressure ring 2 is arranged on the outer side of the drawing punch 7. The punch pressure ring 2 is on the outer periphery of the drawing punch 7 and moves relative to the drawing punch 7. When the punch pressure ring 2 moves downward relative to the drawing punch 7, the corner bending insert 3 extends from the inside of the punch pressure ring 2 to the top of the punch pressure ring 2.

[0039] The second die includes a drawing die 4, which is opposite to the drawing punch 7, and is provided with an upper die rigid block (not shown) adapted to cooperate with the corner bending insert 3 to fold the four corners of the sheet blank upward. When the second die moves toward the direction approaching the first die under the driving action of the press, the corner bending insert 3 and the upper die rigid block cooperate with each other to form upwardly folded flanges at the four corners of the sheet blank.

[0040] The stamping and drawing pressing face folding die of the embodiment of the present application, when the sheet blank is placed between the first die and the second die for drawing and forming, the four corners of the sheet blank are folded upwards by using the corner bending insert 3 and the upper die rigid block to cooperate with each other. The four corners of the sheet blank are folded before drawing and forming, which increases the stability of the four corners of the sheet blank during drawing and feeding, reduces the difficulty of drawing and debugging, reduces the final external dimensions of the drawn part, reduces the investment cost of the subsequent die, and achieves the positioning stability of the subsequent die.

[0041] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a stamping and drawing blank face folding die, wherein the first die of the stamping and drawing blank face folding die also includes a lower die base 1, a drawing punch 7 is fixedly connected to the top of the lower die base 1, and a corner bending insert 3 is slidably connected to the top of the lower die base 1. When the first die and the second die approach each other, the upper die rigid block drives the corner bending insert 3 to slide in the direction close to the drawing punch 7.

[0042] The corner bending insert 3 of the embodiment of the present application is slidably connected to the top of the lower die seat 1. When the first die and the second die are close to each other, the upper die rigid block drives the corner bending insert 3 to slide in the direction close to the drawing punch 7, so that the corner bending insert 3 moves upward relative to the punch pressure ring 2, and slides relative to the punch pressure ring 2 in the direction close to the drawing punch 7. Then, the four corners of the sheet blank are folded upward to form a triangular flange.

[0043] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a stamping and drawing blank face folding die, wherein a support seat is fixedly connected to the lower die seat 1 of the stamping and drawing blank face folding die, and a corner bending insert 3 is slidably connected to the top of the support seat. The support seat is located inside the punch press ring 2, and the top of the corner bending insert 3 extends out of the punch press ring 2. A slide groove (not shown in the figure) is provided on the top of the support seat, and a slider (not shown in the figure) slidably connected to the slide groove is provided on the bottom of the corner bending insert.

[0044] In the embodiment of the present application, a support seat is fixedly connected to the lower die seat 1, and a corner bending insert 3 is slidably connected to the top of the support seat. The corner bending insert 3 and the support seat are slidably connected to each other through a slide groove and a slider, so that the corner bending insert 3 can slide and fold the four corners of the sheet blank sideways to prevent the surface of the sheet blank from being damaged during vertical folding. The corner bending insert 3 and the support seat are slidably connected to each other through a slide groove and a slider, and different models of corner bending inserts 3 can be easily replaced to fold out flanges of different specifications.

[0045] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a stamping and drawing blank surface folding die, the cross-section of the corner bending insert 3 of the stamping and drawing blank surface folding die is an isosceles right triangle structure, and a guide slope is provided on the top of the corner bending insert 3, and the guide slope is located on the two right-angled sides of the corner bending insert 3, and the upper die rigid block is slidably connected to the guide slope.

[0046] The cross section of the corner bending insert 3 of the embodiment of the present application is an isosceles right triangle structure, one side of the hypotenuse of the corner bending insert 3 faces the drawing punch 7, and the two right-angled sides of the corner bending insert 3 are respectively parallel to the side walls of the lower die seat 1. A guide slope is provided on the top of the corner bending insert 3, and the guide slope is located on the two right-angled sides of the corner bending insert 3. When the upper die rigid block moves downward toward the direction close to the corner bending insert 3, the upper die rigid block drives the corner bending insert 3 to slide toward the direction close to the drawing punch 7 to fold the four corners of the sheet blank.

[0047] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a stamping and drawing blank surface folding die, wherein the top oblique edge of the corner bending insert 3 of the stamping and drawing blank surface folding die is provided with an arc concave surface facing the drawing punch 7 (not shown in the figure), and the edge of the blank surface of the drawing die 4 is provided with an arc convex surface (not shown in the figure) that matches the arc concave surface of the corner bending insert 3.

[0048] In the embodiment of the present application, the top bevel of the corner bending insert 3 is provided with an arc concave shape and size facing the drawing punch 7, and the edge of the pressing surface of the drawing die 4 is provided with an arc convex shape and size that matches the arc concave surface of the corner bending insert 3, so that the four corners of the sheet blank can be folded into the set width, folding angle, bending height and bending radius.

[0049] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides a stamping and drawing blank face folding die, and the stamping and drawing blank face folding die has four groups of corner bending inserts 3, which are divided into four corners arranged outside the drawing punch 7, and four groups of upper die rigid blocks, which are divided into four corners arranged at the bottom of the drawing die 4. Through holes for penetrating the corner bending inserts 3 are provided at the four corners of the punch pressure ring 2, and the through holes are located outside the drawing ribs on the punch pressure ring 2.

[0050] The embodiment of the present application is provided with four groups of corner bending inserts 3 and upper die rigid blocks, each group of corner bending inserts 3 and upper die rigid blocks cooperate with each other, when the first die and the second die are close to each other, the upper die rigid block drives the corner bending inserts 3 to slide in the direction close to the drawing punch 7, so that the corner bending inserts 3 move upward relative to the punch pressure ring 2, and slide relative to the punch pressure ring 2 in the direction close to the drawing punch 7. Then the four corners of the sheet blank are synchronously folded upward to form a triangular flange.

[0051] In some alternative embodiments: See Figure 3 As shown, the embodiment of the present application provides a stamping and drawing blank face folding die, which also includes a trimming and punching die, and the trimming and punching die includes a trimming punch 5, and upwardly protruding positioning ribs 6 are provided at the top four corners of the trimming punch 5. The trimming and punching die is used to trim and punch the drawn blank taken out from the first die and the second die.

[0052] In the embodiment of the present application, upwardly protruding positioning ribs 6 are provided at the four corners of the top of the trimming punch 5, and the positioning ribs 6 are used to initially position the drawn blank taken out from the first mold and the second mold at the top of the trimming punch 5. Four positioning ribs 6 are provided, and the four positioning ribs 6 are respectively positioned with the flanges at the four corners of the drawn blank, and the upward folding of the four corners of the drawn blank also reduces the space occupied by the trimming punch 5, the size of the trimming punch 5 can be reduced, and the mold opening cost of the trimming punch 5 is reduced.

[0053] See also Figures 1 to 4 As shown, the second aspect of the embodiment of the present application provides a stamping and drawing press blank surface folding method, the method uses the stamping and drawing press blank surface folding die described in any of the above embodiments, and the method includes:

[0054] Step 1: Place the cut sheet blank on the punch edge pressing ring 2 of the first die, and a press machine (not shown) drives the second die downward, so that the pressing surface of the drawing die 4 contacts the sheet blank.

[0055] Step 2, the press continues to drive the second die downward, the drawing die 4 and the punch edge ring 2 clamp the sheet metal blank downward, the corner bending insert 3 extends out of the punch edge ring 2, and the four corners of the sheet metal blank begin to contact the corner bending insert 3.

[0056] Step 3: The press continues to drive the second die downward, and the upper die rigid block and the corner bending insert 3 cooperate to fold the four corners of the sheet blank upward, forming upwardly folded flanges at the four corners of the sheet blank.

[0057] Step 4: The press continues to drive the second die downward to a specified stroke, and the drawing punch 7 and the drawing die 4 squeeze each other to draw the sheet blank into a drawing blank with four corners folded upward.

[0058] Step 5: The press drives the second die upward, removes the drawn blank from the punch edge ring 2, places the drawn blank on the trimming punch 5 of the trimming punching die, and uses the positioning ribs 6 at the top four corners of the trimming punch 5 to position the drawn blank on the trimming punch 5.

[0059] How it works

[0060] The embodiment of the present application provides a stamping and drawing blank surface folding die and method. Since the stamping and drawing blank surface folding die of the present application is provided with a first die, the first die includes a drawing punch 7 and a punch pressure ring 2, the punch pressure ring 2 is arranged around the drawing punch 7, and the outer side of the drawing punch 7 is provided with a corner bending insert 3 passing through the punch pressure ring 2; the second die, the second die includes a drawing die 4, the drawing die 4 is opposite to the drawing punch 7 up and down, and the second die is provided with an upper die rigid block adapted to cooperate with the corner bending insert 3 to fold the four corners of the sheet blank upward.

[0061] Therefore, the stamping and drawing pressing face folding die of the present application, when the sheet blank is placed between the first die and the second die for drawing and forming, the four corners of the sheet blank are folded upwards by using the corner bending insert 3 and the upper die rigid block to cooperate with each other. The four corners of the sheet blank are folded before drawing and forming, which increases the stability of the four corners of the sheet blank during drawing and feeding, reduces the final size of the drawn part, reduces the investment cost of the subsequent die, and achieves the positioning stability of the subsequent die.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0063] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A stamping and drawing press blank surface folding die, characterized in that: include: A first die, the first die comprising a drawing punch (7) and a punch pressure ring (2), the punch pressure ring (2) being arranged around the drawing punch (7), and a corner bending insert (3) passing through the punch pressure ring (2) being arranged on the outer side of the drawing punch (7); The second die comprises a drawing die (4), the drawing die (4) and the drawing punch (7) are vertically opposed to each other, and the second die is provided with an upper die rigid block adapted to cooperate with the corner bending insert (3) to fold the four corners of the sheet material upwards.

2. A stamping, drawing, pressing and folding die according to claim 1, characterized in that: The first mold further comprises a lower mold base (1), the drawing punch (7) is fixedly connected to the top of the lower mold base (1), and the corner bending insert (3) is slidably connected to the top of the lower mold base (1); When the first die and the second die approach each other, the upper die rigid block drives the corner bending insert (3) to slide in a direction approaching the drawing punch (7).

3. A stamping, drawing, pressing and folding die as claimed in claim 2, characterized in that: A support seat is fixedly connected to the lower die seat (1), and the corner bending insert (3) is slidably connected to the top of the support seat. The support seat is located inside the punch edge pressing ring (2), and the top of the corner bending insert (3) extends out of the punch edge pressing ring (2). A sliding groove is provided on the top of the support seat, and a sliding block slidably connected to the sliding groove is provided at the bottom of the corner bending insert (3).

4. A stamping, drawing, pressing and folding die as claimed in claim 1 or 2, characterized in that: The cross section of the corner bending insert (3) is an isosceles right triangle structure. A guide slope is provided on the top of the corner bending insert. The guide slope is located on two right-angled sides of the corner bending insert (3). The upper mold rigid block is slidably connected to the guide slope.

5. A stamping, drawing, pressing and folding die as claimed in claim 4, characterized in that: The top bevel of the corner bending insert (3) is provided with an arc concave surface facing the drawing punch (7), and the edge of the pressing surface of the drawing die (4) is provided with an arc convex surface matching the arc concave surface of the corner bending insert (3).

6. A stamping, drawing, pressing and folding die according to claim 1, characterized in that: The corner bending inserts (3) are provided in four groups, and the four groups of corner bending inserts (3) are arranged at four corners outside the drawing punch (7); the upper die rigid blocks are provided in four groups, and the four groups of upper die rigid blocks are arranged at the four bottom corners of the drawing die (4).

7. A stamping, drawing, pressing and folding die as claimed in claim 6, characterized in that: Through holes for penetrating the corner bending inserts (3) are provided at the four corners of the punch edge pressing ring (2), and the through holes are located outside the draw ribs on the punch edge pressing ring (2).

8. A stamping, drawing, pressing and folding die as claimed in claim 1, characterized in that: It also comprises a trimming and punching die, wherein the trimming and punching die comprises a trimming punch (5), and the four corners of the top of the trimming punch (5) are provided with positioning ribs (6) protruding upwards.

9. A method for folding the edge of a punching and drawing blank, characterized in that: The method uses the stamping, drawing, pressing and folding die according to any one of claims 1 to 8, and the method comprises: The cut sheet blank is placed on the punch edge pressing ring (2) of the first die, and the press machine drives the second die downward, so that the pressing surface of the drawing die (4) contacts the sheet blank; The press continues to drive the second die downward, and the drawing die (4) and the punch edge clamp (2) clamp the sheet material downward, and the four corners of the sheet material begin to contact the corner bending insert (3); The press continues to drive the second die downward, and the upper die rigid block and the corner bending insert (3) cooperate to fold the four corners of the sheet blank upward. The press continues to drive the second die downward to a specified stroke, and the drawing punch (7) and the drawing die (4) draw the sheet metal blank into a drawn blank with four corners folded upward.

10. A stamping and drawing press blank surface folding method as claimed in claim 9, characterized in that: The method further comprises: The press machine drives the second die upward to remove the drawn blank from the punch edge holder (2); The drawn blank is placed on the trimming punch (5) of the trimming punching die, and the drawn blank is positioned on the trimming punch (5) using the positioning ribs (6) at the four corners of the top of the trimming punch (5).

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