CN105642751A - An automobile B-pillar inner panel drawing die - Google Patents

Abstract

The present invention discloses a drawing die for the inner plate of the B-pillar of an automobile, comprising an upper die, a pressure ring, a lower die plate and two punches. The working surface of the upper die is provided with a die cavity matched with the two punches, a piercing knife is provided at a position corresponding to the waste area of the sheet material between the two punches, and an upper receiving groove for receiving the piercing knife is provided on the inner wall of the die cavity. The drawing die for the inner plate of the B-pillar of an automobile of the present invention is provided with two punches on the lower die plate and a die cavity is provided in the upper die accordingly, so that two inner plates of the B-pillar can be formed by drawing at one time, and the production efficiency is high; in addition, a piercing knife is provided between the two punches, and a hole is cut in the waste area of the sheet material during the drawing process by the piercing knife, so as to facilitate the internal flow of the material, so that the sheet material can be fully drawn without cracking, so that the work that originally requires two processes to complete can be completed in the drawing sequence, thereby saving the mold manufacturing cost and the stamping cost.

Description

An automobile B-pillar inner panel drawing die

technical field

The invention belongs to the technical field of moulds, and in particular, the invention relates to a drawing die for an inner panel of an automobile B-pillar.

Background technique

With the rapid development of the car industry, especially the urgent need for the expansion of the domestic small car market, major OEMs require to improve the production efficiency of their products.

At present, the inner panel of the B-pillar on the automobile needs to be drawn and formed on the drawing die. Since the current drawing die can only form one B-pillar inner panel at a time, the production efficiency is low, and the production capacity cannot meet the requirements. If the production capacity is to be increased, it is necessary to increase hardware investment, and the hardware cost occupies a large part of the product production cost. Ratio, it will result in an increase in product manufacturing costs.

Due to the complex shape of the inner panel of the B-pillar of the automobile, it is difficult to form it. Due to the relatively deep molding depth and the difficulty of material flow during drawing, the sheet metal is cracked in the finished area of the sheet metal. The conventional method is to reduce the forming depth in the drawing process, so as to reduce the flow of the material in the drawing sequence, and then shape the final product through the subsequent mold; but the increase in the process content will undoubtedly increase the cost of mold manufacturing and later maintenance .

Contents of the invention

The invention provides a drawing die for the inner panel of a B-pillar of an automobile. The purpose is to improve the production efficiency of the inner panel of the B-pillar, facilitate the internal flow of materials during drawing, and ensure that the drawing of the sheet is sufficient without cracking.

In order to achieve the above object, the technical solution adopted by the present invention is: a drawing die for the inner panel of the B-pillar of an automobile, including an upper mold, a blank holder, a lower template and a convex mold that is arranged on the lower template and has the same shape as the inner panel of the B-pillar of the automobile. There are two punches, and the working surface of the upper die is provided with a cavity that matches the two punches, and a piercing knife is provided between the two punches corresponding to the waste area of the sheet metal. The inner wall of the cavity is provided with an upper accommodating groove for accommodating the puncture knife.

The two punches are arranged on the lower template along the width direction of the lower template, and are symmetrical.

The two punches are connected to form an integral structure, and the piercing knife is arranged in the connection area between the two punches.

There are two piercing knives in total, and the two piercing knives are arranged in a straight line along the length direction of the drawing die.

The connection area is provided with a lower receiving groove for receiving the lancing knife.

The piercing knife is a pointed piercing knife.

The two ends of the blank holder are provided with guide blocks, and the two ends of the upper die are provided with a first chute for inserting the guide blocks.

The other two ends of the upper die have second sliding slots for inserting the two opposite frames of the blank holder.

A locator for locating the sheet is vertically provided on the blank holder.

The blank holder is slidably connected with the lower formwork through safety bolts.

The drawing die for the inner panel of the B-pillar of the automobile of the present invention can form two inner panels of the B-pillar by one-time drawing by setting two convex dies on the lower template and correspondingly setting the cavity in the upper mold, and the production efficiency is high ;In addition, a puncture knife is set between the two punches, and a hole is cut in the waste area of the sheet metal during the drawing process by the puncture knife to facilitate the internal flow of the material, so that the sheet material can be fully drawn without cracking, thus The work that originally required two processes can be completed in the drawing process, thus saving mold manufacturing costs and stamping costs.

Description of drawings

This manual includes the following drawings, the contents shown are:

Fig. 1 is a structural schematic diagram of the drawing die of the inner panel of the B-pillar of the automobile;

Fig. 2 is the structural representation of patrix;

Fig. 3 is the front view of patrix;

Fig. 4 is the mold structure schematic diagram after removing patrix;

Fig. 5 is the top view of Fig. 4 structure;

Fig. 6 is a top view of the structure in Fig. 4 after removing the blank holder and the piercing knife;

Fig. 7 is a structural schematic diagram of a blank holder;

Figure 8 is a top view of the blank holder;

Fig. 9 is a schematic diagram of the structure at the drawbead;

Fig. 10 is a schematic structural view of the piercing knife;

Fig. 11 is the sectional view of piercing knife and patrix;

Figure 12 is a schematic structural view of the locator;

Labeled in the figure:

1. Locator; 2. Safety bolt; 3. Upper mold; 31. Die cavity; 32. Drawbead; 33. Avoidance hole; 34. First chute; 35. Second chute; 36. Upper accommodation Groove; 37, sliding column; 4, blank holder ring; 41, frame; 42, groove; 43, guide block; 44, first guide plate; 45, second guide plate; 5, lower template; 6, punch; 61 , the connection area; 62, the lower holding tank; 7, the piercing knife.

detailed description

The specific embodiment of the present invention will be described in further detail by describing the embodiments below with reference to the accompanying drawings, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.

As shown in Figures 1 to 12, a drawing die for the inner panel of an automobile B-pillar according to the present invention includes an upper mold 3, a blank holder 4, a lower template 5, and is arranged on the lower template 5 and has the same shape as the inner panel of an automobile B-pillar. The punch 6 is provided with two punches 6, and the working surface of the upper die 3 is provided with a die cavity 31 that matches the two punches 6, and the punch 6 and the die cavity 31 cooperate to pull the sheet. Extended forming, forming two B-pillar inner panels at one time, the shape of the molding surface of the punch 6 and the die cavity 31 is the same as that of the automobile B-pillar inner panel. In this B-pillar inner panel drawing die, two punches 6 are set on the lower template 5, and the die cavity 31 can accommodate two punches 6. There are two molding surfaces in the die cavity 31, corresponding to one punch 6 respectively. , so that two identical automotive B-pillar inner panels can be formed at one time, which significantly improves production efficiency. As shown in Figure 1, the blank holder 4 is located between the upper mold 3 and the lower template 5, and the two punches 6 are embedded in the through holes provided in the blank holder 4, and protrude upward from the through holes to insert the upper mold 3 in the die cavity 31.

Specifically, the inner panel of the B-pillar of the automobile is elongated, and the width from one end to the other end along the length direction is gradually reduced, and the shape of the forming surface in the corresponding punch 6 and the cavity 31 of the concave mold is the same as that in the B-pillar of the automobile. The shape of the plate is matched, and the width along the length direction is gradually reduced from one end to the other end, as shown in Fig. 3 and Fig. 6 . In this B-pillar inner panel drawing die, the shapes of the upper die 3 and the lower die 5 are also rectangular, and the punch 6 and the die cavity 31 are arranged in the middle of the lower die 5 and the upper die 3 in the length direction respectively. As shown in Figure 6, two convex molds 6 are arranged on the top surface of the lower template 5 along the width direction of the lower template 5, and are arranged symmetrically with the middle line passing through the midpoint of the width direction of the lower template 5 as a line of symmetry, and the two The large end portions of the two punches 6 are located on the same side. The two punches 6 are arranged symmetrically along the width direction on the lower template 5, so that the overall structure of the mold can be made compact and the space occupied is small. Correspondingly, the molding surfaces in the cavity 31 of the upper mold 3 are also arranged in the same manner as the two male molds 6 , as shown in FIG. 3 .

Preferably, the two punches 6 are connected into an integrated structure to form an integral protrusion on the lower formwork 5 , and there is a connection area 61 between the two punches 6 , which corresponds to the sheet waste area. Moreover, the convex mold 6 and the lower template 5 can also be integrally cast, which is not only convenient for processing and manufacturing, but also has high strength.

As shown in Fig. 5 and Fig. 11, a piercing knife 7 is provided in the connection area 61 between the two punches 6, and the inner top wall of the corresponding die cavity 31 is provided with a piercing knife at a position corresponding to the sheet waste area. 7 on the receiving groove 36. A piercing knife 7 is set between the two punches 6, and a hole is cut in the waste area of the sheet metal during the drawing process by the piercing knife 7, so as to facilitate the internal flow of the material, so that the sheet material can be fully drawn without cracking, thereby The work that originally required two processes can be completed in the drawing process, so the cost of mold manufacturing and stamping can be saved.

As preferably, there are two puncture knives 7, and the two puncture knives 7 are arranged in a straight line along the length direction of the drawing die, and the top surface of the connection area 61 is provided with a seat for accommodating the two puncture knives 7. A lower receiving groove 62. The lower holding groove 62 is a linear groove, its length is equal to the total length of the two piercing knives 7, its width is equal to the width of the two piercing knives 7, and the width of the upper holding groove 36 is slightly greater than the width of the two piercing knives 7 . The lower accommodating groove 62 extends from the wide ends of the two punches 6 to approximately the middle of the punches 6 to ensure that the piercing knife 7 cuts a large opening in the sheet waste area during the drawing process.

As preferably, as shown in Figure 10, two piercing knives 7 are pointed piercing knives, and its tip protrudes upwards and protrudes from the lower receiving groove 62, and the pointed piercing knife can easily pierce the plate Scrap area cut open.

The surfaces where the two piercing knives 7 contact the bottom surface of the lower housing groove 62 are planes. As a modified embodiment, a spacer can be set between the piercing knife 7 and the bottom surface of the lower housing groove 62, and the piercing knife 7 can be pierced through the mold. The spacer provided on the top can quickly adjust the height of the mold piercing knife 7. During the adjustment, it only needs to be ground by an ordinary grinder and drilled by a milling machine. The process is simple, the processing cycle is short, and the cost is low.

As shown in FIG. 7 and FIG. 8 , the blank holder 4 is a square frame structure with four frames 41 , and two adjacent frames 41 are perpendicular to each other. Four frames 41 surround the integral protrusion formed by the two punches 6 , and the inner surfaces of each frame 41 are attached to one side surface of the protrusion respectively. As shown in FIG. 3 , a drawing bead 32 is provided on the working surface of the upper die 3 , and the drawing bead 32 is used to increase feeding resistance and control the speed of feeding. The drawbead 32 is a structure that protrudes downward on the working surface of the upper die 3, and correspondingly on the binder surface of the blank holder 4, a groove 42 that cooperates with the drawbead 32 is provided to draw the bead 32 during drawing forming. The ribs 32 are to be embedded in the grooves 42 .

As shown in FIG. 3 , the drawbead 32 is a closed structure extending along the contour of the punch opening of the die cavity 31 on the working surface of the upper die 3 , and the drawbead 32 is roughly in the shape of a rectangular ring. As preferably, as shown in Figure 9, two drawbeads 32 are provided on the working surface of the upper die 3, and the two drawbeads 32 are all closed structures, wherein the drawbeads 32 inside are located in the die cavity 31 between the punch mouth and the outside drawbead 32.

The drawing die for the inner panel of the B-pillar of the automobile is based on the computer simulation model, and is processed by numerical control equipment, so that the working surface of the convex and concave dies reaches a "mirror surface", and the drawing rib 32 on the upper die 3 is processed, and the upper die 3 is provided with two drawbeads 32 to ensure that the drawn part has sufficient elongation. Therefore, during drawing forming, the contact surface between the punch 6 and the material plate is large, and the feeding resistance between the blank holder 4 and the upper die 3 is uniform, thereby ensuring that the punch 6 can smoothly enter the cavity 31 of the die, so that the bottom and peripheral parts The material resistance is uniform; at the same time, the rigidity and strength of the B-pillar inner panel are improved, and the defects such as concave surface, twisted surface, slack and corrugation caused by elastic recovery are reduced, and the formability of the B-pillar inner panel can reach the best.

As shown in Figure 9, there is a certain distance between the two drawbeads 32 on the upper die 3, and the height of the drawbead 32 located on the inside is greater than the height of the drawbead 32 located on the outside, so as to adapt to the pressure of the pressing force. Variety.

As shown in FIG. 9 , the cross-sectional shape of the drawbead 32 on the upper die 3 is a semicircle, and the formed drawbead 32 is a semicircle bead.

As shown in Figure 7, there is a guide block 43 respectively at both ends of the length direction of the blank holder 4, and the guide block 43 is installed on the short frame 41 at both ends of the blank holder 4, and the guide block 43 is positioned at the width of the frame 41. At the center position in the direction, the two ends of the corresponding upper die 3 in the length direction respectively have a first sliding groove 34 for inserting the guide block 43 at one end of the blank holder 4 . As preferably, the shape of the guide block 43 is rectangular, and the corresponding first chute 34 is also a rectangular groove. On the opposite two sides of the guide block 43, a first guide plate 44 is provided, and the first guide plate 44 is used for matching with the second The two opposite inner surfaces of a chute 34 are in contact, on the one hand, it can play a guiding role, on the other hand, it can avoid the direct contact between the upper die 3 and the blank holder 4, and reduce the wear of the upper die 3 and the blank holder 4 . The first guide plate 44 is installed on the guide block 43 by bolts, which is convenient for replacement.

As shown in Figure 2, there is a second chute 35 for inserting the two long frames 41 of the blank holder 4 at both ends of the width direction of the upper mold 3, and the length of the second chute 35 is greater than that of the first chute. The length of a chute 34. The shape of the frame 41 is rectangular, and the corresponding second chute 35 is also a rectangular groove. The two ends of the lengthwise direction of the frame 41 are provided with a second guide plate 45. The contact of the opposite inner surfaces can on the one hand play a guiding role for the blank holder 4, and on the other hand prevent the frame 41 of the blank holder 4 from directly contacting the lower template 5, further reducing the number of blank holders 4 and the upper mold 3 wear and tear. The second guide plate 45 is installed on the frame 41 by bolts, which is convenient for replacement.

When the drawing die is drawing and forming the sheet material, the upper die 3 should be pressed down, the guide block 43 is matched with the first chute 34, and the frame 41 is matched with the second chute 35 to ensure that the upper die 3 and the blank holder The guiding accuracy of the linear movement of the ring 4 can improve the forming quality of the inner panel of the B-pillar and further improve the forming performance of the inner panel of the B-pillar.

As shown in Figure 2, the upper mold 3 is provided with a first chute 34 and a second chute 35, and a vertical sliding column 37 is respectively formed at the four corners, and the sliding column 37 is inserted into the end of the guide block 43 and the frame Between the ends of 41, it is in contact with the first guide plate 44 and the second guide plate 45.

As shown in FIG. 4 , each frame 41 of the blank holder 4 is provided with a locator 1 for locating the sheet. The locator 1 is arranged vertically. The structure of the locator 1 is shown in FIG. 10 . Because the height of the positioner 1 is relatively high, correspondingly, the upper die 3 is provided with an escape hole 33 for avoiding the positioner 1, and the avoidance hole 33 is a through hole through the upper die 3 in the vertical direction. In this embodiment, eight positioners 1 are provided in total, two are respectively provided on each frame 41 , and eight corresponding avoidance holes 33 are also provided.

As shown in Figures 1 and 4, the blank holder 4 is slidingly connected to the lower formwork 5 through several safety bolts 2, the safety bolts 2 are vertically arranged on the lower formwork 5, and the lower ends of the safety bolts 2 are fixedly connected to the lower formwork 5 , its upper end passes through the circular hole provided at the bottom of the blank holder 4, when the blank holder 4 goes up, the safety bolt 2 can play a role of safety protection.

The present invention has been exemplarily described above with reference to the accompanying drawings. Apparently, the specific implementation of the present invention is not limited by the above methods. As long as various insubstantial improvements are made using the method concept and technical solution of the present invention; or without improvement, the above-mentioned concept and technical solution of the present invention are directly applied to other occasions, all within the protection scope of the present invention within.

Claims (10)

1. A drawing mold for the inner panel of the B-pillar of an automobile, is characterized in that: comprise patrix, blank holder ring, lower formwork and be located on the lower formwork and the punch identical with the shape of the inner panel of automobile B-pillar, and the punch is provided with Two, the working surface of the upper mold is provided with a die cavity that matches the two punches, a piercing knife is provided between the two punches corresponding to the waste area of the sheet, and the inner wall of the die cavity is provided with a stabbing knife. The upper holding slot for broken knives. 2. The drawing die for the inner panel of the B-pillar of the automobile according to claim 1, characterized in that: the two punches are arranged on the lower template along the width direction of the lower template, and are symmetrical. 3. The stretching die for the inner panel of the B-pillar of an automobile according to claim 1 or 2, characterized in that: the two punches are connected into an integral structure, and the piercing knife is arranged at the joint between the two punches. area. 4. The drawing die for the inner panel of the B-pillar of the automobile according to claim 3, wherein there are two piercing knives in total, and the two piercing knives are arranged in a straight line along the length direction of the drawing die. 5 . The drawing die for the inner panel of the B-pillar of an automobile according to claim 4 , characterized in that: the connecting area is provided with a lower receiving groove for accommodating the piercing knife. 5 . 6 . The drawing die for the inner panel of the B-pillar of an automobile according to claim 5 , wherein the piercing knife is a pointed piercing knife. 7 . 7. The drawing die for the inner panel of the B-pillar of the automobile according to claim 6, characterized in that: the two ends of the blank holder have guide blocks, and the two ends of the upper die have a first chute for inserting the guide blocks . 8 . The drawing die for the inner panel of the B-pillar of an automobile according to claim 7 , wherein the other two ends of the upper die have second slide grooves for inserting the two opposite frames of the blank holder. 9. The drawing die for the inner panel of the B-pillar of the automobile according to claim 8, wherein a locator for positioning the sheet is vertically provided on the blank holder. 10. The drawing die for the inner panel of the B-pillar of the automobile according to claim 9, wherein the blank holder is slidably connected with the lower formwork through safety bolts.