Universal vehicle shell hydraulic deep drawing forming die and press machine

Abstract

The utility model relates to a general vehicle shell hydraulic deep drawing forming die and a press machine, the die comprises a convex die core which is detachably and fixedly connected to an upper die, a concave die insert which is detachably connected to the inner wall of a lower die, a step-shaped limiting guide column which is detachably connected to the inner bottom surface of a lower die cavity, and an ejector block of which the bottom is provided with a hole, and the ejector block can be inserted into the step-shaped upper end part of the limiting guide post through the hole to form a guide post and guide sleeve type matched guide structure. A spring is fixedly connected in the lower die bottom groove, and the bottom of the ejector block is fixedly connected to the upper end of the spring. A heating device I is arranged in the tubular cavity in the bottom of the lower die, and a heating device II is arranged in the tubular cavity in the side wall of the lower die. The press machine comprises the general vehicle shell hydraulic deep drawing forming die, the blank holder is connected with the outer sliding block of the press machine, and the upper die is connected with the inner sliding block of the press machine. Therefore, the mould has multiple functions.

Description

Technical Field

[0001] The utility model relates to a forging die technology, in particular to a universal vehicle shell hydraulic deep drawing forming sheet metal die and a press. Background Art

[0002] There are some difficult problems that need to be solved urgently in production today: one is that as the automobile industry continues to intensify its internal competition, it is bound to continuously reduce costs. In the production of the automobile industry, it is encountered that in the production of hydraulic deep drawing sheet metal for car shells in the same batch or different batches, although the slab products to be produced are different in model, there are only slight differences between the slab products. In this case, if different molds are designed for each model, that is, different slab products, the cost will be very high, and it will also increase production costs and time. For this reason, whether it is possible to design a universal hydraulic deep drawing sheet metal mold for car shells has become a problem that needs to be solved urgently. Figure 4 , 5 The several car shells Ⅰ24-1, Ⅱ24-2, and Ⅲ24-3 shown in 6 have this feature. That is, the main structure is basically the same, but there are slight differences in individual minor details. In another case, in actual production, for slabs of different materials such as steel plates, magnesium alloys, aluminum alloys, titanium alloys, and high-temperature alloy plates, molds that require heating conditions or molds that do not require heating conditions will be used. In this way, the cost of designing and using several sets of molds will be very high. Therefore, how to design a universal mold that can be heated or not, find a solution to reduce the cost of the mold, and reduce the labor intensity of workers removing and changing molds in production has become an urgent issue to be solved. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide a universal vehicle shell hydraulic deep drawing forming die.

[0004] According to one aspect of the utility model, a universal vehicle shell hydraulic deep drawing forming die is provided, comprising: a male die core detachably fastened to an upper die, a female die insert detachably connected to an inner wall of a lower die, a step-shaped limiting guide column detachably connected to an inner bottom surface of a lower die cavity, and a top piece block with a hole at the bottom, wherein the top piece block can be inserted into the step-shaped upper end portion of the limiting guide column through the hole to form a guide column and guide sleeve type matching guide structure.

[0005] Preferably, a heating device I is provided in the tubular cavity at the bottom of the lower mold, and a heating device II is provided in the tubular cavity on the side wall of the lower mold.

[0006] Preferably, the universal vehicle shell hydraulic drawing forming die also includes: a pressure ring arranged corresponding to the punch core, wherein an inner slide plate is connected to the outer sides of the upper die, and an outer slide plate is connected to the inner side of the pressure ring, and the inner slide plate and the outer slide plate constitute a guiding structure for the upper die and the lower die.

[0007] Preferably, a blank holder ring insert is connected and arranged below the blank holder ring.

[0008] Preferably, a convex drawing rib is provided at the lower side of the pressure ring insert, and a corresponding pit is provided at the die insert.

[0009] Preferably, the universal vehicle shell hydraulic deep drawing forming die further comprises: a guide sleeve embedded in the through hole of the blank holder, and connected to a guide column on the upper plane of the lower die, wherein the guide column and the guide sleeve constitute a guiding structure for the blank holder and the lower die.

[0010] Preferably, the universal vehicle shell hydraulic deep drawing forming die further comprises a groove plate sealedly connected to the side wall of the lower die, and the groove plate, the lower die and the concave die insert form an oil groove.

[0011] Preferably, a spring is fixedly connected in the groove on the bottom surface of the lower mold, and the bottom of the top piece block is fixedly connected to the upper end of the spring.

[0012] According to another aspect of the utility model, a press is provided, comprising the above-mentioned universal vehicle shell hydraulic deep drawing forming die, wherein the blank holder is connected to the outer slide of the press, and the upper die is connected to the inner slide of the press.

[0013] Preferably, the press also includes a robot for picking up and placing the slab relative to the upper plane of the lower die.

[0014] In this way, by taking advantage of the characteristics of metal sheet hydraulic forming, only a few forming parts need to be replaced during use to be applied to several different models and different plate blank products with only slight differences from each other, so that the production cost of automobile molds can be continuously compressed and reduced, and one mold can be used for multiple purposes. In addition, the mold can be set so that only some forming parts need to be replaced during cleaning, and it can be used with or without heating. These advantages also help shorten the production cycle, and it is a technical solution worth learning from in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The upper and lower mold opening states of a universal vehicle shell hydraulic deep drawing mold are schematically shown.

[0016] Figure 2 A diagram schematically shows a first form type of the hydraulic deep drawing die.

[0017] Figure 3 A diagram schematically shows a second embodiment of the hydraulic deep drawing tool.

[0018] Figure 4 A first forming form or pattern diagram of a metal sheet blank is schematically shown.

[0019] Figure 5A second forming form or pattern diagram of a metal sheet blank is schematically shown.

[0020] Figure 6 A third forming form or pattern diagram of a metal sheet blank is schematically shown.

[0021] Figure 7 The schematic diagram shows the state when the spring pushes up the top piece block. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The exemplary embodiments described below and shown in the accompanying drawings are intended to teach the principles of the present invention, so that those skilled in the art can implement and use the present invention in several different environments and for several different applications. Therefore, the scope of protection of the present invention is defined by the attached claims, and the exemplary embodiments are not intended to be, and should not be considered to be, a restrictive description of the scope of protection of the present invention. Moreover, for the convenience of description, the sizes of the various parts shown in the accompanying drawings are not necessarily drawn according to the actual proportional relationship, and the orientation description, such as the orientation or position relationship indicated by the inside, outside, top, bottom, left, right, top, bottom, etc., are all based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 invention. Throughout the accompanying drawings, the same elements are represented by the same or similar figure marks. Conventional structures or local structures will be omitted when they may cause confusion or difficulty in observing and understanding the understanding of the present disclosure. Unless otherwise specifically stated, the order and numerical values ​​of components and assembly steps set forth in the embodiments do not limit the scope of the present invention.

[0023] According to the embodiment of the utility model, a universal hydraulic deep drawing die for a car body mainly includes an upper die part and a lower die part, wherein the upper die part includes: an upper die 1, a punch core 3, an inner slide plate 4, an outer slide plate 5, a blank holder 8, a blank holder insert 9, and a guide sleeve 27 arranged corresponding to the punch core 3. The lower die part includes: hydraulic oil 10, a groove plate 11, a sealing ring 12, a die insert 14, a lower die 15, a spring 17, a limit guide column 19, a top piece block 21, a heating device I 18, a heating device II 22, a drawing rib 23, and a guide column 26.

[0024] More specifically, the upper die 1 and the punch core 3 are detachably connected by connecting bolts Ⅰ2, the inner slide plate 4 is connected to the outer side of the upper die 1 by connecting bolts Ⅱ20, and the outer slide plate 5 is connected to the inner side of the blank holder 8 by connecting bolts Ⅲ6. Between the inner slide plate 4 and the outer slide plate 5, the upper die 1 and the lower die 15 are guided. The guide stroke is designed to be not less than 50mm.

[0025] The blank holder insert 9 is connected to the bottom of the blank holder 8 by connecting bolts IV7. The guide sleeve 27 is embedded in the ground through hole of the blank holder 8, and the connecting bolts VII25 connect the guide column 26 to the upper plane of the lower die 15. The guide column 26 and the guide sleeve 27 play a guiding role for the blank holder 8 and the lower die 15.

[0026] Hydraulic oil 10 is contained in an oil groove formed by the lower die 15 , the die insert 14 , and the groove plate 11 .

[0027] The groove plate 11 can be a sheet metal formed part riveted to the side wall of the lower mold 15, and the sealing ring 12 is placed outside the side wall of the lower mold 15 and in the cavity inside the groove plate 11 to prevent the hydraulic oil 10 from leaking from the gap between the two.

[0028] The female die insert 14 is detachably connected to the inner wall of the lower die 15 via connecting bolts V13.

[0029] The limiting guide column 19 is detachably connected to the bottom surface of the cavity of the lower mold 15 through the connecting bolt VI16, and plays a mechanical limiting role on the top piece block 21 to prevent the workpiece 24 from being crushed due to excessive limit. There is a hole at the bottom of the top piece block 21, and the stepped upper end of the limiting guide column 19 can be inserted to form a guide column and guide sleeve type fit to play a guiding role.

[0030] The bottom of the ejector block 21 is fixed to the upper end of the spring 17 , and the spring 17 is fixed to the bottom groove of the lower die 15 . The ejector block 21 can lift the slab 24 with the help of the elastic force of the spring 17 .

[0031] The heating device I18 is located in the tubular cavity at the bottom of the lower mold 15 for heating, and the heating device II22 is located in the tubular cavity on the side wall of the lower mold 15.

[0032] The drawing rib 23 is a boss located on the blank holder insert 9, so that the edge of the compacted slab 24 can be pressed between the recess of the die insert 14 to prevent the sheet metal slab from slipping under the action of force in the forming cavity.

[0033] When the mold is in use, only some of the forming parts, namely the punch core 3, the die insert 14, the limit guide column 19, and the top piece block 21, can be replaced when the mold is cleaned as needed, so that products with different shapes can be formed. This continuously compresses the mold production cycle, reduces the production cost of automobile molds, and shortens the product production cycle. It is a good idea worthy of reference and learning from in production, which can achieve the purpose of mold versatility.

[0034] On the other hand, the purpose of designing the heating device I18 and the heating device II22 is to selectively apply them according to the use needs of the mold, that is, if a heated mold is used, it can be heated, or if the mold does not need to be heated, it can be not heated. Note that when using the heating function, the hydraulic oil 10 must be a high temperature resistant hydraulic oil, which increases the flexibility of the mold. Truly achieve the purpose of one mold with multiple uses. Figure 1 , 2 , mold diagram shown in 3.

[0035] As an example, the operation flow of the present die is shown. The die is a drawing die mounted on a double-action press.

[0036] The first step S1, such as Figure 1 , 2 3. The upper die 1 and the lower die 15 of the mold are in the open mold state. First, the robot puts the slab 24 with lubricating oil on the surface onto the upper plane of the lower die 15. Then, the upper die edge ring 8 connected to the outer slide of the press moves downward under the drive of the outer slide of the press. Under the guidance of the guide column 26 and the guide sleeve 27, the edge ring 8 falls on the upper surface of the slab 24. At the same time, after being compacted by the drawing rib 23, the inner slide 4 and the outer slide 5 guide the upper die 1 and the lower die 15. Note that the guide stroke design should not be less than 50mm. Subsequently, driven by the inner slide of the press, the upper die 1 connected to the inner slide of the press moves downward. Under the dual action of the punch core 3 and the hydraulic oil 10, the slab 24 is gradually formed and drawn. Here, the pressing speed of the upper die 1 should be strictly controlled to prevent the hydraulic oil from overflowing the groove plate 11. The lower surface of the slab 24 gradually contacts the upper surface of the top piece 21, the spring 17 is compressed, and the limit guide pin 19 acts as a mechanical limit, which limits the top piece 21 to prevent the workpiece 24 from being crushed due to excessive limit. The top piece 21 has a hole at the bottom, which can be inserted into the upper end of the step-shaped limit guide pin 19 to form a guide pin guide sleeve to play a guiding role. Finally, the deep drawing process of the slab 24 is completed.

[0037] In the second step S2, after the deep drawing is completed, the punch core 3 of the upper die 1 is demoulded upward under the drive of the inner slide of the press. At the same time, the blank holder 8 of the upper die 1 is lifted upward under the drive of the outer slide of the press. Under the spring pressure of the spring 17, the slab 24 is lifted up. Then the robot grabs the slab 24, completing a deep drawing cycle.

[0038] Thus, this deep drawing die set on the double-action press has the following advantages:

[0039] 1) The forming limit is improved, reducing the number of workpiece forming times, as well as the number and cost of supporting molds.

[0040] 2) The rebound elasticity of the formed parts is small, the generation of internal wrinkles is suppressed, and the surface quality and dimensional accuracy of the workpiece are improved.

[0041] 3) The mold has a simple structure, low processing precision requirements, good versatility, and a small number of matching parts, which is very suitable for the requirements of modern small-batch, multi-variety flexible processing.

[0042] 4) Due to the application of liquid, some materials that are difficult to form at room temperature can be formed, such as magnesium alloys, aluminum alloys, titanium alloys, high-temperature alloys, and complex structure welded plates.

[0043] 5) Parts with complex shapes can be processed.

[0044] 6) The forming method of this type of parts can be achieved by combining liquid deep drawing with local key feature rigid die shaping. This method not only takes advantage of the uniform deformation and good forming performance of the liquid-filled forming blank, but also takes advantage of the local small features of the rigid die forming, and can achieve sequential and precise forming of complex features.

[0045] 7) Automobile exterior panels have high requirements for surface quality. Since aluminum alloy is relatively soft, traditional stamping processes can easily cause scratches, wrinkles, slip lines and other defects on the surface of parts. Special processes must be added in the subsequent process to eliminate scratches. Liquid filling molding uses high-pressure fluid media instead of rigid molds, reducing the friction between the material surface and the rigid mold.

[0046] 8) The working edge surfaces of the die and the pressure ring are made of inserts to increase the life of the mold.

[0047] 9) The blank holder 8 and the punch are guided by the inner slide plate 4 and the outer slide plate 5. This structural mold has a simpler structure, is easier to process, and has a better guiding effect.

[0048] 10) Drawing parts are generally provided with drawing ribs at the parts where the material flows easily, so as to control the material to flow evenly into the die. Here, the drawing ribs are, for example, protrusions arranged at the bottom of the blank holder insert 9, and corresponding pits are arranged at the die insert 14, which can press the slab to prevent the slab metal from sliding and deviating under the drawing and pressing of the upper die.

[0049] In the description of the present application, "multiple" means two or more than three, unless otherwise clearly and specifically defined. Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Although the present invention has been described with reference to various specific embodiments, it should be understood that variations can be made within the spirit and scope of the concept of the described utility model. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. A universal vehicle shell hydraulic deep drawing die, characterized in that: include: A male die core (3) is detachably fastened to an upper die (1), a female die insert (14) is detachably connected to the inner wall of a lower die (15), a step-shaped limiting guide post (19) is detachably connected to the bottom surface of the cavity of the lower die (15), and a top piece (21) has a hole at the bottom, wherein the top piece (21) can be inserted into the step-shaped upper end of the limiting guide post (19) through the hole to form a guide post and guide sleeve matching guide structure.

2. The universal vehicle shell hydraulic deep drawing die according to claim 1, characterized in that: A heating device I (18) is arranged in the tubular cavity at the bottom of the lower mold (15), and a heating device II (22) is arranged in the tubular cavity on the side wall of the lower mold (15).

3. The universal vehicle shell hydraulic deep drawing die according to claim 1 or 2, characterized in that: Also includes: A pressure ring (8) is arranged corresponding to the punch core (3), wherein an inner slide plate (4) is connected to the outer side surfaces of the upper mold (1), and an outer slide plate (5) is connected to the inner side surface of the pressure ring (8), and the inner slide plate (4) and the outer slide plate (5) constitute a guiding structure for the upper mold (1) and the lower mold (15).

4. The universal vehicle shell hydraulic deep drawing die according to claim 3, characterized in that: A blank holding ring insert (9) is connected and arranged below the blank holding ring (8).

5. The universal vehicle shell hydraulic deep drawing die according to claim 4, characterized in that: A protruding drawing rib (23) is provided at the bottom of the blank holder insert (9), and a corresponding recess is provided at the die insert (14).

6. The universal vehicle shell hydraulic deep drawing die according to claim 3, characterized in that: Also includes: A guide sleeve (27) embedded in the through hole of the blank holder (8) is connected to a guide post (26) on the upper plane of the lower die (15), wherein the guide post (26) and the guide sleeve (27) constitute a guiding structure for the blank holder (8) and the lower die (15).

7. The universal vehicle shell hydraulic deep drawing die according to claim 1 or 2, characterized in that: It also includes a groove plate (11) which is sealingly connected to the side wall of the lower die (15), and the groove plate (11) and the lower die (15) and the die insert (14) form an oil groove.

8. The universal vehicle shell hydraulic deep drawing die according to claim 1 or 2, characterized in that: A spring (17) is fixedly connected in the bottom groove of the lower die (15), and the bottom of the top piece block (21) is fixedly connected to the upper end of the spring (17).

9. A press machine, characterized in that: A universal vehicle shell hydraulic deep drawing die comprising any one of claims 3 to 8, wherein the blank holder (8) is connected to an outer slide of a press, and the upper die (1) is connected to an inner slide of the press.

10. The press according to claim 9, characterized in that It also includes a robot for picking up and placing the slab (24) relative to the upper plane of the lower mold (15).

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