Forming die for the upper shell of automobile battery box

Abstract

The present invention discloses a forming die for the upper shell of an automobile battery box, wherein a first stretching die assembly for first stretching a segment with a maximum height portion on the upper shell of the automobile battery box, a second stretching die assembly for second stretching for integrally forming the upper shell of the automobile battery box, and a shaping die assembly for shaping the corners of the formed product to an arc transition are sequentially arranged between the upper die assembly and the lower die assembly, wherein the first upper die of the first stretching die assembly, the second upper die of the second stretching die assembly, and the shaping upper die of the shaping die assembly are all connected to the upper die assembly, and the first lower die of the first stretching die assembly, the second lower die of the second stretching die assembly, and the shaping lower die of the shaping die assembly are all connected to the lower die assembly. Therefore, it greatly improves production efficiency, saves production costs, avoids welding defects, and also avoids the risk of airtight leakage.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, in particular to an integrated mould for an upper shell of a car battery box. Background Art

[0002] At present, as people's environmental awareness is getting stronger and stronger, more and more people choose new energy electric vehicles as their means of transportation. As an important component in electric vehicles, the battery box is the main body of the battery pack. It must have sufficient strength to fix the battery pack, and it must also have dustproof and beautiful functions. Usually the battery box includes an upper shell and a lower shell, which are fixedly connected.

[0003] As attached Figure 1 and attached Figure 2 The upper shell of the automobile battery box shown in the figure can be divided into three sections, namely, section 1-1, section 2-2 and section 3-3. The highest point of the product of section 1-1 can reach 304.7 mm, and the height difference of the first step product at the connection between section 2-2 and section 1-1 can reach 150 mm. The height difference of the second step of the product at the leftmost end of section 1-1 is 76 mm, and the height difference of the third step product at the connection between section 2-1-2 and section 3-1-3 is 39 mm. The shallowest height of the product of section 3-3 is only 111.7 mm, and the connection between section 3-1-3 and section 2-2 has a right angle corner 1-4 in the horizontal direction, and the material thickness of the whole product is only 0.8 mm. From the above description, it can be seen that the structure of the upper shell of the battery box is very complex, and it is a thin-walled irregular shell part.

[0004] In the prior art, the processing technology of the above-mentioned thin-walled irregular shell parts is usually to decompose it into two or more sections in the length direction, and after each section is formed by stretching, these segmented parts are welded and assembled into one. Therefore, its disadvantages are: on the one hand, each segmented part needs a stretching mold, so there are many molds and the manufacturing cost is very high; on the other hand, each segmented part has a stretching margin when stretched, so there is too much waste in the use of materials, and the utilization rate of materials is too low, which further increases the production cost; on the other hand, welding defects are easy to occur during welding, such as uneven welds or insufficient airtightness, thereby reducing the airtightness of the battery box. In this way, gas or liquid will enter the battery box through the pores, thereby affecting the normal operation of the battery. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a molding die for an upper shell of an automobile battery box which is formed in one piece and can save materials, reduce manufacturing costs, and eliminate pores on the product surface, thereby improving product quality.

[0006] In order to solve the above technical problems, the present invention provides a forming mold for the upper shell of an automobile battery box, comprising an upper mold assembly and a lower mold assembly, wherein a first stretching mold assembly, a second stretching mold assembly and a shaping mold assembly are arranged in sequence between the upper mold assembly and the lower mold assembly, wherein the first upper mold of the first stretching mold assembly, the second upper mold of the second stretching mold assembly and the shaping upper mold of the shaping mold assembly are all connected to the upper mold assembly, and the first lower mold of the first stretching mold assembly, the second lower mold of the second stretching mold assembly and the shaping lower mold of the shaping mold assembly are all connected to the lower mold assembly; the first stretching mold assembly is used for the first stretching of the section with the maximum height on the upper shell of the automobile battery box, the second stretching mold assembly is used for the second stretching of the overall forming of the upper shell of the automobile battery box, and the shaping mold assembly is used for shaping the corners of the formed product to make arc transitions.

[0007] The first upper die and the first lower die of the first stretching die assembly are combined to form a preliminary cavity of the upper shell section of the automobile battery box, and a convex cavity higher than the product size is provided at the highest point on the right side of the preliminary cavity. The corresponding first upper die has a height dimension in the inner concave cavity of the convex cavity that is greater than the final molding size of the product, and a width dimension that is greater than the final molding size of the product, and the bottom of the inner concave cavity at this location is an arc-shaped transition, and the cavity mouth of the inner concave cavity is also an arc-shaped transition.

[0008] The protruding height of the convex cavity is reduced to the post-molding size during the subsequent molding of the second stretching die assembly, and the material in the convex cavity is added to the vertical step surface of the first step at the connection between the first and second shell sections of the automobile battery box.

[0009] The second upper mold and the second lower mold of the second stretching mold assembly are combined to form an integral cavity of the upper shell of the automobile battery box. The second upper mold at the vertical step surface of the first step at the connection between product segments one and two is provided with an outwardly protruding stretching and wrinkling rib, and the stretching and wrinkling rib extends along the length direction of the product, extending from the vertical step surface to the top surface of segment two; the corresponding second lower mold is provided with an inwardly concave stretching and wrinkling groove matching the stretching and wrinkling rib at the corresponding position of the second upper mold.

[0010] There are two stretching wrinkle-absorbing ribs, which are respectively close to two side edges of the product.

[0011] The second upper die and the second lower die of the second stretching die assembly are combined to form an integral cavity of the upper shell of the automobile battery box, and the integral cavity has a right-angle corner at the connection between product segments two and three; the second stretching die assembly at the right-angle corner is provided with a pressure plate and a pressure ring, the pressure ring is connected to the second lower die, and the pressure plate is connected to the second upper die; a convex surface is provided on the side of the pressure plate facing the pressure ring, and a part of the edge of the convex surface close to the integral cavity forms the bottom edge shape of the right-angle corner of the product cavity, and the pressure ring is provided with a groove that matches the rest of the convex surface of the pressure plate.

[0012] The groove wall of the groove on the blank holder ring is an arc-shaped transition, and the groove bottom is a through hole that penetrates the thickness of the blank holder ring.

[0013] The shaping lower mold of the shaping mold assembly is provided with an anti-ridge strip at the bottom edge of the right-angle corner where product segments two and three are connected, and the arc shape of the transition edge of the shaping upper mold at product segment two near segment three is flatter than the arc shape of the transition edge at this point of the final product, and outwardly protruding shaping wrinkle suction ribs are provided at segment three near the right-angle corner, and the shaping wrinkle suction ribs are in an arc shape along the edge of the right-angle corner, and the corresponding shaping lower mold is provided with a shaping wrinkle suction groove at the matching position of the shaping wrinkle suction ribs.

[0014] Compared with the prior art, the above molding die has the following advantages:

[0015] 1) Since the upper shell of the automobile battery box is formed in one piece, the molding process is greatly reduced, and the welding and airtightness testing processes are reduced. Therefore, on the one hand, it greatly improves the production efficiency; on the other hand, it reduces multiple molds and the testing costs required for airtightness testing, which greatly saves production costs; on the other hand, it avoids material waste to a greater extent, thereby further saving production costs; on the other hand, the upper shell of the automobile battery box after molding has better integrity, avoids welding defects, and avoids the risk of airtight leakage.

[0016] 2) After the first stretching molding of the first stretching die assembly, the bulge at the highest point of the product segment one is caused by the fact that there is not enough material on the vertical step surface at the connection between segment one and segment two after the one-piece molding, which causes cracking after the second stretching. In order to eliminate the cracking at the connecting step surface, the extra bulge after the first stretching stores the material to be drawn during the second stretching. Therefore, the excess material at the position prone to cracking is replenished in time after drawing during the second stretching, thereby eliminating the cracking phenomenon.

[0017] 3) The upper die of the second stretching die assembly is provided with wrinkle suction ribs at the connection between product segments one and two. This is because the connection is stretched, heightened and widened once, resulting in excess material in the lateral direction. However, heightening and widening are requirements for solving the cracking phenomenon, and these two requirements are contradictory. Therefore, in order to resolve this contradiction and consume the excess material, wrinkle suction ribs are provided on the upper die, and the corresponding lower die is provided with wrinkle suction grooves to eliminate wrinkling.

[0018] 4) The biggest problem of the product lies at the right-angle corner where the second and third segments are connected. The drawing depth here can reach 111.7 mm, and it is a right-angle corner. The material shortage during molding is very serious. Therefore, this mold is equipped with a blank holder and a pressure plate here. The blank holder is equipped with a groove at the place where there is material shortage at the corner. Before drawing, the pressure plate will first move a part of the material to the cracked area when pressing the material, so that the material can be supplemented to the cracked position during drawing, thereby eliminating the cracking phenomenon at the bottom edge of the corner.

[0019] 5) The shaping die is designed with an anti-ridge strip at the bottom edge of the right-angle corner because a part of the material is stored at the step corner where the second segment is connected to the third segment at the beginning of drawing, which aggravates the problem of multiple materials and forms stacked materials. Therefore, an anti-ridge strip is installed on the lower die of the shaping die to first block the material from extending outward, and then the excess material is pulled upward through the shaping die, thereby forming an edge transition of the second segment close to the third segment to meet the requirements of the final product; in addition, the setting of the arc-shaped wrinkle absorption ribs on the third segment further absorbs the excess material, so that the surface of the product can better meet the quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the parts structure of the upper shell of the automobile battery box involved in the present invention.

[0021] Figure 2 It is a schematic diagram of the parts structure of the upper shell of the automobile battery box involved in the present invention.

[0022] Figure 3 It is a structural schematic diagram of the first stretching die assembly in the forming die of the upper shell of the automobile battery box of the present invention.

[0023] Figure 4 It is a schematic cross-sectional structural diagram of the first stretching die assembly in the present invention.

[0024] Figure 5 It is a structural schematic diagram of the second stretching die assembly in the molding die of the upper shell of the automobile battery box of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the lower die assembly of the second stretching die assembly in the present invention.

[0026] Figure 7 It is a schematic structural diagram of the upper die assembly of the second stretching die assembly in the present invention.

[0027] Figure 8 It is a schematic cross-sectional structural diagram of the second stretching die assembly in the present invention.

[0028] Fig. 9 It is a schematic structural diagram of the pressing plate of the second stretching die assembly in the present invention.

[0029] Fig.10 It is a schematic structural diagram of the blank holder ring of the second stretching die assembly in the present invention.

[0030] Fig.11 It is a structural schematic diagram of a shaping mold assembly in a molding mold for an upper shell of an automobile battery box of the present invention.

[0031] Fig.12 It is a schematic structural diagram of the shaping mold assembly at a right-angle corner in the present invention.

[0032] Among them: 1. upper shell of automobile battery box; 1-1. segment one; 1-2. segment two; 1-3. segment three; 1-4. right-angle corner; 2. first stretching die assembly; 2-1. first upper die; 2-2. first lower die; 2-3. plate; 2-4. convex cavity; 3. second stretching die assembly; 3-1. second upper die; 3-2. second lower die; 3-3. stretching wrinkle absorption groove; 3-4. pressing plate; 3-5. edge pressing ring; 3-6. stretching wrinkle absorption strip; 3-7. convex surface; 3-8. groove; 3-9. through hole; 4. shaping die assembly; 4-1. shaping upper die; 4-2. shaping lower die; 4-3. anti-ridge strip. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Combination Figures 1 to 12 As shown in the structural schematic diagram of the forming mold of the upper shell of the automobile battery box of the present invention, it can be seen that the mold comprises an upper mold assembly and a lower mold assembly, wherein a first stretching mold assembly 2, a second stretching mold assembly 3 and a shaping mold assembly 4 are sequentially arranged between the upper mold assembly and the lower mold assembly, wherein the first upper mold 2-1 of the first stretching mold assembly 2, the second upper mold 3-1 of the second stretching mold assembly 3 and the shaping upper mold 4-1 of the shaping mold assembly 4 are all connected to the upper mold assembly, and the first lower mold 2-2 of the first stretching mold assembly 2, the second lower mold 3-2 of the second stretching mold assembly 3 and the shaping lower mold 4-2 of the shaping mold assembly 4 are all connected to the lower mold assembly; the first stretching mold assembly 2 is used for the first stretching of the segment 1-1 with the maximum height part on the upper shell 1 of the automobile battery box, the second stretching mold assembly 3 is used for the second stretching of the overall forming of the upper shell 1 of the automobile battery box, and the shaping mold assembly 4 is used for shaping the corners of the formed product to make arc transitions.

[0035] The first upper die 2-1 and the first lower die 2-2 of the first stretching die assembly 2 are molded together to form a preliminary cavity of a section 1-1 of the upper shell body 1 of the automobile battery box, and a convex cavity 2-4 higher than the product size is provided at the highest point on the right side of the preliminary cavity, and the corresponding first upper die has a height dimension in the inner concave cavity of the convex cavity 2-4 that is greater than the final molding size of the product, a width dimension that is greater than the final molding size of the product, and the bottom of the inner concave cavity at this location is an arc-shaped transition, and the cavity mouth of the inner concave cavity is also an arc-shaped transition.

[0036] The protruding height of the convex cavity 2-4 is reduced to the post-molding size during the subsequent molding of the second stretching die assembly 3, and the material in the convex cavity 2-4 is added to the vertical step surface of the first step at the connection between section 1-1 and section 2-1-2 of the upper shell 1 of the automobile battery box.

[0037] The second upper mold 3-1 and the second lower mold 3-2 of the second stretching mold assembly 3 are molded together to form an integral cavity of the upper shell 1 of the automobile battery box. The upper mold at the vertical step surface of the first step at the connection between the product segment 1-1 and the segment 2-1-2 is provided with an outwardly protruding stretching and wrinkling rib 3-6. The stretching and wrinkling rib 3-6 extends along the length direction of the product, from the vertical step surface to the top surface of the segment 2-1-2; the corresponding second lower mold 3-2 is provided with an inwardly concave stretching and wrinkling groove 3-3 matching the stretching and wrinkling rib 3-6 at the position corresponding to the second upper mold 3-1.

[0038] There are two stretching wrinkle-absorbing ribs 3-6, which are respectively close to two side edges of the product.

[0039] The second upper mold 3-1 and the second lower mold 3-2 of the second stretching mold assembly 3 are molded together to form an integral cavity of the upper shell 1 of the automobile battery box, and the integral cavity has a right-angle corner 1-4 at the connection between the product segment two 1-2 and the segment three; the second stretching mold assembly 3 at the right-angle corner 1-4 is provided with a pressure plate 3-4 and a pressure ring 3-5, the pressure ring 3-5 is connected to the second lower mold 3-2, and the pressure plate 3-4 is connected to the second upper mold 3-1; the pressure plate 3-4 is provided with a convex surface 3-7 on the side facing the pressure ring 3-5, and the convex surface 3-7 is close to a part of the edge of the integral cavity to form the bottom edge shape of the right-angle corner 1-4 of the product cavity, and the pressure ring 3-5 is provided with a groove 3-8 matching the rest of the convex surface 3-7 of the pressure plate 3-4.

[0040] The groove wall of the groove 3-8 on the pressure ring 3-5 is an arc-shaped transition, and the groove bottom is a through hole 3-9 that penetrates the thickness of the pressure ring 3-5.

[0041] The shaping lower mold 4-2 of the shaping mold assembly 4 is provided with an anti-ridge strip 4-3 at the bottom edge of the right-angle corner 1-4 connecting the product segment two 1-2 and the segment three 1-3, and the arc shape of the transition edge of the shaping upper mold 4-1 at the product segment two 1-2 near the segment three 1-3 is flatter than the arc shape of the transition edge at this point in the final product, and an outwardly protruding shaping wrinkle suction rib is provided at the segment three 1-3 near the right-angle corner 1-4, and the shaping wrinkle suction rib is in an arc shape along the edge of the right-angle corner 1-4, and the corresponding shaping lower mold 4-2 is provided with a shaping wrinkle suction groove at the matching position of the shaping wrinkle suction rib.

[0042] The above is only a preferred feasible implementation example of the present invention, which cannot limit the scope of rights of the present invention. For those skilled in the art, all other corresponding changes made using the technical solutions and technical concepts of the present invention should fall within the scope of protection of the claims of the present invention.

Claims

1. A molding die for an upper shell of an automobile battery box, comprising an upper mold assembly and a lower mold assembly, characterized in that: A first stretching die assembly, a second stretching die assembly and a shaping die assembly are sequentially arranged between the upper die assembly and the lower die assembly, wherein the first upper die of the first stretching die assembly, the second upper die of the second stretching die assembly and the shaping upper die of the shaping die assembly are all connected to the upper die assembly, and the first lower die of the first stretching die assembly, the second lower die of the second stretching die assembly and the shaping lower die of the shaping die assembly are all connected to the lower die assembly; the first stretching die assembly is used for the first stretching of the segment 1 with the maximum height part on the upper shell of the automobile battery box, the second stretching die assembly is used for the second stretching of the overall forming of the upper shell of the automobile battery box, and the shaping die assembly is used for shaping the corners of the formed product for arc transition; The first upper die and the first lower die of the first stretching die assembly are combined to form a primary mold cavity of the upper shell section 1 of the automobile battery box, and a convex cavity higher than the product size is provided at the highest point on the right side of the primary mold cavity, and the corresponding first upper die has a height dimension greater than the final molding size of the product in the inner concave cavity of the convex cavity, a width dimension greater than the final molding size of the product, and the cavity bottom of the inner concave cavity at this location is an arc-shaped transition, and the cavity mouth of the inner concave cavity is also an arc-shaped transition; The second upper mold and the second lower mold of the second stretching mold assembly are combined to form an integral cavity of the upper shell of the automobile battery box. The second upper mold at the vertical step surface of the first step at the connection between product segments one and two is provided with an outwardly protruding stretching and wrinkling rib, and the stretching and wrinkling rib extends along the length direction of the product, extending from the vertical step surface to the top surface of segment two; the corresponding second lower mold is provided with an inwardly concave stretching and wrinkling groove matching the stretching and wrinkling rib at the corresponding position of the second upper mold.

2. The molding die for the upper shell of the automobile battery box according to claim 1, characterized in that: The protruding height of the convex cavity is reduced to the post-molding size during the subsequent molding of the second stretching die assembly, and the material in the convex cavity is added to the vertical step surface of the first step at the connection between the first and second shell sections of the automobile battery box.

3. The molding die for the upper shell of the automobile battery box according to claim 1, characterized in that: There are two stretching wrinkle-absorbing ribs, which are respectively close to two side edges of the product.

4. The molding die for the upper shell of the automobile battery box according to claim 1, characterized in that: The second upper die and the second lower die of the second stretching die assembly are combined to form an integral cavity of the upper shell of the automobile battery box, and the integral cavity has a right-angle corner at the connection between product segments two and three; the second stretching die assembly at the right-angle corner is provided with a pressure plate and a pressure ring, the pressure ring is connected to the second lower die, and the pressure plate is connected to the second upper die; a convex surface is provided on the side of the pressure plate facing the pressure ring, and a part of the edge of the convex surface close to the integral cavity forms the bottom edge shape of the right-angle corner of the integral cavity, and the pressure ring is provided with a groove that matches the rest of the convex surface of the pressure plate.

5. The molding die for the upper shell of the automobile battery box according to claim 4, characterized in that: The groove wall of the groove on the blank holder ring is an arc-shaped transition, and the groove bottom is a through hole that penetrates the thickness of the blank holder ring.

6. The molding die for the upper shell of the automobile battery box according to claim 1, characterized in that: The shaping lower mold of the shaping mold assembly is provided with an anti-ridge strip at the bottom edge of the right-angle corner where product segments two and three are connected, and the arc shape of the transition edge of the shaping upper mold at product segment two near segment three is flatter than the arc shape of the transition edge at this point of the final product, and outwardly protruding shaping wrinkle suction ribs are provided at segment three near the right-angle corner, and the shaping wrinkle suction ribs are in an arc shape along the edge of the right-angle corner, and the corresponding shaping lower mold is provided with a shaping wrinkle suction groove at the matching position of the shaping wrinkle suction ribs.

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