Die

Abstract

The invention provides a mold for improving adhesion of a release agent to a deep part of the mold. The mold (200) is configured from a male mold (20) and a female mold (30) and is used for manufacturing a vehicle body structural member including a wheel arch, and fine irregularities are provided in a deep portion (31A) of the inner surface of the female mold (30).

Description

Technical Field

[0001] This disclosure relates to the structure of molds for manufacturing vehicle body structural components, including wheel arches. Background Technology

[0002] In recent years, vehicle body structural components have been manufactured using casting. Patent Document 1 discloses a mold for manufacturing suspension towers, which are vehicle body structural components. The mold described in Patent Document 1 consists of a concave fixed mold and a convex movable mold.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-202442 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in recent years, large body structure components have been manufactured using casting. When manufacturing body structure components by casting, a release agent is sprayed onto the surface of the mold to ensure smooth demolding. However, the molds used in the manufacture of large body structure components have considerable depth, so a long spray nozzle is used to spray the release agent to ensure it adheres sufficiently to the deeper parts of the mold.

[0008] However, the long spray nozzles become complicated to install in order to avoid interference with the mold, and sometimes the casting cycle time becomes longer.

[0009] Therefore, the purpose of this disclosure is to improve the adhesion of the release agent to the deep parts of the mold.

[0010] Methods for solving problems

[0011] The mold disclosed herein consists of a male mold and a female mold, and is used to manufacture vehicle body structural components including wheel arches. The mold is characterized in that fine irregularities are provided at a deep part of the inner surface of the female mold.

[0012] Invention Effects

[0013] This disclosure can improve the adhesion of the release agent to the deep parts of the mold. Attached Figure Description

[0014] Figure 1 It is a three-dimensional view of the vehicle, including the rear frame.

[0015] Figure 2 It means manufacturing Figure 1 The three-dimensional view of the mold for the rear frame shown is a three-dimensional view representing the state in which the male mold and female mold are combined in the vertical direction.

[0016] Figure 3 This is a side sectional view of the mold in its erected state and placed on the casting apparatus. Figure 2 The AA section shown.

[0017] Figure 4 This is a top sectional view of the mold in its erected state within the casting apparatus. Figure 2 The BB cross section shown.

[0018] Figure 5 yes Figure 3 The detailed diagram of section C is shown.

[0019] Explanation of reference numerals in the attached figures

[0020] 10 Rear frame, 10A cavity, 11 wheel arch, 11A wheel arch cavity, 12 rear crossbeam, 12A rear crossbeam cavity, 13 rear floor, 13A rear floor cavity, 20 male mold, 21 protrusion, 22, 25 flat surface, 23, 24, 33, 34 mating surface, 30 female mold, 31 groove, 31A deep part, 31B groove, 32, 35 recess, 38 concave and convex parts, 50 spray device, 51 robotic arm, 52 spray nozzle, 100 vehicle, 200 mold. Detailed Implementation

[0021] Hereinafter, the mold 200 of the embodiment will be described with reference to the accompanying drawings (see attached drawings). Figures 2-5 This will be explained in more detail. First, refer to... Figure 1 The vehicle 100 equipped with a rear frame 10 manufactured using mold 200 will be described. Additionally, Figure 1 The markings FR, UP, and LH recorded in the document indicate the front, upper, and left sides of vehicle 100.

[0022] The rear frame 10 is a lower body structure component constituting the rear of the vehicle 100, including left and right wheel arches 11, a rear crossbeam 12, and a rear floor 13. The rear frame 10 is a cast aluminum product, and the left and right wheel arches 11, rear crossbeam 12, and rear floor 13 are integrally formed. The left and right wheel arches 11 are arched sections that internally house the rear wheels. The rear crossbeam 12 is a channel-shaped section connecting the left and right wheel arches 11 in the vehicle width direction. The rear floor 13 is a plate-like section constituting the floor behind the rear seats of the vehicle 100.

[0023] like Figure 2 As shown, the mold 200 used for casting the rear frame 10 consists of a male mold 20 and a female mold 30. Figure 2As shown, if the male mold 20 and the female mold 30 are combined, a cavity 10A is formed in the middle for the inflow of molten metal. The cavity 10A includes a wheel arch cavity 11A forming the wheel arch 11, a rear crossbeam cavity 12A forming the rear crossbeam 12, and a rear floor cavity 13A forming the rear floor 13. Figure 2 As shown, one side of the female mold 30 is in front of the mold 200 (hereinafter referred to as the mold front), one side of the male mold 20 is behind the mold 200 (hereinafter referred to as the mold rear), and the vehicle-front side of the rear frame 10 is above the mold 200 (hereinafter referred to as the mold top). In addition, the left side facing the front of the mold 200 is the mold left.

[0024] like Figure 3 As shown, mold 200 is erected by a crane (not shown) with the mold facing upward in the direction of gravity and is placed on the casting apparatus (not shown). Figure 3 This is a side sectional view of the mold 200 in its erected state and placed in the casting apparatus. Figure 2 The AA section shown.

[0025] The female mold 30, located in front of the mold, is mounted on the fixed plate of the casting apparatus. The male mold 20, located behind the mold, is mounted on the movable plate of the casting apparatus. By moving the movable plate of the casting apparatus in the direction in front of and behind the mold, the male mold 20 and the female mold 30 can be closed and opened. Figure 3 The solid line in the diagram indicates the state where the male mold 20 moves rearward, opening both the male mold 20 and the female mold 30. Additionally, Figure 3 The dashed line in the diagram represents the state in which the male mold 20 moves forward towards the mold die, thus closing the male mold 20 and the female mold 30. Additionally, Figure 4 This is a top sectional view of the mold 200 in its erected state and placed in the casting apparatus. Figure 2 The BB cross section shown. Figure 4 The solid lines in the diagram represent the open shape of the male mold 20 and the female mold 30, while the dashed lines represent the closed state of the male mold 20 and the female mold 30.

[0026] like Figure 3 , Figure 4 As shown, the male mold 20 has a semi-circular protrusion 21, flat surfaces 22 and 25, and mating surfaces 23, 24, 26, and 27 on the top, bottom, left, and right sides. The female mold 30 has a semi-circular groove 31, flat recesses 32 and 35, and mating surfaces 33, 34, 36, and 37 on the top, bottom, left, and right sides.

[0027] like Figure 3 , Figure 4As shown by the dotted lines, when the male mold 20 is moved forward in the mold direction, causing the mating surfaces 23, 24, 26, and 27 of the male mold 20 to mate with the mating surfaces 33, 34, 36, and 37 of the female mold 30, the protrusion 21 and the groove 31 form the wheel arch cavity 11A. Furthermore, the flat portion 22 and the recessed portion 32 constitute the rear floor cavity 13A. Additionally, the flat portion 25 and the recessed portion 35 constitute the rear crossbeam cavity 12A.

[0028] A spraying device 50 is provided in the casting apparatus. This spraying device 50 includes a spray nozzle 52 for spraying a release agent onto the surface of the female mold 30 and a robotic arm 51 for adjusting the position of the spray nozzle 52. In the case of casting, such as… Figure 3 , Figure 4 As shown, the spray nozzle 52 is inserted between the male mold 20 and the female mold 30 by the robotic arm 51, and the release agent is sprayed toward the inner surface of the groove 31.

[0029] Here, as Figure 5 As shown, fine irregularities 38 are provided on the inner surface of the deep portion 31A, which is the deep part of the groove 31 of the female mold 30. Figure 5 As shown, the concave and convex shapes 38 can also be configured as linear, wavy, intersecting, or grid-like arrangements of grooves 31B. In this case, the depth H of the grooves 31B can be 100 μm to 50 μm, the width W of the grooves 31B can be the same as the depth H, and the spacing P of the grooves 31B can be approximately twice the depth H. For example, when the depth H of the grooves 31B is set to 100 μm, the spacing P can be set to 200 μm; when the depth H of the grooves 31B is set to 50 μm, the spacing P can be set to 100 μm.

[0030] Alternatively, the unevenness 38 can also be a rough surface formed by sandblasting, for example, by spraying metal particles or sand particles. In this case, the inner surface of the groove 31 can be covered with a mask or the like, so that only the depth 31A becomes a rough surface.

[0031] Alternatively, the groove 31B described above can also be formed by laser-based surface processing.

[0032] In the mold 200 of the embodiment, the adhesion of the release agent to the inner surface of the deep portion 31A of the groove 31 of the female mold 30 is enhanced by the fine irregularities 38. Therefore, even when the release agent is distributed through a spray nozzle 52 of normal length, sufficient release agent can adhere to the inner surface of the deep portion 31A. Consequently, the arrangement of the spray nozzle 52 is simplified, and the casting cycle time can be shortened.

[0033] Furthermore, the above description describes the case where the concave and convex 38 are provided in the depth 31A of the groove 31 of the female mold 30, but it is not limited to this. For example, the concave and convex 38 may also be provided on the inner side of the groove 31.

[0034] Alternatively, the spray nozzle 52 can also be a spray nozzle with a narrower spray angle and a longer spray distance than a typical spray nozzle.

Claims

1. A mold, comprising a male mold and a female mold, for manufacturing vehicle body structural components including wheel arches, characterized in that, The inner surface of the female mold has fine irregularities at a deep part.

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