Mold structure

Abstract

To provide a die structure which enables reduction of damage of a main die.SOLUTION: A die structure 100 according to the disclosure has a nested element 30 and a main die 10 and includes a plate 20 between the nested element 30 and the main die 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a mold structure. [Background technology]

[0002] In the field of die casting, techniques related to a punching mechanism for forming a punched portion in a molded product are known. For example, Patent Document 1 discloses a mold including a core insert having a cavity surface, an inner main mold disposed on the back side of the core insert, and an outer main mold having a through-hole that houses the inner main mold. In the technique disclosed in Patent Document 1, a punching mechanism is provided on a fixed platen that includes a fixed mold, and the punching mechanism includes a punch pin that penetrates the fixed mold from the back side and protrudes into the cavity. In addition, the core insert and a back block of the fixed mold are formed with punching holes through which the punch pin passes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-125815 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have found the following problems. The mold disclosed in Patent Document 1 is configured so that the tip of the core pin comes into contact with the master mold. Therefore, when casting is performed using such a mold, if pressing forces are concentrated on the tip of the core pin due to the casting pressure or mold clamping force, the master mold may be damaged in the portion that contacts the tip of the core pin. Furthermore, repeated damage may increase the frequency of welding repairs in that portion, which may shorten the life of the master mold.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a mold structure that can reduce damage to the main mold. [Means for solving the problem]

[0006] The mold structure according to the present disclosure comprises: A mold structure having an insert and a main mold, A plate is provided between the insert and the main mold. [Effects of the Invention]

[0007] The present disclosure makes it possible to provide a mold structure that can reduce damage to the main mold. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view showing a mold structure according to the embodiment. [Figure 2] FIG. 1 is a perspective view showing a mold structure according to an embodiment. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2 and a partially enlarged view. [Figure 4] FIG. 1 is a cross-sectional view showing an example of a mold structure having a cast-out mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals. For clarity of explanation, duplicated explanations will be omitted as necessary.

[0010] First, the problem to be solved by the present disclosure will be described with reference to Fig. 4. Note that the contents overlapping with the configuration of the mold structure 100 according to the present embodiment, which will be described later, will be explained in an appropriately simplified manner. Fig. 4 is a cross-sectional view showing an example of a mold structure having a cast-out mechanism. The mold structure 101 shown in the figure is a mold structure that is applied to, for example, a fixed mold or a movable mold in die casting.

[0011] The right-handed XYZ coordinate system shown in FIG. 4 and other drawings is for the convenience of explaining the positional relationship of the components. Typically, the positive Z-axis direction is vertically upward, and the XY plane is a horizontal plane, which is common to all drawings. Also, while FIG. 4 shows only one of the fixed mold and the movable mold, the other mold may have a similar configuration. The fixed mold and the movable mold are arranged to face each other, and the movable mold is configured to be able to move toward and away from the fixed mold. For example, if the mold structure 101 shown in the same figure is applied to the movable mold, the movable mold will move in the negative Y-axis direction and approach the fixed mold during mold clamping.

[0012] The mold structure 101 includes a main mold 10, a core insert 30, a core pin 40, and a fall prevention structure 50. The core insert 30 is a component that forms a cavity between itself and a mating mold when the molds are clamped. The cavity is a hollow portion into which a molten molding material (e.g., molten aluminum) is injected. The main mold 10 has a recess (not shown in FIG. 4) for fitting the core insert 30, and the core insert 30 is provided in the main mold 10 so as to fit into the recess. The surface of the main mold 10 that comes into contact with the core insert 30 is referred to as the main mold surface 11. The surface of the core insert 30 on the opposite side to the main mold 10 (the negative Y-axis direction side) is referred to as the core insert surface 31. The core insert surface 31 forms a cavity between itself and the core insert surface of the mating mold.

[0013] The core pin 40 is a member for forming a core portion in the molded product, and is provided so as to penetrate the core insert 30. The core pin 40 has a main body 40a and a flange 40b provided at one end of the main body 40a. The end face of the flange 40b abuts against the main mold surface 11. The flange 40b is provided with a fall prevention structure 50 for preventing the core pin 40 from falling from the core insert 30. The fall prevention structure 50 is composed of, for example, a fall prevention plate or bolts, and prevents the core pin 40 from falling by fixing the flange 40b to the core insert 30.

[0014] During casting, first, the fixed mold and the movable mold are clamped to bring them close to each other, forming a cavity between them. Next, molten metal is poured into the formed cavity and cooled to below its solidification temperature. This causes the molten metal to solidify, forming a casting. After the casting is formed, the fixed mold and the movable mold are opened, and the casting is removed.

[0015] In the above-described casting process, casting pressure is applied to the core pin 40, as indicated by the white arrows in the figure. Here, the main mold 10 may be formed from a material that is softer (less hard) than the material of the core pin 40, for reasons such as cost reduction. This may result in a concentrated pressure from the flange 40b to the main mold 10, which may cause buckling at the contact portion 11a between the flange 40b and the main mold surface 11. If buckling occurs, the contact portion 11a may need to be repaired by welding. Furthermore, repeated casting may cause accumulated damage to the main mold surface 11, which may lead to an increase in the frequency of repairs. This may shorten the life of the main mold 10.

[0016] Furthermore, as described above, in the mold structure 101, it is necessary to provide the core pin 40 with a fall prevention structure 50 to prevent the core pin 40 from falling out of the core core 30. Furthermore, it is necessary to provide such a fall prevention structure 50 not only for the core pin 40 but also for other components, such as ejector pins used in the ejection mechanism. It is expected that a plurality of such components will be provided in the core core 30, and a fall prevention structure 50 must be provided individually for each component. This results in a problem of a complicated fall prevention configuration, which reduces the ease of disassembly when disassembling the core core 30.

[0017] Next, the mold structure according to the present disclosure will be described. 1 is a cross-sectional view showing a mold structure 100 according to this embodiment. Description of parts that overlap with the mold structure 101 described above will be omitted where appropriate.

[0018] The mold structure 100 can be applied to a mold structure having an insert and a master mold. In the following, an example will be described in which the mold structure 100 is applied to a fixed mold or a movable mold used in die casting, similar to the mold structure 101. As shown in the figure, the mold structure 100 includes a master mold 10, an insert 30, a core pin 40, and a plate 20.

[0019] The main mold 10 is a member into which the plate 20 and the insert 30 are fitted. The main mold 10 has a recess (not shown in FIG. 1 ) into which the plate 20 and the insert 30 are fitted. The main mold 10 fits the insert 30 in the recess so as to sandwich the plate 20 therebetween. The surface of the main mold 10 that comes into contact with the plate 20 is referred to as the main mold surface 11. The main mold 10 may be formed using a material that is softer (has lower hardness) than the plate 20, the insert 30, and the core pin 40. The material of the main mold 10 is, for example, cast steel.

[0020] The insert 30 is a member that forms a cavity between itself and a mating mold when the molds are clamped. The insert 30 is provided so as to fit into a recess in the main mold 10 with the plate 20 sandwiched therebetween. The surface of the insert 30 on the opposite side (the Y-axis negative direction side) from the main mold 10 and the plate 20 is the insert surface 31. The insert surface 31 forms a cavity between itself and the insert surface of the mating mold.

[0021] The core 30 is provided with a core pin hole 32 for inserting the core pin 40. The core pin hole 32 is formed to penetrate the core 30 in the thickness direction (Y-axis direction). The insert 30 is formed using a material that is harder (has a higher hardness) than the material of the main mold 10. The material of the insert 30 is, for example, SKD material.

[0022] The core pin 40 is a component for forming a core portion in a molded product. The core pin 40 is a long shaft member extending in the Y-axis direction along its axis and is provided so as to pass through the core pin hole 32. The core pin 40 includes a main body 40a and a flange 40b provided at one end of the main body 40a. The main body 40a is composed of, for example, a cylindrical shaft portion with a circular cross section and a protruding portion that protrudes into the cavity. The end face of the flange 40b on the positive Y-axis side abuts against the plate 20. Therefore, when casting pressure is applied to the core pin 40, the flange 40b directly presses against the plate 20. This prevents the flange 40b from directly pressing against the main mold 10.

[0023] The core pin 40 is formed, for example, using a material that is harder than the material of the main mold 10. The material of the core pin 40 is, for example, SKD material. Note that in this embodiment, the core pin 40 is described as an example of a part provided in the insert 30, but this is not limiting. For example, ejector pins used in an ejection mechanism for ejecting a molded product from a mold, flanges of bushings, flanges on the backside of split inserts, insert assembly parts, and other members can also be considered to be similar to the core pin 40.

[0024] The plate 20 is a member provided between the insert 30 and the main mold 10. The plate 20 may be, for example, a single plate-like member made of a metal material. The material and other details will be described later.

[0025] 1 , the plate 20 abuts against the back surface of the insert 30 and the end face of the flange portion 40b on the negative side of the Y-axis, and against the main mold surface 11 on the positive side of the Y-axis. The plate 20 has an area approximately the same as that of the end face of the insert 30 on the main mold 10 side, for example, so that the insert 30 and the main mold surface 11 do not come into contact with each other. However, the area of ​​the plate 20 may be smaller or larger than that of the end face of the insert 30 depending on the position of the core pin 40 provided in the insert 30, etc.

[0026] In this way, by providing the plate 20 between the insert 30 and the main mold 10, as shown by the white arrow in the figure, the plate 20 can distribute the surface pressure from the insert 30 to the main mold 10. This reduces the local surface pressure applied to the main mold 10, suppressing damage to the main mold 10 (sagging due to casting pressure and mold clamping force), leading to a reduction in the frequency of welding repairs for the main mold 10 and an extension of its lifespan.

[0027] The plate 20 is formed using a material that is equal to or less hard than the material of the insert 30, but is harder than the material of the main mold 10. In other words, the plate 20 is made of a material that is equal to or less hard than the material of the insert 30, but harder than the material of the main mold 10. The material of the plate 20 is, for example, SKD material.

[0028] Furthermore, the plate 20 is not divided into pieces but is constructed as a single piece. By constructing the plate 20 as a single piece, it is possible to ensure the plate thickness accuracy and maintain the accuracy of assembling the insert 30 to the main mold 10. This makes it possible to suppress the generation of unnecessary stress (for example, application of mold clamping force in an inclined state), thereby preventing the insert's lifespan from being shortened.

[0029] Furthermore, by constructing the plate 20 from a single plate in this way, it is not necessary to provide a separate fall prevention structure 50 for each core pin 40, etc. This eliminates the need for separate fall prevention structures 50 and makes it possible to have the fall prevention structures 50 act integrally on the parts, etc., provided on the insert 30, thereby improving the ease of disassembly and assembly of the insert 30.

[0030] Next, the arrangement of the plate 20 will be described with reference to Figures 2 and 3. Figure 2 is a perspective view showing a mold structure 100 according to this embodiment. Figure 3 is a cross-sectional view taken along line AA and a partially enlarged view of the mold structure 100 shown in Figure 2. The right-handed XYZ coordinate system in Figures 2 and 3 corresponds to that in Figure 1. The X-axis direction indicates the width direction of the main mold 10, the plate 20, and the insert 30. The Y-axis direction indicates the thickness direction of these, and the Z-axis direction indicates the vertical direction. Note that the core pin 40 is not shown in Figures 2 and 3.

[0031] 2, the mold structure 100 has, from the positive Y-axis direction side (the right side of the figure) to the negative Y-axis direction side (the left side of the figure), a main mold 10, a plate 20, and a insert 30, in that order. The main mold 10 is provided with a recess 15 for fitting the insert 30. As shown in the figure, the mold structure 100 can be constructed by fitting the insert 30 into the recess 15 with the plate 20 sandwiched between them.

[0032] During casting, casting pressure is applied to a core pin 40 (see FIG. 1) provided on the insert 30 from the negative side of the Y-axis toward the positive side of the Y-axis. In the mold structure 101 described with reference to FIG. 4, the insert 30 is fitted directly into the recess 15 without the plate 20 therebetween, so that the core pin 40 and the main mold 10 come into localized contact. On the other hand, in the mold structure 100 according to this embodiment, the plate 20 is provided between the insert 30 and the main mold 10, so that the plate 20 distributes the surface pressure applied to the main mold 10, thereby preventing localized contact between the core pin 40 and the main mold 10.

[0033] 3 shows a cross-sectional view taken along line AA in FIG. 2 and a partially enlarged view thereof. As in FIG. 2, a plate 20 is provided between the insert 30 and the main mold 10. In FIG. 3 as well, a casting pressure is applied from the negative Y-axis direction (upper side of the figure) to the positive Y-axis direction (lower side of the figure), but the plate 20 distributes the surface pressure on the main mold 10, thereby reducing damage to the main mold 10. As shown in the partially enlarged view of FIG. 3, the plate 20 may be configured to have an area large enough to cover the contact area between the plate 20 and the main mold 10 so that the insert 30 and the main mold 10 do not come into contact with each other.

[0034] As described above, the mold structure 100 according to this embodiment includes the insert 30 and the main mold 10, and the plate 20 is provided between the insert 30 and the main mold 10. With this configuration, there is no local contact between the main mold 10 and members such as the core pin 40 provided on the insert 30, and the plate 20 can distribute and relieve the surface pressure on the main mold 10. This makes it possible to prevent buckling from occurring on the surface of the main mold 10, thereby reducing damage to the main mold 10.

[0035] Furthermore, by providing the plate 20 on the back side (main mold 10 side) of the insert 30, the plate 20 can function as a structure for preventing parts from falling when the insert is disassembled. This eliminates the need to provide separate fall prevention structures for the core pins 40, etc., which significantly improves the ease of disassembling and assembling the mold, simplifies the mold configuration, and reduces manufacturing costs.

[0036] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure. [Explanation of symbols]

[0037] 10 Main Type 11 Main mold surface 11a Contact part 15 recess 20 plates 30 nesting 31 Nesting surface 32 Cast pin hole 40 Cast pin 40a Main body 40b flange 50 Fall prevention structure 100 mold structure 101 Mold structure

Claims

1. A mold structure having an insert and a main mold, a plate is provided between the insert and the main mold; The plate is formed using a material having a hardness equal to or less than that of the material of the insert and greater than or equal to that of the material of the main mold. Mold structure.

2. The plate is made of a single plate. The mold structure according to claim 1 .

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