Molding mold

Abstract

The present invention provides a molding die that forms a hole in the ejector pin contact area without requiring any post-molding processing of the product. [Solution] The present disclosure relates to a molding die having a fixed mold, a movable mold 30 that can move toward and away from the fixed mold, and a slide mold 54 that can move relative to the movable mold 30 in a direction perpendicular to the direction of movement of the movable mold 30, wherein the slide mold 54 is equipped with an ejector pin 61 that pushes out the product molded in the molding die from the slide mold 54, and a projection 62 is provided at the tip of the ejector pin 61 that protrudes into the cavity CV of the molding die.

Description

Technical Field

[0001] The present disclosure relates to a mold.

Background Art

[0002] Molds are used in die casting of metals, injection molding of resins, etc. Patent Document 1 discloses that a mold having a fixed mold, a movable mold, and a slide mold includes a knockout pin (ejector pin) for pushing out a formed cylindrical frame from the mold.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The portion of the product that the ejector pin abuts is designed to have a wall thickness so that it does not deform due to the pushing of the ejector pin. Utilizing the wall thickness, after the product is molded, a hole is drilled in the portion where the ejector pin abuts, and an engaging portion of a bundling member for bundling a harness, a hose, etc. is inserted and fixed in the hole. Although there is such a method of utilizing the portion where the ejector pin abuts, hole drilling is required after the product is molded. The present disclosure solves such problems and provides a mold that forms a hole in the portion where the ejector pin abuts without machining after the product is molded.

Means for Solving the Problems

[0005] This disclosure relates to a molding die having a fixed mold, a movable mold that can move toward and away from the fixed mold, and a sliding mold that can move relative to the movable mold in a direction perpendicular to the direction of movement of the movable mold, wherein the sliding mold is provided with an ejector pin that pushes out a product molded in the molding die from the sliding mold, and the tip of the ejector pin is provided with a projection that protrudes into the cavity of the molding die. This configuration allows holes to be formed in the ejector pin contact area without any post-molding processing of the product.

[0006] The ejector pin can move relative to the movable mold in a direction perpendicular to the direction of movement of the movable mold, and the movable mold has a retaining portion that prevents the product from moving together with the ejector pin when the product is molded in the molding die and the ejector pin is moved. With this configuration, the projection of the ejector pin can be separated from the product. [Effects of the Invention]

[0007] This disclosure provides a molding die that forms a hole in the ejector pin contact portion of the product without requiring post-molding. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view of the molding die according to the embodiment. [Figure 2] Figure 1 is a schematic perspective view of the three-dimensional area enclosed by the dashed line when the molding die is closed. [Figure 3] Figure 1 is a partial cross-sectional view in the planar direction of the molding die in the closed state. [Figure 4] This is a partial cross-sectional view of the two-dimensional area indicated by the dashed line in Figure 2, viewed from direction IV. [Figure 5] The dashed line in Figure 2 shows a partial cross-sectional view of the two-dimensional area as seen from direction IV, illustrating the state in which the die-cast product has been formed. [Figure 6]The dashed line in Figure 2 shows a partial cross-sectional view of the two-dimensional area as seen from direction IV, illustrating the state in which the sliding mechanism is retracted. [Figure 7] The dashed line in Figure 2 shows a partial cross-sectional view of the two-dimensional area as seen from direction IV, illustrating the state in which the sliding mechanism has been further retracted. [Figure 8] The dashed line in Figure 2 shows a partial cross-sectional view of the two-dimensional area as seen from direction IV, illustrating the state after the die-cast product has been removed and the slide mold has been advanced. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to Figures 1 to 8. Figure 1 is a schematic perspective view of a molding die according to an embodiment. Figure 2 is a schematic perspective view of the three-dimensional area enclosed by the dashed line when the molding die shown in Figure 1 is closed. Figure 3 is a partial cross-sectional view in the planar direction when the molding die shown in Figure 1 is closed. Figure 4 is a partial cross-sectional view of the two-dimensional area shown by the dashed line in Figure 2, viewed from direction IV. Figure 5 is a partial cross-sectional view of the two-dimensional area shown by the dashed line in Figure 2, viewed from direction IV, showing the state in which the die-cast product has been molded. Figure 6 is a partial cross-sectional view of the two-dimensional area shown by the dashed line in Figure 2, viewed from direction IV, showing the state in which the slide die has been retracted. Figure 7 is a partial cross-sectional view of the two-dimensional area shown by the dashed line in Figure 2, viewed from direction IV, showing the state in which the slide die has been further retracted. Figure 8 is a partial cross-sectional view of the two-dimensional area shown by the dashed line in Figure 2, viewed from direction IV, showing the state in which the slide die has been advanced after the die-cast product has been removed.

[0010] It should be noted that the right-handed XYZ Cartesian coordinate system shown in Figures 1 to 8 is merely a convenient representation for explaining the positional relationships of the constituent elements. In Figures 1 to 8, the positive Z-axis corresponds to the upward direction, and the XY plane corresponds to the horizontal plane. The positive X-axis corresponds to the right direction, and the negative X-axis corresponds to the left direction. The positive Y-axis corresponds to the forward direction, and the negative Y-axis corresponds to the backward direction.

[0011] The molding die 10 shown in Figure 1 is a mold for forming die-cast products by the die-casting method. The molding die 10 has a fixed mold 20, a movable mold 30, and four sliding molds 51, 52, 53, and 54. The fixed mold 20, the movable mold 30, and the sliding molds 51, 52, 53, and 54 are made of a metal material such as hot work tool steel, and a cavity CV is formed in the space surrounded by these molds. Note that in Figure 1, the three-dimensional area enclosed by the dashed line is not shown, and this area is shown in Figure 2.

[0012] As shown in Figures 1 to 3, the fixed mold 20 has a base 21, a first protrusion 22, and a second protrusion 23. The base 21 has a roughly rectangular parallelepiped shape. As shown in Figure 3, the first protrusion 22 is formed on the side 21a of the base 21 facing the movable mold 30. The first protrusion 22 is formed by a flat plate-shaped projection that extends from the base 21 toward the movable mold 30. The second protrusion 23 is formed on the side of the first protrusion 22 facing the movable mold 30. The second protrusion 23 is formed by a rectangular parallelepiped-shaped projection that extends from the first protrusion 22 toward the movable mold 30. The second protrusion 23 is formed in the center of the first protrusion 22 in the front-rear direction (Y-axis direction in Figure 3). In other words, the first protrusion 22 and the second protrusion 23 form a projection structure consisting of two stages of protrusions. The side surface 21a, the first protrusion 22, and the second protrusion 23 constitute a part of the periphery of the cavity CV. The fixed mold 20 is provided with a sprue (not shown) for injecting molten metal into the cavity CV.

[0013] As shown in Figures 1 to 3, the movable mold 30 is positioned facing the fixed mold 20. The movable mold 30 can move in the left-right direction (X-axis direction in Figure 1) to move closer to and further away from the fixed mold 20 by a driving means (not shown). The movement of the movable mold 30 causes the molding die 10 to open and close.

[0014] The movable mold 30 has a base 31, a first protrusion 32, and a second protrusion 33. The base 31 has a substantially rectangular parallelepiped shape. As shown in Figure 3, the first protrusion 32 is formed on the side 31a of the base 31 facing the fixed mold 20. The first protrusion 32 is formed by a flat plate-shaped projection that extends from the base 31 toward the fixed mold 20. The second protrusion 33 is formed on the side of the first protrusion 32 facing the fixed mold 20. The second protrusion 33 is formed by a rectangular parallelepiped-shaped projection that extends from the first protrusion 32 toward the fixed mold 20. The second protrusion 33 is formed in the center of the first protrusion 32 in the front-rear direction (Y-axis direction in Figure 3). In other words, the first protrusion 32 and the second protrusion 33 form a projection structure consisting of two stages of protrusions. The side surface 31a, the first protrusion 32, and the second protrusion 33 constitute a part of the periphery of the cavity CV. As shown in Figures 2 and 3, the first protrusion 32 and the second protrusion 33 of the movable type 30 and the first protrusion 22 and the second protrusion 23 of the fixed type 20 have a symmetrical structure with respect to each other in the left-right direction (the X-axis direction in Figure 2).

[0015] As shown in Figures 1 to 3, four slide molds 51, 52, 53, and 54 are positioned between the fixed mold 20 and the movable mold. The slide molds 51, 52, 53, and 54 are positioned approximately the same in the left-right direction (X-axis direction in Figure 1) of the molding die 10. Slide mold 51 is positioned on the upper side of the molding die 10 (positive Z-axis direction in Figure 1), and slide mold 52 is positioned on the lower side of the molding die 10 (negative Z-axis direction in Figure 1). Slide molds 53 and 54 are positioned between slide molds 51 and 52. Slide mold 53 is positioned on the front side of the molding die 10 (positive Y-axis direction in Figure 1), and slide mold 54 is positioned on the rear side of the molding die 10 (negative Y-axis direction in Figure 1). Note that the number of slide molds 51, 52, 53, and 54 is not limited to four, and the number can be other than four as needed.

[0016] The slide types 51, 52, 53, and 54 are fixed to the movable type 30 by fixing means not shown in the figures, and move in the left - right direction (X - axis direction in FIG. 1) of the mold 10 together with the movable type 30. Further, the slide types 51 and 52 can be moved in the up - down direction (Z - axis direction in FIG. 1) of the mold 10 by a hydraulic unit not shown in the figures, and the slide types 53 and 54 can be moved in the front - back direction (Y - axis direction in FIG. 1) of the mold 10 by a hydraulic unit not shown in the figures. That is, the slide types 51, 52, 53, and 54 can move in a direction (Y - axis direction and Z - axis direction in FIG. 1) orthogonal to the moving direction (X - axis direction in FIG. 1) of the movable type 30 with respect to the movable type 30.

[0017] As shown in FIG. 1, the slide types 51 and 52 are substantially rectangular parallelepiped in shape. On the slide type 51, a side surface 51a, which is the surface facing the slide type 52, is formed, and on the slide type 52, a side surface 52a, which is the surface facing the slide type 51, is formed (only the side surface 52a is shown in FIG. 1). The side surface 51a and the side surface 52a constitute a part of the periphery of the cavity CV.

[0018] As shown in FIGS. 2 and 3, the slide type 53 has a base portion 53a and a convex portion 53c (the base portion 53a is shown by a broken line in FIG. 2). The base portion 53a is substantially rectangular parallelepiped in shape. As shown in FIG. 3, a convex portion 53c is formed on the side surface 53b of the base portion 53a facing the slide type 54. The convex portion 53c is formed by a flat - plate - like protrusion protruding from the base portion 53a toward the slide type 54. The convex portion 53c is formed at the center in the left - right direction (X - axis direction in FIG. 3) of the base portion 53a. The side surface 53b and the convex portion 53c constitute a part of the periphery of the cavity CV.

[0019] As shown in FIGS. 2 and 3, the slide type 54 has a base portion 54a and a convex portion 54c (the base portion 54a is shown by a broken line in FIG. 2). The base portion 54a is substantially rectangular parallelepiped in shape. As shown in FIG. 3, a convex portion 54c is formed on the side surface 54b of the base portion 54a facing the slide type 53. The convex portion 54c is formed by a flat - plate - like protrusion protruding from the base portion 54a toward the slide type 53. The convex portion 54c is formed at the center in the left - right direction (X - axis direction in FIG. 3) of the base portion 54a. The side surface 54b and the convex portion 54c constitute a part of the periphery of the cavity CV.

[0020] As shown in FIGS. 2 and 3, the convex portion 53c of the slide type 53 is disposed outside the front direction (positive Y-axis direction in FIG. 2) of the second convex portion 23 of the fixed type 20 and outside the front direction (positive Y-axis direction in FIG. 2) of the second convex portion 33 of the movable type 30. The convex portion 54c of the slide type 54 is disposed outside the rear direction (negative Y-axis direction in FIG. 2) of the second convex portion 23 of the fixed type 20 and outside the rear direction (negative Y-axis direction in FIG. 2) of the second convex portion 33 of the movable type 30. The convex portion 53c of the slide type 53 and the convex portion 54c of the slide type 54 form a symmetric structure in the front-rear direction (Y-axis direction in FIG. 2).

[0021] As shown in FIG. 4, an extrusion device 60 for extruding the formed die-cast product from the slide type 54 is provided inside the slide type 54. The extrusion device 60 includes an ejector pin 61, a manifold plate 63, a forward projection 64, a retraction projection 65, a spring 66, and a positioning mechanism 67.

[0022] The ejector pin 61 is formed of a metal rod member and extends in the front-rear direction (Y-axis direction in FIG. 4) of the slide type 54. The end portion of the ejector pin 61 on the cavity CV side is inserted into a through hole formed in the convex portion 54c of the slide type 54, and its tip faces the cavity CV and constitutes a part of the periphery of the cavity CV. A plurality of ejector pins 61 are arranged in the vertical direction (Z-axis direction in FIG. 4) of the slide type 54 to extrude the formed die-cast product from the slide type 54.

[0023] A projection 62 is formed at the tip of the ejector pin 61 on the cavity CV side at the uppermost part of the slide type 54. The projection 62 is constituted by a substantially columnar projection protruding from the tip of the ejector pin 61 toward the cavity CV. The tip of the projection 62 is formed in a spherical shape. The projection 62 can be formed in various shapes such as a prismatic shape. The ejector pin 61 below the uppermost part of the slide type 54 has a tip on the cavity CV side formed in a planar shape.

[0024] The manifold plate 63 is flat and extends in the vertical direction (Z-axis direction in Figure 4) of the slide mold 54. The ends of multiple ejector pins 61 opposite to the cavity CV are connected to the manifold plate 63. The manifold plate 63 can move relative to the slide mold 54 in the front-rear direction (Y-axis direction in Figure 4), and the movement of the manifold plate 63 causes the multiple ejector pins 61 to move axially (Y-axis direction in Figure 4). That is, the ejector pins 61 move relative to the movable mold 30 in a direction perpendicular to the direction of movement of the movable mold 30 (X-axis direction in Figure 4) (Y-axis direction in Figure 4).

[0025] The forward projection 64 and the backward projection 65 are provided on the upper and lower parts of the slide mold 54, respectively. The forward projection 64 and the backward projection 65 are formed by rectangular parallelepiped-shaped protrusions that project inward from the outer frame of the base 54a of the slide mold 54. The forward projection 64 and the backward projection 65 are arranged side by side in the front-to-back direction of the slide mold 54 (Y-axis direction in Figure 4), with the forward projection 64 positioned on the side away from the cavity CV relative to the backward projection 65. The forward projection 64 and the backward projection 65 move the assembly plate 63, which is positioned between them, in the front-to-back direction of the slide mold 54 (Y-axis direction in Figure 4).

[0026] The spring 66 is positioned on the side of the manifold plate 63 opposite to the cavity CV. The spring 66 expands and contracts in the front-to-back direction of the sliding type 54 (Y-axis direction in Figure 4), biasing the manifold plate 63 toward the cavity CV.

[0027] The positioning mechanism 67 is formed from a metal rod-shaped member and extends in the front-rear direction (Y-axis direction in Figure 4) of the slide mold 54. The positioning mechanism 67 is inserted through a through hole formed in the manifold plate 63, and the movement of the manifold plate 63 is restricted by an enlarged diameter portion 67a formed at the end on the cavity CV side, thereby positioning the ejector pin 61. Although not shown, similar extrusion devices 60 are also arranged in the slide molds 51, 52, and 53.

[0028] Next, the function of the extrusion apparatus 60 will be explained using Figures 2 to 8. Only the extrusion apparatus 60 located in slide mold 54 will be explained, and the explanations of the extrusion apparatus 60 located in slide molds 51, 52, and 53 will be omitted.

[0029] First, as shown in Figure 4, the slide mold 54 is moved toward the second protrusion 33 of the movable mold 30 by a hydraulic unit (not shown). Simultaneously, the slide molds 51, 52, and 53 are also moved toward the second protrusion 33 of the movable mold 30. Next, the movable mold 30 and the slide molds 51, 52, 53, and 54 are moved toward the fixed mold 20 to close the mold. A cavity CV is formed between the fixed mold 20, the movable mold 30, and the slide molds 51, 52, 53, and 54.

[0030] Next, molten metal is poured into the cavity CV from a sprue (not shown) formed in the fixed mold 20, and the cavity CV is filled with molten metal. After filling, as shown in Figure 5, the molten metal solidifies and the die-cast product W is formed. A hole W1 is formed in the die-cast product W by the projection 62 of the ejector pin 61, penetrating in the thickness direction.

[0031] Next, the movable mold 30 and the slide molds 51, 52, 53, and 54 are moved away from the fixed mold 20 to open the mold. Then, as shown in Figure 6, the slide mold 54 is moved backward (negative Y-axis direction in Figure 6) by a hydraulic unit (not shown) to retract it relative to the die-cast product W. Even when the slide mold 54 is retracted, the manifold 63 and ejector pins 61 are pushed forward (positive Y-axis direction in Figure 6) by the biasing force of the spring 66 until the retraction projection 65 contacts the manifold 63. With this configuration, the die-cast product W is pushed out of the slide mold 54 by the ejector pins 61.

[0032] Next, as shown in Figure 7, when the slide mold 54 is moved further back relative to the die-cast product W, the manifold 63 engages with the retraction projection 65, and the manifold 63 and ejector pin 61 move in the rearward direction (negative Y-axis direction in Figure 7). As the ejector pin 61 moves, the projection 62 of the ejector pin 61 disengages from the hole W1 of the die-cast product W, and the ejector pin 61 retracts relative to the die-cast product W.

[0033] Here, we will explain why the projection 62 of the ejector pin 61 can detach from the hole W1 of the die-cast product W. Due to the solidification and shrinkage of the molten metal, the hole W1 restrains the projection 62, so the projection 62 cannot detach from the hole W1 unless a force acts to pull them apart. Therefore, when the ejector pin 61 moves backward (negative Y-axis direction in Figure 7) due to the retraction of the slide mold 54, the die-cast product W also tries to move backward (negative Y-axis direction in Figure 7) pulled by the projection 62 of the ejector pin 61. However, as shown in Figure 3, even if a force acts on the die-cast product W to move it backward (negative Y-axis direction in Figure 3), the die-cast product W gets caught on the side surface 32a of the first protrusion 32 of the movable mold 30 facing the slide mold 53, and the side surface 33a of the second protrusion 33 facing the slide mold 53. Therefore, a force acts between the projection 62 of the ejector pin 61 and the hole W1 of the die-cast product W, causing the projection 62 to detach from the hole W1 (the ejector pin 61 and projection 62 are shown by dashed lines in Figure 3).

[0034] Thus, the first protrusion 32 and the second protrusion 33 of the movable mold 30 function as blocking parts that prevent the die-cast product W from moving together with the ejector pin 61 when the die-cast product W is molded in the molding die 10 and the ejector pin 61 is moved. The blocking parts are composed of protrusions that project in a direction perpendicular to the direction of movement of the ejector pin 61 (the Y-axis direction in Figure 3), such as the first protrusion 32 and the second protrusion 33 of the movable mold 30 (the X-axis direction in Figure 3).

[0035] As shown in Figure 7, once the slide mold 54 has retracted to the positioning mechanism 67, the die-cast product W is removed from the molding die 10.

[0036] Next, as shown in Figure 8, the slide type 54 is moved forward (positive Y-axis direction in Figure 8) to advance toward the second protrusion 33 of the movable type 30. As the slide type 54 moves forward, the manifold plate 63 and ejector pin 61 are also biased by the spring 66 and move forward. The manifold plate 63 and ejector pin 61 move forward until the manifold plate 63 contacts the enlarged diameter portion 67a of the positioning mechanism 67.

[0037] Next, when the manifold 63 comes into contact with the enlarged diameter portion 67a of the positioning mechanism 67, only the slide mold 54 moves forward until the forward projection 64 comes into contact with the manifold 63, as shown in Figure 4. In this way, the die-cast product can be molded again in the molding die 10.

[0038] The slide die 54, which constitutes the molding die 10, is equipped with an ejector pin 61 that pushes the die-cast product W formed in the molding die 10 out of the slide die 54, and the tip of the ejector pin 61 is provided with a projection 62 that protrudes into the cavity CV of the molding die 10. The projection 62 of the ejector pin 61 creates a hole W1 in the part of the die-cast product W that the ejector pin 61 contacts. In other words, a hole can be formed in the ejector pin contact area of ​​the die-cast product without processing after molding. The hole allows for the insertion and fixing of the engaging part of a binding member used to bundle harnesses, hoses, etc.

[0039] The first protrusion 32 and the second protrusion 33 of the movable mold 30 function as blocking parts that prevent the die-cast product W from moving together with the ejector pin 61 when the die-cast product W is molded in the molding die 10 and the ejector pin 61 is moved. By providing the blocking parts, a force that pulls them apart acts between the projection 62 of the ejector pin 61 and the hole W1 of the die-cast product W, allowing the projection 62 to detach from the hole W1.

[0040] The molding die described herein can be applied not only to metal die casting but also to low-pressure casting and gravity casting. Furthermore, it can be applied to resin molding, such as injection molding.

[0041] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit. [Explanation of symbols]

[0042] 10. Molding molds 20...Fixed type 30...Movable type 51, 52, 53, 54... slide type 61... Ejector pin 62...Protrusion W... Die-cast products CV...cavity

Claims

1. Fixed type, A movable type that can move toward and away from the fixed type, In a molding die having a sliding mold that can move relative to the movable mold in a direction perpendicular to the direction of movement of the movable mold, The slide mold is equipped with an ejector pin that pushes out the product molded in the molding die from the slide mold. A projection is provided at the tip of the ejector pin that protrudes into the cavity of the molding die. Molding die.

2. The ejector pin can move relative to the movable mold in a direction perpendicular to the direction of movement of the movable mold. The movable mold has a blocking portion that prevents the product from moving together with the ejector pin when the product is molded in the molding die and the ejector pin is moved. The molding die according to claim 1.

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