JP5084904B2 - Mold structure of rectangular parallelepiped products - Google Patents

Description

  The present invention relates to a mold structure of a rectangular parallelepiped product.

  When a rectangular parallelepiped product is molded as an optical component with a mold, as shown in FIG. 10, the movable side mold 104 ′ is placed on the side surface of the cavity 102 of the movable side mold 104 ′ that accommodates the rectangular parallelepiped product 100 in the figure. A draft with an angle γ is applied to the draft direction z1. Regarding the drafting, there is a technique related to a columnar mold apparatus for installing an injection mold (for example, see Patent Document 1). However, when such a draft is applied to the rectangular parallelepiped product side, the angle θ between the lower surface of the rectangular parallelepiped product 100 and the side surface adjacent to the lower surface increases by the draft, and the angle between the two adjacent surfaces. Because of the obtuse angle, the rectangular parallelepiped product is not exactly a rectangular parallelepiped product and may require machining in a later process.

  As another technique, as shown in FIG. 11, in addition to the fixed mold 103 and the movable mold 104, a concave slide plate 105 that slides in the vertical direction between these two molds is provided. After molding the rectangular parallelepiped product 100 ′, there is one in which the slide plate 105 is moved in the upward pulling direction y1.

  In this way, in the conventional mold structure, by adopting a structure in which the slide plate 105 is slid, the product does not cause a defect such as a so-called stress crack, a crack or a galling, and the product is not damaged. It was removed from the mold. Alternatively, in addition to the slide plate, as described above, it was also removed without giving a defect by applying a draft angle.

  However, in the structure using the slide plate, the mold cost and the process increase due to the slide structure. In addition, when the draft is formed, an error occurs in the width of the molded product as described above, and it becomes difficult for the entire surface to intersect at an angle perpendicular to the adjacent surface, and the accuracy of the rectangular parallelepiped product cannot be increased.

JP 2002-337189 A

  This invention solves the above problems, and a rectangular parallelepiped product that can smoothly remove a molded product from a mold without adopting a slide structure attached to the mold or a draft structure formed on the product. An object of the present invention is to provide a mold structure.

The present invention includes a fixed-side mold and a movable-side mold that is movable in a pulling direction that is spaced apart from the fixed-side mold when the mold is opened, and combining the fixed-side mold and the movable-side mold. The part has a mold structure in which a cavity corresponding to a rectangular parallelepiped product and having an internal volume of the rectangular parallelepiped product is formed , and all the three opposing faces in the cavity are inclined with respect to the drawing direction. The configuration.

  According to the present invention, there is provided a mold structure of a rectangular parallelepiped product that can smoothly remove a molded product from the mold without adopting a slide structure attached to the mold or a draft structure formed on the product. Can do.

(A) is a perspective view of the metal mold | die which inclined the joining surface with respect to the vertical direction, (b) is sectional drawing explaining the state in which the inclined surface of a cavity functions as a draft. (A) is a perspective view of the metal mold | die which inclined the joining surface with respect to the horizontal direction, (b) is sectional drawing explaining the state in which the inclined surface of a cavity functions as a draft. It is a perspective view of the metal mold | die which inclined the joining surface with respect to the vertical direction and the horizontal direction. It is the perspective view which changed and showed the direction of the stationary side metal mold | die in FIG. It is sectional drawing at the time of seeing the metal mold | die in FIG. 3 from a horizontal direction. It is sectional drawing at the time of seeing the metal mold | die in FIG. 3 from upper direction. FIG. 6 is a cross-sectional view of a cavity illustrating a substantial draft when a moving side mold of the mold in FIG. 5 is pulled out and a rectangular parallelepiped product is extracted from the mold. It is sectional drawing of the display apparatus to which the rectangular parallelepiped product by the metal mold | die of this invention is applied. It is a fragmentary sectional view of the display apparatus in FIG. It is explanatory drawing of the conventional draft. It is a figure explaining the conventional metal mold | die of a slide structure.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
In FIG. 1 (a), the joint surface 2a, which is the mating part of the fixed mold 2 with its mating mold, has an angle as if it is rotated around the X axis with respect to the XY plane of the orthogonal three-dimensional coordinate axis. α is inclined. The joint surface 3a, which is the mating part of the movable mold 3 with the mating mold, is inclined at an angle α so that the X axis is rotated around the XY plane of the orthogonal three-dimensional coordinate axis. Here, the joining surface 3a is inclined in an inclination direction along the joining surface 2a.

  The joint surface 2a has a convex joint surface 2A protruding from the joint surface 2a uniformly in a Z-shape in the Z direction. The joint surface 3a has a convex joint surface 3A that protrudes uniformly from the joint surface 3a in the Z direction into an L shape. When the joint surfaces 2a, 2A of the fixed mold 2 and the joint surfaces 3a, 3A of the movable mold 3 are joined, the side surface of the convex joint surface 2A protruding in the shape of a letter C and the Z direction A rectangular parallelepiped space surrounded by two joint surfaces 2a and 3a facing each other with a side surface and an interval (corresponding to the thickness of the rectangular parallelepiped product) protruding from the convex joint surface 3A projecting into an L shape. A cavity for forming is formed.

  The rectangular parallelepiped product 4 filled in the cavity is movable as shown in FIG. 1 (a), and as shown in FIG. 1 (b), the pair of opposed surfaces facing each other in the substantially Y-axis direction are movable. The angle α is inclined with respect to the drawing direction z1 of the side mold 3, and the angle α functions as a draft. By tilting the pair of surfaces facing each other in the substantially Y-axis direction, the pair of facing surfaces that inevitably intersect with the punching direction z1 is also tilted with respect to the punching direction z1. Moreover, since a pair of opposing surface which opposes in a substantially Y-axis direction has a relationship orthogonal to an adjacent surface, it has a substantial draft in the state which maintained the characteristic as a rectangular parallelepiped product.

  In the present embodiment, a substantial draft can be formed only on a pair of facing surfaces facing each other substantially in the Y-axis direction among the three pairs of facing surfaces constituting the rectangular parallelepiped product. It can be applied when the required mirror surface accuracy is only this pair of facing surfaces.

Embodiment 2. FIG.
In FIG. 2 (a), the joint surface 20a, which is the mating part of the stationary mold 20 with the counterpart mold, is orthogonal as if the Y-axis is rotated with respect to the XY plane of the orthogonal three-dimensional coordinate axis. The angle β is inclined with respect to the XY plane of the three-dimensional coordinate axis. The joint surface 30a, which is a joint portion of the movable mold 30 with the mating mold, is inclined at an angle β with respect to the XY plane of the orthogonal three-dimensional coordinate axis as rotated about the Y axis. Here, the joint surface 30a is inclined in an inclination direction along the joint surface 20a.

  The joint surface 20a has a convex joint surface 20A protruding from the joint surface 20a uniformly in a Z-shape in the Z direction. The joint surface 30a has a convex joint surface 30A protruding from the joint surface 30a uniformly in an L-shape in the Z direction. When the joint surfaces 20a and 20A of the fixed mold 20 and the joint surfaces 30a and 30A of the movable mold 30 are joined, the side surface of the convex joint surface 20A protruding in the shape of a letter “Z” is formed in the Z direction. A rectangular parallelepiped space surrounded by two joint surfaces 20a, 30a facing each other with a side surface and an interval (corresponding to the thickness of the rectangular parallelepiped product) protruding from the convex joint surface 30A protruding into an L shape. A cavity for forming is formed.

The rectangular parallelepiped product 40 filled in the cavity is taken out as shown in FIG. 2A, and as shown in FIG. 2B, a pair of opposed surfaces (20a, 20a, 30a) is inclined by an angle β with respect to the drawing direction z1 of the movable mold 30, and the angle β functions as a draft. By tilting the pair of surfaces opposed in the substantially X-axis direction with respect to the drawing direction z1, the pair of facing surfaces that inevitably intersect with the drawing direction z1 is also inclined with respect to the drawing direction z1.
Since this pair of opposing surfaces are in a relationship orthogonal to the adjacent surfaces, they have a substantial draft while maintaining the characteristics as a rectangular parallelepiped product.

  In the present embodiment, a substantial draft can be formed only on a pair of facing surfaces facing each other substantially in the X-axis direction among the three pairs of facing surfaces constituting the rectangular parallelepiped product. It can be applied when the required mirror surface accuracy is only this pair of facing surfaces.

Embodiment 3 FIG.
In the first and second embodiments so far, either of the two pairs of facing surfaces excluding the surface facing the drawing direction z1 is positively inclined with respect to the drawing direction to maintain the characteristics as a rectangular parallelepiped product. The embodiment of forming a substantial draft in the state has been described. In the following, the two pairs of opposing surfaces other than the surface facing the punching direction z1 are both inclined with respect to the punching direction, and thus the surface facing the punching direction z1 is necessarily tilted with respect to the punching direction. A substantial draft is formed on all the surfaces while maintaining the characteristics as a rectangular parallelepiped product.

  In FIG. 3, the joint surface 200a, which is the mating part of the fixed mold 200, rotates with the X axis as a fulcrum with respect to the XY plane of the orthogonal three-dimensional coordinate axis, and the Y axis as a fulcrum. By rotating, an inclination is obtained by combining the first and second embodiments. Similarly, with respect to the movable mold 300, the joint surface 300a, which is a mating part with the mating mold, is rotated around the X axis with respect to the XY plane of the orthogonal three-dimensional coordinate axis, and further rotated around the Y axis as a fulcrum. By doing so, an inclination is obtained by combining the first and second embodiments. Here, the bonding surface 300a is inclined in an inclination direction along the bonding surface 200a. FIG. 4 shows the fixed mold 200 rotated so that the joint surface side can be seen well.

  The joint surface 200a has a convex joint surface 200A that protrudes uniformly from the joint surface 200a in the Z-direction. The joint surface 300a has a convex joint surface 300A protruding from the joint surface 300a uniformly in an L shape in the Z direction. When the joint surfaces 200a and 200A of the fixed mold 200 and the joint surfaces 300a and 300A of the movable mold 300 are joined, the side surfaces of the convex joint surface 200A protruding in the shape of the letter “Z” and the Z direction. A rectangular parallelepiped space surrounded by two joint surfaces 200a and 300a facing each other with a side surface and an interval (corresponding to the thickness of the rectangular parallelepiped product) protruding from the convex joint surface 300A protruding into an L shape. A cavity 400C for forming is formed.

  FIG. 5 shows a cross section when the cavity 400C is viewed from the X direction (horizontal), and FIG. 6 shows a cross section when the cavity 400C is viewed from the Y axis direction (top). From these, it can be seen that the joint surfaces 300a, 300A, 200a, and 200A are inclined in the drawing direction z1 with respect to all the X, Y, and Z directions. It can also be seen that the three adjacent surfaces constituting the cavity 400C are formed on the fixed mold 200 and the remaining three surfaces are formed on the movable mold 300, depending on them.

  FIG. 7 shows a cross section viewed from the X-axis direction when the rectangular parallelepiped product 400 is taken out with this mold structure. FIG. 7 is a view seen from the lateral direction, but when viewed from above, drafts are formed in all necessary directions by the draft according to the present invention, so that the smoothness is smooth. The rectangular parallelepiped product 400 can be taken out.

  In the present invention, since the draft that has been conventionally attached to the rectangular parallelepiped product itself is not required, it is possible to mold so that all the surfaces intersect at right angles with the adjacent surfaces. Further, since the slide structure as in the conventional example is eliminated, the number of steps for the slide operation is reduced, and the die cost and the processing time can be reduced.

  In the above embodiment example, a rectangular parallelepiped product has been illustrated, but not limited to this, it can be widely used for forming parts that require a squareness, flatness, mirror surface, etc., and the shape is also a parallelogram, There is no rubbing with a mold such as a cube, and it can be widely used for hexahedrons that require surface accuracy.

  The rectangular parallelepiped product 400 as shown in the embodiment is used as, for example, a light guide plate that is a component in a display unit of an audio product. As shown in FIGS. 8 and 9, the diffusing material is uniformly distributed inside the light guide plate 500, and the light from the light source 501 propagates through the diffusing material and shines uniformly. Plate) 502 is illuminated. In such a rectangular parallelepiped product 400, the end receiving light from the light source 501 is required to have a perpendicularity with the adjacent surface, smoothness of the surface, etc., and is manufactured with high accuracy by being manufactured with the mold according to the present invention. It can be removed smoothly from the mold.

Claims (2)

A fixed side mold and a movable side mold that is movable in a pulling direction that is separated from the fixed side mold when the mold is opened are movable, and the mating portion between the fixed side mold and the movable side mold includes: A mold structure corresponding to a rectangular parallelepiped product and having a cavity having an inner volume of the rectangular parallelepiped product,
A die structure for a rectangular parallelepiped product, wherein all of the three opposing faces in the cavity are inclined with respect to the drawing direction . The three adjacent surfaces of the cavity having a rectangular parallelepiped internal volume corresponding to the rectangular parallelepiped product are configured by a fixed mold, and the remaining three surfaces of the cavity are configured by a moving mold. The mold structure of the rectangular parallelepiped product according to claim 1 .

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