JP2017213695A - Molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extract an under cut part even with less movement of a core.SOLUTION: A separation core 51 and a separation core 52 move in a center axial direction in a center core 40 side and the separation cores 51 and 52 separate from a molded article P, when the center core 40 moves in a lower direction. A space is generated between the separation cores 51 and 52 and between separation cores 53 and 54 because the separation core 53 and the separation core 54 move to a center core 40 side. The separation core 53 and the separation core 54 move in the center core 40 side when the center core 40 moves in the lower direction. When movements of the separation cores 51 to 54 are completed, a protrusion 70 for forming an undercut part P1 separates from the undercut part P1 and mold release is conducted without contacting the protrusion 70 with the undercut part P1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a molding die.

  Patent Document 1 discloses an undercut processing mechanism for easily removing the undercut portion. This processing mechanism has a first divided core and a second divided core that are alternately arranged in the circumferential direction during molding. At the time of die-cutting of the molded product, the plurality of first divided cores move along the escape direction so as to go from the molding position toward the axis of the undercut portion. Thereafter, the second split core moves to the mold release position along an inclined direction obtained by synthesizing the escape direction in the mold release direction. The first split core and the second split core have different timings for moving in the axial center direction of the undercut portion and different directions for movement, so that the undercut can be easily removed.

JP 2013-237212 A

  In the case of the processing mechanism of Patent Document 1, the first divided core and the second divided core are alternately arranged in the circumferential direction during molding, and the first divided core and the second divided core are removed from the molded product when the first divided core is removed. The core is moved in the axial direction, and the first divided core is moved below the second divided core. About the 1st division core, movement to a plurality of directions, movement to an axial direction, and movement to the lower part of the 2nd division core is required, and the space for moving the 1st division core in the up-and-down direction is needed Become.

  The present invention has been made under the above-described background, and an object thereof is to allow the undercut portion to escape even with a small movement of the core.

The present invention is capable of moving in the center direction of the molded product and in the direction opposite to the center direction, and is formed with a first divided core for molding an undercut, the first divided core facing the first divided core, the center direction and the center direction. A second split core that forms an undercut;
A third divided core that is adjacent to the first divided core and the second divided core and is movable in the central direction and the direction opposite to the central direction and that forms an undercut; the first divided core and the first divided core; Adjacent to the second divided core, facing the third divided core, movable in the central direction and the direction opposite to the central direction, and having a fourth divided core for forming an undercut. Outer surfaces of the first divided core, the second divided core, the third divided core, and the fourth divided core are connected at a molding position, and at the time of mold release, the first divided core and the second divided core are moved to the molding position. A molding die is provided in which the third divided core and the fourth divided core move from the molding position to the central direction after moving in the central direction.

  In the present invention, it has a center core, and at the time of molding, the center core is located inside the first divided core, the second divided core, the third divided core, and the fourth divided core, and at the time of mold release The center core is moved relative to the first split core, the second split core, the third split core, and the fourth split core in the direction of slipping out of the center core, and the center core is pulled out. The first divided core, the second divided core, the third divided core, and the fourth divided core may move to the space.

  According to the present invention, the undercut portion can be removed even with a small movement of the core.

1 is a cross-sectional view of a molding die 1 according to an embodiment of the present invention. The enlarged view of the cross section of the upper part of the molded article P and the split cores 51-54 at the time of shaping | molding. The figure which looked at the movable mold | type 11 from the negative direction side of the Z-axis to the positive direction side. The figure which showed the state at the time of shaping | molding of the upper part of the split cores 51-54. The figure which showed the end surface of the positive direction side of the Z-axis at the time of shaping | molding of the split cores 51-54. Sectional drawing of the shaping die 1 at the time of mold release. The figure which showed the state at the time of mold release of the upper part of the division | segmentation cores 51-54. The enlarged view of the cross section of the upper part of the division | segmentation cores 51-54 at the time of mold release P and mold release. Sectional drawing of the shaping die 1 at the time of mold release. The figure which showed the state at the time of mold release of the upper part of the division | segmentation cores 51-54. The enlarged view of the cross section of the upper part of the division | segmentation cores 51-54 at the time of mold release P and mold release.

  Hereinafter, a molding die 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a molding die 1 in a state where a molded product P is being molded. FIG. 1A is a cross-sectional view of the molding die 1 along the X-axis direction. FIG. 1B is a cross-sectional view of the molding die 1 along the Y-axis direction. The molding die 1 is a die for molding a molded product P having an undercut portion. In the figure, directions are indicated by orthogonal X-axis, Y-axis, and Z-axis, the left-right direction is the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction. In the figure, “X” in “○” means an arrow pointing from the front to the back of the drawing, and “●” in “○” in the back of the drawing. It means an arrow from to the front. In addition, the dimension of each member described in the figure is different from the actual dimension so that the shape and positional relationship of each member can be easily understood.

  FIG. 2 is an enlarged view of a cross section of the upper part of the molded product P and the split cores 51 to 54 at the time of molding. The molded product P has a cylindrical shape having a space inside and a taper on the lower side. The molded product P has an undercut portion P1 along the circumferential direction on the inner surface of the lower portion. In the present embodiment, the material of the molded product P is a synthetic resin, but is not limited to a synthetic resin and may be other materials.

  The fixed mold 10 is a mold that molds the outer surface of the molded product P, and includes a fixed mold 100, a fixed mold 101, and a fixed mold 102. The fixed mold 101 is a mold for molding the outer surface of the molded product P, and the fixed mold 102 is a mold for molding a hole P2 penetrating from the outside to the inside on the upper side of the molded product P. The fixed mold 101 and the fixed mold 102 are disposed inside a hole provided in the fixed mold 100.

  Below the fixed mold 10, the movable mold 11 is located. The movable mold 11 includes a split core 51 (first split core), a split core 52 (second split core), a split core 53 (third split core), and a split core 54 (first split) for molding the inner surface of the molded product P. 4 cores). FIG. 3 is a view of the movable mold 11 as viewed from the negative direction side of the Z axis to the positive direction side. The split core 51 and the split core 52 slide in the positive and negative directions of the X axis, and the split core 53 and the split core 54 slide in the positive and negative directions of the Y axis. The split core 51 has a hole 51A that penetrates in the Z-axis direction and into which the pin 31 is inserted, and the split core 52 has a hole 52A that penetrates in the Z-axis direction and into which the pin 32 is inserted. The split core 53 has a hole 53A that penetrates in the Z-axis direction and into which the pin 33 is inserted, and the split core 54 has a hole 54A that penetrates in the Z-axis direction and into which the pin 34 is inserted. The holes 51A to 54A are rounded rectangles, and the lengths of the holes 51A and the holes 52A in the longitudinal direction are the same. The lengths of the holes 53A and 54A in the longitudinal direction are the same, but are longer than the lengths of the holes 51A and 52A in the longitudinal direction. The hole 51A has a central axis inclined in the positive direction of the X axis, the hole 52A has a central axis inclined in the negative direction of the X axis, and the hole 53A has a positive direction in which the central axis is the Y axis. The hole 54A has a central axis inclined in the negative direction of the Y axis.

  FIG. 4 is a diagram showing a state during molding of the upper part of the split cores 51 to 54. FIG. 5 is a view showing an end face on the positive side of the Z-axis when the divided cores 51 to 54 are molded. In FIG. 4, the lower portion of the split cores 51 to 54 is not shown in order to prevent the drawing from becoming complicated. The split cores 51 to 54 have a shape in which a cylinder having a space inside and a taper on the lower side is divided into four in the circumferential direction. The split core 53 and the split core 54 are on the positive side of the Z axis. The end surface of the arc has an arc shape. As shown in FIG. 5, the split core 51 and the split core 52 have a shape in which the inner periphery is longer than the outer periphery, as shown in FIG. Further, in the split core 51 and the split core 52, the side connecting the outer periphery and the inner periphery forms an angle α with respect to the X axis. The divided cores 51 to 54 have a convex portion 70 for forming the undercut portion P1.

  Below the movable mold 11 is a guide portion 12 that moves the split core 51 and the split core 52 along the X axis and moves the split core 53 and the split core 54 along the Y axis. The guide portion 12 is provided with a hole that penetrates the guide portion 12 in the Z-axis direction and into which a support rod 21 described later is inserted. The guide unit 12 has a center core 40. The center core 40 is a rod-like member, has a taper on the upper side, and has a diameter on the upper end side smaller than a diameter on the lower end side. The center core 40 is located in a space between the divided core 51 and the divided core 52 and between the divided core 53 and the divided core 54.

  Further, the guide portion 12 has a rod-shaped pin 31, a pin 32, a pin 33, and a pin 34 having a circular cross section. The pin 31 and the pin 32 have the same position in the Y-axis direction, and are arranged with a predetermined interval across the center core 40. The pin 31 is disposed to be inclined from the Z-axis direction to the positive direction of the X-axis, and the pin 32 is disposed to be inclined from the Z-axis direction to the negative direction of the X-axis. Further, the pin 33 and the pin 34 have the same position in the X-axis direction, and are arranged with a predetermined interval across the center core 40. The pin 33 is disposed to be inclined from the Z-axis direction to the positive direction of the Y-axis, and the pin 34 is disposed to be inclined from the Z-axis direction to the negative direction of the Y-axis. The pin 31 is inserted into the hole 51 </ b> A of the split core 51, and the pin 32 is inserted into the hole 52 </ b> A of the split core 52. The pin 33 is inserted into the hole 53 </ b> A of the split core 53, and the pin 34 is inserted into the hole 54 </ b> A of the split core 54.

  A support portion 13 that supports the guide portion 12 is positioned below the guide portion 12. The support portion 13 is provided with a hole that penetrates the support portion 13 in the Z-axis direction and into which a support rod 21 described later is inserted.

  A spacer 14A and a spacer 14B are positioned below the support portion 13, and a base portion 15 to which the spacers 14A and 14B are fixed is positioned below the spacers 14A and 14B. Inside the spacers 14A and 14B, a moving part 16 for moving the movable mold 11 in the positive and negative directions of the Z axis is provided. The moving unit 16 is composed of two plates, and the two plates are fixed by screws 61. The moving part 16 has a support bar 21, and the support bar 21 is inserted into a hole provided in the guide part 12 and a hole provided in the support part 13, and is fixed to the movable mold 11 by a screw 60. ing.

  Next, the operation of the molding die 1 will be described. FIG. 1 shows a state where a molded product P is molded by the molding die 1. Moreover, FIG. 4 has shown the state (position) of the division | segmentation cores 51-54 at the time of shaping | molding. At the time of molding, the pin 31 is in contact with the split core 51, and the pin 32 is in contact with the split core 52. On the other hand, the pin 33 is not in contact with the split core 53 on the center core 40 side, is in contact with the split core 53 on the side opposite to the center core 40, and the pin 34 is not in contact with the split core 54 on the center core 40 side. The side opposite to the center core 40 is in contact with the split core 54. In this state, the split core 51 moves in the negative direction of the X axis, the split core 52 moves in the positive direction of the X axis, the split core 53 moves in the negative direction of the Y axis, and the split core 54 moves in the Y axis. It is moving in the positive direction. As shown in FIG. 4, at the time of molding, the outer surfaces of the split cores 51 to 54 are connected, and the upper end of the center core 40 is connected to the upper end of the split core 51. Moreover, as shown in FIG. 2, the convex part 70 which shape | molds the undercut part P1 in the split cores 51-54 is located in the undercut part P1.

  At the time of releasing the molded product P, after the fixed mold 10 is removed, the moving part 16 is driven upward as shown in FIG. When the moving unit 16 is driven upward, the movable mold 11 moves upward. When the movable mold 11 moves upward, the split core 51 moves along the pin 31 in the positive direction of the X axis, and the split core 52 moves along the pin 32 in the negative direction of the X axis. Since the holes 53A and 54A are longer in the longitudinal direction than the holes 51A and 52A, the pin 33 is used until the moving unit 16 moves a predetermined distance in the positive direction of the Z axis. Does not contact the split core 53, and the pin 34 does not touch the split core 54. For this reason, until the moving unit 16 moves a predetermined distance in the positive direction of the Z axis, the split core 53 does not move in the positive direction of the Y axis, and the split core 54 does not move in the positive direction of the Y axis. Does not move in the negative direction.

  FIG. 7 is a diagram illustrating a state in which the split core 51 and the split core 52 have moved, and the split core 53 and the split core 54 have not moved. In addition, in FIG. 7, illustration of the lower part of the split cores 51-54 is abbreviate | omitted. FIG. 8 is an enlarged view of a cross section of the upper part of the split cores 51 to 54 in the state of FIG.

  As shown in FIG. 7, when the split core 51 moves in the positive direction of the X axis and the split core 52 moves in the negative direction of the X axis, the convex for forming the undercut portion P1 in the split core 51 and the split core 52. The part 70 leaves | separates from the undercut part P1. Further, when the split core 51 moves in the positive direction of the X axis and the split core 52 moves in the negative direction of the X axis, a gap is generated between the split core 53 and the split core 54. Moreover, since the split core 51 and the split core 52 have shorter outer peripheries than the split core 53 and the split core 54, when the split core 51 and the split core 52 move between the split core 53 and the split core 54, the split core 51 and the split core 52 are split. There are gaps between the core 53, between the split core 51 and the split core 54, between the split core 52 and the split core 53, and between the split core 52 and the split core 54. Due to these gaps, the split core 53 moves in the positive direction of the Y axis, and the split core 54 can move in the negative direction of the Y axis. In the state of FIG. 6, since the split core 53 and the split core 54 have not moved since molding, there is no gap between the split core 53 and the molded product P and between the split core 54 and the molded product P. The convex part 70 of the split core 53 and the convex part of the split core 54 are not separated from the undercut part P1.

  After the state shown in FIG. 6, the moving unit 16 is further driven upward as shown in FIG. When the movable mold 11 moves upward, the split core 51 in contact with the pin 31 further moves in the positive direction of the X axis, and the split core 51 in contact with the pin 32 further moves in the negative direction of the X axis. When the movable mold 11 moves upward, the split core 53 that has not been in contact with the pin 33 in the state of FIG. 6 contacts the pin 33 and moves along the pin 33 in the positive direction of the Y axis. Further, when the movable mold 11 moves upward, the split core 54 that is not in contact with the pin 34 in the state of FIG. 6 contacts the pin 34 and moves along the pin 34 in the negative direction of the Y axis.

  FIG. 10 is a view showing the upper part of the split cores 51 to 54 in the state of FIG. In addition, in FIG. 10, illustration of the lower part of the split cores 51-54 is abbreviate | omitted. FIG. 11 is an enlarged view of a cross section of the upper part of the split cores 51 to 54 in the state of FIG.

  As shown in FIG. 10, when the split core 53 moves in the positive direction of the Y axis and the split core 54 moves in the negative direction of the Y axis, a gap is formed between the molded product P and the split core 53, and molding is performed. A gap is also generated between the product P and the split core 54. Moreover, the convex part 70 which shape | molds the undercut part P1 in the split core 53 and the split core 54 leaves | separates from the undercut part P1.

Thus, in this embodiment, after the split core 51 and the split core 52 move in the direction of the center axis of the center core 40, the split core 53 and the split core 54 move in the center direction of the center core 40. The convex portion 70 will sufficiently escape from the undercut portion P1. Since the convex portion 70 sufficiently escapes from the undercut portion P1, the convex portion 70 is not caught by the undercut portion P1 at the time of mold release, and the undercut portion P1 does not sag.
In the present embodiment, the split core 51 and the split core 52 move only in the positive and negative directions of the X axis, not in the positive and negative directions of the Z axis, and the split core 53 and the split core 54 move in the Y direction. Only the positive / negative direction of the axis and does not move in the positive / negative direction of the Z-axis, that is, the divided cores 51 to 54 do not move in the Z-axis direction. The split cores 51 to 54 can be moved in the space to release the mold.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

  In the embodiment described above, the split cores 51 to 54 have a space inside, and are formed by dividing a cylinder having a taper on the lower side into four in the circumferential direction, but have a space inside. It is good also as a shape which divided | segmented the polygonal cylinder into 4 in the circumferential direction. According to this modification, the cross-sectional shape of the internal space of the molded product P can be made polygonal.

  In the embodiment described above, the convex portion 70 is provided so that the undercut portion P1 is positioned below the molded product P. However, the convex portion 70 is positioned so that the undercut portion P1 is positioned below the molded product P. 70 may be provided above the divided cores 51 to 54.

DESCRIPTION OF SYMBOLS 1 ... Molding die, 10 ... Fixed type | mold, 11 ... Movable type | mold, 12 ... Guide part, 13 ... Support part, 15 ... Base part, 16 ... Moving part, 31-34 ... Pin, 40 ... Center core, 51-54 ... split core, 70 ... convex part, P ... molded product, P1 ... undercut part.

The present invention is capable of moving in the center direction of the molded product and in the direction opposite to the center direction, and is formed with a first divided core for molding an undercut, the first divided core facing the first divided core, the center direction and the center direction. A second split core that forms an undercut;
A third divided core that is adjacent to the first divided core and the second divided core and is movable in the central direction and the direction opposite to the central direction and that forms an undercut; the first divided core and the first divided core; Adjacent to the second divided core, facing the third divided core, movable in the central direction and the direction opposite to the central direction, and having a fourth divided core for forming an undercut. The outer surfaces of the first divided core, the second divided core, the third divided core, and the fourth divided core are connected at the molding position, and the first divided core and the second divided core are the molded product when released. moving direction of the position along the central axis from the molding position while keeping to the center direction Then, the third split core and the fourth split cores is movable in the said central direction, and is movable above 3 split cores and the fourth split cores provides a molding die to move to the center direction from the molding position.

In the present invention, it has a center core, and at the time of molding, the center core is located inside the first divided core, the second divided core, the third divided core, and the fourth divided core, and at the time of mold release The center core is moved relative to the first split core, the second split core, the third split core, and the fourth split core in the direction of slipping out of the center core, and the center core is pulled out. The first divided core, the second divided core, the third divided core, and the fourth divided core may move to the space.
In the present invention, the circumferential widths of the first divided core and the second divided core are narrowed from the central direction toward the opposite direction, and the first divided core is formed when the third divided core is molded. And a portion adjacent to the first divided core at the time of molding in the fourth divided core is along the first divided core, and adjacent to the second divided core at the time of molding in the third divided core. The matching portion and the portion adjacent to the second divided core at the time of molding in the fourth divided core may be configured along the second divided core.

Claims (2)

A first split core that is movable in a center direction of the molded product and in a direction opposite to the center direction, and that molds an undercut;
A second divided core that faces the first divided core and is movable in the central direction and the direction opposite to the central direction, and molding an undercut;
A third divided core which is adjacent to the first divided core and the second divided core and is movable in the central direction and the direction opposite to the central direction, and forms an undercut;
A fourth divided core which is adjacent to the first divided core and the second divided core, faces the third divided core, is movable in the central direction and the direction opposite to the central direction, and forms an undercut. Have
At the time of molding, the outer surfaces of the first divided core, the second divided core, the third divided core, and the fourth divided core are connected at the molding position,
At the time of mold release, the first divided core and the second divided core move from the molding position toward the center, and then the third divided core and the fourth divided core move from the molding position toward the center. Molding mold. Has a center core,
At the time of molding, the center core is located inside the first divided core, the second divided core, the third divided core, and the fourth divided core,
At the time of mold release, the center core has moved relative to the first split core, the second split core, the third split core, and the fourth split core in the direction of coming out, and the center core has come off. The molding die according to claim 1, wherein the first divided core, the second divided core, the third divided core, and the fourth divided core move to the space generated by the above.

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