JP2522870Y2 - Molds for molding and angular pins - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a slide core that forms a part of a cavity by using angular pins that are oblique to the opening direction when a pair of mold plates that constitute the cavity are opened. In a direction perpendicular to the mold opening direction to reliably release the undercut portion of the product from the mold.

[0002]

2. Description of the Related Art A molding die 100 shown in FIG. 5 has a fixed mold plate 101 and a movable mold plate 102.
01 and 102 are relatively openable and closable. Movable mold plate 1
02 is provided with a slide core 103 so as to be slidable in a direction orthogonal to the opening and closing direction. These two molds 101 and 102 and the slide core 10
3, the cavity 105 of the molded product 104 is formed. In particular, the slide core 103 corresponds to an undercut portion such as a hole or a groove of the molded product 104.

The fixed side template 101 includes a template 101,
An angular pin 106 is fixed in a posture inclined at a predetermined angle with respect to the opening / closing direction of 102. The angular pin 106 protrudes below the fixed mold plate 101 and is inserted through the through hole 107 of the slide core 103. Therefore, when the mold plates 101 and 102 are opened in the vertical direction in the figure, the slide core 103 is moved rightward in the figure along the angular pins 106.

In order to fix the angular pin 106, an inclined through hole 108 and a counterbore hole 109 are first formed in the fixed mold plate 101. Then, the shaft portion 110 is inserted into the through hole 108 and the base shaft portion 111 is press-fitted, and the flange portion 112 is engaged with the counterbore hole 109. Then, a holding plate 113 such as a fixed-side mounting plate is fixed to the fixed-side template 101 having the counterbore hole 109 opened, and the flange 112 is fixed.

Conventionally, when the flange 112 is fixed by the holding plate 113, the flange 112 protruding above the counterbore 109 is cut and flattened as shown in FIG. This processing is performed before mounting the angular pin 106.
Depending on the mounting inclination angle, it can be carried out in advance with a milling machine or a lathe, but sometimes it is processed according to the plate surface after being mounted on a mold.

[0006]

When machining in advance, it has been difficult to adjust the amount of grinding of the flange in accordance with the mounting inclination angle. Further, even if the grinding can be performed correctly, it is difficult to press-fit and fix the angular pin 106 into the through hole 108 in a correct direction such that the ground surface and the upper surface of the template coincide. In addition, working with the template after press-fitting the angular pin 106 is different from working of a single component, which requires time and effort for setup.

An object of the present invention is to enable an angular pin for moving a slide core in a molding die to be commonly used without processing regardless of an inclination angle.

[0008]

According to the present invention, there is provided a molding die and an angular pin for moving a slide core by an angular pin. The spherical portion is pressed by a pressing plate of the molding die, and the angular pin is fixed to the mold plate of the molding die.

[0009]

The member for fixing the angular pin contacts the flange of the angular pin with the spherical portion to fix the angular pin regardless of the inclination angle of the angular pin.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding die 1 of this embodiment shown in FIG. 1 has a fixed mold plate 2 and a movable mold plate 3, and both mold plates 2 and 3 are relatively openable and closable. . A slide core 4 is provided on the movable mold plate 3 so as to be slidable along a direction orthogonal to the opening and closing direction. These two molds 2, 3
The slide core 4 forms a cavity 6 of the molded product 5, and the slide core 4 particularly corresponds to an undercut portion such as a hole or a groove of the molded product 5.

An angular pin 7 is fixed to the fixed mold plate 2 in a posture inclined at a predetermined angle with respect to the opening and closing directions of the mold plates 2 and 3. In the angular pin 7, a base shaft portion 9 is press-fitted into a fixing hole 8 formed in the fixed-side mold plate 2, and a flange portion 10 is engaged with a counterbore portion 11. The shaft portion 12 at the tip projects obliquely below the fixed mold plate 2 and is inserted through a slant through hole 13 provided in the slide core 4 with a predetermined gap.

The upper surface of the flange portion 10 of the angular pin 7 of this embodiment is a spherical portion 14. The lower surface of a holding plate 15 such as a fixed-side mounting plate mounted on the upper surface of the fixed-side mold plate 2 comes into point contact with the spherical portion 14 and the angular pin 7
Is fixed.

Since the upper surface of the flange portion 10 of the angular pin 7 is the spherical portion 14 as described above, if the depth of the counterbore portion 11 is appropriately set with respect to the inclination angle of the angular pin 7,
The flange 10 can always be brought into point contact with the holding plate 15. That is, the angular pin 7 does not need to be processed at any inclination angle. Also, no excessive force is applied to each plate during assembly.

As can be seen from FIG. 2, the depth Z of the counterbore portion 11 is expressed by the following equation. Z = L−L ₁ = (R / cos θ) −L ₁ As described above, if the depth of the counterbore portion 11 is determined according to the inclination angle θ, one type of angular pin 7 can be provided as shown in FIG. It can be applied to any inclination angle as a common part.

In this embodiment, when the two mold plates 2 and 3 open vertically in the drawing, the slide core 4 is moved rightward in the drawing along the angular pins 7. In this case, the force applied from the slide core 4 to the inclined angular pin 7 is:
The force is divided into a component force perpendicular to the angular pin 7 and a component force parallel to the angular pin 7. The component force applied parallel to the angular pin 7 is
It is added to the flange portion 10, but its value is small because the inclination angle is small. Therefore, there is no problem even if the flange portion 10 is supported by the point contact of the spherical portion 14. Conversely, the collar 1 of the present embodiment
0 does not require additional machining as in the prior art.
Heat treatment, and the mechanical properties can be improved as compared with the prior art.

FIG. 4 shows another embodiment of the present invention.
In the angular pin 20 of this embodiment, a part of the upper surface of the flange portion 21 is a spherical portion 22. Thus, the flange 21
Only the portion that comes into contact with the member for pressing and fixing may be a spherical portion.

In the embodiment described above, the angular pins 7 are provided on the fixed mold plate 2 and the slide cores 4 are provided on the movable mold plate 3. However, the order may be reversed.

[0018]

According to the present invention, a spherical portion is provided on the flange portion of the angular pin, and the angular pin is supported by pressing the spherical portion by point contact. Accordingly, if the counterbore depth and the like on the mounting side are appropriately set, the common angular pin can be mounted on the molding die without post-processing regardless of the inclination angle.

[Brief description of the drawings]

FIG. 1 is a sectional view of a molding die according to a first embodiment.

FIG. 2 is a diagram showing a depth of a spot facing portion in the embodiment.

FIG. 3 is a diagram showing a case where the inclination angles are different in the embodiment.

FIG. 4 is a diagram showing another embodiment.

FIG. 5 is a cross-sectional view showing an example of a conventional molding die.

FIG. 6 is a diagram showing an example of a conventional angular pin grinding process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 2 Fixed mold plate 3 Movable mold plate 4 Slide core 6 Cavity 7,20 Angular pin 10,21 Flange part 14,22 Spherical part

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of mold plates, which are openable and closable, forming a cavity, and one of the pair of mold plates is provided on one of the pair of mold plates so as to slide in a direction orthogonal to the opening and closing direction of the template. A mold having a slide core forming a part and an angular pin attached to the other of the pair of template plates so as to be at a predetermined angle with respect to the opening and closing direction of the template plate and slidably inserted into the slide core. In the metal mold, the angular pin is engaged with the other side of the template at a flange having a spherical portion, and the spherical portion of the flange is fixed at the other side of the template. Mold for molding. 2. A pair of openable and closable templates forming a cavity, and a part of the cavities provided on one of the templates so as to slide in a direction perpendicular to the opening and closing direction of the templates. A flange portion provided on a molding die having a slide core and configured to engage with the other side of the template, and a shaft portion for inserting the slide core in a direction oblique to the opening and closing direction of the template. The angular pin provided, wherein at least a part of the flange portion is a spherical portion, and the spherical portion is fixed to the other side of the template.