JPH0549007B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a processing mold for processing a through hole for positioning of a plastic product having an inclined surface. The present invention relates to a processing mold that secures the positioning diameter of a hole.

``Prior art'' In the process of molding products such as plastics using a mold, conventionally, as shown in Figure 3, when using the product, the inclination angle with respect to the vertically upward mold release direction of the mold was determined. Through-round hole 1 in machined surface a tilted by θ
If you want to secure the positioning diameter D of
If the machining pin 3 of the mold 2 to be inserted into the mold 2 is pulled out vertically as it is, an undercut will occur and the positioning diameter D cannot be secured. There was no particular problem, and the hole size was simply secured by increasing the machining effort.

``Problem to be solved by the invention'' A through-hole for positioning is machined at right angles to a machining surface that is inclined to the horizontal. The axial direction of the through-hole is inclined with respect to the mold release direction in the vertical vertical direction, and it does not match the vertical direction in which the mold with the processing pin is released, resulting in undercuts and the penetration The positioning diameter of the round hole cannot be ensured.

In order to eliminate such drawbacks, the present invention is designed to form a through hole by pulling out the machining pin of the mold for machining the through hole vertically from the inclined round hole without undercutting. be.

"Means for Solving the Problems" The present invention takes the following measures to solve the above problems.

When machining a through-round hole perpendicular to the slope of a plastic product having a sloped surface with respect to the horizontal, the processing pin of the processing mold is formed into a half-cylindrical piece, and this half-cylindrical Each piece is fixed to an upper fixed mold and a lower movable mold, and the contact surfaces of both half-cylindrical pieces are removed and cut in the vertical direction to the slope angle of the slope to form sliding surfaces respectively, and the processing mold is When both half-cylindrical pieces are clamped, the intersection point with the center line of the processing pin is formed so as to ensure the positioning diameter of the through hole.

"Operation" Next, the operation of the present invention will be explained. The fixed side half cylinder piece 3a and the movable side half cylinder piece 3b that are fitted into the through hole 1 of the plastic product 6 are the half cylinder piece 3a when die-cutting is performed vertically in the mold release direction E. The sliding surface 4 of the half-cylindrical piece 3b and the sliding surface 5 of the half-cylindrical piece 3b slide against each other and come out vertically without getting caught. Therefore, there is no undercut portion, and the positioning diameter D is accurately ensured at the diameter passing through the intersection of the center line b of the processing pin 3 and the vertical cutting line d, which serves as the sliding surface. In this case, in the processed through-hole 1, symmetrical loop-hole portions 7, 7 with a diameter D extending from the upper surface on one side to the lower surface on the other side are formed.

"Example" Next, an example of the present invention will be described. FIG.
FIG. 2 is a side cross-sectional view showing a state in which a through-hole is machined according to the present invention, and FIG. 2 is a perspective view of the through-hole in which the through-hole is formed on the machined surface.

In the figure, a plastic product 6 is sandwiched between a fixed mold 2a and a movable mold 2b.
When drilling the through hole 1 perpendicularly to the machining surface, the fixed side half-cylindrical piece 3a and the movable side half-cylindrical piece 3b of the half-cylindrical machining pin 3 are divided into two halves.
The sliding surfaces 4 and 5 are formed by cutting the merged contact surfaces of the working pin 3 along a vertical cutting line d passing through the center point c of the processing pin 3. Then, the fixed mold 2a and the movable mold 2b, which have secured the positioning diameter D on a diametrical plane parallel to the machined surface a passing through the center point c (i.e., the contact point between the sliding surfaces 4 and 5), are vertically released from the molds. When pulled out in the direction E, the half-cylindrical pieces 3a and 3b fixed to the fixed mold 2a and the movable mold 2b, respectively, will be undercut as the sliding surfaces 4 and 5, which are cutting surfaces, slide against each other. It will come out smoothly.

Therefore, the machined through-hole 1 has a shape in which the positioning diameter D is accurately ensured at the center.

This through-round hole 1 has a shape in which the diameter on the center line passes through the narrowed circumferential part at the point where it exits the inclined upper surface part, so as shown in FIG. Through-hole portions 7, 7 are formed which penetrate from the upper surface toward the lower surface symmetrically with respect to the diameter line e at the center of the hole.

``Effects of the Invention'' As described above, the present invention is applicable to the machining pin of the machining die when machining a through-hole in the machining surface of a plastic product having a surface sloped with respect to the horizontal at a right angle to the slope. It is formed into two half-cylindrical pieces, each of which is fixed to an upper fixed mold and a lower movable mold, and the contact surfaces of both half-cylindrical pieces are pulled out and moved vertically to adjust the inclination angle of the inclined surface. They are cut to form sliding surfaces, and when both half-cylindrical pieces of the processing mold are clamped, the intersection with the center line of the processing pin is formed to ensure the size of the positioning diameter of the through hole. This is what I did.

Therefore, with respect to the vertical punching of the processing die 2, the through hole 1, which is perpendicular to the inclined processing surface, has the effect of allowing the processing die to be extracted without undercutting and ensuring accurate dimensional positioning. That's what I got.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the machining state of a through-round hole according to the present invention, Fig. 2 is a perspective view of a through-hole with a through-hole formed on the machined surface, and Fig. 3 is a conventional machining method. FIG. 3 is a side sectional view showing a processing state in which a through-hole is formed using a mold. 1...Through round hole, 2...Mold, 3...Processing pin, 4, 5...Sliding surface, 7...Through hole portion, 2a...
...fixed type, 2b...movable type, 3a, 3b...half cylinder piece, a...machined surface, b...center line, c...center point, d...cutting line, e...diameter line, θ...Tilt angle, D...Positioning diameter, E...Mold release direction.

Claims (1)

[Claims] 1. When machining a through-hole in the machining surface of a plastic product that has an inclined surface with respect to the horizontal, at right angles to the inclined surface, the machining pin of the machining mold is formed into a half cylinder piece, and this half is The cylindrical pieces are each fixed to an upper fixed mold and a lower movable mold, and the contact surfaces of both halves of the cylindrical pieces are cut out and cut in the vertical direction to the angle of inclination of the sloped surfaces to form respective sliding surfaces. A plastic product having an inclined surface, characterized in that when both half cylinder pieces of the mold are clamped, the intersection point with the center line of the processing pin secures the positioning diameter of the through hole. A mold for processing through-holes for positioning.