JPS5946737B2 - How to check hole position deviation in molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for checking hole position deviation in drilling operations for synthetic resin molded products.

Conventionally, when forming synthetic resin molded products using molds and performing perforation work in post-processing, the perforation positions for each molded product were marked with writing, or the molding process was performed as shown in Figure 1. It has generally been practiced to provide a minute convex portion at a predetermined position on the mold, form a minute concave portion in the molded product after molding, and use the concave portion as the center position of the perforation.

However, the method of measuring the dimensions of each molded product and marking them with a handwritten note has the drawback of requiring a large amount of effort and time.Also, the method of forming a minute recess at the perforation position of the molded product has the disadvantage that the recess is minute, so the hole cannot be punched. At the same time, there was a drawback that it was impossible to check whether the position of the hole after drilling was shifted without using a scale or the like. The present invention has been made in view of the above-mentioned drawbacks9, and its purpose is to provide a method for easily and quickly confirming the positional deviation of a drilled hole during drilling work in post-processing of a molded product. be.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 1.

In the process of making holes such as one or more bolt insertion holes at predetermined positions in a synthetic resin molded product, a fine central convex portion 3 is formed at a predetermined position of the mold 2, 2' that will be the perforation position on the surface of the molded product 1. A circular concave portion 5 or a central convex portion having a width as fine as a score line centered on the convex portion 3 is provided at a position that is different from the diameter of a drilling tool such as a drill 4 with the convex portion 3 as the center. The molds 2, 2' are formed by providing an X-shaped recess 6 having a width as fine as a ruled line intersecting at 3.

Then, the molded product 1 is molded using the molds 2 and 2', and a hole is drilled using a drill 4, etc., centering on the central recess T of the molded product 1, which is formed in the opposite shape to the molds 2 and 2'. A circular convex portion 8 or a tip 9 of an X-shaped convex portion is left behind and formed around the hole. Either a concave portion or a circular X-shaped convex portion may be used.

Further, if providing a circular or X-shaped convex portion or concave portion on the surface of the molded product causes a problem, it may be provided at a predetermined position of the molds 2, 2' which will be the back surface of the molded product 1. That is,
The central concave portion T of the molded product 1 is removed by cutting D during drilling, but the distance between the circular convex portion 8 formed concentrically around the hole and the outer periphery of the hole, and the tip of the X-shaped convex portion The position of the hole can be easily determined by visually observing or applying a ruler to the point where the portions 9 intersect diagonally and the center point of the hole.

Therefore, the present invention provides a central protrusion or a recess at a predetermined center position of the mold, which is the perforation position on the front or back surface of the molded product, and also provides a central convex or recessed part at a position that is different from the diameter of the punching tool around this part. a circular or The structure is such that the holes are drilled around the central concave or convex portion, and the positional deviation of the hole can be confirmed by the circular or X-shaped convex or concave portions around the hole. This can be easily and quickly determined by simply guessing, and product defects in the manufacturing process can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a conventional embodiment. FIG. 2 is a cross-sectional view taken along line A-A in FIG. FIG. 3 is a sectional view showing an embodiment of the present invention. FIG. 4 is a plan view showing an embodiment of the present invention. FIG. 5 is a sectional view taken along line B-B in FIG. 4. FIG. 6 is a diagram showing an embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line C--C in FIG. 6. Explanation of symbols, 1... Molded product, 2, 2t...
Molding mold, 3... Center convex portion, 4... Drill, 5...
Circular recess, 6...X-shaped recess, 7... Center recess, 8.
...Circular convex part, 9... Tip of X-shaped convex part.

Claims (1)

[Claims] 1. A central protrusion or recess is provided at a predetermined center position of the mold, which is the position of perforation on the front or back surface of the molded product, and a circle centered on the part is provided at a position larger than the diameter of the punching tool. A circular or X-shaped concave portion or convex portion is provided, and a circular or A method for checking the positional deviation of a hole in a molded product, which comprises: drilling a hole around a concave or convex part, and checking the positional deviation of the hole using a circular or X-shaped convex or concave part around the hole.