JP2024157207A - Method for setting the processing reference position for molded products - Google Patents

Abstract

To provide a method of setting a processing reference position of a molded article that ensures the positioning accuracy relative to a processing apparatus of the molded article, and the rigidity of the molded article.SOLUTION: Provided is a method of setting a processing reference position of a molded article including a plate surface. A processing reference portion 12 which serves as a reference for positioning a molded article 1 relative to a processing apparatus 2 is provided at a central portion of the molded article 1, and the processing reference portion 12 is formed in a diamond shape when the plate surface of the molded article 1 is viewed from a front. Thereby, disposing the processing reference portion 12 serving as the positioning reference at the central portion of the molding article 1 which serves as a center of contraction enhances the positioning accuracy, and forming the processing reference portion 12 in the diamond shape enhances the rigidity of the molded article 1.SELECTED DRAWING: Figure 1

Description

This disclosure relates to a method for setting a processing reference position when forming a sheet-shaped resin vacuum formed product.

In recent years, plate-shaped resin vacuum-formed products have come into use, in which a sheet made of resin material is molded in a mold to obtain a resin molded product. These plate-shaped resin vacuum-formed products may require precise dimensional accuracy.

Patent Document 1 discloses a method for manufacturing resin molded products that can ensure high shape accuracy even for thin parts or parts with complex three-dimensional shapes, can be manufactured efficiently, and can reduce manufacturing costs.

Furthermore, Patent Document 2 discloses a molding die equipped with a gate mark shaping mechanism that can simultaneously perform molding and gate crushing processing within the die.

JP 2007-223147 A Japanese Patent Application Publication No. 9-277308

When processing a molded product, it is necessary to set the position reference of the molded product relative to the processing equipment (hereinafter referred to as the processing reference) using a part of the molded product. In particular, in the case of plate molded products, even if a specific shape is provided on the molded product to set the processing reference, the molded product itself is required to be highly rigid.

If the molded product is a resin molded product and the processing datum is set near the end of the molded product, there is a problem that precise positioning cannot be achieved due to molding shrinkage. Furthermore, if the shape set on the molded product for setting the processing datum is a simple shape such as a circle, there is a problem that the rigidity of the molded product will be reduced.

This disclosure provides a method for setting the processing reference position of a molded product that ensures the positioning accuracy of the molded product relative to the processing device and the rigidity of the molded product.

The method for setting a processing reference position for a molded product disclosed herein is a method for setting a processing reference position for a molded product that includes a plate surface, in which a processing reference portion that serves as a reference for positioning the molded product relative to a processing device is provided in the center of the molded product, and the processing reference portion is formed in a diamond shape when viewed from the front of the plate surface of the molded product.
This makes it possible to provide a diamond-shaped processing reference that can increase the rigidity of the molded product at a position where displacement caused by shrinkage of the molded product can be suppressed.

This disclosure provides a method for setting a reference position for processing a molded product that ensures the positioning accuracy of the molded product relative to the processing device and the rigidity of the molded product.

FIG. 2 is a top view of a plate mono resin vacuum formed product. FIG. 2 is a top view of a plate monolithic resin vacuum-formed product in an untrimmed state. 2 is a cross-sectional view taken along line AA of a molded product placed on the processing device. FIG.

First embodiment
Hereinafter, a method for setting a processing reference position for a vacuum-formed resin plate product according to this embodiment will be described with reference to the drawings.

Figure 1 shows an example of a plate-shaped resin vacuum molded product 1 (hereinafter, molded product 1) to be manufactured. Note that Figure 1 shows a top view of molded product 1 formed with a plate surface on the Z direction side, which is the vertical direction, and molded product 1 will be described as having a predetermined length in the XY direction, which is the horizontal direction, and being formed thin in the Z direction.

Note that FIG. 2 shows an example of a state in which the resin portion 13 outside the outer periphery of the part that will become the molded product 1 has not been trimmed during the manufacturing process of the molded product 1, and FIG. 3 is an A-A cross-sectional view showing the molded product 1 with the outer resin portion 13 not being trimmed, placed on the processing device 2.

As shown in FIG. 1, the molded product 1 has a flat plate portion 11 formed with a predetermined length in the XY direction, and a processing reference portion 12 formed at the center of the molded product 1 in the XY direction. Here, the processing reference portion 12 is formed in a diamond shape when viewed from above, which is the state in which the plate surface formed in the molded product 1 is viewed from the front, and is formed to protrude downwardly in a convex shape compared to the flat plate surface portion surrounding the processing reference portion 12.

The central portion where the processing reference portion 12 is provided is the center of contraction when the molded product 1 contracts in the XY direction. As described below, the processing reference portion 12 can be used as a reference position for positioning the molded product 1 relative to the processing device 2.

As shown in FIG. 1, in the molded product 1, the flat plate portion 11 is a portion with small unevenness in the Z direction, and the processing reference portion 12 is a portion in the center of the molded product 1 with large unevenness in the Z direction, but multiple unevenness in the Z direction is formed in addition to the processing reference portion 12.

As an example, as shown in FIG. 2, during the manufacturing process, the molded product 1 is in a state where an outer resin part 13 is provided outside the outer periphery of the shape that will be used as the final molded product 1.

The processing device 2 can place the molded product 1 while positioning it using the processing reference portion 12 of the molded product 1, and then perform the trimming process. For example, the processing device 2 can fix the molded product 1 in the placed state and remove the outer resin portion 13.

Specifically, as shown in Fig. 3, the processing device 2 has a first jig 21 that positions the molded product 1 by matching it with the processing reference portion 12, and a second jig 22 that fixes the outer resin portion 13. Typically, the first jig 21 is provided in the center of the processing device 2 in the XY direction, and multiple second jigs 22 are provided to surround the first jig 21.

The first jig 21 has a recess 21a formed in a portion of its upper surface that is recessed downward. For example, the recess 21a formed in the first jig 21 has a transferred shape into which the machining reference portion 12 formed in the molded product 1 fits. In other words, the recess 21a is formed in a diamond shape in top view and a concave shape having a predetermined depth in the downward direction on the upper surface of the first jig 21 so that the machining reference portion 12, which is a diamond shape convex downward when viewed from above, can fit into it.

The second jig 22 can fix the molded product 1 by clamping the outer resin part 13 from above and below.

The processing performed by the processing device 2 is not limited to removing the outer resin portion 13. In other words, the processing performed by the processing device 2 may be other processing that is performed by fixing the molded product 1 while positioning the molded product 1.

In this way, by making the machining reference portion 12 a diamond-shaped projection and recess when viewed from above, the rigidity of the molded product 1 can be increased compared to when the machining reference portion 12 is a simple shape such as a round shape, or when the machining reference portion 12 is a flat shape. Therefore, even when a certain contraction force occurs in the molded product 1, the amount of deformation of the molded product 1 can be suppressed.

In addition, by providing the processing reference part 12 at the center, which is the center of shrinkage of the molded product 1, the positional deviation of the processing reference part 12 due to shrinkage of the molded product 1 is small, so that the positional deviation in the XY direction with the processing device 2 can be reduced.

In addition, by making the shape of the processing reference portion 12 diamond-shaped and making the recess 21a of the first jig 21 of the processing device 2 shaped to fit with this processing reference portion 12, it is possible to suppress misalignment between the molded product 1 and the processing device 2 in the rotational direction around the Z axis without forming a key and key groove.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the invention. In other words, the above description has been omitted or simplified as appropriate for the purpose of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

For example, although the above description assumes that the processing reference portion 12 has a convex shape extending downward from the molded product 1, it may be formed to have a convex shape extending upward. Also, although the processing reference portion 12 has been described as having a diamond shape when viewed from above, it may also be formed to have a square shape when viewed from above.

The size of the machining reference portion 12 provided on the molded product 1 can be determined as desired. For example, the size of the diamond shape provided as the machining reference portion 12 in the XY direction and the protrusion amount of the convex shape in the Z direction can be changed depending on the rigidity required for the molded product 1.

When changing the shape of these machining reference parts 12, the shape of the first jig 21 of the processing device 2 can also be changed so that it fits into the changed machining reference parts 12.

Reference Signs List 1 Molded product 2 Processing device 11 Flat plate portion 12 Processing reference portion 13 Outer resin portion 21 First jig 21a Recess 22 Second jig

Claims (1)

A method for setting a processing reference position for a molded product including a plate surface, comprising:
A processing reference portion serving as a reference for positioning the molded product relative to a processing device is provided at the center of the molded product,
The processing reference portion is formed in a diamond shape when viewed from the front of the plate surface of the molded product.
How to set the reference position for molding.

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