Method for setting the processing reference position of molded products

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

Technical Field

[0001] The present disclosure relates to a method for setting a processing reference position when forming a sheet resin vacuum formed product.

Background Art

[0002] In recent years, sheet resin vacuum formed products obtained by forming a sheet made of a resin material with a mold have been used. Such vacuum formed products of sheet resin may require precise dimensional accuracy.

[0003] Patent Document 1 discloses a method for manufacturing a resin molded product that can ensure high shape accuracy, can be efficiently manufactured, and can reduce manufacturing costs even for thin parts or parts having a complex three-dimensional shape.

[0004] Furthermore, Patent Document 2 discloses a molding die with a gate trace shaping mechanism that can perform molding and gate filling processing simultaneously in the die.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] When processing a molded product, it is necessary to set a position reference (hereinafter, processing reference) of the molded product with respect to the processing device using a part of the molded product. In particular, in the case of a sheet molded product, even when a predetermined shape is provided on the molded product to set the processing reference, the molded product itself is required to have high rigidity.

[0007] ​ Here, if the molded product is a resin molded product and the processing reference is set near the edge 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 reference is a simple shape such as a circle, there is a problem that the rigidity of the molded product will be low.

[0008] This disclosure provides a method for setting the processing reference position of a molded product while ensuring positioning accuracy of the molded product relative to the processing equipment and rigidity of the molded product. [Means for solving the problem]

[0009] The method for setting the processing reference position of a molded product according to this disclosure is a method for setting the processing reference position of a molded product including a plate surface, wherein a processing reference portion that serves as a reference for positioning the molded product with respect to a processing device is provided in the center of the molded product, and the processing reference portion is formed in a rhombic shape when viewed from the front of the plate surface of the molded product. This allows for the placement of a rhombus-shaped processing reference that can increase the rigidity of the molded product at a location that can suppress positional displacement caused by shrinkage of the molded product. [Effects of the Invention]

[0010] This disclosure provides a method for setting the processing reference position of a molded product while ensuring positioning accuracy of the molded product relative to the processing equipment and rigidity of the molded product. [Brief explanation of the drawing]

[0011] [Figure 1] This is a top view of a sheet-type vacuum-formed resin product. [Figure 2] This is a top view of a sheet-type vacuum-formed resin product in its untrimmed state. [Figure 3] This is a cross-sectional view AA showing the molded product placed on the processing equipment. [Modes for carrying out the invention]

[0012] Embodiment 1 The following describes the method for setting the processing reference position of a sheet-type resin vacuum-formed product according to this embodiment, with reference to the drawings.

[0013] Figure 1 shows an example of a vacuum-formed sheet resin product 1 (hereinafter referred to as "molded product 1") that is manufactured. Figure 1 is a top view of the molded product 1, which is formed with a plate surface on the Z-direction side (vertical direction). The molded product 1 is described as having a predetermined length in the XY-direction (horizontal direction) and being formed thinly in the Z-direction.

[0014] Figure 2 shows an example of a state in which the resin portion 13 outside the outer circumference of the part that will become the molded product 1 is not trimmed during the manufacturing process of the molded product 1, and Figure 3 is a cross-sectional view AA showing the state in which the molded product 1 with the outer resin portion 13 not trimmed is placed on the processing device 2.

[0015] As shown in Figure 1, the molded product 1 has a flat plate portion 11 formed to 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 rhombus shape when viewed from above, which is the state when the plate surface formed on the molded product 1 is viewed from the front, and is formed to protrude downward in a convex shape compared to the flat plate surface portion surrounding the processing reference portion 12.

[0016] The central area where the processing reference section 12 is provided is the center of contraction when the molded product 1 shrinks in the XY direction. As will be described later, the processing reference section 12 can be used as a reference position for positioning the molded product 1 relative to the processing device 2.

[0017] As shown in Figure 1, in the molded product 1, the flat plate portion 11 is a location with small irregularities in the Z direction, and the processing reference portion 12 is a location in the center of the molded product 1 with large irregularities in the Z direction. However, multiple irregularities in the Z direction are formed in addition to the processing reference portion 12.

[0018] Here, as an example, as shown in FIG. 2, in 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 to be used as the final molded product 1.

[0019] The processing device 2 can perform a trimming process while positioning the molded product 1 in a state where the processing reference part 12 of the molded product 1 is utilized. For example, the processing device 2 can fix the molded product 1 in a placed state and remove the outer resin part 13.

[0020] Specifically, as shown in FIG. 3, the processing device 2 has a first jig 21 that performs positioning by matching the processing reference part 12 of the molded product 1, and a second jig 22 that fixes the outer resin part 13. Typically, in the XY direction, the first jig 21 is provided at the center of the processing device 2, and a plurality of second jigs 22 are provided so as to surround the first jig 21.

[0021] A recess 21a is formed in a part of the upper surface of the first jig 21 so that a part of the upper surface is recessed downward. For example, the recess 21a provided in the first jig 21 has a transfer shape into which the processing reference part 12 provided on the molded product 1 fits. That is, the recess 21a is formed in a recessed shape that has a rhombus shape in a top view and a predetermined depth downward on the upper surface of the first jig 21 so that the processing reference part 12, which is a convex shape downward with a rhombus shape in a top view, can fit.

[0022] The second jig 22 can fix the molded product 1 by sandwiching the outer resin part 13 from above and below.

[0023] Note that the processing performed by the processing device 2 is not limited to the removal of the outer resin part 13. That is, the processing performed by the processing device 2 may be other processing that fixes the molded product 1 while positioning the molded product 1.

[0024] In this way, by making the processing reference portion 12 have a rhombus-shaped uneven surface when viewed from above, the rigidity of the molded product 1 can be increased compared to when the processing reference portion 12 has a simple shape such as a round shape or when the processing reference portion 12 has a flat shape. Therefore, even when a predetermined shrinkage force is generated in the molded product 1, the amount of deformation of the molded product 1 can be suppressed.

[0025] Furthermore, by providing the processing reference section 12 at the center of the shrinkage of the molded product 1, the positional displacement of the processing reference section 12 due to the shrinkage of the molded product 1 is reduced, thereby reducing the positional displacement in the XY direction relative to the processing device 2.

[0026] Furthermore, by making the shape of the processing reference section 12 a rhombus shape, and by making the recess 21a of the first jig 21 of the processing device 2 a shape that fits with this processing reference section 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 or keyway.

[0027] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. In other words, the above description has been omitted and simplified as appropriate for the sake of clarity, and those skilled in the art can easily change, add, and modify each element of the embodiments within the scope of the present invention.

[0028] For example, although the processing reference portion 12 was described above as having a convex shape in the downward direction from the molded product 1, it may also be formed with a convex shape in the upward direction. Also, although the processing reference portion 12 was described as having a rhombus shape when viewed from above, it may also be a square when viewed from above.

[0029] Furthermore, the size of the processing reference section 12 provided on the molded product 1 can be determined arbitrarily. For example, the size of the rhombus shape provided as the processing reference section 12 in the XY direction can be changed, or the amount of protrusion of the convex shape in the Z direction can be changed, depending on the rigidity required for the molded product 1.

[0030] Furthermore, if the shape of these machining reference sections 12 is changed, the shape of the first jig 21 of the machining apparatus 2 can also be changed so that it fits into the modified machining reference section 12. [Explanation of Symbols]

[0031] 1 Molded product 2 Processing equipment 11 Flat plate part 12 Processing reference section 13 Outer resin part 21 First jig 21a Recess 22 Second jig

Claims

[Claim 1] A method for setting the processing reference position of a sheet resin vacuum-formed product that is processed on a processing device after molding, A processing reference section, which serves as a reference for positioning the molded product relative to the processing device, is provided at the center corresponding to the center of the molding shrinkage of the molded product, The aforementioned processing reference portion is formed in a rhombic shape when viewed from the front of the plate surface of the molded product. Method for setting the processing reference position of a molded product.

Images