JPH01200944A - Method for processing terminal of resin extrusion molded product - Google Patents

Abstract

PURPOSE:To enhance appearance and to reduce a cycle time to a large extent, by forming the terminal of a resin extrusion molded product into a shape and dimension reduced by the thickness of an injection molded part by applying cutting processing thereto so as to form the injection molded part having an almost uniform thickness. CONSTITUTION:The terminal of a resin extrusion molded product 1 is subjected to cutting processing to be formed into a shape and dimension reduced by the thickness T of an injection molded part 2 so as to form the injection molded part 2 having an almost uniform thickness along the outer shape of said terminal. After cutting processing is applied to the terminal of the resin extrusion molded product 1 as mentioned above, the injection molded part 2 is formed by injection molding to be bonded to the cut terminal to make it possible to form the injection molded part 2 having the almost uniform thickness. Therefore, the injection molded part 2 is thinly formed so as to have an almost uniform thickness along the outer shape of the terminal of said molded product 1 and the cooling speed at the time of the cooling of the molded product becomes uniform over the whole and also becomes fast while a sink or weld becomes difficult to generate on the surface of the molded product. As a result, appearance is enhanced and a cooling time, that is, a cycle time can be reduced to a large extent.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method of cutting the end of a resin extrusion molded product when joining an injection molded member to the end of the resin extrusion molded product such as a side protection molding of an automobile. It is something that I feel.

[Prior Art] Conventionally, when joining an injection molded part to the end of a resin extrusion molded product, the end part of the resin extrusion molded product is cut to have one plane perpendicular to the longitudinal direction, and the injection molded part is attached to the end face. The end faces of the resin extrusion molded product are abutted against each other to join them, and the injection molded part is thicker in the longitudinal direction of the resin extrusion molded product and changes in shape in the longitudinal direction and the width direction.

[Problems to be Solved by the Invention] As described above, the injection molded part is thick in the longitudinal direction of the resin extrusion molded product and changes in shape in the longitudinal and width directions, so the cooling rate during mold cooling is There are sink marks and welds on the surface depending on the position.

Flow marks are likely to occur and the appearance is poor (in addition, there are problems in that the cooling rate is generally slow and it takes a long time to cool down, and injection molded parts have lower rigidity than extrusion molded products and Since it is a butt joint on vertical surfaces,
There is also a problem in that the bonding strength is low.

[Means for solving the problem] This will be explained with reference to the drawings. In joining an injection molded part to the end of the resin extrusion molded product according to the present invention to solve the above problems, the method of cutting the end of the resin extrusion molded product is based on the outer shape of the joined injection molded part 2. The end of the resin extrusion molded product l is cut into a shape and dimension 1a that is smaller by the thickness numerator of the injection molded part 2 so as to form an injection molded part 2 with a substantially uniform thickness along the It is something.

[Effects] Since the injection molded part 2 having a substantially uniform thickness and a thin wall is formed along the outer shape of the injection molded part 2, the cooling rate during molding cooling is uniform over the entire part, and the cooling rate is fast. Sinks and welds on the surface.

Flow marks etc. are less likely to occur, improving the appearance and significantly reducing cycle time.

[Example code] The present invention will be described in detail with reference to the drawings.

1 is a resin extrusion molded product, 2 is an injection molded part joined to the end of the resin extrusion molded product 1, and the end of the resin extrusion molded product 1 follows the outer shape of the injection molded part 2 joined to it,
The shape and dimensions 1a are reduced by the thickness numerator of the injection molded part 2 so as to form the injection molded part 2 with a substantially uniform thickness.
It is cut and processed.

After cutting the end of the resin extrusion molded product 1 in this way, the injection molded part 2 is injection molded and joined.
An injection molded part 2 of substantially uniform thickness can be formed.

Therefore, the injection molded part 2 according to the present invention has a substantially uniform thickness and a thin wall along its outer shape, and the cooling rate during molding cooling is uniform over the entire part, and the cooling rate is high. This reduces the occurrence of sink marks, welds, flow marks, etc. on the surface, improves the appearance, and significantly reduces cooling time, that is, cycle time. In addition, since the injection molded part 2 and the end of the resin extrusion molded product 1 are joined in multiple stages in a direction perpendicular to the longitudinal direction, it has excellent rigidity and also has the physical properties of the resin extrusion molded product 1, resulting in bonding strength. It is also strong and has little deformation.

[Effects of the Invention] The present invention described above reduces the end of the resin extrusion molded product 1 by the thickness numerator so that the thickness of the injection molded part 2 to be bonded thereon becomes uniform along its outer shape. By cutting to shape and size, the appearance of the injection molded part 2 is improved, the defect rate is reduced, cycle time is significantly reduced, high-speed injection is possible, joint strength is increased, and deformation is reduced. This has the effect of reducing

[Brief explanation of the drawing]

Figures 1 to 3 show the end portion of a resin extrusion molded product according to an embodiment of the present invention. Figure 1 is a front view showing the cut shape, and Figure 2 is the right side of Figure 1. 3 are sectional views taken along the line AA in FIG. 1. Figures 4 to 6 show the state in which the injection molded part is joined to the end of the resin extrusion molded product shown in Figures 1 to 3. Figure 4 is a front view, and Figure 5 is a front view. The right side view of Figure 6 is the BB sectional view of Figure 4, and Figure 7 is
The figure is a sectional view taken along the line CC in FIG. 4. 1 Extrusion molded product 1a Shrinkage cut part 2 Injection molded part molecule Injection molded part thickness patent Applicant Agent Nishikawa Rubber Industries Co., Ltd.
Person Patent Attorney Furu 1) Kei Tsuyoshi Figure 1 Figure 1 & Figure 3 Figure 2 Figure 5 Figure 7

Claims (1)

[Scope of Claims] In the method of cutting the end of the resin extrusion molded product when joining the injection molded part to the end of the resin extrusion molded product, the method comprises: Terminal processing of a resin extrusion molded product, characterized by cutting the end of the resin extrusion molded product into a shape and size that are reduced by the thickness of the injection molded part so as to form an injection molded part of uniform thickness. Method.