JPS60199629A - Manufacture of molding with uneven width - Google Patents

Abstract

PURPOSE:To enable the application of extrusion molding excellent in the productivity by sliding split body forming dies mutually at a fixed speed in the direction of tentering in linkage with the proceding of extrusion working for a resin side molding for an automobile. CONSTITUTION:In linkage with extrusion of an extrusion molding machine, first and second body molding dies 1 and 2 are slid by alpha in the direction (a) to expand the width of a molding 3 with an uneven width from W to W+2alpha. When they are slid by alpha separately in the direction (b), the width of the molding 3 with an uneven width changes from W+2alpha to W. Here, the width (w) of mount bolt head engaging groove 3b shifts at a fixed rate. In this manner, the first and second body forming dies 1 and 2 is made to interlock the extrusion action at a proper cycle and then, cutting the resulting semi-finished product 5 at cutting lines A produces a number of moldings with an uneven width in a given size at a time.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a molding of unequal width to be mounted on an automobile, and more specifically, a method of manufacturing a molding of unequal width that is integrally formed with a groove for retaining a bolt head by extrusion molding. Relating to a method of manufacturing.

(Prior Art) For example, as shown in FIG. 4, an unequal width molding includes a side molding 22 made of resin that is attached to a side portion 21 of an automobile 20, and enhances the design effect of the automobile 20.

Therefore, in order to manufacture such unequal width moldings,
Conventionally, FIG. 5(a) is produced by injection molding.

As shown in FIG. 6(b), a molding 22a of unequal width in which the mounting bolts 23 are embedded integrally can be obtained, or by injection molding using a slide core, as shown in FIGS.
) As shown, a method of obtaining a molding 22b of unequal width that integrally has the engaging portion 24 of the mounting port 23 is generally adopted. However, with the above example methods,
Separate and independent molds are required for vehicle fenders, front doors, rear doors, quarter parts, etc., which raises the problem of increased mold manufacturing costs and product costs. Furthermore, each of the above methods also has the problem that it takes time to set up, etc., making it impossible to increase productivity as desired.

(Object of the Invention) In view of the above-mentioned problems of the prior art, the present invention provides a method for manufacturing unequal width moldings that enables the application of extrusion molding with excellent productivity and thereby greatly contributes to reducing product costs. aim to provide.

(Structure of the Invention) The above object is to align a two-part main body mold with a groove mold for forming a groove for engaging a mounting bolt head, and to interlock the two main body molds with each other in conjunction with the progress of extrusion. This is achieved by a method of manufacturing a molding of unequal width in which the molding is slid at a constant speed in the width direction.

(Example) Hereinafter, an uninvented example will be described based on the accompanying drawings.

FIGS. 1(a) and 1(b) show the structure of a mold for performing water splashing. In the figure, 1 is a first main body molding die, 2 is a second main body molding die, and both work together to mold the main body part 3 of the unequal width molding 3. 4 is a groove mold, and a groove 3b for retaining the mounting bolt head, which will be described later.
It becomes something that molds.

Therefore, the above-mentioned molds are incorporated into an extrusion molding machine (not shown) and used for extrusion molding, which will be described later.
At this time, the first main body mold 1 and the second main body mold 2 are slidable relative to the groove mold 4 and mutually slidable in the rll extension direction (a or b direction in the figure). can be incorporated in a movable manner.

In order to mold the unequal width molding 3 with such a mold structure, the first main body mold l and the second main body mold 2 are respectively moved in conjunction with the appropriate progress of the extrusion operation of the extrusion molding machine. If the unequal width molding 3 is slid by α in the direction a, the width of the main body of the unequal width molding 3 will change from the initial W to W+2α.
At this time, the width W of the mounting port head engaging groove 3b remains constant (see FIGS. 1(a) and 1(b)). In addition, for extrusion operation, the first main body mold l and the second main body mold 2 are mutually
If it is slid by α in the direction, unequal width molding 3
The width of the main body portion 3a varies from W+2α to W.

Here, for the extrusion operation, the first main mold l and the second
If the book and mold 2 are linked in an appropriate cycle,
As shown in FIG. 2, an intermediate product 5 having unequal widths is obtained, and by cutting the intermediate product 5 along cutting line A, a large number of moldings with unequal widths of a predetermined size can be obtained at once. You will be able to do it.

Then, the unequal width molding 3 obtained as above
As shown in FIG. 3, a mounting bolt 23 is installed using the groove 3b, and using this mounting bolt 23, the unequal width molding 3 is mounted on the above-mentioned automobile 20. becomes.

(Effects of the Invention) As described above in detail, the present invention aligns a two-part main body mold with a groove mold, and interlocks the width of the two main body molds with each other in conjunction with the progress of extrusion molding. Since it was possible to manufacture moldings of unequal width by extrusion molding by sliding at a constant speed in the exit direction, the productivity was significantly improved and the product cost was reduced.

In addition, it has become possible to arbitrarily set the degree of unequal width and length, and it has also been possible to manufacture moldings with unequal widths with a high degree of freedom in terms of design.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are sectional views showing the structure of a mold for carrying out the method of the present invention, Figure 2 is a schematic diagram showing an example of an intermediate product obtained by water droplet, and Figure 3 is a A perspective view showing the external shape of the unequal width molding obtained by water splashing, Figure 4 is a schematic diagram showing how the unequal width molding is installed in a car, and Figures 5 (a) and (b) are conventional manufacturing methods. A perspective view and a front view showing an example of unequal width molding, Fig. 6 (
Figures a) and (b) are a perspective view and a front view showing another example of an unequal molding made by a conventional manufacturing method. 1.2・φ・Body mold 4 ...Groove mold Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 1 25 Fig. 26 (Q) (b) Procedural amendment (method) Person making the amendment and case % Fraudulent applicant name (320)) Yota Motor Co., Ltd. 5. Date of amendment order: June 6, 1980 (Shipping date: June 26, 1988) 7. Contents of amendment (1) Specification No. Page 3, line 14, “Figure 1 (a), (
b) Correct J to "Figure 1". (2) Book Ming+a, page 4, line 16 [(Figure 1 (a)
, (b) Correct the reference to "(See Figure 1 @)". (3) Line 7 of the detailed declaration [Figure 1 (a), (b) is corrected to "Figure 1". (4) Figure 1 of the drawings is amended to the accompanying drawings. & Attached 4F catalog drawing (Fig. 1) 1 copy Fig. 1 60

Claims (1)

[Claims] (1) A main body mold consisting of two parts is aligned with a groove mold, and the two main body molds are slid against each other at a constant speed in the width direction in accordance with the progress of extrusion molding. How to make equal width moldings.