JPS6391222A - Manufacture of molding - Google Patents

Abstract

PURPOSE:To manufacture efficiently a long-sized molding whose cross-sectional form has been changed without making use of an injection molding machine, by cutting off a part of a synthetic resin molded part by a copy control cutter synchronously with extrusion molding. CONSTITUTION:A core material is sent into an extrusion mold 24, extrusion molding is performed by supplying synthetic resin, an upper lip 6 and lower lip 7 made of the synthetic resin are formed and they are unified with the core material 5. Then a command is issued from a control equipment 26 according to a sending-out quantity of the core material 5, cutting-off equipment 27 is moved like M N and a part of the upper lip 6 is cut off by a cutter 32. The same is taken off continuously by a taking-off machine 29 while cooling by a cooling tank 28 and a molding 2 is obtained by cutting off the same in a fixed lengths by a cutting machine 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a long molding for a vehicle having a synthetic resin part, and particularly to a molding in which the cross-sectional shape of the synthetic resin part changes.

[Conventional technology]

FIG. 8 is a perspective view of a vehicle, where 1 is a vehicle body, and a drip molding 2, a window molding 3, etc. are used as long moldings having synthetic resin parts. For example, in drip molding 2, these moldings include a pillar part 2a and a corner part 2.
b. In the roof part 2C, and also in the window molding 3, in the side part 3a, corner part 3b, and upper part 3C, the cross-sectional shape of the synthetic resin part may change.

FIG. 9 is a front view of the drip molding, and FIG. 10 is a perspective view of a portion thereof. The drip molding 2 has a pillar part 2a with a length of Ql, a corner part 2b with a length of P2, and a roof part 2C with a length of Q3, and synthetic resin is used at both upper and lower ends of a core material 5 that forms a metallic bright surface 4 over its entire length. An upper lip 6 and a lower lip 7 are formed as parts. The core material 5 serves as the molding body, is made of a deformed metal plate, and has approximately the same cross-sectional shape over its entire length. The lower lip 7 also has almost the same cross-sectional shape, but the upper lip 6 has a wide constant width at the pillar part 2a, gradually narrows at the corner part 2b, and becomes a narrow constant width at the roof part 2C, and has a different cross-sectional shape. is changing.

The conventional manufacturing method for moldings having a synthetic resin part whose cross-sectional shape changes is to insert a core material formed into a predetermined shape by roll molding into an injection mold, and then fix the resin part by injection molding. There is a way.

[Problems to be solved]

However, in such conventional manufacturing methods,
Since an injection mold is used to form the entire long molding, there are problems such as the manufacturing equipment becomes large, the work process is complicated, and work efficiency is poor.

This invention was made in order to solve the above-mentioned problems. It is possible to manufacture long moldings with changing cross-sectional shapes by extrusion molding, which simplifies the manufacturing equipment and work process, and improves work efficiency. The purpose of this study is to propose a manufacturing method for moldings that can increase the

[Means for solving problems]

This invention includes a step of forming an extrusion molded product having substantially the same cross-sectional shape by extrusion molding of a synthetic resin, and a process in which the cross-sectional shape of the synthetic resin part changes in synchronization with the extrusion of the extrusion molded product. This method of manufacturing a molding includes the steps of: and cutting a synthetic resin part. In the present invention, the synthetic pine resin includes rubber.

[For production]

In the molding manufacturing method of the present invention, first, a molten resin is supplied to an extrusion mold and extrusion molding is performed to form an extruded molded product having substantially the same cross-sectional shape.

Then, in synchronization with the extrusion of the extrusion molded product, a part of the synthetic resin part is cut to produce a molding in which the cross-sectional shape of the synthetic resin part changes.

In such a molding manufacturing method, a molding in which the cross-sectional shape of the synthetic resin part changes can be obtained by simply cutting the synthetic resin part after extrusion molding, thereby eliminating the need for injection molding, and thus requiring manufacturing equipment and The process is simplified and moldings can be manufactured efficiently.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Fig. 1 is a system diagram showing the manufacturing method of the embodiment, Fig. 2 is a front view of the cutting device, Fig. 3 is a sectional view taken along line A-A, and Fig. 4 is a diagram showing the relationship between the feed amount and the cutter movement amount. .

In the manufacturing method of the molding 2 shown in FIGS. 9 and 10, a metal strip material 12 such as a stainless steel plate is fed out from an uncoiler 11 and sent out by a pinch roller 13. On the other hand, the protective tape 15 is sent out from the roll 14, and is applied by the application roll 16 to the portion of the strip material 12 that will eventually form the metallic bright surface 4. Thereafter, the surface is cleaned in a sanding section 17 or the like, coated with an adhesive using a roll coater 18, and baked in a baking section 19. The composite material 21 cooled in the cooling tank 20 is bent and formed into a predetermined cross-sectional shape using a roll forming machine 22 or the like.
A core material 5 that will become the molding body is formed. The core material 5 is fed into the extrusion die 24 while the feed amount is detected by a feed amount detection device 23 such as a rotary encoder. On the other hand, extrusion molding is performed by supplying molten synthetic resin to the extrusion mold 24,
An upper lip 6 and a lower lip 7 as synthetic resin parts are formed and integrated with the core material 5. In this way, an extrusion molded article 25 having substantially the same cross-sectional shape as the pillar portion 2a of FIG. 10 is formed. Next, according to a command from the control device 26 according to the amount of core material 5 delivered, a part of the upper lip 6 is cut in a cutting device 27 so that the cross-sectional shape of the upper lip 6 changes, and then cooled in a cooling tank 28. Pick-up machine 2
The molding 2 is obtained by taking it over at 9 and cutting it into a certain size using a cutting machine 30.

The cutting device 27 includes a support die 31 that supports the extrusion molded product 25 extruded from the extrusion die 24, and a cutter 32 consisting of a roller cutter arranged opposite to the support die 31.
, this cutter 32 is connected to the combination spring 33
It consists of a slider 34 that is moved in the MN direction via a servomotor 35, a threaded rod 36 and a guide bar 37 that move the slider 34 by a servo motor 35, and bearings 38 and 39 that support these. The servo motor 35 is connected to the control device 26 and rotates in forward and reverse directions according to commands according to a preprogrammed program, thereby moving the cutter 32 in the MN direction via the slider 34.

As shown in FIGS. 9 and 10, the molding 2
The length of the pillar part 2a is Ω1. If the length of the corner part 2b is ``29'' and the length of the roof part 2c is Q3, the relationship between the feeding amount (length) of the core material 5 and the moving amount of the cutter 32 is as shown in Figure 4. That is, in the part of Ω1 corresponding to the pillar part 2a, the cutter 32 moves in the M direction by the forward rotation of the servo motor 35, and performs extrusion molding while being separated from the upper lip 6. Corner part 2b
When the portion Q2 corresponding to is detected, the servo motor 35 rotates in reverse according to a command from the control device 26, thereby gradually moving the cutter 32 in the N direction to cut a part of the upper lip 6, and cut the upper lip 6 in sequence. Expand your breadth. And in the part 2Q3 corresponding to the roof part 2c, the servo motor 3
5 is stopped, cutting is performed at the maximum cutting width, and the cut portion 6a is removed. Next, at I12 part, servo motor 35
The cutter 32 rotates in the forward direction and reduces the cutting width by the operation opposite to the above, and in the subsequent 2Q1 portion, the cutter 32 stops cutting when it is separated from the upper lip 6. Then, according to a command from the control device 26, the cutting machine 30 performs cutting at the center of the portions 2Q and 2Q, thereby obtaining the molding 2.

5 to 7 show other embodiments. In FIG. 5, as the cutter 32, a plate-shaped cutter having a sharp edge at the tip is arranged at the outlet of the extrusion die 24 and moved in the PQ force direction. The cutting width of the upper lip 6 is changed. In FIG. 6, as the cutter 32, a cutter having an arc-shaped blade is arranged movably in the R8 direction, and the upper lip 6 is
The cut surface is curved. In FIG. 7, a shaping roller 40 is arranged after the cutter 32, and moves in the TU force direction in conjunction with the movement of the cutter 32 in the MN, PQ, and R8 directions. It is designed to shape rough cut surfaces.

In the above explanation, the upper lip 6 is cut by the cutter 32 in the Q2. Q.

It may be done only for the Q□ section, but it may also be done with a narrow width for the Q□ section. Further, instead of detecting the amount of the core material 5 delivered, the amount of the extruded product 25 delivered may be detected, and cutting may be controlled based on this.

The present invention is not limited to the drip molding 2, but can be similarly applied to the manufacture of window moldings 3 and other moldings having elongated synthetic resin parts.

〔,Effect of the invention〕

According to the present invention, since the synthetic resin part is cut in synchronization with extrusion molding, a long molding in which the cross-sectional shape of the synthetic resin part changes can be manufactured by extrusion molding. Equipment and processes can be simplified,
Efficiency can be improved and productivity can be increased.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the manufacturing method of the embodiment, Fig. 2 is a front view of the cutting device, Fig. 3 is a sectional view taken along line A-A, Fig. 4 is a diagram showing the relationship between the feed amount and cutter movement amount, and Fig. 5 to 7 show other embodiments, in which FIG. 5 is a front view of the cutting device, FIG. 6 is a perspective view, FIG. 7 is a sectional view, FIG. 8 is a perspective view of the vehicle surface, and FIG. The figure is a front view of the molding, and FIG. 10 is a perspective view of a part thereof. In each figure, the same reference numerals indicate the same or corresponding parts, 2.3
1 is a molding, 5 is a core material, 6 is an upper lip, 12 is a metal strip material, 15 is a protective tape, 22 is a roll forming machine, 23 is a delivery amount detection device, 24 is an extrusion mold, 27 is a cutting device, 31 is a support A die, 32 a cutter, 34 a slider, 35 a servo motor, and 40 a shaping roller.

Claims (3)

[Claims] (1) A step of forming an extrusion molded product having substantially the same cross-sectional shape by extrusion molding of a synthetic resin, and a step in which the cross-sectional shape of the synthetic resin part changes in synchronization with the extrusion of the extrusion molded product. A method for manufacturing a molding, including a step of cutting a synthetic resin part. (2) The manufacturing method according to claim 1, wherein the synthetic resin portion is cut immediately after extrusion molding. (3) The manufacturing method according to claim 1 or 2, wherein the synthetic resin portion is cut in accordance with the amount of feed of the core material to be integrated into the extrusion molded material.