JPS59161214A - Method of cutting moulding - Google Patents

Abstract

PURPOSE:To carry out the cutting of a moulding material on vibration marks generated in the moulding material at constant pitches so that the exterior appearance of a moulding formed by the cutting may be made satisfactory, by setting the length of the moulding material from the outlet of an extrusion mould to a cutting edge, to a distance which is an integer times as large as the cut length of the moulding. CONSTITUTION:A moulding material M1 is cooled down in a cooling tank 2, and is cut in a predetermined length (1) by a cutter 4 after being extracted by an extractor 3, so that a moulding body M is obtained. The setting of the cut length (1) of the moudling body M is made by adjusting the distance from a cutting edge 41 to a imit switch LS1. With this arrangement, a slide base 43 is made movable along a rail 44 so that the distance L between the outlet of an extrusion mould 1 and the cutting edge 41 may be adjusted. Further, the distance L is set to a value which is an integer times as large as the cut length (1), upon cutting. Thereby, the cutting may be made on marks which are formed in the moulding material M1 at constant pitches due to vibration generated upon cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a molding, and particularly to a method for cutting a long molding body that is continuously extruded by extrusion molding.

Conventionally, moldings to be attached to body panels of automobiles and the like have been manufactured by the method shown in FIG.

In the same figure, Ml is a flat metal strip material? 4
A metal molding material obtained by molding into a fixed cross-sectional shape using a roll forming machine for one hour.The material M1 is passed through a synthetic resin extrusion mold 1 to form at least the outer surface of the metal molding material M1. After the resin is integrally applied, it is cooled in a cooling tank 2, and then transferred to a belt-type pulling machine 3.
The molding M is then continuously taken up by the cutting machine 4 and cut into a predetermined length l by the cutting machine 4. The cutting machine 4 includes a cutting blade 41, a traveling cutting die 42 that holds the cutting blade 41,
Fixed to arm 45, Mitsutswitch L Sl,
Consists of LSL. The traveling cutting die 42 moves on the slide base 43 at the same speed as the molding body M when the limit switch LSL is activated. The cutting blade 41 cuts the molding body M when the limit switch LS2 is activated.

The cutting operation is performed as follows. i.e. traveling cutting 'J
i-42Jy) When the tip of the molding M is fixed at a distance l from the cutting blade 41 or when the tip of the molding M contacts the Misoto Inch LSi, the traveling cutting die 42 is moved at the same speed as the molding body M using an air cylinder (not shown) or the like. Subsequently, the traveling cutting die 42 and the molding body M travel by α, and when the tip of the molding body M comes into contact with the limit switch L 32, a cutting command is sent to the cutting blade 41 to perform cutting. Next, the traveling cutting type 42
moves back to its original position and repeats the same action. Therefore, the cutting length l of the molding body M is adjusted by adjusting the position from the cutting blade 41 to the limit switch LS. The reason why the cutting blade 41 is moved at the same speed as the molding body M is that when the molding body M, which is continuously fed during cutting, is stopped,
This is because the molding body M extruded from the extrusion mold 1 is bent and deformed, and the cut surface is not good.

When the moving speed of the molding body M is slow, the cutting blade 41
There is no need to move the limit switch LS, and the limit switch LS can be disconnected when activated. At this time, α is zero.

However, according to the conventional cutting method, fLH and vibration when the cutting blade 41 cuts the molding body M are transmitted through the molding body M to the molding body M in the extrusion process, and the second As shown in the figure, very slight vibration marks X, However, there was an inconvenience in that the appearance was significantly impaired.

The purpose of the present invention is to cut the molding body M at the position of the vibration mark that is generated by a certain pinch on the surface of the molding body, thereby preventing vibration marks from being formed on the cut molding. An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a simplified configuration diagram showing an embodiment of the molding cutting method according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. In this case, the slide base 43 is placed on the rail 44 so as to be movable and adjustable along the longitudinal direction of the molding body M, and is fixed to the rail 44 by a locking mechanism 46 . By being able to move the slide base 43 in this way, the distance between the exit of the extrusion mold 1 and the cutting blade 41 can be adjusted freely. In the present invention, L is set to satisfy the following formula % (n: integer, l: cutting length, α: moving distance of the blade, and is set to 0 if the moving speed of the molding body M is slow.) It is set. This results in
The cutting point coincides with the vibrating manicure gate, and the cut molding will not be crushed. Here, the cutting length p is
For example, a case where the number is set to 800 will be explained. The distance α is constant (100 mm). I! = 800
When making a crane, the distance between the extrusion mold 1 and the cutting blade 41 is 3.90
Move the slide base 43 on the rail 44 so that the position is 0mm" and lock it at the 3.900+am position. When this happens, the tip of the molding body M comes into contact with the trigger switch LSL, and the traveling cutting die 42 moves the molding body. When the tip of the molding body M contacts the limit switch L Sz and issues a cutting signal after moving at the same speed as the molding body M, the distance between the cutting blade 41 and the extrusion port becomes 4.0001 m. has reached
The value is exactly 5 times the cutting length of 800m+m. If this is repeated thereafter, the cutting blade 41 will always cut on the vibration mark. When the moving speed of the molding body M is relatively slow, the limit switch L3z may be omitted and the limit switch LSt may be used to immediately disconnect. At this time, α becomes zero. Note that in the present invention, the position detector is not limited to a limit switch, but may also be a phototube.

A proximity switch or the like may be used, or a timer or the like may be used to detect the position of the limit switch LS1 and then issue a command signal for disconnection after a certain period of time (after moving by α).

[Brief explanation of the drawing]

1 and 2 are a simplified configuration diagram and a perspective view showing an example of a conventional molding cutting method, and FIG. 3 is a simplified configuration diagram showing an example of a molding cutting method according to the present invention. 1... Extrusion mold, 2... Cooling tank, 4... Cutting machine,
41... Cutting blade, 42... Traveling cutting type, 43...
Slide base, 44...rail. Patent applicant: Hashimoto Forming Industry Co., Ltd.

Claims (1)

[Claims] The molding material is passed through a synthetic resin extrusion mold to coat at least a part of the outer surface of the molding material with the synthetic resin, and then passed through a cutting blade to cut the molding material into a predetermined length β. A method for cutting a molding, characterized in that the distance from the exit of the extrusion mold to the cutting blade is set to a value that is an integral multiple of the cutting length l. .