JPS59161215A - Method of cutting moulding - Google Patents

Abstract

PURPOSE:To make the appearance of a moulding satisfactory after being cut, by setting the moving distance of a cutting edge such that marks which are produced at constant pitches in a moulding material due to vibration upon cutting, appear at positions having a distance therebetween 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 (l) 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 (l) of the moulding body M is made by adjusting the distance from a cutting edge 41 to a limit switch LS1. In this arrangement, a limit switch LS2 is arranged movably on an horizontal arm 46 attached on a arm 45 so that the distance alpha between limit switches LS1, LS2 or the moving distance of the cutting edge 41 may be made adjustable. Further, the above-mentioned distance alpha is set to satisfy the following condition, alpha=nl-L where n is an integer, and L is a distance from the outlet of an extrusion mould 1 to the cutting edge.

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 figure, Ml is a metal molding material obtained by forming a flat metal strip material into a constant cross-sectional shape using a cold roll forming machine, and this material M1
is passed through a synthetic resin extrusion mold 1 to integrally coat at least the outer surface of the metal molding material M1 with resin, and then cooled in a cooling tank 2 and continuously processed by a belt-type take-up machine 3. Then, the molding M is obtained by cutting it into a predetermined length l using a cutting machine 4. The cutting machine 4 has a cutting blade 4
1, a traveling cutting die 42 that holds this cutting blade 41, and limit switches LSi, LSz fixed to an arm 45.
It consists of The above travel cutting type 42 is a limit switch L
When Ss is activated, it moves on the slide base 43 at the same speed as the molding body M. The cutting blade 41 cuts the molding body M when the limit switch LS is activated.

The cutting operation is performed as follows. That is, traveling cutting type 4
When the tip of the molding M comes into contact with the limit switch LSI fixed at a distance β from the cutting blade 41 of No. 2, the traveling cutting die 42 is moved at the same speed as the moving speed of the molding body M using an air cylinder or the like (not shown). Then, the traveling cutting die 42 and the molding body M travel by α, and the tip of the molding body M comes into contact with the limit switch LS, and at that time, a cutting command is sent to the cutting blade 41 to perform cutting. Next, the traveling cutting die 42 retreats back to its original position and repeats the same operation. 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 Ls1. The reason why the cutting blade 41 is moved at the same speed as the molding body M is because when the molding body M, which is continuously fed during cutting, is stopped, the molding body M extruded from the extrusion mold 1 is bent. This is because the cut surface is not good, 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 LS1 (it can be disconnected when the limit switch LS1 is activated. At this time, α is zero.

However, according to the conventional cutting method, the shock 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, There was an inconvenience that the appearance was significantly damaged.

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, thereby eliminating the above-mentioned drawbacks. An embodiment of the present invention will be described below in detail based on 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 denoted by the same reference numerals. In this case, the arm 45 is provided with a horizontal arm 46, and a limit switch L32 is provided on this horizontal arm 46 so as to be movable along the longitudinal direction of the molding body M.
'S2 is fixed by a fixing means not shown. According to such a configuration, the distance α between the limit switches LS and LS2, that is, the moving distance of the cutting blade 41 can be adjusted. The settings are as follows.

tx=nl! -L (However, n!!≧L) Note that n is an integer! is the cutting length, and L is the distance from the exit of the extrusion mold 1 to the cutting blade 41.

By setting τ in this manner, the vibration mark M is generated at a position having a length that is an integral multiple of the cutting length l, and the position of the vibration mark M can be cut. Here, to explain the case where the cutting length p is set to, for example, zoomm, n is set to 7
If the distance is 5,00011 rA, then α is 600 mm from the above formula, and if α is 600 mm, then
When the cutting blade 41 operates and performs a cutting operation, a vibration mark is generated, and a vibration mark X is generated at the seventh cutting from the time of the above-mentioned cutting.

A molding that is cut at the X position and has a length of 80011 Im can be manufactured. In addition, in the present invention, the position detector is not limited to a limit switch, but a phototube or a proximity switch may be used.Also, a timer or the like may be used to detect the position with the Rimisoto Sui Nochi LSq, and after a certain period of time (α The command signal for disconnection may be issued after the robot has moved for a certain amount of time.

[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. DESCRIPTION OF SYMBOLS 1... Extrusion mold, 2... Cooling tank, 4... Cutting machine, 41... Cutting blade, 42... Running cutter, ゛New model, 4
3...Slide base, 46...Arm.

Claims (1)

[Claims] A detector detects the tip of a molding body, which is formed by extruding a molding material from a synthetic resin extrusion die and coating at least a part of the outer surface of the molding material with a synthetic resin, after passing through a cutting blade. In a molding cutting method in which the cutting blade is moved in the moving direction of the molding body by a distance α at the same speed as the molding body at the time of this detection, and the cutting blade is operated to cut the molding, the distance α is as follows. A method for cutting a molding, characterized in that the method is set to satisfy the formula. Note that n is an integer,
l is the distance between the cutting blade and the detector, and L is the distance between the exit of the extrusion mold and the cutting blade. α=nI! , -L (however, nl≧L).