JPS5922645B2 - Manufacturing method of synthetic resin deformed long material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method for rolling-molding a deformed elongated synthetic resin material, which prevents deformation such as warping or bending of a molded product and imparts linearity to the molded product. This is the purpose.

Conventionally, plastic irregularly shaped long materials with various cross-sectional shapes are manufactured by attaching a die having an opening approximately equal to the cross section of the irregularly shaped long material to the extrusion port of an extrusion molding machine, and extruding and cooling molten resin. ing.

However, since the melt viscosity of the resin, shrinkage during solidification, surface tension of the molten resin, etc. are related to the cross-sectional accuracy of the molded product, it is very difficult to complete the die to obtain the desired irregularly shaped long material. It was necessary to repeat many tests. Moreover, depending on the plastic, it is virtually impossible to apply conventional methods to some plastics due to problems such as thermal deterioration and thermal decomposition. As an improvement to solve these problems, a long material with a relatively simple cross-section such as a square or round material, or a long material with a relatively simple cross-section such as a square or round material, or It has been proposed that the so-called cold rolling method, in which a material having roughly the same shape as the molded product is passed through a mold at a temperature below the melting point of the material, can be applied to many plastics. However, a particular problem in rolling deformation of irregularly shaped plastic long materials is that it is practically impossible to roll and deform the entire irregularly shaped part uniformly, resulting in differences in deformation in some parts. This causes deformation such as warpage or bending in the shape of the molded product, and the linearity of the molded product deteriorates. In particular, if a difference in circumferential speed occurs on the rolling roll surface that makes up the cross-sectional shape of the product, the difference in circumferential speed will cause a difference in deformation during rolling, resulting in a straight line of the product. sex becomes very bad. As a result of various studies on such problems during rolling processing, the inventors of the present invention discovered that the difference in circumferential speeds between opposing rolling roll surfaces that form the target molded product can be made in opposite directions and approximately equal. As a result, the inventors discovered that it is possible to obtain an irregularly shaped elongated material without deformation such as warping or bending, and arrived at the present invention.

That is, the present invention provides a rolling forming apparatus for a synthetic resin profile material that rolls an open part (a part forming a recess in the cross section of the profile material) and a part other than the open part of the profile material. A rolling roll surface that rotates with a circumferential speed difference and has a convex part, and a rolling roll surface that rotates with a circumferential speed difference that rolls a part adjacent to the open part of a deformed material. a first rolling roll having a
and rolling the part of the profile opposite the bottom of the open part;
a combination of rolls forming a concave shape, the first roll having a roll surface that does not produce a difference in circumferential speed, and a second roll having the same axis as the first roll; The axial center of the rolling roll forming the convex portion and the axial center of the rolling roll having the convex portion are arranged in parallel with each other facing the rolling roll surface that does not cause a circumferential speed difference of the second rolling roll. Therefore, when performing roll forming, the maximum circumferential speed on the rolling roll surface that causes a circumferential speed difference of the rolling roll having the convex portion, and the rolling roll surface that causes the circumferential speed difference of the first rolling roll. This is a method for producing a synthetic resin deformed elongated material, characterized in that rolling is carried out with the maximum circumferential speed on the rolling roll surface of the second rolling roll being approximately equal to the maximum circumferential speed on the rolling roll surface of the second rolling roll.

In the present invention, the rolling roll is a roll for regulating the cross-sectional shape of the molded product and rolling it, and the material is a material having a harder hardness than that of the rolled product, and metal is usually used.
Moreover, the rolling roll surface refers to the portion where the rolling roll is in contact with the molded product. Hereinafter, the present invention will be explained with reference to the drawings.
FIGS. 1 and 2 are schematic cross-sectional views of an apparatus for illustrating a conventional forming method using rolling rolls. In FIG. 1, roll 2', roll 45, roll 5'. and roll 3'
The rolling process is carried out at approximately the same circumferential speed on the 3'c plane.

However, the part to roll 3/, 3, and roll 3
′, 3 also cause warping and bending of the molded product due to differences in circumferential speed within the same plane.In the example shown in FIG. The rolling process is carried out with the circumferential speed of the c section and the 5' c section of the roll 5' being approximately the same.
3r and 3 are also the rolling amount caused by the circumferential speed difference in the same plane at the part 5' and the rolling 1 caused by the circumferential speed difference in the same plane at the part 5' and 5'b of the rolls. A difference occurs in the molded product 1', causing warping and bending of the molded product 1'.

3-4 are schematic cross-sectional views of an apparatus illustrating an embodiment of the invention.

In Figures 3 and 4, rolls 2 and 4 are first rolling rolls having rolling roll surfaces 2a and 4b that rotate with a circumferential speed difference, adjacent to the open part of the profiled material, with the axis 13 as the axis. The roll 5 is a second rolling roll having the same axis 13 as the first rolling roll and having a rolling roll surface 5c that does not cause a difference in circumferential speed, facing the open part of the profiled material. be.

These first and second rolling rolls constitute a rolling roll having a recess for rolling the molded product 1.
In addition, the roll 3 has the open part of the profiled material with 12 as the axis,
This is a rolling roll having a convex portion and having rolling roll surfaces 3a and 3b that rotate with a difference in circumferential speed. Here, axis 1
2 and 13 are opposite to the rolling roll surface 5c of the mouth roll 5,
arranged in parallel. Then, the maximum circumferential speed of the rolls 2 and 4 on the roll surfaces 2a and 4b, where the difference in circumferential speed is occurring, and the maximum circumferential speed of the roll 3, on the roll surfaces 3a and 3b, where the difference in circumferential speed is occurring, are determined. The circumferential speed of the rolling roll surface 5c is approximately equal to that of the rolling surface 5c. That is,
In FIG. 3, rolling roll surface 5c, rolling roll surface 3
The circumferential speeds at the portions c, 10, and 11 are made approximately equal. By adjusting the circumferential speed in this manner, the circumferential speed differences between the surfaces 3a and 2a, and between the surfaces 3b and 4b are opposite to each other relative to the molded product 1 and are approximately equal. In the embodiment shown in FIGS. 3 and 4, each rolling roll is forcibly driven to adjust its circumferential speed as described above.

Further, in the embodiment shown in FIG.
and 5 are forcibly driven to make the circumferential speeds on the rolling roll surfaces 3c and 5c almost equal, and the rolls 2 and 4 are freely driven. That is, the rolls 2 and 4 rotate under the influence of the movement of the molded product 1 advanced by the rolls 3 and 5, and if the resin flow is negligible, the rolls 2 and 4 rotate. The maximum peripheral speed on the roll surfaces 2a, 4b is approximately equal to the maximum peripheral speed on the roll surfaces 3a, 3b of the roll 3, that is, the peripheral speed on the roll surface 3c. In addition, roll 2
, 3, 4, and 5 are naturally in the same direction as the direction of movement of the molded product. Further, the present invention is not limited to the embodiments shown in the drawings, but can be applied to irregularly shaped long materials having various cross-sectional shapes. Furthermore, regarding the driving of one rolling roll, depending on the shape of the molded product, it may be sufficient to drive at least one rolling roll under strong control, as long as the effects of the present invention are not impaired. Furthermore, the present invention can be applied to molding thermoplastic resins such as polyethylene, polypropylene, polyacetal, polystyrene, polyvinyl chloride, polycarbonate, polyamide, polyester, or thermosetting resins with a low degree of crosslinking. Further, it is also possible to use these resins mixed with various fillers. Here, the filler may be fibrous, spherical, etc., organic, inorganic, or polymeric, and may also be surface-treated. By molding an irregularly shaped long material of synthetic resin, it is possible to obtain a molded product with a desired cross-sectional shape without warping or bending, and it is possible to obtain an irregularly shaped long material with good straightness. can.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views showing a general rolling processing apparatus for irregularly shaped long materials, and FIGS. 3 to 5 are schematic cross-sectional views showing a manufacturing apparatus of the present invention. 1, 1'...molded product, 2, 2', 3, 3', 4, 4'
5, 5'... Roll roll, 6, 7, 8, 9... Power transmission device, 12, 13... Axial center, 2a, 3a, 3b
To 3c, 4b, 5c, 3, 3'B, 3'C, 5r, 5 is also 5/c...roll surface.

Claims (1)

[Claims] 1. In a rolling forming machine for synthetic resin shaped materials, which rolls open parts of synthetic resin shaped materials (portions forming recesses in the cross section of the shaped material) and parts other than the open parts, the open parts of the shaped materials are rolled. , a first roll having a roll surface that rotates with a circumferential speed difference and having a convex portion, and a first roll having a roll surface that rotates with a circumferential speed difference, which rolls a portion adjacent to the open part of the deformed material; and a second rolling roll that rolls the portion facing the bottom of the open portion of the profiled material, has a rolling roll surface that does not produce a difference in circumferential speed, and has the same axis as the first rolling roll. and a combination of rolling rolls forming a concave shape, the axis of the rolling roll forming the concave shape and the axis of the rolling roll having the convex portion being set to the second rolling roll. When rolling forming is performed using a device arranged parallel to a roll surface that does not produce a difference in circumferential speed, the maximum circumference of the roll roll having the convex portion on the surface of the roll that causes a difference in circumferential speed. Rolling is performed by making the speed, the maximum circumferential speed on the rolling roll surface causing the difference in the circumferential speed of the first rolling roll, and the circumferential speed on the rolling roll surface of the second rolling roll approximately equal. A method for manufacturing a synthetic resin deformed long material.