JPS60206526A - Manufacture of decorative square tube - Google Patents

Abstract

PURPOSE:To obtain a square tube having a specularly finished face and applicable for high-class decoration by forming a round tube finished by surface polishing to square shape while protecting it by a shrink tube and then stripping off the protecting tube, and passing said tube through buffing rolls. CONSTITUTION:A round tube A, polished and surface finished beforehand is covered with a material (shrink tube) 11 such as PVC, that can be shrunk by heat of about 60 deg.C, and then stuck firmly to the surface of the tube A by warming to a temperature higher than above-mentioned temperature. Then, the tube A convered with the material 11 is sent to a square forming section 30 and formed to a square tube A1 by pressure forming by press rollers 21, 22 from above and below and left and right. Then, the square tube A1 is sent to a pack stripping section 30 and the material 11 is tore and stripped by a knife 32 having an edge 32a. The tube A1 from which the material 11 is stripped off is passed through a roll group made up of plural sets of puffing rolls 41, 42 provided above and below, and right and left to buff-finish the face of the tube A. Then, small flaws are removed and an objective decorative square tube is obtained.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing square tubes used for decoration.

Conventionally, when square tubes are used for decoration, they are polished back and forth along their length, so it is common for the surface to have so-called hairlines, creating a sophisticated decoration. No one with a gloss for use was manufactured.

In view of the above, an object of the present invention is to provide a method for manufacturing a square tube that can be used for high-grade decoration.

In order to achieve the above object, the present invention has a structure in which a round steel tube A, which has been subjected to finishing eT polishing in advance, is packed in a shrink tube 11, and then press rollers 21, 22 are placed from the top, bottom, right and left.
The pack is then peeled off, and finally the rectangular tube A1 passes between buff ink rolls 41 and 421f provided above, below, left and right with respect to the plane.

The present invention will be described below based on an embodiment shown in the drawings.

In the present invention, a round steel tube is pre-polished to a mirror finish and then molded into a square shape. 10, vinyl chloride, etc., 60
It is covered with a material (shrink tube) 11 that can be contracted by heat of about 0.degree. C. (FIG. 1). The round tube A coated with this shrink tube 11 has a diameter of at least 60'
It is immersed in a blanching tank (not shown) in which hot water c is stored. As a result, the tube 11 is shrunk into a round tube A.
Pack it in close contact with the surface. Round tube A in this state
is sent to the next molding process.

As shown in the second figure, this molding process is divided into a square forming part 20, a pack peeling part 30, and a puff part 40 in order from the upstream side in the feeding direction of the tube.

That is, the square forming mold section 30 is provided with at least two sets of press rollers 21 and 22 that press and form the round tube A from above and below, and from left and right, as shown in the third figure.

By this pressure forming, the round tube AI′i, the square tube A with a square cross section
1. Next, this square tube A1 is sent to the pack peeling section 30. As shown in FIG. 4, the core part 30 is provided with guide rollers 31 on the upstream side in the tube feeding direction for holding the protective tube from above and below to maintain the pack posture of the shrink tube 11, and on the downstream side thereof. A blade part B2a that faces upstream of the pipe and diagonally maintains a slight gap with the upper surface of the pipe in order to bite into the gap between the pack and the square pipe work A and cut and peel off the upper part of the pack. A knife 32 with a handle is installed. A protective member 83 made of nylon or the like with a triangular cross section is attached to the back side of the blade part 82a to protect the finished surface by securing a gap between the blade part 82a and the square pipe A. There is.

The puff part 40 puff-finishes the flat surface of the square pipe by passing the bare pipe A work between the roll groups consisting of multiple sets of buffing glows/L'41 and 42 provided on the top and bottom, left and right sides. and remove small scratches.

As described above, the present invention polishes the surface of the round tube, protects it with a shrink tube, and shapes it into a square shape. Therefore, it could not be obtained using the traditional method. A decorative one-sided square tube with a mirror-finished surface was obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing the shrink tube installation process according to an embodiment of the present invention, FIG. 2 is a side view of the shrink tube forming process, and FIG. 3 is a cross-sectional view 4 of FIG. The figure is an enlarged perspective view of the pack peeling section. A...Round EI1 pipe, A type...Square pipe, 10...Shrink tube attachment part, 11...Shrink tube, 20...Square forming mold part, 21...Upper and lower press rollers, 22... ... Left and right press rollers, 30... Pack peeling section, 31... Guide roller, 32... Knife, 83.
...protective material, 40...puff part, 41...top and bottom buffing rolls, 42...left and right buffing rolls Patent applicant Nissin Steel Co., Ltd. agent Swordsman Shinpei Inukai 6

Claims (1)

[Claims] After the round steel tube A, which has been finish-polished in advance, is packed in a shrink tube 11, it is squared by press rollers 21 and 22 from the top, bottom, left and right, the pack is peeled off, and finally the square tube A1 is Buff ink rolls 41 are provided above, below, left and right with respect to the plane.
A method for manufacturing a decorative square tube, characterized in that the tube passes between 42 groups.