JPS6372431A - Preparation of protecter on back side of pipe bending section - Google Patents

Abstract

PURPOSE:To shorten the preparation time of a protecter at the back side of a pipe bending section by bisecting a pipe in a longitudinal direction and bending it by a cold drawing bender. CONSTITUTION:A pipe is cut by a saw in the prescribed length and the bisected pipe 4 bisecting the cut pipe in the longitudinal direction is fixed by a clamp 2 to a projection bending die 1. A pressure 3 is applied on the bisected pipe 4. When a pipe bender is rotated, the bisected pipe 4 is wound on the projection bending die 1 and the back side protecter is manufactured. The manufacturing time is thus shortened and the member throwing the half of the pipe away in the past is effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method for manufacturing a protector for the outside of a bent portion of a pipe, tube, etc., and supports to be attached to a bent portion of a tube.

Conventional technology The conventional dorsal protector for the pipe bending section is shown in Figure 6.

(a) A predetermined pipe 7 is bent at a predetermined bending radius using a pipe bender.

(b) Saw the length to the original dimensions.

(C) Gas cutting or plasma cutting in the longitudinal direction.

It is manufactured through various manufacturing processes.

8. Problems to be Solved by the Invention In the conventional manufacturing process for dorsal protectors, it is necessary to use a pipe bender to bend the pipe to predetermined dimensions. When bending with a pipe bender, a certain gripping allowance is required due to the structure of the machine, but in the case of the back protector, the gripping allowance is short, as shown in Figure 7 (a). After cutting with a saw, (b) bending the pipe with a predetermined bending radius, and (C) cutting the pipe with a predetermined bending radius, as it is difficult to perform gas cutting or plasma cutting in the longitudinal direction, as shown in Figure 6. The actual situation is that continuous cutting is required with a bending radius of , and it takes time to saw to the original dimensions in the subsequent process.

Also, after cutting the original dimensions, longitudinal cutting is performed, but since the cutting direction is the longitudinal direction of the curve, it is not possible to cut into a curved shape with ζ (), so gas cutting or plasma cutting is unavoidably performed. Therefore, as shown in FIG. 6, after being cut in the longitudinal direction, one side becomes unusable due to the effect of gas cutting or plasma cutting, and is disposed of as scrap 8, resulting in a great deal of waste.

2. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has invented a convex bending mold for half pipes that can be mounted, and a mechanism for wrapping the pipe of the pipe bender with this convex bending mold. As a means to solve the problem, the dorsal side protector is formed by combining the half tubes and wrapping them around a convex bent mold.

E. Operation FIG. 3 provides a detailed explanation of the present invention. The half tube 4 is fixed to the convex bending die 1 with a clamp 2. Apply pressure 3 to the half tube. When the pipe bender is turned, the mechanism that wraps the tube around the pipe bends the halved tube into a convex bent shape to create a dorsal protector.

EXAMPLE The present invention will be described in detail in FIG. The convex bending mold is as shown in Fig. 2 (Fig. 1), or it can be manufactured by machining. A convex bending mold (Fig. 2) is made.
By using this half-pipe bending jig, as described in the section of the above-mentioned function, (a) sawing a straight pipe into short pipes, (b) cutting the short pipe in half with a saw, as described in the section of the function above. (C) Bending the half tube using a cold draw pen.

The production method has been completed.

Effects of the Invention By implementing the present invention, the following remarkable effects could be achieved.

l) Changes in the manufacturing process were established and the work time was significantly shortened.

2) It is now possible to effectively utilize parts that previously had half of the tube thrown away.

[Brief explanation of the drawing]

Figure 1 shows the cold draw pen bending jig and tool of the present invention.
The figure shows the convex bending mold of the present invention, Figure 3 is a diagram of the half-tube bending process of the present invention, and Figure 4 is a diagram of the manufacturing process of the dorsal side protector of the present invention. b) is firstborn half saw cutting;
(C) shows the cold draw pengu bending process, Figure 5 is an external view of the dorsal protector, and Figure 6 is a diagram of the conventional manufacturing process, where (a) is the bending process, and (b) is saw cutting to the original dimensions. ,
(C) is longitudinal cutting, Figure 7 is a manufacturing process diagram that is difficult to implement in the past, (a) is straight pipe saw cutting, (b) is short pipe bending,
(c) is a diagram showing longitudinal cutting. Explanation of symbols: l...Convex bending type, lasφ/convex part, 2...Clamp, 3e...Pressure, 4...Half pipe, 5...
・Conventional bending die for pipe bending, 6φφ・back protector,
71・Pipe, 8・φ jar scrap.

Claims (1)

[Claims] 1. A method for manufacturing a back side protector for a bent tube portion, which comprises sawing a tube into a predetermined length, halving the cut tube in the longitudinal direction, and bending the tube with a cold draw bender.