JPS63101596A - Manufacture of pipe bending-section loop side protector - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a manufacturing method applied to inner protectors of pipes, tubes, etc., and supports attached to bent portions of pipes.

BACKGROUND OF THE INVENTION The conventional bending process for manufacturing an abdominal protector is shown in FIG. 6 as follows: 1) A specified pipe is bent to a specified bending radius using a pipe bender. 2) This is cut with a saw to the original dimensions.

3) This is further subjected to gas cutting or plasma cutting in the longitudinal direction.

The abdominal protector was manufactured using the above steps.

C. Problems to be Solved by the Invention In the conventional method for manufacturing a ventral protector, it is necessary to use a pipe bender to bend a pipe (diameter D) to a predetermined dimension (bending radius R). A predetermined gripping allowance is required even when bending pipe Ben-R and above, but in the case of the ventral protector, the gripping allowance is short, so as shown in Figure 7 (1) After sawing the straight pipe to the specified size, ( 2) It is difficult to perform a bending process with a predetermined bending radius, and (3) to perform gas cutting or plasma cutting in the longitudinal direction. For this reason, as shown in FIG. 6, the tube has to be continuously cut with a predetermined bending radius, which means that it is currently taking a long time to cut the original dimensions and cut with a saw in the subsequent process. Further, although longitudinal cutting is performed after cutting to the original dimensions, since the cutting direction is the length of the curved line, saw cutting is not possible, so gas cutting or plasma cutting is unavoidably performed.

For this reason, as shown in FIG. 6, after being cut in the longitudinal direction, one side becomes unusable and is disposed of as scrap due to the influence of the width and cut edge of gas cutting or plasma cutting. Therefore, the current situation is that materials are being used extremely wastefully.

2. Means for Solving the Problems In order to solve the above problems, in this invention, as shown in Fig. 1, when bending a half pipe using a pipe bender, as shown in Fig. 2, A round bar or tube whose outer diameter is the inner diameter of the protector is embedded in a semicircular groove in the conventional clamp die 2 and pressure die 3 to form a convex clamp die 4 and a convex pressure die 5, and the half pipe is made into a bender. After inserting and clamping the half tube, we bent it to the target H as a means to solve the problem.

E. When bending a half pipe using a pipe bender, as shown in Fig. 2, a convex clamp die 4 and a convex clamp die in which a round bar or tube whose outer diameter is the inner diameter of the protector are embedded in a semicircular groove. Insert the half tube into the bender using pressure die 5, clamp the half tube, and then wrap the half tube around the bending die.
A ventral protector bent to the desired radius can be obtained.

Embodiment The bending jig tool for the half pipe used as the material for the layer protector is a bending die l clamp die 2 as shown in Fig. 1.
It is composed of pressure die 3. The clamp die 2 and the pressure die 3 are as shown in Fig. 2. (The clamp die and the pressure die used in the conventional Pengu are used to attach a predetermined pipe to the clamp die and the pressure die. A pipe whose outer diameter is the inner diameter of the half pipe is welded or bolted.) ) and a convex clamp die and convex pressure die manufactured by machining.

As shown in FIG. 3, the half tube 7 is placed against a bending die 1 and fixed with a convex clamp die 4. Next, the convex pressure die 5 is applied to the half pipe 7. When the bending die 1 is rotated in this state, the half tube 7 is bent so as to be wrapped around the bending die 1 while being pushed by the pressure die 5, thereby forming the ventral side protector 6. With the establishment of this half-tube bending method, manufacturing inferiority of the ventral side protector of the tube bending area has been reduced to 4th.
As shown in the diagram, the steps are (1) cutting the straight pipe material into short pipes, (2) sawing the short pipes into longitudinal half pipes, and (3) bending the half pipes using a cold draw pen. became.

Effects of the invention By implementing the invention, the following remarkable effects can be achieved.

1) With the establishment of a pipe bending method using pipe bending, bending can be performed even at bending radii of (2D)-R or less, which was previously impossible.

2) By using the process shown in Figure 4, it is now possible to cut with a saw, which previously took a long time, and to make effective use of parts that could not be used. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the half pipe bending jig of the present invention, Fig. 2 is a perspective view of a convex clamp die and a convex pressure die that utilize conventional clamp dies and pressure dies, and Fig. 3
The figure is a drawing of the half tube bending process, Fig. 4 is a drawing of the ventral protector manufacturing process, Fig. 5 is a drawing of the ventral protector, Fig. 6 is a drawing of the conventional protector manufacturing process, (X) is the bending process (b) Original drawing dimension saw cutting, (C) is a diagram showing various steps of longitudinal cutting, Figure 7 is a diagram showing the conventional difficult manufacturing process, (a) is a straight pipe g
It is a diagram showing various steps of cutting jA+J5, (b) short tube bending, and (C) circumferential and longitudinal cutting. Explanation of symbols: 1@...bending die, 2Φ/Φ clamp die, 3...-pressure die, 4...convex clamp die, 5...convex pressure die, 6...fist belly side protector , 7 fists...Half-split pipe, 8-Red plain pipe, 9...Scrap, replacement...
...Gripping fee. Figure 1A-A11'rrjoB-BI! [1 Figure 3 Figure 4 (G) (b)] (C) => (Moxibustion

Claims (1)

[Claims] In the method of cutting a pipe to a predetermined length, dividing the cut pipe in half in the longitudinal direction, and bending the ventral protector 6 into half pipes using a cold draw bender, a semicircular groove is formed. A tube bending section characterized in that the tube half is held by a concave bending die 1 having a concave bending die 1 and a convex clamp die 2, and the tube half is wrapped around the bending die using a convex pressure 5. How to make a ventral protector