JPS59163030A - Working method of pipe end - Google Patents

Abstract

PURPOSE:To work and form exactly the end part of a pipe in a short time by crushing the end part of a pipe to be attached by butt welding to the side face of a pipe frame by a die having the shape conforming to said side face. CONSTITUTION:A pipe 3 is clamped onto a stationary plate 2 of a press machine in the case of attaching the end part of the pipe 3 by butt welding into a T shape to the side face of the other pipe frame 20. On the other hand, a die 10 which is formed with a curved surface 10a having the side face shape of the frame 20 on the front surface and is projected with a core part 10b having approximately the same diameter as the inside diameter of the pipe 3 at the center is attached to a slide block 7. The block 7 is slid toward the end face of the pipe 3 to insert the part 10b into the pipe 3 and to press the part 10a to the end part of the pipe 3, thereby crusing the end part. The end part of the pipe 3 is so formed as to coincide with the side face shape of the frame 20 by such pressing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe end processing method for processing the end of a pipe as a front collar when butt welding the end of the pipe to the side surface of another pipe frame in a T-shape.

For example, when manufacturing a chair with a pipe frame structure,
There are cases where the end of the pipe is butt welded to the side of the pipe frame in a T-shape, but in such cases conventionally the first
As shown in the figure, the end part a of the pipe was trimmed to match the shape of the side surface of the pipe frame.

However, it is difficult to perform the trimming process accurately, and it is impossible to perfectly match the side shape of the pipe frame to which the end of the pipe is joined. A gap appears in the
For this reason, sufficient welding strength could not be obtained, and furthermore, particles and molten metal entered the pipe through this gap, causing problems such as producing abnormal noise in the product.

This invention was made in order to solve the above-mentioned four points, and it is possible to easily process and form the end of the pipe in accordance with the side shape of the pipe frame to which it is to be joined, and in a short time. It is an object of the present invention to provide a tube end processing method that can perform good welding without creating a gap between surfaces. To achieve this objective, the present invention involves pressing a mold having the side profile of a pipe frame for butt-welding the ends of the pipe onto the end of the pipe, and dipping the end. The summary is as follows.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a front view of the processing section in the press machine, showing the state in which the end of the vibrator has been crushed. 2 is a fixed plate, a fixed plate! On top, a holder block 3 on which the processed product vibrator 3 is placed, a stopper 5 located on the right side of the holder block and abutting the end of the vibrator 3, and a heel block B at the left end i are fixed. 7 is a fixed plate on the left side of the holder block Hiro! It is a slide block that fits into the left and right sides at the top, and has an inclined surface on the top left that comes into contact with the cam surface of the cam blocker, which will be described later, and between it and the holder block. A compression coil spring is installed.

It is a mold provided at the front part of the 10-port slide block 7, that is, facing the vibe 3 held by the holder block. As shown in FIG. Curved surface part with side shape / O(1
, is formed on the front surface, and a core part /' (7b) with a diameter that is approximately the same as the inner diameter of the vibrator 3 is protruded from the center of the curved surface part ioa. At the time of ti, the upper die for reinforcing support is removed.

12 is a movable plate fixed to the lower end of the ram/3 of the press machine, and two guide blocks i are installed at the bottom of the movable plate/2.
a, is and the cam block 9 are fixed, and a crank bronck/B is fitted between the guide blocks /Il and /S so as to be vertically slidable. The lower part of the clamp block/B is formed in a concave shape so as to press and clamp the vibrator 3 on the holder block l from above, and a lower mold/7 for reinforcing and supporting the vibrator 3 during molding is attached to its left end. The cam block 961 is positioned so as to slide along the l+11'' surface of the heel block B, and during machining, its cam surface comes into contact with the inclined surface of the slide block 7 and descends, causing a slide (toff L:
The lug 19 that pushes the I-kook 7 to the right is a compression coil spring interposed between the clamp block/B and the lower part of the movable platen/2.

With the processing apparatus having such a configuration, the pipe end processing method of the vibrator 3 is carried out as follows.

First, in the state where the movable platen 2 is raised, that is, the slide block 7 is at the left end tLfL, and the clamp block 7 is separated upward from the rudder block t.
The vibrator 3 is placed at a fixed position on the holder block l.

When the movable platen /2 is lowered by the operation of the press machine, first, the clamp block /B clamps the vibrator 3 on the holder block l, presses it against the compression coil spring /9 via /9, and the cam block As the slide block 7 descends, the slide block 7 is pushed and moved to the left. At this time, the core portion 10b is inserted into the inside of the mold 10-piece vibrator 3, and the curved surface portion 10α is pushed past the end of the vibrator 3 to crush it. Then, by such a press DIJ process, the end of the tube 3 is formed so as to match the shape of the Il1 surface B of the pipe frame 20 to be joined.

! The vibrator 3, whose IM part has been soaked and processed by a press, is then welded to the IMu &lS of the pipe frame 20 in a T-shape in the next step, but at this time, the joint surfaces abut without any gaps, and the meat Since it is raised to form a flange, welding can be performed satisfactorily with sufficient strength.

As explained above, according to the pipe end processing method of the present invention, the end of the vibrator is crushed using a mold that has the side shape of the pipe frame to be joined. The molding process can be easily performed in a short time to accurately match the shape, and the welding can be performed without creating a gap on the joint surface of the vibrator, so that good welding with sufficient welding strength can be performed. In addition, compared to conventional trimming processing, there is no problem such as the processed part becoming stiff or molten metal entering the vibrator, such as making abnormal noises on the surface of the product.

[Brief explanation of drawings]

Fig. 1 is a front view of a vibrator whose σ end has been processed by conventional trimming processing, Fig. 2 is a front view of a processing section of a press machine that implements the method of this invention, and Fig. 3 is a front view of a mold and a vibrator in the same processing section. FIG. 1I is a perspective view of the processed vibrator, FIG. S is a front view thereof, and FIG. 6 is a perspective view of the vibrator and the pipe frame joined together. 3...Pipe, 10...Metal, lOa curved part 10b
...Core, +29...Nokubu frame. Patent application Hito Co., Ltd., Shininumemoto Spring Manufacturing Co., Ltd. Figure 1 Figure 5

Claims (1)

[Claims] A method for butt welding the end of a pipe to the side surface of a pipe frame, in which the end of the pipe is clamped on the fixed plate of the pipe frame, and the end of the pipe is welded to match the shape of the side surface of the pipe frame. A method for making a pipe end 1jI, characterized in that a mold having the side surface shape is pushed onto the end of the pipe to crush the end.