JPH0225690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD This invention relates to a method of forming an end face of a metal tube.

Prior Art Conventionally, when closing the end face of a metal pipe,
A method has been practiced in which another metal member is welded to the end face of the pipe material. When using this conventional method, a good appearance cannot be obtained unless the welded part is cut and polished after welding, and the processing time is long, labor is required, and manufacturing costs are high. It was hot.

Furthermore, a method of fitting a separate member to the end face of a metal tube has conventionally existed, but this requires time to process the separate member and lacks strength because it cannot be formed integrally.

Purpose The purpose of the present invention is to eliminate the drawbacks of the conventional end face forming method for metal pipe materials as described above, and to provide a method that does not require separate members, has sufficient strength, and can be processed in an extremely short time. It is an object of the present invention to provide a novel method for forming an end face of a metal tube material, which reduces labor required for processing, reduces manufacturing costs, and provides a good appearance.

EXAMPLE Hereinafter, a method for forming an end face of a tube material embodying the present invention will be described with reference to the drawings.

First, the end face forming apparatus will be described with reference to FIG. 1. Reference numeral 1 denotes a rotating part of the apparatus, into which a collect chuck 2 for attaching a metal tube 14 is fitted. Reference numeral 3 denotes a device cradle provided at the lower front side of the rotating part 1, and the lower surface of the operating part 4 is in sliding contact with the upper left side of the cradle 3. Reference numeral 5 denotes an operating shaft that extends through the operating section 4 and protrudes from the cradle 3. Reference numeral 6 indicates a lever that projects from the left side of the operating section.By moving this lever 6, the operating section 4 is operated. It is adapted to rotate around an axis 5. 7 is a groove formed on the upper right side of the operating section 4,
A buffer material 8 is inserted into the groove 7 together with a heat-resistant carbide material 15 . Numeral 9 is a bolt screwed onto the upper surface of the operating section 4 and is configured to press against the upper surface of the cushioning material 8.

Reference numeral 10 denotes a support stand provided on the right side of the upper surface of the cradle 3, and a pin 11 is protruded from the left side of the upper surface. Reference numeral 12 denotes an arm shaft fitted into the upper right side of the support base 10, and rotatably supports the arbor 13 on the support base 10. Note that it is convenient to use a lathe as the end face forming device.

Next, a method of setting the tube material 14 and the heat-resistant carbide material 15 in the end face forming apparatus as described above will be explained with reference to FIGS. 1 and 2.

First, the tube 14 is fitted and supported on the rotating part 3 via the collector chuck 2, and is made to protrude from the end surface of the collector chuck 2. The amount of protrusion of the tube material 14 is the same as that of the operating shaft 5.
The distance L (mm) from the center of the tube member 14 to the end surface of the tube member 14 is set to be a predetermined length. At this time, it is assumed that the center of the operating shaft 5 is located directly below the axis of the tube member 14. To set the distance L (mm), first rotate the arbor 13 around the arm shaft 12 and tilt it toward the tube 14 so that the lower surface of the arbor 13 contacts the upper surface of the pin 11. Thereafter, the tube 14 may be made to protrude until its end surface abuts the side surface of the arbor 13.

Next, the heat-resistant carbide material 15 is inserted into the groove 7 of the operating part 4 so as to be located on the side of the tube member 14, and fixed with the bolt 9 via the buffer material 8. As a result, the heat-resistant carbide material 15 becomes rotatable around the operating shaft 5 as the lever 6 is operated. The heat-resistant carbide material 15 has a planar side surface 1.
When 5a becomes parallel to the tube material 14, it is set with a gap g (mm) between it and the tube material 14.

In addition, in FIG. 2, when the heat-resistant carbide material 15 is rotated counterclockwise around the operating shaft 5, the side surface 15a of the heat-resistant carbide material 15 is always brought into contact with the end surface of the tube member 14. It is preferable to set one end surface 15b of the heat-resistant carbide material 15 to be located slightly to the right of the end surface of the tube material 14. Further, the length of the side surface 15a is determined so that the other end surface 15c of the heat-resistant carbide material 15 is located to the left of the center of the operating shaft 5.

A method of forming a spherical closed end face of the tube material 14 set as described above will be described with reference to FIG. 3. The tube material 14 is made of mild steel and has an outer diameter of 22 (mm) and an inner diameter of 20 (mm). As the heat-resistant carbide material 15, it is preferable to select a pellet-like material such as heat-resistant steel or super heat-resistant alloy that is resistant to oxidation at high temperatures, can withstand high stress at high temperatures for a long time, and has excellent wear resistance. The distance L is the tube material 1
A predetermined length (approximately 16 mm) and a gap g required to form a spherical closed end surface of 4 are set to within 1 mm.

Now, as shown in FIG. 3a, after the tube material 14 and the heat-resistant carbide material 15 are set, the tube material 14 is rotated at a high speed of about 3000 r.p.m. by the rotating section 1 of the apparatus. When the heat-resistant carbide material 15 is rotated counterclockwise around the operating shaft 5 from this state, the side surface 15a of the heat-resistant carbide material 15 comes into contact with the end of the tube material 14, as shown in FIG. 3b. . At this time, the end of the tube material 14 becomes red-hot and softened due to friction with the heat-resistant carbide material 15, but the heat-resistant carbide material 15 does not become red-hot even at high temperatures and is not welded to the tube material 14.

When the heat-resistant carbide material 15 is further rotated counterclockwise while rotating the tube material 14 at high speed, the third
As shown in FIG. 3c, the end of the tube 14 is deformed by pressure on the side surface 15a of the heat-resistant carbide material 15, and after passing through the state shown in FIG. 3d, the tube 14
The end surface of the tube is closed while being formed into a spherical shape. When the heat-resistant carbide material 15 is rotated 90 degrees counterclockwise from the position shown in FIG. 3a as shown in FIG. 3f, the tip of the tube 14 is welded by frictional heat, and the tube The end face of 14 was initially open, but is now completely spherical and closed.

Furthermore, from the state shown in FIG. 3 f, the heat-resistant carbide material 1
5 in the clockwise direction, and return it to a position where its side surface 15a is parallel to the tube member 14 with a gap g, as shown in FIG. 3g. Then, the high-speed rotation of the tube material 14 is stopped, and the tube material 14 is naturally cooled.

When using the method of the above embodiment, radius R+g
This method is extremely suitable for mass production because the end face of the tube 14 can be formed into a spherical shape of [mm] (R is the outer radius of the tube 14, and g is the gap) in just a few seconds.

Further, if the gap g is made narrower, it becomes approximately hemispherical, and on the other hand, if the gap g is made wider, it is formed into an approximately planar shape as shown in FIG. If the distance L is set short, the pipe material 1 as shown in FIG.
The end face of 4 can also be formed into an open spherical shape.
Furthermore, if it is formed into a tapered shape as shown in FIG. 3c in the first step and closed in a planar shape in the second step, it is also possible to form the shape as shown in FIG. 6. Furthermore, forming the tube into a sharply curved shape as shown in FIG. 7 can be achieved by shifting the operating shaft 5, which was located directly below the axis of the tube 14, to the right from the state shown in FIG.

It should be noted that the present invention is not limited to the method of the above-described embodiments, but can also be made as described below. For example, the tube material 14 is not limited to mild steel, and may be made of brass, aluminum, or other metal materials. The high speed rotation speed of the pipe material 14 is approximately 3000prm
However, the rotational speed should be set to an appropriate speed depending on the material, outer and inner diameter, etc. of the tube 14 so as to generate sufficient frictional heat to deform the tube 14. Furthermore, it goes without saying that the process can be automated.

Effects As described in detail above, the present invention rotates a metal tube material at high speed while rotating an operating shaft which is located closer to the proximal end than the end surface portion of the tube material and is perpendicular to the axis of the tube material. By contacting the flat side surface of the heat-resistant carbide material, which is rotated around the center, the end surface of the pipe material is pressurized and heated by friction to deform it, so there is no need for separate parts. It is possible to form the end face of the pipe material with sufficient strength, it can be processed in an extremely short time, the labor required for processing is reduced, the manufacturing cost is reduced, and a good appearance is obtained. Moreover, it can be deformed into various shapes by changing the length from the center of the operating shaft, which is the center of rotation, to the side of the heat-resistant carbide material, or the distance from the center of the operating shaft to the end surface of the pipe material. It has the excellent effect of being able to

[Brief explanation of drawings]

Fig. 1 is a front view showing an end face forming apparatus of a method for forming an end face of a pipe material embodying the present invention, and Fig. 2 is a cross-sectional view showing a method of setting a pipe material and a heat-resistant carbide material.
Figure 3 is a cross-sectional view showing the process of forming the end face, Figures 4-
FIG. 7 is a sectional view showing various end face shapes. Rotating part...1, Operating shaft...5, Piping material...14,
Heat-resistant carbide material...15, side...15a, distance...
...L, gap...g, outer radius...R.

Claims (1)

[Scope of Claims] 1. While rotating the metal tube 14 at high speed, an operation is performed on the end surface of the tube 14 to be processed, which is located closer to the proximal end than the end surface and perpendicular to the axis of the tube 14. This tube material is characterized in that the end surface of the tube material 14 is deformed by pressurizing and frictionally heating the end surface portion of the tube material 14 by contacting the planar side surface 15a of the heat-resistant carbide material 15 which is rotated around the shaft 5. End face formation method. 2. The method for forming an end surface of a tube material according to claim 1, wherein the end surface portion of the tube material 14 is formed to be closed.