JPS5816743A - End face forming method of pipe material - Google Patents

Abstract

PURPOSE:To heat and soften an end part of a pipe material, and to form it to an object shape, by rotating a metallic pipe material at a high speed, and making a heat resisting sintered carbide material contact by pressure with its end face. CONSTITUTION:A metallic pipe material 14 is fit-stuck to a rotary part 3 through a collet chuck 2 and supported, and a heat resisting sintered carbide material 15 for working is inserted into a groove 7 provided on an operation part 4 so that it is positioned at the side of the pipe material 14. Subsequently, the pipe material 14 is rotated at a high speed of 3000rpm by a rotation of a rotary part 1, the heat resisting sintered carbide material 15 is turned around an operating shaft 5, and its side is contacted by pressure to the end part of the rotating pipe material 14. The end part of the pipe material 14 is red-heated and softened by friction against the heat resisting sintered carbide material 15, and can be deformed and worked to a desired shape. The end part of the pipe material is choked in a short time without using other material for the end part, and its shape can also be worked freely.

Description

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

BACKGROUND ART Conventionally, when closing the end face of a metal pipe, a method has been implemented in which another metal member is welded to the end face of the pipe.

When using this conventional method, a good appearance cannot be obtained unless the welded part is cut and polished after welding.
Processing takes a long time, requires labor, and has high manufacturing costs.

Additionally, there has been a method of cutting a separate member onto the end face of a metal tube material, but this method 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 methods for forming end faces of metal pipes and materials as described above, and to eliminate the need for separate members.
A novel method for forming end faces of metal tubes that has sufficient strength, can be processed in an extremely short time, reduces the labor required for processing, reduces manufacturing costs, and provides a good appearance. Our goal is to provide the following.

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

First, I will explain the end face forming device according to Fig. 1.
Reference numeral 1 denotes a rotating part of the apparatus, on which a collet chuck 2 for attaching a metal tube 14 is attached. 3 is the receiving RF tongue of the device installed at the lower front of the rotating part 1,
The lower surface of the operating portion 4 is in sliding contact with the left side of the upper surface of the operating section 4.

5 is an operating shaft that passes through the operating section 4 and protrudes from the base 3;
Reference numeral 6 denotes a lever protruding from the left side surface of the operating section, and by moving this lever 6, the operating section 4 is rotated about the operating shaft 5. Reference numeral 7 denotes a groove formed in the upper right side surface of the operating section 4, and a buffer material 8 is inserted into the groove 7 together with a heat-resistant carbide material 15. Reference numeral 9 denotes a port screwed onto the upper surface of the operating section 4, and a cushioning material 8
It is designed to press against the top surface of the

1O is a support stand provided on the right side of the upper surface of the stand 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 for setting the pipe material 14 and the anti-skid hard material 15 in the end face forming apparatus as described above will be explained with reference to FIGS. 1 and 2.

1. First, the tube material 14 is passed through the collet chuck 2 to the rotating part 3.
The collet chuck 2 is fitted and supported, and protrudes from the end surface of the collet chuck 2. The amount of protrusion of the tube 14 is set so that the distance @L (mm) from the center of the operating shaft 5 to the end surface of the tube 14 is 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) in the jar, first, the arbor 13 is rotated around the arm shaft 12, and the arbor 13 is tilted toward the tube member 14 so that the lower surface of the arbor 13 comes into contact with the upper surface of the jar 11. Thereafter, the tube 14 may be made to protrude until its end surface comes into contact with the side surface of the aperture 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 is fixed by the port 9 via the cushioning material 8. As a result, the heat-resistant carbide material 15 becomes rotatable around the operating shaft 5 as the lever 6 is operated. Then, the heat-resistant carbide material 15 is 1ll1 side 15
When a becomes parallel to the tube material 14, it is set with a gap g (mm) provided between the tube material 14 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 tube material 14 is always rotated.
It is preferable to set one end surface 15b of the heat-resistant carbide material 15 to be positioned slightly to the right of the end surface of the tube material 14 so that the side surface 15a of the heat-resistant carbide material 15 comes into contact with the end surface of the tube material 14. Furthermore, the length of the four surfaces 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.

The 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 with an outer diameter of 22 (m") and an inner diameter of 20 (mm). The carbide materials 15 include heat-resistant steel, super heat-resistant alloys, etc. that are resistant to oxidation at high temperatures, can withstand high stress at high temperatures for long periods of time,
It is better to select a pellet-shaped material that also has excellent wear resistance. The distance F is approximately 16 mm, which is the length of F) required to close the end surface of the tube member 14 into a spherical shape, and the gap f is set within 1 mm.

Now, as shown in FIG. 3(a), after setting the tube material 14 and the heat-resistant carbide material 15, the tube material 14 is moved by the rotating part l of the device to approximately 300 Or-p-ml! Rotate at high speed at l:. From this state, move the heat-resistant carbide material 15 around the operating shaft 5.
When rotated counterclockwise, the side 15a of the heat-resistant carbide material 15 comes into contact with the end of the tube 14, as shown in FIG. 3(b). 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.

While rotating the tube material 14 at high speed, the heat-resistant carbide material 15 is further heated.
When rotated counterclockwise, the end of the tube material 14 touches the side surface 15a of the heat-resistant carbide material 15, as shown in FIG. 3(C).
After passing through the state shown in FIG. 3(d), the end surface of the tube material 14 is formed into a spherical shape and closed as shown in FIG. 3(e). When the heat-resistant carbide material 15 is rotated 90 degrees counterclockwise from the position shown in FIG. 3(a) as shown in FIG. 3(f), the tip of the tube material 14 is exposed to frictional heat. The end surface of the tube member 14, which was initially open, is now completely spherical and closed.

Further, the heat-resistant carbide material 15 is rotated clockwise from the state shown in FIG. 3(f) to a position where its side surface 15a is parallel to the pipe material 14 with a gap f as shown in FIG. 3(g). Return to 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, the radius R-11 (mm)
(R is the outer radius of the tube material 14, g is the gap) in a spherical shape,
This method is extremely suitable for mass production because the end face of the tube material 14 can be formed in just a few seconds.

Further, if the gap f is narrowed, it becomes approximately hemispherical, and on the other hand, if the gap hy is widened, it is formed approximately planar as shown in FIG. 4. If the distance is set short, the end surface of the tube member 14 can be formed into an open spherical shape as shown in FIG. Furthermore, in the first step, as shown in Figure 3 ((3)
If it is formed into a tapered shape as shown in FIG. 6 and then closed in a planar shape in the second step, it is also possible to obtain the shape shown in FIG. 6.

In addition, in order to form a sharply curved surface as shown in Fig. 7,
This is possible 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 tube material 14 is not limited to approximately 3000 rpm, but the tube material 14 may be rotated at a speed sufficient to generate sufficient frictional heat to deform the tube material 14.
The rotation speed should be set appropriately depending on the material, outer and inner diameter, etc. Furthermore, if the shape of the side surface 15a of the heat-resistant carbide material 150 is curved and the locus drawn by the side surface 15a is numerically controlled by a microcomputer or the like, the end surface of the tube material 14 can be shaped into a gourd shape, for example, as shown in FIG. It is possible to deform and process it into various shapes such as. Furthermore, it goes without saying that the process can be automated.

Effects As detailed above, this invention deforms the end surface of the tube by pressing and frictionally heating the end surface of the tube by pressing a heat-resistant carbide material into pressure contact with the end surface of the tube while rotating the metal tube at high speed. Since it is machined, the end face of the pipe material can be integrally formed without the need for a separate member, and the strength is sufficient, and it can be processed in an extremely short time, reducing the labor required for processing. At the same time, the manufacturing cost is reduced and a good appearance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an end face forming apparatus for a method of forming an end face of a pipe material embodying the present invention, Fig. 2 is a cross-sectional view showing a method of setting a pipe material and heat-resistant carbide material, and Fig. 3 is an end face forming process. FIGS. 4 to 8 are cross-sectional views showing various end shapes.

Claims (1)

[Claims] l The end surface of the metal tube (14) is made by pressing the heat-resistant carbide material (15) into contact with the end surface of the tube (14) while rotating the metal tube (14) at high speed. A method for forming an end face of a pipe material, characterized by deforming the part by m, rfE and frictional heating. 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.