JPS5938052B2 - pipe processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe processing device that is most suitable for rounding the tip of a pipe having an appropriate hardness, such as a metal pipe.

As a conventional method for rounding the tip of a metal pipe, for example, there is a method described in Japanese Patent Publication No. 49-9955.

In this method, in the first step, the tip of the metal pipe is first cut into a V-shape, and in the second step, the tip is narrowed, thereby rounding the tip of the metal pipe. However, this method not only requires a large number of steps and is inefficient, but also tends to create a gap at the tip of the rounded pipe due to the V-shaped cut, resulting in a poor finish.

The present invention was invented to correct the above-mentioned defects, and includes a pair of molds that are pressed against each other. A pair of substantially oval-shaped recesses are formed to face each other, and each of these recesses has a substantially semicircular arc or a parabolic outline on the opposing surface side and side surface side, respectively. At least one of the molds is provided with a cutting blade that protrudes along the contour line of the opposing surface, and the pipe is pressurized from both sides by both concave portions of both molds to simultaneously round the pipe. This relates to a pipe processing device in which the outer periphery of the rounded portion is cut by a blade.

With this configuration, the number of machining steps can be halved compared to the conventional method, and a beautiful finish can be obtained. An embodiment in which the present invention is applied to a metal pipe processing apparatus will be described below with reference to the drawings.

As shown in FIG. 1, this device uses a lower mold 1, an upper mold 2, and a metal pipe position regulating frame 3.

The lower mold 1 and the position regulating frames 3 arranged at predetermined intervals on the lower mold 1 are each fixed on a base (not shown),
The upper mold 2 is configured to be able to be raised and lowered by a conventionally known pressurizing lifting device (not shown). Both molds 1 and 2 are provided with a pair of substantially oval-shaped recesses 4 which are open on two surfaces, respectively, of the opposing surfaces 1a and 2a and the lateral surfaces Ib and 2b on the side of the position regulating frame 3; 5 are formed in a husband-and-wife configuration such that they face each other from above and below.

As shown in FIGS. 2 to 5, the concave portion 4 of the lower mold 1 has contour lines 4a and 4b on the opposing surface 1a side and the lateral surface Ib side, respectively, formed in a substantially semicircular arc shape or a parabolic shape. There is.

Note that it is preferable that the contour line 4b on the side of the lateral side surface lb has a semicircular arc shape. And this lower mold 1 has a contour line 4 on the opposing surface 1a side.
A cutting blade 6 protruding upward along a is integrally formed. As shown in FIGS. 6 to 9, the recessed portion 5 of the upper die 2 has a contour line 5 on the opposing surface 2a side and the side surface 2b side.
a and 5b are each formed in the shape of a semicircular arc or a parabola. Note that it is preferable that the contour line 5b on the side surface 2b has a semicircular arc shape. The contour line 5a of the upper mold 2 is formed to be slightly larger than the outer shape of the blade 6 of the lower mold 1, and the corners along this contour line 5a are sharply machined and essentially serve as blades. There is. Note that it is also possible to provide a cutting blade on the opposing surface 2a of the upper mold 2 along the contour line 5a. Next, Figure 10A, Figure 10B, Figure 11A, Figure 11B
The operation of rounding the tip of the metal pipe 7 will be explained based on FIGS. 12A, 12B, and 12C.

FIG. 12A shows the metal pipe 7 before processing.

First, the metal pipe 7 is placed on the recess 4 of the lower mold 1 with its tip 7a side, and the other end 7b is brought into contact with the position regulating surface 3a of the position regulating frame 3.

At this time, the other end 7b is engaged with a recess 3b formed in the position regulating frame 3 and having a semi-circular cross section, so that the metal pipe 7 is positioned stably. Next, upper mold 2
When processed under a predetermined pressure, the tip 7a of the metal pipe 7 is pressurized uniformly from above and below in both the concave portions 4 and 5 of both molds 1 and 2, as shown in FIGS. 10A and 11A, and the tip 7a is It is pressed sequentially into an oval shape. As a result of this pressing, a bulge 7c is formed at the tip 7a of the metal pipe 7, as shown in FIG. 12B, which is pressed flat from above and below.
10B and 11B show the state in which the above-mentioned pressurization by both molds 1 and 2 has been completed, and the tip 7a of the metal pipe 7 is shaped into a predetermined oval shape by both the recesses 4 and 5 as described above. The shape has been rounded.

However, just before the rounding of the tip of the lever is completed, the outer periphery of the rounding portion is cut by the blade 6, and the bulging portion 1c is separated from the tip 7a. As described above, the tip 7a of the metal pipe 7 is processed into a nearly oval shape as shown in FIG. 12C.

That is, according to the present device, the tip 7a of the metal pipe 7 is rounded uniformly from above and below by just one pressurizing process using both dies 1 and 2, and at the same time, the bulge caused by the pressurization is removed. It can be cut all at once.

Note that during the above-mentioned processing, a pressing force is applied to the metal pipe 7 toward the other end 7b, but the position regulating frame 3 prevents the metal pipe 7 from shifting due to the above-mentioned pressing. Tip rounding can be performed stably and reliably.

Furthermore, if the position regulating frame 3 is configured to be freely adjustable in the distance direction with respect to the side surfaces 1a and 2a of both molds 1 and 2, the position regulating frame 3 can be adjusted even if the length of the metal pipe 7 changes. By adjusting the length according to the length of the pipe, the rounding of the tip as described above can be conveniently performed without any trouble.

FIG. 13 shows the state in which the core rod 8 whose tip 8a has been processed into a Z egg shape is inserted in advance into the metal pipe 7 when the tip of the metal pipe 7 is rounded using the two dies 1 and 2. It is designed to be rounded.

In this case, the tip 7a of the metal pipe 7 to be rounded can easily fit into the tip 8a of the core rod 8, and the tip can be rounded with a more beautiful finish, which is preferable.

Although the embodiments of the present invention have been described above, further modifications can be made based on the technical idea of the present invention.

For example, in the embodiment, rounding of the tip of a metal pipe was described, but the present invention is not limited to metal pipes only.
It can be widely applied to rounding the ends of pipes made of various materials with appropriate hardness. Further, in the embodiment, the upper mold 2 is raised and lowered, but it is also possible to adopt a structure in which the lower mold 1 is raised and lowered, or it is also possible to adopt a structure in which both the upper and lower molds 1 and 2 are raised and lowered at the same time. It is. As described above, the present invention pressurizes the pipe from both sides using a pair of dies, thereby rounding the pipe using a pair of recesses formed in both dies, and at the same time rounding the pipe into at least one of the dies. Since the pipe is configured so that the outer periphery of the rounded part is cut with a cutting blade, the tip of the pipe can be rounded in just one pressurizing process, making it possible to The number of air can be reduced by half compared to the conventional method.

Therefore, machining time is extremely shortened and machining can be carried out efficiently. In addition, the pipe is rounded by applying pressure evenly from both sides, and the outer periphery of the rounded part is subsequently cut all at once, so it is difficult to create a gap at the tip of the rounded pipe, resulting in poor finish. You can perform beautiful processing.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a metal pipe processing apparatus, in which Fig. 1 is a perspective view of the entire apparatus, Fig. 2 is a top view of the lower mold, and Fig. 3 is a front view of the same. Figure 4 is a cross-sectional view taken along the line in Figure 2, Figure 5 is a cross-sectional view taken along the line shown in Figure 2, Figure 6 is a bottom view of the upper mold, Figure 7 is a front view of the same, and Figure 8 is a cross-sectional view taken along the line shown in Figure 2. 6
Figure 9 is a cross-sectional view taken along the line shown in Figure 6, Figure 10A is a cross-sectional view of the main part of the metal pipe during processing, and Figure 10B is the cross-section of the main part after the metal pipe has been pressurized. Figure, 11th
Figure A is a sectional view taken along the line XlA-XlA in Figure 10A, Figure 11B is a sectional view taken along the line XIB-XIB in Figure 10B, Figure 12A is a perspective view of the metal pipe before processing, and Figure 12B is a sectional view of the metal pipe in the middle of processing. A perspective view, FIG. 12C is a perspective view of a metal pipe with a rounded tip, and FIG. 13 is a cross-sectional view of a main part illustrating a processing method using a core rod. In addition, in the symbols used in the drawings, 1 is the lower mold, 1a is the opposite surface of the lower mold, 1b is the lateral side of the lower mold, 2 is the upper mold, 2a is the opposite surface of the upper mold, 2b is the lateral side of the upper mold. , 4 is the concave part of the lower mold, 4
a, 4b are the contour lines of the recess, 5 are the recess of the upper mold, 5a, 5b
is the outline of the recess, 6 is the blade, 7 is the metal pipe, and 7a is the tip of the metal pipe.

Claims (1)

[Claims] 1. A pair of molds that are pressed against each other, each having two sides open, ie, the opposing surfaces of both molds and the lateral sides of both molds.
/4 A pair of egg-shaped recesses are formed to face each other, and each of these recesses has a contour line on the opposing surface side and a side surface side each shaped like a semicircular arc or a parabola. At least one of the molds is provided with a cutting blade that protrudes along the contour line on the opposing surface side, and the pipe is pressurized from both sides by both concave portions of both molds to round the pipe, A pipe processing device that uses a blade to cut the outer periphery of the rounded part.