JPS6239052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming a pipe fitting end portion having two bead-like enlarged portions from a tubular material.

As shown in Fig. 1, the basic molding device consists of a mold 1 divided into two parts in the radial direction;
A hole for inserting a tubular material is provided in 1', and 2 is inserted into the hole.
A parallel hole 10 is formed in the bead-like enlarged portions 3, 3a of the strip and the end surface thereof, and a mandrel 6 that supports the end of the material 7 is fitted into the bottom side of the insertion hole.
A punch 5 is provided opposite the insertion hole, an elastic body 8 is inserted into the material 7 set in the mold, and the punch 5 is press-fitted into the material 7 to expand the elastic body 8 in the radial direction. The material 7 is then molded into the shape of the hole in the mold. The material formed in this manner has unnecessary parallel parts at the ends, which must be removed by cutting or the like.

The present invention provides an apparatus for forming the end of a pipe joint having two bead-like enlarged portions that do not require cutting.

This will be explained below by giving examples. FIG. 1 is a longitudinal cross-sectional view showing the state before molding, and the molds 1 and 1' consist of a pair of symmetrical members divided into two parts in the radial direction, and the inside has an opening at one end to be molded. A material insertion hole is formed, and a mandrel 6 that supports the end of the inserted tubular material 7 is fitted at the other end, that is, the bottom side of the hole. The material insertion hole is formed with a half-bead-shaped annular recess 4 opening at the end surface and a complete bead-shaped annular recess 3 following the half-bead-shaped annular recess 4 .
A punch 5 held by a holder 2 is provided opposite the holes of the molds 1, 1'. A semi-bead-shaped annular recess 4' is formed on the end surface of the punch holder 2 facing the mold. The end surface of the recess 4' is connected to the half-bead-shaped annular recess 4 of the mold, and the inner diameter thereof intersects with the outer periphery of the punch 5.

From the state shown in FIG. 1, by press-fitting the punch 5 into the material 7 inserted into the mold using a hydraulic device or the like, as shown in FIG. The material 7 is expanded in the radial direction and molded into the hole shape of the molds 1, 1' up to the complete bead portion 3. Furthermore, as the punch holder 2 comes into pressure contact with the molds 1 and 1', the half-bead-shaped annular recesses 4 and 4' of both become a single complete bead-like recess, and the tubular material pressed in the axial direction A complete bead-like enlarged portion is also formed at the tip of 7.

Since no unnecessary straight pipe portion is formed at the end of the pipe joint formed by the above-described apparatus, finishing by cutting or the like is not required. A completed pipe joint is obtained by attaching the end portion of the pipe joint to the pipe joint body by welding or the like.

FIG. 4 shows another embodiment, in which molds 1a,
A complete bead-like annular recess 3 and a half-bead-like annular recess 4 are formed at both ends of 1a′, respectively.
A tubular material 7a to be formed is inserted through the mold, and a punch 5 and a punch holder similar to those shown in FIG. The company manufactures pipe fittings. Furthermore, if L-shaped, T-shaped, etc. materials are prepared in advance, the method can also be applied to the production of pipe joints of these shapes.

As explained above, the pipe joint end forming apparatus according to the present invention is useful as a pipe joint end forming apparatus having two bead-shaped enlarged portions.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a basic pipe joint end forming device, Fig. 2 is a longitudinal cross-sectional view showing the improved device before material forming, and Fig. 3 is a view also showing the state after forming. FIG. 4 is a longitudinal sectional view showing the state of another embodiment before material molding. 1, 1': Mold, 2: Punch holder, 3: Bead-shaped annular recess, 4, 4': Half-bead-shaped annular recess,
5: punch, 6: mandrel, 7, 7a: tubular material, 8: elastic body, 9: mounting bolt, 10: parallel part.

Claims (1)

[Scope of Claims] 1. A radially divided pipe having a hole for inserting a tube feed material to be molded, which has two annular recesses at one end in the form of a half bead and a full bead opening at one end. a mandrel that is fitted onto the other end of the mold and supports the non-forming end of the material; a punch that is press-fitted into the molding end of the material; a punch holder having a half-bead-shaped annular recess connected to the half-bead-shaped annular recess and intersecting the outer periphery of the punch at an end opposite to the one end of the mold; and a punch holder inserted into the material and pressed in the axial direction by the punch. A pipe joint end forming device characterized by comprising an elastic body that expands in the radial direction when the pipe joint is bent. 2. A radially divided mold having a hole for inserting a tubular material to be molded, which has two annular recesses at both ends, one in the shape of a half bead and the other in the shape of a full bead, and the above-mentioned material. a pair of punches that are press-fitted into both ends of the punch, and a half-bead-shaped annular recess that holds the punch and is connected to the half-bead-shaped annular recess at the end opposite to the end of the mold and intersects with the outer periphery of the punch. A pipe fitting end forming device comprising: a pair of punch holders having a recessed portion; and an elastic body that expands in the radial direction when inserted into the material and pressed in the axial direction by the punch.