JPS63278610A - Manufacture of special-shaped pipe by hot extrusion - Google Patents

Abstract

PURPOSE:To manufacture a special-shaped pipe excellent in accuracy of positioning holes and good shape by using a composite billet bored holes parallel to the longitudinal direction of a columnar billet and packed with a glass powder in the holes. CONSTITUTION:The composite billet 3 is formed by boring in the longitudinal direction of the columnar billet 1 and by packing the glass powder in the holes. Then, this billet is heated to insert into a container 5, passed through a die 7 by a stem 6 to work a hot extrusion working, then the glass is removed from the extruded material 8. When the composite billet 3 packed with the glass powder is heated and the hot extrusion working is performed, the glass is fluidized, and resisting the deforming pressure of the billet, the extruded material 8 packed uniformly with the glass in the longitudinal direction is obtained. In order to remove the glass from the extruded material 8, both ends of the material 8 are opened to press inside the holes while the glass is fluidized.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a metal tube having a plurality of holes parallel to its length,
Alternatively, the present invention relates to a method of manufacturing a deformed tube such as a metal tube having an eccentric hole by hot extrusion.

[Conventional technology]

A deformed tube having a plurality of holes parallel to its length as shown in FIG. 3(a) is used when sending a plurality of liquids or gases. Conventionally, to manufacture such irregularly shaped pipes, there is a method of drilling a round bar and then cold-drawing it if necessary to make it smaller in diameter, but it is difficult to drill holes parallel to the round bar. Furthermore, there is a problem that it is not possible to manufacture long materials. In addition, a deformed tube having an eccentric hole as shown in FIG. 3(b) is manufactured by hot extrusion, etc.
This is cut and used for eccentric cams, but there are problems with the accuracy of the hole positions, and there are also problems with shape defects such as warping and bending of the extruded material.

[Problem that the invention seeks to solve]

The present invention provides a deformed tube having a plurality of holes parallel to the length direction,
Alternatively, we can produce irregularly shaped tubes with eccentric holes with good yield.
The purpose is to manufacture with high precision and efficiency.

[Means/effects for solving the problems] The present invention involves making holes in a cylindrical billet parallel to its length, filling the wire holes with glass powder to form a composite billet, and heating the composite billet. It is characterized by hot extrusion processing and removing glass from the extruded material.

In the following, the invention will be explained using as an example the production of a profiled tube having two holes in the longitudinal direction.

As shown in FIG. 1, holes are made in the length direction of the cylindrical billet 1, and the wire holes are filled with glass powder 2 to form a composite billet 3.
This is then heated, inserted into a container 5 as shown in FIG. 2, and hot extruded through a die 7 using a stem 6 to remove the glass from the extruded material 8.

In order to fill the holes of the composite billet 3 with glass powder, the first
As shown in FIG. It is possible to use a method such as filling the powder 2 and covering both ends with lids 4 as shown in FIG. 1(c).

When the composite billet 3 filled with glass powder 2 is heated and hot-extruded, the glass becomes fluid inside the composite billet 3, but resists the deformation pressure of the billet and the glass is uniformly distributed in the length direction. An extruded material 8 filled with .

To remove the glass from the extruded material 8 after hot extrusion, open both ends of the extruded material 8 while the glass is in a fluid state and apply pressure inside the hole, or tilt the extruded material 8 to remove the glass. A means for flowing out the extruded material 8, a means for cooling and straightening the extruded material 8, and then reheating the glass to make it fluid and flowing it out, a means for straightening the extruded material 8 after cooling the extruded material 8 and solidifying the glass Means such as crushing the glass and mechanically removing it can be used.

The irregularly shaped tube obtained by removing the glass goes through the usual refining process and becomes a product. In addition, this product can be further drawn or drawn to produce a deformed tube with a smaller diameter.

〔Example〕

Made of 545C (common steel), diameter 170mm, length 40mm
Two holes with a diameter of 40 mm are drilled parallel to the length direction of the cylindrical billet of 545C at 20n intervals without penetrating it as shown in Fig. 1(b), and filled with glass powder made of window glass. It was heated with a lid on and hot extruded to a diameter of 50 m. This was straightened by roller straightening, both ends were cut to expose the glass, and the glass was reheated to flow out.

As a result, 50 cranes in diameter, approximately 5 m in length, and 12 cranes in hole diameter.
A two-hole irregular tube with a hole spacing of 5fi was obtained. The position and size of the holes were as designed, there was no variation in the length direction, and the shape after extrusion was also good.

〔Effect of the invention〕

According to the present invention, hot extrusion processing of deformed tubes can be performed without using a mandrel, so that tubes having multiple holes,
It is possible to manufacture irregularly shaped tubes, such as tubes having holes that are eccentric in their cross section, with good hole position accuracy and good shape. Further, since drilling unlike the conventional method is not required, long irregularly shaped pipes can be manufactured with high yield and high efficiency.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining the method of the present invention, and FIG. 3 is a diagram showing an example of a deformed tube to which the present invention is applied.

Claims (1)

[Claims] Holes are made parallel to the length direction of the cylindrical billet, the holes are filled with glass powder to form a composite billet, the composite billet is heated and hot extruded, and the glass is removed from the extruded material. A unique method for manufacturing deformed tubes using hot extrusion.