JPS5849133Y2 - Rotary continuous extrusion equipment for high-precision hollow materials - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary continuous extrusion device for high-precision hollow materials with high wall thickness accuracy.

Various rotary continuous extrusion devices for extruding hollow materials, such as pipes, are already known, but the simplest device among them consists of a rotating wheel with a single circumferential groove, and a rotating wheel with a circumferential groove. This rotary extrusion device consists of a shoe and an abutment that cover part of the circumferential groove, and extrudes the pipe in the radial direction of the wheel.
When a material with a diameter of, for example, 9.5 ttm is used as a supply material, the width of the circumferential groove of the wheel is determined by this material diameter, so a mandrel device is used to drill a plurality of diversion holes so that they are lined up in the width direction of the wheel groove. was a serious problem.

In order to improve this point, it is possible to drill diversion holes in the front and back in the groove direction, but in the case of diversion holes with the same cross-sectional area, the product that is formed after joining due to the pressure difference between the materials passing through each diversion hole (
The problem was that the thickness of the pipes (pipe, etc.) was uneven.

This invention was made to eliminate the above-mentioned drawbacks.
Dividing holes are drilled in the direction of the groove, and the cross-sectional area of the hole on the front side in the wheel rotation direction is larger than the cross-sectional area of the hole on the front side (abutment side) in the wheel rotation direction, to reduce the pressure in the annular groove where they merge. This paper aims to present a rotary continuous extrusion device that improves balance and makes it possible to manufacture uniform-walled tubes with high precision.

Hereinafter, the embodiment will be explained with reference to the drawings. In the drawing, reference numeral 1 denotes a wheel driven and rotated by a drive device not shown, and the outer periphery of the wheel is provided with a circumferential groove 2 having a U-shaped cross section.

3 is a die segment. An abutment 4 covers a part of the circumferential groove 2 of the wheel 1 together with the die segment 3, and forms an extrusion chamber for extruding the metal material 5 in cooperation with the wheel.

6 is a mandrel held by the die segment 3.

The die segment 3 and the abutment 4 are attached to a shoe 1 fixed to a frame (not shown).

Below is the mandrel 6 and the die segment 3 that holds it.
The detailed structure of is explained below.

8 is a susceptor mandrel holder held on the die segment 3 facing the extrusion chamber, and a wheel 1 is attached to the mandrel holder 8.
A hole 9 having an oval cross section is drilled on the front side along the rotational direction, and a hole 10 having a small cross-sectional area is arranged in parallel with the hole 9 on the front side (on the abutment 4 side).

Reference numeral 11 denotes a reinforcing ring, into which a die 12 is fitted into a tapered hole.

An annular groove 13 communicating with the holes 9 and 10 is formed between the mandrel 6 protruding from the mandrel holder 8 and a reinforcing ring 11 surrounding it, and the circumferential gap between the mandrel 6 and the die 12 is The structure is pipe-formed.

In the above embodiment, the hole 9 on the front side in the wheel rotation direction among the branch holes facing the extrusion chamber was made oval in cross-section, but the same effect can be obtained if the cross-sectional area is larger than that of the other hole 10 (the cross-sectional shape does not matter). ), and may be made into a round hole 9' as shown in FIG.

Since the present invention is constructed in this way, when the rod-shaped metal material 5 is supplied to the circumferential groove 2 of the wheel that is being driven and rotated, the material 5 is drawn in by the frictional force, and the tip of the material is thrust into the circumferential groove 2 and held. After reaching the abutment 4, it is pressurized by the subsequent material and becomes semi-molten.

Thereafter, the semi-molten metal material which is further pressurized flows through the holes 9 and 10 of the mandrel holder 8 and joins within the annular groove 13.

In the process from branching to merging, the pressure is balanced by the cross-sectional area difference between the branching holes 9 and 10, and after the merging, the metal material is placed in the circumferential gap between the mandrel 6 following the annular groove 13 and the die 12 with balanced pressure. It is extruded from the pipe as a pipe.

As described above, according to the present invention, the flow dividing hole facing the extrusion chamber is made so that the cross-sectional area of the hole on the front side in the wheel rotation direction is smaller than the cross-sectional area of the hole on the front side (abutment side) in the wheel rotation direction. Since the pressure balance within the annular groove is improved, it has the advantage of being an industry leader in that it is possible to continuously manufacture large quantities of highly accurate, even-walled tubes.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a rotary continuous extrusion device according to the present invention, and FIG. 2 is an enlarged sectional view of the main part, also showing the state of pipe extrusion. FIG. 3 is a bottom view of a die segment with a mandrel device assembled therein, and FIG. 4 is an explanatory view of the main parts showing another embodiment. DESCRIPTION OF SYMBOLS 1... Rotating wheel, 6... Mandrel, 2... Peripheral groove, 8... Mandrel holder, 3... Die segment, 10・・・・・・
...Hole, 4...Abutment, 12...
...Die, 9...hole.

Claims (1)

[Scope of utility model registration request] A rotating wheel with an outer circumferential groove, a die segment and an abutment that cover a part of the outer circumferential groove and cooperate with the rotating wheel to form an extrusion chamber, and a housing disposed in the extrusion chamber to form flow dividing holes in the front and rear directions of the rotation direction of the wheel. A rotary continuous extrusion device consisting of a mandrel device and a gou is drawn, and the cross-sectional area of the hole on the front side in the direction of wheel rotation is the cross-sectional area of the hole on the front side (abutment side) in the direction of wheel rotation. A rotary continuous extrusion device for high-precision hollow materials that is characterized by a more rigid structure.