JPS6056414A - Extruder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a die unit and machine for extruding metal. In particular, the invention provides a method in which a channel is formed between an arcuate first member and a second member in the form of a wheel with a circumferential groove on the circumferential surface, into which groove the first member protrudes. type of machine, the wheel rotating to force material in the passageway toward one end thereof, the outlet end of said passageway having an abutment member extending across the passageway and having at least one gas orifice; extends through a portion of the arcuate first member proximate the abutment member.

[Prior art]

The abutment member is of sufficient size to completely occlude the end of the passageway (as shown in the specification of GB 1370894), especially if the material to be extruded is e.g.
When the metal is relatively hard, such as copper, the abutment member has a cross-section that is substantially smaller than the channel, leaving a substantial gap between the abutment member and the surface of the groove, so that the extruded material (unlike the unavoidable flash leakage which exits through the working clearance as most of the metal extends through the clearance).
As shown in GB 2,069,389B, when the remaining portion of the metal is extruded through the gas orifice, it remains as a lining within the groove, allowing it to re-enter the passageway.

Such machines are commonly known as radial "conform" machines and will be described hereinafter.

It has been found that the extruded product with radial conformation is significantly different in shape from the die that produced it, no doubt due to extreme asymmetry of the die section. for example,
It is like making a wire with a round die or approximately oval cross section.

[Purpose of the invention]

The aim of the invention is therefore to eliminate or at least reduce this effect.

[Structure of the invention]

According to one aspect of the present invention, a radial conforming machine provides a radial conforming machine to the extent that the strain induced on that surface due to the drag of the material entering the die is virtually independent of the strain induced on any other surface. consists of a surface around the entrance to the die such that it is in contact with the material to be extruded and isolated from other surfaces until They are designed to differ by only ±25% from each other.

According to another aspect of the invention, a die unit for a radial extrusion machine comprises a die member having an orifice forming a die or mounting an insertion die, the die unit comprising:
such that the strain induced on that surface by the drag force of the material entering the die is isolated from other surfaces in contact with the extruded material to the extent that the strain induced on that surface is virtually independent of the strain induced on any other surface. A surface is provided around the entrance to the gou, the surface having major dimensions from the gou orifice to its periphery that do not differ by 125% from each other.

〔Effect of the invention〕

The effect of the present invention is maximized when the gou is integrally formed with the goui boulder, but it can also be effectively used when an inserted gou is used.

The gouging unit is most suitably used as a separate insert, but if desired, the gouging unit can be formed directly into the first arc of the machine or integrally with the abutment member. You can also make one.

The perimeter of the isolated surface is formed by the boundary between two (or more) separate members, or one or more of sufficient depth and width to provide the required isolation. It is formed by the above depressions.

Preferably, at least a portion of its periphery is formed by at least one orifice.

Ideally, all radial dimensions of the surface from the guide orifice to the perimeter should be equal. In this case, a gou holder with its center at the gou orifice,
Alternatively, the circumference of the surface is preferably formed by an annular groove on the front side of the gouer member.

However, it has been found that useful results can easily be obtained by creating a nearly square isolation surface with sides sized equal to the width of the extrusion channel. Such rectangular isolation surfaces may be formed by the use of gouer wings or straight grooves extending across the die holder, or by the use of a suitable gouer population on the gouer side remote from the abutment member. It is formed using spaced apart circular depressions of a partial diameter cut out therein. Both of these are easier to form than an annular groove using a milling cutter (or saw) and a drill, respectively.

The invention also encompasses conform extrusion methods using the aforementioned machines or Gouy units, and products from these methods.

〔Example〕

The invention will now be described by way of example with reference to the accompanying drawings.

In the conform machine shown in Fig. 1, wheel 1 (
Due to its natural curvature, it cannot be seen in this figure) has a rectangular groove 2, which forms the walls of the working channel 303. The fourth wall is formed by an assembly consisting of a shoe 4 (only part of which is not shown), with an abutment member 5 projecting into said passage.

The radial extrusion gouers 6 are formed in a goo member 7 (this abutment member may be formed integrally with the shoe, but is preferably a separate member as shown). Ru.

The shoe, abutment member, and gouer portion are made of high strength materials, are held in place by a durable support member (not shown), and are provided with a cooling device.

FIG. 2.3 is a mutually perpendicular view of an ideal Gouy unit according to the invention. A gooey 1G is formed in the gooey holder 7, which opens into a countersink hole 9 to provide clearance around the extruded product. According to the invention, the gou orifice isolates the surrounding surface 19 from the surrounding surface 2o so that any strain induced by the drag force of the extruded material is not transmitted to the elongated surface 19 but dissipates into the body of the gou member. It is surrounded by an annular groove 18 of sufficient depth.

FIG. 4.5 is a mutually perpendicular view of a more practical gouing unit according to the invention, in which the isolated surfaces 21 are substantially rectangular, with three sides extending along the edges of the gouing member 70. and is bounded on its upstream side by a groove 15 ground or otherwise cut across the surface of the gouer member. The groove is, for example, 1 mw wide and 2 mm deep.

6 and 7 are mutually perpendicular views of another practical embodiment of the Gui unit according to the invention, FIGS.
It is similar to the figure, but differs in the following points. That is, the front side of the isolated surface has a diameter of 9IIIll, for example by drilling a diameter of 6 mm and a depth of 2.5 mm (at the edges).
It is formed by a shallow circular depression 12 that is dimensioned appropriately for the wheel groove. Because the narrow portion 13 is relatively flexible, the portion 14 around the die is also effectively isolated when extreme stresses are present in use. Compared to FIG. 4.5, this design has the advantage that there is no negative impact on the risk of flash leakage on the sides of the die section.

In this example, the die unit used for the 9 mm groove is fully described in UK Patent Application No. 2102321A and has the shape shown in Figure 6.7 [Inconel Alloy 7
Made from Inconel alloy with the registered trademark ``18''.

The circular die has a diameter of 2.500 mm and the circular depression has a diameter of 6.0 mm and a depth of 2.500 mm. The extruded steel wire has a virtually circular cross section with a diameter of 2.460 mm (17 mm), as opposed to the wire shown in Figs. Wires made using conventional die units have a diameter of 2.432mm~
It had a severely non-circular cross section at 2.465 mm.

The same results were obtained using a die unit of the form shown in Figure 4.5. In this case, the diameter of the die is 2,500 mm, the width of the straight groove is 1°, and the depth is 2°.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a radial conforming machine (according to British Patent No. 2069389B). Figures 2 and 3, 4 and 5, 6 and 7 are cross-sectional and bottom views of the die unit of the present invention, respectively. [Explanation of symbols] 1...Wheel 2...Rectangular groove 3...
・Working path 4...Nu 5...Abutting member 6...Radial extrusion die 7...Die member 9...Countersunk hole 12...Circular depression 13...Narrow portion 14...Part around the die 15...Groove 16...Die 20...Surrounding surface 21...Isolation surface Patent applicant BIC Nomi Brick Limited Conno ξ
Representative Tadashi Wakabayashi

Claims (1)

Claims: 1. The surface around the entrance to the die is such that the strain induced on that surface by the drag of the material entering the die is virtually independent of the strain induced on any other surface. , isolated from other surfaces in contact with the material to be extruded, characterized in that said surfaces have major dimensions from the die orifice to its periphery, which differ from each other by no more than 25%. Radial conform extrusion machine.2 Radial conform extrusion machine according to claim 1, characterized in that at least a portion of the circumference around the isolated surface is formed by at least one recess. 3. Radial conform extrusion machine according to claim 1, characterized in that the circumference of the isolated surface is formed by an annular groove having its center at the die orifice. 4. The isolated surface is substantially rectangular and is defined by three edges of the gou member and a straight groove extending across the gou member. 5. The radial conform extrusion machine of claim 1. 5. The isolated surface is cut into the three edges of the gouer member and the face of the gouer member and on the gouer side spaced from the abutment member. 6. A radial conform extrusion machine according to claim 1, characterized in that the machine is formed by a circular recess rotating at a distance from a gou inlet in the die. Alternatively, it is made of a goo member having an orifice to which a push-in buoy is attached.
A radial conform extrusion machine as described in Section 1, wherein the strain induced on its surface by the drag force of the material flowing into the die is virtually independent of the strain induced on any other surface. have a surface around the die that is isolated from other surfaces in contact with the material to be extruded to the extent that the die has a major dimension from the die caliper to its perimeter, which The Gui unit is characterized in that it differs by only ±25%. 7. A die unit according to claim 6, characterized in that at least a portion of the periphery around the isolated surface is formed by at least one depression. 8. Goo unit according to claim 6, characterized in that the periphery of the isolated surface is formed by a circular groove having its center at the die orifice. 9 The isolated surface consists of the three edges of the Gui unit and
7. A goo unit according to claim 6, characterized in that the goo unit is formed by a straight groove extending across the goo unit. 10. The isolated surface includes three edges of the Goo unit and a circular recess cut into the face of the Goo unit and spaced from the die inlet on the side of the die remote from the abutment member. The goo unit according to claim 6, characterized in that it is formed by: