JPS5919527Y2 - Extrusion molding equipment - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the shaping of materials by extrusion.

Japanese Patent No. 858,567 describes a method and apparatus for forming material by continuous extrusion when the material is continuously fed.

In the method, a material is supplied to one end of a passage formed between a first member and a second member, the second member has a larger surface area in contact with the extruded material than the first member, and the second member has a larger surface area in contact with the extruded material; The passageway has a closed end spaced apart from the one end and at least one die orifice associated with the closed end, and the passageway defining surface of the second member is connected to the passageway defining surface of the first member. , from the one end to the closed end in a direction toward the die orifice;
.

Frictional traction on a passageway-defining surface of the second member is adapted to draw material substantially entirely along the passageway and through the die orifice.

The device described in the patent No. 858567 has the following features:
a movable member and a fixed member defining a long passageway therebetween; an abutment member protruding into the passageway and arranged to block it; and at least one die orifice communicating with the passageway and associated with the abutment member. and a device for continuously supplying the material to be extruded to the passageway at a position spaced apart from the abutting member, the surface area of the passageway constituted by the movable member being larger than the fixed member. larger than the surface area of the passage defined by;
Therefore, when the passage-forming surface of the movable member is moved relative to the passage-forming surface of the fixed member, the material supplied to the passage is moved toward the abutting member due to the frictional traction force with the surface of the passage of the movable member. It is adapted to be moved and extruded through the die orifice.

A particular embodiment of the device described in the above-mentioned patent specification includes a rotatable wheel member which is provided with an endless groove therein and constitutes a movable member, which covers a part of the length of the groove and which extends the length of the groove. A shoe member that together forms a passage and constitutes a fixing member; an abutment member that is associated with the shoe member and protrudes into the groove and closes one end of the passageway; and the abutment member or the shoe member. It comprises at least one associated die orifice.

With this device, the material fed into the passageway can be continuously extruded through the tie orifice as long as the wheel is rotating and material is being fed continuously.

Japanese Unexamined Patent Publication No. 49-65369 discloses an improved device of the above-mentioned special type of device.

Here, the shoe member projects into the passage in front of the abutment member and includes a portion extending above the abutment member, the width of the portion being substantially equal to the width of the passage. .

A further refinement provides that the grooved wheel element consists of three abutment disks, the central disk having a smaller diameter than the outer abutment disks, so that said disks are A groove is formed with a device for maintaining the two in abutting relationship.

Such a grooving device acts on the outer surface of the outer disk body,
It may be one that generates compressive forces that act inwardly in opposition to each other.

Three-piece wheels are intended to avoid stress concentrations due to abrupt changes in direction created by groove corners present in grooves machined into single-piece wheels.

During extrusion, the wheel is subjected to thermal and mechanical retraction loads.

Thermal loads are due to temperature increases resulting from the feed material, sliding friction between the shoe parts and wheels, and deformation energy generated during processing.

Mechanical loading is due to the pressure generated in the area where pressurization and extrusion occur.

These areal loads are seasonal because they occur during rotation as parts of the working surface of the wheel move into and out of the extrusion area.

These periodic loads will eventually cause microfatigue cracks in the groove surfaces, which will increase under the pressure of the rack when the feed material is forced into it, leading to failure.

In three-piece wheels, there is difficulty in removing heat from the central part that forms the root of the groove, and this component is more susceptible to thermal fatigue failure than the side parts.

This invention can provide a wheel structure that reduces or overcomes this drawback.

For example, if a previously mentioned single-piece or three-piece wheel breaks and has to be replaced, especially if the wheel has a large diameter, the replacement wheel may be of single-piece construction or three-piece construction. However, it uses a large amount of material that requires heat treatment (if alloy steel such as 5% chromium type hot-treated steel is used, it is itself expensive). Moreover, the replacement is very expensive and difficult, and the large size and weight make handling such as removal and installation difficult during replacement.

The invention aims to provide a wheel arrangement with a structure that reduces the expense and difficulty associated with wheel replacement, and to provide an arrangement that is flexible in design, particularly groove dimensions.

According to this invention, in an apparatus for continuously forming materials by extrusion that utilizes a rotatable wheel with an endless circumferential groove, the wheel is mounted such that driving force is transmitted to a drive shaft. The drive assembly includes a drive assembly consisting of two drive parts and a driven annular body secured between the drive parts and forming a circumferential groove with the drive parts, the driven annular body being separated from the drive shaft.

Preferably, the drive assembly of the wheel arrangement is formed from two adjacent drive parts keyed to said drive shaft;
The driven annular body is held between two driving parts, and
It is equipped with a device to transmit driving force between them.

Embodiments of this invention will be described in detail below with reference to the drawings.

1 and 2, the drive assembly of the wheel device utilized in continuous extrusion molding machines of the type disclosed in Japanese Patent No. 858,567 and Japanese Patent Application Laid-Open No. 49-65369 has two parts. It has drive parts, each drive part consisting of a disk-shaped member 1 with four equally spaced keyways 2 which are drive-engaged via a drive shaft 4 and a key 3.

The key and drive shaft are shown in dashed lines in FIG.

The member 1 has a flat vertical surface 5 (FIG. 2), the opposite surface 7 of which is cut away at 6 and provided with four transverse holes 8.

Note that these horizontal holes 8 extend from the cutout portion 9 and are arranged at equal angles apart in the circumferential direction of the member 1.

FIG. 3 shows another element consisting of a driven annular body 10, which has cut-outs of semi-circular cross-section provided at a spacing and diametrical position corresponding to the hole 8 in the part 1. 1
1 is provided.

The annular body 10 has a square cross section, and when assembled with two members 1, the member 1 captures the annular body 10 between them, as shown in FIG. 5, which only shows the assembled part. The uncut portions of the border surfaces 7 face each other so as to provide a gap on the underside of the annular body 10, the cut out portion 6 receiving and engaging the annular body 10 between them, and the cut out portion 9
defines an annular channel around the assembly.

A peg (not shown) engages the hole 8 and the cutout 11 to prevent mutual rotation between the two parts 1 and the annular body 10, so that the driving force is transferred between the key 3 and the keyway 2. When the driving force is transmitted to the member 1 via the annular body 10, the driving force is also transmitted to the annular body 10.

The annular body 10 having a diameter smaller than the outer diameter of the member 1 is disclosed in the above-mentioned Japanese Patent No. 858567 and JP-A-49-6.
As described in Japanese Patent No. 5349, a peripheral groove 13 effective for continuous extrusion molding is formed.

In order to reduce the cyclic thermal effects as mentioned above, the drive shaft 4 ( Channels 12 are used to cool the sides and floor of the trench by means of coolant supplied through the gap between the radial coolant ducts (not shown) of FIG. 1) and the surface 7 (FIG. 5). good.

Similar to the three-component wheel described in JP-A-49-65369, a device for applying an inwardly acting side load to each member 1 in order to hold the member 1 and the annular body 10 in close contact with each other. (not shown) is provided.

[Brief explanation of drawings]

FIG. 1 is a side view of one of two similar drive components of a wheel assembly of a continuous extrusion device; FIG.
3 is a side view of the driven annular body of the wheel assembly, FIG. 4 is a central sectional view of the annular body of FIG. 3, and FIG. 5 is a cross-sectional view taken along the line I-II. FIG. 3 is a cross-sectional view of the drive component and the annular body in a closed state; 1...Wheel, 4...Drive shaft, 13...
groove.

Claims (2)

[Scope of utility model registration request] (1) A rotatable wheel member that is provided with an endless groove and constitutes a movable member; a shoe member that covers a part of the groove, forms a passage together with the groove, and constitutes a fixed member; an abutment member associated with the shoe member, protruding into the groove so as to close one end of the passageway, and constituting another fixing member; and at least one abutment member associated with the abutment member or the shoe member. continuous extrusion comprising a die orifice, wherein the surface area of the passage defined by the movable member is larger than that defined by the shoe member, and the endless groove is a circumferential groove disposed around or in a peripheral area of the wheel member; In the forming apparatus, the wheel member is connected to a drive assembly consisting of two drive parts attached thereto so that the drive force is transmitted to a drive shaft rotated by a drive means, and a drive assembly between the drive parts. A continuous extrusion molding apparatus, characterized in that the driven annular body is fixed and forms the circumferential groove with the drive part, the driven annular body being separated from the drive shaft. (2) the drive assembly of the wheel is two adjacent drive parts keyed to the drive shaft, and the driven annular body is clamped between the two drive parts and The device according to claim 1, which is provided with a device for transmitting a driving force between the driving annular bodies.