JPS5919526Y2 - Continuous extrusion molding equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an apparatus for forming materials by extrusion.

The specification of Japanese Patent No. 858576 filed by the present applicant discloses a method and apparatus that can continuously form a material by extrusion if the material is continuously supplied, and has filed a request for utility model registration. ing.

The method generally includes dispensing material to one end of a passageway formed between first and second members, the second member having a surface area larger than that of the first member. also has a large surface area for accommodating the material to be extruded, the passageway having a closed end remote from the one end and having at least one die orifice associated with the closed end; Friction of the passage forming surface of the second member is achieved by moving the passage forming surface of the second member from the one end to the closed end in a direction toward the die orifice with respect to the passage forming surface of the first member. drawing said material substantially entirely along said passageway and through said die orifice by means of a targeted traction force.

Generally speaking, the device in the above-mentioned patent No. 858567 includes a movable member and a fixed member that form an elongated passageway between them, and an abutment member that is arranged to protrude into the passageway and close it. a member, a device for forming at least one die orifice associated with the abutment member starting from the passageway, and a device for continuously feeding material to be extruded into the passageway at positions spaced from the abutment member; a surface area of the passageway defined by the movable member is greater than a surface area of the passageway defined by the fixed member; When the passage-forming surface moves relative to the passage-forming surface of the fixed member, the material fed into the passage is moved together with the passage surface of the movable member towards the abutment member by frictional traction; The entire body is forced through the die orifice.

The above device disclosed in the above Patent No. 858567 includes:
As a special type, a rotatable wheel member having an endless groove and constituting the movable member, and a shoe that covers a part of the length of the groove and forming a passage together with iron and constituting the fixed member. a member, an abutment member associated with the shoe member and protruding into the groove to close one end of the passageway, and at least one die orifice associated with the abutment member or the shoe member. There is.

The device is capable of continuous extrusion of material fed into the passageway through the die orifice by rotating the wheel to feed material continuously.

Japanese Patent Application Publication No. 49-65369, filed by the present applicant, describes several improvements in the above-mentioned device.

In these improvements, the shoe member has a portion that protrudes into the passageway in front of the abutting member, extends beyond the length of the passageway, and has a width approximately equal to the width of the passageway. It includes improvements.

In another improvement, the grooved wheel member comprises three abutment discs, the diameter of the central disc being smaller than the diameter of the outer abutment discs to form the groove, and A device is provided for holding the disks in abutting relationship.

Such a device counteracts compressive forces acting inwardly on the outer surface of the outer disk.

The three-piece wheel is a means of avoiding stress concentrations in sudden changes in direction due to the groove corners present in the grooves machined into the single-piece wheel.

During extrusion the wheel is subjected to cyclic loading.

This loading is partly thermal and partly mechanical.

This heat loading derives from the temperature increase resulting from sliding friction between the feed material, the shoe member and the wheel, and from the deformation energy generated during the extrusion process.

Mechanical loading is derived from the pressure generated in the areas where swaging and extrusion occur.

These two loadings occur as each part of the working surface of the wheel moves in and out of the extrusion area during rotation.
It is cyclical.

This combined cyclic loading causes micro-fatigue cracks in the face of the groove, which propagate as the feed material is forced into the crack by the pressure, and are prone to failure.

In the three-piece wheels described above, it is difficult to remove heat from the central part, which forms the bottom of the groove, and this part is more susceptible to thermal fatigue failure than the side parts.

The present invention seeks to provide a wheel structure that reduces or eliminates this drawback.

Furthermore, there are economical problems when using versatile retooling dies, or when trying to achieve maximum production rates, or when extrusion equipment is oversized to achieve large cross-sections for any other reason. arise.

Firstly, the cost of providing a large disk is extremely high.

That is, the disc material requires high strength and is typically an expensive heat treated alloy such as 5% chromium hot work steel that has been hardened and tempered to provide high guaranteed strength.

Second, the cost of complete replacement of the entire wheel in case of wear or damage is equally high.

In Japanese Patent Application Publication No. 117667/1983, filed by the present applicant, a three-component wheel was proposed.

This three-piece wheel is advantageous in that it avoids at least some of the problems inherent in single-piece or three-piece wheels, particularly the problem of removing heat from the bottom of the groove.

However, three-piece wheels still suffer from the economic problems mentioned above.

It is therefore an object of the present invention to provide a wheel structure which alleviates the aforementioned economic problems without losing at least some of the advantages of conventional three-part wheels or three-part wheels.

In accordance with the invention, a rotatable wheel structure is provided in or for an apparatus for continuously forming material by extrusion, the wheel structure having an endless groove in its periphery or peripheral area. It is of at least a three-part system, one part being a driving part and being rotationally driven, and the other parts being fixed to said driving part and being rotated by it. The other parts are provided with grooves and can be removed from the drive part and replaced.

Due to the above-mentioned replaceability of the above-mentioned other parts, the above-mentioned Other parts can be replaced.

This replacement is obviously not as expensive as replacing the entire wheel.

In order to avoid the need for removal of the drive shaft of the wheel assembly for the device for continuous shaping of material by extrusion, the above-mentioned replaceable parts are themselves made as a composite of a plurality of arcs, These arcuate bodies are removably fixed to the drive component, for example, by applying a load to the inclined surfaces that engage with each other.

Each of the arcuate bodies described above has a contact surface at one or both ends raised from its original end face for end engagement under steady stress, and is capable of disengaging from the groove during operation. extruded material from entering the joint.

If the part removably fixed to the drive part is a composite part, the groove area consists of three parts, namely two side parts and a lower part forming the bottom of the groove. It can be made from one part or it can be made from two parts whose joining plane lies within the width of the groove.

Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, like parts are designated by like numbers.

Apparatus for the continuous shaping of materials by extrusion are described in the above-mentioned Japanese Patent No. 858,567 and Japanese Patent Application Publication No. 1983-65369, filed by the present applicant.

This device has wheels with peripheral grooves.

In Patent No. 858,567, the wheel is shown as a single piece with grooves machined or otherwise formed around the periphery.

In Patent Application No. 49-65369, a variant of a three-part wheel is described, which has a part consisting of three abutment discs, the central disc having a diameter smaller than that of the outer discs. to define a peripheral groove, and the parts are held in tight engagement with each other by applying an external force on the outer disk.

The applicant's ongoing patent application was published on 117-1986.
No. 667 describes a three-part wheel with a joint plane lying within the groove width.

Patent No. 858567 and patent application published in 1972-
The construction of a wheel according to the invention for a continuous extrusion device of the type described in No. 65369 will be explained with reference to FIG.

FIG. 1 shows only part of a wheel assembly 1, which includes a drive part 2 keyed or otherwise secured to a drive shaft (not shown) and a drive part 2. The annular manufactured part 3 supported by the

The manufactured part 3 is fixed to the drive part 2 by means of a retaining ring 4 which engages with the floor of a peripheral recess 5 of the part 2.

The recess 5 has sloping side faces 6 into which the corresponding sloping side 7 of the manufactured part 3 engages.

The opposite side 8 of the manufactured part 3 is sloped opposite to the slope of its side 7 and engages with it the side 9 of the retaining ring 4.
is correspondingly inclined opposite surface 8.

A side load (indicated by the arrow in FIG. 1) is applied around the entire circumference of the retaining ring 4 to cause it to engage the workpiece 3, and the sloping engagement surfaces 6, 7 and 8°9 The load has a hold-down component and a hold-incomponent.
and the hold-incomponent
), so that the manufactured part 3 is held firmly in driving engagement with the drive part 2 of the wheel assembly 1.

The side loads are provided by pHgrim nuts or the like.

If desired, one or more radial keys may be used in addition to the above-mentioned means for securing part 3 in driving engagement with part 2.

One such key is shown schematically in dashed lines in FIG. 1 and designated by the number 10.

By providing the ring 4, the component 3 can be removed by releasing the load and moving the ring 4 outward in the recess 5.
can be removed from part 2 and replaced if part 3 becomes worn or damaged.

A groove 11 having a U-shaped cross section is provided on the outer peripheral surface of the part 3, and this groove 11 is used for a stationary shoe, abutting body, and a die (
(not shown) to form an extrusion channel for a continuous extrusion device of the above type.

In a variant which makes it possible to replace worn or damaged parts as well as to save further costs, the manufactured part 3, instead of being made into a complete ring, is divided into a number of separate parts, each of which is an arc. , these arcuate bodies are assembled to form a complete ring.

One such arc is shown at 3' in FIG.

The number of arcuate bodies 3' may be as small as about four, but from a practical point of view, it may be as large as possible.

If the wheel has a relatively large diameter, the number of arcs is preferably 8 or 16.

One improvement is to provide a raised contact surface 12 at one or both ends (only one end shown) of each arc, as shown schematically in phantom in FIG.

This structure increases contact stress and reduces the possibility of extruded material penetrating the joint between the arcs.

That is, when material enters the joint, a gap is created and the intrusion increases further, causing the gap to self-expand and eventually lead to failure.

A further advantage of forming the part 3 as an arc-shaped body 3' is that the number of jigs required for manufacturing can be reduced.

1 and 2, an alternative to a single annular ring and a plurality of arcuate bodies forming a composite annular ring are shown, the parts being formed as a single piece when viewed in the width direction.

Still other embodiments are shown in FIGS. 3 and 4.

The embodiments shown in FIGS. 3 and 4 are functionally similar to the embodiment shown in FIG. The difference is that part 3' is made of two or more parts.

The embodiment of FIG. 3 shows three such members, an outer member 13,14 and an inner member 15;
The inner part 15 is lower in height than the part 13.14 and has a groove 1.
1 floor is formed.

The outer member 13 has an inclined outer side surface 7 which cooperates with the inclined side surface 6 of the recess 5 in the drive part 2, and the outer member 14 has an inclined side surface which cooperates with the inclined side surface 9 of the retaining ring 4. 8, and the side faces are similar to the embodiment of FIG.
It has a side load that exerts a force on the composite part 3 that has a downward restraining component and an inward restraining component.

The inner surfaces 16.17 of each of the members 13.14 are vertical and each have a relief 18.19 through which the extruded material in the groove 11 penetrates between the contact surfaces. The contact surface is designed to prevent or minimize this.

Elements 13, 14, and 15 may be made as a single ring or, as described above, in several arcs.

If desired, one or more keys 10 may be provided to assist in transmitting drive power from component 2 to composite component 3.

If a key is used, all three members have matching keyways.

The embodiment shown in FIG. 4 is similar to the embodiment of FIG. 3, but instead of forming the manufactured part 3 or part 3' as a composite of three parts, two parts are used. .

One member 20 has an inner side 21 with an inclined outer side 7 and a relief 22 which cooperates with the inclined side 6 of the recess 5 of the drive part 2, which extends the side 21 of the other side. A relief 24 on the vertical inner surface 23 of the member 25 is formed as a contact surface for engagement with a corresponding contact surface provided therein.

The outer surface of the member 25 is sloped so that the retaining ring 4
, which have side loads acting in the same manner as described above to restrain the forming members 20.25 of the composite part 3 inwardly and downwardly.

If desired, one or more keys 10 may be provided to aid in the transmission of drive power from component 2 to composite component 3, and composite component 3 may be provided with several arcuate bodies as described above. You can also make it with

A further advantage is obtained because of the passages formed by reliefs 18.19 in the embodiment of FIG. 3 and by reliefs 22.24 in the embodiment of FIG.

By suitably providing one or more supply passages in the drive part 2 in communication with said passages, a suitable liquid refrigerant can be circulated into said passages, thereby making the components of the groove 11 subject to temperature cycling as described above. Can be cooled.

In the structure described with respect to FIGS. 1 and 2 and the structure described with respect to FIG. 4, the groove 11 is U-shaped in cross section.

This shape is given by way of example only; other cross-sections can be chosen to suit the raw material used, which is preferred if the feedstock is of round cross-section and the material is aluminum.

Another example is the trapezoid cross section shown in the embodiment of FIG.

This cross section is particularly suitable when the raw material is a continuously cast material.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a wheel structure for a continuous extrusion device of the present invention, FIG. 2 is a detailed perspective view of a part of the wheel structure, and FIGS. 3 and 4 are diagrams showing other embodiments. FIG. 1 is a cross-sectional view similar to FIG. DESCRIPTION OF SYMBOLS 1... Wheel structure, 2... Drive component, 3... Groove surface, 3'... Arc-shaped body, 4... Retaining ring, 6. 7.
8. 9... Slanted side surface, 11... Groove, 12.
...Raised contact surface, 13.14.15°20,25...
Composite groove component component.

Claims (5)

[Scope of utility model registration request] (1) A rotatable wheel member having an endless groove and constituting a movable member, and a shoe member that covers a part of the length 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 to close one end of the passage and constituting another fixing member; and at least one abutment member associated with the abutment member or the shoe member.
a die orifice, the surface area of the passage formed by the movable member is larger than the surface area of the passage formed by the shoe member, and the endless groove is formed around or in a peripheral area of the wheel member. An apparatus for continuous forming of materials by extrusion is provided, in which the wheel member is an assembly of at least two parts, one part of which is adapted to be rotated by a drive. and the other parts are driven parts fixed to and rotated by the driving part,
Continuous extrusion apparatus, characterized in that the parts of the abovementioned above are provided with grooves and are removable from the drive part for replacement. (2) The replaceable part itself is a composite body assembled from a plurality of arcuate bodies, and the arcuate bodies are removably fixed to the drive part by applying a load to the inclined surfaces that engage with each other. A continuous extrusion molding apparatus according to claim (1) of the utility model registration claim. (3) Each of the arcuate bodies has a contact surface raised from the original end surface at one or both ends thereof, and the ends are engaged with each other with steady stress;
The continuous extrusion molding apparatus according to claim 2, wherein the continuous extrusion molding apparatus is adapted to prevent or reduce intrusion of extruded material from the groove into the joint between the arcuate bodies during operation. (4) The component replaceably fixed to the drive component is a composite component consisting of three components, the groove area is made of the three components, and two of the three components The continuous extrusion molding apparatus according to claim 1, wherein is a side part, one of which is low in height and forms the floor of the groove. (5) The component replaceably fixed to the drive component is a composite component consisting of two components, and the groove area is. The continuous extrusion molding apparatus according to claim 1, which is made of the two parts, and the joining plane between them is within the width of the groove.