JPH10328725A - Continuous extruding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably discharge accumulated burrs between the tools of rotating wheel and fixed shoe block, and to suppress the fluctuation of an extrusion condition by forming side face seals by projecting bank parts provided on both sides of the peripheral groove of the rotating wheel and recessing bank parts provided on both sides of the jetty of the fixed shoe block, and making a hole in one part of the side face seal. SOLUTION: The endless peripheral groove 12 is formed in the center of the outer peripheral surface of the rotating wheel 11, and the projecting banks 13 are formed on both sides of the peripheral groove 12. A jetty fitting in the peripheral groove 12 is formed on the sliding part of the rotating wheel 11 of the fixed shoe block 14, and the recessing bank parts are formed on both sides of the jetty. By the combination of the peripheral groove 12 of the rotating wheel 11 and the jetty of the fixed shoe block 14, the transportation path 17 of a material is formed. By oppositely equipping the projecting bank part 13 of the rotating wheel 11 and the recessing bank part of the fixed shoe block 14, a side face sealing part 20 is formed, and by making the hole in one part of the side face sealing part 20, a burr discharging part 21 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous extrusion apparatus in which a material is continuously extruded at a predetermined extrusion pressure by a relative rotation between a rotating wheel and a fixed shoe block.

[0002]

2. Description of the Related Art FIG. 5 shows a rotary wheel type continuous extrusion apparatus proposed by the present applicant. In this device, an endless peripheral groove 2 is provided on the outer peripheral surface of the rotating wheel 1, and the peripheral groove 2 is provided on one fixed shoe block 3 side.
And the combination of the peripheral groove 2 and the ridge 4 forms a material transport passage 5.

[0003] An abutment 6 for closing the transport passage 5 is provided on the back side opposite to the entrance of the transport passage 5, and a hole formed so as to communicate from the surface of the transport passage 5 to the outside. A die 7 is provided at the portion.

In this type of rotary wheel type continuous extruder, a high pressure is generated up to the extrusion pressure of the material to be supplied to the transport passage by the rotary drive of the rotary wheel. It is necessary to seal between the moving rotating wheel and the stationary shoe block so as not to generate burrs of the material.

[0005] In principle, if the predetermined gap between the rotating wheel and the fixed shoe block is reduced, the generation of burrs should be suppressed. This gradually accumulates, and there is a tendency for a vicious cycle in which the inter-tool gap is further enlarged and burrs are further increased.

In the continuous extrusion apparatus shown in FIG. 5, burrs accumulate in the portion A, that is, as shown in the cross section in FIG. 6, the burrs 8 are formed between the bank of the rotating wheel and the step of the fixed shoe block. Accumulation occurs, and the discharge state of the material changes depending on the structure of the device, the material, the temperature condition, and the like. Note that FIG.
B is shown in cross section.

[0007] The accumulation of burrs in the above-described portions increases the torque of the rotating shaft of the rotating wheel, resulting in insufficient power. In addition, since the burrs act as a separating force between the fixed shoe block and the rotating wheel, a tool gap is opened, a sealing effect between tools is insufficient, and the amount of burrs increases. . Further, heat is generated due to frictional contact between the burr accumulation fixing portion and the rotating wheel, and the temperature rises and the extrusion condition becomes an unstable region.

Various techniques have been proposed as a tool-to-tool sealing technique for the above-mentioned burrs.
Green has proposed a structure in which inserts are provided in a fixed shoe block and sealing is performed on the side surfaces of the tools. The present applicant has also proposed a structure in which the number of steps of the seal surface between the tools is increased, or a method of setting the die box position to a wedge-shaped position.

[0009] Generally, a method of removing burrs on the periphery of the rotating wheel or on the groove by using a scraper is used.

[0010]

In the prior arts described above, the use of a scraper can remove burrs relatively well, but is not complete.

Therefore, the problems to be solved by the present invention (objects)
To provide an improved rotary wheel type continuous extruder capable of stably discharging burrs accumulated between a tool between a rotary wheel and a fixed shoe block and suppressing fluctuations in extrusion conditions. It is in.

[0012]

According to the present invention, there is provided a continuous extruding apparatus comprising: a rotating wheel having an endless peripheral groove on an outer peripheral surface; a fixed shoe block having a ridge fitted into the peripheral groove; A transport path for material extrusion formed by a combination of the groove and the jetty, an abutment for closing a rear side of the transport path, and a die for extruding a material supplied to the transport path and subjected to pressure. In the continuous extruder having a, the convex ridge portion on both sides of the circumferential groove of the rotating wheel and the concave ridge portion on both sides of the ridge of the fixed shoe block to form a side seal, A part of the side seal is opened to form a burr discharge part, so that burrs that accumulate in the tool gap formed by the rotating wheel and the fixed shoe block are removed relative to the rotating wheel. By utilizing the pressure generated force is obtained by allowing discharge as from burr discharge portion for opening holes in a portion of the side seal bar state.

Here, the acting force on the burrs generated by the material extrusion is as shown in FIG. That is, the burrs 8 accumulated in the gap between the rotating wheel 1 and the fixed shoe block 3
Receives the driving frictional force in the direction of arrow a accompanying the rotation (v) of the rotating wheel 1 and the resistance frictional force in the direction of arrow b of the fixed shoe block 3. Assuming that these are equivalent areas and the forces are equal, the burr 8 is pushed into the rotating wheel side as indicated by an arrow c at an average value of the speed of the frictional force of the two, that is, half the speed of the rotating wheel 1. Will be.

When the burr discharge portion is formed as a portion for pushing the burr out to the outside by utilizing the pushing force of the burr toward the rotating wheel, the required pressure depending on the opening area of the burr discharge portion is accumulated. Since the contact area of the burr is determined,
It is advisable to provide more flash storage space than this.

As a preferred embodiment, a space for guiding burrs protruding from the burr discharge section may be provided. Further, it is preferable that a mechanism for winding up the burr protruding from the burr discharge unit is provided.

[0016]

FIG. 1 shows an embodiment of a continuous extruder according to the present invention. FIG. 2 is a sectional view of a part A in FIG.
1 shows a cross section of the part B in FIG. 1, and FIG. 4 shows a cross section of the part C in FIG.

In the continuous extruder of this embodiment, an endless circumferential groove 12 is formed at the center of the outer peripheral surface of a rotating wheel 11, and a convex ridge 1 is formed on both sides of the circumferential groove 12.
3, 13 are formed. One fixed shoe block 1
4, a ridge 15 that fits into the circumferential groove 12 is formed in the sliding portion of the rotating wheel 11, and concave ridges 16, 16 are formed on both sides of the ridge 15.

A material transport passage 17 is formed by a combination of the circumferential groove 12 of the rotating wheel 11 and the ridge of the fixed shoe block 14, and an abutment 18 is provided on the inner side of the transport passage 17. Transport passage 1
A die 19 is provided at a portion of a hole formed so as to penetrate from 7 to the outside. Therefore, the material is supplied from the entrance of the transport passage 17 into the passage, receives the pressure required for the extrusion by the frictional force accompanying the rotation of the rotating wheel 11, and
Extrusion molding will be carried out at 9.

Further, the convex bank 1 of the rotating wheel 11
3, 13 and the concave ridge portion 16, 1 of the fixed shoe block 14.
6 and a side seal 20 is formed,
A part of the side seal 20 is opened to form a burr discharge unit 21.
Is formed.

Now, the φ9.5 Al material is transferred to the transport passage 17.
When a predetermined continuous extrusion is performed by supplying the burrs to the rotating wheel 11 and the side seal 20, burrs are generated in a coating form. When the burrs are rotated and pushed into the burr accumulation space, the contact area between the tools is reduced. The burrs were pushed out from the burr discharge unit 21 as a bar-shaped burr 22 at the pressure increase corresponding to the pressure increase. The discharge burr 22 was a continuous rectangular bar having a cross section of 5 × 10 mm.

In this embodiment, although not particularly shown,
A space for guiding the discharge burr 22 was provided, and a mechanism for winding the discharge burr 22 was provided. As a result, the discharge burr 22 can be continuously wound up, so that the operation for discharging the burr as in the related art is unnecessary or troublesome, and the work can be efficiently performed to greatly improve the workability. Was.

In the above embodiment, the discharge burr 22 is discharged as a relatively thick wire, but it is also possible to reduce the opening area of the burr discharge section and to extrude the burr in a narrow cross section. However, the burr accumulation space increases accordingly, and the heat generation and rotational power due to the contact friction with the rotating wheel increase, so that extra energy is used.

On the other hand, when the opening area of the burr discharge portion is increased, the above-described loss of rotational power is reduced, but the burr is not completely filled, and the linear burr is broken during the burr discharge. There is a problem that it is difficult to process smoothly.

The smaller the pressure required for the burr discharge, the smaller the volume of the accumulated burr and the smaller the power loss. Therefore, as shown in FIG. 3 in particular, it is preferable to regard the burr discharge portion as an extrusion die and provide a portion corresponding to the die bearing and a relief portion behind the portion.

In the above-described embodiment, the burr discharge section is provided as a method of treating burrs that cannot be completely removed by the scraper. It is also possible to use a method in which all processing is performed by a unit. In particular, under the condition where the amount of burrs is small, it is effective because the burrs are not bulky and the amount of burrs generated is small.

In the embodiment described above, one wheel 1
Although shown as a rotary wheel type continuous extrusion device having a grooved structure, the present invention can also be applied to a device having a two-wheeled structure or a two-wheeled grooved structure having the same structure.

[0027]

According to the present invention as described above, burrs accumulated between the tool of the rotating wheel and the fixed shoe block can be stably discharged, and fluctuations in extrusion conditions can be suppressed. The desired object (object) of providing an improved rotary wheel type continuous extrusion device can be achieved.

According to the effects of the present invention, the amount of accumulated burrs is excessively increased, and there are no time-varying factors such as insufficient rotation power or an increase in the initial calorific value of processing, and the extrusion conditions are stabilized. The cross-sectional shape of the generated burrs can be made uniform and processing can be facilitated (the conventional apparatus has a danger in processing because the burrs are thin and jagged). In other words, the winding can be smoothly performed by the winding mechanism, and the time for manual operation can be almost eliminated.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of a continuous extrusion apparatus according to the present invention.

FIG. 2 is a cross-sectional view of a portion A in FIG.

FIG. 3 is a cross-sectional view of a portion B in FIG.

FIG. 4 is a sectional view of a portion C in FIG. 1;

FIG. 5 is an explanatory sectional view showing a conventional rotary wheel type continuous extrusion device.

FIG. 6 is a cross-sectional view of a portion A in FIG.

FIG. 7 is a cross-sectional view of a portion B in FIG. 5;

FIG. 8 is an explanatory diagram showing a force acting on a burr accumulated between tools in the rotary wheel type continuous extruder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotating wheel 12 Circumferential groove 13 Convex ridge 14 Fixed shoe block 15 Ridge 16 Concave ridge 17 Transport passage 18 Abutment 19 Die 20 Side seal 21 Burr discharge part 22 Discharge burr

Claims (3)

[Claims] 1. A rotating wheel having an endless peripheral groove on an outer peripheral surface, a fixed shoe block having a ridge fitted into the peripheral groove, and a material extrusion formed by a combination of the peripheral groove and the ridge. And a die for extruding a material supplied to the transport passage and subjected to pressure, the die having an abutment for closing a rear side of the transport passage. A side seal is formed by combining the convex ridges provided on both sides of the groove and the concave ridges provided on both sides of the fixed ridge of the fixed shoe block, and a part of the side seal is opened to form a burr discharge portion. A continuous extrusion device. 2. The continuous extruder according to claim 1, further comprising a space for guiding burrs protruding from said burrs discharging portion. 3. The continuous extruder according to claim 1, further comprising a mechanism for winding up the burr protruding from the burr discharge section.