JPH11226631A - Continuous extrusion machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constantly maintain a temp. of an extrusion chamber to a prescribed temp. without using a heat insulation material. SOLUTION: The extruder is provided with a die chamber 12, heating means 15, 16 arranged in tight contact with the die chamber 12 and a case 18 covering the die chamber 12 and the heating means 15, 16. In this case a heat insulation means having a enclosed air heat insulation layer 17 is arranged between the heating means 15, 16 and the case 18, materials 9, 10a continuously supplied to the die chamber 12 are heated with the heating means 15, 16 to be extruded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous extruder for heating and extruding continuously supplied materials.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing a main part of an example of a conventional continuous extruder, and FIG. 4 is a sectional view taken along line AA of FIG. This continuous extruder 1A is a rotary wheel type continuous extruder, and has a configuration in which a movable wheel 1, a die chamber 2, a pressing roll 3a, a scraper 3b, an abutment 4, and the like are attached to a main body 3. The movable wheel 1 is provided with two parallel grooves 1a over the entire outer peripheral surface thereof, and is configured to be rotatable in a direction indicated by an arrow r around a rotation shaft 1b by a driving device (not shown).

The die chamber 2 has an extrusion chamber 2a and a die hole 2b formed therein.
The material is supplied to the extrusion chamber 2a through the abutment 4 that dams the material supplied to the extrusion chamber 2a. On the outside of the die chamber 2, a heating plate 6 in which a heater 5 is incorporated is arranged in close contact therewith, and further covered with a case 8 via a heat insulating material 7. The pressing roll 3a and the scraper 3b
It is arranged on both sides of the movable wheel 1. The pressing roll 3 a presses the wire 10 a against the groove 1 a of the movable wheel 1. The scraper 3b is provided with an acute angle portion at the tip thereof, which comes into contact with the groove 1a of the movable wheel 1, and is configured to be slidable as the movable wheel 1 rotates.

[0004] The continuous extruder 1A having such a configuration is used, for example, when extruding a composite metal wire in which a coating layer of aluminum or the like is formed around a core wire such as a steel wire, or when extruding a single wire such as aluminum. In the following, an operation example when extruding a composite metal wire having a coating layer formed around a core wire will be described. First, the heater 5 built in the heating plate 6 is turned on, and the heater 5 is turned on.
Is transferred to the die chamber 2 which is in close contact with the heating plate 6, and the temperature in the extrusion chamber 2a is heated to a predetermined temperature.

[0005] Next, the movable wheel 1 is rotated, and the core wire 9 is continuously supplied into the die hole 2b in the extrusion chamber 2a by a core wire supply device (not shown).
a into the groove 1a and the movable wheel 1 and the pressing roll 3
a. At this time, the wire rod 10a collides with the abutment 4, but is continuously supplied thereafter, so that the inside of the extrusion chamber 2a is in a high pressure state, and the frictional heat generated between the wire rod 10a and the abutment 4, etc. In addition, the inside of the extrusion chamber 2a becomes hot.

Accordingly, the wire rod 10a receives a large extrusion pressure in the extrusion chamber 2a and is in a semi-molten state, and the coating layer 10 is formed around the core wire 9 and is extruded from the die hole 2b. Then, burrs and the like of the wire rod 10a attached to the groove 1a are removed by the scraper 3b. Here, in order for the wire 10a to be in a semi-molten state, it is necessary to maintain the temperature in the extrusion chamber 2a at a predetermined temperature, but a part of the heat of the heater 5 is transmitted to the case 8 and dissipated into the outside air. Then, the temperature in the extrusion chamber 2a cannot be maintained at a predetermined temperature.

When the temperature in the extrusion chamber 2a falls below a predetermined temperature, the fluidity of the semi-molten wire rod 10a deteriorates, and stable extrusion cannot be performed.
Therefore, the heat insulating material 7 is arranged in close contact between the heating plate 6 and the case 8, thereby preventing heat transfer to the case 8 and maintaining the temperature in the extrusion chamber 2a at a predetermined temperature.

[0008]

However, according to the conventional continuous extruder 1A, since the inside of the extrusion chamber 2a is in a high pressure and high temperature state at the time of extrusion, the die chamber 2 receives a large pressure and the temperature of the die chamber 2 becomes 400. ° C ~ 60
Since the temperature reaches 0 ° C., the die chamber 2 thermally expands greatly. For this reason, a large force is applied to the heat insulating material 7, and there is a problem that the heat insulating material 7 may be cracked. Further, even when the heat insulating material 7 does not crack, the heat insulating material 7 is deteriorated by the repeated load due to the repeated use of the continuous extruder 1A, so that the heat insulating material 7 must be periodically replaced relatively early. There was a problem.

Further, the dimensions of the heat insulating material 7 change due to expansion and contraction of the die chamber 2 and frictional wear with the die chamber 2, so that there is a problem that the mounting position of the die chamber 2 changes. Further, there is a problem that the generated wear powder of the heat insulating material 7 contaminates the die chamber 2 and the like.

On the other hand, as described in Japanese Patent Application Laid-Open No. 7-60343, a continuous extruder without a heat insulating material and having a gap between a heating plate and a case has been proposed. Since the heater is connected to the outside, a part of the heat of the heater is transmitted through the air gap and dissipated into the outside air, so that it is difficult to maintain the temperature inside the die at a predetermined temperature.

Accordingly, it is an object of the present invention to provide a continuous extruder capable of always maintaining the temperature in an extrusion chamber at a predetermined temperature without using a heat insulating material.

[0012]

In order to achieve the above object, the present invention comprises a die chamber, heating means arranged in close contact with the die chamber, and a case for covering the die chamber and the heating means, In a continuous extruder for heating and extruding a material continuously supplied to the die chamber by the heating means, a heat insulating means having a sealed air heat insulating layer is provided between the heating means and the case. The present invention provides a continuous extruder characterized by the following.

[0013] According to the above configuration, a heat insulating effect is provided by the sealed air layer, so that a heat insulating material becomes unnecessary.
The operation of replacing the heat insulating material and various adverse effects caused by the heat insulating material, such as a change in the mounting position of the die chamber and contamination can be eliminated.

[0014]

FIG. 1 is a side view showing a main part of an embodiment of a continuous extruder according to the present invention, and FIG.
FIG. 3 is a sectional view taken along line A. This continuous extruder 11A is a rotary wheel type continuous extruder, and has a configuration in which a movable wheel 11, a die chamber 12, a pressing roll 13a, a scraper 13b, an abutment 14, and the like are attached to a main body 13.

The movable wheel 11 is provided with two parallel grooves 11a over the entire outer peripheral surface thereof, and is configured to be rotatable in a direction indicated by an arrow r around a rotating shaft 11b by a driving device (not shown). ing. Die chamber 12
Has an extrusion chamber 12a and a die hole 12b formed therein, and the abutment 14
a. Die chamber 12
A heating plate 16 (heating means) in which a heater 15 is incorporated is disposed in close contact with the outside of the case, and is further covered with a case 18.

A plurality of recesses 17a and 17b are provided on each of the opposing surfaces of the heating plate 16 and the case 18, and the insulation means having a plurality of air insulation layers 17 sealed by the recesses 17a and 17b. Are formed. A high-reflection plate 19 made of a material having a high thermal reflectance, for example, aluminum, is attached to the low-temperature side surface of each air insulation layer 17, that is, the inner surface of the concave portion 17 b provided in the case 18. High temperature side,
That is, the concave portion 1 provided in the heating plate 16
A low radiation plate 20 made of a material having a low thermal emissivity, for example, aluminum, is attached to the inner surface of 7a and the outer surface of the case 18 which comes into contact with the outside air.

The continuous extruder 11A having such a configuration is used, for example, when extruding a composite metal wire in which a coating layer such as aluminum is formed around a core wire such as a steel wire, or when extruding a single wire such as aluminum. But below,
An operation example when extruding a composite metal wire having a coating layer formed around a core wire will be described. First, heating plate 1
6 is turned on, and the heater 15 is turned on.
Is transferred to the die chamber 12 which is in close contact with the heating plate 16, and the temperature in the extrusion chamber 12a is heated to a predetermined temperature.

Next, the movable wheel 11 is rotated, and the core wire 9 is continuously supplied into the die hole 12b in the extrusion chamber 12a by the core wire supply device (not shown), and the two wire rods 10a are grooved. 11a, and is continuously supplied by the friction supply force between the movable wheel 11 rotating in the opposite direction and the pressing roll 13a. At this time, the wire rod 10a collides with the abutment 14, but is continuously supplied thereafter, so that the inside of the extrusion chamber 12a is in a high pressure state, and the frictional heat generated between the wire rod 10a and the abutment 14, etc. In addition, the inside of the extrusion chamber 12a becomes hot.

Therefore, the wire 10a receives a large extruding pressure in the extrusion chamber 12a and is in a semi-molten state.
A coating layer 10 is formed around the core wire 9 and extruded from the die hole 12b. Then, the wire rod 1 attached in the groove 11a
Burrs and the like of 0a are removed by the scraper 13b. Here, the air insulation layer 17 is formed between the heating plate 16 and the case 18.
Since the heat conductivity of the air in 7 is smaller than the heat conductivity of the metal which is the material of the heating plate 16 and the case 18, it is possible to prevent a part of the heat of the heater 15 from transferring to the case 18. it can.

The high-reflection plate 19 is attached to the inner surface of the air-insulating layer 17 on the case 18 side. 18 can be reduced.
Further, the low radiating plate 20 is attached to the inner surface of the air heat insulating layer 17 on the heating plate 16 side and the outer surface of the case 18, and the low radiating plate 20 has a small heat radiation rate. Radiation to some cases 18 and heat radiation from the case 18 to the outside air can be reduced.

Accordingly, since the temperature in the extrusion chamber 12a can be constantly maintained at a predetermined temperature, the fluidity of the wire 10a in a semi-molten state can be kept good, and stable extrusion can be performed. It is possible to prevent the die chamber 12 and the like from being damaged due to an abnormal increase in the pressure in the inside 12a. Further, since the time for raising the temperature in the extrusion chamber 12a can be shortened, extrusion can be performed economically and efficiently. Furthermore, since the capacity of the heater 15 can be minimized, the power consumption of the continuous extruder 11A can be reduced.

Further, since no heat insulating material is used, the work of replacing the heat insulating material, which has been required conventionally, is not required, so that the maintenance man-hour of the continuous extruder can be reduced.
And since the mounting position of the die chamber does not change,
The dimensional variation of the extruded product does not occur, and the dimensional accuracy of the extruded product can be improved. Furthermore, since no abrasion powder of the heat insulating material is generated, the quality of the extruded product can be improved.

In the above-described embodiment, the air heat insulating layer 1
7, a high reflection plate 19 made of aluminum is attached to the inner surface of the case 18 side, and a low radiation plate 20 made of aluminum is attached to the inner surface of the air insulation layer 17 on the heating plate 16 side and the outer wall surface of the case 18. But high reflection plate 1
The material 9 is not limited to aluminum as long as it is a material having a large heat reflectance, and the material of the low radiation plate 20 is a material having a small heat radiation.

The inner surface of the air insulation layer 17 on the case 18 side is mirror-finished to replace the high reflection plate 19, or the inner surface of the air insulation layer 17 on the case 18 side is coated with a paint having a high thermal reflectance. The high reflection plate 19 may be used instead. Similarly, a paint having a low thermal emissivity may be applied to the inner surface of the air insulation layer 17 on the heating plate 16 side and the outer wall surface of the case 18 to replace the low radiation plate 20.

[0025]

As described above, according to the present invention, the temperature in the extrusion chamber can be constantly maintained at a predetermined temperature without using a heat insulating material. Further, since the sealed air heat insulating layer is provided between the heating means and the case, long-term stable operation can be performed without replacing parts.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an embodiment of a continuous extruder of the present invention.

FIG. 2 is a sectional view taken along line AA of a main part of the continuous extruder of FIG.

FIG. 3 is a side view showing a main part of an example of a conventional continuous extruder.

FIG. 4 is a sectional view taken along line AA of a main part of the continuous extruder of FIG.

[Explanation of symbols]

 9 core wire 10 coating layer 10a wire rod 11A continuous extruder 11 movable wheel 11a groove 12 die chamber 12a extrusion chamber 12b die hole 13 main body 13a pressing roll 13b scraper 14 abutment 15 heater 16 heating plate 17 air insulating layer 17a recess 17b recess Case 19 High reflection plate 20 Low radiation plate

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hiroshi Yamanobe 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Power Systems Research Laboratory, Hitachi Cable, Ltd.

Claims (4)

[Claims] 1. A die chamber, a heating means arranged in close contact with the die chamber, and a case covering the die chamber and the heating means, wherein a material continuously supplied to the die chamber is heated by the heating means. A continuous extruder for extruding by heating according to (1), wherein a heat insulating means having a closed air heat insulating layer is provided between the heating means and the case. 2. The continuous extruder according to claim 1, wherein the heat insulating means has a high reflection portion made of a material having a high heat reflectance on a low temperature side of the air heat insulation layer. 3. The continuous extruder according to claim 1, wherein the heat insulating means has a low radiating portion made of a material having a low thermal emissivity on a high temperature surface side of the air heat insulating layer. 4. The continuous extruder according to claim 1, wherein the heat insulating means is formed by a concave part provided in the heating means and a concave part provided in the case.