JPH022488Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Industrial Field) The present invention relates to an improvement in a rotating wheel type composite product continuous extrusion device.

(Prior art) The principle of extruding composite products in a rotating wheel type continuous metal extrusion device is as shown in Fig. 1, a rotating wheel 2 equipped with a circumferential groove 1 and a material transport passage covering a part of the circumferential groove 1. an abutment 4 that fits into the circumferential groove 1 and closes the passage; and an extrusion die that is provided on the abutment 4 or the fixed shoe 3 and that opens into the passage in front of the abutment 4. 5 and a nipple 6 for supplying and guiding the core wire 15' to the die hole, and extruding a composite product from the extrusion die 5 by supplying the material 15 to the passage opening side of the rotary wheel 2 is conventionally known. .

In such a rotary continuous metal extrusion device, this is due to the frictional resistance between the material and the circumferential groove 1, but since the operation is normally started at room temperature, the heat generated by friction is taken away by the device. It takes a considerable amount of time to heat the die using the generated heat until extrusion begins. Therefore, it has already been proposed to preheat the die before starting extrusion, but since the volume of the device is large, heat is taken away by the device, and sufficient heating cannot be achieved in terms of heating time and heating temperature.

Alternatively, a method can be considered in which only the die portion is placed in a heating furnace, preheated, and then assembled into a fixed shoe and extruded, but this poses problems such as handling problems and a drop in temperature of the die during operation.

Particularly when such an extrusion device is applied to the production of composite products, the distance from the circumferential groove to the die position increases due to the tool configuration, which further exacerbates the above problem.

(Problems to be Solved by the Invention) The object of the present invention is to improve these conventional problems and provide a continuous rotary metal extrusion device suitable for manufacturing composite products.

(Means for solving the problem) A rotary wheel provided with a circumferential groove, a fixed shoe that covers a part of the circumferential groove to form a material transport passage, an abutment that fits into the circumferential groove and closes the passage, and In an extrusion device consisting of an extrusion die that opens into the passage in front of the abutment and a nipple that supplies and guides the core wire to the die hole, one or more pairs of electrodes are arranged on both sides of a shoe block that houses the die, nipple, etc. and connecting the electrode to a power source via a transformer and a voltage regulator,
The present invention is characterized in that an arithmetic unit that processes an output signal from a thermocouple attached to an extrusion tool and a set value signal of a temperature setting device is connected to the voltage regulator.

(Embodiments of the invention) Hereinafter, the embodiments shown in the drawings will be described.
Figures 3 and 4 show an embodiment in which the present invention is applied to a composite product extrusion device using two movable wheels. It has a circumferential groove 1. This 2
A shovel block 3 housing an extrusion tool (die 5, nipple 6) is disposed between two rotating wheels 2, 2. These devices are similar to the conventional device shown in FIG.

In the extrusion device of the present invention constructed as described above, the electrode 7 is positioned so as to sandwich the tool storage portion of the shovel block 3 and is pressed against the holding plate 8 through the bolt 9. This electrode 7 is a transformer 10
and is connected to a power source 12 via a voltage regulator 11. Further, a temperature monitoring thermocouple 13 is provided near the die 5, the output signal of which is input to the arithmetic unit together with the set value signal of the temperature setting device, and the output signal of the arithmetic unit 14 is input to the voltage regulator 11. It is becoming more and more common.

(Function) When extruding a composite wire using the device configured as described above, first turn on the tool heating power source 12, adjust the voltage regulator 11, and use the resistance between the electrodes. The vicinity of the die 5 is heated using a direct current method (monitored by thermocouple).

When the die temperature reaches the temperature required for extrusion, the power is turned off, and the material 15 is supplied while rotating the foil 2 to extrude the product 16.

Note that even during operation, the temperature near the die may decrease due to heat transfer to the shovel block body, etc. In such a case, it goes without saying that electricity should be constantly turned on while monitoring the temperature during operation.

(Effects) The greatest feature of the present invention is that it is possible to realize an extrusion process in which the temperature near the die is intentionally higher than the temperature of the material 15 in the rotating wheel 2 during continuous extrusion, so the extrusion process force can be greatly reduced. This makes it possible to extrude composite products with small amounts of power.

Furthermore, reducing the extrusion force also reduces the pressure applied to the tool, which is extremely advantageous in terms of tool design.

Furthermore, the pressure generated in the rotating wheel part can be reduced by heating the vicinity of the die, and there is no need to consider the heat transfer of the heat generated in the wheel part to the tool part, so it is less than necessary. It becomes unnecessary to generate heat in the wheel section. As a result, the pushing force at the rotating wheel section decreases,
Reducing the processing temperature effectively reduces the occurrence of burrs between the rotary wheel 2 and the fixed tool, making it possible to extrude with a high yield even when extruding composite products with complex tool configurations, improving productivity and handling. This has the effect of greatly improving the situation.

In addition, although the above description describes an example in which the present invention is applied to a composite product extrusion device using two rotating wheels, the present invention is not limited to this, and can also be applied to a composite product extrusion device using a single rotating wheel. Needless to say, the same can be applied as above.

[Brief explanation of the drawing]

1 and 2 are schematic side sectional views of a 1-rotation wheel and a 2-rotation wheel for explaining the principle of extruding a composite product. FIG. Figure 4 is the − of Figure 3.
It is a side sectional view along a line. In the figure: 1 circumferential groove, 2 rotating wheels, 3 shoe blocks, 4 abutments, 5 extrusion die, 6
Nipple, 7 electrodes, 8 holding plates, 9 volts, 10 transformers, 11 voltage regulators, 12 power supplies, 13 thermocouples,
14 computing units, 15 materials, 15' core wires, 16 products.

Claims (1)

[Scope of utility model registration request] A rotating wheel having a circumferential groove, a fixed shoe that covers a part of the circumferential groove to form a material transport passage, an abutment that fits into the circumferential groove and closes the inner part of the passage, and In an extrusion device consisting of an extrusion die that opens into the passageway and a nipple that supplies and guides the core wire to the die hole, one or more pairs of electrodes are arranged on both sides of a shoe block that houses the die and nipple, and the electrodes are connected to the extrusion device. It is connected to a power source via a transformer and a voltage regulator, and a computing unit that processes an output signal from a thermocouple attached to the Shublock and a set value signal of a temperature setting device is connected to the voltage regulator. A rotating wheel type continuous extrusion device for composite products.