JPS606220A - Rotary type continuous extruder for metal - Google Patents

Abstract

PURPOSE:To reduce the waiting time until extrusion is started by providing an electrode to an extruding tool in which a die is housed and conducting electricity directly to said electrode with the extruding tool as a resistor. CONSTITUTION:An electrode 7 formed of a material having small electric resistance is attachably and removably bolted directly to the outside of an extruding tool 6 and is further connected to connecting plates 13 supported via insulating plates 12 to support blocks 11 fixed to both side faces of a shoe 3. The plates 13 are connected by a cord to a secondary voltage transformer 14. When electricity is conducted from a power source for heating a die to the electrode 7, the electrode 7 heats a die part 5 with the extruding tool as a resistor. The heating temp. is measured by a thermocouple inserted to the tool 6. When the die is heated to a required temp. the power source is turned off and immediately a wheel 2 is started and 1-2 pieces of short-sized blank materials are inserted into the die. The blank materials are continuously supplied thereto after the start of extrusion is confirmed and the continuous extrusion is thus accomplished.

Description

[Detailed description of the invention] This invention relates to improvements in rotary continuous metal extrusion equipment.

As shown in the conceptual diagram of FIG. 1, the rotary continuous metal extrusion device includes a rotating wheel (v2) having an outer circumferential groove 1, a fixed shoe 3 that covers a part of the outer circumferential groove 1 to form a passage, and a fixed shoe 3 that covers a part of the outer circumferential groove 1 to form a passage. An abutment Φ is provided at the end of the shoe 3 and fits into the outer circumferential groove l of the wheel 2 to close one end of the passage; It has an extrusion die 5 that opens into the passage, and when the wheel L/2 is rotated and the material is fed from the opening side of the passage, the material receives a propulsive force due to contact friction with the inner surface of the passage. It can be advanced in the passage to the hand of abutment 4.

Furthermore, since the material is continuously supplied, the material at the front of the abutment 4, that is, the innermost part of the passage, is pressurized by the suppression of the subsequent material, and reaches a pressure that allows it to be deformed, and is extruded from the extrusion die 5 as a product. .

In such a rotary continuous metal extrusion apparatus, after the start of operation, the apparatus parts and materials are heated to fi00 mainly due to friction suction.
High temperatures exceeding ℃ occur.

This means that the temperature gradient is large since the operation starts at normal temperature, and when extruding hollow shapes and hollow products, the extrusion resistance of the die is large.1 The generated heat is transferred to the equipment side. Due to reasons such as being taken away by the metal, it took a considerable amount of time to start extrusion, that is, to heat (preheat) the die.

Further, since a large pressure is applied to the extrusion tool, there is a drawback that the tool is deformed or damaged in the early stage of extrusion.

As a countermeasure against these problems, it has already been proposed to preheat the die before starting extrusion, but as mentioned above, since the volume of the equipment is large, heat is taken away by the equipment, and the heating time and heating temperature are insufficient. The heating power is strong) ivy.

Another option is to put only the die part between the furnace, preheat it, and then assemble it in the shoe and extrude it, but there are problems with the hand link and the temperature reduction tube of the die during operation. It was never the preferred means of heating.

The present invention has been made in view of the above, and is provided with an electrode on an extrusion tool that houses a die, and directly energizes the electrode using the extrusion tool as a resistor to heat the die part and wait time until extrusion starts. This is an attempt to shorten the . The following description will be made based on the embodiment shown in FIGS. 2 and 3, and the same parts and functions as those of the conventional type explained in FIG.

In an extrusion device in which an extrusion tool 6 housing a die 5 is incorporated into a shoe 3 that covers a circumferential groove 1 of a rotating wheel /l/2 to form a passage, a material such as copper or the like is directly applied to the outside of the extrusion tool 6. An electrode 7 made of a material with low electrical resistance, such as a material such as a material having low electric resistance, is attached removably through a connecting plate 10, and is further supported by an insulating plate I2 on a support block 11 fixed to both sides of the shoe 3. 13 and connected to the secondary transformer 14 through a connecting cord.

FIG. 4 shows an example of a detailed view of the main parts and a wiring diagram of FIG. 2, in which 15 is a power supply and 16 is a switch.

1? is the primary transformer with voltage regulator, 18 is e in the extrusion tool 6
The inserted thermocouple 19 is a thermocouple thermometer.

The structure of the present invention is as above, and its operation will be explained next.

As a pre-extrusion operation, when the die heating power source 15 is first turned on, the electrode 7 connects the extrusion tool 6 with a resistor and heats the die portion. If there is a possibility that the pole 10 that tightens the electrode 7 may loosen due to this heating, as shown in FIG. 20 may be crimped through the insulating plate 8 and the pressing plate 9, or as shown in FIG.
The electrode 7 may be crimped onto the extrusion tool 6 via the insulating plate 8 and the pressing plate 9 by means of the insulating plate 8 and the pressing plate 9. The die heating temperature is measured by a thermocouple 18 inserted into the extrusion tool 6.
97. will be displayed. When the die temperature reaches the required extrusion temperature (approximately 300°C in this example), turn off the power and immediately turn off the wheel/l/2
After starting up and inserting one or two short materials and confirming the start of extrusion, continuous extrusion is performed by supplying short materials or continuous months S.

Figure 7 is a chart for extruding a product from room temperature while rotating the foil using a conventional device, and Figure 8 is a chart for extruding the same product using the device of the present invention.
・This is an example, but as is clear in this example, the extrusion start time is shortened by a wide range, and although not shown in the figure, the initial shoe reaction force and shaft As a result of the smaller torque and thus the initial pressure applied to the die, which is reduced by a large amount, the tool design is significantly improved, which is extremely advantageous for cost reduction.

In addition, in order to enhance the die heating effect, the extrusion tool 6 and electrode 7
and a resistor 2 such as carbon plate 1]
It is preferable to incorporate. FIG. 4 shows an embodiment in which this resistor 21 is incorporated.

Also, in the above explanation, when the Gui temperature reaches the desired temperature,
We have decided to turn off the electricity for heating, but when using materials with low processing heat generation such as powder materials, the voltage regulator is controlled by the signal from the thermocouple thermometer, and the electricity is constantly turned on even during extrusion work. It may be heated to maintain a preferred goo temperature.

[Brief explanation of the drawings] Fig. 1 is a conceptual diagram of a conventional device, and Fig. 2 is a conceptual diagram of a conventional device.
Figure 3 is a plan view, Figure 4 is a detailed view of the main parts of Figure 2, and wiring diagram Figure 5 is an example of the structure on the electrode plate side. FIG. 6 shows a modified embodiment of FIG.
The figure shows an extrusion start curve diagram of a conventional device, and FIG. 8 shows an extrusion start curve diagram according to the present invention. 1... Circumferential groove 2... Rotating wheel/l/ 3... Shoe 41... Abutment tool? ...Wi pole 8,]2...Insulating plate 9...
・Extrusion plate 10, 10'...Bolt 1''...Support block 13...Connection plate 14...Secondary transformer 15...
・Power supply applicant Sumitomo Heavy Industries, Ltd. sub-agent Patent attorney Isamu Ohashi 9 -

Claims (1)

[Claims] A rotary continuous metal extrusion device characterized in that an extrusion tool housing a die is provided with an electrode, and the extrusion tool is used as a resistor to directly energize the electrode.