JPS5940113Y2 - Metal extruder using long coil - Google Patents

Description

[Detailed description of the invention] This invention is a metal extrusion process using a long coil for the purpose of preventing air from getting caught in the product by reducing the pressure inside the container, which consists of a shoe, a die, and a grooved wheel. It's about machines.

Conventional metal extruders supply stock into a shoe and rotate a grooved wheel to push the material out of a die to form the bottom shape. Because of this problem, the product is usually forced to cool with water at the exit of the die to seal the air bubbles in the product so that no defects are visible on the surface.

However, it goes without saying that even if the air bubbles cannot be seen on the surface, the presence of air bubbles is not desirable in itself.

However, the present invention solves the above-mentioned conventional problems by reducing the pressure inside the shoe and isolating the material just before extrusion from the outside world, thereby eliminating any deterioration in quality due to the inclusion of air bubbles.

In other words, in this invention, the inside of the container is 0.1 Torr to 0.02 Torr.
Although the entrainment of bubbles was substantially reduced by reducing the pressure to about -100 ml, the following two cases can be considered when implementing this method.

One example is a case in which the main body of the extruder is placed in a sealed chamber, excluding the material and drive bearing parts, and the entire body is depressurized.
The other method is to use the space inside the container as a closed room and directly reduce the pressure in the space.

Regarding the former, there are cases in which the drive part is also placed in a sealed chamber, and only the material population and product exit are sealed off, and there is also a case in which the drive part is placed outside the sealed room, the die is also exposed, and the sealed chamber is used as the material inlet. In some cases, the penetration part of the drive shaft is sealed.
The embodiment shows a structure in which the die is exposed.

Next, the present invention will be explained with reference to the embodiment shown in FIG.

A cover plate 2, 2a is provided on the outside of the frame 1, 1a surrounding the container consisting of the shoe, die and grooved wheel of the extruder.
2b and 2c to form a sealed chamber 3, a cylindrical part 4 is provided on the cover plate 2c on the artificial side of the material, and an annular protrusion 5, as shown in FIG. 5a to provide compartments 6, 6a, connect and open husbandry exhaust pipes 7, 7a to the walls of each compartment, and connect the exhaust pipes 7.7a to the suction side of a vacuum pump (not shown). An example of the sealed chamber 3 also has an exhaust pipe 8 connected thereto.

Further, a sealing lid 9 is provided on the drive shaft 10 passing through the frame 1a.
Attach the O-ring 1 between the drive shaft 10 and the seal lid 9.
The cover plate 2a exposes the die 12, and the shoe, the frame 1, 1a and the cover plate 2, 2b are interposed and sealed.
Since the space is sealed, the die can be replaced without opening the sealed chamber.

Next, the embodiment shown in FIG. 5 attempts to reduce the pressure only inside the shoe 20.

That is, a cylindrical inlet 13 is provided on the material charging side of the shoe 20, and ridges 14.14a and 14b are provided on the inside of the cylindrical insert 13 to form an annular groove 15.15a.

15b, and a vacuum pump (
(not shown) with exhaust pipes 16.16a and 16b.

Further, a protrusion 19 is provided on the shoe 20 corresponding to the groove 18 of the wheel 17, and this protrusion is inserted into the groove 18.

In this way, airtightness can be maintained on the artificial side of the material by the exhaust in each annular groove, and by contact between the shoe 20 and the grooved wheel. Because of this, airtightness is maintained, and in the end, shoe 2
0. The inner end of the container consisting of wheel 17 and die 12 is sealed and under vacuum.

Therefore, the risk of air bubbles being drawn into the surface of the product during extrusion molding is prevented.

Parts where air is likely to enter, such as the material charging port, can be reliably sealed by interposing a multi-stage sealing device.

In the embodiment described above, the material 21 is charged through the cylindrical stem 13 of the shoe 20, drawn into the container as the grooved wheel rotates, heated to the extrusion temperature by frictional heat, and pressed against the die 12. , die 1
A continuous product 22 is molded and extruded from the extrusion hole 2.
becomes.

The material mentioned above is generally a wire rod wound into a coil shape, which is straightened by a straightening machine and then charged into a container.

The material is thus fed continuously.

Of course, even if the material is supplied in the form of rods of predetermined lengths, there is no substantial difference from the case of long wire rods if the material is continuously charged, and long products can be continuously formed. .

It goes without saying that the desired cross-sectional shape of the product can be obtained by the die, and there is no fear that it will be influenced by the device of the present invention.

Further, the higher the degree of vacuum, the smaller the amount of air that is drawn in, but it is considered that in practical terms, the amount is about 0.1 Torr to 0.02 Torr.

That is, according to the present invention, since the internal space where the material is extruded is depressurized, it is possible to prevent air bubbles from being drawn into the product during extrusion molding, and the efficiency is increased by installing the device of the present invention. There is no risk of any decline or other disadvantages.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention in which an airtight chamber is provided on the outside of the container and the container is placed inside, a side view with some parts omitted, Figure 2 is a front view, and Figure 3 is the same material population. 4 is a partial sectional view of the drive shaft section, FIG. 5 is a side view of an embodiment of the present invention in which only a portion of the shoe is made airtight, and FIG. 6 is the relationship between the shoe and the wheel. FIG. 7 is a sectional view of the shoe and wheel. 1, 1 a...Frame, 2, 2a, 2
b, 2c...covering plate, 3...closed chamber, 4
...... Cylindrical part, 5,5a... Annular protrusion,
6,6a... Ward farm room, 7.7a. 8...Exhaust pipe, 9...Seal lid, 10
... Drive shaft, 12 ... Die, 13 ...
...Tubular population, 14.14a, 14b...
・Annular protrusion, 15.15 a, 15 b ”-・Annular groove, 16.16a. 16b...Exhaust pipe, 17...Wheel, 18...Wheel Groove, 20... Shoe, 21... Material, 22... Product.

Claims (1)

[Scope of utility model registration request] 1. In a metal extruder that supplies stock into a shoe and rotates a grooved wheel to extrude material from a die to form a bottom shape, the inside of the container consisting of the shoe, die and grooved wheel is depressurized. Alternatively, a metal extruder using a long coil, characterized in that the outside of the container is a sealed chamber, and an exhaust device is connected to one example of the sealed chamber. 2. A metal extruder using a long coil according to claim 1 of the utility model registration, characterized in that the inside of the container is a sealed chamber. 3. A metal extruder using a long coil according to claim 1 of the utility model registration claim, characterized in that a container is housed in a sealed chamber. 4. A metal extruder using a long coil as claimed in claim 2, which is a utility model registration, characterized in that the stocking section of the container is divided into a plurality of chambers, and each chamber is provided with an exhaust port.