JPS60210317A - Extrusion device - Google Patents

Abstract

PURPOSE:To obtain an extrusion device capable of easily extruding a billet by constituting the device wherein a billet housed in a container is embedded in a pressure medium excellent in fluidity and a plunger whose cross-sectional shape is approximately equal to that of the billet is used at the time of extruding the billet. CONSTITUTION:A pressurizing plunger is forced into a container 3 in a state of inserting a billet 1 into a pressure medium 2 and housing the entire part of them in the container 3. As a result, the medium 2 staying around the billet 1 is compressed to produce a pressure, and the billet 1 is pressed from its side face. The actuation of a plunger 4 is stopped after the pressure in the container 3 reaches a required value, and a extruding plunger 5 having a cross-sectional shape approximately equal to that of the billet 1 is forced into the container 3 to extrude the billet 1 from a die 6 in a state of pressing only a part of billet 1 staying in the medium 2 from its circumference. At that time, the plunger 4 is held so as to maintain the pressure of the medium 2 staying around the billet 1. In this case, it is favorable when the diameter of billet 1 is approximately equal to that of the plunger 5.

Description

[Detailed description of the invention] The present invention relates to an extrusion device.

When an extrusion process attempts to extrude the material, the material is crushed by the plunger, fills the container, and then breaks as the material is extruded through the die and fills the container. To prevent this, a method was invented in which a liquid is compressed to apply hydrostatic pressure to the billet, and this pressure is used to extrude the billet from a die. However, this method has the disadvantage that the processing temperature is limited to around room temperature, which makes it less useful. In order to further improve this problem, a method was invented in which a billet and a fluid solid pressure medium were filled into a pressure vessel (see Japanese Patent Publication No. 43-26749). Japanese Patent Publication No. 43-26749 discloses an apparatus for carrying out this method in which a removable lid is provided on the plunger side of a pressure vessel. However, when the plunger is pressed into the lid of this device, the pressure generated causes the solid pressure medium to crack, no matter how fluid it is.
It is necessary to increase the pressure on the container wall to a level that does not cause the billet to barrel, but the force acts strongly in the direction of the plunger's movement, causing cracks in the billet before extrusion, especially in the case of brittle materials. There is a problem.

- Developed a new method for extrusion
(Refer to Publication No.-24962).

The essentials of this method are as follows.

As an example of the embodiment is shown in FIGS. 1 to 3, a billet 1 is inserted into a pressure medium 2 and the entire billet is placed in a container
to fit in. In this state, when the pressurizing plunger 4 is pushed into the container 3 as shown in FIG. 2, the pressure medium 2 around the billet 1 is compressed to generate pressure and press the billet from the side.

After the pressure inside the container 3 reaches the required value, when the operation of the external pressure plunger 4 is stopped and the extrusion plunger 5 is pushed in, only the part of the billet 1 in the pressure medium 2 is pushed from the surroundings. It is pushed out from the goose 6. At this time, the pressurizing plunger 4 is held so as to maintain the pressure of the pressure medium around the billet 1 at a required value, as shown in FIG. In this case it is advantageous if the diameter of the billet 1 and the diameter of the extrusion plunger 5 are approximately the same.

In addition, the advantages of the above invention in processing will be described below.The first is that sufficient force is applied from the side of the billet before extrusion force is applied to the billet, so even if extrusion force is applied, the material will not be crushed. (, therefore, destruction in this process can be prevented.

In addition, hydrostatic force acts on the billet due to the force from the side and the extrusion force, increasing the ductility of the material.

Second, since a solid is used as the pressure medium, the energy stored in the container is much smaller than when a liquid or gas is used, and the degree of danger is much lower.

Thirdly, hot working becomes easier.

However, in the above invention, when the cross section of the billet perpendicular to the extrusion direction is not concentric and has a rectangular or ellipsoidal surface, for example,
The shape of the plunger has to be divided into three parts as shown in the example shown in FIG. 4A, which makes the operation during extrusion very complicated and is not practical.

The present invention is an improvement on the conventional device for the purpose of solving the above-mentioned problems, and by matching the cross-sectional shape of the plunger to the cross-sectional shape of the billet, it can be used even in billets that do not have a concentric cross-sectional shape. Furthermore, even if the material is brittle, it can be easily extruded.

In other words, the present inventors have determined that when the cross-sectional shape perpendicular to the extrusion direction of the extruded material is not a simple shape such as a circle or square, but a complex shape such as a magnetic helad core, the shape of the billet should be adjusted as much as possible. The present invention was made possible by the new discovery that extrusion is easier when the shape is similar to that of an extruded material.

The present invention will be explained in more detail with reference to Examples below.

Example: The inner diameter of the container 3 is 75+am, and the outer diameter of the external pressure planter 4 is 75 mm.The inner diameter is 30 mm as shown in FIG.
Using a device having an elliptical shape with a short diameter of 20 mm and an extrusion plunger 5 with the same cross-sectional shape arranged inside it, the pressure medium 2 was machined from pyrofillite) K with an outer diameter of 75+ om and an extruded inner shape. Plunger 5
A second tube having the same shape as the first tube is inserted into the container 3 in advance. The composition of the billet 1 is an iron-aluminum-silicon alloy containing 6% aluminum and 10% silicon, and after heating it together with the cylinder of the pressure medium 2 to 1200°C, it is quickly inserted into a container. A bar of extruded material 10 having the shape and dimensions shown in FIG. 6 was extruded using the apparatus of the present invention.

As a result, a material was obtained that was easier to operate than the three-part plunger shown in FIG. 4 and had a better extrusion surface as shown in Table 1 than when a cylindrical billet was used.

Table 1

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a conventional extrusion device, with one billet
2 pressure medium, 3 containers, 4 booster plungers, 5 extrusion plungers, 6 gooses. Figure #2 is an explanatory diagram showing a state in which the external pressure blanker 4 of Figure 1 is pushed into a container. FIG. 3 is an explanatory diagram showing a state in which the extrusion plunger 5 of FIG. 2 is pushed in to extrude a billet. Fig. 4 is a cross-sectional view of an example of an extrusion device using a three-part pressurizing plunger, in which Fig. A shows a cross section of a part of the plunger, and Fig. B shows a cross section of a billet part. 3 containers, 7-9 three-part plunger. Fig. 5 is a cross-sectional view of an example of an extrusion device using an undivided plunger of the present invention, Fig. 0 shows a cross section of a part of the plunger, and Fig. D shows a cross section of a billet part. , 3 containers, 4 booster plungers, and 5 extruder plungers. Moreover, FIG. 6 shows a cross-sectional view of the extruded material, and is a 10 extruded material. Agent Patent Attorney Takashi Honma Figure 7 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] An extrusion device that embeds a billet housed in a container in a pressure medium made of solid or powder with good fluidity and extrudes it from a die with a plunger, the plunger being divided into an extrusion plunger and a pressure increase plunger, An extrusion device configured such that each plunger can be pushed into a container independently, wherein a cross section of the extrusion plunger perpendicular to the extrusion direction has a shape close to the cross-sectional shape of the billet. Device.