JPH08155536A - Extruder - Google Patents

Abstract

PURPOSE: To surely execute an opening action of a valve for deaeration disposed to face a billet in a container liner by energizing this valve for deaeration in such a manner that the valve can be opened by energizing means, such as spring or cylinder. CONSTITUTION: The air A interposed between the billet B and the container liner 3 is removed into a vacuum tank 18 through deaeration holes 14, 15, 16 and a pipe 20 when a solenoid valve 17 is opened. A valve seat 8 comes into tight contact with a valve head 71 of the valve 7 for deaeration by overcoming the spring force of the valve spring 12 and the valve 7 for deaeration closes when a stem 4 is advanced toward an arrow C and is upset by a main cylinder. The solenoid valve 17 is closed at the point of the time when the upset ends. Further, an extrusion material (b) having the prescribed sectional shape is extruded from the die 5 when the stem 4 advances toward the arrow C. The valve 7 for deaeration is automatically released from the valve seat 8 when the stem 4 is retreated toward arrow C' after the end of the extrusion operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruder, and more particularly to an extruder in which a deaeration valve is openably urged by urging means such as a valve spring or a cylinder.

[0002]

2. Description of the Related Art When extruding an extruded material having a predetermined cross-sectional shape from a die, in order to prevent the trapping of air bubbles, the air present between the billet and the container liner before or during upset is set. It has been proposed to extract (see British Patent Application Publication No. 2232107 (1990)).

[0003]

However, the extruder described in this specification is a so-called "opening operation" in which the valve adopted for extracting the air interposed between the billet and the container liner is opened. Since it depends on the adhesive strength of the billet and the valve, when removing the remaining billet together with the die from the container after the extrusion work,
There is no guarantee that the valve will open reliably.

Particularly, recently, since a release agent is applied to the end face of the billet, it is difficult to open the valve by utilizing the adhesive force between the billet and the valve. Even if the valve can be opened by the billet, if some external force acts on the valve during idle time to close the valve, the valve cannot be opened again. There is a possibility that the air existing between the billet and the container liner cannot be removed.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to provide a highly reliable extruder capable of surely performing the opening operation of the degassing valve. To provide.

[0006]

That is, the extruder according to the present invention is an extruder in which a degassing valve is arranged so as to face a billet filled in a container liner, and the degassing valve is a spring or a cylinder. It is characterized in that it is urged so as to be opened by urging means such as.
In the present invention, it is desirable to open the degassing passage in the valve seat corresponding to the degassing valve.

[0007]

As described above, the deaeration valve provided so as to face the billet in the container liner is urged to be opened by the urging means such as a spring or a cylinder so that the deaeration valve can be opened. It can be done reliably.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a direct type extruder. The extruder 1 presses a billet B filled in a container liner 3 with a stem 4 so as to be concentric with the container liner 3 and the front surface of the container 2. An extruded material (product) b having a predetermined cross-sectional shape is extruded from the die 5 disposed in the. Reference numeral 6 indicates a platen.

The stem 4 has a bell-shaped head portion 41, that is, a truncated cone-shaped valve head 71 and a cylindrical valve body 72.
Is equipped with a degassing valve 7. The deaeration valve 7 slides in the longitudinal direction of the stem 4, that is, in the axial direction. Reference numeral 8 is a conical valve seat provided on the stem head 41, and is in close contact with the valve head 71 of the degassing valve 7.

Further, the stem body 42 is provided with a push rod 10 having a collar-shaped or flange-shaped spring receiving portion 9. The push rod 10 slides in the axial direction of the stem 4. Then, the push rod 10 is pushed toward the deaeration valve 7 by the valve spring 12 arranged in the spring chamber 11 of the stem rear portion 43, and always urges the deaeration valve 7 to be opened. .

On the other hand, a degassing hole 13 is provided at the tip of the stem body 42 concentrically with the push rod 10. A plurality of degassing holes 14 provided in the stem head portion 41 communicate with the degassing holes 13 so as to open to the valve seat 8. Here, when attempting to degas from the gap between the stem head 41 and the valve body 72, it is necessary to make the valve body 72 thin or to cut a groove on the outer peripheral surface of the valve body 72, which makes the work troublesome.

Further, at the center of the push rod 10,
A degassing hole 15 is provided in the axial direction. One end of the deaeration hole 15 communicates with the deaeration hole 13, and the other end communicates with the spring chamber 11.
In addition, the stem rear portion 43 is connected to communicate with the spring chamber 11.
A pipe 20 in which an electromagnetic valve 17, a vacuum tank 18, and a vacuum pump 19 are connected in this order is connected to the deaeration hole 16 provided in the.

Next, the operation of the extruder will be described. As shown in FIG. 1, before the upset, the valve head 71 of the degassing valve 7 is separated from the valve seat 8 by the spring force of the valve spring 12 contained in the spring chamber 11, and the billet B and the container liner are separated. The gap 21 between the holes 3 communicates with the spring chamber 11 through the deaeration holes 14 and 13 of the stem 4 and the deaeration hole 15 in the push rod 10.

Therefore, when the solenoid valve 17 is opened, the billet B is
The air A present between the container liner 3 and the container liner 3 is extracted into the vacuum tank 18 through the deaeration holes 14, 15, 16 and the pipe 20. Then, the stem 4 is advanced in the direction of the arrow C by a main cylinder (not shown) to be upset, and as shown in FIG. Close to 71, the degassing valve 7 is closed. Then, the solenoid valve 17 is closed when the upset is completed.

Further, when the stem 4 advances in the direction of arrow C, the extruded material b having a predetermined sectional shape is extruded from the die 5. When the stem 4 is retracted in the direction of the arrow C ′ after the pushing operation is completed, the degassing valve 7 is automatically opened from the valve seat 8 by the spring force of the valve spring 12, as shown in FIG. 1.

FIG. 3 is a sectional view of the indirect extruder.
To avoid duplication, only the differences from the direct extruder will be described. The same parts as those of the direct extruder are designated by the same reference numerals. In the indirect extruder 1a, the die 5 is arranged on the front surface of the fixed stem 4, and the moving cross head 22,
The extruded material b is pushed out from the die 5 by advancing the lid member 24 and the container 2 in the direction of arrow D.

The deaeration valve 7 and push rod 10 are slidably provided on the moving cross head 22. The valve spring 12 is arranged in a spring box 23 attached to the rear part of the moving cross head 22, and the valve seat 8 is provided on a lid member 24 attached to the front surface of the moving cross head 22.

The deaeration hole 14 opening in the valve seat 8 is
A pipe 20 that connects the solenoid valve 17, the vacuum tank 18, and the vacuum pump 19 is communicated with each other through a degassing hole 25 provided in the moving cross head 22. Then, after the air A present between the billet B and the container liner 3 is removed, the moving cross head 22 and the lid member 2 are removed.
4 and the container 2 are advanced in the direction of the arrow D and upset, as shown in FIG.
Close to the valve seat 8 and the deaeration valve 7 is closed.

After the pushing operation is completed, the moving cross head 22, the lid member 24 and the container 2 are returned in the direction of the arrow D ', and as shown in FIG. 3, the deaeration valve 7 is opened by the spring force of the valve spring 12. It is automatically released from the seat 8. In the above description, the opening operation of the degassing valve 7 is automatically performed by the valve spring 12, but the opening operation of the degassing valve 7 is automatically performed by the urging means such as a cylinder. Is also good. Further, the deaeration work for extracting the air A existing between the billet B and the container liner 3 may be performed during the upset.

[0020]

As described above, according to the present invention, in an extruder in which a degassing valve is arranged facing a billet filled in a container liner, the degassing valve is provided with a valve spring or a cylinder. Since the biasing means biases the valve so that it can be opened, the deaeration valve can be surely opened.

Therefore, although the quality and the productivity of the product are improved, the reliability of the extruder has been remarkably improved as compared with the conventional one. Further, in the present invention, since the degassing passage is opened in the valve seat corresponding to the degassing valve,
Making degassing valves easier.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a direct extruder according to the present invention.

FIG. 2 is an operation explanatory view of the extruder according to the present invention.

FIG. 3 is a cross-sectional view of an indirect extruder according to the present invention.

FIG. 4 is an operation explanatory view of the extruder according to the present invention.

[Explanation of symbols]

1,1a Extruder 3 Container liner 7 Degassing valve 12 Valve spring B Billet

Claims (2)

[Claims] 1. An extruder in which a degassing valve is arranged so as to face a billet filled in a container liner, and the degassing valve is biased to be openable by a biasing means such as a valve spring or a cylinder. An extruder characterized in that 2. The extruder according to claim 1, wherein a degassing valve is provided so as to face the billet end portion, and a degassing passage is opened in a valve seat corresponding to the degassing valve.