JP2973073B2 - Extruder degassing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, aluminum or Al
Extrusion of aluminum alloy billet for aluminum building materials
The present invention relates to a deaeration method for discharging air accumulated between a container, a mold, and a tip of a billet at an initial stage of billet extrusion in an extruder using an extruded shape member .

[0002]

2. Description of the Related Art As an extruder, for example, Japanese Patent Publication No. 63-78
As shown in Japanese Patent Publication No. 50, a die is attached to a die slide via a die ring, a billet is put in a container facing the die slide, and the billet is extruded by pressing the billet with a stem and pressing the billet against the die. What is known is.

When a billet is extruded by such an extruder, air accumulates between the mold, the container and the outer peripheral surface of the billet at the initial stage of extruding a new billet. I will.

[0004] The cause of this is that when the front end surface of the billet is pressed against the mold surface, the billet is deformed into a saw-tooth shape, and a space is created between the mold, the container and the outer peripheral surface of the billet front end, and the mold is formed in that space. Air enters through the gap between the container and the container, and then the container is pressed against the mold, and the billet is filled in the container with the stem and filled into the mold. It is considered that air accumulates and the air mixes with the extrusion.

As a method of deaeration of an extruder, for example, as shown in JP-B-63-7850, an annular contact member is provided between a mold and a container, and a slit is formed in the annular contact member. There is known a method of discharging air existing between the rear end and the front end of two billets to the outside through a slit of an annular contact member by the pushing pressure of the billet.

As a method of degassing an extruder, Japanese Patent Publication No. Sho 5
As shown in JP-A-5-13811, a liner is provided on a container, and an annular body is provided between a container and a mold on the outer peripheral side of the liner, and a gap between the annular body and the container is opened in the liner. In addition, a method is known in which the gap is connected to a vacuum device to suck air inside the liner to deaerate the liner.

[0007]

The former is a degassing method.
And the container and the mold by the slit of the annular contact member
Is always in communication with the outside, so when extruding the billet
The billet may enter the slit. Degassing the latter
In this method, the number of parts is large and the structure is complicated.
Since a vacuum device is used outside the output device, the cost is increased.

Therefore, an object of the present invention is to provide a method for degassing an extruder which can solve the above-mentioned problems.

[0009]

According to a first aspect of the present invention, a mold support member 2 having a mold 1 and a container cylinder 8 provided on the mold support member 2 are moved toward the mold 1. a container 3, in an extruder having a stem 7 to push the billet 5 on the liner 4 which is provided on the container 3, before
One of the opposite end surfaces of the container 3 and the mold 1
When the is pressed with a weak force, the opposite end of the mold 1 and the liner 4
Elastic deformation when a gap is created between surfaces and pressed with strong force
Elastic body 2 in which the opposing end surfaces of the mold 1 and the liner 4 are pressed against each other
0, 30 and push the container 3 with a weak force
A gap is formed between the mold 1 and the facing end surface of the liner 4, the Jo
Insert billet 5 into liner 4 and press with stem 7
And the outer peripheral surface of the tip of the billet 5, the liner 4, and the mold 1
The air between the billet and the billet
Is pressed against the mold 1, and in this state, the container 3 is strongly pressed.
The elastic members 20 and 30 are elastically deformed by pressing and the liner 4 is made of gold.
The gap is closed by pressing against the mold 1 and the stem is
Press the billet 5 with 7 and extrude it.
Degassing method of the extruder.

According to a second aspect of the present invention, a mold support member 2 having a mold 1, a container 3 moved toward the mold 1 by a container cylinder 8 provided on the mold support member 2, and a container 3. An extruder provided with a stem 7 for pushing a billet 5 into a liner 4 provided in the mold support member 2.
And the intermediate stop positioning cylinder 40 with its piston rod
40a is the front of the container 3 at the end of the extension stroke
When the contact 3a comes into contact, the liner 4 and the mold 1 face between the facing end faces.
Install so that a gap is formed, and position the intermediate stop
The piston rod 40a of the cylinder 40 is extended with high-pressure oil.
Low end and container cylinder 8 low
The front surface 3a of the container 3 is reduced by pressurized oil and the piston rod 4
0a and a gap between the opposed end faces of the liner 4 and the mold 1
A gap is formed , and a billet 5 is inserted into the liner 4 in this state.
Into the billet 5 and push it with the stem 7
The air between the liner 4 and the mold 1 is discharged from the gap to the outside.
After discharging, the billet 5 is pressed against the mold 1, and in this state,
The intermediate cylinder 8 is contracted with high-pressure oil to operate,
Shrink the piston rod 40a of the stop positioning cylinder 40
Moving the container 3 while moving it to turn the liner 4 into the mold 1
The gap is closed by pressing it .
Extruded by pressing the billet 5
This is the method of degassing the machine.

[0011]

According to the first aspect, the mold 1 and the liner 4 are provided.
The billet 5 is lined with a gap formed between the opposite end faces of
By pressing along the corner 4, the outer peripheral surface of the billet 5
Exhaust air between the inner 4 and the mold 1 to the outside through the gap.
Remove and deaerate, close liner 4 against mold 1 and close gap
Press the billet 5 against the mold 1 in the closed state and extrude it.
Since it can be degassed by pressing the billet 5
In addition, a gap for degassing when extruding the billet 5
The billet 5 does not penetrate into the space. Moreover, the elastic body 2
High cost because only 0 and 30 are provided
Nor.

According to the second invention, the mold 1 and the liner 4
The billet 5 is lined with a gap formed between the opposite end faces of
By pressing along the corner 4, the outer peripheral surface of the billet 5
Exhaust air between the inner 4 and the mold 1 to the outside through the gap.
Take out and deaerate, abut the mold 1 with the liner 4
Press the billet 5 against the mold 1 while closing
Since it can be degassed by pressing the billet 5
In both cases, a gap for degassing when extruding the billet 5
The billet 5 does not enter between. Moreover, intermediate stops
Since only the stop positioning cylinder 40 is provided, cost
The cost does not increase.

[0013]

[Embodiment] As shown in FIG. 1, a container 3 is provided facing a mold mounting member 2 having a mold 1, and the container 3 is provided with a liner 4, and a billet 5 is provided in the liner 4. The billet 5 is pushed toward the mold 1 by the stem 7 through the dummy block 6 through the dummy block 6. The container 3 is pressed against the mold 1 by the container cylinder 8 attached to the mold attaching member 2. They are separated.

The mold mounting member 2 is, as shown in FIG.
An end plate 9 and a pressure ring 10 are provided. A cassette 11 is mounted on the end plate 9, and a mold 1 is mounted on the cassette 11 by a pressing plate 12. Are tapered surfaces 13.

A pair of elastic members 20 are attached to the outer periphery of the front surface of the holding plate 12 with bolts 21 facing each other in the radial direction, and the elastic members 20 are attached to thick attachment pieces 22 as shown in FIG. It is made of a thin elastic piece 23, and its mounting piece 22
The elastic piece 23 is attached to the outer periphery of the front surface of the holding plate 12 with bolts 21 so that the elastic piece 23 is separated from the front surface of the holding plate 12 so as to be elastically deformable, and the elastic pieces 23 face each other at an interval. The tapered surface 13 of the liner 4 is in contact with the piece 23.

Next, the operation will be described. Container cylinder
8, the container 3 is moved toward the mold 1 by reducing the thrust, and the tapered surface 13 of the liner 4 is
3 is pressed with a small force to form a gap between the front end face 4 a of the liner 4 and the front face of the mold 1. At this time, the elastic piece 23 may be slightly elastically deformed or may not be elastically deformed.

In the above-described state, the billet 5 is inserted into the liner 4 of the container 3, the billet 5 is pushed by the stem 7 via the dummy block 6, and the billet 5 contacts the outer peripheral surface of the billet 5.
Air from the space between the molder 4 and the mold 1 from the above-mentioned gap.
The billet 5 is pressed against the front surface of the mold 1 while being discharged to the outside, and the billet 5 is filled in the liner 4 to complete the upset. Increase the thrust of container cylinder 8
The tener 3 is pressed against the mold 1 by a large force, and the elastic pieces 23 of the pair of elastic members 20 are elastically deformed by the tapered surface 13 of the liner 4, and the tip end surface 4 a of the liner 4 is pressed against the front surface of the mold 1. The gap between the mold and the mold 1 is closed (that is, sealed). Further press billet 5 into mold 1
Fill and extrude.

FIG . 4 shows a second embodiment of the elastic body, in which a discontinuous ring-shaped elastic body 3
0 is attached with a screw 31. As shown in FIGS. 4 and 5, the elastic body 30 has a thick mounting piece 32 and a thin elastic piece 3.
3, the mounting piece 32 is attached to the tip end surface 3a of the container 3 with a bolt 31, and the elastic piece 33 faces the tapered surface 13 of the liner 4 with a gap. The front surface 33a of the elastic piece 33 slightly protrudes from the front end surface 4a of the liner 4.

In this manner, when the container 3 is moved to the mold 1 side with a small force, the front surface 33a of the elastic piece 33 contacts the front surface of the mold 1 and the front surface of the mold 1 and the front end surface of the liner 4. When the container 3 is moved with a strong force, the elastic piece 33 is elastically deformed and the front end face 4 of the liner 4 is deformed.
Since a is pressed into contact with the front surface of the mold 1 to seal it, degassing can be performed in the same manner as described above.

FIG . 6 shows a second embodiment, in which a mold mounting member 2 is provided.
, An intermediate stop positioning cylinder 40 is attached thereto, and its piston rod 40a faces the front surface 3a of the container 3, and the piston rod 40a has an extension stroke end to regulate the movement stroke of the container 3 toward the mold 1. It stops at an intermediate position between the closed position and the open position. Here, the intermediate position is the front surface 3a of the container 3.
This is a position where a minute gap is formed between (the front end surface 4a of the liner 4) and the front surface of the mold 1.

The supply of discharge pressure oil from a first hydraulic pump 42 to an extension chamber 41 of the intermediate stop positioning cylinder 40 is controlled by a first switching valve 43, and a discharge path 42 a of the first hydraulic pump 42 is supplied to a high pressure relief valve. A discharge pressure oil 44 is provided at a high pressure. The first hydraulic pump 42
The discharge pressure oil of the second hydraulic pump 45 and the discharge pressure oil of the second hydraulic pump 45 are controlled to be supplied to a third switching valve 47 by a second switching valve 46, and the expansion chamber 48 and the contraction chamber 4 of the container cylinder 8 are controlled by the third switching valve 47.
7, a low pressure relief valve 50 is provided in the discharge passage 45a of the second hydraulic pump 45, and the pressure of the discharge pressure oil is low.

Next, the operation will be described. Container 3 in mold 1
Side, the first switching valve 43 is moved to the first position a,
The switching valve 46 is in the first position b, and the third switching valve 47 is in the first position c.
The high pressure oil of the first hydraulic pump 42 is supplied to the extension chamber 41 of the intermediate stop positioning cylinder 40 to
With “a” as the extension stroke end, the low pressure oil of the second hydraulic pump 45 is supplied to the contraction chamber 49 of the container cylinder 8 to move the container 3 to the mold 1 side. This allows the middle rank
The thrust of the positioning cylinder 40 is
Since it is larger than the thrust, the front surface 3a of the container 3 comes into contact with the piston rod 40a of the intermediate stop positioning cylinder 40 and is stopped at the intermediate position. After this, the liner of container 3
-4, insert billet 5 into dummy block 6
Push billet 5 with stem 7 and do not degas as before.
Upset billet 5.

When the upset is completed, the second switching valve 43
Is switched to the second position d and the second switching valve 46 is switched to the second position e to supply the high-pressure oil of the first hydraulic pump 42 to the contraction chamber 49 of the container cylinder 8 and to extend the extension chamber 41 of the intermediate stop positioning cylinder 40. The container 3 is communicated with the tank and pressed with a strong force to press the front surface 3 a of the container 3 against the front surface of the mold 1 to seal. Press billet 5 in this state
Mold.

In the above description, the first switching valve 43 may be slowly switched from the first position a to the second position d so that the pressure in the extension chamber 41 of the intermediate stop positioning cylinder 40 decreases slowly. . In this case, the first switching valve 43 may be an electromagnetic proportional valve that performs switching operation in proportion to the current flowing through the solenoid. It goes without saying that a hydraulic circuit other than the hydraulic circuit described above may be used.

[0025]

According to the first aspect of the present invention, the mold 1 is
With a gap formed between the facing end faces of the liner 4,
The tip of the billet 5 is pushed by pushing the
The air between the outer peripheral surface, the liner 4 and the mold 1 is
To the outside and degassed.
Press the billet 5 against the mold 1 with the gap closed
To extrude, press the billet 5 to degas
When the billet 5 is extruded,
The billet 5 does not enter the gap. Moreover,
The cost is high because only the elastic members 20 and 30 are provided.
It won't be.

According to the second aspect of the present invention, the mold 1 and the
Billet with a gap formed between opposing end faces of inner 4
5 is pushed along the liner 4 so that the tip of the billet 5
The air between the peripheral surface, the liner 4 and the mold 1 is released from the gap.
Discharged to the outside and degassed, and the liner 4 abuts the mold 1
And press the billet 5 against the mold 1 with the gap closed.
And extruded, degassing by pressing billet 5
As well as degassing when extruding billet 5
Billet 5 does not intrude into the gap for the use. Only
Also requires only the provision of the intermediate stop positioning cylinder 40.
Cost does not increase.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of an extruder.

FIG. 2 is a sectional view of a mold and a container part.

FIG. 3 is a perspective view of an elastic body.

FIG. 4 is a sectional view of a mold and a container showing a second embodiment of the elastic body.

FIG. 5 is a perspective view of an elastic body.

FIG. 6 is an explanatory diagram of the overall configuration of a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Die, 2 ... Die mounting member, 3 ... Container, 4 ... Liner, 5 ... Billet, 7 ... Stem, 20 ... Elastic body, 22
... mounting pieces, 23 ... elastic pieces.

Claims (2)

(57) [Claims] A mold supporting member provided with a mold and a container cylinder provided on the mold supporting member.
, And a stem 7 for pushing a billet 5 into a liner 4 provided in the container 3, a container 3 is provided on one of the opposed end faces of the container 3 and the mold 1.
When the mold 3 is pressed with a weak force, the mold 1 faces the liner 4
There is a gap between the end faces, and when pressed with strong force,
An elastic body that is shaped and presses the opposing end faces of the mold 1 and the liner 4
20 and 30 are attached , and the container 3 is pressed with a weak force to
A gap is formed between the opposed end faces, and in this state, the billet 5 is inserted into the liner 4 and the stem is inserted.
7 and press the billet 5 on its outer peripheral surface with the liner 4,
The air between the mold 1 and the mold 1
The container 5 is pressed against the mold 1, and in this state, the container 3 is pressed with a strong force to
0 is elastically deformed and the liner 4 is pressed against the mold 1 to
The gap is closed, and in this state, the billet 5 is pushed by the stem 7 and extruded.
Degassing method for extruder to be molded. 2. A mold 1 comprising a mold support member 2 having a mold 1 and a container cylinder 8 provided on the mold support member 2.
In the extruder having the container 3 moved toward the container 3 and the stem 7 for pushing the billet 5 into the liner 4 provided in the container 3 , the intermediate stop positioning cylinder 40
When the piston rod 40a is at the end of the extension stroke.
When the front surface 3a of the container 3 contacts the liner 4, the liner 4 and the mold
1 and a piston rod 40 of the intermediate stop positioning cylinder 40.
a with high pressure oil to extend stroke end
The container cylinder 8 is reduced by the low-pressure oil front of the container 3
The surface 3a contacts the piston rod 40a and the liner 4 and the mold.
In this state, a billet 5 is inserted into the liner 4 and a stem is formed.
7 and press the billet 5 on its outer peripheral surface with the liner 4,
The air between the mold 1 and the mold 1
The container 5 is pressed against the mold 1, and in this state, the container cylinder 8 is contracted with high-pressure oil to operate.
The piston rod 4 of the intermediate stop positioning cylinder 40
Move container 3 while shrinking 0a
4 is pressed against the mold 1 to close the gap, and in this state, the billet 5 is pushed out by the stem 7 and extruded.
Degassing method for extruder to be molded.