JPH0759323B2 - Extrusion processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an extrusion apparatus used for extrusion of metals such as aluminum (including alloys thereof) and the like.

2. Description of the Related Art This type of extrusion processing apparatus generally includes an extrusion die that determines the shape of an extruded product, a backer, a die ring that stores these, and an extrusion tool that is formed by combining a first and a second bolster. It is supported by the die slide at the rear end position of the end platen, and the container with the billet loaded is moved forward to the end platen side so that the front and rear end surfaces of the extrusion tool are brought into close contact with the end platen and container respectively. In this state, the stem is advanced to perform extrusion molding. Then, after one cycle of extrusion is completed with a certain amount of discard remaining, the container is retracted, and the scrap remaining in a protruding state rearward from the rear end face of the extrusion tool, that is, the discard is cut by a shear. After the next billet is loaded into the container, extrusion molding of the next cycle is performed in a push-joint state.

By the way, in the extrusion processing apparatus as described above, the distance between the end platen and the shear is fixed and fixed on the equipment. On the other hand, dies and backers placed in the vicinity of the dies undergo severe temperature changes before and after extrusion or during extrusion, and the temperature changes for each billet are different. A backer or the like undergoes a dimensional change in the length direction due to its expansion and contraction. Therefore, the extrusion tool is supposed to have some play in the die slide in the front-back direction to allow for dimensional changes.

However, when the pressing force is released due to the retreat of the container, the extrusion tool is in a substantially free state in which it can freely move within the die slide within the above play. As a result, there is a drawback that the distance between the rear end face of the die and the cutting position of the shear is not uniquely determined. For this reason, the shearing may occur at a position separated from the rear end face of the extrusion tool, but in this case, the sharpness of the shear with respect to the discard is not good and the precision of the cut surface, particularly the smoothness is poor. As a result, there is a problem that extrusion defects such as blister and entrainment are likely to occur in the profile product obtained by continuing the succeeding billet. In addition, due to the poor sharpness of the shear with respect to the discard, an outwardly protruding flash is generated at the peripheral edge of the cut surface, so that the flash is caught between the container and the die during extrusion in the next cycle, and both flashes. There is also a problem that the sealing performance between them is deteriorated.

In view of the above problems, the present invention makes it possible to perform cutting of discards by a shear with good sharpness, thereby improving the accuracy of the cutting surface and preventing burrs from being generated at the periphery of the cutting surface. Further, there is provided an extrusion processing device capable of effectively preventing the occurrence of extrusion defects such as blistering and winding of the profile product caused by the succeeding press of the subsequent billet, and the deterioration of the sealing performance between the container and the die. The purpose is to

Means for Solving the Problems In order to achieve the above object, the present invention, when cutting the discard, by pressing and urging the die toward the container side to an appropriate position, the lengthwise dimension of the die or the like is changed. However, the most preferable positional relationship with the shear is ensured.

That is, the present invention shows a die (5) arranged between the end platen (1) and the container (2) and a discard (20) protruding from the rear end of the die, as shown with reference to the drawings. In an extrusion processing apparatus equipped with a shear (13) for cutting, when the discard (20) is cut by the shear (13), the die (5) is moved to the end platen (1).
An extrusion processing device is characterized in that a pressing means (30) for pressing and urging the container from the side to the container (2) to an appropriate cutting position is provided.

Action With the above configuration, when disconnecting the discard (20),
The pressing means (30) presses and urges the die (5) from the end platen (1) side to the container (2) side to an appropriate position in relation to the shear (13). The appropriate position detecting means may be, for example, a means for pressing until a die, a die ring, or the like comes into contact with a reference surface that does not change position due to temperature change or the like. For example, as in the embodiment, the pressing force may be applied until the inner protruding edge (3a) of the die slide (3) contacts the outer step portion (7a) of the die ring (7). As a result, the die (5) is reliably held at the proper position each time the discard (20) is cut, regardless of the dimensional changes of the die (5) and the backer (6). ) Can be cut sharply.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

In the extrusion processing apparatus shown in these figures, (1) is an end platen, (4) is an extrusion tool, (3) is a die slide that supports and holds the extrusion tool (4), and (2) is a rearward and forward direction thereof. A movable container (13) is a shear for cutting discard.

The die slide (3) is a pair of upper and lower rails (1) provided in a state of protruding rearward from the rear end of the end platen (1).
It is movably held between 0) and (11), and the extrusion tool (4) is supported in the bearing holding recess (12) of the die slide (3) at the lateral position of the end platen (1). It is configured such that the extrusion tool (4) can be set at the position of the rear end surface of the end platen (1) by causing the extrusion tool (4) to travel in one direction.

In the extrusion tool (4), (5) is a die,
(6) is a backer, (7) is a die ring for housing the die (5) and the backer (6), (8) is a first bolster, and (9) is a second bolster (9).

The above-mentioned extrusion processing apparatus is the same as the conventional one, and the extrusion tool (4) is supported by the die slide (3) at the rear end position of the end platen (1), and the billet-loaded container (2) is held. ) Is advanced to the end platen (1) side so that the front and rear end surfaces of the extrusion tool (4) are brought into close contact with the end platen (1) and the container (2) respectively. By advancing, the extruded material (25) is extruded. Then, after one cycle of extrusion is completed with a certain amount of discard (20) left, the container (2) is retracted, and the discard that remains in a protruding state rearward from the rear end face of the extrusion tool (4). Shear (20) Shear (13)
After being cut by, the next billet is loaded into the container (2), and then the state of pushing is transferred to the extrusion of the next cycle.

Then, the extrusion processing apparatus according to the present invention, as described above, the conventional problems that occur in the cutting of the discard (20),
That is, in order to eliminate poor sharpness of the shear (13), a pressing means (30) is additionally provided. This pressing means (30)
In the illustrated embodiment, is a cylinder rod (31) that is movable back and forth and that penetrates the end platen (1) from the front end side to the rear end side in the thickness direction at a position where the bolster (9) can be pressed, and this cylinder. It is equipped with a pneumatic or hydraulic cylinder (32) that drives the rod. The cylinder rod (31) driven by the cylinder (32)
Thereby pushing the extrusion tool (4) toward the container (2) side until the outer step (7a) of the die ring (7) engages with the inner convex edge (3a) of the die slide (3). Has been done. The pressing means (30) may be only one, but 2
It is desirable to press the bolster (9) stably at two or more places by providing more than one piece. Also in the illustrated embodiment, two pressing means (30) are provided on the left and right sides of the lower part of the extruder.

The shear (13) is designed to perform a cutting operation at a position as close as possible to the plane where the rear end face of the extrusion tool (4) is present when the shear (13) is closest to the end platen (1) side. ing.

In the above structure, when the discard (20) is to be cut after the extrusion of one cycle is completed, first, the cylinders (32) (32) are operated synchronously so as to operate the cylinder rods (31) (31). Of the extrusion tool (4) toward the rear,
That is, it is pressed and urged toward the container (2). Then, the extrusion tool (4) moves to the outer step (7a) of the die ring (7).
Moves until it engages with the inwardly projecting edge (3a) of the die slide (3), and stops at the contact position. Die slide (3)
Since there is no expansion and contraction due to the influence of temperature, the protrusion edge (3a) of the die slide is always in a fixed position. Therefore, this edge (3a)
The engaging position between the step portion (7a) of the die ring (7) and the die ring (7) is always kept constant, and the rear end face of the die is always kept at a proper position with respect to the shear (13). Therefore, in this state, the shear (13) is cut along the surface of the extrusion tool (4) as close as possible to the rear end surface of the extrusion tool (4) to cut the discard (20) sharply,
Therefore, the cut surface can be made excellent in flatness accuracy and free from burrs.

Although the pressing means (30) is composed of the cylinder rod (31) and the cylinder (32) in the above embodiment, the pressing means (30) is not limited to this. Further, the proper position of the die (5) is ensured by the engagement between the outer step portion (7a) of the die ring (7) and the inner protruding edge of the die slide (3). After being pushed to the proper position, the container (2)
A stopper for preventing the movement in the direction may be separately provided, and the point is that the die (5) may be biased toward the proper position to the container (2) side when the discard is cut.

EFFECTS OF THE INVENTION According to the above-described extrusion processing apparatus of the present invention, the pressing means is actuated to urge the die toward the container side to the proper position so that the die is always as close to the rear end face as possible. Since the shear cutting operation can be performed at the above position, the discard can be cut with good sharpness, accuracy, and goodness. Therefore, the precision of the cut surface is improved and it is possible to prevent the occurrence of burrs on the peripheral edge of the cut surface, which in turn causes a problem in the conventional extrusion processing apparatus, that is, blister, entrainment, etc. of the die product product caused by the pushing of the succeeding billet. It is possible to effectively prevent the occurrence of extrusion defects and deterioration of the sealing performance between the container and the extrusion tool.

[Brief description of drawings]

1 is a horizontal sectional view of an extruding apparatus before actuating a pressing means in an embodiment of the present invention, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is an extruding apparatus after actuating a pressing means. FIG. (1) …… End platen, (5) …… Dice, (13)
…… Shah, (20) …… Discard, (30) …… Pressing means. .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kozo Dosaka 6-224 Kaiyamacho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd. (56) References

Claims (1)

[Claims] 1. An extrusion comprising a die (5) arranged between an end platen (1) and a container (2), and a shear (13) for cutting a discard (20) protruding from the rear end of the die. In the processing device, when the discard (20) is cut by the shear (13), pressing means for pressing the die (5) from the end platen (1) side to the container (2) side to an appropriate cutting position ( 30) is provided, an extrusion device.