JPH0639428A - Deformed block for indirect extruding machine for solid material - Google Patents

Abstract

PURPOSE:To provide a deformed block for an indirect extruding machine for a solid material with which the quantity of pressed flash is reduced and the pressed flash with a shape easy to cut is formed. CONSTITUTION:The deformed block is such that it is used in the indirect extruding machine in which both ends of a billet inside a container are pinched and pressed by compression with a die ring and a block, and in which the billet is extruded from the die ring to an extruded product with a prescribed shape; a recessed part 2 is formed in the middle part of the surface that comes in contact with the metal of the block at least one groove 3 is provided from the recessed part 2 to the peripheral part of the block; and a linear protruding part is formed on the pressed flash at the time of completing the extrusion. Since the pressed flash is reinforced with the linear protruding part, the pressed flash is not deformed and cleanly cut. Also, since the pressed flash is locally reinforced with the linear protruding part, the quantity of the pressed flash is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a profile block for a solid material indirect extruder in which the amount of pressing force can be reduced and a pressing force having a shape that can be easily cut is formed.

[0002]

2. Description of the Related Art An indirect extruder having a small extrusion pressure is often used for extruding a metal material such as aluminum. As shown in FIG. 4, this indirect extruder presses both ends of the billet 10 in the container 9 from the axial direction by the die ring 7 and the block 1, and the ram 11 behind the block 1 connects the block 1 and the container 9. By pressing in the direction of the die ring 7 and extruding the billet (metal) 10 in front of the die ring 7 into a rod 12 having a predetermined shape, the surface of the block 1 that comes into contact with the metal is conventionally flat. It had a unique shape. By the way, in the indirect extrusion method using such a flat-shaped block, there is a problem that a piping phenomenon occurs in which the central portion of the extruded rod material is hollow due to insufficient supply of metal in the final stage of extrusion, resulting in a reduction in product yield. However, there was no choice but to finish the extrusion with a considerable amount of metal left between the die ring and the block.

In order to prevent this piping phenomenon, there has been proposed a concave block as shown in FIG. 5, in which a concave portion 2 is formed in the central portion of the metal contact surface of the block 1 so as to make up for insufficient metal supply. With this concave block, the piping phenomenon can be prevented, and the pushing force after the extrusion can be pushed until the central portion is thick but the peripheral portion is thin, and the pushing force can be totally reduced. was there.

[0004]

However, if the pressing block is extruded until the pressing block becomes thin using the above-mentioned concave block, the pressing block is deformed in the cutting process of the pressing block after the extrusion is finished, and the cutting is not performed. There is a problem in that the cutting waste is not normally processed, and as a result, cutting waste remains on the die ring, and it takes a lot of time to remove the cutting waste adhering to the die ring, which lowers productivity. For this reason, even when the concave block is used, there is a problem in that the pressing metal must leave a considerable thickness in order to perform the cutting normally, and the yield cannot be sufficiently improved.

[0005]

SUMMARY OF THE INVENTION The present invention has been made as a result of intensive studies in view of such a situation. The purpose of the present invention is to remove the pressing force adhered to the die ring after extrusion from the die ring end surface. It can be neatly cut and removed without leaving any slag.
Moreover, the object is to provide a modified block for a solid material indirect extruder, which can reduce the amount of pushing force. That is, the present invention is a modified block used in an indirect extruder that presses both ends of a billet in a container from the axial direction by a die ring and a block, and extrudes the billet from a die ring into an extruded product of a predetermined shape. A recess is formed in a central portion of a surface of the block that comes into contact with the metal, and at least one groove is provided from the recess toward the peripheral edge of the block.

In the atypical block of the present invention, the surface contacting with the metal is formed into a predetermined shape to strengthen the pressing heat after the completion of extrusion and prevent the pressing heat from being deformed during cutting. is there. The present invention will be specifically described below with reference to the drawings. 1A and 1B are a front view and a side view, respectively, showing an example of a variant block of the present invention. Block 1
The recess 2 is formed in the center of the surface of the block 1 that contacts the metal, and one groove 3 is formed from the recess 2 toward the peripheral edge of the block 1. 2A and 2B are a front view and a side view showing the shape of the pressing metal attached to the die ring after being extruded using the modified block shown in FIG. The pusher 4 has a central portion protruding in a convex shape, and a single linear protrusion 6 is formed upward from the convex portion 5 to the peripheral portion of the block.

FIG. 3 is a vertical cross-sectional view showing a situation in which the pressing metal 4 is cut by the shear 8. A shear 8 is applied to the upper end of the linear protrusion 6 of the pressing metal 4 attached to the die ring 7, and the shear 8 is advanced from the linear protrusion 6 toward the central convex portion 5 to cut it. Since the pressing foot 4 is reinforced by the linear protrusions 6, the pressing foot 4 does not deform,
It is neatly cut and removed from the die ring 7 without leaving a cutting residue. In the present invention, the number of grooves provided from the concave portion of the block toward the peripheral portion of the block may be one or two or more. However, if the number is too large, the amount of pressing force increases and the effect decreases. Further, the cross-sectional shape of the groove is within a range in which the deformation of the pressing metal when cutting the formed pressing metal can be suppressed,
A thinner and shallower one is preferable because it can reduce the amount of pressing force. Also groove 2
In the case of providing this, it is effective to prevent the pressing force from being deformed by forming the both in a straight line with the concave portion sandwiched therebetween.

[0008]

In the modified block of the present invention, at least one groove is formed from the concave portion of the central portion of the surface that contacts the metal to the peripheral portion of the block. The portion has a convex shape, and a linear protrusion extending from the convex portion to the peripheral edge of the pressing metal is formed. This pressing force is cut by applying a shear to the end of the linear protrusion having high strength and advancing the shear toward the convex part at the center of the pressing force. During cutting, the shear is supported by the linear projection of the pressing foot, so that the pressing foot is not deformed. After the shear has passed through the convex portion of the central portion, the cutting length gradually decreases, so that the shear can be easily cut without providing a linear protrusion. The pressing foot formed by the block in which another groove is linearly provided with the concave portion at the center of the block surface sandwiched therebetween is constantly reinforced by the linear protrusion during cutting, and the cutting property is further improved.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 Using a modified block shown in FIG. 1 in which one groove was provided from the central concave portion of the block surface toward the peripheral portion of the block, an Al billet having a diameter of 500 mmφ was indirectly extruded into a solid rod material of 50 mmφ. Example 2 The same method as in Example 1 was used except that a modified block in which two grooves were provided in a straight line with grooves sandwiching the modified block was used.
A solid bar made of 1 was indirectly extruded. Comparative Example 1 A solid bar made of Al was indirectly extruded by the same method as in Example 1 except that a concave block having only a concave portion on the metal contact surface was used. In this way, the thickness and weight of the peripheral portion of the pressed metal after the extrusion using the blocks having various shapes were measured. The results are shown in Table 1.

[0010]

[Table 1]

As is clear from Table 1, the products of the present invention (No.
In Nos. 1 and 2, the amount of pressing force was small, and the pressing force was not deformed during cutting, and the pressing force could be completely removed from the end surface of the die ring without cutting. In particular, No2, which has two linear grooves, was cut very quickly.
On the other hand, in No. 3 of the comparative example product, the pressing metal was left thick, so that the pressing metal could be cut normally, but No. 3 in which the pressing metal was thinned
In No. 4, the pressing metal deformed during cutting, resulting in defective cutting, and cutting slag remained on the die ring surface, and it took time and effort to remove this and the productivity fell. Even with No4, which has a thin pressed metal, the amount of pressed metal is 18.4 kg, which is a large increase compared with the product of the present invention.

[0012]

[Effect] As described above, when the modified block of the present invention is used, the amount of pushing force is small, and the pushing force can be easily cut and removed from the end face of the die ring without leaving a slag.
Therefore, the yield and the productivity can be improved, and the industrially remarkable effect is achieved.

[Brief description of drawings]

FIG. 1 is a front view and a side view showing an example of a variant block of the present invention.

2A and 2B are a front view and a side view showing an example of a shape of a pressing metal after being extruded by the profile block of the present invention.

FIG. 3 is an explanatory diagram of a process of cutting and removing the pressed metal after extruding with the modified block of the present invention.

FIG. 4 is a process explanatory diagram of an indirect extrusion method.

FIG. 5 is a side view of a conventional concave block.

[Explanation of symbols]

 1 Block 2 Recess 3 Groove 4 Pushing Heather 5 Convex 6 Straight Protrusion 7 Die Ring 8 Shear 9 Container 10 Billet 11 Ram 12 Extruded Rod

Claims (1)

[Claims] 1. A modified block for use in an indirect extruder, wherein both ends of a billet in a container are axially clamped by a die ring and a block, and the billet is extruded from the die ring into an extruded product having a predetermined shape. A modified block for a solid material indirect extruder, characterized in that a concave portion is formed in a central portion of a surface of the block which is in contact with the metal, and at least one groove is provided from the concave portion toward a peripheral portion of the block.