JPS6128409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously extruding steel materials.

In order to continuously make steel material thinner, the common method is to pass it through a die with a predetermined diameter and wind it onto a rotating drum, but in order to make the material even thinner, a combination of multiple dies and winders is lined up. There is a need,
If a wire breaks during operation, it will inevitably lead to a significant drop in productivity, and since the equipment will be complex and large-scale, a great deal of skill will be required to adjust the work. Conventionally, the conform extrusion method, which is a continuous extrusion method for processing non-ferrous soft metals such as aluminum, has been known as a simpler method than the above method, but the material pressing mechanism of this method is a one-piece high-strength material called a shoe. It mainly consists of members using materials. FIG. 1 is a schematic diagram showing one aspect of a device used in the conventional means, in which a material 1 is passed through guide rolls 5 and 5' to a wheel 2.
The wheel 2 is introduced between the integral shoe 4 and the integral shoe 4, and the wheel 2 is rotationally driven.
By applying a pressing force to the material 1, the friction stress generated between the material 1 and the wheel 2 causes the material 1 to press against the wheel 2.
The material moves along the outer periphery of the material and is extruded through the die 3 to become a product. However, such a one-piece shoe requires extensive processing and heat treatment, making it complicated and difficult to manufacture. In addition, if local wear occurs in a part of the shoe, the entire shoe must be replaced, making the replacement large-scale and complicated, and the pressing contact length of the material cannot be changed, making it unnecessarily long. It was hot. In addition, the one-piece shoe has high rigidity, and the pressing force may vary depending on changes in the diameter of the material, resulting in unstable work. Therefore, the above-described conventional means has not been applied to materials such as steel where it is difficult to apply a sufficient pressing force to the yield stress of the material. In addition, as shown in Fig. 4, the die 3 of the conventional device has a material reservoir, and in this part, dead metal D, that is, a material that remains in the die 3 and is not extruded, is formed and the dead metal D and the die 3 are Strong machining was performed using the frictional heat generated between the flowing material 1, but the conventional dies described above are capable of processing non-ferrous soft metals such as aluminum, and are capable of processing against the yield stress of materials such as steel. If this is done on a material to which sufficient pressing force cannot be applied, the die and shoe will not be able to withstand it.

The present invention eliminates the drawbacks of the above-mentioned conventional means and makes it possible to apply such means to steel materials.The present invention enables processing and heat treatment of shoes using high-strength materials on a small scale, and eliminates the problem of local wear. The purpose of the present invention is to provide an apparatus having a material pressing mechanism that facilitates the replacement of the material, allows arbitrary control of the pressing contact length necessary for extruding the material, and further allows the material to be pressed uniformly.

That is, the present invention provides a continuous extrusion device that extrudes a steel material introduced between a wheel outer circumferential groove and a shoe using pressure from the shoe and frictional force generated by the rotation of the wheel, in which each shoe is independent. A steel material characterized by being separated into a plurality of segments having a pressing mechanism that can be controlled, and having a die having a tapered hole with a die half angle of 45° or less adjacent to the end of the shoe. This is a continuous extrusion device.

The present invention will be explained in detail below.

FIG. 2 is a schematic diagram showing the principle of the present invention, in which the material 1 is passed through the wheel 2 through guide rolls 5 and 5'.
and the segment 6, which is separated into a plurality of pieces. Since the wheel 2 is rotationally driven, by applying a pressing force to the segments 6 by the pressing mechanism 7, the material 1 is moved along the outer periphery of the wheel 2 due to the frictional stress generated between the material 1 and the wheel 2. The material 1 passes through the narrow hole portion of the die 3', which has a tapered hole with a die half angle of 45 degrees or less, by the pushing force caused by this friction, and is reduced in area. In this case, the hole shape of the die 3' is made into a tapered hole with a die half angle of 45 degrees or less. By doing so, significant dead metal is not formed as in the conventional method, and heat generation is controlled. This increases the life of the die 3' and the segment 6. If the half angle of the die exceeds 45 degrees, significant dead metal will be formed and heat generation cannot be suppressed as in the conventional method, so the die 3' and the life of segment 6 is shortened. This segment 6 may or may not be in contact with an adjacent segment,
It is desirable that the contact surface with the material 1 is machined to have the curvature of the outer diameter of the wheel 2, and that the introduction side of the material 1 is chamfered so that the material can be introduced smoothly.

By adopting such a mechanism that separates and configures into a plurality of segments 6, it is possible to create an integrated shoe 4.
It is easy to manufacture because processing and heat treatment can be performed on a small scale compared to the conventional method, and replacement can be easily performed when local wear occurs in a part.

Further, the pressing contact length required for extrusion can be changed arbitrarily depending on the material 1, and a uniform pressure can be applied because the pressing force is applied correctly in the axial direction of the wheel 2. This prevents slippage between the material 1 and the material 1 when it is drawn in by the wheel 2, and enables stable extrusion. It is also possible to gradually increase the pressure toward the die 3', thereby making it possible to prevent buckling of the material 1 due to axial compressive force. In this case, various means such as a hydraulic cylinder, screw, or pneumatic pressure can be used as the pressing mechanism 7, but especially when a hydraulic cylinder is used, it is easy to generate a strong force and it is difficult to control the necessary pressing force. It is possible.

Furthermore, FIG. 3 shows that each segment 6 has a spring 8.
FIG. 3 is a partially enlarged view of a pressing portion showing an embodiment in which a pressing portion is built-in. That is, by inserting the spring 8 between the segment 6 and the pressing mechanism 7, the rigidity can be lowered, and fluctuations in the pressing pressure when the wheel 2 rotates due to changes in the diameter of the material can be absorbed, and stable operation can be achieved. Ru.

As described above, the present invention overcomes the drawbacks of the pressing mechanism of the conventional means and makes it possible to continuously extrude steel materials. It is clear that a material filled with a metallic substance or a different metal can also be applied and has great industrial value.

The effects of the present invention will be illustrated in more detail with reference to Examples below.

Mild steel with a diameter of 10 mm was used as the material, the radius of the wheel was 250 mm, the central angle of the part where the shoe contacts the material was 180°, the shoe was composed of 8 segments, and the length of each segment was 92 mm.
The pressing mechanism used a hydraulic cylinder, and the pressing force was 3.6 tons per segment. The wheel drive motor was 100kW, and the material feed speed was 50m/min. When extruded using a tapered die with a die half angle of 30 degrees, the material can be processed to a maximum diameter of 4.5 mm, and this area reduction rate reaches approximately 80%. This makes it possible to easily achieve a reduction in area of 30% or more compared to conventional drawing methods, which can only reduce the area by about 30%, and the industrial effects are extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one aspect of conventional means, and FIG.
The figure is a schematic diagram showing the principle of the present invention, FIG. 3 is a partially enlarged view of an embodiment showing a pressing mechanism in which each segment has a built-in spring, and FIG. 4 is an explanatory diagram showing how dead metal is formed. 1...Material, 2...Wheel, 3...Dice,
3'...Taper die, 4...Shaw, 5,5'...
...Guide roll, 6...Segment, 7...Press mechanism, 8...Spring, D...Dead metal.

Claims (1)

[Claims] 1. In a continuous extrusion device that extrudes a steel material introduced between a wheel outer circumferential groove and a shoe using pressure from the shoe and frictional force generated by the rotation of the wheel, the shoe: Each segment is separated into a plurality of segments each having an independently controllable pressing mechanism, and a die is formed adjacent to the end of the shoe with a tapered hole with a die half angle of 45° or less. Features: Continuous extrusion equipment for steel materials. 2. The continuous extrusion device for steel material according to claim 1, wherein the pressing mechanism is a mechanism in which each segment has a built-in spring and the pressing force is transmitted to the material via the spring.