JPH0730191Y2 - Ring rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rolling mill for rolling a ring-shaped work.

[Conventional technology]

Conventionally, a rolling mill for rolling a ring-shaped work, as shown in FIG. 2, sends a work 3 into a hole formed by a main roll 1 and a middle roll 2 in accordance with the rotation of the rolls 1 and 2, 3 has a structure of rolling 3. Before and after the hole type, holding rolls 4 and 5 having an axis parallel to the main roll 1 and the middle roll 2 are arranged. The hugging roll 4,
5 is elastically urged to the work with a constant reaction force,
When the diameter of the work 3 is expanded by rolling, the position is adjusted and a constant reaction force is applied to the work 3 to suppress the deviation of the work 3 during rolling. Reference numerals 6 and 7 are edge rolls for processing the end portion of the work 3, and reference numeral 8 is a sizing roller for detecting the enlargement of the diameter of the work 3 during rolling.

[Problems to be solved by the device]

However, when rolling a ring having an asymmetrical cross-section in the vertical direction, as shown in FIG. 3, there is a difference in the material elongation between the upper and lower parts due to the unbalance of the reduction ratio of the material. As shown in FIG. 4, the work 3 swings up and down due to the generation of thrust force, etc., and the material is not guided to an appropriate position with respect to the roll hole type. Therefore, there is a problem that the work 3 cannot be formed into a target shape.

To solve this, as shown in FIG. 5, it is conceivable to attach (or guide) the biting position of the material by providing a roll hole type brim 9. But in this case,
Defects such as biting out and brim of the material such as fir tree tend to occur. Further, there is also a problem that the roll cost is high due to the fact that the roll hole type is deep and the roll wear is large.

An object of the present invention is to provide a ring rolling mill capable of accurately guiding a material into a hole type.

[Means for Solving the Problems]

According to the present invention, the above object is achieved by the following ring rolling mill. That is, it is characterized in that a pair of upper and lower guide rolls, each of which has a vertically adjustable position and an adjustable horizontal plane angle, is arranged before and after the hole formed by the main roll and the middle roll. Ring rolling mill.

[Action]

By providing a pair of upper and lower guide rollers before and after the hole die, the position of the ring is controlled in the up-down direction (ring axial direction), and the material is properly guided to the hole die. Further, since the position of the guide roller can be adjusted in the vertical direction, it is possible to follow the change in the vertical dimension of the work during rolling. Also,
Since the guide roller can adjust the angle in the horizontal plane, even if the diameter of the work is expanded during rolling and the center of the ring is deviated, the axis of the roller can always be oriented to the center of the ring, so Twisting or twisting can be prevented from occurring.

〔Example〕

Hereinafter, a preferred embodiment of the ring rolling mill according to the present invention will be described with reference to FIG.

In FIG. 1, 1 is a main roll, 2 is a middle roll, 3 is a ring work, 4, 5 are hugging rolls, 6 and 7 are edge rolls, and 8 is a sizing roller. It is the same as the conventional device. Therefore, the main roll 1 and the middle roll 2
Cooperate with each other to form a die for rolling and forming the work 3 therebetween.

The difference from the prior art is that, in the present invention, a pair of upper and lower guide rollers 10, 10, 11, 11 are provided in front of and behind the hole type, respectively. Reference numerals 10 and 10 denote rollers arranged on the front side (entrance side) of the hole type, and 11, 11 denote rollers arranged on the rear side (outlet side) of the hole type. The pair of upper and lower rollers 10 and 10 and the pair of upper and lower rollers 11 and 11 are arranged so as to sandwich the work 3 from above and below, and rotatably contact the work 3.

The positions of the pair of rollers 10 and 10 and the pair of rollers 11 and 11 can be adjusted in the vertical direction, and the angle in the horizontal plane can also be adjusted. The reason why the vertical position can be adjusted is that the work 3 follows the change in the vertical dimension during rolling, and the angle can be adjusted because the work 3 is rolled. Since the diameter of the ring expands and the center of the ring shifts, always keep the axis of the roller toward the center of the ring, make the roller and work orthogonal to each other in plan view, and twist between the roller and work. This is to prevent the generation of prying force.

The vertical positions and angles of the pair of rollers 10 and 10 and the pair of rollers 11 and 11 are controlled by a computer (not shown) not shown. More specifically, the computer momentarily detects the vertical position of the work 3 from the vertical positions of the edge rolls 6 and 7, and detects the diameter of the work 3 from the sizing roller 8 momentarily, and the guide roller
Target vertical positions and target angles of 10, 10, 11, and 11 are calculated, and the actuators of the rollers are controlled so that the rollers 10, 10, 11, and 11 have the positions and angles.

Next, the operation will be described.

The work 3 is adjusted in vertical position by the guide rollers 10, 10, 11 and 11 before and after the hole die, and is bitten into the hole die and rolled.

In this case, when the work 3 has an asymmetrical cross section in the vertical direction, the vertical force is generated as described above,
This force is received by the guide rollers 10 and 11, and the work 3 is positioned in the vertical direction. Therefore, the rollers 10 and 11 controlled to the position determined by the computer accurately guide the material to the hole shape, and the material is not displaced from the optimum position by the vertical force.

Further, the angles of the guide rollers 10 and 11 are also controlled by the computer so that they are always orthogonal to the work 3, so that no force such as twisting is applied to the work 3, so that the work 3 has a perfect circle. Nonetheless, the molding accuracy is improved.

[Effect of device]

According to the present invention, the ring rolling mill is provided with a pair of upper and lower induction rollers before and after the hole die, so that the material is guided to the hole die with high accuracy, thereby improving the rolling stability and forming accuracy. The effect is obtained. Further, since the position of the guide roller can be adjusted in the vertical direction, it is possible to follow the change in the vertical dimension of the work during rolling. In addition, since the guide roller can adjust the angle in the horizontal plane, even if the diameter of the work is expanded during rolling and the center of the ring is displaced, the axis of the roller is always directed toward the center of the ring. It is possible to prevent twisting and twisting between the work and the work.

[Brief description of drawings]

FIG. 1 is a perspective view of a ring rolling mill according to the present invention, FIG. 2 is a perspective view of a conventional ring rolling mill, and FIG. 3 is a hole showing a state in which vertical force is exerted on a workpiece having an irregular cross section. Sectional view of the die and work, Fig. 4 is a sectional view of the die and the work showing a state where the work is displaced downward from the die by the vertical force of Fig. 3, and Fig. 5 is a brim to the die. FIG. 4 is a cross-sectional view of the hole type in the case. 1 ...... Main roll 2 ...... Medium roll 3 ...... Work (ring) 4, 5 …… Hugging roll 6, 7 …… Edge roll 8 …… Sizing roller 10, 11 …… Induction roller

Claims (1)

[Scope of utility model registration request] 1. A pair of upper and lower guide rolls, each of which has a vertically adjustable position and an adjustable horizontal plane angle, is provided in front of and behind the hole formed by the main roll and the middle roll. Characteristic ring rolling mill.