JPH05128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a rotary plastic working device, particularly a ring rolling mill.

(Prior Art) There is a rotary plastic processing device known as a ring rolling mill. The specific structure of this device is disclosed, for example, in FIGS. 1 and 4 of the earlier application, Utility Model Application No. 60-104697.

The outline of the mechanism of this device is as follows with reference to the plan view in FIG. 4A and the side view in FIG. 4B.

A ring-shaped cylindrical material, that is, a workpiece W, is pinched in the circumferential direction from the inside and outside by a king roll KG with a vertical axis arrangement driven by a motor M1 and a mandrel roll MR, which is a freely rotating roller arranged in parallel. The roll is attracted to the king roll by its driving cylinder C1 and performs rotational plastic working on the workpiece. These are the circumferential rolling parts R
It is. The workpiece W is rolled in the height direction by the axial rolling section A. This part consists of an upper axial roll ARU and a lower axial roll that are rotationally driven by motors M2 and M3, respectively.
ARD sandwiches the workpiece W from above and below in the height direction, the upper roll is rolled down by the axial rolling drive cylinder C3, and the diameter of the workpiece gradually increases during the processing process, so the axial rolling part A is axially rolled as a whole. It is moved by a moving cylinder C2.

Conventionally, the motors M2 and M3 were matched with the workpiece speed using torque motors, and the cylinder C2 was driven manually based on the judgment of the operator.

(Problems to be Solved by the Invention) In the conventional technology, the axial rolling part needs to be moved at the discretion of the operator, so the operator has to monitor the machining state of the workpiece, which makes the operator tedious. . Furthermore, since the motors M1, M2, and M3 are driven individually, there is a problem in that the rotational speed of the axial roll cannot be sufficiently matched to the feed speed of the workpiece.

It is an object of the present invention to provide a control device capable of eliminating the operational disadvantages and inconveniences of the rotary plastic working apparatus of the prior art and correcting and supplementing the functional deficiencies.

(Means, operations, and embodiments for solving the problems) In order to achieve the above object, the present invention includes a sensor that detects the position of the axial rolling part etc. by the stroke of the cylinder C2 etc., and motors M1, M2, A sensor is provided to detect the rotational speed of the king roll and upper and lower axial rolls by detecting the rotational speed of M3, and the speed of these rolls is controlled, and a servo mechanism is added to cylinder C2 to control the stroke. . As a result, the feed rate matching and position adjustment of the axial rolling section with the feed rate of the workpiece can be automatically performed. Furthermore, by adding an algorithm for correcting the position of the contact surface of the axial roll and a mechanism for sequentially changing the position of the contact surface, wear on the roll surface can be made uniform.

In order to achieve these things, the speed control device of the rotary plastic processing apparatus of the present invention compresses the cylindrical material in the circumferential direction with a king roll and a mandrel roll arranged parallel to each other. A circumferential rolling section that rolls the circumferential direction, and an axial rolling section that rolls the cylindrical material in the height direction by compressing the cylindrical material in the height direction with two upper and lower conical axial rolls. A rotary plastic processing device equipped with a rotary plastic processing device that enables relative movement of both rolling sections, includes a position sensor that detects the position of the cylindrical material between the upper and lower axial rolls, a position sensor that detects the position of the axial direction rolling section, and both of the above. a position calculation device that determines the position of the axial rolling section by comparing and calculating the position signal detected by the position sensor and the specified position value; a rotation speed sensor that detects the rotation speed of the king roll; and a rotation speed sensor that detects the rotation speed of the king roll. The present invention is characterized by comprising a rotational speed calculation device that determines the rotational speed of the upper and lower axial rolls by dividing the detected rotational speed by the position value of the axial rolling section determined by the position calculation device.

Hereinafter, the present invention will be specifically explained with reference to embodiments shown in the accompanying drawings.

Since the basic structure of the rotary plastic working apparatus itself is almost the same as that of the conventional one, the explanations in FIGS. As a control device of the present invention, a first
The figure shows a side view showing the arrangement of sensors and a position control system, FIG. 2 shows characteristic values of the axial roll, and FIG. 3 shows a speed control system.

In the present invention, as shown in FIG. 1, a cylinder C4 for measuring the outer diameter of the workpiece is provided as a position sensor for detecting the position of the workpiece W, and its position signal is set to 4. The axial rolling part moving cylinder C2 is used as a position sensor for detecting the position of the axial rolling part A, and its position signal is set to 2.
King roll KG, upper and lower axial roll ARU,
A sensor such as a tacho generator is installed on the motors M1, M2, and M3 as a rotation speed sensor to detect the rotation speed of ARD, and the speed signal is sent to each of the motors M1, M2, and M3.
Let r ₁ , r ₂ , r ₃ .

As shown in FIG. 3, the rotational speed r ₁ of motor M1
An M1 speed command SV is provided to command the motor M.
1 is set as r ₁ , and the speed r ₁ is detected by the tacho generator TG and the rotation speed calculation device
An index value Tx (described later) is also input to OP2, and the speeds r ₂ and r ₃ are commanded to the motors M2 and M3 by calculation.

Rotation speed control is performed as follows. The index value Tx is calculated by Tx=Ca-4+2.
Ca is a mechanically determined constant. If this Tx is used, the appropriate rotational speed r ₂ of motors M2 and M3,
r ₃ is calculated from the relational expression between the workpiece feed speed on the king roll and the workpiece speed on the axial roll shown in Figure 2, DKG×r ₁ = Tx sinθ×r ₂ (r ₃ ), and r ₂ (r ₃ )=1/ Tx(DKG/sinθ)r given by ₁ . Here, DKG is the diameter of the king roll and θ is 1/2 of the cone angle of the axial roll, so DKG/sinθ is a constant.
3 can be given an appropriate speed command.

Position control of axial rolling section A is performed by position calculation device
This is done using OP1 as follows. In Figure 2, Tx and position specification value, which are also functions of 2 and 4
The position calculation unit OP calculates the value given by Tx−Cx from Cx.
Enter 1. Position calculation device OP1 is cylinder C
This amplifier is for controlling the cylinder C2 and drives the cylinder C2 in the direction to realize Tx=Cx. By rolling cylindrical material, axial roll ARU,
When the contact surface of the ARD with the cylindrical material shifts backward and Tx increases, the cylinder C2 moves in a direction to follow this. In this way, rolling is always performed at the same roll surface position.

By the above two control operations, the axial rolling section is automatically driven according to the processing of the cylindrical material, and the rotation speed of each motor for processing the cylindrical material is automatically adjusted, so that the operator can This reduces the burden on users and improves the processing quality of cylindrical materials.

Modifications of the present invention include the following aspects.

() As mentioned above, keeping the contact surface of the roll against the cylindrical material constant is advantageous in terms of speed control of the motor, but there is a problem in that it causes uneven wear of the roll surface. Therefore, this problem can be solved by adding a program that sequentially changes the cylindrical material contact surface position Cx.

() In the above embodiment, a tacho generator is used to measure the actual speed of the motor M1 with respect to the MI speed designator SV, but if there is slippage between the cylindrical material W and the mandrel roll MR, the accurate speed cannot be measured. become unable. This problem can be solved by installing a non-contact speed sensor on the aircraft side to detect the speed.

(Effect of the invention) According to the present invention, the following effects can be obtained.

The rotation speed of the axial roll motor can be matched to the feed speed of the cylindrical material. This is the rotational speed of the king roll motor and cylinder C.
2. Index value Tx calculated from the stroke of C4
This is achieved by using the axial roll motor to give an appropriate speed command to the axial roll motor. Further, by applying a command signal calculated from the strokes of the cylinders C2 and C4 to the servo mechanism of the cylinder C2, the position of the axial rolling portion can always be maintained at an appropriate position. As a result, the burden on the operator is reduced and good rolling results can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the side view and position control system of a rotary plastic processing apparatus showing the sensor arrangement in the present invention;
FIG. 2 is a diagram showing the characteristic values of the axial roll, FIG. 3 is a diagram showing the speed control system in the present invention, FIG. Figure b is its side view. W...Work, M1, M2, M3...Motor,
KG...King roll, MR...Mandrail roll, ARU...Upper axial roll, ARD...
Lower axial roll, C1, C2, C3, C4...
... Cylinder, R... Circumferential rolling section, A... Axial rolling section, SV... Speed command, OP1,
OP2...Arithmetic device.

Claims (1)

[Claims] 1. A circumferential rolling section that rolls a cylindrical material in the circumferential direction by pinching the cylindrical material in the circumferential direction with a king roll and a mandrel roll arranged parallel to each other; The rotary plasticity roller is equipped with an axial direction rolling section that rolls the cylindrical material in the height direction by pinching the material in the height direction with conical upper and lower axial rolls, and enables relative movement of both rolling sections. In the processing device, a position sensor detects the position of the cylindrical material between the upper and lower axial rolls, a position sensor detects the position of the axial rolling part, and the position signals and position designation values detected by both of the position sensors are transmitted. a position calculation device that determines the position of the axial rolling section by performing a comparison calculation; a rotation speed sensor that detects the rotation speed of the king roll; and a rotation speed detected by the rotation speed sensor determined by the position calculation device. 1. A control device for a rotary plastic working device, comprising: a rotation speed calculation device that determines rotation speeds of upper and lower axial rolls by performing a division operation by a position value of an axial rolling section.