JPS6182909A - Method for controlling peripheral length in manufacture of endless steel belt - Google Patents

Abstract

PURPOSE:To control accurately the peripheral length of a titled belt and to prevent the generation of its malformation by lowering a rolling speed when the belt arrives in the vicinity of an aimed peripheral length. CONSTITUTION:The amount of movement of a tension roll 2 is continuously detected by a detector 10, and a rolling reduction device 7 drives pressing rolls 5 to be subjected an endless steel belt 3 to reverse rolling reduction according to a control signal outputted from an amplifier 11 of detector 10 when the roll 2 arrives at a prescribed intermediate control point set previously. Further, a moving means 9 lowers a pulling force of roll 2 to a fixed value to maintain its value. By this operation, the rolling speed of belt 3 (the moving speed of roll 2) is reduced. Next, when the roll 2 moves to the aimed final point, the rolls 5 are rapidly retreated through the device 7 according to a signal from the amplifier 11 of detector 10, to finish the rolling. At need, the moving speed of roll 2 is detected through the detector 10 to compute the difference between said speed and a previously set moving speed, thereby adjusting continuously said reverse rolling reduction based on the computed difference.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for controlling the circumference of an endless steel belt at 1N15M.

<Prior Art> Some continuously variable transmissions for power transmission use multiple layers of steel endless belts. The steel belt used in this transmission is, for example, (0,1 to 0.3)±
It consists of 10 to 12 hoops of X (6+20) '''
It is necessary to increase the circumferential length by 1nth order, and this difference in circumferential length must be maintained with great difficulty. Therefore, circumferential length control is important in the production of endless steel belts.

As a prior art related to this circumference control, Japanese Patent Laid-Open No. 48-6
The one described in Japanese Patent No. 9756 is known.

In this conventional technology, an endless steel belt is installed between a tension roll and a work roll so that it can be freely circulated, and a predetermined tension is applied to the belt through the movement of the tension roll, while a pressure roll is rolled down on the work roll. The belt is rolled through. During this rolling, a pressure transducer is attached to the tension roll side, and when the tension roll reaches the vicinity of the final moving point, the pressure transducer supports and stops the movement of the tension roll, and a predetermined signal from the pressure transducer causes the pressure roll to move. A predetermined circumferential length was obtained by performing reverse rolling and reducing the rolling speed.

<Problems to be Solved by the Invention> In the above-mentioned conventional technology, since the movement of the tension roll is supported by a pressure transducer, the tension becomes extremely small as soon as the tension roll is supported, and it is easy to end up with a defective shape.

In particular, when a normal load cell type is used as a pressure transducer, due to its high rigidity, the belt tension may suddenly drop to zero, or if the processing speed is high, there may be problems in tracking the response speed. Therefore, according to the prior art, the circumference accuracy was about 1 dragon at most.

Means for Solving the Problems> The present invention was invented in order to solve the drawbacks of the prior art, such as the tendency to cause shape defects and the inability to increase the processing speed. Control is performed by direct displacement measurement without using a transducer.

That is, the present invention has taken the following measures in order to achieve the above object.

An endless steel belt is installed between the work roll and the tension roll so that it can be freely circulated, and while a predetermined tension is applied to the cough belt through the movement of the tension roll, the cough belt is pressed down on the work roll through the pressure roll. In g4 of the endless steel belt that is rolled to form the acid belt into a predetermined circumference, the first feature of the invention is that the amount of movement of the tension roll is continuously detected via a detector, and the amount of movement of the tension roll is continuously detected. When the detected value reaches a preset intermediate value, a reverse pressure is applied to the pressure roll and the biasing force of the tension roll is reduced to a predetermined value to reduce the deformation speed of the belt, and then the detected value reaches a predetermined value. When the final value of is reached, the pressure roll is rapidly retreated to finish the processing of the belt. Continuous detection is performed, and when the detected value of the movement amount reaches a preset intermediate value, the biasing force of the tension roll is reduced to a predetermined value, and a reverse pressure is applied to the pressure roll. The difference between the detected movement speed and the preset movement speed is calculated, and the belt is continuously adjusted based on the difference, thereby controlling the belt deformation speed to a predetermined value. Once a predetermined final value is reached, the pressure roll is rapidly retracted to terminate the processing of the belt.

<Example> Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 is a work roll, 2 is a tension roll, and an endless steel belt 3 is installed between both rolls 2 so as to freely circulate.

A work roll 1 is rotatably provided on a roll stand 4 and is sandwiched between a pair of upper and lower pressure rolls 5. These pressure rolls 5, 5 are Hanokua 7 Proroll 6, 6, 6
・6 Riko Yu, 111. 7 is a roll reduction device;

The tension roll 2 is rotatably supported by a movable support 1 and a Tee portion 8. This support 8 is connected to a transfer stage 9 consisting of a hydraulic or pneumatic flip or the like.

A detector 10 that continuously detects the amount of movement of the support part 8 is provided between the freely movable support part 8 and the fixed example. This detector IO may be a well-known digital displacement meter such as Magnescale or Induct Knoll, which measures displacement linearly, or a pulse generator, which converts the movement of the support part 8 into a rotational amount and detects it. It can be anything.

11 is an amplifier (control device) for the detector 0;
The amplifier 11, the lowering device 7, and the moving means 9 are electrically connected.

In order to control the circumferential length of the endless steel belt 3 using the above device, first the endless steel belt 3 installed between the tension roll 2 and the work roll 1 is circulated.

Next, as shown in FIG. 2, a predetermined tension is applied to this belt 3. This tension is applied by means of transportation 9
This is done by pulling the support part 8 so as to move it in the direction of the arrow a in FIG.

At the same time as applying the tension, the pressure roll 5 is rolled down by the rolling down device 7 in order to roll the belt 3 on the work roll 1''2.

The circumferential length of the endless steel belt 30 is extended by the above rolling. Since the tension roll 2 is pulled with a predetermined force by the moving means 9, the extension of the circumferential length of the belt 3 causes the tension roll 2 to move in the direction of arrow a in FIG.
Prevent the tension from decreasing in step 3.

Therefore, controlling the moving distance of the tension roll 2 means controlling the circumferential length of the belt.

Therefore, the amount of movement of the tension roll 2 is continuously detected by the detector IO. An intermediate control point is set in advance at a position before the final movement point corresponding to the target circumference.

The tension roll 2 is placed at the predetermined intermediate control point set by this
When , the amplifier 11 of the detector 10 issues a control signal to the moving means 9 and the lowering device 7. In response to this signal, the lowering device 7 applies a reverse pressure to the pressure roll 5, and the G2 moving means 9 lowers its tensile force to a constant value, and is maintained at that value. This operation reduces the deformation speed (rolling speed) of the endless steel belt 3.

Next, when the tension roll 2 moves to the desired final point, a signal is sent from the amplifier 11 of the detector IO to the lowering device 7.
As a result, the pressure roll 5 rapidly retreats to complete rolling.

According to the above method, when the target circumference is near,
Since the rolling speed is reduced, the pressure roll 5 is moved rapidly (
Due to the responsiveness of the multilayer, the circumference of the belt 3 can be controlled to a predetermined value.

In other words, in the conventional method, the rolling speed was the same until the final point, so when the target value G was reached, the pressure roll was suddenly retracted, and the roll was rolled slightly due to the responsivity of the retraction, and the rolling was completed. It was extremely difficult to control. In the embodiments of the present invention, such drawbacks have been overcome. According to the above embodiment,
The circumferential length of the belt was less than ±0.1511.

Furthermore, in the prior art, there was a risk that the belt tension would suddenly drop to zero near the final point, and there was a risk that the belt would be defective in shape due to rolling with a tension of O, but in this example, the belt tension is reduced, Since it is held at a predetermined value, the drawbacks of the conventional method have been solved.

The above is an example of the first invention, and it has been found from the above that it is important to reduce the end point deformation speed (rolling speed) of the belt 3 in the belt 1 circumferential length control. As a result of the study, it was found that there is a certain relationship between the end point deformation speed and the variation in circumference, as shown in FIG.

As shown in FIG. 3, when the end point deformation speed is high, the circumference becomes large. It can also be seen that if the end point deformation speed changes, the circumferential length also changes.

That is, since the belt of the present invention uses 10 to 12 m-piece steel helts stacked in multiple layers, it is necessary to produce this set of multilayer steel helts at the same end point deformation speed and at the same end point deformation speed. It can be seen that each individual steel belt must be manufactured with the variation within a predetermined range. In the present invention, ±0°5u+/
It is necessary to suppress speed fluctuations to below min.

Therefore, as in the above-mentioned embodiment, controlling the deformation speed by simply reducing the deformation speed from an intermediate control point cannot perform high-precision circumference control; control is required. Furthermore, fluctuations in the deformation speed just before reaching the intermediate control point are accompanied by fluctuations in the final deformation speed, and the shorter the distance (time) from the intermediate control point to the end control point, the larger the m5W. Therefore, it is basically important to keep the deformation speed pattern from the start of rolling to the end point constant with good reproducibility when producing all single steel belts. However, in practice, it is considered that it is sufficient to keep the deformation rate constant at the rolling end point. That is, after the intermediate control point, the roll reverse reduction amount may be adjusted by feeding the deformation speed signal to the rolling mill side.

Therefore, the second embodiment of the present invention will be described in detail below.

It is the same as shown in FIG. 1 used in this example, but
The difference is that the detector 10 not only continuously detects the moving position of the tension roll 2 but also detects its moving speed. Furthermore, the amplifier 11 not only issues control commands to the moving means 9 and/or the lowering device 7 at the intermediate control point and the end point, but also calculates the difference between the preset speed and the detected speed, and based on the difference. A control command is issued to the rolling down device 7 to adjust the reverse rolling amount of the roll.

That is, as shown in FIGS. 1 and 4, the endless steel belt 3 is stretched as it is rolled, and when it reaches the intermediate control point of the first stage, a signal is issued from the amplifier 11 to the moving means 9, and the tension roll 2 to lower the tension to a predetermined value. This method is the same as the first invention. The reason why the tension is maintained at a constant value is to solve the problem of poor shape and to keep the elastically deformed bones of the endless belt 3 constant.

The control signal issued to the rolling down device 7 at the same time as the above-mentioned signal is calculated by calculating the difference between the preset speed and the actual deformation speed of the endless belt 3. Control is performed to continuously adjust the amount of reverse rolling reduction, bringing the deformation speed closer to a preset pattern. This control continues until the final point. Therefore, the final deformation speed of the endless steel belt 3 is accurately controlled to a preset value.

However, when the final point is reached, the roll is rapidly retreated, as in the first invention described above.

According to the above-mentioned embodiment of the invention for cylinder 2, the final deformation speed is constant, so that it is possible to control the circumference with higher precision than in the first invention. Further, even if the processing speed (rolling speed) is increased, the final deformation speed can be controlled, so the rolling time can be shortened without reducing the circumferential bulk.

<Effects of the Invention> According to the present invention, the circumferential length of an endless steel belt can be controlled with high accuracy and no shape defects occur.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing the rolling equipment used in the present invention;
The figure is a graph showing the relationship between processing time and roll reduction amount, belt tension, and tension roll displacement. Figure 3 is a graph showing the relationship between end point deformation speed and circumference. Figure 4 is a graph showing the relationship between processing time and roll reduction amount. It is a graph showing the relationship between belt tension and displacement of a tension roll. ■... Work roll, 2... Tension roll, 3...
Endless steel belt, 5...pressure roll, 7.
... Lowering device, 9... Transfer'IJI means, ■o... Detector, [l... Amplifier uv-'1 curvature I'++ Procedure supplementary IE writing: Self-proposed) Showro 160
January 29th

Claims (1)

[Claims] 1. An endless steel belt is installed between a work roll and a tension roll so that it can be freely circulated, and a pressure roll is placed on the work roll while applying a predetermined tension to the belt through the movement of the tension roll. In the production of endless steel belts, in which the belt is rolled to a predetermined circumferential length through rolling, the amount of movement of the tension roll is continuously detected via a detector,
When the detected value reaches a preset intermediate value, a reverse pressure is applied to the pressure roll and the biasing force of the tension roll is reduced to a predetermined value to slow down the deformation speed of the belt, and then the detected value reaches a predetermined value. A circumferential length control method in the production of endless steel belts, which is characterized in that when the final value of is reached, the pressure roll is rapidly retreated to terminate the processing of the belt. 2. An endless steel belt is installed between the work roll and the tension roll so that it can be freely circulated, and while a predetermined tension is applied to the belt through the movement of the tension roll, the tension is applied on the work roll through the pressure roll of the pressure roll. In the manufacture of endless steel belts, in which the belt is rolled to form the belt into a predetermined circumference, the amount and speed of movement of the tension roll are continuously detected via a detector, and the detected value of the amount of movement is determined in advance. When the preset intermediate value is reached, the biasing force of the tension roll is reduced to a predetermined value, and a reverse pressure is applied to the pressure roll. The difference is calculated and the belt is continuously adjusted based on the difference, thereby controlling the belt deformation speed to a predetermined value.
A circumferential length control method for manufacturing an endless steel belt, characterized in that when the amount of movement reaches a predetermined final value, the pressure roll is rapidly retreated to finish processing the belt.