JPH11277324A - Trimming method and device for band steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the accidental temperature change of a spindle mounting a round edge by a simple means and control a gap amount with high accuracy automatically. SOLUTION: This is a method for controlling a spindle temperature by the operation of the rotation lubricant medium of a spindle 5. This device is provided with a thermometer for measuring the temperature of the spindle and a temperature adjuster 12 and/or flow rate adjust valve is provided on the supply passage of a fluid which is the rotation lubricant medium of the spindle. The temperature and/or flow rate of the lubricant medium passing the supply passage can be adjusted in response to the measured temperature value of the thermometer in this device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for trimming a steel strip, and more particularly, to a method and an apparatus for enabling high precision trimming of a steel strip.

[0002]

2. Description of the Related Art As shown in FIGS. 3 (a) and 3 (b), in order to remove a thickness reduction (edge drop) portion at a width end of a steel strip (material to be trimmed) 1, a spindle 5 is provided. Trimming is generally performed with the mounted round blade (shear blade) 2. In order to perform the trimming stably and to improve the cross-sectional shape after the trimming, the lap 3 (distance between the cutting edges) of the upper and lower round blades 2 and 2 and the gap 4 (the distance between the blade surfaces) depend on the material and the thickness of the material 1 to be trimmed. It is important to properly adjust the distance and clearance. Especially for gaps, strict accuracy is required because the error is directly linked to the quality of the cross-sectional shape (for example, cutting a thin steel sheet with a thickness of 0.2 mm). The gap target is 0.02mm ± 0.005mm).
For example, as shown in FIG. 4, if the gap is too wide, the cut end flows upward and the shape deteriorates. If the gap is too narrow, chances of the upper and lower round blades rubbing each other increase, shortening the life of the round blades and causing cutting failure. In the figure, reference numeral 1A denotes ear dust generated by the trimming.

As a technique for setting the gap to an appropriate value, there is a technique of measuring an operation amount of an axis shift drive system (a drive system provided to move a spindle in an axial direction to adjust a gap amount) and determining a spindle position. The method of controlling is common. At that time, a method for preventing any error caused by the shaft shift drive system is proposed in Japanese Patent Application Laid-Open No. Hei 6-31525. As a method of measuring the gap as directly as possible, the position of the circular blade is directly measured. Measurement method (Japanese Unexamined Patent Publication No. 9-9471)
No. 2) or a method of measuring and controlling the position (horizontal and vertical) of a specific portion (for example, an end) of a spindle equipped with a round blade.

In some cases, a method of manually measuring the gap amount before the start of cutting in order to cope with a gap change due to a change in the surrounding environment or the like has been adopted.

[0005]

However, in the method of directly measuring the position of the round blade, it is often impossible to install a measuring device due to the arrangement of equipment, while the method of indirectly measuring a part of the shaft shift drive system is not possible. In the method of converting the measured value into the gap amount, errors in the driving system (gear backlash, deformation, etc.)
Can not be completely avoided, and the gap accuracy (for example, gap amount
02mm ± 0.005mm).

[0006] Even in the gap adjustment method by measuring the position of the spindle end (opposite to the blade), which is used as a method for eliminating backlash of the gear as much as possible, expansion and contraction due to a temperature change from the axially fixed portion of the spindle to the round blade are prevented. For this reason, if the temperature of the spindle itself rises due to a change in ambient temperature or a cutting load, the gap accuracy cannot be obtained.

This is because a conventional trimming device incorporating a gap adjusting method by measuring the end position of a spindle is, for example, as shown in FIG. A push / pull device (cylinder or the like) 7 for axially moving a chock 6 that supports the spindle 5 via a fixed bearing 8 and a sliding bearing 9;
As shown in FIG. 6, the measurement value of the position measuring device S is converted into a gap, and the push-pull device 7 is operated so that the error between this conversion value (gap conversion value) and the gap setting value becomes zero. Have been. In FIG. 5, M is a motor serving as a spindle rotation drive source, and 10 is a rotational force transmitting unit (gear box or the like) for transmitting the rotational force of the motor M to the upper and lower spindles 5, 5.

In such a gap adjusting method, for example, the distance from the fixed bearing 8 of the upper spindle 5 to the round blade 2 is increased.
In the case of 200 mm, when the temperature of the upper spindle 5 rises by 10 ° C., the measured value of the position measuring device S does not change, but the actual gap is enlarged by 0.02 mm, and the gap accuracy required for cutting of 0.2 mm in thickness is 0.02 mm. The result is out of the control range of mm ± 0.005 mm, and the shape of the cut end is deteriorated as shown in FIG.

On the other hand, the temperature difference between the upper and lower knife axes (spindle) when the knife (round blade) clearance (gap) is initially set is defined as the initial temperature difference. Thermal expansion and contraction by heating and cooling the arbor shaft (spindle) according to the mechanism for controlling to maintain it (JP-A-3-149166) and the thickness of the material to be trimmed (artificial thickness change) Side trimmer to adjust the gap
However, these methods have a disadvantage in that the mechanism is complicated because a fluid passage is provided in the spindle and the temperature of the fluid sent to the spindle is changed. In addition, if the deviation of the spindle temperature due to an external factor is corrected by changing the temperature of the fluid flowing therein, it takes a long time to recover the temperature, so that the control response is poor.

The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide a method and an apparatus for trimming a steel strip which can suppress an accidental temperature change of a spindle equipped with a round blade by simple means and enable highly accurate automatic management of a gap amount.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a method of trimming a steel strip by cutting a steel strip with a shearing blade mounted on upper and lower spindles, wherein the spindle lubrication medium is operated to control the spindle temperature. This is a method for trimming a steel strip. The present invention also provides a strip steel trimming device for cutting a strip steel with a shearing blade mounted on upper and lower spindles, comprising a thermometer for measuring the temperature of the spindle, and supplying a fluid as a rotary lubricating medium for the spindle. A temperature controller and / or a flow control valve provided in the passage, wherein the temperature and / or flow rate of the lubricating medium passing through the supply passage can be adjusted according to the temperature measured by the thermometer. Trimming device.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The gist of the present invention is to control the spindle temperature by operating (changing the temperature and flow rate) the rotating lubricating medium (fluid) of a spindle equipped with a shearing blade. Such a lubricating medium is supplied to the bearing of the spindle and flows on the outer surface of the spindle. When the temperature or flow rate of the lubricating medium is changed, the spindle temperature changes quickly. Its responsiveness is several times higher than when the temperature of the fluid flowing inside is changed by making a hole in the spindle. Therefore, by measuring the spindle surface temperature and adjusting the lubricating fluid temperature, flow rate, or both in a direction that eliminates the difference between the measured temperature value and the set value, disturbance (change in ambient temperature, fluctuation in friction load, etc.) Etc.), the spindle temperature can be kept almost constant. Therefore, according to the present invention, the gap fluctuation due to the spindle temperature fluctuation due to the disturbance can be suppressed to a range that does not cause a problem, and a high accuracy can be achieved. Trimming becomes possible.

The present invention can be applied to an oil-air mixed fluid as a matter of course when the lubricating medium is only the lubricating oil. In such a case, it is preferable that the oil amount, the air amount, the air temperature, and the like be operated (adjusted). The above-described method of the present invention provides a strip steel trimming device for cutting a strip steel with a shearing blade mounted on upper and lower spindles, comprising a thermometer for measuring the temperature of the spindle, and a fluid that is a rotary lubricating medium of the spindle. A temperature controller and / or a flow control valve are provided in the supply path of the above, and it is easily carried out by a trimming device capable of adjusting the temperature and / or flow rate of the lubricating medium passing through the supply path according to the temperature measured by the thermometer. can do. That is, it can be implemented by a very simple means including a thermometer, a temperature regulator and / or a flow rate regulating valve, and connecting these with a simple control circuit.

The thermometer is preferably a non-contact thermometer, for example, a radiation thermometer, but may be a contact thermometer such as a thermocouple thermometer. As the temperature controller, a heat exchanger using a refrigerant or the like can be used.

[0015]

FIG. 1 is a front view of a main part of a trimming apparatus according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a thermometer, which in this example is a radiation thermometer, and a spindle portion 5A between a fixed blade 8 and a round blade (shear blade) 2 for each of the upper and lower spindles 5, 5. 5B is arranged to be able to measure the temperature. The lubricating oil, which is a lubricating medium, is sent from the tank 14 to the fixed bearing 8 by the pump 13 and used for lubrication of the spindle 5, and then returned to the tank 14 again for circulating use.
According to the present invention, an oil temperature controller 12 is provided in a supply path of the lubricating oil from the tank 14 to the fixed bearing 8. In this example, the oil temperature controller 12 used a heat exchanger using cooling water as a refrigerant. Although a supply path of the lubricating oil to the lower spindle 5 is not shown, an oil temperature regulator is also provided there. FIG.
The same reference numerals are given to the same or corresponding parts as in the conventional example, and the description is omitted.

FIG. 2 is a block diagram showing a spindle temperature control system in this embodiment. As shown in the figure, the temperature of the lubricating oil passing through the supply passage is changed by operating the oil temperature regulator 12 so as to minimize the temperature error by comparing the measured temperature of the thermometer 11 with the target temperature. For example, as described above, when the distance from the fixed bearing 8 of the upper spindle 5 to the cutting surface of the round blade 2 (design length of the spindle portion 5A) is 200 mm,
When the temperature of the upper spindle 5 rises by 10 ° C., the measured value of the position measuring device S does not change, but the actual gap 4 expands by 0.02 mm. The conventional example cannot handle this,
In the embodiment, as soon as the spindle temperature starts to rise due to a disturbance, the oil temperature of the lubricating oil is adjusted to return the spindle temperature to the set value. Therefore, the actual size of the gap 4 can be automatically and reliably set within the control range of 0.02 mm ± 0.005 mm in gap accuracy required when cutting a plate having a thickness of 0.2 mm.

Actually, in the conventional example, when the steel strip having a thickness of 2.0 mm or less is processed, the shape defect of the cut end frequently occurs. However, after switching to the embodiment, such a shape defect occurs. Has disappeared. Further, in the conventional example, in order to recognize a gap variation due to a change in the surrounding environment or the like, it is necessary to manually measure the gap amount before the start of cutting, but this is no longer necessary in the embodiment.

[0018]

As described above, according to the present invention, there is an excellent effect that accidental temperature change of the spindle can be suppressed by simple means in trimming of the steel strip, and the gap amount can be automatically controlled with high accuracy.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a trimming device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a spindle temperature control method in the embodiment.

FIGS. 3A and 3B are side views of main parts and FIG. 3B is a front view of main parts showing a general trimming situation.

FIG. 4 is a front view of a main part showing deterioration of the shape of the cut end when the gap is too wide.

FIG. 5 is a front view of a main part showing a conventional example of a trimming device.

FIG. 6 is a block diagram showing a conventional gap adjustment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip steel (material to be trimmed) 1A Ear dust 2 Round blade (shear blade) 3 Lapping 4 Gap 5 Spindle 6 Chock 7 Pushing / pulling device (cylinder etc.) 8 Fixed bearing 9 Sliding bearing 10 Rotational force transmitting part (gear box etc.) 11) Thermometer 12 Oil temperature controller 13 Pump 14 Tank

Claims (2)

[Claims] 1. A method for trimming a steel strip in which a steel strip is trimmed by a shearing blade mounted on upper and lower spindles, wherein the spindle lubrication medium is operated to control the spindle temperature. Method. 2. A strip steel trimming device for cutting a strip steel with a shearing blade mounted on upper and lower spindles, comprising a thermometer for measuring the temperature of the spindle, and a supply path for a fluid which is a rotary lubricating medium for the spindle. Wherein a temperature controller and / or a flow rate control valve are provided on the lubricating medium, and the temperature and / or flow rate of the lubricating medium passing through the supply path can be adjusted according to the temperature measured by the thermometer. apparatus.