JP3348011B2 - Strip steel trimming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

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 shafts (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,
To provide a strip steel trimming method capable of automatically correcting a gap variation between round blades caused by an accidental temperature change of a spindle equipped with a round blade by simple means and enabling high-precision automatic management of a gap amount. Aim.

[0011]

The present invention SUMMARY OF] is the axial position of the spindle fitted with shearing blades are measured, strip while controlling the gap amount between the shearing blades in a predetermined range based on the position measurement value in method of trimming strip to trim the temperature of the spindle is measured, using a thermal expansion amount of the spindle calculated from the temperature measurement value, to correct the gap in terms of values derived from the position measurement value
Is a method of trimming strip, characterized by controlling the gap amount by.

[0012]

According to the embodiment of the present invention, before as well as measuring the axial position of the spindle fitted with a shearing blade, also measures the temperature of the spindle, was calculated from the temperature measurement value
Using the thermal expansion and contraction amount of the spindle, from the position measurement value
Since the gap size (gap amount) is controlled by correcting the derived gap conversion value ,
Round blade (shear blade) caused by accidental temperature change of spindle
The gap variation between them can be quickly and automatically corrected.
Further, as is obvious from the configuration, the present invention can be implemented by a very simple means of measuring the temperature of the spindle.

The measurement of the spindle temperature is preferably performed by a non-contact type thermometer, for example, a radiation thermometer. Incidentally, the measurement of the axial position of the spindle is performed by a method of directly measuring the position of the end of the spindle with a distance meter or the like, or a method of indirectly measuring the operation amount of the shaft shift drive system as in the related art. Either may be performed.

[0014]

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, T is a thermometer, which is a radiation thermometer in this example. The upper and lower spindles 5, 5 are provided with spindle portions 5A, 5B between a round blade (shear blade) 2 and a fixed bearing 8 respectively. It is arranged to be able to measure temperature. The same or corresponding parts as in the conventional example of FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. The position measuring device S was constituted by a laser distance meter. FIG. 2 is a block diagram showing a gap adjusting method in this embodiment. In this example, the gap conversion value derived from the measurement value of the position measuring device S is corrected based on the measurement value of the thermometer T. Specifically, the thermal expansion and contraction amounts of the upper and lower spindle portions 5A and 5B in the axial direction are calculated from the upper and lower temperature measurement values, and the difference between them is added to the gap conversion value.

For example, when the distance from the fixed bearing 8 of the upper spindle 5 to the round blade 2 (design length of the spindle portion 5A) is 200 mm as described above, the temperature of the upper spindle 5 becomes lower.
When the temperature 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. In the conventional example, this cannot be dealt with, but in the embodiment, this enlargement can be added to the gap conversion value.
Can be pulled by this enlargement, so that the actual size of the gap 4 is automatically and reliably set within the control range of 0.02 mm ± 0.005 mm required for cutting a 0.2 mm-thick plate. be able to.

In fact, in the conventional example, when processing a steel strip having a thickness of 2.0 mm or less, the shape defect at the cut end frequently occurred. However, after switching to the embodiment, such a shape defect occurred. 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.

[0017]

Thus, according to the present invention, it is possible to automatically correct the gap fluctuation between the round blades caused by an accidental temperature change of the spindle with the round blades in the strip trimming by simple means, and to increase the gap amount. An excellent effect that automatic control of accuracy is enabled is achieved.

[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 illustrating a gap adjustment 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) 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 transmission part (Gearbox etc.) M Motor S Position measuring device T Thermometer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-149116 (JP, A) JP-A-58-157521 (JP, U) JP-A-2-74118 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) B23D 19/06

Claims (1)

(57) [Claims] 1. A measuring the axial position of the spindle of the shearing blades attached, method of trimming strip for trimming the strip while controlling the gap amount in a predetermined range between the shearing blades on the basis of the position measurement value in the spin and the temperature of the spindle is measured, calculated from the temperature measurement value
Derived from the position measurements using the amount of thermal expansion and contraction of the dollar
Wherein the gap amount is controlled by correcting the gap conversion value .