JPH04304963A - Belt grinding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type grinding machine having a crown adjusting means for improving the sheet crown in the width direction of a material to be ground.

0002

2. Description of the Related Art For example, a grinding process using a grinding belt in a cold rolling process is used to remove surface defects of a material to be ground, and its quality is determined based on the surface defects after grinding.

A conventional belt grinding machine used in such a belt grinding process is shown in FIGS. In the same figure, 31 is a contact roll, a grinding belt 32 is wound between it and an idle roll 33, and the grinding belt 32 is driven by rotation of a motor 34. Reference numeral 35 denotes a billy roll, which is disposed opposite to the contact roll 31 and is pressed against the contact roll 31 when the rod of the cylinder 36 moves in and out. A material to be ground 37 is inserted between the contact roll 31 and the billy roll 35, and its surface is ground by a grinding belt 32. That is, the grinding belt 32 is rotated by driving the contact roll 31 by the motor 34, and the billy roll 35 is pressed against the material to be ground 37 by the movement of the rod of the cylinder 36, and the degree of this pressing, that is, the grinding load is This will ensure the amount of grinding.

0004

However, in the conventional belt grinding machine as described above, due to the pressing of the billy roll 35 against the material to be ground 37, the contact roll 31 and the billy roll are separated as shown in FIG. 11(a). 35's deflection increases. As shown in the figure (b), the pressure distribution in the width direction becomes larger as it gets closer to the edge of the material to be ground 37, so as shown in the figure (c), there is a difference in the amount of grinding in the width direction. This causes a problem in that the closer the plate is to the edge, the thinner the plate becomes. Here, the deviation in the cross-sectional shape of the surface of the material to be ground 37 (hereinafter referred to as "sheet crown")
As shown in FIG. 12, this can be roughly divided into a range A that can be approximated to a quadratic curve and a range B of the edge drop portion that shows a rapid decrease in plate thickness. However, this seat crown
The deflection of the contact roll 31 and billy roll 35 is
Since it changes depending on the grinding load, the thickness and width of the material 37 to be ground, etc., it cannot be constant.

[0005] Thus, in belt grinding, the pressure distribution in the width direction between the material to be ground and the grinding belt increases toward the edge of the plate, so that the sheet crown of the material to be ground increases. Also, if the surface defects of the material to be ground are minor, the amount of grinding is small, and the sheet crown is not much different from before grinding, but the surface defects extend to the inside of the material to be ground, and it is necessary to completely remove them. When increasing the grinding pressure or belt grinding
When repeating ~4 passes, or when removing surface defects from soft materials, an increase in sheet crown is unavoidable. Such a significant increase in sheet crown causes problems such as shape defects and edge cracks during rolling in the subsequent process, resulting in sheet breakage and deviations from the sheet thickness tolerance at the sheet ends, which deteriorates yield. was.

In view of the above-mentioned conventional problems, the present invention provides a belt-type grinder that can control the seat crown of the material to be ground by equalizing the pressure distribution in the width direction between the material to be ground and the grinding belt. This was done for the purpose of providing an opportunity.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the belt type grinding machine of the present invention provides at least one of a billy roll pressed against a workpiece to be ground by a pressing device and a contact roll that drives a grinding belt. The roll has a crown adjustment means for the roll.

In addition to the above-mentioned means, the belt-type grinding machine of the present invention also includes plate thickness detection means for detecting the thickness of the material to be ground in the width direction, and an arithmetic device for calculating the required amount of grinding from the detection result. and a control means for controlling the crown adjustment means based on the calculation result.

In addition to the first means, the belt type grinding machine of the present invention also includes a measuring means for measuring the grinding load due to the pressing of the billy roll, and a measuring means for calculating the necessary deflection correction amount from the measurement result and adjusting the crown of the roll. a calculation device that sets the amount;
It also includes a control means for controlling the crown adjustment means based on the calculation result.

0010

[Operation] According to the above-described means, the pressure distribution in the width direction between the workpiece to be ground and the grinding belt is made uniform by the action of the roll having the crown adjustment means, and the sheet crown due to grinding of the workpiece by the grinding belt is achieved. This will suppress the increase in Moreover, the adjustment control of the seat crown can be controlled in real time by controlling it in response to the detection result by the plate thickness detection means. Also,
Further, from the measurement results of the grinding load, crown adjustment control corresponding to the load can be performed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to FIGS. 1 to 9. FIG. 1 is a configuration diagram showing a first embodiment. In the same figure, 1 is a contact roll and 2 is a billy roll, which are arranged opposite to each other. Material to be ground 3
Grinding is performed on the surface by sandwiching the material. Grinding is performed by a grinding belt 5 wound between the contact roll 1 and the idle roll 4, and its rotational drive is performed by a motor 6 that drives the contact roll 1. The billy roll 2 is pressed against the material to be ground 3 by the movement of the rod of the cylinder 7 into and out. Note that 8 is a bearing of the billy roll 2.

In the embodiment shown in FIG. 1, the billy roll 2 has roll surface profile adjusting means (hereinafter referred to as "
The contact roll 1 is a roll having a crown adjustment means (referred to as "crown adjustment means"), and is configured to have a surface profile in the same direction as the surface profile of the contact roll 1, as shown in the figure. The crown adjustment means (described later) of the Viriroll 2 is controlled by the crown adjustment control means 9, and the material to be ground 3 is ground while maintaining the adjusted state.

FIG. 2 shows the surface profile of the roll, the widthwise grinding pressure distribution, and the widthwise grinding amount distribution in the embodiment shown in FIG. 1. In other words, (a)
As shown in the figure, the surface profile 2a of the billy roll 2, which is disposed opposite to the surface profile 1a of the contact roll 1 with the material to be ground 3 interposed therebetween, is adjusted to be substantially parallel to the surface profile 1a of the contact roll 1. The grinding pressure applied by both the rolls 1 and 2 has a substantially uniform pressure distribution in the width direction, as shown in FIG. Furthermore, as a result, (c)
As shown in the figure, the amount of grinding in the width direction is made uniform, and the difference in plate thickness in the width direction can be eliminated.

Next, FIG. 3 shows a case in which the above-mentioned crown adjusting means is provided on the contact roll 1 side. Figure (B) shows the grinding pressure distribution in the width direction, and Figure (C) shows the grinding amount distribution in the width direction. In this case, as in the case of FIG. 2 described above, the pressure distribution and the grinding amount distribution can be made almost uniform.

A specific example of the roll having the above-mentioned crown adjusting means will be described below with reference to FIGS. 4 to 8.

The roll shown in FIGS. 4(A) and 4(B) (hereinafter referred to as "bearing roll") has a sleeve 12 fitted around a curved arbor 10 so as to be rotatable via a bearing 11. The arbor 10 is fixed at an arbitrary angle by an arbor angle adjustment device (not shown) attached to the end of the arbor 10, and the roll crown is adjusted. Here, the arbor adjustment angle is 90° in figure (a) and 0° in figure (b).
It is assumed that the arbor angle adjustment device is controlled by the control means 9 described above.

Next, the rolls shown in FIGS. 5(a) and 5(b) are as follows:
The bearing roll is similar to that shown in Fig. 4 above, but the arbor 1
A sleeve 15 is rotatably mounted on the outside through a plurality of bearings 14 fixed at an angle with respect to the arbor 13, and an arbor angle adjustment device (not shown) attached to the end of the arbor 13 is used to adjust the angle of the arbor 13 as described above. The arbor 13 is fixed at an arbitrary angle and the roll crown is adjusted.

Next, the roll shown in FIGS. 6(A) and 6(B) (hereinafter referred to as "VC roll") has a steel sleeve 17 shrink-fitted to the arbor 16, and a pressure receiving chamber 18 provided in the center is filled with high pressure oil. The roll crown is adjusted by introducing the sleeve 17 and inflating the sleeve 17. In addition to the above configuration, the crown adjustment in this example is performed continuously from 0 to the maximum value by controlling the introduced hydraulic pressure from 0 to the maximum pressure P using a pressure unit (not shown) (corresponding to the control means 9 described above). Adjustable. Note that Figure (A) shows a state where the introduced oil pressure is 0, and Figure (B) shows a state where the introduced oil pressure is P, respectively.

Next, the roll shown in FIGS. 7(a) and 7(b) (hereinafter referred to as "TP roll") has a steel sleeve 20 shrink-fitted to the arbor 19, and high-pressure oil is supplied to the oil chambers 21, 22, and 23. The roll crown is adjusted by moving the inner piston 24 and outer piston 25 in the roll axis direction. That is, the crown adjustment in this example is performed by changing the pressure in the oil chambers 21, 22, and 23 using a pressure unit (not shown) (corresponding to the above-mentioned control means 9).
By moving the inner piston 24 and outer piston 25 from the roll center side to the roll end side,
It is continuously adjustable from 0 to the maximum value. here,(
A) The figure shows the piston position at the center of the roll, and the figure (B) shows the piston at the end of the roll. Further, in this example, for simplicity, the sleeve 20 on the outer periphery may be made of rubber, and the inner piston 24 and the outer piston 25 may be moved by, for example, a screw type without using hydraulic pressure.

Next, the roll shown in FIG. 8 is a bearing roll in which the arbor 10 is made into a trapezoidal shape, and the grinding pressure is reduced only at the edge of the plate of the material 3 to be ground. This is effective when the amount of grinding is relatively small and edge drop only at the edge of the plate is a problem. Of course, it goes without saying that even higher precision can be achieved by combining with any of the above-mentioned rolls.

[0021] In any of the above rolls, if the sleeve is made of steel, a rubber lining or a rubber sleeve may be fitted therein. Further, particularly when a bearing roll is used, a helper drive mechanism (not shown) may be provided to drive the belt.

By introducing the roll having the crown adjusting means configured as described above into at least one of the contact roll 1 or the billy roll 2, the roll crown can be adjusted and controlled according to the operating conditions, and the material to be ground can be adjusted. The grinding pressure distribution in the width direction of the plate can be optimized, and as a result, the grinding amount distribution in the width direction of the plate can be made uniform.
Moreover, it becomes possible to reduce plate thickness deviation.

FIG. 9 shows another embodiment. First, a thickness gage 26 is installed on the entrance or exit side of the stand of the belt grinding machine, and the thickness of the material to be ground 3 in the width direction is detected by the thickness gage 26. Based on the detection result, the calculation device 27 The necessary grinding amount is calculated by the calculation device 27, and the control means 9 is operated based on the calculation result of the calculation device 27 to control the setting of the crown adjustment means of the roll 2. Complete automation is possible through roll crown adjustment control. here,
The thickness gauge 26 is either a contact type or a non-contact type, and the contact type has displacement gauges installed on the front and back surfaces of the non-abrasive material 3 and detects the plate thickness based on the displacement difference. For example, the plate thickness is detected using a radiation thickness meter. Five to nine detection points are taken in the width direction, and in the contact type, displacement meters are arranged in parallel as many as the number of detection points, and in the non-contact type, the thickness gauge is scanned in the width direction of the plate to detect the plate thickness distribution.

In addition, in FIG. 9, by providing a measuring means 28 for measuring the grinding load from the force of the cylinder 7 pressing the billy roll 2 against the workpiece 3, the grinding load output detected by the measuring means 28 can be adjusted. The computing device 2
7, and the calculation device 27 calculates the required deflection correction amount from the deflection amount generated in the billy roll 2 determined based on the detected grinding load, and controls the control means 9 based on the result. It is also possible to control the crown adjustment means of the billy roll 2 to ensure a good grinding condition.

[0025] The belt type grinding machine as described above usually has a line consisting of 3 to 5 stands, and ideally all stands are equipped with rolls having crown adjustment means as described above, and each It is sufficient if the stand performs uniform grinding in the board width direction of the material to be ground, but if it is installed in at least one stand, it is possible to eliminate the board thickness deviation on the exit side of the final stand. That is, in the stand where the roll is installed, the crown adjustment means of the roll is controlled so as to compensate for the plate thickness deviation that occurs in other stands, and the amount of grinding at the center of the material to be ground in the width direction is increased in this stand. If this is done, the thickness deviation at the exit side of the final stand can be significantly reduced.

Next, a specific example to which the present invention is applied and its results will be explained.
A roll having crown adjustment means is applied to the contact roll of a stand belt type grinder. In addition, a belt-shaped plate of SUS 304 stainless steel (dimensions t3.6 mm x w1250 mm) was used as the material to be ground, and the plate thickness distribution in the width direction before grinding and after 4-stand grinding was measured. The measurement results are shown in Tables 1 and 2 below.

[0027]

[Table 1]

[0028]

[Table 2]

Tables 1 and 2 show the application method of each of the above-described embodiments of the present invention, and the seat crown S. C (%) and edge drop E. which is also expressed in FIG. 12 and Formula 2. D (μm) and the incidence of edge cracking (%) occurring during rolling are shown.

[0030]

[Math 1] S. C={hc-(hL + hR)/2}/hc

0
031]

[Math 2] E. D={(hL1+hR1)-(hL+hR)}/
2

From Table 1, it can be seen that in FIGS. 4 to 8 described above as an example of the roll crown adjusting means, the sheet crown S. C and edge drop E. It is clear that D was improved. In addition, from Table 2, it is clear that providing crown adjustment means for all stands can reduce the seat crown, edge drop, and edge cracking occurrence rate, and even in the case of one stand, it is more effective to provide it on the last stand. I understand that.

[0032]

As explained above, according to the method of the present invention, by providing a roll having a crown adjustment means, the pressure distribution in the width direction between the material to be ground and the grinding belt is made uniform, and the pressure distribution of the material to be ground is made uniform. It is possible to suppress the sheet crown, and it is possible to prevent shape defects, edge cracks, and plate breakage caused by edge cracks in the subsequent rolling process, as well as deviations from the plate thickness tolerance dimension at the edge of the plate, and is expected to improve yield. It is possible. In addition, by controlling the adjustment of the seat crown in accordance with the detection results of the plate thickness detection means,
Can be controlled in real time. Furthermore, it is a very effective invention as it is possible to perform crown adjustment control corresponding to the load based on the measurement result of the grinding load.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a belt-type grinder according to an embodiment of the present invention.

[Figure 2] (A) is the surface profile of the roll when the billy roll side has a crown adjustment means, (B) is a distribution diagram of the grinding pressure in the width direction, and (C) is the distribution of the amount of grinding in the width direction. It is a diagram.

[Figure 3] (A) is the surface profile of the roll when the contact roll side has a crown adjustment means, (B) is a distribution diagram of the grinding pressure in the width direction, and (C) is the grinding amount in the width direction. It is a distribution map.

FIGS. 4A and 4B are cross-sectional views of a first example of a roll having a crown adjustment means at arbor adjustment angles of 90° and 0°; FIGS.

[Fig. 5] (a) and (b) are arbor adjustment angles 90 of the second example.
It is a sectional view at 0° and 0°.

6A and 6B are cross-sectional views of the third example at introduction oil pressures of 0 and P; FIG.

FIGS. 7A and 7B are cross-sectional views of the fourth example in which the piston positions are on the roll center side and on the roll end side.

FIG. 8 is a sectional view showing the fifth example.

FIG. 9 is a configuration diagram showing a belt-type grinder according to another embodiment of the present invention.

FIGS. 10A and 10B are a side view and a front view showing the configuration of a conventional belt-type grinding machine.

FIG. 11A is an explanatory diagram showing the deflection status of the contact roll and the billy roll, and FIGS. 11B and 11C are distribution diagrams of the grinding pressure and grinding amount in the width direction of the plate.

FIG. 12 is an explanatory diagram of the plate thickness deviation (sheet crown) of the material to be ground in the plate width direction.

[Explanation of symbols]

1 Contact roll 2 Billy roll 3 Material to be ground 5 Grinding belt 9 Control means 26 Thickness gauge 27 Arithmetic device 28 Grinding load measuring means

Claims (3)

[Claims] 1. A belt type, characterized in that at least one of the billy roll pressed against the material to be ground by a pressing device and the contact roll that drives the grinding belt is a roll having crown adjustment means for the roll. grinding machine. [Claim 2] A plate thickness detection means for detecting the thickness of the material to be ground in the width direction, an arithmetic device for calculating the required amount of grinding from the detection result, and a crown adjustment means for controlling the crown adjustment means based on the calculation result. The belt type grinding machine according to claim 1, further comprising a control means. 3. Measuring means for measuring the grinding load due to the pressing of the billy roll, and an arithmetic device for calculating the necessary deflection correction amount from the measurement results and setting the crown amount of the roll.
The belt-type grinding machine according to claim 1, further comprising a control means for controlling the crown adjustment means based on the calculation result.