JPH1190797A - Grinding wheel polishing method for cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To polish the whole length of a cylindrical body into a uniform diameter, even if a direct operation accuracy in moving a polishing grinding wheel of a polisher along the cylindrical body is low, by polishing the cylindrical body in such a way as setting the frequency of the polishing to be proportional to the dimension of the diameter and by holding the pressure at constant. SOLUTION: A cylindrical body W is polished by a polishing grinding wheel 27. In this case, sections 1, 2, 4, 6, 8, 12, 14, 16 of polishing allowance parts which are larger than the minimum diameter value before polishing are polishingly moved by the frequency proportional to the diameter value before the polishing. In this case, sections in which the polishing allowance parts having equal diameter values are continuously present are reciprocatingly polished. In moving to sections 3, 5, 7, 9, 11, 13, 15, 17 where polishing allowance parts are separated, the polishing grinding wheel 27 and the cylindrical body W are moved without separated from their close sticking states, while substantially setting the polishing pressure to zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cylindrical body having a uniform diameter over its entire length even if the cylindrical body has a low cylindrical precision before the cylindrical body is polished, or even if a cylindrical polishing apparatus having a low cylindrical polishing precision is used. As described above, the present invention relates to a method for polishing a grindstone of a cylindrical body, which can obtain extremely high cylindrical polishing accuracy in a short time.

[0002]

2. Description of the Related Art If the middle diameter of a plate making roll is larger or smaller than the diameters of both ends, printing will be poor, and the plate making roll is required to have extremely high cylindrical accuracy. Further, a rolling roll for rolling a steel sheet is required to have higher cylindrical accuracy in order to obtain a uniform thickness. However, when the cylindrical grinding of the cylindrical body is performed with the grinding wheel polishing device, the surface of the grinding wheel gradually collapses, so that the cylindrical grinding is performed by correcting the amount and performing the cylindrical grinding. .

[0003]

However, when the cylindrical precision of the cylindrical body before the cylindrical polishing is low, the cylindrical precision with the above-mentioned conventional correction does not always increase the cylindrical precision. When the cylinder is polished from one end to the other end of the cylinder at one time with a large grinding allowance by making corrections with a grinding stone polishing device with high cylindrical accuracy, the cylindrical polishing that reflects the cylindrical accuracy of the cylindrical body before cylindrical polishing is reflected as it is Only accuracy can be obtained. Even if the cylindrical body of the cylindrical body before polishing is low, in order to obtain high cylindrical precision, use a grindstone polishing device with extremely high cylindrical precision and compensate for the amount by which the surface of the grinding wheel gradually collapses It was necessary to eliminate the difference between the diameters of the middle and both ends of the cylindrical body by repeating the process of polishing the cylinder so as to obtain a very small polishing allowance. Then, after cylindrical polishing, it is necessary to remove the cylindrical body and place it on a measuring instrument to measure the cylindrical precision.If the cylindrical precision is not obtained, the cylindrical body is again precision cylindrically polished and the cylindrical precision is again measured. Since the measurement was repeated, it was very complicated and time-consuming. Also, when cylindrical polishing is repeated,
There was a fear that the diameter of the cylindrical body became too small.

The present invention has been made in view of the above points, and has been made in consideration of a reciprocating motion proportional to the difference between the pre-polishing diameter value and the pre-polishing minimum diameter value for a pre-polishing diameter value larger than the pre-polishing minimum diameter value. By performing the polishing several times, the cylindrical body can be precisely polished to a uniform diameter by a short ultra-light polishing process, and furthermore, polished to a uniform diameter and then continuously polished from one end to the other end of the cylindrical body The object of the present invention is to provide a method for polishing a grindstone of a cylindrical body, which does not need to be performed once, and does not need to measure cylindrical accuracy after polishing.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a polishing wheel is brought into close contact with a cylindrical body and a polishing pressure is maintained at a minimum value of a measured diameter value of each section measured at a constant pitch from one end to the other end of the cylindrical body. The diameter before polishing was corrected to a value approximating to be four times as large as the single polishing dimension when moving in one direction while keeping the polishing wheel in close contact with the cylinder, and the polishing pressure was kept constant. A cylindrical body polishing method of polishing the cylindrical body to have a uniform diameter value until there is no polishing margin larger than the minimum diameter value before polishing by polishing while repeating reciprocating movement, the minimum diameter before polishing. Polishing movement of the section of the polishing allowance portion larger than the value is repeated by the number of times proportional to the diameter value before polishing, and at that time, the section where the polishing allowance portion having the same diameter value is continuously present is reciprocally polished, and the polishing allowance portion is separated. When moving to a section where There is provided a method of polishing a cylindrical body, characterized in that to move in the substantially zero polishing pressure keep an adhesion of grinding grindstone and the cylindrical body.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a cylindrical polishing apparatus for carrying out a method for polishing a grindstone of a cylindrical body according to the present invention will be briefly described with reference to FIG. Both ends of the cylindrical body W are chucked and rotated by a chuck cone 21a rotated by a motor (not shown) and a chuck cone 21b pivotally supported by a bracket of a linear motion device (not shown). Sign 2
An X table 2 is movable in the X direction (parallel to the cylindrical surface of the cylindrical body W). Reference numeral 23 denotes an XY table, which is mounted on the X table 22 and is movable in the X direction, and is moved in the Y direction (at right angles to the cylindrical axis of the cylindrical body W) by a Y direction moving device 24 attached to the X table 22. Direction). Reference numeral 25 denotes a movable bracket, a cylinder device 26 provided on the XY table 22,
It is supported by the 26 pistons 26a, 26a and is movable in the Y direction. Reference numeral 27 denotes a grinding wheel, and a shaft 28 is pivotally supported by a bearing 29 provided on the XY table 23 and is rotated at a high speed by a motor 30 provided on the XY table 23. Code 3
Reference numeral 1 denotes a blower for generating high-pressure air, which is mounted on the X table 22 and supplies high-pressure air to the cylinder devices 26, 26. The controller not shown is a cylinder device 2
By inputting a signal from a pressure sensor (not shown) attached to each of the cylinders 6 and 26, the cylinder pressure can be freely adjusted so that the polishing pressure for pressing the grinding wheel 27 against the cylindrical body W matches the polishing data instructed by the controller. it can. Therefore, this cylindrical polishing apparatus rotates the cylindrical body W after bringing the grinding wheel 27 close to the cylindrical body W and switches the electromagnetic three-way valve (not shown) to extend the cylinder devices 26, 26. Polishing can be performed at a constant pressure in close contact with W, cylindrical polishing can be performed by moving the X table 22, and further, the cylinder devices 26, 26 can be switched from the extending operation state to the electromagnetic three-way valve to perform the extension operation. When another electromagnetic two-way valve (not shown) for communicating the cylinder chamber with the atmosphere is closed, the piston retreats, so that the grinding wheel 27 can be kept in close contact with the cylindrical body W. When the two-way valve is switched at the same time, high-pressure air can be supplied to the cylinder chamber in the extension operation again, and the cylindrical body W can be polished again with the polishing grindstone 27 at a constant pressure.

Next, a method for polishing a grindstone of a cylindrical body according to the first embodiment of the present invention will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows the chuck cone 21a.
The figure shows that the cylindrical body W, which is chucked at both ends by the chuck cone 21b and is rotated, is polished by the polishing grindstone 27, and the numerical value in the figure is obtained by correcting the measured diameter value of each section at a constant pitch of the cylindrical body W. Shows the diameter value before polishing. FIG. 2 (a)
Indicates the diameter at a position 10 mm away from one end of the cylindrical body W, then measures the diameter at a 30 mm pitch, and indicates a place 10 mm away from the last measurement point to the other end of the cylindrical body W. The diameter was measured to the third decimal place and rounded to the third decimal place. The polishing grindstone 27 is adjusted so that the polishing pressure is adjusted so that a single polishing dimension when moving in one direction while keeping the polishing pressure constant while being in close contact with the cylindrical body W is 2.5 microns. And the grinding wheel 2
When the cylinder 7 is polished once, the cylindrical body W is polished so that the diameter becomes smaller by 10 microns. Therefore, since the minimum value of the diameter before polishing in each section is the second decimal place, the polishing size of a single grinding wheel is 2.5 microns, so that the polishing size is four times as large as the single polishing size. Value has been corrected. FIG.
(B) illustrates the movement of the grinding wheel by indicating the diameter value of each section of the cylindrical body before polishing by a bar graph of block stacking and the order of removing the blocks by arrows and numbers. In the figure, the numerical value on the left is the diameter value, and one division is 5 microns calculated by the radius value length. Therefore, the height of one block is 5 microns. Since the polishing size of the polishing wheel at one time is 2.5 microns, one block can be removed by making one round trip of the polishing wheel. Below, through the explanation of the order of removing blocks,
The concept that the diameter finally becomes uniform will be described conceptually. If the blocks are stacked, removing the lower block will lower the blocks stacked on it by one step. Actual polishing cannot be performed first from the inside. However, it can be considered that the polishing in a certain section is conceptually determined to be not the polishing of the uppermost block but the polishing of the lower block, and the polishing is performed with a smaller diameter. Then, the polishing wheel 27 is brought into close contact with the cylindrical body W, and the polishing pressure is kept constant so that the polishing size at one time becomes 2.5 μm, and reference numerals 1 to 18 attached to the arrows in FIG. By repeating the reciprocating movement in the order shown in (1) and removing the block that has been polished once, the entire length of the cylindrical body can be polished to a small uniform diameter that is polished once more than the minimum diameter value before polishing. The order of movement indicated by reference numerals 1 to 18 attached to the arrows in FIG. 2B conforms to the following rules. Blocks corresponding to a polishing margin portion larger than the minimum diameter value before polishing are indicated by reference numerals 1, 2, 4, 6, 8, 10, 12, 14, 1 attached to arrows in FIG.
6 can be removed in the order in which the reciprocating polishing is completed. Reference numerals 3, 5, 7, and 4 attached to dotted arrows in FIG.
9, 11, 13, 15, and 17 indicate that the polishing pressure is substantially reduced to zero without moving the grinding wheel 27 and the cylindrical body W in close contact with each other when moving to a section where the polishing allowance portion is away. Is shown. Therefore, since the blocks are stacked in proportion to the diameter value before polishing, the blocks corresponding to the polishing allowance portion larger than the minimum diameter value before polishing in each section reciprocate the polishing movement by the number of the stacked blocks. You can remove them all when you do. By performing reciprocating polishing of, for example, reference numeral 1 in FIG. 2B, conceptually removing blocks at the same stage means that if the polishing allowance portion of each section exists continuously, the continuous section is reciprocally polished. It means to do.
In addition, for example, by performing reciprocating polishing of reference numeral 2 in FIG. 2B and reciprocating polishing of a continuous section so as to conceptually remove blocks of the same stage, a block of a reciprocating section of reference numeral 4 and a reciprocating section of a reference numeral 6 are obtained. It will be separated into blocks. Therefore, the grinding wheel is moved in the direction indicated by the reference numeral 3 with the polishing pressure set to zero and the cylindrical member W in contact with the cylindrical body W without being polished.
Then, the block in the arrow section of the reference numeral 4 is removed by performing reciprocating polishing, and then the arrow section of the reference numeral 3 is moved to the cylindrical body W in a state in which the polishing pressure is set to zero and the polishing is performed in a state in which the block is in close contact with the cylindrical body W without polishing. Reciprocating polishing is performed to remove the block in the section indicated by the arrow 6. Further, reference numeral 16 in FIG.
When the reciprocating polishing is performed, the polishing is performed to a uniform diameter value equal to the minimum diameter value before polishing. In this embodiment, the section indicated by the reference numeral 17 is moved to the direction indicated by the arrow 17 without polishing while the polishing pressure is set to zero, and the cylinder 18 is reciprocally polished. Is smaller than the minimum diameter value before polishing by one reciprocating polishing to a small uniform diameter. It is impossible to perform actual polishing first from the inside, but as described in the order of removing the blocks above, moving the grinding wheel polishing, the state where the diameter of the cylindrical body becomes smaller, as if the lower block By removing the upper block, the upper block can be dropped one step, and it can be conceptually grasped so as to correspond to the order in which the blocks are removed.As a result, the necessary minimum grinding wheel movement moves the entire length of the cylindrical body before polishing. Precision polishing can be performed so as to have a uniform diameter smaller than the minimum diameter by one round trip. The polishing of reference numeral 18 in FIG. 2B is not an essential requirement of the present invention. The reason is that the diameter becomes uniform when the polishing of reference numeral 17 is completed. In addition, if the polishing of the reference numeral 18 is an essential requirement, the polishing of the reference numeral 18 may be performed by removing the cylindrical body and attaching the cylindrical body to another polishing apparatus when the polishing of the reference numeral 16 is completed. In addition, if the rotation of the grindstone and the rotation of the cylindrical body for polishing in the backward direction indicated by reference numeral 18 are made to be opposite rotations to the previous rotation, the polishing eye can be eliminated.

FIG. 3 is a diagram showing another moving order of the grinding wheel. In this embodiment, the moving order is such that the polishing is performed from the upper stacked block corresponding to the large diameter value. The order of the reciprocating polishing and the magnitude of the stroke of the symbols 2, 4, 6 and 7 are such that the relationship of the polishing order is opposite to the relationship of FIG. 2. Similarly, the relationship between the order of the reciprocating polishing and the magnitude of the stroke of the symbols 9, 11, 13, 15 and 17 is opposite to the relationship of FIG. 2. In the reciprocating polishing of reference numerals 13 and 19, the relationship between the magnitude of the stroke and the polishing order is reversed. This indicates that the moving order of the polishing grindstones in the method for polishing a cylindrical grindstone of the present invention has a wide range. That is, it is not an essential requirement that the polishing corresponding to the lower block be performed before the polishing corresponding to the upper block. The essential requirements for determining the order of movement of the grinding wheels are as follows. For the polishing allowance part larger than the minimum diameter value before polishing,
Polish the number of reciprocations in proportion to the diameter value before polishing. At this time, when a polishing margin portion having the same diameter value exists continuously in a plurality of sections, reciprocating polishing is performed on the continuous section. When moving to a section where the polishing allowance portion is separated, the polishing pressure is substantially reduced to zero without moving the polishing wheel and the cylindrical body in close contact with each other. In addition, if the rotation of the grindstone and the rotation of the cylindrical body in the backward direction of the reference numeral 19 are made to be opposite rotations to the previous rotation, the polishing eye can be eliminated.

[0009]

As described above, according to the method for polishing a grindstone of a cylindrical body of the present invention, even if the cylindrical precision of the cylindrical body before the cylindrical polishing is low, the cylindrical body can be lightly polished in a short time. Precision polishing to a uniform diameter over the entire length. Since the number of polishings is proportional to the diameter and the polishing is performed with the pressure kept constant, the cylindrical body is made to have a uniform diameter over the entire length even when the linear motion accuracy of moving the grinding wheel of the polishing device along the cylindrical body is low. Polishing can be performed and a polishing apparatus having a low cylindrical polishing accuracy can be improved from a soft surface to a very high cylindrical polishing accuracy. Since the polishing is performed while keeping the pressure constant, it is not necessary to make correction for the gradual collapse of the surface of the grinding wheel. Polishing and removing the entire length of the cylindrical body, measuring it, detecting the place with a large diameter, chucking the polishing device again and polishing many times, compared to the conventional cylindrical body polishing method that repeats many times Polishing cylindrical body. As compared with the conventional cylindrical body polishing method in which a minute dimension corresponding to the decrease of the grinding wheel during polishing is detected and correction is performed as needed, highly accurate cylindrical body polishing can be performed. The cylindrical body can be polished to a uniform diameter over the entire length just by moving repeatedly and reciprocating polishing without performing continuous cylindrical polishing from one end to the other end of the cylindrical body, and from one end to the other end of the cylindrical body One continuous cylindrical polishing is sufficient. There is no fear that the diameter of the cylinder becomes too small. Therefore, the thickness of the ballad plating of the plate making roll can be made smaller than before, which is economical. It is sufficient to measure the cylinder accuracy only once before polishing the cylinder, and it is not necessary to remove the cylinder after the cylinder polishing and place it on a measuring instrument to measure the cylinder accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a cylindrical polishing apparatus for carrying out a method for polishing a grindstone of a cylindrical body according to the present invention.

FIG. 2 is a view for explaining a method for polishing a grindstone of a cylindrical body according to the first embodiment of the present invention. (A) shows the pre-polishing diameter value for each constant pitch of the cylindrical body when the cylindrical body is polished with a polishing grindstone. (B) is a diagram for explaining the movement of the polishing grindstone by indicating the pre-polishing diameter value of each section of the cylindrical body by a bar graph of a block stack and indicating the order of removing the blocks by arrows and numbers.

FIG. 3 is a diagram for explaining a grinding wheel polishing method for a cylindrical body according to a second embodiment of the present invention, wherein a diameter value before polishing of each section of the cylindrical body is shown by a bar graph of block stacking and a block diagram. FIG. 4 is a diagram for explaining the movement of the polishing grindstone by indicating the order of removing the grinding wheels by arrows and numbers.

[Explanation of symbols]

 W: Cylindrical body 27: Polishing whetstone

Claims (1)

[Claims] 1. A polishing whetstone is brought into close contact with a cylindrical body and moves in one direction while maintaining a constant polishing pressure for a minimum value of a measured diameter value of each section measured at a constant pitch from one end to the other end of the cylindrical body. The diameter before polishing of each section was corrected to a value approximating to be four times the single polishing dimension at the time, and the polishing wheel was brought into close contact with the cylindrical body, and the polishing was repeated while repeating the reciprocating movement while keeping the polishing pressure constant. By this, a cylindrical body polishing method of polishing the cylindrical body so as to have a uniform diameter value until there is no polishing margin portion larger than the minimum diameter value before polishing, wherein the polishing margin portion larger than the minimum diameter value before polishing. The section is polished and moved by the number of times proportional to the pre-polishing diameter value.At this time, the section where the polishing allowance portion having the same diameter value is continuously present is reciprocally polished. Release the close contact between the whetstone and cylinder The polishing method of the cylindrical body, characterized in that to move in the substantially zero polishing pressure is not.