JPH11114800A - Method for specular-polishing cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for specular-polishing a cylindrical body by a grinding wheel, capable of performing quick and high-precise specular polishing by grinding of the grinding wheel not by buffing. SOLUTION: In a method for specular-polishing a cylindrical body W, both ends of the cylindrical body W are chucked and rotated, the cylindrical body W is pressed by the grinding wheel end surface of a PVA grinding wheel 27b capable of being freely rotated, lubricating liquid is supplied to the pressing part, the PVA grinding wheel 27b is rotated with the rotation of the cylindrical body W, the PVA grinding wheel 27b is moved, and therefore, the minute relative speed is generated on the linear contact parts of the cylindrical body W and the PVA grinding wheel 27b, and the cylindrical body W is specular- polished.

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 mirror-polishing a cylindrical body using a polishing grindstone, which can achieve extremely high cylindrical polishing precision in a short time and can perform quick and high-precision mirror-polishing by grindstone polishing without buffing.

[0002]

2. Description of the Related Art Conventionally, printing is not performed if the diameter of the middle of the plate making roll is larger or smaller than the diameter of both ends, so that the plate making roll requires extremely high cylindrical accuracy.
Further, the rolling roll is required to have higher cylindrical accuracy. 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. . Further, both the plate making roll and the rolling roll need to be mirror-polished. Conventionally, 200
Even if the cylindrical body was polished with a fine grinding wheel made of silicon carbide of the 0th to 3000th ranks, it was impossible to perform mirror polishing. Conventionally, it has been known that pressing a movable and non-rotatable smooth polishing grindstone against a rotating cylinder results in a mirror surface, but this is because the eyes of the polishing grindstone are immediately buried. The surface was not polished, but rubbed with a grindstone with buried eyes to give a gloss, and uniform mirror polishing was impossible. Conventionally,
The mirror polishing of the cylindrical body has been performed exclusively by buffing. More specifically, the cylindrical surface is polished with a coarse grinding wheel made of silicon carbide at the 800th rank, and then the cylindrical surface is finely polished with the fine grinding wheel made of silicon carbide at the 2000th to 3000th ranks, and then the mirror surface is polished by buffing. Had been polished.

[0003]

As described above, when the cylindrical accuracy of the cylindrical body before the cylindrical polishing is low, even if the conventional cylindrical polishing with the correction is performed, the cylindrical accuracy does not always become high. 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 the cylindrical polishing is repeated, the diameter of the cylindrical body may be too small.
If the cylindrical body is mirror-polished by buffing, there is a problem in eliminating dust and noise, and the time required for mirror-polishing is long, and skill is required.

[0004] The present invention has been made in view of the above-mentioned point. Even if the cylindrical precision of the cylindrical body before the cylindrical polishing is low, or if a cylindrical polishing apparatus having a low cylindrical polishing precision is used, the cylindrical body can be formed. An extremely high cylindrical polishing accuracy can be obtained in a short time so that a uniform diameter can be obtained over the entire length. It is intended to provide.

[0005]

According to the present invention, a cylindrical body is chucked at both ends and rotated, and the cylindrical body is freely rotatable.
The PVA grindstone is rotated by rotating the cylindrical body while pressing the VA grindstone at the grindstone end face and applying a lubricating liquid to the pressed portion, and PVA is applied.
It is an object of the present invention to provide a method for mirror-polishing a cylindrical body, wherein the cylindrical body is mirror-polished by moving a grindstone to generate a minute relative velocity at a line contact point between the cylindrical body and a PVA grindstone. Further, the present invention, the cylindrical body is chucked at both ends and rotated, the cylindrical body is pressed with a freely rotatable PVA grindstone and moved while applying a lubricating liquid to perform finish polishing,
Next, the cylindrical body is rotated at a rotational speed larger than the rotational speed at the time of finish polishing, and the PVA grindstone is disconnected from the cylindrical body with a driving source at the time of the polishing so that the cylindrical body is freely rotatable. By pressing at a constant pressure and applying lubricating liquid to the pressed point and moving the PVA grinding wheel to rotate the cylinder,
An object of the present invention is to provide a method for mirror-polishing a cylindrical body, wherein a small relative velocity is generated at a line contact point between the cylindrical body and a PVA grindstone to mirror-polish the cylindrical body. Further, the invention of the present application, the cylindrical body is chucked at both ends and rotated, pressed while pressing the end face of the coarse grinding wheel that is rotationally driven to the cylindrical body and applying a lubricating liquid, and polished so that the entire length becomes a uniform diameter, Next, the cylindrical body is rotated in the reverse direction to remove pitch streaks attached to the cylindrical body by the coarse polishing grindstone, and then moved while pressing the cylindrical body with a rotationally driven PVA grindstone and applying a lubricating liquid. Finish polishing is performed, and then the cylindrical body is rotated at a rotation speed higher than the rotation speed at the time of the finish polishing, and the PVA grindstone which is freely rotatable is pressed at a constant pressure several times the polishing pressure and lubricating liquid is applied. Moving the PVA grindstone to the rotation of the cylindrical body so as to generate a minute relative velocity at a line contact point between the cylindrical body and the PVA grindstone to mirror-polish the cylindrical body. To provide.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a cylindrical polishing apparatus for carrying out a mirror polishing method for a cylindrical body according to the present invention will be briefly described with reference to FIGS. This cylindrical polishing apparatus is a two-head type polishing apparatus. 1 and 2, a cylindrical body W is 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). . Reference numeral 22 denotes an X table.
It is movable in the direction (parallel to the cylindrical surface of the cylindrical body W). Reference numerals 23a and 23b denote XY tables which are mounted on the X table 22 and are movable together with the X table 22 in the X direction, and are Y-movable by Y direction moving devices 24a and 24b attached to the X table 22. In the direction (perpendicular to the cylinder axis of the cylinder W). Symbol 25
Reference numerals a and 25b denote movable brackets, which are XY tables 22.
Cylinder devices 26a, 26a, 26b, 2 provided in
6b and is movable in the Y direction. Reference numeral 27a denotes a polishing wheel made of silicon carbide having a coarseness of 800, and the shaft 28a is connected to the XY table 23a.
Are rotated by a motor 30a provided on the XY table 23 at a high speed.
No. 000 PVA polishing grindstone (commonly called a sponge grindstone, which is obtained by adding PVA (polyvinyl alcohol) and phenol as an adhesive to silicon carbide and sintering), and a shaft 28b is provided on an XY table 23b. XY table 23 pivoted by a mounted bearing 29b
b is rotated at a high speed by a motor 30b provided at the position b. Reference numeral 31 denotes a high-pressure air generating blower which is mounted on the X table 22 and supplies high-pressure air to the cylinder devices 26a, 26a, 26b, 26b. Controllers not shown are cylinder devices 26a, 26
By inputting a signal from a pressure sensor (not shown) attached to a, 26b, 26b, the cylinder pressure is freely adjusted so that the polishing pressure for pressing the polishing grindstone 27 against the cylindrical body W matches the polishing data instructed by the controller. Can be adjusted. Therefore, when the cylindrical grinding device rotates the cylindrical body W after the grinding wheel 27a or 27b approaches the cylindrical body W to extend the cylinder device 26a, 26a or 26b, 26b, the grinding wheel 27a or 27b is moved to the cylindrical body. It can be polished at a constant pressure in close contact with W.
By moving 2, cylinder polishing can be performed.

Next, a method for mirror-polishing a cylindrical body according to an embodiment of the present invention will be described. As shown in FIG. 1, the mirror polishing method of the cylindrical body is performed by chucking and rotating the cylindrical body W at both ends and rotating the cylindrical body W by rotating the end face of an 800-inch silicon carbide polishing grindstone 27a. 2 (a) and 2 (b) while pressing and applying a lubricating liquid to polish so that the entire length becomes a uniform diameter. Then, the cylindrical body W is rotated in the reverse direction to rotate the cylindrical body W by the polishing grindstone 27a. Polishing is performed to remove the pitch stripes attached to the body W, and then, as shown in FIG.
For example, from No. 2000 to 600 driven to rotate by the cylindrical body W
Pressing with a No. 0 PVA grindstone 27b and moving while applying a lubricating liquid to perform finish polishing, and then rotating the cylindrical body W at a rotation speed two to three times larger than the rotation speed at the time of the finish polishing, and turning the motor 30b on PV that can be freely rotated by stopping the drive
By pressing the A grindstone 27b at a constant pressure of 2 to 3 times the polishing pressure, the PVA grindstone 27b is rotated along with the rotation of the cylindrical body W, and as shown in FIG.
A speed distribution proportional to the radius of rotation is obtained in the A grinding wheel 27b, and as a result, as shown in FIG.
At the line contact point of the grinding wheel 27b, a minute relative speed with respect to the cylindrical body W is obtained, so that the cylindrical body W and the PVA grinding wheel 2 are obtained.
The cylindrical body W is mirror-polished by moving the PVA grindstone 27b while applying the lubricating liquid to the contact portion of the cylindrical body W.

Next, a description will be given of a moving order for polishing so that the entire length of the cylindrical body has a uniform diameter with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows a state where a cylindrical body W which is chucked and rotated by the chuck cone 21a and the chuck cone 21b and is rotated is polished with a polishing grindstone 27a. Fig. 7 shows the diameter value before polishing obtained by correcting the measured diameter value in each section. FIG. 2A measures the diameter at a position 10 mm away from one end of the cylindrical body W,
Next, the diameter is measured at a pitch of 30 mm, and a position 10 mm away from the last measurement point to the other end of the cylindrical body W is shown.
The diameter was measured to the third decimal place and rounded to the third decimal place. The polishing grindstone 27a is adjusted in such a manner that the polishing pressure is adjusted so that a single polishing dimension when moving in one direction while keeping the polishing pressure constant and in close contact with the cylindrical body W is 2.5 microns so that polishing can be performed. And the grinding wheel 27a
Is polished once, the cylindrical body W is polished so that the diameter is reduced 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. 2 (b)
Describes the movement of the grinding wheel by indicating the pre-polishing diameter value of each section of the cylindrical body 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. 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. Hereinafter, it will be conceptually described that the diameter is finally uniform through the description of the order of removing the blocks. 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. And the grinding wheel 2
7a 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 is 2.5 μm, and reciprocation is performed in the order shown by the reference numerals 1 to 18 attached to the arrows in FIG. By removing the blocks that have been polished one round trip by repeating the movement and polishing, the entire length of the cylindrical body can be polished to a uniform diameter smaller by one round trip than the minimum diameter value before polishing. The order of the reciprocating movements indicated by 1 to 18 in FIG. 2B follows the following rules. The block corresponding to the polishing margin portion larger than the minimum diameter value before polishing is shown in FIG.
1, 2, 4, 6, 8, 10, 1 attached to the arrow in the middle
The reciprocating polishing is removed in the order of 2, 14, and 16 in the order of completion. 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. FIG.
For example, when a continuous section is reciprocally polished so as to remove a block of the same stage conceptually by performing reciprocating polishing of reference numeral 2 in (b), a block of a reciprocating section of reference numeral 4 and a block of a reciprocating section of reference numeral 6 are obtained. break up. Therefore, the grinding wheel is polished in the direction of the reference numeral 3 of the block of the arrow section of the reference numeral 3 to perform reciprocating polishing of the reference numeral 4 to remove the block of the arrow section of the reference number 4, and then to remove the block of the arrow section of the reference number 5. Code 5
Then, the reciprocating polishing of reference numeral 6 is performed to remove the block in the section indicated by the reference numeral 6 so that the polishing pressure of the polishing wheel is not reduced to zero and the polishing wheel is not separated from the cylindrical body. That is, when at least once the reciprocating polishing is performed and the remaining polishing allowance is separated, the section already polished to the minimum diameter value before polishing is polished and moved from one end of the cylindrical body to the other end. Further, when the reciprocating polishing indicated by reference numeral 16 in FIG. 2B is performed, the polishing is performed until there is no polishing margin larger than the minimum diameter value before polishing. The section polished to the minimum diameter value is polished. Thus, the entire length of the cylindrical body is intermittently polished so as to have a small uniform diameter obtained by polishing once in one direction from the minimum diameter value before polishing. So, finally,
Reference numeral 1 in FIG. 2B from the other end of the cylindrical body toward one end.
8 is performed. As a result, the entire length of the cylindrical body is polished so as to have a uniform diameter smaller than the minimum diameter value before polishing by one round trip. Although actual polishing cannot be performed first from the inside, moving the grindstone as described in the order of removing the blocks described above may reduce the diameter of the cylindrical body, as if in the lower stage. When the block is removed, the upper block drops 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. Precise polishing can be performed so as to have a uniform diameter smaller by one round trip than the minimum diameter value before polishing. The polishing of reference numeral 18 in FIG. 2B is not an essential requirement of the present invention. The reason is,
This is because the diameter becomes uniform when the polishing of reference numeral 17 is completed. Further, if the polishing of the reference numeral 18 is an essential requirement, it is possible to remove the cylindrical body and attach it to another polishing apparatus to perform the polishing of the reference numeral 18 when the polishing of the reference numeral 17 is completed.

FIG. 6 is a view showing another moving order of the grinding wheel. According to this moving order, the polishing start position and the polishing end position are in the middle of the cylindrical body. The relationship between the magnitude of the stroke and the order of polishing is reversed between the reciprocating polishing of reference numerals 1 and 3 and the reciprocal polishing of reference numerals 13 and 19. 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.

[0010]

As described above, according to the method for mirror-polishing a cylindrical body of the first and second aspects of the present invention, 1) the mirror-polished powder does not crush the eyes of the grinding wheel, and the grinding wheel is polished. Thus, mirror polishing of the cylindrical body can be performed. Therefore, for example, after polishing with a grinding wheel of No. 800, for example, polishing with a PVA grinding wheel of No. 3000 to No. 6000, and thereafter, the PVA
Mirror polishing is possible with a whetstone. The present invention is, for example, 3000
A small relative rotation speed is obtained by strongly pressing the PVA grinding wheel from No. 6000 to No. 6000 against the cylindrical body and rotating the same, and this minute relative rotational speed achieves a minute polishing effect with no directivity to the cylindrical body. The mirror surface can be polished by Suekoto.
On the other hand, even if the PVA grindstones of No. 3000 to No. 6000 are driven to rotate and pressed against the rotatably driven cylindrical body, mirror polishing cannot be realized. 2) Mirror polishing of the cylindrical body can be performed by whetstone polishing, so that precise polishing can be performed in a shorter time than buff polishing. 3) Since mirror polishing of the cylindrical body can be performed by grinding stone, automatic polishing can be performed without skill. 4) The buff polishing has a disadvantage that noise and dust are generated and the polishing time is long. However, according to the mirror polishing method for a cylindrical body of the present invention, such a defect is solved. According to the cylindrical body mirror polishing method of the third invention of the present application, the following effects are obtained in addition to the above effects. 5) Even if the cylindrical accuracy of the cylindrical body before the cylindrical polishing is low, the cylindrical body can be precisely polished to a uniform diameter over the entire length by light polishing in a short time. 6) Since the number of times of polishing is proportional to the diameter and the pressure is kept constant, the polishing is performed uniformly along the entire length of the cylindrical body even if the linear motion accuracy of moving the grinding wheel of the polishing apparatus along the cylindrical body is low. A polishing apparatus which can be polished to a diameter and has a low cylindrical polishing accuracy can be improved from a soft surface to a very high cylindrical polishing accuracy. 7) Since the polishing is performed while keeping the pressure constant, there is no need to make corrections for the gradual collapse of the surface of the grinding wheel. 8) Compared with the conventional cylindrical body polishing method, which repeatedly repeats the process of polishing and removing the entire length of the cylindrical body, measuring the location where the diameter is large, chucking the polishing device again, and polishing many times, it is much faster. Precise cylindrical body polishing is possible. 9) Compared with the conventional cylindrical body polishing method that detects the minute size of the reduced grinding wheel during polishing and makes corrections as needed, the cylinder body can be polished with higher precision. 10) The cylindrical body can be polished to a uniform diameter over the entire length simply by moving reciprocatingly and polishing repeatedly without performing cylindrical polishing continuously from one end to the other end of the cylindrical body. One round of cylindrical polishing to the end 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. 11) It is sufficient to measure the cylinder accuracy only once before polishing the cylinder. 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 mirror polishing method of a cylindrical body according to the present invention, and polishes the entire length of a cylindrical body which is a component of the mirror polishing method of a cylindrical body to a uniform diameter. Indicates the status.

FIG. 2 is a view for explaining a moving order for polishing the entire length of the cylindrical body to a uniform diameter as a component of the method for mirror-polishing a cylindrical body according to the first embodiment of the present invention. (A)
Indicates the diameter value before polishing at a 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 schematic front view of a cylindrical polishing apparatus for carrying out the mirror polishing method for a cylindrical body according to the present invention, showing a state where the cylindrical body is mirror-polished.

FIG. 4 is a view for explaining a mirror polishing method for a cylindrical body according to the present invention, and is a view showing a velocity distribution at a line contact point when a grinding wheel is brought into contact with the cylindrical body.

FIG. 5 is a view for explaining the mirror polishing method of the cylindrical body according to the present invention, wherein the speed of the midpoint of the line contact point when the grinding wheel is brought into contact with the cylindrical body is equal to the speed of the cylindrical body. The figure which shows the relative velocity distribution when it considers.

FIG. 6 is a view for explaining a method for polishing a grindstone of a cylindrical body according to a second embodiment of the present invention, in which the diameter value before polishing of each section of the cylindrical body is shown by a bar graph of block stacking and 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 27a: Polishing whetstone 27b: PVA whetstone

Claims (3)

[Claims] 1. A cylindrical body is chucked at both ends and rotated, and the cylindrical body is pressed by a grinding wheel end face of a free rotatable PVA grindstone, and PVA is applied to the rotation of the cylindrical body while applying a lubricating liquid to a pressed portion.
By moving the grindstone and moving the PVA grindstone,
A mirror-polishing method for a cylindrical body, wherein a fine relative velocity is generated at a line contact point between the cylindrical body and a PVA grindstone to mirror-polish the cylindrical body. 2. The cylindrical body is chucked at both ends and rotated, and the cylindrical body is pressed with a freely rotatable PVA grindstone and moved while applying a lubricating liquid to perform finish polishing. The PVA grindstone is rotated at a rotational speed greater than the rotational speed of the cylindrical body by disconnecting the PVA grindstone from a driving source at the time of the polishing so as to be freely rotatable, and is pressed at a constant pressure several times the polishing pressure and pressed. The PVA grindstone is moved to rotate the cylindrical body by applying a lubricating liquid to the cylindrical body, so that the cylindrical body and the PVA are rotated.
A mirror polishing method for a cylindrical body, comprising: mirror-polishing a cylindrical body by generating a minute relative velocity at a line contact point of a grindstone. 3. A cylindrical body is chucked at both ends and rotated, and is pressed while pressing an end surface of a rough polishing grindstone which is rotationally driven on the cylindrical body, and is moved while applying a lubricating liquid to polish the entire length to have a uniform diameter.
Next, the cylindrical body is rotated in the reverse direction to remove pitch streaks attached to the cylindrical body by the coarse polishing grindstone, and then moved while pressing the cylindrical body with a rotationally driven PVA grindstone and applying a lubricating liquid. Finish polishing is performed, and then the cylindrical body is rotated at a rotation speed higher than the rotation speed at the time of the finish polishing, and the PVA grindstone which is freely rotatable is pressed at a constant pressure several times the polishing pressure and lubricating liquid is applied. PVA to rotate cylindrical body
A mirror polishing method for a cylindrical body, characterized in that a mirror body is mirror-polished by moving a grindstone to generate a minute relative velocity at a line contact point between the cylindrical body and a PVA grindstone.