JP4140841B2 - Rubber roller polishing apparatus and rubber roller polishing method using the polishing apparatus - Google Patents

Description

  The present invention relates to a rubber roller polishing apparatus and a rubber roller polishing method using the polishing apparatus, and more specifically, a rubber roller having a predetermined outer diameter used for OA equipment or the like by polishing an outer peripheral surface of a roller-shaped molded body. Is.

  Various OA devices such as laser printers, electrostatic copying machines, plain paper facsimiles, ATMs, and the like use various rubber rollers for feeding, transferring, driving, fixing, and discharging. These various rubber rollers are usually manufactured from rubber materials such as EPDM, NBR, natural rubber, urethane rubber, chloroprene rubber, epichlorohydrin rubber and the like.

  When extruding this type of rubber roller, the rubber raw material is extruded into a tube shape by an extruder and then vulcanized, then a molded body is formed, the shaft is press-fitted into the hollow portion, and the outer peripheral surface is polished. ing.

  As an apparatus for polishing an outer peripheral surface of the molded body to obtain a rubber roller having a predetermined outer diameter, Japanese Patent Application Laid-Open No. 2001-322055 provides a rubber roller polishing apparatus 1 shown in FIG. In the polishing by the polishing apparatus 1, first, both ends of the core metal 3 of the molded body 2 are pressed and clamped by the spindle center 4 a of the spindle 4 and the core pressing shaft 5 a of the core pressing shaft 5, and the motors 6 and 7 are driven to form. The body 2 is rotated in the direction indicated by the arrow A, and then the motor 8 is driven to rotate the grindstone 9 at a high speed in the direction indicated by the arrow B. The grindstone 9 is moved along the axial direction of the molded body 2 while being brought into contact with the body 2 and in contact with the body 2.

  However, since the grindstone 9 of the polishing apparatus 1 has the same outer diameter from the front end to the rear end of the grindstone 9, when the required amount of the molded body 2 is polished by a single polishing operation, the molded body 2 by the grindstone 9 is changed to the molded body 2. There is a problem that the molded body 2 is recessed due to an increase in pressure. In addition, there is a problem that the abrasive powder becomes thread and the dust collector and the like are clogged.

Further, if the molded body 2 is polished little by little by one polishing operation, the grinding stone 9 must be reciprocated in the axial direction of the molded body 2 a plurality of times in order to polish the required amount of the molded body 2 and the work efficiency is deteriorated. There is.
JP 2001-322055 A

  The present invention has been made in view of the above problems, and it is an object of the present invention to polish a molded body accurately and efficiently to a rubber roller having a predetermined outer diameter without causing dents in the rubber roller.

In order to solve the above-mentioned problems, the present invention is a polishing apparatus that is disposed in a rubber roller manufacturing process and polishes the outer peripheral surface of a roller-shaped molded body to a rubber roller having a predetermined outer diameter,
A support means for supporting the molded body while rotating, a grindstone for polishing the outer peripheral surface of the molded body, and a moving means for moving the grindstone along the axial direction of the molded body,
The front end side of the moving direction to the grinding wheel is the green body-side, a plurality of stepped portions which gradually decreases the diameter toward the front end surface while circumferentially provided at intervals, maximum diameter portion identical diameter to the rear side Make it a flat part,
The number of the stepped portions is 3 to 20 steps, the axial length of each stepped portion is 1.5 mm to 3.0 mm, the height is 0.1 mm to 0.3 mm, and the axis of the flat portion The length in the linear direction is 20 mm or more and 100 mm or less, and the height of the stepped portion on the rear end side of the maximum diameter continuous to the flat portion is 0.1 mm or more and 0.15 mm or less,
When the grinding allowance of the molded body by the front end surface of the grindstone and the stepped portion is (a) mm, and the total height of the stepped portions is (b) mm, a−b = c, c ≦ 0 and .3mm or less, the polishing of the (c) mm and a the rubber roller and the grindstone as is done in the front end face of the grinding wheel is positioned,
Further, the present invention provides a polishing apparatus for a rubber roller, characterized in that the time for rotating the formed body once and the time for traversing the length of each step portion of the grindstone are set to be substantially the same.

  With the above configuration, a plurality of step portions are provided around the grindstone for polishing the roller-shaped molded body, and the outer peripheral surface of the molded body is polished little by little, reducing the pressure applied to the molded body during polishing. Thus, it is possible to prevent the polished rubber roller from being bent and to polish the molded body with high accuracy.

  The height in the radial direction of each stepped portion is 0.1 mm or more and 0.3 mm or less, preferably 0.15 mm or more and 0.3 mm or less. This is because the amount of polishing is too small and it is necessary to provide a very large number of steps to polish the required amount. If it is larger than 0.3 mm, the pressure applied to the molded body at the time of polishing will increase, and the rubber roller will be dented. In addition, the polishing powder generated by polishing becomes a thread and causes clogging of the dust collector.

  The reason why the flat portion has an axial length of 20 to 100 mm, preferably 20 to 50 mm is that if it is shorter than 20 mm, a tool mark that is a spiral streak entering the circumferential direction on the outer peripheral surface of the rubber roller remains, This is because if the length is longer than 100 mm, the length of the grinding wheel in the axial direction becomes long, the polishing apparatus becomes larger, and the efficiency of the polishing operation becomes worse.

  When the grinding allowance for polishing the molded body by the front end face and the step portion of the grindstone is (a) mm, and the total height in the same radial direction of the step portion of the grindstone is (b) mm, a−b = The molded body and the grindstone are positioned so that the value of c is 0.3 mm or less, preferably 0.15 mm or less. This is because if the value of c is larger than 0.3 mm, the amount of contact between the front end face of the grindstone and the end face of the rubber roller becomes large, and the polishing powder generated at the time of polishing becomes thread and causes clogging of the dust collector.

The time for rotating the molded body once and the time for traversing the length of each stepped portion of the grindstone are set to be substantially the same as the time for rotating the molded body once and the stepped portions of the grindstone. If there is a large difference in the time for traversing the length of the grinding wheel, it will be polished to more than a predetermined step of the grindstone, the pressure applied to the molded body will increase, and the chatter that is the line entering the outer peripheral surface of the rubber roller in the axial direction will be Because it occurs.
The rotation speed of the rubber roller is 100 to 600 rpm, more preferably 250 to 450 rpm. If the rotation speed is less than 100 rpm, the rotation speed of the rubber roller is slow, and if the movement speed of the grindstone is also slowed accordingly, the polishing operation takes time. If the rotation speed is more than 600 rpm, the rotation speed of the rubber roller is increased. This is because the moving speed of the grindstone is increased, and chatter that is a line entering the axial direction on the outer peripheral surface of the rubber roller is generated.

It is preferable that the height of the rear end side step portion having the maximum diameter continuous with the flat portion is 0.1 mm or more and 0.15 mm or less, and the outer peripheral surface of the step portion is chamfered to form an arc surface.
With the above configuration, since the outer peripheral edge of the step portion on the most rear end side is chamfered to form an arc surface, no streaks are left on the outer peripheral surface of the rubber roller by the outer peripheral edge of the step portion after polishing.
The height of the step portion on the rear end side with the maximum diameter continuous with the flat portion is set to 0.1 mm or more and 0.15 mm or less. If the height is smaller than 0.1 mm, the polishing amount is not sufficient, and the front step portion is polished. This is because the generated streaks on the outer peripheral surface of the molded body may remain, and if it is larger than 0.15 mm, streaks may occur on the outer peripheral surface of the molded body due to polishing by the rear end side stepped portion.

The number of the step portions is 3 to 20 steps, and the length of each step portion in the axial direction is 1.5 mm to 3.0 mm . Traverse speed in the axial direction of the grinding wheel it is preferred that the less 500 mm / min or more 1500 mm / min.
The reason why the number of the stepped portions is 3 or more and 20 or less is that if the number is less than 3 steps, each stepped portion becomes too high to polish the outer peripheral surface of the molded body by a required amount. This is because each step portion becomes too small and the manufacturing cost of the grindstone increases.
The length of each step portion in the axial direction is 1.5 mm or more and 3.0 mm or less. When the length is less than 1.5 mm, the time for rotating the molded body once and the length of each step portion of the grindstone are set. This is because it is difficult to set the time for traversing substantially the same, and when it is larger than 3.0 mm, the grindstone becomes too long.
The reason why the traverse speed in the axial direction of the grindstone is set to 500 mm / min or more and 1500 mm / min or less is that if it is slower than 500 mm / min, the polishing work takes time and the efficiency is deteriorated. This is because the accuracy of is worsened.

Further, the present invention is a method for polishing a rubber roller using the rubber roller polishing apparatus,
The molded body is supported and rotated by the support means, and the grindstone is rotated and moved along the axial direction of the molded body by the moving means, and the outer peripheral surface of the molded body is polished by the front end surface of the grindstone. After that, a method of polishing a rubber roller is provided in which the steps are sequentially polished at each step.
With the above polishing method, a plurality of step portions are provided around the grindstone for polishing the molded body, and the outer peripheral surface of the molded body is polished little by little, so the pressure applied to the molded body during polishing is reduced. Thus, the rubber roller can be prevented from being bent, and the molded body can be accurately polished to obtain a rubber roller having a required outer diameter.

After roughly grinding the outer peripheral surface of the molded body by the front end surface of the grindstone and each stepped portion, the outer periphery of the molded body is set at the outer peripheral edge of the rear end surface of the flat portion of the grindstone in the direction opposite to the moving direction of the grindstone. The surface is preferably finish-polished so as to have a polishing allowance of 0.3 mm or less .
With the above configuration, the streaks on the outer peripheral surface of the rubber roller generated by the polishing by the stepped portion can be reliably erased by the finish polishing, and the polishing can be performed with higher accuracy.

  As is clear from the above description, according to the present invention, a plurality of step portions are provided around the grindstone for polishing the molded body, and the outer peripheral surface of the molded body is polished little by little. Therefore, the rubber roller can be prevented from bending, and the molded body can be polished with high accuracy to obtain a rubber roller having a required outer diameter.

Embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention, FIG. 1 shows a polishing apparatus 10 for a rubber roller, and FIG. 2 shows a grindstone 11 used in the polishing apparatus 10 for the rubber roller.

  The grindstone 11 has a substantially cylindrical shape, and the diameter of the stepped portion 12 on the outer peripheral surface on the front end side thereof is reduced toward the front end side. A portion 13 is provided. Among the 11 steps 12, the six steps 12A on the front end side have a radial height H1 of 0.3 mm, while the five steps 12B on the rear end have a radial height H2. It is 0.15 mm. Further, an axial interval L1 between the front end surface 16 of the grindstone 11 and the step portion 12A-1 on the most front end side and an axial interval L2 between adjacent step portions 12 are set to 2.4 mm.

  The rear end side of the grindstone 11 is a flat portion 14 continuous to the reduced diameter portion 13, and the same diameter is provided from the boundary position between the reduced diameter portion 13 and the flat portion 14 to the rear end of the grindstone 11. The boundary position between the reduced diameter portion 13 and the flat portion 14, that is, the outer peripheral surface 12B-2 of the step portion 12B-1 on the most rear end side is chamfered to form an arc surface of R = 45 mm. The axial length L2 of the flat portion 14 is 23.6 mm, and the overall length of the grindstone 11 is 50 mm. A support shaft 15 supported by the grindstone bearing 40 of the polishing apparatus 10 is projected from the center of the rear end surface 17 of the grindstone 11. The support shaft 15 is coaxial with the reduced diameter portion 13 and the flat portion 14.

  As shown in FIG. 1, the rubber roller polishing apparatus 10 provided with the grindstone 11 includes a first bearing 20 and a second bearing 30 that are rotatable on the same axis, and the first bearing 20 is formed of a molded body 50. The second bearing 30 includes a holding portion 31 that holds the other end 51 b of the shaft 51 of the molded body 50, while the holding portion 21 that holds the one end 51 a of the shaft 51 is provided. The holding portions 21 and 31 as support members are fixed to the distal ends of the first bearing 20 and the second bearing 30, respectively, and rotate with the rotation of the first bearing 20.

  The first bearing 20 is driven and rotated by a motor 25 via pulleys 22 and 23 and a belt 24. Further, the second bearing 30 is disposed to face the first bearing 20 and can be moved back and forth in the axial direction of the shaft 51 of the molded body 50.

  In a direction orthogonal to the axial direction of the molded body 50, the grindstone 11 fixed to the grindstone bearing 40 is disposed to face the molded body 50. The grindstone bearing 40 is driven and rotated by a motor 44 via pulleys 41 and 42 and a belt 43, whereby the grindstone 11 rotates at high speed. The grindstone bearing 40 and the motor 44 are fixed on a grindstone table 45 that is movable in a direction orthogonal to the axial direction of the molded body 50 and parallel to the axial direction of the molded body 50.

  In a state where the motor 44 is driven and the grindstone 11 is rotated at a high speed, the grindstone base 45 is brought close to the molded body 50 to press the grindstone 11 against the molded body 50, and further the grindstone 11 is pressed against the molded body 50. By moving 45 in the axial direction of the molded body 50, the outer peripheral surface of the molded body 50 can be polished.

  The molded body (transfer roller) 50 to be polished by the polishing apparatus 10 is kneaded with a rubber material such as EPDM, NBR, natural rubber, urethane rubber, chloroprene rubber, epichlorohydrin rubber, and the like by a conventional method. The rubber raw material is extruded into a tube shape by an extruder, and then vulcanized, and the shaft 51 is press-fitted into the hollow portion. In this embodiment, the rubber material is an epichlorohydrin foam, and its outer diameter is 17.7 mm in an unpolished state.

Next, a method for polishing the molded body 50 by the polishing apparatus 10 will be described.
First, the molded body 50 is coaxially disposed between the first bearing 20 and the second bearing 30, and the second bearing 30 is advanced toward the first bearing 20, whereby both end portions of the shaft 51 of the molded body 50 are provided. 51a and 51b are press-clamped by the holding parts 21 and 31 in the axial direction. Next, the motor 25 is driven to rotate the holding portion 21, thereby rotating the molded body 50 around the shaft 51 as the central axis. In the present embodiment, the molded body 50 is rotated at 422 rpm in the A direction so that the molded body 50 rotates once in 0.14 seconds.

  Next, the motor 44 is driven to rotate the grindstone 11 at a high speed in the direction indicated by the arrow B, and in this state, the grindstone base 45 is moved in a direction approaching the compact 50, and as shown in FIG. 11 front end surfaces 16 are brought into contact with one end surface of the molded body 50. As shown in FIG. 3B, the front end surface 16 of the grindstone 11 and the end surface of the molded body 50 are in contact with each other by a length H3 in the radial direction. 15 mm. Subsequently, the grindstone 11 is moved along the molded body 50, and as shown in FIG. 4, each stepped portion 12 is brought into contact with one end surface of the molded body 50 to roughly polish the outer peripheral surface of the molded body 50. . In this embodiment, the grindstone 11 is moved at 1000 mm / min, and is moved about 2.4 mm in 0.14 seconds. That is, the grindstone 11 is moved by the interval of the stepped portion while the formed body 50 makes one rotation.

  The grindstone platform 45 is moved along the axial direction of the compact 50 until reaching the other end of the compact 50, and the rear end surface 17 of the grindstone 11 is moved to the other end of the compact 50 as shown in FIG. After passing the end portion, the grindstone 11 is moved closer to the radial direction of the molded body 50 by 0.15 mm and moved in the return direction opposite to the moving direction. As a result, as shown in FIG. 5B, the rear end surface 17 of the grindstone 11 contacts the other end surface of the molded body 50 by H4 = 0.15 mm, and finish polishing is performed over the entire length of the molded body 50.

  As described above, the outer peripheral surface of the compact 50 is 0.15 mm in the radial direction by the front end surface 16 of the grindstone 11, 0.3 × 6 + 0.15 × 5 = 2.55 mm by the stepped portion 12, and the rear end surface of the grindstone 11. The molded body 50 having an outer diameter of 17.7 mm is used as a polished rubber roller having an outer diameter of 12.0 mm.

  With the above configuration, a plurality of step portions are provided around the grindstone 11, and the outer peripheral surface of the molded body 50 is polished little by little. Therefore, the pressure applied to the molded body 50 during polishing is reduced, and the molded body is reduced. 50 bending can be prevented, and the molded body 50 can be polished with high accuracy.

  Of the reduced diameter portion 13 provided with the stepped portion 12, the height in the radial direction of the stepped portion 12A on the front end side is increased to 0.3 mm, and the height in the radial direction of the stepped portion 12B on the rear end side is set to 0. Since the size is as small as .15 mm, the molded body 50 is efficiently polished by the large stepped portion 12A at the beginning, and can be polished accurately by the small stepped portion 12B in the second half.

  Further, since the flat portion 14 is elongated to 23.6 mm in the axial direction, tool marks that are spiral streaks entering the outer peripheral surface of the molded body 50 in the circumferential direction are prevented by finish polishing by the flat portion 14. Can do.

Furthermore, since the time required for one rotation of the molded body 50 is 0.14 seconds, it is possible to prevent chatter that is a line entering the axial direction on the outer peripheral surface of the rubber roller.
In this embodiment, the front end surface of the grindstone 11 and all the stepped portions 12 are abutted against the molded body 50 and polished. However, the molded body may be polished only at the stepped portions 12, and the amount of polishing is small. When the amount is small, the molded body may be polished only at some of the stepped portions 12.

Next, the polishing apparatus of Example 1 and Comparative Examples 1 to 5 and the rubber roller polishing method using the polishing apparatus will be described. In Example 1 and Comparative Examples 1 to 5, the shape of the grindstone for polishing the rubber roller was changed.
Table 1 below shows the shape of the grindstone used in the polishing apparatus of Example 1 and Comparative Examples 1 to 5 and the presence or absence of dents, chatter, tool marks, and thread-like polishing powder of the rubber roller polished by the polishing apparatus.

(Example 1)
The rubber roller was polished by the same method using the same polishing apparatus as in the above embodiment.

(Comparative Example 1)
18 steps were provided on the grindstone, and the height in the radial direction of the steps was all 0.15 mm. The axial length between the step portions was 2.4 mm as in the above embodiment, and the axial length of the flat portion was 6.8 mm. The molded body polished by the grindstone has an outer diameter of 18.0 mm in an unpolished state, the molded body is polished by 3.0 mm in the radial direction with the grindstone, and the outer diameter of the polished rubber roller is 12.0 mm. .
Other configurations were the same as those in Example 1.

(Comparative Example 2)
Five steps were provided on the grindstone, and the height in the radial direction of the step was set to 0.5 mm on the front end side, 0.4 mm on the subsequent stage, and 0.1 mm on the rear stage side. The axial length between the step portions was 2.0 mm, and the axial length of the flat portion was 40.0 mm. The molded body polished by the grindstone is 17.3 mm in outer diameter in an unpolished state, and 2.65 mm in the radial direction is polished by the grindstone, and the outer diameter of the polished rubber roller is 12.0 mm. . That is, the front end face of the grindstone was polished 0.5 mm in the radial direction of the compact. The number of rotations of the compact during polishing was 650 rpm.
Other configurations were the same as those in Example 1.

(Comparative Example 3)
The shape of the grindstone was the same as in Comparative Example 2, and the number of rotations of the molded body during polishing was set to 422 rpm, and only the number of rotations of the molded body was different from that in Comparative Example 2.
Other configurations were the same as those in Example 1.

(Comparative Example 4)
The shape of the grindstone was the same as in Comparative Example 2, and the number of rotations of the molded body during polishing was 276 rpm, and only the number of rotations of the molded body was different from that in Comparative Example 2.
Other configurations were the same as those in Example 1.

(Comparative Example 5)
The shape of the grindstone was the same as in Example 1. The molded body polished by the grindstone is 18.3 mm in outer diameter in an unpolished state, 3.15 mm in the radial direction is polished by the grindstone, and the outer diameter of the polished rubber roller is 12.0 mm. . That is, 0.45 mm was polished in the radial direction of the molded body by the front end face of the grindstone.
Other configurations were the same as those in Example 1.

The presence or absence of dents, chatter, tool marks, and thread-like polishing powder of the rubber roller polished by the polishing apparatus of Example 1 and Comparative Examples 1 to 5 were observed.
The case where there was no dent of the rubber roller was evaluated as ◎, the case where there was a slight dent but there was no problem in the performance of the rubber roller was evaluated as ◯, and the case where the dent was formed and became defective was evaluated as ×.
The case where chatter and tool marks did not occur on the outer peripheral surface of the rubber roller was evaluated as ○, and the case where it occurred was evaluated as ×.
The case where no thread-like polishing powder was generated was evaluated as ◯, and the case where it was generated was evaluated as ×.
The evaluation results based on the observation are shown in Table 1 above.

The rubber roller polished by the polishing apparatus of Example 1 had no dents, chatter and tool marks, and could be polished with high accuracy. Further, there was no generation of thread-like polishing powder.
In Comparative Example 1, since the length of the flat portion of the grindstone was short, the finish polishing was not sufficient and a tool mark was generated.
In Comparative Examples 2 to 4, since the polishing by the front end face and the step portion of the grindstone was as large as 0.4 to 0.5 mm in the radial direction of the molded body, the rubber roller was recessed and thread-like polishing powder was generated.
Further, in Comparative Example 2, the number of rotations of the molded body is high, and the time taken for the molded body to make one rotation coincides with the time taken for the grindstone to move between one stepped portion, that is, 2.0 mm. The chatter occurred on the outer peripheral surface of the rubber roller.
In Comparative Example 5, the shape of the grindstone was the same as that of Example 1, but since the front end surface of the grindstone was polished 0.45 mm in the radial direction of the molded body, thread-like polishing powder was generated.

It is drawing which shows the grinding | polishing apparatus of the rubber roller of embodiment of this invention. The grindstone used for a polisher is shown, (A) is a front view and (B) is an important section expanded sectional view. (A) (B) is drawing which shows the state which the front-end surface of a grindstone and one end surface of a molded object contact | abut. It is drawing which shows the state which grind | polishes the molded object with a grindstone. (A) is a figure which shows the state which grind | polished the molded object, (B) is a figure which shows the state which the rear-end surface of a grindstone and the other end surface of a molded object contact | abut. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rubber roller polishing apparatus 11 Grinding stone 12 Stepped portion 12A Front end stepped portion 12B Rear end side stepped portion 13 Reduced diameter portion 14 Flat portion 15 Support shaft 16 Front end surface 17 Rear end surface 20 First bearings 21, 31 Holding portion 22, 23, 41, 42 Pulley 24, 43 Belt 25, 44 Motor 30 Second bearing 40 Grinding wheel bearing 45 Grinding wheel base 50 Molded body 51 Shaft

Claims (5)

A polishing apparatus that is disposed in a rubber roller manufacturing process and polishes the outer peripheral surface of a roller-shaped molded body to a rubber roller having a predetermined outer diameter,
A supporting means for supporting the molded body while rotating, a grindstone for polishing the outer peripheral surface of the molded body, and a moving means for moving the grindstone along the axial direction of the molded body,
The front end side of the moving direction to the grinding wheel is the green body-side, a plurality of stepped portions which gradually decreases the diameter toward the front end surface while circumferentially provided at intervals, maximum diameter portion identical diameter to the rear side Make it a flat part,
The number of the stepped portions is 3 to 20 steps, the axial length of each stepped portion is 1.5 mm to 3.0 mm, the height is 0.1 mm to 0.3 mm, and the axis of the flat portion The length in the linear direction is 20 mm or more and 100 mm or less, and the height of the stepped portion on the rear end side of the maximum diameter continuous to the flat portion is 0.1 mm or more and 0.15 mm or less.
When the grinding allowance of the molded body by the front end surface of the grindstone and the stepped portion is (a) mm, and the total height of the stepped portions is (b) mm, a−b = c, c ≦ 0 and .3mm or less, the polishing of the (c) mm and a the rubber roller and the grindstone as is done in the front end face of the grinding wheel is positioned,
The rubber roller polishing apparatus is characterized in that the time for rotating the formed body once and the time for traversing the length of each stepped portion of the grindstone are set substantially the same. The rubber roller polishing apparatus according to claim 1, wherein the outer peripheral surface of the step portion on the rear end side of the maximum diameter continuous to the flat portion is chamfered to form an arc surface. On SL rubber roller of the polishing apparatus according to traverse speed to claim 1 or claim 2 is set to 500 mm / min or more 1500 mm / min or less in the axial direction of the grinding wheel. A method of polishing a rubber roller using the rubber roller polishing apparatus according to any one of claims 1 to 3,
The molded body is supported and rotated by the support means, and the grindstone is rotated and moved along the axial direction of the molded body by the moving means, and the outer peripheral surface of the molded body is polished by the front end surface of the grindstone. After that, a method of polishing the rubber roller, in which the steps are sequentially polished at each step. After roughly grinding the outer peripheral surface of the molded body by the front end surface of the grindstone and each stepped portion, the outer periphery of the molded body is set at the outer peripheral edge of the rear end surface of the flat portion of the grindstone in the direction opposite to the moving direction of the grindstone. The method for polishing a rubber roller according to claim 4, wherein the surface is finish-polished so as to have a polishing allowance of 0.3 mm or less .

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