Abstract
The special processing method for the outer diameter of thrust type large taper angle small taper rollers belongs to the field of bearing roller manufacturing technology. The present invention designs four different angle spiral wheel drawings for each specification. The angle is twice that of the finished roller, and four different angle spiral wheels are used for multiple passes of penetrating grinding the outer diameter of the roller. After adopting the processing method of gradually increasing the penetrating guide wheel angle to the finished angle, the grinding amount is gradually ground from the small end of the roller to the large end; Firstly, rough grinding of the outer diameter is carried out by reducing the angle of the spiral wheel to remove most of the grinding amount from the small end of the roller. Then, in the fine and fine grinding of the outer diameter process, a spiral wheel with an angle of 12 ° -13 ° and the finished roller is used to remove the remaining very little grinding amount in the full length direction of the outer diameter of the roller. The beneficial effect achieved by the present invention is to uniformly grind the outer diameter of the roller, solving the problem of machining thrust type large taper angle small taper rollers. Suitable for processing thrust type tapered rollers with short, coarse, and large half taper angles.
Description
Special machining method for outer diameter of thrust type large taper angle and small taper roller
technical field
The present invention belongs to the field of bearing roller manufacturing technology.
Background technology
When processing small tapered rollers, the angle of the stamping die is taken as the half taper angle of the tapered roller. In the rough grinding outer diameter process, the same angle (usually the half taper angle of the finished roller) of the spiral guide wheel is used for two passes of through grinding. In the fine grinding outer diameter process, the same angle of spiral wheel through grinding is also used, that is, multiple machine tools are used for rough, fine, fine, and final grinding outer diameter processes.
The process steps are as follows: stamping and pressing, string ring belt, heat treatment, rough grinding of outer diameter, grinding of double end faces, fine grinding of outer diameter, grinding of ball base surface, fine grinding of outer diameter, and final grinding of outer diameter.
For various types of thrust type large taper angle and small taper rollers such as 917/42.1PZSV, 917/45.1PZSV, 917/38.4PZSV, 917/48PZSVX3, the finished diameter size is generally around 7mm, the length is about 9mm, and the half taper angle is 7 ° 07 ′. However, for 91210X3PZSV thrust type large taper angle and short, coarse shaped small taper rollers, the finished size is generally around 10.87mm The L is 8.83mm and the half angle is 8 ° 50 ′. It can be seen that the angle is 1 ° 50 ′ larger than the roller angle mentioned above, which is extremely difficult to process. The characteristic of this type of tapered roller is its short, coarse shape, and large half taper angle. The roller is prone to "transverse" damage to the grinding wheel when passing through the wheel groove, making it difficult to grind the outer diameter and resulting in low production efficiency. Whether it is stamping or through grinding, the difficulty is extremely high. Causing stamping processing to become stuck, with poor alignment, chamfering, ring deviation, and an increase in the number of grinding passes, increasing the probability of roller wear.
summary of the invention
The purpose of the present invention is to provide a special processing method for uniformly grinding the outer diameter of a thrust type large taper angle small taper roller with minimal roller wear.
The technical solution of the present invention is a method for processing the outer diameter of a thrust type large taper angle small taper roller, which comprises the following steps: stamping and pressing, series ring belt, heat treatment, rough grinding of outer diameter, grinding of double end faces, fine grinding of outer diameter, non-magnetic grinding of ball base surface, fine grinding of outer diameter, and final grinding of outer diameter, wherein:
Set the angle of the stamping die to 3 ° -4 °, and leave a tolerance of 0.5-0.7mm for the outer diameter of the large end of the small tapered roller and 1.0-1.2mm for the outer diameter of the small end after stamping; Using the same machine tool to perform multiple through grinding of all coarse, fine, fine, and final outer diameter processes by changing the angle of the spiral wheel;
b. Coarse grinding outer diameter process, grinding 3-4 times, 1-3 times using 9 ° -10 ° spiral guide wheels for grinding, and the 4th time using 10-12 ° spiral guide wheels for grinding rollers;
c. Fine grinding outer diameter process, grinding 2-3 times, using 12-13 ° spiral guide wheels to penetrate and grind the rollers;
d. The precision grinding process uses a 14 ° -15 ° spiral wheel to penetrate and grind the rollers 1-3 times.
The processing method for the outer diameter of a thrust type large taper angle small taper roller as described above, wherein:
a. Set the angle of the stamping die to 3 ° 30 ′, and leave a tolerance of 0.60mm for the outer diameter of the large end of the small tapered roller and 1.1mm for the outer diameter of the small end after stamping; Using the same machine tool to perform multiple through grinding of all coarse, fine, fine, and final outer diameter processes by changing the angle of the spiral wheel;
b. Coarse grinding outer diameter process, grinding 4 times, 1-3 times using 9 ° -10 ° spiral guide wheel for grinding, and the 4th time using 11 ° spiral guide wheel for grinding rollers;
c. Fine grinding outer diameter process, grinding 3 times, using a 13 ° spiral guide wheel to penetrate and grind the rollers;
d. The precision grinding process uses a 14 ° 14 'spiral wheel to penetrate and grind the rollers twice.
Four different angle spiral wheel drawings were designed for each specification, using an angle twice that of the finished roller. Four different angle spiral wheels were used for multiple passes of through grinding the outer diameter of the roller. After gradually increasing the through guide wheel angle to the finished angle, the grinding amount gradually increased from the small end of the roller to the large end; Firstly, rough grinding of the outer diameter is carried out by reducing the angle of the spiral wheel to remove most of the grinding amount on the small end of the roller. Then, in the fine and fine grinding of the outer diameter process, the remaining grinding amount in the full length direction of the outer diameter of the roller is removed by grinding the spiral wheel at an angle of 12-13 ° and the finished roller.
The beneficial effect achieved by the present invention is to uniformly grind the outer diameter of the roller, solving the problem of machining thrust type large taper angle small taper rollers.
Specific implementation methods
The following will further explain the present invention in conjunction with specific implementation methods.
Taking the thrust type large taper angle small taper roller 917/42.1PZSV as an example, due to the much smaller mold angle during stamping compared to the finished roller angle, the stamping mold angle is set to 3 ° 30 ′. After stamping, the large end outer diameter of the small taper roller is left with a tolerance of 0.60mm, and the small end outer diameter is left with a tolerance of 1.1mm. This results in a larger tolerance for the small end outer diameter of the roller, but a different tolerance for the full length of the outer diameter of the roller. Four types of spiral wheels with 9 ° -10 °, 11 °, 13 °, and 14 ° 14 ′ angles are used for multiple passes through grinding of the outer diameter of the roller. In the rough grinding outer diameter process, grind 3-4 times, use a 9 ° -10 ° spiral guide wheel for grinding 1-3 times, and use a spiral guide wheel of about 11 ° for grinding the rollers for the 4th time; The fine grinding outer diameter process involves grinding the rollers three times using a 13 ° spiral guide wheel, and the fine grinding process involves grinding the rollers two times using a 14 ° 14 'spiral wheel, which takes the spiral wheel at the angle of the finished roller for grinding to remove the remaining minimal grinding amount. The rest of the process enters conventional grinding, using a grinding method where the spiral wheel angle gradually increases to the angle of the finished roller. This gradually extends from the outer diameter of the small end of the roller to the outer diameter of the large end, achieving a uniform grinding effect of the outer diameter of the rollers. The same machine tool is used to change the spiral wheel at different angles for multiple through grinding of all coarse, fine, fine, and final outer diameter processes. At the same time, rubber 80 # grinding wheel is used, and the grinding wheel is frequently trimmed. After taking the above measures, So that the rollers basically meet the process requirements, Solved the production and processing difficulties of thrust type large taper angle small taper rollers.
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Interroll Tapered Roller:
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