Abstract
A high-precision process for convexity of cylindrical and tapered rollers. Two spiral rolling surfaces are used as guide rollers that cooperate with each other, and the axis of the workpiece tilts to the left or right relative to its forward direction B at an angle α, The upper busbar of the workpiece is parallel to the plane formed by the axis lines of the two guide rollers. Under the support and drive of the guide roller, and under the action of the oil stone group, the outer diameter of the workpiece can obtain a logarithmic curve convex shape, which has the characteristics of simple operation and stable processability. Moreover, the design and manufacturing of the guide roller are simple and suitable for widespread promotion.
Description
The present invention relates to a process for grinding, in particular to a convex ultra precision process for cylindrical rollers, tapered rollers or similar objects.
The existing cylindrical roller convexity ultra precision technology uses ultra precision guide rollers without spiral edges. In order for the processed cylindrical roller to move forward automatically, the two guide wheels must tilt towards each other at a certain angle in the vertical direction. Therefore, the design and manufacturing of this guide roller are quite complex, and some manufacturers have to import it from abroad. The convexity exceeded by this method is either semi convex or fully convex, and cannot achieve the logarithmic curve convexity that can withstand the load the most; The high-precision convexity of tapered rollers is a blank in China.
The purpose of the present invention is to provide a convex ultra precision process for cylindrical rollers, tapered rollers, or similar objects that can obtain their outer diameter in a logarithmic curve shape, and the device used is easy to manufacture and operate, in response to the aforementioned shortcomings.
The technical solution of the present invention is: a cylindrical roller and a conical roller convexity ultra precision process, which adopts a system composed of two mutually matched guide rollers and an oilstone group. The workpiece rotates on one side under the support and drive of the guide rollers, and continuously advances along the direction B specified by the guide rollers. Under the vibration frequency f and pressure P of the oilstone group, the outer diameter of the roller is processed using a centerless through type ultra precision machining method to achieve convexity. The special feature is that the axis lines of the two guide rollers are parallel, and the rolling surface of the spiral groove they open is a cone. One of the guide rollers is equipped with a spiral edge guard. The spiral groove rolling surface of the guide roller matches the outer surface of the workpiece, causing the axis of the workpiece to tilt left or right by an angle relative to its forward direction B α, And make the plane formed by the upper busbar of the workpiece parallel to the axis of the guide roller.
When the workpiece in the technical solution of the present invention is a cylindrical roller, the cone angles of the spiral groove rolling surface cones of the two guide rollers are equal in size and opposite in direction. The described inclination angle α The value of is between 0.5 ° and 2 °.
When the workpiece in the technical solution of the present invention is a tapered roller, the size of the cone angle of the spiral groove rolling surface cone of the two guide rollers is not equal, the direction of the cone angle is opposite, and the tilt angle is α The value is half of the cone angle of the tapered roller plus 0.5 ° to 2 °.
The present invention adopts a slanting ultra precision process, which enables the outer diameters of cylindrical rollers and tapered rollers to obtain a logarithmic curve convex shape, thereby increasing the service life of the product by more than 2-3 times. Due to the spiral edge on one of the guide rollers, the spiral groove rolling surface of the two guide rollers can be designed as a matching conical surface. Therefore, the manufacturing and processing of the guide rollers is easy, the method is simple, the process performance is stable, and it is easy to widely promote and apply. It will play a very important role in creating quality and efficiency for enterprises.
The illustration of the attached figure is as follows:
Figure 1 is a schematic diagram of the outer diameter of the ultra precision cylindrical roller of the present invention, and is attached as an abstract of the instruction manual;
Figure 2 is a right side schematic diagram of Figure 1;
Figure 3 is a top-down schematic diagram of Figure 1;
Figure 4 is a schematic diagram of the outer diameter of the ultra precision tapered roller of the present invention;
Figure 5 shows the basic figure of the logarithmic curve convex shape obtained by the ultra precision of the present invention.
The present invention is further elaborated in conjunction with the accompanying drawings: Figures 1, 2, and 3 are ultra precision illustrations of cylindrical rollers. The device used includes a guide roller 1 with a blocking edge, a guide roller 2 without a blocking edge, and an oilstone group 3. Workpiece 4 is a cylindrical roller. There is a spiral edge 5 on guide roller 1, which plays a role in pushing workpiece 4 forward. The cone angle of the spiral groove rolling surface cone of guide roller 1 and guide roller 2 is equal in size, opposite in direction, with parallel axis lines. The axis line of workpiece 4 is inclined to the left or right by 0.5 ° to 2 ° relative to its forward direction B α The plane formed by the upper busbar of workpiece 4 and the axis lines of guide rollers 1 and 2 is parallel. The diameters of the two guide rollers 1 and 2 are basically the same, and the rotation speed is the same. Under its support and drive, workpiece 4 rotates on one side and moves forward in the direction indicated by B. For every revolution of guide rollers 1 and 2, workpiece 4 moves forward by one pitch. Under the action of the vibration frequency f and pressure P of oilstone group 3, workpiece 4 can obtain a "logarithmic curve" convex shape as shown in Figure 5. Angle between the center of workpiece 4 and the center line of guide rollers 1 and 2 β Generally, it is taken from 12 ° to 18 °.
Figure 4 is a schematic diagram of the high-precision convexity of the tapered roller. The guide roller 6 is equipped with a spiral edge 9. The difference between guide rollers 6 and 7 and guide rollers 1 and 2 is that the cone angle of the spiral groove rolling surface cone is not equal, and the direction of the cone angle is opposite. The size of the cone angle is determined by the cone angle of the tapered roller. Workpiece 8 is a tapered roller, and the plane formed by the upper busbar of Workpiece 8 is parallel to the axis of guide rollers 6 and 7. The axis of Workpiece 8 tilts half of the cone angle of the tapered roller to the left or right relative to its forward direction B, plus an angle of 0.5 ° to 2 °. Under the support and drive of guide rollers 6 and 7, workpiece 8 achieves ultra precision convexity at the vibration frequency f and pressure P of oilstone group 3, and obtains a logarithmic curve outer diameter as shown in Figure 5.
Figure 5 shows the "logarithmic curve" shape of the basic cylindrical and tapered roller generatrix profile, when inclined α When the value of changes, the shape of the logarithmic curve shown also changes slightly.
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