SU61430A1 - Centerless grinding machine for balls - Google Patents

Description

Usually, after punching, the balls are processed on filing machines, where the burrs are removed, the poles and the upper crust, then the balls are processed in drums, which smooth the scars, which are obtained during processing on filing machines. In this form, the balls are rolled between two profiled discs, and then go to quenching. The hardened balls are placed back on the liter wheels for further processing. The final manufacturing operation of the balls takes place in drums where the balls are processed first with Viennese lime and then with pieces of leather. All ball treatment operations, except drum processing, occur with kerosene cooling.

In order to speed up the process of making balls and eliminate kerosene consumption, a machine is offered for centerless grinding of balls into the passage between the grinding and driving wheels with closed annular grooves, the feature of which is that there are channels in the body of the driving wheel to move the balls from one groove to another.

The proposed machine can be used to process the balls starting from filing and finishing by grinding in the hardened state, all the operations being performed with cooling with emulsion or soda solution, and not with kerosene, as is currently being done.

FIG. 1 is a side view of the machine; FIG. 2 - its top view; in fig. 3-view of the leading drum from the side of the grinding wheel (drive, etc., details of the existing centerless grinding machines are not shown); in fig. 4-7 sections along one of the grooves of the driving circle.

The grinding wheel / has concentric grooves tucked in with a radius equal to the radius of the ball being machined. Leading circle 2 also has concentric grooves, but sinusoidal proJVb 61430-2fil. The balls 4 lie on the knife 3, the body of which goes along the profile of the leading drum for a length greater than the length of the transition channel 5.

Grinding and leading circles rotate clockwise with the ratio of peripheral speeds normal for centerless grinding; the ball from the loading device (not shown in the diagram) is fed to the knife 3 to the first groove of the drive wheel and, when it enters the hole of the transition channel 5, passes into the second adjacent groove where its processing begins, then it passes from the groove to the groove through the transition channels 5 , 5, 5, etc. with each turn of the driving circle.

If the ball is placed between two circles with grooves that do not have a sinusoidal profile, the axis of rotation of the ball will be parallel to the axis of the grinding wheel and the drum (Fig. 2), i.e. the equator will be cleared, and the poles will not be ground and only when the transition to another trough can be obtained according to the theory of probability that the ball will go under the grinding wheel as a pole. In order for the ball to be cleared on all sides in one channel, it is necessary to force it to change the direction of rotation, which is achieved by using a sinusoidal profile in the concentric grooves of the drive circle.

From FIG. 4, 5, 6 and 7, depicting sections of one of the leading grooves in various places around the circumference, it can be seen that the x axis of rotation of the ball changes its direction depending on which points of the ball rest on the groove walls of the drive circle.

Subject invention

A centerless grinding machine for the balls between the grinding and driving wheels with closed annular grooves, characterized in that channels are provided for transferring balls from one groove to another in the body of the driving circle.