SU863315A1 - Device for dressing a grinding wheel along an arc of a circle - Google Patents

Description

(54) DEVICES® FOR THE EDITION OF THE GRINDING CIRCLE

ON ARC CIRCLE

I

The invention relates to mechanical engineering and can be used in the manufacture of core parts.

A device for straightening a grinding wheel along a zug of a circle, a social tool and a movement drive l is known.

This device does not provide high durability of the instrument, as it works with the same area of its measurement.

It is also known a device for straightening a shaped circle along an arc, comprising a rotary bracket fixedly mounted on a welded shaft, on which a carriage with a right-hand tool is mounted movable in the tangential direction, and a carriage movement actuator made in the form of a toothed rack and gear drive, driven the wheel of which is in engagement with the toothed rack of the carriage | .2 J.

This device also does not provide increased durability of the right

tool because of the significant extent of the contact zone of each area of the right tool with the grinding wheel.

The aim of the invention is to increase the durability of the right tool.

The goal is achieved by the fact that the toothed gear of the device is designed as a fixed central gear wheel 0 installed coaxially with the drive shaft and a planetary gear wheel rigidly mounted on the same axis with the driven wheel, which is engaged with the central gear wheel, and the gear ratio of the gear pair

formed by the central and planetary gears is equal to the ratio of the diameter of the arc profile of the grinding wheel to the diameter of the pitch circle of the driven wheel.

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The drawing shows the structure of the proposed device.

Claims (2)

The device consists of a base 1, on which the central gear wheel 2 is fixedly mounted. Inside it is coaxially with a gear wheel drive, it is installed with a outboard shaft 3 with a swivel bracket fixed on it 4. On the swinging bracket 4, the axis 5 is fixed with the possibility of rotation fixed on it by a planetary gear wheel 6, which is engaged with the central gear wheel 2, and the driven wheel 7, which is engaged with the gear rack 8. The rail 8 is attached to the carriage 9 mounted on the swivel bracket 4 spacer tangentially oriented linear guides. On the carriage 9, a holder 10 is mounted with a right-hand tool in the form of, for example, a cylinder 11 having the possibility of rotation. The tool is positioned in such a way that its axis is parallel to the carriage guides and is in the same plane with the axis of the wheel being profiled. A gear 12 is attached to the shaft 3 and serves to communicate with the drive (not shown). Before profiling, the right tool 11 is set at a predetermined radius of dressing. Gear 12 from the drive imparts a swinging motion, which is transmitted through shaft 3 to threshold arm 4 and with it to the right tool 11, allowing the tool to rotate around an axis passing through the center of the arc of a circle being profiled. Simultaneously, the planetary gear 6 rolls around the central gear 2 and turns the axle 5 with respect to the swivel bracket and the driven wheel 7 fixed on it, which moves the rail 8 and the carriage 9 associated with the rail 9 with respect to the swivel bracket. Together with the carriage ne, the holder is positioned with the right-hand tool 11. The forming tool of the tool moves along a tangent to the profiled arc of a circle passing through the point of contact of the generator with the profiled arc. The magnitude of this movement is equal to the product of the arc radius of the profile of the grinding wheel and the angle of rotation of the bracket, provided that the radius of the central gear wheel R, the radius of the planetary gear wheel Rt and the pitch diameter of 5 circumference 3) of the driven wheel are related by the relation r ,, Ri where c3 diameter of the arc profile abrasive wheel. As a result of the addition of two movements, one of which is the rotation of the forming tool of the right-hand tool around the axis passing through the center of the profiled circular arc, and the other moving it along the tangent to the profiling arc passing through the point of contact of the generatrix with the profiling arc by equal to the product of the radius of the arc of the profile and the angle of rotation of the bracket, a rolling movement is obtained without sliding the generator of the right tool along the profiled arc of a circle, which increases the durability of the tool enta. Apparatus of the Invention A device for straightening a grinding wheel along a circular arc containing a swivel bracket rigidly mounted on a drive shaft, on which a carriage with a right-handed tool is mounted in the tangential direction, and a carriage moving in the form of a toothed rack and gear drive mounted on the carriage, The driven wheel of which is engaged with the toothed rack of the carriage, characterized in that, in order to increase the durability of the right tool, the gear is performed and in the form of a fixed central gear wheel mounted coaxially to the drive shaft and a planetary gear wheel rigidly mounted on the same axis with the driven wheel, which is engaged with the central gear wheel and the gear ratio of the gear pair, Formed by the central and planetary gear wheels, is equal to the ratio of the diameter of the arc of grinding wheel circle to the diameter of the pitch circle of the driven wheel. Source of information taken into account in the examination 1. Balance-free editing of a grinding wheel. M., Mashgia, 1951, p. 315. 2. USSR author's certificate N9 632560, cl. B 24 B 53 / O6, 1977. " s