SU498149A1 - Device for grinding tool work surfaces - Google Patents

Description

The invention relates to a device for grinding work surfaces, for example, helical grooves of a tool.

Devices for grinding tool grooves, made in the form of the base and roll of the body of the workpiece from a camshaft with a worm gear, are known.

However, these devices have low accuracy and processing performance due to significant dynamic loads that occur during their movement of moving masses during processing, especially when processing parts of small length, t, which require a large number of double strokes per minute during processing.

The purpose of the invention is to provide high-precision and high-performance grinding of the helical grooves of a small-sized tool (0.1-2 mm), simplifying the kinematic scheme of the device and expanding its technological capabilities.

To do this, in the proposed device, the cam shaft is placed on the base, not supporting the pumping wheel, its tailstock lever, the swing axis of which is combined with the axis of the camshaft drive.

Swing lever provides longitudinal feed.

Specified tool core shape

(arcuate) is achieved by rolling the spindle of the product around the axis of the worm drive of the camshaft n of the system of copiers and stops.

To obtain core shapes that are different from the arcuate, the headstock of the product interacts with a flat copier fixed to the base of the device.

The drawing shows the kinematic

scheme of the proposed device for grinding screw grooves of the tool.

A worm to / and a worm gear 2 serve as a drive of a camshaft, on which a cam is fixed by a longitudinal feed 4 p

Cam 5 removal of the product from the circle. The gears 6 and 7 are the guitar and tunes of the pitch of the helix. In the headstock of product 8 there is a drive of the spindle of the product, consisting of a screw 9 and a worm gear 10, fixed on the spindle 11 with a collet chuck 12. To support the part, there is a steady rest 13. The swinging lever 14 is connected with worms 1 and 9 and roller 15 and tension spring 16.

cam 4. The spring is compressed 17 through the pusher J8 sliding along the rod 19, closes the workhead 8 by means of the roller 20; the cam 5 (for withdrawing the product to the right-side wheel) or through the adjustable stop 21 is swinging

lever 14 (at the beginning of the working stroke, or through

roller 22 — onto a flat replaceable copier 23 connected via a bracket 24 to a base 25 (when obtaining a core shape that differs from an arcuate).

When grinding the grooves of a small-sized tool with an arcuate core, the device works in the following way.

From the electric motor and the gearbox (not shown in the drawing), the rotation through the worm pair / -2 is transmitted to the cam shaft 3, and through the guitar 6-7 and the worm pair 9-W to the spindle // //. At the beginning of the stroke, the cam 5 is retracted from the roller 20, and the adjustable stop 21 rests on the swinging lever 14 (the copier 23 is removed or does not touch the roller 22}. When the cam 4 rotates, the roller 15 moves downward under the action of the spring 16, the swinging lever rotates around an axis worm / clockwise. Grandma of product 8, closed through an adjustable stop 21 on the swing arm 14 by means of a spring 17 (spring force 17 less than spring force / 5) also rotates around the axis of the worm / by moving the spindle // together with product 26 (machined tool) va right towards the grinding wheel 27. During the working stroke (left to right) on the tool vyshlifovyvaets helical groove the arc core. Step and the number of helical grooves on the tool depends on the setting of the guitar smeipyh wheels 6, 7.

At the end of the stroke, the cam 5, acting on the roller 20, turns the headstock 5 around the axis of the screw 9 clockwise, pulling the headstock away from the adjustable stop 21 and withdrawing the machined tool down from under the circle by an amount exceeding the depth of the groove. After that, the swinging lever 14 is reversed, which, rotating under the action of the cam 4 around the axis of the screw / in the counterclockwise direction, returns the product to its original position. A product (a machined tool) that has a continuous rotation in one direction after a forward and reverse stroke when dividing, comes to a position for smoothing out another groove. The angular step in the implementation of the division of the workpiece corresponds to the value equal to - turns, where

and

Z ,, is the number of tool grooves, k is an integer not a multiple of Z ,,.

; A new groove is being polished out in a new treatment cycle.

To obtain a non-arcuate core on the tool, for example, a cylinder, a cone, a paraboloid, a hyperboloid and other possible shapes, a flat copier 23 is used. The cycle is performed similarly as described, with the difference that the adjustable stop 21 does not contact the workhead 3 and The path of movement of the product 26 depends on the rotation of the axis of the screw 9 around the axis of the screw and the whole of headstock 8 around

the axis of the worm 9 according to the law specified by the copier 23.

Claims (1)

Invention Formula A device for grinding the working surfaces of an instrument, for example, the helical grooves of drills, made in the form of a base, carrying a table with installed on it the head of the product, kinematically connected with the drive of the swinging and rotational movement of the tool and provided with the supply and discharge cams, characterized in that. that, in order to increase the technological capabilities of the device, the drive of the rocking and rotational movement of the tool to be processed and the cams of the supply and removal of it are installed on the base of the device. J 2J 2 IJ : s 22 18 nineteen Th 25