SU84961A1 - Adjustment to milling and drilling machines for cutting screws with irregular arc pitch - Google Patents

Description

FITTING FOR MILLING AND DRILLING MACHINES FOR CUTTING WORMS WITH A UNEQUILIBRARY ARC

Filed on August 4, 1949. No. 402276 for the USSR State Technical University

The subject of the invention is a tooling for cutting machines for cutting screws with irregular arc pitch.

Existing devices of this kind are intended for use only on gear milling machines. In these tools for mounting the workpiece, the spindle head of the machine is used, and the milling head is placed on a rotating table, the kinematic connection of which with the spindle supporting the workpiece is carried out by the mechanism of the gear milling machine .

The proposed device gives wider possibilities for its use on universal machines. For example, vertical milling or drilling, as a result of the fact that in it the dependent rotation of the workpiece is carried out in addition to the kinematic chains of the machine mechanism.

For this, the headstock, carrying the workpiece, is placed directly on the turntable itself, and its spindle is kinematically connected with it by means of a planetary gear.

The drawing shows a spatial diagram of a device for cutting worms with an uneven arc pitch on a vertical milling machine with a rotary table.

On the rotary table of the machine, rotated by the worm gear I, a plate 3 is installed on the rack 2, which receives rotation from the rack through the socket key. This allows the plate to have a vertical range relative to the rack within small limits. The headstocks are mounted on the slab, bearing the mandrel with the workpiece 4. One of the heads is the leader and its spindle 5 is connected by a lead with the workpiece. The spindle 5 is through a pair of bevel gears and a spur gear 7

N.A. Radochin

STEP

kinematically connected with the wheel 8, loosely unwelded on rack 2. The gear 7 is planetary and rolls on the wheel 8 when the table is rotated, transmitting a rotary motion to the workpiece. When the wheel 8 is fixed, the workpiece rotates with respect to the vertical milling cutter 9, which is installed in 1-pp: lele of the machine, cutting the worm with a given rhg and a dimensional step along the arc, the radius of which is determined by the distance between the axis of rotation of the table and the axis of the milling cutter. as arc u g cut the screw should be uneven-dimensional, the device is equipped with a correction copier 10 fixed on the plate Z. The copier 11 interacts the lever 11, on one shoulder of which a copier roller is placed, and on the other a toothed segment interlocking with the wheel 8. By rotating the plate 3 together with the table, the copier 10 acts on the lever 11 and informs the wheel 8 uneven rotation, thanks to which additional rotation is transmitted to the workpiece, ensuring that the uneven pitch is obtained in accordance with the prescribed law of its change.

Since when cutting a screw thread when moving the cutter in an arc, the depth of milling of the groove continuously changes, plate 3, along with the workpiece, receives during its rotation a corresponding vertical movement using three symmetrically arranged and rigidly connected copiers 12 with which the plate rests three rollers 13 mounted outside the re-table.

Subject invention

Claims (5)

1. Adjustment to milling and drilling machines for cutting worms with irregular arc pitch using a rotating table kinematically connected with a cutting worm, designed to carry out a relative circular movement of the mill axis along the worm pitch using an additional corrective copier. the fact that, in order to implement the rotation of the workpiece without using the kinematic chains of the machine mechanism, the grandmother carrying the workpiece is placed on the turntable and its spindle tically associated with it through planetary gear. 2. The shape of the device according to claim 1 is different in that, in order to communicate an additional rotation of the workpiece when the table is evenly rotated, the sun wheel of the planetary gear is kinematically connected with a correction copier rigidly fixed on the turntable. 3. The form of implementation of the device according to claims. 1 and 2, characterized in that, in order to realize the relative axial moving the cutter in its circular motion relative to the workpiece; the turntable, together with the spindle head carrying the workpiece, is made movable in the direction of its axis. 4. The form of the implementation of the device pop. 3, characterized in that for the axial displacement of the table, copiers are used. 5. The form for making the device according to claim 1, p tl l is tive, with the fact that the solar wheel of the planetary gear is freely mounted on the axis of the turntable, and the axis of the satellite, kinematically connected with the babhi rod, is secured in the turntable.