SU577097A1 - Device for actuating the centre of the tailstock of a lathe - Google Patents

Description

one

The invention relates to mechanical engineering, in particular, to accessories for lathes intended for the manufacture of products such as curvilinear mandrels for cold rolling mills.

It is known a device in which the center consists of a mandrel, rolling bearings are installed on a ne, and an eccentric holder is mounted on them with the possibility of rotation and an eccentric cone l is installed.

The disadvantages of the known device are the low accuracy of the adjustment and the impossibility of the stepless adjustment of the position of the center of the tailstock.

It is also known a device for turning stock headstock, comprising a tailstock body, an extension attached to it, a cent with a shank fixed in a supra, elements of deflection and center fixing, a center displacement indicator, and an actuator 2j.

To increase the accuracy and expand the range of possible movements with continuous and stepless adjustment of the center position when machining the profile mandrels of pilger mills for cold pipe rolling, the elements of center deflection and fixation are made in the form of two diametrically

located sectors, rigidly fastened to the vertices and mounted on the axis of rotation, fixed in the slider with a groove, the lower sector has teeth that engage with a screw, and

the upper sector is provided with a groove made in the form of a segment of the Archimedes spiral, equal in width to the diameter of the neck of the shank and the bows of the shank along the cut part with the chassis

landing.

FIG. 1 shows the proposed device, a general view of FIG. 2, a cut is shown, A-A in FIG. one.

The device consists of a body 1 of the tailstock; extensions 2 with a groove fixed in the case of the tailstock of the center 3 with a shank, mounted in the groove of the extension 2 and in the groove

the upper sector 4 elements of the center deflection and fixation. The pa-upper sector is made in the form of a segment of Archimedes' spiral, which is equal to the diameter of the shank neck and is wrapped around the shank

parts with running landing. The lower sector 5 of the center deviating and fixing element has teeth that engage with a screw 6. Both sectors, which are diametrically and rigidly bridged with their vertices, are mounted on axis 7, which is fixed in the extension 2. anti-friction gaskets — bronze washers 8; a spring 10 is installed under the clamping elements of the nut 9; a worm has an actuator, which includes a shaft 11, a gearbox 12, an electric motor 13, and a command device 14. The eccentricity indicator 15 is mounted on extension 2.

To ensure the infinitely variable positioning of the center without stopping the machine, the device operates as follows.

From the command device, according to a predetermined program, the rotation of the electric motor 13 is set, which, through the gearbox 12, transmits the rotation to the worm 6 ,, which turns the lower sector 5 on the axis 7 at a given angle. A groove made in the form of an Archimedes spiral segment in the upper sector 4 causes the center 3 to rise or fall, the shank of which moves in the slot of the pulley 2. The fastening elements of the center - spring 10 and two bronze washers 8 allow the center 3 to move freely with the tail

with constant effort. Fixing the position of the center is provided by a self-braking worm gear and a slope angle of the groove made in the form of a segment of the Archimedes' helix. The pulses transmitted from the device following the mandrel geometry are compared with the specified dimensions.

and from the analyzing system are transmitted to the control unit, where the program is adjusted in the right direction, and then a corrected command is issued to move the center.

Claims (2)

1. USSR author's certificate 340485, cl. B 23 B 23/04, 1969. 2.Druzhinsky I.A. Methods for processing complex surfaces. M., Mashgiz, 1961. Aa Fi & .2