SU726745A1 - Feed drive control system of gear cutting lathe - Google Patents

Description

Trim plus trajectory of production gearing in relative movement on a product, in what is called a trajectory. Being the result of the addition of two movements: a valid one in the feed direction and a rotational motion around the axis of the workpiece, this trajectory for the case of processing a cylindrical gear wheel has the form of a helical line with a step So6 (Fig. 1). It is precisely the IB basics: the nominal one determines the cutting force, the removal of the metal, and, besides, the cutting speed, has an effect on the tool life, in connection with this adjustable parameter. It is the name of the effective data supply for the preparation turn (S, g) The concept of the effective feed per revolution of the workpiece is entered to fly away from its instantaneous value, geometrically interpreted by the lifting angle (K) of the helical trajectory. Known control systems OSUSH. The change in shtavite trajectory is due to the change of its angle of ascent, which implies a mandatory change in the ratio of the feed and rotation speeds of the workpiece {5; 7/3).

But the pitch of the helical path may change in a different way. If the feed rate is periodically changed according to the law of a rectangular pulse (in the particular case, periodically turn on and off the feed rate) at a constant period, width and plit and if these changes are carried out an integral number of times for each revolution of the workpiece, for example, once, This is a semi-1H broken-down helix with STANDS. in steps (Fig. 2). ,

The pitch of such a blocking helix can be changed by varying the width of the pulse. The value of the feed rate can be sent to the JUST and Provided over the adjustment range (Fig. 3).

The feed control system of the gear milling machine (Fig. 4) contains a track switch 1, which is mounted on the body of the spindle. On the eipindel there is an element 2 interacting with the path switch 1. The path switch 1 is connected to block 3 time relays, controls the first electromagnetic clutch 4, and also to the input of logic circuit 5, made on the basis of electromagnetic relays, - - As a time relay 3 Used electronic relay having 5 inputs.

The system works as follows. B, the moment of mutual action of ONE Element1 in 2 with track 1m 1 installed on the spindle, the latter gives the command to turn on the auxiliary device .. Beginning two times at a given speed. At the same time, the W Coman; th 5th 11th CI is a Scheme in the correspondence of the XdtaXwrooH HOww.BdjodH ionin gve e iia

one, from the input of time relay 3 and makes it start. After the shutter speed for which this input is configured, the time relay drops a command to shutdown to the actuator. Before the path switch interacts with the next circumferential element, the feed movement is stopped.

At the moment of interaction of the path switch with the next element, the command is again given to turn on the actuator and switch another input of the time relay. As a result

This produces a sequence of rectangular pulses of the feed rate with a period, in general, the number of times smaller than the period of rotation of the workpiece, and with a width that changes from pulse to pulse for a given

the program. Thus, the system functions throughout the entire processing cycle. The combination of a set of discrete values of pulse durations and their sequences provide the specified

the law of regulating the feed per revolution of the workpiece.

As an example of implementation, the system. Was built into a special gear milling machine, whose feed drive contains an asynchronous electric motor and a stepped box with an electromagnetic clutch that switches the chain of working feeds.

Claims (1)

Invention Formula The feed drive control system of the rolling-milling machine, comprising an actuator, an actuating device, a direction switch, components that interact with it, for example, pressure stops and a relay circuit, in order to expand its field of application, the system equipped with a relay: Time; and with setting elements and a time delay and logic block, the input of which is connected to the track switch, and the output is connected to the input of the time switch, which is in turn connected to device, and the pressure stops are installed on the spindle of the product and are located on a circle, concentric axis rotation of the product spindle, on equal angles from each other in quantity, equal to the number of pulses of the feed rate per revolution of the product spindle. Source .Information, taken into account in the examination: .. I. Kosak J. New Rolling Milling Machine, “Czechoslovakian Heavy Industry, 1974, No. 3. VfCOnsi-; wD- " , , v fai.3