SU1202726A1 - Device for breaking chips - Google Patents

Description

120272t

the invention relates to processing

on a legal basis

metal cutting and can be used to crush the drain chips when machining parts on numerically controlled machines (CNC) o

The purpose of the invention is to improve the quality of machined surfaces by increasing the dynamic characteristics of the driven mechanisms during the operation of the machine using a chip breaker.

The drawing shows a block diagram of the proposed device.

The device contains a contactless 1 spindle speed of the machine, the output of which pa1) is connected to the input of the former 2 for the duration of the pulses of the machining part and to the input of the former 3 for the pulses of the stop of the cutting tool, the on- 8 to the output of the imager 2 of the duration of the pulses of the part machining period, with the decoder 5, to the output of which a combination switch 6 is connected to the machining period of the part to intervene trigger 7 of the first deceleration stage, the unit input of which is connected to the first circuit 8 of the combinatorial switch 6 of the part machining period, and the zero input is connected to the output1; decoder 5, intermediate trigger 9 of the second braking stage whose single input is connected to the second depot 10 of the combined switch 6, and the zero input to the output of the decoder 5, intermediate trigger of the 11 third stage of the brakes, the single input of which is connected to the third circuit 12 of the combination of the legs of the switch 6, and the zero input - with the output of the decoder 5, controlling the trigger 13; the single input of which is connected to the fourth circuit 4 of the combined switch 6, and the zero shoulder output is connected to the frequency divider 15 of the CNC system, to the reset circuit of the 16 counter 4 number of pulses of the part machining period and with another input of the former 2, the duration of the PM pulses of the part machining period, counter 17 of the number of pulses of the period of the break; the chips of the chips connected to the output of the Fog P1p15atel 3. duration

0

ow perio; tl residue cutting tools, switch 18 period of interrupting chips. BMXOJI, which is connected to the zero input of the control trig: erra 13, and the input of the switch 18 to the output of the counter 17 of the number of pulses from the interrupt period: chip failure while zero outputs are intermediate-. x; triggers 7 .. 9 and 11 are supplied to the Jib 15 split of the CNC system frequency, a single output is triggered; its trigger 13 is routed to another input of the forwarder 3 durations of the pulses of the cutting tool stopping period and the output from block 19 of auxiliary commands set The CNC is fed to the input of the miniature. 2 of the duration of the parameter p ariod, the processing of the part while the output from the generator 20 of the specified frequency of the CNC system is fed to the frequency 15 of the CNC system,

The device works as follows

With the appearance in the processing program, 1 ci of the detail of the command to turn on the device in operation in order to ensure transmission of the information to the control system. t-cutting tool cutting tool from the 19th command unit of the NC system receives a signal to allow the driver 2 to continue, or more: to work the parts of the part-time period for passing the pulses from the 3th stroke of the coping patch; 1kz 1 to the input of the 4-pulse number

machining period, I

If there is a permitting signal for the input of the forma- rizer 2, the long-term impedance of the component and the enable signal from the output; the trigger arm of the trigger trigger 13 impulses from the contactless dg: T1-1ICa, 1 are received through the form :: - Grov11 2 the duration and pulses of the period, the machining of the part to the input of the counter 4, to the output of which is connected the desh; Frator 5 and combined switch 6 o

The required part machining period is set to the combined switch, 11th b, the position of which is selected1-: is grinded depending on the diameter of the workpiece and the cutting pattern, simultaneously setting the beginning of the braking section of the machine’s feed drives;

By extracting the required number of pulses from the counter 4 for the first stage of braking, the signal from the first circuit 8 of the combined switch 6 sets the intermediate trigger 7 from the initial zero state to one, then selecting the required number of pulses dp of the second braking stage, the signal from the second circuit 10 combined switch 6 sets intermediate trigger 9 from the initial zero state to one. Having also selected the required number of pulses for the third stage of braking, the signal from the third circuit 12 of the combined switch 6 sets the intermediate trigger 11 from the initial zero state to one and, selecting the necessary number of pulses to stop the cutting tool, the signal from the fourth circuit 14 of the switch 6 sets the control trigger 13 from the initial zero state to one.

Intermediate triggers 7, 9 and 11 of the first, second and third stages of deceleration from the output of zero shoulders sequentially in time issue prohibitory signals to frequency divider 15, the input of which is supplied with a reference frequency from the generator 20 of the CNC system, thereby providing a sequential stepwise decrease in the frequency of pulses the output of the divider 15, which leads to a stepwise reduction in the feed of the drives of the machine.

A control trigger 13 from the zero-arm output issues a prohibitive signal to the input of the frequency divider 15 of the CNC system, to the input of the former 2, the pulse duration of the part machining period, and the number of pulses of the machining period is reset to the initial state of the counter 4 via the reset circuit 16.

At the output of the divider 15, the frequency of the CNC system will have no processing pulses, which will be blown for subsequent conversion and penetration of the machine’s stepping motors to the pilot until the control trigger 13 returns to its initial zero state, as well as from the output of the proximity sensor 1 pulses will not be through the driver 2 to the input of the counter 4 pulses of the period of machining. At the same time with

The 3TViM control trigger 13 from the single arm provides the enable signal to the driver 3 for the duration of the chips interruption period pulses.

The pulses from the contactless sensor 1 of the spindle speed of the machine pass through the shaper 3 of the pulse duration, arrive at

the input of the counter 17 of the chip breaking period, to the output of which the switch 18 of the chip breaking period is connected.

By extracting the required number of pulses from the counter 17 by the switch 18, the signal arrives at the zero input of the control trigger 13, returning the control trigger from the unit to the initial zero state.

The control trigger 13, returning to the initial state from the output of the unit arm, supplies a prohibition signal for the passage of pulses from the proximity sensor 1 through the driver 3 of the duration of the chips interruption period to the input of the counter 17.

At the same time, the output of the zero shoulder of the control trigger 13

The resolution signal is applied to the input of the frequency divider 15 of the CNC system, thereby providing output processing pulses to the output of the CNC system and to the input of the shaper 2 liters of the subsequent passage of pulses from the output of the proximity sensor 1 to the input of the counter 4 of the number of pulses of the part processing period.

By extracting from the counter 4 the required number of pulses for implementing the first stage of acceleration of the feed drive, the signal from the output of the decoder 5 is fed to the zero input of the intermediate trigger 11, returning it to the zero initial state, then after a time interval, lifting the following number of pulses from the counter 4 to the second stage of acceleration of the feed drive, the signal from the output of the decoder 5 is supplied

to the zero input of intermediate trigger 9, returning it to the zero initial state and, finally, after a time interval, after selecting from counter 4 the necessary amount

pulses for the implementation of the third stage of acceleration of the drive feed, the signal from the output of the decoder 5 is fed to the zero input of the intermediate trig

Hera 7, P5 is its initial state.

Thus, the successive return of the intermediate intermediate trigger 11 of the third braking stubbing, intermediate trigger 9 of the second retarding stage and intermediate trigger 7 of the first braking stage to the initial zero state results

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Editor A. Shandor

Compiled by V. Alekseenko

Tehred A. Kikemezey Proofreader L. Patay

Order 8355/12

Circulation 1085

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Design, k

to successively removing the crossing signals from the divider 15 frequency c: the CNC system, which results in 1 sequential stepwise increase in the frequency to the specified value at the output of the divider 15, which ensures a consistent increase in the feed of the machine drives to the specified 10 program value.

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Claims (1)

DEVICE FOR CRUSHING CHIP ON numerically controlled machines, containing a counter for the number of pulses of the part processing period with a decoder, the output of which is connected to the part processing period switch, a control trigger, the single input of which is connected to the part processing period switch, and the zero-arm output is connected to the divider the frequency of the CNC system with a reset circuit for the counter for the number of pulses of the part machining period, the counter for the number of pulses for the chip interruption period with the chip interruption period switch and, pulse shapers of the machining period of the part and the period of shutdown of the cutting tool and a non-contact spindle speed sensor of the machine, characterized in that, in order to improve the quality of the machined surfaces by improving the dynamic characteristics of the drives, it is equipped with at least three intermediate triggers, and a switch the processing period of the part is made combined, the first circuit of which is connected from the output of the decoder to a single input of the first intermediate trigger, the second circuit is to the single input of the second intermediate trigger, the third circuit to the single input of the third intermediate trigger, and additional parallel circuits connected from the decoder to the zero inputs of all intermediate triggers, the zero outputs of which are connected to the frequency divider of the CNC system.