RU1821333C - Device to control process of pieces combined processing by cutting and deforming tools - Google Patents

Abstract

Usage: mechanical engineering, namely, management of metalworking processes, in particular, combined cutting and surface plastic deformation by combined tools, and can be used in the processing of parts on machines having an automatic (adaptive) control system. SUBSTANCE: device for controlling a process of combined processing by cutting and deforming tools comprises first and second differentiation units connected in series, as well as a module extraction unit connected in series, a first restriction unit, an element, IL AND switching commutator and a second restriction unit, while the input the first differentiation unit is connected to the output of the conversion unit, and the output with the input of the module allocation unit, the output of the second differentiation unit is connected to the input of the second unit limiting the output of which is connected to the OR element, and a switching key is installed between the output of the comparison unit and the actuator. The device also comprises a switch and an inverter connected in series with the output of the second differentiation unit, the output of which is connected to the input of the second restriction unit. 1 s.p. f-ly, 1 ill.

Description

The invention relates to mechanical engineering, in particular to the management of metalworking processes, in particular, combined cutting and surface plastic deformation (PPD) combined tools, and can be used in the processing of parts on machines having an automatic (adaptive) control system.

The aim of the invention is to increase the accuracy of processing in longitudinal section by eliminating the effect of

shape errors in cross sections and stabilization of the measured signal.

The drawing shows a schematic diagram of the proposed device with a block diagram of a control system.

The device consists of a combined tool, including a cutting tool 2 located in one housing 1, rigidly connected to the housing 1 and a deforming tool 3, mounted in the housing 1 with the possibility of moving along the normal to the workpiece 4. The deforming element is spring loaded

to

With

With

with

an element 5 associated with the control screw 6. On the housing 1 there is a sensor 7 of elastic displacements of the housing relative to the part 4. The block diagram of the control system includes a measuring unit (IS) 8, the first 9 and three of 10 differentiating blocks (DB1 and DB2) defining unit (ST) 11, designed to set the specified value of the control signal corresponding to the specified nominal processing conditions; comparing unit (SB) .- comparator / 12, which serves to compare whitefish alvr. coming from measuring 8 and driving 11 .. blocks. The output of the comparator 12 is fed to the input of the commuting key (CC) 13 and through it the signal / i passes to the actuator (IM) 14, the latter directly performs the function of the operative influence etijifi: n; control switch 6, elastic element 5 and deforming tool 3 in the case. ; to receive the mismatch signal from the comparator 12 through the key 13. The switching key 13 is controlled by a low level: it sends the signal coming from the logic element OR 15, to the input of which two signals are sent from the first conversion unit (BP1) -.16; of the second block of signal conversion (BP2) .17,. The first block is 6a; negative; no 1 of signal 16 is connected to the output of the differential unit 9 through the conversion unit module 18. To the differentiator circuit: the circulating TO unit - the conversion unit - by signal 17, inverter C HB) 19 can be turned on. For this, switch 20 is used. - /; /:; , -.- ..: g

 The device operates as follows iptyi.-; :; -; ::; 4 .: v: ;;; : /.: / I-:.:: Y; ,: vj - .-.: - When machining part 4 with the specified conditions; the machining forces generated by cutting 2 and deforming 3 tools are squeezed., the case of the tool 1 is recorded by a certain amount, which is recorded by the sensor 7. When changing the processing conditions (for example, the current radius of the part caused by beating or cutting of the part has changed), Signal from sensor 7 enters the measuring unit 8, and to the comparison unit 12 ... The second input of the comparator 12 receives a signal from the master unit 11. The CUnal from the output of the kparator is supplied to the actuator 14 via a switch (key 13, which trlko opened in case of low-level signal ua klyucha13 control input. This is possible only at a time when the maximum signal level. To isolate macro-simelnbgr or minimum levels The signal from the measuring unit to catch 8

the measured signal is additionally supplied to two differentiating units 9 and 10 connected in series. In the first differentiating unit 9, the rate of change of the signal is obtained, and in the second 10, the acceleration. Obviously, the highest measurement accuracy is obtained at the moment when the rate of change of the signal is close to zero, and since it is equal to zero when reaching a maximum or minimum, it is necessary to take into account the acceleration sign at this moment. In order to isolate the zero rate of change of the signal and the sign of acceleration and convert these values to discrete

signal conversion blocks are used. module 18. and limitation 16 and. 1.7. The difference in the operation of conversion blocks 16 and 17 is that: in the first case, the zero level is assigned by v

It is hardly possible to straighten out the real zero, and in the second case, the zero level is assigned to a certain minimum value. niyu. The discretized signals from the first and second differentiating blocks 9 and 10 are fed to the OR logic element, which controls the switching key 13. The switching key will open the signal path to the actuator 14. It can be seen from the figure that this will happen in

the moment when the measured signal has a maximum. The actuator will cause the screw 6 to rotate. until it creates such a force on the deforming tool that the amount of mismatch on the comparator 12 becomes non-zero. The considered process occurs every time when the maximum signal passes during the processing of the part along the entire length.

To control the system at the minimum level of a periodic signal, an inverter 19 is installed, which provides a change in the levels of the logical signal from the output of the second differentiating block, and a switch 20.

- The advantages of using the apparatus of the invention are improved accuracy in the longitudinal section of the part. when processing parts having a shape error in the cross section.

Claims (2)

. Formula and sampling . 1. A device for controlling a combination cutting process. and deforming tools installed in the housing, comprising a housing elastic displacement sensor connected via a conversion unit to the input of the comparison unit, the second input of which is connected to the output of the setter, and the output is connected to the actuator a deforming tool, characterized in that, in order to increase the accuracy of the processing, the first and second differentiation units connected in series, the module extraction unit, the first restriction unit, the OR element and the switching key, as well as the second restriction unit are additionally introduced into the device wherein the input of the first differentiation unit is connected to the output of the conversion unit, and the output is connected to the input of the module allocation unit, the output of the second unit o the differentiation is connected to the inputs of the second limiting unit, the output of which is connected to the input of the OR element, and a switching key is installed between the output of the comparison unit and the executive input / output. ; 2. The device according to claim 1, moreover, in that it is added that it is switched on, connected in series with the output of the second differentiation unit, and the inverter is output, the output of which is connected to the input of the second unit is limited. : n 5