SU748353A1 - Device for adaptive programme-control of machine tool - Google Patents

Description

The invention relates to automatics and, computer engineering, in particular, to systems of numerical software control by metal-cutting machines with setting information in a digital code. A device for adaptive control of the toolpath of a cutting machine tool is known, comprising a program input block connected in series, a comparison block connected to a power pyramometer sensor, control unit 1. The closest technical solution to this invention is a device for controlling a tool movement path comprising connected to the control unit of the movement of the tool in two coordinates, feed drives and sensor power force parameter, in which A sequentially connected block is entered for determining the position of the tool at the beginning of each rough pass; a block comparing the actual position of the tool

C p: c n5; F: ..: LLT is pre-set with the program and the Tool memory block at the moment of meeting the final draft contour of the part with the program, the outputs of the blocks indicated are connected to the control block 2. In such devices, the path control algorithm tool movement is determined by the method of calculating the value of the allowance for individual passes, which necessitates the use of a large number of memory counters and the complication of the device, and also necessitates measuring the workpiece and making it Ichin device by switching the respective switching nodes on the front panel. The purpose of the invention is to simplify the device. The goal is achieved by the fact that a device for adaptive software control of a machine, containing a power parameter sensor, an interpolator connected in series, a control unit 748353

neifflH and feed drives, as well as the program input unit, the first output of which is connected to the input of the speed setting unit, and the second output - to the first input of the interpolator, contains the first trigger, the pulse generator connected in series and the first element And, the first threshold element connected in series, the first element is NOT and the second element is AND, as well as the second threshold element connected in series, the second element is NOT, the third element is AND and the second trigger, the output of which is connected to the input of the control unit and to the input of the input unit and the second input - with the output of the feed drive and with the first input of the first trigger, connected by the output kr to the second input of the third element I, and the second input to the output of the second threshold element, whose input is connected to the output of the sensor of the power parameter and with the input of the first of the threshold element connected by the output Through the first element I to the second input of the control unit, and the second input and output of the second element I are connected to the output of the speed setting unit and to the second input of the interpolator, respectively.

FIG. 1 shows a block diagram of the device; - FIG. 2, the processing diagram of the part.

The device (see, fig. 1) contains a program input block 1, a speed setting block 2, an interpolator 3, an AND 4 interlock, a control block 5, feed drives b, a machine tool – fixture – tool – part system (AIDS) 7, sensor 8 power parameter, the first 9 and second Yu threshold elements, the first element And 11, the generator 12 pulses, the first element is NOT 13, the first trigger 14, the second element NOT 15, the third element And 16 and the second trigger 17,

The letters a, b, c, d, d, e, g, and (fig. 2) show the contour of the workpiece, and the numbers from 18 to 48 show the nodal points of the tool movement trajectory 49,

The device works as follows.

Let at the initial moment of time the instrument 49 be at the point O (Fig. 2), And in block 1 (Fig. 1) the first frame of the program is inserted containing the movement of the tool 49 (Fig. 2) from the point O through point a to Point b,

When the device performs this frame, tool 49 at point a cuts into the metal. On top of the sensor is a & (Fig. 1) a voltage proportional to the cutting force that is applied to elements 9 and 10 appears, the KOTopbix response thresholds are chosen so that at their outputs a single signal appears only when the cutting force exceeds the allowable and the signal on element 9 disappears when the cutting force corresponds to a given depth of cut, and on element 10, when the voltage at the output of the sensor is equal to zero,

At point 18 (Fig. 2), the cutting force increases to such a degree that its further increase results in either a tool breakage or an overload of the machine. In this position, the output of sensor 8 is set to a voltage that exceeds the response threshold of element 9 and 1O, and a single signal appears at their outputs. The output signal from element 9, inverted in element 13, closes element 4 for the passage of pulses from block 2 to block 3.

Frame processing is terminated. The same signal from element 9 opens element 11 and the pulses from generator 12 enter block 5 to retract the tool 49 along the X coordinate,

The output from element 10 is applied to trigger 14 and flips it to the opposite state. This means that tool 49 ... is retracted from the contour of the part. During retraction, tool 49 simultaneously cuts the end face of the part. At point 19, the cutting force drops to a level that corresponds to the tool’s exit to the Specified Cutting Depth. At the output of element 9, the single signal disappears, closes element 11 and opens element 4, and generator 12 is disconnected from block S. The retraction has ended,

At the same time, block 2 is connected again via element 4 to interpolator 3, the processing of the first program frame continues. Tool 49 (FIG. 2), continuing to work, this frame comes to point 20. At this point, the second program key is inserted, containing movement of tool 49 from point b to point c, but since tool 49 is at point 2O, then this frame, the tool goes out of the contour limit of the workpiece.

Claims (1)

1.Sb. Adaptive control of machine tools, M ", NIIMASH, C-Ij tankostroyenie, 1973, from 170-171. 2, USSR Author's Certificate N9 323766, cl. Q 05 B 19 / OO, 197O (prototype).