SU1509237A1 - Control device for grinder - Google Patents

Abstract

The invention relates to a machine tool industry and can be used to control a machining process on grinding machines operating by the method of longitudinal passes. The purpose of the invention is to increase the productivity of processing on grinding machines. The device contains a programming unit, longitudinal and transverse feed controllers, a control object, allowance sensors, a power parameter of the machining process and longitudinal feed speeds, as well as sequentially connected computing unit, a command generation unit and a key element. When the device is in operation, the longitudinal feed value is calculated on one pass, compared with the longitudinal feed optimum value, and the sign of the difference signal is monitored, depending on which the command to enable or disable the lateral feed drive for the next pass is formed. To calculate the average on one pass, the value of the longitudinal feed integrates the value of the longitudinal feed over a period of time inversely proportional to the optimal value of the longitudinal feed, and judging by the value obtained, the longitudinal feed is calculated on the average of one pass. 1 hp f-ly, 4 ill.

Description

The invention relates to a machine tool industry and can be used to control a machining process on grinding machines using their method of longitudinal passes.

The aim of the invention is to improve processing performance.

FIG. 1 is a block diagram of the device; in fig. 2 is a block diagram of a computing unit; in fig. 3 - timing diagrams of changes in voltage signals at the outputs of the main elements of the system; in fig. 4 - area of the task of the productivity function in the plane of regulating parameters.

The device contains a programming unit 1, the first output of which is through the regulator 2 longitudinal feed, and the second output

through the serially connected key element 3 and the cross feed regulator 4, are connected to the inputs of the control object 5. The first output of the control object 5 through the allowance sensor 6 is connected to the programming unit 1, and the second output through the sensor 7 of the power parameter of the process is connected to the second input of the longitudinal feed controller 2, the output of which is also connected to the longitudinal feed speed sensor 8. The output of the sensor 8 of the speed of the longitudinal feed is connected to the third input of the regulator 2 of the longitudinal feed and to the input of the computing unit 9, the second input of which is connected to the second output of the regulator 2 of the longitudinal feed. The output of the computing unit 9 through the command generation unit 10 is connected to the control input of the key element 3.

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Computing unit 9 consists of a serially connected key element 11, an integrating device 12 and a differential amplifier 13. The inputs of the key element 11 are connected respectively to the first directly, and the second through the time relay 14 and the zero element 15 to the output of the sensor 8 for the longitudinal feed rate. The second output of the null organ 15 is connected to the control input of the key element 16 connected in parallel to the input of the integrating device 12, consisting of a source follower 17 with an integrating capacitor 18 at the input.

From the area of setting the productivity function (Fig. 4, line P) it can be seen that the maximum productivity of the grinding process is achieved by selecting and automatically maintaining onti.mal modes S and 1d "(point AJ. Grinding wheel blunting, its wear and increase in material hardness of the workpiece leads to an increase in the power parameter of the treatment process (for example, power) under other equal conditions. At the same time, if the value of the actual transverse feed remains the same (), the stabilization of the power parameter is achieved by measuring longitudinal feed SM, the average value of which decreases to the value SM, (point A.,). Under these conditions, to ensure maximum productivity, it is necessary to maintain the constant value of the longitudinal feed at Swo, which is achieved by decreasing the actual cross feed to a value of 1 to 1 (point A ").

The essence of the invention is as follows.

In accordance with a predetermined program and the value of the current allowance for processing, the magnitude of the cross feed from the passage to the passage (or through a double stroke) is changed and the power parameter of the treatment process is stabilized along the length of the table by adjusting the longitudinal feed. At the same time, with stabilization of the power parameter on the pass (along the whole stroke or on its part), the mean value of the longitudinal feed is calculated, compared with the optimal value, and the sign of the difference of the signal is monitored. If the mean value of the longitudinal feed at the 5msr passage is greater than or equal to the optimal value (5msr –SMO O), then a command is generated to turn on the cross feed drive. In this case, in accordance with a predetermined horizontal frame, the magnitude of the transverse feed is adjusted to a predetermined discrete level for the next pass (or double stroke). If the average value of the longitudinal feed in a passage is less than the optimal value (-JMO - 0), then a command is generated to shut down the drive by

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pepper feed. In this case, in the next pass, the amount of motorized cross feed is zero, and the actual cross feed is reduced (usually exponentially) to the desired value. On the next pass (or double turn) SMCP S

When reconfiguring the machine to machining other parts and changing the optimal modes to increase the accuracy of calculating the average on one pass, the longitudinal feed value integrates the longitudinal feed value over a time interval that is inversely proportional to the optimum longitudinal feed value, and judging the average value obtained in one pass longitudinal feed.

Thus, during processing, the constancy of the average value of the longitudinal feed is maintained at the level and provides maximum performance when the grinding wheel is blunt and worn, increasing the hardness of the workpiece material and the effect of other disturbing factors on the course of the treatment.

The device works as follows.

Programming unit 1 generates voltage signals that simulate a program of changes in the power parameter of the processing and cross-feed as a function of the current allowance for processing. The voltage proportional to the current allowance for processing is removed from sensor 6. For the length of the table travel, the device operates as a system for stabilizing the power parameter of the processing process by adjusting the longitudinal feed. FIG. Figure 3 shows diagrams of voltage signal changes at the first (q :) and second () outputs of the programming unit 1 in a time interval equal to the time of several passes. The change in the magnitude of the cross feed is carried out at the moments of the reverse of the table stroke. The duration of the control pulse U, (4 :) is determined by the speed of the drive of the transverse feed of the regulator 4. At 5 "cf (in Fig. 3, the condition is fulfilled at 1, 2, 4 and 5th passes) the control signal and, O P ) at the output of the command generation unit 10 at the time of table reversal is absent (due to the delayed response time, which is chosen longer than the signal U time, driven by the lateral supply of the regulator 4) and the Uf signal (Fig. 3) passes through the key element 3 for the drive lateral supply of regulator 4 (U f (t), fig. 3). At the point in time when (when reversed), the null-body 15 is triggered, which first output switches on the relay 14 times from

time release, and the second output closes the key element 16, thereby discharging the capacitor 18 of the integrating device 12. The relay 14 short circuits the key element 11. At the next time when 5 ", the zero-body 15 opens the key element 16 and the deactivation of the time relay 14, which, with time delay, opens the key element 11. The time delay for releasing the relay 14 is inversely proportional to the optimal value of the longitudinal feed of the reg Alternator 2, also coming to the second input of the differential amplifier 13. During the time period, the signal from the output of sensor 8 is integrated by device 12 and supplied to the comparison with the signal from regulator 2 to amplifier 13. Condition U, i Ujp On the third pass, in connection with which the output of the command generation unit 10 at the time of the table reverse is the control signal of the key element 3 (U, of (4;)) and to the input of the transverse supply drive of the regulator 4 the control signal from the block 1 does not arrives. The magnitude of the discrete transverse feed for the fourth pass is zero (U ()). In the next pass (Fig. 3), the process optimality condition is fulfilled.

Block 10 can be made as a relay with time delays for actuation and release, which is necessary to control the signal from the output of block 1 to controller 4.

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Claims (2)

1. A device for controlling the machining process on a grinding machine, which contains a programming unit connected by outputs of longitudinal and transverse feed regulators to the inputs of the control object, the first output of which is connected to the programming unit through the allowance sensor and the second output is connected through the sensor of the power parameter of the processing with the second input of the longitudinal feed controller, the output of which is connected to the longitudinal feed speed sensor, characterized in that, in order to increase the processing performance, Successively introduced are the serially connected computing unit, the command generation unit and the key element connected between the programmer and the cross feed controller, and the logic steps of the computing block are connected respectively to the output of the longitudinal feed speed sensor and the second output of the longitudinal feed regulator. 2. The device according to claim 1, characterized in that the computing unit consists of a second key element connected in series, an integrating device and a differential amplifier, the inputs of the second key element being connected to the first one, respectively, directly, and the second through a time relay and zero organ to the sensor output the longitudinal feed rates, the second zero-organ output being connected to the control input of the third key element connected in parallel with the input of the integrating device. Phie.1 and Xii L..J / h -V F5 and 1 About fl f fl M  S L : /ABOUT  five 7 To block h From controller 2 Phie.g FIG. five s MMW " / 77.