SU807235A1 - Programme-control device - Google Patents

Description

one

The invention relates to automation and computer technology and is intended for numerical control of software equipment, for example, in the preparation systems of control programs, in coordinate measuring machines and in numerical control systems (CNCs) of machine tools.

A CNC device is known that contains a tape drive mechanism connected in series, a program input and control unit, a memory unit, an interpolishing module, a drive control unit, a feed drive, sensors, converters, and an adder, as well as an input control unit that is connected to the tape with the output, the interpolator and the adder, and the second output of the latter is connected to the input of the memory unit.

The device shortens the time of liquor short circuit, such as 4epV during the CNC process, electric welding ..

However, the device has an insufficient program input speed.

working out curvilinear contour sections.

Software control devices are also known.

 An input block, a memory block, an interpolation unit and a control unit, which, with the aim of improving speed and accuracy, are accepted

e additional input block and nutritious blocks 2 and Сз.

However, this complicates the hardware implementation of devices, but not the noBfaiuaeT of the speed of the input block, which ultimately depends on the speed of the device as a whole.

The closest to the technical essence of the proposed is a device for nporpeiMMHoro control, built on the basis of linear

0 an interpolator and containing a serially connected input block, a packet block, an interpolating block, a control block and an information input control block, as well as a task block for S time connected between the intergroup block and the interpolating block, the outputs of the control block are connected to the BTOtHJM inputs the input unit and the PSI unit, respectively, the output of the intr0p polishing unit is connected to the control unit of the actuators 4. The main disadvantage of this device is the small swiftness due to the limited input speed of the input unit. In CNC devices, information is read from the carrier and entered into the memory block in frames. At the end of the input of each frame, the input block is stopped, and after the interpolation block of the previous frame is completed, the next frame is entered into the memory block. The total input time of one frame with the help of a modern input unit is 0.1-0.05 s and it is the sum of the response time of the start-stop mechanism and the time taken to read information from the frame. Linear interpolating unit compared with the input unit has a much higher speed. Such a mismatch between the speed characteristics of the input block and the interpolator block leads to the underuse of the interpolator in the CNC devices. At the same time, the stressful mode of operation of the start-stop mechanism when entering frames with a short working time (frames containing information about corrective movement and movement along an elementary section of a trajectory with a small radius of curvature) drastically reduces the reliability of the input unit and the CNC unit as a whole. is to increase the speed and reliability of the device. The goal is achieved by the fact that a counter, an OR element and a command driver, the first input of which is connected to the device containing the control unit and the serially connected program input block, program control block, buffer memory block, interpolator and executive mechanism the second output of the program control unit and the first input of the OR element; the second input - with the BTopbiM output of the interpolator and the second input of the OR element, and the output - with the inhibiting input of the input program module, connected by the trigger input via a control unit to the second input of the buffer memory unit and to the output of the counter, the input of which is connected to the output of the OR element. The drawing shows a diagram of the proposed device. The device contains a program input block 1, a program control block 2, a buffer memory block 3, an interpolator 4, an actuator 5, a control block 6 (information input), a command generator 7, an OR element 8 and a counter 9. The device works as follows . The signal from the output of counter 9 overwrites the information of the nth frame from block 3 into the working memory of interpolator 4, and also through block b turns on block 1, Interpolator 4 starts converting the recorded information to the working memory into a sequence of command pulses from its output, it enters the input of the mechanism 5. At the same time, 1, through block 2, enters into the cleared cells of block 3 information. contained in the 4n + 1) th frame of the program. The end of frame code read from the program carrier comes from the output of block 2 to the inputs of the imaging unit 7 and the element OR 8. The last command pulse from the second output of the interpolator 4 is in the form of a signal the end of the testing is fed to the inputs of the imaging technology 7 and the element OR 8.. The signals of the frame end and the end of testing through the element OR 8 arrive at the input of counter 9, which, regardless of the order of their arrival, generates a signal at the inputs of blocks 3 and 6. If the signal at the end of the frame comes before the signal of the end of testing, the driver 7 generates a stop of the input block, on which block 1 will stop reading information from the carrier until the next signal from the output of counter 9 arrives. With a pre-emptive signal, the end of testing or when both signals are received simultaneously, the former 7 does not generate a stop signal the input unit (the signal end of testing takes precedence) and continuous information is read from the carrier, i.e. block1 works in henpefttjbhom mode. At the same time, the output signal of counter 9 is used only for rewriting information from block 3 to the working memory of interpolator 4. Thus, in the proposed device, the time to enter information from punched tape is reduced. Improving the speed, the CNC device is especially important when monitoring and developing control programs on the hardware complex, when monitoring the machined parts on the measuring machines, when, for economic reasons, it is necessary to form the operating modes of the CNC device. At the same time, the machine time of the system for monitoring and processing programs is reduced, and the load factor of high-performance software is also increased by reducing its time just waiting for control programs.

Claims (4)

1. USSR author's certificate No. 327449, cl. G 05 B 19/18, 1970. 2. USSR author's certificate W 408276, cl. G 05 B 19/18, 1971. 3. Authors certificate of the USSR 543921, cl. G 05 B 19/18, 1974. 4. Fedorov S.V. Linear interpolator for CNC systems. - Sat. Drive unit 5 and precise displacement control. M., Science, 1969, p. 129-135 (prototype).