Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
  • G05B19/00—Programme-control systems
  • G05B19/02—Programme-control systems electric
  • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
  • G05B19/416—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control of velocity, acceleration or deceleration
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
  • G05B2219/00—Program-control systems
  • G05B2219/30—Nc systems
  • G05B2219/43—Speed, acceleration, deceleration control ADC
  • G05B2219/43203—Limitation of speed, permissible, allowable, maximum speed
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
  • G05B2219/00—Program-control systems
  • G05B2219/30—Nc systems
  • G05B2219/49—Nc machine tool, till multiple
  • G05B2219/49164—Corner, making corner

Definitions

• the present invention relates to a teaching value control method], and particularly relates to a numerical control method capable of reducing a processing error in cutting of a corner portion and a processing error in a radial direction in arc cutting within an allowable range.
• Prefetching method of this data pre-read the next NC data flop log click beta 2 in NC machining control by ⁇ rather Genbu b click click and example, if the first block shown in FIG. 1, the current ' in parallel with the NC machining control that by the block can you have one line pre-processing of the next pro-click-click B 2, that due to the developing Bro-flops click Bi NC machining control end at the same time to the pre-processed NC on the basis of the following NC data of Bro ⁇ click B 2
• the acceleration speed characteristic of a finger-train function is used due to the delay of the servo system! 2
• the actual path is the command path, and the point is the tool path.
• the difference between the tool path and the command path depends on these parameters.
• the difference between the tool path and the command path 0 is required to be within the machining error and the allowable error. For this reason, the feed speed has been determined while taking into account the processing error when creating the NC tape.] Or due to the dwell between the command data applied to the blocks before and after the corner. (G04) command and stop for the crawl time: ⁇
• the device was devised and programming was performed. ⁇
• Numerical control processing is performed on the basis of data from multiple command data, and numerical control based on one command data is performed.
• the upper limit feed speed is calculated based on the shape of the processing commanded by the additional program and the allowable processing error.
• a numerical control method for delaying the start of pulse division calculation based on data is disclosed. According to the present invention, even if an NC tape is created without taking into account machining errors caused by the delay of the servo system in corner cutting and arc cutting, the feed is automatically limited. In addition, the machining time exceeds the tolerance due to the addition of the pulse of the next block or the time of the next block E. Therefore, the preparation of NC tapes is extremely simple, and the ⁇ The table length is short because it is necessary to use an instruction such as an el G04. Furthermore, there is no need to create NC tapes for machine tools.
• Fig. 1 is a diagram for explaining data reading
• Figs. 2 and 3 are diagrams for explaining machining errors in corner machining and circular cutting
• FIG. 4 is an explanatory view of the tool path at the corner part
• Fig. 5 is a diagram of the machining error in the radial direction in the case of arc cutting
• Fig. 6 is a block diagram of an actual example of the present invention
• Figs. 7 and 8 FIG. 7 is another explanatory diagram of the present invention.
• FIG. 7 is an explanatory diagram of the relationship between the delay time and the processing error when the pulse writing time of the next block is delayed
• FIG. 4 is an explanatory diagram illustrating a tool passage at a corner portion. Now, the feed speed V is constant after the corner PCN]) and by pre-reading]) command data is read, and the corner is
• Vy l V.sk Pi
• Vy 3 ⁇ 4 V. Sin 2 ic — ⁇ ⁇ —) ⁇ & UREA
• Fig. 5 is an explanatory diagram explaining the radial error in the case of arc cutting.
• the actual path is the command path
• the dot is the actual path of the tool.
• the NC unit accelerates and deviates the command speed exponentially in order to smoothly accelerate and decelerate.
• the output follows the command in a first-order lag system.
• ⁇ ir is the maximum value of the radial error ( ⁇ ), Send V]? Speed ( ⁇ / sec), r is the radius of the arc),
• T is the time constant of the DC motor
• T 2 is the time constant of the DC motor
• FIG. 5 is a block diagram for realizing the numerical control method of the present invention.
• 101 is the NC tape on which the NC command data is recorded
• 102 is the control unit.
• 'NC data is transmitted from the NC tape 101 via the tape reader 102 i.
• the read NC data is decoded by the decoding unit 102a. If the NC data is, for example, an M, S, T function command, etc., this is shown on the machine side via a large power board. And if the NC data is tight road data, perform preprocessing in the processing unit 102b.
• the processing unit 10 2c is the difference between the command position data Xc, Yc, Zc and the current axis position data Xa, Ya, Za stored in the data memory 102d (incremental ⁇ , ⁇ , and ⁇ are calculated by the following equation.
• the difference is output to the pulse distributor 103 and the difference is output.
• ⁇ ⁇ , ⁇ are stored in data memory 1 C3 2 d in the remaining movement amount storage area.
• the remaining movement amount that is,
• the processing unit 1 0 2 c is distributed Pulse ⁇ of each axis from Pulse partial Symbol device 1 03, ⁇ , each ⁇ to live
• Xa + ⁇ X- ⁇ Xa, Ya + ⁇ Y ⁇ Ya, Za + ⁇ ⁇ Za-(9) is calculated to update the current position of the data memory 102d.
• the control unit 102 also has a flib * fob 102 e and a comparison selection circuit 102 * a flib 'flob 102 e is a direct line. It is recorded whether the mode is in the circular interpolation mode or in the circular interpolation mode. If the function instruction (G01) is specified between the circumferences, it will be reset and the circular interpolation function instruction (& 02 or If 0 "03) is commanded, the signal is reset, and a signal LCI is output from the output terminal on the side of the line indicating whether the mode is in linear interpolation mode or arc mode.
• the comparison and selection circuit 102f is currently in the circular interpolation mode (the signal LCI-one, the command speed Vi and the upper limit speed Vc for circular cutting are compared with each other,
• Lapa v and outputs the c, that is, Vi is VL, v-out c'm i> have size bet is click the lamp to VL or Vc
• 1 03 is Pulse minute Symbol device der Lee down click Li menu
• a known pulse distribution operation is performed based on the values ⁇ , AY, and Z to generate distribution pulses Xp, Yp, and ⁇ corresponding to the speed output from the comparison and selection circuit MU. Then, 104 accelerates the pulse speed of the distributed pulse sequence ⁇ exponentially when the pulse system! I occurs, and exponentially decays at the end of the pulse sequence.
• a known decay speed circuit that generates a pulse train ⁇ ⁇ at a high speed.
• 105 is a direct current that drives a table TB or a tool.
• the motor is 10 mm, and each time the DC motor revolves for a predetermined amount, one feeder is used. , for example the other is by J? configuration to reversible mosquito window pointer, the difference ⁇ of s number and the non-I over-dopa grayed-click Pulse Pf of input Pulse P x generated from the pressurized ⁇ circuit 1 04 serial Billion ⁇ ⁇ , this error calculation part is as shown in the figure! ⁇ And to ⁇ the difference E of Pi 'but it may also be constituted by an arithmetic circuit 107a and the error-les-Soo data 1 07b to the error E to serial billion.
• the error calculating SL billion parts 1 07 DC motors 105 + direction of Tosureba input Pulse Ru rotated 0 P x is generated in the per-to ⁇ Pa ls e: Ca a P x U Every time the 7th feedback pulse Pf is generated, the contents are down-loaded, and the number of input pulses and the number of feedback pulses are counted.
• the difference E is stored in the error register 1Q7b.
• 1Q8 is a converter that generates an analog voltage proportional to the content of the error register 10, and 109 is a speed control circuit.
• the upper limit speeds VL and Vc for straight and circular cutting are calculated in advance and input to the registers BGj.
• the command speed Vi included in the path_command is decoded by the de-Q coder 102a and compared and selected.
• a signal indicating the linear mode or the circular interpolation mode: LCI is input to the multi-plexer of the offset selection circuit 102. ⁇ This multiplexer and the multi-plexer are the signals.
• the ⁇ comparator CMU which outputs either V L or V c according to LCI * 1,, ⁇ 0,
• OMPI Alternatively, a magnitude comparison with V C is performed and a small speed is input to the pulse divider 103. At the same time, the processing unit 102c calculates the incremental value AX, ⁇ , by executing the function of the expression (7), and pulsates the incremental value.
• the pulse distribution is executed based on the velocity data from the comparison unit CMU, and the divided pulses ⁇ , ⁇ , ⁇ are output.
• Pressurized ⁇ circuit 1 04 is input to the distribution Pulse ⁇ this, its Pulse speed to rise? Time acceleration, falling]? Time deceleration error calculation Symbol billion a command Pulse train Input to the unit 1 Q7, the content of the error register 107b is not zero. Therefore, a voltage is output from the converter 1 Q8, and the command pulse P x is supplied to the error register 1 Q7b.
• the difference E between the number of feedback pulses and the number of feedback pulses Pf is stored, and the servo control is performed so that the difference E becomes zero after &.
• the TB moves toward the target position or moves along the command path at the speed output from the comparative part, and stops. * From the above, move the moving parts such as the table and tool below the specified speed. The machining error does not exceed the permissible error in corner cutting and arc cutting.
• the timing to reduce the speed in (a) monitors the remaining movement amount, and when the remaining movement amount is less than a predetermined value, reduces the speed. In this case, monitor the amount of movement of the 1st corner and reduce the speed until the amount of movement is above a specified value.
• FIG. 7 is a diagram illustrating the method of measurement.
• Front and rear block Bi of the corner CP, B 2 is I orthogonally cross at the corner CP, pre pro full phrase der parallel to the X axis * rear blogs Kuo, is parallel to the Y axis c
• the cutting speed g when cutting the front block Bi will be the command speed Vi near the corner as shown in Fig. 7 if the servo system has primary characteristics. manner that, this and can ⁇ , the based Kupa ls e min distribution operation to the command data of the rear block B 2, the FIG. 7 prior Remind as in (c) profile click click Bi ⁇ Quick start time t e J? To start (solid line), after the block speed is completed, "yo"? To start (single-dot chain), or to the time between t e and t 2 ]? The processing difference changes according to (dot ⁇ )
• FIG. 8 is a block diagram for realizing the above method.
• the same parts as in FIG. 8 are denoted by the same reference numerals, and a detailed description thereof will be omitted.
• Fig. 8 and Fig. 8 The difference between Fig. 8 and Fig. 8 is that the pulse distribution start time of the next block is delayed according to the machining error and the tolerance determined from Eqs. (5) and ( ⁇ ). in it, i.e. the point, the control unit 1 02 and (S) or (6) a machining error E r is calculated from the equation, and the machining error E gamma calculates a difference between the ⁇ processor 1 0 2 c , tape b le 102 g and, Contact and have a Thailand Ma 102h] 5, Pulse min after response Ji delays ⁇ in error for storing a correspondence between the error and Pulse content distribution start delay time Start signal PDS is timer 1 G2li] 3 Pulse distributor
• the pulse distribution start signal PDS is input to the pulse distributor 103, and the pulse distribution is performed based on the already input command data of the next cycle. 10S to start the pulse distribution operation.
• the pulse distribution start delay time is zero
• NC tables 15 and it is extremely easy to make NC tables.] Moreover, the length of the table is short due to the necessity of using a dwell G04 and other instructions. In addition, NC tapes must be used according to the machine tool. create

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• Engineering & Computer Science (AREA)
• Human Computer Interaction (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Numerical Control (AREA)

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Citations (3)

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• 1981
  • 1981-08-27 JP JP56134774A patent/JPS5835607A/ja active Granted
• 1982
  • 1982-08-27 EP EP82902548A patent/EP0086846B1/en not_active Expired
  • 1982-08-27 WO PCT/JP1982/000343 patent/WO1983000755A1/ja active IP Right Grant
  • 1982-08-27 US US06/491,333 patent/US4543625A/en not_active Expired - Lifetime
  • 1982-08-27 DE DE8282902548T patent/DE3279993D1/de not_active Expired

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