JPS6145245B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a numerical control device for controlling the grinding process of a workpiece, and its purpose is to grind the workpiece by simply writing numerical data such as feed speed and feed amount into a predetermined storage area as control parameters. The purpose of the present invention is to facilitate the writing of control parameters by making it possible to carry out grinding operations, and to preset standard values of control parameters in the storage area. Generally, when grinding a workpiece, various types of grinding such as flange sizing cut grinding, traverse dead stop grinding, etc. Workpieces are machined depending on the grinding method, but these grinding methods can be classified into several patterns, so the idea of fixed cycles, which is adopted in some conventional numerical control devices, is used. If numerical control is performed using this method, it becomes easier to create numerical control programs. However, even if such a canned cycle method is used, the control parameters necessary for the canned cycle, such as numerical data such as feed rate, feed amount, and spark-out time in the case of grinding, must be written in by the operator one by one. It is troublesome to write control parameters. In particular, when controlling grinding, the control parameters that the operator must input differ depending on the grinding method, and
Since the number of control parameters that must be input is large, writing the control parameters requires a great deal of effort and time. By the way, in general grinding, even if the workpiece or surface to be machined changes, there is often no need to change the feed rate, number of sparkouts, etc. in each process of coarse grinding, fine grinding, and fine grinding. Up,
When a single workpiece has many machined surfaces, pre-machining is performed so that the grinding allowance for each machined surface is constant, so the feed amount in each process is also the same regardless of each machined surface. There are many cases. For this reason,
In grinding operations, the same control parameters can be used for multiple machining surfaces or multiple workpieces. The present invention has been made in view of these points, and enables grinding of a workpiece simply by writing numerical data such as feed rate and feed amount as control parameters into a predetermined storage area. When writing control parameters with standard values stored in another storage area, transfer the standard values of the control parameters to the predetermined storage area, and then write one of the transferred control parameters. The control parameters are written by modifying the section or by additionally writing a few control parameters that are not stored as standard values. Embodiments of the present invention will be described below based on the drawings. In Figure 1, 10 is the bed of the grinding machine,
A table 11 is placed in front of the bed 10 so as to be movable in the left-right direction (Y-axis direction), and a pulse motor 12 is attached to the side of the bed 10.
It is adapted to be moved in the Y-axis direction by. On this table 11 is a headstock 15 on which a main shaft 14 rotatably driven by a motor 13 is mounted.
A tailstock 17 that supports the tailstock center 16 is placed thereon, and a spindle center 18 and a drive pin 19 are fixed to the spindle 14 . A multi-stage workpiece W having a plurality of machining surfaces is held between the spindle center 18 and the tailstock center 16, and is engaged with the drive pin 19. On the other hand, behind the bed 10, a grindstone head 22 that supports a grinding wheel 21 rotatably driven by a grinding wheel driving motor 20 is arranged so that it can move in a direction perpendicular to the axis of the workpiece W (X-axis direction). The bed 10 is guided by a pulse motor 23 fixed to the rear of the bed 10 and is moved by a hydraulic cylinder (not shown). The pulse motors 12 and 23 are connected to pulse motor drive circuits 25 and 26, respectively, to which command pulses are given from a pulse generation circuit 24. When command pulses are given to the pulse motor drive circuits 25 and 26, the pulse motors 12 and 23 operate according to the number of command pulses. The grindstone head 22 and slide table 11 are moved. As a result, the relative position between the grindstone head 22 and the table 11 is changed, and the workpiece W is ground. On the side surface of the tailstock 17 on the grindstone side, there is a dresser 27 for adjusting the grindstone. The grinding wheel 21 is fixed in place, and the grinding wheel 21 can be corrected by changing the relative position of the grinding wheel head 22 and table 11. In addition, at a position on the bed 10 that faces the grinding wheel 21 while holding the workpiece W, the dimensions of the workpiece processing surface are measured.
A sizing device 28 is provided which sends a sizing signal when the dimension of the machined surface reaches a predetermined size, and is moved forward and backward by a hydraulic cylinder (not shown). In this embodiment, when the dimensions of the machined surface reach the dimensions of completion of rough grinding, the sizing signal AS1 is output, and when the dimensions of the machined surface reach the dimensions of completion of fine grinding and the dimensions of finishing, sizing signals AS2 and AS3 are output, respectively. things are used. A central processing unit 30 constitutes a numerical control device together with the pulse generation circuit 24 and the data writing device 31. It is composed of a small processing unit such as a microprocessor, and has a memory M, an address bus MAB, Connected via data bus MDB. In addition to the pulse generation circuit 24 and the data writing device 31, the central processing unit 30 includes a high-power interface 32 for exchanging signals with a high-power circuit, and a grindstone head 22 and a table 1 that can be manually operated.
An operation panel circuit 33 equipped with operation switches and the like for moving the controller 1 is connected via a data bus DB and an ad bus AB. Figure 2 shows the address map of the central processing unit 30. Addresses 1 to E000 (in hexadecimal) are allocated to addresses in memory M, and addresses from E001 to
Addresses up to E800 are allocated to input/output element addresses. The storage area from address 1 to address E000 stores a control program for machining a workpiece using a specified grinding method, an MDI program for writing control data in accordance with commands from the data writing device 31, etc. a program storage area;
a data storage area for storing temporary data;
It is broadly divided into a parameter storage area that stores control parameters for machining a workpiece using a specified grinding method, and the program storage area that does not require rewriting is comprised of non-volatile semiconductor memory PROM and requires rewriting. The parameter storage area consists of core memory. Further, a data storage area for storing temporary data is constituted by a volatile semiconductor memory RAM. As shown in Figure 3, the parameter storage area consisting of the core memory is provided with 30 sets of stack tables, and each of these stack tables stores the grinding method and the control parameters necessary for this grinding method. I'm starting to remember it. In this embodiment, control data for three different multi-stage workpieces are stored in this stack table, and up to 10 sets of grinding methods and control parameters can be stored for one workpiece. can. Therefore, as long as the workpiece has 10 or less machined surfaces, it is possible to machine a workpiece having any number of machined surfaces. Note that the control program storage area also stores an automatic operation program for fully automatically machining a multi-stage workpiece by reading out a grinding method and control parameters according to the machining surface of the workpiece. As shown in FIG. 4, data representing the grinding method is stored at address 2, which is the third data area of the stack table, and control parameters are stored after address 3. Note that addresses 0 and 1 serve as control flags used to determine whether or not the stack area stores parameters. The data writing device 31 is a device that writes the grinding method and control parameters to this stack table.
The figure shows an example of the operation panel. The operation panel is not only provided with numerical keys 50 and command keys 51 for writing the grinding method and control parameters, but also allows writing of control parameters necessary for the written grinding method on the numerical control device side. Indicator lamp L100 consisting of a light emitting diode to request from
~L410 is provided. In addition, the operation panel is provided with six display windows, and behind these display windows are numerical displays 52 to 57 with an appropriate number of digits.
is installed. This not only displays the current positions of the grindstone head and table, but also displays the grinding method, control parameters, and the like. In addition, SW1
0 indicates a switch that specifies the type of workpiece,
When programming three types of workpieces, the switch SW10 is sequentially switched to write data. The numeric keys 50 are connected to a numeric key encoder 70 as shown in FIG. 7, and when a numeric key from 0 to 9 is pressed, code data CD and trigger signal KTS are generated according to the pressed numeric key. is output from the numerical key encoder 70. The code data CD output from the numerical key encoder 70 is
The least significant digit DP of the six display units DP10 to DP15 forming the numerical display 52 that displays the written data
15 input terminal, and the trigger signal KTS is given to the shift control circuit 71. Each of the six display units DP10 to DP15 is a combination of a data latch circuit, a decode circuit, a drive circuit, a display circuit, and a display, and has an output terminal for outputting latched data. There is. 6 display units DP10 to display written data
In DP15, the data output from the lower digit output terminal is serially connected to the upper digit input terminal, and the data output from the output terminal is
It is connected to data input buses DIφ to DI15 via gate buffers GB1 and GB2 having input/output addresses of addresses E030 and EO32. Furthermore, when the shift control circuit 71 is given the trigger signal KTS, it sequentially outputs pulses one by one from the output terminal 1 to the output terminal 6 in synchronization with the pulses output from the oscillator OSC. It is designed to be applied to the latch terminals of display units DP10 to DP15. Therefore, when the numerical key 50 is pressed, the pressed numerical value is displayed on the display unit DP15 of the lowest digit, and the numerical value of the lowest digit is shifted to the next higher digit.
Each time the numeric key 50 is pressed, the entered numeric value is sequentially shifted to higher digits, and the data entered by the numeric key is displayed. Further, address data specifying input/output addresses EO30 and EO32 is output from the central processing unit 30, and a data input signal is output.
When DIN is sent out, gate buffers GB1 and GB2
is opened and the data displayed on the display units DP10 to DP15 is read by the central processing unit 30. Note that 72 indicates a decoder that decodes address data output from the central processing unit 30, and 73 indicates input/output data buses DIφ to DI1.
5. A bidirectional buffer connecting DOφ to DO15 and data paths Dφ to D15 of the central processing unit 30 is shown. On the other hand, the command key 51 is controlled by the command key encoder 74.
A code corresponding to the pressed command is output from the command key encoder 74,
Input data buses DIφ to DI15 are connected via gate buffer GB3 having an input/output address of address EO20.
is output to. Further, when the command key 51 is pressed, a trigger signal is sent from the command key encoder 74.
CTS is output and given to the central processing unit 30 as an interrupt signal INT8. central processing unit 30
When interrupted by this interrupt signal INT8, data representing the grinding method and control parameters set by the numerical keys 50 are stored in a predetermined stack table. Also,
The signal sent from the changeover switch SW10 is also applied to the central processing unit 30 via the gate buffer GB3. Furthermore, a numerical display 53 that displays current data
display units DP20 to DP25, numerical displays 54 and 55 that display the grinding order and grinding method;
Display units DP30 to DP33 forming
6,57 display units DP40 to 46, DP
The input/output addresses EO22 to EO2E are assigned to 50 to 55, and when these addresses are designated by the central processing unit 30 and the write signal WE is output, the output data is displayed on the designated display unit. The data of buses DOφ to DO15 are taken in and displayed. In addition, the display lamps L100 to L410 that request writing of control parameters and the display lamps L10 to L22 that display the operating status, etc.
Input/output address EO20 and EO34~EO3C
The central processing unit 30 controls the blinking of the light. FIG. 6 shows an example of an operation panel connected to the operation panel circuit 33, which is provided with an operation mode changeover switch, a manual pulse generator MPG, a start switch, and the like.
The switches attached to this operation panel are monitored by a basic routine (not shown) that is periodically executed by the interrupt signal INT3 generated every 10 mS from the RTC generation circuit 34. When the operation mode switch is switched to the MDI position, an interrupt signal INT from the data writing device 31 is output.
8 and executes the routine MDI for data writing, and when the operation mode is switched to automatic, the automatic operation program AUTO is executed. Also, when the manual pulse generator MPG is rotated, the interrupt signal INT6 or
INT7 is given to the central processing unit 30 for manual feeding. The pulse generation circuit 24 in FIG. 1 outputs the number of pulses designated by the central processing unit 30 to the pulse motor drive circuits 25 and 26 during automatic feed or manual feed operation. The circuit configuration is as shown. Data representing the movement direction, data representing the oscillation period and frequency division ratio, and data representing the movement amount are provided from the central processing unit 30 via the data buffer DB, and these data are respectively input to and output from addresses EO00 and EO00.
It is latched into buffer registers BR20 to BR22 having addresses EO06 and EO04. Also,
When the address EO02 is specified, a signal is applied to the load terminal LOAD of the preset counter 80. The data representing the cycle of the data latched in the buffer register BR20 is sent to the AD converter 81.
is converted into an analog signal by VF converter 8.
given to 2. As a result, the VF converter 82 outputs pulses at the specified period, and these pulses are supplied to the frequency dividing circuit 83. The frequency dividing circuit 83 divides the pulse into 1/10 or 1/100 or directly outputs the pulse, depending on the data representing the frequency division ratio of the data latched in the buffer register BR21. The pulse output from the frequency dividing circuit 83 is applied to a gate circuit 84 and a subtraction terminal DOWN of the preset counter 80. The gate circuit 84 switches the gate according to the data representing the movement direction latched in the buffer register BR20, and supplies a pulse to either the forward rotation terminal or the reverse rotation terminal of the pulse motor drive circuit 25 or 26. On the other hand, the preset counter 80 uses the amount of movement set in the buffer register BR22 as its initial value, and subtracts this initial value using the distribution pulse. When the counted value reaches zero, this is detected as zero. zero detection circuit 85
A distribution completion signal CONDEN is output from. This signal CONDEN is an interrupt signal to the central processing unit 30.
It is given as INT2 to request the data for the next pulse distribution, and is also given as a load signal to the preset counter 80, and is sent to the buffer register BR22 by the central processing unit 30 during pulse distribution.
The amount of movement set in the preset counter 80
It is now loaded into . Next, operations at the time of writing control data and during automatic operation, and the operation of the central processing unit 30 will be explained based on a flowchart. If you want to write control data now, after switching the operation mode switch on the operation panel to the MDI position, move switch SW10 on the operation panel of data writing device 31 to the workpiece to which data is to be written. After that, control data is written in the following order using the numerical keys 50 and command keys 51 according to the numbers. 1 Writing the grinding order The grinding order is input to identify which machined surface among the many machined surfaces provided on one workpiece, data is being written. If it is a machined surface, press the command key for grinding order, then press the numeric key 1, and then press the command key for writing. Also, when entering data for the second and subsequent machining surfaces, the lamp L100 provided before the grinding order will light up, so press the numerical key corresponding to the number of the machining surface and enter the data. Press the command key. When the command key for the grinding order is pressed, the command key decoder 74 of the data writing device 31 outputs a trigger signal CTS, and the central processing unit 30 is given an interrupt signal INT8. As a result, the central processing unit 30 reads and executes the MDI routine program shown in FIG. The first step 110 of the MDI routine is to determine whether the pressed command key is a grinding order key using the command key encoder 7.
4, and if it is determined that the pressed key is for the grinding order,
Proceeding to step 111, the MDI flag is set and the count value of the MDI counter is set to -2.
Note that the MDI counter controls the writing step of control data, and the count value of the MDI counter is -
When the count is 2, it indicates that the step is to input data on the grinding order, and when the count value is -1, it indicates that the step is to input the data on the number of processing stages. Also, when the count value of the MDI counter becomes positive,
It is used to specify the order of columns in the MDI table shown in FIG. 12 and to request writing of control parameters according to the set grinding method. After this, at step 112, data in which bit 0 is "1" and other bits are "0" is transferred to buffer register BR12 at address EO36, and lamp L1 is transferred to buffer register BR12 at address EO36.
00 lights up and returns to the main routine. Next, when a numerical key is pressed, it is displayed on the display unit DP15 for displaying written data, and the operator is informed of the input grinding sequence number. When the write command key is subsequently pressed, the central processing unit 30 is interrupted again and the MDI routine is executed again. At this time, since the MDI flag is set, this is determined in step 113, and the process proceeds to step 114.Step 114 is a step to determine whether the pressed command key is a write command key. When it is determined that the write operation has been performed, the program jumps to the write processing routine WRITE shown in FIG. 10, and the write processing is performed. In the first four steps of the write processing routine WRITE, steps 130 to 133, it is determined what data is written based on the contents of the MDI counter, and steps 134 and 133 are performed according to the contents of the MDI counter. 149, 151, 156,
160. In this case
Since the MDI counter is -2, step 1
The routine moves on to the routine after 34. Step 134
The data displayed by the display unit DP15 is read into the display unit DP15, and the process proceeds to step 135.
When this happens, the workpiece number set by switch SW10 is read. And step 1
At step 36, a stack table for storing the grinding method and control parameters is selected from the parameter storage area using the workpiece number and grinding order data, and at step 137, the grinding order is displayed on the display units DP30, 31 for displaying the grinding order. do. For example, if the workpiece number is 1, the grinding order is 1, so in step 136 the first stack table among the 30 stack tables is selected. At step 138, it is determined whether the grinding order is between 1 and 10. If it is between 1 and 10, the process moves to step 139; otherwise, the process moves to step 145. In this case, since the grinding order is 1, the process moves to step 139, and the write pointer is set at address 2 of the selected stack table. Further, in step 140, it is determined whether the grinding order is 1, and if the grinding order is 1, the count value of the MDI counter is set to -1 in step 141, and in step 142, the previously programmed workpiece is Display unit DP20~ for displaying current data, with the number of machining surfaces as the number of machining stages.
Display on DP25 and turn on lamp L1 at step 143.
01 is lit and returns to the main routine. Note that the number of processing stages is determined by counting the number of stack tables in which "1" is written in address 1 of the stack tables. 2 Writing the number of machining stages Since the lamp L101 is turned on in step 143, the operator inputs the data of the number of machining stages.
For example, if the number of machining stages is three, input 3 using the numerical keys, and then press the write command key. In this case, the write key is also pressed, so
The write processing routine WRITE program shown in FIG. 10 is executed. Then, based on the count value of the MDI counter, it is determined that the data input using the numeric key is the data of the number of stages, and the process moves to step 149. At step 149, the set number of stages is displayed on the current data display units DP20 to DP25.
At the same time, 1 is written in the 1st address of the number of stack tables corresponding to the set number of stages, and the 2nd and subsequent addresses of these stacks are cleared in preparation for writing the grinding method and control parameters. Then, in step 150, set the MDI counter to 0.
After that, return to the main routine. 3 Writing of Grinding Method In this embodiment, the grinding method and control parameters are written in order according to instructions from the central processing unit 30. When the operator presses the command key for the next step, the lamp L1 on the operation panel will light up.
One of the lamps 00 to L410 is lit, and the operator writes the data specified by the lit lamp. In order to perform such control, the central processing unit 3
In the storage area of PROM 0, there is a lamp address table showing which bit position of which input/output address the lamp corresponding to the type of control parameter is connected to, as shown in FIG.
As shown in FIG. 2, an MDI table is provided in which the control parameters necessary for each grinding method are stored using the table number of the lamp address table. The lamp address table also stores data indicating a data store position in order to determine where in the stack table data entered using the numerical keys should be stored. In addition, when writing the grinding method, the 11th
Only the lamp address table shown in the figure is used. When the command key for the next step is pressed, the central processing unit 30 determines this at step 117 in FIG. 9 and proceeds to step 118. In step 118
Determine whether or not the MDI counter is zero. If it is not zero, proceed directly to step 121. If it is zero, read the grinding method data written in the stack table in steps 119 and 120, and After outputting to the display units DP32 and DP33, the process advances to step 121. In this case, zero is displayed because the stack table has been cleared. After this, the MD1 counter is incremented by 1 in step 121, and it is determined in step 122 whether the counted value is 1. If the counted value is 1, step 1 is executed.
If the value is not 1, the process proceeds to step 123. In this case, since the count value of the MDI counter is 1, the process advances to step 129. Step 129
Now, 0 in the lamp address table shown in Figure 11.
The process searches for the table numbered and proceeds to step 126.
At step 126, the lamp address and bit position data stored in table 0 are read out, and the bit position data is output to the input/output address read out at step 127 to light the lamp L102. This instructs the operator to input data on the grinding method. The operator follows this and inputs the data of the grinding method using the numeric keys, and then presses the write command key. In the case of this embodiment, eight types of grinding methods as shown in Table 1 can be specified, and the optimum grinding method for the machined surface is set.

[Table] For example, if plunge constant feed grinding is optimal for grinding surface 1, press the number key 1 and then press the write key. When the write command key is pressed, this is determined in step 114, and the process jumps to the write routine WRITE shown in FIG. 10. Since the count value of the MDI counter is 1, the written data is It is determined that the data is based on the system, and the process advances to step 151. At step 151, the grinding method data entered using the numerical keys is read from the display units DP10 to D15, and step 152
It is determined whether the grinding method read in is either 11 or 12. In this case, since the grinding method is 1, the process moves to step 154 and the read grinding method is displayed on the display unit for displaying the grinding method.
Then, in step 155, the read grinding method data is written to address 2 of the selected stack table, and the process returns to the main routine. 4 Writing of control parameters Writing of control parameters is also performed by pressing the command key for the next step the same number of times as writing for the grinding method. When the next step command key is pressed,
As in the previous case, this is determined in step 117, and since the count value of the MDI counter is 1, the process moves from step 118 to step 121, where the MDI counter is incremented to make the count value 2. Thereafter, the process proceeds to step 122, where it is determined whether the count value of the MDI counter is 1. In this case, since the count value is 2, the process proceeds to step 123. At step 123, the grinding method and grinding method set by referring to the lamp address table shown in FIG.
A table number is selected from the count value of the MDI counter. Then, it is determined whether the table is at the end depending on whether the data read in step 124 is -1, and if the data is -1, the process jumps to step 111.
After setting the MDI counter to -2 in step 1, the lamp L100 is turned on in step 112. on the other hand,
If the data is not -1, the process moves to step 126, and the lamp address and bit position data of the table of the read number are read out. In this case, the grinding method is 1 and the count value of the MDI counter is 2.
Therefore, in step 123, the
1 as table number data from MDI table
is read out, and in step 126, lamp address data EO36 and bit position data 3 stored in the first lamp address table of FIG. 11 are read out. After this, step 1
27, data in which only the third bit is "1" is transferred to address EO36, thereby lighting lamp L103. Also, step 128
Then, data stored in 3 bytes is read from address 3 of the stack table and displayed on display units DP20 to DP25 for displaying data. In this case, zero is displayed because the stack table has been cleared. The operator can determine by the lighting of the lamp L103 that the next control parameter that must be input is the data on the position of the grindstone platen, and therefore inputs the data of the position of the grindstone platen using the numeric keys.
After this, press the write command key. In addition, in this embodiment, the data for the grinding wheel table original position is set to a value that is twice the distance between the processing surface of the grinding wheel 21 and the workpiece axis at the rapid feed start point, and the operator Position data can be set in correspondence with the diameter of the workpiece. When the write command key is pressed, this is determined in step 114 and the program jumps to the write routine of FIG. In normal writing of control parameters, all steps are step 133 or step 1.
The process moves from step 61 to step 156. Step 1
When it reaches 56, the data entered using the numeric keys is
The data is stored in a predetermined storage area of the stack table with reference to the data storage position of the lamp address table shown in FIG. Also, in the read step 157, the data written in the stack table is read out again and outputted to the display units DP20 to DP25 for displaying the current data. Since the data entered by the operator using the numeric keys is displayed on the display units DP10 to DP15 for displaying written data, the operator can use the display units DP10 to DP15 for displaying written data and for displaying current data. It can be determined that an abnormality has occurred in the data writing device 31 or the core memory constituting the stack table based on the discrepancy between the display units DP20 and DP25. In this manner, when writing of the data for the grindstone base position is completed, the next step command key is pressed again. As a result, the MDI counter is incremented in step 121, and the lamp for the next control parameter to be input is lit in steps 123, 126, and 127. In this case, the third table number for grinding method 1 shown in the MDI table in Figure 12 is 2, so refer to the lamp address in Figure 11.
The lamp L104 connected to the 4th bit of address EO36 is lit to notify that the next control parameter to be input is the table index position data. Thereby, the operator inputs the data of the table index position using the numerical keys and the write command key. In this embodiment, the table index position is input as an absolute coordinate value with the table original position as the origin so that the table current position data can be directly programmed as table index position data. The indexing operation is also performed based on the input absolute coordinate values. The control parameters are written in the same way in the following order, but if the grinding order is 1 and the grinding method is 1, when the writing of the step of whether or not to correct the grinding wheel after grinding is completed, the next step is to write the control parameters. L200
~ L207 is lit in order to request writing of control parameters for grinding wheel correction, and following this,
The lamps L300 to L308 are turned on in order to request writing of control parameters necessary for plunge grinding. In the case of fixed size grinding, spark out is not performed, so lamp L309 is not lit and writing of the spark out time is not required. In addition, in the case of fixed size grinding, the feed amount for air grinding, coarse grinding, and fine grinding is as follows:
Although it is not used for feed control, it is used to calculate the amount of rapid feed to the air grinding start point and to detect overstroke. When the writing of the control parameters necessary for the set grinding method is completed in this way, -1 is read out as the table number in step 123, so the process moves from step 124 to step 111 and the MDI counter is set to -2. Set, step 11
At step 2, the lamp L100 is turned on and the process returns to the main routine. As a result, the lamp lights up at L308.
The process then moves to L100 indicating the grinding order, and the operator is informed that writing of the control parameters for the first processing surface is completed and that the grinding order data must be input next. 5. Writing data for second and subsequent stages When storing the grinding method and control parameters for the machined surfaces for the second and subsequent stages, the same procedure as in the above case is performed. When writing data from the second stage onward, write 2 as grinding order data corresponding to the position of the machined surface.
After inputting data from 10 to 10 using the numerical keys, press the write command key. This causes the central processing unit 30 to proceed to step 13.
After switching the stack table in step 6, the process branches from step 140 to step 143 to perform MDI.
Set the count value of the counter to zero and proceed to step 1 in Figure 9.
Jump to 21. As a result, the count value of the MDI counter is set to 1, and steps 129, 1
26 and 127, the lamp L102 requesting writing of the grinding method is turned on. Thereafter, when the operator inputs the grinding method using the numerical keys and presses the write key, the new grinding method is displayed on the display units DP32 and DP33. Subsequently, when the command key for the next step is pressed, the first parameter among the control parameters necessary for the new grinding method is searched from the tables shown in FIGS. 11 and 12 in step 123, and thereby, Turn on the lamp.
The operator inputs the control parameters using the numerical keys and presses the write key. The written data is stored in a predetermined storage area of the stack table, and when the command key for the next step is pressed, the lighting position of the lamp changes to instruct the next control parameter to be input. It will be done. Since control parameters related to grindstone correction may be common to each processing surface, the table shown in FIG. 12 is created so that writing of control parameters related to grindstone correction is not required in the second and subsequent stages.
That is, table numbers 6 to 13 in the lamp address table of FIG. 11 are control parameters for grinding wheel correction, and table numbers 6 to 13 are the grinding order in the MDI table of FIG.
Only the grinding method for grinding order 01 is given, and the grinding method for grinding orders 02 to 10 is not given. For example, if the second-stage grinding method is double-sided deep-stop grinding, when the contents of the MDI counter increments from 6 to 7 in the table of FIG. 12, the table number changes from 5 to 24. Therefore, when the writing of the traverse stroke is completed and the next step key is pressed, the lamp L40
0 lights up to request writing of control parameters for traverse grinding. When the writing up to the tally time is completed, the grinding type lamp L100 is lit to notify the completion of writing. 6 Setting and Transferring Standard Parameters In general grinding, even if the workpiece or surface to be machined changes, the control parameters may remain almost the same, and only the amount of grinding needs to be changed.
Therefore, in the numerical control device of this embodiment, an area is prepared in the core memory area for storing standard parameters for grinding wheel correction, plunge grinding, and traverse grinding, and the standard parameters stored in this storage area are A function that allows control parameters to be transferred as control parameters for each machined surface is provided to facilitate writing of control parameters. 6-a Setting of standard parameters When writing standard values of control parameters into the core memory, the grinding order is determined depending on whether the control parameters to be written are related to grinding wheel correction, plunge grinding, or traverse grinding. 20
You can specify ~22. When one of the grinding orders 20 to 22 is set and the write key is pressed, steps 130 and 1 of the write routine WRITE in FIG.
34 to 138 and 145, the grinding order is determined. As a result of this determination, steps 146 to 14
8, the start address of the area for storing the standard conditions for grindstone correction, plunge grinding, or traverse grinding is set to the write pointer. After this, in step 125, the count value of the MDI counter is set to 1, and then the process moves to step 123 in FIG.
Search from the table shown in the figure and proceed to step 12.
At 6,127, the corresponding lamp is turned on. The operator can modify the grinding wheel and set the standard parameters for plunge grinding and traverse grinding by simply specifying grinding orders 20 to 22 in order and writing the parameters specified by the lamp in order as in the previous case. I can do it. 6-b Transfer of standard parameters If you want to transfer the standard control parameters set in the core memory to the stack table as control parameters, when the lamp L103 requesting writing of the grindstone original position is lit, that is, when the grinding After writing the system data and pressing the command key for the next step, you can press the command key repeatedly. When the repeat command key is pressed, this is determined at step 116 of the MDI routine of FIG. 9, and the program jumps to the repeat processing routine SAME shown in FIG. In this iterative processing routine SAME, it is determined in step 170 whether the grinding order is 1, and if the grinding order is 1, step 1 is executed.
Standard parameters for grinding wheel correction are transferred through steps 73 to 175, and if the grinding order is not 1, the process proceeds to step 171 without transfer. Steps 171 and 172 are steps for determining whether standard parameters for plunge grinding or standard parameters for traverse grinding are to be transferred depending on whether the grinding method is 1 or 2 or between 3 and 8. When transferring the standard parameters for plunge grinding, the parameters are transferred in steps 176-178, and when transferring the standard parameters for traverse grinding, the parameters are transferred in steps 180-182. Transfer of each parameter is carried out in the same steps. In the first step, the start address of the standard parameter table is set in the read pointer, and in the next step, the address of the data writing start position of the corresponding stack table is set. Then, in the final step, data transfer and incrementing of the read pointer and write pointer addresses are repeated to transfer standard parameters. 7 Correcting or adding control parameters You can modify the control parameters written manually or the control parameters transferred by the standard parameter transfer described above, or if the control parameters are not stored as standard parameters and are not stored as standard parameters by the standard parameter transfer described above. If you want to additionally write control parameters that are not written, press the next step command key the specified number of times so that the lamp for the control parameter you want to modify or add lights up.
Enter the data to be corrected or added by pressing the numeric keys and the write command key. As a result, the data entered using the numeric keys in the predetermined data area of the stack table searched in the above-mentioned grinding order setting is written in step 156 of the write routine WRITE in FIG. 10, and the data can be corrected or Additions are made. When writing the control parameters by transferring the standard parameters described above, additionally write the control parameters from the grindstone base position to the traverse process, and then write the control parameters that need to be changed among the transferred control parameters. Fix only what is there. Next, the operation when grinding is automatically performed using the control parameters written in this manner will be described. In the numerical control device of this embodiment,
In order to process a workpiece fully automatically, in addition to grinding each machining surface using a different specified grinding method, the table is indexed to a specified indexing position as the machining surface changes. It is designed to control the movement and the movement of grinding wheel correction, and by combining these movements, the workpiece can be machined fully automatically. Furthermore, each of these operations is controlled by a combination of several basic operations (hereinafter referred to as basic operations) such as hydraulic advance of the wheelhead, cutting of the wheelhead, table movement to the right, sizing signal check, etc. The PROM storage area contains many subroutines to perform these basic operations, and the subroutines necessary to perform each operation by combining these subroutines. A sequence table stored in accordance with the order of operations is stored. Figures 14a to 17a show typical operations used in automatic operation, where Figure 14a is table indexing operation for starting automatic operation, Figure 15a is the grinding operation of grinding method 1, and Figure 15a is the grinding operation of grinding method 1. FIG. 16a shows the table indexing operation, and FIG. 17a shows the grinding operation of grinding method 4. Further, sequence tables for performing these operations are shown in FIGS. 14b to 17b. In each sequence table, the number of the next step to be performed is written in addition to the number of the subroutine for executing the basic operation. Also,
When determining whether a sizing signal is on or off or determining the number of traverses in a subroutine that performs basic operations, the jump destination step number when the condition is met and the jump destination step number when the condition is not met are They are written in the next step number column and jump destination step number column, respectively. In addition to the data shown in the figure, parameters used in the subroutines are added to these sequence tables. For example, if the subroutine is a feed routine, the address data of the area where the feed amount and feed rate are stored is added, and if the subroutine is a routine that turns on and off a solenoid, the input/output address and bits of the solenoid to be turned on and off are added. Position data is added as a parameter. When the driving mode is switched to automatic, the central processing unit 30 executes the automatic driving routine shown in FIG.
The AUTO program is executed every 10 mS in synchronization with the interrupt signal INT3 sent from the RTC generation circuit 34, and the workpiece is automatically machined by combining multiple operations consisting of the combination of basic operations as described above. . First step 2 of automatic driving routine AUTO
In step 08, it is tested whether the automatic driving flag AUTF is 1, and it is determined whether automatic driving has started. If it is not 1, go to step 209 and test whether the start switch is pressed. If the start switch is pressed, go to step 21.
Set the automatic operation flag AUTF to 1 at 0,
At step 211, the AUT counter is set to -1 and the process returns to the main routine. Step 212
is a step to test whether the pulse distribution completion flag DEN is set and in the state of 1. If it is not 1, the program returns to the main routine without performing any processing, and if it is 1, it returns to step 213.
, and tests whether the AUT counter is -1. If it is -1, in step 214, the sequence table for automatic operation start table indexing operation shown in FIG. 14b is searched, and in step 215,
Set AUT counter to +1. Then, in step 216, the sequence counter SEQ counter for reading the subroutine number is reset to zero, and then in step 217, the subroutine number stored in the location specified by the SEQ counter in the sequence table is read out. At the start of automatic operation, subroutine number 4 stored first in the table shown in FIG. 14b is read out. Step 218 determines the end of the sequence table depending on whether the read subroutine number data is -1. If it is -1, the operation currently being performed is assumed to have been completed. In the subroutine STBS shown in FIG. 19, the sequence table for the next operation is searched and the process returns to step 216. On the other hand, if the read subroutine number is not -1, the process moves to step 219 and the program of the subroutine specified by the read subroutine number is executed. Then, in step 220, the content of the SEQ counter is changed to the next step number or jump destination step number stored in FIG.
Return to 17. Therefore, at the start of automatic operation, Step 2
19, subroutines 4, 24, 36, and 3 registered in the sequence table shown in FIG.
Execute programs 9 and 30 to initialize the Y-axis indexing table, index the table, etc. Thereafter, the program jumps to a subroutine STBS that searches the sequence table for the next operation. Steps 221 to 225 of subroutine STBS
is a step in which the next action to be performed is determined based on the count value of the AUT counter incremented by 1 in step 220. In this embodiment, when the count value of the AUT counter is 1 to 5, the next action is determined. It is determined that the operation is a table indexing operation, a grinding operation, a dressing operation during machining, a dressing operation after machining is completed, or a machining completion operation. When the next operation to be performed is a table indexing operation, it is determined in step 226 whether or not to perform dressing (grindstone correction) after the grinding of one machined surface is completed, and if dressing is to be performed, step 227 is performed. The sequence table for determining the address position is searched, and in step 228, the count value of the AUT counter becomes 2 and the process returns to the main line. On the other hand, if dressing is not to be performed after grinding, a sequence table for indexing the table to the next grinding position is searched in step 229, and it is determined in step 230 whether grinding of all machined surfaces has been completed. Then, if the grinding of all machined surfaces has been completed, step 23 is performed.
Step 1,232 determines whether or not dressing is to be performed after grinding, or whether the number of pieces to be ground after dressing matches the set value.If neither condition is met, AUT is performed at step 233. Set the counter value to 4 and return to the main routine.
If either one of the conditions is satisfied, a sequence table for indexing the table to the dress position is searched in step 235, the AUT counter is set to 3 in step 235, and the process returns. If the next operation is a grinding operation, the sequence table for machining the machined surface using the specified grinding method is searched for in step 236, and the AUT counter is reset to zero in step 237.
If the next operation to be performed is the dressing being processed, the sequence table for performing the dressing is searched in step 238, the AUT counter is reset to zero in step 239, and the process returns to the main routine.Similarly, the next operation is performed. If it is the final dressing, a sequence table for dressing is searched for in step 240 and the process returns to the main routine, and if machining is completed, a sequence table for returning the grindstone head and table to their original positions is searched for in step 241. At step 242, the count value of the AUT counter is set to 5 and the process returns to the main routine. In this way, the contents of the searched sequence table are sequentially executed in the automatic operation routine shown in FIG. 18, and the workpiece is machined. Once the workpiece has been machined,
The count value of the AUT counter becomes 6, which is determined in step 225 and the process moves to step 243.
Set the automatic operation flag AUTF to 0 to complete automatic operation. Next, among the many subroutines that perform basic operations, those related to pulse distribution will be described. Subroutine 21 is a routine that initializes a data table when performing plunge grinding. As shown in FIG. , control parameters such as feed speed, feed stop time, spark-out time, etc. are read out, rearranged and stored in the RAM storage area. In addition, in step 251, the amount of rapid traverse movement to move the grinding wheelhead to the dry grinding start position is calculated from the data of the feed amount and grinding diameter (finished dimension) for each feed stored in the stack table, and is stored in the RAM area. is stored in the memory. Subroutine 36 and subroutine 38 are routines for moving the grinding wheel head 22 or table 11, and this subroutine is used not only when cutting the grinding wheel during air grinding, coarse grinding, fine grinding, and fine grinding. , is also used for traversing the table 11. When the subroutine 36 is called, it is indicated in step 260 that the feed is fixed feed, as shown in FIG.
If the PTP flag is set and the subroutine 38 is called, the TSN flag indicating that the feed is fixed-length feed is set in step 261, and then the process moves to step 262. At step 262, the parameter for specifying the movement direction added to the sequence table is read out.
Set it in the MVFLG register and in step 263
The speed data stored in the RAM is read out with reference to the address data added to the sequence table and set in the FEEVL register. Then, in step 264, the amount of movement is read from the RAM area and set in the PLTOTL register, after which the program jumps to the pulse distribution routine PGEN shown in FIG. This pulse distribution routine PGEN is not only executed continuously from subroutines 36 and 38, but also
Interrupt signal sent from pulse generation circuit 24
It is also executed by an interrupt request by INT2. Jumping to the pulse distribution routine PGEN:
After setting the DEN flag to zero in step 270, the command movement amount register is set in step 271.
Determine whether PLTOTL is zero. If it is zero, set the DEN flag to 1 in step 272 and return to the main routine; if it is not zero, proceed to step 273.
Proceed to the routine below. In step 273, the speed data set in the subroutine FEEVL register is output to address EO06, and the pulse generation circuit 24
In step 274, it is determined whether fixed-size feed or quantitative feed is to be performed depending on whether the TSN flag is set. If the feeding is fixed length, step 275 outputs 1 to address EO04 as data for the number of feeding pulses, and step 277
If it is not fixed-length feed, proceed to step 27.
In step 6, the amount of feed per time according to the feed speed is calculated and outputted to address EO04, and the process moves to step 277. As a result, data of 1 or a predetermined feed amount is set in the buffer register BR22. In step 277, meaningless information is output to address EO02 and a load signal is given to the preset counter 80, and in step 278, the movement direction data set in the MVFLG register is output.
Output to address EO00 and set in buffer register BR20. As a result, a pulse is output from the gate circuit 84, and the grindstone head 22 or table 11 starts moving in a predetermined direction. After that, in step 279, the current position of the grinding wheel head 22 or table 11 is corrected by subtracting or adding the amount of movement to the current position counter that stores the current positions of the grinding wheel head 22 and table 11, and in step 280, Subtract the movement amount from the command movement amount register PLTOTL. After this, in step 281, it is determined again whether or not it is a fixed-length feed, and if it is not a fixed-length feed, the process returns to the main routine.
If it is fixed size feed, DEN is sent in step 282.
Set the flag to 1 and return to the main routine. In step 212 of the automatic operation routine AUT, the state of the DEN flag is tested, and if the DEN flag is 1, a program for automatic operation is executed. Therefore, in the case of fixed-size feeding, the automatic operation routine AUT is executed every time one pulse is distributed to a predetermined axis, and the fixed-size signal from the sizing device is executed within the subroutine specified in the sequence table. state is tested. Then, when the sizing signal is sent out, the pulse distribution that has been performed so far is stopped, the next subroutine is called, and other sequence operations and pulse distribution with different feed speeds are started. Further, in the case of fixed-quantity feeding, an interrupt is generated from the pulse generation circuit 24 every time the pulse distribution of the number of pulses outputted in step 276 is completed, and the pulse distribution routine PGEN is executed many times. Then, when the grindstone head 22 or the table 11 is moved by the commanded amount and the commanded movement amount register PLTOTL becomes zero, the automatic operation routine AUT is executed and the next operation is started. As described above, in the numerical control device of the present invention, grinding of a workpiece can be performed simply by writing numerical data such as feed speed and feed amount as control parameters into a predetermined storage area, and control parameters Separately store the standard value of
When writing control parameters, standard values of control parameters stored in another storage area are transferred to the predetermined storage area. Therefore, the operator only needs to modify some of the transferred control parameters or newly write a few control parameters for which standard values are not stored, making it easy to write control parameters. Therefore, control parameters can be written in a short time. In addition, as in the above embodiment, if standard values of control parameters are stored in correspondence with multiple grinding methods, the number of standard values can be stored in common for each grinding method. control parameters can be stored as standard values,
Modifications and additions to control parameters can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a numerical control device and a grinding machine according to the present invention, and shows a plan view of the grinding machine along with a block diagram, and FIG. 2 shows an address map of the central processing unit 30 in FIG. 3 is a diagram showing the arrangement of the stack table, FIG. 4 is a diagram showing the state in which grinding method data and control parameters are stored in the stack table, and FIG. 6 is a front view of the operation panel, FIG. 7 is an electric circuit diagram of the data writing device 31, FIG. 8 is an electric circuit diagram of the panel generation circuit 24, and FIGS. 9 and 10. 11 is a flowchart showing a routine for writing grinding methods and control parameters, FIG. 11 is a table that stores lamp addresses corresponding to these as control parameters, and FIG. 12 shows control parameters required for each grinding method. Figure 13 is a diagram showing a subroutine for performing repetitive operations, Figures 14a, b to 17a, b are various operations used during automatic operation. 18 and 19 are flowcharts showing routines for automatic operation, FIGS. 20 and 21 are diagrams showing an example of a subroutine for basic operations, and FIG. 22 is a flowchart illustrating a pulse distribution routine. 10...Bed, 11...Table, 12,2
3... Pulse motor, 14... Main spindle, 15... Headstock, 17... Tailstock, 21... Grinding wheel, 22...
...Whetstone head, 24...Pulse generation circuit, 25, 26
... Pulse motor drive circuit, 30 ... Central processing unit, 31 ... Data writing device, 32 ... Strong electric interface, 33 ... Operation panel circuit, 34 ...
RTC generation circuit, 50...numeric key, 51...command key, 70...numeric key encoder, 71...
Shift control circuit, 74... command key encoder,
80... Preset counter, 81... DA converter, 82... VF converter, 83... Frequency division circuit, 8
4...Gate circuit, 85...Zero detection circuit, BR1
0~BR22...Buffer register, DP10~
DP55...Display unit, GB1-GB3...Gate buffer, L10-L410...Display lamp, M...Memory, W...Workpiece.

Claims (1)

[Scope of Claims] 1. Control program storage means for storing a control program for controlling the relative movement of the grinding wheel and the workpiece to grind the workpiece in a predetermined grinding method; a parameter storage means for storing control parameters such as feed rate required for machining; a standard parameter storage means for storing standard values of some or all of the control parameters; a transfer means for transferring standard values of the parameters to the parameter storage means, and partial modification of the parameters transferred to the parameter storage means by the transfer means and/or writing of parameters not transferred to the parameter storage means; and a parameter writing/correcting means for executing the control program stored in the control program storage means to control the relative position of the grinding wheel and the workpiece by referring to the control parameters stored in the parameter storage means. 1. A numerical control device for controlling grinding, characterized by comprising a control means for grinding a workpiece into a predetermined shape. 2 The control program storage means stores a plurality of control programs for machining a workpiece using a plurality of different grinding methods, and the standard parameter storage means stores a plurality of control programs for machining a workpiece using a plurality of different grinding methods. A plurality of sets of standard values of control parameters necessary for grinding are stored in the control parameter storage means, and the transfer means stores the standard values of control parameters corresponding to the designated grinding method in the control parameter storage means. The control means has standard parameter selection means for selecting from standard values of a plurality of control parameters, and the control means has program selection means for selecting a control program corresponding to a specified grinding method from the control program storage means. A numerical control device that controls grinding processing.