JPH07239707A - Numerical controller equipped with remote operation function - Google Patents

Abstract

PURPOSE:To prevent machining program data from being absent in an operation buffer, to evade the formation of a cutter mark on a work and vibration even when the operation buffer becomes empty, and to set whether or not a decrease in cutting speed and the retraction of a cutting tool are effective or ineffective in a machining program. CONSTITUTION:An operation condition setting part 21 sets an operation buffer remaining block quantity and a cutting feed override as cutting feed speed reduction conditions when the amount of remaining data of machining program data in the operation buffer decreases. A control part 14 decreases the cutting speed according to the cutting feed override when the number of left blocks of machining program data in the operation buffer becomes less than the operation buffer remaining block quantity, and puts the cutting speed back when the number of remaining blocks of the machining program in the operation buffer exceeds the operation buffer remaining block quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores machining program data transferred from a machining program storage device (hereinafter referred to as a host) through a communication means in an operation buffer in a memory, and at the same time machining program data in the operation buffer. The present invention relates to a numerical control device having a remote operation function of sequentially taking out blocks for operation.

[0002]

2. Description of the Related Art Conventionally, a machining program data transferred from a host through a communication means is stored in a file device or a memory of a numerical control device, and the numerical control device controls the machining using the stored machining program data. DNC systems are known. On the other hand, with the widespread use of CAD / CAM systems and high-speed machining of numerical control devices, in order to process more complicated workpieces at high speed, the processing program data has been made into smaller blocks and larger in capacity. Storing such large-capacity machining program data collectively in the file device or memory of the numerical controller requires a large-capacity file device or memory in the numerical controller, and also requires a large amount of machining program data transfer time. However, there was a big problem in terms of cost and availability.

As a function for solving such a problem, the machining program data transferred from the host to the numerical control device is stored in the operation buffer in the memory, and the machining program data in the operation buffer is sequentially taken out in block units for operation. The remote operation function to perform is widely used. FIG. 8 is a block diagram of a remote operation processing of a conventional numerical control device having a remote operation function. The machining program data PD transferred from the host 6 is stored in the operation buffer via the communication control unit 2 of the numerical control device 1. 3 is transferred. Machining program data PD transferred to operation buffer 3
Are taken out to the block analysis unit 4 in block units and sequentially analyzed, and the analysis result SR is passed to the block execution unit 5 for processing. FIG. 9 is a block diagram of a conventional internal processing of the block analysis unit 4, that is, the block read control unit 1
1 reads the machining program data PD from the operation buffer 3 in block units, and passes it to the execution data generation unit 12.
The execution data generation unit 12 analyzes the contents of the block based on the block transferred from the block read control unit 11 and transfers the analysis result SR to the block execution unit 5.

[0004]

However, in the numerical control device having the remote operation function as described above, the block extraction processing of the block analysis unit 4 and the block execution unit 5 for sequentially extracting the machining program data to perform the operation. On the other hand, when the block transfer process of the machining program data transferred from the host 6 to the operation buffer 3 is slow, the operation buffer 3 becomes empty, the machining stops, and the workpiece has a cutter mark or vibration. To do. In order to avoid such a situation, it is conceivable to reduce the cutting feed rate, but the cutting feed rate will decrease even during rough machining where even if the workpiece has a cutter mark, it will not cause machining defects, Overall processing time will be extended. In addition, the transfer capacity of the host generally differs depending on the processing contents and load conditions of the host, and it is difficult to guarantee a constant transfer of machining program data, and it is difficult to specify the cutting feed rate from the transfer capacity of the host. In many cases.
The present invention has been made under the circumstances as described above,
An object of the invention of claim 1 of the present application is to provide a numerical control device having a remote operation function for preventing the operation buffer from becoming empty. Further, an object of the invention of claim 3 of the present application is to provide a numerical control device having a remote operation function capable of avoiding the generation of a cutter mark or vibration on a work as much as possible even when the operation buffer becomes empty. Especially. Further, the object of the inventions of claims 2 and 4 of the present application is that the invention of claim 1 or claim 3 is effective only in a place where the machining should not truly stop, thereby wasting the machining time. It is to provide a numerical control device having a remote operation function that can be reduced.

[0005]

According to the present invention, machining program data transferred from a host via a communication means is stored in an operation buffer in a memory, and the machining program data in the operation buffer is sequentially taken out in block units. The present invention relates to a numerical control device having a remote operation function for performing an operation by operating the cutting feed rate when the remaining data amount of the machining program data in the operation buffer decreases. Setting means for setting the number of remaining blocks in the operation buffer and the cutting feed override, which are the conditions for reducing the cutting feed rate for decreasing, and the number of remaining blocks of the machining program data in the operation buffer are less than the number of remaining blocks in the operation buffer The cutting speed is reduced according to the cutting feed override, A cutting speed that restores the cutting speed when the number of remaining blocks of the machining program data in the operation buffer exceeds the number of remaining blocks in the operation buffer by transferring the machining program data from the program storage device. The object of the invention of claim 2 of the present application is achieved by providing a control means, and the processing of the cutting speed control means by designating a cutting feed speed reduction condition valid command or invalid command in the machining program data. The above object of the invention of claim 3 of the present application is achieved by providing a generating means for validating or invalidating the tool. The tool being cut is mounted on the tool mounting axis when the machining program data in the operation buffer becomes empty. Set the evacuation amount and the number of operation restart blocks, which are the tool evacuation conditions for evacuation in the direction and then restart the operation. That the setting means, if the remaining number of blocks of the machining program data in the operating buffer becomes zero, the tool during cutting after block end as just before the 0 is retracted by the amount of the retreat relief amount,
By transferring the machining program data from the machining program storage device, when the number of remaining blocks of the machining program data in the operation buffer is equal to or more than the number of operation restart blocks, the tool is moved from the retracted position. The object of the invention of claim 4 of the present application is achieved by providing a tool withdrawal control means for returning the amount of the withdrawal and escape and restarting the machining, and the above object of the invention of claim 4 in the machining program data. Is achieved by providing a generation means for validating or invalidating the processing of the tool withdrawal control means.

[0006]

According to the present invention, the cutting speed is reduced when the remaining data amount of the machining program data in the operation buffer becomes a certain amount or less, so that the consumption of the machining program data is suppressed. Since the machining program data is transferred from the host during that time, it is possible to prevent the machining program data in the operation buffer from becoming empty. In addition, even if the cutting program data transfer from the host is slow and the operation buffer becomes empty even if the cutting speed is reduced, the workpiece may be marked with cutter marks or vibrate by retracting the cutting tool. It can be avoided. Furthermore, in the machining program data, the machining program data in the operation buffer is effective / ineffective of reducing the cutting speed when it falls below a certain amount or the effective / ineffective of cutting tool evacuation when the operation buffer becomes empty. Can be set, so that it is possible to reduce the machining speed at a machining location where the cutting speed is not required and the evacuation of the cutting tool is unnecessary.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A remote operation processing block diagram of a numerical controller having a remote operation function according to the present invention is different from the conventional example shown in FIG. 8 in that internal processing blocks of a block analysis unit are different,
It is the same except that a remote operation condition setting unit is newly provided. An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an internal processing block diagram of a block analysis unit 40 of a numerical controller having a remote operation function according to the present invention, and whether the remote operation condition setting unit 21 reduces the cutting feed rate as shown in FIG. Whether the cutting feed speed is valid / invalid, and the amount of remaining machining program data in the operation buffer when reducing the cutting feed speed is the number of remaining blocks in the operation buffer and the cutting feed set when the number of blocks is less than that number. Cutting is performed when the cutting feed speed reduction condition, which is composed of the relationship with the cutting feed override that represents the speed reduction ratio, is set and the machining program data in the operation buffer is empty, that is, when the number of remaining blocks in the operation buffer becomes 0. Whether the tool inside is retracted in the axial direction of the tool mounting, whether the tool is retracted is enabled / disabled, the escape amount is required, and the operation required to restart the operation. Make settings of the tool retracted condition consists resumption block number, and passes them cutting speed reduction conditions and tool save condition DC to the remaining block determination unit 13. The remaining block determination unit 13 counts the number of remaining blocks in the operation buffer, and determines the cutting speed reduction condition, the tool withdrawal condition DC, and the machining program data P.
According to various command information specified in D, when the cutting feed speed changing condition is satisfied, the cutting speed control unit 14
Cutting feed override OR for changing cutting feed speed
The cutting speed control unit 14 generates the block data DBC for changing the cutting feed speed from the value, and passes it to the execution data generating unit 12. Further, when the number of remaining blocks in the operation buffer becomes 0 and the tool evacuation is effective, the evacuation escape amount EV and the evacuation command SE are passed to the tool evacuation control unit 15, and the tool evacuation control unit 15 Evacuation block data D
The BE is generated and passed to the execution data generation unit 12. The normal machining program data PD is passed to the execution data generation unit via the block read control unit 11 in block units as in the conventional case.

FIG. 7 shows an example of machining program data.
Blocks N001 to N006 are examples in which remote operation conditions are directly set from the machining program data. N
"BLCS" of 001 means start of cutting feed rate lowering condition setting, and "BLCE" of N005 means end. N002 to N004 sandwiched between “BLCS” and “BLCE” are specific cutting feed rate reduction conditions,
The ratio of the number of remaining blocks in the operation buffer and the corresponding cutting feed override is set for each block separated by commas. "TSLS" of N006 is a command for setting the escape escape amount, and after "=", the actual escape escape amount and the number of operation restart blocks are set separated by commas. In this example, for example, N002 means that the cutting feed override is 80% when the number of blocks remaining in the operation buffer is 100, and N006 is set as the escape escape amount.
mm, and the number of operation restart blocks is set to 100.
In this embodiment, when the remote operation condition is set from the machining program data as shown in FIG. 7, the remote operation condition set by the remote operation condition setting unit 21 in FIG. 6 is invalidated. N103 and Nxxx "CTO
"V" is a command for instructing valid / invalid of the cutting feed speed lowering condition, and "TLSL" is a command for instructing valid / invalid of tool retract. In both commands, "ON" is instructed after "=" When the command is given, it means valid, and when the command is "OFF", it means invalid.
In N103, the cutting feed rate lowering condition and the tool retreat are enabled, and in Nxxx, the cutting feed rate lowering condition and the tool retreat are disabled. In this embodiment, when the CTOV or TLSL command is not specified in the machining program data, each valid / invalid remote operation condition set by the remote operation condition setting unit 21 in FIG.
I try to obey the invalid conditions.

FIG. 2 to FIG. 5 are flowcharts of the process of the remaining block determination unit 13, which is the remote operation condition setting unit 2
The remote operation conditions are read from 1 (S1). The cutting feed speed decrease valid / invalid flag is set from the read remote operation condition (S2), the cutting feed speed decrease condition table is created (S3), the tool evacuation effective / ineffective flag is set (S4), and the tool evacuation condition is set. Is set (S5). The cutting feed rate reduction condition table created in step S3 is created as a correspondence table of the remaining number of blocks in the operation buffer and the cutting feed override, as in the cutting feed rate reduction condition table of FIG. In step S6, a block of machining program data is read from the operation buffer, and it is checked whether or not there is a "BLCS" command in the read block (S7). If there is no "BLCS" command in the read block, step S1
Jump to the process after 1. If there is a "BLCS" command in the read block, the cutting feed speed lowering condition registered in the next block is read up to the block "BLCE" which is the cutting feed speed lowering condition setting end command (S8, S9). When the "BLCE" block is read, a cutting feed rate reduction condition table is created based on the cutting feed rate reduction condition read in step S8 and replaced with the table created in step S3 (S10).

In step S11, it is checked whether or not there is a "TSLS" command in the read block, and if there is a command, the tool withdrawal condition is set and replaced with the tool withdrawal condition set in step S5. (S12). In step S13, it is checked whether or not there is a "CTOV" command in the read block, and if there is a command, the cutting feed speed decrease effective / ineffective flag is set, and the cutting feed speed set in step S2 is set. Replace with degraded valid / invalid flag (S
14). In step S15, it is checked whether or not there is a "TLSL" command in the read block,
If the command exists, the tool retraction valid / invalid flag is set and replaced with the tool retraction valid / invalid flag set in step S4 (S16). Step S17
Then, in step S18, it is checked whether or not the block currently being executed is under cutting (S17) and whether or not all the machining program data is read in the operation buffer (S18).

When the cutting speed is not being cut or when all the data of the cutting program data is being read, the cutting speed is controlled in order to cancel if the cutting feed speed has been lowered in the past. Control unit 14
Then, 100% of the cutting feed override is passed to (S20), and the process jumps to step S30 where the tool retracting process is performed. When cutting is in progress and all the machining program data has not been read, it is determined that the cutting feed rate reduction processing needs to be checked, and the number of blocks remaining in the operation buffer is counted (S19). In step S21, it is checked whether or not the cutting feed rate reduction valid / invalid flag is valid. If it is invalid, the cutting feed rate reduction processing is not checked, and cutting feed rate reduction control has been performed in the past. In order to cancel the case, 100% of the cutting feed override is passed to the cutting speed control unit 14 (S24), and the process jumps to step S25. If the cutting feed rate reduction valid / invalid flag is valid in step S21, the cutting feed override corresponding to the current remaining number of blocks is obtained from the cutting feed rate reduction condition table (S2).
2) Pass the cutting feed override to the cutting speed control unit 14 (S23).

In step S25, the tool evacuation valid / invalid flag is checked. If the flag is invalid, the process jumps to step S30 for canceling the tool evacuation, and if valid, the number of remaining blocks in the operation buffer is determined in step S26. Check if it is 0 or not. If the number of remaining blocks in the operation buffer is not 0, the tool evacuation process is not performed and the operation resumption check process after the tool evacuation in step S29 is jumped to. The amount is passed (S27), the tool retracting flag is turned ON (S28), and the process returns to step S6 to read the next block from the operation buffer. In step S29, the number of remaining blocks and the number of operation restart blocks are checked. If the number of remaining blocks is less than or equal to the number of operation restart blocks, the operation restart process is not performed and the process jumps to step S33.

If the number of remaining blocks is larger than the number of blocks for restarting operation, the tool evacuation flag is set to O in step S30.
Check if it is N. If the tool withdrawal flag is OFF, the process jumps to step S33, and if the tool withdrawal flag is ON, it is considered that the tool withdrawal has been canceled, and in step S31 a machining resumption command is issued to the tool withdrawal control unit 15 to perform machining. To restart. And ON
The tool retracting flag that is set to OFF is turned off (S3
2) Go to step S33. In step S33, it is checked whether or not the tool evacuation flag is ON,
If it is not turned on, the machining program data block read from the operation buffer is passed to the block read control unit 11 (S34). In step S35, it is checked whether or not all the machining program data blocks have passed to the block read control unit 11, and if all the machining program data blocks have passed, this processing ends. If all the machining program data blocks have not been passed, the process returns to step S6 to read the next block from the operation buffer.

[0014]

As described above, according to the numerical controller having the remote operation function of the present invention, it is possible to perform machining control so that the operation buffer does not become empty, and machining when the operation buffer becomes empty. It is possible to avoid machining defects due to cutter marks or vibrations on the workpiece when the workpiece is stopped. Further, even if the operation buffer becomes empty despite such control, it is possible to avoid machining failure due to the cutter mark being attached to the work by retracting the tool. Further, it is possible to invalidate the machining part where the main machining control is unnecessary and the machining which is completely unnecessary, and it is possible to reduce the waste of the machining time accompanying the continuous operation of the main machining control and improve the operation rate. it can. Therefore, the processing cost can be reduced by drastically reducing the man-hours.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a main part of a numerical control device having a remote operation function of the present invention.

FIG. 2 is a first flowchart showing an operation example of the device of the present invention.

FIG. 3 is a second flowchart showing an operation example of the device of the present invention.

FIG. 4 is a third flowchart showing an operation example of the device of the present invention.

FIG. 5 is a fourth flowchart showing an operation example of the device of the present invention.

FIG. 6 is a diagram showing an example of setting remote operating conditions according to the device of the present invention.

FIG. 7 is a diagram showing an example of machining program data related to the device of the present invention.

FIG. 8 is a block diagram showing an embodiment of a numerical control device having a remote operation function of a conventional technique.

FIG. 9 is a block diagram showing an example of a main part of a conventional device.

[Explanation of symbols]

 1 Numerical Control Device 2 Communication Control Section 3 Operation Buffer 4 Block Analysis Section 5 Block Execution Section 6 Host 11 Block Read Control Section 12 Execution Data Generation Section 13 Remaining Block Judgment Section 14 Cutting Speed Control Section 15 Tool Evacuation Control Section 21 Remote Operation Condition Setting section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G05B 19/18 7531-3H G05B 19/403 X

Claims (4)

[Claims] 1. A remote control for storing a machining program data transferred from a machining program storage device via a communication means in an operation buffer in a memory, and sequentially taking out the machining program data in the operation buffer in block units for operation. In a numerical controller having an operation function, the number of blocks remaining in the operation buffer, which is a cutting feed rate lowering condition for reducing the cutting feed rate when the remaining data amount of the machining program data in the operation buffer decreases, and the cutting. Setting means for setting a feed override, and when the number of remaining blocks of the machining program data in the operation buffer becomes equal to or less than the number of remaining blocks in the operation buffer, the cutting speed is reduced according to the cutting feed override, and the machining is performed. Machining program data is transferred from the program storage device. As a result, when the number of remaining blocks of the machining program data in the operation buffer exceeds the number of remaining blocks in the operation buffer, the cutting speed control means for returning the cutting speed to the original value is provided. Numerical control device equipped with a remote operation function. 2. The method according to claim 1, further comprising a generation unit for validating or invalidating the processing of the cutting speed control unit by designating a cutting feed speed reduction condition valid command or invalid command in the machining program data. Numerical control device with remote control function. 3. A remote control for storing a machining program data transferred from a machining program storage device via a communication means in an operation buffer in a memory, and sequentially taking out the machining program data in the operation buffer in units of blocks. In a numerical control device equipped with an operation function, when the machining program data in the operation buffer becomes empty, the tool being cut is retracted in the axial direction of the tool mounting, and then the tool retract condition for restarting the operation. Setting means for setting the escape escape amount and the number of blocks for restarting operation,
When the number of remaining blocks of the machining program data in the operation buffer becomes 0, the tool being cut is evacuated by the evacuation amount after the end of the block immediately before 0, and machining is performed from the machining program storage device. By transferring the program data, when the number of remaining blocks of the machining program data in the operation buffer becomes equal to or greater than the number of operation restart blocks, only the amount of the escape clearance from the position where the tool is retracted A numerical control device having a remote operation function, comprising: a tool withdrawal control means for returning and restarting machining. 4. The remote operation according to claim 3, further comprising generation means for enabling or disabling the processing of the tool withdrawal control means by designating a tool withdrawal valid command or an invalid command within the machining program data. Numerical control device with functions.