JP2011258138A - Correction tool locus information generation system, correction tool locus information generation method and correction tool locus information generation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily generate correction tool locus information for correction processing of workpiece.SOLUTION: A correction tool locus information generation system S0 to generate correction tool locus information D4 for correction processing of workpiece to be processed based on tool locus information D1 comprises: tool locus information dividing means M1 for generating divided tool locus information D2 by dividing the tool locus information D1 in accordance with a combination of numerical control commands of the tool locus information D1; and correction processing range defining means M3 for defining a range having a dimension error among divided ranges of the divided tool locus information D2 as a correction processing range.

Description

  The present invention relates to a technique for creating corrected tool path information for correcting a workpiece to be processed based on tool path information.

  Conventionally, when a work such as a cutting process is performed on a workpiece, a dimensional error is measured at a predetermined measurement point after a finishing process is performed based on predetermined tool path information. When the dimensional error is not within the allowable range, correction processing is performed.

By the way, a method of dividing tool trajectory information is known in order to prevent abnormal vibrations or the like that occur when curving tool trajectory information for machining a workpiece (see, for example, Patent Document 1).
In this method, the amount of change in the direction in which the tool advances is calculated using the tool trajectory information and the tool posture information. In addition, a threshold value for the amount of change is set by the operator, and the tool trajectory information is divided at locations where the set threshold value is exceeded.

Japanese Patent No. 3952463

  In the method of dividing the tool trajectory information described in Patent Document 1, the tool trajectory is used in addition to the tool trajectory information to calculate the amount of change in the direction in which the tool advances, and a threshold is set for the amount of change. Since the calculation is performed, the method for dividing the tool trajectory information becomes complicated.

  Further, the method of dividing the tool path information described in Patent Document 1 described above is for preventing abnormal vibration or the like that occurs when the tool path information is curved as described above, and considering the creation of corrected tool path information. Since it is not a thing, it cannot be applied to the creation of correction tool trajectory information as it is.

  An object of the present invention is to provide a correction tool path information generation system, a correction tool path information generation method, and a correction tool path information generation program capable of easily generating correction tool path information for correcting a workpiece. It is.

  The correction tool trajectory information creation system of the present invention is a correction tool trajectory information creation system for creating correction tool trajectory information for correction machining of a workpiece to be machined based on the tool trajectory information. By dividing the tool trajectory information according to the combination of the tool trajectory information, the tool trajectory information dividing means for creating the divided tool trajectory information, and correcting the range where the dimensional error has occurred in the divided range of the divided tool trajectory information Correction processing range determining means for determining the range.

  The correction tool trajectory information creation method of the present invention is the correction tool trajectory information creation method in which the correction tool trajectory information for correction machining of a workpiece to be machined based on the tool trajectory information is created using a computer. By dividing the tool trajectory information according to the combination of the numerical control command values of the information, the divided tool trajectory information is created, and the range where the dimensional error has occurred is corrected in the divided range of the split tool trajectory information. Decide on a range.

  The correction tool trajectory information creation program of the present invention is a correction tool trajectory information creation program for causing a computer to create correction tool trajectory information for correction machining of a workpiece to be machined based on the tool trajectory information. A function for generating the divided tool locus information by dividing the tool locus information according to the combination of numerical control command values of the locus information, and a range in which a dimensional error has occurred in the divided range of the divided tool locus information. And a function to determine the correction processing range in a computer.

  According to the present invention, it is possible to easily create correction tool path information for workpiece correction processing.

It is a schematic block diagram which shows the correction | amendment processing system containing the correction tool locus | trajectory information preparation system which concerns on one embodiment of this invention. It is a perspective view which shows the workpiece | work in one embodiment of this invention. It is a flowchart for demonstrating creation of the division | segmentation tool locus | trajectory information in one embodiment of this invention. It is a correspondence table showing the correspondence between command value combinations and their identification values in an embodiment of the present invention. It is a flowchart for demonstrating arrangement | positioning of the measurement point in one embodiment of this invention. It is explanatory drawing (the 1) for demonstrating arrangement | positioning of the measurement point in one embodiment of this invention. It is explanatory drawing (the 2) for demonstrating arrangement | positioning of the measurement point in one embodiment of this invention. It is a flowchart for demonstrating determination of the correction | amendment process range in one embodiment of this invention. It is explanatory drawing for demonstrating the process of the correction application means in one embodiment of this invention.

Hereinafter, a correction tool path information generation system, a correction tool path information generation method, and a correction tool path information generation program according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a correction machining system H0 including a correction tool trajectory information creation system S0 according to an embodiment of the present invention.
The hardware of the correction machining system H0 includes a computer H1 having a communication function with the machining device H2, a machining device H2 having a numerical control function, and a communication cable H3 that connects the computer H1 and the machining device H2.

  The software of the correction machining system H0 includes a correction tool path information creation system S0, a CAM system S1, a measurement system S2, a correction pattern database DB1, tool path information D1, divided tool path information D2, measurement point information D3, and a correction tool. Includes trajectory information D4.

  The correction tool path information creation system S0 includes a tool path information dividing unit M1, a measurement point arrangement unit M2, a correction machining range determination unit M3, and a correction application unit M4. As will be described in detail later, the correction tool trajectory information creation system S0 creates correction tool trajectory information D4 for correction machining of the workpiece W1 to be machined based on the tool trajectory information D1.

The CAM system S1 is not particularly limited, and commercially available three-dimensional CAM software can be used as appropriate.
The measurement system S2 is not particularly limited, and commercially available three-dimensional measurement software capable of measuring a dimensional error at a predetermined measurement point in contact or non-contact can be appropriately used.
As shown in FIG. 8, the correction pattern database DB1 is registered in association with the dimension error 302, the NC (Numerical Control) command value 90 of the tool trajectory information D1 corresponding thereto, and the machining condition correction rate 401. Yes. Here, the processing conditions refer to, for example, a feed rate, a spindle rotation speed, a cutting pitch, and the like.

  The tool path information D1 includes information for determining control points of a tool path T1 (illustrated by three lines in FIG. 2) for machining the workpiece W1 as shown in FIG. An identifier 80 (for example, “SHIAGE” indicating finishing processing) indicating the distinction between processing and finishing processing is included.

As shown in FIG. 8, the divided tool trajectory information D2 is configured to include tool trajectory information D1 and an identifier 201 representing the divided position.
The measurement point information D3 is configured to include position information of the measurement point 301 and information on the dimension error 302.

  The correction tool trajectory information D4 is configured to include information for determining tool trajectory information to be processed in the correction processing range 501 such as a G code, an M code, and a numerical value.

Hereinafter, the creation of the correction tool trajectory information will be described according to the operation sequence of the correction machining system H0.
As the first order, the tool trajectory information D1 for machining the workpiece W1 shown in FIG. 2 is created by the CAM system S1. As shown in FIG. 8, in the tool path information D1, an identifier 80 indicating the distinction between roughing and finishing (for example, SHIAGE indicating finishing) is added to information for determining the control point of the tool path T1. .

  The addition of the identifier 80 indicating the distinction between roughing and finishing may be performed using manual code input when creating the tool trajectory information D1 or automatic code input for recognizing when the uncut portion is “0”. good. The tool path information D1 described below will be described as tool path information to which the finishing identifier 80 is added. When the computer H1 acquires the tool path information D1 from another system, the CAM system S1 can be omitted from the computer H1.

  As the second order, the tool trajectory information dividing means M1 divides the tool trajectory information D1 in accordance with the NC command value combination 90 shown in FIG. 4 (divided at the place where the NC command value combination 90 in the moving direction is switched). Then, the divided tool trajectory information D2 is created as a division result. The process of the tool trajectory information dividing unit M1 will be described using the flow of FIG.

  The processing shown in FIG. 3 and the processing shown in FIG. 5 and FIG. 7 described later include a computer having a very standard configuration, that is, a CPU that controls each component by executing a control program, a ROM, A control unit that includes a RAM, a magnetic recording medium, and the like and that allows the CPU to control each component, a storage unit that is used as a work area or a storage area for various data when the CPU executes the control program, and user operations An I / F that provides an interface function for data exchange with other devices, an input unit that obtains various data corresponding to, an output unit that presents various data on a display and notifies the user, and the like And an information processing terminal provided with a unit.

  Further, in order to cause the information processing terminal to perform the processes shown in FIGS. 3, 5, and 7, for example, a control program (correction) that causes the information processing terminal to perform the processes of the procedures shown in FIGS. Tool trajectory information creation program, etc.), and the control program is read out and executed by the information processing terminal. As a result, the information processing terminal includes the correction tool trajectory creation system S0 shown in FIG. It functions as the computer H1.

As shown in FIG. 3, first, the first line of the tool path information D1 is read (step S101).
Next, the identification value 100 corresponding to the NC command value of the line being read is determined (step S102). Specifically, when there is no X-axis / Y-axis / Z-axis command value as in the information (correspondence table) D5 indicating the correspondence between the command value combination 90 and the identification value 100 shown in FIG. The identification value 100 is “0”, “1” if there is a command value for the X axis, “2” if there is a command value for the Y axis, “4” if there is a command value for the Z axis, In the case of the three combinations, the identification value 100 is the sum of the identification values of the respective axes. For example, the identification value 100 is determined only by the NC command values only in the X-axis / Y-axis two-axis directions, or whether the numerical values of the X-axis / Y-axis / Z-axis NC command values are positive or negative. The identification value 100 may be determined, or the identification value 100 may be determined according to conditions other than the numerical value of the moving direction such as the rotation direction of the tool, or the tool trajectory information may be divided according to the combination of NC command values. For example, the division condition is not particularly limited.

  If the identification value 100 of the read line is not “0”, that is, not “no command value” (step S103) and the identification value 100 is different from the previous line (step S104), the read value is read. The tool trajectory information D1 is divided at (before) the current line (step S105).

  On the other hand, when the identification value 100 of the read line is “0” (step S103) or when the identification value 100 is the same as the previous line (step S104), the above division (step S105) I will not.

  Thereafter, if the line being read is the last line (step S106), the tool trajectory information D1 in which the identifier 201 indicating the divided position is added as shown in FIG. 8 is stored as the divided tool trajectory information D2 (step S107). ), The process is terminated. In the present embodiment, the divided tool locus information D2 is not obtained by dividing the tool locus information D1 into a plurality of pieces, but is obtained by adding an identifier 201 indicating the divided position to the tool locus information D1.

If the line being read is not the final line (step S106), the next line of the tool trajectory information D1 is read (step S108), and the processing from determination of the identification value (step 102) is repeated.
The above is the process of the tool trajectory information dividing unit M1.

  As a third order, the measurement point arrangement means M2 arranges one or more measurement points in each of the divided ranges of the tool trajectory information divided using the divided tool trajectory information D2, and the arrangement result is obtained as the measurement point information D3. Record. The process of the measurement point arrangement unit M2 will be described with reference to the flow of FIG. 5 and FIG.

First, the divided tool path information D2 is read (step S201).
The next step S202 is the start of a loop that repeats the process for the number of ranges delimited by the identifier 201 that represents the division position.

  In the next step S203, the variable N is the number of control points in the divided range of the tool trajectory information to be processed, the variable I is the quotient of N ÷ 2, and the variable J is the remainder of N ÷ 2 (step S204).

  For example, as shown in FIG. 6A, when the number of control points in the divided range of the divided tool path information D2 is 4, the variable N that is the number of control points is “4”, and the variable I that is a quotient of N ÷ 2 is “ The variable J which is the remainder of 2 ”and N ÷ 2 is“ 0 ”.

  As shown in FIG. 6B, when the number of control points in the divided range of the divided tool path information D2 is 5, the variable N that is the number of control points is “5”, and the variable I that is a quotient of N ÷ 2 is “ The variable J, which is the remainder of 2 ”and N ÷ 2, is“ 1 ”.

  When the variable J is “0”, the measurement point 301 by the measurement system S2 shown in FIG. 1 is arranged at the midpoint between the I-th control point and the I + 1-th control point from the start point (N1) (step S206). ). For example, when the variable J is “0”, as shown in FIG. 6A, the measurement point 301 is arranged at the midpoint between the second that is the Ith and the third that is the I + 1th from the start point (N1).

  On the other hand, when the variable J is not “0”, the measurement point 301 is arranged at the I + 1th control point from the start point (N1) (step S207). For example, when the variable J is “1” instead of “0”, as shown in FIG. 6B, the measurement point 301 is arranged at the third control point that is I + 1 from the start point (N1).

The next step S208 is the end of the loop started in step S202.
After the above loop processing is performed in each of the divided ranges of the divided tool locus information D2, the determined measurement point 301 is written in the measurement point information D3 shown in FIG. The process ends. The above is the process of the measurement point arrangement unit M2. Note that the arrangement of the measurement points 301 may be set by the user on the display screen of the computer H1.

  As the fourth order, the processing apparatus H2 shown in FIG. 1 acquires the tool path information D1 from the computer H1 via the communication cable H3, and processes the workpiece W1 according to the acquired tool path information D1.

  As the fifth order, the measurement system S2 measures the dimensional error 302 using the measurement point information D3. In addition, when the computer H1 acquires information of the dimensional error 302 from another system, the measurement system S2 can be omitted from the computer H1.

  The measurement system S2 moves a measurement element (not shown) attached to the processing apparatus H2 via the communication cable H3 to the measurement point 301, and the dimensional error 302 of the measurement point 301 detected by the measurement element is, for example, from the measurement point 301. Obtained by linear distance.

The measurement system S2 records a dimensional error 302 corresponding to the measurement point 301 in the measurement point information D3 shown in FIG. Note that the dimensional error 302 may be recorded so as to be identifiable, for example, whether it is outside the allowable range.
As the sixth order, the corrected machining range determination means M3 uses the divided tool path information D2 and the measurement point information D3 to indicate the range in which the dimension error 302 has occurred in the divided range of the divided tool path information D2. The correction processing range 501 shown in FIG. The processing of the correction processing range determination means M3 will be described using the flow of FIG.

First, one or more measurement points 301 in which a dimensional error 302 outside the allowable range is generated are extracted from the measurement point information D3 (step S301).
Next, the first line of the divided tool path information D2 is read (step S302).

The control point P1 is a tool position before machining (step S303).
Further, the control point P2 is a control point of the line being read (step S304).
Then, a straight line L1 passing through the control point P1 and the control point P2 is obtained (step S305).

  When the extracted measurement point 301 exists on the straight line L1 (step S306), the divided range of the divided tool trajectory information D2 including the control point P1 and the control point P2 is the corrected machining range shown in FIG. It is set to 501 (step S307). When the measurement point 301 does not exist on the straight line L1 (step S306), the correction processing range 501 is not set.

If the line being read is the last line (step S308), the process ends.
On the other hand, if the line being read is not the last line (step S308), the control point P1 becomes the original control point P2 (step S309).

Then, the next line of the divided tool locus information D2 is read (step S310), and the process is repeated from the above-described step S304 where the control point of the line being read is the control point P2.
The above is the processing of the correction processing range determination means M3. If the measurement point 301 has an identifier or the like indicating the divided range of the divided tool trajectory information D2, the corrected machining range determination unit M3 may set the range corresponding to the identifier as the corrected machining range 501. .

  As the seventh order, the correction applying means M4 creates the correction tool trajectory information D4 using the information on the correction processing range 501, the measurement point information D3, the correction pattern database DB1, and the like. The processing of the correction application unit M4 will be described with reference to FIG.

  In the correction pattern database DB1, a dimension error 302, a corresponding NC command value combination 90, and a processing condition correction factor 401 are linked and registered in advance by the user based on the past processing results and the like.

First, the divided tool trajectory information D2 is read, and one or more corrected machining ranges 501 determined as described above are extracted therefrom (step S401).
Next, in the correction pattern database DB1, a feed rate correction factor, which is a processing condition, is determined from the relationship between the NC command value combination 90 in the correction processing range 501 and the dimension error 302 described in the measurement point information D3.

Finally, the corrected tool trajectory information D4 is created by applying the determined feed rate correction factor to the corrected machining range 501. The above is the processing of the correction application unit M4.
In addition to the feed speed, for example, the spindle rotational speed, the cutting pitch, etc. may be corrected as the machining conditions. The correction application means M4 is omitted, and the corrected machining range 501 is directly used as the corrected tool trajectory information D4. It is also possible to do.

  As the eighth order, the processing device H2 acquires the correction tool trajectory information D4 from the computer H1 via the communication cable H3, and corrects the workpiece W1 according to the acquired correction tool trajectory information D4.

  In the present embodiment described above, the tool path information dividing unit M2 divides the tool path information D1 according to the combination 90 (identification value 100) of the numerical control command values of the tool path information D1, thereby dividing the divided tool path. Information D2 is created. Further, the corrected machining range determination means M3 determines the range in which the dimension error 302 has occurred in the divided range of the divided tool locus information D2 as the corrected machining range 501.

Therefore, it is possible to easily determine the corrected machining range 501 without requiring a complicated calculation formula or threshold value to divide the tool trajectory information D1.
Therefore, according to the present embodiment, the correction tool trajectory information D4 for correction processing of the workpiece W1 can be easily created.

  Further, in the present embodiment, the measurement point arrangement unit M2 arranges the measurement points 301 at which the dimension error 302 of the workpiece W1 is measured on the respective paths in the divided range of the divided tool path information D2. Therefore, when a dimensional error 302 occurs in the divided range of the divided tool trajectory information D2, each divided range can be set as the corrected machining range 501.

  Further, in the present embodiment, the tool trajectory information dividing means M1 is the place where the combination 90 (identification value 100) of the numerical control command values in the movement direction (X axis / Y axis / Z axis) of the tool trajectory information D1 is switched. The tool path information D1 is divided. Therefore, the correction tool trajectory information D2 can be created more easily.

  In the present embodiment, the tool path information dividing unit M1 divides the tool path information D1 (identifier 80) for finishing. Therefore, the correction tool trajectory information D2 for correction processing in finishing processing after rough processing can be easily created.

80 Discriminating between rough machining and finishing machining 90 NC command value 100 Discrimination value of NC command value combination 201 Identifier representing the division position of tool trajectory information 301 Measurement point 302 Dimensional error 401 Machining condition correction rate 501 Correction machining range D1 Tool path information D2 Divided tool path information D3 Measurement point information D4 Correction tool path information D5 Information indicating correspondence between command value combinations and identification values DB1 Correction pattern database H0 Correction processing system H1 Computer H2 Processing device H3 Communication cable M1 Tool locus information dividing means M2 Measuring point arranging means M3 Correction machining range determining means M4 Correction applying means S0 Correction tool locus information creating system S1 CAM system S2 Measuring system T1 Tool locus W1 Workpiece

Claims (6)

In a correction tool path information creation system for creating correction tool path information for correction machining of a workpiece to be machined based on tool path information,
A tool trajectory information dividing unit for creating divided tool trajectory information by dividing the tool trajectory information according to a combination of numerical control command values of the tool trajectory information;
Correction machining range determination means for determining a range in which a dimensional error has occurred among the divided ranges of the divided tool locus information as a correction machining range;
A correction tool trajectory information creation system comprising: The correction tool trajectory information creation system according to claim 1,
And further comprising measurement point arrangement means for arranging measurement points at which the dimensional error of the workpiece is measured on the respective trajectories of the divided range of the divided tool trajectory information.
Feature and correction tool trajectory information creation system. A correction tool trajectory information creation system according to claim 1 or claim 2,
The tool trajectory information dividing means divides the tool trajectory information at a location where the combination of the numerical control command values in the moving direction of the tool trajectory information is switched.
Correction tool trajectory information creation system characterized by this. The correction tool trajectory information creation system according to any one of claims 1 to 3,
The tool trajectory information dividing means divides the tool trajectory information for finishing.
Correction tool trajectory information creation system characterized by this. In a correction tool trajectory information creation method that uses a computer to create correction tool trajectory information for correction processing of a workpiece to be machined based on tool trajectory information,
By dividing the tool path information according to a combination of numerical control command values of the tool path information, create divided tool path information,
A range in which a dimensional error has occurred among the divided ranges of the divided tool trajectory information is determined as a correction processing range;
The correction tool locus | trajectory information creation method characterized by the above-mentioned. In a correction tool trajectory information creation program for causing a computer to create correction tool trajectory information for correction processing of a workpiece machined based on tool trajectory information,
A function of creating divided tool path information by dividing the tool path information according to a combination of numerical control command values of the tool path information;
A function of determining a range in which a dimensional error has occurred in the divided range of the divided tool trajectory information as a corrected machining range;
A program for creating correction tool trajectory information, characterized in that a computer is realized.