JPH0511823A - Gemerating method for noncircular shape data - Google Patents

Abstract

PURPOSE:To provide the noncircular shape data generating method which can individually control three-dimensional noncircular shape data indicating an ideal shape and a shape error. CONSTITUTION:The data file of a three-dimensional noncircular shape generated by inputting data on >=2 sectional shapes is used as a shape definition file. The data file of a three-dimensional shape error generated by inputting a shape error obtained by measuring respective sectional shapes after work machining is used as a shape error file. The name of the shape definition file indicating the ideal shape when the shape error file is defined is stored in the shape error file. When position command data used for the work machining are generated, the shape definition file name and shape error file name are both specified. The specified shape definition file name and the specified shape definition file name stored in the shape error file are collated with each other to judge whether their combination is proper or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for creating three-dimensional non-round shape data used in a numerical control (hereinafter abbreviated as NC) machine tool for performing non-round shape processing.

[0002]

2. Description of the Related Art An apparatus for realizing a conventional non-perfect circular shape data creating method comprises a shape defining section and a machining data creating section. The shape definition unit can define a three-dimensional non-round shape by giving two or more cross-sectional shapes. That is, with the work attached to the main shaft of the NC lathe, the work rotation axis is the C axis, the rotation center axis is the Z axis, and the axis orthogonal to the X axis is the X axis. The position on the Z axis is fixed and the rotation angle of the C axis is fixed. And the shape represented by the position of the X-axis is assumed to be a cross-sectional shape. Then, the position in the Z-axis direction in the cross section is input, and the component of the position in the X-axis direction in the cross section that is not related to the rotation angle of the C-axis is Xsd.
As a circular data input means, depending on the nature of the cross section,
Four types of input means, that is, an equal angle data input means, an unequal angle data input means, and a function data input means are selected, and the X-axis coordinates are input as relative coordinates Xsl based on the above component Xsd. The above-described function of displaying the input cross-sectional shape data on the graphic screen is started or ended when the cross-sectional shape data is being input or when the input is completed. After inputting the shape data of the first cross section, the second cross section and the third cross section are sequentially
After inputting the shape data of the cross section, and after inputting all the necessary cross-sectional shape data, store each cross-sectional shape data in an external storage device, for example, a floppy disk, and finish the definition of the three-dimensional non-round shape. To do. Further, the processing data creation unit uses the three-dimensional non-round shape defined by the shape definition unit and creates processing data necessary for actual processing by the NC processing machine using a known interpolation function.

The procedure for inputting cross-sectional shape data in such a configuration will be described with reference to the flowchart of FIG. For example, the shape of the milk bottle in FIG. 9 is defined by the three sectional shape data shown in FIG. 10 or 11. In this case section A, Z _A Z-axis coordinate position, Xsd the reference position in the X-axis direction, Xsl relative coordinates from the X-axis reference position Xsd, C indicates the C-axis coordinate rotation angle position. In FIG. 10, all three sectional shapes are divided by the same division number n, and
In, three cross-sectional shapes are divided by the number of divisions n, m, and o, respectively. (A) Step S10: A shape definition file name is set. However, the input file name and output file name can be set here. When the input file name is set, the data in the previously defined shape definition file can be extracted and corrected from the external storage means, for example, a floppy disk. If you do not set the input file name, it will operate assuming that a new shape definition file is created. The output file name does not have to be set here, but can be set in step S60 described later. Input / output of file names and the following key operations are performed using the keyboard. Since the case of inputting the shape of the milk bottle in FIG. 9 is new, nothing is input here. The next step can be reached by pressing the procedure key, which is present on the keyboard.

(B) Step S20; Here, the Z-axis coordinate Z of each section and the reference position Xsd in the X-axis direction are input. The input screen has a structure as shown in FIG. 12, and when there is no input, an "*" mark is displayed to indicate that it is in the initial state. In addition, there is a clear key to return the entered value to the initial state, and the entered value can be erased if necessary. In the section A of FIGS. 10 and 11, Z =
Z _A, Xsd = _{X A} because each _Z A, enter the _{X A.} (C) Step S30; When one set of Z and Xsd is input, the input of shape data of this cross section can be started. It is also possible to input Z and Xsd of the sections B and C in FIG. 10 in advance and start inputting the shape data from an arbitrary section using the cursor key indicating the currently input value. To start inputting the cross-sectional shape data, the following four keys are selected and pressed. Whether or not to input the cross-sectional shape data is actually as described above, and is described in two items on the flowchart.

(D) Step S40: Cross-sectional shape data is input. The following four types (1) to (4) of input forms can be selected depending on the nature of the cross section, and all the keys are present in the keyboard. (1) True circle data input When the input cross section is a perfect circle, the X-axis coordinate can be defined by one point. Therefore, only one Xsl is input. The screen is shown in FIG. 13, and when the end key is pressed after the input, the screen of FIG. 12 is returned. (2) Input of equiangular data When this key is pressed, the screen of FIG. 12 shifts to the screen of FIG. Here, the amount of the equal pitch angle is indicated by No. in the figure. Select by entering the value of. The total number of points is also displayed so that it can be seen how much 360 degrees is divided. Since the cross-section A in FIG. 10 has a shape that is divided into n equal parts, it is sufficient to select the matching one from the table. Then press the procedure key
Move to screen 5. In this example, no. = 3
Enter. In the screen of FIG. 15, 10 ° pitch, 36
Since it is equally divided, the C-axis coordinates are 0 °, 10 °, 20 ° ....
It occurs automatically up to 350 °. Then, Xsl is input according to the section A of FIG. 24 points can be input in one screen, and 24 points or more can be input in the next screen. When the confirmation key is pressed during or after inputting the cross-sectional shape data, the screen in Fig. 16 is displayed. You can check the digit error etc. of the input cross-sectional shape data on the graphic, and press the end key to display the screen in Fig. 15. Return. If the input cross-sectional shape data is incorrect, correct it and press the end key to return to the screen in FIG. In addition, on the screen of FIG. An input of = 0 indicates an initial state, and only inputs other than 0 are accepted.

(3) Input of unequal angle data When this key is pressed, the screen shown in FIG. 17 appears, and all the relative coordinate position Xsl from the C-axis coordinate position and the X-axis reference position Xsd can be input. The advantage of the input by this input means is that a shape is defined in which only a certain range of angles is defined with a fine angle pitch, and the rest is smooth as a whole. In other words, the number of input points can be increased in the part requiring accuracy and the number of unnecessary parts can be reduced. The confirmation of the input cross-sectional shape data is the same as in the case of “(2) Input equiangular data”. After the input is completed, pressing the end key returns to FIG. (4) Function data input When this key is pressed, the screen shown in FIG. 18 appears. Here, an ellipse and an eccentric circle are registered. Input screens for variables that determine the functions of the ellipse and the eccentric circle are shown in FIGS. 19 and 20.
Whichever function is selected, the X-axis coordinate position is defined as a continuous function by a known function formula. After that, as in the case of “(2) Input of equal angle data”, the screen of FIG. 14 appears, the equal angle pitch is determined, and the relative coordinate position Xsl from the X-axis reference position Xsd at each angle is automatically set internally. It is calculated and appears on the screen in the format shown in FIG. (E) Step S50; When the input of the shape data of all the sections is completed as described above, the process proceeds to the next step S60. (F) Step S60: Since the input of the shape data of all the sections has been completed, a file name to be stored in the external storage device is set. After that, when the file creation key is pressed, the file is stored in the external storage device, and the processing of the shape defining unit is ended.
Next, the processed data creating section has a means for performing calculation using a known interpolation function based on the discrete value data, and means for storing the data necessary for the NC processing machine in a floppy disk. , Or has means for sending data to the NC processing machine through a communication interface.

[0007]

In the above-mentioned conventional non-round shape data creation method, the data actually used for processing the non-round shape is based on the three-dimensional non-round shape expressed by numerical data. There is a great advantage that can be created in a short time. However, in the actual processing, there were the following two problems. Work piece distortion Depending on the work piece to be processed with non-round shape, the wall thickness may be thin, and it will be deformed if it is fixed to the main shaft of the processing machine with a chuck or tailstock shaft. Therefore, even if machining is accurately performed using the data created by this non-round shape data creation method, the deformation returns when removed from the spindle, and the shape accuracy of the product after machining deteriorates. Distortion of the processing machine When the non-circular shape is processed, the cam shaft reciprocates at a high speed to generate a strong force and distort the processing machine itself, deteriorating the shape accuracy of the product after processing.

The problems due to these two distortions have been solved by changing the three-dimensional non-round shape data created by the operator by the non-round shape data creating method. However, due to this change, the three-dimensional non-round shape data that should be managed as an ideal shape may be lost, and the management of the three-dimensional non-round shape data representing the ideal shape may be confused thereafter. .. The present invention has been made from the above circumstances,
An object of the present invention is to provide a non-round shape data creation method capable of managing three-dimensional non-round shape data representing an ideal shape.

[0009]

The present invention relates to a method of creating three-dimensional non-round shape data used in an NC machine tool that performs non-round shape processing. The above object of the present invention is to With the workpiece attached to the main axis of the NC machine tool, the workpiece rotation axis is the C axis, the rotation center axis is the Z axis, and the axis orthogonal to the rotation center axis is the X axis, and the position on the Z axis is fixed and A shape represented by a rotation angle of the C-axis and the position of the X-axis is a cross-sectional shape, and a three-dimensional non-round shape data file created by inputting data of two or more cross-sectional shapes is a shape definition file, A three-dimensional shape error data file created by inputting a shape error obtained by measuring the shape for each of the cross-sectional shapes after the work is processed is referred to as a shape error file, and the shape error file is defined. Reason The shape definition file name representing the shape is stored in the shape error file, and both the shape definition file name and the shape error file name are specified when creating the position command data used for the work machining, and the specified shape definition is specified. This is achieved by having a means for comparing the file name with the shape definition file name stored in the specified shape error file to determine the validity of the combination, and managing the ideal shape and shape error in separate files. ..

[0010]

In the present invention, since the ideal shape and the shape error are managed in separate files, it is possible to easily judge the suitability of processing.

[0011]

1 is a perspective view showing the appearance of an apparatus for implementing a method for creating non-round-shape data according to the present invention. A main body 3 having a power switch 1 and two floppy disk drives 2 and a color CRT 4 are shown. , And a keyboard 5 for inputting various command keys and numerical data. The internal structure of the main body 3 is shown in FIG. Main processor 10, RO
M11, RAM12 and various interfaces 13-18
The color CRT 4, the keyboard 5, and the floppy disk drive 2 are attached as peripheral devices. Further, a monochrome / color hard copy 20, a tape reader / puncher 21, and a printer 22 can be additionally connected as required.

First, after processing the shape of the milk bottle of FIG. 9, the shape of the processed milk bottle is measured in order to measure the cross section A, the cross section B, and the cross section C using the cross-sectional shape measuring instrument as shown in FIG. 30 is fixed using center 31 and tailstock 32. However, in FIG. 3, a detent is omitted from the rotation direction. This cross-sectional shape measuring instrument is designed so that the servo motor 3 can position the milk bottle shape 30 at a specified arbitrary angle.
3, the rotation angle detector 34, the rotation angle control unit 40,
Positioning control is performed. The rotation angle control unit 40 has a built-in servo amplifier capable of directly driving the servo motor 33, and the rotation angle command value R from the measurement pattern generation unit 41 for setting the angle pitch amount to be measured in advance.
It has a function of performing positioning in accordance with A, and a function of outputting a positioning completion signal PF to a displacement / rotation angle data processing unit 42, which will be described later, upon completion of positioning and waiting for a preset time before performing the next positioning. .. For the measurement of the cross-sectional shape, the detection signal DR from the rotation angle detector 34 is converted into the rotation angle RS by the rotation angle detection unit 43 and sent to the displacement / rotation angle data processing unit 42, while the shape 3 of the milk bottle 3
An output signal DD from a displacement measuring device 35 for measuring the displacement in the direction orthogonal to the rotation axis of 0 is applied to the displacement DS by the displacement detector 44.
To the displacement / rotation angle data processing unit 42,
This is performed by recording the displacement data and the rotation angle data by the positioning completion signal PF. The movement in the Z-axis direction is performed by providing a guide for moving the displacement measuring instrument 35 in the Z-axis direction and a displacement measuring instrument for measuring the displaced displacement. As described above, the measured values corresponding to the data shown in FIG. 10 or FIG.
The shape error is obtained by subtracting from the data indicated by 1. The procedure of inputting the measured shape error will be described below with reference to the flowchart of FIG.

(A) Step S10A: The name of the shape definition file for defining the shape this time or correcting the shape error is input. Input / output of file names and the following key operations are performed by the keyboard 5. When inputting the shape error of the milk bottle of FIG. 9, the shape definition file name input previously is input. Press the procedure key to proceed to the next step. Here, as will be described later, it is premised that the shape definition file name to be corrected is not input before proceeding to the next step, but there is basically no problem other than this. (B) Step S20A; Here, the screen of FIG. 5 appears, and it is possible to select whether or not to newly define the shape error. If "NO" is selected here, it means that the conventional shape definition has been selected, and since it is exactly the same as step S20 and subsequent steps of the flowchart of FIG. 8, description thereof will be omitted. On the other hand, when “YES” is selected, the screen of FIG. 6 appears and the shape error file name to be input is input. However, here, the input file name and output file name of the shape error can be set, and when the input file name is set, the data in the previously defined shape error file can be extracted and corrected from the external storage means, for example, a floppy disk. If you do not set the input file name, it operates assuming that a new shape error file is created. Therefore, any number of shape error files can be defined for one shape definition file. The output file name does not have to be set here, but can be set in step S60A described later.

(C) Step S30A: When a newly provided shape error definition is selected, a screen having a format as shown in FIG. 12 appears. However, since the shape definition file name entered previously is entered, the Z-axis coordinates and X of section A, section B, and section C are entered.
The reference position Xsd in the axial direction is displayed. Next, it is possible to enter the shape error of any set cross section. To start inputting the actual shape error, the following four keys are selected and pressed. (D) Step S40A: The shape error of the designated cross section is input. The following four types (1) to (4) can be selected depending on the nature of the shape error, and are not affected by the input form of the cross-sectional shape of the shape definition file input previously. (1) Input of constant shape error When the input shape error is constant, the X-axis coordinate can be defined by one point. Therefore, only one Xsle is input. The screen is shown in FIG. 13, and when the end key is pressed after the input, the screen of FIG. 12 is returned.

(2) Shape error equal angle input When this key is pressed, the screen of FIG. 12 shifts to the screen of FIG. Here, the amount of the equal pitch angle is represented by No. in the figure. Select by entering the value of. The total number of points is also displayed so that it can be seen how much 360 degrees is divided. Since the cross-section A in FIG. 10 has a shape that is divided into n equal parts, it is sufficient to select the matching one from the table. After that, when the procedure key is pressed, the screen shown in FIG. 15 is displayed. In this example, no. =
Enter 3. In the screen of FIG. 15, 10 ° pitch, 3
Since it is divided into 6 parts, the C-axis coordinate is 0 °, 10 °, 20 ° ....
It occurs automatically up to 350 °. Input Xsle according to the section A of FIG. 10 below. 24 points can be input in one screen, and 24 points or more can be input in the next screen.
When the confirmation key is pressed during or after inputting the shape error,
Screen is displayed, and the digit error of the entered shape error can be confirmed on the graphic.
Return to the screen. If the entered shape error is incorrect, correct it and press the end key to return to the screen in FIG. Incidentally, FIG.
No. 4 on the screen An input of = 0 indicates an initial state, and only inputs other than 0 are accepted.

(3) Input of non-uniform angle of shape error When this key is pressed, the screen of FIG. 17 appears, and the relative coordinate position Xsl from the C-axis coordinate position and the X-axis reference position Xsde.
You can enter all e. The confirmation of the input shape error is the same as in the case of “(2) Input of shape error equal angle”. After the input is completed, pressing the end key returns to FIG. (4) Input of shape error function When this key is pressed, the screen of FIG. 18 appears. Here, an ellipse and an eccentric circle are registered. Input screens for variables that determine the functions of the ellipse and the eccentric circle are shown in FIGS. 19 and 20.
Whichever function is selected, the X-axis coordinate position is defined as a continuous function by a known function formula. Then, as in the case of “(2) Input of geometrical error equal angle”, the screen of FIG. 14 appears, the equiangular pitch is determined, and the geometrical error Xsle at each angle is automatically calculated internally, as shown in FIG. Will appear on the screen in various formats. This is very convenient when the shape error pattern is almost functional and only the part that is out of the function is re-input later. (E) Step S50A; When the input of the shape errors of all the sections is completed as described above, the process proceeds to the next step S60A.

(F) Step S60A: Since the input of the shape error of all the sections is completed, the shape error file name to be stored in the external storage device is set as the output file name. After that, when the file creation key is pressed, the file is stored in the external storage device, and the processing of the shape error definition unit ends. Next is the machining data creation unit. If only the shape definition file name is specified in this machining data creation unit, a known interpolation function is already created based on the cross-sectional shape data in the shape definition file, just as in the conventional technique. Interpolation calculation is used to create the necessary data on the NC processing machine. If both the shape definition file name and the shape error file name are specified, the data in the shape error file from the data obtained by the interpolation calculation using the known interpolation function based on the cross-sectional shape data in the shape definition file Data obtained by interpolation calculation using a known interpolation function based on the shape error is subtracted between the same coordinate positions to create processing data necessary for the NC processing machine. However, in this embodiment, since the shape error file name is specified after inputting the shape definition file name to be corrected in advance, when specifying both the shape definition file name and the shape error file name, it is determined whether the combination is correct or not. It is possible to check the operation to prevent erroneous operation.

The above-described embodiment is a method in which the values of Z and Xsd in the shape definition file created previously cannot be changed. Therefore, when the shape definition file created previously is composed of 10 cross sections, the number of input cross sections of the shape error file is always 10 cross sections. Another example is as follows. The cross-sectional shape measuring instrument of FIG. 3 is also provided with a function of performing an interpolation calculation using the interpolation function used to create the machining data based on the cross-sectional shape data in the shape definition file, and the Z-axis other than that shown in FIG. Even if the shape is measured at the position in the direction, the ideal shape can be known, so that the shape error can be obtained. This means that the Ze and Xsde values in the shape error file can be set without being affected by the Z and Xsd values in the previously created shape definition file. Therefore, even if the previously created shape definition file has 10 cross sections, the number of input cross sections of the shape error file is not necessarily 10 cross sections in this embodiment. The flowchart in this case is shown in FIG. 7, but since it is almost the same as the flowchart in FIG. 4, only the added steps will be described here. What is added is step S20B, and the values of the Z-axis coordinate position Z and the reference position Xsde in the X-axis direction at the cross-sectional position of the input shape error can be set.

[0019]

As described above, according to the non-round shape data creation method of the present invention, it is possible to prevent the loss of the three-dimensional non-round shape data representing the original ideal shape. It is possible to appropriately manage the three-dimensional non-round data representing the shape. In addition, even if the shape error is three-dimensional, it can be easily deleted, and the ideal shape and the shape error can be managed as separate files, so it is easy to process the same shape after setup and replacement, or at the same time with different processing machines. Can handle. In addition, ordinary roundness machining is performed on a workpiece that has a relatively small amount of non-roundness and the distortion of the processing machine itself can be almost ignored, and the amount of non-roundness that is distorted by the pressure of the chuck or the tailing is measured. It is also possible to create a shape error file before performing non-round machining.

[Brief description of drawings]

FIG. 1 is an external perspective view of an apparatus that realizes a non-round shape data creation method of the present invention.

FIG. 2 is a block diagram showing an example of a main part of the device of the present invention shown in FIG.

3 is a diagram showing a cross-sectional shape measuring instrument used in the device of the present invention shown in FIG.

FIG. 4 is a flowchart illustrating a first operation example of the method of the present invention.

FIG. 5 is a diagram showing an example of a screen display according to the method of the present invention.

FIG. 6 is a diagram showing another example of screen display according to the method of the present invention.

FIG. 7 is a flowchart illustrating a second operation example of the method of the present invention.

FIG. 8 is a flowchart illustrating an operation example of a conventional non-round shape data creation method.

FIG. 9 is a perspective view showing an example of a three-dimensional model.

FIG. 10 is a diagram showing an example of ideal workpiece cross-sectional shape data.

FIG. 11 is a diagram showing another example of ideal workpiece cross-sectional shape data.

FIG. 12 is a diagram showing a first example of screen display by a conventional method.

FIG. 13 is a diagram showing a second example of screen display according to a conventional method.

FIG. 14 is a diagram showing a third example of screen display by a conventional method.

FIG. 15 is a diagram showing a fourth example of screen display according to a conventional method.

FIG. 16 is a diagram showing a fifth example of screen display by a conventional method.

FIG. 17 is a diagram showing a sixth example of screen display according to a conventional method.

FIG. 18 is a diagram showing a seventh example of screen display by a conventional method.

FIG. 19 is a diagram showing an eighth example of screen display according to a conventional method.

FIG. 20 is a diagram showing a ninth example of screen display according to the conventional method.

[Explanation of symbols]

 3 Body 4 Color CRT 5 Keyboard

Claims (1)

Claims: 1. A workpiece rotation axis is a C-axis and a rotation center axis is Z when a workpiece is attached to a spindle of a numerically controlled machine tool.
An axis, an axis orthogonal to the rotation center axis thereof is defined as an X axis, a position on the Z axis is fixed, and a shape represented by a rotation angle of the C axis and a position of the X axis is a cross-sectional shape. A three-dimensional non-circular data file created by inputting the cross-sectional shape data is a shape definition file, and by inputting the shape error obtained by measuring the shape for each cross-sectional shape after the work machining. The created three-dimensional shape error data file is called a shape error file, and a shape definition file name representing an ideal shape when defining the shape error file is stored in the shape error file and used for the work machining. Specify both the shape definition file name and the shape error file name when creating the position command data to be stored in the specified shape definition file name and the specified shape error file. Non-round shape data generation method characterized in that by matching the shape definition file name has a means for determining the propriety of the combination, to manage the ideal shape and the shape error in a separate file.