JP2002099314A - Non-circular NC machining shape data generation method and apparatus - Google Patents

Abstract

(57) [Problem] To create intermediate data of shape data in units of feed pitch and to create NC processing data. b Creating data on the trajectory of the cutting tool. c To unify shape data with different standards in a short time. d Verification of the processing speed limit should be performed in a short time. e To easily correct visual distortion on the display means. In the given numerical data, the calculation is repeated by using the elliptical data for the radial data and the triangular barycentric data for the axial data to generate the shape data and perform the feed pitch correction processing. 2 It includes means for calculating, displaying, and determining the required torque of the NC processing equipment. (3) A correction means for displaying a shape on the display screen is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for creating non-circular NC data used for machining a non-circular product by a NC machine tool.

[0002]

DESCRIPTION OF THE TERMS In the present invention, the axial direction refers to the feed direction of a machine tool to a work, the radial direction refers to a direction perpendicular to the axial direction, and the axis is usually the same as the work processing axis. The axis of the axial shape data does not always match the axis of the radial shape data, and the profile shape refers to the side edge shape of the axial cross section passing through the axis, and the oval shape refers to the peripheral shape of the radial cross section. The oval-shaped axis is the center of the oval-shaped circumcircle, the oval-shaped reference line is an appropriately determined straight line passing through the axis of the shape,
The ellipse in the calculation of the radial shape data refers to an ellipse centered on the axis of the oval shape and passing through the intersection of the reference line and the circumscribed circle. Therefore, the major axis of the ellipse is on the reference line.

[0003]

2. Description of the Related Art Various types of conventional non-circular NC data generating methods and apparatuses have been considered. An example is disclosed in Japanese Patent Application Laid-Open No. 7-319528. That is, an example of a method of creating NC data of a non-circular shape is to divide numerical data of a product shape given at intervals in a polygonal shape into two numerical data of an axial shape and a radial shape, and as shown in FIG. Four points A, B, C, adjacent to each other in the given axial numerical data
Take D, the four points A, B, C, and BB ₁ = ₁ / 2BC become point _{B 1} on the extension of the line segment AB of D determined, △ BCB
CC ₁ of the center of gravity _{G 1} determined similarly on the extension of the line segment DC
_The point C ₁ where ₁ = ₁ ＝ BC is obtained, and the center of gravity G of △ BCC ₁ is obtained.
₂ calculated, then obtains a middle point between the point G ₁ and the point G _2, the intermediate point and the first-order generation point, for each point that received the previous task of axial numeric data, NC machine tools The process of generating the axial shape data is completed by repeating the process until the shape data for each feed pitch of the machine is obtained. Next, as shown in FIG. Of the points given angles from the line, two points E and F that are adjacent to each other are taken, and the two points E and F between the two points E and F are obtained.
The point is set to N, the diameter difference of the ellipse passing through the point N and the point E is calculated by an equation, and similarly, the diameter difference of the ellipse passing the point N and the point F is calculated. The diameter difference of the ellipse passing through the point N of the angle between E and F is obtained, the distance from the circumscribed circle of the point N on the ellipse is obtained, and the above operation is repeated until the angle 1 ° is obtained, and the radial shape is obtained. The data creation process is completed, the axial shape data and the radial shape data are overlapped to create non-circular shape data, and NC machining shape data for non-circular shape machining is created from the non-circular shape data. .
Further, as an example of the non-circular NC machining shape data generating apparatus, there is an apparatus disclosed in claim 4 of the above-mentioned publication. That is, numerical value input means for inputting numerical data specifying a non-circular shape separately for axial shape numerical data and radial shape numerical data, and processing condition data input means for inputting processing condition data such as cutting speed, feed speed and feed pitch. A non-circular shape data generating operation means for generating non-circular shape data for each of the axial direction and the radial direction based on the input from both of the input means; and a non-circular shape for synthesizing the axial and radial direction-specific shape data from the operation means. Shape data synthesizing means, axial direction corrected shape data,
Correction shape data input means for inputting correction shape data for each radial correction shape, and correction shape data generation calculating means for generating correction shape data for each of the axial direction and the radial direction by input from the correction shape data input means; A correction shape data synthesizing means for synthesizing the correction shape data for each of the axial and radial directions inputted from the correction shape data generating operation means, Final non-circular NC machining shape data creation calculating means for creating machining shape data, non-circular shape display verification means for confirming the final non-circular NC machining shape data before machining, and the final non-circular NC machining shape Means for compressing the final non-circular NC machining shape data from the data creation computing means, Create an NC machining shape data for non-circular by Rino transmission input, a more becomes apparatus with non-circular for NC machining shape data creating means for outputting the NC machine tool.

[0004]

In the above-mentioned conventional method for preparing NC data for a non-circular shape, for example, when the reference in the axial shape is different from the reference in the radial shape, or the reference is gradually changed with the position. In the case of a shape that changes in shape, it is not possible to create a shape, and shape data must be picked up from design drawings and experimental data, and NC data must be created based on that data. there were.

[0005] In addition, the fineness of picking up the shape data greatly affects the processing accuracy. If the picking up of the shape data is rough, the shape accuracy of the product is degraded. There was a problem that the time required to create the shape data also required a long time.

For example, in the case of turning, it is generally considered to increase the number of revolutions in order to reduce the machining time. The amount of movement of the shaft per unit time is increased, and the limit of the number of processing rotations largely depends on the non-circular shape. Therefore, the verification of the limit of the processing rotational speed has to be manually performed from the created shape data, and there is a problem that it takes a long time for the verification.

Further, in the above-described conventional non-circular NC data generating apparatus, the generated shape can be displayed as verification of the generated data. However, a CRT display generally used as a display means is a vertical display. There is a case where there is distortion on the side and the horizontal side. In such a case, for example, despite displaying a perfect circular shape as the radial direction data, it is visually recognized as an ellipse when displayed due to the aforementioned distortion. In some cases, the size of the display (visually) differs depending on the size of the display, and this poses a problem of hindering creation data verification.

[0008]

In order to solve the above-mentioned problems, according to the present invention, the NC of a product having a non-circular shape is provided.
In machining a workpiece by a machine tool, when the reference of the axial shape and the reference of the radial shape of the numerical data specifying a given non-circular shape are different depending on the work part in the axial direction, all the numerical data are the same. The configuration is such that shape data is created by converting the data into a reference, and NC processing data is created from the created data.

According to the second aspect of the present invention, when a workpiece having a non-circular shape is processed by an NC machine tool, a reference for an axial shape and a standard for a radial shape of numerical data for specifying a given non-circular shape are provided. In the method of generating NC machining shape data in which is different depending on the workpiece portion in the axial direction, numerical data of a product shape given at intervals in a polygonal shape is compared with the axial shape data, the radial shape data and the reference of the axial shape. It is divided into reference point change data of the radial shape and numerical data.

[0010] Of the above-mentioned given axial shape data, four points A, B, C and D adjacent to each other on the side edge in the axial direction are taken, and a line is drawn among the four points A, B, C and D. seeking BB ₁ = ₁ / 2BC become point _{B 1} on the extension of the partial AB, △ determined the center of gravity _{G 1} of BCB _1, similarly _CC on the extension of the line segment DC 1 =
1 / 2BC become point seeking _{C 1,} △ determined the center of gravity _{G 2} of BCC _1, then obtains a middle point between the point _{G 1} and the point _{G 2,} and the middle point between the first primary generation point, the aforementioned The operation is repeated until the axial shape data for each feed pitch of the NC machine tool is obtained for each point given the axial shape data, and the first generation processing of the axial shape data is completed.

Next, as numerical data in the radial direction, the distance from the circumscribed circle of the cross section perpendicular to the axis and the angle from the reference line passing through the axis, which is the center of the circumscribed circle, are given at various points on the periphery of the cross section. Take two points E and F that are adjacent to each other,
The point to be determined between the points is defined as N, and the ellipse passing through the point N and the point E among the ellipses of which the major axis is a straight line connecting the intersection of the reference line and the circumscribed circle and the axis with the axis as a center The diameter difference is obtained by the formula, similarly, the diameter difference of the ellipse passing through the point N and the point F is obtained, the distance from the circumscribed circle of the point N on the ellipse passing through N is obtained, Repeatedly obtained for each unit angle, and for each point given numerical data, 3
Iterates until the radial shape data of 60 ° is obtained for each unit angle, completes the primary generation processing of the radial shape data, and superimposes the axial primary creation data and the radial primary creation data. In addition, primary non-circular shape data is created.

Next, among the numerical data of the reference point (core) of the radial shape with respect to the reference of the axial shape, two adjacent data points are set.
A point is taken, an interpolation point is calculated for the feed pitch unit from the two points by interpolation, and the operation is performed for each point given the numerical data of the reference point (core) to generate reference point (core) change data. Complete the process.

Next, radial shape data is extracted from the created primary non-circular shape data, and a work reference point which is a reference of an axial shape is obtained from the extracted data and the reference point (core) change data. Coordinate conversion of the radial shape data based on the (core) is performed, and the coordinate data before the conversion is converted into angle and distance data based on the work reference point (core). The amount of displacement (distance) from the reference diameter passing through the work reference point is calculated for each angle, and the above-described operation is performed for all points of the primary non-circular shape data, and the secondary non-circular shape data creation processing is performed. Complete.

Next, a unit is calculated from the secondary non-circular shape data.
Four points adjacent to each other in the axial numerical data for each angle
Take A, B, C, and D and process the above axial numerical data
Extension line of line segment AB among the four points A, B, C, and D
BB on top₁= Point B where 1 / 2BC₁And BBC₁
Center of gravity G₁, And similarly, on the extension of the line segment DC, CC ₁
= Point C where 1/2 BC₁And BCC₁Center of gravity G₂
And then point G₁And point G₂And the midpoint of
The above operation is used as the secondary generation numerical value as the tertiary generation point.
Axis for each feed pitch of NC machine tool for each point of data
Repeat until the direction shape data is obtained
It repeats to 360 degrees every degree, and the final non-circular shape data
Create.

Further, when converting and creating NC data for non-circular shape processing from the final non-circular shape data, the NC side verifies that the NC data is allowable. Even when the reference (core) of the directional shape and the reference (core) of the radial shape differ depending on the part, the configuration is such that NC data for non-circular shape processing can be created.

According to a third aspect of the present invention, there is provided an apparatus for generating non-circular NC machining shape data, which is a numerical value for specifying a given non-circular shape when a workpiece having a non-circular shape is processed by an NC machine tool. In a non-circular NC machining shape data creating apparatus that calculates and creates NC machining shape data from data, a drive that simulates a driving torque when the NC machine tool is driven by a difference in workpiece machining conditions from the created NC machining shape data. The configuration has a torque simulation means.

According to a fourth aspect of the present invention, the driving torque simulating means in the third aspect of the present invention is a work reference axis of the NC machine tool in a radial section at an arbitrary axial position from the created non-circular shape data. Torque generated around the generating axis of the cross section based on the rotational displacement position of the generating shaft at each rotation angle of the cross-sectional peripheral shape, means for calculating the mean square value of the torque generated in one rotation, and the generated maximum torque, and processing from the calculated torque value And determination means for determining whether or not it is possible.

According to the fifth aspect of the present invention, when a workpiece having a non-circular shape is processed by an NC machine tool, the NC processing for non-circular shape creates NC processing shape data from numerical data specifying a given non-circular shape. The shape data generating device has a display screen for displaying and verifying axial shape data and radial shape data from the generated non-circular NC machining shape data. The display device is provided with a display screen correcting means for correcting the above distortion, and is configured as a non-circular NC processed shape data generating apparatus.

According to a sixth aspect of the present invention, as the display screen correcting means in the fifth aspect of the present invention, there are provided a horizontal line and vertical line length correction value acquiring means for the display screen and a correction display means based on the correction values. Added to the configuration.

[0020]

1 to 17 show a first embodiment to which the invention of claim 1 is applied.

FIG. 3 is a perspective view of the non-circular shape 3 showing an example of the non-circular shape. FIG. 4 shows an axial section 4 as shown by a broken line passing through the axis in FIG. The upper point is P,
Q, A, B, C, D,... The shape of the side edge of the front axial section 4 is referred to as a profile shape.

FIG. 5 shows a section perpendicular to the axis in FIG. 3, that is, a radial section 5, and points on the periphery of the section are indicated by Q, E, F.
... In FIGS. 3 to 5, it is assumed that the point Q is a point on the side edge of the axial section 4 and a point on the peripheral edge of the radial section 5. The peripheral shape of the radial cross section 5 is referred to as an oval shape. 1 is an enlarged view of a portion 1 in an axial section, and FIG. 2 is an enlarged view of a portion 2 in a radial section.

In the embodiment shown in FIGS. 3 to 5, it is assumed that the oval shapes in the radial cross section are similar to each other irrespective of the axial position. That is, it has a single oval shape, and the center of the ellipse is O (0, 0).

The non-circular shape 6 of the second embodiment shown in FIGS. 6 to 9 has a single oval shape as described above. FIG. 6 shows FIG.
8 shows the upper surface 7 of the non-circular shape 6, and FIG. 8 shows the lower surface. The upper surface 7 and the lower surface 8 have similar oval and shapes.

The non-circular shape 10 of the third embodiment shown in FIGS. 10 to 13 is not a single oval shape.
That is, the cross section in the radial direction has a different shape depending on the cutting position where the axial direction is different. In this embodiment, the upper surface 11 is circular as shown in FIG. 11, the lower surface is elliptical as shown in FIG. 12, and the side surface 13 has a continuously changing shape as shown in FIG. The radial cross-sectional shape is a variable oval shape, and there are a plurality of radial cross-sectional shapes.

In the embodiment shown in FIG. 3, numerical data for specifying the oval shape and the profile shape which constitute the non-circular shape 3 is represented by P () in the profile shape shown in FIGS. 1, 3 and 4. A (x ₁ , y ₁ ), B (x ₂ , y ₂ ), C (O, O)
(X ₃ , y ₃ ), D (x ₄ , y ₄ )..., And in the oval shape shown in FIGS. 2, 3, and 5, Q (R ₂ , O) is used as a reference point. E (R ₁ ,
θ ₁ ), F (R ₂ , θ ₂ ),..., and the shape connecting the respective points of the so-called polygonal numerical data provided at intervals is a continuous final non-circular shape. The first non-circular shape data is created by calculating and creating each of the radial shape and the axial shape so as to approach the above, and further superimposing the two shape data.

In the present invention, the calculation method is shown in FIGS.
When trying to obtain a workpiece having a non-circular shape 3 shown in FIG.
The axial shape (profile shape) is first shown in FIG.
As shown in FIG. 5, the shape of the rotating body whose side shape is obtained by rotating the axial shape curve around the axis (therefore, the top surface 1)
5, and the lower surface 16 is calculated as a circular shape 14), and the radial shape (oval shape) is then calculated as shown in FIG.
As shown in FIG. 17, the upper and lower end faces 18 are calculated as elliptical cylinders 17 having the same ellipse shape, and these calculations are performed for each pitch of the machine tool in the axial direction. Non-circular shape data as shown in FIGS. 3 to 5 is created as a stack of elliptical cylinders having different oval shapes.

Next, the structure of the first and second aspects will be described with reference to a fourth embodiment shown in FIGS.

FIG. 18 is a perspective view of a non-circular shape showing an example of a non-circular shape when the center of the axial shape (profile center) and the center of the radial direction (oval center) are different. 1 (cross section 2 which is the upper surface
1), OVAL2 indicates an oval shape 2 which is a cross section 22 perpendicular to the intermediate axis, J indicates the center of the oval shape 1, and H indicates the center of the oval shape 2.

It is assumed that the center H of the oval shape 2 coincides with the center of the axial shape, and the center of the oval between the oval shape 1 and the oval shape 2 is gradually changed. The point E is a point on the non-circular shape in the rotation direction 0 °, the point G is a point on the rotation direction 180 °, and the points E and G are points on the same radial cross section. In this case, the distance from the point E to the point G is set as the reference diameter of the non-circular shape in this embodiment.

FIG. 19 is a top view of the non-circular shape 20 (section 2).
1) is shown, and FIG. 20 is a radial sectional view (section 22) of OVAL2. The radial cross section of the non-circular shape 20 is
The oval shape differs depending on the cutting position, and the oval shape is not similar to each other.

The present invention relates to a method of generating shape data when the profile center and the oval center are different from each other, and performs the following processing. First, assuming that the center of the oval and the center of the profile are the same, the data for specifying the oval shape and the profile shape constituting the non-circular shape 20 is used to generate the shape data by the same processing as the generation of the axial shape data and the radial direction data. Create The shape data created here is non-circular shape data created on the basis that the reference (core) of the oval matches the reference (core) of the profile, and will be referred to as primary non-circular shape data.

Next, conversion processing is performed from the created primary non-circular shape data to shape data in consideration of the deviation of the reference (core) in the following procedure.

First, the center coordinates J and OV of the OVAL1 are described.
From the center coordinates H of AL2, gradually changing center coordinates between OVAL1 and OVAL2 are calculated by interpolation for each feed pitch. In the embodiment of FIG. 18, the center H of the oval shape 2 coincides with the center of the axial shape, and the interpolation calculation is preferably performed on the center of the axial shape.

Next, radial data is extracted from the primary non-circular shape data described above, the radial shape data is offset by the calculated center coordinate value, and coordinate transformation is performed with reference to the profile center. .

The coordinate conversion process will be described with reference to FIG. In the illustrated example, the radial shape is an ellipse (ellipse B) centered on the point O, and the X axis is the major axis of the ellipse B. Point Q (O,
O) is a reference profile center, and a point O (X ₁ ,
Y ₁ ) is the center point (offset value) of the radial shape data with respect to the point Q, the point P (X, Y) is a point on the radial data B based on the point Q, and the circle A is an elliptical radial shape. Data B
(Contact point 23), the radius value is R, the angle between the X-axis of the orthogonal two axes XY passing through the point P and the line segment OP is θ, and the line segment O
Let T be the intersection of the extension line of P and the circumscribed circle A, and C be the distance of the line segment TP. Note that C is known in the creation of the primary shape data described above.

In FIG. 21, when the profile center point Q is set as the reference coordinates, the coordinates (X, Y) of the point P on the radial shape data are X = (RC) × cos θ + X ₁ (6) Y = (RC) × sin θ + Y ₁ (7), and the above calculation is performed for the entire circumference of the radially generated data.

Next, from the coordinates of the calculated point P (X, Y), the distance L of the angle theta ₁ and the line segment PQ forming a rectangular coordinate system through the profile center Q shown in FIG 22 is calculated by the following equation. The above processing is performed for the entire circumference of the illustrated radial direction data B. Note that the point O is not always on the line segment P2.

Based on the angle data calculated in the above-described process and the distance data from the profile center Q, the displacement amount (distance) from the reference point Q is used as a radius value for each unit angle centered on the Q and the entire B is calculated. Ask about Zhou.

FIG. 23 is a diagram showing this processing.
And a circle circumscribing the ellipse B (center point 24).
The contact point 23 and the contact point 24 are different. The radius value R ₀ of the circle D is calculated from the relationship between the ellipse B and the center point Q. P _n from each point store P ₀ on the elliptic B is a point obtained by calculating the distance from the angle and profile center in the processing. The point P ₀ is easy to handle as the contact point 24.

The above processing is repeated up to 360 ° for each radial data input point and for each unit angle, thereby completing the creation processing of the secondary non-circular shape data.

Next, from the above-mentioned secondary non-circular shape data, four points adjacent to each other are taken from the numerical value data in the axial direction for each unit angle, and the axial shape data is generated by the procedure described in 0014. Perform processing.

This process is repeated until the shape data for each feed pitch of the NC machine tool is obtained, and up to 360 ° for each unit angle, thereby completing the process of generating the final non-circular shape data.

The created final non-circular shape data is converted into NC processing data by adding corrected shape data.

In the above-described embodiment, the creation of data of a non-circular shape has been described as an example. However, according to the present invention, as in the sixth embodiment shown in FIGS. It can also be applied to processing data creation when C ₁ and the core C ₂ of the processed shape turning different workpiece.

[0046] Also, as in the seventh embodiment shown in FIGS. 32 34, the center C ₄ different workpiece to be machined hole and the processing time of the rotation center C ₃ of workpiece machining data creation in the case of turning Can also be applied.

Next, the third and fourth aspects of the present invention will be described with reference to the fifth embodiment shown in FIGS. 24 is a perspective view of a non-circular shape showing an example of the non-circular shape. FIG. 25 shows a cross section perpendicular to the axis in FIG. 24, that is, a radial cross section 27, and the periphery of the cross section 27 shows an oval shape. FIG. 26 shows the angle between 0 ° and 36 in the section.
Indicates the amount of diameter reduction for one rotation up to 0 °.

In other words, FIG. 26 shows the amount of displacement of the oval generating shaft from the axis at each rotation angle of the NC processing machine by the displacement line 28. The larger the amount of displacement, the more the machining rotation As the number increases, the generated torque on the oval-shaped generating shaft, which is the shaft center during work processing, increases.

The present invention displays the generated torque of the oval generating shaft of the NC machine at an arbitrary radial section from the generated non-circular shape data, that is, the transition of the driving torque at the time of driving, and generates one rotation. The present invention relates to a non-circular NC machining shape data generating apparatus provided with a simulation unit having a simulation function of calculating a root mean square value of a torque and a maximum generated torque and determining whether machining is possible.

The simulation means will be described below with reference to an example in which a ball screw is used for an oval generating shaft of an NC processing machine.

Based on the created non-circular shape data, displacement data at two adjacent points is extracted from peripheral data (oval data) of an arbitrary radial section.

[0052] The displacement data A, B, t the time required for the displacement, the rotor inertia of the motor _{J m,} the additional inertia and _{J L,} acceleration torque _{T N necessary, T N = (B-A} ) / T / L × 2π / t × (J _m + J _L ) (10), and the above calculation is repeated up to 360 ° for each unit angle.

Next, the calculated acceleration torque is expressed as T _N (N = 1 to
n), the friction torque as _{T f,} the following equation to determine the mean square value _{T ms} torque. Here is a _{t 0 = t 1 + t 2} ····· t n.

The calculated acceleration torque T _N (N = 1 to n) is compared with the maximum torque of the motor, and if the acceleration torque T _N exceeds the maximum torque of the motor, a warning is displayed.
Moreover, compared with the rating of the root mean square T _ms and the motor torque, if the mean square value T _{m s} exceeds the rated torque of the motor, a warning.

That is, the simulation means includes displacement data extracting means, required acceleration torque calculating means, means for calculating the mean square value of torque generated in one rotation, torque generating means for generating maximum torque, comparing means for maximum torque of the motor, and It comprises warning means, means for comparing the mean square value of torque with the rated torque of the motor, and warning means.

FIG. 27 shows a display example of the result of the torque simulation. In this figure, a is position data, b is a graph obtained by plotting a calculation result of the acceleration torque _TN for each unit angle, and c is a root mean square value T _{ms of the} torque.
Is the maximum value of the acceleration torque _TN .

Next, the fifth and sixth aspects of the invention will be described. The present invention relates to a data creation device in which a non-circular shape display verification means having a display screen of a non-circular NC processed shape data creation device is provided with a display screen correction means for correcting distortion on a display. The shape display means of the created non-circular shape data corrects the display (vertical) distortion in the vertical and horizontal directions of the display device. Based on the correction value acquisition means and the acquired correction value, And correction display means for performing correction processing.

Even if the number of dots D is the same, the length of the horizontal line may be visually different from the length of the vertical line. FIG. 28 is an example of the correction value acquiring means, where h is a horizontal reference line displayed on the display device with a known number D of dots, and v is also displayed on the display device with a known number D of dots. Vertical reference line.

[0059] The length L _X of the visual of the displayed horizontal direction of the line and vertical _lines, L _y, for example measured manually by the scale, by the following equation in the horizontal direction by inputting the correction value H _x , a vertical correction value _Hy is calculated. _{H X = L X / D ···} (12) H y = L y / D ··· (13) calculated _{H x} and _{H y} is the length of the visual per dot.

Next, at the time of displaying the shape, the correction display means performs a correction operation of the following equation based on the above-mentioned correction value so as to make it visually match, and then displays the shape. For example, the horizontal direction of the display length of C _X, the vertical direction of the display length of C _y, each number of display dots of the display length of the vertical direction and C _y E _X, E
_y becomes _{E X = C X / H X} ··· (14) E y = C y / H y ··· (15). That is, in order to display the length of the visual C _X is, it is sufficient to display the number of dots E _{X. Cy}
The same is true for

As an example, in the case where the data is a circle but is erroneously recognized as an ellipse on the display device, the correction values H _X and H _y are used to visually _check the coordinates D _X and D _y of the display. , A case of displaying a circle having a radius R will be described.

As shown in FIG. 35, a point D (D
_X , D _y ), and the coordinates T (T _X , T _y ) of an arbitrary point on the circumference having a radius R visually are represented by the following equation: T _x = D _x + R cos θ / H _X (16) T _y = D _y + R sin θ / H _y (17) In the above equations (16) and (17), θ = 0 ゜
By displaying the points obtained up to 360 °, a circle having a radius R is visually displayed. In this example, the length L _X of the visual of the reference _line, to measure the L _y, has been described a method of measuring scale by hand, the camera and the image processing apparatus or the like, the side of the L _X, L _y by sensor May be longer.

[0063]

According to the first aspect of the present invention, in the numerical data for specifying a given non-circular shape, the reference of the axial shape (core) and the reference of the radial shape (core) are the work parts in the axial direction. Therefore, even in a different case, it is possible to create processing data for a non-circle.

According to the second aspect of the present invention, when processing a workpiece having a non-circular shape, the reference of the axial shape and the reference of the radial direction of the numerical data for specifying the given non-circular shape are determined by the work. When it differs depending on the part, the primary processing of the axial shape data, the primary processing of the radial shape data, and the processing of the reference point change data are performed, and then the coordinate conversion is performed based on the workpiece reference point. , Secondary processing to generate final non-circular shape data, and further perform data verification allowed on the NC side, and the reference of the axial shape and the reference of the radial shape of the non-circular shape differ depending on the work site. Also in this case, there is an effect that the NC data for processing a non-circular shape can be created specifically in detail.

According to the third aspect of the present invention, the required torque of the drive source required by the NC processing equipment for generating a shape can be determined from the generated non-circular processing data, and the necessity of the processing conditions set before the processing is recognized. It has the effect of being able to do it.

According to the fourth aspect of the present invention, a specific example of the driving torque simulation means is shown, and the necessary torque of the driving source required for machining the workpiece of the NC machine tool can be understood in detail.
Before machining, an effect is obtained in which it is possible to check in detail whether or not the preset machining conditions are appropriate.

According to the fifth aspect of the invention, in the case of the created non-circular shape, there is an effect that the shape can be displayed without being affected by the distortion of the display screen.

According to the sixth aspect of the present invention, the display screen correcting means of the fifth aspect is specifically shown, and has an effect of making display screen correction easier.

That is, even when the reference (core) of the axial shape and the reference (core) of the radial shape in the given numerical data of the product shape are different, it is possible to easily create the NC processing shape data. Was. Further, since torque simulation of the drive motor of the NC processing machine can be performed from the created shape data, it is possible to easily and quickly determine whether or not processing is possible and to study the optimum processing conditions in a short time. Furthermore, since the display length can be corrected when confirming the shape of the created data, the actual shape and the visual shape can be matched regardless of the display device and without being affected by vertical and horizontal distortions. Can be displayed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a method for creating axial shape data.

FIG. 2 is a schematic explanatory diagram of a radial shape data generation method.

FIG. 3 is a perspective view showing a first example of a non-circular shape.

FIG. 4 is a sectional view taken along the axis of FIG. 3;

FIG. 5 is a sectional view in the radial direction of FIG. 3;

FIG. 6 is a top view in FIG. 7;

FIG. 7 is a perspective view showing a second embodiment of a single oval non-circular shape.

FIG. 8 is a bottom view in FIG.

FIG. 9 is a side view of FIG. 7;

FIG. 10 is a top view of the variable oval non-circular shape shown in FIG. 11;

FIG. 11 is a perspective view showing a third example of a non-circular shape.

FIG. 12 is a bottom view in FIG.

FIG. 13 is a side view of FIG.

FIG. 14 is an explanatory perspective view of a non-circular rotator shape created by axial shape data.

FIG. 15 is a plan view of the same.

FIG. 16 is an explanatory perspective view of a non-circular shape of an elliptical cylinder created in a radial shape.

FIG. 17 is a plan view of the same.

FIG. 18 is a perspective view showing a fourth embodiment of a misalignment oval non-circular shape. .

FIG. 19 is a top view in FIG. 18;

20 is a radial sectional view of OVAL2 in FIG. 18;

FIG. 21 is a schematic explanatory diagram of an oval coordinate conversion method.

FIG. 22 is a schematic explanatory diagram of an oval coordinate transformation method.

FIG. 23 is a schematic explanatory diagram of an oval coordinate conversion method.

FIG. 24 is a perspective view showing a fifth embodiment having a non-circular shape.

25 is a radial cross-sectional view taken along dotted line 27 of the non-circular shape shown in FIG. 24.

26 is a plot of the amount of decrease in diameter in the radial cross section shown in FIG. 25.

FIG. 27 is a torque simulation diagram.

FIG. 28 is an explanatory diagram of display correction showing an example of a correction value acquiring unit.

FIG. 29 is a perspective view showing a sixth embodiment of a non-circular shape in which the rotating core during processing and the core to be processed are different.

FIG. 30 is a plan view of the same.

FIG. 31 is a side view of the same.

FIG. 32 is a perspective view showing a seventh embodiment of a non-circular shape in which the rotary core during processing and the core of the hole to be processed are different.

FIG. 33 is a plan view of the same.

FIG. 34 is a side view of the same.

FIG. 35 is a schematic explanatory diagram of visual correction showing an example of shape display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axial cross section (part) 2 Radial cross section (part) 3 Non-circular shape 4 Axial cross section 5 Radial cross section 6 Non-circular shape 7 Upper surface 8 Lower surface 9 Side surface 10 Non-circular shape 11 Upper surface 12 Lower surface 13 Side surface 14 Non-circular shape 15 Upper surface 16 Lower surface 17 Elliptic cylinder 18 End surface 20 Non-circular shape 21 OVAL1 cross section 22 OVAL2 cross section 23 Contact 24 Contact 26 Non-circular shape 27 Radial cross section 28 Displacement line

Claims (6)

[Claims] When a workpiece having a non-circular shape is machined by an NC machine tool, the reference of the axial shape and the reference of the radial shape of the numerical data for specifying the given non-circular shape are the workpieces in the axial direction. A method for generating non-circular NC processed shape data, characterized in that all numerical data are converted to the same reference to generate shape data, and NC processed data is generated from the generated data, when the data differs depending on the part. 2. An NC machine tool for a product having a non-circular shape.
Identify a given non-circular shape when machining a workpiece
The reference of the axial shape of the numerical data and the radial shape are in the axial direction
NC machining shape data when it differs depending on the work part
In the creation method, given at intervals in a polygonal shape
Numerical data of product shape is converted to axial shape data and radial shape data
Reference point of radial shape to data and reference of axial shape
Divided into numerical data with change data and given axial shape
Points A adjacent to each other on the axial cross-section side edge of the shape data
B, C, and D are taken, and a line segment A among the four points A, B, C, and D is taken.
BB on the extension of B₁= Point B where 1 / 2BC₁,
△ BCB₁Center of gravity G₁, And similarly, an extension of the line segment DC
CC on₁= Point C where 1/2 BC₁And BCC₁
Center of gravity G ₂And then point G₁And point G₂Find the midpoint of
Therefore, the above-mentioned operation is performed in the axial direction
For each point given the shape data, send the NC machine tool
Repeat until the axial shape data for each pitch
To complete the primary creation process of the axial shape data.
Is the circumscribed circle of the section perpendicular to the axis
And the reference line passing through the axis which is the center of the circumcircle
Points of the cross-sectional periphery given an angle from
Then, two points E and F adjacent to each other are taken, and a point to be determined between the two points is obtained.
N, the center line of the axis and the reference line and the external contact
The point N of the ellipse whose major axis is a straight line connecting the intersection and the axis
The diameter difference of the ellipse passing through each point E is obtained by the formula, and
To determine the diameter difference of the ellipse passing through the points N and F, respectively,
Find the distance from the circumscribed circle of point N on the ellipse passing through N,
Is repeated for each unit angle, and
360 ° radial form for each point given value data
Repeat until shape data is obtained for each unit angle.
Completing the primary creation processing of the shape data,
Superimposition of the next generation data and the first generation data in the radial direction
To create the primary non-circular shape data,
Numerical data of the reference point (core) of the radial shape with respect to the shape reference
Two points adjacent to each other are taken and the two points are interpolated.
Calculate the interpolation point of the feed pitch unit from
For each point given in the (core) numerical data,
Complete the creation process of the reference point (core) change data, and then create
The radial shape data from the primary non-circular shape data
And the extracted data and the reference point (core) change data
From the workpiece reference point (core), which is the reference for the axial shape from
Coordinate transformation of the radial shape data
From the data of the target, the angle and angle with respect to the work reference point (core)
And distance data, and from the angle and distance data,
Displacement from the reference diameter passing through the work reference point for each position angle
(Distance) is calculated, and the above operation is performed on the primary non-circular shape data.
Data for all points in the secondary non-circular shape data.
The creation process is completed, and the unit is calculated from the secondary non-circular shape data.
Four points adjacent to each other in the axial numerical data for each angle
Take A, B, C, and D and process the above axial numerical data
Extension line of line segment AB among the four points A, B, C, and D
BB on top₁= Point B where 1 / 2BC₁And BBC₁
Center of gravity G ₁, And similarly, on the extension of the line segment DC, CC₁
= Point C where 1/2 BC₁And BCC₁Center of gravity G₂
And then point G₁And point G₂And the midpoint of
The above operation is used as the secondary generation numerical value as the tertiary generation point.
Data for each point of the NC machine tool
This operation is repeated for each unit angle until the shape data is obtained.
Repeat up to 360 ° to create final non-circular shape data
Then, from the final non-circular shape data, N
When converting and creating C data, NC data allowed on the NC side
Data validation and remove non-
Circular axial shape reference (core) and radial shape reference
Non-circular shape even when (core) differs depending on the part
For non-circular shape that can create NC data for shape processing
NC machining shape data creation method. 3. A non-circular NC machining shape data generating apparatus for generating NC machining shape data from numerical data specifying a given non-circular shape when processing a workpiece having a non-circular shape by an NC machine tool. A driving torque simulation means for simulating a driving torque at the time of driving due to a difference in workpiece processing conditions of the NC machine tool from the generated NC processing shape data. apparatus. 4. A method for simulating a driving torque, comprising the steps of: generating a rotation change for each rotation angle of a cross-section peripheral shape creation axis which is a workpiece reference axis by an NC machine tool at an arbitrary axial position in a radial section from the created non-circular shape data; Calculation means for the generated torque of the cross section based on the position around the generating axis, the root mean square value of the torque generated in one rotation and the generated maximum torque, and the determination means for determining whether or not machining is possible or not based on the calculated torque value. The non-circular NC machining shape data generating apparatus according to claim 3. 5. A non-circular NC machining shape data generating apparatus for generating NC machining shape data from numerical data for specifying a given non-circular shape when a workpiece having a non-circular shape is machined by an NC machine tool. The distortion on the display of the display screen is corrected by the non-circular shape display verification means of the generating apparatus having a display screen for displaying and verifying the axial shape data and the radial shape data from the generated non-circular NC machining shape data. A non-circular NC machining shape data generating apparatus, comprising: 6. The non-circular NC according to claim 5, wherein the display screen correction means includes means for acquiring correction values for the lengths of horizontal and vertical lines of the display screen, and correction display means based on the correction values. Machine for creating processed shape data.