JP2005305579A - Control method and controller for nc machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method and a controller by which operability of an operator can be improved and a rotating feed axis can be quickly and accurately indexed when an inclined face of a workpiece is machined by a five-axis NC machine tool. <P>SOLUTION: At least a normal vector of the inclined face in inclined face coordinates is inputted from a data input part 23. At least an indexing angle of two rotating feed axes, by which the inclined face becomes vertical to the axis line of a main spindle, is calculated by a calculation part 27 and displayed on a calculation result display part 29. A machine driving part 35 is driven after an indexing angle command is transmitted to an NC device 33 from a rotating indexing command part 31. Then, the inclined face becomes perpendicular to the axis line of the main spindle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an NC machine tool having five or more axes having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis. The present invention relates to a control method and a control apparatus for an NC machine tool that indexes a rotary feed shaft so that an inclined surface set on a workpiece is perpendicular to a main axis, and performs machining on the inclined surface using a linear feed shaft after indexing.

  For example, relative linear feed of the X, Y, and Z axes is performed between the vertical spindle and the table base, and the B axis and rotary feed shafts around the Y axis are rotated on the table base. In a 5-axis NC machine tool having a table that can be rotated and fed by a certain C-axis, a case is considered in which machining is performed with a tool attached to the spindle on the inclined surface of a workpiece fixed to the table. At this time, the B axis and C axis are indexed and positioned so that the inclined surface of the workpiece and the axis of the main axis are perpendicular to each other, and then, based on the inclined surface coordinate system in which the inclined surface of the workpiece is the XY plane. In general, so-called 5-axis indexing is performed, in which an inclined surface of a workpiece is processed by a programmed NC program. A recent NC apparatus has a function of automatically performing the 5-axis indexing process.

  In order to use the function of automatically performing the 5-axis indexing process, it is necessary to obtain the Euler angle representing the posture of the inclined surface in advance and input the value. Therefore, the function of the 5-axis NC machine tool disclosed in Patent Document 1 is disclosed in which the position of the reference point of the work after indexing the rotary feed axis is calculated. The Euler angle is obtained by hand calculation from the position of the reference point of the workpiece after indexing the rotary feed axis obtained by the function of Patent Document 1.

Japanese Patent Publication No. 6-88192

  Although the method for obtaining the Euler angle is simply calculated by hand, the calculation is complicated and there is a risk of causing a calculation error. In the method using the CAM device, the device becomes large and the input work is troublesome. In addition, the function for automatically performing the conventional 5-axis indexing processing is such that the coordinate value of the current position of each feed axis in the inclined plane coordinate system is displayed only when this function is ON, and manually. When processing the inclined surface, it is not displayed and the operator is inconvenient.

  Therefore, the present invention has a technical problem to solve such problems of the prior art, and the rotary feed shaft is indexed by an NC machine tool having five or more axes including two or more rotary feed shafts. It is an object of the present invention to provide an NC machine tool control method and control device that can perform indexing processing for processing an inclined surface quickly and accurately with less burden on the operator.

  In order to achieve the above object, according to the present invention, three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis, and C axis In a control method of an NC machine tool for processing the workpiece by indexing and positioning the rotary feed shaft of an NC machine tool having a workpiece and performing a relative feed operation between a workpiece fixed on a table and a tool mounted on a spindle , And inputting at least a normal direction vector out of a normal direction vector and a tangential direction vector of the inclined surface in an inclined surface coordinate system in which an inclined surface set on the workpiece is an XY plane, and the inclined surface is an axis of the main axis. Less than the index angle of the two rotary feed axes that are perpendicular, the rotation angle around the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and the variables that define the inclined plane coordinate system Also the determined by calculation index angle of two rotational feed axes, obtained the two rotational feed axes NC machine tool control method to display the value of the index angle is provided.

  By inputting at least the normal direction vector in the inclined plane coordinate system, the index angle of the two rotary feed axes whose inclined plane is perpendicular to the axis of the main axis can be obtained by calculation, and the index angle of the calculation result is displayed To do. The operator can know the indexing angle, manually index the rotary feed shaft, and make the inclined surface perpendicular to the axis of the main shaft.

  Further, according to the present invention, the NC machine tool having three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of the A axis, B axis, and C axis. In an NC machine tool control method for machining a workpiece by indexing and positioning a rotary feed shaft and performing a relative feed operation between a workpiece fixed on a table and a tool mounted on a spindle, an inclined surface set for the workpiece The at least two normal feed vectors are input from the normal direction vector and the tangential direction vector of the inclined plane in the inclined plane coordinate system with XY plane as the XY plane, and the two rotational feeds in which the inclined plane is perpendicular to the axis of the main axis At least the two rotation feed axes among the index angle of the axis, the rotation angle about the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and the variable defining the inclined plane coordinate system An indexing angle is obtained by calculation, the two rotary feed shafts are indexed to the obtained index angle so that the inclined surface is perpendicular to the axis of the main shaft, and the inclined feed surface can be processed by the linear feed shaft. A method for controlling an NC machine tool is provided.

  Similar to the control method of the NC machine tool described above, the index angle of the two rotary feed shafts whose inclined surfaces are perpendicular to the axis of the main shaft can be obtained by calculation, and the NC angle can be obtained via the NC device so that the calculated index angle is obtained. Issue indexing commands to the two rotary feed axes. Then, the two rotary feed axes of the NC machine tool are indexed, and the NC machining by the linear feed axes in the inclined plane coordinate system can be automatically advanced.

  Moreover, according to the present invention, an NC machine tool having three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis, and C axis. In the NC machine tool control method for machining the workpiece by indexing and positioning the rotary feed shaft and performing a relative feed operation between the workpiece fixed on the table and the tool mounted on the spindle, the inclination set for the workpiece A normal direction vector and a tangential direction vector of the inclined surface in the inclined surface coordinate system having the surface as the XY plane are input, and the origin coordinate value of the inclined surface coordinate system and the two rotations in the machine coordinate system of the NC machine tool A coordinate value representing the rotation center position of the feed shaft is further input, and the index angle of the two rotary feed shafts, the workpiece coordinate system, and the tilt surface coordinate system, where the inclined surface is perpendicular to the axis of the main shaft. XY plane A rotation angle around the Z axis and a variable defining the inclined plane coordinate system are obtained by calculation, and the two rotary feed axes are indexed to the calculated index angle so that the inclined plane is perpendicular to the axis of the main axis. There is provided a control method for an NC machine tool that calculates and displays the coordinate value of the current position of each feed axis in the tilt plane coordinate system, and enables machining on the tilt plane by the linear feed axis.

  By performing a predetermined calculation based on the input data, the index angle of the two rotary feed axes where the inclined surface is perpendicular to the axis of the main axis, and the Z axis in the XY plane of the workpiece coordinate system and the inclined surface coordinate system The variables defining the tilt angle coordinate system of the rotation angle, Euler angle or roll angle, pitch angle, and yaw angle are obtained. From these calculation results and the input data, the coordinate value of the current position of each feed axis in the inclined plane coordinate system is calculated momentarily and displayed. The operator can recognize the processing state or perform manual processing by viewing the display.

  Further, according to the present invention, the NC machine tool having three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of the A axis, B axis, and C axis. An inclined surface set for the workpiece in an NC machine tool control apparatus for processing the workpiece by indexing and positioning the rotary feed shaft and performing a relative feed operation between the workpiece fixed on the table and the tool mounted on the spindle. A data input unit for inputting at least the normal direction vector of the normal direction vector and the tangential direction vector of the inclined plane in the inclined plane coordinate system with the XY plane as the XY plane, and the inclined plane is perpendicular to the axis of the main axis At least the index angle of the two rotary feed axes, the rotation angle around the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and the variable defining the inclined plane coordinate system One and calculator for calculating the index angle of the rotary feed shaft of the control device of the NC machine tool having a display unit for displaying the value of the index angle of the calculated said two rotary feed axis is provided.

  Further, according to the present invention, the NC machine tool having three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of the A axis, B axis, and C axis. An inclined surface set for the workpiece in an NC machine tool control apparatus for processing the workpiece by indexing and positioning the rotary feed shaft and performing a relative feed operation between the workpiece fixed on the table and the tool mounted on the spindle. A data input unit for inputting at least the normal direction vector of the normal direction vector and the tangential direction vector of the inclined plane in the inclined plane coordinate system with the XY plane as the XY plane, and the inclined plane is perpendicular to the axis of the main axis At least the index angle of the two rotary feed axes, the rotation angle around the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and the variable defining the inclined plane coordinate system A calculation unit for calculating the index angle of the two rotation feed shafts, and the NC device so that the two rotation feed shafts are indexed to the calculated index angle so that the inclined surface is perpendicular to the axis of the main shaft. There is provided a control device for an NC machine tool including a rotation index command unit for sending an index command.

  Further, according to the present invention, the NC machine tool having three linear feed axes of X axis, Y axis, and Z axis orthogonal to each other and at least two rotary feed axes of the A axis, B axis, and C axis. An inclined surface set for the workpiece in an NC machine tool control apparatus for processing the workpiece by indexing and positioning the rotary feed shaft and performing a relative feed operation between the workpiece fixed on the table and the tool mounted on the spindle. A data input unit for inputting a normal direction vector and a tangential direction vector of the inclined surface in the inclined surface coordinate system with XY plane as an origin, and an origin coordinate value of the inclined surface coordinate system in the machine coordinate system of the NC machine tool A storage unit that pre-inputs and stores the coordinate value of the rotation center position of the two rotary feed shafts in the machine coordinate system of the NC machine tool, and the two inclined surfaces are perpendicular to the axis of the spindle A calculation unit that calculates an index angle of the transfer axis, a rotation angle about the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and a variable that defines the inclined plane coordinate system; A rotation index command unit for indexing the two rotary feed shafts at a predetermined index angle and sending an index command to the NC unit so that the inclined surface is perpendicular to the axis of the main shaft; and an input from the data input unit An inclined plane coordinate system current position calculation unit that calculates a coordinate value of a current position of each feed axis in the inclined plane coordinate system from the data stored in the storage unit and the calculated data in the inclined plane coordinate system A control device for an NC machine tool including a display unit that displays the coordinate value of the current position of each feed axis is provided.

According to the present invention, when the operator inputs at least only the normal direction vector of the inclined surface, the index angle of the two rotary feed shafts whose inclined surface is perpendicular to the axis of the main shaft is obtained by calculation thereafter. . If this calculation result is displayed on the display unit, the operator can manually move the two rotary feed shafts so that the inclined surface is perpendicular to the axis of the main shaft, and the inclined surface can be manually processed.
Also, by commanding the calculation result to the NC device, the two rotary feed shafts are indexed and positioned so that the inclined surface is perpendicular to the axis of the main shaft, and NC processing is performed by the linear feed shaft in the inclined surface coordinate system. be able to.
Furthermore, since the coordinate value of the current position of each feed axis in the inclined plane coordinate system can be calculated and displayed every moment based on the input data and the calculation result, the operator can check the machining state by checking the display or manually Can be processed.

  In this way, if a value obtained relatively easily from a workpiece drawing, CAD data, or workpiece measurement data, such as a normal direction vector or a tangential direction vector in an inclined plane coordinate system, is input, a complicated CAM device or a large-scale CAM device has been conventionally achieved. Indexing angles of the two rotary feed axes that needed to be adjusted, rotation angles around the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system, and tilts that are Euler angles or roll angles, pitch angles, and yaw angles Since variables defining the surface coordinate system are calculated quickly and accurately, the workability of the inclined surface indexing process by the operator is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an NC machine tool and its control device according to the present invention, FIG. 2 is a flowchart showing a first embodiment of the NC machine tool control method according to the present invention, and FIG. 3 shows the NC machine tool of the present invention. FIG. 4 is a partial perspective view showing the machine configuration of the feed shaft of the NC machine tool of the present invention, and FIG. 5 is a machine used in the NC machine tool control method of the present invention. It is explanatory drawing which shows the relationship between a coordinate system, a workpiece | work coordinate system, and an inclined surface coordinate system, (a) shows before indexing, (b) shows after indexing. FIG. 6 is an example of the input and display screen of the NC machine tool controller of the present invention, and FIG. 7 shows the coordinate values of the current position of each feed axis in the inclined plane coordinate system of the NC machine tool controller of the present invention. It is an example of the display screen to display.

  First, the machine configuration of the NC machine tool used in the embodiment of the present invention will be described with reference to FIG. The spindle 1 of the NC machine tool is a vertical spindle, and can be rotated by mounting a tool 3 downward. In the rotary feed shaft device, a rotary table 7 that is rotated and positioned in the C-axis direction around an axis 5 parallel to the axis of the main shaft 1 has a rotary table 7 in the B-axis direction around a horizontal axis 9 parallel to the Y-axis. It is provided on a table tilting table 11 to be tilted and positioned. The main shaft 1 and the table tilting table 11 can be relatively linearly fed in the three axis directions of the X axis, the Y axis, and the Z axis. The NC machine tool of the present embodiment has this 5-axis configuration. The workpiece W is fixed on the rotary table 7, the B-axis and the C-axis are indexed and positioned, and the X, Y, Z between the tool 3 and the workpiece W are determined. The workpiece is processed into a desired shape by axial relative feed.

Next, the concept of processing the inclined surface S of the workpiece W will be described with reference to FIG. First, as shown in (a), the rotary table 7 is set to a horizontal reference posture (B-axis 0 °, C-axis 0 °), and the workpiece W is fixed thereon. The machine coordinate system X, Y, Z and the workpiece coordinate system X ₁ , Y ₁ , Z ₁ are designated. The machine coordinate system and the workpiece coordinate system have the same direction vector. An inclined plane coordinate system X ₂ , Y _2, Z ₂ is set on the inclined plane S to be machined of the workpiece W. The Z ₂ axis of the inclined plane coordinate system is perpendicular to the inclined plane S, and the X ₂ axis and the Y ₂ axis can be arbitrarily set on the inclined plane S.

When processing the inclined surface S, as shown in (b), the B axis is rotated by α and the C axis is rotated by β so that the inclined surface S is perpendicular to the axis of the main shaft 1. The Z ₂ axis of the inclined plane coordinate system after the rotation feed is parallel to the Z axis of the machine coordinate system and the Z ₁ axis of the workpiece coordinate system. The X ₂ Y ₂ axis of the inclined plane coordinate system generally does not coincide with the XY axis of the machine coordinate system or the X ₁ Y ₁ axis of the workpiece coordinate system, and rotates around the Z ₂ axis by an angle γ. The NC program for machining the inclined surface S is created in the inclined surface coordinate system, so the values described in the NC program are converted into values in the inclined surface coordinate system by calculation based on the angles α, β, and γ. As a result, it is understood that the actual processing may be performed.

The configuration of the NC machine tool and the control device of this embodiment will be described with reference to FIG. Normal vector of the inclined surface coordinate system, i.e. the vector and representing the Z ₂ direction, the tangential direction vector, that is the data input unit 23 for inputting a vector representing the direction X ₂ or Y ₂ direction is provided. Stores the position of the rotary feed axis on the machine coordinate system, that is, the coordinate value data of the B-axis center 9 on the XZ plane and the coordinate value data of the C-axis center 5 on the XY plane, or the center shift amount of the rotary feed axis, Since the B-axis center 9 and the C-axis center 5 do not exactly coincide with each other, a storage unit 25 is provided for storing the deviation amount and the like in advance. From the data input from the data input unit 23 and the data in the storage unit 25 by the calculation start command unit 21, the index angles α and β of the rotary feed shaft at which the inclined surface S is perpendicular to the axis of the spindle 1, and the Euler angle A calculation unit 27 for calculating the rotation angle γ around the Z axis in the XY plane of the workpiece coordinate system and the inclined plane coordinate system is provided, and a calculation result display unit 29 for displaying the calculation result is provided in the subsequent stage.

The calculation results of the rotation feed shaft index angles α and β are sent to the rotation index command unit 31, and an index command is sent to the NC device 33 to drive the mechanical drive unit 35 of the rotary feed shaft.
On the other hand, after the inclined surface S becomes perpendicular to the axis of the spindle 1 based on the data of the data input unit 23, the data of the storage unit 25, the calculation result of the calculation unit 27, and the coordinate information sent from the NC device 33, An inclined surface coordinate system current position calculation unit 37 that calculates the coordinate value of the current position of each feed axis in the inclined surface coordinate system is provided, and an inclined surface coordinate system current position display unit 39 is provided at the subsequent stage.

A control method according to the first embodiment will be described with reference to FIGS. The normal direction vector of the inclined plane coordinate system is calculated from the machining drawing of the workpiece W, CAD data, workpiece measurement data, etc., and the components a ₁ , b ₁ , c ₁ in the three-axis directions are calculated from the dedicated screen shown in FIG. Enter in the form. Similarly tangential vector, for example, the X ₂ axis direction of the vector components _{a 2, b 2, c 2} , and inputs in the form of. Further, the designation of the work coordinate system as the base of the inclined plane coordinate system is input as G54, for example. Input the origin coordinate values of the inclined plane coordinate system as l ₁ , m ₁ , n ₁ . The above is step S1. Here, the calculation start switch 41 is turned on (step S2). The storage unit 25 stores in advance data on the type of NC machine tool, that is, the rotary type of the rotary feed shaft on the spindle side, the rotary table on the table side as shown in FIG. Is stored and read out. The name of the rotary feed axis, for example, the B axis or the C axis, which may be the A axis depending on the NC machine tool, the name of the rotary feed axis is also stored and read out. The position of the rotary feed axis on the machine coordinate system and the center shift amount of the rotary feed axis are also stored and read out. The coordinate value of the current position in the machine coordinate system is also read from the NC device 33 every moment. The above is step S3.

Then, in the calculation unit 27, the indexing angles α and β of the rotary feed shaft where the inclined surface S is perpendicular to the axis of the main shaft 1, the Euler angles I, J and K, and the XY plane of the workpiece coordinate system and the inclined surface coordinate system. The rotation angle γ around the Z axis and the origin coordinate value of the inclined plane coordinate system after the rotation feed axis indexing are calculated (step S4). These calculation results are displayed on the calculation result display unit 29 in the form shown in the lower part of FIG. 6 (step S5). The operator knows the indexing angles α ₁ and β ₁ of the rotary feed shaft, and rotationally indexes the B and C axes to make the inclined surface S perpendicular to the axis of the main shaft 1 (step S6). The coordinate value of the current position of each feed axis in the inclined plane coordinate system is calculated from the machine information and coordinate information in step S3 and the Euler angle calculated in step S4 (step S7), and the results are shown in FIG. Is displayed on the dedicated screen (step S8).

Next, the control method of the second embodiment will be described with reference to FIG. This embodiment shows a procedure when the Euler angle is known by a CAM device or the like. First, the Euler angles I, J, and K, the designation of the workpiece coordinate system as the base of the inclined plane coordinate system, and the origin coordinate value of the inclined plane coordinate system are input from the dedicated screen shown in FIG. 6 (step S11). Then, the calculation start switch 41 is turned on (step S12). Next, as in step S3 in FIG. 2, the NC machine tool type, the name of the rotary feed shaft, the position of the rotary feed shaft on the machine coordinate system, and the center shift amount of the rotary feed shaft are input. Further, the coordinate value of the current position in the machine coordinate system is also read from the NC device 33 (step S13). In the calculation unit 27, the indexing angles α and β of the rotary feed shaft where the inclined surface S is perpendicular to the axis of the main shaft 1, the rotation angle γ around the Z axis in the XY plane between the workpiece coordinate system and the inclined surface coordinate system, and rotation The origin coordinate value of the inclined plane coordinate system after indexing the feed axis is calculated (step S14). These calculation results are displayed on the calculation result display unit 29 in the form shown in the lower part of FIG. 6 (step S15). The operator knows the indexing angles α ₁ and β ₁ of the rotary feed shaft, and rotationally indexes the B and C axes to make the inclined surface S perpendicular to the axis of the main shaft 1 (step S16). The coordinate value of the current position of each feed axis in the inclined plane coordinate system is calculated from the machine information and coordinate information in step S13 and the Euler angle input in step S11 (step S17), and the results are shown in FIG. Is displayed on the dedicated screen (step S18).

  Thus, instead of the normal direction vector and the tangential direction vector of the inclined plane coordinate system, even if the Euler angle is known, the index angle of the rotary feed shaft that makes the inclined plane S perpendicular to the axis of the main shaft 1 Even when the inclined surface S is manually processed, since the coordinate value of the current position of each feed axis in the inclined surface coordinate system is displayed momentarily, the operator's workability is improved.

It is a block diagram of the configuration of the NC machine tool and its control device of the present invention. It is a flowchart which shows 1st Embodiment of the control method of NC machine tool of this invention. It is a flowchart which shows 2nd Embodiment of the control method of NC machine tool of this invention. It is a fragmentary perspective view which shows the machine structure of the feed shaft of NC machine tool of this invention. It is explanatory drawing which shows the relationship between the machine coordinate system used with the control method of NC machine tool of this invention, a workpiece | work coordinate system, and an inclined surface coordinate system. It is an example of the input and display screen of the control apparatus of the NC machine tool of the present invention. It is an example of the display screen which displays the coordinate value of the present position of each feed axis in the inclined plane coordinate system of the control device of the NC machine tool of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle 3 Tool 7 Rotary table 11 Table tilt table 23 Data input part 25 Storage part 27 Calculation part 29 Calculation result display part 31 Rotation index command part 33 NC apparatus 37 Inclined surface coordinate system present position calculating part 39 Inclined surface coordinate system present Position display part S Inclined surface W Workpiece

Claims (6)

Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis In a control method for an NC machine tool for machining a workpiece by performing a relative feed operation between a workpiece fixed to a table and a tool attached to a spindle,
Input at least a normal direction vector of the normal direction vector and the tangential direction vector of the inclined surface in the inclined surface coordinate system in which the inclined surface set to the workpiece is an XY plane,
Index angle of the two rotary feed shafts where the inclined surface is perpendicular to the axis of the main axis, rotation angle around the Z axis in the XY plane between the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinates Calculating at least the indexing angles of the two rotary feed axes among the variables defining the system;
A control method for an NC machine tool, wherein the obtained index angle values of the two rotary feed axes are displayed. Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis In a control method for an NC machine tool for machining a workpiece by performing a relative feed operation between a workpiece fixed to a table and a tool attached to a spindle,
Input at least a normal direction vector of the normal direction vector and the tangential direction vector of the inclined surface in the inclined surface coordinate system in which the inclined surface set to the workpiece is an XY plane,
Index angle of the two rotary feed shafts where the inclined surface is perpendicular to the axis of the main axis, rotation angle around the Z axis in the XY plane between the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinates Calculating at least the indexing angles of the two rotary feed axes among the variables defining the system;
Indexing the two rotary feed shafts to the determined index angle and making the inclined surface perpendicular to the axis of the spindle;
A control method for an NC machine tool, wherein machining with respect to the inclined surface is enabled by the linear feed shaft. Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis In a control method for an NC machine tool for machining a workpiece by performing a relative feed operation between a workpiece fixed to a table and a tool attached to a spindle,
Input a normal direction vector and a tangential direction vector of the inclined plane in the inclined plane coordinate system in which the inclined plane set for the workpiece is an XY plane,
Further input an origin coordinate value of the inclined plane coordinate system and a coordinate value representing the rotation center position of the two rotary feed axes in the machine coordinate system of the NC machine tool,
An indexing angle of the two rotary feed shafts in which the inclined surface is perpendicular to the axis of the main axis, a rotation angle around the Z axis in the XY plane of the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinate system Find the variable to be defined by calculation,
Indexing the two rotary feed shafts to the determined index angle and making the inclined surface perpendicular to the axis of the spindle;
Calculate and display the coordinate value of the current position of each feed axis in the inclined plane coordinate system,
A control method for an NC machine tool, wherein machining with respect to the inclined surface is enabled by the linear feed shaft. Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis And a control device for an NC machine tool for machining the workpiece by performing a relative feed operation between the workpiece fixed to the table and the tool mounted on the spindle.
A data input unit for inputting at least a normal direction vector of a normal direction vector and a tangential direction vector of the inclined plane in an inclined plane coordinate system in which an inclined plane set for the workpiece is an XY plane;
Index angle of the two rotary feed shafts where the inclined surface is perpendicular to the axis of the main axis, rotation angle around the Z axis in the XY plane between the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinates A calculation unit for calculating an index angle of at least the two rotary feed axes among the variables defining the system;
A display unit for displaying the calculated index angle values of the two rotary feed axes;
An NC machine tool control device characterized by comprising: Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis And a control device for an NC machine tool for machining the workpiece by performing a relative feed operation between the workpiece fixed to the table and the tool mounted on the spindle.
A data input unit for inputting at least a normal direction vector of a normal direction vector and a tangential direction vector of the inclined plane in an inclined plane coordinate system in which an inclined plane set for the workpiece is an XY plane;
Index angle of the two rotary feed shafts where the inclined surface is perpendicular to the axis of the main axis, rotation angle around the Z axis in the XY plane between the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinates A calculation unit for calculating an index angle of at least the two rotary feed axes among the variables defining the system;
A rotation index command unit for indexing the two rotation feed shafts to an index angle determined by calculation and sending an index command to the NC unit so that the inclined surface is perpendicular to the axis of the main shaft;
An NC machine tool control device characterized by comprising: Indexing positioning of the rotary feed axis of an NC machine tool having three linear feed axes of X axis, Y axis and Z axis orthogonal to each other and at least two rotary feed axes of A axis, B axis and C axis And a control device for an NC machine tool for machining the workpiece by performing a relative feed operation between the workpiece fixed to the table and the tool mounted on the spindle.
A normal direction vector and a tangential direction vector of the inclined surface in an inclined surface coordinate system in which an inclined surface set for the workpiece is an XY plane, and an origin coordinate of the inclined surface coordinate system in a machine coordinate system of the NC machine tool A data input part for inputting a value;
A storage unit for previously inputting and storing the coordinate value of the rotation center position of the two rotary feed axes in the machine coordinate system of the NC machine tool;
An indexing angle of the two rotary feed shafts in which the inclined surface is perpendicular to the axis of the main axis, a rotation angle around the Z axis in the XY plane of the workpiece coordinate system and the inclined surface coordinate system, and the inclined surface coordinate system A calculation unit for calculating a variable to be defined;
A rotation index command unit for indexing the two rotation feed shafts to an index angle determined by calculation and sending an index command to the NC unit so that the inclined surface is perpendicular to the axis of the main shaft;
An inclined plane coordinate system current position calculation unit that calculates a coordinate value of a current position of each feed axis in the inclined plane coordinate system from the data input from the data input unit and the data stored in the storage unit;
A display unit for displaying the coordinate value of the current position of each feed axis in the calculated inclined plane coordinate system;
An NC machine tool control device characterized by comprising:

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