JPH054149A - C-axis control lathe - Google Patents

Abstract

PURPOSE:To construct a lathe, which can make sensing of the angle of the processing reference point to the point of origin of the C-axis for a work to be processed which has such a C-axis value specified shape that the C-axis value of the processing reference point is specified with angle, and which can perform processing involving C-axis processing while keeping accurate position relationship relative to the C-axis value specified shape. CONSTITUTION:When a work to be processed 20 has a special shape including a C-axis value specified shape wherein the C-axis value of the processing reference point MP is specified with angle gamma, the angle theta of the processing reference point, MP to the point of origin of the C-axis, CZP, is determined from the specified angle gamma of the C-axis value specified shape relative to the processing reference point MP and the angles alpha, beta to the C-axis point of origin CZP of the measuring points M1, M2, M3, M4 on both sides about the C-axis direction of the C-axis value specified shape, and thereupon milling process, etc., is conducted with C-axis control.

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a work having a C-axis value designated shape in which the C-axis value with respect to a machining reference point is designated by an angle,
The present invention relates to a lathe that is machined by C-axis control based on the C-axis origin.

[Prior Art]

Conventionally, in a C-axis control lathe, there are projections and depressions whose angles in the C-axis direction from a machining reference point are specified on the inner and outer peripheral portions and end faces of the work, and the work has a special shape that is not axially symmetric. At some point, it was necessary to accurately set the machining reference point designated in the machining program with respect to the C-axis origin, which is the reference for C-axis control. Therefore, in this type of lathe, a special jig is used to set a work of a special shape to perform machining such as milling with C-axis control.

[Problems to be Solved by the Invention]

However, in the above-mentioned lathe, there is a problem that a special jig dedicated to the work must be prepared every time the shape of the work is different, which is troublesome and the machining efficiency is extremely low. Today, the current trend is that there are major inconveniences in terms of cost and time. Of course, it is possible to set the work without using a special jig, but in this case, it takes a lot of time for setting and it is difficult to set accurately.

Therefore, an object of the present invention is to easily detect the angle from the origin of the C-axis of the machining reference point for a work having a C-axis value designated shape in which the C-axis value with respect to the machining reference point is designated by the angle. It is an object of the present invention to provide a lathe capable of performing machining such as milling accompanied by C-axis machining on a work having the above-mentioned special shape while maintaining an accurate positional relationship with respect to the designated axis value.

[Means for Solving the Problems]

The gist of the present invention resides in a lathe for machining a workpiece having a C-axis value designated shape in which the C-axis value with respect to a machining reference point is designated by an angle, by C-axis control with the C-axis origin as a reference. Measuring means for measuring angles from the C-axis origin at measurement points on both sides in the C-axis direction of the C-axis value designated shape by rotating the work by C-axis control based on a predetermined search program. A C-axis control lathe, comprising: a calculating unit that obtains an angle from the C-axis origin of the machining reference point based on the measured angle and a designated angle of the C-axis value designated shape with respect to the machining reference point. It is in.

[Action]

According to the C-axis control lathe of the present invention configured as described above, the workpiece has the C-axis value designated shape in which the C-axis value with respect to the machining reference point is designated by the angle, and such a special shape is used. A C-axis control lathe processes a work piece having a shape. At the time of this machining, the measuring means rotates the work by C-axis control based on a predetermined search program, so that the C-axis origin is obtained with respect to the measurement points on both sides of the C-axis value designated shape in the C-axis direction. Measure the angle from. Then, the calculating means obtains the angle of the machining reference point from the C-axis origin from the measured angle and the designated angle of the C-axis value designated shape with respect to the machining reference point. Then, in the lathe, machining such as milling accompanied by C-axis machining is performed on the work while maintaining an accurate positional relationship with the C-axis value designated shape.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a block diagram showing a configuration of a lathe to which the present invention is applied, FIG. 2 is a front view showing a relationship between a C-axis origin, a machining reference point, and a C-axis value designated shape in a work, and FIG. 3 is an outer diameter search. A flow chart showing an example of a program, FIGS. 4 and 5 are process diagrams showing a search aspect in the outer circumference of a work having a C-axis value designated shape, and FIG. 6 is an enlarged view for calculating the movement angle of the C-axis in outer diameter measurement. 7 is an explanatory view showing the measurement steps in the outer circumference measurement program, FIG. 8 is an enlarged view showing the measurement mode in the outer circumference measurement program, and FIG.
10 and 11 are flow charts showing an example of the end face search program, FIG. 10 and FIG. 11 are process diagrams showing the search mode on the end face of the workpiece having the C-axis value designated shape, and FIG. FIG. 13 is an explanatory diagram showing the measurement steps in the inner diameter / end surface measurement program, and FIG. 14 is an enlarged view showing the measurement mode by the inner diameter / end surface measurement program.

As shown in FIG. 1, a lathe 1 having a C-axis control function has a main controller 2, and the main controller 2 has a keyboard 5 and a C-axis drive control via a bus line 3. Unit 6, machining reference point memory 7, C-axis angle calculation unit 9, sensor drive control unit 10, measurement program memory 11, sensor control unit 1
2, the tool memory 13, the reference point calculation unit 15, the machining program memory 21, and the like are connected. The C-axis drive motor 16 is connected to the C-axis drive control unit 6, and the C-axis drive motor 16 is provided with a transducer 17. The transducer 17 is for detecting the rotation angle amount of the C-axis drive motor 16, and outputs the detection signal S2 to the C-axis angle calculation unit 9. The sensor drive control unit 10 includes
A contact-type sensor 19 is movably connected by the sensor drive control unit 10. The sensor 19 is also connected to the sensor control unit 12. Although the main shaft of the lathe 1 is driven by the C-axis drive motor 16, the work 20 is detachably held by a chuck device (not shown) as shown in FIG. A protruding seat portion 20a is formed.

In the lathe 1 having the above structure, the main controller 2
However, the control for the machining work is performed by reading the machining program PRO corresponding to the workpiece 20 to be machined from the machining program memory 21 and executing it. In the machining program PRO, when a machining operation such as milling accompanied by C-axis control is designated with reference to the machining reference point MP of the work 20, if the work 20 is an axially symmetric part, which of the work 20 is to be processed? The processing may be started from the angular position. However, as shown in FIG. 2, in the case where there is a protrusion such as the seat portion 20a on the outer periphery of the work 20 and the workpiece 20 is not an axially symmetric component,
In addition, when the projection or the like has the angle γ as the C-axis value specified with respect to the processing reference point MP, the processing work cannot be properly performed (hereinafter, this type of C-axis value is specified. The shape is called "C-axis value specified shape"). More specifically, unless it is detected which angle θ the machining reference point MP is with respect to the C-axis origin CZP which is the origin for controlling the C-axis, the C-axis value designation shape (for example, It becomes impossible to perform the machining accompanied by the C-axis control on the seat portion 20a) in an appropriate state (that is, regarding the C-axis value designated shape and the shape formed by milling,
This is because their positional relationship is constrained via the processing reference point MP).

Therefore, in this embodiment, for example, in the machining program PRO, C of the seat portion 20a and the machining reference point MP is set.
When the angle γ is designated as the axis value, the main control unit 2 immediately executes the search for the machining reference point MP. In addition,
In the machining program PRO, when the C-axis value between the C-axis value designated shape and the machining reference point MP is designated, the machining program PRO measures not only the angle γ but also the angular position of the C-axis value designated shape. Various measurement information INF for performing is specified. The measurement information INF is composed of the following data. -Position information indicating whether the C-axis value designated shape to be measured exists on the outer peripheral portion or end surface of the work 20-inner diameter portion. The coordinates of the measurement start point of the sensor 19. The distance between the measurement points M1 and M2 in the direction (X-axis direction) perpendicular to the rotation center CL (Z axis) of the workpiece 20 (distance from the rotation center CL to the measurement points M1 and M2) R _x (or workpiece end surface) From the measurement points M3 and M4 in the Z-axis direction R _z ).・ Width W of the C-axis value specified shape. -Type designation information of the sensor 19 used for measurement. First, the main control unit 2 reads the above-mentioned measurement information INF from the machining program PRO, and also reads from the measurement program memory 11 the measurement program corresponding to the existing position of the C-axis value specified shape specified in the measurement information INF. .. For example, the existence position of the designated C-axis value designated shape is
When it is the outer peripheral portion of the work 20, the main control unit 2 first reads the outer diameter search program OPR from the measurement program memory 11.

Subsequently, the outer diameter search program OPR
By calculating the angular position of the C-axis value designated shape with respect to the C-axis origin CZP based on
The angle θ with respect to ZP is obtained. Specifically, as shown in FIG. 2, the angular positions α and β on both sides of the seat portion 20a in the C-axis direction with respect to the C-axis origin CZP are measured by the sensor 19, and based on the measured angles α and β, the machining reference points are set. An angle θ of MP with respect to the C-axis origin CZP is obtained from the following equation. θ = {(α + β) / 2} −β (1) When the angle θ is obtained in this way, the main control unit 2 executes the process for measuring the outer diameter based on the outer diameter search program OPR. To do. Hereinafter, the description will be sequentially made according to the flowchart of FIG. In the first step S1, the sensor drive control unit 10 is instructed to move the sensor 19. That is, the sensor 19 is first set as the measurement information I in the machining program PRO.
The measurement is started by moving to the measurement start position designated by the NF, and then moved in the X-axis direction (downward in FIG. 4) to the coordinate position corresponding to the distance R _x (measurement information INF).
(Designated by) (corresponding to the step indicated by reference numeral 1 in FIGS. 4 and 5).

At the time of this X-axis search feed, as shown in FIG. 5, when the C-axis designated shape is located directly below the sensor 19, the seat portion 2 is provided before the sensor 19 reaches the distance R _x.
0a contacts the sensor 19. Therefore, the sensor 19
Is turned on, and the detection signal S1 is output to the main controller 2 via the sensor controller 12. Then, the main control unit 2 proceeds from step S2 to step S3, and determines whether or not the detection of the seat 20a by the sensor 19 is the first detection.
If an affirmative decision is made in step S3 that this is the first detection, then the flow of control proceeds to step S4, in which the sensor drive control unit 10 is instructed to move the sensor 19 in the X-axis + direction (upward in FIG. 5) to the measurement start position. , Fast forward (step indicated by reference numeral 2 in FIG. 5). Continued Step S5
Then, the C-axis drive control unit 6 is instructed so that the C-axis drive motor 1
6 is rotated in a fixed direction at a predetermined angle, that is, clockwise. That is, the seat 20a is retracted from below the sensor 19 (step indicated by reference numeral 3 in FIG. 5).

As shown in FIG. 6, the rotation angle δ of the C-axis in step S5 is the width W of the C-axis value designated shape designated in the measurement information INF, from the measurement point in the X-axis direction to the rotation center CL. It can be obtained from each data of the distance R _x and the diameter 2r (prestored in the tool memory 13) of the detecting portion of the sensor 19 and the following equation. δ = δ ₁ + δ ₂ = tan ⁻¹ (W / 2R _x ) + tan ⁻¹ {(W + 4r) / 2R _x } ... (2) By performing the process of step S5, the C-axis value designation shape is directly below the sensor 19. When it is retracted from the position, the process returns to step S1. In step S1, the sensor drive control unit 10 is instructed to move the sensor 19 in the X-axis-direction to the position of the distance _Rx . During this movement process, the sensor 19 is turned on again, and the detection signal S1 is output to the main control unit 2 via the sensor control unit 12. When the detection signal S1 is input, the main control unit 2 proceeds from step S2 to step S3. In step S3, since this signal is input for the second time, it is determined that there is an error in the data setting such as the distance R _x specified by the measurement information INF, and the process proceeds to step S6. In step 6, an alarm means (not shown) is instructed to display a predetermined alarm to the operator or the like.

On the other hand, if it is determined in step S2 that the detection signal S1 is not input from the sensor 19, the process proceeds to step S7. That is, when the sensor 19 reaches the measurement coordinate position designated by the measurement information INF, regardless of whether the C-axis designated shape has been saved (after the processing of step 5 has been executed), the process proceeds to step S7. Step S7
Then, the C-axis drive control unit 6 is instructed so that the C-axis drive motor 1
6 is rotated to rotate the C axis in the + direction (counterclockwise in FIGS. 4 and 5), and in step S8, the sensor 19 is rotated.
Then, the C-axis drive motor 16 is stopped after the detection signal S1 is input (step indicated by reference numeral 4 in FIGS. 4 and 5). The C-axis rotation speed in step S7 is set to be higher than that in the normal measurement operation and smaller than that in the fast-forward operation. That is, the search feed speed range suitable for detecting the approximate position of the C-axis value designated shape is set. When the C-axis value designated shape contacts the sensor 19 and the detection signal S1 is input, the process proceeds from step S8 to step S9, and the C-axis drive control unit 6 is instructed to
The sensor 19 is rotated by rotating the shaft in the-direction by a predetermined angle amount.
Is moved to a predetermined approach point AP1. That is, C
The axis is reversed to separate the tip of the sensor 19 from the C-axis value designated shape.

Further, in step S8, the C axis is set to 36 at maximum.
When it is negatively determined that the C-axis value designated shape does not come into contact with the sensor 19 and the detection signal S1 is not input even if it is rotated by 0 degree, the process proceeds to step S6 and the measurement start position Z indicated by the measurement information INF is detected. A predetermined alarm is displayed assuming that the coordinates and the distance R _x are wrongly set. When step S8 ends, the main control unit 2 shifts to the actual measurement operation based on the outer circumference measurement program OMP. That is, the outer circumference measurement program OMP is read from the measurement program memory 11, and the measurement operation of the angular position of the C-axis value designated shape is immediately started. Hereinafter, the above measurement operation will be described along the operation steps shown in FIG. 7. The number of each step represents the order of execution. First, in step number 1, the C-axis is rotated in the + direction at a rotation speed slower than the search feed of step S8 described above, that is, the measurement feed speed for measurement (step indicated by reference number 1 in FIG. 8). When the C-axis rotates and the C-axis value designated shape comes into contact with the sensor 19 at the measurement point M1, the sensor 19 outputs the detection signal S1.

Then, the main control unit 2 causes the C-axis angle calculation unit 9 to operate.
To the angle α of the measurement point M1 with respect to the C-axis origin CZP. That is, the transducer 17 mounted on the C-axis drive motor 16 calculates the angle α based on the rotation signal S2 output at each predetermined rotation angle of the C-axis drive motor 16 and outputs the angle α to the reference point calculation unit 15. On the other hand, when the detection signal S1 from the sensor control unit 12 is input, in step number 2, the C-axis drive control unit 6 is instructed to immediately move the C-axis in the-direction until the sensor 19 reaches the approach point AP1. Rotate by the specified rotation angle of. That is, the sensor 19 and the C-axis value designated shape are separated from each other (step indicated by reference numeral 2 in FIG. 8). When the separation is completed, in step number 3, the sensor drive control unit 10 is instructed to cause the sensor 19 to move in the X-axis + direction (upward in FIG. 8).
To fast forward by a predetermined distance (in FIG. 8,
Step labeled with reference number 3).

Then, in step number 4, the C-axis is rotated in the + direction at a predetermined angle in a fast-forwarding manner to move the sensor 19 to the point P.
1 (step indicated by reference numeral 4 in FIG. 8). As shown in FIG. 6, the movement angle amount ε of the C-axis at step number 4 is determined by the approach points AP1 and AP2.
And the distance between the measurement points M1 and M2 in the C-axis value designated shape is a, the distance is calculated by the following equation. ε = 2 tan ⁻¹ {(W + 2a) / 2R _x } (3) When the sensor 19 moves to the point P1 in this way, in step number 5, the sensor drive control unit 10 is instructed to turn the sensor 19 on. , The X-axis is moved at a fast-forward speed and is positioned at the approach point AP2 of the seat portion 20a having the C-axis value-designated shape (in FIG. 8, a point distant from the right side surface of the seat portion 20a to the right by a predetermined distance). (Step indicated by reference numeral 5 in FIG. 8). Then, in step number 6, the C-axis is driven in the-direction at the measurement feed speed in the same manner as in step number 1 described above, the measurement point M2 and the sensor 19 come into contact, and the sensor 1
The drive is stopped when the detection signal S1 is input from 9 (step indicated by reference numeral 6 in FIG. 8). Then, the C-axis angle calculation unit 9 is instructed to obtain the angle β of the measurement point M2 with respect to the C-axis origin CZP, and the angle β is output to the reference point calculation unit 15.

On the other hand, the detection signal S from the sensor controller 12
When 1 is input, in step number 7, the C-axis drive control unit 6 is instructed to immediately rotate the C-axis in the + direction by a predetermined rotation angle until the sensor 19 reaches the approach point AP2. That is, the sensor 19 and the C-axis value designated shape are separated from each other (step indicated by reference numeral 7 in FIG. 8). When the separation is completed, in step number 8, the sensor drive control unit 10 is instructed to fast-forward the sensor 19 in the + direction of the X-axis (upward in FIG. 8) by a predetermined distance to obtain the point P.
1 (step indicated by reference numeral 8 in FIG. 8). This completes the measurement operation of the angles α and β with respect to the C-axis origin CZP of the measurement points M1 and M2 of the C-axis value designated shape by the outer circumference measurement program OMP. When the angles α and β are measured in this way, the reference point calculation unit 15
Is the C-axis origin C of the machining reference point MP from the above equation (1).
The angle θ with respect to ZP is calculated and obtained, and the angle θ is stored in the processing reference point memory 7. Then, in the milling process or the like, the C axis is positioned with the C axis origin CZP as a reference in consideration of the angle θ with respect to the angle designated in the processing program PRO with the machining reference point MP as a reference. To do. Then, by the positioning, the milling process or the like can be performed on the machining reference point MP, that is, the C-axis value designated shape while maintaining an accurate positional relationship.

Next, C specified from the measurement information INF
A case where the existing position of the designated axial value shape is the end surface or the inner peripheral portion of the work 20 will be described. First, the main controller 2 reads the inner diameter / end face search program IRO from the measurement program memory 11. Then, based on the inner diameter / end face search program IRO, the C-axis origin C of the C-axis value designated shape
By obtaining the angular position with respect to ZP, the machining reference point MP
The angle θ with respect to the C-axis origin CZP is calculated. That angle θ
As shown in FIG. 9, in the inner diameter / end face search program IRO, the measurement point is used instead of the distance R _x set when the C-axis value designated shape is obtained when measuring the outer peripheral portion. It is necessary to set a value indicating the distance R _z in the Z-axis direction from the end surface of the work 20 of M1 and M2. When the angle θ is obtained, the main control unit 2 executes a process for measuring the inner diameter / end surface based on the inner diameter / end surface search program IRO. Hereinafter, description will be sequentially made according to the flowchart of FIG.

In the first step S10, the sensor drive controller 10 is instructed to move the sensor 19. That is, the sensor 19 is first moved to the measurement start position designated by the measurement information INF in the machining program PRO for positioning, and then moved in the Z axis + direction (downward in FIG. 10) to correspond to the distance R _z. Coordinate position (measurement information I
To the coordinate position designated by the NF) (step indicated by reference numeral 1 in FIGS. 10 and 11). This Z
When the C-axis designation shape is positioned in front of the sensor 19 during the axis search feed, as shown in FIG.
Before the seat 9 reaches the distance R _z
Abut. Therefore, the sensor 19 is turned on, and the detection signal S1 is output to the main controller 2 via the sensor controller 12. Then, the main control unit 2 proceeds from step S11 to step S12, and determines whether or not the detection of the seat portion 20a by the sensor 19 is the first detection. Step S1
When it is affirmatively determined to be the first detection in step 2, the process proceeds to step S13, where the sensor drive control unit 10 is instructed to move the sensor 19 in the Z-axis-direction (upward in FIG. 11).
To the measurement start position by fast-forwarding (in FIG. 11,
Step labeled with reference number 2).

In a succeeding step S14, the C-axis drive control section 6 is instructed to rotate the C-axis drive motor 16 in a constant direction of a predetermined angle, that is, in a clockwise direction. That is, the seat portion 20a
Is retracted from under the sensor 19 (step indicated by reference numeral 3 in FIG. 11). Note that, as shown in FIG. 12, the rotation angle δ of the C-axis in step S14 is the width W of the C-axis value designated shape designated in the measurement information INF, the x of the measurement point in the X-axis direction from the Z-axis, and the sensor. Diameter 2r of 19 detectors (pre-stored in tool memory 13)
And the following equation. δ = δ ₁ + δ ₂ = tan ⁻¹ (W / 2x) + tan ⁻¹ {(W + 4r) / 2x} (4) By executing the process of step S14, the C-axis value designated shape is changed from the front position of the sensor 19. Once saved, step S10
Return to. In step S10, the sensor drive control unit 10 is instructed to move the sensor 19 in the Z axis + direction to the position of the distance R _z . During this movement process, the sensor 19 is turned on again, and the detection signal S1 is output to the main control unit 2 via the sensor control unit 12. When the detection signal S1 is input, the main control unit 2 proceeds from step S11 to step S12. Since this signal input is the second time in step S12, it is determined that there is an error in the data setting such as the distance R _z specified by the measurement information INF, and step S1 is performed.
Go to 5. In step 15, an alarm means (not shown) is instructed to display a predetermined alarm to the operator or the like.

On the other hand, if it is determined in step S11 that the detection signal S1 is not input from the sensor 19,
It proceeds to step S16. That is, when the sensor 19 reaches the measurement coordinate position designated by the measurement information INF, regardless of whether the C-axis value designated shape is saved (after the processing of step 14 is executed), the process proceeds to step S16. .. In step S16, the C-axis drive control unit 6 is instructed to drive the C-axis drive motor 16 to move the C-axis in the + direction (104 and FIG.
1, in the counterclockwise direction on the XY plane), and in the subsequent step S17, the detection signal S from the sensor 19 is transmitted.
The C-axis drive motor 16 is stopped after 1 is input (step indicated by reference numeral 4 in FIGS. 10 and 11). The C-axis rotation speed in step S16 is set to be higher than that in the normal measurement operation and smaller than that in the fast-forward operation. That is, the search feed speed range suitable for detecting the approximate position of the C-axis value designated shape is set. When the C-axis value designated shape contacts the sensor 19 and the detection signal S1 is input, the process proceeds from step S17 to step S18, and the C-axis drive control unit 6 is instructed to move the C-axis by a predetermined angle amount in the-direction. And the sensor 19 is moved to a predetermined approach point AP1. That is, the C axis is reversed to separate the tip of the sensor 19 from the C axis value designated shape.

In step S17, the C axis is set to 3 at maximum.
When the determination signal S1 is not input from the sensor 19 because the C-axis value specified shape does not contact the sensor 19 even when rotated by 60 degrees, the process proceeds to step S15, and the measurement information INF is instructed. A predetermined alarm is displayed as an error in the setting of the Z coordinate of the measurement start position or the distance R _z . When step S18 ends, the main controller 2 shifts to the actual measurement operation based on the inner diameter / end surface measurement program IMP. That is, the measurement program memory 1
The inner diameter / end surface measurement program IMP is read from 1, and the measurement operation of the angular position of the C-axis value designated shape is immediately started. The above measurement operation will be described below in accordance with the operation steps shown in FIG. The number of each step represents the order of execution. First, in step number 1, the C-axis is rotated in the + direction at a rotation speed slower than the search feed of step S18 described above, that is, the measurement feed speed for measurement (step indicated by reference number 1 in FIG. 14). When the C-axis rotates, the C-axis value specified shape moves from the approach point AP3,
It contacts the sensor 19 at the measurement point M1. Then, sensor 1
9 outputs the detection signal S1. When the detection signal S1 is input from the sensor 19, the main control unit 2 causes the C-axis angle calculation unit 9 to operate.
To determine the angle α of the measurement point M3 with respect to the C-axis origin CZP. That is, the transducer 17 mounted on the C-axis drive motor 16 calculates the angle α based on the rotation signal S2 output at each predetermined rotation angle of the C-axis drive motor 16 and outputs the angle α to the reference point calculation unit 15.

On the other hand, the detection signal S from the sensor controller 12
When 1 is input, in step number 2, the C-axis drive control unit 6 is instructed to immediately rotate the C-axis in the-direction by a predetermined rotation angle until the sensor 19 reaches the approach point AP3. That is, the sensor 19 and the C-axis value designated shape are separated (step indicated by reference numeral 2 in FIG. 14). When the separation is completed, in step number 3, the sensor drive control unit 10 is instructed to move the sensor 19 in the Z-axis-direction (upward in FIG. 14) by a predetermined distance at a fast feed (in FIG. 14, reference numeral). The process indicated by 3.). Then, in step number 4, the C-axis is rapidly rotated in the + direction by a predetermined angle to move the sensor 19 to the point P4 (step indicated by reference number 4 in FIG. 14). As shown in FIG. 12, C at step number 4
The movement angle amount ε of the axis is determined by the approach points AP3 and AP4,
The distance from the measurement points M3 and M4 in the C-axis value specified shape is a
Then, it is calculated by the following equation. ε = 2 tan ⁻¹ {(W + 2a) / 2x _x } ... (5)

When the sensor 19 moves to the point P4 in this way, in step number 5, the sensor drive control unit 10 is instructed to move the sensor 19 in the Z-axis + direction at the fast-forward speed to specify the C-axis value. Approach point AP of the seat 20a having a shape
4 (in FIG. 14, a point distant from the right side surface of the seat portion 20a to the right by a predetermined distance) (step indicated by reference numeral 5 in FIG. 14). Then, in step number 6, similarly to step number 1 described above, the C axis is driven in the-direction at the measurement feed speed to measure the measurement point M4 and the sensor 19.
The driving is stopped at the time when the contact signal comes in contact with and the detection signal S1 is input from the sensor 19 (step indicated by reference numeral 6 in FIG. 14). Then, the C-axis angle calculation unit 9 is instructed to obtain the angle β of the measurement point M2 with respect to the C-axis origin CZP, and the angle β is obtained and output to the reference point calculation unit 15. On the other hand, when the detection signal S1 from the sensor control unit 12 is input, in step number 7, the C-axis drive control unit 6 is instructed to immediately move the C-axis in the + direction until the sensor 19 reaches the approach point AP2. Rotate by the specified rotation angle of.
That is, the sensor 19 and the C-axis value designated shape are separated from each other (step indicated by reference numeral 7 in FIG. 14). When the separation is completed, in step number 8, the sensor drive control unit 10 is instructed to move the sensor 19 in the Z-axis-direction (upward in FIG. 14) by a predetermined distance to the point P4 at a fast feed (in FIG. 14). , Designated by reference numeral 8). This completes the measurement operation of the angles α, β with respect to the C-axis origin CZP of the measurement points M3, M4 of the C-axis value designated shape by the inner diameter / end surface measurement program IMP.

When the angles α and β are measured in this way, the reference point calculation unit 15 calculates the angle θ of the machining reference point MP with respect to the C-axis origin CZP from the above equation (1). The calculated angle θ is stored in the processing reference point memory 7.
Then, in the milling process or the like, the C-axis is changed to the C-axis in consideration of the angle θ with respect to the angle designated in the machining program PRO with the machining reference point MP as a reference.
Positioning is based on the axis origin CZP. Then, by the positioning, it is possible to perform milling or the like on the machining reference point MP, that is, the C-axis value designated shape while maintaining an accurate positional relationship. As described above, in the present embodiment, when the shape of the workpiece 20 is a special shape having the C-axis value specified shape in which the C-axis value for the machining reference point MP is specified by the angle γ, the C-axis value specified shape is obtained. Of the measurement points M1, M2, M3, M4, etc. on both sides of the C-axis direction from the C-axis origin CZP and the designated angle γ with respect to the machining reference point MP of the C-axis value designated shape, from the machining reference point MP. The angle θ from the C-axis origin CZP is calculated, and machining such as milling by C-axis control is performed. therefore,
The machining reference point MP of the specially shaped work 20 is
It can be easily detected, and machining such as milling accompanied by C-axis control can be performed while maintaining an accurate positional relationship with respect to the C-axis value designated shape. Therefore, there is no need to use a special jig as in the past,
Efficient machining can be performed, and the machining cost can be reduced without spending a lot of time on setting the work.

【The invention's effect】

As described in detail above, according to the present invention, when the workpiece is a special shape having a C-axis value designated shape in which the C-axis value with respect to the machining reference point is designated by an angle, the C-axis value designated shape is obtained. For the measurement points on both sides in the C-axis direction, the angle from the C-axis origin P of the machining reference point is obtained from the angle from the C-axis origin and the designated angle with respect to the machining reference point of the C-axis value designated shape, and the C-axis control is performed. Performs processing such as milling. Therefore, the angle of the machining reference point from the C-axis origin can be easily detected, and machining such as milling accompanied by C-axis machining is performed on a specially shaped workpiece while maintaining an accurate positional relationship with the C-axis value designated shape. be able to. Therefore, there is no need to use a special jig as in the conventional case, so that efficient machining can be performed, and the machining cost can be reduced without spending a lot of time for setting the work.

[Brief description of drawings]

[0028]

FIG. 1 is a block diagram showing a configuration of a lathe according to an embodiment.

FIG. 2 is a front view showing a relationship between a C-axis origin, a machining reference point, and a C-axis value designated shape in a work.

FIG. 3 is a flowchart showing an example of an outer diameter search program executed by a main control unit.

FIG. 4 is a process diagram showing a search mode in the outer circumference of a work having a C-axis value designated shape.

FIG. 5 is a process diagram showing a search mode in the outer circumference of a work having a C-axis value designated shape.

FIG. 6 is an enlarged explanatory diagram for calculating a movement angle of a C axis in outer diameter measurement.

FIG. 7 is an explanatory diagram showing measurement steps in an outer circumference measurement program.

FIG. 8 is an enlarged explanatory diagram showing a measurement mode in an outer circumference measurement program.

FIG. 9 is a flowchart showing an example of an inner diameter / end face search program executed by a main control unit.

FIG. 10 is a process diagram showing a search mode on a workpiece end face having a C-axis value designated shape.

FIG. 11 is a process diagram showing a search mode on a workpiece end face having a C-axis value designated shape.

FIG. 12 is an enlarged explanatory diagram for calculating the movement angle of the C-axis in inner diameter / end face measurement.

FIG. 13 is an explanatory diagram showing measurement steps in an inner diameter / end surface measurement program.

FIG. 14 is an enlarged explanatory view showing a measurement mode by an inner diameter / end face measurement program.

[Explanation of symbols]

 1 ... Lathe 2 ... Main control unit 20 ... Work CZP ... C-axis origin MP ... Machining reference point α, β, γ, δ ... Angle θ ... Machining reference point Angle with respect to C-axis origin M1, M2, M3, M4 ... Measurement points

Claims (1)

Claim: What is claimed is: 1. A lathe for machining a workpiece having a C-axis value designated shape in which the C-axis value with respect to a machining reference point is designated by an angle, by C-axis control with the C-axis origin as a reference. By rotating the work by the C-axis control based on a predetermined search program, the C-axis value designated shape of the C
Measuring means for measuring angles from the origin of the C-axis at measurement points on both sides in the axial direction, the measured angle and the C
Calculating means for obtaining an angle of the machining reference point from the origin of the C-axis from a designated angle of the axis value designated shape with respect to the machining reference point;
A C-axis control lathe characterized by having.