JP2010280028A - Nc machining method and nc data creating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining method mounted with an angle head having a tool shaft in an optional angle direction relative to a main shaft of a 5-axis NC machine tool, and to create NC data adapted to tool attitude. <P>SOLUTION: The machining method with sufficient machining efficiency is provided without using a machining method such as cutting machining and electric discharge machining generally using a specific tool by performing machining in which the angle head is mounted to the main shaft of the 5-axis NC machine tool. Further, mounting information of the angle head and tool correction information are also instructed to tool route information (CL data) prepared by a three-dimensional CAD/CAM system, thereby, the NC data, i.e., control information of the 5-axis NC machine tool corresponding to the input condition can be prepared. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a machining method in which an angle head is attached to a 5-axis NC machine tool and an NC data creation method thereof.

Conventionally, for example, machining from the inside of a workpiece, such as a cylinder and a spherical body, generally needs to be performed using a special tool such as a T-throw in cutting. Moreover, even if it can process with a standard tool, the amount of tool protrusion will become very long and good processing will not be possible. Or when it cannot process by cutting, it is necessary to use other processing methods, such as electric discharge machining, and processing time takes a lot. Further, even when machining from the outside of the workpiece, the same problem may occur because of interference with the spindle of the machine tool and the like. In either case, the efficiency is remarkably inferior in terms of increased tool costs and machining time compared to machining from the outside of a normal workpiece, but considering the quality, cost, and schedule overall, It is common to use a processing method. Moreover, the processing method using an angle head has also limited the usage method centering on triaxial processing, such as drilling.

In the present invention, as compared with the case of machining by the conventional technique, machining performed by attaching an angle head to a 5-axis NC machine tool can be performed under the same tool and cutting conditions as machining from the outside of a normal workpiece. It is possible to provide a machining method that can reduce the cost of tools such as special tools and shorten the machining time.

It is an object of the present invention to provide a method of creating NC data for a machining process in which normal machining without an angle head and machining according to the present invention with an angle head are mixed.

An object of the present invention is to provide an NC data creation method corresponding to an angle head having an arbitrary angle so that various angle heads can be used.

Further, there are a plurality of types of tool length corrections such as tool axis direction correction and tool tip point correction by a numerical controller, and an object of the present invention is to provide an NC data creation method corresponding to the correction method.

The present invention is a machining method characterized by attaching an angle head capable of tool change to a 5-axis NC machine tool.

NC data corresponding to the machining method is input with tool tip information on the tool path, angle head mounting information and tool correction method information created by a three-dimensional CAD / CAM system or the like, corresponding to the input conditions. An NC data creation method characterized by calculating linear movement axis positions X, Y, Z and rotational movement axis positions which are control information of a 5-axis NC machine tool.

The mounting information of the angle head is configured to include an angle head length and an angle head angle. Note that the NC creation method is characterized in that when there is no instruction from the angle head, it is handled as a normal process without the angle head attached.

The tool correction method information is configured to include a correction method and a correction number.

This invention uses a tool similar to normal part machining for parts that were difficult to machine by machining with an angle head attached to a 5-axis NC machine tool. A shortened workpiece with improved machining accuracy can be obtained.

As for the principle of the present invention, as shown in FIG. 1, the spindle head of a 5-axis NC machine tool has a 5-axis NC machine tool having a B-axis that is a rotation axis around the Y-axis and a C-axis that is a rotation axis around the Z-axis. Explain by machine. However, the same applies to a 5-axis NC machine tool having an axis configuration other than the B and C axes and a table rotation axis. In this description, it is assumed that the angle head attached to the spindle head has an angle head angle around the Y axis in the same manner as the B axis.

FIG. 2 is a flowchart showing the basic processing of the NC data creation method of the present invention. In this description, the tool tip CL data created by a CAD / CAM system or the like includes tool tip information, angle head mounting information, and tool correction method information.

The tool tip information included in the CL data is instructed in the following format, for example.
GOTO / Ptx, Pty, Ptz, Vx, Vy, Vz
In this way, the coordinates of the tool tip (Ptx, Pty, Ptz) and the tool axis vector (Vx, Vy, Vz, size = 1) at that position are described.

FIG. 3 is an explanatory diagram showing parameters related to the angle head. The mounting information of the angle head is instructed in CL data in the following format, for example.
HEAD / paraANG, paraL, paraP
paraANG indicates the angle (α in FIG. 3) between the spindle head and the tool.
paraL indicates the distance from the gauge line to the center of the tip of the angle head (L in FIG. 3).
paraP indicates the distance (P in FIG. 3) from the center of the main axis to the center of the tip of the angle head.
In the following description, α, L, and P are used.

The correction method information included in the CL data is instructed in the following format, for example.
CUTCOM / FRONT
When FRONT is specified, the coordinate value is output at the tool tip position. When not instructed, the output is performed using the conventional pivot point.

When the angle head is not used, the calculation of the position of the rotation axis B is the same as the B-axis angle of the tool and the B-axis angle of the machine.
Angt = acos (Vz)
When an angle head is used, the B-axis angle of the machine is obtained by adding the angle of the angle head to the B-axis angle of the tool.
Angm = Angt-α
Since the calculation of the position of the rotation axis C is the same as when the angle head is not used, it is omitted in this description.

The output coordinate values of NC data are output as pivot points or tool tip points according to the correction method information as follows.
For the calculation of the coordinate value Pv in the case of pivot point output, as shown in FIG. 4, the control point position is obtained from the tool tip position when the rotary shaft structure is B / C as follows.
Tdx = Tlen * abs (sin (α))
Tdz = Tlen * abs (cos (α))
If the angle head angle is “+”,
Pvx = Ptx + Tdx + P
If the angle head angle is “-”,
Pvx = Ptx-Tdx-P
Pvy = Pty
Pvz = Ptz + Tdz + L
In the calculation of the coordinate value in the case of correcting the tool tip point, the coordinate value of the tool tip is output to the NC data in this case, and the coordinate value of the tool tip in the NC programming coordinate system is used as it is.

It is explanatory drawing which attached the angle head to the 5-axis NC machine tool. It is a flowchart which shows the basic process of NC data preparation method. It is explanatory drawing which shows the parameter regarding an angle head. It is explanatory drawing of the method of calculating | requiring a control point position from the tool front-end | tip point at the time of angle head use.

1 5-axis NC machine tool spindle 2 Angle head 3 Tool

Claims (8)

A machining method in which an angle head having an arbitrary angle with respect to a main axis of a 5-axis NC machine tool having two axes of three linear movement axes orthogonal to each other and two rotational movement axes for tilting the tool with respect to the linear movement axis. The machining method according to claim 1, wherein the machine tool also includes a rotational movement axis that tilts a table with respect to the tool as the rotational movement axis. The processing method according to claim 1, wherein the machine tool also includes a rotational movement axis that tilts a table with respect to the table as the rotational movement axis. The processing method according to any one of claims 1 to 3, wherein the angle head having an arbitrary angle has a function capable of fixing or changing the angle, and a tool is attached to the angle head. NC data for calculating linear movement axis positions X, Y, Z and rotational movement axis positions, which are control information of a 5-axis NC machine tool, by inputting the tool tip information, angle head attachment information and tool correction method information of the tool. How to make. The tool tip information is an NC data creation method given as coordinates of a tool tip position and a direction vector in the tool axis direction. The angle head mounting information is an NC data creation method in which an angle head length and an angle head angle are given as information indicating the rotational position of the angle head. The tool correction method information is an NC data creation method in which a correction method of a tool no correction method, a tool axis direction correction method, and a tool tip point correction method is given.

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