JPH06254743A - Machining method for character line - Google Patents

Abstract

PURPOSE:To provide a method wherein a spring machining tool is attached to the main spindle of a 6-axis NC machine tool and a character line is machined as interfernce between a work and the hail machining tool is automatically prevented from occurring. CONSTITUTION:A method for machining a character line comprises (a first stage) wherein tool shape data of a hail machining tool attached on a main spindle are stored; a second stage B wherein surface shape data of each of a plurality of the surface of a work are stored; (a third stage) wherein character line data on surfaces crossing each other are determined and stored; and (a fourth stage) wherein the occurrence of interference between the work and the tool is discriminated based on the stored data at intervals of a given time as the hail machining tool is fed along the character line, and during the occurrence of interference, machining is effected such that the occurrence of interference is prevented as a relative posture between the work and the tool is controlled through drive of A, B, and C rotation feed shafts during the occurrence of interference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for machining a character line formed on a portion where surfaces of a work intersect with each other. In particular, a hail tool is mounted on a main shaft of a 6-axis NC machine tool, The present invention relates to a character line processing method for continuously processing a character line while avoiding interference.

[0002]

2. Description of the Related Art Character line machining for clearly shaving a surface of a work composed of curved surfaces and a line of intersection between the surfaces clearly requires a lot of manual work and is very troublesome. Usually, it is handled by a skilled worker by hand, a rotating tool of a small-diameter ball end mill, or an electric discharge machine.

[0003]

When the finishing process is performed manually, a skilled worker is required, and there is a problem that a long working time is required and an accurate machining cannot be performed. When machining with a rotary tool with a small diameter ball end mill, the angle between the two curved surfaces adjacent to the character line at each point on the character line is not necessarily the same, and continuous automatic machining is difficult. There is a problem that a character line having a fillet radius smaller than the radius cannot be processed. On the other hand, when machining is performed using an electric discharge machine, there is a problem that a work is transported from the cutting machine tool to the electric discharge machine, and time and labor are required for the setup.
Therefore, there is a problem that it is difficult to create a high-quality character line having an arbitrary shape.

Therefore, an object of the present invention is to eliminate the above-mentioned problems, that is, it can be machined by an ordinary operator in a short time without requiring a skilled worker, and a hail machining tool for a 6-axis NC machine tool without using a ball end mill. Attach to the spindle,
Continuous automatic machining is possible while avoiding interference between work and tool,
It is an object of the present invention to provide a high-quality character line machining method of an arbitrary shape that requires no setup time because an electric discharge machine is not used.

[0005]

FIG. 1 is a flow chart of basic processing of a character line processing method according to the present invention. The character line machining method of the present invention that achieves the above object is provided by three linear feed axes of the X-axis, Y-axis, and Z-axis which are orthogonal to each other, and A-axis and Y-axis that rotate around the X-axis. Using a 6-axis NC machine tool that has three rotation feed axes, a B-axis that rotates around the Z-axis and a C-axis that rotates around the Z-axis, is formed in a portion where a plurality of surfaces of a workpiece to be processed intersect adjacent surfaces. A character line processing method for processing a character line is provided with the following steps. (First stage) The shape data of the hail processing tool mounted on the tool spindle of the 6-axis NC machine tool is stored. (Second stage) The surface shape data of each of the plurality of surfaces forming the character line of the workpiece to be machined is stored. (Third step) Character line data representing a character line is obtained from the surface shape data and stored. (Fourth step) When the hail processing tool is sent along the character line, it is determined whether or not the work and the hail processing tool interfere with each other based on the hail processing tool shape data, the surface shape data and the character line data. If, as a result of the determination, it is determined that there is no interference, the machining is continued, and if it is determined that there is interference, the rotary feed shaft is rotated and the relative attitude between the workpiece and the hail processing tool. Change and continue processing.

[0006]

2 is a block diagram of the control means of the present invention.
An arithmetic control unit 21 including a CPU that controls the whole, a surface shape data storage unit 22 that stores surface shape data of each surface of a plurality of surfaces of a workpiece to be processed, and character line data that represents a character line obtained from the surface shape data is stored. A character line data storage unit 23, a tool shape data storage unit 24 for storing the shape data of the hail processing tool mounted on the tool spindle of a 6-axis NC machine tool, and a processing program storage unit for storing a processing program for processing a character line. 25, 6-axis NC machine tool 27 has three X-axis, Y-axis, and Z-axis linear feed axes orthogonal to each other, an A-axis rotating about the X-axis, a B-axis rotating about the Y-axis, and a Z-axis. Shaft drive unit 2 that drives three rotation feed shafts of C-axis that rotates around the shaft
It consists of 6 and 6.

The arithmetic control unit 21 obtains character line data formed by two adjacent faces from the face shape data storage unit 22 which stores the face shape data of each of the plurality of faces in the workpiece to be machined, and the character line data is obtained. A machining program for storing the character line data storage unit 23, the tool shape data storage unit 24 for storing the tool shape data, and processing the character line.
5, when the hail processing tool is sent according to the character line processing program, it is determined whether or not the work and the hail processing tool interfere with each other based on the tool shape data, the surface shape data and the character line data. If it is determined that there is no interference as a result of the determination, machining continues, and if it is determined that there is interference, the rotary feed shaft is rotated and the relative posture between the workpiece and the hail processing tool. And control to continue processing.

Further, the arithmetic control unit 21 controls to rotate the rotary feed axes of the A-axis, B-axis or C-axis, or to move the three linear feed axes of the X-axis, Y-axis or Z-axis which are orthogonal to each other. The axis drive unit 26 is driven by the control unit to change the relative attitude of the tool so that the work and the tool do not interfere with each other, and control is performed to perform machining. The axis drive unit 26 drives and controls each of the 6 axes of the 6-axis NC machine tool 26 according to the control. Next, the arithmetic control unit 21
Controls the tool to move along the character line and continue machining.

According to the character line machining method of the present invention, the rotary feed axes of the A-axis, the B-axis and the C-axis are rotated so as to avoid interference between the work and the hail processing tool, and the work and the tool are formed. Since the processing is performed while controlling the relative posture, it is possible to process a high quality character line having an arbitrary shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a flow chart of basic processing steps of a character line processing method according to an embodiment of the present invention. The character line processing method of the present invention is provided with three linear feed axes of the X axis, the Y axis, and the Z axis that are orthogonal to each other, an A axis that rotates about the X axis, a B axis that rotates about the Y axis, and Using a 6-axis NC machine tool having three C-axis rotary feed axes that rotate around the Z-axis, among multiple surfaces of the workpiece to be machined,
A character line processing method for continuously processing a character line formed at a portion where adjacent surfaces intersect with each other includes the following steps. (First stage) The shape data of the hail processing tool mounted on the tool spindle of the 6-axis NC machine tool is stored. The surface shape of the tool cutting edge portion is approximated by a point cloud. (Second stage) The surface shape data of each of the plurality of surfaces forming the character line of the workpiece to be machined is stored. (Third step) Character line data representing a character line is obtained from the surface shape data and stored.

(Fourth stage) When the hail processing tool is sent in accordance with the processing program for processing the character line, the workpiece and the hail processing tool are operated at predetermined time intervals based on the tool shape data, the surface shape data and the character line data. Determine whether they interfere. (Fifth stage) When it is determined that there is no interference as a result of the fourth determination, on the other hand, when it is determined that there is interference as a result of the fourth determination, the hail processing tool advances. Direction, the arc-shaped line that is the locus of the tip of the blade of the hail processing tool that smoothly processes between two curves that represent two adjacent surfaces on a work drawn on a cross section perpendicular to the traveling direction. The center of the circle, that is, the Fale axis, which is an axis passing through the fillet center point at the tip of the hail tool, is rotated, and it is determined whether or not there is interference.

(Sixth step) When it is determined that there is no interference as a result of the fifth step determination, the machining is continued, while when it is determined that there is interference as a result of the fifth step determination, the fillet is performed. An N-axis that is a bisector of an angle formed by two curves that represent two surfaces adjacent to each other on a workpiece drawn on a cross section that passes through the center point and is perpendicular to the F-axis, and an F-axis The hail processing tool is rotated around the P axis orthogonal to both axes to determine whether or not there is interference. (Seventh stage) When it is determined that there is no interference as a result of the sixth determination, on the other hand, when it is determined that there is interference as a result of the sixth determination, rotation is performed around the N-axis. Rotate the hail processing tool to determine if there is interference. (Eighth step) If it is determined that there is no interference as a result of the determination in the seventh step, the machining is continued, while if it is determined that there is interference as a result of the determination in the seventh step, the X-axis and the Y-axis are used. , The three linear feed axes of the Z axis, which are orthogonal to each other, are driven and controlled, and the hail processing tool is moved in parallel from the work in the N axis direction until the work and the hail processing tool do not interfere with each other.

FIG. 4A is a diagram showing an example in which the fillet radius of the character line is larger than the radius of the tip of the tool, and this figure shows the cut surface of the workpiece orthogonal to the traveling direction of the tool. The tip of the hail processing tool sandwiched between two adjacent surfaces 1 and 2 on the work is indicated by a circle. The radius of this circle is the radius of the cutting edge of the hail bite. This drawing shows an example in which the tool tip portion is fed to the positions of five circles five times and the workpiece can be processed in five steps to achieve smooth surface processing. Here, when it is assumed that the tool tip portion of one large circle is fed once and the work can be processed in one step to perform the same smooth surface processing, the radius of this large circle is referred to as a fillet radius. The center of this large circle is called the fillet center.

FIG. 4B is a diagram showing an example in which the radius of the fillet and the radius of the tip of the tool are equal, and this figure also shows the cutting surface of the workpiece orthogonal to the traveling direction of the tool. This figure shows
An example is shown in which one large tool tip is sent to one circle position and a workpiece can be processed in one step for smooth surface processing. In this example, the fillet center coincides with the tool tip center.

FIG. 5 is an explanatory view of the attitude control of the hail bite in the character line processing method according to the present invention. The position of the hail bite 51 is controlled by the X-axis, Y-axis and Z-axis, the hail bite 51 is fed along the character line 53, and the hail bite 51 and the surface 1 of the work 52 or the surface 2 of the work 52 interfere with each other. A axis to avoid
When the attitude of the hail bite 51 is controlled by rotating the B-axis and the C-axis and interference avoidance is not possible with these rotary feed axes, the X-axis, Y-axis, and Z-axis are driven as necessary to move the hail bite 5.
1 is translated in a direction away from the work 52 to process the character line 53.

FIG. 6 is a cross-sectional view orthogonal to the tool feeding direction of the hail processing tool which moves by machining on the character line and the work. This drawing is an example in which the fillet center O coincides with the center of the tip of the hail bite 61. That is, the cutting edge having the same radius as the fillet radius, and the surface 1 of the work 62.
3 is an example in which a shaped tool having the same cutting edge angle as the narrow angle of the surface 2 is used. The point O is the center of the tip of the hail bite 61, and the axis passing through this point and perpendicular to the paper surface of the drawing is the feed axis of the hail bite 61 and is defined as the F axis. The N axis is orthogonal to the F axis and is a bisector of a narrow angle between the surface 1 and the surface 2 of the adjacent works 62 that sandwich the character line. The P axis is an axis that passes through the fillet center point O and is orthogonal to the F axis and the N axis.

FIG. 7A is a diagram showing an example of interference between a work and a tool which moves on a character line to be machined. This figure shows an interference area 76 where the hail bite 71 interferes with the surface 2 side of the work 72. The hail bite 71 does not interfere with the surface 1 side of the work 72. FIG. 7B is a diagram showing an example of processing a character line with a hail bite. The hail bite 71 is tilted clockwise on the surface 1 side of the work 72 to machine the character line of the first step, and the hail bite 71 is tilted counterclockwise by θ on the surface 2 side of the work 72 to set the character line of the second step. By processing, the desired character line can be processed. In order to process the character line in one step, it is possible to use a forming tool in which the center of the tip of the tool matches the fillet radius of the tool and the angle between two adjacent faces of the workpiece 72. is there.

[0018]

As described above, according to the character line machining method of the present invention, the hail tool is attached to the spindle of the 6-axis NC machine tool and the work and the tool are rotated by rotating the A-axis, B-axis and C-axis. Since the processing is performed while avoiding the interference of the above, continuous automatic processing can be performed, and a processing method of a character line of arbitrary shape with high quality can be provided.

[Brief description of drawings]

FIG. 1 is a flowchart of basic processing steps of a character line processing method according to the present invention.

FIG. 2 is a block diagram of control means of the present invention.

FIG. 3 is a flowchart of basic processing steps of a character line processing method according to an embodiment of the present invention.

FIG. 4A is a diagram showing an example in which a fillet radius of a character line is larger than a radius of a tool tip portion; FIG.
FIG. 6 is a diagram showing an example in which the radius of the fillet and the radius of the tip of the tool are equal.

FIG. 5 is an explanatory diagram of the attitude control of the hail bite in the character line processing method according to the present invention.

FIG. 6 is a cross-sectional view orthogonal to the tool feeding direction of a hail processing tool that moves by machining on a character line and a workpiece.

FIG. 7A is a diagram showing an example of interference between a work and a tool which moves on a character line to be machined; FIG.
FIG. 7 is a diagram showing an example of processing a character line with a hail bite.

[Explanation of symbols]

 1, 2 ... Work surface 51, 61, 71 ... Hale bite 52, 62, 72 ... Work 53 ... Character line O ... Fillet center point

Claims (1)

[Claims] 1. Three linear feed axes that are orthogonal to each other, namely an X axis, a Y axis, and a Z axis, an A axis that rotates around the X axis, a B axis that rotates around the Y axis, and a Z axis. Using a 6-axis NC machine tool having three rotating C-axis rotary feed axes,
In a character line machining method for machining a character line formed on a portion where adjacent surfaces intersect with each other among a plurality of surfaces of a workpiece to be machined, a hail machining tool mounted on a tool spindle of the 6-axis NC machine tool. A first step of storing the shape data; a second step of storing the surface shape data of each of the plurality of surfaces forming the character line of the workpiece to be machined; and a character line representing the character line from the surface shape data. A third step of obtaining and storing data; and, when sending the hail processing tool along the character line, based on the hail processing tool shape data, the surface shape data, and the character line data, the hail processing tool and the workpiece. Determine whether they interfere,
As a result of the determination, if it is determined that there is no interference, machining is continued, and if it is determined that there is interference, the result is
A fourth step of rotating the rotary feed shaft to change the relative posture between the workpiece and the hail processing tool and continuing the processing, the character line processing method.