JPH05237703A - Lathe for working non-circular workpiece - Google Patents

Abstract

PURPOSE:To increase cutting speed, improve the life of a cutting tool and enable high accuracy working by a standard cutting tool. CONSTITUTION:An intermediate table 5 is provided on a saddle 3 movable in the direction of Z axis. A movable body 11 on the X axis is mounted on the intermediate table 5 and connected to X axis feed motor 13 through a ball screw 12. A movable body 15 on the Y axis provided with a cutting tool holder 18 is mounted on the movable body 11 on the X axis and connected to a Y axis feed motor 17 through a ball screw 16. The X axis feed motor 13 and Y axis feed motor 17 are controlled in synchronization with the rotation of a spindle 20 by an NC apparatus so that the cutting edge of a cutting tool 19 on the cutting tool holder 18 is always contacted with the largest outer diameter portion of a non-circular workpiece in the direction of X shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lathe for turning a non-round work having a convex portion.

[0002]

2. Description of the Related Art For example, in the case of an elliptical work, if it is turned with a standard cutting tool 41 as shown in FIG.
Since the front clearance surface of the cutting tool 41 interferes with the work W, the conventional special cutting tool 4 having a large front clearance angle θ as shown in FIG.
I was using 2. However, when the special cutting tool 42 is used, the cutting speed cannot be increased because the cutting edge strength is low and chipping is easy, and the contact area between the work W and the cutting edge is small, so that the cutting edge is prematurely worn and the life is shortened. There is a problem in that it is necessary to prepare many kinds of special cutting tools 42 according to the shape of the above, which causes a high cost.
Further, since the conventional non-round work lathe is configured to synchronously control only the rotation of the spindle and the feed in the X-axis direction, as shown in FIG. 7, the front rake angle θ1 of the cutting edge with respect to the work W is ~ Θ3 repeatedly changes with the rotation of the spindle, as a result, the cutting resistance fluctuates, machining accuracy, especially,
There was also a problem that the shape accuracy was adversely affected.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the problem is that the cutting speed can be increased and the tool life can be improved.
Moreover, it is to provide a non-round machining lathe capable of high-precision machining with a standard cutting tool.

[0004]

In order to solve the above-mentioned problems, a non-round machining lathe according to the present invention has a center table installed on a saddle movable in the Z-axis direction, and an X-axis machine mounted on the center table. The moving body is placed, the X-axis feed motor is connected to the X-axis moving body, the Y-axis moving body equipped with the bite holder is placed on the X-axis moving body, and
The Y-axis feed motor is connected to the axis-moving body, and the X-axis feed motor and Y-axis feed motor are used as main spindles so that the cutting edge of the bite on the bite holder always contacts the maximum outer diameter part of the non-round work in the X-axis direction. It is configured by providing an NC device that controls in synchronization with the rotation of the.

[0005]

In the non-round machining lathe of the present invention, N
The C device controls the X-axis feed motor and the Y-axis feed motor in synchronization with the rotation of the spindle, so that the cutting edge of the cutting tool is always in contact with the maximum outer diameter portion of the non-round work in the X-axis direction. Is turned. Therefore, there is no risk that the front flank of the cutting tool interferes with the work, and the standard cutting tool can be used without any problems. Therefore, the cutting speed can be increased, the life of the cutting edge can be improved, and the tool cost can be reduced. Further, since the cutting edge of the cutting tool is always in contact with the maximum outer diameter portion of the workpiece in the X-axis direction, it is possible to suppress variation in cutting resistance and improve machining accuracy, particularly shape accuracy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. As shown in FIG. 1, a bed 1 of an NC lathe is provided with an inclined sliding surface 2, on which a saddle 3 is supported by a ball screw 4 so as to be slidable in the Z-axis direction. There is. Middle stand 5 is X1 on the saddle 3.
It is installed so as to be slidable in the axial direction, and is connected to a center feed motor 10 via a ball screw 6, a pulley 7, a timing belt 8 and a pulley 9. The X-axis moving body 1 is located on the center stand 5.
1 is mounted slidably in the X2 axis direction, and the ball screw 12
It is connected to the X-axis feed motor 13 via. The X-axis moving body 11 is provided with a sliding surface 14 that is inclined by α ° with respect to the X2-axis, and a Y-axis moving body 15 is mounted on the sliding surface 14 so as to be slidable in the Ys-axis direction. It is connected to a Y-axis feed motor 17 via a ball screw 16. Y-axis moving body 15
A bite holder 18 is provided on the upper side, and a bite 19 is attached to the bite holder 18 so as to be oriented toward the main shaft 20. Then, as shown in FIG. 2, the spindle 20 is configured to be rotatable and indexable by a spindle drive motor 22 having a pulse generator 21.

The NC device 23 is a CP that controls each part of the lathe.
U24 is provided, and this CPU 24 has a non-round work W
A simple program input device 25 for inputting a machining program (see FIGS. 3 and 4) and a program data memory 26 for storing the machining program data are connected. In addition, the NC device 23 uses X1, Z, X2, Ys
Function generators 27 to 30 are provided for each axis, and a feed command for each axis is created based on the program data and the rotational position signal from the spindle drive motor 22, and is sent via the D / A converter 31 and the amplifier 32. Center table feed motor 10, saddle feed motor 33, X-axis feed motor 13, Y-axis feed motor 17
Is configured to control. As a result, the X-axis feed motor 13 and the Y-axis feed motor 17 are controlled in synchronization with the rotation of the main spindle 20 so that the cutting edge of the cutting tool 19 always contacts the maximum outer diameter portion of the non-round work W in the X-axis direction. To be done.

When turning the non-round work W, the center table 5 is positioned in the X1 axis direction, and the X axis moving body 11 and the Y axis moving body 15 are arranged at the turning start position. X-axis feed motor 13 and Y-axis feed motor 17
Is controlled by the NC device 23 in synchronization with the rotation of the main shaft 20. As a result, as shown in FIGS. 3 and 4, regardless of the rotational position of the elliptical work W or the eccentric work W, the cutting edge of the cutting tool 19 is located at the maximum outer diameter portion of the work W in the X-axis plus direction. The workpiece W is turned while always in contact with it. Therefore, there is no possibility that the front flank of the cutting tool 19 interferes with the work W, the standard cutting tool can be used without any problems, and thus the cutting speed can be increased, the life of the cutting edge can be improved, and the tool cost can be reduced. .. Further, since the cutting edge of the cutting tool 19 is constantly in contact with the maximum outer diameter portion of the work W in the X-axis direction, it is possible to suppress the variation in cutting resistance and improve the machining accuracy, particularly the shape accuracy. In addition, the X-axis moving body 11 and the Y-axis moving body 1
5 is connected to the X-axis feed motor 13 and the Y-axis feed motor 17 only through the ball screws 12 and 16, so that the movable part is lightened, the sliding resistance and the inertia are reduced, and as a result, the X-axis feed motor is reduced. The moving body 11 and the Y-axis moving body 15 accurately follow the high-speed rotation of the main shaft 20 and are positioned with high precision.

The present invention is not limited to the above-mentioned embodiment, and for example, the X-axis moving body and the Y-axis moving body are X-axis moving bodies.
In order to transmit driving force by connecting to the axial feed motor and the Y-axis feed motor, not only the ball screw but also the rack and pinion are used, and the shape and configuration of each part are appropriately changed without departing from the spirit of the present invention. It is also possible to materialize.

[0010]

As described above in detail, according to the present invention, since the cutting edge of the cutting tool is configured to cut the maximum outer diameter portion in the X-axis direction of the non-round work, the cutting speed can be increased. It has an excellent effect that the tool life can be improved and high precision machining can be performed with the standard tool.

[Brief description of drawings]

FIG. 1 is a side view of a non-round processing lathe showing an embodiment of the present invention.

FIG. 2 is a block diagram of an NC device that controls the lathe shown in FIG.

FIG. 3 is an explanatory view showing a turning action of an elliptical work by the lathe shown in FIG.

FIG. 4 is an explanatory view showing a turning operation of the eccentric work by the lathe shown in FIG. 1.

FIG. 5 is an explanatory view showing a turning action by a conventional standard cutting tool.

FIG. 6 is an explanatory view showing a turning action by a conventional special cutting tool.

FIG. 7 is an explanatory diagram that points out another conventional problem.

[Explanation of symbols]

1 ... Bed, 2, 14 ... Sliding surface, 3 ... Saddle,
4, 12, 16 ··· Ball screw, 5 · · Middle mount, 7, 9 ·
・ Pulley, 8 ・ ・ Timing belt, 10 ・ ・ Middle platform feed motor, 11 ・ ・ X axis moving body, 13 ・ ・ X axis feeding motor, 15 ・ ・ Y axis moving body, 17 ・ ・ Y axis feeding motor, 1
8 ... Bite holder, 19 ... Bite, 20 ... Spindle,
21..Pulse generator, 22..spindle drive motor, 23..NC device, 24..CPU, 25..simple program input device, 26..program data memory, 27-30..function generator, 31 ..・ D / A converter, 32 ・ ・ Amplifier, 33 ・ ・ Saddle feed motor

Claims (1)

[Claims] 1. An X-axis moving body in which a Z-axis movable body is mounted on a Z-axis movable saddle, an X-axis moving body is placed on the Z-axis moving body, and an X-axis moving motor is connected to the X-axis moving body. Place the Y-axis moving body equipped with a bite holder on top, connect the Y-axis feed motor to the Y-axis moving body, and the cutting edge of the bite on the bite holder is the maximum outer diameter part of the non-round work in the X-axis direction. To always contact X
A non-round machining lathe, comprising an NC device for controlling the shaft feed motor and the Y-axis feed motor in synchronization with the rotation of the spindle.