JPH02224903A - Simultaneous working method for composite lathe with plural cutting tool posts - Google Patents

Abstract

PURPOSE:To optimize the conditions of a simultaneous working by a composite lathe with plural cutting tool posts by moving positively and reversely a rotating tool with the simultaneous working of the outer diameter working by a turning tool and the center hole working by a rotating tool, and thereby satisfying the optimum working conditions of both the parts. CONSTITUTION:The outer diameter of a work W is cut by the bite 9 of a front part cutting tool post 2 and simultaneously the drilling of a center hole is made by the drill 7 of the rear part cutting tool post 1. In case the diameter of the drill 7 is smaller than the outer diameter of the work W, the rotations of a main shaft 12 are selected by matching to the cutting conditions of the outer diameter and the shortage part is compensated by oppositely rotating a rotating shaft 6 to a main shaft 12 so that the cutting conditions of the drill 7 become optimum. In case the diameter of the drill 7 is comparatively larger than the outer diameter of the work W, the rotation number of the main shaft 12 is selected by matching to the cutting conditions of the outer diameter, the rotating shaft 6 is rotated at the speed slower than that of the main shaft 12 in the same direction as that of the main shaft 12, the rotation of the main shaft 12 is offset and the cutting conditions of the drill 7 is made optimum.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for simultaneously machining an outer diameter and a center hole in a lathe with multiple tool rests having a rotating tool.

Conventional technology Conventionally, when machining the outer diameter and center hole at the same time, the drill was attached to one turret, the cutting tool was attached to the other turret, and
The common method was to feed the double-edged drive mounts at the same time and perform simultaneous cutting at respective cutting speeds obtained by rotating the workpiece.

Problems to be Solved by the Invention The methods described in the prior art either match the rotation speed of the workpiece to the machining conditions for either outer diameter cutting or inner diameter machining, or adjust the rotation speed of the workpiece to an intermediate machining condition that takes both machining conditions into consideration. There is no other way than to match the rotation speed, and appropriate machining conditions cannot be obtained for one or both, resulting in problems such as deterioration of machined surface roughness, shortened tool life, and wasted machining time.

The present invention has been made in view of these problems of the prior art, and its purpose is to provide a simultaneous machining method using a compound lathe with multiple tool rests that can obtain appropriate machining conditions for both. It is something.

Means for Solving the Problems In order to achieve the above object, the simultaneous machining method of a compound lathe according to the present invention is such that the rotary tool is rotated in the normal direction or By reversing the process, both optimum processing conditions can be satisfied.

Adjust the rotational speed of the workpiece to the optimum value for the outer diameter turning conditions, and if this workpiece rotational speed is lower than the optimum value for center hole machining, rotate the rotary tool in the opposite direction to the workpiece to compensate for the shortfall. supplement,
If the rotation speed is too high, the rotary tool is rotated in the same direction at a lower rotation speed than the workpiece so as to offset the rotation speed of the workpiece, and simultaneous machining is performed.

Embodiment An embodiment will be explained with reference to FIG. In a known compound lathe, a rear carriage is movably mounted on one of the slide guide surfaces of a head having two sets of slide guide surfaces in the X-axis direction, and A rear tool rest 1 is movably placed on the sliding guide surface of the tool via an intermediate stand, and the rear tool rest is positioned by an NC device. The front carriage is movably mounted on the other flat guide surface of the front carriage, and the slider is placed on the slide guide surface in the X-axis direction cut on the front carriage via the middle carriage. A front tool rest 2 is movably mounted, and the front tool rest is moved and positioned by an NC device. And rear tool rest 1 and front tool rest 2 are NC.
The system allows four units to be controlled simultaneously. The front tool rest 1 and the rear tool rest 2 are provided with a rear turret 3 and a front droop/nod 4 so as to be rotatable around a pivot axis in the X-axis direction (not shown). One of the mounting stations is capable of mounting a rotary tool, and a rotary tool unit 5 is attached to this rotary tool station.
is removably attached. The rotary shaft 6 rotatably provided in the rotary tool unit can be rotated in forward and reverse directions by a drive device (not shown) built in the rear tool post, and
The number of revolutions can be freely selected, and an internal machining tool (for example, a drill) 7 is removably attached to the tip.

A hide 9 is removably attached to one of the tool attachment stations of the man's front turret 4 via a tool holder 8.

A main spindle 12 is rotatably supported by a plurality of bearings on a headstock 11 provided on the left side of the head, a chuck 13 is fitted to the tip of the main spindle 12, and a workpiece W is gripped by the chuck.

Next, the operation of this embodiment will be explained with reference to FIG. 1 and FIGS. 2 and 3, which are views of the workpiece W held by the chuck from the right side. The outer diameter of the metal work W is being cut by the hide 9, and at the same time, the center hole is being drilled by the drill 7.

As shown in Fig. 2, if the drill diameter is small compared to the outer diameter of the workpiece W, select the spindle rotation speed according to the cutting conditions of the outer diameter, and rotate the drill 7 so that the cutting conditions reach the appropriate value. The shaft 6 is rotated in the opposite direction to the main shaft 12 to compensate for the deficiency. In addition, as shown in Fig. 3, when the drill diameter is relatively large compared to the outer diameter of the workpiece W, the spindle rotation speed is selected according to the cutting conditions of the outer diameter, and the rotating shaft 6 is rotated in the same direction as the spindle 12. The drill rotates at a slower speed than the main shaft, canceling out the rotation of the main shaft 12, and adjusting the relative speed to make the cutting conditions of the drill appropriate.

Effects of the Invention Since the present invention is configured as described above, it produces the following effects.

By rotating the rotary tool in the forward or reverse direction, external diameter turning and center hole machining can be performed simultaneously, making it possible to satisfy or exceed the optimum machining conditions for both, resulting in improved machined surface roughness. At the same time, an appropriate value for tool life can be obtained and machining time can be shortened.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the present invention, Figure 2 is a diagram showing a workpiece with a relatively small hole diameter compared to its outer diameter, and Figure 3 is a diagram showing a workpiece whose hole diameter is relatively large compared to its outer diameter. FIG. 3 is a diagram showing a state in which an object is being processed.

Claims (1)

[Claims] (1) External diameter machining using turning tool (9) and rotary tool (7)
A simultaneous machining method for a compound lathe with multiple tool rests (1, 2), characterized in that in simultaneous machining with center hole machining, the optimum machining conditions for both are satisfied by rotating a rotary tool forward or reverse.