Metal working – Plural diverse manufacturing apparatus including means for... – Type of machine
Patent
1989-12-12
1992-06-02
Bilinsky, Z. R.
Metal working
Plural diverse manufacturing apparatus including means for...
Type of machine
29 36, 29DIG56, 82118, 82120, 82129, B23B 300
Patent
active
051175444
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a machine tool for working a work in the shape of a rotary body, and relates to a CNC (computer numerical control) lathe provided with two spindle stocks and two tool rests opposed on a single base.
2. Background Art
It has been heretofore carried out to add milling working to a conventional one-spindle type CNC lathe. In this case, a main spindle stock is secured to a base. In association with the spindle there is provided a spindle motor for machining and working and a spindle index driving device capable of being mechanically engaged with and/or disengaged from the spindle motor and a spindle orientation mechanism using a locating roller, a locating pin and the like so that the spindle can be stopped at an angle of an original point. The spindle index driving device and the spindle (the first spindle) are coupled at the angle of the original point. The tool rest is of the turret type, which can be moved and located in a direction of the spindle (in a direction of axis Z) and in a direction at a right angle to the spindle (in a direction of axis X), and the turret with a machining tool, a milling tool and a drilling tool arranged in the periphery thereof is indexed to work. The milling tool and the drilling tool are driven by a milling motor for rotating the tool.
On the other hand, the demand for a composite machine has been increased in view of the desire of obtaining a complete product by a single machine, in which the machining and milling working are done by use of the first spindle, after which the back working is carried out by the same machine. To this end, a machine using a subspindle obtained by improving a conventional tail stock has been proposed. In the machine of this kind, a subspindle unit is provided at a position of a conventional tail stock. This subspindle can be moved and located in a direction of axis Z by a hydraulic cylinder or an NC servo. The subspindle is moved forward to grip the end of a work piece, and the work piece is delivered from the spindle (the first spindle) to the subspindle to effect the back working. When the back working is carried out, the work piece held on the chuck of the subspindle is rotated and driven by the subspindle motor and worked by the tool mounted on the turret on the tool rest. In the case where the work material is a bar, the end of the bar is gripped by the subspindle before the work piece is cut off from the bar, and the first spindle and the subspindle are rotated at substantially the same speed to effect cutting-off and the work piece is delivered from the first spindle to the subspindle.
Principally, the machine body is arranged so that a flat shape base is used to reduce cost, and a chip receiving box is provided in the center of the base to provide a compactness. However, since the subspindle is one improved over the tail stock, the scale thereof is so small hat the back working merely includes chamferring and back finishing. Above all, the first spindle is in the stopped state during the back working, and the efficiency was poor.
In view of the foregoing, formation of a machine cell has been developed so that a subspindle is replaced by a powerful second spindle, a turret tool rest corresponding to the second spindle is provided to enable powerful composite working including indexing of the first spindle and second spindle, and the continuous operation can be accomplished while simultaneously performing working of both front and back surfaces of the work as well as the automatic delivery of the work between both the spindles.
In the two-spindle opposed type lathe of this kind, it is designed on the premise that the work is directly delivered from the first spindle to the second spindle and that all workings including milling and boring are accomplished by a single machine to obtain a finished product, and therefore, the synchronous operation of the first spindle and the second spindle is inevitably required. For example, when the spindle indexing is included in both front working a
REFERENCES:
patent: 2473306 (1949-06-01), Schreiber
patent: 2656754 (1953-10-01), Treer
patent: 4359676 (1982-11-01), Fujioka
patent: 4612832 (1986-09-01), Ushigoe et al.
patent: 4621405 (1986-11-01), Cook et al.
Kousaku Suzuki
Naoki Okuno
Bilinsky Z. R.
Nakamura-Tome Precision Ind. Co., Ltd.
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