Turning – Process of turning
Reexamination Certificate
2000-05-09
2003-03-25
Tsai, Henry (Department: 3722)
Turning
Process of turning
C082S106000, C409S243000
Reexamination Certificate
active
06536312
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a compound machining center capable, of carrying out a compound machining including turn broaching working and turning working, and also relates to a compound machining method and a machine tool. And the present invention further relates to a compound machining center capable of working both ends of a work having a shaft shape by one working machine.
2. Prior Art
In a known art, many kinds of shaft-shaped works (called merely work or works herein) are subjected to turning (roughing) working by using a turning machine such as lathe, and in the prior art, in order to carry out a finishing working continuously after the roughing working, there is known a turret lathe to which a plurality of tools are mounted and by which a work is worked while sequentially changing (exchanging) the tools.
Furthermore, there is known a turn broaching machine as a machine or tool for continuously working the work from the roughing to the finishing.
Such known broaching machine comprises a broaching tool having a disc shape or linear shape and a plurality of (working) tips which are adapted to work the work from the roughing working to the finishing working and which are mounted and arranged to the disc-shaped broaching tool in the circumferential direction thereof or to the linear-shaped broaching tool in the linear direction thereof with a space from each other. The broaching tool is rotated or linearly moved in the tangential direction, while rotating the work, to thereby carry out the turning working and the turn broaching working by means of tips.
However, in the conventional turret lathe, it is required for the turret to have a large size for mounting a plurality of tools, which requires much installation space and, hence, the machine itself is made large and expensive, thus being inconvenient and disadvantageous.
Furthermore, in the conventional broaching machine, since it is necessary to use the large disc-shaped or linear-shaped broaching tool provided with a plurality of tips, as like as the turret lathe mentioned above, a large sized and expensive broaching machine is required. Moreover, since the broaching tool is itself large and heavy, much time and labor are required for an operator to exchange the tools, and in such tool exchanging time, the operation or working of the machine is interrupted, thus being also inconvenient and disadvantageous in productivity, for example.
Incidentally, for example, Japanese Patent Laid-open Pub. Nos. S 63-196315, 63-196316 and S 63-237810 disclose a turning machine for carrying out a turning working to a work while linearly moving a tool.
However, according to the known structures of such publications, the tool is moved linearly only in a direction normal to the axis of the work having shaft shape to carry out the broaching working to the work, and hence, it is impossible to lathe the work while moving the tool in the longitudinal direction of the shaft-shaped work. Therefore, types or kinds of the works to be worked by such turning machine are limited, thus being inconvenient and not practical in use.
Still furthermore, in the prior art, when a shaft-shaped work such as crankshaft is worked by a turning machine such as lathe, there has generally been adopted a method of lathing the work by supporting one end portion of the work by a tail stock center and clamping the other one end portion by a chuck through which the work is rotated.
However, in this known method, the end portion clamped by the chuck cannot be worked. In order to obviate this defect, in the prior art, two turning machines are preliminarily prepared. The entire portion of the work except for the end portion clamped by the chuck is worked by one turning machine and, then, the work is transferred to the other turning machine by which the unworked end portion, which has been clamped by the chuck, is worked.
In a general turning machine, however, the chuck and driving means are disposed on a left side and the tail stock is installed on a right side. Therefore, when both the end portions of the work is worked by using two turning machines, it is necessary to turn, by 180°, the work one end portion of which has been worked by the first turning machine and to mount the work to the second turning machine. For such operation, there is required, a work inverting mechanism provided for the conveying means such as autoloader for conveying the work between the turning machines. Thus, the work conveying means is made complicated in its structure and is made expensive.
Still furthermore, the location of two turning machines at the working line will involve an increased equipment cost and require much space for installation, thus being inconvenient and defective.
To eliminate this defect, Japanese Patent Pub. No. S 61-3604 shows a crankshaft turning machine.
In this crankshaft turning machine, both the end portions of the crankshaft are supported by tail stocks and the intermediate portion thereof is grasped by a grasping member, and the work turning working is carried out by a work driving device while rotating the work.
By the crankshaft turning machine disclosed in the above prior art publication, however, both the end portions of the work can be worked, but the intermediate portion thereof grasped by the grasping member cannot be worked and this intermediate portion should be worked thereafter by another turning machine, which hence requires a plurality of turning machines, involving the increased equipment cost.
Furthermore, a work such as crankshaft has usually both end portions having different shapes, so that the turning (working) conditions are different. Accordingly, when the work is worked by the turning machine mentioned above, since the work is rotated by the single work driving device, it is difficult to turn and cut both the end portions at suitable turning speeds at the times of turning the work with the different working conditions, respectively and hence, it is difficult to carry out the working at a precise performance.
SUMMARY OF THE INVENTION
An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art mentioned above and to provide a compound machining center in which a turn broaching working for working a work (workpiece) is performed by linearly moving a tool in a tangential direction of the work while rotating the work and a turning working for turning the work is performed by moving the tool in the direction normal to the axis of the work while rotating the work, independently or in combination, and also provide a compound machining method and a machining tool for the machining center.
Another object of the present invention is to provide the compound machining center, the machining method and the machining tool for improving productivity of works each having a shaft-like long scale by using one turning machine by which the turning working of both end portions of the work can be effectively performed.
These and other objects can be achieved according to the present invention by providing, in one aspect, a compound machining center comprising:
a work driving unit, including a chuck, mounted on a bed and adapted to rotate a work to be worked in a state of the chuck grasping one end of the work;
a tail stock center mounted on the bed and adapted to support the other one end of the work so as to support the work on a working axial line between the tail stock center and the chuck of the work driving unit;
a working unit disposed on the bed to be movable in an X-axis direction parallel to the working axis line and a Y-axis direction normal to the X-axis direction by X-axis driving means and Y-axis driving means; and
a tool mounted to the working unit to be linearly movable in a tangential direction of the work by Z-axis driving means to thereby carry out turning working and turn broaching working.
In another aspect, there is also provided a compound machining center comprising:
a pair of work driving units, each including a chuck, mounted on a bed a
Frishauf Holtz Goodman & Chick P.C.
Komatsu Machinery Corporation
Tsai Henry
LandOfFree
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