Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1990-05-30
1992-01-28
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
36447421, G05B 1918
Patent
active
050846604
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an NC command system of a computerized numerical control (CNC) lathe, and more specifically, to a NC command system which enables a coupling relationship during machining to be established between a plurality of spindles and a plurality of tool posts to be switched by a machining program.
BACKGROUND ART
Generally, CNC lathes and the like are provided with a plurality of spindles and a plurality of tool posts and machine a plurality of workpieces with a plurality of tools to increase the machining speed thereof.
In these CNC lathes, the spindles are fixedly coupled to the tool posts, and thus machining can be carried out, for example, only by a first spindle coupled to a first tool post and a second spindle coupled to a second tool post.
Consequently, although a plurality of the spindles are provided, there is a limit to the effective machine of the workpieces at a high speed. For example, when the machining of a first workpiece takes a long time but a second workpiece is machined in a short time, the machining can be effectively carried out in such a manner that the first workpiece is partially machined by the second tool post.
Further, sometimes a requirement for machining a workpiece mounted on a second spindle by a tool mounted on a first tool post arises, depending on the structure of a machine.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide an NC command system which enables a coupling relationship during machining to be established between a plurality of spindles and a plurality of tool posts to be switched by a machining program.
To solve the above problem, in accordance with the present invention, there is provided an NC command system of a CNC lathe having a plurality of tool posts, the position of which can be independently controlled, and a plurality of spindles, the angular velocity, that is the rpm, of which can be independently controlled, wherein a coupling relationship during machining of the spindles and the tool posts can be established by switching carried out through a machining program.
The machining efficiency can be improved by enabling a coupling relationship during machining to be established between the spindles and the tool posts to be switched by the machining program.
cl BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing a relationship between the spindles and the tool posts of a CNC lathe according to the present invention, when provided with two spindles and two tool posts;
FIG. 2 is a diagram showing an example of a machining program; and
FIG. 3 is a block diagram of a numerical control apparatus embodying the present invention.
BEST MODE OF CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a relationship between the spindles and the tool posts of a CNC lathe provided, for example, with two spindles and two tool posts, wherein 1 designates a first tool post having a tool 1a and controlled in X and Z directions along X1 and Z1 axes; 2 designates a second tool post having a tool 2a and controlled in the X and Z directions along X2 and Z2 axes; 3 designates a first spindle on which a first workpiece 4 is fixed; and 5 designates a second spindle on which a second workpiece 6 is fixed.
A coupling relationship between the tool posts and the spindles is established by a machining program. For example, it is assumed that the first workpiece 4 is machined by the tool 1a of the first tool post 1 and the second workpiece 6 is machined by the tool 2a of the second tool post 2.
At this time, a machining program is determined for each tool post. For example, a machining program having an odd program number controls the position of the first tool post and a machining program having an even program number controls the position of the second tool post.
When the first workpiece 4 is machined by the tool 1a of the first tool post, a machining program of the first tool post, i
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Murakami Kunihiko
Sasaki Takao
Bergmann Saul M.
Fanuc Ltd.
Shoop Jr. William M.
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