Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1992-08-17
1994-06-14
Ip, Paul
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318572, 318573, 36416701, 36447402, 36447426, G05B 1918, G05B 19403
Patent
active
053213467
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an NC data creation method performed by an interactive type numerical control apparatus and the like, and more specifically, to an NC data creation method by which an NC program is automatically created by inputting rough machining data for a lathe and the like through a cutting condition screen.
BACKGROUND ART
Conventionally, when a program for a cutting operation is created by an interactive mode, a cutting tool is sometimes required to carry out a plurality of cutting operations. For example, when a workpiece has a large target cutting amount, a cutting amount to be cut by a single cutting operation is designated in accordance with a type of cutting tool, a raw material of a workpiece, a cutting direction and the like, and the number of a cutting operations is designated by dividing a total cutting amount by the designated cutting amount.
In a conventional rough machining, however, since the number of cutting operations and a final cutting amount to be cut by a cutting tool are determined from a quotient and remainder obtained by dividing a target cutting amount by a designated cutting amount, the final cutting amount has various values ranging from zero to the designated cutting amount. When this final cutting amount has a very small value, it becomes very difficult to actually carry out a machining operation by using a rough cutting tool.
More specifically, since a cutting state and cutting tool life depend on a depth of a workpiece cut by a cutting blade in a cutting operation, a cutting amount must be designated to an optimum value in accordance with a configuration of a cutting tool, a material of a workpiece to be cut, a cutting speed and a feed. Therefore, an interactive type automatic programming unit generally has a standard cutting amount set therein as a parameter, and an operator arbitrarily changes this cutting amount within an effective cutting range, when necessary. Nevertheless, although a cutting amount must be set to an optimum value to increase the efficiency of a program and an actual machining efficiency, it is very difficult for the operator to manually change a final cutting amount to an optimum range.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide an NC data creation method by which a final cutting amount can be set to an optimum value.
To attain the above object, according to the present invention, there is provided an NC data creation method for designating a cutting amount (a) to be cut by a single cutting operation carried out by a cutting tool, and a target cutting amount (b) of a workpiece when a cutting operation program is created by an interactive mode, the method comprising the steps of setting a lower limit value for the cutting amount (a) to be cut by a single cutting operation carried out by the cutting tool, calculating the required number (n) of cutting operations, and a final cutting amount (d) from the following formula based on the cutting amount (a) and the target cutting amount (b): than the lower limit value.
The lower limit value (s) with respect to the cutting amount (a) to be cut by a single cutting operation can be set in an interactive type automatic programming unit and the like, and a cutting amount (a) set as a standard parameter value, including a final cutting amount (d), can be automatically changed to an optimum value within an effective cutting range.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flowchart showing an example of a method according to the present invention;
FIG. 2 is a diagram showing a cutting condition screen through which an outside diameter cutting condition is set; and FIG. 3 is a block diagram showing an example of an interactive type numerical control apparatus.
BEST MODE OF CARRYING OUT THE INVENTION
An embodiment of a method according to the present invention will be described below with reference to the drawings.
FIG. 2 is a diagram showing a cutting condition screen through which an outside dia
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Matsumura Teruyuki
Nagashima Noritake
Fanuc Ltd.
Ip Paul
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