Boots – shoes – and leggings
Patent
1984-05-17
1986-08-26
Smith, Jerry
Boots, shoes, and leggings
364184, 29568, G05B 19403, B23Q 1516
Patent
active
046086447
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a tool life supervision method and, more particularly, to a tool life supervision method in which the life of a tool is monitored and machining is performed by using a new tool when the former tool has reached the end of its life.
In numerical control (NC) machining tools sustain wear, and when a tool has reached the end of its life machining can no longer be carried out in the manner commanded. Accordingly, conventional practice, as disclosed in Japanese Patent Publication No. 51-48825 (Japanese Patent Application No. SHO 47-80915), is to supervise tool life tool by tool and when a tool reaches the end of its life, to use a succeeding tool in accordance with a pre-registered sequence For example, the method includes monitoring utilization time for a certain tool (namely machining time using the tool), and employing a new tool when total utilization time reaches that conforming to a preset tool life.
With the foregoing tool life supervision method, however, (a) tool life supervision must be performed tool by tool, and (b) supervision of utilization sequence must be carried out, wherein a plurality of tools are prepared with respect to a single tool number, the tool utilization sequence is registered in advance, and new tools are used in the registered sequence as the preceding tools reach the end of their respective lives. For such reasons, supervision is a complicated matter.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a simple method of performing tool life supervision.
Another object of the present invention is to provide a method wherein, rather than requiring tool life supervision to be performed tool by tool, all tools commanded by a single NC machining program can be subjected to tool life supervision en bloc.
A further object of the present invention is to provide a tool life supervision method wherein, even though a plurality of identical tools are assigned different tool numbers, a tool number commanded by an NC machining program is changed automatically when the tool presently in use comes to the end of its life, whereby a tool identical with the expended tool can be selected automatically thereafter.
Still another object of the present invention is to provide a tool life supervision method wherein when a tool presently in use comes to the end of its life, a tool identical with the expended tool can be subsequently selected by automatically changing a tool number commanded by an NC machining program, and wherein a tool offset number commanded by an NC machining program can be changed automatically to a tool offset number conforming to a selected tool.
The present invention is a tool life supervision method in which the life of a tool is monitored and machining is performed by using another tool when a former tool has reached the end of its life. Particularly, the invention provides a tool life supervision method wherein tool life supervision for all tools commanded by a single NC machining program can be performed en bloc so that it is unnecessary to perform tool life supervision tool by tool. The tool life supervision method includes the steps of assigning different tool numbers to a plurality of identical tools in advance; setting in a memory means, a number of parts to be machined, which number conforms to tool life, as well as a tool selection number correction value; inserting at the end of an NC machining program an instruction or symbol which indicates the end of the program; counting instructions or symbols indicating the end of a program; monitoring whether the counted value coincides with the preset number of parts to be machined and counting the number of times coincidence is achieved; performing the following operation: represents a tool selection number indicated by a tool selection instruction in the NC machining program, and Nct represents a tool selection number correction value; and selecting a tool by employing the result of the aforesaid operation as an actual tool selection nu
REFERENCES:
patent: 4442494 (1984-04-01), Fromson et al.
patent: 4497029 (1985-01-01), Kiyokawa
Fanuc Ltd
MacDonald Allen
Smith Jerry
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