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Automatic operating systems of machine tools and method

  • US 4,249,243 A
  • Filed: 10/26/1978
  • Issued: 02/03/1981
  • Est. Priority Date: 11/02/1977
  • Status: Expired due to Term
First Claim
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1. An automatic operating system of a machine tool having a spindle on which a tool is mounted for machining a workpiece mounted on a machining area of said machining tool in accordance with a numercially controlled machining program, said system comprising:

  • tool storage means (MG1) containing a plurality of tools for use on said machine tool;

    means (72) for detecting a machining load while said workpiece is machined by a tool;

    memory means (73) including;

    a first memory having first and second memory areas corresponding to the tools contained in said tool storage means, said first memory area being adapted to store a first data which is referred to for judging a broken state of said tool on said spindle, and said second memory area being adapted to store a second data which represents that said tool has been judged to be broken in accordance with said first data; and

    a second memory in which a third data is stored representing a machining load detected by said detecting means after machining operation has changed to an actual normal cutting state, said third data being compared with said first data during said actual normal cutting state;

    means (74) for reading out said first and third data from said first and second memories respectively and then comparing said read out data with each other to judge that said tool has been broken, and then storing said second data into said second memory area of said first memory corresponding to said tool when the judgement of the broken state has been made;

    means (75) responsive to the judgement of the broken state of said tool for interrupting the machining of said workpiece by said tool;

    means (77) for moving said spindle relative to said workpiece to separate said tool therefrom;

    means (79) for removing said workpiece out of said machining area;

    means (81) for mounting another workpiece on said machining area;

    means (83) for selecting a machining program corresponding to said another workpiece;

    means (82) for selecting a tool out of said tool storage means for exchanging the selected tool with said tool judged to be broken; and

    means (84) for starting machining operation of said another operation with said selected tool.

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