Method for designing and acquiring a machining system based upon performance characteristics

• US 6,859,674 B1
• Filed: 04/28/2000
• Issued: 02/22/2005
• Est. Priority Date: 04/28/2000
• Status: Expired due to Fees

• Current Assignee: Ford Motor Company
• Original Assignee: Ford Motor Company
• Inventors: Seth, Brij B., Hamidieh, Youssef A., Muniyappa, Balachandra
• Primary Examiner(s): Picard, Leo
• Assistant Examiner(s): Rapp, Chad
• Application Number:
  US09/560,607
• Time in Patent Office: 1,761 Days
• Field of Search: 700/97, 700/108, 700/160, 700/173, 700/174, 700/193, 702/182, 702/183, 702/184, 702/186, 702/56
• US Class Current: 700/97
• CPC Class Codes: B23Q 17/00 Arrangements for observing, indicating or measuring on machine tools for automatic control or regulation of feed movement, cutting velocity or position of tool or work B23Q15/00
• CPC Class Codes: B23Q 17/0995 Tool life management

Abstract

A method for designing and acquiring a machine by the use of benchmark machines which perform a certain function or operation in a desired manner. Certain locations are analyzed on the benchmark machines and vibration measurements and/or impact tests conducted on these locations which allow certain attributes or characteristics to be respectively assigned to these locations. The new machine is designed to improve upon these respective characteristics or attributes, thereby performing the operation in a highly accurate and reliable manner.

Claims

1. A method for designing and acquiring a machine comprising the steps of:

identifying at least a first machine;

operating said at least said first machine;

testing said at least said first machine;

acquiring data by said testing of said first machine;

designing a second machine by use of said data;

building said second machine;

evaluating said second machine by the use of said data, wherein the step of evaluating said second machine further has the step of performing a finite element analysis of said second machine using the said data; and

acquiring said second machine based upon said evaluation.

2. The method of claim 1 further comprising the step of:

modifying said second machine to meet certain performance criteria obtained from said evaluation.

3. The method of claim 2 when said first machine has a certain stiffness and wherein second data further comprises a measure of said stiffness.

4. The method of claim 3 wherein a portion of said second machine receives a tool and wherein said portion vibrates by a certain amount and has a certain stiffness, and wherein said second data comprises said stiffness of said portion and a measure of said vibration of said portion.

5. The method of claim 3 further comprising the steps of:

placing said second machine in a launch area;

operating said second machine;

acquiring third data by operating said second machine;

comparing said third data to said second data; and

modifying said second machine based upon said comparison.

6. The method of claim 5 further comprising the steps of:

placing said second machine within a manufacturing plant;

operating said second machine;

acquiring fourth data by operating said machine within said manufacturing plant;

comparing said fourth data to said second data; and

modifying said second machine based upon said comparison of said fourth data with said second data.

7. The method of claim 3 wherein said stiffness is measured by use of a static force loading test.

8. The method of claim 1 wherein a plurality of machines comprises plunge cut machines.

9. The method of claim 1 wherein a plurality of machines comprises hobbing machines.

10. The method of claim 1 further comprising the step of:

modifying the second machine in accordance with results of the finite element analysis.

11. The method of claim 10 further comprising the step of:

modifying a material used in the design of the second machine.

12. The method of claim 10 further comprising the step of:

modifying a structure used in the design of the second machine.

13. The method of claim 10 further comprising the step of:

modifying a shape used in the design of a portion of the second machine.

14. The method of claim 10 further comprising the step of:

increasing a thickness of a portion of said second machine.

15. A method for designing a machine comprising the steps of:

select a first machine;

specify at least one location on said first machine;

characterizing said at least one location by a first value;

designing a second machine having a second location;

characterizing said second location by a second value, wherein the second value may be determined by using static force loading;

comparing said second value with said first value using finite element analysis to improve design characteristics of the second machine; and

approving said design based upon said comparison of said first value with said second value.

16. The method of claim 15 when said first machine has a certain stiffness at said at least one location and wherein said first value is substantially equal to said certain stiffness.

17. The method of claim 15 when said first machine vibrates by a certain amount at said at least one location and wherein said second value is substantially equal to said certain amount.

18. The method of claim 15 further comprising the steps of building said second machine;

testing said second machine in order to measure said second value; and

acquiring said second machine only if said measured second value resides below a certain threshold value.

19. A method for purchasing a machine comprising the steps of:

selecting a benchmark machine which selectively performs a desired function;

identifying a certain first portion of said benchmark machine;

measuring a certain attribute level of said first portion using at least one of a static force loading test and an impact test; and

designing a second machine which is substantially similar to said benchmark machine and which includes a first portion which differs from said first portion of said benchmark machine using finite element analysis, effective to allow said second machine to perform said desired function in a reliable and accurate manner wherein the step of designing said second machine comprises the step of modifying at least one of a material, a structure, and a shape used in the design of said second machine to improve upon at least one attribute of said benchmark machine.

20. The method of claim 19 wherein said certain attribute level comprises stiffness.

21. The method of claim 19 wherein said certain attribute level comprises an amount of vibration.

22. The method of claim 21, wherein said certain attribute level is measured by use of an impact test.

23. The method of claim 21 wherein said certain attribute level is measured by measuring vibration levels while said benchmark machine is idling a nd performing machining operations.

24. The method of claim 19 wherein said certain said portion of said benchmark machine comprises a tool reception portion.

25. The method of claim 19 wherein said benchmark machine comprises a spindle and wherein said certain portion comprises said spindle.

26. The method of claim 19 wherein said benchmark machine comprises a hobbing machine.