Compound machining method and apparatus

• US 10,663,947 B2
• Filed: 01/11/2017
• Issued: 05/26/2020
• Est. Priority Date: 07/25/2006
• Status: Active Grant

• Current Assignee: MORI Seiki Company Limited (Dmg Mori Co., Ltd.)
• Original Assignee: MORI Seiki Company Limited (Dmg Mori Co., Ltd.)
• Inventors: Hyatt, Gregory A., Chaphalkar, Nitin
• Primary Examiner(s): Chad, Aniss
• Application Number:
  US15/403,939
• Publication Number:
  US 20170123408A1
• Time in Patent Office: 1,231 Days
• CPC Class Codes: B23B 3/24 the tools of which do not perform a radial movement; Rotary tool heads therefor
• CPC Class Codes: B23C 3/04 while revolving the work
• CPC Class Codes: G05B 19/40938 Tool management
• CPC Class Codes: G05B 19/416 characterised by control of velocity, acceleration or deceleration G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/49092 Vary, change controlled parameter as function of detected power
• CPC Class Codes: G05B 2219/49361 Workpiece and tool have each own rotation speed
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
• CPC Class Codes: Y10T 409/300896 with sensing of numerical information and regulation without mechanical connection between sensing means and regulated means [i.e., numerical control]

Abstract

A method of machining a workpiece may include continuously rotating the workpiece, continuously rotating a tool having at least one cutting surface, and positioning the tool relative to the workpiece so that the at least one cutting surface engages the workpiece at a first discrete location at a periphery of the workpiece. The method may further include continuing to rotate the workpiece and the tool so that the at least one cutting surface engages a second discrete location at the periphery of the workpiece, and controlling a tool surface velocity VT relative to the workpiece surface velocity VW so that the first and second discrete locations are discontinuous. The tool may make multiple iterative passes over the workpiece to engage subsequent discrete locations, wherein the first discrete location, second discrete location, and multiple subsequent discrete locations may form a machined surface that extends continuously around the workpiece.

Claims

1. A method for generating a set of compound machining parameters for compound machining a workpiece using a tool, the method comprising:

selecting a first parameter corresponding to a desired relative surface velocity V_R that is equal to a vector sum of a workpiece surface velocity V_W and a tool surface velocity V_T;

selecting a second parameter from a group of machining parameters including a desired workpiece surface velocity V_W and a desired tool surface velocity V_T;

determining a third parameter based on the desired relative surface velocity V_R and the second parameter, wherein the third parameter comprises a remaining parameter from the group of machining parameters;

rotating the workpiece and the tool together to a velocity of rotation between the tool and the workpiece, the velocity of rotation being the first parameter and one of the workpiece or tool having a surface velocity being the third parameter.

2. The method of claim 1, in which the desired relative surface velocity V_R is selected so that it does not equal zero.

3. The method of claim 1, in which each of the desired workpiece surface velocity V_W and the desired tool surface velocity V_T is at least 25 m/min.

4. The method of claim 1, further comprising:

determining a desired workpiece rotational speed N_W based on the desired workpiece surface velocity V_W and a diameter of the workpiece D_W; and

determining a desired tool rotational speed N_T based on the desired tool surface velocity V_T and a diameter of the tool D_T.

5. The method of claim 4, further comprising:

determining a rotational ratio R_W of the desired tool rotational speed N_T to the desired workpiece rotational speed N_W; and

modifying at least one of the desired rotational speed N_W and the desired tool rotational speed N_T so that the rotational ratio R_W is not an integer.

6. The method of claim 1, in which the second parameter comprises the desired workpiece surface velocity V_W and the third parameter comprises the desired tool surface velocity V_T.

7. The method of claim 1, in which the second parameter comprises the desired tool surface velocity V_T and the third parameter comprises the desired workpiece surface velocity V_W.

8. A computer implemented method, under control of a processor communicatively coupled to an input device, of generating a set of compound machining parameters for compound machining a workpiece using a tool, the method comprising:

inputting from the input device a first parameter corresponding to a desired relative surface velocity V_R that is equal to a vector sum of a workpiece surface velocity V_W and a tool surface velocity V_T;

inputting from the input device a second parameter selected from a group of machining parameters including a desired workpiece surface velocity V_W and a desired tool surface velocity V_T;

calculating a third parameter based on the desired relative surface velocity V_R and the second parameter, wherein the third parameter comprises a remaining parameter from the group of machining parameters; and

communicating the second and third parameters to an output device;

rotating the workpiece and the tool together to a velocity of rotation between the tool and the workpiece, the velocity of rotation being the first parameter and one of the workpiece or tool having a surface velocity being the third parameter.

9. The method of claim 8, in which the desired relative surface velocity V_R is selected so that it does not equal zero.

10. The method of claim 8, in which each of the desired workpiece surface velocity V_W and the desired tool surface velocity V_T is at least 25 m/min.

11. The method of claim 8, further comprising:

determining a desired workpiece rotational speed N_W based on the desired workpiece surface velocity V_W and a diameter of the workpiece D_W;

determining a desired tool rotational speed N_T based on the desired tool surface velocity V_T and a diameter of the tool D_T; and

communicating the desired tool rotational speed N_T and the desired workpiece rotational speed N_W to the output device.

12. The method of claim 11, further comprising:

determining a rotational ratio R_W of the desired tool rotational speed N_T to the desired workpiece rotational speed N_W; and

modifying at least one of the desired rotational speed N_W and the desired tool rotational speed N_T so that the rotational ratio R_W is not an integer.

13. The method of claim 8, in which the second parameter comprises the desired workpiece surface velocity V_W and the third parameter comprises the desired tool surface velocity V_T.

14. The method of claim 8, in which the second parameter comprises the desired tool surface velocity V_T and the third parameter comprises the desired workpiece surface velocity V_W.