Machining tool utilizing a supercritical coolant

Patent metadata

Field	Value
Publication number	US-10007246-B2
Application number	US-201414558167-A
Country	US
Kind code	B2
Filing date	Dec 2, 2014
Priority date	Dec 2, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A machining tool is provided having an insert that includes one or more interface surfaces configured to interact with a workpiece. The machining tool also has one or more distribution passages located within the insert. The one or more distribution passages are situated and sized to direct a fluid to the one or more interface surfaces while maintaining the fluid above a pressure at which the fluid exists in a supercritical state.

First claim

What is claimed is:

1. A method for machining a workpiece, comprising:
manipulating a fluid to exist in a supercritical state;
directing the fluid through an insert of a machining tool while maintaining the fluid in the supercritical state;
using the insert to remove a portion of the workpiece; and
directing the fluid to an interface surface of the insert that is interacting with the workpiece while maintaining the fluid in the supercritical state.

2. The method of claim 1 , further including sensing a first parameter indicative of a temperature of the fluid and sensing a second parameter indicative of a pressure of the fluid.

3. The method of claim 2 , wherein manipulating the fluid includes adjusting the pressure of the fluid in response to the sensed temperature so that the fluid is maintained in a supercritical state.

4. The method of claim 3 , further including mixing a lubricant with the supercritical fluid.

5. The method of claim 4 , wherein the fluid is carbon dioxide.

6. The method of claim 4 , further including selectively mixing the lubricant with the supercritical fluid to adjust a composition of a resulting mixture of the lubricant and the supercritical fluid.

7. The method of claim 2 , further including comparing the sensed first parameter and sensed second parameter to at least one of: algorithms, equations, subroutines, reference look-up maps, and tables.

8. The method of claim 7 , further including using the comparison of the sensed first parameter and sensed second parameter to adjust the pressure of the fluid.

9. The method of claim 1 , wherein the fluid in the supercritical state exists as a gas when it is directed to the interface surface of the insert that is interacting with the workpiece.

10. A method for machining a workpiece, comprising:
pressurizing a fluid to a desired pressure such that the fluid exists in a supercritical state as a gas;
directing the fluid through a machining tool while maintaining the fluid in the supercritical state;
using the machining tool to remove a portion of the workpiece; and
directing the fluid to an interface surface of the machine tool that is interacting with the workpiece while maintaining the fluid in the supercritical state.

11. The method of claim 10 , wherein directing the fluid to an interface surface of the machine tool that is interacting with the workpiece includes directing the fluid through one or more distribution passages in the machining tool.

12. The method of claim 11 , wherein the one or more distribution passages have a length no greater than 1 millimeter.

13. The method of claim 11 , wherein the one or more distribution passages have a cross-sectional diameter ranging from 0.1 millimeter to 0.3 millimeter.

14. The method of claim 10 , further including delivering a substantially constant, substantially uniform flow of the fluid to the machining tool.

15. The method of claim 10 , wherein the fluid is carbon dioxide and the desired pressure is above approximately 1,100 psi, and wherein a temperature of the fluid is approximately 75 degrees Fahrenheit.

16. A method for machining a workpiece, comprising:
manipulating a fluid to exist in a supercritical state, wherein a temperature of the fluid is above a critical temperature and a pressure of the fluid is above a critical pressure;
directing the fluid through a machining tool;
using the machining tool to remove a portion of the workpiece; and
directing the fluid to an interface surface of the machine tool that is interacting with the workpiece while maintaining the fluid in the supercritical state.

17. The method of claim 16 , wherein manipulating the fluid to exist in a supercritical state includes sensing a first parameter indicative of the temperature of the fluid and a second parameter indicative of the pressure of the fluid.

18. The method of claim 17 , further including determining if the pressure of the fluid is below the critical pressure based on the sensed first and second parameters.

19. The method of claim 16 , wherein manipulating the fluid to exist in a supercritical state includes sensing (1) a first temperature or a first pressure of the fluid upstream of a compressor and (2) a second temperature or a second pressure of the fluid downstream of the compressor.

20. The method of claim 16 , wherein the machining tool includes an insert, a connecting passage, and a securing device inserted within the connecting passage; and wherein directing the fluid through the machining tool includes directing the fluid through a clearance between an inner edge of the connecting passage and an outer edge of the securing device.

Assignees

• Grant Marion Billingsley
• Caterpillar Inc

Inventors

• Grant Marion Billingsley

Classifications

• G05B19/182 Primary

  characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control (G05B19/21 - G05B19/40 take precedence) · CPC title

• B23Q11/1053

  using the cutting liquid at specially selected temperatures (controlling the temperature of the cutting liquid for maintaining machine parts at a constant temperature B23Q11/146) · CPC title

• B23B27/10 Primary

  Cutting tools with special provision for cooling {(drills with lubricating or cooling equipment B23B51/06; features relating to lubricating or cooling of milling cutters B23C5/28; arrangements or devices for cooling or lubricating tools or work B23Q11/10)} · CPC title

• G05B2219/49049

  Coolant serves as lubrication and also to take away swarf, chips · CPC title

• G05B2219/49322

  Cool to solidify material before machining it · CPC title