Closed-loop fluid control to obtain efficient machining

Patent metadata

Field	Value
Publication number	US-2019275627-A1
Application number	US-201815916683-A
Country	US
Kind code	A1
Filing date	Mar 9, 2018
Priority date	Mar 9, 2018
Publication date	Sep 12, 2019
Grant date	—

Abstract

A system includes a machine tool that includes a cutting tool, a fluid subsystem that provides fluid to the cutting tool, and at least one processor that executes instructions that cause the at least one processor to: obtain a signal indicative of a load on the cutting tool, establish a first value of at least one parameter of the fluid based on the signal, obtain a second value of the at least one parameter that is based on a simulation, determine a difference between the first value and the second value, and adjust a state of a device of the fluid subsystem based on the determined difference.

First claim

What is claimed is:

1 . A system comprising:
a machine tool that includes a cutting tool; a fluid subsystem that provides fluid to the cutting tool; and at least one processor that executes instructions that cause the at least one processor to:
obtain a signal indicative of a load on the cutting tool;
establish a first value of at least one parameter of the fluid based on the signal;
obtain a second value of the at least one parameter that is based on a simulation;
determine a difference between the first value and the second value; and
adjust a state of a device of the fluid subsystem based on the determined difference.

2 . The system of claim 1 , wherein the device includes a pump, and wherein a drive of the pump is adjusted based on the determined difference.

3 . The system of claim 1 , wherein the device includes a valve, and wherein a degree that the value is open is adjusted based on the determined difference.

4 . The system of claim 1 , wherein the at least one parameter includes a flow rate of the fluid.

5 . The system of claim 1 , wherein the at least one parameter includes a pressure of the fluid.

6 . The system of claim 1 , further comprising:
a workpiece, wherein the second value of the at least one parameter is based on a material of the workpiece, a material of the cutting tool, an identification of a type of the fluid, a spindle speed associated with the machine tool, and a chip load.

7 . The system of claim 1 , further comprising:
a workpiece; a channel coupled to the fluid subsystem; and a filter that filters material that is liberated from the workpiece in the channel, wherein the channel returns the fluid to the fluid subsystem.

8 . The system of claim 1 , further comprising:
a flow rate sensor; and a pressure sensor, wherein the adjusted state of the device of the fluid subsystem is based on a flow rate output by the flow rate sensor and a pressure output by the pressure sensor.

9 . The system of claim 1 , wherein the load is a spindle load of a motor of the machine tool,

10 . The system of claim 1 , further comprising:
a workpiece, wherein the second value is based on an identification of a node of the workpiece.

11 . A method comprising:
establishing a first state of a device included in a fluid subsystem; delivering, by the fluid subsystem, fluid to a cutting tool of a machine tool based on the first state; obtaining, by a controller that includes a processor, a signal indicative of a load on the cutting tool; establishing, by the controller, a first value of at least one parameter of the fluid based on the signal; obtaining, by the controller, a second value of the at least one parameter that is based on a simulation; determining, by the controller, a difference between the first value and the second value; and commanding, by the controller, a second state of the device based on the determined difference, the second state different from the first state.

12 . The method of claim 11 , wherein the device includes a pump, and wherein a drive of the pump is adjusted based on the determined difference.

13 . The method of claim 12 , wherein the adjustment of the drive of the pump includes shutting off the pump.

14 . The method of claim 11 , wherein the device includes a valve, and wherein a degree that the value is open is adjusted based on the determined difference.

15 . The method of claim 11 , wherein the at least one parameter includes a flow rate of the fluid.

16 . The method of claim 11 , wherein the at least one parameter includes a pressure of the fluid.

17 . The method of claim 11 , further comprising:
cutting a node of a workpiece by the cutting tool to generate at least one chip that is liberated from the workpiece, wherein the second value of the at least one parameter is based on a material of the workpiece, a material of the cutting tool, an identification of a type of the fluid, a spindle speed associated with the machine tool, a chip load associated with the at least one chip, a cutting depth into the workpiece at the node, an identification of an orientation of a cutting edge of the cutting tool relative to the node, and a cutting speed of the cutting tool.

18 . The method of claim 11 , wherein the second state of the device accounts for a lag time between a first time corresponding to when a command is received by the device and a second time corresponding to a response to the command by the device.

19 . The method of claim 11 , further comprising:
establishing a third value of the at least one parameter of the fluid based on the determined difference; and storing, in a memory, the third value.

20 . The method of claim 19 , further comprising:
obtaining, by the controller, a second signal indicative of a second load on the cutting tool; establishing, by the controller, a fourth value of the at least one parameter of the fluid based on the second signal; determining, by the controller, a second difference between the fourth value and the third value; and commanding, by the controller, a third state of the device based on the determined second difference, the third state different from the second state.

Assignees

• United Technologies Corp

Inventors

• Wang Zhigang
• Guo Changsheng
• Viens Daniel V

Classifications

• F16N2270/20

  Amount of lubricant · CPC title

• B23Q11/1038 Primary

  using cutting liquids with special characteristics, e.g. flow rate, quality · CPC title

• F16N2250/40

  Flow · CPC title

• B23Q11/12

  Arrangements for cooling or lubricating parts of the machine (B23Q11/14 takes precedence {; movable work or tool supports using fluid bearings or fluid cushion supports B23Q1/38; cooling or lubricating means used in the working area B23Q11/10}) · CPC title

• F16N2250/04

  Pressure · CPC title