Method of the cutting tool and its structure and corresponding method of machining rotors

Patent metadata

Field	Value
Publication number	US-12138718-B1
Application number	US-202318231882-A
Country	US
Kind code	B1
Filing date	Aug 9, 2023
Priority date	Jun 9, 2023
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

The present invention provides a design method of cutting tool and its structure and the corresponding method of machining rotors. A control unit reads a workpiece parameter of a first workpiece using a sensor and produces an annulus parameter according to the workpiece parameter. The control unit further reads an angle parameter and a displacement parameter to intersect with the annulus parameter for giving a cutting edge parameter. Then the control unit produces a cutting-tool model parameter according to the cutting edge parameter and a spiral parameter. According to the cutting-tool model parameter, a cutting tool is manufactured. Afterwards, the cutting tool and the workpiece installed to a machine tool. By performing synchronous machining on a workpiece using the cutting tool, the workpiece can be cut into a rotor.

First claim

The invention claimed is:

1. A design method of cutting tool, applied to a control unit, the control unit presetting one or more angle parameter, a displacement parameter, and a spiral parameter, the spiral parameter corresponding to the number of teeth of an annulus, the one or more angle parameter corresponding to a front cutting angle of the annulus, the displacement parameter corresponding to a cutting surface displacement, and the design method of cutting tool comprising steps of:
controlling a sensor to scan a first workpiece and producing a workpiece parameter by the control unit, and the workpiece parameter corresponding to a first shaft of the first workpiece and a first angle of the first workpiece;
producing an annulus parameter according to the workpiece parameter by the control unit, and the annulus parameter corresponding to a second shaft and a second angle of the annulus;
producing a first cutting surface parameter by the control unit, and the first cutting surface parameter corresponding to a first cutting surface of the annulus;
producing a second cutting surface parameter according to the first cutting surface parameter and the displacement parameter by the control unit, and the second cutting surface parameter corresponding to a second cutting surface of the annulus;
producing a front cutting surface parameter according to the second cutting surface parameter and the one or more angle parameter by the control unit, the front cutting surface parameter being used for intersecting with the annulus parameter for producing a cutting edge parameter, the front cutting surface parameter corresponding to a front cutting surface of the annulus, and the cutting edge parameter corresponding to a cutting edge of the annulus; and
producing a cutting-tool model parameter according to the cutting edge parameter and the spiral parameter by the control unit, the cutting-tool model parameter including the second shaft, and the second shaft and the first shaft forming a shaft distance and a shaft angle;
wherein produces a contact line according to the annulus parameter and the workpiece parameter by the control unit; the contact line corresponds to a contact line between the annulus and the workpiece; produces a noninterference space according to the contact line by the control unit; and the front cutting surface is disposed in the noninterference space.

2. The design method of cutting tool of claim 1 , wherein the annulus parameter is given by a difference set of the workpiece parameter; the first cutting surface parameter is given by disposing the cutting surface at the center of the annulus; the second cutting surface parameter is given by displacing the first cutting surface by the cutting surface displacement; and the front cutting surface parameter is given by rotating the second cutting surface by one or more angle.

3. The design method of cutting tool of claim 1 , wherein the annulus parameter includes an internal gear parameter corresponding to an internal gear of the annulus; and the workpiece parameter includes an external gear corresponding to an external gear of the first workpiece.

4. The design method of cutting tool of claim 1 , and after the step of producing a cutting-tool model parameter according to the cutting edge parameter and the spiral parameter by the control unit, further comprising a step of producing a cutting tool using a machine tool according to the cutting-tool model parameter.

5. The design method of cutting tool of claim 1 , wherein the step of producing a cutting-tool model parameter according to the cutting edge parameter and the spiral parameter by the control unit includes:
producing a first cutter model parameter according to the cutting edge parameter and the spiral parameter by the control unit; and
duplicating annularly the first cutter model parameter according to the second shaft for producing the cutting-tool model parameter by the control unit.

6. A cutting tool, comprising:
an annulus, including a penetrating hole at the center;
a first cutter, including a first body disposed on and extending from one side of the annulus, a first side of the first body extending to a second side of the first body with increasing thickness on one side of the annulus, a curved-surface member connecting the first side of the first body to the second side of the first body, the second side of the first body located on one side of the penetrating hole, the curved-surface member extending downward with decreasing thickness to form a first cutting member, a second cutting member formed extending from surface of the first body opposing to the first cutting member with decreasing thickness, and the first cutting member connecting to the second cutting member extending from the first side of the first body to the second side of the first body; and
a second cutter, disposed at the bottom of the second side of the first body, including a second body disposed on and extending from one side of the annulus, a third side of the second body extending to a fourth side of the second body with increasing thickness on one side of the annulus, a curved-surface member connecting the third side of the second body to the fourth side of said second body, said fourth side of said second body located on one side of said penetrating hole, the curved-surface member extending downward with decreasing thickness to form a third cutting member, a fourth cutting member formed extending from a surface of the second body opposing to the third cutting member with decreasing thickness, the third cutting member connecting to the fourth cutting member extending from the third side of the second body to the fourth side of the second body, and the third side of the second body connecting to the second side of the first body.

7. The cutting tool of claim 6 , wherein the first side of the first cutter includes a pad; and the third side of the second cutter includes the pad.

8. A method of machining rotors, applied to a control unit and a cutting tool designed according to claim 1 , the control unit presetting a first spin-rate parameter of the cutting tool and a second spin-rate parameter of a second workpiece, and comprising steps of:
reading the first spin-rate parameter and the second spin-rate parameter by the control unit, spinning the cutting tool at a first spin rate and a spin direction, spinning the second workpiece at a second spin rate and the spin direction, a spin-rate ratio of the first spin rate to the second rate being inversely proportional to a gear ratio of the cutting tool to the second workpiece; and
controlling the cutting tool and the second workpiece to perform synchronous machining by the control unit and cutting the second workpiece for producing a rotor by the cutting tool.

9. The method of machining rotors of claim 8 , wherein the synchronous machining can include the cutting tool being fed to the second workpiece, the second workpiece being fed to the cutting tool, and the cutting tool and the second workpiece being mutually fed.

10. The method of machining rotors of claim 9 , wherein the rotor can be a lead screw, a gear, a worm screw, an annular grinding wheel, or a workpiece with a spiral groove.

11. The method of machining rotors of claim 9 , wherein the rotor includes a plurality of external threads; the plurality of external threads include a plurality of adjacent external thread grooves; and the plurality of external thread grooves correspond to a plurality of first cutters of the cutting tool.

12. The method of machining rotors of claim 9 , wherein an axis of the second workpiece is away from an axis of the cutting tool by a shaft distance and two axes fo

Assignees

• Univ Nat Central

Inventors

• Wu Yu-Ren

Classifications

• F04C2230/10

  by removing material · CPC title

• F04C2/084

  Toothed wheels · CPC title

• B23C3/18

  for shaping screw-propellers, turbine blades, or impellers · CPC title

• B23B5/36 Primary

  for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes · CPC title

• B23P15/28 Primary

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title