Patent EP0104542B1 successfully refreshed from Google Patents.
EP0104542B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Numerically controlled machining method
Assignee: Mitsubishi Electric Corp
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Filing: 1983-09-14
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Granted: 1988-03-09
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Expires: 2003-09-14
Abstract
No abstract record available.
Inventors
- 👤 Tomomitsu C/O Mitsubishi Denki K.K. Niwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 19:39
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4166; G05B2219/00; G05B2219/30; G05B2219/35; G05B2219/35401; G05B2219/45; G05B2219/45141; G05B2219/49; G05B2219/49223; G05B2219/49392; G05B2219/50; G05B2219/50008
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
385 words
An NC machining method for machining a workpiece (140) with a primary cutter (20) in a primary machining mode and then machining workpiece portions (22, 24) remaining to be cut with a compensation cutter (26) in a compensation machining mode to thereby produce a desired final cut shape, said NC machining method comprising the steps of: machining the workpiece (140) with said primary cutter (20) and entering data on the shape of the workpiece, the desired final cut shape, and the shape of the primary cutter (20) into an NC apparatus; characterised by: determining the workpiece portions (22, 24) remaining to be cut with said compensation cutter (26) based on said entered data by determining the workpiece portions to be cut to achieve the final desired shape from data on the desired final cut shape and the shape of the workpiece (140), and effecting an arithmetical operation using the data of the determined workpiece portions to be cut to achieve the final desired shape and a cutting angle of 0 of the primary cutter (20), to calculate the work positions (22, 24) remaining to be cut with said compensation cutter (26); selecting a compensation cutter (26) suitable for cutting off said work portions (22, 24) remaining to be cut with said compensation cutter (26) in the compensation machining mode; setting data on the depth of cut (d) and the clearance (a) of said compensation cutter (26) into said NC apparatus; determining paths of travel (1 1 -l N ) of said compensation cutter (26) by the steps of: computing first and second points of intersection (A, B) between the desired final cut shape and a workpiece shape cut by the primary cutter (20); determining whether there are such points of intersection (A, B); computing paths of travel (1 I -1 N ) of the compensation cutter (26) for cutting off the work portions (22, 24) remaining to be cut with said compensation cutter (26) between the first and second points of intersection (A, B); effecting operations to determine the paths of travel of said compensation cutter until no points of intersection (A, B) are found with respect to the desired final cut shape; and cutting off said work portions (22, 24) remaining to be cut with said compensation cutter (26) using said compensation cutter (26).
Claim 2
Dependent Claim
385 words
An NC machining method for machining a workpiece (140) with a primary cutter (20) in a primary machining mode and then machining workpiece portions (22, 24) remaining to be cut with a compensation cutter (26) in a compensation machining mode to thereby produce a desired final cut shape, said NC machining method comprising the steps of: machining the workpiece (140) with said primary cutter (20) and entering data on the shape of the workpiece, the desired final cut shape, and the shape of the primary cutter (20) into an NC apparatus; characterised by: determining the workpiece portions (22, 24) remaining to be cut with said compensation cutter (26) based on said entered data by determining the workpiece portions to be cut to achieve the final desired shape from data on the desired final cut shape and the shape of the workpiece (140), and effecting an arithmetical operation using the data of the determined workpiece portions to be cut to achieve the final desired shape and a cutting angle of 0 of the primary cutter (20), to calculate the work positions (22, 24) remaining to be cut with said compensation cutter (26); selecting a compensation cutter (26) suitable for cutting off said work portions (22, 24) remaining to be cut with said compensation cutter (26) in the compensation machining mode; setting data on the depth of cut (d) and the clearance (a) of said compensation cutter (26) into said NC apparatus; determining paths of travel (1 1 -l N ) of said compensation cutter (26) by the steps of: computing first and second points of intersection (A, B) between the desired final cut shape and a workpiece shape cut by the primary cutter (20); determining whether there are such points of intersection (A, B); computing paths of travel (1 I -1 N ) of the compensation cutter (26) for cutting off the work portions (22, 24) remaining to be cut with said compensation cutter (26) between the first and second points of intersection (A, B); effecting operations to determine the paths of travel of said compensation cutter until no points of intersection (A, B) are found with respect to the desired final cut shape; and cutting off said work portions (22, 24) remaining to be cut with said compensation cutter (26) using said compensation cutter (26).
Claim 3
Dependent Claim
21 words
An NC machining method according to claim 1, wherein said data on said shapes are entered in the form of coordinates.
Claim 4
Dependent Claim
54 words
An NC machining method according to claim 1, wherein said paths of travel (L I -L N ) of the compensation cutter (26) are determined by subtracting the depth of cut (d) of the compensation cutter (26) form the first point of intersection (A), repeatedly, until the second point of intersection (B) is reached.
Claim 5
Dependent Claim
35 words
An NC machining method according to claim 3, wherein said depth of cut (d) is subtracted from the difference between the coordinates of the first and second points of intersection (A, B) on the X-axis.
Claim 6
Dependent Claim
79 words
An NC machining method according to claim 4, wherein said paths of travel (L,-L N ) of the compensation cutter (26) are defined by the repeated steps of moving the compensation cutter (26) by the depth of cut (d) along the X-axis, enabling the compensation cutter to cut the workpiece up to the coordinate of the final cut shape on a Z-axis, and spacing the compensation cutter (26) from the workpiece by a distance corresponding to the clearance (a).
Claim 7
Dependent Claim
33 words
An NC machining method according to claim 1, wherein said paths of travel (L,-L N ) of the compensation cutter (26) are determined after the primary cutter (20) has machined the workpiece (140).
Claim 8
Dependent Claim
34 words
An NC machining method according to claim 1, wherein said paths of travel (L,-LN) of the compensation cutter (26) are determined at the same time that the primary cutter (20) machines the workpiece (140).
Claim 9
Dependent Claim
15 words
An NC machining method according to claim 1, wherein said NC apparatus controls a lathe.
Claim 10
Dependent Claim
44 words
An NC machining method according to claim 1, wherein said compensation cutter (26) is selected from. a plurality of cutters and has a shape which is optimum for cutting off the remaining workpiece portions (22, 24) to be cut with the compensation cutter (26).
Claim 11
Dependent Claim
24 words
An NC machining method according to claim 9, wherein data on said plurality of cutters are stored in a memory of the NC apparatus.
Claim 12
Dependent Claim
25 words
An NC machining method according to claim 10, wherein the primary cutter (20) is replaced with the compensation cutter (26) by automatic cutter changing means.
Claim 13
Dependent Claim
45 words
An NC machining method according to claim 1, wherein said clearance (a) of the compensation cutter (26) is selected by setting a distance between the compensation cutter (26) and the workpiece (140) so as to prevent the compensation cutter (26) from contacting the workpiece (140).
References Cited (Backward Citations)
No citation records indexed.
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