Patent US3854353A successfully refreshed from Google Patents.
US3854353A
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Method and apparatus for performing a threading operation on a rotating workpiece
Assignee: Bendix Corp
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Filing: 1973-06-20
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Granted: 1974-12-17
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Expires: 1993-06-20
Abstract
Abstract A method and apparatus for guiding a tool through the series of paths required to produce a thread cut. Data defining the basic parameters of the thread, the finish cut depth and the initial cut depth are read from an active program storage medium, such as a tape reader, along with a preparatory code which specifies a thread cutting operation. The code then calls up a thread cutting routine from a mass memory which is executed in accordance with the data read from tape. After the tool reaches the final dimension coordinates, control over tool displacement is returned to the tape and tape reader.
Inventors
- 👤 H Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; G05B2219/00; G05B2219/30; G05B2219/45; G05B2219/45214; Y; Y10; Y10T; Y10T82/00; Y10T82/10; Y10T82/20; Y10T82/25; Y10T82/2502
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
A method of operating an N/C machine tool comprising the steps of: reading blocks of coded data from an active record of tool displacements and machine functions; reading from said record at least one block containing a preparatory code for initiation of a cyclical program including the steps of causing a tool to be displaced into engagement with a rotating workpiece, causing displacement of the tool along the workpiece to machine the workpiece, withdrawing the tool from engagement with the workpiece, and repeating the tool displacement steps of engagement, machining, and withdrawal at cutting depths which increase incrementally within said limits; reading from the blocks containing said preparatory code and storing in a mass memory data defining limits of tool displacement within said cyclical program of tool displacements; and thereafter executing said cyclical program under the control of parameters stored in said memory and without reference to said active record.
Claim 2
Independent Claim
150 words
A method of operating an N/C machine tool comprising the steps of: reading blocks of coded data from an active record of tool displacements and machine functions; reading from said record at least one block containing a preparatory code for initiation of a cyclical program including the steps of causing a tool to be displaced into engagement with a rotating workpiece, causing displacement of the tool along the workpiece to machine the workpiece, withdrawing the tool from engagement with the workpiece, and repeating the tool displacement steps of engagement, machining, and withdrawal at cutting depths which increase incrementally within said limits; reading from the blocks containing said preparatory code and storing in a mass memory data defining limits of tool displacement within said cyclical program of tool displacements; and thereafter executing said cyclical program under the control of parameters stored in said memory and without reference to said active record.
Claim 3
Dependent Claim
56 words
A method as defined in claim 1 wherein the steps of reading and storing said blocks of coded data includes reading and storing data defining a first depth D1 for determining the depth of the first of said repetitious thread cutting displacements, and a final depth D2 for determining depth of the final thread cutting displacement.
Claim 4
Independent Claim
117 words
A method for machining a thread in a surface of a rotating workpiece Using a tool having displacement capability relative to the workpiece along at least two axes and wherein said thread is defined by a tool displacement perimeter path of final thread depth, said method including the steps of: reading the coordinates of said perimeter path and a thread cutting preparatory code from an active storage medium, storing the data defining the perimeter path in a mass memory, and cyclically moving the tool through loops of incrementally increasing thread depth from a rough cut to a final cut within the limits of said perimeter path under the control of a program stored in said mass memory.
Claim 5
Independent Claim
117 words
A method for machining a thread in a surface of a rotating workpiece Using a tool having displacement capability relative to the workpiece along at least two axes and wherein said thread is defined by a tool displacement perimeter path of final thread depth, said method including the steps of: reading the coordinates of said perimeter path and a thread cutting preparatory code from an active storage medium, storing the data defining the perimeter path in a mass memory, and cyclically moving the tool through loops of incrementally increasing thread depth from a rough cut to a final cut within the limits of said perimeter path under the control of a program stored in said mass memory.
Claim 6
Dependent Claim
27 words
A method as defined in claim 3 including the further step of inhibiting the reading of the active medium during the performance of said cyclical tool displacements.
Claim 7
Dependent Claim
39 words
A method as defined in claim 3 wherein each of said loops include a path of tool advancement toward the workpiece, a thread cutting path, a path of withdrawing the tool from the workpiece, and a tool return path.
Claim 8
Dependent Claim
22 words
A method as defined in claim 5 wherein each of the successive thread cutting paths is initiated by a spindle marker pulse.
Claim 9
Dependent Claim
20 words
A method as defined in claim 5 wherein each of the thread cutting paths is performed in an IPR mode.
Claim 10
Dependent Claim
38 words
A method as defined in claim 5 wherein each of the return paths is traversed at a feedrate which is high as compared to the feedrate at which the tool traverses the workpiece during a thread cutting path.
Claim 11
Dependent Claim
59 words
A method as defined in claim 5 including the additional steps of calculating the number N of thread cutting paths required to advance incrementally at a uniform additional depth Delta D from one thread cutting path to the next to advance from an initial rough cut depth D1 to a final pass of depth D2 along the perimeter path.
Claim 12
Dependent Claim
68 words
A method as defined in claim 9 wherein the number of passes N is calculated according to the relationship N X1 -clearance /(2/(d1 + D2)) wherein X1 is the coordinate along the axis of tool withdrawal and advance of the initial thread cutting path point on the perimeter path and clearance is the initial separation between the tool and the surface to be threaded along the same axis.
Claim 13
Independent Claim
189 words
An apparatus for cutting a thread in a surface of a rotating workpiece comprising: means for rotating the workpiece, means for moving a tool along at least two axes relative to the workpiece, a tape reader for reading a part program tape containing blocks of information defining relative displacements between the tool and the workpiece, the limits of a final thread cutting perimeter path and a preparatory code for thread cutting operations, a programmable computer having a memory and being connected to receive signals from the tape reader, a program stored in the memory of said computer and defining the cyclical sequential operations of engaging the tool with said rotating workpiece, causing displacement of said tool along said workpiece to machine a thread therein, and withdrawing said tool from engagement with said workpiece, said cyclical operations being performed at incrementally increasing thread depths from an initial rough cut to said final thread perimeter path, means in said computer responsive to said preparatory code to call said program from said memory upon reading of same, and means responsive to the tool reaching said final path to exit from said program.
Claim 14
Independent Claim
189 words
An apparatus for cutting a thread in a surface of a rotating workpiece comprising: means for rotating the workpiece, means for moving a tool along at least two axes relative to the workpiece, a tape reader for reading a part program tape containing blocks of information defining relative displacements between the tool and the workpiece, the limits of a final thread cutting perimeter path and a preparatory code for thread cutting operations, a programmable computer having a memory and being connected to receive signals from the tape reader, a program stored in the memory of said computer and defining the cyclical sequential operations of engaging the tool with said rotating workpiece, causing displacement of said tool along said workpiece to machine a thread therein, and withdrawing said tool from engagement with said workpiece, said cyclical operations being performed at incrementally increasing thread depths from an initial rough cut to said final thread perimeter path, means in said computer responsive to said preparatory code to call said program from said memory upon reading of same, and means responsive to the tool reaching said final path to exit from said program.
Claim 15
Dependent Claim
29 words
Apparatus as defined in claim 11 including a part program tape having at least three program blocks, each of said blocks containing indicia defining a thread cutting preparatory code.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |