Metal tools and implements – making – Blank or process – Involving use of tap or die
Patent
1993-11-12
1996-05-14
Sipos, John
Metal tools and implements, making
Blank or process
Involving use of tap or die
470198, B23G 506
Patent
active
055157505
ABSTRACT:
A method of forming a threading tool for producing a thread of varying pitch in a work piece by relative rotary and axial movement between the tool and work piece. The tool is constructed to have a series of threading projections including a first series of pre-forming projections for initially producing a partial thread and groove in the work piece, and one or two final projections for reshaping the partial thread to have the varying pitch. The projections may be formed in two or more steps, including a first step of initially shaping both the pre-forming and final projections to an initial form, and a subsequent step of then removing material from one axial side of the pre-forming projections in a relation giving them a reduced axial thickness less than that of the final projection or projections, and to an extent such that, upon relative rotary and axial movement betwee- the tool and work piece, the preforming projections will at all times remain within the axial sectional profile of the thread groove of varying pitch ultimately formed by the final projections.
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"Tool Engineers Handbook--2nd Edition" by ASTME Publications Committee published 1959, pp. 46-1 to 46-41.
The Book "Practical Machine Shop" by John E. Neely, pp. 83 to 90 and 415 to 417.
"Machine Tools Processes and Applications" by Heineman and Genevro, pp. 42 to 46 and 210 to 212.
"Machine Shop Operation and Setups" by Lascoe, Nelson & Porter, pp. 64 through 69, shows and describes conventional.
Green William P.
Schoeffler Thomas C.
Sipos John
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