Threaded bolt and method for its production
AssigneeNewfrey LLC
InventorsJoachim GEIST, Joachim SCHNEIDER, Wolfgang WERNER
Life of this patent
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Abstract
A threaded bolt may be produced according to a method including the steps of: forming a cylindrical bolt blank of metal with a root end and a head end, and with a section of the bolt blank adjoining the root end that is reduced in diameter up to a region designed for the formation of lead-in flights. Then, in a first rolling phase, partially form the principal thread flights and the lead-in thread flights using a first pass of flat jaws of a thread rolling machine. Then, in a second rolling phase, fully form the principal flights and the lead-in flights and forming grooves.
Claims3
A method of producing a threaded bolt, the method comprising:
- forming a cylindrical bolt blank of metal with a root end and a head end such that a section of the bolt blank adjoining the root end is reduced in diameter up to a region designed for the formation of lead-in flights;
- partially forming principal flights and the lead-in flights in a first rolling phase using a first pass of flat jaws of a thread rolling machine;
- fully forming the principal flights and the lead-in flights and forming grooves in a second rolling phase.
Dependencies are inferred from the claim text.