Combined hole making, threading, and chamfering tool with staggered thread cutting teeth
OwnerManuel C. Turchaninventor
Life of this patent
Estimating the term…
Abstract
Solid tungsten carbide is the popular material for these combinations tools. High resultant side forces on the tool during the thread milling phase are caused by relatively high circumferential engagement of the tool and a very low feed per tooth (chip thickness). A combined hole making, threading and chamfering tool with staggered thread cutting teeth doubles chip thickness and reduces side forces (resulting in less engagement), consequently allowing the feed rate to be increased while reducing thread milling time. In addition, this arrangement also reduces tool chatter, thus providing a smoother surface finish in the thread. In one form, the cutting teeth are formed on one or more removable inserts, facilitating replacement or substitution thereof.
Claims17
A workpiece forming tool comprising:
- a shank for engaging a holder of a machine system;
- a first land including a first thread cutting edge;
- and
- a second land including a second thread cutting edge, said first thread cutting edge and said second thread cutting edge being spaced apart 180 degrees;
- said first thread cutting edge being offset from said second thread cutting edge so as to define a plurality of staggered thread cutting teeth, said tool further comprising at least one removable insert, said first and second cutting edges formed on said at least one removable insert.
A combined hold making, threading a chamfering tool for forming a hole in a workpiece, the hole having a wall with threads and a chamfer, the tool comprising:
- a shank for engagement in a holder of a machine system;
- a body extending from said shank, said body having an outer surface and a distal end;
- hole making means formed on said distal end of said body;
- at least one flute formed on said outer surface of said body, said at least one flute extending longitudinally from said shank to said hole making means;
- a cutting insert-receiving picket formed on said at least one flute;
- at least one cutting insert removably attached to said cutting insert-receiving pocket, said cutting insert comprising a thread making cutting edge for forming the threads of the hole,
- said at least one cutting insert further includes a chamfer cutting edge for forming the chamfer of the hole.
A combined hole making, threading and chamfering tool for forming a hole in a workpiece, the hold having a wall with threads and a chamfer, the tool comprising:
- a shank for engagement in a holder of machine system;
- a body extending from said shank, said body having a distal end;
- hole making means formed on said distal end of said body;
- a first flute extending from said shank to said hole making means, said first flute defining a land having at least two staggered thread cutting edges axially offset at least two pitches apart and operative for cutting threads in the hole;
- and
- a second flute extending from said shank to said hole making means, said second flute defining a land having at least two staggered thread cutting edges axially offset at least two pitches apart and operative for cutting threads in the hole, said first flute and said second flute being spaced apart 180 degrees, said cutting edges of said first flute being offset with respect to the cutting edges of said second flute;
- further including at least one removable insert, said thread cutting edges being formed on said at least one removable insert.
Dependencies are inferred from the claim text.