FIELD: working metals by cutting, multi-blade tools for finishing deep holes, for example in tube walls of heat exchange apparatuses for nuclear power plants.
SUBSTANCE: broach bit includes cutting multi-blade head coaxially mounted in one end of extending cylindrical tie rod. Said tie rod has auger threading in outer lateral surface. Minimum diameter of tie rod is selected according to conditions of material strength or its resistance to bending at axial compression value less than diameter of worked hole by 0.1 - 0.3 mm. Other end of tie rod may be mounted in spindle of drilling machine tool. Height of turn profile of auger threading in normal section may be in range 0.5 - 1.0 mm; its pitch is determined according to condition for supplying to cutting zone minimum necessary volume of cutting fluid. Auger threading on outer lateral surface of extending tie rod may be multi-start.
EFFECT: improved strength and quality of worked surface.
3 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF COOLING OF DRILL CUTTING PART FOR MACHINING OF DEEP HOLES AND DRILL INTENDED FOR ITS EMBODIMENT | 1998 |
|
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| TOOL DRILLING HEAD FOR DEEP DRILLING, IN PARTICULAR, TO DEEP DRILLING BY BTA TECHNOLOGY, AND TOOL FOR DEEP DRILLING | 2011 |
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| DEEP HOLES DRILLING APPARATUS | 2005 |
|
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| MIXER | 0 |
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| UNILATERAL CUTTING DRILL AND METHODS OF ITS MANUFACTURE (VARIANTS) | 1996 |
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| METHOD OF SEALING COOLANT-LUBRICANT FEED ASSEMBLY IN DRILLING DEEP HOLES | 2010 |
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| DYNAMOMETRIC REAMER | 0 |
|
SU778959A1 |
| DRILL ASSY | 0 |
|
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| EJECTOR SYSTEM OF DRILLING | 2008 |
|
RU2429948C1 |
