Hole machining ejector drill system and drill bit thereof

Abstract

The invention belongs to the field of hole machining, and particularly relates to a hole machining ejector drill system and a drill bit thereof, which are used for improving the machining capacity andquality of holes. The drill bit is connected to a drill rod, an inner pipe is a scrap iron discharge channel, an annular channel for chip liquid to flow in is formed between the inner pipe and an outer pipe for oil supply, oil through holes are distributed in the drill bit along the circumference, one part of cutting fluid flows to the cutting edge part, the other part of the cutting fluid is obliquely sprayed backwards, a plurality of wedge-shaped protrusions are arranged on the drill bit along the circumference, the wedge-shaped protrusions and the inner wall of a machined deep hole form awedge-shaped space, and a wedge-shaped oil film is formed when oil liquid flows through the wedge-shaped space. The distance between the wedge-shaped protrusions and the inner wall of the machined deep hole is very small or equal to zero, the self-centering force of the drill bit is finely adjusted through an adjusting cushion block, a positioning piece and the screw rod as required, the liquid force is large and convenient to estimate, the drill bit is high in self-centering precision and good in self-correcting effect, the precision of a cutter system is easy to guarantee and high-speed rotation can be realized, and the length of the drill bit is larger than that of an existing corresponding drill bit of the ejector drill.

Description

technical field [0001] The invention belongs to the field of hole processing, and in particular relates to a hole processing spray-suction drill system and a drill bit thereof. Background technique [0002] Compared with external surface machining, chip removal is more difficult in hole machining. Iron filings can be discharged by means of the flow of liquid. And increasing the pressure difference of the liquid can improve the chip removal effect. [0003] The lubrication forms of bearings include dynamic pressure lubrication and static pressure lubrication. Hydrostatic lubrication uses an oil pump to supply high-pressure fluid to separate the journal from the wall of the bearing bore. The working principle of dynamic pressure sliding bearing is different from that of static pressure lubrication, and its principle has enlightenment for deep hole machining. During dynamic pressure lubrication, the rotation of the journal brings the lubricating oil into the friction surfac...

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Problems solved by technology

[0002] Compared with external surface machining, chip removal is more difficult in hole machining

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