PCD (pitch circle diameter) drill bit with chip breaker groove

Abstract

The invention discloses a PCD (pitch circle diameter) drill bit with a chip breaker groove, which comprises a shank, a cutter body and PCD blades, wherein two cooling liquid holes are formed in the axial direction of the cutter body and penetrate through the shank and the cutter body; two chip pockets are formed on the cutter body in the axial direction thereof, are oppositely symmetrical in an end-view, occupy one quadrant of circle; the two PCD blades are embedded at the front end of the cutter body as drill lips in a welding way; the vertex angle at the drill tip is 130 degrees; the relief angle at the end edge of the drill bit is 8 to 12 degrees; the angle of a chip separating groove is 10 degrees; a PCD round blade is 0.3 mm; the relief angle of the round blade is 15 degrees; a round blade of the cutter body is 0.5 mm; and a chip breaker groove which has a 15-degree front angle and the width of 1 mm is formed at the place which is 0.11 mm near the end edge of the drill bit on a PCD upper surface. When the PCD drill bit is used for cutting machining, as the end edge of the drill bit has the function of chip breaking, the original long chip can be turned into short chip to be smoothly discharged from a chip space without scratching a hole wall, so that the surface roughness of the hole can be improved, the accuracy class requirement of the hole can be easily met, a lot of machining time can be saved, and the production cost can be reduced.

Description

technical field [0001] The invention relates to a machining tool, in particular to a PCD drill bit with a chip breaker. Background technique [0002] In pure aluminum or aluminum alloy valves with low silicon content IT7 grade precision hole processing, because the material is soft and sticky, it is not easy to break chips, long strips of fine chips that appear during drilling will accumulate in the tool flute for a long time, and It will wrap around the tool and scratch the hole wall, causing the surface roughness of the hole to fail to meet the requirements of the drawing. In order to improve the surface roughness, a reamer is used for correction, which is inefficient and cannot meet the requirements of mass production. Contents of the invention [0003] The invention overcomes the deficiencies in the prior art and provides a PCD drill bit with a chip breaker. [0004] In order to solve the above-mentioned technical problems, the present invention is achieved through th...

AI Technical Summary

Problems solved by technology

[0002] In pure aluminum or aluminum alloy valves with low silicon content IT7 grade precision hole processing, because the material is soft and sticky, it is not easy to break chips, long strips of fine chips that appear during drilling will accumulate in the tool flute for a long time, and It will wrap around the tool and scratch the hole wall, causing the surface roughness of the hole to fail to meet the requirements of the drawing. In order to improve the surface roughness, a reamer is used for correction, which is inefficient and cannot meet the requirements of mass production.

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