Drill with coolant holes

A technology for cooling holes and drill bits, which is applied in drilling/drilling equipment, drill repairing, twist drills, etc. It can solve problems such as accelerated wear, insufficient cooling fluid distribution, and decreased hole processing accuracy to achieve effective lubrication and cooling. , promote the increase, and promote the effect of supply
CN102802853AInactive Publication Date: 2012-11-28MITSUBISHI MATERIALS CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
MITSUBISHI MATERIALS CORP
Publication Date
2012-11-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

A drill provided with coolant holes, comprising: a drill body rotating about the axis thereof; cutting edge sections having top clearance surfaces; cutting debris discharge grooves each having a front groove-wall surface facing forward in the rotational direction of the drill body and also each having a rear groove-wall surface facing rearward in the rotational direction; cutting edges each formed at the ridge at which a front groove-wall surface and a top clearance surface intersect each other; land sections each formed between the cutting debris discharge grooves adjacent to each other in the rotational direction; and coolant holes formed by boring in the land sections and open in the top clearance surfaces. The coolant holes each include: a front hole-wall surface located ahead in the rotational direction and having a constant distance to the front groove-wall surface of a cutting debris discharge groove; a rear hole-wall surface located behind the rotational direction and having a constant distance to the rear groove-wall surface of a cutting debris discharge groove; and an outer peripheral hole-wall surface located on the outer peripheral side of the drill body and having a constant distance to the outer peripheral wall surface of a land section.
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Description

technical field

[0001] The present invention relates to a drill with a cooling hole in which a cooling hole for supplying a cooling fluid such as a cutting oil is formed in a cutting edge portion of a front end portion of a drill main body for drilling.

[0002] This application is based on Japanese Patent Application Nos. 2009-142441, 2010-095374, 2010-095375, and 2010-095376 filed in Japan on April 16, 2010, filed in Japan on June 15, 2009 Priority is claimed and its contents are hereby cited. Background technique

[0003] In drills with cooling holes, the cooling holes are generally mostly circular in cross-section. In order to achieve an increase in the supply amount of the cooling liquid and efficient supply, for example, Patent Document 1 proposes that the axial cross-sectional shape of the cooling hole is such that the distance between the inner wall surfaces gradually decreases from the approximate center of the cooling hole toward the center of rotation. droplet s...

Claims

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