Miniature drilling bit and machining method thereof

Abstract

The invention discloses a miniature drilling bit and a machining method thereof. The miniature drilling bit comprises a drilling handle, a transition platform and a drilling needle which are connected in sequence, wherein the end part of the transition platform is connected with the drilling needle, and the root part of the transition platform is connected with the drilling handle; the diameter of the root part of the transition platform is larger than that of the end part of the transition platform; and at least one section of enlarged part is arranged on the transition platform from the end part to the root part, the diameter of a column body of the transition platform is gradually increased, and the length of the enlarged part is not less than 2 / 3 the total length of the column body. The invention has the advantages that the column body of the transition platform is in a structure form with a small front end and a large rear end, at least one section of enlarged part is arranged on the transition platform, the diameter of the column body is gradually increased, and the length of the enlarged part is not less than 2 / 3 the total length of the column body, so that most of the column body of the transition platform is gradually thickened, the strength of the transition platform is effectively enhanced, the drilling needle can not undergo deflection when in high-speed drilling, and the hole location performance of the drilling needle is improved.

Description

technical field [0001] The invention relates to the field of precision tool processing, in particular to a micro drill and a processing method thereof. Background technique [0002] Micro drills consist of a shank for holding and a drill pin for grinding the drilled holes, such as figure 1 As shown, earlier microdrills were all carbide type microdrills, that is, all parts of the drill bit were carbide (such as figure 2 shown). Later, a butt-welded micro-drill appeared, that is, the drill shank is made of steel, and the drill pin is made of cemented carbide with the same diameter as the drill shank. The two are welded, and then the drill pin is ground. This form can greatly save raw materials and reduce costs ( Such as image 3 shown). Since then, it is mainly in the form of plug-in welding, that is, the cemented carbide of the drill diameter part no longer uses the same cemented carbide cylinder as the drill shank, but uses a hard alloy cylinder that is much smaller tha...

AI Technical Summary

Problems solved by technology

[0007] For micro-drills, a highly precise processing device with a drill needle diameter of 0.1~3.175mm, the requirements for hole position accuracy are very high, especially when drilling at high speed, a little offset of the drill tip, drill needle and drill handle A small amount of bending deformation in the part will cause the drill bit to deflect too much, which will lead to a sharp drop in the performance of the drill bit, and have a great impact on the accuracy of the hole position.

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