Adjustable diamond chamfering drilling bit

Abstract

The invention relates to an adjustable diamond chamfering drilling bit which comprises a connecting parent part, a chamfering sleeve and the drilling bit. One end of the connecting parent part is provided with a connector which is matched with a connecting structure of a drilling machine; and the other end of the connecting parent part is connected with the chamfering sleeve and the drilling bit.A gap exists between the inner wall of the chamfering sleeve and the outer wall of the base of the drilling bit; a small water passing hole is arranged at the working position of the chamfering sleeve; and a main and auxiliary double-channel cooling water passageway ensures that the cooling water reaches all working surfaces in the whole machining process. A locating hole of the connecting parentpart is internally provided with a locating cambered surface and an eccentric cambered surface so as to facilitate the drilling bit to be assembled, rapidly centered and fastened. The connecting parent part and the chamfering sleeve are provided with locating recesses and locating bosses so as to ensure the concentricity of the connecting parent part and the chamfering sleeve, wherein the locating recesses and the locating bosses are mutually matched. The inner diameter of the chamfering sleeve is slightly smaller than the outer diameter of a diamond gear ring of the drilling bit so as to ensure the processing quality of a jointing line between the chamfering surface and the hole wall of a drilling hole. The same connecting parent part and the same chamfering sleeve can allow replacing adaptive drilling bits or adjusting the exposed length of the drilling bit so as to adapt to machining materials with different thicknesses. The adjustable diamond chamfering drilling bit is suitable for high-speed and high-accuracy machining of crisp and hard nonmetal materials which have strict requirements for stress concentration ratio.

Description

(1) Technical field [0001] The invention relates to a drilling tool, in particular to an adjustable diamond chamfering drill bit. (2) Background technology [0002] To complete drilling and chamfering of brittle and hard non-metallic materials, diamond drill bits are required. At present, there are three general tools: ①, ordinary diamond drill bit, ②, split combined diamond chamfering drill bit, ③, integral diamond chamfering drill bit. [0003] ①, Ordinary diamond drill bit [0004] It needs to be drilled first and then chamfered, and the two processes can be completed. In the case of accurate positioning, the processing quality of the chamfered surface and the intersection line between the chamfered surface and the hole wall is good. However, it is necessary to replace different tools and re-align, often resulting in eccentricity due to inaccurate center alignment, which can only be completed after accurate calibration and testing by skilled technicians, which not only...

AI Technical Summary

Problems solved by technology

[0020] In short, the existing diamond chamfering drill bits are difficult to complete the drilling and chamfering of brittle and hard non-metallic materials with high efficiency and high quality.

Images