Casing bit
JP2026009652APending Publication Date: 2026-01-21ALLOY INDS
-1 Cites -1 Cited by
Patent Information
- Application Number
- JP2024109682
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2026-01-21
AI Technical Summary
Technical Problem
Casing bits made of cemented carbide are vulnerable to impacts and wear out quickly, leading to reduced excavation efficiency and difficulty in drilling due to chipping and breakage of the cutting edge.
Method used
The casing bit design features a tip with three or more flat inclined surfaces forming a single apex, with chamfered portions facing forward and left/right, and a negative rake angle, ensuring the chamfered portions are fully exposed, enhancing impact resistance and cutting efficiency.
Benefits of technology
The design prolongs the lifespan of the tip by allowing it to withstand impacts and wear, maintaining effective drilling performance until the chamfered portions are completely worn down, thus extending the bit's life.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026009652000001_ABST
Abstract
To prolong a service life by making the most of high wear resistance while compensating weakness to impact.SOLUTION: In a casing bit 11 having a bit main body 13 fixed to the tip of a casing pipe and a tip 15 held by the bit main body 13, four flat inclined surfaces 53 constituting one apex part 52 and chamfered parts 54 between them are provided on the tip part 51 of the tip 15. Two chamfered parts 54 at opposite positions are directed in the longitudinal direction corresponding to the circumferential direction of the casing pipe, and the other two chamfered parts 54 are directed in the lateral direction. The chamfered portion (54) facing in the front-rear direction and the chamfered portion (54) facing in the left-right direction are formed in a linear shape elongated in the vertical direction corresponding to the length direction of the casing pipe when viewed from the front-rear direction and the left-right direction, respectively, and the axis passing through the apex portion (52) is oriented in the vertical direction. Further, the rake angle is set to a negative rake angle, and all of the chamfered portions 54 converging to the apex portion 52 are entirely exposed from the flat distal end surface 34 of the bit body 13.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art