Low-stress cavity for conical connection of drill bits
DE602021038387T2Inactive Publication Date: 2025-09-10SANDVIK MINING & CONSTR TOOLS AB
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Patent Information
- Application Number
- DE602021038387
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2020-09-30
- Filing Date
- 2021-09-30
- Publication Date
- 2025-09-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Technical Problem
Existing conical frictional connections in drill bits for percussive drilling lead to high stress concentrations, increasing the risk of fracture and detachment, thereby reducing the drill bit's lifetime and disrupting the connection with the drill rod.
Method used
A percussive drill bit design featuring a sleeve section with a conical cavity that includes multiple curved connection regions with varying radii, reducing stress concentrations by transitioning smoothly from the conical to the cylindrical region, thereby maintaining a secure connection.
Benefits of technology
The design effectively reduces stress concentrations, minimizing the risk of fracture and detachment, thus extending the drill bit's lifetime and ensuring a stable connection with the drill rod.
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