Single-Lip Drill Retipping via Soldered Head Replacement
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Solution Overview
Problem
Deep-hole drills with one-piece hard metal components face premature wear due to high stress, limiting their service life and requiring frequent regrinding, which ultimately leads to disposal, especially given the expense and ecological concerns of the materials used.
Innovation Solution
A method for retipping single-lip drills by separating the worn hard metal head from the shank and attaching a new hard metal head using a soldering or adhesive tang, allowing for a stable and secure connection, thereby extending the drill's usability and reducing material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a one-piece hard metal drill is used to meet high stress and wear resistance requirements, then the drill can withstand high loads during deep-hole drilling, but the drill head wears out and must be disposed of after limited regrinding due to the taper and length constraints
Solution Approach 1:
The drill is divided into two separate components: a reusable drill shank and a replaceable drill head. The drill head can be detached from the shank after wear, allowing the shank to be reused with a new drill head, thereby extending the overall service life of the drilling tool system.
Solution Approach 2:
Instead of discarding the entire one-piece drill when the head wears out, the drill head is separated and discarded while the valuable drill shank is recovered and reused with a new drill head, reducing material waste and ecological impact.
2Duration of action of moving object
If the drill head is reground multiple times to extend service life, then the wear resistance is maintained temporarily, but the drill head length and taper eventually prevent further regrinding, requiring disposal
Solution Approach 1:
By separating the drill head from the shank, the drill head can be completely replaced rather than repeatedly reground. This eliminates the length constraint issue, as each new drill head starts with full length, allowing indefinite replacement cycles without consuming the shank length.
3Ease of repair
If a detachable connection between drill head and shank is introduced to enable replacement, then the drill head can be removed and replaced, but the connection mechanism adds structural complexity
Solution Approach 1:
The mechanical connection between drill head and shank is replaced with a material bond (soldering or adhesive bonding). This eliminates complex mechanical fastening mechanisms while providing a secure, reusable connection that allows easy replacement of the drill head by simply bonding a new head to the existing shank.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly extends the service life of single-lip drills, conserves expensive raw materials, and minimizes ecological impact by allowing the reuse of worn drills with new heads, reducing energy costs associated with new manufacture and waste generation.
Implementation Method 1
The drill head is attached by soldering or gluing
Implementation Method 2
The drill head is attached by soldering or gluing
Data Source
Figure 1~2
Figure 3a~3b
AI summary
A method for reloading a single-flute drill comprising a shaft (110) made of a hard metal and a drill head (120) that is connected to the shaft (110) and is made of a hard metal, is characterized by the following steps: - removing a worn drill head (120) from the shaft (110); - integrally bonding a new drill head (120) to the shaft (110).