Screwdriver Head Laser Surface Alloying for Rigidity and Tenacity
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Solution Overview
Problem
Conventional screwdriver heads made of integral materials fail to simultaneously achieve high rigidity and abrasive resistance in the head portion and high tenacity in other portions, leading to inadequate performance and short service life.
Innovation Solution
A screwdriver head manufacturing method involving a first metal material with a laser surface alloying treatment to form an alloyed layer on the head portion, using an alloying coating rich in elements like W, Mo, Ti, V, and Al, which increases rigidity and abrasive resistance while maintaining high tenacity in other areas through low-temperature tempering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional screwdriver head is made of an integral material with uniform heat treatment, then the manufacturing process is simple, but the head portion cannot simultaneously achieve high rigidity, high abrasive resistance, and high tenacity
Solution Approach 1:
The patent applies different material properties to different parts of the screwdriver head by coating alloying material only on the head portion surface. The laser surface alloying treatment creates an alloyed layer with high rigidity and abrasive resistance on the head portion, while the basal body maintains its original material properties for high tenacity. This local differentiation resolves the contradiction by providing tailored properties where needed without complicating the overall manufacturing process.
Solution Approach 2:
The patent creates a composite structure by combining the base metal material with an alloyed surface layer. The alloyed layer formed through laser surface alloying contains alloying elements that provide enhanced rigidity and abrasive resistance, while the underlying basal body material provides tenacity. This composite approach allows simultaneous achievement of multiple contradictory properties in different regions of the same component.
2Strength
If the head portion is made with high rigidity material, then abrasive resistance improves, but tenacity in other portions deteriorates
Solution Approach 1:
The alloying coating is applied selectively only to the head portion surface, creating a localized alloyed layer with enhanced abrasive resistance. The basal body remains unchanged and retains its original material properties including high tenacity. This spatial separation of property enhancement resolves the contradiction between abrasive resistance and tenacity.
3Strength
If laser surface alloying treatment is conducted on the head portion, then rigidity and abrasive resistance are enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces conventional mechanical surface treatment methods with laser surface alloying technology. The laser beam provides precise, localized heating and alloying without mechanical contact, enabling rigid control over the treatment zone. This substitution maintains manufacturing efficiency while achieving the desired rigidity enhancement in the head portion.
4Strength
If alloying coating is applied on the head portion surface, then abrasive resistance increases, but manufacturing time increases
Solution Approach 1:
The laser surface alloying treatment is applied in a controlled, periodic manner with specific parameters (laser power, scanning speed, hatch distance) optimized to achieve the desired alloyed layer thickness and properties in minimal time. The process parameters are carefully selected to balance quality enhancement with manufacturing efficiency, reducing the overall cycle time while still achieving the required abrasive resistance.
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
The method results in a screwdriver head with enhanced rigidity and abrasive resistance in the head portion and high tenacity in other areas, significantly extending its service life by forming a cryptocrystalline martensite structure with minimal defects, as demonstrated by reduced wear after extensive use.
Implementation Method 1
During the laser surface alloying treatment conducted on the surface of the head portion of the screwdriver head, a laser beam first melts the alloying coating containing the alloy elements such as W, Mo, Ti, V and Al and a surface layer of the head portion of the screwdriver head close to the coating
Implementation Method 2
a laser beam first melts the alloying coating containing the alloy elements such as W, Mo, Ti, V and Al and a surface layer of the head portion of the screwdriver head close to the coating
Implementation Method 3
conducting low temperature tempering treatment on the screwdriver head after the laser surface alloying treatment
Data Source
AI summary
The present invention discloses a method for manufacturing a screwdriver head, the screwdriver head including a head portion for being inserted into a slot of a screw head and a basal body for supporting the head portion; the manufacturing method including: providing the screwdriver head made of a first metal material; preparing alloying coating; coating the alloying coating on the surface of the head portion of the screwdriver head; conducting laser surface alloying treatment on the surface of the head portion coated with the alloying coating to form an alloyed layer; and conducting low temperature tempering treatment on the screwdriver head after the laser surface alloying treatment. The present invention further discloses a screwdriver head, the surface of the position at which the head portion of the screwdriver head contacts with the slot of the screw head is provided with an alloyed layer formed through the laser surface alloying treatment. The screwdriver head manufactured by the manufacturing method of the present invention has high rigidity and high abrasive resistance in the head portion and high tenacity in other portions, thereby prolonging the service life.