Ring Band Saw Blade Tooth Tip Forming After Weld Distortion
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Solution Overview
Problem
The manufacturing of ring-shaped band saw blades often results in shape accuracy issues and surface quality deterioration due to thermal distortion and uneven welding, leading to poor cut surface quality and orbiting tool marks.
Innovation Solution
A manufacturing method and apparatus that involves welding the band saw blade ends to form a ring shape, followed by polishing the inner, outer surfaces, and end face to stabilize the shape, and then joining and polishing the cutting tip to form precise tooth tips using the polished surfaces as references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the band saw blade is welded to form a ring shape, then the continuous cutting function is improved, but shape accuracy deteriorates due to thermal distortion
Solution Approach 1:
The patent applies preliminary action by performing the polishing step before the welding operation. The inner surface, outer surface, and end face are polished in advance to establish accurate reference surfaces before thermal distortion occurs during welding. This ensures that the tooth tips can be positioned accurately relative to these pre-polished references, compensating for the subsequent thermal distortion from ring formation welding.
2Strength
If the cutting tip is joined to tooth tips using welded band saw blade, then the cutting performance is improved, but shape accuracy of tooth tips deteriorates due to distortion from thermal treatment
Solution Approach 1:
The polishing of reference surfaces (inner surface, outer surface, end face) is performed before the cutting tip joining operation. This preliminary establishment of accurate reference surfaces allows for precise positioning of multiple tooth tips during the subsequent cutting tip welding process, compensating for thermal distortion that occurs during the joining operation.
3Duration of action of moving object
If the opposite ends of band saw blade are welded to form ring shape, then the endless cutting capability is improved, but surface quality deteriorates due to bulging and unevenness
Solution Approach 1:
The inner surface and outer surface are polished before the ring formation welding operation. This preliminary polishing establishes smooth reference surfaces that will not be adversely affected by subsequent welding bulging, as the tooth tip positioning relies on these pre-polished surfaces rather than surfaces created or modified after welding.
Solution Approach 2:
The patent acknowledges that welding bulging will occur but converts this potential harm into a benefit by establishing the reference surfaces before welding. The pre-polished surfaces serve as stable references that are independent of welding-induced unevenness, effectively isolating the tooth tip positioning accuracy from the welding surface defects.
4Ease of manufacture
If the band saw blade is used with distorted shape from thermal treatment, then the manufacturing process is simplified, but the cut surface quality deteriorates
Solution Approach 1:
The patent performs polishing of reference surfaces before welding and tooth tip joining operations, establishing accurate references in advance. This allows the use of distorted blade bodies from thermal treatment without compromising tooth tip positioning accuracy, as the pre-established references remain stable despite subsequent thermal distortion.
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 ensures high accuracy in tooth tip formation and reduces surface unevenness, preventing orbiting tool marks and achieving satisfactory cut surface quality.
Implementation Method 1
ring forming step of welding opposite ends of a band saw blade including a body part having a band shape
Implementation Method 2
polishing step of polishing an inner surface, an outer surface, and an end face on a side opposite to the tooth part
Data Source
AI summary
A ring forming step includes welding opposite ends of a band saw blade including a body part having a band shape, and a tooth part including a plurality of teeth formed on one side part of the body part, to form a ring shape. A polishing step includes polishing an inner surface, an outer surface, and an end face on a side opposite to the tooth part in the ring-shaped band saw blade subjected to the ring formation. A tip tooth tip forming step includes positioning, after the polishing step, the ring-shaped band saw blade subjected to the ring formation by use of one of the inner surface and the outer surface, and the end face as references, joining a cutting tip to tooth tips of the plurality of teeth by welding, and polishing the joined cutting tip to form a tooth tip shape.