Stator Hairpin Laser Machining with Clamped Cut-and-Weld Alignment
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Solution Overview
Problem
The challenge in electric motor stator assembly machining is to minimize poor welding and improve productivity by ensuring the ends of hairpins are aligned and fixed during cutting and welding, as misalignment leads to durability issues and increased defective rates.
Innovation Solution
A laser integrated machining system with a frame, alignment jig, cutting unit, welding unit, and vision examination unit, where the alignment jig fixes and rotates the stator assembly, clamps hairpins, cuts them to the same height, and then moves them for laser welding, reducing misalignment and enabling continuous machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hairpins are not clamped and fixed during cutting and welding, then the system structure is simpler and easier to operate, but the ends of hairpins become misaligned causing poor welding and reduced productivity
Solution Approach 1:
The clamping unit clamps the hairpins before cutting occurs, fixing them in position to prevent misalignment during subsequent welding operations. This preliminary fixing action ensures welding quality while maintaining a relatively simple system structure.
Solution Approach 2:
The system separates the hairpin processing into distinct functional units: clamping unit for fixing, cutting unit for cutting, and welding unit for welding. Each unit performs its specific function independently, improving welding reliability while keeping the overall system structure modular and manageable.
2Productivity
If multiple separate systems are used for cutting and welding, then each system can be optimized independently, but the standby time between operations increases and productivity decreases
Solution Approach 1:
The system merges the cutting unit and welding unit into a single integrated machining system that shares common components such as the frame, rails, fixing unit, and alignment jig. This allows continuous operation where cutting and welding follow each other without standby time, significantly improving productivity.
Solution Approach 2:
The integrated system enables continuous machining operations where the cutting unit cuts hairpins and the welding unit immediately welds them without interruption. The alignment jig maintains hairpin positions throughout both operations, ensuring continuous useful action and eliminating standby time between cutting and welding.
3Manufacturing precision
If hairpin ends are not aligned at the same height, then the alignment process is simpler and faster, but poor contact and poor welding occur reducing manufacturing precision
Solution Approach 1:
The alignment jig acts as an intermediary device between the fixing unit and the cutting/welding units. It provides a reference plane and guiding structures that automatically align hairpin ends at the same height, ensuring manufacturing precision while keeping the alignment mechanism relatively simple through the use of a single jig structure.
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 system minimizes poor welding by maintaining hairpin alignment and reducing standby time, thereby enhancing productivity through efficient movement and continuous cutting and welding processes.
Implementation Method 1
a welding unit configured to weld the cut hairpins
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(c)
AI summary
Proposed is a laser integrated machining system for a stator assembly, the system machining hairpins inserted in a stator in the order of aligning, cutting, examining, and welding. Accordingly, it is possible to minimize the standby time for welding ends of hairpins, and minimize poor welding and improve productivity by performing cutting and welding with hairpins clamped.