Hot-Stamped Trim Line Layout for Lower Laser Machining Time
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Solution Overview
Problem
Cutting off the entire periphery of hot-stamped parts by laser machining increases machining cost and time, reducing productivity due to burrs and other issues.
Innovation Solution
A hot-stamped and trimmed part with a combination of laser trim lines and press trim lines connected via projecting corner portions, where one trim line has a recessed portion to intersect the other, allowing for stable connection and reduced machining requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the entire periphery is cut off by laser machining, then machining quality is improved, but machining cost and machining time increase, reducing productivity
Solution Approach 1:
The trim line is divided into two segments: a press trim line formed by shearing during hot pressing and a laser trim line formed by laser machining. This segmentation allows different portions of the periphery to be processed by different methods, combining the advantages of both approaches while avoiding their respective disadvantages.
Solution Approach 2:
Different portions of the periphery are treated differently: portions requiring high precision are processed by laser machining, while other portions are processed by shearing. The connection portion between the two trim lines is designed with specific geometric features (projecting corner portions with external angles of 20° to 60°) to ensure stable formation and avoid quality issues.
2Manufacturing precision
If the entire periphery is cut off by laser machining, then burrs are eliminated, but machining time increases, reducing productivity
Solution Approach 1:
Instead of applying laser machining to the entire periphery, only necessary portions are processed by laser, while other portions are processed by shearing. This partial application of the more precise but slower method reduces machining time while maintaining surface quality where needed.
3Shape
If trim lines are smoothly connected to form a straight line or arc, then shape continuity is improved, but variation in machining quality increases due to stepped portions and projections
Solution Approach 1:
The connection portion between the press trim line and laser trim line is designed with asymmetric geometric features (projecting corner portions with specific external angles of 20° to 60°). This asymmetric design ensures stable formation of the connection portion and avoids the creation of stepped portions or projections that would cause machining quality variation.
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 approach minimizes the need for extensive laser machining, reducing costs and time while maintaining machining quality by connecting trim lines through projecting corners and recessed portions, thus improving productivity.
Implementation Method 1
cutting off an excess outer peripheral portion by laser machining
Implementation Method 2
cutting in the laser machining
Implementation Method 3
forming by bending etc., post-machining
Implementation Method 4
hot pressing a blank
Data Source
AI summary
A hot-stamped and trimmed part is produced by hot pressing a blank and then cutting off an excess outer peripheral portion by laser machining, an outer peripheral shape of the hot-stamped and trimmed part includes a laser trim line formed by cutting in the laser machining, and a press trim line formed by shearing in the hot pressing or pressing performed before the hot pressing, and the laser trim line and the press trim line are connected via a projecting corner portion.