Replaceable Press-Forming Dies for Quantitative Damage Evaluation
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Solution Overview
Problem
Existing methods are insufficient for quantitatively evaluating die damage in press-forming, particularly for high-tensile steel sheets, as they are limited to a few hundred press-forming cycles, failing to accurately assess die life during mass production which involves several thousands of cycles.
Innovation Solution
A damage evaluation device and method using evaluation dies with replaceable die steel materials and surface coatings, capable of forming a hat-shaped cross-section, allowing for extensive press-forming cycles to simulate mass production conditions and observe die damage behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If existing evaluation methods (sliding test or press-forming test) are used, then evaluation can be performed with simple setup, but the number of press-forming cycles is limited to several tens to several hundred times, which is insufficient for evaluating die damage in mass production (several thousands to several tens of thousands of times)
Solution Approach 1:
The evaluation die is divided into multiple replaceable components (punch, die, insert parts) that can be independently replaced after a predetermined number of press-forming cycles. This segmentation allows the evaluation system to simulate mass production conditions over thousands of cycles by systematically replacing worn components, thereby extending the evaluation duration beyond the limited hundreds of cycles possible with conventional methods.
Solution Approach 2:
The patent implements a component replacement strategy where evaluation die components are discarded after reaching a predetermined number of press-forming cycles and replaced with fresh components. This approach enables continuous evaluation over thousands of cycles by recovering and replacing individual components rather than limiting the entire evaluation to the lifespan of a single die set, thus extending the evaluation duration to match mass production conditions.
2Reliability
If die steel material strength is increased to prevent damage, then die durability improves, but the load required for shearing increases and contact surface pressure to the die increases, leading to chipping, wear, or seizure
Solution Approach 1:
The patent applies different material properties to different parts of the evaluation die system. Specifically, various die steel materials with different strength levels are tested in different components (punch, die, insert parts), and surface coatings are applied selectively to specific contact surfaces. This allows optimization of local properties to balance durability against shearing load and contact pressure, preventing chipping, wear, and seizure without requiring uniform high strength throughout the entire die system.
Solution Approach 2:
The evaluation die system utilizes composite structures combining different die steel materials and surface coatings. By combining base die steel materials with protective surface coatings, the system achieves enhanced durability and resistance to chipping, wear, and seizure while managing the shearing load and contact surface pressure. This composite approach allows the die to withstand mass production conditions without requiring the base material to have excessively high strength.
3Adaptability or versatility
If various die steel materials and coating treatments are available from manufacturers, then selection options increase, but it becomes difficult to determine which combination is effective
Solution Approach 1:
The patent creates a universal evaluation platform that can systematically test and compare multiple die steel materials and surface coating treatments under identical mass production-simulated conditions. This standardized evaluation die system provides a common basis for assessing different material and coating combinations, enabling objective comparison and selection. The replaceable component design allows various materials and coatings to be tested in the same evaluation framework, resolving the difficulty of determining effectiveness among diverse options.
Solution Approach 2:
The evaluation system incorporates observation devices that detect and record damage behavior of different die steel materials and surface coatings during press-forming cycles. This feedback mechanism provides quantitative data on chipping, wear, and seizure for each material and coating combination, enabling systematic comparison and selection. The feedback from controlled evaluation over thousands of cycles transforms the previously difficult assessment into a measurable, data-driven selection process.
Data Source
AI summary
A damage evaluation device for a press-forming die includes: evaluation dies installed in a pressing device configured to press-form a metal material; and an observation device configured to observe damage behavior of a die steel material and surface coating constituting the evaluation dies. The evaluation dies include: a perforating unit configured to form a hole in the metal material; a first shearing unit configured to shear the metal material in which the hole is formed into a predetermined metal component shape; and a second shearing unit configured to separate a metal component from the metal material, and dies of the perforating unit, the first shearing unit and the second shearing unit are formed of the die steel material and have a structure that enables replacement with another die made of predetermined material and applied with predetermined surface coating treatment.