Press Die Coating Layout for Clearance and Durability
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Solution Overview
Problem
Pressing dies face challenges in managing clearance and achieving high working durability due to the limitations of existing surface treatment films like DLC and diamond films, which either lack durability or are difficult to dimensionally control.
Innovation Solution
A pressing die with a diamond film on the die part and a DLC film with a Vickers hardness of 1000 to 8000 Hv on the punch part, facilitated by a coolant with ≤4.0% oil content, allows for precise clearance management and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a DLC film is formed on the die part or punch part, then adhesion suppression is improved, but working durability deteriorates
Solution Approach 1:
The patent applies different surface treatment films to different parts of the pressing die based on their specific functional requirements. The die part receives a diamond film for durability, while the punch part receives a DLC film for adhesion suppression. This local differentiation resolves the contradiction by optimizing each component's surface treatment according to its specific operational demands rather than applying a uniform treatment across the entire die system.
2Duration of action of stationary object
If a diamond film is formed on the die part or punch part, then working durability is improved, but dimension control deteriorates
Solution Approach 1:
The patent strategically applies diamond film coating only to the die part where high durability is critical, while leaving the punch part with DLC coating or base material for better dimensional stability. This localized application approach allows the system to achieve high working durability in the die part without compromising the overall dimension control of the pressing die assembly.
3Manufacturing precision
If severe clearance management is demanded for thin can body parts, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent achieves severe clearance management by modifying the surface treatment parameters of the die components. The diamond and DLC films provide controlled expansion and friction characteristics that enable precise clearance control during pressing operations. This approach maintains manufacturing precision through material property modification rather than increasing mechanical complexity of the die 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
The combination of diamond and DLC films on the die and punch parts, respectively, enables effective clearance adjustment and high working durability, reducing abrasion and adhesion, even in harsh environments with minimal oil content.
Implementation Method 1
a work material is press shaped in a state in which the punch part and the die part are spaced from each other with an appropriate clearance interposed therebetween
Implementation Method 2
it is desirable that a material that has a high sliding characteristic and can suppress adhesion upon pressing by the work material is selected suitably
Implementation Method 3
superior working durability is obtained
Implementation Method 4
an oil content in the coolant is equal to or lower than 4.0 volume percent
Data Source
Figure 1~2
AI summary
[Object] A pressing die and a press working method that can achieve both facilitation of management of an appropriate clearance and working durability at a high level are provided. [Solving Means] The pressing die of the present invention is a pressing die for press working a metal material using a punch part and a die part. A working surface of one of the punch part and the die part is coated with a diamond film the working surface contacting with the metal material. A working surface of the other one of the punch part and the die part is coated with a surface treatment film having a Vickers hardness of 8000 Hv or less the working surface contacting with the metal material.