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Research of Co loss of cemented carbides progressive die in high-speed stamping
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Die wear, especial progressive die wear is a major concern in the stamping industry in respect that it brings many problems, including shortened service life, wasted energy, increased production cost and lowered production efficiency. Alleviating die wear can increase the die inserts’ service life and is helpful to avoid frequent replacement of worn inserts and hence reducing the corresponding costs. WC-Co cemented carbide has good wear resistance and flexibility and is the most common used material for making progressive dies, but the die wear is still a prominent problem, especially in high-speed stamping. Some researches have shown that the appropriate content and even distribution of Co phase are very important to the performance of WC-Co cemented carbides. This paper is conducted to investigate the wear status and mechanism of WC-Co cemented carbides progressive die in high speed stamping. At first, the high-speed stamping test for WC-Co cemented carbides progressive die is carried out to get worn samples. Then the tool microscope is used to observe the surface pattern of the worn cutting edge of the tools. The scanning electron microscope is used to analysis the difference of microstructure of cutting edge of the progressive die both in unworn region and in worn region. The energy spectrometer is used to detect the relative percentage composition of Co and W elements on the cutting edge surface of the progressive die. The results showed that : (1)The macro and microstructure of cemented carbides progressive die change after long time and high speed stamping (2) There are some small macro pits on the worn cutting edge. (3) The percentage composition of Co element in the worn region decreases. Finally, the Skeleton Theory and Composite Reinforcing Theory are used to analysis the effect of the Co loss. The research shows that the Co loss of cemented carbides in high-speed stamping is an important factor affecting the wearing and property of progressive - ie.24097
2. An intelligent system for automatic modeling of progressive die
The present paper describes an intelligent system AUTOPROMOD developed for automatic modeling of progressive die. The proposed system utilizes interfacing of AutoCAD and AutoLISP for automatic modeling of die components and die assembly. The system comprises eight modules, namely DBMOD, STRPRMOD, BPMOD, PPMOD, BBDSMOD, TBDSMOD, BDAMOD and TDAMOD. The system modules work in tandem with knowledge-based system (KBS) modules developed for design of progressive die components. The system allows the user firstly to model the strip-layout and then utilizes output data files generated during the execution of KBS modules of die components for automatic modeling of progressive die. An illustrative example is included to demonstrate the usefulness of the proposed system. The main feature of the system is its facility of interfacing die design with modeling. A semiskilled and even an unskilled worker can easily operate the system for generation of drawings of die components and die assembly. System modules are implementable on a PC having AutoCAD software and thus its low cost of implementation makes it affordable for small and medium sized stamping industries.论文网
3 An automated design system for progressive die
Research highlights ：
— Proposed system is capable to automate all major activities of progressive die design.
— System is developed using production rule based KBS approach of AI.
— Low cost of implementation makes it affordable by even small scale industries.
— Knowledge base can be modified easily to accommodate advances in stamping technology. Abstract This paper describes an automated design system developed for design of progressive die. The proposed system is organized in 27 knowledge-base modules. The production rule based knowledge-base system (KBS) approach is utilized for constructing the system modules. Modules are user interactive and designed to be loaded into the prompt area of AutoCAD. The system is capable of automating all major activities of design of progressive die such as checking the design features of sheet metal parts, design of strip-layout, selection of progressive die components, modeling of die components and die assembly, and selection of materials for progressive die components. The system is implemented on a PC having AutoCAD software and therefore its low cost of implementation makes it affordable by small and medium size enterprises.