Abstract
In the present research, the contact pressure characteristics of a hot stamping process was revealed by data mining an existing data base of verified FE simulation results, collected by a cloud-based finite element (FE) simulation platform. Following a data driven approach, a dedicated, novel testing scheme for a hot stamping process was developed and applied to determine the effect of contact pressure on the interfacial heat transfer coefficient (IHTC) between an AA7075 aluminium alloy and cast-iron tools. In this novel testing scheme, only one single IHTC test was required which has improved testing efficiency significantly.
Highlights
Aluminium alloys have been widely applied in the sheet hot stamping industry, and their heat transfer characteristics in such processes require a more thorough understanding
The interfacial heat transfer coefficient (IHTC) evolution as a function of contact pressure was predicted by the IHTC model, which could be implemented in the finite element (FE) simulations to precisely simulate the temperature evolutions and cooling rates of components during hot stamping processes
A variable contact pressure trend was determined by data mining an existing data base of verified FE simulation results, collected by the cloudbased finite element (FE) simulation platform Smart Forming, in order to satisfy the contact pressure characteristics of hot stamping processes
Summary
Aluminium alloys have been widely applied in the sheet hot stamping industry, and their heat transfer characteristics in such processes require a more thorough understanding. Different static contact pressure conditions were selected based on experience to determine the IHTC values, which would not satisfy the exact contact pressure conditions encountered in hot stamping processes, leading to a decrease in testing efficiency. Following a data driven approach, a dedicated, novel test scheme was developed and applied to determine the effect of contact pressure on the IHTC between a hot AA7075 aluminium alloy specimen and cold cast-iron tools in a single IHTC test, significantly improving testing efficiency. During the first time-period from 0 to 0.4 progression of hot stamping process, the contact area of the blank increased slowly from a small value and the contact pressure distribution was concentrated in the contact pressure range I from 0.4 to 0.8 MPa in terms of probability. The novel test scheme developed by using the data driven approach for the characterisation of the contact pressure dependent IHTC would significantly improve testing efficiency
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