Abstract
With the increasing demand for lightweight and lower fuel consumption and safety of automobile industry, lightweight materials of high strength steel (HSS) are more and more widely used. The hot stamping technology, which is determined by the inherent mechanical properties of high strength steel, makes molds prone to wear failure in the harsh service environments. In this paper, a finite element model is proposed for analyzing the value and distributions law of friction shear stress of contact surface of the pin disk. Through the simulation process of sliding wear, two kinds of different cladding materials of the pin specimens including H13 and Fe65, were experimented under three different loads by using the software ABAQUS. And then the pin-on- disk wear test at elevated temperature was conducted to verify the effectiveness of the simula-tion results. The results showed that the friction shear stress of pin with iron-based cladding and H13 steel was different under different loads, but the distribution was basically the same; the normal friction shear stress increased gradually along the direction of the pin movement, and the tangential shear stress increased gradually from the center of the pin to the outside of the circle; the value of the friction shear stress of the normal joints on the contact surface was periodically fluctuating in the whole dynamic analysis step, while it was basically stable in the tangential direction.
Highlights
IntroductionIn the mold industry, the surface coating technology is applied to prepare the super alloy coating on the surface of the mold, which can effectively improve the wear resistance of the mold surface, and improve the service life of the mold greatly [6] [7]
The results showed that the friction shear stress of pin with iron-based cladding and H13 steel was different under different loads, but the distribution was basically the same; the normal friction shear stress increased gradually along the direction of the pin movement, and the tangential shear stress increased gradually from the center of the pin to the outside of the circle; the value of the friction shear stress of the normal joints on the contact surface was periodically fluctuating in the whole dynamic analysis step, while it was basically stable in the tangential direction
From the previous simulation results, it can be seen that the distribution law of the friction shear stress in the tangential direction is the middle is small while the margin is large, and the decreasing direction is consistent with the sliding direction
Summary
In the mold industry, the surface coating technology is applied to prepare the super alloy coating on the surface of the mold, which can effectively improve the wear resistance of the mold surface, and improve the service life of the mold greatly [6] [7]. Various techniques such as PVD and CVD have been applied to the cladding of the wear resistant layer on the die surface. In this paper, combined with the hot stamping process conditions of high strength steel, the test parameters of the pin-on-disk in the high temperature wear test were used to simulate the value and distribution of the shear stress on the contact surface during the wear process, Which provided a theoretical basis for the determination of stress concentration area and wear area in wear process
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