To Study about the Residual Stresses in Hybrid Layer Manufacturing.
Keywords:
RM, HLM, Induction Pre-heating , Residual Stresses, MIGAbstract
This paper is on rapidly emerging, manufacturing technology that is alternatively called as Rapid manufacturing (RM). RM is proven to be an effective tool that will reduce time and expense involved in the manufacturing of anew products and to overcome the bottlenecks of existing Production processes. It reduces Supply Chain( from just-in-time logistics to “just-in place“ manufacturing) in this way RM fits Industry 4.0 purposes. AM is facing many limitations one of them is that we are not getting good surface finish in AM this is the biggest drawback. So , Hybrid Layered Manufacturing (HLM) is a solution for this major problem .It is a type of RM process used for metals which is a integration of additive and subtractive manufacturing techniques. The integration is been done by weld-deposition using Metal Inert Gas (MIG) as an Metal additive process in existing CNC machine without disturbing its other capabilities. After the deposition of near net shape i.e by Metal Addition, the machining process i.e Metal Subtraction is done by CNC Milling. In HLM, Solidification cracking in the substrate is the common issue after weld deposition .The main reason for solidification cracking is accumulation of Residual stresses. So the main goal of the present work is to manage the Residual stresses of products produced in hybrid layered manufacturing. Residual Stresses arises due to the difference in coefficient of thermal expansion between two materials linked together and temperature gradient resulting in differential rates of expansion or contraction within the volume of the material.
Residual Stresses in Welding can be reduced by controlling some preventive and Curing Techniques. I m going to investigate on induction pre heating as a preventive technique for hybrid layer manufacturing .Electric arc welding deposition bed with preheating is a promising development in Hybrid Layer Manufacturing (HLM), mainly applied to avoid large thermal stresses in the material.
