A Review on Possible Increment of Heat Transfer Rate for Hydraulic Oil Used in Plastic Injection Moulding Machine

In present study, the effect of oil temperature of the hydraulic system for Plastic Injection Moulding Machine is studied. Traditionally, in India, the hydraulic oil VG-68 for Plastic Injection Moulding Machine is used, which has an optimum temperature range with desired effective viscosity property in between 40C to 50C. The oil temperature goes higher up to 55C and even higher than that during the summer, which is not desirable for the machine operations. It is found that the operation of the machine gets sluggish as the oil viscosity get decreases due to continuous flow and heavy production schedule. The oil needs to be cooled down as fast as possible from the elevated temperature to required temperature. The problem was initially solved by use of a heat exchanger which turned out to be a costly affair. The alternative method for getting the temperature drop up to the desired level is extended surface heat transfer through the flow of oil in the return path. The method is prominently permissive for elimination of the expensive heat exchanger usage. This paper critically examines the feasibility of such alternative methods on the basis of reported work of the past with similitude.