چكيده به لاتين
The ability to produce a quality product based on output parameters such as surface roughness and dimensional and geometric tolerances are evaluated. So that life and how it is applied in a series of notes taken. In fact, tolerance features are the most important factors in shop drawing of an industrial part.
The aim of this study is to study and compare the quality of the hole produced by the helical milling as a new process with drilling process on the super alloy N-155. Helical milling is a process to make a hole by moving the milling tool throw a helical path. Responsible method system was utilized to study the effects of parameters such as: cutting speed, feed rate and axial depth of cut on helical milling and cutting speed and feed rate on surface roughness, dimensional, geometrical tolerances and white layer of the holes produced in the convetional drilling. In order to complete the investigation of the mention processes, the shape of burrs was studied. The results indicated that the helical milling as high performance process, extends the surface quality of the hole to 0.25 µm of (Ra) and omit The finishing processes. Dimentional tolerances in drilling and geometrical tolerances in helical milling are in more desirable Situation. Also white layer has greater thickness in helical milling process. The relation between machining parameters and out put variable (white layer) considering the simulation response method and variance analysis indicated that a linear model is able to estimate variation of the thickness of the white layer more accurate by the use of experimental results. According to the results it is advised to replace the drilling process of the super alloy N-155 with the helical milling as a more effective and high effiency process which reduces the cost and time of the process.
Keywords: Helical milling, Conventional drilling, responsible system method, surface roughness, dimensional and geometrical tolerances, white layer
