Pengembangan Ruang Pencampuran Unit MQL Untuk Meningkatkan Ketermesinan Baja Paduan pada Pembubutan Keras Menggunakan Pahat Cermet

Abstract

Minimum Quantity Lubricant (MQL) is an upcoming lubrication/cooling technology in environmentally responsive machining. The use of the MQL system with a Mixing Chamber where the cutting fluid and air are first mixed in a chamber before being ejected by the nozzle into the cutting zone. So far, the MQL unit used by previous researchers [4-12] is a multi-functional MQL unit and can use multiple cutting fluids to improve machining processes in general. In this research proposal, an MQL unit with a mixing chamber will be developed which is designed according to the hard machining characteristics of alloy steel. The Mixing Chamber will be designed to produce a mist that can compensate for the harsh machining characteristics of high cutting temperatures which cause high tool wear rates. The research objective is to improve the machinability of alloy steel on hard turning using a cermet chisel. The research method includes the design and manufacture of the MQL Unit and System Development in a spray chamber on a nozzle that is connected directly by a computer. Tests using PVD-TiN/TiCN/TiN coated cermet chisels. The test criteria include tool wear (VB), surface roughness (Ra) and data analysis with Minitab Taguchi. The result is an automatic and efficient spraying of cutting fluid into the cutting area. During the cutting process, the coolant volume can be adjusted as needed. The air pressure during the cutting process can automatically be controlled in the air storage room so that it greatly facilitates the cutting process on the workpiece and also in accordance with the needs and the amount of air pressure. The results of the readings such as the amount of cutting fluid, air pressure, and cutting power are automatically saved to the software so that it will facilitate the process of retrieval and storage of data. The results of the performance performance resulted in VB values, namely v 140 m/min, f 0.2 mm/rev, P 4 bar and Q 80 ml/hour. And the Ra value is found at the value of v 100 m/min, f 0.1 mm/rev, p 8 bar and Q 80 ml/hour. This MQL design is recommended for a pollution-free machining environment. This MQL design minimizes environmental impact and significantly reduces fluid usage and most importantly eliminates the need for coolant maintenance and disposal. Because the thin layer of MQL lubricant is very important to reduce friction and heat.