Enhanced automated coolant supply system for CNC machining

Tan, Jian (2018) Enhanced automated coolant supply system for CNC machining. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Cutting fluid is a type of coolant and lubricant designed specifically for machining processes, such as milling and turning. The wet cooling technique is one of the coolant supply system, where a large amount of coolant is supplied directly to the workpiece and cutting tool during machining. An increase of tool life and surface roughness can be achieved by using the wet cooling technique. However, it will bring high maintenance cost, negative impact to the environment and operator. Thus, an automated coolant supply system for CNC machining is developed with some enhancement compared to the previous prototype to reduce the amount of coolant used. Time-based coolant supply system had been successfully constructed and tested. The nozzle connect with switch, valve and relay. An Arduino UNO microcontroller is used to control the relay. The switch is switched ON before the machining start. Then, the relay detects the signal received from the Arduino microcontroller and ON/OFF according to the pre-programmed. Two major experiments are carried out. One of the experiments is found the best combination of parameter that obtained from Taguchi method with unloaded coolant. Another experiment is using the best parameter run with the system by increasing the time interval from 1 second until 60 seconds. After the machining is done, the surface roughness testing based on the system is identified though the surface roughness tester. The best time interval for supplying and stop supplying the coolant is 30 seconds with the surface roughness value of 0.773 μm using with the spindle speed of 1200 rpm, feed rate of 100 mm/min and depth of cut of 0.4 mm. This system is extremely useful for all traditional flooding method. It ensures products with a better quality, reduction in consumption of coolant in this development system and increased tool life.

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