MATE306-MATL952 - Sliding Direction of The Cylinder Liner-Piston Ring - Engineering Assignment Help

Assignment Task

Question 1.

Figure 1 shows the working assembly and sliding direction of the cylinder liner-piston ring sliding pair. Read the 1987 paper on cylinder wall and piston in Moodle folder-assignment 1. Parts 1-6 of the 1987 paper are literature review and parts 7 to the end are experimental work done by the authors. Answer the following question based on the information from the paper and the first three weeks of lecture.

A sketch of engine cylinder and piston

a. What are the materials used for the piston rings and cylinder liners in research reported in the paper? 
b. What are the major wear mechanisms (not including corrosion) in the cylinder- piston ring wear situation? Explain why (from your own judgement). 
c. What are the main processes of breaking-in between cylinder walls/liners and rings?
d. In Table 1 in Page 71, what is the likely composition of the surface layer formed on the cylinder wall at above 300kPa nominal contact pressure conditions that apparently helped with wear resistance?

Question 2. 

In a pin on disk test as shown below, a mild steel disk (Fe-0.2 wt% C) in annealed status is worn against a bearing ball (Quench and tempered SAE 52100 steel). Track surface of the mild steel disk is shown as below (right).

1. Explain what is the main wear mechanism judging from the material match and wear track morphology and why.
2. Explain why there are dead-end trenches as shown in the circle.

Question 3

In mining industry, chutes and transfer belts are frequently used for transfer of mineral rocks. In a mining site, engineers found that the liner plate of the circled part of a chute always erode through prematurely and the whole process has to be stopped frequently to replace the liner plate and caused a financial lose. The chute is shown in the following photos. The company is currently using a quenched and tempered high carbon alloy (500BHN plates). The leading engineer is suggesting a change of tempering condition to improve the service life of the plates. It is know that the tempering temperature is 500 °C for 1 hour.

1. Can you propose a plan of a trial to vary the tempering temperature and time to improve the performance (and explain why).
2. Suggest a different material to tackle this problem and explain why.

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