If you must use coolant, you will need to use a cutting tool material with a higher Cobalt content. The higher Cobalt/Marshmallow allows the tool to manage the rapid temperature changes and expansion and contraction without cracking. Be careful though, tools with higher Cobalt content typically must be run at slower surface speeds.

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The video below is not only a good example of how one would want to use a Trochoidal Milling tool path it also illustrates the reason why and when you would use a Trochoidal Tool path. I have searched the web high and low to find a good definition of Trochoidal Milling, but alas I have not been able to find one the hits all the key elements. There are several tool path options, circular, pill or football shaped, "D" shaped and more. Most CAM software now come with tool path choices. But there is more to Trochoidal Milling than just the tool path.

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Can you please suggest this cutting strategy for aluminium material like face milling ,ID milling and also grove milling.

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During the recruitment period, in addition to the salary stipulated by the state, the candidate enjoys the post allowance of CNY 120-150 thousand per year, scientific research starting fund of around CNY 1 million (to be specified upon negotiation), a setting-in subsidy of CNY 0.6 million. All these allowances are subject to negotiation.

(1) The applicant should hold a doctoral degree and an assistant professorship (or an equivalent position)/ research fellowship in a prominent overseas university (or research institute).

The cutting edge is 1200-1400 degrees Fahrenheit when in the cut. When you use coolant the extreme and rapid temperature changes is called thermal cycling. The thermal cycling from hot to cold causes the tool to rapidly expand and contract which results in what we call thermal cracks. As the cracks grow and propagate through the tool you end up with catastrophic failure. So how do you evacuate the chips? Use compressed air.

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The University has set up distinguished professor posts. The candidate is required to hold a doctoral degree, be under 45 years old, have innovative ideas for the discipline construction and academic research, and have the capability to lead the discipline to reach the advanced level at home and abroad within its frontier area.

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(2) The applicant should have been a top talent among peers and shown a strong potential to be a future leader in their area.

A Trochoidal Milling tool path is one that utilizes a light radial width of cut usually in the range of (7 to 15%) of the tools diameter and a long length of cut usually greater than two-times the diameter. The light radial width of cut reduces radial forces and when coupled with a 45 degree or greater helix or cutting edge angle allows for the greater axial length of cut and good chip evacuation. In addition to reduced radial forces, the light radial engagement of the tool thins the chip.

The University has set up the youth distinguished professor posts. The candidate is required to hold a doctoral degree, be under 35 years old, teach core courses, supervise students pursuing master's and doctoral degrees, actively host provincial major scientific research projects, and obtain significant achievements in this field.

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IMPORTANT NOTE: There are many cases where coolant must be used; when machining superalloys or refractory metals, aluminum, some brasses and bronze materials. In cast iron, it's not required; however, it is sometimes used to keep the dust down. Use judgement; just remember coolant in milling requires cutting tool materials with higher cobalt content which requires slowing cutting speeds.

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This chip thinning action requires a significant increase in feed rate in order to create a chip thickness large enough to carry the heat away for the shear zone. This increased feed rate equals high metal removal rates and increased productivity. Another positive result of the light radial engagement and high feed rate is a reduction of heat transfer into the component being machined. This results in less thermal expansion of the part and more accurate size and tolerance control.

As you view the video you may ask yourself why there is no coolant. In reality coolant in milling operations in many but not all cases is a bad thing more than a good thing. What happens when you pour hot water onto a cold windshield? You buy a new windshield. Why? Because the rapid thermal transition from hot to cold causes the windshield to crack. The same thing happens in milling.

The post allowance for Youth Distinguished Professor of Jiangsu University is CNY 90 000 annually. The scientific research starting fund is around CNY 100 000 (to be specified upon negotiation). The setting-in allowance is CNY300 000-350 000.