An Analytical Approach to Cutter Edge Temperature Prediction in Milling and Its Application to Trochoidal Milling

Cutter edge temperature in milling is an important factor to cutter life. With high cutting speed and feedrate, the cutting efficiency is high; however, the cutter edge temperature is high, shortening the cutter life. Therefore, it is necessary to know the cutter edge temperature in milling. Unfortunately, the cutter edge temperature is difficult to measure and predict in milling. To address the technical challenge, an analytical approach was proposed to predict cutter edge temperature in milling. First, the heat flux into the cutter edge was calculated. Second, by using the Green function, the cutter edge temperature was figured out, and the results obtained from this approach agreed well with that of a recognized test. Then, based on the engagement between the cutter and workpiece in trochoidal milling, the cutter edge temperature was obtained in trochoidal milling. Finally, a temperature comparison was made between trochoidal and side milling based on this analytical approach, and the reasons that trochoidal machining could extend the cutter life were found. This approach is first proposed to calculate the cutter edge temperature in trochoidal milling and can be applied to machining parameters optimization in trochoidal milling and cutter design optimization

Determinants and performance effects of management consultancy adoption in listed Chinese companies

As China seriously lacks trained and experienced personnel at its current stage of development, management consultancy may be adopted as an economical solution to improve efficiency and performance. However, as institutional theory suggests, it is likely that the adoption of management consultancy in China is driven more by mimetic isomorphism factors than by actual performance considerations. Using data from a survey of 219 listed Chinese firms, our results suggest that there are significant positive effects from mimetic isomorphism factors and adoption of management accounting and controls and information and communication technology. Our study provides strong evidence that the adoption of management consultancy has a positive effect on firm performance, yet we cannot conclude that management consultancy is adopted to improve firm performance. Moreover, state ownership held by state-owned enterprises (SOEs) has a significant and positive effect on management consultancy adoption, whereas state ownership held by government agencies does not. One interpretation is that firms controlled by SOEs have acquired increased autonomy and become more innovative