Green manufacturing is a new model to solve current environmental problems in manufacturing, and the process route determination of the product machining process is one of the key problems. According to the existing machining process and equipment of mine fans impellers, analytic hierarchy process (AHP) is used to assist in building the optimized decision-making model and multi-criteria assessment indicator system and help draw decision. It is concluded that processing technology route of using steel plate stamped is better than that of using aluminum ingot cast for mine fan impellers. The decision coincides with fan impellers actual production.

The product smaller-the-better (STB) quality characteristics are continually changing and out of specification limits because of the constant stress, wear and others after the product is put into use, which will cause loss because of the product rejected and scrapped. On the basis of the quality viewpoint that product quality loss is present worth of a loss caused as a result of its quality characteristics because its quality characteristic is out of specification and lead to product scrap after the product is put into service, the paper establishes the present worth model of quality loss of STB characteristic based on service life distribution, and proposes the calculation method on the probability density function (PDF) of the product service life based on the technical specifications of STB quality characteristic. It takes the concentricity between the inner cylindrical surface and the outer cylindrical surface of the link bushing as an example to analysis the various factors that impact on the present worth of concentricity quality loss in the new model, and contrast with Taguchi quality loss model. The results show that the new model describes an actual loss that a product imparts to society after the product is put into service, and can reflect the quality loss of STB characteristic in the product service process, and is more realistic than Taguchi quality loss model of STB. The new model extends tolerance design of STB characteristic from the manufacturing stage to the service stage.

Characteristics impedance is a very important physics parameter for many applications in rock fragmenting and percussive drilling. When the shape of the elastic bar is very complicate, it is difficult to calculate the characteristics impedance of the elastic bar with its definition. A method which uses the incident wave and reflected wave to calculate the characteristics impedance of elastic rods is presented. Firstly, the relationship of the incident wave, reflected wave and the characteristics impedance of elastic rods is studied on the basis of the reflection and transmission laws of elastic waves and, the resolution model is established; Then impact experiments were carried out in which a drilling bit with step cross-section was designed. The signal processing of eliminating polynomial trend item and discrete wavelet de-noising were done to stress signals before calculation to decrease the error. It is proved that the method is adequately accurate from the testing results.

Titanium Carbonitride (TiCN) based cermets are important cutting tools materials. Fabrication of the material is time and cost consuming process for the traditional sintering. In this paper, TiCN based cermets were prepared by using microwave sintering and spark plasma sintering compare to traditional sintering, and the microstructures and properties were investigated. The results show that microwave sintering and the spark plasma sintering can obtain similar properties with traditional sintering with shorter sintering time, this will greatly save energy. The strength and hardness of TiCN based cermets sintered by microwave sintering is 1136Mpa and HRA87, respectively. Microwave wave sintering can obtain finer grain than traditional sintering, and spark plasma sintering have the finest grain, which is in the range of 0.3μm~0.5μm. Due to the present of big pores, the bulk of spark plasma sintering has the lowest bending strength.