No abstract

To solve the problems of installed trival, resource waste, hammerhead falling off and improve the poor abrasion resistance of hammer handle under the crusher hammers working condition, the new combined type crusher hammers were designed by connecting separated hammer handle and separated hammer head. When hammer head were worn badly, we just replaced hammer head and don't have to remove the shaft rod. This design can save a lot of time and labor force, improve production efficiency and we can save a lot of resources by reusing the hammer handle; At the same time, hammer tip was casted with liquid-liquid bimetal composite casting technology of casting, under the premise of guaranteeing the wear-resisting, which can also ensure that the impact toughness of the joint. Validated by actual working condition, hammer handle can be replaced at least five times for this design of hammer, and each group has 24 hammer heads, every 5 sets of hammer heads can save 1200 kg metallic materials, 1800 KWh and CO2 emissions dropped by 1795 kg.

Main low-PIM crafts were summarized, such as material requirements of major devices and special requirements of electroplating process. The setting up technologies of a PIMI testing system was discussed, for example reducing the number of connectors, isolators being used to prevent active IM and requirements of subsystem and receiver being given. Based on those crafts and technologies, a PIMI testing system was setting up with a design goal of 3rd residual PIM being-165dBc@2x43dBm. It achieved the goal with-165dBc through actual measuring after calibration.

The three-dimensional models of the Working-roll of Carder are founded by three-dimensional design software Solidworks and the working process of Working-rolls is simulated by finite element analysis software Cosmos, which obtain overall stress distribution for the Working-roll of Carder. The relations between the working-rolls with different thickness and different length of work roll axis and the stress, strain and radial displacement in the working process of working-rolls are attained by finite element analysis and the important factors of impact of work roll deformation are indicated by analog simulation. The results show that the maximum stress and maximum strain are occur in the place of roller connected with the axis rather than to appear in the middle part of roller and the radial displacement in the working process of working-rolls and the length of work roll axis are not directly relationship. The Finite element analysis results provide an important theoretical basis to design a reasonable the length of axis and the thickness of roller for the working-roll of carder.

Cutting temperature is the main factor to be considered in the select of coated cutting tools, so the study on the temperature of coated cutting tools is of practical significance. Diffusion layer of coated cutting tools has important implications on cutting heat generation and temperature distribution. In this paper, thickness of diffusion layer is determined by making use of spectrum analysis method to observe elements diffusion between coating and substrate of coated cutting tools. By dividing the diffusion layer into two parts on both sides of interface of coating and substrate, diffusion layer model is established. By integrated use of calculation method of Maxwll-Eucken model, Series model and equivalent thermal conductivity of multi-layer materials, thermal conductivity calculation formula of diffusion layer is derived. Method of thermal conductivity calculation when combining coating and diffusion layer into a whole layer is also put forward. Results of this paper have wide significance for experiment and simulation study on coated cutting tool temperature.