In this paper, the compression test on the bulk nanocrystalline sliver ( n Ag) with average grain size of 50 nm was made. The stress-strain curves under different strain rates were obtained by test. The test results show that the mechanical behavior of n Ag is rate-dependent, and the dynamic compress yield stress are about 1.5 times of that n Ag in static test condition; The effect of strain harding on n Ag is smaller than that of coarse-grained silver (c Ag) in plastic deformation; The relationship between the yield strength and the logarithm of strain rate is approximately linear.
This paper adopts the method of PRO/E programs, relationships and parameters to conduct the parametric design process for various types of spur gears, analyzes the key parameters of the spur gears, defines them via programming, and by the use of parameters dialog box and relationships dialog box to define basic parameters and the relationships between them step by step, finally to complete the gear’s parametric model.
In this paper, the analysis and method of forming for cold extrusion die of precision gears is analyzed. The basic principle and progress of gear closed forming based on exchanging axles on the common hydraulic press are introduced. The mould structure is introduced.
This paper puts forward the top-down design of parts and products by using PRO/E-Based master part. This method can accord with requirements of customers in time, change the traditional working mode, thus, improving the design efficiency.
The working principle of the adjustment device of the weaving density for the knitting machine is briefly introduced. Compared to the limitation from the adjustment device of the hand-cranked knitting machine, this paper presents another design method that the device is automatically controlled by the stepping motor to change the weaving density.
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