机械专业英语翻译成中文(急)软件直接托的不要,要人工的。辛苦大家了 3.1.3 Other Independent Pr
机械专业英语翻译成中文(急)
软件直接托的不要,要人工的。辛苦大家了
3.1.3 Other Independent Process Parameters
These three process variables - reduction, cone angle, and friction - are independent in that the
process planner may exercise a degree of freedom in choosing their values. The severity of
friction, for instance, is controlled, within limits, by choices of lubricant, die material and finish,
speed, etc.
The above three parameters, namely, reduction, cone angle and friction are the primary factors
affecting the process. Their effects on the first dependent parameter, the drawing or extrusion
force, will be analyzed first. Other independent parameters also play a role during processing.
For example, the drawing or extrusion force is linearly proportional to the flow strength of the
material, but when inertia forces are neglected, it is independent of the speed. The power, on the
other hand, is linearly proportional to speed. Furthermore, we will first consider isothermal
processing, where temperature is not a factor and then extend the treatment to handle adiabatic
processing and temperature effects. Thus, at first, only the effect of the three independent
parameters (r%, a, and friction) is considered.
3.1.4 The Dependent Variable
The force required for drawing or extrusion can now be characterized. In Fig. the drawing
force F (or drawing stress Fxf = F front/Af) is obviously a function of reduction (larger reduction
requires higher force), of cone angle, and of friction, and similarly for the extrusion force F (or
extrusion stress Fxb = F back/Ao). In short, the motivation force or stress causing the drawing or
extrusion is a dependent variable which is a function of reduction, cone angle, and friction.
Description of the drawing force, for example, as a function of these three independent variables
may be undertaken by either an experimental approach or an analytical approach. Each approach
can be aided by the other. Both approaches will be reported here and the results will be
compared.