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以往,热态变薄拉伸(以下简称拉伸)压机的吨位,是按冲孔挤压压机吨位的一半来选定的。为了获得较高的生产效率,应有适当高的拉伸速度,这就使得拉伸过程中所需压机的功率也必须相应增大。限于国内液压元件的性能和供电条件,用作拉伸压机的直接传动高速油压机传动功率就不能太大。作者认为,通过合理选择拉伸压机所需的吨位,可以减少压机所需的传动功率。一、热态变薄拉伸力的计算咬入第i道模圈时,所需的拉伸力为 P_i=f(ε_d、σ_s,α,μ,……) (见图1)式中ε_d——拉伸比,连续拉伸时取ε_d≤1.6～1.7,
In the past, the tonnage of hot thinning (hereinafter referred to as drawing) presses was selected at half the weight of a punching extruder. In order to obtain higher production efficiency, there should be a suitable high tensile speed, which makes the drawing process the required power of the press must also be increased accordingly. Limited to the performance of domestic hydraulic components and power supply conditions, as a direct transmission of the drawing press high-speed hydraulic drive power can not be too large. The author believes that by reasonably choosing the tonnage needed to stretch the press, the drive power needed for the press can be reduced. First, the calculation of hot thinning tensile force bite into the i -th circle, the required tensile force P_i = f (ε_d, σ_s, α, μ, ...) (see Figure 1) where ε_d - Stretching ratio, continuous drawing take ε_d ≤ 1.6 ~ 1.7,