随着我国航空工业的发展,拉杆热收口机的应用日益广泛,各飞机工厂都有需求。为适应各厂拉杆规格的具体情况和促进今后热收口机按加工范围分级系列化工作,本文愿作为本刊一九八四年第十期章以焕同志的《拉杆热收口机设计》一文的补充,不知妥当否,供参考。1.主缸最大推力的确定拉杆规格很多,仅我厂就有Φ12～Φ70毫米60多种规格。不同截面尺寸的拉杆所需的主缸推力不同,其计算公式为:式中符号D。、S。、d、α如图1所示;σ——不同温度下的应力(见图2);σ。——断面未收缩时的应力(初始应力);μ——不同温度下的摩擦系数(见图3);Π——应变刚模数Π=tgβ(见图2)。如果所设计的推力P小于拉杆收口所需要的推力,机床无法使用;若超过所需推力太 With the development of China’s aviation industry, the application of the rod-type heat-bibcock machine is becoming more and more widespread, and all the aircraft factories have their own needs. In order to adapt to the specific circumstances of each rod rod specifications and to promote the future heat-mouth machine according to the processing range grading serialization work, this article is willing to serve as the tenth chapter of 1984 Zhang Huan comrades “rod bibcock design” article Supplementary, I do not know properly for reference. 1. Master cylinder to determine the maximum thrust rod size many, only my factory there Φ12 ~ Φ70 mm 60 kinds of specifications. Different cross-sectional dimensions of the main cylinder thrust rod required for different, its formula is: Symbol D in the formula. S , D, α as shown in Figure 1; σ - stress at different temperatures (see Figure 2); σ. - The stress (initial stress) when the cross section is not contracted; μ - The friction coefficient at different temperatures (see Figure 3); Π - The modulus of strain Π = tgβ (see Figure 2). If the designed thrust P is less than the thrust required for the tie rod retraction, the machine can not be used; if the required thrust is too