推荐回答(4个)
螺纹底孔D钻=D-P。D螺纹大径,P螺距。
底孔深度H钻=h有效+0.7D。h有效螺纹有效深度,D螺纹大径。
确定目的:主要是在不通孔时用丝锥攻螺纹时丝锥切削部分有锥角,端部不能切出完整的牙型,所以钻孔深度要大于螺纹的有效深度。
任何平面都不可能完全紧密接触,需防漏密封,传统方法是用橡胶、石棉、金属等垫片,但因老化或腐蚀很快就会泄漏。而以厌氧胶来代替固体垫片,固化后可实现紧密接触,使密封性更耐久。
超级润滑剂主要用于降低金属间接触。作为一种螺纹密封复合物,该产品在外螺纹和内螺纹间形成一个接触面,可以保护接头免受摩擦和磨损影响,同时可以承受1407公斤/厘米2的压力,甚至是磨损,腐蚀或错误机加工的螺纹面。
扩展资料
螺纹按其截面形状(牙型)分为三角形螺纹、矩形螺纹、梯形螺纹和锯齿形螺纹等。
其中三角形螺纹主要用于联接(见螺纹乎橘联接),矩形、梯形和锯齿形螺岁孝团纹主要用于传动。螺纹分布在母体外表面的叫外螺纹,在母体内表面的叫内螺纹。在圆柱母体上形成的螺纹叫圆柱螺纹,在圆锥母体上形成的螺纹叫圆锥螺纹。
螺纹按螺旋线方向分为左旋的和右旋的两种,一般用右旋螺纹。螺纹可分为单线的和多线的,联接用的多为单线;用于传动时要求进升快或效率高,采用双线或多线,但一般不超过4线。
三角形螺纹主要用于联接,矩形、梯形和锯齿形螺纹主要用于传动;按螺旋线方向分为左旋螺纹和右旋螺纹,一般用右旋螺纹;按螺旋线的数量分为单线螺纹、双线螺纹及多线螺纹;联接用的多为单线,传动用的慎戚采用双线或多线。
圆柱螺纹中,三角形螺纹自锁性能好。它分粗牙和细牙两种﹐一般联接多用粗牙螺纹。细牙的螺距小,升角小,自锁性能更好,常用于细小零件薄壁管中,有振动或变载荷的联接以及微调装置等。管螺纹用于管件紧密联接。
参考资料来源:百度百科-螺纹
您好!
计算公此段式码扒请森模誉参照附图:
这些都是有相应庆梁标准可以查询的,机械誉野运设计手册中可以查得相关数据.
螺距已经被标准化了.一般相应规格的螺纹,都有粗牙和细牙所对应的螺距.
H=P*根号3/2
P是螺距,H是牙型角原始三角形的高度,其实由等边三角形也能算出来.标准螺牙都是60度的,在三角形的上部去掉H/8,下部去掉H/4,就构成了当前的螺纹的基本牙型.
手边有手册的话,就很容易看懂脊历了.
你说的是普通
公制螺纹
吗?普通公制螺纹的牙型角是60°
计算公式如下:
螺
距游升
P
原始三角形高度
H=0.866P
牙高(工作高度)
H=0.5413P
内
螺
纹
大
径
D--内螺纹
公称直径
外
螺
纹
大
径
d--外螺纹公称直闹磨陪径
内
螺
纹
中
径
D=D-0.6495P
外
螺
纹液蠢
中
径
d=d-0.6495P
内
螺
纹
小
径
D=D-1.0825P
外
螺
纹
小
径
d=d-1.0825P
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