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在机械加工过程中,经常会碰到一些精度要求高而细长的轴,其长径比超过100。这类轴在加工时刚性很差,往往由于轴本身的自重就会产生挠度(弯曲),从而在旋转过程中产生振动,给切削加工带来困难。如按通常的加工方法,零件根本无法满足原设计的精度要求。为此,我们根据拉杆比压杆稳定的特点,设计了一种拉力弹性顶尖,以满足加工高精度细长轴的需要。 1.结构此拉力弹性顶尖是由联接套、挡圈、顶尖、保持架、弹簧、拉杆、顶尖体、端面轴承、蝶形弹簧、垫圈、螺母、钢球、轴承外圈等所组成(见图1)。 2.工作原理首先将顶尖体7用螺钉与车床尾座轴联接,联接套1与工件的工艺螺纹相联,顶尖3在弹簧5的作用下顶住工件的中心孔,实现定位。然后转动车床尾座
In the machining process, often meet some high precision and elongated shaft, the aspect ratio of more than 100. Such shafts are poorly machined, often deflecting (bending) due to the shaft’s own weight, creating vibrations during rotation that create difficulties in cutting. Such as the usual processing methods, the parts simply can not meet the original design accuracy requirements. To this end, we designed a tension elastic tip according to the stability of the tie rod to meet the needs of processing high-precision slender shafts. 1. Structure This tension elastic top is composed of coupling sleeve, retaining ring, top, cage, spring, rod, top body, end bearing, butterfly spring, washer, nut, steel ball, bearing outer ring 1). 2. Working principle First, the top body 7 is screwed to the lathe tailstock shaft. The coupling sleeve 1 is connected with the process thread of the workpiece, and the top 3 is positioned against the central hole of the workpiece under the action of the spring 5. Then turn the lathe tailstock