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在航空产品中,常常会遇到安装座、壳体、管接嘴等零件.这类零件接嘴端长度尺寸L(见图)为空间尺寸.在生产中,若用通用量具或用按照阿贝设计的专用量具测量,很不准确.这是因为:1.零件上两孔中心线交点“O”常因“R”(球)转接不好,O点的空间位置无法确定.2.高度尺寸“H”的公差±δ_1反应在L方向上的误差为δ=±δ_1sinα,误差是比较大的.为此,我们采用了一种简易专用测具来测量空间长度尺寸,测量精度较高.测具主要由支承板1、定位销2、支承座3、测量体4、限位螺钉5、测量杆6、半球形转接测量头7等部分组成(见图).这个测具的主要特点是采用了半球形转接测量头.在测量中,测量头能保持测具的
In aviation products, often encounter parts such as mounts, housings, pipe nipples, etc. Such parts nozzle length L (see photo) for the space size in the production, if the use of general-purpose measuring instrument or according to A This is because: 1. Part of the hole on the center line intersection “O” often due to “R” (ball) transfer is not good, O point of the spatial location can not be determined .2. The error of δ ± δ_1 in the L direction is δ = ± δ_1sinα, and the error is relatively large.Therefore, we use a simple and special tool to measure the length of the space, the measurement accuracy is high The measuring tool is mainly composed of support plate 1, positioning pin 2, supporting seat 3, measuring body 4, limiting screw 5, measuring rod 6, hemispherical adapter head 7, etc. (See the figure.) The main The feature is the use of a hemispherical adapter probe. In the measurement, the probe can maintain the test