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在设备修理过程中经常采用扩孔镶套来恢复零件孔的精度。常用的镶套方法有两种:一是用外力将套压入;或是加热包容件将套镶入。但这两种方法对体积大、形状复杂的零件镶套,有时是不适宜的。针对这种情况,我们采用了“冷缩法镶套”,现具体介绍如下。 1.套的结构及材质套的结构如图1所示。φ551_(0.30)~(0.35)为与箱体孔的配合尺寸,其配合选为D/Je(H6/S7)。当箱体孔壁、套壁较薄时,要进行强度校核。φ537D为套孔的最后尺寸,镶入前应留精加工量1～2 mm。为便于套的定位,在套的一端加一凸缘,凸缘上有若干均布通孔,再用螺钉与箱体紧固。套的材质根据情况自选,我们选用了ZQAL9—4。
In the equipment repair process often reaming inserts to restore parts hole accuracy. There are two commonly used methods of setting the sleeve: First, the use of external force into the sleeve; However, these two methods for bulky, complex shape parts set, sometimes not suitable. In view of this situation, we have adopted the “shrinking method set”, are described below. 1 sets of structure and material structure of the package shown in Figure 1. φ551_ (0.30) ~ (0.35) with the box hole with the size, with the election as D / Je (H6 / S7). When the box wall, wall thickness is thin, to check the intensity. φ537D sleeve hole for the final size, should be left in the finishing before finishing the amount of 1 ~ 2 mm. In order to facilitate the positioning of the sleeve, a flange is added on one end of the sleeve, a plurality of uniform through holes are arranged on the flange, and the screws are fastened to the case. Set of materials according to the situation of choice, we use the ZQAL9-4.