出于键槽拉刀刀齿的磨损,往往使拉出的工件槽宽变窄,致使拉刀不能再使用。为此,我们将拉刀最后一个容屑槽磨成矩形槽,并镶入一块硬质合金挤压块(图1),挤压块尺寸如图2所示。通过挤压,使键宽达到图纸尺寸,拉刀可继续使用,又可降低键侧粗糙度至 R0.2,也使工件键侧表面硬化,延长了工 The wear of the broach teeth of the keyway broach often narrows the width of the workpiece that is pulled out, rendering the broach no longer usable. To do this, we ground the last flute of the broach into a rectangular groove and embedded a piece of cemented carbide (Figure 1). The dimensions of the extruded piece are shown in Figure 2. Through the extrusion, so that the key width of the drawing size, broach can continue to use, but also reduce the key side of the roughness to R0.2, but also the workpiece side surface hardening, extended labor