由于拉刀本身的进给作用,因此,拉削是一种特别快速而有效的加工方法。拉刀具有三段不同刀齿(照片见原文),在立式拉床滑座的一次向下行程内,分别起到了粗加工、半精加工和精加工的作用.然而,因为拉刀最大的切削深度基本上由拉刀长度所确定,所以在生产中就使拉削方法在实用上具有一定的局限性(除非有特别长的拉刀和大型拉床,才能进行很深的切削).对于外拉削工序来说,如拉平面和拉槽,据称,TyMiles 公司在他们标准设备上采用多次行程“啄食(Peckering)”法克服了拉刀拉削浅薄的局限性,这种方法实际上起到了附加的进刀作用.加工时仅用拉刀的粗切和半精切两段刀齿,经多次快速、短行程的拉削即达到了所要求的加工深度,然后用一次精加工行程来完成切削。此外,机床具有简易的程控性能(用拨盘控制),其工序完全是自动的.据Miles 报导,程控“啄食”法是一种全新的拉削概念.照片所示为具有代表性的使用情况:在1144钢锻造的油泵转子体周围拉削1(?)(深)×1(?)(长)的槽(插油泵阀用)。为了便于观察,图中所示的零件位于夹具退回的位置上.每个槽宽为 Broaching is a particularly fast and efficient machining method because of the feed function of the broach itself. Broach has three sections of different teeth (photo, see text), in the vertical broaching slide a downward stroke, respectively, played the role of roughing, semi-finishing and finishing.However, because broaches the largest cutting The depth is essentially determined by the length of the broach, so there is some practical practicality in broaching (unless there is a particularly long broach or a large broach in order to make deep cuts). For broaching operations, such as drawing planes and troughs, TyMiles reportedly used a multi-trip “peckering” method on their standard equipment to overcome the shallow broaching limitations of broaches, a practice that actually Play an additional role in the feed processing only roughing and semi-precision cutting two knife teeth, after many fast, short stroke broaching that reached the required depth of processing, and then use a fine Machining itinerary to finish cutting. In addition, the machine has a simple program-controlled performance (with dial control), the process is completely automatic.According to Miles reported, program-controlled “pecking” method is a new concept of broaching.Photograph shows the use of a representative Case: 1 (?) (Deep) x 1 (?) (Long) groove (for plug-in pump valve) is drawn around 1144 steel forged pump rotor body. For ease of observation, the parts shown in the figure are located in the retracted position of the clamps. Each slot width is