數(shù)控機(jī)床外文翻譯-數(shù)控設(shè)計(jì)(已修改)
2025-06-01 01:22 本頁(yè)面
【正文】 本科生畢業(yè)設(shè)計(jì)（論文） 外文翻譯 外文題目： Numerically Controlled (NC) Machines 譯文題目： 數(shù)控機(jī)床 學(xué) 生 姓 名： 張 龍 專 業(yè)： 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 指導(dǎo)教師姓名： 張 凱 評(píng) 閱 日 期： Numerically Controlled (NC) Machines With automatics, programming is expensive and can be justified only for long production runs. However, with machines incorporating feedback control, programs can be provided in the form of punched tapes or punched cards, which are relatively inexpensive to produce pared with disc and drum cams. These machines are known as numerically controlled (NC) machines and can be used economically in smallbatch production. As the name implies, numerical control involves control on the basis of numerical information that specifies the relative position of the tool and workpiece. From the block diagram for a machinetool control system in Fig. 12 it can be seen that two essential elements are added to an otherwise standard machine. The first added element is a means of driving the machine table or toolholder by a servomotor, and hence the motion of the tool or workpiece depends on the signal passed to the servomotor. The second added ele
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