SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Selection of machining equipment and tooling for operations Determination of operating procedure for each operation k Determination of operational dimensions and tolerances for machining operations k Selection of machining conditions and determination of time Standards Of each operation Composition of Machining processes A machining process is made up of a number of operations through which raw materials or blanks are transformed into parts The basic components of machining processes are operations An operation is a complete portion of the machining process for cutting, grinding, or otherwise treating, a workpiece (or seyeral workpieces simultaneously)at a single workplace. An operation is accomplished by one or several operators(until they start to repeat the same procedure for the next workpiece or next set of workpieces in the batch) 批[ work piec件
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING ﹡Selection of machining equipment and tooling for operations. ﹡Determination of operating procedure for each operation. ﹡Determination of operational dimensions and tolerances for machining operations. ﹡Selection of machining conditions and determination of time standards of each operation. Composition of Machining Processes A machining process is made up of a number of operations through which raw materials or blanks are transformed into parts. The basic components of machining processes are operations. An operation is a complete portion of the machining process for cutting, grinding, or otherwise treating, a workpiece (or several workpieces simultaneously) at a single workplace. An operation is accomplished by one or several operators (until they start to repeat the same procedure for the next workpiece or next set of workpieces in the batch). 一批 work piece 工件
SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING The operation is characterized by the unchanged equipment, unchanged workpiece and continuity. For example, a batch of workpieces is machined first on a lathe, and then on a milling machine. Obviously, two operations are involved. Fig. 6. 1 shows the machining of the center hole and recess of a recess退刀槽 flange. f a batch of the workpieces areflange法兰盘 machined consecutively by drilling, boring‖bore镗孔 holes and boring recesses with three different cutting tools at the same workplace(e.g.a lathe), it is a single operation. If these holes are drilled on a lathe and then bored on another, the machining of the workpieces will consist of two operations instead of one
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING The operation is characterized by the unchanged equipment, unchanged workpiece, and continuity. For example, a batch of workpieces is machined first on a lathe, and then on a milling machine. Obviously, two operations are involved. Fig. 6.l shows the machining of the center hole and recess of a flange. If a batch of the workpieces are machined consecutively by drilling, boring holes and boring recesses with three different cutting tools at the same workplace (e.g. a lathe),it is a single operation. If these holes are drilled on a lathe and then bored on another, the machining of the workpieces will consist of two operations instead of one. recess 退刀槽 flange 法兰盘 bore 镗孔