数控英文课件Unit 6 CNC Machining Process

Process sheets, also called routing sheets, are used by most manufacturing companies to specify the sequence of machining operations to be performed on a work-piece during the manufacturing process. Table 6-1 is an example sequence of i Roughing半粗加工
This stage of machining generally uses a smaller cutter than roughing, typically an end mill, although the aim is still to remove the bulk of the waste material.
编制工艺时，应考虑程控加工中每个刀具的切 削条件，这一点很重要；这些切削条件涉及主轴、 进给率、切削深度、冷却、刀具材料以及工件材料 等。
The example of material removal below demonstrates in details the procedure for machining a curved surface component, in this case a wing section.
Besides, you have to do with the tooling used by program. Tooling problems can cause even a perfectly coded program to fail. Pay attention to the types of cutter used. It is important to know the functions of various cutters during developing machining process.
这一阶段使用的刀具比粗加工要小，一般 使用端铣刀，尽管加工目的仍然是切除大量 冗料。
Semi Finishing半精加工
The next stage, using a relatively large ball nosed cutter, is to start to form the final profile of the work-piece. 下一步的目标是用比较大的球头铣刀开始形成零件的最终轮 廓。 Finishing精加工
下面举例详细说明加工曲面零件（机翼部 分）时切削材料的过程。
Roughing粗加工
This is the first stage of machining where the object is to quickly remove the bulk of the waste material, normally with the aid of a ripper cutter.
这是加工的第一阶段，其目的是快速切掉大量冗 余材料，通常用纵切刀完成。
句中，where the object is to quickly remove the bulk of the waste material是定语从句，修饰the first stage of machining；其中的waste material可引申为“冗 余材料”。
The final stage, and the longest process of all, is the final cut to the desired size. A small ball nosed cutter traversing across the surface produces the finished shape. 精加工是最后一个阶段，也是所有加工中最长的阶段，它的 任务是把零件加工到期望的尺寸精度。精加工采用小型球头 铣刀在工件表面移动，从而加工出精美形状。
绝大多数制造公司使用工艺单（也叫流程 单）来说明零件加工过程所用加工操作的顺 序。表6-1所示是一个典型的工艺单。
While developing a machining process, it is important to consider the cutting conditions you will use with each tool in the program. These cutting conditions involve functions like spindle, feed rate, depth of cut, coolant, tool material and work-piece material.
The better prepared the programmer, the easier and more successful the programming task will be. 这是一个比较句，意思是“程序员把加工工序准备得越好，编 制程序就越轻松、顺畅。
So a good programmer must be a good process planner first. 因此，好的程序员首先必须是一位好工艺师。
As we all know, determining the sequence of individual manufacturing operations needed to produce a given part or product is very important before CNC machining. It is directly related to the success of the program. 众所周知，在CNC加工前确定加工工件或产品所需要的工序是 非常重要的，因为它直接关系到程序能否顺利运行。
Although this is the final machining stage there is still much work to do in the form of hand polishing and finishing before the article is complete. 虽然这是最后的加工阶段，但在加工出完整的零件之前仍然 有很多手工抛光的精加工工作要做。