Lesson 36 Drilling Operations
• Terminology • Text tour
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《机械工程专业英语教程》
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Terminology
• Twist drill • A drill having deep helical grooves along the shank from the point • 麻花钻：从顶端开始沿着钻杆有较深的螺旋槽的钻头
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Text tour
Drilling involves producing through or blind holes in a workpiece by forcing a tool, which rotates around its axis, against the workpiece.[1]
图36.5 摇臂钻床
1—立柱 2—主轴箱 3—摇臂
4—主轴 5—工作台
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Drill with carbide inserts
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Reaming
《机械工程专业英语教程》
Taps 10
Boring
3. machining accuracy 意为“机械加工精度”。全句可译 为；
这种类型的钻头可以有三到四个容屑槽和相同数量的刃 带，它们可以保证良好的导向性，因此具有较高的机械 加工精度。
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《机械工程专业英re employed for enlarging previously made holes and not for originating holes.[4]
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The feed is manually generated by lowering a feed lever, which is designed to lower (or raise) the spindle.[6]
2. To hold or compress in or as if in a vise 钳住，夹紧
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《机械工程专业英语教程》
Upright Drilling Machine
Electric Hand Drill
《机械工程专业英语教程》 7
• Radial drill 摇臂钻床
2. tapered socket of the spindle 意为“主轴锥孔”。全句可译为； 对于后一种情况，钻柄通过斜楔作用与主轴的锥孔相配合并使 钻柄上的扁尾进入到主轴锥孔的槽内，作为传递转动的一个实 体工具。
Tapered shank twist drill
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《机械工程专业英语教程》
• Trepanning drill 套料钻，环孔钻
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Feed Feed is defined as the relative movement per revolution, per tooth or per stroke of the cutting tool in a direction usually normal to the cutting speed direction. 进给量被定义为刀具每转、每齿或每行程通常在与切削速度 垂直的方向上的相对运动量。
《机械工程专业英语教程》
Vise 也作 vice
1. A clamping device of metal, usually consisting of two jaws closed or opened by a screw and lever, used in metalworking to hold a piece in position. 虎钳：由金属制成的钳夹工具，通常有两个钳口，利用 螺杆和手柄使两钳口作相对移动来夹持工件的工具。
• 全句可译为； • 扩孔钻用于对原有孔的扩大，而不能在实体材料上加
工出孔。
This is contrary to the drilling operation on a lathe, where the workpiece is held in and rotates with the chuck.[5] 5. drilling operation 意为“钻孔加工，钻削加工 ”。全句 可译为： 这与在车床上进行的钻孔加工正好相反，在车床上， 工件被夹紧在卡盘内并随其转动。
This type of drill may have either three or four flutes and an equal number of margins, which ensure superior guidance,
thus resulting in high machining accuracy.[3]
Drilling machine 钻床
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《机械工程专业英语教程》
Bench-type drilling machine
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Counterboring, Countersinking, Spot facing 锪沉头孔，锪锥孔，锪孔口平面
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1. through or blind holes 意为“通孔或盲孔”。全句可译为： 钻孔是将一个绕本身轴线转动的刀具压到一个工件上加工出 通孔或盲孔。
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In the latter case, the shank is fitted by the wedge action into the tapered socket of the spindle and has a tang, which goes into a slot in the spindle socket, thus acting as a solid means for transmitting rotation.[2]