数控技术应用专业英语(第三版)配套资源习题参考答案

学习情境一

任务1习题参考答案EXERCISE 1

Fill in the blank according to the text.

te

2.turning drilling

3.main feed

rge diameter disc –type

5.headstock guide way tailstock

6.the hydraulic cylinder the chuck

7.the turret fast-moving cutting fluid switch EXERCISE 2

Match A with B.

EXERCISE 3

Choose the best answer.

1.c

2. a

3. c

4. b

5.a

EXERCISE 4

Answer the following questions briefly according to the text.

1.The program is changed.

2. a longer axial dimension or a small disk type workpieces

3.construction casting molded with resin

4. the hydraulic system pressure

5. by graphics and text symbols which represent the connection between electrical components and electrical works in the circuits.

任务2习题参考答案

EXERCISE 1

Write the English name of each tool on the corresponding number.

1.center drill

2. external turning tool

3. twist drill

4. thread tool

EXERCISE 2

Match A with B.

EXERCISE 3

Fill in the blank according to the text.

1. dimensional

2. perpendicularity

3. quenching

4. taper

5. High-speed steel（HSS）

6. function adequately

7. Cemented carbides

8. negative

EXERCISE 4

Answer the following questions briefly according to the text.

1.The symbol means symmetry.

2. Positive rake angle reduces the cutting forces resulting in smaller deflections of the workpiece, tool holder and machine.

3. Depth of cut is defined as the distance that the cutting tools is plunged into the workpiece.

4. It is generally recommended to use higher feed rate for roughing operations.

5. The cutting speed is dependant primarily upon the material being machined as well as the material of the cutting tool .There are also other variables that affect the optimal value of the cutting speed. These include the tool geometry, the type of lubricant and coolant, the feed and the depth of cut etc.

6. If the depth of cut is too large, the insert may be overloaded, causing immediate breakage.

7. Center drill and twist drill are required in drilling operation.

EXERCISE 5

Make calculation using the formula in the text.

1. n=1000V/πD= 1000×157/50π =1000 r/min

2. a p =(d w-d m)/2=(50-46)/2=2mm

EXERCISE 6

Write down the symbols and Chinese meaning according to the description of the geometry tolerance.

任务3 习题参考答案

EXERCISE 1

Match A with B.

EXERCISE 2

Answer the following questions briefly according to the text.

1. It usually starts with “o” or “%”.

2. The programmer.

3. M02 or M30.

4. If the programmer makes a mistake in incremental program, every incremental movement from that point will be incorrect.

5. The manufacturer.

6. The preparatory codes or words are called G codes.

7. Coordinates from the program zero point is called absolute mode of programming.

EXERCISE 3

Mark the following statements with T（true）or F（false）.

1.T

2.F

3.T

4.F

5.F

6.F

7.T

8.F

EXERCISE 4

Fill in the blanks according to the text.

1. miscellaneous

2. X and Z axes

3. distance

4. a new value is specified