CNC Machine Programming and Operation Test Bank and Answers
I. Fill in the blanks
1, CNC programming can be divided into manual programming and computer-aided programming.
2, CNC lathes can be divided into economic CNC lathes, full-featured CNC lathes, and turning centers.
3. The coordinate dimension word U represents the increment in the X coordinate direction, and W represents the increment in the Z coordinate direction.
4, the main steps of the CNC lathe including pattern analysis stage, process analysis stage, CNC programming stage.
5. The subroutine supports repeated calls and multiple nesting.
6, CNC process analysis mainly includes the selection of machining equipment, determine the process route, the choice of clamping edge auxiliary tools and choose a reasonable amount of cutting.
7, a complete machining program usually has a main program and a number of sub-programs.
8, economic CNC lathes generally use open-loop or semi-closed-loop servo system.
9, CNC lathe generally use mm or ?m as the unit of size.
10, the address word G means ready function word, F means feed function word, S means spindle function word.
Second, judgment questions
1, the use of circular interpolation instruction processing whole circle can be programmed using the R address. (?)
2, when judging the direction of the coordinate axis of the CNC lathe, the direction of the tool away from the workpiece is specified as negative. (?)
3, manual programming has been eliminated due to very low efficiency, and automatic programming is now widely used. (?)
4, the tool arc left compensation instruction code is G43.(?)
5. Subroutines can be nested. (?)
6, the main processing object of CNC lathe is rotary parts. (?)
7, economic CNC lathe tool holder is generally rear-mounted. (?)
8, turning center part of the machine with tool magazine and automatic tool changer. (?)
9, the address word T represents the line number identification, usually followed by four digits. (?)
10, the threaded tool can be set visually when the tool is set. (?)
Three, multiple choice
1, CNC lathe spindle axis direction for (B)
A X axis B Z axis C Y axis
2, full-featured CNC lathe using tilting guideway is mainly for the purpose of (B)
A to improve the machine rigidity B convenient for the chip removal C easy to clamping workpiece
3, the following CNC lathe using tilting rail is mainly for (B)
A improve machine rigidity B convenient for the chip removal C convenient for the workpiece
3, the following address word, (C) does not represent the coordinate size word
A.W B.R C.F
4, the following instructions, (B) does not represent the end of the program.
A.M02 B.M98 C.M30
5. The (B) instruction is used for left compensation of the tool tip arc radius.
A.G40 B.G41 C.G42
6, to the origin of the machine tool for the coordinate origin of the coordinate system is called (A)
A machine coordinate system B programming coordinate system C incremental coordinate system
7, the programming origin of the principle of choice does not include (C)
A selected in the position of the change in the check B selected to facilitate the calculation of the position of the C can not be Selected in the design reference
8, 90?cylindrical turning tool '(B) that is the main cutting edge and the intersection of the sub-cutting edge.
A Tip point B Bit point C Tool setting point
9, manual tool setting can determine the origin of (A).
A Programming coordinate system B Incremental coordinate system C Workpiece coordinate system
10, the main difference between the main program and the subroutine is that the end line (C) is different.
A Dimensions B Coordinates C ? Word ?
Fourth, the terminology
1. tool point:
The point where the lathe can be used as a programming and machining reference is called the tool point.
2. machine origin:
The manufacturer in the manufacture of machine tools set a fixed coordinate system origin.
3. Initial state:
Refers to the state of the CNC system after power-on or reset.
V. Short answer questions
1. Programming origin has those selection principles?
A: 1, the selected origin should facilitate mathematical calculations, can simplify the preparation of the program;
2, the origin of programming should be selected in the easy to find the right, easy to check the location of the machining process;
3, the origin of programming should be selected as far as possible in the design of the parts on the benchmark or process benchmarks in order to make the processing of the smallest error.
2, turning center of the three typical features?
A: (1) the use of power tool holder
(2) turning center with C-axis function
(3) large capacity of the tool holder
3, what are the two short principles of manual programming?
A: First, the part machining program should be short,
Second, the part machining route should be short.
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