1. When milling the following materials with cemented carbide tools, () has the highest cutting speed.

A. Al-Mg alloy B. Alloy steel C. Medium-low carbon steel D. Gray cast iron

2. One of the rotating shafts of CNC machine tools, axis B, is an axis that rotates around a linear axis ().

A) X axis B) Y axis C) Z axis D) W axis

3. The following about the closed-loop control of CNC machine tools is the correct explanation ().

A. In the control of this machine tool, there is no position detection element.

B This kind of CNC machine tool is to install a position detection element at the end of the driving motor or the end of the driving screw to indirectly measure the actual position or displacement of the actuator.

C. This kind of CNC machine tool directly installs the position detection element on the moving parts of the machine tool to directly detect the actual position of the machine tool workbench.

D this kind of CNC machine tools are equipped with angular displacement detection devices to detect the movement of the workbench.

4. The speed before the tool cuts into the workpiece from a safe height is called ().

A. Feed speed B. Approach speed C. Fast forward speed D. Retreat speed

5. According to the control trajectory classification of machine tool movement, the machining center belongs to ().

A) point control b) linear control c) contour control d) remote control

6. When boring high-precision holes, after rough boring, after the cutting heat on the workpiece reaches (), finish boring.

A) thermal balance b) thermal deformation c) thermal expansion d) thermal elongation

7. Generally speaking, increasing the () of the process system can effectively reduce the vibration intensity.

A) stiffness b) strength c) accuracy d) hardness

8. CNC finish milling, generally should choose ().

A. The cutter feed is large, the spindle speed is low and the feed speed is high.

B. The cutter feed is small, the spindle speed is low and the feed speed is high.

C. The cutter feed is small, the spindle speed is high, and the feed speed is fast.

D. The cutter feed is small, the spindle speed is high, and the feed speed is low.

9. High-speed cutting should use () handle.

A)BT40 B)CAT40 C)JT40 D)HSK63A

10. Machine tool fixtures can be classified into general fixtures, special fixtures and combined fixtures according to ().

A) use the power source of machine tool type b) to drive the fixture to work.

C) clamping mode d) degree of specialization

1 1. The long V-shaped frame can position the cylinder, which will limit the freedom of the workpiece.

A) two b) three c) four d) five.

12. The tool radius compensation instruction returns to zero as ().

A) mode maintenance b) temporary erasure c) erasure d) initial state

13. When grinding the shaft sleeve, grind the excircle based on the inner hole first, and then grind the inner hole based on the excircle. The principle followed is ().

A) datum coincidence b) datum unification c) self-datum d) mutual datum.

14. The heat treatment of heating steel to the temperature where phase transformation occurs, keeping the temperature for a certain time, and then slowly cooling to room temperature is called ().

A) annealing b) tempering c) normalizing d) tempering

15. The ball radius of ball-end milling cutter usually () processes the curvature radius of curved surface.

A) less than b) greater than c) equal to D) A, B and C are all acceptable.

16. When testing the straightness of the machine tool guide rail with a level, if the level is placed at the right end of the guide rail; The bubble is 2 squares on the right; If the liquid level gauge is placed at the left end of the guide rail, and the bubbles are 2 squares to the left, the guide rail is in the state of ().

A) convex b) concave c) neither convex nor concave d) twisted.

17. Generally, when making metal tools, the rake angle of cemented carbide tools () the rake angle of high-speed steel tools.

A. greater than b. equal to c. less than d. is possible.

18. The choice of cutting tools mainly depends on the structure of the workpiece, the material of the workpiece, the processing method of the working procedure and ().

A) Equipment b) Machining allowance c) Machining accuracy d) Roughness of machined surface of workpiece

19. In Fanuc system, in program segment G17g16G90x100.0y30.0, the x instruction is ().

A) x-axis coordinate position b) Distance from the polar coordinate origin to the tool center

C) rotation angle d) time parameter

20. In the () of the CNC milling machine, there is an automatic broaching device, which can complete the loading and unloading of tools in a short time, making the tool change more convenient.

A) spindle sleeve b) spindle c) sleeve d) tool holder

2 1. In Fanuc system, in program segment G5 1x0000, the p instruction is ().

A) subroutine number b) scaling ratio c) pause time d) loop parameters

22. CNC machine tools are composed of four basic parts: (), CNC device, servo mechanism and machine tool mechanical part.

A) numerical control program b) numerical control medium c) auxiliary equipment d) programmable controller

23. One or several degrees of freedom of the workpiece are repeatedly restricted by different positioning elements, which is called ().

A) complete positioning b) insufficient positioning c) excessive positioning d) incomplete positioning

24. In the numerical control machine tool, the pulse signal is converted into a part of the machine tool moving parts movement called ().

A) control medium b) numerical control device c) servo system d) machine tool body

25. () is the executive component of hydraulic system.

A) motor b) hydraulic pump c) hydraulic cylinder d) hydraulic control valve

26. in Fanuc system, the r instruction of program segment G68X0Y0R45.0 is ().

A) Radius value b) Turn clockwise by 45? C) Rotate counterclockwise for 45 D) Cycle parameters

27. CNC machine tool accuracy inspection mainly includes geometric accuracy inspection, coordinate accuracy and () accuracy inspection.

A) integrating b) moving c) cutting d) working

28. The automatic measuring system of NC machine tool configuration can measure the coordinate system, position and () of the workpiece.

A) roughness b) dimensional accuracy c) cylindricity d) positioning accuracy of machine tools

29. It is known that the diameter of the milling cutter is φ20 mm, the starting point S coordinate of the arc is (90,50), the ending point coordinate is (-21.962,20), and the radius of the arc is R60. The tool cuts into the arc from the starting point (140,50), and the dotted line is the tool center trajectory. The tool radius compensation number is D0 1. According to the chart, the following correct program segment is ().

A.g90 G00 x 140.0y 50.0 Z-5.0；

g 0 1x 90.0y 50.0 f 100.0；

g03 X-2 1.962y 20.0 I 60.0 J0 d 0 1；

B.g90 G00 x 140.0y 50.0 Z-5.0；

g 0 1 G42 x 90.0y 50.0d 0 1 f 100.0；

g03 X-2 1.962y 20.0 r 70.0；

C.g90 G00 x 140.0y 50.0 Z-5.0；

g 9 1g 0 1 G42 x 90.0y 50.0d 0 1 f 100.0；

g03 X-2 1.962y 20.0 r 60.0；

D.g90 G00 x 140.0y 50.0 Z-5.0；

g 9 1g 0 1 G42 X-50.0 Y0 d 0 1 f 100.0；

g03 X- 1 1 1.962Y-30.0 I-60.0 J0；

30. In Fanuc system, high-speed cutting function: G code of pretreatment control, which is ().

A)G08 B)G09 C)G 10 D)G39

3 1. When milling an arc on the XY plane, the starting point of the arc is (30,0), the end point is (-30,0), the radius is 50, and the rotation direction of the arc from the starting point to the end point is clockwise, so the instruction for milling the arc is ().

a)g 17 G90 G02 X-30.0 Y0 r 50.0 F50

b)g 17 G90 G03 X-300.0 Y0 R-50.0 F50

c)g 17 G90 G02 X-30.0 Y0 R-50.0 F50

d)g 18 G90 G02 x 30.0 Y0 r 50.0 F50

32. Program section G00G01G02G03x50.0Y70.0R30.0F70; Finally, execute the () instruction.

A)G00 B)G0 1 C)G02 D)G03

33.FANUC system, the following () variables belong to public variables.

a)# 30 B)# 140 C)# 2000D)# 520 1

34. Drill a hole with a depth of 10MM at the (50,50) coordinate point, and the zero point of the Z axis coordinate is located on the surface of the part, then the instruction is ().

a)G85 x 50.0y 50.0 Z- 10.0 R0 F50

b)g 8 1x 50.0y 50.0 Z- 10.0 R0 F50

c)g 8 1x 50.0y 50.0 Z- 10.0 r 5.0 F50

d)G83 x 50.0y 50.0 Z- 10.0 r 5.0 F50

35. In the hole system processing as shown in the figure below, the description of the processing route is correct ().

A) Figure A satisfies the principle of shortest processing route; B) Figure B meets the principle of the highest machining accuracy;

C) Figure A is easy to introduce reverse gap error; D) All the above statements are correct.

Comparison of Figure 1 Hole Series Machining Route Schemes

36. Usually, when machining a plane with ball end mill, the quality of surface roughness is not very high. This is caused by ().

A) the line spacing is not close enough; B) the step distance is too small; C) The blade of the ball cutter is not sharp; D) The cutting speed of the ball cutter tip is almost zero.

37. The grating ruler is ().

A) An extremely accurate tool for directly measuring displacement.

B) functional modules of numerical control system

C) Servo system feedback element that can indirectly detect linear displacement or angular displacement.

D) Servo system feedback element capable of indirectly detecting linear displacement.

38. The CNC machine tool bore the inner hole by the spindle feed. If the lathe bed guide rail and the spindle are not parallel, it will cause errors in the hole () of the workpiece.

A) taper b) cylindricity c) roundness d) straightness

39. When milling with () method, the durability of the milling cutter is higher, and the surface roughness value of the machined surface is smaller.

A) symmetrical milling b) reverse milling c) forward milling d) vertical milling

40. In order to ensure personal safety, in general, the safe voltage regulation of electrical equipment is ().

A)42V B)36V C)24V D) 12V

Second, the judgment question (fill in brackets with the judgment result. Fill in "√" correctly and "×" incorrectly. each

Small problem 1, ***20)

1. After the NC machine tool is turned on, the operation of returning to the reference point must be carried out first. ( )

2. The purpose of annealing is to improve the microstructure of steel; Improve strength; And the cutting performance is improved. ( )

3. The diameter of the bottom hole before thread milling must be greater than the thread diameter specified in the thread standard. ( )

4.Goo and G0 1 have the same trajectory, but the speed is different. ( )

5. The characteristic of macro program is that variables can be used, and operations cannot be performed between variables. ( )

6. After the mirror function takes effect, the tool can realize the mirror instruction at any position. ( )

7. When using G02/G03 instruction to program the arc of the machined part, the center coordinates I, J and K are the component vectors of the vector from the arc end point to the arc center in the directions of X, Y and Z coordinate axes (the vector direction points to the center of the circle). ( )

8. In contour milling, if the tool radius compensation instruction is compiled, the establishment and cancellation of tool compensation should be carried out on the contour, so as to ensure the machining accuracy of the parts. ( )

9. In the numerical control machine tool, all control signals are sent by the numerical control system. ( )

10. In the initial program of G4 1 or G42, the tool can be turned less than 90? Angle, in the state of tool radius compensation does not contain the tool compensation vector program section can have two sections. ( )

1 1. Fully closed-loop CNC machine tool, which can compensate the reverse clearance. ( )

12. The greater the rake angle of the tool, the harder it is for chips to flow out, the greater the cutting force, but the higher the strength of the tool. ( )

13. The main purpose of ball screw pair to eliminate axial clearance is to reduce friction torque. ( )

14. The single workbench of CNC machine tool adopts multi-station fixture. In the process of machining, in order to improve efficiency, the workpiece can be loaded and unloaded. ( )

15. When machining the inner contour with the end milling cutter, the diameter of the milling cutter should be less than or equal to twice the minimum radius of curvature of the inner contour of the workpiece. ( )

16. In contour machining, the radial and axial runout accuracy of the spindle does not affect the contour accuracy of the workpiece. ( )

17. The numerical control turntable is not the rotating coordinate axis of the machine tool and cannot be linked with other coordinate axes. ( )

18. When boring stainless steel and heat-resistant steel materials, extreme pressure cutting oil can reduce the influence of cutting heat, improve tool life and reduce the roughness value of cutting surface. ( )

19.f and s instructions are modal instructions. ( )

20. In Fanuc system, the F value in G33 thread processing instruction is the feed instruction per minute. ( )

1. According to the type of servo system, it can be divided into (1) open-loop servo system CNC machine tools (2) closed-loop servo system CNC machine tools (3) semi-closed-loop servo system CNC machine tools.

2. The process of NC system determining tool path according to a certain method is called interpolation.

3. Interpolation methods can be divided into pulse interpolation method and incremental interpolation method.

4. Pulse interpolation method outputs pulse sequences such as point-by-point comparison method and digital integration method.

5. Incremental interpolation method outputs increment, such as digital increment method.

6. The hardware of numerical control system generally includes: input interface, CPU, memory and output interface.

7.CPU is the floorboard of arithmetic unit and controller, and the input-output interface is the channel responsible for information exchange.

8. Point-by-point comparison method can realize linear interpolation and circular interpolation with high interpolation accuracy.

9. When performing circular interpolation, the existing position of the tool is the starting point coordinate of the circular arc. When programming, you need to calculate the coordinates of the end point of the arc, the radius r of the tool or the center of the circle, and then mark the direction of the arc.

10. Common numerical control instructions include preparation function instruction G and coordinate function instructions X, Y and Z. Auxiliary function instruction M, feed function instruction F, spindle speed instruction S and tool function instruction T..

1 1. Coordinate function instruction, also known as size instruction, is used to set the displacement of each coordinate of the machine tool, generally starting with X, Y, Z, U, V and W, followed by+or-symbol and a series of numbers.

12. Programmable controller is also an industrial control computer, but the interface between this general computer and industrial process is stronger, and the programming language suitable for control requirements is more direct.

13.PLC is very similar to computer control system, and it also has central processing unit (CPU), memory, input/output interface (I/O), power supply, etc.

14.PLC replaces the traditional relay logic of high-voltage sequence of machine tools, and realizes all kinds of joint control by logical operation, which is between numerical control and machine tools.

15. The machining accuracy of CNC machine tools depends on the accuracy of position servo, and the actual feedback position is detected by position detection sensor device.

16. China has formulated the standard JB/T305 1- 1999, which is equivalent to ISO84 1. The rules are as follows: (1) the principle of the movement of the tool relative to the stationary workpiece; (2) the provisions of the standard (machine) coordinate system.

17. The so-called absolute coordinate is the coordinate value indicating the movement position of the tool (or machine tool), which is given relative to the fixed coordinate origin, while the incremental coordinate value is obtained by increasing (or decreasing) relative to the previous position.

18. The coordinate system of CNC machine tools is divided into machine tool coordinate system and workpiece coordinate system.

19. Reasonable arrangement of six support points to limit the positioning of six degrees of freedom is called complete positioning.

20. Positioning datum is divided into coarse datum and fine datum.

2 1. Take the blank surface as the datum plane to measure the coarse datum, and use the machined workpiece datum to measure the fine datum.

22. The contour lines that make up parts can be composed of many different geometric elements, and the connection points between geometric elements are called base points. Obviously, there can only be one geometric element between adjacent base points.

23. The execution process of GOO: the tool accelerates from the program starting point to the maximum speed, then moves quickly, and finally decelerates to the end point, so as to realize quick point positioning with high positioning accuracy.

24.Go 1 is the modal code, and the feed speed is determined by the F instruction. If there is no F instruction before the program segment and there is no F instruction in the segment, the machine tool will not move after reading the program segment.

25. A function composed of a set of commands is recorded in memory like a subroutine. This set of commands is called macro program body, or macro program for short.

26. Commands used to compile macro programs are called user macro instructions, or macro instructions for short.

27. A program segment consists of a program segment number, an address symbol, a data word and a symbol.

28. The intersection of the cutter shaft of the end milling cutter and the bottom surface of the cutter is called the cutter site. The starting point of the tool movement relative to the workpiece is called the tool point.

29. There are generally three methods for tool alignment: manual tool alignment, tool alignment instrument alignment and automatic tool alignment.

30. When the NC milling machine executes the circular arc instruction, I, J and K represent the coordinates of the center of the circular arc, which are the incremental values of the center relative to the starting point of the circular arc in the X, Y and Z directions, and can also be regarded as the coordinate values of the center relative to the starting point of the circular arc.

Second, multiple-choice questions:

1. 1.c CNC machine tool, he wants to control more than two coordinates at the same time, so he must have interpolation function.

A, point control b, straight line control c, contour control

2. Install the measuring feedback element at the end of the motor or the end of the ball screw. This kind of CNC machine tool is called B machine tool.

A, open-loop CNC B, semi-closed-loop CNC C, closed-loop CNC

3. CNC machine tools belong to B control.

A, software type b, hardware type c, point type

4, CNC system has RS232 interface, its role is B. ..

A, storing information B, the off-site computer inputs the information into C to clear the error information.

5, make the tool move along a certain trajectory, so as to remove the correct workpiece shape, such a control method is called a..

A, interpolation process B, deviation discrimination C, CPU control

6.CPU has C function and control function.

A, mathematical operation b, logical operation c, mathematical operation and logical operation

7, circular interpolation operation is, you must know that the parameters are B and direction.

A, coordinates and radius of arc starting point b, coordinates and radius of arc ending point c, coordinates and radius of arc starting point.

8. Grating sensor is a kind of C measuring device, which has the advantages of high precision and fast influence speed.

A, differential type b, contact type c, non-contact type

9. The pulse generator has high precision, compact structure and reliable operation, and is a commonly used detection element.

A, angular displacement number b, inductive type c, linear displacement

10, PC is a programmable controller based on A, which has the functions of programming and storage control technology.

A, microcomputer b, medium-sized computer c, portable computer

1 1, the point-by-point comparison method can realize C interpolation with high interpolation accuracy.

A, straight line b, arc c, straight line and arc

12, the function code AC of NC machine tool stands for B,

A, direct automatic control B, adaptive system of machine tool spindle C, computer-controlled automatic machining

13, the z axis of CNC machine tools is generally a, and its positive direction is d.

A, machine tool spindle B, perpendicular to the spindle direction C, close to the workpiece direction D, away from the workpiece direction

14, the magnetic grid is a digital sensor for measuring a.

A, linear displacement b, angular displacement c, linear and angular displacement

15, the commonly used numerical control instruction is a, and the auxiliary function instruction is d.

Britain, Canada, Britain, France, Germany, China.

16, the coordinate function instructions commonly used to set the displacement of machine tools are C.

Answer, answer, answer, answer, answer, answer, answer, answer, answer

17, CNC machine tool feed function instruction b, used to specify the speed of the tool relative to the workpiece movement.

A, Sri Lanka, Pakistan, France and Spain

18 is a programmable programming language evolved from electrical control schematic diagram. Called B, the image is intuitive and practical.

A, FUNUC language b, ladder diagram c, casa language.

19, the ladder diagram of PC is C. Timing and counting are realized by software, which is convenient to use and flexible to modify.

A. ultra-micro relay b, micro relay c and internal relay

20. Each ladder diagram network consists of multiple steps, each A can form a step, and each step can be composed of multiple branches.

A, output element b, programming element c, internal relay

2 1, C of CNC machine tools can be divided into linear displacement measurement and rotation angle measurement according to different detection objects.

A, a workbench b, a servo mechanism c and a detection device

22. CNC machine tools are divided into digital measurement and analog measurement according to the choice of B.

A, sensor type b, detection signal c, machine tool structure

23, PC command statement has the advantage of convenient typing, in the branch of programming, the number of elements of C.

A, less B, not more than 1 1 C, generally unlimited.

24, programmable controller has a stronger interface with industrial process and more direct B application and control requirements. ..

A, operation method B, programming language C, machine structure

25. Replace the control circuit in B with the PLC in the circuit diagram.

A, main circuit B, relay control system C, logic circuit

26, PLC programming, editing, relying on its external equipment to input it into the machine, and can debug and monitor it.

A, programmer b, keyboard c, optical motor

27. The contact in the ladder diagram represents A, which is divided into two forms: normally open and normally closed.

A, logic control condition b, relay c, contactor

28. The coil in the ladder diagram represents B, and the box represents the instruction of specific function.

A, relay coil B, logic output result C, contactor coil

29, CNC machine tool processing accuracy depends on the accuracy of a. ..

A, position servo b, feed system accuracy c, spindle rotation accuracy.

30, CNC milling machine (or machining center) machine tool coordinate system determination, generally should first determine the C, the final determination is often based on the right-hand rule of the B axis. ..

a、X、B、Y、C、Z

3 1, there are four layouts of lathe bed and skateboard * * *, among which A has the best manufacturability and is convenient for machining the guide shaft surface.

A, flat bed b, inclined bed c, vertical bed

Generally, the bed layout of small CNC lathes mostly adopts C, which has good processing technology and convenient chip removal.

A, flat bed b, inclined bed c, flat bed and inclined slide plate

33. The advantages of CNC turret are B, fast indexing speed and good rigidity.

A, the reverse positioning accuracy is high; b, the repeated positioning accuracy is high; c, the axial positioning accuracy is high.

34. The inclined lathe bed has small inclination angle, inconvenient chip removal and large inclination angle, and the guide rail guidance and stress situation C,

A, good b, average c, poor

35. The roller guide rail has a great reaction to the installation deviation. When there is a slight deviation in the parallelism between the support shaft and the guide rail, it will also cause deviation and sideslip. The smaller roller is larger than the larger roller A. ..

A, sensitive B, insensitive C, equally sensitive

36. The numerical control device transforms and amplifies the feed pulse signal to become the displacement device B of the machine tool table. ..

A, CNC output socket B, servo system C, position feedback system

37. The front support of the spindle bearing of the CNC machine tool adopts a combination of double-row short cylindrical roller bearing and 60-degree angular contact double-row centripetal thrust ball bearing, and the rear support adopts centripetal thrust ball bearing, which is suitable for a CNC machine tool.

A, general (general) B, high speed, high precision, light load C, medium precision, low speed and heavy load

38. The front support of CNC machine tool spindle bracket adopts double-row tapered roller bearing, and the rear support adopts single-row tapered roller bearing. This structure is suitable for C CNC machine tools.

A, general (general) B, high speed, high precision, light load C, medium precision, low speed and heavy load

39. The spindle of the machining center is equipped with a quasi-stop device, which can ensure that the quasi-stop accuracy of the spindle in the axial position is within 0, for the sake of B. ..

A, change the speed without drilling; B, reasonable tool change; C, should observe the tool alignment and processing.

40. The compressed air channel of the central through hole of the spindle pull rod of the machining center (milling machine) leads to the taper hole of the cutter loading, with the purpose of C.

A. automatically tighten the tool rest B. automatically unload the tool C. remove the chips and dust in the spindle hole.

4 1, a new special bearing for ball screw with outer ring, can bear great axial force, and its stiffness is being improved to twice that of ordinary angular contact bearing, and its structure is changed to B.

A. The contact angle is 45, reducing the number of balls and increasing the ball diameter.

B. When the contact angle is 60, the ball diameter decreases and the number of rolling balls increases.

C. When the contact angle is 30, the diameter of the ball and the number of rolling beads increase.

42. Because the ball screw pair has high rotation efficiency and no self-feeding effect, it must be equipped with a braking device, usually a C device.

A. hydraulic brake (shaft) braking B. claw clutch C. friction clutch controlled by electromagnetic coil spring

43, the protection of ball screw pair should take C as the main consideration.

A. lubrication B. cooling C. cleaning (to avoid raw material particles, dust and chemical plants)

44. At present, the spindle of machining center often adopts AC variable frequency spindle motor, which not only greatly simplifies the mechanical speed change structure, has no impact vibration of rotation and reduces noise, but also has a wide range of stepless speed change. His characteristic curve has a characteristic at low speed and a characteristic at a certain high range.

A. constant torque B. constant power C. constant speed, rising power D. constant speed, rising torque

45. CNC window adopts AC variable frequency and branch speed regulating motor (positive axis motor), which can continuously change speed and has a wide range. C cutting with control instructions can also be realized when turning threads and taper.

A. constant torque B. constant power C. constant linear speed

46. The pillar automatic tensioning mechanism of machining center is mainly aimed at C ..

A, saving the physical strength of workers; B, tool change is safe and reliable; C, the tool is automatically loaded and unloaded between the spindle and the tool magazine.

47, ball screw single nut structure clearance mainly adopts C structure.

A. gasket gap adjustment type B. tooth difference gap adjustment type C. miniature interference ball

48. The characteristic (disadvantage) of the ball guide rail is C, and the rail surface is generally used.

A. strong rigidity, but small bearing capacity. B. strong bearing capacity, but poor anti-vibration ability. C. small bearing capacity and low stiffness.

49, CNC window machine coordinate system is composed of axis A and axis X and Z..

A. the intersection of the fixture end face and the spindle axis B. the workpiece origin C. the machine tool stops mechanically.

50. When compiling, first find out the design datum on the drawing, and try to ensure that this point coincides with the positioning datum, which is called A. ..

A. workpiece origin B. machine tool origin C. mechanical origin

5 1. Generally, the C-degree of freedom should be removed when machining the box.

A.3 B. 4 C.6

52, for CNC system without tool offset operation function, it is necessary to calculate the basis points and nodes of A.

A. Tool center trajectory B. Theoretical contour trajectory C. Actual contour of workpiece

53. It is a relatively simple curve fitting method to replace the list curve with a curve composed of several tangent arc segments, which is called B fitting.

A. Newton interpolation B. arc spline C. cubic spline curve

54. When machining a simple main surface by wire cutting, the main surface is regarded as the superposition of countless plane curves, and the main surface is divided into countless straight lines according to the allowable range of A. ..

A. surface roughness B. dimensional accuracy C. workpiece shape accuracy

55. G00 expresses that positioning cannot use F instruction to set the actual route of the tool (in CNC car) is C. ..

A. straight line B. oblique line C. broken line

56.G0 1 is a modal instruction. If there is no F instruction before the program segment and there is no F instruction in this program segment, the machine will move B after reading this program segment.

A. press G00 for fast feed. B. the machine tool can't feed. C. choose any speed at random.

57.G02, G03 instructions are given at the same time, I. K instruction and R instruction, press A. ..

A.r instruction takes precedence. B. press IK first. C. both are effective at the same time.

58. Record works composed of a set of instructions in memory. This set of commands is called C. ..

A. subroutine B. mirror function C. macro program

59. When a program appears repeatedly, it can be stored as a fixed program in advance. This set of programs is called B.

A. macro program B. subroutine C. mirror function

60. In Fanuc6t, the G 13 instruction is used to make the part figure symmetrical with the origin. We call this G 13 function the A instruction.

A. mirror processing B. macro instruction function C. fixed loop instruction

6 1. In the program segment of NC machining, there is no instruction address, no separator, only regular digital multiples. Such a program segment is called B format.

A. Variable program segment B. Fixed program segment C. Standard program segment

62. The vertical milling machine (or machining center) processes a CNC turntable in its horizontal position (workbench), which is called adding a C axis.

A. ABC

63. On the horizontal CNC milling machine, adding a CNC workbench in the horizontal position of its workbench is called adding a B axis.

A. ABC

64. When G00 is executed for the tool in the machining center: If G00, x100y120z160 is taken, the tool path at this time is a C straight line.

A. one article b, two articles c, three articles

65. When grooving or drilling by milling machine, the groove bottom and hole bottom have surface roughness requirements, then the instruction A is applied at this time, and the number after the instruction is seconds or milliseconds.

A.G04 B. G40 C. G 15

66. Small CNC milling machine (vertical milling) X, Y and Z are all table movements and movements, and the programming of table descent should be confirmed as C axis is D direction.

A.x (u) b.y (v) c.z (w) D. Positive (+) E. Negative (-)