数控过级考试题及答案（NC over grade examination questions and answers）

数控过级考试题及答案（NC over grade examination questions and answers） 数控过级考试题及答案(NC over grade examination questions and answers) Examination paper number: 001 Score Raters First, individual choice (first questions to eightieth questions). Choose the right answer and put the letters in the brackets. 1 points for each question, 80 points. ) 1. the content of professional ethics does not include (C). (A) professional ethics awareness (B) professional ethics code of conduct (C) practitioners' rights (D) code of conduct 2. workers, love cards, knives, measuring approach (C). (A) the correct use of work, cards, knives, measuring tools (B), work, cards, knives, measuring tools should be placed in the prescribed place (C) free assembly and disassembly, cards, knives, measuring tools (D) according to the provisions of the maintenance of workers, cards, knives, measuring tools 3. not consistent with the requirements of clean and civilized production is (B). (A) wear protective equipment (B) according to the regulations and do not require clothing in the work (C) comply with safety technical procedures (D) and implement rules and regulations 4. keeping the working environment clean and orderly is not correct (B). (A) remove oil and water (B) channels at any time and place less items (C) a clean working environment can stimulate the spirit (D), semifinished products and semi-finished products are piled up neatly according to the regulations 5. in the choice of benchmark system should be preferred (A). (A) base hole system (B) base axis (C) mixing (D) system 6. correct description of "gap" is: (B). (A) the gap value before no plus (B) before the gap value must be positive (C) before there can be a gap value (D) clearance value cannot be zero One of the properties that 7. bearing alloys should have is (C). (A) sufficient deformation strengthening ability (B) sufficient electrical conductivity (C) sufficient plasticity and toughness (D), good magnetic properties 8. tin base bearing alloy is an alloy composed of alloying elements such as (C) in tin. (A) carbon, nitrogen (B), iron, nickel (C), antimony, copper (D), chromium, molybdenum 9. (B) is the transmission of motion and power consisting of chain and sprocket with special tooth shape. (A) gear drive (B) chain drive (C) screw drive (D) belt drive 10. according to the different gear shape, the gear drive can be divided into two categories: (B) drive and bevel gear drive. (A) helical gear (B) cylindrical gear (C) straight gear (D) gear rack 11. which of the following micrometers does not exist (D)?. (A) inner micrometer (B) depth micrometer (C) thread micrometer (D) gear micrometer The 12. micrometer differential cylinder is uniformly inscribed with (A) lattice. (A) 50 (B) 100 (C) 150 (D) 200 13. the direction of the inside micrometer and the direction of the outside micrometer (B). (A) the same (B) contrary (C) consistent (D) is clockwise The 14. is the value of the index dial indicator (B). (A) 0.1 (B) 0.01 (C) 0.001 (D) 1 The structure of the 15. cylindrical gear is divided into two parts: the gear ring and (B). (A) gear (B) wheel body (C) hole (D) cylinder 16. the lathe spindle box gear surface processing order is hobbing (B) shaving, etc.. (A) gear grinding (B) gear shaping (C) honing (D) milling 17. cutting fluid is penetrated into the tool, chip and workpiece, forming (A) can reduce friction. (A) the cooling film of D (B) membrane (C) 18. (C) plays a major role in lubrication. (A) aqueous solution (B) emulsion (C) cutting oil (D) rust inhibitor 19. chisel generally consists of carbon tool steel forging, after heat treatment the hardness (C). (A) HRC40 ~ 55 (B) HRC55 ~ 65 (C) HRC56 ~ 62 (D) HRC65 ~ 75 20. the incorrect description of the switch is (D). (A) combination switch structure is compact (B) inverted switch handle can only rotate within 90 degrees (C) combination switch is usually used in machine tool control circuit (D) reversing switch, which is usually used in large capacity motor control circuit The selection of rated current for 21. fuses has nothing to do with (D). (A) the operating frequency of the rated voltage (D) switch of the environment (B) load characteristic (C) line 22., the quality policy of enterprises is not (A). (A) quality records of process regulations (B) the quality standards that each worker must implement (C) the quality objectives of enterprises (D) the quality orientation of enterprises 23. the content that does not belong to the post quality requirement is (B). (A) the quality requirements of each job (B) quality records (C) operation procedure (D) market demand 24. does not belong to the post quality measure and responsibility is (A). (A) the quality responsibility of the post is the quality requirement of the post (B), and the post work should be carried out according to the technical regulations (C) define the responsibility for the corresponding quality problems among different shifts (D) and define the quality standards of the post work The 25. pattern is called tolerance (T) symbol (A). (A) position, squareness (B) shape, straightness (C) size, deviation (D) shape, cylindricity The structural feature of the 26. eccentric shaft is that the two axis (B) does not coincide. (A) perpendicular (B) parallel (C) intersection (D) tangent In the drawing of 27. gears, the dividing circle is represented by (D) line. (A) straight (B) size (C) fine solid (D) point sorting The spline width of the 28. gear is 8, and the minimum limit dimension is (C). (A) 7.935 (B) 7.965 (C) 8.035 (D) 8.065 29. semi finishing and finishing of worm gear generally adopts two center clamping, and uses (A) chuck dividing line. (A) indexing (B) three claw (C) special (D) eccentric 30. C with two or more than two threads distributed equally in the axis, which is called multi thread. (A) the length of D (B) thread (C) thread 31. to increase the contact area of the clamping, special soft claws and (C) can be used, so that the clamping force can be evenly distributed, and the color change of the workpiece can be reduced. (A) sleeve (B) fixture (C) slotted sleeve (D) positioning pin 32. CNC lathe cutting amount selection should be based on machine performance, (B) principle and combined with practical experience to determine. (A) NC (B) machining (C) tool (D) cutting 33. clamping (B), reliable, and ensure that the workpiece in the processing of the position unchanged. (A) correct (B) firm (C) meets the requirements (D) appropriate 34. the clamping force (C) should be relative to the supporting point, and try to act on the parts with better rigidity, so as to reduce the deformation of the workpiece. (A) the size (B) tangent point (C) point (D) direction 35. the machining of long and slender shafts requires the use of the center frame and the heel rest to increase the (D) rigidity of the workpiece. (A) work (B) machining (C) rotary (D) clamping 36. eccentric workpiece clamping methods: two top clamping, four jaw chuck clamping, three jaw chuck clamping, eccentric chuck clamping, double chuck clamping, clamping fixture (C) and so on. (A) combination (B) C eccentric (D) pneumatic 37. compared with common lathe tools, CNC lathe tools have higher stiffness and longer (C). (A) tool head (B), tool bar (C) life (D) hardness 38. CNC lathe with (D) axis direction is Z axis direction, the tool away from the workpiece direction is Z axis in the positive direction. (A) spindle (C) light rod (D) spindle of slide plate (B) lathe bed 39. the relative position between the reference point and the origin of the machine is determined by the (D) block of the Z to the X. (A) measuring (B) electric (C) hydraulic (D) machinery 40. if the NC lathe needs radius programming, the relevant parameters in the system should be changed so that (A) is in the radius programming state. (A) system (B) spindle (C) slide plate (D) motor 41. interpolation process can be divided into four steps: (C) discriminant, coordinate feed, deviation calculation and endpoint discrimination. (A) relation (B) the starting point of the left hand (C) deviation (D) 42. deviation calculation is to calculate the deviation between the cutter and the ideal line when the tool moves to the new position, so as to determine the next step (D). (A) numerical (B) coordinate (C) program (D) trend 43. G00 code function is fast positioning, it belongs to (A) code. (A) modal (B) non modal (C) criterion (D) ISO 44. G32 code is the thread (D) function, it is the basic function of FANUC 6T CNC lathe system. (A) cycle (B) tool setting (C) using (D) cutting 45. G65 code is FANUC (OTE) - A CNC lathe system call (B) function. (A) subroutine (B) macro instruction (C) parameter (D) tool The 46. (D) code is the feed function of each turn in the FANUCOTE - A CNC lathe system. (A) G94 (B) G 98 (C) G97 (D) G99 47. after completing other instructions in the program segment with M00 code, the spindle stops, the feed stops, (C) closes, and the program stops. (A) cutting tool (B) panel (C) cutting fluid (D) G function 48. M02 function code is commonly used in the program reset and rollback tape to "program (A)" character. (A) start (B) end (C) run (D) breakpoint 49. when the spindle needs to change the rotation (C), the M05 code should be used to stop the spindle rotation, and then to specify M03 or M04 code. (A) speed (B) angle (C) direction (D) start stop The 50. M99 instruction function code is the end of the subroutine, even if the subroutine (A) comes to the main program. (A) return (B) jump (C) embedding (D) setting The coordinates of the 51. Z direction (B) can be located on the right end face or the left end face or the other position according to the technical requirements. (A) end point (B) zero point (C) value (D) reference point 52. arc interpolation (G02, G03) instructions, I, K is incremental and vector, with (D), so with positive and negative sign. (A) uniform (B) norm (C) special (D) direction Fifty-three Cylindrical thread, taper thread and (C) thread can be machined by G32 thread cutting instruction. (A) trapezoidal (B) end face (C) rectangular (D) worm 54. processing pitch of 2 mm cylindrical screw tooth depth is 1.299mm, the first engagement for the (B) mm. (A) 1 (B) 0.9 (C) 0.8 (D) 0.7 The calculation formula of the deceleration segment in 55. thread machining is: delta 2 = (A) nP. (A) 0.00042 (B) 0.0042 (C) 0.024 (D) 0.0021 56. if the thread depth is deep, the pitch is larger, but the fractional feed, feed back engagement (D) according to the law of distribution. (A) cycle (B) decreasing (C) feed (D) decline The instruction format of 57. () thread is: G34 X (U) - Z (W) - F - (B) 1. (A) (B) variable lead (C) end face (D) multi head 58. along the direction of tool (A), the tool radius compensation at the right side of the workpiece contour line, called the tool radius right compensation function. Feed (A) (B) side (C) level (D) front end 59. each tool compensation number has a set of offset X, Z, tool radius compensation R and blade tip (A) number T. (A) D (B) size (C) compensation 60. after the power supply, the (C) display whether there is any alarm display. If there are problems, should be dealt with promptly. (A) digital (B) analog (C) CRT (D) PTA 61. before starting, check whether the parts of the lathe are intact and normal according to the check card (B) of the equipment, and whether the safety protection device of the lathe is firm or not. (A) specification (B) specification (C) model (D) content 62. manual programming is from the analysis of parts drawings, determine the process of processing, (B) calculation, writing parts processing program, preparation of control media to program verification are manually completed. (A) coordinate (B) numerical (C) function (D) surface 63. in the preparation of NC program for actual machining, must be measured the size of each tool and the actual (B) position. That is to determine the distance between the tool tip of each tool and the fixed point on the machine tool, so as to set the compensation parameters of the cutter and set the corresponding parameters accordingly. (A) the end point of (B) installation (C) coordinate (D) The 64. (A) type CNC lathe is configured with FANUC OTE - A - 2 system operation panel. (A) CK3225 (B) CW3225 (C) XHK714 (D) ZK3225 The 65. symbol key is used to input symbols when programming, and (B) keys are used especially for the end of each program segment. (A) ES (B) EOB (C) CP (D) DOC 66. in the MDI state, according to the main function of "(D)" key, the screen shows the MDI mode. (A) OFF (B) PAGE (C) MENU (D) PRGRM The 67. "JOG" key is to make the CNC system in (C) state, (A) single segment (B) lock (C) point action (D) preparation 68. select the "status switch" in "" position, select "0.001" to "C" feed by step select switch, and press the moving point of moving O.001 to 1 mm each time by "point moving button" tool holder. 1mm. (A) machine tool (B) rapid (C) single step (D) movement Sixty-nine The feed rate selector switch can adjust the feed rate in the automatic feed operation. The range of F code is (C). (A) 1 - 15% (B) 20 - 150% (C) 5% - 150% (D) 10% - 100% 70. spindle stop button plays a role in (C) working state. (A) feed (B) preparation (C) all (D) changes 71. in the automatic cycle operation, press the feed hold button, the turret immediately stop, red indicator light. If the lathe is to continue working, it must press the "cycle start button", (A) "feed hold" state. (A) cancel (B) entry (C) execution (D) adjustment There are (B) buttons for the chip breaker of 72. CK3225 CNC lathe. (A) two (B) three (C) 1 (D) four 73. press the "(A) button" to relieve the alarm state of the control machine, and the machine can resume the normal working state. (A) RESET (B) AUX (C) ON (D) OFF 74. N0010 M03 S400 T0101 program; said spindle is turn, speed of 400R / min (D), adjustable knife, knife mark 01. (A) 3 (B) 4 (C) 10 (D) 1 75. gauge except as the benchmark of dimensions, but also widely used in identification and measuring instrument (D). (A) calibration of positive (B) detection (C) comparison (D) 76. the right angled edge of a right triangle is known as (C) mm, the angle between it and the bevel is 23 degrees, 30 ', 17', and the length of the other right angle is 28.95mm. (A) 60.256 (B) 56.986 (C) 66.556 (D) 58.541 77. eccentric shaft workpiece drawing, diameter of phi 40 (C), the size limit is Phi 39.8 mm. (A) upper deviation (B) minimum (C) maximum (D) deviation 78. formulas of gauge height "(B)" said block group size in millimeters. (A) a (B) H (C) L (D) s 79. measuring the amount of the outer cone has the test plate, two diameter of the same cylindrical test rod, (C) ruler, etc.. (A) right angle (B) depth (C) 1000 (D) steel plate 80. measurement of outer cone, the workpiece (B) test in end plate, two sticks on the plate close to the workpiece, measured with a micrometer distance between two pins, the conversion can be indirectly measured by the small end diameter of workpiece. (A) large (B) small (C) outside (D) Score Raters Two, judgment questions (eighty-first questions to 100th questions). Fill in the parentheses with the result of the judgment. Fill in the "V" right and wrong "fill *". 1 points for each question, 20 points. ) 81. (V) of the work attitude and dedication is the primary requirement of employees. 82. (V) usually tool material, higher hardness, better wear resistance. 83. (V) types of commonly used tool materials are carbon tool steel, alloy tool steel, high-speed steel and hard alloy steel. 84. (V) of carbon tool steel and alloy tool steel for the manufacture of medium and low speed forming tool. 85. (V) commonly used hard alloy grades YG3. 86. (*) hinge cone hole, must be in accordance with the main diameter cylindrical hole can be drilled, reaming. 87. (V) draw the parts diagram, if in accordance with the real graphic projection draw all the "tooth" and their "teeth", not only is very complex, it is not necessary. 88. (V) CA6140 type lathe tail seat is pressed on the bed, the handle rotates the eccentric shaft, The rod can drive the lever and the press plate to rise and fall, so that the tail seat can be pressed or loosened. 89. (x) drawing assembly drawing according to the actual size and complexity of the parts, determine the appropriate proportion and map width. 90. (x) CNC lathe is separated from the structure of ordinary lathe. It is composed of lathe bed, spindle box, tool rest, cooling and lubrication system. 91. (x) move in the direction of the Z axis to represent. 92. (V) in order to meet the processing requirements of the main part, positioning is allowed. 93. (V) AUTOCAD is a computer graphics software. The calculation formula of the rising speed feed section in the 94. (x) thread processing is: delta 1 =0.0015LP. 95. (x) graphic interactive automatic programming is a system 3 developed in recent years. It needs to write source program. 96. (x) "cycle start button" only works in reset state. 97. (x). When testing the parts with high precision axial dimension, it should be placed on the movable table. 98. (x) for the two hole center distance with low precision, the measuring methods are different. 99. (V) Tr 36 * 12 (6) said the nominal diameter of phi 36 trapezoidal double thread, pitch of 6 mm. 100. (V) formula three needle measuring worm "Ms" said axial modulus worm. Examination paper number: 001 First, individual choice (first questions to eightieth questions). Choose the right answer and put the letters in the brackets. 1 points for each question, 80 points. ) 1. C 2. C 3. B 4. B 5. A 6. B 7. C 8. C 9. B 10. B 11. D 12. A 13. B 14. B 15. B 16. B 17. A 18. C 19. C 20. D 21. D 22. A 23. B 24. A 25. A 26. B 27. D 28. C 29. A 30. C 31. C 32. D 33. B 34. C 35. D 36. C 37. C 38. D 39. D 40. A 41. C 42. D 43. A 44. D 45. B 46. D 47. C 48. A 49. C 50. A 51. B 52. D 53. C 54. B 55. A 56. D 57. B 58. A 59. A 60. C 61. B 62. B 63. B 64. A 65. B 66. D 67. C 68. C 69. C 70. C 71. A 72. B 73. A 74. D 75. D 76. C 77. C 78. B 79. C 80. B Two, judgment questions (eighty-first questions to 100th questions). Fill in the parentheses with the result of the judgment. Fill in the "V" right and wrong "fill *". 1 points for each question, 20 points. ) 81. 82. 83. 84. tick tick tick tick 85. 86. * 87. 88. tick tick tick 89. x 90. x 91. x 92. V 93. x 95. x 96. x 94. V 97. x 98. x 99. V 100. V