Multiple choice question: Which bearing cannot bear axial load? Standard twist drill top angle 2θ=?

Fill in the blank:

Q235AF represents the yield strength? MPa steel, F represents?

What is the maximum solid size, for holes? Dimensions, for the shaft?

What are the common surface treatment processes for sizes?

Metal corrosion score? and? Two categories

? and? Under certain circumstances, the connecting nut may gradually loosen

What are the basic phases in carbon steel in the annealed, normalized and quenched and tempered states? and?

Short answer calculation: Flat belt open transmission problem, given the diameter of the driving wheel, the diameter of the driven wheel, the center distance and the bandwidth, find the transmission ratio, check the wrap angle and belt length;

The friction of rubber shoes produces static electricity, capacitance, and charge. Find the voltage accumulated in the human body, and also ask about ways to reduce the accumulation of static electricity

Complementary view of the drawing question. The front view and the top view are exactly the same. They are both a square with a diagonal line. , repaint the left and right views

Additional question (not scored):

Use the 3D software you are familiar with to describe the operating steps of the picture shown (a simple circular cone);< /p>

Analysis steps of general finite element analysis software;

Use 20 words to summarize the attitudes and qualities of mechanical and electrical engineers

Written test questions for mechanical designers

1. Fill in the blanks: (1.5x20=30 points)

1. The working methods of the cylinder are divided into: _____________.

2. The effective number of thread turns for a 60° ordinary thread locking connection is ________.

3. The carbon content of No. 45 steel is approximately _____________.

4. The machine tool that is gradually being eliminated in modern mechanical processing is _____.

5. The development trend of modern mechanical processing is _______.

6. The Chinese meaning of EDM is _______.

7. The Chinese meaning of CNC is ________.

8. The function implemented by the fixture is ________.

9. Bearings can be divided into: ___________ according to friction methods.

10. Commonly used heat treatment methods are: ____________________________

(Please answer at least 4 types)

11. The output power of the motor is directly proportional to ______________.

12. Commonly used welding methods include __________________, etc. (Answer at least 3 types)

13. When welding the flange and the pipe body, in order to reduce the welding deformation, a stress groove should be opened at _______________.

14. The welding performance of 45# steel and 1Cr18Ni9Ti is __________________.

15. Common casting defects are: _______________ etc.

16. Commonly used electroplating methods can be divided into: _____________, etc. according to the coating material.

17. After sheet metal bending, ____________ will occur near the bend, which will affect subsequent processing procedures.

18. The function of adding cutting fluid during metal cutting is: _________; the metal material without adding cutting fluid during cutting is ___________.

19. In the Cartesian rectangular coordinate system, the directions pointed by the thumb, index finger and middle finger of the right hand represent _________, and the direction of rotation around the positive direction of each axis is the positive direction of rotation.

20. The three commonly used mechanical transmission mechanisms are: _______________.

2. Short answer question: (20 points)

The reason why the gear reduction mechanism cannot be completely replaced by the electronic speed regulating mechanism.

Answer:

3. Process analysis questions: (50 points) Omitted.

The following are the answers to some of the questions. Other questions require your help: 3, 0.45%

5, Automation

6, Electrical discharge machining

7, computer numerical control

8, clamping, positioning, ensuring accuracy, improving processing efficiency

9, rolling friction. Sliding friction

10, quenching, tempering, normalizing, quenching and tempering, annealing

11, frequency

12, CO2, argon arc welding, laser welding

After finishing the experiment in the afternoon, I originally accompanied my student to Osram for the written test, but ended up taking the written test myself. There are three positions: financial management, research and development, and mechanical engineer. The company did not give publicity and directly handed out test papers. I still took the mechanical questions. .

The first question is about drawing, giving the front view, the left view, please draw the top view.

The second question is about the correction of bolted connections

The fourth question is about thread (left-hand, right-hand?), what does G1/A1 mean?

No. The fifth question is, how to input the radian, plus and minus signs in AUTOCAD, FAI, etc.? (%%D, %%P,,%%C)

Sixth, draw circles and straight lines in AUTOCAD, Shortcut keys for arc, move, copy,,,,, commands.

Finally, I ask a question about the relationship between rounding and stress concentration.

It’s all a test of professional knowledge. .There are no English questions this time. The test papers for other positions are all about English questions.

Chang'an Ford written test for mechanical majors

The first choice I took was Chang'an. 'an Ford Mazda Assembly. Not only this major, but I also saw male compatriots from Dongda Machinery. I chatted with people in the waiting area. There were accountants from Nanjing University, masters from Nanjing Normal University and Nancai University. ． I didn’t ask if I was far away. I arrived very early and bought a car magazine from the newsstand because it happened to have articles related to Ford Focus. Facts have proved that this magazine is not of much use. This is Ford's last day of written examination and interview in Nanjing.

The content of the written test is divided into two parts. The first part is logical reasoning, mainly graphical reasoning and graphical induction. The second part is English writing, which is an open-ended article expressing opinions. The question is not difficult. It is easier to reason about the figures in the inference part, but it is more difficult to summarize. The main reason is that all the figures are messed up. You have to find the ones with the same rules between the two, and then pick out the one that does not conform to the rules, and most of them The graphics are very complex, and it can be seen that quite a few graphics were drawn manually at the time. The logical reasoning part has 30 questions and takes less than 20 minutes. Fortunately, I was the first to finish some similar questions when I was preparing for Civil Servants. I was sure that questions 23-26 were correct. There are many people who have finished 2/3 to 3/4 and then made random choices.

The second part is a paper distributed after the first part. It is writing and lasts 15 minutes. My question is about the establishment of mandatory and optional courses in universities, asking which one should be the majority. The idea time is also within 15 minutes. Fortunately, I have never drafted exam essays before, although I felt that some parts were missing when I finished it. I wrote enough arguments, but personally I think the idea is relatively clear. The last paragraph combined Ford and hinted at what would happen if I could enter the interview stage. ． It's not bad~at least compared to the boys from Dongda University, it's more than enough.

It can be said that Mindray’s written test questions were enough to brainwash me, and slapped me hard in the face of my previous vague professional review. Mindray's written test is large in volume and covers a wide range of topics, but it covers the most basic knowledge. Now let’s talk about the questions in detail (relying on memory only):

1. First, there are about five fill-in-the-blank choices, including tolerances, datums (roundness, perpendicularity, parallelism, etc.), metal processing heat treatment, and bolts. Engineering drawing method;

2. Then there is a mechanical drawing question, which gives the front view, left view, and cross-section, and requires drawing a top view. The parts are not complicated, but I haven’t looked at the drawing for a long time, let alone When it comes to drawing, I have forgotten a lot of basic common sense, sweat...

3. Dimension chain process calculation.

Given the fit requirements and tolerances, calculating whether the fit meets the requirements is the most basic calculation question of interchangeability;

4. Dimensioning questions. The question first gives the functional background of the part, and then marks the dimensions on the drawn part drawing, including tolerances, geometric tolerances, roughness, etc.;

5. Material mechanics question, according to the given rod Calculate the axial force, shear force, and bending moment of the pole based on the stress situation, and draw the corresponding schematic diagram (there must be a calculation process). This is very common in shaft design in materials mechanics and mechanical design, and the calculation is not complicated. It just depends on whether you know how to do it;

6. Pro/E questions. I don’t understand this question very well. It is a basic question of graphics or CAD technology. Regarding the surface composed of three curves and the surface composed of four curves, it is not a test of operations;

7. Give a part diagram (it seems to be Bearing seat), tell us its processing technology.

8. Question: Please name two important indicators of precision transmission systems and their definitions.

Additional questions: Test finite element knowledge:

(1) State the definition of finite element, commonly used finite element software, etc.;

(2) Give According to the finite element principle, state the stress conditions of a rod and state its constraints.

1 Dimension lines, dimension boundary lines, thread bottom lines and gear lines are all drawn with (thin solid lines).

2 When using the first perspective projection method to represent the workpiece view, the rear view is at the far (right) side of the left view.

3 The section line of metal materials is generally a parallel line at 45 degrees to the horizontal direction. However, when (the main contour line is at 45 degrees to the horizontal direction), it can be drawn at 30 degrees or 45 degrees to the horizontal direction. parallel lines.

4 Dimensional tolerance refers to (the allowable variation in size).

5 In metals and alloys, they are mainly (metallic bonds), but sometimes other bonds are mixed to varying degrees.

6 The only characteristic of a crystal is that it has a certain melting point, and another characteristic is (anisotropy).

7 In the iron-carbon alloy phase diagram, the eluting transformation temperature is (727 ℃)

8 The carbon content 〈 (2.11%) is carbon steel, 〉 ( ) is cast iron.

9 The structure obtained after the quenching and tempering treatment of carbon steel should be (sorbite).

10 The most effective method for deforming the high-speed steel milling cutter after quenching is the tempering correction method.

11 Geothermal defects and band-like structures such as Widmanstatten structure and coarse grains that appear in medium carbon structural steel castings, forgings, rolled parts and welded parts can be eliminated through (normalizing) treatment.

12 38CrMoAl steel bore rod usually adopts (nitriding) chemical heat treatment.

13 Automobile transmission gears generally use chemical heat treatment (carburization)

14 The strength of carbon nanotubes is (100) times that of steel.

15 The purpose of light-guiding fibers is (to transmit energy).

16 The cemented carbide that can be processed, forged, welded, and heat treated is (steel-bonded cemented carbide).

17 Car steering wheels, decorative panels in aircraft cabins, soundproof panel window frames, etc. are finally made of engineering plastics (ABS plastics) that are hard, tough and rigid.

18 Internal combustion engine spark plugs are made of (alumina) ceramic materials.

19 For parts such as chemical pipeline pumps that require corrosion resistance and aging resistance, (polytetrafluoroethylene) engineering plastics can be used.

20 The three major solid materials refer to (metal materials, ceramic materials, and polymer materials).

21 The most traditional and accurate method for determining the chemical composition of metal materials is (chemical analysis method ).

22 To measure the hardness of metal materials with coarse grains or phases such as gray cast iron and bearing alloys, as well as the hardness of steel parts after annealing, normalizing and quenching and tempering, the (Brinnell) hardness tester is mostly used.

23 The machine tool bed is usually made of (gray cast iron).

24 There are three constant-temperature transition lines in the iron-carbon phase diagram (peritectic transition, analyte transition, and eutectic transition).

25 The hardenability of steel depends on (carbon content).

26 The temperature of the quenching oil tank is generally controlled below (80°C).

27 Beryllium bronze can be strengthened by (solid solution aging).

28 In order to avoid and reduce oxidation and deoxidation of steel parts during heat treatment, it is best to use (vacuum furnace).

30 The commonly used strengthening and toughening method for 65Mn steel spring parts is (isothermal quenching).

31 The surface hardening of machine tool guide rails is finally heat treated (ultrasonic quenching).

33 When making a drawing die for ductile iron, chemical heat treatment (carbonitriding) is required after normalizing and tempering.

34 The reason why chaotic ripples appear when machining outer circles and holes on a lathe is (large axial movement of the lathe spindle).

35 Which of the following workpieces (flat workpieces that are difficult to clamp) is more suitable to be processed by down milling?

36 Which factor is most likely to cause burns on the workpiece surface during cylindrical grinding (the grinding wheel is too hard).

37 (Partial interchange) The assembly method should solve the assembly dimensions according to the probability method.

38 In order to ensure the coaxiality accuracy of the center height of the machine tool spindle and the center height of the tailstock, which assembly method (repair assembly method) should be selected.

39 The phenomenon that occurs when the machine tool spindle is running (the temperature of the spindle support part rises significantly) indicates that the working clearance of the rolling bearing it supports is too small.

40 The speed of general cutting processing is expressed in (m/min), and the speed of wire EDM processing is expressed in (mm2/min).

41 The minimum wall thickness that can be obtained by castings produced by different materials and different casting methods is different. When casting gray iron castings with sand molds, the minimum wall thickness that can be obtained is (3mm)

43 When the minimum wall thickness of aluminum alloy is 0.6-0.8mm, (die casting) casting should be used.

44 Different pressure processing methods cause different internal forces in the metal, so the processed metal will produce (the same) forgeability.

45 The forging specific gravity is not expressed by the (volume ratio) of the workpiece before and after deformation.

46 Free forging is divided into two types: manual forging and machine forging. Currently, machine forging is the most used. The shape and size of the forgings produced are mainly determined by the technical level of the operator.

47 The raw materials used in the stamping process are mostly metal materials with good plasticity, such as ordinary low carbon steel, copper, aluminum alloy, etc.

48 The three major categories of welding methods refer to (fusion welding, pressure welding, and brazing)

49 In welding production (electric welding) welding methods dominate.

50 The welding arc is composed of cathode area, anode area and (arc column area).

51 The welding arc temperature can reach (5000K-30000K)

52 During the welding process, 2 minutes every 5 minutes are used for changing the welding rod and cleaning slag, with continuous load of power supply rate (60%).

55 Automobile bodies generally use the (cathode electrophoresis) painting method.

56 The most widely used coating drying method in the automotive industry is (convective radiation).

57 The best choice for spraying pure molybdenum layer is ( ).

58 The best choice for long-term anti-corrosion zinc and aluminum coatings is ( ).

59 The industry that currently applies spraying technology the most is ( ).

60 Galvanized steel plates, galvanized sheets and steel strips, galvanized iron wires, etc. are produced using the ( ) production method.

61 The most widely used ( ) process accounts for more than 60% of the total electroplating volume.

62 The protective layer of thin plates used in the canning industry is ( ).

63 The electroplating used for engine cylinder inner walls, piston rings and other parts is ( ).

64 The processing quality of EDM is related to the selection of pulse power supply parameters. In order to improve the processing efficiency, which parameter should be adjusted? How should it be adjusted?

65 Which ( ) laser is commonly used for laser heat treatment of metal surfaces? Why?

66 The purpose of equipment preventive maintenance (PM) is ( ).

67 When women enter production and processing workshops, they are usually required to wear hats. The reason is ( ).

68 In order to prevent the punch from breaking off fingers in stamping equipment, the commonly used safety protection measures in the punch body operating device are ( ).

69 When operating on electrical equipment that is prone to electric shock, the most important measure to prevent electric shock is ( ).

A Wear rubber gloves to operate B Ground and zero electrical equipment

C Do not touch the uncharged conductive parts of electrical equipment D Use metal barriers around electrical equipment

70 In industrial production, due to the conversion of energy and resources, waste water, waste gas, waste residue, waste heat and radioactive substances are discharged during the production process, thereby polluting the atmosphere, water, and soil; or producing noise, Vibration, electromagnetic radiation, etc. bring harm to the surrounding environment, and the units of places, equipment and devices that can produce these harmful effects are often called ( ).

A industrial pollution source B industrial pollutant C polluting enterprise D industrial waste

71 The main pollutant in industrial waste gas is ( ).

A Sulfur dioxide, particulate matter, carbon monoxide, carbon dioxide and benzene organic matter

B Sulfur dioxide, particulate matter, carbon monoxide, ozone

C Sulfur dioxide, carbon dioxide, carbon monoxide, ozone< /p>

D Sulfur dioxide, sulfur monoxide, carbon monoxide, carbon dioxide

72 The main pollutants in industrial wastewater are ( ).

A Heavy metals, organic matter, suspended solids, radioactive substances, color, ammonia, nitrogen, phosphorus and oils

B Heavy metals, calcium carbide microorganisms

C Bacteria, suspended solids, radioactive substances

D Calcium carbide, heavy metals, bacteria, radioactive substances

73 In the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste", The "three modernizations" governance principles adopted by the state to prevent and control environmental pollution by solid waste are ( ).

A Landfilling, covering, and harmless treatment;

B The principles of total reduction, full resource utilization, and all harmless treatment

C Reduction, resource utilization, and harmlessness, that is, implementing the principles of reducing the generation of solid waste, making full and rational use of stationary waste, and disposing of solid waste in a harmless manner

D Reduction, resource utilization , Harmlessness, that is, the principle of reducing the generation of waste leachate, making full and rational use of leachate, and harmlessly treating leachate

74 my country's "Basic Citizens' Code of Ethics" is ().

A Patriotism and law-abiding, integrity and honesty, solidarity and mutual assistance, hardship and simplicity, loyalty to duty

B Patriotism and law-abiding, courtesy and integrity, unity and friendliness, diligence, thrift and self-reliance, dedication and dedication

C Patriotism and law-abiding, modesty and prudence, unity and cooperation, diligence, self-reliance

D Patriotism and law-abiding, integrity and justice, mutual respect and love, diligence, thrift and self-reliance, dedication and dedication

75 my country The "Implementation Outline for the Construction of Citizen Morality" puts forward the basic content of professional ethics ( ).

A. Be dedicated to your job, be honest and trustworthy, act fairly, serve the masses, and contribute to society

B. Be dedicated to your job, be honest and trustworthy, fair and just, enthusiastic and thoughtful, and selfless dedication

C Loving and dedicated, honest and trustworthy, fair and reasonable, hard-working and selfless dedication

D Loving and dedicated, honest and trustworthy, reasonable and legal, diligent and dedicated to society

76 The "Accounting Law" stipulates that ( ) is responsible for the accounting work nationwide.

A State Council B Finance Department of the State Council C State Administration of Taxation D National Commission for Discipline Inspection

77 ( ) commonly known as "Three Financial Statements"

A Balance sheet, profit distribution Statement, statement of receivables and payables

B balance sheet, income statement, cash flow statement

C balance sheet, cash flow statement, balance sheet

D Balance sheet, profit distribution statement, financial audit statement

78 "Enterprise Accounting System" incorporates ( ) into the accounting system for the first time, thus ensuring that accounting information is consistent with objective economic facts.

A The principle of historical cost B The principle of substance over form C The principle of prudence D The principle of objectivity

79 my country's current tax transfer tax categories include ().

80 Our country has not formulated a unified law specifically on intellectual property rights. Instead, it has formulated different individual laws, regulations and rules based on different types of intellectual property rights, thus forming the legal system of intellectual property rights in our country.

These individual laws are ().

81 my country’s Patent Law stipulates that the substantive conditions for granting patent rights for inventions and utility models are ().

82 After all capital contributions of shareholders of a limited liability company have been verified by the statutory capital verification agency, they shall apply to the company registration authority for establishment registration.

A The shareholder with the largest capital contribution B All shareholders C The chairman of the board D Representatives designated by all shareholders or agents appointed by ***

83 A joint stock company can do so under the circumstances of ( ) There is no need to convene an extraordinary general meeting of shareholders.

Answer: The answer is as follows: 1. Thin solid line 2. Right side 3. The main contour line is 45 degrees to the horizontal direction 4. Allowable size variation 5. Metal bond 6. Anisotropy 7.727℃ 8.2.11% 9. Sorbite 10. Tempering correction method 11. Normalizing 12. Nitriding 13. Carburizing 14.100 15. Energy transmission 16. Steel bonded carbide 17. ABS plastic 18. Alumina 19. Polymer Tetrafluoroethylene 20. Metal materials, ceramic materials, polymer materials 21. Chemical analysis method 22. Brinell 23. Gray cast iron 24. Peritectic transformation *** elutant transformation *** crystalline transformation 25. Carbon content of steel 26.80℃ 27 .Solid solution aging 28. Vacuum furnace 29. Oxygen, sulfur, carbon, nitrogen and boron infiltration 30. Isothermal quenching 31. Super audio quenching 32. Chromium niobium infiltration 33. Nitrogen carbon infiltration 34. Lathe spindle axial direction Large movement 35. Flat workpieces that are difficult to clamp 36. The grinding wheel is too hard 37. Partial interchange assembly method 38. Repair assembly method 39. The temperature of the spindle support part increases significantly 40.m/min mm2/min 41.3mm 42.1. 15:1.1:1 43. Die casting 44. Identical 45. Volume ratio 46. Operator’s technical level 47. Plasticity 48. Fusion welding, brazing, pressure welding 49. Electric welding 50. Arc column area 51. 5000K-30000K 52.60% 55. Cathodic electrophoresis 56. Convection radiation 57. Flame spraying 58. Arc spraying 59. Aviation engine 60. Continuous electroplating 61. Zinc plating 62. Tin plating 63. Chromium plating 64. Peak current increases during discharge time 65. Carbon dioxide power is high 66. Extension The life of the equipment ensures the processing quality and avoids unexpected accidents 67. Avoid long hair winding in the rotating parts 68. There is an operating device on the punch that requires the left and right hands to press the button at the same time to allow the punch to fall 69.B 70.A 71.A 72.A 73. C 74.B 75.A 76.B 77.B 78.B 79. Value-added tax, consumption tax, business tax 80. Copyright law, patent law, trademark law and anti-unfair competition law 81. Novelty, creativity and practicality 82.D 83. The board of directors believes When necessary