Fill in the blanks:
Q235AF indicates that the yield strength is? MPa steel, f?
What is the maximum physical size of a hole? What is the size of the shaft?
What are the common surface treatment processes?
Metal corrosion point? And then what? Two types
? And then what? In some cases, the connecting nut may loosen gradually.
What are the basic phases in annealed, normalized and quenched and tempered carbon steels? And then what?
Short answer calculation: flat belt open transmission problem, know the diameter, center distance and bandwidth of driving wheel and driven wheel, find the transmission ratio, check the wrapping angle and belt length;
Rubber-covered shoes produce static electricity, capacitance and charge, so as to find the accumulated voltage of human body and the method to reduce the accumulation of static electricity.
The front view and the top view of the drawing problem are exactly the same, both are squares, and a diagonal line is used to supplement the left view and the right view.
Additional questions (no score):
Describe the operation steps of a chart (a simple frustum) with your familiar three-dimensional software;
Analysis steps of general finite element analysis software;
Summarize the attitude and quality of mechanical and electrical engineers in 20 words.
Mechanical designers write test questions
1. Fill in the blank: (1.5x20 = 30 points)
1. The working modes of the cylinder are: _ _ _ _ _ _ _.
2.60 ordinary thread locking connection effective thread number is _ _ _ _ _ _.
3, 45 steel carbon content is about _ _ _ _ _ _.
4, the machine tool gradually eliminated in modern machining is _ _ _ _.
5, the development trend of modern machining is _ _ _ _ _.
6.EDM means _ _ _ _ _ in Chinese.
7.CNC means _ _ _ _ _ _ _ in Chinese.
8, the role of the fixture is _ _ _ _ _.
9. Bearings can be divided into _ _ _ _ _ by friction.
10, and the commonly used heat treatment methods are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
(Please answer at least 4 kinds)
1 1. The output power of the motor is directly proportional to _ _ _ _ _ _ _ _.
12, the commonly used welding method is _ _ _ _ _ _ _ _ _ _ _ _. (Answer at least 3 kinds)
13. When the flange and the pipe body are welded, the stress groove should be opened in _ _ _ _ _ _ _ _ to reduce the welding deformation.
Weldability of 14 and 45# steel when welded with1Cr18ni9Ti _ _ _ _ _ _ _.
15. Common casting defects are: _ _ _ _ _ _ _ _ _ _.
16. According to the coating material, the common electroplating methods can be divided into _ _ _ _ _ _.
17. After the sheet metal is bent, _ _ _ _ _ _ _ _ will appear near the bending position, which will affect the subsequent processing procedures.
18, the role of cutting fluid in metal cutting process is: _ _ _ _ _ _ _ _; The metal material that does not contain cutting fluid when cutting is _ _ _ _ _.
19. In Cartesian coordinate system, the directions pointed by the thumb, forefinger and middle finger of the right hand respectively represent _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
20. The three commonly used mechanical transmission mechanisms are _ _ _ _ _ _ _ _.
2. Short answer questions: (20 points)
The reason why gear reduction mechanism can't be completely replaced by electronic speed regulation mechanism.
A:
Third, the process analysis question: (50 points) omitted.
The following are the answers to some questions, others need your help: 3, 0.45%.
5. Automation
6. MasterofEducation.
7, computer numerical control
8. Clamping, positioning, ensuring accuracy and improving processing efficiency.
9. Rolling friction. sliding friction
10, quenching, tempering, normalizing, tempering and annealing.
1 1, frequency
12, CO2, argon arc welding, laser welding
After finishing the experiment in the afternoon, I accompanied my classmates to the written test in Osram, but I bumped into the written test myself. There are three positions, namely financial management, research and development, and mechanical engineer. The company didn't give lectures, so I handed out papers directly and still did mechanical problems.
The first problem is drawing. Give a front view and a left view. Please draw a top view.
The second problem is the modification of bolt connection.
The third problem is the understanding of form and position tolerance.
The fourth question is, thread (left-handed, right-handed? ), what does G 1/A 1 mean?
The fifth question is how to input AUTOCAD radian, plus sign or minus sign ... glow, etc. (%%D，%%P，，%%C)
Sixth, AUTOCAD shortcut keys for drawing circles, lines, arcs, moving, copying,,, and commands.
Finally, ask the relationship between roundness and stress concentration.
It's all professional knowledge There are no English questions this time. The papers for other positions are all English questions.
Chang 'an Ford written test for mechanical specialty.
I took part in this competition, and all the first choices were Changan Ford Mazda Assembly. Not only this major, I also saw the male compatriots of Dongda Machinery. I chatted with people around the waiting area, including accountants from Nantah, masters from Heather University and Nancai University ... I didn't want it early when I was far away, so I bought a car magazine at the newsstand because there happened to be an article about Ford Focus in it. Facts have proved that this magazine is of little use.
The content of the written test is divided into two parts. The first part is logical reasoning, mainly graphic reasoning and graphic induction. The second part is English writing, which is an open article to express opinions. The topic is not difficult. Reasoning is easy, but induction is difficult, mainly because all the graphics are disrupted. We need to find the same rules between pairs, and then pick out those that don't conform to the rules, and most of the figures are very complicated. It can be seen that quite a lot of graphics at that time were hand-animated The logical reasoning part consists of 30 questions, which takes less than 20 minutes. Fortunately, I prepared some similar questions before, and I finished them first. I'm sure questions 23-26 are correct. Many people completed 2/3 to 3/4, followed by random selection.
The second part is the paper issued after the first part, which is writing, 15 minutes. My topic is about compulsory courses and elective courses offered by universities. Which major should I ask? The time for thinking is also within 15 minutes, but fortunately, I haven't made a draft of the exam composition before. Although I felt that some parts didn't write enough arguments when I finished writing, I personally felt that the thinking was very clear. Finally, Ford was merged, and by the way, I hinted what would happen if I could enter the interview stage ... not bad ~ at least more than enough compared with the boys in Dongda University.
It can be said that Mindray's writing test is enough to brainwash me and give me a slap in the face for my previous muddled professional review. Mindray's written test is extensive, but it is the most basic knowledge. Now let's talk about the topic in detail (just by memory):
1, the first one is about the choice of five fill-in-the-blank questions, as well as tolerance, benchmark (roundness, verticality, parallelism, etc. ), metal processing heat treatment, and engineering drawing of bolts;
2, followed by a mechanical drawing topic, giving a front view, a left view and a sectional view, asking for a top view. The parts are not complicated, but I haven't looked at the picture for a long time and haven't drawn it. Many basic knowledge have been forgotten. anxious ...
3. Technological calculation of dimension chain. It is the most basic calculation problem of interchangeability to give the matching requirements and tolerances and calculate whether the matching meets the requirements.
4. The problem of dimensioning. The topic first gives the functional background of the part, and then marks the dimensions on the drawn part drawing, including tolerance, shape and position tolerance, roughness and so on.
5. Mechanics of materials. According to the given pole stress, calculate the axial force, shear force and bending moment of the pole, and draw the corresponding schematic diagram (with the calculation process attached). This is very common in the shaft design of material mechanics and mechanical design, and the calculation is not complicated, see if you can;
6.Pro/E topic. This topic is not well understood, and it is the basic problem of graphics or CAD technology. Surfaces composed of three curves and surfaces composed of four curves are not test operations.
7. Give a part drawing (like a bearing seat) and talk about its processing technology.
8. Q&A: Please name two important indexes of precision transmission system and define them.
Additional question: testing finite element knowledge;
(1) Tell the definition of finite element, commonly used finite element software, etc.
(2) Given the stress of a bar, the constraint conditions are stated according to the finite element principle.
1 dimension line, dimension boundary line, thread bottom line and gear line are all drawn with (thin solid line).
2 When the first perspective projection method is used to represent the workpiece view, the back view is at the end (right side) of the left view.
The section line of metal material is generally a parallel line with an angle of 45 degrees with the horizontal direction, but when the main contour line makes an angle of 45 degrees with the horizontal direction, it can be drawn as a parallel line with an angle of 30 degrees or 45 degrees with the horizontal direction.
4 Dimensional tolerance refers to (allowable dimensional variation).
In metals and alloys, it is mainly (metal bond), but sometimes it is mixed with other bonds to varying degrees.
As long as the crystal has a certain melting point, another characteristic is (anisotropy).
7 In the phase diagram of Fe-C alloy, the precipitation transition temperature is (727℃).
8 Carbon content () is cast iron.
The microstructure of carbon steel after quenching and tempering treatment should be (sorbite).
Tempering correction method is the most effective method for deformation of 10 high speed steel thin plate milling cutter after quenching.
1 1 Geothermal defects and banded structures such as widmanstatten structure and coarse grains in castings, forgings, rolled pieces and weldments of carbon structural steel can be eliminated by normalizing.
12 38CrMoAl steel boring bar usually adopts (nitriding) chemical heat treatment.
13 automobile transmission gears are generally chemically treated (carburized).
The strength of 14 carbon nanotubes is (100) times that of steel.
The purpose of 15 optical fiber is to transmit energy.
16 The cemented carbide that can be processed, forged, welded and heat treated is (steel bonded cemented carbide).
17 engineering plastics (ABS plastics) with strong quality, toughness and high rigidity are finally used in steering wheels of automobiles, decorative plates, sound insulation boards and window frames in aircraft cabins.
18 the spark plug of internal combustion engine is made of (alumina) ceramic material.
19 chemical pipeline pumps and other parts that require corrosion resistance and aging resistance can be made of engineering plastics.
Solid materials refer to (metal materials, ceramic materials and polymer materials).
2 1 the most traditional and accurate method to determine the chemical composition of metal materials is (chemical analysis).
The hardness of metal materials with coarse grains or constituent phases such as gray cast iron and bearing alloy, and the hardness of steel parts after annealing, normalizing and quenching and tempering are mostly measured by Brinell hardness tester.
The bed is usually made of (gray cast iron).
There are three isothermal transformation lines in the iron-carbon phase diagram (peritectic transformation, * * * precipitation transformation and * * * crystallization transformation).
The hardening ability of 25 steel depends on (carbon content).
The temperature of quenching oil tank is generally controlled below 80℃.
Beryllium bronze can be strengthened by solution aging.
In order to avoid and reduce the oxidation and deoxidation of steel parts during heat treatment, it is best to use (vacuum furnace).
Isothermal quenching is commonly used to strengthen and toughen 30 65Mn steel spring parts.
3 1 The surface of machine tool guide rail is finally quenched by heat treatment (ultrasonic quenching).
When the drawing die is made of ductile iron, chemical heat treatment (carbonitriding) is needed after normalizing and tempering.
Chaotic ripple appears when machining excircles and holes on lathe 34, which is due to the large axial movement of lathe spindle.
Which of the following workpieces (flat workpieces that are not easy to clamp) is more suitable for forward milling?
Which factor is most likely to cause surface burn (grinding wheel is too hard) in cylindrical grinding?
37 (Partial Interchange) Assembly Method Assembly dimensions should be solved by probability method.
In order to ensure the coaxiality accuracy between the center height of machine tool spindle and the center height of tailstock, which assembly method (repair assembly method) should be selected.
When the spindle of the machine tool is running, there is obvious temperature rise in the support part of the spindle, which shows that the working clearance of the rolling bearing supported by it is too small.
Generally, the cutting speed is expressed in (m/min), while the WEDM speed is expressed in (mm2/min).
4 1 The minimum wall thickness of castings produced by different materials and different casting methods is different. When casting gray iron castings with sand mold, the minimum wall thickness can reach (3 mm).
When the minimum wall thickness of aluminum alloy is 0.6-0.8mm, casting (die casting) should be adopted.
Different pressure working methods make the internal force of metal different, so the processed metal will produce (the same) ductility.
The specific gravity of 45 forgings is not expressed by the volume ratio of the workpiece before and after deformation.
Free forging can be divided into manual forging and machine forging. At present, mechanical forging is the most widely used, and the shape and size of the forgings produced are mainly determined by the technical level of the operators.
Most of the raw materials used in stamping process belong to metal materials with good plasticity, such as ordinary low carbon steel, copper and aluminum alloy.
Three welding methods refer to (fusion welding, pressure welding and brazing)
Welding method is dominant in welding production.
The welding arc consists of cathode region, anode region and (arc column region).
The welding arc temperature of 5 1 can reach (5000 K-30000 K).
52 During welding, every 5 minutes, 2 minutes are used to replace covered electrode and clean slag, and the continuous load rate of power supply is (60%).
Cathodic electrophoretic coating is widely used in automobile body.
Convective radiation is the most widely used coating drying method in automobile industry.
57 The best choice for spraying pure molybdenum layer is ().
The best choice of 58 long-term anticorrosive zinc-aluminum coating is ().
59 at present, the industry with the most spraying technology is ().
Galvanized steel plate, galvanized steel plate, steel strip, galvanized iron wire, etc. Are produced by () production method.
6 1 is the most widely used () process, accounting for more than 60% of the total electroplating.
The protective layer of the plate used in the canning industry is ().
63. Used for engine cylinder inner wall, piston ring and other parts of electroplating is ().
The quality of EDM is related to the selection of pulse power supply parameters. Which parameter should be adjusted to improve machining efficiency? How to adjust it?
65 metal surface laser heat treatment, commonly used is () laser? Why?
The purpose of 66 equipment preventive maintenance is ().
When women enter the production and processing workshop, they usually require to wear hats. The reason is ().
In order to prevent the punch from breaking fingers, the common safety protection measure in the operating device of the punch body is ().
69 when operating on electric equipment that is easy to get an electric shock, the most important measure to prevent electric shock is ().
A grounding and zero connection of electrical equipment with rubber gloves.
Do not touch the uncharged conductive parts of electrical equipment. D the periphery of electrical equipment is protected by metal barrier.
In industrial production, due to the transformation of energy and resources, waste water, waste gas, waste residue, waste heat and radioactive substances are discharged in the production process, thus polluting the atmosphere, water body and soil; Or noise, vibration, electromagnetic radiation and other hazards to the surrounding environment, places, equipment and devices that can produce these harmful effects are usually called ().
A industrial pollution source B industrial pollutants C polluting enterprises D industrial waste
7 1 The main pollutant in industrial waste gas is ().
A kind of sulfur dioxide, particulate matter, carbon monoxide, carbon dioxide and stupid organic matter.
B sulfur dioxide, particulate matter, carbon monoxide and ozone.
C sulfur dioxide, carbon dioxide, carbon monoxide, ozone
Sulfur dioxide, sulfur monoxide, carbon monoxide, carbon dioxide
The main pollutant in 72 industrial wastewater is ().
Heavy metals, organic matter, suspended solids, radioactive substances, chromaticity, ammonia, nitrogen, phosphorus and oils.
Microorganisms of heavy metals and calcium carbide
Bacteria, suspended solids and radioactive substances
D. calcium carbide, heavy metals, bacteria and radioactive substances
In the law of People's Republic of China (PRC) on the prevention and control of environmental pollution by solid waste, the principle of "three-oriented" governance adopted by the state for the prevention and control of environmental pollution by solid waste is ().
Landfill, covering and harmlessness;
B. the principles of complete reduction, complete resource utilization and complete harmlessness.
C reduction, recycling and harmlessness, that is, the principle of reducing the generation of solid waste, making full and rational use of fixed waste and disposing of solid waste harmlessly is implemented.
D reduction, recycling and harmlessness, that is, the principle of reducing the generation of landfill leachate, making full and reasonable use of leachate and treating leachate harmlessly.
74 China's "basic moral standards for citizens" is ().
First, patriotism, law-abiding, integrity, unity and mutual assistance, hard work and plain living, loyalty to their duties.
B. Be patriotic and law-abiding, humble and honest, united and friendly, diligent and self-reliant, dedicated and dedicated.
Patriotism and law-abiding, modesty and prudence, unity and cooperation, diligence and self-improvement.
D patriotism and law-abiding, honesty and justice, mutual respect and love, diligence and self-improvement, love and dedication.
China's "Implementation Outline of Civic Morality Construction" puts forward the basic content of professional ethics ().
A: I love my job, be honest and trustworthy, be fair, serve the masses and contribute to society.
B. Be dedicated, honest and trustworthy, fair and just, warm and thoughtful, and selfless.
C love their jobs, honest and trustworthy, fair and reasonable, hard work, selfless dedication.
D, love their jobs, be honest and trustworthy, be reasonable and legal, be diligent and dedicated, and contribute to society.
76. The Accounting Law stipulates that () is in charge of accounting work in the whole country.
A the State Council B the State Council Ministry of Finance C People's Republic of China (PRC) State Taxation Administration of The People's Republic of China D State Commission for Discipline Inspection
77 () is usually called "the three financial statements".
Balance sheet, profit distribution table, accounts receivable and accounts payable table
Balance sheet, income statement and cash flow statement
Balance sheet, cash flow statement and balance sheet
Balance sheet, profit distribution statement and financial audit report
78. "Enterprise Accounting System" brings () into the accounting system for the first time, thus ensuring that accounting information is consistent with objective economic facts.
A historical cost principle b is more important than formal principle c prudence principle d objectivity principle.
79. China's current turnover tax categories include ().
China has not formulated a unified intellectual property law, but has formulated different separate laws, regulations and rules according to different types of intellectual property rights, thus forming a legal system of intellectual property rights in China. These individual laws are ().
8 1 China's patent law stipulates that the prerequisite for granting the patent right for inventions and utility models is ().
After all the capital contributions of shareholders of a limited liability company have been verified by a statutory capital verification institution, () shall apply to the company registration authority for registration of establishment.
A shareholder with the largest capital contribution B all shareholders C chairman D representatives designated by all shareholders or agents entrusted by * * *.
A joint stock limited company may not convene an extraordinary shareholders' meeting in the case of ().
A: The answer is as follows: 1. Thin solid line 2. Right 3. The main contour line is 45 degrees to the horizontal direction 4. Allowable size variation 5. Metal key 6. The anisotropy is 7.727℃ 8.2. 1 1% 9. Sorbite 10. Tempering correction method 65438. 3. Carburizing 14. 100 15. Transmission energy 16. Steel bonded cemented carbide 17. ABS plastic 18. Alumina 19. PTFE 20。 Metal material, ceramic material and polymer material 2 1. * * * Precipitation transformation * * Crystal transformation 25. The carbon content of steel is 26.80℃ 27. Solution aging 28. Vacuum furnace 29. Oxygen-sulfur-carbon-nitrogen-boron permeation 30. Isothermal quenching 3 1. Ultrasonic quenching. Cr-Nb infiltration 33. Nitrogen-carbon infiltration 34. The spindle of the lathe moves axially. 35. Flat workpieces that are not easy 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 increased by 40. m/minmm2/min41.3mm 42.1.15:1.1:1.43. Die casting 44. It is also 45. The volume ratio is 46. Technical level of operators. Plasticity 48. Fusion welding, brazing and pressure welding. Welding 50. 0% 55. Cathodic electrophoresis 56. Convective radiation 57. Flame spraying 58. Arc spraying 59. Aeroengine 60. Continuous electroplating of 6 1. Galvanized 62. Tin plating 63. Chrome plated 64. At the same time, the peak current of discharge time increases by 65. Carbon dioxide has a high energy. The service life of the equipment is prolonged, the processing quality is guaranteed, and accidents are avoided. Preventing long hair from winding around the rotating member 68. Punching machine An operating device that can only fall when the left and right hands press the button to punch holes at the same time 69.b70.a71.a72.a73.c74.b75.a76.b77.b78.b79. VAT consumption tax business tax 80. Copyright law, patent law, trademark law, anti-unfair competition law 8/kloc-0. Novelty, creativity and practicality