One: What types of fixtures are used according to their purpose?
Answer: (1) Universal fixture (2) Assembly formwork
Two: Which types of samples are checked?
Answer: (1) inner template (2) outer template (3) three-dimensional model
Three: What are the common defects of cold-worked components?
Answer: (1) dimensional error (2) shape error (3) surface defect
Four: What kinds of stress tests?
Answer: (1) Hydraulic test (2) Air pressure test
Five: What are the common methods of non-destructive testing?
Answer: (1) Radiographic inspection (2) Ultrasonic inspection (3) Magnetic particle inspection (4) Penetration inspection
Six: What are the three elements of strength?
Answer: (1) the size of the force (2) the direction of the force (3) the point of force
Seven: What rules should be met when the two lines of force do not line up on a straight line?
A: The triangle rule.
Eight: What are the common constraints in engineering?
Answer: (1) soft body constraint (2) smooth surface constraint (3) hinge constraint (4) fixed end constraint
Nine: What are the four basic variants of components in engineering?
Answer: (1) Tensile deformation (2) Shear deformation (3) Torsional deformation (4) Bending deformation
Ten: What is the gear ratio estimation formula for the belt drive?
A: i=n/N=D/d
Eleven: What are the main types of threaded connections?
Answer: (1) bolted connection (2) double stud connection (3) screw connection
Twelve: What are the main functions of the pin connection?
Answer: (1) Positioning (2) Transfer load
Thirteen: What are the main components of rolling bearings?
Answer: (1) inner ring (2) outer ring (3) cage (4) rolling element
Fourteen: What are the characteristics of a crystal diode?
Answer: (1) forward conduction (2) reverse cutoff (3) reverse breakdown
Fifteen: What are the four control tasks of the CNC gas cutting machine after each step of the torch?
Answer: (1) Deviation judgment (2) Torch feed (3) Deviation calculation (4) End point judgment
Sixteen: What method does the plasma arc cut use to compress the arc into a plasma arc?
Answer: (1) mechanical compression (2) thermal compression (3) electromagnetic compression
Seventeen: What is the actual shape of the section when the cone is cut in a plane parallel to the axis of the cone?
A: Hyperbolic.
Eighteen: What are the inherent defects in common welds?
Answer: (1) stomata (2) slag inclusion
Nineteen: What are the common surface defects of welds?
Answer: (1) Unfused (2) Undercut
Twenty: What is the transmission mode that can guarantee the stability of the instantaneous transmission ratio?
A: Gear drive.
Twenty-one: What is the transmission method that can obtain a larger gear ratio?
A: Gear drive.
Twenty-two: What is the sum of basic time and auxiliary time?
A: Working hours.
Twenty-three: What are the general principles of mold design?
A: Under the premise of ensuring the quality of stamping parts, we strive to design the molds with ease, simple process, low cost, convenient use and a certain service life.
Twenty-four: What issues should be noted when formulating process specifications?
Answer: (1) technological advancement (2) economic rationality (3) good and safe working conditions
Twenty-five: What is nondestructive testing?
A: When testing materials and internal defects in products, various non-destructive methods are collectively referred to as non-destructive testing.
Twenty-six: What are the main uses of the train?
Answer: (1) can obtain a larger transmission ratio (2) can obtain a larger center distance (3) can be changed speed (4) can be changed direction (5) can be decomposed or synthetic motion
Twenty-seven: According to the load on the shaft, what kind of axis can be divided into?
A: Mandrel, shaft, drive shaft.
Twenty-eight: What welding should be used for welding stainless steel sheet?
A: TIG welding.
Twenty-nine: What are the three basic components of the cam mechanism?
A: Cam, follower, rack.
Thirty: What are the methods of the compactness test?
A: Air tightness test, kerosene penetration test, ammonia penetration test.
Thirty-one: What is the calculation basis for the length of the angle steel?
A: The center of gravity.
Thirty-two: What is the position of the neutral layer when the steel plate is bent?
A: The ratio of relative bending radius r/s.
Thirty-three: What method is usually used to form the head?
A: Calendering.
Thirty-four: What are the three-phase asynchronous motors that can be divided into rotor structures?
A: Wire-wound, cage type.
Thirty-five: What are the main functions of springs?
Answer: (1) buffering and vibration absorption (2) controlling motion (3) storing energy (4) measuring force and moment.
Thirty-six: What are the means of material performance inspection?
Answer: (1) chemical composition analysis (2) spectral analysis (3) strength performance test (4) metallography (5)
Intergranular corrosion tendency test.
Thirty-seven: A table tennis surface can be similarly unfolded. What is the method for its expansion?
A: The split deployment method,
Thirty-eight: What is the equivalent of 1kgf?
A: 9.8N.
Thirty-nine: What is the sign of normal stress?
answer:&
Forty: What should be done to check the tightness of the container containing flammable and explosive materials?
A: The air tightness test.
Forty-one: The cylinder is cut by the plane, and the intersection line is parallel two straight lines. What about the section plane and the cylinder state line?
A: Parallel.
Forty-two: What kind of workpiece is used for electroslag welding?
A: Thick-walled workpieces.
Forty-three: What method is used to check the surface crack of the workpiece?
A: Magnetic particle inspection.
Forty-four: What is the selection surface for selecting a datum to support the assembled metal structural part?
A: Support
Forty-five: What methods are commonly used in the manufacture of large and complex structural parts?
A: The component assembly method.
Forty-six: What are the two basic conditions for assembly operations?
Answer: 1: Positioning, 2: Benchmark.
Forty-seven: What heat treatment should be used to eliminate the internal stress generated during welding?
A: Annealing.
Forty-eighth: What should be included in the inspection of cold work products?
Answer: 1: Quality inspection of raw materials, 2: raw material parts, geometrical inspection of products, 3: material performance inspection, 4: non-destructive testing, 5: pressure test, 6: compactness test.
Forty-nine: What are the original materials that must be available when preparing the process specifications?
Answer: 1: The whole working diagram of the product, 2: The quality standard of the product inspection, 3: The production program and production type of the product, 4: The production of the blank, 5: The production conditions of the factory, the development of the domestic and foreign production technology .
Fifty: What line is the break of the partial view?
A: It is indicated by a wavy line.
Fifty-one: Under what circumstances does the metal material have high forming precision?
Answer: The shear strength is low, the plasticity is good, the structure is uniform, and the notch sensitivity is low.
Fifty-two: What are the three surfaces formed during overcutting?
A: They are: (1) the surface to be processed. (2) machined surface, (3) unmachined surface.
Fifty-three: The working part of the twist drill consists of several parts?
A: It consists of a guiding part and a cutting part.
Fifty-four: What is the main reason for pipe cracking?
A: The clamping force is too large.
Fifty-five: What is the main reason for the ellipse in the cross section of the elbow when the pipe is mechanically bent?
A: The amount of reverse bending is insufficient.
Fifty-six: When the steel drum is used, what is the length of the blank?
A: Calculated according to the neutral layer of the steel plate.
Fifty-seven: What is expansion?
Answer: The expansion joint uses the expander to plastically deform the tube. At the same time, the wall of the tube plate is elastically deformed. The springback is applied to the tube by the rebound of the tube wall to make a permanent connection.
58: What should be done to prevent welding cracks in alloy steel welding?
Answer: Before welding, the weldment should be heated to a certain temperature before welding.
Fifty-nine: Under what circumstances can the assembly gauge be used?
A: It is necessary to carry out tests frequently to ensure accuracy, work, clamps, and tires to be inspected before use.
Sixty: What is the main reason for the cone defect in the workpiece when the sheet is rounded?
Answer: The upper shaft and the side shaft of the bending machine are not parallel.
Sixty-one: What is the intersecting line?
A: The intersection of two or more intersecting surfaces.
Sixty-two: Under what circumstances in the actual operation process, the machining allowance for the workpiece is estimated?
A: The estimation method is used for single piece and small batch production conditions.
Sixty-three: The strength of the riveting is generally proportional to the rivet?
A: It is proportional to the diameter and number of rivets.
Sixty-four: What types of structural types are there inflated?
Answer: Generally, there are optical hole expansion joints, flange expansion joints, slot expansion joints and expansion joints and face welding.
Sixty-five: The magnitude of the welding current should be determined according to what factors?
A: According to the type of welding rod, the diameter of the welding rod, the thickness of the weldment, the form of the joint, the position of the weld, the level of the weld bead, etc.
Sixty-six: What should be considered in the assembly of welded parts with high technical requirements?
Answer: Assembly clearance, welding shrinkage.
Sixty-seven: What is the diameter of the electrode selected according to the welding?
A: Weld thickness, joint form, weld position, weld bead level.
Sixty-eight: What are the two major categories of manual arc welding machines?
A: AC arc welder and DC arc welder are two major categories.
Sixty-nine: What are the common defects of elbows?
A: There are: bulging, flattening, folding, ellipse, bending and so on.
Seventy: What are the common shape defects when the sheet is rolled?
A: Conical, waist drum, waist, skew,
Seventy-one: What methods can be used to bend the steel?
A: Rolling, bending, and bending.
Seventy-two: What are the methods of bending?
A: Press (top) bend, roll, bend back, bend.
Seventy-three: What types of welding rods are classified according to their slag characteristics after their coatings are melted?
A: It is divided into two categories: acid electrode and alkaline electrode.
Seventy-four: What are the benchmarks for plane graphics in several directions?
A: There are benchmarks in both horizontal and vertical directions.
Seventy-five: What are the basic views?
A: divided into main view, rear view, top view, bottom view, left view and right view.
Seventy-six: What are the two categories of size benchmarks that can be classified according to their nature?
A: It can be divided into two categories: design basis and process benchmark.
Seventy-seven: How can the expression of cold-working structure map be divided into several types?
A: It can be divided into three types: structure diagram, simple structure diagram and complex structure diagram.
Seventy-eight: What is the weldability of metal materials?
A: It is determined by physical and chemical solderability and process solderability.
Seventy-nine: Which movements does the cutting motion consist of?
A: It consists of the main movement and the feed movement.
Eighty: What are the cutting elements when cutting metal?
A: Yes: cutting speed, feed rate, depth of cut.
Eighty-one: What metal material is made of twist drill?
A: It consists of high speed steel.
Eighty-two: What are the two machining allowances?
A: There are two kinds of process margin and total margin.
Eighty-three: What parts of the electrical control circuit usually consist of?
Answer: It consists of lighting circuit, control circuit, signal circuit and other lighting circuits.
Eighty-four: What is a hydraulic circuit?
A: A typical circuit that consists of hydraulic components and performs a specific function.
Eighty-five: What are the mechanical precision of the parts?
A: There are dimensional accuracy, shape accuracy, and positional accuracy.
Eighty-six: What is a low-voltage electrical appliance?
A: The electrical appliances that work under 1000V are low-voltage electrical appliances.
Eighty-seven: What is the coil?
Answer: It is a plastic deformation process of continuous bending of the sheet material by the coiling machine.
Eighty-eighth: What are the main reasons for residual stress and deformation after welding of steel structures?
Answer: The steel structural parts are partially heated and cooled, and the metal heat expansion and contraction in the high temperature area is hindered by the surrounding cold metal.
Eighty-nine: What is the production technology preparation process?
A: All production technology preparations are carried out before the product is put into production.
Ninety: What are the methods for rolling the steel cone?
A: There are small mouth deceleration method, two-speed rewinding method, rotary feeding method, rectangular feeding method, and rolling method.
Ninety-one: What are the defects on the cylindrical surface of the steel plate?
A: There are (1) shape defects (2) surface crush (3) curling.
Ninety-two: What are the methods for sheet pre-bending?
Answer: (1) Manually hammering the pre-bend (2) Pressure mechanical mold or general mold pre-bend (3) The template or pad for the coiling machine, and the wedge-shaped pad for pre-bending.
Ninety-three: What are the measures to improve the bending radius of the machine and the thin-walled steel pipe elbow?
Answer: There are (1) using the curved chute or roller (2) using the inner sidewall padding method (3) using the pipe bending machine with slow cornering speed (4) using the top pipe bending machine.
94: Briefly describe the principle of flame correction?
Answer: Flame correction is to use the flame to heat the convex part of the deforming member, so that the heating and expansion of the convex metal is blocked and generate compressive stress. When the compressive stress exceeds the yield point of the heated metal, the metal fiber of the convex part is plastically deformed, thereby achieving the purpose of correction. .
Ninety-five: What is three views?
A: Often referred to as the main view, top view, the left view three basic views are three views.
Ninety six: What are the three elements of the riveting assembly?
A: It is support, positioning, and clamping.
Ninety seven: What is correction?
Answer: Correction is to plastically deform the steel under the action of external force, so that the fiber partially contracted by the steel is elongated, the elongated fiber is shortened, and the fiber length of the metal part is uniform to eliminate the defects of surface unevenness, bending, twisting and wave deformation. To get the correct shape.
Ninety-eighth: What is the principle of triangle expansion?
A: The principle is to divide the surface of the part into a group or a group of triangles, then find the real length of each side of each group of triangles, and draw their shapes on the plane in order to get the expanded picture.
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