In understanding the employment situation of students, the biggest feeling is that students don't know how to express themselves, and they don't know how to express themselves. From resumes to interviews, they don't really know themselves. Next, I will bring you some common questions about mechanical interview. Welcome to reading.
Frequently asked questions in mechanical interview
1: What kinds of hammers are commonly used by riveters?
A: There are hand hammers, sledgehammers and hammers.
2. What kinds of chisels are commonly used by riveters?
Answer: There are two categories: flat chisel and narrow chisel.
3: What is steel?
Answer: Iron-carbon alloy with carbon content below 2. 1 1% is called steel.
4. What is high carbon steel?
A: Steel with carbon content greater than 0.6% is called high carbon steel.
5. According to the purpose, how many kinds of steel can be divided into?
Answer: It can be divided into structural steel, tool steel and special purpose steel.
6. According to the end face shape of steel, how many kinds of steel can it be divided into?
Answer: It can be divided into plates, pipes, profiles and wires.
7. What are the two basic methods of steel bar deformation correction?
A: There are cold correction and heat correction.
8: What is an assembly fixture?
Answer: it refers to the process equipment used to apply external force to the parts in the assembly process to make them obtain reliable positioning.
9. What are the basic methods of cold working correction?
A: There are manual correction and mechanical correction.
10: What are the types of heating correction?
Answer: It can be divided into comprehensive heating correction and local heating correction.
1 1: How many shapes can be corrected by local heating?
A: There are three kinds: point, line and triangle.
12: What kinds of angle steel deformation are there?
A: There are three kinds of distortion, bending and angular deformation.
13: What are the deformations of channel steel?
Answer: The wing plate is twisted, bent and partially deformed.
14: What is a cold correction?
A: Normal temperature correction is called cold correction.
15: What steps does the separation include?
Answer: Including blanking, punching and cutting.
16: What is a seal?
Answer: The process of separating or forming metal plates to obtain parts.
17: What are the advantages of stamping?
Answer: The product has good quality, high productivity, material saving, cost reduction and easy automation.
18: What is bending?
Answer: the processing method of bending the blank into the required shape.
19: What are the basic forms of riveting? Answer: Butt joint, lap joint and corner joint.
20: What is riveting?
Answer: Use rivets to connect two or more parts into a whole.
2 1: How many rivets are commonly used?
Answer: There are semi-circular head, countersunk head, semi-countersunk head, flat head, flat cone head, flat round head and flat round head.
22: What are the types of riveting?
A: There are strong riveting, tight riveting and tight riveting.
23: What is assembly?
Answer: All the parts are combined into one part and weighed according to certain technical conditions.
24: What are the three elements of assembly?
Answer: Positioning, supporting and clamping.
25: What are the connection methods of metal structures?
Answer: There are welding, riveting, bolt connection and riveting.
26: What are the common tools for sample prevention?
Answer: chalk line, pencil, drawing needle, ruler, sample punch, hammer.
27: What are the main methods to find the intersection line?
A: Mass method, auxiliary plane method and spherical method.
28: What are the methods to find the true length of a straight line segment?
Answer: Rotation method, right triangle method, surface changing method and branch line method.
29: What are the methods to make an expanded diagram?
A: There are drawing methods and calculation methods.
30: What are the common ways to expand?
Answer: There are parallel lines, rays and triangles.
3 1: What parts can the shear section of materials be divided into?
Answer: Corner collapse, bright band, shear band and burr.
32: What kinds of amendments are there?
Answer: There are manual correction, mechanical correction and flame correction.
33: What is a benchmark?
Answer: Points, lines and surfaces used to determine the positions of other points, lines and cotton on the part drawing.
34: What is plasticity?
Answer: The ability of metal materials to be permanently deformed without being destroyed by external force.
35; What is resilience?
Answer: The ability of metal materials not to be destroyed under impact load.
36: What measures are there to prevent welding deformation?
Answer: Anti-deformation method, rigid fixation method and reasonable welding sequence.
37: What are the characteristics of spatial linear projection? Answer: authenticity, accumulation and contraction.
38: What is the intersection line?
A: The intersection line generated by cutting the shape on a plane.
39: What is the intersection line?
Answer: The intersection line of two surfaces.
40: How many views?
Answer: There are basic view, partial view, oblique view and rotation view.
4 1: What is the basic idea?
Answer: The view obtained by projecting the machine parts onto the basic projection plane.
42: What is the basic idea?
A: Front view, top view, left view, right view, look up and look back.
43: What are the sectional views?
A: It is divided into full, half and partial segments.
44: What are the effects of cutting parameters on drilling?
A: Reasonable selection of cutting parameters can prevent premature wear or damage of the drill bit. Prevent the machine tool from being overloaded and improve the cutting accuracy and surface roughness of the workpiece.
45: What is tapping?
Answer: Cut the internal thread on the hole wall with a tap.
46: What effect does the diameter of bottom hole have on the power cord?
Answer: If the diameter of the bottom hole is the same as that of the internal thread, the tap will get stuck when the material expands, and the tap will break easily; If it is too large, the height of the tapped thread profile will be insufficient, and waste products will be formed.
47: What is a set of silk?
Answer: Cut the thread on the outer diameter of the round rod tube with the die.
48: What principles should be paid attention to when choosing grooves?
Answer: (1) Minimize the amount of weld metal filling, (2) ensure the penetration and avoid cracks, (3) consider the minimum welding deformation, and (4) facilitate processing.
49: What is the function of leaving a blunt edge when slotting?
Answer: Prevent the connector from burning through.
50: What are the slotting methods?
Answer: Machining with air shovel, machining, gas cutting groove and carbon arc gas gouging groove.
5 1: What is carbon arc gouging?
Answer: The high temperature of carbon electrode arc is used to partially melt the metal, and at the same time, the molten metal is blown off by the airflow of compressed air to achieve the purpose of planing or cutting the metal.
52: What's the use of grinding?
Answer: It can eliminate the burr on the edge of welding scar on the plate, repair and polish the weld, and polish the weld of pressure vessel before re-inspection and inspection.
53: What is bending forming?
Answer: Bend a flat blank, profile or pipe into a certain angle and curvature, thus forming a part with a certain shape. 54: A: What is the rebound phenomenon?
A: When bending, the material is elastically deformed. When the external force is removed, part of the elastic deformation returns to its original state, which changes the shape and angle of the bending part.
55: What are the common bending forming methods used by riveters?
A: There are bending, rolling bending, calendering and water-fire bending.
56; What are the factors that affect bending forming?
Answer: bending force, rebound phenomenon, minimum bending radius, cross-section shape.
57: How to determine the magnitude of bending force?
Answer: According to the mechanical properties of the material to be bent, the bending mode and nature, and the shape of the bent part.
58: What are the factors that affect bending springback?
Answer: The mechanical properties of the material to be bent, the relative bending radius of the material, the bending angle and other factors.
59: What are the factors that affect the minimum bending radius?
A: The mechanical properties of the material, bending angle, bending direction, surface quality of the material and cutting surface quality and other factors.
60: What are the factors that affect the change of section shape when bending?
Answer: There are mainly relative bending radius, geometric characteristics of cross section and bending mode.
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