99 most basic mechanical manufacturing and processing tips

1. What kinds of hammers are commonly used by riveters?

2. What kinds of chisels are commonly used in riveting?

3. What is steel?

4. What is high carbon steel?

5. Can steel be divided into several categories depending on the application?

6. Can steel be divided into several types according to its end shape?

7. What are the two basic methods for steel deformation correction?

8. What is an assembly jig?

9. What are the basic methods of cold correction?

10. What kind of heating correction?

11. What are the shapes of the local heating correction heating zone?

A: There are three kinds of shapes, lines, and triangles.

12. What kinds of angle steel deformation?

A: There are three kinds of distortion, bending and angular deformation.

13. What are the deformations of channel steel?

A: There are distortions, bends, and local deformation of the wing.

14. What is cold correction?

A: The correction performed at room temperature is called cold correction.

15. What processes are included in the separation?

A: It includes three processes of blanking, punching and cutting.

16. What is stamping?

A: The process of separating or forming a sheet to obtain a part.

17. What are the advantages of stamping?

A: The product quality is good, the productivity is high, the material is saved, the cost is reduced, and the automation is easy.

18. What is bending forming?

A: A method of bending a blank into a desired shape.

19. What are the three basic forms of riveting?

A: Docking, lapping, cornering.

20. What is riveting?

A: Use rivets to join two or more components together.

21. How many rivets are commonly used?

A: There are semi-circular heads, countersunk heads, semi-sunk heads, flat heads, flat cone heads, oblate, flat.

22. What kinds of riveting types are there?

A: There is strong riveting and close riveting.

23. What is an assembly?

A: The individual parts are combined into a component according to certain technical conditions.

24. What are the three elements of assembly?

A: Positioning, support, clamping.

25. What are the connection methods for metal structures?

A: There are welding, riveting, bolting, and rivet welding.

26. What are the commonly used tools for anti-sample?

A: powder line, stone pen, needle, ruler, sample stamping, hand hammer.

27. What are the main methods for finding the intersection line?

A: The well-defined line method, the auxiliary plane method, the spherical method.

28. What are the methods for finding the real length of a straight line segment?

A: Rotation method, right triangle method, face changing method, branch line method.

29. What are the methods for developing the map?

A: There are mapping methods and calculation methods.

30. What are the common deployment methods?

A: There are parallel line method, radiation method, triangle method.

31. What parts can the material shear section be divided into?

A: Collapse, bright belt, shear band, burr.

32. What kinds of corrections?

A: It is divided into manual correction, mechanical correction, and flame correction.

33. What is the benchmark?

A: The part line is used to determine the point line surface of other points, lines, and cotton positions.

34. What is plasticity?

Answer: The ability of metal materials to be permanently deformed without damage under external force.

35. What is resilience?

A: The ability of metal materials to not be damaged under impact loads.

36. What are the measures to prevent welding deformation?

A: Anti-deformation method, rigid fixing method, reasonable welding sequence.

37. What are the characteristics of spatial linear projection?

A: Authenticity, accumulation, contraction.

38. What is the intercept line?

A: The intersection line produced by the plane cutting of the shape.

39. What is the intersection line?

Answer: The surface intersection line produced by the intersection of two planes.

40. What are the views?

A: divided into basic view, partial view, oblique view, and rotated view.

41. What is the basic view?

A: The view from which the part is projected onto the basic projection surface.

42. What are the basic views?

A: Main view, top view, left view, right view, bottom view, rear view.

43. Which are the cross-sectional views?

Answer: It is divided into full section, half section and partial section.

44. What is the effect of cutting amount on drilling?

A: Reasonable choice of cutting amount can prevent premature wear or damage of the drill bit. Prevent machine tool overload and improve workpiece cutting accuracy and surface roughness.

45. What is tapping?

Answer: Use a tap to cut the internal thread on the hole wall.

46. ​​What is the effect of the diameter of the bottom hole on the work wire?

Answer: If the diameter of the bottom hole is the same as the diameter of the internal thread, the tap will be caught when the material expands. At this time, the tap is easy to break. If it is too large, the height of the tapped thread will be insufficient to form a waste.

47. What is ferrule?

A: Cut the thread on the outer diameter of the round rod tube with a die.

48. What are the principles to be considered when choosing a groove?

Answer: (1) Minimize the amount of weld metal filling, (2) ensure penetration and avoid cracking, (3) consider minimum welding deformation, and (4) facilitate processing.

49. What is the role of leaving the blunt edge when opening the groove?

A: Prevent the connector from burning through.

50. What are the methods for opening the slope?

Answer: It is processed by air shovel, mechanical processing, gas cutting groove, carbon arc gouging groove.

51. What is carbon arc gouging?

Answer: The high temperature of the carbon arc is used to melt the metal locally, and at the same time, the molten metal is blown off by the compressed air to achieve the purpose of planing or cutting metal.

52. What is the purpose of grinding?

A: It can eliminate the burrs on the edge of the surface of the welding surface, repair the weld seam and polish the welded joint of the pressurized container before the inspection.

53. What is bending forming?

Answer: The flat blank, profile or pipe is bent into a certain angle and curvature to form a certain shape.

54. What is the phenomenon of bombing?

Answer: The material is elastically deformed when bent. When the external force is removed, part of the elastic deformation returns to the original state, which changes the shape and angle of the curved part.

55. What are the common methods of bending forming for riveting?

A: There are bending, rolling, rolling and water-fire bending.

56. What are the factors that affect bending?

A: bending force, elastic phenomenon, minimum bending radius, sectional shape.

57. How to determine the amount of bending force?

A: According to the mechanical properties of the material being bent, the bending mode and the nature, the shape of the curved piece.

58. What are the factors that affect the bending resilience?

A: The mechanical properties of the material being bent, the relative bending radius of the material, the bending angle and some other factors. ,

59. What are the factors that affect the minimum bend radius?

A: The mechanical properties of the material being bent, the bending angle, the direction of bending of the material, the surface quality of the material and the quality of the cut section, and other factors.

60. What are the factors that influence the change in the shape of the section during bending?

A: There are mainly relative bending radii, cross-section geometry and bending method.

61. What is the effect of steel heating on the bending of steel?

Answer: The bending force required for steel heating is reduced, the rebound phenomenon disappears, and the minimum bending radius is reduced, which is beneficial to control deformation according to processing requirements.

62. Under what circumstances is heating bending used?

A: Use it at room temperature.

63. Why is the steel heating temperature limited to a certain temperature?

Answer: If the temperature is too high, the steel will be over-fired. If the temperature is too low, the molding will be difficult and cause cold hardening.

64. When using contact bending, what measures are often used to solve the problem of rebound?

A: Correct the shape of the mold, use the pressure correction method, increase the crimping device, and reduce the gap between the molds.

65. What is the bending?

A: The bending method is used to bend the mold on the press.

66. How many forms of bending deformation of materials?

A: There is free bending, contact bending, and correcting bending.

67. Why do the stampers used in riveting usually use welded structures?

A: Because it is not only easy to manufacture, it can shorten the molding cycle, and can also improve material utilization and reduce costs.

68. What is rolling?

A: The processing method of bending forming on a rolling bed.

69. What measures are often used to eliminate the straight edge of the workpiece with a symmetrical three-roller?

A: The two sides are bent and left with machining allowance.

70. Which two types of calendering can be divided into? What is commonly used for riveting?

Answer: The part is not thinned and thinned and calendered. Riveters are often used without constant thin rolling.

71. What measures should be taken when rolling the cone?

A: Adjust the position of the upper roller so that it is inclined at an angle to the lower roller; so that the feed speed of the small opening is greater than that of the large opening. Want to learn UG CNC programming plus QQ group 806540922 to help you. Receive study materials.

72. How to roll larger workpieces?

Answer: In order to avoid additional deformation caused by its own weight, the sheet material should be divided into three areas, first roll the two sides, then roll the middle, if necessary, by the crane.

73. Any rolling of non-cylindrical workpieces?

Answer: The area should be divided on the sheet according to its different radius of curvature, and the pitch of the shaft roller should be adjusted to roll.

74. What preparations are there before the workpiece is rolled?

Answer: The shaft roller and the sheet plane should be cleaned and the burrs should be removed to avoid bumping the workpiece and the shaft roller.

75. What is calendering?

Answer: The pressing process of forming a hollow hollow part through a concave die by a certain shape of the flat blank under the pressure of the punch.

76. What is water and fire bending?

Answer: The steel plate is locally heated and shrunk by an oxyacetylene flame to form.

77. What are the uses of water fire bending panels?

A: The water-fired curved plate is only suitable for forming parts with small curvature, and more is used in combination with rolling to machine parts with complex shapes with double bending.

78. What are the methods of water fire bending?

A: There is strip heating and point heating.

79. What are the processes of water and fire bending?

A: There are choices of baking nozzles, heating temperature and heating speed, cooling method.

80. How many types of water-fire bending panels are cooled?

A: There are two kinds of air and cold water, and the water is cold and has the water on the back.

81. What is air cooling?

A: After the flame is locally heated, the workpiece is naturally cooled in the air.

82. What is water cooling?

Answer: The water is forced to cool the heated part of the metal to cool it quickly, reducing the heat transfer to the back side, increasing the temperature difference between the front and back, and improving the forming effect.

83. What are the characteristics of explosive forming?

A: It can simplify the structure of the mold; it can process hollow parts with complex shapes and difficult to process rigid molds; small rebound, high precision, good quality; fast forming speed; no stamping equipment.

84. What is the corner connection?

Answer: When the two plates are connected perpendicularly to each other at an angle, the angles are used as joints at the joints to rive the workpieces together.

85. What are the main parameters of the rivet arrangement?

A: There are rivet distances, row spacing, and margins.

86. What is the rivet distance?

Answer: The distance between the two adjacent rivets in a row of rivets.

87. What is the row spacing?

A: Refers to the distance between the centers of two adjacent rows of rivet holes.

88. What is the margin?

A: Refers to the distance from the center of the outer rivet to the edge of the workpiece.

89. What is the relationship between the thickness of the component and the diameter of the rivet?

Answer: When the single row is connected with the double row, the diameter of the rivet is twice and the thickness; when the single row is connected with the double row double cover, the diameter of the rivet is 1.5~1.75.

90. What are the principles for determining plate thickness?

Answer: When lap jointing, it is determined according to the thickness of thicker sheet; when the material with large difference in thickness is riveted, it is determined by thinner sheet metal; when riveting the steel plate and profile, the average thickness of the two is taken; More than 5 times the diameter of the rivet.

91. What is the relationship between the length of the rivet and the quality of the riveting?

Answer: The rivet is too long, the rivet head is too large, and the shank is easy to bend. If the rivet is too short, the shank is not thick enough, and the nail head is incompletely formed, which affects the riveting strength and tightness.

92. How to determine the rivet aperture when cold riveting?

Answer: When cold rivet, the shank is not easy to be thick. To ensure the connection strength, the diameter of the nail hole should be close to the diameter of the shank.

93. When hot riveting, is the rivet aperture determined?

Answer: When hot rivet, the diameter of the nail hole should be slightly larger than the diameter of the shank due to the expansion of the heat.

94. What parts does the rivet consist of?

A: by hand, gun body, switch and pipe joints.

95. What are the characteristics of the rivet gun?

A: The specific product is small, easy to operate, and can be riveted in various positions.

96. Which two ways can riveting be divided?

A: It can be divided into cold riveting and hot riveting.

97. What is cold riveting?

A: It is riveting at normal temperature.

98. What is the final riveting temperature of riveting?

A: Between 450 and 600 degrees Celsius.

99. What effect does the final riveting temperature have on riveting?

A: Too high will reduce the initial stress of the shank; if it is too low, the rivet will be blue-brittle.

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