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Classification And Function Of Reinforcement Mesh
Classification And Function Of Reinforcement Mesh
2022-01-19
What Are The Inspection Standards For Steel Bar
What is the inspection standard for reinforcement
2022-01-19

Gear steel and gear materials and applications

1、Gear steel and gears are steels that can be used for processing and manufacturing gears
Any steel that can be used to process gears can be called gear steel. As gears rely on their own structural dimensions and material strength to withstand external loads, the steel used to manufacture gears is required to have high strength, hardness, toughness, wear resistance and manufacturability.
With the development of science and technology, is towards high performance, long life, smooth running gears, low noise, safety, low cost, easy processing, multi-species direction.
2、Performance indicators
 In terms of performance indicators, the main criteria for measuring the performance of gear steel are three.
(1). Hardenability
Mainly to ensure the hardness of the heart of different sizes of gears, conducive to the control of heat treatment deformation of gears. Its performance mainly depends on the chemical composition and its uniformity.

Materials And Applications Of Gear Steel And Gears
  • (2).Oxygen content
  • Oxide and sulfide inclusions and harmful elements will reduce the mechanical properties of the steel and affect the service life of the gear. Therefore, the oxygen content of general gear steel is required to be controlled at 20 × Below 10-6.
  • (3). Grain size
  • The grain size index can improve the fatigue performance of gear and reduce the deformation of gear after heat treatment. Generally, the grain size of gear steel is required to be ≥ grade 6, mainly by controlling the residual aluminum content in the steel during smelting.
  • 3、 What are the Gear Steel And Gears materials
  • The commonly used materials of gear steel include forged steel and cast steel. Cast steel is generally used to manufacture gear with diameter greater than 400mm, complex structure and unsuitable for forging. Other conditions are more suitable for forged steel. The forged steel used is also different according to the hardness of tooth surface:
  • (1). Soft tooth surface
  • The hardness of tooth surface less than 350mm is called soft tooth surface. The commonly used gear steels for soft tooth surface include 45# steel, 35SiMn, 40Cr, 40crni and 40MnB.
  • (2). Hard tooth surface
  • Gear surface with hardness greater than 350mm is called hard gear surface.
  • Gear steel used for hard gear surface can be divided into medium carbon steel and low carbon steel. Medium carbon steel includes 35# steel, 45# steel, 40Cr, 40crni, 42CrMo, 35CrMo, etc., and low carbon steel includes 20Cr, 20CrMnTi, 20mnb, 20crmnto, etc.

Gear Steel And Gears

Principle of gear

  • Gear is a kind of power transmission parts. Through the meshing of gears with the same module, the power is transmitted from shaft a to shaft B to complete the power transmission.
  • Gear transmission has the advantages of high transmission precision, wide application range, high transmission efficiency and long service life.
Materials And Applications Of Gear Steel And Gears

Function of gear

  • The main function of gears is to transmit power. In addition to being used as production parts of watches and alarm clocks, gears also have great applications in the field of heavy industrial manufacturing.

Type and name of gear

Classification of gears according to their axial characteristics
1, parallel axis gears: spur gears, helical gears, internal gears, rack and pinion gears, etc.
2、Intersecting axis gears: spur gears, spiral bevel gears, zero teeth, bevel gears, conical gears, etc.
3、Intersecting shaft gears: intersecting shaft helical gears, worm gears, hypoid gears, etc.
4、Special axis gears: planar gears, harmonic gears, cycloidal gears, etc.

According to the material classification of gear steel and gears

Gear Steel And Gears
  • 1. Metal gears: forged steel gears, cast steel gears, cast iron gears, etc.
  • 2. Non metallic gears: Nylon gears, cloth gears, wooden gears, plastic gears, etc.

What are the basic parameters of gears

  • Number of teeth Z: the number of teeth refers to the total number of teeth of a gear.
  • Modulus M: modulus refers to the ratio of pitch P and PI between the tooth profiles on the same side of two adjacent gears. The larger the modulus of gears with the same number of teeth, the larger the size.
  • Indexing circle diameter D: the indexing circle diameter refers to the circle whose diameter is the product of modulus multiplied by the number of teeth. The tooth size of gear is determined based on this circle.
  • pressure angle α： At the tangent point P of the two gear pitch circles, the acute angle between the common normal of the two tooth profile curves and the common tangent of the two pitch circles is called the pressure angle, also known as the meshing angle.
  • Tooth height and tooth thickness: the height of the tooth is determined by the module M. full tooth height = tooth root height + tooth top height, where tooth top height is the height from the tooth top to the dividing line, and tooth root height is the height from the tooth root to the dividing line. The datum of tooth thickness is half of the tooth pitch.
Materials And Applications Of Gear Steel And Gears

Gear machining principle

  • 1. Forming method: use the cutting edge to cut the shape on the gear groove to be cut, and the machining accuracy is low.
  • 2. Generating method: using the envelope of the motion path of the cutting edge of the tool to cut the gear, the machining accuracy and productivity are high.

Gear processing equipment

  • Common gear processing machine tools include gear planer, gear milling machine, gear drawing machine, gear shaper, gear turning machine, bevel gear milling machine, etc.
  • Detection method of gear
  • Gear detection methods include gear single geometry error measurement technology, gear comprehensive error measurement technology, gear overall error measurement technology, gear on-machine measurement technology and gear laser measurement technology.
  • What measuring tools are needed for gear inspection
  • 1. Measuring gear indexing: tooth thickness vernier caliper, optical tooth thickness caliper and various tooth thickness chucks, etc.
  • 2. Measuring gear radial circular runout error: tooth pitch radial circular runout tester, universal tooth tester, etc.
  • 3. Measure the length of common normal line: common normal line micrometer, common normal line indicator caliper, common normal line lever micrometer, etc.
  • What are the gear inspection items
  • Accuracy of transmission motion; Stability of gear transmission; Uniformity of load distribution; Drive backlash; Motion accuracy; Motion stability and accuracy; Contact accuracy; Backlash, etc

Failure form of gear

  • The common failure forms of gears include tooth surface wear, tooth surface gluing, fatigue pitting, tooth fracture, tooth surface plastic deformation and so on.
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