Art for manufacturing Austempered Ductile iron gear for diesel engine

A kind of Aube ductile iron and manufacturing process technology, applied in the field of mechanical parts, can solve difficult problems, both in technology and equipment, poor processability of Aobei ductile iron material, complex structure and other problems, to achieve a good comprehensive Mechanical properties, good spheroidization rate, effect of reducing cutting speed

Active Publication Date: 2008-06-04
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with steel gears, the main features of Aube ductile iron gears are that they can significantly reduce gear noise and reduce gear weight (about 10%). However, the main technical difficulties in the production and application of Aobei ductile iron gears are: 1. How to ensure that High quality ductile iron gear castings
That is to ensure the chemical composition and as-cast structure required to obtain higher performance after quenching and heat treatment of ductile iron gears, especially without casting defects such as pores, shrinkage porosity, and inclusions, and gears are complex in structure and difficult to cast Parts; 2. The excellent mechanical properties of Aubey ductile iron gears are obtained through quenching heat treatment such as Aubeite. How to ensure stable production of Aubeite ductile iron gears with high performance and uniformity is difficult. Both There are process and equipment issues (there is no formal austempering heat treatment equipment in China); 3. Due to the poor machinability of Aube ductile iron materials (worse than quenched and tempered steel), the processing of Aobei ductile iron gears is also a puzzle

Method used

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  • Art for manufacturing Austempered Ductile iron gear for diesel engine
  • Art for manufacturing Austempered Ductile iron gear for diesel engine

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In the embodiment of the present invention, 1005037AB-6DF1 Aubey (upper) nodular iron crankshaft timing gear is as figure 2 As shown in the photo: the main technical requirements and dimensions of the gear are: modulus m n =3, number of teeth Z=42, tooth profile angle α=20°, gear inner hole size φ104H7( 0 +0.035 ), roughness 1.6, addendum circle size φ132h11 ( -0.25 0 ), gear width 36±0.1, end surface roughness 3.2, effective tooth width 17 0 +0.5 , tooth surface roughness 0.8.

[0027] The production process steps of Aobei (Shangbei) nodular iron crankshaft timing gear are as follows:

[0028] 1. Design and manufacture of iron mold: The gear is cast with iron mold covered with sand, so first of all, according to the product drawing of the gear, add 1.5-3.5mm allowance on one side to make the rough drawing of the casting, and add 5-25mm on one side on the basis of the rough drawing Sand-covered layer design and manufacture of iron molds; chemical composition and...

Embodiment 2

[0042] The main technical requirements and dimensions of the 1006041AB-6DF1 Aube (Shangbei) nodular iron gear in the embodiment of the present invention are: modulus m n = 3, number of teeth Z = 52, tooth profile angle α = 20°, gear inner hole size φ68 0 +0.030 , roughness 1.6, addendum circle size φ162 -0.250 0 , gear width 17 ± 0.2, end surface roughness 3.2, tooth surface roughness 0.8. Electric furnace smelting molten iron: The raw material formula for smelting molten iron is 70% by weight of pig iron, 20% by weight of returned iron, and 10% by weight of scrap steel. During chemical treatment, 1.6% by weight of rare earth magnesium ferrosilicon intermediate alloy nodulizer and 0.7% by weight of 75 ferrosilicon covering agent were put into 97.2% by weight of ladle molten iron, and then put into inoculant for inoculation treatment. The inoculant formula is 0.5% by weight of 75 ferrosilicon, the chemical composition after treatment must meet the above chemical composition...

Embodiment 3

[0044] The main technical requirements and dimensions of the 1006042AB-6DF1 Aube (Shangbei) nodular iron gear in the embodiment of the present invention are: modulus m n =3, number of teeth Z=26, tooth profile angle α=20°, gear inner hole size φ52H7( 0 +0.030 ), roughness 1.6, addendum circle size φ84h11 ( -0.22 0 ), gear width 46d9( -0 142 -0.080 ), the end surface roughness is 1.6, the tooth width is 25.5±0.1, and the tooth surface roughness is 0.8. Electric furnace smelting molten iron: the raw material formula for smelting molten iron is 60% by weight of pig iron, 30% by weight of returned iron, and 10% by weight of scrap steel. During chemical treatment, put 1.3% by weight of rare earth magnesium ferrosilicon master alloy spheroidizer and 0.6% by weight of 75 ferrosilicon covering agent into 97.7% by weight of ladle molten iron, and then put inoculant for inoculation treatment. The inoculant formula is 0.4% by weight 75 ferrosilicon. The temperature of molten iron ...

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Abstract

A technology for manufacturing the gear with modular 'austenite plus residual bainite' iron and used for the diesel engine includes such steps as making iron mould, making sand mould, smelting in electric furnace, nodulizing, pouring, annealing, ultrasonic inspection, primary machining, semi-fine machining, hobbing gear, iso-quenching, blasting pills, fine machining, grinding teeth, marking, washing, and applying antirust oil. It has high mechanical performance and strength.

Description

technical field [0001] The present invention relates to a kind of manufacturing technology of the Austenitic nodular iron gear used in the diesel engine, specifically, the Austenitic (upper bainite) nodular iron gear with upper bainite + retained austenite is used to manufacture the gear, and it is applied to high-power A vehicle diesel engine belongs to the technical field of mechanical parts. Background technique [0002] Aube ductile iron material is a new type of material developed in the 1970s, which is obtained by austempering heat treatment of nodular iron material. According to the heat treatment and austempering temperature, it can be roughly divided into martensite + lower bainite (Mabei), lower bainite + retained austenite (lower bainite), upper bainite + retained austenite (Shangbei) Three types. The United States focuses on the development of mapei, Finland and other European countries focus on the development of upper shellfish, while my country focuses on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
Inventor 钱鲁阳杨钧强
Owner FAW GROUP
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