CN105401068A

CN105401068A - Cast iron alloy material for crankshaft

Info

Publication number: CN105401068A
Application number: CN201510979468.4A
Authority: CN
Inventors: 张淑芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2016-03-16

Abstract

The invention discloses a cast iron alloy material for a crankshaft. The cast iron alloy material for the crankshaft contains the following chemical components in percentage by weight: 2.7% of C, 3.9% of Si, 0.8% of Cu, 0.5% of Ni, 0.3% of Mn, 0.04% of Mg, 0.001% of Bi, 0.0015% of Ta, 0.2% of Cs, 0.05% of Ir, 0.05% of Ru and 0.02% of S, wherein the mixing ratio of C and Si is quite close to an eutectic mixing ratio; the content of pearlite in the alloy is 75-80% in percentage by volume; and the content of graphite in the alloy is 8.5% in percentage by volume at most. Compared with the prior art, the elastic modulus of the alloy can be effectively increased to be greater than 275 GPa, and is increased by one time; the danger of cracking is reduced remarkably; and the service life of the crankshaft is prolonged remarkably.

Description

For the cast iron alloy material of bent axle

Technical field

The present invention relates to a kind of cast iron alloy material for bent axle.

Background technology

In prior art, the cast iron alloy material for bent axle has following defect: modulus of elasticity is poor, do not meet now mechanical means to the intensity of bent axle and modulus of elasticity requirement, easily cause fracture in actual use, work-ing life is short, and the stiffness of bent axle is inadequate, operates more not steady.

Summary of the invention

In view of this, technical problem to be solved by this invention is: the cast iron alloy material for bent axle providing a kind of not easy fracture.

In order to achieve the above object, the present invention adopts following technical scheme to realize:

A kind of cast iron alloy material for bent axle, its chemical composition contained is C, Si, Cu, Ni, Mn, Mg, Bi, Ta, Cs, Ir, Ru and S, rate meter by weight percentage, comprise in described alloy: C2.7%, Si3.9%, Cu0.8%, Ni0.5%, Mn0.3%, Mg0.04% and Bi0.001%, Ta0.0015%, Cs0.2%, Ir0.05%, Ru0.05%, S0.02%, wherein the ratio of mixture of C and Si is in close proximity to eutectic mixture ratio, wherein said alloy has the content of pearlite in alloy of 75-80 volume %, and there is the content of graphite of 8.5 volume % at the most.

As shown from the above technical solution, the invention has the beneficial effects as follows:

Compared to existing technology, the present invention adds bismuth (Bi) in the alloy, tantalum (Ta), caesium (Cs), iridium (Ir) and ruthenium (Ru), effectively can carry heavy alloyed modulus of elasticity to being greater than 275GPa, be doubled than prior art, significantly reduce the danger of fracture, extend the work-ing life of bent axle, bent axle more of the prior art can increase the service life at least 4 years, simultaneously, the rigidity of bent axle too increases one times, therefore bent axle smooth operation can be made, the vibrations acted on crankbearing are reduced, therefore, bearing and bent axle have longer working life.In the present invention, the roundness of globular graphite is better, the matrix of either pearlite occurred significantly improves, thus effectively improve the comprehensive mechanical performance of ironcasting, the amount of the cast iron alloy material being used for bent axle is used greatly to reduce, equally even better mechanical property can be reached, greatly reduce raw materials cost, good in economic efficiency.

Embodiment

In order to make those skilled in the art can further understand feature of the present invention and technology contents, refer to following detailed description for the present invention.

Embodiment 1:

The automobile engine crankshaft of passenger vehicle is made up of the cast iron containing following chemical constitution: its chemical composition contained is C, Si, Cu, Ni, Mn, Mg, Bi, Ta, Cs, Ir, Ru and S, rate meter by weight percentage, comprise in described alloy: C2.7%, Si3.9%, Cu0.8%, Ni0.5%, Mn0.3%, Mg0.04% and Bi0.001%, Ta0.0015%, Cs0.2%, Ir0.05%, Ru0.05%, S0.02%, wherein the ratio of mixture of C and Si is in close proximity to eutectic mixture ratio, wherein said alloy has the content of pearlite in alloy of 75-80 volume %, and there is the content of graphite of 8.5 volume % at the most.

Microstructure is by the perlite of 75-80 volume %, and the Fe forms composition of 20-25%, the total content of graphite is 8.3%.When yardstick is 6-7, the shaping of described graphite is greater than 96%V and VI (according to DINENIS0945).

The mechanical property had of described foundry goods is: Rp _0.2=1000N/mm ², Rm=1100N/mm ², and A=2.45%, modulus of elasticity is 295GPa, and the hardness on whole transverse section is 459-494HB10/3000.

But the foregoing is only better possible embodiments of the present invention, and be not used to limit to the scope of the claims of the present invention, therefore the equivalent structure change that all utilizations description of the present invention is done, all in like manner within the scope of the present invention.

Claims

1. the cast iron alloy material for bent axle, its chemical composition contained is C, Si, Cu, Ni, Mn, Mg, Bi, Ta, Cs, Ir, Ru and S, rate meter by weight percentage, described alloy composition is: C2.7%, Si3.9%, Cu0.8%, Ni0.5%, Mn0.3%, Mg0.04% and Bi0.001%, Ta0.0015%, Cs0.2%, Ir0.05%, Ru0.05%, S0.02%, wherein the ratio of mixture of C and Si is in close proximity to eutectic mixture ratio, wherein said alloy has the content of pearlite in alloy of 75-80 volume %, and there is the content of graphite of 8.5 volume % at the most.