Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nodular cast iron used for crankshafts and preparation method thereof

A ductile iron and crankshaft technology, applied in the field of ductile iron, can solve the problems of high strength, high speed, high power, etc., so as to reduce the amount of pig iron, the quality of spheroidization is stable and controllable, and the bearing capacity and reliability are improved. Effect

Active Publication Date: 2016-08-24
HANSHAN COUNTY XINGDA DUCTILE IRON FACTORY
View PDF11 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding problem of the existing nodular cast iron crankshaft is that it cannot ensure high strength and high toughness at the same time. Therefore, the characteristics of the manufacturing material of the existing nodular cast iron crankshaft itself become a constraint for high speed and high power, and the realization of energy saving and emission reduction Primary Factors for Development Purpose

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of nodular cast iron for crankshafts, the mass percent of each element composition is: C: 3.7%, Si: 2.1%, Mn: 0.5%, Cu: 0.55%, Mg: 0.03%, Sn: 0.025%, Ni: 0.05% , Ge: 0.01%, Sb: 0.0045%, P: ≤0.03%, S: ≤0.01%, and the balance is Fe.

[0019] The preparation method of nodular cast iron for crankshaft specifically comprises the following steps:

[0020] (1) Raw material smelting: Add pig iron and high-quality carbon structural scrap to an intermediate frequency induction furnace for melting. During the smelting process, ensure that the temperature of the molten iron is 1500°C, and then add the prepared copper and nickel ingots into the furnace to detect iron. The content of each element in the water, and adjust the content of each element to meet the formula requirements, and then perform desulfurization treatment;

[0021] (2) Spheroidization treatment and inoculation treatment: pulverize rare earth magnesium alloy spheroidizers and recarburizers with a total weigh...

Embodiment 2

[0026] A kind of nodular cast iron for crankshafts, the mass percent of each element composition is: C: 3.8%, Si: 1.9%, Mn: 0.6%, Cu: 0.4%, Mg: 0.035%, Sn: 0.02%, Ni: 0.06% , Ge: 0.005%, Sb: 0.005%, P: ≤0.03%, S: ≤0.01%, and the balance is Fe.

[0027] The preparation method of nodular cast iron for crankshaft specifically comprises the following steps:

[0028] (1) Raw material smelting: Add pig iron and high-quality carbon structural scrap to the intermediate frequency induction furnace for melting in sequence. During the smelting process, the temperature of molten iron is guaranteed to be 1450°C, and then the prepared copper and nickel ingots are added to the furnace to detect iron. The content of each element in the water, and adjust the content of each element to meet the formula requirements, and then perform desulfurization treatment;

[0029] (2) Spheroidization treatment and inoculation treatment: pulverize rare earth magnesium alloy nodulizers and recarburizers with...

Embodiment 3

[0034] A kind of nodular cast iron for crankshafts, the mass percent of each element composition is: C: 3.6%, Si: 2.2%, Mn: 0.4%, Cu: 0.7%, Mg: 0.03%, Sn: 0.03%, Ni: 0.04% , Ge: 0.015%, Sb: 0.004%, P: ≤0.03%, S: ≤0.01%, and the balance is Fe.

[0035] The preparation method of nodular cast iron for crankshaft specifically comprises the following steps:

[0036] (1) Raw material smelting: Add pig iron and high-quality carbon structural scrap to an intermediate frequency induction furnace for melting. During the smelting process, ensure that the temperature of the molten iron is 1480°C, and then add the prepared copper and nickel ingots into the furnace to detect iron The content of each element in the water, and adjust the content of each element to meet the formula requirements, and then perform desulfurization treatment;

[0037] (2) Spheroidization treatment and inoculation treatment: pulverize the rare earth magnesium alloy spheroidizer and recarburizer with a total weight...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of nodular cast iron and in particular relates to nodular cast iron used for crankshafts and a preparation method thereof. The nodular cast iron used for crankshafts comprises the following elements by mass percent: 3.6-3.8% of C, 1.9-2.2% of Si, 0.4-0.6% of Mn, 0.4-0.7% of Cu, 0.03-0.035% of Mg, 0.02-0.03% of Sn, 0.04-0.06% of Ni, 0.005-0.015% of Ge, 0.004-0.005% of Sb, not more than 0.03% of P, not more than 0.01% of S and the balance of Fe. The preparation method mainly comprises the following steps: raw material smelting, spheroidizing, inoculation and heat treatment. The nodular cast iron and the preparation method have the beneficial effects that by reasonably allocating the elements, the prepared nodular cast iron used for crankshafts has high strength and toughness, has higher rigidity and wear resistance, has the effect of improving the bearing capacities and reliability of the crankshafts, and has prolonged service life; and meanwhile, by optimizing the preparation method, the production cost is reduced and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of nodular cast iron, in particular to a graphite cast iron for a crankshaft and a preparation method thereof. Background technique [0002] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and durability. Parts with high abrasiveness requirements. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. The so-called "substituting iron for steel" mainly refers to ductile iron. [0003] The cran...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/10C21D5/00
CPCC21D5/00C22C33/10C22C37/04C22C37/10
Inventor 张福新
Owner HANSHAN COUNTY XINGDA DUCTILE IRON FACTORY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com