Production method of spheroidal graphite cast iron for hydraulic parts and prepared spheroidal graphite cast iron

A production method and technology for hydraulic parts, applied in the field of ductile iron, can solve the problems of hardness, tensile strength, yield strength, elongation, and softness of ductile iron.

Active Publication Date: 2012-07-04
SHANDONG CHANGLIN MACHINERY GRP
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supporting hydraulic parts of the 8.5-ton hydraulic excavator are mainly PA10VO71DFLR axial plunger variable pump, V8SX14 hydraulic valve, and MA10FD45 hydraulic motor. The parts made of QT-450 include: oil inlet valve body, boom valve body , Tail valve body, intermediate valve body, back cover, housing, pump body, cylinder block, swash plate, control valve body, valve body, swash plate, so when these components are made of ductile iron, today’s The hardness, tensile strength, yield strength and elongation of ductile iron are not ideal, and the ferritic ductile iron is too soft during processing, so different formulas should be adopted in the production method of ductile iron to solve this problem. question

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

[0015] Embodiment 1: a kind of production method of ductile iron for hydraulic parts, its steps are as follows:

[0016] Batching process: The raw materials used in the batching process are as follows: 25kg of steelmaking pig iron, 33kg of steel scrap, 26.5kg of recycled material, 0.3kg of red copper, and 0.5kg of carbonizing agent; the steelmaking pig iron requires 4% carbon, 0.1% silicon, 0.1% manganese, Phosphorus 0.01%, sulfur 0.01%, and the balance is Fe; scrap steel is stamping waste leftovers such as ordinary automobiles, and its material is Q235; the recycled material is ductile iron waste or pouring risers of the same brand.

[0017] Feeding and melting process: After the batching is completed, in the feeding and melting process, steelmaking pig iron, scrap steel, and furnace materials are added sequentially from bottom to top in the electric furnace. With the increase of the power of the electric furnace, all the furnace materials are melted, and samples are taken for...

Embodiment 2

[0020] Embodiment 2: a kind of production method of ductile iron for hydraulic parts, its steps are as follows:

[0021] Batching process: The raw materials used in the batching process are as follows: 35kg of pig iron for steelmaking, 43kg of steel scrap, 36.5kg of recycled material, 0.5kg of red copper, and 2.5kg of carbonizing agent; the pig iron for steelmaking requires 8% carbon, 0.8% silicon, 0.6% manganese, Phosphorus 0.04%, sulfur 0.05%, and the balance is Fe; scrap steel is stamping waste leftovers such as ordinary automobiles, and its material is Q235; the recycled material is ductile iron waste or pouring risers of the same brand.

[0022] Feeding and melting process: After the batching is completed, in the feeding and melting process, steelmaking pig iron, scrap steel, and furnace materials are added sequentially from bottom to top in the electric furnace. With the increase of the power of the electric furnace, all the furnace materials are melted, and samples are t...

Embodiment 3

[0025] Embodiment 3: a kind of production method of ductile iron for hydraulic parts, its steps are as follows:

[0026] Batching process: The raw materials used in the batching process are as follows: 30kg of pig iron for steelmaking, 38kg of steel scrap, 31.5kg of recycled materials, 0.4kg of red copper, and 1.5kg of carbonizing agent; the pig iron for steelmaking requires 6% carbon, 0.5% silicon, 0.3% manganese, Phosphorus 0.02%, sulfur 0.03%, and the balance is Fe; scrap steel is stamping waste leftovers such as ordinary automobiles, and its material is Q235; the recycled material is ductile iron waste or pouring risers of the same brand.

[0027] Feeding and melting process: After the batching is completed, in the feeding and melting process, steelmaking pig iron, scrap steel, and furnace materials are added sequentially from bottom to top in the electric furnace. With the increase of the power of the electric furnace, all the furnace materials are melted, and samples are ...

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

No PUM Login to view more

Abstract

The invention relates to a production method of spheroidal graphite cast iron for hydraulic parts and prepared spheroidal graphite cast iron. The production method comprises the following steps of a material proportioning procedure, a charging melting procedure and a nodulizing inoculation procedure. In the material proportioning process of the material proportioning procedure, the adopted raw materials by weight part comprise 25-35 parts of pig iron for steelmaking, 33-43 parts of steel scrap, 26.5-36.5 parts of scrap return, 0.3-0.5 part of red copper and 0.5-2.5 parts of carburizing agent.A completely new formula is adopted. As a defined amount of red copper is added in ferritic nodular iron, a matrix structure can be added with 20-40 percent of pearlite content, the hardness can be increased by 8-10 percent, the tensile strength can be increased by 9-11 percent, the yield strength can be increased by 8-10 percent, and the elongation can be reduced by 20-30 percent. The too-soft defect of the ferritic nodular iron in the machining process can be obviously overcome, and the machining performance is increased.

Description

technical field [0001] The invention relates to nodular cast iron, in particular to a production method of nodular cast iron for hydraulic parts and the prepared nodular cast iron. Background technique [0002] Ductile iron is a gray cast iron with excellent mechanical properties. Generally, before pouring, add a small amount of spheroidizer (usually magnesium, rare earth magnesium alloy or cerium-containing rare earth alloy) and inoculant (usually ferrosilicon) to molten iron to obtain spherical graphite through spheroidization and inoculation treatment, with Strong anti-oxidation growth, corrosion resistance and machinability, but the linear shrinkage rate and thermal cracking tendency are small, especially the plasticity and toughness are improved, so that the strength is higher than that of carbon steel, and its comprehensive performance is close to that of steel , which effectively improves the mechanical properties of cast iron. Based on its excellent performance, it ...

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): C22C33/08C22C37/10C22C37/04C21C1/10
CPCY02P10/20
Inventor 韩斌杨大波高公如张为哲唐成栋张学春张梦荣王振华徐雪芹
Owner SHANDONG CHANGLIN MACHINERY GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap