Instant inoculation method of large-section magnesium iron

A technology of instantaneous inoculation and large cross-section, which is applied in the field of instantaneous inoculation of large-section ductile iron poured in the sprue box, which can solve the problems of reduced nodularization rate, low nodularization rate, graphite distortion and fragmented graphite, etc., and achieve low temperature impact Good performance, improved quality stability, and the effect of eliminating fragmented graphite

Inactive Publication Date: 2009-08-19
辽宁隆达集团百星达铸造有限责任公司
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem with this method is that the inoculant can only enter the cavity after it is completely dissolved in the sprue box. Preservation, cannot quickly enter the cavity and cool down rapidly with the casting body, so it is easy to reduce the nodulizer rate, inoculation recession, graphite distortion, and fragmented graphite, which in turn leads to a reduction in the nodularization rate, making the mechanical properties of the casting The performance does not meet the technical standard requirements
[0004] There are many kinds of inoculants currently used: 75SiFe, Si-Ba, Si-Sr, Si-Zr, etc., but for large-section ductile iron, none of them can achieve a satisfactory spheroidizing effect, and graphite distortion or even Fragmented graphite, the spheroidization rate is low, which leads to the mechanical properties of the castings not meeting the standard requirements

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Instant inoculation method of large-section magnesium iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment: Taking the hub of a 1.5MW wind turbine as an example, the present invention will be further described with reference to the accompanying drawings.

[0019] 1. First determine the parameters and variable relationships:

[0020] A. Pouring time calculation

[0021] The weight of the casting is W=10500kg, and it is cast without a riser, and the process yield is designed to be 88%, so the weight of the casting is: G=11930Kg.

[0022] The pouring time is: t=(2 / 3)×mG 1 / 2 = 138s. In the formula, m is the wall thickness coefficient, which is 1.9; G is the pouring weight (kg).

[0023] B. Calculation of the molten iron flow at the exit of sprue box 9

[0024] The weight of molten iron is G=11930Kg, and the density of molten iron is r 铁水 =7×10 -3 kg / cm 3 ;

[0025] Set sprue box 9 diameter D 1 (cm), the cross-sectional area of ​​gate box 9 is S 1 (cm 2 ), the initial liquid level height of sprue box 9 is h 1 (cm), the height of the choke section is h x (c...

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 an inoculation method for large-section ductile iron, which can accurately change the adding speed of inoculant according to different flow rates of molten iron during pouring. The method can be used for producing the large-section ductile iron with high performance requirement and capable of resisting low-temperature shock. The inoculation method for the large-section ductile iron is characterized in that the molten iron is poured into a straight pouring channel from a runner box, an automatic feeding device adds the inoculant into the straight pouring channel through a pipeline at the same time of pouring, the inoculant and the molten iron are in a half filling state in the straight pouring channel, mixed and then poured into a die cavity, and the automatic feeding device automatically adjusts the adding speed of the inoculant according to the flow change of the molten iron.

Description

technical field [0001] The invention relates to an instantaneous inoculation method, in particular to an instantaneous inoculation method for pouring large-section ductile iron by using a sprue box. Background technique [0002] In the production process of large-section ductile iron, the most prominent problems are spheroidization and inoculation recession, which lead to fragmented graphite or graphite distortion, and deteriorate the performance of castings, so inoculation treatment is extremely important. The inoculation treatment can determine the size of the ball diameter, the number of graphite balls, the roundness of the graphite balls, and even the key factors to inhibit the decline of the balls. Obtaining a high-grade inoculant effect is not only related to the composition and amount of the inoculant, but also closely related to the time and method of adding the inoculant. Usually, the closer the inoculation treatment is to the solidification time of molten iron, th...

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): B22D1/00C22C33/08
Inventor 宫俊波
Owner 辽宁隆达集团百星达铸造有限责任公司
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