Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of eliminating looseness and shrinkage in lower part of cast steel ingot

A shrinkage and porosity technology, which is applied in the field of casting, can solve the problems of impeding the loose shrinkage of the molten steel feeding channel, and achieve the effect of eliminating central porosity and shrinkage, and accelerating heat dissipation.

Inactive Publication Date: 2014-08-13
UNIV OF SCI & TECH LIAONING
View PDF12 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a method for eliminating loose shrinkage cavities in the lower part of cast steel ingots, and solves the problem of loose shrinkage cavities in the lower part of steel ingots caused by bridging of solidified phases and hindering the feeding channel of molten steel

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
  • Method of eliminating looseness and shrinkage in lower part of cast steel ingot
  • Method of eliminating looseness and shrinkage in lower part of cast steel ingot
  • Method of eliminating looseness and shrinkage in lower part of cast steel ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 , figure 2 As shown, a method for eliminating the loose shrinkage cavity in the lower part of the cast steel ingot. The heat insulation plate 1, the ingot mold 2, the steel ingot 3 and the chassis 5 constitute a die casting system, and the steel ingot with a circular cross section is cast. The height H of the ingot body is 1.5 meters, and the ingot body The diameter D of the middle section is 0.4 meters, according to the cooling height 0.08-0.12×H 2 / D, take the coefficient as 0.1, calculate: 0.1×1.5 2 / 0.4=0.5625 meters, then its cooling zone 4 is the mold wall in the range of 0.5625 meters in height from the bottom of the ingot body. Enhanced cooling is carried out in the cooling area 4. The cooling method adopts a water-cooled ingot mold or a contact-type forced water wall is added to the outer wall of the ingot mold. The enhanced cooling intensity is 3000-4000L / min of cooling water flow per square meter, and the inlet water temperature is 25°C- ...

Embodiment 2

[0022] Such as figure 1 , image 3 As shown, a method for eliminating the loose shrinkage cavity in the lower part of the cast steel ingot. The heat insulation plate 1, the ingot mold 2, the steel ingot 3 and the chassis 5 constitute a die casting system, and the steel ingot with a square cross section is cast. The height H of the ingot body is 1.5 meters, and the side length is a is 0.8 meters, then its equivalent diameter is: the area of ​​the section ÷ the perimeter of the section x 4 = 0.8 2 ÷(4×0.8)×4=0.8m, according to cooling height 0.08-0.12×H 2 / D, take the coefficient as 0.1, then the cooling height is 0.1×1.5 2 / 0.8=0.2812 meters, that is, the cooling area is the mold wall in the range of 0.2812 meters in height from the bottom of the ingot body. Enhanced cooling is carried out in the cooling area 4. The cooling method adopts water-cooled ingot mold or adds a contact type forced water wall on the outer wall of the ingot mold. The enhanced cooling intensity is 300...

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 discloses a method of eliminating looseness and shrinkage in the lower part of a cast steel ingot and solves the problem that since a solidification phase is bridged and a molten steel feeding channel is blocked, the lower part of the steel ingot is subjected to looseness and shrinkage. According to the method, a forced cooling region is arranged on the outer side from a chassis of a cast steel ingot mould to 0.08-0.12*H2 / D height, the cooling is reinforced, in the formula, H is the height of an ingot body, D is the middle cross section diameter of the ingot body, if the section of the ingot body is non-circular, D is an equivalent diameter, and the calculation formula is that section area / section perimeter *4. After the pouring and mold filling are completed, the cooling is reinforced on the outer side of the lower part of the cast steel ingot mould, the heat dissipation of the lower high-temperature region is quickened, the central high-temperature concentration region at the lower part of the steel ingot is eliminated, the sequential solidification from bottom to top is realized, and the central looseness and the shrinkage in the lower part of the steel ingot are effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a method for eliminating loose shrinkage cavities in the lower part of cast steel ingots. Background technique [0002] In the production of steel ingots, especially in the production of shaft steel ingots with the bottom injection method, due to the restriction of cooling conditions in ordinary air-cooled die casting, the solidified metal bridging phenomenon will appear in the lower part of the steel ingot during solidification, that is, the low temperature surrounds the high temperature area, and then in the Porosity and even shrinkage cavities are produced during further solidification. The traditional solution is to feed through the riser, but this method has little effect on the lower loose shrinkage cavity; or it can be used to reduce the aspect ratio or aspect ratio of the steel ingot, but the electrode ingot or shaft blank is due to the subsequent The steel ingot handlin...

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
IPC IPC(8): B22D7/06
Inventor 张振山沈明钢敖广武廖亚莉王艳
Owner UNIV OF SCI & TECH LIAONING