A heat-resistant steel volute sprue slag-retaining and shrinkage-feeding process

A technology of heat-resistant steel and volute, which is applied in the technical field of heat-resistant steel volute sprue slag blocking and shrinkage feeding, which can solve the problems of difficult forming and easy oxidation of molten steel, so as to improve the process yield and avoid non-forming , cost reduction effect

Active Publication Date: 2020-01-10
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, a four-unit pouring system is used in the process design of ductile iron parts, such as figure 1 and figure 2 shown, where 1-sprue (F 直 ), 5-lap (F 阻 ), where the lap joint is also called the vertical flow blocking of the runner. 横 ), 7-ingate (F 内 ), F 直 :F 阻 :F 横 :F 内 =1:0.8:1.2:0.9; but the wall of the heat-resistant steel volute is thin, the molten steel is easy to oxidize, and it is difficult to form. The traditional four-unit pouring system is not suitable for casting the heat-resistant steel volute

Method used

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  • A heat-resistant steel volute sprue slag-retaining and shrinkage-feeding process
  • A heat-resistant steel volute sprue slag-retaining and shrinkage-feeding process
  • A heat-resistant steel volute sprue slag-retaining and shrinkage-feeding process

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Experimental program
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Effect test

Embodiment 1

[0029] Such as image 3 with Figure 4 As shown, a heat-resistant steel volute runner includes sprue 1, in which a filter 2 is placed on the upper section of the sprue 1, an "eight" type contraction 3 is set in the middle of the sprue 1, and the lower section of the sprue 1 is set Feeding riser neck 4.

[0030] The slag retaining and feeding process of heat-resistant steel scroll runner includes the following steps:

[0031] (1) Determine the cross-sectional ratio of sprue 1, filter 2 and "eight" type contraction 3, namely F straight : F filter : F Hinder =1: 4: 0.8;

[0032] (2) Determine the filling time of the gating system:

[0033]

[0034] Among them: G is the total weight of molten steel in the mold, including the weight of the pouring riser system;

[0035] (3) Determine the cross-sectional area of ​​each gating system according to the Ozan formula:

[0036]

[0037] Among them: ρ is the density of molten steel, μ is the flow loss coefficient, g is the acceleration due to gr...

Embodiment 2

[0042] In Example 2, G is 40kg, t is 6.1s, Hp is 31cm, and ρ is 0.0076Kg / cm 3 , G is 981cm / S 2 , Μ is 0.35, after calculation, F in this embodiment straight 13.1cm 2 , F filter 52.5cm 2 , F Hinder 10.5cm 2 .

Embodiment 3

[0044] In Example 3, G is 45kg, t is 6.3s, Hp is 31cm, and ρ is 0.0076Kg / cm 3 , G is 981cm / S 2 , Μ is 0.35, after calculation, F in this embodiment straight 14.3cm 2 , F filter 57cm 2 , F Hinder 11.4cm 2 .

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Abstract

The invention belongs to the technical field of heat-resisting steel volute casting, in particular to a slag stopping and feeding process for a heat-resisting steel volute runner. The heat-resisting steel volute runner comprises a sprue, and a filter is arranged on the upper segment of the sprue. A splayed contraction part is arranged in the middle part of the sprue, and a feeding riser neck is arranged on the lower segment of the sprue. The design method of a gating system can conduct high flow and rapid mould filling and avoid the defects of no molding and oxidation slag inclusion. Meanwhile, the number of risers is saved, and the process yield is increased.

Description

Technical field [0001] The invention relates to the technical field of heat-resistant steel scroll casing casting, in particular to a heat-resistant steel scroll casing slag blocking and feeding process. Background technique [0002] With the continuous improvement of environmental protection requirements, the exhaust temperature of automobile engines is getting higher and higher. The exhaust manifold and volute made of nickel austenitic ductile iron resistant to 950 ℃ can no longer meet the requirements of use. At present, exhaust manifolds and volutes made of austenitic-based heat-resistant steel are gradually used in engine exhaust systems, with a temperature resistance of 1050°C, good thermal fatigue and oxidation resistance. [0003] The austenitic matrix heat-resistant steel has high alloy content, large undercooling, poor fluidity, and difficult filling. Heat-resistant steel volutes generally have a wall thickness of 4.5mm. For double-channel volutes, the wall thickness bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/22B22C9/08
CPCB22C9/08B22C9/22
Inventor 李可丹
Owner 西峡飞龙特种铸造有限公司
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