A thin-wall heat-resistant steel exhaust manifold casting method

An exhaust manifold and heat-resistant steel technology, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of complex process, inability to meet lightweight technical requirements, and exhaust manifold wall thickness, etc. Stable performance, lightweight design, weight reduction effect

Active Publication Date: 2019-10-08
西峡飞龙特种铸造有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inner sand core of the exhaust manifold is an internal circulation sand core, and the outer cavity sand core is inlaid with cold iron at the position of the two pipe clamps. Technical requirements need to be improved

Method used

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  • A thin-wall heat-resistant steel exhaust manifold casting method
  • A thin-wall heat-resistant steel exhaust manifold casting method
  • A thin-wall heat-resistant steel exhaust manifold casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A thin-walled heat-resistant steel exhaust manifold casting method, comprising the following steps:

[0035] S1: Core making: Use coated sand as the raw material of the cavity core, heat the core box to 220°C, shoot sand into the core box through the sand injection port for 3-5 seconds, solidify the crust for 2-4 seconds, and pour out the sand by shaking There is no solidified coated sand in the inner cavity of the core, and the weight of each sand core is guaranteed to be 2.5kg. After 180 seconds, the sand core is cured and taken out of the core box;

[0036] S2: Modeling: Heat the temperature of the iron sand box to 130°C, heat the temperature of the cavity core box to 220°C, close the mold and cover the sand with a thickness of 10-12mm, after 120 seconds the sand shell is solidified, close the upper and lower iron sand after the mold is opened box, to be poured;

[0037] S3: Smelting: heat-resistant steel exhaust manifold is prepared from the following raw materials...

Embodiment 2

[0043] This embodiment provides a thin-walled heat-resistant steel exhaust manifold casting method, the steps are the same as the first embodiment, but different from the first embodiment, in the step S3 of this embodiment, the heat-resistant steel exhaust manifold used is as follows Raw material preparation: 60.4% recycled material, 15% steel scrap, 17.5% ferrochromium, 1% ferroniobium, 5% electrolytic nickel, 0.01% ferrous sulfur, 0.49% electrolytic manganese, 0.55% ferrosilicon, and 0.05% recarburizer.

Embodiment 3

[0045] A thin-walled heat-resistant steel exhaust manifold casting method, comprising the following steps:

[0046]S1: Core making: Use coated sand as the raw material for the cavity core, heat the core box to 230°C, shoot sand into the core box through the sand injection port for 3-5 seconds, solidify the crust for 2-4 seconds, and pour out the sand by shaking There is no solidified coated sand in the inner cavity of the core, and the weight of each sand core is guaranteed to be 2.8kg. After 180 seconds, the sand core is cured and taken out from the core box;

[0047] S2: Modeling: Heat the temperature of the iron sand box to 140°C, heat the temperature of the cavity core box to 230°C, close the mold and cover the sand with a thickness of 10-12mm, after 120 seconds the sand shell is solidified, close the upper and lower iron sand after the mold is opened box, to be poured;

[0048] S3: Melting: The raw materials for the preparation of the heat-resistant steel exhaust manifol...

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Abstract

The invention discloses a thin-walled heat resistant steel exhaust gas manifold casting method, and belongs to the technical field of heat resistant steel exhaust gas manifold casting. The casting method comprises the following steps of core manufacturing, modeling, smelting, pouring and sand shakeout. Through the reasonable design of the amount of molten iron entering a pouring channel and the section ratio of each unit in a pouring system and strict control of the iron mold sand covering layer thickness, the mold cavity exhaust gas system and pouring temperature and the sand shankout box opening time, the thickness of the prepared exhaust gas manifold is 3.2-3.6mm, the wall is thin, the grain size level is 5.5, and the technical property reaches the required index. The prepared exhaust gas manifold has the thin wall and low weight, is stable in property, solves the problem that a common wet sand technology is difficult to form, effectively lowers the integral weight, and achieves light-weight design of an engine.

Description

technical field [0001] The invention belongs to the technical field of casting heat-resistant steel exhaust manifolds, and in particular relates to a casting method for thin-walled heat-resistant steel exhaust manifolds. Background technique [0002] With the development of automobile lightweight technology, the engine exhaust temperature continues to increase, and the nickel austenitic ductile iron exhaust manifold with a temperature resistance of 950 °C can no longer meet the emission requirements. At present, heat-resistant steel exhaust manifolds have been put into use in high-end models, with a temperature resistance of 1050°C and good thermal fatigue. The heat-resistant steel exhaust manifold and turbocharger are assembled and used on the engine, and the exhaust emission of the vehicle has been greatly reduced. [0003] In order to meet the lightweight technical requirements of the exhaust manifold, the design wall thickness is reduced from 4.5-4.0mm to 3.6-3.2mm. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/24B22C9/02B22C9/10B22C9/08C22C37/10C22C37/08
Inventor 李可丹王瑞金余嗣瑞李刚王延召闫国富任鹏贾建法
Owner 西峡飞龙特种铸造有限公司
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