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Preparation method of vermicular graphite cast iron automobile exhaust manifold

A technology for vermicular graphite cast iron and automobile exhaust, which is applied in foundries, casting equipment, casting molding equipment, etc., can solve the problems of large amount of rare earths, difficult grinding and high production cost, and achieves small amount of rare earths and good ventilation conditions. , The effect of low production cost

Active Publication Date: 2020-04-10
山东时风(集团)有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process takes a long time, the efficiency is not high, and the energy consumption is relatively high.
[0006] 3. The quality of the casting model is not considered in the whole process, the surface of the casting brake drum is not smooth, and the brake drum made of vermicular graphite cast iron is difficult to polish, which increases the processing cost
[0007] 4. The amount of rare earth used in the vermicular agent is large, resulting in high production cost, which limits its application in ordinary occasions
[0008] 5. During vermicularization, the remaining impurities after the reaction of the vermative agent are easy to enter the molten iron, which will have a certain impact on the quality of the pouring, etc.

Method used

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  • Preparation method of vermicular graphite cast iron automobile exhaust manifold
  • Preparation method of vermicular graphite cast iron automobile exhaust manifold
  • Preparation method of vermicular graphite cast iron automobile exhaust manifold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1. A kind of vermicular graphite cast iron automobile exhaust manifold, is characterized in that, comprises the steps:

[0050] Step 1: Prepare 30kg of steel scrap and 35kg of recycled material for every 100kg of pig iron according to the weight ratio, and put part of the pig iron, all of the scrap steel, and all of the recycled material into a low-frequency induction furnace for melting.

[0051] Step 2: Introduce argon gas into the low-frequency induction furnace, add nickel plate and carburant; the amount of nickel plate added is 0.05% of the total weight of the solution; control the amount of carburant added so that the carbon content of the solution is: 3.6 %; wherein the carbon equivalent needs to be kept at 4.07%, and the carbon equivalent=mass percentage of carbon+(mass percentage of silicon / 3); after nickel is completely melted, remove slag and set aside.

[0052] Step 3: Spread a layer of ferrosilicon on the bottom of the intermediate frequency induct...

Embodiment 2

[0071] Example 2. A kind of vermicular graphite cast iron automobile exhaust manifold, is characterized in that, comprises the steps:

[0072] Step 1: Prepare 25kg of steel scrap and 35kg of recycled material for every 100kg of pig iron according to the weight ratio, and put part of the pig iron, all of the scrap steel, and all of the recycled material into a low-frequency induction furnace for melting.

[0073] Step 2: Introduce argon gas into the low-frequency induction furnace, add nickel plate and carburant; the amount of nickel plate added is 0.06% of the total weight of the solution; control the amount of carburant added so that the carbon content of the solution is: 3.65 %; wherein the carbon equivalent needs to be maintained at 4.08%, and the carbon equivalent=mass percentage of carbon+(mass percentage of silicon / 3); after all nickel melting is completed, slag is removed and set aside.

[0074] Step 3: Spread a layer of ferrosilicon on the bottom of the intermediate f...

Embodiment 3

[0090] Example 3. A kind of vermicular graphite cast iron automobile exhaust manifold, is characterized in that, comprises the steps:

[0091] Step 1: Prepare 20kg of steel scrap and 30kg of recycled materials for every 100kg of pig iron according to the weight ratio, and put part of the pig iron, all of the scrap steel, and all of the recycled materials into a low-frequency induction furnace for melting.

[0092] Step 2: Introduce argon gas into the low-frequency induction furnace, add nickel plate and carburant; the amount of nickel plate added is 0.07% of the total weight of the solution; control the amount of carburant added so that the carbon content of the solution is: 3.75 %; wherein the carbon equivalent needs to be kept at 4.07-4.35%, and the carbon equivalent=mass percentage of carbon+(mass percentage of silicon / 3); after the nickel is completely melted, remove slag and set aside.

[0093] Step 3: Spread a layer of ferrosilicon on the bottom of the intermediate freq...

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Abstract

The invention discloses a preparation method of a vermicular graphite cast iron automobile exhaust manifold. The method comprises the following steps that part of pig iron, scrap steel and foundry returns are added into a low-frequency induction furnace for melting, argon is introduced into the low-frequency induction furnace, and a nickel plate and carburetant are added; a layer of silicon iron is paved at the furnace bottom of a medium-frequency induction furnace to form a silicon iron layer, part of pig iron is added to form a pig iron layer, heating is performed, and electrolytic copper, ferromanganese and ferromolybdenum are added before the added silicon iron and pig iron are not completely molten; a low-frequency induction furnace solution is poured into the medium-frequency induction furnace from the center of the top of the medium-frequency induction furnace through a pipeline; vermicularizing is performed on the medium-frequency induction furnace solution in a vermicularizingcasting ladle; and pouring is performed. The method has the advantages that the exhaust manifold production speed is high, the exhaust manifold quality is good and the cost is low.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a method for preparing a vermicular graphite cast iron automobile exhaust manifold. Background technique [0002] The automobile industry is the pillar industry of the national economy. Every technological progress in the automobile industry will bring significant economic and social benefits. Reducing energy consumption, reducing environmental pollution and saving limited resources are very important and urgent issues facing the development of today's automobile industry. The problem. Improving engine efficiency and reducing exhaust emission pollution are the main directions for the development of automobile engine technology. The use of supercharger technology is an effective means to improve engine efficiency, reduce fuel consumption, and reduce fuel consumption. The working temperature of the turbocharger is relatively high. The working temperature of the turbochar...

Claims

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Application Information

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IPC IPC(8): C21C1/08C22C33/10C22C37/10B22D41/00B22D1/00B22D47/02B22C1/18B22D43/00
CPCB22C1/181B22D1/007B22D41/00B22D43/004B22D47/02C21C1/08C22C33/10C22C37/10Y02P10/20
Inventor 林连华徐海港纪昌勇于子岭张中凯林堂国许爱国李汝学刘兴明
Owner 山东时风(集团)有限责任公司
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