A kind of preparation method of vermicular graphite cast iron automobile exhaust manifold

A technology for automobile exhaust and vermicular graphite cast iron, which is applied in foundry workshops, foundry equipment, casting molding equipment, etc., can solve the problems of difficult grinding, low efficiency and high production cost, achieves good electromagnetic stirring effect, and is convenient to replace steel grades , The effect of reducing the life of the crucible

Active Publication Date: 2021-12-07
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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  • A kind of preparation method of vermicular graphite cast iron automobile exhaust manifold
  • A kind of preparation method of vermicular graphite cast iron automobile exhaust manifold
  • A kind of 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 method for preparing a vermicular graphite cast iron automobile exhaust manifold, which includes: adding part of pig iron, scrap steel, and returned materials to a low-frequency induction furnace for melting, feeding argon gas into the low-frequency induction furnace, adding nickel plates, increasing Carbon agent: Lay a layer of ferrosilicon on the bottom of the intermediate frequency induction furnace to form a ferrosilicon layer, then add some pig iron to form a pig iron layer, raise the temperature, and add electrolytic copper, ferromanganese, and ferromolybdenum before the added ferrosilicon and pig iron are not completely melted ; pouring the low-frequency induction furnace solution into the medium-frequency induction furnace through the pipeline from the center of the top of the medium-frequency induction furnace; The invention has the characteristics of fast production speed of the exhaust manifold, good quality of the exhaust manifold and low cost.

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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Patent Type & Authority Patents(China)
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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