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Intelligent preparation method for vermicular graphite cast iron brake drum

A technology of intelligent preparation and vermicular graphite cast iron, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of large volume of brake drums, low efficiency, and difficulty in grinding, and achieves good electromagnetic stirring effect. It is convenient to change the steel grade and reduce the life of the crucible

Active Publication Date: 2020-05-12
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

Due to the relatively large volume of the brake drum, more molten iron is consumed, so the whole process takes a long time, the efficiency is not high, and the energy consumption is relatively high.
[0008] 2. 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
[0009] 3. 7.5-8.5% RE is used in the vermicular agent, and the amount of rare earth used is large, resulting in high production cost, which limits its application in ordinary occasions
[0010] 4. The materials used in the process are pig iron, steel and other materials, which are not suitable for occasions where scrap steel, recycled materials and other raw materials are used
[0011] 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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  • Intelligent preparation method for vermicular graphite cast iron brake drum
  • Intelligent preparation method for vermicular graphite cast iron brake drum
  • Intelligent preparation method for vermicular graphite cast iron brake drum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1. An intelligent preparation method for a vermicular graphite cast iron brake drum, comprising the steps of:

[0052] Step 1: Prepare 30kg of steel scrap and 50kg 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.

[0053] Step 2: Add carburant, 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); remove the slag, spare.

[0054] Step 3: 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, add a part of electrolytic copper and ferromanganese before the added ferrosilicon and pig ir...

Embodiment 2

[0068] Example 2. The difference between this embodiment and Embodiment 1 is that an intelligent preparation method of a vermicular graphite cast iron brake drum includes the following steps:

[0069] Step 1: Prepare 25kg of steel scrap and 45kg 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 to melt.

[0070] Step 2: add carburant, control the amount of carburant added, so that the carbon content of the solution is: 3.7%; wherein the carbon equivalent needs to be kept at 4.2%, and the carbon equivalent=mass percentage of carbon+(mass percentage of silicon / 3); remove the slag, spare.

[0071] Step 3: 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, add a part of electrolytic copp...

Embodiment 3

[0087] Example 3. The difference between this embodiment and Embodiment 1 is that an intelligent preparation method of a vermicular graphite cast iron brake drum comprises the following steps:

[0088] Step 1: Prepare 25kg of steel scrap and 40kg 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.

[0089] Step 2: Add carburant, control the amount of carburant added, so that the carbon content of the solution is: 3.71%; wherein the carbon equivalent needs to be kept at 4.28%, and the carbon equivalent=mass percentage of carbon+(mass percentage of silicon / 3); remove the slag, spare.

[0090] Step 3: 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, add a part of electrol...

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Abstract

The invention discloses an intelligent preparation method for a vermicular graphite cast iron brake drum. The intelligent preparation method comprises the following steps of adding part of pig iron, scrap steel and foundry returns into a low-frequency induction furnace for melting, and controlling the addition amount of a carburant; paving the bottom of a medium-frequency induction furnace with alayer of ferrosilicon to form a ferrosilicon layer, adding part of pig iron to form a pig iron layer, rising the temperature, and adding part of electrolytic copper and ferromanganese before the addedferrosilicon and pig iron are completely molten; pouring solution prepared in the low-frequency induction furnace into the medium-frequency induction furnace from the center of the top of the medium-frequency induction furnace through a pipeline; vermicularizing the solution in the medium-frequency induction furnace in vermicularizing casting ladles; and carrying out pouring. The intelligent preparation method for the vermicular graphite cast iron brake drum has the advantages of being high in brake drum production speed, good in brake drum quality and low in cost.

Description

technical field [0001] The invention relates to the field of brake drums, in particular to a method for manufacturing a brake drum. Background technique [0002] The brake drum is the main braking element in the axle braking system. When the car is braking, the braking force is generated by the friction between the brake pads and the inner wall of the brake drum. The friction between the inner wall of the brake drum and the brake pads produces the braking effect. During the friction process, heat will be generated. During the friction process and after the friction is stopped, different parts of the brake drum will also alternate between cold and heat. The moving drum has good wear resistance, thermal conductivity and thermal fatigue resistance. [0003] According to statistics, at present, brake drum cracking accounts for more than 80% of the failure cases, and the cracking is mainly caused by thermal fatigue cracks. Existing brake drums are generally made of gray cast i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/10B22C1/02B22C9/02B22C9/22B22D1/00C21C1/08
CPCB22C1/02B22C9/02B22C9/22B22D1/00C21C1/08C22C33/10C22C37/10Y02P10/20
Inventor 刘成强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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