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Method for producing vermicular cast iron brake drum

A technology of vermicular graphite cast iron and production method, which is applied in the direction of brake parts, etc., can solve the problems of short service life, poor thermal conductivity, low strength, etc., and achieve the effect of long service life, good thermal conductivity and high strength

Active Publication Date: 2011-04-06
山西汤荣机械制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production method of a vermicular graphite cast iron brake drum provided by the invention solves the technical problems of heavy weight, low strength, poor thermal conductivity and short service life of the existing vehicle brake drum

Method used

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  • Method for producing vermicular cast iron brake drum
  • Method for producing vermicular cast iron brake drum
  • Method for producing vermicular cast iron brake drum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Controlling chemical composition, cooling conditions and pre-furnace treatment technology is the key to producing vermicular graphite iron brake drum.

[0019] By changing the material ratio, and the pre-furnace treatment process, selecting the vermicular agent and inoculant, and timely testing and tracking the product performance, a large number of tests have been carried out, and the following detailed data have been obtained. The measures for graphite cast iron are as follows:

[0020] 1. Selection of raw materials:

[0021] (1) Pig iron: use Q12 pig iron specified in GB18-82 and GB412-85, the chemical composition is as follows (%):

[0022] C

S

P

Si

mn

4.10～4.30

＜0.05

≤0.09

1.00～1.40

≤1.30

[0023] (2) Steel:

[0024] According to the provisions of GB4223-84 "Classification and Technical Conditions of Returned Carbon Steel Scrap", select carbon steel scrap, including ordinary carbon steel, high-qualit...

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Abstract

The invention discloses a method for producing a vermicular cast iron brake drum, which solves the problems of too heavy weight, low strength and short service life in the traditional vehicle brake drum. The method comprises the following steps of: weighing 84 portions by weight of pig iron, 16 portions by weight of steel, 0.7 portion by weight of manganese iron and 0.68 portion by weight of ferrosilicon accounting for 100 portions by weight, and smelting in an electric furnace; taking a vermiculated iron ladle, and arranging a dike on the bottom of the vermiculated iron ladle to separate the bottom of the vermiculated iron ladle into a region A and a region B, wherein the height of the dike is 100-250mm;preparing a vermiculizer, an inoculant and metallic tin; pouring the base iron into the region B separated on the bottom of the vermiculated iron ladle; and after the vermiculated iron ladle is filled up, holding the emulsification time for 1-1.5 minutes to obtain the liquid vermicular cast iron, and pouring the liquid vermicular cast iron into a brake drum casting die to obtain the vermicular cast iron brake drum. The vehicle brake drum has the advantages of high strength, light weight, favorable thermal conductivity and long service life.

Description

technical field [0001] The invention relates to a method for manufacturing a vehicle brake drum, in particular to a method for manufacturing a vermicular graphite cast iron brake drum. Background technique [0002] The vehicle brake drums in the prior art are usually cast from gray iron, ductile iron or cast steel, which have the defects of heavy weight, low strength, poor thermal conductivity and short service life. The above defects often lead to the failure of the brake drum due to out-of-roundness, bottom drop, thermal cracking, hard shift, etc., which threaten the safety of driving vehicles and also bring a greater economic burden to vehicle maintenance. The market urgently needs a new type of brake drum with high strength, good thermal conductivity and long service life. Contents of the invention [0003] The production method of the vermicular graphite cast iron brake drum provided by the invention solves the technical problems of heavy weight, low strength, poor t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08F16D65/02
Inventor 杨自勇王小妍孟喜明陈世强王东会
Owner 山西汤荣机械制造股份有限公司
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