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Engine camshaft chilled cast iron and manufacturing method thereof

A camshaft and engine technology, applied to engine components, machines/engines, manufacturing tools, etc., can solve problems such as difficulty in controlling the depth of the cold shock layer, the hardness of the cam cannot be wear-resistant, and long working hours

Inactive Publication Date: 2010-03-03
SAIC-GM-WULING AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing chilled alloy cast iron camshafts are either hard to control the depth of the chilled layer, the hardness of the cam cannot meet the requirements of wear resistance, or require subsequent hardening treatment processes.
Current chilled cast irons for camshafts generally have relatively poor wear resistance, poor scratch resistance, anti-adhesion and anti-stripping strength and toughness, which cannot fully meet the requirements of high-speed, high-load and alternating load conditions.
Moreover, such chilled cast iron requires subsequent quenching and hardening treatment process, which makes the working hours longer and the cost higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: The chemical composition percentage of camshaft chilled cast iron is C 3.0%-3.2%; Si 2.3%-2.4%; Mn 0.7%-0.9%; P 0.8%-0.12%; S 0.8%-0.10%; Cu 0.2 % ~ 0.3%; Cr 0.2% ~ 0.3%, the balance is Fe and unavoidable trace impurities. The depth of the chill layer in the cam peach tip area of ​​the camshaft made of chilled cast iron is controlled at 7-10mm, and the hardness is controlled at 52-56HRC (within the range of 40 degrees of the tip angle); the depth of the chill layer in the cam transition zone is controlled at 5 -8mm, the hardness is controlled at 43-47HRC.

Embodiment 2

[0035] Embodiment 2: The chemical composition percentage of camshaft chilled cast iron is C 3.0%-3.2%; Si 2.2%-2.3%; Mn 0.6%-0.8%; P 0.6%-0.10%; S 0.9%-0.12%; Cu 0.2 % ~ 0.3%; Cr 0.3% ~ 0.4%, the balance is Fe and unavoidable trace impurities; the depth of the chilled layer in the camshaft cam peach tip area made of this chilled cast iron is controlled at 7-10mm, and the hardness is controlled at 52-56HRC (within the range of 40 degrees at the tip of the peach); the depth of the cold shock layer in the cam transition zone is controlled at 5-8mm, and the hardness is controlled at 43-47HRC.

Embodiment 3

[0036] Embodiment 3: The chemical composition percentage of camshaft chilled cast iron is C 3.2%-3.4%; Si 2.3%-2.4%; Mn 0.7%-0.9%; P 0.9%-0.12%; S 0.7%-0.9%; Cu 0.2 % ~ 0.3%; Cr 0.2% ~ 0.3%, the balance is Fe and unavoidable trace impurities; the depth of the chilled layer in the camshaft cam peach tip area made of this chilled cast iron is controlled at 7-10mm, and the hardness is controlled at 56-60HRC (within the range of 40 degrees at the tip of the peach); the depth of the cold shock layer in the cam transition zone is controlled at 5-8mm, and the hardness is controlled at 45-47HRC.

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PUM

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Abstract

The invention discloses an engine camshaft chilled cast iron and a manufacturing method thereof, and the engine camshaft chilled cast iron is manufactured by the following steps: A. molding; B. batching: 50-55% of steel scrap, 8-12% of pig iron, 28-37% of foundry returns, 2.2% of carburant (graphite electrode), 0.45% of elements and iron alloy-copper, 3.2% of silicon iron and 0.85% of ferrochrome;C. melting: comprising the following substeps: a. adding the above ingredients according to a certain sequence in turn; b. melting liquid iron; c. superheating and standing; and d. inoculating; D: pouring the liquid iron obtained in the step C; E: cooling and opening a box; F: cleaning sand; and G: detecting camshaft parts. In the engine camshaft chilled cast iron of the invention, the depth andhardness of a chilled layer is effectively controlled and the wearing resistance, galling force resistance, adhesiveness resistance and anti-strip toughness are fine, thereby satisfying the requirements of high speed and high load and alternating exchange load, needing no subsequent quenching and hardening treatment, saving work time and lowering cost.

Description

technical field [0001] The invention relates to a chilled cast iron, in particular to an engine camshaft chilled cast iron. [0002] The present invention also relates to a method for manufacturing the chilled cast iron of the above-mentioned engine camshaft. Background technique [0003] The camshaft is one of the key components of the internal combustion engine, and is an important part of opening and closing the cylinder valve in the internal combustion engine. The wear resistance of the cam parts directly affects the performance of the internal combustion engine. When working, the cam working surface of the camshaft is in close contact with the top surface of the valve tappet, forming a pair of friction pairs. When the camshaft rotates at high speed, fatigue wear will occur on the working surface of the cam. When the wear exceeds a certain value, the valve clearance is too large, the valve opening time is delayed and incomplete, and the performance of the internal combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08B22D1/00B22D37/00F01L1/047
Inventor 徐志红陈磊韦家良
Owner SAIC-GM-WULING AUTOMOBILE CO LTD
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