Method for determining the machinability of a compacted graphite iron

A graphite cast iron, compact technology, applied in the direction of testing machinability, can solve the problems of high processing cost, low cutability, high procurement cost of compact graphite cast iron, and achieve the effect of high cost-effectiveness and elimination of errors

Inactive Publication Date: 2012-07-25
SCANIA CV AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, high levels of said carbide stabilizing species impart low cuttability and result in slow production and high processing costs
In addition, compacted graphite irons with a low content of carbide stabilizing substances are expensive, since cleaner scrap must be used, resulting in high procurement costs for compacted graphite irons

Method used

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  • Method for determining the machinability of a compacted graphite iron
  • Method for determining the machinability of a compacted graphite iron
  • Method for determining the machinability of a compacted graphite iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0097] The invention is described below for two specific experiments carried out using the relationship derived and measurements on actual materials.

[0098] test 1

[0099]The first experiment compared the measured tool life with that calculated according to Equation 3.

[0100] Tool life calculations for the respective samples 1-19 were performed by substituting the contents of carbide-stabilizing species Mo, Cr and Mn into Equation 3. The calculated tool life was then compared with the tool life measured for the respective samples (see Table 1). Figure 6 A very good match between calculated and measured tool life is shown.

[0101] test 2

[0102] The second experiment used two independent sample series to compare the measured tool life with the tool life calculated according to Equation 7.

[0103] The above set of sample materials 1-9 (see Table 1) was supplemented with four more sample materials of the second series designated 20-23.

[0104] Sample material 2...

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PUM

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Abstract

Method for determining the cuttability of a compact graphite iron, characterised by the steps of: - arriving at a relationship between cuttability and contents of carbide-stabilising substances in compact graphite iron, which relationship is arrived at empirically from measured cuttability and measured contents of carbide-stabilising substances in a plurality of test pieces of compact graphite iron; - providing a compact graphite iron; - determining the contents of carbide-stabilising substances in the compact graphite iron provided; - determining a value for the cuttability of the compact graphite iron provided on the basis of the relationship and contents of carbide-stabilising substances in the compact graphite iron provided.

Description

technical field [0001] The invention relates to a method for determining the cuttability of compact graphite cast iron according to the preamble of claim 1 . Background technique [0002] The automotive industry faces an ever-increasing demand for more efficient engines with low emissions. One way to achieve cleaner combustion is through the use of higher combustion pressures in diesel engines, but this requires stricter material requirements for the block and head. The strength properties of gray cast iron, the traditional dominant material, are insufficient to cope with the loads that the material will be subjected to in future generations of diesel engines. As a result, many operators within the automotive industry are switching to compact graphite cast iron instead for use in diesel engines. Compact graphite cast iron (abbreviated as CGI) has at least 45%-75% more rigidity and twice the fatigue strength than gray cast iron. Various automakers already produce engine pa...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/00
CPCC22C37/04C22C37/10G01N3/58
Inventor K·克里瑙F·维尔贝弗斯J·埃斯比约内
Owner SCANIA CV AB
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