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Iron-based mixed powder and iron powder sintered body for powder metallurgy

A mixed powder and powder metallurgy technology, applied in the field of iron-based mixed powder and iron powder sintered body for powder metallurgy, can solve the problems of environmental pollution and strength reduction, and achieve improved tool life, strength will not decrease, good cutting sexual effect

Inactive Publication Date: 2012-02-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Machinability is improved due to the lubricating effect of this free graphite, but there is a problem that the strength decreases due to the suppression of carburization
[0013] In addition, in the addition of MnS, which is generally used to improve machinability, there is a problem of so-called contamination of the working environment due to S, and a problem of the so-called cause of a decrease in strength.

Method used

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  • Iron-based mixed powder and iron powder sintered body for powder metallurgy
  • Iron-based mixed powder and iron powder sintered body for powder metallurgy
  • Iron-based mixed powder and iron powder sintered body for powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0083] To the iron powder with the composition shown in Table 1, 0.8% by mass of graphite powder, 2.0% by mass of Cu powder, a predetermined amount of oxide powder shown in Table 2 (refer to Table 3), and 0.75% by mass of iron powder were added. Zinc fatty acid was used as a lubricant and mixed for 60 minutes using a V-type mixer to prepare iron-based mixed powder for powder metallurgy. Next, the iron-based mixed powder for powder metallurgy is molded to form a ring-shaped compact with an outer diameter of 64 mm, an inner diameter of 24 mm, and a height of 20 mm. The compacted powder was sintered for 30 minutes under the conditions. Adjust the forming pressure during forming so that the density of the sintered body reaches 6.8~6.85g / cm 3 .

[0084] It should be noted that the melting point of the oxides in Table 2 uses state diagrams, and the viscosity of the liquid phase mainly uses literature values.

[0085] [Table 1]

[0086] C (mass%)

Si (mass%)

Mn (m...

no. 2 Embodiment

[0105] Next, in order to investigate the influence of the content of graphite powder, the addition amount of graphite powder (the addition amount of C) was set to 0.4 mass%, 0.6 mass% or 0.8 mass%, and the addition amount of the composite oxide was set to no addition or 0.3 mass% to test. In addition, the preparation method of the sintered body and the evaluation method of strength and machinability are the same as those of the above-mentioned first embodiment. However, in the second example, the pass judgment criteria of strength and machinability are not specifically defined for the test of investigating the influence of the graphite powder content.

[0106] These test results are shown in Table 4 (Test Nos. 1 to 6).

[0107] [Table 4]

[0108]

[0109] * The type of oxide corresponds to No. 5 or 9 in Table 2.

[0110] As shown in Table 4, when the addition amount of the graphite powder was any one of 0.4 mass%, 0.6 mass%, and 0.8 mass%, the machinability was improved...

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Abstract

The invention relates to an iron-based mixed powder for powder metallurgy, which is an iron-based mixed powder for powder metallurgy containing iron-based powder, graphite powder, Cu powder and a composite oxide, and the composite oxide has 105 (poise) at 800°C For the following viscosity, the content of the composite oxide is 0.05 to 1.5% by mass relative to the total mass of the mixed powder. According to the iron-based mixed powder for powder metallurgy of the present invention, an iron powder sintered body with improved machinability can be obtained without lowering the strength. In addition, in the iron powder sintered body, since the composite oxide contained in the iron powder sintered body melts during cutting to exert a lubricating effect, tool wear can be suppressed and tool life can be improved.

Description

technical field [0001] The present invention relates to an iron-based mixed powder and an iron powder sintered body for powder metallurgy, and in particular to an iron-based mixed powder and an iron powder sintered body for powder metallurgy capable of obtaining an iron powder sintered body suitable as a high-strength sintered part for automobiles. Background technique [0002] For powder metallurgy, which presses and shapes metal powder in a metal mold, and then sinters it to form a sintered body, mechanical parts with complex shapes can be manufactured with high precision. Therefore, gears that require high dimensional accuracy It can be widely used in the manufacture of automobile parts and so on. [0003] In reality, due to the constraints of press molding using a metal mold, some kind of machining is performed in the final process for various sintered parts. However, it was confirmed that the machinability of the sintered part was inferior to that of the sintered mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C33/02C22C38/00
CPCC22C33/0228
Inventor 工藤高裕古田智之谷口祐司
Owner KOBE STEEL LTD
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