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Sintered valve guide and manufacturing method thereof

A technology of valve guide and sintered alloy, which is applied in the field of sintered valve guide

Inactive Publication Date: 2009-07-22
SHOWA DENKO MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The valve guide material disclosed in Patent No. 2680927 shows excellent wear resistance, which is equivalent to that of the valve guide material in Japanese Patent Publication No. 55-34858. Although its machinability has been improved, it is still better than cast iron products. Difference

Method used

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  • Sintered valve guide and manufacturing method thereof
  • Sintered valve guide and manufacturing method thereof
  • Sintered valve guide and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Sample 1~27

[0064] With ore reduced iron powder (containing metal oxide 0.1 mass %) or atomized iron powder (containing metal oxide 0.2 mass %) as raw material iron powder, according to the mixing ratio described in table 1, raw material iron powder and iron-phosphorus Alloy powder, copper-tin alloy powder and graphite powder were mixed to prepare powder mixtures of samples 1-27, respectively. The overall composition of each powder blend sample is shown in Table 2. The particle sizes of various powders are as follows: Mineral reduced iron powder (greater than or equal to 150 μm: 5%, 45-150 μm: 75%, less than 45 μm: 20%), atomized iron powder (greater than or equal to 150 μm: 17%, 45-150 μm: 58%, less than 45 μm: 25%), iron-phosphorus alloy powder (greater than or equal to 63 μm: 3%, 45-63 μm: 10%, less than 45 μm: 87%), copper-tin alloy powder (greater than or equal to 150 μm : 7%, 45-150μm: 73%, less than 45μm: 20%), graphite powder (average particle size: 0.6-0.8m...

Embodiment 2

[0092] Sample 28~38

[0093] Using a powder mixture of the same composition as Sample 4 of Example 1, sintered body samples 28 to 31 were prepared by operations similar to that of Sample 4 (preparation of powder mixture, production of shaped body blanks, sintering and cooling), with the sintering temperature changed , as shown in Table 4, are 900°C (sample 28), 950°C (sample 29), 1050°C (sample 30), and 1100°C (sample 31), respectively. The overall composition of the powder mixture for each sample is shown in Table 5.

[0094] Also, sintered samples 32 to 36 were prepared by operations similar to sample 4 (preparation of mixture powder, manufacture of molded body blanks, sintering and cooling), but the sintering time was changed to 10 minutes (sample 32), 20 minutes (sample 33 ), 45 minutes (sample 34), 90 minutes (sample 35) and 120 minutes (sample 36).

[0095] In addition, sintered body samples 37 and 38 were prepared by operations similar to sample 4 (preparation of mixt...

Embodiment 3

[0115] Sample 39~49

[0116] Sintered body samples 39-42 were prepared from the powder mixtures of the samples listed in Table 7 according to the similar steps of sample 4 (preparation of powder mixture, manufacture of shaped body blanks, sintering and cooling), but contained oxides in the raw iron powder, respectively 0.2% by mass (scale reduced iron powder, sample 39), 0.5% by mass (sample 40), 1.5% by mass (sample 41), and 2.0% by mass (sample 42). The overall composition of the powder mixture for each sample is shown in Table 8.

[0117] Samples 43 to 49 were separately prepared, and the operation was basically the same as that of sample 4 (preparation of powder mixture, manufacture of shaped body blanks, sintering and cooling), except that part or all of the mineral reduced iron powder was atomized iron powder (oxide content: 0.2% by mass ), and its proportion to the total powder mixture is 5 mass % (sample 43), 10 mass % (sample 44), 15 mass % (sample 45), 20 mass % (sa...

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Abstract

The invention discloses a sintered valve guide made of sintered alloy. In terms of mass, sintered alloy copper: 3.5-5%, tin: 0.3-0.6%, phosphorus: 0.04-0.15%, carbon: 1.5-2.5%, iron : The balance, and as needed, contains 0.46 to 1.41% of metal oxides, and MnS and / or magnesium silicate. The composition of metallographic structure is: matrix composed of pearlite phase, Fe-P-C compound phase and Cu-Sn alloy phase, pores and dispersed graphite phase accounting for 1.2-1.7% of the mass ratio of sintered alloy. On the section, the pearlite phase accounts for 90% or more of the area of ​​the matrix alloy, the Fe-P-C compound phase accounts for 0.1-3% of the area, and the Cu-Sn alloy phase accounts for 1-3% of the cross-sectional area. In the Fe-P-C compound Those with a thickness greater than or equal to 15 μm account for less than or equal to 10% of the total Fe-P-C compound phase area.

Description

technical field [0001] The present invention relates to a valve guide for an internal combustion engine, and in particular, to a sintered valve guide made of a sintered alloy having excellent wear resistance and machinability, and a manufacturing method thereof. Background technique [0002] Valve guides made of cast iron have been used in internal combustion engines in the past, and recently, sintered alloy guides have been used due to their wear resistance and mass production. For example, the applicant of the present invention disclosed a sintered valve guide material excellent in wear resistance in Japanese Patent Publication No. 55-34858 and Japanese Patent No. 2680927. [0003] The composition of the valve guide material disclosed in Japanese Patent Publication No. 55-34858 is, by weight ratio, C: 1.5-4%, Cu: 1-5%, Sn: 0.1-2%, P: 0.1-0.3% , and Fe: the balance, its structure is that in the matrix formed by mixing pearlite and ferrite, there are iron-phosphorus-carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D9/00
CPCF01L3/08C22C38/002C22C33/0214C22C38/008B22F2999/00F01L2101/00C22C9/02B22F2998/00C22C33/0228F01L3/02C22C38/16F01L2301/00C22C33/0221B22F3/1028C22C33/0207B22F9/082B22F9/22C22C1/04B22F3/10
Inventor 近畑克直林幸一郎藤塚裕树坪井彻
Owner SHOWA DENKO MATERIALS CO LTD