Preparation process of high-quality diesel engine bearing cover

Abstract

The invention discloses a preparation process of a high-quality diesel engine bearing cover. After spheroidizing and inoculating treatment are performed on base iron for a period of time, secondary silicon carbide and a secondary inoculant are added; the purity of the secondary silicon carbide is limited to be 95 percent or above; graphitization is promoted in the base iron through rare earth metal lanthanum and magnesium in a spheroidizing agent and a silicon-barium inoculant, and graphite nucleation is formed; silicon carbide with the purity being 95 percent or above is added; the dendritic crystals of austenite in the molten iron can be micronized; the micronized austenite dendritic crystals can increase graphite cores formed among the dendritic crystals; and the number of graphite nodules in the molten iron is increased, and the spheroidization rate is increased. The engine bearing cover prepared by the preparation process is processed by using a proper formula and adjusting the element proportion, and the bearing cover with good spheroidization rate and mechanical property is obtained by adopting a processing technology of secondarily adding silicon carbide and the inoculant, so that the engine bearing cover has good practicability and production value.

Description

technical field

[0001] The invention relates to the technical field of cast iron, in particular to a preparation process of a high-quality diesel engine bearing cover. Background technique

[0002] Ductile iron is a cast iron material developed in the 1950s. The performance of ductile iron is close to that of steel. "Replacing steel with iron" refers to ductile iron, because ductile iron is spheroidized Compared with inoculated spherical graphite, spherical graphite has less splitting effect on the metal matrix, so the metal matrix is ​​relatively continuous, which improves the plasticity and toughness of cast iron, and can be used for components with more complex forces.

[0003] The engine bearing cover is one of the products of ductile iron. The function of the bearing cover is to protect the interior from being polluted by external dust, to prevent the internal oil from overflowing, and to protect the internal vulnerable parts from being damaged. This requires the bearin...

Examples

Embodiment 1

[0059] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0060] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0061] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0062] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0063] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0064] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0065] Among them, S1:

[0066] Put the cast iron raw material in a melting furnace, heat it to 1580°C, melt all ...

Embodiment 2

[0089] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0090] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0091] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0092] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0093] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0094] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0095] Among them, S1:

[0096] Place the cast iron raw material in a melting furnace, heat it to 1590°C, melt al...

Embodiment 3

[0119] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0120] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0121] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0122] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0123] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0124] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0125] Among them, S1:

[0126] Put the cast iron raw material in a melting furnace, heat it to 1600°C, melt all ...

technical field

[0001] The invention relates to the technical field of cast iron, in particular to a preparation process of a high-quality diesel engine bearing cover. Background technique

[0002] Ductile iron is a cast iron material developed in the 1950s. The performance of ductile iron is close to that of steel. "Replacing steel with iron" refers to ductile iron, because ductile iron is spheroidized Compared with inoculated spherical graphite, spherical graphite has less splitting effect on the metal matrix, so the metal matrix is ​​relatively continuous, which improves the plasticity and toughness of cast iron, and can be used for components with more complex forces.

[0003] The engine bearing cover is one of the products of ductile iron. The function of the bearing cover is to protect the interior from being polluted by external dust, to prevent the internal oil from overflowing, and to protect the internal vulnerable parts from being damaged. This requires the bearin...

Examples

Embodiment 1

[0059] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0060] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0061] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0062] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0063] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0064] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0065] Among them, S1:

[0066] Put the cast iron raw material in a melting furnace, heat it to 1580°C, melt all ...

Embodiment 2

[0089] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0090] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0091] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0092] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0093] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0094] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0095] Among them, S1:

[0096] Place the cast iron raw material in a melting furnace, heat it to 1590°C, melt al...

Embodiment 3

[0119] A preparation process for a high-quality diesel engine bearing cover, comprising the following steps:

[0120] S1: Put the raw material in the melting furnace, melt it into molten iron at high temperature, and add silicon carbide once to obtain the original molten iron;

[0121] S2: Place small scrap iron 1, dry iron filings 2, primary inoculant 3, and nodulizer 4 in the nodular iron bag in sequence, and compact them;

[0122] S3: Pour the original molten iron into the ductile iron ladle, spheroidize and incubate for a period of time, add secondary silicon carbide and secondary inoculant to obtain ductile iron;

[0123] S4: Pouring spherical graphite molten iron into the bearing cap mold to obtain the original casting of the bearing cap;

[0124] S5: The original casting of the bearing cap is subjected to heat treatment to obtain the engine bearing cap.

[0125] Among them, S1:

[0126] Put the cast iron raw material in a melting furnace, heat it to 1600°C, melt all ...

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