Cylinder Head PM Sintered Part

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A kind of engine cylinder head powder metallurgy preparation method

【Technical field】

[0001] The present invention relates to the field of preparation of automobile engine parts, in particular to a powder metallurgy preparation method for a cylinder head of an engine.

【Background technique】

[0002] Powder metallurgy is to produce metal powder or use metal powder (or a mixture of metal powder and non-metallic powder) as raw material, after forming and sintering, to produce metal materials, composite materials and various types of industrial technology. At present, powder metallurgy technology has been widely used in transportation, machinery, electronics, aerospace, weapons, biology, new energy, information and nuclear industries, and has become one of the most dynamic branches of new material science. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is very suitable for mass production. In addition, some materials and complex parts that cannot be prepared by traditional casting methods and machining methods can also be manufactured by powder metallurgy technology, so they have attracted the attention of the industry.

In the prior art, the production of iron powder adopts reduction method, atomization method, mechanical pulverization method, electrolysis method more, and the operation process of these metallurgical methods is complex and loaded down with trivial details, and production process is extremely difficult to control, and produces iron powder in production The efficiency is not high, the purity of the iron powder produced is low, and there are a large amount of non-ferrous metal impurities such as copper and molybdenum in it. These precious non-ferrous metals contained in the iron powder cannot be rationally utilized, and iron powder with reduced metals is still obtained. performance, and the cost of metallurgical methods in the prior art is relatively high.

【Content of invention】

Summary of the invention To the above problems, the object of this invention is to provide a kind of engine cylinder head powder metallurgy preparation method, powder metallurgy method can guarantee the correctness and uniformity of material composition ratio, can greatly reduce production cost.

Technical scheme of the present invention is as follows:

A kind of cylinder head powder metallurgy preparation method for engine comprises following operation steps:

1), raw material is prepared, is made up of the raw material of following weight portion: iron powder 84-86, copper powder 2.2-3.3, graphene 0.4-0.7, zinc stearate 3.3-3.5, aluminum powder 0.5-1.2, Tantalum carbide 0.4-0.5, silicon nitride 0.4-0.6, Mg⑶ 31.2-1.5, Al2O3 1.2-1.4, Co0.2-0.4, carbon powder 0.1-0.12, zirconium dioxide 0.3-0.6, dispersant 2.5-3;

2), above-mentioned raw material powder is put into mould, raw material powder mixes and stirs evenly after 50-55 minute at 55-60 ℃, under the pressure of 60-65MPa, be pressed into the blank of preset shape for subsequent use;

3), sintering 2.5 ~ 3.5h in vacuum sintering furnace, vacuum degree-0.18 ~ 0.23Pa, sintering furnace temperature 1000 DEG C ~ 1050 DEG C, be warming up to 930- with 12-15 DEG C/ minute rate Sinter at 1000°C for 2-2.2 hours, then cool down to 500-530°C at a rate of 5-7°C/min and keep warm for 1-1.5 hours, and finally send the compact to 100-120°C to cool for 50 -60 minutes;

4), in heat treatment step, adopt heat treatment furnace to heat, heating temperature 650 ℃ ± 10 ℃, heat treatment time 1 ~ 1.4 hours, then enter oil tank and fire, oil temperature 70-90 ℃, send after cooling Put it into the tempering furnace and temper for 2~2.2 hours, the tempering temperature is 250°C ± 10°C, and then send the product out to obtain.

Carry out surface treatment step after described tempering treatment, carburizing agent is sent in carburizing furnace, in 1120-1200 DEG C temperature range, carburizing treatment 110-130min.

Beneficial effect of the present invention:

1, because powder metallurgy process does not melt material in material production process, also just be afraid of being mixed with the impurity that brings by crucible and deoxidizer etc., and sintering is generally carried out in vacuum and reducing atmosphere, is not afraid of oxidation, also It will not give any pollution to the material, so it is possible to produce high-purity materials; 2. The powder metallurgy method can ensure the correctness and uniformity of the material composition ratio; 3. Powder metallurgy is suitable for producing products with the same shape and a large number. Especially for products with complex shapes and high processing costs, the production cost can be greatly reduced by powder metallurgy.
 

【Detailed ways】

Embodiment Below in conjunction with specific embodiment, further set forth the present invention, should be understood that these embodiments are only for illustrating the present invention

A kind of cylinder head powder metallurgy preparation method for engine comprises following operation steps:

1), raw material is prepared, is made up of the raw material of following weight portion: iron powder 84-86, copper powder 2.2-3.3, graphene 0.4-

0.7, zinc stearate 3.3-3.5, aluminum powder 0.5-1.2, tantalum carbide 0.4-0.5, silicon nitride 0.4-0.6, Mg⑶ 31.2-1.5, Al2O3 1.2-1.4, Co0.2-0.4, carbon powder 0.1 -0.12, zirconium dioxide 0.3-0.6, dispersant 2.5-3;

2), above-mentioned raw material powder is put into mould, raw material powder mixes and stirs after 50-55 minute at 55-60 ℃, under the pressure of 60-65MPa, be pressed into the blank of preset shape for subsequent use;

3), in vacuum sintering furnace, sintering 2.5 ~ 3.51 l, vacuum degree-0.18 ~ -0.23 ° C, sintering furnace temperature 1000 ° (3 ~ 1050 ° C, with 12-15 ° C / minute rate is warming up to 930 Sinter at -1000°C for 2-2.2 hours, then cool down at a rate of 5-7°C/min to 500-530°C and hold for 1-1.5 hours, and finally send the compact to 100-120°C for cooling 50-60 minutes;

4), in heat treatment step, adopt heat treatment furnace to heat, heating temperature 650 ℃ ± 10 ℃, heat treatment time 1 ~ 1.4 hours, then enter oil tank and fire, oil temperature 70-90 ℃, send after cooling Temper in the tempering furnace for 2 to 2.2 hours, the tempering temperature is 250 ° C ± 10 ° C, after the tempering treatment, the surface treatment step is carried out, and the carburizing agent is sent into the carburizing furnace, within the temperature range of 1120 ~ 1200 ° C Carburizing treatment for 110~130min, and then send out the product.

According to the cylinder head material that the present invention makes, experimental data is as follows:

Tensile strength ob (MPa): > 1020, yield strength Os (MPa): 2950, elongation δ5 (%): > 11.5, reduction of area force (%): 245.6, impact power δ1 ^(1):2 61.2, impact toughness value €[1^(1/0112):2 62.

【Sovereignty item】

1. A cylinder head powder metallurgy preparation method for engine, is characterized in that: comprise following operation steps: 1), raw material preparation, is made up of the raw material of following weight part: iron powder 84-86, copper powder 2.2-3.3, graphite Alkene 0.4-0.7, zinc stearate 3.3-3.5, aluminum powder 0.5-1.2, tantalum carbide 0.4-0.5, silicon nitride 0.4-0.6, MgC031.2-1.5, Al2O3I.2-1.4, Co0.2-0.4, Carbon powder 0.1-0.12, zirconium dioxide 0.3-0.6, dispersant 2.5-3; 2), above-mentioned raw material powder is put into mould, raw material powder mixes and stirs after 50-55 minute at 55-60 ℃, after 60 3) Sinter in a vacuum sintering furnace for 2.5~3.5h, vacuum degree -0.18~0.23Pa, sintering furnace temperature 1000°C~1050°C, with 12-15°C/min rate of heating to 930-1000°C for sintering for 2-2.2 hours, then cooling to 500-530°C at a rate of 5-7°(3/min) for 1-1.5 hours, and finally The compact is sent into 100-120°C for cooling for 50-60 minutes; 4), in the heat treatment step, use a heat treatment furnace to heat, the heating temperature is 650°C ± 10°C, and the heat treatment time is 1 ~ 1.4 hours, then enter the oil tank Haggard fire, the oil temperature is 70-90°C, after cooling, send it to the tempering furnace for tempering for 2 to 2.2 hours, the tempering temperature is 250°C±10°C, and then send the product out to get ready. 2. the cylinder head powder metallurgy preparation method for engine according to claim 1, is characterized in that: carry out surface treatment step after described tempering treatment, carburizing agent is sent in carburizing furnace, at 1120 ~ 1200 ℃ Carburizing treatment within the temperature range 110~130mino

【Patent Abstract】The present invention discloses a powder metallurgy preparation method for engine cylinder head, which includes the following steps: raw material preparation, which consists of the following raw materials in parts by weight: iron powder 84-86, copper powder 2.2-3.3, graphene 0.4-0.7, zinc stearate 3.3-3.5, aluminum powder 0.5-1.2, tantalum carbide 0.4-0.5, silicon nitride 0.4-0.6, MgCO31.2-1.5, Al2O31.2-1.4, Co0.2-0.4, carbon Powder 0.1-0.12, zirconium dioxide 0.3-0.6, dispersant 2.5-3. The cylinder head of the invention has excellent mechanical properties, and the powder metallurgy method can ensure the correctness and uniformity of the distribution ratio of the material components, and can greatly reduce the production cost.

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