Machining technique for valve seat ring

Abstract

The invention discloses a machining technique for a valve seat ring. The machining technique comprises the following machining steps that (1) preparation is carried out: raw materials are fed and pressurized on an oil press in cooperation with a semi-automatic formwork; (2) pressing is carried out: a base layer is pressed, and the height of the base layer is controlled; then an infiltration layer is pressed, and finally demolding is carried out; (3) firing is carried out: after demolding, a sintering furnace is used for sintering and infiltration, and a blank is formed through pre-firing, sintering and infiltration; (4) finish machining is carried out: the blank is directly machined, finish turning of the inner face and the outer face is carried out, and the outer circle and a cross section are finally ground; (5) detection is carried out: a finished product is subjected to quenching, then defective items are removed, and the finished product is polished. According to the machining method of the valve seat ring, the valve seat ring is made of powered metal materials; the strength of the valve seat ring can be improved through pressing preparation on the two sides, and the density and the hardness of the base layer can be controlled when the base layer is pressed; heat resistance and thermal impact resistance of the valve seat ring can also be improved, and machining performance is improved.

Description

technical field

[0001] The invention relates to the field of engines, in particular to a processing technology for a valve seat ring. Background technique

[0002] The valve seat of the automobile engine is an important part of the engine. It is the portal for the air to enter when the fuel of the internal combustion engine is burned and the exhaust gas to be discharged after combustion. Its main purpose is to ensure the sealing of the combustion chamber. Due to the harsh working conditions, it is necessary to withstand the impact and wear of the valve in a high temperature environment, as well as the erosion and oxidation of the intake and exhaust flow. Therefore, the high temperature resistance, wear resistance and oxidation resistance of the valve seat ring have extremely high requirements. With the development of science and technology, people have more and more stringent requirements on the engine valve seat, and hope that the valve seat has higher heat resistance, wea...

Examples

Embodiment 1

[0017] A processing technology for a valve seat ring, including the following process steps: (1), preparation: put raw materials on a hydraulic press with a semi-automatic formwork for feeding and pressing; (2), pressing: press the base layer and control the height of the base layer , then press the immersion layer, and finally demould; (3), firing: after demoulding, sinter and immerse with a sintering furnace, and form a blank through pre-sintering, sintering, and immersion respectively; (4), finishing: The blank is directly machined, the inner and outer surfaces are fine-turned, and the outer circle and cross-section are finally ground; (5) Inspection: quench the finished product, remove defective products, and polish the finished product. Preferably, the step (1) is carried out twice after feeding and pressurizing respectively. Preferably, the immersion layer in the step (2) is 5% more than the theoretical value. Preferably, the step (3) is carried out under the protection...

Embodiment 2

[0019] The rest are the same as in Example 1, except that the immersion layer in the step (2) is 4% more than the theoretical value; step (5) is subjected to heat preservation treatment for 15 minutes before quenching, and the number of times of quenching is 5 times.

Embodiment 3

[0021] The rest are the same as in Example 1, except that the immersion layer in the step (2) is 6% more than the theoretical value; the heat preservation treatment is carried out for 10 minutes before the step (5) quenching, and the number of times of quenching is 4 times.

[0022] After the above process steps, the sample of the valve seat is taken out, which is well-made and installed on the engine, which improves the working efficiency of the engine, and the product of embodiment 2 has the best quality after installation and the longest service life.

technical field

[0001] The invention relates to the field of engines, in particular to a processing technology for a valve seat ring. Background technique

[0002] The valve seat of the automobile engine is an important part of the engine. It is the portal for the air to enter when the fuel of the internal combustion engine is burned and the exhaust gas to be discharged after combustion. Its main purpose is to ensure the sealing of the combustion chamber. Due to the harsh working conditions, it is necessary to withstand the impact and wear of the valve in a high temperature environment, as well as the erosion and oxidation of the intake and exhaust flow. Therefore, the high temperature resistance, wear resistance and oxidation resistance of the valve seat ring have extremely high requirements. With the development of science and technology, people have more and more stringent requirements on the engine valve seat, and hope that the valve seat has higher heat resistance, wea...

Examples

Embodiment 1

[0017] A processing technology for a valve seat ring, including the following process steps: (1), preparation: put raw materials on a hydraulic press with a semi-automatic formwork for feeding and pressing; (2), pressing: press the base layer and control the height of the base layer , then press the immersion layer, and finally demould; (3), firing: after demoulding, sinter and immerse with a sintering furnace, and form a blank through pre-sintering, sintering, and immersion respectively; (4), finishing: The blank is directly machined, the inner and outer surfaces are fine-turned, and the outer circle and cross-section are finally ground; (5) Inspection: quench the finished product, remove defective products, and polish the finished product. Preferably, the step (1) is carried out twice after feeding and pressurizing respectively. Preferably, the immersion layer in the step (2) is 5% more than the theoretical value. Preferably, the step (3) is carried out under the protection...

Embodiment 2

[0019] The rest are the same as in Example 1, except that the immersion layer in the step (2) is 4% more than the theoretical value; step (5) is subjected to heat preservation treatment for 15 minutes before quenching, and the number of times of quenching is 5 times.

Embodiment 3

[0021] The rest are the same as in Example 1, except that the immersion layer in the step (2) is 6% more than the theoretical value; the heat preservation treatment is carried out for 10 minutes before the step (5) quenching, and the number of times of quenching is 4 times.

[0022] After the above process steps, the sample of the valve seat is taken out, which is well-made and installed on the engine, which improves the working efficiency of the engine, and the product of embodiment 2 has the best quality after installation and the longest service life.