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Casting technology of valve seat ring

A valve seat ring and casting process technology, applied in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of easy wear, aggravation, valve-valve seat ring pair failure, etc., to increase toughness and accelerate water evaporation. , The effect of preventing bending

Inactive Publication Date: 2015-07-29
ANHUI TONGFENG RUBBER & PLASTIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valve seat ring works under high stress (the maximum combustion pressure of the engine can reach 20MPa, the spring force and dynamic load pressure can reach 130MPa), high temperature (the working temperature of the intake valve is generally 200°C-450°C, and the working temperature of the exhaust valve is generally In the harsh environment of 600°C-800°C, some even as high as 850°C) and corrosion (high temperature gas erosion, vulcanization, V2O5 corrosion and oxidation), wear is prone to occur, and the assembly error of the valve and the rotation when opening and closing , which aggravates this wear, and excessive wear will cause the valve-valve seat pair to fail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A casting process for a valve seat, characterized in that the steps include:

[0021] (1) The raw materials used in the casting of the valve seat include: iron 60kg, 300 mesh zircon powder 1.2kg, calcium-based bentonite and water 1.5kg, 0.5kg and 2000ml respectively, 0.5kg of carbon is added to the raw materials, and the raw materials are mixed evenly Melting at 1500°C;

[0022] (2) Use a copper brush to remove the rust spots on the inner cavity of the mold, clean it with lye, the lye used is a 1.5mol / L caustic soda solution, remove the oil on the inner wall of the mold, and dry the mold with compressed air. The air pressure is 3.5Mpa;

[0023] (3) Install asbestos pads and front and rear retaining rings;

[0024] (4) Hoist the mold on the main machine, adjust the level of the mold, and paint the interior of the mold, the paint used is polytetrafluoroethylene;

[0025] (5) Turn on the machine and adjust the speed of the mold to 50r / min, ignite and heat the mold, when...

Embodiment 2

[0030] A casting process for a valve seat, characterized in that the steps include:

[0031] (1) The raw materials used in the casting of the valve seat include: 70kg of iron, 1.2kg of 350 mesh zircon powder, 1.5kg of calcium-based bentonite and 2300ml of water, respectively, 0.5kg of carbon is added to the raw materials, and the raw materials are mixed evenly Melting at 1500°C;

[0032] (2) Use a copper brush to remove the rust spots on the inner cavity of the mold, clean it with lye, the lye used is a 1.5mol / L caustic soda solution, remove the oil on the inner wall of the mold, and dry the mold with compressed air. The air pressure is 3.5Mpa;

[0033] (3) Install asbestos pads and front and rear retaining rings;

[0034] (4) Hoist the mold on the main machine, adjust the level of the mold, and paint the interior of the mold, the paint used is polytetrafluoroethylene;

[0035] (5) Turn on the machine and adjust the speed of the mold to 70r / min, ignite and heat the mold, wh...

Embodiment 3

[0040] A casting process for a valve seat, characterized in that the steps include:

[0041] (1) The raw materials used in the casting of the valve seat include: iron 80kg, 350 mesh zircon powder 1.8kg, calcium-based bentonite and water respectively 2kg, 0.8kg and 2500ml, add carbon 0.5kg to the raw materials, mix the raw materials evenly in Melting at 1500°C;

[0042] (2) Use a copper brush to remove the rust spots on the inner cavity of the mold, clean it with lye, the lye used is a 1.5mol / L caustic soda solution, remove the oil on the inner wall of the mold, and dry the mold with compressed air. The air pressure is 3.5Mpa;

[0043] (3) Install asbestos pads and front and rear retaining rings;

[0044] (4) Hoist the mold on the main machine, adjust the level of the mold, and paint the interior of the mold with polytetrafluoroethylene;

[0045] (5) Turn on the machine and adjust the speed of the mold to 70r / min, ignite and heat the mold, when the temperature of the mold re...

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Abstract

The invention discloses a casting technology of a valve seat ring. 0.5 kg of carbon is added to a raw material during casting, thus, for iron with the carbon added, the toughness of the iron can be enhanced while the rigidity of the iron is guaranteed, and the condition that the iron is bent due to excessive brittleness is prevented; the melting temperature of the raw material is 1500 DEG C and is higher than the melting temperature of the iron, so that on one hand, the iron is ensured to be molten, and on the other hand, the melting of the iron is accelerated; a cast is blow-dried with compressed air under the air pressure of 3.5 Mpa, and the impact force of the compressed air can accelerate moisture evaporation on one hand and can remove impurities on the surface of the cast on the other hand; a used alkaline solution is a 1.5 mol / L caustic soda solution which can remove rust and oil stains on the surface of the cast powerfully; a coating adopted by the cast is polytetrafluoroethylene, and the coating can facilitate separation of the seat ring from the cast after the seat ring is finished.

Description

technical field [0001] The invention relates to the field of disposable paper cup production, in particular to a casting process of a valve seat ring. Background technique [0002] Valve seat processing cylinder head is one of the main parts of the engine, its machining accuracy has a great influence on the performance of the engine, and its performance and wear resistance affect the fuel consumption, power, efficiency and even life of the engine. The valve seat ring works under high stress (the maximum combustion pressure of the engine can reach 20MPa, the spring force and dynamic load pressure can reach 130MPa), high temperature (the working temperature of the intake valve is generally 200°C-450°C, and the working temperature of the exhaust valve is generally In the harsh environment of 600°C-800°C, some even as high as 850°C) and corrosion (high temperature gas erosion, vulcanization, V2O5 corrosion and oxidation), wear is prone to occur, and the assembly error of the val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C3/00B22C9/12
Inventor 项宗武
Owner ANHUI TONGFENG RUBBER & PLASTIC IND
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