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Method for preparing graded pressurization liquid forging aluminum alloy engine cylinder cover

An engine cylinder head and liquid die forging technology, which is applied in the field of aluminum alloy for automobiles, can solve the problems of cracks, uneven structure, material waste and other problems in cast aluminum alloy cylinder head, and achieve the elimination of casting defects, uniform structure and improved quality The effect of stability

Active Publication Date: 2015-11-25
阜新申泰汽车部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for preparing a cylinder head of an aluminum alloy engine cylinder head with graded pressurization, the purpose of which is to solve the problems of easy cracks, waste of materials, uneven structure and existence of castings in cast aluminum alloy cylinder heads. defects and other problems, improve the yield of the cylinder head, and improve the comprehensive mechanical properties of the cylinder head

Method used

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  • Method for preparing graded pressurization liquid forging aluminum alloy engine cylinder cover

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Embodiment 1

[0018] The preparation method of the staged pressurized liquid die forging aluminum alloy engine cylinder head of this embodiment is carried out according to the following steps:

[0019] (1) Install the upper and lower molds of the engine cylinder head on the die forging machine, preheat the lower mold to 300°C, preheat the upper mold to 280°C, and brush the release agent inside the upper and lower molds;

[0020] (2) Heat the 6063 aluminum alloy to 750°C to melt, and keep it for 1 hour for refining;

[0021] (3) Pour the molten aluminum alloy into the lower mold, and pressurize for the first time when the temperature of the aluminum alloy liquid drops to 690°C. The pressurized pressure is 2000t, and pressurize until the aluminum alloy liquid is still 1mm short of filling the mold cavity Stop, pressurization time is 5 seconds;

[0022] (4) When the temperature of the aluminum alloy liquid drops to 650°C, carry out secondary pressurization, and the aluminum alloy liquid fills...

Embodiment 2

[0025] (1) Install the upper and lower molds of the engine cylinder head on the die forging machine, preheat the lower mold to 320°C, preheat the upper mold to 260°C, and brush the release agent inside the upper and lower molds;

[0026] (2) Heat the 6063 aluminum alloy to 740°C to melt and keep it warm for 1 hour for refining;

[0027] (3) Pour the molten aluminum alloy into the lower mold, and pressurize for the first time when the temperature of the aluminum alloy liquid drops to 680°C. The pressurized pressure is 2000t, and pressurize until the aluminum alloy liquid is less than 1mm full of the mold cavity. Stop, pressurization time is 5 seconds;

[0028] (4) When the temperature of the aluminum alloy liquid drops to 585°C, carry out secondary pressurization, and the aluminum alloy liquid fills the mold cavity and maintains the pressure for 20 seconds;

[0029] (5) After the pressure holding is completed, the pressure is removed, and the cylinder head is taken out for wat...

Embodiment 3

[0031] (1) Install the upper and lower molds of the engine cylinder head on the die forging machine, preheat the lower mold to 310°C, preheat the upper mold to 270°C, and brush the release agent inside the upper and lower molds;

[0032] (2) Heat the 6063 aluminum alloy to 760°C to melt, and keep it for 1 hour for refining;

[0033] (3) Pour the molten aluminum alloy into the lower mold, and pressurize for the first time when the temperature of the aluminum alloy liquid drops to 685°C. The pressurized pressure is 2000t, and pressurize until the aluminum alloy liquid is less than 1mm full of the mold cavity. Stop, pressurization time is 5 seconds;

[0034] (4) When the temperature of the aluminum alloy liquid drops to 600°C, carry out secondary pressurization, and the aluminum alloy liquid fills the mold cavity and maintains the pressure for 20 seconds;

[0035] (5) After the pressure holding is completed, the pressure is removed, and the cylinder head is taken out for water q...

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Abstract

The invention belongs to the technical field of aluminum alloy used for vehicles and particularly relates to a method for preparing a graded pressurization liquid forging aluminum alloy engine cylinder cover. The method comprises the steps that 6063 aluminum alloy is refined; the molten aluminum alloy is poured into a lower die body of a die; when the temperature of the molten aluminum alloy is lowered to 680 DEG C-690 DEG C, the first time of pressurization is conducted, and the pressurization is stopped when the liquid level of the molten aluminum alloy is 1 mm lower than the edge of a die cavity; the pressurization is conducted for 5 seconds; when the temperature of the molten aluminum alloy is lowered to 585 DEG C-650 DEG C, the second time of pressurization is conducted; after the die cavity is filled with the molten aluminum alloy, the pressure is maintained for 20 seconds, and the pressure is relieved after the pressure maintaining is finished; the cylinder cover is taken out for being subjected to water quenching and heat treatment, and the graded pressurization liquid forging aluminum alloy engine cylinder cover is obtained; the tensile strength of the cylinder cover is equal to or higher than 400 MPa, and the elongation percentage of the cylinder cover is equal to or higher than 11.5%. According to the method, high comprehensive mechanical properties of the cylinder cover are guaranteed through the graded pressurization, and the quality stability of the cylinder cover is improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys for automobiles, and in particular relates to a method for preparing a cylinder head of an aluminum alloy engine cylinder head with graded pressurization liquid die forging. Background technique [0002] The cylinder head of automobile engine is usually made of cast iron, but the cast iron is heavy, which is not conducive to the development requirements of automobile lightweight, and the heat dissipation performance is not good, so it has been gradually replaced by aluminum alloy in recent years. Aluminum alloy cylinder heads are usually prepared by casting. Casting aluminum alloy cylinder heads has some disadvantages: due to the complex shape of the engine cylinder head, there are large shape mutations and uneven thickness. Cracks will occur everywhere; castings should reserve gates and risers, and gates and risers must be removed in subsequent machining, resulting in waste of alloys and ...

Claims

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Application Information

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IPC IPC(8): B22D18/02
Inventor 刘民孙跃军王志峰迟长志
Owner 阜新申泰汽车部件有限公司
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