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Semi-molten micro-pressure die casting preparation method for small-and-medium-sized zinc base alloy shaft sleeve

A small and medium-sized zinc-based technology, applied in the field of preparation of small and medium-sized zinc-based shaft products, can solve the problems of composition segregation, shrinkage, shrinkage at the bottom of castings, etc., achieving low cost, improved mechanical properties and wear resistance, The effect of dense tissue

Inactive Publication Date: 2019-01-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to provide a semi-molten state micro-die casting preparation method suitable for the production of small and medium-sized zinc-based alloy bushings, so as to solve the problem of shrinkage cavities and porosity at the bottom of the casting when the casting method is used to produce small-sized zinc-based alloy bushings. and component segregation problems, while improving the mechanical properties and wear-reducing and wear-resisting properties of small zinc-based alloy bushings

Method used

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  • Semi-molten micro-pressure die casting preparation method for small-and-medium-sized zinc base alloy shaft sleeve

Examples

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Embodiment 1

[0019] The semi-molten state micro-die casting preparation method of a kind of small and medium-sized zinc-based alloy axle sleeve of embodiment 1, comprises the following steps:

[0020] 1) Preparation of semi-molten zinc-based alloy melt; ZA27 zinc-based alloy is selected, firstly, the zinc-based alloy is continuously heated until it is completely melted, and secondly, the fully melted zinc-based alloy is placed in a crucible and cooled to 450°C (ie Cool down to 50°C below the liquidus temperature of the zinc-based alloy), and finally, maintain a constant temperature and fully stir for 3 minutes to make the zinc-based alloy melt form a paste, that is, to obtain a semi-molten zinc-based alloy melt.

[0021] 2) Prepare the mold, which is a metal mold, including an upper punch with an air outlet plug and a lower die with a cavity corresponding to the shape of the zinc-based alloy bushing to be prepared, and then preheat the mold to 180°C , and finally inject the semi-molten zin...

Embodiment 2

[0024] The semi-molten state micro-die casting preparation method of a kind of small and medium-sized zinc-based alloy axle sleeve of embodiment 2 comprises the following steps:

[0025] 1) Preparation of semi-molten zinc-based alloy melt; ZA27 zinc-based alloy is selected. First, the zinc-based alloy is continuously heated until it is completely melted. Secondly, the fully melted zinc-based alloy is placed in a crucible and cooled to 455°C Cool down to 45°C below the liquidus temperature of the zinc-based alloy), and finally, maintain a constant temperature and fully stir for 4 minutes to make the zinc-based alloy melt form a paste, that is, to obtain a semi-molten zinc-based alloy melt.

[0026] 2) Prepare the mold, which is a metal mold, including an upper punch with an air outlet plug and a lower die with a cavity corresponding to the shape of the zinc-based alloy bushing to be prepared, and then preheat the mold to 190°C , and finally inject the semi-molten zinc-based all...

Embodiment 3

[0029] The semi-molten state micro-die casting preparation method of a kind of small and medium-sized zinc-based alloy axle sleeve of embodiment 3 comprises the following steps:

[0030] 1) Preparation of semi-molten zinc-based alloy melt; ZA27 zinc-based alloy is selected. First, the zinc-based alloy is continuously heated until it is completely melted. Secondly, the fully melted zinc-based alloy is placed in a crucible and cooled to 460°C Cool down to 40 °C below the liquidus temperature of the zinc-based alloy), and finally, maintain a constant temperature and stir for 5 minutes to make the zinc-based alloy melt form a paste, that is, a semi-molten zinc-based alloy melt is obtained.

[0031] 2) Prepare the mold, which is a metal mold, including an upper punch with an air outlet plug and a lower die with a cavity corresponding to the shape of the zinc-based alloy bushing to be prepared, and then preheat the mold to 200°C , and finally inject the semi-molten zinc-based alloy ...

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Abstract

The invention relates to the field of preparation technologies of small-and-medium-sized zinc base shaft products, in particular to a semi-molten micro-pressure die casting preparation method for a small-and-medium-sized zinc base alloy shaft sleeve. The semi-molten micro-pressure die casting preparation method comprises the steps that a semi-molten zinc base alloy melt is prepared and quantitatively injected into a die cavity of a lower female die of a die; an upper female die applies the micro-pressure to the semi-molten zinc base alloy melt in the lower female die through the die locking force; and cooling and die releasing are conducted. Through the semi-molten micro-pressure die casting preparation method, the problems of shrinkage cavity, shrinkage porosity and composition segregation occurring at the bottom of a casting when a small-sized zinc base alloy shaft sleeve is produced through a casting method are solved, and meanwhile, the mechanical properties and anti-attrition abrasion resistance of the small-sized zinc base alloy shaft sleeve are improved.

Description

technical field [0001] The invention relates to the field of preparation technology of small and medium-sized zinc-based shaft products, in particular to a method for preparing small and medium-sized zinc-based alloy shaft sleeves by semi-molten micro-die casting. Background technique [0002] ZA27 zinc-based alloy has successfully replaced copper alloy and Babbitt alloy for its good mechanical properties and anti-friction and wear-resisting properties, and is widely used in the production of various wear-resisting and wear-resisting products such as bushings, bearing bushes, sliders, and skateboards. At present, the vast majority of related production enterprises use conventional casting methods to manufacture zinc-based alloy bushings. However, due to the characteristics of zinc-based alloys with large differences in the proportion of main alloy components and a wide range of alloy solidification temperatures, zinc-based alloys manufactured by conventional casting methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00B22D21/00
CPCB22D17/007B22D21/00
Inventor 王爱琴张琦飞王震刘哲朱爱民杨斌谢敬佩杨森马窦琴王文焱
Owner HENAN UNIV OF SCI & TECH