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A composite low-pressure casting riser and its preparation method

A low-pressure casting, riser technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the problems of poor mechanical properties, corrosion wear, easy to break, etc. of the riser, to prevent molten aluminum Iron infiltration problem, improve surface bonding force, improve the effect of comprehensive performance

Active Publication Date: 2017-12-15
NANTONG GAOXIN ANTIWEAR MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The riser is an important part of the pouring device in low-pressure casting. During the low-pressure casting process, the molten metal is transported into the cavity through the riser through the pressure. Therefore, the riser not only needs to transport high-temperature molten metal, but also works When the lower end is placed in the holding furnace of the low-pressure casting machine for sealing the molten aluminum (temperature 700°C to 900°C), the riser pipe will be damaged by wear and corrosion
At present, the commonly used risers are mainly made of integral cast iron, graphite and ceramics. Among them, the riser made of cast iron is prone to corrosion and wear under the working condition of low-pressure casting, and cast iron will produce The penetration of iron elements causes iron impurities to appear in the molten metal, which seriously affects the quality and comprehensive performance of cast parts; while the mechanical properties of the riser made of graphite are poor, and it is prone to breakage during use, resulting in damage and failure; In addition, the ceramic rising tube has the characteristics of high brittleness, so it is very easy to break during use, which affects production efficiency
Therefore, there is an urgent need to develop a composite low-pressure casting liquid riser with good mechanical properties, not easy to damage and high production efficiency and its preparation method. After searching, no technical solution identical or similar to the present invention has been found.

Method used

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  • A composite low-pressure casting riser and its preparation method
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  • A composite low-pressure casting riser and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0018] The invention also discloses a method for preparing a composite low-pressure casting riser, which is specifically as follows:

[0019] (1) Use casting technology to prepare a substrate with a wall thickness of 3-12 mm, and perform deburring and flashing treatment on the inner and outer surfaces of the substrate 1. After the treatment is completed, perform sandblasting and roughening on the surface of the substrate 1, wherein the particle size of the sand is 0.5 ~1.4mm, the surface roughness of substrate 1 is 2.5~13.0;

[0020] (2) Preheat the substrate 1 to 50-150°C. After the preheating is completed, use thermal spraying technology to spray the transition layer 3 on the inner and outer surfaces of the substrate 1, and control the spraying voltage of the spraying device to 65-80V and the current to 500-700A. The air pressure is 0.1-0.25MPa, and the spraying distance from the surface of the substrate 1 is 40-70mm;

[0021] (3) Continue to use the thermal spraying device...

Embodiment 2

[0026] The invention also discloses a method for preparing a composite low-pressure casting riser, which is specifically as follows:

[0027] (1) Use casting technology to prepare a substrate with a wall thickness of 3-12 mm, and perform deburring and flashing treatment on the inner and outer surfaces of the substrate 1. After the treatment is completed, perform sandblasting and roughening on the surface of the substrate 1, wherein the particle size of the sand is 0.5 ~1.4mm, the surface roughness of substrate 1 is 2.5~13.0;

[0028] (2) Preheat the substrate 1 to 150-250°C. After the preheating is completed, use thermal spraying technology to spray the transition layer 3 on the inner and outer surfaces of the substrate 1, and control the spraying voltage of the spraying device to 65-80V and the current to 500-700A. The air pressure is 0.25-0.4MPa, and the spraying distance from the surface of the substrate 1 is 70-120mm;

[0029] (3) Continue to use the thermal spraying devi...

Embodiment 3

[0034] The invention also discloses a method for preparing a composite low-pressure casting riser, which is specifically as follows:

[0035] (1) Use casting technology to prepare a substrate with a wall thickness of 3-12 mm, and perform deburring and flashing treatment on the inner and outer surfaces of the substrate 1. After the treatment is completed, perform sandblasting and roughening on the surface of the substrate 1, wherein the particle size of the sand is 0.5 ~1.4mm, the surface roughness of substrate 1 is 2.5~13.0;

[0036] (2) Preheat the substrate 1 to 250-350°C. After the preheating is completed, use thermal spraying technology to spray the transition layer 3 on the inner and outer surfaces of the substrate 1, and control the spraying voltage of the spraying device to 65-80V and the current to 500-700A. The air pressure is 0.4-0.5MPa, and the spraying distance from the surface of the substrate 1 is 120-160mm;

[0037] (3) Continue to use the thermal spraying devi...

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Abstract

The invention relates to a composite low-pressure casting riser tube and a preparation method thereof. The composite low-pressure casting riser tube comprises a base body, a transition layer and a ceramic coating coated in sequence from inside to outside. In preparation, firstly, a casting technology is used for preparing the base body of the riser tube, treatment such as deburring and deflashing is performed, and the sand blasting roughening treatment is performed on the base body of the riser tube; then, the transition layer and the ceramic coating are sprayed on the inner and outer surfaces of the base body by use of a thermal spraying technology; and finally, after-treatment such as polishing is performed on the prepared riser tube. The composite low-pressure casting riser tube and the preparation method thereof have the following advantages: the riser tube solves the problems of short life of an existing low-pressure casting riser tube and reduction of casting performance due to pollution of casting materials, has certain metal toughness and the wear and corrosion resistance of ceramic, solves the defects of high brittleness, easy cracking and easy breaking of a ceramic riser tube, and solves the problem of easy corrosion by molten metal and easy pollution to the molten metal of an integral cast iron riser tube through a barrier effect of the ceramic coating

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a composite low-pressure casting liquid riser and a preparation method thereof. Background technique [0002] Low-pressure casting is a method in which molten metal enters the cavity and solidifies under pressure to prepare parts. The riser is an important part of the pouring device in low-pressure casting. During the low-pressure casting process, the molten metal is transported into the cavity through the riser through the pressure. Therefore, the riser not only needs to transport high-temperature molten metal, but also works When the lower end is placed in the holding furnace of the low-pressure casting machine to seal the molten aluminum (temperature 700°C to 900°C), the riser pipe will be damaged by wear and corrosion. At present, the commonly used risers are mainly made of integral cast iron, graphite and ceramics. Among them, the riser made of cast iron is prone to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/04C23C4/12
CPCB22D18/04C23C4/12
Inventor 朱昱魏金栋倪红军孙书刚张宇汪兴兴吕帅帅黄明宇李小武
Owner NANTONG GAOXIN ANTIWEAR MATERIALS TECH CO LTD
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