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Mother for preparing a lifting tube through counter-gravity casting

A technology of anti-gravity casting and manufacturing methods, which is applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipe fittings, etc., can solve the problems of iron pipe corrosion, complicated process, and polluted alloy liquid, etc., and achieve high air tightness and The effect of strength, huge economic benefits, and simple process

Inactive Publication Date: 2013-02-13
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described in ZL200520073212.9 and ZL200820059059.8, the iron layer tube and the ceramic layer tube in the composite riser are bonded by water glass or other physical methods. The method of painting the paint is good, but there is also the problem that the iron layer and the ceramic layer are not tightly bonded. The metal liquid can easily infiltrate from the joint between the iron layer and the ceramic layer, causing corrosion of the iron pipe and polluting the alloy liquid.
At the same time, the ceramic layer tube also needs to be formed by powder metallurgy, the process is complicated and the cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) A stainless steel pipe is used as the base pipe, and a 45° break is opened at the top, and a flange with the same diameter as the base pipe is welded to the top of the steel pipe by brazing;

[0022] (2) Carry out sandblasting treatment on the welded riser pipe blank to remove surface oil stains, roughen the surface of the riser pipe blank with a grinder, pickle and dry;

[0023] (3) Hot-dip aluminizing is carried out after the riser tube blank is dried. The temperature in the aluminizing tank is 650°C, and the hot-dip aluminizing time is controlled at 10 minutes. After hot-dip aluminizing, a 0.15mm The pure aluminum layer, a 0.1mm transition layer containing Fe atoms and Al atoms is formed between the pure aluminum layer and the substrate layer;

[0024] (4) Perform micro-arc oxidation on hot-dip aluminum-coated riser tube blanks, and use NaOH:NaAlO as the electrolyte 2 :Na 2 SiO 3 =1:5:1.5, the solution temperature is controlled at 20~40°C, and the current dens...

Embodiment 2

[0027] (1) A cast iron pipe is used as the base pipe, and a 45° gap is opened at the top, and a flange with the same diameter as the base pipe is welded to the top of the steel pipe by tungsten argon arc welding;

[0028] (2) Carry out sandblasting treatment on the welded riser pipe blank to remove surface oil stains, roughen the surface of the riser pipe blank with a grinder, pickle and dry;

[0029] (3) After the riser tube billet is dried, hot-dip aluminizing is carried out. The temperature in the aluminizing tank is 800°C, and the hot-dip aluminizing time is controlled at 2 minutes. After hot-dip aluminizing, a 0.3mm The pure aluminum layer, a 0.1mm transition layer containing Fe atoms and Al atoms is formed between the pure aluminum layer and the substrate layer;

[0030] (4) Perform micro-arc oxidation on hot-dip aluminum-coated riser tube blanks, and use NaOH:NaAlO as the spot solution 2 :Na 2 SiO 3 =1:5:1.5, the solution temperature is controlled at 20~40°C, and the...

Embodiment 3

[0032] (1) A stainless steel pipe is used as the base pipe, and a 45° break is opened at the top, and a flange with the same diameter as the base pipe is welded to the top of the steel pipe by brazing;

[0033] (2) Carry out sandblasting treatment on the welded riser pipe blank to remove surface oil stains, roughen the surface of the riser pipe blank with a grinder, pickle and dry;

[0034] (3) Hot-dip aluminizing is carried out after the riser tube billet is dried. The temperature in the aluminizing tank is 730°C, and the hot-dip aluminizing time is controlled at 7 minutes. After hot-dip aluminizing, 0.25mm The pure aluminum layer, a 0.1mm transition layer containing Fe atoms and Al atoms is formed between the pure aluminum layer and the substrate layer;

[0035] (4) Perform micro-arc oxidation on hot-dip aluminum-coated riser tube blanks, and use NaOH:NaAlO as the spot solution 2 :Na 2 SiO 3 =1:5:1.5, the solution temperature is controlled at 20~40°C, and the current dens...

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Abstract

The invention discloses a method for preparing a lifting tube through counter-gravity casting, which uses a stainless steel tube or a cast iron pipe as a matrix tube, wherein a layer of aluminum oxide (Al2O3) ceramic layer which endures erosion and is not wetted in alloy liquid such as aluminum (Al) liquid and the like, the Al2O3 ceramic layer and a ferrum (Fe) matrix layer have strong binding power, and the Al2O3 ceramic layer is also not easy to fall even in a collision situation. Because of adopting the Fe matrix tube, the formed lifting tube by adopting the method for preparing the lifting tube through counter-gravity casting is high in air tightness and strength. The formed lifting tube adopting the method for preparing the lifting tube through counter-gravity casting is high in reliability, simple in process and low in cost, and can generate huge economic benefits.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a method for manufacturing a liquid riser, in particular to a method for manufacturing a liquid riser for anti-gravity casting. Background technique [0002] Anti-gravity casting technology means that the molten metal in the melting crucible fills the mold from bottom to top along the riser pipe in the direction opposite to gravity under a certain gas pressure, and the molten metal in the mold is solidified under a certain pressure. , to release the pressure on the liquid surface of the crucible, return the unsolidified molten metal in the riser to the crucible and keep the riser unblocked, and open the mold at this time to obtain a casting. Anti-gravity casting methods include low pressure casting, differential pressure casting, pressure regulating casting, etc. The liquid riser is an important part of the anti-gravity casting equipment, and it is the necessary channel for the li...

Claims

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Application Information

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IPC IPC(8): C25D11/04C23C2/12F16L9/02B22D18/04B22D18/00B22D17/20
Inventor 周中波薛祥义张利军王金龙狄玮岚
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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