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A Method for Reducing Specific Gravity Segregation in Centrifugal Casting

A technology of centrifugal casting and specific gravity, which is applied in the field of casting, can solve problems such as limitation of action and specific gravity segregation, and achieve the effects of uniform composition and structure, improved mechanical properties, and accelerated metal flow rate

Active Publication Date: 2016-04-13
QINGDAO ZHENGDA FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above measures have a certain effect on solving the specific gravity segregation problem of centrifugal casting, but they all have limitations

Method used

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  • A Method for Reducing Specific Gravity Segregation in Centrifugal Casting

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Experimental program
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Effect test

Embodiment 1

[0023] Centrifugally cast a 9-ton ZCuAl9Fe4 copper alloy sleeve, including the following:

[0024] 1. Prepare various metals according to casting a 9-ton CuAl9Fe4 copper alloy sleeve and heat and melt them.

[0025] 2. Select a special bottom pouring ladle: the bottom inner diameter D1 of the special bottom pouring ladle, the inner diameter D2 at the predetermined height H, the predetermined height H and the diameter d of the injection hole meet the following requirements: D2=n×D1; d= m×D1; H=(1.2-1.5)×D1;

[0026] Among them: n is the diameter difference coefficient, the value is 1.2-1.3; when the density difference between the components in the alloy is greater than 5, take a large value, and when the density difference is below 3, take a small value; when the density difference is between 3-5, use interpolation The value of the coefficient is calculated by the method, and the unit of density is 10 3 kg / m3;

[0027] m is the injection hole coefficient, the value is 0.07-0...

Embodiment 2

[0037] Centrifugal casting of 6-ton ZCuPb30 copper alloy sleeve. Include the following:

[0038] 1. Prepare various metals according to casting a 6-ton ZCuPb30 copper alloy sleeve and heat and melt them.

[0039] 2. Select a special bottom pouring ladle: the bottom inner diameter D1 of the special bottom pouring ladle, the inner diameter D2 at the predetermined height H, the predetermined height H and the diameter d of the injection hole meet the following requirements: D2=n×D1; d= m×D1; H=(1.2-1.5)×D1;

[0040] Among them: n is the diameter difference coefficient, the value is 1.2-1.3; when the density difference between the components in the alloy is greater than 5, take a large value, and when the density difference is below 3, take a small value; when the density difference is between 3-5, use interpolation The value of the coefficient is calculated by the method, and the unit of density is 10 3 kg / m3;

[0041] m is the injection hole coefficient, the value is 0.07-0.0...

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Abstract

The invention discloses a method for reducing gravity segregation in centrifugal casting. According to the invention, ready-to-use metals are heated to be melted; the molten metal is poured into a selected dedicated bottom-pour ladle and is pre-stirred when the molten metal level reaches a preset height H to form molten metal vortex flows; then the plunger of the dedicated bottom-pour ladle is removed to form a negative pressure when the molten metal flows down in the dedicated bottom-pour ladle, so that vortex flows of the molten metal are formed in the central axis direction in the dedicated bottom-pour ladle under the action of siphon and gravity, which suck light metals in the upper layer and heavy metals in the lower layer at the same time and allow individual alloy elements to be re-distributed uniformly and flow down simultaneously to enter a casting mold in which the casting process is completed. The invention further provides a dedicated bottom-pour ladle. The method is simple and low in cost, and can improve the internal quality and mechanical property of cast products and ensure more compact structure of cast products.

Description

technical field [0001] The invention relates to a method for reducing specific gravity segregation in centrifugal casting, which belongs to the technical field of casting. Background technique [0002] The so-called casting segregation is the inhomogeneity of the chemical composition between the various parts of the casting section and the grains and grain boundaries after the alloy liquid solidifies in the mold. Since the chemical composition of each part of the casting is inconsistent, it is bound to make its mechanical and physical properties different, which will affect the working effect and service life of the casting. Therefore, in casting production, segregation of the alloy during solidification should be prevented as much as possible. [0003] Segregation is a casting defect, which is generally divided into three types, namely, intragranular segregation, regional segregation and specific gravity segregation. The so-called intragranular segregation, also known as ...

Claims

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Application Information

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IPC IPC(8): B22D13/12
Inventor 宋敬清宋忠刚
Owner QINGDAO ZHENGDA FOUNDRY