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Casting process and casting mould of large propeller hub body

A hub body and large-scale technology, which is applied in the direction of casting mold, mold composition, core, etc., can solve the problems that cannot meet the casting needs of large castings, the solidification time of large hub body castings is long, and the inhalation and oxidation of high-temperature melts are intensified. problems, to achieve the effect of reducing precipitation and reactive pore defects, reducing the phenomenon of suction slag entrainment, and improving the heat transfer coefficient

Inactive Publication Date: 2014-09-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional sand casting can meet the casting needs of small castings, but it cannot meet the casting needs of large castings due to defects in the process
[0003] Taking conventional sand casting as an example to pour an adjustable-pitch propeller hub with a diameter greater than 1.7 meters, there are the following problems: (1) During pouring, the melt (copper alloy liquid) flows vertically upward from the bottom of the casting mold at a certain flow rate. The turbulence generated by the vertical upward flow of molten metal into the cavity intensifies the gas-absorbing oxidation of the high-temperature melt, which in turn leads to casting defects such as pores in the casting; (2) The solidification time of the large hub body casting is long (up to 2-3 Days), the high-temperature melt is in contact with the sand mold (core) for a long time to cause intrusive pores and reactive pores
For large castings, the heat absorption capacity of the chilled iron is limited, and its continuous cooling ability is not good
Using low-pressure casting and other solutions can effectively reduce the turbulent flow phenomenon during pouring of the melt, but for large-scale hub body castings, the cost of supporting large-scale low-pressure casting machines is not only high, but also very difficult to implement

Method used

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  • Casting process and casting mould of large propeller hub body
  • Casting process and casting mould of large propeller hub body
  • Casting process and casting mould of large propeller hub body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 1 It is a structural schematic diagram of the large-scale propeller hub body mold in embodiment 1; figure 2 It is a schematic diagram of the flow of the melt in the large propeller hub body casting mold of embodiment 1; image 3 It is the comparison between the hub body obtained in Example 1 and the hub body obtained by using the existing casting method, a is the hub body obtained by the existing casting method; b is the hub body obtained in Example 1;

[0036] This embodiment discloses a large propeller hub body casting mold, which is used for casting the propeller hub body of a large marine adjustable pitch propeller with a diameter of 1.7 meters and a weight of about 8 tons. The casting mold of the large propeller hub body adopts the side bottom casting pouring system as a whole, and the specific structure is as follows: figure 1As shown, it includes the cavity 3, the inner runner 2 and the runner 1, the runner 1 is an annular channel arranged under the cav...

Embodiment 2

[0041] Figure 4 It is an axial sectional view of the casting core of Example 2.

[0042] This embodiment is basically the same as Embodiment 1, the difference is that the casting core 5 of the large propeller hub body mold in this embodiment is provided with a cooling water channel 6, such as Figure 4 As shown, the cooling channel 6 is fixed on the bottom of the sand box through a rigid base. In order to enhance the cooling water 7 effect, the water inlet 8 of the cooling channel 6 is arranged at the bottom of the mold, and the water outlet 9 is arranged at the top of the mold. The cooling channel 6 is made of red copper. When the casting mold is used to cast a large propeller hub body casting, the heat of the sand core can be taken away in time by the cooling water 7 in the cooling water channel 6 to realize the effect of cooling from the inside. The mutual cooperation of internal and external heat exchange accelerates the solidification rate of large hub body castings a...

Embodiment 3

[0045] This embodiment is basically the same as Embodiment 1, except that the included angle between the axis of the sprue of the large hub body casting mold and the tangent line of the runner in this embodiment is 30°.

[0046] In this embodiment, the angle between the axis of the inner runner and the tangent of the runner is 30°, which can effectively reduce the degree of turbulence during filling of the casting and accelerate the solidification rate of the large casting. There are few precipitated and reactive porosity defects.

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Abstract

The invention provides a casting process and a casting mould of a large propeller hub body. The casting process comprises the following steps: a melt enters a cavity from the bottom of the casting mould, and an included angle between the flow direction of the melt entering the cavity and the bottom surface of the cavity is 20-80 degrees; the whole cavity is filled with the melt, cooling is performed, and then the casting mould is dismantled to obtain the propeller hub body. The casting process is simple and feasible, the turbulent flow degree of castings during filling can be effectively reduced, the solidification rate of large castings is increased, and the large propeller hub body cast by adopting the process has few precipitating and reacting pore defects. The casting mould is scientific and reasonable in structure and can be used for casting the large propeller hub body with few precipitating and reacting pore defects.

Description

technical field [0001] The invention relates to casting technology, in particular to a pouring process and casting mold for a large propeller hub body. Background technique [0002] At present, the pouring of the hub body adopts conventional sand casting. When using conventional sand casting castings, the melt enters the cavity from the inrunner at the bottom of the casting mold (the inrunner is perpendicular to the runner, and the inrunner is perpendicular to the bottom of the casting mold) until the entire cavity is filled. The melt is cooled, and the casting mold is removed to obtain the hub body. Conventional sand casting can meet the casting needs of small castings, but it cannot meet the casting needs of large castings due to the defects in the process. [0003] Taking conventional sand casting as an example to cast an adjustable-pitch propeller hub with a diameter greater than 1.7 meters, there are the following problems: (1) During pouring, the melt (copper alloy l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/08B22C9/10
Inventor 王同敏李廷举曹志强接金川卢一平康慧君
Owner DALIAN UNIV OF TECH
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