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Large ceramic shell choking method for allowance-free precision casting

A large-scale ceramic and precision casting technology, applied in casting molding equipment, casting molds, casting mold components, etc., can solve problems such as high risk of high temperature creep deformation, out-of-tolerance casting surface size, shell expansion, etc. The effect of production qualification rate, accurate metal liquid flow direction, and reduction of master alloy dosage

Inactive Publication Date: 2021-03-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, during the pouring and solidification process, the metal liquid pressure on the super-large-sized casting ceramic shell is much higher than that of the small-sized casting shell. The surface size is seriously out of tolerance and scrapped

Method used

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  • Large ceramic shell choking method for allowance-free precision casting
  • Large ceramic shell choking method for allowance-free precision casting

Examples

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Embodiment 1

[0029] This embodiment is an example of installing a spoiler in the ceramic shell used for investment casting of super-large blades of a gas turbine turbine, and specifically includes the following steps:

[0030] Step S1: Design the casting system of the wax mold with baffles: it is necessary to add baffles between the vertical sprue and the load-bearing structure. Here, the cross-sectional dimensions of the wax mold are 30mm×20mm and 40mm×30mm, so design the baffles The size is 40mm×30mm and 50mm×40mm, and the thickness is about 10mm.

[0031] Step S2: Fabrication of the baffle: the baffle adopts the manufacturing method of the ceramic shell in the traditional investment precision casting, and the shell is made of a plate-shaped wax mold of 220mm×160mm×10mm. According to the thickness of the spoiler required, the number of shell layers is selected as 10 layers. The first layer is the surface layer, the 2nd, 3rd, and 4th layers are the transition layer, the 5th to 9th layers...

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Abstract

The invention discloses a large ceramic shell choking method for allowance-free precision casting, and belongs to the technical field of precision investment casting. The method comprises the following steps of designing a wax mould pouring system with spoilers, and adding the spoilers to the positions where the flow direction needs to be controlled and a bearing structure needs to be controlled;and the spoilers are made of a ceramic material. According to the combination of the wax mould pouring system with the spoilers, firstly, the prepared clean spoilers are connected with wax mould elements in the pouring system, and then the combination of the whole wax mould pouring system is carried out; and then shell making, dewaxing and sintering are carried out to obtain a final shell. The ceramic shell provided with the ceramic spoilers and designed by the invention is used for allowance-free precision casting and pouring of oversized blades, the flowing direction of molten metal is accurate, the usage amount of a mother alloy is remarkably reduced, and the production cost of precision castings is greatly reduced; and meanwhile, due to the fact that the usage amount of the mother alloy is greatly reduced, shell expansion of the ceramic shell is not generated any more, and the product percent of pass is also greatly increased. The method is reasonable in structural design, simple to operate and high in process stability.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a flow-blocking method for a large-scale ceramic shell for precision casting without margin, which is suitable for preparing ceramic shells for super-large-sized equiaxed crystal blades for gas turbines, and for other ceramic shells with no margin. The field of investment casting precision casting to prepare large ceramic shells. Background technique [0002] Precision casting superalloy turbine blades are the main core components of gas turbines. With the continuous improvement of the power of advanced gas turbines, the size and weight of gas turbine blades also continue to increase. For example, the radial height of the last-stage blades of a 300MW gas turbine has reached an order of 700mm or more, and the weight of the blade blank exceeds 20Kg. It is extremely difficult. [0003] Adjusting the flow direction of the molten metal during the pouring process...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/08B22C9/24
CPCB22C9/046B22C9/08B22C9/24
Inventor 王尧刘心刚董加胜楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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