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Surface layer mold shell for inhibiting burr defects of precision casting, preparation method and mold shell with surface layer mold shell

A precision casting and surface layer technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., to achieve the effects of ensuring suspension, solving surface pitting, and good coating performance

Pending Publication Date: 2021-04-06
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a surface layer mold that suppresses the burr defect of precision castings, a preparation method and a mold shell with it, and solves the interface between the mold shell and the molten metal prepared by using zircon powder. question of response

Method used

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Examples

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Effect test

preparation example Construction

[0022] The present invention provides a kind of preparation method of the surface layer mold that suppresses precision casting burr defect, adopt the surface layer mold prepared by this preparation method and the mold shell that comprises this surface layer mold, specifically comprise the following steps:

[0023] 1) Carry out wax mold pressing, trimming and combination according to the general production process of high manganese steel or high alloy steel precision casting;

[0024] 2) Prepare the surface layer slurry: pour the silica sol with a particle size of 8um as the surface layer binder into the batching machine, and add an appropriate amount of wetting agent according to the ratio of 1kg: 1.5ml for the surface layer binder and wetting agent, and stir until uniform; then use 325-mesh fused corundum powder, pour the fused corundum powder into the batching machine in batches with a powder-to-liquid ratio of 1:3.0 to 1:3.4, stir until it is completely fused, and then press...

Embodiment 1

[0029] Embodiment 1: The main vortex device of a certain machine

[0030] 1) Make a high alloy precision casting according to the shape and size of the main vortex precision casting drawing, the wall thickness is 2.0mm, and the material is K605.

[0031] 2) Carry out wax mold pressing, trimming and combination according to the production process of the main vortex precision casting.

[0032] 3) When preparing the surface layer slurry, pour the required surface layer with 8μm silica sol into the batching machine, add 15ml of wetting agent, and stir until uniform; then add 325 mesh fused corundum powder, according to the powder-to-liquid ratio of 1:3.0 Add in batches, stir until all are fused, and then add 15ml of defoamer in proportion. Finally, reduce the speed and stir for 10 min until the foam finally subsides.

[0033] 4) Adjust the slurry according to the detected technical parameters of the surface layer slurry. If the fluidity of the prepared surface layer slurry is to...

Embodiment 2

[0037] Example 2: A mouthpiece for a scientific research model

[0038] 1) Make high-temperature alloy precision castings according to the shape and size of the nozzle precision castings, with an average wall thickness of 2.5mm, and the material is K536.

[0039] 2) Carry out wax mold pressing, trimming and combination according to the production process of the precision casting of the nozzle.

[0040] 3) When preparing the surface layer slurry, pour the required surface layer with 8μm silica sol into the batching machine, add 20ml of wetting agent, and stir until uniform; then add 325 mesh fused corundum powder, according to the powder-to-liquid ratio of 1:3.3 Add in batches, stir until all are fused, and then add 20ml of defoamer in proportion. Finally, reduce the speed and stir for 15 minutes until the foam finally subsides.

[0041]4) Adjust the slurry according to the detected technical parameters of the surface layer slurry. If the fluidity of the prepared surface laye...

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Abstract

The invention provides a surface layer mold shell for inhibiting burr defects of a precision casting, a preparation method and a mold shell with the surface layer mold shell. The preparation method comprises the following steps that S1, a surface layer binder and a wetting agent are mixed to obtain a solvent A, then fused corundum powder is added, a defoaming agent is added for stirring after the fused corundum powder is fused, and surface layer slurry is obtained; and S2, detection is carried out on the density and viscosity of the surface layer slurry, if the parameters of the surface layer slurry are qualified, emery is scattered on the surface layer slurry, then drying is carried out, and the surface layer mold shell is obtained. The surface layer mold shell is prepared by the steps and then the surface layer mold shell is used for combining to form the mold shell; and according to the preparation method, the neutral refractory material corundum powder is used for replacing the original zircon powder to prepare the surface layer coating, so that the interface reaction between the surface layer refractory material and the mother alloy is inhibited in mechanism, the percent of pass and the surface roughness of high manganese steel and high alloy steel casting are effectively improved, and meanwhile the production cost of the precision casting is reduced.

Description

technical field [0001] The invention belongs to the technical field of investment precision casting, in particular to a surface shell for suppressing burr defects of precision castings, a preparation method and a shell with the same. Background technique [0002] When using the investment casting method to prepare precision castings, the shell-making process generally uses surface layer silica sol + zircon powder, and the reinforcement layer is prepared by kaolin powder + ethyl silicate hydrolyzate / silica sol; zircon powder is used as the production The surface layer refractory material for the shell, the SiO 2 It will easily react with C, Cr, Al, Hf and other active elements in superalloys to form a chemical sand sticking phenomenon; cause defects such as pitting and burrs on the casting surface; and there is a certain thickness of the interface reaction, for no margin For precision casting thin-walled parts, it is necessary to eliminate the surface defects of the casting,...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C3/00B22C9/22
CPCB22C9/04B22C3/00B22C9/22
Inventor 潘锐武晓刚孙文扬董茵张妮卢兵兵王玮商辉
Owner AECC AVIATION POWER CO LTD
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