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Method for removing powder particles in titanium alloy sandwich layer narrow-channel component

A powder particle, narrow flow channel technology, applied in additive manufacturing, additive processing, etc., can solve the problems of difficult to completely remove powder particles, deformation of thin-walled sandwich parts, accumulation of grinding particles, etc., to achieve process stability and reproduction Good performance, no processing stress, simple operation effect

Pending Publication Date: 2021-06-01
XIAN SPACE ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for complex structures such as thin-walled interlayers and narrow flow channels (for example, the body of the thrust chamber is a sandwich structure, and the cooling channel in the interlayer forms a spiral narrow flow channel through the inner wall / outer wall / flow guide rib), it is difficult to completely remove the abrasive particle flow remaining in the The powder particles in the dead corners of the interlayer, and the grinding particles are easy to accumulate in the dead corners, which cannot be completely eliminated, and there is a risk of introducing redundant substances
At the same time, if the pressure of the abrasive flow is too small, it is difficult for the grinding particles to smoothly pass through the narrow flow channel in the complex interlayer, but if the pressure is too high, it may cause local deformation of the thin-walled interlayer parts
[0004] At the same time, after reviewing a large amount of data and consulting with many companies, and using simulation parts to carry out verification tests, it is found that it is difficult to completely remove the powder particles in the inner cavity of the interlayer narrow flow channel by existing conventional mechanical methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using chemical degreasing method, pour degreasing agent into the interlayer narrow flow channel of additively manufactured TC4 material 3D shell components, wash at 60°C for 30min, the NaOH content in the degreasing agent is 50g / L, Na 2 CO 3 10H 2 O content is 80g / L, Na 3 PO 4 12H 2 O content is 40g / L, Na 2 SiO 3 The content is 5g / L. After degreasing, use 0.1MPa tap water to rinse the inner cavity of the parts.

[0034] After degreasing and cleaning the components, carry out chemical treatment, the content of HF in the chemical treatment is 40g / L, HNO 3 The content is 300g / L, the content of sodium dodecylbenzenesulfonate is 0.2g / L, chemically treat the powder particles in the inner cavity for 2min under the pressure of 0.1MPa, and rinse the inner cavity of the parts with 0.1MPa tap water after chemical treatment.

[0035] Endoscopic inspection was carried out on the interlayer inner cavity of the part after degreasing and powder removal. The inner wall of the fl...

Embodiment 2

[0037] Using chemical degreasing method, degreasing agent is poured into the narrow flow channel of the interlayer of 3D shell components made of additive manufacturing TC4 material, and cleaned at 60°C for 30 minutes. The NaOH content in the degreasing agent is 70g / L, Na 2 CO 3 10H 2O content is 100g / L, Na 3 PO 4 12H 2 O content is 50g / L, Na 2 SiO 3 The content is 8g / L. After degreasing, use 0.3MPa tap water to rinse the inner cavity of the parts.

[0038] After degreasing and cleaning the components, when performing chemical treatment, the HF content is 40g / L, HNO 3 The content is 350g / L, and the content of sodium dodecylbenzenesulfonate is 0.2g / L. Under the pressure of 0.1MPa, the inner cavity powder particles are chemically treated for 2 minutes, and the inner cavity of the parts is washed with tap water after chemical treatment.

[0039] Endoscopic inspection was carried out on the interlayer inner cavity of the part after degreasing and powder removal. The inner ...

Embodiment 3

[0041] Using chemical degreasing method, degreasing agent is poured into the narrow flow channel of the interlayer of 3D shell components made of additive manufacturing TC4 material, and cleaned at 60°C for 30 minutes. The NaOH content in the degreasing agent is 60g / L, Na 2 CO 3 10H 2 O content is 90g / L, Na 3 PO 4 12H 2 O content is 50g / L, Na 2 SiO 3 The content is 6g / L. After degreasing, use 0.2MPa tap water to rinse the inner cavity of the parts.

[0042] After degreasing and cleaning the components, when performing chemical treatment, the HF content is 40g / L, HNO 3 The content is 350g / L, the content of sodium dodecylbenzenesulfonate is 0.2g / L, chemically treat the powder particles in the inner cavity for 4min under the pressure of 0.1MPa, and rinse the inner cavity of the parts with tap water after chemical treatment.

[0043] Endoscopic inspection was carried out on the interlayer inner cavity of the part after degreasing and powder removal. The inner wall of the f...

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PUM

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Abstract

The invention provides a method for removing powder particles in a titanium alloy sandwich layer narrow-channel component. The method comprises the following steps that 1, a sandwich layer narrow channel of the component is filled with a deoiling agent, oil dirt in the sandwich layer narrow channel of the component is removed, and the deoiling agent is discharged after treatment is finished; 2, the remaining deoiling agent is removed through water washing; 3, a chemical treating agent is continuously introduced into the sandwich layer narrow channel of the component at the room temperature and the pressure of 0.1-0.3 MPa for 2-4 minutes, and the powder particles in the sandwich layer narrow channel are dissolved and stripped off; and 4, acid liquor and corrosion products are removed by water washing. By means of the method, the powder particles stuck to the surface of an inner cavity of the sandwich layer flow channel can be thoroughly removed, and the risk that the powder particles fall off to form redundant products is eliminated. Besides, the surface roughness can be obviously reduced; and the product processing property is improved. No deformation is generated after machining, and the defects, such as machining stress, are not generated; the operation is simple, and the cost is low; and no new redundant products are introduced.

Description

technical field [0001] The invention belongs to the field of post-processing of additive manufacturing, and in particular relates to a method for removing powder particles of a titanium alloy interlayer narrow flow channel component. The method can completely remove the powder particles adhered to the surface of the inner cavity, and eliminate the risk of powder particles falling off and forming redundant objects. , while significantly reducing surface roughness and improving product performance. Background technique [0002] In order to meet the small batch, light weight and fast-paced requirements of liquid rocket engines, additive manufacturing technology is playing an increasingly important role in the development of aerospace liquid power models. However, the problems of "spheroidization effect" and "powder adhesion" unique to metal additive manufacturing technology lead to excessively high surface roughness, which significantly affects the performance of hydraulic powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10B22F10/62B33Y40/20
CPCC23G1/106B22F3/24B33Y40/20B22F2003/241
Inventor 叶晖许维超薛露平白静卢勋超梁成明许伟
Owner XIAN SPACE ENGINE CO LTD