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Machining method of thin-wall complex cavity

A processing method and cavity technology, which are applied in the field of workpiece processing to achieve the effects of easy quality control, meeting size and precision requirements, and smooth and compact joints.

Active Publication Date: 2021-02-09
XIAN YUANHANG VACUUM BRAZING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a processing method for a thin-walled complex cavity, which solves the problem that the thin-walled complex cavity workpiece cannot be processed by conventional methods such as precision casting and argon arc welding.

Method used

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  • Machining method of thin-wall complex cavity
  • Machining method of thin-wall complex cavity
  • Machining method of thin-wall complex cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a kind of like figure 2 The processing method of the thin-walled complex cavity shown, such as figure 1 shown, including the following steps:

[0038] S1. If figure 2 As shown, the workpiece is split into multiple layers according to the internal flow channel structure, so that each layer becomes an independent cavity;

[0039] S2. If image 3 As shown, each cavity is divided into a base plate and a cover plate, a runner groove is opened on the base plate, and a cover plate matching the runner groove is processed; Figure 4 As shown, the joint form of the runner groove and the cover plate is set as a lap joint. The bottom of the runner groove is opened as a square runner, and the top is opened as a square overlap groove with a size larger than the square runner. The size of the cover plate is the same as that of the square overlap. The grooves are matched; and chamfers are processed at the top corners of the cover;

[0040] The runner groove and the cover plate o...

Embodiment 2

[0060] On the basis of embodiment 1, the procedure of the vacuum brazing of each independent cavity is:

[0061] Vacuuming: cold vacuum degree 0.03Pa, working vacuum degree 0.05Pa;

[0062] Heating and heating: heating to 440°C at a rate of 150°C / h and holding for 30 minutes; heating to 900°C at a rate of 300°C / h and holding for 200 minutes; heating to 1050°C at a rate of 410°C / h;

[0063] Vacuum brazing: Brazing at 1050°C for 20 minutes;

[0064] Cooling and cooling: vacuum cooling to 600°C with the furnace, filling high-purity nitrogen into the furnace, turning on the fan to stir, and the pressure reaches 8×10 4 After Pa, start the fan and cool down to 70°C for release;

[0065] Under the action of capillary force, the solder can fully infiltrate, dissolve, diffuse and weld with the solid metal of the workpiece.

[0066] The conditions of each independent cavity are:

[0067] The condition of the pressure test is to test under 4MPa water pressure for 25 minutes to ensure...

Embodiment 3

[0070] The vacuum brazing procedure of the workpiece is:

[0071] Vacuuming: cold vacuum degree 0.04Pa, working vacuum degree 0.03Pa;

[0072] Heating and heating: heating at a rate of 150 °C / h to 400 °C and holding for 50 minutes; heating at a rate of 350 °C / h to 880 °C and holding for 100 min; heating at a rate of 490 °C / h to 1050 °C;

[0073] Vacuum brazing: Brazing at 1050°C for 30 minutes;

[0074] Cooling and cooling: vacuum cooling to 550°C with the furnace, filling the furnace with high-purity nitrogen, and the pressure reaches 9×10 4 After Pa, start the fan and cool to 60°C;

[0075] After the workpiece is brazed, the pressure test is carried out on the workpiece; the condition of the pressure test is to test under 4MPa water pressure for 20 minutes to ensure that the flow channel has no cavity, blockage, leakage and deformation;

[0076] The pressure test conditions for each independent cavity and workpiece are:

[0077] The condition of the pressure test is to t...

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Abstract

The invention relates to the technical field of workpiece machining, and discloses a machining method of a thin-wall complex cavity. The method comprises the following steps that S1, a workpiece is split into multiple layers according to an internal flow channel structure, and each layer becomes an independent cavity; S2, each cavity is split into a base plate and a cover plate, a runner groove isformed in each base plate, the cover plates matched with the runner grooves are machined, and chamfers are machined at the corners of the tops of the cover plates; S3, the cover plate and the base plate of each cavity are cleaned and polished and assembled, and brazing filler metal is injected into brazing seams along the chamfers of the cover plates; S4, each cavity is put into a vacuum furnacefor vacuum brazing; S5, the surface of each cavity is subjected to finish machining; S6, the cavities are cleaned and polished and assembled into a workpiece, and brazing filler metal is injected intoweld joints; S7, the workpiece is put into the vacuum furnace for vacuum brazing; and S8, finish machining is conducted on the workpiece after brazing. A thin-wall complex cavity workpiece is machined through the vacuum brazing method, simultaneous welding of a plurality of independent complex cavities and overall welding of the workpiece are achieved, and the requirements for the size and precision of the workpiece are met.

Description

technical field [0001] The invention relates to the technical field of workpiece processing, in particular to a processing method for a thin-walled complex cavity. Background technique [0002] Thin-walled complex cavity workpieces cannot be processed by general processing methods due to their fine and complex internal structures. Available processing methods include 3D printing, but the cost of 3D printing is relatively high, and the precision cannot be guaranteed within 0.05-0.1mm . [0003] The base of the scramjet engine is mainly composed of two independent cavities, the working air flow cavity and the cooling water cavity. The cooling water cavity is composed of 16 layers of water-cooling channels connected in parallel. The outer wall of the seat is distributed to cool the working airflow wall. The water-cooling flow channel is a 2mm*2mm rectangular flow channel with a wall thickness of 1mm. The contour of the mating surface on the outer surface of the base is require...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K1/008
CPCB23P15/00B23K1/008
Inventor 任军刘洋
Owner XIAN YUANHANG VACUUM BRAZING TECH
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