Method for milling and repairing composite material by high-pressure abrasive particle water jet

A composite material and water jet technology, which is applied in the field of material processing, can solve the problems of unfavorable prepreg filling and curing repair, high heat, poor surface roughness, etc., to achieve close bonding, low roughness Ra, and repair The effect of the process

Pending Publication Date: 2020-08-14
HARBIN DONGAN ENGINE GRP
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Problems solved by technology

[0003] The common means of removing surface defects by mechanical methods include grinding wheel polishing, milling cutter milling, etc. The above methods can easily lead to different degrees of processing defects, such as delamination of substrate materials, poor surface roughness (high Ra value), and high heat generated by processing. and other defects; especially too high roughness is not conducive to subsequent prepreg filling and curing repair

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  • Method for milling and repairing composite material by high-pressure abrasive particle water jet

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Embodiment Construction

[0020] The implementation of high-pressure abrasive water jet repair composite material technology, the specific steps include:

[0021] (1) Clamping: Fix and clamp the part to ensure that the part fits with the positioning surface of the fixture. Select a position with good rigidity, easy support, and no interference with the water jet to press it through the pressure plate. Rubber pads need to be added at the pressed place to avoid Crushing the part substrate.

[0022] (2) Alignment: Alignment The surface jump of the plane to be processed is not greater than 0.10mm. This step can be carried out simultaneously with step (1).

[0023] (3) Tool setting: tool setting confirms the origin of the program and the starting point of the cutting tool;

[0024] (4) Parameter setting: According to the actual processing needs, set the feed F in the range of 2m / min to 6m / min, the pressure P in the range of 400bar to 1000bar, and the overlapping amount S in the range of 0.75mm to 1.5mm; T...

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Abstract

The invention belongs to the technical field of material processing, and particularly relates to a method for milling and repairing a composite material by high-pressure abrasive particle water jet. The technical route of the method comprises the steps of clamping; aligning; tool setting; parameter setting, wherein three key processing parameters of water flow pressure, feeding and overlap amountare set, the feeding F is in the range of 2 m / min-6 m / min, the pressure P is in the range of 400 bar-1000 bar, and the overlap amount S is in the range of 0.75 mm-1.5 mm; a tool feeding path is executed according to a turn-back path; and the abrasive particle flow rate is 0.45 kg / min, and the abrasive particle projection angle is 90 degree; milling, wherein after finishing the steps of aligning, fixing and setting parameters of a part, grinding processing is carried out according to the preset parameters; and dismounting, washing with water, drying by blowing and finally inspecting. Various disadvantages of traditional mechanical processing can be solved, lower roughness Ra can be obtained, the close combination of prepreg and a substrate is facilitated, and the best repairing effect is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of material processing, and in particular relates to a method for milling and repairing composite materials by high-pressure abrasive particle water jets. Background technique: [0002] CFRP carbon fiber reinforced composite materials have the characteristics of high specific stiffness, specific strength, and good fatigue resistance, and are widely used in the main structures of aircraft, such as aircraft spars, wing ribs, flaps, central wing boxes, etc.; usually the repair of composite materials The methods include resin injection method, mechanical repair method, and cut-and-fill glue joint repair method. Among them, the cut-and-fill glue joint repair method can reduce the weight gain of parts, uniform stress distribution, and have little impact on the aerodynamic shape. It is a high-precision repair method and requires strict aerodynamic shape. Parts must be repaired in this way; surface defects need to ...

Claims

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Application Information

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IPC IPC(8): B29C73/26
CPCB29C73/26B29C2073/262B24C1/045
Inventor 刘洋聂必成黄帅徐逊李洪宇
Owner HARBIN DONGAN ENGINE GRP
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