CN-115655065-B - Method for checking fit clearance inside large-area cementing

Abstract

The application relates to a method for checking a large-area gluing fit clearance, and belongs to the technical field of composite material gluing. A method for inspecting the fit gap in large-area adhesive joint includes such steps as surface treating the surface of skin, laying the adhesive dots on the surface of skin, putting the reinforcing ribs on the surface of skin, applying the pressure to the surface of skin, separating the reinforcing ribs from the surface of skin, and inspecting the fit gap. The checking method of the fit clearance reduces checking cost and working procedures, and can check the molded surface of the whole fit clearance of the cementing surface between the skin and the reinforcing rib.

Inventors

• LUO JUN
• YANG YU
• GU JIGUANG
• MAO ZHU

Assignees

• 成都飞机工业（集团）有限责任公司

Dates

Publication Date

20260512

Application Date

20220930

Claims (5)

1. 1. A method for inspecting a fit-in gap in a large-area glue joint, the method being for inspecting a fit-in gap between a skin and a stiffener, comprising the steps of: The skin is subjected to surface treatment, and detection glue points are paved on the surface of the skin after the surface treatment, wherein the paving density of the detection glue points is 100-400 pcs/m 2 , and the detection glue points are made of a double-horse J-299 glue film; placing the reinforcing ribs on the skin according to the fit relation of the fit gaps, and applying detection pressure from the direction of the reinforcing ribs towards the skin, wherein the detection pressure is 10-20 kPa; Separating the reinforcing rib from the skin, and forming a test area by taking the position of the untransferred detection glue point as the circle center and taking R as the radius when detecting that the untransferred detection glue point exists on the surface of the skin; the detection glue points are removed, and test glue points are paved on the surface of the test area, wherein the test glue points are fully paved on the surface of the test area, no interference exists between the adjacent test glue points, and the size of the test glue points is 0.5-2 cm 2 ; Placing the reinforcing ribs on the skin according to the fit relation of the fit clearance, and applying test pressure from the reinforcing ribs towards the skin, wherein the test pressure is the same as the detection pressure; separating the reinforcing ribs from the skin again, and determining an area in which the untransferred test glue points in the test area are distributed, namely a compensation area; And carrying out compensation repair on the compensation area, returning to the step of placing the reinforcing ribs on the skin according to the fit relation of the fit clearance, and applying detection pressure from the reinforcing ribs towards the skin until all the detection glue points are transferred from the surface of the skin to the surface of the reinforcing ribs.
2. 2. A method of inspecting a large area bonded internal fit gap according to claim 1, wherein the step of compensating for the compensation zone comprises: Cutting to obtain a compensation adhesive film which is the same as the compensation area according to the shape of the compensation area; Paving the compensation adhesive film on the surface of the skin corresponding to the compensation area; And (5) heat-treating and compacting the compensation adhesive film.
3. 3. A method of inspecting a large area bonded internal fit gap according to claim 1, wherein the step of surface treating comprises: roughening the surface of the skin; and paving a layer of base adhesive film on the surface of the skin after the surface roughening treatment, and compacting the base adhesive film.
4. 4. A method of inspecting a large area internal mating gap for bonding according to claim 3, wherein the compaction process is performed under full vacuum conditions at 60 ℃.
5. 5. The method of claim 4, wherein the thickness of the base film after compacting is the same as the thickness of the test glue sites.

Description

Method for checking fit clearance inside large-area cementing Technical Field The application relates to the technical field of composite material bonding, in particular to a method for checking a large-area bonding internal fit clearance. Background The co-glued reinforced wallboard refers to that the skin involved in gluing is cured first, the reinforcing ribs involved in gluing are not cured after being paved, the paved reinforcing ribs and the skin are bonded into an integral wallboard through an adhesive film, and the positions and the external dimensions of the reinforcing ribs are ensured through a reinforcing rib forming die. Generally, the fit clearance before the reinforced wallboard is glued is verified by adopting a thermal verification method, the same operation parameters as the curing are adopted during verification, the fit clearance between the skin and the reinforcing ribs is detected through a verification film, and whether the fit clearance meets the requirement is judged through the thickness value change caused by the pressed state of the verification film. The hot checking method is high in autoclave entering cost, long in part manufacturing period and complex in working procedure. Besides checking film detection, the adhesive joint gap can be detected by using the thousandth pad, but the thousandth pad detection has certain defects, and only the edge part of the joint surface of the reinforcing rib and the skin can be detected, so that the internal gap condition of the joint surface can not be detected. In view of this, in order to solve the deficiencies of the prior art, a method for inspecting a large-area adhesive-bonded internal fit gap is provided. Disclosure of Invention The application provides a method for checking fit clearance inside large-area gluing, which aims to solve the technical problems that the integral molded surface of the joint surface of a skin and a reinforcing rib is difficult to detect, the fit clearance checking cost is high and the working procedure is complex in the prior art when large-area co-gluing is performed. In order to achieve the above purpose, the application adopts the following technical scheme: a method of inspecting a fit-in-large-area bonded joint, the method for inspecting a fit-in-gap between a skin and a stiffener, comprising the steps of: Surface-treating the skin, and paving detection glue points on the surface of the skin after surface treatment; Placing the reinforcing ribs on the skin according to the fit relation of the fit gaps, and applying detection pressure from the reinforcing ribs towards the skin; And separating the reinforcing ribs from the skin, and checking whether all the detection glue points are transferred from the surface of the skin to the surface of the reinforcing ribs so as to check the fit clearance. Optionally, the step of checking whether the glue sites are all transferred from the surface of the skin to the surface of the stiffener comprises: When the fact that the surface of the skin has untransferred detection glue points is detected, determining a compensation area which does not meet the matching relation according to the position of the untransferred detection glue points; performing compensation repair on the compensation area; And returning to the step of placing the reinforcing ribs on the skin according to the fit relation of the fit clearance, and applying detection pressure from the reinforcing ribs towards the skin until all the detection glue points are transferred from the surface of the skin to the surface of the reinforcing ribs. Optionally, the step of determining the compensation area that does not satisfy the matching relationship according to the position of the non-transferred detection glue dot includes: forming a test area by taking the position of the untransferred detection glue point as a circle center and taking R as a radius; removing the detection glue points, and paving test glue points on the surface of the detection area; Placing the reinforcing ribs on the skin according to the fit relation of the fit clearance, and applying test pressure from the reinforcing ribs towards the skin, wherein the test pressure is the same as the detection pressure; and separating the reinforcing ribs from the skin, and determining an area distributed by the untransferred repairing glue points in the test area, namely a compensation area. Optionally, the test glue sites are fully laid on the surface of the test area, and no interference exists between adjacent test glue sites. Optionally, the step of compensating and repairing the compensation area includes: Cutting to obtain a compensation adhesive film which is the same as the compensation area according to the shape of the compensation area; Paving the compensation adhesive film on the surface of the skin corresponding to the compensation area; And (5) heat-treating and compacting the compensation adhesive film. Optionally, the laying density o