The important composition of aluminum honeycomb panel

aluminum honeycomb panel是由两块极薄的铝板夹着一层蜂窝芯组成，由于蜂窝芯实体部分的面积很小所以Honeycomb Panel的整体质量很轻，另外，它还具有高比强度和比刚度以及隔热、隔声等诸多优点，因而在航空航天、列车及船舶等领域获得了极其广泛的应用。本文主要对aluminum honeycomb panel的制备技术研究现状进行了综合评述。

1Preparation of Honeycomb Core

The shape of the metal honeycomb core is a regular hexagon, diamond, rectangle, equilateral triangle, sine curve and other shapes, because the regular hexagonal honeycomb material saving, simple manufacturing and high structural efficiency and the most widely used. At present, the preparation method of the regular hexagonal honeycomb core mainly includes the stretching method and the forming method.

The stretching method is to first apply glue strips on the materials, then glue the materials together, and finally stretch the laminated and glued materials into honeycomb, then cut it into the required size and put it into use. The honeycomb core prepared by this method will be affected by many factors such as glue width, glue adhesion, basic mechanical and physical properties of the core material, thus causing defects of local insufficient stretching or excessive stretching in the stretching process, in turn, the shape of the honeycomb core is not regular enough, which ultimately affects the stability of product quality, so this method is mainly used in the construction field that does not require high size and strength.

The honeycomb core prepared by forming method is usually to roll or roll the metal honeycomb foil into corrugated corrugated corrugated board, and then use a certain tooling fixture to connect these corrugated boards, commonly used connection methods are cementing and brazing, the honeycomb core prepared by this method, the cell size is accurate, and can be prepared for any specification of honeycomb core. However, if the bonding agent is used to connect each honeycomb core, the connection strength between the core layers will be directly affected by the strength of the bonding agent, so the bonding connection has been slowly replaced by the brazing method. Because brazing can form a strong metallurgical bond between the core layer, the joint strength is high, and the processing efficiency is high, so it is very suitable for the forming and processing of the metal honeycomb core, so it has been widely used in recent years.

2Connection of Honeycomb Core and Panel

蜂窝芯和面板的连接方法也有胶结和焊接2species. The gluing method is to heat and pressurize the panel and core with hot curing glue in a continuous forming machine and then compound them. With this method of connection, the honeycomb panels are not subjected to external heating cycles, but surface pretreatment is required before connection. In addition, the strength, service life and allowable working environment of the adhesive honeycomb panel are largely affected by the performance of the adhesive. For example, due to the high-altitude irradiation and low temperature, the organic adhesive in the honeycomb sandwich structure used in the aerospace field is prone to molecular chain scission and cold brittleness, which in turn reduces the straight tensile strength of the honeycomb panel by about50%. Therefore, this method is less used today in the increasingly high demand for cellular performance.

焊接法又分为钎焊、缝焊、激光焊接和瞬间液相连接。由于缝焊的过程比较复杂，而且由于缝焊过程中焊轮在每一焊点上停留时间短，所以焊件表面的散热条件差，很容易发生过热，从而影响所制备Honeycomb Panel的整体力学性能;While transient liquid phase diffusion bonding is mostly used in multi-alloy systems;The investment cost of laser welding equipment is large, so the brazing method is currently the most widely used. The assembly and clamping method before brazing of honeycomb plates is to assemble the honeycomb core one by one with an assembly fixture, then clamp the honeycomb core with the upper and lower panels, and finally clamp the whole metal honeycomb plate with a flat thin steel plate using a five-point clamping method.

In general, whether it is the connection of the honeycomb core or the connection of the honeycomb core and the panel, the welding method is used to connect it, which can form a strong metallurgical bond between the joints, and its overall mechanical properties are much better than the honeycomb sandwich plate prepared by cementing. Therefore, in order to obtain high-performance metal honeycomb sandwich plate, brazing method has broad prospects for development.

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