CN106342037B - A kind of method that adopts semi-solid preparation Z-pin to manufacture K-cor sandwich - Google Patents

Abstract

Adopt semi-solid preparation Z-pin to manufacture a method for K-cor sandwich, belong to composite material sandwich structure forming method. The crucial part of the method is: in the each lay preimpregnation of foam core material upper and lower surface tissue layer, by semi-solid preparation is that Z-pin inserts foam, certain length is respectively stretched out at two ends; The softening bending of Z-pin that heating, pressurization make to stretch out preimpregnation fabric is combined with preimpregnation fabric and is formed reinforced foam core, prepares panel, obtains K-cor sandwich after curing by common processes. Stretching out foam segment and panel resin co-curing by Z-pin increases the adhesion at interface, has improved the performance such as bending resistance, shearing resistance of K-cor sandwich.

Description

Translated fromChinese

一种采用半固化Z-pin制造K-cor夹层结构的方法A kind of method adopting semi-cured Z-pin to manufacture K-cor sandwich structure

一技术领域a technical field

本发明涉及到一种采用半固化Z-pin制造K-cor夹层结构的方法，属于复合材料夹层结构成型方法。The invention relates to a method for manufacturing a K-cor sandwich structure by using a semi-solidified Z-pin, which belongs to a composite material sandwich structure forming method.

二背景技术Two background technology

X-cor是一种增强的泡沫塑料芯材，即在泡沫塑料中植入与外表面呈一定角度的单向纤维针状物(即Z-pin)以形成网架结构。在有网架结构的泡沫塑料表面铺放预浸料经加压固化可得到X-cor夹层结构复合材料。由于网架结构的几何特性可以大幅度提高抗剪切性能和抗压性能，其抗压强度比一般蜂窝高出200％，而且可以降低吸水率、减轻重量。该结构可设计性强，根据需要可灵活地选用不同的Z-pin材料、几何角度、分布密度和泡沫芯的种类。美国已采用AZTEX公司开发的X-cor^TM材料替代部分蜂窝，制造夹层结构复合材料用于新型的飞机结构。X-cor is a reinforced foam core material, that is, unidirectional fiber needles (ie Z-pin) at a certain angle to the outer surface are implanted in the foam to form a grid structure. The X-cor sandwich structure composite material can be obtained by laying the prepreg on the surface of the foam plastic with grid structure and curing under pressure. Due to the geometric characteristics of the grid structure, the shear resistance and compression resistance can be greatly improved, and its compressive strength is 200% higher than that of ordinary honeycombs, and it can reduce water absorption and weight. The structure is highly designable, and different Z-pin materials, geometric angles, distribution densities and types of foam cores can be flexibly selected according to needs. The United States has used the X-cor^TM material developed by AZTEX to replace part of the honeycomb to manufacture sandwich structure composite materials for new aircraft structures.

X-cor结构中芯材泡沫与表面蒙皮之间的结合主要依靠Z-pin的端部与蒙皮的机械镶嵌来实现。由于这种镶嵌是点结合方式，结合力有限，在承受载荷时，X-cor结构首先在Z-pin端部与蒙皮的界面发生破坏，从而造成X-cor结构失效。The combination between the core material foam and the surface skin in the X-cor structure is mainly achieved by the mechanical inlay of the end of the Z-pin and the skin. Since this inlay is a point bonding method, the bonding force is limited. When the load is applied, the X-cor structure is first damaged at the interface between the end of the Z-pin and the skin, resulting in failure of the X-cor structure.

三发明内容Three invention content

本发明的目的是提供一种采用半固化Z-pin制造K-cor夹层结方法，来解决X-cor结构中Z-pin与表面蒙皮之间的结合较弱的问题，提高K-cor夹层结构的抗弯、抗剪等力学性能。The purpose of this invention is to provide a kind of adopt semi-solidified Z-pin to manufacture K-cor interlayer knot method, solve the weak problem of bonding between Z-pin and surface skin in the X-cor structure, improve K-cor interlayer Mechanical properties such as bending resistance and shear resistance of the structure.

一种采用半固化Z-pin制造K-cor夹层结构的方法，其特征在于：A kind of method that adopts semi-solidified Z-pin to manufacture K-cor sandwich structure is characterized in that:

(1)在泡沫芯材上下表面各铺放预浸纤维织物层；(1) Lay pre-impregnated fiber fabric layers on the upper and lower surfaces of the foam core material;

(2)将插孔器定位在预浸纤维织物上，用插孔针在泡沫芯材上插孔，孔径不大于Z-pin直径，孔贯穿泡沫及其表面上下层的预浸纤维织物；(2) Position the jack on the pre-impregnated fiber fabric, and use the jack needle to insert a hole on the foam core material. The hole diameter is not larger than the Z-pin diameter, and the hole runs through the foam and the pre-impregnated fiber fabric on the upper and lower layers of the surface;

(3)采用半固化的Z-pin插入泡沫，该半固化Z-pin采用溶液浸渍法制备或采用热熔法制备，采用所述的溶液浸渍法制备半固化Z-pin的工艺过程为：将纤维纱束通过树脂胶槽浸胶并垂直引伸，通过溶液表面张力和引伸力的共同作用共同保证Z-pin的圆度，连续烘干除去预浸纤维纱束中挥发性溶剂同时使树脂预固化，切割得到Z-pin，并将Z-pin一端磨尖；采用所述的热熔法制备半固化Z-pin的工艺过程是：将纤维纱束通过熔融的树脂浸胶并垂直引伸，连续烘干使树脂预固化，切割得到Z-pin，并将Z-pin一端磨尖；Z-pin的长度至少要使Z-pin伸出上下预浸纤维织物部分在Z-pin软化条件下能够弯曲贴覆在预浸纤维织物表面；Z-pin的固化程度要满足如下原则：①使Z-pin在室温下呈坚硬固体状；②Z-pin的玻璃化转变温度在满足上述第一原则的前提下，愈低愈好；(3) The semi-cured Z-pin is used to insert the foam, and the semi-cured Z-pin is prepared by a solution dipping method or a hot melt method. The process for preparing the semi-cured Z-pin by the solution dipping method is: The fiber bundles are impregnated in the resin glue tank and drawn vertically, the roundness of the Z-pin is ensured by the joint action of the surface tension of the solution and the drawing force, and the volatile solvent in the pre-impregnated fiber bundles is removed by continuous drying while the resin is pre-cured , cut to obtain Z-pin, and sharpen one end of Z-pin; the process of preparing semi-cured Z-pin by using the hot-melt method is: the fiber yarn is dipped in molten resin and stretched vertically, continuously baked Dry the resin to pre-cure, cut the Z-pin, and sharpen one end of the Z-pin; the length of the Z-pin should at least make the Z-pin protrude from the upper and lower parts of the prepreg fabric and be able to bend and stick it under the softening condition of the Z-pin Cover the surface of the pre-impregnated fiber fabric; the degree of curing of the Z-pin should meet the following principles: ① Make the Z-pin hard and solid at room temperature; ② The glass transition temperature of the Z-pin meets the first principle above. the lower the better;

(4)将Z-pin磨尖的一端沿泡沫及其上下表面层的预浸纤维织物的预插孔植入，使Z-pin伸出上下预浸纤维织物；(4) Implant the sharpened end of the Z-pin along the pre-insertion hole of the pre-impregnated fiber fabric of the foam and its upper and lower surface layers, so that the Z-pin extends out of the upper and lower pre-impregnated fiber fabrics;

(5)采用温度高于Z-pin玻璃化转变温度的热气流吹Z-pin伸出预浸纤维织物部分，使其软化，用热压辊碾压使Z-pin伸出部分贴覆在预浸纤维织物表面，热气流的温度选定原则为：能在5秒钟内使半固化Z-pin软化的最低温度；(5) Use a hot air flow with a temperature higher than the glass transition temperature of the Z-pin to blow the part of the Z-pin protruding from the pre-impregnated fiber fabric to soften it, and press it with a hot roller to make the protruding part of the Z-pin stick to the pre-impregnated fabric. Immerse the surface of the fiber fabric, and the temperature selection principle of the hot air flow is: the lowest temperature that can soften the semi-cured Z-pin within 5 seconds;

(6)在上下预浸纤维织物表面上铺放蒙皮预浸料，其中制造Z-pin用的树脂与蒙皮树脂均为QY8911树脂；(6) Lay the skin prepreg on the surface of the upper and lower prepreg fiber fabrics, wherein the resin used to make the Z-pin and the skin resin are both QY8911 resin;

(7)按蒙皮树脂的固化制度进行加压固化。(7) Pressurize and cure according to the curing system of the skin resin.

本发明的优点：通过在泡沫上预插孔、Z-pin一端磨尖以及将Z-pin半固化至呈坚硬固体状，方便了Z-pin植入泡沫；通过在泡沫上下两表面预铺预浸纤维织物，使Z-pin伸出泡沫部分容易贴覆在纤维织物表面，方便了蒙皮的铺放，Z-pin贴覆在预浸纤维织物表面部分与蒙皮树脂以及预浸纤维织物共固化，提高了Z-pin与蒙皮的结合力，从而提高夹层结构的抗弯、抗剪等力学性能。The advantages of the present invention: by pre-inserting holes on the foam, sharpening one end of the Z-pin and semi-curing the Z-pin to a hard solid state, it is convenient to implant the Z-pin into the foam; by pre-laying the upper and lower surfaces of the foam Impregnate the fiber fabric, so that the Z-pin protruding from the foam can be easily attached to the surface of the fiber fabric, which facilitates the laying of the skin. Curing improves the binding force between the Z-pin and the skin, thereby improving the mechanical properties of the sandwich structure such as bending resistance and shear resistance.

四附图说明Four drawings

图1是预插孔过程示意图。Fig. 1 is a schematic diagram of the pre-plugging process.

图2是预插孔泡沫(带有上下两层预浸纤维织物)主视图。Figure 2 is a front view of pre-plugged foam (with upper and lower layers of pre-impregnated fiber fabric).

图3是预插孔泡沫(带有上下两层预浸纤维织物)俯视图。Figure 3 is a top view of a pre-celled foam (with upper and lower layers of pre-impregnated fabric).

图4是半固化一端磨尖的Z-pin示意图。Figure 4 is a schematic diagram of a Z-pin with one end of the semi-cured sharpened.

图5是植入Z-pin的带有上下两层预浸纤维织物的泡沫示意图。Figure 5 is a schematic diagram of a foam with upper and lower layers of pre-impregnated fiber fabric implanted in Z-pin.

图6是使Z-pin伸出部分伏贴在预浸纤维织物表面工艺过程示意图。Fig. 6 is a schematic diagram of the process of making the protruding part of the Z-pin fit on the surface of the prepreg fabric.

图7是Z-pin伸出部分伏贴在预浸纤维织物表面主视示意图。Fig. 7 is a schematic front view of the protruding part of the Z-pin fitting on the surface of the prepreg fabric.

图8是Z-pin伸出部分伏贴在预浸纤维织物表面俯视示意图。Fig. 8 is a schematic top view of the protruding part of the Z-pin fitting on the surface of the prepreg fabric.

图9是K-cor成品结构示意图。Figure 9 is a schematic diagram of the finished K-cor structure.

图1中标号名称：1.插孔针，2.插孔器框架，3.插孔针导向管，4.预浸纤维织物，5.泡沫。Designation of labels in Fig. 1: 1. socket needle, 2. socket frame, 3. socket needle guide tube, 4. pre-impregnated fiber fabric, 5. foam.

图6中标号名称：6.热气流，7.热压辊。Label name among Fig. 6: 6. hot air flow, 7. hot pressing roller.

图9中标号名称：8.蒙皮，9.Z-pin，标号4和5与图1中一致。The label names in Figure 9: 8. Skin, 9. Z-pin, and the labels 4 and 5 are consistent with those in Figure 1.

五具体实施方式Five specific implementation methods

下面结合附图通过实例进一步说明本发明。Below in conjunction with accompanying drawing, further illustrate the present invention by example.

实施例1Example 1

如图1所示，将预浸有QY8911树脂的两块预浸碳纤维织物4铺放于一块20mm厚的PMI泡沫5上下两表面。将插孔器2置于上层的预浸碳纤维织物4上，插孔器导向管3与垂直面呈30度夹角。用插孔针1经由导向管3导向插孔，插孔针1直径1mm，由于泡沫5在插孔之后有回弹，实际泡沫孔径小于1mm，孔贯穿上下预浸碳纤维织物以及泡沫。插完孔的泡沫如图2、图3所示。As shown in Figure 1, two pre-impregnated carbon fiber fabrics 4 pre-impregnated with QY8911 resin are placed on the upper and lower surfaces of a 20mm thick PMI foam 5. The jack 2 is placed on the upper pre-preg carbon fiber fabric 4, and the jack guide tube 3 forms an angle of 30 degrees with the vertical plane. Use jack pin 1 to guide the jack through guide tube 3. Jack pin 1 has a diameter of 1 mm. Since foam 5 rebounds after the jack, the actual foam pore diameter is less than 1 mm, and the hole runs through the upper and lower pre-impregnated carbon fiber fabrics and foam. The foam after the hole is inserted is shown in Figure 2 and Figure 3.

将碳纤维纱通过QY8911的丙酮溶液浸渍并垂直引伸，通过引伸力和溶液表面张力的共同作用保证预浸纤维纱的圆度。将预浸纤维纱在50℃保温半小时，除去丙酮，在140℃下保温15分钟，使其预固化，剪成长度为33mm的Z-pin，将Z-pin一端磨尖，得到如图4所示的Z-pin。The carbon fiber yarn is impregnated with the acetone solution of QY8911 and drawn vertically, and the roundness of the prepreg fiber yarn is ensured by the joint action of the drawing force and the surface tension of the solution. Heat the pre-impregnated fiber yarn at 50°C for half an hour, remove acetone, heat it at 140°C for 15 minutes to precure, cut it into a Z-pin with a length of 33mm, and sharpen one end of the Z-pin, as shown in Figure 4 The Z-pin shown.

将Z-pin磨尖的一端沿预先插好的孔插入泡沫(包括上下两层预浸碳纤维织物)，Z-pin伸出上下预浸纤维织物长度相同，各约5mm，如图5所示。Insert the sharpened end of the Z-pin into the foam (including the upper and lower layers of pre-impregnated carbon fiber fabric) along the pre-inserted hole, and the Z-pin protrudes out of the upper and lower pre-impregnated fiber fabrics with the same length, each about 5mm, as shown in Figure 5.

如图6所示，采用140℃的热空气吹Z-pin伸出预浸纤维织物部分，使其软化，用热压辊7将Z-pin伸出部分压贴覆在预浸纤维织物上，在热压作用下，Z-pin与预浸纤维织物结合在一起，如图7、图8所示。As shown in Figure 6, use 140°C hot air to blow the Z-pin out of the prepreg fiber fabric to soften it, and use the hot pressing roller 7 to press the Z-pin out of the prepreg fabric. Under the action of hot pressing, the Z-pin is combined with the pre-impregnated fiber fabric, as shown in Figure 7 and Figure 8.

在上下预浸纤维织物表面铺放蒙皮8，该蒙皮采用碳纤维/QY8911预浸带铺放而成。按QY8911树脂的固化制度固化：120℃下保温1小时，加压0.4MPa；185℃下保温2小时，压力0.4MPa；195℃保温3小时。得到K-cor夹层结构如图9所示。A skin 8 is laid on the surface of the upper and lower prepreg fiber fabrics, and the skin is formed by laying carbon fiber/QY8911 prepreg tape. Curing according to the curing system of QY8911 resin: heat preservation at 120°C for 1 hour, pressurize 0.4MPa; heat preservation at 185°C for 2 hours, pressure 0.4MPa; heat preservation at 195°C for 3 hours. The resulting K-cor sandwich structure is shown in Figure 9.

实施例2Example 2

重复实施例1的方法，将Z-pin预固化制度改为在140℃下保温30分钟。Repeat the method of Example 1, and change the Z-pin pre-curing system to keep warm at 140°C for 30 minutes.

实施例3Example 3

重复实施例1的方法，将Z-pin预固化制度改为在140℃下保温50分钟。Repeat the method of Example 1, and change the Z-pin pre-curing system to keep warm at 140°C for 50 minutes.

Claims (1)

1. adopt semi-solid preparation Z-pin to manufacture a method for K-cor sandwich, it is characterized in that:

(1) in the each lay pre-soaking fiber of foam core material upper and lower surface tissue layer;

(2) jack device is positioned on pre-soaking fiber fabric, with jack pin jack on foam core material, aperture is not more than Z-pinDiameter, the pre-soaking fiber fabric of foam and surperficial levels thereof is run through in hole;

(3) adopt the Z-pin of semi-solid preparation to insert foam, this semi-solid preparation Z-pin adopts solution dipping method preparation or adopts hot meltLegal system is standby, and the technical process that adopts described solution dipping method to prepare semi-solid preparation Z-pin is: silvalin bundle is passed through to resin glue grooveImpregnation is also vertically extended, the circularity by solution surface tension with the acting in conjunction common guarantee Z-pin of the power of extending, continuous dryingRemove the intrafascicular volatile solvent of pre-soaking fiber yarn and make resin precuring simultaneously, cutting obtains Z-pin, and by Z-pin one end sharpening;The technical process that adopts described hot melt to prepare semi-solid preparation Z-pin is: silvalin bundle is also vertical by the resin impregnation of meltingExtend, continuous drying makes resin precuring, and cutting obtains Z-pin, and by Z-pin one end sharpening; The length of Z-pin is at least wantedMaking Z-pin stretch out upper and lower pre-soaking fiber fabric portions can paste at pre-soaking fiber fabric table under the softening condition of Z-pin in bendingFace; The state of cure of Z-pin will meet following principle: 1. make Z-pin at room temperature be hard solid shape; 2. the glass of Z-pinChange transition temperature meeting under the prerequisite of above-mentioned the first principle, better lower;

(4) one end of Z-pin sharpening is implanted along the pre-jack of the pre-soaking fiber fabric of foam and upper and lower surface layer thereof, make Z-pinStretch out upper and lower pre-soaking fiber fabric;

(5) adopt temperature to blow Z-pin higher than the thermal current of Z-pin glass transition temperature and stretch out pre-soaking fiber fabric portions,Make it softening, roll Z-pin extension is pasted at pre-soaking fiber fabric face with hot-pressing roller, the temperature of thermal current is selected formerBe: can within 5 seconds, make the softening minimum temperature of semi-solid preparation Z-pin;

(6) lay covering prepreg on upper and lower pre-soaking fiber fabric face, wherein manufactures resin and covering tree that Z-pin usesFat is QY8911 resin;

(7) carry out cure under pressure by the curing cycle of covering resin.