阅读说明：本技术 一种方管加强型聚氨酯纸芯复合备胎盖板的生产方法 (Production method of square tube reinforced polyurethane paper core composite spare tire cover plate ) 是由 程时先 戴勇 津野滋 王险峰 郑冠崔 黄碧桃 于 2021-01-14 设计创作，主要内容包括：本发明提出了一种方管加强型聚氨酯纸芯复合备胎盖板的生产方法,在不破坏蜂窝纸芯支撑的前提下把2根方管模压复合进去,保证备胎盖板的强度和质量稳定性。本发明采用的技术方案为：首先在蜂窝纸芯成型出容纳方钢管的定位槽,然后将下层玻璃纤维毡、蜂窝纸芯、上层玻璃纤维毡依次对齐平铺并喷涂聚氨酯发泡胶,再模压成型,成型工艺简单,成型性能好；在压制过程中,方钢管的一部分被直接被压入蜂窝纸芯的定位槽中,成型过程中不破坏此位置的蜂窝纸芯支撑,成型得到的产品强度和质量稳定性好,合格率高。(The invention provides a production method of a square tube reinforced polyurethane paper core composite spare tire cover plate, which is characterized in that 2 square tubes are molded and compounded on the premise of not damaging a honeycomb paper core support, so that the strength and the quality stability of the spare tire cover plate are ensured. The technical scheme adopted by the invention is as follows: firstly, forming a positioning groove for accommodating a square steel tube by a honeycomb paper core, then sequentially aligning, tiling and spraying polyurethane foaming adhesive on a lower layer of glass fiber felt, the honeycomb paper core and an upper layer of glass fiber felt, and then performing compression molding, wherein the molding process is simple and the molding performance is good; in the pressing process, one part of the square steel pipe is directly pressed into the positioning groove of the honeycomb paper core, the honeycomb paper core support at the position is not damaged in the forming process, and the formed product is good in strength and quality stability and high in qualification rate.)

1. A production method of a square tube reinforced polyurethane paper core composite spare tire cover plate is characterized by comprising the following steps:

(1) preparing materials: preparing 2 glass fiber felts, 1 honeycomb paper core, 2 square steel pipes and polyurethane glue according to the size of a product;

(2) rolling the positioning groove: rolling a positioning groove for accommodating a square steel pipe on the honeycomb paper core;

(3) spreading materials: aligning and flatly paving a lower layer of glass fiber felt, a honeycomb paper core and an upper layer of glass fiber felt in sequence;

(4) uniformly spraying polyurethane foaming glue on the upper surface and the lower surface of the material paved in the step (3);

(5) and (3) pressing and forming: putting the material sprayed in the step (4) into a mold, putting 2 square steel tubes into the mold on the spread material, directly positioning the square steel tubes by positioning grooves of the honeycomb paper core, starting a press machine, closing the mold, and performing press molding to obtain a square tube reinforced polyurethane paper core composite spare tire cover plate; (6) and (3) cooling at normal temperature: and (3) placing the square tube reinforced polyurethane paper core composite spare tire cover plate obtained by press forming on a cooling clamp for cooling and shaping at normal temperature, wherein the cooling time at normal temperature is not less than 60 s.

2. The production method of the square tube reinforced polyurethane paper core composite spare tire cover plate according to claim 1, characterized in that: and (4) putting the material paved in the step (3) in a material spraying clamping hand, and then uniformly spraying polyurethane foaming glue on the upper surface and the lower surface.

3. The production method of the square tube reinforced polyurethane paper core composite spare tire cover plate according to claim 1 or 2, characterized in that: in the step (5), the temperature of the die is 110-120 ℃ during compression molding, the molding pressure is 9-10 MPa, and the molding time is 280-350 s.

Technical Field

The invention belongs to the field of manufacturing of automobile spare tire cover plates, in particular relates to manufacturing of a polyurethane paper core composite spare tire cover plate, and particularly relates to a production method of a square tube reinforced polyurethane paper core composite spare tire cover plate.

Background

The automobile spare tire cover plate is mainly installed on an automobile trunk and plays roles in decoration and bearing, nowadays, people put forward higher and higher requirements on the aspects of safety, comfort, environmental protection and the like of an automobile, and in order to achieve light weight, the application of a polyurethane composite material in the automobile is more and more wide.

At present, a lightweight polyurethane paper core composite spare tire cover plate is formed by laminating, pouring and mould pressing a plurality of layers, wherein a wrapping surface layer is a hard polyurethane foaming layer, a second layer is a glass fiber felt, and an intermediate layer is a honeycomb paper core; the fourth layer is a glass fiber felt.

With the development of automobiles, the design of multifunctional spare tire cover plates is a popular trend, and a metal framework reinforced polyurethane paper core composite spare tire cover plate is developed at present, wherein polyurethane glue is uniformly sprayed on a glass fiber felt, and the sprayed glass fiber felt is flatly laid on the upper surface and the lower surface of a honeycomb paper core; placing the honeycomb paper core and the glass fiber felt into a mold, then placing the mold into 2 square steel tubes, and performing pressing and foaming molding on a molding machine; in the pressing process, one part of the square steel tube is directly and forcibly pressed into the honeycomb paper core, the honeycomb paper core support at the position is damaged, the integral strength of the product is influenced, and the strength and the quality of the spare tire cover plate are unstable.

Disclosure of Invention

In order to ensure the strength and the quality of the spare tire cover plate, the invention provides a production method of a square tube reinforced polyurethane paper core composite spare tire cover plate, which is characterized in that 2 square tubes are molded and compounded on the premise of not damaging the support of a honeycomb paper core, so that the strength and the quality stability of the spare tire cover plate are ensured.

In order to achieve the purpose, the invention adopts the technical scheme that: a production method of a square tube reinforced polyurethane paper core composite spare tire cover plate is characterized by comprising the following steps:

(1) preparing materials: preparing 2 glass fiber felts, 1 honeycomb paper core, 2 square steel pipes and polyurethane glue according to the size of a product;

(2) rolling the positioning groove: rolling a positioning groove for accommodating a square steel pipe on the honeycomb paper core;

(3) spreading materials: aligning and flatly paving a lower layer of glass fiber felt, a honeycomb paper core and an upper layer of glass fiber felt in sequence;

(4) spraying: uniformly spraying polyurethane foaming glue on the upper surface and the lower surface of the material paved in the step (3);

(5) and (3) pressing and forming: putting the material sprayed in the step (4) into a mold, putting 2 square steel tubes into the mold on the spread material, directly positioning the square steel tubes by positioning grooves of the honeycomb paper core, starting a press machine, closing the mold, and performing press molding to obtain a square tube reinforced polyurethane paper core composite spare tire cover plate; (6) and (3) cooling at normal temperature: and (3) placing the square tube reinforced polyurethane paper core composite spare tire cover plate obtained by press forming on a cooling clamp for cooling and shaping at normal temperature, wherein the cooling time at normal temperature is not less than 60 s.

Further, in the step (4), the material laid in the step (3) is placed in a material spraying clamp, and then polyurethane foaming glue is uniformly sprayed on the upper surface and the lower surface; and (3) clamping the paved material in the step (3) by a material spraying clamping hand, further ensuring that the paved material is not staggered, being more convenient for spraying on two sides and improving the efficiency.

Further, in the step (5), the temperature of a die is 110-120 ℃ during press forming, the forming pressure is 9-10 MPa, and the forming time is 280-350 s; the parameter setting tends to be reasonable and easy to implement.

The invention has the beneficial effects that: the invention firstly forms the positioning groove for accommodating the square steel tube on the honeycomb paper core, then sprays polyurethane foaming glue, and then carries out compression molding, the forming process is simple, and the forming performance is good; in the pressing process, one part of the square steel pipe is directly pressed into the positioning groove of the honeycomb paper core, the honeycomb paper core support at the position is not damaged in the forming process, and the formed product is good in strength and quality stability and high in qualification rate.

Drawings

Fig. 1 is a front view (cross-sectional view) of a square tube reinforced polyurethane paper core composite spare tire cover plate according to the present invention.

Fig. 2 is a top view of the square tube reinforced polyurethane paper core composite spare tire cover plate of the present invention.

Fig. 3 is a cross-sectional view taken along a-a in fig. 2.

Fig. 4 is a structural view of a honeycomb paper core of the present invention.

Detailed Description

As shown in fig. 1-3, the structure of the square tube reinforced polyurethane paper core composite spare tire cover plate according to the present invention is formed by laminating and molding a plurality of layers, wherein the wrapping surface layer is a rigid polyurethane foam layer 2, the second layer is a glass fiber felt 3, and the middle layer is a honeycomb paper core 1; the fourth layer is a glass fiber felt 3; one side of the steel tube is embedded with 2 square steel tubes 4 for strengthening.

The material in the material is a common performance rigid polyurethane foaming layer 2 with the density of 300-800kg/m³(ii) a Glass fiber mat 3, gram weight 100-²(ii) a The honeycomb paper core 3 is 15-30mm thick.

The invention is described in further detail in connection with the accompanying figures 1-4: a production method of a square tube reinforced polyurethane paper core composite spare tire cover plate comprises the following steps:

(1) preparing materials: preparing 2 glass fiber felts, 1 honeycomb paper core, 2 square steel pipes and polyurethane glue according to the size of a product;

(2) rolling the positioning groove: rolling a positioning groove 1-1 (shown in figure 4) for accommodating a square steel pipe on the honeycomb paper core 1;

(3) spreading materials: aligning and flatly paving a lower layer of glass fiber felt, a honeycomb paper core and an upper layer of glass fiber felt in sequence;

(4) spraying: putting the material laid in the step (3) in a material spraying clamping hand, and then uniformly spraying polyurethane foaming glue on the upper surface and the lower surface;

(5) and (3) pressing and forming: putting the material sprayed in the step (4) into a die integrally, then positioning and putting 2 square steel pipes in the die on the paved material, and then pressing and forming to obtain the square tube reinforced polyurethane paper core composite spare tire cover plate as shown in figures 1-3); the temperature of a die is 110-120 ℃ during molding and pressing, the molding pressure is 9-10 MPa, and the molding time is 280-350 s;

(6) and (3) cooling at normal temperature: and (3) placing the square tube reinforced polyurethane paper core composite spare tire cover plate obtained by press forming on a cooling clamp for cooling and shaping at normal temperature, wherein the cooling time at normal temperature is not less than 60 s.

In the step (5), the parameters of the press forming are reasonably limited, and may be implemented by other options.

The features further defined in the present invention or further additional features may be combined as desired or simply replaced within the scope of the understanding and implementation of the present invention by the skilled person.

The innovation of the invention is that: the honeycomb paper core compression molding device overcomes the conventional compression molding thought in the prior art, and the positioning grooves are formed in the honeycomb paper core firstly, and then the square steel pipes are implanted in the compression molding process, so that the phenomenon that the honeycomb paper core support fails in the compression molding process is avoided, and the strength and the quality of the product are ensured.