阅读说明：本技术 一种用于单向预浸料铺贴的成型模具及其使用方法 (Forming die for paving and pasting unidirectional prepreg and using method thereof ) 是由 张佳卫 郭红军 侯伟 张达 涂尚平 于 2020-12-01 设计创作，主要内容包括：本发明为一种用于单向预浸料铺贴的成型模具,包括芯模和辅助模,所述芯模由若干柔性带堆叠而成,所述辅助模的一端设有导向部,所述导向部用于引导所述芯模沿着所述导向部的形状产生形变。本发明克服了复合材料成型过程中模具成本较高的缺点,由于本方案中芯模采用弹性材料成型,可以通过改变辅助模轮廓的方法来得到需要的制件外形,并且本方案中芯模可以重复使用；同时本方案涉及的芯模适用于多种类型的预制体成型,适用性强的特点。(The invention relates to a forming die for paving and pasting a unidirectional prepreg, which comprises a core die and an auxiliary die, wherein the core die is formed by stacking a plurality of flexible belts, one end of the auxiliary die is provided with a guide part, and the guide part is used for guiding the core die to deform along the shape of the guide part. The invention overcomes the defect of higher cost of the die in the forming process of the composite material, and because the core die is formed by adopting the elastic material, the required appearance of the workpiece can be obtained by changing the outline of the auxiliary die, and the core die can be repeatedly used; the mandrel that this scheme relates to is applicable to the shaping of polytype's preform simultaneously, characteristics that the suitability is strong.)

1. The utility model provides a forming die that is used for one-way prepreg to spread subsides which characterized in that: including mandrel (1) and supplementary mould (2), mandrel (1) is piled up by a plurality of flexible bands (4) and forms, the one end of supplementary mould (2) is equipped with guide part (5), guide part (5) are used for the guide mandrel (1) is along the shape of guide part (5) produces the deformation.

2. A forming die for unidirectional prepreg layup as claimed in claim 1, wherein: the flexible belt (4) is strip-shaped.

3. A forming die for unidirectional prepreg layup as claimed in claim 1, wherein: the flexible belt (4) is made of elastic non-metal materials.

4. A forming die for unidirectional prepreg layup as claimed in claim 3, wherein: the elastic non-metal material is polytetrafluoroethylene, polyethylene or silicon rubber.

5. A forming die for unidirectional prepreg layup as claimed in claim 1, wherein: the flexible belt (4) is made of elastic metal.

6. A forming die for unidirectional prepreg layup according to claim 5, wherein: the elastic metal is steel or aluminum.

7. A forming die for unidirectional prepreg layup as claimed in claim 1, wherein: an outer mold for curing the unidirectional prepreg (3) is also included.

8. The method of using the molding die according to any one of claims 1 to 7, wherein: comprises that

S1, laying the unidirectional prepreg (3) on the core mould (1), pressing the unidirectional prepreg (3) on the core mould (1) by a vacuum pressurization method, and laying the unidirectional prepreg (3) along the length direction of the core mould (1) to form a prefabricated body;

s2, heating the core mould (1), and extruding the core mould (1) to deform the core mould (1) and the prefabricated body along the guide part (5) of the auxiliary mould (2);

and S3, taking down the laid prefabricated body from the core mold, and putting the prefabricated body into an outer mold for curing.

Technical Field

The invention belongs to the technical field of molds, and particularly relates to a forming mold for unidirectional prepreg paving and pasting.

Background

The carbon fiber composite material as a high-performance material has a plurality of excellent performances such as low density, high specific strength, high specific modulus, anisotropy, fatigue resistance, corrosion resistance, strong designability, easy integral forming and the like, thereby being more and more widely applied. The unidirectional prepreg is a main form of an existing airplane composite material structure, and the carbon fiber unidirectional prepreg has stronger orthogonal anisotropy (the difference between the performance in the fiber direction and the performance in the vertical fiber direction is 1-2 orders of magnitude) compared with a fabric prepreg, so that the characteristic provides more design possibilities for the design of the airplane.

However, in the molding process of the composite material part, the molding die cost is high, and different types of parts need a set of molding die, so that the application of the composite material in the industrial field is seriously influenced; meanwhile, in the process of manufacturing, compared with the carbon fiber fabric prepreg, the unidirectional prepreg is easy to have the problems of fiber wrinkle, splitting and the like in the paving and pasting process.

Disclosure of Invention

The invention provides a forming die for paving and pasting unidirectional prepreg, aiming at solving the problems that the cost of the forming die is high and different types of parts need one set of forming die in the forming process of composite material parts.

Preferably, the flexible strip is strip-shaped.

Furthermore, the flexible belt is made of elastic non-metallic materials.

Preferably, the elastic nonmetal is polytetrafluoroethylene, polyethylene or silicone rubber.

Furthermore, the flexible belt is made of elastic metal.

Preferably, the resilient metal is steel or aluminum.

Further, an outer mold for curing the unidirectional prepreg is also included.

The invention also provides a method for using the forming die, which comprises the following steps:

s1, paving unidirectional prepreg on the core mould, pressing the unidirectional prepreg on the core mould by a vacuum pressurization method, and paving the unidirectional prepreg along the length direction of the core mould to form a prefabricated body;

s2, heating the core mold, and extruding the core mold to deform the core mold and the preform along the guide portion of the auxiliary mold;

and S3, taking down the laid prefabricated body from the core mold, and putting the prefabricated body into an outer mold for curing. Has the advantages that: the invention overcomes the defect of higher cost of the die in the forming process of the composite material, and because the core die is formed by adopting the elastic material, the required appearance of the workpiece can be obtained by changing the outline of the auxiliary die, and the core die can be repeatedly used; the mandrel that this scheme relates to is applicable to the shaping of polytype's preform simultaneously, characteristics that the suitability is strong.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the deformation of the core mold according to the present invention;

FIG. 3 is a schematic view of a unidirectional prepreg layup of the present invention;

FIG. 4 is a schematic view of the core mold deformation after the unidirectional prepreg is laid and attached;

FIG. 5 is a schematic view of the completion of the molding of the unidirectional prepreg of the present invention;

FIG. 6 is a flow chart of the preform molding process of the present invention;

in the figure: 1. a core mold; 2. an auxiliary die; 3. unidirectional prepreg; 4. a flexible band; 5. a guide portion.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it is to be understood that the terms "upper", "top", "bottom", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

Example 1

A forming die for paving and pasting unidirectional prepreg comprises a core die 1 and an auxiliary die 2, wherein the core die 1 is formed by stacking a plurality of flexible belts 4, one end of the auxiliary die 2 is provided with a guide part 5, and the guide part 5 is used for guiding the core die 1 to deform along the shape of the guide part 5; an outer mold for curing the unidirectional prepreg 3 is also included.

The flexible belt 4 is strip-shaped.

The flexible belt 4 is made of an elastic material, and may be made of an elastic nonmetal or an elastic metal, and in this embodiment, polytetrafluoroethylene is taken as an example for explanation.

The working principle is as follows: as shown in figure 6 of the drawings,

s1, laying unidirectional prepreg 3 on the core mould 1, pressing the unidirectional prepreg 3 on the core mould 1 by a vacuum pressurization method, and laying the unidirectional prepreg 3 along the length direction of the core mould 1 to form a preform;

s2, heating the core mold 1, and pressing the core mold 1 to deform the core mold 1 and the preform along the guide 5 of the auxiliary mold 2;

and S3, taking down the laid prefabricated body from the core mold, and putting the prefabricated body into an outer mold for curing. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.