阅读说明：本技术 一种j字型复合材料加强筋的制造方法 (Manufacturing method of J-shaped composite material reinforcing rib ) 是由 王一奇 王强 侯晓峰 卜聪 高航 于 2021-04-08 设计创作，主要内容包括：本发明公开了一种J字型复合材料加强筋的制造方法,包括以下步骤：制备平面预制体；成型反C字型件预制体；成型反Z字型件预制体；拼合J字型复合材料加强筋；固化J字型复合材料加强筋。本发明通过一次铺放2-3层预浸料、多次铺放的方法制备碳纤维复合材料预制体,解决了逐层铺放成型效率低的问题。本发明将反Z字型件预制体分成两步成型,其中反Z字型件半成品配套模具的钝角设计使得在热隔膜成型中隔膜能够将预制体压实到模具表面而不产生架桥,克服了热隔膜成型在类深腔的结构中无法成型的问题。本发明通过真空袋法制备碳纤维复合材料平面预制体解决了预浸料层间有气泡问题,通过热隔膜成型方式解决了R角区域褶皱的产生的问题。(The invention discloses a manufacturing method of a J-shaped composite material reinforcing rib, which comprises the following steps: preparing a plane prefabricated body; forming a prefabricated body of the reverse C-shaped part; forming a reverse Z-shaped part prefabricated body; splicing J-shaped composite material reinforcing ribs; and curing the J-shaped composite material reinforcing rib. The carbon fiber composite material preform is prepared by a method of laying 2-3 layers of prepreg once and laying for multiple times, so that the problem of low forming efficiency of laying layer by layer is solved. The invention divides the prefabricated body of the reverse Z-shaped part into two steps for forming, wherein the obtuse angle design of the semi-finished product of the reverse Z-shaped part matched with the mould ensures that the diaphragm can compact the prefabricated body to the surface of the mould without bridging in the thermal diaphragm forming process, thereby overcoming the problem that the thermal diaphragm cannot be formed in the structure of the similar deep cavity. The invention solves the problem of air bubbles between prepreg layers by preparing the carbon fiber composite material planar preform through a vacuum bag method, and solves the problem of generation of wrinkles in an R-angle area through a thermal diaphragm forming mode.)

1. A manufacturing method of a J-shaped composite material reinforcing rib comprises a reverse C-shaped piece (1), a reverse Z-shaped piece (2) and a straight piece (3), the upper transverse edge and the straight edge of the reverse C-shaped part (1) are in transition with each other through a round angle R, and the straight edge and the lower transverse edge are in transition with each other through a round angle R, the upper transverse edge and the straight edge of the reverse Z-shaped component (2) are in transition with each other through a round angle R, and the straight edge and the lower transverse edge are in transition with each other through a round angle R, the straight edge of the reverse C-shaped part (1) is connected with the straight edge of the reverse Z-shaped part (2), the lower transverse edge of the reverse C-shaped part (1) is connected with the lower transverse edge of the reverse Z-shaped part (2), the left side and the right side of the straight-shaped part (3) are respectively connected with the upper transverse edge of the reversed C-shaped part (1) and the upper transverse edge of the reversed Z-shaped part (2), a triangular area between the upper transverse edge of the straight-shaped part (3) and the upper transverse edge of the reversed C-shaped part (1) and the upper transverse edge of the reversed Z-shaped part (2) is a core material (4);

the method is characterized in that: the manufacturing method comprises the following steps:

A. preparation of planar preforms

The method comprises the following steps of preparing a carbon fiber composite material plane prefabricated body by adopting a vacuum bag method, wherein the carbon fiber composite material plane prefabricated body comprises a straight-line-shaped piece plane prefabricated body, an inverse C-shaped piece plane prefabricated body and an inverse Z-shaped piece plane prefabricated body, and the sizes of the straight-line-shaped piece plane prefabricated body, the inverse C-shaped piece plane prefabricated body and the inverse Z-shaped piece plane prefabricated body meet the design requirements, and the method comprises the following specific steps:

a1, paving an isolation cloth on the flat plate;

a2, laying 2-3 layers of carbon fiber composite prepreg on a piece of isolation cloth;

a3, covering an isolation cloth and an air felt on the upper layer of the carbon fiber composite prepreg;

a4, placing a vacuum bag on the air-permeable felt and sealing the periphery of the flat plate by using a sealing adhesive tape;

a5, keeping the vacuum bag for a time t after vacuum pumping, and removing air between prepreg layers of the carbon fiber composite material;

a6, taking down the isolation cloth, the air-permeable felt and the vacuum bag; if the thickness requirement of the carbon fiber composite material plane prefabricated body is met, turning to the step B; otherwise, continuously laying 2-3 layers of carbon fiber composite prepreg on the original carbon fiber composite prepreg; turning to step A3;

B. prefabricated body for forming I-shaped part

Placing the straight-shaped piece plane prefabricated body on a straight-shaped piece mold (8), and integrally transferring the straight-shaped piece plane prefabricated body to a thermal diaphragm platform for heating, vacuumizing and forming for t;

C. prefabricated body for forming reverse C-shaped part

Placing the reverse C-shaped piece plane prefabricated body on a reverse C-shaped piece mold (5) according to the design size requirement; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the reverse C-shaped part die (5) is rectangular, and two corners in contact with the reverse C-shaped part prefabricated body are rounded corners R;

D. prefabricated body for forming reverse Z-shaped part

D1, placing the reverse Z-shaped part plane prefabricated body on a reverse Z-shaped part semi-finished product matching mould (6) according to the design size requirement; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the semi-finished product matched mould (6) of the inverted Z-shaped part is polygonal, the left side edge consists of an upper vertical edge, a bevel edge and a lower vertical edge, the angle between the upper vertical edge and the bevel edge is 120-160 degrees, the upper edge and the lower edge are both horizontal edges, and the right side edge is a vertical edge; the joint of the upper vertical edge and the upper edge is in rounded corner R transition;

d2, turning the semi-finished product (21) of the reverse Z-shaped piece, and transferring the semi-finished product to a mold (7) of the reverse Z-shaped piece; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the reverse Z-shaped part die (7) is polygonal, the left side edge consists of an upper vertical edge, a middle horizontal edge and a lower vertical edge, a round corner R is used for transition between the upper vertical edge and the middle horizontal edge, the upper edge and the lower edge are both horizontal edges, and the right side edge is a vertical edge; the joint of the upper vertical edge and the upper edge is in rounded corner R transition;

E. spliced J-shaped composite material reinforcing rib

Splicing straight edges of the reversed C-shaped part (1) and the reversed Z-shaped part (2) together through a reversed C-shaped part mould (5) and a reversed Z-shaped part mould (7), filling a core material (4) in a triangular area spliced and connected with the reversed C-shaped part (1) and the reversed Z-shaped part (2), splicing a straight-shaped part (3) on the upper transverse edges of the reversed C-shaped part (1) and the reversed Z-shaped part (2) through a straight-shaped part mould (8), and forming an integral mould group by the reversed C-shaped part mould (5), the reversed Z-shaped part mould (7) and the straight-shaped part mould (8) during splicing;

F. cured J-shaped composite material reinforcing rib

And placing the integral die set in a vacuum bag, placing the integral die set in a vacuum drying oven, continuously vacuumizing the vacuum drying oven while heating and curing, heating the vacuum drying oven from room temperature to a designed curing temperature, preserving the heat for a specified time under the condition of the curing temperature, naturally cooling to room temperature, and then demolding.

2. The method of manufacturing a J-shaped composite reinforcing bar according to claim 1, wherein: the time duration t is 10 +/-1 min.

Technical Field

The invention relates to a manufacturing method of a J-shaped composite material reinforcing rib, and belongs to the field of manufacturing of composite material structural members.

Background

The carbon fiber resin matrix composite material has the advantages of high specific strength, high specific rigidity, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability and the like, and is a high-performance structural material which is widely applied in the fields of aviation, aerospace, traffic and the like at present. With the trend of integration and integration of composite materials in the field of aviation, the variety of composite material parts is increasingly diversified, the structural forms are increasingly diversified, and the forming mechanism and the influencing factors are more complicated. The reinforcing rib made of the composite material with the J-shaped section has the following problems in the prior art in the process of forming by adopting the thermal diaphragm due to the influence of the special structural form (divided into an inverted C-shaped part, an inverted Z-shaped part, a straight-shaped part and a core material according to the design configuration) and the layer-by-layer paving and forming process:

1. the layer-by-layer laying forming efficiency adopted by the prior art is low, and the batch production is not facilitated.

2. Because the inverted Z-shaped blank laying die is in a double right-angle shape, when the thermal diaphragm is used for forming and laying, the vertical angle part of the inverted Z-shaped deep cavity easily generates a bridging diaphragm which cannot be completely attached to the die, the size of the formed R angle is not in accordance with the required size, and the laying effect is poor.

3. The fillet department fold, mix with and bubble phenomenon appear easily, influence product quality.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to design the manufacturing method of the J-shaped composite material reinforcing rib, which is easy to realize batch production, can solve the problems of non-lamination of a bridge and fillet wrinkling, inclusion and air bubbles during the forming of the reverse Z-shaped part diaphragm, and finally forms the J-shaped composite material reinforcing rib with the R-shaped angle size meeting the requirement and good product quality.

In order to achieve the purpose, the technical scheme of the invention is as follows: a manufacturing method of a J-shaped composite material reinforcing rib comprises a reversed C-shaped part, a reversed Z-shaped part and a straight-shaped part, wherein round corners R transition is formed between an upper transverse edge and a straight edge of the reversed C-shaped part, between a straight edge and a lower transverse edge of the reversed Z-shaped part, between the upper transverse edge and the straight edge of the reversed Z-shaped part, between the straight edge and the lower transverse edge of the reversed Z-shaped part, between the round corners R transition is formed, the straight edge of the reversed C-shaped part is connected with the straight edge of the reversed Z-shaped part, between the lower transverse edge of the reversed C-shaped part and the lower transverse edge of the reversed Z-shaped part, between the left side and the right side of the straight-shaped part and the upper transverse edge of the reversed Z-shaped part are respectively connected with the upper transverse edge of the reversed C-shaped part and the upper transverse edge of the reversed Z-shaped part, and triangular areas between the upper transverse edges of the reversed Z-shaped part are core materials.

The manufacturing method comprises the following steps:

A. preparation of planar preforms

The method comprises the following steps of preparing a carbon fiber composite material plane prefabricated body by adopting a vacuum bag method, wherein the carbon fiber composite material plane prefabricated body comprises a straight-line-shaped piece plane prefabricated body, an inverse C-shaped piece plane prefabricated body and an inverse Z-shaped piece plane prefabricated body, and the sizes of the straight-line-shaped piece plane prefabricated body, the inverse C-shaped piece plane prefabricated body and the inverse Z-shaped piece plane prefabricated body meet the design requirements, and the method comprises the following specific steps:

a1, paving an isolation cloth on the flat plate;

a2, laying 2-3 layers of carbon fiber composite prepreg on a piece of isolation cloth;

a3, covering an isolation cloth and an air felt on the upper layer of the carbon fiber composite prepreg;

a4, placing a vacuum bag on the air-permeable felt and sealing the periphery of the flat plate by using a sealing adhesive tape;

a5, keeping the vacuum bag for a time t after vacuum pumping, and removing air between prepreg layers of the carbon fiber composite material;

a6, taking down the isolation cloth, the air-permeable felt and the vacuum bag; if the thickness requirement of the carbon fiber composite material plane prefabricated body is met, turning to the step B; otherwise, continuously laying 2-3 layers of carbon fiber composite prepreg on the original carbon fiber composite prepreg; turning to step A3;

B. prefabricated body for forming I-shaped part

Placing the straight-shaped piece plane prefabricated body on a straight-shaped piece mold, and integrally transferring the straight-shaped piece plane prefabricated body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the duration is t;

C. prefabricated body for forming reverse C-shaped part

Placing the reverse C-shaped piece plane prefabricated body on a reverse C-shaped piece mold according to the design size requirement; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the reverse C-shaped part die is rectangular, and two corners in contact with the reverse C-shaped part prefabricated body are rounded corners R;

D. prefabricated body for forming reverse Z-shaped part

D1, placing the reverse Z-shaped part plane prefabricated body on a reverse Z-shaped part semi-finished product matched mould according to the design size requirement; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the semi-finished product matched mould of the inverted Z-shaped part is polygonal, the left side edge consists of an upper vertical edge, a bevel edge and a lower vertical edge, the angle between the upper vertical edge and the bevel edge is 120-160 degrees, the upper edge and the lower edge are both horizontal edges, and the right side edge is a vertical edge; the joint of the upper vertical edge and the upper edge is in rounded corner R transition;

d2, turning the semi-finished product of the reverse Z-shaped piece, and transferring the semi-finished product to a mold of the reverse Z-shaped piece; integrally transferring the whole body to a thermal diaphragm platform for heating, vacuumizing and forming, wherein the time is t; the cross section of the reverse Z-shaped part die is polygonal, the left side edge consists of an upper vertical edge, a middle horizontal edge and a lower vertical edge, a round corner R is formed between the upper vertical edge and the middle horizontal edge for transition, the upper edge and the lower edge are both horizontal edges, and the right side edge is a vertical edge; the joint of the upper vertical edge and the upper edge is in rounded corner R transition;

E. spliced J-shaped composite material reinforcing rib

The straight edges of the reverse C-shaped part and the reverse Z-shaped part are spliced together through a reverse C-shaped part die and a reverse Z-shaped part die, core materials are filled in triangular areas where the reverse C-shaped part and the reverse Z-shaped part are spliced and connected, then the straight parts are spliced on the upper transverse edges of the reverse C-shaped part and the reverse Z-shaped part through a straight part die, and when the reverse C-shaped part die, the reverse Z-shaped part die and the straight part die are spliced, the reverse C-shaped part die, the reverse Z-shaped part die and the straight part die form an integral die set.

F. Cured J-shaped composite material reinforcing rib

And placing the integral die set in a vacuum bag, placing the integral die set in a vacuum drying oven, continuously vacuumizing the vacuum drying oven while heating and curing, heating the vacuum drying oven from room temperature to a designed curing temperature, preserving the heat for a specified time under the condition of the curing temperature, naturally cooling to room temperature, and then demolding.

Further, the time period t is 10 +/-1 min.

Compared with the prior art, the invention has the following beneficial effects:

1. the carbon fiber composite material preform is prepared by a method of laying 2-3 layers of prepreg once and laying for multiple times, so that the problem of low forming efficiency of laying layer by layer is solved.

2. The invention divides the prefabricated body of the reverse Z-shaped part into two steps for forming, wherein the obtuse angle design of the semi-finished product of the reverse Z-shaped part matched with the mould ensures that the diaphragm can compact the prefabricated body to the surface of the mould without bridging in the thermal diaphragm forming process, thereby overcoming the problem that the thermal diaphragm cannot be formed in the structure of the similar deep cavity.

3. The invention solves the problem of air bubbles between prepreg layers by preparing the carbon fiber composite plane preform by a vacuum bag method, solves the problem of the generation of wrinkles in an R-angle area by a thermal diaphragm forming mode, and realizes the high-quality and high-efficiency manufacture of the J-shaped composite reinforcing rib.