阅读说明：本技术 一种使用浇注模具进行复合材料的热固化补缩工艺 (Hot curing feeding process for composite material by using casting mold ) 是由 张丽珍 徐梁山 张树华 于 2021-09-07 设计创作，主要内容包括：本发明提供了一种使用浇注模具进行复合材料的热固化补缩工艺,S1、浇注前对浇注模具预烘；S2、将浇注模具移至真空浇注生产线中的真空浇注罐进行真空浇注；S3、将浇注模具移至烘箱中初固化；S4、初固化产品移至烘箱中进行后固化至产品完成；避免真空浇注成型工艺产品的因固化收缩而补料不及时或补料通道堵塞而产生的缺陷,实现了分层凝胶,操作简便、有效,不需定时补料,且补料的效果有保障。(The invention provides a thermosetting feeding process for a composite material by using a casting mould, and the casting mould is pre-dried before casting S1; s2, moving the casting mold to a vacuum casting tank in a vacuum casting production line for vacuum casting; s3, moving the casting mold to an oven for primary curing; s4, transferring the primary cured product into an oven for post-curing until the product is finished; the defects of untimely material supplement or material supplement channel blockage caused by solidification shrinkage of a vacuum casting molding process product are avoided, layered gel is realized, the operation is simple, convenient and effective, timed material supplement is not needed, and the material supplement effect is guaranteed.)

1. A hot curing feeding process for a composite material by using a casting mold is characterized by comprising S1, pre-baking the casting mold before casting; s2, moving the casting mold to a vacuum casting tank in a vacuum casting production line for vacuum casting; s3, moving the casting mold to an oven for primary curing; s4, transferring the primary cured product into an oven for post-curing until the product is finished;

the pouring mould is a box body, the top surface of the pouring mould is set to be a flat top or an arc top, an inverted round platform-shaped opening is arranged at the center of the upper part of the pouring mould, a mould interlayer is arranged on the upper part of the pouring mould, a liquid feeding port and a liquid discharging port are arranged on the mould interlayer, the liquid feeding port is arranged on the upper part of the mould interlayer, the liquid discharging port is arranged on one side of the mould interlayer, and the top surface of a mould cavity inside the pouring mould is set to be the flat top or the arc top.

2. The process for thermal curing feeding of composite material using casting mold according to claim 1, wherein the pre-baking in S1 is performed in an oven set at 120 ± 5 ℃.

3. The process of claim 1, wherein a coolant is added to the mold sandwich layer after the step of S1 and before the step of S2, and there is a space for thermal expansion of the coolant.

4. The process for thermal curing feeding of composite material using casting mold according to claim 1, wherein the initial curing of step S3 is performed in an oven at 120 ± 5 degrees celsius, and the temperature of the initial curing is continuously increased due to exothermic reaction until the maximum temperature of exothermic peak is controlled at 140 to 150 degrees celsius.

5. The process of claim 1, wherein the post-curing is performed at 130 ± 5 ℃ in step S4.

6. The process for thermal curing feeding of composite materials using a casting mold according to claim 1, wherein the filling opening is provided with one or two, and the tapping opening is an open tapping opening.

7. The process of claim 1, wherein the filling opening is an open filling opening or a closed filling opening cap is added for sealing, and the closed filling opening cap is a detachable structure.

8. The process of claim 3, wherein the cooling liquid has a boiling point lower than the initial solidification temperature and is less volatile.

Technical Field

The invention relates to the technical field of material processing, in particular to a thermosetting feeding process for a composite material by using a casting mold.

Background

The existing electric power products mostly adopt epoxy resin composite materials to carry out vacuum pouring process or pressure gel process curing molding, the two processes have advantages and disadvantages, the vacuum pouring molding process is to remove the defect of bubbles generated by the materials due to the self-bringing and stirring of the materials through the vacuum burdening tank and the vacuum degassing of the vacuum pouring tank of a vacuum pouring production line and then move the materials to an oven for normal pressure curing, and the process is suitable for the production of products with small product batches; the pressure gel forming process is characterized in that the defect that bubbles are generated due to the fact that materials are brought in and stirred is eliminated through degassing of a vacuum mixing tank, then the materials are fed in a mode of pressurizing a mold, the pressure is kept until products are primarily cured and formed in the mold, the products can be supplemented due to the fact that the composite materials shrink caused by curing reaction in the mold in the pressure maintaining process, the shrinkage defect of the products is avoided, and the process is suitable for mass production of the same products. The curing reaction feeding means of the composite material in the curing process of the vacuum casting molding process achieves the feeding purpose by the material flowing into the mold through the sprue. The feeding method of the existing vacuum casting molding process generally comprises the steps of adding materials with the same formula and lower curing degree than that of materials in a mold into a gate in a dividing mode in the initial curing process of the materials, so that the newly added materials are slower than the curing speed of the materials in the mold and can flow into the mold from the gate to feed. This method is cumbersome and not easy to master, and it is impossible to compensate for the defect when the material shrinkage part hinders the feeding of the feeding material added after the gate due to the gel of the material poured first (i.e., the feeding channel is blocked).

Disclosure of Invention

Aiming at the technical problems, the invention provides a thermosetting feeding process for a composite material by using a casting mould, which can overcome the defects caused by curing shrinkage of the composite material in the conventional vacuum casting process.

A thermal curing feeding process for a composite material by using a casting mold comprises S1, pre-baking the casting mold before casting; s2, moving the casting mold to a vacuum casting tank in a vacuum casting production line for vacuum casting; s3, moving the casting mold to an oven for primary curing; and S4, transferring the primary cured product to an oven for post-curing until the product is finished.

The pouring mould is a box body, the top surface of the pouring mould is set to be a flat top or an arc top, an inverted round platform-shaped opening is arranged at the center of the upper part of the pouring mould, a mould interlayer is arranged on the upper part of the pouring mould, a liquid feeding port and a liquid discharging port are arranged on the mould interlayer, the liquid feeding port is arranged on the upper part of the mould interlayer, the liquid discharging port is arranged on one side of the mould interlayer, and the top surface of a mould cavity inside the pouring mould is set to be the flat top or the arc top.

Further, the pre-baking in S1 is performed in an oven, and the temperature is set to 120 ± 5 ℃.

Further, after the step S1 and before the step S2, a cooling liquid is added into the mold sandwich layer, and a space is left for the cooling liquid to thermally expand.

Further, the initial curing of the step S3 is performed in an oven at 120 ± 5 degrees celsius, and the temperature of the initial curing is continuously increased due to the exothermic reaction until the maximum temperature of the exothermic peak is controlled at 140 to 150 degrees celsius.

Further, in the step S4, the temperature for post-curing is controlled to be 130 ± 5 ℃.

Furthermore, one or two liquid adding ports are arranged, and the liquid discharging port is an open type liquid discharging port.

Further, the filling opening is an open filling opening or a closed filling opening blanking cover is additionally arranged for sealing, and the closed filling opening blanking cover is of a detachable structure.

Further, the cooling liquid has a boiling point lower than the initial solidification temperature and is less volatile.

The thermosetting feeding process for the composite material by using the casting mold has the following beneficial effects:

1. the product produced by curing and molding the epoxy resin composite material by adopting the process avoids the defects of untimely material supplement or material supplement channel blockage caused by curing shrinkage of the vacuum casting molding process product. The gel is layered, the upper layer of the obtained cooling gel is later than the middle layer and the lower layer of the obtained cooling gel, the instant gel supplement is realized, the processing quality is greatly improved, the control is easy, the reliability is high, and the problems in the prior art are perfectly solved.

2. The product produced by curing and molding the epoxy resin composite material by adopting the process is simple and effective to operate, does not need to supplement materials at regular time, and has a guaranteed supplementing effect.

3. The interlayer can be opened by the cooling liquid applied in the interlayer of the process, the cooling liquid is conveniently added according to the required time or variety, and the opening is suitable when the cost of the cooling liquid is low (such as water); the interlayer can also be made into a closed type, and the cooling liquid with higher cost can be recycled by avoiding pollution and reducing volatilization.

4. The volume of the die interlayer is variable, the interface with the die cavity can be designed to be flat top or arc shape, the replacement is flexible, the cooling area is increased, the gel is layered according to the requirement, and the processing quality of the product is controlled.

Drawings

FIG. 1 is an embodiment of a casting mold of the present invention;

FIG. 2 is a second embodiment of the casting mold of the present invention;

FIG. 3 is a third embodiment of the casting mold of the present invention;

in the figure: 1. pouring a mold; 2. a mold gate; 3. a mold interlayer; 4. a mold cavity; 5. an open liquid adding port; 6. a closed liquid filling opening blocking cover; 7. and (4) opening the tapping hole.

Detailed Description

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.

The invention aims to solve the technical problem of providing a pouring feeding process of a vacuum pouring molding process, and avoiding the defects of untimely feeding or feeding channel blockage of a vacuum pouring molding process product due to solidification shrinkage. The method is simple and effective, and has no need of feeding materials at regular time, and the feeding effect is ensured.

Comprising S1, pre-baking the casting mould 1 before casting; s2, moving the casting mold 1 to a vacuum casting tank in a vacuum casting production line for vacuum casting; s3, moving the casting mold 1 to an oven for primary curing; and S4, transferring the primary cured product to an oven for post-curing until the product is finished.

Before products (or raw materials, most of the raw materials adopt epoxy composite materials) are cast, a casting mold 1 is pre-baked and placed in a baking oven at 120 +/-5 ℃, after the process requirement meets the casting condition, the casting mold 1 is moved to a vacuum casting tank in a vacuum casting production line for vacuum casting, after the step S1 and before the step S2, cooling liquid is added into a mold interlayer 3, and a space for thermal expansion of cooling liquid is reserved. And then carrying out primary curing, wherein the casting mold 1 in which the epoxy resin composite material is cast is placed in an oven at 120 +/-5 ℃ for primary curing, the curing temperature of the epoxy resin composite material is higher than the boiling point of water, and the highest temperature of an exothermic peak is controlled to be 140-150 ℃ due to the continuous rise of the exothermic reaction temperature in the primary curing.

The gradual gelling of the oxygen resin composite material leads to the increasingly poor fluidity, and the cooling of the cooling liquid is arranged around the mold gate 2 and the upward surface of the casting mold 1, so the material of the mold gate 2 and the material near the upward surface of the casting mold 1 are gelled later than other materials, the material of the middle layer and the lower layer is gelled firstly because of the higher temperature, the shrinkage generated by the solidification in the gelling process is compensated because the upper layer material is not gelled, the shrinkage generated by the material near the upper layer after the compensation of the middle layer and the lower layer and the self subsequent gelling is timely compensated by the material in the mold gate 2, the material of the late gelling is gradually gelled and solidified initially because of the heat generated by the exothermic reaction when the material of the middle layer and the lower layer is gelled, and the defects caused by the solidification shrinkage of the whole product can not be generated. And (5) transferring the primary cured product into an oven for post-curing until the product is finished. The temperature at which the post-curing is performed is controlled to 130 ± 5 ℃.

Referring to fig. 1-3, the three embodiments of the casting mold 1 of the present invention are not limited to the requirements, and the shapes of the filling opening, the mold interlayer 3, the mold cavity 4 and the case body can be flexibly designed according to the actual situation.

The pouring mould 1 is a box body and can also be designed into the shape of a tank/barrel-shaped reaction kettle, the top surface of the pouring mould 1 is designed into a flat top or an arc top, an inverted round platform-shaped opening is arranged at the center above the pouring mould 1 and is used as a mould pouring gate 2, a mould interlayer 3 is arranged at the upper part of the pouring mould 1, a liquid filling opening and a liquid discharging opening are arranged on the mould interlayer 3, the liquid filling opening is arranged at the upper part of the mould interlayer 3, the liquid discharging opening is arranged at one side of the mould interlayer 3, the top surface of a mould cavity 4 in the pouring mould 1 is designed into the flat top or the arc top, the design of the arc top is designed to increase the cooling area of cooling liquid so as to enhance the cooling effect, but the gel layering of the material has little difference, and the pouring mould is changed/replaced according to the actual use requirement. The boiling point of the cooling liquid is lower than the initial solidification temperature, and the cooling liquid is not easy to volatilize.

One or two liquid filling ports are arranged, and the liquid discharging port is an open type liquid discharging port 7. The filling opening is an open filling opening 5 or a closed filling opening blanking cover 6 is additionally arranged for sealing, and the closed filling opening blanking cover 6 is of a detachable structure.

According to the thermosetting feeding process for the composite material by using the casting mold 1, the product produced by curing and molding the epoxy resin composite material by adopting the process avoids the defects of untimely feeding or feeding channel blockage caused by curing and shrinkage of the product of the vacuum casting molding process. The gel is layered, the upper layer of the obtained cooling gel is later than the middle layer and the lower layer of the obtained cooling gel, the instant gel supplement is realized, the processing quality is greatly improved, the control is easy, the reliability is high, and the problems in the prior art are perfectly solved. The product produced by curing and molding the epoxy resin composite material by adopting the process is simple and effective to operate, does not need to supplement materials at regular time, and has a guaranteed supplementing effect. The cooling liquid in the die interlayer 3 applied to the process can open the die interlayer 3, so that the cooling liquid can be conveniently added according to required time or variety, and the open type is suitable when the cost of the cooling liquid is low (such as water); the interlayer can also be made into a closed type, and the cooling liquid with higher cost can be recycled by avoiding pollution and reducing volatilization. The volume of the die interlayer 3 is variable, the interface with the die cavity 4 of the die can be designed to be flat top or arc shape, the replacement is flexible, the cooling area is increased, the gel is layered according to the requirement, and the processing quality of the product is controlled.

While the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.