CN112454761A - Forming die of hollow rubber die and preparation method thereof - Google Patents

Forming die of hollow rubber die and preparation method thereof Download PDF

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Publication number
CN112454761A
CN112454761A CN202011139969.9A CN202011139969A CN112454761A CN 112454761 A CN112454761 A CN 112454761A CN 202011139969 A CN202011139969 A CN 202011139969A CN 112454761 A CN112454761 A CN 112454761A
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CN
China
Prior art keywords
mold
die
rubber
forming
film
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CN202011139969.9A
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Chinese (zh)
Inventor
高艳秋
赵龙
王海雷
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AVIC Beijing Aeronautical Manufacturing Technology Research Institute
AVIC Manufacturing Technology Institute
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AVIC Beijing Aeronautical Manufacturing Technology Research Institute
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Priority to CN202011139969.9A priority Critical patent/CN112454761A/en
Publication of CN112454761A publication Critical patent/CN112454761A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/38Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842Manufacturing moulds, e.g. shaping the mould surface by machining

Abstract

The invention relates to a forming die of a hollow rubber die and a preparation method thereof, wherein the forming die comprises a die body, a bearing plate and a connecting piece; the die body is provided with a groove matched with the cross-sectional outer profile of the hollow rubber die along the length direction, two sides of the groove are provided with platform areas, and the connecting piece is arranged in the platform areas and used for connecting the die body and the bearing plate. The forming die of the hollow rubber die and the preparation method thereof aim to solve the problem of the stability of the section size of the hollow rubber die.

Description

Forming die of hollow rubber die and preparation method thereof
Technical Field
The invention relates to the technical field of composite material manufacturing, in particular to a forming die of a hollow rubber die and a preparation method thereof.
Background
The hat-shaped stiffened composite wallboard has better structural rigidity, and is a wallboard structure commonly adopted by composite wallboards of airplanes. The forming method is that the cap-shaped reinforcement and the skin are respectively cured and formed, and then the cap-shaped reinforcement wall plate structure is formed by adopting a fastener for mechanical connection or by a gluing mode. However, with the increase of the using amount of the composite material, higher index requirements are provided for the weight reduction efficiency and the cost of the composite material structure, and the development trend that the composite material structure is integrally formed into the composite material is realized. Compared with J-shaped, T-shaped and I-shaped reinforced wall plates, the cap-shaped rib and the skin of the cap-shaped reinforced integral wall plate form a structure with an unopened cavity, and the cap-shaped rib and the skin in the cavity are pressurized and demoulded after curing during integral forming, so that the difficulty in realizing the integral forming of the cap-shaped reinforced wall plate is solved. If a rigid mold is adopted in the cavity according to a conventional method, demolding cannot be carried out after curing, and even though the solid rubber mold can be used for demolding, uniform pressurization cannot be realized on the uncovered area of the cap-shaped rib. In recent years, the cap-shaped reinforced wall plate integrally formed by sewing/RFI adopts a hollow rubber mold in a cap-shaped reinforced cavity, so that the pressurization of a non-open area of a cap-shaped rib is realized, the mold is easy to remove after curing and forming, the forming quality is reliable and stable, and the cap-shaped reinforced wall plate becomes a main mold form adopted by the inner cavity of the cap-shaped rib when the cap-shaped reinforced wall plate is integrally formed. For the molding of the hollow rubber mold, a pultrusion process is tried, but through a large number of experiments, the process parameters of the rubber mold molded by the pultrusion process at present are not mastered, and the cross section size of the rubber mold pultruded by the same pultrusion mold has larger deviation, so that the molded rubber mold and the cap-shaped rib prefabricated part cannot be well matched, the coordination requirement of the cap-shaped rib and the skin cannot be met at the present stage, and further research and research are needed. Under the condition, the hollow rubber mold required by the cavity of the integral wall plate is vulcanized and formed by adopting a hot pressing process, so that the integral forming requirement of the existing hat-shaped reinforced integral wall plate structure is met.
Therefore, the inventor provides a forming die of a hollow rubber die and a preparation method thereof.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides a forming die of a hollow rubber die and a preparation method thereof, which solves the technical problem of the stability of the section size of the hollow rubber die by designing the forming die of the hollow rubber die according to the structural characteristics and the size of the hollow rubber die, presetting a rubber sheet according to the forming die, and packaging and vulcanizing the rubber sheet to form the hollow rubber die.
(2) Technical scheme
The first aspect of the embodiment of the invention provides a forming die of a hollow rubber die, which comprises a forming die of a single rubber die and forming dies of a plurality of rubber dies, wherein the forming dies of the single rubber die and the forming dies of the plurality of rubber dies are of combined structures and comprise die bodies, bearing plates and connecting pieces;
the die body is provided with a groove matched with the cross-sectional outer profile of the hollow rubber die along the length direction of the die body, platform areas are arranged on two sides of the groove, and the connecting piece is arranged in the platform areas and used for connecting the die body and the bearing plate.
Further, when the forming die is a forming die of a single rubber die, the length and the width of the die body and the bearing plate are consistent;
the length of the die body is prolonged by the length of the hollow rubber die, the prolonging amount is larger than or equal to the shrinkage of the hollow rubber die, the thickness of the pressure bearing plate is-mm, and the allowable butt joint gap in the length direction is not more than mm.
Further, when the forming mold is a plurality of rubber mold forming molds, the mold body comprises a plurality of areas, and the grooves with the same section height and the bearing plates corresponding to the grooves one to one are arranged in the same area;
the width of the bearing plate of each area is prolonged according to the length of the longest hollow rubber mold required to be molded in the area at the outer edge of the platform area of the groove on the two sides of the area, and the prolonging amount is larger than or equal to the shrinkage amount of the longest hollow rubber mold.
Furthermore, the length of the die body is at least mm longer than that of the bearing plate with the longest length, and the width of the die body is at least mm wider than that of the outer edge of the platform area of the groove on the outermost side of the die body.
A second aspect of embodiments of the present invention provides a method of manufacturing a molding die for a hollow rubber mold, the method including the steps of:
cutting the set rubber into rubber sheets according to the size of the prepared hollow rubber mold;
after an outer side isolation film and an inner side isolation film are respectively adhered to two surfaces of the rubber sheet, the rubber sheet is laid and preshaped in a mold body, a first breathable material and a first vacuum film are sequentially laid in the inner side isolation film, and a support body is placed;
screwing the bearing plate by using a connecting piece and fixing the bearing plate at a corresponding position of the die body;
laying a second air-permeable material and a second vacuum film, and sealing to form a vacuum system.
Further, lay and the presetting after respectively pasting the both sides of sheet rubber establishes outside barrier film and inboard barrier film the sheet rubber is in the mould, lay first ventilative material and first vacuum film in proper order in the inboard barrier film, place the supporter, specifically include:
when the forming die is a single rubber die forming die, two side edges of the first vacuum film are bonded;
sequentially overlapping, paving and positioning the breathable material and the inner side isolating film which are positioned at the upper part of the cavity of the die body;
and after the rubber sheet is lapped on the upper part of the cavity, lapping, flattening and positioning the outer side isolation film positioned on the upper part of the cavity of the die body.
Further, lay and the presetting after respectively after outer barrier film and inboard barrier film are established in the two sides subsides of sheet rubber the sheet rubber is in the mould, lay first ventilative material and first vacuum film in proper order in the inboard barrier film, place the supporter, specifically still include:
when the forming mold is a multi-rubber mold forming mold, bonding two ends of the first vacuum film to the bottom surface and the side surface of two ends of the cavity of the mold body;
bonding two side edges of the first vacuum film positioned at the upper part of the cavity, and sequentially overlapping, paving and positioning the first breathable material positioned at the upper part of the cavity and the inner side isolation material;
and after the rubber sheets are lapped at the upper part of the cavity, lapping, flattening and positioning the outer side isolation material.
Further, the adhering the first vacuum film and the second vacuum film to two ends of the cavity of the mold body to form a vacuum system in a sealed manner specifically includes:
when the forming mold is a single rubber mold forming mold, the forming mold is fully covered to a plurality of single rubber molds, a second air-permeable material and the second vacuum film are laid, the first vacuum film and the second vacuum film are bonded at two ends by sealing rubber strips, and two side edges of the second vacuum film are bonded and sealed by the sealing rubber strips to form a vacuum system.
Further, the adhering the first vacuum film and the second vacuum film to two ends of the cavity of the mold body to form a vacuum system in a sealed manner specifically includes:
when the forming mold is a multi-rubber mold forming mold, laying the second air-permeable material and the second vacuum film, bonding the second vacuum film with the mold body at two sides of the mold body, and sealing the second vacuum film, the first vacuum film and the mold body by using sealing rubber strips at two ends of the mold body at two ends to form a vacuum system.
(3) Advantageous effects
In summary, the invention designs the forming mold of the hollow rubber mold according to the structural characteristics and the size of the hollow rubber mold, pre-shapes the rubber sheet according to the forming mold, and encapsulates and vulcanizes the rubber sheet to form the hollow rubber mold. The hollow rubber mold prepared by the forming mold has stable external section size, good matching consistency with a non-open area cavity of a composite material workpiece, reliable use of the mold and capability of more reliably ensuring the forming quality of the composite material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a forming mold of a hollow rubber mold according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another hollow rubber mold forming mold according to an embodiment of the present invention;
FIG. 3 is a schematic sectional view of a hollow rubber mold in example 1 of the present invention;
FIG. 4 is a schematic view showing a method for producing a hollow rubber mold according to example 1 of the present invention;
FIG. 5 is a schematic view showing a method for producing a hollow rubber mold in example 2 of the present invention;
FIG. 6 is an enlarged view taken at A in FIG. 5;
FIG. 7 is an enlarged view at B in FIG. 5;
fig. 8 is a schematic flow chart of a method for manufacturing a hollow rubber mold according to an embodiment of the present invention.
In the figure:
1-a mold body; 101-a groove; 2-a bearing plate; 3-a connector; 4-rubber sheet; 5-outer barrier film; 6-inner side isolation film; 701-a first vacuum film; 702-a second vacuum film; 801-a first breathable material; 802-a second breathable material; 9-sealing rubber strips; 10-hollow rubber membrane; 11-a frame; 12-a support.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of a forming mold of a hollow rubber mold according to an embodiment of the present invention, and as shown in fig. 1, according to a first aspect of an embodiment of the present invention, a forming mold of a hollow rubber mold is provided, which includes two types, namely a forming mold of a single rubber mold and a forming mold of multiple rubber molds, each of which adopts a combined structure, including a mold body 1, a pressure-bearing plate 2 and a connecting member 3; the die body 1 is provided with a groove 101 matched with the cross-sectional outer profile of the hollow rubber die along the length direction, two sides of the groove 101 are provided with platform areas, and the connecting piece 3 is arranged in the platform areas and used for connecting the die body 1 and the bearing plate 2.
In this embodiment, if the number of the hollow rubber molds is small and the batch size is small, the rubber mold forming mold can be designed to be a single rubber mold forming mold for each hollow rubber mold, and if the number of the hollow rubber molds required to be formed is large and the batch size is large, the rubber mold forming mold is designed to be a multi-rubber mold forming mold.
The forming die of single rubber mould and the forming die of many rubber moulds all design for integrated configuration, comprise die body 1, bearing plate 2 and connecting piece 3, and bearing plate 2 passes through connecting piece 3 to be connected and fixes on die body 1. For the forming die of a plurality of rubber dies, in order to ensure the rigidity of the die body 1, the forming die can be designed into a frame structure, the die body 1 is welded on a frame 11, and the die body 1 requires air tightness.
For the forming die of a single rubber die, a through long groove is designed on a die body 1 according to the size of the outer profile of the cross section of the formed rubber die, platform areas are designed on the two sides of the groove and used for connecting a die body 1 and a bearing plate 2 through a connecting piece 3, and the width of each platform area needs to meet the requirement of the connecting piece 3 on the connection of the bearing plate 2 and the die body 1.
For a forming die of a plurality of rubber dies, through long grooves with the same number are designed on a die body 1 according to the number of rubber dies to be formed, the size of a cavity of each groove is designed in the same area according to the size of the outer profile of the cross section of the corresponding rubber die, grooves with the same height of the cross section are designed in the same area, platform areas are designed on two sides of each groove, each platform area is used for connecting the die body 1 and a bearing plate 2 through a connecting piece 3, and the width of each platform area needs to meet the requirement of the connecting piece 3 on the connection of the bearing plate 2 and the die body 1.
For the forming die of a single rubber die, the length and the width of the die body 1 and the bearing plate 2 are consistent, the length is prolonged according to the length of the rubber die, the extending amount is not less than the shrinkage of the rubber die, and the width is according to the outer edges of the platform areas at two sides of the groove of the die body 1. The recommended thickness of the bearing plate 2 is 2 mm-5 mm, the length direction allows butt joint, and the allowed butt joint clearance is not more than 1 mm.
For the forming die of a plurality of rubber dies, a bearing plate 2 is respectively designed for each height area on a die body 1, the length of the bearing plate 2 of each area is prolonged according to the length of the longest hollow rubber die to be formed in the area, the prolonging amount is not less than the shrinkage of the longest hollow rubber die, and the width is according to the outer edge of a platform area of grooves at two sides of the area. The length of the die body 1 is respectively prolonged by not less than 20mm at two ends according to the length of the longest bearing plate 2, and the width is respectively widened by not less than 20mm according to the outer edge of the platform area of the outermost groove on the die body. The bearing plate 2 of each area may be formed by a combination of a plurality of pieces, allowing a gap of not more than 1mm, and it is recommended that the thickness of the bearing plate 2 is 2mm to 5 mm.
As a preferred embodiment, when the forming mold is a forming mold of a single rubber mold, the length and the width of the mold body 1 and the bearing plate 2 are consistent.
In a preferred embodiment, the length of the mold body 1 is extended by the length of the hollow rubber mold by an amount equal to or greater than the shrinkage of the hollow rubber mold.
As a preferred embodiment, the thickness of the pressure bearing plate 2 is 2-5mm, and the allowable butt joint clearance in the length direction is less than or equal to 1 mm.
As a preferred embodiment, when the forming mold is a multi-rubber mold forming mold, the mold body 1 includes a plurality of areas, and the grooves 101 with the same cross-sectional height and the pressure-bearing plates 2 corresponding to the grooves are disposed in the same area.
As a preferred embodiment, the length of the pressure bearing plate 2, of which the mold body 1 has the longest length, is extended by at least 20mm at both ends, respectively, and the width of the mold body 1 is widened by at least 20mm at the outer edges of the land areas of the outermost recesses 101 thereon, respectively.
A second aspect of an embodiment of the present invention provides a method for manufacturing a forming mold based on the above hollow rubber mold, as shown in fig. 8, the method including the steps of:
s1, cutting the set rubber into rubber pieces 4 according to the size of the prepared hollow rubber mold.
In the step, the hollow rubber mold is prepared by adopting the AIRPAD rubber, the AIRPAD rubber is cut into the rubber sheet 4 according to the size of the prepared rubber mold, the width of the rubber sheet 4 is not less than the circumference of the section of the formed rubber mold and is increased by 5mm, and the length is according to the length of the corresponding area bearing plate 2.
S2, after the outer side isolation film 5 and the inner side isolation film 6 are respectively adhered to two sides of the rubber sheet 4, the rubber sheet 4 is laid and pre-shaped in the mold body 1, the first air-permeable material 801 and the first vacuum film 701 are sequentially laid in the inner side isolation film 6, and a support body is placed.
In the step, after an A4000 outer side isolating film 5 and an A4000 inner side isolating film 6 are respectively paved on two sides of a rubber sheet 4, three molded surfaces which are pre-molded on the bottom surface and two side surfaces of a cavity of a die body 1 are paved and pre-molded. The inner side isolation film 6 is internally provided with a first air permeable material 801 and a first vacuum film 701 in sequence, and a support body 12 is placed.
And S3, screwing the bearing plate 2 by the connecting piece 3 and fixing the bearing plate at the corresponding position of the die body 1.
In this step, the connecting member 3 may be specifically a nut and a screw, as long as the fixed connection between the bearing plate 2 and the die body 1 can be realized, and the specific form is not limited.
S4, laying the second air-permeable material 802 and the second vacuum film 702, and sealing to form a vacuum system.
In the step, for a forming mold of a single rubber mold, a second air-permeable material 802 and a second vacuum film 702 are laid on the forming mold which completely covers one to a plurality of single rubber molds, the first vacuum film 701 and the second vacuum film 702 are bonded at two ends of a cavity through a sealing rubber strip 9, and two side edges of the second vacuum film 702 are bonded and sealed by the sealing rubber strip 9 to form a vacuum system;
for the forming mold of a plurality of rubber molds, sealing rubber strips 9 are adhered to two sides and two ends of a mold body 1, the sealing rubber strips 9 at the two ends are adhered to the upper part of a first vacuum film 701 at the two ends of a mold cavity, a second air-permeable material 802 is laid, a second vacuum film 702 is packaged, and the first vacuum film 701, the second vacuum film 702 and the mold body 1 are sealed to form a vacuum system.
As a preferred embodiment, in step S2, after the outer isolation film 5 and the inner isolation film 6 are respectively attached to both sides of the rubber sheet 4, the rubber sheet 4 is laid and pre-shaped in the mold body 1, the first air-permeable material 801 and the first vacuum film 701 are sequentially laid in the inner isolation film 6, and the support 12 is placed, specifically including:
when the forming mold is a single rubber mold forming mold, the first vacuum film 701 is bonded on the inner side isolation film 6, then the breathable material 8 and the inner side isolation film 6 which are positioned at the upper part of the cavity of the mold body 1 are sequentially lapped, paved and positioned, and then the rubber sheet 4 is lapped at the upper part of the cavity, and then the outer side isolation film 5 which is positioned at the upper part of the cavity of the mold body 1 is lapped, paved and positioned.
As a preferred embodiment, in step S2, after the outer isolation film 5 and the inner isolation film 6 are respectively attached to two sides of the rubber sheet 4, the rubber sheet 4 is laid and pre-shaped in the mold body 1, the first air-permeable material 801 and the first vacuum film 701 are sequentially laid in the inner isolation film 6, and the support 12 is placed, which specifically includes:
when the forming mold is a multi-rubber mold forming mold, a first vacuum film 701 is bonded to the bottom surface and the side surfaces of two ends of a cavity of a mold body 1, then two side edges of the first vacuum film 701, which are positioned at the upper part of the cavity, are bonded, a first breathable material 801 and an inner side isolation material 6, which are positioned at the upper part of the cavity, are sequentially lapped, laid and positioned, and then a rubber sheet 4 is lapped at the upper part of the cavity, and then an outer side isolation material 5 is lapped, laid and positioned.
As a preferred embodiment, in step S4, the second air-permeable material 802 and the second vacuum film 702 are laid and sealed to form a vacuum system, which specifically includes:
when the forming mold is a single rubber mold forming mold, the forming mold which covers 1 to a plurality of single rubber molds completely is paved with a second air-permeable material 802 and a second vacuum film 702, the two ends of the first vacuum film 701 and the second vacuum film 702 are bonded, and the two side edges of the second vacuum film 702 are bonded and sealed to form a vacuum system.
In a preferred embodiment, in step S4, the second air-permeable material 802 and the second vacuum film 702 are laid and sealed to form a vacuum system, and the method further includes:
when the forming mold is a multi-rubber mold forming mold, a second air-permeable material 802 and a second vacuum film 702 are laid, the second vacuum film 702 is bonded with the mold body 1 at two sides of the mold body 1, and the second vacuum film 702, the first vacuum film 701 and the mold body 1 are sealed at two ends of the mold bodies 1 at two ends to form a vacuum system.
The following specific examples further illustrate the invention in detail
Example 1
A unitary panel test piece with two hat-shaped ribs, size 1.2m by 0.7m, required hollow rubber die length 1.5m, isosceles trapezoid cross-section, shape and size as shown in figure 3. The forming die of the hollow rubber die is designed, the structural scheme of the forming die of a single rubber die is adopted, and the specific operation method comprises the following steps:
design of hollow rubber mould forming mould
a. The test pieces are small in batch, the quantity of the required hollow rubber dies is small, and the forming die of the hollow rubber dies is designed into the forming die of a single rubber die;
b. the forming die of the single rubber die is designed into a combined structure and comprises a die body 1, a bearing plate 2 and a connecting piece 3 as shown in figure 1, wherein the bearing plate 2 is fixedly connected on the die body 1 through the connecting piece 3;
c. designing a full-length groove 101 on a die body 1 of a forming die of a single rubber die according to the size of the outer profile of the cross section of the formed rubber die, and designing platform areas with the width of 12mm at two sides of the groove 101 for connecting the die body 1 and a bearing plate 2 by a connecting piece 3 as shown in figure 3;
d. the lengths and the widths of the die body 1 and the bearing plate 2 of the forming die of a single rubber die are consistent, the lengths of the die body and the bearing plate are prolonged by 30mm to 3030mm according to the lengths of the two rubber dies, and the widths of the die body and the bearing plate are 96mm according to the width of the outer edge of the platform area at two sides of the groove 101 of the die body 1. The bearing plate 2 is made of an aluminum plate with the thickness of 3mm, the length direction of the aluminum plate is divided into two butt joints, and the butt joint clearance is not more than 1 mm.
Preparation method of hollow rubber mold
a. Preparing a hollow rubber mold 10 by using AIRPAD rubber, cutting the AIRPAD rubber into rubber sheets 4 according to the size of the prepared rubber mold, wherein the width of each rubber sheet 4 is about 230mm after the allowance is added according to the perimeter of the cross section of the formed rubber mold, and the length of each rubber sheet 4 is 3030mm according to the length of a bearing plate 1 in a corresponding area;
b. as shown in fig. 4, after an a4000 outer side isolation film 5 and an inner side isolation film 6 are respectively laid on two sides of a rubber sheet 4, three molded surfaces of the bottom surface and two side surfaces of a cavity of a mold body 1 are laid and pre-molded, and a first air-permeable material 801 and a first vacuum film 701 are sequentially laid in the inner side isolation film 6;
c. for a forming die of a single rubber die, two side edges of a first vacuum film 701, which are positioned at the upper part of a cavity, are bonded by a sealing rubber strip 9; then, sequentially lapping, paving and positioning the first breathable material 801 and the inner side isolation film 6 which are positioned at the upper part of the cavity, and lapping, paving and positioning the outer side isolation film 5 which is positioned at the upper part of the cavity after the rubber sheet 4 is lapped at the upper part of the cavity;
d. assembling a bearing plate 2, and screwing and fixing the bearing plate at a corresponding position of the die body 1 by using a connecting piece 3;
e. and (3) laying a second air-permeable material 802 and a first vacuum film 701 in a full-covering manner on a forming die of a single rubber die, bonding the first vacuum film 701 and the second vacuum film 702 at two ends of a die cavity through a sealing rubber strip 9, and bonding and sealing two side edges of the second vacuum film 702 by the sealing rubber strip 9 to form a vacuum system.
Example 2
The hollow rubber mold with three section sizes is required for producing a part, four hollow rubber molds with each section are required, twelve hollow rubber molds with each section are required, the length of each rubber mold is 6100mm, the section is an isosceles trapezoid, and the shape and the size are shown in figures 5-8. The method for designing the forming die of the hollow rubber die required by part forming and preparing the rubber die comprises the following specific operation methods:
design of hollow rubber mould forming mould
a. Because the number of the hollow rubber molds required by part forming is large, and the hollow rubber molds are in batches, the rubber mold forming mold is designed into a forming mold with a plurality of rubber molds so as to improve the efficiency.
b. The forming mold of the plurality of rubber molds is designed to be a combined structure consisting of a mold body 1, a bearing plate 2, a connecting piece 3 and a frame 11, and as shown in fig. 2, the bearing plate 2 is connected and fixed on the mold body 1 through the connecting piece 3. In order to ensure the rigidity of the die body 1, the die body 1 is designed to be of a frame structure, the die body 1 is welded on a frame 11, and the requirement on the air tightness of the die body 1 is high.
c. Twelve through-length grooves 101 are designed on a die body 1 according to the sizes of the outer profiles of the sections of three rubber dies, the grooves 101 with the same section height are designed in the same area and divided into three areas with different heights, and platform areas with the width of 10mm are designed on two sides of each groove 101 and used for connecting the die body 1 and a bearing plate 2 through a connecting piece 3.
d. The bearing plates 2 are respectively designed for three height areas on the die body 1, the length of the bearing plate 2 in each area is 6200mm, and the width of the bearing plate 2 in each area is 251mm, 305mm and 337mm according to the outer edge of a platform area of the groove 101 on two sides of the area. The length of the die body 1 is respectively extended by 50mm at two ends according to the length of the bearing plate 2, and the two sides are respectively widened by 50mm according to the outer edge of the platform area of the outermost groove. The thickness of the bearing plate 2 of each area is 5mm, and three blocks are adopted in combination, so that the butt joint clearance is not more than 1 mm.
Preparation method of hollow rubber mold
a. The hollow rubber mold 10 is prepared by using AIRPAD rubber, the AIRPAD rubber is cut into rubber sheets 4 according to the size of the prepared rubber mold, the widths of the rubber sheets 4 with the three cross-sectional sizes are 165mm, 210mm and 230mm respectively, and the length is 6200 mm.
b. After an A4000 outer side isolating film 5 and an inner side isolating film 6 are respectively paved on two sides of the rubber sheet 4, three molded surfaces of the bottom surface and two side surfaces of the cavity of the die body 1 are paved and pre-molded. The first air-permeable material 801 and the first vacuum film 701 are sequentially laid in the inner side isolation film 6, and a support body is placed.
c. Adhering sealing rubber strips 9 to the bottom surfaces and the side surfaces of the two ends of the cavity of the die body 1, and adhering the two ends of the first vacuum film 701 to the bottom surfaces and the side surfaces of the two ends of the cavity of the die body 1; then, two sides of the first vacuum film 701 at the upper part of the cavity are bonded by a sealing rubber strip 9. Then, the first air-permeable material 801 and the inner side insulating material 6 positioned at the upper part of the cavity are sequentially lapped, paved and positioned, and after the rubber sheet 4 is lapped at the upper part of the cavity, the outer side insulating material 5 is lapped, paved and positioned.
d. And assembling the bearing plate 4, and screwing and fixing the bearing plate at a corresponding position of the die body 3 by using a connecting piece 5.
e. And sealing rubber strips 9 are adhered to two sides and two ends of the die body 3, the sealing rubber strips 9 at the two ends are adhered to the upper part of the first vacuum film 701 at the two ends of the die cavity, a second air-permeable material 802 is laid, the second vacuum film 702 is packaged, and the first vacuum film 701, the second vacuum film 702 and the die body 1 are sealed to form a vacuum system.
Compared with the prior art, the invention has the following advantages:
(1) the prepared hollow rubber mold has stable external section size, good matching consistency with a non-open area cavity of a composite material workpiece, reliable use of the mold and capability of more reliably ensuring the molding quality of the composite material;
(2) to the moulded die of many big cavity rubber moulds in batches of a large quantity, through the mode of same die body and bearing plate combination, not only realize the shaping of many rubber moulds simultaneously, the shaping is efficient, and the mould wholeness is good moreover, the rubber mould preparation of being more convenient for, and it is convenient and save the auxiliary material loss to encapsulate, is fit for the demand of engineering production in batches greatly.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (9)

1. A forming die of a hollow rubber die is characterized by comprising a forming die of a single rubber die and forming dies of a plurality of rubber dies, which are of combined structures and comprise a die body (1), a bearing plate (2) and a connecting piece (3);
the die body (1) is provided with a groove (101) matched with the cross-sectional outer profile of the hollow rubber die along the length direction of the die body, platform areas are arranged on two sides of the groove (101), and the connecting piece (3) is arranged in the platform areas and used for connecting the die body (1) and the bearing plate (2).
2. The forming mold of a hollow rubber mold according to claim 1, wherein when the forming mold is a forming mold of a single rubber mold, the length and width of the mold body (1) and the bearing plate (2) are consistent;
the length of the die body (1) is prolonged by the length of the hollow rubber die, the prolonging amount is larger than or equal to the shrinkage of the hollow rubber die, the thickness of the bearing plate (2) is 2-5mm, and the allowable butt joint gap in the length direction is less than or equal to 1 mm.
3. The forming mold of the hollow rubber mold according to claim 1, wherein when the forming mold is a plurality of rubber mold forming molds, the mold body (1) comprises a plurality of areas, and the grooves (101) with the same cross-sectional height and the pressure bearing plates (2) corresponding to the grooves are arranged in the same area;
the width of the bearing plate (2) of each area is prolonged according to the length of the longest hollow rubber die required to be molded in the area at the outer edge of the platform area of the groove on the two sides of the area, and the prolonging amount is larger than or equal to the shrinkage amount of the longest hollow rubber die.
4. The mold for molding a hollow rubber mold according to claim 3, wherein the length of the pressure bearing plate (2) having the longest length of the mold body (1) is extended by at least 20mm at both ends, respectively, and the width of the mold body (1) is widened by at least 20mm at the outer edge of the land area of the groove (101) at the outermost side thereof, respectively.
5. A method for producing a hollow rubber mold-based molding die according to any one of claims 1 to 4, comprising the steps of:
cutting the set rubber into rubber sheets (4) according to the size of the prepared hollow rubber die;
after an outer side isolation film (5) and an inner side isolation film (6) are respectively adhered to two sides of the rubber sheet (4), the rubber sheet (4) is laid and preshaped in the mold body (1), a first breathable material (801) and a first vacuum film (701) are sequentially laid in the inner side isolation film (6), and a support body (12) is placed;
the bearing plate (2) is screwed down by a connecting piece (3) and fixed at the corresponding position of the die body (1);
laying a second air-permeable material (802) and a second vacuum film (702), and sealing to form a vacuum system.
6. The method for preparing the hollow rubber mold according to claim 5, wherein the steps of laying and presetting the rubber sheet (4) in the mold body (1) after respectively attaching the outer side isolation film (5) and the inner side isolation film (6) to the two sides of the rubber sheet (4), sequentially laying the first air-permeable material (801) and the first vacuum film (701) in the inner side isolation film (6), and placing the support body (12) specifically comprise:
when the forming die is a single rubber die forming die, two side edges of the first vacuum film (701) are bonded;
sequentially overlapping, paving and positioning the breathable material (8) and the inner side isolating film (6) which are positioned at the upper part of the cavity of the die body (1);
and after the rubber sheet (4) is lapped on the upper part of the cavity, lapping, paving and positioning the outer side isolation film (5) positioned on the upper part of the cavity of the die body (1).
7. The method for preparing the hollow rubber mold according to claim 5, wherein after the outer side isolation film (5) and the inner side isolation film (6) are respectively attached to two sides of the rubber sheet (4), the rubber sheet (4) is laid and pre-shaped in the mold body (1), the first air-permeable material (801) and the first vacuum film (701) are sequentially laid in the inner side isolation film (6), and the step of placing the support body (12) specifically comprises the following steps:
when the forming mold is a multi-rubber mold forming mold, two ends of the first vacuum film (701) are bonded to the bottom surface and the side surface of the two ends of the cavity of the mold body (1);
bonding two side edges of the first vacuum film (701) positioned at the upper part of the cavity, and sequentially overlapping, paving and positioning the first breathable material (801) positioned at the upper part of the cavity and the inner side isolation material (6);
and overlapping the rubber sheet (4) at the upper part of the cavity, and overlapping, paving and positioning the outer side isolation material (5).
8. The method for preparing the hollow rubber mold according to claim 5, wherein the first vacuum film (701) and the second vacuum film (702) are bonded to two ends of the cavity of the mold body (1) to form a vacuum system in a sealed manner, and specifically comprises:
when the forming mold is a single rubber mold forming mold, the forming mold which covers 1 to a plurality of single rubber molds completely lays a second air-permeable material (802) and a second vacuum film (702), the first vacuum film (701) and the second vacuum film (702) are bonded at two ends, and two side edges of the second vacuum film (702) are bonded and sealed to form a vacuum system.
9. The method for preparing a hollow rubber mold according to claim 5, wherein the first vacuum film (701) and the second vacuum film (702) are bonded to two ends of the cavity of the mold body (1) to form a vacuum system in a sealed manner, and the method further comprises:
when the forming mold is a multi-rubber mold forming mold, the second air-permeable material (802) and the second vacuum film (702) are laid, the second vacuum film (702) is bonded with the mold body (1) on two sides of the mold body (1), and the second vacuum film (702), the first vacuum film (701) and the mold body (1) are sealed at two ends of the mold bodies (1) at two ends to form a vacuum system.
CN202011139969.9A 2020-10-22 2020-10-22 Forming die of hollow rubber die and preparation method thereof Pending CN112454761A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63251207A (en) * 1987-04-07 1988-10-18 Ashida Seisakusho:Kk Molding method and apparatus for printed-circuit board
JPH08183039A (en) * 1994-12-14 1996-07-16 Renshun Shu Method of producing polyvinyl chloride emulsion ornament using reproduction mold
CN105034403A (en) * 2015-06-25 2015-11-11 北京卫星制造厂 Method for manufacturing composite shell
CN105599318A (en) * 2015-12-17 2016-05-25 航天海鹰(镇江)特种材料有限公司 Method for using open-type rubber soft die for realization of thin-wall I-beam structure composite material part
CN106182825A (en) * 2016-07-13 2016-12-07 航天海鹰(镇江)特种材料有限公司 The localization method of soft frock in a kind of composite product forming process
CN109353026A (en) * 2018-09-25 2019-02-19 成都飞机工业(集团)有限责任公司 It is a kind of to manufacture the mold and method for emitting shape Composite Material Stiffened Panel
CN109822943A (en) * 2019-03-05 2019-05-31 江苏恒神股份有限公司 A kind of forming method of composite material mould closing mould
CN111421715A (en) * 2020-03-30 2020-07-17 成都飞机工业(集团)有限责任公司 Mold for sewing RFI liquid molding cap-shaped ribs and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63251207A (en) * 1987-04-07 1988-10-18 Ashida Seisakusho:Kk Molding method and apparatus for printed-circuit board
JPH08183039A (en) * 1994-12-14 1996-07-16 Renshun Shu Method of producing polyvinyl chloride emulsion ornament using reproduction mold
CN105034403A (en) * 2015-06-25 2015-11-11 北京卫星制造厂 Method for manufacturing composite shell
CN105599318A (en) * 2015-12-17 2016-05-25 航天海鹰(镇江)特种材料有限公司 Method for using open-type rubber soft die for realization of thin-wall I-beam structure composite material part
CN106182825A (en) * 2016-07-13 2016-12-07 航天海鹰(镇江)特种材料有限公司 The localization method of soft frock in a kind of composite product forming process
CN109353026A (en) * 2018-09-25 2019-02-19 成都飞机工业(集团)有限责任公司 It is a kind of to manufacture the mold and method for emitting shape Composite Material Stiffened Panel
CN109822943A (en) * 2019-03-05 2019-05-31 江苏恒神股份有限公司 A kind of forming method of composite material mould closing mould
CN111421715A (en) * 2020-03-30 2020-07-17 成都飞机工业(集团)有限责任公司 Mold for sewing RFI liquid molding cap-shaped ribs and preparation method thereof

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