CN209738315U - A Modular Design Composite Mold - Google Patents

Abstract

The utility model belongs to the technical field of composite material building and molding, in particular to a composite material mold of modular design suitable for the production of container structures such as automobile battery boxes, bathtubs, and armored vehicle square boxes. The composite material mold includes a main body part for molding , used to fix the connector part of the main body part; the main part is made of light material and several panel units are spliced together, and each panel unit is connected and fixed through the connector part. The main structure of the embodiment of the present disclosure adopts the honeycomb sandwich structure composite material as the panel mold, which reduces the difference in thermal expansion coefficient between the mold and the composite material to be formed, and reduces the risk of curing deformation. The self-rigidity of the honeycomb structure ensures the overall rigidity of the mold, and its large thickness and low density provide convenience for assembly. The overall density is very light, which is convenient for the operator to carry and bag. The production process is simple, the cost of raw materials is low, and it is easy to popularize.

Description

A Modular Design Composite Mold

technical field

The utility model belongs to the technical field of composite material construction and molding, and in particular relates to a composite material mold with a modular design suitable for the production of container structures such as aircraft fuel tanks, automobile battery boxes, bathtubs, and armored vehicle square boxes. Background technique

Background technique

With the further reduction in cost and performance improvement of composite materials such as carbon fiber and glass fiber, they are being more and more widely used in aerospace, automobile, wind power, rail transit and other industries. In these industries, the structure of the square box is a common structure, and they are usually used in automobile battery boxes, armored vehicle square boxes, etc. Since this kind of square box container is generally composed of at least 5 sides, in order to improve the integrity of the structure to maintain the continuity of the fiber to the maximum, so as to ensure the load transmission at the corner, maximize the axial performance of the fiber, and reduce the assembly links and Therefore, it is advisable to adopt the overall layup and cure for this structure.

However, the overall curing needs to solve the problems of convenient layer laying and easy demoulding after curing. At the same time, in order to ensure that the composite material can be packaged and packaged more conveniently, the mold should not be too heavy. In some occasions, in order to ensure the temperature resistance of the composite material, it needs to be cured in a high temperature environment, which requires a certain temperature resistance of the mold. Considering the above factors, a comparative analysis of the existing material systems is shown in the table below

When using the above traditional materials as molds, two demoulding methods can be considered. One method is to directly mill out the designed mold size from the green body. This method is costly and wastes materials seriously, and a certain draft angle needs to be designed. Angle, generally 0.5°-3°, it is difficult to mill the corners into sharp corners during machining, and the R angle must be retained; another way is to use the structure during assembly, which requires the material to have a thickness (at least 3mm) , to ensure its own bending performance, if the substitute wood is used, it can meet the characteristics of light weight, low cost and easy assembly, but the temperature resistance of the substitute wood is poor, generally only 80°C, so it is difficult to form a high temperature resistant compound Material. If aluminum is used, the weight is lighter, but the cost is higher. If steel is adopted, the weight is very large, and as a mold, it is difficult to carry and make a vacuum bag troublesome problem for the operator.

Contents of the invention

Embodiments of the present disclosure provide a modularly designed composite mold and method of use thereof that address the above and other potential problems of the prior art.

According to an embodiment of the present disclosure: a composite material mold of modular design, the composite material mold includes a main body part for forming, and a connector part for fixedly connecting the main body part;

Wherein, the main body part is spliced by several panel units made of lightweight materials, and each panel unit is connected and fixed through the connecting piece part.

Further, the panel unit includes a bottom panel for forming the bottom surface of the mold and a side panel for forming the frame;

Several side panels are sequentially connected end to end to form the outer frame of the main body; the bottom panel is arranged on one end surface of the outer frame.

Further, the connecting piece part includes a connecting block, a connecting angle piece and a bolt, and the connecting block is respectively arranged inside the connection between the panel and several of the side panels. Further, the panel unit adopts a honeycomb sandwich structure, including an upper panel, an upper adhesive film, a lower panel, a lower adhesive film and a honeycomb structure;

Wherein, the upper glued film and the lower glued film are arranged on the upper end surface and the lower end surface of the honeycomb structure respectively, the upper panel is arranged on the upper end surface of the upper glued film, and the lower panel is arranged on the lower glued surface. the lower end of the membrane.

Further, the panel unit also includes a long-angle piece for preventing the honeycomb structure from collapsing, and the long-angle piece is bonded to the surrounding sides of the honeycomb structure. Further, the upper panel and the lower panel are made of carbon fiber with a surface roughness greater than 0.5.

Further, the honeycomb structure is aramid paper honeycomb, aluminum honeycomb, PMI or PVC.

The beneficial effect of the embodiment of the present disclosure is: the main structure of the embodiment of the present disclosure adopts the honeycomb sandwich structure composite material as the panel mold, which reduces the difference in thermal expansion coefficient between the mold and the composite material to be formed, and reduces the curing deformation risks of. The self-rigidity of the honeycomb sandwich structure ensures the overall rigidity of the mold, and thus its large thickness and low density provide convenience for assembly. When this mold is demolded, it is only necessary to unscrew the bolts and remove the connecting angle pieces, which is convenient for demoulding. The mold itself has a good surface quality and no additional surface treatment is necessary. The overall density of this mold is very light, which is convenient for the operator to carry and bag. The manufacturing process of the mold is simple, the cost of raw materials is low, and it is easy to popularize.

Description of drawings

Fig. 1 is a schematic axonometric view of a composite material mold of a modular design according to an embodiment of the present disclosure.

FIG. 2 is a schematic top view of a composite material mold of a modular design according to an embodiment of the present disclosure.

Fig. 3 is a structural diagram of a sandwich structure panel of a modular design composite material mold according to an embodiment of the present disclosure.

Fig. 4 is a left side view of a sandwich structure panel of a modular design composite material mold according to an embodiment of the present disclosure.

In the picture:

1. Main part, 1-1. Bottom panel, 1-2. Bottom panel, 2. Connector part, 2-1. Connecting angle piece, 2-2. Bolt, 2-3. Connecting block, 3. Long angle 4. Upper panel; 5. Lower adhesive film, 6. Lower adhesive film, 7. Honeycomb structure, 8. Lower panel.

Detailed ways

The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-4, an embodiment of the present disclosure is a composite material mold with a modular design, the composite material mold includes a main body part for molding, and a connector part for fixedly connecting the main body part;

The connector part is made of light materials and several panel units are spliced together, and the panel units are connected and fixed through the connector part. The panel unit includes a bottom panel for molding the bottom surface of the mold and a side panel for frame molding;

Several side panels are sequentially connected end to end to form the outer frame of the main body; the bottom panel is arranged on one end surface of the outer frame. The connecting piece part includes a connecting block, a connecting angle piece and a bolt, and the connecting block is respectively arranged inside the connection between the panel and several of the side panels. The panel unit adopts a honeycomb sandwich structure, including an upper panel, an upper glued film, a lower panel, a lower glued film and a honeycomb structure;

Wherein, the upper glued film and the lower glued film are arranged on the upper end surface and the lower end surface of the honeycomb structure respectively, the upper panel is arranged on the upper end surface of the upper glued film, and the lower panel is arranged on the lower glued surface. the lower end of the membrane.

The panel unit also includes long-angle pieces for preventing the honeycomb structure from collapsing, and the long-angle pieces are bonded to the surrounding sides of the honeycomb structure. The upper panel and the lower panel are made of carbon fiber with a surface roughness greater than 0.5. The honeycomb structure is aramid paper honeycomb, aluminum honeycomb, PMI or PVC. The method for preparing a composite material box body using the above-mentioned composite material mold specifically includes the following steps: Step 1: design and prepare a mold assembly according to the required composite material box body, and prepare it for standby; Step 2: use the connecting angle pieces and bolts to The bottom panel and several side panels are connected together, and finally the box mold is obtained; Step 3: Lay the composite material according to the lay-up design; Step 4: After the lay-up is completed, vacuum bag the entire box body, vacuum The bag completely surrounds the box body; when bagging, pay attention to put more air felt at the connecting corners to prevent the aluminum connecting corners from piercing the vacuum bag;

Step 5: Put it in a curing furnace oven or autoclave for curing; Step 6: After curing, disassemble the vacuum bag and remove the bolts on the connecting corner piece; Step 7: Remove the connecting corner piece, first put the side panel to Pull it out, and finally remove the bottom panel;

Step 8: Obtain the designed composite box body.

The specific process of preparing the mold assembly in the step 1 is as follows: Step 1.1: Making the panel: selecting a suitable material to make a plain or twill prepreg, adopting a symmetrical layering method, and adopting hot-press curing or vacuum bag curing as the curing method; the upper and lower panels of the sandwich structure;

Step 1.2: Select a honeycomb material with a thickness of 20-50mm, and set areas on the honeycomb as the bottom panel and side panel, and set the position for filling the connection block at the edge of each area, and fill the connection block into the corresponding position to obtain the honeycomb structure;

Step 1.3: First put down the panel on the flat mold, lay the upper and lower adhesive films, then put the honeycomb structure prepared in step 2, then put the upper adhesive film, and finally put the panel, and bond the upper panel, the lower panel and the honeycomb structure ;

Step 1.4: After bonding, use high-pressure water cutting to cut out the bottom panel and side panels of the sandwich structure respectively. Said step: 1.2 also includes the following steps: in order to prevent the side of the honeycomb structure from collapsing under external pressure when solidified, a long angle plate with a comparable size is bonded on the side of each honeycomb. Embodiment: Specific implementation methods Take a square box of 400mm×400mm×180mm as an example to illustrate its production and later use process.

1. Mold making

1. Make 2 carbon fiber panels of 500mm*1000mm. The material can be plain weave 300 prepreg, and the layering method is [45/0/90/0/45]s. The curing method adopts hot pressing curing or vacuum bag curing. The upper and lower panels of the sandwich structure are obtained.

2. Take out a 500mm*1000mm aramid paper honeycomb piece with a thickness of 35mm. On the aramid paper honeycomb, draw the area that will be used to divide a bottom panel 1-1 and four side panels 1-2, namely the first side panel, the second side panel, the third side panel and the fourth side panel . And mark each area where it will be filled with aluminum connection blocks.

3. According to the drawn position, dig out the aramid paper honeycomb into a 30mm×30mm square. First put down the panel 8 on the flat mold, spread a layer of lower adhesive film 5, then put the aramid paper honeycomb structure 7 that has been dug out, then put a layer of upper adhesive film 6, and finally put the panel 4. The upper panel 4 and the lower panel 8 are bonded to the aramid paper honeycomb structure 7 .

4. After bonding, use high-pressure water cutting to cut out 5 parts of the sandwich structure, which are one bottom plate and four side plates 1-1.

5. First, punch holes on both sides of the connecting corner piece 2-1. Then the connecting corner piece 2-1 is matched with the aluminum connection block 2-3 places of the bottom panel 1-1 and the four side panels 1-2 and punched. Tap after drilling.

6. Connect one bottom panel 1-1 and four side panels 1-2 by using the bolts 2-2 connecting the corner piece 2-1 and the M8 inner hexagon, and finally obtain the box mold.

7. In order to prevent the side of the honeycomb from collapsing due to external pressure during solidification, a long angle plate made of carbon fiber board or glass fiber board of equivalent size is bonded on the side of each honeycomb.

2. The use of the mold 1. Lay the composite material according to the lay-up design.

2. After the lamination is completed, vacuum bag the entire box body, and the vacuum bag will completely surround the box body. When bagging, pay attention to put more air felt at the connecting corners to prevent the aluminum connecting corners from piercing the vacuum bag.

3. Put it in a curing oven or autoclave for curing. 4. After curing, disassemble the vacuum bag and remove the screws 2-2 on the connecting angle piece. 5. Remove the connecting angle piece 2-1, first pull out the four side panels 1-22, and finally remove the Bottom panels 1-1. 6, get the designed composite box parts.

The embodiments of the present utility model have been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (9)

1. A composite material mold of modular design, characterized in that, the composite material mold includes a main body part for molding, and a connector part for fixedly connecting the main body part; Wherein, the main body part is spliced by several panel units made of light materials, and each panel unit is connected and fixed through the connecting piece part. 2. The composite material mold according to claim 1, wherein the panel unit comprises a bottom panel for mold bottom molding and a side panel for frame molding; Several side panels are sequentially connected end to end to form the outer frame of the main body; the bottom panel is arranged on one end surface of the outer frame. 3. The composite material mold according to claim 2, wherein the connector part comprises a connecting block, a connecting angle piece and a bolt, and a plurality of the connecting blocks are arranged on the panels and some of the sides respectively. The inside of the junction of the panels. 4. The composite material mold according to claim 1, wherein the panel unit adopts a honeycomb sandwich structure, including an upper panel, an upper adhesive film, a lower panel, an lower adhesive film and a honeycomb structure; Wherein, the upper glued film and the lower glued film are arranged on the upper end surface and the lower end surface of the honeycomb structure respectively, the upper panel is arranged on the upper end surface of the upper glued film, and the lower panel is arranged on the lower glued surface. the lower end of the membrane. 5. The composite material mold according to claim 4, characterized in that, the panel unit also includes a long angle sheet for preventing the honeycomb structure from collapsing, and the long angle sheet is bonded around the honeycomb structure on the side. 6. The composite material mold according to claim 4, characterized in that, the upper panel and the lower panel are made of carbon fibers with a surface roughness greater than 0.5. 7. The composite mold according to claim 4, wherein the honeycomb structure is aramid paper honeycomb, aluminum honeycomb, PMI or PVC. 8. The composite material mold according to claim 4, characterized in that, the panel unit also includes a long angle plate used to prevent the side of the honeycomb structure from being subjected to external pressure and collapse when solidified, and the long angle plate is arranged on on the sides of the bottom panel and side panels. 9. The composite material mold according to claim 8, characterized in that, the long angle plate is made of carbon fiber plate or glass fiber plate.