Die for RTM (Resin Transfer Molding) forming of large-size barrel

Abstract

The utility model provides a mould for RTM (resin transfer molding) forming of a large-size barrel, which comprises a base, the base is positioned below the mould, a core mould is clamped in the middle of the base, and a left forming mould body and a right forming mould body are respectively connected to two sides of the base in a sliding manner; a cover plate is fixedly arranged above the left side forming die body, the right side forming die body and the core die, limiting blocks are fixedly arranged in the middles of the two parallel sides of the upper end face of the base, and sliding blocks are arranged at the two ends of the upper end face of the base. The lower end face of the left side forming die body and the lower end face of the right side forming die body are each provided with a sliding groove in sliding fit with the corresponding sliding block. Through the cooperation of the sliding assembly and the guide assembly, the left forming die body and the right forming die body can be conveniently closed and opened, the structure is simple, the weight is light, and RTM forming of a large-size barrel can be met.

Description

Technical Field

[0001] This utility model relates to the field of RTM molding technology, and in particular to a mold for RTM molding of large-size cylindrical bodies. Background Technology

[0002] Currently, for the production of composite material parts with complex shapes and high surface quality requirements, resin transfer molding (RTM) is generally used. This is a low-cost liquid molding technology that does not use prepreg. The production process of the part is completed through five steps: preformed blank, mold closing, resin injection, curing, and demolding. Due to its advantages such as high production efficiency, high manufacturing precision, good surface quality, and the ability to directly mold complex shapes, RTM is being used more and more widely in aerospace, rail transportation, and other fields.

[0003] However, current traditional RTM molding dies for cylindrical annular closed structures are mostly small-sized cylindrical molding dies with a diameter of less than 500mm, which suffer from drawbacks such as complex structure, large weight, and difficulty in demolding. Therefore, there is an urgent need to develop a large-sized cylindrical RTM molding die that is simple in structure, lightweight, easy to demold, and inexpensive.

[0004] In view of this, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this invention is to provide a mold for RTM molding of large-size cylindrical bodies, which solves the problems of existing molding molds being unsuitable for large-size cylindrical bodies, having complex structures, large weight, and being difficult to demold.

[0006] The present invention relates to a mold for large-size cylindrical RTM molding, comprising: a base located below the mold, a core mold being snapped into the middle of the base, a left molding mold body and a right molding mold body being slidably connected to the two sides respectively, and a cover plate being fixedly provided above the left molding mold body, the right molding mold body and the core mold.

[0007] Furthermore, limit blocks are fixedly installed at the middle of the two parallel sides on the upper surface of the base, and sliders are provided at both ends. Correspondingly, sliding grooves that cooperate with the sliders are provided on the lower surface of the left and right molding bodies.

[0008] Furthermore, a first slot is provided in the middle of the upper end face of the base, the bottom surface of the core mold is engaged in the first slot, a first annular groove is provided along the edge of the first slot, and a first O-ring sealing strip is placed in the first annular groove.

[0009] Furthermore, a second slot is provided in the middle of the lower end face of the cover plate, the upper end face of the core mold is engaged in the second slot, a second annular groove is provided along the edge of the second slot, and a second O-ring sealing strip is placed in the second annular groove.

[0010] Furthermore, a first groove and a second groove are respectively provided on the inner sides of the left and right molding molds, and a third O-ring sealing strip is placed in the first or second groove.

[0011] Furthermore, multiple injection valves are evenly distributed on the lower surface of the base along the circumference of the core mold, and multiple dispensing valves are evenly distributed on the upper surface of the cover plate along the circumference of the core mold.

[0012] Furthermore, a left push-pull handle and a right push-pull handle are respectively provided on the outer side of the left molding mold body and the right molding mold body away from the core mold, and multiple weight reduction grooves are correspondingly opened on the outer side of the left molding mold body and the right molding mold body.

[0013] Furthermore, the core mold is barrel-shaped with a beveled upper surface that is flush with the upper surface of the composite material blank, and the outer diameter of the core mold is the same as the inner diameter of the composite material blank.

[0014] Furthermore, a support leg is provided on the lower end face of the base, and the lower end of the support leg is a fixed end, which is fixed to the horizontal platform.

[0015] Furthermore, limit plates are provided on both the front and rear end faces of the base.

[0016] Furthermore, multiple first positioning pin holes and second positioning pin holes are respectively provided on the sides of the left and right molding molds. The first positioning pins pass through the first positioning pin holes and the second positioning pin holes in sequence to fix the left and right molding molds together.

[0017] Furthermore, a plurality of third positioning pin holes are provided on the upper end face of the left molding body, and correspondingly, a plurality of fourth positioning pin holes are provided on the cover plate. The second positioning pin passes through the third positioning pin holes and the fourth positioning pin holes in sequence to fix the left molding body and the cover plate in place.

[0018] Furthermore, a plurality of fifth positioning pin holes are provided on the upper end face of the right molding body, and correspondingly, a plurality of sixth positioning pin holes are provided on the cover plate. The third positioning pin passes through the fifth positioning pin holes and the sixth positioning pin holes in sequence to fix the right molding body and the cover plate together.

[0019] Furthermore, lifting eye holes are provided at the center of the upper end face of the left molding mold, the right molding mold, the base, and the cover plate.

[0020] This invention has the following advantages over the prior art:

[0021] 1. This utility model provides a slider on the base and corresponding slide grooves on the left and right molding molds, allowing the left and right molding molds to be fixed to the base by sliding. A limit block is fixed in the slide groove in the middle of the base to limit the rightward displacement of the left molding mold and the leftward displacement of the right molding mold. Limiting plates on the front and rear sides of the base limit the front-rear displacement of the left and right molding molds, facilitating the opening and closing of the left and right molding molds.

[0022] 2. In order to ensure that the RTM injection molding process is not corroded by solvents and to ensure the molding accuracy of the aerogel felt, the mold material of this utility model is stainless steel, and the mold forming method is casting and machining.

[0023] 3. The outer diameter of the core mold of this utility model is the same as the inner diameter of the composite material part, so it can quickly complete the preparation of large-size, one-piece cylindrical closed RTM molding products, improve product molding efficiency, and ensure the quality of the molded products.

[0024] 4. The left and right molding molds of this utility model are also provided with multiple weight-reducing grooves, which makes the overall weight of the mold light and easy to install and use. Attached Figure Description

[0025] Figure 1 This is an exploded structural diagram of the RTM forming mold for large-size cylindrical bodies according to this utility model.

[0026] Figure 2 This is a rear view structural diagram of the RTM forming mold for large-size cylindrical bodies according to this utility model;

[0027] Figure 3 This is a side view of the RTM forming mold for large-size cylindrical bodies according to the present invention.

[0028] Figure 4 This is a cross-sectional structural schematic diagram of the RTM forming mold for large-size cylindrical bodies according to this utility model;

[0029] Figure 5 This is a front view structural diagram of the RTM forming mold for large-size cylindrical bodies according to this utility model;

[0030] Figure 6This is a bottom view structural diagram of the RTM forming mold for large-size cylindrical bodies according to this utility model;

[0031] Figure 7 This is a schematic diagram of the demolding base of the present invention used for large-size cylindrical RTM injection molding.

[0032] Among them, 1-left side molding body; 101-left push-pull handle; 2-right side molding body; 201-right push-pull handle; 3-base; 301-support leg; 302-limiting block; 304-slider; 305-limiting plate; 306-injection valve; 4-cover plate; 401-second O-ring sealing strip; 402-discharge valve; 5-core mold; 6-cavity; 7-demolding base; 702-demolding ejector pin; 703-demolding ring. Detailed Implementation

[0033] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention.

[0034] According to an embodiment of the present invention, a mold for large-size cylindrical RTM molding is provided, referencing... Figure 1-6 As shown, the mold comprises: a left molding mold 1, a right molding mold 2, a base 3, a cover plate 4, and a core mold 5. The base 3 is located below the mold, and the core mold 5 is engaged in the center of the base 3. The left molding mold 1 and the right molding mold 2 are slidably connected to each other on both sides, and the core mold 5 is located in the space between the left molding mold 1 and the right molding mold 2. The space between the left molding mold 1, the right molding mold 2, and the core mold 5 is a cavity 6. The cover plate 4 is fixedly installed above the left molding mold 1, the right molding mold 2, and the core mold 5.

[0035] According to an embodiment of this utility model, limiting blocks 302 are fixedly provided at the middle positions of the front and rear sides on the upper end surface of the base 3. Slider blocks 304 are provided at the left and right ends of the front and rear sides of the upper end surface, and the limiting blocks 302 and sliders 304 form a sliding assembly. Correspondingly, sliding grooves that cooperate with the sliders 304 are provided on the lower end surfaces of the left molding mold 1 and the right molding mold 2, and the multiple sliding grooves form a guide assembly. The multiple sliders 304 correspond one-to-one with the multiple sliding grooves. The lower end face of any one of the multiple sliders 304 is fixedly connected to the upper end face of the base 3, and the upper end face of the slider 304 is located in the corresponding sliding groove. There are two limiting blocks 302; any one of the limiting blocks 302 can be engaged at the connection point of the left and right sliding grooves and fixed within the sliding groove. The slider 304 can contact the limiting block 302 during movement, thereby limiting the movement of the slider 304 in the left and right directions. That is, the guide component cooperates with the sliding component to move the left molding mold 1 and the right molding mold 2 toward or away from the core mold 5.

[0036] According to an embodiment of this utility model, a first slot is provided in the middle of the upper end face of the base 3, and the bottom surface of the core mold 5 is engaged in the first slot. A first annular groove is formed along the edge of the first slot, and a first O-ring sealing strip is placed in the first annular groove. A second slot is provided in the middle of the lower end face of the cover plate 4, and the upper end face of the core mold 5 is engaged in the second slot. A second annular groove is formed along the edge of the second slot, and a second O-ring sealing strip 401 is placed in the second annular groove. A first groove and a second groove are correspondingly formed on the inner surfaces of the left molding mold 1 and the right molding mold 2, and a third O-ring sealing strip is placed in the first groove or the second groove. The third O-ring sealing strip is semi-circular. When the left molding mold 1 and the right molding mold 2 are closed, the two ends of the third O-ring sealing strip can be engaged in another groove, thus achieving the same sealing effect between the molding mold and the core mold 5.

[0037] According to an embodiment of the present invention, a plurality of glue injection valves 306 are evenly distributed on the lower bottom surface of the base 3 along the circumferential direction of the core mold 5, and a plurality of glue dispensing valves 402 are evenly distributed on the upper surface of the cover plate 4 along the circumferential direction of the core mold 5. The specific number is set according to actual needs.

[0038] According to an embodiment of the present invention, a left push-pull handle 101 and a right push-pull handle 201 are respectively provided on the outer surfaces of the left molding mold 1 and the right molding mold 2 away from the core mold 5. Furthermore, multiple weight-reducing grooves are correspondingly provided on the outer surfaces of the left molding mold 1 and the right molding mold 2.

[0039] According to an embodiment of the present invention, the core mold 5 is barrel-shaped, with its upper end face being a beveled surface. The beveled surface is flush with the upper end face of the composite material blank, and the outer diameter of the core mold 5 is the same as the inner diameter of the composite material blank.

[0040] According to an embodiment of this utility model, a support leg 301 is provided on the lower end surface of the base 3. The lower end of the support leg 301 is a fixed end, fixed to a horizontal platform. Generally, support legs 301 are provided on all four corners of the base 3, but their installation position and number can be adjusted according to actual conditions. The support leg 301 is used to support the base 3.

[0041] According to an embodiment of this utility model, limiting plates 305 are provided on both the front and rear ends of the base 3. The limiting plates 305 can be fixed to the front and rear sides of the base 3 by bolts and nuts, specifically located at the four corresponding corners of the front and rear sides of the base 3. This allows the left side of the base 3 and the left side of the left molding mold 1 to be fixed on the same plane, and the right side of the base 3 and the right side of the right molding mold 2 to be fixed on the same plane. The limiting plates 305 are used to limit the forward and backward movement of the left molding mold 1 and the right molding mold 2.

[0042] According to an embodiment of this utility model, multiple first positioning pin holes and second positioning pin holes are respectively provided on the sides of the left molding mold 1 and the right molding mold 2. First positioning pins pass through the first and second positioning pin holes sequentially to fix the left molding mold 1 and the right molding mold 2 together. Multiple third positioning pin holes are provided on the upper surface of the left molding mold 1. Correspondingly, multiple fourth positioning pin holes are provided on the cover plate 4. Second positioning pins pass through the third and fourth positioning pin holes sequentially to fix the left molding mold 1 and the cover plate 4 together. Multiple fifth positioning pin holes are provided on the upper surface of the right molding mold 2. Correspondingly, multiple sixth positioning pin holes are provided on the cover plate 4. Third positioning pins pass through the fifth and sixth positioning pin holes sequentially to fix the right molding mold 2 and the cover plate 4 together.

[0043] According to an embodiment of this utility model, lifting eye holes are provided at the center of the upper end face of the left molding mold 1, the right molding mold 2, the base 3, and the cover plate 4 to facilitate lifting and installation.

[0044] The specific installation steps for the mold used in large-size cylindrical RTM molding of this utility model are as follows:

[0045] Step 1: Preparation for installing base 3.

[0046] Install the support leg 301, slider 304, limit block 302, first O-ring sealing strip, limit plate 305 and glue injection valve 306 on the base 3 in sequence.

[0047] Step 2: Preparation for the installation of the left molding mold 1 and the right molding mold 2.

[0048] A third O-ring sealing strip is installed in the second groove on the side of the right molding body 2 near the core mold 5, and a right push-pull handle 201 is installed on the side of the right molding body 2 away from the core mold 5, and a left push-pull handle 101 is installed on the side of the left molding body 1 away from the core mold 5.

[0049] Step 3: Place the base 3 prepared in step 1 on a horizontal platform and fix it in place.

[0050] Step 4: Snap the bottom surface of the core mold 5 into the first slot on the base 3, and when snapping it in, make sure that the bottom surface of the core mold 5 is tightly attached to the first O-ring sealing strip in the first slot to ensure the airtightness of the core mold 5 installation.

[0051] Step 5: Hoist the right molding mold 2 prepared in Step 2 to the top of the base 3 through the lifting eye hole, and install the slider 304 on the upper surface of the base 3 into the slide groove of the right molding mold 2; push the right push-pull handle 201 to move the right molding mold 2 towards the core mold 5 until the right end of the limiting block 302 is engaged in the limiting groove at the left end of the slide groove of the right molding mold 2; then, use the limiting plate 305 to limit the forward and backward movement of the right molding mold 2, so that the right molding mold 2 is always aligned with the side of the base 3.

[0052] Step 6: Hoist the left molding mold 1 prepared in step 2 to the top of the base 3 through the lifting eye hole. The slider 304 on the upper surface of the base 3 is installed in the slide groove of the left molding mold 1. Push the left push-pull handle 101 to move the left molding mold 1 towards the core mold 5 until the left end of the limiting block 302 is engaged in the limiting groove at the right end of the slide groove of the left molding mold 1. Then, use the limiting plate 305 to limit the forward and backward movement of the left molding mold 1 so that the left molding mold 1 is always aligned with the side of the base 3.

[0053] Step 7: Connect the left molding mold 1 and the right molding mold 2 with the first positioning pin to close the mold; when closing the mold, the third O-ring sealing strip in the side groove of the left molding mold 1 and the right molding mold 2 must be tightly attached to ensure the airtightness after the mold is closed.

[0054] Step 8: Use the second positioning pin and the third positioning pin to position and fasten the cover plate 4 to the left molding mold 1 and the right molding mold 2 respectively. When fixing the cover plate 4, the second O-ring sealing strip 401 in the second slot on the bottom surface of the cover plate 4 must be tightly fitted to the end face of the core mold 5 to ensure the overall airtightness of the mold.

[0055] Specifically, when using this mold for large-size cylindrical RTM molding, the process is as follows: First, wrap the low-density aerogel felt to be injection molded onto the core mold 5, ensuring the inner surface of the aerogel felt is tightly attached to the outer surface of the core mold 5. Then, inject the adhesive into the mold through the injection valve 306. The aerogel felt can only be formed after the adhesive has cured. Finally, place the molded part onto the attached... Figure 7 On the demolding base shown, by rotating the demolding ejector rod 702, the aerogel felt on the outer surface of the core mold 5 is demolded through the demolding ring 703 to obtain the product blank.

[0056] This utility model is applicable to the RTM injection mold structure for large-size cylindrical products, and the actual product quality is good.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A mold for RTM molding of large size cylinders, characterized in that, The utility model relates to a kind of moulding machine, including: Base (3), the base (3) is located below mould, core mould (5) is clamped in the middle part of the base (3), left side forming die body (1) and right side forming die body (2) are slidably connected in two sides respectively, cover plate (4) is fixedly arranged above the left side forming die body (1), right side forming die body (2) and core mould (5).

2. The mold for RTM molding of large-size cylinders according to claim 1, characterized in that, Limiting block (302) is fixedly arranged in the middle part of both sides of the upper end surface of the base (3) mutually parallel, both ends are provided with sliding block (304), Correspondingly, sliding groove that is slidably matched with the sliding block (304) is provided on the lower end surface of the left side forming die body (1) and right side forming die body (2).

3. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, First clamping groove is provided in the middle part of the upper end surface of the base (3), the bottom surface of the core mould (5) is clamped in the first clamping groove, First annular groove is opened along the edge of the first clamping groove, and first O-shaped sealing rubber strip is placed in the first annular groove.

4. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, Second clamping groove is provided in the middle part of the lower end surface of the cover plate (4), the upper end surface of the core mould (5) is clamped in the second clamping groove, Second annular groove is opened along the edge of the second clamping groove, and second O-shaped sealing rubber strip (401) is placed in the second annular groove.

5. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, First groove and second groove are opened in the inner side surface of the left side forming die body (1) and right side forming die body (2) correspondingly, and third O-shaped sealing rubber strip is placed in the first groove or second groove.

6. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, Multiple glue injection valves (306) are uniformly distributed on the lower bottom surface of the base (3) along the circumferential direction of the core mould (5), and multiple glue outlet valves (402) are uniformly distributed on the upper surface of the cover plate (4) along the circumferential direction of the core mould (5).

7. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, Left pull handle (101) and right pull handle (201) are respectively arranged on the outer side surface of the left side forming die body (1) and right side forming die body (2) away from the core mould (5), And, multiple lightening grooves are opened in the outer side surface of the left side forming die body (1) and right side forming die body (2) correspondingly.

8. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, The core mould (5) is barrel-shaped, and the upper end surface is bevelled.

9. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, Support leg (301) is arranged on the lower end surface of the base (3), and the lower end of the support leg (301) is a fixed end and is fixed to a horizontal platform.

10. The mold for RTM molding of large size cylinders according to claim 1, characterized in that, Limiting plate (305) is arranged on the front and rear end surfaces of the base (3).

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