Multi-cavity pultrusion die
By designing multi-cavity pultrusion molds, they are divided into preformed sections, transition sections and curing sections, and setting up specific cavity and heating systems in each section, the problem of difficulty in accurately controlling temperature in traditional molds is solved, and efficient production and quality improvement of composite materials are achieved.
Patent Information
- Application Number
- CN202421048136.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-14
AI Technical Summary
Traditional integrated pultrusion molds are difficult to accurately control the temperature, resulting in inconsistent quality control of composite materials.
Design a multi-cavity pultrusion die, including preformed sections, transition sections and curing sections, each with a specific cavity and heating system, enabling more efficient production by isolating different process stages and precisely controlling the temperature.
Through the design of multi-cavity molds, temperature and process conditions can be controlled more accurately, and the quality and production efficiency of composite materials can be improved.
Smart Images
Figure CN222681847U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pultrusion molding process, and in particular to a multi-cavity pultrusion die. Background Art
[0002] The fabric pultrusion process is a process for continuously producing linear composite products. It uses resin as the matrix material and fiber and fabric as the reinforcing material. Under the traction of external force, it goes through preforming, impregnation, hot mold curing, and finally forms a continuous regular cross-section product.
[0003] The traditional pultrusion mold is an integrated mold. During the pultrusion process, different parts require different temperatures. At the beginning, the temperature needs to be gradually increased. At this time, the resin absorbs heat and begins to undergo a cross-linking reaction. The viscosity rises rapidly and produces viscous resistance. Then the temperature rises further, the resin reacts to a higher degree of curing, and combines with the reinforcement material to cure into a composite material. It is difficult to accurately control the temperature of the traditional integrated mold, and it is also difficult to achieve consistency in the quality control of pultruded products.
[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Utility Model Content
[0005] The utility model provides a multi-cavity pultrusion die, thereby effectively solving the problems in the background technology.
[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-cavity pultrusion die, including:
[0007] A preforming section, the preforming section comprising a preforming cavity, the preforming cavity being used to conform the fabric and compress its volume;
[0008] A transition section, wherein the flexible section includes a transition chamber, and the transition chamber is used to infuse the fabric with resin, and to heat and exhaust the fabric;
[0009] The curing section includes a curing chamber and a post-curing chamber. The curing chamber cures the resin to combine with the fabric to form a composite material. The post-curing chamber performs post-curing to eliminate internal stress.
[0010] There is a distance between the preforming section, the transition section and the curing section respectively, and the transition section and the curing section are respectively provided with a first heating system and a second heating system to heat the transition section and the curing section respectively.
[0011] Furthermore, the length of the preforming section is shorter than that of the transition section, and the length of the transition section is shorter than that of the curing section.
[0012] Furthermore, the first heating system includes two first heating plates, which are respectively arranged at two ends of the transition section in a vertical direction, and the two first heating plates are arranged at one end of the transition section close to the curing section.
[0013] Furthermore, the second heating system includes two groups of second heating plates, which are respectively arranged at corresponding positions of the curing chamber and the post-curing chamber. Each group of second heating plates consists of two plates, and the two second heating plates are arranged at both ends of the transition section in the vertical direction.
[0014] Furthermore, the preforming section, transition section and curing section respectively include an upper mold and a lower mold, and the preforming section, transition section and curing section are respectively provided with a plurality of pins at both ends of the side, and the plurality of pins are used to quickly fix the upper mold and the lower mold of the preforming section, transition section and curing section.
[0015] Furthermore, a plurality of pre-tightening screws are provided between the upper mold and the lower mold of the preforming section, the transition section and the curing section, and the pre-tightening screws pre-tighten the upper mold and the lower mold, and then fix them through the pin shaft.
[0016] Furthermore, a glue injection hole is provided on the transition section, and the glue injection hole is communicated with the transition cavity and is used for injecting resin into the transition cavity.
[0017] Furthermore, the transition section is provided with the glue injection holes at both ends in the vertical direction.
[0018] The beneficial effects of the present invention are as follows: a certain distance is set between the preforming section, transition section and curing section, which helps to isolate and control the processes at different stages, thereby improving production efficiency and product quality. In addition, by setting the first heating system and the second heating system to heat the transition section and the curing section respectively, the temperature can be controlled more accurately to ensure that the process conditions at each stage can be met. In general, this multi-cavity pultrusion die solution provides a new, more flexible and efficient process solution for the production of composite materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 It is a structural schematic diagram of the transition section;
[0022] Figure 3 It is a cross-sectional view of the transition section;
[0023] Figure 4 It is a side view of the curing section. DETAILED DESCRIPTION
[0024] The technical scheme in the practical embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the practical embodiment of the present invention. Obviously, the described embodiment is only a part of the practical embodiment of the present invention, rather than all the embodiments.
[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0026] In the description of this utility, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility can be understood according to specific circumstances.
[0027] like Figures 1 to 4 As shown: A multi-cavity pultrusion die, including:
[0028] Preforming section 1, the preforming section 1 includes a preforming cavity, and the preforming cavity is used to shape and compress the volume of the fabric;
[0029] Transition section 2, the flexible section includes a transition chamber, which is used to infuse the fabric with resin, and to heat and exhaust the fabric;
[0030] Curing section 3, which includes a curing chamber and a post-curing chamber. The curing chamber cures the resin to combine with the fabric to form a composite material, and the post-curing chamber performs post-curing to eliminate internal stress;
[0031] There is a distance between the preforming section 1, the transition section 2 and the curing section 3, respectively. The transition section 2 and the curing section 3 are respectively provided with a first heating system 21 and a second heating system 31 to heat the transition section 2 and the curing section 3, respectively.
[0032] The technical solution in this embodiment takes into account the requirements of different stages in the pultrusion process, and realizes the processes of fabric preforming, resin infusion and curing by setting up cavities with different functions in sections. Specifically, this system includes the following key components:
[0033] Preforming section 1: The preforming cavity is used to conform and compress the fabric, which helps to make the fabric easier to handle and form the desired structure in subsequent processing.
[0034] Transition Section 2: The transition chamber is used to infuse the fabric with resin, and is heated and vented, which helps ensure that the resin is fully penetrated and evenly distributed in the fabric, while exhausting any gas that may be present to reduce defects in the finished product.
[0035] Curing Section 3: The curing chamber cures the resin and combines it with the fabric to form a composite material, while the post-curing chamber performs post-curing, which helps to eliminate internal stress and improve the stability and performance of the finished product.
[0036] In this system, a certain distance is set between the preforming section 1, the transition section 2 and the curing section 3, which helps to isolate and control the processes at different stages, thereby improving production efficiency and product quality. In addition, by setting the first heating system 21 and the second heating system 31 to heat the transition section 2 and the curing section 3 respectively, the temperature can be controlled more accurately to ensure that the process conditions at each stage can be met. In general, this multi-cavity pultrusion die solution provides a new, more flexible and efficient process solution for the production of composite materials.
[0037] The length of the preforming section 1 is shorter than that of the transition section 2 , and the length of the transition section 2 is shorter than that of the curing section 3 .
[0038] The importance and process requirements of different stages in the pultrusion process are taken into account. By ensuring that the length of the preform section 1 is shorter than the transition section 2, and the length of the transition section 2 is shorter than the curing section 3, the entire pultrusion process can be more effectively controlled and optimized. The short length of the preform section 1 means that at this stage, the fabric is mainly treated initially, such as following and compressing the volume, without requiring too much time and resources. This ensures that the fabric remains in good condition when entering the subsequent transition section 2, providing a good foundation for subsequent process steps.
[0039] Transition section 2 is relatively long because key steps such as resin infusion, heating and exhaust are required at this stage to ensure that the resin can fully penetrate into the fabric and exclude possible bubbles. Therefore, by increasing the length of transition section 2, the permeability and uniformity of the resin can be improved, thereby improving the quality and performance of the final product.
[0040] As the last stage, curing section 3 is relatively long because the resin needs to be fully cured at this stage to ensure that the composite material can achieve the required strength and stability. In addition, the post-curing cavity also needs to be long enough to eliminate possible internal stress to ensure the stability and consistency of the final product.
[0041] Therefore, by optimizing the length ratio of the preforming section 1, the transition section 2 and the curing section 3, the entire pultrusion process can be better optimized and the quality and production efficiency of the product can be improved.
[0042] In this embodiment, the first heating system 21 includes two first heating plates 211 , which are respectively arranged at two ends of the transition section 2 in the vertical direction, and the two first heating plates 211 are arranged at one end of the transition section 2 close to the curing section 3 .
[0043] By arranging two first heating plates 211 at both ends of the transition section 2 in the vertical direction and placing them close to one end where the transition section 2 and the curing section 3 meet, uniform heating and temperature control of the transition section 2 can be achieved.
[0044] The two first heating plates 211 are arranged at both ends of the transition section 2 to ensure that the transition section 2 is evenly heated from both sides, which helps to avoid temperature gradients, thereby ensuring uniform curing of the resin and uniform infusion of the fabric. At the same time, the two heating plates are arranged at one end of the transition section 2 close to the curing section 3 to ensure that the resin has reached the required temperature and viscosity before the fabric enters the curing section 3, so as to form a stable composite material in the curing section 3.
[0045] This design not only helps to improve the quality and consistency of the product, but also optimizes production efficiency and energy utilization. By accurately controlling the temperature and position of the first heating system 21, it is possible to ensure uniform temperature distribution throughout the pultrusion process, thereby reducing production costs and improving production efficiency.
[0046] Among them, the second heating system 31 includes two groups of second heating plates 311, which are respectively arranged at corresponding positions of the curing chamber and the post-curing chamber. Each group of second heating plates 311 consists of two pieces, and the two second heating plates 311 are arranged at both ends of the transition section 2 in the vertical direction.
[0047] By respectively setting two groups of second heating plates 311 at corresponding positions of the curing chamber and the post-curing chamber, and dividing each group of second heating plates 311 into two blocks, each block being set at both ends of the transition section 2 in the vertical direction, precise heating and temperature control of the curing section 3 and the post-curing section 3 can be achieved.
[0048] Placing the two sets of second heating plates 311 at corresponding positions in the curing chamber and the post-curing chamber helps ensure that the resin can be fully cured and internal stress can be eliminated in the key processes of these two stages, thereby improving the strength and stability of the final product. At the same time, by dividing each set of second heating plates 311 into two pieces and arranging them at both ends of the transition section 2, uniform heating of the curing section 3 and the post-curing section 3 can be achieved, which helps avoid temperature gradients and ensures uniform curing of the resin and consistency of the composite material.
[0049] This design can not only improve the quality and performance of the product, but also optimize production efficiency and energy utilization. By accurately controlling the temperature and position of the second heating system 31, it can ensure that the curing of the resin and the elimination of internal stress in the curing section 3 and the post-curing section 3 are in the best state, thereby improving the quality and stability of the product.
[0050] As a preferred embodiment of the above-mentioned embodiment, the preforming section 1, the transition section 2 and the curing section 3 respectively include an upper mold and a lower mold, and the preforming section 1, the transition section 2 and the curing section 3 are respectively provided with a plurality of pins 4 at both ends of the side, and the plurality of pins 4 are used to quickly fix the upper mold and the lower mold of the preforming section 1, the transition section 2 and the curing section 3.
[0051] The preforming section 1, transition section 2 and curing section 3 each include an upper die and a lower die, and a plurality of pins 4 are arranged at both ends of the side. This design has good practicality and convenience. Through such an arrangement, the mold can be quickly fixed and disassembled, so that the mold can be easily replaced and maintained, and the flexibility and efficiency of the production line are improved. The preforming section 1, transition section 2 and curing section 3 each include an upper die and a lower die, which means that in the pultrusion process, each stage has a corresponding die to form the required shape and structure. Such a design can better control the size and shape of the product and improve the consistency and precision of the product.
[0052] A plurality of pins 4 are arranged at both ends of the side for fast fixing of the mold, so that the mold can be quickly fixed in position when the mold needs to be replaced or maintained, reducing the downtime of the production line and improving production efficiency. At the same time, this also provides convenience for operators, enabling them to more easily install and remove the mold.
[0053] In this embodiment, a plurality of pre-tightening screws 5 are provided between the upper mold and the lower mold of the preforming section 1 , the transition section 2 and the curing section 3 . The pre-tightening screws 5 pre-tighten the upper mold and the lower mold, and then fix them through the pin 4 .
[0054] By arranging pre-tightening screws 5 between the upper and lower molds of the preforming section 1, the transition section 2 and the curing section 3, and pre-tightening them first when fixing them, and then finally fixing them through the pin 4, the stability and sealing of the mold during the production process can be ensured.
[0055] The pre-tightening screw 5 pre-tightens the upper and lower molds, which ensures that the upper and lower parts of the mold maintain a certain pressure and tightness during the production process, thereby preventing looseness or instability during the pultrusion process. This is essential to ensure the consistency of product size and shape.
[0056] The stability and reliability of the mold can be further ensured by final fixation with the pin 4 after pre-tightening. The pin 4, as the final fixing device, can provide additional support and fixation, thereby preventing the mold from moving or loosening during the production process, ensuring the quality of the product and the stability of the production line.
[0057] In this embodiment, the transition section 2 is provided with a glue injection hole 22, which is connected to the transition cavity and is used to inject resin into the transition cavity. The transition section 2 is provided with glue injection holes 22 at both ends in the vertical direction.
[0058] By providing injection holes 22 on the transition section 2 and ensuring that these injection holes 22 are connected to the transition cavity, the resin in the transition cavity can be injected. At the same time, injection holes 22 are provided at both ends of the transition section 2 in the vertical direction, further ensuring the uniform distribution and injection effect of the resin in the transition section 2. Such a design helps to ensure that the resin can fully penetrate into the fabric, avoid the generation of bubbles or uneven resin distribution, thereby improving the quality and performance of the final product. By providing injection holes 22 at both ends of the transition section 2, it can be ensured that the resin enters the transition cavity evenly from two directions, thereby further improving the uniformity and efficiency of the injection.
[0059] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A multi-cavity pultrusion die, characterized in that: Including settings along the pultrusion direction: A preforming section, the preforming section comprising a preforming cavity, the preforming cavity being used to conform the fabric and compress its volume; A transition section, the transition section comprising a transition chamber, the transition chamber being used to infuse the fabric with resin, and to heat and exhaust the fabric; The curing section includes a curing chamber and a post-curing chamber. The curing chamber cures the resin to combine with the fabric to form a composite material. The post-curing chamber performs post-curing to eliminate internal stress. There is a distance between the preforming section, the transition section and the curing section respectively, and the transition section and the curing section are respectively provided with a first heating system and a second heating system to heat the transition section and the curing section respectively.
2. The multi-cavity pultrusion die according to claim 1, characterized in that: The length of the preforming section is shorter than that of the transition section, and the length of the transition section is shorter than that of the curing section.
3. The multi-cavity pultrusion die according to claim 1, characterized in that: The first heating system includes two first heating plates, which are respectively arranged at two ends of the transition section in a vertical direction, and the two first heating plates are arranged at one end of the transition section close to the curing section.
4. The multi-cavity pultrusion die according to claim 1, characterized in that: The second heating system includes two groups of second heating plates, which are respectively arranged at corresponding positions of the curing chamber and the post-curing chamber. Each group of second heating plates consists of two plates, and the two second heating plates are arranged at both ends of the transition section in the vertical direction.
5. The multi-cavity pultrusion die according to claim 1, characterized in that: The preforming section, transition section and curing section include an upper mold and a lower mold respectively, and the preforming section, transition section and curing section are respectively provided with a plurality of pins at both ends of the side, and the plurality of pins are used to quickly fix the upper mold and the lower mold of the preforming section, transition section and curing section.
6. The multi-cavity pultrusion die according to claim 5, characterized in that: A plurality of pre-tightening screws are arranged between the upper mold and the lower mold of the preforming section, the transition section and the curing section. The pre-tightening screws pre-tighten the upper mold and the lower mold, and then fix them through the pin shaft.
7. The multi-cavity pultrusion die according to claim 1, characterized in that: The transition section is provided with a glue injection hole, which is communicated with the transition cavity and is used for injecting resin into the transition cavity.
8. The multi-cavity pultrusion die according to claim 7, characterized in that: The transition section is provided with the glue injection holes at both ends in the vertical direction.