Machining die and method for woven spacer fabric composite board

Abstract

The invention belongs to the technical field of fabric composite board processing, and provides a processing mold and method for a woven spacer fabric composite board. The prefabricated part mold structure is arranged on the bottom mold and is used for processing and forming a prefabricated panel; a hot press; the composite board mold structure is placed on a hot press and is used for processing a resin composite board; the polyurethane foam is filled in the middle of the spacer fabric heat-preservation composite board, so that the spacer fabric heat-preservation composite board has ultralow heat conductivity and excellent heat-preservation and heat-insulation effects, meets the function requirements of heat-preservation and heat-insulation, and has the characteristics of light weight, easiness in forming, high strength, high modulus, impact resistance and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric composite plate processing, in particular to a processing mould and method of a woven spacer fabric composite plate. Background Art

[0002] With the rapid development of the automobile industry, the automobile parts industry has also developed rapidly. In recent years, the trend of lightweight materials has become more and more obvious;

[0003] Although traditional metal materials have high strength, they are heavy and have poor thermal insulation. Other materials, such as engineering plastics, fabrics, etc., have problems such as poor strength or insufficient thermal insulation. Therefore, there is an urgent need for a thermal insulation material with excellent performance and the ability to be lightweight.

[0004] To this end, those skilled in the art have proposed a processing mold and method for a woven spacer fabric composite plate to solve the problems raised by the background art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a processing mold and method for a woven spacer fabric composite plate to solve the material defect problem in the prior art.

[0006] The processing mold and method of woven spacer fabric composite board include: a bottom mold; a prefabricated part mold structure, which is arranged on the bottom mold and used for processing and molding the prefabricated board; a hot press; and a composite board mold structure, which is placed on the hot press and used for processing the resin composite board.

[0007] Preferably, the preform mold structure includes a plurality of side molds fixedly arranged on the bottom mold, and a top mold is fixedly arranged on the top of the plurality of side molds; a plurality of threaded shafts are screwed on the bottom mold, and a plurality of connecting holes are opened on the top mold, and the threaded shafts can pass through the inside of the connecting holes.

[0008] Preferably, a plurality of latch grooves are provided on the bottom mold, a latch plate is fixedly provided at the bottom of the side mold plate, and the latch groove and the latch plate can be engaged with each other; a fixing nut is screwed on the top of the threaded shaft located above the top mold.

[0009] Preferably, the composite board mold structure comprises a shaping mold placed on a hot press, an inner cavity is formed in the shaping mold, and the shaping mold is covered with multiple layers of polytetrafluoroethylene film through the inner cavity.

[0010] Preferably, the processing method of the woven spacer fabric composite sheet comprises the following steps:

[0011] Step 1: The selected reinforcing fabric raw material is high-strength low-stretch polyester filament, which is cleaned and the warp and weft yarns are wound. After the winding is completed, warping is performed, followed by drawing in and reeding;

[0012] Step 2: Tie the yarn, add spacers, pad yarn, etc., and divide the yarn into five bundles, adjust the tension and tie them to the fabric on the roll, with the five bundles having the same tension;

[0013] Step 3: Use the inching method to weave. After weaving to a certain length, you can weave continuously. After weaving is completed, cut the fabric and proceed to the next step of polyurethane foam filling;

[0014] Step 4: Select polyurethane foam as the filling material, open the preform mold structure, and cut the woven spacer fabric processed in step 3 into the required size;

[0015] Step 5: Fix the cut spacer fabric through the preform mold structure, stick double-sided tape on the reinforced iron plate at the edge of the preform mold, and tightly attach the fixed spacer fabric to the preform mold;

[0016] Step 6: Pour the uniformly mixed polyurethane foam material quickly into the fixed spacer fabric cavity in the preform mold before foaming, and close the preform mold;

[0017] Step 7: After 30 minutes, the mold can be disassembled and the filled prefabricated board can be taken out;

[0018] Step 8: Select epoxy resin as the resin matrix of the woven spacer fabric composite, select polyamide resin as the curing agent, mix the two in a ratio of one to one, and then add a certain amount of anhydrous ethanol as a diluent to obtain a resin composite material;

[0019] Step 9: Surface treatment of the prefabricated board. First, clean the polyurethane foam on the surface, then cut the edge of the prefabricated board to remove excess burrs, and then put the entire prefabricated board into a hot press for flattening.

[0020] Step 10: Turn on the upper mold heating switch of the hot press, adjust it to the preset heating temperature, and preheat the upper mold;

[0021] Step 11: Heat the water bath to 60 degrees, weigh the epoxy resin and polyamide resin in a beaker, mix them in a 1:1 ratio by mass, add 10% anhydrous ethanol as a diluent, stir evenly and put into the water bath to preheat for 20 minutes;

[0022] Step 12: Apply a release agent on the shaping mold, place the shaping mold, put in a suitable pad, pad the PTFE film under the shaping mold, and stick a piece of PTFE film on the surface of the upper mold of the hot press;

[0023] Step 13: Place a piece of polytetrafluoroethylene film between the inner wall of the inner cavity and the prefabricated sheet, and stick a sealing tape on the edge of the prefabricated sheet to form a molding space with a height of two millimeters;

[0024] Step 14: Pour the resin composite material into the molding space of the inner cavity, raise the lower mold of the hot press, and heat the resin composite material with the upper mold of the hot press to cure the resin composite material at high temperature;

[0025] Step 15: After the resin composite material is cured, demoulding is performed, and the other side of the prefabricated board is composited using the same process as step 14, and finally the resin composite of the prefabricated board is completed to obtain a resin composite board.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention fills polyurethane foam in the middle of the spacer fabric thermal insulation composite board, which has ultra-low thermal conductivity and excellent thermal insulation effect. It not only meets the functional requirements of thermal insulation, but also has the characteristics of light weight, easy molding, high strength and high modulus, and impact resistance.

[0028] 2. The present invention can effectively avoid the delamination failure of laminated composite materials by setting up spacer fabric reinforced composite plates, and has obvious advantages in fracture toughness, impact damage tolerance, etc., and has the characteristics of lightweight, improving fuel utilization, and making the spacer fabric insulation composite plates can improve the safety of industrial products such as automobiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of a foam preform mold of the present invention;

[0030] Figure 2 This is a structural diagram of the composite board mold of the present invention.

[0031] In the figure:

[0032] 1. Top mold; 2. Connecting hole; 3. Fixing nut; 4. Side mold plate; 5. Latch plate; 6. Latch slot; 7. Bottom mold; 8. Threaded shaft; 20. Hot press; 21. Shaping mold; 22. Polytetrafluoroethylene film; 23. Inner cavity. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] As attached Figure 1 To Attachment Figure 2 As shown:

[0035] The present invention provides a processing mold for woven spacer fabric composite panels, including: a bottom mold 7; a prefabricated part mold structure, arranged on the bottom mold 7, used for processing and molding prefabricated panels; a hot press 20; a composite panel mold structure, placed on the hot press 20, used for processing resin composite panels.

[0036] refer to Figure 1 , the preform mold structure includes a bottom mold 7, a side mold 4, a top mold 1, a threaded shaft 8 and a fixing nut 3;

[0037] A plurality of side mold plates 4 are fixedly connected to the bottom mold 7, so that the bottom mold 7 and the plurality of side mold plates 4 can form a square cavity, and a plurality of threaded shafts 8 are symmetrically screwed and connected to the bottom mold 7, so that the top mold 1 can be connected to the plurality of threaded shafts 8 through the plurality of connection holes 2 opened thereon, and the top mold 1 is fixedly connected to the top of the plurality of side mold plates 4, so that the polyurethane foam material and the woven spacer fabric are filled between the bottom mold 7 and the top mold 1 to form a prefabricated plate;

[0038] At the same time, a plurality of latch grooves 6 are opened on the bottom mold 7, and a latch plate 5 is fixedly connected to the bottom of the side mold 4, so that the side mold 4 can be easily installed on the bottom mold 7 through the latch plate 5 and the latch groove 6. Secondly, a fixing nut 3 is screwed and connected to the top mold 1 at the top of the threaded shaft 8, so that the fixing nut 3 can cooperate with the threaded shaft 8 to tightly fix the top mold 1 and the bottom mold 7 to the upper and lower sides of the plurality of side molds 4.

[0039] refer to Figure 2 The composite board mold structure includes a shaping mold 21, an inner cavity 23 and a polytetrafluoroethylene film 22; by placing the shaping mold 21 on the hot press 20, the prefabricated board can be easily filled with resin composite materials through the inner cavity 23 opened in the shaping mold 21, and then isolated and blocked by the polytetrafluoroethylene film 22 to prevent the resin composite materials from overflowing from the shaping mold 21, and finally heated and processed by the hot press 20.

[0040] The present invention provides a method for processing a woven spacer fabric composite sheet, comprising:

[0041] Step 1: The selected reinforcement fabric raw material is high-strength and low-stretch polyester filament, which is cleaned and the warp and weft yarns are wound. After the winding is completed, warping is performed, followed by drawing in and reeding. The main characteristics of polyester filament are high breaking strength, low breaking elongation, high molecular weight, excellent durability, etc. It has a large deformation range, high load-bearing capacity and good fatigue resistance;

[0042] Step 2: Tie the yarn, add spacers, pad yarn, etc., and divide the yarn into five bundles evenly. Adjust the tension and tie them to the fabric on the roll cloth. The five bundles have the same tension. The distance between the two spacers is 40 teeth. When installing, start from the left side, pull the binding yarn out of the teeth of the reed, and insert the two yarns into the teeth on the left and right sides of the current teeth in sequence. Put the spacer into the empty box teeth, push the heald apart, pass the spacer through the middle of the heald, and fix it on the screw behind the heald frame to complete the installation of the spacer;

[0043] Step 3: Use the inching method to weave. After weaving to a certain length, you can weave continuously. Before weaving, use the strands of waste cotton yarn as weft yarn for inching weaving. Generally, the tension of the lower layer is small, so you need to pad more waste cotton yarn until the tension of the upper and lower warp yarns is uniform. After weaving, cut the fabric and proceed to the next step of polyurethane foam filling;

[0044] Step 4: Select polyurethane foam as the filling material, open the preform mold structure, cut the woven spacer fabric processed in step 3 into the required size, and fix the cut spacer fabric with the preform mold structure to ensure that the upper and lower tissue surface layers are flat and minimize the occurrence of surface depression of the processed sandwich spacer fabric surface prefabricated board;

[0045] Step 5: Fix the cut spacer fabric through the prefabricated mold structure, stick double-sided tape on the reinforced iron plate at the edge of the prefabricated mold structure, and tightly attach the fixed spacer fabric to the prefabricated mold structure, which can also reduce the occurrence of unevenness on the surface of the prefabricated plate;

[0046] Step 6: Pour the evenly mixed polyurethane foam material into the fixed spacer fabric cavity in the preform mold before foaming, close the preform mold, and shape it at a temperature of 20°C to prevent the temperature from being too low and foaming insufficient, or the temperature from being too high and foaming too quickly, so that the mixed polyurethane foam cannot be filled into the preform mold structure;

[0047] Step 7: After 30 minutes, the prefabricated mold structure can be disassembled and the filled prefabricated panels can be taken out. After taking out the prefabricated panels, the storage barrels in which they are stored need to be sealed in time to avoid long-term contact with air, which may cause material deterioration;

[0048] Step 8: Select epoxy resin as the resin matrix of the woven spacer fabric composite, select polyamide resin as the curing agent, mix the two in a ratio of 1:1, and then add a certain amount of anhydrous ethanol as a diluent to obtain a resin composite material, and facilitate the control of the viscosity of the resin composite material;

[0049] Step nine: Surface treatment of the prefabricated board is performed. First, the polyurethane foam on the surface is cleaned. Then, the edge of the prefabricated board is trimmed to remove excess burrs. Then, the entire prefabricated board is placed in a hot press 20 for flattening.

[0050] Step 10: Turn on the upper mold heating switch of the hot press 20, adjust it to a predetermined heating temperature, and preheat the upper mold;

[0051] Step 11: Heat the water bath to 60°C, weigh epoxy resin and polyamide resin in a beaker, mix them in a 1:1 ratio by mass, add 10% anhydrous ethanol as a diluent, stir evenly and preheat in a water bath for 20 minutes. At this time, the viscosity of the resin composite material reaches the lowest, which is convenient for heating and shaping after filling;

[0052] Step 12: Apply a release agent on the shaping mold 21, place the shaping mold 21, put in a suitable pad, pad the PTFE film 22 under the shaping mold 21, and stick a piece of PTFE film 22 on the upper mold surface of the hot press 20, pad the PTFE film 22 under the shaping mold 21 to prevent the resin composite material from dripping onto the lower mold of the hot press 20, and stick a piece of PTFE film 22 on the upper mold surface of the hot press 20, because the PTFE film 22 will form wrinkles due to extrusion, thereby affecting the surface flatness of the resin composite material;

[0053] Step 13: Place a piece of polytetrafluoroethylene film 22 between the inner wall of the inner cavity 23 and the prefabricated sheet, and stick a sealing tape on the edge of the prefabricated sheet to form a molding space with a height of 2 mm, which is used to pour the resin composite material between the shaping mold 21 and the upper mold of the hot press 20, put the prefabricated material, and wrap the shaping mold 21 with tape for several turns to ensure that the shaping mold 21 is fixed and stable;

[0054] Step 14: Pour the resin composite material into the molding space of the inner cavity 23, raise the lower mold of the hot press 20, and heat the resin composite material with the upper mold of the hot press 20 to cure the resin composite material at high temperature;

[0055] Step 15: After the resin composite material is cured, demoulding is performed, and the other side of the prefabricated board is composited using the same process as step 14, and finally the resin composite of the prefabricated board is completed to obtain a resin composite board.

[0056] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A processing mold for a woven spacer fabric composite sheet, characterized in that: include: Bottom mold (7); A prefabricated part mold structure is arranged on the bottom mold (7) and is used for processing and molding the prefabricated plate; Heat press (20); The composite board mold structure is placed on a hot press (20) and is used for processing resin composite boards.

2. The processing mold for the woven spacer fabric composite sheet as claimed in claim 1, characterized in that: The preform mold structure comprises a plurality of side mold plates (4) fixedly arranged on a bottom mold plate (7), and a top mold plate (1) is fixedly arranged on the top of the plurality of side mold plates (4); The bottom mold (7) is screwed with a plurality of threaded shafts (8), the top mold (1) is provided with a plurality of connection holes (2), and the threaded shafts (8) can penetrate the inside of the connection holes (2).

3. The processing mold for the woven spacer fabric composite sheet as claimed in claim 2, characterized in that: The bottom mold (7) is provided with a plurality of latch grooves (6), a latch plate (5) is fixedly provided at the bottom of the side mold plate (4), and the latch grooves (6) and the latch plate (5) can be mutually engaged and connected; The top of the threaded shaft (8) is located above the top mold (1) and is screwed with a fixing nut (3).

4. The processing mold for the woven spacer fabric composite sheet as claimed in claim 1, characterized in that: The composite board mold structure comprises a shaping mold (21) placed on a hot press (20), an inner cavity (23) is provided in the shaping mold (21), and the shaping mold (21) is covered with a multi-layer polytetrafluoroethylene film (22) through the inner cavity (23).

5. The method for processing the woven spacer fabric composite sheet according to claim 1, characterized in that: A processing mold for a woven spacer fabric composite sheet material according to any one of claims 1 to 4; the processing method of the woven spacer fabric composite sheet material comprises: Step 1: The selected reinforcing fabric raw material is high-strength low-stretch polyester filament, which is cleaned and the warp and weft yarns are wound. After the winding is completed, warping is performed, followed by drawing in and reeding; Step 2: Tie the yarn, add spacers, pad yarn, etc., and divide the yarn into five bundles, adjust the tension and tie them to the fabric on the roll, with the five bundles having the same tension; Step 3: Use the inching method to weave. After weaving to a certain length, you can weave continuously. After weaving is completed, cut the fabric and proceed to the next step of polyurethane foam filling; Step 4: Select polyurethane foam as the filling material, open the preform mold structure, and cut the woven spacer fabric processed in step 3 into the required size; Step 5: Fix the cut spacer fabric through the preform mold structure, stick double-sided tape on the reinforced iron plate at the edge of the preform mold, and tightly attach the fixed spacer fabric to the preform mold; Step 6: Pour the uniformly mixed polyurethane foam material quickly into the fixed spacer fabric cavity in the preform mold before foaming, and close the preform mold; Step 7: After 30 minutes, the mold can be disassembled and the filled prefabricated board can be taken out; Step 8: Select epoxy resin as the resin matrix of the woven spacer fabric composite, select polyamide resin as the curing agent, mix the two in a ratio of 1:1, and then add a certain amount of anhydrous ethanol as a diluent to obtain a resin composite material; Step nine: performing surface treatment on the prefabricated board, firstly cleaning the polyurethane foam on the surface, then cutting the edge of the prefabricated board to remove the excess burrs, and then placing the entire prefabricated board into a hot press (20) for flattening treatment; Step 10: Turn on the upper mold heating switch of the hot press (20), adjust it to a predetermined heating temperature, and preheat the upper mold; Step 11: Heat the water bath to 60°C, weigh the epoxy resin and polyamide resin in a beaker, mix them in a 1:1 ratio by mass, add 10% anhydrous ethanol as a diluent, stir evenly, and preheat in a water bath for 20 minutes; Step 12: Apply a release agent on the shaping mold (21), place the shaping mold (21), put in a suitable pad, pad the bottom of the shaping mold (21) with a polytetrafluoroethylene film (22), and stick a piece of polytetrafluoroethylene film (22) on the upper mold surface of the hot press (20); Step 13: Place a piece of polytetrafluoroethylene film (22) between the inner wall of the inner cavity (23) and the prefabricated plate, and stick a sealing tape on the edge of the prefabricated plate to form a molding space with a height of 2 mm; Step 14: pouring the resin composite material into the molding space of the inner cavity (23), raising the lower mold of the hot press (20), and heating the resin composite material with the upper mold of the hot press (20) to cure the resin composite material at high temperature; Step 15: After the resin composite material is cured, demoulding is performed, and the other side of the prefabricated board is composited using the same process as step 14, and finally the resin composite of the prefabricated board is completed to obtain a resin composite board.

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