A PMI foam structure thickness-adjustable foaming forming device

Abstract

The application discloses a foaming forming equipment with adjustable thickness of PMI foam structure, a lower support frame is connected to a lower panel and supports the lower panel in a frame, an upper support frame is connected to an upper panel and supports the upper panel in the frame, a surrounding open setting of a foaming space is used for expanding PMI foaming raw materials to the surroundings, a plurality of limiting pieces are arranged on the frame, a positioning frame is fixed above the upper support frame through the limiting pieces and can abut against the upper support frame when the upper panel moves upward, each limiting piece can adjust the connection position with the frame, thereby adjusting the interval between the positioning frame and the lower panel and further adjusting the thickness of the PMI foaming raw materials in the foaming forming. The application can adjust the thickness of the foaming forming blank according to the requirement of the thickness of the bad material, greatly reduces the allowance of the later processing cutting, improves the effective utilization rate of the foaming material, reduces the processing time and cost, and improves the processing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of PMI foam foaming, and in particular to a foaming molding device with adjustable thickness of a PMI foam structural part. Background Art

[0002] PMI foam, a new polymer structural foam material, boasts low density, high-temperature resistance, excellent wave transmission, and high specific strength. It exhibits promising application prospects in aerospace, medical, military, electronic communications, radar, and other fields. The military industry, in particular, is increasingly favoring the use of PMI foam in the production and manufacture of adapter-type products. Intensifying competition within the industry, coupled with the increasing need for growth and cost reduction and efficiency gains, has led to higher requirements for the material cost, processing costs, and production efficiency of PMI foam-related products.

[0003] PMI foam is expensive, and the shapes of PMI foam workpieces vary across industries. However, traditional flat-sheet PMI foam panels face the following production challenges: The PMI foam blanks cannot be molded to the desired shape; they typically end up in a flat sheet, which is then stacked to form a blank before being processed using processing equipment. Consequently, the effective utilization of the foam material is low, with only approximately 50% of the flat sheet foam used to form the curved adapter body. Furthermore, the large machining margins result in long tool paths, long processing times, high costs, and low efficiency. Furthermore, due to the thickness limitations of the flat sheet foam, the sheets typically need to be bonded and stacked to achieve the desired thickness, impacting the overall integrity of the product. The adhesive used increases the weight and density of the product, and creates the risk of delamination. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a PMI foam structural part thickness adjustable foaming molding equipment, which can produce blanks foamed from PMI foam raw materials according to the shape, and can adjust the thickness of the foamed blanks by adjusting the equipment. The effective utilization rate of the foam material is high, the processing efficiency is high, and the cost is low.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The cam is fixed to the upper and lower panels so as to be able to move the upper and lower panels upwards, so as to prevent the upper and lower panels from being damaged.

[0007] As a further improvement of the above technical solution:

[0008] A positioning frame is placed above the upper support frame, and the positioning frame is placed in the frame. Each of the limiting members is connected to the positioning frame and abuts against the upper support frame through the positioning frame.

[0009] The upper support frame is provided with a plurality of guide rods, and the positioning frame is provided with a plurality of guide holes. Each of the guide rods is vertically arranged and movably passes through the guide hole.

[0010] The lower panel and the upper panel are both provided with shaping strips, the lower support frame is provided with a lower limit groove, the lower limit groove is arranged correspondingly to the shaping strip on the lower panel up and down, and can abut and cooperate, the upper support frame is provided with an upper limit groove, the upper limit groove is arranged correspondingly to the shaping strip on the upper panel up and down, and can abut and cooperate.

[0011] The shaping strip is tapered, and the cross section along the length is L-shaped or U-shaped.

[0012] The lower panel and the upper panel are provided with a plurality of through ventilation slots, and each of the ventilation slots is any one of a circular hole, a rectangular hole, a diamond hole, a polygonal hole, a long slot hole and a special-shaped hole.

[0013] The lower panel and the upper panel are both woven steel mesh or grid plates, and the grid plates are provided with a plurality of parallel and spaced bars, each of which is any one of a round rod, a round tube, a rectangular tube, a polygonal bar, an L-shaped bar and a special-shaped bar.

[0014] The upper support frame and the lower support frame are both formed by connecting any one of rectangular tubes, L-shaped materials, round tubes, channel steels and U-shaped steels.

[0015] The top surface of the lower panel and the bottom surface of the upper panel are any one of a flat surface, an inclined surface, an arc surface, a curved surface and a conical surface.

[0016] Each of the limiting members is a screw rod, and a plurality of screw holes are provided on the frame. Each of the screw rods is threadedly connected to the screw hole and can adjust the length of downward extension by rotation.

[0017] Each of the limiting members is a limiting block. A hole group is provided at each of the four corners of the frame. Each hole group includes a plurality of adjustment holes, which are evenly arranged in the vertical direction. Each limiting block is fastened to one of the plurality of adjustment holes by a bolt. Compared with the prior art, the advantages of the present invention are:

[0018] The present invention can produce a blank formed by foaming PMI raw materials by forming a conformable foaming space by setting the upper panel and the lower panel at intervals; through the different shapes of the bottom surface of the upper panel and the top surface of the lower panel, blanks with different shapes and specifications can be produced, such as a curved plate, the curvature of which can be set according to product requirements; thereby greatly reducing the allowance for subsequent processing and cutting, improving the effective utilization rate of the foaming material, reducing the time and cost of processing, and improving processing efficiency; through the upper panel that can move up and down, the upper panel is in a When placed statically on PMI foam stock, the foam expands during the foaming process, pushing the upper panel upward. The spacing between the upper panel and the lower panel at its highest position can be adjusted based on the required thickness of the blank by adjusting multiple limiters that restrict the upper panel's movement. The expanded PMI foam pushes against the upper panel, causing the upper support frame to abut against the limiters, preventing further upward movement of the upper panel and thus providing a positioning function. During this positioning, the height of the upper panel's bottom surface relative to the top surface of the lower panel determines the thickness of the foamed blank. Using this foaming equipment can significantly reduce the processing material costs of adapter-type products, improve the integrity and production efficiency of the adapter, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a foaming molding device with adjustable thickness for PMI foam structural parts.

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of a foaming molding device with adjustable thickness for PMI foam structural parts.

[0021] Figure 3 A schematic diagram of the framework structure.

[0022] Figure 4 Schematic diagram of the structure of the positioning frame.

[0023] Figure 5 Schematic diagram of the assembly structure of the lower panel and the lower support frame.

[0024] Figure 6 Schematic diagram of the assembly structure of the upper panel and the upper support frame.

[0025] Legend:

[0026] 1. Frame; 2. Upper panel; 21. Upper support frame; 211. Positioning frame; 212. Guide rod; 213. Guide hole; 3. Lower panel; 31. Lower support frame; 4. Conformal foaming space; 5. Molding strip; 51. Lower limit groove; 52. Upper limit groove; 61. Screw; 611. Screw hole; 62. Limit block; 621. Adjustment hole. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-6As shown, the foaming molding device of the PMI foam structural member with adjustable thickness of this embodiment includes a frame 1, and the frame 1 is provided with at least one set of detachable upper panel 2, lower panel 3 and positioning frame 211, the upper panel 2 is arranged above the lower panel 3, and forms a conformal foaming space 4 between the lower panel 3 and the upper panel 2, the lower panel 3 is connected to the lower support frame 31, and is supported and placed in the frame 1 by the lower support frame 31, the upper panel 2 is connected to the upper support frame 21, and is placed in the frame 1 by the upper support frame 21, and the conformal foaming space 4 is used to accommodate the foaming expansion of the PMI foam raw material. The conformable foaming space 4 is open on all sides and is used to allow the PMI foam raw material to expand in all directions. The frame 1 is provided with multiple limiters. The positioning frame 211 is fixedly arranged above the upper support frame 21 through the multiple limiters and can abut against the upper support frame 21 when the upper panel 2 moves upward. Each limiter can adjust the connection position with the frame 1, thereby adjusting the distance between the positioning frame 211 and the lower panel 3, and further adjusting the thickness of the foamed PMI foam raw material. The conformable foaming space 4 formed by the interval arrangement of the upper panel 2 and the lower panel 3 can be used to form a blank formed by foaming the PMI foam raw material; through the different shapes of the bottom surface of the upper panel 2 and the top surface of the lower panel 3, blanks of different shapes and specifications can be produced, such as a curved plate, the curvature of which can be set according to product requirements; thereby greatly reducing the allowance for post-processing cutting, improving the effective utilization rate of the foaming material, reducing the time and cost of processing, and improving processing efficiency; through the upper panel 2 that can move up and down, the upper panel 2 is stationary when the PMI foam raw material is not foamed. The state of being placed on the PMI foam raw material, during the foaming process of the PMI foam raw material, its foam expands and pushes the upper panel 2 upward; according to the requirements of the blank thickness, the distance between the upper panel 2 and the lower panel when it is at the highest position can be adjusted by adjusting the multiple limiters that limit the movement position of the upper panel 2. The foaming expansion of the PMI foam raw material pushes the upper panel 2, so that the upper support frame 21 abuts against the limiters, thereby preventing the upper panel 2 from continuing to move upward, and playing a positioning role. During this positioning, the height of the bottom surface of the upper panel 2 relative to the top surface of the lower panel 3 determines the thickness of the foamed blank. The use of this foaming molding equipment can greatly reduce the cost of processing materials for adapter-type products, improve the integrity and production efficiency of the adapter, and has a wide range of applications. The foaming molding equipment is simple in design and easy to operate. Operators only need simple technical training to operate it, and no special training is required.

[0029] In this embodiment, a positioning frame 211 is placed above the upper support frame 21. The positioning frame 211 is placed in the frame 1. Each limiting member is connected to the positioning frame 211 and abuts against the upper support frame 21 through the positioning frame 211. The positioning frame 211 is connected to the frame 1 through multiple limiting members. By adjusting the limiting members, the height of the positioning frame 211 can be adjusted so that the positioning frame 211 can fit closely with the upper support frame 21.

[0030] In this embodiment, the upper support frame 21 is equipped with a plurality of guide rods 212, and the positioning frame 211 is provided with a plurality of guide holes 213. Each guide rod 212 is vertically disposed and movably extends through the guide holes 213. The guide rods 212 guide the upper support frame 21, allowing for free vertical movement. The guide rods 212 are mounted on the upper support frame 21 to prevent the upper support frame 21 from becoming misaligned or stuck during the foaming process due to uneven foaming of the PMI foaming material.

[0031] In this embodiment, both the lower panel 3 and the upper panel 2 are provided with shaping strips 5, and the lower support frame 31 is provided with a lower limiting groove 51, which is vertically corresponding to and abutting against the shaping strip 5 on the lower panel 3. The upper support frame 21 is provided with an upper limiting groove 52, which is vertically corresponding to and abutting against the shaping strip 5 on the upper panel 2. During the foaming and expansion process, the upper panel 2 and the lower panel 3 can achieve the predetermined shape specifications through the abutment and limitation of the shaping strips 6 and the limiting grooves.

[0032] In this embodiment, the shaping strip 5 is tapered, and the cross section along the length is L-shaped or U-shaped. The tapered shaping strip 6 is easy to manufacture and has low cost.

[0033] In this embodiment, multiple ventilation slots are provided through the lower panel 3 and the upper panel 2. Each ventilation slot can be any of a circular hole, a rectangular hole, a diamond hole, a polygonal hole, an elongated hole, and a special-shaped hole. The multiple ventilation slots provide ventilation during the foaming process, ensuring a uniform temperature distribution on the foam surface, thereby ensuring the quality of the foam formed.

[0034] In this embodiment, both the lower panel 3 and the upper panel 2 are woven steel mesh or grille panels, each having a plurality of parallel, spaced-apart bars. Each bar can be any of round rods, round tubes, rectangular tubes, polygonal bars, L-shaped bars, and special-shaped bars. Woven steel mesh or grille panels provide excellent ventilation and are easy to manufacture or purchase.

[0035] In this embodiment, the upper support frame 21 and the lower support frame 31 are each formed by connecting any one of rectangular tubes, L-shaped bars, round tubes, channel steels, and U-shaped bars. The upper support frame 21 and the lower support frame 31 can be assembled by simply machining conventional profiles and plates and then welding them together, resulting in low production costs. The materials used can be metal, plastic, composite materials, etc.

[0036] In this embodiment, the top surface of the lower panel 3 and the bottom surface of the upper panel 2 are any one of a flat surface, an inclined surface, an arc surface, a curved surface, and a conical surface. By making the bottom surface of the upper panel 2 and the top surface of the lower panel 3 different in shape, they can be concentric or non-concentric, and blanks of different shapes and specifications can be produced, thereby greatly reducing the allowance for subsequent processing and cutting, improving the effective utilization rate of the foaming material, reducing the time and cost of processing, and improving processing efficiency.

[0037] In this embodiment, each stopper is a screw 61. Frame 1 is provided with multiple screw holes 611. Each screw 61 is threadedly connected to a screw hole 611 and can be rotated to adjust the length of its downward extension. Positioning frame 211 is suspended from the crossbeam of frame 1 via screws 61. Adjusting the screws 61 and nuts allows the height of positioning frame 211 to be adjusted and secured.

[0038] In another embodiment, each limiting member is a limiting block 62. A hole group is provided at each of the four corners of the frame 1. Each hole group includes a plurality of adjustment holes 621, which are evenly spaced vertically. Each limiting block 62 is fastened to one of the adjustment holes 621 via a bolt. The limiting blocks 62 are angle brackets, which are fixed to the adjustment holes 621 at the appropriate height according to the thickness requirements of the blank using bolts and nuts, and then tightened and locked.

[0039] Foam molding operation steps:

[0040] 1. Based on the required thickness of the adapter product, select the appropriate upper and lower panels (2) and (3). Use pre-coated PMI foaming material. Heat and pre-bend the pre-coated panels before foaming. There are no specific requirements for the curvature; a rough bend is sufficient. This ensures that the pre-coated panels have a certain degree of conformability, facilitating better conformal foaming.

[0041] 2. Fix the lower support frame 31 on the frame 1 and tighten it with bolts, then place the upper support frame 21 on the lower support frame 31; and install the guide rod 212 on the upper support frame 21.

[0042] 3. Calculate and adjust the height of the positioning frame 211 based on the thickness of the foam blank of the adapter product. At the same time, align the guide rod 212 and insert it into the guide hole 213 on the crossbeam of the positioning frame 211. Then tighten the lock nut to secure the positioning frame 211. After tightening, move the upper shaping module up and down to check for any sticking or misalignment.

[0043] 4. Place the pre-polymer plate in the conformal foaming space 4 between the upper panel 2 and the lower panel 3, and adjust the position so that the pre-polymer plate is centered; the upper panel 2 is pressed on the top of the pre-polymer plate, and the weight of the upper panel 2 and the upper support frame 21 provides a certain pressure on the pre-polymer plate to reduce its deviation.

[0044] 5. Place the entire foaming molding equipment in the oven, adjust the oven parameters, and then start the oven to allow the pre-polymerized plate to begin foaming. During the foaming process, the pre-polymerized plate continuously expands in all directions, its bottom surface completely conforming to the top surface of the lower panel 3, and its top surface pushes the upper panel 2, causing it to move upward. When the upper panel 2 moves to abut against the limit block 62, it stops moving. The foam continues to expand until the top surface completely conforms to the bottom surface of the upper panel 2; finally, the foaming is completed.

[0045] The above is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiment. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of the present invention should also be considered as the scope of protection of the present invention.

Claims

1. A PMI foam structural part thickness adjustable foaming molding equipment, characterized in that: The invention comprises a frame (1), wherein the frame (1) is provided with at least one set of detachable upper panels (2), lower panels (3) and positioning frames (211), wherein the upper panel (2) is provided above the lower panel (3) and forms a conformal foaming space (4) between the upper panel (2) and the lower panel (3), wherein the lower panel (3) is connected to a lower support frame (31) and is supported and placed in the frame (1) by the lower support frame (31), wherein the upper panel (2) is connected to an upper support frame (21) and is placed in the frame (1) by the upper support frame (21), and wherein the conformal foaming space (4) is used to accommodate PM. The foaming expansion of the PMI foaming material, the four sides of the conformable foaming space (4) are open and used to expand the PMI foaming material in all directions, the frame (1) is provided with a plurality of limiting members, the positioning frame (211) is fixedly arranged above the upper support frame (21) through the plurality of limiting members, and can abut against the upper support frame (21) when the upper panel (2) moves upward, each of the limiting members can adjust the connection position with the frame (1), thereby adjusting the interval between the positioning frame (211) and the lower panel (3), and further adjusting the thickness of the foamed PMI foaming material; The upper support frame (21) is provided with a plurality of guide rods (212), and the positioning frame (211) is provided with a plurality of guide holes (213), and each of the guide rods (212) is vertically arranged and movably penetrates the guide hole (213); The lower panel (3) and the upper panel (2) are both provided with a shaping strip (5); the lower support frame (31) is provided with a lower limit groove (51); the lower limit groove (51) and the shaping strip (5) on the lower panel (3) are arranged in correspondence with each other and can be abutted together; the upper support frame (21) is provided with an upper limit groove (52); the upper limit groove (52) and the shaping strip (5) on the upper panel (2) are arranged in correspondence with each other and can be abutted together.

2. The PMI foam structural part thickness adjustable foaming molding equipment according to claim 1, characterized in that: The shaping strip (5) is tapered, and its cross section along the length direction is L-shaped or U-shaped.

3. The foaming molding equipment for PMI foam structural parts with adjustable thickness according to claim 1, characterized in that: The lower panel (3) and the upper panel (2) are provided with a plurality of through ventilation slots, each of which is any one of a circular hole, a rectangular hole, a diamond hole, a polygonal hole, a long slotted hole and a special-shaped hole.

4. The foaming molding equipment for PMI foam structural parts with adjustable thickness according to claim 1, characterized in that: The lower panel (3) and the upper panel (2) are both woven steel wire mesh or grid plates, and the grid plates are provided with a plurality of parallel and spaced bars, each of which is any one of a round bar, a round tube, a rectangular tube, a polygonal bar, an L-shaped bar and a special-shaped bar.

5. The foaming molding equipment for PMI foam structural parts with adjustable thickness according to claim 1, characterized in that: The upper support frame (21) and the lower support frame (31) are both formed by connecting any one of rectangular tubes, L-shaped bars, round tubes, channel steels and U-shaped steels.

6. The PMI foam structural member thickness adjustable foaming molding equipment according to claim 1, characterized in that: The top surface of the lower panel (3) and the bottom surface of the upper panel (2) are either a flat surface or a curved surface.

7. The foaming molding equipment for PMI foam structural parts with adjustable thickness according to any one of claims 1 to 6, characterized in that: Each of the limiting members is a screw rod (61), and a plurality of screw holes (611) are provided on the frame (1). Each of the screw rods (61) is threadedly connected to the screw hole (611) and can adjust the length of downward extension by rotation.

8. The foaming molding equipment for PMI foam structural parts with adjustable thickness according to any one of claims 1 to 6, characterized in that: Each of the limiting members is a limiting block (62), and a hole group is provided at each of the four corners of the frame (1), each of the hole groups includes a plurality of adjustment holes (621), and the plurality of adjustment holes (621) are evenly arranged in a vertical direction, and each of the limiting blocks (62) is fastened to one of the plurality of adjustment holes (621) by a bolt.

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