CN112606304A - Manufacturing and mounting method of curved surface projection screen capable of being rapidly disassembled and assembled - Google Patents
Manufacturing and mounting method of curved surface projection screen capable of being rapidly disassembled and assembled Download PDFInfo
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- CN112606304A CN112606304A CN202011362930.3A CN202011362930A CN112606304A CN 112606304 A CN112606304 A CN 112606304A CN 202011362930 A CN202011362930 A CN 202011362930A CN 112606304 A CN112606304 A CN 112606304A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A method for manufacturing and installing a curved surface projection screen capable of being quickly disassembled and assembled relates to a method for manufacturing and installing a projection screen. The invention aims to solve the problem that the final curved surface precision, the installation effect and the installation period of a product are influenced by the existing manufacturing and installation method of the projection screen. The method comprises the following steps: manufacturing a mould: using a low shrinkage resin and a chopped strand mat forming die; detecting the curved surface of the mold and installing a reinforcing frame; step two: preparing raw materials: preparing the sandwich foam: installation of the trapezoidal foam board: frame reinforcing plate and connecting hole frame: step three: forming a product; step four: product installation: processing a plurality of connecting holes on the outer surface of the molded product prepared in the third step, connecting the product by using an M8 multiplied by 35mm bolt, filling the joint of the inner surface by using nitro type automobile putty, checking by using a curvature template, and confirming that the curvature of the joint meets the requirement, thereby finishing the manufacture and installation of the curved surface projection screen. The invention is used for manufacturing the projection screen.
Description
Technical Field
The invention relates to a method for manufacturing and installing a projection screen, in particular to a method for manufacturing and installing a curved surface projection screen capable of being quickly disassembled and assembled.
Background
With the continuous development of projection screen products and the demands of market competition, customers put forward more definite and strict requirements on the spherical curvature, the installation precision and the installation period of the projection screen products. The existing projection screen product can not meet the use requirements of customers, and some problems are in urgent need of improvement. The mould, the core layer foam and the process method of the product all have certain influence on the structure size of the product, the shrinkage rate of the unsaturated polyester resin used in the existing mould forming is 3%, the whole foam plate is used as a reinforcing layer on the back of the mould, the radial shrinkage deformation constraint effect on the mould is not ideal, and the mould deformation directly causes the product size to deviate. The existing projection screen product is formed by a wet forming process, errors are overlapped due to the fact that multiple times of laying and forming are needed, core layer foam is attached to a mold by means of vacuum pressure during forming, the core layer foam has certain rigidity and cannot be completely attached to the mold, and deviation of curvature of the product can be caused. The connecting hole is processed after the product is demoulded, and the use angle and the force of the drill bit cannot be guaranteed to be completely consistent, so that the position of the connecting hole is deviated, and the assembling precision is influenced. The covering plate and the repair layer between the product units take a lot of time, and the installation period is remarkably prolonged. These factors will directly affect the final curved surface accuracy, mounting effect and production cycle of the product.
In summary, the existing methods for manufacturing and installing the projection screen have the problem of affecting the final curved surface precision, the installation effect and the production cycle of the product.
Disclosure of Invention
The invention aims to solve the problem that the final curved surface precision, the installation effect and the installation period of a product are influenced in the existing manufacturing and installation method of the projection screen. Further provides a method for manufacturing and installing the curved surface projection screen capable of being quickly assembled and disassembled.
The technical scheme of the invention is as follows: a method for manufacturing and installing a curved surface projection screen capable of being quickly disassembled and assembled comprises the following steps:
the method comprises the following steps: manufacturing a mould:
the method comprises the following steps: using a low shrinkage resin and a chopped strand mat forming die;
after the two arc male molds are cured, a reinforcing frame is arranged at the back of the female mold, the reinforcing frame is a field-shaped reinforcing frame formed by vertically and horizontally arranging a plurality of square steel pipes, a part with a local gap between the reinforcing frame and the back of the female mold is filled with a chopped strand mat, the inner part and the surrounding space of the reinforcing frame are filled with a polyether polyol and isocyanate mixture, the surrounding environment temperature is controlled between 20 ℃ and 25 ℃, the surface is repaired and leveled after the mixture foaming material is fully cured, and the mixture foaming material is integrally wrapped by 2 layers of chopped strand mats and low-shrinkage resin;
the first step is: detecting the curved surface of the mold and installing a reinforcing frame;
after the curved surface of the female die is confirmed to meet the requirements by using a three-coordinate measuring instrument inspection device, marking the vertex and the midpoint of the overall dimension of the product on the female die, and assembling die frames according to the marked points;
step two: preparing raw materials:
step two, preparing the sandwich foam:
dividing the polyurethane foam board into equal-size trapezoidal foam boards, preheating the trapezoidal foam boards in an oven, tightly clamping the trapezoidal foam boards by using a fixture after the trapezoidal foam boards are preheated, putting the trapezoidal foam boards into the oven for continuous heating, taking out the fixture, naturally cooling to room temperature, and taking out the trapezoidal foam boards for later use;
step two: installation of the trapezoidal foam board:
placing the trapezoidal foam boards into spaces of a die reinforcing frame for fixing, trimming the edges of the trapezoidal foam boards and reserving a gap between the edges of the trapezoidal foam boards and a die frame for 5mm, wherein the reserved gap between every two adjacent trapezoidal foam boards is 10mm, the gap between every two adjacent trapezoidal foam boards is filled with a mixture of polyurethane rigid foam combined polyether and an isocyanate component, and after the mixture foam is fully cured, removing redundant foam by taking the trapezoidal foam boards as a standard;
step two and step three: frame reinforcing plate and connecting hole frame:
according to mould frame size numerical control processing frame reinforcing plate, the frame reinforcing plate size all is 2mm less than the frame size all around, sets up a plurality of connect the via hole on the frame reinforcing plate along its outer circumferencial direction, connect the via hole's size for phi 8.60 +0.1mm, the thickness of the reinforcing plate template is 3 mm;
the connecting hole frame is made of 80X 60X 2mm glass fiber reinforced plastic pultruded pipe by cutting the pultruded pipe into a 30mm thick square frame, placing a polyurethane foam plate with equal thickness in the square frame of the pultruded pipe, bonding a 1mm thick glass fiber reinforced plastic plate with resin to seal the openings at the two sides of the square frame of the pultruded pipe, and machining the phi 8.6 in the center of one 80mm long side0 +0.1mm holes with the depth of 50 mm;
step three: and (3) product molding:
coating a release agent on the female die manufactured in the step one, laying an outer skin, installing a positioning pin on a die frame, fixing a 3mm thick frame reinforcing plate and a connecting hole frame on the positioning pin, and filling a gap between the connecting hole frame and the skin with glass fiber;
placing the sandwich foam plate in the step two into a die frame, and removing foam at the interference position;
laying an inner skin, closing the male die, measuring the air tightness of a die cavity of the die, requiring the vacuum pressure to be less than or equal to-0.08 MPa, closing the vacuum pressure for 30 minutes, reducing the vacuum pressure in the die cavity to be less than 0.01MPa, and performing resin introduction molding after the pressure of the die cavity meets the requirement;
step four: product installation:
processing a plurality of phi 45mm connecting holes on the outer surface of the molded product prepared in the third step, connecting the product by using an M8 multiplied by 35mm bolt, covering the phi 45mm hole by using a decorative cover, filling the inner surface seam by using nitro-type automobile putty, wherein the ratio of the automobile putty to the curing agent is 5: 1, grinding by using a 240-mesh dry grinder until the inner surface is in smooth transition, checking by using a curvature template, and confirming that the curvature of a joint meets the requirement, thereby finishing the manufacture and installation of the curved surface projection screen.
Compared with the prior art, the invention has the following effects:
1. according to the invention, the epoxy resin with low shrinkage rate is used for replacing unsaturated polyester resin during the die forming, the shrinkage rate of the epoxy resin is 1%, the size error caused by the shrinkage deformation of the die is obviously reduced, the latticed square steel tube frame is added on the back of the die, and the deformation resistance of the die is improved.
2. The shape and position frame of the die is manufactured by cutting a carbon steel plate with the thickness of 6mm by laser, the laser cutting belongs to hot processing, and the shape and position frame can expand with heat and contract with cold during processing. The existing die shape and position frame is manufactured by machining a 20mm thick steel plate through numerical control, the size precision of the frame can be controlled to be +/-0.2 mm, the flatness precision of the frame can be guaranteed due to the increase of the thickness, and the flatness of the frame of a product is guaranteed. The frame end processing connecting hole uses the bolt can connect into whole with the frame, processes the locating pin hole on every frame, uses locating pin shaping connecting hole when the product shaping, guarantees that connecting hole size position is unanimous on every product, improves the installation accuracy, sees figure 3.
3. The product of the invention is a sandwich structure, the former product is formed by a wet forming process, the outer skin, the sandwich layer and the inner skin are sequentially formed, each layer is required to be coated with resin for bonding, and the lower layer bonding operation is carried out after the resin is cured and polished, so that 3 times of operation error superposition occurs, and the curved surface precision of the product is influenced. The existing product is designed into a diversion process for forming, raw materials of the product are firstly paved on a mould layer by layer, the mould is fixed according to the position requirement, and then resin is introduced into the mould by LRTM equipment and vacuum pressure, so that the product can be formed at one time.
In the prior art, square steel pipes are embedded in the periphery of a product, the square steel pipes are formed into curvatures by using a plate bending machine, and the curvature precision of the square steel pipes cannot meet the use requirement due to the improvement of the dimensional precision of a die and the use of a vacuum flow guide process. The existing product uses a 3mm glass steel plate to reinforce a product frame, a glass steel pultrusion tube frame is used for manufacturing a bolt connecting hole frame, foam occupation is filled in the glass steel pultrusion tube frame, and foam is taken out from an opening on the outer surface of the product after molding. Because the negative pressure is in the mould cavity, if foam occupation is not filled in the glass fiber reinforced plastic pultrusion tube frame, resin can enter the glass fiber reinforced plastic pultrusion tube frame along the connecting hole during molding, and the resin is very difficult to take out after molding.
In the past, long-strip-shaped polyurethane foam boards are used for manufacturing sandwich foam during product forming, the long-strip foam boards are placed on a mold before forming, weights are used for pressing the foam boards, the foam boards are trimmed according to the appearance of the mold, the foam boards are spliced and placed in the mold during product forming, and the curvature error of the sandwich foam is large due to the fact that stress exists in the long-strip foam boards and the loads of the weights are uneven. The existing foam board is manufactured by adopting a preheating and shaping process, the foam board is firstly divided into equal-size trapezoidal foam boards, after the foam board is preheated, the foam board is clamped by a tool with the same curvature as a mold, the tool carries trapezoidal foam to continuously heat for a period of time, the foam board is naturally cooled to room temperature and then taken out, the formed foam board is placed into the mold to be fixed, a certain gap is reserved between the foam boards, and the foam board is bonded into a whole by polyurethane rigid foam combined polyether and isocyanate component mixture. Because the heating and natural cooling foam board releases the internal stress, the bonded foam board can not be deformed any more, and the attaching degree of the sandwich foam board and the die is better.
In the prior art, connecting bolts are installed in a product, a cover plate and a 100mm wide repairing layer are required to be installed and filled at the inner surface of a product joint, the repairing layer is required to be polished to the same curvature as the inner surface of the product, the error is less than 2mm, and the working time accounts for about one half of the whole installation time. The existing product is provided with bolts at the outside, an inner surface covering plate is omitted, the inner surface only needs to be repaired by about 3mm of seam, the repairing difficulty is greatly reduced, and the installation efficiency is improved remarkably.
Drawings
Fig. 1 is a front view of the overall structure of the product of the present invention. Fig. 2 is a top view of fig. 1. Fig. 3 is a side view of fig. 1. Fig. 4 is a schematic cross-sectional view of a prior art male mold and a reinforced foam board (prior art). Fig. 5 is a schematic cross-sectional view of the male mold, reinforcing frame and mix filler of the present invention. Fig. 6 is a top view of fig. 5. FIG. 7 is a schematic view of the mounting of the die frame on the male die. FIG. 8 is a front cross-sectional view of the mold rim assembly. Fig. 9 is a top view of fig. 8. Fig. 10 is a front view of the locating pin. Fig. 11 is a schematic cross-sectional view of product molding. Fig. 12 is a schematic diagram of polyurethane foam panel division. FIG. 13 is a schematic view of a heated preform clamping of foam boards. Fig. 14 is a schematic view of an installation between two adjacent products in the prior art. Fig. 15 is a schematic view of the installation of two adjacent products of the present invention.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 3, 4 to 13 and 15, and a method for manufacturing and installing a curved projection screen capable of being quickly disassembled and assembled includes the following steps:
the method comprises the following steps: manufacturing a mould:
the method comprises the following steps: using a low shrinkage resin and a chopped strand mat forming die;
after the two arc female molds 8 are cured, a reinforcing frame 3 is placed on the back 2 of the female molds 8, the reinforcing frame 3 is a field-shaped reinforcing frame 3 formed by vertically and horizontally arranging a plurality of square steel pipes 1, if a part with a local gap exists between the reinforcing frame 3 and the back 2 of the female molds 8, a chopped strand mat is filled, the interior and the surrounding space of the reinforcing frame 3 are filled with a polyether polyol and isocyanate mixture, the surrounding environment temperature is controlled to be 20-25 ℃, the surface is repaired and leveled after the mixture foam is fully cured, and the mixture foam is integrally wrapped by 2 layers of chopped strand mats and low-shrinkage resin;
the first step is: detecting the curved surface of the die and installing a reinforcing frame 3;
after the three-coordinate measuring instrument inspection equipment confirms that the curved surface of the female die 8 meets the requirements, marking the vertex and the midpoint of the overall dimension of the product on the female die 8, and assembling a die frame 11 according to the marked points;
step two: preparing raw materials:
step two, preparing the sandwich foam:
dividing the polyurethane foam board into equal-size trapezoidal foam boards 4, preheating the trapezoidal foam boards 4 in an oven, tightly clamping the trapezoidal foam boards 4 by using a fixture after the trapezoidal foam boards 4 are preheated, putting the trapezoidal foam boards into the oven for continuous heating, taking out the fixture, naturally cooling to room temperature, and taking out the trapezoidal foam boards 4 for later use;
step two: installation of the trapezoidal foam plate 4:
the trapezoidal foam boards 4 are placed into the blank spaces of the die reinforcing frame 3 to be fixed, the reserved gap between the edge of each trapezoidal foam board 4 and the die frame 11 is trimmed to be 5mm, the reserved gap between every two adjacent trapezoidal foam boards 4 is 10mm, the gap between every two adjacent trapezoidal foam boards 4 is filled with the mixture of polyurethane rigid foam combined polyether and isocyanate components, and after the mixture foam is fully cured, redundant foam is removed by taking the trapezoidal foam boards 4 as the standard;
step two and step three: frame reinforcing plate 5 and connecting hole frame 12:
according to mould frame size numerical control processing frame reinforcing plate 5, the size of frame reinforcing plate 5 all is 2mm less than the frame size all around, sets up a plurality of connect the via hole 6 on the frame reinforcing plate 5 along its circumferencial direction, connect the via hole 6 the size be phi 8.60 + 0.1mm, the thickness of the reinforcing plate template 5 is 3 mm;
the connecting hole frame is made of 80X 60X 2mm glass fiber reinforced plastic pultruded pipe by cutting the pultruded pipe into a 30mm thick square frame, placing a polyurethane foam plate with equal thickness in the square frame of the pultruded pipe, bonding a 1mm thick glass fiber reinforced plastic plate with resin to seal the openings at the two sides of the square frame of the pultruded pipe, and machining the phi 8.6 in the center of one 80mm long side0 +0.1mm holes with the depth of 50 mm;
step three: and (3) product molding:
coating a release agent on the female die 8 manufactured in the first step, then laying an outer skin, installing a positioning pin 7 on a die frame 11, fixing a 3mm thick frame reinforcing plate 5 and a connecting hole frame 12 on the positioning pin 7, and filling a gap between the connecting hole frame 12 and the skin with glass fiber;
placing the sandwich foam plate in the step two into a die frame 11, and removing foams at the interference position;
laying an inner skin, closing the male die 13, measuring the air tightness of the die cavity, requiring the vacuum pressure to be less than or equal to-0.08 MPa, closing the vacuum pressure for 30 minutes, reducing the vacuum pressure in the die cavity to be less than 0.01MPa, and performing resin introduction molding after the pressure of the die cavity meets the requirement;
step four: product installation:
processing a plurality of phi 45mm connecting holes on the outer surface of the molded product prepared in the third step, connecting the product by using M8 multiplied by 35mm bolts, covering the phi 45mm holes by using a decorative cover 9, filling the inner surface seams by using nitro-type automobile putty, wherein the ratio of the automobile putty to the curing agent is 5: 1, grinding by using a 240-mesh dry grinder until the inner surface is in smooth transition, checking by using a curvature template, and confirming that the curvature of a joint meets the requirement, thereby finishing the manufacture and installation of the curved surface projection screen.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 5 and 6, and the sectional dimension of the square steel pipe 1 in the first step of the present embodiment is 100 × 50 × 2 mm. So set up, can improve mould camber precision, the radial deformation that the square steel pipe can effectually prevent bed die 8 itself. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 5, the present embodiment will be described, wherein the mixing ratio of the polyether polyol and the isocyanate in the first step of the present embodiment is 1.2: 0.8. By the arrangement, the foam with better strength can be obtained according to the proportion, and the surface is repaired and leveled after the foam of the mixture is fully cured. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: referring to fig. 12 and 13, the trapezoidal foam plate 4 in the second step of the present embodiment is preheated to 70 ℃ for 30 minutes; the trapezoidal foam board 4 was continuously heated at 80 ℃ for 60 minutes. So set up, can make the cystosepiment obtain with the basically unanimous camber of bed die 8, heat 70 ℃ and make the cystosepiment fully soften, heat 80 ℃ and make the cystosepiment internal stress fully release, fixed camber. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 5, the embodiment is described, and the ambient temperature when the mixture is filled into the gap between two adjacent trapezoidal foam boards 4 in the second step of the embodiment is controlled to be 20-25 ℃, and the mixing ratio is 0.9: 1.1. By the arrangement, the foaming material with better toughness can be obtained according to the proportion, and the foaming material with the width of 10mm can be ensured to have enough bonding strength. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
Claims (5)
1. A method for manufacturing and installing a curved surface projection screen capable of being quickly disassembled and assembled is characterized in that: it comprises the following steps:
the method comprises the following steps: manufacturing a mould:
the method comprises the following steps: using a low shrinkage resin and a chopped strand mat forming die;
after the two arc female molds (8) are cured, placing a reinforcing frame (3) on the back (2) of the female molds (8), wherein the reinforcing frame (3) is a field-shaped reinforcing frame (3) formed by vertically and horizontally arranging a plurality of square steel pipes (1), filling a part with a local gap between the reinforcing frame (3) and the back (2) of the female molds (8) with a chopped strand mat, filling the inner part and the surrounding space of the reinforcing frame (3) with a polyether polyol and isocyanate mixture, controlling the surrounding environment temperature to be between 20 and 25 ℃, repairing and flattening the surface after the mixture foaming material is fully cured, and then integrally wrapping the mixture foaming material with 2 layers of chopped strand mats and low-shrinkage resin;
the first step is: detecting the curved surface of the die and installing a reinforcing frame (3);
after the curved surface of the female die (8) is confirmed to meet the requirements by using a three-coordinate measuring instrument inspection device, marking the vertex and the midpoint of the overall dimension of the product on the female die (8), and assembling a die frame (11) according to the marked points;
step two: preparing raw materials:
step two, preparing the sandwich foam:
dividing the polyurethane foam board into equal-size trapezoidal foam boards (4), preheating the trapezoidal foam boards (4) in an oven, tightly clamping the trapezoidal foam boards (4) by using a jig after the trapezoidal foam boards (4) are preheated, putting the trapezoidal foam boards into the oven for continuous heating, taking out the fixture, naturally cooling to room temperature, and taking out the trapezoidal foam boards (4) for later use;
step two: installation of the trapezoidal foam board (4):
the trapezoidal foam boards (4) are placed into the blank spaces of the die reinforcing frame (3) for fixation, the gap between the edge of each trapezoidal foam board (4) and the die frame (11) is trimmed to be 5mm, the gap between every two adjacent trapezoidal foam boards (4) is 10mm, the gap between every two adjacent trapezoidal foam boards (4) is filled with the mixture of the polyurethane rigid foam combined polyether and the isocyanate component, and after the mixture foaming material is fully cured, the trapezoidal foam boards (4) are used as the standard for removing the redundant foaming material;
step two and step three: frame reinforcing plate (5) and connecting hole frame (12):
frame reinforcing plate (5) is processed according to mould frame size numerical control, the size of frame reinforcing plate (5) is all 2mm less than the frame size all around, set up a plurality of connect the via hole (6) on frame reinforcing plate (5) along its outer circumferencial direction, the size of connect the via hole (6) is phi 8.60 +0.1mm, the thickness of the reinforcing plate template (5) is 3 mm;
the connecting hole frame is made of 80X 60X 2mm glass fiber reinforced plastic pultruded pipe by cutting the pultruded pipe into a 30mm thick square frame, placing a polyurethane foam plate with equal thickness in the square frame of the pultruded pipe, bonding a 1mm thick glass fiber reinforced plastic plate with resin to seal the openings at the two sides of the square frame of the pultruded pipe, and machining the phi 8.6 in the center of one 80mm long side0 +0.1mm holes with the depth of 50 mm;
step three: and (3) product molding:
coating a release agent on the male die (8) manufactured in the first step, then laying an outer skin, installing a positioning pin (7) on a die frame (11), fixing a 3mm thick frame reinforcing plate (5) and a connecting hole frame (12) on the positioning pin (7), and filling a gap between the connecting hole frame (12) and the skin with glass fiber;
placing the sandwich foam plate in the step two into a die frame (11), and removing foam at the interference position;
laying an inner skin, then closing a male die (13), measuring the air tightness of a die cavity of the die, requiring the vacuum pressure to be less than or equal to-0.08 MPa, closing the vacuum pressure for 30 minutes, reducing the vacuum pressure in the die cavity to be less than 0.01MPa, and performing resin introduction molding after the pressure of the die cavity meets the requirement;
step four: product installation:
processing a plurality of phi 45mm connecting holes on the outer surface of the molded product prepared in the third step, connecting the product by using M8 multiplied by 35mm bolts, covering the phi 45mm holes by using a decorative cover (9), filling the inner surface seams by using nitro-type automobile putty, wherein the ratio of the automobile putty to the curing agent is 5: 1, grinding by using a 240-mesh dry grinder until the inner surface is in smooth transition, checking by using a curvature template, and confirming that the curvature of a joint meets the requirement, thereby finishing the manufacture and installation of the curved surface projection screen.
2. The method for manufacturing and installing the curved projection screen capable of being quickly disassembled and assembled according to claim 1, wherein the method comprises the following steps: the cross-sectional dimension of the square steel pipe (1) in the first step is 100X 50X 2 mm.
3. The method for manufacturing and installing the curved projection screen capable of being quickly disassembled and assembled as claimed in claim 2, wherein the method comprises the following steps: the mixing ratio of the polyether polyol and the isocyanate in the first step is 1.2: 0.8.
4. The method for manufacturing and installing the curved projection screen capable of being quickly disassembled and assembled as claimed in claim 2, wherein the method comprises the following steps: the preheating temperature of the trapezoidal foam plate (4) in the step one is 70 ℃, and the heating time is 30 minutes; the ladder-shaped foam board (4) is continuously heated at the temperature of 80 ℃ for 60 minutes.
5. The method for manufacturing and installing the curved projection screen capable of being quickly disassembled and assembled according to claim 4, wherein the method comprises the following steps: and in the second step, the ambient temperature is controlled to be 20-25 ℃ when the mixture is filled in the gap between two adjacent trapezoidal foam plates (4), and the mixing ratio is 0.9: 1.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362930.3A CN112606304B (en) | 2020-11-27 | 2020-11-27 | Manufacturing and mounting method of curved surface projection screen capable of being rapidly assembled and disassembled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362930.3A CN112606304B (en) | 2020-11-27 | 2020-11-27 | Manufacturing and mounting method of curved surface projection screen capable of being rapidly assembled and disassembled |
Publications (2)
| Publication Number | Publication Date |
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| CN112606304A true CN112606304A (en) | 2021-04-06 |
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Cited By (1)
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| CN114179396A (en) * | 2021-12-17 | 2022-03-15 | 江西洪都航空工业集团有限责任公司 | Forming method and die suitable for irregular U-shaped composite material foam sandwich structural member |
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| CN112606304B (en) | 2022-05-27 |
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