Forming die for special-shaped net-size autoclave for PBO composite material

Abstract

The invention relates to the technical field of autoclave forming molds, in particular to a special-shaped net-size autoclave forming mold for PBO composite materials, which comprises a forming molded surface, a vacuum system, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump and a vacuum pump, the pressure device is used for providing pressure and exhausting internal redundant gas during product curing molding; the positioning device comprises a positioning strip made of special alloy invar steel, and the positioning device and the shaping molded surface act synergistically, so that a workpiece is positioned through the positioning device when the workpiece is attached to the shaping molded surface for appearance shaping; the demolding device is matched with the positioning device to work and is used for demolding the molded workpiece; according to the device, the positioning part and the demolding part are arranged, so that a part can be formed at a designed position, machining allowance is avoided, the part can be formed in a clear edge mode, and the problems that post-machining difficulty is large, and the part is prone to being damaged and scrapped are perfectly solved.

Description

Technical Field

[0001] The invention relates to the field of autoclave forming dies, and in particular to an autoclave forming dies for special-shaped net-size PBO composite materials. Background Art

[0002] Advanced composite materials are widely used in the aerospace industry due to their good specific strength and specific stiffness, corrosion resistance, and designability. Composite materials with PBO as reinforcement have the advantages of ultra-high strength, ultra-high modulus, ultra-high heat resistance, and ultra-flame retardancy. Their strength and modulus are twice that of Kevlar fiber, and their performance far exceeds that of the widely used carbon fiber. In recent years, the molding technology of PBO reinforced fiber composite materials has become increasingly mature, and PBO composite materials have been increasingly widely used in the aerospace field.

[0003] Post-processing of composite materials is a necessary process from composite material molding to application. Due to the high strength of PBO reinforced fibers, it is difficult to perform operations such as cutting and grinding. At present, there is no complete post-processing solution for PBO composite materials in the industry, which seriously limits the application scope of PBO composite materials. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a hot-pressing tank forming die for PBO composite material with special-shaped net size.

[0005] In a first aspect, the present invention provides a PBO composite material special-shaped net size autoclave forming mold, comprising a forming surface, and further comprising:

[0006] The vacuum system includes a vacuum pipeline, a sealing tape, a vacuum bag, a vacuum auxiliary component and an isolation film, which is used to provide pressure and exhaust excess internal gas during product curing and molding. The vacuum auxiliary component is used to assist the vacuum bag in maintaining air pressure balance during the vacuuming process;

[0007] The temperature control component includes a thermocouple, a feedback control circuit and a temperature-controlled hot air channel. The thermocouple is used to monitor the temperature of the workpiece in real time. The feedback control circuit adjusts the heating power according to the temperature of the workpiece and time. The temperature-controlled hot air channel is used for directional guidance to ensure uniform heating of the entire workpiece.

[0008] A positioning device, including a positioning bar made of special alloy Invar steel, used to fix the workpiece, the positioning device cooperates with the shaping profile to position the workpiece through the positioning device when the workpiece is attached to the shaping profile for shaping;

[0009] A demoulding device, working in conjunction with the positioning device, is used to demould the molded part;

[0010] The PBO composite preform to be processed is laid on the top of the forming surface, and the preform is positioned by a positioning device. The positioning device is made of special alloy Invar steel. The positioning device and the forming surface work together to ensure the forming position and shape of the parts. It is a key component to solve the difficulty of post-processing and provide a benchmark for subsequent assembly of parts.

[0011] The preform is wrapped with a vacuum bag of the vacuum system, so that a uniform pressure is formed during the molding process by evacuating the vacuum bag. The interior of the vacuum pipeline is connected to a negative pressure pump to extract the air between the vacuum bag and the preform, so that a vacuum is formed between the two, thereby providing pressure and exhausting excess gas inside when the product is cured and molded. The sealant and the isolation film tape can seal the vacuum bag, which is conducive to ensuring the vacuum state between the vacuum bag and the preform.

[0012] The vacuum auxiliary component can evenly pull the vacuum bag during the vacuum bag evacuation process, so as to keep the air pressure of the vacuum bag balanced during the vacuum bag evacuation process, which is helpful to avoid the vacuum bag from quickly fitting to the preform under the action of negative pressure at a certain position during the vacuum bag evacuation process, thereby preventing the airflow from passing through, resulting in airflow blockage, and making it impossible to continue the vacuum bag evacuation operation;

[0013] Then the staff put the mold into the autoclave and heat it to the set temperature through the temperature control component. The temperature control component can control the temperature, monitor the temperature of the workpiece in real time through the thermocouple, adjust the heating power according to the temperature and time of the workpiece through the feedback control circuit, and conduct directional guidance through the temperature-controlled hot air channel to ensure that the entire workpiece is heated evenly. The specific temperature depends on the type of composite material and the curing requirements. Under high temperature and high pressure environment, the composite material undergoes a curing reaction to form the desired shape and performance. The curing time is usually 1 to 4 hours, and the specific time depends on the thickness of the material and the curing conditions. After curing is completed, the mold and composite material are cooled to room temperature. The cooling rate and time need to be precisely controlled to avoid thermal stress and deformation. Then use the demolding device to remove the molded parts from the mold, and then clean the mold surface to prepare for the next molding.

[0014] Preferably, the vacuum assist assembly comprises:

[0015] A first screw-shaped connection seat is fixed to the top of the vacuum bag;

[0016] A lifting platform is installed in the space above the shaping surface;

[0017] A second screw-shaped connection seat is fixed to the bottom of the lifting platform;

[0018] A connecting zipper connected and installed between the first screw-shaped connecting seat and the second screw-shaped connecting seat;

[0019] A loosening assembly, installed at the bottom of the lifting platform, used to drive the connecting zipper to close or separate along the track of the connecting zipper;

[0020] In the process of evacuating the vacuum bag and the workpiece, the lifting platform pulls the vacuum bag by connecting the first spiral connection seat and the second spiral connection seat through the zipper. Due to the spiral setting of the first spiral connection seat and the second spiral connection seat and the connecting zipper, the pulling force of the lifting platform on the vacuum bag is spiral, so that the pulling force of the lifting platform on the surface of the vacuum bag is uniform, and the vacuum bag is pulled as a whole, so that in the process of evacuating the vacuum bag and the workpiece, the vacuum bag is pulled, so that the air pressure between the vacuum bag and the workpiece is gradually reduced to form a negative pressure, and the negative pressure pulls the vacuum bag to fit the workpiece, and the pulling force of the lifting platform on the vacuum bag balances the pulling force formed by the negative pressure, so that the vacuum bag has a tendency to fit the surface of the workpiece instead of fitting on the surface of the workpiece, which is beneficial to avoid a certain position of the vacuum bag fitting on the surface of the workpiece, thereby hindering the circulation of airflow, making the vacuuming between the vacuum bag and the workpiece uneven, and making the surface of the workpiece unevenly stressed.

[0021] After the vacuum between the vacuum bag and the workpiece is evacuated to a certain degree, the loosening component opens the connecting zipper, so that the pulling force on the vacuum bag connected to the first spiral connecting seat disappears one by one. Since the loosening component opens the connecting zipper in a spiral shape from the middle, the vacuum bag is spirally attached to the surface of the workpiece from the middle, which is conducive to making the vacuum bag and the workpiece fit evenly and tightly, thereby facilitating uniform pressure on the workpiece and exhausting excess gas.

[0022] Preferably, the loosening assembly comprises:

[0023] A spiral track is fixed to the bottom of the lifting platform and matches the track of the connecting zipper;

[0024] A slider, slidably mounted on the spiral track;

[0025] A pushing block, fixed to the side wall of the slider, used to push the connecting zipper to close or separate;

[0026] A driving mechanism, installed inside the slider, for driving the slider to slide along the spiral track;

[0027] The driving mechanism drives the slider to move along the track of the spiral track, so that the slider can drive the push block to open the connecting zipper from the middle in sequence along the spiral track of the connecting zipper, which is conducive to the vacuum bag to spiral from the middle and gradually lose the pulling force to fit the surface of the workpiece.

[0028] Preferably, the vacuum assist assembly further comprises:

[0029] Four cylinders, the fixed ends of the four cylinders are all fixed to the bottom of the shaping surface base, and the ends of the telescopic rods of the four cylinders jointly drive the lifting platform to move vertically;

[0030] After the four cylinders are started at the same time, the lifting platform can be driven to move vertically through the telescopic rod. After the vacuum bag is evacuated, the four cylinders can be started at the same time to push the lifting platform away from the vacuum bag, which is beneficial to make room for operation and avoid interference with subsequent operations.

[0031] Preferably, the vacuum assist assembly further comprises:

[0032] An airbag is fixed to the bottom of the lifting platform, the airbag is a spiral structure and matches the shape of the spiral track, and is located inside the spiral interval of the spiral track;

[0033] An air pump is fixed on the top of the lifting platform, and the output end of the air pump is fixedly connected to the air bag through a connecting pipe;

[0034] After the air pump is started, the interior of the airbag can be inflated. After the airbag is inflated, it can squeeze the vacuum bag, which is beneficial to squeeze the folds formed in the vacuum bag during the suction process, thereby fully removing the air between the vacuum bag and the workpiece, which is beneficial to fully vacuum suction between the vacuum bag and the workpiece.

[0035] Preferably, the vacuum assist assembly further comprises:

[0036] A plurality of isolation sheets are fixed in an array inside the airbag along the trajectory of the airbag, dividing the interior of the airbag into a plurality of independent air cavities;

[0037] A plurality of solenoid valves are arranged one by one corresponding to the isolation sheets and are respectively fixed on the side walls of the isolation sheets, and are used to connect the air cavities on both sides of the isolation sheets when the solenoid valves are opened;

[0038] A plurality of first pressure sensors are fixed inside each of the air cavities, respectively, and are used to detect the pressure inside the air cavity, and to open the corresponding solenoid valve connected to the next air cavity when the pressure inside the air cavity reaches a specified value;

[0039] The isolation sheet can divide the interior of the airbag into several air cavities. When the air pump inflates the air cavity of the innermost circle so that the air cavity of the innermost circle is filled with air, the vacuum bag is expanded and squeezed until the first pressure sensor detects that the air pressure inside the air cavity of the innermost circle reaches a specified value, and then the solenoid valve is opened to allow the gas inside the air cavity of the innermost circle to flow to the next air cavity, so that the several air cavities are inflated in a spiral shape in sequence when the air pressure reaches the specified value, so that the airbag can be expanded in sequence from the inner circle to the outer circle along the spiral shape to expand and squeeze the vacuum bag, so that the expansion and squeezing of the airbag cooperates with the opening of the connecting zipper, so that the vacuum bag can gradually and tightly fit the workpiece from the inside to the outside, which is beneficial to improve the vacuum effect between the vacuum bag and the workpiece.

[0040] Preferably, the vacuum assist assembly further comprises:

[0041] A first sealing strip is fixed to the edge of the vacuum bag and vertically matches with a second sealing strip arranged around the base of the shaping mold surface;

[0042] When the vacuum bag and the workpiece are evacuated to a negative pressure state, the vacuum bag cannot collapse downward from the top due to the pulling force of the lifting platform on the vacuum bag, so that the vacuum bag generates a pulling force on the edge, and the vacuum bag pulls the first sealing strip closer to the second sealing strip, so that the first sealing strip and the second sealing strip fit more closely, which is beneficial to improve the sealing effect of the vacuum bag.

[0043] Preferably, the vacuum assist assembly further comprises:

[0044] A second pressure sensor is installed on the inner wall of the vacuum bag and is used to detect the air pressure between the vacuum bag and the workpiece. When the air pressure reaches a specified value, the driving mechanism starts to drive the pushing block to push the connecting zipper to separate;

[0045] The second pressure sensor can detect the negative pressure between the vacuum bag and the workpiece. When it is detected that the negative pressure reaches a specified value, the control driving mechanism starts to drive the pushing block to push the connecting zipper to separate. As the connecting zipper is separated and opened, the middle part of the vacuum bag fits the workpiece, reducing the space between the vacuum bag and the workpiece, thereby changing the negative pressure between the vacuum bag and the workpiece. If the negative pressure is lower than the specified value, the control mechanism pauses, thereby suspending the separation and opening of the connecting zipper until the negative pressure returns to the specified value, which helps to avoid the connecting zipper from separating and opening too quickly, resulting in insufficient negative pressure in the vacuum bag during the bonding process, causing the wrinkles on the bonding surface to accommodate air and affect the negative pressure effect.

[0046] Preferably, the vacuum assist assembly further comprises:

[0047] A support block is fixed on the inner wall of the vacuum bag, and the support block is located at a position of the vacuum bag corresponding to a vertical surface of the shaping mold surface;

[0048] A plurality of air guide channels are vertically penetrated and opened on the side wall of the support block in a linear array along the trajectory of the support block to connect the upper and lower end spaces of the support block;

[0049] When the vacuum bag and the vertical surface of the molding surface are fitted together, there is a situation where the vacuum bag fits tightly under the action of negative pressure, which makes it impossible for airflow to pass through, thereby interfering with the formation of negative pressure. Through the setting of the support block, when the vacuum bag and the vertical surface of the molding surface are fitted together, the support block forms a support between the two, so that the airflow can flow through an air guide channel, thereby connecting the upper and lower positions of the vacuum bag and the corresponding positions of the vertical surface of the molding surface, which is conducive to avoiding the situation where the vacuum bag and the vertical surface of the molding surface are fitted together, resulting in the airflow being unable to pass and affecting the negative pressure.

[0050] Preferably, it also includes:

[0051] The shaping surface is a surface made of a sealing metal part, and the entire surface is a whole piece of leather or finely processed after welding, and the surface includes a reserved surface reduction rework margin;

[0052] The forming surface is made of sealed metal parts to ensure the appearance structure of the produced parts. The entire surface is made of a whole piece of leather or finely processed after welding, and a certain amount of surface reduction and repair margin is reserved for easy maintenance.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The present invention enables parts to be formed at the designed position and free from processing allowances by setting positioning components and demoulding components, so that parts can be formed with clean edges, perfectly avoiding the problem of difficult post-processing and easy damage and scrapping of parts.

[0055] 2. The present invention arranges the vacuum auxiliary component so that the vacuum bag is spirally attached to the surface of the workpiece from the middle, which is conducive to making the vacuum bag and the workpiece fit evenly and tightly, thereby facilitating uniform pressure on the workpiece and exhausting excess gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0057] Figure 2 It is a schematic diagram of the installation structure of the shaping surface of the present invention.

[0058] Figure 3 It is a schematic diagram of the structure after the overall section of the present invention.

[0059] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0060] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0061] Figure 6 It is a schematic diagram of the structure inside the vacuum bag of the present invention.

[0062] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at point C in the middle.

[0063] Figure 8 It is a schematic diagram of the structure below the lifting platform of the present invention.

[0064] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at D in the middle.

[0065] In the figure: 1. shaping surface; 2. vacuum system; 201. vacuum bag; 202. first spiral connection seat; 203. lifting platform; 204. second spiral connection seat; 205. connecting zipper; 301. spiral track; 302. slider; 303. push block; 4. cylinder; 5. air bag; 501. air pump; 502. connecting pipe; 6. first sealing strip; 7. support block; 701. air guide channel; 801. temperature-controlled hot air channel; 802. thermocouple; 9. positioning device; 10. demoulding device. DETAILED DESCRIPTION

[0066] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0067] like Figures 1 to 9 The mold for forming a PBO composite material with a special-shaped net size autoclave shown includes a forming surface 1 and also includes:

[0068] The vacuum system 2, including vacuum pipelines, sealing tape, vacuum bag 201, vacuum auxiliary components and isolation film, is used to provide pressure and discharge excess internal gas during product curing and molding. The vacuum auxiliary components are used to assist the vacuum bag 201 in maintaining air pressure balance during vacuuming;

[0069] The temperature control component includes a thermocouple 802, a feedback control circuit and a temperature-controlled hot air channel 801. The thermocouple 802 is used to monitor the temperature of the workpiece in real time. The feedback control circuit adjusts the heating power according to the temperature of the workpiece and time. The temperature-controlled hot air channel 801 is used for directional guidance to ensure uniform heating of the entire workpiece.

[0070] The positioning device 9 includes a positioning bar made of a special alloy Invar steel, which is used to fix the workpiece. The positioning device 9 cooperates with the shaping profile 1 to position the workpiece when it is attached to the shaping profile 1 for shaping.

[0071] The demoulding device 10 cooperates with the positioning device 9 to demould the molded product;

[0072] Post-processing of composite materials is a necessary process from composite material molding to application. Due to the high strength of PBO reinforced fibers, it is difficult to perform operations such as cutting and grinding. At present, there is no perfect post-processing solution for PBO composite materials in the industry, which seriously limits the application scope of PBO composite materials.

[0073] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: the PBO composite material preform to be processed is laid on the top of the shaping surface 1, and the preform is positioned by a positioning device 9. The positioning device is made of a special alloy Invar steel. The positioning device 9 cooperates with the shaping surface 1 to ensure the molding position and shape of the part. It is a key component to solve the difficulty of post-processing and provides a reference for subsequent assembly of parts.

[0074] The preform is wrapped by the vacuum bag 201 of the vacuum system 2, so that a uniform pressure is formed during the molding process by evacuating the vacuum bag 201. The interior of the vacuum pipeline is connected to a negative pressure pump to extract the air between the vacuum bag 201 and the preform, so that a vacuum is formed between the two, thereby providing pressure and exhausting excess gas inside when the product is cured and molded. The sealant and the isolation film tape can seal the vacuum bag 201, which is conducive to ensuring the vacuum state between the vacuum bag 201 and the preform;

[0075] The vacuum auxiliary component can evenly pull the vacuum bag 201 during the process of evacuating the vacuum bag 201, so as to keep the air pressure of the vacuum bag 201 balanced during the process of evacuating the vacuum bag 201, thereby preventing a certain position of the vacuum bag 201 from quickly fitting against the preform under the action of negative pressure during the process of evacuating the vacuum bag 201, thereby preventing the airflow from passing through and causing airflow blockage, so that the vacuum bag 201 cannot continue to evacuate the vacuum bag 201;

[0076] Subsequently, the staff puts the mold into the autoclave and heats it to the set temperature through the temperature control component. The temperature control component can control the temperature, monitors the workpiece temperature in real time through the thermocouple 802, adjusts the heating power according to the workpiece temperature and time through the feedback control circuit, and conducts directional guidance through the temperature-controlled hot air channel 801 to ensure that the entire workpiece is heated evenly. The specific temperature depends on the type of composite material and the curing requirements. Under high temperature and high pressure environment, the composite material undergoes a curing reaction to form the desired shape and properties. The curing time is usually 1 to 4 hours, and the specific time depends on the thickness of the material and the curing conditions. After curing is completed, the mold and composite material are cooled to room temperature. The cooling rate and time need to be precisely controlled to avoid thermal stress and deformation. Subsequently, the demolding device 10 is used to remove the molded part from the mold, and then the mold surface is cleaned to prepare for the next molding.

[0077] As an optional embodiment, the vacuum assist assembly includes:

[0078] The first screw-shaped connection seat 202 is fixed to the top of the vacuum bag 201;

[0079] A lifting platform 203 is installed in the space above the shaping surface 1;

[0080] The second screw-shaped connection seat 204 is fixed to the bottom of the lifting platform 203;

[0081] A connecting zipper 205 is connected and installed between the first screw-shaped connecting seat 202 and the second screw-shaped connecting seat 204;

[0082] A loosening assembly is installed at the bottom of the lifting platform 203 and is used to drive the connecting zipper 205 to close or separate along the track of the connecting zipper 205;

[0083] In the process of evacuating the vacuum bag 201 and the workpiece, the lifting platform 203 pulls the vacuum bag 201 by connecting the first spiral connection seat 202 and the second spiral connection seat 204 through the connection zipper 205. Due to the spiral arrangement of the first spiral connection seat 202, the second spiral connection seat 204 and the connection zipper 205, the pulling force of the lifting platform 203 on the vacuum bag 201 is spiral, so that the pulling force of the lifting platform 203 on the surface of the vacuum bag 201 is uniform, and the vacuum bag 201 is pulled as a whole, so that the vacuum bag 201 and the workpiece are evacuated. During the vacuuming process, since the vacuum bag 201 is pulled, the air pressure between the vacuum bag 201 and the workpiece is gradually reduced to form a negative pressure. The negative pressure pulls the vacuum bag 201 to fit the workpiece, and the pulling force of the lifting platform 203 on the vacuum bag 201 balances the pulling force formed by the negative pressure, so that the vacuum bag 201 has a tendency to fit the surface of the workpiece instead of fitting on the surface of the workpiece, thereby preventing a certain position of the vacuum bag 201 from fitting on the surface of the workpiece, thereby obstructing the circulation of airflow, making the vacuuming between the vacuum bag 201 and the workpiece uneven, and causing uneven force on the surface of the workpiece;

[0084] After the vacuum between the vacuum bag 201 and the workpiece is evacuated to a certain degree, the loosening component opens the connecting zipper 205, so that the pulling force on the vacuum bag 201 connected to the first spiral connecting seat 202 disappears one by one. Since the loosening component opens the connecting zipper 205 in a spiral shape from the middle, the vacuum bag 201 is spirally attached to the surface of the workpiece from the middle, which is conducive to making the vacuum bag 201 and the workpiece fit evenly and tightly, thereby facilitating uniform pressure on the workpiece and exhausting excess gas.

[0085] As an optional embodiment, the loose assembly includes:

[0086] The spiral track 301 is fixed to the bottom of the lifting platform 203 and matches the track of the connecting zipper 205;

[0087] The slider 302 is slidably mounted on the spiral track 301;

[0088] A push block 303 is fixed to the side wall of the slider 302 and is used to push the connecting zipper 205 to close or separate;

[0089] A driving mechanism, installed inside the slider 302, for driving the slider 302 to slide along the spiral track 301;

[0090] The driving mechanism drives the slider 302 to move along the track of the spiral track 301, so that the slider 302 can drive the push block 303 to open the connecting zipper 205 from the middle in sequence along the spiral track of the connecting zipper 205, so that the vacuum bag 201 can gradually lose the pulling force in a spiral shape from the middle and fit the surface of the workpiece;

[0091] It should be noted that the driving mechanism is a mature existing technology and can adopt any structure that can achieve a driving effect. For example, the driving mechanism includes a motor, gears, and racks. After the motor is started, the output shaft drives the gears to rotate, so that the gears roll along the trajectory of the rack meshing with it, thereby driving the motor to move. The motor is installed inside the slider 302 to drive the slider 302 to move. These are all mature existing technologies and will not be elaborated here.

[0092] As an optional embodiment, the vacuum assist assembly further includes:

[0093] Four cylinders 4, the fixed ends of the four cylinders 4 are all fixed to the bottom of the base of the shaping profile 1, and the ends of the telescopic rods of the four cylinders 4 jointly drive the lifting platform 203 to move vertically;

[0094] After the four cylinders 4 are started simultaneously, the lifting platform 203 can be driven to move vertically through the telescopic rod. Therefore, after the vacuum bag 201 is evacuated, the four cylinders 4 can be started simultaneously to push the lifting platform 203 away from the vacuum bag 201, thereby making room for operation and thus avoiding interference with subsequent operations.

[0095] As an optional embodiment, the vacuum assist assembly further includes:

[0096] The airbag 5 is fixed to the bottom of the lifting platform 203. The airbag 5 is a spiral structure and the shape of the airbag 5 matches that of the spiral track 301. The airbag 5 is located inside the spiral interval of the spiral track 301.

[0097] The air pump 501 is fixed on the top of the lifting platform 203, and the output end of the air pump 501 is fixedly connected to the air bag 5 through the connecting pipe 502;

[0098] After the air pump 501 is started, it can inflate the interior of the airbag 5. After the airbag 5 is inflated, it can squeeze the vacuum bag 201, which is beneficial to squeeze the wrinkles formed in the vacuum bag 201 during the suction process, so as to fully remove the air between the vacuum bag 201 and the workpiece, which is beneficial to fully vacuum suction between the vacuum bag 201 and the workpiece.

[0099] As an optional embodiment, the vacuum assist assembly further includes:

[0100] A plurality of isolation sheets are fixed in an array inside the airbag 5 along the trajectory of the airbag 5, so as to divide the inside of the airbag 5 into a plurality of independent air cavities;

[0101] A plurality of solenoid valves are arranged one by one corresponding to the isolation sheets and are fixed on the side walls of the isolation sheets respectively. When the solenoid valves are opened, they are used to connect the air cavities on both sides of the isolation sheets;

[0102] A plurality of first pressure sensors are fixed inside each air cavity, respectively, for detecting the pressure inside the air cavity, and opening the corresponding electromagnetic valve connected to the next air cavity when the pressure inside the air cavity reaches a specified value;

[0103] The isolation sheet can divide the interior of the airbag 5 into several air cavities. When the air pump 501 inflates the air cavity of the innermost circle so that the air cavity of the innermost circle is filled with air, the vacuum bag 201 is expanded and squeezed until the first pressure sensor detects that the air pressure inside the air cavity of the innermost circle reaches a specified value, and then the solenoid valve is opened to allow the gas inside the air cavity of the innermost circle to flow to the next air cavity, so that the several air cavities are inflated in a spiral shape in sequence when the air pressure reaches the specified value, so that the airbag 5 can be expanded in sequence from the inner circle to the outer circle along the spiral shape to expand and squeeze the vacuum bag 201, so that the expansion and squeezing of the airbag 5 cooperates with the opening of the connecting zipper 205, so that the vacuum bag 201 can gradually fit closely to the workpiece from the inside to the outside, which is beneficial to improve the vacuum effect between the vacuum bag 201 and the workpiece.

[0104] As an optional embodiment, the vacuum assist assembly further includes:

[0105] The first sealing strip 6 is fixed to the edge of the vacuum bag 201 and vertically matches with the second sealing strip arranged around the base of the shaping mold surface 1;

[0106] When the vacuum bag 201 and the workpiece are evacuated to a negative pressure state, the vacuum bag 201 cannot collapse downward from the top due to the pulling force of the lifting platform 203 on the vacuum bag 201, so that the vacuum bag 201 generates a pulling force on the edge, and the vacuum bag 201 pulls the first sealing strip 6 closer to the second sealing strip, so that the first sealing strip 6 and the second sealing strip fit more closely, which is beneficial to improve the sealing effect of the vacuum bag 201.

[0107] As an optional embodiment, the vacuum assist assembly further includes:

[0108] The second pressure sensor is installed on the inner wall of the vacuum bag 201 and is used to detect the pressure between the vacuum bag 201 and the workpiece. When the pressure reaches a specified value, the driving mechanism starts to drive the pushing block 303 to push the connecting zipper 205 to separate;

[0109] The second pressure sensor can detect the negative pressure between the vacuum bag 201 and the workpiece. When it is detected that the negative pressure reaches the specified value, the control driving mechanism starts to drive the pushing block 303 to push the connecting zipper 205 to separate. As the connecting zipper 205 is separated and opened, the middle part of the vacuum bag 201 fits the workpiece, reducing the space between it and the workpiece, thereby changing the negative pressure between the vacuum bag 201 and the workpiece. If the negative pressure is lower than the specified value, the control mechanism pauses, thereby suspending the separation and opening of the connecting zipper 205 until the negative pressure returns to the specified value, which helps to avoid the connecting zipper 205 from separating and opening too quickly, resulting in insufficient negative pressure in the vacuum bag 201 during the bonding process, causing the wrinkles on the bonding surface to accommodate air and affect the negative pressure effect.

[0110] As an optional embodiment, the vacuum assist assembly further includes:

[0111] The support block 7 is fixed on the inner wall of the vacuum bag 201, and the support block 7 is located at a position corresponding to the vertical surface of the vacuum bag 201 and the shaping surface 1;

[0112] A plurality of air guide channels 701 are vertically penetrated and opened on the side wall of the support block 7 in a linear array along the trajectory of the support block 7 to connect the upper and lower end spaces of the support block 7;

[0113] When the vacuum bag 201 and the molding surface 1 are fitted together at the positions corresponding to the vertical surfaces thereof, there is a situation where the vacuum bag 201 and the molding surface 1 are fitted together tightly under the action of negative pressure, so that the airflow cannot pass through, thereby interfering with the formation of negative pressure. By setting the support block 7, when the vacuum bag 201 and the molding surface 1 are fitted together at the positions corresponding to the vertical surfaces thereof, the support block 7 forms a support between the two, so that the airflow can flow through the air guide channel 701, thereby connecting the upper and lower positions of the positions corresponding to the vertical surfaces of the vacuum bag 201 and the molding surface 1, thereby helping to avoid the situation where the vacuum bag 201 and the molding surface 1 are fitted together at the positions corresponding to the vertical surfaces thereof, resulting in the airflow being unable to pass through and affecting the negative pressure.

[0114] As an optional embodiment, it also includes:

[0115] The forming surface 1 is a surface made of a sealing metal part, and the entire surface is a whole piece of leather or finely processed after welding, and the surface includes a reserved surface reduction rework margin;

[0116] The forming surface 1 is made of a sealing metal part to ensure the appearance structure of the produced parts. The entire surface is made of a whole piece of leather or finely processed after welding, and a certain amount of surface reduction and repair margin is reserved for easy maintenance.

[0117] The working principle of the present invention is as follows: the PBO composite material preform to be processed is laid on the top of the shaping surface 1, and the preform is positioned by the positioning device 9, which is made of special alloy Invar steel. The positioning device 9 cooperates with the shaping surface 1 to ensure the forming position and shape of the part, and is a key component to solve the difficulty of post-processing and provide a reference for subsequent assembly of parts;

[0118] The preform is wrapped by the vacuum bag 201 of the vacuum system 2, so that a uniform pressure is formed during the molding process by evacuating the vacuum bag 201. The interior of the vacuum pipeline is connected to a negative pressure pump to extract the air between the vacuum bag 201 and the preform, so that a vacuum is formed between the two, thereby providing pressure and exhausting excess gas inside when the product is cured and molded. The sealant and the isolation film tape can seal the vacuum bag 201, which is conducive to ensuring the vacuum state between the vacuum bag 201 and the preform;

[0119] The vacuum auxiliary component can evenly pull the vacuum bag 201 during the process of evacuating the vacuum bag 201, so as to keep the air pressure of the vacuum bag 201 balanced during the process of evacuating the vacuum bag 201, thereby preventing a certain position of the vacuum bag 201 from quickly fitting against the preform under the action of negative pressure during the process of evacuating the vacuum bag 201, thereby preventing the airflow from passing through and causing airflow blockage, so that the vacuum bag 201 cannot continue to evacuate the vacuum bag 201;

[0120] Subsequently, the staff puts the mold into the autoclave and heats it to the set temperature through the temperature control component. The temperature control component can control the temperature, monitors the workpiece temperature in real time through the thermocouple 802, adjusts the heating power according to the workpiece temperature and time through the feedback control circuit, and conducts directional guidance through the temperature-controlled hot air channel 801 to ensure that the entire workpiece is heated evenly. The specific temperature depends on the type of composite material and the curing requirements. Under high temperature and high pressure environment, the composite material undergoes a curing reaction to form the desired shape and properties. The curing time is usually 1 to 4 hours, and the specific time depends on the thickness of the material and the curing conditions. After curing is completed, the mold and composite material are cooled to room temperature. The cooling rate and time need to be precisely controlled to avoid thermal stress and deformation. Subsequently, the demolding device 10 is used to remove the molded part from the mold, and then the mold surface is cleaned to prepare for the next molding.

[0121] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A PBO composite material special-shaped net size autoclave forming die, comprising a forming surface (1), characterized in that: Also includes: A vacuum system (2), comprising a vacuum pipeline, a sealing tape, a vacuum bag (201), a vacuum auxiliary component and an isolation film, for providing pressure and exhausting excess internal gas during product curing and molding, wherein the vacuum auxiliary component is used to assist the vacuum bag (201) in maintaining air pressure balance during the vacuuming process; The temperature control component comprises a thermocouple (802), a feedback control circuit and a temperature-controlled hot air channel (801), wherein the thermocouple (802) is used to monitor the temperature of the workpiece in real time, the feedback control circuit adjusts the heating power according to the temperature of the workpiece and time, and the temperature-controlled hot air channel (801) is used for directional air flow to ensure uniform heating of the entire workpiece; A positioning device (9), comprising a positioning bar made of a special alloy Invar steel, for fixing the workpiece, the positioning device (9) cooperates with the shaping profile (1) so that the workpiece is positioned by the positioning device when it is attached to the shaping profile (1) for shaping; The demoulding device (10) cooperates with the positioning device (9) to demould the molded product.

2. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 1, characterized in that: The vacuum assist assembly comprises: A first screw-shaped connection seat (202) is fixed to the top of the vacuum bag (201); A lifting platform (203) is installed in the space above the shaping surface (1); A second screw-shaped connection seat (204) is fixed to the bottom of the lifting platform (203); A connecting zipper (205) connected and installed between the first screw-shaped connecting seat (202) and the second screw-shaped connecting seat (204); A loosening assembly is installed at the bottom of the lifting platform (203) and is used to drive the connecting zipper (205) to close or separate along the track of the connecting zipper (205).

3. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 2, characterized in that: The loose components include: A spiral track (301) is fixed to the bottom of the lifting platform (203) and matches the track of the connecting zipper (205); A slider (302) is slidably mounted on the spiral track (301); A pushing block (303), fixed to the side wall of the slider (302), used for pushing the connecting zipper (205) to close or separate; A driving mechanism is installed inside the slider (302) and is used to drive the slider (302) to slide along the spiral track (301).

4. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 2, characterized in that: The vacuum assist assembly further comprises: Four cylinders (4), the fixed ends of the four cylinders (4) are all fixed to the bottom of the base of the shaping surface (1), and the ends of the telescopic rods of the four cylinders (4) jointly drive the lifting platform (203) to move vertically.

5. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 3, characterized in that: The vacuum assist assembly further comprises: An airbag (5) is fixed to the bottom of the lifting platform (203), the airbag (5) is a spiral structure and the shape of the airbag (5) matches that of the spiral track (301), and is located inside the spiral interval of the spiral track (301); The air pump (501) is fixed on the top of the lifting platform (203), and the output end of the air pump (501) is fixedly connected to the air bag (5) through a connecting pipe (502).

6. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 5, characterized in that: The vacuum assist assembly further comprises: A plurality of isolation sheets are fixed in an array inside the airbag (5) along the trajectory of the airbag (5), so as to divide the interior of the airbag (5) into a plurality of air cavities that are independent of each other; A plurality of solenoid valves are arranged one by one corresponding to the isolation sheets and are respectively fixed on the side walls of the isolation sheets, and are used to connect the air cavities on both sides of the isolation sheets when the solenoid valves are opened; A plurality of first pressure sensors are respectively fixed inside each of the air cavities and are used to detect the pressure inside the air cavity. When the pressure inside the air cavity reaches a specified value, the corresponding solenoid valve connected to the next air cavity is opened.

7. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 3, characterized in that: The vacuum assist assembly further comprises: The first sealing strip (6) is fixed to the edge of the vacuum bag (201) and vertically matches with the second sealing strip arranged around the base of the shaping mold surface (1).

8. The autoclave forming mold for PBO composite material with special-shaped net size according to claim 5, characterized in that: The vacuum assist assembly further comprises: A second pressure sensor is installed on the inner wall of the vacuum bag (201) and is used to detect the air pressure between the vacuum bag (201) and the workpiece. When the air pressure reaches a specified value, the driving mechanism starts to drive the pushing block (303) to push the connecting zipper (205) to separate.

9. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 8, characterized in that: The vacuum assist assembly further comprises: A support block (7) is fixed on the inner wall of the vacuum bag (201), and the support block (7) is located at a position corresponding to the vertical surface of the vacuum bag (201) and the shaping surface (1); A plurality of air guide channels (701) are vertically penetrated and opened on the side wall of the support block (7) in a linear array along the trajectory of the support block (7) to connect the upper and lower end spaces of the support block (7).

10. The mold for forming a PBO composite material with a special-shaped net size autoclave according to claim 1, characterized in that: Also includes: The shaping surface (1) is a surface made of a sealing metal part, and the entire surface is a whole piece of leather or is finely processed after welding, and the surface includes a reserved surface reduction rework margin.

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