Refined temperature control method and device for fiber resin-based composite material molding process

Abstract

The present invention discloses a method and device for fine temperature control of a fiber resin-based composite material molding process. The method realizes fine temperature control of a composite material molding process through a combined multi-point heating temperature control mold and a temperature control cover. A plurality of independent heating temperature control units are arranged on the bottom surface of the molding mold to control the temperature of the molding mold. The temperature control cover is positioned at a set of combined multi-point heating temperature control mold workstations to control the temperature of the molding mold working environment. The combination of the two can realize fine control of the mold and external temperature, and keep the internal heating and cooling rates of the material consistent, thereby reducing residual stress and suppressing deformation of parts.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber resin-based composite material molding, and in particular to a method and device for achieving refined temperature control in a fiber resin-based composite material molding process through a combined multi-point heating temperature control mold and a temperature control outer cover. Background Art

[0002] With the increasing demand for lightweight, high-strength materials, fiber-reinforced resin-based composites are widely used in various industries. However, during the component molding process, uneven mold thickness and, in some composite molding processes, inconsistent mold heating and cooling rates at room temperature can lead to uneven temperature distribution within the material. This can cause deformation after component demolding, especially for larger or more complex parts. This deformation can pose a safety risk to product quality and may even lead to scrap due to exceeding assembly dimensions.

[0003] For example, the patent specification with announcement number CN206748982U adopts the method of simultaneous cooling from top to bottom to speed up the cooling speed of the parts after molding, and designs the method of using the water inlet pump and the water outlet pump at the same time to speed up the circulation of cooling water. The molding mold has an integral cooling device, but the mold with curved surfaces has uneven thickness of the mold body. If the temperature is not finely controlled, the parts will inevitably produce residual stress during the molding process and cause deformation.

[0004] For example, the patent specification with announcement number CN205668402U discloses a simple temperature-controlled composite material mold. Although it can provide uniform and stable heating conditions for composite material vacuum-assisted resin transfer molding and hand lay-up process molding, it can only adopt rough control of the mold temperature, without fine temperature control, and does not consider the influence of the spatial ambient temperature on the mold temperature. It cannot achieve the requirement of maintaining a uniform and constant temperature during the molding process. Therefore, the curing deformation of large-sized or curved composite parts may still be reduced.

[0005] During the molding process of fiber-resin-based composite materials, the uneven distribution of the material's internal temperature field inevitably causes residual stress and deformation defects in components. Significant defects can affect product quality and even lead to scrap due to exceeding assembly dimensions. Therefore, this paper proposes a process and apparatus that reduces component deformation through precise temperature control. Summary of the Invention

[0006] In response to the above-mentioned technical problems and the shortcomings in the field, the present invention provides a method and device for controlling the refined temperature of the composite material molding process through a combined multi-point heating temperature control mold and a temperature control cover, so that the heating and cooling rates inside the material remain consistent, thereby suppressing the deformation of parts.

[0007] A refined temperature control device for a fiber resin-based composite material molding process, comprising a combined multi-point heating temperature control mold;

[0008] The combined multi-point heating and temperature control mold includes a forming mold with a built-in heating oil pipe and multiple heating and temperature control units distributed throughout the bottom of the forming mold and independently controlled;

[0009] The heating temperature control unit includes:

[0010] The heating temperature control plate has a cooling channel in the cavity formed by the heating temperature control plate, and the cooling channel extends out of the heating temperature control plate through the cooling channel inlet and the cooling channel outlet; the heating temperature control plate has a thermocouple through hole running through it from top to bottom, so that the thermocouple can pass through to measure the temperature of the corresponding area of ​​the forming mold above it;

[0011] The heating element provided on the top surface of the heating temperature control plate and electrically connected to the heating element socket provided on the bottom surface of the heating temperature control plate is used to assist in heating the corresponding area of ​​the forming mold above it.

[0012] Preferably, a heat insulation board is provided on the bottom surface of the heating temperature control board, and the heating element socket is provided on the bottom surface of the heat insulation board.

[0013] Preferably, a side surface of the heating temperature control plate is provided with a cooling channel opening communicating with the cooling channel and a cooling channel end face seal that can be sealed with the cooling channel opening.

[0014] Preferably, the combined multi-point heating and temperature control mold further includes a base arranged below the heating and temperature control unit and surrounded by a mold end plate, a mold side plate and a mold bottom sealing plate.

[0015] Preferably, side pads and middle pads are provided in the base for supporting the heating and temperature control unit and the forming mold.

[0016] Preferably, the refined temperature control device for the fiber resin-based composite material molding process further comprises a temperature control cover;

[0017] The temperature control cover includes an outer cover frame, the inner top surface of which is covered with an air temperature control module composed of multiple hot and cold air atomizing and shaping devices, and end sealing plates that can be pulled up to open and lowered to close are respectively provided on both end surfaces, and side temperature control ports with adjustable openings are provided on both side surfaces;

[0018] The hot and cold air atomizing shaping device comprises a housing with a flat bottom air plate, a concave air plate provided inside the housing, a cold air atomizing blowing port and a hot air atomizing blowing port provided on the top surface of the housing, the cold air atomizing blowing port and the hot air atomizing blowing port passing upward through the top surface of the outer frame of the housing to form hot and cold air outlets;

[0019] A temperature sensing probe corresponding to the hot and cold air atomizing shaping device is provided inside the outer frame of the outer cover to measure the temperature of different areas inside the temperature-controlled outer cover.

[0020] Preferably, the refined temperature control device for the fiber resin-based composite material molding process further comprises a frame capable of placing two combined multi-point heating temperature control molds, and the frame is provided with a guide rail;

[0021] The bottom ends of both sides of the outer frame of the outer cover are sliders that match the guide rails. The temperature-controlled outer cover can move on the frame along the guide rails through the sliders and be positioned in one of the combined multi-point heating temperature-controlled mold stations.

[0022] The present invention also provides a refined temperature control method for a fiber resin-based composite material molding process, which uses a refined temperature control device for a fiber resin-based composite material molding process having a combined multi-point heating temperature control mold and a temperature control cover, comprising:

[0023] 1) Determine which stage the composite material is in: heating, insulation, or cooling:

[0024] Collect the temperature of the corresponding areas of each heating temperature control unit and each hot and cold air atomization shaping device at a certain moment, and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design Take the difference and get ΔT max , ΔT min and the minimum temperature difference ΔT with the input design _ min Comparison, minimum temperature difference ΔT design _ min is a positive value;

[0025] If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage;

[0026] If ΔT max ≤0 and |ΔT max |≤|ΔT min |≤ΔTdesign _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min >0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage;

[0027] If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage;

[0028] 2) If it is determined to be in the heating stage:

[0029] The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、 Where T i Indicates the temperature of the area corresponding to the heating temperature control unit, i is the area number corresponding to the heating temperature control unit, represents the temperature of the corresponding area of ​​the hot and cold air atomizing and shaping device, and j is the number of the corresponding area of ​​the hot and cold air atomizing and shaping device;

[0030] If the temperature difference ΔT i 、 When the temperature difference is less than or equal to the set minimum temperature difference, the heating element in the heating temperature control unit keeps heating, the cooling channel is closed, and the hot and cold air atomizing and shaping device keeps blowing hot air;

[0031] If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomization shaping device corresponding to the higher temperature area stops blowing hot air;

[0032] 3) If it is determined to be in the insulation stage:

[0033] Take T min 、T design The smaller value is used as the reference value to compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、

[0034] If the temperature difference ΔT i 、 Less than or equal to the set minimum temperature difference, keep the heating element in the heating temperature control unit in the working state at the last sampling moment, the cooling channel open and close state, and the hot and cold air atomization shaping device in the working state at the last sampling moment;

[0035] If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomization shaping device corresponding to the higher temperature area stops blowing hot air;

[0036] 4) If it is determined to be in the cooling stage:

[0037] The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、

[0038] If the temperature difference ΔT i 、 When the temperature difference is less than or equal to the set minimum temperature difference, the heating element in the heating temperature control unit stops heating, the cooling channel opens, and the hot and cold air atomization shaping device keeps blowing cold air;

[0039] If the temperature difference ΔT i 、 If the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the lower temperature area stops heating, the cooling channel is closed, and the hot and cold air atomizing shaping device corresponding to the lower temperature area stops blowing cold air.

[0040] The present invention also provides a refined temperature control method for a fiber resin-based composite material molding process, which uses a refined temperature control device for a fiber resin-based composite material molding process having only a combined multi-point heating temperature control mold, comprising:

[0041] 1) Determine which stage the composite material is in: heating, insulation, or cooling:

[0042] Collect the temperature of the corresponding area of ​​each heating temperature control unit at a certain moment and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design Take the difference and get ΔT max, ΔT min and the minimum temperature difference ΔT with the input design _ min Comparison, minimum temperature difference ΔT design _ min is a positive value;

[0043] If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage;

[0044] If ΔT max ≤0 and |ΔT max |≤|ΔT min |≤ΔT design _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min >0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage;

[0045] If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage;

[0046] 2) If it is determined to be in the heating stage:

[0047] The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i , where T i Indicates the temperature of the area corresponding to the heating temperature control unit, and i is the area number corresponding to the heating temperature control unit;

[0048] If the temperature difference ΔT iIf the temperature difference is less than or equal to the set minimum temperature difference, the heating element in the heating temperature control unit will keep heating and the cooling channel will be closed;

[0049] If the temperature difference ΔT i When the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the higher temperature area stops heating and the cooling channel opens;

[0050] 3) If it is determined to be in the insulation stage:

[0051] Take T min 、T design The smaller value is used as the reference value to compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ;

[0052] If the temperature difference ΔT i Less than or equal to the set minimum temperature difference, keep the heating element in the heating temperature control unit in the working state at the last sampling moment and the cooling channel open and closed state;

[0053] If the temperature difference ΔT i When the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the higher temperature area stops heating and the cooling channel opens;

[0054] 4) If it is determined to be in the cooling stage:

[0055] The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ;

[0056] If the temperature difference ΔT i When the temperature difference is less than or equal to the set minimum temperature difference, the heating element in the heating temperature control unit stops heating and the cooling channel opens;

[0057] If the temperature difference ΔT i If the temperature difference is greater than the set minimum, the heating element in the heating temperature control unit corresponding to the lower temperature area stops heating and the cooling channel is closed.

[0058] The heating and temperature control unit in the combined multi-point heating and temperature control mold of the present invention and the hot and cold air atomizing and shaping device in the temperature control cover have independent heating and cooling temperature control functions. The temperature difference between the mold area and the working environment is measured by thermocouples and temperature sensing probes. By opening or closing the cooling channel in the heating and temperature control unit and the hot and cold air outlets in the hot and cold air atomizing and shaping device, the mold and the working environment can be synchronously and evenly controlled to heat up or cool down, avoiding uneven temperature distribution inside the composite material, thereby reducing residual stress and suppressing deformation of parts.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] Due to the uneven thickness of the molding mold or the large number of curved surfaces of the parts, the internal temperature distribution of the fiber resin-based composite material is inconsistent during the molding process, and there will be residual stress inside the parts and the parts themselves will deform. Excessive residual stress will reduce the quality of the parts, and excessive deformation may exceed the assembly requirements and lead to scrap.

[0061] The present invention proposes a method for achieving refined temperature control in a composite material molding process by using a combined multi-point heating temperature control mold and a temperature control cover. A plurality of independent heating and temperature control units are arranged on the bottom surface of the molding mold to control the temperature of the molding mold. The temperature control cover is positioned at a set of combined multi-point heating temperature control mold workstations to control the temperature of the molding mold working environment. The combination of the two can achieve refined control of the mold and external temperature, and keep the internal heating and cooling rates of the material consistent, thereby reducing residual stress and suppressing component deformation.

[0062] By combining different numbers of heating and temperature control units based on the actual mold size, they form a mold heating and temperature control module, enabling refined mold temperature control and modularized batching and reuse of heating and temperature control units, significantly reducing mold manufacturing costs. Installing a heating and temperature control module at the bottom of the mold is suitable for various fiber-resin-based composite material preparation processes, such as resin transfer molding, vacuum-assisted molding, and compression molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 Schematic diagram of the combined multi-point heating temperature control mold and the temperature control cover in the rack position of the embodiment;

[0064] Figure 2 This is a schematic diagram of the mold structure of the combined multi-point heating temperature control module of the embodiment;

[0065] Figure 3 This is a schematic diagram of the temperature control cover structure of an embodiment;

[0066] Figure 4 、 Figure 5 This is a schematic structural diagram of a single heating and temperature control unit in an embodiment;

[0067] Figure 6 Schematic diagram of the structure of the hot and cold air atomization shaping device of the embodiment. DETAILED DESCRIPTION

[0068] The present invention will be further described below in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are intended to illustrate the present invention and are not intended to limit the scope of the invention. The operating methods in the following examples where no specific conditions are specified are generally performed under conventional conditions or as recommended by the manufacturer.

[0069] A refined temperature control device for fiber resin matrix composite material molding process, such as Figure 1 As shown, it includes a combined multi-point heating and temperature-controlled mold 2, a temperature-controlled outer cover 3, a frame 1 that can accommodate two combined multi-point heating and temperature-controlled molds 2, and a guide rail 4 on the frame 1. Two sets of combined multi-point heating and temperature-controlled molds 2 serve as two production stations: one mold is used for composite material curing and molding, and the other mold is used for material laying to improve production efficiency.

[0070] like Figure 2 As shown, the combined multi-point heating and temperature control mold 2 includes a forming mold 201 with a heating oil pipe and a plurality of heating and temperature control units 202 distributed throughout the bottom of the forming mold 201 and independently controlled.

[0071] like Figure 4 、 Figure 5 As shown, the heating temperature control unit 202 includes:

[0072] The heating temperature control plate 405 has a cooling channel in the cavity formed by the heating temperature control plate 405. The cooling channel extends out of the heating temperature control plate 405 through a cooling channel inlet 407 and a cooling channel outlet 408. The heating temperature control plate 405 has a thermocouple through hole 409 extending therethrough, through which a thermocouple can pass to measure the temperature of the corresponding area of ​​the forming mold 2 above it.

[0073] The heating element 404 disposed on the top surface of the heating temperature control plate 405 and electrically connected to the heating element socket 411 disposed on the bottom surface of the heating temperature control plate 405 is used to assist in heating the corresponding area of ​​the forming mold 2 thereon.

[0074] A heat insulation board 410 is provided on the bottom surface of the heating temperature control board 405 , and a heating element socket 411 is provided on the bottom surface of the heat insulation board.

[0075] A cooling channel opening communicating with the cooling channel and a cooling channel end face seal 406 capable of sealingly cooperating with the cooling channel opening are provided on the side of the heating temperature control plate 405 .

[0076] like Figure 2 As shown, the combined multi-point heating and temperature control mold 2 also includes a base arranged below the heating and temperature control unit 202 and surrounded by a mold end plate 205, a mold side plate 204 and a mold bottom sealing plate 206;

[0077] The base is provided with side pads 207 and a middle pad 208 for supporting the heating and temperature control unit 202 and the forming mold 201 .

[0078] like Figure 3 As shown, the temperature-controlled outer cover 3 includes an outer cover frame 301, and the inner top surface of the outer cover frame 301 is covered with an air temperature control module 303 composed of multiple hot and cold air atomizing and shaping devices 501. The two end faces are respectively provided with end face sealing plates 304 that can be pulled up to open and lowered to close, and the two side faces are provided with side temperature control ports 306 with adjustable openings.

[0079] like Figure 6 As shown, the cold and hot air atomization shaping device 501 includes a shell with a flat bottom air plate 504, a concave air plate 505 is provided inside the shell, and a cold air atomization blowing port 502 and a hot air atomization blowing port 503 are pierced through the top surface of the shell. The cold air atomization blowing port 502 and the hot air atomization blowing port 503 pass upward through the top surface of the outer cover frame 301 to form a cold and hot air outlet 307.

[0080] A temperature sensing probe corresponding to the hot and cold air atomizing and shaping device 501 is provided in the outer frame 301 of the outer cover, and is used to measure the temperature of different areas in the temperature-controlled outer cover 3 .

[0081] like Figure 1 、 Figure 3 As shown, the bottom ends of both sides of the outer cover frame 301 are sliders 305 that cooperate with the guide rails 4. The temperature-controlled outer cover 3 can be moved on the frame 1 along the guide rails 4 through the sliders 305 and positioned at one of the combined multi-point heating temperature-controlled mold 2 stations.

[0082] Further explanation:

[0083] The multi-point heating and temperature control units 202 in the modular multi-point heating and temperature control mold 2 are located on the bottom surface of the forming mold 201. Depending on the actual size of the forming mold, a different number of heating and temperature control units 202 (e.g., 50) can be combined to form a mold heating and temperature control module. Each heating and temperature control unit 202 has independent heating and cooling control functions. The cooling temperature is 3 to 50°C lower than the set mold temperature to prevent drastic temperature fluctuations.

[0084] The combined multi-point heating and temperature-controlled mold 2 has multiple side pads 207 at the bottom and side positions, and multiple middle pads 208 at the end and middle positions. The pads are used to bear the weight of the mold and support the bottom of the mold to form a frame space, thereby reducing the weight of the mold, facilitating the arrangement of the mold heating and cooling pipelines, and fixing the side panels and short panels.

[0085] The heating temperature control plate 405 is made of a material that is easy to conduct heat (such as copper alloy or aluminum alloy). A heating element 404 is provided on the heating temperature control plate 405 near the bottom surface of the upper forming mold 201 (i.e., the top surface of the heating temperature control plate 405). The heating element 404 is connected to the heating element socket 411 to implement electrical heating of the heating temperature control plate 405. Each heating element 404 is independently controlled.

[0086] The other side of the heating temperature control plate 405 in the heating temperature control unit 202 is provided with a heat insulation plate 410 to reduce heat loss.

[0087] The outer housing frame 301 is insulated with thermal insulation. Temperature sensors (e.g., up to 10 sensors can be installed, with each sensor corresponding to two adjacent hot and cold air atomization and shaping devices 501) are integrated with mold temperature measurement and control to achieve synchronized heating and cooling. Furthermore, by coordinating the opening and closing of the side temperature control ports 306, the hot and cold air atomization and shaping devices 501 in the air temperature control module 303 can regulate the local air heating temperature within the temperature-controlled outer housing 3.

[0088] In the hot and cold air atomizing and shaping device 501, part of the air blown out from the hot and cold air atomizing mouth is blown out through the tiny air holes of the concave air plate 505, and the other part is blown out along the arc surface of the concave air plate 505. Further air volume is blown out through the micropores of the flat-bottom air plate 504 to form a uniform square air outlet.

[0089] The refined temperature control device for fiber resin-based composite material molding process is used to implement a refined temperature control method for fiber resin-based composite material molding process, which is used in vacuum-assisted molding process. The control logic specifically includes:

[0090] 1) Determine which stage the composite material is in: heating, insulation, or cooling:

[0091] Collect the temperature of the corresponding area of ​​each heating temperature control unit 202 and each hot and cold air atomizing shaping device 501 at a certain moment (the collection frequency can be 2 minutes / time), and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design (For example, 120℃) calculate the difference to get ΔT max , ΔT min and the minimum temperature difference ΔT with the input design _ min (such as 5℃), the minimum temperature difference ΔT design _ min is a positive value;

[0092] If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage;

[0093] If ΔT max ≤0 and |ΔT max|≤|ΔT min |≤ΔT design _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min >0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage;

[0094] If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage;

[0095] 2) If it is determined to be in the heating stage:

[0096] The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、 Where T i represents the temperature of the area corresponding to the heating and temperature control unit 202, i is the area number corresponding to the heating and temperature control unit 202, represents the temperature of the area corresponding to the hot and cold air atomizing and shaping device 501, and j is the number of the area corresponding to the hot and cold air atomizing and shaping device 501;

[0097] If the temperature difference ΔT i 、 If the temperature difference is less than or equal to the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 keeps heating, the cooling channel is closed, and the hot and cold air atomizing and shaping device 501 keeps blowing hot air;

[0098] If the temperature difference ΔT i 、 If the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device 501 corresponding to the higher temperature area stops blowing hot air;

[0099] 3) If it is determined to be in the insulation stage:

[0100] Take Tmin 、T design The smaller value is used as the reference value to compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、

[0101] If the temperature difference ΔT i 、 Less than or equal to the set minimum temperature difference, keep the heating element 404 in the heating temperature control unit 202 in the working state at the last sampling moment, the cooling channel open / close state, and the hot / cold air atomizing and shaping device 501 in the working state at the last sampling moment;

[0102] If the temperature difference ΔT i 、 If the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device 501 corresponding to the higher temperature area stops blowing hot air;

[0103] 4) If it is determined to be in the cooling stage:

[0104] The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、

[0105] If the temperature difference ΔT i 、 When the temperature difference is less than or equal to the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device 501 keeps blowing cold air;

[0106] If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating temperature control unit 202 corresponding to the lower temperature area stops heating, the cooling channel is closed, and the hot and cold air atomizing and shaping device 501 corresponding to the lower temperature area stops blowing cold air.

[0107] After it drops to the set temperature, demould.

[0108] The refined temperature control device for the fiber resin-based composite material molding process of the present invention can also be used in a compression molding process. The process of the compression molding process is roughly as follows: the mold is divided into an upper mold and a lower mold, wherein the lower mold is fixed, namely the molding mold 2, and the upper mold moves toward the fixed lower mold until the set pressure is reached. At this time, the refined temperature control device for the fiber resin-based composite material molding process can be designed to use only a combined multi-point heating temperature control mold 2 for precise temperature control, without designing a temperature control cover 3. The control logic of the refined temperature control method for the fiber resin-based composite material molding process can refer to the above-mentioned control logic for the vacuum-assisted molding process. The only difference is that there is no need to monitor the temperature of the corresponding area of ​​the hot and cold air atomizing shaping device 501. And the temperature difference associated therewith, there is no need to control the operation of the cold and hot air atomizing and shaping device 501.

[0109] Specifically include:

[0110] 1) Determine which stage the composite material is in: heating, insulation, or cooling:

[0111] Collect the temperature of the corresponding area of ​​each heating temperature control unit 202 at a certain moment (the collection frequency can be 2 minutes / time), and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design (For example, 80℃) calculate the difference to get ΔT max , ΔT min and the minimum temperature difference ΔT with the input design _ min (such as 5℃), the minimum temperature difference ΔT design _ min is a positive value;

[0112] If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage;

[0113] If ΔT max ≤0 and |ΔT max |≤|ΔT min |≤ΔT design _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min>0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage;

[0114] If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage;

[0115] 2) If it is determined to be in the heating stage:

[0116] The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i , where T i represents the temperature of the area corresponding to the heating and temperature control unit 202, and i is the area number corresponding to the heating and temperature control unit 202;

[0117] If the temperature difference ΔT i If the temperature difference is less than or equal to the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 keeps heating and the cooling channel is closed;

[0118] If the temperature difference ΔT i If the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 corresponding to the higher temperature area stops heating and the cooling channel opens;

[0119] 3) If it is determined to be in the insulation stage:

[0120] Take T min 、T design The smaller value is used as the reference value to compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ;

[0121] If the temperature difference ΔT i The temperature difference is less than or equal to the set minimum temperature difference, and the heating element 404 in the heating temperature control unit 202 is kept in the working state and the cooling channel is opened or closed at the last sampling moment;

[0122] If the temperature difference ΔT i If the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 corresponding to the higher temperature area stops heating and the cooling channel opens;

[0123] 4) If it is determined to be in the cooling stage:

[0124] The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ;

[0125] If the temperature difference ΔT i If the temperature difference is less than or equal to the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 stops heating and the cooling channel opens;

[0126] If the temperature difference ΔT i If the temperature difference is greater than the set minimum temperature difference, the heating element 404 in the heating and temperature control unit 202 corresponding to the lower temperature area stops heating and the cooling channel is closed.

[0127] After the temperature drops to the set temperature, release the pressure and demould.

[0128] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A refined temperature control device for fiber resin-based composite material molding process, characterized in that: It includes a combined multi-point heating temperature control mold (2); The combined multi-point heating and temperature-controlled mold (2) comprises a molding mold (201) with a built-in heating oil pipe and a plurality of heating and temperature-controlled units (202) distributed throughout the bottom of the molding mold (201) and independently controlled. The heating temperature control unit (202) includes: The heating temperature control plate (405) has a cooling channel in the cavity formed by the heating temperature control plate (405), and the cooling channel extends out of the heating temperature control plate (405) through a cooling channel inlet (407) and a cooling channel outlet (408); the heating temperature control plate (405) has a thermocouple through hole (409) extending therethrough, which allows a thermocouple to pass through and measure the temperature of a corresponding area of ​​the molding die above the heating temperature control plate (405); A heating element (404) provided on the top surface of the heating temperature control plate (405) and electrically connected to a heating element socket (411) provided on the bottom surface of the heating temperature control plate (405) is used to assist in heating a corresponding area of ​​the forming mold above it; The refined temperature control device for the fiber resin-based composite material molding process further includes a temperature control outer cover (3); The temperature-controlled outer cover (3) includes an outer cover frame (301), the inner top surface of the outer cover frame (301) is covered with an air temperature control module (303) composed of a plurality of hot and cold air atomizing and shaping devices (501), end sealing plates (304) that can be pulled up to open and lowered to close are respectively provided on both end surfaces, and side temperature control ports (306) with adjustable openings are provided on both side surfaces; The cold and hot air atomizing and shaping device (501) comprises a shell having a flat bottom air plate (504) on the bottom, a concave air plate (505) provided inside the shell, a cold air atomizing blow port (502) and a hot air atomizing blow port (503) provided on the top surface of the shell, the cold air atomizing blow port (502) and the hot air atomizing blow port (503) passing upward through the top surface of the outer cover frame (301) to form a cold and hot air outlet (307); A temperature sensing probe corresponding to the hot and cold air atomizing and shaping device (501) is provided in the outer frame (301) of the outer cover and is used to measure the temperature of different areas in the temperature-controlled outer cover (3).

2. The refined temperature control device for fiber resin-based composite material molding process according to claim 1 is characterized in that: A heat insulation board (410) is provided on the bottom surface of the heating temperature control board (405), and a heating element socket (411) is provided on the bottom surface of the heat insulation board (410); A cooling channel opening communicating with the cooling channel and a cooling channel end face seal (406) capable of sealingly cooperating with the cooling channel opening are provided on the side surface of the heating temperature control plate (405).

3. The refined temperature control device for fiber resin-based composite material molding process according to claim 1 or 2, characterized in that: The combined multi-point heating and temperature-controlled mold (2) further comprises a base arranged below the heating and temperature-controlled unit (202) and surrounded by a mold end plate (205), a mold side plate (204) and a mold bottom sealing plate (206); The base is provided with side pads (207) and a middle pad (208) for supporting the heating and temperature control unit (202) and the forming mold (201).

4. The refined temperature control device for fiber resin-based composite material molding process according to claim 1, characterized in that: The refined temperature control device for the fiber resin-based composite material molding process further comprises a frame (1) capable of accommodating two combined multi-point heating temperature control molds (2), wherein the frame (1) is provided with a guide rail (4); The bottom ends of both sides of the outer cover frame (301) are sliders (305) that match the guide rails (4). The temperature control outer cover (3) can be moved on the frame (1) along the guide rails (4) through the sliders (305) and positioned at one of the combined multi-point heating temperature control mold (2) stations.

5. A refined temperature control method for a fiber resin-based composite material molding process, characterized in that: The refined temperature control device for a fiber resin-based composite material molding process according to any one of claims 1 to 4 comprises: 1) Determine which stage the composite material is in: heating, insulation, or cooling: Collect the temperature of the corresponding areas of each heating temperature control unit (202) and each hot and cold air atomizing and shaping device (501) at a certain moment, and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design Take the difference and get ΔT max , ΔT min and the minimum temperature difference ΔT with the input design _ min Comparison, minimum temperature difference ΔT design _ min is a positive value; If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage; If ΔT max ≤0 and |ΔT max |≤|ΔT min |≤ΔT design _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min >0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage; If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage; 2) If it is determined to be in the heating stage: The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、 Where T i represents the temperature of the area corresponding to the heating temperature control unit (202), i is the area number corresponding to the heating temperature control unit (202), represents the temperature of the corresponding area of ​​the hot and cold air atomizing and shaping device (501), and j is the number of the corresponding area of ​​the hot and cold air atomizing and shaping device (501); If the temperature difference ΔT i 、 When the temperature difference is less than or equal to the set minimum temperature difference, the heating element (404) in the heating temperature control unit (202) keeps heating, the cooling channel is closed, and the hot and cold air atomizing and shaping device (501) keeps blowing hot air; If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device (501) corresponding to the higher temperature area stops blowing hot air; 3) If it is determined to be in the insulation stage: Take T min 、T design The smaller value is used as the reference value to compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、 If the temperature difference ΔT i 、 The temperature difference is less than or equal to the set minimum temperature difference, and the heating element (404) in the heating temperature control unit (202) is kept in the working state at the last sampling moment, the cooling channel is opened and closed, and the hot and cold air atomizing and shaping device (501) is kept in the working state at the last sampling moment; If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the higher temperature area stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device (501) corresponding to the higher temperature area stops blowing hot air; 4) If it is determined to be in the cooling stage: The minimum temperature T min As a reference value, compare all temperatures T i 、 Compared with the reference value, the temperature difference ΔT of each area is obtained i 、 If the temperature difference ΔT i 、 When the temperature difference is less than or equal to the set minimum temperature difference, the heating element (404) in the heating temperature control unit (202) stops heating, the cooling channel opens, and the hot and cold air atomizing and shaping device (501) keeps blowing cold air; If the temperature difference ΔT i 、 When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the lower temperature area stops heating, the cooling channel is closed, and the hot and cold air atomizing and shaping device (501) corresponding to the lower temperature area stops blowing cold air.

6. A refined temperature control method for a fiber resin-based composite material molding process, characterized in that: A refined temperature control device for a fiber resin-based composite material molding process is used, the refined temperature control device for a fiber resin-based composite material molding process comprising a combined multi-point heating temperature control mold (2), the combined multi-point heating temperature control mold (2) comprising a molding mold (201) with a heating oil pipe and a plurality of heating temperature control units (202) distributed throughout the bottom of the molding mold (201) and independently controlled. The heating temperature control unit (202) includes: The heating temperature control plate (405) has a cooling channel in the cavity formed by the heating temperature control plate (405), and the cooling channel extends out of the heating temperature control plate (405) through a cooling channel inlet (407) and a cooling channel outlet (408); the heating temperature control plate (405) has a thermocouple through hole (409) extending therethrough, which allows a thermocouple to pass through and measure the temperature of a corresponding area of ​​the molding die above the heating temperature control plate (405); A heating element (404) provided on the top surface of the heating temperature control plate (405) and electrically connected to a heating element socket (411) provided on the bottom surface of the heating temperature control plate (405) is used to assist in heating a corresponding area of ​​the forming mold above it; The refined temperature control method for the fiber resin-based composite material molding process includes: 1) Determine which stage the composite material is in: heating, insulation, or cooling: Collect the temperature of the corresponding area of ​​each heating temperature control unit (202) at a certain moment and record the maximum temperature T max and minimum temperature T min , and the input target temperature T design Take the difference and get ΔT max , ΔT min and the minimum temperature difference ΔT with the input design _ min Comparison, minimum temperature difference ΔT design _ min is a positive value; If ΔT max ≤0 and ΔT design _ min <|ΔT max |≤|ΔT min |, or, ΔT max >0 and ΔT min <-ΔT design _ min , it is defined as the heating stage; If ΔT max ≤0 and |ΔT max |≤|ΔT min |≤ΔT design _ min , or, ΔT max >0 and -ΔT design _ min ≤ΔT min ≤0, or ΔT min >0 and ΔT min ≤ΔT max ≤ΔT design _ min , it is defined as the insulation stage; If ΔT min ≥0 and ΔT max ≥ΔT min >ΔT design _ min , or, ΔT min <0 and ΔT max >ΔT design _ min It is defined as the cooling stage; 2) If it is determined to be in the heating stage: The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i , where T i represents the temperature of the area corresponding to the heating temperature control unit (202), and i is the area number corresponding to the heating temperature control unit (202); If the temperature difference ΔT i When the temperature difference is less than or equal to the set minimum temperature difference, the heating element (404) in the heating temperature control unit (202) keeps heating and the cooling channel is closed; If the temperature difference ΔT i When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the higher temperature area stops heating and the cooling channel opens; 3) If it is determined to be in the insulation stage: Take T min 、T design The smaller value is used as the reference value to compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ; If the temperature difference ΔT i The temperature difference is less than or equal to the set minimum temperature difference, and the heating element (404) in the heating temperature control unit (202) is kept in the working state and the cooling channel is opened or closed at the last sampling moment; If the temperature difference ΔT i When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the higher temperature area stops heating and the cooling channel opens; 4) If it is determined to be in the cooling stage: The minimum temperature T min As a reference value, compare all temperatures T i Compared with the reference value, the temperature difference ΔT of each area is obtained i ; If the temperature difference ΔT i When the temperature difference is less than or equal to the set minimum temperature difference, the heating element (404) in the heating temperature control unit (202) stops heating and the cooling channel opens; If the temperature difference ΔT i When the temperature difference is greater than the set minimum temperature difference, the heating element (404) in the heating and temperature control unit (202) corresponding to the lower temperature area stops heating and the cooling channel is closed.

7. The refined temperature control method for fiber resin-based composite material molding process according to claim 6, characterized in that: A heat insulation board (410) is provided on the bottom surface of the heating temperature control board (405), and a heating element socket (411) is provided on the bottom surface of the heat insulation board (410); A cooling channel opening communicating with the cooling channel and a cooling channel end face seal (406) capable of sealingly cooperating with the cooling channel opening are provided on the side surface of the heating temperature control plate (405).

8. The refined temperature control method for fiber resin-based composite material molding process according to claim 6 or 7, characterized in that: The combined multi-point heating and temperature-controlled mold (2) further comprises a base arranged below the heating and temperature-controlled unit (202) and surrounded by a mold end plate (205), a mold side plate (204) and a mold bottom sealing plate (206); The base is provided with side pads (207) and a middle pad (208) for supporting the heating and temperature control unit (202) and the forming mold (201).

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