Forming die and compression molding process method for tubular composite workpiece

Abstract

The invention discloses a forming die of a tubular composite workpiece and a compression molding process method, and relates to the technical field of composite forming. According to the forming die for the tubular composite part, an upper die and a lower die are each provided with a forming groove and a mounting groove, when the upper die and the lower die form an outer die, the forming groove of the upper die and the forming groove of the lower die define a forming cavity, the mounting groove of the upper die and the mounting groove of the lower die define a mounting channel, and the mounting channel communicates with the external environment of the forming cavity and the external environment of the outer die; the core mold comprises a core mold body and a vacuum bag, the core mold body is coated with the vacuum bag, and the core mold is used for filling an inner cavity of the tubular composite part and enabling the internal structure of the tubular composite part to be formed; the ventilation assembly is communicated with the inner cavity of the vacuum bag, the tail end of the ventilation assembly and / or the bag opening of the vacuum bag can be arranged in the installation channel in a sleeved mode so that the head end of the ventilation assembly can be located outside the outer mold, and the wall face forming quality of the tubular composite part can be effectively improved by using the forming mold to prepare the tubular composite part.

Description

Technical Field

[0001] This application relates to the technical field of composite material forming, and more specifically, to a forming mold for tubular composite parts. In addition, this application also relates to a molding process method for preparing tubular composite parts by applying the above-mentioned forming mold. Background Art

[0002] In daily composite material laying workshops, workshop operators often encounter situations where precise forming of tubular composite parts is required. When using existing molds for production, the following common processes are found:

[0003] One-time forming process. Specifically, first put the forming raw materials into the mold, close the mold, then put the mold into the curing and forming equipment to achieve curing, and finally perform demolding operation to take out the formed tubular composite part.

[0004] Post-treatment process. Specifically, first mold and form a solid semi-finished pressed part through the mold, and then drill the semi-finished pressed part to make the wall thickness of the tubular composite part meet the design dimensions, obtaining a slender tubular composite part.

[0005] However, there will be various scratches on the inner wall surface of the tubular composite parts produced by using the above processes, which greatly reduces the forming quality of the tubular composite parts.

[0006] In summary, how to ensure the forming quality of the inner wall surface of tubular composite parts is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a forming mold for tubular composite parts, and using this forming mold for preparation can effectively improve the wall surface forming quality of tubular composite parts.

[0008] Another purpose of this application is to provide a molding process method for preparing tubular composite parts by applying the above-mentioned forming mold.

[0009] To achieve the above purpose, this application provides the following technical solutions:

[0010] A forming mold for tubular composite parts, comprising: an upper mold, a lower mold, a core mold, and a ventilation assembly;

[0011] Both the upper mold and the lower mold have a forming groove and a mounting groove. When the upper mold and the lower mold are closed to form an outer mold, the forming groove of the upper mold and the forming groove of the lower mold enclose to form a forming cavity, and the mounting groove of the upper mold and the mounting groove of the lower mold enclose to form a mounting channel, and the mounting channel communicates with the forming cavity and the external environment of the outer mold;

[0012] The core mold includes a core mold body and a vacuum bag. The vacuum bag covers the core mold body, and the core mold is used to fill the inner cavity of the tubular composite part and form the internal structure of the tubular composite part.

[0013] The ventilation component has a diversion channel. The diversion channel communicates with the inner cavity of the vacuum bag, and the tail end of the ventilation component and / or the bag mouth of the vacuum bag can be sleeved in the installation channel, so that the head end of the ventilation component is located outside the outer mold, and vacuum bag pressing treatment can be carried out through the ventilation component.

[0014] Preferably, the number of the installation channels is two. One installation channel is connected in a conducting manner to one end of the same molding cavity, and the other installation channel is connected in a conducting manner to the other end of the same molding cavity.

[0015] Preferably, the ventilation component includes a nozzle, a ventilation pipe, a ventilation fixing nut and an internal positioning ring.

[0016] The ventilation pipe is threadedly connected and inserted into the inner part of one end of the ventilation fixing nut. The internal positioning ring is threadedly connected and inserted into the inner part of the other end of the ventilation fixing nut. The tail end of the nozzle is connected to the ventilation pipe, and the internal cavity of the nozzle, the internal cavity of the ventilation pipe, the internal cavity of the fixing nut and the internal cavity of the internal positioning ring are sequentially communicated to form the diversion channel.

[0017] The internal positioning ring is used to connect to the vacuum bag. The installation channel is a variable-diameter through hole, and the internal positioning ring can be nested in the variable-diameter section of the installation channel to position the core mold.

[0018] Preferably, the number of the molding grooves on the upper mold and the number of the molding grooves on the lower mold are both greater than or equal to two. After the lower mold and the upper mold are clamped together, several molding grooves on the upper mold and the corresponding molding grooves on the lower mold enclose to form the molding cavity.

[0019] And several molding grooves on the upper mold extend along the length direction of the upper mold and are arranged along the width direction of the upper mold.

[0020] Several molding grooves on the lower mold extend along the length direction of the lower mold and are arranged along the width direction of the lower mold.

[0021] Preferably, a temperature detector is inserted into the upper mold. The detection head of the temperature detector abuts against the cavity wall of the molding cavity and is used to detect the temperature of the cavity wall of the molding cavity.

[0022] One of the lower mold and the upper mold has a mounting through-hole, and the other has a threaded hole. After the lower mold and the upper mold are closed, a plurality of the mounting through-holes and the corresponding threaded holes extend coaxially for inserting threaded fasteners;

[0023] One of the lower mold and the upper mold has a mold closing positioning pin, and the other has a mold closing positioning pin hole. After the lower mold and the upper mold are closed, a plurality of the mold closing positioning pins can be inserted into the corresponding mold closing positioning pin holes;

[0024] The outer periphery of the upper mold or the lower mold has an opening mold flat groove for inserting an opening mold device to pry open the upper mold and the lower mold;

[0025] The lower mold has an overflow glue groove, and the overflow glue groove communicates with the molding cavity for discharging the composite material overflowing from the molding cavity.

[0026] A molding process method, which applies the molding die for tubular composite parts described in any one of the above, to prepare tubular composite parts. The molding process method includes:

[0027] S1: Pretreat the cavity wall of the molding cavity of the molding die for the tubular composite part to meet the requirements for forming the external structure of the tubular composite part;

[0028] And wrap the vacuum bag around the outside of the core mold body;

[0029] S2: Lay fiber pre-impregnated materials on the outer periphery of the core mold to form a pre-treated molded part;

[0030] S3: Place the pre-treated molded part in the molding cavity, and then close and fix the upper mold and the lower mold;

[0031] S4: Perform vacuum bag pressing treatment;

[0032] S5: Transfer the closed molding die to a hot pressing and curing device for curing treatment;

[0033] S6: Disassemble the taken-out molding die, and then take out the tubular composite part from the molding die.

[0034] Preferably, after S6, it further includes:

[0035] S7: Pretreat the cavity wall of the molding cavity again to meet the requirements for forming the external structure of the tubular composite part.

[0036] Preferably, S4 includes:

[0037] S41: Check the airtightness of the vacuum bag;

[0038] S42: Connect a pressure detector, a vacuum pump valve, and a vacuum pump to the opening of the vacuum bag, and the inner cavity of the vacuum bag, the pressure detector, the vacuum pump valve, and the vacuum pump are connected in sequence;

[0039] S43: Open the vacuum pump valve and start the vacuum pump to perform vacuuming;

[0040] S44: After the pressure detector detects that the vacuum bag has reached the preset vacuum degree, close the vacuum pump valve;

[0041] S45: During the next preset observation time, obtain the vacuum degree in real time through the pressure detector;

[0042] If the vacuum degree drop is less than or equal to the preset pressure value, seal the opening of the vacuum bag, and disconnect the vacuum pump, the pressure detector, and the vacuum pump valve;

[0043] If the vacuum degree drop is greater than the preset pressure value, check the vacuum bag, re-seal the leak point of the vacuum bag, and then return to step S43 to the step of obtaining the vacuum degree in real time until the vacuum degree drop is less than or equal to the preset pressure value during the preset observation time, then seal the opening of the vacuum bag, and disconnect the vacuum pump, the pressure detector, and the vacuum pump valve.

[0044] Preferably, the S5 includes:

[0045] S51: Control the hot pressing and curing equipment to pressurize to the curing pressure;

[0046] S52: Control the hot pressing and curing equipment to heat at a preset heating rate, and control the material in the forming cavity to heat to the curing temperature at a preset temperature rising rate;

[0047] S53: After waiting for the preset heat preservation time, control the hot pressing and curing equipment to cool down at a preset cooling rate, and control the material in the forming cavity to cool down to the pressure relief temperature at a preset temperature dropping rate;

[0048] S54: Perform pressure relief and vacuum relief;

[0049] S55: Naturally cool to the out-of-tank temperature.

[0050] Preferably, the pretreatment of the cavity wall of the forming cavity includes:

[0051] Remove the dirt attached to the cavity wall of the forming cavity;

[0052] Wipe with anhydrous ethanol to clean the cavity wall of the forming cavity;

[0053] After the cavity wall of the molding cavity is dried, a release agent coating is formed by coating on the cavity wall of the molding cavity.

[0054] Preferably, the forming of the release agent coating on the cavity wall of the molding cavity includes:

[0055] Coat a release agent on the cavity wall of the molding cavity to form a film-shaped first release agent coating;

[0056] After waiting for 15 minutes, coat a release agent on the surface of the first release agent coating to form a film-shaped second release agent coating;

[0057] After waiting for 15 minutes, coat a release agent on the surface of the second release agent coating to form the complete release agent coating.

[0058] In this application, forming grooves are provided at the middle positions on the upper sides of the upper mold and the lower mold, and mounting grooves are provided at the peripheral positions on the upper sides of the upper mold and the lower mold. The inner ends of the mounting grooves extending towards the inside of the molding die communicate with the forming grooves on the upper mold or the lower mold where they are located, and the outer ends penetrate through the peripheral walls of the upper mold or the lower mold where they are located to communicate with the peripheral surface environment of the upper mold or the lower mold where they are located. During use, the upper mold is flipped and buckled on the lower mold, so that the forming grooves on the upper mold are arranged opposite to the forming grooves on the lower mold, and the mounting grooves on the upper mold are arranged opposite to the mounting grooves on the lower mold. And after the upper mold and the lower mold are closely fitted to complete the mold closing to form an outer mold, the forming grooves of the upper mold and the forming grooves of the lower mold enclose to form a relatively closed molding cavity with a preset shape and size. Similarly, the mounting grooves of the upper mold and the mounting grooves of the lower mold enclose to form a mounting channel, and then the molding cavity communicates with the external environment of the outer mold through the mounting channel.

[0059] Correspondingly, the molding die is also equipped with a core mold. The outer wall of the tubular composite part to be achieved by the upper and lower molds can be formed into the preset shape and size. At the same time, the inner wall of the tubular composite part to be achieved by the support of the core mold can be formed. In order to ensure the quality of the inner wall surface of the tubular composite part prepared using the molding die, in the core mold, the core mold body adopts a rod-shaped structure or a tubular structure with the same shape as the inner wall of the pre-prepared tubular composite part, and the size is N times the structure of the inner cavity mold of the pre-prepared tubular composite part, and N is less than 1, that is, the core mold body Compared with the structure molded out of the inner cavity of the pre-prepared tubular composite part mentioned above, it is a structure scaled down according to a preset ratio, and is used to be inserted inside the tubular composite part to support it. The vacuum bag is evenly coated on the periphery of the core mold body, and the core mold body and the vacuum bag that are sleeved together constitute a complete core mold. When in use, the fiber prepreg for preparing the tubular composite part is laid and wrapped on the periphery of the core mold, and then the core mold and the fiber prepreg structure coated on its periphery are placed in the molding groove of the lower mold, and then the upper mold is buckled on the lower mold to achieve mold closing, and the tubular composite part can be obtained after curing.

[0060] Correspondingly, the molding die is equipped with a ventilation component, which is a tubular structure, and the inner cavity of the ventilation component is the above-mentioned guide channel. When in use, the ventilation component is embedded in the installation channel, and the end of the ventilation component extending to the inner side of the molding die is plugged into the matching vacuum bag, so that the guide channel of the ventilation component is connected with the inner cavity of the vacuum bag. The end of the ventilation component extending to the outside of the molding die is open, so that it can be connected to the vacuum system through the outer end located outside the outer mold, so that the ventilation component can evacuate the vacuum bag, that is, perform the above-mentioned vacuum bag pressure treatment. When in use, the vacuum bag pressure treatment is performed before the mold is closed, that is, the vacuum bag is evacuated. Because when demolding, after the vacuum bag is vented, it is easier to pull the core mold body out of the vacuum bag, and then the vacuum bag can also be easily pulled out of the tubular composite part, that is, the core mold in the molding die is easier to separate from the tubular composite part, and the inner surface quality of the tubular composite part prepared using the molding die is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0062] Figure 1 A schematic diagram of the structure of a specific embodiment provided in this application;

[0063] Figure 2 Top view of the specific embodiment provided by this application;

[0064] Figure 3 Front view of the specific embodiment provided by this application;

[0065] Figure 4 Flow chart of the compression molding process method of the specific embodiment provided by this application;

[0066] Figure 5 Another flow chart of the compression molding process method of the specific embodiment provided by this application;

[0067] Figure 6 Flow chart of step S4 of the specific embodiment provided by this application;

[0068] Figure 7 Flow chart of step S5 of the specific embodiment provided by this application.

[0069] Reference numerals:

[0070] 1 - upper die; 11 - forming groove; 12 - mounting groove; 13 - mounting through hole; 14 - die - closing positioning pin hole;

[0071] 2 - lower die; 21 - threaded hole; 22 - die - closing positioning pin; 23 - die - opening flat groove; 24 - overflow groove; 25 - lifting ring threaded hole;

[0072] 3 - core mold; 31 - core mold body; 32 - vacuum bag;

[0073] 4 - ventilation assembly; 41 - air nozzle; 42 - ventilation pipe; 43 - ventilation fixing nut; 44 - internal positioning ring;

[0074] 5 - temperature detector;

[0075] 6 - tubular composite part. Detailed implementation manners

[0076] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0077] The core of this application is to provide a forming mold for a tubular composite part. Using this forming mold for preparation can effectively improve the wall forming quality of the tubular composite part 6. Another core of this application is to provide a compression molding process method for preparing the tubular composite part 6 by applying the above - mentioned forming mold.

[0078] The present application provides a forming mold for a tubular composite part, including an upper mold 1, a lower mold 2, a core mold 3, and a ventilation assembly 4. Among them, both the upper mold 1 and the lower mold 2 have a forming groove 11 and a mounting groove 12. When the upper mold 1 and the lower mold 2 are closed to form an outer mold, the forming groove 11 of the upper mold 1 and the forming groove 11 of the lower mold 2 enclose a forming cavity, and the mounting groove 12 of the upper mold 1 and the mounting groove 12 of the lower mold 2 enclose a mounting channel, and the mounting channel communicates with the forming cavity and the external environment of the outer mold. The core mold 3 includes a core mold body 31 and a vacuum bag 32. The vacuum bag 32 is coated on the core mold body 31, and the core mold 3 is used to fill the inner cavity of the tubular composite part 6 and form the internal structure of the tubular composite part 6. The ventilation assembly 4 has a diversion channel, and the diversion channel is communicated with the inner cavity of the vacuum bag 32. The tail end of the ventilation assembly 4 and / or the bag mouth of the vacuum bag 32 can be sleeved in the mounting channel, so that the head end of the ventilation assembly 4 is located outside the outer mold, so as to be able to perform vacuum bag pressing treatment through the ventilation assembly 4.

[0079] Specifically, as Figure 1 and Figure 2 shown, forming grooves 11 are respectively provided at the middle positions on the upper sides of the upper mold 1 and the lower mold 2, and mounting grooves 12 are respectively provided at the peripheral positions on the upper sides of the upper mold 1 and the lower mold 2. The inner ends of the mounting grooves 12 extending towards the inner side of the forming mold are communicated with the forming grooves 11 on the upper mold 1 or the lower mold 2 where they are located, and the outer ends penetrate through the peripheral walls of the upper mold 1 or the lower mold 2 where they are located to communicate with the peripheral surface environment of the upper mold 1 or the lower mold 2 where they are located. During use, flip the upper mold 1 in the orientation shown in Figure 1 and Figure 2 and buckle it on the upper surface of the lower mold 2, so that the forming groove 11 on the upper surface of the upper mold 1 is arranged opposite to the forming groove 11 on the upper surface of the lower mold 2, and the mounting groove 12 on the upper surface of the upper mold 1 is arranged opposite to the mounting groove 12 on the upper surface of the lower mold 2, and Figure 1 and Figure 2 the upper surface of the upper mold 1 shown in Figure 1 and Figure 2 is tightly fitted with the upper surface of the lower mold 2 shown in Figure 1 and Figure 2 to complete the mold closing to form an outer mold. Then, the forming groove 11 of the upper mold 1 and the forming groove 11 of the lower mold 2 enclose a relatively closed forming cavity with a preset shape and size. Similarly, the mounting groove 12 of the upper mold 1 and the mounting groove 12 of the lower mold 2 enclose a mounting channel, and the forming cavity communicates with the external environment of the outer mold through the mounting channel.

[0080] Correspondingly, the molding die is also equipped with a core mold 3. The outer wall of the tubular composite part 6 can be formed into the preset shape and size through the restriction of the upper mold 1 and the lower mold 2. At the same time, the inner wall of the tubular composite part 6 can be formed into the preset shape and size through the support of the core mold 3. In order to ensure the quality of the inner wall surface of the tubular composite part 6 prepared using the molding die, in the core mold 3, the core mold body 31 adopts a rod-shaped structure or a tubular structure with the same shape as the inner wall of the pre-prepared tubular composite part 6, and the size is N times that of the structure of the inner cavity inverted mold of the pre-prepared tubular composite part 6, and N is less than 1, that is, the core mold body 31 is relatively The structure molded out of the inner cavity of the pre-prepared tubular composite part 6 is reduced in size according to a preset ratio and is used to be inserted into the interior of the tubular composite part 6 to support it. The vacuum bag 32 is evenly coated on the periphery of the core mold body 31. The core mold body 31 and the vacuum bag 32 that are sleeved together form a complete core mold 3. When in use, the fiber prepreg for preparing the tubular composite part 6 is laid and wrapped on the periphery of the core mold 3, and then the core mold 3 and the fiber prepreg structure coated on its periphery are placed in the molding groove 11 of the lower mold 2, and then the upper mold 1 is buckled on the lower mold 2 to achieve mold closing, and the tubular composite part 6 can be obtained after curing.

[0081] In cooperation, the molding die is equipped with a ventilation component 4, which is a tubular structure, and the inner cavity of the ventilation component 4 is the above-mentioned guide channel. When in use, the ventilation component 4 is embedded in the installation channel, and the end of the ventilation component 4 extending to the inner side of the molding die is plugged into the vacuum bag 32, so that the guide channel of the ventilation component 4 is connected with the inner cavity of the vacuum bag 32, and the end of the ventilation component 4 extending to the outer side of the molding die is open, so that the vacuum system can be connected through the outer end located outside the outer mold to realize the vacuum bag 32. , that is, the above-mentioned vacuum bag pressing treatment is carried out. When in use, the vacuum bag pressing treatment is carried out before the mold is closed, that is, the vacuum bag 32 is evacuated. Since the vacuum bag 32 is de-vacuated during demoulding, in some specific embodiments, the core mold body 31 can be easily drawn out of the vacuum bag 32, and then the vacuum bag 32 can also be easily pulled out of the tubular composite part 6, that is, the core mold 3 in the molding mold can be easily separated from the tubular composite part 6, and the inner surface quality of the tubular composite part 6 prepared using the molding mold is higher.

[0082] On the basis of the above embodiment, the number of mounting channels is two, one mounting channel is conductively connected to one end of the same molding cavity, and the other mounting channel is conductively connected to the other end of the same molding cavity.

[0083] A long strip molding cavity is equipped with two installation channels, specifically, Figures 1 to 3As shown in the figure, the left end of the forming cavity is connected to the external environment of the mold through the left installation channel, and the right end of the forming cavity is connected to the external environment of the mold through the right installation channel. During use, ventilation components 4 are connected to both the left end and the right end of the vacuum bag 32, and the two sets of ventilation components 4 are respectively arranged in the corresponding installation channels. When controlling the internal air pressure of the vacuum bag 32, the internal air pressure can be adjusted from left to right through the left ventilation component 4, and the internal air pressure of the vacuum bag 32 can be adjusted from right to left through the right ventilation component 4. Therefore, the stability and uniformity of the air pressure adjustment of the vacuum bag are relatively high, which is beneficial to ensuring the quality of the tubular composite part 6 and improving the efficiency of preparing the tubular composite part 6.

[0084] On the basis of the above embodiment, the ventilation component 4 includes a nozzle 41, a ventilation pipe 42, a ventilation fixing nut 43, and an internal positioning ring 44. The ventilation pipe 42 is threadedly connected and inserted into one end of the ventilation fixing nut 43, and the internal positioning ring 44 is threadedly connected and inserted into the other end of the ventilation fixing nut 43. The tail end of the nozzle 41 is connected to the ventilation pipe 42, and the internal cavity of the nozzle 41, the internal cavity of the ventilation pipe 42, the internal cavity of the fixing nut 43, and the internal cavity of the internal positioning ring 44 are sequentially connected to form a diversion channel. The internal positioning ring 44 is used to connect to the vacuum bag 32. The installation channel is a variable-diameter through hole, and the internal positioning ring 44 can be nested in the variable-diameter section of the installation channel to position the core mold 3.

[0085] Specifically, as Figures 1 to 3 shown, taking the left ventilation component 4 as an example for illustration, in the ventilation component 4, the ventilation fixing nut 43 has a structure with internal threads machined on its inner wall. Correspondingly, the outer wall of the left end of the internal positioning ring 44 is machined with threads to be inserted into the right end of the ventilation fixing nut 43 and threadedly connected to the ventilation fixing nut 43. Moreover, the outer part of the right end of the ventilation pipe 42 is also machined with threads to be inserted into the left end of the ventilation fixing nut 43 and threadedly connected to the ventilation fixing nut 43. The nozzle 41 is directly connected to the pipeline for external vacuum treatment, such as the pipeline connected to a vacuum pump, etc., and the right end of the nozzle 41 is connected to the left end of the ventilation pipe 42. With such a setting, the structure of the ventilation component 4 is simple, convenient for assembly, and convenient for connecting the pipeline for vacuum treatment.

[0086] Furthermore, the installation channel is a variable-diameter through hole, and the cross-sectional dimension of the part of the hole of the installation channel located inside the forming mold is smaller or larger than the remaining holes of the installation channel. During use, the internal positioning ring 44 is fitted into the hole section where the cross-sectional dimension of the installation channel is reduced or increased, so that the two sets of ventilation components 4 can be positioned, and thereby the core mold 3 connected by the two sets of ventilation components 4 can be positioned.

[0087] In some specific embodiments, the gas nozzle 41 is micro-beam plasma welded to the ventilation pipe 42. The gap between the ventilation pipe 42 and the ventilation fixing nut 43 which are inserted and matched with each other is filled with sealant, and the gap between the ventilation fixing nut 43 and the internal positioning ring 44 which are inserted and matched with each other is filled with sealant. When in use, the internal positioning ring 44 is bonded to the vacuum bag 32 with strong glue.

[0088] On the basis of the above embodiments, the number of the forming grooves 11 of the upper die 1 and the number of the forming grooves 11 of the lower die 2 are both greater than or equal to two. After the lower die 2 and the upper die 1 are clamped, a number of the forming grooves 11 of the upper die 1 and the corresponding forming grooves 11 of the lower die 2 enclose to form a forming cavity; and a number of the forming grooves 11 of the upper die 1 extend along the length direction of the upper die 1 and are arranged along the width direction of the upper die 1; a number of the forming grooves 11 of the lower die 2 extend along the length direction of the lower die 2 and are arranged along the width direction of the lower die 2.

[0089] Specifically, as Figure 1 and Figure 2 shown, both the upper die 1 and the lower die 2 are provided with a number of forming grooves 11. The forming grooves 11 extend along the length direction of the upper die 1 or the lower die 1 where they are located, and a number of the forming grooves 11 are arranged along the length direction of the upper die 1 or the lower die 1 where they are located. Then, after the upper die 1 and the lower die 2 are clamped, a number of forming cavities can be enclosed. With such a setting, the structure of the forming die is simple, the layout is reasonable, and it is beneficial to improve the preparation efficiency of the tubular composite part 6.

[0090] Further, in some specific embodiments, a temperature detector 5 is inserted into the upper die 1. The detection head of the temperature detector 5 abuts against the cavity wall of the forming cavity for detecting the temperature of the cavity wall of the forming cavity.

[0091] As Figure 1 and Figure 2 shown, an installation hole is formed on the upper die 1 to insert the temperature detector 5. The detection head of the temperature detector 5 extends into the interior of the upper die 1 and abuts against the cavity wall of the forming cavity to detect the temperature inside the forming cavity.

[0092] Further, in some specific embodiments, one of the lower die 2 and the upper die 1 has an installation through hole 13, and the other has a threaded hole 21. After the lower die 2 and the upper die 1 are clamped, a number of the installation through holes 13 and the corresponding threaded holes 21 extend coaxially for inserting threaded fasteners.

[0093] As Figure 1 and Figure 2As shown, one of the mounting through holes 13 and threaded holes 21 is provided on the upper mold 1. Correspondingly, the other of the mounting through holes 13 and threaded holes 21 is provided on the lower mold 2. During use, after the upper mold 1 is buckled on the lower mold 2, a threaded fastener with an external thread is inserted into the coaxial mounting through hole 13 and threaded hole 21 to realize the mold closing of the upper mold 1 and the lower mold 2.

[0094] Furthermore, in some specific embodiments, one of the lower mold 2 and the upper mold 1 has a mold closing locating pin 22, and the other has a mold closing locating pin hole 14. After the lower mold 2 and the upper mold 1 are closed, a plurality of mold closing locating pins 22 can be inserted into the corresponding mold closing locating pin holes 14.

[0095] As Figure 1 and Figure 2 shown, one of the mold closing locating pin 22 and the mold closing locating pin hole 14 is provided on the upper mold 1. Correspondingly, the other of the mold closing locating pin 22 and the mold closing locating pin hole 14 is provided on the lower mold 2. When the upper mold 1 needs to be buckled on the lower mold 2, by observing the positions of the mold closing locating pin 22 and the mold closing locating pin hole 14, a plurality of mold closing locating pins 22 are inserted into the corresponding mold closing locating pin holes 14, and then the positioning of the upper mold 1 can be realized, and thus the upper mold 1 and the lower mold 2 can be conveniently fixed.

[0096] Furthermore, in some specific embodiments, the outer periphery of the upper mold 1 or the lower mold 2 has a mold opening flat groove 23 for inserting a mold opener to pry open the upper mold 1 and the lower mold 2.

[0097] As Figure 1 and Figure 2 shown, a mold opening flat groove 23 is provided at the top corner or the middle position around the lower mold 2 or the upper mold 1. The mold opening flat groove 23 can be a triangular groove or a rectangular groove, etc. During use, the head end of a mold opener such as a crowbar or a forklift is inserted into the mold opening flat groove 23, and a thrust along the buckling direction of the upper mold 1 and the lower mold 2 is applied, and then the upper mold 1 and the lower mold 2 can be pried open. With such a setting, the demolding of the upper mold 1 and the lower mold 2 is facilitated.

[0098] Furthermore, in some specific embodiments, the lower mold 2 has a glue overflow groove 24 which communicates with the molding cavity and is used for discharging the composite material overflowing from the molding cavity.

[0099] As Figure 1 and Figure 2 shown, a linear or curved glue overflow groove 24 is provided on the lower mold 2. The end of the glue overflow groove 24 extending towards the outer periphery of the lower mold 2 penetrates the outer wall of the lower mold 2, and the end of the glue overflow groove 24 extending towards the central position of the lower mold 2 penetrates the wall of the molding groove 11 on the upper surface of the lower mold 2. Then, the excessive resin in the molding cavity can be discharged from the molding cavity through the glue overflow groove 24 to ensure the molding quality of the tubular composite part 6.

[0100] Furthermore, as Figure 1 and Figure 2 shown, in some specific embodiments, the peripheral wall of the lower mold 2 has a plurality of lifting ring threaded holes 25. During use, the tail end of the lifting ring is inserted into the lifting ring threaded hole 25, and the lifting ring is threadedly connected to the lower mold 2. Then, the lifting ring can be used to hoist and transfer the mold and the tubular composite part 6 inside it.

[0101] In addition to the forming mold for the tubular composite part described above, the present application also provides a molding process method for preparing the tubular composite part 6 by using the forming mold disclosed in the above embodiments. The molding process method includes the following steps:

[0102] Step S1: Pretreat the cavity wall of the forming cavity of the forming mold for the tubular composite part to meet the requirements for forming the external structure of the tubular composite part 6;

[0103] And wrap the vacuum bag 32 around the outside of the core mold body 31;

[0104] It can be understood that this step is to make preparations before manufacturing the part. Specifically, to ensure the cleanliness of the cavity wall of the forming cavity for the tubular composite part 6, the cavity wall of the forming cavity is pre-cleaned to ensure the quality of the outer wall of the tubular composite part 6; and the vacuum bag 32 is sleeved on the outside of the core mold body 31 to form a complete core mold 3;

[0105] Step S2: Lay fiber prepregs on the outer periphery of the core mold 3 to form a pre-treated formed part;

[0106] It can be understood that this step is to pre-treat the fiber prepregs in the raw materials, that is, the fiber prepregs are laid and wound around the circumferential surface of the core mold 3 in sequence and evenly to form a tubular pre-treated formed part with a certain thickness and having a plurality of fiber laminations. Then, the pre-treated formed part is supported by the core mold 3;

[0107] Step S3: Place the pre-treated formed part in the forming cavity, and then, close and fix the upper mold 1 and the lower mold 2;

[0108] It can be understood that in this step, the core mold 3 and the pre-treated formed part sleeved on its outside are placed in the forming cavity of the forming mold, and a closing operation is performed. During the forming process, the shape and volume of the tubular composite part 6 are jointly restricted by the upper mold 1, the lower mold 2, and the core mold 3 to ensure that the tubular composite part 6 is an integral structure without delamination;

[0109] Step S4: Perform vacuum bag pressing treatment;

[0110] It is understandable that in this step, the vacuum bag pressing treatment refers to evacuating the vacuum bag 32. After this treatment, the vacuum bag 32 will tightly adhere to the circumferential surface of the mandrel body 31, which is beneficial to ensuring the shape of the inner wall surface of the tubular composite part 6 formed by the support of the mandrel 3;

[0111] Furthermore, to ensure the smooth separation of the mandrel 3 and the tubular composite part 6, during the vacuum bag pressing treatment, the order of auxiliary material wrapping is, from the inside to the outside, the release cloth, the non-porous isolation film, the breather felt, and the vacuum bag 32.

[0112] Step S5: Transfer the closed molding die to a hot pressing and curing device for curing treatment;

[0113] It is understandable that after completing the raw material treatment and the preparation of the molding die through the above steps, this step sends the molding die and the pre-treated molded part inside it into the hot pressing and curing device together, so that the pre-treated molded part is cured to form the final tubular composite part 6 through the pressurization and heating of the hot pressing and curing device;

[0114] Step S6: Disassemble the taken-out molding die, and then take out the tubular composite part 6 from the molding die;

[0115] It is understandable that this step takes out the cured molding die from the hot pressing and curing device, and then performs the mold opening operation, that is, separating the upper mold 1 and the lower mold 2. Then, take out the tubular composite part 6 from the molding cavity, and separate the tubular composite part 6 from the mandrel 3 to realize the demolding of the tubular composite part 6.

[0116] The internal and external surface qualities of the tubular composite part 6 prepared by this molding process method are guaranteed, and it has extremely high strength and hardness, excellent compressive resistance and anti-bending resistance, an extremely long service life, and great industrial operation and maintenance value.

[0117] On the basis of the above embodiments, after step S6, the following steps are further included:

[0118] Step S7: Pretreat the cavity wall of the molding cavity again to meet the requirements for the external structure molding of the tubular composite part 6; It is understandable that after the tubular composite part 6 is prepared using the molding die, the surface of the molding die is cleaned to prepare for the next preparation of the tubular composite part 6.

[0119] On the basis of the above embodiments, step S4 includes the following steps:

[0120] Step S41: Check the airtightness of the vacuum bag 32. It can be understood that before the vacuum pumping process, the airtightness of the vacuum bag 32 is checked first to ensure the airtightness of the vacuum bag 32 to be used. Then, after the subsequent vacuum pumping process, the vacuum bag 32 can maintain the vacuum degree, effectively avoiding the failure of the vacuum bag 32.

[0121] Step S42: Connect a pressure detector, a vacuum pumping valve, and a vacuum pump to the bag opening of the vacuum bag 32, and the inner cavity of the vacuum bag 32, the pressure detector, the vacuum pumping valve, and the vacuum pump are connected in sequence. It can be understood that a vacuum pump is connected to the bag opening of the vacuum bag 32, and the inlet of the vacuum pump is communicated with the inner cavity of the vacuum bag 32 to be able to pump vacuum for the vacuum bag 32. A pressure detector and a vacuum pumping valve are arranged between the vacuum pump and the vacuum bag 32. The pressure detector can adopt a pressure gauge or a pressure sensor, etc., and the vacuum pumping valve can adopt a switch valve or a stop valve, etc. Among them, the pressure detector is located on the side close to the vacuum bag 32, and the vacuum pumping valve is located on the side close to the vacuum pump. Then, the opening and closing of the opening at the bag opening of the vacuum bag 32 can be controlled through the vacuum pumping valve. At the same time, regardless of the opening and closing of the vacuum pumping valve, the pressure in the vacuum bag 32, that is, the vacuum degree of the vacuum bag 32, can be detected through the pressure detector.

[0122] Optionally, two vacuum pumping valves are provided, which are respectively placed on the left and right sides of the molding die, and are both about 40 mm - 60 mm away from the molding die.

[0123] Step S43: Open the vacuum pumping valve and start the vacuum pump to perform the vacuum pumping process. It can be understood that after the layout of the pipeline connected to the vacuum bag 32 is completed, the vacuum pumping can be started to meet the requirements.

[0124] Step S44: After the pressure detector detects that the vacuum bag 32 of the vacuum bag 32 reaches the preset vacuum degree, close the vacuum pumping valve. It can be understood that during the vacuum pumping process, the detection result of the pressure detector is read in real time through the pressure detector to learn the pressure in the vacuum bag 32 in real time. Then, it is convenient to control the vacuum pumping valve to stop, that is, stop the vacuum pumping, after reaching the preset vacuum degree. For example, when the vacuum degree reaches less than or equal to -0.098 MPa.

[0125] Step S45: During the next preset observation time, obtain the vacuum degree in real time through the pressure detector.

[0126] If the decrease in the vacuum degree is less than or equal to the preset pressure value, seal the bag opening of the vacuum bag 32, and disconnect the vacuum pump, the pressure detector, and the vacuum pumping valve.

[0127] If the decrease in the vacuum degree is greater than the preset pressure value, check the vacuum bag 32, reseal the leak point of the vacuum bag 32, and then return to step S43, the step of obtaining the vacuum degree in real time, until the decrease in the vacuum degree within the preset observation time is less than or equal to the preset pressure value, then seal the opening of the vacuum bag 32, and disconnect the vacuum pump, the pressure detector, and the vacuum extraction valve;

[0128] It can be understood that after controlling the closing of the vacuum extraction valve, continuously and real-time read the detection result of the pressure detector to learn the pressure in the vacuum bag 32 in real time and observe the ability of the vacuum bag 32 to maintain vacuum. Specifically, in some specific embodiments, if the decrease in the vacuum degree within the preset observation time is less than or equal to the preset pressure value, for example, the decrease in the vacuum degree within 5 minutes is less than or equal to 0.017 MPa, it indicates that the sealing performance of the vacuum bag 32 meets the standard. Then, seal the vacuum bag 32 to form the mandrel 3 that meets the requirements, and then disconnect the vacuum pump, the pressure detector, and the vacuum extraction valve from the vacuum bag 32, which can be used for the subsequent operation steps of forming the tubular composite part 6 using the forming die; In other specific embodiments, if the decrease in the vacuum degree within the preset observation time is greater than the preset pressure value, for example, the decrease in the vacuum degree within 5 minutes is greater than 0.017 MPa, it indicates that the sealing performance of the vacuum bag 32 does not meet the standard. Next, check the vacuum bag 32 to reseal the leak point of the vacuum bag 32, and then repeat the step of testing the sealing performance of the vacuum bag 32 until the sealing performance of the vacuum bag 32 meets the standard. Then, seal the vacuum bag 32 to form the mandrel 3 that meets the requirements, and then disconnect the vacuum pump, the pressure detector, and the vacuum extraction valve from the vacuum bag 32, which can be used for the subsequent operation steps of forming the tubular composite part 6 using the forming die;

[0129] Based on the above embodiments, step S5 includes the following steps:

[0130] Step S51: Control the hot pressing and curing equipment to pressurize to the curing pressure; It can be understood that when the internal temperature of the hot pressing and curing equipment is equal to the room temperature of the operation room, control the hot pressing and curing equipment to pressurize. In some specific embodiments, the value range of the curing pressure is 0.4 MPa - 0.8 MPa;

[0131] Step S52: Control the hot pressing and curing equipment to heat at a preset heating rate, and control the material in the forming cavity to heat to the curing temperature at a preset heating rate; It can be understood that heating is carried out after pressurization to achieve preheating treatment. In some specific embodiments, the value range of the heating rate is , the curing temperature , the value range of the heating rate is ;

[0132] Step S53: After waiting for the preset heat preservation time, control the hot pressing and curing equipment to cool down at a preset cooling rate, and control the material in the forming cavity to cool down to the pressure relief temperature at a preset cooling rate; it can be understood that during the preset heat preservation time, heat preservation operation is carried out to make the material in the forming cavity fully pressured and heated. Then, control the hot pressing and curing equipment to perform cooling treatment to make the material in the forming cavity cool down slowly to achieve hot pressing and curing. When necessary, the tank door can be opened a small gap. In some specific embodiments, the value range of the heat preservation time is 1h - 5h; the value range of the cooling rate is , the value range of the pressure relief temperature is , the value range of the cooling rate is ;

[0133] Step S54: Perform pressure relief and vacuum relief; it can be understood that this step prepares for subsequent mold opening and demolding;

[0134] Step S55: Naturally cool to the out-of-tank temperature; it can be understood that this step performs cooling to prepare for taking out the forming mold from the hot pressing and curing equipment. In some specific embodiments, naturally cool to , or, in some other specific embodiments, naturally cool until the temperature difference from the room temperature is for out-of-tank.

[0135] Optionally, in some specific embodiments, the curing pressure is 0.6 Mpa, the heating rate is , the curing temperature is , then the heating-up rate is , the heat preservation time is 3h, the cooling rate is , the pressure relief temperature is , the cooling rate is .

[0136] Optionally, in some specific embodiments, the curing pressure is 0.6 Mpa, the heating rate is , the curing temperature is , then the heating-up rate is , the heat preservation time is 3h, the cooling rate is , the pressure relief temperature is , the cooling rate is .

[0137] Optionally, in some specific embodiments, the curing pressure is 0.4 Mpa, the heating rate is , the curing temperature is , then the heating-up rate is , the heat preservation time is 1h, the cooling rate is , the pressure relief temperature is , the cooling rate is .

[0138] Optionally, in some specific embodiments, the curing pressure is 0.8 Mpa, and the heating rate is , and the curing temperature is , then the heating rate is , the heat preservation time is 5 h, and the cooling rate is , the pressure relief temperature is , and the temperature reduction rate is .

[0139] Optionally, in some specific embodiments, the curing pressure is 0.7 Mpa, and the heating rate is , and the curing temperature is , then the heating rate is , the heat preservation time is 4.5 h, and the cooling rate is , the pressure relief temperature is , and the temperature reduction rate is .

[0140] Optionally, in some specific embodiments, the curing pressure is 0.45 Mpa, and the heating rate is , and the curing temperature is , then the heating rate is , the heat preservation time is 1.5 h, and the cooling rate is , the pressure relief temperature is , and the temperature reduction rate is .

[0141] Based on the above embodiments, the cavity wall of the pre-treatment forming cavity includes the following steps:

[0142] Remove the dirt attached to the cavity wall of the forming cavity; it can be understood that first remove the stubborn dirt on the cavity wall of the forming cavity. In some specific embodiments, a copper sheet or a copper scraper can be used for scraping and cleaning, or a fine sandpaper can be used for grinding and cleaning, etc.;

[0143] Wipe the cavity wall of the forming cavity with anhydrous ethanol for cleaning; it can be understood that after the dirt is cleaned from the cavity wall of the forming cavity, the dirt needs to be taken away from the cavity wall of the forming cavity. In some specific embodiments, a clean industrial wiping cloth is dipped in anhydrous ethanol to wipe the cavity wall of the forming cavity clean;

[0144] After the cavity wall of the forming cavity is dried, apply a release agent coating on the cavity wall of the forming cavity; it can be understood that after waiting for the anhydrous ethanol on the cavity wall of the forming cavity to dry, apply a release agent on the cavity wall of the forming cavity to form a release agent layer to prepare for subsequent demolding.

[0145] Based on the above embodiments, applying a release agent coating on the cavity wall of the forming cavity includes the following steps:

[0146] Coat the cavity wall of the forming cavity with a mold release agent to form a film-like first mold release agent coating;

[0147] After waiting for 15 minutes, coat the surface of the first mold release agent coating with a mold release agent to form a film-like second mold release agent coating;

[0148] After waiting for 15 minutes, coat the surface of the second mold release agent coating with a mold release agent to form a complete mold release agent coating;

[0149] It can be understood that the mold release agent is coated three times. In some specific embodiments, a clean industrial wiping cloth is used to dip an appropriate amount of the mold release agent and wipe the cavity wall of the forming cavity to form a thin film of the mold release agent coating on the cavity wall of the forming cavity; and the application interval is 15 minutes each time. The first, second, and third mold release agent coatings applied in an overlapping manner together constitute the above-mentioned mold release agent layer to ensure the adhesion between the mold release agent layer and the forming mold, and is conducive to ensuring the uniformity and wall-hanging effect of the mold release agent layer.

[0150] Preferably, before coating the cavity wall of the forming cavity with a mold release agent to form a film-like first mold release agent coating, the following steps are further included:

[0151] Regulate the temperature in the operation room to a preset temperature range, and the preset temperature range is greater than or equal to , and less than or equal to ;

[0152] And regulate the humidity in the operation room to a preset humidity range, and the humidity is controlled to be less than or equal to .

[0153] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the "upper surface, lower surface" and orientation words "up, down, left, right" mentioned above are defined based on the drawings in the specification.

[0154] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0155] The above has introduced in detail the forming die and the molding process method of the tubular composite part provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A forming die for a tubular composite part, characterized in that: include: An upper mold (1), a lower mold (2), a core mold (3) and a venting component (4); The upper mold (1) and the lower mold (2) both have a molding groove (11) and a mounting groove (12); when the upper mold (1) and the lower mold (2) are combined to form an outer mold, the molding groove (11) of the upper mold (1) and the molding groove (11) of the lower mold (2) enclose a molding cavity, and the mounting groove (12) of the upper mold (1) and the mounting groove (12) of the lower mold (2) enclose a mounting channel, and the mounting channel is connected to the molding cavity and the external environment of the outer mold; The core mold (3) comprises a core mold body (31) and a vacuum bag (32), wherein the vacuum bag (32) is coated on the core mold body (31), and the core mold (3) is used to fill the inner cavity of the tubular composite material part (6) and shape the internal structure of the tubular composite material part (6); The ventilation component (4) has a guide channel, the guide channel is connected to the inner cavity of the vacuum bag (32), and the tail end of the ventilation component (4) and / or the bag opening of the vacuum bag (32) can be sleeved in the installation channel, so that the head end of the ventilation component (4) is located outside the outer mold, so that vacuum bag pressure treatment can be performed through the ventilation component (4).

2. The forming mold for a tubular composite product according to claim 1, characterized in that: There are two installation channels, one of which is conductively connected to one end of the same molding cavity, and the other installation channel is conductively connected to the other end of the same molding cavity.

3. The forming mold for a tubular composite product according to claim 2, characterized in that: The ventilation assembly (4) comprises a gas nozzle (41), a ventilation pipe (42), a ventilation fixing nut (43) and an internal positioning ring (44); The ventilation pipe (42) is threadedly connected and inserted into one end of the ventilation fixing nut (43), the internal positioning ring (44) is threadedly connected and inserted into the other end of the ventilation fixing nut (43), the tail end of the air nozzle (41) is connected to the ventilation pipe (42), and the internal cavity of the air nozzle (41), the internal cavity of the ventilation pipe (42), the internal cavity of the fixing nut (43) and the internal cavity of the internal positioning ring (44) are connected in sequence to form the guide channel; The internal positioning ring (44) is used to be connected to the vacuum bag (32); the installation channel is a variable diameter through hole; and the internal positioning ring (44) can be nested in the variable diameter section of the installation channel to position the core mold (3).

4. The forming mold for a tubular composite product according to claim 2, characterized in that: The number of the molding grooves (11) of the upper mold (1) and the number of the molding grooves (11) of the lower mold (2) are both greater than or equal to two, and after the lower mold (2) and the upper mold (1) are molded together, a plurality of the molding grooves (11) of the upper mold (1) and the corresponding molding grooves (11) of the lower mold (2) enclose the molding cavity; Furthermore, the molding grooves (11) of the plurality of upper molds (1) extend along the length direction of the upper mold (1) and are arranged along the width direction of the upper mold (1); The molding grooves (11) of the plurality of lower molds (2) extend along the length direction of the lower mold (2) and are arranged along the width direction of the lower mold (2).

5. The forming mold for a tubular composite product according to claim 1, characterized in that: The upper mold (1) is provided with a temperature detector (5), the detection head of the temperature detector (5) being in contact with the cavity wall of the molding cavity and being used to detect the temperature of the cavity wall of the molding cavity; One of the lower mold (2) and the upper mold (1) has a mounting through hole (13), and the other has a threaded hole (21); after the lower mold (2) and the upper mold (1) are molded together, a plurality of the mounting through holes (13) extend coaxially with the corresponding threaded holes (21) for inserting threaded fasteners; One of the lower mold (2) and the upper mold (1) has a mold locating pin (22), and the other has a mold locating pin hole (14); after the lower mold (2) and the upper mold (1) are molded together, a plurality of the mold locating pins (22) can be inserted into the corresponding mold locating pin holes (14); The outer periphery of the upper die (1) or the lower die (2) is provided with a die opening flat groove (23) for inserting a die opener to pry open the upper die (1) and the lower die (2); The lower mold (2) has a glue overflow groove (24), the glue overflow groove (24) being connected to the molding cavity and being used to discharge the composite material overflowing from the molding cavity.

6. A compression molding process, characterized in that: The molding die for the tubular composite product according to any one of claims 1 to 5 is used to prepare a tubular composite product (6), wherein the compression molding process comprises: S1: pre-treating the cavity wall of the molding cavity of the molding die of the tubular composite product to meet the requirements of molding the external structure of the tubular composite product (6); and wrapping the vacuum bag (32) around the outside of the core mold body (31); S2: laying fiber prepreg on the periphery of the core mold (3) to form a pre-processed molded part; S3: placing the pre-treated molded part in the molding cavity, and then closing and fixing the upper mold (1) and the lower mold (2); S4: vacuum bagging treatment; S5: transporting the mold after mold closing to a hot pressing curing device for curing; S6: disassembling the removed forming mold, and then taking the tubular composite part (6) out of the forming mold.

7. The compression molding process according to claim 6, characterized in that: After S6, the following further includes: S7: Pre-treating the cavity wall of the molding cavity again to meet the requirements of molding the external structure of the tubular composite part (6).

8. The compression molding process according to claim 6, characterized in that: The S4 comprises: S41: performing a sealing inspection on the vacuum bag (32); S42: connecting a pressure detector, a vacuum valve and a vacuum pump to the bag opening of the vacuum bag (32), and connecting the inner cavity of the vacuum bag (32), the pressure detector, the vacuum valve and the vacuum pump in sequence; S43: opening the vacuum valve and starting the vacuum pump to perform vacuum processing; S44: after the pressure detector detects that the vacuum bag (32) of the vacuum bag (32) has reached a preset vacuum degree, closing the vacuum valve; S45: within the next preset observation time, the vacuum degree is obtained in real time by the pressure detector; If the vacuum degree decreases by less than or equal to a preset pressure value, closing the bag opening of the vacuum bag (32), and disconnecting the vacuum pump, the pressure detector, and the vacuum valve; If the decrease in vacuum degree is greater than the preset pressure value, the vacuum bag (32) is checked, the leaking point of the vacuum bag (32) is resealed, and the process returns to step S43 to the step of obtaining the vacuum degree in real time until the decrease in vacuum degree is less than or equal to the preset pressure value within the preset observation time, the bag opening of the vacuum bag (32) is closed, and the vacuum pump, the pressure detector, and the vacuum valve are disconnected.

9. The compression molding process according to claim 6, characterized in that: The S5 comprises: S51: Control the hot pressing curing equipment to pressurize to a curing pressure; S52: Control the hot pressing curing device to heat at a preset heating rate, and control the material in the molding cavity to heat to a curing temperature at a preset heating rate; S53: After waiting for a preset heat preservation time, controlling the hot pressing curing device to cool down at a preset cooling rate, and controlling the material in the molding cavity to cool down to a pressure relief temperature at a preset cooling rate; S54: release pressure and vacuum; S55: Naturally cool to the tank discharge temperature.

10. The compression molding process according to claim 7, characterized in that: The pre-processing of the cavity wall of the molding cavity comprises: removing dirt attached to the cavity wall of the molding cavity; Wiping with anhydrous ethanol to clean the cavity wall of the molding cavity; After the cavity wall of the molding cavity is dried, a release agent coating is coated on the cavity wall of the molding cavity.

11. The compression molding process according to claim 10, characterized in that: The step of coating the cavity wall of the molding cavity with a release agent coating comprises: Applying a release agent on the cavity wall of the molding cavity to form a first release agent coating in a thin film; After waiting for 15 minutes, a release agent is applied on the surface of the first release agent coating to form a second release agent coating in a thin film form; After waiting for 15 minutes, a release agent is applied on the surface of the second release agent coating to form a complete release agent coating.

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