Composite injection molding mold and sealing method thereof

Abstract

The present application relates to a kind of composite injection molding mold, including mutually buckled molding mold upper die, molding mold lower die, the lower die parting surface of molding mold lower die is equipped with sealing groove, molding mold upper die is opened with multiple sensor interface holes for carrying out pressure detection, sealing agent injection, molding mold upper die has mold glue outlet hole, molding mold lower die has mold glue inlet hole;Wherein, sealing groove includes one inner boundary sealing groove, one outer boundary sealing groove and multiple sub-partition sealing grooves, both ends of each sub-partition sealing groove are communicated with inner boundary sealing groove and outer boundary sealing groove respectively.The present application also relates to a kind of sealing method of composite injection molding mold.The purpose of the composite injection molding mold and its sealing method is to solve the problem that sealing strip leakage point position detection and repair of resin injection molding mold are difficult.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resin-based composite material forming, in particular to a composite material injection forming mold and a sealing method thereof. BACKGROUND

[0002] Resin transfer molding (RTM) technology, the main principle is to first lay the designed preform in the mold cavity, and then use injection equipment to inject special resin system into the mold cavity, and then the resin flows out to expel the gas in the mold cavity while infiltrating the fibers, and then the composite material parts can be obtained by heating, curing, cooling and demolding. When the composite material components are prepared by using the RTM process, a double-sided closed mold is used, and the mold is sealed by a sealing strip. The sealed mold can ensure the vacuum state of the mold cavity before injection and the resin sealing problem of the mold cavity under the injection pressure. When there is a leak point in the sealing strip, although it is easy to test that the vacuum leakage of the mold cavity has occurred, it is difficult to determine the position of the leak point, and it is necessary to reassemble the mold to check the leak point position of the sealing strip.

[0003] Therefore, the present application provides a composite material injection forming mold and a sealing method thereof. SUMMARY

[0004] 1) Technical problem to be solved

[0005] The present application provides a composite material injection forming mold and a sealing method thereof, which solves the technical problem of difficult detection and repair of the leak point position of the sealing strip of the resin injection forming mold.

[0006] 2) Technical solution

[0007] The present application provides a composite material injection forming mold, which comprises a forming mold upper mold and a forming mold lower mold that are mutually buckled, a sealing groove is arranged on the lower mold parting surface of the forming mold lower mold, a plurality of sensor interface holes for pressure detection and sealant injection are arranged on the forming mold upper mold, the forming mold upper mold has a mold glue outlet hole, and the forming mold lower mold has a mold glue inlet hole.

[0008] The sealing groove comprises an inner boundary sealing groove, an outer boundary sealing groove and a plurality of sub-partition sealing grooves, and the two ends of each sub-partition sealing groove are respectively communicated with the inner boundary sealing groove and the outer boundary sealing groove.

[0009] Further, the plurality of sub-partition sealing grooves divide the area between the inner boundary sealing groove and the outer boundary sealing groove into a plurality of sub-enclosed areas, when the upper mold of the forming mold and the lower mold of the forming mold are closed, the sensor interface hole and its corresponding sub-enclosed area are communicated, and the projection position of the sensor interface hole is located in the sub-enclosed area.

[0010] Further, the composite injection molding mold further comprises a pressure sensor, a measuring pipeline stop valve and a vacuum source stop valve, the pressure sensor is arranged on the measuring pipeline between the measuring pipeline stop valve and the vacuum source stop valve, and the measuring pipeline is inserted into the sensor interface hole.

[0011] Further, the composite injection molding mold further comprises an industrial computer, and the industrial computer is connected with the pressure sensor.

[0012] Further, the inner boundary sealing groove and the outer boundary sealing groove are filled with a first sealing strip, and the starting end and the end of the first sealing strip are connected.

[0013] Further, the sub-partition sealing groove is filled with a second sealing strip, and the starting end and the end of the second sealing strip are connected with the corresponding first sealing strip respectively.

[0014] Further, the upper mold of the forming mold and the lower mold of the forming mold are fixedly installed through fastening bolts.

[0015] Further, the glue outlet hole of the mold is provided with a glue outlet hole stop valve, and the glue inlet hole of the mold is provided with a glue inlet hole stop valve.

[0016] The application also provides a sealing method of a composite injection molding mold, comprising the following steps:

[0017] Step 1, closing and fixedly installing the upper mold of the forming mold and the lower mold of the forming mold;

[0018] Step 2, closing the glue outlet hole stop valve, opening the glue inlet hole stop valve, connecting the glue inlet pipeline to the high-pressure gas source, and closing the vacuum source stop valve corresponding to the set N of all sub-enclosed areas; wherein the set N contains n elements;

[0019] Step 3, setting the driving pressure of the high-pressure gas source as Ps, opening the measuring pipeline stop valve corresponding to the set N of all sub-enclosed areas, after a first time period △T1, reading the value of the pressure sensor of the sub-enclosed area corresponding to each sensor interface hole;

[0020] Step 4, compare the pressure value h_Pi of each measuring pipeline with the difference |Ps-h_Pi| of the driving pressure Ps and the pressure leakage threshold h_△P, if |Ps-h_Pi|<h_△P, it is determined that the sealing strip installed in the inner boundary sealing groove or the sealing strip installed in the sub-partition sealing groove around the i-th sub-closed region has a leakage point, mark the sub-closed region with a leakage point of the surrounding sealing strip as K={K1, K2, …, Km}, remove the high-pressure gas source and restore the pressure of the mold cavity and each sub-closed region to normal pressure; wherein i∈1, 2, …, n;

[0021] Step 5, open the measuring pipeline stop valve corresponding to the set N of all sub-closed regions, and connect the vacuum source to the vacuum source stop valve of each measuring pipeline corresponding to the set N of all sub-closed regions, keep the glue outlet stop valve closed, open the glue inlet stop valve and connect the vacuum source, after a first time period △T2, close all opened vacuum source stop valves and glue inlet stop valves of the measuring pipeline, and after a second time period △T3, the pressure value of each sub-closed region pressure measuring pipeline is v_P1, v_P2…v_Pn;

[0022] Step 6, compare the pressure value v_Pi of each measuring pipeline with the difference |Pe-v_Pi| of the external environment pressure Pe and the pressure leakage threshold v_△P, if |Pe-v_Pi|<v_△P, it is determined that the sealing strip installed in the outer boundary sealing groove or the sealing strip installed in the sub-partition sealing groove around the i-th sub-closed region has a leakage point, mark the sub-closed region with a leakage point of the surrounding sealing strip as L={L1, L2, …, Lk}, remove all vacuum sources to restore the pressure of the mold cavity and each sub-closed region to normal pressure;

[0023] Step 7, compare the set K={K1, K2, …, Km} with the set L={L1, L2, …, Lk}, and select the intersection M=K∩L={M1, M2, …, Mj} of the two sets;

[0024] Step 8, remove the pressure sensor on the measuring pipeline connected to the sub-closed region corresponding to the set M, inject sealing agent into all sub-closed regions corresponding to the set M through the measuring pipeline and the sensor interface hole and keep the injection pressure for a period of time, and finally close the measuring pipeline stop valve corresponding to all sub-closed regions in the set M, after the sealing agent is completely solidified, the plugging of the sub-closed region with a leakage point is completed;

[0025] Step 9, remove the set M from the set N, use the new set composed of the remaining sub-closed regions as the updated sub-closed region set N, i.e. N=N-M, repeat step 28 until the number of sub-closed regions in the set N no longer changes.

[0026] 3) beneficial effects

[0027] In summary, the present application divides the area surrounded by the inner and outer sealing strips of the injection molding mold into several sub-enclosed areas, forms pressure difference between the mold cavity and each sub-enclosed area of the sealing groove and between each sub-enclosed area of the sealing groove and the external environment by pressing and vacuumizing, respectively, measures the deviation between the residual pressure value of each sub-enclosed area surrounded by the sealing groove and the set pressure of the mold cavity and the pressure of the external environment after a period of time, and then determines the position of the leaking sealing strip. Finally, the sub-enclosed area is injected with sealant through the pipeline, so that the leaking position can be repaired without disassembling the mold. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 is a front structure schematic diagram of a composite material injection molding mold provided by the embodiments of the present application;

[0030] Figure 2 is a back structure schematic diagram of a composite material injection molding mold provided by the embodiments of the present application;

[0031] Figure 3 is a structure schematic diagram of an upper mold of a molding mold provided by the embodiments of the present application;

[0032] Figure 4 is a structure schematic diagram of a lower mold of a molding mold provided by the embodiments of the present application;

[0033] Figure 5 is a structure schematic diagram of a pressure measurement pipeline of a composite material injection molding mold provided by the embodiments of the present application.

[0034] In the drawings:

[0035] 1-upper mold of a molding mold; 2-lower mold of a molding mold; 3-fixing bolt hole; 4-mold glue outlet hole; 5-sensor interface hole; 6-mold glue inlet hole; 7-parting surface of the upper mold of the molding mold; 8-parting surface of the lower mold of the molding mold; 9-inner boundary sealing groove; 10-outer boundary sealing groove; 11-sub-partition sealing groove; 12-projection position of the parting surface of the sensor interface hole; 13-projection position of the mold glue outlet hole cavity surface; 14-cavity surface of the lower mold of the molding mold; 15-pressure sensor; 16-measurement pipeline stop valve; 17-vacuum source stop valve; 18-mold cavity. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Figure 1 This is a schematic diagram of the structure of a composite material injection molding die provided in an embodiment of the present invention, as shown below. Figures 1-4 As shown, the molding die may include an upper molding die 1 and a lower molding die 2 that interlock with each other. The lower parting surface 8 of the lower molding die 2 is provided with a sealing groove. The upper molding die 1 has multiple sensor interface holes 5 for pressure detection and sealant injection. The upper molding die 1 has a mold discharge hole 4, and the lower molding die 1 has a mold injection hole 6.

[0041] The sealing groove includes an inner boundary sealing groove 9, an outer boundary sealing groove 10, and multiple sub-section sealing grooves 11. Both ends of each sub-section sealing groove 11 are connected to the inner boundary sealing groove 9 and the outer boundary sealing groove 11, respectively.

[0042] In the above embodiment, the sealing groove is not arranged on the parting surface 7 of the upper mold, and the sealing area surrounded by the inner boundary sealing groove 9 and the outer boundary sealing groove 10 is divided into a plurality of sub-enclosed areas by the sub-partition sealing groove 11. The location of the leakage point can be found more quickly and accurately by judging the pressure value in the sub-enclosed area, and the leakage point does not need to be checked by disassembling the mold. At the same time, the sensor interface hole 5 can realize leakage point detection and injection of the sealing agent into the mold for repairing the leakage point without disassembling the mold.

[0043] As an optional embodiment, as shown in Figure 4 The area between the inner boundary sealing groove 9 and the outer boundary sealing groove 10 is divided into a plurality of sub-enclosed areas by the sub-partition sealing groove 11. When the upper mold 1 and the lower mold 2 of the mold are closed, the sensor interface hole 5 is in communication with the corresponding sub-enclosed area, and the projection position of the sensor interface hole 5 is located in the sub-enclosed area.

[0044] Specifically, by dividing the sub-enclosed area, the pressure of each sub-enclosed area can be obtained by the corresponding pressure sensor, so that the location of the leakage point of the sealing strip can be accurately found. The sealing agent can be injected into the sub-enclosed area with the leakage point through the sensor interface hole 5, so that the location of the leakage point can be repaired without disassembling the mold.

[0045] As an optional embodiment, as shown in Figure 5 The composite injection molding mold further comprises a pressure sensor 15, a measurement pipeline stop valve 16 and a vacuum source stop valve 17. The pressure sensor 15 is arranged on the measurement pipeline between the measurement pipeline stop valve 16 and the vacuum source stop valve 17, and the measurement pipeline is inserted into the sensor interface hole 5.

[0046] Specifically, the pressure value of each sub-enclosed area can be detected in sequence by the pressure sensor 15, and the location of the leakage point can be determined by comparison. The measurement pipeline is connected with the vacuum source. The pressure sensor measures the pressure value in the measurement pipeline. One end of the measurement pipeline is connected with the enclosed area, and the other end is connected with the vacuum source. There is a vacuum source stop valve between the pressure sensor and the vacuum source. When measuring the set K for the first time, all the measurement pipeline stop valves are closed to cut off the vacuum source, and the vacuum source does not participate. The measurement is the positive pressure air in the pipeline. The vacuum source is used when measuring the set L for the second time, and the measurement is the negative pressure air in the pipeline. Finally, the sealing agent is injected through the pipeline to seal the enclosed area with the leakage point.

[0047] As an optional implementation, the composite injection molding mold further comprises an industrial computer connected with the pressure sensor 15. The industrial computer controls the pressure sensor 15, and the corresponding pressure data obtained by the pressure sensor 15 is used to determine whether there is a leak in each sealing area.

[0048] As an optional implementation, the inner boundary sealing groove 9 and the outer boundary sealing groove 10 are filled with first sealing strips, and the starting end and the end of the first sealing strips are connected.

[0049] The inner boundary sealing groove 9 and the outer boundary sealing groove 10 on the lower mold parting surface 8 of the molding mold are filled with silicone rubber sealing strips, and the starting end and the end of the sealing strips in the inner boundary sealing groove 9 and the outer boundary sealing groove 10 are connected by silicone rubber adhesive.

[0050] As an optional implementation, the sub-partition sealing groove 11 is filled with a second sealing strip, and the starting end and the end of the second sealing strip are connected with the corresponding first sealing strip.

[0051] The sub-partition sealing groove 11 on the lower mold parting surface 8 of the molding mold is filled with a silicone rubber sealing strip, the starting end and the end of the sealing strip in the sub-partition sealing groove 11 are connected with the sealing strips in the inner boundary sealing groove 9 and the outer boundary sealing groove 10, and silicone rubber adhesive is applied between the contact surfaces of the sealing strips.

[0052] As an optional implementation, the upper mold 1 of the molding mold and the lower mold 2 of the molding mold are fixedly installed by fastening bolts. Specifically, the upper mold 1 of the molding mold and the lower mold 2 of the molding mold are closed, and the fastening bolts are installed in the fastening bolt holes 3.

[0053] As an optional implementation, a glue outlet hole stop valve is installed at the glue outlet hole 4 of the mold, and a glue inlet hole stop valve is installed at the glue inlet hole 6 of the mold. The glue inlet hole stop valve and the glue outlet hole stop valve are used to control the glue inlet and glue outlet process of the injection molding mold.

[0054] The embodiment of the present application also provides a sealing method of a composite injection molding mold, comprising the following steps:

[0055] Step 1, closing and fixedly installing the upper mold 1 of the molding mold and the lower mold 2 of the molding mold;

[0056] Step 2, closing the glue outlet hole stop valve, opening the glue inlet hole stop valve, connecting the glue inlet pipeline to the high-pressure gas source, and closing the vacuum source stop valve 17 corresponding to the set N of all sub-closed areas; the set N contains n elements.

[0057] Step 3, set the driving pressure of the high-pressure gas source as Ps, open the measuring pipeline stop valve 16 corresponding to the set N of all sub-enclosed areas, after a first time period AT1, read the value of the pressure sensor 15 of the sub-enclosed area corresponding to each sensor interface hole 5;

[0058] Step 4, compare the difference |Ps-h_Pi| between the pressure value h_Pi (i∈1, 2, …, n) of each measuring pipeline and the driving pressure Ps with the pressure leakage threshold h_△P, if |Ps-h_Pi|<h_△P, it is determined that the sealing strip installed in the inner boundary sealing groove 9 around the i-th sub-enclosed area or the sealing strip installed in the sub-partition sealing groove 11 has a leakage point, mark the sub-enclosed area with a leakage point of the surrounding sealing strip, recorded as a set K={K1, K2, …, Km}, remove the high-pressure gas source and restore the pressure of the mold cavity 18 and each sub-enclosed area to normal pressure;

[0059] Step 5, open the measuring pipeline stop valve 16 corresponding to the set N of all sub-enclosed areas, and open the vacuum source stop valve 17 of each measuring pipeline corresponding to the set N of all sub-enclosed areas to connect with the vacuum source, keep the glue outlet stop valve closed, open the glue inlet stop valve and connect the vacuum source, after a first time period AT2, close all the opened measuring pipeline vacuum source stop valve 17 and glue inlet stop valve, and after a second time period AT3, the pressure value of each sub-enclosed area pressure measuring pipeline is v_P1, v_P2…v_Pn;

[0060] Step 6, compare the difference |Pe-v_Pi| between the pressure value v_Pi (i∈1, 2, …, n) of each measuring pipeline and the ambient pressure Pe with the pressure leakage threshold v_△P, if |Pe-v_Pi|<v_△P, it is determined that the sealing strip installed in the outer boundary sealing groove 10 around the i-th sub-enclosed area or the sealing strip installed in the sub-partition sealing groove 11 has a leakage point, mark the sub-enclosed area with a leakage point of the surrounding sealing strip, recorded as a set L={L1, L2, …, Lk}, remove all vacuum sources to restore the pressure of the mold cavity 18 and each sub-enclosed area to normal pressure;

[0061] Step 7, compare the set K={K1, K2, …, Km} with the set L={L1, L2, …, Lk}, and select the intersection M=K∩L={M1, M2, …, Mj} of the two sets;

[0062] Step 8, remove the pressure sensor 15 connected to the measuring pipeline of the sub-enclosed area corresponding to the set M, inject sealing agent into all sub-enclosed areas corresponding to the set M through the measuring pipeline and the sensor interface hole 5 and keep the injection pressure for a period of time, finally close the measuring pipeline stop valve 16 corresponding to all sub-enclosed areas in the set M, after the sealing agent is completely solidified, the plugging of the sub-enclosed area with a leakage point is completed.

[0063] Step 9, remove set M from set N, and the new set of remaining sub-enclosed regions is the updated sub-enclosed region set N, i.e. N=N-M, repeat step 27 until the number of sub-enclosed regions in set N no longer changes, then all leak points of the molding mold sealing strip are blocked, and the next injection process can be performed.

[0064] It should be noted that each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment mainly describes the difference from other embodiments. The application is not limited to the specific steps and structures described above and shown in the drawings. Moreover, for the sake of brevity, detailed descriptions of known methods and techniques are omitted.

[0065] The above is only an embodiment of the present application, and is not limited to the present application. The present application can have various modifications and changes for those skilled in the art without departing from the scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A composite injection molding mold characterized by, The application relates to a sealing groove for a molding die, which comprises a mutual interlocking molding die upper die (1) and a molding die lower die (2), wherein a lower die parting surface (8) of the molding die lower die (2) is provided with a sealing groove, a plurality of sensor interface holes (5) for pressure detection and sealant injection are formed in the molding die upper die (1), the molding die upper die (1) is provided with a die glue outlet hole (4), the molding die lower die (2) is provided with a die glue inlet hole (6), and the sealing groove comprises an inner boundary sealing groove (9), an outer boundary sealing groove (10) and a plurality of sub-partition sealing grooves (11). The two ends of each of the sub-partition sealing grooves (11) are respectively communicated with the inner boundary sealing groove (9) and the outer boundary sealing groove (10). The plurality of sub-partition sealing grooves (11) divide the region between the inner boundary sealing groove (9) and the outer boundary sealing groove (10) into a plurality of sub-closed regions, the sensor interface hole (5) is communicated with the corresponding sub-closed region after the molding die upper die (1) and the molding die lower die (2) are closed, and the projection position of the sensor interface hole (5) is located in the sub-closed region. The application further comprises a pressure sensor (15), a measuring pipeline stop valve (16) and a vacuum source stop valve (17), the pressure sensor (15) is arranged on a measuring pipeline between the measuring pipeline stop valve (16) and the vacuum source stop valve (17), and the measuring pipeline is inserted into the sensor interface hole (5).

2. The composite injection molding mold of claim 1, wherein, The application further comprises an industrial computer, and the industrial computer is connected with the pressure sensor (15).

3. The composite injection molding mold of claim 1, wherein, The inner boundary sealing groove (9) and the outer boundary sealing groove (10) are filled with first sealing strips, and the starting end and the terminal end of the first sealing strip are connected.

4. The composite injection molding mold of claim 3, wherein, The sub-partition sealing grooves (11) are filled with second sealing strips, and the starting end and the terminal end of the second sealing strip are respectively connected with the corresponding first sealing strip.

5. The composite injection molding mold of claim 1, wherein, The molding die upper die (1) and the molding die lower die (2) are fixedly installed through fastening bolts.

6. The composite material injection molding mold according to claim 1, wherein A die glue outlet hole stop valve is arranged at the die glue outlet hole (4), and a die glue inlet hole stop valve is arranged at the die glue inlet hole (6).

7. A method of sealing a composite injection molding mold as defined in claim 1, wherein, The method comprises the following steps: Step 1, closing and fixedly installing the molding die upper die (1) and the molding die lower die (2); Step 2, closing the die glue outlet hole stop valve, opening the die glue inlet hole stop valve, connecting a glue inlet pipeline to a high-pressure gas source, and closing the vacuum source stop valve (17) corresponding to a set N of all sub-closed regions; wherein the set N contains n elements; Step 3, setting the driving pressure of the high-pressure gas source as Ps, opening the measuring pipeline stop valve (16) corresponding to the set N of all sub-closed regions, reading the value of the pressure sensor (15) of the sub-closed region corresponding to each sensor interface hole (5) after a first time period Delta T1. Step 4, compare the pressure value h_Pi of each measuring pipeline with the difference |Ps-h_Pi| of the driving pressure Ps and the pressure leakage threshold h_△P, if |Ps-h_Pi|<h_△P, it is determined that the sealing strip installed in the inner boundary sealing groove (9) around the i-th sub-enclosed area or the sealing strip installed in the sub-partition sealing groove (11) has a leakage point, mark the sub-enclosed area with a leakage point around the sealing strip as a set K={K1, K2, …, Km}, remove the high-pressure gas source and restore the pressure of the mold cavity (18) and each sub-enclosed area to normal pressure; wherein i∈1, 2, …, n; Step 5, open the measuring pipeline stop valve (16) corresponding to the set N of all sub-enclosed areas, and open the vacuum source stop valve (17) of each measuring pipeline corresponding to the set N of all sub-enclosed areas to connect with the vacuum source, keep the glue outlet stop valve closed, open the glue inlet stop valve and connect the vacuum source, after a first time period △T2, close all opened vacuum source stop valves (17) and glue inlet stop valves of the measuring pipeline, and after a second time period △T3, the pressure value of each sub-enclosed area pressure measuring pipeline is v_P1, v_P2…v_Pn; Step 6, compare the pressure value v_Pi of each measuring pipeline with the difference |Pe-v_Pi| of the ambient pressure Pe and the pressure leakage threshold v_△P, if |Pe-v_Pi|<v_△P, it is determined that the sealing strip installed in the outer boundary sealing groove (10) around the i-th sub-enclosed area or the sealing strip installed in the sub-partition sealing groove (11) has a leakage point, mark the sub-enclosed area with a leakage point around the sealing strip as a set L={L1, L2, …, Lk}, remove all vacuum sources to restore the pressure of the mold cavity (18) and each sub-enclosed area to normal pressure; Step 7, compare the set K={K1, K2, …, Km} with the set L={L1, L2, …, Lk}, and select the intersection M=K∩L={M1, M2, …, Mj} of the two sets; Step 8, remove the pressure sensor (15) connected to the measuring pipeline of the sub-enclosed area corresponding to the set M, inject sealing agent into all sub-enclosed areas corresponding to the set M through the measuring pipeline and the sensor interface hole (5) and keep the injection pressure for a period of time, and finally close the measuring pipeline stop valve (16) corresponding to all sub-enclosed areas in the set M, after the sealing agent is completely solidified, the plugging of the sub-enclosed area with a leakage point is completed; Step 9, remove the set M from the set N, use the new set composed of the remaining sub-enclosed areas as the updated sub-enclosed area set N, that is, N=N-M, repeat steps 2-8 until the number of sub-enclosed areas in the set N no longer changes.

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