A mold assembly and a mold pressing forming process for a middle and heavy truck integrated spoiler

Abstract

The application discloses a die assembly of a middle-heavy truck integrated spoiler, which comprises an upper die, a lower die and a driving assembly for driving the upper die and the lower die to close to form a cavity, the cavity comprises a material laying cavity and a placing cavity communicated with one side of the material laying cavity, and a material laying gap is arranged between the top surface and the bottom surface of the material laying cavity and the placing cavity. The application further discloses a die pressing process of the middle-heavy truck integrated spoiler. The die assembly and the die pressing forming process of the middle-heavy truck integrated spoiler are characterized in that SMC sheets and rubber with holes are respectively placed in the material laying cavity and the placing cavity, so that resin is filled into the holes during die pressing production, the SMC and the rubber are integrally connected, the structural strength is guaranteed, and the spoiler is prepared. The die assembly and the die pressing forming process not only simplify product production procedures, reduce production cost, but also guarantee the corrosion resistance of the product and prolong the service life of the spoiler.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts production, and in particular to a mold assembly and a mold pressing forming process for a middle and heavy truck integrated spoiler. BACKGROUND

[0002] The spoiler of a middle and heavy truck, i.e. a wind deflector, is usually arranged between a cab and a chassis to reduce the wind resistance when the truck is running.

[0003] In the prior art, a top spoiler mainly consists of a metal framework and a rubber wind deflector, and the two are fixedly connected by push pins. The metal framework is a rigid member and is connected to the cab, and the rubber wind deflector is an elastic member and is connected to the chassis. When produced in the above manner, the production cost is increased due to the need of push pins to connect the metal framework and the rubber wind deflector. In addition, the metal framework and the rubber wind deflector are connected in a split type, and the connection strength of the product is limited. With the increase of the use time, the top spoiler exposed to the outside is affected by external environmental factors (such as sun exposure, wind blowing, rain, etc.), and is prone to looseness, thereby shortening the service life.

[0004] Therefore, it is necessary to provide a spoiler production device and a production process which simplify the production process, reduce the cost and ensure the product quality. SUMMARY

[0005] The present application aims to overcome the defects in the prior art, and to provide a mold assembly and a mold pressing forming process for a middle and heavy truck integrated spoiler which simplify the production process, reduce the cost, ensure the connection strength, improve the corrosion resistance of the product and prolong the service life of the product.

[0006] To solve the above technical problems, the present application provides a mold assembly for a middle and heavy truck integrated spoiler, which comprises an upper mold, a lower mold and a driving assembly for driving the upper mold and the lower mold to close to form a cavity. The cavity comprises a laying cavity and a placing cavity connected to one side of the laying cavity. The top surface and the bottom surface of the laying cavity are both provided with a laying gap with the placing cavity.

[0007] Preferably, in order to ensure the uniform flow of resin in the placing cavity during production and to ensure the strength of the connection between the rubber and the SMC, the bottom surface of the placing cavity is an arc surface protruding towards the upper mold.

[0008] Preferably, in order to facilitate the discharge of air in the cavity after closing, the upper mold and the lower mold forming the cavity are provided with a closing gap therebetween, and the closing gap is communicated with the cavity.

[0009] Preferably, in order to facilitate the discharge of air in the cavity and to increase the structural strength, a negative pressure channel is provided on the upper mold and / or the lower mold. The air inlet end of the negative pressure channel is communicated with the gap, and the air outlet end is used to communicate with a negative pressure device.

[0010] Preferably, in order to ensure that most of the air in the rubber through hole is discharged during the molding process, and to improve the strength of the connecting part between the SMC plate and the rubber in the finished product, the air inlet end is arranged adjacent to the placement cavity.

[0011] Preferably, in order to prevent the negative pressure channel from being blocked by the cured resin during the exhaust process, the air inlet end is provided with a negative pressure plate, and the negative pressure plate is densely provided with mesh holes communicating with the negative pressure channel.

[0012] Preferably, in order to facilitate positioning of the placed rubber plate, the bottom surface of the placement cavity is arranged below the lower mold parting surface.

[0013] Preferably, in order to increase the height difference between the SMC and the rubber, facilitate the downward flow of the resin under the action of gravity during the molding process, and facilitate contact with the rubber, a mold core is arranged on the lower mold, the cavity wall of the material laying cavity includes the top wall and the peripheral side wall of the mold core, and the top wall of the mold core is arranged above the side of the placement cavity.

[0014] Preferably, in order to facilitate positioning of the rubber, a material pressing block is arranged directly above the placement cavity, and the material pressing block is arranged on the side adjacent to the lower mold of the upper mold through a telescopic member.

[0015] Preferably, in order to strengthen the positioning effect of the rubber, the bottom surface of the material pressing block is provided with anti-slip protrusions.

[0016] To solve the above technical problems, the present application also provides a molding process for a medium-heavy truck integrated spoiler, comprising the following steps:

[0017] S10: preparing an elastic member with a through hole;

[0018] S20: placing the elastic member on the lower mold, and maintaining a material laying gap between the through hole and the top surface of the lower mold along the axial center line direction of the through hole;

[0019] S30: laying multiple layers of sheet material impregnated with thermosetting resin on the lower mold, so that the sheet material covers the orifices at both ends of the through hole;

[0020] S40: closing the mold, and molding the sheet material to make the thermosetting resin flow into the through hole and be thermally cured;

[0021] S50: opening the mold, and taking out the product.

[0022] In summary, the mold assembly and the mold pressing forming process of the heavy truck integrated spoiler in the present application compared with the prior art, by putting SMC sheet and rubber with holes in the laying cavity and the placement cavity respectively, the resin fills into the holes during mold pressing production, realizing the integrated connection of SMC and rubber, ensuring the structural strength, to produce the spoiler, not only simplifying the product production process, reducing the production cost, but also ensuring the corrosion resistance of the product, prolonging the service life of the spoiler. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

[0024] Figure 2 is a structural schematic diagram of the present application in the closed die state;

[0025] Figure 3 is a top view of Figure 2 ;

[0026] Figure 4 is an A-A cross-sectional view of Figure 3 ;

[0027] Figure 5 is an enlarged view of A part of Figure 1 ;

[0028] Figure 6 is an exploded schematic diagram of Figure 1 ;

[0029] Figure 7 is a structural schematic diagram of the lower die of the present application;

[0030] Figure 8 is a structural schematic diagram of the product produced using the present application;

[0031] Figure 9 is a process flow chart of the present application;

[0032] In the figure: 1. upper die, 2. lower die, 2-1. top hole, 3. cavity, 3a. laying cavity, 3b. placement cavity, 4. gap, 5. negative pressure channel, 6. negative pressure plate, 7. mold core, 8. pressing block, 8a. anti-slip protrusion, 9. telescopic part, 10. guide sleeve, 11. guide column, 12. guide rod, 13. hydraulic cylinder, 14. ejector pin, 15. air cylinder, 16. base, 17. top plate, 18. rubber plate, 18-1. hole, 19. SMC plate. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0034] AsFigures 1-7 As shown, the mold assembly of the medium and heavy truck integrated spoiler of the present application, the base 16 and the top plate 17 arranged in parallel above the base 16, the four corners of the base 16 are fixedly connected with the four corners of the top plate 17 through four guide columns 11; the lower mold 2 is fixed on the base 16, the driving assembly for driving the upper mold 1 and the lower mold 2 to close to form the cavity 3 is arranged on the top plate 17, the driving assembly includes a hydraulic cylinder 13, the cylinder barrel of the hydraulic cylinder 13 is fixed on the top plate 17, the piston rod is arranged in the vertical direction and is fixedly connected with the upper mold 1 facing the lower mold 2, the upper mold 1 and the lower mold 2 form the cavity 3; the hydraulic cylinder 13 drives the upper mold 1 to move along the distribution direction of the upper mold 1 and the lower mold 2 (i.e. parallel to the axial direction of the guide column 11, which is the closing direction), the cavity 3 includes a laying cavity 3a and a placing cavity 3b communicated with one side of the laying cavity 3a, the top surface and the bottom surface of the laying cavity 3a are both provided with a laying gap between the placing cavity 3b; the lower mold 2 is provided with a step, the cavity wall of the placing cavity 3b includes the side surface and the bottom surface of the lower mold 2, the bottom surface of the step is the bottom surface of the placing cavity 3b, which is an arc surface protruding towards the upper mold 1, and the bottom surface of the placing cavity 3b is arranged below the parting surface of the lower mold 2; the four corners of the upper mold 1 are respectively provided with a guide sleeve 10 in sliding fit with the four guide columns 11.

[0035] When the mold assembly is used, the upper mold 1 is driven by the hydraulic cylinder 13 (as an alternative with similar effects, the driving assembly can also be other lifting mechanisms such as motor screw structure or air cylinder, etc.) to move upwards, the rubber plate 18 is laid on the step of the lower mold 2, so that one side of the rubber plate 18 abuts against the side surface of the step and the through hole 18-1 on the rubber plate 18 is located above the side of the bottom surface of the step, realizing the positioning of the rubber plate 18, then the SMC sheet is laid on the lower mold 2, ensuring that the projection of the through hole 18-1 on the horizontal plane is located within the projection of the SMC sheet on the horizontal plane, then the hydraulic cylinder 13 drives the upper mold 1 to move downwards and closes with the lower mold 2, so that the upper mold 1 and the lower mold 2 form the cavity 3, at this time part of the rubber plate 18 is located in the placing cavity 3b, and the SMC sheet is located in the laying cavity 3a.

[0036] When the mold pressing is performed, the upper mold 1 and the lower mold 2 jointly extrude the laid SMC sheet, the resin flows along the SMC sheet and is affected by the gravity, flows into the through hole 18-1 of the rubber plate 18 from top to bottom, and the external heating device (not shown in the figure) heats the upper mold 1 and the lower mold 2, so that heat is transferred to the resin, and the resin in the through hole 18-1 is solidified and formed by heating. After that, the upper mold 1 is separated from the lower mold 2, and the product in the cavity 3 can be taken out. In the product, the rubber plate 18 is filled with the resin which flows and solidifies by heating, and the SMC sheet is solidified into an SMC plate by heating, so that the rubber plate 18 and the SMC plate 19 are integrally connected (such as Figure 8The rubber plate 18 is placed in the placing cavity 3b of the upper die 1, and the SMC plate 19 is placed on the rubber plate 18, and then the upper die 1 and the lower die 2 are closed to form a mold cavity 3, and the resin in the SMC plate 19 is cured to form a spoiler product. Compared with the prior art in which a push pin is used to connect the metal framework and the rubber wind shield, this method does not require the use of a push pin, saves costs, simplifies the production process, and the product is free of metal components, has enhanced corrosion resistance, thereby prolonging the service life of the product.

[0037] In the mold assembly, the bottom surface of the placing cavity 3b is an arc surface protruding towards the upper die 1. With this structure, after the SMC sheet is laid, it is beneficial for the resin to flow from the high center of the rubber plate 18 to the low ends, and then the resin uniformly flows into the through hole 18-1, so as to ensure the stability of the spoiler structure after curing and forming.

[0038] As shown in Figure 4 and Figure 5 The upper die 1 and the lower die 2 surrounding the forming cavity 3 are provided with a closing gap 4, and the closing gap 4 is communicated with the forming cavity 3. The lower die 2 is provided with a negative pressure channel 5, the air inlet end of the negative pressure channel 5 is communicated with the closing gap 4 and is closely arranged with the placing cavity 3b, and the air outlet end is used to communicate with a negative pressure device. The air inlet end of the negative pressure channel 5 is further provided with a negative pressure plate 6, and the negative pressure plate 6 is densely provided with mesh holes communicated with the negative pressure channel 5.

[0039] In the mold pressing production process, the air outlet end of the negative pressure channel 5 is communicated with the negative pressure device, and from the closing of the upper die 1 and the lower die 2 to the opening of the upper die 1 and the lower die 2, the negative pressure device keeps running to exhaust air, so that when the mold is closed, the air flow is promoted. The air flow is divided into two parts, the first part, the air between the parting surface of the upper die 1 and the parting surface of the lower die 2, the air in the through hole 18-1 of the rubber plate 18, and the air produced when the resin solidification occurs, flows from the forming cavity 3 to the air inlet end of the negative pressure channel 5, and is discharged from the air outlet end of the negative pressure channel 5, in the process, the resin in the SMC sheet is filled into the through hole 18-1 of the rubber plate 18, so that the resin in this part is solidified, and the rubber plate 18 and the SMC plate 19 are integrally connected; and the second part, the external air enters from the part communicated with the outside of the closing gap 4, flows along the closing gap 4, and then enters the negative pressure channel 5 from the air inlet end. After the flow of this part of air, the flow of the first part of air is blocked to completely fill the closing gap 4 with resin, so that the resin filled in the closing gap 4 is difficult to solidify after the upper die 1 and the lower die 2 are separated, that is, through the flow of this part of air, the resin is prevented from filling the closing gap 4 and solidifying, thereby facilitating the separation of the upper die 1 and the lower die 2.

[0040] The air inlet end of the negative pressure channel 5 is arranged close to the placing cavity 3b, which can reduce the path length of the air in the mold from the cavity 3 to the negative pressure channel 5, thereby facilitating the air exhaust, reducing the air content in the resin curing in the through hole 18-1, strengthening the connection strength between the rubber plate 18 and the SMC plate, thereby improving the product quality, and also reducing the power consumption of the negative pressure device to achieve energy saving. On the other hand, the path length of the external air flowing into the negative pressure channel 5 is extended to reduce the resin content flowing into the mold gap 4 and curing, thereby facilitating the separation of the upper mold 1 and the lower mold 2. The dense mesh on the negative pressure plate 6 can promote air circulation and prevent cured resin from blocking the negative pressure channel 5, causing the air in the mold to be unable to be smoothly exhausted, thereby reducing the product quality. It should be noted that as an alternative with similar effects, the negative pressure channel 5 can also be arranged on the upper mold 1.

[0041] As shown in Figure 2 , Figure 4 and Figure 7 , the lower mold 2 is provided with a mold core 7, the cavity wall of the material laying cavity 3a includes the top wall and the peripheral side wall of the mold core 7, and the top wall of the mold core 7 is arranged above the side of the placing cavity 3b. With this design, the laying height of the SMC sheet can be increased, thereby increasing the height difference between the SMC sheet and the rubber plate 18, promoting the resin to flow downward into the through hole 18-1 of the rubber plate 18 under the action of gravity during the mold pressing production, and then curing and forming to obtain the product as shown in Figure 8 .

[0042] As shown in Figure 6 and Figure 7 , the lower mold 2 is further provided with a top hole 2-1, the top hole 2-1 is slidingly fitted with a top rod 14, and the base 16 is provided with a gas cylinder 15, the cylinder barrel of the gas cylinder 15 is fixedly connected with the base 16, and the piston rod is fixedly connected with the top rod 14.

[0043] After the upper mold 1 and the lower mold 2 are separated, the gas cylinder 15 operates, and the piston rod drives the top rod 14 to move upward, thereby lifting the SMC plate 19 of the product upward, thereby facilitating the taking out of the product. Since the bottom surface of the placing cavity 3b is an arc surface protruding towards the upper mold 1, in the formed product, the inner surface faces the lower mold 2, and the outer surface faces the upper mold 1; after the top rod 14 contacts the inner surface of the product, the top rod mark is left on the inner surface of the product, thereby avoiding affecting the outer surface of the product, thereby ensuring the appearance effect of the product on the basis of facilitating the taking out of the product.

[0044] As shown in Figure 5 and Figure 6As shown, a pressing block 8 is arranged between the upper die 1 and the top of the placing cavity 3b, and the pressing block 8 is in sliding fit with the upper die 1 along the distribution direction of the upper die 1 and the lower die 2, and an elastic expansion piece 9 is arranged between the pressing block 8 and the upper die 1, and the expansion piece 9 is a spring; the bottom surface of the pressing block 8 is provided with an anti-skid protrusion 8a; the top surface of the pressing block 8 is fixedly connected with a guide rod 12 extending in the vertical direction, and the upper die 1 is provided with a guide hole, and the guide rod 12 is in sliding fit with the upper die 1 through the guide hole.

[0045] After the above structure is adopted, when the mold is closed, the pressing block 8 can be in contact with the rubber plate 18 on the bottom surface of the placing cavity 3b in advance, and the pressing block 8 can lock the rubber plate 18 on the bottom surface of the placing cavity 3b through the elastic force of the spring, so as to prevent the rubber plate 18 from sliding and deviating in the production process and affecting the product quality. Through the anti-skid protrusion 8a, the friction between the pressing block 8 and the rubber plate 18 can be increased, and the locking effect can be further enhanced; and through the close sliding fit of the guide hole and the guide rod 12, the sliding direction of the pressing block 8 is fixed, and deviation of the pressing block 8 in the horizontal direction is prevented. It should be noted that the anti-skid protrusion 8a on the bottom surface of the pressing block 8 can also be provided in the form of a pattern with different shapes, and the depth is 0.05 mm. By adopting this mode, the pattern can be formed on the rubber plate 18, which not only realizes the anti-skid locking of the rubber plate 18, but also does not need to perform additional decoration and beautification processing on the rubber plate 18 of the product, reduces the processing procedures, and improves the production efficiency.

[0046] As shown in the drawings, Figure 9 The present application also discloses a mold pressing forming process of the medium-heavy truck integrated spoiler, which comprises the following steps:

[0047] S10: preparing an elastic piece with a through hole;

[0048] S20: placing the elastic piece on the lower die, and keeping the through hole in the axial line direction of the through hole and the top surface of the lower die with a laying gap;

[0049] S30: laying multiple layers of sheets soaked with thermosetting resin on the lower die, so that the sheets cover the orifices at both ends of the through hole;

[0050] S40: closing the mold, and pressing the sheets, so that the thermosetting resin flows into the through hole and is thermoset;

[0051] S50: opening the mold, and taking out the product.

[0052] In order to ensure the product quality obtained according to the above process, the present application provides the following examples for analysis and comparison:

[0053] Example 1

[0054] The mold pressing forming process of the medium-heavy truck integrated spoiler in Example 1 comprises the following steps:

[0055] (10) Prepare the elastic member with a through hole, which is an EPDM rubber plate in strip shape, with a thickness of 4 mm;

[0056] (20) Place the elastic member on the lower mold, and keep the through hole along its axial line direction and the top surface of the lower mold with a paving gap, so that the paving gap length below the elastic member is 2 mm;

[0057] (30) Lay multiple layers of SMC sheets soaked with thermosetting resin on the lower mold, so that the SMC sheets cover the orifices at both ends of the through hole, and the paving gap length above the elastic member is 2 mm;

[0058] (40) Close the mold, and mold the SMC sheets, so that the thermosetting resin flows into the through hole and is heat-cured, wherein the heating temperature is 140°C, the holding pressure time is 4 min, and the molding pressure is 100 MPa;

[0059] (50) Open the mold, and take out the product.

[0060] Example 2

[0061] The molding process of the medium-heavy truck integrated spoiler of Example 2 is based on Example 1, with the following differences:

[0062] (d1) The thickness of the elastic member is 3 mm;

[0063] (d2) The paving thickness above and below the elastic member is 1.5 mm;

[0064] (d3) During molding, the heating temperature is 135°C, the holding pressure time is 3.5 min, and the molding pressure is 90 MPa.

[0065] Example 3

[0066] The molding process of the medium-heavy truck integrated spoiler of Example 3 is based on Example 1, with the following differences:

[0067] (d1) The thickness of the elastic member is 2.5 mm;

[0068] (d2) The paving thickness above and below the elastic member is 1 mm;

[0069] (d3) During molding, the heating temperature is 130°C, the holding pressure time is 3.5 min, and the molding pressure is 80 MPa.

[0070] Example 4

[0071] The molding process of the medium-heavy truck integrated spoiler of Example 4 is based on Example 1, with the following differences:

[0072] (d1) The thickness of the elastic member is 4.5 mm;

[0073] (d2) The thickness of the material laid above and below the elastic member is 3mm;

[0074] (d3) The heating temperature during molding is 145℃, the holding time is 3.5min, and the molding pressure is 110MPa.

[0075] Example 5

[0076] The molding process of the integrated spoiler for medium and heavy trucks of Example 5 is based on Example 1, with the difference being that:

[0077] (d1) The thickness of the elastic member is 2mm;

[0078] (d2) The thickness of the material laid above and below the elastic member is 1mm.

[0079] Example 6

[0080] The molding process of the integrated spoiler for medium and heavy trucks of Example 6 is based on Example 2, with the difference being that:

[0081] (d1) The holding time during molding is 4min.

[0082] Example 7

[0083] The molding process of the integrated spoiler for medium and heavy trucks of Example 7 is based on Example 4, with the difference being that:

[0084] (d1) The molding pressure during molding is 80MPa.

[0085] Example 8

[0086] The molding process of the integrated spoiler for medium and heavy trucks of Example 8 is based on Example 2, with the difference being that:

[0087] (d1) The molding pressure during molding is 120MPa.

[0088] The products obtained according to the processes in Examples 1-8 are respectively tested, and the comparison data are shown in the following table:

[0089]

[0090] Before comparing the various data, it needs to be explained that the main influence after the EPDM rubber elastic member is placed in the mold is the aging caused by secondary heating, and high temperature and long time are the main factors that accelerate the aging of EPDM rubber. After aging, the hardness of EPDM will increase, therefore, in order to ensure the long-term normal use of the elastic member, the change rate of EPDM tensile strength, i.e. the increase rate of EPDM hardness, is controlled to be below 10%.

[0091] The various data in the above table are compared:

[0092] (1) According to the control examples 1-8, the thickness of the EPDM rubber elastic member is controlled within 2-5 mm, the thickness of the SMC sheet is controlled within 2-4 mm, the heating temperature during the molding is controlled within 130-150°C, the molding pressure is controlled within 80-120 MPa, and the sum of the thickness (mm) of the elastic member and the fixed value 2 after the thickness (mm) of the sheet is subtracted is equal to the holding time (min), which can ensure that the detection parameters of the spoiler product reach the qualified index;

[0093] (2) According to the control example 1 and example 5, the thickness of the elastic member and the thickness of the SMC sheet are too low, which can easily reduce the resin filling rate in the through hole of the elastic member, thereby reducing the product quality, and the reason is that the product is too thin to be embedded, and correspondingly, if the product is too thick, the curing time will be prolonged, which can cause the EPDM to be deformed or aged after being heated too much;

[0094] (3) According to the control example 2 and example 6, the holding time is prolonged in the example 6, which can cause the EPDM to be deformed and aged after being heated too much, thereby increasing the tensile strength change rate of the elastic member and reducing the product quality;

[0095] (4) According to the control example 4 and example 7, the molding pressure is reduced in the example 7, which can cause the resin to be difficult to completely fill the through hole in the elastic member during the molding process, thereby reducing the resin filling rate in the final product and reducing the tensile strength of the SMC after curing.

[0096] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A mold assembly for a middle-heavy truck integrated spoiler, comprising an upper mold (1), a lower mold (2) and a driving assembly for driving the upper mold (1) and the lower mold (2) to close to enclose a mold cavity (3), characterized in that : The cavity (3) comprises a laying cavity (3a) and a placing cavity (3b) communicated with one side of the laying cavity (3a), and laying gaps are arranged between the top surface and the bottom surface of the laying cavity (3a) and the placing cavity (3b); the bottom surface of the placing cavity (3b) is an arc surface protruding towards the upper die (1); a clamping gap (4) is arranged between the upper die (1) and the lower die (2) surrounding the cavity (3), and the clamping gap (4) is communicated with the cavity (3) and the outside respectively; a negative pressure channel (5) is arranged on the upper die (1) and / or the lower die (2), the air inlet end of the negative pressure channel (5) is communicated with the clamping gap (4), and the air outlet end is used for connecting a negative pressure device.

2. The mold assembly for a heavy-duty truck integrated spoiler of claim 1, wherein The air inlet end is arranged adjacent to the placing cavity (3b).

3. The mold assembly for a heavy-duty truck integrated spoiler of claim 1, wherein: The air inlet end is provided with a negative pressure plate (6), and the negative pressure plate (6) is densely provided with mesh holes communicated with the negative pressure channel (5).

4. The mold assembly for a heavy-duty truck integrated spoiler of claim 1, wherein: The bottom surface of the placing cavity (3b) is arranged below the parting surface of the lower die (2).

5. The mold assembly for a heavy-duty truck integrated spoiler of claim 1, wherein: A mold core (7) is arranged on the lower die (2), the cavity wall of the laying cavity (3a) comprises a top wall and a circumferential side wall of the mold core (7), and the top wall of the mold core (7) is arranged above one side of the placing cavity (3b).

6. The mold assembly for a heavy-duty truck integrated spoiler of claim 1, wherein A pressing block (8) is arranged above the placing cavity (3b) through a telescopic piece (9) arranged on one side adjacent to the upper die (1) and the lower die (2).

7. A molding process of a middle-heavy truck integrated spoiler, characterized in that The method comprises the following steps: S10: preparing an elastic piece with a through hole; S20: placing the elastic piece on the lower die, and keeping the through hole in the axial direction of the through hole and the top surface of the lower die with a laying gap; S30: laying multiple layers of sheets soaked with thermosetting resin on the lower die, so that the sheets cover the orifices at both ends of the through hole; S40: clamping, and molding the sheets, so that the thermosetting resin flows into the through hole and is thermally cured; S50: parting, and taking out the product; The upper die (1) and the lower die (2) are clamped to surround the cavity (3); The cavity (3) comprises a laying cavity (3a) and a placing cavity (3b) communicated with one side of the laying cavity (3a), and laying gaps are arranged between the top surface and the bottom surface of the laying cavity (3a) and the placing cavity (3b); The bottom surface of the placing cavity (3b) is an arc surface protruding towards the upper die (1); A clamping gap (4) is arranged between the upper die (1) and the lower die (2) surrounding the cavity (3), and the clamping gap (4) is communicated with the cavity (3) and the outside respectively; A negative pressure channel (5) is arranged on the upper die (1) and / or the lower die (2), the air inlet end of the negative pressure channel (5) is communicated with the clamping gap (4), and the air outlet end is used for connecting a negative pressure device.

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