Car body apron board forming die and process

Abstract

The car body apron board forming die comprises an upper die body, a lower die body, a fixed apron board middle die body and a movable apron board middle die body, when the fixed apron board die is assembled, the fixed apron board middle die body is placed on the lower die body, then the upper die body is placed on the fixed apron board middle die body, and the movable apron board middle die body is assembled. And finally, the upper die, the fixed apron board middle die and the lower die are fixed. Or the movable skirtboard middle die replaces the fixed skirtboard middle die, when the movable skirtboard die is assembled, the movable skirtboard middle die is firstly placed on the lower die, then the upper die is placed on the movable skirtboard middle die, and finally the upper die, the movable skirtboard middle die and the lower die are fixed. The fixed apron board middle mold and the movable apron board middle mold are connected between the upper mold and the lower mold in a replaceable mode, independent design of the fixed apron board mold and the movable apron board mold is not needed, the mold cost can be effectively reduced, and then the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a vehicle body skirt forming die and process. Background Art

[0002] The vehicle body skirt generally includes a fixed skirt and a movable skirt. One end of the movable skirt is hinged to the vehicle body, and the movable skirt can be opened relative to the vehicle body to achieve maintenance of equipment inside the vehicle body.

[0003] Due to the structural differences between the existing fixed skirt panels and the movable skirt panels, they need to be manufactured using separate molds, resulting in high manufacturing costs.

[0004] Additionally, some current body skirts are manufactured using composite materials, such as multi-axial fabric and epoxy resin, through a pultrusion process. To ensure fiber wettability, injection-type pultrusion molds are currently used. Excessive pressure within the mold cavity during the injection process can lead to a sharp increase in pulling force, resulting in uneven fiber fabric movement and a high risk of mold blockage, leading to the risk of pultrusion failure.

[0005] Therefore, how to reduce the production cost of vehicle body skirts is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] One object of the present invention is to provide a body skirt panel forming die that can realize the forming of fixed skirt panels and movable skirt panels, thereby reducing the mold cost and thus reducing the production cost. Another object of the present invention is to provide a body skirt panel forming process.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A vehicle body skirt panel forming mold comprises: an upper mold, a lower mold, a fixed skirt panel middle mold and a movable skirt panel middle mold, wherein the fixed skirt panel middle mold is detachably connected between the upper mold and the lower mold to form a cavity for forming the fixed skirt panel; or the movable skirt panel middle mold replaces the fixed skirt panel middle mold and is detachably connected between the upper mold and the lower mold to form a cavity for forming the movable skirt panel.

[0009] By connecting the fixed skirt panel middle mold and the movable skirt panel middle mold interchangeably between the upper mold and the lower mold, there is no need to design the fixed skirt panel and movable skirt panel molds independently, which can effectively reduce the mold cost and thus reduce the production cost.

[0010] In some embodiments, a first positioning portion is provided at the bottom of the upper mold, a second positioning portion is provided at the upper part of the lower mold, a third positioning portion that cooperates with the first positioning portion is provided at the upper part of the middle mold of the fixed skirt plate, and a fourth positioning portion that cooperates with the second positioning portion is provided at the lower part of the middle mold of the fixed skirt plate; a fifth positioning portion that cooperates with the first positioning portion is provided at the upper part of the middle mold of the movable skirt plate, and a sixth positioning portion that cooperates with the second positioning portion is provided at the lower part of the middle mold of the movable skirt plate.

[0011] By providing mutually cooperating positioning portions between the upper mold, the middle mold of the fixed skirt plate, and the lower mold, the position accuracy of the middle mold of the fixed skirt plate can be effectively ensured; by providing mutually cooperating positioning portions between the upper mold, the middle mold of the movable skirt plate, and the lower mold, the position accuracy of the middle mold of the movable skirt plate can be effectively ensured.

[0012] In some embodiments, the first positioning portion is a keyway extending along the length direction of the upper mold, the second positioning portion is a key extending along the length direction of the lower mold, the third positioning portion is a key extending along the length direction of the middle mold of the fixed skirt plate, the fourth positioning portion is a keyway extending along the length direction of the middle mold of the fixed skirt plate, the fifth positioning portion is a key extending along the length direction of the middle mold of the movable skirt plate, and the sixth positioning portion is a keyway extending along the length direction of the middle mold of the movable skirt plate.

[0013] Through the cooperation relationship between the key and the keyway, the positioning of each mold can be achieved in the width direction of the mold, thereby ensuring the forming quality of the fixed skirt plate and the movable skirt plate.

[0014] In some embodiments, first connection holes extending in the height direction are provided on the keys and keyways where the middle mold of the fixed skirt plate cooperates with the upper mold and the lower mold, and the upper mold, the middle mold of the fixed skirt plate, and the lower mold are fixed by first fasteners passing through the first connection holes in sequence; second connection holes extending in the height direction are provided on the keys and keyways where the middle mold of the movable skirt plate cooperates with the upper mold and the lower mold, and the upper mold, the middle mold of the movable skirt plate, and the lower mold are fixed by second fasteners passing through the second connection holes in sequence.

[0015] By passing the first fastener through the position where the keys and keyways of the upper mold, the middle mold of the fixed skirt plate, and the lower mold cooperate, or by passing the second fastener through the position where the keys and keyways of the upper mold, the middle mold of the movable skirt plate, and the lower mold cooperate, compared with passing the first fastener outside the keys and keyways, the size of the mold in the width direction can be reduced.

[0016] In some embodiments, a top-opening bolt hole extending in the height direction is provided on the upper mold, and the top-opening bolt hole is used for the mold top-opening bolt to pass through. The upper mold can be easily loosened from the middle mold by the mold top-opening bolt.

[0017] In some embodiments, a resin injection hole communicating with the cavity is provided on the upper mold. A pressure detection hole is also provided on the upper mold, and the pressure detection hole is used to connect a pressure detection sensor, and the pressure detection sensor is used to detect the pressure in the cavity. The pressure situation in the cavity can be accurately known through the pressure detection sensor, so as to facilitate subsequent operations in case of abnormal pressure.

[0018] In some embodiments, a pressure relief hole communicating with the cavity is provided on the lower mold. When the pressure value detected by the pressure detection sensor is greater than a preset value, the pressure relief hole is opened to reduce the pressure in the cavity, so that the forming quality of the fixed skirt and the movable skirt can be improved.

[0019] In some embodiments, a plurality of core molds extending in the length direction are provided in the cavity between the upper mold and the middle mold of the fixed skirt. The plurality of core molds are distributed in the width direction, and the sections of the plurality of core molds located outside the cavity are of variable diameter structures, and the variable diameter directions of adjacent two core molds are staggered with each other to avoid interference problems when arranging fiber fabrics.

[0020] In some embodiments, the middle mold of the fixed skirt includes a first middle mold and a second middle mold distributed in the width direction. The gap between the first middle mold and the second middle mold and the gaps between the first middle mold and the second middle mold and the upper mold form a glue injection runner for the fixed skirt. The middle mold of the fixed skirt is of a split structure to facilitate the manufacture of their respective structures.

[0021] In some embodiments, sling mounting holes are provided on the sides of the upper mold, the lower mold, the middle mold of the fixed skirt and the middle mold of the movable skirt. During lifting operations, lifting lugs can be installed in the sling mounting holes, and then lifted by a lifting device hooked on the lifting lugs. Therefore, the sling mounting holes facilitate the lifting operations of each mold. After the lifting is completed, the lifting lugs can be removed from the sling mounting holes.

[0022] In some embodiments, the vehicle body skirt forming mold further includes a plurality of heating devices distributed in the length direction, and the heating devices are used to heat the vehicle body skirt forming mold. The heating devices are mainly used for the curing operation of the fixed skirt and the movable skirt during the pultrusion process. By providing a plurality of heating devices, multi-stage curing can be achieved, thereby ensuring the pultrusion forming quality.

[0023] In some embodiments, a plurality of thermocouple detection holes are provided on the lower mold and distributed along its length direction, and each thermocouple detection hole is used to connect a thermocouple detection sensor respectively. Through the thermocouple detection sensor, the heating accuracy of the heating device can be improved, thereby ensuring the curing quality.

[0024] A vehicle body skirt forming process, which uses the vehicle body skirt forming die described in any one of the above, to form a vehicle body skirt. The vehicle body skirt forming process includes the following steps:

[0025] Determine the type of vehicle body skirt to be formed, where the types of vehicle body skirts include fixed skirts and movable skirts, and the upper surface structures of the fixed skirts and the movable skirts are the same;

[0026] When the type of vehicle body skirt is a fixed skirt, connect the fixed skirt middle die between the lower die and the upper die to form a cavity for forming the fixed skirt;

[0027] When the type of vehicle body skirt is a movable skirt, connect the movable skirt middle die between the lower die and the upper die to form a cavity for forming the movable skirt.

[0028] In some embodiments, the vehicle body skirt forming process further includes:

[0029] When forming the fixed skirt or the movable skirt, detect the pressure in the cavity;

[0030] Judge whether the pressure in the cavity is greater than a preset value;

[0031] If so, relieve the pressure in the cavity;

[0032] If not, continue to form the fixed skirt or the movable skirt.

[0033] Compared with the prior art, the above technical solution has the following advantages:

[0034] A vehicle body skirt forming die provided by the present invention includes: an upper die, a lower die, a fixed skirt middle die and a movable skirt middle die. When assembling the fixed skirt die, first place the fixed skirt middle die on the lower die, then place the upper die on the fixed skirt middle die, and finally fix the upper die, the fixed skirt middle die and the lower die; or replace the fixed skirt middle die with the movable skirt middle die. When assembling the movable skirt die, first place the movable skirt middle die on the lower die, then place the upper die on the movable skirt middle die, and finally fix the upper die, the movable skirt middle die and the lower die. By replaceably connecting the fixed skirt middle die and the movable skirt middle die between the upper die and the lower die, there is no need to independently design the fixed skirt and the movable skirt dies, which can effectively reduce the die cost and thus reduce the production cost.

[0035] A body skirt forming process provided by the present invention uses the above-mentioned body skirt forming die to form a body skirt. The body skirt forming process includes the following steps: determining the type of the body skirt to be formed; when the type of the body skirt is a fixed skirt, connecting the fixed skirt middle die between the lower die and the upper die; when the type of the body skirt is a movable skirt, connecting the movable skirt middle die between the lower die and the upper die to form a cavity for forming the movable skirt. That is, the fixed skirt middle die and the movable skirt middle die can replace each other and be installed between the upper die and the lower die, so the mold opening cost of the die can be reduced, and further the production costs of the fixed skirt and the movable skirt can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0037] Figure 1 A three-dimensional structural schematic diagram of a body skirt forming die provided by a specific embodiment of the present invention;

[0038] Figure 2 A structural schematic diagram of a body skirt forming die provided by a specific embodiment of the present invention assembled into a fixed skirt die;

[0039] Figure 3 A structural schematic diagram of a body skirt forming die provided by a specific embodiment of the present invention assembled into a movable skirt die;

[0040] Figure 4 A structural schematic diagram of the upper die of a body skirt forming die provided by a specific embodiment of the present invention;

[0041] Figure 5 A structural schematic diagram of the first middle die of a body skirt forming die provided by a specific embodiment of the present invention;

[0042] Figure 6 A structural schematic diagram of the second middle die of a body skirt forming die provided by a specific embodiment of the present invention;

[0043] Figure 7 A structural schematic diagram of the lower die of a body skirt forming die provided by a specific embodiment of the present invention.

[0044] The reference numerals are as follows:

[0045] 10 - Upper die, 11 - First positioning part, 12 - Upper mounting hole, 13 - Ejector bolt hole, 14 - Glue injection runner, 15 - Resin injection hole, 16 - Pressure detection hole, 17 - Upper sling mounting hole, 18 - Upper cooling runner hole, 19 - Mold ejector bolt;

[0046] 20 - Lower die, 21 - Second positioning part, 22 - Lower mounting hole, 23 - Pressure relief hole, 24 - Lower sling mounting hole, 25 - Lower cooling runner hole, 26 - Thermocouple detection hole, 27 - Lifting lug;

[0047] 30 - Fixed skirt middle die, 301 - First middle die, 302 - Second middle die, 303 - Core die, 3031 - Core die injection hole, 3032 - Core die fixing bolt hole, 31 - Third positioning part, 32 - Fourth positioning part, 33 - First connection hole, 34 - Middle die ejector hole, 35 - Middle die glue injection runner hole, 36 - Middle sling mounting hole;

[0048] 40 - Movable skirt middle die;

[0049] 50 - First fastener. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] Please refer to Figures 1 to 7 , Figure 1 , which is a schematic three - dimensional structure diagram of a vehicle body skirt forming mold provided by a specific implementation manner of the present invention; Figure 2 , which is a schematic structure diagram of a vehicle body skirt forming mold assembled into a fixed skirt mold provided by a specific implementation manner of the present invention; Figure 3 , which is a schematic structure diagram of a vehicle body skirt forming mold assembled into a movable skirt mold provided by a specific implementation manner of the present invention; Figure 4 , which is a schematic structure diagram of the upper die of a vehicle body skirt forming mold provided by a specific implementation manner of the present invention; Figure 5 , which is a schematic structure diagram of the first middle die of a vehicle body skirt forming mold provided by a specific implementation manner of the present invention; Figure 6 , which is a schematic structure diagram of the second middle die of a vehicle body skirt forming mold provided by a specific implementation manner of the present invention; Figure 7 , which is a schematic structure diagram of the lower die of a vehicle body skirt forming mold provided by a specific implementation manner of the present invention.

[0052] A vehicle body skirt forming die provided by an embodiment of the present invention includes: an upper die 10, a lower die 20, a fixed skirt middle die 30, and a movable skirt middle die 40. The structures of the upper surfaces of the fixed skirt and the movable skirt are the same, and they can share an upper die 10. Among them, the fixed skirt middle die 30 is detachably connected between the upper die 10 and the lower die 20 to form a cavity for forming the fixed skirt, specifically as Figure 1 shown. When assembling the fixed skirt die, first place the fixed skirt middle die 30 on the lower die 20, then place the upper die 10 on the fixed skirt middle die 30, and finally fix the upper die 10, the fixed skirt middle die 30, and the lower die 20; or the movable skirt middle die 40 replaces the fixed skirt middle die 30 and is detachably connected between the upper die 10 and the lower die 20 to form a cavity for forming the movable skirt, specifically as Figure 2 shown. When assembling the movable skirt die, first place the movable skirt middle die 40 on the lower die 20, then place the upper die 10 on the movable skirt middle die 40, and finally fix the upper die 10, the movable skirt middle die 40, and the lower die 20. By replaceably connecting the fixed skirt middle die 30 and the movable skirt middle die 40 between the upper die 10 and the lower die 20, there is no need to independently design the fixed skirt and the movable skirt dies, which can effectively reduce the die cost and thus reduce the production cost.

[0053] In some embodiments, in order to improve the assembly accuracy of the vehicle body skirt forming die, a first positioning portion 11 is provided at the bottom of the upper die 10, a second positioning portion 21 is provided at the upper part of the lower die 20, and positioning portions that cooperate with the first positioning portion 11 and the second positioning portion 21 are respectively provided at the upper and lower parts of the fixed skirt middle die 30 and the movable skirt middle die 40. Specifically, a third positioning portion 31 that cooperates with the first positioning portion 11 is provided at the upper part of the fixed skirt middle die 30, and a fourth positioning portion 32 that cooperates with the second positioning portion 21 is provided at the lower part of the fixed skirt middle die 30; a fifth positioning portion that cooperates with the first positioning portion 11 is provided at the upper part of the movable skirt middle die 40, and a sixth positioning portion that cooperates with the second positioning portion 21 is provided at the lower part of the movable skirt middle die 40. Among them, the two cooperating positioning portions are preferably a concave-convex positioning structure, such as a positioning structure of a keyway and a key, or a positioning structure of a positioning pin and a positioning hole. Through the positioning portions, the relative positions of the upper die 10, the middle die, and the lower die 20 can be defined, thereby ensuring the structural stability of the vehicle body skirt forming die.

[0054] In some embodiments, as Figure 4 shown, the first positioning portion 11 at the bottom of the upper die 10 is preferably a keyway extending along the length direction of the upper die 10. Specifically, a keyway can be provided on each of the left and right sides at the bottom of the upper die 10. The bottom of the upper die is a structure that is concave upward to form a glue injection runner 14. The depth of the glue injection runner 14 gradually decreases in the pultrusion direction of the die, and the glue injection runner 14 is located between the two keyways; asFigure 7 As shown, the second positioning portion 21 on the upper part of the lower die 20 is a key extending along the length direction of the lower die 20. Specifically, one key is provided on each of the left and right sides of the upper part of the lower die 20, and two keys are provided in the middle of the upper part of the lower die 20, with one key being arranged close to the key on the right side; As Figure 5 and Figure 6 shown, the third positioning portion 31 is a key extending along the length direction of the fixed skirt middle die 30. Specifically, one key is provided on the left side of the upper part of the fixed skirt middle die 30, and another key is provided on the right side, which is used to cooperate with two key grooves on both sides of the bottom of the upper die 10. The fourth positioning portion 32 of the fixed skirt middle die 30 is a key groove extending along the length direction of the fixed skirt middle die 30. The bottom of the fixed skirt middle die 30 is matched with the lower die 20 through keys and key grooves, which can ensure the position of the fixed skirt middle die 30 in the width direction. The bottom die of the upper die 10 is matched with the fixed skirt through keys and key grooves, which can ensure the position of the upper die 10 in the width direction; As Figure 3 shown, the fifth positioning portion of the movable skirt is a key extending along the length direction of the movable skirt middle die 40, and the sixth positioning portion is a key groove extending along the length direction of the movable skirt middle die 40. The movable skirt is matched with the lower die 20 through keys and key grooves, which can ensure the position of the movable skirt in the width direction. The upper die 10 is matched with the movable skirt through keys and key grooves, which can ensure the position of the upper die 10 in the width direction. During installation, the middle die can be lifted first, and then after the keys and key grooves on the middle die and the lower die 20 correspond to each other, the middle die is placed on the lower die 20. Similarly, when installing the upper die 10, it is also necessary to make the keys and key grooves on the upper die 10 and the middle die correspond to each other. In addition, the positioning structure between the upper die 10, the middle die and the lower die 20 can also adopt a structure in which a dovetail groove and a dovetail protrusion are matched. During installation, it can be pushed and installed from the side, and this structure can play a positioning role in the vertical direction for the upper die 10 and the middle die.

[0055] In some embodiments, the upper die 10, the fixed skirt middle die 30 and the lower die 20 can be fixedly connected by passing through the first fastener 50. The upper die 10, the movable skirt middle die 40 and the lower die 20 can be fixedly connected by passing through the second fastener. Further, the first fastener 50 can pass through the keys and keyways of the fixed skirt middle die 30 cooperating with the upper die 10 and the lower die 20. The second fastener can pass through the keys and keyways of the movable skirt middle die 40 cooperating with the upper die 10 and the lower die 20. A first connection hole 33 extending in the height direction is provided on the keys and keyways of the fixed skirt middle die 30 cooperating with the upper die 10 and the lower die 20. The upper die 10, the fixed skirt middle die 30 and the lower die 20 are fixed by the first fastener 50 passing through the first connection hole 33 in sequence. Correspondingly, the upper die 10 is provided with an upper mounting hole 12 coaxial with the first connection hole 33, the lower die 20 is provided with a lower mounting hole 22 coaxial with the first connection hole 33, and the fixed skirt middle die 30 is provided with a first middle mounting hole coaxial with the first connection hole 33. A second connection hole extending in the height direction is provided on the keys and keyways of the movable skirt middle die 40 cooperating with the upper die 10 and the lower die 20. The upper die 10, the movable skirt middle die 40 and the lower die 20 are fixed by the second fastener passing through the second connection hole in sequence. A second middle mounting hole coaxial with the second connection hole is provided on the movable skirt middle die 40. To improve the installation stability of the fixed skirt middle die 30 and the movable skirt middle die 40, a plurality of mounting holes distributed in the length direction can be respectively provided on the upper die 10, the middle die and the lower die 20. The mounting holes are preferably equally spaced.

[0056] In some embodiments, for the convenience of mold opening, a jacking bolt hole 13 penetrating in the height direction is provided on the upper die 10. The jacking bolt hole 13 preferably penetrates the keyway at the bottom of the upper die 10. Two pairs of jacking bolt holes 13 can be respectively provided at positions close to both ends of the upper die 10. Each pair of jacking bolt holes 13 are respectively located on both sides of the upper die 10. The jacking bolt hole 13 is used for the mold jacking bolt 19 to pass through. When it is necessary to jack up the upper die 10, the jacking bolt is screwed towards the middle die. After the lower end of the jacking bolt contacts the upper surface of the middle die, as the jacking bolt is continuously screwed downwards, the upper die 10 will become loose relative to the middle die. By first loosening the upper die 10 and then lifting the upper die 10, the problem that the upper die 10 and the lower die 20 are adhesively lifted synchronously can be avoided. Further, the middle die can also be opened by a jacking method. For example, a middle die jacking hole 34 is also provided on the middle die. A middle die jacking bolt is threadedly connected in the middle die jacking hole 34. The upper end of the middle die jacking bolt needs to be located inside the middle die jacking hole 34. When it is necessary to jack up the middle die, by screwing the middle die jacking bolt, the middle die can become loose relative to the lower die 20. By first loosening the middle die and then lifting the middle die, the problem that the middle die and the lower die 20 are adhesively lifted synchronously can be avoided.

[0057] In some embodiments, a resin injection hole 15 communicating with the cavity is provided on the upper mold 10. The number of resin injection holes 15 can be multiple. For example, Figure 1 As shown, three resin injection holes 15 are provided on the upper mold 10 and are distributed along the width direction. A pressure detection hole 16 is also provided on the upper mold 10. The pressure detection hole 16 is preferably arranged close to the resin injection hole 15. The pressure detection hole 16 is used to connect a pressure detection sensor, and the pressure detection sensor is used to detect the pressure in the cavity. When pultrusion is carried out through the vehicle body skirt forming die, the pressure in the cavity can be detected in real time by the pressure detection sensor, so as to clearly know the pressure condition in the cavity.

[0058] In some embodiments, a pressure relief hole 23 communicating with the cavity is provided on the lower mold 20. As Figure 7 shown, a plurality of pressure relief holes 23 are provided on the lower mold 20, and the plurality of pressure relief holes 23 are distributed along the width direction of the lower mold 20. The pressure relief hole 23 is preferably a counterbore, and a sealing ring is provided in the counterbore to ensure the sealing performance in the cavity during the pultrusion process. When the pressure detection sensor detects that the pressure in the cavity is greater than a preset value, the cavity can be depressurized through the pressure relief hole 23 to avoid the problem of excessive cavity pressure. Therefore, the pultrusion quality of the fixed skirt and the movable skirt can be improved. Specifically, a controller can be set up. The controller is connected to the pressure detection sensor, and a preset value is set in the controller. The pressure detection sensor will send the detected pressure value to the controller, and the controller will compare the detected pressure value with the preset value. When the detected pressure value is greater than the preset value, the pressure relief hole is opened to reduce the pressure in the cavity; when the detected pressure value is not greater than the preset value, the forming of the fixed skirt or the movable skirt continues. However, in the prior art, during pultrusion, if the pressure is too high, the pulling force will increase. Currently, the problem of excessive cavity pressure is mainly solved by reducing the glue injection amount and lowering the pultrusion speed. However, the above methods are likely to cause quality defects in the products of the fixed skirt and the movable skirt, such as the problem of discontinuous glue injection.

[0059] In some embodiments, as Figure 1 shown, a plurality of core molds 303 extending along the length direction are provided in the cavity between the upper mold 10 and the middle mold 30 of the fixed skirt. For example, three core molds 303 are provided. During forming, three cavities will be formed in the middle of the fixed skirt. The plurality of core molds 303 are distributed along the width direction, and the sections of the plurality of core molds 303 outside the cavity are of variable diameter structures, and the variable diameter directions of adjacent two core molds 303 are staggered from each other. For example, Figure 2 as shown, the core mold 303 on the left side has a downward variable diameter, the core mold 303 in the middle has an upward variable diameter, and the core mold 303 on the right side has a downward variable diameter. Among them, as Figure 1As shown, the outer diameter of the core mold 303 gradually decreases from right to left. The various core molds 303 have stepped diameter-changing structures that are staggered from each other, facilitating the arrangement of the fiber fabric at the front end to avoid interference. In addition, as Figure 1 shown, at one end of the core mold 303 away from the fixed skirt middle mold 30, there are core mold fixing bolt holes 3032 to prevent the core mold 303 from being unstable due to excessive cantilever length. Additionally, to improve the quality of glue injection, core mold injection holes 3031 are provided on the core mold 303. Therefore, during molding, in combination with the resin injection holes 15 provided on the upper mold 10 and the middle mold glue injection runner holes 35 provided on the middle mold, internal and external glue injection can be achieved, thereby improving the molding quality of the fixed skirt.

[0060] In some embodiments, as Figure 2 , Figure 5 and Figure 6 shown, the fixed skirt middle mold 30 includes a first middle mold 301 and a second middle mold 302 distributed along the width direction, that is, the fixed skirt middle mold 30 has a split structure. The gap between the first middle mold 301 and the second middle mold 302 and the gaps between the first middle mold 301 and the second middle mold 302 and the upper mold 10 form the fixed skirt glue injection runner 14. The width of the first middle mold 301 is greater than that of the second middle mold 302. The gap between the first middle mold 301 and the upper mold is mainly used for molding the main structure of the fixed skirt, and the gap between the first middle mold 301 and the second middle mold 302 is mainly used for molding the bent structure of the fixed skirt. During assembly, the first middle mold 301 and the second middle mold 302 are respectively hoisted onto the lower mold 20. There are three keyways at the bottom of the first middle mold 301 and one keyway at the bottom of the second middle mold 302. The first middle mold 301 is engaged with three keys on the upper part of the lower mold 20 through the three keyways, and the second middle mold 302 is engaged with one key on the far right of the upper part of the lower mold 20 through one keyway. The first middle mold 301 is provided with middle mold glue injection runner holes 35, and the side of the second middle mold 302 is also provided with middle mold glue injection runner 14 holes to ensure the molding quality of the fixed skirt. In addition, middle mold top opening holes 34 are respectively provided on the first middle mold 301 and the second middle mold 302. A middle mold top opening bolt is threadedly connected inside the middle mold top opening hole 34 on the first middle mold 301, and another middle mold top opening bolt is threadedly connected inside the middle mold top opening hole 34 on the second middle mold 302, that is, both the first middle mold 301 and the second middle mold 302 can be jacked open from the lower mold 20. Further, multiple middle mold top opening holes 34 are distributed along the length direction on the first middle mold 301, and multiple middle mold top opening holes 34 are also distributed along the length direction on the second middle mold 302.

[0061] In some embodiments, lifting tool installation holes are provided on the sides of the upper mold 10, the lower mold 20, the fixed skirt middle mold 30, and the movable skirt middle mold 40. The lifting tool installation holes are used to install the lifting lugs 27. Among them, as Figure 4As shown in the figure, two hanging tool mounting holes 17 are respectively provided on the left and right sides and the front and rear ends of the upper die 10 to facilitate the stability during the hoisting of the upper die; as Figure 5 shown, two middle hanging tool mounting holes 36 are respectively provided at the front and rear ends of the first middle die 301 to facilitate the stability during the hoisting of the first middle die 301, as Figure 6 shown, one middle hanging tool mounting hole 36 is respectively provided at the front and rear ends of the second middle die 302 to facilitate the stability during the hoisting of the second middle die 302. In addition, two hanging tool mounting holes are respectively provided on the left and right sides and the front and rear ends of the movable skirt middle die 40 to facilitate the stability during the hoisting of the movable skirt middle die 40; as Figure 7 shown, two lower hanging tool mounting holes 24 are respectively provided on the left and right sides and the front and rear ends of the lower die 20 to facilitate the stability during the hoisting of the lower die 20. In addition, an upper cooling channel hole 18 is provided on the side of the upper die 10, and coolant can be injected into the cooling channel in the upper die 10 through the upper cooling channel hole 18. A lower cooling channel hole 25 is provided on the side of the lower die 20, and coolant can be injected into the cooling channel in the lower die 20 through the lower cooling channel hole 25.

[0062] In some embodiments, the vehicle body skirt forming die further includes a plurality of heating devices distributed along the length direction, and the heating devices are arranged on the front section of the vehicle body skirt forming die in the pultrusion direction, wherein the heating devices are used to heat the vehicle body skirt forming die. For example, it includes three heating devices arranged in sequence. The heating devices surround the outer peripheral side of the die and are sequentially denoted as the first-stage heating device, the second-stage heating device, and the third-stage heating device along the pultrusion direction, and the curing temperatures are 120 - 150 °C, 150 - 180 °C, 150 - 180 °C respectively, that is, the fixed skirt and the movable skirt adopt three-stage curing to ensure the pultrusion forming quality.

[0063] In some embodiments, a plurality of thermocouple detection holes 26 are provided on the lower die 20 along its length direction, as Figure 7 shown, three thermocouple detection holes 26 are provided on the lower die 20. The thermocouple detection holes 26 are preferably blind holes, and the depth of the blind holes is preferably half of the thickness of the lower die 20. Each thermocouple detection hole 26 is used to connect a thermocouple detection sensor respectively, and one thermocouple detection sensor corresponds to one heating device. By detecting the temperature of each area of the die, it can ensure that the temperature during pultrusion conforms to the curing of the resin, thereby ensuring the pultrusion forming quality of the fixed skirt and the movable skirt.

[0064] The embodiment of the present invention also provides a vehicle body skirt forming process, which uses the vehicle body skirt forming die provided in any one of the above embodiments to form a vehicle body skirt. The vehicle body skirt forming process includes the following steps:

[0065] Determine the type of vehicle body skirt to be formed, where the types of vehicle body skirts include fixed skirts and movable skirts. The upper surface structures of the fixed skirts and the movable skirts are the same, and a common upper mold 10 can be used.

[0066] When the type of vehicle body skirt is a fixed skirt, connect the middle mold 30 of the fixed skirt between the lower mold 20 and the upper mold 10 to form a cavity for forming the fixed skirt. Specifically, during assembly, first fix the position of the lower mold 20, then place the middle mold 30 of the fixed skirt on the lower mold 20, and finally place the upper mold 10 on the upper part of the middle mold 30 of the fixed skirt. After placing it in place, use the first fastener 50 to penetrate and fix the upper mold 10, the middle mold 30 of the fixed skirt, and the lower mold 20, and then the forming of the fixed skirt can be carried out.

[0067] When the type of vehicle body skirt is a movable skirt, connect the middle mold 40 of the movable skirt between the lower mold 20 and the upper mold 10 to form a cavity for forming the movable skirt. Specifically, during assembly, first fix the position of the lower mold 20, then place the middle mold 40 of the movable skirt on the lower mold 20, and finally place the upper mold 10 on the upper part of the middle mold 40 of the movable skirt. After placing it in place, use the second fastener to penetrate and fix the upper mold 10, the middle mold 40 of the movable skirt, and the lower mold 20, and then the forming of the movable skirt can be carried out. Since the middle mold 30 of the fixed skirt and the middle mold 40 of the movable skirt can share the same upper mold 10 and lower mold 20, that is, the middle mold 30 of the fixed skirt and the middle mold 40 of the movable skirt can replace each other and be installed between the upper mold 10 and the lower mold 20, the mold opening cost can be reduced, and thus the production costs of the fixed skirt and the movable skirt can be reduced.

[0068] In some embodiments, the vehicle body skirt forming process further includes: when forming the fixed skirt or the movable skirt, detecting the pressure in the cavity. Specifically, a pressure detection hole 16 can be provided on the upper mold 10, the pressure detection hole 16 is communicated with the cavity, and a pressure detection sensor is installed in the pressure detection hole 16. The pressure detection sensor can detect the pressure in the cavity in real time; determine whether the pressure in the cavity is greater than a preset value. Specifically, it can be determined by a controller. For example, a preset value is set in the controller, and the pressure detection sensor is connected to the controller; if the pressure in the cavity is greater than the preset value, relieve the pressure in the cavity to avoid excessive pressure in the cavity and affecting the pultrusion forming quality; if the pressure in the cavity is not greater than the preset value, continue to form the fixed skirt or the movable skirt.

[0069] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0071] In addition, in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0072] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0073] The above has introduced in detail a vehicle body skirt forming die and process provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A vehicle body skirt forming die, characterized in that, Including: An upper mold, a lower mold, a fixed skirt middle mold and a movable skirt middle mold. The fixed skirt middle mold is detachably connected between the upper mold and the lower mold to form a cavity for molding the fixed skirt; or the movable skirt middle mold replaces the fixed skirt middle mold and is detachably connected between the upper mold and the lower mold to form a cavity for molding the movable skirt.

2. The vehicle body skirt forming die according to claim 1, characterized in that, A first positioning portion is provided at the bottom of the upper mold, a second positioning portion is provided at the upper part of the lower mold, a third positioning portion that cooperates with the first positioning portion is provided at the upper part of the fixed skirt middle mold, and a fourth positioning portion that cooperates with the second positioning portion is provided at the lower part of the fixed skirt middle mold; a fifth positioning portion that cooperates with the first positioning portion is provided at the upper part of the movable skirt middle mold, and a sixth positioning portion that cooperates with the second positioning portion is provided at the lower part of the movable skirt middle mold.

3. The vehicle body skirt forming die according to claim 2, characterized in that, The first positioning portion is a keyway extending along the length direction of the upper mold, the second positioning portion is a key extending along the length direction of the lower mold, the third positioning portion is a key extending along the length direction of the fixed skirt middle mold, the fourth positioning portion is a keyway extending along the length direction of the fixed skirt middle mold, the fifth positioning portion is a key extending along the length direction of the movable skirt middle mold, and the sixth positioning portion is a keyway extending along the length direction of the movable skirt middle mold.

4. The vehicle body skirt forming die according to claim 3, characterized in that, First connection holes extending in the height direction are provided on the keys and keyways where the fixed skirt middle mold cooperates with the upper mold and the lower mold. The upper mold, the fixed skirt middle mold and the lower mold are fixed by first fasteners passing through the first connection holes in sequence; second connection holes extending in the height direction are provided on the keys and keyways where the movable skirt middle mold cooperates with the upper mold and the lower mold. The upper mold, the movable skirt middle mold and the lower mold are fixed by second fasteners passing through the second connection holes in sequence.

5. The vehicle body skirt forming die according to claim 1, wherein, A jacking bolt hole extending in the height direction is provided on the upper mold, and the jacking bolt hole is used for the mold jacking bolt to pass through.

6. The vehicle body skirt forming die according to claim 1, characterized in that, A resin injection hole communicating with the cavity is provided on the upper mold, and a pressure detection hole is also provided on the upper mold. The pressure detection hole is used to connect a pressure detection sensor, and the pressure detection sensor is used to detect the pressure in the cavity.

7. The vehicle body skirt forming die according to claim 6, characterized in that, A pressure relief hole communicating with the cavity is provided on the lower mold.

8. The vehicle body skirt forming die according to claim 1, wherein, A plurality of core molds extending in the length direction are provided in the cavity between the upper mold and the fixed skirt middle mold. The plurality of core molds are distributed in the width direction, and the sections of the plurality of core molds located outside the cavity are of variable diameter structures, and the variable diameter directions of adjacent two core molds are staggered from each other.

9. The vehicle body skirt forming die according to claim 1, characterized in that, The fixed skirt middle mold includes a first middle mold and a second middle mold distributed in the width direction. The gap between the first middle mold and the second middle mold and the gaps between the first middle mold and the second middle mold and the upper mold form a fixed skirt glue injection runner.

10. The vehicle body skirt forming die according to claim 1, characterized in that, Lifting tool mounting holes are provided on the sides of the upper mold, the lower mold, the fixed skirt middle mold and the movable skirt middle mold.

11. The vehicle body skirt forming die according to claim 1, characterized in that, The vehicle body skirt forming mold further includes a plurality of heating devices distributed in the length direction, and the heating devices are used to heat the vehicle body skirt forming mold.

12. The vehicle body skirt forming die according to claim 11, wherein, A plurality of thermocouple detection holes are provided on the lower die and are distributed along its length direction, and each of the thermocouple detection holes is used to connect a thermocouple detection sensor respectively.

13. A forming process for a vehicle body skirt panel, which uses the vehicle body skirt panel forming die according to any one of claims 1 to 12 to form a vehicle body skirt panel, and is characterized in that, The vehicle body skirt forming process includes the following steps: Determine the type of vehicle body skirt to be formed; When the vehicle body skirt type is a fixed skirt, connect the fixed skirt middle die between the lower die and the upper die to form a cavity for forming the fixed skirt; When the vehicle body skirt type is a movable skirt, connect the movable skirt middle die between the lower die and the upper die to form a cavity for forming the movable skirt.

14. The vehicle body skirt forming process according to claim 13, characterized in that, It further includes: When forming the fixed skirt or the movable skirt, detect the pressure in the cavity; Judge whether the pressure in the cavity is greater than a preset value; If so, relieve the pressure in the cavity; If not, continue to form the fixed skirt or the movable skirt.

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