Automobile bumper lightweight mold forming device and process

Abstract

The present application discloses a lightweight mold forming device for automobile bumpers and its process, which relates to the field of automobile parts production and manufacturing. The molding device includes an injection molding machine frame, a mold and an injection molding mechanism arranged on the injection molding machine frame, and an electrical control module. The mold includes a fixed mold and two left and right movable molds adapted to the fixed mold. The left and right movable molds are close to each other and form a cavity for molding the injection molded product. The surface of the movable mold is evenly provided with multiple groups of water outlet holes connected to the cavity. The injection molding machine frame is equipped with a water supply mechanism and an air supply mechanism that can operate alternately and are used to pass water into the water outlet holes, respectively. The injection molded product is ejected from the movable mold by the water pressure at the water outlet holes. The present application uses a water pressure ejection / air pressure ejection method to replace the ejection method in the prior art. Water and gas are softer than traditional rigid ejection, effectively reducing the risk of damage to the automobile bumper product and the mold itself during demolding.

Description

Technical Field

[0001] The present application relates to the field of automobile parts manufacturing, and in particular to a lightweight mold forming device for an automobile bumper and a process thereof. Background Art

[0002] The bumper system is a critical component of a car's body. When a serious collision occurs, the impact force is dispersed throughout the vehicle body, preventing excessive deformation in certain areas and protecting passengers. The structural design of a car's bumper not only impacts the safety of the driver and passengers, but also its durability.

[0003] Injection molding is a common molding method for automobile bumpers. However, since automobile bumpers have a large injection molding surface and a large number of undercut injection molding structures, in the prior art, an ejector pin structure is often used to eject the automobile bumper from the mold. For example, a Chinese invention patent application with application publication number CN105773935A discloses an ejection device for an automobile bumper mold, which includes a first inclined ejection mechanism for undercut demoulding of the automobile bumper edge, a second inclined ejection mechanism for demoulding the oblique side wall of the automobile bumper lampshade panel, and a lower mold assembly for accommodating the first inclined ejection mechanism and the second inclined ejection mechanism; the lower end of the first inclined ejection mechanism is fixed to the top plate of the mold ejection mechanism, and the upper end has a profile of the undercut edge of the automobile bumper; the lower end of the second inclined ejection mechanism is a free end and is slidably connected to the lower mold assembly, and the upper end is connected to the first inclined ejection mechanism through a linkage mechanism, and the upper end has a profile of the oblique side wall of the automobile bumper lampshade panel. The first and second inclined ejector mechanisms in the ejection device are both composed of an inclined ejector and an ejector rod (equivalent to the ejector pin structure in existing devices). After injection molding is completed, the ejection device uses the ejector rod to push the ejector toward the outside of the mold and eject the injection-molded automobile bumper product using the inclined ejector.

[0004] Regarding the aforementioned related technologies, in actual production, due to the multiple curved surfaces and grooves in the design of the automobile bumper product itself, when using the aforementioned inclined ejector and ejector pin structure / ejector pin structure to eject the automobile bumper product from the mold after injection molding, not only a large number of inclined ejector and ejector pin structures are required to eject the automobile bumper product, but the inclined ejector and ejector pin structure / ejector pin structure also needs to have a strong actual ejection force to ensure the complete ejection of the automobile bumper. In addition, high requirements are placed on the surface smoothness of the mold cavity. When the mold cavity surface is rough, such as when the mold cavity and runner have surface defects such as gouges, nicks, scars, and dents, it will make the automobile bumper difficult to demold. In other words, the traditional demolding structure has high requirements for mold processing and actually poses a greater risk of damage to the automobile bumper product. During demolding, the automobile bumper product is prone to sticking to the inclined ejector block / ejector pin structure / mold cavity, or the ejector pin structure / ejector pin mechanism exerts excessive ejection force, thereby damaging the product. Summary of the Invention

[0005] In order to improve the problem that the demolding structure in the traditional method is prone to causing the automobile bumper product to stick to the inclined ejector block / ejector structure / mold cavity or ejector rod structure / ejector mechanism during demolding and thus damaging the product due to excessive ejection force, the present application provides a lightweight mold forming device and process for an automobile bumper.

[0006] This application provides a lightweight mold forming device for automobile bumpers, which adopts the following technical solutions:

[0007] A lightweight mold forming device for an automobile bumper comprises an injection molding machine frame, a mold and an injection molding mechanism arranged on the injection molding machine frame, and an electrical control module for integrated control of various electrical components on the injection molding machine frame, wherein the mold comprises a fixed mold and two left and right movable molds adapted to the fixed mold, and a cavity for molding a finished injection molded product is formed on the side close to the left and right movable molds; a plurality of groups of water outlet holes connected to the cavity are evenly formed on the surface of the movable mold; a water supply mechanism for passing water into the water outlet holes and an air supply mechanism for ventilating into the water outlet holes are installed on the injection molding machine frame, and the water supply mechanism and the air supply mechanism operate alternately, and the finished injection molded product is pushed away from the movable mold by the water pressure at the water outlet holes; a water tank for receiving waste water is also provided on the injection molding machine frame and below the movable mold, and a sealing mechanism is installed on the movable mold for covering and sealing the water outlet holes when the injection molding mechanism injects molds into the cavity.

[0008] By adopting the above technical solution, in the actual production process of the automobile bumper, the water outlet hole on the movable mold is covered and sealed by a blocking mechanism, the left and right movable molds are clamped together, and the liquid raw material is injected into the cavity between the two movable molds by an injection molding mechanism, and the finished automobile bumper is formed after cooling; then, the operator can control the fixed mold to drive the two movable molds to move away from each other, and in the process of the two movable molds moving away from each other, use the water supply mechanism and the air supply mechanism to successively introduce water and air into the mold, use the water pressure at the water outlet hole to push the finished automobile bumper in the cavity away from the movable mold, and use the air pressure to flush out the waste water remaining in the movable mold when the automobile bumper is separated from the movable mold, and at the same time use the air pressure to further flush the finished automobile bumper away from the movable mold, so that the finished automobile bumper is detached from the mold and the automobile bumper is removed from the mold from one side of the finished automobile bumper, and a water tank is used to collect the waste water in the process.

[0009] The molding device as a whole utilizes water pressure and air pressure to replace the ejector pin structure / ejector mechanism used in existing / traditional technologies to eject the finished automobile bumper from the movable mold. When the water pressure ejects the finished automobile bumper, the water is softer than rigid components such as the inclined ejector in the ejector pin structure / ejector pin structure. The water can flow and fill the space between the finished automobile bumper and the inner wall of the movable mold at the cavity, lubricating and cushioning the inner wall of the movable mold at the cavity, thereby protecting and reducing surface damage within the mold cavity and runners. At the same time, the operator can adjust the actual ejection force of the water supply mechanism on the automobile bumper product by controlling the water pressure to ensure complete ejection of the automobile bumper. This overall system effectively improves the problem of traditional demolding structures, which can easily cause the automobile bumper product to stick to the inclined ejector block / ejector pin structure / mold cavity or the ejector pin structure / ejector pin mechanism during demolding, thereby damaging the product due to excessive ejection force. This reduces the risk of damage to the automobile bumper product and the mold itself during demolding.

[0010] Optionally, each group of the water outlet holes includes a plurality of single holes distributed in a circular array, and the sealing mechanisms are provided in a one-to-one correspondence with each group of water outlet holes; each group of the sealing mechanisms includes a plurality of sealing leaves that movably cover the plurality of single holes in any group of water outlet holes, a first driving component for driving the plurality of sealing leaves to synchronously approach / move away from the single hole, and a lifting component for ejecting the sealing leaves toward the outside of the movable mold when the sealing leaves completely cover the corresponding single holes, and the outer surfaces of the sealing leaves are arranged in a stepped manner and are suitable to be flush with the surface of the movable mold.

[0011] By adopting the above technical solution, during injection molding, the first driving component is used to drive multiple sealing leaves to synchronously approach and cover the single hole, and the lifting component is used to push the sealing leaves toward the outside of the movable mold so that the outer surface of the sealing leaves is flush with the surface of the movable mold, thereby ensuring that the cavity and the runner surface between the movable molds are flush and without depressions, thereby ensuring the injection molding effect of the automobile bumper; accordingly, when the injection molding is completed and the automobile bumper needs to be ejected, the operator can use the first driving component to take the sealing leaves away from the single hole, and correspondingly cancel the lifting of the sealing leaves by the lifting component, thereby opening the single hole and ensuring smooth water / air outlet from the single hole, thereby realizing the ejection of the automobile bumper product.

[0012] Optionally, the first drive assembly includes a first drive gear ring rotatably connected to the movable mold and a first drive component for driving the first drive tooth to rotate circumferentially around its axis, the blocking leaf is slidably connected to the outside of the first drive gear ring, and an elastic member for fixing and pulling the two together is provided between the blocking leaf and the first drive gear ring, the opening direction of the single hole, the sliding direction of the blocking leaf and the telescopic direction of the elastic member are all parallel to the axial direction of the first drive gear ring; when the first drive gear ring rotates to its rotation end point, the blocking leaf completely covers the corresponding single hole.

[0013] By adopting the above technical solution, a driving assembly is used to drive the first driving gear ring to rotate, which can more conveniently drive multiple sealing leaves to perform circumferential motion more stably and synchronously, thereby more conveniently realizing the adjustment and control of the opening and closing of a single hole, and keeping the sealing leaves stable after the first driving gear ring drives the sealing leaves to rotate to the appropriate position.

[0014] Optionally, the lifting assembly includes a plurality of lifting blocks correspondingly arranged in a plurality of single holes, a plurality of rotating rods correspondingly arranged in the middle of the plurality of lifting blocks and rotatably connected to the movable mold, and a second driving component for driving the plurality of rotating rods to rotate synchronously; the axial direction of the rotating rod is consistent with the opening direction of the corresponding single hole, and a gap is left between the end of the rotating rod and the sealing leaf for the sealing leaf to slide in; the lifting block is coaxially sleeved and threadedly assembled on the corresponding rotating rod, and the lifting block is slidably connected to the movable mold along the axial direction of the rotating rod, and the lifting block is movably abutted against the sealing leaf.

[0015] By adopting the above technical solution, the second driving component is used to drive the rotating rod to rotate, which can drive the top block to move linearly along the axial direction of the rotating rod; and after the top block moves to the appropriate position, the rotating rod is stopped and the top block no longer moves, so that the sealing leaf can be stably and forcefully pressed against the opening of the single hole when the sealing leaf completely covers the single hole, thereby achieving effective sealing coverage of the single hole by the sealing leaf.

[0016] Optionally, an accommodating arc groove connected to the corresponding single hole is further provided on the inner wall of the movable mold outside the multiple single holes in each group of the water outlet holes, and the opening of the accommodating arc groove is parallel to the radial direction of the first driving gear ring, and the accommodating arc groove extends from the bottom of the single hole toward the single hole opening toward the outside of the movable mold along the circumferential direction of the first driving gear ring, and the sealing leaf is slidably connected in the accommodating arc groove along the extension direction of the accommodating arc groove, and the opening size of the accommodating arc groove continuously decreases from the bottom of the single hole toward the single hole opening.

[0017] By adopting the above-mentioned technical solution, the setting of the accommodating arc groove can effectively limit the movement trajectory of the sealing leaf, so that the sealing leaf can stably approach / move away from the corresponding single hole under the driving action of the first driving gear ring and the tensioning action of the elastic member, thereby achieving stability, sealing coverage and opening and closing control of the corresponding single hole.

[0018] Optionally, the top block is in a truncated cone shape, and the cross-sectional area of ​​the top block continuously expands from the inside of the movable mold toward the outside of the movable mold along the axial direction of the rotating rod.

[0019] By adopting the above technical solution, the distance between the ejector block and the single-hole opening is adjusted along the axial direction of the rotating rod, so that the water pressure can be fine-tuned while the size of the single hole remains unchanged, thereby achieving fine-tuning of the ejection force of the automobile bumper product by the water supply mechanism, further reducing the risk of damage to the automobile bumper product during demolding.

[0020] Optionally, one end of the top block away from the blocking leaf is movably plugged into the inlet end of the corresponding single hole, and the top block is gap-matched with the inner wall of the movable mold at the corresponding single hole.

[0021] By adopting the above technical solution, during the injection molding process, the operator can also control the rotation of the rotating rod and insert the top block into the inlet end of the single hole to seal the inlet end of the single hole, thereby avoiding water leakage / air leakage at the single hole and ensuring the injection molding effect of the molding device on the car bumper.

[0022] Optionally, the water trough is opened upward, and a water cooling mechanism for cooling wastewater and a filtering mechanism for filtering wastewater during the wastewater cooling process are further provided on the outside of the injection molding machine frame. The movable mold is provided with a cooling mechanism for cooling and molding the liquid raw material injected into the mold cavity; the water cooling mechanism includes a water tank with an upward opening, a water pump provided in the water tank, and a dry ice introduction component for introducing dry ice into the water tank. The water trough is connected to the water tank, and the water outlet end of the water pump is connected to the water inlet end of the cooling mechanism.

[0023] By adopting the above technical solution, during and after the demolding process of the automobile bumper, the water tank can always keep receiving the wastewater flowing out of the single hole on the movable mold, and the filtering mechanism can effectively filter the wastewater during this process; accordingly, the relatively clean water obtained by filtration can be quickly cooled by dry ice in the water tank and reused to the cooling mechanism on the movable mold, thereby realizing the recycling and reuse of the wastewater; and by controlling the amount and speed of dry ice introduced and the length of the transportation channel for the cold water to be reused to the cooling mechanism, the temperature of the cooling water reused to the cooling mechanism can be regulated and controlled, thereby realizing the gradual cooling and cooling molding of the automobile bumper, and avoiding deformation of the automobile bumper due to sudden cooling.

[0024] Optionally, the filtering mechanism includes a filter screen detachably mounted at the water outlet of the sink and a filter element for absorbing organic waste in the wastewater. The filter screen covers the filter element and the wastewater passes through the filter screen and the filter element in sequence.

[0025] By adopting the above technical solution, the filter screen and filter element can effectively intercept and filter solid impurities and organic waste in the wastewater, thereby effectively realizing the reuse of the wastewater.

[0026] The present application also provides a lightweight mold forming process for an automobile bumper, comprising the following steps:

[0027] S1: Injection molding, the raw material is melted into liquid by high temperature and injected into the mold through the injection molding mechanism;

[0028] S2: Cooling to form a finished car bumper;

[0029] S3: Demolding: Use the water supply mechanism and air supply mechanism to sequentially introduce water and air into the mold at high speed and high pressure. Use the water pressure to separate the finished car bumper from the mold. Then use the air pressure to blow out the water remaining on the movable mold, and use the water tank to collect the waste water.

[0030] S4: Remove the finished car bumper, close the mold again, and repeat the above steps.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The molding device utilizes water and air pressure to eject the finished bumper from the movable mold, replacing the ejector pin / ejector mechanism used in existing / traditional technologies. Water is gentler on rigid components such as the inclined ejector pin in the ejector pin / ejector pin structure, and can also lubricate and cushion the inner wall of the movable mold cavity. This effectively mitigates the problem of the bumper product sticking to the inclined ejector pin / ejector pin structure / mold cavity or the ejector pin / ejector pin structure during demolding, which can be caused by excessive ejection force. This reduces the risk of damage to the bumper product and the mold itself during demolding.

[0033] 2. The coordination of the single hole, the blocking leaf, the first drive assembly, and the lifting assembly allows for convenient and stable control of the water / air outlet, the volume of water / air outlet, and the water / air pressure of the water supply mechanism, thereby ensuring effective separation of the water supply mechanism and the air supply mechanism from the movable mold of the automobile bumper product.

[0034] 3. Through the cooperation of the water tank, water cooling mechanism and filtering mechanism, the recycling of waste water and the regulation and control of the temperature of the cooling water recycled to the cooling mechanism can be realized, thereby realizing the gradual cooling and cooling molding of the automobile bumper, and avoiding the deformation of the automobile bumper due to sudden cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0036] Figure 2 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present application;

[0037] Figure 3 This is a partial cross-sectional structural diagram of the movable mold, which is used to show the connection relationship between the various components in the movable mold;

[0038] Figure 4 This is a partial cross-sectional structural diagram of the injection molding machine frame and the water tank, which is used to demonstrate the filtering mechanism in the water tank.

[0039] 1. Injection molding machine frame; 2. Mold; 21. Fixed mold; 22. Moving mold; 221. Water outlet hole; 2211. Single hole; 222. Arc accommodating groove; 3. Injection molding mechanism; 4. Water supply mechanism; 5. Air supply mechanism; 6. Water trough; 7. Sealing mechanism; 71. Sealing leaf; 72. First drive assembly; 721. First drive gear ring; 722. First drive component; 7221. First drive motor; 7222. First drive gear; 73. Lifting assembly; 731. Lifting block; 732. Rotating rod; 733. Second drive component; 7331. Second drive gear ring; 7332. Second drive motor; 7333. Second drive gear; 74. Elastic member; 8. Water cooling mechanism; 81. Water tank; 82. Dry ice inlet assembly; 9. Filter mechanism; 91. Filter screen; 92. Mounting cylinder; 93. Filter element. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-4 This application is described in further detail.

[0041] The embodiment of the present application discloses a lightweight mold forming device for an automobile bumper.

[0042] Reference Figure 1 and Figure 2The lightweight mold forming device for an automobile bumper includes an injection molding machine frame 1, a mold 2 and an injection molding mechanism 3 arranged on the injection molding machine frame 1, and an electrical control module for integrated control of various electrical components on the injection molding machine frame 1; the mold 2 includes two left and right fixed molds 21 fixedly mounted on the injection molding machine frame 1 and two left and right movable molds 22 slidably mounted between the two fixed molds 21 and adapted to the fixed molds 21, the injection molding mechanism 3 is located outside the left fixed mold 21 / the right fixed mold 21, and when the left and right movable molds 22 are combined, a cavity for molding an injection-molded product (i.e., the automobile bumper in this application) is formed on the side where the left and right movable molds 22 are close to each other, and a cooling mechanism for cooling and molding the liquid raw material injected into the cavity is also installed on the left and right movable molds 22.

[0043] In order to improve the problem of automobile bumper products sticking to the inclined ejector block / ejector structure / mold cavity 2 or ejector rod structure / ejector mechanism during demoulding, which may be caused by excessive ejection force and damage to the product, refer to Figure 1 , and combined with Figure 2 and Figure 3 A plurality of water outlet holes 221 connected to the cavity are evenly provided on the surface of the movable mold 22. A water supply mechanism 4 for passing water into the water outlet holes 221 and an air supply mechanism 5 for ventilating into the water outlet holes 221 are installed on the injection molding machine frame 1. The water supply mechanism 4 and the air supply mechanism 5 operate alternately, and the injection molded product is pushed away from the movable mold 22 by the water pressure at the water outlet holes 221; a water tank 6 for receiving waste water is also provided on the injection molding machine frame 1 and below the movable mold 22. A sealing mechanism 7 for covering and sealing the water outlet holes 221 when the injection molding mechanism 3 injects into the cavity is installed on the movable mold 22.

[0044] Specifically, refer to Figure 2 and Figure 3 The water outlet holes 221 are opened on a relatively flat surface of the movable mold 22. Each group of water outlet holes 221 includes multiple single holes 2211 with circular openings. The specifications of the multiple single holes 2211 in each group of water outlet holes 221 are consistent. The size and depth of the single holes 2211 between different groups of water outlet holes 221 vary according to the area of ​​the flat surface of the movable mold 22 / car bumper. The outlets of the multiple single holes 2211 are connected to the cavity, and the inlet is located in the movable mold 22, and the two A delivery branch channel for supplying water / gas into the single hole 2211 is provided at the inlet of each single hole 2211 on the side away from the movable mold 22. Each delivery branch channel is connected to the corresponding single hole 2211. Multiple delivery branch channels converge into a delivery main channel, and the delivery branch channels and the delivery main channel are evenly meandering in the movable mold 22. The side of the delivery main channel away from the single hole 2211 is connected to the air outlet end of the water supply mechanism 4 and the air outlet end of the air supply mechanism 5 through a three-way interface and a corresponding solenoid valve.

[0045] The multiple single holes 2211 in each group of water outlet holes 221 are distributed in a ring array to expand the contact area between the water flow / gas at the water outlet holes 221 and the injection molded product, making the water / gas outlet at the water outlet holes 221 more uniform.

[0046] Reference Figure 2 and Figure 3 , a plurality of sealing mechanisms 7 are provided corresponding to each group of water outlet holes 221, and each group of sealing mechanisms 7 includes a plurality of sealing leaves 71 that are movably covered on a plurality of single holes 2211 in any group of water outlet holes 221, a first driving component 72 for driving the plurality of sealing leaves 71 to synchronously approach / move away from the single hole 2211, and a lifting component 73 for ejecting the sealing leaves 71 toward the outside of the movable mold 22 when the sealing leaves 71 completely cover the corresponding single hole 2211.

[0047] The area of ​​the sealing leaf 71 is larger than that of the single hole 2211. The multiple sealing leaves 71 are also arranged in a circular array, and the central axis of the ring formed by the multiple sealing leaves 71 is collinear with the central axis of the ring formed by the multiple single holes 2211. The sealing leaf 71 approaches or moves away from the corresponding single hole 2211 along the circumferential direction corresponding to the ring formed by the multiple single holes 2211 to achieve opening and closing control of the corresponding single hole 2211. The side surface of the sealing leaf 71 close to the cavity of the movable mold 22 is the outer surface of the sealing leaf 71. The outer surface of the sealing leaf 71 is arranged in a stepped manner, and the thickness of the sealing leaf 71 in the middle is thicker than the thickness at the edge of the sealing leaf 71.

[0048] The inner wall of the movable mold 22 at each group of water outlet holes 221 is also provided with multiple groups of accommodating grooves and accommodating arc grooves 222 connected to the corresponding single hole 2211. The accommodating grooves are used to accommodate the blocking leaf 71 in the movable mold 22 when the single hole 2211 is opened, and the accommodating grooves are located on one side of the single hole 2211 along the movement direction of the blocking leaf 71, and the accommodating grooves are irregular grooves; the accommodating arc grooves 222 are used to allow the blocking leaf 71 to move in the single hole 2211 and limit the movement of the blocking leaf 71 in the process of the blocking leaf 71 gradually opening / covering and closing the single hole 2211.

[0049] Specifically, refer to Figure 2 and Figure 3The first driving assembly 72 includes a first driving gear ring 721 rotatably connected to the movable mold 22 and a first driving component 722 for driving the first driving gear ring 721 to rotate circumferentially around its axis. The axis of the first driving gear ring 721 passes through the center point of the ring surrounded by the multiple single holes 2211, and the serrations of the first driving gear ring 721 face inward. The blocking leaf 71 is installed on the outside of the first driving gear ring 721, and a device for fixing and pulling the blocking leaf 71 and the first driving gear ring 721 is provided between the blocking leaf 71 and the first driving gear ring 721. The elastic parts 74 of the two; the blocking leaf 71 rotates along the extension direction of the accommodating arc groove 222 with the first driving gear ring 721 and is slidably connected to the outside of the first driving gear ring 721 at the same time, and the opening direction of the single hole 2211, the sliding direction of the blocking leaf 71 on the first driving gear ring 721 and the expansion and contraction direction of the elastic part 74 are all parallel to the axial direction of the first driving gear ring 721; when the first driving gear ring 721 rotates to its rotation end point, the blocking leaf 71 completely covers the corresponding single hole 2211.

[0050] The first driving component 722 specifically includes a first driving motor 7221 and a first driving gear 7222 arranged on the inner side of the first driving gear ring 721. The first driving motor 7221 is fixedly mounted on the movable mold 22, and the first driving gear 7222 is fixedly mounted on the output shaft end of the first driving motor 7221, and the first driving gear 7222 is meshed with the inner side of the first driving gear ring 721; starting the first driving motor 7221 and controlling the operation of the first driving motor 7221 can more conveniently and stably drive the first driving gear 7222 to drive the sealing leaf 71 to rotate circumferentially around the center point of the circular ring surrounded by multiple single holes 2211, and the transmission ratio between the first driving gear 7222 and the first driving gear ring 721 is relatively small, so the operator can control the operation of the first driving motor 7221 more conveniently and accurately.

[0051] Accordingly, refer to Figure 2 and Figure 3 , the opening of the accommodating arc groove 222 is parallel to the radial direction of the driving gear ring, and the accommodating arc groove 222 extends from the bottom of the single hole 2211 toward the opening of the single hole 2211 toward the outside of the movable mold 22 along the circumferential direction of the driving gear ring. The blocking leaf 71 can simultaneously slide from the bottom of the single hole 2211 toward the opening of the single hole 2211 toward the outside of the movable mold 22 along the extension direction of the accommodating arc groove 222 during the rotation of the first driving gear ring 721, and the opening size of the accommodating arc groove 222 continuously decreases from the bottom of the single hole 2211 toward the opening of the single hole 2211; the elastic member 74 is preferably a spring in the embodiment of the present application, and the elastic member 74 also rotates with the first driving gear ring 721 during the rotation of the first driving gear ring 721, and the elastic member 74 is continuously stretched and extended during the sliding of the blocking leaf 71 toward the outside of the movable mold 22.

[0052] The lifting assembly 73 includes a plurality of lifting blocks 731 correspondingly arranged in the plurality of single holes 2211, a plurality of rotating rods 732 correspondingly arranged in the middle of the plurality of lifting blocks 731 and rotatably connected to the movable mold 22, and a second driving component 733 for driving the plurality of rotating rods 732 to rotate synchronously.

[0053] The axial direction of the rotating rod 732 is consistent with the opening direction of the corresponding single hole 2211, and a gap is left between the end of the rotating rod 732 and the blocking leaf 71 for the blocking leaf 71 to slide in. The rotating rod 732 located in the single hole 2211 is provided with a threaded section for the top block 731 to connect.

[0054] When the locking cam 731 is in the state of being lifted up, the locking cam 731 is in the state of being lifted up and locked in the state of being lifted up, so that the pinion 731 can be locked in the state of being effectively blocked.

[0055] Reference Figure 2 and Figure 3 In the process of the blocking leaf 71 moving from its rotation starting point to its rotation end point along with the first driving component 722, the second driving component 733 is used to drive the rotating rod 732 to rotate, which can correspondingly drive the top block 731 to move linearly along the axial direction of the rotating rod 732; and the second driving component 733 specifically includes a second driving gear ring 7331, a second driving motor 7332 and a second driving gear 7333, the second driving gear ring 7331 has serrations facing outward, and the second driving gear 7333 is provided with a plurality of corresponding rotating rods 732, and the plurality of second driving gears 7333 are provided. The driving gear 7333 is coaxially fixedly connected one by one to the end of the multiple rotating rods 732 away from the blocking leaf 71, and the multiple second driving gears 7333 are distributed in a ring array on the outside of the second driving gear ring 7331 and are all engaged with the second driving gear ring 7331; starting the second driving motor 7332 can drive the multiple rotating rods 732 to rotate synchronously, and drive the multiple top blocks 731 to approach / move away from the blocking leaf 71 synchronously, so that the multiple top blocks 731 correspondingly press the blocking leaf 71 / seal the inlet end of the single hole 2211.

[0056] The second driving component 733 is used to drive the rotating rod 732 to rotate, which can drive the top block 731 to move linearly along the axial direction of the rotating rod 732; and after the top block 731 moves to the appropriate position, the rotating rod 732 is stopped, and the top block 731 no longer moves, so that the sealing leaf 71 can be stably and forcefully pressed against the opening of the single hole 2211 when the sealing leaf 71 completely covers the single hole 2211, thereby achieving effective sealing coverage of the single hole 2211 by the sealing leaf 71.

[0057] When the locking cam 731 is in the closed position, the locking cam 731 will be in the closed position, and the locking cam 731 will be in the open position, so that the locking cam 731 can be locked.

[0058] Further, refer to Figure 1 and Figure 4 A water cooling mechanism 8 for cooling waste water and a filtering mechanism 9 for filtering waste water during the waste water cooling process are also provided on the outside of the injection molding machine frame 1 .

[0059] The water tank 6 opens upward and has an outlet at its bottom, and the vertical projection of the movable mold 22 is located in the water tank 6. During and after the demolding of the automobile bumper, the water tank 6 can always keep receiving the waste water flowing out of the single hole 2211 on the movable mold 22.

[0060] The water cooling mechanism 8 includes a water tank 81 with an upward opening, a water pump arranged in the water tank 81, and a dry ice introduction component 82 for introducing dry ice into the water tank 81. The outlet of the water tank 6 is connected to the water tank 81, and the water outlet end of the water pump is connected to the water inlet end of the cooling mechanism.

[0061] The filter mechanism 9 is provided at the outlet of the water tank 6 , and specifically comprises a filter screen 91 detachably mounted at the outlet of the water tank 6 and a filter element 93 for absorbing organic waste in the wastewater.

[0062] Specifically, refer to Figure 4The bottom opening of the water tank 6 is threadedly assembled with a mounting cylinder 92, the opening of the mounting cylinder 92 faces upward, and the bottom and side walls of the mounting cylinder 92 are penetrated by fine water filtering holes. The filter element 93 can be removably placed in the mounting cylinder 92, and the filter element 93 is gap-fitted with the inner side wall of the mounting cylinder 92. The filter screen 91 covers the filter element 93 and the wastewater passes through the filter screen 91 and the filter element 93 in turn.

[0063] During the demolding process of the automobile bumper and after the demolding is completed, the filtering mechanism 9 can always effectively filter the wastewater generated during the demolding process. The filtered, relatively clean water can be quickly cooled by dry ice in the water tank 81 and reused to the cooling mechanism on the movable mold 22, thereby realizing the recycling of wastewater; and by controlling the amount and speed of dry ice introduced and the length of the transportation channel for the cold water to be reused to the cooling mechanism, the temperature of the cooling water reused to the cooling mechanism can be regulated and controlled, thereby realizing the gradual cooling and cooling molding of the automobile bumper, and avoiding deformation of the automobile bumper due to sudden cooling.

[0064] The implementation principle of the lightweight mold forming device for automobile bumpers in the embodiment of the present application is as follows: in the actual production process of the automobile bumper, the blocking leaf 71 is rotated to its rotation end point, and the second driving motor 7332 in the blocking mechanism 7 is used to drive the rotating rod 732 to drive the top block 731 to press the corresponding blocking leaf 71, so that the blocking leaf 71 correspondingly covers and seals the multiple groups of water outlet holes 221 on the movable mold 22, the left and right movable molds 22 are clamped and the liquid raw material is injected into the cavity between the two movable molds 22 by the injection molding mechanism 3, and the automobile bumper product is formed after cooling; then, the operator can control the fixed mold 21 to drive the two movable molds 22 to move away from each other, and use the water supply mechanism 4 and the air supply mechanism 5 to successively introduce water and gas into the mold 2 during the process of the two movable molds 22 moving away from each other. Air, first use the water supply mechanism 4 to pass water into the main conveying channel at high speed and high pressure, so that water is discharged at high speed and high pressure at the water outlet through hole 221, and the water pressure at the single hole 2211 then pushes the finished car bumper in the cavity away from the movable mold 22; after the car bumper is separated from the movable mold 22, the operator can stop the water flow of the water supply mechanism 4 and switch to the air supply mechanism 5 to pass gas into the main conveying channel at high speed and high pressure, and use the air pressure to flush out the waste water remaining in the movable mold 22, and at the same time use the air pressure to further flush the finished car bumper away from the movable mold 22, so that the finished car bumper is separated from the mold 2 and at the same time, the car bumper is removed from the mold 2 from the side of the finished car bumper, and in this process, the waste water is received by the water tank 6, and the waste water is always reused. The molding device as a whole utilizes water pressure and air pressure to replace the ejector structure / ejector mechanism used in existing / traditional technologies to eject the finished automobile bumper from the movable mold 22. When the water pressure ejects the finished automobile bumper, the water is softer than rigid components such as the inclined ejector in the ejector structure / ejector mechanism. The water can flow and fill the space between the finished automobile bumper and the inner wall of the movable mold 22 at the cavity, lubricating and cushioning the inner wall of the movable mold 22 at the cavity, effectively protecting and reducing surface damage within the mold cavity and runner of mold 2. At the same time, the operator can adjust the actual ejection force of the water supply mechanism 4 on the automobile bumper product by controlling the water pressure to ensure complete ejection of the automobile bumper. This overall system effectively improves the problem of the traditional demolding structure, which can easily cause the automobile bumper product to stick to the inclined ejector block 731 / ejector structure / mold 2 cavity or the ejector structure / ejector mechanism during demolding, thereby damaging the product due to excessive ejection force. This reduces the risk of damage to the automobile bumper product and the mold 2 itself during demolding.

[0065] The embodiment of the present application further discloses a lightweight mold forming process for an automobile bumper, based on the above-mentioned lightweight mold forming device for an automobile bumper, which specifically includes the following steps:

[0066] S1: Injection molding, the raw material is melted into liquid by high temperature and injected into the mold 2 through the injection molding mechanism 3;

[0067] S2: Cooling: using the cooling mechanism to gradually introduce water with a temperature of less than 5-10°C into the movable mold 22, so that the movable mold 22 and the product in the cavity of the movable mold 22 are gradually cooled to form a finished automobile bumper;

[0068] S3: Demolding. Water and air are introduced into the mold 2 at high speed and high pressure using the water supply mechanism 4 and the air supply mechanism 5. The finished car bumper is first separated from the mold 2 using water pressure. The air pressure is then used to blow out the water remaining on the movable mold 22 and further blow away the finished bumper. The waste water is collected by the water tank 6. During the collection process, the waste water is continuously filtered and reused.

[0069] S4: Remove the finished car bumper, close the mold again, and repeat the above steps.

[0070] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A lightweight mold forming device for an automobile bumper, comprising an injection molding frame (1), a mold (2) and an injection molding mechanism (3) arranged on the injection molding frame (1), and an electrical control module for integrated control of electrical components on the injection molding frame (1), characterized in that: The mold (2) comprises a fixed mold (21) and two left and right movable molds (22) adapted to the fixed mold (21); a cavity for molding a finished injection product is formed on a side adjacent to the left and right movable molds (22); The surface of the movable mold (22) is evenly provided with a plurality of water outlet holes (221) connected to the mold cavity. The injection molding machine frame (1) is provided with a water supply mechanism (4) for passing water into the water outlet holes (221) and an air supply mechanism (5) for passing air into the water outlet holes (221). The water supply mechanism (4) and the air supply mechanism (5) operate alternately, and the injection molded product is pushed away from the movable mold (22) by the water pressure at the water outlet holes (221). A water tank (6) for receiving waste water is further provided on the injection molding machine frame (1) and below the movable mold (22). A sealing mechanism (7) is installed on the movable mold (22) for covering and sealing the water outlet hole (221) when the injection molding mechanism (3) is injecting into the mold cavity. Each group of the water outlet through holes (221) comprises a plurality of single holes (2211) distributed in a ring array, and the blocking mechanism (7) is provided with a plurality of groups corresponding to each group of the water outlet through holes (221); Each group of the blocking mechanisms (7) comprises a plurality of blocking leaves (71) that are movably covered one by one on a plurality of single holes (2211) in any group of water outlet through holes (221), a first driving assembly (72) for driving the plurality of blocking leaves (71) to synchronously approach / move away from the single holes (2211), and a lifting assembly (73) for pushing the blocking leaves (71) toward the outside of the movable mold (22) when the blocking leaves (71) completely cover the corresponding single holes (2211). The outer surfaces of the blocking leaves (71) are arranged in a stepped manner and are adapted to be flush with the surface of the movable mold (22).

2. The lightweight mold forming device for automobile bumper according to claim 1, characterized in that: The first driving assembly (72) includes a first driving gear ring (721) rotatably connected to the movable mold (22) and a first driving component (722) for driving the first driving gear ring (721) to rotate circumferentially around its axis. The blocking leaf (71) is slidably connected to the outside of the first driving gear ring (721), and an elastic member (74) is provided between the blocking leaf (71) and the first driving gear ring (721) for fixing and pulling the two together. The opening direction of the single hole (2211), the sliding direction of the blocking leaf (71) and the telescopic direction of the elastic member (74) are all parallel to the axial direction of the first driving gear ring (721). When the first driving gear ring (721) rotates to its rotation end point, the blocking leaf (71) completely covers the corresponding single hole (2211).

3. The lightweight mold forming device for automobile bumper according to claim 2, characterized in that: The lifting assembly (73) comprises a plurality of lifting blocks (731) which are arranged in a one-to-one correspondence in a plurality of single holes (2211), a plurality of rotating rods (732) which are arranged in a one-to-one correspondence in the middle of the plurality of lifting blocks (731) and are rotatably connected to the movable mold (22), and a second driving component (733) for driving the plurality of rotating rods (732) to rotate synchronously; the axial direction of the rotating rods (732) is consistent with the opening direction of the corresponding single hole (2211), and a gap is left between the end of the rotating rod (732) and the blocking leaf (71) for the blocking leaf (71) to slide in; the lifting block (731) is coaxially sleeved and threadedly assembled on the corresponding rotating rod (732), and the lifting block (731) is slidably connected to the movable mold (22) along the axial direction of the rotating rod (732), and the lifting block (731) is in movably contact with the blocking leaf (71).

4. The lightweight mold forming device for automobile bumper according to claim 3, characterized in that: An accommodating arc groove (222) communicating with the corresponding single hole (2211) is further provided on the inner wall of the movable mold (22) outside the plurality of single holes (2211) in each group of the water outlet through holes (221). The opening of the accommodating arc groove (222) is parallel to the radial direction of the first driving gear ring (721). The accommodating arc groove (222) extends from the bottom of the single hole (2211) toward the opening of the single hole (2211) toward the outside of the movable mold (22) along the circumferential direction of the first driving gear ring (721). The blocking leaf (71) is slidably connected to the accommodating arc groove (222) along the extending direction of the accommodating arc groove (222). The opening size of the accommodating arc groove (222) decreases continuously from the bottom of the single hole (2211) toward the opening of the single hole (2211).

5. The lightweight mold forming device for automobile bumper according to claim 3, characterized in that: The top block (731) is in a truncated cone shape, and the cross-sectional area of ​​the top block (731) continuously expands from the inside of the movable mold (22) toward the outside of the movable mold (22) along the axial direction of the rotating rod (732).

6. The lightweight mold forming device for automobile bumper according to claim 5, characterized in that: One end of the top block (731) away from the blocking leaf (71) is movably plugged into the inlet end of the corresponding single hole (2211), and the top block (731) is clearance-matched with the inner wall of the movable mold (22) at the corresponding single hole (2211).

7. The lightweight mold forming device for automobile bumpers according to any one of claims 1 to 6, characterized in that: The water tank (6) is opened upward, and a water cooling mechanism (8) for cooling wastewater and a filtering mechanism (9) for filtering wastewater during the wastewater cooling process are further provided on the outside of the injection molding machine frame (1). The movable mold (22) is provided with a cooling mechanism for cooling and molding the liquid raw material injected into the mold cavity; The water cooling mechanism (8) comprises a water tank (81) with an upward opening, a water pump disposed in the water tank (81), and a dry ice introduction component (82) for introducing dry ice into the water tank (81); the water tank (6) is connected to the water tank (81); and the water outlet of the water pump is connected to the water inlet of the cooling mechanism.

8. The lightweight mold forming device for automobile bumper according to claim 7, characterized in that: The filtering mechanism (9) comprises a filter screen (91) detachably mounted at the water outlet of the water tank (6) and a filter element (93) for absorbing organic waste in the wastewater. The filter screen (91) covers the filter element (93), and the wastewater passes through the filter screen (91) and the filter element (93) in sequence.

9. A lightweight mold forming process for an automobile bumper, based on the lightweight mold forming device for an automobile bumper according to any one of claims 1 to 8, characterized in that: The steps include: S1: Injection molding, the raw material is melted into liquid by high temperature and injected into the mold (2) through the injection molding mechanism (3); S2: Cooling to form a finished car bumper; S3: demoulding, using the water supply mechanism (4) and the air supply mechanism (5) to sequentially introduce water and air into the mold (2) at high speed and high pressure, using the water pressure to separate the finished automobile bumper from the mold (2), and then using the air pressure to blow out the water remaining on the movable mold (22), and using the water tank (6) to collect the waste water; S4: Remove the finished car bumper, close the mold again, and repeat the above steps.

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