A brake pump housing die-casting equipment and die-casting method

Abstract

This invention belongs to the field of die-casting technology for brake pump housings, specifically a die-casting molding equipment and method for brake pump housings. It includes a frame and an injection cylinder located above the frame, with a cylinder head movably connected inside. The injection cylinder has a front chamber and a rear chamber located on either side of the cylinder head. It also includes a front adjustment unit located above the injection cylinder and connected to the front chamber, comprising a front accumulator for adjusting the hydraulic oil volume in the front chamber; and a rear adjustment unit located on one side of the injection cylinder and connected to the rear chamber, comprising a rear accumulator. This invention is simple to operate, safe and stable, highly adaptable, and has high control precision. It ensures the quality of die-casting through air path switching, meeting the high-precision die-casting requirements of brake pump housings. Furthermore, it utilizes a buffer to further ensure stable switching, and the temperatures of the compressed gas and hydraulic oil are controllable, correspondingly ensuring precise and stable application of thrust to the molten metal.

Description

Technical Field

[0001] This invention belongs to the field of housing die casting technology, specifically a brake pump housing die casting equipment and die casting method. Background Technology

[0002] The brake pump is a core safety component of the vehicle braking system, and it is made of aluminum alloy. Its performance directly affects the vehicle's braking reliability and driving safety. As the main structural component of the pump body, the brake pump housing needs to withstand the high pressure conditions during braking and ensure the precise fit between the internal piston and the oil and gas passages. This places extremely high demands on the density, mechanical properties, and dimensional accuracy of the casting. Therefore, under current industrial conditions, the only molding process that can simultaneously meet the comprehensive requirements of "high density, complex thin wall, high precision, large batch, and low cost" for the brake pump housing is high-pressure die casting. Aluminum alloy is more convenient for die casting to form the required brake pump housing.

[0003] Chinese invention patent application with publication number CN121244884A belongs to the technical field of shell die casting and relates to an aluminum alloy shell die casting forming device, which includes a bracket, a hydraulic cylinder, a base plate, a guide rod, an elastic element, a lower mold, an upper mold and a support plate.

[0004] CN118699322A discloses a die-casting equipment and die-casting method for aluminum alloy housing die-casting parts, including a die-casting mechanism. The die-casting mechanism includes a base frame, and a feeding mechanism is installed inside the base frame. The feeding mechanism includes a limiting frame and a mounting frame.

[0005] The above solutions all have many technical problems. For example, the brake pump housing has complex hydraulic oil passages and precision cylinder bores. The wall thickness of the brake pump housing is uneven and there is a deep hole in the center. Therefore, when switching from high-speed filling to pressurized compaction, the switching of the oil circuit will cause the hydraulic oil supply to stop or even flow back and fluctuate. This will cause the molten metal to become disordered inside the mold and affect the normal die casting effect. When using compressed gas to switch the air circuit, although the compressed gas has strong compressibility, it will still inevitably cause piston fluctuation. Moreover, when the degree of compression of the compressed gas is different, the heat generated by the gas itself is different, which will cause the expansion of the hydraulic oil and the compressed gas to be different. Ultimately, this will cause the thrust on the molten metal to change and affect the die casting accuracy.

[0006] To address the aforementioned issues, this application proposes a brake pump housing die-casting equipment and a die-casting method. Summary of the Invention

[0007] To address the above problems, this invention provides a brake pump housing die-casting equipment and a die-casting method.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a brake pump housing die-casting molding equipment, comprising a frame and an injection cylinder located above the frame, wherein a cylinder head is movably connected inside the injection cylinder, and a front chamber and a rear chamber are respectively configured inside the injection cylinder and located on both sides of the cylinder head, and further comprising: The front adjustment unit, located above the injection cylinder and connected to the interior of the front chamber, includes a front accumulator for adjusting the amount of hydraulic oil inside the front chamber. The rear adjustment section is located on one side of the injection cylinder and is connected to the interior of the rear cavity. It includes a rear accumulator, and a high-speed gas tank and a high-pressure gas tank are connected above the rear accumulator through connecting pipes. The active section, which is movably connected inside the rear accumulator, includes a lower piston. An upper piston is movably connected above the lower piston via a buffer. The upper piston moves downward to squeeze the buffer and drive the lower piston downward. When the air circuit is switched, the high-speed air tank stops supplying air and the high-pressure air tank starts supplying air. The buffer is elastically released and elastically pushes the lower piston.

[0009] This application is simple to operate, safe and stable, highly adaptable, and has high control precision. It ensures the quality of die casting by switching the air circuit, which is suitable for the high-precision die casting requirements of brake pump housing. At the same time, it can further ensure the stability of switching with the help of buffer components. The temperature of compressed gas and hydraulic oil is controllable, which ensures the precise and stable application of thrust to molten metal.

[0010] Preferably, the front-end adjustment section further includes: The front-end oil storage tank is fixedly connected to the top of the frame, and the output end of the front-end oil storage tank is connected to the upper input end of the front-end accumulator through the pump body; The front-end accumulator is fixedly connected above the injection cylinder, and the output end of the front-end accumulator is connected to the front chamber through an oil pipe. The hydraulic oil inside the front chamber is connected to the lower part of the front-end accumulator through an oil pipe.

[0011] Preferably, the rear adjustment section further includes: The manifold has one end connected to the lower output end of the rear accumulator, and the other end passes through the injection cylinder and is connected to the interior of the rear cavity. The lower part of the connecting pipe is connected to the upper part of the back-end accumulator, and the upper part is connected to the high-speed gas tank and the high-pressure gas tank respectively through a three-way valve. The compressed gas stored inside the high-speed gas tank and the high-pressure gas tank are both connected to the upper part of the back-end accumulator through the connecting pipe.

[0012] Preferably, the active part further includes: The sealing rings are fixedly connected to the outer surfaces of the lower and upper pistons, and the other end is slidably connected to the inner wall of the rear accumulator. The upper part of the buffer is connected to the lower part of the upper piston, and the lower part of the buffer is connected to the upper part of the lower piston. The buffer is elastic and stores elastic energy.

[0013] Preferably, the active part further includes: The lubrication groove is formed on the outer surface of the lower piston for the flow of lubricating fluid. Multiple docking holes are evenly formed inside the lower piston, and multiple return holes are evenly formed inside the upper piston. The docking holes and return holes are staggered and connected. The inlet pipe is fixedly connected above the upper piston, and its upper part passes through the upper part of the rear accumulator and is connected to the output end of the lubricating fluid tank through the pump body, while its lower part is connected to the upper part of the return hole. The outlet pipe is fixedly connected above the upper piston. The upper part of the outlet pipe passes through the upper part of the rear accumulator and is connected to the input end of the lubricating fluid tank through the pump body. The lower part is connected to the return hole.

[0014] Preferably, the active part further includes: The friction ring is fixedly connected to the inner wall of the rear accumulator and corresponds to the sealing ring on the outer surface of the upper piston. The friction force of the friction ring gradually increases from top to bottom. The top cavity is located above the lower piston, and the upper piston is slidably connected to the top cavity.

[0015] Preferably, a distance sensor is provided below the upper piston to detect the distance between the lower part of the upper piston and the lower part of the top cavity, and a hydraulic sensor is provided inside the rear cavity to detect the hydraulic pressure inside the rear cavity.

[0016] Preferably, a stationary mold is fixedly connected to the top of the frame, and a central cavity is opened inside the stationary mold. A connecting rod is provided on the side of the cylinder head away from the rear adjustment part. The other end of the connecting rod passes through the injection cylinder and is slidably connected to the inner wall of the central cavity through the punch. A moving mold is movably connected to the side of the stationary mold away from the injection cylinder, and an ejection mechanism is movably connected to the other side of the moving mold.

[0017] A method for die-casting a brake pump housing, wherein the method utilizes a brake pump housing die-casting equipment to die-cast the brake pump housing, and includes the following steps: S1. When die casting begins, the high-speed gas tank starts supplying gas and through the connecting pipe, the high-speed compressed gas is sent into the accumulator at the rear end. The upper piston squeezes the buffer and drives the lower piston to move downward. The lower piston pushes the hydraulic oil into the rear chamber and drives the cylinder head to move. S2. When the molten metal is switched from high-speed filling to pressurization, the high-speed gas tank stops supplying gas and the high-pressure gas tank starts supplying gas. The high-pressure compressed gas inside the high-pressure gas tank enters the accumulator at the rear end along the connecting pipe and applies high-pressure thrust to the upper piston. S3. After die casting is completed, both the high-speed gas tank and the high-pressure gas tank stop supplying gas. The front-end accumulator introduces hydraulic oil into the front cavity and drives the cylinder head to move in the opposite direction to reset.

[0018] Preferably, S2 further includes: S201. During the air circuit switching process, the compressed gas applies a thrust to the upper piston and, in conjunction with the elastic release of the buffer, applies a thrust to the lower piston. The lower piston maintains a thrust on the hydraulic oil. S202, the high-pressure compressed gas increases the thrust applied to the upper piston and decreases the distance between it and the lower piston, the overlapping area of ​​the docking hole and the return hole increases, and the amount of lubricating fluid flowing inside the inlet pipe, lubrication tank and outlet pipe increases.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this application, by setting up components such as high-speed air tank and high-pressure air tank in cooperation, hydraulic oil is replaced with compressed gas to push the upper and lower pistons. By taking advantage of the compressibility of compressed gas, the stability during air circuit switching is improved, and the actual precision requirements for the die casting of the brake pump housing are met.

[0020] 2. In this application, by setting up components such as distance sensors and hydraulic sensors to cooperate with each other, the hydraulic value inside the rear cavity and the distance between the upper and lower pistons are detected in real time, so as to accurately judge the changes in the hydraulic oil inside the rear cavity and make timely and accurate adjustments to avoid causing major safety losses.

[0021] 3. In this application, by setting up components such as sealing rings and friction rings to cooperate with each other, the sealing rings realize the sealed sliding connection between the upper piston and the lower piston and the inner wall of the rear accumulator. At the same time, when the air circuit is switched, the friction rings limit the upper piston, so that the buffer elastically releases its effect above the lower piston and maintains the thrust of the lower piston on the hydraulic oil.

[0022] 4. In this application, by setting up components such as lubrication groove, return hole and docking hole to cooperate with each other, when the distance between the upper piston and the lower piston decreases, the overlapping area of ​​the return hole and docking hole increases and the flow of lubricating fluid increases accordingly, thereby further improving the lubrication and cooling effect and ensuring the stability of compressed gas and hydraulic oil operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the entire invention from another perspective; Figure 3 This is a three-dimensional structural diagram of the front adjustment part of the present invention; Figure 4 This is a three-dimensional structural diagram of the front adjustment section of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a three-dimensional structural diagram of the rear adjustment section of the present invention; Figure 7 This is a three-dimensional structural diagram of the rear adjustment section of the present invention; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 This is a three-dimensional structural diagram of the movable part of the present invention; Figure 10 This is a three-dimensional structural diagram of the brake pump of the present invention.

[0024] In the diagram: 1. Frame; 2. Injection cylinder; 3. Front cavity; 4. Rear cavity; 5. Cylinder head; 6. Connecting rod; 7. Front adjustment section; 701. Front accumulator; 702. Front oil tank; 703. Oil pipe; 8. Rear adjustment section; 801. Rear accumulator; 802. Connecting pipe; 803. High-speed air tank; 804. High-pressure air tank; 805. Manifold; 9. Moving part; 901. Lower piston; 902. Upper piston; 903. Sealing ring; 904. Lubrication groove; 905. Docking hole; 906. Liquid inlet pipe; 907. Buffer; 908. Friction ring; 909. Distance sensor; 910. Top cavity; 911. Limiting component; 912. Liquid outlet pipe; 913. Return hole; 10. Ejection mechanism; 11. Hydraulic sensor; 12. Moving mold; 13. Stationary mold; 14. Center cavity. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1 When die-casting the brake pump housing, due to its complex hydraulic oil channels and precision cylinder bores, as well as the uneven wall thickness and deep hole in the center, when switching from high-speed filling to pressurization, a single hydraulic circuit cannot simultaneously meet the speed requirements of high-speed filling and the hydraulic requirements of pressurization. If two separate hydraulic circuits are used for high-speed filling and pressurization respectively, the supply of hydraulic oil will inevitably experience momentary interruptions or backflow during the switching process, causing turbulence in the molten metal inside the mold and affecting the final die-casting effect. Furthermore, if the amount of hydraulic oil inside the injection cylinder 2 changes, it is impossible to accurately determine the cause of the problem, requiring a shutdown for inspection, further reducing the requirements for efficient die-casting.

[0027] like Figures 1 to 10 As shown, a brake pump housing die-casting molding equipment includes a frame 1 and an injection cylinder 2 located above the frame 1. A cylinder head 5 is movably connected inside the injection cylinder 2. The injection cylinder 2 is configured with a front chamber 3 and a rear chamber 4 on both sides of the cylinder head 5. Hydraulic oil flows through both the front chamber 3 and the rear chamber 4, which drives the cylinder head 5 to move inside the injection cylinder 2 to realize the die-casting molding process.

[0028] A stationary mold 13 is fixedly connected to the top of the frame 1. A central cavity 14 is opened inside the stationary mold 13. A connecting rod 6 is set on the side of the cylinder head 5 away from the rear adjustment part 8. The other end of the connecting rod 6 passes through the injection cylinder 2 and is slidably connected to the inner wall of the central cavity 14 through the punch. The cylinder head 5 moves inside the injection cylinder 2 and drives the connecting rod 6 to move. The connecting rod 6 moves inside the central cavity 14 and pushes the molten metal to flow through the punch. A moving mold 12 is movably connected to the side of the stationary mold 13 away from the injection cylinder 2. An ejector mechanism 10 is movably connected to the other side of the moving mold 12. The moving mold 12 and the stationary mold 13 cooperate and die-cast between them. After the die-casting is completed, the ejector mechanism 10 ejects the shell to complete the die-casting.

[0029] The front adjustment unit 7 is located above the injection cylinder 2 and communicates with the interior of the front cavity 3. It includes a front accumulator 701 for adjusting the amount of hydraulic oil inside the front cavity 3. The front adjustment unit 7 introduces hydraulic oil into the interior of the front cavity 3.

[0030] The front-end adjustment unit 7 also includes a front-end oil storage tank 702, which is fixedly connected to the top of the frame 1. The front-end oil storage tank 702 stores hydraulic oil, and the output end of the front-end oil storage tank 702 is connected to the upper input end of the front-end accumulator 701 through the pump body.

[0031] The front-end accumulator 701 is fixedly connected above the injection cylinder 2, and the output end of the front-end accumulator 701 is connected to the front chamber 3 through the oil pipe 703. The hydraulic oil inside the front chamber 3 is connected to the lower part of the front-end accumulator 701 through the oil pipe 703. The front-end accumulator 701 is also equipped with a front-end piston. The front-end oil tank 702 supplies hydraulic oil into the front-end accumulator 701. The hydraulic oil drives the front-end piston to squeeze the hydraulic oil below and move it downward. The hydraulic oil enters the front chamber 3 through the oil pipe 703, thereby realizing the adjustment of the amount of hydraulic oil inside the front chamber 3.

[0032] The rear adjustment unit 8, located on one side of the injection cylinder 2 and connected to the interior of the rear cavity 4, includes a rear accumulator 801. A high-speed gas tank 803 and a high-pressure gas tank 804 are connected above the rear accumulator 801 via a connecting pipe 802. The rear accumulator 801 is used to adjust the amount of hydraulic oil inside the rear cavity 4. Both the high-speed gas tank 803 and the high-pressure gas tank 804 contain compressed gas, such as nitrogen. The high-speed gas tank 803 is used to introduce high-speed gas into the rear accumulator 801 to achieve high-speed movement of the cylinder head 5. The high-pressure gas tank 804 introduces high-pressure gas into the rear accumulator 801 to achieve pressurization and compaction of the cylinder head 5.

[0033] The rear adjustment unit 8 also includes a manifold 805, one end of which is connected to the lower output end of the rear accumulator 801, and the other end passes through the injection cylinder 2 and is connected to the interior of the rear cavity 4. The hydraulic oil below the rear accumulator 801 enters the interior of the rear cavity 4 along the manifold 805 to drive the cylinder head 5 to move.

[0034] The lower part of the connecting pipe 802 is connected to the upper part of the rear accumulator 801. The upper part is connected to the high-speed gas tank 803 and the high-pressure gas tank 804 respectively through a three-way valve. The compressed gas stored in the high-speed gas tank 803 and the high-pressure gas tank 804 are connected to the upper part of the rear accumulator 801 through the connecting pipe 802. Therefore, when the cylinder head 5 needs to switch from high-speed filling to pressurization, the high-speed gas tank 803 stops supplying gas and the high-pressure gas tank 804 starts supplying gas.

[0035] The active part 9, which is movably connected inside the rear accumulator 801, includes a lower piston 901. An upper piston 902 is movably connected above the lower piston 901 via a buffer 907. Compressed gas is above the upper piston 902, and hydraulic oil is below the lower piston 901. The upper piston 902 moves downward to squeeze the buffer 907 and drive the lower piston 901 to move downward. When the air circuit is switched, the high-speed air tank 803 stops supplying air and the high-pressure air tank 804 starts supplying air. The buffer 907 is elastically released and elastically pushes the lower piston 901, further preventing fluctuations in the hydraulic oil during the switching process and affecting the subsequent die-casting effect of the molten metal.

[0036] The active part 9 also includes a sealing ring 903, which is fixedly connected to the outer surface of the lower piston 901 and the upper piston 902, and the other end is slidably connected to the inner wall of the rear accumulator 801. The sealing ring 903 improves the sealing performance between the lower piston 901 and the upper piston 902 and the inner wall of the rear accumulator 801, and prevents hydraulic oil or compressed gas from entering between them and affecting the normal sealing effect.

[0037] The upper part of the buffer 907 is connected to the lower part of the upper piston 902, and the lower part is connected to the upper part of the lower piston 901. The buffer 907 is elastic and stores elastic energy. The buffer 907 can be a disc spring damping buffer structure, which can withstand the compressive force between the lower piston 901 and the upper piston 902 and achieve elastic reset.

[0038] The top cavity 910 is located above the lower piston 901, and the upper piston 902 is slidably connected to the top cavity 910. The outer surface of the upper piston 902 is provided with a limiting member 911, and the inner wall of the top cavity 910 is provided with a limiting groove. The limiting member 911 slides within the limiting groove, thereby facilitating the limiting movement of the upper piston 902 and the lower piston 901. In actual use, an exhaust pipe (not shown in the figure) can be provided inside the upper piston 902. The bottom of the exhaust pipe is connected to the inside of the top cavity 910, and the side wall of the exhaust pipe is connected to the upper piston 902 and the lower piston 901. At the same time, the top of the exhaust pipe passes through the top of the rear accumulator 801 and is connected to the outside, thereby enabling the flow of gas between the upper piston 902 and the lower piston 901 and preventing it from hindering the normal elastic buffering of the buffer member 907.

[0039] A distance sensor 909 is installed below the upper piston 902 to detect the distance between the lower part of the upper piston 902 and the lower part of the top cavity 910. A hydraulic sensor 11 is installed inside the rear cavity 4 to detect the hydraulic pressure inside the rear cavity 4. At the same time, a displacement sensor is installed at the end of the injection cylinder 2 to detect the movement distance of the punch inside the central cavity 14, thereby determining the die-casting position. In specific use, a hydraulic sensor 11 can also be installed inside the front cavity 3 to detect the hydraulic oil inside the front cavity 3. A control system is installed on one side of the frame 1 to detect various data and electrically control various electrical components.

[0040] When using, such as Figure 4 The orientation is set. In the initial state, the cylinder head 5 is located in the initial position inside the injection cylinder 2, and the front chamber 3 and the rear chamber 4 are both filled with hydraulic oil. The hydraulic value detected by the hydraulic sensor 11 is the preset hydraulic value, and the distance value detected by the distance sensor 909 is the preset distance value. All components are in the initial air supply state.

[0041] When die casting is required, the moving mold 12 moves closer to the stationary mold 13 and merges with the stationary mold 13 to close the mold. The high-speed gas inside the high-speed gas tank 803 is introduced into the rear accumulator 801 at low speed through the connecting pipe 802. The amount of compressed gas above the upper piston 902 increases continuously and drives the upper piston 902 to move downward. The upper piston 902 moves to correspond to the extrusion buffer 907 and drives the lower piston 901 to move downward. The lower piston 901 pushes the hydraulic oil below and causes it to enter the rear cavity 4 through the manifold 805. The amount of hydraulic oil in the rear cavity 4 increases and pushes the cylinder head 5 to move to the left along the injection cylinder 2. At this time, the hydraulic oil in the front cavity 3 flows back to the front accumulator 701 through the oil pipe 703 to wait for subsequent use. When the cylinder head 5 moves, it simultaneously drives the connecting rod 6 to move and moves along the central cavity 14 through the end punch. This movement process is a low-speed process, thereby expelling the gas between the moving mold 12 and the stationary mold 13.

[0042] After traveling a distance at low speed, the compressed gas inside the high-speed gas tank 803 enters the rear accumulator 801 at an ever-increasing speed. The corresponding cylinder head 5 drives the connecting rod 6 to move along the central cavity 14 at an ever-increasing speed, thereby achieving a high-speed filling process. During the above process, the cylinder head 5 moves stably. When the upper piston 902 squeezes the buffer 907 and drives the lower piston 901 to move downward, the buffer 907 elastically stores energy. The distance value detected by the distance sensor 909 decreases to the first preset distance value. This preset value can be obtained through multiple experiments, which will not be elaborated here. The displacement sensor at the end of the injection cylinder 2 detects the movement distance of the punch, thereby determining the die-casting position.

[0043] When the molten metal completes high-speed filling and needs to switch to pressurized filling, the high-speed gas tank 803 stops supplying gas, and the high-pressure gas tank 804 starts and introduces high-pressure compressed gas into the rear accumulator 801 through the connecting pipe 802. During the switching process, the rear accumulator 801 is filled with compressed gas, which has extremely high compressibility, increasing exponentially compared to hydraulic oil. Therefore, during the switching of the air circuit, the instantaneous pause of the lower piston 901 and the upper piston 902 will not cause changes in the hydraulic pressure inside the rear accumulator 801 due to the compressibility of the compressed gas. Correspondingly, the thrust exerted by the rear accumulator 801 on the hydraulic oil inside the rear chamber 4 will not change, and the thrust exerted by the cylinder head 5 on the molten metal inside the central chamber 14 through the connecting rod 6 will also not change. This further ensures the stability and smoothness of the molten metal flow inside the moving mold 12 and the stationary mold 13, and avoids the molten metal from momentarily stagnating and cooling, which could cause problems such as internal shrinkage cavities and leakage in the brake pump housing.

[0044] Meanwhile, during the conversion process, as the squeezing force of the upper piston 902 on the buffer 907 decreases, the energy stored in the buffer 907 is released and a downward elastic squeezing force is applied to the lower piston 901. With the help of the elastic release of the buffer 907 and the compressibility of the compressed gas, the hydraulic stability during the gas circuit switching process is further improved, and the reverse fluctuation of the lower piston 901 is avoided, which would affect the fluidity of the subsequent molten metal.

[0045] Compressed gas inside the high-pressure gas tank 804 enters the rear accumulator 801 through the connecting pipe 802 and applies high-pressure thrust to the top of the upper piston 902. The deformation of the corresponding buffer 907 increases and applies high-pressure thrust to the lower piston 901. The distance value detected by the distance sensor 909 decreases and reaches the set second distance preset value, which is less than the first distance preset value. At the same time, the hydraulic oil at the bottom of the lower piston 901 applies high-pressure thrust to the right end of the cylinder head 5 through the manifold 805 with the help of the hydraulic oil inside the rear cavity 4. The hydraulic value detected by the hydraulic sensor 11 reaches the set second hydraulic preset value, which is greater than the set first hydraulic preset value. The cylinder head 5 applies high-pressure thrust to the molten metal inside the central cavity 14 through the connecting rod 6, thereby achieving pressurization and compaction of the molten metal inside the moving mold 12 and the stationary mold 13, so that the molten metal can fully fill the space between them and meet the die-casting requirements.

[0046] Furthermore, this pressurization and compaction process spans the cooling process of the molten metal between the moving mold 12 and the stationary mold 13, which takes a relatively long time. In addition, the hydraulic oil inside the rear cavity 4 constantly applies thrust to the cylinder head 5. The distance value detected by the distance sensor 909 and the hydraulic value detected by the hydraulic sensor 11 correspond to each time point in the die casting process. The specific values ​​mentioned above can be obtained through multiple experiments, which will not be elaborated here.

[0047] When the hydraulic value detected by the hydraulic sensor 11 is less than the hydraulic value set at the corresponding position, and the distance value detected by the distance sensor 909 is greater than the distance value set at the corresponding position, it indicates that the hydraulic thrust at that position is insufficient. The corresponding high-pressure gas tank 804 increases the amount of high-pressure compressed gas introduced into the rear accumulator 801, thereby increasing the thrust exerted by the hydraulic oil inside the rear cavity 4 on the cylinder head 5, and correspondingly increasing the pressurization and compaction effect on the molten metal inside the central cavity 14.

[0048] Furthermore, after the high-pressure air tank 804 replenishes the air, the hydraulic value detected by the hydraulic sensor 11 is still less than the hydraulic value set at the corresponding position, and the distance value detected by the distance sensor 909 is still greater than the distance value set at the corresponding position, indicating that the hydraulic oil inside the rear cavity 4 is leaking. At this time, it is necessary to stop the machine in time and inspect and maintain the sealing of the rear cavity 4.

[0049] When the hydraulic value detected by the hydraulic sensor 11 is greater than the hydraulic value set at the corresponding position, and the distance value detected by the distance sensor 909 is less than the distance value set at the corresponding position, it indicates that the hydraulic thrust at that position is too large. The corresponding high-pressure gas tank 804 can reduce the amount of high-pressure compressed gas supplied to the rear accumulator 801.

[0050] When the hydraulic value detected by the hydraulic sensor 11 is less than the hydraulic value set at the corresponding position, and the distance value detected by the distance sensor 909 is less than the distance value set at the corresponding position, it indicates that there is a blockage between the manifolds 805, and the hydraulic oil inside the rear accumulator 801 cannot smoothly reach the rear chamber 4. At this time, in order to ensure the stability of the thrust, the high-pressure gas tank 804 introduces more high-pressure compressed gas into the rear accumulator 801, thereby enabling the hydraulic oil to flow smoothly and providing thrust.

[0051] When the hydraulic value detected by the hydraulic sensor 11 is greater than the hydraulic value set at the corresponding position, and the distance value detected by the distance sensor 909 is greater than the distance value set at the corresponding position, and the distance value does not reach the minimum distance value and cannot change, it indicates that the buffer 907 between the lower piston 901 and the upper piston 902 is stuck and has lost its elastic deformation. Therefore, it is still necessary to stop the machine for inspection and maintenance.

[0052] After pressurization and compaction are completed, the controller stops the high-pressure gas tank 804 from supplying gas, and the front oil tank 702 starts supplying gas and introduces hydraulic oil into the front accumulator 701. The front accumulator 701 introduces hydraulic oil into the front cavity 3 along the oil pipe 703 and drives the cylinder head 5 to move to the right to return to its original position. During the movement of the cylinder head 5, the hydraulic oil in the rear cavity 4 is squeezed and flows back to the lower part of the rear accumulator 801 along the manifold 805. Under the thrust of the hydraulic oil below, the lower piston 901 drives the upper piston 902 to move upward to return to its original position through the buffer 907. The compressed gas in the rear accumulator 801 flows back to the high-speed gas tank 803 and the high-pressure gas tank 804 along the connecting pipe 802 to wait for subsequent use. All components return to normal. The above process can be repeated during subsequent die casting.

[0053] Example 2 During the die-casting process of the brake pump housing as described above, the buffer 907 elastically releases and applies an elastic thrust to the lower piston 901 during the air circuit switching process. However, due to a momentary pause during the air circuit switching process, neither the high-speed air tank 803 nor the high-pressure air tank 804 supplies compressed gas to the rear accumulator 801. Therefore, the buffer 907 also applies an elastic force to the upper piston 902, causing it to shift, thereby reducing the downward pushing effect on the lower piston 901. Furthermore, the compressed gas enters the rear accumulator 801 and drives the lower piston 901 and the upper piston 902. 02 During movement, the compressed gas is compressed and its temperature changes accordingly. Especially when the high-pressure gas tank 804 introduces high-pressure compressed gas into the rear accumulator 801, the compression of the compressed gas increases further and the temperature rises accordingly. This temperature change not only affects the normal expansion of the compressed gas and hydraulic oil, but also affects the durability of the sealing ring 903 and the buffer 907. Furthermore, the sealing ring 903 requires greater sealing force under the high-pressure compressed gas to prevent leakage of the compressed gas and to avoid affecting the adjustment effect of the movement between the lower piston 901 and the upper piston 902.

[0054] To solve the above problems, the movable part 9 in a brake pump housing die-casting molding equipment further includes a lubrication groove 904, which is opened on the outer surface of the lower piston 901 for the flow of lubricating fluid. The lubricating fluid flowing inside the lubrication groove 904 not only has a lubricating effect, but also cools the lower piston 901, thereby ensuring the normal air supply state of the lower piston 901. Furthermore, the lubrication groove 904 is located between the upper and lower sealing rings 903, so the lubricating fluid flowing inside the lubrication groove 904 flows inside the lubrication groove 904 and will not come into contact with hydraulic oil or compressed gas.

[0055] Furthermore, the lower piston 901 has multiple docking holes 905 evenly distributed inside, and the upper piston 902 has multiple return holes 913 evenly distributed inside. The docking holes 905 and the return holes 913 are staggered and connected. The docking holes 905 and the return holes 913 are opened with relevant dimensions according to the requirements. While meeting the processing requirements, the fluidity of the internal lubricant is guaranteed. The upper piston 902 moves up and down along the top cavity 910 and drives the docking holes 905 to move accordingly. The change in the overlapping area of ​​the docking holes 905 and the return holes 913 adjusts the amount of lubricant inside the lubrication groove 904 accordingly.

[0056] The inlet pipe 906 is fixedly connected above the upper piston 902. The upper part of the inlet pipe 906 passes above the rear accumulator 801 and is connected to the output end of the lubricating fluid tank through the pump body. The lower part is connected to the return hole 913. The inlet pipe 906 introduces lubricating fluid into the lower return hole 913. The other end of the return hole 913 is misaligned with the docking hole 905 and introduces lubricating fluid into the lubrication tank 904.

[0057] The outlet pipe 912 is fixedly connected above the upper piston 902. The upper part of the outlet pipe 912 passes through the upper part of the rear accumulator 801 and is connected to the input end of the lubricating fluid tank through the pump body. The lower part is connected to the return hole 913. The lubricating fluid inside the lubrication tank 904, after flowing heat exchange, flows back to the outlet pipe 912 through the docking hole 905 and the return hole 913 at the other end and is finally discharged. The inlet pipe 906 and the outlet pipe 912 are both connected to the lubricating fluid tank through the circulating pump body. The inlet pipe 906 and the outlet pipe 912 can exchange heat with the compressed gas inside the rear accumulator 801 for cooling. The outer surfaces of the inlet pipe 906 and the outlet pipe 912 are sealed and slidably connected to the inner wall of the rear accumulator 801 through the sealing ring 903, so that the inlet pipe 906 and the outlet pipe 912 move synchronously with the movement of the upper piston 902.

[0058] The friction ring 908 is fixedly connected to the inner wall of the rear accumulator 801 and corresponds to the sealing ring 903 on the outer surface of the upper piston 902. The friction force of the friction ring 908 gradually increases from top to bottom. It can be configured as a frustum-shaped structure with a width that gradually increases from top to bottom. Since the friction ring 908 is located between the lower piston 901 and the upper piston 902 for a long time, it will not be damaged by compressed gas or hydraulic oil. However, when the air circuit is switched, the sealing ring 903 on the outer surface of the upper piston 902 and the friction ring 908 squeeze each other, increasing the friction between them. When the buffer 907 elastically releases, the upper piston 902 is subjected to a greater limiting force. The buffer 907 then applies a spring force to the lower piston 901, causing the lower piston 901 to maintain a constant thrust on the hydraulic oil below. Subsequently, when the high-pressure compressed gas inside the high-pressure gas tank 804 enters the rear accumulator 801, the upper piston 902 moves downward and increases the friction limiting force with the friction ring 908. The friction of the friction ring 908 helps to prevent the compressed gas from having excessive kinetic energy and causing the upper piston 902 to move downward too much, which would affect the stability of the subsequent die-casting of the molten metal.

[0059] In use, when the high-speed gas tank 803 starts to introduce high-speed compressed gas into the rear accumulator 801, the circulation pump of the lubricating fluid tank starts and introduces lubricating fluid into the inlet pipe 906. The lubricating fluid in the inlet pipe 906 flows into the lubrication tank 904 through the misaligned connection between the return hole 913 and the docking hole 905. At the same time, the lubricating oil in the lubrication tank 904 flows to the other end and flows back to the outlet pipe 912 through the docking hole 905 and the return hole 913 at the other end. Finally, it is discharged into the rear accumulator 801 through the outlet pipe 912, thereby realizing the circulating lubrication and cooling of the lower piston 901, which facilitates the stability of the lower piston 901's movement inside the rear accumulator 801.

[0060] When the high-speed compressed gas drives the upper piston 902 downward to the switching position, the sealing ring 903 and friction ring 908 on the outer surface of the upper piston 902 elastically compress and limit it. At this time, the high-speed gas tank 803 stops supplying gas and the high-pressure gas tank 804 starts supplying gas. At the moment of switching of the gas path, the amount of compressed gas above the upper piston 902 stops momentarily, and the buffer 907 is no longer compressed by the upper piston 902 and begins to release elastically. Since the upper piston 902 is sealed and frictionally limited by the friction ring 908 and the sealing ring 903, and the upper piston 902 is compressed and limited by the compressed gas, the upper piston 902 will not be displaced. The elastic release force of the buffer 907 mainly acts on the top of the lower piston 901 and applies a downward thrust to the lower piston 901, thereby ensuring that the molten metal is thrust at the moment of switching of the gas path and will not fluctuate in the opposite direction, further improving the stability and efficiency of the brake pump housing die casting.

[0061] When the high-pressure compressed gas inside the high-pressure gas tank 804 instantly enters the rear accumulator 801, it applies a thrust to the upper piston 902. At this time, the elastic friction between the sealing ring 903 and the friction ring 908 on the outer surface of the upper piston 902 further buffers this instantaneous thrust. Correspondingly, the buffer component 907 provides elastic buffering of the thrust applied to the lower piston 901, preventing a sudden increase in the amount of compressed gas inside the rear accumulator 801 from impacting the upper piston 902 and the lower piston 901 and causing fluctuations in the hydraulic oil below, thereby affecting the stability and efficiency of the hydraulic oil output.

[0062] Furthermore, when the piston 901 moves downward a certain distance under the elastic release of the buffer 907, the hydraulic value detected by the distance sensor 909 increases, and the amount of high-pressure compressed gas from the high-pressure gas tank 804 into the rear accumulator 801 increases. Then, the high-pressure compressed gas applies a thrust to the upper piston 902, causing it to squeeze the buffer 907 and move downward.

[0063] Then, under the stable thrust of the high-pressure compressed gas, the upper piston 902 squeezes the buffer 907 and continues to drive the lower piston 901 to move downward and apply thrust to the hydraulic oil. At this time, due to the high-pressure environment, the upper piston 902 and the lower piston 901 squeeze the buffer 907 and move closer to each other. The distance value detected by the distance sensor 909 decreases to the second preset distance value.

[0064] The corresponding upper piston 902 drives the return hole 913 to move downwards, increasing the overlap area between the return hole 913 and the docking hole 905. At this time, the amount of lubricating fluid entering the lubrication tank 904 through the inlet pipe 906 along the return hole 913 and the docking hole 905 increases. The amount of lubricating fluid flowing inside the lubrication tank 904 and returning to the outlet pipe 912 along the return hole 913 and the docking hole 905 at the other end increases. Therefore, the amount of lubricating fluid remaining in the inlet pipe 906, the lubrication tank 904, and the outlet pipe 912 increases accordingly. This not only improves the lubrication effect on the lower piston 901's compression and sliding but also increases the heat exchange and cooling effect on the accumulator 801 at the rear end, enabling it to maintain a stable temperature under high-pressure compressed gas conditions. This avoids the temperature changes affecting the expansion of the compressed gas and hydraulic oil and ultimately affecting the thrust on the molten metal.

[0065] After the molten metal is die-cast, demolding can be performed and the above process can be repeated.

[0066] Example 3 A method for die-casting a brake pump housing, comprising the following steps: (The method utilizes a brake pump housing die-casting equipment to die-cast the brake pump housing.) S1. When die casting begins, the high-speed gas tank 803 starts supplying gas and through the connecting pipe 802, the high-speed compressed gas is sent into the rear accumulator 801. The upper piston 902 squeezes the buffer 907 and drives the lower piston 901 to move downward. The lower piston 901 pushes the hydraulic oil into the rear chamber 4 and drives the cylinder head 5 to move.

[0067] S2. When the molten metal is switched from high-speed filling to pressurization, the high-speed gas tank 803 stops supplying gas and the high-pressure gas tank 804 starts supplying gas. The high-pressure compressed gas inside the high-pressure gas tank 804 enters the rear accumulator 801 along the connecting pipe 802 and applies high-pressure thrust to the upper piston 902.

[0068] S201. During the air circuit switching process, the compressed gas applies a thrust to the upper piston 902 and, in conjunction with the elastic release of the buffer 907, applies a thrust to the lower piston 901. The lower piston 901 maintains a thrust on the hydraulic oil.

[0069] S202, the high-pressure compressed gas increases the thrust applied to the upper piston 902 and decreases the distance between it and the lower piston 901. The overlapping area of ​​the docking hole 905 and the return hole 913 increases, and the amount of lubricating fluid flowing inside the inlet pipe 906, the lubrication groove 904 and the outlet pipe 912 increases.

[0070] S3. After die casting is completed, both the high-speed gas tank 803 and the high-pressure gas tank 804 stop supplying gas. The front-end accumulator 701 introduces hydraulic oil into the front cavity 3 and drives the cylinder head 5 to move in the opposite direction to reset.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brake pump housing die-casting equipment, comprising a frame (1) and an injection cylinder (2) above the frame (1), an inner movable connection of the injection cylinder (2) is provided with a cylinder head (5), the inside of the injection cylinder (2) and both sides of the cylinder head (5) are respectively provided with a front cavity (3) and a rear cavity (4), characterized in that, Also includes: The front adjustment unit (7), which is located above the injection cylinder (2) and communicates with the interior of the front chamber (3), includes a front accumulator (701) for adjusting the amount of hydraulic oil inside the front chamber (3); The rear adjustment section (8) is located on one side of the injection cylinder (2) and is connected to the interior of the rear cavity (4). It includes a rear accumulator (801). A high-speed gas tank (803) and a high-pressure gas tank (804) are connected above the rear accumulator (801) through a connecting pipe (802). The active part (9) is movably connected to the interior of the rear accumulator (801), including a lower piston (901). An upper piston (902) is movably connected above the lower piston (901) via a buffer (907). The upper piston (902) moves downward to squeeze the buffer (907) and drive the lower piston (901) to move downward. When the air circuit is switched, the high-speed air tank (803) stops supplying air and the high-pressure air tank (804) starts supplying air. The buffer (907) is elastically released and elastically pushes the lower piston (901).

2. The brake pump housing die casting apparatus according to claim 1, wherein The front-end adjustment section (7) further includes: The front oil storage tank (702) is fixedly connected to the top of the frame (1), and the output end of the front oil storage tank (702) is connected to the upper input end of the front accumulator (701) through the pump body; The front accumulator (701) is fixedly connected above the injection cylinder (2), and the output end of the front accumulator (701) is connected to the front cavity (3) through the oil pipe (703). The hydraulic oil inside the front cavity (3) is connected to the lower part of the front accumulator (701) through the oil pipe (703).

3. The brake pump housing die-casting equipment according to claim 1, characterized in that, The rear adjustment unit (8) further includes: The manifold (805) has one end connected to the lower output end of the rear accumulator (801), and the other end passes through the injection cylinder (2) and is connected to the interior of the rear cavity (4). The lower part of the connecting pipe (802) is connected to the upper part of the rear accumulator (801), and the upper part is connected to the high-speed gas tank (803) and the high-pressure gas tank (804) respectively through a three-way valve. The compressed gas stored inside the high-speed gas tank (803) and the high-pressure gas tank (804) are connected to the upper part of the rear accumulator (801) through the connecting pipe (802).

4. The brake pump housing die-casting equipment according to claim 1, characterized in that, The active section (9) also includes: The sealing ring (903) is fixedly connected to the outer surface of the lower piston (901) and the upper piston (902), and the other end is in a sealing sliding connection with the inner wall of the rear accumulator (801). The upper part of the buffer (907) is connected to the lower part of the upper piston (902), and the lower part is connected to the upper part of the lower piston (901). The buffer (907) is elastic and performs elastic energy storage.

5. The brake pump housing die-casting equipment according to claim 1, characterized in that, The active section (9) also includes: A lubrication groove (904) is formed on the outer surface of the lower piston (901) for the flow of lubricating fluid. Multiple docking holes (905) are uniformly formed inside the lower piston (901), and multiple return holes (913) are uniformly formed inside the upper piston (902). The docking holes (905) and the return holes (913) are staggered and connected. The inlet pipe (906) is fixedly connected above the upper piston (902), and the upper part of the inlet pipe (906) passes through the upper part of the rear accumulator (801) and is connected to the output end of the lubricating liquid tank through the pump body, and the lower part is connected to the upper part of the return hole (913). The outlet pipe (912) is fixedly connected above the upper piston (902), and the upper part of the outlet pipe (912) passes through the upper part of the rear accumulator (801) and is connected to the input end of the lubricating fluid tank through the pump body, and the lower part is connected to the return hole (913).

6. The brake pump housing die-casting equipment according to claim 1, characterized in that, The active section (9) also includes: The friction ring (908) is fixedly connected to the inner wall of the rear accumulator (801) and corresponds to the sealing ring (903) on the outer surface of the upper piston (902). The friction force of the friction ring (908) gradually increases from top to bottom. The top cavity (910) is located above the lower piston (901), and the upper piston (902) is slidably connected to the top cavity (910).

7. The brake pump housing die-casting equipment according to claim 6, characterized in that, A distance sensor (909) is provided below the upper piston (902) to detect the distance between the lower part of the upper piston (902) and the lower part of the top cavity (910). A hydraulic sensor (11) is provided inside the rear cavity (4) to detect the hydraulic value inside the rear cavity (4).

8. The brake pump housing die-casting equipment according to claim 1, characterized in that, A stationary mold (13) is fixedly connected to the top of the frame (1). A central cavity (14) is opened inside the stationary mold (13). A connecting rod (6) is provided on the side of the cylinder head (5) away from the rear adjustment part (8). The other end of the connecting rod (6) passes through the injection cylinder (2) and is sealed and slidably connected to the inner wall of the central cavity (14) through the punch. A moving mold (12) is movably connected on the side of the stationary mold (13) away from the injection cylinder (2). An ejection mechanism (10) is movably connected on the other side of the moving mold (12).

9. A method for die-casting a brake pump housing, wherein the die-casting method utilizes a brake pump housing die-casting equipment as described in claim 5 to die-cast the brake pump housing, characterized in that, Includes the following steps: S1. When die casting begins, the high-speed gas tank (803) starts supplying gas and through the connecting pipe (802) to the rear accumulator (801) via high-speed compressed gas. The upper piston (902) squeezes the buffer (907) and drives the lower piston (901) to move downward. The lower piston (901) pushes the hydraulic oil into the rear chamber (4) and drives the cylinder head (5) to move. S2. When the molten metal is switched from high-speed filling to pressurization, the high-speed gas tank (803) stops supplying gas and the high-pressure gas tank (804) starts supplying gas. The high-pressure compressed gas inside the high-pressure gas tank (804) enters the back-end accumulator (801) along the connecting pipe (802) and applies high-pressure thrust to the upper piston (902). S3. After die casting is completed, both the high-speed gas tank (803) and the high-pressure gas tank (804) stop supplying gas. The front-end accumulator (701) introduces hydraulic oil into the front cavity (3) and drives the cylinder head (5) to move in the opposite direction to reset.

10. The method for die-casting a brake pump housing according to claim 9, characterized in that, S2 also includes: S201. During the air circuit switching process, the compressed gas applies a thrust to the upper piston (902) and, in conjunction with the elastic release of the buffer (907), applies a thrust to the lower piston (901). The lower piston (901) maintains a thrust on the hydraulic oil. S202, the high-pressure compressed gas increases the thrust applied to the upper piston (902) and decreases the distance between it and the lower piston (901), the overlapping area of ​​the docking hole (905) and the return hole (913) increases, and the amount of lubricating fluid flowing inside the inlet pipe (906), the lubrication groove (904) and the outlet pipe (912) increases.

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