Lightweight aluminum piston automatic casting machine

Abstract

The present application relates to the technical fields of piston casting, in particular to a kind of lightweight aluminum piston automatic casting machine, to cast with positioning table piston blank, including lower mould, left mould and right mould, the left mould is slid in the left side of lower mould, the right mould is slid in the right side of lower mould, and right mould and left mould are wrapped lower mould when adhering, it also includes upper mould and cooling cone, the upper mould is inserted between left mould and right mould, and upper mould inside is equipped with reference forming groove, the reference forming groove is through upper mould, and reference forming groove is coaxial with upper mould, the cooling cone is located in the top of upper mould.The present application is connected with the outside by metal liquid, and the connection is set in multiple levels, which achieves the purpose of timely discharging gas, improves the speed of piston cooling forming, and optimizes the structure of piston.

Description

Technical Field

[0001] This invention relates to the field of piston casting technology, specifically to a lightweight automatic aluminum piston casting machine. Background Technology

[0002] Pistons are reciprocating components in the cylinder block of a car, and their performance directly affects the engine's output capability. Therefore, with the increasing demands for various car performance requirements, different types of pistons have been gradually developed, and lightweight aluminum pistons are one of them.

[0003] The production process of cast pistons includes blank casting and subsequent finishing. In piston casting, combined molds are commonly used. First, several fixed molds and moving molds are combined to form an upward-opening cavity. Then, a specified amount of molten metal is poured into the cavity. Next, the mold located above the cavity is quickly pressed down to form the forming space of the piston blank. After that, the piston blank is cooled and formed and then removed for further processing.

[0004] However, during the pressing of the mold, the air inside the cavity is continuously compressed. Due to the sliding seal connection between the pressing mold and other molds, the compressed gas cannot be discharged in time, resulting in the following consequences: First, some gas merges into the molten metal, causing a large number of air bubbles in the molten metal, which in turn leads to a large number of pores in the formed piston blank, thus affecting the quality of the piston. Second, residual gas above the surface of the molten metal makes the surface of the molten metal uneven, which in turn causes a large number of burrs on the end face of the formed piston blank. Moreover, the lightweight aluminum piston itself has a thinner wall thickness (in order to reduce weight, the wall thickness of the piston top, skirt and ring land area is further reduced) and a more complex internal structure (in order to ensure structural strength and heat dissipation performance, complex internal cavity structures such as internal cooling oil channels and reinforcing ribs are commonly used), which makes the problem of "difficulty in venting" more prominent. First, a large number of pores will further reduce the structural strength of the thin wall. Second, the machining allowance for burrs on the thin wall is further compressed, which in turn increases the machining difficulty.

[0005] Therefore, a lightweight automatic aluminum piston casting machine is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a lightweight automatic aluminum piston casting machine, which solves the problem of gas not being able to be discharged from the piston casting chamber in a timely manner. By connecting the molten metal to the outside and setting up a multi-stage connection, the purpose of timely gas discharge is achieved, while improving the speed of piston cooling and forming and optimizing the piston structure.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A lightweight aluminum piston automatic casting machine is used to cast piston blanks with positioning platforms. It includes a lower mold, a left mold, and a right mold. The left mold slides to the left of the lower mold, and the right mold slides to the right of the lower mold. When the right mold and the left mold are in contact, they wrap around the lower mold. It also includes an upper mold and a cooling cone. The upper mold is inserted between the left mold and the right mold, and a reference forming groove is provided inside the upper mold. The reference forming groove passes through the upper mold and is coaxial with the upper mold. The cooling cone is located above the upper mold.

[0009] The left mold moves to the right and the right mold moves to the left to form a cavity for containing molten metal. The upper mold moves down to compress the molten metal in the cavity and form a forming space for the piston blank. The reference forming groove contains the molten metal that is pressed upward and serves as a channel for the rising and discharge of air bubbles. The cooling cone contacts the hot air rising along the reference forming groove to accelerate the cooling of the piston blank.

[0010] The lower groove is used for the positioning table forming. The piston blank obtained by the casting process needs to be processed later (since the piston blank is a rotating structure, its subsequent processing is mostly done with the help of a lathe) to obtain the final product. During the processing, the lathe tip needs a positioning reference. Therefore, a positioning groove is often machined on the end face of the piston as a positioning reference. However, in actual use, the positioning groove will weaken the structural strength of the piston.

[0011] Preferably, the reference forming groove includes an upper groove and a lower groove from top to bottom, and the cross-sectional area of ​​the upper groove is smaller than that of the lower groove;

[0012] The above scheme utilizes a lower groove forming positioning table, which serves as part of the piston blank during processing. A positioning groove is formed on the table. After processing, the positioning table is removed by machining. After the removed positioning table is heated and melted, it can continue to be used as raw material for casting the piston blank. The function of the upper groove is to allow the molten metal immersed in the lower groove to continue to rise, thereby increasing the pressure of the molten metal in the cavity below the upper mold. This increases the casting pressure of the effective part of the piston blank (excluding the positioning table and the part above the positioning table), thereby enhancing the structural strength of the piston blank and providing a channel for the release of air bubbles in the molten metal. Since the pressure is lower closer to the surface of the molten metal, the air bubbles in the molten metal will concentrate towards the surface and then burst, releasing the gas.

[0013] Preferably, the lower groove is configured as a frustum-shaped structure, with the minor diameter of the lower groove at the top;

[0014] In the above scheme, the lower groove is set as a frustum-shaped structure with the smaller diameter at the top. On the one hand, the frustum-shaped structure, as a rotating body, is more convenient for subsequent machining. On the other hand, compared with the cylindrical structure, the frustum-shaped structure effectively reduces the volume of the positioning platform, thereby reducing the total amount of positioning platform recovery and allowing more molten metal to directly participate in the effective casting of the piston blank, thus improving production efficiency. In addition, the frustum-shaped structure also makes it easier for the positioning platform to separate from the lower groove, thereby improving demolding efficiency.

[0015] Preferably, the upper groove is configured as a frustum-shaped structure, with the major diameter of the upper groove at the bottom, the major diameter of the upper groove being smaller than the minor diameter of the lower groove, and the height of the upper groove being greater than the height of the lower groove.

[0016] In the above scheme, setting the upper groove as a frustum structure also promotes demolding, facilitates machining, and reduces the total amount of recycling. In addition, the upper groove can also form a chimney effect by its own height, which can accelerate the discharge of high-temperature gases in the molten metal. This can reduce the amount of residual bubbles in the molten metal, so that the formed piston blank has higher structural strength. It can also accelerate the cooling of the molten metal, thereby accelerating the forming of the piston blank. Furthermore, since there is a long upper groove between the external cold source and the effective part of the piston blank, a certain temperature gradient is formed, which avoids local sudden cooling of the effective part of the piston blank, thus ensuring the structural strength of the formed piston blank.

[0017] The diameter of the upper tank should be as small as possible. On the one hand, a smaller upper tank diameter means a smaller volume, which reduces the total amount of molten metal recovered. On the other hand, a smaller upper tank diameter means that when the same amount of molten metal is poured into the upper tank, the liquid level is higher, which in turn means that the hydraulic pressure of the molten metal in the cavity below the upper mold is greater, thus making the effective part of the piston blank more structurally strong. However, as the diameter of the upper tank decreases, the diameter of the structure formed by the upper tank also decreases, and this structure will cool rapidly due to the chimney effect formed by the upper tank, which may lead to local fracture. Therefore, the demolding process of this part should be designed accordingly.

[0018] Preferably, the upper mold includes a fixed mold and a moving mold from top to bottom, the moving mold is slidably connected to the fixed mold, and the two moving molds are detachably connected, the upper groove is located inside the moving mold, and the lower groove is located inside the fixed mold;

[0019] With the above solution, when the structure formed by the upper groove breaks and gets stuck inside the upper groove, the two moving molds can slide on the fixed mold to separate the upper groove in half, thereby removing the broken part.

[0020] Preferably, the cooling cone is mounted on the fixed mold, and the cooling cone is configured as an inverted cone shape, and the cooling cone is coaxial with the lower groove;

[0021] In the above scheme, on the one hand, the cooling cone exchanges heat with the hot gas discharged from the upper tank to increase the cooling rate of the molten metal and thus improve the casting efficiency of the piston blank. On the other hand, the cooling cone is coaxial with the lower tank, that is, when the two moving molds are in contact, the cooling cone is located directly above the upper tank. Thus, the upper bottom surface of the cooling cone blocks external dust to ensure the purity of the mold interior.

[0022] Preferably, the cooling cone is hollow inside and filled with coolant to further improve its cooling performance.

[0023] Preferably, the cooling cone is provided with an inlet pipe and an outlet pipe. The outlet of the inlet pipe is below the inlet of the outlet pipe, so that the coolant discharged from the inlet pipe is first concentrated at the tip of the cooling cone to improve the heat exchange effect between the cooling cone and the hot air discharged from the upper tank. The heated coolant rises and is discharged from the inlet of the outlet pipe.

[0024] Adjusting the composition and proportion of molten metal usually places different requirements on the cooling process of the molten metal.

[0025] Preferably, the cooling cone is slidably connected to the fixed mold, and different cooling effects can be achieved by adjusting the height of the cooling cone.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This invention constructs a channel connecting the casting cavity to the outside by setting a through-type forming groove inside the upper mold and setting a cooling cone above it. This channel can smoothly discharge the compressed gas and air bubbles that have merged into the molten metal inside the cavity, thereby solving the problems of air holes and burrs on the end face of the piston blank caused by the inability of gas to be discharged in the prior art, and significantly improving the density and quality of the piston casting. At the same time, the cooperation between the cooling cone and the channel accelerates the cooling and forming of the piston and improves production efficiency.

[0028] 2. The reference forming groove of the present invention includes an upper groove and a lower groove. The upper groove, which has a small cross-sectional area and a large height, not only creates a "chimney effect" to accelerate the discharge of hot gas, but more importantly, it can throttle and impede the molten metal entering the reference forming groove, thereby greatly increasing the pressure of the molten metal in the main cavity below. This makes the effective part of the final formed piston more compact and has higher structural strength. The positioning platform formed by the lower groove serves as a temporary reference for the subsequent finishing of the piston blank. After the finishing is completed, it can be removed and recycled, avoiding the problem of weakening the final structural strength by setting a permanent positioning groove on the piston body. This achieves a balance between casting quality optimization and processing convenience.

[0029] 3. The cooling cone in this invention uses internally circulating coolant to efficiently exchange heat with the high-temperature gas discharged from the upper tank. While improving the cooling speed and shortening the production cycle, it also causes the slender metal rods formed in the upper tank to become brittle due to rapid cooling. Correspondingly, this invention ensures that the brittle metal rods can be reliably removed through the design of the upper mold. If the metal rod breaks and gets stuck in the upper tank, the broken part can be easily removed by separating the moving mold. This effectively solves the mold jamming problem that may be caused by the exhaust structure, thereby enhancing the reliability of equipment operation and the stability of continuous production. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall isometric structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the casting piston state of the present invention;

[0033] Figure 4 For the present invention Figure 3 Enlarged diagram of part A in the middle;

[0034] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the fixed mold of the present invention;

[0035] Figure 6 This is a schematic diagram of the moving mold in the open state of the present invention;

[0036] Figure 7 This is a schematic diagram of the cooling cone structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the piston blank in a single separation state according to the present invention;

[0038] Figure 9 This is a schematic diagram of the secondary separation state of the piston blank according to the present invention.

[0039] In the diagram: 1. Lower mold; 2. Left mold; 3. Right mold; 4. Upper mold; 41. Reference forming groove; 411. Upper groove; 412. Lower groove; 42. Fixed mold; 43. Moving mold; 5. Cooling cone; 51. Coolant; 52. Inlet pipe; 53. Outlet pipe; 6. Piston blank; 61. Positioning platform. Detailed Implementation

[0040] 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.

[0041] Please see Figures 1 to 9 This invention provides a lightweight automatic aluminum piston casting machine, the technical solution of which is as follows:

[0042] Reference Figures 1 to 6 A lightweight aluminum piston automatic casting machine is disclosed for casting piston blanks 6 with positioning platforms 61. The machine includes a lower mold 1, a left mold 2, a right mold 3, an upper mold 4, and a cooling cone 5. During operation, the lower mold 1 is fixed on a platform. The left mold 2 slides left and right on the left side of the lower mold 1 under the push and pull of a cylinder, and the right mold 3 slides left and right on the right side of the lower mold 1 under the push and pull of a cylinder. When the left mold 2 slides to its right limit position, its internal groove is tightly against the flange of the lower mold 1. When the right mold 3 slides to its left limit position, its internal groove is tightly against the flange of the lower mold 1. When the grooves of both the left and right molds are in contact with the flange of the lower mold 1, the left mold 2, right mold 3, and lower mold 1 together form a cavity with an open top and sealed parts. The upper part of the lower mold 1 has irregular protrusions, which represent the internal shape of the piston blank 6 and can be changed according to actual needs. Then, molten metal is poured into the cavity through the opening at the top. To ensure consistency in the casting of piston blanks 6 in the same batch, the total amount of molten metal poured in each time should be consistent. Specifically, a robotic arm can be used to hold a crucible with a set capacity, and then a fixed amount of molten metal can be scooped from the molten pool and poured into the mold cavity. After that, the cylinder pushes the upper mold 4 down to between the left mold 2 and the right mold 3. The upper mold 4 is equipped with a reference forming groove 41 inside, which runs through the upper mold 4 and is coaxial with the upper mold 4. The upper mold 4 moves down to a rated height to give the molten metal in the cavity a rated pressure, thereby making the structure of the formed piston blank 6 more compact and stronger. The cooling cone 5 is located above the upper mold 4. In the above scheme, the PLC controller controls the action sequence and stroke of the three cylinders (i.e., the left mold 2 cylinder, the right mold 3 cylinder and the upper mold 4 cylinder) according to a preset program to realize the automatic opening and closing of the mold and die casting in the automatic casting machine.

[0043] The left mold 2 moves to the right and the right mold 3 moves to the left to form a cavity for containing molten metal. The upper mold 4 moves down to compress the molten metal in the cavity and form the forming space for the piston blank 6. The reference forming groove 41 contains the molten metal that is pressed upward and serves as a channel for the bubbles to rise and be discharged. The cooling cone 5 contacts the hot air rising along the reference forming groove 41 to accelerate the cooling of the piston blank 6.

[0044] As one embodiment of the present invention, refer to Figure 5The reference forming groove 41 includes an upper groove 411 and a lower groove 412 from top to bottom. The cross-sectional area of ​​the upper groove 411 is smaller than that of the lower groove 412.

[0045] When the upper mold 4 is pressed down by the cylinder, the outer periphery of the upper mold 4 is sealed with the left mold 2 and the right mold 3 through the sealing ring to prevent the molten metal from flowing out from the gap between the upper mold 4 and the left mold 2 or the right mold 3. During the pressing down of the upper mold 4, the lower end face of the upper mold 4 comes into contact with the molten metal first. Then, as the upper mold 4 continues to press down, the molten metal enters the lower groove 412 and then enters the upper groove 411. As the liquid level of the molten metal in the upper groove 411 continues to rise, it means that the pressure of the molten metal in the cavity below the upper mold 4 gradually increases. Through this principle, it can also be used to verify whether the amount of molten metal poured into the cavity each time is equal: when casting the same batch of piston blanks 6, the height of the upper mold 4 is consistent. That is, under the premise of pouring in the same amount of molten metal, the liquid level in the upper groove 411 should also be consistent. Therefore, by comparing the formed piston blanks 6, if the length of the structure formed by casting in the upper groove 411 is inconsistent, it means that the total amount of molten metal poured in is different.

[0046] The cross-sectional area of ​​the upper tank 411 should be as small as possible. On the one hand, the smaller the cross-sectional area of ​​the upper tank 411, the smaller the volume, which reduces the total amount of metal recovered. On the other hand, the smaller the cross-sectional area of ​​the upper tank 411, the higher the liquid level will be when the same amount of molten metal is poured into the upper tank 411, which will result in greater hydraulic pressure of the molten metal in the cavity below the upper mold 4, thus increasing the structural strength of the effective part of the piston blank 6. In the attached drawings of this scheme, the upper tank 411 structure has been enlarged to show it more clearly.

[0047] As one embodiment of the present invention, refer to Figure 4 and Figure 6 The upper mold 4 consists of a fixed mold 42 and a moving mold 43 from top to bottom. The moving mold 43 uses its own slider structure to cooperate with the slide rail structure of the fixed mold 42 and slides on the fixed mold 42. During installation, the slider below the moving mold 43 is inserted into the slide rail from the outer edge of the fixed mold 42. When the moving mold 43 moves inward, it will contact the end surface of the slide rail to reach the limit position. When both moving molds 43 are in the limit position, they fit together. At this time, bolts are inserted into the through holes of the boss of the moving mold 43 to fasten the two moving molds 43. The position of the moving mold 43 is then bound to the fixed mold 42 and no longer slips. By removing and installing the bolts, the two moving molds 43 are detachably connected. The upper groove 411 is located inside the moving mold 43, and the lower groove 412 is located inside the fixed mold 42.

[0048] Normally, the two moving dies 43 are fitted together, and bolts are used to fasten the two moving dies 43 by passing through the through holes on the protrusions of the moving dies 43. At this time, the upper groove 411 inside the moving die 43 and the lower groove 412 inside the fixed die 42 are continuous cavities. When the upper die 4 is pressed down, the molten metal enters the lower groove 412 and the upper groove 411 in sequence. After the piston blank 6 is cooled and formed, the upper die 4 moves up, and the upper die 4 forms a structure that separates from the positioning table 61 and the upper groove 411 in sequence. As can be seen from the above analysis, the cross-sectional area of ​​the upper groove 411 should be as small as possible. The better, but the smaller the cross-sectional area, the easier it is to break and get stuck inside the upper groove 411. Therefore, when the upper mold 4 gets stuck during the rising process (this phenomenon is manifested as high resistance to the rising of the upper mold 4 when the left mold 2 and the right mold 3 are not separated, or the piston blank 6 is lifted together when the upper mold 4 rises after the left mold 2 and the right mold 3 are opened), the bolts that fasten the moving mold 43 are removed to separate the two moving molds 43, thereby removing the broken structure stuck inside the upper groove 411 and restoring the normal operation of the automatic casting machine.

[0049] As one embodiment of the present invention, refer to Figure 5 and Figure 8 The upper groove 411 is set as a frustum-shaped structure, and the major diameter of the upper groove 411 is at the bottom. The major diameter of the upper groove 411 is smaller than the minor diameter of the lower groove 412, and the height of the upper groove 411 is greater than the height of the lower groove 412.

[0050] The structure formed by the upper groove 411 should be a slender rod shape. Firstly, the thinner the rod, the less molten metal it occupies, thus improving the direct utilization rate of the molten metal. A thinner rod also means the structure is easier to remove from the positioning table 61. A longer rod means greater pressure on the molten metal in the cavity below the upper mold 4, resulting in a better quality piston blank 6. It also means a better "chimney effect" from the upper groove 411. Therefore, to obtain a slender rod-shaped structure, the diameter of the upper groove 411 should be as small as possible, and its height should be as long as possible. In this method, the diameter of the cast piston blank 6 is 42mm, and its height (excluding the positioning table 61 and the structure above it) is 52mm. The major diameter of the upper groove 411 is 2mm, the minor diameter is 1mm, and the height is 20mm. (Refer to...) Figure 8 After the cast piston blank 6 is removed (usually using a clamping and material handling mechanism) and completely cooled, the structure formed by the upper groove 411 of the boss is removed using a lathe or shearing machine, and the removed structure is sent back to the molten pool for recycling. Then, a positioning groove is machined on the positioning table 61 to cooperate with the nail tip of the lathe in subsequent processing.

[0051] As one embodiment of the present invention, refer to Figure 5 and Figure 9 The lower groove 412 is configured as a frustum-shaped structure, with the minor diameter of the lower groove 412 at the top;

[0052] The fixed mold 42 is made of cast iron, and a section is machined off from a cylindrical blank to form the fixed mold 42 blank. The machining process mainly revolves around three aspects. First, a section of the fixed mold 42 blank is reduced in diameter using a lathe to obtain the upper boss of the fixed mold 42. Then, the lower groove 412 is machined. First, a through hole with a diameter equal to the minor diameter of the lower groove 412 is drilled using a drilling machine, and then a tapered reamer is used to enlarge the hole to obtain the complete lower groove 412. Finally, a milling machine is used to machine the slide rail on the fixed mold 42 that mates with the moving mold 43. The main function of the positioning table 61 is to replace the piston end face and mate with the rivet tip on the lathe. After the piston blank 6 is machined, the positioning table 61 is removed using a lathe (see reference). Figure 9 ).

[0053] As one embodiment of the present invention, refer to Figure 6 and Figure 7 The cooling cone 5 has through holes in the vertical direction to slide on the support of the fixed mold 42. Nuts are installed above and below the through holes to position the height of the cooling cone 5. The cooling cone 5 is set as an inverted cone structure and is coaxial with the lower groove 412.

[0054] As one embodiment of the present invention, refer to Figure 7 The cooling cone 5 is hollow inside and filled with coolant 51. Through holes are opened on the side wall of the cooling cone 5 to insert inlet pipe 52 and outlet pipe 53. Compared with outlet pipe 53, inlet pipe is inserted deeper so that coolant 51 is located at the tip of the cone when it enters the cooling cone 5, so that the temperature at the outlet of the upper tank 411 is lower, thereby promoting the "chimney effect" formed in the upper tank 411, accelerating the discharge of hot gas in the molten metal, and increasing the heat exchange rate between the molten metal and the outside world, so that the piston blank 6 can be formed faster.

[0055] Working Principle: To address the issue of defects such as porosity and burrs in the finished product caused by the inability of gas to escape from the mold cavity during the casting process of piston blank 6, and to improve the density and cooling efficiency of the casting, a through-type reference forming groove 41 is created inside the upper mold 4 as a venting and pressurizing channel, with a cooling cone 5 positioned directly above it. During casting, the gas in the mold cavity is discharged through the reference forming groove 41, thus releasing the gas; simultaneously, the cooling cone 5 rapidly cools the discharged high-temperature gas, thereby accelerating the cooling and forming speed of the entire piston blank 6, achieving a simultaneous improvement in casting quality and production efficiency.

[0056] To optimize piston structural strength while ensuring ease of subsequent finishing, the reference forming groove 41 is designed as a two-stage structure consisting of a lower groove 412 and an upper groove 411. The lower groove 412 is used to additionally cast a temporary positioning platform 61 on top of the piston blank 6. This positioning platform 61 is specifically used for centering and fixing during subsequent lathe machining. After machining, it can be machined off and recycled, thus avoiding the need to machine a permanent positioning groove on the piston body, which would weaken its structure. The upper groove 411, which has a smaller cross-sectional area and is connected above the lower groove 412, plays a crucial role in throttling and pressurizing. When molten metal is pressed into the reference forming groove 41, the narrow channel of the upper groove 411 significantly increases the molten metal pressure in the main cavity below, resulting in a denser structure and superior mechanical properties in the final formed piston.

[0057] To further enhance exhaust and cooling effects and ensure long-term stable operation of the equipment, the structure of the upper groove 411, the configuration of the cooling cone 5, and the demolding mechanism of the upper mold 4 were designed collaboratively. First, the upper groove 411 is designed as a slender rod, and its height creates a "chimney effect" that enhances the efficiency of hot gas convection exhaust. Second, the cooling cone 5 is filled with circulating coolant 51, which efficiently and forcibly cools the high-temperature gas exhausting from the upper groove 411, significantly shortening the casting cycle. However, this rapid cooling may also cause the slender metal rod solidified in the upper groove 411 to become brittle and break during demolding. To address this potential problem, the invention designs the upper mold 4 as a combination of a fixed mold 42 and a detachable moving mold 43, with the upper groove 411 located inside the moving mold 43. In the event of metal rod breakage and jamming, the broken part can be easily removed by separating the two moving molds 43, avoiding prolonged downtime for maintenance and ensuring the continuity and reliability of the entire automated casting system.

[0058] 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 lightweight aluminum piston automatic casting machine for casting piston blanks (6) with a positioning platform (61), comprising a lower mold (1), a left mold (2), and a right mold (3), wherein the left mold (2) slides on the left side of the lower mold (1), and the right mold (3) slides on the right side of the lower mold (1), and the right mold (3) wraps around the lower mold (1) when it is in contact with the left mold (2), characterized in that: It also includes an upper mold (4) and a cooling cone (5). The upper mold (4) is inserted between the left mold (2) and the right mold (3), and the upper mold (4) has a reference forming groove (41) inside. The reference forming groove (41) passes through the upper mold (4) and is coaxial with the upper mold (4). The cooling cone (5) is located above the upper mold (4). The left mold (2) moves to the right and the right mold (3) moves to the left to form a cavity for containing molten metal. The upper mold (4) moves down to compress the molten metal in the cavity and form the forming space for the piston blank (6). The reference forming groove (41) contains the molten metal that is pressed upward and serves as a channel for the rising and discharge of air bubbles. The cooling cone (5) contacts the hot air rising along the reference forming groove (41) to accelerate the cooling of the piston blank (6). The reference forming groove (41) includes an upper groove (411) and a lower groove (412) from top to bottom, and the cross-sectional area of ​​the upper groove (411) is smaller than the cross-sectional area of ​​the lower groove (412). The lower groove (412) is configured as a frustum-shaped structure, with the minor diameter of the lower groove (412) at the top; The upper groove (411) is configured as a frustum-shaped structure, with the major diameter of the upper groove (411) at the bottom. The major diameter of the upper groove (411) is smaller than the minor diameter of the lower groove (412), and the height of the upper groove (411) is greater than the height of the lower groove (412).

2. The lightweight aluminum piston automatic casting machine according to claim 1, characterized in that: The upper mold (4) includes a fixed mold (42) and a moving mold (43) from top to bottom. The moving mold (43) is slidably connected to the fixed mold (42), and the two moving molds (43) are detachably connected. The upper groove (411) is located inside the moving mold (43), and the lower groove (412) is located inside the fixed mold (42).

3. The lightweight aluminum piston automatic casting machine according to claim 2, characterized in that: The cooling cone (5) is mounted on the fixed mold (42), and the cooling cone (5) is configured as an inverted cone structure, and the cooling cone (5) is coaxial with the lower groove (412).

4. The lightweight aluminum piston automatic casting machine according to claim 3, characterized in that: The cooling cone (5) is hollow inside and filled with coolant (51).

5. The lightweight aluminum piston automatic casting machine according to claim 4, characterized in that: The cooling cone (5) is provided with an inlet pipe (52) and an outlet pipe (53), with the outlet of the inlet pipe (52) located below the inlet of the outlet pipe (53).

6. The lightweight aluminum piston automatic casting machine according to claim 3, characterized in that: The cooling cone (5) is slidably connected to the fixed mold (42).

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