Extrusion casting forming device and forming method thereof

Abstract

The extrusion casting forming device comprises an upper die, a lower die, an injection system and a sealing assembly, the upper die moves downwards to be combined with the lower die to form a cavity matched with a casting in shape, and a flow gate communicated with the cavity and the injection system is installed on the upper die or the lower die. And after the injection system injects metal melt into the cavity through the flow gate for mold filling, the mold sealing assembly seals the cavity at the flow gate and separates a casting and a material handle of the casting. The mold has the advantages of small pressure loss, good molding effect and convenience in casting demolding.

Description

Technical Field

[0001] The present invention relates to the field of molding technology, and in particular to an extrusion casting molding device and a molding method thereof. Background Art

[0002] Squeeze casting, also known as liquid die forging, is a process method that applies high mechanical pressure to the metal melt entering the casting cavity to form and solidify it, thereby obtaining a casting. The casting has a dense structure, fine grains, and mechanical properties close to those of forgings and higher than other ordinary castings. In recent years, with the continuous improvement of the analysis and control methods of the forming process, squeeze casting has become increasingly mature.

[0003] Squeeze casting is divided into direct squeeze casting and indirect squeeze casting. Indirect squeeze casting has been rapidly developed and applied due to its better process adaptability. The squeeze casting machine mainly includes: fixed mold, movable mold, injection system, hydraulic and control system, etc. The movable mold moves longitudinally (or transversely) under the push of the working cylinder to form a cavity with the fixed mold, and then locks the movable mold. The power cylinder of the injection system pushes the injection assembly to inject the molten metal into the cavity and pressurize it to form it. After forming, the fixed mold and the movable mold are separated to take out the casting and the handle; during forming, the molten metal is poured into the barrel of the injection system, and then enters the cavity through the ingates and forms a handle in the barrel. At this time, the mechanical pressure first acts on the thick handle and then is transmitted to the casting. The pressure loss is large, resulting in uneven casting performance. In addition, after forming, the handle and the casting need to be demolded as a whole, which is difficult to demold. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an extrusion casting molding device with small pressure loss, good molding effect and convenient demoulding of castings.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An extrusion casting molding device includes an upper mold, a lower mold, an injection system and a sealing component. The upper mold moves downward and closes the lower mold to form a cavity that matches the shape of the casting. The upper mold or the lower mold is equipped with an inner gate that connects the cavity and the injection system. After the injection system injects molten metal into the cavity through the inner gate to fill the mold, the sealing component seals the cavity at the inner gate and isolates the casting and its handle.

[0007] As a further improvement of the above technical solution:

[0008] The inner gate is arranged on the lower mold, and the inner gate is arranged to have a tapered structure with a large diameter facing the mold cavity on the side close to the mold cavity. The injection system is located below the lower mold.

[0009] The injection system includes a lifting mechanism one, a barrel, a lifting mechanism two and a filling component. The barrel is fixedly mounted on the lifting mechanism one and can abut against the bottom of the lower mold under the drive of the lifting mechanism one. The lifting mechanism two is fixedly mounted on the lifting mechanism one. The filling component is fixedly mounted on the lifting mechanism two and slides with the inner wall of the barrel. Under the drive of the lifting mechanism two, the filling component injects the molten metal into the mold cavity through the inner gate.

[0010] The filling assembly includes a pushing rod, a tray, a filling disk and a spring. The pushing rod is fixed on the second lifting mechanism, the tray is sleeved on the pushing rod, the filling disk is embedded in the top of the tray and slides with the inner wall of the barrel, and the spring is sleeved on the pushing rod and abuts between the second lifting mechanism and the tray.

[0011] A plurality of guide rings tightly attached to the inner wall of the barrel are installed on the tray.

[0012] The top of the filling plate is provided with a plurality of protrusions, and the protrusions are in contact with the lower mold under the drive of the second lifting mechanism.

[0013] The bottom of the lower mold is provided with annular grooves on both sides of the inner gate, and the protrusions abut against the annular grooves.

[0014] The mold sealing component is fixed on the top of the ejection rod and can be inserted into the gate through the filling plate under the drive of the second lifting mechanism.

[0015] The sealing component includes a center punch, which is fixed on the lifting mechanism 2 and embedded in the gate under the drive of the lifting mechanism 2. A guide piece is provided in the center punch for quickly cooling the metal melt around the center punch.

[0016] It also includes an extrusion casting punch, which, together with the upper die and the lower die, forms a cavity that matches the shape of the casting.

[0017] The mold sealing component, the upper mold and the lower mold together enclose a mold cavity that matches the shape of the casting. The mold sealing component is installed on the upper mold and embedded in the gate after filling.

[0018] The sealing assembly includes a center punch and a lifting mechanism three. The center punch is fixed on the lifting mechanism three and is embedded in the gate under the drive of the lifting mechanism three. A guide piece is provided in the center punch for quickly cooling the metal melt around the center punch.

[0019] An easily deformable external part is arranged between the upper die and the lower die.

[0020] The injection system includes a heat preservation furnace and a liquid riser. The heat preservation furnace is provided with a gas interface. The liquid riser passes through the heat preservation furnace and is connected to the inner gate.

[0021] The sealing component is configured as a cooling pipe, and the cooling pipe is wrapped around the inner gate.

[0022] It also includes an extrusion casting punch, which, together with the upper die and the lower die, forms a cavity that matches the shape of the casting.

[0023] The inner gate is arranged on the upper mold, and the inner gate is arranged to have a large-caliber tapered structure facing the injection system on the side close to the injection system. The injection system is located above the upper mold.

[0024] The inner gate, the upper mold and the lower mold together enclose a cavity that matches the shape of the casting. The mold sealing component is installed on the lower mold and is embedded in the inner gate after filling.

[0025] The injection system includes a heat preservation furnace and a movable crossbeam. The heat preservation furnace is fixed on the movable crossbeam, and the movable crossbeam can move up and down relative to the upper mold. A gas interface is provided on the heat preservation furnace, and a valve seat matching the inner gate is provided at the bottom of the heat preservation furnace, and a valve is embedded in the valve seat.

[0026] The sealing component includes a center punch and a lifting mechanism four. The center punch is fixed on the lifting mechanism four. Before filling the mold, the center punch moves upward along the inner gate and pushes open the valve under the drive of the lifting mechanism four; during filling the mold, the center punch moves downward along the inner gate under the drive of the lifting mechanism four to guide the metal molten downward for filling the mold; after filling the mold, the center punch moves upward along the inner gate under the drive of the lifting mechanism four and is embedded in the inner gate. A guide piece is provided in the center punch for quickly cooling the metal melt around the center punch.

[0027] The valve is provided with a spring piece for supporting the valve on the valve seat after the valve is pushed out.

[0028] A stirrer is also provided in the insulation furnace.

[0029] A molding method based on the squeeze casting molding device according to any one of claims 1 to 21, comprising the following steps:

[0030] S1: Preheat the upper mold, lower mold, injection system and sealing components;

[0031] S2: The upper mold moves downward and closes with the lower mold to form a cavity;

[0032] S3: Pour the molten metal into the injection system, and the injection system injects the molten metal into the mold cavity through the ingate to fill the mold;

[0033] S4: After filling, the sealing piece closes the cavity and separates the casting from the material handle;

[0034] S5: Continuous pressure is applied to strongly feed the casting;

[0035] S6: The upper die moves upwards and the casting and the handle are taken out.

[0036] Compared with the prior art, the advantages of the present invention are:

[0037] During molding, the extrusion casting device of the present invention moves downward to mate with the lower mold to form a mold cavity. Molten metal is injected into the barrel of the injection system and, under pressure, enters the mold cavity through the ingate, forcing it to fill. After filling, the mold sealing assembly seals the mold cavity at the ingate, separating the casting from the shank. Continuous pressure is then applied to provide strong shrinkage compensation and maintain pressure on the casting. Compared to conventional molding devices, the extrusion casting device of the present invention uses a mold sealing assembly to seal the mold cavity at the ingate. The mechanical pressure during molding directly acts on the casting within the mold cavity. This continuous pressure produces a casting with a dense structure and excellent mechanical properties. Furthermore, the mold sealing assembly separates the casting from the shank during molding, facilitating demolding of the casting after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the structure of Example 1 of the present invention (before molding).

[0039] Figure 2 It is a structural schematic diagram of Example 1 of the present invention (in the process of forming).

[0040] Figure 3 It is a schematic diagram of the ingate structure of Example 1 of the present invention.

[0041] Figure 4 It is a schematic diagram of the filling component structure of Example 1 of the present invention.

[0042] Figure 5 It is a schematic structural diagram of the sealing component of Example 1 of the present invention.

[0043] Figure 6 Schematic diagram of the casting structure of Example 1 of the present invention.

[0044] Figure 7 Schematic diagram of the structure of Example 2 of the present invention (before molding).

[0045] Figure 8 It is a structural schematic diagram of Example 2 of the present invention (in the process of forming).

[0046] Figure 9 Schematic diagram of the casting structure of Example 2 of the present invention.

[0047] Figure 10 Schematic diagram of the structure of Example 3 of the present invention (before molding).

[0048] Figure 11 Schematic diagram of the structure of Example 3 of the present invention (in the process of forming).

[0049] Figure 12 This is a schematic diagram of the installation of the sealing component of Example 3 of the present invention.

[0050] Figure 13 Schematic diagram of the structure of Example 4 of the present invention (before molding).

[0051] Figure 14 This is a schematic diagram of the top-opening valve in Example 4 of the present invention.

[0052] Figure 15 It is a structural schematic diagram of Example 4 of the present invention (in the process of forming).

[0053] Figure 16 It is a schematic diagram of the ingate structure of Example 4 of the present invention.

[0054] Figure 17 This is a schematic diagram of the valve structure of Example 4 of the present invention.

[0055] Figure 18 It is a schematic diagram of the valve seat structure of Example 4 of the present invention.

[0056] Figure 19 Schematic diagram of the casting structure of Example 4 of the present invention.

[0057] The numbers in the figure represent:

[0058] 1. Upper die; 2. Lower die; 21. Annular groove; 3. Injection system; 31. Lifting mechanism 1; 32. Barrel; 33. Filling assembly; 331. Ejection rod; 332. Tray; 3321. Guide ring; 333. Filling plate; 3331. Protrusion; 334. Spring; 34. Lifting mechanism 2; 35. Holding furnace; 351. Gas interface; 352. Valve seat; 353. Valve; 3531. Shrapnel; 354. Agitator; 36. Lifting pipe; 37. Movable crossbeam; 4. Cavity; 5. Ingate; 6. Sealing assembly; 61. Center punch; 62. Guide piece; 63. Lifting mechanism 3; 64. Cooling pipe; 65. Lifting mechanism 4; 7. Extrusion punch; 8. External component; 100. Casting; 101. Material handle. DETAILED DESCRIPTION

[0059] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] Example 1:

[0061] like Figures 1 to 6As shown, the first embodiment of the extrusion casting molding device of the present invention is a piston molding device, including an upper mold 1, a lower mold 2, an injection system 3 and a sealing component 5. The upper mold 1 moves downward and closes the lower mold 2 to form a cavity 4 that matches the shape of the casting 100. The lower mold 2 is equipped with an inner gate 5 that connects the cavity 4 and the injection system 3. After the injection system 3 injects the metal melt into the cavity 4 through the inner gate 5 to fill the mold, the sealing component 6 closes the cavity 4 at the inner gate 5 and isolates the casting 100 and its material handle 101. During molding, the upper mold 1 moves downward and closes with the lower mold 2 to form a mold cavity 4, and molten metal is injected into the injection system 3. Then, the injection system 3 injects the molten metal into the mold cavity 4 through the inner gate 5 to fill the mold. After filling, the sealing component 6 closes the mold cavity 4 at the inner gate 5, separating the casting 100 from the material handle 101. After continuous pressure is applied to the casting 100 for strong shrinkage compensation, the pressure is maintained. Compared with traditional molding devices, the extrusion casting molding device of the present invention closes the mold cavity 4 at the inner gate 5 by providing a sealing component 6. The mechanical pressure during molding directly acts on the casting 100 in the mold cavity 4. By continuously applying pressure, a casting 100 with dense structure and good mechanical properties can be obtained. During molding, the sealing component 6 separates the casting 100 from the material handle 101, which facilitates the demolding of the casting 100 after molding.

[0062] In this embodiment, the side of the ingate 5 near the cavity 4 is configured as a tapered structure with a larger diameter toward the cavity 4, and the injection system 3 is located below the lower mold 2. In this structure, the ingate 5 is an integrated structure, which simplifies the mold structure and reduces manufacturing costs. The tapered structure of the ingate 5 on the side of the cavity 4 facilitates rapid closure of the ingate 5 to seal the cavity 4 and also facilitates demolding of the casting 100 and the handle 101.

[0063] In this embodiment, the injection system 3 includes a lifting mechanism 1 31, a barrel 32, a lifting mechanism 2 34, and a filling assembly 33. The barrel 32 is fixedly mounted on the lifting mechanism 1 31 and can abut against the bottom of the lower mold 2 under the drive of the lifting mechanism 1 31. The lifting mechanism 2 34 is fixedly mounted on the lifting mechanism 1 31. The filling assembly 33 is fixedly mounted on the lifting mechanism 2 34 and slides against the inner wall of the barrel 32. The filling assembly 33, driven by the lifting mechanism 2 34, injects the molten metal into the mold cavity 4 through the ingate 5. In this structure, the lifting mechanism 1 31 drives the barrel 32 up and down to facilitate loading. After the barrel 32 abuts against the lower mold 2, the lifting mechanism 2 34 drives the filling assembly 33 to inject the molten metal into the mold cavity 4.

[0064] In this embodiment, the filling assembly 33 includes a push rod 331, a tray 332, a filling plate 333, and a spring 334. The push rod 331 is fixed to the second lifting mechanism 34, the tray 332 is mounted on the push rod 331, the filling plate 333 is embedded in the top of the tray 332 and slides with the inner wall of the barrel 32, and the spring 334 is mounted on the push rod 331 and abuts between the second lifting mechanism 34 and the tray 332. The structure is simple and stable.

[0065] In this embodiment, the tray 332 is mounted with a plurality of guide rings 3321 that are in close contact with the inner wall of the barrel 32. In this structure, the guide rings 3321 prevent the filling plate 333 from coming into direct contact with the barrel 32 during its upward and downward movement, thereby providing protection. Furthermore, the guide rings 3321 guide the center punch 61 of the sealing assembly 6 that passes through the central through-hole of the filling plate 333, ensuring that the center punch 61 accurately enters the ingates 5.

[0066] In this embodiment, the top of the filling plate 333 is provided with a plurality of protrusions 3331, which abut against the lower die 2 under the drive of the second lifting mechanism 34. In this structure, the protrusions 3331 are provided to abut against the lower die 2 to limit the flow rate of the molten metal during filling. At the same time, it prevents the filling plate 333 from further compressing the material handle 101, preventing the center punch 61 of the sealing assembly 6 from being locked, and facilitates the separation of the center punch 61 from the material handle 101.

[0067] In this embodiment, annular grooves 21 are provided on the bottom of the lower mold 2 on both sides of the ingate 5, and the protrusions 3331 abut against the annular grooves 21. In this structure, the annular grooves 21 are provided on the bottom of the lower mold 2. During the injection molding process, oxide impurities in the molten metal gather upward on the surface and are intercepted and contained by the annular grooves 21, thereby reducing the entry of oxide impurities into the mold cavity 4 and reducing the risk of slag inclusion in the casting 100.

[0068] In this embodiment, the mold sealing assembly 6 is fixed to the top of the ejection rod 331 and can be inserted into the ingode 5 through the filling plate 333 under the drive of the second lifting mechanism 34. In this structure, the mold sealing assembly 6 is fixed to the top of the ejection rod 331. When the second lifting mechanism 34 drives the raised portion 3331 on the top of the filling plate 333 to abut against the lower mold 2, the spring 334 is compressed, and the ejection rod 331 drives the mold sealing assembly 6 to separate from the filling plate 333 and continue to move upward into the ingode 5, thereby separating the casting 100 from the material handle 101.

[0069] In this embodiment, the mold sealing assembly 6 includes a center punch 61, which is fixed to the second lifting mechanism 34 and is inserted into the ingates 5 under the drive of the second lifting mechanism 34. A flow guide 62 is provided in the center punch 61 for rapidly cooling the molten metal around the center punch 61. In this structure, the center punch 61 is inserted into the ingates 5, and the casting 100 is further filled under the pressure generated by the center punch 61. The coolant cools the molten metal around the center punch 61 through the flow guide 62, quickly sealing the ingates 5 and preventing the molten metal from penetrating into the gap between the center punch 61 and the ingates 5.

[0070] This embodiment also includes an extrusion casting punch 7, which, together with the upper die 1 and the lower die 2, encloses a mold cavity 4 that matches the shape of the casting 100. In this structure, the extrusion casting punch 7 continuously applies mechanical pressure to the casting 100 after filling the mold. Under the action of pressure, the casting 100 further fills the mold, undergoes shrinkage crystallization, maintains pressure, and undergoes slight plastic deformation, thereby ensuring molding quality.

[0071] The molding method of the extrusion casting molding device of this embodiment includes the following steps:

[0072] S1: Preheating the upper mold 1, lower mold 2, injection system 3 and sealing component 6;

[0073] S2: The upper mold 1 moves downward and closes with the lower mold 2 to form the cavity 4;

[0074] S3: pouring the molten metal into the injection system 3, which injects the molten metal into the mold cavity 4 through the ingate 5 to fill the mold;

[0075] S4: After filling, the sealing member 6 closes the mold cavity 4 and separates the casting 100 from the material handle 101;

[0076] S5: Continuously applying pressure to strongly feed the casting 100;

[0077] S6: The upper die 1 moves upward to take out the casting 100 and the handle 101.

[0078] In this method, after the metal melt enters the mold cavity 4 to fill the mold, the sealing component 6 is used to close the inner gate 5, thereby isolating the casting 100 from the material handle 101, so that the mechanical pressure acts directly on the casting 100, with small pressure loss, high molding quality, and easy demoulding of the casting 100.

[0079] Example 2:

[0080] like Figures 7 to 9 As shown, the second embodiment of the squeeze casting molding device of the present invention is a molding device for high-performance wheel spacers, which is basically the same as the embodiment 1, except that:

[0081] In this embodiment, the mold sealing assembly 6, along with the upper mold 1 and lower mold 2, encloses a mold cavity 4 that matches the shape of the casting 100. The mold sealing assembly 6 is installed on the upper mold 1 and is embedded in the ingate 5 after the mold is filled. In this structure, the mold sealing assembly 6 not only helps to enclose and form the mold cavity 4, but also embeds into the ingate 5 after the mold is filled to seal the ingate 5 and further fill the casting 100.

[0082] In this embodiment, the mold sealing assembly 6 includes a center punch 61 and a third lifting mechanism 63. The center punch 61 is fixed to the third lifting mechanism 63 and is inserted into the ingate 5 under the drive of the third lifting mechanism 63. The center punch 61 is provided with a flow guide 62 for rapidly cooling the molten metal around the center punch 61. In this structure, the center punch 61 is inserted into the ingate 5, and the casting 100 is further filled under the pressure generated by the center punch 61. The coolant passes through the flow guide 62 to cool the molten metal around the center punch 61, quickly sealing the ingate 5 and preventing the molten metal from penetrating into the gap between the center punch 61 and the ingate 5.

[0083] In this embodiment, a deformable external member 8 is disposed between the upper mold 1 and the lower mold 2. In this structure, an annular groove is provided between the upper mold 1 and the lower mold 2, and the annular external member 8, which has a circular cross-section, is installed in the groove. The external member 8 is easily deformed under pressure, thereby reducing the longitudinal height and volume of the mold cavity, ensuring structural space for the casting 100 to deform under pressure.

[0084] Example 3:

[0085] like Figures 10 to 12 As shown, the third embodiment of the squeeze casting molding device of the present invention is basically the same as the first embodiment, except that:

[0086] In this embodiment, the injection system 3 includes a holding furnace 35 and a riser pipe 36. The holding furnace 35 is provided with a gas interface 351. The riser pipe 36 is installed on the holding furnace 35 and is connected to the ingode 5. In this structure, high-pressure gas enters the holding furnace 35 through the gas interface 351 and injects the molten metal in the holding furnace 35 through the riser pipe 36 into the mold cavity 4. Under the action of the gas pressure, the molten metal enters the mold cavity 4 in the reverse direction (against gravity) along the riser pipe 36 and the ingode 5. The pressure during filling is adjustable, smooth and splash-free, ensuring the quality of the casting 100 and good process adaptability.

[0087] In this embodiment, the mold sealing component 6 is configured as a cooling tube 64, which wraps around the ingates 5. In this structure, after the molten metal enters the mold cavity 4 and fills the mold, the cooling tube 64 rapidly cools the molten metal within the ingates 5. The molten metal solidifies within the ingates 5 on the side of the mold cavity 4, forming a conical sealing structure that quickly seals the ingates 5. The holding furnace 35 is then depressurized, and the remaining molten metal flows back into the holding furnace 35 under the action of gravity.

[0088] In this embodiment, a horizontal electromagnetic stirrer may be further provided at the bottom of the holding furnace 35 to stir the molten metal, thereby enhancing the uniformity of the molten metal and improving the molding quality of the casting 100 .

[0089] Example 4:

[0090] like Figures 13 to 19 As shown, the fourth embodiment of the squeeze casting molding device of the present invention is a molding device for a brake disc. The metal melt is a ceramic particle reinforced aluminum alloy with poor fluidity. The fourth embodiment is basically the same as the first embodiment, except that:

[0091] In this embodiment, the ingate 5 is provided on the upper mold 1. The side of the ingate 5 near the injection system 3 is configured as a tapered structure with a large diameter facing the injection system 3. The injection system 3 is located above the upper mold 2. In this structure, the ingate 5 is an integrated structure, which simplifies the mold structure and reduces manufacturing costs. The ingate 5 is designed as a tapered structure on the side of the injection system 3 to facilitate demolding of the casting 100 and the handle 101.

[0092] In this embodiment, the ingates 5, the upper mold 1 and the lower mold 2 together enclose a cavity 4 that matches the shape of the casting 100. The mold sealing component 6 is provided on the lower mold 2 and is embedded in the ingates 5 after filling.

[0093] In this embodiment, the injection system 3 includes a holding furnace 35 and a movable crossbeam 37. The holding furnace 35 is fixedly mounted on the movable crossbeam 37, which can move up and down relative to the upper mold 1. The holding furnace 35 is provided with a gas interface 351. The bottom of the holding furnace 35 is provided with a valve seat 352 that matches the ingates 5. The valve seat 352 has a valve 353 embedded therein. In this structure, the molten metal flows out from the bottom of the holding furnace 35, and the oxide impurities in the molten metal are concentrated upward, reducing the risk of slag inclusion in the casting 100 during molding.

[0094] In this embodiment, the sealing component 6 includes a center punch 61 and a lifting mechanism 65. The center punch 61 is fixed on the lifting mechanism 65. Before filling, the center punch 61 moves upward along the inner gate 5 and pushes open the valve 353 under the drive of the lifting mechanism 65. During filling, the center punch 61 moves downward along the inner gate 5 under the drive of the lifting mechanism 65 to guide the metal molten downward for filling. After filling, the center punch 61 moves upward along the inner gate 5 under the drive of the lifting mechanism 65 and is embedded in the inner gate 5. A guide member 62 is provided in the center punch 61 for quickly cooling the metal melt around the center punch 61. In this structure, the center punch 61 can push open the valve 353 under the drive of the lifting mechanism 4 65, so that the metal melt in the insulation furnace 35 flows downward along the valve seat 352 under the action of gas pressure and gravity. The center punch 61 guides the metal melt to slowly descend, reduces the flow speed of the metal melt, eliminates the liquid splashing when the metal melt impacts the cavity 4, and ensures the molding quality of the casting. After filling, the center punch 61 moves up again and is embedded in the inner gate 5 to further shape the casting 100, and the metal melt around the center punch 61 is quickly cooled and solidified by the guide member 62 to close the inner gate 5.

[0095] In this embodiment, the valve 353 is provided with a spring 3531 for supporting the valve seat 352 after the valve 353 is ejected. In this structure, the spring 3531 springs open after the valve 353 is ejected from the valve seat 352 and is supported within the step at the top of the valve seat 352, thereby maintaining smooth flow of the molten metal in the holding furnace.

[0096] In this embodiment, a stirrer 354 is further provided in the holding furnace 35. In this structure, the stirrer 354 is a mechanical stirrer. In other embodiments, a surrounding electromagnetic stirrer can be provided on the periphery of the holding furnace 35 to prevent the ceramic particles from agglomerating and settling.

[0097] In this embodiment, after filling the mold, the center punch 61 moves upward and inserts into the ingode 5 to separate the casting 100 and the handle 101. The movable crossbeam 37 and the holding furnace 35 move upward, and the excess molten metal in the holding furnace 35 continues to accumulate downward along the valve 353 and solidify at the top of the ingode 5, and the holding furnace 35 is separated from the handle 101. In this embodiment, a deformable external part 8 is provided between the upper mold 1 and the lower mold 2. In this structure, an annular groove is provided between the upper mold 1 and the lower mold 2, and an annular external part 8 with a circular cross-section is installed in the groove. The external part 8 is easily deformed under pressure, thereby reducing the longitudinal height and volume of the cavity and ensuring structural space for the casting 100 to deform under pressure.

[0098] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. An extrusion casting device, characterized in that: The invention comprises an upper mold (1), a lower mold (2), an injection system (3) and a mold sealing component (6); the upper mold (1) moves downward and closes the mold with the lower mold (2) to form a mold cavity (4) matching the shape of the casting (100); an inner gate (5) connecting the mold cavity (4) and the injection system (3) is installed on the upper mold (1) or the lower mold (2); the injection system (3) injects metal melt into the mold cavity (4) through the inner gate (5) to fill the mold, and the mold sealing component (6) closes the mold cavity (4) at the inner gate (5) and isolates the casting (100) and its material handle (101).

2. The squeeze casting device according to claim 1, characterized in that: The ingates (5) are provided on the lower mold (2), and the side of the ingates (5) close to the mold cavity (4) is configured as a tapered structure with a large diameter facing the mold cavity (4), and the injection system (3) is located below the lower mold (2).

3. The squeeze casting device according to claim 2, characterized in that: The injection system (3) comprises a lifting mechanism (31), a barrel (32), a filling assembly (33) and a lifting mechanism (34). The barrel (32) is fixedly mounted on the lifting mechanism (31) and can abut against the bottom of the lower mold (2) under the drive of the lifting mechanism (31). The lifting mechanism (34) is fixedly mounted on the lifting mechanism (31). The filling assembly (33) is fixedly mounted on the lifting mechanism (34) and is in sliding contact with the inner wall of the barrel (32). The filling assembly (33) is driven by the lifting mechanism (34) to inject the metal melt into the mold cavity (4) through the inner gate (5).

4. The squeeze casting device according to claim 3, characterized in that: The filling component (33) includes a push rod (331), a tray (332), a filling disk (333) and a spring (334); the push rod (331) is fixed on the second lifting mechanism (34); the tray (332) is sleeved on the push rod (331); the filling disk (333) is embedded in the top of the tray (332) and is slidably connected to the inner wall of the barrel (32); the spring (334) is sleeved on the push rod (331) and abuts between the second lifting mechanism (34) and the tray (332).

5. The squeeze casting device according to claim 4, characterized in that: The tray (332) is provided with a plurality of guide rings (3321) that are in close contact with the inner wall of the barrel (32).

6. The squeeze casting device according to claim 4, characterized in that: The top of the filling plate (333) is provided with a plurality of protrusions (3331), and the protrusions (3331) are abutted against the lower mold (2) under the drive of the second lifting mechanism (34).

7. The squeeze casting device according to claim 6, characterized in that: The bottom of the lower mold (2) is provided with annular grooves (21) on both sides of the inner gate (5), and the protrusion (3331) abuts against the annular grooves (21).

8. The squeeze casting device according to claim 7, characterized in that: The mold sealing component (6) is fixed on the top of the ejection rod (331) and can be driven by the second lifting mechanism (34) to pass through the filling plate (333) and be embedded in the gate (5).

9. The squeeze casting device according to claim 8, characterized in that: The sealing component (6) includes a center punch (61), which is fixed on the second lifting mechanism (34) and is embedded in the gate (5) under the drive of the second lifting mechanism (34). A flow guide (62) is provided in the center punch (61) for quickly cooling the metal melt around the center punch (61).

10. The squeeze casting device according to any one of claims 1 to 9, characterized in that: It also includes an extrusion casting punch (7), which, together with the upper die (1) and the lower die (2), encloses a mold cavity (4) that matches the shape of the casting (100).

11. The squeeze casting device according to claim 7, characterized in that: The mold sealing component (6), the upper mold (1) and the lower mold (2) together enclose a mold cavity (4) that matches the shape of the casting (100). The mold sealing component (6) is inserted into the upper mold (1) and embedded in the gate (5) after filling.

12. The squeeze casting device according to claim 11, characterized in that: The sealing assembly (6) comprises a center punch (61) and a lifting mechanism (3) (63). The center punch (61) is fixed on the lifting mechanism (3) (63) and is embedded in the gate (5) under the drive of the lifting mechanism (3) (63). A flow guide (62) for quickly cooling the metal melt around the center punch (61) is provided in the center punch (61).

13. The squeeze casting device according to claim 12, characterized in that: An easily deformable external part (8) is provided between the upper die (1) and the lower die (2).

14. The squeeze casting device according to claim 2, characterized in that: The injection system (3) comprises a heat preservation furnace (35) and a liquid riser (36). The heat preservation furnace (35) is provided with a gas interface (351). The liquid riser (36) is passed through the heat preservation furnace (35) and communicated with the inner gate (5).

15. The squeeze casting device according to claim 14, characterized in that: The sealing component (6) is configured as a cooling pipe (64), and the cooling pipe (64) is wrapped around the inner gate (5).

16. The squeeze casting device according to claim 15, characterized in that: It also includes an extrusion casting punch (7), which, together with the upper die (1) and the lower die (2), encloses a mold cavity (4) that matches the shape of the casting (100).

17. The squeeze casting device according to claim 1, characterized in that: The inner gate (5) is provided on the upper mold (1), and the inner gate (5) is provided with a tapered structure with a large diameter facing the injection system (3) on the side close to the injection system (3), and the injection system (3) is located above the upper mold (2).

18. The squeeze casting device according to claim 17, characterized in that: The inner gate (5) and the upper mold (1) and the lower mold (2) together enclose a mold cavity (4) that matches the shape of the casting (100); the mold sealing component (6) is passed through the lower mold (2) and embedded in the inner gate (5) after filling.

19. The squeeze casting device according to claim 18, characterized in that: The injection system (3) includes a heat preservation furnace (35) and a movable crossbeam (37). The heat preservation furnace (35) is fixed on the movable crossbeam (37). The movable crossbeam (37) can move up and down relative to the upper mold (1). A gas interface (351) is provided on the heat preservation furnace (35). A valve seat (352) matching the inner gate (5) is provided at the bottom of the heat preservation furnace (35). A valve (353) is embedded in the valve seat (352).

20. The squeeze casting device according to claim 19, wherein: The mold sealing assembly (6) includes a center punch (61) and a lifting mechanism (4) (65). The center punch (61) is fixed on the lifting mechanism (4) (65). Before filling the mold, the center punch (61) moves upward along the inner gate (5) and pushes open the valve (353) under the drive of the lifting mechanism (4) (65); during filling the mold, the center punch (61) moves downward along the inner gate (5) under the drive of the lifting mechanism (4) (65) to guide the metal melt downward for filling the mold; after filling the mold, the center punch (61) moves upward along the inner gate (5) under the drive of the lifting mechanism (4) (65) and is embedded in the inner gate (5). A flow guide (62) for quickly cooling the metal melt around the center punch (61) is provided in the center punch (61).

21. The squeeze casting device according to claim 20, characterized in that: The valve (353) is provided with a spring piece (3531) for supporting the valve (353) on the valve seat (352) after the valve (353) is ejected.

22. The squeeze casting device according to claim 21, characterized in that: A stirrer (354) is also provided in the heat-insulating furnace (35).

23. A molding method based on the squeeze casting molding device according to any one of claims 1 to 22, characterized in that: The following steps are involved: S1: preheating the upper mold (1), the lower mold (2), the injection system (3) and the sealing component (6); S2: The upper mold (1) moves downward and closes with the lower mold (2) to form a cavity (4); S3: pouring the molten metal into the injection system (3), and the injection system (3) injects the molten metal into the mold cavity (4) through the inner gate (5) to fill the mold; S4: After filling the mold, the sealing member (6) closes the mold cavity (4) and separates the casting (100) from the material handle (101); S5: continuously applying pressure to the casting (100) to perform strong shrinkage compensation; S6: The upper die (1) moves upward to remove the casting (100) and the handle (101).

Images