Metal casting machine

Abstract

The invention discloses a metal casting machine, and belongs to the technical field of metal casting. A metal casting machine comprises a melting furnace body, and further comprises a heat-resisting pipe which is arranged on the outer side of the melting furnace body, an inner gear sleeve disc is further arranged at the bottom of the heat-resisting pipe, an upper casting mold is further arranged at the bottom of the inner gear sleeve disc, a lower casting mold is further clamped to the bottom of the upper casting mold, a preheating cover is further arranged on the outer side of the lower casting mold, and a rotating assembly is further arranged on the top of the preheating cover; by arranging the upper casting mold and the lower casting mold which can be flexibly adjusted, the preheating cover and the rotating assembly, the device can be suitable for production of castings in asymmetric or complex shapes; the limitation that a traditional device is mainly used for producing axisymmetric parts is solved, and the application range of the casting technology is widened. The knocking cam of the defoaming and demolding structure knocks the guide wedge block and pushes the abutting plate, so that the device can effectively eliminate bubbles dissolved in molten metal in the casting process, and the casting defect caused by insufficient removal of the bubbles is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting, and particularly relates to a metal casting machine. Background Art

[0002] Metal casting is a metal processing method in which metal is first melted into a liquid at high temperature and then poured into a cavity to obtain a casting with a certain shape. Metal centrifugal casting is a common means of metal casting, which is a method of injecting molten metal into a rotating mold and using centrifugal force to form the required shape. During centrifugal casting, the mold needs to rotate at a high speed, and the molten metal is pushed towards the inner wall of the mold by centrifugal force to form the required product.

[0003] After retrieval, the publication number: CN117282933B discloses a metal casting device. When the driving motor is turned on, the driving motor can drive the driving roller to rotate. Through the rotation of the driving roller, the forming cavity can be driven to rotate. During the rotation of the forming cavity, the fixed rod fixedly connected to the front part of the forming cavity will be driven to rotate. Furthermore, the collar can be driven to rotate outside the special-shaped mounting seat through the fixed rod. The belt is rotated by the first toothed ring fixedly installed on the outside of the collar. Under the driving action of the belt, the second toothed ring is driven to rotate, so that the spaced gear rotates synchronously. At this time, the rotation speed of the spaced gear is very fast. During the process of the baffle rebounding under the action of elastic force, the spaced gear will quickly rotate through the interval, so that the teeth on the spaced gear will contact the tooth grooves at the bottom of the baffle again, and drive the baffle to compress the spring again and rotate towards the inside of the cavity, making the baffle unable to reset smoothly. Finally, the through groove is in an open state, so that the molten metal rotating in the liquid inlet cavity can enter the inside of the forming cavity through the through groove, so that the molten metal with an initial velocity contacts the inner wall of the forming cavity, reducing the impact on the forming cavity, and completing the metal casting under the action of centrifugal force.

[0004] Although the above patent can complete metal casting by centrifugal means, it is mainly used for producing axisymmetric hollow or circular parts and is not suitable for asymmetric or complex-shaped castings. Moreover, the gas dissolved in the molten metal will generate bubbles, and if not fully removed, it will reduce the casting quality; and the mold is not preheated, and its temperature is much lower than the pouring temperature of the molten metal. When the molten metal is poured into the mold, the mold will quickly absorb the heat of the molten metal, resulting in a sharp drop in the temperature of the part of the casting in contact with the mold. This temperature difference will generate a large thermal stress inside the casting and damage the mold. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that when the molten metal is poured into the mold, the mold will quickly absorb the heat of the molten metal, resulting in a sharp drop in the temperature of the part of the casting in contact with the mold. This temperature difference will generate a large thermal stress inside the casting and damage the mold, and a metal casting machine is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A metal casting machine, comprising a melting furnace body, characterized in that it also comprises:

[0008] A heat-resistant pipe is arranged on the outside of the melting furnace body, and an inner gear sleeve is also arranged at the bottom of the heat-resistant pipe, an upper mold is also arranged at the bottom of the inner gear sleeve, a lower mold is also clamped at the bottom of the upper mold, a preheating cover is also arranged on the outside of the lower mold, and a rotating assembly is also arranged on the top of the preheating cover;

[0009] A defoaming and demoulding structure is arranged on the outer side of the preheating cover, wherein the defoaming and demoulding structure includes a special-shaped bracket installed on the outer side of the preheating cover, a stepping motor installed on the top of the special-shaped bracket, a driving shaft installed on the outer side of the stepping motor and rotatably connected to the special-shaped bracket, a knocking cam sleeved on the outer side of the driving shaft, a guide wedge installed on the outer side of the knocking cam and slidably connected to the knocking cam, compression springs installed on both sides of the guide wedge and connected to the special-shaped bracket, and a contact plate installed on the outer side of the guide wedge and in contact with the lower casting mold;

[0010] A hollow support platform is fixedly connected to the bottom of the preheating cover, a support plate is installed on the inner side of the hollow support platform, a ball bearing rotatably connected to the support plate is installed on the top of the support plate, and a direct connection column and a lifting assembly connected to the lower casting mold are installed on the top of the ball bearing;

[0011] A locking structure for locking the upper mold and the lower mold;

[0012] The preheating structure is used to continuously supply heat to the interior of the preheating hood.

[0013] As a preferred technical solution of the present application, the rotating assembly includes a notched bracket installed on the top of the preheating hood, a DC motor installed on the top of the notched bracket, a connecting shaft installed on the outside of the output end of the DC motor, and a locking gear sleeved on the outside of the connecting shaft and meshing with the internal gear sleeve.

[0014] As a preferred technical solution of the present application, the locking structure includes a U-shaped bracket installed at the bottom of the upper casting, an electric telescopic rod installed at the bottom of the U-shaped bracket, a push rod installed on the outside of the electric telescopic rod, a plug-in block installed on the outside of the push rod, and a square slot installed on the inside of the lower casting and connected to the plug-in block.

[0015] As a preferred technical solution of the present application, the preheating structure includes a heating pipe installed on the outside of the melting furnace body, a heat pump installed on one side of the heating pipe, a pre-buried pipe installed on the outside of the heat pump and connected to the preheating hood, and a hot air nozzle installed on the outside of the pre-buried pipe and penetrating the inner wall of the preheating hood.

[0016] As a preferred technical solution of the present application, the lifting assembly includes a limiting slot arranged on the inner side of the hollow support platform, a heavy-duty cylinder installed at the bottom of the limiting slot, and a support column installed on the top of the heavy-duty cylinder and connected to the support plate.

[0017] As a preferred technical solution of the present application, the heavy-duty cylinders are symmetrically distributed inside the hollow pallet, and the outer surface of the support plate does not contact the inner wall of the hollow pallet.

[0018] As a preferred technical solution of the present application, the hot gas nozzles are distributed in a ring shape inside the preheating hood, and the gas outlet end faces of the hot gas nozzles face the connection between the upper casting mold and the lower casting mold.

[0019] As a preferred technical solution of the present application, the guide wedges are arranged in a triangular shape on the outside of the preheating cover, and the surface of one side of the guide wedges close to the abutment plate does not contact the preheating cover.

[0020] As a preferred technical solution of the present application, the top of the upper casting mold is also provided with a one-way air outlet for emptying.

[0021] As a preferred technical solution of the present application, the U-shaped brackets are symmetrically distributed at the bottom of the upper casting mold, and the surfaces of the U-shaped brackets do not contact the inner wall surface of the preheating cover.

[0022] Compared with the prior art, the present invention provides a metal casting machine having the following beneficial effects:

[0023] 1. The metal casting machine, by providing a flexibly adjustable upper mold and lower mold, as well as a preheating cover and a rotating assembly, can be applied to the production of castings with asymmetric or complex shapes; this solves the limitation that the traditional device is mainly used to produce axisymmetric parts, and broadens the application scope of casting technology;

[0024] 2. The metal casting machine uses the knocking cam of the defoaming and demoulding structure to knock the guide wedge and push the contact plate, so that the device can effectively eliminate the bubbles dissolved in the molten metal during the casting process, thereby improving the casting quality, thereby avoiding casting defects caused by insufficient removal of bubbles and ensuring the intrinsic quality of the casting; and after the casting is completed, the gap between the casting and the lower casting mold is expanded by frequently knocking the lower casting mold, thereby facilitating demoulding.

[0025] 3. The metal casting machine, the preheating cover and the preheating structure enable the mold to be preheated to a temperature close to the pouring temperature of the molten metal before pouring. This reduces the rapid absorption of the heat of the molten metal by the mold, avoids the rapid drop in the temperature of the contact part between the casting and the mold, and effectively reduces the damage of thermal stress to the mold and casting;

[0026] 4. Through the coordinated work of components such as the stepper motor, drive shaft, and percussion cam, the metal casting machine realizes automatic control, improving the flexibility and efficiency of the casting process. At the same time, the design of the locking structure and the lifting assembly also facilitates the quick installation, disassembly, and replacement of the mold, further enhancing the convenience of production operations. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a metal casting machine proposed by the present invention;

[0028] Figure 2 It is a distribution diagram of the preheating assembly of a metal casting machine proposed by the present invention;

[0029] Figure 3 It is a schematic structural diagram of the hollow turntable of a metal casting machine proposed by the present invention;

[0030] Figure 4 It is a sectional view of the preheating cover of a metal casting machine proposed by the present invention;

[0031] Figure 5 It is a schematic structural diagram of the defoaming and demolding structure of a metal casting machine proposed by the present invention;

[0032] Figure 6 It is an exploded view of the upper mold and the lower mold of a metal casting machine proposed by the present invention;

[0033] Figure 7 It is a schematic structural diagram of the lifting assembly of a metal casting machine proposed by the present invention;

[0034] Figure 8 It is a metal casting machine proposed by the present invention Figure 6 The schematic structural diagram of part A therein.

[0035] In the figure:

[0036] 1. Melting furnace body; 2. Heat-resistant pipe; 21. Inner gear sleeve disc; 22. Upper casting mold; 23. Lower casting mold; 24. Preheating cover; 25. Rotating assembly; 251. Notch bracket; 252. DC motor; 253. Connecting shaft; 254. Locking gear; 3. Defoaming and demolding structure; 301. Special-shaped bracket; 302. Stepper motor; 303. Driving shaft; 304. Knocking cam; 305. Guide wedge; 306. Compression spring; 307. Contact plate; 4. Hollow support platform; 41. Support disc; 42. Ball bearing; 43. Direct connection column; 44. Lifting assembly; 441. Limit notch; 442. Heavy-duty cylinder; 443. Support column; 5. Locking structure; 501. U-shaped bracket; 502. Electric telescopic rod; 503. Push rod; 504. Insertion block; 505. Square slot; 6. Preheating structure; 601. Heating pipe; 602. Heat pump; 603. Embedded pipeline; 604. Hot gas nozzle; 100. Unidirectional air outlet hole; 101. Exhaust fan; 102. Drawer plate; 103. Roots blower. Detailed implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment:

[0039] Refer to Figures 1-3 , a metal casting machine, including a melting furnace body 1, and further including:

[0040] A heat-resistant pipe 2 is arranged on the outer side of the melting furnace body 1, and an inner gear sleeve disc 21 is further arranged at the bottom of the heat-resistant pipe 2. An upper casting mold 22 is further arranged at the bottom of the inner gear sleeve disc 21. A lower casting mold 23 is clamped at the bottom of the upper casting mold 22. A preheating cover 24 is further arranged on the outer side of the lower casting mold 23. A rotating assembly 25 is further arranged at the top of the preheating cover 24; the molten metal in the melting furnace body 1 is introduced into the lower upper casting mold 22 from the middle of the inner gear sleeve disc 21 through the heat-resistant pipe 2.

[0041] The defoaming and demolding structure 3 is arranged on the outer side of the preheating cover 24. Among them, the defoaming and demolding structure 3 includes a special-shaped support 301 installed on the outer side of the preheating cover 24, a stepping motor 302 installed on the top of the special-shaped support 301, a driving shaft 303 installed on the outer side of the stepping motor 302 and rotatably connected to the special-shaped support 301, a knocking cam 304 sleeved on the outer side of the driving shaft 303, a guiding wedge 305 installed on the outer side of the knocking cam 304 and slidably connected to the knocking cam 304, compression springs 306 installed on both sides of the guiding wedge 305 and connected to the special-shaped support 301, and a contact plate 307 installed on the outer side of the guiding wedge 305 and fitting with the lower mold 23. By the knocking cam 304 of the defoaming and demolding structure knocking the guiding wedge 305 and pushing the contact plate 307, the device can effectively eliminate the bubbles dissolved in the molten metal during the casting process. And after the casting is completed, by frequently knocking the lower mold 23, the gap between the casting and the lower mold 23 is enlarged to facilitate demolding.

[0042] The hollow support platform 4 is fixedly connected to the bottom of the preheating cover 24. A support disc 41 is installed inside the hollow support platform 4, a ball bearing 42 rotatably connected to the support disc 41 is installed on the top of the support disc 41, and a direct connection column 43 and a lifting assembly 44 connected to the lower mold 23 are installed on the top of the ball bearing 42. The support disc 41 is connected to the lower mold 23 through the ball bearing 42 and the direct connection column 43, so as to facilitate the lower mold 23 to rotate together with the upper mold 22.

[0043] The locking structure 5 is installed on the outer sides of the upper mold 22 and the lower mold 23 for locking the upper mold 22 and the lower mold 23, so as to facilitate the full connection of the upper mold 22 and the lower mold 23.

[0044] The preheating structure 6 is installed on the outer side of the melting furnace body 1 for continuously heating the inside of the preheating cover 24, so as to reduce the heat loss and temperature difference during the injection of the molten metal and reduce the damage of the thermal stress to the casting and the mold.

[0045] As Figure 3 and Figure 4 shown, in one embodiment: The rotating assembly 25 includes a notch support 251 installed on the top of the preheating cover 24, a DC motor 252 installed on the top of the notch support 251, a connecting shaft 253 installed on the outer side of the output end of the DC motor 252, and a locking gear 254 sleeved on the outer side of the connecting shaft 253 and meshing with the internal gear sleeve disc 21. Through the gear transmission of the locking gear 254 and the internal gear sleeve disc 21, the upper mold 22 and the lower mold 23 can rotate synchronously.

[0046] As Figure 6 and Figure 8As shown, in one embodiment: The locking structure 5 includes a U-shaped bracket 501 installed at the bottom of the upper mold 22, an electric telescopic rod 502 installed at the bottom of the U-shaped bracket 501, a push rod 503 installed outside the electric telescopic rod 502, a plug-in block 504 installed outside the push rod 503, and a square slot 505 installed inside the lower mold 23 and connected to the plug-in block 504; By fully docking the plug-in block 504 with the square slot 505, it is convenient for the stable connection of the upper mold 22 and the lower mold 23.

[0047] As Figure 2 and Figure 4 shown, in one embodiment: The preheating structure 6 includes a heat supply pipe 601 installed outside the melting furnace body 1, a heat pump 602 installed on one side of the heat supply pipe 601, a pre-buried pipe 603 installed outside the heat pump 602 and connected to the preheating cover 24, and a hot gas nozzle 604 installed outside the pre-buried pipe 603 and penetrating the inner wall of the preheating cover 24; The waste heat in the melting furnace body 1 is supplied to the inside of the preheating cover 24 through the heat supply pipe 601, so as to reduce the heat loss and temperature difference when the molten metal is injected.

[0048] As Figure 3 and Figure 7 shown, in one embodiment: The lifting assembly 44 includes a limit notch 441 provided inside the hollow turntable 4, a heavy-duty cylinder 442 installed at the bottom of the limit notch 441, and a support column 443 installed at the top of the heavy-duty cylinder 442 and connected to the support plate 41; The lower mold 23 is supported bidirectionally by two groups of heavy-duty cylinders 442, so as to stably send the internal casting into the hollow boss.

[0049] As Figure 7 shown, in one embodiment: The heavy-duty cylinders 442 are symmetrically distributed inside the hollow turntable 4, and the outer surface of the support plate 41 does not contact the inner wall of the hollow turntable 4.

[0050] As Figure 4 shown, in one embodiment: The hot gas nozzles 604 are annularly distributed inside the preheating cover 24, and the gas outlet end faces of the hot gas nozzles 604 are facing the connection between the upper mold 22 and the lower mold 23; The annular array of hot gas nozzles 604 is convenient for multi-directional heating of the upper mold 22 and the lower mold 23.

[0051] As Figure 3 and Figure 5 shown, in one embodiment: The guide wedges 305 are arranged in a triangular pattern outside the preheating cover 24, and the surface of the guide wedge 305 close to the contact plate 307 does not contact the preheating cover 24; It is convenient for the contact plate 307 to move freely along the connection of the preheating cover 24, preventing the guide wedge 305 from hitting the preheating cover 24 and reducing the service life of the preheating cover 24.

[0052] AsFigure 6 As shown, in one embodiment: a one-way air vent hole 100 for evacuation is further provided at the top of the upper mold 22, which is used to discharge the excess gas inside the mold.

[0053] As Figure 2 and Figure 4 As shown, in one embodiment: the U-shaped brackets 501 are symmetrically distributed at the bottom of the upper mold 22, and the surface of the U-shaped brackets 501 does not contact the inner wall surface of the preheating cover 24; so as to facilitate the free rotation of the upper mold 22 and the lower mold 23 in the preheating cover 24.

[0054] Specifically, when a metal casting machine is in use: start the Roots blower 103 to provide combustion-supporting air for the melting furnace body 1 and heat the melting furnace body 1 to an appropriate temperature to melt the metal raw material. When the metal melts and reaches the casting temperature, the melted metal is introduced into the upper mold 22 from the middle of the internal gear sleeve disk 21 through the heat-resistant pipe 2. Start the rotating assembly 25, the DC motor 252 drives the connecting shaft 253 and the locking gear 254 to rotate, so that the upper mold 22 and the lower mold 23 rotate together to promote the uniform distribution of the molten metal and the rise of the bubbles. At the same time, start the stepping motor 302 of the defoaming and demolding structure 3, and the drive shaft 303 drives the knocking cam 304 to rotate. The knocking cam 304 knocks the guiding wedge block 305, and through the elastic action of the compression spring 306, the abutting plate 307 frequently knocks the lower mold 23 to effectively eliminate the bubbles dissolved in the molten metal. After the casting is completed, turn off the heating sources of the melting furnace body 1 and the preheating structure 6. When the casting cools for a period of time, the defoaming and demolding structure 3 continues to work, and the gap between the casting and the lower mold 23 is enlarged by frequent knocking to facilitate demolding. During the cooling process, the heavy-duty cylinder 442 of the lifting assembly 44 pushes the support disk 41 and the ball bearing 42 to rise, driving the lower mold 23 and the casting to move downward together. At this time, the electric telescopic rod 502 of the locking structure 5 retracts the push rod 503 and the plug-in block 504 to unlock the upper mold 22 and the lower mold 23 to complete the separation of the upper mold 22 and the lower mold 23. Continue to drive the support disk 41 and the lower mold 23 to separate from the upper mold 22 by the heavy-duty cylinder 442, so that the internal casting enters the limit notch 441 of the hollow support 4. By turning on the exhaust fan 101 to quickly rotate the fan blades, after sufficient cooling, open the pull-out plate 102 and take out the casting.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A metal casting machine, comprising a melting furnace, characterized in that: Also includes: A heat-resistant pipe is arranged on the outside of the melting furnace body, and an inner gear sleeve is also arranged at the bottom of the heat-resistant pipe, an upper mold is also arranged at the bottom of the inner gear sleeve, a lower mold is also clamped at the bottom of the upper mold, a preheating cover is also arranged on the outside of the lower mold, and a rotating assembly is also arranged on the top of the preheating cover; A defoaming and demoulding structure is arranged on the outer side of the preheating cover, wherein the defoaming and demoulding structure includes a special-shaped bracket installed on the outer side of the preheating cover, a stepping motor installed on the top of the special-shaped bracket, a driving shaft installed on the outer side of the stepping motor and rotatably connected to the special-shaped bracket, a knocking cam sleeved on the outer side of the driving shaft, a guide wedge installed on the outer side of the knocking cam and slidably connected to the knocking cam, compression springs installed on both sides of the guide wedge and connected to the special-shaped bracket, and a contact plate installed on the outer side of the guide wedge and in contact with the lower casting mold; A hollow support platform is fixedly connected to the bottom of the preheating cover, a support plate is installed on the inner side of the hollow support platform, a ball bearing rotatably connected to the support plate is installed on the top of the support plate, and a direct connection column and a lifting assembly connected to the lower casting mold are installed on the top of the ball bearing; A locking structure for locking the upper mold and the lower mold; The preheating structure is used to continuously supply heat to the interior of the preheating hood.

2. A metal casting machine according to claim 1, characterized in that: The rotating assembly includes a notch bracket installed on the top of the preheating cover, a DC motor installed on the top of the notch bracket, a connecting shaft installed on the outside of the output end of the DC motor, and a locking gear sleeved on the outside of the connecting shaft and meshing with the internal gear sleeve.

3. A metal casting machine according to claim 1, characterized in that: The locking structure includes a U-shaped bracket installed at the bottom of the upper casting, an electric telescopic rod installed at the bottom of the U-shaped bracket, a push rod installed on the outside of the electric telescopic rod, a plug-in block installed on the outside of the push rod, and a square slot installed on the inside of the lower casting and connected to the plug-in block.

4. A metal casting machine according to claim 1, characterized in that: The preheating structure includes a heating pipe installed outside the melting furnace body, a heat pump installed on one side of the heating pipe, a pre-buried pipeline installed outside the heat pump and connected to the preheating hood, and a hot air nozzle installed outside the pre-buried pipeline and penetrating the inner wall of the preheating hood.

5. A metal casting machine according to claim 3, characterized in that: The lifting assembly comprises a limiting notch arranged on the inner side of the hollow support platform, a heavy-duty cylinder installed at the bottom of the limiting notch, and a supporting column installed on the top of the heavy-duty cylinder and connected to the supporting plate.

6. A metal casting machine according to claim 5, characterized in that: The heavy-duty cylinders are symmetrically distributed inside the hollow support platform, and the outer surface of the support plate does not contact the inner wall of the hollow support platform.

7. A metal casting machine according to claim 4, characterized in that: The hot air nozzles are distributed in a ring shape inside the preheating cover, and the gas outlet end faces of the hot air nozzles face the connection between the upper casting mold and the lower casting mold.

8. A metal casting machine according to claim 1, characterized in that: The guide wedges are arranged in a triangle shape on the outer side of the preheating cover, and a surface of one side of the guide wedges close to the abutment plate does not contact the preheating cover.

9. A metal casting machine according to claim 1, characterized in that: The top of the upper casting mold is also provided with a one-way air outlet for emptying.

10. A metal casting machine according to claim 3, characterized in that: The U-shaped brackets are symmetrically distributed at the bottom of the upper casting mold, and the surfaces of the U-shaped brackets do not contact the inner wall surface of the preheating cover.

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