A casting device and casting method for wheel hubs of building materials machinery parts

Abstract

This invention discloses a casting device and method for wheel hubs of building material machinery parts. The device includes a mold assembly comprising a split mold core and two half-mold sleeves, which are joined to form a total inner cavity. A heat-conducting ring block is fixedly connected to the inner wall of each half-mold sleeve, and a heat dissipation plate is provided on the half-mold sleeve, with the plate surrounding the heat-conducting ring block. A piston ring matching the rim cavity in the total inner cavity is fitted around the outer periphery of the mold core. The bottom ports of the rim cavity and the heat dissipation plate are connected via a connecting cavity. The molten casting is injected from the feeding chamber and accumulates above the piston ring. The piston ring descends to expel air from the rim cavity to accommodate the molten casting above the piston ring. The air discharged from the rim cavity is discharged outward through the heat dissipation plate for air cooling of the molten casting above the piston ring from bottom to top, thus forming a stepped cooling and molding process from bottom to top, reducing the probability of air bubbles appearing in the molten casting.

Description

Technical Field

[0001] This invention belongs to the field of wheel hub casting technology, and particularly relates to a wheel hub casting device and casting method for building material machinery parts. Background Technology

[0002] A wheel hub is a cylindrical metal component mounted on an axle that supports the tire's inner contour. It is also called a wheel rim, steel rim, wheel, or tire rim. Wheel hubs come in many varieties depending on their diameter, width, molding method, and materials. A wheel hub mainly consists of a rim, flange, and spokes. Different rim types are often used depending on the application. For some larger equipment vehicles used in construction machinery, flat-bottomed rims are commonly used. The center of a flat-bottomed rim is often cylindrical to provide more stable support.

[0003] Wheel hubs are mainly manufactured using two methods: gravity casting and forging. Gravity casting: molten aluminum alloy is poured into a mold using gravity, and after forming, it is processed and polished on a lathe to complete production. Forging: A single aluminum ingot is directly extruded into shape on a mold using a press with thousands of tons of pressure.

[0004] In existing technologies, gravity casting is a simple manufacturing process that does not require precise casting technology, resulting in low cost and high production efficiency. Therefore, wheel hubs in building materials machinery parts are often cast using this method. However, when the molten casting enters the mold cavity, the air in the mold cavity may not have enough time to escape from the vent. The mixture of molten casting and air in the mold cavity leads to the formation of air bubbles (sand holes) and uneven density, which affects the quality of the cast products. Summary of the Invention

[0005] To address the problems in the prior art, the present invention proposes the following technical solution:

[0006] A wheel hub casting device for building material machinery accessories includes a mold kit, which includes a split mold core and two half mold sleeves. The mold core and the two half mold sleeves are closed to form a total inner cavity.

[0007] The inner wall of the half mold sleeve is fixedly connected with a heat-conducting ring block. The half mold sleeve is provided with a heat dissipation plate cavity, and the heat dissipation plate cavity is coiled around the outer periphery of the heat-conducting ring block. The outer periphery of the mold core is fitted with a piston ring that matches the rim cavity in the overall inner cavity. The bottom port of the rim cavity and the heat dissipation plate cavity are connected through a connecting cavity.

[0008] The molten casting is injected from the feed chamber and accumulates above the piston ring. The piston ring descends to empty the air in the rim cavity to accommodate the molten casting above the piston ring. The air discharged from the rim cavity is discharged outward through the heat dissipation plate cavity for air cooling of the molten casting above the piston ring from bottom to top, thereby forming a stepped cooling and molding of the molten casting from bottom to top.

[0009] As a preferred embodiment of the above technical solution, the overall internal cavity further includes a mold cavity, an ejector cavity, and a side ejector cavity;

[0010] The ejector cavity is formed by two half-mold sleeves. The bottom end of the ejector cavity is connected to the top end of the mold cavity, and the top end of the ejector cavity extends beyond the top end of the half-mold sleeve.

[0011] The side vent cavity is formed by two half-mold sleeves. One end of the side vent cavity is connected to the top port of the heat sink cavity, and the other end of the side vent cavity extends out of the outer side of the half-mold sleeve.

[0012] As a preferred embodiment of the above technical solution, the mold cavity includes a rim cavity, a flange cavity, and a flange cavity that are interconnected.

[0013] The rim cavity and wheel flange cavity are connected vertically and are both formed by the mold core and half mold fitting together.

[0014] As a preferred embodiment of the above technical solution, the bottom end of the mold core is provided with an annular inner cavity that matches the piston ring, the top end of the piston ring is machined into an arc shape, and when the piston ring descends into the annular inner cavity, a complete hub mold cavity is formed.

[0015] As a preferred embodiment of the above technical solution, the mold core includes an upper mold core and a lower mold core, the radial mating portion of the upper mold core and the lower mold core is provided with a mating block and a mating groove, and the spoke cavity is formed by the upper mold core and the lower mold core being molded together.

[0016] As a preferred embodiment of the above technical solution, the piston ring has a hollow structure, with an air inlet and an air outlet at the bottom. When the piston ring descends into the annular inner cavity, the air outlet and the top of the connecting cavity are aligned.

[0017] The two half-molds are fitted together to form an air intake chamber. One end of the air intake chamber is connected to the output end of an external air cooler. When the piston ring descends into the annular inner cavity, the air intake hole and the other end of the air intake chamber are aligned.

[0018] As a preferred embodiment of the above technical solution, the bottom of the module kit is provided with a base, and the bottom of the base is provided with a lifting mechanism, which is used for lifting and lowering the piston rings.

[0019] As a preferred embodiment of the above technical solution, the lifting mechanism includes a connecting rod fixed to the bottom of the piston ring, the connecting rod passing through the half mold sleeve and the base and extending to the bottom of the base, and a sleeve block is sleeved around the bottom end of the connecting rod and fastened by fastening bolts;

[0020] The lifting mechanism also includes a lifting motor. The output shaft of the lifting motor is fixedly connected to a threaded rod. A threaded sleeve is provided on the outer thread of the threaded rod, and the threaded sleeve and the sleeve block are connected by a connecting rod.

[0021] A casting method, applied to the aforementioned casting device for a wheel hub of a building materials machinery component, the casting method comprising the following steps:

[0022] S1. Mold closing: First, place the mold core between the two half mold sleeves. The two half mold sleeves face each other and move closer together to close the mold core into the inner cavity between the two half mold sleeves. Then fix it to complete the mold closing process.

[0023] S2, Casting: The molten casting is injected from the feed chamber and accumulates above the piston ring. The piston ring descends and empties the air in the rim cavity to accommodate the molten casting above the piston ring. The air discharged from the rim cavity is discharged outward through the heat dissipation plate cavity for air cooling of the molten casting above the piston ring from bottom to top, thereby forming a stepped cooling and molding of the molten casting from bottom to top.

[0024] S3. Demolding: First, separate the two half mold sleeves, remove the molded hub and mold core from the inner cavity of the half mold sleeves, and then remove the mold core from the hub. This completes the entire demolding process.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The molten casting is injected from the feeding chamber and accumulates above the piston ring. The piston ring descends to expel the air in the rim cavity to accommodate the molten casting above the piston ring. This greatly reduces the amount of air mixed into the molten casting from the mold cavity, thus reducing the probability of air bubbles appearing in the molten casting. The air discharged from the rim cavity is discharged outward through the heat dissipation plate cavity for air cooling of the molten casting above the piston ring from bottom to top, thereby forming a stepped cooling and molding process of the molten casting from bottom to top. Corresponding to the air already mixed in the molten casting, due to the principle of thermal expansion and contraction, the air in the molten casting will flow towards the direction of the hotter molten casting. Under the cooling and heat dissipation effect of the molten casting from bottom to top, the air in the molten casting will gradually flow upward and then overflow from the top air cavity, thereby further eliminating the air in the molten casting, further reducing the probability of air bubbles appearing in the molten casting, and improving the quality of the product.

[0027] 2. The two half-molds are fitted together to form an air intake chamber. One end of the air intake chamber is connected to the output end of an external cooling fan. When the piston ring descends into the annular inner cavity, the air intake hole and the other end of the air intake chamber are aligned. At this time, the cooling fan blows air from the air intake chamber into the inner cavity of the piston ring, thereby cooling the piston ring and the molten casting above the piston ring. The cold air is then discharged from the air outlet, passes through the connecting cavity, and is then transported from the connecting cavity to the heat dissipation plate cavity. Finally, it is discharged outward from the side air outlet cavity. This further allows for bottom-up air cooling of the molten casting in the mold cavity, forming a bottom-up stepped cooling and molding process. This not only speeds up the wheel hub molding time but also further eliminates air in the molten casting, further reducing the probability of bubbles appearing in the molten casting and improving product quality. Attached Figure Description

[0028] Figure 1 The diagram shown is a top-view three-dimensional structural schematic of the present invention;

[0029] Figure 2 The diagram shown is a three-dimensional structural diagram of the semi-mold sleeve in this invention;

[0030] Figure 3 The figure shown is a cross-sectional view of the middle part of the mold assembly in the state where the piston ring is located in the rim cavity in this invention;

[0031] Figure 4 The figure shown is a cross-sectional view of the middle part of the mold assembly with the piston ring of the present invention in the annular inner cavity state;

[0032] Figure 5 The diagram shown is a cross-sectional view of the piston ring in this invention;

[0033] Figure 6 The diagram shown is a three-dimensional structural diagram of the piston ring in this invention;

[0034] Figure 7 The diagram shown is a bottom-view three-dimensional structural schematic of the present invention;

[0035] Figure 8 The diagram shown is a schematic diagram of the mold sleeve fixing component structure in this invention.

[0036] Figure Labels

[0037] 10. Base; 11. Support foot; 20. Mold assembly; 21. Half mold sleeve; 22. Bottom fixing component; 221. Bottom fixing plate; 222. Bottom fixing bolt; 23. Mold sleeve fixing component; 231. Mold sleeve fixing plate; 232. Mold sleeve fixing bolt; 233. Mold sleeve fixing nut; 24. Heat-conducting ring block; 25. Piston ring; 251. Air inlet; 252. Air outlet; 26. Mold core; 261. Upper mold core; 262. Lower mold core; 2 7. Heat dissipation plate cavity; 30. Main inner cavity; 31. Feed cavity; 32. Mold cavity; 321. Rim cavity; 322. Wheel flange cavity; 323. Wheel spoke cavity; 33. Ejection cavity; 34. Side exhaust cavity; 35. Inlet cavity; 36. Connecting cavity; 37. Annular inner cavity; 40. Lifting mechanism; 41. Lifting motor; 42. Threaded rod; 43. Threaded sleeve; 44. Connecting rod; 45. Sleeve block; 46. Connecting plumb rod; 47. Fastening bolt. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0039] like Figure 1 , Figure 2 As shown

[0040] A casting device for wheel hubs of building material machinery parts includes a mold assembly 20. The mold assembly 20 includes a split mold core 26 and two half mold sleeves 21. First, the mold core 26 is placed between the two half mold sleeves 21. The two half mold sleeves 21 are brought closer together to close the mold core 26 in the inner cavity between the two half mold sleeves 21. Then, it is fixed to complete the mold closing process. The two half mold sleeves 21 are fixed together by a mold sleeve fixing member 23, and the half mold sleeves 21 and the base 10 are fixed together by a bottom fixing member 22, thereby ensuring the overall stability during subsequent casting.

[0041] like Figure 3 As shown

[0042] The mold core 26 and two half-mold sleeves 21 are closed to form a total inner cavity 30. A heat-conducting ring block 24 is fixedly connected to the inner cavity wall of the half-mold sleeve 21. The heat-conducting ring block 24 plays the role of heat conduction and auxiliary heat dissipation. A heat dissipation plate cavity 27 is provided on the half-mold sleeve 21, and the heat dissipation plate cavity 27 is coiled around the outer periphery of the heat-conducting ring block 24. In this way, when the air passes through the heat dissipation plate cavity 27, it can carry away the heat conducted on the heat-conducting ring block 24, thereby playing the role of auxiliary air cooling of the casting liquid on the inner wall of the heat-conducting ring block 24. A piston ring 25 matching the rim cavity 321 in the total inner cavity 30 is sleeved on the outer periphery of the mold core 26. The bottom port of the rim cavity 321 and the heat dissipation plate cavity 27 are connected through a connecting cavity 36.

[0043] The molten casting is injected from the feed chamber 31 and accumulates above the piston ring 25. The piston ring 25 descends to empty the air in the rim cavity 321 to accommodate the molten casting above the piston ring 25. This greatly reduces the amount of air mixed into the molten casting in the mold cavity 32, thus reducing the probability of air bubbles appearing in the molten casting. The air discharged from the rim cavity 321 is discharged outward through the heat dissipation plate cavity 27 for air cooling of the molten casting above the piston ring 25 from bottom to top, thereby forming a stepped cooling and molding process of the molten casting from bottom to top. Corresponding to the air already mixed in the molten casting, due to the principle of thermal expansion and contraction, the air in the molten casting will flow towards the direction of the hotter molten casting. Under the cooling and heat dissipation effect of the molten casting from bottom to top, the air in the molten casting will gradually flow upward and then overflow from the ejector air cavity 33, thereby further eliminating the air in the molten casting, further reducing the probability of air bubbles appearing in the molten casting, and improving the quality of the product.

[0044] The main internal cavity 30 also includes a mold cavity 32, an ejector cavity 33, and a side ejector cavity 34;

[0045] The ejector vent 33 is formed by the closing of two half mold sleeves 21. The bottom end of the ejector vent 33 is connected to the top end of the mold cavity 32, and the top of the ejector vent 33 extends beyond the top of the half mold sleeves 21. The ejector vent 33 can be used for venting the top of the mold cavity 32. When the mold cavity 32 is filled with molten casting, the molten casting will spread to the top along the ejector vent 33. Therefore, it can be determined whether the mold cavity 32 is filled with molten casting by observing whether molten casting spreads out from the top of the ejector vent 33.

[0046] The side air outlet cavity 34 is formed by the closing of two half mold sleeves 21. One end of the side air outlet cavity 34 is connected to the top port of the heat dissipation plate cavity 27, and the other end of the side air outlet cavity 34 extends out of the outer side of the half mold sleeve 21. The side air outlet cavity 34 is used to discharge air from the heat dissipation plate cavity 27.

[0047] The mold cavity 32 includes a rim cavity 321, a flange cavity 322, and a flange cavity 322 that are interconnected; the flange cavity 322 and the rim cavity 321 are connected vertically and are both formed by the mold core 26 and the half mold sleeve 21.

[0048] like Figure 4 As shown

[0049] The bottom end of the mold core 26 has an annular inner cavity 37 that matches the piston ring 25. The top end of the piston ring 25 is machined into an arc shape, and when the piston ring 25 descends into the annular inner cavity 37, it forms a complete hub mold cavity.

[0050] The mold core 26 includes an upper mold core 261 and a lower mold core 262. The radial mating portions of the upper mold core 261 and the lower mold core 262 are provided with mating blocks and mating grooves, and the spoke cavity 323 is formed by the closing of the upper mold core 261 and the lower mold core 262; during the process...

[0051] like Figure 5 As shown

[0052] The piston ring 25 has a hollow structure. The bottom of the piston ring 25 has an air inlet 251 and an air outlet 252. When the piston ring 25 descends into the annular inner cavity 37, the air outlet 252 and the top of the connecting cavity 36 are aligned. During mold closing, the upper mold core 261 and the lower mold core 262 are joined to form the mold core 26 and the air outlet 252. During mold disassembly, the upper mold core 261 and the lower mold core 262 are removed in the radial direction, and then the embedded cast wheel hub can be removed.

[0053] Two half-mold sleeves 21 close to form an air intake chamber 35. One end of the air intake chamber 35 is connected to the output end of an external air cooler. When the piston ring 25 descends into the annular inner cavity 37, the air intake hole 251 and the other end of the air intake chamber 35 are connected. At this time, the air cooler blows air from the air intake chamber 35 into the inner cavity of the piston ring 25, thereby cooling the piston ring 25 and the molten casting above the piston ring 25. The cold air is then discharged from the air outlet 252, passes through the connecting cavity 36, and is then transported from the connecting cavity 36 to the heat dissipation plate cavity 27. Finally, it is discharged outward from the side air outlet cavity 34. This further allows for bottom-up air cooling of the molten casting in the mold cavity 32, forming a bottom-up stepped cooling and molding process. This not only speeds up the wheel hub molding time but also further eliminates air in the molten casting, further reducing the probability of bubbles in the molten casting and improving product quality.

[0054] like Figure 6 , Figure 7 As shown

[0055] The bottom of the module assembly 20 is provided with a base 10, and the bottom of the base 10 is provided with a lifting mechanism 40, which is used for lifting the piston ring 25.

[0056] The lifting mechanism 40 includes a connecting rod 46 fixed to the bottom of the piston ring 25. The connecting rod 46 passes through the half mold sleeve 21 and the base 10 and extends to the bottom of the base 10. A sleeve block 45 is fitted around the bottom end of the connecting rod 46 and is fastened by a fastening bolt 47. The sleeve block 45 and the fastening bolt 47 facilitate the installation and disassembly of the connecting rod 46, thereby facilitating the installation and removal of the piston ring 25 and the connecting rod 46 during the demolding process.

[0057] The lifting mechanism 40 also includes a lifting motor 41. The output shaft of the lifting motor 41 is fixedly connected to a threaded rod 42. A threaded sleeve 43 is threaded around the threaded rod 42, and the threaded sleeve 43 and the sleeve block 45 are connected by a connecting rod 44.

[0058] The working principle of the lifting mechanism 40 is as follows: the lifting motor 41 drives the threaded rod 42 to rotate, and under the threaded transmission, the threaded sleeve 43 is driven to rise and fall. Under the connection of the connecting rod 44, the sleeve block 45 and the connecting vertical rod 46 are driven to rise and fall synchronously.

[0059] like Figure 8 As shown

[0060] The mold sleeve fixing component 23 includes a mold sleeve fixing piece 231 integrally fixedly connected to the side of the half mold sleeve 21. When the two opposing half mold sleeves 21 are closed, the two mold sleeve fixing pieces 231 move closer to each other and are then tightened and closed by the mold sleeve fixing bolt 232 and the mold sleeve fixing nut 233.

[0061] A casting method, applied to the aforementioned casting device for a wheel hub of a building materials machinery component, includes the following steps:

[0062] S1. Mold closing: First, place the mold core 26 between the two half mold sleeves 21. The two half mold sleeves 21 face each other and move closer together to close the mold core 26 in the inner cavity between the two half mold sleeves 21. Then fix it to complete the mold closing process.

[0063] S2, Casting: The molten casting is injected from the feed chamber 31 and accumulates above the piston ring 25. The piston ring 25 descends and empties the air in the rim cavity 321 to accommodate the molten casting above the piston ring 25. The air discharged from the rim cavity 321 is discharged outward through the heat dissipation plate cavity 27 for the air cooling of the molten casting above the piston ring 25 from bottom to top, thereby forming a stepped cooling and molding of the molten casting from bottom to top.

[0064] S3. Demolding: First, separate the two half mold sleeves 21, remove the shaped wheel hub and mold core 26 from the inner cavity of the half mold sleeves 21, and then remove the mold core 26 from the wheel hub. This completes the entire demolding process.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A construction machinery accessory wheel hub casting apparatus comprising a mold set (20), characterized by, The mold set (20) comprises a split mold core (26) and two half mold sets (21), and the mold core (26) and the two half mold sets (21) are combined to form a total inner cavity (30); The inner cavity wall of the half mold set (21) is fixedly connected with a heat conduction ring block (24) in a built-in manner, the half mold set (21) is provided with a heat dissipation disc cavity (27), and the heat dissipation disc cavity (27) is coiled around the periphery of the heat conduction ring block (24); the periphery of the mold core (26) is provided with a piston ring (25) matched with a rim cavity (321) in the total inner cavity (30); the rim cavity (321) and the bottom port of the heat dissipation disc cavity (27) are connected through a communication cavity (36); The casting liquid is injected into the self-feeding cavity (31) and accumulated above the piston ring (25), the piston ring (25) is lowered to empty the air in the rim cavity (321) for containing the casting liquid above the piston ring (25), the air discharged from the rim cavity (321) is discharged outward through the heat dissipation disc cavity (27) for air cooling of the casting liquid from bottom to top above the piston ring (25), thereby forming stepwise cooling and forming of the casting liquid from bottom to top; The total inner cavity (30) further comprises a mold cavity (32), an ejection gas cavity (33) and a side gas cavity (34); The ejection gas cavity (33) is formed by combining the two half mold sets (21), the bottom end of the ejection gas cavity (33) is connected with the top end of the spoke cavity (323), and the top of the ejection gas cavity (33) extends out of the top of the half mold set (21); The side gas cavity (34) is formed by combining the two half mold sets (21), one end of the side gas cavity (34) is connected with the top port of the heat dissipation disc cavity (27), and the other end of the side gas cavity (34) extends out of the outer side of the half mold set (21); The mold cavity (32) comprises the rim cavity (321), the rim cavity (322) and the spoke cavity (323) which are connected with each other; The rim cavity (322) and the rim cavity (321) are connected in sequence and are formed by combining the mold core (26) and the half mold set (21); The bottom end of the mold core (26) is provided with an annular built-in cavity (37) matched with the piston ring (25), the top end of the piston ring (25) is processed into an arc surface, and when the piston ring (25) is lowered into the annular built-in cavity (37), a complete hub mold cavity is formed; The mold core (26) comprises an upper mold core (261) and a lower mold core (262), and the spoke cavity (323) is formed between the upper mold core (261) and the lower mold core (262); The piston ring (25) is a hollow structure, the bottom of the piston ring (25) is provided with an air inlet hole (251) and an air outlet hole (252), and when the piston ring (25) is lowered into the annular built-in cavity (37), the air outlet hole (252) is connected with the top end of the communication cavity (36); The two half mold sets (21) are combined to form an air inlet cavity (35), one end of the air inlet cavity (35) is connected with the output end of an external air cooler, and when the piston ring (25) is lowered into the annular built-in cavity (37), the air inlet hole (251) is connected with the other end of the air inlet cavity (35).

2. The cast wheel apparatus for a construction machine component according to claim 1, wherein The mold kit (20) is provided with a base (10) at the bottom, the bottom of the base (10) is provided with a lifting mechanism (40), and the lifting mechanism (40) is used for lifting the piston ring (25).

3. The cast wheel apparatus for a building material machine component according to claim 2, wherein The lifting mechanism (40) includes a connecting vertical rod (46) fixed at the bottom of the piston ring (25), the connecting vertical rod (46) penetrates the half mold cover (21) and the base (10) and extends below the base (10), the bottom end of the connecting vertical rod (46) is peripherally sleeved with a sleeve block (45) and is fastened by a fastening bolt (47); The lifting mechanism (40) further includes a lifting motor (41), the output shaft of the lifting motor (41) is fixedly connected with a threaded rod (42), the threaded rod (42) is peripherally threaded with a threaded sleeve (43), and the threaded sleeve (43) and the sleeve block (45) are connected by a connecting rod (44).

4. A casting method characterized by, The casting method is applied to the building material machinery accessory hub casting device of any one of claims 1-3, and the casting method comprises the following steps: S1, molding: first, the mold core (26) is placed between the two half mold covers (21), the two half mold covers (21) are opposite and close to each other to mold the mold core (26) in the inner cavity between the two half mold covers (21), then fixed, and then the molding process is completed; S2, casting: the casting liquid is injected from the feeding cavity (31) into the piston ring (25) above, the piston ring (25) is lowered to empty the air in the rim cavity (321) for containing the casting liquid above the piston ring (25), the air discharged from the rim cavity (321) is discharged outward through the heat dissipation disc cavity (27) for air cooling of the casting liquid from bottom to top above the piston ring (25), and then the step-by-step cooling forming of the casting liquid from bottom to top is formed; S3, demolding: first, the two half mold covers (21) are separated, the formed hub and the mold core (26) are taken out from the inner cavity of the half mold cover (21), then the mold core (26) is taken out from the hub, and the whole demolding process is completed.

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