Device and method for gravity casting of motorcycle hub

Abstract

The invention discloses a device and method for gravity casting of a motorcycle hub. The device comprises a base, a bottom plate installed on the upper portion of the base, a mold installed on the upper portion of the bottom plate, a gear sleeve arranged in the mold, a pressurizing cavity formed in the position, below the gear sleeve, in the mold, and a driving mechanism arranged on the upper portion of the base and connected with a pressurizing piece in a driving mode. The pressurizing part is at least partially located in the pressurizing cavity, and the driving mechanism acts on the pressurizing part. According to the device, alloy liquid on the periphery of the gear sleeve can be pressurized, so that a gap between the gear sleeve and a formed hub is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and more particularly to a device and method for gravity casting a motorcycle wheel hub. Background Art

[0002] There is a certain gap between the aluminum alloy substrate and the gear sleeve of the gravity cast motorcycle aluminum alloy wheel hub. Reducing this gap can ensure that the gear sleeve will not loosen or make abnormal noises during the later use of the motorcycle wheel hub. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a device and method for gravity casting a motorcycle wheel hub.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The invention discloses a device for gravity casting a motorcycle wheel hub, comprising a base, a bottom plate installed on the upper part of the base, a mold installed on the upper part of the bottom plate, a gear sleeve arranged in the mold, a pressurizing chamber arranged below the gear sleeve in the mold, a driving mechanism arranged on the upper part of the base, a pressurizing member driven and connected by the driving mechanism, the pressurizing member at least partially located in the pressurizing chamber, the driving mechanism acts on the pressurizing member, the pressurizing member rises in the pressurizing chamber to extrude alloy liquid in the pressurizing chamber, the extruded alloy liquid acts on the alloy liquid around the gear sleeve, and the alloy liquid around the gear sleeve is pressurized.

[0006] Furthermore, the mold includes a lower mold core arranged on the bottom plate, an upper mold core is arranged above the lower mold core, a plurality of hafs are arranged on the periphery of the lower mold core and the upper mold core, and a feed sleeve is arranged in the middle position of the upper mold core.

[0007] Furthermore, a clamping pin is connected to the upper part of the lower mold core, and a clamping hole matching with the clamping pin is opened on the upper mold core.

[0008] Furthermore, a riser ring is arranged on the upper part of the upper mold core, the outer periphery of the riser ring is arranged to abut against the inner wall of the Hafu, and a riser is opened on the riser ring.

[0009] Furthermore, a pressing plate is arranged on the upper part of the upper mold core, and a part of the pressing plate is pressed on the feed sleeve.

[0010] Furthermore, the pressure member includes a lifting plate whose outer wall is arranged to fit the inner wall of the pressure chamber, a step hole is opened inside the lifting plate, a limit plate is arranged in the step hole, the outer diameter of the limit plate is the same as the diameter of the large hole in the step hole, an installation plate is arranged below the lifting plate, the diameter of the installation plate is larger than the diameter of the small hole in the step hole, a support rod is connected to the upper end of the installation plate, the upper end of the support rod is connected to the lower end of the limit plate, a blind hole is opened in the lifting plate, a spring is arranged in the blind hole, the upper end of the spring is connected to the top wall of the blind hole, and the lower end of the spring is connected to the upper end of the installation plate.

[0011] Furthermore, a cooling cone is arranged on the upper part of the limiting plate.

[0012] A method for gravity casting a motorcycle wheel hub comprises the following steps:

[0013] S1. Install the mold, install the gear sleeve in the mold, and set a pressurizing chamber at the position below the gear sleeve of the mold. Move the pressurizing member to the lowest position in the pressurizing chamber so that the pressurizing chamber is in the maximum volume state;

[0014] S2, injecting the smelted alloy liquid into the mold through the feed sleeve, and the pressurized cavity is filled with the alloy liquid;

[0015] S3, the driving mechanism acts on the pressurizing member to make it rise in the pressurizing chamber, so that the space between the gear sleeve and the pressurizing member is reduced, and the alloy liquid in the space pressurizes the alloy liquid around the gear sleeve under pressure;

[0016] S4. After the alloy liquid is completely solidified, the product is ejected by controlling the pressure piece to continue rising.

[0017] Furthermore, the temperature of the alloy liquid is 700-750°C.

[0018] Furthermore, a filter screen is placed in the feed sleeve to filter the alloy liquid.

[0019] The beneficial effect of the present invention is that during the time period from the completion of gravity casting pouring and filling to the completion of solidification, the liquid aluminum alloy at the edge of the gear sleeve is locally pressurized by the mold ejector rod through the pressurizing device, so as to achieve the purpose of reducing the gap between the aluminum alloy and the gear sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a device for gravity casting a motorcycle wheel hub in this embodiment;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0022] Figure 3 A schematic diagram of the structure of the pressure member in this embodiment;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of center A.

[0024] Figure numerals: 1. base; 2. bottom plate; 3. lower mold core; 4. upper mold core; 5. Harv; 6. gear sleeve; 7. pressure piece; 8. pressurizing chamber; 9. cooling cone; 10. clamping pin; 11. feed sleeve; 12. pressure plate; 13. riser ring; 14. riser; 15. driving mechanism; 16. lifting plate; 17. step hole; 18. limit plate; 19. mounting plate; 20. through hole; 21. liquid inlet pipe; 22. liquid outlet pipe; 23. lifting rod; 24. support rod; 25. spring; 26. blind hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] As attached Figure 1 -Attached Figure 4 As shown, a device for gravity casting a motorcycle wheel hub comprises a base 1, a bottom plate 2 is mounted on the top of the base 1, and a mold is mounted on the top of the bottom plate 2. The mold comprises a lower mold core 3 arranged on the bottom plate 2, an upper mold core 4 is arranged above the lower mold core 3, a plurality of hafur 5 are arranged on the outer periphery of the lower mold core 3 and the upper mold core 4, and a feed sleeve 11 is arranged in the middle of the upper mold core 4.

[0027] A gear sleeve 6 is provided in the mold, a pressurized cavity 8 is provided at a position below the gear sleeve 6 in the mold, a driving mechanism 15 is provided on the upper part of the base 1, and a pressurized member 7 is connected to the driving mechanism 15, and the pressurized member 7 is at least partially located in the pressurized cavity 8. During the casting process, the driving mechanism 15 acts on the pressurized member 7 to make the pressurized member 7 rise in the pressurized cavity 8, and the pressurized member 7 squeezes the alloy liquid above when it moves, and the squeezed alloy liquid acts on the alloy liquid around the gear sleeve 6, and the alloy liquid around the gear sleeve 6 is pressurized, so that there is no gap between the alloy liquid and the gear sleeve, and they can be better combined.

[0028] A clamping pin 10 is connected to the upper part of the lower mold core 3, and a clamping hole matched with the clamping pin 10 is opened on the upper mold core 4. The clamping pin 10 and the clamping hole cooperate with each other to perform positioning when the mold is closed.

[0029] A riser ring 13 is arranged on the upper part of the upper mold core 4, and the outer periphery of the riser ring 13 is arranged to abut against the inner wall of the hafu 5. A riser 14 is opened on the riser ring 13, and the riser 14 is connected with the cavity inside the mold. The alloy liquid can be added to the cavity of the mold through the riser 14 to play a role in shrinkage compensation, so that the wheel hub can be formed normally.

[0030] A pressing plate 12 is provided on the upper part of the upper mold core 4 , and a part of the pressing plate 12 is pressed on the feed sleeve 11 , thereby completing the fixing of the feed sleeve 11 .

[0031] The pressure member 7 includes a lifting plate 16, the outer wall of which is arranged to fit the inner wall of the pressure chamber 8. A step hole 17 is provided inside the lifting plate 16, and a limit plate 18 is provided inside the step hole 17. The outer diameter of the limit plate 18 is the same as the diameter of the large hole in the step hole 17, and the diameter of the limit plate 18 is the same as the bottom diameter of the gear sleeve 6. A mounting plate 19 is provided below the lifting plate 16, and the diameter of the mounting plate 19 is larger than the diameter of the small hole in the step hole 17. A support rod 24 is connected to the upper end of the mounting plate 19, and the upper end of the support rod 24 is connected to the lower end of the limit plate 18. A blind hole 26 is provided inside the lifting plate 16, and a spring 25 is provided inside the blind hole 26. The upper end of the spring 25 is connected to the top wall of the blind hole 26, and the lower end of the spring 25 is connected to the upper end of the mounting plate 19. In the initial state, under the action of the spring 25, the upper end surface of the limit plate 18 is flush with the upper end surface of the lifting plate 16. At this time, when the driving mechanism 15 drives the lifting plate 16 to rise, the limiting plate 18 also rises synchronously, and acts together on the alloy liquid in the pressurizing chamber 8 to pressurize the alloy liquid together. When the limiting plate 18 contacts the bottom of the gear sleeve 6, the limiting plate 18 can be retracted into the step hole 17, and the lifting plate 16 can continue to move upward by an end distance, further squeezing the alloy liquid, so that the alloy liquid moves to the periphery of the gear sleeve 6, so that the alloy liquid around the gear sleeve 6 is further pressurized to reduce the gap between the gear sleeve 6 and the wheel hub.

[0032] A cooling cone 9 is provided on the upper part of the limiting plate 18, and a liquid inlet pipe 21 and a liquid outlet pipe 22 are connected to the lower part of the cooling cone 9. The liquid inlet pipe 21 and the liquid outlet pipe 22 are provided through the through hole 20 on the mounting plate 19. A cooling channel is provided in the cooling cone 9, and the liquid inlet pipe 21 and the liquid outlet pipe 22 are respectively connected to the two ends of the cooling channel. The provision of the liquid inlet pipe 21 and the liquid outlet pipe 22 allows the coolant to enter and flow in the cooling cone 9, and the cooling cone 9 can cool the alloy liquid located around the gear sleeve 6, so that this part of the pressurized alloy liquid is quickly formed, and the coolant is prevented from continuing to flow to other positions and reducing the pressure.

[0033] The lifting plate 16 and the inner wall of the pressurizing chamber 8, and the limiting plate 18 and the inner wall of the step hole 17 are tightly fitted to achieve good sealing.

[0034] The driving mechanism 15 is a cylinder, and the cylinder drives and connects the jacking rod 23, and the upper end of the jacking rod 23 is connected to the bottom of the lifting plate 16. The cylinder is provided with an inlet and outlet valve, and the lifting and lowering of the jacking rod 23 is controlled by adjusting the inlet and outlet valve.

[0035] A method for gravity casting a motorcycle wheel hub comprises the following steps:

[0036] The mold is installed, and a gear sleeve 6 is installed in the mold. A pressurizing chamber 8 is provided at the position of the mold below the gear sleeve 6. A pressurizing member 7 is provided in the pressurizing chamber 8. The pressurizing member 7 moves to the lowest position in the pressurizing chamber 8, so that the pressurizing chamber 8 is in a maximum volume state.

[0037] The smelted alloy liquid is injected into the mold through the feed sleeve 11, and the pressurized cavity 8 is filled with the alloy liquid, and the temperature of the alloy liquid is 700-750°C.

[0038] A filter screen is placed in the feed sleeve 11 to filter the alloy liquid.

[0039] The driving mechanism 15 acts on the pressure piece 7 to make it rise in the pressure chamber 8, so that the volume between the gear sleeve 6 and the pressure piece 7 is reduced, and the alloy liquid there moves toward the periphery of the gear sleeve 6 under pressure, thereby acting on the alloy liquid around the gear sleeve 6 to pressurize and compensate for its shrinkage.

[0040] After the alloy liquid is completely solidified, the product is ejected by controlling the pressure member 7 to continue to rise.

[0041] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A device for gravity casting a motorcycle wheel hub, characterized in that: The invention comprises a base (1), a bottom plate (2) is installed on the top of the base (1), a mold is installed on the top of the bottom plate (2), a gear sleeve (6) is arranged in the mold, a pressurizing chamber (8) is arranged in the mold below the gear sleeve (6), a driving mechanism (15) is arranged on the top of the base (1), a pressurizing member (7) is connected to the driving mechanism (15), the pressurizing member (7) is at least partially located in the pressurizing chamber (8), the driving mechanism (15) acts on the pressurizing member (7), the pressurizing member (7) rises in the pressurizing chamber (8) to extrude the alloy liquid in the pressurizing chamber (8), the extruded alloy liquid acts on the alloy liquid around the gear sleeve (6), and the alloy liquid around the gear sleeve (6) is pressurized.

2. The device for gravity casting a motorcycle wheel hub according to claim 1, characterized in that: The mold comprises a lower mold core (3) arranged on a bottom plate (2), an upper mold core (4) is arranged above the lower mold core (3), a plurality of hafn (5) are arranged on the periphery of the lower mold core (3) and the upper mold core (4), and a feed sleeve (11) is arranged in the middle of the upper mold core (4).

3. The device for gravity casting a motorcycle wheel hub according to claim 2, characterized in that: The upper part of the lower mold core (3) is connected with a mold pin (10), and the upper mold core (4) is provided with a mold hole matched with the mold pin (10).

4. The device for gravity casting a motorcycle wheel hub according to claim 2, characterized in that: A riser ring (13) is arranged on the upper part of the upper mold core (4), the outer periphery of the riser ring (13) is arranged to abut against the inner wall of the hafu (5), and a riser (14) is opened on the riser ring (13).

5. The device for gravity casting a motorcycle wheel hub according to claim 2, characterized in that: A pressing plate (12) is arranged on the upper part of the upper mold core (4), and a part of the pressing plate (12) is pressed on the feed sleeve (11).

6. The device for gravity casting a motorcycle wheel hub according to claim 2, characterized in that: The pressure member (7) comprises a lifting plate (16) whose outer wall is arranged to fit the inner wall of the pressure chamber (8); a step hole (17) is provided inside the lifting plate (16); a limiting plate (18) is provided inside the step hole (17); the outer diameter of the limiting plate (18) is the same as the diameter of the large hole in the step hole (17); a mounting plate (19) is provided below the lifting plate (16); the diameter of the mounting plate (19) is larger than the diameter of the small hole in the step hole (17); a support rod (24) is connected to the upper end of the mounting plate (19); the upper end of the support rod (24) is connected to the lower end of the limiting plate (18); a blind hole (26) is provided inside the lifting plate (16); a spring (25) is provided inside the blind hole (26); the upper end of the spring (25) is connected to the top wall of the blind hole (26); and the lower end of the spring (25) is connected to the upper end of the mounting plate (19).

7. The device for gravity casting a motorcycle wheel hub according to claim 6, characterized in that: A cooling cone (9) is arranged on the upper part of the limiting plate (18).

8. A method for gravity casting a motorcycle wheel hub, characterized in that: The method of gravity casting a motorcycle wheel hub according to any one of claims 1 to 7 comprises the following steps: S1. Install the mold, install the gear sleeve (6) in the mold, and provide a pressurizing chamber (8) at a position below the gear sleeve (6) in the mold. Move the pressurizing member (7) to the lowest position in the pressurizing chamber (8), so that the pressurizing chamber (8) is in a state of maximum volume; S2, injecting the smelted alloy liquid into the mold through the feed sleeve (11), and the pressurizing chamber (8) is filled with the alloy liquid; S3, the driving mechanism (15) acts on the pressure member (7) to make it rise in the pressure chamber (8), so that the space between the gear sleeve (6) and the pressure member (7) is reduced, and the alloy liquid in the space pressurizes the alloy liquid around the gear sleeve (6) under pressure; S4. After the alloy liquid is completely solidified, the product is ejected by controlling the pressure member (7) to continue to rise.

9. The method for gravity casting a motorcycle wheel hub according to claim 8, characterized in that: In step S2, the temperature of the alloy liquid is 700-750°C.

10. The method for gravity casting a motorcycle wheel hub according to claim 8, characterized in that: A filter is placed in the casting sleeve to filter the alloy liquid.

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