A three-section structure for the lower mold of a wheel hub mold

Abstract

This utility model discloses a three-section structure for the lower mold of a wheel hub mold, including: a lower mold for the wheel hub, a lower mold section body provided on the inner cavity of the lower mold through a mold base, a lower mold section water-cooling insert for the lower mold section body which is fixed with bolts for disassembly and replacement, and a lower mold section cold water insert for the lower mold section which is fixed with screws for disassembly and replacement. Through the independent water-cooling structure of the lower mold section cold water insert, the cooling efficiency of the original weak heat dissipation area can be enhanced, the local temperature can be reduced quickly, and the segmented water cooling makes the temperature distribution of each area more balanced, reducing the thermal deformation of the mold caused by temperature difference and improving the quality of wheel hub forming. The lower mold section two and three both adopt the insert structure fixed with bolts / screws. When a certain section or the easily corroded third section is worn or corroded, it is not necessary to disassemble or replace the entire lower mold, but only to replace the corresponding insert, which greatly reduces maintenance costs and downtime.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a three-section structure of the lower mold of a wheel hub mold. Background Technology

[0002] Existing bus ferries, due to their heavy load capacity, typically have several small windows on their wheel spokes to increase load-bearing capacity and strength. The wheel hub design of bus ferries differs from that of automobiles; typical passenger cars have various styles, such as multi-spoke or composed of small spokes. Figure 4 The design of a bus wheel is basically similar to the large disc wheel rim of a Mercedes-Benz. However, the mold for the bus wheel has a flaw: because it lacks spokes, its cooling performance is relatively poor. Since the spokes of the bus wheel are just a few small windows, its heat dissipation is also poor. Furthermore, the third section of the lower mold has a consistently high temperature due to its slow heat dissipation, which leads to faster corrosion of the third section of the lower mold. Utility Model Content

[0003] The purpose of this utility model is to provide a three-section structure for the lower mold of a wheel hub mold to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a three-section structure for the lower mold of a wheel hub mold, comprising:

[0005] The lower mold of the wheel hub has a lower mold section body provided in the mold cavity on the inner side of the lower mold through the mold base. The lower mold section body is provided with a lower mold section water-cooling insert that is fixed with bolts for disassembly and replacement. The lower mold section water-cooling insert is provided with a lower mold section cold water insert that is fixed with screws for disassembly and replacement. The lower mold section cold water insert is provided with a gate component that injects the injection liquid of the bus wheel hub into the wheel hub cavity through bolts.

[0006] The lower mold end of the wheel hub has a wheel hub upper mold that forms a bus wheel hub forming cavity with the lower mold and has a cooling structure. The lower mold first section body, the lower mold second section water-cooling insert and the lower mold third section cold water insert are all provided with water-cooling pipe cavities for cooling the formed wheel hub.

[0007] Preferably, the water-cooled pipe cavity in the lower mold section body has an external water inlet and an external water outlet at both ends extending to the bottom of the lower mold section body.

[0008] Preferably, the two ends of the water-cooling pipe cavity in the lower mold two-section water-cooling insert extend to the bottom of the lower mold two-section water-cooling insert and are respectively provided with a central water inlet and a central water outlet.

[0009] Preferably, the water-cooled pipe cavity in the three-section cold water insert of the lower mold has an inner inlet and an inner outlet at both ends extending to the bottom of the three-section cold water insert of the lower mold, respectively.

[0010] Preferably, the mold base is fixed to the bottom of the lower mold of the wheel hub with screws to fix the lower mold body and the mold cavity of the lower mold of the wheel hub together.

[0011] Preferably, the gate component is fixed to the gate seat at the lower end of the inner cavity of the three-section cold water insert of the lower mold, and a ceramic tube is sleeved on the upper end of the gate seat, and a lower mold sleeve is provided on the outside of the ceramic tube.

[0012] Preferably, the bottom of the lower mold sleeve is supported on the inner cavity boss at the end of the sprue seat, and the top of the lower mold sleeve is supported in the sealing groove provided at the bottom of the inner cavity of the three-section cold water insert of the lower mold. The sprue sleeve is fitted into the inner limit of the top of the lower mold sleeve, and the sprue sleeve is connected to the mold cavity of the lower mold of the wheel hub.

[0013] Preferably, the outer side of the lower mold second-section water-cooled insert is provided with a combined ring block, and the lower mold second-section water-cooled insert is locked and fixed by the combined ring block after being assembled into the inner cavity of the lower mold first section body.

[0014] Preferably, the upper mold of the wheel hub is provided with a fixed mold base at the top and a mold core that fits into the mold cavity of the lower mold of the wheel hub at the lower end.

[0015] Compared with the prior art, the technical effects and advantages of this utility model are: the lower mold of the wheel hub mold has a three-section structure.

[0016] By dividing the lower mold into a lower mold body section, a lower mold water-cooling insert section, and a lower mold cold water insert section, each section is equipped with an independent water-cooling pipe cavity, and the inlet and outlet of each section's water-cooling cavity are independently set, such as external inlet / external outlet, middle inlet / middle outlet, and internal inlet / internal outlet. Through the independent water-cooling structure of the lower mold's three-section cold water insert, the cooling efficiency of the original weak heat dissipation area can be enhanced, the local temperature can be quickly reduced, corrosion problems caused by long-term high temperature can be avoided, the service life of the mold can be extended, and the segmented water cooling makes the temperature distribution of each area more balanced, reduces the thermal deformation of the mold caused by temperature difference, and improves the quality of wheel hub forming.

[0017] Modular assembly and disassembly: The second and third sections of the lower mold are both fixed with bolts / screws. When a section or the easily corroded third section is worn or corroded, there is no need to disassemble or replace the entire lower mold. Only the corresponding insert needs to be replaced, which greatly reduces maintenance costs and downtime.

[0018] Ceramic tube and lower mold sleeve combination: A ceramic tube is inserted into the sprue seat, utilizing the high temperature resistance and corrosion resistance of ceramics to reduce the direct scouring and corrosion of the sprue area by the injection liquid; a lower mold sleeve is set on the outside, with a sealing groove embedded at the top to support the sprue sleeve, which not only improves structural stability but also enhances sealing performance to prevent liquid leakage. In addition, the double protection of the ceramic tube and the lower mold sleeve can extend the service life of the sprue components and reduce mold downtime maintenance caused by sprue damage. Attached Figure Description

[0019] Figure 1 This is the main view of the wheel hub mold of this utility model;

[0020] Figure 2 This is a top view of the three-section structure of the lower mold of this utility model;

[0021] Figure 3 This is a drawing of the lower mold section of the present invention.

[0022] Figure 4 This is a drawing of the two-section water-cooled insert of the lower mold of this utility model;

[0023] Figure 5 This is a drawing of the three-section cold water insert of the lower mold of this utility model;

[0024] Figure 6 This is an exploded view of the gating component of this utility model.

[0025] In the diagram: 1. Lower mold of the wheel hub; 2. Lower mold section 1 body; 3. Lower mold section 2 water-cooling insert; 4. Lower mold section 3 cold water insert; 5. Sprue component; 6. Upper mold of the wheel hub; 7. Mold base; 8. Water-cooling pipe cavity; 9. External water inlet; 10. External water outlet; 11. Middle water inlet; 12. Middle water outlet; 13. Internal water inlet; 14. Internal water outlet; 15. Sprue seat; 16. Ceramic tube; 17. Lower mold sleeve; 18. Sprue sleeve; 19. Combined ring block; 20. Fixed mold base; 21. Mold core. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-6 This utility model provides a technical solution: a three-section structure for the lower mold of a wheel hub mold, comprising:

[0028] The lower mold 1 of the wheel hub has a mold cavity on the inner side of the mold base 7 with a lower mold body 2 (the mold base 7 is fastened to the lower mold 1 with a pre-set screw hole at the bottom of the lower mold 1 with high-strength bolts to form a stable bottom support structure). The lower mold body 2 has a lower mold second section water-cooled insert 3 which is fixed with bolts for disassembly and replacement (the bolts are evenly distributed around the lower mold body 2 and the positioning pins ensure the installation accuracy of the insert). The lower mold second section water-cooled insert 3 has a lower mold third section cold water insert 4 which is fixed with screws for disassembly and replacement (the screws are designed to prevent loosening and are equipped with spring washers to prevent loosening under high-frequency vibration). The lower mold third section cold water insert 4 has a gate component 5 on the inner side of the lower mold for injecting the injection liquid of the bus wheel hub into the wheel hub cavity (the bolt connection part is surface hardened to enhance the shear resistance).

[0029] The lower mold 1 of the wheel hub has an upper mold 6 at its end, which together form a bus wheel hub forming cavity and has a cooling structure. The cooling structure of the upper mold 6 includes an annular water channel, which forms a coordinated cooling loop with the water cooling system of the lower mold. The lower mold body 2, the lower mold water cooling insert 3, and the lower mold water cooling insert 4 are all provided with water cooling pipe cavities 8 for cooling the formed wheel hub. The water cooling pipe cavities 8 adopt a spiral layout to increase the contact area between the cooling water and the mold wall and improve the heat exchange efficiency.

[0030] The water-cooled pipe cavity 8 in the lower mold section 1 body 2 extends through both ends to the bottom of the lower mold section 1 body 2 and is respectively provided with an external water inlet 9 and an external water outlet 10. Both the external water inlet 9 and the external water outlet 10 are equipped with quick-connect connectors for easy connection to an external water chiller. The water-cooled pipe cavity 8 in the lower mold section 2 water-cooled insert 3 extends through both ends to the bottom of the lower mold section 2 water-cooled insert 3 and is respectively provided with a middle water inlet 11 and a middle water outlet 12. The middle water inlet 11 and the middle water outlet 12 are diagonally distributed to ensure that the cooling water forms a turbulent flow effect within the insert. The water-cooled pipe cavity 8 in the lower mold section 3 cold water insert 4 extends through both ends to the bottom of the lower mold section 3 cold water insert 4 and is respectively provided with an internal water inlet 13 and an internal water outlet 14. The diameter of the internal water inlet 13 is 10% larger than that of the external water inlet to meet the flow supply requirements of areas with high heat dissipation demands.

[0031] Each water circuit can be equipped with an intelligent temperature control valve and flow sensor, and segmented PID regulation can be achieved through PLC, with a temperature difference control accuracy of ±2℃.

[0032] The mold base 7 is fixed to the bottom of the lower mold 1 of the hub with screws to fix the lower mold body 2 and the mold cavity of the lower mold 1. The screw holes are machined with high precision by boring and milling, and the positioning key is used to achieve millimeter-level assembly accuracy. The gate component 5 is fixed to the gate seat 15 at the lower end of the inner cavity of the lower mold three-section cold water insert 4. The gate seat 15 and the lower mold three-section cold water insert 4 are pre-positioned by interference fit and then locked again by bolts. A ceramic tube 16 is sleeved on the upper end of the gate seat 15. The ceramic tube 16 is made of zirconia ceramic material and can withstand the scouring of molten metal at a high temperature of over 1200℃. The outer side of the ceramic tube 16 is provided with a lower mold sleeve 17. The lower mold sleeve 17 is made of high-strength graphite steel and the surface is hard chrome plated to enhance wear resistance.

[0033] The bottom of the lower mold sleeve 17 is supported on the inner cavity boss at the end of the sprue seat 15. The height of the boss is calculated mechanically to ensure the structural stability of the sleeve when subjected to injection pressure. The top of the lower mold sleeve 17 is supported in the sealing groove at the bottom of the inner cavity of the lower mold three-section cold water insert 4. An O-ring is embedded in the sealing groove to form a double sealing and leak-proof structure. The sprue sleeve 18 is fitted into the inner limit of the top of the lower mold sleeve 17. The inner wall of the sprue sleeve 18 is polished to Ra0.2μm to reduce the flow resistance of the molten liquid. The sprue sleeve 18 is connected to the mold cavity of the lower mold 1 of the wheel hub. The connection is designed with a chamfered transition to avoid the formation of cold shut defects due to molten metal retention.

[0034] The outer side of the lower mold second-section water-cooled insert 3 is provided with a combined ring block 19. The combined ring block 19 has a two-half structure and is locked together by fastening bolts to achieve circumferential positioning of the insert and the body. After the lower mold second-section water-cooled insert 3 is assembled into the inner cavity of the lower mold first-section body 2, it is locked and fixed by the combined ring block 19. The locking torque is controlled at 80-100 N·m to ensure the heat conduction efficiency between the insert and the body. The top of the wheel hub upper mold 6 is provided with a fixed mold base 20. The fixed mold base 20 is connected to the injection molding machine template through a T-slot to meet the needs of quick mold change. The lower end of the wheel hub upper mold 6 is provided with a mold core 21 that closes with the mold cavity of the wheel hub lower mold 1 (the surface of the mold core 21 is treated with PVD coating to improve anti-sticking performance and service life).

[0035] Specifically, during use, the upper mold 6 and the lower mold 1 of the wheel hub are closed to form the bus wheel hub molding cavity. The three-section structure, consisting of the lower mold body 2, the lower mold water-cooling insert 3, and the lower mold cooling water insert 4, is connected to an independent water circulation system through the outer water inlet 9 / outer water inlet 10, the middle water inlet 11 / middle water outlet 12, and the inner water inlet 13 / inner water outlet 14, respectively. The sprue component 5 guides the injection liquid into the mold cavity through the sprue sleeve 18. The water-cooling pipe cavities 8 of each section are tightly attached to the inner wall of the mold cavity, providing precise heat dissipation for areas of the bus wheel that are prone to high temperatures (especially the third section of the lower mold). The independent water channel design allows for flexible adjustment of the cooling intensity in different areas, avoiding local overheating, ensuring uniform cooling of the wheel hub, reducing defects such as shrinkage cavities and deformation, and improving molding quality and production efficiency.

[0036] The second-section water-cooled insert 3 of the lower mold is connected to the first-section body 2 of the lower mold by bolts and locked by the combined ring block 19. The third-section water-cooled insert 4 of the lower mold is fixed to the inner side of the second section of the lower mold by screws. When a section of the insert is worn, corroded, or damaged, the corresponding part can be directly disassembled and replaced without disassembling the entire lower mold. The ceramic tube 16, lower mold sleeve 17, and sprue sleeve 18 in the sprue component 5 also support independent disassembly and assembly, facilitating quick maintenance of vulnerable parts. This modular design significantly reduces downtime and maintenance costs, and is particularly suitable for industrial equipment such as large wheel molds that need to withstand high loads and high corrosion for a long time.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A three-section structure of a lower die of a wheel hub mold, characterized by, include: The lower mold of the wheel hub (1) has a mold cavity on the inner side of the mold base (7) with a lower mold body (2). The lower mold body (2) has a lower mold second section water-cooled insert (3) fixed with bolts for disassembly and replacement. The lower mold second section water-cooled insert (3) has a lower mold third section cold water insert (4) fixed with screws for disassembly and replacement. The lower mold third section cold water insert (4) has a gate component (5) for injecting the bus wheel hub injection liquid into the wheel hub cavity with bolts. The lower mold (1) of the wheel hub has an upper mold (6) at the end that forms a bus wheel hub forming cavity with the lower mold (1) and has a cooling structure. The lower mold first section body (2), the lower mold second section water-cooling insert (3) and the lower mold third section cold water insert (4) are all provided with water-cooling pipe cavities (8) for cooling the formed wheel hub.

2. The three-section structure of the lower die of a wheel hub mold according to claim 1, characterized in that: The water-cooled pipe cavity (8) in the lower mold section (2) extends through both ends to the bottom of the lower mold section (2) and is provided with an external water inlet (9) and an external water outlet (10).

3. The three-section structure of the lower die of a wheel hub mold according to claim 1, characterized in that: The water-cooled pipe cavity (8) in the lower mold two-section water-cooled insert (3) extends to the bottom of the lower mold two-section water-cooled insert (3) and is respectively provided with a middle water inlet (11) and a middle water outlet (12).

4. The three-section structure of the lower die of a wheel hub mold according to claim 1, characterized in that: The water-cooled pipe cavity (8) in the lower mold three-section cold water insert (4) extends to the bottom of the lower mold three-section cold water insert (4) and is respectively provided with an inner water inlet (13) and an inner water outlet (14).

5. The three-section structure of the lower die of a wheel hub mold according to claim 1, characterized in that: The mold base (7) is fixed to the bottom of the lower mold (1) of the hub with screws to fix the mold cavity combination of the lower mold body (2) and the lower mold (1).

6. The three-section structure of the lower die of a wheel hub mold according to claim 1, characterized in that: The gate component (5) is fixed to the gate seat (15) at the lower end of the inner cavity of the three-section cold water insert (4) of the lower mold. The gate seat (15) is fitted with a ceramic tube (16) from the upper end. The outer side of the ceramic tube (16) is provided with a lower mold sleeve (17).

7. The three-section structure of the lower die of a wheel hub mold according to claim 6, characterized in that: The bottom of the lower mold sleeve (17) is supported on the inner cavity boss of the sprue seat (15), and the top of the lower mold sleeve (17) is supported in the sealing groove provided at the bottom of the inner cavity of the three-section cold water insert (4) of the lower mold. The sprue sleeve (18) is fitted into the inner limit of the top of the lower mold sleeve (17), and the sprue sleeve (18) is connected to the mold cavity of the lower mold of the wheel hub (1).

8. The three-section structure of the lower mold of a wheel hub mold according to claim 1, characterized in that: The lower mold second-section water-cooled insert (3) is provided with a combined ring block (19) on the outside, and the lower mold second-section water-cooled insert (3) is locked and fixed by the combined ring block (19) after being assembled into the inner cavity of the lower mold first-section body (2).

9. The three-section structure of the lower mold of a wheel hub mold according to claim 1, characterized in that: The upper mold (6) of the wheel hub is provided with a fixed mold base (20) at the top, and the lower end of the upper mold (6) of the wheel hub is provided with a mold core (21) that fits into the mold cavity of the lower mold (1) of the wheel hub.

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