Low-pressure casting mold suitable for large-riser hub

Abstract

The utility model relates to the field of low-pressure casting dies for aluminum alloy hubs, and discloses a low-pressure casting die suitable for large-riser hubs, which comprises a bottom die, a riser area of the bottom die is provided with a convex structure, and the convex structure forms a step shape on the front surface of a top die so as to reduce the casting thickness of the riser area of a hub blank, so that the casting thickness of the hub blank is reduced. And the dead head area of the bottom die can be conveniently and effectively cooled. According to the utility model, the convex structure is arranged in the riser area of the bottom die, and the step shape is formed on the front surface of the bottom die, so that the casting thickness of the riser area of the hub blank is effectively reduced, the riser area of the bottom die is conveniently and effectively cooled, the casting defects such as shrinkage porosity caused by the cooling problem of the hub blank 30 are improved, and the casting quality of the hub blank 30 is improved. The production efficiency and the yield are improved; and meanwhile, the workload of follow-up machining treatment of the riser area of the hub blank is reduced, the metal utilization rate is increased, and the production cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low pressure casting mould of aluminium alloy wheel hub, especially to a low pressure casting mould suitable for large riser wheel hub. BACKGROUND

[0002] In the aluminium alloy wheel hub casting process, for large riser slotting products, the traditional mould structure usually adopts the plane structure that the riser plane is lower than the bolt column height, the mould structure is simple, and the design and production cost is low. But in the production practice, the mould bottom mould cooling is difficult to meet the concentrated cooling of the riser slotting position due to the restriction of the safety thickness of the mould body. If the riser area position cooling is strengthened, the riser cooling is too strong, the flow is cut off, the spoke and the rim are loose, and the cooling effect of the riser slotting position is difficult to guarantee, thereby the flange slotting position of the large riser slotting product is prone to shrinkage defects, the batch waste products are caused, and the production efficiency and the yield are affected. At the same time, due to the special structure of the large riser slotting product, the product riser position is thick, and the machining workload is high, thereby the aluminium processing cost is wasted, the product metal utilization rate is low, and the production cost is increased. In addition, the riser plane of the traditional mould bottom mould is lower than the bolt column height, the aluminium liquid is blocked in the mould filling process due to the bolt column, the aluminium liquid filling process is blocked, the flow is divided and flows into the spoke, the product aluminium liquid filling is affected, and the spoke and the spoke root shrinkage problem is prone to form.

[0003] Therefore, developing a low pressure casting mould suitable for large riser wheel hub and applied to the production practice is the current urgent problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at the above problems, provides a low pressure casting mould suitable for large riser wheel hub to solve the problems that the existing aluminium alloy wheel hub low pressure casting mould is prone to cause spoke and rim shrinkage defects in the production of large riser slotting products, affects the production efficiency and the yield, and solves the problems that the product machining workload is large, the metal utilization rate is low, and the cost is high.

[0005] To solve the above technical problems, the utility model adopts the technical scheme that:

[0006] A low pressure casting mould suitable for large riser wheel hub, including bottom mould, the riser area of the bottom mould is provided with outer convex structure, the outer convex structure forms the ladder shape modeling on the top die front surface, so as to thin the pouring thickness of the wheel hub blank riser area, and facilitate the effective cooling of the bottom mould riser area.

[0007] Preferably, the included angle between the outer edge of the outer convex structure and the horizontal direction of the bottom mould is 75-77 DEG, so that the draft angle of the outer convex structure is 13-15 DEG, to facilitate the demoulding operation of the wheel hub blank.

[0008] Preferably, the bottom die back surface is provided with a cooling process hole corresponding to the outward protruding structure part, which is used for cooling the outward protruding structure part.

[0009] Preferably, the upper end surface of the outward protruding structure is higher than the bolt column height of the bottom die, so as to reduce the influence of the bolt column on the aluminum liquid filling.

[0010] Preferably, the mold further comprises a top die, and a flange area of the top die is provided with an inward recess structure corresponding to the outward protruding structure on the bottom die, so that the riser area of the hub blank is shaped in a stepped manner.

[0011] Preferably, the depth of the inward recess structure is 35-45mm, so as to ensure the cavity thickness of the mold flange area.

[0012] Preferably, the front surface of the top die is provided with a weight-reducing protrusion, and the weight-reducing protrusion is arranged in a staggered manner corresponding to the bolt column of the bottom die.

[0013] The front surface of the top die is further provided with a weight-reducing circular table corresponding to the bolt column of the bottom die.

[0014] The beneficial effects of the present application are as follows: the outward protruding structure is arranged in the riser area of the bottom die, and the front surface of the bottom die is formed in a stepped manner, thereby effectively reducing the pouring thickness of the riser area of the hub blank, facilitating effective cooling of the riser area of the bottom die, and solving the problem that the cooling of the mold bottom die is restricted by the safety thickness of the mold body, and it is difficult to meet the concentrated cooling of the riser slotting position, and the strengthening of the riser area position cooling is easy to cause the riser to be cooled too strongly, resulting in the shrinkage of the spoke and the rim; and the weakening of the riser area cooling is difficult to ensure the cooling effect of the riser slotting position, causing the flange slotting position of the large riser slotting product to be prone to shrinkage defects, resulting in batch waste, affecting the production efficiency and the yield. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0016] Fig. 1-2 It is a three-dimensional structure schematic view of the present application.

[0017] Fig. 3 It is a local plane structure schematic view of the use state of the present application.

[0018] In the diagram: 10--bottom mold; 11--outward convex structure; 12--cooling process hole; 13--bolt post; 20--top mold; 21--inward concave structure; 22--weight reduction protrusion; 23--weight reduction truncated cone; 30--wheel hub blank. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] like Fig. 1-3 As shown, a low-pressure casting mold suitable for large riser wheel hubs includes a bottom mold 10. The riser area of ​​the bottom mold 10 is provided with an outwardly protruding structure 11. The outwardly protruding structure 11 forms a stepped shape on the front of the bottom mold 10 to reduce the pouring thickness of the riser area of ​​the wheel hub blank 30. This facilitates effective cooling of the riser area of ​​the bottom mold 10. It effectively solves the problem that the cooling of the bottom mold 10 is limited by the safety thickness of the mold body, making it difficult to meet the concentrated cooling of the riser slot. Strengthening the cooling of the riser area can easily lead to excessive cooling and flow interception, resulting in shrinkage porosity of the spokes and rim. On the other hand, weakening the cooling of the riser area makes it difficult to guarantee the cooling effect of the riser slot, causing shrinkage porosity defects in the flange slot of products with large riser slots, resulting in batch scrap and affecting production efficiency and yield. At the same time, it reduces the workload of subsequent machining of the riser area of ​​the wheel hub blank 30, improves metal utilization, and saves production costs.

[0021] In a preferred embodiment, the angle between the outer edge of the convex structure 11 and the horizontal direction of the bottom mold 10 is 75-77°, so that the draft angle of the convex structure 11 is 13-15°, which facilitates the demolding operation of the wheel hub blank 30 and avoids damaging the wheel hub blank 30.

[0022] Preferably, the bottom mold 10 has a cooling process hole 12 on the back corresponding to the convex structure 11, which is used to cool the convex structure 11. The cooling process hole 12 can be used to precisely and efficiently cool the convex structure 11 by introducing cooling air or cooling water and other cooling media, which can further improve the casting defects such as shrinkage caused by cooling problems in the wheel hub blank 30, and improve production efficiency and yield.

[0023] Preferably, the upper end face of the convex structure 11 is higher than the height of the bolt post 13 of the bottom mold 10, so as to reduce the influence of the bolt post 13 on the aluminum liquid filling. During filling, the high-temperature aluminum liquid can flow directly into the spoke runner after passing through the riser area, avoiding the obstruction of the aluminum liquid by the bolt post 13 during the filling process, which would cause problems such as turbulence of aluminum liquid and poor filling. This effectively solves the problem that shrinkage defects are prone to occur in the spokes and spoke roots of the wheel hub blank 30.

[0024] The mold further comprises a top die 20, a flange area of the top die 20 is provided with an inner recess structure 21, the inner recess structure 21 is provided corresponding to the outer convex structure 11 on the bottom die 10, so that the riser area of the hub blank 30 is stepped, while reducing the pouring thickness of the mold riser area, the sufficient runner of the area is ensured, the smooth filling of the aluminum liquid is ensured, and the problem of cutting off the hub blank 30 due to insufficient runner is avoided.

[0025] Preferably, the depth of the inner recess structure 21 is 35-45mm to ensure the cavity thickness of the mold flange area. Under the premise of meeting the sufficient runner of the mold, the pouring thickness of the area is effectively reduced, the aluminum liquid consumption is saved, the subsequent machining workload is reduced, and the production cost is saved.

[0026] Preferably, the top die 20 is provided with a weight-reducing protrusion 22 on the front surface, and an inner recess weight-reducing cavity is formed at the hub blank 30 flange position during casting, and the weight-reducing protrusion 22 is arranged in a staggered manner corresponding to the bolt column 13 of the bottom die 10. The weight-reducing protrusion 22 can further improve the metal utilization rate and is beneficial to improve the heat dissipation of the flange area.

[0027] Preferably, the top die 20 is further provided with a weight-reducing circular platform 23 on the front surface, and the weight-reducing circular platform is arranged corresponding to the bolt column 13 of the bottom die 10. During casting, a hole structure is reserved at the bolt hole position of the hub blank, the subsequent machining workload is further reduced, the metal utilization rate is improved, and the bolt hole porosity problem in the die casting process can be effectively improved. Preferably, the draft angle of the weight-reducing circular platform 23 is greater than 11° to ensure smooth drawing.

[0028] The above disclosure is only a specific embodiment of the utility model, but the utility model is not limited to this. For ordinary skilled persons in the art, without departing from the principle of the utility model, the deformation made should be considered as belonging to the protection of the utility model.

Claims

1. A low-pressure casting mold suitable for large riser wheel hubs, characterized in that: Includes a bottom mold (10), the riser area of ​​the bottom mold (10) is provided with an outward convex structure (11), the outward convex structure (11) forms a stepped shape on the front of the bottom mold (10) to reduce the pouring thickness of the riser area of ​​the wheel hub blank (30) and facilitate effective cooling of the riser area of ​​the bottom mold (10).

2. The low-pressure casting mold suitable for large riser wheel hubs according to claim 1, characterized in that: The angle between the outer edge of the convex structure (11) and the bottom mold (10) in the horizontal direction is 75-77°, so that the draft angle of the convex structure (11) is 13-15°, so as to facilitate the demolding operation of the wheel hub blank (30).

3. The low-pressure casting mold suitable for large riser wheel hubs according to claim 1, characterized in that: The bottom mold (10) has a cooling process hole (12) on the back corresponding to the convex structure (11) for cooling the convex structure (11). The cooling process hole (12) can be used to introduce cooling air or cooling water to carry out precise and efficient cooling of the convex structure (11).

4. A low-pressure casting mold suitable for large riser wheel hubs according to claim 1, characterized in that: The upper end face of the convex structure (11) is higher than the height of the bolt column (13) of the bottom mold (10) to reduce the influence of the bolt column (13) on the aluminum liquid filling.

5. A low-pressure casting mold suitable for large riser wheel hubs according to claim 1, characterized in that: The mold also includes a top mold (20), the flange area of ​​which is provided with a concave structure (21), the concave structure (21) is provided with a corresponding convex structure (11) on the bottom mold (10), so that the riser area of ​​the wheel hub blank (30) has a stepped shape.

6. A low-pressure casting mold suitable for large riser wheel hubs according to claim 5, characterized in that: The depth of the concave structure (21) is such that the cavity thickness in the mold flange area is 35-45mm.

7. A low-pressure casting mold suitable for large riser wheel hubs according to claim 5, characterized in that: The top mold (20) has a weight-reducing protrusion (22) on its front side, and the weight-reducing protrusion (22) is misaligned with the bolt column (13) of the bottom mold (10).

8. A low-pressure casting mold suitable for large riser wheel hubs according to claim 5, characterized in that: The top mold (20) is also provided with a weight-reducing truncated cone (23) on its front side, and the weight-reducing truncated cone is provided with a bolt column (13) corresponding to the bottom mold (10).

Images