An adjustable sealing and exhaust structure for a core positioning head

Abstract

The present invention relates to an adjustable sealed exhaust structure for a core positioning head, which includes a core head with a spherical head having an arc surface, an exhaust swing ball head that fits with the outer surface of the core head, and a limiting device for adjusting the pitching angle of the exhaust swing ball head. The bottom of the exhaust swing ball head is an inwardly concave swing sealing arc surface that fits with the outer surface of the core head. The top of the swing sealing arc surface communicates with an exhaust passage, and there is an exhaust plug in the exhaust passage. The side bottom of the exhaust swing ball head is a swing ball arc surface, and the swing ball arc surface is in close contact with a bearing arc surface provided inside the mold body. The upper part of the exhaust swing ball head has a limiting step and an exhaust passage. The present invention can adjust the sealing contact of the core positioning head, reduce the influence of expansion error, improve the exhaust smoothness, and avoid the molten aluminum covering the core and preventing exhaust.

Description

Technical Field

[0001] The present invention relates to a low-pressure gravity casting core exhaust structure, belonging to the technical field of low-pressure and gravity casting molds for aluminum alloys. Background Art

[0002] Most of the existing core positioning platforms are conical positioning bosses (such as Figure 1 ), the upper surface is a plane, and exhaust is carried out through an exhaust channel and an exhaust plug. In this structure, it is difficult to accurately calculate the expansion coefficients of the mold and the core during casting, resulting in positioning errors between the core positioning head of the mold and the core positioning head, the sealing performance cannot be guaranteed, the structure is not easy to adjust, so that the molten aluminum penetrates into the exhaust plug and blocks the exhaust, causing gas entrapment defects in the casting. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above deficiencies and provide a core positioning head adjustable sealing exhaust structure, which can adjust the sealing contact of the core positioning head, reduce the influence of expansion errors, and improve the exhaust smoothness.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A core positioning head adjustable sealing exhaust structure includes a core head with an arc-shaped ball head, an exhaust swing ball head that fits with the outer surface of the core head, and a limiting device for adjusting the pitching angle of the exhaust swing ball head. The bottom of the exhaust swing ball head is an inwardly concave swing sealing arc surface that fits with the outer surface of the core head. The top of the swing sealing arc surface communicates with the exhaust channel, and there is an exhaust plug in the exhaust channel. The side bottom of the exhaust swing ball head is a swing ball arc surface, and the swing ball arc surface is in close contact with the bearing arc surface provided in the mold body. The upper part of the exhaust swing ball head has a limiting step and an exhaust channel.

[0006] There is a swing gap at the non-tangential part between the swing sealing arc surface and the core head. The swing gap is filled with an infiltrated graphite medium.

[0007] The limiting device includes a pressing plate, a fixing screw, and a swing adjusting screw. The pressing plate is fixed to the mold body by the fixing screw, and one end of the swing adjusting screw abuts against the limiting step of the exhaust swing ball head and the other end is fixed to the pressing plate.

[0008] The limiting step is preferably formed by combining a plurality of truncated cones with different diameters.

[0009] There is a cooling water channel in the exhaust swing ball head.

[0010] The core head is the main exhaust part of the core. The mold body bears the exhaust swing ball head. The pressing plate is used to fix the swing adjusting screw. The swing adjusting screw is used to adjust the pitching angle of the exhaust swing ball head. The exhaust plug is made of powder metallurgy material to prevent blockage.

[0011] The swinging seal arc surface maintains sealed contact with the spherical head of the arc surface of the core head at various angles, and the swinging gap provides the swinging gap for the exhaust swinging ball head. The exhaust swinging ball head includes a cooling water channel, an exhaust channel, etc. The cooling water channel cools the molten aluminum by cooling the exhaust swinging ball head and infiltrating the graphite medium, preventing the molten aluminum from entering the exhaust plug. The infiltrated graphite medium can ensure the smooth adjustment of the exhaust swinging ball head and avoid the adhesion of molten aluminum on the swinging seal spherical surface.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The exhaust adopts a floating adjustable structure, which can adjust the pitching structure of the exhaust swinging ball head and can be in close contact with the core head, reducing the influence of expansion error;

[0014] 2. The top of the core head is designed as a spherical head with an arc surface to adapt to multi-angle sealed exhaust;

[0015] 3. The graphite infiltration technology is adopted to ensure the smooth adjustment and sliding of the floating exhaust swinging ball head.

[0016] The present invention can avoid the molten aluminum from wrapping the core and preventing exhaust. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the existing core exhaust structure;

[0018] Figure 2 It is a structural diagram of the adjustable sealed exhaust of the core positioning head of the present invention;

[0019] Figure 3 It is a three-dimensional structural diagram of the exhaust swinging ball head of the present invention;

[0020] Figure 4 It is a sectional view of the exhaust swinging ball head of the present invention;

[0021] Figure 5 It is a schematic diagram of the application of the present invention in the production of new energy battery box castings;

[0022] Among them, 1. Core head, 2. Exhaust swinging ball head, 3. Swinging seal arc surface, 4. Exhaust channel, 5. Exhaust plug, 6. Swinging ball arc surface, 7. Limit step, 8. Swinging gap, 9. Pressure plate, 10. Fixed screw, 11. Swinging adjustment screw, 12. Mold body, 13. Cooling water channel, 14. Upper mold, 15. Lower mold, 16. Inner cavity core, 17. Water channel core, 18. Molten aluminum lifting port, 19. Sprue, 20. Aluminum casting electric box body, 21. Core positioning table. Detailed Embodiments

[0023] The following is further described in conjunction with the drawings and specific embodiments.

[0024] Embodiment

[0025] A core positioning head adjustable sealing and exhaust structure includes a core head 1 with an arc-shaped ball head, an exhaust swing ball head 2 that fits with the outer surface of the core head 1, and a limiting device for adjusting the pitching angle of the exhaust swing ball head 2. The bottom of the exhaust swing ball head 2 is an inwardly concave swing sealing arc surface 3 that fits with the outer surface of the core head. The top of the swing sealing arc surface 3 is connected to an exhaust passage 4, and there is an exhaust plug 5 in the exhaust passage 4. The side bottom of the exhaust swing ball head 2 is a swing ball arc surface 6, and the swing ball arc surface 6 is in close contact with a bearing arc surface provided in the mold body 12. The upper part of the exhaust swing ball head 2 has a limiting step 7 and an exhaust passage 4.

[0026] The limiting device includes a pressure plate 9, a fixing screw 10, and a swing adjustment screw 11. The pressure plate 9 is fixed to the mold body 12 through the fixing screw 10. One end of the swing adjustment screw 11 abuts against the limiting step 7 of the exhaust swing ball head, and the other end is fixed to the pressure plate 9.

[0027] There is a swing gap between the swing sealing arc surface and the core head, and the swing gap is filled with an infiltrated graphite medium. The limiting step 7 is formed by combining two frustums of different diameters, and there is a cooling water channel 13 in the exhaust swing ball head.

[0028] The core positioning head adjustable sealing and exhaust structure of the present invention is applied to a mold for producing a new energy electric box body:

[0029] As Figure 5 shown, the mold is divided into an upper mold 14 and a lower mold 15. The core positioning table 21 refers to the positioning part of the core on the lower mold, and the positioning head (core head 1) refers to the positioning part of the core on the upper mold. Before production, check whether the exhaust plugs at all parts of the mold are intact and unobstructed. Adjust the pitching angle of the exhaust swing ball head through the swing adjustment screw. After checking and finding no problems, heat up the mold and put it on the machine. After confirming that there are no problems with the upper and lower molds being closed, open the mold and put in the cores (inner cavity core 16, water channel core 17). After closing the mold, the molten aluminum enters the mold cavity from the molten aluminum lifting port 18. The high-temperature burning of the core generates gas, and the gas is discharged from the mold cavity through the exhaust plug exhaust passage; the excess molten aluminum enters the pouring channel 19, and finally an aluminum casting electric box body 20 is prepared.

[0030] The above is a detailed introduction of the invention in combination with specific embodiments, and the protection scope of the present invention is not limited thereto.

Claims

1. An adjustable sealed exhaust structure for a core positioning head, characterized in that, it includes a core head with an arc-shaped ball head, an exhaust swing ball head that fits with the outer surface of the core head, and a limiting device for adjusting the pitching angle of the exhaust swing ball head. The bottom of the exhaust swing ball head is an inwardly concave swing sealing arc surface that fits with the outer surface of the core head. The top of the swing sealing arc surface communicates with the exhaust passage. There is an exhaust plug in the exhaust passage. The side bottom of the exhaust swing ball head is a swing ball arc surface, and the swing ball arc surface is in close contact with the bearing arc surface provided in the mold body. There are limiting steps and an exhaust passage in the upper part of the exhaust swing ball head; there is a swing gap at the non-tangent place between the swing sealing arc surface and the core head; there is a cooling water channel in the exhaust swing ball head.

2. The adjustable sealed exhaust structure for a core positioning head according to claim 1, characterized in that, the swing gap is filled with an infiltrated graphite medium.

3. The adjustable sealed exhaust structure for a core positioning head according to claim 1, characterized in that, the limiting device includes a pressing plate, a fixing screw and a swing adjusting screw. The pressing plate is fixed on the mold body through the fixing screw. One end of the swing adjusting screw abuts against the limiting step of the exhaust swing ball head and the other end is fixed on the pressing plate.

4. The adjustable sealed exhaust structure for a core positioning head according to claim 1, characterized in that, the limiting step is formed by a combination of frustums of different diameters.

Images