MOLD FOR REDUCING DEFECTS IN LOW PRESSURE CASTING OF ALUMINUM ALLOY WHEEL

• US 20190321878A1
• Filed: 03/22/2019
• Published: 10/24/2019
• Est. Priority Date: 03/23/2018
• Status: Active Grant

• Current Assignee: Citic Dicastal Co. Ltd (CITIC Corp. Ltd.)
• Original Assignee: Citic Dicastal Co. Ltd (CITIC Corp. Ltd.)
• Inventors: Wang, Kaiqing, Xu, Xianyi, Li, Changhai
• Granted Patent: US 10,654,099 B2
• Time in Patent Office: Days
• CPC Class Codes: B22C 9/28 for wheels, rolls, or rollers B22D15/005 takes precedence
• CPC Class Codes: B22D 18/04 Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Abstract

A mold for reducing defects in low pressure casting of an aluminum alloy wheel includes a top mold, a side mold and a bottom mold, wherein the top mold is arranged above the bottom mold to mold a back cavity of a wheel, the bottom mold is arranged below the top mold to mold a front wheel disc of the wheel, the side mold is arranged on the side of the top mold and the bottom mold, and the top mold, the side mold and the bottom mold collectively surround a casting cavity of the aluminum alloy wheel, wherein the upper surface of the bottom mold includes a recessed portion configured to form a spoke and a boss portion configured to form a window and wherein the boss portion configured to form the window includes cooling ducts.

Claims

1. A mold for reducing defects in low pressure casting of an aluminum alloy wheel, the mold comprising:

a top mold, a side mold and a bottom mold, the top mold being arranged above the bottom mold and configured to mold a back cavity of a wheel, the bottom mold being arranged below the top mold and configured to mold a front wheel disc of the wheel, the side mold being arranged a the side of the top mold and the bottom mold, and the top mold, the side mold and the bottom mold collectively surrounding a casting cavity of the aluminum alloy wheel, wherein an upper surface of the bottom mold includes a recessed portion configured to form a spoke and a boss portion configured to form a window, the top mold having a depth such that a hub cavity is 1 mm to 2 mm higher than a predetermined hub blank;

a portion of the top mold configured to cooperate with the boss portion of the upper surface of the bottom mold and configured to form the window that includes an assembly slot, the assembly slot is expanded by 2 mm to 3 mm based on the boss portion, and a clearance of 0.2 mm to 0.5 mm is formed between a top surface of the assembly slot and the boss portion, and wherein the boss portion configured to form the window comprises cooling ducts.

2. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 1, wherein a back surface of the bottom mold includes a rotator cavity formed by turning, and wherein a wall thickness of the bottom mold is between 20 mm and 25 mm.

3. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 1, wherein the cooling ducts include round holes penetrating the bottom mold.

4. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 3, wherein the round holes have a diameter of between 3 mm and 5 mm and are spaced apart from each other by 3 mm to 6 mm.

5. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 3, wherein the round holes have the diameter of 4 mm and are spaced apart from each other by 4 mm.

6. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 3, wherein exhaust pipes are welded to two ends of the round holes.

7. The mold for reducing defects in low pressure casting of an aluminum alloy wheel according to claim 1, wherein the boss portion for forming the window does not have round holes within 5 mm of an edge.