Vacuum centrifugal casting apparatus

Patent metadata

Field	Value
Publication number	US-10814381-B2
Application number	US-201816181852-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Dec 15, 2017
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A vacuum centrifugal casting apparatus includes an upper mold having an upper vacuum hole communicating with both a cavity and a space over the upper mold, a lower mold including a lower vacuum hole corresponding to the upper vacuum hole, the lower vacuum hole communicating with both the cavity and a space under the lower mold, a motor configured to rotate the upper mold and the lower mold, a vacuum retaining member having an outer diameter corresponding to the upper vacuum hole, with a molten metal injection hole formed in an upper end of the vacuum retaining member, and a vacuum pump configured to be operated by the motor, and including an inlet communicating with the lower vacuum hole, and an outlet formed to exhaust drawn air.

First claim

What is claimed is:

1. A vacuum centrifugal casting apparatus, comprising:
an upper mold including an upper vacuum hole communicating with both a cavity and a space over the upper mold;
a lower mold including a lower vacuum hole corresponding to the upper vacuum hole, the lower vacuum hole communicating with both the cavity and a space under the lower mold;
a motor configured to rotate the upper mold and the lower mold;
a vacuum retaining member having an outer diameter corresponding to the upper vacuum hole, with a molten metal injection hole formed in an upper end of the vacuum retaining member; and
a vacuum pump configured to be operated by the motor, and including an inlet communicating with the lower vacuum hole, and an outlet formed to exhaust drawn air.

2. The vacuum centrifugal casting apparatus of claim 1 , wherein the vacuum retaining member includes:
an internal space formed in a body forming an outer shape of the vacuum retaining member so that molten metal is injected into the internal space through the molten metal injection hole;
a molten metal filling hole formed in a first lateral direction in a medial portion of the body; and
a gas exhaust hole formed in a second lateral direction in a lower end of the body.

3. The vacuum centrifugal casting apparatus of claim 2 , further comprising a retaining-member fixing unit configured to fix the vacuum retaining member at a height at which the gas exhaust hole of the vacuum retaining member communicates with the cavity.

4. The vacuum centrifugal casting apparatus of claim 3 ,
wherein a fixing-member receiving hole is formed in the upper mold, and
wherein the retaining-member fixing unit comprises:
a fixing member disposed in the fixing-member receiving hole and configured to allow a protruding one end of the fixing member to be inserted into a fixing depression formed in the vacuum retaining member; and
a spring configured to elastically couple the fixing member to the fixing-member receiving hole.

5. The vacuum centrifugal casting apparatus of claim 4 , wherein the vacuum retaining member moves downward as the spring is contracted by centrifugal force generated by rotation of the upper mold and the lower mold.

6. The vacuum centrifugal casting apparatus of claim 5 , wherein the vacuum retaining member moves downward when the upper mold and the lower mold rotate at a rotation speed greater than or equal to a casting RPM.

7. The vacuum centrifugal casting apparatus of claim 3 , wherein the vacuum retaining member moves downward when the vacuum retaining member is released from the retaining-member fixing unit, and a stopper configured to set a downwardly moved position of the vacuum retaining member is formed in the lower mold.

8. The vacuum centrifugal casting apparatus of claim 7 , wherein the vacuum retaining member is moved downward and disposed at a height at which the molten metal filling hole communicates with the cavity.

9. The vacuum centrifugal casting apparatus of claim 3 ,
wherein a pair of rod insert holes are formed in the lower mold, and
wherein the retaining-member fixing unit comprises:
a pair of sliding rods respectively disposed in the rod insert holes and configured to operate in a sliding manner;
a pair of springs configured to elastically couple the pair of sliding rods to the rod insert holes, respectively; and
a pair of rotating rods rotatably coupled to respective of the sliding rods,
wherein the pair of rotating rods intersect with each other and are coupled to the lower end of the vacuum retaining member.

10. The vacuum centrifugal casting apparatus of claim 9 , wherein the vacuum retaining member moves downward as the springs are contracted by centrifugal force generated by rotation of the upper mold and the lower mold.

11. The vacuum centrifugal casting apparatus of claim 10 , wherein the vacuum retaining member moves downward when the upper mold and the lower mold rotate at a rotation speed greater than or equal to a casting RPM.

12. The vacuum centrifugal casting apparatus of claim 11 , wherein the vacuum retaining member is moved downward and disposed at a height at which the molten metal filling hole communicates with the cavity.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Jo Young-Rae
• Joo Hyo-Moon
• Kim Min-Soo
• Kang Mun-Gu

Classifications

• B22D13/107

  Means for feeding molten metal · CPC title

• B22D13/101 Primary

  Moulds · CPC title

• B22D27/15

  by using vacuum · CPC title

• B22C9/067

  Venting means for moulds · CPC title