Casting mold for metal sheet

Patent metadata

Field	Value
Publication number	US-10675674-B2
Application number	US-201716064693-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Jun 13, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The present invention relates to a casting mold for a metal sheet by drawing molten metal into a mold cavity and cooling the molten metal, and the casting mold according to the present invention includes: a support portion at an upper side on which molten metal is disposed or a solid metal is placed and melted; a mold cavity at a lower side in which the metal sheet is formed as the molten metal is drawn from the support portion while filling the mold cavity and cooled; and a passageway through which the molten metal is drawn into the mold cavity from the support portion, in which the mold cavity includes a first surface at the upper side which communicates with the passageway, and a second surface at the lower side which faces the first surface, a plurality of suction portions for drawing the molten metal are formed in the second surface and extended downward from the second surface, the suction portions are connected to a vacuum source and configured to draw the molten metal by suctioning air from the mold cavity, and a blocking member, which is in contact with the second surface or the suction portions to prevent a leakage of the molten metal and allow an air flow, is disposed on the suction portions in the mold cavity.

First claim

The invention claimed is:

1. A casting mold for a metal sheet by drawing molten metal into a mold cavity and cooling the molten metal, the casting mold comprising:
a support portion at an upper side on which molten metal is disposed or a solid metal is placed and melted;
a mold cavity at a lower side in which the metal sheet is formed as the molten metal is drawn from the support portion while filling the mold cavity and cooled; and
a passageway through which the molten metal is drawn into the mold cavity from the support portion,
wherein the mold cavity includes a first surface which communicates with the passageway, and a second surface which faces the first surface wherein the first surface is closer to the upper side than the second surface, a plurality of suction portions for drawing the molten metal are formed in the second surface and extended downward from the second surface, the suction portions are connected to a vacuum source and configured to draw the molten metal by suctioning air from the mold cavity, and a blocking member, which is in contact with the second surface or the suction portions to prevent a leakage of the molten metal and allow an air flow, is disposed on the suction portions in the mold cavity.

2. The casting mold of claim 1 , comprising:
an upper mold which has therein the passageway through which the molten metal is drawn into the mold cavity, and has the support portion at the upper side thereof; and
a lower mold which is provided at the lower side of the upper mold and defines the mold cavity between the upper mold and the lower mold,
wherein a surface, which defines the first surface of the mold cavity, is formed at the lower side of the upper mold, and a surface, which defines the second surface of the mold cavity, is formed at the upper side of the lower mold.

3. The casting mold of claim 2 , wherein a protruding portion, which protrudes toward the mold cavity and is in contact with a portion of the second surface of the mold cavity where the suction portions are formed, is provided at the lower side of the upper mold, and the protruding portion defines the blocking member.

4. The casting mold of claim 3 , wherein an outer circumferential surface of the protruding portion is in contact with a circumferential surface between the first surface and the second surface of the mold cavity, and an inner circumferential surface of the protruding portion, together with the first surface and the second surface of the mold cavity, defines a space corresponding to a shape of the metal sheet.

5. The casting mold of claim 1 , wherein a thermal insulator or a thermal insulation coating is provided in the passageway.

6. The casting mold of claim 1 , wherein a common space, which communicates with the vacuum source, is provided at the lower side of the suction portions.

7. The casting mold of claim 1 , further comprising:
a coolant passageway which is formed to cool the casting mold.

8. The casting mold of claim 1 , wherein the suction portion is formed in the second surface of the mold cavity so as to be adjacent to a circumferential surface between the first surface and the second surface of the mold cavity, and the blocking member has surfaces which are in contact with the first surface, the second surface, and the circumferential surface of the mold cavity.

9. The casting mold of claim 8 , wherein the blocking member is configured by a ring disposed in the mold cavity, and the ring is disposed on the upper side of the suction portion and is in contact with the circumferential surface of the mold cavity, a part of the first surface adjacent to the circumferential surface, and a part of the second surface adjacent to the circumferential surface.

10. The casting mold of claim 9 , wherein an inner surface of the ring, together with the first surface and the second surface of the mold cavity, defines a space corresponding to a shape of the metal sheet.

11. The casting mold of claim 1 , wherein a surface of the blocking member, which is in contact with the second surface of the mold cavity, has surface roughness that allows an air flow from the mold cavity to the suction portion.

12. The casting mold of claim 1 , wherein a plurality of the support portions and a plurality of the passageways are formed, the molten metal, which is introduced into the mold cavity from the respective passageways, forms flows of the molten metal toward the adjacent suction portions, and the suction portions are disposed between the passageways on a plane of the mold cavity so that the flows of the molten metal are contact with the flows of the molten metal from the adjacent passageways.

13. The casting mold of claim 12 , wherein the suction portion is concavely formed downward from the second surface of the mold cavity, a suction hole, which communicates with the vacuum source, is formed in a bottom surface of the suction portion, the blocking member is formed in a shape complementary to the suction portion, an upper surface of the blocking member is placed on the suction portion so as to define a part of the second surface of the mold cavity, and an air flow passageway from the mold cavity to the suction hole is formed between the blocking member and the suction portion.

14. The casting mold of claim 13 , wherein any one of a surface of the blocking member and a surface of the suction portion, which are in contact with each other, has surface roughness that allows an air flow from the mold cavity to the suction hole.

15. The casting mold of claim 12 , wherein the respective suction portions are disposed to be spaced apart from the passageways on a plane of the mold cavity, and the respective suction portions are disposed at equal distances from the adjacent passageways.

16. The casting mold of claim 12 , wherein any one of a surface of the blocking member and a surface of the suction portion, which are in contact with each other, has surface roughness that allows an air flow from the mold cavity to the suction hole.

Assignees

• Korea Inst Mach & Materials

Inventors

• Lim Ka Ram
• Na Young Sang

Classifications

• B22D18/06

  Vacuum casting, i.e. making use of vacuum to fill the mould · CPC title

• B22C9/061 Primary

  Materials which make up the mould · CPC title

• B22D11/055

  Cooling the moulds {(B22D11/04 takes precedence)} · CPC title

• B22D27/15

  by using vacuum · CPC title

• B22C9/12

  Treating moulds or cores, e.g. drying, hardening · CPC title