Multiple pressure casting mold and molded product manufacturing method using same

Patent metadata

Field	Value
Publication number	US-10005124-B2
Application number	US-201515116981-A
Country	US
Kind code	B2
Filing date	Feb 6, 2015
Priority date	Feb 7, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A multiple pressure casting mold includes a mold part having upper and lower molds, each having molten metal injection ports and the molded product accommodating parts for accommodating the molten metal for the molded product, a rotating unit for rotating the mold part so as to allow the molten metal injected through the molten metal injection ports to flow into the molded product accommodating parts, and a molten metal injection control unit having upper and lower pressing parts for pressing the molten metal injected through the molten metal injection ports so as to allow the molten metal to flow into the molded product accommodating parts with the rotating unit.

First claim

What is claimed is:

1. A multiple pressure casting mold comprising:
a mold part including
upper and lower molds, each having molten metal injection ports and molded product accommodating parts for accommodating molten metal for a molded product;

a rotary unit including
a rotary body supporting the mold part on a bottom side of the mold part and configured to rotate the mold part so as to allow the molten metal injected through the molten metal injection ports to flow into the molded product accommodating parts; and

a molten metal injection control unit for pressurizing the molten metal injected through the molten metal injection ports so as to allow the molten metal to flow into the molded product accommodating parts, together with the rotary unit, the molten metal injection control unit including
a sub-frame disposed on and extending upward from the upper mold,
upper and lower pressurizing cylinders, and
upper and lower pressurizing parts,
wherein the upper pressurizing cylinder is fixedly attached to the sub-frame such that the upper pressurizing cylinder rotates along with the upper mold, and
the lower pressurizing cylinder is fixedly attached to the rotary body of the rotary unit such that the lower pressurizing cylinder rotates along with the rotary body, and
wherein the upper pressurizing part is attached to a cylinder rod of the upper pressurizing cylinder, and
the lower pressurizing part is attached to a cylinder rod of the lower second pressurizing cylinder.

2. The multiple pressure casting mold according to claim 1 , wherein the upper and lower pressurizing parts of the molten metal injection control unit are configured to move up and down in the molten metal injection ports, respectively, so as to connect or disconnect the molten metal injection ports and the molded product accommodating parts.

3. The multiple pressure casting mold according to claim 1 , wherein the upper and lower pressurizing parts of the molten metal injection control unit are configured to move up and down in the molten metal injection ports, respectively, so as to open or close a riser between the molten metal injection ports and the molded product accommodating parts.

4. The multiple pressure casting mold according to claim 1 , wherein the mold part further includes a sleeve attached to the molten metal injection ports and through which the molten metal is able to be injected, wherein the sleeve is provided with an electromagnetic field transmission part through which an electromagnetic field is transmitted.

5. The multiple pressure casting mold according to claim 4 , wherein the sleeve is formed from an electromagnetic field-shielding material having a hollow cylindrical shape whose upper and lower parts are opened, wherein the electromagnetic field transmission part is provided with a plurality of holes perforated at regular intervals along the sleeve, and a plurality of filler parts formed from an electromagnetic field transmitting material and filling the plurality of holes.

6. The multiple pressure casting mold according to claim 4 , wherein the sleeve is made from any one of SKD61 and STD61, and the filler parts are formed from silicone.

7. The multiple pressure casting mold according to claim 4 , wherein an electromagnet module is disposed around the sleeve.

8. The multiple pressure casting mold according to claim 1 , wherein the molten metal injection ports include first and second molten metal injection ports passing along a central rotary axis of the upper and lower molds, respectively, wherein the upper mold is provided, on a bottom surface thereof, with one or more first casting grooves and one or more first molten metal distribution passages respectively connecting the first casting grooves and the first molten metal injection port, wherein the lower mold is provided, on a top surface thereof, with one or more second casting grooves and one or more second molten metal distribution passages respectively connecting the second casting grooves and the second molten metal injection port, such that the first and second casting grooves and the first and second molten metal distribution passages are respectively formed to correspond to each other, and wherein, when the upper and lower molds are engaged, the first and second casting grooves facing each other form the molded product accommodating parts, and the first and second molten metal distribution passages facing each other form risers.

9. The multiple pressure casting mold according to claim 8 , wherein first and second inner cores are respectively attached to the first and second casting grooves.

10. The multiple pressure casting mold according to claim 1 , wherein the upper and lower pressurizing parts are disposed such that the upper and lower pressurizing parts are able to move in and out of the first and second molten metal injection ports along a central rotary axis of the upper and lower molds without interfering with rotation of the rotary unit.

11. A molded product manufacturing method using the multiple pressure casting mold according to claim 1 , the method comprising:
engaging the upper and lower molds such that first and second casting grooves face each other to form the molded product accommodating parts and first and second molten metal distribution passages face each other to form risers, wherein the risers connect the molten metal injection ports and the molded product accommodating parts;
moving up the lower pressurizing part in the molten metal injection ports such that the lower pressurizing part closes off the risers from the molten metal injection ports;
injecting the molten metal into the molten metal injection ports;
moving down the upper pressurizing part in the molten metal injection ports while rotating the mold part such that with the lower pressurizing part being moved down, the molten metal is introduced into the molded product accommodating parts through the risers; and
after the molten metal is solidified in the molded product accommodating parts, disengaging the upper mold from the lower mold.

12. The molded product manufacturing method according to claim 11 , wherein when moving down the upper pressurizing part in the molten metal injection ports, a bottom surface of the upper pressurizing part coincides with a surface of the molten metal.

13. The molded product manufacturing method according to claim 11 , wherein when moving down the upper pressurizing part in the molten metal injection, the lower pressurizing part is moved down until a top surface of the lower pressurizing part coincides with a position corresponding to a bottom edge of the risers.

14. The molded product manufacturing method according to claim 13 , wherein when the top surface of the lower pressurizing part coincides with the bottom edge of the risers, the lower and upper pressurizing parts pressurize the molten metal at the same pressure.

15. A molded product manufacturing method using the multiple pressure casting mold according to claim 1 , the method comprising:
engaging the upper and lower molds such that first and second casting grooves face each other to form the molded product accommodating parts and first and second molten metal distribution passages face each other to form risers, wherein the risers connect the molten metal injection ports and the molded product accommodating parts;
moving down the lower pressurizing part in the molten metal injection ports such that a top surface of the lower pressurizing part is positioned below a bottom edge of the risers;
injecting the molten metal into the molten metal injection ports such that the molten meta

Assignees

• Korea Inst Ind Tech

Inventors

• Lee Young Cheol
• Kim Jeong Tae

Classifications

• B22D13/06 Primary

  of solid or hollow bodies in moulds rotating around an axis arranged outside the mould · CPC title

• B22D13/107

  Means for feeding molten metal · CPC title