LIQUID-COOLING COLD PLATE AND METHOD FOR MANUFACTURING SAME

• US 20180078997A1
• Filed: 02/22/2016
• Published: 03/22/2018
• Est. Priority Date: 04/13/2015
• Status: Active Grant

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Inventors: UJIIE, Satoru, DAIKOKU, Takahiro
• Granted Patent: US 10,532,401 B2
• Time in Patent Office: Days
• CPC Class Codes: B22D 19/0072 for making objects with integrated channels
• CPC Class Codes: F28D 1/0383 with U-flow or serpentine-flow inside the conduits
• CPC Class Codes: F28D 1/0475 the conduits having a single U-bend
• CPC Class Codes: F28D 1/0476 the conduits having a non-circular cross-section
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 1/006 with variable shape, e.g. with modified tube ends, with different geometrical features F28F1/025, F28F1/06, F28F1/08, F28F9/16, F28F9/18 take precedence
• CPC Class Codes: F28F 1/16 the means being integral with the element, e.g. formed by extrusion F28F1/22 takes precedence
• CPC Class Codes: F28F 13/08 by varying the cross-section of the flow channels
• CPC Class Codes: F28F 2240/00 Spacing means
• CPC Class Codes: F28F 2255/146 overmolded
• CPC Class Codes: F28F 3/12 Elements constructed in the shape of a hollow panel, e.g. with channels F28D1/02, F28D1/03 take precedence
• CPC Class Codes: F28F 9/0131 formed by plates F28F9/0138 takes precedence
• CPC Class Codes: F28F 9/0258 of quick acting type, e.g. with snap action
• CPC Class Codes: H01L 21/4871 Bases, plates or heatsinks
• CPC Class Codes: H01L 23/473 by flowing liquids H01L23/4332, H01L23/4338 take precedence
• CPC Class Codes: H05K 7/20254 Cold plates transferring heat from heat source to coolant

Abstract

In a method of manufacturing a liquid-cooling cold plate, cast molding is performed after embedding a metal pipe for supplying a cooling liquid inside a casting mold. Fixing brackets to be attached to the metal pipe is provided to maintain a positional relationship between a plurality of portions of the metal pipe embedded in the casting mold. The casting molding is performed by pouring molten metal into the casting mold while the fixing metal parts are attached to the metal pipe.

Claims

1. A method of manufacturing a liquid-cooling cold plate, in which cast molding is performed after embedding a metal pipe for supplying a cooling liquid in a casting mold, the method comprising:

providing fixing brackets to be attached to the metal pipe to maintain a positioning accuracy between a plurality of portions of the metal pipe embedded in the casting mold; and

performing cast molding by pouring molten metal into the casting mold while attaching the fixing brackets to the metal pipe.

2. The method of claim 1, wherein the cast molding is performed by pouring the molten metal into the casting mold in a state where positioning is realized by fitting the fixing brackets or protrusions formed at the fixing brackets to recesses formed at the casting mold.

3. The method of claim 2, wherein protrusions of the fixing brackets with respect to the cast-molded liquid-cooling cold plate are planarized by milling.

4. The method of claim 1, wherein the cast molding is performed by pouring the metal molten into the casting mold in a state where positioning is realized by fitting protrusions formed at the casting mold to recesses formed at the fixing brackets.

7. The method of claim 1, further comprising:

providing another fixing bracket to be attached to an inlet and an outlet of the metal pipe to maintain positional relationship between the inlet and the outlet of the metal pipe which protrude from a liquid-cooling cold plate main body; and

performing cast molding by pouring molten metal into the casting mold in a state where positioning is realized by attaching the another fixing bracket to the inlet and the outlet of the metal pipe and fitting the another fixing bracket to the casting mold.

9. The method of claim 1, wherein at least a part of the metal pipe is planarized.

11. The method of claim 1, wherein a curved connection portion of the metal pipe positioned opposite to an inlet and an outlet of the metal pipe which protrude from a liquid-cooling cold plate main body protrudes from the liquid-cooling cold plate main body.

5. A method of manufacturing a liquid-cooling cold plate, in which cast molding is performed after embedding a metal pipe for supplying a cooling liquid in a casting mold, the method comprising:

providing a pipe pressing portion for pressing and fixing the metal pipe at the casting mold, and

performing casting molding by pouring molten metal into the casting mold while pressing and fixing the metal pipe by the pipe pressing portion.

6. The method of claim 5, further comprising:

providing a fixing bracket to be attached to the metal pipe to maintain positional relationship between a plurality of portions of the metal pipe embedded in the casting mold; and

performing cast molding by pouring molten metal into the casting mold while attaching the fixing brackets to the metal pipe.

8. The method of claim 5, further comprising:

providing another second fixing bracket to be attached to an inlet and an outlet of the metal pipe to maintain positional relationship between the inlet and the outlet of the metal pipe which protrude from a liquid-cooling cold plate main body; and

performing cast molding by pouring molten metal into the casting mold in a state where positioning is realized by attaching the another fixing bracket to the inlet and the outlet of the metal pipe and fitting the another fixing bracket to the casting mold.

10. The method of claim 5, wherein at least a part of the metal pipe is planarized.

12. The method of claim 5, wherein a curved connection portion of the metal pipe positioned opposite to an inlet and an outlet of the metal pipe which protrude from a liquid-cooling cold plate main body protrudes from the liquid-cooling cold plate main body.

13. A liquid-cooling cold plate comprising:

a metal pipe configured to supply cooling liquid; and

a cold plate main body having the metal pipe therein,

wherein a fixing bracket to be attached to the metal pipe is provided to maintain position relationship between a plurality of portions of the metal pipe embedded in the cold plate main body, and

the fixing bracket is integrated with the cold plate main body by performing cast molding while the fixing bracket is attached to the metal pipe.

14. The liquid-cooling cold plate of claim 13, wherein an inlet and an outlet of the metal pipe and a curved connection portion of the metal pipe positioned opposite to the inlet and the outlet of the metal pipe protrude from the cold plate main body.

15. The liquid-cooling cold plate of claim 14, wherein at least a part of the metal pipe is planarized.