Claims
- 1. A method for forming elongated holes in a header of a heat exchanger by a process comprising:
- inserting a core bar into the header;
- pressing a portion of the outer wall of the header with a pressing punch to form a depressed, elongated area having tapered edges on the header;
- removing the core bar from the header; and
- forming elongated holes by removing the center portion of the depressed elongated area with a cutting punch.
- 2. A method for manufacturing a heat exchanger having a first header connected to a second header by a plurality of flattened oval heat exchange tubes, said method comprising:
- forming a plurality of elongated holes on each of said headers by a pressing process comprising for each
- (a) inserting a core bar into one of said headers,
- (b) pressing a plurality of tapered depressions into one surface of said header;
- (c) removing said core bar from said header; and
- (d) punching out the central portion of the tapered depressions to form elongated holes surrounded by an annular depression;
- connecting the headers by inserting heat exchange tubes into elongated holes in the first header and the second header; and
- sealing the connections between the headers and the tubes and filling in the annular depressions around each tube with a sealing material.
- 3. A method according to claim 2 wherein the sealing step comprises soldering or brazing.
- 4. A method according to claim 2 wherein the forming step is on headers that are regular, right cylinders.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-115039[U] |
Sep 1988 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 402,696, filed Sept. 5, 1989, abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0167039 |
Oct 1983 |
JPX |
807608 |
Jan 1959 |
GBX |
0944094 |
Dec 1963 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
402696 |
Sep 1989 |
|