Showa Denko K.k.

Showa Aluminum Corporation

Satoru Kaimura

Takashi Tamura

Ryoichi Hoshino

Yasuji Kawamata

Noboru Ogasawara

Yuji Yamamoto

Shinji Ito

Hirosaburo Hirano

Masashi Sakaguchi

Satoshi Hozumi

Yoshihiro Saito

A metal plate for producing a flat tube including a metal body having a joint portion, first and second flat wall forming portions connected by the joint portion, reinforcing wall forming portions projecting from the first and second flat wall forming portions and extending in a longitudinal direction of the first and second flat wall forming portions, and side wall forming portions projecting from opposite side edges of the metal body, respectively. The joint portion has a ridge which makes the joint portion thicker than the first and second flat wall forming portions. The ridge, the reinforcing wall forming portions and the side wall forming portions are projecting in a same direction. The metal body bends into a hairpin shape at boundaries formed between the ridge of the joint portion and the first and second flat wall forming portions.

Metal plate for producing flat tube, flat tube and process for producing the flat tube

A rolling apparatus including a first work roll and a second work roll cooperative with the first work roll for rolling a metal blank plate to manufacture a metal product of miscellaneous cross section including a plate portion having one side in the form of a flat surface and a plurality of ridges projecting upright from the other side of the plate portion integrally therewith and spaced from one another. The first work roll has a plurality of ridge forming annular grooves formed in the peripheral surface thereof over the entire circumference of the surface and arranged at a spacing axially of the first work roll. The two work rolls are rotated so that the peripheral speed of the bottom face of the deepest of all the ridge forming annular grooves in the first work roll is not less than the peripheral speed of the peripheral surface of the second work roll.

Rolling apparatus and method of making product of miscellaneous cross section with use of same

A metal plate comprises two flat wall forming portionsconnected together by a joint portion, a plurality of reinforcing wall forming portionsupwardly projecting from each of the wall forming portionsintegrally therewith, and a side wall forming portionformed at each of opposite side edges of the plate and upwardly projecting therefrom integrally therewith. A projectionis formed on the upper end of the reinforcing wall forming portionon the flat wall portion, and a recessfor the projectionto fit in is formed in the upper end of the wall forming portionto be butted against the portionand provided on the other flat wall portion. The metal plate satisfies the relationships of: A&#x3e;a, A/a&#x2266;1.5, B/b&#x2266;1.5, C/c&#x2266;1.5, and D/d/&#x2266;1.5 wherein A is the cross sectional area of the projection, B is the height of the projection, C is the maximum width of the projection, D is the width of upper end of the projection, a is the cross sectional area of the recess, b is the depth of the recess, c is the maximum width of the recess, and d is the width of an opening of the recess

A process for producing a flat heat exchange tube having parallel refrigerant passages in its interior and comprising flat upper and lower walls, opposite side walls and a plurality of reinforcing walls connected between the upper and lower walls, extending longitudinally of the tube and spaced apart from one another by a predetermined distance, using a rolling mill including a central work roll and a plurality of planetary work rolls arranged around a portion of the periphery of the central work roll and spaced apart circumferentially thereof, the central work roll being formed with parallel annular grooves in the periphery thereof. An aluminum sheet blank including a brazing sheet is rolled by the mill and thereby thinned to a predetermined thickness to form a flat portion serving as the lower wall, cause the annular grooves at opposite roll ends to form upright portions providing the respective side walls and the other annular grooves to form vertical ridges providing the reinforcing walls, the upright portions and the vertical ridges projecting from the flat portion integrally therewith. An aluminum sheet comprising a brazing sheet is placed over all the ridges to provide the upper wall and joined to the upright portions to make the upright portions serve as the opposite side walls, and the ridges of the lower wall are joined to the upper wall to form the reinforcing walls.

Process for producing flat heat exchange tubes

Growing community of inventors

Oyama, Japan

Satoru Kaimura