FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and can be used in producing heat exchange tubes with shaped tips. Tube prepared, its end is fitted in split female die cavity made with face collar to contact tube face with said collar. Tube locked in position, mandrel with two teeth is entered into said tube so that outer tooth external edge is located opposite female die cylindrical flange outer edge. Then, female die segments are displaced in radial direction. Then, mandrel is displaced towards female die face collar to pre-fill die gravure with tube material. Now, tube bulge is finally formed in conditions of axial back pressure by displacing mandrel in opposite direction.
EFFECT: higher quality of tubes.
11 dwg
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|
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