Process for manufacturing a cast metal heat exchanger housing for a vehicle heater

A cast metal heat exchanger housing for a vehicle heater, the cast metal heat exchanger housing comprising:

• a pot-shape housing wall elongated in a direction of a housing longitudinal axis;
• and
• a plurality of heat transfer ribs extending in the direction of the housing longitudinal axis on an outer side of the housing wall in an area of a circumferential wall of the housing wall and in an area of a bottom wall of the housing wall, wherein an axial end face of the heat exchanger housing, which axial end face is formed upon cutting off metallic material and is at right angles to the housing longitudinal and extends into an area of at least some of the heat transfer ribs, wherein the cast metal heat exchanger housing is formed by a process comprising:
• metal casting the metal heat exchanger housing with a sprue cross-sectional area provided in a casting mold, through which molten metallic material is poured during the metal casting, comprising, in a plane that is at right angles to the housing longitudinal axis, a central runner and, starting from the central runner, at least some of the heat transfer ribs;
• subsequent to the metal casting, cooling of the metallic material;
• and
• subsequent to the cooling, cutting off a sprue from the heat exchanger housing at a location corresponding to the plane that is at right angles to the housing longitudinal axis to form an axial end face of the heat exchanger housing, which axial end face corresponds to the sprue cross sectional area provided in the casting mold at the plane that is at right angles to the housing longitudinal axis and is at right angles to the housing longitudinal axis and extends into the area of at least some of the heat transfer ribs.

A process for manufacturing a cast metal heat exchanger housing, the process comprising:

• metal casting the metal heat exchanger housing comprising a vehicle heater pot-shape housing wall elongated in a direction of a housing longitudinal axis and comprising a plurality of heat transfer ribs extending in the direction of the housing longitudinal axis on an outer side of the housing wall in an area of a circumferential wall of the housing wall and in an area of a bottom wall of the housing wall, wherein a sprue cross-sectional area provided in a casting mold, through which molten metallic material is poured during the metal casting, comprises, in a plane perpendicular to the housing longitudinal axis, a central runner and, starting from the central runner, at least some of the heat transfer ribs;
• cooling the metallic material after metal casting the metal heat exchanger housing;
• and
• cutting off a sprue from the heat exchanger housing at a location corresponding to the plane that is at right angles to the housing longitudinal axis to form an axial end face of the heat exchanger housing after cooling the metallic material, the axial end face being provided in the casting mold at the plane perpendicular to the housing longitudinal axis and the axial end face being perpendicular to the housing longitudinal axis and extending into the area of at least some of the heat transfer ribs, the axial end face having an axial end face shape, the sprue cross sectional area having a sprue cross sectional area shape, wherein the axial end face shape is the same as the sprue cross sectional area shape.