Manufacturing method of compressor pulley
AssigneeHalla Climate Control Corporation
InventorsHeon Sang Lee, Seok Je Jeong, Gyeong Min Kim, Jong Mok Kim
Life of this patent
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Abstract
A compressor pulley having a partially cold forged base of improved strength and a bridge of improved strength is easily manufactured. Metal is heated to a predetermined temp and then hot forged into a pulley shape. A piercing step then forms a through hold in a center portion of the pulley. The heated pulley is then cooled to room temperature. Then the pulley is rough guided. A partial cold-forging step forges the base at room temperature. A slot is then pierced in the base portion. During a finishing step, groove working and grinding are performed on a surface of the pulley.
Claims10
A method of manufacturing a compressor pulley which comprises a plate-shaped base portion, and an internal ring portion and an external ring portion that are each integrally formed with the base portion and protrude in a length direction of the compressor pulley, said method comprising:
- heating a metallic material to at least a predetermined temperature;
- hot-forging the metallic material into a pulley shape having the base portion, the internal ring portion and the external ring portion;
- piercing a center portion of the metallic material to form a through-hole at a connecting portion connecting with an inner surface of the internal ring portion;
- cooling the heated metallic material to a room temperature;
- grinding inner and outer surfaces of the cooled metallic material;
- partially cold-forging the base portion at the room temperature;
- forming slots at the base portion;
- and
- performing groove working and grinding on a surface of the pulley-shaped metallic material,
- wherein
- a thickness of a bridge portion that is formed between the slots after the grinding is larger than a standard thickness of the base portion, and
- the partial cold-forging is performed only on the bridge portion that has the thickness larger than the standard thickness of the base portion.
A method of manufacturing a compressor pulley which comprises a plate-shaped base portion, and an internal ring portion and an external ring portion that are each integrally formed with the base portion and protrude in a length direction of the compressor pulley, said method comprising:
- heating a metallic material to a predetermined temperature;
- hot-forging the metallic material into a pulley shape having the base portion, the internal ring portion and the external ring portion;
- forming a through-hole at the metallic material at a connecting portion;
- cooling the heated metallic material to a room temperature;
- grinding inner and outer surfaces of the cooled metallic material;
- partially cold-forging the base portion at the room temperature;
- forming a slot at the base portion;
- and
- performing groove working and grinding on a surface of the pulley-shaped metallic material,
- wherein
- a thickness of the base portion after the grinding is larger than a standard thickness of the base portion, and
- the partial cold-forging is performed only on the base portion which has the thickness larger than the standard thickness of the base portion.
Dependencies are inferred from the claim text.