Manufacturing process of solid cold-spun forged steel piston with internal cooling oil chamber

A technology for cooling oil chambers and integral pistons, applied in the field of piston manufacturing technology, can solve the problems of large size difference, high cost, high welding rejection rate, etc., to increase the flexibility of the skirt, facilitate the clearance of cylinders, and facilitate oil return. Effect
CN102423843BActive Publication Date: 2013-06-05BINZHOU BOHAI PISTON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BINZHOU BOHAI PISTON CO LTD
Publication Date
2013-06-05

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Abstract

The invention discloses a manufacturing process of a solid cold-spun forged steel piston with an internal cooling oil chamber. The manufacturing process comprises the following steps: performing solid forging to obtain a piston blank; machining a semi-finished piston product with an inside part of the internal cooling oil chamber and a shielding part for blocking off the internal cooling oil chamber; then heating the shielding part, and spinning downwards the shielding part of the internal cooling oil chamber of the piston by adopting the hot spinning process so that the shielding part contacts with the inside part of the internal cooling oil chamber so as to form the complete internal cooling oil chamber; and reserving the gap between the inside part and the shielding part of the internal cooling oil chamber and the shielding part without disposal or simply closing the gap by argon-arc welding and other common welding processes, and then performing precision machining to finally obtain the finished piston. The manufacturing process has the advantages of simple structure, more simple and convenient manufacturing procedures, high production efficiency, low manufacturing cost and the like, and can meet the requirements of an engine on high power, high strength and low emission.
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Description

technical field

[0001] The invention relates to a manufacturing process of a piston, in particular to a manufacturing process of a cold spinning forged steel integral piston with an inner cooling oil cavity. Background technique

[0002] At present, high-performance diesel engines used in trucks, construction machinery, railway locomotives, and ships require high power, low fuel consumption, low noise, and low emissions, and their strengthening degree is increasing day by day. At present, the explosion pressure of domestically developed automotive diesel engines has exceeded 20MPa, and the traditional cast aluminum pistons have been difficult to meet the reliability requirements of high-performance diesel engines. For high-power, high-load diesel engine pistons, articulated structure pistons and forged steel pistons have emerged as the times require.

[0003] Piston with hinged pendulum structure, that is, the piston head and piston skirt are manufactured separately and con...

Claims

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