Piston blank, piston forming module and multi-path sequential controlled cooling forming method

Abstract

The invention provides a piston blank, a piston forming module and a multi-path sequential controlled cooling forming method. The piston blank comprises a piston body, the skirt of the piston body is provided with a skirt outer circle of 1-1.5 mm, the periphery of an insert ring of the piston body is provided with an insert ring bulge of 6-10 mm, the peripheral face of the head of the piston body is provided with a head outer circle of 1.5-2 mm, and the top face of the head of the piston body is provided with a head slag accumulation top face of 4-8 mm. A 3-5mm head inner ring top surface is arranged on the inner side of the head slag deposition top surface, and a 3-6mm necking area is arranged between the head inner ring top surface and the riser; the skirt outer circle, the insert ring bulge and the head outer circle are sequentially connected from bottom to top; the head slag deposition top face, the head inner ring top face, the necking-down area and the dead head are sequentially connected from outside to inside, and the diameter of the dead head is 25%-35% of the outer diameter of a piston blank. The machining allowance of the piston blank is effectively reduced, materials are saved, the production cost is reduced, a sequential controlled cooling mode is adopted, the metallographic structure of a piston base body is refined, casting defects are avoided, and the quality of a piston finished product is effectively improved.

Description

technical field [0001] The invention relates to the technical field of piston forming, more specifically, to a piston blank. It also relates to a piston forming module used for forming and processing piston blanks. It also relates to a multi-channel sequential controlled cold forming method applied to the piston forming die set. Background technique [0002] The basic structure of the aluminum alloy piston can be decomposed into inner cavity 01, seam 02, skirt 03, head 04, combustion chamber 05, and most pistons also include insert ring 06 and oil passage 07, such as figure 1 shown. The aluminum alloy piston is obtained by processing the piston blank. The basic structure of the existing piston blank can be decomposed into skirt outer circle 08, ring bulge 09, head outer circle 010, head top surface 011, head positioning cone surface 012, For mouth 013, machining allowances are set for seam 02, skirt outer circle 08, and head 04. Piston blank structure such as figure 2 ...

AI Technical Summary

Problems solved by technology

[0003] However, the machining allowance of the piston blank combustion chamber 05 and riser 013 on the market is too large, resulting in a large processing waste and high production costs

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