A corrective die for controlling the bending of crankshaft forgings using reverse pre-bending

CN224444341UActive Publication Date: 2026-07-03LIAONING 518 INTERNAL COMBUSTION ENGINE FITTINGS

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: LIAONING 518 INTERNAL COMBUSTION ENGINE FITTINGS
Filing Date: 2025-08-13
Publication Date: 2026-07-03

AI Technical Summary

Technical Problem

Existing crankshaft forgings are prone to bending and deformation during forging and heat treatment, leading to stress concentration, excessive dynamic balance, increased production costs and scrap rate, and difficulty in meeting the high precision requirements of automated production lines.

Method used

A split-type correction mold is adopted, which is divided into nine parts. A stepped correction upper mold base and lower mold base are designed and connected by bolts. The offset of the mold center is designed according to the reverse pre-bending structure and gradually increases, thereby controlling the bending deformation of the forging.

Benefits of technology

Effectively control the deformation of crankshaft forgings during cooling and heat treatment processes, improve straightness and indexing dimensional accuracy, reduce production costs, adapt to the needs of automated production, and reduce scrap rates.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

This utility model discloses a correction mold for controlling the bending of crankshaft forgings using reverse pre-bending. The correction mold is changed from a single-piece structure to a split structure. A stepped upper and lower correction mold base is designed according to the bending requirements. The correction mold is installed on the upper and lower mold bases using bolts. The step height of the upper and lower correction mold bases gradually increases along the radial direction of the first and seventh main shafts on both sides of the crankshaft, towards the fourth main shaft diameter. This utility model, through the correction mold design of reverse pre-bending + gradual compensation, achieves high-precision control, cost savings, improved production efficiency, and enhanced quality reliability. This solution is particularly suitable for high-precision, high-volume crankshaft forging production and has significant application value in the automotive, shipbuilding, and construction machinery industries.

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