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Forging method of balance shaft of engine

A technology for balancing shafts and engines, which is applied to engine components, mechanical equipment, metal processing equipment, etc., can solve the problems that the strength of the shaft parts cannot meet the performance requirements, material waste, and many processes, and improve the appearance and surface finish. The effect of saving precious material resources and improving processing efficiency

Active Publication Date: 2012-12-19
JIANGSU JINYUAN FORGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the forging method in the prior art has many procedures, low efficiency and high cost, resulting in waste of materials
Some adopt the method of die casting, which can overcome the problem of material waste, but the strength of the shaft parts is far from meeting the performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The forging method of engine balance shaft of the present invention comprises the steps:

[0035] (1) Forging billet, cut the cast ingot, heat it to 950-1050°C, keep it warm for 40-50 minutes, and then forge it on the forging equipment. When forging, first compress and elongate in the radial direction, and then compress in the axial direction. Thick, then compressed and elongated in the radial direction;

[0036] (2) Preheat the mold to 680-780°C first, and then carry out isothermal pre-forging; during pre-forging, heat to 1150-1250°C, keep warm for 40-50 minutes, and then forge, wherein the heating rate is controlled at 8-9°C / min; initial forging temperature 1160~1240℃, final forging temperature 750℃~790℃;

[0037] (3) Put the pre-forged blank into the cleaning solution for etching and cleaning to remove the surface oxide layer, wherein; the cleaning solution is a mixed aqueous solution of sulfuric acid and hydrochloric acid with a mass percentage of 5-15%, adding 1-...

Embodiment 2

[0042] The forging method of engine balance shaft of the present invention comprises the steps:

[0043] (1) Forging billet, cut the cast ingot, heat it to 950-1050°C, keep it warm for 40-50 minutes, and then forge it on the forging equipment. When forging, first compress and elongate in the radial direction, and then compress in the axial direction. Thick, then compressed and elongated in the radial direction;

[0044] (2) Isothermal pre-forging, the heating temperature is 1150-1250°C, the holding time is 40-50min, the initial forging temperature is 1160-1240°C, and the final forging temperature is 750°C-790°C;

[0045] (3) Isothermal precision forging, the heating temperature is 1150-1250°C, the holding time is 40-50min, the initial forging temperature is 1160-1240°C, and the final forging temperature is 750°C-790°C;

[0046] (4) Perform solid solution treatment and aging treatment on the parts after precision forging. The solid solution treatment is to put the parts in a h...

Embodiment 3

[0048] The forging method of engine balance shaft of the present invention comprises the steps:

[0049] (1) Forging billet, cut the cast ingot, heat it to 950-1050°C, keep it warm for 40-50 minutes, and then forge it on the forging equipment. When forging, first compress and elongate in the radial direction, and then compress in the axial direction. Thick, then compress and elongate in the radial direction;

[0050] (2) Isothermal pre-forging, the heating temperature is 1150-1250°C, the holding time is 40-50min, the initial forging temperature is 1160-1240°C, and the final forging temperature is 750°C-790°C;

[0051] (3) Put the pre-forged blank into the cleaning solution for etching and cleaning to remove the surface oxide layer, wherein; the cleaning solution is a mixed aqueous solution of sulfuric acid and hydrochloric acid with a mass percentage of 5-15%, adding 1-3% Potassium carbide, the temperature of the cleaning solution is 70-80°C;

[0052] (4) Isothermal precisio...

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Abstract

The invention discloses a forging method of a balance shaft of an engine with low cost, high efficiency and high strength. Isothermal finish forging is adopted in the method, the comprehensive performance of a material part can be improved, the internal density is increased, and the fiber direction is arranged along the shape of the part, so that each index can be met; the strength of the part is improved by over 1.1 times by adopting solid solution treatment and aging treatment; a cleaning and finishing method is adopted to remove a surface oxidation layer, and compared with the appearance obtained by a mechanical processing method, the surface finishing degree of the appearance of the part is greatly improved, and the part with requirements for the appearance size is easily met; and the processing efficiency is greatly improved, the processing cost can be reduced by over 10%, massive valuable material resources can be saved, and the material utilization ratio is improved by over 10% compared with that of a traditional method.

Description

technical field [0001] The invention relates to a forging processing method of engine components. Background technique [0002] The balance shaft is a key component in the auxiliary balance mechanism next to the crankshaft of the automobile engine. When the crankshaft rotates, the crankshaft gear drives the balance shaft gear to make the balance shaft rotate. At this time, the centrifugal force or its moment generated by the balance weight on the balance shaft is balanced with the reciprocating inertial force or its moment generated by the crankshaft. Due to the function of the balance shaft, the vibration and noise of the engine are effectively eliminated, the ride comfort is improved, and the durability of the car and the engine is increased. [0003] At present, a forging method adopted by the engine balance shaft is: heating, pre-forging, final forging, edge trimming, and finishing. The disadvantages of this solution are: a large-tonnage press is required, high energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J1/06B21K1/06
Inventor 葛艳明宋建强周庚龙
Owner JIANGSU JINYUAN FORGE