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Forging process for engine crankshaft of excavator

An engine and excavator technology, applied in the field of forging technology, can solve the problems of many ordinary forging equipment and uncommon advanced technology, and achieve the effect of good metal flow, simple process and dense organization

Inactive Publication Date: 2010-09-08
林素伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, there are many obsolete ordinary forging equipment that need to be transformed and updated. At the same time, backward technology and equipment still occupy a dominant position, and advanced technology has been applied but not yet universal.

Method used

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  • Forging process for engine crankshaft of excavator
  • Forging process for engine crankshaft of excavator
  • Forging process for engine crankshaft of excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] 1) For material selection, steel rods with a metal grade of 40Cr are selected.

[0042] 2) For blanking, choose Φ120mm raw steel sawing according to the crankshaft model. The length of the blank blank is 1000mm, which is consistent with the forging process regulations. Use calipers and tape measures to check the size of the material, and visually check that the inclination of the saw edge does not exceed 2°, and the burr is not large. Greater than 2mm.

[0043] 3) Heating, using a double-chamber pusher furnace to heat the billet. The one-time charge of the pusher furnace is less than 15 pieces. The temperature of the billet is controlled at 1180 ° C ~ 1240 ° C, and the heating time is 40 ± 9 minutes. Thermometer checks the temperature of the billet and records it;

[0044] 4) Clean up, put the heated billet on the scale beating machine to clean the oxide scale on the billet surface.

[0045] 5) Bending, put the cleaned blank into the bending die chamber of the hammer ...

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Abstract

The invention discloses a forging process for an engine crankshaft of an excavator, belonging to the forging molding technical field of a mechanical engine crankshaft for a large building. The invention successively comprises the process steps of selecting materials, blanking, heating, cleaning, compression-bending, finish forging, hot trimming and testing. The invention is characterized in that using a double chamber ejector furnace to heat billets, placing the heated billets on a beating oxide scale machine to clean the oxide scales on the surfaces of the billets, placing the cleaned billets in a forging hammer mould for compression-bending and finish forging, placing the forgings on a trimming die for hot trimming and at last testing whether the product is qualified. The invention has the advantages that the produced crankshaft forging has tight tissue, good metal streamline, high tensile strength, fatigue strength and hardenability, small deformation when strengthening treatment is carried out, high creep strength at high temperature and high qualified rate of the product, and the produced crankshaft forging can achieve mass production.

Description

technical field [0001] The invention relates to a forging process, in particular to a forging process of an excavator engine crankshaft. Background technique [0002] The crankshaft is an important part of the engine. Its material is made of carbon structural steel or ductile iron. It has two important parts: the main journal and the connecting rod journal. The main journal is installed on the cylinder block, the connecting rod journal is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, which is a typical slider crank mechanism. [0003] As an important moving part, the engine crankshaft has high design requirements. At the same time, due to the extremely harsh working conditions of the crankshaft, the requirements for crankshaft material, crankshaft dimensional accuracy, surface roughness, heat treatment and surface strengthening, and dynamic balance are very strict. Under the condi...

Claims

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Application Information

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IPC IPC(8): B21K1/08B21J1/00B21J1/06
Inventor 翁国冲赖霞虹林素伟
Owner 林素伟
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