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Welding process for crankshaft counter balance of internal combustion locomotive engine

A technology for diesel locomotives and welding processes, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as flaw detection errors, crankshaft deformation, etc., and achieve the effect of expanding space and high starting point of welding technology

Active Publication Date: 2014-12-17
CRRC ZIYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a welding process for the engine crankshaft balance block, which overcomes some difficulties in the traditional process and solves many problems such as process requirements, preheating, welding cracks and crankshaft deformation, post-weld heat treatment, and flaw detection errors. The starting point of welding technology High, meet the high-quality requirements of balance block welding, can realize the localization of a series of locomotive diesel engine crankshafts, and expand the space for crankshaft production and application

Method used

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  • Welding process for crankshaft counter balance of internal combustion locomotive engine
  • Welding process for crankshaft counter balance of internal combustion locomotive engine
  • Welding process for crankshaft counter balance of internal combustion locomotive engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment includes the following steps:

[0056] 1) Design welding groove:

[0057] The groove of the balance weight adopts a groove form with blunt edges and double J+V: root R=15mm, groove surface angle α 1 =35°、α 2 =50°, H=20mm, the thickness of the blunt edge p=3mm; the arc start and stop ends with L=10mm and width B=15mm are processed in the same size at both ends of the balance weight;

[0058] 2) Preheating:

[0059] Enter the heating furnace to preheat the whole to 330°C, keep it for 1.5 hours, and immediately weld the tires after the furnace is released;

[0060] 3) Formal welding:

[0061] The balance weight is assembled symmetrically along the crankshaft axial and circumferential direction, and the balance weight assembly gap is 1~2mm; The MAG welding method of G4Si1 / ER50-6 welding wire, two people weld the balance weight symmetrically at the same time; welding current ≯300A, welding voltage ≯34V; multi-layer multi-pass welding, single-pass welding requirements: ...

Embodiment 2

[0069] This embodiment includes the following steps:

[0070] 1) Design welding groove:

[0071] The bevel of the balance weight process adopts a bevel form with blunt edges and double J+V: root R=25mm, bevel surface angle α 1 =25°、α 2 =55°, H=25mm, the thickness of the blunt edge p=4mm; the arc start and stop ends with L=15mm and width B=20mm are processed in the same size at both ends of the balance weight;

[0072] 2) Preheating:

[0073] Enter the heating furnace to preheat the whole to 350°C, keep it for 1.5 hours, and immediately weld the tires after being out of the furnace;

[0074] 3) Formal welding:

[0075] The balance weight is assembled symmetrically along the crankshaft axial and circumferential direction, and the balance weight assembly gap is 1~2mm; MAG welding method of G4Si1 / ER50-6 welding wire, two people weld balance weights symmetrically at the same time; welding current ≯300A, welding voltage ≯34V; multi-layer multi-pass welding, single-pass welding seam requiremen...

Embodiment 3

[0083] This embodiment includes the following steps:

[0084] 1) Design welding groove:

[0085] The groove of the balance weight adopts a groove form with blunt edges and double J+V: root R=23mm, groove surface angle α 1 =30°、α 2 =52°, H=23mm, the thickness of the blunt edge p=4mm; the arc start and stop ends with L=15mm and width B=18mm are processed in the same size at both ends of the balance weight;

[0086] 2) Preheating:

[0087] Enter the heating furnace to preheat the whole to 300℃, keep it for 2 hours, and immediately put the tire on welding after being out of the furnace;

[0088] 3) Formal welding:

[0089] The balance weight is assembled symmetrically along the crankshaft axial and circumferential direction, and the balance weight assembly gap is 1~2mm; MAG welding method of G4Si1 / ER50-6 welding wire, two people weld balance weights symmetrically at the same time; welding current ≯300A, welding voltage ≯34V; multi-layer multi-pass welding, single-pass welding seam requireme...

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Abstract

The invention discloses a welding process for a crankshaft counter balance of an internal combustion locomotive engine. The process comprises the following steps of: (1) designing a welding groove; (2) preheating; (3) normally welding; (4) cleaning and performing seal welding; (5) annealing; and (6) profiling and performing radiographic flaw detection. Due to the adoption of the process disclosed by the invention, difficulty in the prior art is overcome, the problems of processing requirements, preheating, welding cracks, crankshaft deformation, post-welding thermal treatment, flaw detection errors and the like are solved, the welding technical starting point is high, high quality requirement on counter balance welding is met, localization of a series of locomotive diesel engine crankshafts can be realized, and the crankshaft production and application spaces are enlarged.

Description

Technical field [0001] The invention relates to a welding process of engine components, in particular to a welding process of a crankshaft balance weight of a diesel locomotive engine. Background technique [0002] The engine crankshaft is one of the most important parts of the engine, and its cost accounts for more than 60% of the total cost of the engine. When the crankshaft is in use, the connecting rod journal of the crankshaft is connected with the piston connecting rod to convert the up and down movement of the piston connecting rod into When the main shaft rotates, the crankshaft converts the up and down movement of the piston connecting rod into the rotation movement of the main shaft. Therefore, under the gravity of the connecting rod and the crank arm, it is easy to cause the crankshaft to rotate at an unstable speed and easy to oscillate. Accelerate the damage of the crankshaft, produce greater noise, and the output power is unstable. Therefore, the crankshaft balance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235
Inventor 邱友胜
Owner CRRC ZIYANG CO LTD
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