High-temperature thermomechanical treatment of hollow track pins of track-type machines

Andrei Zasypkin,Vyacheslav Dement'Yev,Mikhail Sterkhov,S Bratan,S Roshchupkin,S Leonov,S Gorbatyuk

doi:10.1051/matecconf/201712901075

Andrei Zasypkin, Vyacheslav Dement'Yev + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201712901075

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Abstract

Very often the track pins of heavy-loaded track-type machines have insufficient fatigue safety margin, which causes their frequent breakage. One of the most rational solutions of the problem is the use of the high-temperature thermomechanical treatment of hot-rolled tubular billets for track pins. The analysis of the investigation results and engineering developments shows the possibility of improving the performance characteristic of hollow items (shafts, axis pins, track pins for a caterpillar mover, torsion suspensions of an undercarriage, etc.) by combining the thermomechanical treatment strengthening, various methods for improving the quality of the surface of tubular billets and the application of developed technological schemes in the factories producing tubular billets and items with diameter of Ø 10 ÷ 60 mm and the parameters of safety margin, precision and roughness required for the durability of the items.

Highlights

The application of the tubular design of the track pins for a caterpillar chain in Russia is very limited
Hot-rolled tubular billets are used in track-type machines with an open hinge, where the cross-section area of the track pins provides the transverse strength with the safety margin of 2-3 in the absence of the limited weight requirements for the track pins
The use of hollow track pins solves a number of problems connected with their performance characteristic; the use of the tubular design leads to the decrease in the transverse strength of the track pins

Summary

Introduction

The application of the tubular design of the track pins for a caterpillar chain in Russia is very limited. The use of hollow track pins solves a number of problems connected with their performance characteristic; the use of the tubular design leads to the decrease in the transverse strength of the track pins. One of the ways for improving the transverse strength and performance characteristic of the hollow track pins operating in the condition of asymmetric constant-sign bending loading is when in the technological process of the track pins production, a strengthening high-temperature thermomechanical treatment (HTMT) with the deformation of a hot-rolled billet by spiral reduction (SR) with the simultaneous improvement of the quality of both the external and internal working surface is used [1]. The process of HTMT+SR is a complex of continuous actions on the tubular billet consisting of high-frequency heating to the temperatures higher than the austenization temperature, deformation in three tangentially placed idle rollers, and cooling in a sprayer device [2]

Methods

Results

Conclusion