Flywheel starter ring gear failures and hardness variation reduction in surface hardening process

Case studies in engineering failure analysis Pub Date : 2015-10-01 DOI:10.1016/j.csefa.2015.02.001

Selçuk Can Yücel, Levent Özenli, Türker Gençol, Ersoy Alanyalı

{"title":"Flywheel starter ring gear failures and hardness variation reduction in surface hardening process","authors":"Selçuk Can Yücel, Levent Özenli, Türker Gençol, Ersoy Alanyalı","doi":"10.1016/j.csefa.2015.02.001","DOIUrl":null,"url":null,"abstract":"<div>In general technical applications, truck heavy duty engine flywheel starter ring gears teeth is conventionally induction hardened and tempered in order to meet metallurgical aspects on specification. Especially for large sectioned starter ring gears (in this case diameter of the gear is 470mm) the critical issue is to maintain a stable hardness distribution on gear cross sections. These hardness variations in process could yield to:<ul><li>1.High scrap costs due to out of specification parts.</li><li>2.Increase in tact time in process, decrease in labor efficiency due to scrap rate and excessive hardness measurements.</li><li>3.Potential risk of failure on engine in low mileages.</li><li>4.100% hardness measurements in ongoing process which leads to time and cost waste.</li></ul>This technical paper summarizes the case study conducted for truck flywheel starter ring gears with diameter of 470mm in order to reduce hardness variation by optimization of induction hardening and tempering processes.</div>","PeriodicalId":91224,"journal":{"name":"Case studies in engineering failure analysis","volume":"4 ","pages":"Pages 8-19"},"PeriodicalIF":0.0000,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csefa.2015.02.001","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case studies in engineering failure analysis","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S221329021500005X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 5

Abstract

In general technical applications, truck heavy duty engine flywheel starter ring gears teeth is conventionally induction hardened and tempered in order to meet metallurgical aspects on specification. Especially for large sectioned starter ring gears (in this case diameter of the gear is 470 mm) the critical issue is to maintain a stable hardness distribution on gear cross sections. These hardness variations in process could yield to:

1.
High scrap costs due to out of specification parts.
2.
Increase in tact time in process, decrease in labor efficiency due to scrap rate and excessive hardness measurements.
3.
Potential risk of failure on engine in low mileages.
4.
100% hardness measurements in ongoing process which leads to time and cost waste.

This technical paper summarizes the case study conducted for truck flywheel starter ring gears with diameter of 470 mm in order to reduce hardness variation by optimization of induction hardening and tempering processes.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

飞轮起动机环齿失效及表面硬化过程中硬度变化减小

在一般技术应用中，卡车重型发动机飞轮启动环齿采用传统的感应淬火和回火，以满足冶金方面的要求。特别是对于大截面的启动环齿轮(在这种情况下，齿轮的直径是470毫米)，关键问题是保持一个稳定的硬度分布在齿轮的横截面。这些硬度变化在加工过程中可能产生:1。由于零件不符合规格，导致报废成本高。由于废品率和过多的硬度测量，增加了加工时间，降低了劳动效率。在进行过程中进行100%硬度测量，导致时间和成本的浪费。本文对直径为470mm的货车飞轮起动机环齿进行了实例研究，旨在通过优化感应淬火和回火工艺来减小其硬度变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Case studies in engineering failure analysis

自引率

0.00%

发文量