Selçuk Can Yücel, Levent Özenli, Türker Gençol, Ersoy Alanyalı
{"title":"飞轮起动机环齿失效及表面硬化过程中硬度变化减小","authors":"Selçuk Can Yücel, Levent Özenli, Türker Gençol, Ersoy Alanyalı","doi":"10.1016/j.csefa.2015.02.001","DOIUrl":null,"url":null,"abstract":"<div><p>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:</p><ul><li><span>1.</span><span><p>High scrap costs due to out of specification parts.</p></span></li><li><span>2.</span><span><p>Increase in tact time in process, decrease in labor efficiency due to scrap rate and excessive hardness measurements.</p></span></li><li><span>3.</span><span><p>Potential risk of failure on engine in low mileages.</p></span></li><li><span>4.</span><span><p>100% hardness measurements in ongoing process which leads to time and cost waste.</p></span></li></ul><p>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.</p></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":"{\"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><p>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:</p><ul><li><span>1.</span><span><p>High scrap costs due to out of specification parts.</p></span></li><li><span>2.</span><span><p>Increase in tact time in process, decrease in labor efficiency due to scrap rate and excessive hardness measurements.</p></span></li><li><span>3.</span><span><p>Potential risk of failure on engine in low mileages.</p></span></li><li><span>4.</span><span><p>100% hardness measurements in ongoing process which leads to time and cost waste.</p></span></li></ul><p>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.</p></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}","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}
Flywheel starter ring gear failures and hardness variation reduction in surface hardening process
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.
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