US20020029597A1 - Method for enhancing fatigue strength of gear using shotpeening - Google Patents
Method for enhancing fatigue strength of gear using shotpeening Download PDFInfo
- Publication number
- US20020029597A1 US20020029597A1 US09/845,173 US84517301A US2002029597A1 US 20020029597 A1 US20020029597 A1 US 20020029597A1 US 84517301 A US84517301 A US 84517301A US 2002029597 A1 US2002029597 A1 US 2002029597A1
- Authority
- US
- United States
- Prior art keywords
- gear
- tooth
- peening
- shot
- shot balls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005480 shot peening Methods 0.000 title claims abstract description 19
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 13
- 238000007796 conventional method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
Definitions
- the present invention relates to a method for enhancing fatigue strength of a gear by using shot peening to produce compressive residual stress on a gear surface.
- the shot peening is a method for enhancing strength of manufactures by projecting a plurality of shot balls at a high speed onto surfaces of the manufactures to leave compressive residual stress on the surfaces.
- An impeller or an air nozzle is used for projecting the shot balls, between which the air nozzle grows to be more and more used in the shot ball-projecting technology.
- FIG. 1 shows a schematic illustration of a shot peening method using an air nozzle to project shot balls.
- a high-pressure air supply pipe 3 and a shot ball supply pipe 4 are connected to the air nozzle 2 , and the air nozzle 2 faces a gear 1 .
- Shot balls are supplied to the air nozzle 2 via the shot ball supply pipe 4 and are projected at a high speed onto a surface of the gear 1 by means of kinetic energy of high-pressure air injected through the air nozzle 2 .
- the shot balls is projected from the air nozzle 2 toward a center of the gear 1 .
- the shot balls are projected in a direction orthogonal to a tangent line of a gear circle such as a root circle or a pitch circle. Consequently, the compressive residual stress produced on a side surface of the gear tooth sloping to the direction of projection is weaker than that produced on a tooth face or a tooth flank.
- the protrusions must be removed using a semi-topping or a grinding process followed by the shot peening process during manufacture of the gear. This means that additional equipments and workers are required for removing the protrusion, which causes increase of production cost and lowering in productivity.
- the present invention has been made to overcome the above-mentioned problems, and it is an object of the present invention to provide a method for enhancing fatigue strength of a gear using shot peening, in which magnitude of compressive residual stress produced on a side surface of a gear tooth is larger at least than that produced on a tooth face so that formation of protrusions at outer edges of the gear tooth can be prevented and process time required for the shot peening can be shortened.
- a plurality of shot balls are projected onto a gear surface in a direction parallel to a straight line connecting a contact point of a root circle and an involute curve of a gear tooth to be subjected to the peening to a contact point of a tooth face circle and an involute curve of a gear tooth adjacent to the gear tooth to be subjected to the peening by use of high-pressure air.
- the direction of projection of the shot balls forms an angle of 0°to 15°relative to the straight line connecting the contact point of the root circle and the involute curve of the gear tooth to be subjected to peening to the contact point of the tooth face circle and the involute curve of the gear tooth adjacent to the gear tooth to be subjected to the peening.
- FIG. 1 is a schematic view illustrating a conventional method for enhancing fatigue strength of a gear using air nozzle-shot peening
- FIG. 2 is a view showing a direction of projection of shot balls in the conventional method
- FIGS. 3 and 4 are views for explaining processes of setting the direction of projection of the shot balls in a method for enhancing fatigue strength of a gear using shot peening according to the present invention, respectively.
- the present inventors have conducted a series of experiments for finding out relationship between an angle at which shot balls are projected onto a working surface during the shot peening and compressive residual stress produced on the working surface.
- the experiments are performed in such a manner that the shot balls (round cut wire type, 0.6 mm in diameter, HRC 58 ⁇ 62) are projected onto a flat carburizing steel plate (texture composition: martensite 80 %, austenite 20 %) at different angles of projection and then magnitude and depth of the compressive residual stress produced on a surface of the steel plate are measured for each angle. Results of the experiments are shown in the following Table. Angle of projection of shot balls 90° 80° 70° 60° 50° Maximum compressive 135 130 111 105 101 residual stress (kg/mm 2 ) Depth of compressive 120 95 88 78 75 residual stress produced ( ⁇ m)
- the shot balls are projected during the shot peening process in a direction making an angle ⁇ at which the shot balls are projected onto a side surface of a gear tooth, that is, a portion to be subjected to large force when the gear is in operation be larger than an angle a at which the shot balls are projected onto a tooth face or a tooth flank, that is, a portion to be subjected to relatively small force as shown in FIG. 3.
- a deddendum point B 2 it is required to increase fatigue strength of a portion of the side surface of the gear tooth to which the largest force is applied when the gear is in operation, that is, a deddendum point B 2 .
- optimal direction of projection is theoretically said to be a direction parallel to a straight line connecting a contact point B 2 of a root circle and an involute curve of a gear tooth to be subjected to the peening to a contact point B 1 of a tooth face circle and an involute curve of a gear tooth adjacent to the gear tooth to be subjected to the peening as shown in FIG. 4. If the shot balls are projected in this direction, the fatigue strength of the portion of the gear tooth to which the largest force is applied can become the largest.
- the necessary time to obtain the fatigue strength required for the side surface of the gear tooth can be shortened because the magnitude of the compressive residual stress produced on the side surface of the gear tooth, in particular, the deddendum point B 2 is maximized by projecting the shot balls in the above-mentioned direction.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Heat Treatment Of Articles (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2000-0041104A KR100373280B1 (ko) | 2000-07-18 | 2000-07-18 | 에어노즐 숏피이닝을 이용한 기어가공방법 |
| KR2000-41104 | 2000-07-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20020029597A1 true US20020029597A1 (en) | 2002-03-14 |
Family
ID=19678546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/845,173 Abandoned US20020029597A1 (en) | 2000-07-18 | 2001-05-01 | Method for enhancing fatigue strength of gear using shotpeening |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20020029597A1 (ko) |
| EP (1) | EP1174217A1 (ko) |
| JP (1) | JP2002039328A (ko) |
| KR (1) | KR100373280B1 (ko) |
| CN (1) | CN1334346A (ko) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030070297A1 (en) * | 2001-09-13 | 2003-04-17 | Masataka Nakaoka | Method for fabricating external-tooth gears |
| US20040047757A1 (en) * | 2002-05-10 | 2004-03-11 | Komatsu Ltd. | High-hardness, high-toughness steels and crawler components, earth wear resistant components, fastening bolts, high-toughness gears, high-toughness, high contact pressure resistance gears, and wear resistant steel plates using the same |
| US20040256029A1 (en) * | 2003-03-11 | 2004-12-23 | Komatsu Ltd. | Rolling element and method of producing the same |
| US20050051240A1 (en) * | 2003-03-04 | 2005-03-10 | Komatsu Ltd. | Rolling element and method of producing the same |
| US20050241734A1 (en) * | 2002-08-21 | 2005-11-03 | Komatsu Ltd. | Rolling elements |
| CN108318244A (zh) * | 2018-01-23 | 2018-07-24 | 重庆大学 | 考虑残余应力的渗碳硬化齿轮接触疲劳风险评估方法 |
| CN110023519A (zh) * | 2016-10-28 | 2019-07-16 | Mvo奥斯塔尔博金属加工有限公司 | 用于加工齿条的方法和根据所述方法加工的齿条 |
| US10906112B2 (en) | 2016-02-22 | 2021-02-02 | Mitsubishi Aircraft Corporation | Method for improving fatigue strength |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100465509B1 (ko) * | 2002-11-26 | 2005-01-13 | 임성혁 | 냉각장치를 갖춘 임펠러방식의 쇼트피닝설비 |
| EP1555329A1 (de) * | 2004-01-15 | 2005-07-20 | Siemens Aktiengesellschaft | Bauteil mit Druckeigenspannungen, Verfahren zur Herstellung und Vorrichtung zur Erzeugung von Druckeigenspannungen |
| JP5298958B2 (ja) * | 2009-03-03 | 2013-09-25 | 日産自動車株式会社 | ショットピーニング加工方法，この加工方法を用いたハイポイド歯車及びショットピーニング加工装置 |
| JP6213867B2 (ja) | 2013-02-21 | 2017-10-18 | 住友電工ハードメタル株式会社 | 表面被覆切削工具およびその製造方法 |
| CN104451079B (zh) * | 2014-12-11 | 2016-07-06 | 南车戚墅堰机车车辆工艺研究所有限公司 | 一种齿轮齿面喷丸强化精整方法 |
| CN104625967A (zh) * | 2014-12-24 | 2015-05-20 | 上海振华重工集团(南通)传动机械有限公司 | 一种增加齿轮工件应力的抛丸处理方法 |
| JP6646700B2 (ja) | 2018-03-19 | 2020-02-14 | 株式会社不二製作所 | 硬質脆性材料製の被処理成品の表面加工方法 |
| CN110564938B (zh) * | 2019-10-16 | 2021-08-17 | 中南大学 | 一种齿轮分区复合喷丸强化方法及螺旋锥齿轮 |
| EP4455344A4 (en) | 2021-12-22 | 2025-07-30 | Posco Co Ltd | STEEL MATERIAL FOR HOT FORMING, HOT FORMED PART AND METHOD FOR MANUFACTURING THEREOF |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3238431B2 (ja) * | 1991-07-31 | 2001-12-17 | マツダ株式会社 | 歯車部品のショットピーニング方法 |
| EP0838308A4 (en) * | 1995-07-13 | 1999-06-02 | Komatsu Mfg Co Ltd | TRANSMISSION BALL BEAM METHOD AND TRANSMISSION |
| JP3835910B2 (ja) * | 1997-12-01 | 2006-10-18 | 株式会社小松製作所 | 歯車のショットピーニング方法およびそれにより得られる高強度歯車 |
-
2000
- 2000-07-18 KR KR10-2000-0041104A patent/KR100373280B1/ko not_active Expired - Fee Related
-
2001
- 2001-04-18 JP JP2001120227A patent/JP2002039328A/ja not_active Withdrawn
- 2001-04-19 EP EP01109691A patent/EP1174217A1/en not_active Withdrawn
- 2001-04-29 CN CN01117713A patent/CN1334346A/zh active Pending
- 2001-05-01 US US09/845,173 patent/US20020029597A1/en not_active Abandoned
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030070297A1 (en) * | 2001-09-13 | 2003-04-17 | Masataka Nakaoka | Method for fabricating external-tooth gears |
| US20040047757A1 (en) * | 2002-05-10 | 2004-03-11 | Komatsu Ltd. | High-hardness, high-toughness steels and crawler components, earth wear resistant components, fastening bolts, high-toughness gears, high-toughness, high contact pressure resistance gears, and wear resistant steel plates using the same |
| US20050241734A1 (en) * | 2002-08-21 | 2005-11-03 | Komatsu Ltd. | Rolling elements |
| US20050247377A1 (en) * | 2002-08-21 | 2005-11-10 | Komatsu Ltd. | Rolling elements |
| US20060016519A1 (en) * | 2003-03-04 | 2006-01-26 | Komatsu Ltd. | Rolling element and method of producing the same |
| US20050051240A1 (en) * | 2003-03-04 | 2005-03-10 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7544255B2 (en) | 2003-03-04 | 2009-06-09 | Komatsu Ltd. | Rolling element |
| US7691212B2 (en) | 2003-03-04 | 2010-04-06 | Komatsu Ltd. | Rolling element and method of producing the same |
| US20040256029A1 (en) * | 2003-03-11 | 2004-12-23 | Komatsu Ltd. | Rolling element and method of producing the same |
| US20060021679A1 (en) * | 2003-03-11 | 2006-02-02 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7422643B2 (en) | 2003-03-11 | 2008-09-09 | Komatsu Ltd. | Rolling element and method of producing the same |
| US7691213B2 (en) * | 2003-03-11 | 2010-04-06 | Komatsu Ltd. | Case hardened gear and method of producing the same |
| US10906112B2 (en) | 2016-02-22 | 2021-02-02 | Mitsubishi Aircraft Corporation | Method for improving fatigue strength |
| CN110023519A (zh) * | 2016-10-28 | 2019-07-16 | Mvo奥斯塔尔博金属加工有限公司 | 用于加工齿条的方法和根据所述方法加工的齿条 |
| CN108318244A (zh) * | 2018-01-23 | 2018-07-24 | 重庆大学 | 考虑残余应力的渗碳硬化齿轮接触疲劳风险评估方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020007700A (ko) | 2002-01-29 |
| CN1334346A (zh) | 2002-02-06 |
| KR100373280B1 (ko) | 2003-02-25 |
| EP1174217A1 (en) | 2002-01-23 |
| JP2002039328A (ja) | 2002-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOE, BYUNG-GIL;JEONG, TAE-SUNG;REEL/FRAME:011757/0112 Effective date: 20010402 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |