CN1334346A - Method for enhancing fatigue strength of gear by shot peening strengthening process - Google Patents
Method for enhancing fatigue strength of gear by shot peening strengthening process Download PDFInfo
- Publication number
- CN1334346A CN1334346A CN01117713A CN01117713A CN1334346A CN 1334346 A CN1334346 A CN 1334346A CN 01117713 A CN01117713 A CN 01117713A CN 01117713 A CN01117713 A CN 01117713A CN 1334346 A CN1334346 A CN 1334346A
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- China
- Prior art keywords
- peening
- gear
- shot
- wheel tooth
- fatigue strength
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Disclosed is a method for enhancing fatigue strength of a gear by producing compressive residual stress on a gear surface using shot peening. In the method according to the present invention, a plurality of shot balls are projected 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, and particularly a direction forming an angle of 0 DEG to 15 DEG relative to the straight line by use of high-pressure air.
Description
The present invention relates to by utilizing stress peening process to form the method that compressive residual stress improves the fatigue strength of gear at gear surface.
Because the development of technology requires to have high intensity on the mechanical component of uses such as motor vehicle or industrial device.The method of the intensity of multiple raising mechanical component etc. has been proposed therewith together.For the gear of one of basic mechanical component, mainly be to utilize stress peening process to improve its intensity.
Thereby stress peening process is by keeping the method that compressive residual stress improves product strength to a large amount of shot-peening of product surface projected at high velocity on product surface.Use sand throwing impeller or air nozzle in order to throw shot-peening, utilize the method for air nozzle projection shot-peening to be widely used recently.
Fig. 1 illustrates the stress peening process method with air nozzle projection shot-peening, and as shown in the figure, high-pressure air supply-pipe 3 and shot-peening supply-pipe 4 are connected on the air nozzle 2, and air nozzle 2 is towards gear 1.Shot-peening by shot-peening supply-pipe 4 supplying-nozzles 2 is throwed to the surface of gear 1 at high speed by the kinergety of the high-pressure air that sprays by nozzle 2.
When shot-peening high velocity impact during to gear 1 surperficial, because this impact makes the compressive residual stress of gear surface become big.Therefore, the intensity of gear 1 is enhanced, particularly because the intensity of stressed tooth root part when having increased gear 1 start widely, so can prevent the breakage of gear 1.
But in above-mentioned original method of utilizing the intensity that stress peening process improves gear 1 like that, the shot-peening of launching from air nozzle 2 is to the projection of the center of gear 1.In other words, shot-peening to the perpendicular direction projection of tangent line of the such gear circle of root face and pitch circle.Therefore, the compressive residual stress that forms on the side of the wheel tooth that tilts with projecting direction is than a little less than the compressive residual stress that forms on increment face and the root face.
That is, as shown in Figure 2, for increment face and root face, because shot-peening is to throwing with the orthogonal direction of its face, so the impact energy (E that shot-peening was applied when colliding its surface
1) have a 1/2mv
2Size, but for the side of the wheel tooth that tilts with increment face and root face is because shot-peening throws with tilt angle theta, so the impact energy (E that shot-peening added when colliding the side of wheel tooth
2) have a 1/2mv
2Sin θ size.Therefore, the compressive residual stress that forms on the side of wheel tooth is than a little less than the compressive residual stress that forms on increment face and the root face.Its result, because the distortion that difference produced of compressive residual stress, and at the two ends of increment face, promptly the lateral border at wheel tooth forms projection.
During the gear start, the projection that forms on the lateral border of wheel tooth is interfered root face and being impacted repeatedly, and the root face that has a gear is by damaged and shorten the problem in the life-span of gear.
In order to prevent that above-mentioned phenomenon from taking place, when making gear, after blasting process, must or grind that cutting operation removes projection by preshaving.So, owing to need append the equipment and the operating personnel of necessity of removing projection, manufacturing expense increases and becomes the low major cause of productivity.
On the other hand, when the gear start, stressed maximum on the side of wheel tooth.And since the size of the compressive residual stress that forms on the side of wheel tooth with than the side on the size of the compressive residual stress that forms on the increment face of the stressed wheel tooth that lacks compare little, so must increase the required time of blasting process so that have necessary strength on the side of wheel tooth.Therefore, the consumption that exists activity duration and shot-peening increases and the other problems of the lost of life of shotblast unit.
The object of the present invention is to provide a kind of size at the compressive residual stress that forms on the side of wheel tooth at least than big in the size of the compressive residual stress that forms on the increment face and the stress peening process that utilizes that can prevent to form projection on the lateral border at wheel tooth and can shorten the operation required time improves the method for fatigue strength.
Utilizing stress peening process of the present invention to improve the method for the fatigue strength of gear, is to throwing with the direction that is connected as the straight line almost parallel of the intersection point of the point circle of the intersection point of the root face of the wheel tooth of strengthening object and involute urve and the wheel tooth adjacent with the wheel tooth of above-mentioned reinforcement object and involute urve when utilizing high-pressure air to a large amount of shot-peening of gear surface projection.
It is desirable to, projecting direction becomes 0 ° to 15 ° angle with the point circle that the intersection point of involute urve reaches the wheel tooth adjacent with the wheel tooth of above-mentioned reinforcement object with the straight line of the intersection point of involute urve with the root face that is connected as the wheel tooth of strengthening object.
The purpose of the invention described above and other feature and advantage will be clear and definite with reference to following explanation to the preferred embodiments of the present invention.
Fig. 1 is that diagram utilizes original air nozzle stress peening process to improve the figure of the method for Gears Fatigue Strength.
Fig. 2 is the figure that is illustrated in the projecting direction of shot-peening in original method.
The figure of Fig. 3 to be explanation set in the method for utilizing the fatigue strength that stress peening process improves gear of the present invention process of shot-peening projectional angle.
The figure of Fig. 4 to be explanation set in the method for utilizing the fatigue strength that stress peening process improves gear of the present invention process of shot-peening projectional angle.
Below, illustrate in greater detail the present invention by embodiment.
Present inventors' shot-peening when understanding shot peening is tested with respect to the crevice projection angle and the relation between the size of the compressive residual stress that forms on the machined surface of machined surface.On the surface of heat treated plain plate (organizational composition: martensite 80%, austenite 20%), throw shot-peening (the cut-out type of wire form (round cut wire type) of circle with different projectional angles by carburizing, diameter 0.6mm, HRC58～62), the size and the degree of depth of the compressive residual stress that on the surface of steel plate, forms have been measured.Experimental result is as shown in the table.
| The shot-peening projectional angle | 90° | 80° | ?70° | ?60° | ?50° |
| Maximum compression unrelieved stress (Kg/mm 2) | 135 | 130 | ?111 | ?105 | ?101 |
| Compressive residual stress forms the degree of depth (μ m) | 120 | 95 | ?88 | ?78 | ?75 |
From this table as can be seen, to the vertical direction projection of machined surface shot-peening the time, the compressive residual stress maximum that forms on machined surface is the darkest, and the size of the more little compressive residual stress that forms on machined surface of projectional angle is more little, and its degree of depth is also more little.In addition, this also can be according to the formula E=1/2mv of kinergety
2Sin θ gives proof in theory.
Therefore, the method of utilizing stress peening process to improve the fatigue strength of gear of the present invention, in blasting process, the angle beta that throws on the stressed big part when as shown in Figure 3, being the gear start in the side that is incident upon wheel tooth is than throw shot-peening on the big direction of the angle [alpha] of throwing on the stressed smaller part of increment face or root face.
Its result, big or small similar or bigger at the size of the compressive residual stress that forms on the side of wheel tooth and the compressive residual stress that on the increment face, forms.Therefore, the lateral border that can prevent wheel tooth is out of shape and forms projection on the lateral border of wheel tooth.
On the other hand, in the side of such wheel tooth, be necessary to strengthen the fatigue strength of stressed maximum part tooth root point B2 when the gear start.Therefore, consider this point, only projecting direction is the direction of the straight line parallel of the intersection points B 1 of justifying with involute urve that extends to the wheel tooth adjacent with the wheel tooth of strengthening object from the intersection points B 2 as the involute urve of the wheel tooth of strengthening object and root face and increment in theory as shown in Figure 4.On this direction, projection during shot-peening in the wheel tooth fatigue strength of stressed largest portion also can become maximum.
But, in fact the part in the shot-peening that is throwed and B1 point collide, because its change in travel direction tends to take place to hinder shot-peening to B2 point progressive phenomenon, in order to prevent the generation of this phenomenon, must throw shot-peening in that shot-peening is projected on the direction that path on the B2 point can be subjected to minimum influence.
This direction is by the size and the various factor decisions such as hardness, velocity of projection and shape of products of shot-peening, experimental result shows, when with respect to the B2 point of the Zhu Yuanshang that connects gear when straight line that B1 is ordered becomes the direction of 0 °～15 ° angle to throw shot-peening, the size of the compression retained strength that forms on stressed maximum tooth root point B2 also becomes maximum value.
Therefore, by becoming with the straight line that is connected B1 and B2 on 0 ° to 15 ° the direction of angle to throw shot-peening, big or small similar or bigger at the size of the compressive residual stress that forms on the side of wheel tooth and the compressive residual stress that on the increment face, forms.Therefore, can prevent to resemble producing projection at the lateral border of wheel tooth original, therefore, need behind blasting process, not implement to be used to remove cutting of projection and push up or grind and cut operation.
Have again, because on the side of wheel tooth, the size of the compression retained strength that particularly forms on tooth root point B2 becomes maximum, so can reduce the necessary required time of fatigue strength that on the side of wheel tooth, obtains.
Understand the present invention in detail according to embodiment above, but the present invention is not limited to embodiment, if having the common knowledge of the technical field of the invention, under the situation that does not break away from thought of the present invention and spirit, can revise or change the present invention.
Claims (2)
1. utilize shot peening strengthening to improve the method for the fatigue strength of gear, it is to utilize the stress peening process that forms compressive residual stress to a large amount of shot-peening of gear surface projection on gear surface by high-pressure air to improve the method for the fatigue strength of gear, it is characterized in that, to be connected the method for throwing above-mentioned shot-peening as the direction of the straight line parallel of the intersection point (B1) of the point circle of the intersection point (B2) of the root face of the wheel tooth of strengthening object and involute urve and the wheel tooth adjacent and involute urve with the wheel tooth of above-mentioned reinforcement object.
2. the method for claim 1 is characterized in that, above-mentioned projecting direction becomes 0 ° to 15 ° angle with above-mentioned straight line.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR41104/2000 | 2000-07-18 | ||
| KR10-2000-0041104A KR100373280B1 (en) | 2000-07-18 | 2000-07-18 | a gear processing method using air nozzle shot peening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1334346A true CN1334346A (en) | 2002-02-06 |
Family
ID=19678546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01117713A Pending CN1334346A (en) | 2000-07-18 | 2001-04-29 | Method for enhancing fatigue strength of gear by shot peening strengthening process |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20020029597A1 (en) |
| EP (1) | EP1174217A1 (en) |
| JP (1) | JP2002039328A (en) |
| KR (1) | KR100373280B1 (en) |
| CN (1) | CN1334346A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451079A (en) * | 2014-12-11 | 2015-03-25 | 南车戚墅堰机车车辆工艺研究所有限公司 | Gear surface shot peening finishing method |
| CN104625967A (en) * | 2014-12-24 | 2015-05-20 | 上海振华重工集团(南通)传动机械有限公司 | Shot blasting treatment method for increasing stress of gear workpiece |
| CN105142831A (en) * | 2013-02-21 | 2015-12-09 | 住友电工硬质合金株式会社 | Surface-coated cutting tool and process for producing same |
| CN110281160A (en) * | 2018-03-19 | 2019-09-27 | 株式会社不二制作所 | The surface treatment method of the workpiece made of hard brittle material |
| CN110564938A (en) * | 2019-10-16 | 2019-12-13 | 中南大学 | Gear partition composite shot blasting strengthening method and spiral bevel gear |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003088935A (en) * | 2001-09-13 | 2003-03-25 | Sumitomo Heavy Ind Ltd | Manufacturing method of external gear |
| JP4812220B2 (en) * | 2002-05-10 | 2011-11-09 | 株式会社小松製作所 | High hardness and toughness steel |
| JP2004076125A (en) * | 2002-08-21 | 2004-03-11 | Komatsu Ltd | Rolling member |
| KR100465509B1 (en) * | 2002-11-26 | 2005-01-13 | 임성혁 | Impeller type of shot peening equipment having air conditioner |
| JP4390576B2 (en) * | 2003-03-04 | 2009-12-24 | 株式会社小松製作所 | Rolling member |
| JP4390526B2 (en) * | 2003-03-11 | 2009-12-24 | 株式会社小松製作所 | Rolling member and manufacturing method thereof |
| EP1555329A1 (en) | 2004-01-15 | 2005-07-20 | Siemens Aktiengesellschaft | Workpiece with internal compressive stresses, method and apparatus for producing internal compressive stresses |
| JP5298958B2 (en) * | 2009-03-03 | 2013-09-25 | 日産自動車株式会社 | Shot peening processing method, hypoid gear using the processing method, and shot peening processing apparatus |
| JP6706929B2 (en) | 2016-02-22 | 2020-06-10 | 三菱航空機株式会社 | How to improve fatigue strength |
| DE102016012941B4 (en) * | 2016-10-28 | 2019-06-06 | Mvo Gmbh Metallverarbeitung Ostalb | Process for machining a toothed rack and subsequently machined rack |
| CN108318244B (en) * | 2018-01-23 | 2019-12-31 | 重庆大学 | Carburized and hardened gear contact fatigue risk assessment method considering residual stress |
| WO2023120985A1 (en) | 2021-12-22 | 2023-06-29 | 주식회사 포스코 | 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 (en) * | 1991-07-31 | 2001-12-17 | マツダ株式会社 | Shot peening method for gear parts |
| US5911780A (en) * | 1995-07-13 | 1999-06-15 | Komatsu Ltd. | Gear shot peening method |
| JP3835910B2 (en) * | 1997-12-01 | 2006-10-18 | 株式会社小松製作所 | Gear shot peening method and high strength gear obtained thereby |
-
2000
- 2000-07-18 KR KR10-2000-0041104A patent/KR100373280B1/en not_active IP Right Cessation
-
2001
- 2001-04-18 JP JP2001120227A patent/JP2002039328A/en not_active Withdrawn
- 2001-04-19 EP EP01109691A patent/EP1174217A1/en not_active Withdrawn
- 2001-04-29 CN CN01117713A patent/CN1334346A/en active Pending
- 2001-05-01 US US09/845,173 patent/US20020029597A1/en not_active Abandoned
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105142831A (en) * | 2013-02-21 | 2015-12-09 | 住友电工硬质合金株式会社 | Surface-coated cutting tool and process for producing same |
| US9920423B2 (en) | 2013-02-21 | 2018-03-20 | Sumitomo Electric Hardmetal Corp. | Surface-coated cutting tool and process for producing same |
| CN104451079A (en) * | 2014-12-11 | 2015-03-25 | 南车戚墅堰机车车辆工艺研究所有限公司 | Gear surface shot peening finishing method |
| CN104451079B (en) * | 2014-12-11 | 2016-07-06 | 南车戚墅堰机车车辆工艺研究所有限公司 | A kind of gear teeth face shot peening strengthening finely finishing method |
| CN104625967A (en) * | 2014-12-24 | 2015-05-20 | 上海振华重工集团(南通)传动机械有限公司 | Shot blasting treatment method for increasing stress of gear workpiece |
| CN110281160A (en) * | 2018-03-19 | 2019-09-27 | 株式会社不二制作所 | The surface treatment method of the workpiece made of hard brittle material |
| CN110281160B (en) * | 2018-03-19 | 2021-12-03 | 株式会社不二制作所 | Method for treating the surface of a workpiece made of a hard and brittle material |
| US11389929B2 (en) | 2018-03-19 | 2022-07-19 | Fuji Manufacturing Co., Ltd. | Method for surface treatment of workpiece made from hard-brittle material |
| CN110564938A (en) * | 2019-10-16 | 2019-12-13 | 中南大学 | Gear partition composite shot blasting strengthening method and spiral bevel gear |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100373280B1 (en) | 2003-02-25 |
| US20020029597A1 (en) | 2002-03-14 |
| KR20020007700A (en) | 2002-01-29 |
| JP2002039328A (en) | 2002-02-06 |
| EP1174217A1 (en) | 2002-01-23 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |