CN105436840A - Surface treatment process of power steering gear wheel - Google Patents
Surface treatment process of power steering gear wheel Download PDFInfo
- Publication number
- CN105436840A CN105436840A CN201410386117.8A CN201410386117A CN105436840A CN 105436840 A CN105436840 A CN 105436840A CN 201410386117 A CN201410386117 A CN 201410386117A CN 105436840 A CN105436840 A CN 105436840A
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- China
- Prior art keywords
- carburizing
- gear shaping
- gear
- hardness
- power steering
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses surface treatment process of a power steering gear wheel. The process comprises steps of gear shaping and carburizing. After coarse gear shaping operation is performed, precise gear shaping operation is carried out. The single-side cutting amount of precise gear shaping reaches 0.20-0.25 mm. In the carburizing step, the depth of a carburizing layer ranges from 0.91 mm to 1.40 mm. The effective carburizing depth of teeth is within the range of 1.143 and 1.651 mm. The surface hardness is 56-64HRC. The hardness of a tooth core portion ranges from 28 to 48 HRC. Tempering is performed after the carburizing step in a continuous induction tempering furnace at the temperature of 190.56 DEG C for four hours. The wheel is subjected to shot blasting. A steel ball is 0.7 mm in diameter and 55 to 62 HRC in hardness. The shot blasting intensity is 0.016 to 0.022 A. The coverage rate of shot blasting is 200%. The power steering gear wheel is good in wear resistance and long in service lifetime.
Description
Technical field:
The present invention relates to a kind of metal parts process for treating surface, particularly a kind of process of surface treatment of power steering stgear gear.
Background technology:
Gear is the vitals of automobile power steering, requires that there are high anti-wear performance and the performance of antifatigue in the surface of gear.Existing technique is heat-treated after gear shaping, then carry out grinding.Gear impact strength and the anti-fatigue life of above-mentioned technique acquisition are lower.
Summary of the invention:
The object of the invention is to provide that a kind of anti-wear performance is good, the process of surface treatment of a kind of power steering stgear gear of long service life.
The technical scheme realizing the object of the invention is, a kind of process of surface treatment of power steering stgear gear, comprises gear shaping and carburization step, it is characterized in that: after thick gear shaping, carries out smart gear shaping, and the monolateral cutting output of smart gear shaping is 0.20-0.25mm; Carry out carburizing, case depth is 0.91mm-1.40mm, the effective carburizing depth of teeth portion is 1.143-1.651mm, case hardness is 56-64HRC, tooth core hardness is 28-48HRC, carries out tempering after carburizing, and tempering furnace is that sense of continuity answers tempering furnace, temperature is 190.56 DEG C, and tempering time is 4 hours; Shot-peening is carried out to gear; Steel ball size is 0.7mm, and ball hardness is 55-62HRC, and shot peening strength is (0.016-0.022) A, and shot-peening coverage rate is 200%.
The present invention has the remarkable advantage of the good long service life of anti-wear performance compared with the prior art.
Detailed description of the invention:
Existing cogged technique is, gear shaping → carburizing → roll flute processing, and because gear shaping is roughing, the stock removal of roll flute processing is comparatively large, produces grinding stress and crackle, causes gear life shorter.The present invention, for solving the problem, adopts following technique: thick gear shaping → smart gear shaping → Carburization Treatment → tempering → shot-peening.
Wherein the chipping allowance of smart gear shaping operation is monolateral cutting output 0.20-0.25mm; Case depth is 0.91mmmin, and teeth portion carburizing depth is (1.143-1.651) mm, and gear surface hardness is 56-64HRC, and the core hardness of tooth is 28-48HRC;
Temper, answers in tempering furnace at sense of continuity and carries out tempering, and temperature is 190.56 DEG C, and tempering time is 4 hours; Shot-peening, steel ball size used is 0.7mm, and hardness is 55-62HRC, and shot peening strength is (0.016-0.022) A, and shot-peening coverage rate is 200%.
Steel ball usable diameter used is that the steel wire of 0.7mm cuts into.
Former process test result:
When gear carries out impact strength, can bear the impact moment of 7000Nm, after long duration test, the attenuation rate of gears meshing moment of friction is 50%.
Present invention process test result:
When gear carries out impact strength, can bear the impact moment of 9000Nm, after long duration test, the attenuation rate of gears meshing moment of friction is 28%, obtains excellent effect.
Claims (1)
1. a process of surface treatment for power steering stgear gear, comprises gear shaping and carburization step, it is characterized in that: after thick gear shaping, carries out smart gear shaping, and the monolateral cutting output of smart gear shaping is 0.20-0.25mm; Carry out carburizing, case depth is 0.91mm-1.40mm, the effective carburizing depth of teeth portion is 1.143-1.651mm, case hardness is 56-64HRC, tooth core hardness is 28-48HRC, carries out tempering after carburizing, and tempering furnace is that sense of continuity answers tempering furnace, temperature is 190.56 DEG C, and tempering time is 4 hours; Shot-peening is carried out to gear; Steel ball size is 0.7mm, and ball hardness is 55-62HRC, and shot peening strength is (0.016-0.022) A, and shot-peening coverage rate is 200%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386117.8A CN105436840A (en) | 2014-08-07 | 2014-08-07 | Surface treatment process of power steering gear wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386117.8A CN105436840A (en) | 2014-08-07 | 2014-08-07 | Surface treatment process of power steering gear wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105436840A true CN105436840A (en) | 2016-03-30 |
Family
ID=55547716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410386117.8A Pending CN105436840A (en) | 2014-08-07 | 2014-08-07 | Surface treatment process of power steering gear wheel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105436840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113646126A (en) * | 2019-04-04 | 2021-11-12 | 马自达汽车株式会社 | Method for manufacturing hypoid gear |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494106A (en) * | 2011-12-26 | 2012-06-13 | 重庆清平机械厂 | Process for manufacturing 20 CrMo carburizing steel gear |
| CN102699644A (en) * | 2012-06-25 | 2012-10-03 | 南京金鑫传动设备有限公司 | Processing method for internally toothed annulus |
| CN103273285A (en) * | 2013-05-29 | 2013-09-04 | 宁波东湖液压传动有限公司 | Method for machining inner gear ring |
| CN103464991A (en) * | 2013-09-18 | 2013-12-25 | 江国辉 | Gear ring machining process |
| CN103737334A (en) * | 2014-01-26 | 2014-04-23 | 无锡市神力齿轮冷挤有限公司 | High-strength gear processing process |
-
2014
- 2014-08-07 CN CN201410386117.8A patent/CN105436840A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494106A (en) * | 2011-12-26 | 2012-06-13 | 重庆清平机械厂 | Process for manufacturing 20 CrMo carburizing steel gear |
| CN102699644A (en) * | 2012-06-25 | 2012-10-03 | 南京金鑫传动设备有限公司 | Processing method for internally toothed annulus |
| CN103273285A (en) * | 2013-05-29 | 2013-09-04 | 宁波东湖液压传动有限公司 | Method for machining inner gear ring |
| CN103464991A (en) * | 2013-09-18 | 2013-12-25 | 江国辉 | Gear ring machining process |
| CN103737334A (en) * | 2014-01-26 | 2014-04-23 | 无锡市神力齿轮冷挤有限公司 | High-strength gear processing process |
Non-Patent Citations (3)
| Title |
|---|
| 任伟霞 等: "高速柴油机凸轮轴齿轮用材及其热处理", 《热处理》 * |
| 白树全 等: "采煤机重载齿轮的制造及其热处理工艺", 《铸造技术》 * |
| 郑建军: "利用普通设备加工行星齿轮", 《金属加工(冷加工)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113646126A (en) * | 2019-04-04 | 2021-11-12 | 马自达汽车株式会社 | Method for manufacturing hypoid gear |
| CN113646126B (en) * | 2019-04-04 | 2023-10-20 | 马自达汽车株式会社 | Manufacturing method of hyperboloid gear |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160330 |
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| WD01 | Invention patent application deemed withdrawn after publication |