CN111719109A - Method for solving breakage of optical axis and threads of rocker shaft of steering gear - Google Patents

Method for solving breakage of optical axis and threads of rocker shaft of steering gear Download PDF

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Publication number
CN111719109A
CN111719109A CN202010607604.8A CN202010607604A CN111719109A CN 111719109 A CN111719109 A CN 111719109A CN 202010607604 A CN202010607604 A CN 202010607604A CN 111719109 A CN111719109 A CN 111719109A
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CN
China
Prior art keywords
steering gear
rocker shaft
hardness
optical axis
induction heating
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.)
Pending
Application number
CN202010607604.8A
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Chinese (zh)
Inventor
江海涛
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Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
Original Assignee
Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
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Publication date
Application filed by Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd filed Critical Knorr-Bremse Detc Commercial Vehicle Braking Technology Co ltd
Priority to CN202010607604.8A priority Critical patent/CN111719109A/en
Publication of CN111719109A publication Critical patent/CN111719109A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention provides a method for solving the problem of breakage of an optical axis and threads of a rocker shaft of a steering gear, which comprises the following steps: (1) different parts of a rocker shaft of the steering gear are designed with different hardness, the hardness of an optical axis part is HRC34-42, the optical axis part extends to a transition round angle intersected with a sector part, the hardness of a thread part and a spline part is HRC44-52, and the hardness of the sector part is HRC 58-63; (2) in order to meet the hardness requirements of different parts of the rocker shaft of the steering gear, a local induction heating annealing process is adopted after the whole body of the rocker shaft of the steering gear is carburized and quenched. According to the invention, different hardness is designed at different parts of the rocker arm shaft of the steering gear, and a local induction heating annealing process is adopted, so that the risk of breakage of the optical shaft part and the threaded part of the rocker arm shaft of the steering gear is mainly solved, and meanwhile, the risk of brittle fracture of other parts of the steering gear in the use process is reduced.

Description

Method for solving breakage of optical axis and threads of rocker shaft of steering gear
Technical Field
The invention belongs to the field of automobile steering gears, and discloses a method for solving breakage of an optical axis and threads of a rocker shaft of a steering gear.
Background
The steering gear is an important safety part of an automobile, a rocker shaft of the steering gear generally comprises a threaded part, a spline part, a middle smooth shaft part, a sector part and an outer smooth shaft part which form a whole, the low-carbon alloy steel is adopted for the whole carburizing and quenching and then low-temperature tempering process, and the surface hardness is HRC 58-63; in order to prevent the locking thread of the vertical wall from being brittle-broken, the thread part is coated with impermeable coating to prevent the thread from carburizing, and the hardness of the whole hardened thread part is in the range of HRC30-45 to reduce the brittle-breaking tendency of the thread. In the actual use process, however, the rocker arm shaft is subjected to a large torque, so that brittle failure accidents are easy to occur at the thread; meanwhile, the anti-seepage coating is coated, so that the uniformity of the coating is difficult to ensure, the threads cannot be ensured to be protected, and a large risk exists; moreover, the spline part is easy to have brittle broken spline teeth, and cracks are also formed at the transition round angle between the optical axis and the sector teeth.
Disclosure of Invention
In order to overcome the problems that the optical axis, the thread and the spline of the rocker shaft of the existing steering gear are easy to break and the thread cannot be effectively protected in seepage prevention, the invention provides a method for solving the problem that the optical axis and the thread of the rocker shaft of the steering gear break, different hardness is designed for different parts of the rocker shaft, and a new heat treatment process is adopted to achieve the specified hardness.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for solving breakage of an optical axis and threads of a rocker shaft of a steering gear is characterized by comprising the following steps:
(1) different parts of a rocker shaft of the steering gear are designed with different hardness, the hardness of an optical axis part is HRC34-42, the optical axis part extends to a transition round angle intersected with a sector part, the hardness of a thread part and a spline part is HRC44-52, and the hardness of the sector part is HRC 58-63;
(2) in order to meet the hardness requirements of different parts of the rocker shaft of the steering gear, a local induction heating annealing process is adopted after the whole body of the rocker shaft of the steering gear is carburized and quenched.
The technical scheme is further limited as follows: the local induction heating annealing process is 2 times, the thread part and the spline part of the steering gear rocker shaft are subjected to local induction heating annealing independently, and the optical axis part is subjected to local induction heating annealing independently. The local annealing is divided into 2 times, so that the hardness requirements are respectively controlled, and the inductor is easy to set and realize.
The technical scheme is further limited as follows: the heating temperature in the induction heating annealing process is 550-600 ℃.
The invention has the beneficial effects that: according to the invention, different hardness is designed for different parts of the rocker arm shaft of the steering gear, and different hardness requirements are realized by adopting a process of local induction heating and annealing after integral carburizing and quenching; the hardness of the thread part and the spline part is reduced to HRC44-52, so that the phenomena of breakage of transition parts, threads and spline teeth of the thread part and the spline part are avoided; the hardness of the optical axis part is reduced to HRC34-42 and extends to a transition fillet intersected with the sector part, so that cracks at the transition fillet of the optical axis and the sector part are avoided; comprehensively, different parts of the rocker arm shaft of the steering gear are designed with different hardness, and a local induction heating annealing process is adopted, so that the risk of breakage of the optical shaft part and the threaded part of the rocker arm shaft of the steering gear is mainly solved, and meanwhile, the risk of brittle fracture of other parts of the steering gear in the use process is reduced.
Drawings
FIG. 1 is a schematic view of the construction of a rocker shaft of a steering gear of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
A method for solving breakage of an optical axis and threads of a rocker shaft of a steering gear specifically comprises the following steps:
(1) as shown in fig. 1, the steering gear rocker shaft comprises a threaded portion 1, a spline portion 2, a sector gear portion 4 and an optical axis portion, wherein the optical axis portion comprises a middle optical axis portion 3 and an outer optical axis portion 5, and the sector gear portion 4 is located between the middle optical axis portion 3 and the outer optical axis portion 5; different parts of the rocker shaft of the steering gear are designed with different hardness, the hardness of the light shaft parts (the middle light shaft part 3 and the outer light shaft part 5) is HRC34-42, and the light shaft parts extend to transition fillets a and b intersected with the sector part, the hardness of the thread part 1 and the spline part 2 is HRC44-52, and the hardness of the sector part 4 is HRC 58-63;
(2) in order to meet the hardness requirements of different parts of the rocker shaft of the steering gear, after the rocker shaft of the steering gear is integrally carburized and quenched, a local induction heating annealing process is adopted; the local induction heating annealing process is 2 times, the thread part and the spline part of the steering gear rocker shaft are subjected to local induction heating annealing independently, and the optical axis part is subjected to local induction heating annealing independently. The local annealing is divided into 2 times, so that the hardness requirements are respectively controlled, and the inductor is easy to set and realize.
Example 2
Example 2 differs from example 1 only in that: the local induction heating annealing process is 1 time, and the local induction heating annealing of the optical axis part, the thread part and the spline part is realized on the induction heating annealing equipment at one time.
By adopting the embodiment 2, the production efficiency is improved.
In the above embodiment, the heating temperature in the induction heating annealing process is 550 to 600 ℃.
In the invention, the whole steering gear rocker shaft is carburized and quenched, and the depth of a carburized layer is usually 0.8-1.2 mm.
The technical innovation of the invention is as follows: different parts of the rocker shaft of the steering gear are designed with different hardness and a heat treatment process method adopted for achieving the specified hardness.

Claims (4)

1. A method for solving breakage of an optical axis and threads of a rocker shaft of a steering gear is characterized by comprising the following steps:
(1) different parts of a rocker shaft of the steering gear are designed with different hardness, the hardness of an optical axis part is HRC34-42, the optical axis part extends to a transition round angle intersected with a sector part, the hardness of a thread part and a spline part is HRC44-52, and the hardness of the sector part is HRC 58-63;
(2) in order to meet the hardness requirements of different parts of the rocker shaft of the steering gear, a local induction heating annealing process is adopted after the whole body of the rocker shaft of the steering gear is carburized and quenched.
2. The method of claim 1 for addressing failure of the optic axis and threads of a rocker shaft of a steering gear, wherein the method comprises the steps of: the local induction heating annealing process is 2 times, the thread part and the spline part of the steering gear rocker shaft are subjected to local induction heating annealing independently, and the optical axis part is subjected to local induction heating annealing independently.
3. The method for solving the problem of the breakage of the optical axis and the threads of the rocker shaft of the steering gear according to claim 1 or 2, wherein the method comprises the following steps: the heating temperature in the induction heating annealing process is 550-600 ℃.
4. The method for solving the problem of the breakage of the optical axis and the threads of the rocker shaft of the steering gear according to claim 1 or 2, wherein the method comprises the following steps: the whole steering gear rocker shaft is carburized and quenched, and the depth of a carburized layer is 0.8-1.2 mm.
CN202010607604.8A 2020-06-30 2020-06-30 Method for solving breakage of optical axis and threads of rocker shaft of steering gear Pending CN111719109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010607604.8A CN111719109A (en) 2020-06-30 2020-06-30 Method for solving breakage of optical axis and threads of rocker shaft of steering gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010607604.8A CN111719109A (en) 2020-06-30 2020-06-30 Method for solving breakage of optical axis and threads of rocker shaft of steering gear

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117387937A (en) * 2023-12-13 2024-01-12 万向钱潮股份公司 Transmission shaft processing method and device

Citations (7)

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Publication number Priority date Publication date Assignee Title
JPH02149639A (en) * 1988-11-30 1990-06-08 Honda Motor Co Ltd Method for locally softening cast article
JPH06158147A (en) * 1992-11-27 1994-06-07 Hitachi Metals Ltd Tool and heat treatment method therefor
CN1536236A (en) * 2003-04-08 2004-10-13 Functional pointed screw with local hardening and its making method
CN1584068A (en) * 2004-05-21 2005-02-23 中国重型汽车集团有限公司 Local softening process for active umbrella gearing of heavy vehicle
US20090173301A1 (en) * 2008-01-09 2009-07-09 Roller Bearing Company Of America, Inc Surface treated rocker arm shaft
CN104357622A (en) * 2014-11-10 2015-02-18 沈阳黎明航空发动机(集团)有限责任公司 Local softening method of high-strength alloy steel carburized parts
CN106755911A (en) * 2016-12-23 2017-05-31 郑州华威齿轮有限公司 A kind of driving gear axle thread and R angles Technology for Heating Processing and equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02149639A (en) * 1988-11-30 1990-06-08 Honda Motor Co Ltd Method for locally softening cast article
JPH06158147A (en) * 1992-11-27 1994-06-07 Hitachi Metals Ltd Tool and heat treatment method therefor
CN1536236A (en) * 2003-04-08 2004-10-13 Functional pointed screw with local hardening and its making method
CN1584068A (en) * 2004-05-21 2005-02-23 中国重型汽车集团有限公司 Local softening process for active umbrella gearing of heavy vehicle
US20090173301A1 (en) * 2008-01-09 2009-07-09 Roller Bearing Company Of America, Inc Surface treated rocker arm shaft
CN104357622A (en) * 2014-11-10 2015-02-18 沈阳黎明航空发动机(集团)有限责任公司 Local softening method of high-strength alloy steel carburized parts
CN106755911A (en) * 2016-12-23 2017-05-31 郑州华威齿轮有限公司 A kind of driving gear axle thread and R angles Technology for Heating Processing and equipment

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Title
黄勇等: "螺纹退火零件断裂失效分析及控制方法", 《热处理技术与装备》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117387937A (en) * 2023-12-13 2024-01-12 万向钱潮股份公司 Transmission shaft processing method and device

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Inventor after: Jiang Haitao

Inventor after: Guo Changsheng

Inventor before: Jiang Haitao

RJ01 Rejection of invention patent application after publication
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Application publication date: 20200929