JP6698940B2 - Warm rolling ring forming method for high carbon chrome bearing steel with spherical structure - Google Patents
Warm rolling ring forming method for high carbon chrome bearing steel with spherical structure Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims description 76
- 229910000831 Steel Inorganic materials 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 27
- 239000010959 steel Substances 0.000 title claims description 27
- 229910052799 carbon Inorganic materials 0.000 title claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 34
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 11
- 238000010583 slow cooling Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 238000000137 annealing Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 8
- 238000005242 forging Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005563 spheronization Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
- B21H1/12—Making articles shaped as bodies of revolution rings of restricted axial length rings for ball or roller bearings
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
Description
本発明は、塑性加工の技術分野に関し、特に球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法に関する。 The present invention relates to the technical field of plastic working, and more particularly to a method for forming a warm-rolled ring of a high carbon chromium bearing steel having a spheroidized structure.
ＧＣｒ１５軸受鋼をはじめとする高炭素クロム軸受鋼は、軸受部品に主に用いられる鋼であり、軸受内輪、外輪（軸受リングと略称する）生産において大量に応用される。リング圧延は、シームレスリング状部品（リング部品と略称する）の高度な回転塑性成形方法として、省エネ、材料節約、高品質および高効率の利点から、伝統的な鍛造成形方法に徐々に取って代わり、軸受リングを代表とするリング状部品の生産製造において広く応用されて認められている。高炭素クロム軸受鋼リングについては、典型的なＧＣｒ１５軸受リングを例にとると、現在の工業生産で使用されているリング圧延方法は、主に中型および小型軸受リングの常温の冷間成形に用いられる冷間リング圧延と、通常中型および大型軸受リングの鍛造温度帯の熱間成形に用いられる熱間リング圧延と、を含む。 High carbon chromium bearing steels such as GCr15 bearing steels are steels mainly used for bearing parts, and are applied in large quantities in the production of bearing inner rings and outer rings (abbreviated as bearing rings). Ring rolling is an advanced rotary plastic forming method for seamless ring-shaped parts (abbreviated as ring parts), which gradually replaces the traditional forging forming method because of the advantages of energy saving, material saving, high quality and high efficiency. , Is widely applied and recognized in the production and manufacture of ring-shaped parts such as bearing rings. For high carbon chrome bearing steel rings, taking the typical GCr15 bearing ring as an example, the ring rolling method currently used in industrial production is mainly used for cold forming of medium and small size bearing rings at room temperature. Cold ring rolling, and hot ring rolling commonly used for hot forming of forging temperature zones of medium and large bearing rings.
高炭素クロム軸受鋼の低塑性、高硬度および強度、ならびに不十分な冷間成形および切削加工性能のために、球状化焼鈍は、高炭素クロム軸受鋼リングの鍛造またはリング圧延製造において常に不可欠な重要なプロセスであった。リングブランクまたはリング鍛造品を球状化焼鈍することによって、材料のシート状パーライト構造中の炭化物を球状化して粒状パーライト構造を形成し、それによって可塑性を高め、硬度および強度を低下させ、製造プロセス要件を満たす。例えば、冷間リング圧延生産においては、冷間塑性加工性能を向上させるためにリングブランクの球状化焼鈍が必要であるが、熱間リング圧延および鍛造生産においては、切削加工性能を向上させるためにリング鍛造品の球状化焼鈍が必要である。しかしながら、高炭素クロム軸受鋼リングの工業生産で一般的に使用されている同一温度の球状化焼鈍は、一般に１０時間以上かかり、サイクルが長くエネルギー消費が高いだけでなく、炭化物粒子が粗くなりやすく、表面脱炭および酸化度が大きいため、後続の加工および最終熱処理の品質にまで影響を与える。高炭素クロム軸受鋼の急速球状化焼鈍に関する研究は、報告されているが、実際に工業で応用されていない。特に高炭素クロム軸受鋼リングの生産において、伝統的な球状化焼鈍プロセスが依然として使用され、コスト低減および品質向上が制限されている。したがって、製造業界における省エネルギーや排出量削減および高付加価値生産の現在の開発動向に直面している中、上記の高炭素クロム軸受鋼リングの球状化焼鈍問題を解決することが緊急の課題である。 Due to the low plasticity, high hardness and strength of high carbon chrome bearing steel, and insufficient cold forming and machining performance, spheroidizing annealing is always essential in the forging or ring rolling manufacturing of high carbon chrome bearing steel rings. It was an important process. Spheroidizing annealing of ring blanks or ring forgings spheroidizes the carbides in the sheet-like pearlite structure of the material to form a granular pearlite structure, thereby increasing plasticity, reducing hardness and strength, and manufacturing process requirements. Meet For example, in cold ring rolling production, spheroidizing annealing of a ring blank is necessary to improve cold plastic working performance, but in hot ring rolling and forging production, in order to improve cutting workability. Spheroidizing annealing of ring forgings is required. However, spheroidizing annealing at the same temperature, which is generally used in industrial production of high carbon chromium bearing steel rings, generally takes 10 hours or more, not only has a long cycle and high energy consumption, but also tends to cause coarse carbide particles. The surface decarburization and the high degree of oxidation affect the quality of subsequent processing and final heat treatment. Studies on rapid spheroidizing annealing of high carbon chromium bearing steels have been reported, but have not actually been applied in industry. Traditional spheroidizing annealing processes are still used, especially in the production of high carbon chrome bearing steel rings, limiting cost reduction and quality improvement. Therefore, while facing the current development trend of energy saving, emission reduction and high value-added production in the manufacturing industry, it is an urgent task to solve the above spheroidizing annealing problem of the high carbon chromium bearing steel ring. .
以上の現状に対し、本発明の目的は、球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法を提供することであり、材料の鍛造温度より低い温度で温間圧延リングの変形により材料の構造を直接球状化し、成形および球状化の一体化が実現され、伝統的な球状化焼鈍プロセスを省くことができ、効率の向上およびエネルギー消費の低減ができる。 With respect to the above-mentioned current situation, an object of the present invention is to provide a warm rolling ring forming method of a high carbon chrome bearing steel having a spheroidized structure, and by the deformation of the warm rolling ring at a temperature lower than the forging temperature of the material. The structure of the material is directly spheronized, the integration of shaping and spheronization is realized, the traditional spheronization annealing process can be omitted, the efficiency can be improved and the energy consumption can be reduced.
球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法において、
Ｓ１）加工しておいたリングブランクを加熱炉に入れ、材料の臨界温度Ａｃ１よりわずかに高い温度に加熱して５〜１０分間保持する低温オーステナイト化加熱ステップと、
Ｓ２）保温後のリングブランクを加熱炉内で１００℃／ｈ〜２００℃／ｈの冷却速度で材料の臨界温度Ａｒ１よりわずかに低い温度に徐々に冷却する炉内徐冷ステップと、
Ｓ３）冷却されたリングブランクを加熱炉からリングローリングミルに迅速に移し、４０％〜７０％の変形量およびＡｒ１以下１００℃内の仕上げ圧延温度で圧延する温間圧延成形ステップと、を含む。
In the warm rolling ring forming method of high carbon chromium bearing steel having a spheroidized structure,
S1) A low-temperature austenitizing heating step in which the processed ring blank is placed in a heating furnace, heated to a temperature slightly higher than the critical temperature Ac 1 of the material and held for 5 to 10 minutes,
S2) In-furnace slow cooling step of gradually cooling the ring blank after heat retention to a temperature slightly lower than the critical temperature Ar 1 of the material in the heating furnace at a cooling rate of 100° C./h to 200° C./h,
S3) a warm rolling forming step of rapidly transferring the cooled ring blank from the heating furnace to a ring rolling mill and rolling at a deformation amount of 40% to 70% and a finish rolling temperature of Ar 1 or less and 100°C or less. .
上記のステップＳ１において、リングブランクを加熱炉でＡｃ１以上１０℃〜４０℃に加熱する。 In step S1 above, the ring blank is heated to a temperature of Ac 1 or higher and 10° C. to 40° C. in a heating furnace.
上記のステップＳ２において、リングブランクを加熱炉でＡｒ１以下０℃〜５０℃に冷却する。 In step S2, the ring blank is cooled to 0° C. to 50° C. below Ar 1 in a heating furnace.
上記のステップＳ３において、圧延中にリングブランク温度をリアルタイムでモニタリングし、リングブランク温度が仕上げ圧延温度よりも低くなった時点で直ちに圧延を終了し、リングブランクを炉に戻して所定の初期圧延温度に加熱した後に、目標となるリングが成形されるまで圧延を継続する。 In step S3, the ring blank temperature is monitored in real time during rolling, and when the ring blank temperature becomes lower than the finish rolling temperature, the rolling is immediately terminated, the ring blank is returned to the furnace, and the predetermined initial rolling temperature is reached. After heating to 0, continue rolling until the target ring is formed.
本発明において、適切な圧延プロセス条件に基づいているので、材料は、臨界温度未満の温間成形プロセスで有効な構造球状化条件を得て、それによって変形すると同時に構造の球状化を達成する。まず、材料は、適切な加熱条件によって不完全で不均一なオーステナイト構造が得られる。次に、適切な冷却条件下で、炭化物粒子を過冷却オーステナイトから異常に分解して炭化物層の正常な分解を抑制する。最後に、適切な変形条件下で、温度と応力との作用により、炭化物粒子への炭素元素の拡散と凝集とが促進され、部分的に形成された炭化物層が破壊されて球状化し、最終的には圧延後に完全球状化の構造が得られる。上記の構造球状化過程が低温の急速圧延過程で完成するため、炭化物粒子が十分に成熟成長しておらず、微細で均一になり、圧延温度が低く、表面に明らかな酸化および脱炭がない。したがって、本発明は、温間圧延リング変形により直接構造の球状化を達成し、球状化焼鈍を省くことができ、球状化焼鈍が必要される冷間リング圧延および熱間リング圧延に比較し、エネルギー消費を大幅に低減し、効率を高め、しかも炭化物粒子が微小で良好な表面品質を有し、後続加工および最終的な熱処理の品質に有利であり、プロセスフロー短縮、生産コスト削減、生産効率向上および製品品質向上という有益な効果を有する。 In the present invention, because of the proper rolling process conditions, the material obtains effective structural spheronization conditions in the warm forming process below the critical temperature, thereby deforming and simultaneously achieving structural spheroidization. First, the material has an incomplete and inhomogeneous austenite structure by appropriate heating conditions. Next, under appropriate cooling conditions, the carbide particles are abnormally decomposed from the supercooled austenite to suppress the normal decomposition of the carbide layer. Finally, under suitable deformation conditions, the action of temperature and stress promotes the diffusion and agglomeration of carbon elements into the carbide particles, causing the partially formed carbide layer to break and spheroidize to the final A completely spherical structure is obtained after rolling. Since the above structural spheroidization process is completed by the low temperature rapid rolling process, the carbide particles do not mature and grow sufficiently, become fine and uniform, the rolling temperature is low, and there is no obvious oxidation and decarburization on the surface. . Therefore, the present invention achieves direct spheroidization of the structure by warm rolling ring deformation, it is possible to omit the spheroidizing annealing, compared to cold ring rolling and hot ring rolling spheroidizing annealing is required, Greatly reduce energy consumption, increase efficiency, small carbide particles and good surface quality, which is advantageous for quality of subsequent processing and final heat treatment, shorten process flow, reduce production cost, production efficiency It has the beneficial effect of improvement and product quality improvement.
以下、添付図面および実施例と関連付けて本発明をさらに説明する。 The present invention will be further described below with reference to the accompanying drawings and examples.
本発明の目的、技術手段および利点をより明確にするために、以下、添付図面および実施例と関連付けて、本発明をさらに詳細に説明する。なお、ここで記載されている具体的な実施例は、単に本発明を解釈することに用いられるものであり、本発明の限定することに用いられない。 In order to make the objects, technical means and advantages of the present invention clearer, the present invention will be described in more detail below in connection with the accompanying drawings and examples. It should be noted that the specific embodiments described herein are merely used for interpreting the present invention, and not for limiting the present invention.
本発明の好適な実施例において、図１に示すように、球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法において、以下のステップを含む。 In a preferred embodiment of the present invention, as shown in FIG. 1, a method for forming a hot rolled ring of a high carbon chromium bearing steel having a spheroidized structure includes the following steps.
Ｓ１）低温オーステナイト化加熱：加工しておいたリングブランクを加熱炉に入れ、材料の臨界温度Ａｃ１よりわずかに高い温度に加熱して５〜１０分間保持する。 S1) Low temperature austenitizing heating: The processed ring blank is put into a heating furnace, heated to a temperature slightly higher than the critical temperature Ac 1 of the material and held for 5 to 10 minutes.
Ｓ２）炉内徐冷：保温後のリングブランクを加熱炉内で１００℃／ｈ〜２００℃／ｈの冷却速度で材料の臨界温度Ａｒ１よりわずかに低い温度に徐々に冷却する。 S2) In-furnace slow cooling: The ring blank after heat retention is gradually cooled in the heating furnace at a cooling rate of 100° C./h to 200° C./h to a temperature slightly lower than the critical temperature Ar 1 of the material.
Ｓ３）温間圧延成形：冷却されたリングブランクを加熱炉からリングローリングミルに迅速に移して成形する。目標とするリングのサイズ、リングローリングミルの加工範囲および圧延力条件に基づいて、圧延率を合理的にして圧延送り速度を選択することによって、リングブランクの変形量を４０％〜７０％（リングブランクの変形量は、リングブランクの壁の肉薄率から算出される。）に、仕上げ圧延温度をＡｒ１以下１００℃内にする。リングブランクを当該変形量および変形温度範囲内で圧延成形する。 S3) Warm rolling forming: The cooled ring blank is rapidly transferred from the heating furnace to a ring rolling mill for forming. Based on the target ring size, ring rolling mill working range and rolling force conditions, the rolling rate is rationalized and the rolling feed rate is selected to reduce the deformation of the ring blank from 40% to 70% (ring The amount of deformation of the blank is calculated from the wall thinning ratio of the ring blank), and the finish rolling temperature is set to Ar 1 or less and 100° C. or less. The ring blank is roll-formed within the deformation amount and the deformation temperature range.
本発明の好適な実施例において、ステップＳ１では、リングブランクを加熱炉でＡｃ１以上１０℃〜４０℃に加熱する。 In a preferred embodiment of the present invention, in step S1, the ring blank is heated to Ac 1 or higher and 10°C to 40°C in a heating furnace.
本発明の好適な実施例において、ステップＳ２では、リングブランクを加熱炉でＡｒ１以下０℃〜５０℃に冷却する。 In a preferred embodiment of the present invention, in step S2, the ring blank is cooled to 0°C to 50°C below Ar 1 in a heating furnace.
本発明の好適な実施例において、ステップＳ３では、圧延中にリングブランク温度をリアルタイムでモニタリングし（具体的に温度測定装置で厳格にリングブランク温度をモニタリングする。）、リングブランク温度が仕上げ圧延温度よりも低くなった時点で直ちに圧延を終了し、リングブランクを炉に戻して所定の初期圧延温度に加熱した後に、目標となるリングが成形されるまで圧延を継続する。 In a preferred embodiment of the present invention, in step S3, the ring blank temperature is monitored in real time during rolling (specifically, the ring blank temperature is strictly monitored by a temperature measuring device), and the ring blank temperature is the finish rolling temperature. When the temperature becomes lower than that, the rolling is immediately terminated, the ring blank is returned to the furnace and heated to a predetermined initial rolling temperature, and then the rolling is continued until a target ring is formed.
以下、２つの実施例を列挙して本発明をさらに説明する。 Hereinafter, the present invention will be further described by listing two examples.
（実施例１）
ある規格のＧＣｒ１５高炭素クロム軸受鋼リングを例に取り、その球状化構造が達成される温間圧延リング成形方法において、以下のステップを含む。
(Example 1)
Taking a standard GCr15 high carbon chrome bearing steel ring as an example, a warm rolling ring forming method in which the spheroidized structure is achieved includes the following steps.
Ｓ１）低温オーステナイト化加熱：リングブランクをボックス型抵抗炉で７８０℃（Ａｃ１は約７５０℃である）に加熱し、１０分間保持する。 S1) Low temperature austenitizing heating: The ring blank is heated to 780° C. (Ac 1 is about 750° C.) in a box resistance furnace and held for 10 minutes.
Ｓ２）炉内徐冷：保温後のリングブランクを加熱炉内で２００℃／ｈの冷却速度で６５０℃（Ａｒ１は約７００℃である）に冷却する。 S2) In-furnace gradual cooling: The ring blank after heat retention is cooled to 650° C. (Ar 1 is about 700° C.) at a cooling rate of 200° C./h in a heating furnace.
Ｓ３）温間圧延成形：所定の初期圧延温度に達したリングブランクを加熱炉からリングローリングミルに迅速に移して圧延する。適切な圧延率および圧延送り速度の条件下で、リングブランクは、６００℃以上の温度で４０％の変形量になる圧延で変形し、目標となるリングに成形される。目標となるリングは、その後空冷すればよい。 S3) Warm rolling forming: The ring blank which has reached a predetermined initial rolling temperature is rapidly transferred from the heating furnace to a ring rolling mill and rolled. Under the conditions of appropriate rolling rate and rolling feed rate, the ring blank is deformed by rolling at a temperature of 600° C. or higher to a deformation amount of 40%, and is formed into a target ring. The target ring may then be air cooled.
（実施例２）
ある規格のＧＣｒ１５ＳｉＭｎ高炭素クロム軸受鋼リングを例に取り、その球状化構造が達成される温間圧延リング成形方法において、以下のステップを含む。
(Example 2)
Taking a standard GCr15SiMn high carbon chrome bearing steel ring as an example, a warm rolling ring forming method in which the spheroidized structure is achieved includes the following steps.
Ｓ１）低温オーステナイト化加熱：リングブランクをボックス型抵抗炉で７９０℃（Ａｃ１は約７７０℃である）に加熱し、５分間保持する。 S1) Low temperature austenitizing heating: The ring blank is heated to 790° C. (Ac 1 is about 770° C.) in a box resistance furnace and held for 5 minutes.
Ｓ２）炉内徐冷：保温後のリングブランクを加熱炉内で２００℃／ｈの冷却速度で７１０℃（Ａｒ１は約７１０℃である）に冷却する。 S2) In-furnace slow cooling: The ring blank after heat retention is cooled to 710° C. (Ar 1 is about 710° C.) at a cooling rate of 200° C./h in a heating furnace.
Ｓ３）温間圧延成形：所定の初期圧延温度に達したリングブランクを加熱炉からリングローリングミルに迅速に移して圧延する。適切な圧延率および圧延送り速度の条件下で、リングブランクは、６１０℃以上の温度で７０％の変形量になる圧延で変形し、目標となるリングに成形される。目標となるリングは、その後空冷すればよい。 S3) Warm rolling forming: The ring blank which has reached a predetermined initial rolling temperature is rapidly transferred from the heating furnace to a ring rolling mill and rolled. Under the conditions of appropriate rolling ratio and rolling feed rate, the ring blank is deformed by rolling at a temperature of 610° C. or higher to a deformation amount of 70%, and is formed into a target ring. The target ring may then be air cooled.
上記２つの実施例で成形された目標リングで得られた球状化構造と通常の球状化焼鈍で得られた球状化構造とを比較したところ、温間リング圧延による炭化物粒子の平均径は、約０．２５μｍであるが、通常の球状化焼鈍による炭化物粒子の平均径は、約０．４６μｍである。本発明の温間圧延リング成形方法を用いることで、高炭素クロム軸受鋼の球状化構造が達成できるだけではなく、明らかに炭化物粒子を微細化して球状化構造の品質が改善できることが分かる。 Comparing the spheroidized structure obtained by the target ring formed in the above two examples with the spheroidized structure obtained by ordinary spheroidizing annealing, the average diameter of the carbide particles by warm ring rolling is about Although it is 0.25 μm, the average diameter of the carbide particles obtained by ordinary spheroidizing annealing is about 0.46 μm. It can be seen that by using the warm rolling ring forming method of the present invention, not only the spheroidized structure of the high carbon chromium bearing steel can be achieved but also the quality of the spheroidized structure can be improved by clearly refining the carbide particles.
本発明は、ほかの高炭素クロム軸受鋼のリングにも適用し、その方法が上記実施例とは同一であり、効果も同一であるため、ここで実施例を枚挙しない。 The present invention is also applied to other rings of high carbon chrome bearing steel, and the method is the same as the above-mentioned embodiment and the effect is also the same, so that the embodiments will not be listed here.
なお、当業者は、上記説明に基づいて改良や変更を加えることができる。そのすべての改良や変更は、いずれも本発明の添付する請求項の保護範囲に属するべきである。 Note that those skilled in the art can make improvements and changes based on the above description. All such improvements and modifications should fall within the protection scope of the appended claims of the present invention.
（付記）
（付記１）
Ｓ１）加工しておいたリングブランクを加熱炉に入れ、材料の臨界温度Ａｃ１よりわずかに高い温度に加熱して５〜１０分間保持する低温オーステナイト化加熱ステップと、
Ｓ２）保温後のリングブランクを加熱炉内で１００℃／ｈ〜２００℃／ｈの冷却速度で材料の臨界温度Ａｒ１よりわずかに低い温度に徐々に冷却する炉内徐冷ステップと、
Ｓ３）冷却されたリングブランクを加熱炉からリングローリングミルに迅速に移し、４０％〜７０％の変形量およびＡｒ１以下１００℃内の仕上げ圧延温度で圧延する温間圧延成形ステップと、を含む、
ことを特徴とする球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法。
(Appendix)
(Appendix 1)
S1) A low-temperature austenitizing heating step in which the processed ring blank is placed in a heating furnace, heated to a temperature slightly higher than the critical temperature Ac 1 of the material and held for 5 to 10 minutes,
S2) In-furnace slow cooling step of gradually cooling the ring blank after heat retention to a temperature slightly lower than the critical temperature Ar 1 of the material in the heating furnace at a cooling rate of 100° C./h to 200° C./h,
S3) a warm rolling forming step of rapidly transferring the cooled ring blank from the heating furnace to a ring rolling mill and rolling at a deformation amount of 40% to 70% and a finish rolling temperature of Ar 1 or less and 100°C or less. ,
A method for forming a warm-rolled ring of high carbon chromium bearing steel having a spheroidized structure, which is characterized by the above.
（付記２）
ステップＳ１において、リングブランクを加熱炉でＡｃ１以上１０℃〜４０℃に加熱する、ことを特徴とする付記１に記載の球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法。
(Appendix 2)
In step S1, the ring blank is heated in a heating furnace to a temperature of Ac 1 or higher to 10° C. to 40° C. The method for forming a warm-rolled ring of spheroidized high carbon chromium bearing steel according to appendix 1.
（付記３）
ステップＳ２において、リングブランクを加熱炉でＡｒ１以下０℃〜５０℃に冷却する、ことを特徴とする付記１に記載の球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法。
(Appendix 3)
In step S2, the ring blank is cooled to 0° C. to 50° C. of Ar 1 or less in a heating furnace, and the method for forming a warm-rolled ring of spheroidized high carbon chromium bearing steel according to appendix 1.
（付記４）
ステップＳ３において、圧延中にリングブランク温度をリアルタイムでモニタリングし、リングブランク温度が仕上げ圧延温度よりも低くなった時点で直ちに圧延を終了し、リングブランクを炉に戻して所定の初期圧延温度に加熱した後に、目標となるリングが成形されるまで圧延を継続する、ことを特徴とする付記１に記載の球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法。
(Appendix 4)
In step S3, the ring blank temperature is monitored in real time during rolling, and when the ring blank temperature becomes lower than the finish rolling temperature, the rolling is immediately terminated, and the ring blank is returned to the furnace and heated to a predetermined initial rolling temperature. After that, rolling is continued until a target ring is formed, and the method for forming a warm-rolled ring of high carbon chromium bearing steel having a spheroidized structure according to appendix 1.
Claims (4)
Ｓ２）保温後のリングブランクを加熱炉内で１００℃／ｈ〜２００℃／ｈの冷却速度で材料の臨界温度Ａｒ１よりわずかに低い温度に徐々に冷却する炉内徐冷ステップと、
Ｓ３）冷却されたリングブランクを加熱炉からリングローリングミルに迅速に移し、４０％〜７０％の変形量およびＡｒ１以下１００℃内の仕上げ圧延温度で圧延する温間圧延成形ステップと、を含む、
ことを特徴とする球状化構造の高炭素クロム軸受鋼の温間圧延リング成形方法。 S1) A low-temperature austenitizing heating step in which the processed ring blank is placed in a heating furnace, heated to a temperature slightly higher than the critical temperature Ac 1 of the material and held for 5 to 10 minutes,
S2) In-furnace slow cooling step of gradually cooling the ring blank after heat retention to a temperature slightly lower than the critical temperature Ar 1 of the material in the heating furnace at a cooling rate of 100° C./h to 200° C./h,
S3) a warm rolling forming step of rapidly transferring the cooled ring blank from the heating furnace to a ring rolling mill and rolling at a deformation amount of 40% to 70% and a finish rolling temperature of Ar 1 or less and 100°C or less. ,
A method of forming a warm-rolled ring of high-carbon chromium bearing steel having a spheroidized structure, which is characterized in that.
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| CN109797274B (en) * | 2019-01-31 | 2020-08-04 | 武汉理工大学 | Temperature-thermal composite deformation spheroidizing method for high-carbon chromium steel bearing ring |
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