JPS6164812A - Production of steel parts for vehicle - Google Patents
Production of steel parts for vehicleInfo
- Publication number
- JPS6164812A JPS6164812A JP18487384A JP18487384A JPS6164812A JP S6164812 A JPS6164812 A JP S6164812A JP 18487384 A JP18487384 A JP 18487384A JP 18487384 A JP18487384 A JP 18487384A JP S6164812 A JPS6164812 A JP S6164812A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- tempering
- stage
- hardened
- restrained
- 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.)
- Granted
Links
Classifications
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Abstract
Description
【発明の詳細な説明】
〔発明の技術分−野〕
本発明は、例えば自動車用スタビライザやコイルばね、
トーションバーなどの車両用鋼製部品を製造する方法に
関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to, for example, automobile stabilizers, coil springs,
The present invention relates to a method of manufacturing steel parts for vehicles such as torsion bars.
従来、自動車用スタビライザを製造する方法がいくつか
知られている。その一つとして、例えば材料を所定のス
タビライザ形状に曲げ成形したのちに、炉加熱による焼
入れを行ない、次いで炉によって焼戻しを行なう方法が
ある。しかしこの方法では、■加熱中あるいは焼入れ時
に変形が生じるために矯正工程が必要である。■加熱中
にスケールの発生による肌荒れや脱炭が生じるため、疲
労強度が低下する。■設備が人身りとなり設備費も高く
つく。Conventionally, several methods of manufacturing automobile stabilizers are known. One such method is, for example, to bend and form a material into a predetermined stabilizer shape, then quench it by heating in a furnace, and then temper it in a furnace. However, this method requires a straightening step because (1) deformation occurs during heating or quenching. ■Fatigue strength decreases due to rough skin and decarburization due to scale formation during heating. ■Equipment becomes labor intensive and equipment costs are also high.
一方、別の従来方法として、材料を曲げ成形したのちに
通電加熱による急速加熱・焼入れを行ない、次いで炉に
よって焼戻しを行なう方法もある。On the other hand, as another conventional method, there is a method in which the material is bent and formed, then rapidly heated and quenched by electrical heating, and then tempered in a furnace.
しかしながらこの方法においても、■焼入れ時に変形が
生じるため矯正工程が必要、■通電加熱時に曲げ部の内
側に電流が多く流れ、過熱による結晶粒粗大化および脱
炭、肌荒れが生じるために、疲労強度が低下することが
ある。However, even with this method, a straightening process is required because deformation occurs during quenching, and large current flows inside the bent part during electrical heating, causing crystal grain coarsening, decarburization, and rough skin due to overheating, resulting in fatigue strength. may decrease.
更に別の従来方法として、曲げ成形前に焼入れを行ない
、焼入れ後に一旦焼戻すかまたは焼入れ状態のまま曲げ
成形を行ない、最後に低温焼鈍を行なう方法もある。し
かしながらこの方法においても次のような問題がある。Still another conventional method is to perform quenching before bending, temper once after quenching, or perform bending in the quenched state, and finally perform low-temperature annealing. However, this method also has the following problems.
■曲げ成形後は曲げ部の内側（中立線より内側）に引張
りの残留応力が、また外側には圧縮の残留応力が生じる
が、これらの残留応力を充分に解放するためには焼鈍（
または焼戻しンの温度を高くしなければならず、このた
め硬さの上限すなわち疲労強度の上限が限定されてしま
う。特にスタどライザは使用中に曲げの内側（中立線よ
り１５〜３０°内側の位置）の応力が最も大きいから、
この部分に引張り残留応力があると疲労強度が著しく低
下する。■After bending, tensile residual stress occurs on the inside of the bent part (inside the neutral line), and compressive residual stress occurs on the outside, but in order to sufficiently release these residual stresses, annealing (
Alternatively, the tempering temperature must be increased, which limits the upper limit of hardness, that is, the upper limit of fatigue strength. In particular, when using a stud riser, the stress is greatest on the inside of the bend (position 15 to 30 degrees inside the neutral line).
If there is tensile residual stress in this part, the fatigue strength will drop significantly.
■焼鈍（または焼戻し）時における残留応力の解放によ
るスプリングバック量が必ずしも一定していないため形
状のばらつきが大きく、従って矯正工程が必要な場合も
有りうる。(2) The amount of springback due to the release of residual stress during annealing (or tempering) is not necessarily constant, resulting in large variations in shape, and therefore a straightening process may be necessary.
本発明は上記事情に基づきなされたものでその目的とす
るところは、矯正工程が不要でありかつ優れた疲労強度
を発揮する車両用鋼製部品の製造方法を提供することに
ある。The present invention has been made based on the above circumstances, and its purpose is to provide a method for manufacturing steel parts for vehicles that does not require a straightening process and exhibits excellent fatigue strength.
本発明の要旨とするところは、焼入れ可能な所定長さの
鋼棒または＃ｌ管を、通電加熱あるいは高周波加熱等に
よる急速加熱・焼入れを行ない、そののち一旦焼戻すか
または焼入れ状態のまま曲げ成形を行ない、その後に成
形品を拘束した状態で通電加熱により拘束通電焼戻しく
または焼鈍）を行なうことにある。The gist of the present invention is to rapidly heat and harden a hardenable steel rod or #l pipe of a predetermined length by electrical heating or high-frequency heating, and then temporarily temper it or bend it in the hardened state. The method involves forming the molded product, and then subjecting the molded product to electrical heating in a restrained state to subject it to restrained electrical tempering (or annealing).
本発明においては、通電加熱あるいは高周波加熱等によ
る急速加熱・焼入れを行なうことで、炉加熱の場合に見
られるスケールや脱炭の発生を解決でき、また曲げ加工
前に定尺の鋼棒または鋼管を通電加熱によって焼入れす
ることで、成形後に炉あるいは通電加熱で焼入れする場
合に見られるような炉加熱中の変形や曲げ内側の電流過
多による過熱を防止できる。更に、曲げ成形後に拘束通
電焼戻しくないし焼鈍）を行なうことで、炉によるひず
み取り焼鈍（または焼戻し）時に見られる形状のばらつ
きを解決でき、しかも炉で焼鈍（または焼戻し）する場
合や、高周波加熱で焼戻し後、曲げ成形する場合に比べ
、硬さの上限を高くても曲げ内側の引張り残留応力を解
放することができる。従って従来のものに比べて疲労強
度が高く、しかも従来必要としていた矯正工程が不要と
なる。In the present invention, by performing rapid heating and quenching using electrical heating or high-frequency heating, it is possible to solve the problem of scale and decarburization that occurs when heating in a furnace. By quenching by electrical heating, it is possible to prevent deformation during furnace heating and overheating due to excessive current on the inside of the bend, which occurs when quenching is performed in a furnace or electrical heating after forming. Furthermore, by performing restraint current tempering or annealing after bending, it is possible to solve the shape variations that occur during strain relief annealing (or tempering) in a furnace. Compared to the case of bending after tempering, the tensile residual stress on the inside of the bend can be released even if the upper limit of hardness is higher. Therefore, the fatigue strength is higher than that of the conventional one, and the straightening process that was conventionally required is not required.
（実施例１） Ｑ、２５％Ｃの電縫管（Ｓ Ｔ Ｋ
Ｍ １５Ａ相当材）を用いて、第１図に示される工程を
経て中空スタビライザを製造する。まず加熱工程１０に
おいては、所定長さの直管状の上記材料を通電加熱によ
って９５０℃まで急速加熱する。加熱速度は、結晶粒の
粗大化と脱炭を防止する上で３０℃／秒以上が望ましい
。通電加熱は材料の両端を電極でクランプし、急速加熱
によりオルステナイト化させる。(Example 1) Q, 25% C electric resistance welded tube (S T K
A hollow stabilizer is manufactured using a material (equivalent to M15A) through the steps shown in FIG. First, in the heating step 10, the above-mentioned material in the shape of a straight tube having a predetermined length is rapidly heated to 950° C. by electrical heating. The heating rate is desirably 30° C./second or higher in order to prevent coarsening of crystal grains and decarburization. In electrical heating, both ends of the material are clamped with electrodes, and rapid heating transforms the material into orstenite.
こうして加熱された材料は、オーステナイト化された直
後に冷却工程１１において焼入れ時の曲りが発生しない
ように、水冷ジャケットと拘束ローラが配置された冷却
ゾーンの中で移動しつつ水焼入れが行なわれる。かくし
て、結晶粒が非常に微細でかつ脱炭がなく、スケール発
生の極めて少ない加工性に優れた焼入れ材が得られる。Immediately after the material is austenitized, it is water-quenched in a cooling step 11 while moving in a cooling zone in which a water-cooling jacket and constraint rollers are arranged to prevent bending during quenching. In this way, a hardened material with very fine crystal grains, no decarburization, very little scale formation, and excellent workability can be obtained.
次に成形工程１２において、上記焼入れ材は焼入れ状態
のままスタビライザ形状に曲げられる。Next, in a forming step 12, the hardened material is bent into a stabilizer shape while still in the hardened state.
曲げ成形はたとえばロータリーベンダによって冷間で行
なわれる。The bending is performed cold, for example with a rotary bender.
更に拘束通電焼戻し工程１３において、上記成形品の両
端部を、電極を兼ねたクランプ部材で拘束し、４００℃
で通電加熱焼戻しを行なう。この詩、成形品の曲げ部の
内側は電気抵抗が小さいために曲げの外側に比べて大き
な電流が流れ、従って曲げの内側暎外側よりも温度が高
くなる。Furthermore, in a restraint energization tempering step 13, both ends of the molded product are restrained with clamp members that also serve as electrodes, and heated to 400°C.
Electrification heating and tempering is performed. In this case, the inside of the bent part of the molded product has lower electrical resistance, so a larger current flows than the outside of the bend, and therefore the temperature inside the bend is higher than the outside.
第２図は、焼入れ状態で曲げ成形後、次表１に示す残留
応力を示す試料につき拘束通電焼戻しを４００℃に加熱
した場合と、４５０℃に加熱した場合の硬さ分布を示し
ている。同図において、横軸にとられている曲げ内側か
らの角度αとは、第３図に示されるように曲げ中心Ｃ側
の最内側からの円周方向の位置を示している。FIG. 2 shows the hardness distribution when the sample was bent and formed in the quenched state and showed the residual stress shown in Table 1 below, when the sample was subjected to restraint electric tempering and heated to 400°C and when it was heated to 450°C. In the figure, the angle α from the inside of the bending axis taken on the horizontal axis indicates the position in the circumferential direction from the innermost side on the side of the bending center C, as shown in FIG.
表 １
第２図に示されるように、４００℃で拘束通電焼戻しを
行なった場合、最小硬さはＨＲＯ４１と高く、しかも曲
げ内側の残留応力は、曲げ成形時にプラスであったもの
がマイナスつまり圧縮の残留応力となっている。すなわ
ち、従来方法（焼入れ後または焼入れ・焼戻し後に曲げ
成形を行ない、通電加熱による焼戻しを行なわない方法
）では疲労強度に悪影響を及ぼす曲げ内側の引張り残留
応力を解放するために硬さを下げざるをえなかったが、
本実施例によれば従来方法では不可能であった高い硬さ
で曲げ内側の引張り残留応力を圧縮残留応力に変えるこ
とが可能となり、疲労強度向上に大きな効果を発揮する
。Table 1 As shown in Figure 2, when restrained electric tempering is performed at 400℃, the minimum hardness is as high as HRO41, and the residual stress on the inside of the bend, which was positive during bending, becomes negative, that is, compressive. The residual stress is . In other words, in the conventional method (a method in which bending is performed after quenching or after quenching and tempering, and no tempering by energized heating is performed), the hardness has to be lowered in order to release the tensile residual stress on the inside of the bend, which has a negative effect on fatigue strength. I couldn't get it, but
According to this embodiment, it is possible to convert the tensile residual stress on the inner side of bending into compressive residual stress with a high degree of hardness that was not possible with conventional methods, and it is highly effective in improving fatigue strength.
第８図に、従来方法を用いた場合の焼戻し温度と曲げ部
の硬さ分布を示す。ここで言う従来方法とは、（加熱→
焼入れ→曲げ加工→炉による焼戻し）を行なう場合であ
る。同第８図からも知れるように、炉による焼戻しの場
合には、曲げ成形時に生じた残留応力を充分に解放する
（σｒが０またはマイナスになる）ためには、少なくと
も４２５℃ないし４５０℃×３０分の焼戻しを実施する
必要があり、この場合材料の最小硬さはＨＲｃ３１〜３
５とかなり低くなる。従って耐久性が低下する。また従
来の方法で曲げ部の硬さを高くするために焼戻し温度を
低くするとスタビライザの最大主応力が最も大きくなる
のは、曲げ部の最内側から円周方向に６０″ないし９０
°の位置であり、この部分に有害な引張り残留応力が存
在し疲労強度の低下をもたらす。FIG. 8 shows the tempering temperature and hardness distribution of the bent portion when the conventional method is used. The conventional method mentioned here is (heating→
This is the case when the process is performed (quenching → bending → tempering in a furnace). As can be seen from Fig. 8, in the case of furnace tempering, in order to sufficiently release the residual stress generated during bending (σr becomes 0 or negative), it is necessary to at least 425°C to 450°C x It is necessary to carry out tempering for 30 minutes, in which case the minimum hardness of the material is HRc31-3
5, which is quite low. Therefore, durability decreases. Furthermore, when using the conventional method to lower the tempering temperature to increase the hardness of the bending part, the maximum principal stress of the stabilizer becomes greatest at 60" to 90" in the circumferential direction from the innermost part of the bending part.
degree, and harmful tensile residual stress exists in this area, resulting in a decrease in fatigue strength.
しかして本実施例によれば、上述したように（第２図参
照）従来方法では不可能であった高い硬さで曲げ内側を
圧縮残留応力に転換することができるものである。この
ような現象は、曲げの外側と内側の温度差による変形抵
抗の差および熱応力の発生、戻し変態の進行による残留
応力の解放、ならびに焼戻し時のクランプ冶具による拘
束量などが互いに影響し合いながら作用するためと考え
られる。なお、焼戻し温度が３００℃未満になると、曲
げ加工時のひずみを充分に除去できなくなり、また７０
０℃を超えると材料が柔らかくなり過ぎて充分な疲労強
度が得られなくなる。よって拘束通電焼戻しの温度は３
００℃ないし７００℃の間にすることが望ましい。According to this embodiment, as described above (see FIG. 2), it is possible to convert the inner side of the bend into compressive residual stress with a high degree of hardness that was impossible with the conventional method. This phenomenon is caused by the mutual influence of the difference in deformation resistance and the generation of thermal stress due to the temperature difference between the outside and inside of the bend, the release of residual stress due to the progress of back transformation, and the amount of restraint by the clamp jig during tempering. This is thought to be due to the fact that it acts while Note that if the tempering temperature is less than 300°C, it will not be possible to sufficiently remove strain during bending, and
If the temperature exceeds 0°C, the material becomes too soft and sufficient fatigue strength cannot be obtained. Therefore, the temperature of restrained current tempering is 3
The temperature is preferably between 00°C and 700°C.
また、第２図と第８図とを比較して判るように、本発明
を用いた場合には曲げ内側（α−〇〜９０°）における
硬さの差がＨＲＣで２以内と少なく、分布の勾配も緩や
かである。これに対して従来法によるものは、硬さ分布
が急激に低下する箇所がある。Furthermore, as can be seen by comparing Fig. 2 and Fig. 8, when the present invention is used, the difference in hardness on the inside side of bending (α-〇~90°) is as small as within 2 in HRC, and the distribution The slope is also gentle. On the other hand, in the case of the conventional method, there are places where the hardness distribution suddenly decreases.
硬さ分布の急激な変化は、切欠感受性を高める原因とな
り、疲労強度に悪影響を及ぼす。この点、本発明によれ
ば、上記したように曲げ内側の硬さがほぼ均一となるこ
とにより、疲労強度に更に好影響を与えるものである。Sudden changes in hardness distribution cause increased notch sensitivity and have a negative impact on fatigue strength. In this regard, according to the present invention, as described above, the hardness on the inner side of the bending becomes substantially uniform, which has a further favorable effect on the fatigue strength.
しかも本発明では、拘束状態での通電焼戻しによりスタ
ビライザ形状のばらつきを非常に小ざなものにすること
ができ、従来方法では不可欠であった矯正工程を省略す
ることができる。Moreover, according to the present invention, variations in the shape of the stabilizer can be made very small by conducting electric tempering in a restrained state, and the straightening process that is essential in the conventional method can be omitted.
次表２に、実施例１により製造したスタビライザと従来
方法により製造したスタビライザの疲労試験結果を示し
ている。Table 2 below shows the fatigue test results of the stabilizer manufactured according to Example 1 and the stabilizer manufactured by the conventional method.
ここで従来方法１とは、（曲げ成形→通電加熱焼入れ→
炉による焼戻し）を行なう場合であり、また従来方法２
とは（加熱焼入れ→曲げ成形→炉による焼戻し）を行な
う場合である。Here, conventional method 1 is (bending forming → electric heating quenching →
This is a case where conventional method 2 is used.
This is the case when (heating and quenching → bending → tempering in a furnace) is performed.
また次表３に、従来方法２によるものと実施例１による
ものとのスタビライザのスパンＳ（第４図参照）の変化
を示している。Further, Table 3 below shows changes in the span S (see FIG. 4) of the stabilizer between the conventional method 2 and the stabilizer according to the first embodiment.
表 ３
（実施例２） 第５図に示されるように、拘束通電焼戻
し工程１３の次に、炉による焼戻し工程１４を付加する
。それ以外は実施例１と同様である。Table 3 (Example 2) As shown in FIG. 5, a tempering step 14 using a furnace is added next to the restrained current tempering step 13. The rest is the same as in Example 1.
第６図はこの方法による硬さの変化を示している。FIG. 6 shows the change in hardness due to this method.
炉による焼戻しを付加すると、曲げ外側の硬さを下げる
ことができるとともに曲げ外側の引張り残留応力の解放
に効果がある。しかも炉による焼戻し条件を適当に設定
することにより、曲げ内側の硬さおよび残留応力をほと
んど変えることなく硬さの規格値を満足させることがで
きる。Adding furnace tempering can reduce the hardness of the outside of the bend and is effective in releasing tensile residual stress on the outside of the bend. Moreover, by appropriately setting the tempering conditions in the furnace, the standard value of hardness can be satisfied without substantially changing the hardness and residual stress on the inside of the bend.
（実施例３） 焼入れ可能な材料として５ＵＰ９（Ｃ：
０，５５． Ｓ ｉ ：（ｉ、２５． Ｍｎ ：０，８
５． Ｃｒ ：０．８５）を使用する。このように炭素
量が多くなると材料強度が高くなり、焼入れ後の曲げ成
形が困難になる。よって本実施例においては、焼入れ後
に通電加熱により一次焼戻し工程１５を行ない、その後
に曲げ成形を行なうものとする。それ以外の点は実施例
１と同様である。第７図に工程を示す。(Example 3) 5UP9 (C:
0,55. S i :(i, 25. Mn : 0,8
5. Cr: 0.85) is used. When the amount of carbon increases in this way, the material strength increases and bending after quenching becomes difficult. Therefore, in this embodiment, after quenching, a primary tempering step 15 is performed by electrical heating, and then bending is performed. The other points are the same as in the first embodiment. Figure 7 shows the process.
この実施例３では、曲げ内側の硬さが一次焼戻し工程１
５よりも拘束通電焼戻し工程１３で低下するようにする
ことで、実施例１で述べたと同様の効果を得ることがで
きる。なお、−次焼戻しを行なう温度は１００〜５００
℃がよい。In this Example 3, the hardness on the inside of the bend was
The same effect as described in Example 1 can be obtained by making it lower in the restrained energization tempering step 13 than in Example 5. In addition, the temperature for performing the second tempering is 100 to 500℃.
℃ is better.
なお本発明は、スタビライザ以外にコイルばねやトーシ
ョンバーなどにも適用が可能である。また材料は鋼棒（
中実）、鋼管（中空）のいずれにも適用できる。また、
必要に応じて拘束通電焼戻し工程１３後にショットピー
ニングを行なってもよい。Note that the present invention can be applied not only to stabilizers but also to coil springs, torsion bars, and the like. Also, the material is steel rod (
It can be applied to both solid (solid) and steel pipes (hollow). Also,
If necessary, shot peening may be performed after the restrained current tempering step 13.
前述したように本発明によれば、車両用鋼製部品を製造
するに際して矯正工程が不要となり、しかも疲労強度の
高い車両用鋼製部品を得ることができる。As described above, according to the present invention, there is no need for a straightening process when manufacturing steel parts for vehicles, and steel parts for vehicles with high fatigue strength can be obtained.
第１図は本発明方法の一実施例を示す工程説明図、第２
図は第１図の工程で製造されたスタビライザの硬さ分布
を示す図、第３図は曲げ内側からの角度を示す端面図、
第４図はスタビライザのスパンを示す平面図、第５図は
本発明方法の他の実施例を示す工程説明図、第６図は第
５図の工程を採用した場合の硬さ分布を示す図、第７図
は本発明方法の更に別の実施例を示す工程説明図である
。
第８図は従来方法による硬さ分布を示す図である。
出願人代理人 弁理士 鈴江武彦
第４図
第５図
第６図
曲げ内＜ｅｓ゛Ｓの′ｉ４彦ｄ （６３）第７図
第８図Fig. 1 is a process explanatory diagram showing one embodiment of the method of the present invention;
The figure is a diagram showing the hardness distribution of the stabilizer manufactured by the process of Figure 1, Figure 3 is an end view showing the angle from the inside of bending,
Fig. 4 is a plan view showing the span of the stabilizer, Fig. 5 is a process explanatory drawing showing another embodiment of the method of the present invention, and Fig. 6 is a diagram showing the hardness distribution when the process of Fig. 5 is adopted. , FIG. 7 is a process explanatory diagram showing still another embodiment of the method of the present invention. FIG. 8 is a diagram showing the hardness distribution according to the conventional method. Applicant's agent Patent attorney Takehiko Suzue Figure 4 Figure 5 Figure 6 Bend <es゛S'i4hikod (63) Figure 7 Figure 8
Claims (4)
加熱あるいは高周波加熱等による急速加熱・焼入れを行
ない、そののち一旦焼戻すかまたは焼入れ状態のまま曲
げ成形を行ない、その後に成形品を拘束した状態で通電
加熱により拘束通電焼戻しを行なうことを特徴とする車
両用鋼製部品の製造方法。(1) A hardenable steel rod or steel pipe of a predetermined length is rapidly heated and hardened by electrical heating or high-frequency heating, and then tempered once or bent and formed in the hardened state, and then a molded product is formed. 1. A method for manufacturing steel parts for vehicles, characterized in that restraint energization tempering is performed by energization heating in a restrained state.
特徴とする特許請求の範囲第１項記載の車両用鋼製部品
の製造方法。(2) The method for manufacturing a steel part for a vehicle according to claim 1, wherein the steel part for a vehicle is a stabilizer.
００℃としたことを特徴とする特許請求の範囲第１項記
載の車両用鋼製部品の製造方法。(3) The heating temperature for the above-mentioned restrained current tempering is set to 300 to 7
The method for manufacturing steel parts for a vehicle according to claim 1, wherein the temperature is 00°C.
焼戻しを行なうことを特徴とする特許請求の範囲第１項
記載の車両用鋼製部品の製造方法。(4) The method for manufacturing steel parts for vehicles as set forth in claim 1, characterized in that after the above-mentioned restrained energization tempering, tempering is performed in a furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18487384A JPS6164812A (en) | 1984-09-04 | 1984-09-04 | Production of steel parts for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18487384A JPS6164812A (en) | 1984-09-04 | 1984-09-04 | Production of steel parts for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6164812A true JPS6164812A (en) | 1986-04-03 |
| JPH0561324B2 JPH0561324B2 (en) | 1993-09-06 |
Family
ID=16160803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18487384A Granted JPS6164812A (en) | 1984-09-04 | 1984-09-04 | Production of steel parts for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6164812A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008510070A (en) * | 2004-08-18 | 2008-04-03 | ビショップ イノヴェーション リミテッド | Method for producing hardened forged steel member |
| JP2011195921A (en) * | 2010-03-23 | 2011-10-06 | Nhk Spring Co Ltd | Method for heat treatment of coiled spring |
| WO2012014672A1 (en) * | 2010-07-26 | 2012-02-02 | 中央発條株式会社 | Method for manufacturing spring and device for heating by passage of electric current |
| WO2013146274A1 (en) * | 2012-03-28 | 2013-10-03 | 中央発條株式会社 | Heating device and heating method |
| JPWO2013099821A1 (en) * | 2011-12-26 | 2015-05-07 | 中央発條株式会社 | Spring manufacturing method and spring |
| WO2019012698A1 (en) * | 2017-07-14 | 2019-01-17 | 日本発條株式会社 | Stabilizer for vehicle, and shot peening jig for stabilizer |
| EP3279015A4 (en) * | 2015-03-23 | 2019-03-13 | Nhk Spring Co., Ltd. | Stabilizer and method for manufacturing same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342112A (en) * | 1976-08-18 | 1978-04-17 | Mo Abutomobirunii Zabuodo Im I | Method and apparatus for production of steel spring plate |
-
1984
- 1984-09-04 JP JP18487384A patent/JPS6164812A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342112A (en) * | 1976-08-18 | 1978-04-17 | Mo Abutomobirunii Zabuodo Im I | Method and apparatus for production of steel spring plate |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008510070A (en) * | 2004-08-18 | 2008-04-03 | ビショップ イノヴェーション リミテッド | Method for producing hardened forged steel member |
| JP2011195921A (en) * | 2010-03-23 | 2011-10-06 | Nhk Spring Co Ltd | Method for heat treatment of coiled spring |
| WO2012014672A1 (en) * | 2010-07-26 | 2012-02-02 | 中央発條株式会社 | Method for manufacturing spring and device for heating by passage of electric current |
| CN103025897A (en) * | 2010-07-26 | 2013-04-03 | 中央发条株式会社 | Method for manufacturing spring and device for heating by passage of electric current |
| US9623475B2 (en) | 2010-07-26 | 2017-04-18 | Chuo Hatsujo Kabushiki Kaisha | Method for producing spring |
| JP5865246B2 (en) * | 2010-07-26 | 2016-02-17 | 中央発條株式会社 | Spring manufacturing method and electric heating apparatus |
| JPWO2013099821A1 (en) * | 2011-12-26 | 2015-05-07 | 中央発條株式会社 | Spring manufacturing method and spring |
| JP2013204092A (en) * | 2012-03-28 | 2013-10-07 | Chuo Spring Co Ltd | Heating apparatus and heating method |
| WO2013146274A1 (en) * | 2012-03-28 | 2013-10-03 | 中央発條株式会社 | Heating device and heating method |
| EP3279015A4 (en) * | 2015-03-23 | 2019-03-13 | Nhk Spring Co., Ltd. | Stabilizer and method for manufacturing same |
| US10358012B2 (en) | 2015-03-23 | 2019-07-23 | Nhk Spring Co., Ltd. | Stabilizer and method for manufacturing same |
| WO2019012698A1 (en) * | 2017-07-14 | 2019-01-17 | 日本発條株式会社 | Stabilizer for vehicle, and shot peening jig for stabilizer |
| US11059344B2 (en) | 2017-07-14 | 2021-07-13 | Nhk Spring Co., Ltd. | Stabilizer for vehicle, and shot peening jig for stabilizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0561324B2 (en) | 1993-09-06 |
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