JPH0575525B2 - - Google Patents
Info
- Publication number
- JPH0575525B2 JPH0575525B2 JP3242486A JP3242486A JPH0575525B2 JP H0575525 B2 JPH0575525 B2 JP H0575525B2 JP 3242486 A JP3242486 A JP 3242486A JP 3242486 A JP3242486 A JP 3242486A JP H0575525 B2 JPH0575525 B2 JP H0575525B2
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- temperature
- tempering
- roll
- hardening heat
- 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.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 40
- 238000005496 tempering Methods 0.000 claims description 34
- 238000007747 plating Methods 0.000 claims description 28
- 239000002131 composite material Substances 0.000 claims description 22
- 229910018104 Ni-P Inorganic materials 0.000 claims description 19
- 229910018536 Ni—P Inorganic materials 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000005498 polishing Methods 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
- Electroplating Methods And Accessories (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
（産業上の利用分野）
本発明は、段ボール製造機のシングルフエーサ
ー用の段ロール、その他、高精度を要求される歯
車、ロール等の段付ロールにおいて、耐摩耗性向
上のために施されるNi−Ｐ複合メツキの硬化熱
処理時の変形を防止することに特徴を有する段ロ
ールの製造方法に関するものである。
（従来の技術）
シングルフエーサー用段ロールについて従来例
を説明すると、第２図に示すように上段ロール１
と下段ロール２および圧力ロール３等によつてシ
ングルフエーサーに構成され、上段ロール１と下
段ロール２間で中芯用紙ａが山型に成形されたの
ち、下段ロール２と圧力ロール３間でライナー紙
ｂが山型中芯用紙ａに糊付け加熱（約200℃）、加
圧過程を経て接着されて片面段ボールシートが製
造されるようになつているが、前記上、下段ロー
ルは、中芯用紙ａ中に含まれている異物（SiO2、
Al2Oなど）で摩耗されるため、第３図Ａ，Ｂに
示すように周面に高周波焼入れなどの硬化層７を
設け、さらにその表面にクロムメツキ６やNi−
Ｐ複合メツキ８などが施されている。
クロムメツキ６を施した前記段ロールは、第４
図に示すように素材ロール１０の山型荒加工１
１、高周波焼入れ１２、焼戻し１３ａ、山型仕上
げ研磨１４、クロムメツキ１５、さらに検査・他
１６の各工程順序で製造されており、前記硬化層
７は、耐摩耗性向上のみならず上、下段ロール
１，２間に入つて来ることがある0.5〜２mm径の
異物による山型の変形防止の役割を持つているた
め、できるだけ高い硬度が望ましいが、使用中の
寸法安定性を維持する必要があるため、該クロム
メツキを施工する段ロールでは、焼戻し１３は焼
戻し温度200℃×4HRの熱処理がなされている。
しかし、前記クロムメツキでは硬さがHv850〜
950程度のため紙質の悪化に伴ない段ロールの寿
命が著しく低下する。
SiCを分散したNi−Ｐ複合メツキを施した前記
段ロールは、前記欠点を改善するために開発され
たものであつて、第４図に示した製造工程のほか
に、第５図に示すように山型仕上げ研磨１４と検
査・他１６間に山型表面のNi−Ｐ複合メツキ１
７、硬化熱処理１８、修正研磨１９の各工程施工
を行つて製造するようになつていて、この場合の
焼戻し１３ｂは、硬化層７の硬さをできるだけ低
下させないため前記クロムメツキの際と同条件で
あり、一方、硬化熱処理１８は、Ni−Ｐ複合メ
ツキ８の硬さと硬化層７の硬さ低下を考え合せて
250〜500℃の硬化熱処理温度で選ばれている（第
６図参照）。前記工程で製造されたNi−Ｐ複合メ
ツキ施工の段ロールでは、焼戻し温度が200℃と
低いため硬化熱処理１８後に振れ（一軸方向の変
形）が発生し、修正研磨１９加工が必要となり、
この研磨加工はメツキ膜厚を薄くし寿命低下を招
くのみならず、メツキ膜の耐摩耗性が著しく良好
なため研磨加工に多大な工数を要しコスト増、工
期の増大を招いている。。
（発明が解決しようとする問題点）
SiCを分散させたNi−Ｐ複合メツキ施工の段ロ
ーラを第５図の工程で製造したところ、硬化熱処
理（400℃×10mm）後に表１に示すような振れ即
ち軸方向の曲がりが発生した。
(Industrial Application Field) The present invention is applied to corrugated rolls for single facers of corrugated board manufacturing machines, and other corrugated rolls such as gears and rolls that require high precision, in order to improve wear resistance. The present invention relates to a method for producing a corrugated roll, which is characterized by preventing deformation of Ni-P composite plating during hardening heat treatment. (Prior Art) To explain a conventional example of a single facer corrugating roll, as shown in Fig. 2, an upper corrugating roll 1
The core paper a is formed into a mountain shape between the upper roll 1 and the lower roll 2, and then between the lower roll 2 and the pressure roll 3. A single-sided corrugated board sheet is manufactured by adhering liner paper b to mountain-shaped core paper a through a process of gluing, heating (approximately 200°C), and applying pressure. Foreign matter contained in paper a (SiO 2 ,
As shown in Fig. 3A and B, a hardened layer 7 such as induction hardening is provided on the circumferential surface, and the surface is further coated with chrome plating 6 or Ni-
P composite plating 8 etc. are applied. The corrugated roll with chrome plating 6 is
As shown in the figure, chevron-shaped rough machining 1 of the material roll 10
1, induction hardening 12, tempering 13a, chevron finish polishing 14, chrome plating 15, and inspection/other 16 steps. It is desirable to have as high hardness as possible, as it has the role of preventing deformation of the mountain shape due to foreign objects with a diameter of 0.5 to 2 mm that may enter between 1 and 2, but it is necessary to maintain dimensional stability during use. Therefore, in the corrugated roll to which the chrome plating is applied, the tempering 13 is heat-treated at a tempering temperature of 200°C x 4HR.
However, the hardness of the chrome plating is Hv 850 ~
Since it is about 950, the life of the corrugating roll will be significantly reduced as the paper quality deteriorates. The corrugated roll with Ni-P composite plating in which SiC is dispersed was developed in order to improve the above-mentioned drawbacks, and in addition to the manufacturing process shown in FIG. The chevron finish polishing 14 and inspection, and the other 16 Ni-P composite plating on the chevron surface 1
7. It is manufactured by carrying out each step of hardening heat treatment 18 and corrective polishing 19. In this case, the tempering 13b is performed under the same conditions as the chrome plating described above in order to prevent the hardness of the hardened layer 7 from decreasing as much as possible. On the other hand, the hardening heat treatment 18 takes into account the hardness of the Ni-P composite plating 8 and the hardness reduction of the hardened layer 7.
It is selected for its curing heat treatment temperature of 250 to 500°C (see Figure 6). In the Ni-P composite plated corrugated roll manufactured in the above process, the tempering temperature was as low as 200°C, so runout (uniaxial deformation) occurred after the hardening heat treatment 18, and correction polishing 19 was required.
This polishing process not only reduces the thickness of the plating film and shortens the service life, but also requires a large number of man-hours for the polishing process because the plating film has extremely good wear resistance, resulting in increased costs and an increase in construction time. . (Problems to be Solved by the Invention) When a corrugated roller made of Ni-P composite plating with SiC dispersed was manufactured using the process shown in Fig. 5, after hardening heat treatment (400°C x 10 mm), the result was as shown in Table 1. Runout or axial bending occurred.
【表】
脱ロールをスムーズに運転するために前記振れ
は20μ以下にする必要があり、No.３のロールでは
修正研磨が必要となつたが、SiC微粒子（１〜
5μ）を分散させたNi−Ｐ複合メツキは極めて耐
摩耗性に優れているため、その修正研磨加工は極
めて困難となる。
前記振れの原因は、表１のように高周波焼入れ
後の振れ（第５図では山型仕上げ研磨で除去）と
密接な関係が見られることから、高周波焼入れ前
の素材ロールに存在した残留応力（高周波焼入れ
や焼戻しによつても一部は解放されているはずで
あるが、これによる振れは前述のように仕上げ研
磨で除去されている）や、高周波焼入れで生じる
軸対象の残留応力が、仕上げ研磨による除去によ
り、軸対象でなくなり、振れとなつて現われるも
のと思われる。残留応力の解放は、主として加熱
温度に影響される。
（問題点の解決手段）
本発明は、前記のような問題点に対処するため
の段ロールの製造方法であつて、素材の山型荒加
工、高周波焼入れ、焼戻し、山型仕上げ研磨、山
型表面のNi−Ｐ複合メツキ、および硬化熱処理
の各工程順序によりNi−Ｐをマトリツクスとす
る複合メツキを施工する段ロールの製造方法にお
いて、焼戻し温度250〜500℃範囲に高くして前記
焼戻しするとともに、硬化熱処理温度を焼戻し温
度とほぼ同じないし約150℃ほど低い範囲で硬化
熱処理することにより、硬化層の硬さを殆んど変
化させないで硬化熱処理後のロール振れを顕著に
減少し前記のような問題点を解消している。
（作用）
焼戻し温度を250℃〜500℃範囲に高くして焼戻
しすることにより、素材の残留応力が大幅に低減
されて硬化熱処理後の振れが顕著に減少され、硬
化熱処理温度を焼戻し温度とはほぼ同じないし
150℃ほど低い範囲で硬化熱処理することにより、
硬化層の硬さが殆んど変化されずに所望の硬度が
確保されて、硬化熱処理後の修正研磨工程が不必
要になつている。
（実施例）
第１図に本発明方法を実施するための工程を示
しており、素材ロール１０の山型荒加工１１、高
周波焼入れ１２、焼戻し２３、山型仕上げ研磨１
４、山型表面のNi−Ｐ複合メツキ１７、硬化熱
処理２８、および検査・他１６の各工程順序で
Ni−Ｐをマトリツクとする複合メツキを施工す
る段ロールの製造方法になつており、前記焼戻し
２３工程では、焼戻し温度250〜500℃範囲に高く
して焼戻しするとともに、前記硬化熱処理２８で
は、前記焼戻し温度とほぼ同じないし約150℃ほ
ど低い範囲で硬化熱処理するようにし、修正研磨
は実際上不必要になつている。
具体例 １
ロールの面長を2000mm、ロール径を300mmφ、
材質SCM440製の段ロールを、第１図に示す前記
製造方法で焼戻し温度400℃×1HRで焼戻しする
とともに、硬化熱処理温度400℃×10mmで硬化熱
処理して、膜厚100μのSiC分散Ni−Ｐ複合メツキ
を施工したロール３本を製造し、硬化熱処理後の
振れを測定したところ、表２のような結果が得ら
れた。[Table] In order to smoothly operate de-rolling, the run-out must be kept below 20 μm, and corrective polishing was required for roll No. 3.
Since the Ni-P composite plating in which 5μ) is dispersed has extremely excellent wear resistance, its correction polishing process is extremely difficult. As shown in Table 1, the cause of the runout is closely related to the runout after induction hardening (removed by chevron finish polishing in Figure 5). Some of it should have been released by induction hardening and tempering, but the runout caused by this was removed by final polishing as mentioned above), and the axially symmetrical residual stress generated by induction hardening is It is thought that due to removal by polishing, the axis is no longer symmetrical and this appears as runout. The release of residual stress is mainly influenced by the heating temperature. (Means for Solving the Problems) The present invention is a method for manufacturing corrugated rolls to solve the above-mentioned problems. In a method for manufacturing a corrugated roll in which composite plating is applied with Ni-P composite plating on the surface and composite plating with Ni-P as a matrix by each step sequence of hardening heat treatment, the tempering is performed at a high tempering temperature in the range of 250 to 500 ° C. By performing the hardening heat treatment at a temperature that is approximately the same as the tempering temperature or approximately 150°C lower than the tempering temperature, the roll runout after the hardening heat treatment is significantly reduced with almost no change in the hardness of the hardened layer, as described above. Problems have been resolved. (Function) By tempering at a high tempering temperature in the range of 250°C to 500°C, the residual stress of the material is significantly reduced and the runout after hardening heat treatment is significantly reduced, and the hardening heat treatment temperature is different from the tempering temperature. Not nearly the same
By performing hardening heat treatment at a temperature as low as 150℃,
The hardness of the hardened layer is hardly changed and the desired hardness is ensured, making a correction polishing step after the hardening heat treatment unnecessary. (Example) FIG. 1 shows the steps for carrying out the method of the present invention, including rough machining 11 of a material roll 10, induction hardening 12, tempering 23, finishing polishing 1 of a chevron shape.
4. Ni-P composite plating on the chevron-shaped surface 17, hardening heat treatment 28, and inspection/other 16 steps in order
This is a method for manufacturing a corrugated roll in which composite plating is applied using Ni-P as a matrix. Hardening heat treatment is now performed at a temperature that is approximately the same as the tempering temperature or approximately 150°C lower, making corrective polishing virtually unnecessary. Specific example 1 Roll surface length is 2000mm, roll diameter is 300mmφ,
A corrugated roll made of material SCM440 was tempered at a tempering temperature of 400°C x 1HR using the manufacturing method shown in Figure 1, and was also hardened at a hardening heat treatment temperature of 400°C x 10mm to form a SiC-dispersed Ni-P film with a thickness of 100μ. When three rolls with composite plating were manufactured and the runout after hardening heat treatment was measured, the results shown in Table 2 were obtained.
【表】
硬化熱処理後の振れが顕著に減少され、振れが
比較的に大きいものも15μ以内（目標20μ）に入
つており、修正研磨することなしに使用可能であ
る。
また、高周波焼入れによる硬化層の硬さは、表
１の場合と同様なHv480〜500の範囲内にあり殆
んど差が見られない。
具体例 ２
前記具体例１と同様な製造により焼戻し温度
425℃×1HRで焼戻しするとともに、硬化熱処理
温度375℃×30mmで硬化熱処理して、３本の段ロ
ールを製造して振れを測定したところ、表３のよ
うな結果が得られた。[Table] The runout after hardening heat treatment has been significantly reduced, and even those with relatively large runouts are within 15μ (target 20μ), and can be used without correction polishing. Further, the hardness of the hardened layer by induction hardening is within the same range of Hv 480 to 500 as in Table 1, and there is almost no difference. Specific Example 2 The tempering temperature was
Three corrugated rolls were manufactured by tempering at 425° C. x 1 HR and hardening heat treatment at a hardening heat treatment temperature of 375° C. x 30 mm, and the runout was measured, and the results shown in Table 3 were obtained.
【表】
前記具体例１に比較して、焼戻し温度をさらに
高くし硬化熱処理温度を低くした結果であり、振
れ防止効果が極めて大きく、この場合も硬化層の
硬さは、焼戻し温度の上昇により僅かに低下した
Hv＝440〜460にとどまり良好な結果が得られて
いる。
硬化熱処理後の振れ発生原因は、表１に示すよ
うに高周波焼入れ後の振れと密接な関係が見られ
るところから、高周波焼入れ前の素材ロールに存
在した残留応力や、高周波焼入れで生じる軸対象
の残留応力が仕上げ研磨による除去により軸対称
でなくなり、硬化熱処理では残留応力が解放され
振れになつて現われるものと思われ、前記残留応
力の解放は主として加熱温度に影響されるため、
焼戻し温度と硬化熱処理温度の関係を調査するた
めに、第５図の製造工程において硬化熱処理後の
振れと焼戻しの条件および硬化熱処理条件との関
係を調べたところ、焼戻し温度と硬化熱処理温度
の相対関係が最も影響していることが確認され
た。
即ち、焼戻し温度200℃に対し硬化熱処理温度
400℃のように高い場合は、表１のように硬化熱
処理後に大きい振れが発生するが、焼戻し温度を
前述のように高くしたことにより同振れが顕著に
減少され、硬化熱処理温度が焼戻し温度を越えな
い領域では硬化層７の硬さは殆んど変化しない。
（発明の効果）
本発明方法は、前記工程順序によりNi−Ｐを
マトリツクスとする複合メツキを施工する段ロー
ルの製造方法において、焼戻し温度250〜500℃範
囲に高めて焼戻しするとともに、硬化熱処理温度
を前記焼戻し温度とほぼ同じないし約150℃ほど
低い範囲で硬化熱処理することにより、硬化熱処
理後の振れ発生が顕著に減少されて修正研磨が実
際上不必要となり、しかも硬化層の硬さが殆んど
変化されないで確保され、工程の減少とともに
Ni−Ｐ複合メツキを薄くしないですみ、段ロー
ルの製造性能が著しく向上されているとともに、
段ロールの精度、性能の向上、寿命延長、製造コ
スト低減などの効果が得られ、精度向上に伴つて
ロール回転がスムーズになり騒音が低減されるな
どの効果が得られる。
以上本発明を実施例について説明したが、勿論
本発明はこのような実施例にだけ局限されるもの
ではなく、本発明の精神を逸脱しない範囲内で
種々の設計の改変を施しうるものである。[Table] This is the result of increasing the tempering temperature and lowering the hardening heat treatment temperature compared to Example 1, and the shake prevention effect is extremely large. In this case as well, the hardness of the hardened layer decreases due to the increase in tempering temperature. decreased slightly
Good results were obtained with H v =440 to 460. The causes of runout after hardening heat treatment are closely related to the runout after induction hardening as shown in Table 1, so the causes are the residual stress that existed in the material roll before induction hardening and the axial symmetry caused by induction hardening. It is thought that the residual stress is removed by final polishing and becomes axially symmetrical, and in the hardening heat treatment, the residual stress is released and appears as runout, and the release of the residual stress is mainly influenced by the heating temperature.
In order to investigate the relationship between tempering temperature and hardening heat treatment temperature, we investigated the relationship between runout after hardening heat treatment and tempering conditions and hardening heat treatment conditions in the manufacturing process shown in Figure 5, and found that the relationship between tempering temperature and hardening heat treatment temperature was Relationships were found to be the most influential. In other words, the hardening heat treatment temperature is 200℃ for the tempering temperature.
When the temperature is as high as 400℃, large runout occurs after the hardening heat treatment as shown in Table 1, but by increasing the tempering temperature as described above, the runout is significantly reduced, and the hardening heat treatment temperature is higher than the tempering temperature. The hardness of the hardened layer 7 hardly changes in the region where the hardness is not exceeded. (Effects of the Invention) The method of the present invention is a method for manufacturing a corrugated roll in which composite plating with Ni-P as a matrix is applied according to the above-mentioned process sequence, in which tempering is carried out at an elevated tempering temperature in the range of 250 to 500°C, and the hardening heat treatment temperature is By performing the hardening heat treatment at a temperature that is approximately the same as or approximately 150°C lower than the tempering temperature, the occurrence of runout after the hardening heat treatment is significantly reduced, making corrective polishing virtually unnecessary, and the hardness of the hardened layer is almost the same. It is ensured that it remains unchanged, and as the process decreases.
There is no need to thin the Ni-P composite plating, and the manufacturing performance of corrugated rolls has been significantly improved.
Effects such as improved accuracy and performance of corrugated rolls, extended lifespan, and reduced manufacturing costs can be obtained, and with improved accuracy, roll rotation becomes smoother and noise is reduced. Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .
第１図は本発明方法の一実施例を示す製造工程
図、第２図はシングルフエーサーの機構側視図、
第３図Ａはクロムメツキ施工段ロールの一部拡大
断面図、第３図ＢはNi−Ｐ複合メツキ施工段ロ
ールの一部拡大断面図、第４図は従来のクロムメ
ツキ施工段ロールの製造工程図、第５図はNi−
Ｐ複合メツキ施工段ロールの製造工程図、第６図
はNi−Ｐ複合メツキおよびSCM440高周波焼入れ
部の硬さ特性図である。
１，２：段ロール、１０：素材ロール、１１：
高周波焼入れ、２３：焼戻し、１４：山型仕上げ
研磨、１７：山型表面のNi−Ｐ複合メツキ、２
８：硬化熱処理。
Fig. 1 is a manufacturing process diagram showing an embodiment of the method of the present invention, Fig. 2 is a side view of the mechanism of a single facer,
Figure 3A is a partially enlarged sectional view of a chrome-plated corrugated roll, Figure 3B is a partially enlarged sectional view of a Ni-P composite plated corrugated roll, and Figure 4 is a manufacturing process diagram of a conventional chrome-plated corrugated roll. , Figure 5 shows Ni-
Fig. 6 is a manufacturing process diagram of a P composite plating corrugated roll, and a hardness characteristic diagram of the Ni-P composite plating and SCM440 induction hardened portion. 1, 2: Corrugated roll, 10: Material roll, 11:
Induction hardening, 23: Tempering, 14: Peak finish polishing, 17: Ni-P composite plating on the peak surface, 2
8: Hardening heat treatment.
Claims (1)
戻し、山型仕上げ研磨、山型表面のNi−Ｐ複合
メツキ、および硬化熱処理の各工程順序により
Ni−Ｐをマトリツクスとする複合メツキを施工
する段ロールの製造方法において、焼戻し温度
250〜500℃範囲で前記焼戻しするとともに、硬化
熱処理温度を前記焼戻し温度とほぼ同じないし約
150℃ほど低い範囲で前記硬化熱処理することを
特徴とする段ロールの製造方法。1. Depending on the order of the steps of rough machining of the material roll, induction hardening, tempering, finishing polishing of the chevron shape, Ni-P composite plating on the surface of the chevron shape, and hardening heat treatment.
In the manufacturing method of corrugated rolls in which composite plating is applied using Ni-P as a matrix, the tempering temperature
The above-mentioned tempering is performed in the range of 250 to 500°C, and the hardening heat treatment temperature is approximately the same as or about the same as the above-mentioned tempering temperature.
A method for manufacturing a corrugated roll, characterized in that the curing heat treatment is performed at a temperature as low as 150°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3242486A JPS62193730A (en) | 1986-02-17 | 1986-02-17 | Manufacture of stepped roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3242486A JPS62193730A (en) | 1986-02-17 | 1986-02-17 | Manufacture of stepped roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62193730A JPS62193730A (en) | 1987-08-25 |
| JPH0575525B2 true JPH0575525B2 (en) | 1993-10-20 |
Family
ID=12358569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3242486A Granted JPS62193730A (en) | 1986-02-17 | 1986-02-17 | Manufacture of stepped roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62193730A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2514953Y2 (en) * | 1989-10-23 | 1996-10-23 | 日産ディーゼル工業株式会社 | Mode switching device for four-wheel steering vehicle |
-
1986
- 1986-02-17 JP JP3242486A patent/JPS62193730A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62193730A (en) | 1987-08-25 |
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