JP3057611B2 - Induction hardening equipment for long objects such as ball screw shafts - Google Patents
Induction hardening equipment for long objects such as ball screw shaftsInfo
- Publication number
- JP3057611B2 JP3057611B2 JP3055544A JP5554491A JP3057611B2 JP 3057611 B2 JP3057611 B2 JP 3057611B2 JP 3055544 A JP3055544 A JP 3055544A JP 5554491 A JP5554491 A JP 5554491A JP 3057611 B2 JP3057611 B2 JP 3057611B2
- Authority
- JP
- Japan
- Prior art keywords
- quenched
- coil
- induction hardening
- ball screw
- cooler
- 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
Classifications
-
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ボールねじ軸等の高周
波焼入装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction hardening device for a ball screw shaft or the like.
【０００２】[0002]
【従来の技術】図２は、従来の高周波焼入装置３０であ
って、ボールねじ軸３２の入口側のコイル３４，３４と
出口側の冷却器３６とを有してなる。そして、コイル３
４に高周波電流を流し、コイル３４内に進入した被焼入
体３２に誘導電流を生じさせて加熱し、その後冷却器３
６によって急冷して、被焼入体３２の表層を焼入硬化さ
せるようになっている。2. Description of the Related Art FIG. 2 shows a conventional induction hardening device 30 in which coils 34, 34 on the inlet side of a ball screw shaft 32 are connected to each other.
And an outlet- side cooler 36. And coil 3
A high-frequency current is passed through the coil 4 to generate an induced current in the quenched body 32 that has entered the coil 34, thereby heating the quenched body 32.
6, the surface layer of the quenched body 32 is quenched and hardened.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術において
は、被焼入体３２が加熱後、冷却器３６に進入するまで
の間に、被焼入体３２の表面が著しく酸化し、そのた
め、肌荒れが起こるという問題、スケールが生じるとい
う問題があった。スケールはバフ研磨である程度除去で
きるが、肌荒れは、一度生じてしまうと、バフ研磨を行
ったとしても除去することができない。従って、このよ
うな酸化を防止する手段が必要である。特に、焼入後に
ねじ溝研磨等を施さない例えば転造ボールねじでは、ス
ケール及び肌荒れにより、ボールねじ軸の良好な回転精
度が得られないという問題がある。そこで、１つの解決
手段として、窒素ガス等の不活性ガス雰囲気下で焼入を
行う方法があるが、これは、大がかりな装置を必要と
し、不活性ガスを逐次供給しなければならないため非経
済的である。In the [0006] above-described prior art, after the baked inclusion bodies 32 is heated, until you enter the cooler 36, the surface of the baked inclusion bodies 32 is significantly oxidized, therefore, There is a problem that the skin becomes rough and a problem that the scale is formed. Scale can be removed to some extent by buffing
Kill, but the rough is, and would once generated, can not be to remove the buff Migaku Ken as was Tsu line <br/>. Therefore , means for preventing such oxidation is required. In particular, in a rolled ball screw which is not subjected to thread groove polishing or the like after quenching, there is a problem that good rotation accuracy of the ball screw shaft cannot be obtained due to scale and surface roughness. Therefore, as one solution, there is a method in which quenching is performed in an atmosphere of an inert gas such as nitrogen gas. However, this method requires a large-scale apparatus and requires an inert gas to be supplied one by one, which is not economical. It is a target.
【０００４】[0004]
【課題を解決するための手段】本発明は、被焼入体入口
側のコイルと出口側の冷却器とを有し、前記コイルの半
径方向内側に、前記被焼入体の断面形状と相補い合う断
面形状の中空部分を形成した環状の非磁性体が配置され
ている高周波焼入装置により前記課題を解決した。SUMMARY OF THE INVENTION The present invention comprises a coil on the inlet side of a quenched body and a cooler on the outlet side, and the inside of the coil in the radial direction is provided with the coil of the quenched body. The above object has been solved by an induction hardening device in which an annular non-magnetic material having a hollow portion having a sectional shape complementary to the sectional shape is arranged.
【０００５】[0005]
【作用】コイルに高周波電流が通電されると、被焼入体
は誘導電流によって昇温する。これにより、被焼入体は
約１０００℃にもなり、その周囲の空気はかなりの高温
になる。従って、被焼入体の周囲では、単位体積当りの
酸素量が少なくなる。本発明では、コイルと被焼入体と
の間に環状の非磁性体を配設したことにより、被焼入体
の周囲の空気は対流を抑止されて、極めて酸素が希薄な
雰囲気になる。その結果、被焼入体が高温に達しても、
その表面の酸化は防止される。なお、非磁性体は、絶縁
体であることが望ましい。その理由は、コイルと接触し
たときに短絡を防止するためである。また、被焼入体が
１０００℃にもなること、及び、昇温降温が反復して繰
り返されることから、非磁性体は、高温に耐え、温度変
化に耐える材料から製造されることが望ましい。さら
に、焼入中の被焼入体の状態を観察するために、環状の
非磁性体は透明であることが望ましい。これらの特徴を
兼ね備えたものが石英ガラスである。また、透明ではな
いが、その他の好適材料としてはセラミックがある。When a high frequency current is applied to the coil, the quenched body is heated by the induced current. Thus, HiyakiIri body Ri Na to <br/> about 1000 ° C., the ambient air is considerably high temperature
Ing to. Therefore, the amount of oxygen per unit volume around the quenched body is reduced. In the present invention, by arranging the annular non-magnetic material between the coil and the object to be quenched, convection of the air around the object to be quenched is suppressed, and the atmosphere becomes extremely lean in oxygen. As a result, even if the quenched body reaches a high temperature,
Oxidation of the surface is prevented. Note that the nonmagnetic material is preferably an insulator. The reason is to prevent a short circuit when coming into contact with the coil. In addition, since the quenched body reaches 1000 ° C. and the temperature is repeatedly increased and decreased, it is desirable that the non-magnetic material be manufactured from a material that can withstand high temperatures and withstand temperature changes. Furthermore, in order to observe the condition of the baked inclusion bodies in quenching, circular
Desirably, the non-magnetic material is transparent. That combines these features Ru quartz glass der. Also, it is not transparent
However , other suitable materials include ceramics.
【０００６】[0006]
【実施例】以下、図面を参照して本発明の実施例を説明
する。本発明による高周波焼入装置１０は、コイル１
４、冷却器１６、環状の非磁性体１８、及び遮蔽体２２
を有してなる。コイル１４及び冷却器１６は、従来（図
２）のものと差異がないのでここでは説明を省略する。
１２は被焼入体である。被焼入体の例として、ボールね
じ軸がある。Embodiments of the present invention will be described below with reference to the drawings. The induction hardening device 10 according to the present invention
4. Cooler 16, annular non-magnetic body 18, and shield 22
Having. Since the coil 14 and the cooler 16 are not different from those of the related art (FIG. 2), the description is omitted here.
Reference numeral 12 denotes a quenched body. An example of the material to be quenched is a ball screw shaft.
【０００７】遮蔽体２２は、コイル１４と冷却器１６と
の間に配置されている。遮蔽体２２は、被焼入体１２の
断面形状と相補い合う断面形状（この場合は円形）の孔
２４を有する。孔２４と被焼入体１２との間の隙間は極
小に保たれている。[0007] The shield 22 is disposed between the coil 14 and the cooler 16. The shield 22 has a hole 24 having a cross-sectional shape (circular in this case) complementary to the cross-sectional shape of the quenched body 12. The gap between the hole 24 and the quenched body 12 is kept very small.
【０００８】非磁性体１８は、コイル１４の半径方向内
側において、被焼入体１２と同心となるように配置され
ている。また、ボールねじ軸１２の直径より僅かに大き
い内径を有する。被焼入体１２が断面矩形のものであれ
ば、その断面に相補い合う断面形状の中空部分２０を有
する。非磁性体１８の軸方向長さは、最低限コイル１４
の幅より長く、出口側では遮蔽体２２の近傍まで伸張
し、入口側ではコイル１４の端からかなり長く延びてい
る。被焼入体１２、環状体１８及び遮蔽体２２で区切ら
れる空間２６は、環状体１８の被焼入体１２入口側を除
いて実質的に閉じており、このことは、空間２６内の空
気の対流が生じないことを意味する。The non-magnetic member 18 is disposed radially inward of the coil 14 so as to be concentric with the quenched member 12. Further, it has an inner diameter slightly larger than the diameter of the ball screw shaft 12. If the quenched body 12 has a rectangular cross section, it has a hollow portion 20 having a cross-sectional shape complementary to the cross section. The axial length of the non-magnetic body 18 is at least
Is extended to the vicinity of the shield 22 on the outlet side, and extends considerably longer from the end of the coil 14 on the inlet side. The space 26 defined by the quenched body 12, the annular body 18 and the shield 22 is substantially closed except for the inlet side of the quenched body 12 of the annular body 18, which means that the air in the space 26 to agree taste that convection does not occur.
【０００９】非磁性体１８は絶縁体であり、高温に耐え
うるとともに温度変化に耐える材料から製造され、無色
透明であることが望ましい。すなわち、コイル１４と接
触したときに短絡を防止すること、１０００℃の温度に
も耐えること、反復する昇温降温に耐えること、焼入中
の被焼入体１２の状態を観察できることが望ましい。こ
れらの特徴を兼ね備えたものが石英ガラスである。ま
た、透明ではないが、セラミックも利用することができ
る。The non-magnetic material 18 is an insulator, is made of a material that can withstand high temperatures and withstands temperature changes, and is desirably colorless and transparent. That is, it is desirable to prevent a short circuit when contacting the coil 14, to withstand a temperature of 1000 ° C., to withstand repeated heating and cooling, and to be able to observe the state of the quenched body 12 during quenching. Quartz glass has both of these features. Although not transparent, ceramic can also be used.
【００１０】入口側から被焼入体１２が装置内に進入し
てくると、非磁性体内部の空気が冷却器１６側に排出さ
れる。コイル１４に高周波電流が通され、被焼入体１２
には誘導電流が生じて加熱が行われる。加熱された被焼
入体１２は、次いで冷却器１６に進入し、噴出する冷却
水によって急冷されて焼入硬化する。焼入操作中、被焼
入体１２、環状体１８及び遮蔽体２２で区切られた空間
には空気自体が殆ど存在しないこと、被焼入体１２の輻
射熱により空気がかなりの高温になり単位体積当りの酸
素が希薄になること、空気の対流が防止されること等か
ら、被焼入体１２の表面は極めて酸化されにくくなる。
また、遮蔽体２２によって、冷却器１６から噴出する冷
却水の浸入が防止される。When the quenched body 12 enters the apparatus from the inlet side, the air inside the non-magnetic material is discharged to the cooler 16 side. A high-frequency current is passed through the coil 14 and the
, An induction current is generated and heating is performed. The heated quenched body 12 then enters the cooler 16 and is quenched and hardened by the jetted cooling water. During the quenching operation, there is almost no air in the space defined by the quenched body 12, the annular body 18 and the shielding body 22, and the radiant heat of the quenched body 12 causes the air to reach a considerably high temperature, resulting in a unit volume. The surface of the quenched body 12 is extremely unlikely to be oxidized, because the permeated oxygen is diluted and the convection of air is prevented.
Further, the shielding body 22 prevents the inflow of the cooling water ejected from the cooler 16.
【００１１】[0011]
【発明の効果】本発明では、環状の非磁性体をコイルの
半径方向内側に配置するという比較的簡単な構成によ
り、被焼入体の表面に酸素が介在することを抑制して、
被焼入体にスケールが生じること、及び、肌荒れが生じ
ることを最低限防止できる。そして、窒素等の不活性ガ
スを供給することが不要となり、比較的廉価に高周波焼
入装置を提供することができる。According to the present invention, a relatively simple structure in which an annular non-magnetic material is arranged radially inward of a coil suppresses oxygen from intervening on the surface of a material to be quenched.
It is possible to minimize the occurrence of scale on the quenched body and the occurrence of rough skin. In addition, it becomes unnecessary to supply an inert gas such as nitrogen, and the induction hardening apparatus can be provided at a relatively low cost.
【００１２】請求項２の高周波焼入装置では、遮蔽体が
冷却器からの冷却水の浸入を防止して焼きむら等の発生
を防止するとともに、被焼入体、遮蔽体及び環状の非磁
性体によって区切られた空間中の空気の対流が抑止さ
れ、一層効果的に被焼入体の酸化を防止することができ
る。In the induction hardening apparatus according to the second aspect, the shield prevents the infiltration of the cooling water from the cooler to prevent the occurrence of unevenness in the quenching. Convection of air in the space defined by the body is suppressed, and oxidation of the quenched body can be more effectively prevented.
【図１】本発明による高周波焼入装置の実施例を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of an induction hardening apparatus according to the present invention.
【図２】従来の高周波焼入装置を示す断面図である。FIG. 2 is a sectional view showing a conventional induction hardening apparatus.
１０ 高周波焼入装置 １２ 被焼入体（ボールねじ軸） １４ コイル １６ 冷却器 １８ 環状体 ２０ 中空部分 ２２ 遮蔽体 ２４ 円形孔 ２６ 空間 REFERENCE SIGNS LIST 10 induction hardening device 12 quenched object (ball screw shaft) 14 coil 16 cooler 18 annular body 20 hollow part 22 shield 24 circular hole 26 space
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/00 - 9/44 C21D 9/50 C21D 1/10 C21D 1/42 C21D 1/667 C21D 1/70 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) C21D 9/00-9/44 C21D 9/50 C21D 1/10 C21D 1/42 C21D 1/667 C21D 1 / 70
Claims (2)
器とを有し、前記コイルの半径方向内側に、前記被焼入
体の断面形状と相補い合う断面形状の中空部分を形成し
た環状の非磁性体が配置されていることを特徴とする、
高周波焼入装置。1. A hollow part having a cross-sectional shape complementary to a cross-sectional shape of the quenched object is formed inside the coil in a radial direction, the coil having a coil on the inlet side of the quenched object and a cooler on the outlet side. Characterized in that a ring-shaped non-magnetic material is arranged,
Induction hardening equipment.
被焼入体の断面形状と相補い合う形状の孔が形成された
遮蔽体を具え、前記非磁性体の一端が前記遮蔽体近傍に
ある、請求項１記載の高周波焼入装置。2. A shield having a hole formed between the coil and the cooler, the hole having a shape complementary to a cross-sectional shape of the object to be quenched, wherein one end of the non-magnetic member is in the vicinity of the shield. The induction hardening device according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3055544A JP3057611B2 (en) | 1991-02-28 | 1991-02-28 | Induction hardening equipment for long objects such as ball screw shafts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3055544A JP3057611B2 (en) | 1991-02-28 | 1991-02-28 | Induction hardening equipment for long objects such as ball screw shafts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04289123A JPH04289123A (en) | 1992-10-14 |
| JP3057611B2 true JP3057611B2 (en) | 2000-07-04 |
Family
ID=13001657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3055544A Expired - Lifetime JP3057611B2 (en) | 1991-02-28 | 1991-02-28 | Induction hardening equipment for long objects such as ball screw shafts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3057611B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3783122A4 (en) * | 2018-04-16 | 2021-11-10 | Nippon Steel Corporation | Induction hardening device |
| EP3783123A4 (en) * | 2018-04-16 | 2021-11-10 | Nippon Steel Corporation | Induction hardening device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2007002009A (en) * | 2004-08-18 | 2007-04-23 | Bishop Innovation Ltd | Method of manufacturing a hardened forged steel component. |
| JP2006233288A (en) * | 2005-02-25 | 2006-09-07 | Ntn Corp | Machine part with groove for rolling and production method therefor |
| JP5774871B2 (en) * | 2011-02-25 | 2015-09-09 | 株式会社ネツレン・ヒートトリート | Hardening equipment for bar workpiece |
| JP6437806B2 (en) * | 2014-12-04 | 2018-12-12 | 新日鐵住金株式会社 | Hardened steel manufacturing method |
-
1991
- 1991-02-28 JP JP3055544A patent/JP3057611B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3783122A4 (en) * | 2018-04-16 | 2021-11-10 | Nippon Steel Corporation | Induction hardening device |
| EP3783123A4 (en) * | 2018-04-16 | 2021-11-10 | Nippon Steel Corporation | Induction hardening device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04289123A (en) | 1992-10-14 |
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