JPH03119681A - Peripheral groove quenching device in cylinder - Google Patents
Peripheral groove quenching device in cylinderInfo
- Publication number
- JPH03119681A JPH03119681A JP25532389A JP25532389A JPH03119681A JP H03119681 A JPH03119681 A JP H03119681A JP 25532389 A JP25532389 A JP 25532389A JP 25532389 A JP25532389 A JP 25532389A JP H03119681 A JPH03119681 A JP H03119681A
- Authority
- JP
- Japan
- Prior art keywords
- heating conductor
- cylinder
- circumferential groove
- conductor portion
- 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.)
- Granted
Links
- 238000010791 quenching Methods 0.000 title claims abstract description 35
- 230000000171 quenching effect Effects 0.000 title claims abstract description 34
- 230000002093 peripheral effect Effects 0.000 title 1
- 238000010438 heat treatment Methods 0.000 claims abstract description 77
- 239000004020 conductor Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000012809 cooling fluid Substances 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims description 10
- 239000000696 magnetic material Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 230000007704 transition Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000007542 hardness measurement Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005255 carburizing Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- General Induction Heating (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は例えば中型ベアリングの外輪等として使用され
るが如き筒体のトラック、即ち内壁に形成されている周
回溝を誘導加熱手段を用いて一発焼入れする装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention uses induction heating means to heat the track of a cylindrical body, that is, the circumferential groove formed in the inner wall, such as the one used as the outer ring of a medium-sized bearing. This relates to a device for one-shot hardening.
（従来の技術と問題点）
大型ベアリングの外輪等の内周溝焼入れでは、周知の如
く、当該内周溝の所定位置に小さい１り〜ンの加熱コイ
ルを挿入し、溝内を相対移動で１周して加熱しつつ、加
熱コイルに追随する冷却ジャケットで被加熱部を順次急
冷する移動焼入れ手法が用いられている。(Conventional technology and problems) When hardening the inner circumferential groove of the outer ring of a large bearing, as is well known, one small heating coil is inserted at a predetermined position in the inner circumferential groove, and the heating coil is relatively moved within the groove. A moving hardening method is used in which the heated part is heated in one turn and then rapidly cooled in sequence with a cooling jacket that follows the heating coil.
ところが、中型の筒体内壁に形成された周回溝は溝の断
面積が小さいため、上記手法を用いようとしても加熱コ
イルの作成が困難なために適用不可能である。However, since the circumferential groove formed in the inner wall of a medium-sized cylinder has a small cross-sectional area, even if the above method is attempted, it is difficult to create a heating coil, so it is not applicable.
地方、誘導加熱手段を用いた一発焼入れ手法を採ろうと
しても以下に述べる不具合が生ずるため、これまで実施
されなかった。In rural areas, attempts to adopt a one-shot quenching method using induction heating means have not been implemented until now because the following problems occur.
即ち、第６図（ａ）に示す如（、誘導加熱コイルＣを筒
体Ｗ内に挿入する必要上、コイルＣの直径を筒体Ｗの内
径よりも小にしなければならないことに起因して、周回
溝Ｇの縁部のみが二重斜線りで表されるように急速に昇
温・加熱され、従って急冷・焼入れしても、肝要な底部
が焼入れされない。また、例えば加熱時間を長くする等
の処置によって２強いて底部表層所定焼入れ温度まで加
熱されるようにしたとしても、周回溝Ｇの縁部がオーバ
ヒート状態となるとともに、底部の後背部分は加熱温度
がなだらかに低下する状態となる。That is, as shown in FIG. 6(a), due to the necessity of inserting the induction heating coil C into the cylindrical body W, the diameter of the coil C must be made smaller than the inner diameter of the cylindrical body W. , only the edge of the circumferential groove G is rapidly raised and heated as shown by double diagonal lines, so even if it is rapidly cooled and quenched, the essential bottom part is not quenched.Also, for example, by increasing the heating time. Even if the bottom surface layer is heated to the predetermined quenching temperature by the above measures, the edge of the circumferential groove G will be overheated, and the heating temperature will gradually decrease in the rear part of the bottom.
それ故、急冷・焼入れしても、第６図（ｂ）に示す如く
１周回溝Ｇの縁部はＨとして示されるように過剰焼入れ
となって焼き割れの虞を孕み、また底部には薄い硬化層
しか形成し得ないばかりか。Therefore, even if the groove is rapidly cooled and quenched, the edge of the one-turn groove G will be over-quenched as shown by H as shown in Fig. 6(b), and there is a risk of quench cracking. Not only can only a hardened layer be formed.
硬さの低下が著しい焼入れ遷移域ｔが点描示するような
巾広い範囲に亙って生ずるので、信頼性。The quenching transition zone t, where the hardness decreases significantly, occurs over a wide range as shown in dotted lines, so reliability is low.
耐久性を確保し難い。Difficult to ensure durability.
上述の理由から、この種の中型部体内周回溝は処理時間
が長い浸炭や、歪が大きく発現するため。For the above-mentioned reasons, this kind of medium-sized inner circumferential groove requires a long carburizing process and produces large distortions.
後工程として手間のかかる矯正工程を必須とする全体炉
加熱焼入れ等によらざるを得ないのが現況であった。The current situation is that the entire body has to be heated and quenched in a furnace, which requires a time-consuming straightening process as a post-process.
（発明の目的）
本発明はこれまで実施されなかった筒体内周置溝の誘導
加熱手段による一発焼入れを実現化するためになされた
もので、溝の縁部にオーバヒートを生じさせず、充分厚
い焼入れ硬化層を確保するとともに、焼入れ遷移域を極
めて小中に抑えることが可能な筒体内周回溝焼入れ装置
を提供することを目的とする。(Objective of the Invention) The present invention was made in order to realize one-shot quenching using induction heating means for the circumferential groove in a cylinder, which has not been carried out hitherto. It is an object of the present invention to provide a cylindrical inner circumferential groove quenching device that is capable of ensuring a thick quenching hardened layer and suppressing the quenching transition region to an extremely small size.
（発明の構成）
本発明の要旨は、
（１１筒体を軸回転せしめつつ、その内壁に形成されて
いる周回溝の表面を焼入れする装置が、（２）当該筒体
内周半径より所定大とした半径の円弧を１８０°よりも
小さい所定角度範囲で描く、断面形状が溝の断面より小
に形成された円弧状加熱導体部と当該加熱導体部の両端
間を短絡する連結部とからなる誘導加熱コイル、
（３）および上記加熱導体部が描く円弧の中心軸延長線
上に所定間隔を隔てて同軸的に固定配置され。(Structure of the Invention) The gist of the present invention is as follows: (11) A device for quenching the surface of a circumferential groove formed on an inner wall of a cylindrical body while rotating the cylindrical body on its axis, (2) An induction conductor consisting of an arc-shaped heating conductor portion whose cross section is smaller than the cross section of the groove, and a connecting portion short-circuiting both ends of the heating conductor portion, which draws an arc with a radius smaller than 180° in a predetermined angle range. A heating coil (3) and the heating conductor portion are coaxially and fixedly disposed at a predetermined interval on the central axis extension of the circular arc drawn by the heating coil.
外径が筒体内径より充分小なる冷却ジャケットを備え、
（４）加熱導体部および冷却ジャケットに共通する軸線
が筒体の軸線との相対的関係において所定寸法だけ横方
向へ平行移動、かつ軸方向移動可能とするとともに、
（５）上記冷却ジャケットが加熱導体部外周を含む円周
の全方向へ冷却流体を斜め噴射可能に構成されている
ことを特徴とする筒体内周回溝焼入れ装置にある。a cooling jacket whose outer diameter is sufficiently smaller than the inner diameter of the cylinder; (5) The cooling jacket is configured to be able to inject cooling fluid obliquely in all directions of the circumference including the outer periphery of the heating conductor part, .
而して、上記装置の誘導加熱コイルにおける加熱導体部
が描く円弧の角度を１２０°に、また連結部の太さ寸法
を加熱導体部のそれよりも大に、さらに加熱導体部に磁
束を溝底方向へ集中する磁性材を付加することが好まし
い。Therefore, the angle of the arc drawn by the heating conductor in the induction heating coil of the above device is set to 120°, the thickness of the connecting portion is made larger than that of the heating conductor, and the magnetic flux is distributed through the groove in the heating conductor. It is preferable to add magnetic material concentrated toward the bottom.
（発明の作用）
本発明焼入れ装置は中型筒体内への挿入・排出が容易で
あるにも拘わらず、軸回転中の筒体内周置溝の可及的大
なる角度範囲にわたって加熱導体部を溝内に位置させる
ことが可能、かつ溝の全周方向へ冷却流体を噴射し、加
熱導体部が対向する溝表面へも間隙を介して流入せしめ
得るので、溝の全周表層を短時間で強力に所定焼入れ温
度まで均等加熱する作用、および被加熱部を一挙に急冷
する作用がある。(Function of the Invention) Although the hardening device of the present invention can be easily inserted into and discharged from a medium-sized cylinder, the heating conductor portion is grooved over the widest possible angular range of the circumferential groove in the cylinder during shaft rotation. The cooling fluid can be positioned inside the groove, and the cooling fluid can be injected in the entire circumferential direction of the groove, allowing it to flow into the groove surface facing the heating conductor through the gap. It has the effect of uniformly heating the heated part to a predetermined hardening temperature, and the effect of rapidly cooling the heated part all at once.
（実施例）
本発明を第１図（ａ）および（ｂ）に示す一実施例に従
って以下に詳述する。(Example) The present invention will be described in detail below according to an example shown in FIGS. 1(a) and 1(b).
第１図の（ａ）は正面断面図、 （ｂ）は（ａ）におけ
るＸ−Ｘ線視した平面図で、それぞれ筒体Ｗ内に本発明
実施例焼入れ装置ｌＯを挿入して周回溝Ｇ（以下単に溝
と云う）に対し位置決めした状態を示し、当該焼入れ装
置１０は誘導加熱コイル１ （以下単にコイルと云う）
および冷却ジャケット２を備えている。FIG. 1(a) is a front sectional view, and FIG. 1(b) is a plan view taken along the line X-X in FIG. 1(a). (hereinafter simply referred to as the groove), the hardening device 10 is shown positioned with respect to the induction heating coil 1 (hereinafter simply referred to as the coil).
and a cooling jacket 2.
上記コイルエは１ａおよびＩｂとして示す太さの異なる
２部分で１ターンを形成し、リードＲ９Ｒを介して図示
しない電源側給電端子に接続されている。上記１ａは加
熱導体部であり、円弧を描く如く形成され、太さ寸法は
溝Ｇの断面よりも小であり、その円弧は筒体Ｗの内周半
径ｒｗよりも所定だけ大の半径ｒｃであり、１８０”よ
りも小さい範囲で所定角度θに相当する弧長である。而
して上記半径ｒｃとした円弧を描く加熱導体部１ａは図
示の如く筒体Ｗ内で溝Ｇがある位置においてのみ、その
中心軸線Ｏを筒体Ｗの軸線ＯＷに一致させ得、かつ当該
状態で溝０表面と所定間隙を隔てて対向可能な如く諸元
が設定されている。上記１ｂは加熱導体部１ａの両端を
短絡する連結部である。当該連結部１ｂは少なくとも加
熱導体部１ａが描く円弧の残余の弧長より充分に短尺で
あり、後述する冷却ジャケット２へ冷却液を供給するパ
イプＰの邪魔にならない形状であればよく、その太さ寸
法は加熱導体部１ａのそれより大とすることが望ましい
。連結部１ｂにはリードＲ，Ｒが接続されている。尚、
実施例のコイル１は管材であり、その管内には自己冷却
用の流体が流通している。The above-mentioned coil unit forms one turn with two parts shown as 1a and Ib having different thicknesses, and is connected to a power supply side power supply terminal (not shown) via a lead R9R. The above-mentioned heating conductor part 1a is formed to draw a circular arc, the thickness dimension is smaller than the cross section of the groove G, and the circular arc has a radius rc larger than the inner circumferential radius rw of the cylindrical body W by a predetermined amount. The heating conductor portion 1a, which draws an arc with the radius rc, has an arc length corresponding to a predetermined angle θ within a range smaller than 180". As shown in the figure, the heating conductor portion 1a draws a circular arc with the radius rc at a position where the groove G is located in the cylinder W. The specifications are set so that the central axis O can be aligned with the axis OW of the cylinder W, and in this state it can face the surface of the groove 0 with a predetermined gap.The above 1b is the heating conductor part 1a. The connecting portion 1b is at least sufficiently shorter than the remaining arc length of the arc drawn by the heating conductor portion 1a, and does not get in the way of the pipe P that supplies cooling liquid to the cooling jacket 2, which will be described later. It is sufficient to have a shape that does not become larger than that of the heating conductor portion 1a, and it is desirable that the thickness dimension is larger than that of the heating conductor portion 1a.Leads R, R are connected to the connecting portion 1b.
The coil 1 of the embodiment is a tube material, and a self-cooling fluid flows within the tube.
上記冷却ジャケット２はコイル１における加熱導体部１
ａの中心軸線０の延長線上に所定間隔を隔てて同軸的に
配置される。本実施例の場合はコイル１の下方配置とさ
れ、外径が筒体Ｗの内周径よりも充分小とした台形の中
空函体である。上面周縁の斜面２１にはＳとして示す複
数の小孔が孔設されており、冷却流体供給用のパイプＰ
を介して函体内に供給される冷却流体を図示の如く加熱
導体部１ａの外周を含む円の全周方向へ向かって斜め上
方噴射可能に構成されている。The cooling jacket 2 is the heating conductor portion 1 of the coil 1.
They are arranged coaxially at a predetermined interval on an extension of the central axis 0 of a. In this embodiment, the coil 1 is disposed below the coil 1, and is a trapezoidal hollow box whose outer diameter is sufficiently smaller than the inner circumferential diameter of the cylindrical body W. A plurality of small holes shown as S are provided in the slope 21 on the periphery of the upper surface, and a pipe P for supplying cooling fluid is provided.
As shown in the figure, the cooling fluid supplied into the box can be injected obliquely upward toward the entire circumference of a circle including the outer periphery of the heating conductor portion 1a.
而して、コイル１および冷却ジャケット２は４として示
す支持部材にそれぞれリードＲ，ＲおよびパイプＰを介
して固定され、焼入れ装置１０として一体化されている
。従って、例えば焼入れ装置１０を矢印ａ−一すに従う
上下方向変位可能構成とするとともに、矢印Ｃ−ｄに従
う所定寸法だけ横方向への移動可能構成とする。従って
、焼入れ定位置である回転台上に端面を上下方向として
軸回転可能に載置された筒体Ｗの軸線ＯＷに対し、焼入
れ装置１０の軸線を筒体Ｗの軸線Ｏｗから所定寸法だけ
離れてそれに平行する０′位置。The coil 1 and the cooling jacket 2 are fixed to a support member 4 via leads R, R and a pipe P, respectively, and are integrated as a hardening device 10. Therefore, for example, the hardening device 10 is configured to be movable in the vertical direction according to the arrow a-1, and can be moved laterally by a predetermined dimension according to the arrow C-d. Therefore, with respect to the axis OW of the cylindrical body W which is rotatably placed on the rotary table, which is the fixed position for quenching, with the end face facing up and down, the axis of the quenching device 10 is separated from the axis OW of the cylindrical body W by a predetermined dimension. 0' position parallel to it.
即ち矢印ＣＩｌｌで矢印ａ−ｂに従って変位させれば、
筒体Ｗ内への挿入・排出が可能である。また、ｂ位置の
筒体Ｗ内溝に対応する深さに挿入された状態下で矢印Ｃ
側からｄ側へ所定寸法だけ横方向移動させれば、当該焼
入れ装置１０の軸線を０′位置からＯ位置に至らしめ、
筒体Ｗの軸線ＯＷに一致させることが可能であり、この
状態において加熱導体部１ａは溝Ｇ内で所定部範囲と所
定間隙を隔てて対向し、かつ冷却ジャケット２の噴射孔
Ｓから噴射される冷却流体の指向光が溝全周となるので
、筒体Ｗを軸回転せしめつつ、加熱および急冷可能であ
る。In other words, if you displace it according to arrows a-b with arrow CIll,
It can be inserted into and ejected from the cylindrical body W. In addition, when the arrow C is inserted to the depth corresponding to the inner groove of the cylinder W at position b,
By moving the hardening device 10 laterally by a predetermined dimension from the side to the d side, the axis of the quenching device 10 is brought from the 0' position to the O position,
It is possible to align the axis OW of the cylindrical body W, and in this state, the heating conductor portion 1a is opposed to a predetermined area within the groove G with a predetermined gap therebetween, and the heating conductor portion 1a is injected from the injection hole S of the cooling jacket 2. Since the directional light of the cooling fluid is directed all around the groove, it is possible to heat and rapidly cool the cylindrical body W while rotating the axis.
ところで、上記構成とした焼入れ装置ｌＯでは、加熱作
用のみを採り上げれば、加熱導体部１ａを可及的に長い
円弧を描いて溝内に位置せしめることが望ましい。然し
乍ら、被加熱部を加熱終了後直ちに短時間かつ充分に急
冷することが表面に厚い硬化層を形成可能、かつ焼入れ
遷移域を狭くする要因であるので、当該急冷作用との兼
ね合いを考慮して、実施例では円弧の角度θを１２０°
として残余角度を空けた設定である。即ち、冷却作用の
強化には限界があるのに対し、加熱作用の強化は電源出
力を大とする等の措置で可能である。By the way, in the quenching apparatus 10 having the above-mentioned structure, considering only the heating effect, it is desirable that the heating conductor portion 1a be positioned in the groove in a circular arc as long as possible. However, since it is possible to form a thick hardened layer on the surface and to narrow the quenching transition zone by sufficiently rapidly cooling the heated part immediately after heating is completed, the balance with the quenching action must be taken into consideration. , in the example, the angle θ of the circular arc is 120°
The setting is such that the residual angle is set as . That is, while there is a limit to strengthening the cooling effect, it is possible to strengthen the heating effect by increasing the power output.
そこで、本発明は加熱導体部１ａの円弧を上記の如く設
定するとともに、冷却ジャケット２を加熱導体部１ａか
ら所定離した位置とすることで冷却流体を回転中の筒体
Ｗの溝全周方向へ斜め噴射させ、加熱導体部１ａが溝に
対向する位置でも間隙から流れ込んで溝表面に達するよ
うに配慮した構成である。換言すれば、加熱作用の強化
は加熱導体１ａを溝内１２０°範囲に位置させることで
達成されており、さらに上記冷却ジャケット２の構成で
冷却作用を最大限に強化する意図である。Therefore, in the present invention, the arc of the heating conductor part 1a is set as described above, and the cooling jacket 2 is located at a predetermined distance from the heating conductor part 1a, so that the cooling fluid is directed in the entire circumferential direction of the groove of the rotating cylinder W. The structure is designed so that the heating conductor portion 1a flows through the gap and reaches the groove surface even at the position where the heating conductor portion 1a faces the groove. In other words, strengthening of the heating effect is achieved by locating the heating conductor 1a within a 120° range within the groove, and it is further intended to maximize the cooling effect with the configuration of the cooling jacket 2 described above.
また、コイル１の加熱導体部１ａと連結部１ｂとを同−
太さ寸法に設定してもよいが、連結部１ｂを加熱導体部
１ａより大きな太さ寸法とするほうが好ましい。その理
由は、加熱導体部１ａを溝Ｇ内に位置させるためには当
然＠Ｇの断面寸法に対応した太さとするのは必定である
が、連結部１ｂを太く設定することにより、通電電流密
度を加熱導体部１ａで密、加熱に直接関係しない連結部
１ｂで疎とし、これに伴い発生する磁束の密度を加熱導
体部Ｉａ側で密にして強力な加熱作用を発揮させ、その
反面連結部Ｉｂ側で疎として周囲への影響をなくすにあ
る。Also, the heating conductor portion 1a and the connecting portion 1b of the coil 1 are connected to each other at the same time.
Although the thickness may be set, it is preferable that the connecting portion 1b has a larger thickness than the heating conductor portion 1a. The reason for this is that in order to locate the heating conductor part 1a in the groove G, it is necessary to make the thickness corresponding to the cross-sectional dimension of @G, but by setting the connecting part 1b thick, the current density is dense in the heating conductor part 1a and sparse in the connecting part 1b, which is not directly related to heating, and the density of the magnetic flux generated due to this is made dense on the heating conductor part Ia side to exert a strong heating effect.On the other hand, the connecting part This is done sparsely on the Ib side to eliminate the influence on the surroundings.
さらに、加熱導体部１ａには第１図の（ａ）に３として
示す２例えば積層磁性鋼板等からなる。Further, the heating conductor portion 1a is made of, for example, a laminated magnetic steel plate 2 shown as 3 in FIG. 1(a).
磁性材を円弧の内側に付加し、発生する磁束を可及的に
溝Ｇの縁部へ向かわせず、底方向へ集中させる構成とす
ることが好ましい。It is preferable to add a magnetic material to the inside of the arc so that the generated magnetic flux is not directed toward the edges of the groove G as much as possible, but is concentrated toward the bottom.
（実験例）
本発明にかかる実施例焼入れ装置を用いた筒体内周置溝
焼入れの実験例を以下に開示する。(Experimental Example) An experimental example of circumferential groove hardening in a cylinder using the hardening apparatus according to the embodiment of the present invention will be disclosed below.
☆実験方法：供試体の溝を焼入れし、焼入れされた溝部
を後記確性試験に付し、仕上がりが予め設定した目標値
を満足するや否やを調べた。☆ Experimental method: The grooves of the specimen were hardened, and the hardened grooves were subjected to the accuracy test described later, and it was examined whether the finish satisfied the preset target value.
供試体の形状２寸法、焼入れ装置、焼入れ条件等は下記
のとおりであった。尚、設定目標値は後述確性試験結果
との対比において第３表に掲示する。The shape and dimensions of the specimen, quenching equipment, quenching conditions, etc. were as follows. The set target values are listed in Table 3 for comparison with the accuracy test results described later.
○供試体：材質 ＳＮＣＭ Ｂ相当材
形伏 筒体で内周に周回溝あり
寸法 外径；φ１３６ｍｍ
内径；φ１０９ｍｍ
肉厚： １３．５ ｍｍ
溝の深さ；５ｍｍ
ただし、涙滴半裁型断面
○焼入れ装置：第１図に示す実施例装置を使用した。た
だし加熱導体部は、
円弧の角度θ；１２０゜
断面形状；半円の管（管内は冷却水通路）磁性体；積層
珪素鋼板の付加あり
加熱時の溝との間隙；１ｍｍ
０焼入れ条件：
加熱−−−−−−一電源：周波数 １００ＫＨｚ出力１
２０Ｋｗ
加熱時間：１Ｑｓｅｃ
焼入れ・−冷却流体；高分子可溶性冷却剤の３．５％水
溶液
流量；８５ｊ！／ｍｉｎ
☆確性試験：上記諸元２条件に従って焼入れされた溝部
を下記の試験に付した。○Specimen: Material: SNCM B equivalent material Shape: Cylindrical body with a circumferential groove on the inner periphery Dimensions: Outer diameter: φ136mm Inner diameter: φ109mm Wall thickness: 13.5mm Groove depth: 5mm However, teardrop half-cut cross section ○Quenching Apparatus: The example apparatus shown in FIG. 1 was used. However, the heating conductor part has the following: Arc angle θ; 120° cross-sectional shape; semicircular tube (cooling water passage inside the tube); magnetic material; laminated silicon steel plate added; gap between groove and groove during heating; 1 mm 0 Quenching conditions: heating ---------One power supply: Frequency 100KHz output 1
20Kw Heating time: 1Qsec Quenching/cooling fluid; 3.5% aqueous solution flow rate of polymer-soluble coolant; 85j! /min ☆Accuracy test: The groove portion hardened according to the above two conditions was subjected to the following test.
Ｏ硬さ測定試験；供試体の溝部を第２図に矢線Ａおよび
Ｂに従って硬さを測定した。測定は焼入れ後および電気
炉焼戻後の試験片について実施され、測定値（ＨＶ）を
矢線Ａ部は第１表、矢線８部は第２表に示す。また、第
３図および第４図は縦軸に硬さ、横軸に溝表面からの距
離をとった図表上に第１表および第２表の測定値それぞ
れをプロットした線図であり、図上の○は焼入れ後。O hardness measurement test: The hardness of the groove portion of the specimen was measured according to the arrows A and B in FIG. Measurements were carried out on test pieces after quenching and electric furnace tempering, and the measured values (HV) are shown in Table 1 for the arrow A section and in Table 2 for the arrow 8 section. In addition, Figures 3 and 4 are diagrams in which the measured values in Tables 1 and 2 are plotted on charts with hardness on the vertical axis and distance from the groove surface on the horizontal axis. The ○ above is after quenching.
・は焼戻後の測定値である。* is the measured value after tempering.
目標値硬さＨＲｃ；５６が矢線Ａ部を示す第３図では表
面から３．５ｍｍ深さまで。Target value hardness HRc; 56 indicates the arrow A section in Fig. 3, up to a depth of 3.5 mm from the surface.
また矢線８部を示す第４図では表面から３゜１ｍｍ深さ
まで続いており、また当該深さから硬さが素材硬さ以下
まで急速に低下したうえ、素材硬さまで回復する焼入れ
遷移域の巾は矢線Ａ部が１．４５ｍｍ、矢線８部が１．
９５ｍｍであることが確認された。In addition, in Fig. 4, which shows the arrow line 8, it continues from the surface to a depth of 3°1 mm, and from this depth, the hardness rapidly decreases to below the material hardness and then recovers to the material hardness in the quenching transition region. The width is 1.45mm at the arrow A part, and 1.45mm at the arrow 8 part.
It was confirmed that it was 95 mm.
Ｏ結晶粒度測定試験：第５図にイル二として示す位置か
ら作成した試験片について結晶粒度を測定した。その結
果を各位置に括弧書きした。結晶粒度はＮｏ、 ８〜
Ｎｏ、 ９であることが確認された。O crystal grain size measurement test: The crystal grain size was measured for a test piece prepared from the position shown as Illuji in FIG. The results are written in parentheses at each position. Grain size is No. 8~
It was confirmed that it was No. 9.
☆綜合判定：以上の確性試験結果をまとめて第３表に焼
入れ仕上がり目標値と対比して示す。☆Comprehensive judgment: The above accuracy test results are summarized and shown in Table 3 in comparison with the quenching finish target value.
同表から、確性試験結果は各目標値を充分にクリアして
おり、本発明実施例焼入れ装置が溝部に深い焼入れ硬化
層を形成するとともに、焼入れ遷移域中を狭小とするの
に有効であることが証明された。From the same table, the accuracy test results sufficiently cleared each target value, and the hardening device according to the embodiment of the present invention is effective in forming a deep hardened layer in the groove and narrowing the hardened transition zone. This has been proven.
（他の実施例）
上記実施例焼入れ装置では、冷却ジャケット２として台
形プロクツ状のものを用いたが、例えば環状体であって
もよく、冷却流体を溝Ｇの全周方向へ斜め噴射可能であ
ればその形状を問うものではない。(Other Examples) In the quenching apparatus of the above embodiment, a trapezoidal block-shaped cooling jacket 2 was used, but it may also be an annular body, for example, and the cooling fluid can be injected obliquely to the entire circumferential direction of the groove G. If so, it does not matter what shape it is.
また、実施例では焼入れ装置を上下変位および横移動す
る構成とした例を挙げて説明したが、例えば回転台側を
上下変位および横移動する構成としても何等支障はなく
、実施例同様の作用・効果をマす。Further, in the embodiment, an example was explained in which the hardening device was configured to be vertically displaced and laterally moved, but for example, the rotary table side may also be configured to be vertically displaced and laterally moved without any problem, and the same effects and effects as in the embodiment are achieved. Magnify the effect.
尚、実施例は筒体Ｗの上方端面倒から焼入れ装置を下方
変位させて筒体Ｗ内に挿入するようにしているが、回転
台をリング状とするとともに、実施例とは逆にコイル１
を下方、冷却ジャケット２とを上方配置とした焼入れ装
置を用い、当該焼入れ装置が回転台のリングを貫通して
相対的上下変位および横移動可能な構成としてもよい。In the embodiment, the quenching device is displaced downward from the upper end of the cylindrical body W and inserted into the cylindrical body W, but the rotary table is formed into a ring shape, and the coil 1 is
It is also possible to use a quenching apparatus in which the cooling jacket 2 is disposed downward and the cooling jacket 2 is disposed upward, and the quenching apparatus is capable of relative vertical displacement and lateral movement through a ring of a rotary table.
当該構成とすれば、両端面が開の筒体Ｗは勿論のこと、
一方端面が閉である筒体の周回溝も回転台上に閉端面を
上として載置すれば焼入れ可能である。With this configuration, it goes without saying that the cylindrical body W with both end faces open,
On the other hand, the circumferential groove of a cylinder whose end surface is closed can also be hardened by placing it on a rotary table with the closed end surface facing upward.
（発明の効果）
本発明焼入れ装置は筒体内周回連を誘導加熱手段を用い
た一発焼入れ手法により縁部にオーバヒートを生じさせ
ることなく、かつ溝底の後背部分に巾広い焼入れ遷移域
を生じさせることな（、充分厚い焼入れ硬化層を形成可
能である。従って、本発明焼入れ装置の実施は従来の浸
炭処理と比べると飛躍的に生産性を向上させ、また全体
炉加熱による熱処理に比べると靭性に富む素地を充分に
確保しつつ、所望高品質焼入れ仕上がりが得られ、かつ
矯正工程を不要とするるので、甚大な効果をマすとして
賞用される。(Effects of the Invention) The hardening device of the present invention employs a one-shot hardening method using induction heating means for the circumferential connection in the cylinder, without causing overheating at the edges, and creating a wide hardening transition zone at the rear part of the groove bottom. Therefore, the implementation of the quenching apparatus of the present invention dramatically improves productivity compared to conventional carburizing treatment, and also improves productivity compared to heat treatment using whole furnace heating. It is prized for its great effects because it provides the desired high-quality hardened finish while ensuring a sufficiently tough base, and eliminates the need for a straightening process.
第１図（ａ）および（ｂ）は本発明一実施例焼入れ装置
の正面断面図および（ａ）におけるＸ−Ｘ線視平面図、
第２図は確性試験における溝部の硬さ測定位置を示す断
面図、第３図および第４図それぞれは硬さ測定試験結果
を示す線図、第５図は確性試験における結晶粒度測定試
験位置と結果を示す断面図、第６図（ａ）および（ｂ）
それぞれは従来−全焼入れ手法が実施されなかった理由
を説明する溝部の断面正面図である。
図において、Ｗ５筒体、Ｇ；周回溝、１０；焼入れ装置
、１；誘導加熱コイル、１ａ；加熱導体部、１ｂ；連結
部、２；冷却ジャケット、３；磁性材、ｒｗ：筒体の内
周半径、ｒｃ；加熱導体部の円弧半径、Ｏｗ；筒体の軸
線、Ｏ，Ｏ’ ：加熱導体部、冷却ジャケットに共通
する軸線、θ；加加熱体体部円弧の角度である。FIGS. 1(a) and 1(b) are a front sectional view of a quenching apparatus according to an embodiment of the present invention, and a plan view taken along line X-X in FIG. 1(a);
Figure 2 is a sectional view showing the hardness measurement position of the groove part in the accuracy test, Figures 3 and 4 are line diagrams showing the hardness measurement test results, and Figure 5 is the grain size measurement test position in the accuracy test. Cross-sectional views showing the results, Figures 6(a) and (b)
Each is a cross-sectional front view of a groove portion explaining the reason why the conventional full hardening method has not been implemented. In the figure, W5 cylinder, G: circumferential groove, 10: quenching device, 1: induction heating coil, 1a: heating conductor part, 1b: connecting part, 2: cooling jacket, 3: magnetic material, rw: inside of cylinder Circumferential radius, rc: Arc radius of the heating conductor portion, Ow: Axis line of the cylinder, O, O': Axis line common to the heating conductor portion and cooling jacket, θ: Angle of the arc of the heating body portion.
Claims (1)
る周回溝の表面を焼入れする装置が、当該筒体内周半径
より所定大とした半径の円弧を１８０°よりも小さい所
定角度範囲で描く、断面形状が溝の断面より小に形成さ
れた円弧状加熱導体部と当該加熱導体部の両端間を短絡
する連結部とからなる誘導加熱コイル、および上記加熱
導体部が描く円弧の中心軸延長線上に所定間隔を隔てて
同軸的に固定配置され、外径が筒体内径より充分小なる
冷却ジャケットを備え、加熱導体部および冷却ジャケッ
トに共通する軸線が筒体の軸線との相対的関係において
所定寸法だけ横方向へ平行移動、かつ軸方向移動可能と
するとともに、上記冷却ジャケットが加熱導体部外周を
含む円周の全方向へ冷却流体を斜め噴射可能に構成され
ていることを特徴とする筒体内周回溝焼入れ装置。 ２）加熱導体部の描く円弧の角度が１２０°である請求
項１記載の筒体内周回溝焼入れ装置。 ３）加熱コイルにおける連結部の太さ寸法を加加熱導体
部のそれより大に設定した請求項１記載の筒体内周回溝
焼入れ装置。 ４）加熱導体部に磁束を溝底方向へ向かわせる磁性材が
付加されている請求項１記載の筒体内周回溝焼入れ装置
。[Scope of Claims] 1) A device for hardening the surface of a circumferential groove formed on an inner wall of a cylinder while rotating the axis thereof, is configured to harden the surface of a circumferential groove formed in the inner wall of the cylinder, and to harden the surface of a circumferential groove formed in the inner wall of the cylinder, the An induction heating coil comprising an arc-shaped heating conductor portion whose cross-sectional shape is smaller than the cross-section of the groove and a connecting portion short-circuiting both ends of the heating conductor portion; and the heating conductor portion. A cooling jacket is fixedly arranged coaxially at a predetermined interval on the central axis extension of the circular arc drawn by the cylinder, and has a cooling jacket whose outer diameter is sufficiently smaller than the inner diameter of the cylinder. The cooling jacket is configured to be able to move laterally in parallel and axially by a predetermined dimension relative to the axis, and to inject cooling fluid obliquely in all directions of the circumference including the outer periphery of the heating conductor. A quenching device with a circumferential groove inside a cylinder. 2) The cylindrical inner circumferential groove hardening device according to claim 1, wherein the angle of the arc drawn by the heating conductor portion is 120°. 3) The cylindrical internal circumferential groove hardening device according to claim 1, wherein the thickness of the connecting portion of the heating coil is set larger than that of the heating conductor portion. 4) The cylindrical internal circumferential groove hardening device according to claim 1, wherein a magnetic material for directing magnetic flux toward the groove bottom is added to the heating conductor portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25532389A JP2670866B2 (en) | 1989-10-02 | 1989-10-02 | Circumferential groove quenching device in cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25532389A JP2670866B2 (en) | 1989-10-02 | 1989-10-02 | Circumferential groove quenching device in cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03119681A true JPH03119681A (en) | 1991-05-22 |
| JP2670866B2 JP2670866B2 (en) | 1997-10-29 |
Family
ID=17277186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25532389A Expired - Fee Related JP2670866B2 (en) | 1989-10-02 | 1989-10-02 | Circumferential groove quenching device in cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2670866B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567943A (en) * | 2014-10-29 | 2016-05-11 | 高周波热錬株式会社 | Workpiece heat treatment method |
| CN106223100A (en) * | 2016-08-24 | 2016-12-14 | 轻工业杭州机电设计研究院 | There is the paper machine dryer that tubular type is jacket structured |
-
1989
- 1989-10-02 JP JP25532389A patent/JP2670866B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567943A (en) * | 2014-10-29 | 2016-05-11 | 高周波热錬株式会社 | Workpiece heat treatment method |
| CN106223100A (en) * | 2016-08-24 | 2016-12-14 | 轻工业杭州机电设计研究院 | There is the paper machine dryer that tubular type is jacket structured |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2670866B2 (en) | 1997-10-29 |
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