JP3582783B2 - High frequency moving hardening method for inner peripheral surface of cylindrical housing member of tripod constant velocity joint and high frequency coil used in the method - Google Patents

Description

【００３８】
前記具体例では、被焼入体として、ハウジング部材１を例示したが、本発明に係わる高周波コイルは、他の任意な、不等肉厚断面を有する筒形体の内面焼入に適用しうるものである。
また、前記具体例の被焼入体のように有底筒状体に限らず、無底の筒状体にも適用される。
【００３９】
なお、本発明の技術は前記実施例における技術に限定されるものではなく、同様な機能を果たす他の態様の手段によってもよく、また本発明の技術は前記構成の範囲内において種々の変更、付加が可能である。
【００４０】
【発明の効果】
以上の説明から明らかなように本発明のトリポート型等速ジョイントの筒状ハウジング部材の内周面の高周波移動焼入方法によれば、前記筒状ハウジング部材の最小径内周面から、ある間隔を隔てて、円環状の高周波コイルを前記筒状ハウジング部材の内周面内に配設し、前記筒状ハウジング部材を前記筒状ハウジング部材の軸心方向を中心として回転させるとともに、前記高周波コイルと前記筒状ハウジング部材とを前記軸心方向に沿って相対的に移動させながら、前記高周波コイルに高周波電流を供給して、前記筒状ハウジング部材の内周面を高周波加熱し、その直後、該加熱面に対して、前記高周波コイルの下部に配設されたる第１の冷却手段により冷却液を噴射して、前記内周面を移動焼入するとともに、前記筒状ハウジング部材の外周に、該外周面から、ある距離を離間して配置される第２の冷却手段により、冷却液を、前記高周波加熱に先行、または該高周波加熱に並行して噴射して、前記筒状ハウジング部材の最薄肉部の過熱を抑えるようにしているので、安価な焼入装置および移動焼入機構を用いて、高品質の焼入加工が可能になる効果を奏する。すなわち、本発明によれば、複雑かつ高価な機構が不要となる上に形状の単純な円環状の高周波コイルを用いれば済むため、焼入設備が従来と比較して極めて安価なものとなり、しかも焼入対象物を回転させることにより従来の焼入方法と比較して高品質な焼入（各溝部の焼入硬化層が均一になる）が可能となる。
【００４１】
また、前記高周波電流の周波数を５ｋＨｚ〜１５０ｋＨｚとし、また、前記円環状の高周波コイルを単巻き、または複数巻きに形成されるので、前記焼入装置９は、３つの溝位置精度に関係なく焼入が可能となり、また、前記ハウジング部材１の溝位置および軸心を正確に、かつ自動的に位置決めする機械装置も必要としない。従って、本移動焼入装置は、従来のものと比較して、極めて安価なものとなり、かつ、従来以上の高品質の焼入加工が可能となる。
【図面の簡単な説明】
【図１】本発明のトリポート型等速ジョイントの筒状ハウジング部材の内周面の高周波移動焼入方法の一実施例を示し、図２に示す高周波コイルを内蔵する高周波焼入装置により、不等肉厚部を有する筒状体としてのトリポートハウジング部材の内周面を焼入する、全体の要部配置を示す縦断面図である。
【図２】本発明の高周波移動焼入方法に使用される高周波加熱コイルの一実施例を示す斜視図である。
【図３】前記ハウジング部材１の内面を焼入するときの要部縦断面図である。
【図４】図１のＡ−Ａ線による、第２の冷却部を含む横断面図である。
【図５】従来の高周波移動焼入装置に装着されたトリポートハウジング部材の軸心に直角な面での横断面図である。
【図６】従来の高周波移動焼入装置で、図７に示す高周波コイル９を内蔵する該焼入装置により、ハウジング部材の内面を焼入する、全体の要部配置を示す斜視図である。
【図７】従来の高周波移動焼入装置に使用される高周波コイルを示す斜視図である。
【図８】従来の高周波移動焼入装置により、ハウジング部材の内面を焼入するときの要部縦断面図である。
【図９】図８のＢ−Ｂ線による、第２の冷却部を含む横断面図である。
【符号の説明】
１ ハウジング部材
２ ローラ溝
２ｂ，３ａ，４ｃ 内周面
３ 接続部
３ｂ、４ｂ 外周面
４ 区画部
９ 絶縁体
２５ 高周波焼入装置
２６ 高周波コイル
２６ａ 単巻コイル
３１ 内部ユニット
３２ 加熱部
３３ 第１の冷却部
３３ａ，３４ａ 液室部
３３ｂ，３４ｂ ノズル穴
３４ 第２の冷却部
３７ 柱状体
３８ 強磁性体
４１ 高周波電源[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-frequency moving hardening method for a cylindrical body having an unequal thickness portion, that is , an inner peripheral surface of a cylindrical housing member of a tripod constant velocity joint as an automobile part, and a high-frequency coil used in the method. .
[0002]
[Prior art]
Conventionally, as a tubular body having an unequal thickness portion to which this type of high-frequency moving quenching method is applied, for example, a housing member 1 of a tripod-type universal joint, which has been recently adopted, as shown in FIG. The thickness of the cross-section in a plane perpendicular to the axis is significantly different from part to part, and is more complicated, and irregularities are provided on the inner peripheral surface.
That is, in the tripod housing member 1, the connecting portion 3 connecting the roller rolling surfaces 2a on both sides of the roller groove 2 on which the spherical roller (not shown) rolls is sandwiched, the thickness of the connecting portion 3 is the thinnest. The partition 4 connecting the roller groove 2 and the adjacent roller groove 2 has the largest thickness.
[0003]
A conventional quenching method for moving and quenching the inner surface of the housing member 1 having such unequal thickness portions by a high-frequency heating method will be described below with reference to FIGS.
First, FIG. 6 is a perspective view showing the arrangement of the main parts of the whole when the inner surface of the housing member 1 is quenched by the induction hardening device 5 incorporating the high-frequency coil 6 shown in FIG. 7, and FIG. FIG. 8 is a perspective view of the high-frequency coil 6, FIG. 8 is a longitudinal sectional view of a main part when the inner surface of the housing member 1 is quenched, and FIG. FIG.
[0004]
As shown in FIGS. 5 and 7, the high-frequency coil 6 is formed of a hollow square tube made of a conductor such as copper, and a coolant is circulated inside the hollow tube.
The high-frequency coil 6 is inserted into three roller grooves 2 of the housing member 1 shown in FIG. 5 at the time of induction hardening, and includes single-turn coils 6a, 6b, and 6c so as to be arranged substantially horizontally. Each of the single-turn coils 6a, 6b, 6c is formed in an arc shape along the rolling surface 2a at a portion of each roller groove 2 corresponding to the roller rolling surface 2a, and a gap with the rolling surface 2a is formed. Almost constant.
[0005]
Further, at a portion of the housing member 1 corresponding to the connection portion 3 which is the thinnest portion, the single-turn coils 6a, 6b, 6c are formed substantially linearly, and are formed with the inner surface 3a of the connection portion 3 by a predetermined distance. Can be arranged and moved with a gap of. This is to prevent the connection portion 3 from being overheated. At the same time, as shown in FIG. 7, the heating conductor portion arranged corresponding to the partition portion 4 which is the thickest portion of the housing member 1 is parallel to the axis of the housing member 1, Vertical coil portions 6d, 6e, 6d, 6e, 7, 8 forming the rising portions of the coils 6a, 6b, 6c are formed and connected.
[0006]
That is, both ends of each of the single-turn coils 6a, 6b, 6c are bent from the horizontal direction to the vertical direction at the corresponding positions of the partitioning section 4 to form the vertical coil sections 6d, 6e, 6d, 6e, 7, 8, respectively. The vertical coil portions 6d, 6e, 6d, 6e, 7, 8 are extended to a predetermined length with an electric insulator 9 interposed therebetween, As shown in FIG. 7, the tops are interconnected. In this case, only the portion between the vertical coil portions 7 and 8 between the single-turn coils 6c and 6a is extended while being insulated by an insulator 9, and is connected to a high-frequency power supply as a lead tube as described later. .
[0007]
Therefore, in the high-frequency coil 6, as a whole, the single-turn coils 6a, 6b, 6c are connected in series via the vertical coil portions 6d, 6e, 6d, 6e, 7, 8 respectively. A high-frequency current flows through the entire high-frequency coil 6 and cooling water circulates through the hollow portion.
In this case, in the vertical coil portions 6d, 6e, 6d, 6e, 7, 8 arranged opposite to the partition portion 4, respective vertical coil portions 6d, 6e; 6d, 6e; The directions of the high-frequency currents flowing between the sections 8 are opposite to each other, and the section 4 is not induction-heated.
The gap between the vertical coil portions 6d, 6e; 6d, 6e; 7, 8 as the coil rising portions, between which the insulator 9 is interposed, is as narrow as possible without any problem.
[0008]
The induction hardening device 8 includes an internal unit 11 including a heating unit 12 having the high-frequency coil 6 built therein and a first cooling unit 13, and a second cooling unit 14.
As shown in FIGS. 6 and 8, the internal unit 11 is inserted into a through-hole 16 formed in the base 15 and protrudes upward. Are equally distributed in three directions according to the shape of.
As shown in FIG. 8, the heating unit 12 and the first cooling unit 13 constituting the internal unit 11 perform the heating along the vertical direction of the induction hardening device 5 (the axial direction 1 a of the housing member 1). The unit 12 is integrally formed so that the unit 12 is located above the elevating direction and the first cooling unit 13 is located below.
[0009]
The heating part 12 is formed by the high-frequency coil 6 and the single-turn coils 6 a, 6 b, 6 c of the high-frequency coil 6 while covering the front and rear sides (upper and lower sides in FIG. 8) in the axial direction 1 a of the housing member. 1 is formed of a ferromagnetic material 18 such as a dust core or a silicon steel plate exposing only the side surface facing the inner peripheral surface to enhance the effect of induction heating by high-frequency current.
The vertical coil portions 7, 8 of the high-frequency coil 6 are connected to a high-frequency power source (not shown) via lead wires (not shown), and one of the pair of vertical coil portions 7, 8 is supplied. The water supply pipe is connected to the water source, and the other is connected to the drain pipe.
[0010]
The columnar body 17 itself shown in FIG. 6 is also formed of an insulating material, and the first cooling unit 13 is integrally assembled to the lower part of the heating unit 12 as shown in FIG. A plurality of nozzle holes 13b for cooling liquid are formed radially in the liquid chamber portion 13a having a hollow portion formed therein in the outer peripheral direction, and the cooling liquid is formed on the entire inner peripheral surface 2b of the heated roller groove 2. Is to be injected.
The direction of the nozzle hole 13b is formed by drilling slightly downward in FIG.
Similarly to the heating unit 12, the three first cooling units 13 equally divided and distributed in three directions are respectively cooled by pipes (not shown) in the columnar body 17 as appropriate. It is connected to a hydraulic pressure feed pipe 19. The lower portion of the pressure feed pipe 19 is connected to a coolant tank (not shown), and the coolant is fed into each of the cooling units 13 by a suitable pressure feeding means.
[0011]
The second cooling portion 14 forms a plurality (three in the figure) of arc-shaped liquid chamber portions 14 a, and has an outer peripheral surface 3 b of the connecting portion 3 of the housing member 1 and an outer peripheral surface of the partition portion 4. A plurality of nozzle holes 14b are formed in a surface of the liquid chamber portion 14a, which faces the outer peripheral surfaces 3b and 4b, of the liquid chamber portion 14a that is opposed to and disposed with a certain gap therebetween and forms a hollow portion. Coolant is supplied by a pressure feed pipe 20 connecting the cooling unit 14 and a coolant tank (not shown). Note that the internal unit 11 and the second cooling unit 14 in FIG. 6 are all arranged at substantially the same height so as to protrude from the base 15.
[0012]
Next, the operation of the induction hardening device 5 will be described.
When the inner surface of the housing member 1 is hardened by the induction hardening device 5 having the built-in high frequency coil 6, the induction hardening device 5 is first fixed at a predetermined position as shown in FIG. The housing member 1 disposed immediately above the housing member is continuously lowered at a predetermined speed downward by a lifting means (not shown).
The high-frequency coil 6 in the internal unit 11 of the high-frequency hardening device 5 passes through the opening 1b at the lower end of the housing member 1 and is inserted into the housing member 1, and as shown in FIG. Each of the single-turn coils 6a, 6b, 6c is arranged in the roller assembly 2, and the vertical coil portions 6d, 6e, 6d, 6e, 7, 8 are divided along the axial direction of the housing member 1. A high-frequency current is supplied to the high-frequency coil 6 by disposing the high-frequency coil 6 in parallel with the inner surface of the section 4.
[0013]
As the high-frequency coil 6 moves upward at a certain speed relative to the housing member 1, the inner peripheral surface 2b of the roller groove 2 facing each of the single-turn coils 6a, 6b, 6c An induced current is generated on the surface, and the surface is instantaneously (relatively short) heated by Joule heat.
Next, when the heated inner peripheral surface 2b reaches a predetermined temperature, a cooling liquid is jetted from the first cooling unit 13 disposed below the high-frequency coil 6 toward the heating surface, The heated surface is rapidly cooled to form a quenched layer (T) on the entire inner peripheral surface 2b of the roller groove 2, which is the heated surface.
[0014]
[Problems to be solved by the invention]
By the way, when the inner peripheral surface of the housing member 1 in which the three roller grooves 2 to be quenched are formed by using the induction hardening device 5, the high-frequency coil of the hardening device 5 is hardened. A necessary condition is that there is no variation in the gaps (air gaps) between the single-turn coils 6a, 6b, 6c and the inner peripheral surface of the groove. That is, if there is variation in the gap, variation occurs in the quenching temperature, and thus variation occurs in the quenched layer. The variation in the quenched layer causes quenching distortion and also causes quench cracking.
[0015]
In order to secure the relative positional accuracy between the high-frequency coil 6 and the inner peripheral surface of the groove of the housing member 1 and to form a uniform hardened layer, the mechanical accuracy of the hardening device 8 and the housing member 1 Positioning accuracy must be improved. That is, the quenching device 5 must reduce the variation in the positional accuracy of the three roller grooves 2 with respect to the axis of the housing member 1. At the same time, a mechanical device for accurately and automatically positioning the position and the axis of the roller groove 2 of the housing member 1 is required.
[0016]
However, there is a problem that the hardening device 5 having the mechanical accuracy and the work positioning device as the housing member 1 having the positioning accuracy are very expensive. In particular, the price of the moving quenching machine for the housing member 1, which is composed of the highly accurate workpiece positioning device, is about 80% of that of the full induction quenching device.
[0017]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems and to use a low-cost quenching device and a moving quenching mechanism to perform high-quality quenching, a tripod type constant velocity. An object of the present invention is to propose a high-frequency moving quenching method for an inner peripheral surface of a cylindrical housing member of a joint.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the structure of the high-frequency moving and quenching method of the inner peripheral surface of the cylindrical housing member of the tripod constant velocity joint according to the present invention includes a high-frequency coil for heating and a cylindrical housing member of the tripod constant velocity joint. While relatively moving the inner peripheral surface of the cylindrical housing member, immediately after that, when cooling water is sprayed on the heated inner peripheral surface to harden the inner peripheral surface, An annular high-frequency coil is disposed in the inner peripheral surface of the cylindrical housing member at a certain distance from the minimum diameter inner peripheral surface of the cylindrical housing member, and the cylindrical housing member is formed in the cylindrical shape. A high-frequency current is supplied to the high-frequency coil while rotating about the axial direction of the housing member and moving the high-frequency coil and the cylindrical housing member relatively along the axial direction. The high frequency heating of the inner peripheral surface of the cylindrical housing member, immediately thereafter, by spraying a cooling liquid to the heating surface by a first cooling means disposed below the high frequency coil, While moving and quenching the inner peripheral surface , the outer peripheral surface of the cylindrical housing member, from the outer peripheral surface, by a second cooling means disposed at a distance from the cooling liquid, prior to the high-frequency heating, Alternatively, it is a method of injecting in parallel with the high-frequency heating to suppress overheating of the thinnest portion of the cylindrical housing member .
[0021]
In the above method, the frequency of the high-frequency current is in a range of 5 kHz to 150 kHz.
[0023]
Hereinafter, a preferred embodiment of the present invention will be illustratively described in detail with reference to the drawings.
FIGS. 1 to 4 are views showing an embodiment of a high-frequency moving quenching method for a cylindrical inner surface having an unequal thickness portion and a high-frequency heating coil used in the high-frequency moving quenching method of the present invention. FIG. 1 shows an inner surface of the tripod housing member (cylindrical housing member) 1 as a cylindrical body having an unequal thickness portion by an induction hardening device 25 incorporating a high-frequency coil 26 shown in FIG. FIG. 2 is a vertical cross-sectional view showing the arrangement of main parts when quenching, FIG. 2 is a perspective view of the high-frequency coil 26, FIG. 3 is a vertical cross-sectional view showing main parts when quenching the inner surface of the housing member 1. FIG. 4 is a cross-sectional view including the second cooling unit 34 along the line AA in FIG. 1. The same members as those in FIGS. 5 to 9 are denoted by the same reference numerals, and description thereof will be omitted.
[0024]
The high-frequency coil 26 shown in FIG. 2 is formed of a hollow square tube made of a conductor such as copper, and a coolant is circulated inside the hollow tube.
The high-frequency coil 26 is inserted into the housing member 1 at the time of induction hardening, and is formed in an annular single-turn coil portion 26 a arranged substantially in a horizontal plane at right angles to the axis of the housing member 1 and the single-turn coil. Both ends of the coil portion 26a are bent toward the center of the coil, and are vertically bent from near the center of the coil, and are connected to the vertical coil portions 26b and 26c disposed along the axis as rising portions, respectively. To form one series coil. The vertical coil portions 26b and 26c are extended while being insulated by the insulator 9, and their ends are connected to a high-frequency power supply 41 as a lead tube. The directions of the high-frequency currents flowing between the vertical coil portions 26b and 26c are opposite to each other, and no induction heating is performed.
[0025]
In the present embodiment, the high-frequency coil 26 is wound around a single-turn toroidal coil 26a with a certain gap between the minimum-diameter inner peripheral surface 4c of the housing member 1 and the minimum-diameter inner peripheral surface 4c. 4c, it is inserted and disposed movably in the axial direction 1a of the housing member 1 relative to the housing member 1.
[0026]
The induction hardening device 25 in the present embodiment is configured as follows.
The induction hardening device 25 includes an internal unit 31 including a heating unit 32 containing the high-frequency coil 26 and a first cooling unit 33, and a second cooling unit 34.
As shown in FIG. 1 and FIG. 3, the internal unit 21 is inserted into a through hole 36 formed in a base 35 of the induction hardening device 25 and protrudes upward, and a tip of a columnar body 37 is disposed. 37a is arranged in accordance with the shape of the high-frequency coil 26.
As shown in FIG. 3, the heating unit 32 and the first cooling unit 33 that constitute the internal unit 31 are arranged along a vertical direction of the induction hardening device 25 (axial direction 1 a of the housing member 1). The heating section 32 is integrally formed so as to be located above the elevating direction, and the first cooling section 33 is located below.
[0027]
The heating unit 32 faces the inner peripheral surface of the housing member 1 while covering the front and rear side surfaces (upper and lower side surfaces in FIG. 3) of the high-frequency coil 26 and the single-turn coil 26 a of the high-frequency coil 26. It is formed from a dust core or a magnetic body 38 such as a silicon steel plate which exposes only the coil side surface and enhances the induction heating effect by high frequency current.
The high-frequency coil 26 is connected at an end thereof to a high-frequency power supply 41 for heating via a lead wire 40, and one end of the coil 26 is connected to a water supply source, and the other end is connected to a drain pipe. You.
[0028]
As shown in FIG. 3, the first cooling unit 33 is integrally assembled to a lower portion of the heating unit 32, and a liquid chamber 33a having a hollow portion formed therein has a cooling liquid radially formed on an outer peripheral surface thereof. Are provided so that the coolant can be sprayed on the entire inner peripheral surface 2b of the roller groove 2 of the housing member 1.
The direction of the nozzle hole 33b is formed by drilling downward at a certain angle in FIG.
The first cooling unit 33 is connected to a cooling fluid pressure feeding pipe 19, and a lower portion of the pressure feeding pipe 19 is connected to a cooling fluid tank (not shown). Pump.
[0029]
The second cooling portion 34 forms an annular liquid chamber facing the entire outer peripheral surface of the housing member 1 at a predetermined interval at the time of quenching from the outer peripheral surface 3b of the housing member 1. A plurality of nozzle holes 34b are formed in the liquid chamber portion 34a formed and arranged as described above and forming a hollow portion on a surface facing the entire outer peripheral surface of the housing member 1. The cooling liquid is supplied via a pressure feed pipe 20 connecting the second cooling section 34 and a cooling liquid tank (not shown).
[0030]
Next, the operation of the induction hardening device 25 in the present embodiment will be described.
When the entire inner surface of the housing member 1 is hardened by the induction hardening device 25 having the high-frequency coil 26 therein, first, as shown in FIG. 1, the induction hardening device 25 is fixed at a predetermined position. The housing member 1 disposed immediately above the housing member 1 is rotated downward by a rotation drive device (not shown) at a certain required number of rotations on the axis thereof, and the housing member 1 is appropriately moved downward by a lifting mechanism. lowering continuously at a predetermined speed. In this case, during rotation of the housing member 1, the center of rotation is prevented from being eccentric.
[0031]
The high frequency coil 26 in the internal unit 31 of the high frequency quenching device 25 passes through the opening 1b at the lower end of the housing member 1 and is inserted into the housing member 1, and as shown in FIG. And the vertical coil portions 26b and 26c are arranged along the axial direction of the housing member 1 to supply a high-frequency current to the coil 26.
[0032]
The high-frequency coil 26 is moved upward with respect to the housing member 1 at a certain speed in the axial direction while rotating the housing member 1 at a certain predetermined number of revolutions around the axis. When moved, the inner peripheral surface 2b of the housing member 1 facing the single-turn coil 26a generates an induced current on its surface and is heated instantaneously or in a relatively short time by Joule heat.
Next, when the heated inner peripheral surface 2b reaches a predetermined temperature, a cooling liquid is jetted from the first cooling unit 33 disposed below the high-frequency coil 26 toward the heating surface, The heated surface is rapidly cooled to form a quenched layer (T) on the inner peripheral surface.
[0033]
At this time, as shown in FIG. 3, the annular high-frequency coil 26 is separated from the inner peripheral surface 4c (minimum diameter inner peripheral surface) of the partition 4 of the housing member 1 by a predetermined gap (gap). Are disposed. As described above, the outer peripheral surface of the single-turn coil 26a and the inner peripheral surface 46 of the partition portion 4 are close to each other, and the inner peripheral surface 3b of the connection portion 3 of the roller groove 2 is Although the gap with the outer peripheral surface of the single-turn coil 26a is large, the heat capacity of the partitioning section 4 is the largest and the heat capacity gradually decreases from the roller rolling surface 2a to the connection section 3, so that the high-frequency power supply By appropriately selecting the frequency of 41 within the range of 5 kHz to 150 kHz, it is possible to obtain a substantially uniform hardened layer over the entire inner peripheral surface of the housing member 1.
[0034]
Further, in the portion of the connection portion 3 which is the thinnest portion, the high-frequency coil 26 has the longest distance from the inner peripheral surface 3a thereof, and the outer peripheral surface 3b of the connection portion 3 has the second cooling cooling water from section 34, the aforementioned prior row in the heating or because it is injected in parallel with the heating, the inner circumferential surface 3a is as the roller rolling surface 2a of the inner circumferential surface 2b of the roller grooves 2, Is not heated, and therefore, the depth (t) of the quenched layer formed by the first cooling unit 33 also becomes relatively thin.
[0035]
Thus, the inner peripheral surface of the housing member 1 to be quenched is heated and cooled while being rotated, so that an induction hardened layer can be formed uniformly and evenly. There is no need for a mechanical device for ensuring the positional accuracy with respect to the workpiece (housing member 1), and the quenching device itself does not require the same accuracy as a conventional quenching device. At the same time, higher quality than before can be secured.
[0036]
As shown in FIG. 3, when the housing member 1 descends while rotating and a quenched layer (T) is formed near the bottom surface 1c of the member 1, the supply of the high-frequency current of the high-frequency coil 26 is cut off. Thereafter, the housing member 1 may be raised while stopping the rotation.
When the quenching of the first housing member 1 is completed, the next housing member 1 moves and is disposed immediately above the quenching device 25 and starts rotating and descending. 1 enables continuous hardening work.
[0037]
Hereinafter, a specific example in this embodiment will be described.

[0038]
In the specific example, the housing member 1 is illustrated as the quenched body. However, the high-frequency coil according to the present invention can be applied to the internal hardening of any other cylindrical body having an unequal thickness cross section. It is.
Further, the present invention is not limited to the cylindrical body having the bottom as in the hardened body of the specific example, and is also applicable to a cylindrical body having no bottom.
[0039]
Note that the technology of the present invention is not limited to the technology in the above-described embodiment, and may be implemented by means of another embodiment that performs a similar function. Addition is possible.
[0040]
【The invention's effect】
As is clear from the above description, according to the high-frequency moving quenching method of the inner peripheral surface of the cylindrical housing member of the tripod constant velocity joint of the present invention, the distance from the minimum diameter inner peripheral surface of the cylindrical housing member is a certain distance. An annular high-frequency coil is disposed in the inner peripheral surface of the cylindrical housing member, and the cylindrical housing member is rotated about an axial direction of the cylindrical housing member. And while relatively moving the cylindrical housing member along the axial direction, supplying a high-frequency current to the high-frequency coil, high-frequency heating the inner peripheral surface of the cylindrical housing member, immediately thereafter, against the heating surface, said injected cooling fluid by the first cooling means upcoming is arranged in a lower portion of the high-frequency coil, thereby moving quenching the inner peripheral surface of the cylindrical housing member Around the periphery, the cooling liquid is injected by a second cooling means arranged at a certain distance from the outer peripheral surface, prior to the high-frequency heating or in parallel with the high-frequency heating, and Since the overheating of the thinnest portion of the member is suppressed , high quality quenching can be performed using an inexpensive quenching device and a moving quenching mechanism. That is, according to the present invention, requires, in comparison quenching equipment as conventional becomes extremely inexpensive With the simple annular radio frequency coil shape on complex and expensive mechanism is not necessary, moreover By rotating the object to be quenched, high-quality quenching (a quench hardened layer in each groove becomes uniform) becomes possible as compared with the conventional quenching method.
[0041]
Further, since the frequency of the high-frequency current is 5 kHz to 150 kHz, and the annular high-frequency coil is formed in a single winding or a plurality of windings, the quenching device 9 can harden regardless of the three groove position accuracy. And a mechanical device for accurately and automatically positioning the groove position and the axis of the housing member 1 is not required. Therefore, the present mobile quenching apparatus is extremely inexpensive as compared with the conventional one, and the quenching process of higher quality than before can be performed.
[Brief description of the drawings]
[1] shows one embodiment of a high frequency moving quenching method of the inner peripheral surface of the tripod type constant velocity universal joint of the cylindrical housing member of the present invention, the induction hardening NyuSo location having a built-in high-frequency coil shown in FIG. 2 more, quench the inner peripheral surface of the tripod housing member as a tubular body having an unequal thickness portions is a longitudinal sectional view showing the whole of a main part arrangement.
FIG. 2 is a perspective view showing one embodiment of a high-frequency heating coil used in the high-frequency moving quenching method of the present invention.
FIG. 3 is a longitudinal sectional view of a main part when the inner surface of the housing member 1 is quenched.
FIG. 4 is a cross-sectional view including a second cooling unit, taken along line AA of FIG. 1;
FIG. 5 is a cross-sectional view of a tripod housing member mounted on a conventional high-frequency moving quenching apparatus, taken along a plane perpendicular to the axis.
FIG. 6 is a perspective view showing a general arrangement of main parts of a conventional high-frequency moving hardening device, in which the inner surface of a housing member is hardened by the hardening device incorporating the high-frequency coil 9 shown in FIG.
FIG. 7 is a perspective view showing a high-frequency coil used in a conventional high-frequency moving hardening apparatus.
FIG. 8 is a longitudinal sectional view of an essential part when the inner surface of a housing member is quenched by a conventional high-frequency moving quenching apparatus.
FIG. 9 is a cross-sectional view including a second cooling unit, taken along line BB of FIG. 8;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing member 2 Roller groove 2b, 3a, 4c Inner peripheral surface 3 Connection part 3b, 4b Outer peripheral surface 4 Partition part 9 Insulator 25 Induction hardening device 26 High frequency coil 26a Single winding coil 31 Internal unit 32 Heating unit 33 First Cooling sections 33a, 34a Liquid chamber sections 33b, 34b Nozzle holes 34 Second cooling section 37 Columnar body 38 Ferromagnetic body 41 High frequency power supply

Claims (2)

While relatively moving the high-frequency coil for heating and the cylindrical housing member of the tripod constant velocity joint, heat the inner peripheral surface of the cylindrical housing member, immediately after, on the heated inner peripheral surface, Injecting a cooling liquid, when quenching the inner peripheral surface,
An annular high-frequency coil is disposed in the inner peripheral surface of the cylindrical housing member at a certain interval from the minimum diameter inner peripheral surface of the cylindrical housing member, and the cylindrical housing member is disposed in the cylindrical housing. While rotating about the axial direction of the member and supplying the high-frequency current to the high-frequency coil while relatively moving the high-frequency coil and the cylindrical housing member along the axial direction, the cylinder The inner peripheral surface of the cylindrical housing member is subjected to high-frequency heating, and immediately thereafter, a cooling liquid is sprayed on the heated surface by a first cooling means disposed below the high-frequency coil, thereby cleaning the inner peripheral surface. while moving quenching, the outer periphery of the tubular housing member, from the outer peripheral surface, the second cooling means are spaced a certain distance, the coolant, prior to the high-frequency heating, or the radiofrequency Is injected in parallel with, the cylindrical housing high-frequency moving quenching method of the inner peripheral surface of the cylindrical housing member tripod constant-velocity joint, characterized in that to suppress the overheating of the thinnest portion of the member. The method of claim 1, wherein a frequency of the high-frequency current is in a range of 5 kHz to 150 kHz.

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