JPH0613726B2 - High frequency induction induction hardening device and high frequency induction induction hardening method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-frequency induction induction hardening apparatus and a high-frequency induction induction hardening method, and particularly to a high-frequency induction hardening method for hardening the side surface of a long object to be hardened. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction induction hardening device and a high-frequency induction induction hardening method.

<Prior Art> Hereinafter, a conventional high-frequency induction induction hardening apparatus and a high-frequency induction induction hardening method for a long object to be hardened will be described with reference to the drawings. Induction hardening is a method of heating an object to be hardened by two currents: a current directly applied to the object to be hardened and a current induced in the object to be hardened by a current other than the object to be hardened. It means hardening and quenching.

FIG. 7 to FIG. 9 are drawings for explaining a conventional high-frequency induction induction quenching device for quenching the side surface of a long hardened object such as a flat plate, a round bar and a square bar. . In these drawings, the substantially same components are designated by the same reference numerals and described.

FIG. 7 (a) is a perspective view, FIG. 7 (b) is a partially cutaway side view, and FIG.
FIG. 7 (c) is a sectional view taken along the line S--S of FIG. 7 (b), and FIG. 7 (d) is a sectional view of the quenched object.

Reference numeral 3 denotes a flat plate-shaped and long object to be hardened, and a surface 3a to be hardened on a side surface 3c of the object 3 to be hardened (see FIGS. 7A and 7B).
Is set. A conventional high-frequency induction induction hardening device has a first conductor 1 and a second conductor 2. The lower end of the first conductor 1 is adjacent to one end of the surface to be hardened 3a in the longitudinal direction (direction of arrow T) and is in contact with the side surface 3c of the object to be hardened 3, and the upper end is connected to one end of the high frequency power source 5. ing. The second conductor 2 is arranged so as to face the surface 3a to be hardened, one end 2a is adjacent to the other end in the longitudinal direction of the surface 3a to be hardened, contacts the side surface 3c of the object 3 to be hardened, and the other end 2b Is fixed to the first conductor 1 via an insulator 4, and the upper end of the other end 2b is connected to the other end of the high frequency power supply 5. Between the one end 2a and the other end 2b of the second conductor 2 is hollow and a quenching cooling liquid supply pipe (not shown) is connected,
This hollow portion is filled with quenching cooling liquid. The bottom surface of the second conductor 2 is provided with a quenching coolant injection hole 2c for injecting the quenching coolant onto the surface to be quenched 3a.

When the object 3 to be hardened is energized from the high frequency power source 5 through the first conductor 1 and the second conductor 2, the hardened surface 3a of the object 3 to be hardened.
Indicates a high frequency current in the direction of arrow C (hereinafter referred to as C current).
Flows, and the C current enters the second conductor 2 through one end 2a of the second conductor 2. Of the current that has entered the second conductor 2, a high-frequency current in the direction of arrow D on the bottom surface of the second conductor 2 (hereinafter referred to as D current)
Flows. In this case, the heating of the surface 3a to be hardened is performed with
It is performed by two currents, a current induced on the surface 3a to be hardened by the D current.

8 and 9 are perspective views of the induction hardening apparatus and the object to be hardened when the object to be hardened 3 is a round bar and a square bar, respectively. The same parts as those in FIG. 7 (a) are designated by the same reference numerals.

<Problems to be Solved by the Invention> FIG. 7 shows a situation of a hardened layer when quenching is performed on a quenching surface 3a of an elongated quenching object 3 having a flat plate shape by the above apparatus.
Shown in (d). As is clear from the cross-sectional shape of the hardened layer 3b, the hardened layer 3b has a deep central portion, and the depth is not uniform. Also, as shown in FIGS. 8 and 9,
The hardened layer 3b formed on the object 3 to be hardened, which is a round bar or a square bar, is not formed to have a uniform depth. Further, when the depth of the hardened layer 3b has to be changed, it is necessary to take measures such as changing the gap distance between the lower surface of the second conductor 2 and the surface 3a to be hardened. Since the conductor 2 has to be rebuilt, it is troublesome.

The present invention was devised in view of the above circumstances, and is capable of forming a hardened layer having a substantially uniform depth on the surface to be hardened on the side surface of a long hardened object and the like. It is also possible to adjust the depth of the hardened layer to be applied relatively easily, and as its application, an induction heating induction hardening apparatus and an induction heating hardening method capable of forming a large number of separated hardening layers on the surface. It is intended to provide a method and.

<Means for Solving the Problem> In order to solve the above problems, the induction heating and quenching apparatus of the present invention is a quenching apparatus for quenching a quenching surface of a part of a quenching object. A first conductor whose one end is adjacent to one end of the surface to be hardened in the longitudinal direction and is in contact with the side surface, and the other end is arranged to face the surface to be hardened and a first conductor connected to one end of a high frequency power supply. , A plurality of shunts parallel to the longitudinal direction and parallel to each other between both ends, one end is adjacent to the other longitudinal end of the surface to be hardened and is in contact with the side surface, and the other end is the high frequency wave A second conductor connected to the other end of the power source; and a magnetic core provided between the shunts, and the length of the core in the longitudinal direction is the quenching of the surface to be quenched. The length corresponds to the depth.

Further, in order to solve the above problems, a high-frequency induction induction quenching method of the present invention is a quenching method of quenching a quenching surface of a side surface of a quenching object. The side surface of the object to be hardened is adjacent to one end in the longitudinal direction of the surface to be hardened and is in contact with the side surface, and is arranged so as to face the surface to be hardened and parallel to the longitudinal direction between both ends. One end of a second conductor having a plurality of shunts and a core provided between the shunts is adjacent to the side surface adjacent to the longitudinal direction of the surface to be hardened, and the other end of the first conductor and the The second conductor and the other end are respectively connected to both ends of a high frequency power source, a high frequency current is applied to the surface to be hardened to cool the surface to be hardened, and the length of the core in the longitudinal direction is previously set. Is set to a length corresponding to the quenching depth of the surface to be quenched.

<Operation> When the other end of the first conductor and the other end of the second conductor are connected to the high frequency power source, the high frequency current enters the first conductor and passes through the shunt of the object to be hardened and the second conductor. Return to high frequency power supply. The hardened surface of the hardened object has a substantially uniform depth due to the high-frequency current flowing on the hardened surface and the current induced on the hardened surface by the high-frequency current flowing on the bottom surface of the shunt of the second conductor. Is heated. After this heating, the quenching cooling liquid is supplied to the quenching cooling liquid space in the shunt of the second conductor, and the quenching cooling liquid is injected from the quenching cooling liquid injection hole provided on the bottom surface of the shunt. The hardened layer is formed by hitting the hardened surface and cooling the hardened surface. When the length of the core to be hardened in the longitudinal direction is changed, the depth of the formed hardened layer changes.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. The same components as those described in the related art will be described with the same reference numerals.

FIG. 1 is a drawing for explaining a first embodiment of the present invention, and FIG. 1 (a) is a perspective view of the first embodiment of the present invention,
1 (b) is a sectional view taken along the line P-P of FIG. 1 (a), FIG.
(c) is a sectional view taken along the line Q-Q of the first (b), and FIG.
1 (e) is a perspective view of a core, and FIG. 1 (f) is a perspective view of another core.

The high frequency current induction hardening apparatus of one embodiment of the present invention has a side surface 3c.
A first conductor 1 and a second conductor 2 of good conductive metal, which are arranged in contact with a hardened object 3 having a hardened surface 3a (see FIGS. 1 (a) and 1 (c)). Have

The lower end of the first conductor 1 is adjacent to one end of the surface to be hardened 3a in the longitudinal direction (direction of arrow R) and is in contact with the side surface 3c of the object to be hardened 3, and the upper end is to one end of the high-frequency power source 5. It is connected. The second conductor 2 is located above the surface 3a to be hardened (Fig. 1 (a)).
At the upper side) so as to face the surface to be hardened, one end 2a is adjacent to the other end in the longitudinal direction of the surface to be hardened 3a, and the object to be hardened 3
The other end 2b is connected to the other end of the high frequency power source 5. The other end 2b of the second conductor 2 is fixed to the first conductor 1 via an insulator 4. And the second
Two shunts 21, 22 parallel to the longitudinal direction and parallel to each other are formed between both ends of the conductor 2, and these shunts 21, 22 are formed.
A core 6 having a substantially T-shaped cross section formed by sintering iron oxide powder is inserted and fixed in the opening 23 between the two. Although the number of shunts in this embodiment is two, the number is not limited to two, and
It may be an appropriate number.

Each of the shunts 21 and 22 is formed so as to have a hollow space 24 for quenching coolant therein, and a quenching coolant supply pipe (not shown) is connected to these spaces 24 for quenching coolant. Further, a plurality of quenching coolant injection holes 2c are formed on the bottom surfaces of the shunts 21 and 22. A gap is provided between the bottom surfaces of the shunts 21 and 22 and the surface 3a to be hardened so as to maintain a predetermined distance dimension n (see FIG. 1 (b)). The core 6 of FIG. 1 (e) has a length equal to the length dimension 1 of the opening 23 of the second conductor 2, but the core 6 of FIG. 1 (f) is adjusted to adjust the depth of the hardened layer.
In some cases, a core 6'having a length m smaller than the length dimension 1 of the opening 23 is used as shown in FIG.

When the high-frequency energization induction hardening apparatus is energized from the high-frequency power source 5, the high-frequency current enters the first conductor 1 and returns to the high-frequency power source 5 via the object 3 to be hardened and the second conductor 2. in this case,
A high frequency current in the direction of arrow A (hereinafter referred to as A current) flows through the surface 3a to be hardened, and a high frequency current in the direction of arrow B (hereinafter referred to as B current) flows in the bottom surfaces of the shunts 21 and 22. Heating the surface 3a to be hardened by high-frequency current is different from heating by A current.
It is performed by two currents, a current induced on the surface 3a to be hardened by the B current. Since the B current is divided into the two shunts 21, 22, the heating depth of the hardened surface 3a due to both the induced current flowing on the hardened surface 3a by the B current and the A current is substantially uniform. When the heating of the surface to be quenched 3a is completed, the quenching cooling liquid is supplied into the quenching cooling liquid space 24 by the quenching cooling liquid supply pipe (not shown), and the quenching cooling liquid is injected into the quenching cooling liquid injection hole 2c. Is sprayed onto the hardened surface 3a to cool the hardened surface 3a. And, on the surface 3a to be hardened,
As shown in FIG. 1 (b), a hardened layer 3b is formed having a substantially uniform depth in which the central portion is not deeper than both end portions.

FIG. 2 is a graph showing the results of measuring the depth and hardness of the hardened layer 3b shown in FIG. 1 (b), in which the horizontal axis represents the depth (unit: mm) of the hardened layer 3b, The axis shows hardness (unit: Hv). In this graph, curves 21, 22, and 23 respectively indicate the case where the core is not provided, the case where the core 6 ′ is provided in a part of the opening 23, and the case where the core 6 is provided in the entire length of the opening 23, It can be seen that the effective depth (depth at which Hv does not become 450 or less) of the hardened layer 3b formed differs depending on the presence or absence of the core and the length and size of the core.

FIG. 3 is a drawing for explaining the second embodiment,
It is a drawing corresponding to FIG. 1 (b) when the hardened object is a round bar, and the bottom surfaces of the shunts 21 and 22 of the second conductor 2 have a shape corresponding to the surface of the hardened object 3 of the round bar. Has become. A hardened layer 3b having a substantially uniform depth is formed on the surface of the object 3 to be hardened so that the central portion is not deeper than both end portions. FIG. 4 is a drawing for explaining the third embodiment and is a drawing corresponding to FIG. 1 (b) in the case where the object to be hardened is a square rod,
The bottom surfaces of the shunts 21 and 22 of the conductor 2 have a shape corresponding to the surface of the hardened object 3 which is a rectangular rod. A hardened layer 3b having a substantially uniform depth is formed on the surface of the object 3 to be hardened so that the central portion is not deeper than both end portions.

FIG. 5 is a drawing for explaining the fourth embodiment,
FIG. 1 when the object to be hardened is a long flat plate with a wide width
It is a drawing corresponding to (b). In this example, three hardened layers separated from each other on the surface of a wide flat plate-shaped long hardened object 3 were used.
It forms 3b. FIG. 6 is a drawing for explaining the fifth embodiment, and is a drawing corresponding to FIG. 1 (b) when the object to be hardened is a round bar. In this embodiment, three separate hardened layers 3b are formed on the surface of a round bar to be hardened 3.

<Effects of the Invention> As described above, in the high-frequency induction induction hardening apparatus and the high-frequency induction induction hardening method of the present invention, one end of the first conductor is connected to one side of the object to be hardened in the longitudinal direction of the surface to be hardened. A plurality of shunts, which are arranged adjacent to each other and in contact with the side surface, and which are arranged so as to face the surface to be hardened and are parallel to the longitudinal direction and parallel to each other between both ends, and a core provided between the shunts. One end of the second conductor is adjacently contacted to the side surface in the longitudinal direction of the surface to be hardened, and the other end of the first conductor and the other end of the second conductor are connected to both ends of a high frequency power source, respectively. is doing.

Therefore, it is possible to form a hardened layer having a substantially uniform depth in which the central portion is not deeper than both end portions on the surface to be hardened on the side surface of the elongated hardened object. Then, the depth of the hardened layer formed by changing the length of the core to be hardened in the longitudinal direction can be adjusted. Further, by providing a predetermined number of shunts in the second conductor and appropriately selecting the number and spacing of the shunts, a predetermined number of separations are formed on the side of the long hardened object to be hardened. The cured layer can be formed.

[Brief description of drawings]

FIG. 1 is a drawing for explaining a first embodiment of the present invention, and FIG. 1 (a) is a perspective view of an embodiment of the present invention.
1B is a sectional view taken along the line PP of FIG. 1A, FIG. 1C is a sectional view taken along the line QQ of FIG. 1B, and FIG. Is a perspective view of a first conductor, FIG. 1 (e) is a perspective view of a core, and FIG. 1 (f) is a perspective view of another core. FIG. 2 is a graph showing the results of measuring the depth and hardness of the hardened layer 3b shown in FIG. 1 (b). 3 to 6 are drawings for explaining the second to fifth embodiments, respectively, and are drawings corresponding to FIG. 1 (b). FIG. 7 is a drawing for explaining a conventional high-frequency induction induction hardening apparatus for a long flat hardened object, and FIG.
Is a perspective view, FIG. 7 (b) is a partially cutaway side view, FIG. 7 (c) is a sectional view taken along the line S--S of FIG. 7 (b), and FIG. It is sectional drawing of an object. FIG. 8 and FIG. 9 are perspective views of the conventional induction hardening apparatus and the object to be hardened when the object to be hardened is a round bar and a square bar, respectively. 1 ... First conductor, 2 ... Second conductor, 3 ... Hardened object,
3a: Hardened surface, 3c: Side surface, 5: High frequency power source, 6
…… Core, 21,22 …… shunt.

Claims (2)

[Claims] 1. A quenching apparatus for quenching a quenching surface on a part of a side of a quenching object, wherein one end is adjacent to one end in the longitudinal direction of the quenching surface and contacts the side surface, A first conductor having the other end connected to one end of a high-frequency power source, and a plurality of shunts arranged opposite to the surface to be hardened, the shunts being parallel to the longitudinal direction and mutually parallel to each other, Of the magnetic body provided between the shunt and a second conductor that is adjacent to the other end of the surface to be hardened in the longitudinal direction and is in contact with the side surface, and the other end is connected to the other end of the high frequency power supply. And a core, and the length of the core in the longitudinal direction is a length corresponding to the quenching depth of the surface to be quenched. 2. A quenching method for quenching a hardened surface on a part of a side of a hardened object, wherein one end of the first conductor is one end of a side of the hardened object in a longitudinal direction of the hardened surface. A plurality of shunts, which are arranged adjacent to each other and in contact with the side surface, and which are arranged so as to face the surface to be hardened and are parallel to the longitudinal direction and parallel to each other between both ends, and a core provided between the shunts. One end of the second conductor is adjacent to the quenching surface in the longitudinal direction and is in contact with the side surface, and the other end of the first conductor and the second conductor and the other end are connected to both ends of a high frequency power source, respectively. Cooling the hardened surface after passing a high-frequency current on the hardened surface, and
A high-frequency current induction hardening method, characterized in that the length of the core in the longitudinal direction is set in advance to a length corresponding to the hardening depth of the surface to be hardened.