JPH0776379B2 - Internal gear hardening method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quenching method and apparatus for internal gears.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings. Conventionally, in order to harden the tooth bottom portion 3 and the tooth side portion 4 while leaving the tooth tip portion 2 of each tooth 1 of the internal gear (hereinafter also simply referred to as a gear) W shown in FIG. 3, the tooth bottom portion 3 of the gear W is The coil body 10 shown in FIG. 5, which heats the tooth side portion 4 by high frequency induction heating, is arranged in the inter-tooth space 5 and then bent in a U shape while moving in the axial direction of the gear W (direction perpendicular to the circumferential direction). A high-frequency current is applied to the heating coil 11, and quenching cooling liquid is injected from the injection hole 21 of the jacket 20 that moves between the teeth 5 in synchronization with the coil body 10 to form tooth side portions.
Quench 4 and root part 3.

The coil body 10 includes, in addition to the heating coil 11, a pair of power supply conductors 13 for connecting the heating coil 11 to the secondary side of the current transformer and a core 12 made of a magnetic material such as a trapezoidal ferrite. I have it. Further, the jacket 20 has a plurality of injection holes 21 for injecting the quenching cooling liquid and has a front surface 20a and side surfaces 20b.
Further, a cooling liquid supply pipe 22 for supplying the quenching cooling liquid is provided on the rear surface. The effect of providing this core 15 is Showa
It is described in Japanese Utility Model Publication No. 15488 of 1983.

Since the tooth tips 2 are not hardened during the above quenching, a magnetic substance, such as a rectangular parallelepiped-shaped ferrite product, is formed so as to approach and face the tooth tips 2 of the teeth 1 on both sides of the coil body 10. A pair of cores 15 are arranged as shown in FIG.
It is moved in conjunction with 10 so that the magnetic flux is not focused on the tooth tip 2 as much as possible.

Practically, the coil body 10, the core 12 and the core 15 are integrally attached to a frame body (not shown in FIG. 3), the internal gear W is fixed during quenching, and this frame body is used as the gear W. Move in the axial direction.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When quenching the tooth side portions 4 on both sides of the tooth bottom portion 3 and the tooth bottom portion 3, first, the tip portion 11a of the heating coil 11 and the pair of side surfaces 12a of the core 12 are respectively attached to the tooth bottom portion 3 of the tooth 1 and this tooth bottom portion. 3 are located close to a pair of tooth sides 4 on both sides of the tooth 3 at a predetermined distance, and the tip portion 20a and the pair of side surfaces 20b of the jacket 20 are also the tooth bottom portion 3 and the tooth side portion of the tooth 1, respectively. Four
Are placed close to each other with a predetermined distance.

As described above, the coil body 10 and the jacket 20 are manually arranged at predetermined positions in the interdental space 5, but it requires a great deal of skill to perform this arrangement accurately. Moreover, 1
In order to quench the individual gear W, this manual work has to be repeated for the number of teeth 1. Also, after quenching the tooth bottom part 3 and the tooth side part 4, in order to quench the next tooth bottom part 3 and the tooth side part 4,
W is manually rotated by one pitch of tooth 1,
This manual work is also extremely troublesome because it is necessary to perform the number of teeth 1 by the time the quenching of one gear W is completed.

The present invention was devised in view of the above circumstances. After accurately and mechanically arranging a coil body at a predetermined position between teeth of an internal gear, a tooth bottom portion and a tooth side portion of each tooth are sequentially arranged. It is an object to provide a method and a device for mechanically repeating quenching.

[0009]

In order to solve the above problems, an internal gear quenching method according to the present invention is such that an internal gear is rotatable horizontally and around a center of the gear by a pinion meshed with the gear. , A coil body for high-frequency induction heating the tooth bottom and tooth sides of the gear, a jacket integrally connected to the coil body below the coil body, and coil bodies on both sides of the coil body. A pair of magnetic bodies that are integrally connected to the coil body at the same height and that are arranged close to the tooth tips on both sides between the teeth when the coil body is inserted between the teeth of the gear. A pair of coil positioning plates, which are arranged on the inner lower side, are arranged on both sides of the coil body at substantially the same height as the gears, and horizontally move in synchronization with the coil body, Coil positioning plate, coil body, jacket and magnetism Horizontally toward the teeth, insert the tip of the coil positioning plate between the teeth to abut against the tooth sides, and position the coil body and the jacket below the teeth, and then move the coil body and the jacket. And from the lower part of the interdental space to the upper part to move high-frequency current to the coil body,
Further, quenching cooling liquid is jetted from the jacket to quench the tooth bottom portion and the tooth side portion, and then the coil body, the jacket, the magnetic body and the coil positioning plate are moved horizontally toward the center of the gear, and the tooth is then moved. Away from the distance and then lower it,
After driving the pinion to rotate the internal gear by a predetermined number of teeth, the quenching similar to the above is repeated.

In order to solve the above problems, the internal gear hardening apparatus of the present invention is an internal gear hardening apparatus for hardening an horizontally arranged internal gear having a hardening mechanism and a work rotating mechanism. In the quenching mechanism, the quenching mechanism is disposed inside the gear, and a coil body for high-frequency induction heating the tooth bottom portion and tooth side portion of the gear, and quenching is integrally formed with the coil body below the coil body. The jacket that injects the cooling liquid and the coil body are integrally connected to both sides of the coil body at approximately the same height as the coil body, and when the coil body is inserted between the teeth of the gear, the teeth on both sides between the teeth are formed. A pair of magnetic bodies disposed close to the front portion, and on both sides of the coil body at the inner side at substantially the same height as the gear and horizontally moving in synchronization with the coil body so that the coil body is located between the teeth. When inserted, it is inserted between a pair of teeth on both sides of this tooth The work includes a pair of coil positioning plates whose ends are in contact with the tooth side portions, a coil body, a jacket, a means for horizontally moving the coil positioning plate in synchronization, and a means for moving the coil body and the jacket up and down. The rotating mechanism includes a work support that supports a peripheral portion of the gear and is rotatable about a vertical axis, a pinion that meshes with the gear to rotate the gear, and a unit that rotationally drives the pinion.

In the internal gear quenching device of the present invention, a disk having protrusions formed at the same number as the number of teeth of the pinion at equal intervals and attached to a means for rotationally driving the pinion, and the protrusions It is preferable that the means for activating and rotating the pinion is provided with a switch for issuing a signal for stopping the rotational drive of the pinion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus capable of implementing the internal gear hardening method of the present invention will be described below with reference to the drawings. 1 to 6 are drawings for explaining this embodiment, FIG. 1 is a partial vertical sectional front view, and FIG. 2 is XX of FIG.
4 is an explanatory plan view taken along a line arrow, FIG. 3 is an enlarged plan explanatory view of a main part, and FIG.
Is a plan view of a disk and a proximity switch, FIG. 5 is a perspective view of a coil body, and FIG. 6 is a perspective view of a jacket.

As shown in FIG. 1, the internal gear quenching device of this embodiment includes a quenching mechanism A, a work rotating mechanism B, and a controller C.
And a common stand D to which these two mechanisms and one device are attached. Then, the quenching mechanism A has a function of quenching the gear W and a function of precisely positioning the coil body 10 with respect to the gear W, and the work rotating mechanism B has the gear W centering around the gear W in the axial direction. The controller C has a function of rotating and setting the approximate position of the gear W 1 with respect to the coil body 10, and the controller C has a function of controlling the quenching mechanism A and the workpiece rotating mechanism B to perform the above functions.

The quenching mechanism A includes a coil body 10 and a jacket 20.
Also, a current transformer 30 for supplying a high frequency current to the coil body 10 is provided. The coil body 10 and the jacket 20 themselves are the same as those described in the related art, and therefore the description thereof is omitted here.

A pair of sliders 33 are fixed to the lower portion of the current transformer 30, and the sliders 33 are provided with a rod 34 bridged between a pair of support members 35 provided on a transformer base 36.
It is externally slidably attached to. On the common stand D, the rod
A coil body raising / lowering motor base 41 having a coil 38 and a coil body raising / lowering motor 42 mounted on the upper surface thereof is provided upright, and the upper end portion and the lower end portion of the transformer base 36 are slidably fitted on the rod 38.

A trapezoidal screw is formed on the output shaft 39 extending below the coil body raising / lowering motor 42, and the mover 37 is screwed onto this trapezoidal screw. One end of the mover 37 is fixed to the transformer base 36, and the mover 37 is slidably fitted on the rod 38.

A rectangular parallelepiped current transformer output section 31 is attached to the side surface of the current transformer 30, and a substantially V-shaped coil body holding section extending downward is attached to the side surface of the current transformer output section 31. 32 is fixed. The coil body 10 and the jacket 20 are attached to the lower end of the coil body holding portion 32 so that the coil body 10 is on the upper side and the jacket 20 is directly below the coil body 10.

Further, a flexible electric wire (not shown) is connected to the current transformer 30, and a high frequency current is supplied to the current transformer 30 from a high frequency power source (not shown) through the flexible electric wire. The pair of cores 15 described in the prior art is a pair of members protruding from the lower surface of the coil body holding portion 32.
16 (see Fig. 3).

The power supply conductor 13 of the coil body 10 and the cooling liquid supply pipe 22 of the jacket 20 are extended to the inside of the coil body holding portion 32, the current transformer output portion 31 and the current transformer 30 and are appropriately supported. The power supply conductor 13 is connected in the current transformer 30 to the secondary winding of the current transformer 30. Further, the cooling liquid supply pipe 22 is connected to a cooling liquid pipe (not shown) in the current transformer 30.

A pair of horizontally arranged rods 63 are bridged between a pair of members 65 erected on the common stand D, and a slider 61 having a substantially rectangular parallelepiped shape is slidable on these rods 63. Is extrapolated to. A hydraulic cylinder 62 is attached to one member 65, and a tip end portion of a piston 64 of this hydraulic cylinder is connected to a slider 61.

On the upper surface and both side surfaces of the slider 61, a pair of rods 66 and a pair of coil body positioning plates are provided, respectively.
50 are erected vertically. The rod 66 penetrates the current transformer output section 31. This penetration allows the current transformer 30 to move up and down when the coil body up-and-down motor 42 is operated.
When 66 moves horizontally, the current transformer 30
The penetration is so tight that it moves horizontally in synchronization with the movement of 66.

As shown in FIG. 3, the pair of coil positioning plates 50 have a tip portion 51 formed in a substantially circular shape in plan view, and the tip portions 51 are used to position the coil body 10 with respect to the tooth 1. Abut 51 against the tooth flank 4 of tooth 1.
Thus, when the tip end portions 51 of the pair of coil positioning plates 50 are brought into contact with the tooth side portions 4 of the tooth 1, in plan view,
The heating coil 11 and the jacket 20 are located between the teeth 5, and
The tip portion 11a of the heating coil 11 and the side surface 12a of the core 12 are arranged close to the tooth bottom portion 3 and the tooth side portion 4 with a predetermined distance, and the tip portion 20a and the side surface 20b of the jacket 20 are also arranged. The coil body is arranged so that the tooth bottom portion 3 and the tooth side portion 4 are arranged close to each other at a predetermined distance, and further, the core 15 is arranged closely to the tooth tip portion 2 at a predetermined distance. 1
The relative positions of 0, the jacket 20, the core 15, and the coil positioning plate 50 are set.

The work rotating mechanism B supports an annular work cradle 71 for supporting the peripheral portion of the horizontally arranged gear W, an annular thrust bearing 72 for supporting the work cradle 71, and a thrust bearing 72. A cylindrical base 73 fixed on the common base D is provided. The base 73 is provided with an opening 76, and the slider 61 is arranged so as to penetrate the opening 76. Therefore, the hydraulic cylinder 62 is arranged inside the base 73.

The work rotating mechanism B also includes the teeth 1 of the gear W.
Pinion 81 that meshes with and rotates gear W, and vertical gear drive shaft 82 with pinion 81 attached to the upper end.
And a sleeve-shaped bearing 83 that supports the shaft 82 on the common base D.
And a gear drive motor 84 with a reduction mechanism connected to the lower end of the gear drive shaft 72. A disc 85 is attached to the gear drive shaft 82, and a pinion is provided around the disc 85.
The same number of protrusions 86 as the number of teeth of 81 (12 in this embodiment) are provided at equal intervals. Reference numeral 87 is a proximity switch which is activated by the projection 86 and issues a signal to the control device C to stop the gear drive motor 84.

The controller C has a built-in microcomputer, sequencer or the like. The controller C is set in advance for the number of times of quenching (number of teeth) for one gear W, the quenching condition of each tooth (heating coil). The magnitude of the high-frequency current to be supplied to 11, the energization time, the injection start timing of the quenching cooling liquid injected by the jacket 20, the injection time, etc.) are set. Based on these settings, the controller C controls the high-frequency power source, a valve (not shown) that controls the start and stop of injection of the quenching cooling liquid, the coil body lifting motor 42, the gear drive motor 84, the hydraulic cylinder 62, and the like.

Next, a method of quenching the tooth bottom portion 3 and the tooth side portion 4 of each tooth 1 of the gear W by the above apparatus will be described. First, the controller C is set as described above. Then the control device
The coil body raising / lowering motor 42 is operated via C (hereinafter, even if the control is performed via the control device C, this is not particularly mentioned) to hold the current transformer 30, that is, the coil body 10 at the highest position.

Then, the gear W is placed on the work support 71 and the pinion 81 and the tooth 1 are meshed with each other. At this time, any tooth
The root portion 3 of 1 is located at a position facing the coil body 10. Next, the coil body lifting motor 42 is operated to lower the coil body 10 and the jacket 20 below the gear W, and the hydraulic cylinder 62 is operated to attract the piston 64 and move the slider 61 toward the hydraulic cylinder 62. Let The operation of the slider 61 causes the coil body 10 to move to a pair of rods.
Move toward the center of the gear W via 66.

This state of the coil body 10 is the position at which the hardening of the tooth 1 is started.
It is the position where the movement in the direction of the arrow S shown in is finished. Next, the slider 61 is moved forward by the hydraulic cylinder 62 in the direction of arrow P, and the tip portions 5 of the pair of coil positioning plates 50 are moved.
As shown in FIG. 3, when the tooth 1 is brought into contact with the tooth side portion 4 of the tooth 1, the gear W is fixed and the tooth gap 5 of the tooth 1 is at the quenching position.
The coil body 1 is positioned in the
0 and the jacket 20 is Ru Do <br/> the state of being inserted into the interdental 5. The coil body 10 and the jacket 20 are inserted into the interdental space 5.
In this state, the tip portion 11a of the heating coil 11 and the tip portion 20a of the jacket 20 are separated from the tooth bottom portion 3 by a predetermined distance, and the side surface 12a of the core 12 and the side surface 20b of the jacket 20 are separated from the tooth side portion 4 by a predetermined distance. At a distance of
Further, the core 15 is disposed close to the tooth tip 2 with a predetermined distance. At this point, the coil body 1
0 and the jacket 20 are still inserted in the interdental space 5.
Instead, it is located below the interdental space 5.

Next, after the energization of the heating coil 11 and the jetting of the quenching cooling liquid from the jacket 20 are started,
The operation of the coil body lifting motor 42 is started, and the coil body 1
0, the jacket 20 and the core 15 are moved upward in the direction of the arrow Q and passed through the interdental space 5 from the bottom to the top to move and quench the tooth bottom part 3 and the tooth side part 4. At this time, one pair
The coil positioning plate 50 of does not move and keeps the gear W fixed.
It Then, when the jacket 20 comes above the teeth 1, the coil body lifting motor 42 is stopped and the heating coil 1
The energization of 1 and the injection of the quenching cooling liquid from the jacket 20 are stopped.

Thereafter, the hydraulic cylinder 62 and the coil body raising / lowering motor 42 are sequentially operated to first retract the coil body 10, the jacket 20, the core 15 and the coil positioning plate 50 in the direction of the arrow R, and then the coil body 10 , The jacket 20 and the core 15 are lowered in the direction of arrow S to return to the position at the start of quenching.

Then, the gear drive motor 84 is driven to rotate the pinion 81. When the pinion 81 rotates by one tooth, the protrusion 86 of the cam 85 approaches the proximity switch 87 and operates the proximity switch 87 to stop the rotation of the gear drive motor 84. At this time, the gear W is also rotating by one tooth.

After this, the second quenching is performed. That is, the hydraulic cylinder 62 is operated to bring the coil positioning plate 50 into contact with the tooth side portion 4, and when viewed in a plan view, the coil body 10 and the jacket 20 are similar to the case of the first quenching, and the tooth bottom portion 3 and the tooth side portion 4 are the same. The core (15) is disposed close to the part (4) and the core (15) is close to the tip part (2) at a predetermined distance. Next, after quenching similar to the first quenching, the hydraulic cylinder 62 and the coil body lifting motor 42 are operated to operate the coil body 1.
0, the jacket 20, the core 15, and the coil positioning plate 50 are returned to the initial positions to complete the second quenching. Follow the same procedure to quench all teeth 1.

In the present embodiment, after the tooth root portion 3 and the tooth side portions 4 on both sides thereof are hardened, the tooth bottom portion 3 adjacent to the tooth root portion 3 and the tooth side portions 4 on both sides thereof are hardened. The method has been described, but the method is not limited to this method, and considering the reduction of gear distortion due to quenching, etc. Quenching 4 and 4 is also performed. In this case, the controller C may be given such an instruction.

[0034]

As described above, in the internal gear quenching method and apparatus of the present invention, the internal gear is arranged horizontally and rotatably around the center of the gear by the pinion engaged with the gear. After that, a coil body for high-frequency induction heating the tooth bottom portion and tooth side portion of the gear, a jacket integrally connected to the coil body below the coil body, and the same height on both sides of the coil body as the coil body. A pair of magnetic bodies that are integrally connected to the coil body and are disposed close to the tooth tips on both sides between the teeth when the coil body is inserted between the teeth of the gear. A pair of coil positioning plates, which are arranged on both sides of the coil body at substantially the same height as the gear and horizontally move in synchronization with the coil body, are provided on both sides of the coil body. , Coil body, jacket and magnetic body The coil positioning plate is moved horizontally toward the teeth, the tip end of the coil positioning plate is inserted between the teeth and brought into contact with the tooth side portions, and the coil body and the jacket are positioned below the teeth, and then the coil body and the jacket are removed. Between the lower part of the tooth and the upper part of the tooth, a high-frequency current is applied to the coil body during this period, and quenching cooling liquid is jetted from the jacket to quench the tooth bottom part and the tooth side part. After moving the body and the coil positioning plate horizontally toward the center of the gear to move it away from the interdental space and lowering it, and driving the pinion to rotate the internal gear by a predetermined number of teeth, the same as above. Is repeatedly quenched.

Therefore, according to the internal gear hardening method and apparatus of the present invention, the bottom of the tooth and the side of the tooth can be hardened by repeatedly mechanically disposing the coil body and the jacket at predetermined positions between the teeth. Therefore, it is possible to reduce the trouble when quenching the internal gear.
can do. Moreover, coil body and jacket
When positioning the, the gear is rotated by the inner pinion.
The coil positioning plate toward the teeth,
By inserting the tip of the positioning plate between the teeth,
Fix the gear and position the teeth at the quenching position
Then, in this state, put the coil body and jacket up
Since the means of moving the coil body to the
Position the jacket and jacket with a simple mechanism with high precision
be able to. Furthermore, since the gear is set horizontally, the teeth
Surface is oriented vertically and the jar is installed below the coil body.
Is the quenching liquid ejected from the ket almost on the tooth surface during heating?
Because it is difficult to make uneven baking, good quenching quality is required.
It can also be secured.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional front view of an embodiment of the present invention.

FIG. 2 is an explanatory plan view taken along line XX of FIG.

FIG. 3 is an enlarged plan view of an essential part of an embodiment of the present invention.

FIG. 4 is a plan view of a disk and a proximity switch according to an embodiment of the present invention.

FIG. 5 is a perspective view of a coil body according to an embodiment of the present invention.

FIG. 6 is a perspective view of a jacket according to an embodiment of the present invention.

[Explanation of symbols]

 A Quenching mechanism B Work rotation mechanism C Controller W Internal gear 1 Tooth 2 Tooth tip 3 Tooth bottom 4 Tooth side 5 Tooth gap 10 Coil body 15 Core 20 Jacket 33 Slider 34 Rod 36 Transformer base 37 Slider 39 Output Axis 42 Coil body lifting motor 50 Coil positioning plate 51 Tip 61 Slider 62 Hydraulic cylinder 63 Rod 64 Piston 66 Rod 71 Work cradle 72 Thrust bearing 81 Pinion 84 Gear drive motor 85 Disk 87 Limit switch

Claims (3)

[Claims] 1. A method for quenching an internal gear according to claim 1, wherein after the gear is arranged horizontally and rotatably around the center of the gear by a pinion meshing with the gear, a bottom portion and a tooth side portion of the gear are provided. A coil body for high-frequency induction heating, a jacket integrally joined to the coil body below the coil body, and a coil body integrally joined to the coil body at both sides of the coil body at the same height as the coil body. When the gears are inserted between the teeth of the gear, they are arranged close to the tooth tips on both sides between the teeth.
While arranging a pair of magnetic bodies under the inside of the gear,
A pair of coil positioning plates, which are arranged on both sides of the coil body at substantially the same height as the gear and horizontally move in synchronization with the coil body, are provided, and then the coil positioning plate, the coil body, and the jacket. Then, the magnetic body is horizontally moved toward the teeth, the tip of the coil positioning plate is inserted between the teeth to abut against the tooth side, and the coil body and the jacket are positioned below the interdental space. The body and the jacket are moved from the lower part to the upper part between the teeth, and a high-frequency current is applied to the coil body during this period, and quenching cooling liquid is jetted from the jacket to quench the tooth bottom part and the tooth side part, and then the coil body. , The jacket, the magnetic body, and the coil positioning plate are moved horizontally toward the center of the gear to move them away from the space between the teeth and then to descend, and the pinion is driven to rotate the internal gear by a predetermined number of teeth. Inner surface gear quenching method and repeating the quenching similar to the above. 2. An internal gear quenching apparatus for quenching a horizontally arranged internal gear, comprising a quenching mechanism and a work rotating mechanism, wherein the quenching mechanism is arranged inside the gear and A coil body for high-frequency induction heating of the tooth bottom portion and the tooth side portion, a jacket integrally coupled with the coil body below the coil body for injecting quenching cooling liquid, and a coil body on both sides of the coil body. A pair of magnetic bodies that are integrally connected to the coil body at the same height and are arranged close to the tooth tips on both sides between the teeth when the coil body is inserted between the teeth of the gear; It is arranged on both sides at the same height as the gear inside and moves horizontally in synchronization with the coil body, and when the coil body is inserted between the teeth, between the pair of teeth on both sides between the teeth. A pair of coil positioning plates that are inserted and whose tips come into contact with the tooth sides, And a means for vertically moving the jacket and the coil positioning plate in synchronization with each other, and means for moving up and down the coil body and the jacket.
It is characterized by further comprising: a work cradle that supports a peripheral portion of the gear and is rotatable about a vertical axis; a pinion that meshes with the gear to rotate the gear; and a means that rotationally drives the pinion. Internal gear hardening device. 3. A disk having projections formed at the same number as the number of teeth of the pinion at equal intervals and attached to a means for rotationally driving the pinion, and a means for rotationally driving the pinion operated by the projections. The internal gear hardening device according to claim 3, further comprising a switch that issues a signal for stopping the rotational drive of the pinion.