JP6568696B2 - Heating apparatus and heating method - Google Patents

Description

  The present invention relates to a heating apparatus and a heating method for induction heating the teeth of an internal ring gear one by one.

  The teeth of the steel gear are subjected to heat treatment such as quenching for the purpose of increasing hardness, for example, and induction heating is used as one of heating methods in the heat treatment. A relatively large gear is generally induction-heated one tooth at a time.

  Typically, the heating device for induction heating the teeth of the internal ring gear one by one is typically a rotary table on which the central ring gear is placed with the central axis of the internal ring gear as vertical, and an internal mounted on the rotary table. And a heating coil moved in the vertical direction along the teeth of the tooth ring gear.

  The internal ring gear is arranged coaxially with the rotary shaft of the rotary table and is fixed to the rotary table. The heating coil is moved in the vertical direction, and one tooth in which the heating coil is disposed in proximity is induction-heated by the heating coil. The rotary table is rotated, and an arbitrary number of teeth are sent close to the heating coil. As a result, the teeth of the internal ring gear are induction-heated one by one.

  Then, the heating coil is guided by a copying roller that engages with a tooth in the vicinity of the induction-heated tooth and moves together with the heating coil, so that the coil gap between the heating coil and the induction-heated tooth Is preserved. There is also known a heat treatment apparatus that includes a sensor that detects the position of a tooth and is configured to move a heating coil so that a coil gap is maintained (see Patent Document 1).

Japanese Patent Publication No. 5-16156

  The internal ring gear is deformed by heating, and in the induction heating by one tooth, the center axis of the internal ring gear may deviate from the rotation axis of the rotary table as the heat treatment proceeds. When the central axis of the internal tooth ring gear deviates from the rotation axis of the rotary table, as the rotary table rotates, the relative posture between the heating coil and the tooth in which the heating coil is disposed changes, and the induction heating is biased. There is a possibility that the quality of the heat treatment may deteriorate.

  Although it is conceivable that the center axis of the internal ring gear and the rotary shaft of the rotary table are aligned at any time, the friction between the internal ring gear mounted on the rotary table and the rotary table causes the movement of the internal ring gear. Hinder. It is difficult to move the large internal ring gear on the rotary table more accurately as the amount of deformation due to heating is large and the larger the internal ring gear is likely to be displaced from the rotary shaft of the rotary table.

  This invention is made | formed in view of the situation mentioned above, It aims at providing the heating apparatus and heating method which can stabilize the heat processing quality and can automate heat processing.

  A heating device according to one aspect of the present invention is a heating device that induction-heats teeth of an internal ring gear one by one, on which the internal ring gear having a horizontal central axis is placed, and an outer periphery of the internal ring gear A set of supports that can roll the surface, and the teeth of the internal ring gear arranged at a predetermined processing position with respect to the set of supports between the set of supports. The teeth are heated by induction, and the heating coil retracted from the teeth and the internal ring gear mounted on the pair of supports are rotated, and the teeth arranged at the position to be processed are arbitrarily toothed. A first driving unit that sends the number of the first driving unit.

  The heating method according to one aspect of the present invention is a heating method in which the teeth of the internal ring gear are induction-heated one by one, and the internal ring gear having a horizontal central axis is rotated on the outer peripheral surface of the internal ring gear. It is mounted on a set of movable supports, the internal ring gear mounted on the set of supports is rotated, and the set of supports is placed between the sets of supports. On the other hand, teeth arranged at a predetermined position to be processed are sequentially fed by an arbitrary number of teeth, and a heating coil is arranged close to the teeth of the internal ring gear arranged at the position to be processed to inductively heat the teeth.

  ADVANTAGE OF THE INVENTION According to this invention, the heat processing quality can be stabilized and the heating apparatus and the heating method which can automate heat processing can be provided.

It is a perspective view which shows the structure of an example of the heating apparatus for describing embodiment of this invention. It is a front view of the heating apparatus shown in FIG. In the heating apparatus shown in FIG. 1, it is a perspective view which shows the state which removed the internal ring gear. It is a flowchart explaining operation | movement of the heating apparatus shown in FIG. It is a principal part perspective view which shows the structure of the other example of the heating apparatus for describing embodiment of this invention.

  FIG. 1 is a perspective view showing a configuration of an example of a heating device for explaining an embodiment of the present invention, FIG. 2 is a front view of the heating device of FIG. 1, and FIG. It is a perspective view which shows the state which removed the tooth ring gear.

  A heating apparatus 1 shown in FIG. 1 is a heating apparatus that heats tooth spaces of a steel internal tooth ring gear 2 one by one by induction heating. The heating device 1 includes a pair of support rollers (supports) 3 that support the internal ring gear 2, a heating coil 4 that induction-heats the teeth of the internal ring gear 2, and a pinion gear that rotates the internal ring gear 2 ( 1st drive part) 5.

  The set of support rollers 3 is disposed on the upper surface of the stage 6 so that the respective rotation axes are horizontal and parallel to each other. The internal ring gear 2 is placed on the set of support rollers 3 with the center axis being horizontal and parallel to the rotation axis of the support roller 3.

  Each of the set of support rollers 3 is provided with a flange 3 a that can abut against one end face of the internal ring gear 2, and the stage 6 has an internal tooth mounted on the set of support rollers 3. A pressing portion 7 that presses the ring gear 2 toward each flange 3 a of the pair of support rollers 3 is provided. The internal ring gear 2 is pressed by the pressing portion 7 and comes into contact with the flange 3 a, and is positioned on the set of support rollers 3 in the extending direction of the rotation shaft of the support roller 3.

  The heating coil 4 is connected to a transformer 9 via a coil lead 8, and high frequency power is supplied to the heating coil 4 from a high frequency power source (not shown) through the transformer 9 and the coil lead 8.

  In the vicinity of the stage 6, a Y table (second drive unit) 10 that can move in the Y-axis direction parallel to the central axis of the internal ring gear 2 mounted on a pair of support rollers 3, and a vertical direction ( A Z table 11 supported by the Y table 10 so as to be movable in the Z axis direction) is provided, and the transformer 9 is mounted on the Z table 11.

  The Y table 10 is moved back and forth in the Y-axis direction by driving means such as a motor, and when the Y table 10 is moved, the heating coil 4 connected to the transformer 9 is moved in the Y-axis direction. The Z table 11 is also moved back and forth in the Z-axis direction by driving means such as a motor, and when the Z table 11 is moved, the heating coil 4 connected to the transformer 9 is moved in the Z-axis direction.

  The heating coil 4 is a tooth groove of the internal ring gear 2 arranged at a predetermined position with respect to the set of support rollers 3 between the set of support rollers 3 by the movement of the Y table 10 and the Z table 11. And is retracted from the tooth gap. A predetermined gap (hereinafter referred to as a coil gap) is formed between the heating coil 4 disposed close to the tooth gap and the facing surface of the heating coil 4 in the tooth gap. In this state, high-frequency power is supplied to the heating coil 4, and the opposing surface of the tooth space is induction-heated.

  The position to be processed in which the tooth groove that is induction-heated by the heating coil 4 is disposed is not particularly limited as long as it is between the pair of support rollers 3. For example, as shown in the illustrated example, Can be central.

  The pinion gear 5 is rotated at a desired rotation angle by a driving means such as a motor, meshes with the internal ring gear 2 placed on the set of support rollers 3, and rotates the internal gear ring gear 2. When the set of support rollers 3 rolls on the outer peripheral surface of the internal ring gear 2, the internal ring gear 2 is smoothly rotated. Then, with the rotation of the internal ring gear 2, the tooth spaces arranged at the position to be processed are sequentially sent by an arbitrary number of teeth. Instead of the pinion gear 5, the internal ring gear 2 may be rotated by rotating the support roller 3.

  The heating device 1 further includes an engagement portion 12 that positions a tooth groove sent by the rotation of the internal ring gear 2 at a position to be processed. The engaging portion 12 is moved toward the outer diameter side inside the internal ring gear 2 by a driving means such as an air cylinder, and is engaged with the teeth of the internal ring gear 2 at a predetermined position with respect to the set of support rollers 3. Match. When the rotation angle of the internal ring gear 2 is deviated, the internal ring gear 2 is pressed and rotated by the engagement with the engaging portion 12, and the tooth groove is positioned at the processing position. At this time, the set of support rollers 3 rolls on the outer peripheral surface of the internal ring gear 2, whereby the internal ring gear 2 is smoothly rotated.

  The engaging portion 12 is preferably engaged with the teeth of the internal ring gear 2 between a pair of support rollers 13 provided with a position to be processed. Thereby, the positioning accuracy of the tooth gap to the processing position can be increased.

  In the case where the engaging portion 12 is configured to fit into the tooth groove of the internal ring gear 2, at least one engaging portion 12 may be provided. Moreover, when a pair of engaging parts 12 are provided symmetrically across the diameter of the internal ring gear 2 passing through the center of the pair of support rollers 13 as in the illustrated example, each of the engaging parts 12 is It is not necessary to fit into the tooth groove of the internal ring gear 2, and it is possible to use the engaging portion 12 in common with various tooth-shaped internal ring gears.

  Note that the engaging portion 12 may be omitted when the tooth groove can be accurately positioned at the processing position by the rotation of the internal ring gear 2 by the pinion gear 5 or the support roller 3.

  The heat treatment using the heating device 1 configured as described above will be described with reference to the flowchart of FIG. 4, taking as an example the case where the teeth of the internal ring gear 2 are quenched.

  First, the internal ring gear 2 is placed on the set of support rollers 3 (step S1).

  Next, the engaging portion 12 is engaged with the teeth of the internal ring gear 2, and the tooth groove of the internal ring gear 2 that performs induction heating first is positioned at the processing position (step S2).

  Next, the Y table 10 and the Z table 11 are moved, and the heating coil 4 is disposed close to the tooth gap at the processing position (step S3).

  Next, high frequency power is supplied to the heating coil 4 disposed close to the tooth gap at the position to be processed, and quenching (induction heating) is started on the facing surface of the tooth gap (step S4).

  In this example, the dimension in the tooth width direction of the heating coil 4 is smaller than the tooth width of the internal ring gear 2, and the Y table 10 is moved there, and the heating coil 4 induction-heats the facing surface of the tooth gap. However, the tooth gap is moved from one end side to the other end side in the tooth width direction (step S5).

  In the quenching, the opposing surface of the induction-heated tooth gap is rapidly cooled. For example, a nozzle for injecting a cooling liquid is provided integrally with the heating coil 4 behind the heating coil 4, and the cooling liquid is directed from the nozzle toward the tooth gap. The opposed surfaces of the injected and induction-heated tooth gap are quenched.

  In addition, from the viewpoint of improving the positional accuracy of the heating coil with respect to the tooth groove at the processing position, the tooth of the tooth groove near the processing position is moved integrally with the heating coil 4 while maintaining the positional relationship with the heating coil 4. A distance sensor that detects the distance between the bottom surface and the tooth side surface may be used, and the heating coil 4 may be moved and the internal ring gear 2 may be rotated based on the output of the distance sensor.

  After the heating coil 4 is moved from one end of the tooth gap to the other end, the supply of high-frequency power to the heating coil 4 is cut off, and the heating coil 4 and the engaging portion 12 are retracted from the tooth gap, respectively, Quenching of the tooth gap is completed (step S6).

  Subsequently, the pinion gear 5 is rotated to rotate the internal tooth ring gear 2, and the tooth spaces arranged at the processing position are sent by an arbitrary number of teeth (step S7).

  The above steps S2 to S7 are repeated until the quenching of all the tooth gaps is completed, and all the teeth of the internal ring gear 2 are quenched one by one.

  In the above heat treatment, due to the heat treatment (induction heating) for each tooth, the distortion of the internal ring gear 2 gradually reaches the entire circumference of the internal ring gear 2 as the heat treatment proceeds. However, the center axis is horizontal and parallel to the rotation axis of the set of support rollers 3, and the internal ring gear 2 is placed on the set of support rollers 3, and the processing position between the set of support rollers 3. In this heating apparatus 1 for induction heating the tooth grooves arranged on the inner ring gear 2, the distortion of the internal ring gear 2 that affects the relative posture of the heating coil 4 and the tooth grooves induction-heated by the heating coil 4 is a set of support rollers. 3 is limited to the distortion of a partial section of the internal ring gear 2 disposed between the three.

  Therefore, according to the present heating device 1, even if heat treatment (induction heating) is performed one tooth at a time, the influence of distortion of the internal ring gear 2 is reduced, and the heating coil 4 and the tooth are all teeth of the internal ring gear 2. The coil gap between the opposing surfaces of the grooves is kept substantially constant. Thereby, the heat treatment quality of the internal ring gear 2 can be stabilized and the heat treatment can be automated.

  In the heating device 1, the tooth gap of the internal ring gear 2 has been described as being induction-heated. However, the heating coil 4 may be disposed close to the tooth crest and the tooth crest may be induction-heated.

  Moreover, in the heating apparatus 1, the dimension of the heating coil 4 in the tooth width direction is smaller than the tooth width of the internal ring gear 2, the Y table 10 is moved, and the heating coil 4 induction-heats the facing surface of the tooth gap. However, instead of moving the Y table 10, the stage 6 on which the pair of support rollers 3 are arranged is described as being moved from one end side to the other end side of the tooth gap in the tooth width direction. The heating coil 4 may be moved in the Y-axis direction, thereby moving the heating coil 4 relatively in the tooth width direction.

  In addition, as shown in FIG. 5, a heating coil 4 that covers the teeth of the internal tooth ring gear 2, that is, a heating coil 4 whose dimension in the tooth width direction is larger than the tooth width of the internal tooth ring gear 2 may be used. The teeth can be induction-heated without relatively moving the heating coil 4 in the tooth width direction. In the example shown in FIG. 5, the heating coil 4 is disposed close to the tooth crest to inductively heat the tooth crest, but the tooth gap may be induction heated.

  As described above, the heating device disclosed in the present specification is a heating device that induction-heats teeth of the internal ring gear one by one, and the internal ring gear with the central axis being horizontal is placed, A set of supports capable of rolling on the outer peripheral surface of the internal ring gear, and the internal ring gear disposed between the set of supports at a predetermined position with respect to the set of supports. The heating coil retracted from the teeth and the internal ring gear mounted on the set of support members are rotated and arranged at the position to be processed. A first driving unit that sends an arbitrary number of teeth.

  Further, the heating device disclosed in the present specification is moved toward the outer diameter side of the inner ring gear, and engages with the teeth of the inner ring gear at a predetermined position with respect to the set of supports. At least one engaging part is further provided.

  Moreover, as for the heating apparatus disclosed by this specification, the said engaging part engages the tooth | gear of the said internal ring gear between the said one set of support bodies.

  The heating device disclosed in the present specification is a heating device in which a pair of the engaging portions are provided symmetrically across the diameter of the internal ring gear that passes through the processing position.

  In addition, the heating device disclosed in the present specification includes the internal ring gear mounted on the set of supports and the heating coil disposed in proximity to the teeth disposed at the processing position. A second drive unit that relatively moves in an axial direction of the internal ring gear; and the second drive unit moves the internal ring gear and the heating coil relative to each other in the axial direction of the internal ring gear. The teeth placed at the treatment position are induction heated.

  Further, the heating method disclosed in the present specification is a heating method in which the teeth of the internal ring gear are induction-heated one by one, and the internal ring gear having a horizontal central axis is connected to the outer peripheral surface of the internal ring gear. It is mounted on a set of supports that can roll, and the internal ring gear mounted on the set of supports is rotated so that the set of supports is between the sets of supports. The teeth arranged at a predetermined position to be processed are sequentially fed by an arbitrary number of teeth, and a heating coil is arranged close to the teeth of the internal ring gear arranged at the position to be processed to heat the teeth.

Reference Signs List 1 Heating device 2 Internal ring gear 3 Support roller (support)
4 Heating coil 5 Pinion gear (first drive part)
6 Stage 7 Press part 8 Coil lead 9 Transformer 10 Y table (2nd drive part)
11 Z table 12 engagement part

Claims (6)

A heating device for induction heating the teeth of the internal ring gear one by one,
A set of supports on which the inner ring gear with a central axis horizontal is mounted and capable of rolling on the outer peripheral surface of the inner ring gear;
Between the set of supports, the teeth are placed in proximity to the teeth of the internal ring gear arranged at a predetermined position with respect to the set of supports to inductively heat the teeth, and are retracted from the teeth. Heating coil
A first drive unit that rotates the internal gear ring gear mounted on the set of support members and sends an arbitrary number of teeth arranged at the processing position;
A heating device comprising: The heating device according to claim 1,
A heating apparatus further comprising at least one engaging portion that is moved toward the outer diameter side of the inner ring gear and engages with the teeth of the inner ring gear at a predetermined position with respect to the set of supports. The heating device according to claim 2,
The engaging portion is a heating device that engages teeth of the internal ring gear between the pair of supports. The heating device according to claim 3,
A pair of heating devices provided symmetrically with respect to the diameter of the internal ring gear passing through the processing position. The heating device according to any one of claims 1 to 4,
A second drive unit that relatively moves the internal ring gear mounted on the set of supports and the heating coil disposed close to the teeth disposed at the processing position in the axial direction of the internal ring gear. Further comprising
A heating device that induction-heats the teeth arranged at the processing position while relatively moving the internal ring gear and the heating coil in the axial direction of the internal ring gear by the second drive unit. A heating method for induction heating the teeth of the internal ring gear one by one,
The inner ring gear with the central axis horizontal is placed on a set of supports capable of rolling the outer peripheral surface of the inner ring gear,
The internal gear ring gear mounted on the set of supports is rotated, and teeth arranged at predetermined processing positions with respect to the set of supports between the set of supports are arbitrarily selected. Sequentially feed the number of teeth,
A heating method in which a heating coil is arranged close to the teeth of the internal ring gear arranged at the processing position and the teeth are induction-heated.

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