JP5903455B2 - Heat treatment apparatus and heat treatment method - Google Patents

Description

  The present invention relates to a heat treatment apparatus and a heat treatment method for performing heat treatment over the entire circumference of a circumferential surface of an annular workpiece.

  Conventionally, there has been known a heat treatment technique in which only a surface layer of a steel material made of an iron-based metal is hardened and the inside is kept tough to give wear resistance and fatigue resistance. Examples of this type of surface hardening include quenching, carburizing, and nitriding.

  As a method of surface hardening treatment for an annular member made of steel, for example, quenching using a heating coil is used. Specifically, a quenching device is known in which an annular member is heated using one or two heating coils, and then rapidly cooled and quenched. For example, in Patent Document 1 below, the outer periphery of a ring work is heated using two or more even number of movable high frequency inductors, and the coolant is ejected from the coolant ejection holes provided in the high frequency inductor. Discloses an induction hardening method in which a ring work is cooled and quenched.

Japanese Patent Publication No. 36-505

  By the way, in order to quench the workpiece as a material to be processed, after heating the workpiece so as to be equal to or higher than the temperature at which the workpiece becomes austenite, the workpiece is in the austenite state and below the temperature of the martensite start (Ms) point. It is necessary to cause the transformation of the work structure from austenite to martensite.

  Therefore, when the workpiece is not heated above the temperature at which the workpiece is austenitized, the workpiece cannot be quenched. Further, even if the workpiece can be heated once more than the temperature at which the workpiece becomes austenitic, if the workpiece is not properly cooled thereafter, the workpiece cannot be quenched. Furthermore, after the workpiece is heated and cooled, that is, after the workpiece is quenched, if the workpiece is heated again, annealing occurs and the surface layer of the workpiece is softened.

  As described above, for example, when the annular workpiece is quenched by moving the two heating coils in opposite directions as in the heat treatment apparatus described in Patent Document 1 listed above, there is an annular workpiece. When the quenching is started from the portion where the quenching is started (hereinafter referred to as “quenching start”), and the quenching is started from the portion where the quenching is started, the portion where the quenching is finished (hereinafter referred to as “the quenching end”) is particularly selected. In the quenching of the workpiece, there is a problem that a joint is generated in the heat treatment and it is difficult to form a uniform hardened layer.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat treatment apparatus and a heat treatment method capable of realizing that uniform heat treatment is performed over the entire circumference of the circumferential surface of the annular workpiece. Is to provide.

  A heat treatment apparatus according to the present invention includes a table on which an annular work can be placed, and a pair of heat treatment parts for heat-treating a peripheral surface of the work, and the pair of heat treatment parts includes the workpiece. A heat treatment apparatus used to obtain a workpiece having a desired property by subjecting the workpiece to heat treatment while moving in opposite directions along the circumferential surface of the workpiece. A heating coil that can be disposed to face the peripheral surface, a first cooling water discharge portion that is provided alongside the heating coil and discharges cooling water, and is installed at a position overlapping the heating coil and cooling water A second cooling water discharge portion for discharging the heat treatment portion, when the pair of heat treatment processing portions move in directions opposite to each other along the peripheral surface of the workpiece, When the peripheral surface of the heated workpiece is sequentially cooled by the cooling water discharged from the first cooling water discharge portion and the pair of heat treatment processing portions move to adjacent positions, the workpiece is heated by the heating coil. Further, the cooling of the peripheral surface of the work is performed including the cooling water discharged from the second cooling water discharge portion, whereby heat treatment is performed over the entire periphery of the peripheral surface of the work. Is.

  In addition, the heat treatment method according to the present invention can be disposed opposite to the work surface, a table on which an annular work can be placed, a pair of heat treatment parts for heat-treating the work surface. A heating coil, a first cooling water discharge portion that is provided in the heating coil and discharges the cooling water, and a second cooling that is installed at a position overlapping the heating coil and discharges the cooling water. By using a heat treatment apparatus including a water discharge portion, the pair of heat treatment processing portions perform heat treatment on the workpiece while moving in opposite directions along the peripheral surface of the workpiece, thereby obtaining desired properties. In the heat treatment method for obtaining a workpiece having the workpiece, when the pair of heat treatment portions move in opposite directions along the circumferential surface of the workpiece, the circumference of the workpiece heated by the heating coil is obtained. Are sequentially cooled by the cooling water discharged from the first cooling water discharge part, and when the pair of heat treatment parts move to adjacent positions, cooling of the peripheral surface of the workpiece heated by the heating coil, It is carried out including the cooling water discharged from the second cooling water discharge portion, and heat treatment is performed over the entire circumference of the peripheral surface of the workpiece.

  ADVANTAGE OF THE INVENTION According to this invention, the heat processing apparatus and the heat processing method for performing uniform heat processing over the perimeter of a cyclic | annular workpiece | work can be provided.

It is the schematic which shows the basic structural example of the heat processing apparatus which concerns on this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the basic operation example of the heat processing apparatus which concerns on this embodiment, the partial diagram (a) in a figure is a schematic diagram which shows the state of a firing start, and the partial diagram (b) in a figure is a firing. It is the schematic which shows the state between the beginning and the end of baking, and the partial figure (c) in the figure and the partial figure (d) are the schematic diagrams which show the state of the end of baking. It is the schematic for demonstrating the state which discharged | emitted cooling water by the 1st cooling water discharge | release part and the 2nd cooling water discharge | release part in the end of baking of the heat processing apparatus which concerns on this embodiment. It is a figure which shows the example of a whole structure of the heat processing apparatus which concerns on this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating the table of the heat processing apparatus which concerns on this embodiment, and the fractional figure (a) in a figure is a top view of the table of the heat processing apparatus which concerns on this embodiment, b) is a side view of the table of the heat treatment apparatus according to the present embodiment. It is the schematic for demonstrating the heating coil of the heat processing apparatus which concerns on this embodiment. It is a perspective view containing the partial cross section of a slewing bearing. It is sectional drawing of a slewing bearing. It is the schematic for showing the various structural examples of the heat processing apparatus which concerns on this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  First, a basic configuration example of the heat treatment apparatus according to the present embodiment will be described with reference to FIGS. 1 and 3. Here, FIG. 1 is a schematic diagram illustrating a basic configuration example of the heat treatment apparatus according to the present embodiment. FIG. 3 is a schematic diagram for explaining a state in which cooling water is discharged by the first cooling water discharge portion and the second cooling water discharge portion at the end of the heat treatment apparatus according to the present embodiment.

  As shown in FIG. 1, a heat treatment apparatus 100 according to this embodiment includes a table 11 on which an annular workpiece W can be placed, and a pair of heat treatment portions 20 (for heat treatment of the peripheral surface of the workpiece W). 20a, 20b).

  The workpiece W is a processing material to be heat-treated. The workpiece W in the present embodiment is, for example, an outer ring or an inner ring constituting a slewing bearing, and has a substantially trapezoidal shape or a substantially rectangular shape in cross section. The heat treatment is performed on the rolling element rolling surface of the slewing bearing.

  The table 11 can place the workpiece W, and the table 11 according to the present embodiment has a substantially circular shape in plan view. Then, by placing and fixing the workpiece W on the table 11 by a crane 17 which will be described later, it is possible to perform a heat treatment process. And the table 11 is comprised so that it can rotate by making the center of the table 11 into a rotation center axis | shaft (However, in this embodiment, when performing heat processing, the table 11 is made into the fixed state without rotating. Yes.)

  The heat treatment part 20 is for heat-treating the peripheral surface of the work W, and includes a heating coil 21 (21a, 21b) for heating the work W and a first cooling water discharge for cooling the work W. A portion 23 (23a, 23b) and a second cooling water discharge portion 25 (25a, 25b) for cooling the workpiece W are provided. The heat treatment part 20 is installed on a revolving arm 30 that can be revolved relative to the table 11 so that heat treatment can be performed on the peripheral surface of the workpiece W.

  The heating coil 21 is configured to be disposed so as to face the peripheral surface of the workpiece W. And the surrounding surface of the workpiece | work W can be heated now.

  The 1st cooling water discharge | release part 23 is comprised so that a cooling water can be discharge | released while being attached to the heating coil 21. FIG. And the 1st cooling water discharge | release part 23 is shown in FIG. 3, for example, and the 1st cooling water discharge | release part 23 on the opposite side to the side surface of the 1st cooling water discharge | release part 23 with which the heating coil 21 was attached is provided. A plurality of holes may be formed in the side surface of the slab to release the cooling water. Moreover, it is good also as being able to open a some hole in the surface facing the workpiece | work W of the 1st cooling water discharge | release part 23, and to discharge | release a cooling water. A plurality of holes may be formed in both members of the surface of the cooling water discharge portion 23 facing the workpiece W.

  The 2nd cooling water discharge | release part 25 is comprised so that cooling water can be discharge | released while installing in the position which overlaps with the heating coil 21, for example, as FIG. 3 shows. And a cooling water can be discharge | released by opening a some hole in the surface facing the workpiece | work W of the 2nd cooling water discharge | release part 25, for example. Further, for example, a plurality of holes may be formed in the core of the heating coil 21 so that the cooling water can be discharged. For example, it can be arranged between the copper tubes of the heating coil 21 and the copper tubes so that the plurality of holes of the second cooling water discharge part 25 are located on the surface facing the workpiece W.

  Further, as shown in FIG. 1, in the heat treatment apparatus 100 according to the present embodiment, the cooling device 26 for cooling the work W after the heat treatment processing unit 20 is retracted from the burning end portion of the work W It is fixedly installed on the table 11 which is the end of baking. The cooling device 26 is installed, for example, facing a workpiece W that is an outer ring or an inner ring of a slewing bearing, and a plurality of holes are formed in a surface facing the workpiece W so that cooling water can be discharged. be able to.

  Heretofore, the basic configuration example of the heat treatment apparatus 100 according to the present embodiment has been described. Next, a basic operation example of the heat treatment apparatus according to the present embodiment will be described with reference to FIGS. 2 and 3. Here, FIG. 2 is a schematic diagram showing a state of the heat treatment apparatus according to the present embodiment, and a partial diagram (a) in the drawing is a schematic diagram showing a state of starting firing, and a partial diagram (b) in FIG. ) Is a schematic diagram showing a state between the start and end of firing, and a partial diagram (c) and a partial diagram (d) in the drawing are schematic diagrams showing a state after the firing. In FIG. 2, the shaded portion indicates the portion of the workpiece W that has been heat-treated by the heat treatment apparatus 100 according to the present embodiment.

  In the heat treatment apparatus 100 according to the present embodiment, at the start of firing, as shown in the partial diagram (a) of FIG. 2, the pair of heat treatment parts 20 (20a, 20b) are arranged adjacent to each other.

  The heating coil 21a included in the heat treatment processing portion 20a heats the workpiece W while the heat treatment processing portion 20a on the left side of the drawing moves in the upper left direction along the peripheral surface of the workpiece W. And the workpiece | work W heated by the heating coil 21a will be sequentially cooled by the 1st cooling water discharge | release part 23a. More specifically, the heating coil 21a heats the peripheral surface of the workpiece W on the surface facing the heat treatment processing portion 20a while the heat treatment processing portion 20a pivots in the upper left direction on the paper surface, and then the heated workpiece W is heated. When the first cooling water discharge part 23a discharges the cooling water, the workpiece W is cooled and heat treatment (quenching) is performed.

  On the other hand, as with the heat treatment part 20a on the left side of the paper, the heat treatment part 20b on the right side of the paper moves along the peripheral surface of the workpiece W in the upper right direction on the paper surface, while the heating coil 21b included in the heat treatment part 20b has the workpiece W is heated, and the heated workpiece W is sequentially cooled by the first cooling water discharge portion 23b. More specifically, the heating coil 21b heats the peripheral surface of the workpiece W on the surface facing the heat treatment processing portion 20b while the heat treatment processing portion 20b pivots in the upper right direction on the paper surface, and then the heated workpiece W is heated. When the first cooling water discharge portion 23b discharges the cooling water, the workpiece W is cooled and heat treatment (quenching) is performed.

  By such an operation, the pair of heat treatment parts 20 (20a, 20b) performs heat treatment (quenching) over the entire circumference of the peripheral surface of the workpiece W.

  Then, as shown in the partial diagram (b) of FIG. 2, when the pair of heat treatment parts 20 (20 a, 20 b) are moved to a position approximately halfway between the start and end of firing, substantially half of the workpiece W is obtained. Is heat-treated (quenched).

  In the heat treatment apparatus 100 shown in the partial diagram (b) of FIG. 2, the heat treatment processing unit 20a on the left side of the drawing is included in the heat treatment processing unit 20a while turning in the upper right direction on the drawing along the peripheral surface of the workpiece W. The peripheral surface of the workpiece W is heated by the heating coil 21a, and the heated workpiece W is sequentially cooled by the cooling water discharged from the first cooling water discharge portion 23a that turns.

  Further, the heat treatment processing part 20b on the right side of the paper is heated by heating the peripheral surface of the work W by the heating coil 21b included in the heat treatment processing part 20b while turning in the upper left direction of the paper along the peripheral surface of the work W. Then, the workpiece W is sequentially cooled by the cooling water discharged from the first cooling water discharge portion 23b that turns and moves thereafter.

  By proceeding with the heat treatment as described above, the pair of heat treatment portions 20 (20a, 20b) move to positions adjacent to each other, as shown in the partial diagram (c) of FIG.

  And when a pair of heat processing part 20 (20a, 20b) approaches the end of baking, it has the structure which can heat the end part of the burning of the workpiece | work W by heat conduction by making a turning movement, loosening a moving speed. doing.

  When the pair of heat treatment parts 20 (20a, 20b) move to positions adjacent to each other and the movement of the heating coil 21 (21a, 21b) stops, the heat treatment parts 20 (20a, 20b) are discharged from the first cooling water discharge part 23 (23a, 23b). In addition to the cooling by the cooling water, the cooling is performed including the cooling by the cooling water discharged from the second cooling water discharge portion 25 (25a, 25b). More specifically, for example, as shown in FIG. 3, the cooling water discharged from the side surface of the first cooling water discharge portion 23 (23a, 23b) and the heating coil 21 (21a, 21b) are installed at a position overlapping. The cooling water discharged from the second cooling water discharge portion 25 (25a, 25b) provides cooling of the entire peripheral surface of the workpiece W at the end of firing.

  Then, after the workpiece W is appropriately cooled by the second cooling water discharge part 25 (25a, 25b), the pair of heat treatment parts 20 (20a, 20b) is retracted from the end of firing, and the components shown in FIG. As shown in FIG. 4D, the cooling of the workpiece W is further advanced by the cooling device 26 fixedly installed at the end of firing. It should be noted that the retreating of the pair of heat treatment parts 20 (20a, 20b) from the end of firing is a pair of heat treatment parts 20 in a direction opposite to the moving direction of the heat treatment parts 20 (20a, 20b) subjected to the heat treatment. (20a, 20b) may be moved.

  By the way, in the prior art, when the pair of heating coils 21 (21a, 21b) move to adjacent positions, and the turning movement of the heating coils 21 (21a, 21b) is stopped, the first cooling is performed. Cooling is not sufficiently performed in the first cooling water discharge portion 23 (23a, 23b) at locations other than the peripheral surface portion of the workpiece W facing the location where the water discharge portion 23 (23a, 23b) is located. . Therefore, in the prior art, a separate cooling device is installed at the end of firing, and cooling water is discharged toward the center of the end of firing. However, in such a cooling method, there is a portion where sufficient cooling cannot be performed at a boundary portion between the cooling portion by the first cooling water discharge portion 23 (23a, 23b) and the cooling portion by the separate cooling device. In some places, a temperature rising portion is generated again due to heat conduction from the inside of the workpiece W, annealing occurs, and it may be difficult to obtain the workpiece W having desired properties.

  Therefore, in the heat treatment apparatus 100 according to the present embodiment, the cooling of the peripheral surface of the work W heated by the heating coil 21 (21a, 21b) is cooled by the second cooling water discharge unit 25 (25a, 25b). By carrying out including water, it became possible to maintain a high cooling effect at the end of firing. That is, in the present embodiment, it is possible to effectively prevent a second temperature increase due to heat conduction from the inside of the workpiece W by installing the second cooling water discharge portion 25 (25a, 25b). .

  Further, when the end of firing is approached, the moving speed of the pair of heat treatment parts 20 (20a, 20b) is reduced, and the work W heated by the heating coils 21 (21a, 21b) is transferred to the first cooling water discharge part 23. (23a, 23b), the second cooling water discharge section 25 (25a, 25b) and the cooling device 26 are used to cool the entire region from the start to the end of the firing. It became possible to prevent cracking. Here, since the cracking occurs due to thermal expansion when the workpiece W is quenched, the workpiece W is sequentially quenched from the start to the end of quenching as in the present embodiment. Thus, it is possible to suitably prevent the work W from being cracked.

  Therefore, according to the heat treatment apparatus 100 according to the present embodiment, the heat treatment is performed over the entire circumference of the peripheral surface of the work W, and an annular work W in which a uniform hardened layer is formed over the entire circumference is obtained. Will be able to.

  With respect to the position where the moving speed of the pair of heat treatment parts 20 (20a, 20b) is reduced, for example, the pair of heat treatment parts 20 (20a, 20b) is moved 172 ° around the center of the workpiece W as the rotation axis. be able to. That is, in the heat treatment apparatus 100 according to this embodiment, it is preferable to set a range of 8 ° + 8 ° = 16 ° in the vicinity of the end of firing to a heating region by the heat treatment processing unit 20 (20a, 20b) while decelerating. It has become.

  However, the scope of the present invention is not limited to these, and any conditions may be used as long as quenching is performed sequentially from the start of firing to the end of firing and a workpiece W having desired properties is obtained. It can be appropriately adjusted depending on the heating / cooling conditions, the composition of the workpiece W, and the like.

  The basic operation example of the heat treatment apparatus 100 according to the present embodiment has been described above. Next, an overall configuration example of the heat treatment apparatus 100 according to the present embodiment will be described with reference to FIGS. Here, FIG. 4 is a diagram illustrating an overall configuration example of the heat treatment apparatus 100 according to the present embodiment, and FIG. 5 is a schematic diagram for explaining a table of the heat treatment apparatus according to the present embodiment. The middle part (a) is a plan view of the table of the heat treatment apparatus according to the present embodiment, and the part (b) in the figure is a side view of the table of the heat treatment apparatus according to the present embodiment. And FIG. 6 is the schematic for demonstrating the heating coil of the heat processing apparatus which concerns on this embodiment.

  As shown in FIG. 4, the heat treatment apparatus 100 according to the present embodiment includes a base 13 serving as a base such as a table 11, a rotating unit 15 for rotating the table 11, and a table 11 placed on the rotating unit 15. And a pair of swivel arms 30 capable of swiveling relative to the table 11 and a pair of heat treatment parts 20 respectively installed on the pair of swivel arms 30.

  The base 13 is the basis of the heat treatment apparatus 100 according to the present embodiment. The rotating unit 15 is installed on the base 13.

  As shown in FIG. 4B and FIG. 5B, the rotating portion 15 is provided upright inside the fixed casing 16 via a bearing 14. The rotating part 15 is rotatable by transmission from the motor 12 by being gear-connected to the motor 12. 4 and 5, the table 11 is fixedly installed above the rotating unit 15, and the rotation center axis of the rotating unit 15 coincides with the center of the table 11. It is in a state. Therefore, when the rotating unit 15 is rotated by the transmission from the motor 12, the table 11 installed above the rotating unit 15 rotates. A bearing 34 is installed on the outer peripheral side of the fixed casing 16, and a lower arm 33 of a swing arm 30 described later is connected via the bearing 34.

  As shown in FIG. 5A, the table 11 has a substantially circular shape in plan view, and a clamp mechanism 19 for mounting the workpiece W is installed on the table 11. The workpiece W can be attached to the table 11.

  The clamp mechanism 19 is configured to be able to expand and contract according to the diameter of the annular workpiece W or the like. Then, as shown in FIG. 5A, for example, the workpiece Wmin or the workpiece max corresponding to the workpiece Wmax having a minimum diameter of 1500 mm to a workpiece Wmax having a maximum diameter of 3100 mm is placed on the table 11 and fixed. In addition, heat treatment can be performed.

  In order to place the workpiece W on the table 11 and fix it by the clamp mechanism 19, an electric crane 17 can be used. The crane 17 according to the present embodiment is configured to be hooked on an I-shaped steel. Here, the crane 17 should just be what can move the workpiece | work W to a horizontal direction and a perpendicular direction.

  The revolving arm 30 is capable of revolving relative to the table 11, and can be rotated by transmission from the motor 35 by being connected to the motor 35 via a timing belt or the like. On the lower arm 33 constituting the lower side of the swivel arm 30, the heat treatment processing unit 20 is installed via a transformer 41 or the like. When the turning arm 30 is turned relative to the table 11 by the transmission from the motor 35, the heat treatment processing unit 20 installed on the lower arm 33 included in the turning arm 30 is also turned. Therefore, the swivel arm 30 allows the heat treatment portion 20 to move along the circumferential surface of the annular workpiece W, so that the heat treatment can be performed on the circumferential surface of the workpiece W. It has become.

  As shown in FIG. 4, the swivel arm 30 includes an upper arm 31 that constitutes the upper side of the swivel arm 30, a vertical arm 32 that is disposed so as to be substantially perpendicular to the upper arm 31, and a lower arm 33. It has a substantially U-shape when viewed from the side.

  As shown in FIG. 4, the lower arm 33 is connected to the fixed casing 16 through a bearing 34 so as to be able to turn. The revolving arm 30 including the lower arm 33 can rotate separately from the rotating unit 15 (that is, the table 11). That is, even if the rotating part 15 is rotating, the turning arm 30 including the lower arm 33 can be stopped. Moreover, even if the rotation part 15 is not rotating, the turning arm 30 including the lower arm 33 can be rotated. In the heat treatment apparatus 100 according to the present embodiment, the rotating unit 15 (that is, the table 11) is rotated by transmission from the motor 12, and the turning arm 30 including the lower arm 33 is rotated by transmission from the motor 35. It is the composition to do.

  The lower arm 33 can be configured by incorporating a spline shaft as a track member of the motion guide device on the upper surface thereof. On the other hand, the transformer support 43 described later can be configured by incorporating a spline nut as a moving member of the motion guide device. With such a configuration, the transformer support 43, the transformer 41, and the heat treatment processing unit 20 installed in connection with the transformer 41 can be moved in the diameter direction with respect to the annular workpiece W, and have various diameters. The annular workpiece W can be quenched.

  As shown in FIG. 4, a transformer 41 that adjusts the current of the heating coil 21 included in the heat treatment processing unit 20 is installed on the lower arm 33 via a transformer support unit 43 that supports the transformer 41.

  The transformer 41 is for adjusting the current flowing through the heating coil 21. The transformer 41 according to this embodiment has a thin outer shape with a small lateral width. With this configuration, the distance between the pair of turning arms 30 can be reduced.

  As shown in FIGS. 4 and 6, the transformer 41 is provided with a heating coil attachment portion 27 for allowing the heating coil 21 to be attached or detached.

  The heating coil 21 according to the present embodiment is configured to be attachable to and detachable from the heating coil attachment portion 27. Therefore, it is possible to heat-treat all parts of the workpiece W, such as the outer peripheral side and the inner peripheral side of the annular workpiece W, by simply replacing the heating coil 21, and to perform the heat-treatment processing of the workpiece W having various shapes. Can be done.

  For example, in order to heat the workpiece W having a substantially trapezoidal shape in cross-section, it is preferable to use a heating coil 21c having a shape along the trapezoidal shape as shown in the partial diagram (a) of FIG. is there. Further, in order to heat the substantially rectangular workpiece W having a substantially U-shaped notch in sectional view, the sectional view of the notch in the workpiece W is omitted as shown in a partial view (b) of FIG. It is preferable to use a heating coil 21d in which a portion close to the workpiece W is formed in a triangular shape in a cross-sectional view so as to correspond to the letter-shaped shape.

  As described above, the heating coil 21 is provided with the first cooling water discharge portion 23, and the second cooling water discharge portion 25 is formed and installed at a position overlapping the heating coil 21.

  The heat treatment apparatus described with reference to FIGS. 2 and 3 can be realized by the heat treatment apparatus 100 having the specific apparatus configuration described above.

  The workpiece W that has been heat-treated by the heat treatment apparatus 100 according to the present embodiment is used, for example, as an outer ring or an inner ring of a slewing bearing. The slewing bearing will be described with reference to FIGS. 7 and 8. Here, FIG. 7 is a perspective view including a partial cross section of the slewing bearing, and FIG. 8 is a sectional view of the slewing bearing.

  7 and 8 show a slewing bearing incorporating a slewing bearing spacer. V-shaped rolling surfaces 55a and 56a are formed on the outer ring 55 and the inner ring 56, respectively, and the rolling surfaces 55a and 56a are formed. A roller rolling path 57 having a substantially square cross section, for example, a substantially square shape, is formed between the two. A plurality of rollers 58a, 58b,... Are arranged and stored in the roller rolling path with their inclination directions being alternately intersected. 7, a slewing bearing spacer 59 (hereinafter referred to as a spacer) indicated by diagonal lines is interposed between the plurality of rollers 58a, 58b, and holds the rollers 58a, 58b in a predetermined posture.

  The outer ring 55 is formed with a V-shaped rolling surface 55a on the inner periphery thereof. The opening angle of the V shape is set to approximately 90 degrees. The outer ring 55 is composed of a pair of annular workpieces W and is divided into two in the vertical direction for filling the rollers 58 and spacers 59. The outer ring 55 is formed with an oil supply hole 75 extending from the outer periphery to the outer ring rolling surface 55a at one place in the circumferential direction.

  The inner ring 56 is fitted on the inner peripheral side of the outer ring 55 so that the outer diameter is substantially matched with the inner diameter of the outer ring 55. An inner ring rolling surface 56a is formed on the outer periphery of the inner ring 56 so as to face the outer ring rolling surface 55a. The inner ring rolling surface 56a is also V-shaped, and the opening angle is set to approximately 90 degrees. The outer ring rolling surface 55a and the inner ring rolling surface 56a constitute a roller rolling path 57 having a substantially square cross section.

  In the roller rolling path 57, the rollers 58a, 58b,... The height of the rollers 58a, 58b,... Is set slightly smaller than their outer diameter. The rollers 58 a, 58 b... Adjacent to the left and right of the spacer 59 are classified into an outward roller 58 a and an inward roller 58 b with their axes orthogonal to each other. The outward roller 58 a is held by the spacer 59 so that its axis 60 faces the turning center point P <b> 1 located on the rotation center line P of the outer ring 55 and the inner ring 56. The inward roller 58b is also held by the spacer 59 in such a posture that its axis 61 faces the turning center point P2 located on the rotation center line P. Therefore, the axes of the rollers 58a, 58b,... Always keep a right angle with respect to the roller rolling path 57, and the rollers 58a, 58b,.

  In this way, the roller rolling path 57 can be formed by the outer ring rolling surface 55a and the inner ring rolling surface 56a by combining the workpieces W heat-treated by the heat treatment apparatus 100 according to the present embodiment. A plurality of rollers are arranged and stored in the roller rolling path, and spacers are disposed between the plurality of rollers. And a roller will roll in the roller rolling path. An annular workpiece W having a substantially trapezoidal shape in cross section, which has been heat-treated by the heat treatment apparatus 100 according to the present embodiment, is arranged vertically. And this inner ring | wheel will be comprised from the substantially rectangular shaped workpiece | work W which has the notch of the cross-sectional view substantially letter-shaped shape heat-processed by the heat processing apparatus 100 which concerns on this embodiment.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, the heat treatment apparatus 100 according to the present embodiment is configured to include only one pair of the pair of heat treatment parts 20, but the heat treatment apparatus according to the present invention includes a plurality of pairs of the heat treatment parts 20. It is possible. That is, as shown in the partial diagram (a) of FIG. 9, when three pairs of heat treatment parts 20 are arranged, each heat treatment part 20 quenches approximately 1/6 of the annular workpiece W. can do. Further, as shown in the partial diagram (b) of FIG. 9, when four pairs of heat treatment parts 20 are arranged, each heat treatment part 20 quenches approximately 1/8 of the annular workpiece W. can do.

  Therefore, by installing a plurality of pairs of the heat treatment parts 20, the quenching time can be shortened compared to the case of using a pair of the heat treatment parts 20 and a heat treatment apparatus with high productivity can be realized. It becomes like this. Further, by arranging a plurality of sets of the pair of heat treatment parts 20, it is possible to prevent the distortion of the workpiece W from being accumulated and to reduce the distortion of the hardened workpiece W.

  Further, for example, in the heat treatment apparatus 100 according to the present embodiment, the heating coil 21 and the first cooling water discharge unit 23 are provided adjacent to each other in the moving direction of the heat treatment processing unit 20. The range is not limited to this. That is, in the direction of the normal use state of the heat treatment apparatus 100, for example, the first cooling water discharge part 23 may be installed on the heating coil 21 and provided side by side.

  For example, the heat treatment apparatus 100 according to the present embodiment can be applied not only to quenching but also to tempering and annealing. When tempering the workpiece W, for example, the workpiece W can be heated to an appropriate temperature by the heating coil 21 and then cooled by the first cooling water discharge portion 23 or the second cooling water discharge portion 25. Even when the workpiece W is annealed, for example, after heating to an appropriate temperature by the heating coil 21, it can be gradually cooled by the first cooling water discharge portion 23 or the second cooling water discharge portion 25. .

  Further, for example, in the above-described embodiment, the description has been made on the assumption that the heat treatment is performed by fixing the work W on the table 11 and turning the heat treatment portion 20 by the turning arm 30. The relative positional relationship between the workpiece W and the heat treatment portion 20 may be any as long as it can realize the basic operation example of the heat treatment apparatus described with reference to FIGS. 2 and 3, and the workpiece W on the table 11 is rotated. However, the heat treatment apparatus 100 may be operated so that the heat treatment portion 20 is swung by the swivel arm 30.

  Furthermore, in the heat treatment apparatus 100 according to the present embodiment, the example in which the heat treatment processing is performed on the constituent member of the slewing bearing as the work W has been described, but the present invention is not limited thereto, and is used for any annular work. be able to.

  In the heat treatment apparatus 100 according to the present embodiment, a motion guide device is installed on the lower arm 33 so that the swivel arm 30 including the lower arm 33 can be moved in the diameter direction with respect to the annular workpiece W. For example, a spline shaft as a track member of the motion guide device may be incorporated into the lower surface of the upper arm 31 and a spline nut as a movement member of the motion guide device may be incorporated into the vertical arm 32.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 100 Heat processing apparatus, 11 Table, 12, 35 Motor, 13 Base, 14, 34 Bearing, 15 Rotating part, 16 Fixed casing, 17 Crane, 19 Clamp mechanism, 20 Heat processing part, 21 Heating coil, 23 1st cooling water discharge | release Part, 25 second cooling water discharge part, 26 cooling device, 27 heating coil attachment part, 30 swing arm, 31 upper arm, 32 vertical arm, 33 lower arm, 41 transformer, 43 transformer support part, 55 outer ring, 55a outside Rolling surface, 56 Inner ring, 56a Inner ring rolling surface, 57 Roller rolling path, 58a Outward roller (roller), 58b Inward roller (roller), 59 Swivel bearing spacer, 60, 61 Axis, 75 Lubrication hole, P Rotation center line, P1, P2 Turning center line, W Workpiece.

Claims (4)

A table on which an annular workpiece can be placed;
A pair of heat treatment parts for heat treating the peripheral surface of the workpiece;
With
In the heat treatment apparatus used for obtaining a workpiece having a desired property by performing a heat treatment on the workpiece while moving the pair of heat treatment portions in opposite directions along the peripheral surface of the workpiece,
The heat treatment part is
A heating coil that can be disposed opposite to the peripheral surface of the workpiece;
A first cooling water discharge part for discharging cooling water, which is attached to the heating coil;
A second cooling water discharge part which is installed at a position overlapping with the heating coil and discharges cooling water;
By providing
When the pair of heat treatment parts move in directions opposite to each other along the peripheral surface of the workpiece, the peripheral surface of the workpiece heated by the heating coil is cooled by the cooling water discharged from the first cooling water discharge unit. Cool sequentially,
When the pair of heat treatment parts move to adjacent positions, cooling of the peripheral surface of the workpiece heated by the heating coil is performed including the cooling water discharged from the second cooling water discharge part. In the heat treatment apparatus, heat treatment is performed over the entire circumference of the peripheral surface of the workpiece. The heat treatment apparatus according to claim 1,
The pair of heat treatment parts are respectively installed on a pair of swivel arms that can swivel relative to the table. In the heat treatment apparatus according to claim 1 or 2,
A heat treatment apparatus comprising a plurality of sets of the pair of heat treatment parts. A table on which an annular workpiece can be placed;
A pair of heat treatment parts for heat treating the peripheral surface of the workpiece;
A heating coil that can be disposed opposite to the peripheral surface of the workpiece;
A first cooling water discharge part for discharging cooling water, which is attached to the heating coil;
A second cooling water discharge part which is installed at a position overlapping with the heating coil and discharges cooling water;
Using a heat treatment apparatus comprising
In the heat treatment method for obtaining a workpiece having a desired property by performing a heat treatment on the workpiece while the pair of heat treatment portions move in opposite directions along the peripheral surface of the workpiece,
When the pair of heat treatment parts move in directions opposite to each other along the peripheral surface of the workpiece, the peripheral surface of the workpiece heated by the heating coil is cooled by the cooling water discharged from the first cooling water discharge unit. Cool sequentially,
When the pair of heat treatment parts move to adjacent positions, cooling of the peripheral surface of the workpiece heated by the heating coil is performed including cooling water discharged from the second cooling water discharge part, A heat treatment method comprising performing heat treatment over the entire circumference of the peripheral surface of the workpiece.

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