JP2015172219A - Heat-treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-treatment apparatus that can stably carry out a uniform heat-treatment processing over the entire circumference of a peripheral surface of an annular workpiece.SOLUTION: A heat-treatment apparatus 100 in which paired heat-treatment processing parts 20 for heat-treatment-processing the peripheral surface of an annular workpiece W apply heat-treatment processing to the workpiece W while moving in opposite directions to each other over the peripheral surface of the annular workpiece W, is used to manufacture a workpiece W having a desired quality. The heat-treatment apparatus 100 is configured so that the paired heat-treatment-processing parts 20 are installed in paired turning arms 30, respectively, that can be moved reciprocally with respect to a table 11 where the workpiece W can be placed, and the turning arms 30 include lower-side arms 33 where the heat-treatment-processing parts 20 are mounted, respectively, vertical arms 32 installed approximately vertically on the lower-side arms 33, respectively, and upper-side arms 31 installed on the vertical arms 32, respectively, and a turning center of the paired upper-side arms 31 coincides with a turning center of the paired lower-side arms 33.

Description

  The present invention relates to a heat treatment apparatus 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

  In the induction hardening method described in Patent Document 1 described above, a mechanism for moving the high frequency inductor along the outer periphery of the ring work is omitted. However, in order to obtain an annular member in which a uniform hardened layer is formed, it is necessary to stably move the heating coil along the circumferential surface of the annular member.

  Here, the conventional heat treatment apparatus 200 includes a table 11 on which an annular workpiece W can be placed and a pair for heat treating the peripheral surface of the workpiece W, as shown in a partial diagram (b) of FIG. And a pair of swivel arms 30 that can move relative to the table 11.

  The table 11 is a table on which the workpiece W can be placed. The workpiece W can be placed on the table 11 by the electric crane 17 and fixed, so that the heat treatment can be performed. The table 11 can be rotated about the center of the table 11 as a rotation center axis by a rotating unit 15 installed on a base 13 serving as a base of the table 11 or the like.

  As shown in FIG. 7B, the rotating unit 15 is connected to the motor 12 via a gear that transmits rotational driving from the motor 12. A fixed casing 16 is installed around the rotating portion 15 via a bearing 14. The fixed casing 16 is fixed to the base 13 serving as a foundation.

  A table 11 is installed on the rotating unit 15, and the table 11 is fixedly installed so that the rotating unit 15 and the rotation center coincide with each other. The rotational driving force from the motor 12 is transmitted by the gear, and the rotating unit 15 rotates. And the table 11 fixedly installed in the rotation part 15 will also rotate when the rotation part 15 rotates.

  A clamp mechanism 19 for attaching the workpiece W is installed on the table 11, and the workpiece W can be attached on the table 11 by the clamp mechanism 19.

  Further, the conventional heat treatment apparatus 200 includes a pair of heat treatment parts 20 for heat-treating the peripheral surface of the workpiece W. Each of the pair of heat treatment units 20 includes a heating coil 21 for heating the workpiece W, a cooling water discharge unit for cooling the workpiece W, and a cooling device (not shown). The conventional heat treatment apparatus 200 can heat and cool the workpiece W by the heating coil 21, the cooling water discharge unit, and a cooling device (not shown), and can perform a heat treatment process such as quenching on the workpiece W, for example. It is like that. The pair of heat treatment parts 20 are respectively installed on a pair of turning arms 30 that can turn relative to the table 11.

  As shown in FIG. 7B, the swivel arm 30 includes an upper arm 31 that constitutes the upper side of the swivel arm 30, a lower arm 33 that constitutes the lower side of the swivel arm 30, and a lower arm 33. It is composed of a vertical arm 32 installed on the top, and has a substantially U-shaped appearance in a side view. 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. And the heat processing part 20 is installed on the lower arm 33 of the turning arm 30 via the transformer 41 etc. which are mentioned later. When the turning arm 30 turns relative to the table 11, the heat treatment processing unit 20 installed on the lower arm 33 included in the turning arm 30 also turns.

  However, in the conventional heat treatment apparatus 200, the crane 17 rotates the table 11 and the pair of heat treatment parts 20 in order to place the workpiece W on the table 11, as shown in the partial diagram (a) of FIG. Since it is arranged on the extension line of the central shaft, the turning center of the upper arm 31 and the turning center of the lower arm 33 do not coincide with each other. For this reason, as shown in FIG. 8, in the conventional heat treatment apparatus 200, the upper arm 31 included in the turning arm 30 on the right side of the paper turns around the turning center R, and the upper arm 31 included in the turning arm 30 on the left side of the paper. Is turned around the turning center L, and the heating coil 21 installed on the lower arm 33 is turned around the turning center C.

  As described above, in the conventional heat treatment apparatus 200, the turning center of the upper arm 31 and the turning center of the lower arm 33 in the turning arm 30 do not coincide with each other, so that the heating coil 21 is moved along the peripheral surface of the workpiece W. There is a problem that it is difficult to move stably, it is difficult to obtain a workpiece W having a desired quenching quality, and there is a problem that it is difficult to increase the turning speed of the heat treatment part 20 including the heating coil 21. It was. In order to stably move the heating coil 21 along the peripheral surface of the workpiece W, a heat treatment apparatus is required in which the holding member (the turning arm 30) that holds the heat treatment apparatus 20 including the heating coil 21 has high rigidity. It was.

  The present invention has been made in view of the problems existing in the above-described prior art, and an object thereof is a heat treatment apparatus capable of stably performing uniform heat treatment 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 desired properties by performing heat treatment on the workpiece while moving in opposite directions along the peripheral surface of the pair of heat treatment portions, The swivel arms are respectively installed on a pair of swivel arms capable of swivel movement relative to the table, and the swivel arms are installed substantially vertically on the lower arm on which the heat treatment part is placed and on the lower arm. A vertical arm and an upper arm installed on the vertical arm, wherein the pivot center of the pair of upper arms coincides with the pivot center of the pair of lower arms. It is.

  According to the present invention, it is possible to provide a heat treatment apparatus for stably performing uniform heat treatment over the entire circumference of an annular workpiece.

It is a figure which shows the example of a whole structure of the heat processing apparatus which concerns on this embodiment. It is a figure 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, and the fractional figure (b) in a figure ) Is a side view of the heat treatment apparatus according to the present embodiment. It is a planar view schematic diagram for demonstrating the structural example and operation example of the turning arm which concern 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, and the fractional diagram (a) in a figure is the schematic which shows the state of the position (quenching start) which starts hardening, The partial diagram (b) is a schematic diagram showing a state between the start of quenching and the position where the quenching is finished (end of quenching), and the fractional diagram (c) and the partial diagram (d) in FIG. FIG. It is a perspective view containing the partial cross section of a slewing bearing. It is sectional drawing of a slewing bearing. It is a figure which shows the structure of the conventional heat processing apparatus, The part figure (a) in a figure is a top view of the upper arm which concerns on the conventional heat processing apparatus, The part figure (b) in a figure is the conventional heat processing apparatus. FIG. It is a planar view schematic diagram for demonstrating the operation example of the conventional heat processing apparatus.

  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, an overall configuration example of the heat treatment apparatus 100 according to the present embodiment will be described with reference to FIGS. Here, FIG. 1 is a diagram showing an overall configuration example of the heat treatment apparatus according to the present embodiment. Moreover, FIG. 2 is a figure 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, FIG. The middle part (b) is a side view of the heat treatment apparatus according to the present embodiment. FIG. 3 is a schematic plan view for explaining a configuration example and an operation example of the swivel arm according to the present embodiment. FIG. 4 is a schematic diagram illustrating a basic operation example of the heat treatment apparatus according to the present embodiment, and a partial diagram (a) in the diagram is a schematic diagram illustrating a state of a position where quenching starts (start of quenching). The partial diagram (b) in the figure is a schematic diagram showing the state between the start of quenching and the position at which quenching is completed (end of quenching), and the partial diagram (c) and partial diagram (d) in the figure are diagrams It is the schematic which shows the state of the end.

  As shown in FIGS. 1, 2, and 4, 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 treatments for heat treating the peripheral surface of the workpiece W. And a processing unit 20 (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. And heat processing will be performed with respect to the surrounding surface used as the rolling-element rolling surface of a slewing bearing in the workpiece | work W, for example.

  The table 11 can place a workpiece W, and the table 11 according to the present embodiment has a substantially circular shape in plan view as shown in a partial diagram (a) of FIG. In the heat treatment apparatus 100 according to the present embodiment, for example, the work W is placed on the table 11 by a cargo handling truck such as a forklift, and the heat treatment is performed by fixing the work W by a clamp mechanism 19 described later. It is possible to be in a state that can be.

  The table 11 can be rotated about the center of the table 11 by a rotation unit 15 installed on the base 13 serving as a base.

  As shown in FIG. 1, the rotating unit 15 is connected to the motor 12 via a gear that transmits rotational driving from the motor 12. A fixed casing 16 is installed around the rotating portion 15 via a bearing 14. The fixed casing 16 is fixed and installed with respect to the base 13 serving as a foundation.

  As shown in FIGS. 1 and 2, the table 11 is fixed on the rotating portion 15, and the table 11 is fixedly installed so that the rotating portion 15 and the rotation center coincide with each other.

  The rotational driving force from the motor 12 is transmitted by the gear, and the rotating unit 15 rotates. And the table 11 fixedly installed in the rotation part 15 will also rotate when the rotation part 15 rotates.

  On the table 11, a clamp mechanism 19 for mounting the workpiece W is installed, and the workpiece W can be mounted on the table 11 by the clamp mechanism 19.

  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. As shown in the partial diagram (a) of FIG. 2, the heat treatment apparatus 100 according to the present embodiment corresponds to, for example, a workpiece Wmin having a minimum diameter of 1500 mm to a workpiece Wmax having a maximum diameter of 3100 mm. It is possible to heat-treat the peripheral surface of the workpiece Wmin or the workpiece max.

  With the above configuration, the workpiece W on the table 11 fixed by the clamp mechanism 19 can rotate about the center of the table 11 (that is, the center of the workpiece W) as a rotation center axis (however, In the present embodiment, the table 11 is not rotated when the heat treatment is performed, but is fixed.

  As shown in FIG. 4, the heat treatment apparatus 100 according to this embodiment includes a pair of heat treatment parts 20 (20a, 20b) for heat-treating the peripheral surface of the workpiece W.

  As shown in FIG. 4, the pair of heat treatment parts 20 (20 a, 20 b) includes a heating coil 21 (21 a, 21 b) for heating the work W and a cooling water discharge part 23 for cooling the work W, respectively. (23a, 23b).

  The heating coil 21 is configured to be disposed so as to face the peripheral surface of the workpiece W, and can heat the peripheral surface of the workpiece W. In FIG. 1 and FIG. 2, the shape of the heating coil 21 is formed such that the tip thereof has a substantially triangular shape in sectional view. The heating coil 21 having such a shape can heat, for example, a substantially rectangular workpiece W having a substantially U-shaped notch in cross section.

  The heating coil 21 is configured to be attachable to and detachable from the heating coil attachment portion 27 for attaching the heating coil 21. Therefore, according to the heat treatment apparatus 100 according to the present embodiment, 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 variously. It is possible to perform the heat treatment of the workpiece W having the shape.

  The cooling water discharge portion 23 is for cooling the workpiece W. The cooling water discharge portion 23 is provided, for example, along with the heating coil 21, and a plurality of holes for discharging the cooling water are formed on the side surface or the surface facing the workpiece W so that the cooling water can be discharged. Can be configured.

  Furthermore, in the heat treatment apparatus 100 according to the present embodiment, the table 11 in which the cooling device 26 for cooling the workpiece W after the heat treatment processing unit 20 is retracted from the burning end portion of the workpiece W becomes the burning end portion of the workpiece W. It is fixedly installed on top (see FIG. 4). 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.

  In the heat treatment apparatus 100 according to the present embodiment, the temperature of the workpiece W is raised and cooled by the heating coil 21 and the cooling water discharge unit 23, and then the cooling is further performed by the cooling apparatus 26, for example, heat treatment such as quenching. Processing can be performed on the workpiece W.

  As shown in FIG. 1, the heat treatment processing unit 20 is configured to be held by a turning arm 30 that can turn relative to the table 11.

  The swivel arm 30 includes an upper arm 31, a vertical arm 32, and a lower arm 33. As shown in FIG. 1, the appearance of the swivel arm 30 is substantially U-shaped in a side view. Then, as shown in FIG. 3, the pair of turning arms 30 are installed so that the turning centers coincide with each other. 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.

  The lower arm 33 constitutes the lower side of the swivel arm 30, and as shown in FIG. 1, the heat treatment part 20 is placed on the lower arm 33 via a transformer 41 and the like which will be described later. In addition, a spline shaft as a track member of the motion guide device can be incorporated 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.

  The lower arm 33 is installed in a rotatable state on the fixed casing 16 via a bearing 34 as shown in a partial diagram (b) of FIGS. 1 and 2. The swivel arm 30 including the lower arm 33 can be rotated 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.

  A transformer support 43 is installed above the lower arm 33. The transformer support portion 43 is for supporting the transformer 41.

  Electric power is supplied from a power source (not shown) to the transformer 41 installed on the transformer support 43. As shown in FIGS. 1 and 2, the heating coil 21 is installed in the transformer 41 via the heating coil mounting portion 27. The transformer 41 can adjust the current flowing through the heating coil 21.

  As shown in FIG. 1, the vertical arm 32 is installed substantially vertically on the lower arm 33 and is configured to connect the upper arm 31 and the lower arm 33.

  An upper arm 31 is installed on the vertical arm 32. The upper arm 31 constitutes the upper side of the turning arm 30. Unlike the conventional heat treatment apparatus 200 described above, the heat treatment apparatus 100 according to the present embodiment does not install the crane 17 and places the workpiece W on the table 11 using a cargo handling truck such as a forklift. The upper arm 31 can be installed so that the turning center C ′ of the pair of upper arms 31 coincides with the turning center C ′ of the pair of lower arms 33 (see FIG. 3). Furthermore, in the heat treatment apparatus 100 according to the present embodiment, the turning center of the upper arm 31 is arranged on the extension line of the central axis of the rotation center of the table 11, so that the turning center C ′ of the turning arm 30 and the table 11 The configuration coincides with the turning center C ′.

  Further, as described above, in the conventional heat treatment apparatus 200, as shown in FIG. 8, the turning centers L and R of the upper arm 31 on the left side and the right side of the drawing and the turning center C of the lower arm 33 are different. It was difficult to stably move the heating coil 21 along the peripheral surface of the workpiece W, and it was difficult to obtain the workpiece W having a desired quenching quality. That is, when the pair of heat treatment parts 20 installed on the lower arm 33 performs heat treatment on the workpiece W while moving in the opposite directions along the circumferential surface of the workpiece W, There is a problem that it is difficult to make the angle and distance with the peripheral surface of the workpiece W facing the heating coil 21 constant, and it is difficult to obtain the workpiece W having a desired quenching quality. Further, when the turning speed of the lower arm 33 on which the heat treatment part 20 including the heating coil 21 is installed is increased, the balance between the upper arm 31 and the lower arm 33 is poor. There was a problem that it was difficult to increase the speed.

  In contrast, in the heat treatment apparatus 100 according to the present embodiment, the turning center C ′ of the upper arm 31 and the turning center C ′ of the lower arm 33 coincide with each other, and further, the turning center C ′ of the turning arm 30. And the turning center C ′ of the table 11 coincide with each other, so that the turning arm 30 can be stably turned. Therefore, according to the heat treatment apparatus 100 according to the present embodiment, it is possible to realize the heat treatment apparatus 100 that can stably obtain the workpiece W having uniform quenching quality. Moreover, since the heat processing part 20 which concerns on this embodiment is hold | maintained by the highly rigid turning arm 30 as mentioned above, even if it raises the turning speed of the heat processing part 20 containing the heating coil 21, a heating coil The vibration of the heat treatment processed part 20 including 21 can be prevented. Therefore, according to the heat treatment apparatus 100 according to the present embodiment, the quenching speed of the peripheral surface of the workpiece W by the heat treatment processing unit 20 can be increased, leading to improvement in productivity.

  The overall configuration of the heat treatment apparatus 100 according to the present embodiment has been described above. Next, an operation example of the heat treatment apparatus 100 according to the present embodiment will be described with reference to FIGS. 3 and 4.

  In the heat treatment apparatus 100 according to the present embodiment, when heat treatment is started, for example, as shown in a partial diagram (a) of FIG. 4, a pair of heat treatment parts 20 (20a, 20b) are arranged adjacent to each other. Can be done. As described above, the pair of heat treatment parts 20 (20a, 20b) is configured to be installed on the pair of turning arms 30 (30a, 30b) and held by the turning arms 30 (30a, 30b). The

  As shown in the partial diagram (a) of FIG. 4, the heat treatment processing unit 20 a on the left side of the paper moves to the heat treatment processing unit 20 a while moving in the upper left direction along the peripheral surface of the workpiece W by the swiveling movement of the swivel arm 30 a. The included heating coil 21a heats the workpiece W. And the workpiece | work W heated by the heating coil 21a will be sequentially cooled by the cooling water discharge | release part 23a. More specifically, when the swivel arm 30a pivots in the upper left direction on the paper surface, the heat treatment processing unit 20a installed on the swivel arm 30a also pivots in the upper left direction on the paper surface, and the periphery of the workpiece W on the surface facing the heat treatment processing unit 20a. The surface is heated by the heating coil 21a, and then the workpiece W is cooled and the heat treatment (quenching) is performed by the cooling water discharge unit 23a discharging the cooling water to the heated workpiece W. Become.

  On the other hand, similarly to the heat treatment part 20a on the left side of the drawing, as shown in the partial diagram (a) of FIG. 4, the heat treatment part 20b on the right side of the drawing is moved along the peripheral surface of the workpiece W by the turning movement of the turning arm 30b. While moving in the upper right direction of the paper, the heating coil 21b included in the heat treatment processing unit 20b heats the workpiece W, and the heated workpiece W is sequentially cooled by the cooling water discharge unit 23b. More specifically, when the swivel arm 30b pivots in the upper left direction of the paper, the heat treatment part 20b installed on the swivel arm 30b also pivots in the upper right direction of the paper, while the heating coil 21b faces the heat treatment part 20b. By heating the peripheral surface of the workpiece W and then the cooling water discharge part 23b discharging the cooling water to the heated workpiece W, the workpiece W is cooled and heat treatment processing (quenching) is performed. Become.

  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. In the heat treatment apparatus 100 according to the present embodiment, since the pair of heat treatment parts 20 (20a, 20b) are held by the pair of turning arms 30 (30a, 30b), according to the heat treatment apparatus 100 according to the present embodiment. The angle and distance between the pair of heating coils 21 (21a, 21b) and the peripheral surface of the workpiece W facing the heating coils 21 (21a, 21b), which enables a stable swivel movement of the pair of heat treatment parts 20 Can be held, and the workpiece W having uniform quenching quality can be stably obtained. In addition, even if the rotational speed of the pair of heat treatment parts 20 (20a, 20b) including the pair of heating coils 21 (21a, 21b) is increased, the pair of heat treatment parts 20 (20a, 20b) is rigid. Since it is held by the pair of high turning arms 30 (30a, 30b), vibration of the pair of heat treatment parts 20 (20a, 20b) can be prevented. Therefore, the heat treatment apparatus 100 according to the present embodiment can increase the quenching speed of the peripheral surface of the workpiece W by the pair of heat treatment parts 20 (20a, 20b), and can improve productivity.

  As shown in the partial diagram (b) of FIG. 4, the pair of heat treatment parts 20 (20a, 20b) and the pair of swivel arms 30 (30a, 30b) move to a position approximately halfway between the start and end of firing. When this happens, almost half of the workpiece W has been heat-treated (quenched).

  In the heat treatment apparatus 100 shown in the partial diagram (b) of FIG. 4, the heat treatment processing unit 20a on the left side of the paper is swung in the upper right direction of the paper along the peripheral surface of the workpiece W by the swiveling movement of the swivel arm 30a. The peripheral surface of the workpiece W is heated by the heating coil 21a included in the heat treatment processing portion 20a, and the heated workpiece W is sequentially cooled by the cooling water discharged from the cooling water discharge portion 23a that turns and moves thereafter. It will be.

  Further, the heat treatment processing unit 20b on the right side of the drawing turns around the workpiece W by the heating coil 21b included in the heat treatment processing unit 20b while turning in the upper left direction of the drawing along the circumferential surface of the workpiece W by the turning movement of the turning arm 30b. The surface is heated, and the heated workpiece W is sequentially cooled by the cooling water discharged from the cooling water discharge portion 23b that turns and moves thereafter.

  By proceeding with the heat treatment as described above, the pair of heat treatment parts 20 (20a, 20b) installed on the pair of swivel arms 30 (30a, 30b) can be obtained as shown in a partial diagram (c) of FIG. , They move to positions adjacent to each other.

  And when a pair of heat processing part 20 (20a, 20b) approaches the end of baking, a pair of turning arm 30 (30a, 30b) will carry out turning movement, loosening a moving speed, and a pair of heat processing part 20 (20a). , 20b) also has a configuration in which the workpiece W at the end of firing can be heated by heat conduction while rotating while slowing the moving speed.

  After the workpiece W at the end of the quenching is heated by heat conduction, as shown in the partial diagram (d) of FIG. 4, the pair of heat treatment parts 20 (20a, 20b) are retracted from the locations where quenching is completed. The pair of revolving arms 30 (30a, 30b) is moved so as to cause the work W to be cooled by the cooling device 26. In this way, heat treatment (quenching) is performed over the entire circumference of the peripheral surface of the workpiece W. Note that the retreat from the end of the firing of the pair of heat treatment parts 20 (20a, 20b) is opposite to the moving direction of the heat treatment parts 20 (20a, 20b) that have undergone the heat treatment. What is necessary is just to move a pair of heat processing part 20 (20a, 20b) by moving a pair of turning arm 30 (30a, 30b) in which 20 (20a, 20b) was installed.

  The operation example of the heat treatment apparatus 100 according to the present embodiment has been 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. 5 and 6. Here, FIG. 5 is a perspective view including a partial cross section of the slewing bearing, and FIG. 6 is a sectional view of the slewing bearing.

  FIGS. 5 and 6 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 these 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. 5, a slewing bearing spacer 59 (hereinafter referred to as a spacer) is interposed between the plurality of rollers 58a, 58b... And holds the rollers 58a, 58b.

  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.

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

  Furthermore, 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 cooling water discharge portion 23. Even when the workpiece W is annealed, for example, the workpiece W can be gradually cooled by the cooling water discharge portion 23 after being heated to an appropriate temperature by the heating coil 21.

  In the present embodiment, the work W is fixed on the table 11 and the heat treatment process is performed by turning the heat treatment part 20 by the swivel arm 30. The relative positional relationship with the heat treatment processing unit 20 is not particularly limited as long as the operation example of the heat treatment apparatus 100 described in FIG. 4 can be realized. For example, the heat treatment is performed by the swivel arm 30 while rotating the workpiece W on the table 11. You may operate the heat processing apparatus 100 so that the process part 20 may be swung.

  Further, the swivel arm 30 according to the present embodiment is configured so that the appearance is substantially U-shaped in a side view, but the shape of the swivel arm 30 is not limited to this, and the heat treatment processing unit 20 is stabilized. Any shape can be used as long as it can be held.

  Further, 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. However, the present invention is not limited to this 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.

  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. 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.

  100, 200 Heat treatment device, 11 Table, 12, 35 Motor, 13 Base, 14, 34 Bearing, 15 Rotating part, 16 Fixed casing, 17 Crane, 19 Clamp mechanism, 20 Heat treatment part, 21 Heating coil, 23 Cooling water discharge , 26 Cooling device, 27 Heating coil mounting part, 30 Rotating arm, 31 Upper arm, 32 Vertical arm, 33 Lower arm, 41 Transformer, 43 Transformer support part, 55 Outer ring, 55a Outer ring rolling surface, 56 Inner ring, 56a Inner ring rolling surface, 57 roller rolling path, 58a outward roller (roller), 58b inward roller (roller), 59 slewing bearing spacer, 60, 61 axis, 75 oiling hole, C, C ', L, R turning Center, P rotation center line, P1, P2 turning center line, W work.

Claims (3)

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 pair of heat treatment parts are respectively installed on a pair of swivel arms capable of swiveling relative to the table,
The swivel arm is
A lower arm on which the heat treatment part is placed;
A vertical arm installed substantially vertically on the lower arm;
An upper arm installed on the vertical arm;
With
The heat treatment apparatus characterized in that a turning center of the pair of upper arms coincides with a turning center of the pair of lower arms. The heat treatment apparatus according to claim 1,
A heat treatment apparatus, wherein a turning center of the pair of turning arms coincides with a turning center of the table. In the heat treatment apparatus according to claim 1 or 2,
The heat treatment apparatus, wherein the heat treatment portion is held by the swivel arm.

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