JP2015172220A - Heat-treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-treatment apparatus that can economically 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: includes a table 11 where an annular workpiece W can be placed, and an even number of heat-treatment processing parts 20 for heat-treatment processing the peripheral surface of the workpiece W, in which the even number of heat-treatment processing parts 20 apply heat-treatment processing to the workpiece W while moving in opposite directions to each other over the peripheral surface of the workpiece W; and is used to manufacture a workpiece W having a desired quality. The heat-treatment apparatus 100 is configured to include a heat-treatment processing parts moving mechanism 50 that can move the even number of heat-treatment processing parts 20 in such a way that a heat-treatment processing part 20 can cooperate with the adjacent heat-treatment processing parts 20 to uniformly heat-treatment process the peripheral surface of the workpiece W with no seams.

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 on which a uniform hardened layer is formed, a predetermined position of the heating coil is made to face the peripheral surface of the annular member, or the heating coil and the annular member facing the heating coil are arranged. It is necessary to move the heating coil along the circumferential surface of the annular member by setting the distance to the circumferential surface to be a predetermined distance. By making the positional relationship between the heating coil and the circumferential surface of the annular member constant over the entire circumference of the annular member, the temperature condition of the annular member can be made constant, and the temperature condition of the rapid cooling can be made constant. This is because the transformation from austenite to martensite can be caused uniformly.

  Conventionally, since the heating coil corresponding to the diameter of the annular member is produced and used for the annular member having various diameters, the capital investment is enormous and the annular member having a different diameter is heat-treated. Each time, the heating coil must be replaced, which is not economical.

  The present invention has been made in view of the existence of various problems existing in the above-described prior art, and an object of the present invention is to achieve seamless and uniform heat treatment over the entire circumference of the circumferential surface of various annular workpieces. An object of the present invention is to provide a heat treatment apparatus that can be carried out automatically.

  The heat treatment apparatus according to the present invention includes a table on which an annular work can be placed, and an even number of heat treatment parts for heat treating the peripheral surface of the work, wherein the even number of heat treatment parts are: 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 peripheral surface of the workpiece, wherein the heat treatment portions are adjacent to each other. A heat treatment processing portion moving mechanism that enables the even number of heat treatment processing portions to move so that the peripheral surface of the workpiece can be uniformly heat treated seamlessly in cooperation with the heat treatment processing portion; It is a feature.

  The heat treatment apparatus according to the present invention includes a table on which an annular work can be placed, and an even number of heat treatment parts for heat treating the peripheral surface of the work, and the even number of heat treatment parts. Is 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 peripheral surface of the workpiece, wherein the heat treatment portion is A heating coil for heating the circumferential surface of the workpiece, and further comprising a heating coil angle changing means for controlling the heating coil and the circumferential surface of the workpiece facing the heating coil to be positioned at a predetermined distance. It is a feature.

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

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 and heat processing part moving mechanism 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 table and the heat treatment processing part moving mechanism of the heat treatment apparatus according to the present embodiment. It is an enlarged view of the heat processing part moving mechanism 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, 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 the schematic which shows the heating coil and transformer of the conventional heat processing apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the circumferential direction movement mechanism which concerns on this embodiment, The division figure (a) in a figure is sectional drawing of the circumferential direction movement mechanism which concerns on this embodiment, The division figure (b) in a figure is It is a perspective view of the circumferential direction moving mechanism which concerns on this embodiment. It is the schematic for demonstrating the movement of the heating coil which concerns on this embodiment, and the trans | transformer of the circumferential direction. It is a figure which shows the structural example of the whole heat processing apparatus which concerns on a 2nd Example. It is the schematic for demonstrating the position and distance of the conventional heating coil and a workpiece | work. It is the schematic which illustrates one form of the heating coil angle change means which concerns on a 2nd Example. It is a perspective view containing the partial cross section of a slewing bearing. It is sectional drawing of a slewing bearing.

  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 embodiment]
First, the overall configuration of the heat treatment apparatus 100 according to the present embodiment will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is a diagram showing an overall configuration example of the heat treatment apparatus according to the present embodiment. FIG. 2 is a view for explaining the table of the heat treatment apparatus and the heat treatment processing unit moving mechanism according to the present embodiment, and the partial diagram (a) in the drawing shows the table of the heat treatment apparatus according to the present embodiment. FIG. 4B is a plan view, and FIG. 5B is a side view of the table and the heat treatment processing unit moving mechanism of the heat treatment apparatus according to the present embodiment.

  As shown in FIG. 1 and FIG. 2, the heat treatment apparatus 100 according to the present embodiment includes a table 11 on which an annular workpiece W can be placed, and two heat treatment portions for heat treating the peripheral surface of the workpiece W. 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 about this workpiece | work W, the heat processing can be performed with respect to the surrounding surface used as the rolling-element rolling surface of a slewing bearing, 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. Then, the work W can be placed on the table 11 by the electric crane 17 and fixed, so that the heat treatment can be performed. Although the crane 17 according to the present embodiment is configured to be hooked on the I-shaped steel, the crane 17 may be anything that can move the workpiece W in the horizontal direction and the vertical direction.

  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. 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 fixedly installed with respect to the base 13 serving as a foundation.

  As shown in FIGS. 1 and 2, the table 11 is fixedly installed on the rotating unit 15 such 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.

  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 includes, for example, a motion guide device, and the clamp mechanism 19 is configured to be able to expand and contract in accordance with 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 FIGS. 1 and 2, the heat treatment apparatus 100 according to the present embodiment includes two heat treatment parts 20 for heat-treating the peripheral surface of the workpiece W.

  And as shown in FIG. 4, the two heat processing part 20 (20a, 20b) each has the heating coil 21 (21a, 21b) for heating the workpiece | work W, and the cooling water for cooling the workpiece | work W The discharge part 23 (23a, 23b) is provided.

  The heating coil 21 is configured to be disposed so as to face the peripheral surface of the workpiece W. The heating coil 21 can heat the peripheral surface of the workpiece W. In FIG. 1 and FIG. 2, the tip of the heating coil 21 is formed in a 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 (see FIG. 8).

  The heating coil 21 can be attached to and detached from the heating coil attachment portion 27. 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 workpiece W is heated and cooled by the heating coil 21 and the cooling water discharge portion 23, and then further cooled by the cooling apparatus 26, for example, heat treatment such as quenching. It 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.

  As shown in FIG. 1, the swing arm 30 includes an upper arm 31 that configures the upper side of the swing arm 30, a lower arm 33 that configures the lower side of the swing arm 30, and an upper arm 31 and a lower arm 33. And a vertical arm 32 to be connected, and the appearance is substantially U-shaped 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.

  On the lower arm 33 of the swivel arm 30, the heat treatment processing unit 20 is installed via a transformer 41 described 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. Therefore, the swivel arm 30 allows the heat treatment portion 20 to move along the circumferential surface of the annular workpiece W, and heat treatment can be performed on the entire circumference of the circumferential surface of the workpiece W. It can be done.

  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 FIG. 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. As shown in FIG. 1, 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 revolving arm 30 including the lower arm 33. Is configured to rotate by transmission from the motor 35.

  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 FIG. 1 and FIG. 2, the heating coil 21 is installed in the transformer 41 via a heating coil attachment portion 27 for attaching the heating coil 21. The transformer 41 can adjust the current flowing through the heating coil 21.

  Further, as shown in FIG. 1, in the heat treatment apparatus 100 according to the present embodiment, the heat treatment part 20 cooperates with the adjacent heat treatment part 20 to uniformly heat treat the peripheral surface of the workpiece W seamlessly. The heat treatment processing unit moving mechanism 50 that enables the two heat treatment processing units 20 to move with respect to the swivel arm 30 is configured.

  The overall configuration of the heat treatment apparatus 100 according to the present embodiment has been described above. Next, the heat processing part moving mechanism 50 according to the present embodiment will be described with reference to FIGS. Here, FIG. 3 is an enlarged view of the heat treatment processing part moving mechanism according to the present embodiment. FIG. 4 is a schematic diagram showing a basic operation example of the heat treatment apparatus according to the present embodiment, and a schematic diagram (a) in the drawing shows a state of a position (quenching start) at which quenching is started. The partial diagram (b) in the figure is a schematic diagram showing the state between the start of quenching and the position where the quenching is finished (end of quenching), and the fractional diagram (c) and partial diagram (d) in the figure FIG. 2 is a schematic view showing a state after burning. FIG. 5 is a schematic view showing a heating coil and a transformer of a conventional heat treatment apparatus. FIG. 6 is a schematic view showing the circumferential movement mechanism according to this embodiment, and FIG. 6A is a sectional view of the circumferential movement mechanism according to this embodiment. Part (b) is a perspective view of the circumferential movement mechanism according to the present embodiment. Furthermore, FIG. 7 is a schematic diagram for explaining the circumferential movement of the heating coil and the transformer according to the present embodiment. In FIG. 5, swivel arms 30a ′ and 30b ′ indicated by solid lines are shown on the transformers 41a and 41b indicated by solid lines, and swivel arms 30a ″ and 30b indicated by broken lines are indicated on the transformers 41a and 41b indicated by broken lines. ”Is shown, but this is for convenience of explanation, and actually, a transformer 41 is installed above the swing arm 30.

  The heat treatment processing unit moving mechanism 50 is configured to move the heat treatment processing unit 20 so that the heat treatment processing unit 20 can be adjacent to the adjacent heat treatment processing unit 20 without a gap. The heat treatment processing unit moving mechanism 50 according to the present embodiment enables a radial direction movement mechanism 51 that allows the heat treatment processing unit 20 to move in the radial direction of the workpiece W, and allows the heat treatment processing unit 20 to move in the circumferential direction of the workpiece W. And a circumferential movement mechanism 52.

  As shown in FIG. 3, the radial direction moving mechanism 51 according to the present embodiment can use a motion guide device. For example, the track rail 45 as the track member of the linear guide and the movement as the move member of the linear guide. Block 47. The track rail 45 and the moving block 47 can be installed in the lower part of the transformer support portion 43 described above. Further, the radial movement mechanism 51 according to the present embodiment is formed with the track rail 45 as a movable side and the movement block 47 as a fixed side.

  Here, a plurality of ball rolling grooves on which balls as rolling elements roll are formed on the outer surface of the track rail 45. A moving block 47 having a plurality of ball rolling paths facing the ball rolling grooves of the track rail 45 through the track rail 45 and a plurality of balls on the inner surface is disposed.

  A loaded ball rolling path is formed inside the moving block 47 in which a plurality of balls roll under a load. A pair of direction changing paths are formed at both ends of the loaded ball rolling path, and further, an unloaded ball rolling path is formed that connects the pair of direction changing paths and rolls the ball in an unloaded state. With such a configuration, a plurality of balls can circulate indefinitely in a rolling element rolling path constituted by a loaded ball rolling path, a pair of direction changing paths, and a no-load ball rolling path.

  Since the moving block 47 is fixedly installed, when an external force is applied to the track rail 45 in the axial direction, a plurality of balls rolls in the rolling element rolling path formed in the moving block 47, thereby causing the track rail. 45 is guided and moved along the formation direction of the ball rolling groove formed on the outer surface thereof. Accordingly, the track rail 45 can linearly move in the axial direction of the track rail 45, that is, in the radial direction of the workpiece W.

  As shown in FIG. 3, the track rail 45 is installed at the tip of a cylinder 46 connected to a drive source (not shown) (for example, a power source or a hydraulic power source). Then, the track rail 45 installed at the tip of the cylinder 46 has a diameter of the workpiece W when a piston (not shown) installed inside the cylinder 46 reciprocates by a driving force from a drive source (not shown). It can move in the direction. The cylinder 46 is installed on a transformer support base 44 that serves as a base of the transformer support 43 and does not move in the radial direction of the workpiece W, so that the main body of the cylinder 46 does not move in the radial direction of the workpiece W. It has become.

  Furthermore, a heat treatment processing unit 20 is installed on a transformer support unit 43 formed by incorporating the track rail 45 via a transformer 41. Accordingly, when the track rail 45 moves in the axial direction of the track rail 45, that is, in the radial direction of the work W, with the moving block 47 as a fixed side, the track rail 45 is installed on the transformer support portion 43 formed by incorporating the track rail 45. Thus, the heat treatment portion 20 that is to be moved can also move in the radial direction of the workpiece W.

  That is, in the heat treatment apparatus 100 according to the present embodiment, the radial movement mechanism 51 can move the workpiece W in the radial direction so that the piston of the cylinder 46 and the track rail 45 installed at the tip of the cylinder 46 can be used. And a portion of the transformer support portion 43 excluding the transformer support base 44, a transformer 41 installed on the transformer support portion 43, the heat treatment processing portion 20, and the like.

  With such a configuration, the heat treatment apparatus 100 according to the present embodiment can move the heat treatment processing unit 20 to a predetermined position where heat treatment can be appropriately performed on the workpiece W having various diameters. It has become. Therefore, for example, when the heat treatment is started on the workpiece W, the heating coil 21 is used by using the radial movement mechanism 51 so that the heating coil 21 is arranged at an appropriate position according to the diameter of the workpiece W. 21 can be moved in the radial direction of the workpiece W.

  In addition, although detailed illustration was abbreviate | omitted in FIG. 2, in this embodiment, another track rail is arrange | positioned under the track rail 45, and the heat processing part 20 is used by using two track rails. You may comprise so that it may move. Such a multistage arrangement of the track rails 45 makes it possible to realize the radial movement mechanism 51 having a large stroke while saving space. By adopting the above-described configuration, for example, the heat treatment processing unit 20 can be moved so as to be in a predetermined position with respect to the peripheral surface of the work Wmax having a maximum diameter of 3100 mm from the work Wmin having a minimum diameter of 1500 mm. .

  After moving the heat treatment part 20 including the heating coil 21 to a suitable position in the radial direction of the workpiece W, the workpiece W was placed on the table 11 using the crane 17 and placed by the clamp mechanism 19. Fix the workpiece W. As described above, since the clamp mechanism 19 is configured to be able to expand and contract in accordance with the diameter of the annular workpiece W, the workpiece W is fixed on the table 11 according to the diameter of the workpiece W. Will be able to.

  Then, in accordance with the diameter of the workpiece W fixed by the clamp mechanism 19, the heat treatment processing unit 20 including the heating coil 21 is moved to an appropriate position by the above-described radial movement mechanism 51, and then two adjacent ones are moved. Heat treatment processing is performed on the peripheral surface of the workpiece W by the heat processing portion 20 (20a, 20b).

  As shown in the diagram (a) of FIG. 4, the heat treatment part 20 a on the left side of the drawing moves in the upper left direction on the drawing along the peripheral surface of the workpiece W, while the heating coil 21 a included in the heat treatment part 20 a W will be heated. 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, the heating coil 21a heats the peripheral surface of the workpiece W on the surface facing the thermal processing portion 20a while the heat processing portion 20a pivots in the upper left direction of the drawing, and then the peripheral surface of the heated workpiece W is heated. On the other hand, when the cooling water discharge part 23a discharges the cooling water, the workpiece W is cooled and heat treatment (quenching) is performed.

  On the other hand, similarly to 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 in the upper right direction of the paper along the peripheral surface of the workpiece W, as shown in the partial diagram (a) of FIG. The heating coil 21b included in the heat treatment portion 20b heats the workpiece W, and the heated workpiece W is sequentially cooled by the 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. The cooling water discharge part 23b discharges the cooling water, whereby the workpiece W is cooled and heat treatment (quenching) is performed.

  By such an operation, the two heat treatment parts 20 (20a, 20b) perform 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. 4, when the pair of heat treatment parts 20 (20 a, 20 b) moves to a position approximately halfway between the start and end of firing, approximately 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. 4, 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 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 cooling water discharge portion 23b that turns and moves thereafter.

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

  Here, at the end of firing, the two heating coils 21 (21a, 21b) are preferably adjacent to each other without a gap. If the two heating coils 21 (21a, 21b) cannot be adjacent to each other without a gap, the temperature of the workpiece W cannot be appropriately increased at the end of firing, or a seamless workpiece W can be obtained in the heat treatment. This is because it may be difficult.

  In order to allow the two heating coils 21 (21a, 21b) to be adjacent to each other without any gap at the end of firing, as shown in FIG. 5, the two heating coils 21 according to the workpiece W having various diameters. The shape of (21a, 21b) must be changed.

  Here, as shown in FIG. 5, a solid line with respect to the axis C of the center line indicated by the one-dot chain line between the two heating coils 21 (21a, 21b) and the two transformers 41 (41a, 41b). The two heating coils 21a ′ and 21b ′ corresponding to the minimum diameter workpiece Wmin shown in FIG. 6 have a larger distance than the heating coils 21a ″ and 21b ″ corresponding to the maximum diameter workpiece Wmax indicated by a broken line. ing. Accordingly, when the two heating coils 21a ′ and 21b ′ corresponding to the workpiece Wmin having the minimum diameter indicated by the solid line are used for the workpiece Wmax having the maximum diameter, the two heating coils 21a ′, There will be a gap between 21b '.

  Therefore, the heat treatment apparatus 100 according to the present embodiment moves the heat treatment processing unit 20 in the circumferential direction of the workpiece W so that the two heating coils 21a ′ and 21b ′ are adjacent to each other with no gap, for example, at the end of firing. It has a circumferential movement mechanism 52 that enables it. The circumferential movement mechanism 52 can move the two heating coils 21a 'and 21b' and the two transformers 41a and 41b in the circumferential direction.

  As shown in FIG. 5, when the heating coils 21 a ″ and 21 b ″ corresponding to the workpiece Wmax having the maximum diameter indicated by the broken line perform a turning movement with respect to the workpiece W and have moved to adjacent positions. In addition, since the first contact occurs with the two heating coils 21a ″ and 21b ″ indicated by the broken lines, the angle α with the swivel arms 30a ″ and 30b ″ indicated by the broken lines is the broken line. This is determined by the shape of the heating coils 21a '' and 21b '' shown in FIG. Further, when the two heating coils 21a ′ and 21b ′ corresponding to the workpiece Wmin having the minimum diameter shown by the solid line perform the turning movement with respect to the work W and move to the adjacent positions, first, The illustrated transformer 41a on the left side of the paper surface and the transformer 41b on the right side of the paper surface come into contact with each other. Therefore, in the case of the workpiece Wmin having the minimum diameter, the angle β between the swing arms 30a ′ and 30b ′ is determined by the thickness of the transformers 41a and 41b.

  For the circumferential movement mechanism 52, a motion guide device can be used, and for example, it can be constituted by a slide slide. That is, as shown in FIG. 2B, FIG. 3 and FIG. 6, the circumferential movement mechanism 52 is formed on the upper surface of the lower arm 33 and guides for guiding the transformer support 43 and the like. A rail 48 and a moving rail 49 for moving the transformer support 43 and the like are formed on the lower surface of the transformer support 44 included in the transformer support 43.

  The moving rail 49 arranged on the guide rail 48 can move in the circumferential direction of the workpiece W as shown by the double-headed arrow in the partial view (b) of FIG. 6 by sliding on the guide rail 48. It can be done.

  Then, for example, the heating coils 21a ′ and 21b ′ corresponding to the workpiece Wmin having the minimum diameter indicated by the solid line in FIG. 5 are commonly used for the workpiece Wmax having the maximum diameter. Will be able to.

  More specifically, referring to FIG. 7, in order to make the two heating coils 21a ′ and 21b ′ indicated by the two-dot chain line in FIG. 7 adjacent to each other without a gap, two heating coils 21a ′ are used. , 21b ′ may be moved along the guide rail 48 on the moving rail 49 installed on the lower surface of the transformer support part 43 installed above. That is, by operating the moving rail 49 and the guide rail 48 that constitute the circumferential moving mechanism 52, the two heating coils 21a 'and 21b' indicated by the two-dot chain line are indicated by double arrows in FIG. As shown, by moving the workpiece W in the circumferential direction, the two heating coils 21a ′ and 21b ′ can be adjacent to each other without a gap as shown by the solid line in FIG. In this embodiment, since the transformer support 43 including the transformer support 44 on which the moving rail 49 is installed moves in the circumferential direction of the workpiece W, two pieces installed on the transformer support 43 are provided. As shown in FIG. 7, the transformers 41a and 41b also move in the circumferential direction of the workpiece W and move from the positions of the transformers 41a and 41b indicated by the two-dot chain lines to the positions of the transformers 41a and 41b indicated by the solid lines. Become.

  The two heating coils 21 a ′ and 21 b ′ that are adjacent to each other without a gap can be appropriately heated so as to have a temperature equal to or higher than the temperature at which the workpiece W is austenitized. After the workpiece W heated by the two heating coils 21a ′ and 21b ′ is cooled by the two cooling water discharge portions 23 (23a and 23b), as shown in a partial diagram (d) of FIG. The two heat treatment parts 20 (20a, 20b) are retracted from the end of firing, cooled by a cooling device 26 fixedly installed at the end of firing, and the workpiece W is hardened at the end of firing in a uniform state. Will be done without.

  Therefore, the heat treatment apparatus 100 according to the present embodiment can perform economical quenching seamlessly on the annular workpiece W having various diameters while maintaining uniform quenching quality. Yes.

  The heat treatment processing part moving mechanism 50 according to the present embodiment has been described above. Next, a heat treatment apparatus 120 according to the second embodiment will be described with reference to FIGS. Here, FIG. 8 is a diagram illustrating an overall configuration example of the heat treatment apparatus according to the second embodiment. FIG. 9 is a schematic diagram for explaining the position / distance between the conventional heating coil and the workpiece, and FIG. 10 is a schematic diagram illustrating an example of the heating coil angle changing means according to the second embodiment. is there. In addition, about the structure same or similar to embodiment mentioned above, description may be abbreviate | omitted by attaching | subjecting the same code | symbol.

[Second Example]
As shown in FIG. 8, the heat treatment apparatus 120 according to the second embodiment includes a table 11 on which an annular workpiece W can be placed, and two heat treatment portions 20 for heat treating the peripheral surface of the workpiece W. (20a, 20b).

  And the two heat processing part 20 (20a, 20b) is respectively the heating coil 21 (21a, 21b) for heating the workpiece | work W, and the cooling water discharge | release part 23 (23a, 23b) for cooling the workpiece | work W. ) (Similar to FIG. 4).

  Further, the heat treatment apparatus 120 according to the second embodiment is a heating coil angle changing means for controlling the two heating coils 21 (21a, 21b) and the peripheral surface of the facing workpiece W to be located at a predetermined distance. 53 is provided in each of the two heating coils (21a, 21b).

  As shown in FIG. 10, the heating coil angle changing means 53 is disposed on the peripheral surface of the workpiece W with the heating coil 21 and the workpiece W separated, and a tracking roller 28 for causing the heating coil 21 to follow the workpiece W, A heating coil angle adjustment that adjusts the angle of the heating coil 21 so that the heating coil 21 is rotated and the heating coil 21 is rotated so that the circumferential surface of the workpiece W facing the heating coil 21 is positioned at a predetermined position and distance. And a core mechanism 22.

  As shown in FIGS. 9 and 10, the heat treatment apparatus 120 according to the second embodiment is configured so that the two heating coils 21 (21 a and 21 b) can be adjacent to each other without any gap at the end of the firing. 21 (21a, 21b) is arranged in a state inclined by 3.5 ° with respect to the normal of the workpiece W.

  As shown in FIG. 8, the follower roller 28 is installed on the upper portion of the transformer 41, and the work W is separated from the heating coil 21 by the follower roller pressing mechanism 29 that presses the follower roller 28 against the work W. Are arranged on the peripheral surface (in the case of FIG. 8, the inner peripheral surface of the workpiece W). And two heat processing part 20 (20a, 20b) containing the two heating coils 21 (21a, 21b) is mutually opposite direction along the surrounding surface of the workpiece | work W by the turning arm 30 (30a, 30b), respectively. When the quenching is carried out while moving, the follower rollers 28 (28a, 28b) can rotate around the rotation axis while being pressed against the work W by the follower roller pressing mechanism 29 installed in each. ing. With the follower roller 28, the distance A between the center portion of the heating coil 21 and the workpiece W is set to a predetermined distance at any position on the peripheral surface of the workpiece W.

  Incidentally, as shown in FIG. 9, in the conventional heat treatment apparatus, the position of the heating coil 21 on the peripheral surface of the workpiece W with respect to the distance A between the center portion of the heating coil 21 and the workpiece W by the action of the tracking roller 28. But it was a predetermined distance. However, the distance B between the tip of the moving direction of the heating coil 21 and the work W changes as the heating coil 21 moves. That is, the distance B has a different value depending on the position of the heating coil 21 with respect to the workpiece W. The cause of this phenomenon is that the follower roller 28 moves while rotating along the circumferential surface of the workpiece W while pressing the circumferential surface of the workpiece W, whereas the heating coil 21 moves in the horizontal direction on the paper surface. It is conceivable to float.

  Therefore, in the heat treatment apparatus 120 according to the second embodiment, the distance A between the center portion of the heating coil 21 and the workpiece W is kept constant by including the heating coil angle alignment mechanism 22 in addition to the follower roller 28. At the same time, the distance B between the tip of the heating coil 21 in the moving direction and the workpiece W can be maintained at a predetermined distance B ′ (see FIGS. 9 and 10).

  That is, the heating coil angle alignment mechanism 22 has, for example, a rotary bearing disposed around it, and the heating coil 21 rotates as the heating coil angle alignment mechanism 22 rotates as shown by the double arrows in FIG. And the distance of the front-end | tip part of the moving direction of the heating coil 21 and the workpiece | work W can be adjusted now.

  Then, as shown in FIG. 10, the heating coil 21 is heated so that the angle with the peripheral surface of the workpiece W facing the heating coil 21 is a predetermined angle (3.5 ° in the second embodiment). A guide roller 25 for guiding the coil 21 and a guide roller support portion 24 for installing the guide roller 25 on the heating coil 21 can be provided.

  The guide roller 25 can move along the peripheral surface of the workpiece W while rotating while contacting the peripheral surface of the workpiece W. When the guide roller 25 is brought into contact with the workpiece W, the angle of the heating coil 21 is deviated from a predetermined angle (3.5 ° in the second embodiment), and the heating coil 21 is moved to the left in the drawing or When it has tilted to the right, the heating coil angle alignment mechanism 22 acts, and the heating coil 21 on which the heating coil angle alignment mechanism 22 is installed has a predetermined angle (3.5 in the second embodiment). °).

  In addition, each guide roller 25 installed in the two heating coils 21 (21a, 21b) changes the height installed in the heating coil 21, for example, thereby changing the two adjacent heating coils 21 ( 21a, 21b) can be adjacent to each other without a gap.

  With such a configuration, the heat treatment apparatus 120 according to the second embodiment can economically perform uniform quenching seamlessly over the entire circumference of the annular workpiece.

  The heat treatment apparatus 120 according to the second embodiment has been described above.

  In addition, the workpiece | work W which heat-processed by the heat processing apparatus 100 which concerns on this embodiment, and the heat processing apparatus 120 which concerns on a 2nd Example is used as an outer ring | wheel or inner ring | wheel of a turning bearing, for example. The slewing bearing will be described with reference to FIGS. 11 and 12. Here, FIG. 11 is a perspective view including a partial cross section of the slewing bearing, and FIG. 12 is a sectional view of the slewing bearing.

  FIG. 11 and FIG. 12 show a slewing bearing incorporating a slewing bearing spacer. Each of the outer ring 55 and the inner ring 56 is formed with substantially V-shaped rolling surfaces 55a and 56a. A roller rolling path 57 having a substantially square cross section, for example, a substantially square shape, is formed between 55a and 56a. A plurality of rollers 58a, 58b,... Are arranged and stored in the roller rolling path with their inclination directions being alternately intersected. A slewing bearing spacer 59 (hereinafter referred to as a spacer) indicated by hatching in FIG. 11 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 substantially 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 substantially 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.

  In addition, according to the heat treatment apparatus 100 according to the present embodiment, the inner ring 56 of the slewing bearing is not only composed of a substantially rectangular workpiece W having a substantially U-shaped notch in sectional view, A heat treatment can also be performed on the outer ring 55 of the slewing bearing that is configured by arranging the annular workpiece W having a substantially trapezoidal shape in cross section in the vertical direction.

  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 and the heat treatment apparatus 120 according to the second example 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, after heating to an appropriate temperature by the heating coil 21, the workpiece W can be cooled or gradually cooled by the cooling water discharge portion 23.

  Further, in the heat treatment apparatus 100 according to the present embodiment, the work W is fixed on the table 11, the heat treatment processing unit 20 is moved in the radial direction according to the diameter of the work W by the heat treatment processing unit moving mechanism 50, and then swiveled. The description has been made on the assumption that the heat treatment is performed by turning the heat treatment portion 20 by the arm 30. The relative positional relationship between the workpiece W and the heat treatment portion 20 has been described with reference to FIG. Any heat treatment apparatus may be used as long as it can realize an operation example of the heat treatment apparatus, and the heat treatment apparatus 100 may be operated so that the heat treatment processing unit 20 is swung by the swivel arm 30 while the work W on the table 11 is rotated.

  Further, for example, in the heat treatment apparatus 120 according to the second embodiment, the heating coil angle alignment mechanism 22 is connected to a motor (not shown), and the angle between the heating coil 21 and the peripheral surface of the work W facing the heating coil 21 is not shown. It is also possible to install an angle sensor. When the angle between the heating coil 21 measured by the angle sensor and the peripheral surface of the workpiece W facing the deviating angle deviates from a predetermined angle (3.5 ° in the second embodiment), it is not shown. The heating coil angle alignment mechanism 22 is rotated by a motor so that the heating coil 21 has a predetermined angle (3.5 ° in the second embodiment). As the heating coil angle alignment mechanism 22 rotates, the heating coil 21 provided with the heating coil angle alignment mechanism 22 also rotates. Therefore, the heating coil 21 can hold a predetermined angle (3.5 ° in the second embodiment). The angle sensor may be a distance sensor.

  Further, for example, the heat treatment apparatus 120 according to the second embodiment may be provided with a resin guide plate that is installed adjacent to the left and right direction of the heating coil 21 in place of the guide roller 25. Similar to the guide roller 25 described above, the guide plate can move along the peripheral surface of the workpiece W while being in contact with the peripheral surface of the workpiece W. When the guide plate is brought into contact with the workpiece W, the angle of the heating coil 21 deviates from a predetermined angle (3.5 ° in the second embodiment), and the heating coil 21 moves to the left or right of the page. When tilted in the direction, the heating coil angle alignment mechanism 22 rotates, and the angle of the heating coil 21 in which the heating coil angle alignment mechanism 22 is installed can be adjusted.

  Furthermore, in the heat treatment apparatus 100 according to the present embodiment and the heat treatment apparatus 120 according to the second example, the example in which the heat treatment processing is performed on the constituent member of the slewing bearing as the workpiece W has been described, but the present invention is limited to this. It can be used for any annular workpiece.

  In the heat treatment apparatus 100 according to the present embodiment, the heat treatment processing unit moving mechanism 50 is installed on the lower arm 33 so that the swivel arm 30 can be moved in the radial direction and the circumferential direction with respect to the annular workpiece W. The spline shaft as the track member of the motion guide device can be incorporated into the lower surface of the upper arm 31, and the spline nut as the moving member of the motion guide device can 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, 120 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, 22 Heating coil angle Alignment mechanism, 23 Cooling water discharge part, 24 Guide roller support part, 25 Guide roller, 26 Cooling device, 27 Heating coil mounting part, 28 Follow roller, 29 Follow roller pressing mechanism, 30 Swing arm, 31 Upper arm, 32 Vertical Arm, 33 Lower arm, 41 Transformer, 43 Transformer support, 44 Transformer support, 45 Track rail, 46 Cylinder, 47 Moving block, 48 Guide rail, 49 Moving rail, 50 Heat treatment processing section moving mechanism, 51 Radial movement Mechanism, 52 circumferential movement mechanism, 53 heating carp Angle changing means, 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 Lubrication hole, A distance, B, B ′ Tip distance, C axis, P rotation center line, P1, P2 swivel center line, W workpiece.

Claims (6)

A table on which an annular workpiece can be placed;
An even number of heat treated portions for heat treating the peripheral surface of the workpiece; and
With
In the heat treatment apparatus used to obtain a workpiece having a desired property by performing heat treatment on the workpiece while moving the even number of heat treatment portions in opposite directions along the peripheral surface of the workpiece,
The heat treatment processing that enables the even number of heat treatment processing portions to move so that the heat treatment processing portions can cooperate with the adjacent heat treatment processing portions to uniformly heat treat the peripheral surface of the workpiece seamlessly. A heat treatment apparatus comprising a part moving mechanism. The heat treatment apparatus according to claim 1,
The heat treatment processing part moving mechanism is:
A radial movement mechanism that allows the heat treatment portion to move in the radial direction of the workpiece;
A circumferential movement mechanism that allows the heat treatment portion to move in the circumferential direction of the workpiece;
With
When starting the heat treatment of the workpiece, the adjacent heat treatment portions can be arranged on the peripheral surface of the workpiece by the radial movement mechanism, and the adjacent heat treatment portions are arranged along the peripheral surface of the workpiece. The workpiece is heat treated while moving in opposite directions, and when the heat treated portion moves to a position adjacent to the heat treated portion, the adjacent heat treated portions are moved to each other by the circumferential movement mechanism. A heat treatment apparatus characterized by being capable of heat-treating the workpieces having various diameters arranged without gaps and uniformly heat-treating the peripheral surface of the workpiece. The heat treatment apparatus according to claim 2,
A heat treatment apparatus using a motion guide device for the axial direction moving mechanism and the circumferential direction moving mechanism. A table on which an annular workpiece can be placed;
An even number of heat treated portions for heat treating the peripheral surface of the workpiece; and
With
In the heat treatment apparatus used to obtain a workpiece having a desired property by performing heat treatment on the workpiece while moving the even number of heat treatment portions in opposite directions along the peripheral surface of the workpiece,
The heat treatment portion includes a heating coil for heating the peripheral surface of the workpiece,
A heat treatment apparatus comprising heating coil angle changing means for controlling the heating coil and the peripheral surface of the work facing the heating coil to be positioned at a predetermined distance. The heat treatment apparatus according to claim 4, wherein
The heating coil angle changing means is disposed on a peripheral surface of the work with the heating coil and the work being separated from each other, and includes a follow-up roller for causing the heating coil to follow the work. In the heat treatment apparatus according to claim 4 or 5,
The heating coil angle changing means adjusts the angle of the heating coil so that a rotation axis of the heating coil becomes a predetermined distance by rotating the heating coil so that the peripheral surface of the workpiece facing the heating coil is located at a predetermined distance. A heat treatment apparatus having a heating coil angle alignment mechanism to be adjusted.

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