JP2013216959A - Thermal treatment equipment for ring-shaped member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide thermal treatment equipment for a ring-shaped member, capable of improving production efficiency of products while introducing high frequency induction heating.SOLUTION: High frequency hardening equipment 1 includes: a heating part subjecting outer rings 90 to induction heating; holding parts 51 holding the outer rings 90; and a cooling liquid tank quench-hardening the outer rings 90 by cooling the outer rings 90 having been subjected to induction heating. The heating part includes a plurality of coils 11 arranged along outer peripheral surfaces of the outer rings so as to face a part of the outer peripheral surfaces of the outer rings 90 and movable in the radial direction of the outer ring 90. The holding parts 51 hold the outer rings so that the peripheral surfaces of the outer rings face the coils 11 while the plurality of outer rings 90 are arranged in the axial direction thereof.

Description

  The present invention relates to a heat treatment facility for a ring-shaped member, and more particularly to a heat treatment facility for a ring-shaped member for quenching a ring-shaped member made of steel.

Like bearing ring of the rolling bearing, quench hardening process of the ring-shaped member made of steel, after which the ring-shaped member is heated to a temperature range of not lower than the A ₁ transformation point, it is cooled to a temperature below M _S point Is implemented. And the heating in this process can be implemented, for example using a mesh belt type | mold continuous furnace (for example, refer nonpatent literature 1). This mesh belt type continuous furnace can be charged with a large amount of heat-treated material. Therefore, by using a mesh belt type continuous furnace, particularly in the case of a small ring-shaped member, it is possible to heat-treat a large number of ring-shaped members in a short time and improve the production efficiency of the product.

  However, the atmosphere heating furnace that heats the object to be processed by heating the atmosphere in the furnace, including the mesh belt type continuous furnace, needs to heat not only the object to be processed but also the atmosphere by the input energy. Therefore, there is a problem that energy efficiency is low. Further, members arranged in the atmosphere heating furnace, such as the belt of the driving unit of the mesh belt type continuous furnace, are heated to a high temperature by the heated atmosphere. Therefore, there is a problem that the member is easily damaged by heat.

  On the other hand, the heat processing method by the high frequency induction heating which heats a to-be-processed object using the induction heating by a high frequency current is proposed (for example, refer patent document 1). According to this method, the workpiece can be directly heated by induction heating, so that high energy efficiency can be achieved.

JP 2000-104120 A

Taizo Hara, "Design and Practice of Heat Treatment Furnace", revised edition, Shin Nippon Casting & Forging Press, 1998, p.24

  However, when the heat treatment method using high frequency induction heating as disclosed in Patent Document 1 is applied to the heat treatment of the ring-shaped member, the diameter of the coil is changed each time the diameter of the ring-shaped member to be heat-treated is changed. Need to be changed. Therefore, each time the diameter of the ring-shaped member to be heat-treated is changed, there is a problem that the production efficiency of the product is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat treatment facility for a ring-shaped member that can improve product production efficiency while employing high-frequency induction heating. That is.

  The heat treatment equipment for a ring-shaped member according to the present invention is a heat treatment equipment for a ring-shaped member for quenching a ring-shaped member made of steel. The heat treatment facility includes a heating unit that induction-heats the ring-shaped member, a holding unit that holds the ring-shaped member, and a cooling unit that quenches and cures the ring-shaped member by cooling the induction-heated ring-shaped member. I have. A heating part is arrange | positioned along a surrounding surface so that a part of surrounding surface of a ring-shaped member may be faced, and contains the some coil which can move to the radial direction of a ring-shaped member. And a holding part hold | maintains so that a surrounding surface may face a coil in the state which arranged the ring-shaped member in the axial direction.

  In the heat treatment facility of the present invention, a plurality of coils are arranged along the peripheral surface so as to face a part of the peripheral surface of the ring-shaped member, and are movable in the radial direction of the ring-shaped member. Therefore, even when the diameter of the ring-shaped member is changed, the ring-shaped member can be heated without changing the coil by moving each coil in the radial direction according to the diameter of the ring-shaped member to be heat-treated. Can be maintained. As a result, it is possible to suppress a decrease in production efficiency associated with coil replacement. Moreover, in the heat treatment equipment of the present invention, the holding unit holds the ring-shaped members arranged in the axial direction so that the peripheral surface faces the coil. Therefore, a plurality of ring-shaped members can be heated simultaneously. As a result, production efficiency can be further improved. Thus, according to the heat treatment equipment for a ring-shaped member of the present invention, it is possible to provide a heat treatment equipment for a ring-shaped member capable of improving the production efficiency of a product while employing high-frequency induction heating.

  In the heat treatment facility for the ring-shaped member, the region of the coil to be opposed to the peripheral surface of the ring-shaped member may have an arc shape in a cross section perpendicular to the axis of the ring-shaped member to be heated. Good.

  Thereby, the dispersion | variation in the distance of the surrounding surface of a ring-shaped member and a coil is reduced in the circumferential direction. As a result, the ring-shaped member can be stably heated. Further, the rigidity of the coil is increased, and deformation of the coil due to electromagnetic force can be suppressed.

  In the heat treatment facility for the ring-shaped member, the region of the coil to be opposed to the peripheral surface of the ring-shaped member is not less than the radius of curvature of the peripheral surface to be opposed in a cross section perpendicular to the axis of the ring-shaped member to be heated. The curvature radius may be as follows. By doing in this way, the range of the diameter of the ring-shaped member which can be heated can be expanded.

  In the heat treatment facility for the ring-shaped member, the plurality of coils are opposed to a region of 10% to 50% with respect to the entire circumference of the peripheral surface in a cross section perpendicular to the axis of the ring-shaped member to be heated. May be arranged.

  If the area of the peripheral surface facing the coil is less than 10%, the power to be applied to the coil becomes too large. On the other hand, if the area of the peripheral surface facing the coil exceeds 50%, the range of the diameter of the ring-shaped member that can be heated becomes narrow. By setting the region of the peripheral surface facing the coil to be 10% or more and 50% or less of the peripheral surface, it is possible to widen the diameter range of the ring-shaped member that can be heated while suppressing the power to be applied to the coil. .

  In the heat treatment facility for the ring-shaped member, the coil may be rotatable relative to the ring-shaped member along the circumferential direction of the ring-shaped member. Thereby, it becomes easy to heat a ring-shaped member uniformly.

  The ring-shaped member heat treatment facility may further include a radiation thermometer that measures the temperature of the ring-shaped member during induction heating. Thereby, it becomes easy to manage the heating temperature of the ring-shaped member.

  The heat treatment facility for the ring-shaped member may further include a transport unit that transports the ring-shaped member induction-heated in the heating unit to the cooling unit. Thereby, quench hardening by cooling after heating can be implemented easily.

  In the heat treatment facility for the ring-shaped member, the ring-shaped member may be a rolling bearing race. The above heat treatment equipment, which employs high-frequency induction heating with high energy efficiency and is excellent in product production efficiency, is suitable as a heat treatment equipment for bearing races that require a reduction in manufacturing costs.

  In the heat treatment facility for the ring-shaped member, the holding portion may hold the ring-shaped member in a state in which a plurality of ring-shaped members are arranged in the axial direction so that the central axes coincide with each other. Thereby, it becomes easy to heat a some ring-shaped member uniformly.

  In the heat treatment facility for the ring-shaped member, the holding portion may hold the ring-shaped member while moving the ring-shaped member in the axial direction. Thereby, it can heat efficiently, conveying a plurality of ring-shaped members individually.

  In the heat treatment facility for the ring-shaped member, the heating unit may include a preheating coil and a soaking coil arranged side by side in the axial direction. Thereby, after heating a ring-shaped member beforehand with a preheating coil, it can be hold | maintained at the temperature suitable for a quench hardening process by the heating by a soaking | uniform-heating coil.

  In the heat treatment facility for the ring-shaped member, the holding portion may hold the ring-shaped member in a state of being stacked in the axial direction. Thereby, it becomes easy to heat a some ring-shaped member more efficiently.

  In the heat treatment facility for the ring-shaped member, the cooling unit may be disposed immediately below the heating unit. Thereby, the quench hardening process by the cooling after a heating can be implemented efficiently.

  In the heat treatment facility for the ring-shaped member, an openable and closable partition may be provided between the cooling unit and the heating unit. Thereby, it becomes easy to arrange | position a cooling part and a heating part closely.

  The heat treatment facility for the ring-shaped member may further include a discharge member that discharges the ring-shaped member from the cooling unit. Thereby, the ring-shaped member after cooling can be easily taken out from the cooling unit.

  As is apparent from the above description, according to the heat treatment equipment for ring-shaped members of the present invention, it is possible to provide a heat treatment equipment for ring-shaped members that can improve the production efficiency of products while employing high-frequency induction heating. Can do.

2 is a schematic top view showing the structure of the heat treatment facility in Embodiment 1. FIG. 2 is a schematic side view showing the structure of the heat treatment facility in Embodiment 1. FIG. 3 is a flowchart showing an outline of a heat treatment process for a ring-shaped member in the first embodiment. FIG. 6 is a schematic diagram for explaining a heat treatment process for a ring-shaped member in a second embodiment. FIG. 6 is a schematic diagram for explaining a heat treatment process for a ring-shaped member in a second embodiment. It is a schematic side view which shows the structure of the heat processing equipment in Embodiment 2. FIG. 6 is a schematic diagram for explaining a heat treatment process for a ring-shaped member in a second embodiment. FIG. 6 is a schematic diagram for explaining a heat treatment process for a ring-shaped member in a second embodiment. FIG. 6 is a schematic diagram for explaining a heat treatment process for a ring-shaped member in a second embodiment. 6 is a flowchart showing an outline of a heat treatment process for a ring-shaped member in the second embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
First, the heat treatment equipment in Embodiment 1 which is one embodiment of the present invention will be described. Referring to FIGS. 1 and 2, induction hardening equipment 1 as a heat treatment equipment for a ring-shaped member in Embodiment 1 is an outer ring 90 of a rolling bearing made of steel containing, for example, 0.4 mass% or more of carbon. This is a heat treatment facility for quenching the (ring-shaped member). The induction hardening apparatus 1 includes a heating unit that induction-heats the outer ring 90, a holding unit 51 that holds the outer ring 90, and a cooling unit that quenches and hardens the outer ring 90 by cooling the outer ring 90 that has been induction-heated. And a liquid tank 60. The heating unit includes a plurality of soaking coils 11 and a preheating coil 13 that are arranged along the outer peripheral surface so as to face a part of the outer peripheral surface of the outer ring 90 and are movable in the radial direction of the outer ring 90. And the holding | maintenance part 51 hold | maintains so that an outer peripheral surface may face the soaking | uniform-heating coil 11 and the preheating coil 13 in the state which arranged the outer ring | wheel 90 in the axial direction.

  More specifically, the heating unit includes a plurality of preheating coils 13 (four in the present embodiment) arranged along the outer circumferential surface of the outer ring 90 so as to surround the outer ring 90 from the radially outer side, and each preheating. A soaking coil 11 disposed on the coil 13 and a support arm 12 connected to each of the soaking coil 11 and the preheating coil 13 to support the soaking coil 11 and the preheating coil 13 so as to be movable in the radial direction of the outer ring 90. And a high frequency power source (not shown) connected to the soaking coil 11 and the preheating coil 13. The preheating coil 13 and the soaking coil 11 are arranged side by side in the axial direction of the outer ring 90 to be heat-treated. The support arm 12 is connected to a drive device such as a hydraulic cylinder. Then, by operating the driving device, the support arm 12 moves the soaking coil 11 and the preheating coil 13 in the radial direction of the outer ring 90. Thereby, even when the diameter of the outer ring 90 is changed, it is possible to move the soaking coil 11 and the preheating coil 13 to appropriate positions according to this and heat the outer ring without replacing the coil. Yes.

  Further, various shapes can be selected for the soaking coil 11 and the preheating coil 13, but the soaking coil 11 and the preheating coil 13 to be opposed to the outer peripheral surface of the outer ring 90 as shown in FIG. The region preferably has an arc shape in a cross section perpendicular to the axis of the outer ring 90. By doing in this way, the dispersion | variation in the distance of the outer peripheral surface of the outer ring | wheel 90 and the soaking | uniform-heating coil 11 and the preheating coil 13 is reduced in the circumferential direction, and the stable heating of the outer ring | wheel 90 is attained. Referring to FIG. 2, at the time of induction heating, electromagnetic force is generated in such a direction that the upper and lower ends of soaking coil 11 and preheating coil 13 are bent toward the outer ring 90 or toward the outer ring 90. On the other hand, by adopting the arc shape as described above, the rigidity against the electromagnetic force is improved, and deformation due to the electromagnetic force can be suppressed. In order to suppress the deformation more reliably, a deformation preventing member may be installed in the soaking coil 11 and the preheating coil 13. Specifically, for example, a deformation preventing member made of ceramic as an insulator may be installed in the soaking coil 11 and the preheating coil 13.

  The holding part 51 holds the outer ring 90 so as to face the soaking coil 11 and the preheating coil 13 in a state where a plurality of outer rings 90 are arranged in the axial direction so that the central axes coincide with each other. Referring to FIG. 2, holding portion 51 holds outer ring 90 while moving each outer ring 90 in the direction of arrow β (axial direction). Furthermore, it is preferable that the holding part 51 holds the outer ring 90 while rotating each outer ring 90 in the direction of the arrow α.

  The cooling liquid tank 60 holds a cooling liquid 61 such as quenching oil maintained at an appropriate temperature. The induction hardening equipment 1 further includes a cooling conveyor 41 as a transport unit that transports the outer ring 90 that has been heated by the preheating coil 13 and the soaking coil 11 to the coolant tank 60. The induction hardening equipment 1 further includes a charging conveyor 31 that moves the outer ring 90 to a position where the outer ring 90 can be held by the holding unit 51.

  Further, referring to FIG. 1, the induction hardening equipment 1 includes a radiation thermometer 21 that measures the temperature of the outer ring 90 during induction heating by the preheating coil 13 and the soaking coil 11.

  Next, the procedure of quench hardening processing of the outer ring 90 using the induction hardening equipment 1 will be described. Referring to FIG. 3, in the quench hardening process of outer ring 90 in the present embodiment, a ring-shaped member preparation step is first performed as a step (S10). In this step (S10), an outer ring 90 that is a ring-shaped member is prepared. More specifically, for example, steel materials such as JIS standard machine structural carbon steel, JIS standard machine structural alloy steel, and JIS standard high carbon chromium bearing steel containing 0.4 mass% or more of carbon are prepared. The outer ring 90 is produced by processing such as forging and turning.

  Next, a coil adjustment process is implemented as process (S20). In this step (S20), the diameter of the outer ring 90 prepared in step (S10) is moved by moving the preheating coil 13 and the soaking coil 11 supported by the support arm 12 in the diameter direction of the outer ring 90 to be heat-treated. The positions of the preheating coil 13 and the soaking coil 11 are adjusted according to the above.

Next, a heating step is performed as a step (S30). In this step (S30), the outer ring 90 is heated to a temperature range in excess of _{A 1} transformation point. Specifically, referring to FIG. 2, outer ring 90 prepared in step (S <b> 10) is first placed on loading conveyor 31. The mounted outer ring 90 is conveyed by the loading conveyor 31 and is held by the holding unit 51. The outer ring 90 is sequentially conveyed to a position where it can be held by the holding unit 51 by the loading conveyor 31. The outer ring 90 held by the holding part 51 moves in the direction of arrow β, and enters the position where the outer peripheral surface faces the preheating coil 13. Further, the outer ring 90 held by the holding part 51 moves in the direction of arrow β, and enters the position where the outer peripheral surface faces the soaking coil 11. At this time, a high-frequency current flows through the preheating coil 13 and the soaking coil 11 by power supplied from a high-frequency power source (not shown). As a result, the outer ring 90 is heated by induction heating from the outer peripheral surface side. Further, at this time, the outer ring 90 rotates uniformly in the direction along the arrow α, and the outer peripheral surface passes through the region facing the preheating coil 13 and the soaking coil 11 to be uniformly heated. The heating state of the outer ring 90 is monitored by the radiation thermometer 21 (see FIG. 1).

Next, a conveyance process is implemented as process (S40). In this step (S40), an outer ring 90 which is heated to a temperature range of not lower than the A ₁ transformation point by soaking the coil 11 is conveyed to the cooling liquid tank 60 by the cooling conveyor 41.

Next, a cooling step is performed as a step (S50). In this step (S50), the outer ring 90 conveyed by the cooling conveyor 41 is immersed in the cooling liquid 61 held in the cooling liquid tank 60, so that the temperature is not lower than the A ₁ transformation point and lower than the M _S point. Cooled to a temperature range and hardened by hardening. By the above procedure, the quench hardening process of the outer ring 90 using the induction hardening equipment 1 is completed. The outer ring 90 that has been subjected to the quench hardening process is then subjected to a tempering process and a finishing process (such as polishing of the rolling surface) to become a finished product.

  In the induction hardening equipment 1, a plurality of preheating coils 13 and soaking coils 11 are arranged along the outer peripheral surface so as to face a part of the outer peripheral surface of the outer ring 90 and are movable in the radial direction of the outer ring 90. It has become. Therefore, even when the diameter of the outer ring 90 is changed, the outer ring 90 can be heated without changing the coil by moving each preheating coil 13 and the soaking coil 11 in the radial direction according to the diameter of the outer ring 90. Can be maintained. As a result, it is possible to suppress a decrease in production efficiency associated with coil replacement. Further, the holding portion 51 sequentially moves in the axial direction while holding the outer ring 90 in a state where a plurality of outer rings 90 are arranged in the axial direction so that the outer peripheral surface faces the preheating coil 13 and the soaking coil 11. Therefore, the plurality of outer rings 90 can be heated simultaneously. As a result, production efficiency can be further improved. Thus, the induction hardening equipment 1 is a heat treatment equipment for ring-shaped members that can improve the production efficiency of products while adopting induction heating.

  Further, in the induction hardening equipment 1, the regions of the preheating coil 13 and the soaking coil 11 that should face the outer peripheral surface of the outer ring 90 are the radii of curvature of the outer peripheral surface 90 that should face in the cross section perpendicular to the axis of the outer ring 90. It is preferable to have the above curvature radius. More specifically, the curvature radii of the preheating coil 13 and the soaking coil 11 coincide with the curvature radii of the outer ring 90 having the largest diameter among the outer rings 90 to be heat-treated in the induction hardening equipment 1, for example. May be set. Thereby, the range of the diameter of the heatable outer ring 90 can be widened.

  Further, in the induction hardening equipment 1, the preheating coil 13 and the soaking coil 11 are in a region of 10% or more and 50% or less with respect to the entire circumference of the outer peripheral surface of the outer ring 90 in a cross section perpendicular to the axis of the outer ring 90. It is preferable to arrange so as to face each other. Thereby, the range of the diameter of the heatable outer ring 90 can be widened while suppressing the power to be applied to the coil.

  In addition, although the said preheating coil 13 is not an essential structure, it will become easy to achieve the stable heating state by installing the preheating coil 13. FIG.

(Embodiment 2)
Next, a heat treatment facility for a ring-shaped member according to Embodiment 2, which is another embodiment of the present invention, and a heat treatment method for the ring-shaped member using the heat treatment facility will be described with reference to FIGS. .

  The induction hardening equipment 1 as the heat treatment equipment for the ring-shaped member in the second embodiment has basically the same configuration as that of the first embodiment and has the same effects. However, the first embodiment has a configuration in which a plurality of outer rings 90 are individually conveyed, whereas the second embodiment has a configuration in which a plurality of outer rings 90 are conveyed together. The second embodiment is different from the first embodiment.

  Specifically, referring to FIG. 6 and FIG. 2, in induction hardening equipment 1 in Embodiment 2, preheating coil 13 in Embodiment 1 is not provided, and heating coil 11 corresponding to soaking coil 11 is provided. Is provided. Further, in place of the holding portion 51 that holds the outer ring 90 while moving the outer ring 90 in the direction of arrow β, in the second embodiment, as the holding portion that holds the outer ring 90 in a state where the outer rings 90 are stacked in the axial direction. The holding arm 71 is employed. In the second embodiment, the coolant tank 60 is disposed immediately below the heating coil 11, and an openable / closable partition wall 62 is provided between the coolant tank 60 and the heating coil 11.

  Next, the procedure of the quench hardening process of the outer ring 90 using the induction hardening equipment 1 in the second embodiment will be described. With reference to FIG. 10, a ring-shaped member preparation process is first implemented as process (S10). This step (S10) is performed in the same manner as in the first embodiment, and the outer ring 90 to be hardened by hardening is prepared.

  Next, a stacking process is implemented as process (S11). In this step (S11), referring to FIG. 4, a plurality of outer rings 90 are stacked in the axial direction so that the central axes coincide with each other, for example, by a robot or the like.

  Next, a 1st conveyance process is implemented as process (S12). In this step (S12), referring to FIG. 5, the holding arm 71 is inserted so as to penetrate the inner peripheral side of the outer ring 90 stacked in the step (S11), and the engaging portion formed at the tip portion is formed. The outer ring 90 is engaged with the end face, and the stacked outer rings 90 are lifted. Then, the stacked outer rings 90 are conveyed to the vicinity of the heating coil 11 as shown in FIG. Thereafter, the stacked outer rings 90 move along the arrow and are set at a position where heating by the heating coil 11 is possible.

  Next, a coil adjustment process is implemented as process (S20). In this step (S <b> 20), as shown in FIG. 7, the position of the heating coil 11 is adjusted in the same manner as in the first embodiment, and the stacked outer rings 90 are heated by the heating coil 11.

Next, a heating process is implemented as process (S30). In this step (S30), electric power is supplied to the heating coil 11 from a high frequency power source (not shown), and a high frequency current flows. As a result, the outer ring 90 is heated by induction heating from the outer peripheral surface side. At this time, as the holding arm 71 rotates, the outer ring 90 rotates in the direction along the arrow α and is heated uniformly. Thus, the outer ring 90 is heated to a temperature range of not lower than the A ₁ transformation point.

Next, a 2nd conveyance process is implemented as process (S40). In this step (S40), an outer ring 90 which is heated to a temperature range of not lower than the A ₁ transformation point in the step (S30) is conveyed to the cooling liquid tank 60 as a cooling unit. At this time, in the induction hardening equipment 1 according to the second embodiment, the coolant tank 60 is disposed immediately below the heating coil 11. Therefore, the step (S40) can be performed by lowering the holding arm 71 while holding the stacked outer ring 90.

Next, a cooling step is performed as a step (S50). In this step (S <b> 50), referring to FIG. 8, first, the partition wall 62 is opened, and the stacked outer ring 90 is allowed to enter the coolant tank 60. Thereafter, the holding arm 71 is lowered, so that the outer ring 90 is immersed in the coolant 61. At this time, as shown in FIG. 9, the holding arm 71 is disengaged from the outer ring 90, and the holding arm 71 is pulled up from the coolant 61. Thus, the outer ring 90 by being cooled from a temperature range of not lower than the A ₁ transformation point to a temperature range below M _S point, is quench-hardened. The quenched and hardened outer ring 90 is discharged from the cooling liquid tank 60 by a discharging conveyor 72 installed in the cooling liquid tank 60. By the above procedure, the quench hardening processing of the outer ring 90 using the induction hardening equipment 1 in the second embodiment is completed. The outer ring 90 that has been subjected to the quench hardening process is then subjected to a tempering process and a finishing process (such as polishing of the rolling surface) to become a finished product.

  The induction hardening equipment 1 according to the second embodiment has the same effect as that of the first embodiment, and the mechanism is simpler than the induction hardening equipment 1 according to the first embodiment except for the holding arm 71. Therefore, it has the feature that it is easy to make the equipment compact. As is clear from the above description, the holding arm 71 as the holding unit in the second embodiment has the same function as that of the loading conveyor 31 in the first embodiment, and for cooling in the first embodiment. It also functions as a transport unit corresponding to the conveyor 41.

  In the above embodiment, the case where the outer ring 90 of the bearing is hardened and hardened as the ring-shaped member has been described. However, the inner ring of the bearing may be hardened and hardened as the ring-shaped member. In this case, the coil is preferably disposed on the inner peripheral side of the inner ring. That is, when the bearing ring is quenched and hardened, it is preferable to install a coil on the circumferential surface side opposite to the rolling surface. This is because the rolling surface side is processed into a shape that matches the shape of the rolling element, while the peripheral surface opposite to the rolling surface often has a relatively simple shape. Therefore, when it is assumed that the entire ring-shaped member (ring race) is hardened and cured, stable heating is facilitated. In addition, from the viewpoint of ensuring uniform heating of the race, the coil may be disposed on the rolling surface side. Further, the ring-shaped member to be heat-treated in the heat-treating facility for the ring-shaped member of the present invention is not limited to the bearing ring, and heat-treating (quenching hardening) a member required to achieve high hardness by quench hardening. can do.

  In the above embodiment, the case where the outer ring 90 rotates in the circumferential direction when the outer ring 90 is heated has been described. However, the outer ring 90 may be fixed, and the coil may rotate along the outer periphery of the outer ring 90. Both the outer ring 90 and the coil may rotate.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The heat treatment equipment for a ring-shaped member of the present invention can be particularly advantageously applied to a heat treatment equipment for a ring-shaped member that is required to improve the production efficiency of a product while employing high-frequency induction heating.

  DESCRIPTION OF SYMBOLS 1 Induction hardening equipment, 11 Heating coil (Soaking coil), 12 Support arm, 13 Preheating coil, 21 Radiation thermometer, 31 Loading conveyor, 41 Cooling conveyor, 51 Holding part, 60 Coolant tank, 61 Cooling liquid 62, partition wall, 71 holding arm, 72 discharge conveyor, 90 outer ring.

Claims (8)

A heat treatment facility for a ring-shaped member for quenching a ring-shaped member made of steel,
A heating section for inductively heating the ring-shaped member;
A holding portion for holding the ring-shaped member;
A cooling unit that quenches and cures the ring-shaped member by cooling the ring-shaped member that has been induction-heated,
The heating unit includes a plurality of coils arranged along the peripheral surface so as to face a part of the peripheral surface of the ring-shaped member, and movable in a radial direction of the ring-shaped member,
The said holding | maintenance part is the heat processing equipment of a ring-shaped member which hold | maintains so that the said surrounding surface may face the said coil in the state which arranged the said ring-shaped member in the axial direction.   The ring according to claim 1, wherein the region of the coil to be opposed to the peripheral surface of the ring-shaped member has an arc shape in a cross section perpendicular to the axis of the ring-shaped member to be heated. -Like heat treatment equipment.   The region of the coil to be opposed to the peripheral surface of the ring-shaped member has a radius of curvature equal to or greater than the radius of curvature of the peripheral surface to be opposed in a cross section perpendicular to the axis of the ring-shaped member to be heated. The ring-shaped member heat treatment facility according to claim 2.   The plurality of coils are arranged to face a region of 10% to 50% with respect to the entire circumference of the peripheral surface in a cross section perpendicular to the axis of the ring-shaped member to be heated. The heat processing equipment of the ring-shaped member of any one of 1-3.   The heat treatment equipment for a ring-shaped member according to any one of claims 1 to 4, wherein the coil is rotatable relative to the ring-shaped member along a circumferential direction of the ring-shaped member. .   The heat treatment equipment for a ring-shaped member according to any one of claims 1 to 5, further comprising a radiation thermometer for measuring the temperature of the ring-shaped member during induction heating.   The heat treatment equipment for a ring-shaped member according to any one of claims 1 to 6, further comprising a transport unit that transports the ring-shaped member that has been induction-heated in the heating unit to the cooling unit.   The said ring-shaped member is the heat processing equipment of the ring-shaped member of any one of Claims 1-7 which is a bearing ring of a rolling bearing.

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