JP2008274363A - Method and apparatus for hardening peripheral surface of material to be hardened - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for hardening a peripheral surface of a material to be hardened which dispense with manufacture of an exclusive heating and cooling source for each large material to be hardened and can prevent the occurrence of non-hardened layer or hardening crack caused by tempering of a portion already formed with the quench hardened layer in the material to be hardened, and achieve improvement in the strength. <P>SOLUTION: The peripheral surface 2 of the material 1 to be hardened is hardened by: setting the peripheral directional necessary position on the outer peripheral surface 2 in the material 1 to be hardened as the starting point S; setting the peripheral directional necessary position on the outer peripheral surface 2 of the material 1 to be hardened, separated from the starting point S as a completing point E; moving one side of one pair of dividable heating and cooling sources 3A and 3B for hardening toward the completing point E from the starting point S along one side of course copying the outer peripheral surface 2 of the material 1 to be hardened and at the same time moving the other side of the heating and cooling sources 3A and 3B along the other course copying the outer peripheral surface 2 of the material 1 to be hardened from the starting point S toward the completing point E; and unifying the heating and cooling sources 3A and 3B at the completing point E. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a peripheral quenching method and apparatus for an object to be quenched.

  Conventionally, for example, as shown in FIG. 5 (a), when the outer peripheral surface 2 of the object 1 to be hardened, such as a large cam, is to be quenched, the periphery of the outer peripheral surface 2 that is the target of the object 1 to be hardened. The induction heating coil 3 is arranged as a heating source so as to maintain a required interval with respect to a part in the direction, and the induction heating coil 3 or the induction heating coil 3 is supplied while supplying a high frequency current from a high frequency power source (not shown). A method in which one of the objects to be quenched 1 is fixed, the other is rotated, and the outer peripheral surface 2 of the objects to be quenched 1 is sequentially heated by induction heating (so-called plane transfer firing). On). In addition, the to-be-quenched thing 1 after the said heating performs quenching process by spraying the cooling water etc. which are supplied from the cooling water apparatus which is not shown in figure from an injection nozzle as needed. It has come to be.

  Incidentally, as shown in FIG. 5 (b), the object 1 to be hardened such as a small and medium-sized cam is used as a heating source formed in a ring shape so as to follow the outer peripheral surface 2 of the object 1 to be hardened. In the state where the induction heating coil 3 is arranged and both the induction heating coil 3 and the object to be hardened 1 are fixed, a high frequency current is supplied to the induction heating coil 3 from a high frequency power source (not shown) to be hardened. A method of quenching by soaking the outer peripheral surface 2 of the object 1 at a time (a so-called stationary single quenching) is performed, or, as shown in FIG. An induction heating coil 3 as a heating source formed in a ring shape so as to follow the outer peripheral surface 2 is arranged, and a high frequency current is supplied to the induction heating coil 3 from a high frequency power source (not shown), and the induction heating coil 3 3 or the object to be hardened 1 is fixed and the other is moved up and down By induction heating sequentially continuous outer circumferential surface 2 of the baked batch 1 direction, a method of quench (so-called vertical movement quenching) is sometimes performed.

For example, Patent Document 1 shows a general technical level related to the above-described plane transfer quenching.
JP 58-28333 A

  However, in the planar moving quenching method in the circumferential direction of the workpiece 1 as described above, after the heating by the induction heating coil 3 is started, the quenching of the outer peripheral surface 2 to be quenched is completed after one rotation. Since the induction heating coil 3 is configured to circulate and return to the heating start point, the induction heating coil 3 is already quenched near the heating start point when the induction heating coil 3 circulates and returns while the high frequency current is supplied to the heating start point. The portion where the hardened layer is formed becomes “tempered” by the heat of the induction heating coil 3 that has returned to circulation, and may be softened to become a weak point in strength or cause cracking.

  In order to prevent such a problem from occurring, it is conceivable to take a wide space between the heating start point and the heating end point, but in this case, the heating start point and the heating end point are not quenched, It was inevitable that a so-called soft zone (uncured layer) in which a hardened layer was not formed could be widened, and that part would also be a weak point in strength. Incidentally, in the case of the object to be hardened 1 such as a small and medium-sized cam, the soft zone is set by the above-mentioned fixed one-time quenching (see FIG. 5B) or the vertical movement quenching (see FIG. 5C). Although it is possible to eliminate, especially for the large-sized to-be-quenched object 1, it is necessary to produce a dedicated large-sized coil as a heating source, a large-capacity high-frequency power source, etc., and it is difficult to apply because it is not profitable.

  In addition, as shown in FIG. 6, by forming a soft zone on the outer peripheral surface 2 of the to-be-quenched object 1 at an angle, when the rolling member 4 such as a cam follower comes into contact with the soft zone, Although measures have been taken to reduce the burden in the soft zone and reduce friction by making sure to contact the hardened layer as well, it has not been a fundamental solution.

  In view of such circumstances, the present invention is based on tempering of a portion where a hardened and hardened layer of the object to be hardened is already formed without producing a dedicated heating and cooling source for each large object to be hardened. An object of the present invention is to provide a method and an apparatus for quenching the peripheral surface of an object to be hardened which can prevent the occurrence of an uncured layer or a crack and can improve the strength.

The present invention sets a circumferential required place on the peripheral surface of the object to be hardened as a starting point,
Set the required position in the circumferential direction on the peripheral surface of the material to be hardened away from the start point as the end point,
While moving one of a pair of separable heating / cooling sources for quenching from the start point to the end point along one path following the peripheral surface of the workpiece, the other of the heating / cooling sources is moved. By moving along the other path following the peripheral surface of the object to be hardened from the start point to the end point, the heating and cooling source is integrated at the end point, thereby quenching the peripheral surface of the material to be hardened. The present invention relates to a circumferential quenching method for a workpiece to be hardened.

In addition, the present invention sets the circumferential required place on the peripheral surface of the object to be hardened as a starting point,
Set the required position in the circumferential direction on the peripheral surface of the material to be hardened away from the start point as the end point,
In a state where one of a pair of separable heating / cooling sources for quenching is fixed at a position facing the starting point, the workpiece is rotated so that its peripheral surface moving speed becomes V, While moving one of the heating / cooling sources from the start point to the end point relatively along one path following the peripheral surface of the workpiece, the other of the heating / cooling source is moved from the start point to the end point. Move along the other path following the peripheral surface of the object to be hardened at a moving speed of 2 V that is twice the peripheral surface moving speed of the object to be hardened, and integrate the heating and cooling source at the end point. Thus, the peripheral surface quenching method of the object to be hardened is characterized by quenching the peripheral surface of the object to be hardened.

Furthermore, the present invention divides the circumferential surface of the object to be hardened into a plurality of circumferential directions,
Set both ends of the divided peripheral surface as starting points,
Set a required portion in the circumferential intermediate portion on the divided peripheral surface of the material to be hardened away from each start point as an end point,
For each of the divided peripheral surfaces, move a pair of separable heating / cooling sources for quenching from a start point at both ends of the divided peripheral surface to a corresponding end point along a path following the divided peripheral surface, The present invention relates to a method for quenching the peripheral surface of an object to be hardened, wherein the peripheral surface of the object to be quenched is hardened by integrating the heating and cooling source at the end point.

On the other hand, the present invention comprises a pair of separable heating and cooling sources for peripheral quenching of the object to be quenched,
One of the pair of heating / cooling sources is set to a required position in the circumferential direction on the peripheral surface of the object to be hardened away from the start point set at a required position in the peripheral direction on the peripheral surface of the object to be hardened. The workpiece is moved along one path following the peripheral surface of the object to be hardened toward the finished point, and at the same time, the other of the pair of heating and cooling sources for hardening is hardened from the start point to the end point. And a moving means for integrating the heating and cooling source at the end point. is there.

The present invention also includes a pair of separable heating / cooling sources for quenching the peripheral surface of the workpiece,
In a state where one of the pair of heating and cooling sources is fixed at a position facing a starting point set in a circumferential direction required place on the peripheral surface of the object to be quenched, the peripheral surface moving speed is V and The one of the pair of heating and cooling sources is quenched from the start point toward the end point set in the circumferential direction on the peripheral surface of the object to be hardened away from the start point. While moving relatively along one path that follows the peripheral surface of the object, the other of the pair of heating and cooling sources for quenching that follows the peripheral surface of the object to be hardened from the start point to the end point And a moving means for moving the heating / cooling source integrally at the end point. It is applied to the peripheral surface quenching apparatus.

Furthermore, the present invention provides a plurality of pairs of heating / cooling sources each of which can be divided for quenching and arranged for each divided peripheral surface obtained by dividing the peripheral surface of the object to be hardened into a plurality of circumferential directions thereof,
Each of the plurality of pairs of heating / cooling sources is set for each of the divided peripheral surfaces at a required position in the middle in the circumferential direction on the divided peripheral surface separated from the start point from the start points set at both ends of the divided peripheral surface. And a moving means for moving the heating / cooling source together at the end point to move to a finish point along the path following the divided peripheral surface. It depends on.

  According to the above means, the following operation can be obtained.

  When configured as described above, unlike the conventional plane transfer quenching method in the circumferential direction of the object to be hardened, the portion where the hardened layer is already hardened near the start point is “tempered”. No need to worry about strength reduction due to softening or quench cracking, and even for large objects to be hardened, it is necessary to produce a dedicated large coil as a heating source or provide a large-capacity high-frequency power supply. Because there is no, there is no worry that it will not be profitable.

  According to the method and apparatus for circumferential quenching of the object to be hardened according to the present invention, an already quenched and hardened layer of the object to be hardened without producing a dedicated heating / cooling source for each large object to be hardened. It is possible to prevent the occurrence of an uncured layer or burning cracks due to tempering of the portion where the is formed, and to achieve an excellent effect that the strength can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first example of an embodiment of the present invention, in which a circumferential required place on the outer peripheral surface 2 of the object 1 to be hardened such as a large cam is set as a starting point S.
A required portion in the circumferential direction on the outer peripheral surface 2 of the workpiece 1 separated from the starting point S (in the example of FIG. 1, the axis 180 from the starting point S about the axis O of the workpiece 1 such as the cam). Set the phase shift point) as the end point E,
One path following the outer peripheral surface 2 of the workpiece 1 from the start point S to the end point E (one of the pair of heat-cooling sources 3A and 3B that can be divided for quenching (heat-cooling source 3A)) (see FIG. In the example of FIG. 1, the heating / cooling sources 3 </ b> A and 3 </ b> B (the heating / cooling source 3 </ b> B) is moved from the start point S to the end point E at the same time as moving along the axis O along the clockwise route. And moving along the other path following the outer peripheral surface 2 of the object to be hardened 1 (in the example of FIG. 1, a path that is counterclockwise about the axis O), and the heating and cooling sources 3A, 3B Is integrated at the end point E so that the outer peripheral surface 2 of the object to be hardened 1 is quenched.

  In the case of the illustrated example, the heating and cooling sources 3A and 3B are connected to a high frequency power source 5 and an induction heating coil 6 to which a high frequency current is supplied from the high frequency power source 5 and a cooling water device 7 as shown in FIG. An injection nozzle 8 that is connected and can inject cooling water or the like supplied from the cooling water device 7 onto the outer peripheral surface 2 of the object to be quenched 1, and the outer peripheral surface of the object to be quenched 1 by the operation of the moving means 9. It can be moved along a path following 2.

  The moving means 9 for moving the heating / cooling sources 3A and 3B along the path following the outer peripheral surface 2 of the object to be hardened 1 is connected to the multi-axis robot controller 10 as shown in FIG. A base unit 11 disposed so as to be movable along a table or a rail that is not mounted, and a robot arm 12 pivotally attached to the base unit 11. The heating and cooling sources 3A, 3A, 3B is attached. In FIG. 2, reference numeral 13 denotes a table on which the object to be hardened 1 is placed.

  Next, the operation of the illustrated example will be described.

  If comprised as mentioned above, first, a pair of separable heating / cooling sources 3A, 3B for quenching are integrated at the starting point S on the outer peripheral surface 2 of the object to be hardened 1 as shown by the solid line in FIG. From the state, a high frequency current is supplied to the induction heating coil 6 from the high frequency power source 5, the outer peripheral surface 2 of the object to be quenched 1 is heated, and the cooling water supplied from the cooling water device 7 is spray nozzles as necessary. 8 is injected onto the outer peripheral surface 2 of the object 1 to be hardened, and quenching at the start point S is performed.

  Subsequently, one of the heating / cooling sources 3A and 3B (heating / cooling source 3A) attached to the tip of the robot arm 12 of the moving means 9 is moved from the start point S by the movement of the base unit 11 and the bending operation of the robot arm 12. It moves along one path (in the example of FIG. 1, a clockwise path around the axis O in the example of FIG. 1) following the outer peripheral surface 2 of the workpiece 1 toward the end point E. The outer peripheral surface 2 of the object to be quenched 1 is quenched in one path from the start point S to the end point E by heating and cooling, and at the same time, the other of the heating and cooling sources 3A and 3B (heating and cooling source 3B) ) Is the other path (in the example of FIG. 1, the axis in the example of FIG. 1) that moves from the start point S to the end point E by the movement of the base unit 11 and the bending movement of the robot arm 12. Centered around the heart O and counterclockwise Continue to move along the path), quenching of the outer peripheral surface 2 of the baked container 1 is performed in the other path toward the end point E from the start point S by the same heating and cooling as described above.

  Finally, the heating and cooling sources 3A and 3B are united at the end point E, and quenching is performed at the end point E by the same heating and cooling as described above. Quenching of the entire surface 2 is complete.

  As a result, unlike the conventional plane transfer quenching method (refer to FIG. 5A) in the circumferential direction of the workpiece 1 to be hardened, the hardened layer is already formed in the vicinity of the starting point S. The part is no longer “tempered”, and there is no fear of strength reduction or cracking due to softening.

  In addition, even for a large object 1 to be hardened, there is no need to manufacture a dedicated large coil as a heating source or to provide a large-capacity high-frequency power source, etc.

  Thus, an uncured layer formed by tempering a portion of the material to be hardened 1 which has already been hardened and hardened without producing dedicated heating and cooling sources 3A and 3B for each large material to be hardened 1 Or generation | occurrence | production of a burning crack can be prevented and intensity | strength improvement can be aimed at.

  FIG. 3 is a second example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same components, and the basic configuration is shown in FIGS. 2 is the same as that shown in FIG. 2, but the feature of this example is that one of a pair of heating and cooling sources 3A and 3B that can be divided for quenching (heating and cooling source 3A) is used as shown in FIG. In a state where it is fixed at a position facing the start point S, the workpiece 1 is rotated so that its peripheral surface moving speed is V (in the example of FIG. 3, it is rotated in a counterclockwise direction). Thus, one of the heating / cooling sources 3A and 3B (heating / cooling source 3A) is moved from the start point S to the end point E along the peripheral surface of the workpiece 1 (in the example of FIG. At the same time, the heating / cooling source 3A, The other path of B (heating / cooling source 3B) from the start point S to the end point E, following the peripheral surface of the object to be quenched 1 (in the example of FIG. 3, counterclockwise around the axis O) By moving the heating / cooling sources 3A and 3B together at the end point E by moving at a moving speed 2V that is twice the peripheral surface moving speed of the object 1 to be hardened. It exists in the point comprised so that the surrounding surface of the thing 1 might be hardened.

  In the case of this illustrated example, the table 13 on which the object to be hardened 1 shown in FIG.

  If comprised as mentioned above, first, a pair of separable heating / cooling sources 3A, 3B for quenching are integrated at the starting point S on the outer peripheral surface 2 of the object to be hardened 1 as shown by the solid line in FIG. 2, a high frequency current is supplied from the high frequency power source 5 to the induction heating coil 6 shown in FIG. 2, the outer peripheral surface 2 of the object to be quenched 1 is heated, and cooling water supplied from the cooling water device 7 as necessary. Etc. are injected from the injection nozzle 8 onto the outer peripheral surface 2 of the object 1 to be hardened, and quenching at the starting point S is performed.

  Subsequently, one of the heating / cooling sources 3A and 3B (heating / cooling source 3A) attached to the tip of the robot arm 12 of the moving means 9 is fixed at a position facing the start point S, and the table 13 is rotated. When the workpiece 1 is rotated so that the peripheral surface moving speed is V by driving (in the example of FIG. 3, it is rotated counterclockwise), the heating / cooling source 3A is moved to the start point S. It moves relatively along the one path (in the example of FIG. 3, a path that is clockwise relative to the axis O in the example of FIG. 3) toward the end point E. The outer peripheral surface 2 of the object to be quenched 1 is relatively quenched in one path from the start point S to the end point E by heating and cooling similar to the above, and at the same time, the heating and cooling source 3A , 3B (heating / cooling source 3B) is a base unit 1 and the other arm following the outer peripheral surface 2 of the workpiece 1 from the start point S to the end point E by the movement of the robot arm 12 and the bending operation of the robot arm 12 (in the example of FIG. A counterclockwise path) is moved at a moving speed 2V that is twice the peripheral surface moving speed of the object 1 to be hardened, and from the start point S to the end point E by the same heating and cooling as described above. Quenching of the outer peripheral surface 2 of the object to be hardened 1 in the other path is performed. The heating / cooling source 3A is fixed at a position opposite to the initial starting point S of the object to be hardened 1, so that the base unit 11 is not moved, but from the axis O like a cam or the like. In the case of the to-be-quenched object 1 having different diameters depending on the circumferential position, the heating / cooling source 3A follows the change in the diameter accompanying the rotation of the to-be-quenched object 1 and the robot arm 12 is bent. The workpiece 1 moves in the radial direction, and the distance between the heating / cooling source 3A and the peripheral surface of the workpiece 1 is kept constant.

  Finally, when the end point E of the object to be hardened 1 reaches the position of the heating / cooling source 3A, the heating / cooling sources 3A, 3B are integrated at the end point E, and in this state, the same as described above By heating and cooling, quenching at the end point E is performed, and quenching of the entire outer peripheral surface 2 of the workpiece 1 is completed.

  As a result, in the case of the example shown in FIG. 3, as in the case of the example shown in FIG. 1, the conventional planar moving quenching method (see FIG. 5A) in the circumferential direction of the object to be quenched 1. In contrast, the portion that has already been hardened and formed with a hardened layer in the vicinity of the start point S is no longer tempered, and there is no concern about strength reduction or cracking due to softening. Even if it is 1, there is no need to produce a large dedicated coil as a heating source or to provide a large-capacity high-frequency power source or the like, so there is no concern that it will not be profitable.

  Thus, in the case of the example shown in FIG. 3, as in the case of the example shown in FIG. 1, the to-be-quenched object 1 can be obtained without producing dedicated heating / cooling sources 3 </ b> A and 3 </ b> B for each large-sized to-be-quenched object 1. It is possible to prevent the occurrence of an uncured layer or tempering cracks due to tempering in the portion where the hardened and hardened layer is already formed, and to improve the strength.

FIG. 4 shows a third example of the embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same components, and the basic configuration is shown in FIGS. 2 is the same as that shown in FIG. 2, but the feature of this example is that, as shown in FIG. 4, the outer peripheral surface 2 of the workpiece 1 is divided into a plurality of parts in the circumferential direction (in the example of FIG. 4, it is divided into two parts). ) And
Both ends of the divided outer peripheral surfaces 2A1 and 2A2 are set as start points S1 and S2 (in the example of FIG. 4, points that are 180 ° out of phase with respect to the axis O of the object 1 to be hardened such as the cam). ,
Necessary locations in the circumferential direction in the divided outer peripheral surfaces 2A1 and 2A2 of the workpiece 1 separated from the respective start points S1 and S2 are end points E1 and E2 (in the example of FIG. Set as a point 90 ° out of phase from the start points S1, S2)
On the divided outer peripheral surface 2A1 side, a pair of separable heating / cooling sources 3A1 and 3B1 for quenching are formed on the divided outer peripheral surface 2A1 from the start points S1 and S2 at both ends of the divided outer peripheral surface 2A1 toward the corresponding end points E1. At the same time, the heating / cooling sources 3A1, 3B1 are integrated at the end point E1.
On the divided outer peripheral surface 2A2 side, a pair of heat-cooling sources 3A2 and 3B2 that can be divided for quenching are moved from the start points S1 and S2 at both ends of the divided outer peripheral surface 2A2 toward the corresponding end points E2 to the divided outer peripheral surface 2A2. By moving along the path to be copied and integrating the heating and cooling sources 3A2 and 3B2 at the end point E2, the outer peripheral surface 2 of the object to be quenched 1 is hardened.

  The heating / cooling sources 3A1, 3B1 and the heating / cooling sources 3A2, 3B2 are connected to a high-frequency power source 5 and supplied with a high-frequency current from the high-frequency power source 5 as shown in FIG. The moving unit 9 includes an induction heating coil 6 and an injection nozzle 8 connected to the cooling water device 7 and capable of injecting cooling water or the like supplied from the cooling water device 7 onto the outer peripheral surface 2 of the object to be quenched 1. It may be attached to the tip of the robot arm 12.

  When configured as described above, first, the heating / cooling sources 3A1 and 3A2 are integrated at the starting point S1 on the divided outer peripheral surfaces 2A1 and 2A2 of the object to be hardened 1 as shown by the solid line in FIG. A high-frequency current is supplied from the high-frequency power source 5 to the induction heating coil 6 shown in FIG. 2 to heat the divided outer peripheral surfaces 2A1 and 2A2 of the object to be hardened 1, and the cooling water supplied from the cooling water device 7 is jetted as necessary. The nozzle 8 is sprayed onto the divided outer peripheral surfaces 2A1 and 2A2 of the object 1 to be hardened, quenching is performed at the start point S1, and the heating and cooling sources 3B1 and 3B2 are hardened as shown by the solid lines in FIG. A high frequency current is supplied from a high frequency power source 5 to the induction heating coil 6 shown in FIG. 2 from a state where the divided peripheral surfaces 2A1, 2A2 are integrated at the starting point S2, and the divided outer peripheral surface 2A1, 2A2 is heated and must Cooling water or the like supplied from a cooling water system 7 is injected from the injection nozzle 8 to divide the outer peripheral surface 2A1,2A2 of the baked batch 1, quenching is performed at the start point S2, depending on.

  Subsequently, one of the heating / cooling sources 3A1 and 3B1 (heating / cooling source 3A1) attached to the tip of the robot arm 12 of the moving means 9 is moved from the start point S1 by the movement of the base unit 11 and the bending operation of the robot arm 12. It moves along one path (in the example of FIG. 4, a clockwise path around the axis O in the example of FIG. 4) following the divided outer peripheral surface 2A1 of the workpiece 1 toward the end point E1. By the same heating and cooling, the divided outer peripheral surface 2A1 of the object to be quenched 1 is quenched in one path from the start point S1 to the end point E1, and at the same time, the other of the heating and cooling sources 3A1 and 3B1 (heating and cooling). The source 3B1) is the other path following the divided outer peripheral surface 2A1 of the workpiece 1 from the start point S2 to the end point E1 by the movement of the base unit 11 and the bending operation of the robot arm 12 (see FIG. In the example of FIG. 4, the workpiece is moved along a path that is counterclockwise around the axis O, and is hardened in the other path from the start point S2 to the end point E1 by the same heating and cooling as described above. Quenching of the divided outer peripheral surface 2A1 of the object 1 is performed.

  One of the heating / cooling sources 3A2 and 3B2 (heating / cooling source 3A2) attached to the tip of the robot arm 12 of the moving means 9 ends from the start point S1 due to the movement of the base unit 11 and the bending operation of the robot arm 12. It moves along one path following the divided outer peripheral surface 2A2 of the object to be hardened 1 toward the point E2 (in the example of FIG. 4, a path that is counterclockwise about the axis O), and By the same heating and cooling, the divided outer peripheral surface 2A2 of the object to be quenched 1 is quenched in one path from the start point S1 to the end point E2, and at the same time, the other of the heating and cooling sources 3A2 and 3B2 (heating and cooling). The source 3B2) is the other path (FIG. 4) that follows the divided outer peripheral surface 2A2 of the workpiece 1 from the start point S2 to the end point E2 by the movement of the base unit 11 and the bending operation of the robot arm 12. In the example, the object to be hardened 1 in the other path from the start point S2 to the end point E2 by heating and cooling in the same manner as described above. Quenching of the divided outer peripheral surface 2A2 is performed.

  Finally, the heating and cooling sources 3A1 and 3B1 are integrated at the end point E1, and quenching is performed at the end point E1 by the same heating and cooling as described above. While quenching of the entire outer peripheral surface 2A1 is completed, the heating and cooling sources 3A2 and 3B2 are integrated at the end point E2, and quenching is performed at the end point E2 by the same heating and cooling as described above. Quenching of the entire divided outer peripheral surface 2A2 of the quenched product 1 is completed.

  As a result, in the case of the example shown in FIG. 4, unlike the conventional planar moving quenching method (see FIG. 5A) in the circumferential direction of the workpiece 1, the vicinity of the start points S 1 and S 2 has already been obtained. The portion where the hardened layer is formed by quenching is no longer “tempered”, and there is no risk of strength reduction or cracking due to softening. There is no need to manufacture a large dedicated coil or provide a large-capacity high-frequency power supply, so there is no concern that it will not be profitable.

  Further, in the case of the example shown in FIG. 4, it is possible to shorten the quenching time of the entire outer peripheral surface 2 of the workpiece 1 as compared with the case of the example shown in FIG. 1.

  Thus, in the case of the example shown in FIG. 4, as in the case of the example shown in FIG. 1, the to-be-quenched object 1 can be obtained without producing dedicated heating / cooling sources 3 </ b> A and 3 </ b> B for each large-sized to-be-quenched object 1. It is possible to prevent the occurrence of an uncured layer or tempering cracks due to tempering in the portion where the hardened and hardened layer is already formed, and to improve the strength.

  The method and apparatus for quenching the peripheral surface of the object to be hardened according to the present invention is not limited to the above-described example, and the outer peripheral surface of the cam as the object to be hardened is divided into three in the circumferential direction. It is possible to divide more than that, and it can be applied not only to cams but also to gears and wheels, and also to not only the outer peripheral surface of cams but also the inner peripheral surface of ring-shaped members, etc. Applicable and not limited to high frequency induction heating, it is also possible to employ heating by a laser or an electron beam, and as a quenching process, cooling after heating is slow depending on the material of the object to be quenched. However, since it may be possible, cooling with water or the like may not be necessary. Liquid cooling other than water (for example, oil, polymer solution, etc.) or gas cooling (for example, air, nitrogen, helium, carbon dioxide) , Hydrogen, etc.) are also possible, etc. It is needless to say that various changes and modifications may be made without departing from the scope and.

It is a schematic plan view which shows the 1st example of the form which implements this invention. It is a perspective view which shows the apparatus structure in the 1st example of embodiment which implements this invention. It is a schematic plan view which shows the 2nd example of the form which implements this invention. It is a schematic plan view which shows the 3rd example of the form which implements this invention. It is a perspective view which shows the various quenching methods of the to-be-hardened thing in the past, (a) is a figure which shows plane transfer quenching, (b) is a figure which shows stationary one-time quenching, (c) is longitudinal movement It is a figure which shows quenching. It is a side view which shows the example which dared and formed the soft zone in the outer peripheral surface of to-be-quenched thing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hardened object 2 Outer peripheral surface 2A1 Divided outer peripheral surface 2A2 Divided outer peripheral surface 3A Heating / cooling source 3A1 Heating / cooling source 3A2 Heating / cooling source 3B Heating / cooling source 3B1 Heating / cooling source 3B2 Heating / cooling source 5 High frequency power source 6 Induction heating coil 7 Cooling water Device 8 Injection nozzle 9 Moving means 10 Multi-axis robot controller 11 Base unit 12 Robot arm S Start point S1 Start point S2 Start point E End point E1 End point E2 End point

Claims (6)

Set the required position in the circumferential direction on the peripheral surface of the material to be hardened as the starting point,
Set the required position in the circumferential direction on the peripheral surface of the material to be hardened away from the start point as the end point,
While moving one of a pair of separable heating / cooling sources for quenching from the start point to the end point along one path following the peripheral surface of the workpiece, the other of the heating / cooling sources is moved. By moving along the other path following the peripheral surface of the object to be hardened from the start point to the end point, the heating and cooling source is integrated at the end point, thereby quenching the peripheral surface of the material to be hardened. A method for quenching the peripheral surface of the object to be hardened. Set the required position in the circumferential direction on the peripheral surface of the material to be hardened as the starting point,
Set the required position in the circumferential direction on the peripheral surface of the material to be hardened away from the start point as the end point,
In a state where one of a pair of separable heating / cooling sources for quenching is fixed at a position facing the starting point, the workpiece is rotated so that its peripheral surface moving speed becomes V, While moving one of the heating / cooling sources from the start point to the end point relatively along one path following the peripheral surface of the workpiece, the other of the heating / cooling source is moved from the start point to the end point. Move along the other path following the peripheral surface of the object to be hardened at a moving speed of 2 V that is twice the peripheral surface moving speed of the object to be hardened, and integrate the heating and cooling source at the end point. The method of quenching the peripheral surface of the object to be hardened is characterized by quenching the peripheral surface of the object to be quenched. Divide the peripheral surface of the object to be hardened into multiple parts in the circumferential direction,
Set both ends of the divided peripheral surface as starting points,
Set a required portion in the circumferential intermediate portion on the divided peripheral surface of the material to be hardened away from each start point as an end point,
For each of the divided peripheral surfaces, move a pair of separable heating / cooling sources for quenching from a start point at both ends of the divided peripheral surface to a corresponding end point along a path following the divided peripheral surface, A peripheral surface quenching method for a quenching object, wherein the peripheral surface of the quenching object is quenched by integrating the heating and cooling source at an end point. A pair of separable heating and cooling sources for quenching the periphery of the workpiece;
One of the pair of heating / cooling sources is set to a required position in the circumferential direction on the peripheral surface of the object to be hardened away from the start point set at a required position in the peripheral direction on the peripheral surface of the object to be hardened. The workpiece is moved along one path following the peripheral surface of the object to be hardened toward the finished point, and at the same time, the other of the pair of heating and cooling sources for hardening is hardened from the start point to the end point. And a moving means that moves the heating / cooling source along the other path following the peripheral surface, and integrates the heating / cooling source at an end point. A pair of separable heating and cooling sources for quenching the periphery of the workpiece;
In a state where one of the pair of heating and cooling sources is fixed at a position facing a starting point set in a circumferential direction required place on the peripheral surface of the object to be quenched, the peripheral surface moving speed is V and The one of the pair of heating and cooling sources is quenched from the start point toward the end point set in the circumferential direction on the peripheral surface of the object to be hardened away from the start point. While moving relatively along one path that follows the peripheral surface of the object, the other of the pair of heating and cooling sources for quenching that follows the peripheral surface of the object to be hardened from the start point to the end point And a moving means for moving the heating / cooling source integrally at the end point. Peripheral quenching equipment. A plurality of pairs of heating and cooling sources that can be divided for quenching and arranged for each divided peripheral surface obtained by dividing the peripheral surface of the object to be hardened into a plurality of circumferential directions,
Each of the plurality of pairs of heating / cooling sources is set for each of the divided peripheral surfaces at a required position in the middle in the circumferential direction on the divided peripheral surface separated from the start point from the start points set at both ends of the divided peripheral surface. And a moving means for moving the heating / cooling source together at the end point to move to a finish point along the path following the divided peripheral surface. .

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