JP2007092088A - Heat treatment apparatus and heat treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat treatment apparatus which has good productivity and can uniformly cool a material for applying the heat treatment. <P>SOLUTION: This heat treatment apparatus is provided with a driving means for rotating the material for applying the heat treatment raised to a quenching temperature, and a cooling means 100 for cooling the material for applying the heat treatment during rotating. The material for applying the heat treatment has projecting and recessing parts in the peripheral direction, and the projecting and recessing parts have the front face side and the back surface side, regarding to the rotating direction of the material for applying the heat treatment. The cooling means 100 has the first and the second nozzles 172, 177 for injecting cooling medium for cooling the front face side and the back surface side. The directions of the first and the second nozzles 172, 177 are set so as to reduce the difference between the cooling rates at the front face side and the back surface side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat treatment apparatus and a heat treatment method.

In a state where the heat treatment material is rotated, the temperature is raised by high frequency induction heating, and then the rotation is stopped, and the quenching is performed by ejecting a cooling liquid to lower the temperature (for example, Patent Document 1). reference.).
JP-A-6-122926

  However, although it is possible to cool the heat-treated material uniformly, there is a problem in productivity because the cycle time becomes long.

  The present invention has been made to solve the problems associated with the above-described prior art, and provides a heat treatment apparatus and a heat treatment method that have good productivity and can uniformly cool a material to be heat treated. With the goal.

In order to achieve the above object, the invention described in claim 1
First driving means for rotating the material to be heat-treated at the quenching temperature; and
A cooling means for cooling the heat treated material in rotation;
The heat-treated material has a concavo-convex portion in a circumferential direction, and the concavo-convex portion has a front side and a back side with respect to a rotation direction of the heat-treated material,
The cooling means includes first and second nozzles for injecting a cooling medium for cooling the front surface side and the back surface side,
In the heat treatment apparatus, the directions of the first and second nozzles are set so as to reduce a difference between the cooling rate on the front side and the cooling rate on the back side.

In order to achieve the above object, the invention according to claim 17 provides:
Having a cooling step for cooling the heat-treated material heated to the quenching temperature while being rotated by the first driving means;
The heat-treated material has a concavo-convex portion in a circumferential direction, and the concavo-convex portion has a front side and a back side with respect to a rotation direction of the heat-treated material,
The front side and the rear side are cooled by a cooling medium sprayed from the first and second nozzles, respectively.
The directions of the first and second nozzles are set so as to reduce the difference between the cooling rate on the front side and the cooling rate on the back side.

  According to the invention described in claim 1, based on the orientation of the first and second nozzles, it is possible to reduce the difference between the cooling rate on the surface side of the heat-treated material and the cooling rate on the back side, Cooling unevenness can be suppressed. In addition, since the material to be heat-treated is cooled in a rotated state, it is possible to suppress an increase in cycle time. Therefore, it is possible to provide a heat treatment apparatus that has good productivity and can uniformly cool the material to be heat treated.

  According to the invention described in claim 17, when the material to be heat-treated is rotated based on the orientations of the first and second nozzles, the cooling rate on the surface side and the cooling rate on the back side of the material to be heat-treated The difference is reduced and cooling unevenness is suppressed. Moreover, since the material to be heat-treated is cooled in a rotated state, the cycle time is prevented from being extended. Therefore, it is possible to provide a heat treatment method that has good productivity and can uniformly cool the material to be heat treated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view for explaining a workpiece according to Embodiment 1, and FIG. 2 is a side view of the workpiece shown in FIG.

  The workpiece (material to be heat-treated) 10 is a connecting rod having a concavo-convex portion in the circumferential direction, and is used to connect a piston and a crankshaft in an internal combustion engine and transmit the reciprocating motion of the piston to the crankshaft. Is done.

  The workpiece 10 includes a connecting portion 14 forming a main body, a large end portion 11 located on one end side of the connecting portion 14, and a small end portion 16 located on the other end side of the connecting portion 14. The connecting portion 14 has substantially the same cross-sectional shape and has an I-shaped cross section.

  The large end portion 11 is a split type, has a semicircular portion 12, and is connected to a pin of a crankshaft by combining a connecting rod cap using, for example, a bolt. The small end portion 16 has an opening 17 for connecting the piston pin.

  Connecting portions 13 and 15 are formed between the large end portion 11 and the connecting portion 14 and between the connecting portion 14 and the small end portion 16. The cross-sectional areas of the connecting portions 13 and 15 continuously decrease toward the connecting portion 14. The connecting portion 14 is a reduced diameter portion, and the large end portion 11, the connecting portions 13 and 15, and the small end portion 16 are enlarged diameter portions extending from both ends of the connecting portion 14.

  The manufacturing method of the workpiece 10 includes a forging process, a quenching process, a shot blasting process, a coining process, and a machining process.

  In the forging process, the material steel is formed by hot forging. The material steel is, for example, carbon steel (S40C to S50C).

  The quenching process includes a temperature raising process and a cooling process, and the heat treatment apparatus and the heat treatment method according to the first embodiment are applied to the workpiece 10.

  In the shot blasting process, the oxide scale on the surface of the workpiece 10 is removed. In the coining process, for example, the thickness of the workpiece 10 is corrected by mild cold forging.

  In the machining process, machining is applied to finish the sliding parts of the large end and small end, and to form oil holes in the large end and small end, and a connecting rod as a product is obtained. . It is also possible to improve fatigue strength by performing shot peening between the coining process and the machining process.

  3 is a perspective view for explaining a hollow member in the heat treatment apparatus according to Embodiment 1, FIG. 4 is a schematic view for explaining the first and second nozzles shown in FIG. 3, and FIG. 6 is a side view for explaining a workpiece fixing means in the heat treatment apparatus according to Embodiment 1. FIG.

  The heat treatment apparatus includes a cooling device 100 into which the workpiece 10 is inserted, a fixing unit 180 that grips the workpiece 10, and a driving device 185 for rotating the workpiece 10.

  The cooling device 100 is a substantially cylindrical hollow member, and includes a main body part 110, a bracket part 150, an insulator 155, injection ports 162 and 167, and first and second nozzles 172 and 177.

  The main body 110 is a conductor and has a substantially cylindrical shape in which the connecting portion 14 of the workpiece 10 can be disposed. The bracket portion 150 is a conductor, has a substantially T-shape, and includes a support column 151 extending from the main body 110 and a base 152 extending from the end of the support column 151 in a substantially right angle direction. The base 152 has a bolt hole 153 for fixing to a high frequency generator (not shown). The fixing method of the cooling device 100 with respect to the high frequency generator is not limited to bolt fastening, and can be changed as appropriate.

  The insulator 155 extends from the end surface of the base portion 152 of the bracket portion 150 to the end surface of the inner peripheral surface 115 of the main body portion 110 via the support column portion 151. Therefore, when the alternating current from the high frequency generator is supplied, the main body 110 functions as an induction heating coil, and constitutes a heating means for raising the connecting portion 14 of the workpiece 10 to the quenching temperature. That is, the induction heating coil is integrated with the cooling device 100.

The inlets 162 and 167 are connected to first and second piping systems 142 and 147 for supplying the cooling media C ₁ and C ₂ . The cooling media C ₁ and C ₂ are, for example, water.

The first and second nozzles 172 and 177 are arranged on the inner peripheral surface 115 of the main body 110 and communicate with the inlets 162 and 167 via first and second flow paths arranged inside the main body 110. is doing. Therefore, the first and second nozzles 172 and 177 can inject the cooling media C ₁ and C ₂ supplied to the inlets 162 and 167 toward the connecting portion 14 of the workpiece 10.

The concavo-convex portion of the work 10 has a front side and a back side with respect to the rotation direction of the work 10. The first nozzle 172 is used for injecting a cooling medium C ₁ that cools the surface side of the uneven portion of the workpiece 10. The second nozzle 177 is used to inject a cooling medium C ₂ for cooling the rear side of the irregular portion of the workpiece 10.

  The orientations of the first and second nozzles 172 and 177 are set so as to reduce the difference between the cooling rate on the surface side and the cooling rate on the back side of the concavo-convex portion of the workpiece 10. That is, the heat treatment apparatus according to the first embodiment, when the material to be heat-treated is rotating, based on the direction of the first and second nozzles 172 and 177, the cooling rate on the surface side of the material to be heat-treated and the back side The difference from the cooling rate can be reduced, and cooling unevenness can be suppressed.

Coolant C ₁ is substantially perpendicular injection to the surface side, the cooling medium C ₂ are preferably substantially perpendicular injection to the back side.

  The fixing means 180 includes, for example, an upper chuck portion 182 and a lower chuck portion 184 having a hydraulic movable arm. The upper chuck portion 182 is used for gripping the large end portion 11 of the workpiece 10 and is rotatably installed. The lower chuck portion 184 is used for gripping the small end portion 16 of the workpiece 10 and is rotatably installed. The mechanism for gripping the large end portion 11 and the small end portion 16 of the workpiece 10 is not particularly limited.

  The driving device 185 is, for example, a motor, and is used for driving the upper chuck portion 182 to rotate the workpiece 10. On the other hand, the cooling device 100 includes first and second nozzles 172 and 177 for integrating the induction heating coil and cooling the workpiece 10. Therefore, the driving device 185 is used when the workpiece 10 is heated to the quenching temperature and when the workpiece 10 heated to the quenching temperature is cooled. That is, the driving device 185 rotates the second drive means for rotating the heat-treated material inserted into the coil and the heat-treated material heated to the quenching temperature in order to raise the temperature to the quenching temperature. It also serves as the first drive means for causing

  Next, the hollow member will be described in detail. 6 is a plan view of the hollow member shown in FIG. 3, FIG. 7 is a sectional view for explaining the first section and the inner layer portion of the outer layer portion shown in FIG. 6, and FIG. 8 is shown in FIG. It is sectional drawing for demonstrating the 2nd division and inner layer part of an outer layer part.

  The main body 110 of the cooling device 100 includes an outer layer part 120 and an inner layer part 130 located inside the outer layer part 120.

The outer layer portion 120 is divided into two by a partition wall 125, and has a first section 122 to which the injection port 162 is connected and a second section 127 to which the injection port 167 is connected. The cooling medium C ₂ supplied from the second piping system 147 connected to the injection port 167 has a higher pressure than the cooling medium C ₁ supplied from the first piping system 142 connected to the injection port 162.

  The inner layer portion 130 is divided in accordance with the number and position of the first and second nozzles 172 and 177, and has a first small section 132 having an inner peripheral surface 115 on which the first nozzle 172 is disposed. And a second small section 137 having an inner peripheral surface 115 in which the second nozzle 177 is disposed.

  The first small section 132 has an opening 133 for communicating with the first section 122. The first section 122, the opening 133, and the first small section 132 constitute a first flow path for connecting the first nozzle 172 and the first piping system 142. The second small section 137 has an opening 138 for communicating with the second section 127. The second section 127, the opening 138, and the second small section 137 constitute a second flow path for connecting the second nozzle 177 and the second piping system 147.

Since the internal pressure of the second compartment 127 is greater than the internal pressure of the first compartment 122, the internal pressure of the second small compartment 137 is greater than the first small compartment 132. When the first and which is the inner diameter of the second nozzle 172 and 177 is identical, the second nozzle 177 low pressure of the cooling medium _{C 1} the injection rate of the first nozzle 172 is supplied, the cooling medium _{C 2} of the high pressure is supplied Smaller than the injection speed. Therefore, in the case where the workpiece 10 is rotating, the work 10 and the relative velocity of the cooling medium C ₁ on the surface side of the uneven portion, the cooling medium C ₂ on the rear side of the irregular portion of the workpiece 10 with the relative velocity Differences can be reduced.

Since the relative speeds of the cooling media C ₁ and C ₂ on the front surface side and the back surface side of the concavo-convex portion of the workpiece 10 correspond to the cooling speed, the reduction in the relative speed difference causes the cooling speed difference to be reduced. Therefore, it is preferable to adjust the injection speeds of the cooling media C ₁ and C ₂ so that the relative speeds coincide with each other.

Jet velocity of the coolant _C 1, _{C 2} is not limited to adjusting the pressure of the cooling medium _C 1, _{C 2,} can be adjusted by the inner diameter of the first and second nozzles 172 and 177. For example, the pressure of the cooling media C ₁ and C ₂ supplied to the first and second nozzles 172 and 177 is the same by making the inner diameter of the first nozzle 172 larger than the inner diameter of the second nozzle 177. even the relative velocity of the cooling medium C1 at the surface side of the uneven portion of the workpiece 10, the difference between the cooling medium C ₂ relative speed in the back side of the irregular portion of the workpiece 10, can be reduced is there.

Moreover, both the inner and the pressure of the cooling medium _C 1, _{C 2} of the first and second nozzles 172 and 177 adjusted, it is possible to control the injection speed of the cooling medium _C 1, _{C 2.} Furthermore, the injection speeds of the cooling media C ₁ and C ₂ can be adjusted by the supply amount of the cooling media.

  Next, the heat treatment method according to Embodiment 1 will be described.

  In the temperature raising step, first, the workpiece 10 is inserted into the main body 110 of the cooling device 100. The connecting portion 14 of the workpiece 10 is disposed relative to the inner peripheral surface 115 of the main body portion 110, and the large end portion 11 and the small end portion 16 of the workpiece 10 are the upper chuck portion 182 and the lower chuck portion of the fixing means 180. 184 is gripped.

  The driving device 185 drives the upper chuck portion 182 to rotate the workpiece 10. The high frequency generator is activated, and an alternating current is supplied to the main body 110 of the cooling device 100 via the base portion 152 and the support column 151 of the bracket portion 150 of the cooling device 100. The main body 110 functions as an induction heating coil and heats the connecting portion 14 of the rotating workpiece 10.

  When the connecting portion 14 of the workpiece 10 is heated to a predetermined quenching temperature, the operation of the high frequency generator is stopped.

Since the first and second nozzles 172 and 177 for injecting the cooling mediums C ₁ and C ₂ are arranged on the inner peripheral surface 115 of the main body 110 to which the connecting portion 14 of the workpiece 10 is opposed, the temperature rises. The workpiece 10 heated to the quenching temperature in the process moves to the cooling process while continuing to rotate. In other words, there is no interruption in the rotation of the workpiece 10 during the transition between the temperature raising process and the cooling process, and the process shifts from the temperature raising process to the cooling process continuously, thereby shortening the cycle time and improving the productivity. Is possible.

In the cooling process, first, the cooling media C ₁ and C ₂ are supplied to the outer layer portion 120 of the main body 110 of the cooling device 100 via the first and second piping systems 142 and 147 and the inlets 162 and 167. Is done.

The cooling medium C ₁ is introduced into the first small section 132 having the inner peripheral surface 115 in which the first nozzle 172 is disposed via the first section 122 to which the inlet 162 is connected and the opening 133. . Cooling medium _{C 2} goes through the second compartment 127 and the opening 138, inlet 167 is connected, to a second small compartment 137 having an inner peripheral surface 115 of second nozzle 177 is disposed, it is introduced .

Therefore, the first and second nozzles 172 and 177 spray the cooling medium C ₁ and the cooling medium C _2, and are heated to the quenching temperature and on the surface side and the plane side of the concavo-convex part of the rotating workpiece 10. Cool each.

  The orientations of the first and second nozzles 172 and 177 are set so as to reduce the difference between the cooling rate on the surface side and the cooling rate on the back side of the concavo-convex portion of the workpiece 10. That is, in the heat treatment method according to Embodiment 1, when the material to be heat-treated is rotating, the cooling rate on the surface side of the material to be heat-treated and the back surface side based on the directions of the first and second nozzles 172 and 177. The difference from the cooling rate is reduced, and uneven cooling is suppressed.

The cooling medium C ₁ is substantially perpendicular injection to the surface side, the cooling medium C ₂ are preferably substantially perpendicular injection to the back side.

Since the relative speeds of the cooling media C ₁ and C ₂ on the front surface side and the back surface side of the concavo-convex portion of the workpiece 10 correspond to the cooling speed, the reduction in the relative speed difference causes the cooling speed difference to be reduced. Therefore, it is preferable to adjust the injection speeds of the cooling media C ₁ and C ₂ so that the relative speeds coincide with each other. Jet velocity of the coolant _C 1, _{C 2,} it is also possible to adjust the pressure of the cooling medium _C 1, _{C 2} and / or the first and the inner diameter of the second nozzle 172 and 177.

  As described above, Embodiment 1 can provide a heat treatment apparatus and a heat treatment method that have good productivity and can uniformly cool a material to be heat treated.

  Note that the reduction in the difference in cooling rate is caused by the direction of the first and second nozzles, the difference in the cooling medium injection speed in the first and second nozzles, the inner diameter difference between the first and second nozzles, and the first and second nozzles. It is not limited to the form using the pressure difference of the supplied cooling medium, but it is also possible to use the difference in the amount of cooling medium supplied to the first and second nozzles and the temperature difference of the cooling medium.

  The number and position of the first and second nozzles are not particularly limited, and the size of the material to be heat treated, the shape of the concavo-convex portion (complexity), the amount of heat removal (quenching temperature of the material to be heat treated), and the physical properties of the cooling medium It is possible to set as appropriate in consideration of the above.

  The induction heating coil is not limited to being integrated with a cooling device (hollow member) used for cooling the material to be heat-treated, and can be arranged as an independent component.

  FIG. 9 is a schematic diagram for explaining the heat treatment apparatus according to the second embodiment. In addition, about the member which has the function similar to Embodiment 1, the same code | symbol is used and in order to avoid duplication, the description is abbreviate | omitted.

  The heat treatment apparatus according to Embodiment 2 includes a tachometer 291, flow meters 293 and 294, pressure gauges 296 and 298, pressure adjustment devices 297 and 299, and a control device 290.

  The tachometer 291 is disposed on the rotation shaft of the upper chuck portion of the fixing means, and constitutes a detection means for detecting a change in the rotation speed of the work 10. The rotation speed data of the work 10 is sent to the control device 290. Send.

Velocity meter 293 and 294 are located at the tip of the first and second nozzles 272,277, the velocity data of the cooling medium _C 1, _{C 2,} which is injected from the first and second nozzles 272,277, controller 290 Send to.

The pressure gauges 296, 298 and the pressure adjusting devices 297, 299 are disposed in the first and second piping systems 242, 247 in the vicinity of the inlets 262, 267. The pressure gauges 296 and 298 transmit the pressure data of the first and second piping systems 242 and 247, that is, the pressure data of the cooling media C ₁ and C ₂ supplied to the first and second nozzles 272 and 277, to the control device 290. To do. The pressure regulators 297 and 299 are used to change the pressure of the cooling media C ₁ and C ₂ .

  The control device 290 has an interface for transmitting and receiving data to the tachometer 291, flowmeters 293, 294, pressure gauges 296, 298, and pressure regulators 297, 299, and variations in the number of rotations of the workpiece 10. It is used to remove the adverse effects caused by the above and keep the heat treatment quality of the workpiece 10 constant.

More specifically, variations in the number of revolutions of the workpiece 10 are detected in real time due to fluctuations in the number of revolutions data from the tachometer 291. Then, based on the variation, the cooling medium C ₁ and the fluctuations in the relative velocity of the cooling medium C ₂ on the surface side and the back side of the irregular portion of the workpiece 10 is calculated.

Next, the speeds of the cooling media C ₁ and C ₂ ejected from the first and second nozzles 272 and 277, which are required to remove the relative speed fluctuation, are calculated. Then, the pressure adjusting devices 297 and 299 are set so that the velocity data of the cooling media C ₁ and C ₂ ejected from the first and second nozzles 272 and 277 from the flowmeters 293 and 294 coincide with the calculated velocity. And the pressures of the cooling media C ₁ and C ₂ supplied to the first and second nozzles 272 and 277 are changed.

  As described above, the second embodiment can remove the adverse effect due to the variation in the rotational speed of the workpiece 10 and ensure the uniform heat treatment quality of the workpiece 10.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

  For example, the material to be heat-treated is not limited to the connecting rod, and can be applied to, for example, a gear having an uneven portion in the circumferential direction.

FIG. 3 is a plan view for explaining the workpiece according to the first embodiment. It is a side view of the workpiece | work shown by FIG. 3 is a perspective view for explaining a hollow member in the heat treatment apparatus according to Embodiment 1. FIG. It is the schematic for demonstrating the 1st and 2nd nozzle shown by FIG. 6 is a side view for explaining a workpiece fixing means in the heat treatment apparatus according to Embodiment 1. FIG. It is a top view of the hollow member shown by FIG. It is sectional drawing for demonstrating the 1st division and inner layer part of the outer layer part shown by FIG. It is sectional drawing for demonstrating the 2nd division and inner layer part of the outer layer part shown by FIG. FIG. 6 is a schematic diagram for explaining a heat treatment apparatus according to a second embodiment.

Explanation of symbols

10. Work (material to be heat treated),
11. Large end,
12. Semi-circular part,
13, 15 ... Connection part,
14. Connection parts,
16. Small end,
17 .. opening,
100 .. Hollow member,
110 .. Body part,
115 .. Inner surface,
120 .. outer layer part,
122 .. 1st section,
125 .. Bulkhead,
127 .. second section,
130 .. Inner layer,
132 .. 1st subdivision,
133 .. opening,
137 .. Second subdivision,
138 .. opening,
142 .. First piping system,
147 .. Second piping system,
150 .. Bracket part,
151 .. strut part,
152 .. Base
153 .. Bolt hole,
155..Insulator,
162 .. first inlet,
167 .. Second inlet,
172 .. First nozzle,
177 ... second nozzle,
180 .. fixing means,
182 .. Upper chuck part,
184 .. Lower chuck part,
185 .. Drive device,
241, the first piping system,
247 ... Second piping system,
262 .. First inlet,
267 ... the second inlet,
272 ... the first nozzle,
277 ... Second nozzle,
290 .. Control device,
291 ・ ・ Tachometer,
293,294 ・ ・ velocimeter,
296,298 ・ ・ Pressure gauge,
297, 299 ... Pressure adjusting device.

Claims (28)

First driving means for rotating the material to be heat-treated at the quenching temperature; and
A cooling means for cooling the heat treated material in rotation;
The heat-treated material has a concavo-convex portion in a circumferential direction, and the concavo-convex portion has a front side and a back side with respect to a rotation direction of the heat-treated material,
The cooling means includes first and second nozzles for injecting a cooling medium for cooling the front surface side and the back surface side,
An orientation of the first and second nozzles is set so as to reduce a difference between the cooling rate on the front side and the cooling rate on the back side.   The cooling medium from the first nozzle is jetted substantially perpendicular to the surface side, and the cooling medium from the second nozzle is jetted substantially perpendicular to the back side. Item 2. The heat treatment apparatus according to Item 1.   2. The relative speed on the surface side of the cooling medium ejected from the first nozzle coincides with the relative speed on the back side of the cooling medium ejected from the second nozzle. Or the heat processing apparatus of Claim 2.   4. The heat treatment apparatus according to claim 1, wherein a speed of the cooling medium ejected from the first nozzle is smaller than a speed of the cooling medium ejected from the second nozzle.   5. The heat treatment apparatus according to claim 1, wherein an inner diameter of the first nozzle is larger than an inner diameter of the second nozzle.   The heat treatment apparatus according to claim 1, wherein the pressure of the cooling medium supplied to the first nozzle is smaller than the pressure of the cooling medium supplied to the second nozzle. Detecting means for detecting a change in the rotational speed of the heat-treated material; and
Control means for adjusting the speed of the cooling medium ejected from the first nozzle and / or the speed of the cooling medium ejected from the second nozzle according to the change in the rotational speed detected by the detecting means. It has these. The heat processing apparatus of any one of Claims 1-6 characterized by the above-mentioned.   The speed of the cooling medium is adjusted by changing a pressure of the cooling medium supplied to the first nozzle and / or a pressure of the cooling medium supplied to the second nozzle. 8. The heat treatment apparatus according to 7.   The cooling means includes a substantially cylindrical hollow member on which the heat-treated material is disposed, and the hollow member has an inner peripheral surface on which the first and second nozzles are disposed. The heat treatment apparatus according to any one of claims 1 to 8. The cooling means has a first piping system for supplying a cooling medium to the first nozzle part, and a second piping system for supplying a cooling medium to the second nozzle part,
The hollow member has a first flow path for connecting the first nozzle and the first piping system, and a second flow path for connecting the second nozzle and the second piping system. The heat treatment apparatus according to claim 9. The hollow member has an outer layer part and an inner layer part located inside the outer layer part,
The outer layer portion has a first section to which the first piping system is connected and a second section to which the second piping system is connected,
The inner layer portion has a first small section having an inner peripheral surface on which the first nozzle is disposed and a second small section having an inner peripheral surface on which the second nozzle is disposed;
The first small section has an opening for communicating with the first section,
The heat treatment apparatus according to claim 9 or 10, wherein the second small section has an opening for communicating with the second section. A coil for induction heating to raise the heat-treated material to a quenching temperature; and
The heat treatment apparatus according to any one of claims 1 to 11, further comprising: second driving means for rotating the heat treatment material inserted into the coil. A coil for induction heating for raising the temperature of the heat-treated material to a quenching temperature; and
A second drive means for rotating the heat-treated material inserted in the coil;
The heat treatment apparatus according to any one of claims 9 to 11, wherein the coil is integrated with the hollow member.   The heat treatment apparatus according to claim 13, wherein the first driving unit also serves as the second driving unit.   The heat treatment apparatus according to claim 1, wherein the heat treatment material is a forged part.   The heat treatment apparatus according to claim 15, wherein the forged component is a connecting rod used for connecting a piston and a crankshaft in an internal combustion engine and transmitting a reciprocating motion of the piston to the crankshaft. Having a cooling step for cooling the heat-treated material heated to the quenching temperature while being rotated by the first driving means;
The heat-treated material has a concavo-convex portion in a circumferential direction, and the concavo-convex portion has a front side and a back side with respect to a rotation direction of the heat-treated material,
The front side and the rear side are cooled by a cooling medium sprayed from the first and second nozzles, respectively.
The direction of the first and second nozzles is set so as to reduce the difference between the cooling rate on the front side and the cooling rate on the back side.   The cooling medium from the first nozzle is jetted substantially perpendicular to the surface side, and the cooling medium from the second nozzle is jetted substantially perpendicular to the back side. Item 18. The heat treatment method according to Item 17.   The relative speed on the front surface side of the cooling medium ejected from the first nozzle and the relative speed on the rear surface side of the cooling medium ejected from the second nozzle are matched with each other. The heat treatment method according to claim 18.   The heat treatment method according to any one of claims 17 to 19, wherein a speed of the cooling medium ejected from the first nozzle is made smaller than a speed of the cooling medium ejected from the second nozzle. .   21. The heat treatment method according to claim 17, wherein an inner diameter of the first nozzle is larger than an inner diameter of the second nozzle.   The heat treatment method according to any one of claims 17 to 21, wherein the pressure of the cooling medium supplied to the first nozzle is made smaller than the pressure of the cooling medium supplied to the second nozzle. . The speed of the cooling medium ejected from the first nozzle and / or the speed of the cooling medium ejected from the second nozzle is adjusted according to a change in the rotation speed of the heat-treated material. Item 23. The heat treatment method according to any one of Items 17-22.   24. The speed of the cooling medium is adjusted by changing the pressure of the cooling medium supplied to the first nozzle and / or the pressure of the cooling medium supplied to the second nozzle. A heat treatment method according to 1.   25. The method according to claim 17, further comprising: a temperature raising step for raising the temperature of the material to be heat-treated inserted in the induction heating coil to a quenching temperature while rotating the material to be heat-treated by the second driving means. The heat treatment method according to item 1. The coil is integrated with a substantially cylindrical hollow member having an inner peripheral surface on which the first and second nozzles are disposed and the heat-treated material is disposed on the inside.
The first driving means also serves as the second driving means,
26. The heat treatment method according to claim 25, wherein the heat treated material heated to the quenching temperature in the temperature raising step shifts to the cooling step while continuing to rotate.   The heat treatment method according to any one of claims 17 to 26, wherein the material to be heat treated is a forged part.   28. The heat treatment method according to claim 27, wherein the forged component is a connecting rod used for connecting a piston and a crankshaft in an internal combustion engine and transmitting a reciprocating motion of the piston to the crankshaft.

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