JP2017171956A - Cooling treatment facility and cooling treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling treatment facility, which may pertinently prevent problems, such as hardening failure and increment in distortion, due to unevenness in cooling speed upon hardening a treatment object, such as a mold.SOLUTION: There is provided a cooling treatment facility for cooling a heated mold 12, which comprises an infrared camera 24 detecting temperature distribution on a surface of the mold 12, a nozzle 22 ejecting cooling gas from an ejection port 22a to cool the surface of the mold 12, a movable arm 36 movably holding the nozzle 22, and a controlling part 30 performing operation control of a facility. Due to control by the controlling part 30, the nozzle 22 is moved near a highest temperature part on the surface of the mold 12 so that the highest temperature part is topically cooled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling processing facility and a cooling processing method used for cooling processing when a workpiece such as a mold is quenched.

Conventionally, as one cooling method at the time of quenching, there is known a method in which a mold heated to a quenching temperature in a heating chamber is taken out of the heating chamber and directly placed in an oil cooling bath for quenching.
However, when such rapid cooling is performed directly on a mold that is in a high temperature state in a large mold, a large temperature difference occurs between each part, for example, at the corner and the center of the mold, resulting in thermal stress. The mold will be greatly distorted or cracked.

On the other hand, if the mold in the high temperature state that comes out of the heating chamber is slowly cooled by gas cooling such as cooling in air or other gas atmosphere or blast cooling, it is possible to reduce distortion and prevent cracking. .
In particular, tool steels used for molds and the like have a remarkably high quenching and hardening ability, and therefore it is possible to apply a method of quenching by slow cooling such as cooling or blast cooling.

  However, if the object to be processed is a large mold, the cooling rate varies depending on the part of the object to be processed even if it is slowly cooled, and sufficient baking occurs at the highest temperature part where the cooling rate is the slowest. In some cases, the desired hardness cannot be obtained.

In the following Patent Document 1, the temperature distribution on the mold surface is detected with an infrared camera, the highest temperature part on the mold surface is specified, and the cooling condition of the mold is controlled based on the detected temperature at the highest temperature part. The point made to do is disclosed.
However, since the whole mold is blast cooled based on the detected temperature at the maximum temperature part, the other part is forcibly cooled at the same time as the maximum temperature part. For this reason, even if the quenching failure at the highest temperature portion is improved, the cooling rate of the entire mold is increased, so that the problem of increased distortion is likely to occur. That is, in order to solve both problems of quenching failure and increase in distortion in the quenching process, further improvement is necessary.

JP 2014-237886 A

  The present invention is based on the above circumstances, and is a cooling process that can satisfactorily prevent problems of quenching failure and increased distortion caused by variations in cooling rate when quenching workpieces such as molds. The object is to provide equipment and a cooling method.

  Thus, claim 1 relates to a cooling processing facility, which is a cooling processing facility for cooling a heated object to be processed, the temperature detecting means for detecting the temperature distribution of the surface of the object to be processed, and the discharge A cooling means for discharging the cooling gas from the outlet to cool the surface of the object to be processed, a moving means for holding the cooling means so as to be movable, and a controller for controlling the operation of the equipment, Under the control of the control unit, the cooling means is moved to the vicinity of the highest temperature portion on the surface of the object to be processed to locally cool the highest temperature portion.

  According to a second aspect of the present invention, in the first aspect, the moving means has a movable arm whose tip is movable in a three-dimensional direction, and the cooling means is held by the tip of the movable arm. It is characterized by.

  According to a third aspect of the present invention, in any one of the first and second aspects, the local cooling is performed in a state where the discharge port is located within 500 mm from the surface of the workpiece.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, when the surface temperature of the object to be processed is 800 ° C., the heat transfer coefficient has a cooling capacity of 80 W / m · k or more. Features.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the control unit is configured such that the temperature detected by the temperature detection unit at the highest temperature portion is an appropriate planned surface temperature that is planned in advance. Further, the cooling condition is controlled based on the difference between the detected temperature and the planned surface temperature.

  Claim 6 is a method for cooling a heated object to be processed, wherein the object to be processed is allowed to cool, and the temperature distribution of the surface of the object to be processed is detected to detect the surface of the object to be processed. A maximum temperature region is specified, a cooling unit is moved to the vicinity of the maximum temperature region, and the maximum temperature region is locally cooled by a cooling gas discharged from the cooling unit.

According to a seventh aspect of the present invention, in the sixth aspect, the object to be processed is a mold having a flat back surface on the surface opposite to the design surface, and the cooling means is used for the back surface. It is characterized by performing local cooling.

As described above, the cooling processing facility of the present invention includes temperature detection means for detecting the temperature distribution of the surface of the heated object to be processed and cooling for discharging the cooling gas from the discharge port to cool the surface of the object to be processed. Means, a moving means for holding the cooling means movably in position, and a controller for controlling the operation of the equipment, and the control means controls the cooling means in the vicinity of the highest temperature portion on the surface of the workpiece. It is moved to locally cool the highest temperature region.
According to the present invention, the cooling gas is applied to the highest temperature portion specified based on the temperature distribution of the surface of the workpiece obtained by the temperature detecting means, that is, the portion where the cooling rate is the slowest and the quenching failure is likely to occur. By discharging the water, it is possible to increase the cooling rate at the highest temperature portion and to favorably prevent the occurrence of quenching failure due to the slow cooling rate.
In the present invention, since the cooling means is moved to the vicinity of the highest temperature portion to be cooled by the moving means to perform cooling, the cooling area is limited to the highest temperature portion or its peripheral portion. For this reason, parts other than the highest temperature part can be effectively prevented from being locally cooled by the cooling means of the present invention. That is, it is possible to effectively prevent the amount of distortion from being increased due to excessive cooling, where the cooling rate is increased at the originally proper cooling rate.

  Here, in order to satisfactorily locally cool the maximum temperature portion, it is desirable that the distance from the surface of the object to be processed to the discharge port from which the cooling gas is discharged is 500 mm or less (Claim 3), and the cooling capacity It is desirable that the heat transfer coefficient is 80 W / m · k or more when the surface temperature of the workpiece is 800 ° C. (Claim 4).

Here, the heat transfer coefficient is the amount of heat transfer that flows from the object to be processed into the atmosphere per unit area, per unit time, and at a temperature difference of 1 ° C. between the object surface and the surrounding atmosphere. Represents the level of cooling of the workpiece.
Specifically, the amount of cooling gas sent to the object to be processed, gas pressure, atmosphere temperature, shape of the object to be processed, and the degree of total cooling intensity, including the individual cooling conditions for the object to be processed. Represent. This heat transfer coefficient is determined by setting the object to be processed such as a target mold, measuring the temperature change of the surface of the object to be processed and its surrounding atmosphere during cooling, and how much heat has moved from the object to be processed. Knowing it can be determined experimentally in advance.

In the present invention, the moving means has a movable arm whose tip can be moved in a three-dimensional direction, and the cooling means can be held at the tip of the movable arm.
As described above, in the present invention, it is necessary to bring the cooling means close to the vicinity of the workpiece. However, the workpiece heated to the quenching temperature may be as high as 1000 ° C. or higher. Therefore, if the cooling means is held at the distal end portion of the movable arm according to claim 2, the portion approaching the object to be processed that becomes extremely hot is limited to the distal end portion of the movable arm and the cooling means attached thereto. The driving mechanism or the like that does not have sufficient heat resistance can be disposed away from the object to be processed.

  Further, in the present invention, the temperature detection means can accurately know the temperature of the highest temperature part, so that the detection temperature of the highest temperature part and the expected temperature are set to be the predetermined expected surface temperature. The cooling condition can be controlled based on the difference from the surface temperature.

Next, claim 6 relates to a cooling processing method. In this cooling processing method, the object to be processed is allowed to cool, and the temperature distribution on the surface of the object to be processed is detected to determine the maximum temperature portion on the surface of the object to be processed. The cooling means is moved to the vicinity of the highest temperature portion, and the highest temperature portion is locally cooled by the cooling gas discharged from the cooling means.
According to this cooling treatment method, the distortion generated during the cooling treatment can be suppressed by allowing the whole workpiece to cool, while the cooling gas is blown separately for the highest temperature portion of the surface of the workpiece. Since local cooling is performed, poor quenching due to a slow cooling rate can be well prevented.
The cooling treatment method of the present invention is particularly effective as a cooling treatment method at a high temperature of 600 ° C. or higher. Therefore, when the maximum temperature portion reaches a predetermined temperature of 600 ° C. or lower, it is possible to switch to oil cooling and continue the cooling process. It is also possible to continue the cooling process to near room temperature by the cooling process method of the present invention.

  By the way, in general, since a flat back surface opposite to the design surface is a reference surface during mounting or machining, it is required to suppress the amount of distortion in the surface on the back surface in particular. For this reason, when performing the cooling process of the mold using the cooling process method of the present invention, it is preferable to perform local cooling on the back surface of the mold.

  According to the present invention as described above, the cooling processing equipment capable of satisfactorily preventing the problems of quenching failure and increased distortion caused by variations in the cooling rate when quenching the workpiece such as a mold. And a cooling processing method can be provided.

It is the figure which showed the whole structure of the cooling processing equipment of one Embodiment of this invention. It is the figure which expanded and showed the front-end | tip part of the movable arm of FIG. It is the figure which showed the state before and behind at the time of rotating the front-end | tip part of the movable arm of FIG. It is the figure which showed the relationship between the color of the laser beam used for distortion measurement, and measurement accuracy. It is a figure for demonstrating the cooling operation of the embodiment. It is the figure which showed the relationship between a cooling rate, the hardening state of a metal mold | die, and the maximum distortion amount. It is the figure which showed an example of the result of the distortion amount measurement performed in the middle of cooling processing.

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating an overall configuration of a cooling processing facility 10 according to the present embodiment. In FIG. 1, reference numeral 12 denotes a mold as an object to be processed, which is heated to a quenching temperature in a heating chamber (not shown) and then placed on a set jig 14 by a crane or the like. Reference numeral 20 denotes a robot to which a nozzle 22 for local cooling described later is attached. Reference numeral 24 denotes an infrared camera which is positioned in front of the mold 12 and serves as a temperature detection means for detecting the temperature distribution on the surface of the mold 12.
Further, the cooling processing facility 10 has a compressor 26, a dryer 27, and an air tank 28 as a series of devices for generating and storing compressed air on the left side in FIG. Further, the cooling processing facility 10 includes a control unit 30 that controls the operation of the facility.

The mold 12 is made of tool steel (SKD61), has a width 600 mm × height 600 mm × thickness 150 mm, and has a design surface 12 a having irregularities, and a flat back surface 12 b located on the opposite side of the design surface 12 a. In this example, the mold 12 is placed on the setting jig 14 with the back surface 12b facing forward (the side on which the robot 20 and the infrared camera 24 are disposed).
The steel type used for the mold 12 is not particularly limited, and special steel having excellent hardenability can be appropriately employed. Also, the size of the mold is not particularly limited, but the present invention is particularly effective when the weight is 150 kg or more, in which a temperature difference (variation in cooling rate) easily occurs during the cooling process during quenching.

  The position of the infrared camera 24 is set so that the entire back surface 12b of the mold 12 is included in the detection range, and the temperature distribution of the surface of the mold 12 (specifically, the back surface 12b) is detected. 12 The highest temperature part of the surface is specified, and the temperature of the highest temperature part is detected. The result of temperature detection by the infrared camera 24 is sent to the control unit 30. The control unit 30 controls the cooling condition for the mold 12 based on the detection result.

The robot 20 has a base portion 34 fixed on the gantry 32 and a movable arm 36 extending therefrom. The movable arm 36 has a plurality of joint portions that rotate or bend, and the distal end portion 38 of the movable arm 36 moves vertically and horizontally, and in the front-rear direction, that is, in a three-dimensional direction, within a movable range indicated by a two-dot chain line in FIG. It can be moved. A nozzle 22 for locally cooling the mold 12 is attached to the tip portion 38.
The mold 12 immediately after being heated to the quenching temperature becomes very high. In this example, the robot 20 is installed at a position shifted from the front of the mold 12 in order to prevent the influence of the radiant heat from the mold 12 from reaching the entire robot 20.

FIG. 2 is an enlarged view of the distal end portion 38 of the movable arm 36. As shown in the figure, the distal end portion 38 is rotatably connected to the base side of the movable arm 36 around the joint axis P.
A box-shaped heat shield 42 is attached and fixed to the attachment member 40 on the opposite side of the joint portion P of the distal end portion 38 by attachment bolts 44.

  The heat shield 42 includes a fixed portion 42a that is directly fixed to the mounting member 40 on the movable arm 36 side, a flat substrate 42b that is fixed in a state orthogonal to the fixed portion 42a, and a surface on the substrate 42b. And a lid 42c fixed to the base 42b so as to cover one surface, and has a box shape in which heat shielding walls are formed in the vertical and horizontal directions and the front and rear directions as a whole. The heat shield 42 shields heat radiated from the mold 12 toward the distal end portion 38 of the movable arm 36 to protect a sensor and the like housed inside.

Reference numeral 46 denotes a laser type displacement detection sensor used for measuring the distortion of the surface of the mold 12. The laser type displacement detection sensor 46 is housed in the heat shield 42 and is attached to the base 42 b via a bracket 47 having a T-shaped cross section. It is fixed to the inner surface. As shown in FIGS. 2 (A) and 2 (B), the sensor 46 is located at a position farthest from the joint axis P (on the left side in the drawing), that is, at a position closest to the surface of the mold 12. The shield 42 is disposed in the vicinity of the first wall surface 48. An opening 51 is formed in the first wall surface 48 and a heat-resistant glass 52 is fitted therein, and the detection laser light emitted from the light emitting portion 46 a of the sensor 46 is emitted to the outside through the opening 51. After being reflected from the surface of the mold 12 as the object, the light is received by the light receiving portion 46b through the opening 51. The received reflected light is imaged on the optical position detecting element in the light receiving portion 46b, and the amount of displacement in the height direction to the surface of the mold 12 is measured based on the imaging position.
In this example, the non-contact type strain measuring device 11 is configured by the sensor 46, the heat shield 42, and the movable arm 36 that holds these movably.

  In this example, in order to measure the displacement amount (distortion amount) of the surface of the mold 12 in a high temperature state heated to the quenching temperature using the sensor 46, if the laser light emitted from the sensor 46 is red, the mold 12 is susceptible to the red heat of itself. Accordingly, the sensor 46 of this example uses blue laser light having a wavelength of 350 to 450 nm.

  FIG. 4 shows the measurement accuracy when the laser light emitted from the laser displacement sensor 46 is red (FIG. (B)) and blue (wavelength is 350 to 450 nm) (FIG. (C)). It is a figure. The measurement results shown in FIGS. 4B and 4C create a step of 10 mm × 10 mm × 1 mm in height near the center of the block 13 of 300 mm × 300 mm × 300 mm shown in FIG. It is the result of measuring the level | step difference in the state which heated the block 13 at 800 degreeC. Specifically, the step of 1 mm is measured 10 times, and the average value of 10 times and the measured value having the largest difference from the average value are plotted as error bars. The measurement is performed while sequentially changing the measurement distance between the block 13 and the sensor 46.

  As shown in FIG. 4B, in the case of a red laser, a step of 1 mm cannot be measured accurately due to the influence of red heat of the block 13. On the other hand, in the case of the blue laser, as shown in FIG. 4C, the step can be measured more accurately as the measurement distance (the distance between the block 13 and the sensor 46) is shorter. In mold distortion measurement, a repeat accuracy of 0.2 mm or less is required, but according to the results shown in FIG. 4, if the measurement distance is 500 mm or less for a blue laser, the repeat accuracy is within 0.2 mm. That is, it can be seen that measurement can be performed within an error range of ± 0.1 mm for a step of 1 mm.

However, since the mold 12 is extremely high in temperature, if the measurement distance (L _{1 in} FIG. 3A) is 500 mm or less, the temperature of the sensor 46 inside the thermal shield 42 may exceed the guaranteed operating range. For this reason, in this example, as shown in FIG. 2, an inlet 54 for introducing compressed air for cooling into the heat shield 42 is provided in the fixed portion 42 a of the heat shield 42. Through this introduction port 54, the tip of a pipe 55 connected to the air tank 28 through a flow rate adjusting valve (not shown) is inserted into the heat shield 42, and in this example, based on the control of the control unit 30. Then, the compressed air in the air tank 28 is supplied from the introduction port 54 into the heat shield 42. The base 42 b is formed with an exhaust port 58 communicating with the outside, and the compressed air introduced into the heat shield 42 is discharged to the outside through the exhaust port 58.
As described above, in this example, the configuration in which the compressed air circulates inside the heat shield 42 prevents the sensor 46 from becoming high temperature (specifically, 50 ° C. or more). In addition, it is also possible to prevent the sensor 46 from becoming high temperature by providing a water cooling mechanism portion on the first wall surface 48 that is located between the sensor 46 and the mold 12 and shields heat during strain measurement. Is possible.

On the other hand, as shown in FIG. 2 (A), the nozzle 22 for locally cooling the mold 12 is fixedly attached to the inside of the fixed portion 42a of the heat shield 42 via a bracket 60. The discharge port 22a protrudes outward from a second wall surface 49 that is different from the first wall surface 48 where the sensor 46 in the thermal shield 42 is disposed in proximity.
The nozzle 22 is connected to the air tank 28 via a flow rate adjusting valve (not shown). Based on the control of the control unit 30, the nozzle 22 is used for cooling the die for local cooling. Compressed air is discharged as gas.

  As described above, in this example, the discharge port 22a of the nozzle 22 is provided so that the cooling gas is discharged from the second wall surface 49 different from the first wall surface 48 of the heat shield 42, and the tip By rotating the part 38 around the joint axis P, switching between strain measurement and local cooling is performed. That is, when measuring the distortion of the mold 12, the first wall surface 48 of the thermal shield 42 is opposed to the surface of the mold 12 as shown in FIG. When local cooling of the mold 12 is performed, the second wall surface 49 of the heat shield 42 is opposed to the surface of the mold 12 as shown in FIG.

The operation when the cooling process is performed using the cooling processing facility 10 of the present embodiment will be specifically described below. In this example, the cooling process is performed so that the cooling rate at the highest temperature portion, that is, the slowest cooling portion in the mold 12 made of SKD 61 and having a width of 600 mm × height of 600 mm × thickness of 150 mm is 10 ° C./min. Shall.
As shown in FIG. 1, first, the mold 12 is heated to a quenching temperature in a heating chamber (not shown) and then placed on a set jig 14 by a crane or the like.
The mold 12 is allowed to cool in the atmosphere. At the same time, the infrared camera 24 detects the temperature distribution on the surface of the mold 12. And the highest temperature site | part of the metal mold | die 12 surface is specified based on the detection result of the temperature distribution. The control unit 30 outputs position information (X, Y coordinates) of the highest temperature part to the robot 20.

As shown in FIG. 3B, the robot 20 moves the discharge port 22a of the nozzle 22 attached to the distal end portion 38 of the movable arm 36 to the point G of the specified maximum temperature region. The maximum temperature site point distance above L ₂ of G of (in this case 300 mm) blown toward the maximum temperature site compressed air for cooling from the maximum temperature site (or highest temperature portion and the peripheral portion) locally Cooling.

In this example, this cooling operation is continued until the maximum temperature portion reaches 600 ° C. As indicated by the one-dot chain line in FIG. 5, the control unit 30 is preset with a transition of the planned surface temperature after starting the cooling operation, that is, a cooling rate (10 ° C./min in this example). The cooling condition is controlled based on the difference between the detected temperature and the planned surface temperature while moving the discharge port 22a of the nozzle 22 to the highest temperature region specified at any time by monitoring the camera 24.
Specifically, if the detected temperature of the highest temperature part is higher than the planned surface temperature shown in FIG. 5, the amount of compressed air for local cooling is increased, and if the detected temperature is lower than the planned surface temperature, Reduce the amount of compressed air for local cooling. By doing in this way, the highest temperature site | part in the back surface 12b used as the object of a cooling process can be cooled with the cooling rate which was planned, or the cooling rate approximated to this.
Even after the detected temperature of the highest temperature region falls below 600 ° C., it is possible to continue the cooling process so as to coincide with the transition of the preset surface temperature set in advance. In some cases, when the detected temperature of the highest temperature portion reaches a predetermined temperature of 600 ° C. or lower, it is possible to switch to oil cooling and continue the cooling process.

FIG. 6 shows a maximum of a mold cooling test piece block (SKD61, width 600 mm × height 600 mm × thickness 150 mm) at a constant cooling rate between 1000 ° C. and 500 ° C. as shown in FIG. It is the figure which performed the local cooling of the temperature site | part and showed the result evaluated about the quenching state and maximum distortion of the simulation test piece after completion of cooling processing. The cooling gas using atmospheric, height L ₂ of the discharge nozzles were from the mold surface and 300 mm.

Here, the quenching state was evaluated by examining the hardness at a predetermined location on the surface of the simulated test piece after completion of the cooling treatment to determine whether a predetermined hardness (HRC 48 or higher) was obtained.
For the maximum strain, after completion of the cooling treatment, the displacement in the height direction was measured at a predetermined position at two peripheral portions and one central portion on the surface of the mock test piece, and a line connecting both ends of the peripheral portion was used as a reference line. The amount of displacement in the height direction was evaluated as the maximum strain amount.

  According to the figure, quenching failure occurs when the cooling rate is less than 9 ° C./min. On the other hand, normal quenching is performed when the cooling rate is 9 ° C./min or more, but the maximum strain increases as the cooling rate increases. From this result, it can be seen that a suitable cooling rate in the mold simulation test piece, that is, a cooling rate that does not cause quenching failure and is within a maximum strain of 0.05 mm is 9 to 15 ° C./min. In this example, based on the preferable cooling rate obtained in this way, the transition of the planned surface temperature is set in the control unit 30 in advance, and the detected temperature of the highest temperature part coincides with the transition of the planned surface temperature. By controlling the cooling conditions in this way, it is possible to satisfactorily prevent the occurrence of poor quenching and distortion.

In the cooling processing facility of the present embodiment, it is possible to check the degree of distortion of the surface on which local cooling is performed during the cooling processing.
In this example, the nozzle 22 is configured such that compressed air for local cooling is discharged from a second wall surface 49 of the thermal shield 42 that is 90 ° different from the first wall surface 48 that emits laser light for detecting displacement. The discharge port 22a is provided, and by rotating the tip end portion 90 around the joint axis P by 90 °, it is possible to switch between a state in which local cooling is performed and a state in which the amount of distortion is measured.

  In a state where the first wall surface 48 of the heat shield 42 shown in FIG. 3A is opposed to the surface of the mold 12 that is the object to be measured, up to the point (X, Y coordinate) at which the displacement is to be measured. By sequentially moving the sensor 46 and detecting displacement at a plurality of designated measurement points on the surface of the mold 12, the displacement in the height direction of the surface, that is, the amount of distortion can be measured. FIG. 7 shows the result of detecting displacement at a plurality of measurement points located on a straight line by moving the sensor 46 in the horizontal direction along the back surface 12b of the mold 12 at the time of 800 ° C. during the cooling process. It is.

  In this way, in this example, since the mold surface distortion state can be detected in addition to the temperature distribution information on the mold surface during the cooling process, the cooling condition can be changed according to the distortion state. Is also possible. Note that local cooling is interrupted during strain measurement, but in this example, the local cooling state and strain measurement state can be switched in a short time, so the strain measurement is performed during the cooling process. Thus, the time period during which local cooling is interrupted can be shortened.

According to the present embodiment as described above, the highest temperature portion specified based on the temperature distribution of the back surface 12b of the mold 12 obtained by the infrared camera 24, that is, the portion where the cooling rate is the slowest and the quenching failure is likely to occur. On the other hand, by discharging the compressed air for cooling, it is possible to increase the cooling rate at the highest temperature portion and to satisfactorily prevent the occurrence of quenching failure due to the slow cooling rate.
In this embodiment, since the nozzle 22 for locally cooling the mold 12 is moved to the vicinity of the highest temperature portion to be cooled by the movable arm 36 and is cooled, the cooling area is the highest temperature portion or its surroundings. Limited to parts. For this reason, it can prevent effectively that parts other than the highest temperature part are forcedly cooled by the compressed air from the nozzle 22 of this embodiment. That is, it is possible to effectively prevent the amount of distortion from being increased due to excessive cooling, where the cooling rate is increased at a portion that was originally an appropriate cooling rate.

Here in order to satisfactorily localized cooling the maximum temperature site, it is desirable that the distance L ₂ from the surface of the mold 12 to the discharge port 22a of compressed air for cooling is discharged within 500 mm, also the cooling capacity It is desirable that the heat transfer coefficient is 80 W / m · k or more when the surface temperature of the mold 12 is 800 ° C.

  Further, in the present embodiment, the nozzle 22 for local cooling is held at the tip portion 38 of the movable arm 36 that can move in the three-dimensional direction, so that the portion approaching the mold 12 that becomes extremely hot can be moved to the movable arm. It is possible to limit to the tip portion 38 of the 36 and the nozzle 22 attached thereto, and the drive mechanism or the like that does not have sufficient heat resistance among the configurations required for local cooling is removed from the mold 12 as much as possible. Separated arrangements can be made.

  Further, in this embodiment, since the temperature of the highest temperature part can be accurately known by the infrared camera 24, these detected temperatures and the detected temperature of the highest temperature part are set to the appropriate scheduled surface temperature scheduled in advance. The cooling condition can be controlled based on the difference from the planned surface temperature.

Further, the cooling treatment method of the present embodiment, that is, the mold 12 is allowed to cool in the air atmosphere, the temperature distribution on the surface of the mold 12 is detected, the highest temperature portion on the surface of the mold 12 is specified, and the highest temperature According to the cooling processing method in which the local cooling nozzle 22 is moved to the vicinity of the part and the highest temperature part is locally cooled by the cooling compressed air discharged from the nozzle 22, the entire mold 12 is allowed to cool. Can suppress the distortion that occurs during the cooling process, but the highest temperature portion of the surface of the mold 12 is locally cooled by separately blowing compressed air, so that it is good for poor quenching due to the slow cooling rate. Can be prevented.
In particular, it is preferable to perform local cooling on the back surface 12b of the mold 12 serving as a reference surface during mounting or machining.

  Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, an object other than a mold can be used as the object to be processed. It is also possible to provide an infrared camera on the opposite side of the object to be processed so that the temperature distribution can be detected on both sides of the object to be processed. Furthermore, it is possible to provide a local cooling nozzle on the opposite side of the object to be processed so that both sides of the object can be locally cooled. It is feasible in the form which added.

10 Cooling treatment equipment 12 Mold (object to be treated)
20 Robot 22 Nozzle (cooling means)
22a Discharge port 24 Infrared camera (temperature detection means)
30 Control part 36 Movable arm (movement means)
38 Front end portion 42 Thermal shield 46 Displacement detection sensor 48 First wall surface 49 Second wall surface

Claims (7)

A cooling processing facility for cooling the heated workpiece,
Temperature detection means for detecting the temperature distribution on the surface of the workpiece;
Cooling means for discharging the cooling gas from the discharge port to cool the surface of the object to be processed;
Moving means for holding the cooling means movably in position;
A control unit for controlling the operation of the facility,
A cooling processing facility characterized in that, by the control of the control unit, the cooling means is moved to the vicinity of the highest temperature portion on the surface of the workpiece to locally cool the highest temperature portion.   2. The cooling processing facility according to claim 1, wherein the moving means has a movable arm whose tip is movable in a three-dimensional direction, and the cooling means is held at the tip of the movable arm. .   3. The cooling processing facility according to claim 1, wherein the local cooling is performed in a state where the discharge port is located within 500 mm from the surface of the object to be processed.   4. The cooling processing equipment according to claim 1, wherein when the surface temperature of the object to be processed is 800 ° C., the heat processing coefficient has a cooling capacity of 80 W / m · k or more.   5. The control unit according to claim 1, wherein the controller detects the detected temperature and the scheduled temperature so that the detected temperature at the highest temperature portion by the temperature detecting unit is an appropriate scheduled surface temperature scheduled in advance. A cooling processing facility that controls cooling conditions based on a difference from a surface temperature. A method of cooling a heated workpiece,
The object to be treated is allowed to cool, the temperature distribution on the surface of the object to be treated is detected, the highest temperature part on the surface of the object to be treated is specified, and the cooling means is moved to the vicinity of the highest temperature part. A cooling processing method comprising: locally cooling the highest temperature portion with a cooling gas discharged from the cooling means.   In Claim 6, The said to-be-processed object is a metal mold | die provided with the flat back surface on the surface on the opposite side to a design surface, Comprising: The local cooling using the said cooling means is performed with respect to this back surface. Cooling treatment method.

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