Calculation device, calculation method, and hardening method

Abstract

To provide a calculation device capable of easily calculating an optimum range capable of reducing hardening distortion for an undetermined set value.SOLUTION: A calculation device (200) comprises a calculation section (2) which acquires any two or three of normal values among the following set values of: distance x1 [mm] from a lower nozzle to a center of a product to be processed, volume flow rate q1 [mm3 / s] of hardening oil injected from the lower nozzle, distance x2 [mm] from an upper nozzle to the center of the product to be processed, and volume flow rate q2 [mm3 / s] of the hardening oil injected from the upper nozzle, to calculate an optimum range of the rest of unconfirmed set values on the basis of 0<(q1 / (a1*a2))-(0.8*q2 / (a2*x2))<2.9 when a sectional area of the lower nozzle is a1 [mm2], and a sectional area of the upper nozzle is a2[mm2].SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a calculation device, a calculation method, and a hardening method relating to a hardening process. [Background technology]

[0002] As a technique for reducing quenching distortion, for example, Patent Document 1 discloses a quenching method in which a specific oil is used and the ranges of the oil temperature and stirring speed are specified. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-269535 Summary of the Invention [Problem to be solved by the invention]

[0004] In hardening using a hardening device, a conventional method is to adjust the injection speed of the hardening oil into the oil tank to an appropriate value to reduce hardening distortion, but this adjustment is made by trial and error based on the engineer's experience and intuition. [Means for solving the problem]

[0005] In order to solve the above problems, a calculation device according to one aspect of the present invention is a calculation device that calculates an optimal range of undetermined set values ​​among a plurality of set values ​​used in a quenching device that performs quenching on a workpiece, the plurality of set values ​​being a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank in which the quenching oil is stored to the center of the workpiece, a volumetric flow rate of the quenching oil sprayed from the lower nozzle q1 [mm 3 / s], x2 [mm], which is the distance from the upper nozzle that sprays the quenching oil downward from above the oil tank, to the center of the workpiece, and q2 [mm], which is the volumetric flow rate of the quenching oil sprayed from the upper nozzle.3 / s], and the calculation device includes a calculation unit that calculates the optimal range, and the calculation unit acquires any two or three of the set values ​​as specified values, and calculates the cross-sectional area of ​​the lower nozzle as a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 ] and calculate the optimal range of the remaining undetermined setting values ​​based on the following formula (1).

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[0006] A calculation method according to one aspect of the present invention is a calculation method in which a calculation device calculates an optimal range of undetermined set values ​​among a plurality of set values ​​used in a quenching device that performs quenching on a workpiece, the plurality of set values ​​being a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank in which the quenching oil is stored to the center of the workpiece, a volumetric flow rate of the quenching oil sprayed from the lower nozzle q1 [mm 3 / s], x2 [mm], which is the distance from the upper nozzle that sprays the quenching oil downward from above the oil tank, to the center of the workpiece, and q2 [mm], which is the volumetric flow rate of the quenching oil sprayed from the upper nozzle. 3 / s], and acquiring any two or three of the set values ​​as specified values; and setting the cross-sectional area of ​​the lower nozzle to a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 and calculating an optimal range for the remaining undetermined setting values ​​based on the above formula (1) as the optimal range for the remaining undetermined setting values.

[0007] A quenching method according to one aspect of the present invention is a quenching method for performing quenching on a workpiece using a quenching device, the quenching method comprising: a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank in which the quenching oil is stored to the center of the workpiece; and a volumetric flow rate q1 [mm] of the quenching oil sprayed from the lower nozzle. 3 / s], x2 [mm], which is the distance from the upper nozzle that sprays the quenching oil downward from above the oil tank, to the center of the workpiece, and q2 [mm], which is the volumetric flow rate of the quenching oil sprayed from the upper nozzle. 3 / s] as specified values; and setting the cross-sectional area of ​​the lower nozzle to a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 ] based on the above formula (1), calculating an optimal range for the remaining undetermined setting values; and performing hardening processing of the workpiece in the hardening device using the two or three specified values ​​and the setting values ​​within the calculated optimal range. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to easily calculate an optimal range for reducing hardening distortion for undetermined setting values ​​among setting values ​​set in hardening using a hardening device. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a basic configuration of a hardening device according to an embodiment of the present disclosure. FIG. [Diagram 2] FIG. 2 is a block diagram showing a functional configuration of a calculation device according to an embodiment of the present disclosure. [Diagram 3] FIG. 2 is a schematic view showing an oil tank during quenching of a workpiece as seen from the side. [Figure 4] 4 is a flowchart illustrating an example of a main operation of the calculation device. [Diagram 5] FIG. 2 is a schematic diagram showing the structure of a quenching device used in the test. [Figure 6] FIG. 2 is a perspective view of a helical gear as a workpiece used in the test. [Figure 7] FIG. 2 is a schematic diagram showing the structure of a quenching device used in the fluid analysis. [Figure 8] This is an analysis result showing the change over time in the temperature difference between the top and bottom surfaces when x1 = 175 mm. [Figure 9] This is an analysis result showing the change over time in the temperature difference between the top and bottom surfaces when x1 = 100 mm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Embodiment 1] An embodiment of the present disclosure will be described in detail below. The present disclosure relates to a calculation device, a calculation method, and a quenching method related to a quenching process of a workpiece P. The workpiece P according to the present disclosure may be made of a metal material and have a cylindrical or annular shape. For example, the workpiece P according to the present disclosure may be a gear such as a helical gear.

[0011] After various metal members are formed by casting or other processes, they are subjected to heat treatments such as quenching in order to improve mechanical properties such as strength. Generally, quenching is performed by immersing the workpiece P, which has been heated to the quenching temperature, in water or quenching oil stored in a tank and rapidly cooling it.

[0012] During quenching, quenching oil vapor remains on the bottom side of the cylindrical or annular workpiece P, and an upward flow occurs on the top side as the temperature of the quenching oil rises. This phenomenon creates a temperature difference between the top and bottom sides of the workpiece P, causing distortion of the workpiece P.

[0013] In order to reduce the temperature difference between the upper and lower surfaces of the workpiece P, which causes distortion, a conventional method is to adjust the settings such as the injection speed of the quenching oil into the oil tank to an appropriate value. However, this adjustment is performed by trial and error based on the experience and intuition of the engineer.

[0014] The present invention has an object to easily calculate an optimal range capable of reducing hardening distortion for undetermined setting values ​​among setting values ​​set in hardening using a hardening device.

[0015] <Quenching equipment> First, a quenching device according to one embodiment of the present invention will be described. Fig. 1 is a schematic diagram showing a basic configuration of a quenching device 100 according to one embodiment of the present invention. The quenching device 100 is a part of a heat treatment facility that continuously performs heat treatment on a workpiece P to be heat-treated, and is a device for quenching (rapidly cooling) the workpiece P.

[0016] The quenching device 100 includes an oil tank 10, a lower nozzle 12 for injecting quenching oil from below the oil tank 10 toward the top, and an upper nozzle 13 for injecting quenching oil from above the oil tank 10 toward the bottom. In addition, at the bottom of the quenching device 100, one or more outlets 14 for discharging the quenching oil from the oil tank 10 are provided. In FIG. 1, the outlets 14 are provided at the bottom of the quenching device 100. In FIG. 1, the lower nozzle 12 and the upper nozzle 13 have a cylindrical shape, but are not particularly limited and may have a prismatic shape. The cross-sectional area of ​​the outlet of the lower nozzle 12 and the upper nozzle 13 may be 5% or more and less than 120% of the bottom area of ​​the workpiece P. When multiple workpieces P are quenched, the multiple workpieces P may be accommodated in a quenching jig having holes through which the quenching oil can pass. In this case, the cross-sectional area of ​​the injection port of the lower nozzle 12 and the upper nozzle 13 may each be 5% or more and less than 120% of the area of ​​the entire bottom surface, including the holes, of the hardening jig.

[0017] During the quenching process of the workpiece P, the oil tank 10 is filled with quenching oil adjusted to a predetermined oil temperature. The quenching oil can be circulated in the oil tank 10 by ejecting the quenching oil from the upper nozzle 13 and / or the lower nozzle 12 while discharging it from the discharge port 14. The capacity of the oil tank 10 may be, for example, 64 L or more and 1500 L or less. In the quenching device 100, one discharge port 14 is provided on the lower surface of the oil tank 10, but the position and number of the discharge ports 14 are not particularly limited. The quenching oil used in this embodiment may be cold quench oil or hot quench oil. Specifically, the quenching oil used may be a cold quench oil or a hot quench oil. 2 / s or more 30mm 2 / s or less, or the kinetic viscosity at 100°C is 15mm 2 / s or more 30mm 2 / s or less.

[0018] The quenching apparatus 100 may have a holding unit (not shown) that holds the workpiece P at a predetermined position in the oil vat 10. The holding unit may be configured to be able to rise and fall within the oil vat 10.

[0019] When the workpiece P is quenched using the quenching device 100, the position of the workpiece P in the oil tank 10 and the injection speed of the quenching oil injected from the upper nozzle 13 and the lower nozzle 12 are adjusted in order to reduce the temperature difference between the upper and lower sides described above.

[0020] (Configuration of Calculation Device 200) Next, a description will be given of the configuration of the calculation device 200. Fig. 2 is a block diagram showing the functional configuration of the calculation device 200. Fig. 3 is a schematic diagram of the oil vat 10 during quenching of the workpiece P as seen through from the side.

[0021] The calculation device 200 calculates an optimum range for an undetermined set value among a plurality of set values ​​used in the hardening device 100. In this embodiment, the set values ​​used in the hardening device 100 are the following four.

[0022] (1) Distance x1 [mm] from the lower nozzle 12 to the center of the workpiece P (2) Distance from the upper nozzle 13 to the center of the workpiece P x2 [mm] (3) The volumetric flow rate q1 [mm 3 / s] (4) The volumetric flow rate of the quenching oil injected from the upper nozzle 13, q2 [mm 3 / s].

[0023] The calculation device 200 acquires two or three of the above set values ​​as default values, and calculates optimal ranges for the remaining undetermined set values. The default values ​​are, in other words, determined set values.

[0024] More specifically, x1 and x2 may be the distances from the tips (jet nozzles) of the lower nozzle 12 and the upper nozzle 13 to the center of the workpiece P. The tips of the lower nozzle 12 and the upper nozzle 13 may be in contact with the quenching oil, or a part of the tip side of the lower nozzle 12 and the upper nozzle 13 may be located in the quenching oil.

[0025] 2, the calculation device 200 includes a calculation unit 2 and a storage unit 3. The calculation device 200 according to this embodiment may further include an input unit 4 and an output unit 5.

[0026] The storage unit 3 may be configured with a non-volatile memory. The storage unit 3 according to this embodiment stores a calculation function F. The calculation function F is expressed by the following formula (1). The details of the calculation function F will be described later.

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[0027] Here, a1 in the above formula (1) is the cross-sectional area [mm 2 ], and a2 is the cross-sectional area of ​​the upper nozzle 13 [mm 2

[0046] where a1 and a2 are constants determined according to the hardening apparatus 100. The values ​​of a1 and a2 may be stored in the storage unit 3 as cross-sectional area information, or may be input by a user via the input unit 4. Alternatively, the storage unit 3 may store, as the calculation function F, the formula (1) into which the values ​​of a1 and a2 are substituted in advance.

[0028] Furthermore, the storage unit 3 may store the distance h [mm] between the lower nozzle 12 and the upper nozzle 13 of the quenching device 100 as nozzle distance data.

[0029] The input unit 4 is operated by a user. The input unit 4 may include, for example, a keyboard, a mouse, a touch panel, etc. The user inputs information about the specified value via the input unit 4. The input unit 4 may transmit the specified value input by the user's operation to the calculation unit 2. The specified value may be a set value determined to an arbitrary value by the user, or may be a set value determined based on the design conditions or operating conditions of the hardening apparatus 100.

[0030] The output unit 5 outputs the calculation results of the calculation unit 2. The output unit 5 may include a display device that displays the calculation results, a printer that prints the calculation results, a communication module that transmits data of the calculation results to another device, and the like.

[0031] The calculation unit 2 acquires any two or three of the setting values ​​as specified values, and calculates an optimal range for the remaining undetermined setting values. Specifically, the calculation unit 2 acquires a calculation function F stored in the storage unit 3, and substitutes the confirmed setting values ​​acquired from the input unit 4 into the calculation function F to calculate an optimal range for the remaining undetermined setting values.

[0032] (Example of main operations of the calculation device 200) Next, a specific example of the main operation of the calculation device 200 will be described. Fig. 4 is a flowchart illustrating an example of the main operation of the calculation device 200. The flowchart shown in Fig. 4 is an example, and the steps are not limited to being arranged in the above-mentioned order.

[0033] The calculation unit 2 of the calculation device 200 acquires the calculation function F from the storage unit 3 (step S1). When the calculation function F is the above formula (1), the calculation unit 2 may acquire the calculation function F and the values ​​of a1 and a2 from the storage unit 3. Alternatively, the calculation unit 2 may acquire, as the calculation function F, the above formula (1) into which the values ​​of a1 and a2 are substituted in advance.

[0034] Next, the calculation unit 2 acquires the specified values ​​input by the user via the input unit 4 (step S2). If the specified values ​​include x1 and x2, or q1 and q2, the calculation unit 2 acquires three specified values ​​in step S2. Alternatively, if the specified value is a combination of either x1 or x2 and either q1 or q2, the calculation unit 2 acquires two specified values ​​in step S2.

[0035] Next, the calculation unit 2 substitutes the specified value acquired in step S2 into the calculation function F to calculate the range of the remaining setting values ​​(step S3).

[0036] If the number of specified values ​​acquired in step S2 is three, the calculation unit 2 substitutes the three specified values ​​into the calculation function F to calculate the range of the remaining setting values.

[0037] When the number of the specified values ​​acquired in step S2 is two, the calculation unit 2 can calculate the range of the remaining set values ​​as follows. For example, when the set values ​​are x1 and q1, the calculation unit 2 acquires nozzle-to-nozzle distance data indicating the distance h [mm] between the lower nozzle 12 and the upper nozzle 13 from the storage unit 3, and calculates x2 from the nozzle-to-nozzle distance data and x1. After that, the calculation unit 2 calculates the range of q2, which is the remaining specified value, by substituting x1 and q1 acquired in step S2 and the calculated x2 into the calculation function F. When either x1 or x2 and either q1 or q2 are set values ​​among the four set values, any combination can be calculated in the same way.

[0038] That is, the calculation unit 2 acquires two or three of the setting values ​​as default values, and calculates the range of the remaining undetermined setting values.

[0039] [Software implementation example] The functions of the calculation device 200 can be realized by a program for causing a computer to function as the calculation device 200 and as the calculation unit 2.

[0040] In this case, the calculation device 200 includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program to realize each function described in the above embodiment.

[0041] The program may be non-transitory and may be recorded in one or more computer-readable recording media, which may or may not be included in the computing device 200. In the latter case, the program may be provided to the device via any wired or wireless transmission medium.

[0042] Also, some or all of the functions of the calculation unit 2 can be realized by a logic circuit. For example, the scope of the present invention includes an integrated circuit in which a logic circuit that functions as the calculation unit 2 is formed. In addition, the functions of the calculation unit 2 can also be realized by, for example, a quantum computer.

[0043] (About the calculation function F) The calculation function F (equation (1)) used in the above-mentioned calculation device 200 was created by the inventors based on findings from the results of the following tests and simulations.

[0044] (Tooth line deformation test) First, a tooth trace deformation test was conducted to determine the temperature difference (lower surface temperature - upper surface temperature) between the upper and lower surfaces of the workpiece P that can reduce hardening distortion. Fig. 5 is a schematic diagram showing the structure of the hardening device 100A used in the test. Fig. 6 is a perspective view of a helical gear as the workpiece P used in the test. The test was conducted under the following conditions.

[0045] Workpiece: 1 helical gear (φ110mm x H50mm, module 5, steel type S45C) Quenching temperature: 850℃ (workpiece) → 80℃ (oil temperature) Injection nozzle diameter: φ28mm (cross-sectional area a1 = 616mm 2 ) Discharge nozzle diameter: φ28mm Oil characteristic temperature: 600℃ Oil kinematic viscosity (40℃): 16.9mm 2 / s Oil thermal conductivity (100℃): 0.134W / m·K Specific heat of oil (100℃): 2223J / kg K Oil tank size: W440mm x D440mm x H600mm Height from bottom to oil level: 465mm Oil amount: 90L Distance between bottom nozzle and outlet: 200mm Distance from the lower nozzle to the center of the workpiece P (x1): 175 mm Jet flow rate (q1): 0 (no jet), 61600, 154000, 308000, 46200, 616000 mm 3 / s Injection flow velocity (q2): 0mm 3 / s.

[0046] If q1 is too small, the steam film on the bottom surface cannot be completely removed, and the temperature drop on the bottom surface is suppressed, resulting in quenching distortion. On the other hand, if q1 is too large, the bottom surface is excessively cooled, resulting in quenching distortion. The above test showed that, compared to the case of q1=0, the steam film on the bottom surface is not completely removed, resulting in quenching distortion. 3 It was confirmed that the deformation of the tooth trace was suppressed in the case of / s.

[0047] (Fluid analysis) Next, a fluid analysis was performed to examine the temperature range in which the quenching distortion can be reduced. Fig. 7 is a schematic diagram showing the structure of a quenching device 100B used in the fluid analysis. The fluid analysis was performed under the following conditions.

[0048] Workpiece: Cylindrical steel column (φ110mm x H50mm, physical properties: Steel) Quenching temperature: 850℃ (workpiece) → 80℃ (oil temperature) Injection nozzle diameter: φ28mm (common to upper and lower parts: cross-sectional area a1, a2 = 616mm2 ) Discharge nozzle diameter: φ28mm Oil kinematic viscosity (40℃): 27.4mm 2 / s Oil thermal conductivity (100℃): 0.42W / m·K Specific heat of oil (100℃): 2150J / kg K Analysis software: ANSYS Fluent Turbulence calculation model: SST k-ω model Unsteady calculation Number of calculation meshes: 2,360,000 meshes Oil tank size: W450mm x D450mm x H600mm Oil amount: 122L Distance between bottom nozzle and outlet: 200mm Distance from the lower nozzle to the center of the workpiece P (x1): 100, 175, 300, 425, 500 mm Distance from the upper nozzle to the center of the workpiece P (x2): 600mm-x1 Injection flow rate (q1, q2): 0, 61600, 154000, 308000, 462000, 616000, 770000mm 3 / s.

[0049] Figure 8 shows the analysis results showing the change over time in the temperature difference (lower surface temperature - upper surface temperature) between the upper and lower surfaces for each jet flow velocity when x1 = 175 mm, the same as the condition for the tooth trace deformation test described above. In the graph of Figure 8, each line indicates the following jet flow velocities (mm 3 / s) are shown: (a) q1 = 0, (b) q1 = 61600, (c) q1 = 154000, (d) q1 = 308000, (e) q1 = 462000. Taking into consideration the results of the tooth trace deformation test described above, the temperature range in which deformation can be reduced was set to be -120°C or more and 65°C or less, which is smaller than the maximum temperature difference (approximately 70°C) for q1 = 0 and larger than the maximum temperature difference (approximately -122°C) for q1 = 462000.

[0050] Figure 9 shows the analysis results showing the change over time in the temperature difference between the top and bottom surfaces for each jet flow velocity when x1 = 100 mm. The jet flow velocities shown by the lines in the graph in Figure 9 are the same as those in Figure 8.

[0051] From the graph in FIG. 9, it can be seen that the injection flow velocities at which the maximum temperature difference falls within the temperature range capable of reducing deformation are (b) and (c).

[0052] It is clear that the cooling of the workpiece is influenced by the injection of quenching oil, which contributes greatly to the temperature difference between the top and bottom surfaces. Here, the inventors have found through extensive research that the following formula (2) can be used as an evaluation formula for evaluating the injection that affects cooling. In formula (2), x1, x2, q1, q2, a1, and a2 are as defined above.

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[0053] The evaluation formula (2) takes into consideration the injection speed, the distance between the injection nozzle and the workpiece, the influence of the upward flow of the workpiece information, etc. The value obtained by substituting x1, x2, q1, q2, a1, and a2 into formula (2) is called the evaluation value.

[0054] It was verified whether the evaluation formula (2) and the evaluation value obtained from the evaluation formula (2) can be used as a parameter of the temperature difference between the upper and lower surfaces. Tables 1 to 6 below show the respective set values ​​(x1, x2, q1, q2) and a1, a2 = 616 mm 2 1 is a table showing the calculation results (evaluation values) obtained by substituting the above into evaluation formula (2). In the table, the shaded areas indicate conditions where the maximum temperature difference was within the range of -120°C to 65°C as a result of a simulation using fluid analysis. In the table, the values ​​shown in bold are evaluation values ​​that satisfy 0<evaluation value<2.9. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] [Table 6]

[0055] From Tables 1 to 6, it has been demonstrated that there is a very good relationship between the temperature difference between the top and bottom surfaces and the evaluation value, and that if the condition 0<evaluation value<2.9 is satisfied, the maximum temperature difference falls within the range of approximately -120°C to 65°C. Also, the condition for the set value capable of reducing hardening distortion obtained from the actual tooth trace deformation test in Table 1 is within the range of 0<evaluation value<2.9.

[0056] From the above, it has been demonstrated that the condition satisfying the above formula (1) is appropriate as a condition for reducing quenching distortion.

[0057] (summary) (1) A calculation device according to a first aspect of the present disclosure is a calculation device that calculates an optimal range of undetermined set values ​​among a plurality of set values ​​used in a quenching device that performs quenching on a workpiece, the plurality of set values ​​being a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank in which the quenching oil is stored to the center of the workpiece, a volumetric flow rate of the quenching oil sprayed from the lower nozzle q1 [mm 3 / s], x2 being the distance from an upper nozzle that sprays quenching oil downward from above the oil tank to the center of the workpiece, and q2 being the volumetric flow rate of the quenching oil sprayed from the upper nozzle; the calculation device includes a calculation unit that calculates the optimal range, and the calculation unit acquires any two or three of the set values ​​as specified values, and calculates the cross-sectional area of ​​the lower nozzle as a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 ] and calculate the optimal range of the remaining undetermined setting values ​​based on the above formula (1).

[0058] The calculation device of the first aspect can easily calculate an optimal range for reducing hardening distortion for undetermined setting values ​​among the setting values ​​set in hardening using a hardening device.

[0059] (2) A calculation device according to a second aspect of the present disclosure is the above-mentioned first aspect, wherein the capacity of the oil tank is 64 L or more and 1500 L or less.

[0060] The calculation device of aspect 2 can easily calculate an optimal range that can reduce hardening distortion for undetermined setting values ​​among the setting values ​​that are set in hardening using a hardening device equipped with an oil tank having a capacity of 64 L or more and 1500 L or less.

[0061] (3) A calculation device according to a third aspect of the present disclosure is the calculation device according to the first or second aspect, wherein the object to be processed has a cylindrical or annular shape.

[0062] In a cylindrical or annular workpiece having a flat surface on the bottom, the vapor film generated during quenching tends to accumulate on the bottom surface. By using the calculation device of the third aspect, even when a cylindrical or annular workpiece is quenched using a quenching device, it is possible to easily calculate an optimal range that can reduce quenching distortion for undetermined setting values ​​among the set values.

[0063] (4) In a calculation device of a fourth aspect according to the present disclosure, in any one of the above first to third aspects, the workpiece is a gear. When a gear is hardened using a hardening device, the calculation device of the fourth aspect can easily calculate an optimal range for reducing tooth lead bending for undetermined setting values ​​among the set setting values.

[0064] (5) In the calculation device of aspect 5 according to the present disclosure, in any one of aspects 1 to 4, the quenching oil has a kinetic viscosity of 15 mm at 40° C. 2 / s or more 30mm 2 / s or less, or the kinetic viscosity at 100°C is 15mm 2 / s or more 30mm 2 / s or less.

[0065] The effectiveness of the above formula (1) has been verified by a test using a quenching oil classified as a cold quenching oil, which is generally considered to be prone to quenching distortion. By using the calculation device according to the fifth aspect, it is possible to easily calculate an appropriate range in which quenching distortion can be reduced in quenching using the above quenching oil, which is within the range of cold quenching oil and hot quenching oil.

[0066] (6) A calculation program of aspect 6 according to the present disclosure is a calculation program for causing a computer to function as the calculation device according to any one of aspects 1 to 5 above, and is a calculation program for causing a computer to function as the calculation unit.

[0067] The calculation program of the sixth aspect makes it possible to easily calculate the optimum range of undetermined setting values ​​among the setting values ​​set in hardening using a hardening device.

[0068] (7) A calculation method according to a seventh aspect of the present disclosure is a calculation method in which a calculation device calculates an optimal range of undetermined set values ​​among a plurality of set values ​​used in a quenching device that performs quenching treatment on a workpiece, the plurality of set values ​​being a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank in which the quenching oil is stored to the center of the workpiece, a volumetric flow rate of the quenching oil sprayed from the lower nozzle q1 [mm 3 / s], x2 [mm], which is the distance from the upper nozzle that sprays the quenching oil downward from above the oil tank, to the center of the workpiece, and q2 [mm], which is the volumetric flow rate of the quenching oil sprayed from the upper nozzle. 3 / s], and acquiring any two or three of the set values ​​as specified values; and setting the cross-sectional area of ​​the lower nozzle to a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 and calculating an optimal range for the remaining undetermined setting values ​​based on the above formula (1) as the optimal range for the remaining undetermined setting values.

[0069] According to the calculation method of the seventh aspect, when hardening is performed using a hardening device, it is possible to easily calculate an optimal range in which hardening distortion can be reduced for undetermined setting values ​​among the setting values ​​that are set.

[0070] (8) A quenching method according to an eighth aspect of the present disclosure is a quenching method for performing quenching on a workpiece using a quenching device, the quenching method comprising: a distance x1 [mm] from a lower nozzle that sprays quenching oil from below to above an oil tank storing the quenching oil to the center of the workpiece; and a volumetric flow rate q1 [mm 3 / s], x2 [mm], which is the distance from the upper nozzle that sprays the quenching oil downward from above the oil tank, to the center of the workpiece, and q2 [mm], which is the volumetric flow rate of the quenching oil sprayed from the upper nozzle. 3 / s] as specified values; and setting the cross-sectional area of ​​the lower nozzle to a1 [mm 2 ], the cross-sectional area of ​​the upper nozzle is a2 [mm 2 ] based on the above formula (1), calculating an optimal range for the remaining undetermined setting values; and performing hardening processing of the workpiece in the hardening device using the two or three specified values ​​and the setting values ​​within the calculated optimal range.

[0071] According to the quenching method of the eighth aspect, when quenching is performed using a quenching device, it is possible to easily calculate an optimal range that can reduce quenching distortion for undetermined setting values ​​among the set values.

[0072] (Additional Notes) The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0073] 100, 100A, 100B...Quenching device 10...oil tank 12. Bottom nozzle 13. Upper nozzle 14...Discharge port 200... Calculation device 2. Calculation section 3...Storage section 4. Input section 5. Output section

Claims

1. A calculation device for calculating an optimal range of an undetermined set value among a plurality of set values ​​used in a hardening device for performing a hardening process on a workpiece, the calculation device comprising: The plurality of setting values ​​are x is the distance from a lower nozzle that sprays quenching oil from the bottom to the top of an oil tank in which the quenching oil is stored to the center of the workpiece; １ [mm], The volumetric flow rate of the quenching oil injected from the lower nozzle is q １ [mm ３ / s], x is the distance from the upper nozzle that sprays quenching oil downward from the top of the oil tank to the center of the workpiece. ２ [mm], and The volumetric flow rate of the quenching oil injected from the upper nozzle is q ２ [mm ３ / s], The calculation device includes a calculation unit that calculates the optimal range, The calculation unit acquires any two or three of the set values ​​as specified values, The cross-sectional area of ​​the lower nozzle is a １ [mm ２ ], the cross-sectional area of ​​the upper nozzle is a ２ [mm ２ ] as A calculation device that calculates optimal ranges for the remaining undetermined setting values ​​based on the following formula (1). [0010]

2. The calculation device according to claim 1 , wherein the capacity of the oil tank is equal to or greater than 64 L and equal to or less than 1500 L.

3. The calculation device according to claim 1 , wherein the object to be processed has a cylindrical or annular shape.

4. The calculation device according to claim 3 , wherein the object is a gear.

5. The quenching oil has a kinetic viscosity of 15 mm at 40°C. ２ / s or more 30mm ２ / s or less, or a kinetic viscosity at 100°C of 15 mm ２ / s or more 30mm ２ 2. The calculation device of claim 1 , wherein the Δt is equal to or less than 1 / s.

6. A calculation program for causing a computer to function as the calculation device according to claim 1, the calculation program causing a computer to function as the calculation unit.

7. A calculation method in which a calculation device calculates an optimal range of an undetermined set value among a plurality of set values ​​used in a hardening device that performs a hardening process on a workpiece, the method comprising: The plurality of setting values ​​are x is the distance from a lower nozzle that sprays quenching oil from the bottom to the top of an oil tank in which the quenching oil is stored to the center of the workpiece; １ [mm], The volumetric flow rate of the quenching oil injected from the lower nozzle is q １ [mm ３ / s], x is the distance from the upper nozzle that sprays quenching oil downward from the top of the oil tank to the center of the workpiece. ２ [mm], and The volumetric flow rate of the quenching oil injected from the upper nozzle is q ２ [mm ３ / s], acquiring any two or three of the set values ​​as default values; The cross-sectional area of ​​the lower nozzle is a １ [mm ２ ], the cross-sectional area of ​​the upper nozzle is a ２ [mm ２ and calculating an optimal range for the remaining undetermined setting values ​​based on the following formula (1): [0025]

8. A quenching method for performing quenching on a workpiece using a quenching device, comprising the steps of: x is the distance from a lower nozzle that sprays quenching oil from the bottom to the top of an oil tank in which the quenching oil is stored to the center of the workpiece; １ [mm], The volumetric flow rate of the quenching oil injected from the lower nozzle is q １ [mm ３ / s], x is the distance from the upper nozzle that sprays quenching oil downward from the top of the oil tank to the center of the workpiece. ２ [mm], and The volumetric flow rate of the quenching oil injected from the upper nozzle is q ２ [mm ３ / s] as default values; The cross-sectional area of ​​the lower nozzle is a １ [mm ２ ], the cross-sectional area of ​​the upper nozzle is a ２ [mm ２ ] based on the following formula (1), calculating an optimal range of the remaining undetermined setting values; performing a quenching process on the workpiece in the quenching device using the two or three specified values ​​and a set value within the calculated optimal range; The hardening method includes: [0030]

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