JPH081398A - Method for maintaining die height in press - Google Patents

Abstract

PURPOSE:To provide a method for maintaining a die height at a prescribed value even if a change occurs to the operation of a press including a temporary stoppage. CONSTITUTION:Operating conditions preliminarily set in an experiment, for example, and a range of plural allowable temp. corresponding to the outside temp. are stored in a part 24 for storing the allowable temp. range in the control device 23; and, in the case of operation stoppage of a press 1, the storage part 24 is retrieved by a part 25 for selecting the allowable temp. range, and the allowable temp. range TU, TL is selected corresponding to the current operating conditions DM from a console 20 and to the outside temp. TC from an outside temp. sensor 19. Heaters 21, 22 are controlled at a part 26 for controlling heat supply so as to correspond to this allowable temp. range; and the temp. on the upper end of the connecting rod and the journal part of the crank shaft are maintained within the prescribed range, suppressing the occurrence of a change in the die height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range.

[0002]

BACKGROUND ART In a press machine, the die height, which is the distance between the slide bottom surface and the bolster top surface when the slide reaches bottom dead center, is the die height used when producing high-precision products such as laminated cores and lead frames. Since it has a great influence on the processing accuracy, it is accurately adjusted to a predetermined value that provides a good processing state.

However, in the sliding portion such as the connecting portion between the crankshaft for driving the slide and the connecting rod, heat generation due to operation is inevitable. When such operating heat is generated, the temperature of the sliding portion or the surroundings gradually rises due to the accumulation, and the dimensions of each portion change due to thermal expansion, so that the die height cannot be maintained at a predetermined value.

On the other hand, by applying oil controlled to a constant temperature to the connecting rod, the temperature change is suppressed,
A conventional technique for keeping the die height constant is known (Japanese Patent Publication No. 1-30569). In this conventional technique, for example, when the temperature is high in summer or the like, the cooled oil is applied to the connecting rod, and when the temperature is low in the winter or the like, heated oil is applied to the connecting rod, whereby the temperature of the connecting rod can be made constant. To do so.

[0005]

By the way, in the operation of the press machine, the operation is temporarily stopped for the purpose of material replacement or product removal. During the temporary stop of operation, the operating heat generation in the above-mentioned sliding portion also stops. However, since natural heat radiation according to the difference from the outside temperature is not stopped, the temperature of the sliding portion and the surroundings gradually decreases with the passage of time during the stop.

That is, when the press machine is temporarily stopped, there is a problem that the dimensional change occurs in the connecting rod or the like due to the temperature decrease and the die height also changes from a predetermined value. . Then, if the press operation is restarted after the die height is changed after the suspension for a predetermined time, there is a problem that a product with a predetermined accuracy cannot be obtained. Such a problem is based on the state change between the steady operation and the temporary stop, and is also solved by the above-described conventional technique for keeping the temperature of the connecting rod constant in the operating state by supplying the oil of the constant temperature. I couldn't.

An object of the present invention is to provide a die height holding method for a press machine that can hold the die height at a predetermined value even when there is a change in the operating state including a temporary stop of the operation of the press machine.

[0008]

The present invention is a die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range, and detects the temperature of a predetermined heat generating portion of the press machine. A heat generating part temperature sensor, a heat supplying means for heating and / or cooling the heat generating part, an external temperature input part for inputting the temperature outside the press machine, and an operation for inputting operating conditions of the press machine. A condition input unit and a permissible temperature range storage unit in which a plurality of permissible temperature ranges are stored in advance for each combination of the operating conditions of the press machine and the external temperature are provided, and the permissible temperature range storage unit is referred to for the external temperature range. Select the current external temperature input to the temperature input section and the current allowable temperature range corresponding to the current operating conditions input to the operating condition input section, and select the heat generating part temperature. When the current heat-generating portion temperature detected by the sensor is out of the current allowable temperature range, the heat supply means is operated, and the heat amount is controlled so that the heat-generating portion temperature falls within the current allowable temperature range. Characterize.

The present invention also provides a die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range between the temporary stoppage of operation of the press machine and the restart of the operation. A heat generating portion temperature sensor for detecting a temperature of a predetermined heat generating portion of the press machine and a heat supply means for heating the heat generating portion are provided, and the heat generating portion temperature sensor detects the temperature of the heat generating portion when the operation is stopped. Detects the temperature, sets an allowable temperature range of a predetermined width based on this temperature, from the operation stop until the operation restart,
The temperature of the heat generating portion is detected by the heat generating portion temperature sensor, and when the temperature is out of the allowable temperature range, the heat supply means is operated so that the heat generating portion temperature falls within the current allowable temperature range. It is characterized by heating to.

Further, the present invention relates to a die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range between the temporary stoppage of the operation of the press machine and the restart of the operation. A heat supply means for heating a predetermined heat generating portion of the press machine, an external temperature input section for inputting an external temperature of the press machine, and an operating condition input section for inputting operating conditions of the press machine, A compensation heat quantity storage unit is previously provided in which a plurality of compensation heat quantities to be supplied to the heat generating portion while the press machine is stopped are stored for each combination of the operating conditions of the press machine and the external temperature, and the operation is started from the operation stop. Until the restart, the compensation heat quantity storage unit is referred to, and the current external temperature input to the external temperature input unit and the current operating condition input to the operating condition input unit are referred to. Compensation amount of heat is selected, characterized in that to perform the heating corresponding to the compensation amount of heat to the heating portion from the heat supply means.

In the above, as the heat generating portion, for example, a sliding portion such as a connecting portion between the crankshaft and the connecting rod and a journal portion of the crankshaft, a column which generates heat by transmitting heat accompanying the operation of the sliding portion, and the like. Includes parts that affect die height, such as tie rods. As the heat supply means, a heating means such as a heater is provided in an oil supply circuit for oil to be applied to or injected into the sliding part, a sliding part or a heating wire embedded in the vicinity thereof, or a sliding part. Radiant heating or electromagnetic induction heating may be used, and its type is arbitrary.

The operating condition of the press machine is the cycle speed of the press operation, etc., and the operating condition input section includes an operation console which can be manually operated from the outside or a device for controlling the operation of the press machine. For example, communication means for reading the operating conditions set in these can be used. The external temperature is the external temperature of the environment in which the press machine is placed, and the external temperature input unit may be a temperature sensor or the like for detecting the external temperature, or one that inputs the temperature value from the operation console.

Further, as the allowable temperature range storage unit or the compensation heat amount storage unit, a data table method in which data such as the allowable temperature range and the compensation heat amount is matrixed as operating conditions and external temperature as search items, and each data is in an operating state. And a function method set as a function of the external temperature, or a combination thereof can be used. Here, the data such as the allowable temperature range and the amount of compensation heat may be set in each storage unit by being calculated in advance for each combination of the operating condition and the external temperature by experiments or the like. And refer to each storage unit,
Selection of corresponding data, control of the heat supply means, and the like can be realized by dedicated hardware or software executed by a computer system.

[0014]

According to the present invention as described above, the heating portion is heated and cooled based on the allowable operating temperature range selected from the allowable temperature range storing section and the external temperature, which is suitable for the external operating temperature. Die height fluctuation due to temperature fluctuation can be eliminated.For example, even when the operation is temporarily stopped and the temperature drops, the temperature of the heat generating portion is maintained within a predetermined range by heating from the heat supply means, and the die height is set to a predetermined value. Will be held at the value of.

Further, by setting an allowable temperature range based on the temperature immediately before or immediately after the temporary stop of the heat generating part and controlling the temperature of the heat generating part based on this allowable temperature range during the temporary stop, the heat generating part is temporarily stopped. The temperature at the time of stop is maintained, and the die height is also maintained at a predetermined value.

Further, the heat quantity of the heat generating portion is controlled on the basis of the compensation heat quantity according to the current operating condition and the external temperature selected from the compensation heat quantity storage section, so that the heat is radiated to the outside while the operation is temporarily stopped. The amount of heat is compensated, the temperature of the heat generating portion is maintained within a predetermined range, and the die height is maintained at a predetermined value.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. In FIG. 1, a slide 4 is connected to a crankshaft 2 of a press machine 1 via a connecting rod 3, and an upper die 5 attached to the slide 4 when the crankshaft 2 rotates.
And the lower mold 7 attached to the bolster 6 are separated from each other,
In the meantime, the material is pressed. The press machine 1 is provided with a lubricating oil unit 8.

The lubricating oil unit 8 has an oil tank and a hydraulic pump, and the lubricating oil from this lubricating oil unit 8 is supplied to the journal portion 2A of the crankshaft 2 supported by the bearing 10 via the oil supply circuit 9. Oil supply circuit 12
It is adapted to be supplied to the oil spraying member 13 via.
The oil spraying member 13 is arranged above the connecting portion between the crankshaft 2 and the connecting rod 3, that is, above the upper end portion of the connecting rod 3.
The oil from the oil spraying member 13 is applied to the upper end portion of the connecting rod 3. The oils supplied to the journal portion 2A and the upper ends of the connecting rods 3 are returned to the lubricating oil unit 8 via the oil reservoirs in the bed 14, respectively.

The lubricating oil unit 8 has a heat exchange unit 11
Is connected. The heat exchange unit 11 has an oil tank, a heater, a cooler, and a hydraulic pump, heats or cools the oil in the lubricating oil unit 8, and supplies the oil supplied from the oil supply circuit 9 to the journal section 2A and the oil supply. The temperature of the oil sprayed from the circuit 12 to the connecting rod 3 through the oil spraying member 13 is adjusted to be constant.

The upper end of the connecting rod 3 and the crankshaft 2
The journal portion 2A is a heat generating portion that generates sliding heat with operation, and the heat generating portion temperature sensor 17,
18 are arranged. The upper end portion of the connecting rod 3 and the journal portion 2A of the crankshaft 2 which are these heat generating portions
As the heat supply means for heating the oil, the oil supply circuits 9 and 12
Are provided with electric heaters 21 and 22. Further, an external temperature sensor 19 that detects an external temperature (air temperature around the press machine 1) is installed as an external temperature input unit near the outside of the press machine 1.

These heat generating part temperature sensors 17, 18,
The external temperature sensor 19 and the heaters 21 and 22 are connected to the control device 23, respectively. In addition, the control device 2
A console 20 is connected to 3 for inputting operations and outputting displays. The console 20 also serves as an operating condition input means and can input what operating conditions are currently set in the press machine 1.

The control device 23 is shown in FIG. The control device 23 is configured by a so-called microcomputer system or the like, and has an allowable temperature range storage unit 24.
And an allowable temperature range selection unit 25 and a heat supply control unit 26. The allowable temperature range storage unit 24 is a data table stored in a storage unit such as a semiconductor memory.

As shown in FIG. 3, the allowable temperature range storage unit 2
Reference numeral 4 designates operating conditions DM1, DM2, ... Including items such as cycle speed of the press machine 1 as operating condition keys 241, external temperatures TC1, TC2 ... As external temperature keys 242, and allowable temperatures corresponding to the respective keys 241, 242. Range data 24
3 is stored in a matrix form into a data table, and the corresponding allowable temperature range data 243 can be retrieved from each key 241 and 242 at any time.

The permissible temperature range data 243 includes the upper limit value TU11 and the lower limit value TL of the temperature allowed in the heat generating portions (the journal portion 2A and the upper end portion of the connecting rod 3).
Each data set is set by conducting experiments or simulations in advance. For example, the upper limit value TU11 and the lower limit value TL11 are set as the temperature range of the heat generating portion such that the die height falls within an appropriate range when operating under the operating condition DM1 under the external temperature TC1.

The allowable temperature range selector 25 is constructed by utilizing an existing condition retrieval routine or the like, and the current operating condition DM of the press machine 1 inputted from the console 20 and the current temperature detected by the external temperature sensor 19. The allowable temperature range storage unit 24 is searched on the basis of the external temperature TC and the upper limit value TU and the lower limit value TL of the allowable temperature range corresponding to the current press machine 1.
Is selected and output to the heat supply control unit 26.

The heat supply control unit 26 is constructed by using an existing feedback type controller or the like, reads the current heat generation part temperature TT from the heat generation part temperature sensors 17 and 18, and the heat generation part temperature TT is the upper limit value TU. And the lower limit value TL (allowable temperature range)
Adjust the heating control CH to the heaters 1 and 22,
Is to control. Specifically, the heat generation temperature TT
When the temperature falls below the lower limit value TL, the heaters 21 and 22 are operated to heat the heat generating portion and the heat generating portion temperature T
When T falls below the upper limit value TU, the heaters 21 and 22 are stopped so that the heat generating portion is cooled by natural heat dissipation, and the temperature of the heat generating portion is made constant by controlling the amount of heat of these.

The allowable temperature range storage section 24, the allowable temperature range selection section 25, and the heat supply control section 26 are two systems corresponding to the journal section 2A and the upper end section of the connecting rod 3, respectively. The partial temperature sensor 17 detects the temperature of the journal portion 2A, and the heater 22 is operated based on the allowable temperature range for the journal portion 2A.
The temperature of the upper end of the connecting rod 3 is detected, and the heater 21 is operated based on the allowable temperature range for the upper end of the connecting rod 3.

Next, the operation of this embodiment will be described with reference to FIG. When starting the operation of the press machine 1, a predetermined operation condition is selected according to the press work to be executed. At this time, the selected operating condition DM is input to the controller 23 from the console 20.

While the press machine 1 is in operation, the journal portion 2A and the upper end of the connecting rod 3, which are heat generating portions, generate sliding heat by themselves and are subjected to temperature adjustment by oil from the lubricating oil unit 8, It is almost constant at a predetermined temperature. Therefore, the heat generation portion temperature TT detected by the heat generation portion temperature sensors 17 and 18 is also substantially constant (section on the left side of the time M1 in FIG. 4).

Here, when the press machine 1 is temporarily stopped (time M1 in FIG. 4), the sliding heat generation of the heat generating portion disappears, and the heat generating portion temperature TT decreases. If this state is left unattended, the heat generation part temperature TT continues to decrease as shown by the broken line in FIG. 4 and the die height of the press machine 1 fluctuates greatly, but in this embodiment, as shown by the solid line, the upper limit is reached. It is maintained within an allowable temperature range between the value TU and the lower limit value TL, and the die height of the press machine 1 is maintained within a certain allowable range.

That is, the allowable temperature range selector 25 constantly monitors the external temperature TC from the external temperature sensor 19, and whenever there is a change in the external temperature TC, the external temperature TC and the console 20.
The upper limit value TU and the lower limit value TL corresponding to the operating condition DM input from are selected, and these values are set to the heat supply control unit 26.
Set to.

The heat supply means 26 is the heat generation part temperature sensor 1
The heat generating portion temperature TT from 7 and 18 is monitored, and the heaters 21 and 22 are activated at a time point M11 when the heat generating portion temperature TT falls below the lower limit value TL to heat the heat generating portion. As a result, the heat generation part temperature TT starts to rise. The heating is continued, but at the time point M1 when the heat-generating portion temperature TT exceeds the upper limit value TU.
At 2, the heaters 21 and 22 are stopped by the heat supply control unit 26, and the heat generation portion temperature TT starts to drop again.

By repeating such heating, the heat generation part temperature TT is maintained within a constant range from the operation stop (time M1) to the operation restart (time M2). In addition, for example, when the operation is restarted while the heating is started from the time M13, the heating may be stopped at that time, or may be stopped after the upper limit value TU is reached.

When the operation of the press machine 1 is restarted after such an operation stop, the heat generating portion is maintained within the above-mentioned predetermined temperature range, and the die height should be immediately operated in a normal and appropriate state. You can On the other hand, when the temperature of the heat-generating portion is left as it is, the temperature gradually rises from the time of restarting the operation and the temperature of the heat-generating portion returns to the normal state until the time M3 is delayed, as indicated by the broken line in FIG. This period (M2
Up to M3), a proper die height cannot be obtained.

In this embodiment, the temperature control is effective not only during the temporary stop but also during the normal operation. That is, when the temperature of the heat generating portion is lowered for some reason during normal operation of the press machine 1, heating is also started when the heat generating portion temperature TT falls below the lower limit value TL, and up to the time M15 when the upper limit value TU is reached. Continued. This allows
Even during operation, the heat generating portion is maintained within the predetermined temperature range.

According to the present embodiment as described above, when the press machine 1 is stopped for a relatively short time during operation,
Even if the temperature of the upper end portion of the connecting rod 3 and the journal portion 2A of the crankshaft 2 which are the heat generating portions is lowered, the heater 2
By heating from Nos. 1 and 22, these temperatures can be maintained within a predetermined allowable temperature range, and the die height during this operation stop period can be maintained within the predetermined allowable range.

Therefore, since the die height is a proper value even when the operation is restarted, high-precision machining can be achieved immediately after the operation is restarted. The allowable temperature range serving as a reference for temperature control of the heat generating portion is stored in advance in the allowable temperature range storage unit 24 in correspondence with the operating conditions and the external temperature, and the allowable temperature range selecting unit 25 sets the current operating conditions and Since the one according to the external temperature is selected, it is possible to secure an appropriate die height according to the current operating conditions and the external temperature.

Further, in the present embodiment, it is possible to cope with the temperature fluctuation of the heat generating portion during normal operation, not limited to the temporary stop period of the operation, and the temperature of the heat generating portion fluctuates due to some cause during the operation. This fluctuation can be suppressed even if it is carried out, and it is possible to avoid a reduction in press working accuracy due to a change in die height due to this fluctuation.

A second embodiment of the invention is shown in FIGS. 5 and 6. The present embodiment is the same as the first embodiment except that the external temperature sensor 19 is omitted and the configuration of the control device 23 is different. For simplification, common parts will be described using common reference numerals. The control device 23, which is a different part, will be described below.

In FIG. 5, the control device 23 comprises an allowable temperature range storage unit 27, an allowable temperature range setting unit 25, and a heat supply control unit 26. The allowable temperature range storage unit 27 is connected to the console 20 and stores a predetermined temperature range (upper limit width ΔTU, lower limit width ΔTL) externally input.

The allowable temperature range setting unit 28 is used for the press machine 1.
Is started when the operation is stopped and the stop temperature TS output from the heat generation part temperature sensors 17 and 18 at that time is read, and the upper limit width ΔTU and the lower limit width ΔTL stored in the allowable temperature width storage unit 27 are read. Upper limit value TU = T
S + ΔTU and the lower limit value TL = TS + ΔTL are calculated and set in the heat supply control unit 26. Heat supply controller 26
Is the same as that of the first embodiment, and the explanation is omitted here.

Next, the operation of this embodiment will be described with reference to FIG. At the start of the operation of the press machine 1, the temperature fluctuation range of the heat generating part (the upper end of the connecting rod 3 and the journal part 2A of the crankshaft 2) where the die height does not exceed the allowable range is examined based on experiments and the like. The upper limit width ΔTU and the lower limit width ΔTL indicating the above are input from the console 20 to the allowable temperature width storage unit 27.

While the press machine 1 is operating, the journal portion 2A and the upper end portion of the connecting rod 3 which are heat generating parts generate heat by sliding, and the temperature from the lubricating oil unit 8 is adjusted by the oil. It is almost constant at a predetermined temperature. Therefore, the heat generation portion temperature TT detected by the heat generation portion temperature sensors 17 and 18 is also substantially constant (section on the left side of the time M1 in FIG. 4).

Here, when the press machine 1 is temporarily stopped (time M1 in FIG. 6), the sliding heat generation of the heat generating portion disappears, and the heat generating portion temperature TT decreases. If this state is left as it is, the heat generation part temperature TT continues to decrease as shown by the broken line in FIG. 6 and the die height of the press machine 1 fluctuates greatly, but in this embodiment, as shown by the solid line, the upper limit is reached. It is maintained within an allowable temperature range between the value TU and the lower limit value TL, and the die height of the press machine 1 is maintained within a certain allowable range.

That is, when the press machine 1 is stopped, the allowable temperature range setting unit 28 is activated, the heat generation part temperature TS at the stop time M1 is checked, and the allowable temperature range storage unit 27 is referred to. TLs are calculated and these are set in the heat supply means 26.

The heat supply means 26 is the heat generation part temperature sensor 1
The heat generating portion temperature TT from 7 and 18 is monitored, and the heaters 21 and 22 are activated at a time point M11 when the heat generating portion temperature TT falls below the lower limit value TL to heat the heat generating portion. As a result, the heat generation part temperature TT starts to rise. The heating is continued, but at the time point M1 when the heat-generating portion temperature TT exceeds the upper limit value TU.
At 2, the heaters 21 and 22 are stopped by the heat supply control unit 26, and the heat generation portion temperature TT starts to drop again.

By repeating such heating, the heat generation part temperature TT is maintained within a constant range from the operation stop (time M1) to the operation restart (time M2). In addition, for example, when the operation is restarted while the heating is started from the time M13, the heating may be stopped at that time, or may be stopped after the upper limit value TU is reached.

When the operation of the press machine 1 is restarted after such an operation stop, the heat generating portion is maintained within the above-mentioned predetermined temperature range, and the die height should be immediately operated in a normal and proper state. You can On the other hand, when the temperature of the heat-generating portion is left as it is, the temperature gradually rises from the time of restarting the operation and the temperature of the heat-generating portion returns to the normal state until the time M3 is delayed, as indicated by the broken line in FIG. This period (M2
Up to M3), a proper die height cannot be obtained.

According to the present embodiment as described above, similarly to the first embodiment, even when the operation of the press machine 1 is stopped for a relatively short time, the heating from the heaters 21 and 22 is performed. As a result, the temperatures of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2 which are heat generating parts can be maintained within a predetermined allowable temperature range. Then, the die height during this operation stop period can be maintained within a predetermined allowable range, and high-precision machining can be achieved immediately after the operation is restarted.

On the other hand, unlike the first embodiment, the allowable temperature range serving as a reference for the temperature control of the heat generating portion has a predetermined width .DELTA.TU, .DELTA.T in the vertical direction based on the heat generating portion temperature TS at the time of stop.
Since L is set, it is not possible to make detailed settings corresponding to operating conditions and external temperatures, but it is not necessary to carry out experiments in advance to measure the allowable temperature range corresponding to various operating conditions and external temperatures. It is not necessary to prepare a large amount of memory or the like for storing a large number of allowable temperature ranges, and the structure can be simplified.

FIG. 7 and FIG. 8 show a third embodiment of the present invention. In this embodiment, the heat generation part temperature sensor 17,
18 is omitted, and is the same as the first embodiment except that the configuration of the control device 23 is different. For simplification, common portions will be denoted by common reference numerals, and description thereof will be omitted. The control device 23, which is, will be described.

In FIG. 7, the control device 23 includes a compensation heat amount storage unit 29, a compensation heat amount selection unit 30, and a heat supply control unit 2.
6 is provided. The compensation heat quantity storage unit 29 is a data table similar to the allowable temperature range storage unit 24 of the first embodiment, and is similar in that the operating state DM and the external temperature TC are used as search keys, but the stored data is Compensation heat S
The difference is S.

The compensation heat quantity SS is a heat quantity that can be maintained at the same temperature level as that during operation by supplying the heat generation portion (the journal portion 2A and the upper end portion of the connecting rod 3) while the press machine 1 is stopped, It is set by conducting experiments or simulations in advance. Specifically, it is set by calculating the sliding heat generation of the heat generating part, or by conducting a confirmation experiment etc. whether the temperature of the heat generating part is maintained at a predetermined value while adding a predetermined amount of heat to the heat generating part. To be done.

The compensation heat amount selection unit 30 is a condition retrieval means similar to the allowable temperature range selection unit 25 of the first embodiment,
Based on the current operating condition DM input from the console 20 and the current external temperature TC from the external temperature sensor 19, the corresponding compensation heat amount SS is selected from the compensation heat amount storage unit 29, and the heat supply control unit 26 is selected. It is something to set. The heat supply control unit 26 is the same as that in the first embodiment, and the description is omitted here.

Next, the operation of this embodiment will be described with reference to FIG. When starting the operation of the press machine 1, a predetermined operation condition is selected according to the press work to be executed. At this time, the selected operating condition DM is input to the controller 23 from the console 20. The control device 23 determines that the operating condition D
With the input of M, the compensation heat amount selection unit 30 is activated, the external temperature TC from the external temperature sensor 19 is checked, and the compensation heat amount SS corresponding to these external temperature TC and operating conditions DM
Is selected and this value is set in the heat supply control unit 26.

While the press machine 1 is in operation, the journal portion 2A and the upper end portion of the connecting rod 3, which are heat generating portions, generate a certain amount of sliding heat generation SM, and the oil from the lubricating oil unit 8 is used. The temperature is adjusted and is substantially constant at a predetermined temperature TT (section on the left of time M1 in FIG. 8).

Here, when the press machine 1 is temporarily stopped (time M1 in FIG. 8), the sliding heat generation SM of the heat generation portion is generated.
Disappears. If this state is left as it is, the temperature of the heat generating portion continues to decrease as shown by the broken line in FIG. 8 and the die height of the press machine 1 largely fluctuates, but in this embodiment, instead of the sliding heat generation SM. The compensation heat amount SS is supplied, whereby the temperature of the heat generating portion is maintained substantially constant, and the die height of the press machine 1 is maintained within a certain allowable range.

That is, the compensation heat amount selector 30 constantly monitors the external temperature TC from the external temperature sensor 19, and whenever there is a change, the compensation heat amount corresponding to the operating temperature DM input from the external temperature TC and the console 20. SS is selected and this value is set in the heat supply control unit 26.

The heat supply means 26 activates the heaters 21 and 22 at the time point M1 when the operation of the press machine 1 is stopped, and controls the heat generation amount of the heaters 21 and 22 to match the compensation heat amount SS while heating the heat generation portion. The heating by the heaters 21 and 22 is stopped at the time M2 when the operation of the press machine 1 is restarted. As a result, in the heat generating portion, the compensation heat amount SS equivalent to the sliding heat generation SM during operation is supplied during the stop period, and the temperature thereof is maintained substantially constant.

When the operation of the press machine 1 is restarted after such an operation stop, the heat generating portion is maintained at the same temperature as before the operation stop, and the die height should be immediately operated in a normal and proper state. You can On the other hand, if the compensation heat amount SS is not supplied to the heat generating portion during the stop, the temperature gradually rises from the restart of the operation and the temperature of the heat generating portion returns to the normal state, as indicated by the broken line in FIG. It is delayed until the time is returned to M3, and an appropriate die height cannot be obtained during this period (M2 to M3).

According to the present embodiment as described above, similarly to the first embodiment, even when the press machine 1 is stopped for a relatively short time during operation, the compensation from the heaters 21 and 22 is performed. By supplying the heat quantity SS, the temperatures of the upper end portion of the connecting rod 3 and the journal portion 2A of the crankshaft 2 which are heat generating portions can be maintained substantially constant. Then, the die height during this operation stop period can be maintained within a predetermined allowable range, and high-precision machining can be achieved immediately after the operation is restarted.

On the other hand, unlike the method of using the allowable temperature range as in the first embodiment, the temperature control of the heat generating portion sets the compensation heat amount SS required for the heat generating portion at the time of stop in advance, and this compensation is performed. Since the heat quantity SS is used to compensate for the shortage of the sliding heat generation SM, which causes a temperature drop at the time of operation stop,
Although the experiment to set the compensation heat quantity SS in advance is complicated, it is possible to perform a more essential stop response, and there is no fluctuation due to intermittent heating within the allowable temperature range, and more stable die height maintenance is aimed at. You can

The present invention is not limited to the above-mentioned embodiments, and modifications and the like within the scope in which the object of the present invention can be achieved are included in the present invention. That is, in each of the above-described embodiments, the temperature control or the heat amount control of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2 is performed as the heat generating portion, but other sliding portions that affect the die height in the press machine 1, For example, the lower end portion of the connecting rod 3, the slide 4 itself that slides through other bearings and plungers, guides, and the like, the column 15 and the like, and the connecting rod 3 itself that does not generate heat but that transmits heat at each end. It may be made to correspond to a tie rod of a frame or the like, and the location and the number thereof may be appropriately selected for implementation.

The heat generating part temperature sensors 17, 18 and the external temperature sensor 19 are heaters 21, 2 which are heat supplying means.
For 2 and the like, equipment or the like that can satisfy the respective functions may be used as appropriate, and the control device 23 also has respective parts 24 to 30.
If the function of is satisfied, the existing computer technology and control technology may be used for the specific configuration.

Further, in the first embodiment, cooling may be positively performed against overheating during the operation of the heat generating portion, and therefore the heaters 21 and 22 may be replaced by cooling. Heat medium type heat exchanger is used, or heater 2
You may make it provide the heat exchanger which let the refrigerant pass in the vicinity of 1 and 22.

[0066]

According to the present invention, by performing temperature control based on a predetermined allowable temperature range of a heat generating portion or compensating for the amount of heat in accordance with sliding heat generation, an operating state including a temporary stop of the press machine can be achieved. The die height can be maintained at a predetermined value even when there is a change in, and high-accuracy machining can be achieved immediately after restarting the operation.

[Brief description of drawings]

FIG. 1 is a partial sectional front view of a press machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a control device of the first embodiment.

FIG. 3 is a schematic diagram showing a data structure of an allowable temperature range storage unit of the first embodiment.

FIG. 4 is a graph showing control according to the first embodiment.

FIG. 5 is a block diagram showing a control device according to a second embodiment of the present invention.

FIG. 6 is a graph showing the control of the second embodiment.

FIG. 7 is a block diagram showing a control device of a third embodiment of the present invention.

FIG. 8 is a graph showing the control of the third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press machine 4 Slides 5, 7 Upper and lower molds 17, 18 Heat generation part temperature sensor 19 External temperature sensor which is external temperature input means 20 Console 21 which is operating condition input means 21, 22 Heater which is heat supply means 23 Control device 24 Allowable Temperature Range Storage Section 25 Allowable Temperature Range Selection Section 26 Heat Supply Control Section 27 Allowable Temperature Range Storage Section 28 Allowable Temperature Range Setting Section 29 Compensation Heat Quantity Storage Section 30 Compensation Heat Quantity Selection Section CH Heating Control DM Operating Condition SM Sliding Heat Generation SS Compensation heat amount TC External temperature TU, TL Upper and lower limit values of allowable temperature range TT Current heat-generating part temperature TS Heat-generating part temperature at the time of stop ΔTU, ΔTL Upper and lower limit widths that determine the allowable temperature range

Claims (3)

[Claims] 1. A die height holding method for a press machine for holding a die height of a press machine within a predetermined allowable range, comprising: a heat generating portion temperature sensor for detecting a temperature of a predetermined heat generating portion of the press machine; Heat supply means for heating and / or cooling a heat generating portion, an external temperature input section for inputting the temperature outside the press machine, an operating condition input section for inputting operating conditions of the press machine, and the press in advance An allowable temperature range storage unit that stores a plurality of allowable temperature ranges for each combination of machine operating conditions and external temperature is provided, and the current external temperature input to the external temperature input unit from the allowable temperature range storage unit is provided. The current heat generation part detected by the heat generation part temperature sensor is selected by selecting the current allowable temperature range corresponding to the current operating conditions input to the temperature and the operation condition input part. The die height of the press machine, wherein the heat supply means is operated when the minute temperature is out of the current allowable temperature range, and the heat amount is controlled so that the heat generating part temperature falls within the current allowable temperature range. Retention method. 2. A die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range between the temporary stoppage of operation of the press machine and the resumption of operation thereof. A heat generating portion temperature sensor for detecting the temperature of a predetermined heat generating portion and a heat supply means for heating the heat generating portion are provided, and when the operation is stopped, the temperature of the heat generating portion is detected by the heat generating portion temperature sensor. , A permissible temperature range of a predetermined width is set on the basis of this temperature, and the temperature of the exothermic part is detected by the exothermic part temperature sensor during the period from the operation stop to the restart of the operation, and this temperature is out of the permissible temperature range. When the heat supply means is activated,
A die height holding method for a press machine, characterized in that heating is performed so that the heat generating portion temperature falls within the present allowable temperature range. 3. A die height holding method for a press machine for holding the die height of the press machine within a predetermined allowable range between the temporary stoppage of operation of the press machine and the resumption of operation thereof. Of the press machine, an external temperature input section for inputting the temperature outside the press machine, an operating condition input section for inputting operating conditions of the press machine, and the press machine in advance. And a compensation heat amount storage section in which a plurality of compensation heat amounts to be supplied to the heat generating portion during each stop of the press machine are stored for each combination of the operating conditions of the press machine and the external temperature. , The compensation heat quantity storage unit is referred to, and the compensation heat quantity corresponding to the current external temperature input to the external temperature input unit and the current operating condition input to the operating condition input unit is displayed. -Option, and die height holding method of a press machine, characterized in that to perform the heating corresponding to the compensation amount of heat to the heating portion from the heat supply means.