JP2844422B2 - Die height holding method of press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a press machine, the die height, which is the distance between the lower surface of the slide and the upper surface of the bolster when the slide reaches the bottom dead center, is used for producing high precision products such as laminated cores and lead frames. Since it greatly affects the processing accuracy, it is accurately adjusted to a predetermined value at which a good processing state is obtained.

However, in a sliding portion such as a connecting portion between a crankshaft for driving a slide and a connecting rod, operational heat generation accompanying operation is inevitable. When such operational heat is generated, the temperature of the sliding portion or the surroundings gradually increases due to the accumulation thereof, 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 maintaining a constant die height 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 winter or the like, the heated oil is applied to the connecting rod, thereby stabilizing the temperature of the connecting rod. To do.

[0005]

Incidentally, in the operation of the press machine, the operation is temporarily stopped for material replacement, product removal, and the like. During the temporary stoppage of operation, the above-described operating heat generation in the sliding portion also stops. However, since the natural heat radiation according to the difference from the outside air temperature is not stopped, the temperature of the sliding portion and the surroundings gradually decreases with the lapse of time during the stop.

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

An object of the present invention is to provide a method for holding a die height of a press machine, which can maintain a die height at a predetermined value even when there is a change in an operation state including a temporary stoppage of the operation of the press machine.

[0008]

SUMMARY OF THE INVENTION The present invention is a method for holding a die height of a press machine for maintaining a die height of the press machine within a predetermined allowable range, and detects a temperature of a predetermined heat generating portion of the press machine. Temperature sensor, heat supply means for heating and / or cooling the heat generating portion, an external temperature input section for inputting an external temperature of the press machine, and an operation for inputting operating conditions of the press machine A condition input unit and an allowable temperature range storage unit in which a plurality of allowable temperature ranges are stored in advance for each combination of the operating conditions of the press machine and the external temperature are provided, and by referring to the allowable temperature range storage unit, The current allowable temperature range corresponding to the current external temperature input to the temperature input unit and the current operating condition input to the operating condition input unit is selected. Operating the heat supply means when the current heat-generating part temperature detected by the sensor is out of the current allowable temperature range, and controlling the amount of heat so that the heat-generating part temperature falls within the current allowable temperature range. Features.

Further, the present invention is a method for holding a die height of a press machine for maintaining a die height of the press machine within a predetermined allowable range from a temporary stop of the operation of the press machine to a restart of the operation. A heat-generating part temperature sensor for detecting a temperature of a predetermined heat-generating part of the press machine; and a heat supply means for heating the heat-generating part, and when the operation is stopped, the heat-generating part temperature sensor detects the temperature of the heat-generating part. Detect the temperature, set a permissible temperature range of a predetermined width based on this temperature, between the operation stop to 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 unit 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 is a method for holding a die height of a press machine for maintaining the die height of the press machine within a predetermined allowable range from a temporary stoppage of the press machine to a restart of the operation. A heat supply unit for heating a predetermined heat generating portion of the press machine, an external temperature input unit to which an external temperature of the press machine is input, and an operation condition input unit to which an operation condition of the press machine is input, A compensation heat amount storage unit in which a plurality of compensation heat amounts to be supplied to the heat-generating portion while the press machine is stopped is stored in advance for each combination of the operating conditions and the external temperature of the press machine, and the operation is started after the operation is stopped. Until the restart, referring to the compensation calorie storage unit, the current external temperature input to the external temperature input unit and the current operating condition input to the operating condition input unit, 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 description, the heat-generating portion includes, for example, a connecting portion between the crankshaft and the connecting rod, a sliding portion such as a journal portion of the crankshaft, and a column that generates heat by transmitting heat accompanying operation of the sliding portion. Includes parts that affect die height, such as tie rods. Further, as the heat supply means, those provided with a heating means such as a heater in an oil supply circuit of oil to be applied to or injected into the sliding portion, those in which a heating wire is buried at or near the sliding portion, the sliding portion Or the like for performing radiant heating or electromagnetic induction heating, and the type is arbitrary.

The operating conditions of the press machine include the cycle speed of the press operation and the like, and the operating condition input unit includes an operation console that can be manually operated from the outside, a device for controlling the operation of the press machine, and the like. 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 where the press machine is placed, and the external temperature input unit may be a temperature sensor or the like that detects the external temperature, or a device that inputs a temperature value from an operation console.

Further, as the allowable temperature range storage unit or the compensation heat amount storage unit, a data table system in which data such as the allowable temperature range and the compensation heat amount is matrixed as operating conditions and external temperature as retrieval items, And a function method that is set as a function of the external temperature or a combination thereof. Here, the data such as the allowable temperature range and the compensation heat amount may be calculated in advance for each combination of the operating condition and the external temperature by an experiment or the like and set in each storage unit. Then, reference to each storage unit,
Selection of the 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, the heating portion is heated and cooled based on the current operating state selected from the allowable temperature range storage section and the allowable temperature range suitable for the external temperature. Die height fluctuations due to temperature fluctuations can be eliminated.For example, even if 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 maintained at a predetermined level. Will be held.

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

Further, by controlling the calorific value of the heat-producing portion based on the current operating condition selected from the compensating calorific value storage section and the compensating calorific value in accordance with the external temperature, 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 when the crankshaft 2 rotates, an upper die 5 attached to the slide 4.
And the lower mold 7 attached to the bolster 6 are closely 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. Lubricating oil from the lubricating oil unit 8 is supplied to a journal 2A of the crankshaft 2 supported by a bearing 10 via an oil supply circuit 9. Oil supply circuit 12
Is supplied to the oil spraying member 13 through the above.
The oil spraying member 13 is disposed above a connecting portion between the crankshaft 2 and the connecting rod 3, that is, above an upper end of the connecting rod 3,
The oil from the oil sprinkling member 13 is applied to the upper end of the connecting rod 3. The oil supplied to the journal 2A and the upper end of the connecting rod 3 is returned to the lubricating oil unit 8 via the oil reservoir in the bed 14, respectively.

The lubricating oil unit 8 includes 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, supplies the oil supplied from the oil supply circuit 9 to the journal 2A, and supplies the oil. 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 heat by sliding with the operation.
18 are arranged. The upper end of the connecting rod 3 and the journal 2A of the crankshaft 2, which are these heat generating parts.
Oil supply circuits 9 and 12 as heat supply means for heating the oil
Are provided with electric heaters 21 and 22. Further, an external temperature sensor 19 for detecting an external temperature (air temperature around the press machine 1) is provided near the outside of the press machine 1 as an external temperature input unit.

These heating part temperature sensors 17, 18
The external temperature sensor 19 and the heaters 21 and 22 are connected to the control device 23, respectively. Also, the control device 2
A console 20 for performing operation input and output such as display is connected to 3. The console 20 also serves as operating condition input means, and can input information such as what operating conditions are currently set in the press machine 1.

FIG. 2 shows the control device 23. The control device 23 includes a so-called microcomputer system or the like.
, 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
4 are operating condition keys 241 including operating conditions DM1, DM2... Including items such as cycle speed of the press machine 1, external temperatures TC1, TC2... Are external temperature keys 242, and allowable temperatures corresponding to the keys 241 and 242. Range data 24
3 is stored in a matrix form as a data table, and the corresponding allowable temperature range data 243 can be searched from each key 241 and 242 at any time.

The allowable temperature range data 243 includes an upper limit value TU11 and a lower limit value TL of the temperature allowed for the heat generating portion (the upper end of the journal portion 2A and the connecting rod 3).
The data sets are set in advance through experiments or simulations. For example, the upper limit value TU11 and the lower limit value TL11 are set as a 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 selection unit 25 is configured by using an existing condition search routine or the like. The current operating condition DM of the press machine 1 input from the console 20 and the current operating condition DM detected by the external temperature sensor 19 are used. The allowable temperature range storage unit 24 is searched based on the external temperature TC of the allowable temperature range, and the upper limit value TU and the lower limit value TL of the allowable temperature range suitable for the current press machine 1 are searched.
Is selected and output to the heat supply control unit 26.

The heat supply control unit 26 is constructed by using an existing feedback controller or the like, reads the current heat-generating part temperature TT from the heat-generating part temperature sensors 17 and 18, and sets the heat-generating part temperature TT to the upper limit value TU. And the lower limit value TL (allowable temperature range).
The heating control CH for the heaters 21 and 22 is adjusted.
Is controlled. Specifically, the heating part 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, the heat-generating portion is cooled by natural heat radiation, and the temperature of the heat-generating portion is stabilized by controlling the amount of heat.

The above-mentioned allowable temperature range storage unit 24, allowable temperature range selection unit 25, and heat supply control unit 26 are provided as two systems corresponding to the journal unit 2A and the upper end of the connecting rod 3, respectively. The temperature of the journal portion 2A is detected by the partial temperature sensor 17, and the heater 22 is operated based on the allowable temperature range for the journal portion 2A.
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 the present embodiment will be described with reference to FIG. At the start of the operation of the press machine 1, a predetermined operation condition corresponding to the press working to be performed is selected. At this time, the selected operating conditions DM are input from the console 20 to the control device 23.

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

Here, when the operation of the press machine 1 is temporarily stopped (time M1 in FIG. 4), no sliding heat is generated in the heat-generating portion, and the temperature TT of the heat-generating portion decreases. If this state is left as it is, the heat generating portion 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, the upper limit as shown by the solid line The die temperature of the press machine 1 is maintained within a certain allowable range while maintaining the allowable temperature range between the value TU and the lower limit value TL.

That is, the allowable temperature range selection section 25 constantly monitors the external temperature TC from the external temperature sensor 19, and each time there is a change, the external temperature TC and the console 20 are monitored.
The upper limit value TU and the lower limit value TL that correspond 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 includes a heat-generating part temperature sensor 1
The heat-generating part temperature TT from 7 and 18 is monitored, and when the heat-generating part temperature TT falls below the lower limit value TL, the heaters 21 and 22 are started to heat the heat-generating part. As a result, the heat generating portion temperature TT starts to increase. Heating is continued, but the time M1 at which the heat generating portion temperature TT exceeds the upper limit TU is reached.
In 2, the heaters 21 and 22 are stopped by the heat supply control unit 26, and the heat generation part temperature TT starts to decrease again.

By repeating such heating, the heat generating portion temperature TT is maintained within a certain range from the operation stop (time M1) to the operation restart (time M2). Note that, for example, when the operation is restarted while the heating is being performed from the time M13, the heating may be stopped at that time, or may be stopped after reaching the upper limit value TU.

After the operation is stopped, when the operation of the press machine 1 is resumed, the heat-generating portion is maintained within the above-mentioned predetermined temperature range, and the die height is immediately operated in a normal appropriate state. Can be. On the other hand, when the temperature of the heat-generating part is left unchecked, the temperature gradually rises from the restart of operation and the temperature of the heat-generating part returns to the normal state as shown by the broken line in FIG. This period (M2
~ M3), an appropriate 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, if the temperature of the heat-generating portion decreases for some reason during the normal operation of the press machine 1, the heating is also started when the heat-generating portion temperature TT falls below the lower limit TL, and until the time M15 when the temperature reaches the upper limit TU. To be continued. This allows
During the operation, the heat generating portion is maintained within a predetermined temperature range.

According to the present embodiment as described above, when the operation of the press machine 1 is stopped for a relatively short time,
Even if the temperatures of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2 which are the heat-generating portions decrease, the heater 2
By heating from 1, 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 a predetermined allowable range.

For this reason, even when the operation is resumed, the die height has an appropriate value, and high-precision machining can be achieved immediately after the operation is resumed. In addition, the allowable temperature range serving as a reference for the temperature control of the heat generating portion is stored in advance in the allowable temperature range storage unit 24 corresponding to the operating conditions and the external temperature. 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, the present embodiment can cope with the temperature fluctuation of the heat generating portion during the normal operation, not only during the temporary stop period of the operation, and the temperature of the heat generating portion fluctuates for some reason during the operation. This change can be suppressed even when the pressing is performed, and a decrease in press working accuracy due to a change in die height due to the change can be avoided.

FIGS. 5 and 6 show a second embodiment of the present invention. This 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 the sake of simplicity, common parts are described using common reference numerals. The description will be omitted, and the following description will be directed to the control unit 23 which is a different part.

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

The allowable temperature range setting section 28 includes a press machine 1
Is started when the operation is stopped, the stop temperature TS output from the heat generating portion 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. And the 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 description 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 fluctuation range of the temperature of the heat generating portion (the upper end portion of the connecting rod 3 and the journal portion 2A of the crankshaft 2) in which the die height does not exceed the allowable range is examined based on experiments and the like. Is input from the console 20 to the allowable temperature width storage unit 27.

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

Here, when the operation of the press machine 1 is temporarily stopped (time M1 in FIG. 6), no sliding heat is generated in the heat generating portion, and the heat generating portion temperature TT decreases. If this state is left as it is, the heat generating portion temperature TT continues to decrease as shown by the broken line in FIG. 6 and the die height of the press machine 1 greatly fluctuates. In this embodiment, however, the upper limit as shown by the solid line is reached. The die temperature of the press machine 1 is maintained within a certain allowable range while maintaining the allowable temperature range between the value TU and the lower limit value TL.

That is, when the press machine 1 is stopped, the allowable temperature range setting unit 28 is started, the heat generation part temperature TS at the stop time M1 is checked, and the upper limit value TU and the lower limit value are referred to by referring to the allowable temperature width storage unit 27. TLs are calculated, and these are set in the heat supply means 26.

The heat supply means 26 is provided with a heat generating part temperature sensor 1.
The heat-generating part temperature TT from 7 and 18 is monitored, and when the heat-generating part temperature TT falls below the lower limit value TL, the heaters 21 and 22 are started to heat the heat-generating part. As a result, the heat generating portion temperature TT starts to increase. Heating is continued, but the time M1 at which the heat generating portion temperature TT exceeds the upper limit TU is reached.
In 2, the heaters 21 and 22 are stopped by the heat supply control unit 26, and the heat generation part temperature TT starts to decrease again.

By repeating such heating, the heat generating portion temperature TT is maintained within a certain range from the stop of operation (time M1) to the restart of operation (time M2). Note that, for example, when the operation is restarted while the heating is being performed from the time M13, the heating may be stopped at that time, or may be stopped after reaching the upper limit value TU.

After the operation is stopped, when the operation of the press machine 1 is restarted, the heat-generating portion is maintained within the above-mentioned predetermined temperature range, and the die height is immediately operated in a normal appropriate state. Can be. On the other hand, when the temperature of the heat-generating part is left unchecked, the temperature gradually rises from the restart of operation and the temperature of the heat-generating part returns to the normal state as shown by the broken line in FIG. This period (M2
~ M3), an appropriate 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 by the heaters 21 and 22 is performed. Accordingly, the temperatures of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2, which are the heat generating portions, can be maintained within a predetermined allowable temperature range. Then, the die height during the 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 controlling the temperature of the heat-generating portion is determined by a predetermined width ΔTU, ΔT based on the heat-generating portion temperature TS at the time of stoppage.
Because L is set, it is not possible to make detailed settings corresponding to the operating conditions and the external temperature, but there is no need to perform experiments or the like in advance to measure the allowable temperature range corresponding to various operating conditions and the external temperature, etc. There is no need 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.

FIGS. 7 and 8 show a third embodiment of the present invention. In the present embodiment, the heating portion temperature sensor 17 is used.
18 is omitted and the configuration is the same as that of the first embodiment except that the configuration of the control device 23 is different. For the sake of simplicity, common parts are omitted from description using common reference numerals, and different parts are described below. Will be described.

In FIG. 7, the control unit 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 calorie 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 operation state DM and the external temperature TC are used as search keys. Compensated heat S
S is different.

The compensation heat amount SS is a heat amount that can be maintained at the same temperature level as during operation by supplying the heat generating portion (the upper end of the journal portion 2A and 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 conducting an experiment to confirm whether the temperature of the heat-generating part is maintained at a predetermined value while applying a predetermined amount of heat to the heat-generating part. Is done.

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

Next, the operation of the present embodiment will be described with reference to FIG. At the start of the operation of the press machine 1, a predetermined operation condition corresponding to the press working to be performed is selected. At this time, the selected operating conditions DM are input from the console 20 to the control device 23. The control device 23 determines the operating condition D
In response to the input of M, the compensating calorie selection unit 30 is activated, the external temperature TC from the external temperature sensor 19 is checked, and the compensating calorie SS corresponding to the external temperature TC and the operating condition DM is used.
Is set in the heat supply control unit 26.

During the operation of the press machine 1, the upper end of the journal portion 2 A and the connecting rod 3, which are the heat-generating portions, generate a certain amount of sliding heat SM per se and are generated by the oil from the lubricating oil unit 8. After the temperature adjustment, the temperature is substantially constant at a predetermined temperature TT (section to the left of time M1 in FIG. 8).

Here, when the operation of the press machine 1 is temporarily stopped (time M1 in FIG. 8), the sliding heat SM of the heat generating 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 fluctuates greatly. 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 quantity selection section 30 constantly monitors the external temperature TC from the external temperature sensor 19, and every time there is a change, the compensation heat quantity corresponding to the external temperature TC and the operating condition DM inputted from 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 M1 when the operation of the press machine 1 is stopped, and heats the heat-producing portion while controlling the calorific value to match the compensation calorie SS. At the time M2 when the operation of the press machine 1 is restarted, the heating by the heaters 21 and 22 is stopped. As a result, in the heat generating portion, a compensation heat SS equivalent to the sliding heat SM during operation is supplied during the stop period, and the temperature is maintained substantially constant.

After the operation is stopped, when the operation of the press machine 1 is restarted, the heat generating portion is maintained at the same temperature as before the operation was stopped, and the die height is immediately operated in a normal appropriate state. Can be. On the other hand, when the compensation heat amount SS is not supplied to the heat generating portion during the stop, the temperature gradually increases from the time of 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. The return is delayed until time M3, and during this period (M2 to M3), an appropriate 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 compensation from the heaters 21 and 22 is performed. By supplying the heat SS, the temperatures of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2, which are the heat generating portions, can be maintained substantially constant. Then, the die height during the 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, the temperature control of the heat generating part differs from the method using the allowable temperature range as in the first embodiment in that the compensation heat amount SS required for the heat generating part at the time of stoppage is set in advance, and this compensation is performed. In order to compensate for the shortage of the sliding heat SM that causes the temperature drop at the time of operation stop by the heat amount SS,
Although the experiment for setting the compensation heat amount SS in advance is complicated, it is possible to cope with a more essential shutdown, and to maintain a stable die height without fluctuation due to intermittent heating within the allowable temperature range. Can be.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications within a range that can achieve the object of the present invention are included in the present invention. That is, in each of the above-described embodiments, the temperature control or the calorie control of the upper end of the connecting rod 3 and the journal 2A of the crankshaft 2 was performed as the heat generating portion. For example, the lower end of the connecting rod 3, other bearings and plungers, a slide 4 itself and a column 15 which slide through a guide, etc. Further, the connecting rod 3 itself which does not itself generate heat but transmits heat at each end. Or the tie rods of the frame or the like, and the location and number thereof may be appropriately selected in implementation.

The heat generating portion temperature sensors 17 and 18 and the external temperature sensor 19 are provided with heaters 21 and 2 serving as heat supply means.
For 2 and the like, equipment and the like each of which satisfies each function may be appropriately used, and the control device 23 also includes its respective components 24 to 30.
It is only necessary that the functions described above can be satisfied, and a specific configuration may use existing computer technology and control technology.

In the first embodiment, cooling may be actively performed against overheating or the like during operation of the heat-generating portion. For this reason, cooling can be performed instead of the heaters 21 and 22. Use a heat medium type heat exchanger or heater 2
A heat exchanger through which a refrigerant passes may be provided in the vicinity of 1, 22.

[0066]

According to the present invention, by controlling the temperature based on the predetermined allowable temperature range of the heat generating portion or compensating the amount of heat according to the sliding heat, the operating state including the temporary stop of the press machine is performed. , The die height can be maintained at a predetermined value, and high-precision machining can be achieved immediately after restart of operation.

[Brief description of the drawings]

FIG. 1 is a partially 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 control of the second embodiment.

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press machine 4 Slide 5, 7 Upper die and lower die 17, 18 Heating portion temperature sensor 19 External temperature sensor as external temperature input means 20 Console as operating condition input means 21, 22 Heater as heat supply means 23 Controller 24 Allowable temperature range storage unit 25 Allowable temperature range selection unit 26 Heat supply control unit 27 Allowable temperature width storage unit 28 Allowable temperature range setting unit 29 Compensation heat amount storage unit 30 Compensation heat amount selection unit CH heating control DM Operating condition SM Sliding heat SS Compensated heat amount TC External temperature TU, TL Upper and lower limit values of allowable temperature range TT Current heating portion temperature TS Heating portion temperature at stop time ΔTU, ΔTL Upper and lower limit widths that determine allowable temperature range

Claims (3)

(57) [Claims] 1. A method for holding a die height of a press machine for holding a die height of the 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 the heat generating portion, an external temperature input section for inputting an external temperature of the press machine, an operating condition input section for inputting operating conditions of the press machine, A permissible temperature range storage unit in which a plurality of permissible temperature ranges are stored for each combination of a machine operating condition and an external temperature is provided, and from the permissible temperature range storage unit, a current external temperature input to the external temperature input unit is provided. A temperature and a current allowable temperature range corresponding to the current operation condition input to the operation condition input unit are selected, and the current heat generation unit detected by the heat generation part temperature sensor is selected. The die height of a press machine, wherein the heat supply means is operated when the minute temperature is out of the current allowable temperature range, and the amount of heat is controlled so that the temperature of the heat generating portion falls within the current allowable temperature range. Retention method. 2. A method for holding a die height of a press machine within a predetermined allowable range from a temporary stop of the operation of the press machine to a restart of the operation of the press machine. A heat-generating part temperature sensor for detecting the temperature of the predetermined heat-generating part, and heat supply means for heating the heat-generating part are provided, and when the operation is stopped, the temperature of the heat-generating part is detected by the heat generating part temperature sensor. An allowable temperature range having a predetermined width is set based on the temperature, and the temperature of the heat generating portion is detected by the heat generating portion temperature sensor during the period from the operation stop to the operation restart, and the temperature is out of the allowable temperature range. Activate the heat supply means when
A die height holding method for a press machine, wherein the heating is performed so that the temperature of the heat generating portion falls within the current allowable temperature range. 3. A method for holding a die height of a press machine within a predetermined allowable range from a temporary stop of the operation of the press machine to a restart of the operation of the press machine, the method comprising: 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, an operation condition input section for inputting an operation condition of the press machine, And a compensation heat amount storage unit in which a plurality of compensation heat amounts to be supplied to the heat-generating portion during the stop is stored for each combination of the operating condition and the external temperature of the press machine, and from the operation stop to the operation restart. Referring to the compensation heat amount storage unit, the compensation heat amount corresponding to the current external temperature input to the external temperature input unit and the current operation condition input to the operation condition input unit is calculated. -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.