JP3287148B2 - Press processing method and apparatus for aluminum or aluminum alloy plate and constant temperature apparatus used for the processing method - 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 and an apparatus for pressing a material of an aluminum or aluminum alloy plate and a constant temperature apparatus used in the method. The present invention relates to a processing method and an apparatus for performing molding by cooling to a low temperature range of 196 ° C. and performing trimming by returning a material to room temperature, and a constant temperature device for returning the material to room temperature.

[0002]

2. Description of the Related Art When forming a material of an aluminum or aluminum alloy sheet, the above material is cooled to a low temperature range of about -50 ° C. to -196 ° C. with liquid nitrogen, and the forming process is performed. It is known that the property is improved.

[0003] Therefore, it has been developed that the material of the aluminum or aluminum alloy plate is cooled to a low temperature range by liquid nitrogen to carry out the forming process. For example, Japanese Patent Application Laid-Open Nos. 6-47
455 and JP-A-5-253625.

[0004]

By the way, the material of the aluminum or aluminum alloy plate is cooled to a low temperature range of about -50.degree. C. to -196.degree. C. with liquid nitrogen and formed, and then trimming is performed in the next step. When processing, the temperature of the material rises from a low temperature range, and since the temperature is not constant, there is a problem that dimensions due to expansion of the material are not constant, and it is difficult to perform accurate trimming.

Therefore, if the material after the forming process is left until the temperature of the material returns to room temperature, there is a problem that it takes too much time to return to room temperature.

It is also conceivable to perform trimming while holding the material after the forming process in a low temperature range. In this case, however, it is necessary to control the temperature of the material and to use a trim-type cutting blade material. There is a problem that it becomes expensive and that the low-temperature brittleness shortens the life of the trim type.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and a press working method according to the present invention is a method for pressing a material of an aluminum or aluminum alloy plate by using aluminum. Alternatively, a step (a) of cooling the material of the aluminum alloy plate to a low-temperature region by a refrigerant, a step (b) of forming the material by a molding die while holding the material in the cooling region, and And (d) a step of trimming the material after returning to normal temperature with a trim mold.

[0008] Further, after trimming the material, a necessary portion of the material is cooled again to a low temperature region, and thereafter, a process of performing restriking is performed.

A press working apparatus according to the present invention comprises: a forming die for forming a material of an aluminum or aluminum alloy plate cooled to a low temperature region; and a forming die for returning the material formed by the forming die to a normal temperature. The apparatus comprises a constant temperature device and a trim mold for trimming a material returned to normal temperature.

[0010] The constant temperature apparatus according to the present invention is a constant temperature apparatus used in a step of returning a material after being cooled to a low temperature region and forming to a normal temperature, and an oil tank in which the material can be immersed freely; Heater for heating oil, and ON / O of the heater
And a thermosensor for detecting the temperature of the oil in order to control the FF.

[0011] Further, a constant temperature apparatus used in a step of returning the material after being cooled to a low temperature range and subjected to molding to a normal temperature,
A fluid ejecting apparatus for ejecting a fluid having a substantially constant temperature to the material is provided.

Further, the apparatus is provided with an infrared sensor for measuring the temperature of the material transferred to the next step.

[0013]

The press working method of the present invention is a method of pressing a raw material of an aluminum or aluminum alloy plate, wherein a step of cooling the raw material of the aluminum or aluminum alloy plate to a low temperature region by a refrigerant, and a step of cooling the raw material (B) a step of performing a forming process using a forming die while holding the material in the region, a step (c) of returning the formed material to room temperature by a constant temperature device, and trimming the material after returning to the room temperature by a trim mold. (D) process, the material after the forming process can be quickly returned to room temperature, and the transition from the forming process to the trimming process can be performed quickly.

Further, after trimming the material, a necessary portion of the material is cooled again to a low temperature region, and then a process of performing a restriking is performed. Therefore, the material is partially cooled again to a low temperature region. As a result, it is possible to perform the forming process on a severe portion of the material with high precision.

The pressing device comprises: a forming die for forming a material of an aluminum or aluminum alloy plate cooled to a low temperature range; a constant temperature device for returning the material formed by the forming die to room temperature; Since it is equipped with a trim type that trims the material returned to normal temperature, it is necessary to quickly transfer the material after performing the forming process in the low temperature range to normal temperature and transfer it to the trim type. Thus, mass production of the forming process of the aluminum or aluminum alloy plate can be achieved.

[0016] Further, a constant temperature device used in a process of returning the material after being cooled to a low temperature range and subjected to the forming process to a normal temperature,
An oil tank capable of freely immersing the material, a heater for heating oil in the oil tank, and a thermosensor for detecting the temperature of the oil to control ON / OFF of the heater are provided. It is easy and quick to immerse the formed material in oil and return it to room temperature, and it is easy to maintain the temperature of the material at substantially constant room temperature.

Further, a constant temperature device used in a step of returning the material after being cooled to a low temperature range and subjected to molding to a normal temperature,
Since it is provided with a fluid ejecting device for injecting a fluid having a substantially constant temperature to the material, it is necessary to return the material to a substantially constant room temperature by injecting a fluid having a substantially constant temperature to the material after forming. It can be done easily and quickly.

Further, since the apparatus is provided with an infrared sensor for measuring the temperature of the material transferred to the next step, the temperature of the material returned from the low temperature range to the normal temperature is detected by detecting the temperature with the infrared sensor. You can check the temperature.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a press apparatus according to the present embodiment cools to a low temperature range of about -50.degree. C. to -196.degree. C. by a method such as immersion in a refrigerant such as liquid nitrogen or liquid helium. A molding die 3 for molding and processing the raw material M1 of the aluminum or aluminum alloy plate, a thermostat 5 for returning the raw material M2 formed by the molding die 3 to normal temperature, and a material M2 returned to normal temperature. And a trim mold 7 for trimming.

The molding die 3 is provided with a lower die 9 and an upper die 11 for forming the material M1 in cooperation with the lower die 9, and prevents wrinkles during the forming of the material M1. The blank holder 13 is provided. Since the configurations of the lower die 9, the upper die 11, and the blank holder 13 are the same as those of a general molding die, a more detailed description of the molding die 3 is omitted.

The thermostat 5 is for returning the raw material M2 formed by the molding die 3 to a normal temperature such as room temperature. In the present embodiment, the raw material M2 is immersed in the oil tank 15. The oil tank 15 is provided with a heater 19 for heating the oil 17, and the heater 19 is turned on and off.
Is provided with a thermosensor 21 for detecting the temperature of the oil 17 in order to control the temperature.

Further, the material M which is taken out of the oil 17 and transferred to the trim mold 7 in the next step is supplied to the thermostat 5.
2 is provided with an infrared sensor 23 for detecting the temperature.

The trim mold 7 is for trimming the material M2 after the temperature of the material M2 is returned to normal temperature by the constant temperature device 5, and includes a lower mold 25, an upper mold 27 and an upper blade 29. The configuration of the trim type 7 is the same as that of a general trim type, and therefore, the details of the trim type 7 will not be described.

In the above configuration, after the material M1 is cooled to a low temperature range by liquid nitrogen, the material M1 is set in the molding die 3, and when the temperature of the material M is in the low temperature region, the molding die is By performing the forming process by using No. 3, the material M1 of the aluminum or aluminum alloy plate can be formed with the formability similar to that of the steel plate.

After the completion of the molding by the molding die 3,
For example, using a suitable transfer device such as an industrial robot or the like, the material M2 after the forming process is transferred from the molding die 3 to the thermostat 5, and the material M2 is immersed in the oil 17 for a predetermined period of time. Return to room temperature.

After the temperature of the material M2 is returned to normal temperature in the constant temperature device 5, the material M2 is transferred from the constant temperature device 5 to the trim mold 7 using an appropriate transport device and set. When taking out the material M2 from the thermostat 5 and transferring it to the trim mold 7, the infrared sensor 23
The temperature of the material M2 is detected by detecting the temperature of the material M2, and when the temperature of the material M2 is within the allowable value, the material M2 is transferred to the trim mold 7 as it is. It can be returned to room temperature.

In the trim type 7, the material M2 is trimmed in the same manner as the normal trim type.

As described above, when the material M2, which has been molded in the molding die 3, is immersed in the oil 17 of the thermostat 5 and returned to normal temperature, the temperature of the oil 17 is always kept substantially constant. The material M2 is returned to a substantially constant room temperature.

That is, the temperature of the oil 17 in the oil tank 15 is detected by the thermo sensor 21. When the temperature of the oil 17 becomes lower than the lower limit, the heater 19 is turned on and the oil 1
Heat 7 When the temperature of the oil 17 reaches an allowable upper limit, the oil 17 is turned off and the heating of the oil 17 is stopped. That is, the temperature of the oil 17 is always kept within a predetermined allowable range.

As already understood, in the present embodiment, when the material M2, which has been cooled to a low temperature region and subjected to molding, is transferred to the trim mold 7 and trimmed, Since the material M2 is returned to the trim mold 7 after returning the M2 to a substantially constant temperature at ordinary temperature, even if the material M2 expands due to a rise in temperature after molding, trimming is performed at ordinary temperature. It is possible to perform trimming processing with high accuracy by using, and it is easy to control the temperature of the material M2.

The configuration of the oil tank 15 is a shape along a path for transferring the material M2 from the molding die 3 to the trim mold 7 by the transfer device, and the material M2 is transferred to the trim mold 7 by the transfer device. It is also possible to adopt a configuration in which the raw material M2 is immersed in the oil 17, that is, a configuration in which the temperature of the raw material M2 is returned to normal temperature while the raw material M2 is being transferred.

FIG. 2 shows a second embodiment of the present invention.
Although the first embodiment is illustrated by changing the type of the molding die 3A, the molding die 3A has a general configuration.
Detailed description is omitted.

The second embodiment differs from the first embodiment in the structure of the thermostat 5A. That is, in the second embodiment, a fluid at a constant temperature such as hot air or hot water or oil is injected from a plurality of nozzles 35 provided in the fluid injection device 33 onto the material M2 mounted on the mounting table 31. Alternatively, the material M2 in the low temperature range is returned to room temperature by spraying (an example of spraying).

FIG. 2 shows an example in which the nozzle 35 is disposed above the mounting table 31. However, the nozzle 35 may also be provided on the mounting table 31 so as to jet fluid from the lower side to the material M2. It is desirable.

The structure of the thermostat 5A is provided in a transfer path for transferring the material M2 from the molding die 3A to the trim mold 7 by the transfer device, and the transfer of the material M2 by the transfer device. It is desirable that the fluid be injected to M2 to return the temperature of the material M2 to normal temperature.

The second embodiment has the same effect as the first embodiment.

FIG. 3 is an explanatory view showing a case in which the material M3 after the trimming processing by the trim mold 7 is restricated.

Since the restriking process is a secondary forming process performed to obtain a predetermined size and shape of the molded product, before the material M2 of the aluminum or aluminum alloy plate is set in the restoring forming die 37, the forming process is performed. In order to improve the formability of a severe part, it is desirable to partially cool the severe part to a low temperature region.

Therefore, in the present embodiment, the material M3 which has been trimmed by the trim mold 7 is placed on a mounting table 39, and the liquid nitrogen is passed through the nozzle 41 to the sharp part of the material M3. Is sprayed to partially cool the severe part to a low-temperature region, and thereafter, the material M3 is set in the mold 37 for restrike to perform the restrike of the material M3.

Therefore, according to this embodiment, the forming process can be performed by partially improving the formability of the material M3 after the trimming process.

The molding die 37 is provided with a lower die 43, a section null die 45 and a pad 47, and is not much different from a general molding die for restriking. Detailed description is omitted.

[0042]

As will be understood from the above description of the embodiments, the present invention provides a method of pressing a material of an aluminum or aluminum alloy plate by pressing a material of the aluminum or aluminum alloy plate with a refrigerant at a low temperature range. (A) a step of cooling the material to a predetermined temperature, a step (b) of forming the material by a molding die while holding the material in a cooling area, and a step (c) of returning the formed material to a normal temperature by using a thermostat. (D) performing trimming of the material after returning to a room temperature by trimming, so that the temperature of the material after forming can be quickly returned to room temperature. Can be performed quickly and the trimming is performed at room temperature, so that the trimming can be performed with high accuracy using a normal trim mold.

In addition, after trimming the material, a necessary portion of the material is cooled again to a low temperature region, and then a process of performing a restriking is performed. Therefore, the material is partially cooled again to a low temperature region. The restriking is performed by partially improving the formability, and the molding process of the severe part of the material can be performed with high precision.

The pressing device comprises: a forming die for forming a material of an aluminum or aluminum alloy plate cooled to a low temperature range; a constant temperature device for returning the material formed by the forming die to room temperature; Since it is equipped with a trim mold that trims the material that has been returned to room temperature, it is possible to reduce the time required to return the material to room temperature after forming processing in the low temperature range, and from the molding die to the trim mold. The transfer can be performed quickly, the mass production of the forming process of the aluminum or aluminum alloy plate can be achieved, and the trimming process is performed at room temperature, so that the trimming process is easy.

Further, a constant-temperature apparatus used in a step of returning the material after being cooled to a low temperature range and subjected to the forming process to a normal temperature,
An oil tank capable of freely immersing the material, a heater for heating oil in the oil tank, and a thermosensor for detecting the temperature of the oil to control ON / OFF of the heater are provided. It is easy and quick to immerse the molded material in oil and return it to room temperature, and it is easy to maintain the temperature of the material at almost constant room temperature. Easy.

Further, a constant temperature device used in a step of returning the material after being cooled to a low temperature range and subjected to molding to a normal temperature,
Since it is provided with a fluid ejecting device for injecting a fluid having a substantially constant temperature to the material, it is necessary to return the material to a substantially constant room temperature by injecting a fluid having a substantially constant temperature to the material after forming. It can be done easily and quickly.

In this case, the use of warm air as the fluid does not pollute the surrounding environment.

Further, since the apparatus is provided with an infrared sensor for measuring the temperature of the material transferred to the next step, the temperature of the material returned from the low temperature range to the normal temperature is detected by detecting the temperature with the infrared sensor. You can check the temperature.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an overall configuration of an apparatus according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an operation of a restrike process.

[Explanation of symbols]

 Reference Signs List 3 Molding die 5, 5A constant temperature device 7 Trim die 19 Heater 21 Thermo sensor 23 Infrared sensor 33 Fluid ejecting device

Continuation of front page (56) References JP-A-6-154894 (JP, A) JP-A-7-80569 (JP, A) JP-A-6-79360 (JP, A) JP-A-5-7944 (JP) , A) Fully open sho 64-38118 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21D 22/20 B21D 22/30 B21D 24/00 B21D 28/00

Claims (6)

(57) [Claims] 1. A method for pressing an aluminum or aluminum alloy plate comprising the following steps as a method for pressing a material of an aluminum or aluminum alloy plate. (A) a step of cooling the material of the aluminum or aluminum alloy plate to a low temperature region by a refrigerant, (b) a step of holding the material in the cooling region and forming by a forming die, (c)
A step of returning the formed material to normal temperature by a constant temperature device,
(D) a step of trimming the material after returning to room temperature by a trim mold. 2. The aluminum or aluminum alloy according to claim 1, further comprising a step of, after trimming the material, cooling a necessary portion of the material to a low-temperature region again, and then performing a restrike. Press working method of the plate. 3. A molding die for molding a raw material of an aluminum or aluminum alloy plate cooled to a low temperature range, a constant temperature device for returning the raw material formed by the molding die to normal temperature, and a constant temperature device for returning to normal temperature. And a trim die for trimming the cut material. 4. A constant temperature device used in a step of returning a material after being cooled to a low temperature region and subjected to molding to a normal temperature, and an oil tank capable of immersing the material and a heater for heating oil in the oil tank. And a thermosensor for detecting the temperature of the oil to control ON / OFF of the heater. 5. A constant temperature device used in a step of returning a material after being cooled to a low temperature range and subjected to molding to a normal temperature, and comprising a fluid ejecting device for injecting a fluid having a substantially constant temperature to the material. A constant temperature device characterized by the above-mentioned. 6. An infrared sensor for measuring a temperature of a material to be transferred to a next step.
Or the thermostatic apparatus according to 5.