JPH08150422A - Formation of aluminum or aluminum alloy sheet and forming die therefor - Google Patents

Abstract

PURPOSE: To smoothen a forming work by forming while removing water drips in an air vent caused by dew condensation or preventing the freezing thereof by suitable means of air jetting, etc., at the time of forming at a low temp. CONSTITUTION: At the time of forming the blank cooled with cooling medium in a forming die 1, to the air vents 15 arranged in an upper and a lower dies 3, 5, the air is jetted from an air supplying source 25 through the piping 23 and an air pipe 19, or the air supplying source 21 is changed to a sucking device to suck the air in the air vent 15, and then, while removing the water drip in the air vent 15, the formation is executed. In the case of air-jetting, the warm dry air is desirably used, but since the jetting to the blank under a low temp. condition is not desirable, the jetting is executed in the interval after completing the formation, at which the upper die 3 reaches the lower dead center, and just before charging the following new blank into the lower die 5. Further, in the case of air-sucking, it is desirable to avoid the generation of negative pressure at the time of taking out the formed produce from a lower die 5 after completing the formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a cooling medium such as liquid nitrogen or liquid helium at about -50 ° C to -196 ° C.
The present invention relates to a method of forming and processing a material of an aluminum or aluminum alloy plate that has been cooled to a low temperature range of ℃, and a molding die used in the forming and processing method. More specifically, it relates to the contact between the cooled material and the atmosphere. The present invention relates to a molding method having a function of preventing freezing of water droplets, and a molding method of performing a molding process by preventing water drops generated by dew condensation from freezing in an air vent of a molding die and blocking the air vent.

[0002]

2. Description of the Related Art When forming a material for an aluminum or aluminum alloy plate, the material is cooled to a low temperature range of about -50 ° C. to -196 ° C. by a cooling medium and is formed into a steel plate. It is known that the sex improves.

As a prior art example in which a material of aluminum or an aluminum alloy plate is cooled to a low temperature region by a cooling medium to perform a forming process, for example, Japanese Patent Laid-Open No. 4-300032.
No. 6, JP-A-6-47455, JP-A-5-253625
There are issues, etc.

[0004]

By the way, when the material of aluminum or aluminum alloy plate is cooled to a low temperature range and subjected to the forming process, water drops due to dew condensation are generated in the air vent of the molding die, and the water drops are frozen. As a result, the air vent may be clogged.

When the air vent is clogged, air becomes trapped in the mold during the molding process, which may cause defective molding.

[0006]

The present invention has been made in view of the conventional problems as described above, and a forming method of the present invention is to produce a material of an aluminum or aluminum alloy plate cooled by a cooling medium, When performing a molding process using a molding die, air is jetted to the air vents provided in the upper and lower molds of the molding die, or air is sucked from the air vent, and a water droplet in the air vent. It is a method of forming an aluminum or aluminum alloy plate by removing the above.

Further, when the material of the aluminum or aluminum alloy plate cooled by the cooling medium is formed by using the forming die, air vents provided in the upper and lower dies of the forming die are appropriately added. It is a method of forming an aluminum or aluminum alloy plate which is heated to prevent freezing of water droplets in the air vent and to perform forming.

The molding die according to the present invention is a molding die for molding a material of an aluminum or aluminum alloy plate cooled by a cooling medium, and blows air to an air vent provided in the molding die. It is equipped with an air jetting device.

Further, a molding die for forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium is provided, and an air suction portion for sucking air from an air vent provided in the molding die is provided. It will be.

Further, a forming die for forming the material of the aluminum or aluminum alloy plate cooled by the cooling medium is provided, and a heating device for heating the vicinity of the air vent provided in the forming die is provided. It will be.

[0011]

According to the present invention, when the material of the aluminum or aluminum alloy plate cooled by the cooling medium is subjected to the molding process using the molding die, the air vents provided in the upper and lower molds of the molding die are used. Injecting air or sucking air from the air vent to remove the water droplets in the air vent and perform molding processing, so when water droplets due to dew condensation occur in the air vent, However, the water droplets in the air vent are removed by jetting or sucking air. Therefore, water droplets do not freeze in the air vent, and the molding process can be easily performed while preventing clogging of the air vent.

Further, according to the present invention, when the material of the aluminum or aluminum alloy plate cooled by the cooling medium is subjected to the molding process using the molding die, the air vents provided in the upper and lower molds of the molding die. The air vent is heated even if water droplets are generated in the air vent due to dew condensation because the molding process is performed by appropriately heating the water vent inside the air vent to prevent it from freezing. By doing so, it is possible to prevent freezing of water droplets in the air vent, and it is possible to perform molding processing in a state where the air vent is not clogged.

The molding die is a molding die for molding a material of an aluminum or aluminum alloy plate cooled by a cooling medium, and an air ejection device for ejecting air to an air vent provided in the molding die. Therefore, even if water droplets are generated in the air vent due to dew condensation, by ejecting air into the air vent, the water droplets in the air vent can be scattered or dried and evaporated. Can be removed.

Further, a molding die for forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium is provided, and an air suction portion for sucking air from an air vent provided in the molding die is provided. Therefore, even if water droplets are generated in the air vent due to dew condensation, the water droplets can be sucked and removed to prevent the water droplets from freezing in the air vents, and the air vents can be clogged due to the freezing of the water droplets. Can be prevented.

Further, a forming die for forming the material of the aluminum or aluminum alloy plate cooled by the cooling medium is provided, and a heating device for heating the vicinity of the air vent provided in the forming die is provided. Therefore, even if water drops are generated in the air vent due to dew condensation, the vicinity of the air vent can be appropriately heated, and the water drops can be prevented from freezing in the air vent.

[0016]

Embodiment Referring to FIG. 1, a molding die 1 according to this embodiment comprises an upper die 3, a lower die 5 and a blank holder 7. The upper die 3 is attached to the vertically movable inner slide 9 in the press, and the lower die 5 is attached to the bolster 11 in the press. The blank holder 7 is attached to the outer slide 13 which is vertically movable in the press.

The upper mold 3, the lower mold 5 and the blank holder 7
Is similar to the relationship with the upper die, lower die, and blank holder in a general molding die.

Air vents 15 are provided at appropriate positions of the upper mold 3 and the lower mold 5, and brackets 17 are provided at positions corresponding to the respective air vents 15.
Each bracket 17 supports the vicinity of one end of an air pipe 19 whose ejection port is directed toward the corresponding air vent 15.

The air tube 19 is made of, for example, a rubber or resin hose or a metal tube, and the other end of each air tube 19 is located at an appropriate position such as the lower die 5 or the blank holder 7. It is connected to the attached piping unit 21. The piping unit 21 is connected to an air supply source 25 via a piping 23.

The air supply source 25 supplies dry air to each of the air vents 15, and hot air is preferable as the dry air.

In the above structure, the material of the aluminum or aluminum alloy plate is cooled to a low temperature range of about -50 ° C to -196 ° C by a cooling medium such as liquid nitrogen or liquid helium, and the cooled material is cooled down. After being set on the die 5, the blank holder 7 is lowered to press and fix the material to the lower die 5, and the upper die 3 is engaged with the lower die 5 to perform the forming process of the material.

When the material is formed by the upper and lower molds 3 and 5 as described above, the material is in a state of being cooled to a low temperature range, so that the air inside the air vents 15 of the upper and lower molds 3 and 5 is When cooled, water droplets may be generated in the air vent 15 due to dew condensation, and the water droplets may be frozen to cause clogging of the air vent 15.

Therefore, in this embodiment, air is supplied from the air supply source 25 to the air pipe 19, dry air is jetted from the air pipe 19 to the air vent 15, and water droplets generated in the air vent 15 are removed. It is configured to be scattered or evaporated and removed.

As a structure for removing water droplets generated by dew condensation in the air vent 15, if the water droplets are scattered,
The splashed water droplets may be frozen and may adversely affect the molded product, so it is desirable to remove them by evaporating them.

Therefore, it is desirable to supply hot air dry air (including room temperature dry air) from the air supply source 25. However, it is not desirable to blow dry air to the material that has been cooled to a low temperature range, so the upper die 3 reaches the bottom dead center as the time to eject air from the air pipe 19 to the air vent 15. It is desirable that it is after the molding process of the material has been completed and before the next new material is set in the lower mold 5.

Therefore, in the present embodiment, it is detected that the upper die 3 has reached the bottom dead center and the molding process has been completed (this bottom dead center detection is, for example, a rotary switch or a ram position detector provided in the press). Can be carried out easily by means of the above), a switching valve (not shown) is opened to start ejection of air to the air vent 15, and after ejection of the molded product from the molding die 1, the ejection of air is stopped. There is.

As a construction for stopping the ejection of air after the molded product is taken out, the timer is activated when it is detected that the upper die 3 has reached the bottom dead center, and after the set time of this timer has elapsed. This can be easily implemented by adopting a configuration in which the switching valve is closed.

As can be understood from the above description,
In this embodiment, dry air is jetted to the air vents 15 provided in the upper and lower molds 3 and 5 of the molding die 1 to remove water droplets generated in the air vents 15 due to dew condensation. In the air vent 15, water droplets are not frozen to cause clogging, and when molding a material cooled in a low temperature range, molding defects due to clogging of the air vent 15 can be easily prevented. Is.

FIG. 2 shows a second embodiment. That is, in the first embodiment shown in FIG. 1, each air vent 15 is provided with each air pipe 19, but in the second embodiment, the chamber 27 connected to the pipe 23 is provided. The lower die 5 is provided with the champer 27 and the air vent 15 connected to each other.

By providing the chamber 27 and connecting the chamber 27 and the air vent 15 in this manner, the air pipe 19 can be omitted, and the configuration of the pipe can be further simplified. .

FIG. 3 shows a third embodiment. In the third embodiment, the air is not jetted to the air vents 15 of the upper and lower molds 3 and 5, but the air is sucked from the air vents 15 and the air vents 15 are sucked.
This is a structure for removing water droplets inside.

Therefore, in the third embodiment, a suction device 27 is connected to the pipe 23 instead of the air supply source 25. In addition, the air pipe 19 is used as an air suction unit,
As a configuration for connecting to the air vent 15, FIG.
As shown in FIG. 4, the air vent 15 and the end of the air pipe 19 may be slightly separated, and as shown in FIG. 4B, the air vent 15 and the air pipe 19 may be directly connected. It is a good one.

In this third embodiment, the air vent 1
Since the water droplets generated by dew condensation in 5 are sucked and removed, for example, when the water droplets due to dew condensation tend to be stored in the recess of the lower die 5, the water droplets in the recess of the lower die 5 should also be sucked and removed. Is something that can be done.

Although it is possible to always suck the air through the air pipe 19, it is necessary to prevent a negative pressure when the molded product after the molding process is taken out from the lower mold 5.
The suction of air is started after the molded product is taken out from the molding die 1, the next new material is set on the lower mold 5, and the suction of air is stopped when the blank holder 7 press-fixes the material. Is desirable.

In the third embodiment, the water drops generated by the dew condensation in the air vents 15 of the upper and lower molds 3 and 5 can be sucked and removed, and the water drops in the air vent 15 are frozen to cause clogging. It is possible to prevent this.

FIG. 5 shows a fourth embodiment. In the fourth embodiment, a bush 31 as a heating device having a heating wire 29 is attached to the air vents 15 of the upper and lower molds 3 and 5.

That is, in the fourth embodiment, the vicinity of the air vent 15 is heated to prevent water droplets from freezing in the air vent 15. The heat transfer wire 29 may be energized at all times or intermittently. Also in the fourth embodiment, it is possible to prevent the water droplets from freezing in the air vent 15 and prevent the air vent 15 from being clogged due to freezing.

[0038]

As can be understood from the above description of the embodiments, the present invention is applied to the case where the material of the aluminum or aluminum alloy plate cooled by the cooling medium is subjected to the forming process using the forming die. Injecting air to the air vents provided in the upper and lower molds of the molding die or sucking air from the air vents to remove water droplets in the air vents and perform molding processing. Therefore, even if water droplets are formed in the air vent due to dew condensation, the water droplets in the air vent are removed by air injection or suction, and the air vent does not freeze, and the air vent is clogged. The molding process can be carried out while preventing the above-mentioned problems, and the molding defect due to the clogging of the air vent is not caused.

Further, when the material of the aluminum or aluminum alloy plate cooled by the cooling medium is molded by using the molding die, air vents provided in the upper and lower molds of the molding die are appropriately added. Since it is heated and the molding process is performed while preventing freezing of water droplets in the air vent, even if water droplets are generated in the air vent due to dew condensation, it is possible to warm the air vent by heating the air vent. It is possible to prevent water droplets from freezing in the vent, and to easily perform molding processing in a state where the air vent is not clogged.

Further, according to the present invention, an air jet for jetting air to an air vent provided in the molding die is provided which is a molding die for forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium. Since it is equipped with a device, even if water droplets are generated in the air vent due to dew condensation, by ejecting air to the air vent, the water droplets in the air vent can be scattered or dried and evaporated. It can be removed.

Further, according to the present invention, an air suction for sucking air from an air vent provided in the molding die is provided, which is a molding die for forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium. Since it is equipped with a part, even if water droplets are generated in the air vent due to dew condensation, the water droplets can be sucked and removed, and the water droplets can be prevented from freezing in the air vent. It is possible to prevent the clogging of the air vent due to the freezing.

Further, according to the present invention, a forming die for forming an aluminum or aluminum alloy sheet material cooled by a cooling medium is used, and the vicinity of the air vent provided in the forming die is heated. Since it is equipped with a temperature device, even if water droplets are generated in the air vent due to dew condensation, it is possible to appropriately heat the vicinity of the air vent and prevent freezing of water droplets in the air vent. It is possible.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a molding die according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment.

FIG. 3 is an explanatory view of a molding die according to a third embodiment.

FIG. 4 is an explanatory diagram showing a connection state of air pipes to air vents.

FIG. 5 is an explanatory diagram of a fourth embodiment.

[Explanation of symbols]

 1 Molding Mold 3 Upper Mold 5 Lower Mold 15 Air Vent 19 Air Pipe 27 Suction Device 29 Heating Wire

Claims (5)

[Claims] 1. When forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium using a molding die, air is supplied to air vents provided in upper and lower dies of the molding die. A method for forming an aluminum or aluminum alloy plate, characterized in that the forming process is performed by injecting or by sucking air from the air vent to remove water droplets in the air vent. 2. When forming a material of an aluminum or aluminum alloy plate cooled by a cooling medium using a molding die, air vents provided in upper and lower dies of the molding die are appropriately added. A method of forming an aluminum or aluminum alloy sheet, which comprises heating and forming the same while preventing freezing of water droplets in the air vent. 3. A molding die for molding a material of an aluminum or aluminum alloy plate cooled by a cooling medium, comprising an air ejection device for ejecting air to an air vent provided in the molding die. Molding die characterized in that 4. A molding die for molding a material of an aluminum or aluminum alloy plate cooled by a cooling medium, comprising an air suction part for sucking air from an air vent provided in the molding die. Molding die characterized in that 5. A molding die for molding a material of an aluminum or aluminum alloy plate cooled by a cooling medium, comprising: a heating device for heating the vicinity of an air vent provided in the molding die. Molding die characterized in that