JPH0857552A - Method for pressing cooling plate and press die used therefor - Google Patents

Abstract

PURPOSE: To restrict the increase of the temperature of a cooling plate and to form the cooling plate in an effective and low temperature range by supporting the cooling plate in the state of being separated from a lower die and a blank holder, and then, pressing the cooling plate while lowering an upper die. CONSTITUTION: When a cooling plate 5 is set on a lower die 1, it is supported with plural supporting pins in plural supporting means 9 provided on a blank holder 3, and it is held in the state of being separated from the upper faces of the lower die 1 and the blank holder 3. When an upper die 7 is lowered relatively, the circumferential part of the upper die 7 is brought into contact with the cooling plate 5, the supporting pins and the cooling plate 5 are pushed down, and the circumferential part of the cooling plate 5 is clamped and fixed between the upper die 7 and the holder 3. When the upper die 7 is lowered further, the cooling plate 5 is brought into contact with the upper face of the lower die 1, then the lower die 1 and the upper die 7 are engaged with each other and the cooling plate 5 is worked. Therefore, the cooling plate 5 is easily worked keeping it in the range of low temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for press-forming a cooling plate obtained by cooling a work such as an aluminum alloy plate in a low temperature range (-50 ° C. or lower) and a press die used in the method. More specifically, when the cooling plate is set in the lower mold, the cooling plate is spaced apart from the upper surfaces of the lower mold and the plank holder to support the cooling plate, thereby suppressing the temperature rise of the cooling plate and performing press molding. Regarding the type.

[0002]

2. Description of the Related Art Conventionally, for example, an aluminum alloy plate or the like is -50.
When press-molding the cooling plate after cooling to the low temperature region below, as shown in FIG. 4, the cooling plate 5 is directly placed on the upper surface of the blank holder 3 provided around the lower mold 1 so as to be vertically movable. And set.

After that, the upper die 7 is relatively lowered to fix the cooling plate 5 between the upper die 7 and the blank holder 3 by clamping, and then the upper and lower dies 7, 1 are engaged. The cooling plate 5 is molded according to.

[0004]

As described above, when the cooling plate 5 is directly placed on the upper surface of the blank holder 3 and set, the heat conduction from the blank holder to the cooling plate 5 is large and the temperature of the cooling plate 5 rises. The speed increases, and the low temperature range (-5
Despite being cooled to 0 ° C. or less), there is a problem that molding in an effective low temperature range becomes difficult.

[0005]

The present invention has been made in view of the conventional problems as described above, and the method of the present invention is a method for press-forming a cooling plate, in which the cooling plate is a lower mold and a blank. Supports both holders apart from each other (a)
The cooling plate is press-molded, which includes a step and a step (b) of forming the cooling plate by lowering and engaging the upper mold with respect to the lower mold.

Further, the press die is provided with a blank holder movably up and down around a lower die for forming a cooling plate in cooperation with an up and down movable upper die, and the blank holder is provided with the blank holder. And a cooling plate supporting means capable of supporting the cooling plate in a state of being separated from the upper surface of the lower mold.

Further, cooling plate supporting means capable of supporting the cooling plate in a state of being separated from the upper surface of the lower mold in the peripheral portion of the lower mold for forming the cooling plate in cooperation with the vertically movable upper mold. Is provided.

The cooling plate supporting means capable of supporting the cooling plate is vertically movable in vertical holes provided around the blank holder or the lower mold, and its upper end is projectable from the upper surface of the blank holder or the upper surface of the lower mold. And a support pin that is urged upward, and the upper edge of the hole has a rounded surface and has a polished finish.

[0009]

With the above construction, in the method of the present invention, the cooling plate is supported in a state of being separated from both the lower mold and the blank holder, and then the upper mold is relatively lowered to engage with the lower mold. The press forming of the cooling plate is performed.

That is, when the cooling plate is set on the lower mold, the cooling plate is separated from the lower mold and the blank holder, so that heat is not transferred from the lower mold and the blank holder to the cooling plate, and the cooling is performed. The temperature rise of the plate can be suppressed and the cooling plate can be formed in the effective low temperature range.

With the above construction, in the press die according to the present invention, when the cooling plate is placed on the lower die and set, the cooling plate is supported by the cooling plate supporting means provided in the blank holder and the blank holder and the lower die. It is kept separate from each upper surface of the mold. After that, by engaging the upper and lower molds, the cooling plate can be formed.

That is, when the cooling plate is set on the lower mold, the blank holder and the lower mold are supported in a state of being separated from the respective upper surfaces, so that heat conduction from the blank holder and the lower mold to the cooling plate can be prevented, and the cooling plate can be prevented. The cooling plate can be formed in an effective low temperature range by suppressing the temperature rise.

Further, in the press die according to the present invention, when the cooling plate is placed and set on the lower mold, it is supported by the cooling plate supporting means provided around the lower mold and separated from the upper surface of the lower mold. Held in a state.

Therefore, when the cooling plate is set on the lower mold, heat transfer from the lower mold to the cooling plate is prevented, and the cooling plate can be maintained in a low temperature region in a cooled state, and the cooling plate is kept in the low temperature region. All molding processes can be easily performed.

In the press die according to the present invention,
The cooling plate supporting means for supporting the cooling plate is provided with a support pin having an upper end projectable from a vertical hole provided around the blank holder or the lower die and urged upward. Therefore, when the cooling plate is set on the lower mold, the cooling plate is supported by the support pins and kept in a state of being separated from the upper surfaces of the blank holder and the lower mold. Then, when the upper and lower molds are engaged with each other, they are sunk into the hole against the biasing force.

That is, the cooling plate is supported so as not to come into surface contact with the blank holder and the lower die, and heat transfer from the blank holder and the lower die to the cooling plate can be effectively suppressed.

Further, in the press die according to the present invention, since the upper edge portion of the hole for guiding the support pin supporting the cooling plate so as to be vertically movable is formed into a rounded surface and has a polishing finish, the support pin is It does not cause a galling phenomenon when moving up and down.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a press die according to the present embodiment is provided with a blank holder 3 around a lower die 1 so as to be vertically movable like a conventional press die, and An upper mold 7 for forming the cooling plate 5 in cooperation with each other is provided so as to be vertically movable. Since the structure in which the blank holder 3 moves up and down with respect to the lower mold 1 and the structure in which the upper mold 7 moves up and down by a press machine are known structures, a structure for vertically moving the blank holder 3 and the upper mold 7. Will not be described.

In this embodiment, when the cooling plate 5 is set, the cooling plate supporting means 9 for supporting the cooling plate 5 apart from the upper surfaces of the lower mold 1 and the blank holder 3 is provided in the blank holder 3. It is provided at multiple locations.

In the present embodiment, the cooling plate support means 9 is provided with a vertical hole 11 in the blank holder 3 and a support pin 13 is provided in the hole 11 so as to be vertically movable. It is what

The support pin 13 is always urged upward by an elastic member 15 such as a coil spring mounted between the support pin 13 and the bottom of the hole 11. The upper end 13E of the support pin 13 has a cooling plate 5
It is formed in a hemispherical shape in order to reduce the contact area with, and in the normal state, the upper end 13E of the support pin 13 is held in a state of protruding from the upper surface of the blank holder 3 by the action of the elastic member 15.

The upper edge portion 11E of the guide hole portion 11G of the hole 11 for guiding the support pin 13 so as to be vertically movable is chamfered with a relatively large R so as not to cause a galling phenomenon when the support pin 13 is moved vertically. It is formed on the R (rounded) surface that has been formed, and is a polished finish surface that has been ground.

With the above construction, when the cooling plate 5 is set on the lower mold 1, the cooling plate 5 is supported by the plurality of support pins 13 in the plurality of cooling plate supporting means 9 provided in the blank holder 3 and the lower mold 1 is supported. Also, the blank holder 3 is held in a state of being separated from the upper surface (see FIG. 1A). Since the upper end portion 13E of the support pin 13 is formed in a hemispherical shape, the support pin 13 and the cooling plate 5 are in point contact with each other.

Therefore, when the cooling plate 5 is set, the lower mold 1
Also, the blank holder 3 does not come into direct contact with the cooling plate 5, heat transfer to the cooling plate 5 is suppressed, and the cooling plate 5
Is kept at a low temperature (-50 ° C or lower).

When the upper die 7 is relatively lowered while the cooling plate 5 is supported by the support pins 13 of the cooling plate support means 9 as described above, first, the peripheral portion of the upper die 7 is cooled by the cooling plate. 5, the support pin 13 and the cooling plate 5 are pushed down against the urging force of the elastic member 15 in the cooling plate supporting means 9, and the peripheral portion of the cooling plate 5 is clamped between itself and the blank holder 3 ( See FIG. 1B).

After the cooling plate 5 is clamped and fixed by the blank holder 3 and the upper die 7, when the upper die 7 is further lowered, the blank holder 3 is lowered and the cooling plate 5 comes into contact with the upper surface of the lower die 1. (See FIG. 1C), and then the lower die 1 and the upper die 7 are engaged with each other to form the cooling plate 5 (FIG. 1).
(D)).

That is, in this embodiment, when the cooling plate 5 is set, the cooling plate 5 is held in a state of being separated from the lower die 1 and the blank holder 3, so that the temperature of the cooling plate 5 rises by direct contact. Without such a situation, the cooling plate 5 can be kept in a low temperature range (-50 ° C or less).

Then, the upper die 7 is relatively lowered to lower the die 1.
Since the cooling plate 5 is molded by engaging with the upper die 7, the cooling plate 5 can be easily molded while being held in a low temperature range.

FIG. 3 shows a second embodiment.

In the second embodiment, the lower mold 1 is a female mold and the upper mold 7 is a male mold, and a blank holder 3 is provided around the upper mold 7.

Therefore, in this second embodiment,
A plurality of cooling plate supporting means 9 are provided on the peripheral portion of the lower mold 1, and the cooling plate 5 is supported by the cooling plate supporting means 9.

In the structure of the second embodiment, when the cooling plate 5 is set, the cooling plate 5 is supported by the cooling plate supporting means 9 so that the cooling plate 5 directly contacts the upper surface of the lower mold 1. Since it does not exist, the second embodiment also has the same effect as the first embodiment.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, as a structure of the cooling plate supporting means, a cooling fluid such as low temperature liquid nitrogen such as liquid nitrogen is ejected from the upper surface of the peripheral portion of the blank holder or the lower mold so that the cooling plate and the blank holder region are located between the upper surface of the lower mold. It is also possible to form a layer of cooling fluid on the substrate and support the cooling plate with this layer of cooling fluid.
In this case, it is desirable to provide a groove or recess for cooling fluid on the upper surface.

As the work to be cooled and processed,
The present invention is not limited to aluminum alloy plates, and can be effectively used for vibration damping steel plates, for example.

[0035]

As will be understood from the above description of the embodiments, in the method of the present invention, the cooling plate is supported in a state of being separated from both the lower mold and the blank holder, and thereafter the upper mold is relatively moved. Since the cooling plate is press-formed by descending to the lower mold and engaging with the lower mold, when the cooling plate is set on the lower mold, the cooling plate is separated from the lower mold and the blank holder. Heat is not transferred from the blank holder or the like to the cooling plate, the temperature rise of the cooling plate can be suppressed, and the cooling plate can be molded in the effective low temperature range.

In the press die according to the present invention, when the cooling plate is placed on the lower die and set, the cooling plate is supported by the cooling plate supporting means provided in the blank holder, and each of the blank holder and the lower die is supported. The cooling plate is formed by being held in a state of being separated from the upper surface and then engaging the upper and lower molds.

That is, when the cooling plate is set on the lower mold, the blank holder and the lower mold are supported so as to be separated from the respective upper surfaces, so that heat conduction from the blank holder and the lower mold to the cooling plate can be prevented, and the cooling plate can be prevented. The temperature rise of the cooling plate can be suppressed, and the cooling plate can be easily formed in the effective low sound range.

Further, in the press die according to the present invention, when the cooling plate is placed on the lower die and set, it is supported by the cooling plate supporting means provided around the lower die and separated from the upper surface of the lower die. In this state, heat transfer from the lower mold to the cooling plate is prevented when the cooling plate is set on the lower mold.

Therefore, it is easy to keep the cooling plate in a low temperature region in a cooled state, and it is possible to easily perform the molding process while keeping the cooling plate in the low temperature region.

In the press die according to the present invention,
The cooling plate supporting means for supporting the cooling plate is provided with a support pin having an upper end projectable from a vertical hole provided around the blank holder or the lower die and urged upward. Therefore, when the cooling plate is set on the lower mold, the cooling plate can be supported by the support pins and can be kept in a state of being separated from the upper surfaces of the blank holder and the lower mold.

That is, the cooling plate is supported so as not to come into surface contact with the blank holder and the lower die, and heat transfer from the blank holder and the lower die to the cooling plate can be effectively suppressed.

Further, in the press die according to the present invention, since the upper edge of the hole for guiding the support pin for supporting the cooling plate so as to be vertically movable is formed into a rounded surface and has a polishing finish, the support pin is It does not cause a galling phenomenon when moving up and down.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration and an operation of a main part of a press die according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing details of a cooling plate supporting means.

FIG. 3 is an explanatory diagram showing a main part of a press die according to a second embodiment.

FIG. 4 is an explanatory view showing a main part of a conventional press die.

[Explanation of symbols]

 1 Lower mold 3 Blank holder 5 Cooling plate 7 Upper mold 9 Cooling plate supporting means 13 Support pin

Claims (5)

[Claims] 1. A method for press-molding a cooling plate, comprising:
A method for press-molding a cooling plate, comprising the following steps. (a) A step of supporting the cooling plate in a state of being separated from both the lower mold and the blank holder, (b) Forming the cooling plate by lowering and engaging the upper mold relative to the lower mold. Process. 2. A blank holder is movably provided around a lower mold for forming a cooling plate in cooperation with a vertically movable upper mold, and the blank holder has an upper surface on the blank holder and the lower mold. A press die, comprising cooling plate support means capable of supporting the cooling plate in a state of being separated from the press die. 3. A cooling plate supporting means capable of supporting a cooling plate in a state of being separated from an upper surface of the lower mold in a peripheral portion of a lower mold for forming a cooling plate in cooperation with a vertically movable upper mold. A press die characterized by being provided with. 4. A cooling plate supporting means capable of supporting a cooling plate,
A support pin that is vertically movable in a vertical hole provided around the blank holder or the lower die and has an upper end projectable from the upper surface of the blank holder or the upper surface of the lower die and is biased upward. The press die according to claim 2 or 3, further comprising: 5. The press die according to claim 4, wherein the upper edge portion of the hole has a rounded surface and has a polished finish.