KR101763569B1 - Device for Multi forming - Google Patents

Abstract

 A composite molding apparatus is disclosed. A composite molding apparatus according to an embodiment of the present invention includes a lower die installed on a bolster; A gas passage formed in an upper portion of the lower die is connected to the lower die to receive a molding gas from an external gas supplier through a gas supply pipe and a lower molding surface is formed on the upper surface, A lower mold having a plurality of heating cartridges therein; A lower mold corresponding to the lower mold is mounted on the upper slider so as to move up and down in correspondence with the lower mold, an upper molding surface is formed on a lower surface corresponding to the lower mold, a upper mold face is formed around the upper molding surface, An upper mold having a plurality of heating cartridges installed therein; And a blank face provided with a top face face and a holder face face for regulating a material at an initial stage of molding, the face face being provided to be movable in a vertical direction through a cushion spring between the lower die and the lower die, And a through hole formed in the through hole from the upper side of the upper mold corresponding to the lower molding surface of the lower mold corresponding to the slider to the upper molding surface having the deepest molding depth from the lower side of the upper mold corresponding to the lower molding surface of the lower mold, And a contact sensor unit which contacts the outer surface of the workpiece from the upper molding surface to the upper molding surface to output a signal to the controller.

Description

[0001] Device for Multi forming [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite molding apparatus, and more particularly, to a composite molding apparatus for producing a molded article having a deep forming depth and a complicated shape through warm molding and blow molding in one mold in one step.

Generally, the warm molding method is a method for molding a magnesium alloy sheet (magnesium alloy sheet) of a lightweight material with a lower density of metal structure than an aluminum alloy sheet. Recently, For the purpose of applying the magnesium alloy sheet to the body, it is developed and applied according to the demand of various press forming method.

That is, the warm molding process is carried out in the mid-range between cold forming and hot forming, and by supplying heat from a hot mold heated by a heating source applied inside the mold, the yield strength is increased by lowering the yield strength of the material. It is an ongoing method.

The magnesium alloy sheet to which the warm molding process is applied has a crystal lattice structure of HCP (Hexagonal Closed Packed Structure) metal. Due to such a crystal lattice structure, it is difficult to press form at room temperature. In a high temperature region (Non-basal plane slip system) is activated, the formability is drastically improved.

However, the magnesium alloy is a lightweight structural material having a high specific strength and can be reduced in weight by 30% or more as compared with an aluminum alloy. However, compared with competitive materials such as aluminum alloys, the magnesium alloy has a lower cost than a competitive material such as a material price, corrosion resistance, On the side, it is disadvantageous.

Particularly, in the case of producing a product having a deep forming depth or a complicated shape, the number of steps and the number of parts are increased due to limitations in moldability, the molding unit price is increased, and the productivity is lowered.

On the other hand, aluminum alloys are disadvantageous in terms of weight reduction compared with magnesium alloys. However, aluminum alloys have been produced by a die casting method with products which are much more advantageous in terms of material cost and formability, and which have a deep forming depth or complex shapes.

However, in the die casting method described above, an aluminum alloy is injected into a die, which is a casting mold, to perform casting molding. In order to mass-produce the aluminum alloy, the equipment cost is high and the number of steps is large.

In recent years, a new molding technique has been developed using super plasticity, which is a property of a material such as an aluminum alloy, that exhibits ductility of several hundred percent without causing local shrinkage when the material deforms under a specific temperature condition. Has attracted attention.

The embodiment of the present invention is characterized in that, after molding to a maximum forming depth by plastic deformation by pressing force in a warm state by using super plasticity of an aluminum alloy in one metal mold, blow molding is performed at a super plasticity temperature of the aluminum alloy The contact rod of the contact sensor comes into direct contact with the product of the final shape to detect the completion of the blow molding so as to cut off the supply of the molding gas in the optimal state, thereby minimizing the consumption amount of the molding gas To provide a composite molding apparatus.

In one or more embodiments of the present invention, a lower die mounted on a bolster; A gas passage formed in an upper portion of the lower die is connected to the lower die to receive a molding gas from an external gas supplier through a gas supply pipe and a lower molding surface is formed on the upper surface, A lower mold having a plurality of heating cartridges therein; A lower mold corresponding to the lower mold is mounted on the upper slider so as to move up and down in correspondence with the lower mold, an upper molding surface is formed on a lower surface corresponding to the lower mold, a upper mold face is formed around the upper molding surface, An upper mold having a plurality of heating cartridges installed therein; And a lower die having a holder face surface which is provided so as to be vertically movable through a cushion spring between the lower die and the lower die in a state of being fitted around the lower die, And a through hole formed in the through hole from the upper side of the upper mold corresponding to the lower molding surface of the lower mold corresponding to the slider to the upper molding surface having the deepest molding depth from the lower side of the upper mold corresponding to the lower molding surface of the lower mold, And a contact sensor unit that contacts the outer surface of the workpiece from the upper molding surface to the upper molding surface to output a signal to the controller.

Also, an ultra-plastic material may be used as the material, and an aluminum alloy sheet material may be used as the super plastic material.

In addition, the gas supply pipe may be connected to the gas passage through a space formed in a central portion of the lower die.

In addition, the contact sensor unit may include a hollow heat insulating housing fitted to the upper through-hole; A contact sensor inserted into the heat insulating housing and installed so that the contact rod is exposed to the upper molding surface of the upper mold; And a cap coupled to the through hole at an outer side of the upper mold to draw a wire connected to the contact sensor to the outside.

In addition, the contact sensor and the contact rod may further include a heat insulating material filled in the inner space of the heat insulating housing so as to heat the wire and the wire from a high temperature.

Further, the lower molding surface may be formed as a product shape surface so as to be formed only up to a maximum molding depth of the material.

In addition, the upper shaping surface may be formed as a final product shaping surface to form the final shape of the product.

The embodiment of the present invention relates to a warm forming method for forming an aluminum alloy sheet material of super plasticity in a warm state by inducing plastic deformation by a pressing force by a combination of a top and a bottom mold to a maximum forming depth, super plasticity The blow molding process for molding the final shape of the product using the molding gas of high temperature and high pressure at the temperature can be carried out in one mold.

Further, when forming the final shape of the product through blow molding at the super plasticity temperature of the aluminum alloy, the contact bar of the contact sensor directly contacts the final shape product to detect the completion state of the blow molding, The supply can be cut off in an optimal state, thereby minimizing consumption of the molding gas.

In addition, when manufacturing a deep and complicated molded product, the number of components is minimized by a single product, and there is an advantage in terms of cost through a minimized process.

In addition, a portion having a complicated shape has an advantage of minimizing the defective ratio as compared with the existing die casting method by expanding the portion having a complicated shape at a pressing force by non-connection with the mold through blow molding.

1 is a sectional view of a composite molding apparatus according to an embodiment of the present invention.
FIG. 2 to FIG. 6 are step-by-step operating states of the composite molding apparatus according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. The part is omitted.

1 is a sectional view of a composite molding apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a composite molding apparatus according to an embodiment of the present invention includes: an extruded aluminum alloy sheet having a thickness of up to a maximum forming depth; .

Here, the super plasticity material is a material having a property that the material properties show a ductility of several hundred percent without local shrinkage upon deformation under a specific temperature condition. In the embodiment of the present invention, aluminum A plate made of an alloy is used as a material.

That is, in the composite molding apparatus according to the embodiment of the present invention, after the warm forming is performed to the maximum forming depth by plastic deformation by the pressing force at an annealing temperature lowering the intra-tissue dislocation density of the aluminum alloy sheet material as the superplastic material, The process of blow molding the final shape of the product at the super plasticity temperature of the sintered material proceeds in one mold to produce a deeply shaped and complex molded product.

The composite molding apparatus according to the embodiment of the present invention includes a lower die 1, a lower die 3, an upper die 5, a blank holder 7 and a contact sensor unit 19. [

The lower die 1 is provided on a bolster (not shown), and a space SP is formed in the center.

The lower mold 3 is mounted on a central upper surface of the lower die 1, a gas passage L1 is formed in the upper and lower direction, and a lower molding surface 3a is formed on the upper surface. The lower mold 3 is constructed such that a plurality of heating cartridges 13 are installed inside the lower molding surface 3a so as to heat the lower mold 3 to a predetermined temperature by the power supply control of the power supply 15 .

The gas passage L1 is connected to a gas supply unit 11 for supplying a high-pressure molding gas from the outside through a gas supply pipe L2. At this time, the gas supply pipe L2 is connected to the gas pipe L1 through the space SP of the lower die 1 while being connected to the external gas supply device 11

Here, the lower molding surface 3a is formed as a product shape surface so as to be molded only up to the maximum molding depth of the material. Here, the product shape surface refers to a shape surface for forming a shape of a protrusion or a bent portion included in the final shape of the product up to the maximum molding depth of the deleted product.

The upper die 5 is mounted on the upper slider 9 so as to move upward and downward in correspondence with the lower die 3 at the upper portion of the lower die 3. The upper mold 5 has an upper molding surface 5a formed on a lower surface corresponding to the lower mold 3 and a upper mold surface 5b formed around the upper molding surface 5a.

The upper mold 5 is configured to house a plurality of heating cartridges 13 along the upper molding surface 5a and to heat the upper mold 5 to a predetermined temperature by the power supply control of the power supply 15 .

In addition, the upper shaping surface 5a is formed as a final product shaping surface to form the final shape of the product.

The temperature of the heating cartridge 13 inside the upper mold 5 and the lower mold 3 is controlled by a separate controller C of the power supply 15. The controller C controls the gas supply unit 11 to control the supply amount and the supply pressure of the molding gas supplied into the mold through the gas supply pipe L2 and the gas passage L1.

The blank holder 7 is installed to be movable in the vertical direction through the cushion spring 17 between the lower die 1 and the lower die 3 in a state of being fitted around the lower die 3.

This blank holder 7, together with the upper face face 5b, forms a holder face face 7a for regulating the material at the beginning of molding.

The contact sensor unit 19 is disposed on the upper side of the upper die 5 corresponding to the slider 9 from the lower surface of the upper die 5 corresponding to the lower molding surface 3a of the lower die 3 to the upper side Is formed in the through hole (H) penetrating to the upper molding surface (5a) having the deepest molding depth and is brought into contact with the outer surface of the material that has been molded from the upper molding surface (5a) through the contact rod (23) ).

At this time, the through-holes H are formed from the outer side of the upper mold 5 to the upper molding surface 5a having the deepest molding depth.

That is, the contact sensor unit 19 is installed in the through hole H of the upper die 5 with a hollow heat insulating housing 29 inserted therein. Inside the heat insulating housing 29, a contact sensor 21 And is installed.

At this time, the contact bar 23 of the contact sensor 21 is installed such that its tip is exposed to the upper molding surface 5a having the deepest forming depth in the upper mold 5.

A cap 25 is fastened to the through hole H on the outside of the upper mold 5 so that the cap 25 draws the wire 27 connected to the contact sensor 21 to the outside, (29).

The inner space of the heat insulating housing 29 is filled with a heat insulating material 31. The heat insulating material 31 is disposed on the outer side of the contact sensor 21 and the contact rod 23 and the wire 27 in the heat insulating housing 29 ), And has a function of heating to prevent heat from being transmitted from the mold.

FIG. 2 to FIG. 6 are step-by-step operating states of the composite molding apparatus according to the embodiment of the present invention.

Hereinafter, operations of the complex molding apparatus according to the embodiment of the present invention will be described step by step with reference to FIGS. 2 to 6. FIG.

The composite molding apparatus according to the embodiment of the present invention sequentially operates in five steps.

2, an aluminum alloy sheet material P, which is a super plastic material, is injected onto a lower die 3 and a blank holder 7 raised corresponding to the periphery of the lower die 3 .

3, by driving the slider 9, the upper die 5 is first driven down to hold the edge of the aluminum alloy sheet P together with the blank holder 7. Then, in the second step, So that the aluminum alloy sheet P is heated to the warm forming temperature through the heating cartridge 13 formed in the upper die 5 and the lower die 3.

The edge of the aluminum alloy sheet material P is held between the upper mold 5 and the blank holder 7 by the upper face face 5b and the holder face face 7a, Is set at an annealing temperature or lower which lowers the dislocation density of the aluminum alloy sheet material (P) having firing.

4, when the aluminum alloy sheet P is heated to the warm forming temperature, the upper die 5 is joined to the lower die 3 by the driving of the slider 9, So that the aluminum alloy sheet P is warm-formed to the maximum forming depth.

With this warm molding, the aluminum alloy sheet material P is plastically deformed to the maximum forming depth so that the aluminum alloy sheet material P has a primary molding shape.

5, the aluminum alloy sheet P, which is warm-formed up to the maximum forming depth in a state where the upper die 5 and the lower die 3 are joined together, Pressure molding gas is supplied through the gas passage L1 formed in the lower mold 3 to the super plasticity temperature through the upper mold 13 and the lower mold 13, The aluminum alloy sheet material P is blown along the upper shaping surface 5a to blow-mold the final shape of the complex product.

At this time, the contact sensor unit 19 is brought into contact with the outer surface of the aluminum alloy plate P that has been blow-formed in the final shape and the contact rod 23 is pushed toward the contact sensor 21, 21) outputs a signal to the controller (C).

Then, the controller C judges that the aluminum alloy sheet material P is completed in the shape of the final molded product, and controls the gas supply device 11 and the power supply device 15 to quickly cut off the supply of the molding gas and the power supply .

 6, when the upper mold 5 is driven upward by the driving of the slider 9 and is released from the lower mold 3, the molded aluminum alloy molded article (PP .

As described above, according to the composite molding apparatus according to the embodiment of the present invention, the shape of the upper die 5 and the lower die 3 is maintained in a warm state below the annealing temperature lowering the in-tissue dislocation density of the aluminum alloy sheet material P, The aluminum alloy sheet P is heated to a super plasticity temperature in the same mold to induce plastic deformation at a high temperature and a high pressure in the same mold, It is possible to carry out the blow molding with the final shape of the product, and there is no need to additionally provide a separate mold.

Further, according to the composite molding apparatus according to the embodiment of the present invention, it is possible to reduce the number of parts by a single product in a manufacturing process of a deep and complicated molded product, advantageous in terms of cost through minimized process, It is possible to minimize the defect rate as compared with the existing die casting method by enlarging the die by the pressing force by the non-connection with the mold through the blow molding.

When the contact rod 23 of the contact sensor 21 comes into direct contact with the product of the final shape and the blow molding is completed when the final shape of the product is formed through the blow molding at the super plasticity temperature of the aluminum alloy By detecting the state in real time, the supply of the molding gas and the power supply can be cut off promptly, so that the consumption amount of the molding gas and the power consumption can be minimized.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1: Lower die
3: Lower mold
5: HYPER
7: Blank holder
9: Slider
11: Gas supply
13: Heating cartridge
15: Power supply
17: Cushion spring
19: Contact sensor unit
21; Contact sensor
23: Contact rod
25: Cap
27: Wire
29: Insulated housing
P: Aluminum alloy sheet
PP: Aluminum alloy molded product
SP: space portion
L1: gas supply passage
L2: gas supply pipe
C: Controller
H: Through hole
3a: Lower molding surface
5a: upper shaping surface
5b: Hollow face face
7a: Holder face face

Claims (12)

A bottom die installed on the bolster;
A gas passage formed in an upper portion of the lower mold die and connected to the gas supply pipe so as to receive a molding gas from an external gas supply unit through a gas supply pipe and having a lower molding surface formed on an upper surface thereof, A lower mold having a plurality of heating cartridges therein;
A lower mold corresponding to the lower mold is mounted on the upper slider so as to move up and down in correspondence with the lower mold, an upper molding surface is formed on a lower surface corresponding to the lower mold, a upper mold face is formed around the upper molding surface, An upper mold having a plurality of heating cartridges installed therein; And
And a holder face surface which is provided so as to be movable in a vertical direction through a cushion spring between the lower die and the lower die in a state of being fitted around the lower die, / RTI >
And a through-hole formed at an outer side of the upper mold corresponding to the slider and extending from an upper surface of the upper mold corresponding to a lower molding surface of the lower mold to an upper molding surface having a deepest molding depth, And a contact sensor unit that contacts the outer surface of the molded material to output a signal to the controller. The method according to claim 1,
Wherein the superplastic material is applied to the material. 3. The method of claim 2,
Wherein the aluminum alloy sheet material is applied to the superplastic material. The method according to claim 1,
And the gas supply pipe is connected to the gas passage through a space portion formed in a center portion of the lower die. The method according to claim 1,
The contact sensor unit
A hollow heat insulating housing fitted in the through hole of the upper mold;
A contact sensor inserted into the heat insulating housing and installed so that the contact rod is exposed to the upper molding surface of the upper mold;
A cap connected to the through hole at an outer side of the upper mold to draw a wire connected to the contact sensor to the outside;
. ≪ / RTI > 6. The method of claim 5,
And a heat insulating material filled in the inner space of the heat insulating housing so as to heat the contact sensor, the contact rod and the wire from a high temperature. The method according to claim 1,
Wherein the lower molding surface is formed as a product shape surface so as to be molded only up to a maximum molding depth of the material. The method according to claim 1,
Wherein the upper shaping surface is formed as a final product shaping surface to form a final shape of the product. A lower die installed on the bolster and having a space formed at the center thereof;
A gas passage formed in the upper part of the lower mold die and connected to an external gas supply unit through a gas supply pipe in a space part of the lower die, A lower mold in which a plurality of heating cartridges are installed inside the lower molding surface so as to heat the superplastic material to a warm forming temperature or a superfiring temperature;
An upper molding surface formed of a final product shape surface is formed on a lower surface corresponding to the lower mold so as to form a final shape of the product and is mounted on an upper slider so as to move up and down in correspondence with the lower mold, A top mold in which a plurality of heating cartridges are built in along the upper shaping surface so as to heat the superplastic material to the warm forming temperature or the superfiring temperature;
A holder face surface which is provided so as to be movable in the vertical direction through the cushion spring between the lower die and the lower die in a state of being fitted around the lower die and which forms a holder face surface for regulating the superplastic material at the beginning of the molding, Blank Holder; And
A hollow heat insulating housing fitted in a through hole formed from an outer side of the upper mold corresponding to the slider to an upper molding surface having a deepest molding depth from an upper side of the upper mold corresponding to a lower molding surface of the lower mold, A contact sensor inserted in the heat insulating housing so that the contact rod is exposed to the upper molding surface of the upper mold and a cap connected to the through hole at the outer side of the upper mold to draw the wire connected to the contact sensor to the outside Further comprising a contact sensor unit that contacts the outer surface of the workpiece formed from the contact rod to the upper molding surface to output a signal to the controller. 10. The method of claim 9,
The contact sensor unit
And a heat insulating material is filled in an inner space portion of the heat insulating housing so that the contact sensor, the contact rod, and the wire are heated from a high temperature. 10. The method of claim 9,
Wherein the aluminum alloy sheet material is applied to the superplastic material. 10. The method of claim 9,
Wherein the warm forming temperature is set to be equal to or lower than an annealing temperature lowering the in-tissue dislocation density of the material having super plasticity.

Images