KR101916919B1 - Hot multipoint mold apparatus having cooling nozzle and pressing punch and multipoint forming method using the same - Google Patents

Abstract

A hot multipoint mold apparatus having a forming module according to the present invention includes a plurality of forming modules (110) independently operated each; and a mold (150) to which the forming modules (110) are coupled. Each of the plurality of forming modules (110) includes a punch main body (120) driven upward and downward, an air jet nozzle (130) installed in the punch main body (120), and a punch head (140) separably coupled onto the punch main body (120). The plurality of forming modules (110) include a pressing forming module present in a state where the punch head (140) is coupled on the punch main body (120) and a cooling forming module present in a state where the punch head (140) is removed on the punch main body (120).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot multi-point molding die apparatus including a cooling nozzle and a pressurizing punch integrally, and a multi-

The present invention relates to a hot multi-point molding die apparatus in which a cooling nozzle and a pressurizing punch are integrally installed, and more particularly, to a hot multi-point molding die apparatus in which a plurality of molding modules disposed on a variable mold, And a variable curved surface mold technology in which a variety of curved shape forming functions and uniform cooling functions are blended.

In recent years, the demand for LNG tanks due to the increase in LNG demand tends to increase as a substitute demand due to the rise in oil prices, and as a result, the MOSS type with high safety is preferred.

The above-mentioned MOSS type preference tendency was a direct cause to move to the MOSS type independent structure type tank which is strong against sloshing and excellent in stability due to occurrence of gas leakage due to sloshing in the membrane type.

The MOSS type independent structure type LNG tank uses Al5083 which can maintain the strength characteristic at the cryogenic temperature of 167 degrees LNG, and considering that the LNG tank requires the production of a mold according to each shape in an elliptic shape, A mold system is required to form an Al plate having a curved surface.

Since the product shape is determined along the vertical position of the punches forming the mold in the process of designing the conventional variable mold, the design of the position of the erroneous punches is affected by the pressure mark, non-contact, There is a problem that the dimensional accuracy of the product is lowered due to a problem such as an error (Miss contact).

Conventional documents containing variable mold or non-mold manufacturing techniques for forming a three-dimensional curved plate with respect to a supplied plate include Korean Patent No. 10-1034592 (2011.05.12) and Korean Patent No. 10 -1042056 (June 16, 2011).

(Patent Document 1) KR10-1034592 B

(Patent Document 2) KR10-1042056 B

It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a mold for molding a product through a structure in which a plurality of molding modules made by integrating a cooling nozzle and a pressurizing punch, In which only a minimum number of molding modules required for the molding process are arranged for pressurization and the molding module for the remaining part is used as a cooling module.

It is another object of the present invention to provide a variable mold in which various curved shape forming functions and uniform cooling functions are integrated through vertical position control of a plurality of forming modules disposed on a variable mold.

According to another aspect of the present invention, there is provided a hot spindle molding die apparatus having a molding module, the hot spindle molding die apparatus comprising: a plurality of molding modules (110) independently driven; And a mold 150 to which the plurality of molding modules 110 are coupled, wherein each of the plurality of molding modules 110 includes a punch body 120 driven up and down, And a punch head 140 detachably coupled to the punch body 120. The plurality of forming modules 110 are mounted on the punch body 120 so as to face the punch body 120, And a cooling molding module in which the punch head 140 is removed from the punch body 120. The punch body 140 is provided with a plurality of punches 140,

The punch head 140 includes a head body 142 having a hemispherical shape and a head protrusion 144 coupled to a lower end of the head body 142. The punch head 140 includes a head protrusion 144 And a discharge port of the air jet nozzle 130 is opened and closed.

The mold 150 includes an upper mold and a lower mold spaced apart from the lower portion of the upper mold. The plurality of molding modules 110 are symmetrically disposed on the upper and lower molds.

The arrangement of the pressure forming module is either a radial type, a grid (grid) type or a check pattern type.

According to another aspect of the present invention, there is provided a multi-point molding method comprising: supplying an aluminum plate between upper and lower molds in which a plurality of independently driven molding modules are disposed; Forming a curved surface on the aluminum plate by adjusting a vertical height of the plurality of punch heads (140) by operating a pressure forming module disposed on upper and lower portions of the aluminum plate; And uniformly supplying the cooling air onto the upper and lower surfaces of the aluminum plate being hot formed through the air jet nozzle 130 installed in the cooling forming module.

In the hot multi-point molding die apparatus having the molding module according to the present invention as described above, only the minimum molding module required for molding the product is arranged for pressurization, and the molding module for the remaining portion in a state in which the pressurizing punch is removed, A plurality of punch heads constituting a pressure forming module are vertically positioned to control various positions of a curved surface and a plurality of air jet nozzles provided in a cooling molding module to uniformly perform cooling, Thereby allowing the cooling process to be performed continuously.

1 is a view showing the overall structure of a hot sprinkle molding die apparatus having a molding module having a structure in which a cooling nozzle and a pressurizing punch are integrated according to an embodiment of the present invention.
2 is a view showing the overall structure of a hot sprinkle molding die apparatus having a molding module having a structure in which a cooling nozzle and a pressurizing punch are integrated according to another embodiment of the present invention.
3 shows a basic configuration of a molding module constituting a hot spindle molding die apparatus according to the present invention.
FIG. 4 shows a process in which a part of the molding modules constituting the hot spindle molding die apparatus according to the present invention performs a punching function and the other part performs a cooling function.
5 shows a state in which cooling air is supplied to the upper and lower surfaces of an aluminum plate through an air jet nozzle.
6 shows various arrangements of a hot spindle molding die apparatus according to the present invention.
FIG. 7 illustrates a process of determining a deflection distribution between a plurality of molding modules constituting a hot multipoint molding die apparatus.
8 is a graph showing a maximum shape error curve according to a punch arrangement distance and a target curvature.
FIG. 9 shows a method of designing a position where a plurality of molding modules constituting a hot spindle molding die apparatus make contact with an aluminum plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be " connected, " " coupled, " or " connected. &Quot;

Hereinafter, the structure and function of a hot spindle molding die apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG.

The hot spindle molding die apparatus 100 according to the present invention includes a plurality of molding modules 110 driven independently and a mold 150 to which the plurality of molding modules 110 are coupled. The mold 150 includes an upper mold and a lower mold spaced apart from the lower portion of the upper mold.

The plurality of molding modules 110 may be arranged in a state that a plurality of molding modules 110 are adjacent to each other along the horizontal and vertical directions on the inner surface of the upper mold or the lower mold.

Referring to FIG. 1, a plurality of molding modules 110 constituting the hot spindle molding die apparatus 100 are arranged symmetrically on the upper and lower portions. Specifically, it is seen that a plurality of molding modules 110 are arranged in a 7x7 arrangement on upper and lower molds, respectively.

Referring to FIG. 2, each of the plurality of molding modules 110 may have a rectangular parallelepiped shape as a whole.

The plurality of forming modules 110 includes a punch body 120 which is driven to move up and down respectively, an air jet nozzle 130 which is installed in the punch body 120, and a punch body 130 which is detachably coupled to the punch body 120. [ (140).

The punch head 140 includes a head body 142 having a hemispherical shape and a head protrusion 144 coupled to a lower end of the head body 142.

According to the present invention, various curved shapes are formed on the aluminum plate through the control of the vertical position of a plurality of punch bodies (120) arranged on the upper and lower portions of the aluminum plate, with respect to the aluminum plate supplied between the hot multipoint forming die apparatuses .

In addition, through the air jet nozzle 130 integrated in the punch body 120, the molding and cooling processes for the aluminum plate placed on the plurality of molding modules 110 are continuously performed.

That is, the punch head 140 constituting the molding module 110 of the present invention is detachably coupled to the end of the punch body 120, and the plurality of molding modules 110 are connected to the punch body 120 The punch head 140 may be coupled to the punch body 120 or the punch head 140 may be removed from the punch body 120.

A plurality of forming modules 110 are formed in a state in which the punch head 140 is removed from the punch body 120 and the press forming module existing in a state where the punch head 140 is coupled to the punch body 120 Lt; RTI ID = 0.0 > module. ≪ / RTI >

Referring to FIG. 3, a plurality of molding modules 110 constituting the hot spindle molding die apparatus 100 are arranged symmetrically on upper and lower portions. More specifically, the press forming module existing in a state where the punch head 140 is coupled to the punch body 120 is disposed along the edge of the hot spindle molding die apparatus 100 as a whole, and at the same time, the punch head 140 is removed It can be confirmed that the cold-formed module existing in a state of being placed on the inner side of the press-formed module.

In this state, the curved surface forming process for the aluminum plate to be supplied to the hot spindle molding die apparatus 100 is as follows. A plurality of press forming modules disposed at upper and lower portions along the edge of the hot spindle molding die apparatus 100 are independently driven to make the height of the punch head 140 pressing the aluminum plate different. Thus, it is possible to form a curved surface on the supplied aluminum plate. Further, a plurality of cooling forming modules are independently driven to cool the aluminum plate. That is, the cooling air is formed and supplied to the aluminum plate at the same time through the air jet nozzle 130 disposed on the inside of the punch body 120 constituting the cooling molding module.

Referring to FIG. 4, it can be seen that a plurality of molding modules 110 are arranged in a line along the upper and lower portions of an aluminum plate material requiring molding.

The forming module 110 and the punching head 110, to which the punch head 140 is coupled, except that two molding modules 110 are disposed on the edge portions of the aluminum plate, The molding modules 110 from which the mold 140 is removed are alternately arranged.

In this state, when the punch head 140 is directly coupled to the aluminum plate through the forming module 110 and the punch head 140 is removed from the forming module 110 The air for cooling is supplied at a high pressure through the air jet nozzle 130 incorporated in the air jet nozzle 130. This makes it possible to mold various curved surfaces on the supplied aluminum sheet and to achieve uniform cooling.

5, the cooling air is supplied to the upper and lower surfaces of the bent aluminum plate through the forming module 110 coupled with the punch head 140 through the air jet nozzle 130 to perform cooling.

Referring to FIG. 6, various arrangements of a hot spindle molding die apparatus are shown for evaluation of moldability of the variable mold according to the punch arrangement.

The arrangement form is distinguished from the left by a radial type, a grid (lattice) type and a check pattern type. On the other hand, it can also be configured as a type that fills the entire mold.

Consider the dimensional accuracy and cooling efficiency during array design. Dimensional accuracy and cooling efficiency are different according to the arrangement conditions when designing the punches with the punch interval satisfying the maximum shape error.

The present invention provides a variable curved-surface die capable of independently controlling a forming module coupled with a punch head along a vertical direction.

In addition, the upper mold and the lower mold constituting the variable curved mold may be arranged in a vertical type or an intersect type condition.

Referring to FIG. 7, a deflection distribution between a plurality of molding modules constituting a hot spindle molding die apparatus is determined.

The punch arrangement distance is considered in the variable curved mold design for the hot forming process using the hot multi-point molding die apparatus according to the present invention. To predict the deflection distribution between the punches, it is modified to 4 corner condition.

In the present invention, Navier's solution for 4 edge simply supported plates is used as shown in the following equation (1).

....수식 (1)

(1)

Specifically, the 4 Corner simply supported condition is required to predict the deflection distribution between punch heads constituting a plurality of forming modules.

Due to the principle of superposition, the deflection amount w ₀ of the corner simple support is equal to the sum of the simple support deflection amounts w ₁ and w ₂ of the respective X and Y axes. The concrete expressions are as shown in the following formulas (2) to (4).

....수식 (2)

(2)

....수식 (3)

(3)

....수식 (4)

(4)

8 is a graph showing a maximum shape error curve according to the punch arrangement distance and the target curvature.

Referring to FIG. 9, there is shown a method of designing a position where a plurality of molding modules constituting a hot multi-point molding die apparatus make contact with an aluminum back plate.

The point of contact of the punch head contacting the aluminum plate material changes depending on the shape and position of the target curvature. That is, the punch height is designed by predicting the position of the contact point of the punch head according to the shape and position of the target curvature.

When the target curvature is set to R ₀ and set to the radius (R _p ) of the punch head, the radius of curvature of the point offset at the contact point of the punch head is set to R ₀ -R _p .

The concrete expressions are expressed by the following expressions (5) to (7).

....수식 (5)

(5)

....수식 (6)

(6)

....수식 (7)

(7)

The hot multi-point molding method according to the embodiment of the present invention will be described with reference to Figs. 1 to 8 again.

The hot multi-point molding method using the hot multi-point molding die apparatus 100 according to the present invention enables the free-form surface forming of the supplied metal plate using a plurality of independently driven molding modules 110.

The specific hot multi-point forming process for the supplied metal sheet is as follows.

First, an aluminum plate material is supplied between upper and lower molds in which a plurality of molding modules 110 driven independently of each other are disposed.

In this state, the press forming module disposed on the upper and lower portions of the aluminum plate material is operated to adjust the vertical positions of the plurality of punch heads 140, thereby forming a curved surface on the aluminum plate material.

Meanwhile, the cooling air is uniformly supplied to the upper and lower surfaces of the aluminum plate during hot forming through the air jet nozzle 130 installed in the cooling forming module at the same time as the curved surface forming process using the above-described pressure forming module.

As described above, according to the present invention, various curved surfaces are formed through vertical position control of a plurality of punch heads 140 constituting a pressure molding module, and a plurality of air jet nozzles 130 Allowing uniform cooling, thereby allowing continuous molding and cooling processes. That is, the molding module in which the punch head 140 is removed from the pressure forming module is utilized as a cooling module in a state where only the minimum pressure forming module required for product molding of the supplied aluminum plate is disposed.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

A plurality of molding modules (110) driven independently of each other; And
And a mold 150 to which the plurality of molding modules 110 are coupled,
Each of the plurality of molding modules (110)
An air jet nozzle 130 installed in the punch body 120 and a punch head 140 detachably coupled to the punch body 120,
The plurality of molding modules (110)
A press forming module in which the punch head 140 is coupled to the punch body 120 and a cooling forming module in which the punch head 140 is removed from the punch body 120 doing,
Hot multi - point molding die device.
The method according to claim 1,
The punch head (140)
And a head protrusion 144 coupled to a lower end of the head body 142. The punch head 140 is connected to the punch body 120 through the head protrusion 144, And an opening of the air jet nozzle 130 is opened and closed,
Hot multi - point molding die device.
3. The method of claim 2,
The mold 150 includes an upper mold and a lower mold spaced apart from the lower portion of the upper mold. The plurality of molding modules 110 are symmetrically disposed on the upper and lower molds,
Hot multi - point molding die device.
The method according to claim 1,
Wherein the arrangement of the pressure forming module is one of a radial type and a check pattern type,
Hot multi - point molding die device.
A method of forming a hot multi-point molding using the hot multi-point molding die apparatus according to claim 1,
Supplying an aluminum plate between the upper and lower molds in which a plurality of molding modules 110 are independently driven;
Forming a curved surface on the aluminum plate by adjusting a vertical height of the plurality of punch heads (140) by operating a pressure forming module disposed on upper and lower portions of the aluminum plate; And
And uniformly supplying the cooling air onto the upper and lower surfaces of the aluminum sheet material being hot formed through the air jet nozzle 130 installed in the cooling forming module
Hot spots forming method.

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