HOT PLATE STRUCTURE OF PRESS MOLDING DEVICE AND CONTINUOUS MOLDING METHOD USING SAME

Abstract

The present invention relates to a hot plate structure of a press molding device, and a continuous molding method using the same. The continuous molding method continuously performs primary and secondary overlapping molding operations on the basis of a length unit which is smaller than a set length unit (cutting width) and accordingly cancels out a boundary part, thereby being capable of improving the thickness difference of the boundary part and thus enabling uniform physical properties to be obtained. The hot plate structure comprises a protrusion part which protrudes by lengthening both sides of a hot plate to the outside of a chamber, wherein the protrusion part is formed at a thinner thickness than the thickness of the hot plate within the chamber so that the pressure and temperature applied to the protrusion part are lower than the pressure and temperature applied through the hot plate within the chamber even if the molding operations are performed with the same time and conditions (pressure, temperature, etc.), whereby due to air cooling and temperature control effects, sheet transformation can be inhibited and bubbling can be controlled during the continuous operations through the aforesaid secondary overlapping molding operation.

Claims

1. A hot plate structure of a press molding device including a chamber and a hot plate, the hot plate structure comprising: a protrusion part which protrudes by lengthening both sides of the hot plate to the outside of the chamber, wherein the protrusion part is formed at a thinner thickness than the thickness of the hot plate within the chamber.

2. The hot plate structure of claim 1, wherein the protrusion part is formed at a thickness of to of the thickness of the hot plate within the chamber.

3. A continuous molding method which performs molding by heating and compressing a sheet material supplied with a hot plate including a protrusion part, the method comprising: performing primary molding by first supplying the sheet material on the basis of a length unit which is smaller than a set length unit (cutting width) (S100); performing secondary overlapping molding by supplying the primary molded part on the basis of a remaining length unit (S200); and performing air cooling molding by supplying the secondary overlapping molded part to the protrusion part (S300), wherein the primary molding step (S100), secondary overlapping molding step (S200) and air cooling molding step (S300) are continuously performed through the entire sheet material supplied.

4. The continuous molding method of claim 3, wherein the supplied length unit of the sheet material has a length unit of to of the set length unit (cutting width).

Description

BRIEF DESCRIPTION OF DRAWINGS

[0020] FIGS. 1 and 2 are views illustrating conventional press molding devices;

[0021] FIG. 3 is a view illustrating essential constitutional elements of a general press molding device;

[0022] FIG. 4 is a view illustrating a general continuous molding method;

[0023] FIG. 5 is a view illustrating a hot plate structure of a press molding device according to the present invention;

[0024] FIG. 6 is a flow chart illustrating a continuous molding method according to the present invention; and

[0025] FIG. 7 is a view illustrating the continuous molding method according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0026] The present invention for achieving the above effects relates to a hot plate structure of a press molding device and a continuous molding method using same. The detailed descriptions and illustration for the constitution and operation which can be easily known by a skilled person in the art from each drawing and detailed description, and specific technical constitution and operation of elements which are not directly associated with the technical characteristic of the present invention are briefly mentioned or omitted.

[0027] FIG. 5 is a view illustrating a hot plate structure of a press molding device according to the present invention, FIG. 6 is a flow chart illustrating a continuous molding method according to the present invention, and FIG. 7 is a view illustrating the continuous molding method according to the present invention. The hot plate structure of the press molding device and continuous molding method using same are described in detail with reference to the drawings above.

[0028] First, in terms of structure, as illustrated in FIG. 5, the hot plate structure of the press molding device according to the present invention, which includes a chamber 100 and a hot plate 10, includes a protrusion part 10a which protrudes by lengthening both sides of the hot plate 10 to the outside of the chamber 100, characterized in that the protrusion part 10a is formed at a thinner thickness than the thickness of the hot plate 10 within the chamber 100.

[0029] That is, the pressure and temperature applied to the protrusion part 10a are lower than the pressure and temperature applied through the hot plate 10 within the chamber 100 even if the molding operations are performed with the same time and conditions (pressure, temperature, etc.), whereby due to air cooling and temperature control effects, sheet transformation can be inhibited and bubbling can be controlled during the continuous operations through secondary overlapping molding operation to be described later.

[0030] In this case, it is preferable to manufacture the protrusion part 10a to have the thickness of to of the thickness of the hot plate 10 within the chamber 100 to efficiently exhibit the air cooling and temperature control effects, but the thickness is not limited thereto. The protrusion part may be set to have various thicknesses on the premise that the thickness is smaller than the thickness of the hot plate 10 within the chamber 100.

[0031] Meanwhile, the molding time and conditions (pressure, temperature, etc.) are commonly 3 to 15 minutes, 150 to 200 C., and 200 to 300 kg/cm.sup.2, but are not limited thereto. The molding may be performed with various time and conditions in consideration of types, etc. of the sheet.

[0032] Also, the hot plate structure of the press molding device according to the present invention may be applied to a single press or a multi-stage press with at least two press means.

[0033] Next, in terms of molding method, the continuous molding method using the hot plate structure of the press molding device according to the present invention includes the primary molding step (S100), secondary overlapping molding step (S200) and air cooling molding step (S300), as illustrated in FIG. 6.

[0034] For more specific description, as illustrated in FIG. 7, one embodiment of the present invention below is on the basis of 2500 mm of set length unit (cutting width) and 1250 mm of supplied length unit of the sheet material.

[0035] In this case, the cutting width of the present invention is not limited to 2500 mm, but may be variously modified according to the types of sheet, purpose of use, etc. Additionally, the supplied length unit of the sheet material is not limited to 1250 mm, but may be variously modified on the premise that the length is smaller than the cutting width.

[0036] Referring to FIG. 7, in the primary molding step (S100), the sheet material is first supplied to the hot plate 10 on the basis of a unit of 1250 mm among the sheet materials whose cutting width is set to 2500 mm for primary molding.

[0037] Next, in the second overlapping molding step (S200), the primary molded part A is supplied on the basis of a remaining unit of 1250 mm for secondary overlapping molding. In this case, as the process is continuously performed, while the A part is subjected to secondary overlapping molding, B part connected thereto is subjected to primary molding.

[0038] That is, the overlapping molding means that while the A part is subjected to secondary molding, the B part connected thereto is subjected to primary molding. That is, as continuous overlapping molding is performed on the basis of a length unit of to of the cutting width, the boundary part becomes canceled out, thereby being capable of improving the thickness difference and thus enabling uniform physical properties to be obtained.

[0039] Next, in the air cooling step (S300), air cooling is performed as the secondary overlapping molded part A is supplied to the protrusion part 10a. The air cooling molding means a molding step which has air cooling and temperature control effects, that is, a molding step wherein the protrusion part 10a is formed at a thinner thickness than the thickness of the hot plate 10 within the chamber 100 so that the pressure and temperature applied to the protrusion part 10a are lower than the pressure and temperature applied through the hot plate 10 within the chamber 100 even if the molding operations are performed with the same time and conditions (pressure, temperature, etc.), thereby implementing the air cooling and temperature control effects.

[0040] Furthermore, due to the air cooling molding step (S300), sheet transformation can be inhibited and bubbling can be controlled during the continuous operations through the secondary overlapping molding operation.

[0041] Meanwhile, the primary molding step (S100), secondary overlapping molding step (S200) and air cooling molding step (S300) are continuously performed through the entire sheet material supplied. That is, as illustrated in FIG. 7, when A part of the sheet material is in the air cooling molding step (S300), B part connected thereto goes through the secondary overlapping molding step (S200), and C part connected thereto goes through the primary molding step (S100). The above step is continuously performed for other parts connected to the C part, that is, through the entire sheet material.

[0042] Thus, by continuously performing the primary and secondary overlapping molding operations, the present invention can implement the effects of improving the thickness difference of the boundary part, enabling uniform physical properties to be obtained, and inhibiting sheet transformation and controlling bubbling through the air cooling molding to the protrusion part 10a.

[0043] As stated above, the present invention was described with reference to the preferred embodiments. However, it should be construed by a skilled person in the art that the present invention may be variously modified and changed within the range falling under the spirit and area of the present invention described in the claims below.

Modes for Carrying out the Invention

[0044] As a mode for carrying out the invention, the present invention relates to a hot plate structure of a press molding device which includes a chamber 100 and a hot plate 10, the hot plate structure including a protrusion part 10a which protrudes by lengthening both sides of the hot plate 10 to the outside of the chamber 100, wherein the protrusion part 10a is formed at a thinner thickness than the thickness of the hot plate 10 within the chamber 100.

[0045] In this case, the protrusion part 10a is preferably formed at a thickness of to of the thickness of the hot plate 10 within the chamber 100.

[0046] Also, as another mode for carrying out the invention, the present invention relates to a continuous molding method which performs molding by heating and compressing a sheet material supplied with a hot plate 10 including a protrusion part 10a, which includes the steps of performing primary molding by first supplying the sheet material on the basis of a length unit which is smaller than a set length unit (cutting width) (S100); performing secondary overlapping molding by supplying the primary molded part on the basis of a remaining length unit (S200); and performing air cooling molding by supplying the secondary overlapping molded part to the protrusion part 10a (S300), wherein the primary molding step (S100), secondary overlapping molding step (S200) and air cooling molding step (S300) are continuously performed through the entire sheet material supplied.

[0047] In this case, the supplied length unit of the sheet material preferably has a length unit of to of the set length unit (cutting width).

INDUSTRIAL APPLICABILITY

[0048] The present invention continuously performs the primary and secondary overlapping molding operations on the basis of a length unit which is smaller than a set length unit (cutting width), and accordingly cancels out a boundary part, thereby being capable of improving the thickness difference of the boundary part and thus enabling uniform physical properties to be obtained. Additionally, the present invention includes a protrusion part which protrudes by lengthening both sides of a hot plate to the outside of a chamber, wherein the protrusion part is formed at a thinner thickness than the thickness of the hot plate within the chamber so that the pressure and temperature applied to the protrusion part are lower than the pressure and temperature applied through the hot plate within the chamber even if the molding operations are performed with the same time and conditions (pressure, temperature, etc.), whereby due to air cooling and temperature control effects, sheet transformation can be inhibited and bubbling can be controlled during the continuous operations through the aforesaid secondary overlapping molding operation. Accordingly, the present invention is expected to be industrially applicable.