JP2001018288A - Apparatus for molding synthetic resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the temperature difference of molding molds by forming one molding mold from a core forming an inner surface and a mold main body supporting the core enclosingly and setting up the temperature of the core differently from that of the mold main body. SOLUTION: A molding apparatus is formed from a lower mold 2 as a molding mold and an upper mold 3, and inner surfaces 4, 5 facing each other are formed in the lower mold 2 and the upper mold 3. By holding a heated synthetic resin sheet between the inner surfaces 4, 5, shapes corresponding to the inner surfaces 4, 5 of the sheet 1 are formed. In order to make the temperature of the inner surface 5 contacting the upper surface of the sheet 1 lower than that of the inner surface 4 contacting the lower surface, the temperature of the inner surface 4 on the lower side is set up at 45 deg.C, and the temperature of the in surface 5 on the upper side is set up at 15 deg.C. In this way, the temperature difference of the molding mold can be changed to improve the applicability of the molding mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin sheet molding apparatus.

[0002]

2. Description of the Related Art Conventionally, there has been known a molding apparatus in which a synthetic resin sheet is disposed between a pair of molds, and the synthetic resin sheets are sandwiched between inner surfaces of the molds facing each other. . Further, a cut portion circumscribing the other mold is formed in one of the molds, and a trimming process of cutting unnecessary portions of the synthetic resin sheet by the cut portion can be performed simultaneously with the mold clamping.

[0003] Further, in such a pair of molds, the temperature of the inner surface of one mold may be different from the temperature of the inner surface of the other mold. In other words, depending on the synthetic resin sheet, a skin material having heat insulating properties may be laminated on one side, so that the temperature of the inner surface where such a skin material is in contact may be set lower than the inner surface on the opposite side. is there. The position of the trimming cut portion is precisely adjusted in advance in consideration of the difference in the coefficient of thermal expansion due to such a temperature difference.

[0004]

However, according to such a conventional technique, when each mold is adjusted to a predetermined temperature difference, the cut portion formed in one mold becomes the other. Although it is possible to accurately cut out the unnecessary portion of the synthetic resin sheet at the edge of the cutting part and the edge of the counterpart accurately by circumscribing the molding die of May be misaligned, causing strong interference with the partner's mold at the time of mold clamping, resulting in breakage, or conversely, a gap between the partner's mold and resulting in poor cutting. Therefore, conventionally, it is impossible to change the temperature difference of the mold, and the mold can be used only at a fixed temperature difference.

The present invention has been made by paying attention to such a conventional technique, and provides a highly versatile synthetic resin sheet molding apparatus capable of changing the temperature difference of a molding die. .

[0006]

According to the first aspect of the present invention,
A pair of molding dies was formed so that the synthetic resin sheet was sandwiched between the opposing inner surfaces, and a cutting portion was formed in one molding die to circumscribe the other molding die and trim unnecessary portions of the synthetic resin sheet. A molding device for a synthetic resin sheet, wherein the one molding die is formed from a core forming an inner surface and a mold body supporting the core so as to wrap the core, and the core is heated to a temperature different from that of the mold body. Can be set.

According to the first aspect of the present invention, since the inner surface that comes into contact with the synthetic resin sheet is formed on the core and the cut portion is formed on another mold body, the temperature of the core is changed. Also does not affect the position of the cut. Therefore, the temperature difference of the mold can be changed, and the versatility of the mold can be improved.

[0008] In the second aspect of the present invention, a heat insulating material is interposed between the core and the mold body.

According to the second aspect of the present invention, since the heat insulating material is interposed between the core and the mold body, the mold body is less affected by the temperature of the core.

According to the third aspect of the present invention, a gap is formed between the core and the mold body.

According to the third aspect of the present invention, since the gap is formed between the core and the mold main body, the mold main body is hardly affected by the temperature of the core also in this point.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. The synthetic resin sheet 1 of this embodiment has a structure in which a nonwoven fabric material having a low thermal conductivity is laminated on the lower surface of a thermoplastic resin sheet.

On the other hand, the molding device is formed of a lower mold 2 and an upper mold 3 as a "mold". Lower mold 2 and upper mold 3
Are formed with opposing inner surfaces 4 and 5. By sandwiching the heated synthetic resin sheet 1 between the inner surfaces 4 and 5, a shape corresponding to the inner surfaces 4 and 5 of the synthetic resin sheet 1 is given. Can be.

A cut portion 6 circumscribing the side surface of the lower die 2 is formed downward around the upper die 3. That is, when clamping the lower mold 2 and the upper mold 3, the synthetic resin sheet 1 is cut between the edge 6 e of the cutting portion 6 and the corresponding edge 2 e of the lower mold 2 so that unnecessary portions can be removed. (Trimming process).

The lower mold 2 is formed as a single piece, while the upper mold 3 is divided into a core 7 and a mold body 8.
The core 7 forms the inner surface 5 and is smaller in weight than the mold body 8. The mold body 8 is supported so as to wrap the core 7 and is heavier than the core 7. The cutting portion 6 is formed on the mold body 8. Further, a heat insulating material 9 is interposed between the upper surface of the core 7 and the lower surface of the mold body 8, and a gap 10 is also provided between the side surface of the core 7 and the mold body 8. .

The lower mold 2 having such a structure and the upper mold 3 composed of the core 7 and the mold body 8 are each provided with a plurality of cooling pipes P.
And a heater wire (not shown) are provided, each of which can be adjusted to an arbitrary temperature.

In this embodiment, since a skin material (not shown) is adhered to the upper surface of the synthetic resin sheet 1 to be molded, the inner surface 5 contacting the upper surface of the synthetic resin sheet 1 contacts the lower surface. The temperature needs to be lower than that of the inner surface 4. Specifically, the temperature of the lower inner surface 4 is 45 ° C.
The temperature of the upper inner surface 5 is set to 15 ° C.
Note that the mold body 8 is adjusted to the same temperature (45 °) as the lower mold 2.

According to this embodiment, since the temperature of the lower inner surface 4 is set higher than that of the upper inner surface 5,
Even with a structure in which a skin material having a high heat insulating property is laminated on the upper surface of the synthetic resin sheet 1, the synthetic resin sheet 1 can be reliably formed into a shape corresponding to the inner surfaces 4, 5. Also, even if the temperature of the core 7 is made different from that of the lower mold 2, the mold body 8 having the cut portion 6 is formed.
Is the same temperature as the lower mold 2 (because it has nothing to do with the core 7), the positional relationship between the edge 6e of the cut portion 6 and the edge 2e of the lower mold 2 does not change, and the reliable synthetic resin sheet 1 Trimming can be performed.

The cutting performance of the cutting section 6 does not change even when the synthetic resin sheet 1 to be formed changes and the temperature of the core 7 changes. By changing the temperature of core 7,
The core 7 itself thermally expands or contracts somewhat, but is surrounded by the large mold body 8 and is pressed down by the mold body 8 to change the position of the cutting portion 6. is not. Therefore, the temperature difference between the lower mold 2 and the upper mold 3 can be freely changed, and the versatility of the mold can be improved.

Further, according to this embodiment, since the heat insulating material 9 and the gap 10 are interposed between the core 7 and the mold body 8, the mold body 8 is particularly affected by the temperature of the core 7. It does not affect the position of the cutting portion 6 at all.

[0021]

According to the first aspect of the present invention, since the inner surface that comes into contact with the synthetic resin sheet is formed on the core and the cut portion is formed on another mold body, the temperature of the core is changed. This does not affect the position of the cut. Therefore, the temperature difference of the mold can be changed, and the versatility of the mold can be improved.

According to the second aspect of the present invention, since the heat insulating material is interposed between the core and the mold body, the mold body is less affected by the temperature of the core.

According to the third aspect of the present invention, since the gap is formed between the core and the mold main body, the mold main body is hardly affected by the temperature of the core also in this point.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a molding die before clamping.

FIG. 2 is a sectional view showing the mold of FIG. 1 after clamping;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin sheet 2 Lower die (molding die) 3 Upper die (molding die) 4, 5 Inner surface 6 Cutting part 7 Core 8 Mold main body 9 Heat insulating material 10 Gap P Cooling pipe

Claims (3)

[Claims] 1. A cutting method in which a synthetic resin sheet is sandwiched between opposing inner surfaces of a pair of molds, and an unnecessary portion of the synthetic resin sheet is trimmed on one mold by circumscribing the other mold. A molding apparatus for a synthetic resin sheet having a portion formed therein, wherein said one molding die is formed of a core forming an inner surface and a mold main body supporting the core so as to wrap the core, and the core is a mold main body. A synthetic resin sheet molding apparatus, wherein the temperature can be set to a temperature different from that of the synthetic resin sheet. 2. The synthetic resin sheet molding apparatus according to claim 1, wherein a heat insulating material is interposed between the core and the mold body. Molding equipment. 3. The synthetic resin sheet molding apparatus according to claim 1, wherein a gap is formed between the core and the mold body. Equipment for molding resin sheets.