JP6522429B2 - Molding method of thermoplastic sheet - Google Patents

Description

  The present invention relates to a method of molding a thermoplastic sheet and a molding device for a thermoplastic sheet. More specifically, the present invention relates to a method of molding a thermoplastic sheet by heat treatment and a molding apparatus for a thermoplastic sheet used for molding a thermoplastic sheet.

The dry carbon sheet, which is a thermoplastic sheet, is obtained by baking a carbon fiber impregnated with a resin in a high-temperature high-pressure kettle, and an unnecessary resin component is removed to make it lightweight and strong.
In order to form such a dry carbon sheet, it is heated in an oven until it is softened, and pressed against a model to be molded.

  However, when taking out from the oven and molding, it begins to cure for about 1 to 2 seconds by being exposed to the outside air at normal temperature, and pressing for a model to be molded is very good in order to completely cure in about 4 seconds. It is difficult.

As a molding method of this type of dry carbon, for example, the method described in Patent Document 1 is known.
Specifically, as shown in FIG. 11, a dry carbon fabric 101 is prepared, placed over the inner pipe 102, placed in the upper mold 103 and the lower mold 104, vacuumed, added with an adhesive, heated and added. It is a method of pressing and molding a bicycle hub.

  With such a molding method, the manufacturing process of the hub can be simplified because the shell of the hub is manufactured using the tubular dry carbon fabric.

JP, 2011-140277, A

  However, in the invention of Patent Document 1, since the tubular dry carbon fabric is prepared in advance and is molded by heating and pressing in the upper mold and the lower mold in a state of being covered with the inner pipe, the dry carbon is molded There is a need to have a shape that matches the model.

  Therefore, it takes time and effort to mold dry carbon in advance in accordance with the shape of the model to be molded, and in order to press-bond the dry carbon to the model to be molded, it is necessary to pressurize in the heating furnace.

  The present invention has been made in view of the above points, and it is possible to mold a thermoplastic sheet which can be molded according to the shape of a model to be molded without contacting the heated thermoplastic sheet with air. It is an object of the present invention to provide a method and a thermoplastic sheet molding apparatus used for molding a thermoplastic sheet.

  In order to achieve the above object, according to a method of molding a thermoplastic sheet according to the present invention, a first sheet having a plurality of holes perforated, and a second sheet having substantially the same shape as the first sheet. Placing the thermoplastic sheet between the first sheet and the second sheet, and heating the thermoplastic sheet until it is softened. Mounting the molded model on the mounting surface of the molding apparatus having the air intake holes opened, and holding the softened thermoplastic sheet between the first sheet and the second sheet. And covering the intake hole and the model to be molded from the first sheet, and fixing the peripheral portion of the first sheet and the second sheet to the mounting surface of the molding apparatus. Air suction between the first sheet and the second sheet; After the thermoplastic sheet that is molded to the model shape and cured at room temperature, and a step of removing the first sheet and the second sheet from said thermoplastic sheet.

  Here, the first thermoplastic sheet is formed by disposing a thermoplastic sheet between a first sheet in which a plurality of holes are perforated and a second sheet substantially identical in shape to the first sheet. It becomes possible to hold between the sheet and the second sheet.

  In addition, in a state in which the thermoplastic sheet is sandwiched between the first sheet and the second sheet, the thermoplastic sheet can be heated without being exposed to the air by the step of heating until the thermoplastic sheet is softened. It becomes possible.

  Further, in the step of mounting the molding model on the mounting surface of the molding apparatus in which the intake holes are opened, it is possible to perform suction from the mounting surface on which the molding model is placed.

  Further, in a state in which the softened thermoplastic sheet property is sandwiched between the first sheet and the second sheet, the suction hole and the model to be molded are covered from the first sheet, and the first sheet It is possible to take in air in a state in which the model to be molded is sealed by a process of taking in air between the first sheet and the second sheet in a state where the peripheral part of the second sheet is fixed to the mounting surface of the molding apparatus It becomes.

  In addition, after curing the thermoplastic sheet molded into the shape of the model to be molded at normal temperature, the molded thermoplastic sheet can be obtained by the step of removing the first sheet and the second sheet from the thermoplastic sheet. .

  In addition, in the method of molding a thermoplastic sheet according to the present invention, in the case of including the step of covering the second sheet so as to cover the second sheet, the thermoplastic sheet is used. The second sheet and the third sheet can be firmly attached to the model to be molded.

  Furthermore, when the second sheet is broken, it is possible to bring the thermoplastic sheet into close contact with the model to be molded with the third sheet.

  Further, in the method of molding a thermoplastic sheet according to the present invention, in the case where a plurality of thermoplastic sheets are stacked between the first sheet and the second sheet having the same shape as the first sheet, It is possible to mold with a thermoplastic sheet.

  Further, in the method of molding a thermoplastic sheet according to the present invention, after the thermoplastic sheet is disposed between the first sheet and the second sheet, the peripheral portion of the first sheet and the peripheral portion of the second sheet In the case of pressure-bonding each other, it is possible to seal the thermoplastic sheet between the first sheet and the second sheet.

  Further, in the method of molding a thermoplastic sheet according to the present invention, when a felt is disposed between the mounting surface of the molding device and the first sheet, uniform suction can be performed throughout the entire felt. Become.

  In addition, in the method of molding a thermoplastic sheet according to the present invention, when the thermoplastic sheet is a dry carbon sheet, it is possible to form a thermoplastic sheet having excellent elasticity and high strength.

  Further, in the method of molding a thermoplastic sheet according to the present invention, when the first sheet and the second sheet are silicon sheets, the thermoplastic sheet can be molded without problems by having heat resistance and elasticity. Is possible.

  Further, the thermoplastic sheet molding apparatus according to the present invention includes a planar molding table having an intake hole opened in the mounting surface, and a suction unit communicated with the suction hole.

  Here, it is possible to take in air from the mounting surface by the planar molding table in which the suction holes are opened in the mounting surface.

  For example, by placing the model to be molded on the mounting surface of the molding apparatus and covering the intake holes and the model to be molded from the first sheet, it is possible to take in air while the model to be molded is sealed. Become.

  In addition, suction can be performed in a state where the molding table is horizontally fixed by the suction unit communicated with the air suction hole.

  Further, in the thermoplastic sheet molding apparatus according to the present invention, when the intake hole is located at a substantially central position of the mounting surface, efficient intake can be performed.

  In addition, in the thermoplastic sheet molding apparatus according to the present invention, when the suction unit is a vacuum pump, it is possible to suction in a vacuum.

  For example, the first sheet, the thermoplastic sheet, and the second sheet are formed on the outer surface of the model to be molded by placing a vacuum between the first sheet, the thermoplastic sheet, and the second sheet on the mounting surface. It becomes possible to make it adhere.

According to the method of molding a thermoplastic sheet of the present invention, it is possible to mold the heated thermoplastic sheet in accordance with the shape of a model to be molded without being exposed to the air.
Also, according to the thermoplastic sheet molding apparatus of the present invention, it is possible to mold the thermoplastic sheet in accordance with the shape of the model to be molded.

It is a schematic diagram for demonstrating the 1st sheet | seat in the 1st process of an example of the shaping | molding method of the thermoplastic sheet to which this invention is applied. It is a schematic diagram for demonstrating the state which mounted the thermoplastic sheet on the 1st sheet in the 1st process of an example of the molding method of the thermoplastic sheet to which the present invention is applied. It is a schematic diagram for demonstrating the 2nd sheet | seat in the 1st process of an example of the shaping | molding method of the thermoplastic sheet to which this invention is applied. The cross-sectional schematic diagram (A) for demonstrating the heating condition in the 2nd process of an example of the forming method of the thermoplastic sheet to which the present invention is applied, and the 2nd process of an example of the forming method of a thermoplastic sheet to which the present invention is applied It is a plane schematic diagram (B) for demonstrating the heating state in. The side surface cross-sectional schematic diagram (A) in the 3rd process of the molding method of the thermoplastic sheet to which the present invention is applied, and the plane schematic diagram in the 3rd process of the molding method of the thermoplastic sheet to which the present invention ). The side surface cross-section schematic diagram (A) in the 4th process of the molding method of the thermoplastic sheet to which the present invention is applied, and the expansion model of the principal part in the 4th process of the molding method of the thermoplastic sheet It is a figure (B). The cross-sectional schematic view (A) in the 5th process of the molding method of the thermoplastic sheet to which the present invention is applied, and the molding state of the thermoplastic sheet in the 5th process of the molding method of the thermoplastic sheet to which the present invention is applied It is a cross-sectional schematic diagram (B) for demonstrating. It is the side cross-sectional schematic diagram (A) in the other example of the shaping | molding method of the thermoplastic sheet to which this invention is applied, and the expansion schematic diagram (B) of the principal part in the other example of the thermoplastic sheet to which this invention is applied. The side surface cross-sectional schematic diagram (A) for demonstrating an example which took in corrugation in the shaping | molding method of the thermoplastic sheet to which this invention is applied, and an example of the shaping | molding which took the corrugation in the shaping | molding method of the thermoplastic sheet to which this invention is applied It is a schematic diagram (B) for demonstrating. It is a schematic diagram for demonstrating an example of the shaping | molding apparatus of the thermoplastic sheet to which this invention is applied. It is a schematic diagram for demonstrating an example of the shaping | molding method of the conventional dry carbon.

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

First Embodiment
[First step]
FIG. 1 is a schematic view for explaining a first sheet in a first step of an example of a thermoplastic sheet molding method to which the present invention is applied, and FIG. 2 is an example of a thermoplastic sheet molding method to which the present invention is applied. It is a schematic diagram for demonstrating the state which mounted the thermoplastic sheet on the 1st sheet | seat in a 1st process. Furthermore, FIG. 3 is a schematic view for explaining a second sheet in the first step of an example of a method of molding a thermoplastic sheet to which the present invention is applied.

  Here, the first sheet 1 is formed of a square silicon sheet having a thickness of about 1 mm, and air vent holes 2, 2,... Having an inner diameter of about 1 mm are formed every about 5 mm.

  Each side (4, 4A, 4B, 4C) of the first sheet 1 is formed on each side of the fixing plate 3 on an annular fixing plate 3 in which the first sheet 1 is smaller than the first sheet 1. A fixed width is provided from (5, 5A, 5B, 5C), and it mounts so that it may protrude (refer FIG. 1).

Next, the dry carbon sheet 6 is placed as a thermoplastic sheet in the frame of the fixing plate 3 of the first sheet 1 (see FIG. 2).
The dry carbon sheet is formed into a sheet by baking carbon fiber impregnated with a resin in a high temperature high pressure kettle, and has a property of being softened by heating in a range of 130 ° C to 180 ° C.
Such a dry carbon sheet has, for example, a thickness of 0.2 mm to 3.0 mm, and the thickness is selected according to the condition of the molded product, or a plurality of dry carbon sheets are stacked.

Subsequently, a second sheet 7 formed of a silicon sheet and in the same shape as the first sheet 1 is placed on the first sheet 1 (see FIG. 3).
As a result, the dry carbon sheet 6 is sandwiched between the first sheet 1 and the second sheet 7.

Further, a fixing plate 3A having the same shape as the fixing plate 3 is placed on the second sheet 7 so as to overlap the fixing plate 3 (see FIG. 3).
Thereby, the dry carbon sheet 6 is in the state of being enclosed between the first sheet 1 and the second sheet 7 in the frame of the fixing plate (3, 3A).

[Second step]
FIG. 4 (A) is a schematic cross-sectional view for explaining a heating state in the second step of an example of a method of molding a thermoplastic sheet to which the present invention is applied, and FIG. 4 (B) is a thermoplastic sheet to which the present invention is applied. It is a mimetic diagram for explaining the heating state in the 2nd process of an example of the molding method of 1.

  Here, each side of the fixing plate (3, 3A) is sandwiched by, for example, clips 8, 8 · · · which can endure the heating temperature (about 180 ° C) in the oven 9, and 150 ° C in the oven 9. It heats for about 15 minutes within the range of -180 degreeC.

[Third step]
FIG. 5 (A) is a side cross-sectional schematic view in the third step of one example of the thermoplastic sheet molding method to which the present invention is applied, and FIG. 5 (B) is one example of the thermoplastic sheet molding method to which the present invention is applied. It is a plane schematic diagram in the 3rd process.

  Here, as a preparation, for example, the molding apparatus 10 is installed on the work bench A with a fixture B such as a vise. In the forming apparatus 10, an air intake hole 12 is opened substantially at the center of a forming table 11 formed of a steel plate which is larger than the area of the first sheet and the second sheet (not shown).

  Furthermore, a support pipe portion 13 in communication with the intake hole 12 is provided, and a vacuum pump 15 as a suction portion is attached to the support pipe portion 13 via a hose 14.

The felt 17 is placed on the mounting surface 16 of the molding table 11 having such a configuration so as to cover the intake hole 12 (see FIG. 5A).
The felt 17 is sized to fit within the frame of a fixing plate (not shown).

By the way, felt is mainly composed of wool, and it is simply mechanically interlocked into a uniform layer without weaving or knitting, and besides wool, synthetic fibers and other animal hair and plant fibers etc. It is made by mixing.
In the felt 17 of such a configuration, since air gaps are uniform, air suction from the air suction hole 12 can perform uniform air suction throughout the entire surface of the felt 17.
Further, the molded model 18 is placed substantially at the center of the felt 17.

[Step 4]
FIG. 6A is a side cross-sectional schematic view in the fourth step of an example of a thermoplastic sheet molding method to which the present invention is applied, and FIG. 6B is an example of a thermoplastic sheet molding method to which the present invention is applied. It is an expansion schematic diagram of the important section in the 4th process.

  Here, the first sheet 1, the dry carbon sheet 6 and the second sheet 7 in the state of being heated until the dry carbon sheet 6 is softened in an oven (not shown) in the above [second step] are molded A molded model 18 mounted on the felt 17 of the mounting surface 16 of the table 11 is covered from the first sheet 1 (see FIG. 6A).

  Thus, the dry carbon sheet 6 is sandwiched between the first sheet 1 and the second sheet 7, and the outer surface of the molded model 18 in a state of being softened without being exposed to the outside air and without lowering the temperature. The first sheet 1 is in close contact with each other.

  Furthermore, by mounting the fixing plates (3, 3A) on the mounting surface 16 of the molding table 11, the peripheral portions of the first sheet 1 and the second sheet 7 are fixed to the mounting surface 16, and the fixing plates The molded model 18 is sealed in the frame (3, 3A).

  From such a state, as described in detail in FIG. 5A, suction is performed by the vacuum pump 15 so that suction is performed through the felt 17 within the frame of the fixed plate (3, 3A).

  Here, the dry carbon sheet 6 is included in the dry carbon sheet 6 by suctioning between the first sheet 1 and the second sheet 7 through the air vent holes 2, 2,... Provided in the first sheet 1. Air is also inhaled (see FIG. 6B).

  Thereby, the dry carbon sheet 6 is molded by adsorbing to the outer surface of the model to be molded 18 in a state in which the dry carbon sheet 6 is in close contact with the first sheet 1 and the second sheet 7.

[Step 5]
FIG. 7 (A) is a schematic cross-sectional view in the fifth step of an example of a thermoplastic sheet molding method to which the present invention is applied, and FIG. 7 (B) is a fifth example of the thermoplastic sheet molding method to which the present invention is applied. It is a cross-sectional schematic diagram for demonstrating the molding state of the thermoplastic sheet in 5 processes.

Here, a state in which the first sheet 1 and the second sheet 7 are adsorbed to both side surfaces of the dry carbon sheet 6 by suctioning in a vacuum between the first sheet 1 and the second sheet 7 It becomes.
In such a state, the dry carbon sheet 6 is cured by natural cooling or cooling with a fan or the like (see FIG. 7A).

  Thus, after the dry carbon sheet 6 is cured, the first sheet 1 and the second sheet 7 are removed from the dry carbon sheet 6 to complete the molding (see FIG. 7B).

  In the method of molding a thermoplastic sheet according to the present invention as described above, the dry carbon sheet, which is a thermoplastic sheet, is sandwiched between the first sheet and the second sheet so that it can be removed from the oven. It becomes possible to maintain the softened state of the dry carbon sheet.

  In addition, the air contained in the dry carbon sheet is drawn in by suctioning air between the first sheet and the second sheet through the air vent holes perforated in the first sheet, thereby oxidizing the dry carbon sheet. It is possible to prevent.

  Further, by adsorbing the first sheet and the second sheet to the outer surface of the model to be molded in a state in which the first sheet and the second sheet are in close contact with the dry carbon sheet, highly accurate molding is possible.

Another Example of First Embodiment
FIG. 8 (A) is a side cross-sectional schematic view in another example of a method of molding a thermoplastic sheet to which the present invention is applied, and FIG. 8 (B) is a main part of another example of a thermoplastic sheet to which the present invention is applied. It is an expansion schematic diagram.

  Here, the first sheet 1, the dry carbon sheet 6, the second sheet 7, and the third sheet 20 in the state of being heated until the dry carbon sheet 6 is softened in an oven (not shown) are molded on the molding table 11. The molded model 18 mounted on the felt 17 of the mounting surface 16 is covered so as to cover the first sheet 1 (see FIG. 8A).

  Thereby, the dry carbon sheet 6 is in a state of being sandwiched between the first sheet 1 and the second sheet 7, and the third sheet 20 is made to cover the first sheet 1 and the second sheet 7. It will be covered.

  Therefore, the dry carbon sheet 6 is brought into close contact with the outer surface of the molded model 18 through the first sheet 1 in a softened state without being exposed to the outside air and without lowering the temperature.

  Further, the first sheet 1 and the second sheet 7 are fixed to the mounting surface 16 of the molding table 11 by the third sheet 20, and the molded model 18 is formed between the third sheet 20 and the mounting surface 16. Is sealed.

  From such a state, as described in detail in FIG. 5A, suction is performed by the vacuum pump 15 so that suction is performed through the felt 17.

  Here, intake air flows between the first sheet 1, the second sheet 7, the third sheet 20, and the placement surface 16 through the air vents 2, 2,... Provided in the first sheet 1. The air contained in the dry carbon sheet 6 is also inhaled by being driven (see FIG. 8B).

  As a result, the dry carbon sheet 6 is adsorbed to the outer surface of the molded model 18 in a state in which the dry carbon sheet 6 is in close contact with the first sheet 1 and the second sheet 7.

Furthermore, the suction is performed between the third sheet 20 and the placement surface 16 so that the third sheet 20 presses the second sheet 7 so that the dry carbon sheet 6 is transferred to the model 18 to be molded. Press down.

  In such a state, the dry carbon sheet 6 adheres to the outer surface of the model to be molded 18 so that the dry carbon sheet 6 can be molded with high accuracy.

<Modification of First Embodiment>
Fig. 9 (A) is a side cross-sectional schematic view for explaining an example in which the corrugation is incorporated in the method of molding a thermoplastic sheet to which the present invention is applied, and Fig. 9 (B) is a molding of a thermoplastic sheet It is a schematic diagram for demonstrating an example of the shaping | molding which took in the corrugation in the method.

  Here, the cylindrical member 21 formed of an elastic member such as rubber is disposed at a location where the outer surface of the molded model 18 is to be reinforced (see FIG. 9A).

  Then, the first sheet 1, the dry carbon sheet 6, the second sheet 7 and the third sheet 20 are heated in the oven (not shown) until the dry carbon sheet 6 is softened. A molded model 18 placed on the felt 17 of the placement surface 16 is covered from the first sheet 1 (see FIG. 9A).

  From such a state, as described in detail in FIG. 5A, suction is performed by the vacuum pump 15 so that suction is performed through the felt 17.

  Thereby, the dry carbon sheet 6 adheres to the molded model 18 and the cylindrical member 21 through the first sheet 1 to manufacture a molded product of the dry carbon sheet 6 having the corrugation 22 formed on the outer surface. (See FIG. 9B).

  In another example of the first embodiment, the third sheet larger than the second sheet is covered so as to cover the second sheet, but the third sheet is necessarily provided. There is no need.

  However, it is desirable that the third sheet be provided in that the thermoplastic sheet can be firmly adhered to the model to be molded between the second sheet and the third sheet by covering the third sheet.

  In the first embodiment, another example of the first embodiment, and a modified example of the first embodiment, the first sheet and the first sheet have substantially the same shape. A plurality of thermoplastic sheets are stacked between the second sheet and the second sheet, but it is not necessary to stack a plurality of thermoplastic sheets.

  For example, although it is necessary to stack a plurality of sheets in a molded product in which emphasis is placed on high resistance, a single article may be used which does not require high resistance.

  In the first embodiment, after arranging the thermoplastic sheet between the first sheet and the second sheet, the peripheral portion of the first sheet and the peripheral portion of the second sheet are crimped to each other. However, it is not necessary to crimp in this manner.

  However, it is desirable to press-bond the peripheral portion of the first sheet and the peripheral portion of the second sheet to each other in that the thermoplastic sheet can be sandwiched between the first sheet and the second sheet.

  Further, in <First Embodiment>, <Other Example of First Embodiment>, and <Modification of First Embodiment>, the mounting surface of the molding apparatus and the first sheet There is no need to place a felt, although the felt is placed between them.

  However, the felt is disposed between the mounting surface of the molding apparatus and the first sheet in that negative pressure is generated by suction between the mounting surface and the felt, and uniform suction can be performed through the felt. It is desirable to do.

  In the first embodiment, another example of the first embodiment, and a modification of the first embodiment, a dry carbon sheet is used as the thermoplastic sheet. However, it is not necessary to use dry carbon sheets.

  For example, in addition to the dry carbon sheet as the thermoplastic sheet, glass fibers or high-strength fibers in which an aramid fiber is impregnated with a thermoplastic resin may be used.

  In the first embodiment, another example of the first embodiment, and a modification of the first embodiment, silicon sheets are used as the first sheet and the second sheet. Although used, it is not necessary to use a silicon sheet.

  For example, any material sheet may be used as long as it is a synthetic resin sheet having heat resistance and heat insulation.

  In the first embodiment, another example of the first embodiment, and a modification of the first embodiment, the thermoplastic sheet is heated by an oven until it is softened. Although there is no need to heat in the oven.

  For example, as long as it can heat in the range of 130 degreeC-180 degreeC which a thermoplastic sheet softens, such as an electric heater, it does not matter.

Second Embodiment
FIG. 10 is a schematic view for explaining an example of a thermoplastic sheet molding apparatus to which the present invention is applied.

  The molding apparatus 10 shown here comprises a molding table 11 having an intake hole 12 opened substantially at the center of the mounting surface 16 and a vacuum pump 15 disposed in communication with the intake hole 12.

  Here, the molding table 11 is formed with a planar mounting surface 16 larger than the surface area of the first sheet 1 described in detail in FIG. An intake hole 12 having an inner diameter of about 1 cm is opened substantially at the center of the mounting surface 16.

  Further, a support pipe portion 13 is connected to the lower surface of the molding table 11 at a right angle to the lower surface of the molding table 11 in the air intake hole 12.

  Further, along the longitudinal direction of the outer peripheral surface of the support tube portion 13, the holding plate portion 19 is fixed at a right angle. The molding table 11 can be mounted horizontally by holding the holding plate portion 19 with a tool (not shown) such as a vise.

  Further, a vacuum pump 15 is attached to the support pipe portion 13 via a hose 14. The vacuum pump 15 is, for example, a small oil rotary vacuum pump of a motor direct connection type, and has characteristics of high speed rotation, small size, and high pumping speed (10 L / min) as compared with the belt type.

  By using the vacuum pump 15 as described above, it becomes possible to instantly form a predetermined shape by applying a vacuum immediately before the thermoplastic sheet is cured.

  In the apparatus for molding a thermoplastic sheet according to the present invention having the above-described configuration, as described in detail in [Third step] and [fourth step] of the above-mentioned <First embodiment>, mounting of the molding table 11 is performed. The felt 17 is placed on the surface 16 so as to cover the air intake hole 12 (see FIG. 5A).

  Furthermore, a molded model 18 having a surface area that can be covered with a dry carbon sheet is placed on the felt 17 (see FIG. 5A).

  Next, a molded model 18 in which the dry carbon sheet 6 in a heated state until softened in an oven (not shown) is placed on the felt 17 of the mounting surface 16 of the molding table 11 from the first sheet 1 To cover (see FIG. 6A).

  Here, by suctioning with a vacuum pump (not shown), suction is performed in the frame of the fixed plate (3, 3A) through the felt 17 (see FIG. 6A).

  In this manner, the dry carbon sheet 6 is included by the intake between the first sheet 1 and the second sheet 7 being performed through the air vent holes 2, 2,... Provided in the first sheet 1. Also, air is taken in (see FIG. 6B).

  Thereby, the dry carbon sheet 6 is molded by adsorbing to the outer surface of the model to be molded 18 in a state in which the dry carbon sheet 6 is in close contact with the first sheet 1 and the second sheet 7.

  In the thermoplastic sheet molding apparatus of the present invention, an example of use in <the first embodiment> will be described in detail, but <the other example of the first embodiment>, or <the first embodiment> It is a matter of course to use in the modification of the first embodiment.

  According to the present invention, the model to be molded is placed on the molding table, and the first sheet and the second sheet in which the thermoplastic sheet is sealed are covered on the model to be molded, and suction is performed instantaneously by the vacuum pump. It becomes possible to perform molding.

  In the second embodiment, although the intake hole is located at a substantially central position of the mounting surface, it is not always necessary to place the intake hole at a substantially central position of the mounting surface.

  However, in terms of efficient intake, it is desirable that the intake hole be located approximately at the center of the mounting surface.

  In the second embodiment, a vacuum pump is used as the suction unit, but the vacuum pump is not necessarily required.

  However, it is desirable to use a vacuum pump in that the thermoplastic sheet can be reliably adsorbed to the outer surface of the model to be molded.

1 first sheet 2 air vent hole 3, 3A fixing plate 4, 4A, 4B, 4C each side 5 of the first sheet 5, 5A, 5B, 5C each side of fixing plate 6 dry carbon sheet 7 second sheet 8 clip 9 Oven 10 Molding apparatus 11 Molding table 12 Air intake hole 13 Support tube 14 Hose 15 Vacuum pump 16 Mounting surface 17 Felt 18 Molded model 19 Clamping plate 20 Third sheet 21 Cylindrical member 22 Corrugation

Claims (4)

Placing a thermoplastic sheet between a first sheet perforated with a plurality of holes and a second sheet substantially identical in shape to the first sheet;
Heating the thermoplastic sheet until it is softened in a state in which the thermoplastic sheet is sandwiched between the first sheet and the second sheet;
Placing a felt so as to cover the air intake hole on the mounting surface of the molding apparatus in which the air intake hole is opened;
Placing a model to be molded on the felt;
The thermoplastic sheets the softened state sandwiched between said first sheet and said second sheet, covered with a pre-Symbol the molding model so as to cover from the first sheet, the first sheet And a step of suctioning air between the first sheet and the second sheet in a state where the peripheral portion of the second sheet is fixed to the mounting surface of the molding apparatus;
And a step of removing the first sheet and the second sheet from the thermoplastic sheet after curing the thermoplastic sheet molded into the shape of the model to be molded at normal temperature. The method of molding a thermoplastic sheet according to claim 1, further comprising the step of covering a third sheet larger than the second sheet so as to cover the second sheet. The method of molding a thermoplastic sheet according to claim 1 or 2, wherein a plurality of thermoplastic sheets are stacked between the first sheet and a second sheet having the same shape as the first sheet. After arranging the thermoplastic sheet between the first sheet and the second sheet, the peripheral portion of the first sheet and the peripheral portion of the second sheet are crimped to each other. Item 4. A method of molding a thermoplastic sheet according to Item 3.

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