JP2523559Y2 - Thermoforming mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoforming die for molding an interior material such as a molded ceiling material or a door trim of a car or a house by pressing and heating it into a predetermined shape.

[0002]

2. Description of the Related Art For example, on the interior ceiling of an automobile, a skin such as vinyl chloride is laminated on the surface of a plastic material, and this is sandwiched between a pair of heated mold halves to apply pressure and heat to form a plastic. Some use a molded ceiling formed by molding into a predetermined shape at the same time as pressing the material and the skin.

FIG. 4 is a side view schematically showing an example of a conventional thermoforming apparatus for performing this type of thermoforming. FIG.
, A thermoforming apparatus 101 includes a thermoforming mold 102 composed of a pair of upper and lower mold halves 102A and 102B that are heated to each other, and the thermoforming mold 102 is detachably attached. Also, a pair of mold halves 102
A and 102B, one mold half 102A is fixed to the apparatus body fixing portion 103A, and the other mold half 10A
2B is fixed to the apparatus main body movable section 103B which is moved up and down with respect to the apparatus main body fixing section 103A.

In the thermoforming apparatus 101, when the apparatus main body movable portion 103B is moved upward together with the molding die half 102B, and the distance between the pair of molding die halves 102A and 102B is large. For example, a plate-shaped material 104 for the interior ceiling of an automobile in which a skin made of vinyl chloride or the like is laminated on a surface of a plastic material is disposed on a mold half 102A, and then the mold is formed together with the apparatus main body movable portion 103B. When the half body 102B is lowered and the material 104 is sandwiched between the mold half body 102A and the mold half body 102B and pressed and heated, a molded article having a predetermined shape (this In the case of the example, molded ceiling)
Is obtained. After the molding, the molding die half 102B is raised together with the apparatus main body movable portion 103B, so that the molding die half 102A and the molding die half 102B are largely separated from each other again, and the molded product is taken out in this state. .
Next, a new material 104 is placed on the mold half 102 and the same operation is repeated again.

[0005] The temperature of the molding die 102 is set to about 150 by the built-in heater (not shown) when the molding ceiling of an automobile is molded.
℃, the mold surface temperature of the mold half body 102B is heated to about 120 ° C. and maintained.

[0006]

In the above-mentioned conventional thermoforming apparatus, the material 104 in a cooled state is directly placed on the mold half 102A without performing preheating or the like, and the material 104 is placed in a pair. Pressing and heating are performed by the mold halves 102A and 102B. Therefore, it takes time for the heat to sufficiently spread to the center of the material 104 and be molded,
There was a problem that productivity was poor. Material 104
Because it takes time for the heat to spread sufficiently to the center and to be molded, the surface side is more strongly heated than the center and easily deforms on the surface side, and even thermal deformation is obtained In particular, there is a problem that molding is difficult when deep drawing is performed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a thermoforming die which can perform molding quickly and neatly and has excellent productivity.

[0008]

In order to achieve the above object, the present invention comprises a pair of heated mold halves, and presses and heats the material between the pair of mold halves. In a thermoforming mold for molding the material into a predetermined shape, a preheating chamber for applying preheating to the material before molding by using residual heat of the heated mold half is formed by the mold half. Are provided in any one of the above.

[0009]

According to this structure, the material before molding can be pre-heated in the pre-heating chamber by utilizing the residual heat of the molding die, and the pre-heated material can be molded. The time required for the metal to spread is shortened, and molding in a short time becomes possible. In addition, since molding can be performed in a short time, the time during which the heating section is in contact with the surface of the material is also shortened, and the influence of heat on the surface of the material can be reduced.
Furthermore, deep drawing becomes possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration side view of a thermoforming apparatus shown as one embodiment of the present invention.

In FIG. 1, a thermoforming apparatus 1 includes a thermoforming mold 2 composed of a pair of upper and lower molding halves 2A and 2B which are heated to each other. The thermoforming mold 2 is detachably mounted. I have. In addition, a pair of mold halves 2A, 2B
Among them, one mold half 2A is fixed to the apparatus main body fixing portion 3A, and the other mold half 2B is fixed to the device main body fixing portion 3A.
Is fixed to the movable portion 3B of the apparatus main body which is moved up and down with respect to. In FIG. 2, the thermoforming die 2 is connected to the thermoforming device 1.
It is shown in a more detached state.

Further, before molding, the mold half 2B temporarily stores a plate-like material 4 for an interior ceiling of an automobile in which a skin made of, for example, vinyl chloride is laminated on a surface of a plastic material. A preheating chamber 10 for preheating the material 4 is provided. Further, a partition shelf or the like is provided inside the preheating chamber 10 so that a plurality of raw materials 4 before molding can be stored therein, though not shown.

The temperature of the mold 2 here varies depending on the material to be molded. However, in the case of molding a molded ceiling of an automobile, the mold 2A is molded by a built-in heater (not shown). Surface temperature of about 150 ° C, mold half 2
B is heated until the mold surface temperature reaches about 120 ° C., and this is maintained. Also, the preheating chamber 1 of the mold half 2B
The temperature in 0 is maintained at about 60 ° C. by the residual heat during molding heated to about 120 ° C., and the material 4 temporarily stored before molding is reduced to an internal temperature of the material 4 in the preheating chamber 10. About 6
Preheat until it is close to 0 ° C.

Next, the forming operation of the thermoforming device 1 will be described. First, a plurality of materials 4 are temporarily stored in the preheating chamber 10 and preheated. In addition, when the apparatus main body movable portion 3B is moved upward together with the molding half 2B and the pair of molding halves 2A and 2B are largely separated from each other, one sheet from the preheating chamber 10 is removed. Material 4
Is taken out and placed on the mold half 2A.

Next, the mold half 2B is lowered together with the apparatus main body movable portion 3B, and the material 4 which has been preheated is sandwiched between the mold half 2A and the mold half 2B.
When heated, a molded article of a predetermined shape (molded ceiling in this embodiment) is obtained at the same time when the plastic material and the skin are pressed.

After the molding, the mold half 2B is raised together with the apparatus main body movable portion 3B to form the mold half 2A and the mold half 2B.
Is greatly separated again, and the molded article is taken out in this state. FIG. 3 shows the molded ceiling 14 for an automobile thus formed.

Next, a new material 4 preheated in the preheating chamber 10 is taken out of the preheating chamber 10 and placed on the mold half 2A, and the same operation is repeated again. In the preheating chamber 10, a new material 4 to be preheated is stored.

Therefore, in the thermoforming apparatus configured as described above, the material 4 before molding is utilized by utilizing the residual heat of the thermoforming mold 2.
Is preheated in the preheating chamber 10 and the preheated material 4 is molded, so that the time required for the heat necessary for molding to reach the center of the material 4 at the time of molding is shortened, and Molding becomes possible. In addition, since molding can be performed in a short time, the time during which the heating unit is in contact with the surface of the material 4 is also reduced, so that the influence of heat on the surface of the material 4 can be reduced, and furthermore, deep drawing can be performed. .

In the above embodiment, the case where the preheating chamber 10 is formed on the mold half 2B side has been disclosed.
Mold half 2A, or both mold halves 2A, 2
B may be provided. Further, the present invention is not limited to the case where a molded ceiling of an automobile is molded, but can be applied to other general moldings.

[0020]

As described above, according to the thermoforming die of the present invention, the material before molding is preheated in the preheating chamber by utilizing the residual heat of the molding die, and the preheated material is formed. As a result, the time required for the heat to reach the center of the material during molding is shortened, and molding can be performed in a short time, thereby improving productivity. In addition, since molding can be performed in a short time, it is also possible to shorten the time during which the heating section is in contact with the surface of the material, and to reduce the influence of heat on the surface of the material, thus enabling a clean molding. Further, an effect such as deep drawing can be expected.

[Brief description of the drawings]

FIG. 1 is a side view of a thermoforming device shown as one embodiment of the present invention.

FIG. 2 is a perspective view showing only a thermoforming die.

FIG. 3 is a perspective view of a molded ceiling formed by the thermoforming apparatus of the present embodiment.

FIG. 4 is a side view of a conventional thermoforming device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoforming apparatus 2 Thermoforming mold 2A Mold half 2B Mold half 4 Material 10 Preheating chamber

Claims (1)

(57) [Scope of request for utility model registration] 1. A thermoforming mold comprising a pair of heated mold halves, pressing and heating a material between the pair of mold halves to form the material into a predetermined shape. Thermoforming, characterized in that a preheating chamber for providing preheating to the material before molding by using residual heat of the heated mold half is provided in one of the mold halves. Type.