JPS612516A - Heating apparatus of mold for molding resin - Google Patents

Abstract

PURPOSE:To mold efficiently a resin skin material, by providing a lifting apparatus with a cover body for closing an upper opening of a mold and a chuck mechanism for holding detachably the mold. CONSTITUTION:A mold 7 heated in a heating furnace 6 is held by a lifting apparatus 8, and is moved along the position of a turning apparatus 9, arms 10, 10 are turned with the mold 7 clamped, the opening of the mold 7 and the upper opening of a powder resin filled layer 11 are abutted, and they are rotated integrally to transfer the powder resin in the layer 11 into the mold 7. The powder resin adhered to the molding surface in the mold 7 is melted to form a melted resin layer on the molding surface. Thereafter, a cooling tank 12 contained in the mold 7 is moved along rails 5 to transport the mold 7 to either of foaming and molding sections 3, the upper opening section is covered with a foaming mold, and a foamable resin raw material is loaded from an injection apparatus 14 into the space defined between the molding surface and the foaming mold, so that a heat covered with a resin skin material for vehicles can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heating device for a mold for molding a resin skin material.

(Prior art) Injection molding and blow molding are generally used as means for molding the skin material of vehicle seats, but these methods require time and cost to manufacture molds, and molds with complex shapes are required. The product is difficult to obtain.

Another method is slush formation or rotation in which a sol-like resin is attached to the molding surface of a mold, the mold is heated to form a molten resin layer, and this molten resin layer is cooled to become a skin material. Molding is also a possibility. However, the heating means used in these methods include methods using high-temperature liquid or steam, embedding a heater in the mold, and induction heating methods using high frequency or microwave waves, but these methods tend to complicate the structure of the mold. It also has the disadvantage of not being able to heat uniformly.

Therefore, as a means of heating the mold, the present applicant proposed in Japanese Patent Application No. 58-247554 a method of immersing the mold in a fluidized bed in which alumina particles or the like are heated in a fluidized state.

(Problems to be Solved by the Invention) When heating a mold using the fluidized bed described above, there are various problems that must be solved. First of all, since the alumina particles constituting the fluidized bed are easily scattered, there is a risk that they may adhere to the molding surface of the mold. Secondly, in order to efficiently mold resin skin materials, it is necessary to be able to automatically transport the mold from heating the mold to molding the resin, that is, from the heating position to the powder resin supply position. Thirdly, it is necessary to be able to automatically immerse and take out the mold into the fluidized bed.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a frame above a heating furnace that holds a heated fluidized bed, a lifting device is attached to this frame, and a lifting device is attached to the lifting device. A cover body that closes the upper end opening of the mold and a chuck mechanism that detachably holds the mold are provided.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is an overall plan view of a vehicle seat manufacturing apparatus to which a mold heating device according to the present invention is applied, and this manufacturing apparatus includes a heating section (1), a powder resin supply section (2), and a foam molding section. (
The main parts are composed of 3), and these parts are connected by a frame (4), rails (5), etc.

To explain the outline of the manufacturing order, first, the mold (7) is heated in the heating furnace (8), and then the heated mold (7) is heated.
) is held by a lifting device (8), and this lifting device (8) is conveyed along the frame (0) to the position of the reversing device (9), and the arm (10) of this reversing device.

Clamp the mold (7) at (10), turn the arms (10) and (10) over while clamping the mold (7), and connect the opening of the mold (7) with the powder resin filling layer (11). ), and in this state, rotate the mold (7) and the powder resin filling layer (11) together to form the powder resin filling layer (11).
) is transferred into the mold (7), the powder resin is adhered to the inner molding surface of the mold (7), the adhered powder resin is melted by the heat of the mold (7), and the mold is molded. A molten resin layer is formed on the molding surface of the mold.

After this, the mold (7) is clamped again with the arms (to) and (10), the arms (10) and (10) are reversed to their original state, and the cooling tank is placed on the rail (5). (1
2) Transfer the mold (7) into the container. And mold (7)
The cooling tank (12) containing the mold (12) is moved along the rail (5) and the mold (
7) Transport. After this, in the foam molding section (3),
The upper end opening of the mold (7) is covered with the foaming mold taken out from the mold changing device (13), and the space formed between the molding surface and the foaming mold is covered with the foam resin injection device (14). Fill with foamed resin raw material.

Thus, a vehicle seat in which the surface of the foamed resin is covered with a resin skin material is obtained.

FIG. 2 is a front view of the heating device according to the present invention, in which a holding plate (15) for placing the flange part of the mold (7) is provided in the upper opening of the heating furnace (8), and (6) The interior is divided into an upper chamber (Sl) and a lower chamber (S2) by a horizontal filter (16), and the upper chamber (Sl) is filled with alumina particles (17)... A heater (18) is arranged, and a compressed air supply pipe (
18) and connect the lower chamber (
The air introduced into S2) is supplied into the upper chamber (Sl) through the filter (1 day), and the alumina particles (17) in the upper chamber (Sl) are brought into a fluid state. Since the alumina particles (17) are heated by the heater (18), a heated fluidized bed is formed in the upper chamber (Sl).

Further, above the heating furnace (8), the frame (4) supported by a support (20) is located, and this frame (4)
The main body (21) of the lifting device attached to the
22), the main body (21) is equipped with a gear box (23), and this gear box (23) includes rods (24) forming a rack, (24) and is rotated by a motor (25) capable of forward and reverse rotation, the gear in the gear box (23) is engaged with the rack of the rod (24), and the rod (24) is driven by the motor (25). ) moves up and down.

Further, a support (26) is fixed to the lower end of the rod (24), and a plurality of pairs of cylinders (27) and (28) are arranged on the lower surface of the support (2B) as shown in FIG. Attachment: A cover body (29) that closes the upper end opening of the mold (7) is penetrated and fixed to these cylinder bodies (2?) and (28).

By the way, a shaft (30) is rotatably inserted into one of the cylinders (27) and (2B),
A gear (31) is fitted to the upper end of this shaft (30), and this gear (31) is connected to the motor (3) disposed within the support (26).
2) A gear (see Fig. 4) rotated by
33). Further, an arm (34) is fixed to the lower end of the shaft (30). Thus, when the motor (32) is rotated by a predetermined amount, the arm (34) is rotated by a predetermined angle.

Also, a mold (7) located opposite the other cylindrical body (28)
A protrusion (38) is provided on the flange portion (35) of the cylindrical body (
The inner diameter of the lower part of 28) is made large enough to fit this projection (38), and a notch (38a) is formed in the projection (36), and the projection (36) is fitted into the cylindrical body (28). A window (28a) is formed at a position that coincides with the notch (3ea).

Further, an elastic member (37) for sealing is provided on the lower end side of the inner surface of the cover body (29) and on the upper surface of the flange portion (35).

(3g) is provided.

The operation of the heating device as described above will be described below. First, at the standby position of the mold (7), the mold (
7) Retain. As for the holding action, from the state shown in Fig. 3, the motor (25) is driven to lower the rod (15), support (26) and cover body (28) into one body, and the cover body (28) is used to hold the metal. The upper end opening of the mold (7) is closed, and the protrusion m (36) of the mold (7) and the cylindrical body (28) of the lifting device (8) are engaged. This state is shown in FIG. Next, drive the motor (32) to move the arm (34).
and rotate the arm (34) to the window (28) of the cylinder (28).
28a) and the notch (36a) of the protrusion (36), and the mold (7) is held by the lifting device.

Then, the motor (25) is driven to raise the rod (24), and with the mold (7) positioned upward, the motor (
22) to move the lifting device (8) by the frame (4) to above the heating furnace (8).

Next, drive the motor (25) again to move the rod (24)
, the support (28) and the mold (7) are lowered as one body, and the mold (7) is immersed in the fluidized bed of the heating furnace (6). In this case, the mold (7) shall be immersed until the lower surface of the flange contacts the holding plate (15) of the heating furnace (6).

In this state, the mold (7) is immersed in the fluidized bed for a predetermined time to heat the mold (7). Here, since the upper end opening of the mold (7) is covered with a cover body (29), even if the alumina particles (17) constituting the fluidized bed are scattered, the mold (7) There is no intrusion inside.

Therefore, there is no disadvantage such as molding a skin material containing alumina particles (17).

Thereafter, the motor (25) is driven to raise the support (26) while holding the mold (7), and in this state, the lifting device (8) is driven by the motor (22) to raise the turning device. (
Move the lifting device (8) to position 8).
Release the holding state of the mold (7) by the arm (10)
, (10), and the subsequent steps are as described above.

(Effects of the Invention) As explained above, according to the present invention, the mold for resin molding is heated by immersing it in a fluidized bed made of alumina particles, etc., so it is faster than conventional induction heating. In addition, the mold can be heated uniformly without complicating the mold itself, and since the mold is covered with a cover, even if the alumina particles forming the fluidized bed are scattered, the inner surface of the mold will not be affected. By providing the above-mentioned cover body and mold chucking device to the lifting device that can run relative to the frame without adhering to the molding surface of the mold, heating of the mold and removal of the mold from the heating furnace are possible. The removal and further conveyance can be performed automatically, and it exhibits many effects such as being able to efficiently manufacture resin skin materials and the like.

[Brief explanation of the drawing]

FIG. 1 is an overall plan view of a vehicle seat manufacturing apparatus to which a mold heating device according to the present invention is applied, FIG. 2 is a front view of the mold heating device, and FIG. 3 is a top view of a mold heating device for a lifting device. FIG. 4 is a partially cutaway front view showing details, and a plan sectional view showing a state in which the cylindrical body of the lifting device and the protrusion of the mold are fitted. In the drawings, (1) is a heating section, (2) is a powder resin supply section, (3) is a foam molding section, (4) is a frame, (6) is a heating furnace, (7) is a mold, ( 8) is a lifting device, (17) is an alumina particle, (23) is a gear box, (24) is a rod, (2B) is a support body, (27) and (28) are a cylinder body, (
29) is a cover body, (34) is an arm, and (36) is a projection.

Claims (1)

[Claims] A heating furnace that holds a heated fluidized bed for immersing a mold for resin molding, a frame disposed above this heating furnace, a lifting device attached to this frame, and an upper end opening of the mold. A mold for resin molding, comprising: a cover body attached to the lower end of the lifting device to block the lifting device; and a chuck device installed on the lifting device to allow the mold to be attached to and removed from the lifting device. heating device.