JPH04301416A - Slash molding equipment - Google Patents

Abstract

PURPOSE:To provide a slash molding equipment capable of smoothly mold- releasing a skin layer formed on the molding surface of a molding die on slash molding. CONSTITUTION:The outer circumferential section of a skin layer 9 formed onto the molding surface 1b of a molding die 1 is pushed by the pushing member 11 of a leakage preventive instrument 10, and compressed air is fed between the skin layer 9 and the molding surface 1b through a nozzle 2 and a ventilating hole 3 mounted to the molding die 1, thus smoothly peeling the skin layer 9 from the molding die 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slush molding device that can smoothly demold a molded skin layer.

0002

[Prior Art] In slush molding, a mold is heated to a predetermined temperature and then a powder or sol molding material made of plastic such as vinyl chloride mixed with a plasticizer, stabilizer, etc. is placed inside the mold. The heat from the mold melts the molding material to form a skin layer of a predetermined thickness, and the excess material is discharged from the mold.The mold is then cooled by various methods to form a molten skin. A method is used in which the layer is cooled and solidified, and then manually removed from the mold.

0003

[Problems to be Solved by the Invention] As mentioned above, in the past, the skin layer was manually removed from the mold, resulting in poor molding efficiency. In addition, attempts have been made to automatically demold using robots, etc.
Since the mold and the skin layer are in close contact with each other, the peel strength during demolding is high. Therefore, if they are forcibly peeled off, the dimensions of the skin will not be constant in the case of a soft slush skin. The problem to be solved by the present invention is that the skin layer formed on the mold during slush molding cannot be smoothly removed from the mold as described above.

0004

[Means for Solving the Problems] The present invention provides a mold having a ventilation hole provided with a nozzle on the back surface between the mold surface and the back surface, and a mechanism connected to the nozzle for supplying compressed air. and a pipe provided opposite to the mold surface of the mold,
It consists of a compressed air leak prevention device that can press the outer periphery of the mold surface through the molded skin layer, and the skin layer is formed on the mold surface by slush molding, and after solidification, the outer periphery of the mold surface is covered with the above skin layer. The mold surface was pressed with a leak prevention device, and compressed air was sent from a nozzle between the mold surface and the skin layer to separate the skin layer from the mold surface.

[0005]

[Example] Fig. 1 shows a slush molding apparatus according to the present invention, and (A) is a connection diagram between a mold and a compressed air supply mechanism;
(B) is a YY sectional view of the mold, FIG. 2 is an enlarged perspective view of the mold, and FIG. 3 is an enlarged sectional view of the nozzle attachment portion of the mold. In the figure, 1 is a mold for an automobile instrument pad, and the back surface 1 is disposed between the mold surface 1b and the back surface 1a.
Three ventilation holes 3 each having a nozzle 2 are provided on the side a. Further, 9 is a skin layer formed on the mold surface 1b by slush molding and solidified. The diameter of the above vent hole is 12φ.
mm, and a sealing rod 2a biased by a spring 2b is attached inside the nozzle 2, thereby preventing clogging of the nozzle 2 by molding powder during molding. 14
is an ejector attached to the hole 1c at the corner of the mold 1 (only one ejector is shown in FIG. 1(B) and omitted in FIG. 2). Reference numeral 10 denotes a compressed air leak prevention device provided facing the mold surface 1b and capable of pressing the outer periphery of the mold surface 1b through the skin layer 9, and a frame-shaped pressing member 11 having a cushioning material 11a attached to the upper surface. and an air cylinder 13. Note that the mounting position, quantity, shape, etc. of the vent hole 3 having the nozzle 2 in the mold must be determined depending on the product shape. Furthermore, each nozzle 2 has a compressor 4.
, a pressure reducer 5, an on-off valve 6 such as a solenoid valve, and a pipe 8 for supplying compressed air having a rotary joint 7 are connected.

Next, the operation of the slush molding apparatus having the above structure will be explained based on FIG. 4. After forming the skin layer 9 on the mold surface 1b of the mold 1 by ordinary slush molding,
), the mold 1 is cooled to 40 to 45° C. by jetting water and air from the cooling nozzle 12. Then (D
), the pressing member 11 of the compressed air leak prevention device 10 is connected to the air cylinder 1 via the cushioning material 11a
3, compressed air is pressed against the outer periphery of the skin layer 9, and the pressure is controlled to 1.5 to 2.0 kg/cm2 by the pressure reducer 5. The on-off valve 6 is opened and compressed air is sent from the air nozzle 2 of the mold 1 through the vent hole 3. Most of the skin layer 9 is covered with the mold 1 by spreading it sufficiently between the mold surface 1b and the skin layer 9.
completely peel it off. In this case, if complete peeling of the outer peripheral portion is difficult, after the pressing member 11 is released from the mold 1 as shown in (E), the end of the skin layer 9 is peeled off by the ejector 14. Then, the arm grip 15 of the robot is inserted into this part, the end of the skin layer 9 is gripped, and the skin layer 9 is completely removed from the mold by the designated movement of the robot.

[0007]

As explained above, according to the present invention, the skin layer formed on the mold surface of the mold in slush molding can be easily peeled off from the mold surface, improving molding efficiency, and improving the size of the skin layer. This also makes it possible to make the mold removal work even more automated.

[Brief explanation of the drawing]

[Figure 1] In the slush molding device, (A) is a connection diagram of the mold and compressed air supply mechanism, (B) is the Y-Y of the mold
FIG.

FIG. 2 is an enlarged perspective view of the mold.

FIG. 3 is an enlarged sectional view of the nozzle attachment portion of the mold.

FIG. 4 is an explanatory diagram of removing the skin layer during slush molding.

[Explanation of symbols]

1...Molding mold
1a... Back side 1b... Mold side
1c...hole 2...nozzle
2a... Seal rod 2b... Spring
3... Ventilation hole 4... Pressing machine
5...Pressure reducer 6...Opening/closing valve
7...Rotary joint 8...Piping
9... Epidermal layer 10... Leak prevention device
11...Press member 11a
...Cushion material 12
…Cooling nozzle 13…Air cylinder
14...Ejector 15...Arm grip

Claims (4)

[Claims] 1. A mold having a ventilation hole provided with a nozzle on the back surface between the mold surface and the back surface, a pipe connected to the nozzle and equipped with a mechanism for supplying compressed air, and the mold A slush molding device comprising a compressed air leak prevention device that is provided opposite to a mold surface of a mold and can press the outer periphery of the mold surface through a molded skin layer. 2. The slush molding apparatus according to claim 1, wherein the mechanism for supplying compressed air includes a compressor, a pressure reducer, an on-off valve, and a rotary joint. 3. Claim 1 or 2, characterized in that it is a leak prevention device comprising a pressing member and an air cylinder.
The slush molding device described. 4. The slush molding apparatus according to claim 1, wherein the mold is provided with an ejector on the outer periphery for peeling off the molded skin layer.