JPS5949920A - Flash removal of molded piece - Google Patents

Abstract

PURPOSE:To remove the flashes of a thermoplastic resin molded piece in a short time, simply and in a good appearance by a method wherein a heat plate having a contact surface that fits to the flash of the molded piece is pressed firmly against the flash to melt the flashes. CONSTITUTION:The thermoplastic resin molded piece 1, for example, is laid in the groove area 5 of a support mold 6 so that flashes 4 can be found out, then, a heating plate 9a-9d having a contact surface 12 fitting to the part of the molded piece 1 with flashes is moved outwardly along the molded piece, and the contact surface 12 is pressed against the flashes 4 of the molded piece 1 to melt and remove the flashes 4 of the molded piece 1. Moreover, in a molded piece poor in occurrence of flashes, the flashes can be removed efficiently in a short time of handwork and this processing is preferable to be applied to hollow molded pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION Regarding the removal method, in particular, it relates to a method of melting and removing pars by pressing a hot plate against the pars occurrence area D[ of the molded article.

A notable example of a molded product that causes high IJ is a blow-molded hollow molded product, such as the outer skin of an armrest. Place the parison at the four molding positions of the mold, and at the same time close the half-split mold, blow compressed air into the parison in the mold from a nozzle to expand the parison and bring it into close contact with the inner surface of the molding recess of the mold. Since this is the process of taking out the molded body after cooling the mold, unnecessary material from the parison adheres to the molded body where it is held between the molds, so this adhesion is unnecessary. It became necessary to tear the material and remove it, and small gouges were generated in this area, resulting in an unsightly appearance.

For this reason, the conventional method for removing the edges of this yuzu tree has been to manually remove them using a cutter, but in this case, there are variations in quality due to excessive cutting, especially when the edges are small. was extremely difficult.

Moreover, if there were a large number of Paris generator cylinders B, manual removal was extremely time consuming.

The purpose of the present invention is to improve these conventional problems and provide a method for removing pars that can remove pars in a short time and produce a molded product with a good appearance.The present invention is characterized by: A molded body having a burr is placed in a support mold, and a heating plate having an abutment area that matches the shape of the burr is pressed against the burr to melt and remove the burr.

Hereinafter, the method of the present invention will be specifically explained using the outer skin of an automobile armrest as an example, with reference to the accompanying drawings.

Figure 1 shows a hollow molded body (1) obtained by blow molding using a thermoplastic resin such as soft vinyl chloride. The two armrest outer skins (2) have a connected hollow body shape that is positioned symmetrically via a connecting portion (3). The molded body m taken out from the mold usually has un-absorbed material from the molding raw material attached to the parts held by the mold, and when these unnecessary materials are torn and removed, the hollow molded body (1
) A protruding paris (4) occurs over a portion of each outer corner of the surface and the entire inner surface.

Therefore, in the next step, the hollow molded body (1) is deburred, but in the present invention, the hollow molded body is held as shown in FIGS. 2 and 3. groove (
5) and a ring-shaped support type (6
) Heating plates (9 to +9
b) (9c) (9d) and supporting mold (6);
Deburring is performed by a finishing machine equipped with an inner heating plate (11 lb) that moves vertically and horizontally within the central opening 1Ill of the mold.

That is, the hollow molded body (1) with trench O'+1 is placed in a support type (6
) After installation in the 1717 part (5) of the molded body, the heating plate has a shape that allows it to come into close contact with the flash generation area of the molded body, and has a contact surface (+2) that hangs in contact only with the flash area. (9aJ (9 clauses (g c)) (9d) is moved protrudingly and the corresponding contact surface (12) is pressed against the edge (4) of the molded body,
At the same time, the inner heating plate (11-(1l b)) having a contact surface (121') that can come into contact with the inner surface (4) of the molded body is moved, and the corresponding contact surface j+4' is moved. After pressing the inside bar (4) of the molded body and holding these pressures for the required time to melt the bar (4), each heating plate (9a
) (9b) (9c) +9d) (llaJ (l
lb) to its original position and molded body (1) supporting mold (
6) Take it out.

Here, the temperature and pressing time of each heating plate vary depending on the age of the molded product and the environmental temperature, but for molded products made of vinyl chloride or polypropylene resin, the temperature of the heating plate is usually set at 2°C. The optimum conditions are ℃ to 220℃ and a suppression time of 2 to 5 seconds.Also, for molded products made of other thermoplastic resins, the heating plate temperature and suppression time should be selected appropriately. Similarly, -C can be removed by heating and melting Paris.

1. Although the molded body used in the present invention is not limited to the known molded body, the method of the present invention can produce a molded body with a small occurrence of paris, particularly in an extremely short time and efficiently compared to manual labor. Hollow molded bodies obtained by blow molding are suitable because they can be used to remove dust and generally have small dust.

As explained above, the present invention is a method of melting and removing the paris by pressing a heating plate against the paris-generated part of the compact for a certain period of time.V, simply setting the compact and pressing the heating plate It is possible to remove pars with a good appearance in a short time, and has the effect of improving the appearance and practical value of the molded product, especially when removing small cut-off pars from a hollow molded product obtained by blow molding (r: 1 is the most effective, and combined with the simplicity of its equipment, it is suitable for industrial production and is expected to be extremely effective.

[Brief explanation of the drawing]

The first factor is "a perspective view showing an example of a continuous hollow molded body obtained by blow molding, FIG. 2 is a plan view showing an embodiment of the deburring method of the present invention, and FIG. It is a cross-sectional view. il+...Molded object.(4)...B IJ.
...Support type. (9a) ~ (9d) , (lla) (llb)
,--heating plate. Patent applicant Mitsuboshi Belting Co., Ltd. Agent Patent attorney Yasushi Miyamoto

Claims (1)

[Claims] / B11? i: T thermoplastic resin molded bodies are placed in the Paris 2
The paris of a molded article is characterized in that N is exposed and supported by a support mold, and the paris is melted and removed by pressing a heating plate having a contact surface that matches the shape of the molded article in the paris portion against the paris portion. Removal method. A thermoplastic resin molded body with a diameter of 10 mm is molded by blow molding, and the inner and outer surfaces are coated with a thermoplastic resin molded body. The hollow molded body is placed in a ring-shaped support mold, and a heating plate having a contact surface that matches the shape of the molded body of the crisp portion is pressed from the outside and inside of the hollow molded body against the crisp portion. The method for removing pars from a molded article according to claim 1, characterized in that P is melted and removed when the contact t<IJ.