JPH09193235A - Removal of burr of blow molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the quality dispersion and easily exclude burr by softening the burr formed to the parting part of a blow molded product and continuously pressing a press member to the burr to allow the burr to disappear. SOLUTION: A headrest being a blow molded product 1 is set to a fixing jig 2 and burr 11 is formed to the parting part of the skin 1a thereof. Next, compressed air is supplied to a foamable raw material injection part 12 by a compressed air supply machine to expand the skin 1a and a press jig 4 is placed on the skin 1a. Next, hot air is sprayed on the burr 11 from the nozzle 51 of a hot jet device 5 and a press member 6 is pressed to the burr 11 becoming a softened state. At that time, the roller 61 provided to the leading end of the press member 6 is pressed to the burr 11 by energizing force. The hot ejecting device 5 and the press member 6 are attached to a self-running vehicle 8 to be operated and the self-running vehicle 8 is moved to crush the burr 11 softened by the hot jet device 5 by the press member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing burrs from blow-molded articles such as headrest skins.

[0002]

2. Description of the Related Art Blow-molded articles such as headrest skins made of vinyl chloride resin or the like have generally been processed by blow-molding the outer periphery by die cutting as shown in FIG. In FIG. 4, reference numeral C indicates a cavity of the blow mold 9.

[0003]

However, since the width L of the biting portion is about 0.3 mm, the length of the burr 11 formed by the biting portions 91 and 92 is 0.
It became 3 mm, and it was too conspicuous to make the blow-molded product as the product S as it was (FIG. 5), and the burr 11 had to be removed by a cutter or the like. In the past, since this removal work was performed manually, many man-hours were required and the cost was high. Further, since it is a work for removing burrs having a length of about 0.3 mm, too much cutting, uncutting, etc. are inevitably made, resulting in poor appearance and a problem in terms of quality.
In addition, when a resin molded product is shaved with a cutter or the like, the shaved part generally becomes whitish (whitening phenomenon), but even in the above-mentioned burr part 11, only the part removed by the cutter or the like has a whitish luster due to light adjustment. There was a tendency to be seen as a problem in terms of quality when released. Of course, the bite width L is 0.1 mm
Attempts have also been made to reduce the burrs 11 by narrowing them to some extent, but the adhesive strength of the molded skin 1a may be inferior, and the mold 9,
I was in a situation that was structurally impossible due to the exhaustion of 9.

The present invention solves the above problems, and an object of the present invention is to provide a method for removing burrs from blow-molded articles which eliminates quality variations and can easily remove burrs formed on blow-molded articles. .

[0005]

In order to achieve the above object,
The gist of the present invention according to claim 1 is characterized in that a burr formed on a parting portion of a blow molded product is softened, and then a pressing body is pressed against the burr to eliminate the burr. There is a method for removing burrs from the product. Further, the gist of the present invention according to claim 2 is that a predetermined amount of air is enclosed in a blow-molded product to inflate it, and then the blow-molded product is appropriately pressed to be formed in a parting part of the blow-molded product. A burr-removing method of a blow-molded article is characterized in that the burr is projected outwardly, then the burr is softened, and then a pressing body is pressed against the burr to eliminate the burr. The method for removing burrs from blow-molded products according to claim 3 is
3. The hot jet for blowing hot air to soften the burr portion and the pressing body for pressing against the softened burr, and the blow molded article according to claim 1 or 2, wherein the blow molded article is configured to be relatively movable, and the hot jet and the pressing body or blow. It is characterized in that burrs formed around the parting portion are eliminated as the molded article orbits. The blow molded article deburring method according to claim 4 is characterized in that the blow molded article according to claims 1 to 3 is a headrest skin.

When the burr is softened and then the pressing body is pressed against the burr as in the first aspect of the invention, the burr is crushed because it is soft and the burr easily disappears. Further, since the burr is not a technique of scraping off, the whitening phenomenon is not caused and the product becomes excellent in quality. When the blow-molded product is pressed after the blow-molded product is filled with a predetermined amount of air and inflated as in the invention described in claim 2, the burr portion is projected outward. It becomes easier to soften and press the pressing body, and the burr can be eliminated more neatly and easily. According to the third aspect of the present invention, the hot jet and the pressing body and the blow-molded product are configured to be movable relative to each other, and the hot jet and the pressing body or the blow-molded product circulates to form a party. Since the burr formed around the ring portion is eliminated, the working time can be further shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. 1 to 3 show an embodiment of a method for removing burrs from blow molded products according to the present invention. FIG. 1 is a perspective view of a blow molded product set on a fixing jig for removing burrs, and FIG. 2 shows that the blow molded product is filled with a predetermined amount of air from the state of FIG. FIG. 3 is a partially enlarged cross-sectional view, and FIG. 3 is a perspective view in which the hot jet and the pressing body are operated after the state of FIG. 2 is secured. It is applied to a perforated headrest as a blow molded product. The same reference numerals as those in FIGS. 4 and 5 denote the same or corresponding parts.

First, prior to a method for removing burrs from blow-molded products, an apparatus used therefor will be described. The burr removing device includes a fixing jig 2, a compressed air supply device 3, a holding jig 4, a hot jet 5, and a pressing body 6. Fixing jig 2
Is for fixing and holding the blow-molded product 1 and is in the form of a disc (FIG. 1). The fixing jig 2 is provided with a recess 21 matching the shape of the lower half of the blow-molded product 1 so that the burr 11 of the blow-molded product 1 appears above the upper surface of the fixing jig 2. The compressed air supply device 3 is a device for enclosing a predetermined amount of air A in the blow-molded product 1 from the foaming material injection port 12 made by blow molding. Here, the pressing jig 4 is formed of a disk body having a constant weight, and appropriately presses the blow-molded product 1 in which the air A is enclosed so that the burr 11 is projected outward. The holding jig 4 has such a size as to cover the perforated portion O and further to fill up almost the intermediate region between the outer circumference of the head rest and the inner diameter of the perforated portion O (FIG. 2). The hot jet 5 is a device that blows hot air that softens the burr 11, and the pressing body 6 is a device that crushes the softened burr 11 (FIG. 3).

In the method for removing burrs from blow-molded products, the blow-molded product 1 is first fixed to the fixing jig 2 by using the above apparatus.
Set to. The headrest skin 1a, which is the blow-molded product 1 of the present embodiment, has a bag shape, and the insert 7 has already been incorporated by blow molding. After that, the foaming raw material G is injected from the foaming raw material injection port 12 to form the foam integrated with the skin 1a and the insert 7, and the headrest skin 1a becomes a final product headrest. However, the parting portion P has burrs 11 on the skin 1a.
Since this is formed, the burr 11 is to be removed in advance. The burr 11 is arranged so as to be located above the board surface 22 when the blow-molded product 1 is set on the fixing jig 2.

Next, the nozzle 31 of the compressed air supplier 3 is inserted into the foaming material injection port 12 of the blow molded product 1. Then, a predetermined amount of air A is blown into the epidermis to inflate the epidermis 1a. This is to prevent the burr 11 from escaping into the epidermis when the pressing body 6 described later is pressed against the burr 11. Then, the foaming material inlet 12 is plugged (not shown), or the foaming material inlet 12 is sealed with a stopper (not shown) or the like.

Subsequently, the pressing jig 4 is placed on the bulged skin 1a. The skin 1a in a swelled state containing a predetermined amount of air A is crushed by the weight of the pressing jig 4 as shown in FIG. 2 while being repelled, and the burr 11 is pushed outward. In addition, in FIG. 2, in order to make the present invention easy to understand, a skin step m of the burr 11 and the parting part P is shown.
Is emphasized in the drawing.

After ensuring such a state, next, hot air is blown to the burr 11 using the hot jet 5.
The hot jet 5 is composed of a device capable of blowing heated air A from its tip nozzle 51 toward an object. For example, a heat gun (Ishizaki Electric Co., Ltd., trade name: Plajet, type: PJ- 214
What processed A) etc. is used. This hot jet 5 has a maximum capacity of about 65, unlike a simple dryer.
It is possible to blow hot air at 0 ° C., which is extremely effective for softening only the burr 11 under temperature control.

Then, the pressing body 6 is pressed against the burr 11 in the softened state. The pressing body 6 is provided with a roller 61 at its tip, and the roller 61 is designed to be pressed against the burr 11 with a constant urging force and to be rotationally movable. And, the hot jet 5 and the pressing body 6 are
Both are assembled to the self-propelled vehicle 8, the hot jet 5 and the pressing body 6 are operated, and the self-propelled vehicle 8 is moved, whereby the burrs 11 can be disappeared one after another. While the self-propelled vehicle 8 orbits the blow-molded product 1, the pressing body 6 crushes the burr 11 softened by the hot jet 5 without any delay. The self-propelled vehicle 8 runs on a rail (not shown) provided here so that the nozzle 51 keeps a constant distance from the burr 11 and the roller 61 can press the burr 11 with a predetermined pressure. Thus, in the parting part P through which the pressing body 6 has passed, the burr 11 disappears cleanly. In this embodiment, the hot jet 5 and the pressing body 6 are moved while the blow-molded product 1 is left stationary.
A mechanism (not shown) for moving the blow-molded product 1 with respect to the pressing body 6 may be used.

Since the method for removing burrs of the blow-molded article 1 thus constructed is not a method of scraping off the burrs 11 as in the conventional case, there is no problem of overcutting or uncutting. In addition, the whitened portion due to scraping was a problem in terms of quality, but in the present invention, after the burr 11 is softened by the hot jet 5, the burr 11 is eliminated by pressing the pressing body 6 against that portion. Because it takes
Quality problems are resolved. The part where the burr disappeared is the epidermis 1
It becomes exactly the same as the place of a, and the quality trouble that has been a problem for many years will disappear. Of course, the method of softening the burr 11 and subsequently pressing the pressing body 6 to the portion to eliminate the burr 11 does not become nervous compared to the work of cutting with a cutter or the like, and the work load thereof is reduced. It Further, after a predetermined amount of air A is enclosed in the blow-molded product 1, the pressing jig 4 is placed on the blow-molded product 1, so that the burr 11 formed on the parting part P is projected outward. Therefore, the burr 11 can be softened and the pressing body 6 can be pressed more easily against the softened burr 11. Further, as in the present embodiment, the hot jet 5 and the pressing body 6
When the blow-molded article 1 is placed on the self-propelled vehicle 8 so that the blow-molded article 1 can be circulated, the procedure in which the roller 61 immediately presses the burr 11 softened by the hot jet 5 is surely performed, so that the outer peripheral surface of the skin can be formed. The burr 11 can be removed faster and cleaner.

The present invention is not limited to those shown in the above embodiments, but can be variously modified within the scope of the present invention depending on the purpose and application. The shapes and sizes of the blow molded product 1, the fixing jig 2, the compressed air supplier 3, the pressing jig 4, the hot jet 5, and the pressing body 6 are appropriately selected according to the application. As a method of moving the hot jet 5 and the pressing body 6 relative to the blow-molded product 1, for example, the fixing jig 2 may be placed on an NC board and the blow-molded product side may be moved. How to move is
It can also be moved by a robot or the like. Of course, it is not necessary to completely remove the burr 11 with the hot jet 5 and the pressing body 6,
The crowded areas may be manually processed. Not only the headrest skin 1a but also various blow-molded products 1 can be applied.

[0016]

INDUSTRIAL APPLICABILITY As described above, the method for removing burrs of blow-molded products according to the present invention can cleanly and quickly remove burrs without the whitening phenomenon resulting from the cutting of burrs. It has an excellent effect on quality improvement and productivity improvement.

[Brief description of the drawings]

FIG. 1 is a perspective view of a blow-molded product set on a fixing jig for removing burrs in an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view in which a predetermined amount of air is enclosed in the blow-molded product from the state of FIG. 1 and then the blow-molded product is pressed by a holding jig.

FIG. 3 is a perspective view in which the hot jet and the pressing body are operated after the state of FIG. 2 is secured.

FIG. 4 is an explanatory cross-sectional view of a conventional technique.

FIG. 5 is an explanatory perspective view of a conventional technique.

[Explanation of symbols]

 1 Blow-molded product 1a Skin 11 Burr 5 Hot jet 6 Pressing body A Air P Parting part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location B29L 31:58 (72) Inventor Houji Kawase 3-36 Imaikecho, Anjo City, Aichi Stock Company Inoac Corporation Anjo Office

Claims (4)

[Claims] 1. A method for removing burrs from a blow-molded product, which comprises softening the burrs formed on a parting part of the blow-molded product, and subsequently pressing a pressing body against the burrs to eliminate the burrs. 2. A blow molding product is filled with a predetermined amount of air and inflated, and then the blow molding product is appropriately pressed so that a burr formed on a parting portion of the blow molding product is projected outward. Next, a method for removing burrs from blow-molded articles, which comprises softening the burrs and subsequently pressing a pressing body against the burrs to eliminate the burrs. 3. A hot jet which blows hot air to soften the burr portion and a pressing body which presses against the softened burr,
Configure the blow molded product to be relatively movable,
The method for removing burrs from a blow-molded product according to claim 1 or 2, wherein burrs formed around the parting portion are eliminated by orbiting the hot jet and the pressing body or the blow-molded product. 4. The method for removing burrs from a blow-molded article according to claim 1, wherein the blow-molded article is a headrest skin.