JP2003340838A - Deburring method for resin molded product and deburring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently remove fine burr of a small-sized resin molded product. <P>SOLUTION: A high temperature iron 3 heated to a temperature not reaching the molten temperature of the resin of the resin molded product 1 is allowed to approach the burr remaining on the resin molded product 1 so as not to come into contact with the burr 2 to soften the burr 2. Subsequently, a medium temperature iron 5 heated to a temperature lower than that of the high temperature iron 3 and not bonding the burr to the iron even if the iron is pressed to the burr is pressed to the softened burr 2 to crush the burr 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burr removing method and a burr removing device for a resin molded product.

[0002]

2. Description of the Related Art When molding a resin molded product using a mold,
When burrs are generated along the parting line (mold dividing line), the appearance is impaired and the performance is lowered depending on the product.
Therefore, for example, the structure of the molding die may be improved to suppress the occurrence of burrs, or the die may be designed so that the burrs appear at positions where the burrs do not affect the performance of the product. . Occurrence of burrs may be suppressed by adjusting molding conditions such as molding temperature.

There has also been proposed a method of removing a burr by subjecting a resin molded product, which has a burr remaining during molding, to some treatment. For example, Japanese Patent Application Laid-Open No. 9-193235 discloses a method of removing burrs from a blow-molded product by blowing hot air to soften the burrs and then pressing a roller against the burrs.

[0004]

If it is attempted to suppress the occurrence of burrs by improving the mold, high precision is required in mold processing, alignment, etc., and the manufacturing cost and processing cost of the mold become high. There was a problem. Further, if it is attempted to suppress the occurrence of burrs by changing the molding conditions such as the molding temperature, the molding conditions are very limited, and other problems such as a decrease in transferability may occur. The degree of freedom of the mold design and the molding conditions is increased if the resin molding having the burr remaining during the molding is subjected to the post-treatment to remove the burr, but the method proposed so far in JP-A-9-193235 and the like. Then, it was not possible to remove burr efficiently at high speed.

In particular, in the conventional burr removal method, it is not possible to sufficiently remove the minute burr that is hardly visible to the naked eye, the molded part is downsized, and the allowable burr size is reduced. In this case, the problem of burrs could not be solved sufficiently. As a method for removing such minute burrs, there is a method in which an adhesive tape is attached to a portion having burrs and the adhesive tape is peeled off together with the burrs. There wasn't.

The present invention has been made in view of the above problems, and provides a burr removing method and a burr removing device for a resin molded product capable of efficiently removing minute burrs of a small resin molded product. The purpose is to do.

[0007]

A method for removing burrs from a resin molded product according to claim 1 of the present invention which solves the above-mentioned problems is such that the burr remaining on the resin molded product has a melting temperature of the resin. The high temperature iron heated to a temperature that does not reach is brought close to the iron so that it does not contact the burr, and the burr is softened, then
It is characterized in that the softened burr is crushed by pressing a medium-temperature trowel heated to a temperature lower than the temperature of the high-temperature trowel and at a temperature at which the burr does not adhere to the trowel even if the burr is pressed against the burr.

In the method for removing burrs from a resin molded product according to the second aspect of the present invention, the resin molded product for removing burrs is a simultaneous molding hoop in which a large number of small parts are integrated with a metal hoop.

Further, a deburring device for a resin molded product according to a third aspect of the present invention includes a fixture for supporting the resin molded product, a high temperature iron heated to a temperature not reaching the melting temperature of the resin, Position the medium temperature iron and the high temperature iron and medium temperature iron with respect to the resin molded product at a temperature lower than the temperature of the high temperature iron and heated to a temperature at which the burr does not adhere to the iron even when the iron is pressed against the burr. Equipped with a trowel moving mechanism that moves the relative position of the resin molded product and the high temperature iron and the medium temperature iron by the iron moving mechanism to bring the high temperature iron close to the burr remaining on the resin molded product so as not to come into contact with the burr. Is softened, and then the medium temperature iron is pressed against the softened burr to crush the burr.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A deburring method will be described with reference to FIGS. 1 to 4 showing the operating state of the deburring apparatus of the present invention. Here, the metal hoop 1a has a height of 3.4 mm and a width of 3.
A small burr 2 (for example, a height of about 0.1 mm and a thickness of about 0.1 mm) that remains in the resin molded product 1 which is a simultaneous molding hoop in which a small resin member 1b having a thickness of 5 mm and a thickness of 1.4 mm is integrated. 0
The case of removing (05 mm) will be described as an example. Figure 1
4 shows only one small resin member 1b, a large number of small resin members 1b are provided at regular intervals on the metal hoop 1a. The resin molded product 1 (simultaneous molding hoop) is supported by a predetermined fixture (not shown) of the deburring device, and is used for steps such as deburring according to the present invention and insertion of various parts into the small resin member 1b. After that, the metal hoop 1a is cut to complete, for example, a small switch.

The deburring device includes a small resin member 1b.
The high temperature iron 3 heated to a relatively high temperature, which does not reach the melting temperature of the resin constituting the (3), is provided (FIG. 1). Then, the high temperature iron 3 is moved to the burr 2 side by the iron moving mechanism (not shown), and the distance between the high temperature iron 3 and the original tip of the burr 2 before the burr treatment is about 0.05 mm (see FIG. 2).
The high temperature iron 3 is brought close to the burr 2 until (b)), and the burr 2 is softened by holding it as it is for a while (FIGS. 2 (b) and (c), where (c) is a side view of (b)). It is.) At this time, it is important to position the high temperature iron 3 so that the high temperature iron 3 does not contact the burr 2. When the high temperature iron 3 hits the tip of the burr 2, the melted burr adheres to the iron and the remaining burr on the iron is the metal hoop 1a.
Or other small resin member 1b and falls on the small resin member 1b to cover the contact portion of the switch, resulting in a defective product or the need for iron maintenance (cleaning or the like).

Therefore, it is necessary to position the high temperature iron 3 at an appropriate position with respect to the resin molded product 1. For example,
The pilot hole 4 is provided in the metal hoop 1a of the simultaneous molding hoop, and the space X between the pilot hole 4 and the high temperature iron 3 is set.
By controlling (Fig. 2 (b)) and controlling the interval Y (same) between the upper surface of the small resin member 1b and the high temperature iron 3, an appropriate gap remains between the high temperature iron 3 and the tip of the burr 2. Thus, the high temperature iron 3 may be moved.

After the burr 2 is softened by the high temperature iron 3, the simultaneous molding hoop is moved or the iron is moved to bring the medium temperature iron 4 and the resin molded product 1 close to each other (see FIGS. 3A and 3B). (B) is a side view of (a). The medium temperature iron 4 is gradually pressed against the softened burr 2 (FIGS. 4 (a) and 4 (b), where (b) is a side view of FIG. 4 (a)), and the burr 2 has a height within the standard (small resin member). 1b
The burrs 2 are crushed from the upper surface of (2) until they fit within a predetermined value of 0.005 to 0.05 mm).

Here again, it is necessary to position the trowel at an appropriate position with respect to the resin molded product, and the interval between the pilot hole 4 provided in the metal hoop 1a of the simultaneous molding hoop and the medium temperature iron 5 is controlled and a small resin member is provided. It is desirable to control the distance between the upper surface of 1b and the medium temperature iron 5. The temperature of the medium temperature iron is lower than the temperature of the high temperature iron, and the temperature at which the burr does not adhere to the iron even when the iron is pressed against the burr, that is, the burr softened in the previous step is plastically deformed but not melted. It is about the temperature.

It is possible to press the medium temperature iron 4 until it hits the upper surface of the small resin member 1b to make the height of the burr zero (FIG. 5), but there is a possibility that the iron may scratch the small resin member 1b. Therefore, as shown in FIG. 4, it is desirable to leave a gap between the upper surface of the small resin member 1b and the medium temperature iron 4.

The case where the resin molded product is the simultaneous molding hoop in which the small resin member is integrated with the metal hoop has been described above, but the resin molded product may be entirely made of resin. The type of resin constituting the resin molded product is not particularly limited. For example, liquid crystal polymer (LCP) or the like can be used.

The temperature of the high temperature iron and the temperature of the medium temperature iron are appropriately determined depending on the type of material, the size of the burr to be removed, and the like. The temperature of the high temperature iron is lower than the melting temperature but relatively high, which is preferable in that the burr can be quickly softened. In order to save energy, it is preferable that the medium temperature iron has a low temperature of about room temperature, but it is possible to determine the temperature of the medium temperature iron in consideration of the fact that if the temperature is too low, the crushed burr will return. preferable. As an example of the temperature of the high temperature iron and the temperature of the medium temperature iron, when the resin forming the resin molded product is a liquid crystal polymer having a melting temperature of 300 ° C., the high temperature iron is 220 to 270.
C., medium temperature iron is 40 to 120.degree.

[0018]

According to the method for removing burrs of the first aspect of the present invention, the trowel turns the high temperature iron heated to a temperature which does not reach the melting temperature of the resin with respect to the burrs remaining in the resin molded product. Soften the burr so that it does not come into contact with it, and then heat the softened burr to a temperature that is lower than the temperature of the high-temperature trowel and that does not adhere to the trowel when the trowel is pressed against the burr. Since the burrs are crushed by pressing the iron, the burrs can be locally heated and crushed, and even minute burrs of a small resin molded product can be efficiently removed. Also, since the high temperature iron heated to a high temperature does not come into contact with the burr, the melted burr adheres to the iron and the remaining burr on the iron falls onto the resin molded product (for example, the switch contact). Defective products will not be generated, and frequent iron maintenance (cleaning, etc.) will not occur.

In the method for removing burrs from a resin molded product according to the second aspect of the present invention, the resin molded product for removing burrs is a simultaneous molding hoop in which a large number of small parts are integrated with a metal hoop. Claim 1 for removing burrs from such resin molded products.
The use of the invention according to (2) is highly effective in improving the efficiency of burr removal.

According to the deburring device of the third aspect of the present invention, deburring can be efficiently performed, and the frequency of iron maintenance can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an operating state of a deburring device of the present invention.

FIG. 2 is a schematic view illustrating an operating state of the deburring device of the present invention.

FIG. 3 is a schematic diagram illustrating an operating state of the deburring device of the present invention.

FIG. 4 is a schematic view illustrating an operating state of the deburring device of the present invention.

FIG. 5 is a schematic view illustrating a modified example of the operating state of the deburring device of the present invention.

[Explanation of symbols]

1: Resin molded product 1a: Metal hoop 1b: Small resin member 2: Bali 3: High temperature iron 4: Pilot hole 5: Medium temperature iron

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masami Onishi             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 4F201 AR06 AR07 BA08 BC01 BC02                       BC12 BC15 BQ48 BS02 BS10

Claims (3)

[Claims] 1. A high-temperature trowel heated to a temperature not reaching the melting temperature of the resin with respect to the burr remaining on the resin molded product,
Soften the burr by bringing it close to the burr so that it does not come into contact with the burr, and then the softened burr is at a temperature lower than the temperature of the high temperature iron and the burr does not adhere to the batter when the iron is pressed against the burr. A method for removing burrs from a resin molded product, which comprises crushing burrs by pressing a medium temperature iron heated to above. 2. The burr removal method for a resin molded product according to claim 1, wherein the burr removal of the resin molded product is a simultaneous molding hoop in which a large number of small resin members are integrated with the metal hoop. 3. A fixture for supporting a resin molded product, a high temperature iron heated to a temperature not reaching the melting temperature of the resin,
Position the medium temperature iron and the high temperature iron and medium temperature iron with respect to the resin molded product at a temperature lower than the temperature of the high temperature iron and heated to a temperature at which the burr does not adhere to the iron even when the iron is pressed against the burr. Equipped with a trowel moving mechanism to move by
The iron moving mechanism moves the relative positions of the resin molded product and the high temperature iron and medium temperature iron to bring the high temperature iron close so as not to contact the burr remaining on the resin molded product to soften the burr, and then to the softened burr. A deburring device for resin molded products, characterized by pressing a medium temperature iron to crush the burr.