JPH05278043A - Method and device for removing burr - Google Patents

Abstract

PURPOSE:To prevent a burr which has been produced on a peripheral edge of a hole of a hot melt resin product on one surface thereof during the production process from adhering and remaining on the surface of the resin product. CONSTITUTION:In a pin 10 having a conical tip end, a slant face 11 is coated with an adhesion preventive layer 12 to a resin. The slant face of the pin 10 heated by a heating wire 13 and controlled to a predetermined temperature by a temperature sensor 14 is inserted to a hole 1 formed in a hot melt resin product. In this manner, a burr 2 which has been produced on the edge of the hole on one surface of the product is thermally melted to be fused to the inner peripheral edge of the hole 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for removing burrs formed on one surface of the peripheral edge of a center hole of an optical disk, such as a compact disk or a video disk, on which information is optically recorded. Burr removal method and apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, an optical disc A of this type has been injection-molded, but its sprue runner B has
The sprue runner B, which is provided at the center of the optical disk, that is, the central hole 1, is punched out by a punch C as shown in FIG. Will occur.

When the reflective film is formed on the signal recording surface of the master in the state where the burr 2 is generated, the burr 2 is detached during transportation before the process or during the process. Then, as shown in FIG. 5, it may be attached to the signal recording surface. When the reflection film is formed in this state, the burr 2 portion becomes a pinhole 3 as shown in FIG. The signal recorded in the part will not be reproduced correctly.

For this reason, conventionally, after the center hole 1 is formed, the center hole 1 is formed by the vacuum cap D as shown in FIG.
The peripheral edge is sucked to suck the burr 2 and the burr 2 is removed, or, as shown in FIG. 8, cutting is performed with a conical tool E.

[0005]

However, the burr 2 formed by pressing often remains in a state of being connected to the central hole 1, and it is difficult to remove it only by vacuum suction. During the transportation to the next process or during the setting in the next process, it falls off and adheres to the optical disc A, and becomes a pinhole 3 in the process of forming the reflective film.

Also, when cutting with the blade E, the cutting powder 4 scatters as shown in FIG. 8, and the scattered cutting powder 4 is attracted to the optical disk A by static electricity, etc. However, when forming the reflective film, the pinhole 3 often occurs and an error occurs.

The present invention is intended to solve the above-mentioned problems in removing burrs from holes in a conventional heat-melting resin, and heat-welding burrs generated on the peripheral edge of one surface of the holes. SUMMARY OF THE INVENTION It is an object of the present invention to provide a burr removal method and a device for melting the burr integrally with the periphery of a hole so that the burr does not adhere to and remain on the surface of a resin that is melted by heat.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for removing burrs for achieving the above-mentioned object. The method is to remove burrs generated by punching a hole of resin to be melted by heat. A pin for preventing adhesion of molten resin is formed on the surface of the pin whose tip has a conical slope, and the slope of the pin, which is controlled to a predetermined temperature, is inserted into the center hole and formed around the one surface of the center hole. The burr that is being made is softened by heat,
The method is characterized by being welded to the inner edge portion of the center hole.

As an apparatus for carrying out the above method, the tip is formed into a conical slant surface so as to be pressed against the peripheral edge of the hole of the resin to be melted by heat, and a layer for preventing adhesion of the molten resin is formed on the surface. It is characterized by comprising a formed pin, a heating wire attached to the pin, and a temperature sensor for detecting the temperature of the pin and controlling the heating wire to a constant temperature.

[0010]

According to the method and apparatus for removing burrs of the present invention, the burrs generated on the peripheral edge of the hole of the resin to be melted by heat are pressed against the heated conical surface of the pin to melt the burrs. This burr is removed by being melted and integrated with the peripheral edge of one surface of the central hole.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example for carrying out the method of the present invention for removing burrs generated in the center hole of an optical disk will be described below with reference to FIGS. As shown in FIG. 1, the pin 10 used as the deburring device is formed with a conical sloped surface 11 at the tip thereof, and the sloped surface 11 is coated with an adhesion preventing layer 12 of molten resin such as fluororesin. The melted thermoplastic resin of the optical disk A is prevented from adhering to the slope 11.

Then, in the portion directly below the slope 11,
The heating wire 13 is wound, and the pin 10 is heated by passing an electric current through the heating wire 13. Further, a temperature sensor 14 is built in the center of the pin 10, and the temperature sensor 14 senses the temperature of the pin. The temperature of 10 is controlled so as to maintain a constant temperature.

Then, the slope 11 of the pin 10 which is kept at a constant temperature is pressed against the surface of the center hole 1 of the optical disc A where the burr 2 is generated.
At the same time, a part of the inner edge portion of the center hole 1 of the optical disc A is melted and formed on the tapered surface 15 as shown in FIG.
Are removed.

When the thermoplastic resin of the disk A is melted by the slope 11, the molten thermoplastic resin is converted into the slope 1.
What is attached to No. 1 to be stretched to form a thread is that the adhesion prevention layer 12 coated on the slope 11 prevents the adhesion and does not form a thread.

The pressure and time for the pin 10 to be pressed against the optical disk A must be changed depending on the type of thermoplastic resin and the temperature of the pin 10. The temperature setting of the pin 10 is set to the glass transition temperature of the resin. When the temperature is set to 20 ° C. higher than Tg, the pressure bonding can be performed with a low pressure.

When acrylic resin is used as the material of the optical disk A, the temperature of the heater 10 is Tg =
Since it is 120 ° C, 120 ° C + 20 ° C = 140
Set to ° C, the weight of the optical disc A, that is, 100
If pressure is applied to the slope 11 of the pin 10 with a pressure of about g,
The welding of the burr 2 and the shaping of the inner edge of the central hole 1 are completed in 0.1 to 1.0 sec.

Therefore, when removing the burrs, the burrs 2 are almost completely removed from the surface of the optical disc A due to the scattering of chips and the imperfect suction, and the pinholes are attached to the surfaces of the burrs 2. Therefore, the signal loss of the optical disc A can be prevented.

Although the above-described embodiments have explained the method and apparatus for removing the burr in the center hole of the optical disk, the invention is not limited to the optical disk, and the burr in the hole formed in the heat-melting resin product is removed. It can also be applied in cases.

[0019]

As described above, according to the present invention, the conical slope of the heated pin is pressed against the inner edge of the hole of the heat-melting resin in which the burr remains so that the burr is removed from the inner edge of the hole. Since burrs can be removed by welding while forming an inclined surface, for example, when applied to an optical disc, there is no loss of signal in the pinhole of the reflection film of the signal recording surface, faithful reproduction can be performed, and the inner edge of the center hole In the molding state, the taper surface can be neatly molded, and therefore, the appearance is not spoiled.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a deburring process of a heater according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the inner peripheral edge portion of the center hole of the optical disc processed by the above.

FIG. 3 is a cross-sectional view before punch punching in an injection molding state.

FIG. 4 is a sectional view of the punch punching process of the same.

FIG. 5 is a perspective view before a reflection film forming step.

FIG. 6 is a perspective view when a reflective film is formed.

FIG. 7 is a perspective view at the time of vacuum suction for removing burrs.

FIG. 8 is a perspective view during a cutting process for removing burrs.

[Explanation of symbols]

 A optical disk 1 center hole 2 burr 10 pin 11 slope 12 adhesion prevention layer 13 heating wire 14 temperature sensor

Claims (2)

[Claims] 1. A burrs generated by punching a hole of a heat-melting resin, such as a press, has a molten resin adhesion preventing layer formed on the surface of a pin having a conical sloped tip. The slant surface of the pin controlled to a predetermined temperature is inserted into the center hole, and a burr formed around one surface of the center hole is softened by heat and is welded to the inner edge portion of the center hole. Deburring method. 2. A pin having a conical sloped tip and a molten resin adhesion-preventing layer formed on the surface thereof so as to be pressed against the peripheral edge of a hole of heat-melting resin, and the pin is attached to the pin. A deburring device, comprising: a heating wire; and a temperature sensor for detecting the temperature of the pin to control the heating wire at a constant temperature.