JP4074286B2 - Part line polishing method for resin molded products - Google Patents

Description

  The present invention relates to a method for polishing a part line of a resin molded product before a resin plating process, and in particular, a resin molded product for polishing a part line formed around a resin molded product having uneven portions, corner portions, and curved surface portions. This relates to a part line polishing method.

  Since a resin molded product to be subjected to resin plating is likely to crack after the resin plating, the part line of the outer peripheral portion formed at the time of resin molding, that is, a flash or a step is polished. Moreover, it is necessary to polish a part line about the resin molded product which a human hand touches directly. For example, as shown in FIG. 6, a synthetic resin handle 51 is used to polish a part line 52 formed at the joint portion during molding.

  Conventionally, for each part line of such resin molded products, each resin molded product has been manually polished. However, it took about 30 seconds to 2 minutes or more to polish one resin molded product, and the polishing process took a long time. Moreover, manual polishing has many variations, and it has been difficult to maintain a constant quality of the product.

  Thus, a technique for automatically polishing a resin molded product has been proposed. For example, as disclosed in Japanese Patent Application Laid-Open No. 2000-176807 “Resin deburring device for resin molded products”, a deburring method for resin molded products for removing deburring on the outer periphery of a plate-shaped resin molded product. A plurality of the resin molded products are stacked, and the one or more rotating brushes are in contact with the outer peripheral portion of the stacked resin molded product, and the rotating brush is rotationally driven while the stacked resin molded products are stacked. There has been proposed a deburring method for a resin molded product, in which the outer peripheral portion of each resin molded product is sequentially removed by relatively moving the product and the rotating brush in the stacking direction of the resin molded product.

Further, Patent Document 1 discloses a first guide part that guides and supports a resin molded product in a laminated state so that a part of the outer peripheral part is exposed and movable in the lamination direction, and a resin molded product on the first guide part. The first rotating brush that removes the flash of the exposed portion and the first guide portion are provided so as to be connected to the first guide portion, and the flash is not removed by the first rotating brush on the outer peripheral portion of the laminated resin molded product. A second guide portion that exposes the portion and guides and supports the movable portion in the stacking direction; a second rotating brush that removes flash of the exposed portion of the resin molded product on the second guide portion; and each resin molded product A moving mechanism for moving the laminated resin molded product in the laminating direction on the first and second guide portions so that the flash of the outer peripheral portion is sequentially removed by the first and second rotating brushes. Deburring resin molded products characterized by Devices have been proposed.
JP 2000-176807 A

  Even if the deburring method and deburring device of Patent Document 1 have an outer peripheral shape having a slit, the deburring operation is performed without damaging portions other than the flash of the resin molded product and in an aligned state. The flash of the outer peripheral part of a plate-shaped resin molded product like a block of a block belt can be removed. However, it is difficult to polish the part line of the outer peripheral part of the resin molded product having both the uneven part and the curved part such as a handle made of synthetic resin. That is, the resin molded product having a complicated shape has a problem that its part line cannot be polished smoothly.

  Further, in the deburring method and deburring apparatus of Patent Document 1, since a rotating brush is employed, the polishing surface of the resin molded product is easily scratched in the rotation direction, and defects in subsequent resin plating are likely to occur. There was a problem that it was easy to become a product that was uncomfortable when touched.

  The present invention has been developed to solve such problems. That is, the object of the present invention is to combine part polishing formed by a polishing belt and finish polishing with a plate-shaped abrasive material around a resin molded product having uneven portions, corner portions, and curved portions. It is an object of the present invention to provide a part-line polishing method for a resin molded product, which can be rapidly and continuously polished and the polished surface can be finished to be smooth.

According to the present invention, the part of the resin molded product that polishes the part line (52) formed at the time of mold molding at the joint around the resin molded product (W) having the concavo-convex part, the corner part and the curved surface part. In the line polishing method, for the concave part of the part line (52) formed in the resin molded product (W), there is no difference in polishing force between the start and end of the part line (52). In this way, the polishing surface of the polishing belt (1) whose peripheral speed is variable during use is brought close to and pressed while being polished, and the corners and curved surfaces of the part line (52) formed on the resin molded product (W) As for the part, while moving the resin molded product (W) in a direction substantially perpendicular to the surface of the polishing belt (1) so that the part line (52) rubs the polishing surface of the polishing belt (1). Part line around the resin molded product (W) 52) is continuously polished so that the part line (52) is smooth, and subsequently, the concave part and the corner part of the part line (52) around the resin molded product (W). For the curved surface portion, the part line around the resin molded product (W) while moving the resin molded product (W) so that the part line (52) rubs the surface of the plate-like abrasive (3). By polishing (52), there is provided a part-line polishing method for a resin molded product, characterized in that finish polishing is performed so as to round the edge portion generated by polishing of the polishing belt (1).

For example, a part-line polishing method for a resin molded product in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven portion, a corner portion, or a curved surface portion. And about the concave-shaped part of the part line (52) in which the said resin molded product (W) was formed, this part line (52) is set so that there may be no difference in polishing force at the start and end of polishing. About the corners and curved surface shape parts of the part line (52) formed on the resin molded product (W) by polishing while pressing the polishing surface of the polishing belt (1) whose peripheral speed is variable during use. The part line around the resin molded product (W) while moving the resin molded product (W) in a substantially horizontal direction so that the part line (52) rubs the polishing surface of the polishing belt (1). By polishing (52) continuously The part line (52) is polished so as to be smooth, and subsequently the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W) The part line (52) around the resin molded product (W) is continuously moved while moving the resin molded product (W) in a substantially horizontal direction so that the surface 52) rubs the surface of the plate-like abrasive (3). By performing polishing, finish polishing is performed so as to round the edge portion generated by the polishing of the polishing belt (1).

Alternatively, the rotational speed of the plate-shaped abrasive material (3), so that its difference in polishing power polishing start and end does not occur, and variable during use of the plate-shaped abrasive material (3), or the The vibration speed of the plate-like abrasive (3) is varied during use of the plate-like abrasive (3).

The part line (52) around the resin molded product (W) is finish-polished while the plate-like abrasive (3) is eccentrically rotated.
Part line around the resin molded product (W) while varying the amplitude of vibration of the plate-like abrasive (3) during use so that there is no difference in polishing force between the start and end of polishing. (52) is finish-polished.

In the present invention, the resin molded product (W) is attached to the part line (52) formed around the resin molded product (W) having the concavo-convex portion, the corner portion, and the curved surface portion while the polishing belt (1) is separated from and contacted. By polishing and further polishing the part line (52) of the curved surface portion, the resin molded product (W) can be polished so as to have a smooth polished surface. Or conversely, after polishing the part line (52) of the curved surface portion, the part line (52) of the concave portion can be continuously polished.
Subsequent to the continuous polishing of the polishing belt (1), the resin molding is performed so that the part line (52) around the resin molded product (W) rubs against the rotating or vibrating plate-like abrasive (3). The part line (52) around the resin molded product (W) can be continuously polished while moving the product (W) in a substantially horizontal direction, and the polishing finish can be completed smoothly. In particular, in the finish polishing with the plate-like abrasive (3), the edge portion of the resin molded product (W) generated by the polishing of the polishing belt (1) can be rounded. It is possible to prevent “blowing” and “cracking” that occur when the product (W) is resin-plated.
In addition, the resin molded product (W) can be quickly polished by combining polishing with the polishing belt (1) and finish polishing with the rotating plate-like abrasive (3).

  Since there is a large difference in polishing force between the start and end of polishing of the polishing belt (1), the peripheral speed can be varied during use, so that the polishing process can be made uniform while maintaining the polishing effect constant. .

Regarding the rotational speed, vibration speed, etc. of the plate-like abrasive (3), there is a large difference in polishing power at the start and end of the polishing. Therefore, it can be varied during use so that the polishing effect is maintained while maintaining the polishing effect constant. Can be homogenized.
By polishing the part line (52) around the resin molded product (W) while rotating the plate-shaped abrasive (3) eccentrically, the polishing surface is not damaged in the rotational direction. be able to. Similarly, by polishing the part line (52) around the resin molded product (W) while varying the amplitude of vibration of the plate-like abrasive (3), the polished surface is not damaged. can do.

  The present invention relates to a resin molded product that combines continuous polishing with a polishing belt and continuous polishing with a plate-shaped abrasive for part lines formed on a resin molded product having irregularities, corners and curved surfaces. This is a part line polishing method.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a process diagram showing a part-line polishing method for a resin molded product according to the present invention. FIG. 2 is an explanatory front view of a polishing belt and a plate-like abrasive used when carrying out the part-line polishing method for a resin molded product of the present invention. FIG. 3 is an explanatory configuration plan view of a polishing belt and a plate-like abrasive used when carrying out the part-line polishing method for a resin molded product of the present invention. In FIG. 1, a standard polishing process for polishing a synthetic resin handle as the resin molded product W will be described.
First, the resin molded product W to be polished is set on a jig (not shown). For example, in a handle made of a synthetic resin, a jig is fitted in a portion where a hole or slit for holding a handle shaft is opened so that unnecessary shaking does not occur. While starting this jig | tool, in order to make the grinding | polishing surface of the grinding | polishing belt 1 close to the resin molded product W, the pad 2 arrange | positioned inside the grinding | polishing belt 1 is pressed. This is because even the part line 52 formed on the outer peripheral part of the resin molded product W having the uneven part, the corner part or the curved part is polished smoothly.

  The polishing by the polishing belt 1 is intended to remove the flash or step because the flash or step of the part line 52 becomes a starting point of swelling or cracking when the resin molded product W is resin-plated.

It is a top view which shows the operation | movement state of the resin molded product of this invention of FIG. 4, (a) to (e) is the state of the grinding | polishing process by an abrasive belt, (f) to (j) is by plate-shaped abrasives. This is a state of finish polishing.
The part line 52 of the concave portion of the resin molded product W is polished while being pressed against the polishing belt 1, and then the pad 2 is retracted to retract the polishing belt 1 (see FIG. 2). By changing the position of the polishing belt 1 as described above, even a resin molded product having a recess (one surface of the resin molded product W) can be automatically polished. When the concave part line 52 is curved, it is polished to follow the curved surface.

Subsequently to the concave part part line 52, as shown in FIGS. 4A to 4E, the part line 52 around the resin molded product W is resin-molded so that the surface of the polishing belt 1 is rubbed. While moving the product W in a substantially horizontal direction, a part line (2 to 3 surfaces of the molded product) around the resin molded product W is continuously polished. Thus, smooth polishing of the part line 52 can be performed.
In the illustrated example, the state in which the resin molded product W is moved in the substantially horizontal direction with respect to the polishing belt 1 rotating in the vertical direction and the part line 52 around the resin molded product W is polished. In addition to this, it is also possible to polish the part line 52 of the resin molded product W by moving the resin molded product W in the substantially vertical direction with respect to the polishing belt 1 rotating in a substantially horizontal direction. The polishing direction can be changed according to the shape of the resin molded product W.

  The polishing belt 1 is reduced in polishing power due to clogging of the polished resin. During the operation of the polishing belt 1, it is possible to polish the resin molded product W while removing the attached polishing wrinkles. When the polishing wrinkles were not removed, when several tens of the resin molded products W were polished, the new polishing belt 1 was replaced. However, it has become possible to polish up to several thousand pieces by removing the polishing wrinkles on the way. Therefore, it is possible to reduce the consumption of the polishing belt 1 and reduce the operation cost.

  Next, finish polishing is performed while pressing the concave part part line 52 of the resin molded product W against the rotating plate-shaped abrasive 3, and the plate-shaped polishing around which the part line 52 around the resin molded product W rotates. The part line 52 around the resin molded product W is continuously polished while moving the resin molded product W in a substantially horizontal direction so as to rub the surface of the material 3. The plate-like abrasive 3 can be vibrated instead of rotating. The finish polishing by the plate-like abrasive 3 causes “bulging” and “cracking” when the edge portion of the resin molded product W generated by the polishing of the polishing belt 1 is resin-plated. In order to prevent these, the purpose is to round this part.

Also in the finish polishing with the rotating plate-like abrasive 3, the surface of the plate-like abrasive 3 is rubbed against the part line 52 around the resin molded product W as shown in FIGS. In this way, while moving the resin molded product W in a substantially horizontal direction, the part lines around the resin molded product W (from the first surface to the second surface and the third surface) are continuously polished. Thereby, the finish polishing of the smooth part line 52 can be implemented.
In the illustrated example, the plate-shaped abrasive 3 also has the resin molded product W substantially in the horizontal direction with respect to the plate-shaped abrasive 3 that rotates about the rotation center axis arranged in the horizontal direction, as in the case of the polishing belt 1. A state in which the part line 52 of the resin molded product W is polished by moving to the above is described. In addition to this, it is also possible to polish the part line 52 of the resin molded product W by moving the resin molded product W in a substantially vertical direction with respect to the plate-shaped abrasive 3 rotating about the rotation center axis arranged in the vertical direction. Is possible.

  Thus, for the part line 52 formed on the resin molded product W having uneven portions, corner portions and curved surface portions, continuous polishing by the polishing belt 1 and continuous finish polishing by the rotating plate-shaped abrasive 3 are completed. Then, it is removed from the jig and the polishing process is completed. The next resin molded product W is set in the same process as described above.

  The peripheral speed of the polishing belt 1 does not always need to be rotated at the same peripheral speed. In the polishing method of Example 2, the peripheral speed of the polishing belt 1 is varied during use. According to the new polishing belt 1, the difference in polishing force is large between the start and end of production. Along with this, the state of the resin molded product W also has different appearances at the start and end of production. The method of changing the peripheral speed of the second embodiment aims to keep the product appearance uniform. The peripheral speed of the polishing belt 1 naturally varies depending on the material and size of the resin molded product W, the degree of protrusion of the part line, and the type of the polishing belt 1.

  Similarly, also for the new plate-like abrasive 3, the polishing speed can be made uniform by changing the rotation speed during use.

FIG. 5 is an explanatory view of a state in which the plate-like abrasive of Example 3 is eccentrically rotated.
In Example 3, the part line 52 around the resin molded product W is finish-polished while the plate-like abrasive 3 is eccentrically rotated. Thus, if the plate-like abrasive 3 is eccentric and rotated, it is possible to prevent the polishing surface from being scratched in the rotational direction.

  In Example 4, the part line 52 around the resin molded product W is finish-polished while changing the amplitude of vibration of the plate-like abrasive 3. Thus, even if the amplitude of the vibration of the plate-like abrasive 3 is varied, the polished surface can be prevented from being damaged.

  In addition, this invention is not limited to embodiment of the invention mentioned above, By combining the grinding | polishing by the grinding | polishing belt 1 and the finishing grinding | polishing by the rotating plate-shaped abrasive | polishing material 3, the part line 52 of the resin molded product W can be made quick. The method is not limited to the steps shown in the drawings as long as it can be continuously polished and the polished surface can be smoothed, and various changes can be made without departing from the scope of the present invention. Of course.

  The method for polishing a part line of a resin molded product according to the present invention can be used not only for a resin molded product having an uneven part, a corner part or a curved part, but also for polishing a part line of a resin molded product having a simple plate shape. be able to.

It is process drawing which shows the part line grinding | polishing method of the resin molded product of this invention. It is a description front view of a polishing belt and a plate-shaped abrasive used when carrying out the part-line polishing method for a resin molded product of the present invention. It is explanatory drawing top view of the polishing belt used when enforcing the part line grinding | polishing method of the resin molded product of this invention, and a plate-shaped abrasive. It is a top view which shows the operation | movement state of the resin molded product of this invention, (a) to (e) is the state of the grinding | polishing process by an abrasive belt, (f) to (j) is the finish grinding | polishing process by a plate-shaped abrasive material It is a state. It is explanatory drawing of the state which eccentrically rotates the plate-shaped abrasive | polishing material of Example 3. FIG. It is explanatory drawing which shows the part line which appeared in the handle made from a synthetic resin which is an example of a resin molded product.

Explanation of symbols

1 Abrasive Belt 2 Pad 3 Plate-like Abrasive Material W Resin Molded Product 52 Part Line

Claims (10)

A method for polishing a part line of a resin molded product, wherein a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven part, a corner part or a curved part. ,
For the concave part of the part line (52) formed in the resin molded product (W) , the peripheral speed of the part line (52) is used so that there is no difference in polishing force between the start and end of polishing. The polishing surface of the polishing belt (1), which is variable in the middle, is brought close to and polished while pressing,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By continuously polishing the part line (52) around the resin molded product (W) while moving the product (W) in a direction substantially perpendicular to the surface of the polishing belt (1), the part line Polish (52) to be smooth,
Subsequently, the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W) are rubbed against the surface of the plate-like abrasive (3). By polishing the part line (52) around the resin molded product (W) while moving the resin molded product (W), the edge portion generated by the polishing of the polishing belt (1) is rounded. A part line polishing method for a resin molded product, characterized in that finish polishing is performed. This is a part line polishing method for a resin molded product, in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having uneven portions, corner portions and curved surface portions. And
For the concave part of the part line (52) where the resin molded product (W) is formed , the peripheral speed of the part line (52) is used so that there is no difference in polishing force between the start and end of polishing. The polishing surface of the polishing belt (1), which is variable in the middle, is brought close to and polished while pressing,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By polishing the part line (52) around the resin molded product (W) continuously while moving the product (W) in a substantially horizontal direction, the part line (52) is polished smoothly. And
Subsequently, the part line (52) rubs the surface of the plate-shaped abrasive (3) with respect to the concave shape part, corner part and curved surface shape part of the part line (52) around the resin molded product (W). In addition, by continuously polishing the part line (52) around the resin molded product (W) while moving the resin molded product (W) in a substantially horizontal direction, the polishing belt (1) is polished. A part line polishing method for a resin molded product, characterized in that finish polishing is performed so that the generated edge portion is rounded. A method for polishing a part line of a resin molded product, wherein a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven part, a corner part or a curved part. ,
For the concave part of the part line (52) formed in the resin molded product (W), the part line (52) is polished while being pressed against the polishing surface of the polishing belt (1),
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By continuously polishing the part line (52) around the resin molded product (W) while moving the product (W) in a direction substantially perpendicular to the surface of the polishing belt (1), the part line Polish (52) to be smooth,
Subsequently, with respect to the concave shape portion, the corner portion and the curved surface shape portion of the part line (52) around the resin molded product (W), the part line (52) has no difference in polishing force between the start and end of polishing. In this way, while moving the resin molded product (W) so as to rub the surface of the plate-like abrasive (3) whose rotational speed can be changed during use , the part line (52) around the resin molded product (W) ) Is finished and polished so as to round the edge portion generated by polishing the polishing belt (1). This is a part line polishing method for a resin molded product, in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having uneven portions, corner portions and curved surface portions. And
For the concave part of the part line (52) in which the resin molded product (W) is formed, the part line (52) is polished while approaching the polishing surface of the polishing belt (1) and pressed,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By polishing the part line (52) around the resin molded product (W) continuously while moving the product (W) in a substantially horizontal direction, the part line (52) is polished smoothly. And
Subsequently, with respect to the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W), the part line (52) has a difference in polishing force between the start and end of polishing. While rotating the resin molded product (W) in a substantially horizontal direction so as to rub the surface of the plate-like abrasive (3) whose rotational speed can be changed during use, the periphery of the resin molded product (W) The part line polishing of the resin molded product is characterized in that the edge line generated by the polishing of the polishing belt (1) is finished and polished so as to be rounded by continuously polishing the part line (52) of Method. A method for polishing a part line of a resin molded product, wherein a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven part, a corner part or a curved part. ,
For the concave part of the part line (52) formed in the resin molded product (W), the part line (52) is polished while being pressed against the polishing surface of the polishing belt (1),
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By continuously polishing the part line (52) around the resin molded product (W) while moving the product (W) in a direction substantially perpendicular to the surface of the polishing belt (1), the part line Polish (52) to be smooth,
Subsequently, with respect to the concave shape portion, the corner portion and the curved surface shape portion of the part line (52) around the resin molded product (W), the part line (52) has no difference in polishing force between the start and end of polishing. In this way, while moving the resin molded product (W) so as to rub the surface of the plate-like abrasive (3) whose vibration speed is changed during use , the part line around the resin molded product (W) (52 ) Is finished and polished so as to round the edge portion generated by polishing the polishing belt (1). This is a part line polishing method for a resin molded product, in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having uneven portions, corner portions and curved surface portions. And
For the concave part of the part line (52) in which the resin molded product (W) is formed, the part line (52) is polished while approaching the polishing surface of the polishing belt (1) and pressed,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By polishing the part line (52) around the resin molded product (W) continuously while moving the product (W) in a substantially horizontal direction, the part line (52) is polished smoothly. And
Subsequently, with respect to the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W), the part line (52) has a difference in polishing force between the start and end of polishing. While moving the resin molded product (W) in a substantially horizontal direction so as to rub the surface of the plate-like abrasive (3) whose vibration speed can be changed during use, the periphery of the resin molded product (W) The part line polishing of the resin molded product is characterized in that the edge line generated by the polishing of the polishing belt (1) is finished and polished so as to be rounded by continuously polishing the part line (52) of Method. A method for polishing a part line of a resin molded product, wherein a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven part, a corner part or a curved part. ,
For the concave part of the part line (52) formed in the resin molded product (W), the part line (52) is polished while being pressed against the polishing surface of the polishing belt (1),
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By continuously polishing the part line (52) around the resin molded product (W) while moving the product (W) in a direction substantially perpendicular to the surface of the polishing belt (1), the part line Polish (52) to be smooth,
Subsequently, the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W) are rubbed against the surface of the plate-like abrasive (3). By polishing the part line (52) around the resin molded product (W) while moving the resin molded product (W) and rotating the plate-shaped abrasive (3) eccentrically , A part line polishing method for a resin molded product, characterized in that finish polishing is performed so as to round off an edge portion generated by polishing the polishing belt (1). This is a part line polishing method for a resin molded product, in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having uneven portions, corner portions and curved surface portions. And
For the concave part of the part line (52) in which the resin molded product (W) is formed, the part line (52) is polished while approaching the polishing surface of the polishing belt (1) and pressed,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By polishing the part line (52) around the resin molded product (W) continuously while moving the product (W) in a substantially horizontal direction, the part line (52) is polished smoothly. And
Subsequently, the part line (52) rubs the surface of the plate-shaped abrasive (3) with respect to the concave shape part, corner part and curved surface shape part of the part line (52) around the resin molded product (W). Further, the part line (52) around the resin molded product (W) is moved while the resin molded product (W) is moved in a substantially horizontal direction and the plate-like abrasive (3) is eccentrically rotated. A part-line polishing method for a resin molded product, characterized in that finish polishing is performed so as to round the edge portion generated by polishing of the polishing belt (1) by continuous polishing. A method for polishing a part line of a resin molded product, wherein a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having an uneven part, a corner part or a curved part. ,
For the concave part of the part line (52) formed in the resin molded product (W), the part line (52) is polished while being pressed against the polishing surface of the polishing belt (1),
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By continuously polishing the part line (52) around the resin molded product (W) while moving the product (W) in a direction substantially perpendicular to the surface of the polishing belt (1), the part line Polish (52) to be smooth,
Subsequently, with respect to the concave shape portion, the corner portion and the curved surface shape portion of the part line (52) around the resin molded product (W), the part line (52) has no difference in polishing force between the start and end of polishing. Thus, while moving the resin molded product (W) so as to rub the surface of the plate-like abrasive (3) whose amplitude of vibration is changed during use , the part line around the resin molded product (W) ( A part-line polishing method for a resin molded product, characterized in that finish polishing is performed so as to round the edge portion generated by polishing the polishing belt (1) by polishing 52). This is a part line polishing method for a resin molded product, in which a part line (52) formed at the time of mold molding is polished at a joint around a resin molded product (W) having uneven portions, corner portions and curved surface portions. And
For the concave part of the part line (52) in which the resin molded product (W) is formed, the part line (52) is polished while approaching the polishing surface of the polishing belt (1) and pressed,
About the corner | angular part and curved surface shape part of the part line (52) formed in the said resin molded product (W), this resin molding is carried out so that this part line (52) may rub the grinding | polishing surface of the said polishing belt (1). By polishing the part line (52) around the resin molded product (W) continuously while moving the product (W) in a substantially horizontal direction, the part line (52) is polished smoothly. And
Subsequently, with respect to the concave part, corner part and curved surface part of the part line (52) around the resin molded product (W), the part line (52) has a difference in polishing force between the start and end of polishing. The resin molded product (W) is moved while moving the resin molded product (W) in a substantially horizontal direction so as to rub the surface of the plate-like abrasive (3) whose amplitude of vibration is changed during use. Part line of a resin molded product, characterized in that the peripheral part line (52) is continuously polished so that the edge portion generated by the polishing of the polishing belt (1) is finish-polished so as to be rounded. Polishing method.