JPH05419A - Finishing device of parting part of plastic molded article - Google Patents

Abstract

PURPOSE:To finish the parting part of a molded article by cutting at uniform accuracy by a method wherein a cutting jig is run along guide grooves provided integral with the fixed part, to which the plastic molded article to be finished is fixed. CONSTITUTION:In the device concerned, a fixed part 1, to which a plastic molded article 12 is fixed, a travelling guide, part 4, which is integrally formed with the fixed part 1 and has the predetermined positional relationship with the fixed part, and a rotary cutting jig 2, at the tip of which a cemented carbide grinding disc 6 is installed, are provided. Next, the cutting jig 2 is travelled through travelling function 10 along travelling guide parts 4 so as to move the grinding disc 6 at the tip of the cutting jig 2 under the condition being abutted against the parting part 13 of the molded article 12 in order to cut and remove the parting part at stable accuracy at all times.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting and removing a parting part during surface finishing of a molded product such as an injection molded product made of plastic.

[0003]

2. Description of the Related Art Generally, on the surface of a plastic molded product manufactured by a molding method such as injection molding, a thin linear burr (parting portion) is apt to occur at a portion corresponding to a seam of a mold. There was a problem in appearance or function. Therefore, conventionally, such a parting portion is cut and removed with a knife, a file or the like to finish the surface of the molded product.

[0004]

However, in such a conventional method, not only the finishing accuracy varies depending on the skill level of the worker, but also the trained worker's attention is distracted due to fatigue and the like. In that case, there is a problem in that the finish accuracy is deteriorated and the product yield is significantly reduced.

The present invention has been made in order to solve such a problem, and always cuts a parting portion of a plastic molded product such as an injection molded product with stable and high precision to obtain a product of good quality. An object is to provide a parting part finishing device that can be obtained.

[0006]

[Constitution of the invention]

[0007]

A parting part finishing apparatus for a plastic molded product according to the present invention is provided with a fixing part for fixing the plastic molded product and a predetermined position relative to the fixing part. And a rotary cutting jig having a tip made of a cemented carbide grinding machine, and a mechanism for moving the cutting jig along the traveling guide part. It is characterized by

[0008]

In the finishing apparatus of the present invention, the rotary cutting jig is moved along the traveling guide portion formed by the traveling mechanism so as to have a predetermined positional relationship such as having a certain distance from the fixed portion of the plastic molded product. As the rotating cutting jig travels, the parting part of the plastic molded product fixed to the fixed part always has stable accuracy by the cemented carbide grinder attached to the tip of the cutting jig. The product is finished by cutting with a good appearance.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a partially sectional front view showing an embodiment of a parting part finishing apparatus of the present invention, and FIG. 2 is a side view thereof.

As shown in these figures, the finishing apparatus of the embodiment comprises a molded product fixing jig 1 and a cutting jig 2. The molded product fixing jig 1 includes a fixing protrusion 3 having the same shape as the inner peripheral part of the plastic molded product to be finished,
2 formed integrally on both sides of the protrusion 3
It consists of a parallel running guide groove 4 of the book,
Is provided so that its position and engraved shape have a predetermined correlation with the parting part of the plastic molded product.

The cutting jig 2 is composed of an air grinder 5 which rotates at high speed by compressed air, and a rotary bar 6 made of cemented carbide attached to the tip thereof, and a U-shaped handle 7 is projectingly provided on the upper portion thereof. It is attached to the formed support frame body 8 by pressing metal fittings 9 and is supported horizontally. Further, wheels 10 are attached to the lower portions of both ends of the support frame 8 via mounting plates 11, respectively.
The molded product fixing jig 1 is configured to roll in the grooves of the two running guides 4. Furthermore, the difference in height between the lower end of the wheel 10 and the rotary bar 6 is
0 is equal to the difference in height between the surface of the traveling guide groove 4 in contact with the part of the molded product to be finished.

In order to finish the parting part using the apparatus of the embodiment thus constructed, first, a molded article 12 made of a thermoplastic resin to be finished is
The molded product fixing jig 1 is mounted so as to cover the protruding portion 3 of the molded product fixing jig 1. At this time, the inner peripheral surface of the molded product 12 is adhered and fixed so that the inner peripheral surface of the molded product 12 is closely adhered to the outer peripheral surface of the protruding portion 3 and no gap is formed. Next, the air grinder 5 is operated and the rotary bar 6 attached to the tip thereof is rotated. And
In this state, the operator grips the handle 7 and causes the wheel 10 to travel along the travel guide groove 4, so that the rotary bar 6 is brought into contact with the parting portion 13 of the molded product 12 and moved along this.

When operated in this manner, the difference in height between the running guide groove 4 with which the wheel 10 comes into contact and the parting portion 13 of the molded product 12 is always constant, which is the lower end of the wheel 10 and the rotary. Since it corresponds to the height difference from the bar 6,
The parting portion 13 is cut and removed from one end to the other with a constant accuracy, and a uniform finish is obtained.

[0015]

As is apparent from the above description, according to the apparatus of the present invention, a plastic molded product to be finished is fixed, and a cutting jig is provided along a guide groove provided integrally with this fixing portion. The parting part of the molded product can be cut and finished with uniform accuracy simply by running. Then, it is possible to obtain a product of stable quality with little variation regardless of which worker.

Particularly, the apparatus of the present invention is effective for finishing a parting part of a molded product made of glass fiber reinforced plastic, and can exert a great effect for finishing a curved parting part having a curvature of 300 mm or more.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention.

FIG. 2 is a side view of the same embodiment.

[Explanation of symbols]

 1 ………… Molded product fixing jig 2 ………… Cutting jig 3 ………… Fixing protrusion 4 ………… Running guide groove 5 ………… Air grinder 6 ………… Rotary bar 7 ………… Handle 8… Support frame 10 Wheel 12 Plastic molded product 13 Parting part

Claims (1)

Claim: What is claimed is: 1. A fixed part for fixing a plastic molded product, a running guide part integrally formed with the fixed part so as to have a predetermined positional relationship with the fixed part, and a tip. A parting part of a plastic molded product, comprising: a rotary cutting jig having a cemented carbide grinder attached thereto and a mechanism for causing the cutting jig to travel along the travel guide part. Finishing equipment.