JP2004130483A - Deburring method of molded article and deburring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deburring method of a molded article and a deburring device capable of efficiently and certainly removing simple molding burr or burr such as a film unnecessary part without generating flaw on the surface of the molded article. <P>SOLUTION: In this deburring method of the molded article, burr is removed by projecting a projecting material 1 to the molded article 2. As the projecting material 1, a substantially columnar polyamide-based projecting material 1 where diameter is about between 0.3 mm and 0.6 mm and one side length is about between 0.3 mm and 0.8 mm is projected to the molded article 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a deburring method and a deburring apparatus for removing molding burrs generated on a resin molded product and an end portion (burr) of a film formed at the same time. The present invention relates to a deburring method and a deburring apparatus for deburring a molded product.
[0002]
[Prior art]
Many of the molded products obtained by molding the resin molding material are manufactured by molding, but the molded product immediately after being removed from the mold includes molding burrs generated on the outer surface during molding. However, the end of the simultaneously formed film remains.
[0003]
Conventionally, in order to remove the molding burrs and film edges, a dedicated mold capable of removing the burrs and film edges has been used to remove the burrs and film edges. In a dedicated mold, for example, the removed portion is sandwiched between the molds, and the molds are pressed against each other to remove burrs and film edges.
[0004]
[Problems to be solved by the invention]
However, according to the above-described conventional method, there is a case where a cut product is left behind. Although the finishing operation is manually performed on the uncut portion, there is a problem that the manual finishing operation requires time and effort.
[0005]
In addition, since there is an error in the dimensions of the molded product, the clearance between the molded product and the mold is not constant. If the clearance is large, uncut portions are generated. However, there is a problem that the surface of the molded article is easily damaged and the surface of the molded article is damaged. In order to solve these problems, it is necessary to frequently perform adjustment and maintenance of the mold.
[0006]
Alternatively, there is known a so-called shot blast in which a blast material is sprayed on a molded product in order to remove burrs on the molded product, and burrs are removed from the molded product by an impact of the projected material.
[0007]
In the case of a resin molded product, an optimal one is selected from a variety of materials as a projection material according to the material and surface hardness of the molded product. For example, a synthetic resin projection material is selected (for example, And Patent Document 1).
[0008]
[Patent Document 1]
JP-A-11-291262 (page 2)
[0009]
However, as shown in Patent Document 1, even if a projection material that is not easily scratched is used, the particle size of the projection material is not appropriate, or the time for projecting the projection material is not appropriate, so that the surface of the molded article is not properly formed. In some cases, scratches occurred or burrs could not be sufficiently removed. For this reason, conventionally, when performing deburring by shot blasting, there is no problem even if the surface has scratches or dents or burrs remain. Not only had to be implemented on the side.
[0010]
In addition, in automotive interior parts such as console panels and switch bases, there is a type in which a film with a pattern is integrally bonded at the same time as molding of a resin molded product, and a design such as wood grain is applied to the surface (for example, Patent Document 2).
[0011]
[Patent Document 2]
JP-A-10-235679 (pages 2 to 4)
[0012]
When removing unnecessary parts (burrs) such as film edges protruding from the resin molded product, the conventional shot blasting may impair the gloss and gloss of the surface. Removal was required, and the work was troublesome.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method and a method for deburring a molded product capable of efficiently and reliably removing burrs such as mere molding burrs and unnecessary portions of a film without causing scratches on the surface of the molded product. An object of the present invention is to provide a picking device.
[0014]
[Means for Solving the Problems]
According to the method for deburring a molded product according to claim 1 of the present invention, the object is a method for deburring a molded product by projecting a blast material onto the molded product. This problem is solved by projecting a substantially cylindrical polyamide-based projection material having a diameter of approximately 0.3 mm or more and 0.6 mm or less and a side length of approximately 0.3 mm or more and 0.8 mm or less as the projection material.
[0015]
As described above, in the deburring method of the molded article of the present invention, the resin molded article has a substantially cylindrical shape having a diameter of approximately 0.3 mm or more and 0.6 mm or less and a side length of approximately 0.3 mm or more and 0.8 mm or less. By performing the deburring by projecting the polyamide-based blasting material, it is possible to reliably remove burrs without damaging the surface of the molded product.
[0016]
Incidentally, without damaging the product, and in order to surely deburr, when the molded article is in a stationary state, when the polyamide-based shot material is projected for a projection time of about 15 seconds or more and 240 seconds or less. It is suitable. Further, when the molded article is in a continuous moving state, it is preferable to project the polyamide-based blasting material for a projection time of approximately 20 seconds to 480 seconds.
[0017]
The deburring apparatus for a molded article according to the present invention is a deburring apparatus for a molded article which performs deburring by projecting a projection material onto the molded article. A projection means for projecting in a projection time of not more than seconds, and a substantially cylindrical polyamide-based projection having a diameter of about 0.3 mm or more and 0.6 mm or less and a side length of about 0.3 mm or more and 0.8 mm or less. Supply means for supplying a material.
[0018]
Further, the molded product deburring device of the present invention is a molded product deburring device that performs deburring by projecting a projection material onto the molded product, and a projection unit that projects the projected material onto at least the molded product. Supply means for supplying the projection means with a substantially cylindrical polyamide-based projection material having a diameter of about 0.3 mm or more and 0.6 mm or less and a side length of about 0.3 mm or more and 0.8 mm or less; And a transferring means for passing the polyamide-based blasting material through the projection range of the polyamide-based blasting material for about 20 seconds or more and 480 seconds or less.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, but can be variously modified within the scope of the present invention.
[0020]
FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a graph showing the relationship between the size of the blast material and the blasting time, and FIG. 2 is an explanation showing an example of a single shot blast device. FIG. 3 is an explanatory view showing an example of a conveyor type shot blasting apparatus, and FIG. 4 is an explanatory view of a main part of the conveyor type shot blasting apparatus shown in FIG.
[0021]
In the present invention, shot blasting removes molding burrs of resin molded products, terminal portions of resin films and resin sheets formed at the same time, and unnecessary portions (hereinafter, all of them are included in “burrs”). To a method and apparatus. As a shot material (also called a shot material), a shot material made of a polyamide resin is used. In this example, nylon is used as the polyamide resin.
[0022]
The projectile is made of substantially cylindrical plastic particles. The shot material is projected onto the surface of the molded product by a shot blast device, and burrs are removed from the molded product by the impact of the shot material.
[0023]
The graph of FIG. 1 shows the relationship between the size of the blast material and the blast time when deburring a molded product using a single shot blast device. As shown in the drawing, when the particles of the blast material become larger than the size indicated by the point a in the figure, a dent is formed on the product surface immediately after the blast material is projected. If the particles of the blast material are smaller than the size indicated by the point b in the figure, the burrs of the molded product cannot be completely removed even if the blasting is performed for a long time.
[0024]
Further, even if the projection material has a particle size not too large or too small as described above, it is necessary to set the projection time according to the particle size. If the projection time is not set in accordance with the size of the particles, as shown in the drawing, burrs are left uncut, and the surface of the molded product is fogged.
[0025]
In the present example, the size of the particles of the blast material is a cylindrical shape having a diameter (φ) of approximately 0.3 mm or more and 0.6 mm or less, and a length of one side (l) of approximately 0.3 mm or more and 0.8 mm or less. In the case of the above shot blasting device, the projection time is set to be approximately 15 seconds to 240 seconds or less, and in the case of the conveyor type shot blasting device, the projection time is set to be approximately 20 seconds to 480 seconds and shot blasting to a molded product is performed. Shall be.
[0026]
FIGS. 2 to 4 schematically show an example of a shot blasting apparatus for removing burrs of a molded product (hereinafter, referred to as “work 2”) by using a blast material 1. FIG. 2 shows a shot blast device 10 of a single shot type, and FIGS. 3 and 4 show a shot blast device 20 of a conveyor type.
[0027]
A single shot blast device 10 shown in FIG. 2 includes, in a box, a projection device 11 as projection means, a screen 12 for selecting burrs larger than the projection material 1, and a projection material provided below the screen 12. A storage container 13, an antistatic agent supply device 14, and an air supply device 15 are provided. The duct 11b of the projection device 11 and the projection material storage container 13 constitute a projection material supply unit. One or more shot blasting devices 10 are provided.
[0028]
The projection device 11 includes an impeller 11a for injecting the projection material 1 and a duct 11b for transporting the projection material 1. The impeller 11a has a plurality of blades, and is configured to eject the blast material 1 by rotating the blades at a high speed. In this example, the blast material 1 is configured to be ejected from above, but the invention is not limited thereto, and the blast material 1 may be ejected from a lateral direction, a downward direction, or an oblique direction.
[0029]
The duct 11b has an upper end connected to the impeller 11a and a lower end located at a lower part of the apparatus. Due to the injection of the blast material 1 from the impeller 11a, the inside of the duct 11b is at a negative pressure. The projection material 1 is accumulated at the lower part of the apparatus after the injection, but since the lower end of the duct 11b is located at the place where the projection material 1 is accumulated, the projection material 1 is sequentially sucked up by the duct 11b, and the impeller 11a Transported and used repeatedly.
[0030]
The projection material 1 ejected from the projection device 11 toward the work 2 collides with the work 2 placed on the mounting table 17 to remove burrs. The mounting table 17 is in the form of a net so that the projection material 1 can pass therethrough. After removing the burrs of the work 2, the blast material 1 falls along with the removed burrs below the apparatus. A screen 12 for selecting burrs larger than the blast material 1 and a guide plate 16 for guiding a falling object to the screen 12 are provided below the apparatus.
[0031]
The screen 12 is configured to be vibrated by the motor 12a and to screen the burrs dropped on the screen 12 from the projection material 1. Further, below the screen 12, there is provided a projection material storage container 13 which is an accumulation portion of the projection material 1. The shot materials 1 sorted by the screen 12 are accumulated in the shot material storage container 13. The accumulated projection material 1 is sucked into the duct 11b as described above, and is repeatedly used. In this example, the configuration is such that the projectile 1 is sucked up by the duct 11b. However, the present invention is not limited to this, and the projectile 1 may be circulated by other means such as a bucket elevator.
[0032]
An antistatic agent supply device 14 and an air supply device 15 are connected to the duct 11b. The antistatic agent supply device 14 includes an antistatic agent storage unit (not shown) and an antistatic agent supply tube 14a connected to the antistatic agent storage unit. The antistatic agent supply tube 14a is connected to the duct 11b. Are linked. The antistatic agent supply pipe 14a is provided with a valve 14b. When the valve 14b is open, the antistatic agent is sprayed from the antistatic agent supply pipe 14a into the duct 11b. By introducing the antistatic agent, the generation of static electricity in the projectile 1 is prevented, and the projectiles 1 do not stick to each other or adhere to the work 2, so that burrs can be suitably removed.
[0033]
The air supply device 15 includes an air tank 15a and an air supply pipe 15b connected to the air tank 15a, and the air supply pipe 15b is connected to the duct 11b. The air supply pipe 15b is provided with a valve 15c. When the valve 15c is opened, high-pressure air is introduced from the air supply pipe 15b into the duct 11b. By introducing high-pressure air, the blast material 1 is quickly transported in the duct 11b, and is also vigorously jetted from the impeller 11a, so that deburring is performed efficiently. Note that a configuration without the air supply device 15 may be adopted.
[0034]
In the single shot blast device 10 of this example, the work 2 is projected in a stationary state. At this time, if the projection time is set to be approximately 15 seconds or more and 240 seconds or less, burrs are surely formed without damaging the product surface. Can be removed.
[0035]
In addition, by making the projection device 11 of the single shot blast device 10 movable with respect to the work 2, it is possible to remove burrs from the work 2 having a larger size.
[0036]
In this case, first, projection is performed on a predetermined portion of the work 2 in a stationary state for about 15 seconds to 240 seconds. Next, the projection device 11 is moved to another location on the workpiece 2, and projection is performed again at the moved location. By repeating this, all burrs of the work 2 are removed.
[0037]
Instead of moving the projection device 11, the mounting table 17 on which the workpiece 2 is mounted may be moved. Alternatively, both the projection device 11 and the mounting table 17 may be movable. In addition, if a large number of the projection devices 11 are arranged so as to expand the projection range, it is possible to efficiently remove burrs even with a larger work 2.
[0038]
The conveyor type shot blast device 20 shown in FIGS. 3 and 4 includes a belt conveyor device 21 as a transfer unit on which the workpiece 2 is placed and transported, a plurality of projection devices 22 as a projection unit, and a belt conveyor device 21. , A screen 24 for selecting burrs larger than the projection material 1, an antistatic device 25, an air blow device 26, a dust collecting device 27, a cyclone 28, A material circulation device 29 is provided. The supply means of the blast material 1 includes the duct 22 b of the blast device 22, the dust collecting device 27, the cyclone 28, and the blast material circulating device 29.
[0039]
The shot blast device 20 is controlled by a control device (not shown). The control device controls the belt conveyor device 21, the projecting device 22, the screen 24, the antistatic device 25, the air blowing device 26, the dust collecting device 27, the cyclone 28, and the projecting material circulating device 29, and operates them in a predetermined procedure.
[0040]
The belt conveyor device 21 is a net conveyor, in which a belt-like net circulates and transfers the work 2 placed on the net. By using the net conveyor, the blast material 1 projected on the work 2 passes through the net and is collected below the apparatus.
[0041]
Like the single shot type shot blast device 10, the projection device 22 includes an impeller 22a for injecting the projection material 1 and a duct 22b for transporting the projection material 1. In addition, in the shot blast device 20 of this example, three projection devices 22 are provided, but the invention is not limited to this. Further, in this example, the blast material 1 is configured to be ejected from above, but the invention is not limited thereto, and the blast material 1 may be ejected from a lateral direction, a downward direction, or an oblique direction.
[0042]
A curtain chamber 23 is provided upstream and downstream of the belt conveyor device 21. In the curtain chamber 23, high-pressure air is blown to the work 2 by the antistatic ion air supply device 25b and the air blow device 26 described below. By blowing high-pressure air, dust, projecting material 1 and burrs attached to the work 2 are blown off, but the dust, projecting material 1 and burrs are blocked by the curtain and are prevented from scattering around.
[0043]
The antistatic device 25 includes an antistatic agent supply device 25a and an antistatic ion air supply device 25b. The antistatic agent supply device 25a includes an antistatic agent storage section 25c and a supply pipe 25d connected to the antistatic agent storage section 25c. The supply pipe 25d is provided along the belt conveyor device 21, and the duct 22b of the injection nozzle 22 is connected to the supply pipe 25d. An antistatic agent is sprayed into each duct 22b from a supply pipe 25d.
[0044]
The antistatic ion air supply device 25b is installed in a curtain chamber 23 provided on the upstream side of the shot blast device 20. The antistatic ion air supply device 25b blows out ion air at high pressure, and the static electricity of the work 2 is removed by the ion air.
[0045]
The air blow device 26 is installed in the curtain chamber 23 provided on the downstream side of the shot blast device 20. The air blow device 26 blows out high-pressure air, and the high-pressure air blows off the blast material 1 and burrs attached to the work 2.
[0046]
The dust collecting device 27 includes a suction port 27a located above the curtain chamber 23. From the suction port 27a, dust, the projection material 1 and burrs blown off by the antistatic ion air supply device 23b and the air blow device 26 are removed. Suction. The dust, the projection material 1 and the burrs collected by the dust collecting device 27 are introduced into the cyclone 28 shown in FIG. 4, and the projection material 1 having a usable particle size is separated. The projection material 1 is discharged to a position below the projection device 22 and reused.
[0047]
The shot material circulation device 29 is a screw conveyor, and is installed in a range from the upstream side of the shot blast device 20 to a position below the projection device 22 and a range from the downstream side of the shot blast device 20 to a position below the projection device 22. ing. The shot material circulating device 29 transfers the shot material 1 dropped below the shot blast device 20 on the upstream side and the downstream side to the position below the projection device 22.
[0048]
FIG. 4 shows a flow of the shot material 1 in the shot blast device 20. The flow of the shot material 1 is indicated by arrows. As shown, the blast material 1 projected from the impeller 22a falls along with the removed burrs, and is separated from the burrs by a screen 24 provided with a vibration motor provided below the apparatus. Then, it is sucked up by the duct 22b, transported to the impeller 22a, and used repeatedly. Also, the blast material 1 collected by the dust collecting device 27 and then separated by the cyclone 28 is collected and reused below the device.
[0049]
In the case of the conveyor type shot blasting device 20, the work 2 is placed on the belt conveyor device 21 and moves continuously, and the projection is performed while passing under the plurality of projection devices 22. For this reason, the projection time at the point where the projection is performed at the highest pressure from each projection device 22 is shorter than the projection in a stationary state. For this reason, regarding the projection time in the conveyor type shot blast device 20, the projection is performed in a longer projection time than in the case of the single shot blast device 10.
[0050]
In this example, it is assumed that the projection is performed for about 20 seconds to 480 seconds. That is, the work 2 placed on the belt conveyor device 21 is passed within a range where the projection material 1 is projected from the projection device 22 for about 20 seconds to 480 seconds.
[0051]
【The invention's effect】
As described above, according to the deburring method and the deburring apparatus for a molded product of the present invention, the molding burr of the molded product and the integrally molded film can be formed without any trouble as conventionally performed manually. Ends (burrs) can be efficiently and reliably removed without damaging the surface of the molded product.
[0052]
For this reason, decorative films printed with designs and patterns such as grain are laminated and integrated on the surface, and scratches and dents are generated on the molded product surface even with glossy and glossy surfaces. Unnecessary portions (burrs) of the film can be removed without performing the above, and a high effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between the size of a projection material and the projection time.
FIG. 2 is an explanatory diagram showing an example of a single shot blast device.
FIG. 3 is an explanatory view showing an example of a conveyor type shot blast apparatus.
FIG. 4 is an explanatory view of a main part of the conveyor type shot blasting apparatus shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Projection material 2 Work 10 Single shot blast device 11 Projection device 12 Screen 13 Projection material storage container 14 Antistatic agent supply device 15 Air supply device 16 Guide plate 20 Conveyor type shot blast device 21 Belt conveyor device 22 Projection device 23 Curtain chamber 24 Screen 25 Antistatic device 25a Antistatic agent supply device 25b Antistatic ion air supply device 26 Air blow device 27 Dust collection device 28 Cyclone 29 Projectile material circulation device

Claims (5)

What is claimed is: 1. A method for deburring a molded product, comprising: removing a deburred material by projecting a projection material onto the molded product, wherein the projected material has a diameter of about 0.3 mm or more and 0.6 mm or less and a length of one side of about 0 mm. A deburring method for a molded product, comprising projecting a substantially cylindrical polyamide-based blasting material having a diameter of 3 mm or more and 0.8 mm or less. 2. The deburring method for a molded product according to claim 1, wherein, when the molded product is in a stationary state, the polyamide-based shot material is projected for a projection time of approximately 15 seconds to 240 seconds. The deburring method according to claim 1, wherein when the molded product is in a continuous moving state, the polyamide-based blast material is projected for a projection time of approximately 20 seconds to 480 seconds. What is claimed is: 1. A deburring apparatus for deburring a molded article by projecting a projection material onto the molded article, comprising: a projection unit for projecting the projected material onto at least the molded article for a projection time of about 15 seconds to 240 seconds. Supply means for supplying a substantially cylindrical polyamide-based blasting material having a diameter of about 0.3 mm or more and 0.6 mm or less and a side length of about 0.3 mm or more and 0.8 mm or less, to the projection means. Deburring device for molded products. A deburring apparatus for deburring a molded product by projecting a projection material onto the molded product, comprising: a projecting means for projecting a projected material onto at least the molded product; A supply means for supplying a substantially cylindrical polyamide-based blasting material having a length of about 0.3 mm or less and a side length of about 0.3 mm or more and 0.8 mm or less; A deburring device for a molded article, comprising: a transfer means for passing the light in a period of at least 480 seconds.

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