JP2004114205A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector, by which chips do not stick to a polymer mold product by preventing scattering of the chips, and also scattering of fragments of a rotary cutting tool can be prevented when the rotary cutting tool is broken. <P>SOLUTION: The dust collector is provided with a cylindrical dust collecting duct 11, in which a cutting point of an endmill 15 for cutting a resin plate 1 is contained such that at least the cutting point for cutting the resin plate 1 is not exposed to the outside. The dust collecting duct 11 is provided with an aperture 12 having the minimum essential size for bringing only the part of the resin plate 1 neighboring on the machining part from the outside of the dust collecting duct 11 to the endmill 15 located inside the dust collecting duct 11. The inside of the dust collecting duct 11 is sucked so that the chips 1b of the resin plate 1 produced by the endmill 15 do not scatter out of the aperture 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dust collector that is used in combination with a cutting machine for cutting a polymer molded article and that prevents scattering of cutting chips generated when cutting a polymer molded article.
[0002]
[Prior art]
2. Description of the Related Art There is a conventional polymer molded product dust collecting apparatus in which cutting dust is sucked by a dust collecting hole member that is opened at a distance below a tool (for example, see Patent Document 1).
In addition, there is a type in which a nozzle for blowing out static elimination air is provided above the tool and downward toward the tool, and cutting chips are sucked by a long hole that opens at a distance below the tool (for example, see Patent Document 2). .
In addition, the rotary cutting tool that cuts the polymer molded product protrudes the vicinity of the cutting point where the polymer molded product is cut out, and a hollow dust collection duct that includes the area other than the vicinity of the cutting point is provided. There is a device that sucks dust (for example, see Patent Document 3).
[0003]
[Patent Document 1]
JP-A-10-24428 (pages 5-6, FIGS. 1, 5)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 2001-260075 (Pages 3-4, FIG. 1, FIG. 2)
[Patent Document 3]
JP-A-5-162144 (pages 4 to 5, FIGS. 5 and 6)
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional dust collector, there is a distance between the tool and the dust collecting hole member or the long hole for sucking the cutting chips, so that the effect of preventing the scattering of the cutting chips may be insufficient. Was. In addition, even if a dust collection duct including a rotary cutting tool is provided, the effect of preventing scattering of cutting chips may still be insufficient because the vicinity of the cutting point of the rotary cutting tool is outside the dust collection duct. In particular, when plastic gate cut processing (gate cut, mirror cut, and varicut) is performed on a light guide plate used as a back panel of a liquid crystal display device, when cutting chips adhere to the light guide plate being processed or the processed light guide plate. Since the light guide plate becomes a defective product, it has been required to strictly prevent the cutting chips from adhering to the light guide plate.
[0005]
Therefore, an object of the present invention is to solve the above-mentioned problem, prevent scattering of cutting chips, prevent cutting chips from adhering to a polymer molded product, and reduce scattering of fragments of the rotating cutting tool when the rotating cutting tool is damaged. Is also to prevent.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the dust collecting apparatus of the present invention accommodates at least a cutting point for cutting a polymer molded product of a rotary cutting tool for cutting a polymer molded product so as not to protrude outside. Provide a cylindrical or box-shaped dust collection duct, and provide an opening of the minimum size necessary to allow only the vicinity of the processed part of the polymer molded article to enter from the outside of the dust collection duct to the internal rotary cutting tool. The invention is characterized in that the dust collecting duct is provided in the dust collecting duct, and the inside of the dust collecting duct is sucked so that cutting dust of the polymer molded article by the rotary cutting tool is not scattered outside from the opening.
[0007]
The rotary cutting tool is not particularly limited, and examples thereof include an end mill cutter and a face mill cutter.
[0008]
The term “cylindrical” includes any state of a cylinder whose both end surfaces are closed, a tube whose one end surface is closed and the other end surface is open, or a tube whose both end surfaces are open. When one or both end faces are open, the cutting point of the rotary cutting tool is 8 mm or more (more preferably 15 mm or more) from the open end face, although it depends on the opening area and the suction capacity. Is preferred. Further, a partial notch or hole for accommodating the rotary cutting tool inside the cylinder may be provided on the peripheral surface of the cylinder or a part of the closed end surface. Although it depends on the opening area and the suction capacity, it is preferable that the cutting point of the rotary cutting tool is located at least 2 mm (more preferably, at least 4 mm) inside the notch or hole.
When the end face of the cylinder is largely open, even if the suction is performed, the air current is hardly restricted in the vicinity of the opening, and it is difficult to generate a fast air flow into the interior of the cylinder. It is preferable to provide a cutting point in the case of the above-mentioned partial cutout or hole, since the airflow is narrowed even in the vicinity of the notch or the hole, and a high-speed airflow into the inside of the cylinder is easily generated. The “tubular” shape is not particularly limited, and examples thereof include a cylinder and a square tube.
[0009]
The “box shape” includes any state of a box in which all surfaces are closed and a box in which a certain surface is open. When a certain surface is open, it depends on the opening area and the suction capacity, but it is preferable that the cutting point of the rotary cutting tool is 8 mm or more (more preferably 15 mm or more) inside the open surface. . Further, a part of the closed surface may be provided with a partial notch or a hole for accommodating the rotary cutting tool inside the box, and in this case, the opening area of the notch or the hole or the suction area may be provided. Although it depends on the performance, it is preferable that the cutting point of the rotary cutting tool is located 2 mm or more (more preferably, 4 mm or more) inside the notch or hole.
The reason for the numerical value is the same as the reason described in the section of “tubular”. The “box-like” shape is not particularly limited.
[0010]
The "minimum required size" is not particularly limited, but the polymer molded article is moved by the precision of a device for moving the polymer molded article when the vicinity of the processed portion of the polymer molded article is entered into the opening. The size is preferably such that it does not touch the opening even if it slightly shifts.
[0011]
The type of the polymer molded article is not particularly limited, but a plastic that requires a plastic gate cut processing (gate cut, mirror cut, varicut) can be exemplified, and those which dislike the attachment of cutting chips such as a light guide plate can be exemplified. Is particularly effective. The shape of the polymer molded article is not particularly limited, and examples thereof include a thick bulk resin, a resin plate, a resin rod, and a cylindrical resin. The processed part is not particularly limited, but may be a wide surface or a narrow end surface of the polymer molded article. In addition, when the polymer molded article and the processed portion are a resin plate and its end face, the opening is not particularly limited, and has a slit width larger than the thickness of the resin plate by a minimum margin, It is preferable that both ends of the slit are slit-shaped openings that are curved or bent so that a straight line connecting both ends of the slit reaches the internal rotary cutting tool.
[0012]
The “required minimum margin” is not particularly limited, but it is preferable to provide 2 mm to 5 mm above and below the resin plate.
[0013]
The means for sucking the inside of the dust collection duct is not particularly limited, and a suction port provided in the dust collection duct, an axial fan connected to the suction port, an electric blower, a duct fan, a turbo fan, a sirocco fan, A combination with a vacuum pump or a vacuum generator can be exemplified. Further, the position of the suction port is not particularly limited, but is preferably provided below the dust collection duct in consideration of the spontaneous fall of the cutting chips.
[0014]
It is preferable to provide an air blowing device that blows air near the cutting point of the polymer molded article by the rotary cutting tool to blow off cutting chips into the dust collecting duct. The air blowing device is not particularly limited, and examples thereof include a combination of an air outlet provided in the dust collection duct and an air pump for sending air to the air outlet. Although the position where the air outlet is provided is not particularly limited, the upper part of the dust collection duct is preferable for blowing down cutting chips downward.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an end face cutting machine for cutting an end face of a resin plate 1 (a light guide plate used as a backlight of a liquid crystal panel in this embodiment) of a polymer molded product formed by an injection molding machine (not shown). The end face cutting machine includes a roughing machine 10 for performing gate cutting by roughly cutting an end face of the resin plate 1, a mirror processing machine 20 for performing mirror finishing, and a clamp 2 for gripping the resin plate 1. A stage 4 linearly moves left and right on the rail 3.
[0016]
When the resin plate 1 gripped by the clamp 2 is moved from the right end to the left end of the rail 3, the remaining rear end surface of the gate (not shown) of the resin plate 1 is rough-cut by the roughing machine 10 and the mirror finishing machine 20. The roughing machine 10 and the mirror-finishing machine 20 are subjected to the roughing (gate-cutting) by the machine 10, and then the mirror-finish processing by the mirror-finishing machine 20 is performed on the rear end face of the resin plate 1 after the roughing. Position has been adjusted. The roughing machine 10 and the mirror-finish machine 20 may be provided with only one of them.
[0017]
First, FIGS. 2 to 4 show a first embodiment in which the present invention is embodied in a dust collector of a roughing machine 10. An end mill 15 for cutting the end face 1 a of the resin plate 1 is rotatably provided in the roughing machine 10. The end mill 15 is attached via a chuck 14 to a motor 13 which is vertically erected with a rotating shaft extending downward. Below the chuck 14, there is provided a cylindrical dust collection duct 11 that accommodates at least a cutting point for cutting at least the end face 1 a of the resin plate 1 of the end mill 15 so as not to protrude outside.
[0018]
The dust collection duct 11 includes a vertically extending cylindrical portion 11a and a top plate portion 11b that substantially closes an upper open end of the cylindrical portion 11a. The top plate portion 11b is provided with a small gap between the top plate portion 11b and the chuck 14 such that the top plate portion 11b and the chuck 14 do not interfere with each other. The top plate portion 11b is formed to be slightly larger than the cross section of the cylindrical portion 11a, and a notch 11c for allowing the end mill 15 to pass through is formed at the center from the front end.
[0019]
An opening 12 having a minimum size is provided in the dust collecting duct 11 so that only the vicinity of the end face 1a as a portion to be processed of the resin plate 1 can enter from the outside of the dust collecting duct 11 to the internal end mill 15. I have. The opening 12 has a slit width that is larger than the thickness of the resin plate 1 by a necessary minimum margin and has a slit-like shape in which both ends of the slit are curved such that a straight line connecting both ends of the slit reaches the internal end mill 15. It is an opening.
[0020]
That is, the opening 12 is provided on the front side of the peripheral surface at the upper end of the cylindrical portion 11a. Further, as shown in FIG. 4, when the thickness of the resin plate 1 is t (about 3 mm to 12 mm) and the slit width of the opening 12 is t1 (about 7 mm to 16 mm), the gap between the opening 12 and the resin plate 1 is A space of, for example, 2 mm to 5 mm is left above and below the resin plate 1, and the opening 12 is, for example, 120 mm in the circumferential direction of the dust collection duct around the front position of the dust collection duct 11. The opening 12 has a curved slit shape, extending at an angle of degrees. Further, as shown in FIG. 3B, the end mill 15 protrudes from the straight line connecting the left end 12 a and the right end 12 b to the front side of the opening 12.
[0021]
A suction device (not shown) for sucking the inside of the dust collection duct 11 so that the cutting chips 1b of the resin plate 1 by the end mill 15 are not scattered outside from the opening 12 is connected to the lower end of the dust collection duct 11.
[0022]
In addition, an air blowing device is provided near the end mill 15 in the dust collection duct 11 to blow air near the cutting point of the resin plate 1 by the end mill 15 to blow off cutting chips 1b into the inside of the dust collection duct 11. . The air blowing device includes an air pump (not shown) and an air tube 16 having one end connected to the air pump. The other end of the air tube 16 is dust-collected from a hole provided on the side of the notch 11c of the top plate 11b. The direction is adjusted so that the air inserted from the air pump is blown against the end mill 15 while being inserted into the duct 11. In addition, static elimination air may be used as air.
[0023]
Therefore, by using the dust collecting device of the first embodiment, the end mill 15 is rotated while the resin plate 1 held by the clamp 2 is moved in parallel with the stage 4. Then, as shown in FIG. 4, the resin plate 1 enters the opening 12 from the left end of the rear end of the resin plate 1 from the right side, and the remaining rear end surface of the gate (not shown) of the resin plate 1 is roughly cut by the end mill 15. Start to be. Then, the resin plate 1 cut by the end mill 15 generates cutting chips 1 b, and the cutting chips scatter around the end mill 15. However, since the dust collecting duct 11 accommodates the cutting point of the end mill 15 so as not to protrude outside, the cutting dust 1b is confined inside the dust collecting duct 11 and scattered outside the dust collecting duct 11. Is prevented. Further, since the opening 12 is provided with a minimum size, the cutting waste 1 b is prevented from scattering from the opening 12 to the outside of the dust collection duct 11. Further, since a suction device for sucking the inside of the dust collection duct 11 is provided, a flow toward the suction device from the opening 12 or the notch 11 c occurs in the air inside the dust collection duct 11 and the opening 12 or the notch is formed. The cutting chips 1b are prevented from leaking out of the dust collecting duct 11 from the dust collecting duct 11 and the cutting chips 1b are prevented from adhering to the resin plate 1 due to static electricity. This prevents the cutting chips 1b from adhering not only to the resin plate 1 being processed but also to another processed resin plate 1. Further, the frequency of cleaning the entire processing machine including the roughing processing machine 10 is reduced, and a favorable working environment can be maintained. Further, the dust collecting duct 11 improves safety by accommodating the cutting point of the end mill 15 therein, and not only the cutting waste 1b but also the fragments of the end mill 15 to the outside of the dust collecting duct 11 when the end mill 15 is damaged. Spattering can be prevented.
[0024]
In addition, the air blown from the air tube 16 blows off the cutting chips 1b which are about to be scattered by the centrifugal force of the end mill 15 and the cutting chips 1b adhering to the end mill 15 into the inside of the dust collecting duct 11, and the cutting is performed. The debris 1b is quickly sucked by the suction device following the flow of air toward the suction device inside the dust collection duct 11. By blowing the air, the effect of preventing the cutting chips 1b from adhering to the resin plate 1 can be further enhanced.
[0025]
By using the dust collecting apparatus as described above, it is possible to prevent the swarf 1b from being scattered at the time of rough cutting of the resin plate 1 (at the time of gate cutting), so that not only the resin plate 1 being processed but also another resin that has been processed. The cutting waste 1 b can be prevented from adhering to the plate 1. In particular, the dust collecting effect is enormous by using it for processing of a light guide plate that does not like the attachment of cutting chips. In addition, when the end mill 15 is damaged, the fragments of the end mill 15 are confined in the dust collecting duct 11 to prevent the fragments from scattering.
[0026]
Next, FIGS. 5 to 7 show a second embodiment in which the present invention is embodied in a dust collecting device of the mirror finishing machine 20. A face mill 25 that cuts the end surface 1 a of the resin plate 1 is rotatably provided on the mirror finishing machine 20. The face mill 25 is co-rotatably attached to a rotating shaft of a motor 23 provided with the rotating shaft extending forward. A box-shaped dust collection duct 21 is provided around the face mill 25 to house at least a cutting point for cutting at least the end surface 1a of the resin plate 1 of the face mill 25 so as not to protrude outside.
[0027]
The dust collection duct 21 is formed in a hollow rectangular parallelepiped shape extending vertically. On the rear wall of the dust collecting duct 21, a round hole 21 a for allowing the rotating shaft of the motor 23 to pass through the inside of the dust collecting duct 21 is formed with a minimum inner diameter that does not interfere with the rotating shaft of the motor 23. I have.
[0028]
The face mill 25 includes a disk-shaped base 25a and four blades 25b. The blades 25b are mounted at four positions at 90-degree angular intervals on the front surface of the base 25a so as to extend radially from the center of the base 25a. I have.
[0029]
An opening 22 having a minimum size is provided in the dust collection duct 21 so that only the vicinity of the end face 1a as a portion to be processed of the resin plate 1 can enter from the outside of the dust collection duct 21 to the inside face mill 25. ing. In addition, the opening 22 has a slit width larger than the thickness of the resin plate 1 by a minimum margin, and both ends of the slit are bent so that a straight line connecting both ends of the slit reaches the internal face mill 25. It has a slit-shaped opening.
[0030]
That is, the opening 22 is provided on the upper front side of the dust collection duct 21. As shown in FIG. 7, when the thickness of the resin plate 1 is t (about 3 mm to 12 mm) and the slit width of the opening 12 is t1 (about 7 mm to 16 mm), the gap between the opening 22 and the resin plate 1 is reduced. A space of, for example, 2 mm to 5 mm is left above and below the resin plate 1, and the opening 22 is not limited to the left and right ends of the front wall of the dust collection duct 11 but extends in the depth direction of the left wall. The opening 22 has a bent slit shape extending to a middle part and a middle part in the depth direction of the right wall. 6B, the blade 25b of the face mill 25 projects from the straight line connecting the left end 22a and the right end 22b of the opening 22 to the front side of the opening 22.
[0031]
A suction device (not shown) is provided to suck the inside of the dust collection duct 21 so that the cutting chips 1b of the resin plate 1 by the face mill 25 are not scattered outside from the opening 22. A pipe 27 is formed at the center of the bottom wall of the dust collection duct 21 so as to extend downward and communicates with the inside of the dust collection duct 21. The suction device is connected to the lower end of the pipe 27.
[0032]
In addition, near the face mill 25 in the dust collection duct 21, there is provided an air blowing device that blows air near a cutting point of the resin plate 1 by the face mill 25 to blow off cutting chips 1 b into the inside of the dust collection duct 21. ing. The air blowing device includes an air pump (not shown) and an air tube 26 having one end connected to the air pump. The air blowing device is provided with a hole formed at a position slightly forward in the center of the top wall of the dust collection duct 21. The other end of the air tube 16 is inserted into the inside of the dust collection duct 21, and the direction is adjusted so that the air sent from the air pump is blown from directly above the blade 25b. In addition, static elimination air may be used as air.
[0033]
Therefore, by using the dust collecting apparatus of the second embodiment, the face mill 25 is rotated while the resin plate 1 held by the clamp 2 is moved in parallel with the stage 4. Then, as shown in FIG. 7, the resin plate 1 enters the opening 22 from the left end of the rear end of the resin plate 1 from the right side, and the rear end surface of the resin plate 1 starts to be mirror-finished by the face mill 25. Then, the resin plate 1 cut by the face mill 25 generates cutting chips 1b, and the cutting chips 1b scatter around the face mill 25. However, since the dust collection duct 21 accommodates the cutting point of the face mill 25 so as not to protrude outside, the cutting waste 1 b is trapped inside the dust collection duct 21 and scatters outside the dust collection duct 21. Is prevented. Further, since the opening 22 is provided with the minimum necessary size, the cutting chips 1 b are prevented from scattering from the opening 22 to the outside of the dust collection duct 21. Further, since the suction device for sucking the inside of the dust collection duct 21 is further provided, the air in the dust collection duct 21 flows from the opening 22 or the round hole 21a toward the suction device, and the opening 22 or The cutting chips 1b are prevented from leaking out of the dust collection duct 21 from the round holes 21a, and the cutting chips 1b are prevented from adhering to the resin plate 1 due to static electricity. This prevents the cutting chips 1b from adhering not only to the resin plate 1 being processed but also to another processed resin plate 1. In addition, the frequency of cleaning the entire processing machine including the mirror-surface processing machine 20 is reduced, and a favorable working environment can be maintained. In addition, the dust collection duct 21 accommodates the cutting point of the face mill 25 therein to improve safety, and not only the cutting chips 1b but also the fragments of the blade 25b when the blade 25b of the face mill 25 is damaged are collected. It is possible to prevent the duct 21 from scattering outside.
[0034]
In addition, the air blown from the air tube 26 blows off the cutting chips 1b that are about to be scattered by the centrifugal force of the face mill 25 and the cutting chips 1b attached to the face mill 25 into the dust collecting duct 21, The cutting waste 1b is quickly sucked by the suction device along the flow of air toward the suction device inside the dust collection duct 21. By blowing the air, the effect of preventing the cutting chips 1b from adhering to the resin plate 1 can be further enhanced.
[0035]
By using the dust collecting apparatus as described above, it is possible to prevent the cutting chips 1b from scattering at the time of mirror-finish processing of the resin sheet 1 so that not only the resin sheet 1 being processed but also another resin sheet 1 which has been processed has the cutting chips. 1b can be prevented from adhering. In particular, the dust collecting effect is enormous by using it for processing of a light guide plate that does not like the attachment of cutting chips. Further, when the blade 25b of the face mill 25 is damaged, fragments of the blade 25b can be confined inside the dust collection duct 21 to prevent the fragments from scattering.
[0036]
Note that the present invention is not limited to the above-described embodiment, and may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as described below.
(1) The slit width of the opening is appropriately changed according to the thickness of the polymer molded article.
(2) Changing the rotary cutting tool appropriately.
(3) Change the air blown to the rotary cutting tool to static elimination air.
(4) Applicable to roughing machines without gate cut.
[0037]
【The invention's effect】
As described in detail above, according to the dust collecting apparatus of the first, second, and third aspects, it is possible to prevent the cutting chips from adhering to the polymer molded article by preventing the cutting chips from scattering. In particular, a great effect can be obtained by using it for processing of a light guide plate or the like that refuses to attach cutting chips. In addition, it is possible to prevent fragments of the rotary cutting tool from scattering when the rotary cutting tool is damaged.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an entire processing machine according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a dust collector according to the first embodiment of the present invention.
3A is a front view and FIG. 3B is a side view of the dust collector.
FIG. 4 is a perspective view showing a dust collecting state of the dust collecting device.
FIG. 5 is a perspective view showing a dust collecting apparatus according to a second embodiment of the present invention.
6A is a front view and FIG. 6B is a side view of the dust collector.
FIG. 7 is a perspective view showing a dust collecting state of the dust collecting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin board 1b as a polymer molded article Cutting chips 11 Dust collection duct 12 Opening 15 End mill as a rotary cutting tool

Claims (3)

A rotary cutting tool for cutting a polymer molded article, wherein a cylindrical or box-shaped dust collecting duct is provided for accommodating at least a cutting point for cutting the polymer molded article so as not to protrude outside; The dust collecting duct is provided with an opening of a minimum size required to allow only the vicinity of the processed part to enter from the outside of the dust collecting duct to the inside of the rotary cutting tool, and the height by the rotary cutting tool is provided. A dust collecting device that sucks the inside of the dust collecting duct so as to prevent cuttings of the molecular molded product from scattering from the opening to the outside. The polymer molded article and the portion to be processed are a resin plate and its end face, and the opening has a slit width larger than the thickness of the resin plate by a minimum margin and a straight line connecting both ends of the slit. 2. The dust collecting apparatus according to claim 1, wherein both ends of the slit are curved or bent so as to reach the rotary cutting tool inside. The dust collector according to claim 1 or 2, further comprising an air blowing device that blows air near a cutting point of the polymer molded article by the rotary cutting tool to blow off cutting chips into a dust collecting duct.

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