JP2011235407A - Punching apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching apparatus to be used as a punching/dust collecting system which has an improved cylindrical drill thereby having enhanced cutting efficiency, consequently surely hollows out a core to be cut and prevents the clogging caused by chips and besides has an improved dust collection function thereby having enhanced suction efficiency of chips including cut cores.SOLUTION: A hollow main shaft 12 is used as a main shaft to be rotated by drive sources 10, 20. The cylindrical drill 101 having a blade part 106 at the leading end of a cylinder body is fit to the leading end of the hollow main shaft 12 via a chuck 16. A dust collection mechanism 50 is connected to the back end of a passage 12o in the hollow main shaft 12. A material to be cut is punched while rotating the cylindrical drill through the hollow main shaft by the drive sources, so that the chips to be generated and cut cores are sucked/recovered into the dust collection mechanism 50 through the passage 12o in the hollow main shaft. The cylindrical drill 101 is constituted in such a manner that the shaft center of the cylinder body is made eccentric to the axis of a hole part 103 opened at the leading end of the cylinder body.

Description

  TECHNICAL FIELD The present invention relates to a drilling device, and more particularly to drilling using a cylindrical drill, and the work material is a fiber reinforced composite material, particularly an aircraft main wing material or a vehicle body material for a vehicle. The present invention relates to a drilling apparatus suitable for drilling a non-metallic material such as a fiber reinforced plastic) or an Al alloy.

In general, when drilling a CFRP material, a fine carbon fiber cut during processing becomes a cutting powder and is mixed in a large amount in chips, and when it is scattered in the work place, the working environment is remarkably deteriorated. It will be. For this reason, workers are taking measures such as wearing dust-proof clothing and dust-proof masks. However, since the dust is carbon fiber fine powder that is harmful to the human body, more reliable chip recovery is required.
Conventionally, in order to improve the work environment, a cylindrical drill is attached to the tip of a hollow machine spindle (spindle), and chips generated during drilling are removed from the shank of the cylindrical drill and the hollow part of the machine spindle (suction) A tool for sucking and collecting the dust collector through a hole) has been proposed (Patent Document 1).
Similarly, in a tool that uses a cylindrical drill, in order to reduce the amount of generated chips, the work material is cut out by the cylindrical drill, and the cut cutting core is sucked by the vacuum suction device through the drill hole. It has also been proposed to do so (Patent Document 2).

Japanese Utility Model Publication No. 2-35653 JP-A-2-237707

However, in the conventional techniques such as Patent Document 1 and Patent Document 2 described above, it is described that chips are sucked and collected by a dust collector connected to the hollow portion of the machine spindle. Have difficulty.
In other words, in the prior art, the suction action is caused by introducing the outside air from around the drill blade portion by the suction force from the dust collector, so that chips are sucked by the cylindrical drill at the initial stage of drilling. However, as the drilling progresses and the drill blade part enters the work material, the suction force decreases, so that chips overflow around the drill and are impractical.

In particular, in a tool in which the cutting core is cut out at the end as in Patent Document 2, it is extremely difficult to suck the cutting core together with chips with a suction device.
That is, as described in FIG. 3 of Patent Document 2, since the inside of the tip 13 protrudes toward the axis O from the inner peripheral surface of the hole 10a, chips generated during drilling are near the tip 13 in the hole 10a. (Cut clogging) is likely to occur, resulting in a problem that the cutting efficiency is lowered and the cutting resistance is increased to break the blade portion.

An object of the present invention is to provide a drilling device capable of reliably collecting and collecting chips including a cutting core generated during drilling so as to solve the above-described conventional problems. At the same time, the punching device is highly practical in use.
Specifically, by improving the cylindrical drill, the cutting core is increased by reliably cutting out the cutting core, preventing chip clogging, and in addition to that, including the cutting core by improving the dust collection function A perforated dust collection system with improved chip suction efficiency.

In the drilling device of the present invention, the main shaft rotated by the drive source is a hollow main shaft, a cylindrical drill having a blade portion is attached to the tip of the hollow main shaft via a chuck, and the rear end of the passage in the hollow main shaft A dust collecting mechanism is connected to the cylinder, and a drilling material is drilled while rotating a cylindrical drill through the hollow main shaft with the driving source, so that generated chips and cutting cores pass through the passage in the hollow main shaft to the dust collecting mechanism. The cylindrical drill is formed by a cylindrical main body that is rotated around an axis, a hole that opens at a distal end surface of the cylindrical main body, the hole and the outer peripheral surface of the cylindrical main body. A wall portion, a cutout portion notched from the front end surface of the wall portion and communicating with the hole portion, and a blade portion formed or held at a portion where the cutout portion intersects the front end surface of the wall portion, and The blade is formed at the tip in the axial direction. A bottom blade, and an inner side surface that passes through the inner edge of the bottom blade and intersects with the rake face via a ridge line, and the inner side surface has a rotational trajectory passing through the inner edge of the bottom blade and a cylindrical bottom surface. And, it is inclined in a direction away from the virtual inner cylinder side surface along the axis as it goes in the direction opposite to the rotation of the cylinder body (Claim 1).
According to the present invention, the work material (cutting core) that is hollowed out by the rotating bottom blade is cylindrical (short circle) having a cylindrical side surface along the axial center with the rotation trajectory of the inner edge of the bottom blade as the cylindrical bottom surface. Although it is formed in a columnar shape, the cutting core is easily discharged in the direction opposite to the rotation of the blade portion by the structure of the blade portion, that is, the inclination of the inner side surface of the bottom blade, thereby preventing clogging of chips.

It is preferable that the axis of the cylinder main body is configured to be shifted from the axis of the hole (Claim 2), whereby a gap is formed between the cutting core hollowed out by the blade and the wall of the cylinder main body. As a result, the fluidity and dischargeability of the cutting core are improved. Further, in order to improve the cutting performance of the cylindrical drill and increase the durability of the blade portion, the blade portion of the cylindrical drill is formed or held at the thickest portion of the wall portion (invoice) Item 3).
And, according to the cylindrical drill, since the flow and discharge properties of the cutting core are improved, it becomes possible to omit the supply of compressed air that assists the suction of chips containing the cutting core. In this case, the hollow main shaft may have a single cylinder structure. That is, the hollow main shaft has a single cylinder structure, the cylindrical drill is attached to the tip of the single cylinder main shaft via a chuck, and the dust collecting mechanism is connected to the rear end of the single cylinder main shaft. Item 4).

  However, in order to ensure the higher dust collection performance of the chips, it is optional to incorporate an air supply mechanism for supplying compressed air, and one of the embodiments is a double cylinder structure (double cylinder). Adopt the main spindle). That is, the hollow main shaft has a double cylinder structure including an inner passage and an outer passage, the cylindrical drill is attached to the tip of the double cylinder main shaft via a chuck, and compressed air is supplied to the outer passage of the main shaft. A dust collection mechanism is connected to the rear end of the inner passage, and the work material is perforated while sucking compressed air supplied through the outer passage from the periphery of the drill blade into the inner passage. By doing so, the generated chips and cutting core are sucked and collected through the inner passage to the dust collecting mechanism (claim 5).

  According to the embodiment of the present invention (Claim 5), when the cylindrical drill rotated by the drive source performs drilling while cutting the work material (workpiece), the compressed air supplied from the air supply mechanism is drilled. Since it is pumped from the peripheral wall of the blade into the cylindrical drill, fine chips generated by cutting during drilling are combined with the suction force generated in the cylindrical drill through the inner passage of the main shaft. It is collected by suction through the inner passage to the dust collecting mechanism. Then, as the drilling progresses, the work material is cut out by the drill blade portion, and when the drilling is completed, the cutting core which is the core material cut out is formed. It is collected to the dust collecting mechanism through the passage.

On the other hand, the drive source is not particularly limited as long as it is a rotary motor that rotates a single cylinder main shaft or a double cylinder main shaft. It is preferable to employ a hollow motor arranged, and in that case, the single cylinder main shaft or the double cylinder main shaft is rotatably incorporated in the rotor of the hollow motor.
Further, as a preferred embodiment, the drive source is preferably a combination of the hollow motor and the feed motor, thereby enabling automatic feed corresponding to the thickness or material of the work material. In the combination of the hollow motor and the feed motor, both motors are coaxially arranged to have a compact structure, or the feed motor is disposed in a lower position adjacent to the hollow motor in consideration of manufacturability. In any structure, the hollow motor is moved forward and backward by the feed function by driving the feed motor to pitch-feed the hollow main shaft and the cylindrical drill.

According to the present invention, due to the improved shape of the cylindrical drill, the cutting core that is hollowed out from the work material has a gap formed between the wall portion of the cylindrical main body and is easily discharged in the direction opposite to the rotation of the blade portion. Since the fluidity and dischargeability of the cutting core are increased, chip clogging is prevented. Accordingly, it is possible to adopt a single cylinder main shaft that omits the supply of compressed air that assists the suction of chips.
On the other hand, if a double cylinder spindle that improves the hollow spindle is adopted, chips are generated during drilling by supplying compressed air from the outer passage of the double cylinder spindle around the drill blade of the cylindrical drill. Since the cutting core is reliably fed into the cylindrical drill, the suction function of the inner passage of the hollow spindle can be enhanced to improve the dust collection effect and improve the working environment.

BRIEF DESCRIPTION OF THE DRAWINGS The side view which showed the outline | summary by notching some apparatuses of 1st Example of this invention. (A) is a front view of a cylindrical drill, (b) is a side view in the direction of arrow Ib in (a), (c) is a side view in the direction of arrow Ic. (A) is a perspective view of the blade part of a cylindrical drill, and its vicinity, (b) is an enlarged view of the front end surface shown to Fig.2 (a). The expanded side view of the apparatus front-end | tip part which shows the state of the termination | terminus which drills a work material. The side view which showed the outline | summary by partially notching the apparatus of 2nd Example of this invention. The expanded side view of the apparatus front-end | tip part which shows the state in the middle of drilling a workpiece.

An embodiment of the drilling device of the present invention will be described with reference to the drawings for a hand-held drill device A. FIGS. 1 to 4 show a first example in which a single cylinder main shaft is adopted as a hollow main shaft, and FIGS. 6 shows a second embodiment employing a double cylinder main shaft.
First, a first embodiment will be described. FIG. 1 is a side view schematically showing a main part of the apparatus A, with a hollow motor 10 and a feed motor 20 as drive sources provided in the housing 1. This structure is illustrated.
The housing 1 is a substantially rectangular casing, and rails 2 extending in the front-rear direction (referred to as the left-right direction in the figure) are laid on the inner bottom surface thereof with an interval in the left-right direction (referred to as the depth direction in the figure). The sliding block 3 of the hollow motor 10 is slidably mounted on the rail 2. Although not shown, a plurality of guide members are provided in the housing 1 above the rails 2, and the upper portion of the hollow motor 10 is slidably supported by the guide members.
Thereby, the hollow motor 10 is disposed in a substantially central area in the housing 1 so as to be movable back and forth.
The feed motor 20 is installed on the rear bottom surface of the housing 1 and is engaged with the motor 10 so as to move the hollow motor 10 forward and backward.

The hollow motor 10 and the feed motor 20 are not particularly limited in their types, but the servo motor is used for the hollow motor 10 and the screw motor integrated pulse motor is used for the feed motor 20. .
The hollow motor 10 is integrally provided with a mechanical main shaft (spindle) at a hollow shaft portion in a motor case 11, and the main shaft is a single cylinder main shaft 12 in which only a passage 12o penetrating along the axis is formed. The outer peripheral surface of 12 is integrally coupled to the rotor 13 so as to be rotatable.
The feed motor 20 has a feed screw 22 connected to the rotary drive shaft 21 extending below the bottom surface of the hollow motor 10, and the feed screw 22 is screwed into a feed nut (not shown) provided at the bottom of the hollow motor 10. The hollow motor 10 is moved forward and backward by the rotation of the feed motor 20.

The single-cylinder spindle 12 is provided with a collet chuck 16 at the tip so that the cylindrical drill 101 can be attached and removed by the chuck 16 and connected to a dust collecting hose 51 connected to the dust collecting mechanism 50.
The cylindrical drill 101 has a thin hollow cylindrical shape (pipe shape) including the shank 107, and a blade portion 106 is formed at the distal end portion, and a bridging hole portion 103 is formed over the entire length. Is attached to the single cylinder main shaft 12 with a collet chuck 16 so that the hole 103 and the passage 12o are communicated in a straight line. Details of the cylindrical drill 101 will be described later.

A first hood 17 that covers the front of the collet chuck 16 provided at the tip of the single cylinder main shaft 12 is provided at the tip of the hollow motor 10, and a front of the first hood 17 is covered at the tip of the housing 1. The second hood 4 is attached, and the first hood 17 is attached so as to be slidably fitted to the second hood 4. That is, the outer periphery of the cylindrical drill 101 attached to the collet chuck 16 is covered and protected by the first hood 17 and the second hood 4.
The first hood 17 and the second hood 4 may be formed integrally with the motor case 11 and the housing 1, but are preferably detachably attached as separate members.

On the other hand, a connecting tool 35 is attached to the rear end of the single cylinder main shaft 12, and the dust collecting mechanism 50 is connected to the connecting tool 35 via a dust collecting hose 51.
In addition, this connection tool 35 is made to latch the arm 36 on the rotation stop 19 which protruded from the case 11 of the hollow motor 10, and, thereby, rotation is blocked | prevented.
The dust collecting mechanism 50 includes a dust collector 50a having a suction function and a dust collecting hose 51 extending from the dust collecting mechanism 50a. The dust collecting mechanism 50 is connected to the single cylinder main shaft 12 to suck the dust collecting hose 51. A strong suction force is generated at the tip of the hole 103 of the cylindrical drill 101 through the passage 12o, and chips and the like generated when the blade 106 is drilled are collected in the dust collector 50a by the suction action. The dust collecting mechanism 50 is preferably configured so that the cyclone 52 is built in the dust collector 50a, thereby more efficiently collecting dust and the like collected.

A reference numeral 53 shown in FIG. 1 is a controller incorporating a power supply and a control unit, and the hollow motor 10 and the feed motor 20 that are controlled by the controller 53 are connected by wiring cords 54 and 55.
Further, since the drill device A is a hand-held type, as shown in FIG. 1, a handle 5 for carrying when carrying is attached to the top surface of the housing 1, and the bottom surface is used for drilling processing. A handle rod 6 serving as a support, an operation rod 7 for controlling the start / stop of the hollow motor 10 and the feed motor 20 are provided, and the controller 53 is operated by the operation rod 7. That is, although the drill device A is a hand-held type, a systemized device is illustrated by connecting accessory devices such as a dust collection mechanism 50 and a controller 53 to the hollow motor 10 or the like which is a drilling main body.

The cylindrical drill 101 will be described in detail with reference to FIG. 2 and FIG. 3. In FIG. 2, the cylindrical drill 101 includes a cylindrical main body 102, a hole 103 that opens at the distal end surface 102 a of the cylindrical main body 102, and its A wall 104 formed by the hole 103 and the outer peripheral surface 102b of the cylinder main body 102, a notch 105 cut out from the tip surface 102a of the wall 104 and communicating with the hole 103, the notch 105 and the wall 104 The blade portion 106 is formed mainly at a portion where the tip surface 102a intersects.
In this cylindrical drill 101, the shank 107 is attached to the single cylinder main shaft 12 with the collet chuck 16, whereby the rotational force of the hollow motor 10 is transmitted and the cylinder main body 102 is rotated around the axis O (FIG. 2A). In the direction of the arrow), the work material can be drilled.

  The cylinder body 102 is formed of a cemented carbide or high-speed tool steel into a substantially shaft-like body, and includes a blade portion 106 on the front end surface 102a. The outer peripheral surface 102b is reduced in outer diameter from the front end surface 102a toward the rear end. A back taper 102c having a diameter is formed in a predetermined range from the tip surface 102a. By forming the back taper 102c, the feed movement in the axial direction of the cylinder main body 102 can be performed smoothly.

  In the present embodiment, the inclination angle θ1 (see FIG. 2B) of the front end surface 102a with respect to a cross section (axial cross section perpendicular to the axis O of the cylinder main body 102) is 2 to 10 °. Thereby, both the cutting efficiency and processing accuracy of the cylindrical drill 101 can be achieved. In addition, as the inclination angle θ1 of the tip surface 102a becomes smaller than 2 °, the cutting depth during cutting tends to decrease, and the cutting efficiency tends to decrease. On the other hand, as the inclination angle θ1 becomes larger than 10 °, the wall portion 104 is easily deflected, and chatter vibration is generated, and the machining accuracy tends to be lowered.

  The hole 103 formed in the distal end surface 102a of the cylinder main body 102 is a part that accommodates chips during cutting. In this embodiment, the hole 103 has a cross-sectional outline in the cross section perpendicular to the axis of the cylinder main body 102. It is formed in a substantially circular shape. Further, the hole 103 has the same diameter from the distal end surface of the cylinder main body 102 to the shank 107 and is formed so as to penetrate in parallel with the axis O. Thereby, it is possible to prevent the chips generated during the perforation from being sucked from the hole 103 and scattered around.

  In the cross section perpendicular to the axis of the cylinder main body 102, the ratio (s / S) of the area S of the cross-sectional outline on the outer peripheral surface 102b of the cylinder main body 102 to the area s of the cross-sectional outline of the hole 103 is 0.5 to 0.8 is preferred. Thereby, both suppression of chip clogging and securing of the rigidity of the wall 104 can be achieved. Note that, as the ratio (s / S) becomes smaller than 0.5, the amount of work material to be cut increases, so that the amount of chips generated tends to increase and chip clogging tends to occur. On the other hand, as it becomes larger than 0.8, the thickness of the wall portion 104 becomes thinner and the rigidity of the wall portion 104 tends to decrease.

  Further, the hole 103 is formed at a position where its axis c is deviated from the axis O of the cylinder main body 102, and the axis c of the hole 103 is directed toward the rear end of the cylinder main body 102 on the front end surface 102 a. It is located in the part which inclines and descends from the axial center O (FIG. 2 (a) and FIG.2 (b) upper side, FIG.2 (c) paper surface back side). A wall 104 is formed by the hole 103 and the outer peripheral surface of the cylinder main body 102. Due to the deviation between the axis c of the hole 103 and the axis O of the cylinder main body 102, the thickness of the wall 104 becomes nonuniform along the rotation direction as shown in FIG. Yes.

  Here, the amount of deviation between the axis c of the hole 103 and the axis O of the cylinder main body 102 (hereinafter referred to as “eccentricity”) depends on the outer diameter D of the cylinder main body 102 but is 0.01 mm or more and 0.00. 5 mm or less is suitable. The ratio (a / D) of the eccentric amount a to the outer diameter D of the cylinder body 102 is preferably 0.8 or less. Thereby, both suppression of chip clogging and securing of the rigidity of the wall 104 can be achieved. If the amount of eccentricity is smaller than 0.01 mm, the gap (relief) between the cylindrical side surface (described later) of the work material hollowed out in a cylindrical shape by the bottom blade 106a and the hole 103 becomes small, so that chips are clogged. Is likely to occur. If the amount of eccentricity exceeds 0.5 mm or the ratio a / D exceeds 0.8, the thickness of the wall 104 on the eccentric side (the upper side in FIG. 2A) becomes thin and easily breaks. .

  The cutout portion 105 is cut out from the front end surface 102 a of the wall portion 104 and communicates with the hole portion 103, and is a portion that guides chips being cut to the hole portion 103. The notch 105 is the thickest part of the wall 104 on the tip surface 102a (the part where the wall 104 intersects the straight line s passing through the axis O starting from the axis c in the tip view in the direction of the axis O. FIG. a) The lower side is cut out with a predetermined opening width in the rotation direction (arrow direction in FIG. 2A) from the start point to the end point 105a. The end 105a of the notch 105 is not formed from the outer peripheral surface 102b toward the axis O, but toward the line where the plane passing through the axis O and the axis c and the inner peripheral surface of the hole 103 intersect. The outer peripheral surface 102b is formed. Thereby, the thickness of the wall 104 in the direction opposite to the rotation (the direction opposite to the arrow in FIG. 2A) can be gradually reduced from the blade 106 to the end 105a of the notch 105.

  In this embodiment, the central angle θ2 (see FIG. 2A) with respect to the wall 104 is set to about 240 °, but the central angle θ2 is 90 ° to 270 ° (the central angle with respect to the notch 105 is (270 ° to 90 °). Thereby, both suppression of chip clogging and securing of centripetalness can be achieved. As the central angle θ2 becomes smaller than 90 °, the centripetality is lowered and the rigidity of the wall portion 104 is lowered and tends to break. On the other hand, as the central angle θ2 becomes larger than 270 °, the opening width of the notch 105 becomes narrower, so that chips generated during cutting are less likely to enter the notch 105 and chip clogging tends to occur. Be looked at.

  The length l of the notch 105 from the bottom blade 106a in the axial direction is preferably 0.1 mm or more and less than the thickness of the work material. Thereby, improvement of cutting efficiency and ensuring of the rigidity of the wall part 104 can be made compatible. Note that, as the length l of the notch 105 becomes shorter than 0.1 mm, it is difficult to increase the depth of cut during cutting, so that the cutting efficiency tends to decrease. On the other hand, as the length l of the notch portion 105 becomes longer than the thickness of the work material, the rigidity of the wall portion 104 decreases, and chatter vibration tends to occur and breakage tends to occur.

  The blade portion 106 includes a bottom blade 106a formed at the tip in the direction of the axis O. The bottom blade 106 a is formed in a portion where the notch portion 105 and the tip end surface 102 a of the wall portion 104 intersect with each other in parallel with the cross section perpendicular to the axis of the cylinder main body 102. The blade portion 106 includes an outer peripheral blade 106c that intersects with the bottom blade 106a via an outer peripheral corner 106b. The outer peripheral edge 106c is formed in parallel to the axis O as a straight edge connected to an intersecting ridge line 102d (see FIG. 2C) between the notch 105 and the outer peripheral surface 102b of the cylinder body 102.

  Here, the clearance angle θ3 (see FIG. 2C) of the flank 106d of the blade portion 106 is preferably 2 ° to 10 °. Thereby, both reduction of flank wear and securing of cutting edge strength can be achieved. As the clearance angle θ3 becomes smaller than 2 °, the flank wear tends to increase. As the clearance angle θ3 becomes larger than 10 °, the blade edge strength tends to decrease and the bottom blade 106a tends to be damaged.

Next, the blade portion 106 of the cylindrical drill 101 and its vicinity will be described in detail with reference to FIG. 3. As shown in FIG. 3A, the blade portion 106 passes through the inner end portion 106e of the bottom blade 106a. The inner face 106h intersects with the rake face 106f and the ridge line 106g. As shown in FIG. 3 (b), the inner side surface 106h is a virtual cylindrical side surface (rotating along the axis O) along the axis O with the rotation locus r passing through the inner end 106e of the bottom blade 106a as the cylindrical bottom surface. A surface obtained by continuing the locus r from the front side of the paper to the back side of the paper is inclined in a direction away from the rotation of the cylinder main body 102 (in the direction opposite to the arrow in FIG. 2A).
As shown in FIG. 3B, the cylindrical drill 101 has a tangent t of the cross-sectional contour line of the hole 3 at the inner end portion 106e of the bottom blade 106a and the bottom blade 106a in the front end view in the direction of the axis O. Are orthogonal to each other.

  When the cylindrical drill 101 is rotated about the axis O, the work surface is cut by the bottom blade 106a and the work material is hollowed out. Therefore, the shape of the work material to be hollowed out is that of the bottom blade 106a. A cylindrical shape having a cylindrical side surface along the axis O with the rotation trajectory r of the inner end 106e as a cylindrical bottom surface. Since the inner side surface 106h is inclined away from the cylinder body 102 in the direction opposite to the rotation of the cylinder body 102 (the direction opposite to the arrow in FIG. 2A), the inclination causes the blade 106 to rotate in the opposite direction (FIG. 2A). Escape is given in the direction opposite to the arrow, making it easier to discharge chips. Thereby, chip clogging of the cylindrical drill 101 can be prevented. Further, the inclination of the inner side surface 106h is formed by shifting the axis c of the hole 103 with respect to the axis O of the cylinder main body 102 and drilling the hole 103 in the cylinder main body 102. It can be manufactured easily and productivity can be improved.

  Further, the blade portion 106 is formed at the thickest portion of the wall portion 104 (the portion where the straight line s passing through the axis O starting from the axis c of the hole portion 103 intersects the wall portion 104). Relief can be given to the inner peripheral surface of the wall 104 in the direction opposite to the rotation. As a result, friction between the wall 104 in the direction opposite to the rotation of the blade 106 and the work material can be avoided, so that the inner end 106e of the bottom blade 106a can be stably fed into the work material and the cutting performance can be improved. Can be improved.

  Furthermore, since the wall portion 104 is gradually formed thin from the blade portion 106 to the terminal end 105a of the notch portion 105, it is possible to suppress interference between the work material to be cut out and the cylindrical drill 101. As a result, eccentricity and chatter vibration of the cylindrical drill 101 during cutting can be suppressed, and breakage can be prevented.

In the above-described embodiment, the tangent t of the cross-sectional contour line of the hole 103 at the inner end portion 106e of the bottom blade 106a and the crossing angle θ4 are orthogonal (90 °) to the bottom blade 106a in the front end view in the direction of the axis O. In addition, the case where the central angle θ2 with respect to the wall portion 104 is set to about 240 ° has been described, but the present invention is not limited to this and may be modified as follows.
(1) The central angle θ2 with respect to the wall 104 is set to 180 °. Thereby, since the opening width of the notch part 105 can be improved, chips can be easily guided from the notch part 105 to the hole part 103, and chip clogging can be suppressed.
(2) An angle at which the crossing angle θ4 exceeds 90 °, preferably 90 ° <θ4 <100 °. As a result, both cutting performance and tool life can be achieved, the thickness of the chip can be reduced, variation in cutting resistance can be reduced, and chatter vibration can also be suppressed.
(3) The bottom blade 106a is formed in a concave bay shape in the front end view in the direction of the axis O. Thereby, since both the inner edge part 106e and the outer periphery corner 106b precede and cut into the cut material, the bottom blade 106a can improve machinability.
(4) The hole 103 is formed so that the inner diameter is enlarged from the front end surface 102a of the cylinder main body 102 to the rear end. Thereby, it is possible to easily discharge the chips guided to the hole portion 103 during the cutting to the rear end side, and chip clogging can be more efficiently prevented.

Explaining the machining situation of the drilling work using the drill apparatus A of the first embodiment described above with reference to FIGS. 1 and 4, a case where the CFRP is drilled as the work material W is shown. A jig 60 fixed along the surface is attached, and the drill device A is set on the jig 60.
The jig 60 is not necessarily limited in structure, but illustrates a supporting cylinder structure having a hollow portion 61, and an insertion in which the drill 101 can be inserted by aligning the axial center of the cylindrical drill 101 with the tip surface thereof. An opening 62 is opened and an intake hole 63 for introducing outside air is opened (see FIG. 4).
Further, a lock edge 65 is provided on the outer periphery of the tip of the jig 60 so that the tip of the second hood 4 protruding from the front of the housing 1 is fitted and locked by a slight rotation.

Thus, the operator holds the handle rod 6 and the operating rod 7, fits the second hood 4 to the tip of the jig 60, and engages the lock edge 65 to set the drill device A on the jig 60. Then, when the start switch 7a attached to the operation rod 7 is turned on, the drilling process is started.
First, when the feed motor 20 is activated, the cylindrical drill 101 advances together with the hollow motor 10 and enters the cavity 61 from the insertion port 62 of the jig 60.
Next, at an appropriate timing, the hollow motor 10 is started and the cylindrical drill 101 is rotated through the single cylinder main shaft 12 with the set number of revolutions. The cylindrical drill 101 is further advanced and the blade portion 106 is moved to the workpiece W. The drilling process, that is, the drilling process, is started upon contact with.

  That is, as shown in FIG. 4, the work material W advances while cutting the outer periphery while leaving the core portion by the rotation of the blade portion 106. Along with the drilling, chips are generated around the blade portion 106, and the chips are generated around the blade portion 106, that is, the tip surface by a strong suction force due to the negative pressure state in the hole 103 by the dust collection mechanism 50. 102a and the notch 105 are reliably sucked into the hole 103, and collected from the hole 103 to the dust collector 50a through the passage 12o of the single cylinder main shaft 12 and the dust collecting hose 51.

Then, the dust collection of the chips continues in the same way until the end of the drilling process. At the end of the processing, the core portion is cut out from the work material W, and the cylindrical portion (shorter than the hole 106) has a smaller diameter. A cutting core P, which is a columnar chip, is formed. The cutting core P is also cut from the hole 103 through the passage 12o and the dust collecting hose 51 together with chips by a strong suction force due to the negative pressure state in the hole 103. It is collected in the dust collector 50a.
Therefore, according to the first embodiment, it is possible to reliably collect the chips and the cutting core that are generated during the drilling process, so that the working environment can be improved. Further, since the hollow main shaft has a single cylinder structure, the outer diameter of the single cylinder main shaft 12 can be reduced, so that the hollow motor 10 can be reduced in size.

Note that the operation settings such as the start timing of the hollow motor 10 and the feed motor 20 are set by the controller 53, and do not necessarily coincide with the description of the processing state, and may be changed as appropriate. In particular, the number of rotations of the hollow motor 10, the feed speed and the feed amount of the feed motor 20 are set in consideration of the material and thickness of the work material W.
In addition, although the case where only one start switch 7a is provided on the operation rod 7 is illustrated, the start switches for the hollow motor 10 and the feed motor 20 are provided separately so that the drilling work progresses according to the judgment of the operator. The combined motors 10 and 20 may be activated in a timely manner.

Next, a second embodiment in which a double cylinder main shaft 12 ′ is adopted as a hollow main shaft of the hand-held drill apparatus A ′ will be described with reference to FIGS.
Since the shape of the cylindrical drill 101, the hollow motor 10, the feed motor 20, and the dust collecting mechanism 50 are the same as those of the first embodiment, the same members are the same in the drawing in order to avoid duplication. A description will be omitted as much as possible with reference numerals.

The double cylinder main shaft 12 'has an integral structure in which an inner cylinder 14 having a plurality of protrusions formed on the outer periphery is inserted and joined to an outer cylinder 15, and a hollow hole in the inner cylinder 14 serves as an inner passage 12a. A gap hole is formed between the cylinder 14 and the outer cylinder 15 as an outer passage 12b.
The double cylinder main shaft 12 'is provided with a collet chuck 16 at the tip, and is attached so that the cylindrical drill 101 can be attached and detached by the chuck 16, and is attached to the air supply mechanism 40 at the rear end via a bifurcated coupler 35'. The air supply hose 41 to be connected and the dust collecting hose 51 to be connected to the dust collecting mechanism 50 described above are connected.

  The first hood 17 that covers the front of the collet chuck 16 is attached to the tip of the hollow motor 10, and the second hood 4 that covers the front of the first hood 17 is attached to the tip of the housing 1, as in the first embodiment. However, the distal end passage 18 formed around the cylindrical drill 101 is communicated with the outer passage 12b of the double cylinder main shaft 12 ′. That is, the collet chuck 16 is provided with a through hole 16a for communicating the outer passage 12b and the tip passage 18 of the double cylinder main shaft 12 '.

  The air supply mechanism 40 includes a compressor 40a that generates compressed air and an air supply hose 41 extending from the compressor 40a. The air supply mechanism 40 supplies the double cylinder main shaft 12 'in the hollow motor 10 from the air supply hose 41, Air is supplied around the blade portion 106 of the cylindrical drill 101 through the outer passage 12b of the main shaft 12 '. The air supply mechanism 40 preferably feeds compressed air through a cooler while cooling the hollow motor 10 and the blade portion 106 of the cylindrical 101 with the cooling air. Thereby, the cutting efficiency of the blade portion is maintained, and the dust collection property is improved by making the chips fine solid.

  The drilling operation using the drill apparatus A ′ is started by setting the drill apparatus A ′ on the jig 60 fixed to the surface of the work material W, as in the first embodiment. In addition to the insertion port 62 into which the cylindrical drill 101 is inserted, a plurality of ventilation holes 64 are formed in the outer periphery of the insertion port 62. Therefore, the compressed air sent to the distal end passage 18 of the first hood 17 through the outer passage 12 b of the double cylinder main shaft 12 ′ is a jig from the distal end passage 18 into the second hood 4 and the vent hole 64. The air is supplied into the 60 hollow portions 61.

Thus, the operator holds the handle rod 6 and the operating rod 7, and fits the second hood 4 to the tip of the jig 60 and engages it with the lock edge 65, whereby the drill device A ′ is attached to the jig 60. Then, drilling is started by turning on the start switch 7a attached to the operation rod 7.
First, when the feed motor 20 is activated, the cylindrical drill 101 advances together with the hollow motor 10 and enters the cavity 61 from the insertion port 62 of the jig 60.
Next, at an appropriate timing, the hollow motor 10 is activated and the cylindrical drill 101 is rotated through the double cylinder main shaft 12 ′ with the set number of rotations, and from the air supply hose 41 of the air supply mechanism 40 to the double cylinder main shaft 12. Compressed air supplied to the outer passage 12b is fed into the cavity 61 through the tip passage 18 and the vent hole 64, and the dust collecting mechanism 50 and the inner passage 12a of the double tube passage 12 ′. The inside of the hole 103 is sucked in via a negative pressure state.

  Further, the cylindrical drill 101 advances, and the blade portion 106 comes into contact with the work material W to drill, that is, the work material W advances while cutting the outer periphery while leaving the core portion by the rotation of the blade portion 106. To do. Along with the drilling, chips are generated around the blade portion 106. The chips are generated by a negative pressure state in the hole 103 by the dust collecting mechanism 50 and a cavity by the compressed air supplied from the air supply mechanism 40. Due to the strong suction force due to the pressure increase in the portion 61, the periphery of the blade portion 106, that is, the hole tip 103 and the notch portion 105 are reliably sucked into the hole portion 103, and the double cylinder main shaft 12 ' The dust is collected into the dust collector 50a through the passage 12a and the dust collecting hose 51.

Then, until the end of the drilling process, the dust collection of the chips continues in the same manner. At the end of the process, the core portion is cut out from the work material W, and the cutting core P is also removed from the compressed air. Similar to the first embodiment, the air is collected from the hole 103 to the dust collector 50a through the inner passage 12a and the dust collecting hose 51 together with the chips by the strong suction force due to the air supply and the negative pressure state in the hole 103. Yes, but more efficiently and reliably recovered.
That is, according to the second embodiment, not only the suction collection function in the dust collection mechanism 50 but also the function of supplying compressed air around the blade portion 106 from the air supply mechanism 40 is added. The suction and recovery function of the chips and the cutting core P is further strengthened, and the working environment during the drilling operation is improved.

  In the above-described embodiment, the case of CFRP as the work material has been described. However, the present invention is not limited to this, and FRP and other fiber-reinforced composite materials may be used, or a cylinder having a high strength blade portion. When using a cylindrical drill, an Al alloy or other metal material may be used. Further, depending on the work material, it is optional to apply to a drilling process in which only a chip is generated without cutting a cutting core.

  In the above-described embodiment, the case where two of the rotation motor (hollow motor) 10 and the feed motor 20 are mounted as the drive source is shown, but this is not always necessary, and the feed motor 20 may be omitted arbitrarily. In addition, the case of a hand-held drill device is illustrated, but the present invention is not limited thereto. Furthermore, in the second embodiment, the case where the outer periphery of the cylindrical drill 101 is covered with the hood members of the first hood 17 and the second hood 4 to form the compressed air supply passage is illustrated. Can be omitted when the is formed on the jig side.

A: Drill device of the first embodiment A ′: Drill device of the second embodiment 10: Hollow motor 11: Motor case 12: Single cylinder spindle 12o: Passage in the single cylinder spindle 12 ′: Double cylinder spindle 12a: Inner Passage 12b: Outer passage 14: Inner cylinder 15: Outer cylinder 16: Collet chuck 20: Feed motor 40: Air supply mechanism 41: Air supply hose 50: Dust collection mechanism 51: Dust collection hose P: Cutting core 101: Cylindrical drill 102 : Cylinder main body 102a: tip surface 102b: outer peripheral surface O: axial center of the cylinder main body 103: hole c: axis of the hole 104: wall 105: notch 106: blade 107: shank

Claims (7)

The main shaft rotated by the drive source is a hollow main shaft, a cylindrical drill having a blade at the tip is attached to the tip of the hollow main shaft via a chuck, a dust collecting mechanism is connected to the rear end of the passage in the hollow main shaft, and the drive By drilling the work material while rotating the cylindrical drill through the hollow main shaft at the source, the generated chips and cutting core are sucked and collected to the dust collecting mechanism through the passage in the hollow main shaft,
The cylindrical drill is rotated around an axis, a cylindrical body, a hole opening in a distal end surface of the cylindrical main body, a wall formed by the hole and the outer peripheral surface of the cylindrical main body, and a wall thereof A notch portion that is notched from the tip surface of the portion and communicates with the hole portion, and a blade portion that is formed or held at a portion where the notch portion intersects the tip surface of the wall portion, and the blade portion has a shaft A bottom blade formed at the tip in the center direction, and an inner side surface that passes through the inner edge of the bottom blade and intersects with the rake face via a ridge line, and the inner side surface defines the inner edge of the bottom blade. A perforating apparatus characterized in that it is inclined in a direction away from a virtual inner cylinder side surface along the axial center with a passing rotation trajectory passing through the axis as it goes in a direction opposite to the rotation of the cylinder body.   2. The perforating apparatus according to claim 1, wherein an axis of the cylinder main body is configured to deviate from an axis of the hole.   The drilling device according to claim 2, wherein the blade portion of the cylindrical drill is formed or held at the thickest portion of the wall portion.   The hollow spindle has a single cylinder structure, the cylindrical drill is attached to the tip of the single cylinder spindle via a chuck, and a dust collecting mechanism is connected to the rear end of the single cylinder spindle. The perforation apparatus according to any one of 1 to 3.   The hollow main shaft has a double cylinder structure including an inner passage and an outer passage, the cylindrical drill is attached to the tip of the double cylinder main shaft via a chuck, and compressed air is fed into the outer passage of the main shaft. Connect the air supply mechanism and connect the dust collecting mechanism to the rear end of the inner passage, and drill the work material while sucking the compressed air sent through the outer passage from the periphery of the drill blade into the inner passage. The drilling device according to any one of claims 1 to 3, wherein the generated chips and cutting core are sucked and collected by the dust collecting mechanism through the inner passage.   6. The perforating apparatus according to claim 4, wherein the drive source is a hollow motor disposed in a housing, and the hollow main shaft is rotatably connected to the rotor.   The drive source is a combination of a hollow motor and a feed motor disposed in a housing. The hollow main shaft is rotatably connected to a rotor of the hollow motor, and the hollow main shaft is moved forward and backward by the feed motor. 6. The drilling device according to claim 4, wherein the cylindrical drill is pitch-fed.

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