Processing apparatus and chip cutting device

Abstract

A chip cutting device 40 has a tool 10 inserted thereinto and cuts chips discharged from the tool 10. The chip cutting device 40 has connected thereto a suction path 16 for suctioning the cut chips.

Description

Processing equipment and chip cutting equipment

[0001] The present disclosure relates to a technique for cutting chips of a workpiece discharged from a rotary tool.

[0002] Patent Document 1 discloses a safety dust collection cover for a drilling press, which includes a main body that forms a work space and a safety cover body arranged on top of the main body. In this safety dust collection cover, a fitting opening for fitting with a work fixing device fixed on a work table is provided on the bottom and side of the main body, and a work insertion opening for inserting a workpiece into the work space of the main body and a discharge opening for suctioning cutting chips are provided on the side of the main body.

[0003] JP 2008-168415 A

[0004] Conventional chip suction devices have a problem in that they suck up long, continuous ribbon-like chips, which means that the suction path is likely to become clogged. To solve this clogging problem, a large suction force is required, and the diameter of the suction path must also be increased, which makes the entire device larger.

[0005] The present disclosure has been made in view of these circumstances, and its purpose is to provide a technique for collecting chips generated during hole drilling.

[0006] One aspect of the present disclosure is a machining device that machines holes in a workpiece, the machine having an opening through which a tool is inserted, and including a chip cutting device that cuts chips discharged from the tool, and a suction path for sucking the cut chips.

[0007] Another aspect of the present disclosure is a chip cutting device that cuts chips discharged from a chip discharge groove of a tool, the device comprising an opening through which the tool is inserted, one or more cutting blades that cut the chips, and a discharge port for sucking the cut chips to the outside.

[0008] Any combination of the above components and conversion of the expressions of the present disclosure into methods, devices, systems, etc. are also valid aspects of the present disclosure.

[0009] 1 is a diagram showing the configuration of a processing device of an embodiment; FIG. 2 is a diagram showing an example of a tool; FIG. 3 is a diagram showing a chip cutting device; FIG. 4 is a diagram showing another chip cutting device; FIG. 5 is a diagram showing another chip cutting device; FIG. 6 is an example of a schematic development view of a tool side blade and a chip cutting blade; FIG. 7 is a diagram for explaining an appropriate guide position; FIG. 8 is another example of a schematic development view of a tool side blade and a chip cutting blade; FIG. 9 is a diagram showing chips discharged from a cutting hole; FIG. 10 is a diagram showing collected chips; FIG. 11 is a diagram showing a modified example of a chip cutting device;

[0010] FIG. 1 shows the configuration of a processing device 1 according to an embodiment. The processing device 1 is a cutting device that drills holes in a workpiece 8. The processing device 1 includes a spindle housing 5 that rotatably holds a spindle 6, and a tool 10 is held in a tool holder 7 attached to the spindle 6. In this embodiment, the tool 10 is a rotary tool, and may be a drill for drilling holes, or a tap for thread cutting. The processing device 1 includes a rotation mechanism 2 that rotates the spindle 6, a movement mechanism 3 that moves the rotation mechanism 2 in a vertical direction, and a control device 4 that controls the rotation of the spindle 6 by the rotation mechanism 2 and the vertical movement of the rotation mechanism 2 by the movement mechanism 3.

[0011] The rotation mechanism 2 has a spindle motor that rotates the spindle 6, and the movement mechanism 3 has a feed motor that moves the spindle housing 5. The rotation mechanism 2 is fixed to the spindle housing 5, and the movement mechanism 3 is connected to the spindle housing 5 to move the spindle housing 5 in the vertical direction. The machining apparatus 1 of the embodiment includes a chip cutting device 40 through which the tool 10 is inserted and which cuts chips discharged from the tool 10.

[0012] FIG. 2 shows an example of a tool 10 for discharging chips. The tool 10 of this embodiment is a drill for drilling a workpiece 8, and includes a drill body 20 and a shank 21. In the example shown in FIG. 2, a portion of the drill body 20 in the axial direction is omitted. An arrow R indicates the rotation direction of the tool 10, and an angle α indicates the helix angle of the chip flute 23, i.e., the helix angle of the tool side cutting edge. The tool 10 shown in FIG. 2 is a right-hand helix drill.

[0013] The tool 10 is attached to the processing device 1 by holding the shank 21 in the tool holder 7. The rotational force of the rotation mechanism 2 is transmitted to the shank 21 via the tool holder 7, and the tool 10 rotates around its axis in the direction indicated by the arrow R (clockwise when viewed from above).

[0014] The drill body 20 includes cutting edges 22 formed at the tip of the drill body 20 and a chip discharge flute 23 that has a rake face 24 at the tip side of the drill body 20 and extends from the rake face 24 toward the rear end of the drill body 20. Two cutting edges 22 are symmetrically provided at the tip of the drill body 20, and two chip discharge flutes 23 are spirally recessed into the outer circumferential surface of the drill body 20 corresponding to these two cutting edges 22. A side cutting edge is formed between the two chip discharge flutes 23. The chip discharge flute 23 constitutes the rake face 24 of the cutting edges 22 at the tip side and has the function of discharging chips generated by the cutting edges 22 from the cut hole to the outside during cutting.

[0015] The flank 25 is provided to reduce the contact area between the tip of the drill body 20 and the workpiece 8 during cutting, thereby suppressing cutting resistance. The cutting edge 22 is formed on the ridge between the flank 25 and the rake face 24.

[0016] During drill cutting, upward curl and lateral curl occur in chips. Upward curl is a curl around an axis parallel to the cutting edge 22 and occurs due to friction between the chip and the rake face, etc. Lateral curl is a curl around a normal to the rake face and occurs mainly due to the difference in speed between the inner and outer diameters of the cutting edge 22. In particular, in the tool 10, the cutting edge 22 extends from approximately the center position to the outer diameter of the drill, so the diameter of the lateral curl roughly matches the diameter of the drill, resulting in strong lateral curl. When upward curl and lateral curl occur in chips, the chips are generated by curling three-dimensionally from the cutting edge 22 and may collide with the inner wall of the chip discharge flute 23 and break apart.

[0017] However, when three-dimensionally curled chips are generated along the chip discharge groove 23, the chips do not collide with the inner wall and are therefore not broken up by the inner wall. Also, if the workpiece material 8 has high ductility, the chips are not easily broken up even when they collide with the inner wall. Furthermore, the chips may not be broken up depending on the feed rate of the tool 10. If the chips are not broken up into small pieces by the inner wall of the chip discharge groove 23 in this way, long chips will be discharged from the cutting hole, which may clog the suction path for sucking up the chips.

[0018] Returning to FIG. 1 , the chip cutting device 40 has an opening through which the tool 10 is inserted. The chip cutting device 40 has a cylindrical housing 66 and a sealed internal space. The chip cutting device 40 has one or more cutting blades in the sealed internal space, and the cutting blades finely cut at least chips discharged from the chip discharge groove 23 of the rotating tool 10 that have not been sufficiently broken into small pieces by the inner wall of the chip discharge groove 23 (referred to as "long chips"). Note that the cutting blades may not cut chips that have already been broken into small pieces by the inner wall of the chip discharge groove 23. The chip cutting device 40 is disposed above the cutting hole, and the cutting blades finely cut the long chips immediately after they are discharged from the cutting hole. The chip cutting device 40 has an outlet 64 for discharging the finely cut chips to the outside, and the outlet 64 is connected to a suction path 16 for sucking the finely cut chips.

[0019] The chip cutting device 40 is supported by a support device 11 attached to the spindle housing 5 and is not fixed to the workpiece 8. The support device 11 includes a rod-shaped member 14 extending in the axial direction, a support member 15 extending horizontally from the lower end of the rod-shaped member 14 and attached to the chip cutting device 40, and a guide member 13 that guides the movement of the rod-shaped member 14. A portion of the rod-shaped member 14 is inserted into a guide hole 13a provided in the guide member 13, and its movement is restricted. Specifically, the guide member 13 allows only axial movement and rotation about the axis of the rod-shaped member 14, and restricts other movements of the rod-shaped member 14. When the tool 10 is inserted into the chip cutting device 40, rotational movement of the rod-shaped member 14 about the axis is restricted.

[0020] The support device 11 further includes a biasing member 12 disposed between the guide member 13 and the support member 15, and in the state shown in Fig. 1, the biasing member 12 applies a force to the support member 15 in a direction pressing it downward. In this embodiment, the biasing member 12 is a coil spring fitted onto the rod-shaped member 14, and by pressing the support member 15 downward with the spring force, a force is applied to the chip cutting device 40 in a direction pressing it against the workpiece 8, and the lower surface of the chip cutting device 40 is brought into close contact with the surface of the workpiece 8. The chip cutting device 40 may be fixed to the support member 15, which is a separate component, or the chip cutting device 40 and the support member 15 may be formed integrally.

[0021] In this embodiment, the suction path 16, which communicates with the discharge port 64 of the chip cutting device 40, is formed inside the support member 15. The suction path 16 may be formed in a member separate from the support member 15. A rubber tube extending to a collection container is attached to the right side of the suction path 16. A suction device (not shown) is connected to the rubber tube, and during cutting, the suction device sucks up chips that have been broken up or cut (crushed) into small pieces before passing through the chip cutting device 40. The sucked chips are then collected in a collection container located at the end of the rubber tube. The suction device is preferably connected to the rubber tube or the suction path 16 near the discharge port 64. Thus, with the processing device 1, hole processing can be performed in a good environment without scattering chips around the processing location.

[0022] The chip cutting device 40 is supported by the support device 11, but the support rigidity is not very high. However, since the tool 10 is inserted into an opening in the center of the chip cutting device 40, the chip cutting device 40 is guided by the tool 10 and placed in a predetermined position. In other words, the chip cutting device 40 is automatically guided by the rotating tool 10 so that its central axis coincides with the center of rotation of the tool 10.

[0023] As described above, the position of the chip cutting device 40 in two horizontal directions and the rotational position around those directions are determined by the tool 10. In this sense, the tool 10 guides the position of the chip cutting device 40, but since the guiding relationship is relative, hereinafter, the parts and structures of the chip cutting device 40 will be referred to as "guide plates," "guide holes," "guide surfaces," etc. that guide the tool 10.

[0024] Fig. 3(a) shows a top view of the chip cutting device 40, and Fig. 3(b) shows a side view of the chip cutting device 40. The chip cutting device 40 has one or more cutting blades 60 that cut long chips discharged from the tool 10. In this example, the chip cutting device 40 has four cutting blades 60 arranged at equal intervals in the circumferential direction.

[0025] The chip cutting device 40 includes an upper first guide plate 50, a lower second guide plate 54, and four ridges 58 protruding from the inner circumferential surface of a cylindrical housing 66 toward the central axis. Adjacent ridges 58 are spaced 90 degrees apart in the circumferential direction. When viewed from the central axis, the inner circumferential surface of each ridge 58 (an arc-shaped surface equidistant from the central axis) forms a guide surface 62 that guides the rotating tool 10. The vertically extending edge at the rear end of the inner circumferential surface, viewed counterclockwise, forms a cutting blade 60. The helix angle of the cutting blade 60 differs from the helix angle α of the side blade of the tool 10, and the difference in the helix angles corresponds to the opening angle of scissors. In the example shown in FIG. 3, the cutting blade 60 is a vertically oriented edge, and therefore the helix angle is zero.

[0026] The first guide plate 50 has a guide hole 52 through which the tool 10 is inserted, and the second guide plate 54 has a guide hole 56 through which the tool 10 is inserted. The first guide plate 50 is positioned on the vertical upper side (spindle side), and the second guide plate 54 is positioned on the vertical lower side (workpiece side). The guide holes 52 and 56 are coaxial and have the same diameter, forming an opening through which the tool 10 is inserted. The diameter of the guide hole is substantially equal to the diameter of the tool 10, and in practice, is slightly larger than the diameter of the tool 10 to ensure smooth rotation of the tool 10. The difference between the guide hole diameter and the tool diameter may be, for example, within 1 mm. By making the guide hole diameter substantially equal to the tool diameter, the chip cutting device 40 is guided by the inner surface of the guide hole (guide surface of the guide hole) and multiple guide surfaces 62 so that the centers of the multiple cutting blades 60 are aligned with the rotation axis of the tool 10. Therefore, the side edge of the tool 10 does not bite into the cutting edge 60, and the tool 10 can rotate stably within the chip cutting device 40.

[0027] When the tool 10 is rotating, the distance between the cutting blade 60 and the side blade of the tool 10 at their closest point is preferably smaller than the thickness of the chips, thereby enabling the cutting blade 60 to efficiently cut long chips discharged from the tool 10. The housing 66 is formed with a discharge port 64 for discharging fine chips that have been split or cut, and a suction path 16 is connected to the discharge port 64, allowing an external suction device to suck the fine chips through the suction path 16. This allows the processing device 1 to discharge only the fine chips to the outside from the discharge port 64, preventing clogging of the suction path 16.

[0028] The chip cutting device 40 has two guide plates, one above the other, which guide the position of the chip cutting device 40 relative to the rotating tool 10, thereby preventing the side blade of the tool 10 from biting into the cutting blade 60.

[0029] When using one guide plate, the height of the chip cutting device can be reduced compared to when using two guide plates, and the length of the rotary tool can be shortened accordingly. When the lower guide plate is eliminated, the chips discharged from the cutting hole can be cut more quickly, but conditions for proper guiding must be met. Below, we will explain the conditions under which the side cutting edge of the tool 10 does not bite into the cutting edge when using one guide plate.

[0030] Fig. 4(a) shows a top view of another chip cutting device 44, and Fig. 4(b) shows a side view of the chip cutting device 44. The chip cutting device 44 has a configuration in which the second guide plate 54, which is the lower plate, is removed from the chip cutting device 40 shown in Fig. 3.

[0031] In the chip cutting device 44, in the upper part where the first guide plate 50 is provided, the guide hole 52 is guided by the tool 10, so the radial position of the cutting blade 60 is determined at a position with an appropriate small clearance with respect to the side blade of the tool 10. However, in the lower part where no guide plate is provided, the cutting blade 60 and the guide surface 62 connected to the cutting blade 60 in the circumferential direction must act as a guide for the side blade of the tool 10 intermittently at multiple rotational positions to prevent the side blade of the tool 10 from biting into (biting into) the cutting blade 60.

[0032] Fig. 5(a) is a perspective view of another chip cutting device 46 as seen from above, and Fig. 5(b) is a perspective view of the chip cutting device 46 as seen from below. The chip cutting device 46 has one or more cutting blades 82 that cut long chips discharged from the tool 10. In this example, the chip cutting device 46 has three cutting blades 82 arranged at equal intervals in the circumferential direction.

[0033] The chip cutting device 46 includes an upper first guide plate 50 and three protrusions 88 that protrude from the inner circumferential surface of the cylindrical housing 66 toward the central axis. Adjacent protrusions 88 are spaced circumferentially at intervals of 120 degrees. When the protrusions 88 are viewed from the central axis, the inner circumferential surfaces of the protrusions 88 (arc-shaped surfaces equidistant from the central axis) form guide surfaces 84 that guide the rotating tool 10, and the edges extending obliquely at the rear ends of the inner circumferential surfaces as viewed counterclockwise form cutting blades 82. The helix angle β of the cutting blades 82 is different from the helix angle α of the side cutting edge of the tool 10, and the orientation of the helix angle β is opposite to that of the helix angle α.

[0034] The first guide plate 50 is disposed on the upper side (spindle side) in the vertical direction and has a guide hole 52 for inserting the tool 10. The guide hole 52 constitutes an opening through which the tool 10 is inserted, and the diameter of the guide hole 52 is substantially equal to the diameter of the tool 10, and is actually slightly larger than the diameter of the tool 10. The difference between the guide hole diameter and the tool diameter may be, for example, within 1 mm.

[0035] When the tool 10 is rotating, the distance between the cutting blade 82 and the side blade of the tool 10 at their closest point is preferably smaller than the thickness of the chips, thereby enabling the cutting blade 82 to efficiently cut long chips discharged from the tool 10. The housing 66 is formed with a discharge port 64 for discharging fine chips that have been broken up or cut, and a suction path 16 is connected to the discharge port 64, allowing an external suction device to suck up the fine chips through the suction path 16. This allows the processing device 1 to discharge only the fine chips to the outside from the discharge port 64, preventing clogging of the suction path 16.

[0036] Below, we will consider conditions for preventing the side cutting edge of the tool 10 from biting (biting or catching) into the chip cutting edge in the lower area where there is no guide plate. Figure 6 is a schematic development of the tool side cutting edge and the chip cutting edge. The horizontal axis indicates the circumferential rotation position, and the vertical axis indicates the height position of the cutting edge 82. Here, the axial height of the cutting edge 82 is designated as L. In the example shown in Figure 6, the tool side cutting edge has a helix angle α (see Figure 2), and the cutting edge 82 formed in the chip cutting device 46 has a reverse helix angle β that is opposite to the helix angle α.

[0037] In this example, the guide surface 84 connected to the cutting blade 82 is an arcuate surface (angle θ) with substantially the same diameter as the cutting blade 82, similar to the guide surface 62 shown in FIG. 4 . Therefore, the guide surface 84 has no clearance angle, and guiding is performed over the entire width (hatched area) of each guide surface 84 and the intersection of the tool-side cutting edge. In FIG. 6 , there are four guide locations surrounded by dashed ellipses. In this schematic diagram, the tool-side cutting edge is likely to bite into the cutting blade 82 at the moment when the lowest point of the cutting blade 82 (the point closest to the workpiece within the axial range of the cutting blade) begins to intersect with the tool-side cutting edge. In this example, the tool-side cutting edge is most likely to bite into the cutting edge 82 at the moment of rotational position π on the horizontal axis.

[0038] The tool side cutting edge is formed along the chip discharge groove 23 (see FIG. 2 ), and therefore twisted in a direction lagging behind the rotation direction from the tip to the base of the tool. In FIG. 6 , the tool side cutting edge is formed with a right-upward twist and moves (rotates) to the left relative to the cutting edge 82 during machining. As described above, the cutting edge 82 has an opposite twist (left-upward twist). In order to prevent the tool side cutting edge from biting into the cutting edge 82, it is necessary for the chip cutting device 46 to be appropriately guided to a predetermined position at the moment when the tool side cutting edge and the cutting edge 82 begin to intersect at the rotation position π.

[0039] Specifically, it is necessary that guiding is performed appropriately at angular positions less than 90 degrees to the left and right of the intersection start position. Here, "guiding appropriately" means guiding the tool side blade in the left and right vicinity of the tool side blade so that the tool side blade does not bite into the cutting blade 82. In the example of FIG. 6, the closest guide point on the left side of the intersection start position is "a", and the closest guide point on the right side of the intersection start position is "b", and it is necessary that guide points a and b are each less than 90 degrees from the intersection start position. Here, the height of guide point a is set to l ａ , the angle from the intersection start position is λ ａ and the height of guide point b is l ｂ , the angle from the intersection start position is λ ｂ Let's say.

[0040] FIG. 7 is a diagram illustrating an appropriate guide position. In FIG. 7, the tool-side cutting edge 80 rotates clockwise and approaches the cutting edge 82 at a rotational position of π. A guide surface 84 is connected to the cutting edge 82. Here, if guide point a is within the range of π / 2 to π and guide point b is within the range of π to 3π / 2, the tool cannot move leftward (i.e., the cutting edge 82 cannot move rightward). Therefore, the tool-side cutting edge 80 does not bite into the cutting edge 82, and the tool inserted in the chip cutting device can continue to rotate stably.

[0041] Hereinafter, the diameter of the guide hole is D, the number of teeth of the side cutting edge of the tool is n, the twist angle of the side cutting edge of the tool is α, the number of teeth of the cutting edge in the chip cutting device is m, the axial height is L, the reverse twist angle (positive when it is opposite to the twist angle of the tool) is β, and the angle of the guide surface is θ. In this case, L > l ａ , l ｂ π / 2 > λ ａ , λ ｂ It is necessary to satisfy the following conditions to avoid a situation in which the tool side cutting edge 80 bites into the cutting edge 82. Therefore, the conditions for preventing biting in order to achieve stable rotation and chip cutting are expressed by the following formulas (1) to (4).

[0042] L>l ａ twist π / 2>λ ａ twist L>l ｂ twist π / 2>λ ｂ twist When all of the conditions of formulas (1) to (4) are satisfied, the tool continues to rotate stably without the tool side cutting edge 80 biting into the cutting edge 82, and the chip cutting device cuts long chips.

[0043] (Condition A) When the following conditions (condition A) are set: D = 8 mm, n = 2, α = 30 deg, m = 3, L = 20 mm, β = 20 deg, θ = 28.6 deg, all of the conditions in equations (1) to (4) are met. A chip-cutting device was created under this condition A and experiments were conducted, confirming that stable rotation and chip-cutting were possible.

[0044] Fig. 8 shows another example of a development view of the tool side blade and the chip cutting blade. The chip cutting device shown in Fig. 8 has two chip cutting blades equally spaced in the circumferential direction, which is different from the chip cutting device shown in Fig. 6.

[0045] (Condition B) Here, when D = 8 mm, n = 2, α = 30 deg, m = 2, L = 20 mm, β = 20 deg, θ = 28.6 deg (Condition B), λ ｂ When a chip cutting device was created under this condition B and an experiment was conducted, it was confirmed that the tool side cutting edge 80 was biting into the cutting edge 82, making it impossible to perform stable rotation.

[0046] In the above-mentioned (Condition A), the guide surface is sufficiently wide that both ends of the guide surface can be considered to have two contact points, thus providing the required six or more support points. However, if the guide surface is narrow or if both the chip cutting blade and the rotating tool have positive clearance angles, there will be an area that does not satisfy the condition of three or more contact points at an angle of less than 180 degrees, and the condition for stable rotation may not be met. In such cases, the six or more contact points can be achieved by increasing the number of teeth, the helix angle, the reverse helix angle, or the axial height of the cutting blade.

[0047] According to the present disclosure, the chip cutting device cuts long chips in an enclosed space immediately after they are discharged from the cutting hole, which makes it possible to finely divide all chips, eliminates the need to cover the area around the cutting hole (i.e., makes it possible to reduce the enclosed space), and increases bulk density.Furthermore, by being able to finely divide all chips, it is not necessary to use a large suction force from the suction device, and the diameter of the suction path can be reduced, making it possible to make the suction device more compact.

[0048] 9 shows an example of chips (aluminum) generated during drilling. Because aluminum has high ductility, the chips are difficult to break up even when they collide with the inner wall of the chip discharge groove 23, and long chips that extend in a spiral shape tend to be generated.

[0049] Figure 10 shows chips collected using the chip cutter of the embodiment. In this experiment, the processing device 1 performed a hole drilling process on an aluminum alloy, and the chips cut into small pieces using the chip cutter were sucked by the suction device and collected in a collection container. When normal processing was performed under the same conditions without using the chip cutter, many long chips such as those shown in Figure 9 were generated, which shows that by using the chip cutter, the chips are cut into very small pieces and their bulk density is increased.

[0050] The present disclosure has been described above based on the embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of the respective components and the respective treatment processes, and that such modifications are also within the scope of the present disclosure.

[0051] In the embodiment, the chip cutting device 40 is formed as a single unit, but it may be formed by combining multiple components. Fig. 11 shows a modified example of the chip cutting device 44. The chip cutting device 44 is composed of a housing part 90 and a cutting part 92, and Fig. 11 shows cross sections of the housing part 90 and the cutting part 92. Note that the discharge port 64 is not shown.

[0052] The housing part 90 may be fixed to the support member 15 and has a guide hole 52. The cutting part 92 has four ridges 58 arranged at equal intervals in the circumferential direction. When the ridges 58 are viewed from the central axis, the inner peripheral surface of the ridges 58 (arc-shaped surfaces equidistant from the central axis) forms a guide surface 62 that guides the rotating tool 10, and the vertically extending edge at the rear end of the inner peripheral surface viewed counterclockwise forms the cutting blade 60. In a modified example, the chip cutting device 44 is formed by fixing the cutting part 92 to the housing part 90. Forming the chip cutting device 44 from two parts has the advantage that, for example, if the cutting blade 60 breaks, it is not necessary to replace the entire chip cutting device 44, but only the cutting part 92. Furthermore, in the chip cutting device 44, the housing part 90 only needs to include a guide plate, while the cutting part 92 does not, which makes it easier to manufacture the cutting part 92.

[0053] An overview of aspects of the present disclosure is as follows: One aspect of the present disclosure is a processing device that processes holes in a workpiece, the processing device having an opening through which a tool is inserted, and including a chip cutting device that cuts chips discharged from the tool, and a suction path for sucking the cut chips.

[0054] According to this aspect, the chip cutting device cuts the chips immediately after they are discharged from the cutting hole, thereby preventing the chips from becoming entangled in the tool, and the suction device can suck up the fine cut chips through the suction path.

[0055] The chip cutting device preferably has a discharge port for discharging the cut chips into the suction path. The processing device preferably includes a support device for supporting the chip cutting device, and the support device preferably has a biasing member for applying a force to the chip cutting device in a direction pressing it against the workpiece.

[0056] The chip cutting device may have one or more cutting blades, the helix angle of which is preferably different from the helix angle of the side cutting edge of the tool, and the sense of the helix angle of the cutting blade may be opposite to the sense of the helix angle of the side cutting edge of the tool.

[0057] The distance between the cutting blade and the side cutting edge of the tool is preferably smaller than the thickness of the chip. The chip cutting device may have a guide surface that guides the rotation of the tool so that the side cutting edge of the tool does not bite into the cutting blade.

[0058] Another aspect of the present disclosure is a chip cutting device that cuts chips discharged from a chip discharge groove of a tool, the device comprising an opening through which the tool is inserted, one or more cutting blades that cut the chips, and a discharge port for sucking the cut chips to the outside.

[0059] According to this embodiment, the chip cutting device cuts the chips immediately after they are discharged from the cutting hole, preventing the chips from becoming entangled around the tool, and the suction device can suck up the cut fine chips through the suction path. The diameter of the opening is preferably slightly larger than the diameter of the tool, and the difference in diameter may be, for example, within 1 mm.

[0060] The present disclosure can be used in cutting devices that use rotary tools such as drills.

[0061] 1... Machining device, 2... Rotation mechanism, 3... Moving mechanism, 4... Control device, 5... Spindle housing, 6... Spindle, 7... Tool holder, 8... Workpiece, 10... Tool, 11... Support device, 12... Pressing member, 13... Guide member, 13a... Guide hole, 14... Rod-shaped member, 15... Support member, 16... Suction path, 20... Drill body, 21... Shank, 22... Cutting edge, 23... Chip discharge groove, 24... Cutting surface, 25...flank surface, 30...chip guide portion, 40, 44, 46...chip cutting device, 50...first guide plate, 52...guide hole, 54...second guide plate, 56...guide hole, 58...protrusion portion, 60...cutting blade, 62...guide surface, 64...discharge outlet, 66...casing, 80...tool side blade, 82...cutting blade, 84...guide surface, 86...discharge outlet, 88...protrusion portion, 90...casing part, 92...cutting part.

Claims

1. A processing device for drilling holes in a workpiece, a chip cutting device having an opening through which a tool is inserted and configured to cut chips discharged from the tool; a suction path for sucking the cut chips, wherein the chip cutting device is not fixed to the workpiece, The chip cutting device is The housing and a plurality of protrusions protruding from the inner circumferential surface of the housing; an edge at a circumferential end of an inner circumferential surface of the protrusion constitutes a cutting blade; The inner peripheral surface of the protrusion portion constitutes a guide surface that guides the rotation of the tool so that the side cutting edge of the tool does not bite into the cutting blade. A processing device characterized by:

2. The chip cutting device has a discharge port for discharging the cut chips into a suction path.

2. The processing device according to claim 1.

3. a support device for supporting the chip cutting device; The support device has a biasing member that applies a force to the chip cutting device in a direction pressing the chip cutting device against the workpiece.

2. The processing device according to claim 1.

4. the helix angle of the cutting edge is different from the helix angle of the side cutting edge of the tool; 2. The processing device according to claim 1.

5. The direction of the helix angle of the cutting edge is opposite to the direction of the helix angle of the side cutting edge of the tool.

5. The processing device according to claim 4.

6. The distance between the cutting edge and the side edge of the tool is smaller than the thickness of the chip.

2. The processing device according to claim 1.

7. The chip cutting device is a guide plate covering the upper part of the housing and having the opening, and a lower part of the housing being pressed against the workpiece to seal the internal space of the housing; The plurality of protrusions are provided in a sealed internal space.

4. The processing device according to claim 3.

8. A chip cutting device that cuts chips discharged from a chip discharge groove of a tool, an opening through which the tool is inserted; The housing and a plurality of protrusions protruding from an inner peripheral surface of the housing; and a discharge port for sucking cut chips to the outside, an edge at a circumferential end of an inner circumferential surface of the protrusion constitutes a cutting blade; The inner peripheral surface of the protrusion portion constitutes a guide surface that guides the rotation of the tool so that the side cutting edge of the tool does not bite into the cutting blade. A chip cutting device characterized by:

9. Further comprising a guide plate covering an upper portion of the housing and having the opening.

9. The chip cutting device according to claim 8.

10. The diameter of the opening is slightly larger than the diameter of the tool.

9. The chip cutting device according to claim 8.