Dressing method for cutting blade
The described cutting blade dressing method addresses the inefficiencies of sharp-edged tips by shaping the blade into a rounded arc through multiple positioning and movement phases, enhancing productivity and reducing chipping and material waste.
Patent Information
- Application Number
- JP2024031442
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-09-11
Smart Images
Figure 2025133469000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a method for dressing a cutting blade. [Background technology]
[0002] 2. Description of the Related Art Cutting machines that use cutting blades are used to separate various plate-shaped workpieces, such as semiconductor wafers, ceramics, resin package substrates, SiC wafers, and sapphire wafers, into individual device chips.
[0003] When cutting a workpiece that is difficult to process with a cutting blade, problems such as wear of the cutting edge of the cutting blade or chipping of the cutting edge, where part of the cutting edge is chipped, may occur. In such cases, it is known to correct the shape by cutting the cutting edge of the cutting blade into the dress board and removing a large amount of it.
[0004] Patent document 1 describes a dressing method called flat dressing, which dresses the tip of the cutting edge of the cutting blade by moving the cutting blade and the dressing board relatively in the axial direction of the spindle that rotates the cutting blade in order to remove a large amount of cutting edge.
[0005] Flat dressing can remove a large amount of the cutting edge of the cutting blade in a short time, but the cutting edge has a flat shape with a sharp edge. However, a circular tip shape with a moderately rounded sharp edge is sometimes preferable for the cutting edge of the cutting blade. It is known that a circular tip shape reduces the cutting resistance when cutting a workpiece compared to a flat shape, and improves the amount and size of chipping that occurs around the groove after cutting the workpiece. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-588 Summary of the Invention [Problem to be solved by the invention]
[0007] Therefore, after flat dressing, pre-cutting is performed to pre-cut a substrate made of the same material as the workpiece, giving the tip of the cutting blade a moderately rounded, arc-shaped tip. However, this poses the problem of poor productivity due to the cost of the pre-cutting substrate and the time required for pre-cutting.
[0008] The present invention provides a method for dressing a cutting blade that efficiently produces a tip shape that is appropriately rounded and arcuate. [Means for solving the problem]
[0009] The present invention provides A method for dressing a cutting blade fixed to a tip of a spindle, comprising: a holding step for holding the dress board on a holding table; a first dressing step in which the cutting blade is positioned at a first height position where the cutting blade cuts into the dressing board by a predetermined distance, and the cutting blade and the dressing board are moved relatively in an axial direction along which the axis of the spindle is aligned while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with a first side surface side, which is one side surface of the cutting blade; After the first dressing step, the cutting blade is positioned at the first height position, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board contacts the second side, which is the other side opposite the first side of the cutting blade. [Effects of the Invention]
[0010] According to the present invention, the tip of the cutting blade can be efficiently shaped into a moderately rounded arc shape. [Brief explanation of the drawings]
[0011] [Figure 1] FIG. 1 is a flowchart showing a flow of an embodiment of a method for dressing a cutting blade 21 according to the present invention. [Figure 2] FIG. 2 is a perspective view of the cutting device 1. As shown in FIG. [Figure 3] FIG. 3 is a perspective view of the annular frame 205 on which the dress board 90 is disposed. [Figure 4] FIG. 4 is a cross-sectional view of the vicinity of the holding table 10 for explaining the holding step S10. [Figure 5] Figure 5(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the first flat dress S11A of the flat dress step S11, and Figure 5(B) is a plan view of the area around the holding table 10 seen from above. [Figure 6] Figure 6(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the first flat dress S11A of the flat dress step S11, and Figure 6(B) is a plan view of the area around the holding table 10 seen from above. [Figure 7] Figure 7(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the second flat dress S11B of the flat dress step S11, and Figure 7(B) is a plan view of the area around the holding table 10 seen from above. [Figure 8] Figure 8(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the second flat dress S11B of the flat dress step S11, and Figure 8(B) is a plan view of the area around the holding table 10 seen from above. [Figure 9] FIG. 9A is a cross-sectional view of the holding table 10 and its surroundings for explaining the start of cutting in the first dressing step S12, and FIG. 9B is a plan view of the holding table 10 and its surroundings seen from above. [Figure 10]FIG. 10(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the end of cutting in the first dressing step S12, and FIG. 10(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 11] FIG. 11(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the start of cutting in the second dressing step S13, and FIG. 11(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 12] FIG. 12(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the end of cutting in the second dressing step S13, and FIG. 12(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 13] FIG. 13 is an explanatory diagram of the shape of the tip of the cutting blade 21 cut in the first dressing step S12 and the second dressing step S13. [Figure 14] FIG. 14(A) is a cross-sectional view of the vicinity of the holding table 10 for explaining the moving step S14, and FIG. 14(B) is a plan view of the vicinity of the holding table 10 as seen from above. [Figure 15] FIG. 15(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the start of cutting in the third dressing step S15, and FIG. 15(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 16] FIG. 16A is a cross-sectional view of the vicinity of the holding table 10 for explaining the end of cutting in the third dressing step S15, and FIG. 16B is a plan view of the vicinity of the holding table 10 as seen from above. [Figure 17] FIG. 17(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the start of cutting in the fourth dressing step S16, and FIG. 17(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 18] FIG. 18(A) is a cross-sectional view of the holding table 10 and its surroundings for explaining the end of cutting in the fourth dressing step S16, and FIG. 18(B) is a plan view of the holding table 10 and its surroundings seen from above. [Figure 19]FIG. 19 is an explanatory diagram of the shape of the tip of the cutting blade 21 cut in the third dressing step S15 and the fourth dressing step S16. [Figure 20] Figure 20(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in a modified example of the third dressing step S15, and Figure 20(B) is a plan view of the area around the holding table 10 seen from above. [Figure 21] Figure 21(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in a modified example of the third dressing step S15, and Figure 21(B) is a plan view of the area around the holding table 10 seen from above. [Figure 22] Figure 22(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in a modified example of the fourth dressing step S16, and Figure 22(B) is a plan view of the area around the holding table 10 seen from above. [Figure 23] Figure 23(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in a modified example of the fourth dressing step S16, and Figure 23(B) is a plan view of the area around the holding table 10 seen from above. DETAILED DESCRIPTION OF THE INVENTION
[0012] Hereinafter, an embodiment of a cutting blade dressing method of the present invention will be described with reference to the drawings.
[0013] FIG. 1 is a flowchart of one embodiment of the dressing method of the present invention. As shown in FIG. 1, the dressing method of this embodiment includes a holding step S10, a flat dressing step S11, a first dressing step S12, a second dressing step S13, a moving step S14, a third dressing step S15, and a fourth dressing step S16. The dressing method of the present invention is sufficient as long as it includes the holding step S10, the first dressing step S12, and the second dressing step S13. The other steps, flat dressing step S11, moving step S14, the third dressing step S15, and the fourth dressing step S16, may be performed as needed. Furthermore, other processes may be performed in addition to the holding step S10, the first dressing step S12, and the second dressing step S13.
[0014] First, a cutting device 1 that can be used in the dressing method of this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a perspective view of the cutting device 1, and Figure 3 is a perspective view of a dressing board 90 that dresses the cutting blade 21 of the cutting device 1.
[0015] The cutting device 1 is a device that cuts (machines) a plate-shaped workpiece 200 and divides the workpiece 200 into individual chips 203. The workpiece 200 is a disk-shaped semiconductor wafer or optical device wafer made of silicon, sapphire, gallium, or the like. The workpiece 200 may also be any of a variety of plate-shaped processing materials, such as a plate-shaped inorganic material substrate made of ceramics, glass, or sapphire, or a plate-shaped ductile material such as metal or resin.
[0016] As shown in FIG. 2, the back surface 204 of the workpiece 200 is attached to a disc-shaped adhesive sheet 206 to which an annular frame 205 is attached, and the workpiece 200 is placed in the opening inside the annular frame 205 .
[0017] The cutting device 1 is a device that holds a workpiece 200, on which a planned division line 202 has been formed, on a holding table 10 and cuts the workpiece 200 with a cutting blade along the planned division line 202. As shown in Fig. 2, the cutting device 1 includes a holding table 10 that holds the workpiece 200 by suction on a holding surface 11, a cutting unit 20 that cuts the workpiece 200 held on the holding table 10 with a cutting blade 21 attached to a spindle 22, and an imaging unit 30 that takes an image of the workpiece 200 held on the holding table 10.
[0018] The cutting device 1 includes an X-axis moving unit 41 that moves the holding table 10 for processing in the X-axis direction parallel to the horizontal direction and the short side direction of the device body 2, a Y-axis moving unit 42 that indexes and moves the cutting unit 20 in the Y-axis direction that is parallel to the horizontal direction and the longitudinal direction of the device body 2 and perpendicular to the X-axis direction, a Z-axis moving unit 43 that moves the cutting unit 20 for cutting in the Z-axis direction that is parallel to the vertical direction that is perpendicular to both the X-axis direction and the Y-axis direction, and a rotational moving unit 44 that rotates the holding table 10 around an axis parallel to the Z-axis direction and is moved for processing in the X-axis direction together with the holding table 10 by the X-axis moving unit 41.
[0019] The holding table 10 is disk-shaped, and the holding surface 11 that holds the workpiece 200 is made of porous ceramic or the like. The holding table 10 is movable by an X-axis movement unit and rotatable by a rotation movement unit 44. The holding table 10 is connected to a vacuum suction source (not shown), and is sucked by the vacuum suction source to suck and hold the workpiece 200. A plurality of clamps 12 that clamp an annular frame 205 are provided around the periphery of the holding table 10.
[0020] The cutting unit 20 includes a spindle 22 on which a cutting blade 21 is attached, which cuts the workpiece 200 held on the holding table 10. The cutting unit 20 is provided so as to be movable in the Y-axis direction by a Y-axis movement unit 42 relative to the workpiece 200 held on the holding table 10, and is also provided so as to be movable in the Z-axis direction by a Z-axis movement unit 43.
[0021] The cutting unit 20 is mounted on a support frame 3 that stands upright from the device main body 2 via a Y-axis moving unit 42, a Z-axis moving unit 43, etc. The cutting unit 20 is capable of positioning the cutting blade 21 at any position on the holding surface 11 of the holding table 10 by the Y-axis moving unit 42 and the Z-axis moving unit 43.
[0022] The cutting unit 20 includes a cutting blade 21, a spindle 22 having the cutting blade 21 attached to the tip thereof, a spindle housing 23 which can be moved in the Y-axis direction and the Z-axis direction by a Y-axis moving unit 42 and a Z-axis moving unit 43 and which accommodates the spindle 22 so that the spindle 22 can rotate freely around the axis S, and a spindle motor (not shown) which is accommodated in the spindle housing 23 and rotates the spindle 22 around the axis S.
[0023] The cutting blade 21 is an extremely thin cutting grindstone having a substantially ring shape, and has a first side surface 21a, which is one side surface in the Y-axis direction, and a second side surface 21b, which is the other side surface opposite the first side surface 21a. The spindle 22 cuts the workpiece 200 by rotating the cutting blade 21. The spindle 22 is housed in a spindle housing 23, which is supported by a Z-axis movement unit 43. The axial center S of the spindle 22 and cutting blade 21 of the cutting unit 20 is set parallel to the Y-axis direction. In other words, if the direction along which the axial center S of the spindle 22 runs is referred to as the axial direction, the axial direction is parallel to the Y-axis direction.
[0024] The X-axis movement unit 41 moves the holding table 10 in the X-axis direction, which is the processing feed direction, to perform processing feed between the holding table 10 and the cutting unit 20 relative to each other along the X-axis. The Y-axis movement unit 42 moves the cutting unit 20 in the Y-axis direction, which is the indexing feed direction, to perform index feed between the holding table 10 and the cutting unit 20 relative to each other along the Y-axis. The Z-axis movement unit 43 moves the cutting unit 20 in the Z-axis direction, which is the cutting feed direction, to perform cutting feed between the holding table 10 and the cutting unit 20 relative to each other along the Z-axis.
[0025] The X-axis moving unit 41, the Y-axis moving unit 42, and the Z-axis moving unit 43 each include a well-known ball screw that is rotatable around its axis, a well-known pulse motor that rotates the ball screw around its axis, and a well-known guide rail that supports the holding table 10 or the cutting unit 20 so that it can move freely in the X-axis, Y-axis, or Z-axis direction.
[0026] The cutting device 1 also includes an X-axis position detection unit (not shown) for detecting the position of the holding table 10 in the X-axis direction, a Y-axis position detection unit (not shown) for detecting the position of the cutting unit 20 in the Y-axis direction, and a Z-axis position detection unit for detecting the position of the cutting unit 20 in the Z-axis direction. The X-axis position detection unit and the Y-axis position detection unit may be configured with a linear scale parallel to the X-axis direction or the Y-axis direction and a read head. The Z-axis position detection unit detects the position of the cutting unit 20 in the Z-axis direction using pulses from a pulse motor. The X-axis position detection unit, the Y-axis position detection unit, and the Z-axis position detection unit output the position of the holding table 10 in the X-axis direction and the position of the cutting unit 20 in the Y-axis direction or the Z-axis direction to the control unit 100. Note that each position is determined by the distance in the X-axis direction, the Y-axis direction, and the Z-axis direction from a preset reference position.
[0027] The cutting device 1 also includes a cassette elevator 50 on which a cassette 51 containing the workpiece 200 before and after cutting is placed and which moves the cassette 51 in the Z-axis direction, and a transport unit (not shown) which moves the workpiece 200 in and out of the cassette 51 and transports the workpiece 200.
[0028] The cassette 51 also accommodates one dressing board 90 shown in FIG. 3. The dressing board 90 is used to dress the cutting blade 21 when the tip of the cutting blade 21 has worn or chipped due to repeated cutting of the workpiece 200, and the shape needs to be corrected. Generally, dressing refers to the process of adjusting the protruding amount of abrasive grains contained in the cutting blade or creating a cutting edge for blunted abrasive grains (dressing), while truing refers to adjusting the shape of the cutting blade (straightening). However, here, the term "dressing" collectively refers to both the functions of adjusting the shape of the tip of the cutting blade and creating a cutting edge for the abrasive grains. Details of dressing will be described later.
[0029] The dressing board 90 is a rectangular plate material made of a resin or ceramic bond material mixed with abrasive grains such as WA (white alundum, alumina-based) or GC (green carbonite, silicon carbide-based). Similar to the workpiece 200, the back surface of the dressing board 90 is attached to an adhesive sheet 206, and the dressing board 90 is placed in the opening inside the annular frame 205.
[0030] The dressing board 90 is supported by an annular frame 205, and when dressing is performed, it is carried out of the cassette 51, and then sucked and held on the holding table 10, and the annular frame 205 is clamped by the clamp unit 12.
[0031] The imaging unit 30 is fixed so as to move integrally with the cutting unit 20. The imaging unit 30 is equipped with an imaging element that captures an image of the area to be divided of the workpiece 200 held on the holding table 10 before cutting. The imaging element is, for example, a CCD (Charge-Coupled Device) imaging element or a CMOS (Complementary MOS) imaging element. The imaging unit 30 captures images of the workpiece 200 and the dress board 90 held on the holding table 10 and outputs the captured images to the control unit 100. Although a detailed explanation will be omitted, the images captured by the imaging unit 30 are used for aligning the workpiece 200 with the cutting unit 20 and aligning the dress board 90 with the cutting unit 20, etc.
[0032] The control unit 100 controls each of the above-mentioned components of the cutting device 1, and causes the cutting device 1 to perform a cutting operation and dressing on the workpiece 200 in accordance with the cutting conditions. The control unit 100 is composed of a computer having an arithmetic processing device having a microprocessor such as a CPU (central processing unit), a storage device having a memory such as a ROM (read only memory) or RAM (random access memory), and an input / output interface device.
[0033] The processing conditions for dressing include, for example, the margin in the X-axis direction, the feed width in the X-axis direction, the cutting depth, and the feed rate in the Y-axis direction. The margin in the X-axis direction is the distance in the X-axis direction from one end 93 of the dress board 90 in the X-axis direction to the dressing start position or dressing end position when dressing is first performed. The feed width in the X-axis direction is the distance in the X-axis direction between the dressing start position and the dressing end position, i.e., the distance when the cutting blade 21 is moved in the X-axis direction relative to the dress board 90 after moving the cutting blade 21 in the Y-axis direction relative to the dress board 90 during dressing.
[0034] The cutting depth is the depth to which the cutting blade 21 cuts into the dress board 90, and is the distance from the top surface of the dress board 90 to the lower end of the cutting blade 21 at the start of dressing. The Y-axis feed speed is the speed at which the cutting blade 21 moves in the Y-axis direction relative to the dress board 90 in the dressing steps S12, S13, S15, and S16 and the flat dress step S11 described below. Note that the processing conditions are not limited to these and may include other conditions. For example, in the flat dress step S11 described below, the processing conditions may also include the number of times the cutting blade 21 moves in the Y-axis direction relative to the dress board 90 in one flat dress.
[0035] Next, one embodiment of the dressing method of the present invention will be described in detail with reference to Figures 1 and 4 to 18. The timing for performing dressing is, for example, every time a preset number of workpieces 200 are cut, and is registered in the control unit 100 as part of the processing conditions.
[0036] First, the holding step S10 will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view of the periphery of the holding table 10 for explaining the holding step S10.
[0037] (holding step) The holding step S10 is a process of placing the dress board 90 on the holding table 10. In the holding step S10, the transport unit is controlled to remove the dress board 90 from the cassette 51, and the dress board 90 is placed on the holding surface 11 of the holding table 10 via the adhesive sheet 206. The control unit 100 controls the vacuum suction source and the like to suction-hold the dress board 90 on the holding surface 11 of the holding table 10 via the adhesive sheet 206, and also clamps the annular frame 205 with the clamp unit 12.
[0038] (Flat Dress Step) Next, the flat dress step S11 will be described with reference to FIGS. As described above, the flat dress step S11 is optionally performed as necessary before the first dress step S12 and the second dress step S13. The flat dress is a process for flattening the tip of the cutting blade 21, and can adjust the shape of the cutting blade 21 before the first dress step S12 and the second dress step S13.
[0039] In the flat dressing step S11, the number of times that the cutting blade 21 is moved in the Y-axis direction relative to the dressing board 90 can be set as appropriate. In this embodiment, the cutting blade 21 is moved in the Y-axis direction relative to the dressing board 90 two times, and the first flat dressing is referred to as the first flat dressing S11A, and the second flat dressing is referred to as the second flat dressing S11B.
[0040] Fig. 5(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting of the first flat dress S11A, and Fig. 5(B) is a plan view of the area around the holding table 10 seen from above. Fig. 6(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting of the first flat dress S11A in the flat dress step S11, and Fig. 6(B) is a plan view of the area around the holding table 10 seen from above.
[0041] As shown in FIGS. 5A and 5B, in the first flat dressing S11A, the cutting blade 21 is positioned outside the dressing board 90 on one end 91 side of the dressing board 90, and positioned at a height position where the cutting blade 21 cuts into the dressing board 90 by a distance Za. Then, while rotating the cutting blade 21, the cutting blade 21 is moved in the Y-axis direction from one end 91 of the dressing board 90 toward the other end 92 at a feed speed Ya, and finally moved to the other end 92 side of the dressing board 90. This dresses the tip of the cutting blade 21 so that the dressing board 90 contacts the first side surface 21a of the cutting blade 21. The distance Za is the aforementioned cutting depth and can be set arbitrarily. The distance Za is, for example, 0.001 to 0.01 mm. The feed speed Ya is relatively high, for example, 10 to 50 mm / sec.
[0042] As a result, the tip of the cutting blade 21 is cut flat as shown in the enlarged broken-line circle in Fig. 6(B). Also, as shown in Fig. 6(A) and (B), a cutting groove 95a extending along the Y-axis direction is formed in the dress board 90.
[0043] Next, the dressing board 90 is moved in the X-axis direction to move the cutting blade 21 away from the cutting groove 95a in the X-axis direction. Note that, in this embodiment, a case is illustrated in which the dressing board 90 is moved in the X-axis direction between the first flat dressing S11A and the second flat dressing S11B to form different cutting grooves 95a, 95b in the dressing board 90 by the first flat dressing S11A and the second flat dressing S11B, but this is not necessarily limited to this. That is, the dressing board 90 may not be moved in the X-axis direction between the first flat dressing S11A and the second flat dressing S11B, and the second flat dressing S11B may be performed so that the cutting groove 95a formed by the first flat dressing S11A becomes deeper.
[0044] Fig. 7(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting of the second flat dress S11B in the flat dress step S11, and Fig. 7(B) is a plan view of the area around the holding table 10 viewed from above. Fig. 8(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting of the second flat dress S11B in the flat dress step S11, and Fig. 8(B) is a plan view of the area around the holding table 10 viewed from above.
[0045] As shown in FIGS. 7A and 7B, in the second flat dressing S11B, the cutting blade 21 is positioned outside the dressing board 90 on the other end 92 side of the dressing board 90, and positioned at a height position where the cutting blade 21 cuts further into the dressing board 90 by a distance Zb. Then, while rotating the cutting blade 21, the cutting blade 21 is moved in the Y-axis direction from the other end 92 of the dressing board 90 toward one end 91 at a feed speed Yb, and finally moved to the one end 91 side of the dressing board 90. This dresses the tip of the cutting blade 21 so that the dressing board 90 contacts the second side surface 21b of the cutting blade 21. The distance Zb is the aforementioned cutting depth and is set arbitrarily. The distance Zb may be the same as or different from the distance Za. The feed speed Yb may be the same as or different from the feed speed Ya.
[0046] As a result, the tip of the cutting blade 21 has a flat shape with an angular end, as shown in an enlarged view within the dashed circle in Fig. 8(B). Also, as shown in Fig. 8(A) and (B), a cutting groove 95b extending along the Y-axis direction is formed in the dress board 90 at a position spaced apart in the X-axis direction from the cutting groove 95a.
[0047] Next, the dress board 90 is moved in the X-axis direction to move the cutting blade 21 away from the cutting groove 95b in the X-axis direction.
[0048] (First dress step) Next, the first dressing step S12 will be described with reference to Figures 9 and 10. The first dressing step S12, together with the second dressing step S13, is a process for forming the tip of the cutting blade 21 into an appropriately rounded arc-shaped tip.
[0049] Fig. 9(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the first dressing step S12, and Fig. 9(B) is a plan view of the area around the holding table 10 seen from above. Fig. 10(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the first dressing step S12, and Fig. 10(B) is a plan view of the area around the holding table 10 seen from above.
[0050] As shown in FIGS. 9A and 9B , in the first dressing step S12, the cutting blade 21 is positioned outside the dress board 90 on one end 91 side of the dress board 90 and positioned at a height position where the cutting blade 21 cuts into the dress board 90 by a distance Zc. The height position of the cutting blade 21 at this time is referred to as a first height position H1. The first height position H1 is the distance from a reference position to the axis S of the spindle 22, which in this embodiment is the distance from the top surface of the holding table 10 to the axis S of the spindle 22. The reference position is not limited to the top surface of the holding table 10, but may be the floor or another position. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from one end 91 to the other end 92 of the dress board 90 at a feed rate Yc, and finally moved to the other end 92 side of the dress board 90. This dresses the tip of the cutting blade 21 so that the dress board 90 contacts the first side surface 21a of the cutting blade 21. The distance Zc is the cutting depth described above and is set arbitrarily taking into consideration the volume to be removed to obtain the desired tip shape. The distance Zc is, for example, 0.01 to 0.03 mm. The feed speed Yc is slower than the feed speeds Ya and Yb in the flat dressing step S11 and is, for example, 1 to 10 mm / sec.
[0051] As a result, the corners of the first side surface 21a of the tip of the cutting blade 21 are cut into an arc shape, as shown in the enlarged broken-line circle in Figure 10(B). Because the feed rate is slower than in the flat dressing step S11, the tip of the cutting blade 21 does not have a flat shape, and the leading side surface in the Y-axis direction (the first side surface 21a in the first dressing step S12) is actively cut, so that the corners of the leading side surface become arc-shaped. Also, as shown in Figures 10(A) and (B), a first groove 95c extending along the Y-axis direction is formed in the dressing board 90.
[0052] Next, the dress board 90 is moved in the X-axis direction to move the cutting blade 21 away from the first groove 95c in the X-axis direction.
[0053] (Second dress step) Next, the second dressing step S13 will be described with reference to FIGS.
[0054] Fig. 11(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the second dressing step S13, and Fig. 11(B) is a plan view of the area around the holding table 10 seen from above. Fig. 12(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the second dressing step S13, and Fig. 12(B) is a plan view of the area around the holding table 10 seen from above.
[0055] 11A and 11B, in the second dressing step S13, the cutting blade 21 is positioned outside the dressing board 90 on the other end 92 side of the dressing board 90, and is positioned at a first height position H1 where the cutting blade 21 cuts into the dressing board 90 by a distance Zc. That is, the cutting blade 21 is maintained at the same first height position H1 as in the first dressing step S12. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from the other end 92 of the dressing board 90 toward one end 91 at the same feed speed Yc as in the first dressing step S12, and finally moved to the one end 91 side of the dressing board 90. This dresses the tip of the cutting blade 21 so that the dressing board 90 contacts the second side surface 21b of the cutting blade 21.
[0056] As a result, the corner of the second side surface 21b of the tip of the cutting blade 21 is cut into an arc shape, as shown in the enlarged broken-line circle in Figure 12(B). In the second dressing step S13, the feed rate is slower than in the flat dressing step S11, so the tip of the cutting blade 21 does not have a flat shape, and the leading side surface in the Y-axis direction (the second side surface 21b in the second dressing step S13) is actively cut, resulting in the leading side surface having an arc shape. Also, as shown in Figures 12(A) and (B), a second groove 95d extending along the Y-axis direction is formed in the dressing board 90.
[0057] Here, the shape of the tip of the cutting blade 21 cut in the first dressing step S12 and the second dressing step S13 will be described in more detail with reference to Fig. 13. Fig. 13 is an explanatory diagram of the shape of the tip of the cutting blade 21 cut in the first dressing step S12 and the second dressing step S13.
[0058] The volume removed from the tip of the cutting blade 21 cut in the first dressing step S12 and the second dressing step S13 depends mainly on the material of the cutting blade 21, the material of the dressing board 90, the depth of cut (distance Zc), and the feed rate in the Y-axis direction (feed rate Yc). Once the materials of the cutting blade 21 and the dressing board 90 are determined, the depth of cut (distance Zc) determines the shape change start point P, which is the upper limit of the cutting on the side of the cutting blade 21, and the feed rate in the Y-axis direction (feed rate Yc) determines the volume removed from the shape change start point P. If the volume removed in the first dressing step S12 is small, cutting will not be possible up to the center line L of the cross section of the cutting blade 21, leaving a region where new abrasive grains are not exposed, as shown in (D1-a) in Figure 13. Therefore, the feed rate in the Y-axis direction (feed rate Yc) is increased to cut up to the cross-sectional center line L of the cutting blade 21 as shown in (D1-b) of Figure 13, or cut beyond the cross-sectional center line L of the cutting blade 21 as shown in (D1-c) of Figure 13.
[0059] In the second dressing step S13, the cutting blade 21 is maintained at the same first height position H1 as in the first dressing step S12 to align the shape change start point P with that in the first dressing step S12, as described above. Furthermore, to align the removal volumes, the Y-axis feed rate is also maintained at the same Y-axis feed rate (feed rate Yc). In the first dressing step S12, the first side surface 21a of the cutting blade 21 is cut to the cross-sectional center line L of the cutting blade 21 as shown in (D1-b) of FIG. 13, and then the second side surface 21b is cut to the cross-sectional center line L of the cutting blade 21 as shown in (D2-b) of FIG. If the removal volumes on the first side surface 21a and the second side surface 21b are equal and the tip center Q, which is the center of the tip of the cutting blade 21 in the Y-axis direction, coincides with the cross-sectional center line L, the process ends in the second dressing step S13.
[0060] On the other hand, if the first side surface 21a of the cutting blade 21 is cut beyond the cross-sectional centerline L of the cutting blade 21 in the first dressing step S12 as shown in (D1-c) of FIG. 13 and then the second side surface 21b is cut, the removed volumes on the first side surface 21a and the second side surface 21b are not equal, as shown in (D2-c) of FIG. 13, and the tip center Q of the cutting blade 21 is shifted from the cross-sectional centerline L. Generally, it is difficult to accurately control the cutting up to the cross-sectional centerline L of the cutting blade 21 as shown in (D1-b) of FIG. 13 in the first dressing step S12. Therefore, to allow for a margin, cutting beyond the cross-sectional centerline L of the cutting blade 21 is performed as shown in (D1-c) of FIG. 13. In such a case, the movement step S14, the third dressing step S15, and the fourth dressing step S16 are performed to equalize the removed volumes on the first side surface 21a and the second side surface 21b and to align the tip center Q, which is the center of the tip of the cutting blade 21 in the Y-axis direction, with the cross-sectional centerline L.
[0061] (Movement step) Next, the movement step S14 will be described with reference to FIG.
[0062] Fig. 14(A) is a cross-sectional view of the periphery of the holding table 10 for explaining the movement step S14, and Fig. 14(B) is a plan view of the periphery of the holding table 10 viewed from above. Note that Fig. 14(A) and (B) show the cutting blade 21 before and after movement in one drawing.
[0063] The movement step S14 is a process performed after the second dressing step S13 and before the third dressing step S15, in which the cutting unit 20 is moved to change the leading side of the dress board 90 from the first side 21a to the second side 21b in the third dressing step S15. Specifically, as shown in FIGS. 14A and 14B, in the movement step S14, the cutting blade 21 is not dressed, and the cutting blade 21 is moved from one end 91 of the dress board 90 to the other end 92 of the dress board 90 while floating above the dress board 90. At this time, the dress board 90 is not moved in the X-axis direction. That is, the cutting unit 20 passes above the second groove 95d formed in the second dressing step S13.
[0064] (Third dress step) Next, the third dressing step S15 will be described with reference to Figures 15 and 16. The third dressing step S15, together with the fourth dressing step S16, is a process for aligning the tip center Q of the cutting blade 21, which was shifted in the first dressing step S12 and the second dressing step S13, with the cross-sectional center line L and for forming the tip of the cutting blade 21 into an appropriately rounded, arc-shaped tip shape.
[0065] Fig. 15(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the third dressing step S15, and Fig. 15(B) is a plan view of the area around the holding table 10 seen from above. Fig. 16(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the third dressing step S15, and Fig. 16(B) is a plan view of the area around the holding table 10 seen from above.
[0066] As shown in Figures 15A and 15B, in the third dressing step S15, the cutting blade 21 is positioned outside the dress board 90 on the other end 92 side of the dress board 90, and is positioned at a second height position H2 lower than the first height position H1. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from the other end 92 of the dress board 90 toward one end 91 at a feed speed Yc, and finally moved to the one end 91 side of the dress board 90. At this time, the cutting blade 21 is moved along the second groove 95d formed in the second dressing step S13 so as to overlap the second groove 95d. This dresses the tip of the cutting blade 21 so that the dress board 90 contacts the second side surface 21b of the cutting blade 21.
[0067] As a result, the corners of the second side surface 21b are cut into an arc shape at the tip of the cutting blade 21, as shown enlarged in the dashed circle in Fig. 16(B). Also, as shown in Fig. 16(A) and (B), the depth of the second groove 95d formed in the dress board 90 becomes deeper.
[0068] Next, the dress board 90 is moved in the X-axis direction. More specifically, the dress board 90 is moved in the X-axis direction so that the axis S of the cutting blade 21 is aligned with the first groove 95c.
[0069] (4th dress step) Next, the fourth dressing step S16 will be described with reference to FIGS.
[0070] Fig. 17(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in the fourth dressing step S16, and Fig. 17(B) is a plan view of the area around the holding table 10 seen from above. Fig. 18(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in the fourth dressing step S16, and Fig. 18(B) is a plan view of the area around the holding table 10 seen from above.
[0071] As shown in FIGS. 17A and 17B, in the fourth dressing step S16, the cutting blade 21 is positioned outside the dressing board 90 on one end 91 side of the dressing board 90, and is positioned at a second height position H2 lower than the first height position H1. That is, the cutting blade 21 is maintained at the second height position H2, the same as in the third dressing step S15. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from one end 91 to the other end 92 of the dressing board 90 at a feed rate Yc, and finally moved to the other end 92 side of the dressing board 90. At this time, the cutting blade 21 is moved along the first groove 95c formed in the first dressing step S12 so as to overlap the first groove 95c. This dresses the tip of the cutting blade 21 so that the dressing board 90 contacts the first side surface 21a of the cutting blade 21.
[0072] As a result, the corners of the first side surface 21a are cut into an arc shape at the tip of the cutting blade 21, as shown enlarged in the dashed circle in Fig. 18(B). Also, as shown in Fig. 18(A) and (B), the depth of the first groove 95c formed in the dress board 90 becomes deeper.
[0073] Here, the shape of the tip of the cutting blade 21 cut in the third dressing step S15 and the fourth dressing step S16 will be described in more detail with reference to Fig. 19. Fig. 19 is an explanatory diagram of the shape of the tip of the cutting blade 21 cut in the third dressing step S15 and the fourth dressing step S16.
[0074] If the tip center Q of the cutting blade 21 deviates from the cross-sectional center line L after the second dressing step S13, there will be a difference between the volume removed in the first dressing step S12 and the volume removed in the second dressing step S13. Because the cutting of the cutting blade 21 in the first dressing step S12 and the second dressing step S13 is performed on the dressing board 90, the difference in the volume removed in the cutting blade 21 will appear in a groove formed in the dressing board 90. For example, if the tip shape of the cutting blade 21 is as shown in (D2-c) of FIG. 13 , the volume removed in the first dressing step S12 will be greater than the volume removed in the second dressing step S13. In this case, the depth of the first groove 95c formed by contact and wear against the first side surface 21a of the cutting blade 21 in the first dressing step S12 will be deeper than the depth of the second groove 95d formed by contact and wear against the second side surface 21b of the cutting blade 21 in the second dressing step S13.
[0075] Therefore, the groove that contacts the second side surface 21b in the third dressing step S15 is defined as a second groove 95d formed by contact with the second side surface 21b of the cutting blade 21 and abrasion in the second dressing step S13, and the groove that contacts the first side surface 21a in the fourth dressing step S16 is defined as a first groove 95c formed by contact with the first side surface 21a of the cutting blade 21 and abrasion in the first dressing step S12. That is, in the third dressing step S15, the second side surface 21b side, where a larger removal volume is desired, is cut with the shallow second groove 95d, and in the fourth dressing step S16, the first side surface 21a side, where a smaller removal volume is sufficient, is cut with the deep first groove 95c. This makes it possible to match the removal volume on the first side surface 21a side cut in the first dressing step S12 and the fourth dressing step S16 with the removal volume on the side cut in the second dressing step S13 and the third dressing step S15. Therefore, as shown enlarged within the dashed circle in (B) of Figure 18, the tip of the cutting blade 21 that has undergone the fourth dressing step S16 theoretically has equal removal volumes on the first side 21a side and the second side 21b side, and the tip center Q, which is the center of the tip of the cutting blade 21 in the Y-axis direction, coincides with the cross-sectional center line L.
[0076] As described above, in the dressing method of this embodiment, in the first dressing step S12, the cutting blade 21 and the dressing board 90 are moved relative to each other in the Y-axis direction while rotating the cutting blade 21, dressing the tip of the cutting blade 21 so that the dressing board 90 contacts the first side surface 21a of the cutting blade 21. In the second dressing step S13, the cutting blade 21 and the dressing board 90 are moved relative to each other in the Y-axis direction while rotating the cutting blade 21, dressing the tip of the cutting blade 21 so that the dressing board 90 contacts the second side surface 21b of the cutting blade 21. By maintaining the same height position of the cutting blade 21 in the first dressing step S12 and the second dressing step S13, the tip of the cutting blade 21 can be shaped into a moderately rounded arc. This reduces the time and man-hours required for conventional precutting and improves the productivity of the workpiece.
[0077] Furthermore, even if the tip of the cutting blade 21 cannot be shaped into the desired shape in the first dressing step S12 and the second dressing step S13, in the third dressing step S15, the cutting blade 21 and the dressing board 90 are moved relatively in the Y-axis direction while rotating the cutting blade 21, and the tip of the cutting blade 21 is dressed so that the dressing board 90 contacts the second side surface 21b of the cutting blade 21. In the fourth dressing step S16, the cutting blade 21 and the dressing board 90 are moved relatively in the Y-axis direction while rotating the cutting blade 21, and the tip of the cutting blade is dressed so that the dressing board 90 contacts the first side surface 21a of the cutting blade 21. At this time, by making the height position of the cutting blade 21 the same in the third dressing step S15 and the fourth dressing step S16, which is lower than the height position in the first dressing step S12 and the second dressing step S13, the tip of the cutting blade 21 can be shaped into an appropriately rounded arc.
[0078] In addition, in the movement step S14 after the second dressing step S13 and before the third dressing step S15, the cutting blade 21 is moved from one end 91 of the dressing board 90 to the other end 92 of the dressing board 90 without dressing the cutting blade 21 with the dressing board 90, thereby changing the side of the cutting blade 21 that is preceding the dressing board 90.
[0079] In addition, the third dressing step S15 dresses the cutting blade 21 along the second groove 95d formed in the second dressing step S13 and so that it overlaps the second groove 95d, and the fourth dressing step S16 dresses the cutting blade 21 along the first groove 95c formed in the first dressing step S12 and so that it overlaps the first groove 95c, thereby making it possible to match the removal volume on the first side surface 21a side removed in the first dressing step S12 and the fourth dressing step S16 with the removal volume on the second side surface 21b side removed in the second dressing step S13 and the third dressing step S15.
[0080] However, it is not necessary to use the grooves already formed in the dressing board 90 in the third dressing step S15 and the fourth dressing step S16. Modified examples of the third dressing step S15 and the fourth dressing step S16 will be described below with reference to Figures 20 to 23.
[0081] (Third dressing step (variant)) A modification of the third dressing step S15 will be described with reference to FIGS.
[0082] Fig. 20(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in a modified example of the third dressing step S15, and Fig. 20(B) is a plan view of the area around the holding table 10 viewed from above. Fig. 21(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in a modified example of the third dressing step S15, and Fig. 21(B) is a plan view of the area around the holding table 10 viewed from above.
[0083] In a modification of the third dressing step S15, the dressing board 90 is moved in the X-axis direction before and after the moving step S14 to move the cutting blade 21 away from the cutting grooves 95a to 95d in the X-axis direction.
[0084] 20(A) and 20(B), in the third dressing step S15, the cutting blade 21 is positioned outside the dress board 90 on the other end 92 side of the dress board 90, and is positioned at a second height position H2 lower than the first height position H1. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from the other end 92 of the dress board 90 toward one end 91 at a feed speed Yc, and finally moved to the one end 91 side of the dress board 90. This dresses the tip of the cutting blade 21 so that the dress board 90 comes into contact with the second side surface 21b of the cutting blade 21.
[0085] As a result, the tip of the cutting blade 21 cuts the corner of the first side surface 21a into an arc shape, as shown in an enlarged view within the dashed circle in Figure 21(B). Also, a cutting groove 95e extending along the Y-axis direction is formed in the dressing board 90. Next, the dressing board 90 is moved in the X-axis direction, and the cutting blade 21 is moved away from the cutting grooves 95a-95e in the X-axis direction.
[0086] (Fourth dressing step (variant)) Next, a modified example of the fourth dressing step S16 will be described with reference to FIGS.
[0087] Fig. 22(A) is a cross-sectional view of the area around the holding table 10 to explain the start of cutting in a modified example of the fourth dressing step S16, and Fig. 22(B) is a plan view of the area around the holding table 10 viewed from above. Fig. 23(A) is a cross-sectional view of the area around the holding table 10 to explain the end of cutting in a modified example of the fourth dressing step S16, and Fig. 23(B) is a plan view of the area around the holding table 10 viewed from above.
[0088] In a modification of the fourth dressing step S16, the dressing board 90 is moved in the X-axis direction after the third dressing step S15, and the cutting blade 21 is separated in the X-axis direction from the cutting grooves 95a to 95e.
[0089] 22A and 22B, in the fourth dressing step S16, the cutting blade 21 is positioned outside the dressing board 90 on one end 91 side of the dressing board 90, and is positioned at a second height position H2 lower than the first height position H1. That is, the cutting blade 21 is maintained at the second height position H2, the same as in the third dressing step S15. Then, while rotating, the cutting blade 21 is moved in the Y-axis direction from one end 91 to the other end 92 of the dressing board 90 at a feed rate Yc, and finally moved to the other end 92 side of the dressing board 90. This dresses the tip of the cutting blade 21 so that the dressing board 90 contacts the second side surface 21b of the cutting blade 21.
[0090] As a result, the corner of the second side surface 21b is cut into an arc shape at the tip of the cutting blade 21, as shown in an enlarged view within the dashed circle in Figure 23(B). Also, a cutting groove 95f extending along the Y-axis direction is formed in the dress board 90.
[0091] In the above embodiment, the difference in depth between the already formed first groove 95c and second groove 95d was used to match the removal volume on the first side surface 21a cut in the first dressing step S12 and the fourth dressing step S16 with the removal volume on the side cut in the second dressing step S13 and the third dressing step S15. However, in this modified example, because cutting is performed using the flat surface of the dressing board 90, it is necessary to adjust the Y-axis feed speed so that the removal volume on the second side surface 21b cut in the third dressing step S15 is larger than the removal volume on the first side surface 21a cut in the fourth dressing step S16. That is, in the third dressing step S15, the removal volume on the second side surface 21b side is desired to be large, so the Y-axis feed speed is set relatively fast. On the other hand, in the fourth dressing step S16, the removal volume on the first side surface 21a side does not need to be large, so the Y-axis feed speed is set relatively slow. This allows the removal volume on the first side surface 21a side cut in the first dressing step S12 and the fourth dressing step S16 to be matched with the removal volume on the side cut in the second dressing step S13 and the third dressing step S15.
[0092] Furthermore, the tip shape of the cutting blade 21 before the first dressing step S12 can also affect the removal volume in the first dressing step S12 and the second dressing step S13. Therefore, by performing the flat dressing step S11 before the first dressing step S12, the first dressing step S12 and the second dressing step S13 can be performed with the tip shape of the cutting blade 21 in a flat state, thereby forming a tip shape of more stable quality.
[0093] The speed at which the cutting blade 21 and the dressing board 90 are moved relative to each other in the first dressing step S12 and the second dressing step S13 is slower than the speed at which the cutting blade 21 and the dressing board 90 are moved relative to each other in the flat dressing step S11. This allows the tip of the cutting blade 21 to have an appropriately rounded arc shape in the first dressing step S12 and the second dressing step S13.
[0094] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above-described embodiments may be combined in any manner without departing from the spirit of the invention.
[0095] For example, while the cutting device 1 that can be used with the dressing method of this embodiment has been described with reference to Figures 2 and 3, the configuration of the cutting device is not limited to this, and any configuration can be adopted as long as it is capable of performing the holding step S10, the first dressing step S12, and the second dressing step S13.
[0096] In addition, in the first dressing step S12, the cutting blade 21 is positioned outside the dress board 90 on one end 91 side of the dress board 90, and the cutting blade 21 is positioned at a height position where it cuts into the dress board 90 by a distance Zc, and in the second dressing step S13, the cutting blade 21 is positioned outside the dress board 90 on the other end 92 side of the dress board 90, and the cutting blade 21 is positioned at a first height position H1 where it cuts into the dress board 90 by a distance Zc, but this is not necessarily limited to this. That is, in the first dressing step S12, the cutting blade 21 may be positioned inside the dress board 90 on one end 91 side of the dress board 90, and the cutting blade 21 may be positioned by cutting like a chopper cut at a height position where it cuts into the dress board 90 by a distance Zc; in the second dressing step S13, the cutting blade 21 may be positioned inside the dress board 90 on the other end 92 side of the dress board 90, and the cutting blade 21 may be positioned by cutting like a chopper cut at a first height position H1 where it cuts into the dress board 90 by a distance Zc.
[0097] This specification describes at least the following items. Note that the components in parentheses correspond to those in the above-described embodiment, but are not limited to these.
[0098] (1) A method for dressing a cutting blade (cutting blade 21) fixed to the tip of a spindle (spindle 22), comprising: a holding step (holding step S10) of holding the dress board (dress board 90) on a holding table (holding table 10); a first dressing step (first dressing step S12) in which the cutting blade is positioned at a first height position (first height position H1) where the cutting blade cuts into the dressing board by a predetermined distance (distance Zc), and the cutting blade and the dressing board are moved relatively in the axial direction (Y-axis direction) along which the axis (axis S) of the spindle is aligned while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board contacts the first side surface (first side surface 21a) side, which is one side surface of the cutting blade; and a second dressing step (second dressing step S13) in which, after the first dressing step, the cutting blade is positioned at the first height position, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board contacts the second side surface (second side surface 21b) of the cutting blade, which is the other side surface opposite to the first side surface. How to dress.
[0099] According to (1), by dressing the side of the cutting blade at the same height position in the first dressing step and the second dressing step, the cutting blade tip shape can be made into a moderately rounded arc shape in a short time. This saves the time and man-hours required for conventional precutting and improves the productivity of the workpiece.
[0100] (2) The dressing method according to (1), a third dressing step (third dressing step S15) in which, after the second dressing step, the cutting blade is positioned at a second height position (second height position H2) lower than the first height position, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with the second side surface of the cutting blade; and a fourth dressing step (fourth dressing step S16) in which, after the third dressing step, the cutting blade is positioned at the second height position, the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, and the tip of the cutting blade is dressed so that the dressing board comes into contact with the first side surface side of the cutting blade. How to dress.
[0101] According to (2), by performing the third and fourth dressing steps in addition to the first and second dressing steps, the tip shape of the cutting blade can be more reliably made into a moderately rounded arc shape.
[0102] (3) The dressing method according to (1) or (2), The dress board is rectangular, The first dressing step positions the cutting blade on the outer side of the dress board at one end side of the dress board, and dresses the tip of the cutting blade from the one end side of the dress board toward the other end side of the dress board, The second dressing step positions the cutting blade outside the dress board on the other end side of the dress board and dresses the tip of the cutting blade from the other end side toward the one end side of the dress board. How to dress.
[0103] According to (3), the first dressing step and the second dressing step can be efficiently performed using a rectangular dressing board.
[0104] (4) The dressing method according to (3), The cutting blade may be further provided with a moving step (moving step S14) of moving the cutting blade from the one end side of the dress board to the outside of the dress board on the other end side without dressing the cutting blade with the dress board after the second dressing step and before the third dressing step. How to dress.
[0105] According to (4), by performing the movement step, the side of the cutting blade leading to the dressing board can be changed between the first dressing step and the third dressing step, and the cutting blade can be dressed in a balanced manner.
[0106] (5) The dressing method according to (1), further comprising a flat dress step after the holding step and before the first dress step; The flat dress step includes: a first flat dresser (first flat dresser S11A) that positions the cutting blade at a height position where the cutting blade cuts into the dressing board by a predetermined distance, moves the cutting blade and the dressing board relatively in the axial direction while rotating the cutting blade, and dresses the tip of the cutting blade so that the dressing board comes into contact with the first side surface of the cutting blade; and a second flat dressing (second flat dressing S11B) in which the cutting blade is positioned at a height position lower than the cutting height position of the first flat dressing, the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, and the tip of the cutting blade is dressed so that the dressing board comes into contact with the second side surface side of the cutting blade at least once. How to dress.
[0107] According to (5), the flat dressing step allows the first and second dressing steps to be performed from a state in which the tip shape of the cutting blade is flat, thereby forming a tip shape of more stable quality.
[0108] (6) The dressing method according to (5), In the first flat dress and the second flat dress, the speed (feed speed Yc) when the cutting blade and the dress board are moved relatively is slower than the speed (feed speeds Ya, Yb) when the cutting blade and the dress board are moved relatively in the first dressing step and the second dressing step. How to dress.
[0109] According to (6), in the flat dressing step, the cutting blade is moved quickly to make the tip shape flat, and in the dressing step, the cutting blade is moved slower than in the flat dressing step to make the tip shape of the cutting blade a moderately rounded arc.
[0110] (7) The dressing method according to (2), If the groove of the dressing board formed in the first dressing step is referred to as the first groove (first groove 95c), and the groove of the dressing board formed in the second dressing step is referred to as the second groove (second groove 95d), the third dressing step dresses the cutting blade along the second groove and so as to overlap the second groove; the fourth dressing step dresses the cutting blade along the first groove and so as to overlap the first groove; How to dress.
[0111] According to (7), for example, when the removal volume in the first dressing step is large and the removal volume in the second dressing step is small, the third dressing step can be dressed using the second groove formed in the second dressing step, and the fourth dressing step can be dressed using the first groove formed in the first dressing step, thereby making the removal volume on the first side surface side removed in the first dressing step and the fourth dressing step and the removal volume on the second side surface side removed in the second dressing step and the third dressing step as close as possible to each other.
[0112] (8) The dressing method according to (1) or (2), In the first dressing step and the second dressing step, the speed (feed speed Yc) when moving the cutting blade and the dressing board relative to each other is equal. How to dress.
[0113] According to (8), the difference in the removal volume between the first flat dress and the second flat dress can be suppressed on both sides of the cutting blade.
[0114] (9) The dressing method according to (8), The speed (feed speed Yc) when the cutting blade and the dressing board are moved relative to each other in the first dressing step and the second dressing step is 10 mm / sec or less. How to dress.
[0115] According to (9), the tip of the cutting blade can be formed into a moderately rounded arc shape. [Explanation of symbols]
[0116] 10 Holding table 21 Cutting blade 21a 1st side 21b Second side 22 Spindle 90 Dress Board 95c 1st groove 95d 2nd groove S axis center S10 Hold step S11A 1st Flat Dress S11B 2nd Flat Dress S12 First dress step S13 2nd dress step S14 Movement step S15 3rd Dress Step S16 4th Dress Step Zc distance (predetermined distance) Ya feed rate Yb Feed rate Yc feed rate
Claims
1. A method for dressing a cutting blade fixed to a tip of a spindle, comprising: a holding step for holding the dress board on a holding table; a first dressing step in which the cutting blade is positioned at a first height position where the cutting blade cuts into the dressing board by a predetermined distance, and the cutting blade and the dressing board are moved relatively in an axial direction along which the axis of the spindle is aligned while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with a first side surface side, which is one side surface of the cutting blade; and a second dressing step in which, after the first dressing step, the cutting blade is positioned at the first height position, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with the second side surface of the cutting blade, which is the other side surface opposite to the first side surface. How to dress.
2. The dressing method according to claim 1, a third dressing step in which, after the second dressing step, the cutting blade is positioned at a second height position lower than the first height position, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with the second side surface of the cutting blade; and a fourth dressing step of, after the third dressing step, moving the cutting blade and the dressing board relatively in the axial direction while rotating the cutting blade with the cutting blade positioned at the second height position, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with the first side surface of the cutting blade. How to dress.
3. The dressing method according to claim 1 or 2, The dress board is rectangular, The first dressing step positions the cutting blade on the outer side of the dress board at one end side of the dress board, and dresses the tip of the cutting blade from the one end side of the dress board toward the other end side of the dress board, the second dressing step positions the cutting blade outside the dress board on the other end side of the dress board and dresses the tip of the cutting blade from the other end side toward the one end side of the dress board; How to dress.
4. The dressing method according to claim 3, a moving step of moving the cutting blade from the one end side of the dress board to the outside of the dress board on the other end side without dressing the cutting blade with the dress board after the second dressing step and before the third dressing step, How to dress.
5. The dressing method according to claim 1, further comprising a flat dressing step after the holding step and before the first dressing step; The flat dress step includes: a first flat dressing step in which the cutting blade is positioned at a height where the cutting blade cuts into the dressing board by a predetermined distance, and the cutting blade and the dressing board are moved relatively in the axial direction while rotating the cutting blade, thereby dressing the tip of the cutting blade so that the dressing board comes into contact with the first side surface of the cutting blade; and a second flat dressing step of positioning the cutting blade at a height position lower than the cutting height position of the first flat dressing, relatively moving the cutting blade and the dressing board in the axial direction while rotating the cutting blade, and dressing the tip of the cutting blade so that the dressing board comes into contact with the second side surface of the cutting blade at least once. How to dress.
6. The dressing method according to claim 5, a speed at which the cutting blade and the dressing board are moved relative to each other in the first dressing step and the second dressing step is slower than a speed at which the cutting blade and the dressing board are moved relative to each other in the first flat dressing and the second flat dressing; How to dress.
7. The dressing method according to claim 2, If the groove of the dress board formed in the first dressing step is referred to as the first groove, and the groove of the dress board formed in the second dressing step is referred to as the second groove, the third dressing step dresses the cutting blade along the second groove and so as to overlap the second groove; the fourth dressing step dresses the cutting blade along the first groove and so as to overlap the first groove; How to dress.
8. The dressing method according to claim 1 or 2, In the first dressing step and the second dressing step, the speeds at which the cutting blade and the dressing board are moved relative to each other are equal. How to dress.
9. The dressing method according to claim 8, The speed at which the cutting blade and the dressing board are moved relative to each other in the first dressing step and the second dressing step is 10 mm / sec or less. How to dress.
Citation Information
Patent Citations
Dressing method for cutting blade
JP2010000588A