Chamfering device and chamfering method

Abstract

To provide a chamfering device and a chamfering method capable of chamfering a corner to form a large chamfer in one time with fine finish, without tilting a rotation axis backward.SOLUTION: A chamfering device comprises: n cutting chips each having a cutting edge; a rotary shaft that rotates the cutting chips; and a guide section that guides in a cutting advancing direction. In the chamfering device: an upper side of a rotational axis of the rotary shaft is inclined forward in the advancing direction; a corner portion of a workpiece is face-milled to form a chamfer; where a side contacting the workpiece is a lower side, the n cutting chips are sequentially arranged such that one with the cutting edge positioned lowest is a first cutting chip, and one with cutting edge positioned at the highest is an n-th cutting chip; a shortest distance (cutter diameter) from the rotational axis to the cutting edge, of the n-th cutting chip is formed largest; and the cutter diameter is gradually reduced toward the first cutting chip. There is also provided a chamfering method using the chamfering device to perform cutting sequentially from the n-th side toward the first side while forming steps, thereby forming a final finished surface.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for chamfering (including groove chamfering), and more particularly to an apparatus and method for chamfering by facing. [Background technology]

[0002] Generally, there are two methods for chamfering linearly continuous corners in a workpiece: face milling and shoulder milling. Face milling is a cutting method in which the rotation axis of the cutting tip is approximately perpendicular to the final formed surface of the workpiece. In other words, it is a cutting method in which the rotation axis of the cutting tip is at a 45-degree or adjusted inclination angle relative to the first and second intersecting surfaces that form the corner of the workpiece. Shoulder milling is a cutting method in which the rotation axis of the cutting tip is approximately parallel to the outer surface of the workpiece.

[0003] As mentioned above, face milling is used for chamfering, which creates a cutting surface at a 45-degree or adjusted inclination angle relative to the corner formed by the intersecting surfaces. In contrast, shoulder milling not only creates a chamfer that creates a cutting surface at a specified inclination angle, but also allows for R-chamfering (chamfering a corner formed by the intersecting surfaces to create an arc-shaped cross-sectional contour). While shoulder milling excels in this way in its versatility, face milling is more suitable for achieving a chamfer with a specified inclination angle more quickly and with higher precision.

[0004] Therefore, if chamfering is performed only to form a cut surface at a 45-degree or adjusted inclination angle relative to the corner formed by the intersecting planes, it is possible to perform face milling, which allows for more accurate chamfering and can be performed more quickly. However, when chamfering a workpiece using face milling, attempting to chamfer a larger dimension increases the cutting resistance, resulting in problems such as increased wear on the cutting tip. To address this problem, a method has traditionally been used in which the chamfering operation is performed in multiple steps, but this method inevitably reduces work efficiency. In light of this situation, a chamfering device has been disclosed that prevents a decrease in work efficiency and performs chamfering in a single face milling (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7356878 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the invention of the above-mentioned Patent Document 1, there is provided a chamfering device adapted to chamfer a corner of a workpiece having a linearly extending corner formed between two surfaces, the chamfering device comprising: a device housing; a drive unit arranged within the device housing; a rotary shaft having a base rotatably held within the device housing and a tip end located outside the device housing, the rotary shaft being drivingly connected to the drive unit and driven to rotate about a rotation axis; a cutting blade provided at the tip end of the rotary shaft and having a square cutting edge portion located at a position offset from the rotation axis; a guide member mounting portion provided on the device housing; and a first guide surface attached to the guide member mounting portion and abutting on one surface of the workpiece and a second guide surface attached to the guide member mounting portion and abutting on the other surface of the workpiece, This chamfering device is equipped with a guide member that causes the first and second guide surfaces to slide on each surface of the workpiece, thereby moving the chamfering device forward in a guide direction along the corner of the workpiece, and causes the rotation axis to tilt backward with respect to the guide direction, and the cutting blade chamfers the corner at a position forward of the rotation axis, and then further chamfers the portion chamfered at the forward position at a position rearward of the rotation axis.This chamfering device cuts and chamfers the corner of the workpiece in two stages, at a position forward of the rotation axis and a position rearward of the rotation axis, and therefore has the advantage of being able to perform a larger chamfer in a single chamfering operation compared to conventional chamfering devices that only cut at either the forward or rearward position.

[0007] However, in the chamfering device with the above configuration, the cutting blade in the front position cuts at an acute angle to the part to be cut, while the cutting blade in the rear position cuts at an obtuse angle to the part to be cut, which is thought to have the disadvantage that the cutting blade in the rear position puts a heavy load on the cutting edge and makes it difficult to form a clean cut surface.

[0008] The present invention has been made in consideration of the above circumstances, and the problem that the invention aims to solve is to provide a chamfering device and a chamfering method that can perform large chamfering operations in a single chamfering operation without tilting the rotation axis backward and can form a surface with a clean finish. [Means for solving the problem]

[0009] The chamfering device is provided with a maximum of n (n is an integer of 2 or greater) cutting tips each having a cutting edge, a rotary shaft for rotating the cutting tips, and a guide for guiding the cutting tips in the cutting direction, the upper side of the rotary shaft being inclined forward in the cutting direction, and chamfering the corners of a workpiece by face milling. The n cutting tips are arranged in order, with the side that contacts the workpiece being downward, from the cutting tip with the cutting edge in the lowest position as the first cutting tip to the cutting tip with the cutting edge in the highest position as the nth cutting tip, and the nth cutting tip of the n cutting tips is formed so that the shortest distance from the rotary shaft to the cutting edge (hereinafter referred to as the "cutter diameter") is the longest, and the cutter diameter gradually decreases until it reaches the first cutting tip. This chamfering device is a means for solving the above problem. [Effects of the Invention]

[0010] According to the present invention, by cutting using up to a maximum number n of cutting tips, cutting is performed in stages, and the load during cutting is distributed to each cutting tip, making it possible to perform large chamfering in a single chamfering operation.In addition, by cutting with the cutting edge of the cutting tip, which maintains an acute cutting angle on the front side in the cutting direction, it is possible to form a final formed surface with a good finish by face milling. [Brief explanation of the drawings]

[0011] [Figure 1] 1A to 1C are perspective views showing a back, a top, and a right side view illustrating a state in which a corner of a workpiece is being chamfered using the chamfering device according to Example 1 of the present invention. [Figure 2] 1 is a front view showing a chamfering device according to a first embodiment of the present invention and a corner of a workpiece. [Figure 3] 1 is a perspective view showing a connecting portion 4 and a guide portion 5 in a chamfering device according to a first embodiment of the present invention. [Figure 4] FIG. 1 is a right side view of a chamfering device according to a first embodiment of the present invention. [Figure 5] 1A and 1B are a bottom view and a front view, respectively, showing a cutting unit of a chamfering device according to a first embodiment of the present invention. [Figure 6] 3 is a schematic diagram showing the relationship between the relative vertical positions of cutting tips in the chamfering device according to the first embodiment of the present invention and the steps formed by cutting using all of the cutting tips. FIG. [Figure 7] 1 is a perspective view showing a workpiece on which a plurality of steps have been formed in a chamfering method using a chamfering device according to a first embodiment of the present invention. FIG. [Figure 8] 1 is a front view showing a state in which the adjustment ring of the chamfering amount setting unit in the chamfering device according to Example 1 of the present invention is rotated to move the cutting unit upward. FIG. [Figure 9] 3 is a schematic diagram showing the relationship between the relative vertical positions of cutting tips in the chamfering device according to the first embodiment of the present invention and steps formed by cutting using some of the cutting tips. FIG. [Figure 10] 10A and 10B are perspective views showing the front, bottom, and right side of a chamfering device according to a second embodiment of the present invention. [Figure 11] 10A and 10B are explanatory views showing an angle adjustment mechanism in a chamfering device according to a second embodiment of the present invention, in which (a) is an exploded view showing the relationship between a guide portion, an angle adjustment plate, and a casing, and (b) is an assembly view of the same. [Figure 12] 10A and 10B are a front view and a bottom view showing a cutting unit used in a chamfering device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] A chamfering device according to an embodiment of the present invention comprises a maximum of n (n is an integer of 2 or greater) cutting tips each having a cutting edge, a rotating shaft for rotating the cutting tips, and a guide for guiding the cutting tips in the cutting direction, with the upper side of the rotating shaft tilting forward in the cutting direction. The chamfering device chamfers the corners of a workpiece by face milling, and the n cutting tips are arranged in order, with the side that contacts the workpiece being downward, with the cutting tip with the cutting edge in the lowest position being the first cutting tip and the cutting tip with the cutting edge in the highest position being the nth cutting tip. Of the n cutting tips, the nth cutting tip has the largest cutter diameter, and the cutter diameters gradually become smaller until the first cutting tip is reached (first configuration).

[0013] According to the first configuration, by cutting using n cutting tips, cutting is performed in stages, which distributes the load during cutting, making it possible to perform chamfering of large dimensions, and also makes it possible to cut while maintaining an acute cutting angle on the front side in the cutting direction, making it possible to perform chamfering with a good finish by face milling.

[0014] Furthermore, in the present invention, based on the first configuration, the n cutting tips can be cutting tips of the same shape (second configuration).

[0015] According to the second configuration, in addition to achieving the effects of the first configuration, the use of cutting tips of the same common shape makes it possible to facilitate the work of attaching the cutting tips.

[0016] Furthermore, in the present invention, on the premise of the first or second configuration, the cutting tips can be arranged at unequal intervals in the circumferential direction (third configuration).

[0017] According to the third configuration, in addition to achieving the effects of the first or second configuration, it is possible to reduce vibrations that occur during cutting by shifting the phase of the cycle of cutting timing by the cutting tip.

[0018] Furthermore, the present invention can be configured, based on any of the first, second, or third configurations described above, such that the maximum number n is an integer greater than or equal to 3, and the cutting tips are arranged at uneven intervals in the vertical direction so as to evenly distribute the load on each cutting tip (fourth configuration).

[0019] According to the fourth configuration, the effects of any one of the first, second, or third configurations are achieved, and when distributing the load to each cutting tip, the load is distributed more evenly, thereby reducing the load on each cutting tip and enabling smoother cutting.

[0020] Furthermore, the present invention can also be a chamfering method using a chamfering device of any of the first, second, or third configurations described above, in which the chamfering device is advanced with its rotation axis tilted forward, and cutting is performed with the cutting tips at a position forward in the direction of advancement, and the cutting edge of the a-th cutting tip (a is an integer between 2 and n) from the bottom is used to cut the surface side of the corner of the workpiece to form a first step, and cutting is performed sequentially using the cutting edges up to the first cutting tip to form a number of steps, after which the corner having the step is removed, and the final formed surface is formed with the cutting edge of the first cutting tip (fifth configuration).

[0021] According to the fifth configuration, a maximum of n tips are used, and the cutting edge of the a-th cutting tip is used to cut the surface side of the corner of the workpiece to form a first cutting portion, and cutting is continued sequentially up to the first cutting tip, forming a number of steps, and by removing the corner with the a steps, the cutting load is distributed among the a cutting tips, making it possible to perform light cutting.As a result, large dimensions can be easily chamfered in a single cutting operation.

[0022] Furthermore, by using the first cutting tip to cut and form the final forming surface, it becomes possible to cut while maintaining an acute cutting angle on the front side in the cutting direction, making it possible to perform chamfering with a good finish by face milling.

[0023] Furthermore, the present invention can also be a chamfering method using the chamfering device of the fourth configuration, in which the chamfering device is advanced with the rotation axis tilted forward, and cutting is performed with the cutting tips at a position forward in the direction of advancement, and the blade portion of the bth cutting tip (b is an integer between 3 and n) from the bottom is used to cut the surface side of the corner of the workpiece to form a first step, and cutting is performed sequentially using the blade portions up to the first cutting tip to form b steps, after which the corner having the steps is cut off, and the final formed surface is formed with the blade portion of the first cutting tip (sixth configuration).

[0024] According to the sixth configuration, it is possible to obtain the same effects as those of the fifth configuration by using the chamfering device of the fourth configuration. [Example]

[0025] Hereinafter, a chamfering device E according to a first embodiment of the present invention will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and their description will not be repeated. To facilitate understanding of the description, the drawings referred to below show simplified or schematic configurations, and some components are omitted. Furthermore, the dimensional ratios of the components shown in each drawing do not necessarily represent the actual dimensional ratios.

[0026] A chamfering device E according to a first embodiment of the present invention is shown in Fig. 1. The chamfering device E according to the first embodiment can perform a maximum of C10 (or 10C) chamfering in one chamfering operation, that is, can cut and form a smooth final formed surface w4 (C chamfering) at a chamfering angle of 45° within a range of up to 10 mm from the ridge line at a corner w3 formed by a first surface w1 and a second surface w2 of the workpiece W toward the first surface w1 and the second surface w2.

[0027] As shown in Figures 1, 2, and 4, the chamfering device E of Example 1 has a chamfering device main body 1, a chamfering amount setting unit 2 and a cutting unit 3 provided on the lower side of the chamfering device main body 1, a guide unit 5 that contacts the workpiece W and guides movement in the direction of travel during cutting, and a connecting unit 4 provided between the guide unit 5 and the chamfering amount setting unit 2.

[0028] The chamfering device main body 1 includes a base 15, a casing 10 disposed on the base 15, an air motor 11A serving as a drive unit 11 secured to the base 15 and housed within the casing 10, a supply unit 13 for supplying air to drive the air motor 11A, and a switch unit 14 for operating the air motor 11A. The casing 10 of the chamfering device E according to this embodiment serves as a grip for holding the chamfering device E during operation. The switch unit 14 is provided from the top of the casing 10 serving as the grip to the supply unit 13, and is pressed by the palm of the hand when the casing 10 is gripped, turning the switch unit 14 ON. The air motor 11A within the casing 10 has a rotating shaft 12 with its longitudinal direction extending vertically.

[0029] The lower part of the base part 15 also includes a chamfering amount setting unit 2 for adjusting the position of the cutting part 3 relative to the guide part 5 in the vertical direction to set the chamfering amount. The chamfering amount setting unit 2 includes a cylindrical part 16 (see FIG. 8 ) integrally formed at the lower part of the base part 15 and an adjustment ring 20 attached to the periphery of the cylindrical part 16. The cylindrical part 16 has a continuous recess (not shown) extending over a certain range in the spiral direction. An engagement protrusion (not shown) on the inner surface of the adjustment ring 20 fits into the recess of the cylindrical part 16, allowing the cylindrical part 16 to move relatively within a predetermined range in the vertical direction when the adjustment ring 20 is rotated within a certain range. Therefore, by rotating the adjustment ring 20, the cylindrical part 16, the casing 10 and air motor 11 fixed thereto, and the cutting part 3 can be raised and lowered relative to each other. The adjustment ring 20 has a scale 20a that visually indicates the settable chamfering amount, corresponding to the relative positions of the cutting part 3 and the guide part 5. The relative position of the cutting part 3 with respect to the workpiece W abutting against the guide part 5 can be set to the desired position on the scale 20a by rotating the adjustment ring 20 of the chamfering amount setting part 2, thereby obtaining the desired chamfering amount.

[0030] 2, a cutting unit 3 is attached to the lower end of a rotary shaft 12 of an air motor 11. A connecting unit 4 is provided below the chamfering amount setting unit 2 and around the cutting unit 3.

[0031] The connecting portion 4 has a generally cylindrical outline with a slightly wider diameter at the bottom. The lower end of the connecting portion 4 has a first notch 40 and a second notch 41. The guide portion 5 is attached to the first notch 40. The second notch 41 reduces the width of the connecting portion 4, thereby reducing the overall width of the chamfering device E and improving the degree of freedom during operation. To prevent fingers from coming into contact with the cutting portion 3 through the opening created by the formation of the second notch 41, the opening is closed by a protective plate 42. The protective plate 42 is made of punched metal with multiple small holes (see Figure 3), allowing the operation of the cutting portion 3 to be visually observed.

[0032] As shown in FIGS. 2 and 3, the guide unit 5 has a first guide plate 50 and a second guide plate 51, each having a contact surface with the workpiece W. The first guide plate 50 has a first inlet-forming notch 50a that opens to one side surface. The second guide plate 51 has a second inlet-forming notch 51a that opens to one side surface. The first guide plate 50 and the second guide plate 51 are fixed to the first notch 40 of the connecting unit 4 in an arrangement in which the first inlet-forming notch 50a and the second inlet-forming notch 50b face each other and the angle between their contact surfaces is a right angle. By arranging the first inlet-forming notch 50a and the second inlet-forming notch 51a facing each other, an inlet 52 is formed in the guide unit. 1 and 4, the rotation axis m of the rotating shaft 12 is arranged to be slightly tilted forward with respect to the longitudinal direction of the guide part 5, i.e., the cutting proceeding direction n (i.e., the upper side of the rotation axis m is tilted toward the proceeding direction). In other words, the angle θ between the cutting proceeding direction n and the rotation axis m is configured to be less than 90°.

[0033] The cutting unit 3 is the most important part in the present invention, and as shown in Figures 5(a) and 5(b), it has a cutting tip holder 30 and up to six cutting tips 31 that are detachably attached to the cutting tip holder 30. The cutting tip holder 30 rotates around a rotation axis m that is common to the rotation shaft 12 of the air motor 11A. The cutting tip holder 30 has a connection part 300 that connects to the rotation shaft 12 of the air motor 11A and a holding part 301 for holding each cutting tip 31.

[0034] Each cutting tip 31 is a throw-away tip, and has cutting edges 310 at four locations per cutting tip 31. One of the cutting edges 310 is used for cutting. When one cutting edge 310 is worn out, the other cutting edges 310 can be used by rotating the cutting tip 90°.

[0035] The six cutting tips 31 have the same shape. However, the installation positions of the cutting tips 31, i.e., the vertical (height) positions and radial positions, are all different. Specifically, as shown in Figure 6, which shows the cutting positions of the cutting tips 31 relative to the workpiece W, the cutting tip 31 located at the lowest position in the height direction is the first cutting tip 31a, followed by the second cutting tip 31b, third cutting tip 31c, fourth cutting tip 31d, fifth cutting tip 31e, and the cutting tip located at the highest position is the sixth cutting tip 31f. The shortest distance (referred to as cutter diameter r) from the rotation axis m, which is the center of rotation of the cutting tip holder 30, to the blade portion 310 of each cutting tip 31 is arranged so that the first cutting tip 31a has the smallest cutter diameter r1, followed by the second cutting tip 31b, third cutting tip 31c, fourth cutting tip 31d, and fifth cutting tip 31e, which have cutter diameters r2, r3, r4, and r5, respectively, from the smallest cutter diameter r, and the sixth cutting tip 31f has the largest cutter diameter r6.

[0036] Here, the cutting tips 31 are not arranged at equal intervals in the height direction, but are arranged at unequal intervals so that the load on each cutting tip 31 during cutting is distributed approximately evenly, as shown in FIG. Specifically, the heightwise spacing p1 from the blade portion 310 of the sixth cutting tip 31f to the blade portion 310 of the fifth cutting tip 31e, the heightwise spacing p2 from the blade portion 310 of the fifth cutting tip 31e to the blade portion 310 of the fourth cutting tip 31d, the heightwise spacing p3 from the blade portion 310 of the fourth cutting tip 31d to the blade portion 310 of the third cutting tip 31c, the heightwise spacing p4 from the blade portion 310 of the third cutting tip 31c to the blade portion 310 of the second cutting tip 31b, and the heightwise spacing p5 from the blade portion 310 of the second cutting tip 31b to the blade portion 310 of the first cutting tip 31a are all different dimensions, and each cutting tip is positioned so that the load on each cutting tip 31a to 31f is approximately equal during cutting.

[0037] Furthermore, as shown in Figure 5(b), the circumferential arrangement of each cutting tip 31 is not at equal intervals, but rather the cutting timing cycle of each cutting tip 31 is shifted in phase and arranged at unequal intervals, thereby making it possible to reduce vibrations that occur during cutting.

[0038] In the above configuration, when chamfering C10, which is the maximum chamfer, using the chamfering device E according to Example 1 of the present invention, all six cutting tips, which is the maximum number, are used. In this case, the adjustment ring 20 is rotated left in a plan view to lower the base part 15 to its lowest position (the position where it abuts against the adjustment ring 20), and the cutting part 3, which moves together with the base part 15, is set to its lowest position.

[0039] 1, when the guide portion 5 is pressed against the workpiece W and the chamfering device E is moved in the cutting direction n, the blade portion 310 of the sixth cutting tip 31f first contacts the workpiece W and forms a first cutting surface b1 at a cutting depth h1, thereby forming a first step s1 that is arc-shaped in plan view. Next, the blade portion 310 of the fifth cutting tip 31e contacts the workpiece W and forms a second cutting surface b2 at a cutting depth h2 from the first cutting surface b1, thereby forming a second step s2 that is arc-shaped in plan view and includes the first cutting surface below the first step s1. Then, the cutting edges 310 of the fourth cutting tip 31d, the third cutting tip 31c, the second cutting tip 31b, and the first cutting tip 31a sequentially form cutting surfaces (the third cutting surface b3, the fourth cutting surface b4, the fifth cutting surface b5, and the sixth cutting surface b6) at cutting depths h3, h4, and h5, respectively, forming the third step s3, the fourth step s4, the fifth step s5, and the sixth step s6, each of which has an arc-shaped shape in plan view (see FIG. 7). As cutting continues in the cutting direction n, when the sixth cutting surface b6 reaches the final end, the corner w3 containing each step s (s1 to s6) is removed, leaving only the sixth cutting surface b6 as the final formed surface w4. The cutting depths h1 to h6 are formed to different dimensions. The cutting depths h2 to h6 are determined by the intervals p1 to p5 between the cutting tips 31f to 31a, respectively.

[0040] As shown in FIG. 6, each cutting tip 31a to 31f performs cutting at a forward position in the cutting direction n, which makes it possible to maintain an acute cutting angle during cutting, thereby enabling chamfering with a good finish by face milling.

[0041] Using the chamfering device E according to this embodiment, which is capable of chamfering up to C10, it is possible to perform chamfering of, for example, C5 (or 5C) (chamfering performed by cutting a 5 mm range from the linear ridge of the corner w3 of the workpiece W to each surface (first surface w1, second surface w2) that forms the corner w3, at a chamfering angle of 45°). First, as shown in FIG. 8, the adjustment ring 20 of the chamfering amount setting unit 2 is rotated, and the scale 20a is adjusted so that the chamfering amount is 5 mm. This operation moves the cutting unit 3 axially (up and down), allowing the cutting unit 3 to be set to a position appropriate for chamfering the amount of 5 mm.

[0042] 9, when forming C5 in this embodiment, the blade portions 310 of the fifth cutting tip 31e and the sixth cutting tip 31f rotate freely without contacting the workpiece W. Therefore, in this embodiment, cutting is performed in a state where the load is distributed among the four cutting tips 31 from the fourth cutting tip 31d to the first cutting tip 31a.

[0043] When the guide portion 5 is pressed against the workpiece W and the chamfering device E is moved in the cutting direction n, the blade portion 310 of the fourth cutting tip 31d first contacts the workpiece W to form a first cutting surface b1, thereby forming a first step s1. Next, the blade portion 31c of the third tip contacts the workpiece W to form a second cutting surface b2, thereby forming a second step s2 including the first cutting surface b1 below the first step s1. Then, the blade portions 310 of the second cutting tip 31b and the first cutting tip 31a sequentially form cutting surfaces (third cutting surface b3 and fourth cutting surface b4), thereby forming the third step s3 and the fourth step s4, respectively. The fourth cutting surface b4 is the deepest cutting surface and becomes the final cutting surface w4 (surface C). As the cutting progresses in the cutting direction n, when the fourth cutting surface b4 reaches the final end, the corner w3 having each step s (s1 to s4) is cut away, and only the fourth cutting surface b4 remains as the final formed surface w4.

[0044] 10, it is also possible to provide a chamfering device E having an angle adjustment mechanism for the guide part 5 as a second embodiment of the present invention. The chamfering device E according to the second embodiment has the same cutting part 3 as the chamfering device E according to the first embodiment, and also has an angle adjustment mechanism for the guide part 5, which makes it possible to change the chamfering angle.

[0045] The chamfering device E according to the second embodiment has a chamfering device main body 1, a cutting unit 3 provided below the chamfering device main body 1, and a guide unit 5 that contacts the workpiece W and guides its movement in the direction of travel during cutting. The guide unit 5 has an angle adjustment mechanism. The guide unit 5 is provided at the lower end side of the casing 10 of the chamfering device main body 1, with the angle adjustment mechanism connected to it.

[0046] The chamfering device main body 1 of the chamfering device E of Example 2 has a base portion (not shown), a casing 10 covering the base portion, an electric motor 11B as a drive portion 11 fixed to the base portion, a supply portion 13 for supplying power to drive the electric motor 11B, a switch portion 14 for operating the electric motor 11B, and a bevel gear mechanism (not shown) connected to the drive shaft of the electric motor 11B.

[0047] The drive shaft of the electric motor 11B is arranged with its longitudinal direction in the horizontal direction (front-to-back direction). A bevel gear mechanism connected to the drive shaft converts the axial direction and includes a rotating shaft having a rotation axis m with its longitudinal direction in the up-down direction.

[0048] A cutting unit 3 is provided at the lower end of the rotation shaft of the chamfering device main body 1. Therefore, the cutting unit 3 rotates around the rotation axis m of the chamfering device main body 1.

[0049] As in Example 1, the cutting direction n guided by the guide portion 5 and the rotation axis m are not perpendicular, the upper part of the rotation axis m is tilted forward with respect to the cutting direction n, and the angle θ formed between the cutting direction n and the upper side of the rotation axis m is less than 90°. A handle portion 18 is provided on the right side plate 10b of the casing 10.

[0050] As in Example 1, the cutting unit 3 has a cutting tip holder 30 and up to six cutting tips 31 that are detachably attached to the cutting tip holder 30. The cutting unit 3 is connected to the lower end of the rotating shaft.

[0051] 11(a), in addition to guide plates 50 and 51, guide unit 5 includes front and rear angle adjustment plates 53 and multiple fixing screws 54. The angle adjustment mechanism is configured by threading multiple fixing screws 54 into threaded holes 530 provided in each of front and rear angle adjustment plates 53, through elongated holes 17 extending in an arc shape formed in part of casing 10 (casing front plate 10a and casing back plate 10c).

[0052] As shown in Figure 11(b), the angle of the angle adjustment plate 53 can be changed by changing the fixing position of the fixing screw 54 relative to the oblong hole 17, and the angle of the guide plates 50, 51 to which the angle adjustment plate 53 is attached can be adjusted in the left-right direction t. By changing the angle of the guide plates 50, 51, when the guide plates 50, 51 are brought into contact with the corner w3 of the workpiece W, the angle of the cutting part 3 is changed relatively, making it possible to set the chamfer angle to an angle other than 45 degrees (C-face). Because the angle adjustment is performed in the left-right direction, the angle θ between the cutting direction n and the rotation axis m is always maintained at less than 90 degrees.

[0053] The chamfering device E according to the second embodiment includes a mechanism (not shown) for moving the cutting part 3 up and down relative to the guide part 5 inside the casing 1, and the chamfering dimensions can be changed in the same way as in the first embodiment.

[0054] In Examples 1 and 2, the maximum number of cutting tips 31 is six, but this is not intended to limit the scope of the present invention. The number of cutting tips 31 may be at least two, or at least three to ensure that the cutting depths h of the cutting tips 31 are unequally spaced. It may also be seven or more. On the other hand, in the case of a chamfering device E configured as in Examples 1 and 2, in which an operator grips a portion of the casing 10 and moves it over the linear corners w3 of the workpiece W, a relatively small diameter cutting tip holder 30 is desirable from the perspective of compacting the chamfering device E to improve workability. Therefore, the number of cutting tips 31 that can be held is limited by installation space. Furthermore, from the perspective of distributing the cutting load, it is desirable to be able to hold as many cutting tips 31 as possible. Therefore, it is particularly preferable to have a number of cutting tips 31 of approximately four to six. An example of a cutting unit 3 capable of chamfering C5 with five cutting tips 31 is shown in Figures 12(a) and 12(b).

[0055] In this embodiment, all cutting tips 31 have the same shape, but the present invention is not limited to this, and some or all of the multiple cutting tips 31 may have different shapes. On the other hand, by making all cutting tips 31 the same shape, convenience when attaching the cutting tips 31 is improved.

[0056] In addition, in this embodiment, the height intervals p (p1 to p5) of the cutting chips 31 are irregular and unequally spaced, but the present invention is not limited to this configuration, and for example, the nth cutting chip 31 to the 1st cutting chip 31 can also be arranged so that the height intervals gradually decrease from p1 to p5.

[0057] In the present invention, "chamfering" includes groove chamfering. For example, the chamfering device E disclosed in the second embodiment of the present invention can be a chamfering device E for performing groove chamfering. [Explanation of symbols]

[0058] b1 Cutting surface b2 Cutting surface b3 Cutting surface b4 Cutting surface b5 Cutting surface E Chamfering device h1(h) cutting depth h2(h) cutting depth h3(h) Cutting depth h4(h) cutting depth h5(h) cutting depth h6(h) cutting depth m Rotation axis n Cutting direction p1(p) interval p2(p) interval p3(p) interval p4(p) interval p5(p) interval r1(r) cutter diameter r2(r) cutter diameter r3(r) cutter diameter r4(r) cutter diameter r5(r) cutter diameter r6(r) cutter diameter s1(s) step s2(s) step s3(s) step s4(s) step s5(s) step s6(s) step t Left / right direction W Workpiece w1 1st page w2 2nd side w3 corner w4 Final forming surface 1 Chamfering device body 10 Casing 10a Casing front plate 10b Casing right side plate 10c Casing back panel 11 Drive unit 11A air motor 11B Electric motor 12 Rotation axis 13 Supply section 14 Switch section 15 Base 16 Cylindrical part 17 Slot (arc-shaped slot) 18 Handle 2 Chamfer amount setting section 20 Adjustment Ring 20a scale 3 Cutting part 30 Cutting tip holder 300 Connection 301 Holding part 31 Cutting tip 31a First cutting tip 31b Second cutting tip 31c Third Cutting Insert 31d 4th cutting tip 31e 5th Cutting Insert 31f 6th cutting tip 4 Connecting part 40 First notch 41 Second notch 42 Protective plate 5 Guide section 50 First guide plate 50a First inlet forming notch 51 Second guide plate 51a: Second inlet forming notch 52 entrance 53 Angle adjustment plate 54 Fixing screw

Claims

1. a maximum number n (n is an integer of 2 or more) of cutting tips each having a cutting edge; a rotation shaft that rotates the cutting tip; A guide portion is provided for guiding the cutting tool in the cutting advance direction. The upper side of the rotation axis of the rotation shaft is tilted forward in the direction of travel, A chamfering device for chamfering corners of a workpiece by face milling, The side that contacts the workpiece is defined as the lower side, The n cutting tips are arranged in order, with the cutting tip with the cutting portion at the lowest position being the first cutting tip and the cutting tip with the cutting portion at the highest position being the nth cutting tip, A chamfering device characterized in that, among the n cutting tips, the nth cutting tip is formed so that the shortest distance from the rotation axis to the blade portion (hereinafter referred to as the "cutter diameter") is the largest, and the cutter diameter is formed so that it gradually becomes smaller until it reaches the first cutting tip.

2. 2. The chamfering device according to claim 1, wherein the n cutting tips are cutting tips of the same shape.

3. 2. The chamfering device according to claim 1, wherein the cutting tips are arranged at uneven intervals in the circumferential direction.

4. 2. The chamfering device according to claim 1, wherein the maximum number n is an integer of 3 or greater, and the cutting tips are arranged at uneven intervals in the vertical direction so as to evenly distribute the load on each cutting tip.

5. A chamfering method using the chamfering device according to any one of claims 1, 2 and 3, The chamfering device is advanced with the rotation axis tilted forward, and cutting is performed by the cutting tip at a forward position in the advancing direction, A chamfering method characterized by cutting the surface side of a corner of a workpiece using the blade portion of the ath (a is an integer of 2 or more and n or less) cutting tip from the bottom to form a first step, cutting sequentially using the blade portions of the cutting tips up to the first cutting tip to form a number of steps, and then cutting the corner having the steps, and forming a final formed surface using the blade portion of the first cutting tip.

6. 5. A chamfering method using the chamfering device according to claim 4, The chamfering device is advanced with the rotation axis tilted forward, and cutting is performed by the cutting tip at a forward position in the advancing direction, A chamfering method characterized by cutting the surface side of a corner of a workpiece using the blade portion of the bth cutting tip (b is an integer of 3 or more and n or less) from the bottom to form a first step, and then cutting is continued using the blade portions of the cutting tips up to the first cutting tip to form b steps, after which the corner having the steps is cut off and a final formed surface is formed using the blade portion of the first cutting tip.

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