Tool body and round insert for cutting tool with replaceable tip

Abstract

The present invention provides a tool body and a circular blade of a tool tip replaceable cutting tool. By keeping the contact part between the circular blade and the tool body at a predetermined fixed position, no floating or shaking occurs during installation. The tool body includes a recessed portion, and the circular blade is formed with a plurality of convex portions protruding along its radial direction. Only one of the plurality of convex portions is embedded in the recessed portion. Each inner side surface of the recessed portion is composed of a curved surface, so that in the contact area of ​​the recessed portion in contact with the convex portion embedded in the recessed portion among the plurality of convex portions, the interval between the inner side surfaces on both sides of the recessed portion gradually decreases toward the depth of the recessed portion. The circular blade installed on such a tool body has a plurality of convex portions protruding along its radial direction, and any one of the convex portions may be embedded in the recessed portion of the mounting seat of the tool body. Each outer side surface of the convex portion is composed of a curved surface, so that in the contact area of ​​the convex portion in contact with the recessed portion when embedded in the recessed portion, the interval between the outer side surfaces on both sides of the convex portion gradually decreases toward the front end of the convex portion.

Description

Technical Field

[0001] The present invention relates to a tool body of a cutting edge replaceable cutting tool using a circular blade as a replaceable cutting edge and a circular blade. Background Art

[0002] In a conventional cutting tool with a replaceable cutting edge that uses a circular insert as a replaceable cutting edge, the convex side of the circular insert is designed to contact the concave side of the supporting seat in order to stably fix the circular insert on the supporting seat (for example, refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-24124

[0006] Technical issues

[0007] Even if the convex side of the circular blade is designed to contact the concave side of the tool body support seat, in reality, due to processing accuracy or assembly errors, they cannot make surface contact with each other, and in most cases they are in point contact or line contact at any point. Contact at an unplanned position may cause the circular blade to float or wobble.

[0008] The present invention is completed to solve such problems, and its purpose is to provide a tool body and a circular blade of a cutting tool with a replaceable blade tip, which will not cause floating or shaking during installation by keeping the contact part between the circular blade and the tool body at a predetermined fixed position. Summary of the invention

[0009] On the one hand, the present invention provides a tool body, which is a tool body for installing a circular blade to form a tip-replaceable cutting tool, and the mounting seat for installing the circular blade includes: a seating surface that contacts one surface of the circular blade; an internal threaded hole, which is arranged on the seating surface and is used to accommodate an external thread to fix the circular blade; a recess, the circular blade has a plurality of convex portions protruding along its radial direction, and only one of the plurality of convex portions is embedded in the recess, and each inner side surface of the recess is composed of a curved surface, so that in the contact area of ​​the recess where the recess contacts the convex portion embedded in the recess among the plurality of convex portions, the interval between the inner side surfaces on both sides of the recess gradually decreases toward the depth of the recess.

[0010] On the other hand, the present invention provides a circular blade, which is a circular blade installed on a tool body to form a cutting tool with a replaceable cutting tip. The circular blade has a plurality of protrusions formed by radial protrusions, any of which may be embedded in a recessed portion of a mounting seat provided on the tool body, and each outer side surface of the protrusion is composed of a curved surface, so that in the contact area where the protrusion contacts the recess when embedded in the recess, the interval between the outer side surfaces on both sides of the protrusion gradually decreases toward the front end portion of the protrusion.

[0011] According to the present invention, a tool body and a circular blade of a cutting tool with a replaceable cutting edge are provided, wherein the contact portion of the circular blade with the tool body is maintained at a predetermined fixed position, so that floating or shaking does not occur during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall perspective view of the cutting tool according to this embodiment.

[0013] Figure 2 It is an overall three-dimensional diagram of a hexagonal circular blade.

[0014] Figure 3 It is an overall three-dimensional diagram of an octagonal circular blade.

[0015] Figure 4 This is a partial enlarged view of the mounting base.

[0016] Figure 5 This is a diagram of the cutting tool viewed from the side.

[0017] Figure 6 is a cross-sectional view showing a contact portion of the circular blade and the tool body.

[0018] Figure 7 It is a diagram schematically showing the contact area between the circular insert and the tool body.

[0019] Main component symbols

[0020] Cutting Tools 100

[0021] Tool body 200

[0022] Mounting Block 210

[0023] Seating surface 212

[0024] Internal thread hole 213

[0025] Recess 220

[0026] The first inner side 221

[0027] Second ridgeline 221a

[0028] The second inner side 222

[0029] Second ridgeline 222a

[0030] Circular blade 300

[0031] Upper surface 311

[0032] Side 312

[0033] Bottom 313

[0034] Cutting edge 320

[0035] Mounting hole 330

[0036] Projection 350

[0037] First outer side 351

[0038] The second outer side 352

[0039] Digging part 353

[0040] Circular blade 400

[0041] Upper surface 411

[0042] Side 412

[0043] Bottom 413

[0044] Cutting edge 420

[0045] Mounting hole 430

[0046] Projection 450

[0047] First outer side 451

[0048] Second outer side 452

[0049] Digging part 453

[0050] External thread 500 DETAILED DESCRIPTION

[0051] Embodiments of the present invention are described with reference to the accompanying drawings. In addition, in each figure, components marked with the same symbol have the same or similar structure. In addition, in each figure, when there are multiple structures with the same or similar structure, in order to avoid complication, a part is marked with a symbol, and the same symbol is omitted for other parts.

[0052] Figure 1The figure is an overall perspective view of a cutting tool 100, which is a cutting edge replaceable cutting tool according to the present embodiment. The cutting tool 100 comprises a tool body 200, a circular insert 30 mounted on the tool body, and a clamping screw 500, which is an external thread, for fixing the circular insert 300 to the tool body.

[0053] Mounting seats 210 are provided at predetermined intervals along the circumferential direction at the front peripheral portion of the tool body 200. As shown in the figure, the tool body 200 of this embodiment is provided with five mounting seats at intervals of 72 degrees. A circular blade 300 is fixed to each mounting seat 210 via an external thread 500.

[0054] Figure 2 It is an overall perspective view of a hexagonal circular blade 300 having six mounting locations. Figure 2 (A) is a top view of the circular blade 300. Figure 2 (B) is a bottom view of the circular blade 300. The circular blade 300 is generally in the shape of a truncated cone, and has a large-diameter upper surface 311, a small-diameter bottom surface 313, and a side surface 312 connecting the upper surface 311 and the bottom surface 313. A cutting edge 320 is provided along the circumferential ridge of the upper surface 311. When the circular blade 300 is mounted on the mounting seat 210 of the tool body 200, a portion of the cutting edge 320 protrudes from the front end of the tool body 200.

[0055] The circular blade 300 has a mounting hole 330 for the external thread 500 to pass through, and the mounting hole 330 passes through the center axis of the truncated cone. On the side of the bottom surface 313 of the slightly lower half of the truncated cone, there are dug-out portions 353 at equal intervals in the circumferential direction. Since the circular blade 300 is a hexagonal circular blade, six dug-out portions 353 are provided at intervals of 60°. The dug-out portion 353 has a shape obtained by removing a portion passing through the side surface 312 to the bottom surface 313. As a result of providing the dug-out portions 353, a radially protruding convex portion 350 is formed between two adjacent dug-out portions 353. The circular blade 300 has six convex portions 350. In the present embodiment, when viewed from the side of the bottom surface 313, the outer side surface on the counterclockwise side of each convex portion 350 is the first outer side surface 351, and the outer side surface on the clockwise side is the second outer side surface 352.

[0056] The six protrusions 350 have the same shape. As will be described later, any one of the protrusions 350 can be embedded in a recessed portion of the mounting seat 210 of the tool body 200. That is, the circular blade 300 having the six protrusions 350 can be fixed to the mounting seat 210 in six directions (phases) by having the protrusions 350 embedded in the recessed portions of the mounting seat 210. When the cutting edge 320 reaches the limit of use in a certain phase, the user can change the phase and reinstall the circular blade 300 for reuse.

[0057] Figure 3 It is an overall three-dimensional view of an octagonal circular blade 400 having eight mounting locations. Figure 3 (A) is a top view of the circular blade 400. Figure 3 (B) is a bottom view of the circular blade 400. The structure of the octagonal circular blade 400 is the same as that of the hexagonal circular blade 300. The circular blade 400 is generally in the shape of a truncated cone, and has the same size as the circular blade 300, and has a large-diameter upper surface 411, a small-diameter bottom surface 413, and a side surface 412 connecting the upper surface 411 and the bottom surface 413.

[0058] Similar to the circular blade 300, a cutting edge 420 is provided along the circumferential ridgeline of the upper surface 411, and a mounting hole 430 is provided for the external thread 500 to penetrate, and the mounting hole 430 penetrates the central axis of the truncated cone. On the side of the bottom surface 413 of the slightly lower half of the truncated cone, there are dug-out portions 453 at equal intervals in the circumferential direction. Although this is also the same as the circular blade 300, the circular blade 400 is an octagonal circular blade, so 8 dug-out portions 453 are provided at intervals of 45°, resulting in 8 radially protruding convex portions 450. In this embodiment, when viewed from the side of the bottom surface 413, the counterclockwise outer side surface of each convex portion 450 is a first outer side surface 451, and the clockwise outer side surface is a second outer side surface 452.

[0059] The eight protrusions 450 have the same shape, and the shape of the protrusions 450 is the same as the shape of the protrusions 350 of the circular blade 300. Therefore, any one of the protrusions 450 can be embedded in the recess of the mounting seat 210 provided in the tool body 200. That is, the circular blade 400 having eight protrusions 450 can be fixed to the mounting seat 210 in eight directions (phases) by having the protrusions 450 embedded in the recess of the mounting seat 210. When the cutting edge 420 reaches the limit of use in a certain phase, the user can change the phase and reinstall the circular blade 400 for reuse.

[0060] In addition, in the present embodiment, although the hexagonal circular blade 300 and the octagonal circular blade 400 are described, even circular blades with other angles can be mounted on the tool body 200 as long as the shape of the protrusion is the same as these. In the following description, although the installation of the circular blade 300 is described as an example, the installation of other circular blades is the same.

[0061] Figure 4 is a partial enlarged view of the mounting base 210, showing Figure 1The mounting seat 210 has a seating surface 212 in contact with a bottom surface 313 of the circular blade 300, an internal thread hole 213 provided on the seating surface 212 for accommodating the external thread 500, and a recessed portion 220 provided to receive a protrusion 350 of the circular blade 300.

[0062] The recess 220 is formed by digging in a direction away from the central axis of the internal threaded hole 213 (depth direction), and as a result, two inner side surfaces are formed relative to the depth direction, namely, a first inner side surface 221 and a second inner side surface 222. In this embodiment, when looking down at the seating surface 212, the inner side surface on the clockwise side of the recess 220 is the first inner side surface 221, and the inner side surface on the counterclockwise side is the second inner side surface 222.

[0063] Figure 5 This is a diagram of the cutting tool 100 as viewed from the side. Figure 6 yes Figure 5 The BB cross-sectional view is a cross-sectional view taken along a plane including the convex portion 350 of the circular insert 300 mounted on the mounting seat 210 . More specifically, it is a cross-sectional view showing a contact portion between the circular insert 300 and the tool body 200 .

[0064] As described above, the convex portion 350 of the circular blade 300 is embedded in the concave portion 220 of the mounting seat 210 and fixed. The engagement of the convex portion 350 and the concave portion 220 fixes the phase of the circular blade 300. In other words, the engagement of the convex portion 350 and the concave portion 220 prevents the circular blade 300 from rotating.

[0065] In the recessed portion 220, the predetermined contact area with the convex portion 350 is the two inner side surfaces of the recessed portion 220, that is, a portion of the first inner side surface 221 and the second inner side surface 222. In the convex portion 350, the predetermined contact area with the recessed portion 220 is the two outer side surfaces of the convex portion 350, that is, a portion of the first outer side surface 351 and the second outer side surface 352. That is, it is predetermined that the first inner side surface 221 and the first outer side surface 351 are in contact with each other, and the second inner side surface 222 and the second outer side surface 352 are in contact with each other.

[0066] In fact, when the circular blade 300 is fixed by the external thread 500, due to tolerance or processing accuracy, one side is in contact and the other side may have a gap. In the example shown in the figure, a gap is generated between the first inner side surface 221 and the first outer side surface 351, and the second inner side surface 222 and the second outer side surface 352 are in contact with each other. For example, when the circular blade 300 is fixed on the mounting seat 210, the first inner side surface 221 contacts the first outer side surface 351 due to the rotation force of the external thread 500 tightened clockwise, and the second inner side surface 222 contacts the second outer side surface 352 due to the cutting force during cutting.

[0067] Figure 7 Schematically shows the contact area between the circular blade 300 and the tool body 200. Specifically, Figure 7 The figure schematically shows a state in which the circular blade 300 is slid on the seating surface 212 and the convex portion 350 and the concave portion 220 are slightly separated from each other, as viewed through the inside of the convex portion 350 .

[0068] As described above, in the recess 220, the predetermined contact area with the convex portion 350 is the two inner side surfaces of the recess 220, that is, a part of the first inner side surface 221 and the second inner side surface 222. The first inner side surface 221 and the second inner side surface 222 are both composed of curved surfaces, so that the interval D2 between them gradually decreases toward the depth portion indicated by the white arrow. In addition, the first inner side surface 221 and the second inner side surface 222 are unfolded in a manner of extending upward toward the inner space from the rising part of the boundary between them and the seating surface 212, and the first ridge line 221a and the second ridge line 222a are formed at the boundaries between them and the upper surface. In other words, the first ridge line 221a and the second ridge line 222a are the most protruding parts of the first inner side surface 221 and the second inner side surface 222 toward the inner space of the recess 220. The recess 220 contacts the convex portion 350 on at least one of the first ridge line 221a and the second ridge line 222a.

[0069] As described above, in the convex portion 350, the predetermined contact area with the concave portion 220 is a portion of the two outer side surfaces of the convex portion 350, namely, the first outer side surface 351 and the second outer side surface 352. The first outer side surface 351 and the second outer side surface 352 are both composed of curved surfaces, so that the interval D3 between them gradually decreases toward the front end of the convex shape. In addition, the first outer side surface 351 and the second outer side surface 352 are formed so that the area S of the cross section of the convex portion parallel to the bottom surface 313 gradually increases in the direction away from the bottom surface 313. In particular, in the present embodiment, the first outer side surface 351 and the second outer side surface 352 are formed as a portion of a truncated cone. The convex portion 350 contacts the concave portion 220 on at least one of the first outer side surface 351 and the second outer side surface 352.

[0070] A cutting tool 100 is provided. By realizing such a three-dimensional structure, the contact portion between the circular blade 300 and the tool body 200 can be maintained at a predetermined fixed position, so that no floating or shaking occurs during installation. In addition, since the ridge is in contact with the curved surface, stress concentration is alleviated compared to plane contact, and plastic deformation of the contact portion can be reduced. In addition, by limiting the contact portion to at least one of the first ridge 221a and the second ridge 222a away from the seating surface 212, a force is generated to press the circular blade 300 against the seating surface 212, further suppressing shaking. In addition, in the replaceable circular blade 400, the protrusion 450 is formed in the same manner as the protrusion 350, so that the same effect can be obtained.

Claims

1. A tool body, which is a tool body for mounting a circular blade to form a tool tip replaceable cutting tool, The mounting base for mounting the circular blade comprises: a seating surface in contact with a surface of the circular blade; An internal threaded hole, disposed on the seating surface, for receiving an external thread to fix the circular blade; The circular blade has a plurality of protrusions protruding along its radial direction, and only one of the plurality of protrusions is embedded in the concave portion. Each inner side surface of the concave portion is formed by a curved surface, so that in a contact area of ​​the concave portion contacting a convex portion of the plurality of convex portions embedded in the concave portion, the interval between the inner side surfaces on both sides of the concave portion gradually decreases toward the depth of the concave portion; The inner side surfaces each have ridges that are opposite to each other and protrude toward the inner space in the contact region.

2. A circular blade is a circular blade mounted on a tool body to form a cutting tool with a replaceable tip. The circular blade has a plurality of protrusions formed along its radial direction, any of which may be embedded in a recessed portion of a mounting seat of the tool body, and each inner side surface of the recessed portion is composed of a curved surface, so that in a contact area of ​​the recessed portion in contact with a protrusion embedded in the recessed portion among the plurality of protrusions, the interval between the inner side surfaces on both sides of the recessed portion gradually decreases toward the depth of the recessed portion, and each of the inner side surfaces has ridges protruding toward the inner space opposite to each other in the contact area; Each outer side surface of the convex portion is composed of a curved surface, so that in the contact area of ​​the convex portion with the concave portion when embedded in the concave portion, the interval between the outer side surfaces on both sides of the convex portion gradually decreases toward the front end portion of the convex portion, and the two outer side surfaces of the convex portion arranged opposite to each other are respectively used to contact the two ridges.

3. The circular blade according to claim 2, wherein each of the outer side surfaces is formed so that the cross-sectional area of ​​the protrusions parallel to the bottom surface gradually increases in a direction away from the bottom surface, and the bottom surface contacts the seating surface of the mounting seat.

4. The circular blade according to claim 3, wherein: Each of the outer side surfaces is formed as a part of a frustum of a cone.

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