CN118305343B - Indexable cutting tool - Google Patents
Indexable cutting tool Download PDFInfo
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- CN118305343B CN118305343B CN202410760294.1A CN202410760294A CN118305343B CN 118305343 B CN118305343 B CN 118305343B CN 202410760294 A CN202410760294 A CN 202410760294A CN 118305343 B CN118305343 B CN 118305343B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The invention discloses an indexable cutting tool, comprising: a cutter bar and a fastening screw which are provided with a cutter blade seat formed by the concave; the blade is mounted on the blade seat through a fastening screw and comprises a mounting part, a positioning part and a cutting part which are sequentially stacked, and the whole blade is in a table shape gradually shrinking from the cutting part to the mounting part; the insert seat comprises a first concave part, a second concave part and a third concave part which gradually shrink in a step shape from outside to inside, a screw hole is formed in the bottom surface of the third concave part, the depth of the screw hole is larger than that of the third concave part, and the screw hole is provided with a central axis; when the blade rotates around the central axis, the side surface of the mounting part does not interfere with the side wall of the second concave part, and the side surface of the positioning part does not interfere with the side wall of the first concave part. An indexable cutting tool in which a cutting portion can be quickly replaced with a more reliable structure of an insert clamping portion.
Description
Technical Field
The invention belongs to the field of machining tools, and particularly relates to an indexable cutting tool.
Background
In the field of metal cutting tools for turning, grooving, parting and threading operations, it has long been the intention to provide a suitable hard material with a cutting insert removably secured in an insert holder, i.e. a cemented carbide in such a way that the cutting operation is performed in the vicinity of the cutting edge, the insert holder being made of a material having a lower hardness.
Cutting tools of this type have been developed as indexable cutting inserts having a plurality of cutting edges, which provide a more stable and reliable way of securing the insert to the insert holder by cutting operations of a greater number of cutting edges to improve economy.
U.S. patent No.4169690 discloses an indexable insert for heavy loads, the insert having one or more cutting edges extending circumferentially from a central body portion; the insert is fixed at the recess of the cutter bar by the clamping wall from the side or the top; this makes the presence of the clamping wall more complex to the tool holder. No.5308197 discloses a machining method, a cutter bar having a recess on which a recess member is mounted to fix a blade; the blade has a mounting portion and a plurality of walls, the positioning surface of the mounting portion bearing against a pair of positioning surfaces of the recess; the recess makes the production and use of the device more complicated.
Disclosure of Invention
In view of the above-described drawbacks of the prior art, an object of the present invention is to provide an indexable cutting tool in which the insert clamping portion is structurally reliable and in which the cutting portion can be quickly replaced.
The present application provides an indexable cutting tool comprising:
one end of the cutter bar is provided with a cutter blade seat formed by recessing;
a fastening screw;
the blade is mounted on the blade seat through the fastening screw and comprises a mounting part, a positioning part and a cutting part which are sequentially stacked, and the whole blade is in a table shape gradually shrinking from the cutting part to the mounting part; wherein,
The cutting part is provided with a first plane and a connecting surface which are oppositely arranged;
The positioning part is arranged on the connecting surface and is provided with a second plane which is opposite to and parallel to the first plane;
The mounting part is arranged on the second plane and is provided with a third plane which is arranged opposite to and parallel to the second plane;
The insert seat comprises a first concave part, a second concave part and a third concave part which gradually shrink in a step shape from outside to inside, a screw hole is formed in the bottom surface of the third concave part, the depth of the screw hole is larger than that of the third concave part, and the screw hole is provided with a central axis; when the blade rotates around the central axis, the side surface of the mounting part does not interfere with the side wall of the second concave part, and the side surface of the positioning part does not interfere with the side wall of the first concave part.
Further, the cutter bar approximates a cuboid and comprises a first end face and a second end face which are respectively arranged along the axis of the cutter bar, and an included angle alpha of 78-89 degrees is formed between the first plane and the first end face. Preferably the angle alpha is equal to 82 deg. -85 deg..
Further, the cutter bar also comprises a top surface and a bottom surface which are oppositely arranged and parallel, and the first plane forms an included angle gamma of 80-89 degrees with the top surface. Preferably the angle γ is equal to 82 ° -85 °.
Further, the side surface of the mounting part comprises a plurality of mounting side surfaces, the corner part where the first end surface and the top surface meet is provided with a support column in a protruding mode relative to the bottom surface of the third concave part, one side of the support column facing the bottom surface of the third concave part is provided with a first support wall connected with one mounting side surface, and the side wall of the third concave part is also provided with a second support wall and a third support wall which are respectively connected with one mounting side surface and are arranged at intervals.
Further, the cutter bar further comprises a first side surface and a second side surface which are oppositely arranged and parallel, the insert seat is arranged at or near a corner part where the first side surface intersects with the top surface and the first end surface, is recessed from the first side surface to the second side surface, is closed in the directions of the second end surface and the bottom surface, and is open in the directions of the first end surface and the top surface.
Further, the first recess side wall is circular arc-shaped.
Further, the cutting part and the positioning part are approximately square, and the mounting part is regular octagon, as seen along the normal line of the third plane.
Further, the side surface of the cutting part comprises a plurality of cutting side surfaces, each cutting side surface comprises a first cutting concave part, a second cutting concave part and a straight flank surface, the bottoms of the first cutting concave part and the second cutting concave part are positioned on the inner side of the connecting line of the two cutting edges, most or most of the area of the flank surface is positioned on the outer side of the connecting line of the two cutting edges, and a certain included angle is formed between the flank surface and the connecting line of the two cutting edges on the outer side of the flank surface.
The improvement of the application brings the following advantages: the blade mounting and clamping part of the indexable cutting tool has a simple and reliable structure, and the cutting part can be replaced quickly without completely unscrewing the screw.
Drawings
FIG. 1 is an exploded view of an indexable cutting tool according to an embodiment of the application;
FIG. 2 is a schematic perspective view of a cutter bar according to an embodiment of the present application;
FIG. 3 is a schematic top view of a blade according to an embodiment of the present application;
FIG. 4 is a schematic side view of a blade according to an embodiment of the present application;
FIG. 5 is a schematic side view of an indexable cutting tool according to an embodiment of the application;
FIG. 6 is a cross-sectional view of A-A of FIG. 5;
FIG. 7 is a schematic view of another side of an indexable cutting tool according to an embodiment of the application;
Wherein, 3, the blade; 38. a mounting part; 39. a positioning part; 34. a cutting portion; 37. a mounting hole; 30. a first plane; 381. a connection surface; 33. cutting the side surface; 36a,36b,36c,36d: a cutting edge; 32. a second plane; 31. a third plane; 35. a side surface of the mounting portion; 35a,35b,35c,35d,35e,35f,35g,35h: a mounting side; 33c, first cutting recesses; 33a, a second cutting recess; 33b, a relief surface; 2. a cutter bar; 20. a top surface; 21. a bottom surface; 22. a first side; 23. a second side; 26. a first end face; 27. a second end face; 25. a blade seat; 29. a first concave portion; 28. a second concave portion; 24. a third recess; 291. a first concave portion bottom surface; 292. a first recess sidewall; 281. a second concave bottom surface; 282. a second recess sidewall; 241. a third concave portion bottom surface; 242. a third recess sidewall; 261. a support column; 262. a first support wall; 263. a second support wall; 264. a third support wall; 243. screw holes; 4. and (5) fastening a screw.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
When the indexable cutting insert needs to switch the cutting edge by rotation, the conventional common practice is to screw out the fastening screw by using a tool, detach the fastening screw and the insert from the insert holder after the fastening screw is separated from the screw hole; then, after the blade is rotated to a proper angle, the blade and the fastening screw are placed on the blade seat; finally, the fastening screw is screwed in, and the blade is fixed on the blade seat again through the mounting hole and the screw hole. This method requires complete removal of the fastening screw and blade, which is prone to falling and loss, and the reinstallation step is cumbersome and time consuming.
Referring to fig. 1-7, an indexable cutting tool 1 according to an embodiment of the present application includes a tool holder 2 and an indexable insert 3 mounted on the tool holder 2, and a fastening screw 4 for mounting the fixed insert 3.
As shown in fig. 3 and 4, the insert 3 includes a mounting portion 38, a positioning portion 39, and a cutting portion 34, which are stacked in this order, and a mounting hole 37 penetrating the middle portions of the mounting portion 38, the positioning portion 39, and the cutting portion 34. Specifically, the mounting portion 38, the positioning portion 39, and the cutting portion 34 are each flat, the entire blade 3 is formed in a stepped shape gradually increasing from top to bottom, the stepped shape is a pyramid shape or a truncated cone shape having an approximate shape without a tip, and the cross section thereof is an approximate trapezoid; with the mounting portion 38 at the top end and the smallest area; the positioning part 39 is positioned in the middle, the cutting part 34 is positioned at the bottom end, the area is maximum, and the mounting part 38 and the positioning part 39 are arranged in a step-by-step descending way from the cutting part 34.
As shown in fig. 4, the cutting portion 34 has an oppositely disposed connection surface 381 and a first plane 30, and the positioning portion 39 is disposed on the connection surface 381 and is connected to the cutting portion 34 through the connection surface 381; a side surface of the cutting portion extending between the connection surface 381 and the cutting bottom surface 21, the side surface of the cutting portion including a plurality of circumferentially arranged, interconnected cutting side surfaces 33; two adjacent cutting flanks 33 intersect to form cutting edges 36a,36b,36c,36d.
The positioning portion 39 has a second plane 32 disposed opposite and parallel to the first plane 30.
The mounting portion 38 is provided on the second plane 32 and is connected to the positioning portion 39 through the second plane 32, has a third plane 31 disposed opposite and parallel to the second plane 32, and a side surface 35 of the mounting portion extending between the second plane 32 and the third plane 31, the side surface 35 of the mounting portion including a plurality of mounting side surfaces 35a,35b,35c,35d,35e,35f,35g,35h, and the mounting side surfaces 35a,35b,35c,35d,35e,35f,35g,35h being circumferentially arranged and connected in sequence.
As shown in fig. 2, the cutter bar 2 is approximately rectangular and comprises a top surface 20 and a bottom surface 21 which are respectively oppositely arranged and parallel, a first side surface 22 and a second side surface 23 which are respectively oppositely arranged and parallel, and a first end surface 26 and a second end surface 27 which are respectively arranged along the axis X of the cutter bar; one end of the cutter bar 2 is provided with a cutter blade seat 25 which is formed by a stepped recess and matched with the cutter blade 3, and the cutter blade seat 25 comprises a first concave part 29, a second concave part 28 and a third concave part 24 which are gradually reduced from outside to inside; the first recess 29 includes a first recess bottom surface 291 and a first recess side wall 292, the second recess 28 includes a second recess bottom surface 281 and a second recess side wall 282, and the third recess 24 includes a third recess bottom surface 241 and a third recess side wall 242; wherein the first concave portion bottom surface 291, the second concave portion bottom surface 281, and the third concave portion bottom surface 241 are arranged in a stepwise manner from outside to inside. The insert 3 is mounted in the insert holder 25, specifically, the connecting surface 381 contacts the first recess bottom surface 291, the second plane 32 contacts the second recess bottom surface 281, the third plane 31 contacts the third recess bottom surface 241, and a portion of the mounting side surfaces 35a,35b,35c,35d,35e,35f,35g,35h contact the third recess side walls 242.
The bottom surface of the third concave part is provided with a screw hole, and the fastening screw is used for fixedly mounting the blade in the blade seat through the mounting hole and the screw hole. The depth of the screw hole is larger than that of the third concave part, and the screw hole is provided with a central axis B; when the insert rotates around the central axis B, the side surface of the mounting part does not interfere with the side wall of the second concave part, and the side surface of the positioning part does not interfere with the side wall of the first concave part. The depth of the application takes the central axis B as a reference system. The depth of the screw hole is greater than the depth of the third recess to such an extent that the fastening screw remains threadedly connected to the screw hole when the fastening screw is screwed out by a length equal to the depth of the third recess. For example, assuming the depth of the third recess is H, the fastening screw should remain threadedly connected to the screw hole when the fastening screw is screwed out by the length H.
The application method of the embodiment is as follows: when the insert needs to switch the cutting edge by rotation, firstly screwing the fastening screw out of the depth of a third concave part by using a tool; it should be noted that, since the depth of the screw hole is greater than the depth of the third recess, the fastening screw is not separated from the screw hole at this time, and the fastening screw is still in threaded connection with the screw hole; the blade is then raised to the highest point (the highest point of the blade being defined by the cap of the tightening screw) and simultaneously turned to the proper angle for the cutting edge to be available after installation; the blade is then reinstalled in the blade holder and finally the tightening screw is screwed in to re-secure the blade to the blade holder.
The cutting tool and the method provided by the embodiment enable the fastening screw and the blade not to be completely detached when the blade is indexed, prevent the blade and the fastening screw from dropping and losing, and enable the step of reinstalling the blade and the fastening screw to be simpler and quicker.
The insert is rotationally symmetrical about the central axis B.
The cutting side and the mounting side are both perpendicular to the first plane.
As an embodiment
The first plane 30 forms an angle alpha of 78 deg. -89 deg. with the second end surface 27.
The first plane 30 forms an angle gamma of 80 deg. -89 deg. with the top surface 20.
The cutting insert 3 is locked into the insert seat of the holder 2 by means of the tightening screw 4, forming an indexable cutting tool 1, i.e. the angle in the operating state of the indexable cutting tool 1 is obtained. In grooving, the included angle alpha=88°, gamma=88° of the cutter bar 2 is assumed to be 0 ° when the cutter moves radially to the workpiece, so that grooving can be successfully realized; during cutting, the included angle alpha=82°, gamma=88° of the cutter bar 2 is assumed to be unchanged, the main deflection angle of the obtained cutter is 6 °, when the cutter radially moves to cut off a workpiece, the size of the core part of the workpiece can be effectively controlled, and further, the core part can be controlled at which end is left.
As an embodiment
Specifically, as shown in fig. 2, the insert seat 25 is provided at or near a corner where the first side surface 22 intersects the top surface 20 and the first end surface 26, is recessed from the first side surface 22 toward the second side surface 23, is closed in the direction of the second end surface 27 and the bottom surface 21, is opened in the direction of the first end surface 26 and the top surface 20, and is configured such that the first recess side wall 292, the second recess side wall 282, and the third recess side wall 242 extend substantially in the direction of the second end surface 27 and the bottom surface 21, and the first recess bottom surface 291, the second recess bottom surface 281, and the third recess bottom surface 241 are configured to gradually descend from the first side surface 22 toward a corner where the second side surface 23 intersects the top surface 20 and the first end surface 26; so that the insert 3 mounted to the insert holder 25 protrudes outwardly with a cutting edge for cutting.
As shown in fig. 2 and 6, the corner where the first end surface 26 and the top surface 20 meet is protruded with a support column 261 with respect to the third recess bottom surface 241, the support column 261 has a first support wall 262 connected to one of the mounting side surfaces 35a,35b,35c,35d,35e,35f,35g,35h on the side facing the third recess bottom surface 241, and the third recess side wall 242 also has a second support wall 263 and a third support wall 264 spaced apart and connected to one of the mounting side surfaces 35a,35b,35c,35d,35e,35f,35g,35h, respectively. The support column 261 and the first support wall 262 may make the blade 3 less susceptible to damage. The support post 261, the first support wall 262 are not in contact with the insert 3, and the support post 261 can block chips from entering the insert seat 25 or striking the insert 3 when the cutting tool is in operation.
As shown in fig. 6, the first support wall 262, the second support wall 263 and the third support wall 264 are arranged in a triangle shape, i.e. the connection lines of the three forms a triangle shape.
As an embodiment
As shown in fig. 1 and 2, the first recess side wall 292 has a circular arc shape.
As shown in fig. 3, the cutting portion 34, the positioning portion 39, and the mounting portion 38 of the insert 3 are all symmetrical in shape both left and right and up and down as viewed from the normal direction of the third plane 31. Specifically, the cutting portion 34 approximates a square, each side of the square being a cutting side 33 of the cutting portion 34, the cutting edges 36a,36b,36c,36d being formed at opposite corners of the square, respectively; the positioning portion 39 is square or approximately square; the mounting portion 38 is regular or approximately regular octagonal; the mounting hole 37 is circular. Thus, the cutting portion 34 is formed with four peripheral Xiang Paibu end-to-end cutting sides 33 and four cutting edges 36a,36b,36c,36d, respectively; the mounting portions 38 are formed with eight circumferences Xiang Paibu and end to end, respectively the attached mounting sides 35a,35b,35c,35d,35e,35f,35g,35h.
As an embodiment
As shown in fig. 3, the cutting side surface 33 includes a first cutting recess 33c, a second cutting recess 33a, and a flat relief surface 33b.
As seen in the normal direction of the third plane 31, the bottoms of the first and second cutting recesses 33c, 33a are positioned inward of the line connecting the two cutting edges 36a,36b,36c,36d, and most or most of the area of the relief surface 33b is positioned outward of the line connecting the two cutting edges 36a,36b,36c,36d, with the relief surface 33b being at an angle to the line connecting the two cutting edges 36a,36b,36c,36d, based on the line connecting the two cutting edges 36a,36b,36c,36d, respectively, at both ends of the cutting side surface 33, as shown in fig. 3.
The first cutting recess 33c has a rake surface adjacent to the cutting edges 36a,36b,36c,36d, which is a flat surface.
A cutting side 33 and a mounting side 35, 35a,35b,35c,35d,35e,35f,35g,35h are perpendicular to a first plane 30 and a third plane 31.
The third recess bottom surface 241 is perpendicular to the third recess side walls 242.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. An indexable cutting tool, comprising:
one end of the cutter bar is provided with a cutter blade seat formed by recessing;
a fastening screw;
the blade is mounted on the blade seat through the fastening screw and comprises a mounting part, a positioning part and a cutting part which are sequentially stacked, and the whole blade is in a table shape gradually shrinking from the cutting part to the mounting part; wherein,
The cutting part is provided with a first plane and a connecting surface which are oppositely arranged;
The positioning part is arranged on the connecting surface and is provided with a second plane which is opposite to and parallel to the first plane;
The mounting part is arranged on the second plane and is provided with a third plane which is arranged opposite to and parallel to the second plane;
The insert seat comprises a first concave part, a second concave part and a third concave part which gradually shrink in a step shape from outside to inside, a screw hole is formed in the bottom surface of the third concave part, the depth of the screw hole is larger than that of the third concave part, and the screw hole is provided with a central axis; when the fastening screw is screwed out to a length equal to the depth of the third concave part, the fastening screw is still in threaded connection with the screw hole; when the blade rotates around the central axis, the side surface of the mounting part does not interfere with the side wall of the second concave part, and the side surface of the positioning part does not interfere with the side wall of the first concave part; the mounting part is in a regular octagon shape as seen along the normal line of the third plane;
The cutter bar comprises a first end face and a second end face which are respectively arranged along the axis of the cutter bar, and a top face and a bottom face which are oppositely arranged and parallel; the side face of the mounting part comprises a plurality of mounting side faces, the corner part where the first end face is intersected with the top face is opposite to the bottom face of the third concave part, a support column is protruded on the bottom face of the third concave part, one side of the support column facing the bottom face of the third concave part is provided with a first support wall connected with one mounting side face, and the side wall of the third concave part is also provided with a second support wall and a third support wall which are respectively connected with one mounting side face and are arranged at intervals.
2. The indexable cutting tool of claim 1 wherein the first plane forms an angle α of 78 ° to 89 ° with the first end surface.
3. An indexable cutting tool according to claim 2 wherein the first plane forms an angle γ with the top surface of 80 ° to 89 °.
4. The indexable cutting tool of claim 3 wherein the insert holder further comprises oppositely disposed and parallel first and second side surfaces, the insert seat being disposed at or near a corner of the first side surface intersecting the top and first end surfaces, being recessed from the first side surface toward the second side surface and being closed in the direction of the second end and bottom surfaces and being open in the direction of the first end and top surfaces.
5. The indexable cutting tool of any one of claims 1-4 wherein the first recess sidewall is arcuate.
6. An indexable cutting tool as claimed in any one of claims 1-4 wherein the cutting portion and the locating portion are approximately square when viewed along a normal to the third plane.
7. The indexable cutting tool of any one of claims 1-4 wherein the side surface of the cutting portion comprises a plurality of cutting side surfaces, the cutting side surfaces comprising a first cutting recess, a second cutting recess, and a flat relief surface, the bottoms of the first cutting recess and the second cutting recess being located inboard of the line of the two cutting edges, and a majority or a majority of the relief surface being located outboard of the line of the two cutting edges, the relief surface being at an angle to the line of the two cutting edges outboard thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410760294.1A CN118305343B (en) | 2024-06-13 | 2024-06-13 | Indexable cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410760294.1A CN118305343B (en) | 2024-06-13 | 2024-06-13 | Indexable cutting tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118305343A CN118305343A (en) | 2024-07-09 |
| CN118305343B true CN118305343B (en) | 2024-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410760294.1A Active CN118305343B (en) | 2024-06-13 | 2024-06-13 | Indexable cutting tool |
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| Country | Link |
|---|---|
| CN (1) | CN118305343B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1013365A1 (en) * | 1998-12-22 | 2000-06-28 | Plansee Tizit Aktiengesellschaft | Cutting tool |
| DE102016106684A1 (en) * | 2016-04-12 | 2017-10-26 | Kemmer Hartmetallwerkzeuge Gmbh | Carrier tool for inserts with multiple cutting edges |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL208826A (en) * | 2010-10-20 | 2016-02-29 | Iscar Ltd | Cutting tool and cutting insert therefor |
| EP2581157B1 (en) * | 2011-10-11 | 2020-04-01 | VARGUS Ltd. | Cutting tool for grooving and parting operations |
| CN212598936U (en) * | 2020-06-24 | 2021-02-26 | 济南浩恩精密机械有限公司 | Blade and turning tool with same |
-
2024
- 2024-06-13 CN CN202410760294.1A patent/CN118305343B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1013365A1 (en) * | 1998-12-22 | 2000-06-28 | Plansee Tizit Aktiengesellschaft | Cutting tool |
| DE102016106684A1 (en) * | 2016-04-12 | 2017-10-26 | Kemmer Hartmetallwerkzeuge Gmbh | Carrier tool for inserts with multiple cutting edges |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118305343A (en) | 2024-07-09 |
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