A gradual spiral angle wave milled cutter blade and a milled cutter

Abstract

The utility model relates to machining tool technical field especially relates to a kind of gradually changing spiral angle corrugated milling insert and milling cutter.The milling insert includes insert main part, the top surface of insert main part has chip breaking boss, chip breaking boss includes the first chip breaking boss in the inner side of corrugated cutting edge and the second chip breaking boss in the inner side of end cutting edge, first chip breaking groove is formed between the first chip breaking boss and corrugated cutting edge, second chip breaking groove is formed between the second chip breaking boss and end cutting edge, first chip breaking groove and second chip breaking groove are communicated;The milling cutter includes milling insert and milling cutter bar, and the milling cutter bar includes cutter bar main body, and the cutter bar main body has spiral chip space and multiple blade mounting grooves for installing milling insert along the rotation direction of spiral chip space.The utility model effectively solves the technical problem that milling cutter cannot guide chip discharge in prior art, leading to the increase of cutting resistance, the reduction of cutting accuracy and the poor wear resistance of tool.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to a gradually helical corrugated milling insert and milling cutter. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling operations. During operation, each cutting tooth sequentially and intermittently removes the excess material from the workpiece. Milling cutters are mainly used on milling machines to machine planes, steps, grooves, shaped surfaces, and to cut off workpieces. Most existing milling cutters have flat rake faces and straight cutting edges, resulting in high cutting forces, severe tool wear, low tool life, low machining efficiency, and poor machining accuracy.

[0003] To address the aforementioned issues, patent application CN109604695A discloses a comb-shaped milling insert. This insert includes an insert body with a curved edge featuring a comb-shaped cutting edge. The projected curve of the comb-shaped cutting edge onto several surfaces is a power function curve. The insert body has a radial depth of wave, and a finishing edge is provided on the side of the comb-shaped cutting edge, with an arc-shaped ridge on the side where the finishing edge is located. This milling insert has a large radial depth of wave, meaning that during cutting, only a small portion of each cutting edge participates in the cutting process, with the unparticipated portion acting as a chip divider, making it easier for the insert to cut into the workpiece. Simultaneously, multi-point cutting increases the contact length between the cutting edge and the workpiece, and the axial forces generated on both sides of the cutting edge tip are balanced, effectively reducing machining resistance and heat during milling, decreasing tool wear, and extending tool life.

[0004] However, although the aforementioned tools can guide chip breakage and reduce single-edge cutting load by setting a large wave depth in the radial direction, they cannot guide chip discharge. This causes the chips to repeatedly rub against the rake face of the insert, increasing cutting resistance, causing cutting force fluctuations, triggering vibration, reducing machining accuracy and surface quality. Poor chip discharge can also cause cutting heat to accumulate near the tool tip, causing the tool temperature to rise sharply and reducing the tool's hardness and wear resistance. Utility Model Content

[0005] This utility model provides a gradually helical angle corrugated milling cutter insert to solve the technical problems in the prior art where the milling cutter cannot guide the chips out, resulting in increased cutting resistance, reduced cutting accuracy, and poor tool wear resistance; the purpose of this utility model is also to provide a milling cutter.

[0006] To solve the above problems, the gradient helical angle corrugated milling insert provided by this utility model adopts the following technical solution:

[0007] A gradually helical angle corrugated milling insert includes an insert body with a chip breaker boss on its top surface. The chip breaker boss includes a first chip breaker boss located inside the corrugated cutting edge and a second chip breaker boss located inside the end cutting edge. A first chip breaker groove is formed between the first chip breaker boss and the corrugated cutting edge, and a second chip breaker groove is formed between the second chip breaker boss and the end cutting edge. The first chip breaker groove and the second chip breaker groove are connected to each other for drawing out chips that fall into the first chip breaker groove and the second chip breaker groove.

[0008] The beneficial effects of the gradient helical angle corrugated milling cutter provided by this utility model are:

[0009] 1. By setting a chip-breaking boss on the top surface of the blade body, and the chip-breaking boss includes a first chip-breaking boss located inside the corrugated cutting edge and a second chip-breaking boss located inside the end cutting edge, the flow path of the chip can be changed by the chip-breaking boss, causing the chip to bend, fold or impact at the chip-breaking boss, resulting in stress concentration. When the stress exceeds the material strength, the chip breaks into short fragments, which can reduce the possibility of machining abnormalities caused by chip breaking.

[0010] 2. By forming a first chip breaker groove between the corrugated cutting edge and the first chip breaker boss, and a second chip breaker groove between the end cutting edge and the second chip breaker boss, and with the first and second chip breaker grooves connected, the first chip breaker groove can guide the chips generated by the corrugated cutting edge during operation to the chip breaker groove in a timely manner, and the second chip breaker groove can guide the chips generated by the end cutting edge during operation to the chip breaker groove in a timely manner. The first and second chip breaker grooves work together to efficiently discharge the chips to the chip breaker groove, avoiding chip accumulation, thereby avoiding the increase in chip resistance caused by chip accumulation, improving cutting accuracy and cutting efficiency, and preventing the reduction of insert life caused by chip-insert friction, ultimately improving the service life of the end mill.

[0011] Through the above-mentioned design, this utility model effectively solves the technical problems in the prior art where the milling cutter cannot guide the chips out, resulting in increased cutting resistance, reduced cutting accuracy, and poor tool wear resistance.

[0012] Furthermore, the projection of the blade body onto the horizontal plane is a parallelogram-like structure, which includes a first side, a second side, a third side, and a fourth side. The first side and the third side are arranged opposite each other, and both the first side and the second side are inclined outward from bottom to top. The second side and the fourth side are arranged opposite each other.

[0013] Furthermore, there are two corrugated cutting edges, which are located on the first side and the third side, respectively; there are two end cutting edges, which are located on the second side and the fourth side, respectively; the top surface of the insert body is provided with a first chip-breaking boss on the inner side of each corrugated cutting edge, and a second chip-breaking boss on the inner side of each end cutting edge.

[0014] Beneficial effects: By setting two oppositely arranged corrugated cutting edges and two oppositely arranged end cutting edges, double-edge cutting can be formed. When the cutting effect of the set of corrugated cutting edges and end cutting edges that are in direct contact with the workpiece decreases, the installation direction of the milling insert is changed so that the set of corrugated cutting edges and end cutting edges that are not in contact with the workpiece can continue to perform milling work. This realizes the double utilization of a milling insert and greatly reduces the cost of using milling inserts.

[0015] Furthermore, the back angle of the corrugated cutting edge is 6° to 14°, and the back angle increases spirally along the gradual helical angle of the corrugated cutting edge.

[0016] Beneficial effects: The clearance angle of the corrugated cutting edge increases spirally along the gradual helix angle of the corrugated cutting edge, so that the contact area between the cutting edge and the workpiece changes dynamically during the cutting process. The entry angle of each cutting edge changes gradually during cutting, avoiding multiple edges cutting under the same conditions, thereby dispersing the cutting force, reducing the instantaneous resistance peak, and improving cutting efficiency.

[0017] Furthermore, the first chip breaker groove is a corrugated chip breaker groove that matches the corrugated shape of the corrugated cutting edge; the second chip breaker groove is a spindle-shaped groove.

[0018] Furthermore, the rake angle of the corrugated cutting edge is 8° to 20°.

[0019] Furthermore, the side of the first chip-breaking boss that connects to the top of the corrugated cutting edge is an arc surface, and the first chip-breaking groove is formed between the arc surface and the corrugated cutting edge.

[0020] To solve the above problems, the end mill provided by this utility model adopts the following technical solution:

[0021] A milling cutter includes a milling insert and a milling cutter shank. The bottom of the milling insert has a positioning reference platform. The milling cutter shank includes a shank body with a helical chip groove and a plurality of insert mounting slots arranged along the helical direction of the helical chip groove for mounting the milling insert. The helix angle of the helical chip groove is 3° to 12°. The milling insert is the aforementioned gradually helical angle corrugated milling insert.

[0022] A graduated helical angle corrugated milling insert includes an insert body. The top surface of the insert body has a chip breaker boss. The chip breaker boss includes a first chip breaker boss located inside the corrugated cutting edge and a second chip breaker boss located inside the end cutting edge. A first chip breaker groove is formed between the first chip breaker boss and the corrugated cutting edge, and a second chip breaker groove is formed between the second chip breaker boss and the end cutting edge. The first chip breaker groove and the second chip breaker groove are connected to each other to remove chips that fall into the first chip breaker groove and the second chip breaker groove.

[0023] The beneficial effects of the milling cutter provided by this utility model are:

[0024] 1. By setting a chip-breaking boss on the top surface of the blade body, and the chip-breaking boss includes a first chip-breaking boss located inside the corrugated cutting edge and a second chip-breaking boss located inside the end cutting edge, the flow path of the chip can be changed by the chip-breaking boss, causing the chip to bend, fold or impact at the chip-breaking boss, resulting in stress concentration. When the stress exceeds the material strength, the chip breaks into short fragments, which can reduce the possibility of machining abnormalities caused by chip breaking.

[0025] 2. By forming a first chip breaker groove between the corrugated cutting edge and the first chip breaker boss, and a second chip breaker groove between the end cutting edge and the second chip breaker boss, and the first chip breaker groove and the second chip breaker groove are connected, the chips generated by the corrugated cutting edge during operation can be guided to the chip breaker groove in a timely manner through the first chip breaker groove, and the chips generated by the end cutting edge during operation can be guided to the chip breaker groove in a timely manner through the second chip breaker groove. The first chip breaker groove and the second chip breaker groove work together to efficiently discharge the chips to the chip breaker groove, avoiding chip accumulation, thereby avoiding the increase in chip resistance caused by chip accumulation, improving cutting accuracy and cutting efficiency, while preventing the reduction of insert life caused by chip friction with the insert, and ultimately improving the service life of the milling cutter;

[0026] 3. By setting a helical chip groove on the tool holder body and setting multiple insert mounting slots on the tool holder body along the direction of the helical chip groove, the helix angle of the helical chip groove is 3° to 12°. This allows the cutting edges of multiple milling inserts to form a near-helical cutting edge. During cutting, the cutting force can be evenly distributed, avoiding excessive local force, effectively reducing the cutting force, making the tool run more smoothly and steadily, reducing energy loss, and thus improving cutting efficiency.

[0027] Through the above-mentioned design, this utility model effectively solves the technical problems in the prior art where the milling cutter cannot guide the chips out, resulting in increased cutting resistance, reduced cutting accuracy, and poor tool wear resistance.

[0028] Furthermore, the spiral chip groove is provided with a water outlet for cooling the milling cutter.

[0029] Beneficial effects: By setting water outlet holes on the milling cutter shank, the cutting edge of the milling cutter insert can be aligned and effectively cooled to delay high-temperature wear of the cutting edge, thereby increasing the service life of the milling cutter.

[0030] Furthermore, the bottom surface of the positioning reference platform has a downwardly protruding blade auxiliary mounting boss, and the blade mounting groove has a groove that matches the blade auxiliary mounting boss.

[0031] Beneficial effects: By setting an auxiliary mounting boss for the cutting insert on the positioning reference platform and a groove matching the auxiliary mounting boss in the cutting insert mounting slot, the alignment of the milling insert is facilitated, thereby assisting in the installation of the cutting insert; at the same time, the fit between the auxiliary mounting boss and the groove ensures that the milling insert will not fall off even if the milling insert is not fixed in the cutting insert mounting slot with locking screws.

[0032] Furthermore, the projection of the blade body onto the horizontal plane is a parallelogram-like structure, which includes a first side, a second side, a third side, and a fourth side. The first side and the third side are arranged opposite each other, and both the first side and the second side are inclined outward from bottom to top. The second side and the fourth side are arranged opposite each other.

[0033] Furthermore, there are two corrugated cutting edges, which are located on the first side and the third side, respectively; there are two end cutting edges, which are located on the second side and the fourth side, respectively; the top surface of the insert body is provided with a first chip-breaking boss on the inner side of each corrugated cutting edge, and a second chip-breaking boss on the inner side of each end cutting edge.

[0034] Furthermore, the back angle of the corrugated cutting edge is 6° to 14°, and the back angle increases spirally along the gradual helical angle of the corrugated cutting edge.

[0035] Furthermore, the first chip breaker groove is a corrugated chip breaker groove that matches the corrugated shape of the corrugated cutting edge; the second chip breaker groove is a spindle-shaped groove.

[0036] Furthermore, the rake angle of the corrugated cutting edge is 8° to 20°.

[0037] Furthermore, the side of the first chip-breaking boss that connects to the top of the corrugated cutting edge is an arc surface, and the first chip-breaking groove is formed between the arc surface and the corrugated cutting edge. Attached Figure Description

[0038] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0039] Figure 1 A schematic diagram of the structure of the gradient helical angle corrugated milling cutter provided by this utility model;

[0040] Figure 2 This is a front view of the gradient helical angle corrugated milling insert provided by this utility model;

[0041] Figure 3 This is a side view of the gradient helical angle corrugated milling insert provided by this utility model;

[0042] Figure 4 A bottom view of the gradually helical angle corrugated milling insert provided by this utility model;

[0043] Figure 5 This is a schematic diagram of the structure of the milling cutter provided by this utility model;

[0044] Figure 6 This is a schematic diagram of the structure of the milling cutter bar provided by this utility model.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Blade body; 2. Corrugated cutting edge; 3. First chip breaker boss; 4. End cutting edge; 5. Second chip breaker boss; 6. First chip breaker groove; 7. Second chip breaker groove; 8. First side surface; 9. Second side surface; 10. Mounting hole; 11. Positioning reference platform; 12. Spiral chip groove; 13. Blade mounting groove; 14. Water outlet; 15. Blade auxiliary mounting boss; 16. Groove; 17. Locking screw; 18. Tool holder; 19. Blade boss reinforcing rib; 20. Rake angle of the cutting edge; 21. Rake angle of the cutting edge. Detailed Implementation

[0047] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0048] Embodiments of the gradient helical corrugated milling insert provided by this utility model:

[0049] like Figures 1 to 3As shown, the graduated helical angle corrugated milling insert includes an insert body 1. The top surface of the insert body 1 has a chip breaker boss. The chip breaker groove includes a first chip breaker boss 3 located inside the corrugated cutting edge 2 and a second chip breaker boss 5 located inside the end cutting edge 4. A first chip breaker groove 6 is formed between the first chip breaker boss 3 and the corrugated cutting edge 2, and a second chip breaker groove 7 is formed between the second chip breaker boss 5 and the end cutting edge 4. The first chip breaker groove 6 and the second chip breaker groove 7 are connected to each other to draw out the chips that fall into the first chip breaker groove 6 and the second chip breaker groove 7.

[0050] The corrugated cutting edge 2 and the end cutting edge 4 are arranged adjacent to each other; the first chip breaker groove 6 is a corrugated chip breaker groove that matches the shape of the corrugated cutting edge 2, and the second chip breaker groove 7 is a spindle-shaped groove.

[0051] In this embodiment, as Figure 2 As shown, the projection of the blade body 1 onto the horizontal plane is a parallelogram-like structure, which includes a first side 8, a second side 9, a third side, and a fourth side; wherein, the first side 8 and the third side are arranged in parallel and opposite directions, and both the first side 8 and the second side 9 are inclined outward from bottom to top; the second side 9 and the fourth side are arranged in parallel and opposite directions.

[0052] In this embodiment, there are two corrugated cutting edges 2 and two end cutting edges 4. The two corrugated cutting edges 2 are located on the first side 8 and the third side, respectively, and the two end cutting edges 4 are located on the second side 9 and the fourth side, respectively. The top surface of the insert body 1 is provided with a first chip breaking boss 3 on the inner side of each corrugated cutting edge 2, and a second chip breaking boss 5 is provided on the inner side of each end cutting edge 4.

[0053] In this embodiment, as Figure 2 and Figure 3 As shown, the blade body 1 has a mounting hole 10, and the projection of the blade body 1 on the horizontal plane is a centrally symmetrical figure about the center of the mounting hole 10.

[0054] In this embodiment, as Figure 3 As shown, the rake angle 21 of the corrugated cutting edge 2 is 8° to 20°.

[0055] In this embodiment, the clearance angle 20 of the corrugated cutting edge 2 is 6° to 14°, and the clearance angle 20 increases spirally along the gradual helix angle of the corrugated cutting edge 2. The helix angle is the acute angle between the tangent of the cylindrical helix on the cylindrical surface and the straight generatrix of the cylindrical surface passing through the point of tangency. In this embodiment, the helix angle refers to the angle between the tangent of the helix of the corrugated cutting edge 2 on the cylindrical surface and the axis of the milling cutter. The gradual helix angle means that the helix angle gradually increases from the upper end to the lower end of the milling insert. The spiral increase means that the clearance angle 20 increases as the gradual helix angle of the corrugated cutting edge 2 increases.

[0056] The working principle of the gradient helical angle corrugated milling insert provided by this utility model is as follows: When the milling insert is working, the set of corrugated cutting edges 2 and end cutting edges 4 in contact with the workpiece perform milling. The chips generated during the milling process are broken into short fragments under the action of the first chip breaking boss 3 and the second chip breaking boss 5, and then enter the first chip breaking groove 6 and the second chip breaking groove 7. Afterwards, under the guidance of the first chip breaking groove 6 and the second chip breaking groove 7, they enter the chip receiving groove. When the milling effect of the set of corrugated cutting edges 2 and end cutting edges 4 in contact with the workpiece decreases, the installation direction of the milling insert is changed so that the set of corrugated cutting edges 2 and end cutting edges 4 that are not in contact with the workpiece can continue to perform milling work.

[0057] Embodiments of the milling cutter provided by this utility model:

[0058] like Figures 3 to 6 As shown, the milling cutter includes a milling insert and a milling cutter shank. The bottom of the milling insert has a positioning reference platform 11, which includes four adjacent sides that serve as positioning reference surfaces.

[0059] In this embodiment, as Figure 5 and Figure 6 As shown, the milling cutter bar includes a cutter bar body, which includes a cutter holder 18. The cutter bar body has a helical chip groove 12 and multiple insert mounting slots 13 arranged along the helical direction of the helical chip groove 12 for mounting milling inserts. The helix angle of the helical chip groove 12 is 3° to 12°, so that after the milling inserts are installed in the insert mounting slots 13, the corrugated cutting edges 2 of the multiple milling inserts form a helix.

[0060] In this embodiment, the milling cutter has the same structure as the aforementioned gradually helical angle corrugated milling cutter, and will not be described again here.

[0061] In this embodiment, as Figure 5 and Figure 6 As shown, the spiral chip groove 12 is provided with a water outlet 14 for cooling the milling cutter.

[0062] In this embodiment, as Figure 4 and Figure 6 As shown, the bottom surface of the positioning reference platform 11 has a downwardly protruding insert auxiliary mounting boss 15, and the insert mounting groove 13 has a groove 16 that matches the insert auxiliary mounting boss 15, so as to assist the positioning reference platform 11 in the insert mounting groove 13, thereby realizing the installation of the milling insert in the insert mounting groove 13; at the same time, the fit between the insert auxiliary mounting boss 15 and the groove 16 ensures that the milling insert will not fall off even if the locking screw 17 is not used to fix the milling insert in the insert mounting groove 13.

[0063] In this embodiment, as Figure 3As shown, the bottom of the milling cutter has arc-shaped reinforcing ribs 19 around its perimeter. The arc shape of the reinforcing ribs 19 is used to increase the cutting strength of the milling cutter.

[0064] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "back," "horizontal," "top," "bottom," and "inner," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0065] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A gradually helical angle corrugated milling insert, comprising an insert body, characterized in that, The top surface of the insert body has a chip breaker boss, which includes a first chip breaker boss located inside the corrugated cutting edge and a second chip breaker boss located inside the end cutting edge. A first chip breaker groove is formed between the first chip breaker boss and the corrugated cutting edge, and a second chip breaker groove is formed between the second chip breaker boss and the end cutting edge. The first chip breaker groove and the second chip breaker groove are connected to each other to draw out the chips that fall into the first chip breaker groove and the second chip breaker groove.

2. The gradually helical angle corrugated milling insert according to claim 1, characterized in that, The projection of the blade body on the horizontal plane is a parallelogram-like structure, which includes a first side, a second side, a third side, and a fourth side. The first side and the third side are arranged opposite each other, and both the first side and the second side are inclined outward from bottom to top. The second side and the fourth side are arranged opposite each other.

3. The gradually helical angle corrugated milling insert according to claim 2, characterized in that, The number of corrugated cutting edges is two, and the two corrugated cutting edges are located on the first side and the third side, respectively; the number of end cutting edges is two, and the two end cutting edges are located on the second side and the fourth side, respectively; the top surface of the insert body is provided with a first chip breaking boss on the inner side of each corrugated cutting edge, and a second chip breaking boss is provided on the inner side of each end cutting edge.

4. The variable helix angle flute mill insert according to any one of claims 1 to 3, wherein, The back angle of the corrugated cutting edge is 6° to 14°, and the back angle increases spirally along the gradual helix angle of the corrugated cutting edge.

5. The variable helix angle flute mill insert according to any one of claims 1 to 3, wherein, The first chip breaker groove is a corrugated chip breaker groove that matches the corrugated shape of the corrugated cutting edge; the second chip breaker groove is a spindle-shaped groove.

6. The variable helix angle flute mill insert according to any one of claims 1 to 3, wherein, The rake angle of the corrugated cutting edge is 8° to 20°.

7. The gradually helical angle corrugated milling insert according to claim 6, characterized in that, The side of the first chip-breaking boss that connects to the top of the corrugated cutting edge is an arc surface, and the arc surface and the corrugated cutting edge form the first chip-breaking groove.

8. A milling cutter comprising a milling blade and a milling cutter bar, the bottom of the milling blade having a positioning reference table, characterized in that, The milling cutter insert is a gradually helical angle corrugated milling cutter insert as described in any one of claims 1 to 7. The milling cutter shank includes a shank body, the shank body having a helical chip groove and a plurality of insert mounting slots for mounting the milling cutter insert arranged along the helical direction of the helical chip groove. The helical angle of the helical chip groove is 3° to 12°.

9. The milling cutter according to claim 8, characterized in that The spiral chip groove is provided with a water outlet for cooling the milling cutter.

10. The milling cutter according to claim 8, characterized in that The bottom surface of the positioning reference platform has a downward-protruding blade auxiliary mounting boss, and the blade mounting groove has a groove that matches the blade auxiliary mounting boss.

Images