Assembly of a cutting insert and a tool holder
By designing a cutting insert with a constant primary cutting edge flank width and a prominent secondary cutting edge flank, combined with the concave portion of the tool holder and the locking claw structure, the problem of unstable installation of the cutting insert on the tool holder was solved, resulting in a more stable cutting process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KORLOY
- Filing Date
- 2021-08-30
- Publication Date
- 2026-07-07
AI Technical Summary
Existing cutting inserts are not easily mounted on tool holders and are prone to separation due to vibration and impact, affecting machining performance.
A cutting insert with a constant primary cutting edge flank width and a prominent secondary cutting edge flank, combined with a concave portion of the tool holder and a locking claw structure, is designed to ensure stable mounting of the cutting insert on the tool holder and prevent separation.
It improves the installation stability and machining performance of cutting inserts on the tool holder, reduces the risk of separation due to impact, and enhances the stability of the cutting process.
Smart Images
Figure CN116419812B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a cutting blade and an assembly of a tool holder fitted with the cutting blade. Background Technology
[0002] Typically, cutting inserts are mounted on cutting tools installed on machine tools and used to cut workpieces, such as machine parts made of ferrous, non-ferrous metals, and non-metallic materials.
[0003] This cutting insert includes an upper surface, a lower surface oriented in opposite directions, a side surface that joins the upper and lower surfaces together, and a cutting edge that forms the boundary between the upper and side surfaces, the cutting edge being essentially configured to cut the workpiece.
[0004] at the same time, Figure 10 and Figure 11 The cutting insert 1 disclosed in JP4810902B is shown. For reference, Figure 10 and Figure 11 Corresponding to JP4810902B respectively Figure 2 and Figure 3 For ease of description, the reference numerals used in JP4810902B are used without modification, and these reference numerals do not necessarily refer to the same parts even if they overlap with the reference numerals used in the following description of the invention.
[0005] In a positive-angle cutting insert, such as the related cutting insert 1, the area of the lower surface (bottom surface) of the cutting insert that contacts the tool holder is determined by the angle of the flank face. When such a positive-angle cutting insert is assembled onto a tool holder, the sharpness can be improved by increasing the clearance angle of the flank face of the secondary cutting edge by applying a larger setting angle in the positive angle direction. However, as the clearance angle increases, the lower surface (bottom surface) decreases, and the vibration generated during machining in environments with poor cutting conditions may not only damage the cutting insert but also adversely affect the workpiece.
[0006] Specifically, in the relevant cutting insert 1, such as Figure 10 As shown, the width of the first flank face 16a of the main cutting edge is not constant but varies. Therefore, the area of the second flank face 16b of the main cutting edge in contact with the cutting tool is reduced, resulting in decreased stability of the cutting insert when mounted on the tool holder.
[0007] Furthermore, in the relevant cutting insert 1, such as Figure 11 As shown, the flank face 16 of the secondary cutting edge is a single surface and the clearance angle is constant, thus reducing the area of the mounting surface 3 that contacts the tool holder, which leads to a decrease in the stability of the cutting insert when mounted on the tool holder. Summary of the Invention
[0008] Technical issues
[0009] The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a cutting insert that can be stably mounted on a tool holder even during the cutting process and can effectively prevent the cutting insert from separating from the tool holder due to the impact generated during the machining process, as well as an assembly of a tool holder equipped with the cutting insert.
[0010] Technical solution
[0011] To achieve the above objectives, a cutting insert according to an embodiment of the present invention may include an upper surface, a lower surface, a side surface, a cutting edge, and a mounting hole penetrating the upper and lower surfaces. The cutting edge may include a main cutting edge, a corner cutting edge extending from the main cutting edge, and a secondary cutting edge extending from the corner cutting edge. The side surface may include a main cutting edge flank face and a secondary cutting edge flank face. The main cutting edge flank face may include a first main cutting edge flank face extending from the main cutting edge and a second main cutting edge flank face extending from the lower surface. The secondary cutting edge flank face may include a first secondary cutting edge flank face extending from the secondary cutting edge and a second secondary cutting edge flank face extending from the lower surface. The first secondary cutting edge flank face and the second secondary cutting edge flank face may together form a stepped portion, and the second secondary cutting edge flank face may protrude relative to an imaginary plane extending from the first secondary cutting edge flank face.
[0012] In addition, a first locking pawl can be formed between the first and second secondary cutting edge flank faces through the stepped portion.
[0013] Furthermore, when the cutting insert is viewed toward the lower surface, the four enlarged support surfaces can be formed outside the line of intersection between the lower surface and the extended plane of the surface of the first secondary cutting edge rake face.
[0014] Furthermore, the width of the first primary cutting edge flank face from the upper surface to the lower surface can be constant.
[0015] An assembly may be provided that includes a cutting blade and a tool holder on which the cutting blade may be mounted, wherein the tool holder may include a groove therein for housing the cutting blade, the groove may include a first side mounting surface, a second side mounting surface, a recess positioned between the first side mounting surface and the second side mounting surface, and a bottom mounting surface, the recess may include a first recess in a direction away from the bottom mounting surface and a recessed portion that forms a step with the first recess and protrudes relatively further from an imaginary plane extending from the surface of the first recess, and the first recess and the recessed portion may form a second locking claw.
[0016] Furthermore, the second primary cutting edge flank face of the cutting insert can be supported on the first side mounting surface, the other secondary primary cutting edge flank face of the cutting insert can be supported on the second side mounting surface, the lower surface can be supported on the bottom mounting surface, and the first secondary cutting edge flank face can form a predetermined gap with the concave portion, wherein the first locking claw can protrude into the space formed in the first concave portion.
[0017] Beneficial effects
[0018] The cutting insert according to an embodiment of the present invention having the above-described structure has the following effects.
[0019] Because the second cutting edge flank protrudes further than the first cutting edge flank, even if the clearance angle of the first cutting edge flank increases, the area of the lower surface in contact with the tool holder will not decrease. Therefore, machining performance can be improved without sacrificing installation stability.
[0020] Furthermore, by keeping the width of the first primary cutting edge flank constant, it can be ensured that the second primary cutting edge flank contacts the tool holder with the largest possible area, thus improving the stability of the tool holder.
[0021] Furthermore, when the cutting insert is placed in the groove of the tool holder, the first set of cutting edge flanks forms a predetermined gap with the concave portion. At this time, the first locking claw of the cutting insert protrudes into the space formed in the first recess of the tool holder, so that when an impact from the cutting process is applied to the cutting insert during cutting, the first locking claw of the cutting insert contacts and is locked with the second locking claw of the tool holder, thereby preventing the cutting insert from separating from the bottom mounting surface of the groove.
[0022] At the same time, it goes without saying that the present invention includes other effects that, although not explicitly stated, can be expected from the above-described structure. Attached Figure Description
[0023] Figure 1 This is a perspective view of a cutting blade according to an exemplary embodiment of the present invention.
[0024] Figure 2 It is viewed from above. Figure 1 A view of the cutting blade.
[0025] Figure 3 This is observed from the direction of the flank face of the main cutting edge. Figure 1 Side view of the cutting blade.
[0026] Figure 4 This is observed from the direction of the flank face of the secondary cutting edge. Figure 1 Side view of the cutting blade.
[0027] Figure 5 It is observed from the bottom surface. Figure 1 A view of the cutting blade.
[0028] Figure 6 It shows Figure 1 Components of cutting blades and tool holders.
[0029] Figure 7 yes Figure 6 A magnified view of the groove of the tool holder.
[0030] Figure 8 It shows Figure 6 The component, in which the cutting blade is mounted on the groove.
[0031] Figure 9 This shows how torque is due to Figure 6 The view is reduced due to the cutting force in the components.
[0032] Figure 10 and Figure 11 An example of the relevant cutting insert is shown. Detailed Implementation
[0033] Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings, which will be apparent to those skilled in the art. However, it should be understood that the invention can be implemented in various other forms and should not be construed as limited to the specific examples described herein.
[0034] like Figure 1 As shown, a cutting insert 100 according to one embodiment of the present invention includes an upper surface 1, a lower surface 2, a side surface 3, a cutting edge 4, and a mounting hole 5 penetrating the upper surface 1 and the lower surface 2. When viewed from the upper surface 1, the cutting insert 100 of this embodiment has an approximately quadrilateral shape and is a single-sided cutting insert. Furthermore, it can be rotationally symmetrical about 180° with respect to an imaginary centerline C1 passing through the center of the mounting hole 5.
[0035] Furthermore, the cutting insert 100 is a positive angle cutting insert. For reference, "positive angle" means... Figure 4 The angle α formed between the extension of the lower surface P3 and the extension of the flank face P1 is an obtuse angle. In this case, angle α refers to the angle towards the upper surface of the cutting insert. Furthermore, a "negative angle" refers to a type where angle α is a right angle.
[0036] The cutting edge 4 includes a main cutting edge 41, a corner cutting edge 42 extending from the main cutting edge 41, and a secondary cutting edge 43 extending from the corner cutting edge 42.
[0037] The side surface 3 includes the main cutting edge rake face 31 and the secondary cutting edge rake face 33.
[0038] The main cutting edge rake face 31 includes a first main cutting edge rake face 311 extending from the main cutting edge 41 and a second main cutting edge rake face 312 extending from the lower surface 2.
[0039] The secondary cutting edge rake face 33 includes a first secondary cutting edge rake face 331 extending from the secondary cutting edge 43 and a second secondary cutting edge rake face 332 extending from the lower surface 2.
[0040] like Figure 1 and Figure 4 As shown, the first secondary cutting edge rake face 331 and the second secondary cutting edge rake face 332 together form a stepped portion, and the second secondary cutting edge rake face 332 protrudes relative to an imaginary plane P1 extending from the first secondary cutting edge rake face 331. A first locking pawl 333 is formed between the first secondary cutting edge rake face 331 and the second secondary cutting edge rake face 332 through this stepped portion.
[0041] In this way, because the second cutting edge flank 332 protrudes relatively further than the first cutting edge flank 331, such as Figure 5 As shown, when the cutting insert is viewed from the lower surface, compared to the relevant cutting insert, there are four enlarged support surfaces 21 located outside the intersection line L1 of the imaginary plane P1 and the lower surface 2. In this case, "outside the intersection line L1" refers to the surface located radially outside the intersection line L1 relative to the through hole 5. Thus, even if the clearance angle of the first secondary cutting edge flank 331 is increased, the contact area between the lower surface 2 and the tool holder will not decrease, thereby improving machining performance without sacrificing installation stability. Conversely, the problem with the relevant cutting insert is that when the clearance angle of the secondary cutting edge flank is increased to improve machining performance, the area of the lower surface is also reduced, resulting in poor installation stability.
[0042] At the same time, such as Figure 3 As shown, the width (w) of the first primary cutting edge flank 311 in the direction from the upper surface 1 to the lower surface 2 is constant. This ensures maximum contact area between the second primary cutting edge flank 312 and the tool holder, thereby improving stability when mounted on the tool holder. On the other hand, a problem with related cutting inserts is that the width of the primary cutting edge flank extending from the primary cutting edge increases from one direction to the other, thus reducing the contact area with the tool holder and resulting in poor stability when mounted on the tool holder (see [link to insert description]). Figure 10 ).
[0043] In the following text, reference will be made to Figures 6 to 9 The assembly described includes a cutting insert 100 and a tool holder 500 equipped with the cutting insert.
[0044] like Figure 6 and Figure 7 As shown, the tool holder (tool) 500 includes a groove 501 in which the cutting blade 100 is housed.
[0045] Specifically, the groove 501 includes a first side mounting surface 502, a second side mounting surface 503, a recess 504 positioned between the first side mounting surface 502 and the second side mounting surface 503, and a bottom mounting surface 505.
[0046] In this example, the recess 504 includes a first recess 5041 and a recessed portion 5042 respectively located in a direction away from the bottom mounting surface 505.
[0047] like Figure 8 As shown, the concave portion 5042 forms a step with the first concave portion 5041, and protrudes relatively further from the imaginary extending plane P2 of the surface of the first concave portion 5041. Thus, the first concave portion 5041 and the concave portion 5042 form the second locking claw 5043.
[0048] Meanwhile, the second primary cutting edge flank 312 of the cutting insert 100 is supported on the first side mounting surface 502, the other second primary cutting edge flank 312 of the cutting insert 100 is supported on the second side mounting surface 503, and the lower surface 2 is supported on the bottom mounting surface 505.
[0049] like Figure 8 As shown, with the cutting insert 100 positioned in the groove 501 of the tool holder 500, the first secondary cutting edge flank 331 forms a predetermined gap (a) with the concave portion 5042. At this time, the first locking claw 333 of the cutting insert 100 protrudes into the space S formed in the first concave portion 5041 of the tool holder 500. Therefore, when an impact from the cutting process is applied to the cutting insert during cutting, the first locking claw 333 of the cutting insert 100 contacts and is locked against the second locking claw 5043 of the tool holder 500, thereby preventing the cutting insert 100 from separating from the bottom mounting surface 505 of the groove 501.
[0050] In addition, such as Figure 9 As shown, for the cutting insert 100, the lower surface 2 is widened, thus reducing the torque (moment) generated by the cutting force F, thereby further increasing installation stability. For reference, in Figure 9 In the figure, L2 represents the vertical distance between the support point in the cutting insert and the cutting force F, and L1 represents the vertical distance between the support point in the cutting insert of the present invention and the cutting force F.
[0051] As described above, by utilizing the cutting insert and tool holder according to an embodiment of the present invention, it is ensured that the flank face of the second main cutting edge contacts the tool holder with the largest possible area to withstand the impact applied to the positive angle cutting insert during cutting. Furthermore, the construction of the first locking claw of the cutting insert and the second locking claw of the tool holder can prevent the cutting insert from falling off.
[0052] Although the invention has been described with reference to some examples herein, the invention should not be limited to these examples, and various other modifications and variations made by those skilled in the art based on the basic concepts of this disclosure are also within the scope of the appended claims.
[0053] Industrial applicability
[0054] This invention can be used as a cutting tool for cutting workpieces.
Claims
1. An assembly of a cutting blade and a tool holder, The cutting insert includes an upper surface, a lower surface, a side surface, a cutting edge, and a mounting hole penetrating the upper surface and the lower surface, wherein: The cutting edge includes a main cutting edge, a corner cutting edge extending from the main cutting edge, and a secondary cutting edge extending from the corner cutting edge. The side surface includes the primary cutting edge rake face and the secondary cutting edge rake face. The main cutting edge rake face includes a first main cutting edge rake face extending from the main cutting edge and a second main cutting edge rake face extending from the lower surface. The secondary cutting edge rake face includes a first secondary cutting edge rake face extending from the secondary cutting edge and a second secondary cutting edge rake face extending from the lower surface. The first and second secondary cutting edge rake faces together form a stepped portion. The second set of cutting edge rake faces protrudes relative to an imaginary plane extending from the first set of cutting edge rake faces, and A first locking pawl is formed between the first secondary cutting edge rake face and the second secondary cutting edge rake face by means of the stepped portion. The tool holder includes a groove therein where the cutting blade is housed, wherein: The groove includes a first side mounting surface, a second side mounting surface, a recess positioned between the first side mounting surface and the second side mounting surface, and a bottom mounting surface. The recess includes a first recess in a direction away from the bottom mounting surface and a recessed portion that forms a step relative to the first recess and protrudes relatively further from an imaginary plane extending from the surface of the first recess. The first recess and the concave surface form a second locking claw. The second primary cutting edge flank of the cutting insert is supported on the first side mounting surface, the other primary cutting edge flank of the cutting insert is supported on the second side mounting surface, and the lower surface is supported on the bottom mounting surface. The first secondary cutting edge has a predetermined gap with the concave portion, wherein the first locking claw protrudes into the space formed in the first concave portion.