Indexable cutting insert

Abstract

The invention discloses an indexable cutting blade, and belongs to the technical field of cutting blades for metal cutting. The indexable cutting blade comprises a cutting edge and a chip reversing table. The cutting edge is formed at the boundary of the end face and the side face of the indexable cutting blade and comprises a side cutting edge and a corner cutting edge connected to the intersection of the side cutting edge; the chip reversing table is formed on the end face, and the chip reversing table is connected with the cutting edge through a groove-shaped bottom face, a slope face and an edge face which are sequentially formed on the end face; the side chip reversing tables are opposite to the side cutting edges and are formed by linearly arranging a plurality of hyperboloid lug bosses, and the corner chip reversing tables are connected to the intersections of the side chip reversing tables. The indexable cutting blade has the advantages of being smaller in chip contact area, smaller in cutting force and lower in generated heat, meanwhile, the requirements for curling and breaking of chips with small feeding and large cutting depth and large feeding and large cutting depth can be met, and the machined surface of a workpiece cannot be scratched by the chips.

Description

Technical Field

[0001] The invention relates to the technical field of cutting inserts for metal cutting, and in particular to an indexable cutting insert. Background Art

[0002] The metal cutting process is the process of interaction between the workpiece and the tool. When cutting medium processing, it is often accompanied by problems such as large cutting force, high cutting heat, short tool life, and poor control of chip curling. Especially when cutting low-carbon steel, chip curling and breaking are difficult to control. In addition, when cutting with small feed and large depth of cut, chip curling is more difficult to break, which is easy to form messy chips, scratch the processed surface, and is not conducive to chip cleaning. The current indexable cutting inserts are difficult to adapt to both small feed and large depth of cut and large feed and large depth of cut chip curling and breaking. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an indexable cutting insert having the advantages of smaller chip contact area, smaller cutting force, and lower heat generation, while being able to meet the requirements of small feed and large cutting depth and large feed and large cutting depth chip curling and breaking, and the chips will not scratch the processed surface of the workpiece.

[0004] An indexable cutting insert according to an embodiment of the present invention comprises: A cutting edge, the cutting edge being formed at a boundary between an end face and a side face of the indexable cutting insert and comprising a side cutting edge and a corner cutting edge connected to an intersection of the side cutting edges; A chip counter, wherein the chip counter is formed on the end surface, and the chip counter is connected to the cutting edge via a groove bottom surface, a slope surface and an edge surface sequentially formed on the end surface; the chip counter comprises a side chip counter formed by a plurality of hyperbolic protrusions arranged linearly opposite to the side cutting edge, and a corner chip counter connected to the intersection of the side chip counter.

[0005] The indexable cutting insert of the embodiment of the present invention has the following advantages: by providing the side chip return table formed by a plurality of the hyperbolic protrusions arranged linearly, during cutting processing, when the feed is small and the cutting depth is large, the chips flow through one of the curved protrusions of the hyperbolic protrusions of the side chip return table to be curled and broken, and compared with the traditional indexable cutting insert, the chip contact area is smaller, the cutting force is smaller, and the heat generated is lower; similarly, when the feed is large and the cutting depth is large, the chips flow through the other curved protrusion of the hyperbolic protrusion of the side chip return table to be curled and broken, and compared with the traditional indexable cutting insert, the chip contact area is smaller, the cutting force is smaller, and the heat generated is lower; therefore, the indexable cutting tool of the embodiment of the present invention can simultaneously meet the chip curling and breaking requirements of small feed and large cutting depth and large feed and large cutting depth. During the cutting process, the side chip reversal table can make the chips curl away from the workpiece and curl towards the unmachined surface, thereby preventing the chips from scratching the machined surface and ensuring the quality of the machined surface of the workpiece.

[0006] In some embodiments, the side chip counter is sloped on the side facing the corresponding side cutting edge; the side chip counter has a first end and a second end in the direction of the linear arrangement, the first end is connected to the corner chip counter, the second end is away from the corner chip counter, and the distance between the second end and the corresponding side cutting edge is greater than the distance between the first end and the corresponding side cutting edge.

[0007] In some embodiments, the heights of the plurality of hyperbolic protrusions in the linear arrangement direction are consistent.

[0008] In some embodiments, each of the hyperbolic protrusions includes a first curved protrusion and a second curved protrusion, the first curved protrusion is located lower than the second curved protrusion, and the first curved protrusion is connected to the second curved protrusion via a transition concave portion.

[0009] In some embodiments, a radius of curvature of the first curved protrusion is smaller than a radius of curvature of the second curved protrusion.

[0010] In some embodiments, the first curved surface protrusion is connected to the groove bottom surface via a connecting concave portion.

[0011] In some embodiments, the curvature radius of the transition concave portion is RC, 0.2 mm≤RC≤0.5 mm; the curvature radius of the connection concave portion is RD, 0.2 mm≤RD≤0.5 mm.

[0012] In some embodiments, in the height direction, the edge surface is lower than the side chip countertop, and at the same time, the edge surface is lower than the first curved surface protrusion, and the groove bottom surface is lower than the edge surface.

[0013] In some embodiments, the first curved surface tangent line tangent to the first curved surface convex part is made with the intersection point where the first curved surface convex part intersects with the horizontal direction of the groove bottom surface as the tangent point, and the angle between the first curved surface tangent line and the horizontal direction is B; the second curved surface tangent line tangent to the second curved surface convex part is made with the intersection point where the first curved surface convex part intersects with the second curved surface convex part as the tangent point, and the angle between the second curved surface tangent line and the horizontal direction is C, wherein 30°≤B <C≤50°。

[0014] In some embodiments, in the linear arrangement direction and in a direction gradually away from the corner chip reversing platform, the spacing between adjacent hyperbolic protrusions gradually increases, and the depth of the recesses between adjacent hyperbolic protrusions gradually increases.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A schematic diagram of an indexable cutting tool according to an embodiment of the present invention; Figure 2 It is a partial enlarged schematic diagram of an indexable cutting tool according to an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross section at NN in the middle; Figure 4 for Figure 2 Schematic diagram of the cross section at MM.

[0017] Reference numerals: Indexable cutting insert 1000; cutting edge 1; side cutting edge 101; corner cutting edge 102; chip counter 2; side chip counter 201; corner chip counter 202; hyperbolic raised portion 2011; first curved raised portion 2011a; second curved raised portion 2011b; transition concave portion 2011c; connecting concave portion 2011d; concave portion 2011e; first curved tangent L1; second curved tangent L2; end face 3; side face 4; groove bottom face 5; slope face 6; edge face 7; center mounting hole 8. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] Combine the following Figures 1 to 4 An indexable cutting insert 1000 according to an embodiment of the present invention will be described.

[0020] like Figures 1 to 4 As shown, the indexable cutting insert 1000 according to the embodiment of the present invention comprises a cutting edge 1 and a chip removal platform 2 .

[0021] The cutting edge 1 is formed at the boundary between the end face 3 and the side face 4 of the indexable cutting insert 1000 , and includes a side cutting edge 101 and a corner cutting edge 102 connected to the intersection of the side cutting edges 101 .

[0022] The chip counter 2 is formed on the end face 3, and the chip counter 2 is connected to the cutting edge 1 through the groove bottom surface 5, the ramp surface 6 and the edge surface 7 sequentially formed on the end face 3, so that during cutting, the chips flow through the edge surface 7, the ramp surface 6, the groove bottom surface 5, the side chip counter 201, are curled and broken through the chip counter 2. The chip counter 2 includes a side chip counter 201 formed by a plurality of hyperbolic protrusions 2011 arranged linearly opposite to the side cutting edge 101, and a corner chip counter 202 connected to the intersection of the side chip counter 201, so that during cutting, when the feed is small and the cutting depth is large, the chips flow through a curved protrusion of the hyperbolic protrusion 2011 (refer to the first curved protrusion 2011a below for curling and breaking), and the chip contact area is smaller than that of a conventional indexable cutting insert. , the cutting force is smaller, and the heat generated is lower. Similarly, when the feed is large and the cutting depth is large, the chips flow through another curved protrusion of the hyperboloid protrusion 2011 (refer to the second curved protrusion 2011b below for curling and breaking), and compared with the traditional indexable cutting blade, the chip contact area is smaller, the cutting force is smaller, and the heat generated is lower. Therefore, the indexable cutting blade 1000 of the embodiment of the present invention can simultaneously meet the requirements of small feed and large cutting depth and large feed and large cutting depth chip curling and breaking. During the cutting process, the setting of the side chip reversing platform 201 can make the chip curl in the direction away from the workpiece and curl in the direction of the unprocessed surface, so as to avoid the chips scratching the processed surface and ensure the quality of the processed surface of the workpiece.

[0023] It should be noted that the end surface 3 of the indexable cutting insert 1000 of the embodiment of the present invention also has a central mounting hole 8, which facilitates the installation of the indexable cutting insert 1000 on the tool rod.

[0024] The indexable cutting insert 1000 of the embodiment of the present invention has the following advantages: by providing a side chip return table 201 formed by a plurality of hyperbolic protrusions 2011 arranged linearly, during cutting processing, when the feed is small and the cutting depth is large, the chips flow through one of the curved protrusions of the hyperbolic protrusions 2011 (see the first curved protrusion 2011a below) to be curled and broken, and compared with the conventional indexable cutting inserts, the chip contact area is smaller, the cutting force is smaller, and the heat generated is lower. Similarly, when the feed is large and the cutting depth is large, the chips flow through the other curved protrusion of the hyperbolic protrusion 2011 (see the second curved protrusion 2011b below) to be curled and broken, and compared with the conventional indexable cutting inserts, the chip contact area is smaller, the cutting force is smaller, and the heat generated is lower. Therefore, the indexable cutting insert 1000 of the embodiment of the present invention can simultaneously meet the chip curling and breaking requirements of small feed and large cutting depth and large feed and large cutting depth. During the cutting process, the side chip reversal table 201 can make the chips curl away from the workpiece and curl towards the unprocessed surface, thereby preventing the chips from scratching the processed surface and ensuring the quality of the processed surface of the workpiece.

[0025] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the side chip counter 201 is sloped on the side facing the corresponding side cutting edge; the side chip counter 201 has a first end and a second end in the direction of linear arrangement, the first end is connected to the corner chip counter 202, the second end is away from the corner chip counter 202, and the distance between the second end and the corresponding side cutting edge 101 is greater than the distance between the first end and the corresponding side cutting edge 101, that is, there is a certain angle A between the side chip counter 201 and the corresponding side cutting edge 101. As a result, the chip space is greatly improved, which is suitable for when the cutting depth changes, a larger chip space is required for a larger cutting depth, and a larger chip curling is used to break the chip. At the same time, the chip curling direction is away from the workpiece and curled toward the unprocessed surface, so as to avoid the chip scratching the processed surface and ensure the quality of the processed surface of the workpiece.

[0026] Furthermore, the angle A between the side chip counter 201 and the corresponding side cutting edge 101 is an acute angle, and the range of the angle A between the side chip counter 201 and the side cutting edge 101 is: 15°≤A≤25°, preferably, the angle A is 20°. Thus, the chip space is greatly improved, which is suitable for when the cutting depth changes, a larger chip space is required for a larger cutting depth, and a larger chip curling is used to break the chip. At the same time, the chip curling direction is away from the workpiece and curled toward the unprocessed surface, so as to avoid the chip scratching the processed surface and ensure the quality of the processed surface of the workpiece.

[0027] In some embodiments, Figure 4As shown, the heights of multiple hyperbolic convex portions 2011 are consistent in the linear arrangement direction. During machining, the chip contact area is smaller, the cutting force is smaller, the heat generated is lower, and at the same time, it can meet the requirements of small feed and large cutting depth and large feed and large cutting depth for chip curling and breaking.

[0028] In some embodiments, such as Figure 2 and Figure 3 As shown, each hyperbolic convex portion 2011 includes a first curved convex portion 2011a and a second curved convex portion 2011b. The position of the first curved convex portion 2011a is lower than that of the second curved convex portion 2011b, and the first curved convex portion 2011a and the second curved convex portion 2011b are connected by a transition concave portion 2011c.

[0029] During machining, the chip flows through the flank face 7, the ramp face 6, the bottom face of the groove 5, and the side chip breaker 201 for curling and breaking. Figure 3 Shows a cross-section of a hyperbolic convex portion 2011 in the curved chip breaker 2, which is divided into a first curved convex portion 2011a and a second curved convex portion 2011b. When the feed is small and the cutting depth is large, the chip flows through the first curved convex portion 2011a for curling and breaking. Since the first curved convex portion 2011a is a curved convex structure, the chip curling contact area is smaller, the cutting heat generated is lower, and at the same time, the cutting force is smaller, thereby improving the life of the indexable cutting insert 1000. When the feed increases, the chip mainly flows through the second curved convex portion 2011b for curling and breaking. In addition to the aforementioned advantages, the transition concave portion 2011c between the first curved convex portion 2011a and the second curved convex portion 2011b has the effect of strengthening chip breaking.

[0030] In some embodiments, the radius of curvature of the first curved convex portion 2011a is smaller than that of the second curved convex portion 2011b, that is, the radius of curvature of the first curved convex portion 2011a is RA, and the radius of curvature of the second curved convex portion 2011b is RB, RA < RB, so as to achieve better curling and breaking of the chip when the cutting feed changes.

[0031] In some embodiments, such as Figure 2 and Figure 3 As shown, the first curved convex portion 2011a and the bottom face of the groove 5 are connected by a connecting concave portion 2011d, and the connecting concave portion 2011d has the effect of strengthening chip breaking.

[0032] In some embodiments, the radius of curvature of the transition concave surface 2011c is RC, where 0.2 mm ≤ RC ≤ 0.5 mm. This is because when the chip curls, if RC is too large, the contact area will increase, there will be insufficient clearance, the cutting heat generated will increase, and the tool life will be reduced. If RC is too small, it is easy to form sticking material during product pressing. Therefore, it is more appropriate to set the range of RC between 0.2 and 0.5 mm. Preferably, RC is 0.25 mm. The radius of curvature of the connecting concave surface 2011d is RD, where 0.2 mm ≤ RD ≤ 0.5 mm. This is because when the chip curls, if RD is too large, the contact area will increase, there will be insufficient clearance, the cutting heat generated will increase, and the tool life will be reduced. If RD is too small, it is easy to form sticking material during product pressing. Therefore, it is more appropriate to set the range of RD between 0.2 and 0.5 mm. Preferably, RD is 0.25 mm.

[0033] In some embodiments, such as Figure 2 and Figure 3 shown, in the height direction, the flank 7 is lower than the side chip breaker 201, which promotes the inflow of chips and their curling and breaking. At the same time, during the production process, when grinding the two end faces 3, it can prevent damage to the side cutting edge 101 and the corner cutting edge 102. Specifically, the height difference between the flank 7 and the side chip breaker 201 is H, where 0.1 ≤ H ≤ 0.3, and preferably H is 0.15. At the same time, the flank 7 is lower than the first curved surface protrusion 2011a so that chips can flow in for curling and breaking. The height difference between the flank 7 and the first curved surface protrusion 2011a is J, and the range is 0.05 ≤ J ≤ 0.15, and preferably J is 0.07. The bottom surface 5 of the groove type is lower than the flank 7, and there is a height difference K between the bottom surface 5 of the groove type and the flank 7. If K is too small, it is easy to form crater wear. If it is too large, the chip curling is not easy to break. The range of K is: 0.05 ≤ K ≤ 0.3, which is convenient for chip curling. Preferably, K is 0.2.

[0034] In some embodiments, such as Figure 3 shown, taking the intersection point of the first curved surface protrusion 2011a and the bottom surface 5 of the groove type in the horizontal direction as the tangent point, a first curved surface tangent line L1 tangent to the first curved surface protrusion 2011a is made. The angle between the first curved surface tangent line L1 and the horizontal direction is B; taking the intersection point of the first curved surface protrusion 2011a and the second curved surface protrusion 2011b as the tangent point, a second curved surface tangent line L2 tangent to the second curved surface protrusion 2011b is made. The angle between the second curved surface tangent line L2 and the horizontal direction is C. Among them, 30° ≤ B < C ≤ 50°. In this way, the chip curling can be better achieved. At the same time, the angle C between the second curved surface tangent line L2 and the horizontal direction is greater than the angle B between the first curved surface tangent line L1 and the horizontal direction, which is convenient for increasing the chip thickness and the chip curling radius during deep machining with large feed and large cut, and is convenient for the chip to curl and break.

[0035] In some embodiments, such as Figure 2 and Figure 4 As shown, in the direction of linear arrangement and gradually away from the corner chip reversing platform 202, the spacing between adjacent hyperboloid protrusions 2011 gradually increases, and the depth of the concave portion 2011e between adjacent hyperboloid protrusions 2011 gradually increases. In this way, a larger chip space can be provided when the cutting depth is large. The combined effect of the concave portion 2011e between adjacent hyperboloid protrusions 2011 and the transition concave portion 2011c between the first curved surface protrusion 2011a and the second curved surface protrusion 2011b further enhances the curling and breaking of chips when the feed rate is large and the cutting depth is large, and at the same time, the chips are further promoted to flow to the unprocessed surface of the workpiece, thereby improving the surface quality of the workpiece. Optionally, the spacing between adjacent hyperboloid protrusions 2011 is L, where 0.3≤L≤0.55.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An indexable cutting insert, characterized in that: include: A cutting edge, the cutting edge being formed at a boundary between an end face and a side face of the indexable cutting insert and comprising a side cutting edge and a corner cutting edge connected to an intersection of the side cutting edges; A chip counter, wherein the chip counter is formed on the end surface, and the chip counter is connected to the cutting edge via a groove bottom surface, a slope surface and an edge surface sequentially formed on the end surface; the chip counter comprises a side chip counter formed by a plurality of hyperbolic protrusions arranged linearly opposite to the side cutting edge, and a corner chip counter connected to the intersection of the side chip counter.

2. The indexable cutting insert according to claim 1, characterized in that: The side chip counter is sloped on the side facing the corresponding side cutting edge; the side chip counter has a first end and a second end in the direction of the linear arrangement, the first end is connected to the corner chip counter, the second end is away from the corner chip counter, and the distance between the second end and the corresponding side cutting edge is greater than the distance between the first end and the corresponding side cutting edge.

3. The indexable cutting insert according to claim 1, characterized in that: The heights of the plurality of hyperbolic protrusions in the linear arrangement direction are consistent.

4. The indexable cutting insert according to claim 1, characterized in that: Each of the hyperbolic convex portions includes a first curved convex portion and a second curved convex portion, the first curved convex portion is located lower than the second curved convex portion, and the first curved convex portion is connected to the second curved convex portion via a transition concave portion.

5. The indexable cutting insert according to claim 4, characterized in that: The curvature radius of the first curved surface convex portion is smaller than the curvature radius of the second curved surface convex portion.

6. The indexable cutting insert according to claim 4, characterized in that: The first curved surface convex portion is connected to the groove bottom surface via a connecting concave portion.

7. The indexable cutting insert according to claim 6, characterized in that The curvature radius of the transition concave portion is RC, 0.2 mm ≤ RC ≤ 0.5 mm; the curvature radius of the connection concave portion is RD, 0.2 mm ≤ RD ≤ 0.5 mm.

8. The indexable cutting insert according to claim 4, characterized in that: In the height direction, the edge surface is lower than the side chip countertop, and at the same time, the edge surface is lower than the first curved surface protrusion, and the groove bottom surface is lower than the edge surface.

9. The indexable cutting insert according to claim 4, characterized in that: Take the intersection point where the first curved surface protrusion intersects the horizontal direction of the groove bottom surface as the tangent point, and make a first curved surface tangent line tangent to the first curved surface protrusion, and the angle between the first curved surface tangent line and the horizontal direction is B; take the intersection point where the first curved surface protrusion intersects the second curved surface protrusion as the tangent point, and make a second curved surface tangent line tangent to the second curved surface protrusion, and the angle between the second curved surface tangent line and the horizontal direction is C, where 30°≤B <C≤50°。 10. The indexable cutting insert according to any one of claims 1 to 9, characterized in that: In the linear arrangement direction and in the direction gradually away from the corner chip reversing platform, the spacing between adjacent hyperbolic convex portions gradually increases, and the depth of the concave portions between adjacent hyperbolic convex portions gradually increases.

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