Indexable cutting insert

Abstract

The present invention discloses an indexable cutting blade, comprising a blade body; the outline projection of the blade body is roughly rectangular; the blade body has an upper surface and a lower surface parallel to each other, and a side surface connecting the upper and lower surfaces and perpendicular thereto; the upper surface intersects with the side surface to form a cutting edge portion; the cutting edge portion comprises two long cutting edges parallel to each other, two short cutting edges parallel to each other, and a rounded cutting edge connecting the long cutting edges and the short cutting edges adjacent to each other; a water drop-shaped protrusion of suitable size and number is arranged on the inner side of the cutting edge portion, and the long cutting edge is arranged with a descending dimension relative to the rounded cutting edge. The present invention can utilize the cooperation of the water drop-shaped protrusion and the cutting edge portion to cope with different cutting thicknesses, so that the chips can be stably curled and broken and discharged smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of cutting tools, and in particular to an indexable cutting blade for cutting and processing metal parts, such as for repairing and processing railway wheels. Background Art

[0002] Train wheels are important parts for trucks, passenger cars, subways and EMUs, and different types of wheels are made of different materials. Trains are running every day, and the outer side, contact surface and wheel flange of the train wheel rim rub against the rails. Affected by factors such as the weight of the train and the running speed, the thickness of the wear material to be removed on the outer side, contact surface and wheel flange of the train wheel rim is uneven. For the cutting blade, the change in cutting depth places higher requirements on the chip flow direction and cutting control. What is even more difficult to process is the transition from the wheel contact surface to the wheel rim, and it is more difficult to control the chips in this area.

[0003] Most of the cutting blades in the prior art adopt a through-slot design to reduce cutting force and increase tool life, but pay less attention to cutting control caused by changes in cutting depth and overall structural strength. However, it is well known that good chip removal can take away most of the heat generated by cutting and reduce the impact of cutting heat on the tool. The chips generated by train wheel repair are thicker. If irregular chip entanglement occurs, it will not only affect the life of the tool and the surface quality of the workpiece, but also reduce processing efficiency. In severe cases, it will also damage the machine and affect personal safety. Summary of the invention

[0004] The object of the present invention is to overcome the shortcomings of the prior art and provide an indexable cutting insert, by arranging teardrop-shaped protrusions of appropriate size and number on the surface of the cutting insert, and setting a descending size on the longer cutting edge to cope with different cutting thicknesses, so that the chips can be stably curled and broken and discharged smoothly, thereby improving the service life of the tool and the surface quality of the workpiece.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an indexable cutting blade, including a blade body; the outline projection of the blade body is roughly rectangular; the blade body has an upper surface and a lower surface parallel to each other, and a side surface connecting the upper and lower surfaces and perpendicular to them; the upper surface intersects with the side surface to form a cutting edge portion; the cutting edge portion includes two long cutting edges parallel to each other, two short cutting edges parallel to each other, and a rounded cutting edge that connects the long cutting edges and short cutting edges adjacent to each other respectively; a teardrop-shaped protrusion of appropriate size and number is arranged on the inner side of the cutting edge portion, and at the same time, the long cutting edge is set with a descending size relative to the rounded cutting edge, so as to utilize the cooperation of the teardrop-shaped protrusion and the cutting edge portion to cope with different cutting thicknesses, so that the chips can be stably curled and broken and discharged smoothly.

[0006] The appropriate number of water drop-shaped protrusions is 1 to 10 water drop-shaped protrusions distributed at the four corners of the rectangular blade body.

[0007] At the corner position of the blade body, a front cutting surface with a certain inclination angle is extended inwardly from the cutting edge portion, and the front cutting surface is gradually lowered from the outside to the inside; a groove bottom surface with a certain width is extended inwardly from the front cutting surface, and the height position of the groove bottom surface is lower than the height position of the rounded cutting edge; the groove bottom surface and the upper surface are connected to form an anti-chip surface; a teardrop-shaped protrusion is arranged on at least two surfaces of the front cutting surface, the groove bottom surface and the anti-chip surface.

[0008] The teardrop-shaped protrusion is narrow outside and wide inside, and the highest point of the teardrop-shaped protrusion is lower than the position of the rounded cutting edge.

[0009] In each of the water drop-shaped protrusions at the corner position of the blade body, the interval between two adjacent water drop-shaped protrusions is 0.5-5 mm.

[0010] The blade body is also provided with a through hole penetrating the side surfaces corresponding to the two long cutting edges, and the through hole is arranged at the middle position of the side surfaces corresponding to the long cutting edges.

[0011] The teardrop-shaped protrusions at the corners of the blade body include at least a first teardrop-shaped protrusion corresponding to the intersection of the short cutting edge and the rounded cutting edge, a second teardrop-shaped protrusion corresponding to the rounded cutting edge, and a third teardrop-shaped protrusion corresponding to the long cutting edge.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The present invention adopts a method of setting a water drop-shaped protrusion of appropriate size and number on the inner side of the cutting edge, and setting a lower dimension of the long cutting edge relative to the rounded cutting edge. The present invention utilizes the cooperation of the water drop-shaped protrusion and the cutting edge to cope with different cutting thicknesses, so that the chips are stably curled and broken and discharged smoothly.

[0014] 2. The present invention adopts a method that a front cutting face with a certain inclination angle is extended from the cutting edge portion to the inside at the corner of the blade body, and the front cutting face is gradually reduced from the outside to the inside; a groove bottom surface with a certain width is extended from the front cutting face to the inside, and the height position of the groove bottom surface is lower than the height position of the rounded cutting edge; the groove bottom surface and the upper surface are connected to form an anti-chip surface; and the water drop-shaped protrusion is set in at least two surfaces of the front cutting face, the groove bottom surface and the anti-chip surface. With this structure of the present invention, the chips generated by cutting are stably curled by the several water drop-shaped protrusions at the corner of the blade body, and the curled chips are cut off and discharged smoothly, which can play an excellent chip removal effect under a wide range of cutting conditions; at the same time, when the chips generated by cutting flow to the several water drop-shaped protrusions at the corner of the blade body, the chips generated by cutting are in point contact with the water drop-shaped protrusions, reducing the contact area between the chips and the chip breaker groove, effectively reducing the cutting temperature and cutting resistance, and improving the tool life.

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the indexable cutting insert of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the use state of the present invention (for repairing train wheels);

[0017] Figure 2 is a top view of an embodiment of the present invention;

[0018] Figure 3 is a front view of an embodiment of the present invention;

[0019] Figure 4 It is a partially enlarged schematic diagram of an embodiment of the present invention.

[0020] In the figure, 10, blade body; 11, side surface of blade body; 12, upper surface of blade body; 13, lower surface of blade body; 14, long cutting edge; 15, short cutting edge; 16, rounded cutting edge; 17, through hole of blade body; 18, first teardrop-shaped protrusion; 19, second teardrop-shaped protrusion; 20, second teardrop-shaped protrusion; 21, third teardrop-shaped protrusion; 22, front cutting edge; 23, groove bottom surface; 24, anti-chip surface; 25, train wheel rim; 26, outer side of train wheel rim; 27, contact surface of train wheel rim; 28, flange of train wheel rim. DETAILED DESCRIPTION

[0021] Example

[0022] See also Figures 1 to 4As shown, an indexable cutting insert of the present invention is mainly used to remove materials by wearing the outer side 26, contact surface 27 and wheel flange 28 of a railway wheel rim 25 to different degrees, and its varying cutting depth requires the blade to place higher requirements on chip control; the cutting insert comprises a blade body 10; the outline projection of the blade body 10 is roughly rectangular; the blade body 10 has an upper surface 12 and a lower surface 13 parallel to each other, and a side surface 11 connecting the upper surface 12 and the lower surface 13 and perpendicular thereto; the upper surface 12 intersects with the side surface 11 to form a cutting edge portion; the cutting edge portion comprises two long cutting edges 14 parallel to each other, two short cutting edges 15 parallel to each other, and a rounded cutting edge 16 connecting the long cutting edges and the short cutting edges adjacent to each other, as shown in FIG. Figure 2 As shown, there are four rounded cutting edges 16; teardrop-shaped protrusions of appropriate size and number are provided on the inner side of the cutting edge portion, and at the same time, the long cutting edge 14 is set to a lower dimension relative to the rounded cutting edge 16 (that is, the height position of the long cutting edge 14 is lower than the height position of the rounded cutting edge 16 by a preset dimension), so as to utilize the cooperation between the teardrop-shaped protrusion and the cutting edge portion to cope with different cutting thicknesses, so that the chips can be stably curled and broken and discharged smoothly.

[0023] The appropriate number of water drop-shaped protrusions is 1 to 10 water drop-shaped protrusions distributed at the four corners of the rectangular blade body. In this embodiment, there are four water drop-shaped protrusions at the corners of the blade body.

[0024] In this embodiment, at the corner of the blade body, a rake face 22 with a certain inclination angle is extended inward from the cutting edge portion, and the rake face 22 is gradually lowered from the outside to the inside; a groove bottom face 23 with a certain width is extended inward from the rake face, and the height position of the groove bottom face 23 is lower than the height position of the rounded cutting edge 16; the groove bottom face 23 and the upper surface 12 are connected to form an anti-chip surface 24; the water drop-shaped protrusion is provided on at least two surfaces of the rake face 22, the groove bottom face 23 and the anti-chip surface 24. This structure of the present invention can achieve better chip control.

[0025] like Figure 3 As shown, the long cutting edge 14 is set with a reduced dimension relative to the rounded cutting edge 16. By setting the reduced dimension, the chips can be effectively controlled and the cutting resistance can be reduced, thereby increasing the tool life.

[0026] In this embodiment, the teardrop-shaped protrusion is narrow outside and wide inside, and the highest point of the teardrop-shaped protrusion is lower than the position of the rounded cutting edge 16 .

[0027] In this embodiment, in each of the water drop-shaped protrusions at the corner position of the blade body, the interval between two adjacent water drop-shaped protrusions is 0.5-5 mm.

[0028] In this embodiment, the blade body 10 is further provided with a through hole 17 penetrating the sides corresponding to the two long cutting edges, and the through hole 17 is arranged in the middle of the side 11 corresponding to the long cutting edge 14. The through hole 17 is used to accommodate a locking mechanism so that the blade body 10 is fixed to the tool holder.

[0029] In this embodiment, the four teardrop-shaped protrusions at the corner positions of the blade body 10 include a first teardrop-shaped protrusion 18 corresponding to the intersection of the short cutting edge 15 and the rounded cutting edge 16, two second teardrop-shaped protrusions 19 corresponding to the positions of the rounded cutting edges 16, and a third teardrop-shaped protrusion 21 corresponding to the positions of the long cutting edges 14.

[0030] like Figure 4 As shown, in an indexable cutting insert of the present invention, when the cutting depth is small, the chips generated by the rounded cutting edge 16 are stably curled by the first teardrop-shaped protrusion 18. In addition, under the cutting conditions of small cutting depth and large feed (high feed), the chips generated by the rounded cutting edge 16 pass over the first teardrop-shaped protrusion 18 and are stably curled by the anti-chip surface 24, and the curled chips are cut off and discharged smoothly. When the cutting depth is small, the chips generated by the rounded cutting edge 16 are stably curled by the second teardrop-shaped protrusion 19. In addition, under the cutting conditions of small cutting depth and large feed (high feed), the chips generated by the rounded cutting edge 16 pass over the second teardrop-shaped protrusion 19 and are stably curled by the anti-chip surface 24, and the curled chips are cut off and discharged smoothly. At medium cutting depth, the chips generated by the rounded cutting edge 16 are stably curled by the second teardrop-shaped protrusion 20. In addition, under the cutting conditions of medium cutting depth and large feed (high feed), the chips generated by the rounded cutting edge 16 pass over the second teardrop-shaped protrusion 20 and are stably curled by the anti-chip surface 24, and the curled chips are cut off and discharged smoothly. At large cutting depth, the chips generated by the long cutting edge 14 and the rounded cutting edge 16 are stably curled by the first teardrop-shaped protrusion 18, the second teardrop-shaped protrusions 19, 20, and the third teardrop-shaped protrusion 21. In addition, under the cutting conditions of large cutting depth and large feed (high feed), the chips generated by the long cutting edge 14 and the rounded cutting edge 16 pass over the first teardrop-shaped protrusion 18, the second teardrop-shaped protrusions 19, 20, and the third teardrop-shaped protrusion 21 and are stably curled by the anti-chip surface 24, and the curled chips are cut off and discharged smoothly.

[0031] The present invention is an indexable cutting insert, which is provided with teardrop-shaped protrusions of appropriate size and number, namely, first teardrop-shaped protrusions 18, second teardrop-shaped protrusions 19, 20, and third teardrop-shaped protrusions 21, on the inner side of the cutting edge portion, and the long cutting edge 14 is provided with a lowered dimension relative to the rounded cutting edge 16. The present invention utilizes the cooperation between the teardrop-shaped protrusions and the cutting edge portion to cope with different cutting thicknesses, so that the chips are stably curled and broken and discharged smoothly.

[0032] The present invention provides an indexable cutting insert, which has a front cutting face 22 with a certain inclination angle extending inwardly from the cutting edge portion at a corner position of a blade body 10, and the front cutting face 22 gradually decreases from the outside to the inside; a groove bottom surface 23 with a certain width extending inwardly from the front cutting face 22, and the height position of the groove bottom surface 23 is lower than the height position of the rounded cutting edge 16; an anti-chip surface 24 is formed by connecting the groove bottom surface 23 and the upper surface 12; four teardrop-shaped protrusions, namely a first teardrop-shaped protrusion 18, a second teardrop-shaped protrusion 19, 20, and a third teardrop-shaped protrusion 21, are arranged in at least two surfaces of the front cutting face, the groove bottom surface and the anti-chip surface. According to the structure of the present invention, the chips generated by cutting are stably curled by the several teardrop-shaped protrusions at the corners of the blade body, and the curled chips are cut off and discharged smoothly, which can exert excellent chip removal effect under a wide range of cutting conditions; at the same time, when the chips generated by cutting flow to the several teardrop-shaped protrusions at the corners of the blade body, the chips generated by cutting are in point contact with the teardrop-shaped protrusions, reducing the contact area between the chips and the chip breaker groove, effectively reducing the cutting temperature and cutting resistance, and improving the tool life.

[0033] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An indexable cutting insert, comprising a blade body; the outline projection of the blade body is substantially rectangular; the blade body has an upper surface and a lower surface parallel to each other, and a side surface connecting the upper surface and the lower surface and being perpendicular thereto; the upper surface intersects with the side surface to form a cutting edge portion; the cutting edge portion comprises two long cutting edges parallel to each other, two short cutting edges parallel to each other, and a rounded cutting edge connecting the long cutting edges and the short cutting edges adjacent to each other; characterized in that: The inner side of the cutting edge is provided with a teardrop-shaped protrusion of appropriate size and number, and the long cutting edge is provided with a descending dimension relative to the rounded cutting edge, so as to utilize the cooperation between the teardrop-shaped protrusion and the cutting edge to cope with different cutting thicknesses, so that the chips can be stably curled and broken and discharged smoothly; At the corner position of the blade body, a front cutting face with a certain inclination angle is extended inwardly from the cutting edge portion, and the front cutting face is gradually lowered from the outside to the inside; a groove bottom surface with a certain width is extended inwardly from the front cutting face, and the height position of the groove bottom surface is lower than the height position of the rounded cutting edge; the groove bottom surface and the upper surface are connected to form an anti-chip surface; the water drop-shaped protrusion is arranged on at least two surfaces of the front cutting face, the groove bottom surface and the anti-chip surface; The teardrop-shaped protrusion is narrow outside and wide inside, and the highest point of the teardrop-shaped protrusion is lower than the position of the rounded cutting edge; The teardrop-shaped protrusions at the corners of the blade body include at least a first teardrop-shaped protrusion corresponding to the intersection of the short cutting edge and the rounded cutting edge, a second teardrop-shaped protrusion corresponding to the rounded cutting edge, and a third teardrop-shaped protrusion corresponding to the long cutting edge.

2. The indexable cutting insert according to claim 1, characterized in that: The appropriate number of water drop-shaped protrusions is 1 to 10 water drop-shaped protrusions distributed at the four corners of the rectangular blade body.

3. The indexable cutting insert according to claim 1, characterized in that: In each of the water drop-shaped protrusions at the corner position of the blade body, the interval between two adjacent water drop-shaped protrusions is 0.5-5 mm.

4. The indexable cutting insert according to claim 1, characterized in that: The blade body is also provided with a through hole penetrating the side surfaces corresponding to the two long cutting edges, and the through hole is arranged at the middle position of the side surfaces corresponding to the long cutting edges.

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