Negative turning blade

Abstract

The utility model provides a negative turning blade which comprises a cutting face, a plurality of cutting edges are arranged along the edge of the cutting face, the cutting face is provided with arc-shaped concave faces corresponding to the cutting edges, the cutting edges form an arc line along with the arc-shaped concave faces, chip breaking tables evenly distributed along the cutting edges are arranged on the cutting face, and the chip breaking tables are arranged on the cutting face. A chip rolling groove is formed in the position, corresponding to the intersection of the two cutting edges, of the cutting face, and the chip rolling groove is in arc transition connection with the arc-shaped concave face. The finish machining turning tool has the advantages that the arc-shaped concave face provided with the chip breaking table is matched with the cutting edge and the chip rolling groove to achieve sufficient chip breaking and rapid chip discharging, and the technical problems that an existing finish machining turning tool cannot well break chips and rapidly discharge iron chips after chip breaking are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal processing tool technical field especially relates to a negative turning blade. BACKGROUND

[0002] Turning is to cut off the redundant material from the rough (castings, forgings and profiles, etc.) by the cutter, so as to obtain the part that meets the drawing technical requirements.

[0003] And in the turning finish machining, the existing finish machining turning tool cannot cut the chips well when turning, and the long strip iron chips are formed, which are easy to wind on the workpiece and scratch the surface of the workpiece. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a negative turning blade, which solves the technical problems that the existing finish machining turning tool cannot cut the chips well and the iron chips are discharged quickly after cutting.

[0005] According to the negative turning blade of the embodiment of the utility model, the cutting surface is provided with a plurality of cutting edges along the edge, the cutting surface is provided with an arc concave surface corresponding to each cutting edge, the cutting edge follows the arc concave surface to form an arc line, the cutting surface is provided with a chip breaking platform uniformly distributed along the cutting edge, the cutting surface is provided with a chip winding groove corresponding to the intersection of two cutting edges, and the chip winding groove and the arc concave surface are connected through a circular arc.

[0006] The technical principle of the utility model is as follows: when cutting, the iron chips are generated at the cutting edge, then enter the chip winding groove, then transition to the arc concave surface, and then cut through a plurality of chip breaking platforms, and then discharged quickly at the lowest part of the arc concave surface.

[0007] The winding and cutting positions of the iron chips are most of the cases.

[0008] Compared with the prior art, the utility model has the advantages that: the arc concave surface with the chip breaking table realizes sufficient chip breaking and rapid chip removal by cooperating with the cutting edge and the chip rolling groove, and the utility model solves the technical problems that the existing finishing turning tool cannot break chips well and cannot remove the chips quickly after breaking.

[0009] Further, the chip breaking tables on both sides of the chip rolling groove are symmetrical to each other.

[0010] Further, the top of the chip breaking table is a convex circular arc surface, and the chip breaking table and the cutting surface are circularly transitioned.

[0011] Further, the cutting surface is uniformly distributed with chip rolling protrusions near the middle part in the circumferential direction, and each chip rolling protrusion corresponds to a chip rolling groove.

[0012] The chip rolling protrusions play a role in assisting chip rolling and breaking, and if the chips are not rolled in the chip rolling groove, the chips will contact the chip rolling protrusions to be rolled or broken.

[0013] Further, the top of the chip rolling protrusion is a convex circular arc surface, and the chip rolling protrusion and the cutting surface are circularly transitioned.

[0014] Further, the middle part of the cutting surface is provided with a screw hole, and the chip rolling protrusion is arranged near the screw hole.

[0015] Further, the negative turning insert further comprises a bottom surface, a side positioning surface is arranged between the bottom surface and the cutting surface, and the cutting edge is an intersection line of the side positioning surface and the cutting surface.

[0016] Further, a ring-shaped protrusion is arranged at the bottom surface, a lower positioning surface is arranged on the surface of the ring-shaped protrusion, and the lower positioning surface and the side positioning surface are perpendicular to each other.

[0017] The lower positioning surface and the side positioning surface ensure that the insert and the tool can be stably installed together, and ensure the stability during finishing.

[0018] Further, a side circular arc surface is arranged between adjacent side positioning surfaces, and the cutting edge corresponding to the side circular arc surface is also arranged in an arc shape.

[0019] Further, the cutting surface is a rhombus or an isosceles triangle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the negative turning insert of the utility model embodiment.

[0021] Figure 2 It is a top view of the negative turning insert of the utility model embodiment.

[0022] Figure 3 It is a structure schematic view of the chip rolling groove of the utility model embodiment.

[0023] Figure 4 This is a front view of the negative-shape turning insert according to an embodiment of the present invention.

[0024] Figure 5 This is a bottom view of the negative-shape turning insert according to an embodiment of the present invention.

[0025] In the above figures: 100, cutting surface; 110, cutting edge; 120, arc-shaped concave surface; 130, chip breaker; 131, convex arc surface; 140, chip groove; 150, screw hole; 160, chip protrusion; 200, bottom surface; 210, annular protrusion; 211, lower positioning surface; 300, side positioning surface; 310, side arc surface. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 The negative-shaped turning insert shown includes a cutting surface 100, which is a rhombus or an isosceles triangle. In this embodiment, a parallelogram-shaped cutting surface 100 is used as an example.

[0028] Specifically, the cutting surface 100 has four cutting edges 110 along its edge. Each cutting edge 110 has an arc-shaped concave surface 120. The cutting edge 110 follows the arc-shaped concave surface 120 in an arc shape for rapid chip removal. The cutting surface 120 has chip breaking platforms 130 evenly distributed along the cutting edge 110 for multiple chip breaking. At the intersection of two cutting edges 110, the cutting surface 100 has a chip folding groove 140 for chip folding. The chip folding groove 140 and the arc-shaped concave surface 120 are connected by an arc transition to guide the chips to the chip breaking platform 130.

[0029] like Figure 2 As shown, the chip breaking platforms 130 on both sides of the chip groove 140 are symmetrical to each other, so that no matter which cutting edge 110 is used as the main cutting edge 110, the number of chip breaking platforms 130 that the chips pass through is equal.

[0030] like Figure 3 As shown, the top of the chip breaker 130 is a convex arc surface 131, and the chip breaker 130 and the cutting surface 100 are connected by an arc, which ensures chip breaking while avoiding the accumulation of iron chips.

[0031] like Figure 1 As shown, a screw hole 150 is provided in the middle of the cutting surface 100 for fixing the insert to the tool. Chip-rolling protrusions 160 are evenly distributed around the cutting surface 100 near the screw hole 150. Each chip-rolling protrusion 160 corresponds to a chip-rolling groove 140. The top of the chip-rolling protrusion 160 is shaped as a convex arc surface 131. The chip-rolling protrusion 160 and the cutting surface 100 are connected by an arc to assist in chip rolling and chip breaking.

[0032] As Figure 1 , 4 The negative turning insert further comprises a bottom surface 200, and a side positioning surface 300 is arranged between the bottom surface 200 and the cutting surface 100, and the cutting edge 110 is an intersection line of the side positioning surface 300 and the cutting surface 100. Specifically, the bottom surface 200 is integrally formed with a ring-shaped protrusion 210, and a surface of the ring-shaped protrusion 210 is a lower positioning surface 211, which is perpendicular to the side positioning surface 300 and used for cooperating with the tool fixing to ensure the stability during cutting.

[0033] As Figure 1 The side positioning surfaces 300 are arranged with side circular arc surfaces 310 therebetween, and the cutting edges 110 corresponding to the side circular arc surfaces 310 are also arranged in an arc shape to form arc-shaped tool tips. In the embodiment, the cutting surface 100 is in a rhombic shape, and thus there are four arc-shaped tool tips, and the four tool tips can be used for cutting.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A negative turning insert, characterized by: The cutting face is provided with a plurality of cutting edges along the edge, and the cutting face is provided with an arc-shaped recess surface corresponding to each cutting edge, the cutting edge follows the arc-shaped recess surface as an arc line, the cutting face is provided with a chip breaking platform uniformly distributed along the cutting edge, and the cutting face is provided with a chip winding groove corresponding to the intersection of two cutting edges.

2. A negative turning insert according to claim 1, characterised in that: The chip breaking platforms on both sides of the chip winding groove are symmetrical to each other.

3. A negative turning insert according to claim 1 or 2, characterised in that: The top of the chip breaking platform is a convex arc surface, and the chip breaking platform and the cutting face are arc transitionally connected.

4. A negative turning insert according to claim 1, characterized in that: The cutting face is provided with a chip winding convex near the middle position and uniformly distributed in the circumferential direction, and each chip winding convex corresponds to a chip winding groove.

5. A negative turning insert according to claim 4, characterised in that: The top of the chip winding convex is a convex arc surface, and the chip winding convex and the cutting face are arc transitionally connected.

6. A negative turning insert according to claim 4 or 5, characterised in that: The middle of the cutting face is provided with a screw hole, and the chip winding convex is arranged near the screw hole.

7. A negative turning insert according to claim 1, characterized in that: The negative turning insert further comprises a bottom surface, a side positioning surface is arranged between the bottom surface and the cutting face, and the cutting edge is an intersection line of the side positioning surface and the cutting face.

8. A negative turning insert according to claim 7, characterised in that: An annular convex is arranged on the bottom surface, a lower positioning surface is arranged on the surface of the annular convex, and the lower positioning surface and the side positioning surface are perpendicular to each other.

9. A negative turning insert according to claim 7, characterized in that: A side arc surface is arranged between adjacent side positioning surfaces, and the corresponding cutting edge is also arc-shaped.

10. A negative turning insert according to claim 1, characterized in that: The cutting face is a rhombus or an isosceles triangle.

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