A u drill insert and tool having a wavy chip flute

Abstract

The utility model provides a kind of U drill blade and tool with wavy chip flute, the side of the blade and the top surface junction is side cutting edge, two two side cutting edge arc transition is arc cutting edge, and the direction of arc cutting edge and side cutting edge to blade mounting hole is in turn blade land, rake face and mounting plane;Multiple mutually connected protrusions are in the rake face corresponding to the side cutting edge;The arrangement direction of the protrusion is parallel with side cutting edge, and the protrusion length direction extends from blade land to blade positioning hole direction.The utility model sets up blade land between cutting edge and chip flute, so that the improvement of chip flute groove structure will not affect cutting edge, to avoid cutting edge stress concentration;The chip flute is set to multiple mutually connected protrusions, and the arrangement direction of the protrusion is parallel with side cutting edge, and the length direction of the protrusion extends from blade land to blade positioning hole direction, and the chip flute of this structure is more impact-resistant relative to prior art, with good chip breaking and chip removal function.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and more specifically, to a U-drill insert and tool with a wavy chip removal groove. Background Technology

[0002] U-shaped drill inserts are inserts used in indexable drill bits, widely applied in the machining of shallow and large-diameter holes. To promote chip removal, those skilled in the art typically incorporate chip grooves into the inserts. For example, utility model patent application number 202322381101.5, entitled "A Cutting Insert for Hole Machining," utilizes a corrugated upper surface and a non-flat top surface to achieve double deformation and curling of chips flowing over the insert's upper surface. This effectively improves the insert's ability to deform and break chips, enhances chip removal, reduces poor chip breaking ability, prevents chip clogging, and avoids tool wear or breakage, as well as reduced workpiece surface quality and precision. While this patent uses a corrugated upper surface and its cutting edge is also corrugated, essentially creating a multi-folded plane, which, although beneficial for chip breaking and removal, makes the cutting edge prone to stress concentration. For example, patent application number 201911234092.9, entitled "An Invention Patent for a Cutting Insert for Hole Machining," describes an invention whose upper surface includes a center surface located in the central region and a grooved surface located around the center surface. The grooved surface includes a groove front, a groove back, and a groove bottom surface located between the groove front and groove back. The groove front is adjacent to the main cutting edge and the corner cutting edge, while the groove back is adjacent to the center surface. The main cutting edge includes a straight cutting edge and a wavy cutting edge. The groove back and center surface corresponding to the same main cutting edge intersect to form a wavy critical line. In the direction of the upper surface, the amplitude of the wavy critical line waveform is greater than the amplitude of the wavy cutting edge waveform, which has advantages such as smooth chip removal, good surface finish, low cutting vibration, and long service life. However, the cutting edge of this patent is also wavy, which also suffers from stress concentration, resulting in a weaker cutting edge strength. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies that use corrugated chip removal grooves to enhance chip breaking and removal functions, resulting in stress concentration on the cutting edge due to the corrugated shape of the cutting edge. It provides a U-drill insert and tool with corrugated chip removal grooves that offers good chip breaking and removal performance without affecting the strength of the cutting edge.

[0004] A U-shaped drill insert with a wave-shaped chip removal groove includes a top surface, a bottom surface, and a side surface between the top and bottom surfaces. The side surface is connected to the top surface as a side cutting edge, and the arc transition between any two side cutting edges is an arc cutting edge. A insert positioning hole is provided at the geometric center of the insert. The arc cutting edge and the side cutting edge are, in order, a cutting edge band, a rake face, and a mounting plane in the direction towards the insert mounting hole. The rake face corresponding to the side cutting edge has multiple interconnected protrusions, thereby forming a wave-shaped chip removal groove. The arrangement direction of the protrusions is parallel to the side cutting edge, and the length direction of the protrusions extends from the cutting edge band towards the insert positioning hole.

[0005] In this invention, the side cutting edge and the circular arc cutting edge are collectively referred to as the cutting edge.

[0006] Furthermore, the wavy chip removal groove connects with the cutting edge, so that the connection between the cutting edge and the chip removal groove is also wavy.

[0007] Furthermore, the edge of the cutting edge corresponding to the arc-shaped cutting edge is arc-shaped, and the edge of the cutting edge corresponding to the side cutting edge is wavy, with the wavy edge extending to connect with the arc-shaped edge. That is, the chip removal grooves are arranged to connect with the arc-shaped cutting edge.

[0008] The edge of the cutting edge refers to the side of the cutting edge away from the cutting edge.

[0009] Furthermore, the crests of the chip removal groove are on the same horizontal plane as the cutting edge.

[0010] Furthermore, the intersection of the two protrusions of the chip removal groove is a curve. The curve starts from the cutting edge and slopes inward toward the inside of the blade, then gradually extends outward to connect with the mounting plane.

[0011] Furthermore, the curve is composed of three lines connected in sequence, with an arc transition connecting adjacent lines.

[0012] Furthermore, the three lines are each a curve.

[0013] Furthermore, of the three lines, the line connected to the cutting edge is a straight line, while the other two lines are curves. The three curved lines provide better chip removal than a straight line plus two curved lines, but the straight line is more convenient to machine.

[0014] Furthermore, the top and bottom surfaces are square end faces.

[0015] This utility model also provides a cutting tool, including a tool holder and a cutting blade mounted on the tool holder, wherein the cutting blade is a U-shaped drill cutting blade with a wavy chip removal groove as described above.

[0016] This utility model has the following beneficial effects:

[0017] This utility model discloses a U-drill insert and tool with a wavy chip removal groove. The improved shape and position of the chip removal groove enable the insert to have both excellent chip breaking and removal capabilities and to avoid stress concentration on the cutting edge. Specifically, a cutting edge band is provided between the cutting edge and the chip removal groove, ensuring that the improved groove structure does not affect the side cutting edge and avoids stress concentration on the cutting edge. The chip removal groove is composed of multiple interconnected protrusions, with the protrusions arranged parallel to the side cutting edge. The length of the protrusions extends from the cutting edge band towards the insert positioning hole. This chip removal groove structure is more impact-resistant than existing technologies and has excellent chip breaking and removal capabilities. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of a U-shaped drill bit with a wave-shaped chip removal groove;

[0020] Figure 2 This is an enlarged view of the curve at the intersection of two adjacent protrusions in Example 1;

[0021] Figure 3 This is an enlarged view of the curve at the intersection of two adjacent protrusions in Example 2.

[0022] The serial numbers are: 1-top surface, 2-bottom surface, 3-side surface, 4-side cutting edge, 5-circular arc cutting edge, 6-insert positioning hole, 7-cutting edge, 8-protrusion, 9-edge of the cutting edge corresponding to the circular arc cutting edge, 10-edge of the cutting edge corresponding to the side cutting edge, 11-curve one, 12-curve two, 13-curve three, 14-straight line segment, 15-mounting plane. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0027] Example 1

[0028] A U-drill insert with a wavy chip removal groove, which is a square U-drill insert, such as... Figure 1As shown, the blade includes a top surface 1, a bottom surface 2, and a side surface 3 between the top surface 1 and the bottom surface 2. The area of ​​the bottom surface 2 is smaller than the area of ​​the top surface 1, so the blade has a hexahedral structure that is wider at the top and narrower at the bottom. The side surface 3 is connected to the top surface 1 to form a side cutting edge 4. The arc transition between any two side cutting edges 4 forms an arc cutting edge 5. A blade positioning hole 6 is provided at the geometric center of the blade. The arc cutting edge 5 and the side cutting edge 4 are, in order, a cutting edge 7, a rake face, and a mounting plane 15 towards the blade mounting hole. The rake face corresponding to the side cutting edge 4 has multiple interconnected protrusions 8, thereby forming a wave-shaped chip removal groove. The arrangement direction of the protrusions 8 is parallel to the side cutting edge 4, and the length direction of the protrusions 8 extends from the cutting edge 7 towards the blade positioning hole 6.

[0029] like Figure 1 As shown, the wavy chip groove connects with the cutting edge 7, making the junction of the cutting edge 7 and the chip groove also wavy. The chips flow across the rake face, and the protrusion 8 curls and breaks them. The improved chip groove shape in this embodiment does not affect the structure of the cutting edge. In this embodiment, the side cutting edge 4 is straight, and the arc cutting edge 5 is arc-shaped, resulting in no stress concentration on the cutting edge. In this application, the protrusion 8 protrudes upwards from the top surface 1, and the crest of the chip groove is on the same horizontal plane as the cutting edge 7. This chip groove structure is more impact-resistant than existing technologies and has excellent chip breaking and removal functions.

[0030] like Figure 1 As shown, the edge 9 of the cutting edge corresponding to the arc cutting edge is arc-shaped, and the edge 10 of the cutting edge corresponding to the side cutting edge is wavy, with the wavy edge extending to connect with the arc-shaped edge.

[0031] like Figure 2 As shown, the intersection of the two protrusions 8 of the chip removal groove is a curve. This curve begins at the cutting edge 7 and slopes inwards towards the inside of the blade, then gradually extends outwards to connect with the mounting plane 15. Specifically, the curve is composed of three sequentially connected curve segments, with adjacent lines connected by a rounded transition, such as... Figure 2 As shown, curve 11, curve 212, and curve 313 are shown.

[0032] This embodiment describes a U-drill insert with a wavy chip removal groove. The improved shape and position of the chip removal groove allow the insert to not only have excellent chip breaking and removal capabilities but also avoid stress concentration on the cutting edge. Specifically, a cutting edge band 7 is provided between the cutting edge and the chip removal groove, ensuring that the improved groove structure does not affect the cutting edge and avoids stress concentration. The chip removal groove consists of multiple interconnected protrusions 8, with the protrusions 8 arranged parallel to the side cutting edge 4. The length of the protrusions 8 extends from the cutting edge band 7 towards the insert positioning hole 6. This chip removal groove structure is more impact-resistant than existing technologies and has excellent chip breaking and removal capabilities.

[0033] Example 2

[0034] A U-drill insert with a wavy chip removal groove, which is a square U-drill insert, such as... Figure 1 As shown, the blade includes a top surface 1, a bottom surface 2, and a side surface 3 between the top surface 1 and the bottom surface 2. The area of ​​the bottom surface 2 is smaller than the area of ​​the top surface 1, so the blade has a hexahedral structure that is wider at the top and narrower at the bottom. The side surface 3 is connected to the top surface 1 to form a side cutting edge 4. The arc transition between any two side cutting edges 4 forms an arc cutting edge 5. A blade positioning hole 6 is provided at the geometric center of the blade. The arc cutting edge 5 and the side cutting edge 4 are, in order, a cutting edge 7, a rake face, and a mounting plane 15 towards the blade mounting hole. The rake face corresponding to the side cutting edge 4 has multiple interconnected protrusions 8, thereby forming a wave-shaped chip removal groove. The arrangement direction of the protrusions 8 is parallel to the side cutting edge 4, and the length direction of the protrusions 8 extends from the cutting edge 7 towards the blade positioning hole 6.

[0035] like Figure 1 As shown, the wavy chip removal groove is connected to the cutting edge 7, so that the connection between the cutting edge 7 and the chip removal groove is also wavy.

[0036] like Figure 1 As shown, the edge 9 of the cutting edge corresponding to the arc cutting edge is arc-shaped, and the edge 10 of the cutting edge corresponding to the side cutting edge is wavy, with the wavy edge extending to connect with the arc-shaped edge.

[0037] In this application, the protrusion 8 protrudes upward from the top surface 1, and the crest of the chip removal groove is on the same horizontal plane as the cutting edge 7.

[0038] like Figure 3 As shown, the intersection of the two protrusions 8 of the chip removal groove is a curve. The curve starts from the cutting edge 7 and slopes inward towards the inside of the blade, then gradually extends outward to connect with the mounting plane 15. Specifically, the line connected to the cutting edge 7 among the three lines is a straight line, while the other two lines are curves, with adjacent lines connected by an arc transition.

[0039] The difference between Example 2 and Example 1 is that the line connected to the blade 7 in the three-segment line is a straight line, while the other two lines are curves, such as... Figure 3 The diagram shows straight line segment 14, curve 2 12, and curve 3 13. The first line of Example 2 is a straight line, while the first line of Example 1 is a curve. Compared with Example 1, the blade of Example 1 has better chip removal function, but the structure of Example 2 is more convenient to process.

[0040] Example 3

[0041] A cutting tool includes a tool holder and a cutting blade mounted on the tool holder, wherein the cutting blade is a U-shaped drill cutting blade with a wavy chip removal groove as described in Example 1.

[0042] Specifically, it is a U-drill insert with a wavy chip removal groove, which is a square U-drill insert, such as... Figure 1 As shown, the blade includes a top surface 1, a bottom surface 2, and a side surface 3 between the top surface 1 and the bottom surface 2. The area of ​​the bottom surface 2 is smaller than the area of ​​the top surface 1, so the blade has a hexahedral structure that is wider at the top and narrower at the bottom. The side surface 3 is connected to the top surface 1 to form a side cutting edge 4. The arc transition between any two side cutting edges 4 forms an arc cutting edge 5. A blade positioning hole 6 is provided at the geometric center of the blade. The arc cutting edge 5 and the side cutting edge 4 are, in order, a cutting edge 7, a rake face, and a mounting plane 15 towards the blade mounting hole. The rake face corresponding to the side cutting edge 4 has multiple interconnected protrusions 8, thereby forming a wave-shaped chip removal groove. The arrangement direction of the protrusions 8 is parallel to the side cutting edge 4, and the length direction of the protrusions 8 extends from the cutting edge 7 towards the blade positioning hole 6.

[0043] like Figure 1 As shown, the wavy chip groove connects with the cutting edge 7, making the junction of the cutting edge 7 and the chip groove also wavy. The chips flow across the rake face, and the protrusion 8 curls and breaks them. The improved chip groove shape in this embodiment does not affect the structure of the cutting edge. In this embodiment, the side cutting edge 4 is straight, and the arc cutting edge 5 is arc-shaped, resulting in no stress concentration on the cutting edge. In this application, the protrusion 8 protrudes upwards from the top surface 1, and the crest of the chip groove is on the same horizontal plane as the cutting edge 7. This chip groove structure is more impact-resistant than existing technologies and has excellent chip breaking and removal functions.

[0044] like Figure 1 As shown, the edge 9 of the cutting edge corresponding to the arc cutting edge is arc-shaped, and the edge 10 of the cutting edge corresponding to the side cutting edge is wavy, with the wavy edge extending to connect with the arc-shaped edge.

[0045] like Figure 2 As shown, the intersection of the two protrusions 8 of the chip removal groove is a curve. This curve begins at the cutting edge 7 and slopes inwards towards the inside of the blade, then gradually extends outwards to connect with the mounting plane 15. Specifically, the curve is composed of three sequentially connected curve segments, with adjacent lines connected by a rounded transition, such as... Figure 2 As shown, curve 11, curve 212, and curve 313 are shown.

[0046] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the present utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of the present utility model.

Claims

1. A U-shaped drill bit with a wavy chip removal groove, comprising a top surface, a bottom surface, and a side surface between the top and bottom surfaces, wherein the junction of the side surface and the top surface is a side cutting edge, and the arc transition between any two side cutting edges is an arc cutting edge, and a bit positioning hole is provided at the geometric center of the bit; characterized in that, The circular arc cutting edge and the side cutting edge are, in order, the cutting edge, the rake face, and the mounting plane in the direction of the insert mounting hole; the rake face corresponding to the side cutting edge has multiple interconnected protrusions, thereby forming a wave-shaped chip removal groove; the arrangement direction of the protrusions is parallel to the side cutting edge, and the length direction of the protrusions extends from the cutting edge to the insert positioning hole.

2. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The wavy chip removal groove connects to the cutting edge, so that the connection between the cutting edge and the chip removal groove is also wavy.

3. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The edge of the cutting edge corresponding to the arc cutting edge is arc-shaped, and the edge of the cutting edge corresponding to the side cutting edge is wavy, with the wavy edge extending to connect with the arc-shaped edge.

4. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The crests of the chip removal groove are on the same horizontal plane as the cutting edge.

5. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The intersection of the two protrusions of the chip removal groove is a curve. The curve starts from the cutting edge and slopes inward toward the inside of the blade, and then gradually extends outward to connect with the mounting plane.

6. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The curve is composed of three lines connected in sequence, with adjacent lines connected by a circular arc transition.

7. A U-shaped drill bit with a wavy chip removal groove according to claim 6, characterized in that, The three lines are three curves.

8. A U-shaped drill bit with a wavy chip removal groove according to claim 6, characterized in that, Of the three lines, the line connected to the blade is a straight line, while the other two lines are curves.

9. A U-shaped drill bit with a wavy chip removal groove according to claim 1, characterized in that, The top and bottom surfaces are square end faces.

10. A cutting tool, comprising a tool holder and a cutting blade mounted on the tool holder, characterized in that, The cutting tool is a U-shaped drill cutting tool with a wavy chip removal groove as described in any one of claims 1-9.

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