A cutting tool

Abstract

The utility model relates to the technical field of machining, disclose a kind of tool, when tool body high-speed rotation thereby drive tool bit to carry out cutting to workpiece, chip will obtain higher linear velocity with the rotation of tool body, when chip enters chip breaking groove, the inner wall of chip breaking groove can cause physical obstruction to chip, chip and the inner wall of chip breaking groove collide, its end will be forced to lift or bend by chip breaking surface, exceed the bending strength of material and then break, form short, regular chip breaking, and then chip breaking is thrown under the rotation effect.Simultaneously, the front end of the chip breaking groove of the present application protrudes from the front end of the tool bit, which can ensure that the chips enter the chip breaking groove and will not be wound on the tool. The present application can effectively break the chips and does not need to open the blade chip breaking groove on the tool bit, which will not damage the tool bit and will not affect the regrinding frequency of the tool bit, and can meet the demand of high efficiency, economy and safety processing in the mechanical field.

Description

Technical Field

[0001] This utility model relates to the technical field of machining, and specifically to a cutting tool. Background Technology

[0002] In the field of machining, rotary cutting tools (such as reamers) are widely used in key processes such as hole machining of various workpieces due to their ability to achieve efficient and precise cutting. However, chip handling during the cutting process with these tools has always been a significant issue affecting machining efficiency and safety. If chips are not broken off and removed in time, they can easily become entangled on the machine tool spindle or cutting tool, which may not only scratch the workpiece surface and affect machining accuracy, but also, in severe cases, cause machine tool downtime, or even lead to equipment damage or personnel safety accidents.

[0003] To address this issue, Chinese Patent CN217668222U discloses a rotary high-power chip breaker tool. This tool uses chip breaker grooves on the cutting edge of a reamer to break the chips, which are then cleared by a cooling system, preventing chips from entangled in the spindle. However, this method of directly grooving the tool tip has significant drawbacks: machining the chip breaker grooves on the cutting edge causes structural damage to the tool tip itself, weakening its strength and durability. Furthermore, the grooving process not only increases manufacturing difficulty and cost but also significantly reduces the number of subsequent regrinding operations, thus shortening the overall lifespan of the tool.

[0004] Therefore, in view of the problems of chip breaking design of existing rotary cutting tools, such as damage to the cutting head and impact on regrinding performance, there is an urgent need to develop a new type of cutting tool structure that can effectively achieve chip breaking function, reduce damage to the cutting head, and ensure the number of regrinding cycles, so as to meet the needs of the machining field for efficient, economical and safe machining. Utility Model Content

[0005] The purpose of this utility model is to provide a cutting tool that can effectively break off the chips generated by the cutting head without damaging the cutting head or affecting the number of times the cutting head can be re-sharpened.

[0006] To achieve the above objectives, this application provides a cutting tool, comprising: a tool body and a cutting head.

[0007] The tool body is cylindrical, and a chip breaker groove is formed on the tool body. The cutting head is fixedly connected to the outer peripheral wall of the tool body. The chip breaker groove and the cutting head are spaced apart along a first direction. The side of the chip breaker groove away from the cutting head defines a chip breaking surface. The cutting head and the chip breaker groove both extend along the axial direction of the tool body. The length of the chip breaker groove is greater than the length of the cutting head, and the front end of the chip breaker groove protrudes from the front end of the cutting head.

[0008] As a preferred technical solution, the chip breaking groove is a V-shaped groove.

[0009] As a preferred technical solution, the included angle of the V-groove is δ, where 30°≤δ≤40°

[0010] As a preferred technical solution, the longitudinal cross-section of the chip-breaking surface is serrated / wavy.

[0011] As a preferred technical solution, a guide surface is provided between the chip-breaking surface and the tool body.

[0012] As a preferred technical solution, multiple cutter heads and multiple chip breaker grooves are provided, and the multiple cutter heads and multiple chip breaker grooves are arranged in a one-to-one correspondence.

[0013] As a preferred technical solution, the front end of the chip breaker groove protrudes beyond the front end of the cutter head by a length of L1, wherein L1 ≥ 1 mm.

[0014] As a preferred technical solution, the width of the chip breaker groove is W1, wherein 1mm≤W1≤1.5mm.

[0015] As a preferred technical solution, the depth of the chip breaking groove is H1, wherein 1.5mm≤H1≤2mm.

[0016] As a preferred technical solution, the distance between the chip breaker groove and the cutting head is D1, wherein 2.5mm≤D1≤3mm.

[0017] The cutting tool provided by the above technical solution has the following advantages compared with the prior art: When the tool body rotates at high speed to drive the cutting head to cut the workpiece, the chips will obtain a high linear velocity with the rotation of the tool body. When the chips enter the chip breaker groove, the inner wall of the chip breaker groove will physically block the chips. The chips collide with the inner wall of the chip breaker groove, and their ends will be forcibly pushed up or bent by the chip breaking surface. After exceeding the bending strength of the material, they will break, forming short and regular chips. Then, the chips are thrown out under the action of rotation. At the same time, the front end of the chip breaker groove protrudes from the front end of the cutting head, which can ensure that the chips enter the chip breaker groove and will not wrap around the tool. This application can effectively break the chips and does not require opening a chip breaker groove on the cutting edge of the cutting head, thus avoiding damage to the cutting head and not affecting the number of times the cutting head can be re-sharpened. It can meet the needs of the mechanical field for efficient, economical and safe processing. Attached Figure Description

[0018] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a partial schematic diagram of the cutting tool of this utility model;

[0020] Figure 2 This is a front view of the cutting tool of this utility model;

[0021] Figure 3 This is a partial schematic diagram of the cutting tool of this utility model;

[0022] Figure 4 This is a schematic diagram showing that the chip-breaking surface of the cutting tool of this utility model is wavy;

[0023] Figure 5 This is a schematic diagram showing that the chip-breaking surface of the cutting tool of this utility model is serrated;

[0024] The components are: 1. Tool body; 11. Chip breaker groove; 111. Chip breaker surface; 112. Guide surface; 2. Tool tip. Detailed Implementation

[0025] Preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary, and should not be construed as limiting the scope of protection of this application.

[0026] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0027] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0028] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0029] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0031] Please see Figure 1-3 The present application provides a cutting tool comprising: a cutting tool body 1 and a cutting head 2. The cutting tool body 1 is cylindrical and has a chip breaker groove 11. The cutting head 2 is fixedly connected to the outer peripheral wall of the cutting tool body 1. The chip breaker groove 11 and the cutting head 2 are spaced apart along a first direction. The side of the chip breaker groove 11 away from the cutting head 2 defines a chip breaking surface 111. The cutting head 2 and the chip breaker groove 11 both extend along the axial direction of the cutting tool body 1. The length of the chip breaker groove 11 is greater than the length of the cutting head 2, and the front end of the chip breaker groove 11 protrudes from the front end of the cutting head 2.

[0032] In this embodiment, the chip breaker groove 11 and the cutting head 2 are spaced apart on the outer peripheral wall of the tool body 1 along a first direction, and both extend in the same direction. When the tool body 1 rotates at high speed, driving the cutting head 2 to cut the workpiece, the chips enter the chip breaker groove 11 as the tool body 1 rotates. On the one hand, the sidewalls and bottom of the chip breaker groove 11 physically block the chips, restricting their free extension. The chips cannot continue to extend in the original direction, thus breaking at the stress concentration point. On the other hand, the chips have a high linear velocity as they move with the tool body 1. After entering the chip breaker groove 11, their ends are forcibly lifted or bent by the chip breaking surface 111. When the bending strength of the material is exceeded, they break, forming short, regular chips. On the other hand, the chips have already undergone plastic deformation when cut by the cutting tool, and there is a certain residual stress inside. The constraint effect of the chip breaker groove 11 will aggravate this deformation, causing the residual stress to concentrate and be released, thus promoting chip breakage. Subsequently, the chips are flung out by the high-speed rotation of the tool body 1, and will not remain in the chip breaker groove 11, affecting the subsequent chip breaking effect. Using the tool described in this application, chip breaking can be performed without opening chip breaker grooves on the cutting edge 2, without damaging the cutting edge 2, without affecting the number of regrinding cycles of the cutting edge 2, and without adversely affecting the overall service life of the tool.

[0033] Furthermore, during the cutting process, the chips extend forward in a certain direction as they flow from the cutting edge of the cutter head 2. If the front end of the chip breaker groove 11 is far from the cutting edge of the cutter head 2, the chips may flow a certain distance before entering the groove, resulting in excessively long and tough chips that are difficult to break. Therefore, in this embodiment, the front end of the chip breaker groove 11 is specifically designed to protrude beyond the front end of the cutter head 2 to ensure that the chips can enter the chip breaker groove 11 as soon as possible after formation, thus guaranteeing the chip breaking effect. Additionally, it is worth noting that the first direction mentioned in this embodiment refers to the rotation direction of the tool body 1.

[0034] In some embodiments, the chip breaker groove 11 is a V-shaped groove. The structure of the two inclined surfaces and the sharp corner at the bottom of the V-shaped groove can strongly constrain the chips generated during the cutting process, fundamentally solving the problems of excessively long and entangled chips. After the chips are separated by the cutting edge, they will naturally enter the included space of the V-shaped groove. The two inclined surfaces will exert a force that squeezes the chips inward, forcing the chips to bend and deform. As the cutting process progresses, the amount of deformation of the chips in the V-shaped groove gradually accumulates. When the stress exceeds the fracture limit of the material, it will precisely break along the bottom direction of the V-shaped groove or the direction of the inclined surface extension, forming short and regular chips. In addition, the broken chips will naturally slide down along the inclined direction of the V-shaped groove, and will not easily accumulate in the groove like flat-bottomed grooves. Furthermore, the sharp corner at the bottom of the V-shaped groove can reduce the contact area between the chips and the bottom of the groove, reducing frictional resistance, which is especially suitable for reducing chip adhesion when machining sticky materials (such as aluminum alloys and copper alloys).

[0035] Because tough materials (such as aluminum alloys) require a higher critical deformation for chip fracture, in some embodiments, the included angle of the V-groove is δ, where 30°≤δ≤40°. A V-groove with a small included angle (30°~40°) has a steeper convergence angle on both sides, resulting in a stronger compressive deformation force on the chip. Once the chip enters the groove, the two inclined surfaces quickly "converge" the chip towards the bottom corner of the groove, forcing the chip to undergo a greater amount of bending deformation, thus ensuring that tough materials such as aluminum alloys can fracture stably.

[0036] Smooth groove walls may slip due to high-speed chip flow, causing chips to detach from the groove wall and deviate from the preset path, resulting in poor breaking performance. Therefore, in some embodiments, the longitudinal cross-section of the chip-breaking surface 111 is serrated / wavy. Please refer to... Figure 4-5The serrated / wavy uneven structure increases friction through the mechanical engagement of the raised parts with the chips, fixing the chips within the chip breaker groove 11 and forcing them to flow in a parallel direction, preventing them from deviating from the preset path. Furthermore, if the inner wall of the chip breaker groove 11 is a smooth plane, the contact between the chips and the groove wall is line contact or partial surface contact, which can lead to localized wear of the groove wall over time, eventually causing failure. The serrated / wavy uneven structure distributes the force of the chips on the groove wall to multiple raised parts through multi-point contact, reducing the load on each raised part and slowing down the wear rate. Even if some raised parts wear, the others can still maintain their chip-breaking function, thus extending the service life of the chip breaker groove 11.

[0037] In some embodiments, a guide surface 112 is provided between the chip breaker surface 111 and the tool body 1. The guide surface 112 serves as a transition structure between the chip breaker groove 11 and the tool body 1, and can adapt to the changes in the groove depth / width of the chip breaker groove 11 to guide the gradual deformation of the chip and reduce the impact during the chip breaking process.

[0038] In some embodiments, multiple cutter heads 2 and multiple chip breaker grooves 11 are provided, with each cutter head 2 corresponding to one of the multiple chip breaker grooves 11. By providing multiple sets of cutter heads 2 and chip breaker grooves 11, when a previous cutter head 2 becomes unusable, the user can simply switch to the next cutter head 2 to continue cutting without replacing the cutter head 2 or the entire tool, thus avoiding the impact on processing efficiency due to component replacement.

[0039] The length of the chip breaker groove 11 needs to match the cutting edge of the cutter head 2 to ensure that all chips generated by the entire cutting edge can enter the chip breaker groove 11 and be intervened, avoiding local chip loss of control. Therefore, in some embodiments, the front end of the chip breaker groove 11 protrudes beyond the front end of the cutter head 2 by a length of L1, where L1 ≥ 1 mm.

[0040] To control the chip curl radius and adapt to the chip thickness, in some embodiments, the width of the chip breaker groove 11 is W1, where 1mm ≤ W1 ≤ 1.5mm. This width allows the chip to curl with a certain radius of curvature, resulting in more significant internal stress concentration during curling and making it easier to break. Simultaneously, it prevents the chip from getting stuck in the chip breaker groove 11, thus avoiding blockage.

[0041] To enhance chip breaking force and reduce chip removal resistance, in some embodiments, the depth of the chip breaking groove 11 is H1, where 1.5mm ≤ H1 ≤ 2mm. This depth allows the chip to embed more deeply into the groove, increasing the contact area with the groove bottom and side walls, resulting in stronger curling resistance and a more thorough chip breaking effect. Simultaneously, it ensures the necessary constraint force for chip breaking while allowing the broken chip to slide smoothly out of the groove, reducing chip removal resistance.

[0042] In some embodiments, the distance between the chip breaker groove 11 and the cutter head 2 is D1, wherein 2.5mm≤D1≤3mm. This embodiment controls the distance between the chip breaker groove 11 and the cutter head 2 to ensure that the chips, after being appropriately extended, accurately enter the chip breaker groove 11, curl to a specific length as expected, and break, thus ensuring smooth chip removal.

[0043] In summary, the cutting tool provided in this embodiment can effectively break the chips after the cutting head 2 has been cut by opening a chip breaking groove 11 on the tool body 1, without having to groove the cutting head 2, thus avoiding damage to the cutting head 2 and extending the service life of the cutting head 2.

[0044] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to implement the application, including making and using any device or system, employing suitable materials, and using any combination of methods. The scope of this application is defined by the claimed technical solution and includes other instances that would occur to those skilled in the art. Such other instances shall be considered to fall within the scope of protection defined by the claimed technical solution, provided that they include structural elements that are not different from the literal language of the claimed technical solution, or contain equivalent structural elements that are not substantially different from the literal language of the claimed technical solution.

Claims

1. A cutting tool, characterized in that, include: Tool body, tool tip, The tool body is cylindrical, and a chip breaker groove is formed on the tool body. The cutting head is fixedly connected to the outer peripheral wall of the tool body. The chip breaker groove and the cutting head are spaced apart along a first direction. The side of the chip breaker groove away from the cutting head defines a chip breaking surface. The cutting head and the chip breaker groove both extend along the axial direction of the tool body. The length of the chip breaker groove is greater than the length of the cutting head, and the front end of the chip breaker groove protrudes from the front end of the cutting head.

2. The cutting tool as described in claim 1, characterized in that, The chip-breaking groove is a V-shaped groove.

3. The cutting tool as described in claim 2, characterized in that, The included angle of the V-shaped groove is δ, where 30°≤δ≤40°.

4. The cutting tool as described in claim 1, characterized in that, The longitudinal cross-section of the chip-breaking surface is sawtooth / wavy.

5. The cutting tool as described in claim 1, characterized in that, A guide surface is provided between the chip-breaking surface and the tool body.

6. The cutting tool as described in claim 1, characterized in that, Multiple cutter heads and multiple chip breaker grooves are provided, and the multiple cutter heads and multiple chip breaker grooves are arranged in a one-to-one correspondence.

7. The cutting tool as described in claim 1, characterized in that, The front end of the chip breaker groove protrudes beyond the front end of the cutter head by a length of L1, where L1 ≥ 1 mm.

8. The cutting tool as described in claim 1, characterized in that, The width of the chip breaking groove is W1, where 1mm≤W1≤1.5mm.

9. The cutting tool as described in claim 1, characterized in that, The depth of the chip breaking groove is H1, where 1.5mm≤H1≤2mm.

10. The cutting tool as described in claim 1, characterized in that, The distance between the chip breaker groove and the cutting head is D1, where 2.5mm≤D1≤3mm.

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