A rolling scraper blade

Abstract

The utility model discloses a kind of roll scrapers, including blade main body, the blade main body includes working part and positioning part, working part and positioning part are about blade main body center symmetry, the positioning part one side is equipped with bottom mounting surface, the positioning part other side is equipped with rake face, main cutting edge and finishing edge are sequentially equipped on the rake face, multiple segmentation grooves are spaced apart and set on the rake face along finishing edge direction, the segmentation groove is separated into multiple independent finishing edge sections by finishing edge, and the groove direction of segmentation groove is perpendicular to blade feeding direction.The utility model is equipped with finishing edge segmentation groove, changes the cutting angle of main cutting edge, so that radial component force is less than axial component force, realizes low resistance cutting.

Description

Technical Field

[0001] This utility model belongs to the field of blade research and manufacturing technology, and in particular, relates to a rotary scraping blade. Background Technology

[0002] Scraping and burnishing inserts are the core cutting components in the scraping and burnishing process (also known as single-edge boring or scraping and burning). This process is mainly used for the finishing of deep holes, especially holes with a large length-to-diameter ratio, such as hydraulic cylinder barrels, air cylinder barrels, and gun barrels.

[0003] The working principle of hobbing cutters is similar to that of plunge milling and boring milling. The cutting edge parallel to the tool feed direction is the finishing edge, and the other edge is the main cutting edge. The core deficiency of existing hobbing inserts lies in the unreasonable distribution of cutting force, leading to a high risk of tool vibration. In the first generation of hobbing inserts, the main cutting edge bears all the cutting force, while the finishing edge only plays a finishing role and does not participate in the sharing of cutting force. The cutting force of the main cutting edge is completely concentrated in the axial direction. After the cutting edge wears (especially in the later stages of wear), the cutting force will change significantly, causing the insert to vibrate. In the second generation of hobbing inserts, the main cutting edge is subjected to excessively concentrated force or the radial component is greater than the axial component. The excessive radial component will still cause radial vibration of the tool (tool vibration phenomenon), especially in the machining of high-hardness materials or high feed rate scenarios, and the vibration risk has not been fundamentally eliminated. Therefore, the unbalanced force distribution of existing hobbing inserts results in insufficient dynamic stability of the tool, making it difficult to meet the requirements of high-precision and high-load machining.

[0004] Existing patent publication number CN222806215U discloses a high-efficiency, high-precision indexable gear hob insert, which relates to gear machining tools. It solves the problem of low machining accuracy due to errors in insert shape. This utility model's indexable carbide tooth flank insert has an inwardly concave arc shape on the L side and an outwardly convex arc shape on the R side. However, the hob insert of this patent experiences a large cutting force on its cutting edge during machining, making it prone to vibration and difficult to guarantee the machining accuracy of the parts. Utility Model Content

[0005] This invention addresses the issue that in the first generation of hobbing inserts, the main cutting edge bears all the cutting force, while the finishing edge only serves a finishing function and does not participate in the sharing of cutting force. The cutting force of the main cutting edge is completely concentrated in the axial direction. After the cutting edge wears (especially in the later stages of wear), the cutting force will change significantly, causing the insert to vibrate. In the second generation of hobbing inserts, the main cutting edge is subjected to excessively concentrated force or the radial component is greater than the axial component. The excessive radial component will still cause radial vibration of the tool (vibration). Especially in the case of machining high-hardness materials or high feed rate scenarios, the vibration risk has not been fundamentally eliminated. Therefore, a hobbing insert with low cutting force is proposed.

[0006] A rotary scraper blade includes a blade body, which includes a working part and a positioning part. Both the working part and the positioning part are symmetrical about the center of the blade body. The positioning part has a bottom mounting surface on one side and a rake face on the other side. The rake face has a main cutting edge and a finishing edge arranged sequentially. Multiple dividing grooves are arranged at intervals along the finishing edge direction on the rake face. The dividing grooves divide the finishing edge into multiple independent finishing edge segments, and the groove opening direction is perpendicular to the blade feed direction.

[0007] Furthermore, the number of the dividing grooves is 3 to 6, and the dividing grooves are evenly distributed along the direction of the polishing blade.

[0008] Furthermore, the principal cutting edge angle of the main cutting edge is 20°, and the cutting force on the main cutting edge is decomposed into radial component and axial component, wherein the radial component accounts for less than 50% of the total cutting force.

[0009] Furthermore, the angle between the main cutting edge and the finishing edge is an obtuse angle, and a transition arc with a radius of 0.1 to 0.2 mm is provided at the connection between the main cutting edge and the finishing edge.

[0010] Furthermore, the angle between the rake face and the side of the positioning part is 14°.

[0011] Furthermore, the dividing groove is a rectangular groove or a V-shaped groove, with a depth of 0.5 to 1 mm and a width of 1 to 3 mm, and the width direction of the groove is parallel to the length direction of the finishing blade.

[0012] Furthermore, the spacing between adjacent dividing slots is 2 to 4 mm.

[0013] Furthermore, a screw hole is provided at the geometric center of the blade body, and the screw hole extends through the entire blade body for fixing the blade body to the cutter head.

[0014] Furthermore, the blade body is made of cemented carbide and has a wear-resistant coating on its surface.

[0015] Furthermore, the rake face includes a main cutting edge rake face and a finishing edge rake face, and the finishing edge rake face and the main cutting edge rake face are smoothly transitioned to form a continuous rake face.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model includes a blade body, which comprises a working part and a positioning part. Both the working part and the positioning part are symmetrical about the center of the blade body. One side of the positioning part has a bottom mounting surface, and the other side has a rake face. The rake face has a main cutting edge and a finishing edge arranged sequentially. Multiple dividing grooves are spaced along the finishing edge direction on the rake face, dividing the finishing edge into multiple independent finishing edge segments. The groove openings are perpendicular to the blade feed direction. This utility model, by setting the finishing edge dividing grooves, adjusts the cutting angle of the main cutting edge to achieve low cutting force cutting. The reduced radial force improves the dynamic stability of the tool, reduces machining vibration, and significantly improves machining accuracy and surface quality.

[0018] 2. The acute-angle structure of the dividing groove design of this utility model can guide the cutting force to shift axially, reduce the ratio of radial force to axial force, and further suppress the vibration phenomenon; on the other hand, the inclined surface design of the dividing groove can help the chips to be discharged to both sides, reduce chip accumulation and blockage, and is especially suitable for deep hole machining. Attached Figure Description

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

[0020] Figure 2 This is a schematic diagram of the structure of the scraping blade in Example 1;

[0021] Figure 3 This is a side view of the present invention;

[0022] Figure 4 This is a front view of the present invention;

[0023] Figure 5 This is a schematic diagram of the force distribution on the main cutting edge of this utility model.

[0024] In the above figure, 1. blade body; 2. main cutting edge; 3. finishing edge; 4. rake face; 5. positioning part; 6. bottom mounting surface; 7. dividing groove; 8. screw hole. Detailed Implementation

[0025] To clearly illustrate the technical features of this utility model, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, in the description of this utility model, it should be understood 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, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 of this utility model. 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or 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" 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 utility model. 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 may be combined in any suitable manner in one or more embodiments or examples.

[0030] Example 1

[0031] like Figure 1As shown, a rotary scraper blade includes a blade body 1. The blade body 1 includes a working part and a positioning part 5. Both the working part and the positioning part 5 are symmetrical about the center of the blade body 1. The positioning part 5 has a bottom mounting surface 6 on one side and a rake face 4 on the other side. The rake face 4 is provided with a main cutting edge 2 and a finishing edge 3 in sequence. Multiple dividing grooves 7 are provided at intervals along the direction of the finishing edge 3 on the rake face 4. The dividing grooves 7 divide the finishing edge 3 into multiple independent finishing edge segments, and the groove opening direction of the dividing grooves 7 is perpendicular to the blade feed direction.

[0032] like Figures 1 to 4 As shown, in this embodiment, a through screw hole 8 with a diameter of 3mm is provided at the geometric center of the blade body 1, which is fixed to the cutter head by screws. The blade body 1 is divided into a working part and a positioning part 5, which are symmetrical about the center. One side of the positioning part 5 is the bottom mounting surface 6, and the other side is the rake face 4. The rake face 4 is provided with a main cutting edge 2 and a finishing edge 3 in sequence, and the included angle between them is an obtuse angle. In this embodiment, the main cutting edge 2 and the finishing edge 3 are set at 120°. A transition arc is provided at the connection between the main cutting edge 2 and the finishing edge 3. The radius of the transition arc is 0.1mm to reduce stress concentration and prevent chipping; at the same time, it guides the chips to be discharged smoothly and avoids the chips from accumulating and scratching the surface of the workpiece.

[0033] like Figure 1 As shown, in this embodiment, the blade body 1 has five V-shaped dividing grooves 7 evenly arranged along the direction of the finishing edge 3, with the groove opening direction perpendicular to the feed direction of the blade. Each dividing groove 7 has a depth of 0.8 mm and a width of 2 mm, with adjacent dividing grooves spaced 2 mm apart. The dividing grooves 7 divide the finishing edge 3 into six independent cutting segments, which are connected by the groove edges of the dividing grooves 7, guiding the cutting force to deflect axially and further suppressing vibration. The five evenly spaced dividing grooves 7 optimize stress distribution while ensuring the finishing function. Too few dividing grooves 7 result in insufficient dispersion, while too many weaken the cutting edge strength. Even distribution ensures balanced cutting force and prevents localized stress concentration.

[0034] like Figure 1 , Figure 4 as well as Figure 5 As shown, the principal cutting edge 2 has a principal cutting edge angle of 20°. The cutting force is decomposed into radial and axial components, with the radial component accounting for 40% (less than 50%). By adjusting the principal cutting edge angle, the cutting angle of the main cutting edge is changed, making the radial component less than the axial component, thus achieving low-resistance cutting and reducing vibration. The rake face 4 includes the main cutting edge rake face and the finishing edge rake face, and the finishing edge rake face and the main cutting edge rake face transition smoothly to form a continuous rake face 4. The angle between the rake face 4 and the side of the positioning part 5 is 14°.

[0035] The V-shaped dividing groove 7 enhances the segmentation effect of the finishing edge and reduces the concentration of cutting heat; the angle design of the main cutting edge 2 further optimizes the force ratio (radial force < axial force), and combined with the cemented carbide substrate and coating, it reduces cutting force while improving tool life.

[0036] Example 2

[0037] like Figure 1 As shown, a rotary scraper blade includes a blade body 1. The blade body 1 includes a working part and a positioning part 5. Both the working part and the positioning part 5 are symmetrical about the center of the blade body 1. The positioning part 5 has a bottom mounting surface 6 on one side and a rake face 4 on the other side. The rake face 4 is provided with a main cutting edge 2 and a finishing edge 3 in sequence. Multiple dividing grooves 7 are provided at intervals along the direction of the finishing edge 3 on the rake face 4. The dividing grooves 7 divide the finishing edge 3 into multiple independent finishing edge segments, and the groove opening direction of the dividing grooves 7 is perpendicular to the blade feed direction.

[0038] In this embodiment, the insert body 1 is made of ultra-fine grain cemented carbide, and the diameter of the central screw hole 8 is set to 4mm for installation and fixation. The screw hole 8 is used with countersunk screws for fixation, which increases the bonding strength between the insert and the tool body by 30% and effectively prevents displacement vibration during high-speed cutting. The surface of the insert body 1 is coated with a TiAlN coating with a thickness of 3μm, which improves the wear resistance and hot hardness of the insert.

[0039] The side of the positioning part 5 forms a symmetrical structure with an angle of 14° with the plane where the front face is located. The angle between the main cutting edge 2 and the finishing edge 3 is 110°. A transition arc is provided at the connection point with a radius of 0.15mm. A 90° rigid reference is formed through the double positioning surface. The tool installation error can be controlled within ±0.005mm, avoiding uneven cutting force caused by installation deviation.

[0040] In this embodiment, three rectangular dividing grooves are evenly arranged along the finishing edge direction, with the groove openings perpendicular to the feed direction. Each dividing groove has a depth of 0.5 mm and a width of 1 mm, with a spacing of 4 mm between adjacent grooves. This divides the finishing edge into four independent cutting segments, ensuring that each segment works independently and with uniform load, avoiding excessively dense grooves that could weaken the cutting edge. The principal cutting edge angle is 20°, and the cutting force on the main cutting edge is decomposed into radial and axial components, with the radial component accounting for 45%. By segmenting the finishing edge through the dividing grooves, the cutting force is distributed across multiple independent cutting segments, significantly reducing the continuous cutting resistance of the finishing edge and achieving low-resistance cutting.

[0041] When the blade is working, the dividing groove 7 will divide the finishing edge into segments, reducing the cutting resistance of a single cutting edge; the main cutting edge 2 is designed with a main rake angle so that the radial component force is less than the axial component force, which, together with the rake face 4 angle, reduces cutting chatter and achieves low-resistance cutting.

[0042] Example 3

[0043] like Figure 1 As shown, a rotary scraper blade includes a blade body 1. The blade body 1 includes a working part and a positioning part 5. Both the working part and the positioning part 5 are symmetrical about the center of the blade body 1. The positioning part 5 has a bottom mounting surface 6 on one side and a rake face 4 on the other side. The rake face 4 is provided with a main cutting edge 2 and a finishing edge 3 in sequence. Multiple dividing grooves 7 are provided at intervals along the direction of the finishing edge 3 on the rake face 4. The dividing grooves 7 divide the finishing edge 3 into multiple independent finishing edge segments, and the groove opening direction of the dividing grooves 7 is perpendicular to the blade feed direction.

[0044] In this embodiment, the insert body 1 is made of coated cemented carbide. The insert body 1 is coated with a composite coating process (TiCN bottom layer + aluminum oxide top layer) with a total thickness of 5μm, which is suitable for high-load cutting scenarios. The central screw hole 8 has a diameter of 5mm to accommodate heavy-duty cutter heads. The angle between the rake face 4 and the side of the positioning part 5 is 14°, the angle between the main cutting edge 2 and the finishing edge 3 is 100°, and the radius of the transition arc at the connection is set to 0.2mm.

[0045] Six rectangular dividing grooves 7 are set, each with a depth of 1 mm and a width of 1.5 mm. The spacing between adjacent dividing grooves 7 is set to 2 mm, and the finishing blade 3 is evenly divided into 7 independent cutting segments. The principal cutting edge angle is 20°, the radial force accounts for 35%, and the axial force dominates the cutting process, significantly reducing the risk of oscillation.

[0046] In this embodiment, the scraping blade further refines the finishing edge segment 3 by high-density dividing grooves 7 (6), and reduces the contact area between the cutting edge and the workpiece by the maximum groove depth (1mm); the main cutting edge force 2 component optimization combined with the composite coating achieves dual performance improvement of low cutting force and high wear resistance, and is suitable for precision machining of high-strength materials (such as quenched and tempered steel).

[0047] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rolling skive blade comprising a blade body, characterised in that, The blade body includes a working part and a positioning part, both of which are symmetrical about the center of the blade body. The positioning part has a bottom mounting surface on one side and a rake face on the other side. The rake face has a main cutting edge and a finishing edge in sequence. Multiple dividing grooves are spaced along the finishing edge direction on the rake face. The dividing grooves divide the finishing edge into multiple independent finishing edge segments, and the groove opening direction is perpendicular to the blade feed direction.

2. A rolling knife blade according to claim 1, wherein The number of the dividing grooves is 3 to 6, and the dividing grooves are evenly distributed along the direction of the polishing blade.

3. A rotary scraper blade according to claim 1, characterized in that, The principal cutting edge angle is 20°. The cutting force on the principal cutting edge is decomposed into radial and axial components, with the radial component accounting for less than 50% of the total cutting force.

4. A rotary scraper blade according to claim 1, characterized in that, The angle between the main cutting edge and the finishing edge is an obtuse angle, and a transition arc with a radius of 0.1 to 0.2 mm is provided at the connection between the main cutting edge and the finishing edge.

5. A rotary scraper blade according to claim 1, characterized in that, The angle between the rake face and the side of the positioning part is 14°.

6. A rotary scraper blade according to claim 1, characterized in that, The dividing groove is a rectangular groove or a V-shaped groove, with a depth of 0.5 to 1 mm and a width of 1 to 3 mm. The width direction of the groove is parallel to the length direction of the finishing blade.

7. A rotary scraper blade according to claim 6, characterized in that, The spacing between adjacent dividing slots is 2 to 4 mm.

8. A rotary scraper blade according to claim 1, characterized in that, A screw hole is provided at the geometric center of the blade body, and the screw hole runs through the entire blade body for fixing the blade body to the cutter head.

9. A rotary scraper blade according to claim 1, characterized in that, The blade body is made of cemented carbide and has a wear-resistant coating on its surface.

10. A rotary scraper blade according to claim 1, characterized in that, The rake face includes the main cutting edge rake face and the finishing edge rake face, and the finishing edge rake face and the main cutting edge rake face are smoothly transitioned to form a continuous rake face.

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