Grooving insert for machining of end face annular groove, manufacturing method and cutting tool

Abstract

The present application relates to a kind of for end face circular ring groove processing groove cutter, manufacturing method and cutting tool, belong to metal cutting tool field.The existing grinding groove cutter adopts single rake angle and single side clearance angle structure, and the strength is insufficient due to the root being thinned, and processing vibration is big.The groove cutter of the present application divides the rake face into first rake angle section and second rake angle section, and second rake angle is smaller than first rake angle and second rake angle section length is greater than first rake angle section;First side clearance angle section and second side clearance angle section are divided to inside flank face, and second side clearance angle is smaller than first side clearance angle and second side clearance angle section length is greater than first side clearance angle section.Keep cutting performance and avoid function at the time of edge, so that root section height increases, width increases.It is verified by test, and tool life is promoted to 35 from 25, and the promotion amplitude reaches 40%.The segmented structure groove cutter of the present application has long service life, and the cutting ability of tool tip is stable.

Description

Technical Field

[0001] This application relates to the field of metal cutting tool technology, and in particular to a grooving insert, manufacturing method and cutting tool for machining annular grooves on end faces. Background Technology

[0002] Grooving is a common machining method for annular groove parts. For complex disk-shaped parts in aerospace and automotive turbine housings, which have complex annular grooves, grooving tools usually need to be custom-designed. Custom grooving inserts are generally formed by grinding carbide blanks, and due to the limitations of the grinding process, their cutting edges usually adopt a single rake angle and a single side clearance angle structure.

[0003] Taking the machining of annular grooves on the end face as an example, Figure 1 This is a schematic diagram of machining annular grooves on the end face of a grooving insert in the prior art. In this diagram, 8 is the original grooving insert in the prior art, 801 is the original rake face, 802 is the original side face, and 9 is the workpiece. Figure 2 A three-dimensional schematic diagram of a groove cutting blade in the prior art is shown; Figure 3 This illustrates that in the prior art, the grooving insert has a one-piece formed original rake angle. ; Figure 4 This illustrates that in the prior art, the grooving insert has a one-piece formed original side clearance angle. This cutting edge shape facilitates chip removal and heat dissipation, and the manufacturing process for grooving inserts is simple. However, the original rake angle... Compared with the original side gap angle The blades meet at the root, increasing the root height of the cutting blade. and width The value is too low, which severely weakens the strength of the cutting tool. In end face grooving, this type of grooving tool has insufficient strength and is prone to vibration, especially after the grooving tool wears down. The vibration becomes more obvious, resulting in surface marks, dimensional instability, and in severe cases, even chipping or scrapping of the part.

[0004] How to enhance the strength of the cutting tool root and suppress machining vibration while ensuring chip removal and heat dissipation performance is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to provide a grooving insert, its manufacturing method, and an end-face grooving cutting tool to solve the technical problems of insufficient root strength, large machining vibration, and short tool life caused by the single rake angle and single side clearance angle structure of existing ground grooving inserts. To solve the above technical problems, the present invention adopts the following technical solution:

[0006] In a first aspect, a grooving insert for machining annular grooves on an end face is provided. The grooving insert includes an insert body having a rake face and a side face. The side face includes an inner side face facing the inner wall of the annular groove and an outer side face facing the outer wall of the annular groove. The rake face has a first rake angle segment and a second rake angle segment sequentially arranged in a direction extending from the main cutting edge into the insert body. The first rake angle segment has a first rake angle. The second anterior angle segment has a second anterior angle. The first front corner With the second front corner The following conditions must be met: ; length of the first front corner segment The length of the second front corner segment The following conditions must be met: .

[0007] The inner cutting edge is provided with a first side clearance angle segment and a second side clearance angle segment in sequence in the direction extending from the secondary cutting edge into the interior of the tool body. The first side clearance angle segment has a first side clearance angle. The second side gap segment has a second side gap angle. The first side gap angle With the second side clearance angle The following conditions must be met: ; the length of the first side gap segment Length of the second side gap segment The following conditions must be met: .

[0008] Optionally, the outer blade face has a third side clearance angle. The third side gap angle With the first side gap angle The following conditions must be met: .

[0009] Optionally, the first front corner With the second front corner The difference satisfies: .

[0010] Optionally, the first side clearance angle With the second side clearance angle The difference satisfies: .

[0011] Optionally, the length of the first front corner segment The length of the second front corner segment The following conditions must be met: .

[0012] Optionally, the length of the first side gap segment Length of the second side gap segment The following conditions must be met: .

[0013] Optionally, the length of the first front corner segment satisfy: .

[0014] Optionally, the first front corner The second front angle is 10°. The first side gap angle is 2°. The second side clearance angle is 10°. It is 3°.

[0015] Secondly, a method for manufacturing a grooving insert includes the following steps: First, grinding the rake face of the grooving insert blank to form a second rake angle segment; Second, grinding the cutting edge area to form a first rake angle segment based on the ground second rake angle segment; Third, grinding the inner face of the grooving insert blank to form a second side clearance angle segment; Fourth, grinding the cutting edge area to form a first side clearance angle segment based on the ground second side clearance angle segment.

[0016] Thirdly, a face grooving tool includes a tool holder and a grooving insert as described above, mounted on the tool holder.

[0017] The beneficial effects of the technical solution provided in this application include at least the following: the grooving insert provided in this application divides the rake face into a first rake angle segment and a second rake angle segment, and makes the second rake angle... Smaller than the first front angle Length of the second front corner segment Greater than the length of the first front corner segment This method maintains the original cutting sharpness and chip removal smoothness at the cutting edge while increasing the cross-sectional thickness and height of the root section in the cutting feed direction. It involves dividing the inner tool face into a first clearance angle segment and a second clearance angle segment, and making the second clearance angle... Less than the first side gap angle Length of the second side gap segment Greater than the length of the first side gap segment This allows the clearance at the cutting edge to be maintained or increased, while the amount of material retained at the root in the cutting depth direction is increased, and the root width is increased.

[0018] The segmented rake face and the segmented inner rake face act independently on two perpendicular directions at the root of the grooving insert, together increasing the root cross-sectional area and improving the root's bending resistance in both directions. After rake face optimization, the actual contact length between the chip and the rake face decreases, the contact area decreases accordingly, frictional work decreases, and the rake face wear rate decreases. Simultaneously, the contact time between the chip and the rake face is shortened, reducing the time window for heat transfer from the chip to the grooving insert. More heat is carried away with the chip, reducing the proportion of heat transferred to the grooving insert body and mitigating heat deposition, softening, and adhesive wear on the rake face. The segmented grooving insert of this embodiment has a long lifespan and stable tip cutting capability.

[0019] This application also provides a method for manufacturing a grooving insert. By first grinding the small-angle section at the root and then grinding the large-angle section at the cutting edge, less material is removed from the small-angle section at the root, and the resulting surface can be used as a positioning reference surface for subsequent grinding. When grinding the large-angle section in the cutting edge area, the position and angle of the cutting edge can be precisely controlled on the already formed reference surface, ensuring a clear boundary and accurate angle transition between the two sections.

[0020] This application also provides a face grooving tool, comprising a tool holder and the aforementioned grooving insert mounted on the tool holder, which can reliably achieve all the beneficial effects of the aforementioned grooving insert.

[0021] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the machining of annular grooves on the end face using a grooving insert in the prior art;

[0024] Figure 2 A three-dimensional schematic diagram of a groove cutting blade in the prior art is shown;

[0025] Figure 3 This illustrates that in the prior art, the grooving insert has a one-piece formed original rake angle. ;

[0026] Figure 4 This illustrates that in the prior art, the grooving insert has a one-piece formed original side clearance angle. ;

[0027] Figure 5This is a schematic diagram of the annular groove on the end face of the grooving tool provided in the embodiment of this application;

[0028] Figure 6 The cutting tool face of the grooving insert provided in this embodiment of the application has a first rake angle segment and a second rake angle segment;

[0029] Figure 7 The inner cutting face of the grooving insert provided in this application embodiment has a first side clearance angle segment and a second side clearance angle segment.

[0030] Explanation of reference numerals in the attached figures

[0031] 1-Rake face; 101-First rake angle section; 102-Second rake angle section; 2-Inner side face; 201-First side clearance angle section; 202-Second side clearance angle section; 3-Outer side face; 8-Original grooving insert; 801-Original rake face; 802-Original side face; 9-Workpiece. Detailed Implementation

[0032] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0033] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, while "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this application are for distinguishing one element from another and do not imply sequentiality or importance. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0034] The present application will now be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0035] refer to Figures 1 to 4 In this article, This indicates the original rake angle of the original groove cutting tool 8 in the prior art. This indicates the original side clearance angle of the original cutting insert 8 in the prior art. This indicates the height of the original eight cutting blades in the existing technology. This indicates the width of the original cutting blade at the root of the existing technology (8 roots).

[0036] refer to Figures 5 to 7 , This indicates the first rake angle of the cutting insert in this application. This indicates the second rake angle of the cutting insert in this application. This indicates the first side clearance angle of the cutting insert in this application. This indicates the second side clearance angle of the cutting insert in this application. This indicates the third clearance angle of the outer cutting face of the cutting insert in this application; Indicates the length of the first front angle segment. Indicates the length of the second front angle segment. Indicates the length of the first side gap segment. Indicates the length of the second side gap segment; This indicates the height of the root of the cutting blade in this application. This indicates the width of the root of the cutting blade in this application.

[0037] Firstly, reference Figures 5 to 7 This embodiment relates to a grooving insert for machining annular grooves on end faces.

[0038] refer to Figure 5 The annular groove on the end face has a shaft diameter side (inner wall) near the center of rotation and a bore diameter side (outer wall) away from the center of rotation. The shaft diameter side has a larger clearance and can be designed flexibly; the bore diameter side has limited clearance, and generally requires a larger clearance space, but the space for flexible design is limited. Based on this difference in working conditions, this embodiment only optimizes the inner cutting face 2 in segments, while the outer cutting face 3 retains its original structure.

[0039] refer to Figures 5 to 7 The grooving insert includes an insert body having a front face 1 and a side face. The side face includes an inner side face 2 facing the inner wall of the annular groove on the end face and an outer side face 3 facing the outer wall of the annular groove on the end face.

[0040] This embodiment is an improvement based on existing grooving inserts. (Reference) Figure 3 Existing technology for grooving inserts uses a single rake angle. The rake angle remains the same from the edge to the root. A larger rake angle makes the edge sharp and chip removal smooth, but it also thins the blade at the root, increasing the root height. The value is relatively small.

[0041] refer to Figure 6 The rake face 1 is divided into a first rake angle segment 101 and a second rake angle segment 102 in the direction extending from the main cutting edge into the tool body. The first rake angle segment 101 is located on the cutting edge side and has a first rake angle. The second anterior horn segment 102 is located on the root side and has a second anterior horn. First front corner Greater than the second anterior angle .

[0042] Compared with using a single front corner Compared to existing technology for grooving inserts, and The cutting edges are basically consistent (difference not exceeding 2°), maintaining the original cutting sharpness and chip removal smoothness. The geometry of the cutting edges involved in material removal remains unchanged, and the average cutting force remains stable. (Second rake angle) smaller than the original front angle This increases the cross-sectional thickness of the root section in the cutting feed direction, and the root height is reduced from... Increase to ,For example The edge sharpness remained unchanged, while the root height... The cutting inserts used in this technology are actually larger than those in existing technologies. The length of the first rake angle segment 101 is... The length of the second front corner segment 102 is less than This ensures that the small-angle area at the root occupies most of the length of the rake face 1, thus ensuring that the root receives thickened support throughout the entire groove depth.

[0043] After optimizing the rake face 1, the chip exit angle and contact path change. The actual contact length between the chip and the rake face 1 decreases, and under the condition that the cutting width remains unchanged, the contact area between the chip and the rake face 1 decreases accordingly. After the contact area decreases, the frictional contact area between the chip and the rake face 1 per unit time decreases, the frictional work decreases, and the wear rate of the rake face 1 decreases.

[0044] The total cutting heat during the cutting process consists of shear deformation heat and frictional heat from the rake face 1, which is carried away by the chips, the grooving insert, and the workpiece 9. When the contact length of the rake face 1 decreases, the contact time between the chips and the rake face 1 is shortened, and the time for heat transfer from the chips to the grooving insert is reduced. This allows more heat to be carried away with the chips, reducing the proportion of heat transferred to the grooving insert body, thereby mitigating heat deposition, thermal softening, and adhesive wear on the rake face 1.

[0045] refer to Figure 4 Existing technology for grooving inserts uses a single side clearance angle. The clearance angle remains the same from the cutting edge to the root. A larger clearance angle allows for sufficient clearance from the cutting edge and good heat dissipation, but it also thins the blade at the root, increasing the root width. The value is relatively small.

[0046] refer to Figure 7 The inner cutting face 2 is divided into a first side clearance angle segment 201 and a second side clearance angle segment 202 in the direction extending from the secondary cutting edge into the interior of the tool body. The first side clearance angle segment 201 is located on the cutting edge side and has a first side clearance angle. The second side gap segment 202 is located on the root side and has a second side gap angle. First side gap angle Greater than the second side gap angle .

[0047] Compared with using a single side gap angle Compared with existing technology for slotting inserts, the first side clearance angle Not less than the original side clearance angle (The difference should not exceed 2°) to maintain or increase the clearance at the cutting edge, ensuring that heat dissipation conditions do not deteriorate; second side clearance angle Smaller than the original side clearance angle This increases the amount of material retained behind the cutting edge in the cutting depth direction, correspondingly increasing the root support volume and the root width from... Increase to The actual value can be . The edge avoidance performance was not reduced, but the root width actually increased.

[0048] Length of the first side gap corner segment 201 The length of the second side gap corner segment 202 is less than This ensures that the small-angle support area at the root occupies most of the length of the inner cutting surface 2, thus ensuring that the root is supported and reinforced throughout the entire groove depth.

[0049] The first segment of the rake face and the second segment of the inner face each act independently in two perpendicular directions at the root of the grooving insert. The first segment of the rake face causes the root height to change from... Increase to The inner blade is divided into two sections, which makes the root width change from... Increase to Both factors contribute to an increase in the cross-sectional area of ​​the root, thereby enhancing the root's bending resistance in both directions.

[0050] This embodiment divides the design of the grooving insert into two functional areas: the cutting edge area and the support area. The geometry of the cutting edge area is basically the same as that of the original grooving insert, participating in direct material removal and ensuring that the average cutting force and cutting behavior do not change abruptly. The root area of ​​the grooving insert is reinforced as a structural support area to improve the edge support stiffness, reduce the impact of chips on the root arc of the rake face 1, and reduce the contact area and contact time between the chips and the rake face 1.

[0051] According to the embodiments of this application, refer to Figure 7 The outer blade face 3 has a third side clearance angle. Third side gap angle Greater than the first side clearance angle The outer wall (aperture side) is far from the rotation center of workpiece 9, has a smaller machining trajectory curvature, and the risk of interference between the insert side and the machined surface is lower than that of the inner wall. Therefore, the third side clearance angle... It can be set to a first clearance angle greater than that of the inner cutting edge side. This design ensures that the clearance on the outer side wall is no less than that on the inner side wall, fully meeting the clearance requirements for machining the outer side. Simultaneously, during machining of the outer side wall, the cutting force direction is away from the center of rotation, and the root of the insert is under compressive stress. Under compression, the root is less sensitive to cross-sectional reduction than under tension. Therefore, given that the outer side clearance angle already meets the clearance requirements, there is no need to increase the root support volume through segmented design.

[0052] Third side gap angle Set to a first clearance angle not less than that of the inner cutting edge side. Ensure that the clearance between the outer side wall and the inner side wall is not less than that between the outer side wall to meet the clearance requirements for processing on the outer side.

[0053] According to the embodiments of this application, refer to Figure 6 First front corner With the second front corner The difference is limited to between 7° and 20°.

[0054] To determine the range of this difference, a comparative cutting test was conducted on a vertical lathe. The test used heat-resistant stainless steel, with a groove depth of 4.5 mm, a cutting speed of 120 m / min, and a feed rate of 0.05 mm / r. While maintaining the first rake angle... Under the condition that remains unchanged, change the second anterior angle. The values ​​of were used to test the cutting force, vibration acceleration, and tool wear under various differential conditions.

[0055] The test data are as follows: When the difference is 5°, the tool life is only 28 pieces; when the difference is 7°, the vibration acceleration drops to 4.1m / s², and the tool life increases to 35 pieces; when the difference is 10.5°, the tool life reaches 38 pieces; when the difference is 20°, the tool life is 35 pieces; when the difference is 22°, the surface roughness of the annular groove exceeds the standard.

[0056] The test results show that when the difference is too small, the root thickening effect is insufficient; when the difference is too large, the surface roughness of the annular groove exceeds the standard. When the difference is within the range of 7° to 20°, the tool life reaches more than 35 pieces, and the machined surface quality meets the requirements. Based on the above test results, and The difference range is limited to 7° to 20°.

[0057] According to the embodiments of this application, refer to Figure 7 First side gap angle With the second side gap angle The difference is limited to between 3° and 7°.

[0058] To determine the range of this difference, comparative cutting tests were conducted on a vertical lathe. This was done while maintaining the first backlash angle. Under the condition of no change, change the second side gap angle The values ​​of were used to test the cutting force, vibration acceleration, and tool wear under various differential conditions.

[0059] The test data are as follows: When the difference is 2°, the root support is insufficient and the tool life is only 26 pieces; when the difference is 3°, the tool life increases to 35 pieces; when the difference is 6°, the tool life reaches 38 pieces; when the difference is 7°, the tool life is 35 pieces; when the difference is 9°, too much root material is removed, the impact resistance decreases, and chipping occurs under intermittent cutting conditions.

[0060] The experimental results show that when the difference is too small, the increase in root support volume is insufficient; when the difference is too large, the root strength decreases. When the difference is within the range of 3° to 7°, the tool life reaches more than 35 pieces, and the root strength and cutting edge avoidance performance are balanced. Based on the above experimental results, and The difference range is limited to 3° to 7°.

[0061] According to the embodiments of this application, refer to Figure 6 The length of the first front corner segment 101 Length of the second front corner segment 102 The following conditions must be met: .

[0062] To determine this proportional range, a comparative cutting test was conducted on a vertical lathe. Test conditions: heat-resistant stainless steel material, groove depth 4.5 mm, cutting speed 120 m / min, feed rate 0.05 mm / r. The first rake angle was fixed. Second front corner and the length of the second front corner segment 102 Change the length of the first front angle segment 101 The values ​​were tested in multiple groups. Chip morphology and tool life under ratio conditions.

[0063] The experimental data are as follows: When At that time, the chips changed from continuous curls to short segments, and the surface roughness decreased. It is 3.8μm; when At that time, the chips are discharged in a continuous spiral curl. Down to ;when At that time, the tool life reaches 40 pieces; when At that time, the tool life is 35 pieces; when At that time, insufficient root support reduced the tool life to 26 pieces.

[0064] The test results show that When the ratio is too small, the cutting function of the cutting edge is insufficient; when the ratio is too large, the root support is compressed. Within the range of 0.33 to 0.67, chip removal is smooth, and tool life reaches over 35 pieces. Based on the above test results, and The proportion range is limited to .

[0065] According to the embodiments of this application, refer to Figure 7 The length of the first side gap segment 201 Length of the second side gap corner segment 202 The following conditions must be met: .

[0066] To determine this range, comparative cutting tests were conducted on a vertical lathe. The first backlash angle was fixed. Second side gap angle and the length of the second side gap corner segment 202 Change the length of the first side gap segment 201 The values ​​were tested in multiple groups. Cutting force and tool life under ratio conditions.

[0067] The experimental data are as follows: When At that time, the tool life was only 24 pieces; when At that time, the tool life reaches 35 pieces; when At that time, the tool life reaches 40 pieces; when At that time, the tool life is 40 pieces; when At that time, the vibration resistance effect was not obvious.

[0068] The test results show that When the ratio is too small, the cutting edge cannot avoid damage; when the ratio is too large, the root support is compressed. Within the range of 0.33 to 0.67, the tool life reaches more than 35 pieces. Based on the above test results, and The proportion range is limited to .

[0069] According to an embodiment of this application, the first front corner It is 10°, the second front angle. The first side gap angle is 2°. The second side gap angle is 10°. It is 3°.

[0070] In the cutting test, the original rake angle was fixed. Original side gap angle With the parameters unchanged, multiple angle combinations were tested. The overall performance was evaluated based on factors such as cutting force, vibration acceleration, tool wear, and machined surface quality. , , , The combined scheme showed the best overall performance among all groups of tests.

[0071] The numerical results were verified in a comparative cutting test on the end face annular groove of an automotive turbocharger housing (experimental conditions: groove width 3.5mm, groove depth 4.5mm, material heat-resistant stainless steel, linear speed 120m / min, feed rate 0.05mm / r, tool life set to 35 pieces). The segmented grooving insert with this angle combination could stably machine to the set life, with only a few vibration marks and ablation marks appearing on the bottom and sides of the groove. In contrast, the original grooving insert without the segmented structure showed a large number of vibration marks and ablation marks after machining about 25 pieces under the same conditions.

[0072] Secondly, this application also provides a method for manufacturing the above-mentioned grooving insert, wherein the grinding sequence of the method is as follows: First, the rake face 1 of the grooving insert blank is ground to form a second rake angle segment 102; Second, based on the ground second rake angle segment 102, a first rake angle segment 101 is formed in the cutting edge area; Third, the inner side face 2 of the grooving insert blank is ground to form a second side clearance angle segment 202; Fourth, based on the ground second side clearance angle segment 202, a first side clearance angle segment 201 is formed in the cutting edge area.

[0073] First, grind the two corner segments of the rake face 1, then grind the two corner segments of the inner face 2, ensuring that the segmented machining in the two directions is carried out independently and without interference. In each direction, grind the root segment with the smaller angle first, then grind the cutting edge segment with the larger angle. When grinding the root segment with the smaller angle first, less material is removed, and the resulting surface can be used as a positioning reference surface for subsequent grinding; when grinding the large angle segment in the cutting edge area, the position and angle of the cutting edge can be precisely controlled on the already formed reference surface.

[0074] The grinding sequence in this embodiment ensures a clear boundary and accurate angle transition between the two sections.

[0075] Thirdly, this application also provides a face grooving tool, comprising a tool holder and the aforementioned grooving insert mounted on the tool holder. One end of the tool holder has a groove for mounting the insert, and the grooving insert is fixed in the groove of the tool holder by fasteners. This tool is used for machining annular grooves on the face of a vertical lathe. During machining, the insert moves along the feed direction with the tool holder, the rake face 1 of the insert contacts the chip, and the side face faces the groove wall.

[0076] refer to Figures 1 to 7The working principle of this application will be explained below with a specific embodiment.

[0077] This embodiment is for machining the end face groove of an automotive turbocharger housing. The material being machined is heat-resistant stainless steel, the groove width is 3.5mm, and the groove depth S=4.5mm.

[0078] The blade substrate is made of cemented carbide blank. In this embodiment, the original rake angle... Original side gap angle First front corner Second front corner First side gap angle Second side gap angle Third side gap angle The first front angle segment is 101 units long. The length of the second front corner segment 102 ; Length of the first side gap corner segment 201 The length of the second side gap corner segment 202 .

[0079] The grinding process is performed on a CNC tool grinder. The grinding sequence is as follows: first grind the second rake angle section 102. Then grind the first rake angle segment 101 in the cutting edge area. First grind the second side clearance angle segment 202. Then grind the first clearance angle segment 201 in the cutting edge area. The outer blade face 3 maintains the third clearance angle. No segmented grinding is performed. After grinding is completed, the root height is measured. and width ,confirm Greater than , Greater than .

[0080] The ground grooving insert is installed in the groove of the tool holder and secured with clamping screws, then mounted on the tool post of the vertical lathe. During machining, the grooving insert cuts into the end face of workpiece 9 at a linear speed of 120 m / min and a feed rate of 0.05 mm / r along the feed direction. At the rake face 1, the chip first contacts... First rake angle segment 101; the chip enters after passing the first rake angle segment 101. In the second front corner segment 102 region, the actual contact length is limited to Within the range. At point 2 on the inner cutting face, a groove is formed between the side of the cutting insert and the inner wall of the groove. Clearance for avoidance; in the root region, The second side gap corner segment 202 makes the root section width wider than the original structure.

[0081] When machining to the bottom of the groove, the small-angle section at the root consistently covers the root area throughout the entire machining stroke. Comparative tests were conducted on the grooving inserts before and after optimization under the same cutting conditions. Before optimization, the grooving insert developed numerous vibration marks and ablation traces after machining approximately 25 pieces; the grooving insert with the segmented structure of this embodiment could stably machine up to the set life of 35 pieces, with only a few vibration marks and ablation traces appearing on the bottom and sides of the groove. The cutting capability of the tool tip remained stable, and the instantaneous impact and periodic load fluctuations experienced by the grooving insert as a whole were reduced. Through machining using this embodiment, the single-edge life stably reached the set life of 35 pieces.

[0082] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0083] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A grooving insert for machining annular grooves on an end face, comprising an insert body having a rake face (1) and a side face, the side face including an inner side face (2) for facing the inner wall of the annular groove on the end face, and an outer side face (3) for facing the outer wall of the annular groove on the end face, characterized in that: The rake face (1) is provided with a first rake angle segment (101) and a second rake angle segment (102) in sequence in the direction extending from the main cutting edge into the tool body. The first rake angle segment (101) has a first rake angle. The second anterior angle segment (102) has a second anterior angle. The first front corner With the second front corner The following conditions must be met: ; length of the first front corner segment (101) The length of the second front corner segment (102) The following conditions must be met: ; The inner cutting edge (2) is provided with a first side clearance angle segment (201) and a second side clearance angle segment (202) in sequence in the direction extending from the secondary cutting edge into the interior of the tool body. The first side clearance angle segment (201) has a first side clearance angle. The second side clearance angle segment (202) has a second side clearance angle. The first side gap angle With the second side clearance angle The following conditions must be met: ; the length of the first side gap corner segment (201) The length of the second side gap segment (202) The following conditions must be met: .

2. The grooving blade according to claim 1, characterized in that: The outer blade (3) has a third side clearance angle. The third side gap angle With the first side gap angle The following conditions must be met: .

3. The grooving blade according to claim 1, characterized in that: First front corner With the second front corner The difference satisfies: .

4. The grooving blade according to claim 1, characterized in that: First side gap angle With the second side clearance angle The difference satisfies: .

5. The grooving blade according to claim 1, characterized in that: Length of the first front corner segment (101) The length of the second front corner segment (102) The following conditions must be met: .

6. The grooving blade according to claim 1, characterized in that: Length of the first side gap segment (201) The length of the second side gap segment (202) The following conditions must be met: .

7. The grooving blade according to claim 1, characterized in that: Length of the first front corner segment (101) satisfy: .

8. The grooving blade according to claim 1, characterized in that: First front corner The second front angle is 10°. The first side gap angle is 2°. The second side clearance angle is 10°. It is 3°.

9. A method for manufacturing a grooving blade as described in any one of claims 1 to 8, characterized in that: Includes the following steps: The first step is to grind the rake face of the grooving insert blank to form the second rake angle segment; The second step is to grind the first rake angle section in the cutting edge area based on the already ground second rake angle section; The third step is to grind the inner side of the cutting tool blank to form the second side clearance angle segment. The fourth step is to grind the first side clearance angle segment in the cutting edge area on the basis of the already ground second side clearance angle segment.

10. A face grooving tool, comprising a tool holder and a grooving insert as described in any one of claims 1 to 8 mounted on the tool holder.

Images