A cemented carbide insert

Abstract

The application provides a cemented carbide blade, which comprises a blade body, the blade body has an upper surface, a lower surface and a central hole for positioning and fixing the blade body on a cutter; the lower surface is sequentially provided with a first empty platform, a first mounting end surface, a second mounting end surface and a second empty platform along the direction of the edge of the outer side to the edge of the central hole; the first mounting end surface has a first inclination angle alpha 1 towards the second mounting end surface, and the second mounting end surface has a second inclination angle alpha 2 towards the second empty platform; the first mounting end surface and the second mounting end surface satisfy alpha 2>alpha 1. In the application, the mounting surface structure of the blade is changed, the influence caused by the deformation of the blade after sintering is avoided, the fit degree of the blade and the blade rod or the blade disc is ensured, the grinding process is reduced, the production cost is saved, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of cutting alloy inserts, and more particularly to a cemented carbide insert. Background Technology

[0002] In mechanical metal cutting, cemented carbide inserts are widely used due to their advantages of large cutting depth and large feed rate.

[0003] However, sintering deformation is a significant issue in the production of cemented carbide cutting tools. This is because cemented carbide is composed of high-hardness carbides (such as WC and TiC) and a metallic binder phase (usually cobalt or nickel). The carbides and binder phase in cemented carbide have different coefficients of thermal expansion, leading to internal stress after high-temperature sintering and causing localized deformation of the product.

[0004] The mounting surface of the existing alloy cutting tool is flat. Due to sintering deformation, the highest point of the deformation on the mounting surface is located at the center hole position; as shown in the attached... Figure 1 As shown, when the sintered and deformed alloy insert 10 is installed with the cutter head or tool holder, the sintering deformation causes a protrusion on the mounting surface of the insert, resulting in a gap with an angle α between the sintered and deformed alloy insert 10 and the assembly plane of the cutter head or tool holder, leading to poor fit. The deformation of the insert is further exacerbated by the sintering deformation, affecting its service life. The existing angle α gap also causes unstable clamping or uneven clamping force, subjecting the sintered and deformed alloy insert 10 to abnormal stress during operation, resulting in severe overall deformation. Furthermore, the angle α gap significantly reduces the machining accuracy of the workpiece, increasing the defect rate during processing. Therefore, a grinding process is required during the assembly and application of the sintered and deformed alloy insert 10. This grinding process flattens the mounting surface of the sintered and deformed alloy insert 10, ensuring a tight fit between the mounting surface and the assembly surface of the cutter head or tool holder. Combined with appendix Figure 2 As shown, the mounting surface of the ground alloy blade 20 undergoes a fine grinding process to remove the protruding parts caused by sintering deformation, making the mounting surface flat overall. Due to its high hardness, the alloy blade requires repeated grinding and measurement steps after sintering deformation to meet the flatness requirements of the mounting surface. It can be seen that the grinding process is an important process for dealing with sintered deformed alloy blades. After a long operation and multi-directional measurement, the grinding process meets the assembly requirements.

[0005] Therefore, grinding can significantly improve the assembly accuracy of alloy inserts, thereby extending their service life and indirectly ensuring improved workpiece machining accuracy. However, grinding is a cumbersome process with strict precision requirements, and it is also time-consuming, impacting production efficiency. The root cause is that the mounting surface of existing alloy inserts is generally planar, making deformation during sintering inevitable and uncontrollable. This leads to numerous additional steps in the later assembly onto the cutter head or tool holder, requiring measurement of the sintering deformation, determination of the grinding position and thickness of the mounting surface, and lengthy grinding operations. These steps greatly increase the manufacturing cost of alloy inserts and fail to fundamentally address the issues of extending their service life and improving workpiece machining accuracy after assembly. Summary of the Invention

[0006] This application provides a cemented carbide insert that, by changing the structure of the insert's mounting surface, avoids the effects of insert deformation after sintering, thereby ensuring the fit between the insert and the tool holder or tool head, reducing grinding processes, saving production costs, and improving production efficiency.

[0007] This application provides a cemented carbide insert comprising: an insert body having an upper surface, a lower surface, and a central hole for positioning and fixing the insert body on a cutting tool; the lower surface having a first clearance platform, a first mounting end face, a second mounting end face, and a second clearance platform sequentially arranged along the outer side facing the edge of the central hole; wherein the first mounting end face has a first tilt angle α1 facing the second mounting end face, and the second mounting end face has a second tilt angle α2 facing the second clearance platform; the first mounting end face and the second mounting end face satisfy: α2 > α1.

[0008] In this application, by changing the mounting surface structure of the blade body, the blade body undergoes a small amount of deformation during sintering, and the protruding position with a small amount of deformation avoids the mounting position around the mounting hole. The mounting end face of the blade body and the assembly surface of the tool holder or tool disc achieve a good fit without grinding.

[0009] The first clearance platform prevents burrs caused by assembly gaps at the bottom from interfering with the bottom mounting surface; the first mounting end face ensures better fit between the blade body and the tool holder or tool disc; the second mounting end face avoids the impact on installation caused by deformation after sintering, resulting in the inner side being higher than the outer side. Simultaneously, a larger second clearance platform is added at the center hole position to prevent burrs and deformation at the edge of the center hole.

[0010] Therefore, by changing the structure of the cutting tool body itself, the deformation during the sintering process can be offset. The second mounting end face and the second clearance platform can effectively suppress the impact of sintering deformation on the first mounting end face. The fit between the first mounting end face and the tool holder or tool head is greatly improved, thus eliminating the need for measurement or grinding processes, improving production efficiency. Furthermore, the design of the clearance platform reduces the amount of alloy raw materials used, lowering production costs. This fundamentally optimizes and reduces the sintering deformation of the cutting tool body, extends its service life, and indirectly meets the requirement for improved workpiece machining accuracy.

[0011] In one specific implementation, the distance between the outer surface of the lower surface and the edge of the central hole is L; The width of the first clearance platform and the first mounting end face is L1; The width of the second mounting end face is L2; The width of the second shelter platform is L3; wherein, The width of L1 is 1 / 2 to 1 / 4 of the width of L, the width of L2 is 1 / 2 to 1 / 4 of the width of L, and the width of L3 is 1 / 2 to 1 / 4 of the width of L.

[0012] In one specific feasible implementation, the height of the first shelter platform is H2, and the width of the first shelter platform is L4; wherein, The height of H2 is between 0.01mm and 0.3mm; The width of L4 is between 0.01mm and 0.3mm.

[0013] In one specific implementation, the interior of the first shelter platform has an inclination angle α4, the angle of which is between 30° and 70°.

[0014] In one specific implementation, the angle of the first tilt angle α1 is between 0.1° and 1°.

[0015] In one specific implementation, the angle of the second tilt angle α2 is between 2° and 5°.

[0016] In one specific feasible implementation, the height of the second shelter platform is H1; wherein... The height of H1 is between 0.1 mm and 0.5 mm.

[0017] In one specific implementation, the interior of the second shelter platform has an inclination angle α3, the angle of which is between 10° and 70°. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the assembly of an existing alloy cutting tool after sintering and deformation. Figure 2 This is a schematic diagram of the assembly of an existing alloy cutting tool after grinding. Figure 3-5 This is an assembly diagram of the carbide cutting tool provided in an embodiment of this application; Figure 6 An assembly cross-sectional view of a carbide cutting tool provided in an embodiment of this application; Figure 7 A first-view structural schematic diagram of a cemented carbide cutting tool provided in an embodiment of this application; Figure 8 A second-view structural schematic diagram of the cemented carbide cutting tool provided in an embodiment of this application; Figure 9 A bottom view of a carbide cutting tool provided in an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the first air-avoiding platform provided in an embodiment of this application; Figure 11 A partial cross-sectional view of the alloy blade provided in an embodiment of this application.

[0019] Icon labels: Cutter head body-1, blade body-100, center hole-110, upper surface-120, side surface-130, lower surface-140, first clearance platform-141, first mounting end face-142, second mounting end face-143, second clearance platform-144. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] To facilitate understanding of the carbide inserts provided in this application, their application scenario is first explained. Existing carbide inserts have a planar mounting surface. Due to the deformation of the mounting surface after sintering, the highest point of deformation is located at the center hole, resulting in poor fit with the tool holder or cutter head. This necessitates additional grinding, increasing production costs. Furthermore, the poor fit after sintering causes even more severe deformation during use, affecting service life. Additionally, unstable clamping or uneven clamping force causes abnormal stress on the insert during operation, leading to severe deformation. Therefore, this application provides a carbide insert that, by changing the mounting surface structure, avoids the effects of deformation after sintering, thereby ensuring a good fit between the insert and the tool holder or cutter head, reducing grinding steps, saving production costs, and improving production efficiency.

[0023] First, refer to Figure 1 and Figure 2 As shown, the mounting surface of the existing alloy cutting tool is a plane. Due to the deformation caused by sintering, the highest point of the deformation of the mounting surface is located at the center hole position; as shown in the attached figure. Figure 1 As shown, when the sintered and deformed alloy insert 10 is installed with the cutter head or tool holder, the sintering deformation causes a protrusion on the mounting surface of the insert, resulting in a gap with an angle α between the sintered and deformed alloy insert 10 and the assembly plane of the cutter head or tool holder, leading to poor fit. The deformation of the insert is further exacerbated by the sintering deformation, affecting its service life. The existing angle α gap also causes unstable clamping or uneven clamping force, subjecting the sintered and deformed alloy insert 10 to abnormal stress during operation, resulting in severe overall deformation. Furthermore, the angle α gap significantly reduces the machining accuracy of the workpiece, increasing the defect rate during processing. Therefore, a grinding process is required during the assembly and application of the sintered and deformed alloy insert 10. This grinding process flattens the mounting surface of the sintered and deformed alloy insert 10, ensuring a tight fit between the mounting surface and the assembly surface of the cutter head or tool holder. Combined with appendix Figure 2 As shown, the mounting surface of the ground alloy blade 20 undergoes a fine grinding process to remove the protruding parts caused by sintering deformation, making the mounting surface flat overall. Due to its high hardness, the alloy blade requires repeated grinding and measurement steps after sintering deformation to meet the flatness requirements of the mounting surface. It can be seen that the grinding process is an important process for dealing with sintered deformed alloy blades. After a long operation and multi-directional measurement, the grinding process meets the assembly requirements.

[0024] Therefore, grinding can significantly improve the assembly accuracy of alloy inserts, thereby extending their service life and indirectly ensuring improved workpiece machining accuracy. However, grinding is a cumbersome process with strict precision requirements, and it is also time-consuming, impacting production efficiency. The root cause is that the mounting surface of existing alloy inserts is generally planar, making deformation during sintering inevitable and uncontrollable. This leads to numerous additional steps in the later assembly onto the cutter head or tool holder, requiring measurement of the sintering deformation, determination of the grinding position and thickness of the mounting surface, and lengthy grinding operations. These steps greatly increase the manufacturing cost of alloy inserts and fail to fundamentally address the issues of extending their service life and improving workpiece machining accuracy after assembly.

[0025] For the reasons mentioned above, the carbide inserts provided in this application can control the sintering deformation by modifying their structural factors, and reduce grinding processes. The sintered carbide inserts can be directly applied to tool holders or tool heads to achieve a high degree of fit. Specifically, refer to... Figures 3-5 As shown, Figure 3 , Figure 4 as well as Figure 5 The diagram shows a schematic of the carbide insert of this application mounted on the tool holder 1; it should be understood that the carbide insert of this application also has a good mounting fit when mounted on the tool holder. Figures 3-5 As can be seen, the cutter head 1 has multiple mounting positions for mounting carbide inserts circumferentially, and each mounting position has a mounting surface for mates with the carbide insert. The mounting surface on the cutter head 1 is a plane, and each carbide insert is mounted on the corresponding mounting position by bolts. When the mounting end face of the carbide insert in this application mates with the mounting surface, the two have a high degree of fit, reducing the grinding process, thereby improving the service life of the carbide insert and improving the machining accuracy of the workpiece.

[0026] For details, please refer to Figures 6-11As shown in the illustration, the carbide insert provided in this application includes an insert body 100. To avoid the need for additional grinding steps due to deformation during product sintering, which would complicate the process and increase production costs, or to address issues such as poor fit due to assembly problems affecting the insert's lifespan, the insert body 100 fundamentally solves the problem of controllable deformation during the sintering process by altering the structure of the mounting surface. This reduces production steps, saves production costs, improves production efficiency, and extends the lifespan of the insert body 100. Specifically, the insert body 100 can be adapted to various types of tool holders or tool discs, exhibiting good versatility. The existing alloy inserts have a 0° mounting surface, and after sintering and deformation, the highest point of the mounting surface is located around the center hole, thus forming an assembly gap with an inclination angle of α. This requires grinding when installing the alloy insert with the tool holder or tool head, increasing the workload and making it difficult to effectively control the overall grinding accuracy. This results in poor fit during the later installation process and abnormal stress during use, leading to increased deformation of the alloy insert and affecting its service life.

[0027] Therefore, the insert body 100 in this application reduces the deformation during the sintering process by changing the shape of the mounting surface, and shifts the highest point of the smaller deformation of the mounting surface to the periphery of the central hole 110. Specifically, the insert body 100 has an upper surface 120, a lower surface 140, and a central hole 110 for positioning and fixing the insert body 100 on the tool. A cutting end face is formed between the upper surface 120 and the side surface 130. The overall insert body 100 is a polygonal insert or a circular insert, and the lower surface 140 of the insert body 100 is the mounting surface. It can be seen that by changing the mold shape of the mounting surface, the sintering deformation of the insert body 100 in this application can be fundamentally controlled. The sintering deformation position avoids the contact position with the assembly surface of the tool holder or tool disc 1, ensuring the installation stability of the insert body 100 and the tool holder or tool disc 1, reducing the impact of burrs on the mounting surface, while ensuring stable clamping performance and uniform clamping force, extending the service life of the insert body 100, and improving the machining accuracy requirements of the workpiece.

[0028] Combination Figure 8 and Figure 9As can be seen, the lower surface 140, along the edge direction of the outer side 130 towards the central hole 110, is sequentially provided with a first clearance platform 141, a first mounting end face 142, a second mounting end face 143, and a second clearance platform 144. The first clearance platform 141 is located on the outer ring of the lower surface 140 to prevent burrs generated at the bottom due to assembly gaps from interfering with the bottom mounting surface. The height of the first clearance platform 141 is H2, and the width of the first clearance platform 141 is L4. The height of H2 is between 0.01mm and 0.3mm, and the width of L4 is between 0.01mm and 0.3mm. In a specific embodiment of this application, the height of H2 is 0.15mm, and the width of L4 is 0.1mm.

[0029] Furthermore, an angle α4 is made at a distance L4, where α4 is 30°-70°, and in one specific embodiment of this application, α4 ​​is 45°. It can be seen that the first clearance platform 141 prevents burrs generated at the bottom due to assembly gaps from interfering with the bottom mounting surface.

[0030] In addition, combined Figure 8 and Figure 11 As shown, the first mounting end face 142 has a first tilt angle α1 towards the second mounting end face 143, and the second mounting end face 143 has a second tilt angle α2 towards the second clearance platform 144; the first mounting end face 142 and the second mounting end face 143 satisfy the condition: α2 > α1. The first mounting end face 142 is to ensure better fit between the blade body 100 and the blade holder or blade disc. The second mounting end face 143 is to prevent deformation after sintering, which would cause the inner side of the product to be higher than the outer side, thus affecting the installation.

[0031] When specifically dividing the first mounting end face 142, the second mounting end face 143, and the second clearance platform 144, the distance between the outer side surface 130 of the lower surface 140 and the edge of the central hole 110 is L; the width of the first clearance platform 141 and the first mounting end face 142 is L1; the width of L1 is 1 / 2 to 1 / 4 of L; the width of the second mounting end face 143 is L2; ​​the width of L2 is 1 / 2 to 1 / 4 of L; the width of the second clearance platform 144 is L3; the width of L3 is 1 / 2 to 1 / 4 of L. In a specific embodiment of this application, the width of L1 is 1 / 3 of L, the width of L2 is 1 / 3 of L, and the width of L3 is 1 / 3 of L, thereby achieving an even distribution, reducing the processing complexity, and simplifying the processing. As can be seen, the highest position of the sintered and deformed blade body 100 in this application is on the width of L1, and it gradually tilts from the outside towards the central hole 110. The central hole 110 is relatively flat, thereby greatly improving the problem of installation affected by sintering deformation.

[0032] Furthermore, specifically, the first tilt angle α1 of the first mounting end face 142 is less than the second tilt angle α2 of the second mounting end face 143, with the first tilt angle α1 being between 0.1° and 1°, and the second tilt angle α2 being between 2° and 5°. In a specific embodiment of this application, the first tilt angle α1 is 0.5°, and the second tilt angle α2 is 3°; thereby ensuring that the first mounting end face 142 provides better fit between the blade body 100 and the tool holder or tool disc. The second mounting end face 143 avoids the inner side of the product being higher than the outer side due to deformation after sintering, which would affect installation; by changing the structure of the mounting surface, grinding processes are reduced, production costs are lowered, and production efficiency is improved.

[0033] Combination Figure 3 and Figure 5 As shown, a second clearance platform 144 is provided around the center hole 110 on the lower surface 140 of this application. The width of the second clearance platform 144 is L3, and the height of the second clearance platform 144 is H1; wherein the height of H1 is between 0.1mm and 0.5mm.

[0034] The second clearance platform 144 has an inclination angle α3 at a distance L3, where α3 is between 10° and 70°. In a specific embodiment of this application, the height of H1 is 0.3 mm, and the inclination angle α3 is 30°. It can be seen that by adding a larger second clearance platform 144 at the center hole 110, burrs and deformation at the edge of the center hole 110 can be prevented from affecting the installation effect.

[0035] In this application, by changing the mounting surface structure of the blade body, the blade body undergoes a small amount of deformation during sintering, and the protruding position with a small amount of deformation avoids the mounting position around the mounting hole. The mounting end face of the blade body and the assembly surface of the tool holder or tool disc achieve a good fit without grinding.

[0036] The first clearance platform prevents burrs caused by assembly gaps at the bottom from interfering with the bottom mounting surface; the first mounting end face ensures better fit between the blade body and the tool holder or tool disc; the second mounting end face avoids the impact on installation caused by deformation after sintering, resulting in the inner side being higher than the outer side. Simultaneously, a larger second clearance platform is added at the center hole position to prevent burrs and deformation at the edge of the center hole.

[0037] Therefore, by changing the structure of the cutting tool body itself, the deformation during the sintering process can be offset. The second mounting end face and the second clearance platform can effectively suppress the impact of sintering deformation on the first mounting end face. The fit between the first mounting end face and the tool holder or tool head is greatly improved, thus eliminating the need for measurement or grinding processes, improving production efficiency. Furthermore, the design of the clearance platform reduces the amount of alloy raw materials used, lowering production costs. This fundamentally optimizes and reduces the sintering deformation of the cutting tool body, extends its service life, and indirectly meets the requirement for improved workpiece machining accuracy.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification, which are not provided in detail for the sake of brevity.

[0039] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections for other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0040] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. A cemented carbide cutting tool, comprising: A blade body, the blade body having an upper surface, a lower surface, and a central hole for positioning and fixing the blade body onto a cutting tool; characterized in that... The lower surface is provided with a first clearance platform, a first mounting end face, a second mounting end face, and a second clearance platform sequentially along the edge direction from the outer side towards the central hole; wherein, The first mounting end face has a first tilt angle α1 facing the second mounting end face, and the second mounting end face has a second tilt angle α2 facing the second clearance platform; The first mounting end face and the second mounting end face satisfy the condition: α2 > α1.

2. The cemented carbide cutting tool according to claim 1, characterized in that, The distance between the outer side of the lower surface and the edge of the central hole is L; The width of the first clearance platform and the first mounting end face is L1; The width of the second mounting end face is L2; The width of the second shelter platform is L3; wherein, The width of L1 is 1 / 2 to 1 / 4 of the width of L, the width of L2 is 1 / 2 to 1 / 4 of the width of L, and the width of L3 is 1 / 2 to 1 / 4 of the width of L.

3. The cemented carbide cutting tool according to claim 2, characterized in that, The height of the first shelter platform is H2, and the width of the first shelter platform is L4; wherein, The height of H2 is between 0.01mm and 0.3mm; The width of L4 is between 0.01mm and 0.3mm.

4. The cemented carbide cutting tool according to claim 3, characterized in that, The interior of the first shelter platform has an inclination angle α4, which is between 30° and 70°.

5. The cemented carbide cutting tool according to claim 1, characterized in that, The angle of the first tilt angle α1 is between 0.1° and 1°.

6. The cemented carbide cutting tool according to claim 5, characterized in that, The angle of the second tilt angle α2 is between 2° and 5°.

7. The cemented carbide cutting tool according to claim 2, characterized in that, The height of the second shelter platform is H1; where, The height of H1 is between 0.1 mm and 0.5 mm.

8. The cemented carbide cutting tool according to claim 7, characterized in that, The interior of the second shelter platform has an inclination angle α3, which is between 10° and 70°.

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