Bar stock and cutting tools for manufacturing cutting tools
By using composite bar design, the composite material formed by the high-hardness target shank and the tough inner core solves the problems of vibration and cutting edge damage of ceramic tools in the manufacturing of integral end mills, improves the toughness and vibration reduction performance of the tool, and extends its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN GOLDEN EGRET SPECIAL ALLOY
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-03
Smart Images
Figure CN224444631U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of cutting tool technology, and in particular to a bar stock and a cutting tool for manufacturing cutting tools. Background Technology
[0002] Ceramic materials are a new type of material in the cutting industry, with a hardness far exceeding that of high-hardness steel and cemented carbide. They are currently widely used in the manufacture of indexable inserts, but their application in solid end mill manufacturing is still in its early stages. This is because ceramic materials have very high hardness but very low toughness, making them prone to vibration during grinding and workpiece machining. This vibration can lead to tool edge damage or even complete tool breakage, causing production safety accidents. Utility Model Content
[0003] This application provides a bar stock for manufacturing cutting tools. It solves the problem of poor cutting stability in existing ceramic cutting tools. The technical solution is as follows:
[0004] On one hand, a bar stock for manufacturing cutting tools is provided, the bar stock for manufacturing cutting tools comprising:
[0005] The target is the handle, the inner core, and the ceramic blade head;
[0006] The target tool holder has a mounting through hole arranged along the axial direction of the target tool holder, and one end has an annular first end face;
[0007] The inner core is fixed in the mounting through hole, and the end of the inner core near the first end face has a second end face; the material of the inner core is different from the material of the target handle, the target handle is made of a metal material with high hardness relative to the inner core, and the inner core is made of a metal material with high flexibility relative to the target handle.
[0008] One end face of the ceramic blade head is fitted and fixedly connected to the first end face of the target handle and the second end face of the inner core. The material of the ceramic blade head is different from the material of the target handle and the inner core.
[0009] Optionally, the shape of the inner core matches the shape of the mounting through hole, and the outer side of the inner core is fitted and fixed to the inner sidewall of the mounting through hole.
[0010] Optionally, the first end face of the target shank portion and / or the second end face of the inner core portion have a first positioning element, and one end face of the ceramic blade head has a second positioning element that cooperates with the first positioning element.
[0011] Optionally, one of the first positioning member and the second positioning member is a recessed portion, and the other of the first positioning member and the second positioning member is a protruding portion that mates with the recessed portion.
[0012] Optionally, the outer diameter of the target tool holder is D1, and the diameter of the circumscribed circle of the inner core is D2, wherein 1 / 4D1≤D2≤2 / 3D1.
[0013] Optionally, the outer diameter of the ceramic blade head is D3, wherein D3 ≥ D1 + 0.2 mm.
[0014] Optionally, the length of the target handle is L1, the length of the inner core is L2, and the length of the ceramic blade head is L3, wherein L1=L2≥2L3.
[0015] Optionally, the material of the target tool holder includes: high-speed steel and cemented carbide.
[0016] Optionally, the material of the inner core includes stainless steel and titanium alloy.
[0017] On the other hand, a cutting tool is provided, which is made from bar stock. The cutting tool includes a head and a shank, the head corresponding to a ceramic head in the bar stock, and the shank corresponding to a target shank and an inner core in the bar stock. The bar stock is any of the bar stock given above.
[0018] The beneficial effects of the technical solutions provided in this application include at least the following:
[0019] The target shank and the inner core together form the shank of the tool to be machined. The shank is made of a composite material, consisting of a target shank made of a material with higher hardness and an inner core made of a material with higher toughness. This composite material helps avoid chipping on the cutting edge due to a large difference in hardness between the shank and the ceramic cutting tip during end mill manufacturing. It also improves tool toughness, enhances the vibration damping performance of the ceramic cutting tool, and extends tool life. Furthermore, fixing the ceramic cutting tip to the composite shank improves the toughness of the bar stock, providing better vibration damping during component machining. Attached Figure Description
[0020] 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.
[0021] Figure 1 This is a cross-sectional view of a bar stock for preparing cutting tools provided in an embodiment of this application;
[0022] Figure 2 This is a cross-sectional view of a target tool holder provided in an embodiment of this application;
[0023] Figure 3This is a cross-sectional view of an inner core provided in an embodiment of this application;
[0024] Figure 4 This is a cross-sectional view of a ceramic knife head provided in an embodiment of this application;
[0025] Figure 5 This is a schematic diagram of a first positioning element installed on the inner core.
[0026] Figure 6 This is a schematic diagram of another type of second positioning component installed on the inner core;
[0027] Figure 7 This is a cross-sectional schematic diagram of a target tool holder and an inner core provided in an embodiment of this application;
[0028] Figure 8 This is a cross-sectional schematic diagram of another target tool holder and inner core provided in an embodiment of this application;
[0029] Figure 9 This is a top view of a ceramic knife head provided in an embodiment of this application;
[0030] Figure 10 This is a cross-sectional view of another bar stock for preparing cutting tools provided in an embodiment of this application;
[0031] Figure 11 Is adopted Figure 10 A schematic diagram of a cutting tool made from bar stock is shown.
[0032] The tool includes a target handle portion 100, an inner core portion 200, a ceramic tool head portion 300, a mounting through hole 101, a first end face m1, a second end face m2, a first positioning element d1, and a second positioning element d2.
[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0036] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
[0037] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of a bar stock for preparing cutting tools provided in an embodiment of this application. The bar stock is a composite bar stock, suitable for preparing solid end mills for machining materials such as stainless steel and high-temperature alloys. The bar stock for preparing cutting tools may include: a target shank portion 100, an inner core portion 200, and a ceramic cutter head 300.
[0038] The target tool holder portion 100 may have a mounting through hole 101 provided along the axial direction L of the target tool holder portion 100, and one end of the target tool holder portion 100 may have an annular first end face m1.
[0039] The inner core 200 can be fixed inside the mounting through hole 101 of the target tool holder 100. The end of the inner core 200 near the first end face m1 of the target tool holder 100 can have a second end face m2. The material of the inner core 200 can be different from the material of the target tool holder 100. The target tool holder 100 can be made of a metal with high hardness relative to the inner core 200, while the inner core 200 can be made of a metal with high flexibility relative to the target tool holder 100.
[0040] One end face of the ceramic blade head 300 can be fitted and fixedly connected to both the first end face m1 of the target handle portion 100 and the second end face m2 of the inner core portion 200. The material of the ceramic blade head 300 is different from the materials of the target handle portion 100 and the inner core portion 200. For example, one end face of the ceramic blade head 300 can be fixedly connected to the first end face m1 of the target handle portion 100 and the second end face m2 of the inner core portion 200 by welding.
[0041] In this embodiment, the target shank portion 100 and the inner core portion 200 constitute the shank portion of the tool to be machined. The shank portion is made of a composite material composed of the target shank portion 100 made of a material with higher hardness and the inner core portion 200 made of a material with higher toughness. This design avoids notches on the cutting edge due to excessive differences in hardness between the shank portion and the ceramic cutter head 300 during end mill manufacturing, while also improving tool toughness, increasing the vibration damping performance of the ceramic cutter, and extending tool life. Furthermore, fixing the ceramic cutter head to the composite material shank portion improves the toughness of the bar stock, providing better vibration damping during component machining.
[0042] Here, the material of the target shank 100 can include high-speed steel or cemented carbide. The material of the inner core 200 can include stainless steel or titanium alloy. Thus, the target shank 100, made of a material with higher hardness, allows for a greater difference in strength between the bar stock shank and the ceramic cutter head compared to ceramic and tougher metals such as stainless steel or cast iron, increasing the stability of the bar stock. This design also reduces the likelihood of chipping in the ceramic end mill during manufacturing. Furthermore, the inner core 200, made of a tougher material such as stainless steel or titanium alloy, enhances the toughness of the bar stock. This design improves the vibration damping performance of the manufactured ceramic end mill, making it less prone to chipping when machining parts.
[0043] Optional, please refer to Figure 2 and Figure 3 , Figure 2 This is a cross-sectional view of a target tool holder provided in an embodiment of this application. Figure 3 This is a cross-sectional view of an inner core provided in an embodiment of this application. The shape of the inner core 200 in the bar stock used to prepare the cutting tool matches the shape of the mounting through hole 101 of the target tool holder 100, and the outer side of the inner core 200 is fitted and fixed to the inner sidewall of the mounting through hole 101. For example, the inner core 200 and the mounting through hole 101 of the target tool holder 100 can be fastened together by interference fit, welding, or other methods. Here, the cross-sectional shape of the mounting through hole 101 of the target tool holder 100 can be circular, elliptical, or rectangular.
[0044] Please refer to the following in this application: Figure 3 and Figure 4 , Figure 4 This is a cross-sectional view of a ceramic cutter head provided in an embodiment of this application. The first end face m1 of the target cutter shank 100 and / or the second end face m2 of the inner core 200 may have a first positioning element d1, and one end face of the ceramic cutter head 300 may have a second positioning element d2 that mates with the first positioning element d1. In this case, by providing the first positioning element d1 on the first end face m1 of the target cutter shank 100 and / or the second end face m2 of the inner core 200, and providing the second positioning element d2 that mates with the first positioning element d1 on one end face of the ceramic cutter head 300, slippage due to an overly smooth welding surface is prevented, thus providing a positioning function when the ceramic cutter head 300 and the target cutter shank 100 are welded and fixed, thereby improving the yield rate of the composite ceramic rod.
[0045] Here, a first positioning element d1 is provided on the first end face m1 of the target shank 100, and a second positioning element d2 that mates with the first positioning element d1 is provided on one end face of the ceramic blade head 300. Alternatively, a first positioning element d1 is provided on the second end face m2 of the inner core 200, and a second positioning element d2 that mates with the first positioning element d1 is provided on one end face m1 of the target shank 100 and on the second end face m2 of the inner core 200, and a second positioning element d2 that mates with both first positioning elements d1 is provided on one end face of the ceramic blade head 300.
[0046] For example, one of the first positioning member d1 and the second positioning member d2 can be a recessed portion, and the other of the first positioning member d1 and the second positioning member d2 can be a protruding portion that mates with the recessed portion. For example, please refer to... Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of a first positioning element installed on the inner core. Figure 6 This is a schematic diagram of another type of second positioning element provided on the inner core. The shape of the protrusion includes, but is not limited to, hemispherical, conical, and cross-shaped, and the shape of the concave part matches the shape of the protrusion.
[0047] In the embodiments of this application, please refer to Figure 7 and Figure 8 , Figure 7 This is a cross-sectional schematic diagram of a target tool holder portion and an inner core portion provided in an embodiment of this application. Figure 8 This is a cross-sectional schematic diagram of another target tool holder portion and inner core portion provided in an embodiment of this application. The outer diameter of the target tool holder portion 100 can be D1, and the diameter of the circumscribed circle of the inner core portion 200 can be D2. Wherein, 1 / 4D1≤D2≤2 / 3D1. Here, if D2 is too small, it will easily lead to insufficient vibration damping of the bar stock; if D2 is too large, it will reduce the strength of the bar stock. Ensuring that D2 satisfies the above relationship results in higher strength of the bar stock while maintaining good vibration damping.
[0048] For example, please refer to Figure 7 The cross-section of the inner core 200 can be circular, that is, the inner core 200 can be a cylindrical structure, or, please refer to... Figure 8 The cross-section of the inner core 200 can be square, that is, the inner core 200 can be a square column structure.
[0049] Optional, please refer to Figure 7 and Figure 9 , Figure 9This is a top view of a ceramic cutter head provided in an embodiment of this application. The outer diameter of the ceramic cutter head 300 can be D3, where D3 ≥ D1 + 0.2 mm. Here, due to the eccentricity error caused by welding, the outer diameter D3 of the ceramic cutter head 300 should be at least 0.2 mm larger than the outer diameter D1 of the target shank 100. The resulting eccentricity error can be eliminated during the tool manufacturing process.
[0050] In the embodiments of this application, please refer to Figure 10 and Figure 11 , Figure 10 This is a cross-sectional view of another bar stock for preparing cutting tools provided in an embodiment of this application. Figure 11 Is adopted Figure 10 The diagram shows a cutting tool made from bar stock. The length of the target shank 100 can be L1, the length of the inner core 200 can be L2, and the length of the ceramic cutter head 300 can be L3. Wherein, L1 = L2 ≥ 2L3. Here, the length L3 of the ceramic cutter head 300 is longer than the required cutting edge length Lc of the end mill, and the lengths L1 of the target shank 100 and L2 of the inner core 200 are equal. To ensure sufficient clamping space during end mill fabrication, the above relationships must be satisfied.
[0051] It should be noted that the two oppositely arranged end faces of the target tool holder 100 can be flush with the two oppositely arranged end faces of the inner core 200.
[0052] In summary, this application provides a bar stock for manufacturing cutting tools, which may include a target shank portion 100, an inner core portion 200, and a ceramic cutting head 300. The target shank portion 100 and the inner core portion 200 constitute the shank portion of the cutting tool to be machined. The shank portion is made of a composite material composed of the target shank portion 100, which is made of a material with higher hardness, and the inner core portion 200, which is made of a material with higher toughness. When manufacturing end mills, this can avoid the cutting edge notch caused by the large difference in hardness between the shank portion and the ceramic cutting head, while improving the tool toughness, increasing the vibration damping performance of the ceramic cutting tool, and improving the tool life. In addition, fixing the ceramic cutting head 300 to the composite material shank portion improves the toughness of the bar stock and can play a better role in vibration damping when machining parts.
[0053] This application provides a cutting tool made from any of the bar stock given above. The cutting tool includes a head and a shank. The head corresponds to a ceramic head in the bar stock, and the shank corresponds to a target shank and an inner core in the bar stock.
[0054] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.
[0055] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A bar for making a cutting tool, characterized in that, include: The target is the handle, the inner core, and the ceramic blade head; The target tool holder has a mounting through hole arranged along the axial direction of the target tool holder, and one end has an annular first end face; The inner core is fixed in the mounting through hole, and the end of the inner core near the first end face has a second end face; the material of the inner core is different from the material of the target handle, the target handle is made of a metal material with high hardness relative to the inner core, and the inner core is made of a metal material with high flexibility relative to the target handle. One end face of the ceramic blade head is fitted and fixedly connected to the first end face of the target handle and the second end face of the inner core. The material of the ceramic blade head is different from the material of the target handle and the inner core.
2. Bar for making cutters according to claim 1, characterized in that, The shape of the inner core matches the shape of the mounting through hole, and the outer side of the inner core is fitted and fixed to the inner sidewall of the mounting through hole.
3. Bar for making cutters according to claim 2, characterized in that, The first end face of the target handle portion and / or the second end face of the inner core portion have a first positioning element, and one end face of the ceramic blade head has a second positioning element that cooperates with the first positioning element.
4. Bar for making cutters according to claim 3, characterized in that, One of the first positioning member and the second positioning member is a concave portion, and the other of the first positioning member and the second positioning member is a protruding portion that mates with the concave portion.
5. Bar for making cutters according to any of claims 1-4, characterized in that, The outer diameter of the target tool holder is D1, and the diameter of the circumscribed circle of the inner core is D2, wherein 1 / 4D1≤D2≤2 / 3D1.
6. Bar for making cutters according to claim 5, characterized in that, The outer diameter of the ceramic blade head is D3, where D3 ≥ D1 + 0.2 mm.
7. The bar stock for making a cutting tool according to claim 5, wherein The length of the target knife handle is L1, the length of the inner core is L2, and the length of the ceramic knife head is L3, wherein L1=L2≥2L3.
8. The bar stock for making a cutting tool according to claim 5, wherein The materials of the target tool holder include: high-speed steel and cemented carbide.
9. Bar for making cutters according to claim 8, characterized in that, The materials of the inner core include: stainless steel and titanium alloy.
10. A cutting tool characterized by The cutting tool is made from bar stock as described in any one of claims 1 to 9. The cutting tool includes a cutting head and a cutting shank, wherein the cutting head corresponds to a ceramic cutting head in the bar stock, and the cutting shank corresponds to a target cutting shank and an inner core in the bar stock.