Milling insert and milling tool
By setting an arc-shaped cutting surface on the back of the cutting head assembly of the milling insert, the problem of insufficient cutting edge strength is solved, and higher machining efficiency and better cutting accuracy are achieved.
Patent Information
- Application Number
- CN202420378312.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In aluminum milling, the rear angle of the insert needs to be sharp to avoid cracking, but this causes the blade strength to decrease, which is prone to burrs or vibrator phenomena, affecting the finish and appearance quality of the workpiece.
Design a milling insert, the back of the cutting edge surface of the cutting head assembly includes a curved cutting surface and a straight cutting surface. The curved cutting surface enhances the strength of the cutting edge and ensures that the blade is not prone to collapse under large-cut depth through specific insert structure and material selection (such as PCBN, PCD and CVD).
While ensuring the sharp edge of the blade, the strength of the edge is enhanced, the phenomenon of blade collapse is avoided, and the processing efficiency and cutting accuracy are improved.
Smart Images
Figure CN222536405U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of CNC milling processing, and in particular to a milling insert and a milling tool. Background Art
[0002] At present, in some aluminum product milling processes, whether it is face milling or shoulder milling, the blade edge strength will decrease due to the need for sharp blade back angle, especially under the dual conditions of feed processing, the blade will break. However, if the edge is not sharp, burrs or vibration will appear, resulting in a decrease in the finish and appearance quality of the workpiece. Therefore, it is urgent to solve the problem of blade edge strength under large cutting depth to achieve higher processing efficiency. Utility Model Content
[0003] The embodiments of the present application provide a milling insert and a milling tool, which can ensure the sharpness of the blade edge while also ensuring the strength of the blade edge, thereby facilitating improving processing efficiency.
[0004] According to a first aspect of an embodiment of the present application, there is provided a milling insert, comprising:
[0005] A base body is configured with a fixing hole, and a positioning groove is configured on at least one edge of the base body;
[0006] A cutter head assembly is arranged in the positioning groove, the cutter head assembly comprises a rake face and a flank face adjacent to each other, the rake face and the flank face forming a cutting edge;
[0007] Wherein, along the direction away from the cutting edge, the back cutting surface includes an arc-shaped cutting surface and a straight-line cutting surface in sequence.
[0008] In a feasible implementation, the arc-shaped blade surface is an outwardly convex arc-shaped blade surface;
[0009] The chord length of the arc-shaped blade surface is between 0.1 cm and 0.4 cm;
[0010] The radius of the arc-shaped blade surface is between 15 cm and 25 cm.
[0011] In a feasible implementation, the base is configured with two positioning grooves, and the two positioning grooves are symmetrical about the axis of the fixing hole;
[0012] The two cutter head assemblies are mounted in the two positioning grooves in a one-to-one correspondence.
[0013] In a feasible implementation, the rear tool surfaces of the two tool head assemblies are located in the same plane, and the plane is perpendicular to the axial direction of the fixing hole.
[0014] In a feasible implementation, the material of the cutter head assembly includes at least one of PCBN, PCD and CVD.
[0015] In a feasible implementation, the base structure has two positioning surfaces, the two positioning surfaces are symmetrical about the axis center of the fixing hole, and each positioning surface is located between two of the tool head assemblies.
[0016] In a feasible implementation, the positioning surface includes a first surface, a second surface and a third surface;
[0017] The first surface includes a first folding surface and a second folding surface, the second surface includes a first concave arc surface and a second concave arc surface, and the third surface is a plane, the first concave arc surface is used to connect the first folding surface and the plane, and the second concave arc surface is used to connect the second folding surface and the plane.
[0018] In a feasible implementation manner, the first folded surface is parallel to the plane;
[0019] An end of the second folding surface facing away from the first folding surface is inclined toward the fixing hole, and the inclination angle is between 10° and 30°;
[0020] The ratio of the width of the first folded surface to the thickness of the base body is between 1 / 3 and 1 / 2;
[0021] The second folding surface is communicated with the positioning groove.
[0022] According to a second aspect of an embodiment of the present application, there is provided a milling tool, comprising a milling cutter disc having a plurality of mounting positions; and
[0023] A plurality of the milling inserts described in the above embodiments are installed at the installation position by fastening screws passing through the fixing holes.
[0024] In a feasible implementation, the back angle formed by the cutter head assembly is between 6° and 8°.
[0025] The milling blade and milling tool provided in the embodiments of the present application. The part of the back face of the cutter head assembly connected to the front face is set as a curved blade face to enhance the strength of the cutting edge, thereby achieving a large feed under the same cutting depth conditions and not easy to break the edge. In addition, the use of a milling blade with a curved back face can control the thickness tolerance of the blade within the micron range, which is more conducive to controlling the cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 It is one of the structural schematic diagrams of the milling insert provided in this application;
[0028] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of AA;
[0029] Figure 3 This is the second structural schematic diagram of the milling insert provided by the present application;
[0030] Figure 4 This is the third structural schematic diagram of the milling blade (single cutter head assembly) provided by the present application;
[0031] Figure 5 It is a structural schematic diagram of the positioning surface of the milling insert provided by the present application;
[0032] Figure 6 It is a schematic diagram of the structure of the milling tool provided by the present application;
[0033] Figure 7 yes Figure 6 A partial enlarged schematic diagram;
[0034] Figure 8 It is a schematic diagram of the back angle formed by the milling tool and the milling blade provided in the present application.
[0035] Reference numerals:
[0036] 100, base body; 110, fixing hole; 120, positioning groove;
[0037] 200, cutter head assembly; 210, front cutting surface; 220, rear cutting surface; 221, arc-shaped cutting surface; 222, linear cutting surface; 130, positioning surface; 131, first surface; 1311, first folding surface; 1312, second folding surface; 132, second surface; 1321, first concave arc surface; 1322, second concave arc surface; 133, third surface;
[0038] 300. Milling cutter disc. DETAILED DESCRIPTION
[0039] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.
[0040] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0041] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0042] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0044] Since the back cutting edge of the super-hard indexable milling inserts on the market is usually in a straight line shape, the back angle becomes sharp, which makes it easy for the cutting edge to break during the cutting process.
[0045] Figure 1 It is one of the structural schematic diagrams of the milling insert provided in this application; Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of AA; Figure 3 This is the second structural schematic diagram of the milling insert provided by the present application; Figure 4 This is the third structural schematic diagram of the milling blade (single cutter head assembly) provided in this application.
[0046] To improve the blade edge strength, Figures 1 to 4 As shown, the present application provides a milling insert, which may include a base body 100 and a tool head assembly 200 .
[0047] The base 100 is configured with a fixing hole 110, and a positioning groove 120 is configured on at least one edge of the base 100; the cutter head assembly 200 is arranged in the positioning groove 120, and the cutter head assembly 200 includes adjacent front cutting surface 210 and rear cutting surface 220, and the front cutting surface 210 and the rear cutting surface 220 form a cutting edge; wherein, along the direction away from the cutting edge, the rear cutting surface 220 includes an arc-shaped cutting surface 221 and a straight-line cutting surface 222 in sequence.
[0048] It can be understood that the structure of the base 100 in this example is in the shape of a long strip. For the convenience of description, the base 100 can be defined as having a long side, a wide side and a thick side, and the length of the long side, the length of the wide side and the length of the thick side are successively reduced. A fixing hole 110 is constructed on the plane formed by the long side and the wide side. The fixing hole 110 is set through the base 100, that is, the length of the fixing hole 110 is consistent with the length of the rear side. The setting of the fixing hole 110 is mainly used to install the base 100 on the milling tool described below.
[0049] A positioning groove 120 may be constructed on the long side edge of the base 100, or it may be understood that a notch is constructed on the long side of the base 100. The positioning groove 120 or the notch is used to install the cutter head assembly 200. The cutter head assembly 200 is formed with a cutting edge to cut the workpiece. The cutter head assembly 200 and the base 100 may be installed by welding or bonding, etc., which is not limited here.
[0050] The structure of the cutter head assembly 200 can also be set to be a long strip, the long side of the cutter head assembly 200 is consistent with the long side of the substrate 100, the front cutting surface 210 of the cutter head assembly 200 is consistent with (coincides with) the plane formed by the long side and the thick side of the substrate 100, and the back cutting surface 220 of the cutter head assembly 200 is consistent with (coincides with) the plane formed by the long side and the wide side of the substrate 100. In order to ensure the sharpness of the cutter head assembly 200 and avoid or reduce the occurrence of chipping, the present application sets the part of the back cutting surface 220 connected to the front cutting surface 210 as a curved cutting surface 221. In other words, on the back cutting surface 220, along the direction away from the cutting edge, the back cutting surface 220 includes a curved cutting surface 221 and a straight cutting surface 222 in sequence, that is, the curved cutting surface 221 is located between the cutting edge and the straight cutting surface 222 to enhance the strength of the cutting edge.
[0051] In the present application, the portion of the rake face 210 connected to the flank face 220 of the cutter head assembly 200 is set as a curved blade face 221 to enhance the strength of the cutting edge, thereby achieving a large feed under the same cutting depth conditions and not prone to chipping. In addition, the use of a milling blade with a curved flank face 220 can control the thickness tolerance of the blade within the micron range, which is more conducive to controlling the cutting accuracy.
[0052] Next, we will combine the attached Figure 1-5 The specific structure of the milling insert provided in the embodiment of the present application is described in detail.
[0053] like Figure 2 As shown, in some embodiments, the arc blade surface 221 is an outwardly convex arc blade surface 221; the chord length of the arc blade surface 221 is between 0.1 cm and 0.4 cm; and the radius of the arc blade surface 221 is between 15 cm and 25 cm.
[0054] Specifically, the cross section of the arc blade 221 is an outward convex arc, and the chord length L of the arc blade 221 (i.e., the shortest distance from the cutting edge to the straight blade 222) is between 0.1 cm and 0.4 cm. For example, the chord length L can be 0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, etc., without limitation. The radius of the arc blade 221 can represent the curvature of the arc blade 221. The greater the curvature, the greater the degree of curvature, which makes it easy to interfere with the surface of the workpiece during cutting. The smaller the curvature, the smaller the degree of curvature, which makes it easy to approach the straight blade 222, and has no substantial effect on enhancing the edge strength. Based on this, the radius R of the arc blade 221 can be 15 cm, 22 cm, 25 cm, etc., without limitation.
[0055] like Figure 1 , Figure 3As shown, in some embodiments, the base 100 is configured with two positioning grooves 120 , and the two positioning grooves 120 are symmetrical about the axis of the fixing hole 110 ; the two tool head assemblies 200 are installed in the two positioning grooves 120 in a one-to-one correspondence.
[0056] It is understandable that the design of the double cutter head of the milling insert can improve the economical use of the milling insert. The two positioning grooves 120 can be set in the same plane formed by the long side and the wide side of the base 100, but are symmetrically arranged about the axis center of the fixing hole 110, that is, the two cutter head assemblies 200 installed in the positioning grooves 120 are symmetrically arranged about the axis center of the fixing hole 110, so that after one cutter head assembly 200 fails, the base can be rotated 180° to replace it with another cutter head assembly 200.
[0057] like Figure 3 As shown, in some embodiments, the back cutting surfaces 220 of the two tool head assemblies 200 are located in the same plane, and the plane is perpendicular to the axial direction of the fixing hole 110 .
[0058] Specifically, the plane where the back cutting surfaces 220 of the two cutter head assemblies 200 are located is the same plane as the plane of the construction fixing hole 110 (i.e., the plane formed by the long side and the wide side of the base 100). Then, the front cutting surfaces 210 of the two cutter head assemblies 200 are opposite to each other with respect to the fixing hole 110, that is, the front cutting surfaces 210 are located in the plane formed by the long side and the thick side of the base 100. However, the cutting edges (including the main cutting edge, the secondary cutting edge, and the transition connection cutting edge) of the two cutter head assemblies 200 are symmetrical about the axis center of the positioning hole. This arrangement can facilitate the replacement of the cutter head assembly 200 and can improve the economic efficiency of the use of the milling blade.
[0059] In some embodiments, the material of the tool head assembly 200 includes at least one of PCBN, PCD and CVD.
[0060] It is understandable that PCBN is polycrystalline cubic boron nitride (PCBN), whose hardness is second only to natural diamond. The cutter head assembly 200 made of this material and the arc-shaped blade surface 221 design of the back blade 220 can further enhance the strength of the cutting edge, thereby solving the problem of blade edge strength under large cutting depth and achieving higher processing efficiency. Of course, the material of the cutter head assembly 200 is not limited to the above materials.
[0061] Figure 5 Schematic diagram of the structure of the positioning surface of the milling insert provided by the present application, such as Figure 4 and Figure 5As shown, in some embodiments, the base body 100 is configured with two positioning surfaces 130 , the two positioning surfaces 130 are symmetrical about the axis of the fixing hole 110 , and each positioning surface 130 is located between two tool head assemblies 200 .
[0062] It can be understood that the two positioning surfaces 130 are located on the surface where the smallest surface of the elongated cutter head assembly 200 is located, that is, the surface formed by the wide side and the thick side of the base 100, and the two positioning surfaces 130 are symmetrical about the axis center of the fixing hole 110, and are separated from the back cutting surface 220 of the cutter head assembly 200, and will not cause interference.
[0063] The specific structure of the positioning surface 130 is as follows: Figure 5 As shown, in some embodiments, the positioning surface 130 includes a first surface 131, a second surface 132 and a third surface 133; the first surface 131 includes a first folding surface 1311 and a second folding surface 1312, the second surface 132 includes a first concave arc surface 1321 and a second concave arc surface 1322, and the third surface 133 is a plane, the first concave arc surface 1321 is used to connect the first folding surface 1311 and the plane, and the second concave arc surface 1322 is used to connect the second folding surface 1312 and the plane.
[0064] Specifically, the first folded surface 1311 is the contour side of the base 100, the second folded surface 1312 is connected to the first folded surface 1311 and is inclined toward the direction close to the fixing hole 110, the first concave arc surface 1321 and the second concave arc surface 1322 are located between the first surface 131 and the third surface 133, and the first concave arc surface 1321 and the second concave arc surface 1322 serve as a circular arc transition between the first surface 131 and the second surface 132, which is convenient for adapting to the positioning screws in the milling cutter disc 300 described below.
[0065] Of course, the second folding surface 1312 is inclined toward the inside of the base 100 relative to the first folding surface 1311, which is also convenient for the base 100 to match and clamp with the positioning screws in the milling cutter disc 300 described below. Of course, the inclination angle of the second folding surface 1312 can be determined according to the model of the positioning screws, and is not limited here.
[0066] like Figure 5 As shown, in some embodiments, the first fold surface 1311 is parallel to the plane; the end of the second fold surface 1312 away from the first fold surface 1311 is inclined toward the direction close to the fixing hole 110, and the inclination angle is between 10°-30°; the ratio of the width of the first fold surface 1311 to the thickness of the base 100 is between 1 / 3-1 / 2; the second fold surface 1312 is connected to the positioning groove 120.
[0067] Specifically, the first folded surface 1311 and the third surface 133 are both contour side surfaces of the base 100, but the distances between the two and the fixing hole 110 are different. The first folded surface 1311 and the third surface 133 are connected by a first concave arc surface 1321, and the second folded surface 1312 and the third surface 133 are connected by a second concave arc surface 1322. The second folded surface 1312 is inclined toward the inside of the base 100, and the inclination angle α can be 10°, 15°, 20°, 30°, etc. The inclination angle also needs to be determined according to the model of the positioning screw when the milling blade is installed with the milling tool described below, and is not limited here.
[0068] In addition, the ratio of the width D (the length along the thick side direction of the substrate 100 ) of the first folded surface 1311 to the thickness of the substrate 100 may be 1 / 3 or 1 / 2, which is not limited here.
[0069] Of course, the positioning surface 130 also has a notch, and the notch is used to form the positioning groove 120 to facilitate the installation of the cutter head assembly 200.
[0070] The positioning surface 130 provided in the example of the present application has a long-term positioning reference, which can allow the milling insert to be re-read and re-grinded, further improving the economic efficiency of the use of the milling insert.
[0071] Figure 6 It is a schematic diagram of the structure of the milling tool provided by the present application; Figure 7 yes Figure 6 A partial enlarged schematic diagram; Figure 8 It is a schematic diagram of the back angle formed by the milling tool and the milling blade provided in the present application.
[0072] The present application also provides a milling tool, such as Figures 6 to 8 As shown, a milling cutter disc 300 and a plurality of milling inserts in the above-mentioned embodiments may be included. The milling insert is configured with a plurality of mounting positions, and the plurality of milling inserts are mounted on the mounting positions by fastening screws passing through the fixing holes 110 .
[0073] It is understandable that the way in which the milling blade is installed on the milling cutter disc 300 can be understood by referring to the relevant technology, and will not be described in detail here. Since the back face 220 of the milling blade provided in this example is arc-shaped, the thickness tolerance of the blade can be controlled within the range of microns (for example, several microns), and the radial size consistency after being installed on the milling cutter disc 300 is high, so that the radial cutting force of the blade is uniform, thereby achieving the purpose of increasing the stability of the tool.
[0074] like Figure 8 As shown, in some embodiments, the relief angle β formed by the tool head assembly 200 is between 6° and 8°.
[0075] It is understandable that in order to avoid interference between the arc-shaped back cutting surface 220 on the milling blade and the workpiece after the milling blade is installed on the milling cutter disc 300, it is necessary to ensure that the milling blade will still form a back angle β between 6°-8° after being installed on the milling cutter disc 300, for example 7°, but there is no limit.
[0076] Finally, it should be noted that the above implementation modes are only used to illustrate the present application, rather than to limit the present application. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should be included in the scope of the claims of the present application.
Claims
1. A milling insert, characterized in that: include: A base body is configured with a fixing hole, and a positioning groove is configured on at least one edge of the base body; A cutter head assembly is arranged in the positioning groove, the cutter head assembly comprises a rake face and a flank face adjacent to each other, the rake face and the flank face forming a cutting edge; Wherein, along the direction away from the cutting edge, the back cutting surface includes an arc-shaped cutting surface and a straight-line cutting surface in sequence.
2. The milling insert according to claim 1, characterized in that The arc-shaped blade surface is an outwardly convex arc-shaped blade surface; The chord length of the arc-shaped blade surface is between 0.1 cm and 0.4 cm; The radius of the arc-shaped blade surface is between 15 cm and 25 cm.
3. The milling insert according to claim 2, characterized in that The base body is configured with two positioning grooves, and the two positioning grooves are symmetrical about the axis of the fixing hole; The two cutter head assemblies are mounted in the two positioning grooves in a one-to-one correspondence.
4. The milling insert according to claim 3, characterized in that The rear tool surfaces of the two tool head assemblies are located in the same plane, and the plane is perpendicular to the axial direction of the fixing hole.
5. The milling insert according to claim 4, characterized in that The material of the cutter head assembly includes at least one of PCBN, PCD and CVD.
6. The milling insert according to any one of claims 3 to 5, characterized in that The base body is configured with two positioning surfaces, the two positioning surfaces are symmetrical about the axis center of the fixing hole, and each positioning surface is located between two of the tool head assemblies.
7. The milling insert according to claim 6, characterized in that The positioning surface includes a first surface, a second surface and a third surface; The first surface includes a first folding surface and a second folding surface, the second surface includes a first concave arc surface and a second concave arc surface, and the third surface is a plane, the first concave arc surface is used to connect the first folding surface and the plane, and the second concave arc surface is used to connect the second folding surface and the plane.
8. The milling insert according to claim 7, characterized in that The first folded surface is parallel to the plane; An end of the second folding surface facing away from the first folding surface is inclined toward the fixing hole, and the inclination angle is between 10° and 30°; The ratio of the width of the first folded surface to the thickness of the base body is between 1 / 3 and 1 / 2; The second folding surface is communicated with the positioning groove.
9. A milling tool, characterized in that: A milling cutter head is provided with a plurality of mounting positions; and A plurality of milling inserts as described in any one of claims 1 to 8, wherein the plurality of milling inserts are installed at the installation position by fastening screws passing through the fixing holes.
10. The milling tool according to claim 9, characterized in that The back angle formed by the cutter head assembly is between 6° and 8°.