Fast feed milling cutter
By designing a fast feed milling cutter with arc-shaped cutting edge, the rapid wear problem caused by low feeding of existing milling hole cutters is solved, and longer tool life and higher cutting efficiency are achieved.
Patent Information
- Application Number
- CN202420324602.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-02-21
AI Technical Summary
The feeding of the teeth of the existing milling hole cutter is not high. In order to improve efficiency, high linear speed processing is used, which leads to rapid wear of the end edge of the milling cutter and short service life.
A fast feed milling cutter is designed, including a grip section, a connecting section and a milling hole section. The milling hole section has an arc-shaped cutting edge, which is improved by the cutting edge formed by the three arcs of Ra, Rb and Rc. Tool strength and wear resistance.
Through the design of arc cutting edges, the cutting edge per unit length can bear less cutting force and longer tool life, or at the same life, processing parameters can be improved and cutting efficiency can be achieved.
Smart Images
Figure CN222429384U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cutting tools, in particular to a fast-feed milling cutter. Background Art
[0002] End mill is a cutting tool used to machine holes in workpieces. It is usually used for metal processing on milling machines and can be used to machine holes of various shapes and sizes.
[0003] In the processing of micro-small molds, solid alloy milling cutters are used to process the surface or cavity. Often only the end edge of the milling cutter is used for processing. Due to the design characteristics and limitations of the end edge of the standard milling cutter, the tooth feed rate is not high, but in order to improve efficiency, high linear speed processing is often adopted, which causes the end edge of the milling cutter to wear quickly, thereby shortening the service life of the milling cutter. Utility Model Content
[0004] The utility model provides a fast-feed milling cutter, which is used to solve the technical problem that the existing milling cutters have low tooth feed rate, but adopt high linear speed processing to improve efficiency, which leads to rapid wear of the end edge of the milling cutter and shortens the service life of the milling cutter.
[0005] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a fast-feed milling cutter includes a holding section, a connecting section and a milling section. The holding section is used to be installed on a milling device. One side of the connecting section is coaxially installed on the holding section. The milling section is coaxially installed on the side of the connecting section away from the holding section, and the milling section has a first cutting edge, a second cutting edge and a third cutting edge in the shape of an arc. The milling device rotates to drive the holding section to rotate, and the milling section is brought into contact with a part to open a blind hole on the part.
[0006] When a fast-feed milling cutter provided by the utility model is used, the holding section is first installed on the milling device, so that the milling device rotates to drive the holding section to rotate, and then the connecting section and the milling section rotate, and at the same time, one end of the milling section away from the connecting section is abutted against a part, thereby drilling a hole in the part.
[0007] Optionally, the first cutting edge radius R a , the second cutting edge radius R b And the third cutting edge radius R c The cross-sectional dimension D of the milling hole section satisfies 0.067D≤R a ≤0.084D, 1.3D≤R b ≤1.35D, 0.04D≤R c ≤0.06D.
[0008] Optionally, the cutting edge of the hole milling section has a side clearance angle α1, a center recess angle α2 and α3, wherein 4°≤α1≤6°, 9°≤α2=α3≤11°.
[0009] Optionally, the length L1 of the milling hole segment in the axial direction thereof and the cross-sectional dimension D of the milling hole segment satisfy 0.98D≤L1≤1.02D.
[0010] Optionally, the dimension dh of the cross section of the connecting section satisfies 0.96D≤dh≤0.98D, and the length L of the connecting section in the axial direction thereof is n The cross-sectional dimension D of the milling hole section satisfies 0.48D≤L n ≤0.52D.
[0011] Optionally, the cutting depth H of the cutting edge of the hole milling section satisfies, H≤0.07D.
[0012] Optionally, the cutting edge core thickness h of the hole milling section satisfies 0.6D≤h≤0.7D.
[0013] Optionally, the cutting edge of the milling section has a circumferential tooth rake angle β1 and a back angle β2, which satisfy 5°≤β1≤7°, 9°≤β2≤11°, and the back tool face width d of the cutting edge satisfies 0.12D≤d≤0.16D.
[0014] It can be seen from the above technical scheme that the beneficial effect of a fast-feed milling cutter provided by the utility model is that the cutting edge formed by the three arc sections of Ra, Rb and Rc is stronger than the straight cutting edge. Since the three arc-shaped cutting edge has a longer contact length with the workpiece, under the same cutting parameters, due to the longer contact surface, the cutting force per unit length of the cutting edge is smaller. Lower cutting force leads to a longer tool life, or at the same life, the processing parameters can be improved to obtain higher cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 A schematic structural diagram of a fast feed milling cutter provided in an embodiment of the utility model;
[0017] Figure 2 for Figure 1 The cross-sectional view obtained after cutting along the AA path;
[0018] Figure 3 for Figure 2 An enlarged schematic diagram of the circled portion;
[0019] Figure 4 for Figure 1 A schematic diagram of the structure along the direction indicated by arrow B;
[0020] Figure 5 for Figure 4 A cross-sectional view of
[0021] Figure 6 for Figure 5 An enlarged schematic diagram of the circled portion.
[0022] In the figure: 1-holding section; 2-connecting section; 3-milling section. DETAILED DESCRIPTION
[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 should not be understood as a limitation on the present application.
[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] Example
[0028] In the processing of micro-small molds, solid alloy milling cutters are used to process the surface or cavity. Often only the end edge of the milling cutter is used for processing. Due to the design characteristics and limitations of the end edge of the standard milling cutter, the tooth feed rate is not high, but in order to improve efficiency, high linear speed processing is often adopted, which causes the end edge of the milling cutter to wear quickly, thereby shortening the service life of the milling cutter.
[0029] In order to solve the above technical problems, refer to Figure 1 and Figure 2 As shown, this embodiment provides a fast feed milling cutter including a holding section 1, a connecting section 2 and a milling hole section 3. The holding section 1 is used to be installed on a milling hole device. One side of the connecting section 2 is coaxially mounted on the holding section 1. The milling hole section 3 is coaxially mounted on the side of the connecting section 2 away from the holding section 1, and the milling hole section 3 has a first cutting edge, a second cutting edge and a third cutting edge in the shape of an arc. The milling hole device rotates to drive the holding section 1 to rotate, and makes the milling hole section 3 abut against the part to open a blind hole on the part. The holding section 1, the discharge section 2 and the milling hole section 3 can be integrally formed using high-speed steel or cemented carbide. High-speed steel is a commonly used milling cutter material with high hardness and wear resistance. It is usually made of steel with alloy elements such as tungsten, molybdenum, and cobalt added, and can maintain good hardness and cutting performance at high temperatures. Cemented carbide milling cutters are made of metal carbide powder.
[0030] Through the above structure, the fast feed milling cutter provided in this embodiment first installs the holding section 1 on the milling device, so that the milling device rotates to drive the holding section 1 to rotate, and then the connecting section 2 and the milling section 3 rotate, and at the same time, the end of the milling section 3 away from the connecting section 2 is abutted against the part, and then the part is opened. The cutting edge formed by the three arcs of Ra, Rb and Rc is stronger than the straight cutting edge. Since the three arc cutting edges have a longer contact length with the workpiece, under the same cutting parameters, due to the longer contact surface, the cutting force per unit length of the cutting edge is smaller and lower cutting force, and the tool life is longer, or at the same life, the processing parameters can be improved to obtain higher cutting efficiency, thereby solving the technical problem that the existing milling cutter has a low tooth feed rate, but uses high linear speed processing to improve efficiency, which leads to rapid wear of the end edge of the milling cutter, resulting in a short service life of the milling cutter.
[0031] On the basis of the above, in order to facilitate the processing of arc-shaped cutting edges, refer to Figure 3 As shown, the first cutting edge radius R a , the second cutting edge radius R b And the third cutting edge radius R c The cross-sectional dimension D of the milling hole section 3 satisfies 0.067D≤R a ≤0.084D, 1.3D≤R b ≤1.35D, 0.04D≤Rc ≤0.06D. The cross-sectional dimension D of the milling hole section 3 can be 12 mm, and the optimized tool tip radius (radius R a ) can match different diameters, increase the strength of the tool tip, reduce wear, and reduce cutting force. The cutting edge of the arc segment (radius R b ) is stronger and more wear-resistant than the straight line segment, and the arc transition (radius R c ) is stronger and less prone to wear than sharp points, so arc transition has better strength, smaller contact surface and lower cutting force than straight line transition.
[0032] On the basis of the above, in order to facilitate the further processing of the arc cutting edge, refer to Figure 3 As shown, the cutting edge of the milling hole section 3 has a side clearance angle α1, a center concave angle α2 and α3, wherein 4°≤α1≤6°, 9°≤α2=α3≤11°. α1 can be 5°, and the values of α2 and α3 can both be 10°. A larger side clearance angle (α1) can reduce the side edge contact and reduce the cutting resistance. The center concave angles (α2 and α3) can reduce the end edge contact length and significantly reduce the cutting resistance.
[0033] On the basis of the above, refer to Figure 1 As shown, the length L1 of the milling hole section 3 in the axial direction and the cross-sectional dimension D of the milling hole section 3 satisfy 0.98D≤L1≤1.02D. The value of L1 can be 12mm, the cross-sectional dimension dh of the connecting section 2 satisfies 0.96D≤dh≤0.98D, and the length L of the connecting section 2 in the axial direction n The cross-sectional dimension D of the milling hole section 3 satisfies 0.48D≤L n ≤0.52D, where dh can be 11.5mm, L n The value of can be 6mm, and the overall length L of the fast feed milling cutter satisfies, 6.2D≤L≤6.5D, so the value of the overall length L of the fast feed milling cutter can be 75mm, and the cross-sectional dimension SD of the holding section 1 can be 12mm.
[0034] On the basis of the above, refer to Figure 3 As shown, the cutting depth H of the cutting edge of the milling hole section 3 satisfies H≤0.07D, so the maximum cutting depth of a fast feed milling cutter of the present application is 0.07D.
[0035] On the basis of the above, refer to Figure 4 and Figure 5 and Figure 6As shown, the cutting edge core thickness h of the milling hole section 3 satisfies 0.6D≤h≤0.7D. The cutting edge of the milling hole section 3 has a circumferential tooth rake angle β1 and a back angle β2, which satisfy 5°≤β1≤7°, 9°≤β2≤11°, and the back tool face width d of the cutting edge satisfies 0.12D≤d≤0.16D. The value of β1 can be 6°, and the value of β2 can be 10°.
[0036] In summary, in the use of a fast-feed milling cutter, first, the holding section 1 is installed on the milling device, so that the milling device rotates to drive the holding section 1 to rotate, and then the connecting section 2 and the milling section 3 rotate, and at the same time, the end of the milling section 3 away from the connecting section 2 is abutted against the part, and then the part is opened. The cutting edge formed by the three arcs of Ra, Rb and Rc is stronger than the straight cutting edge. Since the three arc cutting edges have a longer contact length with the workpiece, under the same cutting parameters, due to the longer contact surface, the cutting force per unit length of the cutting edge is smaller. The lower the cutting force, the longer the tool life, or at the same life, the processing parameters can be improved to obtain higher cutting efficiency, thereby solving the technical problem that the existing milling cutter has a low tooth feed rate, but uses high linear speed processing to improve efficiency, which causes the end edge of the milling cutter to wear quickly, resulting in a short service life of the milling cutter.
[0037] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope recorded in the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A fast feed milling cutter, characterized in that: include: A gripping section (1) for mounting on a milling device; A connecting section (2), one side of which is coaxially mounted on the holding section (1); A milling hole section (3) is coaxially mounted on a side of the connecting section (2) away from the holding section (1), and the milling hole section (3) has a first cutting edge, a second cutting edge and a third cutting edge in the shape of an arc; The milling device rotates to drive the holding section (1) to rotate, and enables the milling section (3) to abut against the part to open a blind hole on the part.
2. A fast feed milling cutter according to claim 1, characterized in that: The first cutting edge radius R a , the second cutting edge radius R b And the third cutting edge radius R c The cross-sectional dimension D of the milling hole section (3) satisfies: 0.067D≤R a ≤0.084D, 1.3D≤R b ≤1.35D, 0.04D≤R c ≤0.06D.
3. A fast feed milling cutter according to claim 2, characterized in that: The cutting edge of the hole milling section (3) has a side clearance angle α1, a center recess angle α2 and α3, wherein 4°≤α1≤6°, 9°≤α2=α3≤11°.
4. A fast feed milling cutter according to claim 3, characterized in that: The length L1 of the milling hole section (3) in the axial direction thereof and the cross-sectional dimension D of the milling hole section (3) satisfy the following relationship: 0.98D≤L1≤1.02D.
5. A fast feed milling cutter according to claim 4, characterized in that: The dimension dh of the cross section of the connecting section (2) satisfies 0.96D≤dh≤0.98D, and the length L of the connecting section (2) in the axial direction thereof is n The cross-sectional dimension D of the milling hole section (3) satisfies: 0.48D≤L n ≤0.52D.
6. A fast feed milling cutter according to claim 5, characterized in that: The cutting depth H of the cutting edge of the hole milling section (3) satisfies H≤0.07D.
7. A fast feed milling cutter according to claim 6, characterized in that: The cutting edge core thickness h of the hole milling section (3) satisfies 0.6D≤h≤0.7D.
8. A fast feed milling cutter according to claim 7, characterized in that: The cutting edge of the milling hole section (3) has a circumferential tooth front angle β1 and a back angle β2, which satisfy 5°≤β1≤7°, 9°≤β2≤11°, and the back tool width d of the cutting edge satisfies 0.12D≤d≤0.16D.