Vertical fast-feed milling cutter blade and cutter head

Abstract

The invention discloses a vertical fast-feed milling blade which comprises a blade body, the blade body comprises a first end face, a second end face and a radial positioning face, and the radial positioning face is connected with the first end face and the second end face. One end of the blade main body is a working end, the other end of the blade main body is a non-working end, the working end comprises a main cutting edge, an auxiliary cutting edge and a rake face, and the main cutting edge and the auxiliary cutting edge are in transition connection through an arc edge; the main cutting edge extends to the side edge of the front tool face through the main cutting edge tool nose fillet. The auxiliary cutting edge extends to the intersection line of the radial positioning face and the first end face through the auxiliary cutting edge tool nose fillet. And a screw hole is formed in the center of the radial positioning surface. The vertical milling blade is more stable in installation, and the overall rigidity and the machining efficiency of the blade are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of milling tools, and in particular relates to a vertically mounted fast-feed milling cutter blade and a cutter disc. Background Art

[0002] With the increasing requirements for machining accuracy and efficiency of complex parts in the fields of aerospace, automobile manufacturing, etc., traditional milling technology can hardly meet the needs of high-speed and large feed processing. The current industry widely adopts the flat screw fastening solution, that is, the milling blade is directly pressed into the cutter body slot by the top screw, although it has the advantages of simple structure and convenient tool change. However, during the cutting process of the flat milling blade, the radial force and tangential force borne by the blade will be directly transmitted to the fastening screw, causing the screw thread to be subjected to periodic shear stress, which is easy to cause loosening or even breakage. The loosening of the screw will cause the blade to micro-displace, resulting in increased cutting vibration and affecting the machining quality of the workpiece. Traditional flat tools are difficult to achieve efficient processing under large cutting depths and large feed parameters.

[0003] Commonly used vertical shoulder milling, because the screw is fastened in the radial direction, there is a certain limit on the thickness of the blade. A too thick blade requires a longer screw to tighten, but too long a screw will cause its strength to decrease. Taking M5 screws as an example, the applicable length of the screw is generally in the range of 4.5 to 10.5 mm. When the external thread of the screw is tightened with the internal thread of the cutter body, at least 3 turns of pitch depth are required to have the required strength. The standard pitch of M5 screws is 0.8 mm, and the thickness of the blade is limited to less than 10.5-0.8*3=8.1 mm. Since the main cutting edge of the fast feed is arranged in the radial direction at a certain angle, the effective cutting depth must be greater than 1 mm in actual processing. In addition, the minimum diameter of the commonly used cutter disc is generally 50 mm. At this time, the blade must be installed on the cutter body with a certain thickness of support, and the screw hole on the cutter body must not penetrate the mandrel mounting hole. Therefore, it becomes particularly difficult to design the main cutting edge in the radial layout. In addition, if the cutting edge is arranged in the radial direction, the 0-degree back angle cannot achieve the indexability of the blade.

[0004] The existing patent publication number CN117680727A discloses a cutting blade and a cutting tool, wherein the cutting blade includes: an upper end face and a lower end face; a width side face and a length side face extending between the upper end face and the lower end face; a first mounting hole, which is arranged through the middle of the upper end face and the lower end face; the middle part of the length side face is recessed to form a second groove surface; a third groove surface is arranged at the end of the length side face; the length side face also includes a side plane arranged between the second groove surface and the third groove surface. The mounting hole of the patent is arranged between the upper end face and the lower end face. During the processing, the blade is subjected to the cutting force, and the mounting screws are easy to loosen, thereby causing the blade to be slightly displaced, affecting the processing quality of the workpiece; the groove design has a certain impact on the overall structural strength of the blade, especially in the case of high cutting force and vibration, which may affect the durability and service life of the tool. Summary of the invention

[0005] The present invention is mainly aimed at the problem that during the cutting process of the flat-mounted milling blade in the prior art, the radial force and tangential force borne by the blade will be directly transmitted to the fastening screw, causing the screw thread to bear periodic shear stress, which can easily cause the screw to loosen or even break. The loose screw will cause the blade to micro-displace, resulting in aggravated cutting vibration and affecting the processing quality of the blade. The traditional flat-mounted tool is difficult to achieve efficient processing under large cutting depth and large feed parameters. A vertically mounted fast-feed milling blade and cutter disc are proposed.

[0006] A vertically mounted fast-feed milling cutter blade comprises a cutter body, the cutter body comprises a first end face, a second end face and a radial positioning face, the radial positioning face is respectively connected to the first end face and the second end face; one end of the cutter body is a working end, and the other end is a non-working end, the working end comprises a main cutting edge, a secondary cutting edge and a front cutting face, the main cutting edge and the secondary cutting edge are connected via a circular arc edge transition; the main cutting edge extends to the side of the front cutting face via the radius of the main cutting edge tip; the secondary cutting edge extends to the intersection line of the radial positioning face and the first end face via the radius of the secondary cutting edge tip; a screw hole is provided at the center of the radial positioning face.

[0007] Furthermore, the main cutting edge tip radius, the main cutting edge, the arc edge, the secondary cutting edge and the secondary cutting edge tip radius are connected in sequence.

[0008] Furthermore, the rake surface is a double inclined surface, the rake surface comprises a first rake surface and a second rake surface, and both the first rake surface and the second rake surface are inclined along the inside of the blade body.

[0009] Furthermore, it also includes a first rake angle and a second rake angle, wherein the first rake angle is 15° and the second rake angle is 25°.

[0010] Furthermore, it also includes a margin, and the width of the margin is 0.1 mm.

[0011] Furthermore, it also includes a main cutting edge flank, a secondary cutting edge flank and a cutting plane, wherein the main cutting edge flank is connected to the secondary cutting edge flank by an arc surface, and the main cutting edge flank is inclined in opposite directions to the secondary cutting edge flank. The cutting plane is a plane passing through the main cutting edge and along the cutting speed direction.

[0012] Furthermore, a main cutting edge clearance angle is formed between the main cutting edge clearance surface and the cutting plane, and the main cutting edge clearance angle is -7°.

[0013] Furthermore, a secondary cutting edge clearance angle is formed between the secondary cutting edge clearance surface and the cutting plane, and the secondary cutting edge clearance angle is 7°.

[0014] Furthermore, the effective cutting depth of the blade body is 1.8 mm.

[0015] A cutter disc, used in conjunction with the vertically mounted fast-feed milling blade as claimed in any one of claims 1 to 9, wherein the radial angle and axial angle of the cutter disc installation are 17° and 5° respectively; the milling blade is vertically embedded in the cutter disc so that the cutting force is distributed along the positioning surface direction.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention includes a blade body, which includes a first end face, a second end face, and a radial positioning surface. One end of the blade body is a working end, and the other end is a non-working end. The working end includes a main cutting edge, a secondary cutting edge, and a front cutting face. The main cutting edge and the secondary cutting edge are connected by a circular arc edge transition; the main cutting edge extends to the side of the front cutting face through the main cutting edge tip fillet; the secondary cutting edge extends to the intersection of the radial positioning surface and the first end face through the secondary cutting edge tip fillet; a screw hole is provided at the center of the radial positioning surface. The present invention sets the screw positioning hole on the radial positioning surface of the blade body, and vertically installs it on the cutter disc. The blade body is perpendicular to the cutter disc, the main cutting edge back cutting face serves as a clearance surface, and the secondary cutting edge serves as an axial positioning surface, which increases the radial positioning accuracy and rigidity of the tool and reduces vibration and runout during processing; at the same time, the blade body forms a double constraint through the axial positioning surface and the radial positioning surface, which can avoid the axial displacement of the blade when the cutting force is applied, and improve the stability of processing.

[0018] 2. The main cutting edge and the secondary cutting edge on the blade body are connected by a circular arc edge transition and extend to the radius of the main cutting edge tip and the radius of the secondary cutting edge tip respectively, reducing the risk of stress concentration and chipping, while reducing the impact of cutting heat on the cutting edge.

[0019] 3. The blade body is vertically mounted on the cutter disc, and the effective cutting depth of the blade reaches 1.8mm, which shortens the tool overhang length, enhances the overall rigidity and stability, and achieves large cutting depth, high feed and stable cutting; at the same time, it allows the use of higher cutting parameters (such as feed speed, cutting depth), which improves the processing efficiency of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a vertically mounted fast-feed milling cutter;

[0021] Figure 2 A top view of a vertically mounted fast-feed milling cutter;

[0022] Figure 3 It is a side view of a vertically mounted fast feed milling cutter;

[0023] Figure 4 A-A section view of a vertically mounted fast feed milling cutter Figure 1 ;

[0024] Figure 5 A-A section view of a vertically mounted fast feed milling cutter Figure 2 ;

[0025] Figure 6 A schematic diagram of a radial angle and an axial angle of a cutter head installation;

[0026] Figure 7 It is a schematic diagram of the axial clearance angle of the tail of the blade after the present invention is installed in cooperation with the cutter disc;

[0027] Figure 8 It is a schematic diagram of the main rake angle and the effective cutting depth of the present invention.

[0028] In the above figure, 1. main cutting edge; 2. secondary cutting edge; 3. arc edge; 4. first end face; 5. second end face; 6. radial positioning surface; 7. arc surface; 8. first rake face; 9. second rake face; 10. main cutting edge tip radius; 11. secondary cutting edge tip radius; 12. main cutting edge flank face; 13. secondary cutting edge flank face; 14. screw hole; 15. margin; 16. cutter disc; α. first rake angle; β. second rake angle; γ. radial angle; δ. axial angle; Φ1. main deflection angle; Φ2. tail axial clearance angle; θ. main cutting edge flank angle; L1. effective cutting depth; L2. margin width. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of the solution of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0031] In addition, in the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" 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 present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, reference terms; "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like are intended to mean 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0034] Example 1

[0035] like Figures 1 to 3As shown, a vertically mounted fast-feed milling cutter comprises a cutter body, wherein the cutter body comprises a first end face 4, a second end face 5, and a radial positioning face 6, wherein the radial positioning face 6 is respectively connected to the first end face 4 and the second end face 5; one end of the cutter body is a working end, and the other end is a non-working end, wherein the working end comprises a main cutting edge 1, a secondary cutting edge 2, and a front cutting face, wherein the main cutting edge 1 and the secondary cutting edge 2 are transitionally connected via a circular arc edge 3; the main cutting edge 1 extends to the side of the front cutting face via a main cutting edge tip radius 10; the secondary cutting edge 2 extends to the intersection line of the radial positioning face 6 and the first end face 4 via a secondary cutting edge tip radius 11; a screw hole 14 is provided at the center of the radial positioning face 6; the first end face 4 and the second end face 5 are arranged opposite to each other.

[0036] like Figures 1 to 5 As shown, in this embodiment, the blade body adopts a rectangular symmetrical design, the screw hole 14 is set at the center of the radial positioning surface 6, and the cutting force is distributed along the blade positioning surface direction, reducing the load on the screw and making the blade clamping more stable.

[0037] The blade body also includes a main cutting edge flank 12, a secondary cutting edge flank 13 and a cutting plane. The main cutting edge flank 12 and the secondary cutting edge flank 13 are connected by an arc surface 7, and the main cutting edge flank 12 and the secondary cutting edge flank 13 are inclined in opposite directions. The cutting plane is a plane passing through the main cutting edge 1 and along the cutting speed direction of the blade; the main cutting edge flank 12 serves as an air avoidance surface, and the secondary cutting edge flank 13 serves as an axial positioning surface. The blade body forms a double constraint through the radial positioning surface 6 and the axial positioning surface (secondary cutting edge flank 13), which can avoid the axial displacement of the blade when the cutting force is applied, and improve the stability of part processing. A main cutting edge back angle θ is formed between the main cutting edge back face 12 and the cutting plane, and the main cutting edge back angle θ is set to -7°. A secondary cutting edge back angle is formed between the secondary cutting edge back face 13 and the cutting plane, and the secondary cutting edge back angle is the same size and opposite in direction to the main cutting edge back angle θ; the main deflection angle Φ1 is 22°, which improves cutting stability. The radii of the main cutting edge tip radius 10 and the secondary cutting edge tip radius 11 are both 1mm. Among them, the main cutting edge tip radius 10 extends to one side of the front cutting face, and the secondary cutting edge tip radius 11 extends to the intersection of the radial positioning surface 6 and the first end face 4 to enhance impact resistance. The main cutting edge tip radius 10, the main cutting edge 1, the arc edge 3, the secondary cutting edge 2 and the secondary cutting edge tip radius 11 are connected in sequence, and the heights of all cutting edges are higher than the first end face 4.

[0038] like Figure 2 and Figure 3As shown, the rake face is a double inclined surface design, including a first rake face 8 and a second rake face 9. Both the first rake face 8 and the second rake face 9 are inclined along the inside of the blade body, and the first rake angle α on the blade body is 15°, and the second rake angle β is 25°. Combined with the arc edge 3 transitionally connecting the main cutting edge 1, the secondary cutting edge 2 and the 0.1mm edge band 15 design, it can effectively reduce the impact of cutting heat on the cutting edge and improve the chip removal efficiency, thereby extending the service life of the tool.

[0039] Example 2

[0040] like Figures 1 to 3 As shown, a vertically mounted fast-feed milling cutter comprises a cutter body, wherein the cutter body comprises a first end face 4, a second end face 5, and a radial positioning face 6, wherein the radial positioning face 6 is respectively connected to the first end face 4 and the second end face 5; one end of the cutter body is a working end, and the other end is a non-working end, wherein the working end comprises a main cutting edge 1, a secondary cutting edge 2, and a front cutting face, wherein the main cutting edge 1 and the secondary cutting edge 2 are transitionally connected via a circular arc edge 3; the main cutting edge 1 extends to the side of the front cutting face via a main cutting edge tip radius 10; the secondary cutting edge 2 extends to the intersection line of the radial positioning face 6 and the first end face 4 via a secondary cutting edge tip radius 11; a screw hole 14 is provided at the center of the radial positioning face 6; the first end face 4 and the second end face 5 are arranged opposite to each other.

[0041] In this embodiment, the rake face is provided with double inclined surfaces, namely the first rake face 8 and the second rake face 9, which are combined with the arc surface 7 to connect the main cutting edge flank face 12 and the secondary cutting edge flank face 13 to form a continuous chip removal channel to reduce chip accumulation. A heat dissipation groove is provided between the main cutting edge flank face 12 and the secondary cutting edge flank face 13, and combined with the 0.1mm edge band width L2 design, a continuous heat dissipation channel can be formed to effectively reduce the cutting temperature.

[0042] Example 3

[0043] like Figures 1 to 3 As shown, a vertically mounted fast-feed milling cutter comprises a cutter body, wherein the cutter body comprises a first end face 4, a second end face 5, and a radial positioning face 6, wherein the radial positioning face 6 is respectively connected to the first end face 4 and the second end face 5; one end of the cutter body is a working end, and the other end is a non-working end, wherein the working end comprises a main cutting edge 1, a secondary cutting edge 2, and a front cutting face, wherein the main cutting edge 1 and the secondary cutting edge 2 are transitionally connected via a circular arc edge 3; the main cutting edge 1 extends to the side of the front cutting face via a main cutting edge tip radius 10; the secondary cutting edge 2 extends to the intersection line of the radial positioning face 6 and the first end face 4 via a secondary cutting edge tip radius 11; a screw hole 14 is provided at the center of the radial positioning face 6; the first end face 4 and the second end face 5 are arranged opposite to each other.

[0044] In this embodiment, if Figure 6 , Figure 8 As shown, after the blade body is matched and installed with the cutter disc 16, the blade is vertically embedded in the cutter disc 16 and fixed through the central screw hole 14. The radial angle γ of the cutter disc installation is 17°, and the axial angle δ is 5°. The radial positioning surface 6 cooperates with the radial angle γ and the axial angle δ of the cutter disc 16 to match the main cutting edge main deflection angle Φ1, and the effective cutting depth L1 is 1.8mm, so that the feed rate can be increased by at least 0.3mm / z, achieving stable cutting with large cutting depth and high feed.

[0045] like Figure 7 As shown, the blade body is installed in conjunction with the cutter disc 16, and the axial clearance angle Φ2 at the tail of the blade increases the gap between the tool and the workpiece, reduces the friction between the back tool face and the machined surface during the cutting process, reduces cutting heat accumulation and tool wear, and thus increases the service life of the tool.

[0046] In this embodiment, the milling blade is made of alloy steel to improve the hardness and wear resistance of the blade.

[0047] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vertical fast feed milling cutter, comprising a cutter body, characterized in that: The blade body includes a first end face, a second end face and a radial positioning surface, and the radial positioning surface is connected to the first end face and the second end face respectively; one end of the blade body is a working end, and the other end is a non-working end, and the working end includes a main cutting edge, a secondary cutting edge and a front cutting face, and the main cutting edge and the secondary cutting edge are connected through an arc edge transition; the main cutting edge extends to the side of the front cutting face through the radius of the main cutting edge tip; the secondary cutting edge extends to the intersection line of the radial positioning surface and the first end face through the radius of the secondary cutting edge tip; a screw hole is provided at the center of the radial positioning surface.

2. The vertical fast feed milling cutter according to claim 1, characterized in that: The main cutting edge tip radius, the main cutting edge, the arc edge, the secondary cutting edge and the secondary cutting edge tip radius are connected in sequence.

3. The vertical fast feed milling cutter according to claim 1, characterized in that: The rake surface is a double inclined surface, and the rake surface includes a first rake surface and a second rake surface, and both the first rake surface and the second rake surface are inclined along the inside of the blade body.

4. The vertically mounted fast feed milling cutter according to claim 1, characterized in that: It also includes a first rake angle and a second rake angle, wherein the first rake angle is 15° and the second rake angle is 25°.

5. The vertically mounted fast feed milling cutter according to claim 1, characterized in that: It also includes a land, and the width of the land is 0.1 mm.

6. The vertically mounted fast feed milling cutter according to claim 1, characterized in that: It also includes a main cutting edge flank, a secondary cutting edge flank and a cutting plane. The main cutting edge flank is connected to the secondary cutting edge flank via an arc surface, and the main cutting edge flank is inclined in opposite directions to the secondary cutting edge flank.

7. The vertically mounted fast feed milling cutter according to claim 6, characterized in that: A main cutting edge clearance angle is formed between the main cutting edge clearance surface and the cutting plane, and the main cutting edge clearance angle is -7°.

8. The vertically mounted fast feed milling cutter according to claim 6, characterized in that: A secondary cutting edge clearance angle is formed between the secondary cutting edge clearance surface and the cutting plane, and the secondary cutting edge clearance angle is 7°.

9. The vertically mounted fast feed milling cutter according to claim 1, characterized in that: The effective cutting depth of the blade body is 1.8 mm.

10. A cutter disc, characterized in that: When used in conjunction with the vertically mounted fast-feed milling cutter blade according to any one of claims 1 to 9, the radial angle and axial angle of the cutter disc installation are 17° and 5° respectively.

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