Titanium alloy plate roughing cutter and titanium alloy plate roughing cutter

Abstract

The utility model provides titanium alloy plate rough milling cutter blade and titanium alloy plate rough milling cutter, and the negative chamfer is provided with to the side surface transition direction of cutting edge, when the diameter of blade body is 20mm, the width of negative chamfer is 0.42~0.62mm, when the diameter of blade body is greater than 20mm or is less than 20mm, the width of negative chamfer is increased or reduced according to the proportion of blade body diameter, and is increased or reduced in equal proportion, the rake face of blade includes first rake face and second rake face, and the included angle of first rake face and second rake face with base surface is first rake angle and second rake angle respectively, and first rake angle and second rake angle are all greater than 0 DEG. The utility model sets up the negative chamfer of wider, strengthens the strength of cutting edge, sets up two rake faces, and two rake angles are all greater than 0 DEG, first rake face is used for strengthening the strength of cutting edge, second rake face is used for reducing the chip force, makes the blade not only has higher strength, also has good sharpness, and the service life of blade is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and more specifically, to a rough milling insert and a rough milling tool for titanium alloy plates. Background Technology

[0002] Currently, the cutting tools available on the market for machining titanium alloys are all very sharp. However, in this field, such sharp blades are not very durable because titanium alloy sheets are forged, resulting in hard spots on the surface. Sharp blades lack sufficient strength and are prone to chipping. Figure 1 The image shows the outline of a cutting blade in the prior art, and it can be seen that the cutting edge is very sharp.

[0003] For example, the utility model patent with application number 201220718747.7 and titled "Indexable Circular Milling Insert and Milling Tool", as shown in Figure 5 of the patent, has a very sharp cutting edge on the indexable circular milling insert. Such inserts are prone to chipping when cutting titanium alloy plates.

[0004] Application number 200920215971.2, entitled "Three-Dimensional Groove Circular Milling Insert," as shown in Figures 4 and 5, describes a three-dimensional grooved circular milling insert with reinforcing chamfers to enhance the strength of the cutting edge. Those skilled in the art often use negative chamfers on milling inserts to enhance the cutting edge strength; the width of commonly used negative chamfers is at most 0.2 mm, but in practical use, chipping still easily occurs. This patent includes a first positive rake angle face and a second positive rake angle face, with the first positive rake angle being 0°. In a cutting tool, the rake face is the surface on which chips flow. A first positive rake angle of 0° improves tool strength but increases friction, cutting resistance, and causes chips to soften and stick to the tool. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a roughing milling insert for titanium alloy plates with high structural strength and low cutting force, which is suitable for cutting titanium alloy plates.

[0006] A rough milling insert for titanium alloy plates has a conical insert body, including an upper surface, a lower surface, and a side surface connecting the upper and lower surfaces. A insert positioning hole is provided at the geometric center of the insert body. The upper surface and the side surface form a cutting edge. A negative chamfer is provided in the transition direction of the cutting edge towards the side surface. When the diameter of the insert body is 20 mm, the width of the negative chamfer is 0.42–0.62 mm. When the diameter of the insert body is greater than or less than 20 mm, the width of the negative chamfer increases or decreases proportionally to the increase or decrease in the diameter of the insert body. The transition point between the cutting edge and the upper surface is a rake face, which includes a first rake face and a second rake face arranged sequentially from the cutting edge towards the insert positioning hole. The angles between the first and second rake faces and the base surface are the first rake angle and the second rake angle, respectively, both of which are greater than 0°.

[0007] The base plane is a plane parallel to the upper and lower surfaces. The angle between the first rake face and the second rake face and the base plane is the rake angle, the angle between the first rake face and the base plane is the first rake angle, and the angle between the second rake face and the base plane is the second rake angle.

[0008] In existing technology, the negative chamfer width of a 20mm diameter milling insert is at most 0.2mm. During use, the tool life is still short, and chipping is common. This invention increases the width of the negative chamfer to 0.42-0.62mm, increasing the strength of the cutting edge. Furthermore, to reduce chip force, this application improves the rake face by providing two rake faces, with the angles between the two parts and the base plane (i.e., the first rake angle and the second rake angle) both greater than 0°. The rake angle needs to balance sharpness and strength; a larger rake angle results in a sharper insert and less friction when chips flow over the rake face. The wider negative chamfer of this invention enhances the structural strength of the insert. While the two rake faces enhance the structural strength, the two rake angles also increase the sharpness of the insert. Therefore, the insert described in this invention possesses both high strength and satisfactory sharpness, making it suitable for cutting hard materials such as titanium alloy plates. If this invention only has a first rake face and a relatively wide negative chamfer, when used for cutting titanium alloy plates, the strength of the first rake face may still be insufficient because it needs to balance strength and sharpness. Therefore, a second rake face is also provided to further increase the strength of the blade while still meeting the sharpness requirements. The blade of this invention has a negative chamfer, a first rake face, and a second rake face, which is equivalent to the blade having three cutting edges.

[0009] The width of the negative chamfer increases or decreases proportionally to the increase or decrease in the diameter of the blade body. For example, when the diameter of the blade body is 40mm, the width of the negative chamfer is 0.84 to 1.24mm. When the diameter of the body is 10mm, the width of the negative chamfer is 0.21 to 0.31mm.

[0010] Negative chamfering refers to grinding a small bevel with a negative angle on the cutting edge of a cutting tool, which usually forms a certain angle with the back face.

[0011] Furthermore, the angle of the negative chamfer is -20° to -10°.

[0012] Furthermore, the angle of the first front angle is 3° to 5°.

[0013] Furthermore, the second anterior angle is larger than the first anterior angle.

[0014] Furthermore, the angle of the second front angle is 11° to 21°.

[0015] Furthermore, the negative chamfer, the first rake face, and the second rake face are connected by a circular arc transition in sequence.

[0016] Furthermore, when the diameter of the blade body is 20mm, the width of the first rake face is 0.37 to 0.57mm, and the width of the first rake face increases or decreases proportionally to the increase or decrease of the blade body diameter.

[0017] For example, when the diameter of the blade body is 40 mm, the width of the first rake face is 0.74–1.14 mm. When the diameter of the body is 10 mm, the width of the first rake face is 0.185–0.285 mm.

[0018] Furthermore, when the diameter of the blade body is 20mm, the width of the second rake face is 0.45-0.55mm, and the width of the second rake face increases or decreases proportionally to the increase or decrease of the blade body diameter.

[0019] For example, when the diameter of the blade body is 40 mm, the width of the second rake face is 0.9–1.1 mm. When the diameter of the body is 10 mm, the width of the second rake face is 0.225–0.275 mm.

[0020] Furthermore, the cutting edge is divided into eight identical unit edges; on the side surface, each unit edge has eight anti-rotation grooves. Each of the eight grooves corresponds to one unit edge, and the grooves position the unit edge. The titanium alloy plate roughing milling insert of this invention can be used eight times. The insert is mounted on the milling cutter head, and the insert positioning hole and grooves position the insert. The insert positioning hole is fitted with a fastener to fix the insert, and the grooves correspond to the protrusions on the cutter head, which effectively protects the tool and ensures better positional accuracy.

[0021] This utility model also provides a rough milling tool for titanium alloy plates, including a cutter head and a cutting insert, wherein the cutting insert is the titanium alloy plate rough milling insert described above.

[0022] This utility model has the following beneficial effects: The titanium alloy plate roughing milling insert of this utility model addresses the shortcomings of existing inserts, which are either too sharp, prone to chipping and have a short lifespan when cutting titanium alloy plates, or too dull, resulting in high cutting forces and easy chip adhesion. Firstly, a wider negative chamfer is designed, more than double the width of the negative chamfer in existing technology, to enhance the strength of the cutting edge. Furthermore, to ensure a certain level of sharpness, two rake faces are provided, both with rake angles greater than 0°. The first rake face strengthens the cutting edge, while the second rake face reduces chip force. This design gives the insert not only high strength but also good sharpness, significantly improving its service life. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram of a prior art blade; Figure 2 for Figure 1 A comparison diagram of the outline of a prior art blade and the outline of the blade in Example 1; Figure 3 This is a schematic diagram of the blade structure in Example 1.

[0024] The serial numbers are: 1-upper surface, 2-lower surface, 3-side surface, 4-insert positioning hole, 5-cutting edge, 6-negative chamfer, 7-first rake face, 8-second rake face, 9-groove. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0026] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Example 1 Roughing milling inserts for titanium alloy plates, such as Figure 3 As shown, the blade body is conical with a diameter of 20mm. It includes an upper surface 1, a lower surface 2, and a side surface 3 connecting the upper surface 1 and the lower surface 2. A blade positioning hole 4 is provided at the geometric center of the blade body. The upper surface 1 and the side surface 3 are connected to form a cutting edge 5. A negative chamfer 6 is provided in the transition direction of the cutting edge 5 towards the side surface. The width of the negative chamfer 6 is 0.42~0.62mm. The transition point between the cutting edge 5 and the upper surface 1 is the rake face. The rake face includes a first rake face 7 and a second rake face 8 arranged sequentially from the cutting edge 5 towards the blade positioning hole 4. The angles between the first rake face 7 and the second rake face 8 and the base surface are the first rake angle and the second rake angle, respectively. Both the first rake angle and the second rake angle are greater than 0°.

[0028] The angle of the negative chamfer 6 is -20° to -10°.

[0029] The angle of the first front angle is 3° to 5°.

[0030] The second anterior angle is greater than the first anterior angle.

[0031] The angle of the second front angle is 11° to 21°.

[0032] The negative chamfer 6, the first rake face 7, and the second rake face 8 are connected by a circular arc transition in sequence.

[0033] The width of the first rake face 7 is 0.37 to 0.57 mm.

[0034] The width of the second rake face 8 is 0.45 to 0.55 mm.

[0035] The cutting edge 5 is divided into 8 identical unit edges; on the side surface 3, each unit edge is provided with 8 grooves 9 for anti-rotation.

[0036] like Figure 2 As shown, it has the outline of two blades. Figure 2 In the middle, the outline at the bottom is Figure 1 The outline of a prior art blade is shown. Figure 2 In the image, the outline at the top is the outline of the blade in this embodiment. (By...) Figure 2 As can be seen, the blade in this embodiment includes three cutting edges: a negative chamfer 6, a first rake face 7, and a second rake face 8. The negative chamfer 6, the first rake face 7, and the second rake face 8 are sequentially connected by a rounded transition. The negative chamfer 6 and the first rake face 7 enhance the strength of the blade. The second rake angle is larger than the first rake angle. The second rake face 8 is used to reduce chip force, giving the blade not only high strength but also good sharpness, greatly improving its service life. The applicant, through practical operation, Figure 1 The blade shown in the diagram will chip after 20 minutes of continuous operation, while the blade described in this embodiment can work continuously for 4 hours without chip sticking to the blade.

[0037] Example 2 This is a roughing insert for titanium alloy plates. The insert body is conical with a diameter of 40mm. It includes an upper surface, a lower surface, and a side surface connecting the upper and lower surfaces. A insert positioning hole is provided at the geometric center of the insert body. The upper surface and the side surface meet to form a cutting edge. A negative chamfer is provided in the transition direction of the cutting edge towards the side surface, and the width of the negative chamfer is 0.84~1.24mm. The transition point between the cutting edge and the upper surface is a rake face, which includes a first rake face and a second rake face arranged sequentially from the cutting edge towards the insert positioning hole. The angles between the first rake face and the second rake face and the base surface are the first rake angle and the second rake angle, respectively, and both the first rake angle and the second rake angle are greater than 0°.

[0038] The angle of the negative chamfer is -20° to -10°.

[0039] The angle of the first front angle is 3° to 5°.

[0040] The second anterior angle is greater than the first anterior angle.

[0041] The angle of the second front angle is 11° to 21°.

[0042] The negative chamfer, the first rake face, and the second rake face are connected by a circular arc transition.

[0043] The width of the first rake face is 0.74 to 1.14 mm.

[0044] The width of the second rake face is 0.9 to 1.1 mm.

[0045] The cutting edge is divided into 8 identical unit edges; on the side surface, each unit edge is provided with 8 grooves for preventing rotation.

[0046] The difference between Example 2 and Example 1 is that the diameter of the body in Example 2 is 40mm, while the diameter of the body in Example 1 is 20mm. The dimensions of the negative chamfer, the first rake face, and the second rake face of the blade in this example are increased proportionally to the dimensions of the blade in Example 1.

[0047] Example 3 This is a roughing milling insert for titanium alloy plates. The insert body is conical with a diameter of 10mm. It includes an upper surface, a lower surface, and a side surface connecting the upper and lower surfaces. A insert positioning hole is provided at the geometric center of the insert body. The upper surface and the side surface meet to form a cutting edge. A negative chamfer is provided in the transition direction of the cutting edge towards the side surface, and the width of the negative chamfer is 0.21-0.31mm. The transition point between the cutting edge and the upper surface is a rake face, which includes a first rake face and a second rake face arranged sequentially from the cutting edge towards the insert positioning hole. The angles between the first rake face and the second rake face and the base surface are the first rake angle and the second rake angle, respectively, and both the first rake angle and the second rake angle are greater than 0°.

[0048] The angle of the negative chamfer is -20° to -10°.

[0049] The angle of the first front angle is 3° to 5°.

[0050] The second anterior angle is greater than the first anterior angle.

[0051] The angle of the second front angle is 11° to 21°.

[0052] The negative chamfer, the first rake face, and the second rake face are connected by a circular arc transition.

[0053] The width of the first rake face is 0.185 to 0.285 mm.

[0054] The width of the second rake face is 0.225 to 0.275 mm.

[0055] The cutting edge is divided into 8 identical unit edges; on the side surface, each unit edge is provided with 8 grooves for preventing rotation.

[0056] The difference between Example 3 and Example 1 is that the diameter of the body in Example 3 is 10mm, while the diameter of the body in Example 1 is 20mm. The dimensions of the negative chamfer, the first rake face, and the second rake face of the blade in this example are proportionally reduced compared to the dimensions of the blade in Example 1.

[0057] Example 4 A rough milling cutter for titanium alloy plates includes a cutter head and inserts, wherein the inserts are the rough milling inserts for titanium alloy plates described in Example 1. On the side surface of the insert described in Example 1, eight anti-rotation grooves are provided at each corresponding position of a unit cutting edge. Each of the eight grooves corresponds to one unit cutting edge, and the grooves position the unit cutting edge. The insert described in Example 1 is mounted on the cutter head, and the insert positioning hole and the grooves position the insert. The insert positioning hole is fitted with a fastener to fix the insert, and the grooves correspond to protrusions on the cutter head, which can effectively protect the cutter and ensure better positional accuracy.

[0058] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the present utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of the present utility model.

Claims

1. A rough milling insert for titanium alloy plates, the insert body being conical, including an upper surface, a lower surface, and a side surface connecting the upper and lower surfaces, wherein a insert positioning hole is provided at the geometric center of the insert body; the upper surface and the side surface are in contact to form a cutting edge; characterized in that, The cutting edge is provided with a negative chamfer in the transition direction to the side. When the diameter of the insert body is 20mm, the width of the negative chamfer is 0.42-0.62mm. When the diameter of the insert body is greater than 20mm or less than 20mm, the width of the negative chamfer increases or decreases proportionally to the increase or decrease of the insert body diameter. The transition point between the cutting edge and the upper surface is the rake face. The rake face includes a first rake face and a second rake face arranged sequentially from the cutting edge towards the insert positioning hole. The angles between the first rake face and the second rake face and the base surface are the first rake angle and the second rake angle, respectively. Both the first rake angle and the second rake angle are greater than 0°.

2. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, The angle of the negative chamfer is -20° to -10°.

3. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, The angle of the first front angle is 3° to 5°.

4. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, The second anterior angle is greater than the first anterior angle.

5. The roughing milling cutter for titanium alloy plates according to claim 3, characterized in that, The angle of the second front angle is 11° to 21°.

6. The roughing milling cutter for titanium alloy plates according to claim 5, characterized in that, The negative chamfer, the first rake face, and the second rake face are connected by a circular arc transition.

7. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, When the diameter of the blade body is 20mm, the width of the first rake face is 0.37-0.57mm. The width of the first rake face increases or decreases proportionally to the increase or decrease of the blade body diameter.

8. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, When the diameter of the blade body is 20mm, the width of the second rake face is 0.45-0.55mm. The width of the second rake face increases or decreases proportionally to the increase or decrease of the blade body diameter.

9. The roughing milling cutter for titanium alloy plates according to claim 1, characterized in that, The cutting edge is divided into 8 identical unit edges; on the side surface, each unit edge is provided with 8 grooves for preventing rotation.

10. A rough milling cutter for titanium alloy plates, comprising a cutter head and inserts, characterized in that, The cutting tool is a rough milling tool for titanium alloy plates as described in any one of claims 1 to 9.

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