Diamond coating milling cutter with variable rake angle for processing composite material
By designing a diamond-coated milling cutter with varying rake angles for odd and even teeth, and combining it with a right-handed right-cutting chip removal groove and a left-handed right-cutting chip removal groove structure, the problems of burrs and chatter in the milling of CFRP materials were solved, thereby improving machining accuracy and tool life.
Patent Information
- Application Number
- CN202422346186.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-09-25
AI Technical Summary
CFRP materials are prone to defects such as burrs, fiber tears, delamination, and edge chipping during milling, resulting in rough machined surfaces, poor precision, and reduced tool life and machining efficiency.
A variable rake angle diamond-coated end mill with alternating rake angles of odd and even teeth is used. It combines right-handed chip evacuation grooves and left-handed chip breaking grooves with alternating nano-composite diamond coatings to improve cutting stability and chip breaking efficiency.
It reduces vibration during machining, improves machining quality and tool life, and enhances machining accuracy and efficiency.
Smart Images
Figure CN223518718U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a milling cutter, in particular to a variable rake angle diamond coating milling cutter for processing composite materials. BACKGROUND
[0002] Carbon fiber reinforced composite material (CFRP) is a composite material formed by taking carbon fiber or carbon fiber fabric as reinforcing body and taking resin, ceramic, metal, cement, carbon or rubber as matrix. Among many lightweight materials, it has high specific strength and specific rigidity, obvious lightweight effect, and is widely used in aerospace and military products.
[0003] It is known that common processing methods of CFRP material include laser processing, jet processing and milling processing, wherein the thickness of the workpiece and the heat affected zone need to be considered during laser processing, and jet processing is only suitable for side rough cutting, and the fluid may reduce the interlaminar bonding strength of CFRP. Compared with the former two, milling processing can be used for processing of complex shapes and most working conditions, so at present, cutting processing is still the main processing method of CFRP material. The poor processing performance of CFRP material seriously affects the use of the tool.
[0004] Usually, when using a diamond tooth milling cutter to mill the edge, blind groove and window of CFRP material, burrs, fiber tearing, delamination and edge collapse and other processing defects are formed, resulting in rough machining surface and poor precision, which reduces the service life of the tool and affects the processing efficiency. UTILITY MODEL CONTENTS
[0005] In order to solve the defects of the prior art, the utility model provides a variable rake angle diamond coating milling cutter for processing composite materials, which adopts odd tooth and even tooth peripheral edge rake angle change, cooperates with right-hand right-cut helical groove and left-hand right-cut chip removal groove, and has smooth machining surface, high precision, high efficiency, less burrs, improves the cutting stability of the tool and increases the service life of the tool.
[0006] In order to realize the above technical purpose, the utility model adopts the following technical scheme: a variable rake angle diamond coating milling cutter for processing composite materials, comprising a tool shank and a tool edge arranged at one end of the tool shank, the tool edge comprises an end edge part and a peripheral edge part, the end edge part is arranged at one end of the tool edge away from the tool shank, the end edge part comprises a plurality of end edges, a chip pocket is arranged between adjacent end edges, the peripheral edge part is arranged on the outer periphery of the tool edge, the peripheral edge part comprises a plurality of peripheral edges, a chip removal groove is arranged between adjacent peripheral edges, the chip removal groove is a right-hand right-cut structure, a chip breaking groove is arranged on the peripheral edge part, the chip breaking groove is a left-hand right-cut structure, the peripheral edge angle a41 of the odd tooth of the peripheral edge part is 2-3°, and the peripheral edge angle a42 of the even tooth of the peripheral edge part is 7-8°.
[0007] Further, the cutting edge surface is coated with a diamond coating, and the diamond coating adopts a nano-composite alternating structure.
[0008] Further, the diameter D1 of the cutting edge is 10mm, the spiral angle a3 of the chip flute is 13-17°, the interval L1 of the chip breaker is 2.25-2.45mm, the width L2 of the chip breaker is 1.15-1.35mm, the depth L3 of the chip breaker is 0.55-0.65mm, and the spiral angle a2 of the chip breaker is 45°-49°.
[0009] Further, the chip breaker is 10T.
[0010] Further, the peripheral edge part is 12T, the 1st, 3rd, 5th, 7th, 9th and 11th teeth are odd teeth, the peripheral edge rake angle a41 of the odd teeth is 3°, the 2nd, 4th, 6th, 8th and 10th teeth are even teeth, and the peripheral edge rake angle a42 of the even teeth is 8°.
[0011] Further, the diameter D1 of the cutting edge is 8mm, the spiral angle a3 of the chip flute is 13-17°, the interval L1 of the chip breaker is 2.24-2.44mm, the width L2 of the chip breaker is 1.1-1.3mm, the depth L3 of the chip breaker is 0.51-0.61mm, and the spiral angle a2 of the chip breaker is 45-49°.
[0012] Further, the chip breaker is 8T.
[0013] Further, the peripheral edge part is 10T, the 1st, 3rd, 5th and 7th teeth are odd teeth, the peripheral edge rake angle a41 of the odd teeth is 2°, the 2nd, 4th, 6th and 8th teeth are even teeth, and the peripheral edge rake angle a42 of the even teeth is 7°.
[0014] In summary, the milling cutter has the following technical effects:
[0015] The milling cutter changes the peripheral edge rake angles of the odd teeth and the even teeth, so that the cutting force of each tooth is different when the milling cutter processes the machining material, the vibration generated in the machining process is reduced, the burr problem is reduced, the quality of the processed machining material is improved, the cutting stability of the milling cutter is improved, and the service life of the milling cutter is increased.
[0016] The milling cutter solves the problem of CFRP material machining difficulty, increases the chip breaking efficiency of the milling cutter through the right-hand spiral right-hand cutting chip flute and the left-hand spiral right-hand cutting chip breaker structure, thereby reducing the vibration generated in the machining process, improving the cutting stability of the milling cutter, and increasing the service life of the milling cutter. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials;
[0018] Figure 2 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials; Figure 1
[0019] Figure 3 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials;
[0020] Figure 4 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials;
[0021] Figure 5 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials;
[0022] Figure 6 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials; Figure 1
[0023] It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials; Figure 7 Figure 6
[0024] Figure 8 It is a schematic view of a variable rake angle diamond coated milling cutter for processing composite materials; Figure 6 DETAILED DESCRIPTION
[0025] The utility model will be described in further detail below in connection with the drawings.
[0026] The specific embodiment is only the explanation of the utility model, and it is not the limitation of the utility model, and the person skilled in the art can make the modification of no creative contribution according to the need after reading the specification, but as long as in the claim range of the utility model, it is protected by the patent law.
[0027] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.
[0028] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0029] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0030] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly contacted through intermediate medium. Moreover, the "upper", "upper side" and "upper surface" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower side" and "lower surface" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0031] Embodiment:
[0032] Figure 1 It is a kind of variable rake angle diamond coating milling cutter for processing composite material schematic diagram, including shank and the cutting edge of the shank one end setting, cutting edge includes end blade part and peripheral blade part, end blade part is set at the end of cutting edge away from shank, end blade part includes several end blades, adjacent end blade is provided with chip groove, peripheral blade part is set at the outer periphery of cutting edge, peripheral blade part includes several peripheral blades, adjacent peripheral blade is provided with chip flute, chip flute is right-hand right cut structure, chip breaker is set on peripheral blade part, chip breaker is left-hand right cut structure, the peripheral blade rake angle a41=2-3 ° of odd teeth of peripheral blade part, the peripheral blade rake angle a42=7-8 ° of even teeth of peripheral blade part.
[0033] Figure 2 It is Figure 1 A portion of the enlarged schematic view of Figure 2 The side view showing chip breaker is shown in conjunction with Figure 1, the chip breaker is right-hand and right-cut structure, the spiral angle is a2, the chip breaker is right-hand and right-cut structure, the spiral angle is a3. The tool adopts the right-hand and right-cut chip breaker and the left-hand and right-cut chip breaker arranged on the peripheral edge, reduces the vibration generated when the tool cuts the machined material, makes the tool cutting more stable, and thus improves the machining precision and the service life of the tool.
[0034] Figure 3 is a schematic view of the cross section of the tool edge, the peripheral edge part is even teeth in the circumferential direction, wherein, Figure 4 is a schematic view of the peripheral edge rake angle measurement of the odd teeth, Figure 5 is a schematic view of the peripheral edge rake angle measurement of the even teeth, in the embodiment, the peripheral edge rake angle a41 of the odd teeth = 2-3°, the peripheral edge rake angle a42 of the even teeth = 7-8°, and the difference between the two is about 5°. The peripheral edge rake angle of the tool adopts the different way of the odd teeth and the even teeth, so that the cutting force of the odd teeth and the even teeth is different, the vibration is reduced, the surface quality of the machined material after machining is improved, the vibration is reduced, the cutting stability is improved, and the service life of the tool is improved.
[0035] Further, the tool edge surface is coated with a diamond coating, and the diamond coating adopts a nano composite alternating structure.
[0036] Further, the peripheral edge includes at least two long teeth, the rest are short teeth, and the at least two long teeth are over-center structure, the tool is mainly used for side milling, and the over-center long teeth can also facilitate the function of straight plunge milling.
[0037] Figure 6 is a left view of Figure 1 , Figure 7 is a schematic view of the enlarged B part of Figure 6 , the rake face is higher than the tool tip, Figure 8 is a schematic view of the C-C cross section of Figure 6 .
[0038] The embodiment gives two different specifications of milling cutter data:
[0039] (1) D10 milling cutter
[0040] The edge diameter D1 = 10 mm, the shank diameter D2 = 10 mm, the total length D4 = 80 mm, the butterfly angle a1 = 5°, the spiral angle a3 = 14.52°, the chip breaker spacing L1 = 2.35 mm, the chip breaker width L2 = 1.27 mm, the chip breaker depth L3 = 0.606 mm, the chip breaker spiral angle a2 = 47°, the tooth back width L4 = 0.927 mm, the tooth gap length 1.73 mm, the end face to the center distance 0.4 mm, d1 = core thickness 7.4 mm, Figure 6The high and low center is shown: the tooth gap rake face is higher than the center 0.035mm, the low center is 0.051mm, the pitch L6=1.424mm, the peripheral blade angle a5=20°, the end blade rake angle a6=-10°, the end blade angle a7=18°, the peripheral blade 12T indicates 12 teeth in a circle, the 1st, 3rd, 5th, 7th, 9th and 11th teeth are odd teeth, the peripheral blade rake angle a41=3° of the odd teeth, the 2nd, 4th, 6th, 8th, 10th and 12th teeth are even teeth, the peripheral blade rake angle a42=8° of the even teeth, the end blade 7T, indicating 7 end blades, the chip breaker groove 10T, indicating 10 chip breaker grooves.
[0041] (2) D8 milling cutter
[0042] The blade diameter D1=8mm, the shank diameter D2=8mm, the total length D4=75mm, the butterfly angle a1=5°, the spiral angle a3=15.21°, the distance of the chip breaker groove is L1=2.34mm, the width of the chip breaker groove is L2=1.234mm, the depth of the chip breaker groove is L3=0.564mm, the spiral angle a2=47° of the chip breaker groove, the tooth back width L4=0.954mm, the tooth gap length 1.518mm, the end face to the center distance 0.336mm, d1=core thickness 5.8mm, Figure 6 The high and low center is shown: the tooth gap rake face is higher than the center 0.05mm, the low center is 0.05mm, the pitch L6=1.574mm, the peripheral blade angle a5=20°, the end blade rake angle a6=-8°, the end blade angle a7=17°, the peripheral blade 10T indicates 10 teeth in a circle, the 1st, 3rd, 5th, 7th and 9th teeth are odd teeth, the peripheral blade rake angle a41=2° of the odd teeth, the 2nd, 4th, 6th, 8th and 10th teeth are even teeth, the peripheral blade rake angle a42=7° of the even teeth, the end blade 7T, indicating 7 end blades, the chip breaker groove 8T, indicating 8 chip breaker grooves.
[0043] The utility model discloses odd teeth peripheral blade rake angle 3 ° (2-3 °), even teeth peripheral blade rake angle 8 ° (7-8 °), when cutting, the cutting force of odd blade and even blade is not same, effectively reduces the vibration produced when the tool works, improves cutting stability, makes tool life increase, improves the surface quality of the workpiece being processed.
[0044] The peripheral blade rake angle can be changed according to the actual tool working condition of the customer's site.
[0045] The utility model discloses right-hand helical groove and left-hand chip breaker groove structure, reduce the tremor produced when the tool cuts the material being processed, make the cutting of tool more stable, thereby improve the machining precision and the service life of tool.
[0046] The utility model discloses diamond coating is coated on the surface of the tool blade, adopts nanometer composite alternation.
[0047] When the cutter is machining the machining material, the first peripheral edge of the cutter first mills the workpiece, and due to the chip breaking groove, the originally long chip is changed into a shorter chip, and due to the chip breaking groove, the machining surface will leave a part which is not milled, when the second peripheral edge of the cutter mills the workpiece, the part which is not milled will be cut off, and so on, so that the milling of the surface of the workpiece is realized.
[0048] The cutter end teeth can be designed as two long teeth, and the rest of the end teeth are short teeth, and the long teeth are over-center, so that the milling cutter can realize the plunge milling function, reduces the empty walking stroke, improves the machining efficiency, and saves the cost.
[0049] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form, and any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments are within the scope of the technical scheme of the present application.
Claims
1. A variable rake angle diamond coated milling tool for machining composite materials, characterized by: The tool bit comprises a shank and a cutting edge arranged at one end of the shank, the cutting edge comprises an end edge portion and a peripheral edge portion, the end edge portion is arranged at the end of the cutting edge away from the shank, the end edge portion comprises a plurality of end edges, and a chip groove is arranged between adjacent end edges, the peripheral edge portion is arranged at the outer periphery of the cutting edge, the peripheral edge portion comprises a plurality of peripheral edges, and a chip discharge groove is arranged between adjacent peripheral edges, the chip discharge groove is right-handed right-cut structure, a chip breaking groove is arranged on the peripheral edge portion, the chip breaking groove is left-handed right-cut structure, the peripheral edge portion of the odd-numbered teeth has a peripheral edge rake angle a41=2-3°, and the peripheral edge portion of the even-numbered teeth has a peripheral edge rake angle a42=7-8°.
2. A variable rake angle diamond coated milling tool for machining composite materials according to claim 1, characterized in that: The surface of the cutting edge is coated with a diamond coating, and the diamond coating adopts a nano-composite alternating structure.
3. A variable rake angle diamond coated milling tool for machining composite materials according to claim 1, characterized in that: The diameter of the cutting edge is D1=10mm, the spiral angle of the chip discharge groove is a3=13-17°, the pitch of the chip breaking groove is L1=2.25-2.45mm, the width of the chip breaking groove is L2=1.15-1.35mm, the depth of the chip breaking groove is L3=0.55-0.65mm, and the spiral angle of the chip breaking groove is a2=45-49°.
4. A variable rake angle diamond coated milling tool for machining composite materials according to claim 3, characterized in that: The chip breaking groove is 10T.
5. A variable rake angle diamond coated milling tool for machining composite materials according to claim 4, characterized in that: The peripheral edge portion is 12T, the 1st, 3rd, 5th, 7th, 9th and 11th teeth are odd-numbered teeth, the peripheral edge rake angle of the odd-numbered teeth is a41=3°, the 2nd, 4th, 6th, 8th, 10th and 12th teeth are even-numbered teeth, and the peripheral edge rake angle of the even-numbered teeth is a42=8°.
6. A variable rake angle diamond coated milling tool for machining composite materials according to claim 1, characterized in that: The diameter of the cutting edge is D1=8mm, the spiral angle of the chip discharge groove is a3=13-17°, the pitch of the chip breaking groove is L1=2.24-2.44mm, the width of the chip breaking groove is L2=1.1-1.3mm, the depth of the chip breaking groove is L3=0.51-0.61mm, and the spiral angle of the chip breaking groove is a2=45-49°.
7. A variable rake angle diamond coated milling tool for machining composite materials according to claim 6, characterized in that: The chip breaking groove is 8T.
8. A variable rake angle diamond coated milling tool for machining composite materials according to claim 7, characterized in that: The peripheral edge portion is 10T, the 1st, 3rd, 5th and 7th teeth are odd-numbered teeth, the peripheral edge rake angle of the odd-numbered teeth is a41=2°, the 2nd, 4th, 6th and 8th teeth are even-numbered teeth, and the peripheral edge rake angle of the even-numbered teeth is a42=7°.