Face milling cutter with BT interface and machining method of face milling cutter

Abstract

The invention relates to the technical field of face milling cutter equipment, and discloses a face milling cutter with a BT interface and a machining method thereof.The face milling cutter comprises a BT connecting handle, and a cutter is arranged on the lower portion of the BT connecting handle; the cutter comprises cutter teeth and cutter grooves which are uniformly arranged at intervals; the number of the cutter teeth is an odd number, each cutter tooth is arranged to be of a double-micro positive blade type, and the tipping value of a cutting edge is lower than the mu level. The length of the cutting edge of each cutter tooth is 7mm, and the width of the cutting edge of each cutter tooth is 3mm; and the cross section of the cutter groove is a dovetail groove with an included angle of 70 degrees. Finish machining can be completed at a time when the cutting depth is smaller than 3 mm, two times of machining are not needed, the machining period is shortened, the surface smoothness is superior to Ra0.8, the surface is free of vibration marks, the cutting noise is low, vibration is light, and the machining efficiency and the machining precision are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of face milling tool equipment, and in particular to a face milling tool with a BT interface and a processing method thereof. Background Art

[0002] In the current field of mechanical processing, face milling cutters are key cutting tools, and their performance and efficiency are directly related to the overall output and product quality of the production line. However, when the existing face milling cutters are actually installed, additional conversion settings are required, which not only increases the complexity of the installation steps, but also leads to inconvenience in the clamping process and reduced operational flexibility. This conversion process is also limited by the settings, making it difficult to use the cutters in a more diversified way.

[0003] More importantly, existing face milling tools are prone to vibration during high-speed cutting, which is accompanied by significant cutting noise and vibration, which not only seriously affects the cutting accuracy and surface finish of the workpiece, but also accelerates the wear of the tool and machine tool, increasing production and maintenance costs. At the same time, existing tools are also prone to frequent blockages during the cutting process due to the difficulty in discharging chips, which often requires interruption of the processing flow for cleaning, affecting processing efficiency, and the retention of chips may also scratch the surface of the workpiece, affecting product quality.

[0004] Moreover, as modern manufacturing industry places increasing demands on workpiece material strength and surface finish, traditional face milling tools are unable to meet the requirements of high-strength material processing or high-finish surface processing, and often need to rely on subsequent secondary processing to achieve the desired effect. Not only does it increase the processing steps, it also increases production costs, reduces overall processing efficiency, and is unable to meet the current demand for high-efficiency, high-quality processing. Summary of the invention

[0005] The present invention aims to provide a face milling tool with a BT interface and a processing method thereof, so as to solve the problems that the existing face milling tools are inconvenient to install and use, have low versatility, and are prone to chip blockage, affecting product quality. At the same time, the existing tools are difficult to meet the processing requirements of high strength and high finish, and secondary processing is often required, which increases the production cycle and affects the processing efficiency and product quality.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a face milling tool with a BT interface, comprising a BT shank, and a tool is provided at the lower part of the BT shank; the tool comprises teeth and grooves evenly spaced; the teeth are arranged in odd number, each tooth is arranged as a double micro-positive edge type, and the cutting edge chipping value is lower than the μ level; the cutting edge length of each tooth is 7 mm and the width is 3 mm; the cross-section of the groove is a dovetail groove with an angle of 70°.

[0007] Furthermore, the double micro-positive edge type has an axial rake angle of 3° and a radial rake angle of 5° for the cutter teeth. The use of the double micro-positive edge type can ensure the strength of the cutting edge and ensure that the cutting edge is not easy to break during use. At the same time, the axial rake angle is set to 3°. During the continuous milling process, it can also have the effect of slightly throwing the chips up, which can prevent the chips from scratching the surface of the workpiece and thus reduce the surface quality of the product. The radial rake angle of 5° can ensure that the tip of the tool contacts the workpiece first, cutting smoothly, ensuring the strength of the tip of the tool and meeting the smoothness of the processing.

[0008] Furthermore, the cutting edge of the cutter tooth includes a main edge and a side edge, the main edge corresponds to a main deflection angle, and the side edge corresponds to a secondary deflection angle; the main deflection angle is 90°, ensuring its adaptability and versatility.

[0009] Furthermore, the tip of the blade teeth is an arc with a radius of 0.1 to 0.3 mm. If it is less than 0.1 mm, the strength of the blade tip will be reduced, and the blade tip will be prone to chipping, affecting the cutting effect; if it is greater than 0.3 mm, it will increase the cutting resistance, increase the wear on the tool, reduce the cutting efficiency, and also increase the processing energy consumption.

[0010] Furthermore, the side blade includes a wiper blade transitionally connected to the tool tip, and a finishing section connected to the wiper blade; the wiper blade is an arc section with a radius of 80 mm, and the finishing section is an inclined section with an inclination of 30°.

[0011] Furthermore, the angle radius of the knife groove is 0.5 mm.

[0012] Furthermore, the boundary dimensions of the tool groove are 10.8 mm and 1.4 mm respectively, which can provide sufficient chip space and good supporting strength.

[0013] At the same time, the present scheme also provides a method for processing a face milling tool with a BT interface, which is applied to the above-mentioned face milling tool, including setting a BT shank at the upper end of the tool, and directly connecting it to the machine tool through the BT shank; the diameter of the milling part of the tool edge is 32 mm; 7 teeth are evenly arranged on the circumference of the tool, the teeth are made of diamond, and grooves are provided between adjacent teeth; the cutting edge of the teeth is welded to the tool using low-temperature silver brazing material.

[0014] Furthermore, the cutting edge is made by laser finishing.

[0015] Furthermore, it also includes making a reference ring at the front section of the cutting edge, the reference ring is a bright circular ring with a width of 10mm, a diameter of 30.5mm, and a finish of Ra0.4. The transfer of the reference is realized, the transfer and detection of accuracy are convenient, and the consistency of the tool in production and use and the achievement of its own accuracy are guaranteed.

[0016] The principles and advantages of this solution are:

[0017] This solution is designed with a built-in BT shank, which can be directly installed on the machine tool through the BT shank without conversion, which is convenient for clamping and use. It is more convenient and efficient, can be applied to a variety of processing needs, and improves versatility. At the same time, this solution effectively avoids the vibration of the tool that may be caused by resonance during processing by accurately setting an odd number of teeth and its distribution structure, thereby reducing cutting noise and vibration. And by setting a double micro-positive edge, the cutting edge is ensured to be sharp and a larger cutting depth can be achieved. In combination with the dovetail groove structure, the chip space is ensured, the support strength of the tool body to the tool edge is guaranteed, and the chips can be discharged smoothly without scratching the workpiece surface, ensuring a good cutting surface finish. The tool of this solution can complete the milling process with one cut when the allowance is less than 3mm, and there is no need to adopt two processing processes of roughing and finishing. It greatly shortens the processing cycle, reduces production costs, improves overall efficiency, and ensures processing accuracy and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a face milling cutter with a BT interface according to the present invention.

[0019] Figure 2 The figure is a schematic diagram of the tooth distribution structure of a face milling cutter with a BT interface according to the present invention.

[0020] Figure 3 It is a schematic structural diagram of the chip space and supporting surface of a face milling cutter with a BT interface of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a double micro-positive cutting edge type of a face milling cutter with a BT interface according to the present invention.

[0022] Figure 5 The figure is a schematic diagram of a single tooth structure of a face milling cutter with a BT interface according to the present invention.

[0023] Figure 6 This is the blade tooth size structure diagram. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] Markings in the attached drawings are: BT shank 1, tool 2, cutter teeth 3, cutter grooves 4, main cutting edges 5, side cutting edges 6, tool tips 7, wiper cutting edges 8, finishing sections 9, tool cutting edge surfaces 10, tool back surfaces 11, and reference rings 12.

[0026] In this embodiment, a face milling cutter with a BT interface is made of diamond and can be directly installed on a machine tool without conversion. When the cutting depth is 3mm, one-cut processing can be achieved, which simplifies the processing process, shortens the processing time, ensures processing accuracy, and effectively improves processing efficiency. In this embodiment, as shown in the attached Figure 1 As shown, the face milling tool includes a self-mounted BT shank 1, i.e., a "Morse taper" tool holder interface, which is a tool holder interface standard connected to a machining center spindle through a tapered shank, and is used to directly connect the cutting tool to the machine tool. A tool 2 is integrally formed with the shank at the lower end of the BT shank 1.

[0027] As attached Figure 2 As shown, the tool 2 includes teeth 3 and grooves 4 that are evenly spaced. In this embodiment, an odd number of teeth 3 are evenly distributed on the rotating surface of the tool 2, and each tooth is set to a double micro-positive edge type, and the edge chipping value is lower than the μ level. Generally, for a milling cutter with a diameter of 32 mm, the number of teeth is set to an even number, mostly 6, based on processing efficiency and processing accuracy considerations, to maintain stability during the cutting process. However, this solution sets the number of teeth to an odd number, specifically setting the number of teeth to 7 while ensuring chip space and support strength, and evenly distributing them on the rotating surface. This can reduce the cutting force and vibration of each tooth more than an even number of teeth, and can also avoid the vibration of the tool caused by the periodic regular impact that may be caused by an even number of teeth, which is about 16% more efficient than an even number of teeth.

[0028] In this embodiment, the milling cutter generally has two angles, one is the axial rake angle, which is viewed from the tool axis direction; the other is the radial rake angle, which is viewed from the tool diameter direction. The axial rake angle and the radial rake angle are respectively a description of the tool tip position from the axial and radial directions, and both are a description of the cutting edge position angle based on the tool center and the rotation direction during processing. In this embodiment, the tool is set to a double micro-positive edge type, that is, as shown in the attached figure. Figure 4 As shown in the figure, the axial rake angle of the cutter teeth is 3° and the radial rake angle is 5°. It is suitable for milling of various types of aluminum alloys and copper alloys, and can meet the requirements of higher finish and efficiency, and can maintain good sharpness of the tool. At the same time, the double micro-positive edge shape ensures the smooth cutting of the tool, so that the tool can obtain good edge quality, have a certain self-sharpening ability, and stable wear results.

[0029] As attached Figure 5 As shown in the figure, the cutting edge length of each cutter tooth is set to 7mm and the width is 3mm. The 7mm length ensures that the tool can reach a cutting depth of 3mm when used for conventional face milling, and can also reach a side milling height of 6mm when side milling is required. By using a length of 7mm and a width of 3mm, an actual height of about 16mm can be obtained. 2The welding area is calculated based on the welding strength of 250MPa. The welding surface can provide a shear force of nearly 4000N, which is equivalent to a strength of 400kg. Therefore, it can ensure that the tool can meet the requirements of cutting depth and feed during use.

[0030] In this embodiment, the cutting edge of the cutter tooth includes a main edge 5 and a side edge 6, wherein the main edge 5 corresponds to the main rake angle, and the side edge 6 corresponds to the secondary rake angle. In this embodiment, the main rake angle is set to 90° to ensure its adaptability and versatility. Specifically, when used as a face milling tool tip, its strength is sufficient and the cutting assistance is not large; when used as a side milling tool, it is convenient to process the step, and by standardizing the tool path, it can also be used to process the cavity by milling around, which effectively expands the application scenarios of the tool, increases the processing range of the tool, and helps to reduce the frequency of tool changes and improve processing efficiency in terms of process.

[0031] In this embodiment, the tip 7 of the cutter tooth 3 is set to an arc structure with a radius of 0.1 to 0.3 mm, specifically set to 0.2 mm. If the tip arc is too small (such as less than R0.1), the tip strength will be significantly reduced, and abnormalities such as tip chipping are likely to occur in actual applications, affecting the cutting accuracy of the tool. If the tip arc is too large, its cutting resistance will gradually increase, especially after it is greater than R0.4, the resistance brought by the tip arc will become greater and greater. Therefore, combined with other use requirements of the tool, its tip arc should not exceed R0.3. Therefore, in this embodiment, the tip arc is set to R0.2 mm.

[0032] The side edge 6 includes a wiper edge 8 transitionally connected to the blade tip 7, and a tail section 9 connected to the wiper edge 8. In this embodiment, the wiper edge 8 is an arc section with a radius of 80 mm, and the tail section 9 is an inclined section with an inclination of 30°. Figure 6 As shown in the figure, it is composed of a tool tip arc and a secondary deflection angle, without a wiper blade, and is easy to manufacture. However, after processing, the surface of the workpiece will produce circles of regular tool marks. It is only suitable for processing with low requirements for finish, and further processing is required in the future. In order to ensure the maximum polishing effect, the measuring blade with a wiper blade will use a parallel blade edge, that is, the blade edge is parallel to the workpiece surface, but its manufacturing requirements and usage requirements are very high. Generally, an adjustable structure is required to adjust the blade edge to be as straight as possible with the workpiece surface to achieve the best polishing effect. At the same time, there are also high requirements for the rigidity of the machine tool and the strength of the workpiece. Once the rigidity is insufficient, the parallel wiper blade will instead cause a ring defect of the same length as the wiper blade on the workpiece. Therefore, it is difficult to ensure the polishing effect of the wiper blade, affecting the processing efficiency and product quality.

[0033] This solution sets the secondary rake angle to a large arc structure, using an arc to replace the conventional angle. After the R0.2 tool tip arc, an R80 arc transition is used with the intersection below the center of the circle. The two arcs transition smoothly, and after completely leaving the cutting edge use area (extrusion area), it ends with a 30° inclined section to prevent chip interference and ensure the finishing effect.

[0034] In this embodiment, during the milling process of the workpiece, the large arc of R80 can effectively extrude the workpiece and optimize its surface finish to achieve a finishing effect. At the same time, practice has shown that it will also play a similar role as exerting downward pressure on the workpiece during processing, which can effectively reduce the up and down vibration of the workpiece during the cutting process. However, a finishing blade with a too small arc has a poor extrusion effect and insufficient finish; a finishing blade with a too large arc has a good extrusion effect, but the cutting force increases accordingly. After the tip of the tool is worn, excessive extrusion (i.e., fuzzing) is likely to occur on the surface of the aluminum alloy workpiece. According to actual production verification, a circular arc finishing blade 8 with a radius of 80 mm is used. Even if the feed rate is increased to 0.3 mm per tooth (generally 0.1 to 0.15 mm), its cutting edge can make the maximum unevenness of the workpiece surface better than 0.5 μ, thereby meeting the finishing requirements under high intensity.

[0035] As attached Figure 2 As shown, the cross section of the knife groove 4 is a dovetail groove structure with an angle of 70°. In this embodiment, the angle radius of the knife groove 4 is 0.5mm, and the short side width is 5mm. The boundary dimensions of the knife groove 4 are 1.4mm and 10.8mm respectively, that is, when the cutting edge is placed vertically, as shown in the attached Figure 2 In the position shown, the vertical distance from the tool center to the tool edge 10 is 1.4mm (tip height - 1.4mm), and the vertical distance from the tool center to the tool back 11 is 10.8mm (i.e. tooth thickness 10.8mm). Combined with the design and processing of the 70° dovetail groove, this tool can also provide the following in the case of 7 teeth distribution. Figure 3 The cross-sectional area shown is approximately 26.75 mm 2 The chip space and the diameter of the chip 2 The support surface ensures sufficient chip space and good support strength. When the number of teeth is increased, it can also provide sufficient support strength to enable the tool to meet the cutting depth requirements.

[0036] At the same time, in this embodiment, a method for processing a face milling tool with a BT interface is also provided. Applicable to the above-mentioned face milling tool. Including a BT shank integrally formed at the upper end of the tool, so that the tool is an integrated tool with a BT shank. It is directly connected to the machine tool through the BT shank. In this embodiment, a BT30 rivet is used during installation. The threaded end of the rivet is connected to the M12 thread of the BT end of the tool, and the other end is clamped and pulled by the machine tool, thereby ensuring a good fit between the conical surface and the machine tool, ensuring the accuracy of the tool, and no need for conversion, so that its concentricity is higher and the dynamic balancing effect is better. In this embodiment, the diameter of the milling part of the tool edge is 32mm, and the teeth are made of diamond. Seven teeth 3 are evenly welded on the circumference of the rotating surface of the tool, and a groove 4 is provided between adjacent teeth 3.

[0037] In this embodiment, the cutting edge of the cutter tooth 3 is welded to the tool using low-temperature silver brazing material to ensure welding strength. The cutting edge is made by laser finishing to ensure that the cutting edge chipping value below μ level can be obtained to bring a smooth microscopic cutting edge, so that during the processing, the original chipping will not expand to form continuous chipping and shorten the life, so as to obtain uniform "tip-front blade-flank blade" wear, thereby achieving a self-sharpening effect, ensuring the stability of the tool use, and effectively extending the service life of the tool.

[0038] Meanwhile, in the present embodiment, the tool and the wiper blade are an integral structure, and after clamping, there is no need to adjust the position of the cutting edge and the tool can be used directly, thereby ensuring the wiper blade's wiper effect.

[0039] As attached Figure 1 As shown, it also includes making a reference ring 12 at the front end of the tool, specifically, setting a bright circular ring with a size slightly lower than the base at the position of the tool handle near the cutting edge. In this embodiment, the bright circular ring needs to be ground with a D40 fine grinding wheel before the tool cutting edge is processed, under the premise that the correction clamping accuracy is within 0.03, so as to ensure the accuracy and effectiveness of the reference ring 12. In this embodiment, the distance between the reference ring 12 and the bottom of the tool is 17.5mm, the width of the reference ring 12 is 10mm, the diameter is 30.5mm, and the surface finish is Ra0.4, so as to record the current installation position. So that in the subsequent use process, such as tool change, debugging, etc., according to the level of its own detection instrument, and in the installed state, by detecting the jump of the reference ring 12, it can be judged whether the tool is in the correct installation position, so that the BT handle is directly matched with the reference ring, the reference transfer of the tool is realized, the transfer and detection of accuracy are convenient, and the consistency of the tool in production and use and the standard of its own accuracy are guaranteed, and the convenience and accuracy of operation are improved.

[0040] In this embodiment, since conventional aluminum alloy and copper alloy finishing milling cutters require sharp tool edges, and the sharpness of the tool is required to be well maintained. Therefore, the axial angle setting range of the tool is 5 to 10°, and the radial angle setting range is 8 to 12° to ensure that the sharpness requirements can be achieved. This solution, while taking into account the requirements of larger cutting depth conditions and the use of an odd number of teeth, breaks through the inherent thinking of existing technical requirements and adopts a double micro-positive angle design, and adds a laser-processed micro-blade shape to form a reasonable double micro-positive blade shape and blade with an axial rake angle of 3° and a radial rake angle of 5°, to ensure the strength of the blade, so that the blade is not easy to break under high strength, and to ensure smooth processing.

[0041] In this embodiment, an odd number of teeth is used to reduce the vibration of the tool caused by periodic resonance, and the dovetail groove structure of the tool groove 4 effectively ensures the support strength of the tool body to the tool edge. The main deflection angle and the tool tip structure can meet the expanded application of the tool while meeting the purpose, improving versatility and ease of use. The tool can complete the processing in one cut without exceeding the cutting depth of 3mm, and ensure that the product's finish is better than Ra0.8, with low cutting noise and light vibration, and is suitable for milling of various aluminum alloys and copper alloys.

[0042] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A face milling cutter with a BT interface, characterized in that: It comprises a BT shank, at the lower part of which a tool is arranged; the tool comprises teeth and grooves evenly spaced; the teeth are arranged in odd number, each tooth is arranged as a double micro positive edge type, and the edge chipping value is lower than μ level; the cutting edge length of each tooth is 7 mm and the width is 3 mm; the cross section of the groove is a dovetail groove with an angle of 70°.

2. A face milling tool with a BT interface according to claim 1, characterized in that: The double micro-positive edge type has an axial rake angle of 3° and a radial rake angle of 5° for the blade teeth.

3. A face milling tool with a BT interface according to claim 1, characterized in that: The cutting edge of the cutter tooth includes a main edge and a side edge, the main edge corresponds to a main deflection angle, and the side edge corresponds to a secondary deflection angle; the main deflection angle is 90°.

4. A face milling tool with a BT interface according to claim 3, characterized in that: The tip of the blade tooth is an arc with a radius of 0.1 to 0.3 mm.

5. A face milling tool with a BT interface according to claim 4, characterized in that: The side blade includes a wiper blade transitionally connected to the tool tip, and a finishing section connected to the wiper blade; the wiper blade is an arc section with a radius of 80 mm, and the finishing section is an inclined section with an inclination of 30°.

6. A face milling tool with a BT interface according to claim 1, characterized in that: The angle radius of the knife groove is 0.5 mm.

7. A face milling tool with a BT interface according to claim 1, characterized in that: The boundary dimensions of the sipes are 10.8 mm and 1.4 mm respectively.

8. A method for machining a face milling tool with a BT interface, characterized in that: The face milling tool used in any one of claims 1 to 7 comprises a BT shank arranged at the upper end of the tool, which is directly connected to a machine tool via the BT shank; the diameter of the milling portion of the tool edge is 32 mm; 7 teeth are evenly arranged on the circumference of the tool, the teeth are made of diamond, and grooves are provided between adjacent teeth; the cutting edges of the teeth are welded to the tool using low-temperature silver brazing material.

9. A method for machining a face milling tool with a BT interface according to claim 8, characterized in that: The cutting edge is made by laser finishing.

10. The method for machining a face milling tool with a BT interface according to claim 8, characterized in that: The method also includes making a reference ring at the front end of the tool, wherein the reference ring is a bright circular ring with a width of 10 mm, a diameter of 30.5 mm and a finish of Ra0.4.

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