A milling cutter for aluminum alloy workpieces

Abstract

The application discloses a milling cutter for aluminum alloy workpieces, which comprises a cutter disc, wherein the cutter disc is integrally formed by high-speed steel or hard alloy; a plurality of assembly positions for assembling combined blades are formed on the outer edge of the lower disc surface of the cutter disc; a single set of combined blades comprises a first blade and a second blade; the first blade is an isosceles trapezoidal blade, the bevel of which is the feed side; the second blade is formed on the bottom surface of a backing block; the first blade is a hard alloy blade; the base body of the second blade is a high-speed steel base body, two layers of diamond film coatings are sequentially formed on the surface corresponding to the blade teeth position, and the outer layer of the two layers of diamond film coatings is doped with molybdenum alloy particles with a mass ratio of 10-15%. The milling cutter can be used for surface milling of aluminum alloy workpieces, has high machining precision, is not prone to sticking to the cutter, can effectively prolong the service life of the milling cutter, and saves production cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing, and particularly relates to a milling cutter disc for milling processing of an aluminum alloy workpiece. BACKGROUND

[0002] At present, aluminum alloy is a kind of material which is applied more in modern industry, and has been applied in various industries such as mechanical manufacturing and design, die pressure processing manufacturing, etc.; with the progress of human civilization and the rapid development of science and technology and new technology, more and more aluminum alloy materials are needed. In the field of processing of aluminum alloy workpieces, many workpieces with a plane are often encountered, and the smooth plane meeting the use requirement is obtained by milling processing of the plane of the workpiece, which is the basic requirement of the milling processing of the plane of the workpiece.

[0003] At present, the milling processing of the workpiece with a large plane is mostly carried out by using a large-angle insert disc milling cutter or an end milling cutter with a large diameter. Since the end face runout value of the milling cutter blade is large, the aluminum alloy workpiece, especially the aluminum alloy workpiece with a large plane, is prone to have roughness defects on the surface of the workpiece in the processing process. In order to ensure the accuracy of the milling size, in the prior art, the milling processing is mostly carried out by using a twice-feeding method, that is, a rough milling cutter is used for processing first, and then a sharp edge fine milling cutter is used for fine processing, and the quality of the milling processing is adjusted by using different depths of feeding, and the rough milling operation needs to be repeated for many times in the fine milling process. This operation mode greatly reduces the processing efficiency, and requires high experience and level of the operator.

[0004] In addition, compared with the conventional steel structure, the aluminum alloy has the material characteristics of low hardness, low plasticity and low melting point, and the material characteristics make the load of the milling cutter relatively small when the aluminum alloy workpiece is subjected to the milling operation. However, in view of the higher and higher requirements for the repairing precision in the related technical field in the prior art, a high milling speed is still required when the aluminum alloy surface is subjected to the milling processing of the high light mirror surface. The processing condition of small load and high speed will make the heat generated by the friction between the cutter and the workpiece stay and accumulate on the surface of the aluminum alloy scrap, and make the hard alloy face milling blade used in the milling process generate the phenomenon of "sticking cutter", that is, the aluminum alloy scrap adheres to the milling blade. The "sticking cutter" phenomenon will make the aluminum alloy (especially the high-silicon aluminum alloy with a silicon content higher than 10%) easily wear the cutter during the machining operation, and cause the conventional milling cutter to have the defects of fast wear and short processing life when the aluminum alloy workpiece is machined.

[0005] For the reasons mentioned above, the processing cost of machining aluminum alloy workpieces using conventional face milling cutter structures in existing technologies remains high. Therefore, there is an urgent need for a dressing milling cutter designed specifically for the material properties of aluminum alloy products, in order to balance the processing quality and efficiency of aluminum alloy products. Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a milling cutter disc for aluminum alloy workpieces, so as to overcome the shortcomings in the above-mentioned background art.

[0007] The technical problem solved by this invention is achieved by the following technical solution:

[0008] A milling cutter disc for aluminum alloy workpieces, comprising a cutter disc;

[0009] A coaxial connector integrally formed with the cutter head is formed on the upper surface of the cutter head, and the cutter head is assembled onto the equipment shaft through the coaxial connector.

[0010] The cutter head is integrally formed from high-speed steel or cemented carbide with a hardness of not less than HRC65;

[0011] Multiple mounting positions are formed on the outer edge of the lower surface of the cutter head. These mounting positions are evenly distributed on the outer ring surface of the lower surface and are used to assemble groups of combined inserts. Each group of combined inserts includes a first insert and a second insert. In the rotation direction of the milling cutter head, the first insert is in front and the second insert is behind. The first insert is an isosceles trapezoidal insert with its inclined surface as the infeed side. The second insert is mounted on the surface of a liner block, which is made of cemented carbide with a hardness range of 52 to 58 HRC. The liner block is L-shaped and is wrapped around the bottom and side surfaces of the mounting positions. The second insert is formed on the bottom surface of the liner block and has downwardly protruding cutting teeth. The lower surface of the cutting teeth corresponds to a plane that is 300 to 800 μm higher than the cutting plane of the first insert tip.

[0012] The first blade is a cemented carbide blade with a tip hardness of 72-76 HRC;

[0013] The substrate of the second blade is a high-speed steel substrate with a hardness of 60-68 HRC. Two diamond film coatings are sequentially formed on the surface of the substrate at the corresponding blade tooth position. The outer diamond film coating of the two diamond film coatings is doped with rhenium alloy particles at a mass ratio of 10-15%.

[0014] As a further limitation, the area ratio of the multiple assembly positions formed on the outer edge of the lower plate to the corresponding annular surface of the lower plate is 30-40%.

[0015] As a further limitation, the cutter head is formed with a blind groove matching the size of the pad on the lower disc assembly position, the pad is assembled in the blind groove, and the pad assembled in the blind groove is in close contact with the surface of the first blade on the front side surface; the second blade is assembled in the middle position of the pad to reserve a chip clearance between the first blade and the second blade through the pad surface.

[0016] As a further limitation, the first blade is a tungsten steel blade with a Co content of 7-9%.

[0017] As a further limitation, the cutting edge of the first blade is embedded with polycrystalline diamond.

[0018] As a further limitation, the rake angle of the first blade is 15°, and the relief angle is 25°.

[0019] As a further limitation, the inner layer of the two-layer diamond film coating is a micron-level diamond film coating with a film layer thickness of 1-2 μm, and the outer layer of the two-layer diamond film coating is a nanometer-level diamond film coating with a film layer thickness of 3-5 μm.

[0020] As a further limitation, the two-layer diamond film coating is formed by chemical vapor deposition, and the nanometer-level molybdenum alloy particles are directly sprayed on the surface of the outer layer of the diamond film coating during the formation of the outer layer of the diamond film coating by thermal spraying.

[0021] As a further limitation, the molybdenum alloy particles are rhenium molybdenum alloy, preferably Mo-Re-Hf-Zr alloy or Mo-Re-Hf-V alloy.

[0022] As a further limitation, the second blade is replaced when the distance between the corresponding plane of the lower surface of the blade tooth and the cutting plane of the nose of the first blade is less than 200 μm.

[0023] Beneficial effects: the milling cutter disc for aluminum alloy workpieces of the present application replaces the traditional insert disc milling cutter or large-diameter end milling cutter by arranging a plurality of combined blades in groups on the disc surface of the milling cutter disc, which utilizes the first blade and the second blade for group operation, utilizes the second blade for surface optimization of the milling surface, optimizes the surface performance of the aluminum alloy workpiece, reduces the friction coefficient, and then utilizes the first blade for feed operation, so that the machined workpiece has high precision and good finish, and the machining surface of the aluminum alloy product can reach high mirror surface effect without the need for secondary polishing treatment; and the first blade surface is not prone to have nodules due to the "sticking" phenomenon, thereby improving the service life of the milling cutter. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A structural schematic diagram of a preferred embodiment of the present application.

[0025] Wherein: 1, coaxial connector; 2, cutter head; 3, combined cutter; 4, first cutter; 5, assembly bolt; 6, pad; 7, second cutter. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in conjunction with specific embodiments. The described embodiments are only a part of the embodiments of the present application, not all.

[0027] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that in the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the meaning of "a plurality of" is two or more, and the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements; for those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0029] Reference Figure 1 A preferred embodiment of a milling cutter for aluminum alloy workpieces according to the present application, in this embodiment, the milling cutter for aluminum alloy workpieces comprises a cutter head 2, and a coaxial connector 1 coaxially arranged on the upper surface of the cutter head 2, the coaxial connector 1 has an assembly part at the upper part, the milling cutter is assembled on the main shaft of the equipment through the assembly part, and the milling cutter is driven to rotate by the main shaft of the equipment to perform milling operation. In order to ensure the overall structural strength of the cutter head 2, the entire cutter head 2 and the coaxial connector 1 formed thereon are formed by high-speed steel with a hardness of HRC68.

[0030] The cutter head 2 is provided with six assembly positions on the outer edge of the lower disc surface, these assembly positions are uniformly arranged on the outer annular surface of the lower disc surface, and each assembly position is correspondingly provided with a combined cutter 3. The sum of the area ratios of the assembly positions on the corresponding annular surface of the lower disc surface is 36% of the area of the annular surface, so that the combined cutters 3 can be cooled through the above-mentioned gap space between the combined cutters 3 during milling operation.

[0031] In the embodiment, the combined blade 3 comprises the first blade 4 and the second blade 7, and the corresponding cutter head 2 is driven by the main shaft of the device to rotate at a high speed in an anticlockwise direction. In the rotating direction, the first blade 4 on the combined blade 3 serves as the infeed side, and the second blade 7 serves as the outfeed side. In the milling operation, the first blade 4 mainly serves to perform infeed cutting on the machining plane, and the second blade 7 serves to perform surface extrusion and auxiliary cutting on the machining plane.

[0032] In different embodiments, the first blade 4 is a cemented carbide tool with a tool head hardness of 72-76 HRC. In order to achieve the above hardness, in the embodiment, the first blade 4 is a cemented carbide tungsten steel tool with a Co content of 9%, and the corresponding tool head hardness is 76 HRC. A polycrystalline diamond is embedded on the cutting edge of the first blade 4 to improve the cutting performance of the first blade 4.

[0033] The tool body cross section of the first blade 4 is an isosceles trapezoidal structure, the inclined surface of the isosceles trapezoid is the infeed side, and a trapezoidal groove matching the size of the first blade 4 is formed at the corresponding assembly position of the first blade 4. During assembly, the corresponding first blade 4 is embedded in the trapezoidal groove, and then the bolt 5 is tightened in the pattern shown in the figure at the corresponding assembly hole position outside the first blade 4 to complete the assembly. The infeed rake angle of the first blade 4 after assembly is 15°, and the outfeed clearance angle is 25°.

[0034] An L-shaped blind groove is arranged at the rear side of the trapezoidal groove corresponding to the assembly position of the first blade 4. The two right angles of the L-shaped blind groove correspond to the bottom surface and the outer circular surface of the cutter head 2, respectively. A gasket 6 matching the size of the L-shaped blind groove is assembled at the position of the L-shaped blind groove of the milling cutter head. The gasket 6 is formed of cemented carbide with a hardness range of 52-58 HRC, and is wrapped around the bottom surface and the outer surface of the cutter head 2 at the corresponding position of the L-shaped blind groove. The gasket 6 abuts against the rear surface of the first blade 4 after assembly on the inner side, and can be used to limit the rear side of the first blade 4 during infeed.

[0035] The gasket 6 serves as the base body of the second blade 7. In the embodiment, the second blade 7 is also an L-shaped structure, which is directly formed at the middle position of the second blade 7 in the pattern shown in the figure, so that a gap is left between the second blade 7 and the first blade 4 for chip removal on the surface of the gasket. The second blade 7 has a downwardly protruding tooth in the horizontal plane, and the lower surface of the tooth is 300-800 μm higher than the first blade tip cutting plane.

[0036] The whole second blade 7 comprises a base body and two layers of diamond film coating shaped on the corresponding tooth position of the base body surface, the base body is a high speed steel base body with hardness of 60-68 HRC, the base body surface is shaped with an inner layer of diamond film coating, the inner layer of diamond film coating is a micron level diamond film coating with a film layer thickness of 1.5 μm, the diamond film coating is shaped on the base body surface by chemical vapor deposition method; the outer layer of diamond film coating on the surface of the inner layer of diamond film coating is also shaped by chemical vapor deposition method, which is a nanometer level diamond film coating with a thickness of 4 μm. At the same time, nanometer molybdenum alloy particles are doped and shaped on the surface of the outer layer of diamond film coating, the nanometer molybdenum alloy particles are obtained by directly spraying on the surface of the outer layer of diamond film coating by thermal spraying method during the shaping process of the outer layer of diamond film coating, and the amount is 10-15% of the mass of the outer layer of diamond film coating; and the corresponding molybdenum alloy particles are Mo-Re-Hf-V alloy in rhenium molybdenum alloy, wherein the content of rhenium in the alloy is 11%.

[0037] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A milling cutter disc for aluminum alloy workpieces, characterized in that, Including the cutter head; A coaxial connector integrally formed with the cutter head is formed on the upper surface of the cutter head, and the cutter head is assembled onto the equipment shaft through the coaxial connector. The cutter head is integrally formed from high-speed steel or cemented carbide with a hardness of not less than HRC65; Multiple mounting positions are formed on the outer edge of the lower surface of the cutter head. These mounting positions are evenly distributed on the outer ring surface of the lower surface and are used to assemble groups of combined inserts. Each group of combined inserts includes a first insert and a second insert. In the rotation direction of the milling cutter head, the first insert is in front and the second insert is behind. The first insert is an isosceles trapezoidal insert with its inclined surface as the infeed side. The second insert is mounted on the surface of a liner block, which is made of cemented carbide with a hardness range of 52~58HRC. The liner block is L-shaped and is wrapped around the bottom and side surfaces of the mounting positions. The second insert is formed on the bottom surface of the liner block and has downwardly protruding cutting teeth. The lower surface of the cutting teeth corresponds to a plane that is 300~800μm higher than the cutting plane of the tip of the first insert. The first blade is a cemented carbide blade with a tip hardness of 72~76HRC; The substrate of the second blade is a high-speed steel substrate with a hardness of 60~68HRC. Two diamond film coatings are sequentially formed on the surface of the substrate at the corresponding blade tooth position. The outer diamond film coating of the two diamond film coatings is doped with rhenium alloy particles at a mass ratio of 10~15%.

2. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The area of ​​the multiple assembly positions formed on the outer edge of the lower plate surface accounts for 30-40% of the area of ​​the corresponding annular surface of the lower plate surface.

3. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The cutter head has a blind groove formed on the lower plate mounting position that matches the size of the liner. The liner is mounted in the blind groove, and the liner mounted in the blind groove presses against the surface of the first blade on the front side. The second blade is mounted in the middle position of the liner so as to leave a chip removal gap between the first blade and the second blade through the surface of the liner.

4. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The first blade is a cemented carbide tungsten carbide blade with a Co content of 7-9%.

5. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The cutting edge of the first blade is inlaid with polycrystalline diamond.

6. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The first blade has a 15° infeed angle and a 25° outfeed angle.

7. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The inner diamond film coating of the two-layer diamond film coating is a micron-sized diamond film coating with a thickness of 1~2μm; the outer diamond film coating of the two-layer diamond film coating is a nano-sized diamond film coating with a thickness of 3~5μm.

8. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, Both diamond film coatings are formed by chemical vapor deposition; while the rhenium alloy particles are obtained by directly spraying them onto the surface of the outer diamond film coating during the formation of the outer diamond film coating.

9. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, The rhenium alloy particles are either Mo-Re-Hf-Zr alloy or Mo-Re-Hf-V alloy in the rhenium-molybdenum alloy category.

10. The milling cutter disc for aluminum alloy workpieces according to claim 1, characterized in that, When the distance between the plane corresponding to the lower surface of the second blade tooth and the cutting plane of the first blade tip is less than 200μm, the worn part is replaced.

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