Milling method of graphene aluminum-based composite material

[0017] The milling processing method of graphene-aluminum matrix composite material of the present invention adopts PCD milling cutter to process, and the rotating speed of described PCD milling cutter is 10000~18000r/min, and feed rate is 0.05~0.15mm/r, and cutting depth is 0.1 ~0.3mm, the radial circular runout, end surface circular runout and axial movement of the machine tool spindle are less than 0.02mm.

[0018] The PCD milling cutter is the existing cutter head made of polycrystalline diamond. Compared with the ultrafine tungsten steel milling cutter and the cubic boron carbide milling cutter, it has high hardness, high thermal conductivity, low thermal expansion coefficient, high The advantages of elastic modulus, low coefficient of friction and extremely sharp blades have been tested. During the processing of graphene-aluminum matrix composites, chips are not easy to stick to the tip of the blade to form built-up edge. When cutting workpieces for a long time The dimensional stability can be better controlled, and the tool wear is small, and the wear rate is small, which may be due to the small affinity between polycrystalline diamond and non-ferrous metals and non-metallic materials. In order to overcome the shortcomings of PCD milling cutters such as poor toughness, low bending strength, and inability to withstand large vibrations, the machine tools with radial runout, end face runout and axial runout of the main shaft less than 0.02mm are selected for processing, which can be greatly improved. Improve the stability of PCD milling cutter processing, and further improve the processing quality of products.

[0019] When the speed of the PCD milling cutter is less than 10000r/min, the workpiece is prone to delamination and splitting. According to the test, during the processing of graphene aluminum matrix composites, the speed of the PCD milling cutter is controlled at 10000-18000r/min , which can avoid delamination and splitting of the product while ensuring high processing efficiency, and the processing surface is smooth. According to different processing stages and processing conditions, the speed of PCD milling cutter can be adjusted appropriately. In addition, when using PCD milling cutters to process graphene-aluminum matrix composite workpieces, excessive cutting depth will increase the cutting force and generate more cutting heat, which will aggravate tool wear and directly affect the life of PCD milling cutters. Excessive depth can also easily lead to chipping of the PCD milling cutter. Under the premise of improving processing efficiency and high product precision, in order to prolong the service life of PCD milling cutters, it is appropriate to use a feed rate of 0.05-0.15mm/r and a cutting depth of 0.1-0.3mm.

[0020] The PCD milling cutter described above comprises at least one working face providing a cutting edge or cutting zone, and a matrix of cemented carbide. The matrix of cemented carbide is beneficial to reduce the cost of the tool to a certain extent and reduce the vibration of the tool during the cutting process. In practical applications, single-edge PCD milling cutters, PCD ball-end arc milling cutters, or PCD round-nose angle milling cutters can be used. Compared with multi-blade milling cutters, there is no difference in cutting angle and cutting height. The surface finish of the finished product is better. In order to avoid tool chatter during milling and achieve a higher material removal rate at the highest stable speed, the overhang length of the PCD milling cutter is preferably: the ratio of the overhang length to the tool diameter is not greater than 3. In addition, the ratio can be adjusted appropriately according to the strength of the tool base material and the processing conditions.

[0021] During the milling process of graphene-aluminum matrix composites, coolant can be supplied intermittently/continuously, which can not only reduce the generation of cutting heat, but also improve the smoothness of the product.

[0022] The above-mentioned milling processing method of the graphene-aluminum matrix composite material using a PCD milling cutter is illustrated below through the test methods shown in Tables 1-3.

[0023] Table 1:

[0024]

[0025] Form 2:

[0026]

[0027] Form 3:

[0028]

[0029] The above tests are carried out on the premise that the radial runout, end face runout and axial runout of the machine tool spindle are less than 0.02mm. The test results show that when the PCD milling cutter is used to process graphene aluminum matrix composites, under the premise of ensuring high processing efficiency, when the tool speed is 10000-18000r/min, the feed rate is 0.05-0.15mm/r, and the cutting depth When it is 0.1-0.3mm, compared with other process parameters, the processing efficiency, surface roughness, dimensional tolerance and flattening pass rate of the product can all reach the best level. The specific performance is that the surface roughness can reach Ra0.8, The dimensional tolerance can reach 5μm, and the product qualification rate can reach 95%.

[0030] The above-mentioned milling processing method can be further divided into rough machining, semi-finishing machining and finishing machining, so as to improve the processing efficiency of the product and improve the precision of the product. The sintered PCD milling cutter with good wear resistance is used for rough machining, and the tool particle size is relatively large. The preferred tool speed is 10000-12000r/min, and the cutting depth is 0.1-0.3mm; semi-finishing/finishing adopts Welded blade PCD milling cutter with higher strength, better toughness and good impact resistance, and fine grained cutter is preferred. Among them, for semi-finishing, the preferred tool speed is 12000-18000r/min, the cutting depth is 0.1-0.2mm, and the unilateral margin of the workpiece processing surface is 0.1-0.3mm; for finishing the workpiece to the required size, the preferred tool speed is 14000- 18000r/min, cutting depth 0.1~0.2mm.

[0031] The milling processing method of the above-mentioned graphene-aluminum-based composite material realizes low-cost, high-efficiency, and high-precision milling of the graphene-aluminum-based composite material by selecting a PCD milling cutter and reasonable processing parameters, so that the dimensional tolerance of the product It can reach 5μm, the surface roughness can reach Ra0.8, and the qualified rate of products can be increased to 95%.