Nowadays, hard-to-process materials are more and more widely used in all walks of life.Especially in complex working conditions and materials with relatively high requirements, due to high pressure, high temperature, adequate corrosion resistance and Anti-deformation properties, difficult to process materials is very suitable.With the promotion of the application of difficult to process materials, a variety of new hard-to-machine materials are also continuously put into industrial applications to meet the different needs of their performance requirements of different materials such materials, High temperature alloys such as Inconel 718, Rena 80, titanium alloys such as Ti6Al4V, Ti5553, precipitation hardened stainless steels such as PH17-4, PH15-5 and the like.
First, difficult to process material characteristics
1. High intensity
In general, difficult to machine materials, high strength means cutting force is relatively large, so the role of the cutting tool on the load is relatively large, thus affecting the tool life, and the stability of the process, especially at high temperature conditions, Compared with steel, the strength of difficult-to-machine materials may be several times higher than that of ordinary steel under high temperature conditions, thus requiring a series of requirements such as stiffer and more torque-intensive machine tools, robust clamps, and cutting tools with sufficient strength at high temperatures.
2, poor thermal conductivity
Difficult to process materials, the thermal conductivity is generally low, low thermal conductivity means that a large number of cutting heat can not be scattered through the scrap iron or parts, but a large number of cutting heat accumulation in the tool, thus accelerating wear and tear reduce the life of the tool. In addition the cutting temperature is high , Will also affect the machine tool spindle accuracy.
3 work hardening
Metallic materials generally have work hardening or cold work hardening, but the problem is more difficult to process materials.If the processing tools and processing strategies to choose an unreasonable will lead to more parts harder and harder, and ultimately unable to complete the processing.
4. Chip breaking
Material chip breaking is particularly important for the quality of machined tools and parts, but difficult-to-machine materials are often not easily chip breaking, therefore easily leading to secondary cutting of chips, and chip secondary cutting is fatal to the life of the blade, The chips are hard and brittle, harder than raw materials.
5. Chemical wear
The difficult to machine materials often contain more alloying elements, especially active alloying elements, so under high temperature and high pressure conditions, the material and the tool alloy elements will be a chemical reaction, easy to form built-edge tumor, to further accelerate tool wear.
In short, the machining efficiency and tool life can not be expected in the machining of such materials, and the cutting condition can not reach the level of conventional ordinary steel.
Second, the mountain difficult processing materials solutions
1. Jetstream Tooling® Duo twin flywheel product family
The Seco Jetstream Tooling® Duo product line is designed for the turning of difficult-to-machine materials. The Jet-stream dual-flow cutting tool is designed to reduce the effects of low thermal conductivity, constant chip breaking, chemical wear and built-in edge wear, High-pressure water jet technology.As the coolant outlet from the cutting point of the distance closer than the traditional casting cooling cooling effect is better, can effectively reduce the heat transfer of cutting tools.Coolant with high pressure, pressure loss is small, under the action of high pressure Chip easily broken; cutting temperature decreases, the trend of chemical wear weakened.
2. MS2050 material
The MS2050 material is suitable for milling difficult-to-cut materials. The MS2050 milling inserts are made of NbN (silver-gray) with a NbN coating thickness of 3 μm and can effectively avoid chemical reactions with titanium alloys at elevated temperatures. Its heat-resistant abrasion resistance. The optimized matrix with better toughness allows higher cutting parameters to be used in titanium alloy processing. It is mainly used in titanium alloy, superalloy and austenitic stainless steel workpiece materials. Processing material processing in the field of outstanding performance.
In fact, the key issue of cutting difficult-to-machine materials is cutting heat and strength issues, so the basic shape of the blade should be strong enough, the cutting edge is moderately sharp when choosing a tool, the fast feed tool is a good choice, fast feed tool The main declination is relatively small, the blade base is relatively strong, suitable for processing high strength materials, and its cutting mainly by the axial force, is conducive to cutting process stability.In addition, fast feed tool feed speed is conducive to reducing Work hardening trend. Seco tools have a wealth of product lines that can meet the processing requirements of a variety of different conditions.
3. Solid carbide drill Feedmax M slot
In addition to this, there is a Feedmax M slotted solid carbide drill developed specifically for difficult-to-machine hole machining, featuring: Increasing drill bit back taper to prevent bit wall rebound causing bit jamming; Reducing ligament width and reducing Bit and hole wall friction.With the gradual change of the angle, the drill bit part of the bit after the increase of bit angle to improve the edge sharpness, higher feed per revolution can be used. Chisel processing to reduce the chisel length, reduce the right Extruding and work hardening of hard-to-machine materials The cutting edge is specially ground for higher strength.