Tungsten steel milling cutter is a cutting tool made of tungsten steel (hard alloy, also known as tungsten titanium alloy). Generally used for CNC machining centers, CNC engraving machines. It can also be installed on the ordinary milling machine to process some hard uncomplicated heat treatment materials, tungsten steel milling cutter is widely used, the use of high-speed processing. Tungsten steel milling cutter hardness of vickers 10K, second only to diamond. Because of this tungsten steel milling cutter has the characteristics of not easy to be worn, but also brittle hard not afraid of annealing.
Cemented carbide cutting tools (especially indexable cemented carbide cutting tools) are the leading products of numerical control processing tools, some countries have more than 90% turning tools, more than 55% of the milling tools are made of cemented carbide, and this trend is still increasing. Since the 1980s, the tool industry has continuously expanded the production of a variety of integral and indexable carbide tools or blades, its varieties have been extended to a variety of cutting tools, which indexable carbide tools from simple turning tools, face milling cutter expanded to a variety of precision, complex, forming tools. Carbide or manufacturing drill, face milling cutter and other commonly used materials. At the same time, reamer, end milling cutter, processing hard tooth surface, large module gear cutting tools, broach and other complex tools using cemented carbide is also increasing. The annual output value of carbide cutting tools and blades has accounted for more than 30% of the total output value of cutting tools.
According to grain size, cemented carbides can be divided into ordinary cemented carbides, fine cemented carbides and superfine cemented carbides. According to the main chemical composition, cemented carbides can be divided into tungsten carbide carbides and
titanium carbide carbides. Tungsten carbide-based cemented carbides include tungstellite (YG), tungstellite titanium (YT) and added rare carbide (YW). They have their own advantages and disadvantages, and their main components are tungsten carbide (WC), titanium carbide (Tic),
niobium carbide (NbC) and other commonly used metal bonding phase is Co. Titanium carbide carbide is a kind of cemented carbide with Tic as the main component and
molybdenum and
nickel as the common metal bonding phases.
They are standard and extended. Lengthening knives of the same diameter are generally more expensive than those of standard length. Cemented carbide milling cutter main points: integral cemented carbide milling cutter. Carbide slotting cutter with straight shank. Carbide saw blade milling cutter. Carbide auger milling cutter. Carbide machine reamer milling cutter.
The basic law of milling cutter wear is similar to turning cutter. The cutting thickness of high-speed tungsten steel milling cutter is small, especially in the reverse milling, the cutter teeth on the workpiece surface extrusion, sliding is more serious, so the milling cutter wear mainly occurs on the back surface. When milling steel parts with tungsten steel face milling cutter, because of high cutting speed, chip sliding speed along the front is large, so behind wear at the same time, there are smaller milling cutter wear in front.
Tungsten steel face milling cutter for high-speed discontinuous cutting, so that the cutter teeth undergo repeated mechanical impact and thermal impact, crack and cause fatigue damage of the cutter teeth. The higher the milling speed, the earlier and more serious the cutter wear. Most tungsten face milling cutters lose their cutting ability due to fatigue damage. If the milling cutter geometric Angle is not reasonable or improper use, the strength of the cutter teeth is poor, then the cutter teeth under a lot of impact force, will produce no crack of the milling cutter wear.
In reverse milling (also known as reverse milling), the feed direction of the workpiece is opposite to the rotation direction of the cutter in the cutting area. Chip thickness starts at zero and increases as the cutting process progresses.
Tungsten steel milling cutter in reverse milling, tungsten steel milling cutter blade cutting from zero chip thickness, which produces high cutting force, thus pushing tungsten steel milling cutter and workpiece away from each other. The tungsten steel cutter blade is forced into the cut, usually in contact with the machined hardened surface caused by the cutting blade, and at the same time under the action of friction and high temperature friction and polishing effect. The cutting force also makes it easier to lift the workpiece off the work table.
Tungsten steel milling cutter in down milling, tungsten steel milling cutter blade from the maximum chip thickness at the beginning of the cutting. This can avoid the polishing effect by reducing the heat and the tendency of machining hardening. It is advantageous to apply the maximum chip thickness, and the cutting force is easier to push the workpiece into the tungsten cutter for the cutting action of the tungsten cutter blade.
During milling of tungsten steel cutters, chips are sometimes bonded or welded to the cutting edge and tend to gather around the start of the next cutting edge. In reverse milling, chip breaks are easily trapped or wedged between the blade and the workpiece, resulting in blade breakage. In down milling, the same chip breaks in two so that the cutting edge is not damaged. Regardless of the requirements of machine tools, fixtures and workpieces, on-milling is the preferred method.
Because the cutting force is easy to push the blade forward while keeping the workpiece down, the down milling has certain special requirements for the machining process. This requires machine tools by eliminating the backlash to deal with the table feed requirements. If the tool is pushed into the workpiece, the feed will increase irregularly, resulting in excessive chip thickness and will cause the edge to break. Reverse milling should be chosen for such applications. In addition, if there is a large change in processing allowance, at this time the choice of reverse milling is more favorable. Proper clamps are required to clamp workpieces properly, as well as correct tool sizes for work. But for the vibration trend, the direction of cutting force is more important.
