Friction and Wear Properties of Tungsten Carbide Cutting Tools

In each tungsten carbide cutting tool friction processes follow a similar law, namely the initial dynamic friction coefficient have experienced a rapid increase in the transition period from the initial value, and then remained relatively stable and fluctuated in a stable phase characteristics. Initially, under normal loading, the friction surface is only partially asperity contact, a smaller adhesive area, the contact surface of the molecular attraction is small, the friction coefficient is small; as rubbing process, interfere asperity gradually being polished, adhesion area increases, the molecular attraction also increases, resulting in friction coefficient increases. The whole process is the carbide friction contact surface mount constantly, then they continue to cut under shear stress process. Since the surface of Co phase peeling, crushing the sample surface caused by wear, local surface adhesion soon reach a dynamic equilibrium, causing the friction coefficient of the surface is maintained in a more stable range, called the stationary phase.

Nano Tungsten Carbide Cutting Tool Al / SiCp Composite Material Mechanism

Tungsten carbide cutting tool AlSiCp nano composite material is divided into mechanism of tool wear mechanism analysis, a composite material removal mechanism and cutting parameters influence on tool wear three parts. Because of Al / SiCp SiC particulate material hardness (microhardness HV = 27GPa) higher than tungsten carbide (YG class tool material microhardness HV = 16 ~ 18GPa, nano-carbide WC-7Co microhardness HV = 22GPa), therefore, with tungsten carbide cutting tool Al / SiCp composites quickly when worn or damaged. Before and after the cutting tool flank and observed daily post-processing, there is found to the rake face bright visible white band can be seen under the microscope parallel to the flow direction of the chip grooves, since the chip contains a lot of SiC particles, in before flowing along the flank when the chips, the chip on the bottom of the SiC particles generated rake micro-cutting role in the formation of the grooves.

Tungsten Carbide Cutting Tools for Drilling and Cutting Fluid Chip Control

Drilling swarf control and tungsten carbide tool cutting fluid is drilling in the key. Generate the appropriate shape and size as well as drilling cuttings exclude them for any drilling processes are essential. In this case, if no satisfactory performance due to any tungsten carbide cutting tool for drilling the drill cuttings will be stuck in the hole cutting is stopped in a short time. Modern drill high cutting speed and high feed are available through the use of cutting fluid becomes possible when effective chip evacuation. Tungsten carbide cutting tool during the drilling fluid is for use in a metal cutting, grinding process used to cool and lubricate the tool and the workpiece industrial fluids, cutting fluid is a combination of the super-functional additives Science composite compatibility made.

Drilling Technology of Tungsten Carbide Cutting Tool

Tungsten carbide cutting tool drilling process is closely related with subsequent processing, such as sleeve holes, reaming and boring. These same points of tungsten carbide cutting tools for drilling process is rotating the main motion and linear feed movement combined. Sleeve hole is mainly used for large-diameter holes, unlike the entity that consumes a lot of power drilling. Sets of holes drilled across the diameter of the hole is not drilling, but drilling a ring on the circumference of the hole. It is not all materials are removed in the form of chips, but leaving a core around the center, therefore, the main thoroughfare such that the drilling process is the application of the through-hole; reaming tool is dedicated to expand the existing hole, it species around the hole drilling process is cutting out a lot of metal; reaming is already finishing hole. This drilling process will remove a small allowance, so as to achieve better surface quality and small tolerances.

Tungsten Carbide Cutting Tools Cutting Parameters

Tungsten carbide cutting tool, said cutting the amount of the main movement and feed exercise, cutting the amount of tungsten carbide cutting tools is the feed back of tungsten carbide cutting tools and knives to eat the amount (depth of cut), cutting cutting cutting process movement speed, in general. For process parameter adjustment of the machine. Cutting exercise is the main sport and the feed motion synthesis movement. Cutting means cutting edge point of the instantaneous velocity relative to the workpiece selected synthetic cutting movement. Calculated as the cutting speed Vc = πdn / 1000 = dn / 318, Vc is the cutting edge of the instantaneous velocity of the selected point relative to the main movement of the workpiece, in units of m / s or m / min. n units of r / min, said cemented carbide cutting tool of the workpiece rotational speed; d in units of mm, pieces of cemented carbide cutting tool showing the rotational diameter of the selected point.

Tungsten Carbide Cutting Tool Cutting Layer Parameters - Part 2

Tungsten carbide cutting tool cutting layer cross-sectional area AD: cutting layer called the nominal cross-sectional area, which is the size of the plane where the cutting layer cross-sectional area measurements.

Tungsten carbide cutting tool cutting thickness BD: The full name of cutting the nominal thickness, it is cutting the size of the layer surface perpendicular to the transitional measure.

Tungsten carbide cutting tool cutting layer width HD: Cutting called the nominal width, which is measured parallel to the cutting surface of the transition layer of size.

Cutting layer thickness and the width of the cutting angle with the main changes in the size. When the main angle equal to 90 °, cutting layer width equal amount of feed, cutting thickness equal to the depth of cut. Cutting layer cross-sectional area only cutting the amount of cutting depth, feed-related, from the main angle of impact. But the shape of the cross section of the cutting layer and the main angle, nose radius size. With the decrease of the main angle of the cutting thickness will be reduced, while cutting width will increase.

Composition of Tungsten Carbide Cutting Tool Cutting Part

Flank, the cutting edge constitutes a cutting portion of tungsten carbide cutting tools. Flank into rake, flank and vice flank. The rake tungsten carbide cutting tool is the chip flow through the surface; flank surface is the surface opposite to the transition; flanks is the surface opposite to the machined surface. Carbide cutting part of the tool between entities included in the front and back of a knife, said wedge. Divided into the main cutting edge of the cutting edge of the cutting edge and to pay two kinds. The main cutting edge is the front edge and the rear Concurrent secondary cutting edge is the cutting edge in addition to the main cutting edge.

Tungsten Carbide Cutting Tool Angle Reference System

Important parameters tungsten carbide cutting tool cutting part geometry is based on carbide cutting tool angle determined. Reference coordinate system refers to the respective reference plane tungsten carbide cutting tools are used to define the angle. Reference system into the tool and the tool stationary reference frame work of reference types. Tool stationary reference frame is a reference tool designed labeling, grinding and measuring, with the tool angle defined by said tool mark this angle; work of reference is a reference tool to determine the angle of the cutting tool to work with the tool angle, said this definition tool working angle.

Three Kinds of Tungsten Carbide Cutting Tools Cutting Mode

Tungsten carbide cutting tool cutting methods are non-free free-cutting and cutting and cutting orthogonal (at right angles to the cutting) and non-orthogonal cutting (bevel cutting) and three methods of the actual rake angle.

First, freedom and non-freedom cutting cutting: free-cutting is one of the main cutting edge participate in cutting, rather the contrary, the primary and secondary cutting edge while cutting is called to participate in non-free cutting. When free-cutting cutting deformation process is relatively simple, it is a pilot study of cutting commonly used method. The actual cutting is usually non-free cutting.

The second, orthogonal cutting (right angle cutting) and non-orthogonal cutting (bevel cutting): Right-angle cutting edge is perpendicular to the direction of cutting, and said the oblique cutting is not perpendicular to the cutting edge of the cutting direction cutting. Therefore, the blade knives are not equal to zero inclination angle cutting mode. Bevel cutting with a sharp edge, chip brisk, and many other features.

Third, the actual rake angle: rake angle of the cutting process actually works, said the actual rake angle, which is the angle between the plane of the front surface of the base containing the chip flow direction and perpendicular to the basal plane of the measurement. When oblique cutting chip flow direction have a greater deflection, the actual rake angle increases significantly.

Use Angle Tungsten Carbide Cutting Tools

Tungsten carbide cutting tool surface expression of the spatial orientation of the parameters, namely tungsten carbide cutting tool angle. Tungsten carbide cutting tool angle There are four types: the rake angle, clearance angle, angle and blade angle. Orthogonal planes of reference tool rake angle is the angle in front of the base surface correction cross angle between the plane and asked measured; orthogonal planes of reference tool angle after angle is corrected in the back with a cross-cutting between measured Plane folder angle; orthogonal planes of reference tool angle refers to the angle between the main plane of the base surface of the main cutting measure and assuming that the work plane angle; while orthogonal planes of reference tool angle of inclination refers to the cutting edge plane measured between the base surface and the angle of the cutting edge.

Tungsten carbide cutting tool angle of plus or minus provisions: When the front of the base surface parallel to the rake angle is zero. When the cutting plane between the front angle of less than 90 °, the rake angle is positive, is greater than 90 °, the rake angle is negative. Time is less than the angle between the base surface and the back 90 °, the angle is positive and greater than 90 °, the angle is negative.

Tungsten Carbide Cutting Tool Life

Tungsten carbide tool wear at the time of the cutting tool by the work under high temperature conditions, the friction of the chip, so that the phenomenon of the tool material is gradually wear or breakage occurs. Tungsten carbide tool wear also means life, so to find out the cause of tool wear, prevent premature, excessive tool wear and how to extend tool life, which is affecting productivity, processing costs and processing quality is a key factor. Factors affecting the tungsten carbide cutting tool life there, feed, tool geometry parameters, factors such as workpiece material and tool material.

The Role of Tungsten Carbide Cutting Tools Cutting Fluid

Tungsten carbide cutting tool cutting fluid has a cooling effect, lubrication, chip removal and washing effect and anti-rust, tungsten carbide tool cutting fluid can effectively reduce the cutting force, reduce the cutting temperature, reducing processing system thermal distortion, extended tool life and improve the quality of the machined surface. Selection of high-performance cutting fluid is also an important measure to improve the cutting of difficult materials. Cutting fluid should have anti-foaming, anti-mildew qualitative no pollution, no deterioration odor emissions environment, nontoxic to humans and the use of economic and other requirements.

Tungsten Carbide Cutting Tool Basic Rules of Procedure

Tungsten carbide cutting tool cutting process is through cutting exercise, like cut fruit to eat the rind cut off as cemented carbide cutting tools from excess metal layer formed on the workpiece cut chips and machined surfaces, this process of carbide cutting tools deformation, the formation of the chip, resulting in cutting force, cutting heat and cutting temperature, cutting tool wear, and many other phenomena. If the cut off peel back the original fruit roll back on, or you can fight together in accordance with the original look. However, carbide cutting tools cutting metal, especially in the continuous cutting of steel, the chip will not be as it is rolled up. Not because the chip is too hard, but because of the length of the chip will produce change's sake.

Chip shape under different cutting elements are also different. The thickness of the chip is several times the original, and a fraction of the length of the chip original. So, with a cutting speed obtained by cutting the chip, the chip is equivalent to a fraction of the cutting speed is produced.

After forming the shape of chips based on different shear slip cutting tools, chip into ribbon cuttings, festival-like chips, granular chip, chipping four types of chips.

Tungsten Carbide Cutting Tools Used in The Automotive Industry

Tungsten carbide cutting tool widely used in the automotive industry, ductile iron tungsten carbide cutting tools is one example. This is because the cast iron has high rigidity and compressive strength characteristics, and can be cast into a complex shape so that the material has been used for the transportation industry and other major parts of the engine casing, wherein the overall performance and quality of the intensity ratio of nodular gray cast iron is widely used in auto parts good material. And other high-strength low-density materials, the processing characteristics of ductile iron having a hard, with the improvement of the pearlite content, the better the wear resistance, workability worse, ductile porous thereby reducing the causes intermittent cutting hard alloy tool life.