With the cutting tool that machines at the mould

In process of your cutting tool selection, consider the machine tool function, milling craft that be aimed at, process designing, workpiece and cutting tool clip to support ability please. Develop as the abidance of milling craft and cutting tool technology, more and more die manufacturer borrow this to optimize machine treatment operation, shorten treatment metre and obtain outstanding mould surface surface roughness. But, the function of such as machine tool, milling technology that be aimed at, process designing, workpiece and cutting tool clip hold the ingredient such as ability is the essential component in process of cutting tool selection. In addition, likewise important is ability of tatty of analytic razor blade, have this capacity only, ability machines ground of the utmost in application to prolong cutting tool life in the mould accurate the use condition that forecasts cutting tool. Nowadays, to make full use of newest cutting cutting tool uses efficient milling technology, fast and efficient, function is powerful and the machine tool that has property of more outstanding process designing is very main. Tall feed milling and high speed milling are two kinds of popular milling craft, they need to use ability of type of specific cutting tool to undertake successfully machining. Milling craft high speed (or dynamic) milling craft becomes increasingly general now. When cutting tool of use whole hard alloy, this craft is particularly effective also. Method of this kind of milling is one kind optimizes rough machining method, in cutting steel when, it is OK will cut greatly measure union greatly to rise with relatively lesser radial clench the teeth. This craft still applies to treatment hardness to be the material of HRC 60 and above. Give milling treatment to Gao Jin, recommend use the big diameter that designs technically for it but dislocation cutting tool, in order to excise more material. Substantially, this craft is used first bigger but dislocation cutting tool undertakes rough machining, change when the mould is adjacent and finishing next with small diameter but knife of dislocation ball head and cutting tool of integral hard alloy have precision work. Appropriate cutting tool diameter depends on mould feature, for instance round horn radius. Tall feed but the diameter of dislocation cutting tool is not less than 15 Mm (0 normally.

62") . If need to use the cutting tool of smaller diameter, should use integral hard alloy to establish milling cutter. Gao Jin gives but the razor blade of dislocation cutting tool is OK as the change of workpiece material change, but film of use PVD of regulation of great majority application or CBN film razor blade. The chamfer to bit, triangular razor blade may have lower than circle or quadrate razor blade tool cutting edge angle. Low tool cutting edge angle can arise thinner cut bits, and this asks to use tall feed to lead ability to make then the chamfer of this razor blade ply cutting bits that keeps appropriate. Low tool cutting edge angle still conduces to lead cutting force along axial direction, in pushing its main shaft up, realize stabler, apter treatment operation on the machine tool thereby. If use taller tool cutting edge angle, can arise to cut bits thickly, bring about feed rate to adjust little. In addition, this still can cause bigger radial load, cause main shaft to bearing produces vibration and bear stress. The cutting tool of integral hard alloy that place of high speed milling uses is 4 blade square shoulder establishs milling cutter normally. This kind of cutting tool has long cutting blade and inside buy divides bits chamfer. The chamfer that divide bits can will cut bits to decide the small size that can accuse, improved the platoon bit of cutting area and machine tool consequently. Additional, cut completely when grow and dividing bits chamfer and high speed milling to cooperate, can promote productivity, prolong cutting tool life significantly, because cutting tool bear keeps stable from beginning to end. During tall feed is machined, cutting tool should move with quantity of complete diameter clench the teeth, but the half that should not be less than bit width. The cutting power that Gao Jin gives cutting tool to be able to guide machine tool main shaft effectively along axial direction and achieve a balance, because this is complete,amount of diametical clench the teeth can realize. Measure when cutting tool clench the teeth under bit width half when, will because cutting is lopsided and bear thrust and bigger vibration. To high speed milling, the cutting tool type that place of tall feed milling uses (but dislocation cutting tool and integral hard alloy establish milling cutter) likewise applicable. But, the chamfer of this kind of cutting tool must conduce to use high rotate speed and tall feed rate, the bear that cut bits waits in and want be being used and not be heavy load. Although grow dangerous in extending tall feed milling cutter to be able to process application in high speed efficient move, but their locomotive speed is inferior to short dangerous extend cutting tool, unless use,decrease tailor-madely brace up knife handle perhaps lowers cutting rate considerably. Should grow when hanging the treatment speed prep above that extends cutting tool to recommend, oscillatory meeting increases, create bit small collapse and premature be no longer in force. Nextpage razor blade wears away the analysis undertakes optimizing in the treatment operation to the mould when, the key is the use that utmost ground prolongs cutting tool life and can forecast cutting tool, reduce machine tool function in order to maintain the precision of the spare parts to drop. Mould workshop must understand all sorts of bit failure mode, check has used bit in order to decide invalidation germ. In bit check out procedure, the stereomicroscope can develop important assistance action, this kind of stereomicroscope has good optics characteristic, enough illume and at least 20 times magnifying power, it can identify bring about bit premature tatty failure mode. Have 8 kinds of common bit failure mode. Among them hind knife face wears away, the failure mode that small collapse of hot crack and point is attention of the need when using means of tall feed milling to machine a mould. But, improper razor blade is used to be able to be caused during treatment other 5 kinds of failure mode. 1.

Knife face wears away after general very even, it makes as treatment material the cutting blade of bit wears away or become blunt and appear gradually. When face of the knife after it is normal to identify wears away, meeting discovery forms along the cutting blade of bit relatively even grind mark. The metal that now and then can workpiece goes up is flyblown cutting blade, exaggerated razor blade wears the apparent size of mark. For slow down normal hind knife face wears away, important is the sheet of the hardest knife that uses won't small collapse qualitative grade, and use the lightest cutting blade will reduce cutting force and attrition. On the other hand, in cutting wear-resisting material, the precipitation after alloy of aluminium alloy of cutting nodular cast iron, silicon, high temperature, heat treatment is for instance sclerotic (copper alloy of PH) stainless steel, Beryllium and tungsten when hard alloy, regular meeting appears fast hind knife face wears away. Hind knife face is fast tatty evidence and wear away normally identical, wear away quickly to prevent, need uses wearability much better, hardness taller or the sheet of hard alloy knife that has film is qualitative grade. 2.

Crescent moon wears away depression is to diffuse wear away with abrasive the result of joint action. Workpiece cuts the quantity of heat in bits to be able to make the composition of hard alloy deliquescent in diffusing to cut bits, cause bit coping to produce crescent moon depression. Range of the knife after crescent moon can increase finally to make to enough depression occurs small collapse, be out of shape bring about possibly even fast hind knife face wears away. Although any common film can resist crescent moon is depression, but recommend use alumina film. 3.

When the fragment of workpiece arrives through thermocompression bonding knot on bit cutting blade, meeting generation accumulates bits tumour, this is endophilicity of chemistry of cutting area existence, high pressure and high temperature be caused by. The tumour that accumulate bits can fall off finally, fall off together along with bit fragment sometimes, bring about thereby small collapse and fast hind knife face wears away. The unusual change that accumulates bits tumour to be able to pass spare parts dimension or exterior surface roughness and cutting blade coping or hind the ablaze data that knife face appears will identify. Through increasing cutting speed and feed, use nitride (TiN) film razor blade and choose appliance to have the geometry that can reduce active force appearance and / or the razor blade of flowing surface can control the tumour that accumulate bits. 4.

Small collapse of bit cutting blade comes from mechanical function to be not stabilized, it is normally install clip, bearing by loose undesirable or main shaft wears away, treatment material has hard particle or interrupted cutting is caused. Ensure the machine tool is reasonable outfit clip, decrease as far as possible bend be out of shape, use abrade razor blade, control to accumulate bits tumour and the knife sheet with use tenacity better to pledge grade is mixed / or appearance of geometry of stronger cutting blade produces what can prevent small collapse. 5.

The heat of bit / mechanical invalidation is by acuteness temperature wave motion and mechanical concussion are caused jointly. Stress crackle can be formed along blade point, the hard alloy share that causes bit finally drops, be similar to small collapse a bit it seems that. Hot / mechanical invalidation evidence is to appear many perpendicular the crackle at cutting blade. It is particularly important that this failure mode identifies before small collapse begins. Heat up to prevent / mechanical invalidation, need uses cooling fluid correctly. If hope to this kind of invalidation is put an end to completely in machining craft, can use more impulse withstand material qualitative grade and medicinal powder hot chamfer. 6.

Point is out of shape is caused jointly by overmuch quantity of heat and mechanical load, mould treatment regular meeting appears this kind of circumstance. Below high speed and tall feed circumstance, or it is treatment hard steel, treatment when sclerotic surface and high temperature alloy, can produce much quantity of heat. This meeting causes the hard alloy in bit to stick receive a dose or cobaltic happening bate. Stick the content that receive a dose through using lower, more the bit material qualitative grade of wear-resisting, bit slot that drops treatment speed and feed to use small active force, can control point to be out of shape. 7.

Occurrence groove of area of bit cutting deepness and when cutting bits, groove wears away can become remarkable. Wear away to prevent occurrence groove, the change in needing to be machined in much journey is cut deep; Use the cutting tool that has bigger tool cutting edge angle; Cutting rate raises when machining high temperature alloy; Reduce feed; What add cutting deepness section carefully is abrade; Prevent to accumulate bits, when machining stainless steel and high temperature alloy especially. 8.

Active force of susceptive of place of bit cutting blade exceeds his when inherent strength, bit will produce machinery to rupture. Other 7 kinds of failure mode may bring about bit to rupture. Besides normal hind knife face wears away besides, produce machinery to rupture through correcting all and other failure mode to be able to avoid. Use more impulse withstand material chamfer of razor blade of stronger of qualitative grade, choice, use thicker bit, reduce feed and / or outfit of cutting deepness, test and verify places tigidity and examination to whether workpiece contains hard field trash or be cut hard, these are effective correct measure. Appearance of the material qualitative grade of cutting tool, geometry, material and manufacturer of tool of norms great majority can be aimed at specific treatment data develop qualitative grade of cutting tool material and geometrical form. In mould treatment, these material are P20 steel normally, CPMV 10 and pulverous metal. The key is the capable person with the specific data right choice that machines according to place qualitative grade and geometrical appearance, lest cutting tool is premature invalidation. Additional, match cutting tool to still can raise processability to be able to be mixed according to material choosing can forecast a gender, decrease thereby change a knife, discard as useless reach do poorly done work over again. If the hardness of material is HRC 52 or softer, cutting tool of common integral hard alloy can be competent. More expensive to hardness stuff, should make appliance has different geometry appearance and film (the nitrogen that designs for extremely hard data only for instance changes aluminous titanium) integral hard alloy establishs milling cutter. Additional, to cutting tool of integral hard alloy, different tool manufacturer still has special mixture film. To but dislocation cutting tool, the geometrical appearance of hard milling razor blade and film apply to the pulverous metal with treatment extremely strong great majority. Nowadays but dislocation cutting tool can provide different bit material qualitative grade and chamfer, can optimize the treatment of stronger pattern material consequently. Once defined the kind of cutting tool, must choose norms of appropriate radius of cutting tool round horn. Radius of cutting tool round horn must be less than radius of mould an internal angle. If cutting tool is round,the round horn radius of horny radius and mould comparatives, can appear " stop forcedly machine " , is not cutting tool carry round part smoothly. To finish machining, recommend the cutting tool of integral hard alloy with use smaller diameter. In addition, still can use cutting tool of current tall feed of integral hard alloy. Principle of this kind of radius also applies to rough machining, use round horn radius to be less than the cutting tool of workpiece radius namely. Although this meeting is in round part part to stay,have more stuff, but it conduces to the cutting tool negative charge that keeps stability, even for subsequently semifinishing machining and finish machining. Likewise as important as the round horn radius of cutting tool is the tigidity of cutting tool, and of cutting tool unplug modular rake / taper also is having crucial effect. Most cutting tool is shrink neck or awl neck. Shrink the diameter between the edge upper part of neck cutting tool and arbor diameter lower part is less than edge dimension. To awl neck cutting tool, it is cutting diameter above all, it is cutting diameter upper part is smaller next shrink neck area, it is outspread again a taper to arbor diameter. Great majority is long dangerous extend treatment cutting tool to all use design of cone-shaped knife neck. Unplug modular rake means cutting tool to need to have bigger tigidity lesserly. But the dip with need certain reservation chafes with avoiding cutting tool the sidewall of modular antrum. To choose the cutting tool with the biggest tigidity, must consider mould speech unplug modular rake. Cutting tool dip should not is equal to absolutely or be more than a mould to unplug modular rake. For instance, if modular antrum is all,parietal unplugs modular rake is 3 degrees, can use the biggest dip angle 2.

5 degrees cutting tool. Nextpage cooling fluid machines medium use in the mould to cooling fluid, the cutting tool design with current advanced great majority and geometrical appearance are doing type optimum behavior is achieved in treatment. Exceptional circumstance is oily mist refrigeration, but must use oily mist to undertake cooling all the time. To hard milling, in principle does not use any cooling fluid absolutely, unless have oil,mist can be used. Knife handle is held to cutting tool clip, company of most cutting tool can recommend those who be used at mould treatment and current and advanced cutting tool to decrease brace up knife handle. Best cutting tool deploys the knife handle of low function to will not realize first-rate to machine function and cutting tool life, and advanced high-powered knife handle can make cutting tool life turns over times however. Oscillatory control is crucial, especially cutting tool is longer in giving milling rough machining application with Gao Jin. The key is these are decreased brace up the harmonic that knife handle can reduce to arise by cutting craft and vibration. Cutting tool method and the method that process designing mould machines cutting tool should undertake optimizing through appropriate process designing, lest generate not actual demand to cutting tool. For instance, when machining a mould, if cutting tool method indicates part having a circle, must change treatment way in order to realize smooth transition, prevent to produce amount of clench the teeth of old point of view, avoid cutting tool overload thereby. A good way is the arc that the design is more than radius of cutting tool round horn. Accordingly, if use a diameter to be the cutting tool of 50 Mm (2") , criterion the round horn radius that the program should not encounter 25 Mm (1") , and should use a bigger flowing radius. Design appropriate arc to may have challenge sex, if the design is undeserved, can bring about cutting tool method unusual. At present package of much money software can help you devise the cutting tool way that this technology place wants well and truly. In addition, principle of understanding contact arc and knowledgeability programmer also can provide a help. The key is stop in what the machine tool avoids in cutting tool method and start a case. Change to any a bit halt to opportunity bed can produce quantity of heat and conduct heat cutting tool. Quantity of heat can destroy the cutting blade of cutting tool and film, because this must be in,cutting area eliminates the quantity of heat in cutting bits. Summary is passed understand current milling technology and cutting tool technology and skill of all sorts of failure mode and invalidation analysis better, die manufacturer can improve productivity, shorten treatment metre, prolong cutting tool life, maintain the function stability, precision that improves a spare parts and outward appearance, gain exceedingly good mould face surface roughness and reduce pair of facility wear away and loss. CNC Milling