Heat treatment is rise and assure one of mechanical product quality and dependability, main bases that enhance competition ability of manufacturing industry market, the discretion of its industry standard is having decisive effect to manufacturing industry development. Current, the heat treatment industry of our country besides a few manufacturer, overall level is far the more intense market competition environment that cannot get used to industry of the heat treatment after joining WTO to be faced with. In this among them, the heat treatment of our country detects equipment is more backward. Serious limitation and block up the development of engineering technology and those who cause product quality is not stable, more important is cannot prevent a product effectively to appear needless quality accident. Below my most commonly used after heat treatment of pattern of mechanical spare parts, industry hardness test comes citing. Hardness is to measure metallic stuff soft a good target, hardness is worth the physical quantity that is not an unit actually, it is token is worn the target of a kind of integral performance that a series of different physical quantity such as He Ren sex set rate of the flexibility of material, plasticity, deformation, aggrandizement, intensity, can think hardness is to point to a metal commonly apparently the resistance inside not large volume is out of shape cracked ability. Use portable li of economic value that family name sclerometer has hardness detects depend on need not destroying workpiece and but spare parts of whole lot inspection, already made the product quality inspection, important test that makes sound technology and analytic product quality one of methods. Structural member and mould detect use a case actually one, use li of family name sclerometer to check hardness to come craft of pretreatment of large tine axis, ring gear reachs analysis, test and verify cementite quenchs the method of craft: 1, layer of cementite of axis of the tine after the quality after this craft checking to operate after pretreatment craft affects cementite craft to operate directly, ring gear the deflection of ministry of the uniformity of hardness profile, tine. The intensity that more important is core ministry (not ooze layer) . Of the tine department that should use li of family name sclerometer to check tine axis and petiole, ring gear outside round internal diameter and end panel, if discover the same area hardness of the test is highest the discrepancy with lowest is bigger, below the premise condition with examining way of refrigeration of the appearance furnace temperature, means that install furnace, craft normal, can be worth on any account to need value and the situation that distributing according to hardness, conclude give the organization inside workpiece to existing to slant analyse or banded structure. What show like metallographic picture is banding slant because analyse uses hardness method the what is actually happening of the test is test site hardness on the high side is taken in black pearlite, hardness on the low side is taken in white ferrite. Blemish of this kind of organization quenchs be impossible to eliminate in technology operation in subsequently cementite, be come down by reservation however. Once large tine axis, ring gear is put in this kind to organize blemish, can create the problem with brief service life not only when outfit machine is used, and often cause major equipment accident. There is this to plant in giving forging through checking hardness law to be able to conclude when us banding slant after analyse, use solution treatment craft to operate instantly or other eliminate banding slant the craft of analyse can eliminate flaw, the happening that prevents equipment accident thereby, reduce a loss. 2, the technology of final heat treatment that axis of tine of this craft family name and ring gear test after cementite craft, examine normally personnel checks HRC hardness to dissection again next to sample only sample does metallographic to analyse: Level of ooze layer martensite, carbide level, configuration distributings, leftover austenite measures level of martensite of configuration, core, reoccupy is microscopical layer of sclerometer test ooze is operation of deep-seated deepness above to regard as to HV550 hardness from surface layer eventually check. But from axis of spot happening tine early failure breaks an axis, age the ministry discovers in analysis of serious tatty accident, the hardness of objective the hardness under sample, often appear when deep-seated cementite especially, the reason is objective tine axis, ring gear and sample are not the same as an intercept on makings to come down, also not be the pretreatment that same furnace place does. Such primitive before objective and sample ooze organizations are different, the organization after ooze and hardness have certain difference, mainer is to be in operation of whole cementite technology, as a result of workpiece put reach cementite surface to accumulate vast difference (the photograph interface that thermo-chemical treatment recruits a process has an infiltration medium in reaction and main factor size of area of figure of the chroma of each constituent and workpiece surface condition, face, watch and surface, but the faster and exact cause that finds out generation quality problem. Together with makes necessary craft adjust, can eliminate accident hidden danger before workpiece is assembled. 2, use li of family name sclerometer to check hardness to come in analysis, test and verify craft of mould of large and complex structure this is a feed pattern that makes with martensite stainless steel, basically use at producing feed. There are 10000 ～ on the mould 27000 aperture, the mixed feed that has 10 tons hourly is farinaceous content is squeezed from modular aperture area piece become grain state. So the crucial reference point of annulus model quality and service life is the hardness of area of aperture of annulus model upper mould and ooze layer. It is picture of objective of modular aperture tatty below: Because mould size is large, and modular aperture distributings on outer circle, checking a place is a curved surface, the span between Kong Yukong has 3 ～ 4mm commonly, the diversiform applicability that developed li of family name sclerometer in the as it happens below this kind of condition and cabinet carry convenient characteristic, can check aperture giving a model well and truly to be in actual hardness. According to the hardness of actual measurement and the metallographic analysis that make to test block place, but more reasonable correction and make technology, develop data latent capacity adequately, improve service life. If annulus model gives 10 tons of feed one hour, should lengthen 10 hours of service life to be able to give 100 tons of feed, can bring enormous economic benefits to the enterprise. 3, analysis of industry pattern invalidation is medium the action material of li of family name sclerometer pledges forging die of 5CrMnMo large heat has in use constant because model antrum is inchoate wear away, cave in and invalidation. Should use li of family name sclerometer the hardness that grinding discovers when to wearing away the area checks hardness is worth the hardness under the test before was not being used (38 ～ 42HRC) is in limits of 32 ～ 34HRC. This shows the semifinished product in red heat (> 10000C) is right model the 2nd phase that antrum heats (semifinished product is in model antrum heats to be able to be divided roughly for 4 phase) , be heated quantity is in about 80% ～ 85% when, because modular antrum wall is large,come loose heat is slow, the certain temperature that select an area is as high as 6500C above. Exceed mould temper temperature because of conducting the temperature after be heated when mould antrum, the mould is to lie in working process continue temper process phase, the change that continues to produce organization and property, caused wear away area hardness is worth reduce and produce heat to wear away, show 5CrMnMo heats up mould steel this kind unsuited make large pattern. The heat that should choose service of to be taken orally of lukewarm area of 600 ～ 6500C makes a mould be like 3Cr2W8V, 3Cr3Mo3VNb is this kind of thermal stability, hot strong sex, succumb the heat of intensity makes mould steel more appropriate than using 5CrMnMo. In China this industrialized process is returned far below the condition that did not complete, urgent need shortens hard the difference of as advanced as international production level, serve as an enterprise to must realise heat treatment industry from strategic height, not only from equipment, craft, detect especially equipment is badly in need of wanting to absorb domestic and international new technology ceaselessly, should treat the condition that actual in heat treatment enterprise production uses more. This ability is a very well-advised act, because joining WTO hind to have by world trade regulation 5 years,transfer period, to our country manufacturing industry character, this is a very crucial period, saying is crucial because transfer,be period hind enterprise of our country manufacturing industry basically will be in foreign big company coequal competition position, and transfer in this period in, we are passable and sufficient preparation promotes competition ability, so this is very pressing to the enterprise requirement. CNC Milling