Vacuum heat treatment applies mediumly in tool of hard alloy cutting and die

Summary: Studied the effect of vacuum heat treatment to hard alloy function, integral Jiang Ren all gets change after hard alloy razor blade and die heat treatment, especially Bb of bending strength σ rises apparently. Experiment through production, can twice improves service life. Keyword: Hard alloy; Vacuum heat treatment; Jiang Ren is changed; The industry pattern material that 1 introductive hard alloy regards bending strength as the industry such as mechanical, mine, electron, standard component, although have tall hardness, wear-resisting, anti-corrosive function of fine waiting for actor, but be collected in mine getting and in the use of metallic cutting cutting tool, exist generally because tenacity difference brings about serious collapse blade fragile break and inchoate grind loss effect two catastrophe problem, restricted its scope of application, special in the circumstance that gets concussion load, if mine drilling, geology is drilled, in the industry pattern material such as cold strong cold forging, thick mill, ask not only tall hardness, wear-resisting, it is good to return need whole obdurability importantly. Come nearly ten years, we made the research that compares a system to hard alloy heat treatment. 80 time end, development goes new generation mine to use hard metal, already got applied extensively [1] , gained remarkable economic benefits and social benefit. Use a field with what develop heat treatment hard alloy to widen further, form seriation of heat treatment hard alloy, it is the way that will study henceforth. The vacuum heat treatment that hard metal uses to milling and die mainly here undertook study, achieve clear result. 2 experiments method 2.

Before means of 1 heat treatment, means of hard alloy heat treatment is the heat treatment of imitated rolled steel, it is namely after agglomeration of hard alloy goods, undertake 2 times warming up quenching again, next temper. Now we replace it with a kind of new heat treatment way, this kind of means is agglomeration quench, namely after product agglomeration, do not come along with furnace refrigeration room temperature, quench directly in firing temperature or the temperature with cool constant however, discharge 2 times warm up process, when achieving a province thereby, save labour, reduce specific power consumption and the goal that improve efficiency. 2.

This experiment makes up 2 raw material and alloy brand hard alloy of two kinds of series: ① mould series: YG15C, YG20C; ② milling series: YG6, YG8, YS30, YT14, YT5, YW2. Still made up make experiment of certain condition contrast use alloy of YG6C, YG8C, YG15. Make up above alloy place to use WC, (TiW) C and Co pink all are taken from individual plant continent hard alloy factory. 2.

Burden of hard alloy of 3 tests equipment mixes till dewax all uses convention to produce equipment,reach suppress, agglomeration quenchs in WZS-20 model quench undertake in amphibious furnace with WZS-45 vacuum agglomeration. In WZS-20 furnace art of charge for the making of sth. experiments, undertake in WZS-45 furnace industry produces application. Two vacuum furnace all achievable vacuum agglomeration, vacuum quenchs, air cooling quenchs wait for a variety of craft. Quench the whole process of craft can be pressed beforehand given the process undertakes automatically, still but the hand moves an operation. Convention of 3 experiments content detects the standard sample that the project uses is sample of bending strength of 30mm of × of 5mm × 5mm, test alloy density, hardness and correct dense power with A116 razor blade. The sample that has squelched, after classics dewax, do the following test. 3.

The contrast of means of two kinds of 1 heat treatment parted to undertake to YG15C and YT14 alloy agglomeration hind warms up 2 times direct temper by dipping in water is oily after oil oil and agglomeration, contrast of means of two kinds of heat treatment experiments. In means of two kinds of heat treatment, each take craft of an effect first-rate to be opposite alloy of YG6, YG8, YG11C, YG15C, YG20C, YS30, YT14, YT5, YW2 undertakes handling, after test result all is classics temper detect finally result, see a picture 1 (bending strength increment is the opposite increment that contrasts with agglomeration condition, each graph all is the same as under) . From the graph 1 visible, immediate heat treatment is feasible, handle WC- with this method (TiW) C-Co alloy excel rises tepid processing 2 times. Graph brand of 1 each alloy result of test of contrast of means of two kinds of heat treatment 1.

Agglomeration hind is direct oily temper by dipping in water 2.

Agglomeration hind warms up 2 times oily temper by dipping in water 3.

2 different quench vacuum of medium experiment hard alloy quenchs use oily oil amiable temper by dipping in water. Gas oil chooses nitrogen, contrast economy. Graph 2, graph the 3 effects after for classics of alloy of YG8, YW2 different medium quenchs. Graph alloy of 2 　 YG8 quenchs via different medium the bending strength after increment 1.

　 of oily temper by dipping in water 2.

The graph that enrage temper by dipping in water alloy of 3 　 YW2 quenchs via different medium the bending strength after increment 1.

　 of oily temper by dipping in water 2.

Gas oil from the graph direct oil oil compares alloy of 2 visible YG8 increment of the direct bending strength that enrage temper by dipping in water is apparent, and from the graph 3 visible, temper by dipping in water of YW2 alloy straight coherent compares direct oil bending strength adds oil apparent. Accordingly, the alloy of different name should be used quench differently medium, the alloy that differs namely, the requirement quenchs differently cooling rate, in order to make the W in alloy, C is in the martensite change of the deliquescent quantity of cobaltic photograph and cobaltic photograph and the thermal stress that as a result of alloy different place causes the hot coefficient of expansion of each constituent achieve optimal combination. 3.

The contrast of alloy of 3 different cobaltic content pursues the comparison of the bending strength after the 4 alloy heat treatment that are different cobaltic content. Graph 4 make clear, what the maximum of the alloy bending strength after heat treatment follows content of the cobalt in alloy is elevatory and elevatory, the mechanism photograph that this and heat treatment make cobaltic strong pliable but strong is changed is consistent, and as cobaltic content elevatory, correspondence of peak value of alloy bending strength is taller optimal quench temperature (Tq) . Because cobaltic content increases,the trend with elevatory Tq is, flabby ability heightens the strain of alloy, make martensite of the deliquescent quantity of W, C in cobaltic photograph, cobaltic photograph changes thereby the optimal combination temperature that reachs thermal stress is elevatory. Graph effect of heat treatment of alloy of 4 different cobaltic content is compared 1.

YG15C 　 2.

YG11C 　 3.

YG6C 　 4.

YG83.

4 quench agglomeration of vacuum of temperature hard alloy quenchs craft, in heat treatment means, after quenching medium decides, quench the choice of temperature is crucial. See from afore-mentioned experiments, alloy name is different, optimal quench temperature (Tq) different also. Tq basically depends on the composition of alloy (if pursue 4) , increase as cobaltic content, tq tends elevatory, decide Tq finally through experimenting repeatedly. 3.

The choice of 5 temper temperature because horniness photograph (WC) differ with the coefficient of expansion of felt photograph Co about 3 times, the alloy interior after reason quenchs is put in stress, this kind of stress may bring about alloy to produce choose temper temperature (Tt) main consideration at 2 o'clock, it is the stress that eliminates alloy as far as possible, it is to make the separate out of cobaltic photograph falls additionally lowest. Accordingly, temper temperature should be the temperature that chooses both all beautiful. In microtherm phase temper, lift as Tt, bending strength increases. At this moment if an a house where a fire started wants to eliminate stress process, and Co photograph precipitate is very few. According to principle of aggrandizement of Co photograph separate out, minim Co precipitate brings about dispersion aggrandizement. But lift as Tt continuity, grow in quantity of Co photograph precipitate, force of alloy correct dense mushroom, separate out child is brittleness photograph like Co3W3C, Co7W6, Co3W, Co7W2, make alloy organization structure worsens badly, reason makes bending strength drops quickly. Accordingly, alloy of the cobalt in be being mixed to low cobalt, tt should choose a few taller, tt of tall cobaltic alloy should choose inferior. If the graph is shown 5 times, time of YG15 alloy temper is between 4 ～ 30h, bending strength, hardness and correct dense force change not quite, accordingly, lengthen temper time meaning not quite. Graph the influence of 5 temper time to YG15 alloy function (it is with agglomeration condition fiducial) 4 production experiment 4.

1 cutting cutting tool produces an experiment to make clear, its function is apparent after the heat treatment of classics of hard alloy razor blade of all brands excel agglomeration condition, its service life times add, see the watch is shown 1 times. Its wearability, tenacity and service life improve the heat treatment bit that like Beijing internal-combustion engine the factory experiments apparently. The field work personnel of all experiment unit reflects bit of hard alloy heat treatment than not the razor blade of heat treatment is bright and clean degree tall, durability is good, service life is long. Express model of standards of state of alloy of brand of alloy of manufacturer of result of test of milling of spot of razor blade of 1 hard alloy to machine dosage of cutting of material work name treatment of M of μ of surface roughness ／ measures ／ or time  life rises (times) Ar ／ cuts feed of ／ of rotate speed N R of deep Ap ／ .

Min - 1mm.

R - 1mm Beijing internal-combustion engine total factory 41605114160511416051145 steel move heat treatment of heat treatment of condition of agglomeration of YS30 of 2 minutes of factories pledge a gasoline engine camshaft 3503503501.

21.

21.

23 - 43 - 43 - 4555296 808 946, 1.

72.

Cast steel of 313108313108ZG25 of heat treatment of condition of agglomeration of YT14 of machinery plant of 2 Taiyuan mine is right pull carry casing 2262261.

31.

32.

52.

54520min32min, 1.

6 Luoyang tractor 416051145 steel move heat treatment of condition of agglomeration of YT14 of plant gear plant pledge a semifinished product of reverse gear axis 3503500.

40.

433250 550, 1.

Condition of agglomeration of YT14 of factory of 2 Yunnan machine tool 1 ＃ heat treatment 2 ＃ heat treatment 41610841610841610845 steel forged steel 5905905900.

20.

20.

2333100 200 400 13* every blade 2 ＃ of 1 ＃ 　 are handling time system of different heat treatment 4.

Factory of ball of steel of 2 die Shanghai is our country bigger steel ball produces professional plant, to 19 ／ the steel ball die of 32 ″ norms had a test, classics heat treatment is compared not life of heat treatment mould raises 1 times above, raise 10 times than using life of Cr12Mo steel model formerly. The steel model life that uses at present short, work efficiency is low, accordingly, trial-produce 16 ″ of 3 11 ／ the mould of norms, heat treatment is compared not the mould life of heat treatment rises 4.

2 times, raise ten times than Cr12 steel model. Field test result sees a table 2, the life of the hard alloy mould after heat treatment rises generally. Express Dui of model of standards of state of alloy of brand of alloy of manufacturer of result of field test of die of ball of steel of 2 hard alloy to make ／ of frequency of punch of Mm of ／ of data data norms second.

Min - 10 thousand life raise ／ of 1 service life (times) steel of bearing of heat treatment of TG20CCr12 of plant of remarks Luoyang bearing 32 ″ of 19 ／ 32 ″ of 19 ／ GCr15GCr15  10.

7  10.

710610630310, condition of agglomeration of YG20C of factory of ball of steel of Shanghai of craze dimension out of tolerance 32 ″ of 19 ／ GCr151110020, osculatory circle has wear away, nick is patulous heat treatment 32 ″ of 19 ／ GCr15  11100421.

1 contact circle wears away somewhat, nuclear core caves agglomeration condition 16 ″ of 11 ／ GCr15  18.

06837.

5, crackle expands nuclear core damages heat treatment 16 ″ of 11 ／ GCr15  18.

068338.

84.

2 contacts circle wears away, nick expands somewhat 5 conclusion (1) after burner of temper by dipping in water of agglomeration of use WZS-20 and WZS-45 vacuum can realize hard alloy agglomeration, quench directly, when the province, save labour, energy-saving fall bad news. (2) the craft heat treatment with the hard alloy proper classics of all sorts of utility, its function all can differ level land increases, after milling and die use heat treatment of hard alloy classics, can twice improves service life. CNC Milling