New-style hard alloy -- fine grain and exceed fine grain hard alloy and Ti(C, n) and TiC base hard alloy

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Summary: Basically introduced fine grain and exceed fine grain hard alloy and Ti(C, n) radical and TiC base the sort of hard alloy and function, include a few experiments data. Keyword: Hard alloy; Fine grain; Exceed fine grain; Cermet; Cutting cutting tool the 1 sort that summarizes the article to introduce two kinds of new-style hard alloy and function: (1) fine grain and exceed fine grain hard alloy; (2)Ti(C, n) radical and TiC base hard alloy, this kind of hard alloy can be called again " cermet " , english cries " Cermet " . Ought to notice, "Cermet " composition still is carbide, with people hep alumina, nitrogen changes silicon pottery and porcelain is not the thing that be equal. Refining grain is the structure that changes hard alloy; And Ti(C, n) radical and TiC base the performance that the chemical composition that hard alloy is change stage gold can improve hard alloy through these two kinds of methods. After 2 fine grain and the grain that exceed hard alloy of fine grain hard alloy are refined, make decrescent of horniness photograph dimension, felt photograph is evener the ground distributings it is all round horniness photograph, can raise the hardness of hard alloy and wearability. If add cobaltic content appropriately, still can increase bending strength. The alloy that mine is used or cobaltic explore uses is thick grain, average grain dimension is 4 ～ 5 μ M; The cutting tool of common shop sign uses the alloy YT15, YG6 grain in all be, average grain dimension is 2 ～ 3 μ M: The average grain dimension of fine grain alloy is 1 ～ 2 μ M, inferior imperceptible bead alloy is 0.

1 μ of 5 ～ M, exceed fine grain alloy to be 0.

5 μ M is the following. The country such as Japan takes the development of this kind of alloy seriously very much, our country the name that in 20 centuries 60 time had fine grain alloy, be like YG3X, YG6X. 70 time evening begins to develop inferior imperceptible bead alloy. Individual plant continent of hard alloy factory inferior imperceptible bead brand has YS2T, YS8, YS10 and YD15, from tribute the YG643 of hard alloy factory, YG600, YG610, YG640 is inferior imperceptible bead brand (1) seeing a table. In the past structure of granule of fine grain He Yawei is multi-purpose the alloy at WC+Co (namely K kind alloy) . In recent years M kind with P kind (the way that WC+TiC+Co) alloy also refines to grain develops. 90 time of 80 ～ , each country already developed alloy of fine grain of favorable balance of trade. With fine taste bead, inferior the hard metal that small granule hard alloy replaces common and medium grain, if replace YG3, YG6 with YG3X, YG6X, replace YG6 with YS8, YS10, can improve cutting tool service life significantly. In recent years, from tribute hard alloy factory already was developed piece inferior ZK10UF of brand of small granule hard alloy and ZK30UF(are equivalent to K10 and K30) , hardness is HRA92.

5 ～ 91.

5, bending strength is 2 ～ 2.

5GPa, its taste a dimension on average for 0.

6 ～ 0.

8 μ M. This factory develops favorable balance of trade again Zcx10 of brand of the fine hard alloy that taste bead, Zcx30 and Zcx40(are equivalent to K10, K30 and K40) , hardness is HRA93 ～ 92, bending strength is 2.

5 ～ 3.

5GPa, its taste a dimension on average for 0.

4 ～ 0.

5 μ M. 3 Ti(C, n) radical and TiC base hard alloy (cermet) it is YT no matter kind, YG kind, or the new-style alloy that added TaC, NbC on their foundation, belong to WC radical alloy. Because be among them, WC is bases, content amounts to 65 ～ 97 ％ , it is binder with Co. Development rises TiC radical alloy later, its bases is TiC, occupy 60 ～ 80 ％ above, be contained less or do not contain WC, make binder with Ni, Mo. With photograph of WC radical alloy is compared, the density of TiC radical alloy is small, hardness is taller, lesser to the coefficient of friction of steel, felt is fought to wear away when cutting with fight diffuse tatty capability is stronger, have better wearability, dan Ren sex and fight plasticity to change the ability of red is a bit weak. Our country representative brand is individual plant of YN05, YN10(continent hard alloy factory develops) , normalizing of cutting of in order to and the rolled steel that move qualitative condition to fall, WC of excel of its cutting function base add up to your YT30, YT15. In recent years, our country develops Ti(C again, n) radical alloy, it is had with the character with TiC radical identical alloy and advantage, dan Jiren sex, fight plasticity to be out of shape TiC of ability prep above base alloy, have development perspective. Applied limits is the same as slightly at TiC base alloy, basically be cutting steel makings, but size range of pipe bent is wider. Watch 2 listed WC, TiC, TiN, Ti(C, the mechanical function of the material such as N) . Can see, tiC and Ti(C, the WC of hardness prep above of N) . Ti(C, each function of N) all uprights at TiC, TiN ask, reason Ti(C, the stretch model quantity of N) is more than TiC. Can explain from this, ti(C, n) Qi and TiC base the hardness of hard alloy and wearability prep above WC radical alloy; Ti(C, of N) radical alloy fight prep above of plasticity metabolic ability TiC radical alloy: Normal MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 28pt; TEXT-ALIGN: Center" Align=center>normal Align=center>WCnormal Align=center>TiCnormal Align=center>TiNnormal Align=center>Ti(C, n)normal MARGIN of hardness of Center" Align=center> normal temperature: 0cm 0cm 0pt; LINE-HEIGHT: 28pt; TEXT-ALIGN: Center" Align=center>2400normal Align=center>3200normal Align=center>1950normal Align=center>2600normal Align=center> stretch model measures E(× 104MPa)normal Align=center>72normal Align=center>32.

1normal Align=center>61.

6normal MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 28pt"> α P=1mm, f=0.

21mm/r; ° of 0=-6 of γ of parameter of cutting tool geometry, α 0=6 ° , kr=45 ° , λ S=-4 ° , γ ε =O.

8mm. The T- ν curve of earning is shown 1 times like the graph. Corresponding Taylor formula is: Normal > NT7.

48 (m/min)normal > TN20.

48 (m/min)normal > YT14.

35 (m/min) from the graph 1 visible, the standard of TN7 and TN20 is same, YT14 of their service life prep above is very much. (2) uses the Ti(C that hard alloy factory produces individual plant continent, n) radical razor blade of TN320 of hard alloy razor blade, do comparative milling test with YT14 razor blade, workpiece material is 45(HB187) of medium carbon steel. P=1mm of cutting dosage α , f=0.

125mm/r, ν =147m/min. 125mm of bit body diameter, workpiece width 50mm. ° of P=2 of γ of ~ of parameter of cutting tool geometry, γ R=0 ° , kr =75 ° , kr =15 ° . Gets cutting tool wear curve is shown 2 times like the graph, see TN320 excel YT14. (3) uses NT7, TN20, YT14 3 kinds of razor blade undertake turning experiments fighting pounding contrast. Workpiece is alloy steel gear (HB320) . α P=1mm, f=0.

2mm/r, percussion frequency is 4kHz. The experiment curve of earning is shown 3 times like the graph, arrive before collapse blade, NT7 razor blade and TN20 razor blade can susceptive number of blows is made an appointment with than tower above of YT14 razor blade respectively 30 ％ and 50 ％ . This shows, ti(C, hard alloy razor blade has N) radical better fight concussion ability. CNC Milling