CN1974204A - 涂层切削工具刀片 - Google Patents
涂层切削工具刀片 Download PDFInfo
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- 238000000576 coating method Methods 0.000 claims abstract description 22
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001141 Ductile iron Inorganic materials 0.000 claims abstract description 14
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- 229910001018 Cast iron Inorganic materials 0.000 claims description 5
- 229910001060 Gray iron Inorganic materials 0.000 claims description 5
- 238000005229 chemical vapour deposition Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
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- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
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Abstract
本发明公开了尤其有助于对球磨铸铁优选以高速进行车削加工的涂层切削工具刀片,其包括硬质合金基底和涂层,所述硬质合金基底的成分为5-9wt%Co、1-5wt%立方碳化物以及86-94wt%平衡量WC,所述涂层包括:具有等轴晶粒的TiCxNyOz第一层,具有柱状晶粒且厚度>10-15μm的TiCxNyOz层,具有等轴晶粒或板状晶粒且厚度为0.1-2μm的TiCxNyOz层,厚度为3-8μm的α-Al2O3层,以TiC为最外层且总厚度为0.5-2μm的TiN+TiC多层结构的外层,刃线内和前刀面上的外部涂层被除去,从而使α-Al2O3层位于沿着切削刃线的顶部上和位于前刀面上,外部TiC层为位于后刀面上的顶层。
Description
技术领域
本发明涉及尤其有助于对球墨铸铁部件进行高速车削加工的涂层切削工具刀片。
背景技术
铸铁材料可分为两个主要类别:灰口铸铁和球磨铸铁。球墨铸铁被认为是一种比较难加工的材料。铸铁常具有铸皮(cast skin)外层,其可能含有砂砾、铁锈及其它杂质的各种夹杂物;铸铁还具有脱碳表面区,其包含含量高于其余材料的铁素体。此外,加工球墨铸铁会对Al2O3涂层的切削工具造成所谓的粘附磨损以及更高级别的磨料磨损。当涂层的碎片或单个晶粒被形成的工件切屑拉离切削刃时,就会发生粘附磨损。靠近刃线的这种剥落最终造成穿过涂层的局部穿透,导致化学磨损加快和工具寿命缩短。
在使用或不使用冷却剂的情况下,对球墨铸铁进行高速加工时,另一个重要因素是在切削刃形成过热,其造成刀片软化,由此导致涂层因加速磨损而发生塑性形变和剥落。
EP 753603公开了一种涂层切削刀片,其由硬质合金体和涂层组成,所述硬质合金体的组成为:5-11wt%的Co、<10wt%的金属Ti、Ta和/或Nb的立方碳化物、以及平衡量的WC,所述涂层包括:最内部的0.1-2μm的TiCxNyOz层、2-15μm的TiCxNyOz层、0.1-2μm的TiCxNyOz层、2-10μm的α-Al2O3层,该涂层切削刀片特别适于对低合金钢零件进行机械加工。
EP 953065公开了一种涂层切削刀片,其具有基于WC-Co的基底和涂层,所述基底具有<0.5wt%的立方碳化物,所述涂层包括最内部的0.1-2μm的TiCxNyOz层、5-10μm的TiCxNy层、0.1-2μm的TiCxNyOz层、3-6μm的α-Al2O3层、以及0.5-3μm的TiCxNyOz外层或0.5-3μm厚的TiN+TiC+TiN序列多层,该涂层切削刀片尤其有助于加工铸铁。
发明内容
本发明的目的之一在于提供涂层切削工具刀片,其尤其有助于对球墨铸铁进行车削,优选以高切削速度进行车削。
现已令人惊奇地发现,能够获得对于上述切削操作中经常出现的磨损类型具有改善性能的切削工具刀片,所述切削工具刀片包括:具有低立方碳化物含量的硬质合金体,厚的柱状TiCxNyOz层,厚的织构化α-Al2O3层,TiC为最外层的TiN+TiC多层的顶部后刀面层,以及湿喷砂(wet blasted)处理的α-Al2O3前刀面和刃线层。
附图说明
图1为本发明所述涂层刀片的显微照片,其中:
A-硬质合金体;
B-TiCxNyOz连接层;
C-具有柱状晶粒的TiCxNyOz层;
D-TiCxNyOz连接层;
E-织构化α-Al2O3层;
F-TiN+TiC多层。
具体实施方式
根据本发明,提供了一种包括硬质合金体和涂层的切削工具刀片,其中,该硬质合金体的组成为:5-9wt%、优选6-8wt%、最优选6.5-7.1wt%的Co;1-5wt%、优选2-4wt%、最优选2.6-3.4wt%的金属Ta和Nb的立方碳化物,TaC的含量优选为2-3wt%,最优选为2.4-3.0wt%,NbC的含量优选为0.20-0.35wt%,最优选为0.27-0.33wt%;组成中Ti的含量对应于工业杂质(technical impurity)的含量;86-94wt%、优选88-92wt%、最优选89.5-90.6wt%平衡量的WC。硬质合金体的矫顽力为19.5-24.5kA/m,相对应的平均晶粒度为约0.7-1.5μm。
该涂层包括:
-TiCxNyOz第一最内层,其中x+y+z=1,优选y>x且z<0.1,最优选y>0.8且z=0;其厚度为0.1-2μm,且具有尺寸<0.5μm的等轴晶粒;
-TiCxNyOz层,其中x+y+z=1,优选z=0,x>0.3且y>0.3,最优选x>0.5;其厚度>10-15μm,最优选为11-13μm,具有柱状晶粒;
-TiCxNyOz层,其中x+y+z=1,z<0.5,优选x>y,最优选x>0.5且0.1<z<0.4;其厚度为0.1-2μm,且具有尺寸<0.5μm的等轴晶粒或板状(plate-like)晶粒,该层与最内层相同或不同;
-平滑、细粒的、织构化α-Al2O3层,其厚度为3-8μm,优选3-6μm,晶粒度为0.5-2μm;
-具有一种或多种顺序的TiN+TiC多层结构外层,以TiC为最外层,总厚度为0.5-2μm,优选0.7-1.3μm,还优选晶粒度<1μm。
在刃线内和前刀面上的外部涂层被除去,从而使α-Al2O3层位于沿着切削刃线的顶部上和位于前刀面上,且外部TiC层为后刀面上的顶层。因而该涂层刀片在刃线和前刀面上具有平滑的α-Al2O3表面,且优选在10μm长度上的表面粗糙度为Rmax≤0.4μm,且后刀面(flank face)呈亮灰色。该亮灰色顶部涂层使得用过的刃易于辨识。
而且,如US 5,654,035、EP 659903或EP 738336的公开内容所述,在由X射线衍射(XRD)进行测定后发现,α-Al2O3层在(104)-、(012)-或(110)-方向具有优选的晶体生长取向,且优选(012)-方向。织构系数TC定义为:
其中
I(hkl)=(hkl)反射的测定强度;
I0(hkl)=根据卡片号43-1484所述的ASTM标准粉末衍射图样数据的标准强度;
n=计算中所使用的反射数目,所使用的(hkl)反射为:(012),(104),(110),(113),(300),(116)。
(012)、(104)或(110)晶面集合中某一个的TC值应大于1.3,优选大于1.5。
本发明还涉及一种制造上述包括硬质合金体的涂层切削工具刀片的方法,所述硬质合金体的组成为:5-9wt%、优选6-8wt%、最优选6.5-7.1wt%的Co;1-5wt%、优选2-4wt%、最优选2.6-3.4wt%的金属Ta和Nb的立方碳化物,TaC的含量优选为2-3wt%,最优选为2.4-3.0wt%,NbC的含量优选为0.20-0.35wt%,最优选为0.27-0.33wt%;组成中Ti的含量对应于工业杂质的含量;以及86-94wt%、优选88-92wt%、最优选89.5-90.6wt%平衡量的WC,该硬质合金体的矫顽力为19.5-24.5kA/m,相对应的平均晶粒度为约0.7-1.5μm。
该硬质合金体主要通过常规方法所述的粉末混合、球磨、喷雾干燥、挤压和烧结而制得。
然后该刀片被涂覆以:
-TiCxNyOz第一最内层,其中x+y+z=1,优选y>x且z<0.1,最优选y>0.8且z=0;其厚度为0.1-2μm,且具有尺寸<0.5μm的等轴晶粒;
-TiCxNyOz层,其中x+y+z=1,优选z=0,x>0.3且y>0.3,最优选x>0.5;其厚度>10-15μm,最优选为11-13μm,具有柱状晶粒,其优选通过MTCVD技术(在700-900℃温度范围内利用乙腈作为形成所述层的碳和氮源)沉积而成。然而,实际条件在一定程度上取决于所用装置的设计,并可由本领域技术人员确定;
-TiCxNyOz层,其中x+y+z=1,z<0.5,优选x>y,最优选x>0.5且0.1<z<0.4,其厚度为0.1-2μm,且具有尺寸<0.5μm的等轴晶粒或板状晶粒,利用已知CVD方法制得,该层与最内层相同或不同;
-由平滑、细粒的、织构化α-Al2O3形成的中间层,如US 5,654,035、EP 659903或EP 738336的公开内容所述,其厚度为3-8μm,优选3-6μm,优选晶粒度为0.5-2μm;
-具有一种或多种顺序的TiN+TiC多层结构外层,以TiC为最外层,该层总厚度为0.5-2μm,优选0.7-1.3μm。该层优选具有尺寸<1μm的晶粒。
为了获得具有更高韧性的平滑切削刃线,在足够高的温度下利用Al2O3粗砂对该涂层刀片进行湿喷砂处理,以除去TiN+TiC顶部多层,产生该刀片刃线和前刀面的平滑表面,并使后刀面上的亮灰色最外TiC层基本未受影响,从而使得用过的刃易于辨识。
当希望获得z>0的TiCxNyOz层时,向反应气体混合物中加入CO2和/或CO。
本发明还涉及在干燥条件下使用上述切削工具刀片对灰口铸铁和球墨铸铁进行车削,所述灰口铸铁和球墨铸铁具有或不具有铸皮,切削速度为250-550m/min,根据切削速度和刀片几何形状而定的进给量为0.10-0.35mm/rev。
实施例1
A.CNMG 120412-KM型硬质合金切削工具刀片,其组成为:6.8wt%的Co,2.7wt%的Tac,0.3wt%的Nbc,以及平衡量WC,平均晶粒度为1μm,该切削工具刀片涂覆有0.5μm的等轴TiCxNy层,其中x=0.1,y=0.9,利用Jeffries法测定平均晶粒度为约0.2μm;其后为12.0μm厚的TiCxNy层,其中x=0.55,y=0.45,具有柱状晶粒,利用MTCVD技术(处理温度为885℃,利用CH3CN作为碳/氮源)制得。在同一涂覆循环过程的后续处理步骤中,沉积出1μm厚的TiCxNyOz层,其中x=0.6,y=0.2,z=0.2,且具有等轴晶粒,平均晶粒度为0.2μm;其后为根据US5,654,035所述条件沉积出的5.0μm厚的(012)织构化α-Al2O3层,其TC(012)=1.81,平均晶粒度为约1.2μm。在该α-Al2O3层顶部上,TiN+TiC+TiN+TiC沉积在多层结构中,其总涂层厚度为1.5μm,各单独层中的平均晶粒度<0.3μm。最后,对所述刀片进行湿喷砂处理,在该处理过程中,顶部的TiN+TiC多层结构被从切削刃线和前刀面除去,并且在该同一操作中,对Al2O3层进行平整。
B.CNMG 120412-KM型硬质合金切削工具刀片,其组成为:6.8wt%的Co,2.7wt%的TaC,0.3wt%的NbC,以及平衡量的WC,该切削工具刀片涂覆有0.5μm的等轴TiCxNy层,其中x=0.1,y=0.9,平均晶粒度为约0.2μm;其后为12.0μm厚的TiCxNy层,其中x=0.55,y=0.45,具有柱状晶粒,利用MTCVD技术(处理温度为885℃,利用CH3CN作为碳/氮源)制得。在同一涂覆循环过程的后续处理步骤中,沉积出1μm厚的TiCxNyOz层,其中x=0.6,y=0.2,z=0.2,具有等轴晶粒,平均晶粒度为0.2μm;其后为根据US 5,654,035所述条件沉积出的5μm厚(012)织构化α-Al2O3层,其TC(012)=1.93,平均晶粒度为约1.2μm。在该α-Al2O3层顶部上,TiN+TiC+TiN+TiC沉积在多层结构中,其总涂层厚度为1.5μm,各个单独层中的平均晶粒度<0.3μm。最后,对该刀片进行刷光处理(brushing treatment),其中利用含SiC作为磨料的320目刷(mesh brush)对切削刃线进行平整,通过该刷光处理沿着切削刃线将外部TiN+TiC多层结构除去。
C.CNMG 120412-KM型硬质合金切削工具刀片,其组成为:6.8wt%的Co,2.7wt%的TaC,0.3wt%的NbC,以及平衡量的WC,该切削工具刀片涂覆有0.5μm的等轴TiCxNy层,其中x=0.1,y=0.9,平均晶粒度为约0.2μm;其后为5.0μm厚的TiCxNy层,其中x=0.55,y=0.45,且具有柱状晶粒,利用MTCVD技术(处理温度为885℃,利用CH3CN作为碳和氮源)制得。在同一涂覆循环过程的后续处理步骤中,沉积出1μm厚的TiCxNyOz层,其中x=0.6,y=0.2,z=0.2,且具有等轴晶粒,平均晶粒度为0.2μm;其后为根据US 5,654,035所述条件沉积出的4.0μm厚的(012)织构化α-Al2O3层,其TC(012)=1.85,平均晶粒度为约1.2μm。最后,对所述刀片进行湿喷砂处理,在该处理过程中,对Al2O3层进行平整。
D.CNMG 120412-KM型硬质合金切削工具刀片,其组成为:6.0wt%的Co以及平衡量的WC,该切削工具刀片涂覆有0.5μm的等轴TiCxNyOz层,其中x=0.1,y=0.9,z=0,平均晶粒度为约0.2μm;其后为利用MTCVD技术(处理温度为850℃,利用CH3CN作为碳和氮源)而得的8.0μm厚的TiCxNy层,其中x=0.55,y=0.45,且具有柱状晶粒。在同一涂覆循环过程的后续处理步骤中,沉积出1μm厚的TiCxNyOz层,其中x=0.6,y=0.2,z=0.2,且具有等轴晶粒,平均晶粒度为0.2μm;其后为根据US 5,654,035所述条件沉积出的5.0μm厚的(012)织构化α-Al2O3层,其TC(012)=1.90,平均晶粒度为约1.2μm。在该α-Al2O3层顶部上,TiN+TiC+TiN+TiC+TiN沉积在多层结构中,其总涂层厚度为1.5μm,各个单独层中的平均晶粒度<0.3μm。最后,对该刀片进行刷光处理,其中利用含SiC作为磨料的320目刷对切削刃线进行平整,通过该刷光处理沿着切削刃线将外部TiN+TiC多层结构除去。
在端面操作中对该刀片进行测试。工件材料为球墨铸铁SS727。该工件的形状使得在每次旋转过程中均形成间断切削环境。切削速度为250m/min,进给量为0.10mm/rev,切削深度为2.0mm。使用冷却剂进行该操作。
这类操作一般会造成涂层的严重剥落。涂层成碎片脱离于刀片。将发生涂层剥落的刃线部分与切削操作中所用的刃线总长进行比较,便能够测定该磨损。
刀片类型 发生剥落的刃线%
A(本发明) <5
B(外部发明(outside invention)) 20
C(外部发明) <5
D(现有技术) 15
实施例2
将上述实施例1中的刀片在灰口铸铁SS0125中进行间断切削操作测试。该切削条件对涂层的抗剥落性及其抗化学和磨料磨损性有很高要求。工件的形状使得对于每次旋转而言,将得到工件中的两个入口,形成间隔切削环境。切削速度为300m/min,切削进给量为0.25mm/rev,切削深度为2.0mm。该机械加工过程中不使用任何冷却剂。
刀片类型 刃损坏前的道次数
A(本发明) 88
B(外部发明) 85
C(外部发明) 60
D(现有技术) 70
实施例3
将上述实施例1中的刀片在造成切削刃发生变形、导致涂层剥落和刀片磨损加剧的车削测试中进行测试。该测试在球磨铸铁SS0737中进行,并在纵向车削操作中结合了一定的进给量和切削深度。找到了硬质合金发生变形前的最高可能切削速度。
刀片类型 最高可能切削速度,m/min
A(本发明) 550
B(外部发明) 525
C(外部发明) 475
D(现有技术) 425
实施例4
将上述实施例1中的刀片在球墨铸铁SS0727中进行连续切削操作测试。该切削条件对涂层的抗化学和磨料磨损性有很高要求。切削速度为350m/min,进给量为0.30mm/rev,切削深度为2.0mm。使用冷却剂进行该操作。
刀片类型 刃损坏前的道次数
A(本发明) 57
B(外部发明) 54
C(外部发明) 23
D(现有技术) 38
Claims (5)
1.一种包括涂层和硬质合金体的切削工具刀片,其特征在于,所述硬质合金体由以下物质组成:5-9wt%、优选6-8wt%、最优选6.5-7.1wt%的Co;1-5wt%、优选2-4wt%、最优选2.6-3.4wt%的金属Ta和Nb的立方碳化物,TaC的含量优选为2-3wt%,最优选为2.4-3.0wt%,NbC的含量优选为0.2-0.35wt%,最优选为0.27-0.33wt%;组成中Ti的含量对应于工业杂质的含量;和86-94wt%、优选88-92wt%平衡量的WC;该硬质合金体的矫顽力为19.5-24.5kA/m;所述涂层包括:
-TiCxNyOz第一最内层,其中x+y+z=1,y>x,且z<0.1;该层的厚度为0.1-2μm,具有尺寸<0.5μm的等轴晶粒;
-TiCxNyOz层,其中x+y+z=1,优选z=0,x>0.3,且y>0.3;该层的厚度>10-15μm,优选为11-13μm,具有柱状晶粒;
-TiCxNyOz
层,其中x+y+z=1,z<0.5,x>y;该层的厚度为0.1-2μm,具有尺寸<0.5μm的等轴晶粒或板状晶粒;
-平滑、细粒的、织构化α-Al2O3层,其厚度为3-8μm,优选3-6μm,晶粒度为0.5-2μm;
-具有一种或多种顺序的TiN+TiC多层结构的外层,以TiC为最外层,总厚度为0.5-2μm,优选0.7-1.3μm,
在刃线内和前刀面上的外部涂层被除去,从而使Al2O3层位于沿着切削刃线的顶部上和位于前刀面上,且外部TiC层为后刀面上的顶层。
2.如前述权利要求所述的切削刀片,其特征在于,该α-Al2O3层具有(012)-方向的织构,其织构系数TC(012)大于1.3。
3.如前述权利要求中任一项所述的切削刀片,其特征在于,TiCxNyOz第一最内层具有以下组成:z=0,且y>0.8。
4.一种用于制造包括硬质合金体和涂层的切削工具刀片的方法,其特征在于,该硬质合金体的组成为:5-9wt%的Co;1-5wt%的金属Ta和Nb的立方碳化物;组成中Ti的含量对应于工业杂质的含量;和86-94wt%平衡量的WC;该硬质合金体的矫顽力为19.5-24.5kA/m;该硬质合金体通过粉末混合、球磨、喷雾干燥、挤压和烧结而制得;其涂覆有:
-TiCxNyOz第一最内层,其厚度为0.1-2μm,具有尺寸<0.5μm的等轴晶粒,利用CVD方法制得;
-TiCxNyOZ层,其厚度>10-15μm,并具有柱状晶粒,其直径<5μm,通过MTCVD技术沉积而成,所述MTCVD技术在850-900℃的优选温度范围内利用乙腈作为形成所述层的碳和氮源;
-TiCxNyOz层,其厚度为0.1-2μm,具有尺寸<0.5μm的等轴晶粒或板状晶粒,利用CVD方法制得;
-平整、细粒的、织构化α-Al2O3层,其厚度为3-8μm,晶粒度为0.5-2μm,利用CVD方法制得;
-具有一种或多种顺序的TiN+TiC多层结构的外层,以TiC为最外层,总厚度为0.5-2μm,优选0.7-1.3μm,利用CVD方法制得;以及
-将TiN+TiC多层结构的外层通过喷砂除去,从而使α-Al2O3层沿着切削刃线和在前刀面上得以外露和平整,并使最外部TiC层基本上未受影响地留于切削刀片的后刀面上。
5.如权利要求1-3所述的切削工具刀片在对铸铁如灰口铸铁和球墨铸铁、尤其是球磨铸铁进行车削加工中的应用,其切削速度为250-550m/min,进给量根据切削速度和刀片几何形状而定为0.10-0.35mm/rev。
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SE509560C2 (sv) * | 1996-09-06 | 1999-02-08 | Sandvik Ab | Belagt hårdmetallskär för bearbetning av gjutjärn |
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2005
- 2005-11-21 SE SE0502553A patent/SE529200C2/sv unknown
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- 2006-11-13 AT AT06023511T patent/ATE429527T1/de active
- 2006-11-13 EP EP06023511A patent/EP1788123B1/en not_active Expired - Fee Related
- 2006-11-13 DE DE602006006393T patent/DE602006006393D1/de active Active
- 2006-11-14 IL IL179249A patent/IL179249A0/en unknown
- 2006-11-20 US US11/601,845 patent/US7897247B2/en not_active Expired - Fee Related
- 2006-11-20 JP JP2006312456A patent/JP2007136666A/ja active Pending
- 2006-11-21 KR KR1020060115009A patent/KR101314357B1/ko not_active IP Right Cessation
- 2006-11-21 CN CNA2006101493514A patent/CN1974204A/zh active Pending
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CN101342602B (zh) * | 2007-07-13 | 2013-03-13 | 山高刀具公司 | 涂层切削刀具 |
CN101462386A (zh) * | 2007-12-21 | 2009-06-24 | 山特维克知识产权股份有限公司 | 涂层切削刀具和制造涂层切削刀具的方法 |
CN108698133A (zh) * | 2016-02-18 | 2018-10-23 | 株式会社泰珂洛 | 被覆切削工具 |
CN108698133B (zh) * | 2016-02-18 | 2020-05-05 | 株式会社泰珂洛 | 被覆切削工具 |
CN109996629A (zh) * | 2016-11-08 | 2019-07-09 | 山特维克知识产权股份有限公司 | 机械加工ti、ti合金和ni基合金的方法 |
CN109996629B (zh) * | 2016-11-08 | 2021-09-03 | 山特维克知识产权股份有限公司 | 机械加工ti、ti合金和ni基合金的方法 |
CN113151804A (zh) * | 2021-04-22 | 2021-07-23 | 厦门钨业股份有限公司 | 一种碳氮氧化钛涂层及其应用 |
Also Published As
Publication number | Publication date |
---|---|
EP1788123B1 (en) | 2009-04-22 |
US20070134517A1 (en) | 2007-06-14 |
IL179249A0 (en) | 2007-03-08 |
US7897247B2 (en) | 2011-03-01 |
SE0502553L (sv) | 2007-05-22 |
DE602006006393D1 (de) | 2009-06-04 |
ATE429527T1 (de) | 2009-05-15 |
KR20070053637A (ko) | 2007-05-25 |
JP2007136666A (ja) | 2007-06-07 |
EP1788123A1 (en) | 2007-05-23 |
KR101314357B1 (ko) | 2013-10-04 |
SE529200C2 (sv) | 2007-05-29 |
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