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1. 发明专利

JP2012214859A Spring, and method for producing the same 审中-公开
标题翻译：弹簧及其制造方法
公开(公告)号：JP2012214859A
公开(公告)日：2012-11-08
申请号：JP2011081966
申请日：2011-04-01
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： TAKAMURA NORITOSHI , YAMAMOTO FUMIO , ONO YOSHIKI , SUZUKI TAKESHI , KUROKAWA SHINPEI
IPC分类号： C21D9/02 , B21F35/00 , C21D7/00 , C21D7/06 , C22C38/00 , C22C38/34 , F16F1/02
CPC分类号： B21F35/00 , C21D7/06 , C21D9/02 , C21D2211/002 , C22C38/02 , C22C38/04 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To provide a spring that has a high compression residual stress layer having improved fatigue resistance and that has increased simplicity of the production process and reduced materials cost, and to provide a method for producing the spring.SOLUTION: A steel material contains 0.5-0.7 mass% C, 1.0-2.0 mass% Si, 0.1-1.0 mass% Mn, 0.1-1.0 mass% Cr, ≤0.035 mass% P, ≤0.035 mass% S, and the remainder comprising iron and inevitable impurities. The steel material is processed by the following steps in sequence: a forming step of forming the steel material into spring shape; a heat treatment step of austenitizing it at a temperature in a range of (a temperature of Ac3 point) to (the temperature of Ac3 point +250°C), cooling it at a speed of ≥20°C/sec, isothermally holding it for 400 seconds or more at a temperature in a range of (Ms point -20°C) to (Ms point +60°C), and cooling it to a room temperature at cooling speed of ≥20°C/sec; a setting step of giving a permanent strain to it; and a shot peening step of impacting it with shot.
摘要翻译：要解决的问题：提供一种具有高抗疲劳性的高压缩残余应力层的弹簧，并且提高了生产工艺的简单性并降低了材料成本，并且提供了一种用于生产弹簧的方法。钢材含有0.5-0.7质量％C，1.0-2.0质量％Si，0.1-1.0质量％Mn，0.1-1.0质量％Cr，≤0.035质量％P，≤0.035质量％S和剩余部分包含铁和不可避免的杂质。钢材按顺序按以下步骤进行处理：将钢材形成为弹簧形状的成形工序; 在（Ac3点的温度）到（Ac3点+ 250℃的温度）的范围内的温度下对其进行奥氏体化的热处理工序，以≥20℃/秒的速度冷却，等温保持在（Ms点-20℃）至（Ms点+ 60℃）的范围内的温度下，在≥20℃/秒的冷却速度下将其冷却至室温400秒以上; 给予永久性压力的设定步骤; 并用喷枪冲击打喷丸。版权所有（C）2013，JPO＆INPIT

2. 发明专利

JP2010222671A High-strength and high-ductility steel for spring, method for producing same, spring 有权
标题翻译：用于弹簧的高强度和高强度钢，用于生产它的方法，弹簧
公开(公告)号：JP2010222671A
公开(公告)日：2010-10-07
申请号：JP2009073373
申请日：2009-03-25
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： SUZUKI TAKESHI , ONO YOSHIKI
IPC分类号： C22C38/00 , C21D6/00 , C21D9/02 , C22C38/34 , F16F1/02
CPC分类号： C21D9/02 , C21D2211/001 , C21D2211/002 , C21D2211/008 , C22C38/04 , C22C38/18 , C22C38/34 , Y02P10/212 , Y10S148/908
摘要： PROBLEM TO BE SOLVED: To provide a steel for springs having a high strength such as a tensile strength of 1,800 MPa or more and a high ductility; a spring; and a method for producing the steel and the spring. SOLUTION: The high-strength and high-ductility steel for springs has such a whole composition as to satisfy, by mass%, 0.5-0.6% C, 1.0-1.8% Si, 0.1-1.0% Mn, 0.1-1.0% Cr, 0.035% or less P, 0.035% or less S and the balance iron with unavoidable impurities, and has an internal structure in which bainite occupies 65% or more by area rate in an arbitrary cross section; remaining austenite occupies 6-13% and martensite occupies the balance (including 0%). The remaining austenite contains 0.65-1.7% C by average concentration. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供具有高强度的弹簧钢，例如1800MPa以上的拉伸强度和高延展性; 一个春天以及钢和弹簧的制造方法。解决方案：用于弹簧的高强度高延展性钢的全部组成按质量％计含有0.5-0.6％C，1.0-1.8％Si，0.1-1.0％Mn，0.1-1.0％％Cr，0.035％以下的P，0.035％以下的S，余量为不可避免的杂质的铁，并且具有任意截面的贝氏体占面积率为65％以上的内部结构; 剩余奥氏体占6-13％，马氏体占平衡（含0％）。剩余的奥氏体含有平均浓度为0.65-1.7％C。版权所有（C）2011，JPO＆INPIT

3. 发明专利

JP2010185478A Torsion bar and manufacturing method thereof 有权
标题翻译：扭力杆及其制造方法
公开(公告)号：JP2010185478A
公开(公告)日：2010-08-26
申请号：JP2009028321
申请日：2009-02-10
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： NAKAJIMA SHUNJI , TAKAHASHI FUMIO , ONO YOSHIKI
IPC分类号： F16F1/02 , C21D1/10 , C21D9/02 , F16F1/14
CPC分类号： Y02P10/253
摘要： PROBLEM TO BE SOLVED: To provide a torsion bar having high strength against fatigue which can cope with a large stress load, and its manufacturing method. SOLUTION: High-frequency quenching is applied to a steel material which is a raw material of the torsion bar in a state that a torsional stress is imposed in a 45°-direction (generation direction of tension main stress) which is the use direction of the torsion bar, and after that, a compression residual stress is imparted in the 45°-direction by releasing a load of the torsional stress. In the torsion bar, the fatigue generated by the tension main stress generated in the 45°-direction which is the use direction causes breakage, but when the compression residual stress is imparted in the 45°-direction, the tension main stress generated in the 45°-direction is offset by the compression residual stress at the use of the torsion bar. When the torsional stress imposed during the high-frequency quenching is lower than 900 MPa, a limit of the fatigue of a sample is almost the same as that not imposed with the torsional stress, but when the torsional stress is greater than or equal to 900 MPa, the limit of the fatigue of the sample is increased. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够应付大的应力负荷的抗疲劳强度的扭杆及其制造方法。解决方案：在作为扭杆的原材料的钢材上施加高频淬火，其状态是以45°方向（拉伸主应力的产生方向）施加扭转应力使用扭杆的方向，然后通过释放扭转应力的载荷而在45°方向上施加压缩残余应力。在扭杆中，由作为使用方向的45°方向产生的张力主应力产生的疲劳导致断裂，但是当以45°方向施加压缩残余应力时，在在使用扭杆时，45°方向被压缩残余应力所抵消。当在高频淬火期间施加的扭转应力低于900MPa时，样品的疲劳极限几乎与扭转应力不同，但当扭转应力大于或等于900 MPa，样品的疲劳极限增加。版权所有（C）2010，JPO＆INPIT

4. 发明专利

JP2013159802A Coil spring and production method therefor 审中-公开
标题翻译：线圈弹簧及其生产方法
公开(公告)号：JP2013159802A
公开(公告)日：2013-08-19
申请号：JP2012021251
申请日：2012-02-02
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： KUROKAWA SHINPEI , SUZUKI TAKESHI , ONO YOSHIKI , SHIBAIRI KOSUKE
IPC分类号： C22C38/00 , C21D7/06 , C21D9/02 , C22C38/34
CPC分类号： C21D7/06 , C21D9/02 , C21D2211/001 , C21D2211/002 , C21D2211/008 , C22C38/02 , C22C38/04 , C22C38/08
摘要： PROBLEM TO BE SOLVED: To provide a coil spring which achieves the reduction in material cost and the simplification of a production process without lowering a yield rate and is excellent in fatigue resistance.SOLUTION: A coil spring has a composition comprising, by mass, 0.5-0.7% C, 1.0-2.0% Si, 0.1-1.0% Mn, 0.1-1.0% Cr, 0.035% or less P, and 0.035% or less S, with the balance comprising iron and unavoidable impurities; and has a structure, in an arbitrary wire cross section, containing, by area ratio, 65% or more of bainite and 4-13% of retained austenite. The average C concentration in the retained austenite is 0.65-1.7%. In the residual stress distribution in an arbitrary wire cross section, when the cross section circle-equivalent diameter of a cross section of the wire is D (mm), the compressed residual stress layer is formed in a range of from the surface to 0.35 mm to D/4, and the maximum compressive residual stress is 800-2,000 MPa. In the Vickers hardness distribution in an arbitrary wire cross section, the hardness at the center is 550-650 HV, and a high-hardness layer harder by 50-500 HV than the center is formed from the surface to a depth of 0.05-0.3 mm. Both ends of the wire are ground to be flat.
摘要翻译：要解决的问题：提供一种实现材料成本降低和简化生产过程而不降低成品率并且耐疲劳性优异的螺旋弹簧。解决方案：螺旋弹簧具有质量分数为0.5 -0.7％C，1.0-2.0％Si，0.1-1.0％Mn，0.1-1.0％Cr，0.035％以下P和0.035％以下S，余量由铁和不可避免的杂质构成; 并且具有在任意的线截面中，以面积比为65％以上的贝氏体和4〜13％的残余奥氏体的结构。残留奥氏体中的平均C浓度为0.65〜1.7％。在任意线截面的残余应力分布中，当线的横截面的截面圆当量直径为D（mm）时，压缩残余应力层形成在从表面到0.35mm的范围内至D / 4，最大压缩残余应力为800-2000MPa。在任意线截面的维氏硬度分布中，中心处的硬度为550-650HV，并且从表面到深度为0.05-0.3，形成比中心更硬的50-500HV的高硬度层 mm。电线的两端研磨成平坦的。

5. 发明专利

JP2013036113A Compression coil spring and method for producing the same 有权
标题翻译：压缩线圈弹簧及其制造方法
公开(公告)号：JP2013036113A
公开(公告)日：2013-02-21
申请号：JP2011175520
申请日：2011-08-11
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： IUMI KAZUYA , SHIRAISHI TORU , ONO YUICHIRO , ONO YOSHIKI
IPC分类号： C22C38/00 , B24C1/10 , C21D7/06 , C21D9/02 , C22C38/04 , C22C38/18 , C22C38/54 , F16F1/06
CPC分类号： F16F1/021 , B21F35/00 , B24C1/10 , C21D7/06 , C21D8/065 , C21D9/02 , C21D2211/008 , C22C38/02 , C22C38/04 , C22C38/18 , C22C38/24 , C22C38/34 , C22C38/46 , F16F1/06
摘要： PROBLEM TO BE SOLVED: To provide a highly durable compression coil spring, which is produced using an inexpensive wire rod while imparting adequate residual stress to the wire rod, and to provide a method for producing the compression coil spring.SOLUTION: The compression coil spring is made of a steel wire rod containing, by weight, 0.45-0.85% C, 0.15-2.5% Si, and 0.3-1.0% Mn, and having an equivalent circle diameter of 1.5-9.0 mm. The compression coil spring has hardness of 570-700 HV in any optional cross-section of the wire rod, unloaded compressive residual stress equal to or greater than 200 MPa on the inner side of the coil spring at a depth of 0.2 mm from the surface substantially in the direction of the maximum principal stress when a compressive load is applied to the spring, and unloaded compressive residual stress equal to or greater than 100 MPa at a depth of 0.4 mm from the surface.
摘要翻译：要解决的问题：提供一种耐用性高的压缩螺旋弹簧，其使用便宜的线材制造，同时对线材赋予足够的残余应力，并提供一种用于制造压缩螺旋弹簧的方法。解决方案：压缩螺旋弹簧由钢线材制成，该钢线材含有重量比为0.45-0.85％的C，0.15-2.5％的Si和0.3-1.0％的Mn，其当量的圆直径为1.5-9.0 mm。压缩螺旋弹簧在线材的任意可选横截面中的硬度为570-700HV，螺旋弹簧内表面的距离表面0.2mm深度的无载压缩残余应力等于或大于200MPa 基本上在向弹簧施加压缩载荷时的最大主应力的方向上，并且在离表面0.4mm的深度处，等于或大于100MPa的无载压缩残余应力。版权所有（C）2013，JPO＆INPIT

6. 发明专利

JP2012251234A Titanium alloy member and method for producing the same 有权
标题翻译：钛合金构件及其制造方法
公开(公告)号：JP2012251234A
公开(公告)日：2012-12-20
申请号：JP2011127233
申请日：2011-06-07
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： SHIRAISHI TORU , ONO YOSHIKI , ARAOKA YUJI
IPC分类号： C22C1/04 , A61L27/00 , B22F3/24 , B22F9/04 , B24C1/10 , C22C14/00 , C22F1/00 , C22F1/18
CPC分类号： B22F1/0081 , A61L27/06 , B22F3/24 , B22F2998/10 , C22C1/0458 , C22C14/00 , C22F1/183 , C23C8/80 , C23C26/00 , B22F1/0088 , B22F1/0003 , B22F3/10 , B22F3/14 , B22F3/15 , B22F3/105
摘要： PROBLEM TO BE SOLVED: To provide: a high strength titanium alloy member made of an α-β titanium alloy, capable of obtaining high strength and high durability not only on a surface but also over the whole of the inside of the member, imparted with a large and deep compressive residual stress in the vicinity of the surface, and excellent in fatigue resistance; and a method for producing the high strength titanium alloy member.SOLUTION: The method for producing a high strength titanium alloy member includes: a step of preparing a raw material comprising a titanium alloy; a nitridation step of forming a nitride compound layer and/or a nitrogen solid solution layer on a surface layer of the raw material by nitriding to produce a nitrogen-containing raw material; a mixing step of mixing the raw material with the nitrogen-containing raw material to obtain a nitrogen-containing mixed material; a sintering step of bonding the materials in the nitrogen-containing mixed material to each other and dispersing nitrogen included in the nitrogen-containing raw material uniformly in the form of a solid solution in the whole of the inside of a sintered titanium alloy member to obtain the sintered titanium alloy member; a hot plastic working step of performing hot plastic working to the sintered titanium alloy member to obtain a processing member and/or a heat treatment step of performing heat treatment to the sintered titanium alloy member to obtain a processing member; and a surface treatment step of imparting a compressive residual stress to the processing member.
摘要翻译：要解决的问题：提供：由α-β钛合金制成的高强度钛合金构件，其能够不仅在表面上而且在整个内部获得高强度和高耐久性在表面附近赋予大而深的压缩残余应力，耐疲劳性优异; 以及高强度钛合金构件的制造方法。解决方案：高强度钛合金构件的制造方法包括：制备包含钛合金的原料的步骤; 氮化步骤，通过氮化在原料的表面层上形成氮化物层和/或氮固溶体层，以制备含氮原料; 将原料与含氮原料混合以获得含氮混合材料的混合步骤; 将含氮混合材料中的材料彼此粘合并将含氮原料中包含的氮均匀地分散在钛合金构件的整个内部的固溶体形式的烧结步骤，以获得烧结钛合金构件; 对所述烧结钛合金构件进行热塑性加工以获得加工构件的热塑性加工步骤和/或对所述烧结钛合金构件进行热处理以获得处理构件的热处理步骤; 以及向加工构件施加压缩残余应力的表面处理工序。版权所有（C）2013，JPO＆INPIT

7. 发明专利

JP2012087327A High-strength magnesium alloy wire, method for manufacturing the same, high-strength magnesium alloy component, and high-strength magnesium alloy spring 有权
标题翻译：高强度镁合金线，其制造方法，高强度镁合金元件和高强度镁合金弹簧
公开(公告)号：JP2012087327A
公开(公告)日：2012-05-10
申请号：JP2010232364
申请日：2010-10-15
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： ARAOKA YUJI , SHIRAISHI TORU , ONO YOSHIKI
IPC分类号： C22C23/06 , B22F3/14 , B22F3/20 , C22C23/00
CPC分类号： C22C23/00 , B22F3/20 , B22F3/24 , B22F5/12 , B22F2998/00 , B22F2998/10 , C22C23/06 , C22F1/06 , B22F2303/01 , B22F2301/058 , B22F9/08 , B22F3/10
摘要： PROBLEM TO BE SOLVED: To provide a high-strength magnesium alloy wire which has high strength and excellent workability achieved by satisfying both elongation and 0.2% yield strength, also has higher strength near the surface, and is suitable for use in products to which bending stress and/or torsional stress are mainly applied.SOLUTION: The magnesium alloy wire is used in a member to which bending stress and/or torsional stress are mainly applied. In the wire, the surface layer part includes a portion having the maximum hardness of 170 HV or more, and the inside has 0.2% yield strength of 550 MPa or more and an elongation of 5% or more.
摘要翻译：要解决的问题：为了提供通过满足伸长率和0.2％屈服强度而实现的高强度和优异的加工性的高强度镁合金丝线，在表面附近也具有更高的强度，并且适用于产品主要应用弯曲应力和/或扭转应力。
解决方案：镁合金线用于主要施加弯曲应力和/或扭转应力的构件。在线材中，表层部分包括具有最大硬度为170HV或更高的部分，并且内部的屈服强度的0.2％为550MPa以上，伸长率为5％以上。版权所有（C）2012，JPO＆INPIT

8. 发明专利

JP2010137259A Fine metal wire production device and fine metal wire 有权
标题翻译：精细金属丝生产设备和精细金属线
公开(公告)号：JP2010137259A
公开(公告)日：2010-06-24
申请号：JP2008316428
申请日：2008-12-12
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： ARAOKA YUJI , SHIRAISHI TORU , ONO YOSHIKI , FUJII TAKAHIRO
IPC分类号： B22D11/06 , B22D11/00
摘要： PROBLEM TO BE SOLVED: To provide a fine metal wire production device which can prevent the substance components of a raw material holding unit from being mixed in a fine metal wire even in a case of active metals and alloys containing the active metals, thereby can attain long and stable production and a reduction in production costs, and to provide a highly clean low cost fine metal wire thus obtained.
SOLUTION: The raw material holding unit 120 comprises a cylindrical member with a water-cooling mechanism in which a plurality of slits 121A axially extending are formed at the upper end thereof. Thereby, the magnetic flux generated at a heating section 130 passes through the slits 121A, allowing the effective melting of the raw material, also preventing the raw material holding unit from being heated and fused through the magnetic flux. Thus, the fine metal wires without a mixture of the substance components of the raw material holding unit can be obtained.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：即使在含有活性金属的活性金属和合金的情况下，也可以提供一种能够将原料保持单元的物质成分混入精细金属丝中的细金属线制造装置，从而可以实现长期稳定的生产和生产成本的降低，并且提供由此获得的高度清洁的低成本细金属丝。原料保持单元120包括具有水冷机构的圆柱形构件，其中在其上端形成有多个沿轴向延伸的狭缝121A。由此，在加热部130产生的磁通量通过狭缝121A，能够有效地熔化原料，也防止原料保持部通过磁通进行加热熔融。因此，可以获得不含原料保持单元的物质成分的混合物的细金属丝。版权所有（C）2010，JPO＆INPIT

9. 发明专利

JP2009127123A Leaf spring material and manufacturing method thereof 审中-公开
标题翻译：叶片弹簧材料及其制造方法
公开(公告)号：JP2009127123A
公开(公告)日：2009-06-11
申请号：JP2007307312
申请日：2007-11-28
申请人： Horikiri:Kk , Nhk Spring Co Ltd , 日本発條株式会社 , 株式会社ホリキリ
发明人： AYADA TOMOHIKO , ONO YOSHIKI , TAKAHASHI FUMIO , EBASHI HIRONORI , KIKUCHI SAKAE
IPC分类号： C21D9/02 , C21D1/10 , C21D1/18 , F16F1/02
CPC分类号： C21D9/02
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a leaf spring material with which the leaf spring material excellent in mechanical characteristics can stably be obtained by utilizing a high frequency induction-heating.
SOLUTION: The method for manufacturing the leaf spring material is performed while giving the tensile strength along the longitudinal direction on a first surface 11 of a strip-shaped steel sheet 10 and also, giving the compressed stress along the longitudinal direction on a second surface 12, and while the high frequency induction-hardening to the first surface 11 is applied. With this high frequency induction-hardening, the high frequency induction-hardened structure having the higher average hardness than the basic material structure 12a near the second surface and composed of martensite and uniformly and finely dispersed austenite is given on the surface layer 11a near the first surface.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种通过利用高频感应加热可以稳定地获得机械特性优异的板簧材料的板簧材料的制造方法。解决方案：在带状钢板10的第一表面11上沿着纵向施加拉伸强度，同时沿纵向方向施加压缩应力，同时进行板簧材料的制造方法第二表面12，并且施加到第一表面11的高频感应硬化。通过这种高频感应淬火，在靠近第一表面的表面层11a上提供具有比第二表面附近的基本材料结构12a更高的平均硬度的高频感应硬化结构，由马氏体和均匀且细微的分散的奥氏体组成表面。版权所有（C）2009，JPO＆INPIT

10. 发明专利

JP2014055343A Compression coil spring and manufacturing method 有权
标题翻译：压缩线圈弹簧和制造方法
公开(公告)号：JP2014055343A
公开(公告)日：2014-03-27
申请号：JP2012202416
申请日：2012-09-14
申请人： Nhk Spring Co Ltd , 日本発條株式会社
发明人： ONO YUICHIRO , SHIRAISHI TORU , ONO YOSHIKI , TAKAHASHI KEITA
IPC分类号： C22C38/00 , B21F35/00 , B24C1/10 , B24C11/00 , C21D1/06 , C21D7/06 , C21D8/06 , C21D9/02 , C22C38/04 , C22C38/54 , C23C8/22 , F16F1/06
CPC分类号： F16F1/021 , B21F3/02 , B21F35/00 , B24C1/10 , C21D1/06 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D7/06 , C21D8/065 , C21D9/02 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/18 , C22C38/22 , C22C38/24 , C22C38/34 , C22C38/46 , C23C8/02 , C23C8/22 , C23C8/80 , F16F1/06 , F16F2224/0216 , F16F2226/00 , F16F2236/04 , F16F2238/026
摘要： PROBLEM TO BE SOLVED: To provide a compression coil spring having high durability and to provide its manufacturing method.SOLUTION: A compression coil spring uses a steel wire containing, by wt.%, C: 0.45 to 0.80%, Si: 0.15 to 2.50%, Mn: 0.3 to 1.0% and the balance iron with inevitable impurities, and having a circle-equivalent diameter of 2.5 mm to 10 mm, an internal hardness of any wire cross section of 570 to 700 HV, of which surface part contains a C concentrated layer having a C concentration over an average concentration in the steel wire, a compression residual stress of 200 MPa or more at a depth of 0.2 mm from a surface of the wire at the no load and the compression residual stress of 60 MPa or more at the depth of 0.4 mm from the surface in an abbreviated maximum stress direction generated when the compression load is loaded on an inner diameter side of the coil spring of the wire.
摘要翻译：要解决的问题：提供一种耐久性高的压缩螺旋弹簧并提供其制造方法。压缩螺旋弹簧使用含有重量百分比C：0.45至0.80％，Si：0.15至2.50的钢丝％，Mn：0.3〜1.0％，余量为铁，不可避免的杂质，圆当量直径为2.5mm〜10mm，任何线横截面为570〜700HV的内部硬度，其表面部分为 C浓度超过钢丝中的平均浓度的C浓缩层，距离无负荷的线的表面0.2mm的深度处的压缩残余应力为200MPa以上，压缩残余应力为60MPa，在压缩载荷被加载在线圈的螺旋弹簧的内径侧时产生的缩写最大应力方向上距离表面0.4mm的深度更多。

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