WO2019042313A1 - 一种低摩擦系数和低波纹度的金属薄板 - Google Patents

一种低摩擦系数和低波纹度的金属薄板 Download PDF

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Publication number
WO2019042313A1
WO2019042313A1 PCT/CN2018/102932 CN2018102932W WO2019042313A1 WO 2019042313 A1 WO2019042313 A1 WO 2019042313A1 CN 2018102932 W CN2018102932 W CN 2018102932W WO 2019042313 A1 WO2019042313 A1 WO 2019042313A1
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Prior art keywords
pits
metal sheet
low
waviness
friction
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PCT/CN2018/102932
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English (en)
French (fr)
Inventor
陈孝明
李山青
全基哲
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to EP18850306.4A priority Critical patent/EP3677352B1/en
Priority to US16/635,850 priority patent/US11559829B2/en
Priority to JP2020505155A priority patent/JP2020528827A/ja
Priority to KR1020197036036A priority patent/KR20200004863A/ko
Publication of WO2019042313A1 publication Critical patent/WO2019042313A1/zh
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
    • F16S1/00—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
    • F16S1/00—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members
    • F16S1/04—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members produced by deforming or otherwise working a flat sheet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
    • F16S1/00—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members
    • F16S1/04—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members produced by deforming or otherwise working a flat sheet
    • F16S1/06—Sheets, panels, or other members of similar proportions; Constructions comprising assemblies of such members produced by deforming or otherwise working a flat sheet by deforming only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/14—Roughness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12993—Surface feature [e.g., rough, mirror]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component

Definitions

  • the present invention relates to a metal sheet, and more particularly to a metal sheet having a low coefficient of friction and a low waviness.
  • the frictional property between the material and the mold significantly affects the metal flow of the material during the forming process, which further affects the stamping forming property of the material.
  • the surface roughness of the material can also effectively improve the friction between the material and the mold.
  • the principle is material.
  • the microstructure of the surface can store lubricating oil, so that an oil film can be maintained at the contact interface between the mold and the material during stamping to improve the lubrication effect. Therefore, in order to obtain a good lubricating effect, it is required that the surface of the material has a relatively reasonable microstructure, which can well store the lubricating oil and ensure a relatively stable oil film during the stamping process.
  • the publication number is CN103769431A, and the publication date is May 7, 2014.
  • the Chinese patent document entitled "Production Method of Automobile Exterior Panel” discloses a production method of an automobile outer panel.
  • the technical solution disclosed in the patent document is mainly for manufacturing a low-wobble hot-dip galvanized automobile outer panel, which adjusts the roughness of the steel sheet in each process by adjusting the roughness of the rolls in different processes, and finally ensures the finished steel plate. Has a certain roughness and a low waviness.
  • the technical solution disclosed in the patent document mainly optimizes and improves the matching roller process in the rolling flattening process, and achieves the purpose of improving the surface coating effect of the steel plate, and does not involve specific optimization and improvement of the microscopic surface structure.
  • the publication number is CN104884180A, and the publication date is September 2, 2015.
  • the Chinese patent entitled "Plate product made of sheet metal, especially steel, the use of the flat product, the roll, and the method for producing the flat product” The literature relates to flat products made of sheet metal, in particular steel, to advantageous uses and to rolls which are particularly suitable for the manufacture of such flat products, and to methods for producing such flat products.
  • a metal sheet having a surface texture and a specific texture and a manufacturing process thereof are disclosed, and the topography on the sheet has a double I shape, an H shape, a cross shape, and a C shape.
  • the technical problem to be solved by the present invention is to provide a metal foil having a low coefficient of friction and a low waviness which can improve the forming and painting properties of the material.
  • a metal sheet having a low friction coefficient and a low waviness the surface of the metal sheet being provided with a plurality of circular or substantially circular micro-pits, each of the pits having a diameter of 30 to 150 ⁇ m and adjacent pits
  • the amount of overlap is less than 10%; the ratio of the surface area occupied by the pits per square millimeter of the surface of the metal sheet on which the pit is located is greater than 30%, and the difference in the number of pits in the square of any square millimeter of the surface is less than 20%.
  • the surface microstructure is designed as a large number of tiny pits in order to form a "small oil groove" on the surface of the material for storing lubricating oil and improving the stamping forming property of the material; and the overlap between the pits is designed as Less than 10% is to enable the dimples to form "small oil grooves" independent of each other to lock the lubricating oil, and to prevent the lubricating oil from flowing between the dimples to reduce the lubricating effect.
  • the shape of the pit is designed to be circular or nearly circular, on the one hand, it can avoid the directional difference of the surface microstructure of the material, on the other hand, it is beneficial to maintain the relative independence between the pit and the pit; the diameter of the pit It is limited to 30-150 ⁇ m because when the pit diameter is less than 30 ⁇ m, the lubricating oil does not easily enter the pit, and the manufacturing difficulty is increased. When the pit diameter is larger than 150 ⁇ m, the surface microstructure is too coarse. It will reduce the adhesion of the paint film, and at the same time, the microstructure of the paint film will not be completely covered by the paint film, resulting in a decrease in paint performance.
  • the ratio of the area occupied by the pits per square millimeter is limited to more than 30% because if the proportion of the occupied area is less than 30%, the number of pits is too small, and the pit distribution is too sparse, which may result in the surface of the material.
  • the oil storage performance is insufficient and the adhesion between the paint film and the material is lowered.
  • the difference in the number of pits per square millimeter is designed to be less than 20% because the difference in the number of pits per unit area is larger, the uniformity of the surface microstructure is worse, the waviness of the surface of the material is increased, and the painted surface is painted. The effect is also worse;
  • the one side or both side surfaces of the metal thin plate are provided with the pits.
  • the amount of overlap between adjacent pits is less than 5%.
  • the amount of overlap between adjacent pits is preferably zero.
  • the proportion of the surface area occupied by the pits per square millimeter of the surface of the metal sheet on which the pit is located is greater than 50%.
  • the difference in the number of pits in the square of any unit square mm of the surface of the metal sheet on which the pit is located is less than 10%.
  • the difference in the number of pits in the square of any unit square mm of the surface of the metal sheet on which the pit is located is less than 5%.
  • the metal foil with low friction coefficient and low waviness adopting the above technical solution can effectively reduce the friction coefficient and the waviness by improving the surface microstructure reasonably, thereby improving the forming and painting performance of the material.
  • Figure 1 is a view showing the surface microstructure of the metal thin plate in Embodiment 1 of the present invention.
  • Figure 2 is a view showing the surface microstructure of the metal thin plate in Embodiment 2 of the present invention.
  • Figure 3 is a view showing the surface microstructure of the metal thin plate in Embodiment 3 of the present invention.
  • Figure 4 is a view showing the surface microstructure of the metal thin plate in Comparative Example 1 of the present invention.
  • Figure 5 is a view showing the surface microstructure of the metal thin plate in Comparative Example 2 of the present invention.
  • Figure 6 is a view showing the surface microstructure of the metal thin plate in Comparative Example 3 of the present invention.
  • Figure 7 is a view showing the structure of a drawbead tester for measuring the coefficient of friction
  • Fig. 7 The meanings of the reference numerals in Fig. 7 are: 1-upper head, 2-drawing arm, 3-lower head, 4-sample.
  • the present invention proposes a metal sheet having a low friction coefficient and a low waviness, and the surface microstructure of the metal sheet has the following characteristics:
  • the surface microstructure consists of a large number of tiny pits; the overlap between adjacent pits is less than 10%; the shape of the pits is circular or approximately circular, and the diameter is 30-150 ⁇ m; the pits per square millimeter The proportion of occupied area is greater than 30%; the difference in the number of pits in any square mm of the sheet is less than 20%.
  • Examples 1-3 are hot-dip galvanized steel sheets having a surface microstructure having the technical features of the present invention
  • Comparative Examples 1-3 are hot-dip galvanized steel sheets having ordinary surfaces
  • specific surface microstructure parameters of the respective examples and comparative examples are shown in the following table. 1, in which the comparative example is randomly undulating due to its microscopic structure, it is difficult to accurately distinguish the convex and concave pits, so it is difficult to count the pit diameter, the number of pits and the proportion of the pit area, wherein Figures 1-6 correspond to the implementation Surface microstructures of Examples 1-3 and Comparative Examples 1-3.
  • Examples 1 to 3 and Comparative Examples 1 to 3 were tested according to the measurement standard ISO 4287:1997.
  • the filter was Gaussian filtered, wherein the sampling length of the roughness Ra was 0.8 mm, and the sampling length of the waviness Wa was 40mm, filter interval 0.8 ⁇ 8mm.
  • the friction coefficients of Examples 1 to 3 and Comparative Examples 1 to 3 were measured and compared using the drawbead tester shown in Fig. 7.
  • Example 1 Example 2
  • Example 3 Comparative example 1 Comparative example 2 Comparative example 3
  • Roughness 1.02 ⁇ m 1.06 ⁇ m 0.98 ⁇ m 1.03 ⁇ m 1.02 ⁇ m 0.96 ⁇ m Waviness 0.183 ⁇ m 0.193 ⁇ m 0.211 ⁇ m 0.246 ⁇ m 0.235 ⁇ m 0.251 ⁇ m
  • Coefficient of friction 0.119 0.112 0.121 0.130 0.127 0.132

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)

Abstract

一种低摩擦系数和低波纹度的金属薄板，该金属薄板的表面布设有多个圆形或大致为圆形的微小凹坑，单个所述凹坑的直径为30～150μm，相邻凹坑间的重叠量小于10％；凹坑所处的金属薄板表面每平方毫米内凹坑所占据该表面表面积的比例大于30％，并且该表面任意单位平方毫米内的凹坑数量差异小于20％。通过对表面微观结构的合理优化设计，可以有效降低摩擦系数和波纹度，从而改善材料的成形和涂漆性能。

Description

一种低摩擦系数和低波纹度的金属薄板 技术领域
本发明涉及一种金属薄板，尤其涉及一种低摩擦系数和低波纹度的金属薄板。
背景技术
在金属薄板材料冲压成形时，材料和模具之间的摩擦特性会显著影响材料在成形过程中的金属流动，进一步会影响材料的冲压成形性能。为减少材料和模具之间的摩擦，除在材料表面涂敷一些具有润滑特性的涂层外，使材料表面具有一定的粗糙度也能有效改善材料与模具之间的摩擦特性，其原理是材料表面的微观结构可以存储润滑油，这样在冲压成形时可以在模具与材料的接触界面保持一层油膜，改善润滑效果。因此，为获得良好的润滑效果，需要材料表面具有一个较为合理的微观结构，其能很好的存储润滑油并能保证在冲压成形过程中保持一个相对稳定的油膜。
在材料表面进行涂漆时，材料的表面微观结构会影响涂漆后的漆面效果，具体而言，由于漆膜对材料表面的微观起伏遮盖能力有限，材料表面的微观结构会传递到漆面上，特别是材料表面的波纹度，因此为了获得好的漆面效果，通常需要材料表面具有尽量低的波纹度。
公开号为CN103769431A，公开日为2014年5月7日，名称为“一种汽车外板的生产方法”的中国专利文献公开了一种汽车外板的生产方法。该专利文献所公开的技术方案主要为制造低波纹度热镀锌汽车外板的生产方法，其通过调整不同工序的轧辊粗糙度，合理控制各个工序过程中的钢板表面粗糙度，最终保证成品钢板具有一定的粗糙度同时有较低的波纹度。然而，该专利文献所公开的技术方案其主要是对轧制平整过程中的配辊工艺进行了优化改进，达到改善钢板表面涂装效果的目的，未涉及对微观表面结构的具体优化改进内容。
公开号为CN104884180A，公开日为2015年9月2日，名称为“由金属薄板特别是钢材制成的平板产品、该平板产品的用途、辊以及用于生产该平板产品的方法”的中国专利文献涉及由金属薄板特别是钢材制成的平板产品，涉及 有利的用途并且涉及特别适用于制造该种平板产品的辊，以及涉及用于生产该种平板产品的方法。在该专利文献所公开的技术方案中，其公开了一种表面形貌具有特定纹理的金属板材及其制造工艺，其板材上的形貌通过使用具有双I形、H形、十字形、C形或X形确定性纹理的轧辊轧制而来，其表面纹理特征在于RPc值范围45～180个/cm，Ra值范围0.3～3.6μm，Wsa值范围在0.05～0.65μm。然而，该专利文献所公开的技术方案虽然对表面微观结构进行了一定的优化设计，但并未针对材料表面润滑性能做出明显改善，而且其规则的表面形貌在涂装时容易产生“莫尔纹”缺陷。
即，现有技术中还未发现有通过改善和控制材料表面微观结构来改善材料表面润滑和涂漆性能的技术。
发明内容
本发明所要解决的技术问题在于提供一种可改善材料的成形和涂漆性能的低摩擦系数和低波纹度的金属薄板。
其所要解决的技术问题可以通过以下技术方案来实施。
一种低摩擦系数和低波纹度的金属薄板，该金属薄板的表面布设有多个圆形或大致为圆形的微小凹坑，单个所述凹坑的直径为30～150μm，相邻凹坑间的重叠量小于10％；凹坑所处的金属薄板表面每平方毫米内凹坑所占据该表面表面积的比例大于30％，并且该表面任意单位平方毫米内的凹坑数量差异小于20％。
其中，将表面微观结构设计为大量的微小凹坑是为了在材料表面形成一个个“小油槽”用来存储润滑油，改善材料的冲压成形性能；而将各凹坑之间的重叠量设计为小于10％是为了使各凹坑能够形成彼此相互独立的“小油槽”来锁住润滑油，避免润滑油在凹坑之间流动降低润滑效果。
将凹坑形状设计为圆形或近似圆形，一方面是可以避免材料表面微观结构出现方向性差异，另一方面有利于保持凹坑与凹坑之间的相对独立；将凹坑的直径大小限定为30～150μm是因为当凹坑直径小于30μm时，会导致润滑油不容易进入到凹坑内，且增加了生产制造难度，而当凹坑直径大于150μm时，会导致表面微观结构过于粗大，会降低漆膜的附着力，同时在涂装时其微观结构 也不易被漆膜完全遮盖，导致涂漆性能下降。
另外，将每平方毫米内凹坑所占据面积的比例限定在大于30％是因为若所占据面积的比例小于30％，会导致凹坑数量过少，凹坑分布过于稀疏，会导致材料表面的储油性能不足，且漆膜与材料之间的附着力下降。将单位平方毫米内的凹坑数量差异设计为小于20％是因为单位面积的凹坑数量差异越大，表面微观结构的均匀性越差，材料表面的波纹度会增加，涂漆后的漆面效果也变差；
作为本技术方案的进一步改进，所述金属薄板的单侧或两侧表面布设有所述凹坑。
也作为本技术方案的进一步改进，相邻凹坑间的重叠量小于5％。其中，相邻凹坑间的重叠量优选为0。
还作为本技术方案的进一步改进，凹坑所处的金属薄板表面每平方毫米内凹坑所占据该表面表面积的比例大于50％。
同样作为本技术方案的进一步改进，凹坑所处的金属薄板表面任意单位平方毫米内的凹坑数量差异小于10％。
作为本技术方案的更进一步改进，凹坑所处的金属薄板表面任意单位平方毫米内的凹坑数量差异小于5％。
采用上述技术方案的低摩擦系数和低波纹度的金属薄板，通过对表面微观结构的合理优化设计，可以有效降低摩擦系数和波纹度，从而改善材料的成形和涂漆性能。
附图说明
图1示意了本发明实施例1中的金属薄板表面微观结构；
图2示意了本发明实施例2中的金属薄板表面微观结构；
图3示意了本发明实施例3中的金属薄板表面微观结构；
图4示意了本发明对比例1中的金属薄板表面微观结构；
图5示意了本发明对比例2中的金属薄板表面微观结构；
图6示意了本发明对比例3中的金属薄板表面微观结构；
图7示意了用于测量摩擦系数的拉延珠试验机的结构图；
其中图7中标号的含义为：1-上压头，2-拉延臂，3-下压头，4-试样。
具体实施方式
下面结合附图和具体的实施例对本发明的具体实施方式进行进一步的详细说明。
本发明的目的在于提供一种低摩擦系数和低波纹度的金属薄板，其通过对表面微观结构的合理优化设计，可以有效降低摩擦系数和波纹度，从而改善材料的成形和涂漆性能。
为了实现上述目的，本发明提出了一种低摩擦系数和低波纹度的金属薄板，所述金属薄板的表面微观结构具有以下特征：
表面微观结构由大量的微小凹坑组成；相邻凹坑之间的重叠量小于10％；凹坑形状为圆形或近似为圆形，直径大小在30～150μm；每平方毫米内凹坑所占据面积的比例大于30％；薄板任意单位平方毫米内的凹坑数量差异小于20％。
即，为改善材料表面的涂漆效果，需要对材料表面的微观形貌进行设计，使得其在一定粗糙度的基础上具有尽量低的波纹度。
下面将结合说明书附图和具体的实施例及对比例对本发明所述的一种低摩擦系数和低波纹度的金属薄板做进一步的解释和说明，该解释和说明并不对本发明的技术方案构成不当限定。
实施例1-3及对比例1-3
实施例1-3为表面微观结构具有本发明技术特征的热镀锌钢板，而对比例1-3为普通表面的热镀锌钢板，各实施例及对比例的具体表面微观结构参数参见下表1，其中对比例因其微观结构为随机起伏，难以对凸台和凹坑进行准确区分，因此难以统计凹坑直径、凹坑数量及凹坑面积占比，其中图1-6分别对应于实施例1-3和对比例1-3的表面微观结构。
表1：
  微观结构 凹坑形状 凹坑直径 凹坑面积占比 凹坑数量
实施例1 散布凹坑 圆形 约80μm 60％ 130个/mm 2
实施例2 散布凹坑 圆形 约100μm 62％ 110个/mm 2
实施例3 散布凹坑 圆形 约100μm 71％ 90个/mm 2
对比例1 随机起伏 不规则 - - -
对比例2 随机起伏 不规则 - - -
对比例3 随机起伏 不规则 - - -
依照测量标准ISO 4287:1997对实施例1～3及对比例1～3粗糙度和波纹度进行测试，滤波器采用高斯滤波，其中粗糙度Ra的取样长度为0.8mm，波纹度Wa取样长度为40mm，滤波区间0.8～8mm。再采用附图7所示拉延珠试验机对实施例1～3和对比例1～3的摩擦系数进行测量对比，具体采用的试验参数为：试样4位于上压头1和下压头3之间，上压头1压力为1500N，拉延臂2对试样4的拉延速度为150mm/min，拉延距离为100mm，试样4尺寸均为25×400mm，样板涂油量1.0g/m 2。
下表2罗列的试验数据结果表明，材料微观表面形貌具有本发明技术特征的实施例1～3相比于对比例1-3具有明显低的摩擦系数和波纹度。
表2：
  实施例1 实施例2 实施例3 对比例1 对比例2 对比例3
粗糙度 1.02μm 1.06μm 0.98μm 1.03μm 1.02μm 0.96μm
波纹度 0.183μm 0.193μm 0.211μm 0.246μm 0.235μm 0.251μm
摩擦系数 0.119 0.112 0.121 0.130 0.127 0.132
需要注意的是，以上列举的仅为本发明的具体实施例，显然本发明不限于以上实施例，随之有着许多的类似变化。本领域的技术人员如果从本发明公开的内容直接导出或联想到的所有变形，均应属于本发明的保护范围。

Claims (7)

  1. 一种低摩擦系数和低波纹度的金属薄板，其特征在于，该金属薄板的表面布设有多个圆形或大致为圆形的凹坑，单个所述凹坑的直径为30～150μm，相邻凹坑间的重叠量小于10％；凹坑所处的金属薄板表面每平方毫米内凹坑所占据该表面表面积的比例大于30％，并且该表面任意单位平方毫米内的凹坑数量差异小于20％。
  2. 根据权利要求1所述低摩擦系数和低波纹度的金属薄板，其特征在于，所述金属薄板的单侧或两侧表面布设有所述凹坑。
  3. 根据权利要求1所述低摩擦系数和低波纹度的金属薄板，其特征在于，相邻凹坑间的重叠量小于5％。
  4. 根据权利要求1或3所述低摩擦系数和低波纹度的金属薄板，其特征在于，相邻凹坑间的重叠量为0。
  5. 根据权利要求1所述低摩擦系数和低波纹度的金属薄板，其特征在于，凹坑所处的金属薄板表面每平方毫米内凹坑所占据该表面表面积的比例大于50％。
  6. 根据权利要求1所述低摩擦系数和低波纹度的金属薄板，其特征在于，凹坑所处的金属薄板表面任意单位平方毫米内的凹坑数量差异小于10％。
  7. 根据权利要求6所述低摩擦系数和低波纹度的金属薄板，其特征在于，凹坑所处的金属薄板表面任意单位平方毫米内的凹坑数量差异小于5％。
PCT/CN2018/102932 2017-08-29 2018-08-29 一种低摩擦系数和低波纹度的金属薄板 Ceased WO2019042313A1 (zh)

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