US20110212343A1 - Method for producing steel fibers - Google Patents

Method for producing steel fibers Download PDF

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Publication number
US20110212343A1
US20110212343A1 US13/002,734 US200913002734A US2011212343A1 US 20110212343 A1 US20110212343 A1 US 20110212343A1 US 200913002734 A US200913002734 A US 200913002734A US 2011212343 A1 US2011212343 A1 US 2011212343A1
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United States
Prior art keywords
steel
fiber
strip
webs
separation
Prior art date
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Abandoned
Application number
US13/002,734
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English (en)
Inventor
Karl-Hermann Stahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cent & Cent GmbH and Co KG
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Cent & Cent GmbH and Co KG
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Assigned to CENT & CENT GMBH & CO KG reassignment CENT & CENT GMBH & CO KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STAHL, KARL-HERMANN
Publication of US20110212343A1 publication Critical patent/US20110212343A1/en
Abandoned legal-status Critical Current

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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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
    • B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P17/00—Metal-working operations, not covered by a single other subclass or another group in this subclass
    • B23P17/04—Metal-working operations, not covered by a single other subclass or another group in this subclass characterised by the nature of the material involved or the kind of product independently of its shape
    • B23P17/06—Making steel wool or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/48—Metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/012—Discrete reinforcing elements, e.g. fibres
    • 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
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/10—Methods
    • Y10T225/12—With preliminary weakening
    • 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
    • Y10T428/1234—Honeycomb, or with grain orientation or elongated elements in defined angular relationship in respective components [e.g., parallel, inter- secting, etc.]
    • 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
    • Y10T428/12444—Embodying fibers interengaged or between layers [e.g., paper, etc.]

Definitions

  • the invention concerns a method of making steel fibers, preferably for use as a concrete additive, and for the supply thereof in making steel fiber concrete. It has proven to be advantageous in many areas of use to add steel fibers to concrete instead of or in addition to the usual structural steel mats, where in particular the formation of microcracks in the new concrete is prevented. In addition the simple processing affords enormous labor savings and gives the concrete a longer service life. Depending on the application it is also possible to achieve higher tensile and flex strength as well as a higher load-bearing capacity.
  • the object of the invention is to provide a method of the kind set forth in the introduction of this specification, which permits simple and inexpensive production of steel fibers.
  • a sheet-metal strip is notched either on one face or both faces so as to form steel-fiber wires that are initially connected together by webs, and that further, for subsequently converting the webs into thin easily mutually separable separation webs forming separation surfaces that are fracture-rough and low in burring upon separation, the steel-fiber strip is subjected to a flexing process in which each web is subjected to multiple bending deformations about its longitudinal axis in such a way that incipient cracks are produced at the webs due to fatigue fracture and thus the separation webs are produced.
  • the advantage achieved by the invention is essentially that a sheet-metal strip is used as the starting material for the steel fibers, so that not only is an advantageous starting material available, but in addition shaping of a multiplicity of steel-fiber wires can be done.
  • the steel-fiber wires in the notching operation being provided with anchor formations formed by interruptions in the notching operation.
  • Those anchor formations thus represent local cross-sectional enlargements due to upsetting in the notching operation and relative to the notched cross-section of the steel fibers.
  • Those interruptions can be provided relative to the notching projections in the rolling tool so that making steel-fiber wires with anchor formations is possible in one working step, with positioning of the anchor formations at the ends of the steel fibers being particularly effective.
  • the method is performed in such a way that the steel-fiber wires are shaped to extend transversely to the longitudinal direction of the sheet-metal strip.
  • this procedure involves the possibility of the steel-fiber strips being wound up after complete manufacture thereof.
  • the steel-fiber strip is in the form of a coil, a large amount of steel fibers are in ordered relationship and can be easily and quickly separated and made available in a compact and readily transportable fashion for transport to the position of use thereof. Therefore the invention further provides that separation of the steel-fiber strips to form steel fibers is carried out at the location of concrete preparation. In that way it is possible to dispense with equipment and measures with which nowadays “clumping” (lump formation of steel fibers in the concrete) is to be avoided. It will be appreciated that it is also possible for the separation operation to be performed in the production line if that is desirable or necessary.
  • steel-fiber wires can also be shaped to extend longitudinally of the sheet-metal strip.
  • the upper face and/or the lower face of the strip can be easily roughened by knurling, in which case however that is also possible in comparable fashion in respect of the above-described alternative with steel-fiber wires extending transversely to the longitudinal direction of the sheet-metal strip. That makes it possible to achieve better adhesion in the concrete.
  • the steel-fiber strip could optionally be wound into a coil and the subsequent method steps could then be implemented at the location of concrete preparation with a suitable piece of equipment.
  • the method further provides that then the steel-fiber wires oriented longitudinally of the strip are separated from each other.
  • the steel-fiber wires are subjected by a shaping tool to a shaping operation corresponding to the intended use. That can involve producing a crooked shape of the steel-fiber ends, a wave-shaped configuration extending longitudinally, or the like.
  • Notching of the sheet-metal strip is advantageously effected in a V-shape, so that a notch apex angle W should be between 30° and 120°. In that respect a notch apex angle W of about 60° has proven to be particularly advantageous.
  • the thickness of the web should advantageously be 20% to 95% of the thickness of the strip.
  • the depth of the V-shaped notches is advantageously so selected that it corresponds to the strength of the sheet-metal strip and the intended use of the steel fibers.
  • the flexing process includes multiple bending deformation to one side of the plane of the steel-fiber strip, until incipient fatigue-fracture cracks form in the webs at the notch bottoms.
  • the flexing process can also include multiple bending deformation to both sides of the plane of the steel-fiber strip, until incipient fatigue-fracture cracks form at the webs at the notch bottoms.
  • the flexing process can take place in such a way that multiple bending deformation of the webs is done through equal angles in each case.
  • the multiple bending deformation of the webs is done to one or both sides through increasing or also decreasing angles.
  • multiple bending deformation of the webs should be effected at an angle less than the notch angle.
  • the separation web can be broken by slight, oppositely directed deflection of immediately juxtaposed steel-fiber wires. More specifically in the case of steel fibers that extend transversely to the strip direction, the separation web can be severed in a separation apparatus like a zip fastener and thus the steel fibers can be individually separated while, in the case of the steel-fiber wires that extend longitudinally of the strip, the separation operation is carried out by shaping rollers by slight, oppositely directed deflection of immediately adjacent steel-fiber wires and thereafter the steel fiber is shaped and cut to length.
  • Preferably semifinished material of metal in strip form is used as the starting material.
  • the object of the invention is attained by a steel-fiber strip of metal that has a plurality of mutually parallel steel-fiber wires connected together by webs and produced in accordance with at least one of the preceding method claims, characterized in that semifinished material in strip form is used as starting material and for forming the steel-fiber wires is notched on one face or on both faces and in the notching operation is provided with anchor formations, the webs being converted by multiple bending deformations by a flexing process to provide thin, easily separable separation webs that form low-burring and fracture-rough separation surfaces upon separation and that have fatigue fractures or incipient fatigue-fracture cracks and the steel-fiber wires and the steel-fiber strips are subjected to a shaping operation, steel fibers suitable as an additive to concrete being formed in the separation operation of the steel-fiber strips or the steel-fiber wire strips.
  • separation webs Incipient fatigue-fracture cracks are produced at the notch bottoms by the flexing process so that the webs are weakened.
  • the remaining web residues referred to as separation webs—can be very thin because they are at the neutral fiber of the bending operation; the steel-fiber wires can thus be later easily separated from each other into individual fibers.
  • the metallic starting material can also be coated in the from of metal strips, in particular galvanized or copper-plated steel strip. It is desirable in that respect in particular that the metallic material involved is materials with which—if required—particularly high strength values can also be achieved by rolling, for the respective group of materials.
  • the invention concerns a steel fiber produced in accordance with the above-described method. It is characterized in that it is formed from semifinished material in strip form that is used as the starting material and that, for forming steel-fiber wires that are initially still connected together by webs, is notched on one face or on both faces and is provided with anchor formations in the notching operation, the webs being converted by multiple bending deformations by a flexing process to provide thin separation webs that form easily mutually separable separation surfaces that have low burring, are fracture-rough upon separation, and have a fatigue fracture.
  • steel fiber forms a completely novel type of steel fiber.
  • the steel fiber is of a shape suitable for addition to concrete.
  • FIG. 1 is a diagrammatic view of the procedure according to the invention in a first embodiment with a steel-fiber wire extending transversely of the strip direction,
  • FIG. 2 shows a view corresponding to FIG. 1 of the procedure in an alternative configuration, with a steel-fiber wire extending longitudinally of the strip direction,
  • FIG. 3 shows a detail view of the notching roll, shown in developed form
  • FIG. 4 shows a cross section through a notched strip of which only part is shown and that is intended for making the steel-fiber strip or steel-fiber wire strip, with notching already done
  • FIG. 5 shows the notched strip subjected to flexing and intended for making the steel-fiber strip or the steel-fiber wire strip when bent, in FIG. 5 a for steel-fiber wires extending longitudinally of the strip direction and in FIG. 5 b for steel-fiber wires extending transversely of the strip direction,
  • FIG. 6 shows a system for severing the separation webs of the steel-fiber strip or steel-fiber wire strip
  • FIG. 7 shows an only partial view in section through the wire strip at a notch
  • FIG. 8 shows a separation apparatus for separating the steel fibers
  • FIG. 9 shows different views of an individual steel fiber
  • FIG. 10 shows a different configuration of individual steel fibers
  • FIG. 11 shows a steel fiber with an end cross-sectional enlargement in comparison with the cross-section of the steel fiber.
  • the method diagrammatically shown in the drawing, in particular in FIGS. 1 and 2 serves for making steel fibers 2 that are preferably used as a concrete additive.
  • a sheet-metal strip 1 is notched either on one face or on both faces between rollers 3 , thereby forming steel-fiber wires 4 having anchor formations 7 .
  • the steel-fiber wires 4 are to start with still connected together by webs 5 , as can be seen from FIG. 4 .
  • the steel-fiber strip formed by the steel-fiber wires 4 is flexed such that each web 5 is subjected to multiple flexings about its longitudinal axis as indicated in the drawing at 6 .
  • This way the regions of the webs 5 are formed with incipient cracks, due to fatigue fracture, and the separation webs are produced.
  • incipient scratching of the surface is done between the notches so that fatigue fracture is also triggered there to extend the bases of the notches.
  • the steel-fiber wires 4 can also be provided with anchor formations 7 in the form of cross-sectional enlargements relative to the steel fiber cross-section, as can be seen from FIGS. 3 and 9 . They serve for better anchoring the steel fibers 2 in the concrete and can be positioned at the appropriate location, corresponding to the intended use. In FIG. 9 the flexing fracture surface is also shown at 15 .
  • the steel-fiber wires 4 extend transversely to the longitudinal direction of the sheet-metal strip 1 .
  • they can either extend over the entire width of the sheet-metal strip 1 ; it is however also possible to provide separating blades 8 that subdivide the steel-fiber wire strip 1 into two or more steel-fiber substrips. That subdivision of the steel-fiber wire strip is desirably done prior to the flexing process.
  • the steel-fiber wire strip or strips pass through a shaping roller 9 that imparts to the steel fibers 4 a shape corresponding to the later intended use.
  • the ends of the steel fibers 2 can be for example of a crooked configuration; similarly the steel fibers 2 can be converted into a wavy shaped or shaped in some other suitable fashion.
  • the shape of the steel fiber ends can be altered, more specifically in the nature of an enlargement, as indicated in FIG. 11 . That enlargement or thickening leads to particularly effective anchoring in the concrete.
  • the steel-fiber strips are wound into a coil so that they can be transported to the later position of use easily and in a space-saving fashion.
  • the step of separating the steel-fiber strips to obtain steel fibers 2 is thus carried out only at the location of concrete preparation, and for that purpose an individual separator as shown in FIG. 8 can be used.
  • This is a high-speed toothed wheel 10 that separates the individual steel fibers 2 .
  • This further gives the advantage that, when the step of separating the steel fibers from one another is done at the concrete preparation location, the individual steel fibers 2 can be more homogeneously introduced into the concrete while otherwise—if the steel fibers 2 are supplied in already separated form—they have a tendency to “clumping” and thus result possibly in irregular distribution in the concrete.
  • the steel-fiber wires 4 extending longitudinally of the strip are separated from each other at 12 .
  • the shaping operation is then again done by means of a special shaping tool 13 which imparts to the steel fibers 2 the shaping required for the later use.
  • the steel-fiber wires 4 are cut to the desired length for example by rotary shears 14 so that the steel fibers 2 can be packaged in separated condition and taken to the later location of use.
  • the steel-fiber wire strip can also be wound up into a coil after the flexing process and the operation of separating the steel fibers can then be carried out by a suitable piece of equipment that separates, shapes and cuts them to length, at the location of concrete preparation.
  • Notching the sheet-metal strip 1 is effected in a V-shape, the notch angle W being between 30° and 120°, a notch angle W of about 60° being preferred.
  • the thickness of the initially remaining web 5 is in this case usually 20% to 95% of the thickness of the strip 1 .
  • the depth of the V-shaped notches is advantageously so selected that it corresponds to the strength and purpose of use of the steel fibers.
  • the flexing process can take place in different ways; thus it is first conceivable that only multiple flexing deformation to one side relative to the plane of the steel-fiber strip 1 is done until fatigue fracture occurs at the webs 5 . Equally however the flexing process can also entail multiple flexing deformation to both sides with respect to the plane of the steel-fiber strip, in which case the multiple flexing deformation of the webs 5 can either be done by identical angular amounts or however through increasing or decreasing angles. Details in that respect are also to be found in particular in FIGS. 5 a and 5 b.
  • the separation webs in the case of the longitudinally oriented steel fibers are then broken locally transversely relative to the strip 1 by slight, oppositely directed deflection of immediately adjacent steel-fiber wires, which can be carried out by suitable shaping rollers and is shown in FIG. 6 .
  • the separation operation is done in the separator ( FIG. 8 ) as the last method step.
  • the starting material used is semifinished metal in strip form, in which case in particular high-quality steel- or iron-based materials in all strength standard on the market are recommended.
  • coated metal strips in particular galvanized or copper-plated steel strip.
  • the metallic material preferably is a material with which particularly high strength values can also be achieved by rolling, for the particular material group.
  • a steel fiber produced in accordance with the above-described method is also the subject of the invention. It is formed from semifinished material in strip form as the starting material, and, to produce steel-fiber wires 4 that are initially connected together by webs 5 , is notched on one or both faces. In the notching operation they are provided with anchor formations.
  • the anchor formations are regions of larger cross-section of the steel fibers, which have been left by the notching operation by virtue of a suitable tool configuration and which are even still somewhat upset in the notching operation.
  • the anchor formations are preferably positioned at the ends of the steel fibers, in that respect there also being the possibility of transversely extending steel fibers also being notched such that their transverse ends are also upset.
  • the webs 5 are subjected to incipient cracking on both faces due to fatigue fracture by virtue of multiple bending deformations by a flexing process and the web residue—the separation web—is later separated practically without deformation so that the separation surfaces have a low degree of burring and are fracture-rough.
  • the upper face and the lower face of the steel fibers can also be knurled and in addition the steel fiber can be provided with a shape suitable for addition to concrete and the intended use.
US13/002,734 2008-07-23 2009-05-23 Method for producing steel fibers Abandoned US20110212343A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200810034250 DE102008034250A1 (de) 2008-07-23 2008-07-23 Verfahren zur Herstellung von Stahlfasern
DE10-2008-034-250.5 2008-07-23
PCT/DE2009/000736 WO2010009687A1 (de) 2008-07-23 2009-05-23 Verfahren zur herstellung von stahlfasern

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US14/631,297 Active US9630226B2 (en) 2008-07-23 2015-02-25 Method for producing steel fibers

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EP (1) EP2310165B1 (de)
JP (1) JP5432256B2 (de)
KR (1) KR101606952B1 (de)
CN (1) CN102105262B (de)
AT (1) ATE551148T1 (de)
AU (1) AU2009273628B2 (de)
BR (1) BRPI0916384B1 (de)
CA (1) CA2730702C (de)
DE (1) DE102008034250A1 (de)
DK (1) DK2310165T3 (de)
EA (1) EA018742B1 (de)
EG (1) EG26197A (de)
ES (1) ES2385187T3 (de)
GE (1) GEP20146027B (de)
HR (1) HRP20120357T1 (de)
IL (1) IL210654A (de)
MX (1) MX2011000731A (de)
MY (1) MY159987A (de)
PL (1) PL2310165T3 (de)
PT (1) PT2310165E (de)
RS (1) RS52320B (de)
SI (1) SI2310165T1 (de)
UA (1) UA101387C2 (de)
WO (1) WO2010009687A1 (de)
ZA (1) ZA201100886B (de)

Cited By (8)

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Publication number Priority date Publication date Assignee Title
US20100129678A1 (en) * 2007-05-04 2010-05-27 Karl-Hermann Stahl Method of making strip formed by web-connected wires
US8771837B2 (en) 2009-10-08 2014-07-08 Cent & Cent Gmbh & Co. Kg Metal fiber with chamfered longitudinal corners
US8871020B2 (en) 2009-06-12 2014-10-28 Nv Bekaert Sa High elongation fibres
US8962150B2 (en) 2010-12-15 2015-02-24 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least two bent sections
US9045901B2 (en) 2009-06-12 2015-06-02 Nv Bekaert Sa High elongation fibre with good anchorage
US9180602B2 (en) 2010-09-08 2015-11-10 Hacanoka Gmbh Method of and apparatus for making mesh-like metal mats
US9435122B2 (en) 2010-12-15 2016-09-06 Nv Bekaert Sa Steel fibre for reinforcing concrete or mortar having an anchorage end with at least three straight sections
US9630226B2 (en) 2008-07-23 2017-04-25 Cent & Cent Gmbh & Co. Kg Method for producing steel fibers

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CN102877341A (zh) * 2011-07-16 2013-01-16 符竹娟 钢纤维材料的加工设备
DE102011115434B3 (de) * 2011-10-08 2013-01-17 Hacanoka Gmbh Verfahren zur Fertigung von Draht und Drahtprodukten
DE102012214137A1 (de) * 2012-08-09 2014-02-13 Sms Siemag Ag Vorrichtung zum Besäumen von Walzgut
CN104741411A (zh) * 2013-12-30 2015-07-01 威建企业有限公司 钢片及钢纤维线滚压成型方法
KR101596246B1 (ko) 2014-09-24 2016-02-22 (주)코스틸 시멘트계 재료 보강용 아치형 강섬유
DE102017006298A1 (de) 2016-11-15 2018-05-17 Hacanoka Gmbh Profilierte Metallfaser
CN107716790A (zh) * 2017-10-26 2018-02-23 吉林建筑大学 一种生产端钩型钢纤维的方法
JP7329666B2 (ja) 2018-03-09 2023-08-18 小松マテーレ株式会社 コンクリート補強用繊維強化複合材料、コンクリート構造物
JP7101498B2 (ja) * 2018-03-09 2022-07-15 小松マテーレ株式会社 コンクリート補強用繊維強化複合材料、コンクリート構造物
CN108655676B (zh) * 2018-06-12 2019-08-02 湖北瑞特威钢棉有限公司 环保光绘金属纤维及其制备方法与应用
CA3126452A1 (en) * 2019-01-10 2020-07-16 The Regents Of The University Of Michigan Striated fiber-based concrete reinforcement
DE102021001946A1 (de) * 2021-04-14 2022-10-20 Hacanoka Gmbh Verfahren zur Herstellung von Metallfasern, insbesondere von Stahlfasern
CN113580088B (zh) * 2021-09-28 2021-12-07 南通际维机电设备有限公司 一种具有防机油污染功能的汽车检修用机柜
CN113896477B (zh) * 2021-10-28 2022-07-26 华南理工大学 一种含铣削型钢纤维的超高性能混凝土及其应用

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