CN207564744U - Saw silk - Google Patents

Saw silk Download PDF

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Publication number
CN207564744U
CN207564744U CN201720827995.8U CN201720827995U CN207564744U CN 207564744 U CN207564744 U CN 207564744U CN 201720827995 U CN201720827995 U CN 201720827995U CN 207564744 U CN207564744 U CN 207564744U
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China
Prior art keywords
zinc
saw silk
iron alloys
silk
saw
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CN201720827995.8U
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Chinese (zh)
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D·赫吉克曼
F·诺普
N·帕瑞拉
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Jiangyin Bekaert Alloy Materials Co Ltd
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Jiangyin Bekaert Alloy Materials Co Ltd
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Abstract

A kind of saw silk (10) has line footpath of the range from 40 μm to 300 μm and with the tensile strength for being higher than 2500MPa.Saw silk has the zinc-iron alloy layer (14) partly covered with zinc coating (16).The volume of zinc-iron alloy layer (14) accounts for zinc coating (16) and zinc-iron alloy layer (14) total volume is more than 50 percent.The zinc powder that the saw silk reduction of the utility model generates during drawing, alloy-layer greatly enhances the adhesion strength to steel, since alloy-layer is harder than zinc, also reduces the amount of zinc powder and enhances dissection.

Description

Saw silk
Technical field
The utility model is related to the saw silks with specific coating.
Background technology
Saw silk is widely used in cutting silicon chip.These saw silks must have high tensile and must be thin, to minimize Kerf loss.
Saw silk be generally provided with Brass coating, i.e. yellow brass coatings because Brass coating during final drawing or More or less play the role of lubricant, and therefore allow the contraction for reaching the high level needed for high tensile.
However, brass, particularly copper are not needed in final saw silk.On the contrary, even it is expected to avoid copper.For example, copper can Conductivity issues can be caused on the surface of semiconductive silicon chip.Experience have shown that it is trouble and uneconomic to remove copper removal.
Only replace Brass coating that can not solve the problems, such as by spelter coating.In fact, there are attachment issues between zinc and steel. In addition, during the final drawing of steel wire, zinc forms a large amount of zinc powder.
Utility model content
One purpose of the utility model is the shortcomings that mitigating the prior art.
The utility model another object is that avoid saw silk on copper.
Another purpose of the utility model is to avoid forming zinc powder during drawing.
According to the utility model, a kind of saw silk is provided, with line footpath of the range from 40 μm to 300 μm and with being higher than The tensile strength of 2500MPa.Saw silk has the zinc-iron alloys layer covered with zinc coating portion.The volume of zinc-iron alloys layer accounts for Zinc coating and zinc-iron alloys layer total volume are more than 50 percent.
The two particular aspects of the utility model, i.e., the alloy-layer between the zinc coating and steel of thin dispersion and zinc coating Presence produce the advantage that.The zinc coating of thin dispersion has the advantages that generate less zinc powder during drawing.Alloy-layer The adhesion strength to steel is greatly enhanced, since alloy-layer is harder than zinc, the amount of zinc powder is also reduced and enhances cutting Effect.
During such saw silk is used, i.e., during cutting process, zinc rapidly disappears.What is left is that peak is carried on surface With paddy, coarse zinc-iron alloys layer.Paddy on the surface can enhance the transport of abrasive grain, while loose zinc or oxygen Change zinc particle and be added to grinding slurry.
Preferably, the volume of zinc-iron alloys layer account for zinc coating and zinc-iron alloys layer total volume more than 90 percent.
In a particular embodiment, the Free Surface of the zinc-iron alloys layer on saw silk accounts for the saw more than 50 percent The total outer surface of silk.It is highly preferred that the Free Surface of zinc-iron alloys layer accounts for total outer surface that saw silk is more than 75 percent.Its In, " Free Surface of zinc-iron alloys layer " means that steel wire surface can be outside steel wire close to the part of zinc-iron layer, i.e. steel wire table Face is substantially uncovered or from externally visible part.
In a preferred embodiment of the utility model, the Free Surface of zinc-iron alloys layer accounts for (such as more more than 60% In 75%, such as more than 90%, such as the outer surface more than the saw silk 95%).Therefore, " pure " zinc exists only in a small number of paddy In, zinc-iron alloys layer is presented in the most of outer surface for sawing silk.
In another preferred embodiment of the utility model, zinc coating is present in the paddy formed in zinc-iron alloys layer In.
The measurement of shared volume and exposed surface is realized by means of metallurgy standard method.For this purpose, steel wire is embedded into epoxy In resin matrix.It is made into substantially perpendicular to the cross section of steel wire axis, and section is carefully polished.By means of nitric acid Etchant (nitric acid of solution about 2% known to metallurgist, in ethanol), surface is by gentle erosion.Suitably cleaning Later, equipped with the optical microphotograph Microscopic observation of the appropriate CCD camera section, which is connected to computer, Further to carry out numerical value processing to frame.Difference between steel, zinc-iron alloys layer and pure zinc is selecting suitable enlargement ratio It can clearly distinguish, and can be selected from frame by software later.Pure zinc volume accounts for pure zinc and zinc-iron alloys total volume Ratio can be by calculating the surface area of pure zinc in cross-section and summary table of the pure zinc together with zinc-iron alloys layer in cross-section Area ratio determines.Because the variation of spelter coating is not typically observed on the longitudinal direction along steel wire (in view of producer Method, with further reference to hereafter), so the ratio only undergoes small variation in length.
In an identical manner, the Free Surface of zinc-iron alloys can pass through measurement of such as getting off:Those are identified on frame to sketch the contours They divided by epoxy resin-steel wire are changed these line segment phase adductions by the line segment of the transformation from alloy-layer to epoxy resin Total length.When coating is very thin, frame analysis program can equally be based on scanning electron microscope (SEM) in an identical manner Picture.SEM can easily carry out elemental analysis, and can identify different layer (zinc-iron and pure zinc) in this way.
Preferably, the diameter for sawing silk is less than 180 μm.The diameter more than 200 μm is not excluded for, but these are used for agglomerate steel wire (briqueteer wire)。
Saw silk can be straight saw silk or preferably so-called structural type saw silk, that is, have therebetween with the curved of segment The saw silk of pars convoluta.Bending section is attributed to, more slurries can be carried.These bending sections can be produced by the plastic deformation of steel wire It is raw, for example, by applying dual curling, by polygon morphing etc..Along steel wire, plastic deformation can be the period and continuous Or can replace with by undeformed steel wire region.
Saw silk according to the present utility model may be used as the core of fixed abrasive saw silk.It is it is preferable, however, that new according to this practicality The saw silk of type is free abrasive saw silk.
Description of the drawings
Fig. 1 shows the cross section of saw silk according to the present utility model.
Fig. 2 is the vertical view of saw silk according to the present utility model.
Specific embodiment
Saw silk according to the present utility model can be made according to following route.
Starting products are high-carbon steel wire rods, with following composition of steel:Carbon content range from 0.70% to 1.10%, Manganese content range is from 0.10% to 1.10%, and for silicone content range from 0.10% to 0.90%, sulphur and phosphorus content are limited in 0.10%; The microalloy element of additional such as chromium (up to 0.20%-0.40%) can be added;Remaining for iron and inevitably it is miscellaneous Matter.All percentages are weight percent.Typical wire rod diameter is 5.50mm.
Wire rod is cold drawn to intermediate line footpath.
At intermediate line footpath, steel wire be subjected to sorbitizing processing (patenting treatment), then zinc bath in into Row galvanizing by dipping.
Compared with the method for electrodeposition of zinc, if steel wire is zinc-plated by means of hot-dip operation, zinc-iron can be obtained Alloy-layer.In hot-dip operation, bath of the steel wire Jing Guo fused zinc simultaneously leaves bath, and realization is zinc-plated.Dip time and melting The temperature of zinc determines the thickness of zinc-iron alloys layer.Dip time is longer or the temperature of fused zinc is higher, and zinc-iron alloys layer is thicker. In the context of the utility model, term " zinc " refers to 100% pure zinc or refers to kirsite or have impurity or additional The amount of element zinc complexes, wherein impurity or additional elements not prevent the generation and growth of substantive zinc-iron alloys layer.
As the first manufacturing method, steel wire can leave bath relative to horizontal line with low-angle, the steel after being then departed from Silk is mechanically wiped.In order to wipe enough zinc, machinery wiping is carried out continuously twice.
Alternatively, as the second manufacturing method, machinery wiping can carry out under an increased pressure.This violent machinery Wiping reduces the amount of zinc.
As third manufacturing method, usually the cooling that is applied during zinc bath is left in silk and be removed or less to concentrate Mode applies so that the growth of zinc-iron alloys layer does not stop immediately.
As the 4th manufacturing method, the temperature of zinc bath increases, to improve the speed of growth of zinc-iron alloys layer.
The steel wire so coated can further for example be drawn desired final diameter by means of cold-drawing process. Drawing has been erased remaining zinc, and ensures the longitudinally constant amount of the spelter coating on per unit surface area.Complete final drawing until Steel wire final diameter is less than 300 μm, preferably less than 180 μm.Final tensile strength reaches more than 2500MPa, is greater than 3000MPa is greater than 3500MPa, is greater than 4000MPa.
Fig. 1 gives the cross section of steel wire 10 according to the present utility model, in steel cord.Fig. 1 gives one The cross section of part amplification, so that coating design is better described.Fig. 2 gives the enlarged plan view on the surface of steel wire 10.Steel Silk 10 has steel core 12.The steel core 12 is surrounded by zinc-iron alloys layer 14.On zinc-iron alloys layer 14, it is understood that there may be some zinc 16.It is watched from light microscope, it looks like a highland, wherein only fraction highland is occupied by dell.These dells are filled out Filled with zinc 16.Zinc-iron alloys can mutually exist with four kinds, i.e. the Zeta Fe of 6.7wt% (ζ -5.8wt% arrive), Delta (δ - The Fe of 7wt% to 11.5wt%), Gamma (Fe of γ -21wt% to 28wt%).Include the at most Eta of the Fe of 0.03wt% Phase (η) is considered as pure zinc.

Claims (10)

1. a kind of saw silk, with line footpath of the range from 40 μm to 300 μm and with the tensile strength higher than 2500MPa,
It is characterized in that
The saw silk has the zinc-iron alloys layer covered with zinc coating portion, and the volume of the zinc-iron alloys layer accounts for the zinc Coating and the zinc-iron alloys layer total volume are more than 50 percent.
2. saw silk according to claim 1, which is characterized in that the volume of the zinc-iron alloys layer account for the zinc coating and The zinc-iron alloys layer total volume is more than 90 percent.
3. saw silk according to claim 2, which is characterized in that the Free Surface of the zinc-iron alloys layer accounts for the saw silk Total outer surface be more than 50 percent.
4. saw silk according to claim 3, which is characterized in that the Free Surface of the zinc-iron alloys layer accounts for described The total outer surface for sawing silk is more than 75 percent.
5. saw silk according to claim 1, which is characterized in that the zinc coating is present in institute in the zinc-iron alloys layer In the paddy of formation.
6. saw silk according to claim 1, which is characterized in that the wire range is from 40 μm to 180 μm.
7. saw silk according to claim 1, which is characterized in that the saw silk is straight saw silk.
8. saw silk according to claim 1, which is characterized in that the saw silk has the bending section therebetween with segment.
9. saw silk according to claim 1, which is characterized in that the saw silk is free abrasive saw silk.
10. saw silk according to claim 1, which is characterized in that the saw silk is used as the core of fixed abrasive saw silk.
CN201720827995.8U 2017-07-10 2017-07-10 Saw silk Active CN207564744U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720827995.8U CN207564744U (en) 2017-07-10 2017-07-10 Saw silk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720827995.8U CN207564744U (en) 2017-07-10 2017-07-10 Saw silk

Publications (1)

Publication Number Publication Date
CN207564744U true CN207564744U (en) 2018-07-03

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Application Number Title Priority Date Filing Date
CN201720827995.8U Active CN207564744U (en) 2017-07-10 2017-07-10 Saw silk

Country Status (1)

Country Link
CN (1) CN207564744U (en)

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