CN111379777B - Method for manufacturing corrosion-resistant self-tapping screw and product thereof - Google Patents

Method for manufacturing corrosion-resistant self-tapping screw and product thereof Download PDF

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Publication number
CN111379777B
CN111379777B CN201911232416.5A CN201911232416A CN111379777B CN 111379777 B CN111379777 B CN 111379777B CN 201911232416 A CN201911232416 A CN 201911232416A CN 111379777 B CN111379777 B CN 111379777B
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self
tapping screw
paint
corrosion
rust
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CN111379777A (en
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陈冠维
陈冠宇
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Fangjin Material Technology Co ltd
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Fangjin Material Technology Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00Features common to bolt and nut
    • F16B33/06Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00Modifying the physical properties of iron or steel by deformation
    • C21D7/02Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention discloses a method for manufacturing rust-proof self-tapping screws and a product thereof, wherein the method comprises the steps of bombarding dimples on the surfaces of the self-tapping screws by metal glass particles in a bead beating mode; then forming, dipping or coating anti-corrosion paint, anti-rust paint or anti-rust coating (containing anti-rust wax) to obtain the self-tapping screw with anti-rust function. After the self-tapping screw is tapped into the base material, even if the paint or coating on the surface layer of the screw is scraped, the paint or coating in the micro-pit can be squeezed into the gap between the self-tapping screw and the notch of the base material under the extrusion action of the compression stress when the self-tapping screw is tapped, so that the gap is filled with the paint or coating, the sealant can prevent surrounding air and water vapor from entering the gap, the screw and the notch of the base material are ensured not to be corroded, the service life of the structure of the screw and the notch of the base material can be prolonged, and the construction and maintenance cost is greatly reduced.

Description

Method for manufacturing rust-proof self-tapping screw and product thereof
Technical Field
The invention relates to a screw, in particular to a method for manufacturing an anti-corrosion self-tapping screw and a product thereof.
Background
The surfaces of the existing steel plates, corrugated plates and the like are treated by baking varnish for rust prevention, and brackets and section steel are mostly subjected to hot dip galvanizing for rust prevention. These rust-preventive means can effectively protect the substrate from rusting before the rust-preventive layer is destroyed. However, after drilling and installation, the rust-proof layer is damaged, and the cut of the screw tap is not protected by the rust-proof layer, so that corrosion and rust are generated from the drilling position and further diffused to other surfaces, and the rust-proof layer is peeled off in a whole piece.
Some methods are to drill holes, clean the drilled holes, then coat hole sealing paint or antirust paint, and then lock the drilled holes with screws and nuts subjected to antirust treatment. However, this method is time-consuming and labor-consuming, and the labor time and labor cost are greatly increased, so that it is almost impossible to construct the concrete. The current conventional method is to use a self-tapping screw to directly tap and lock and then spray paint on the nut. The method can be rapidly failed in a corrosive or polluted environment, such as high-salinity environment like sea and coasts, or places with strong sunshine and wind and rain on roofs, which can cause paint spraying cracking and lose the corrosion protection effect.
In addition, the self-tapping screw used for the metal plates such as steel plate, aluminum plate, etc. combines the actions of drilling and tapping, and the metal of the substrate and the screw are tightly worn without any gap, so if the self-tapping screw is first painted with the anti-rust paint on the outer surface, the paint will be removed and will not enter the gap of the self-tapping screw, so the gap will not resist the penetration of oxygen, moisture, salt, etc. and the corrosion and rust will occur.
Disclosure of Invention
The invention aims to provide a method for manufacturing an anti-corrosion self-tapping screw, which comprises the following steps:
(1) Performing a bead striking on a surface of a tapping screw, comprising:
bombarding the surface of the self-tapping screw by metal glass particles under the pressure of compressed inert gas to form micro-pits on the surface, and forming a layer of metal glass film on the surface of the self-tapping screw after the metal glass particles are bead-struck, wherein the metal glass film can strengthen the surface hardness and strength of the self-tapping screw and endow the self-tapping screw with an anti-corrosion function; and
(2) And (3) forming, impregnating or coating the self-tapping screw subjected to bead beating on the surface containing the micro-pits with anti-corrosion paint or coating to obtain the self-tapping screw with the anti-corrosion function.
In some embodiments, the rust inhibitive paint or coating is selected from: natural air-drying type paint, heat-hardening type paint, ultraviolet-hardening type paint, paint formed by mixing and crosslinking two agents when in use, or anti-rusting wax.
The invention also discloses the rust-proof self-tapping screw prepared by the method for manufacturing the rust-proof self-tapping screw.
The beneficial technical effects of the invention are as follows:
the method of the invention firstly uses the shot peening mode to shoot dense micro-pits (micro-dimples) on the surface of the self-tapping screw by metal glass particles, thus strengthening the hardness of the surface and endowing the surface with corrosion resistance; then, the self-tapping screw with the anti-corrosion function is manufactured by using a formed (forming), dipped (dipping) or coated (coating) thin layer of anti-corrosion paint, anti-corrosion paint or anti-corrosion coating (containing anti-corrosion wax). After the tapping screw is tapped into a substrate (or a base material), even if paint or a coating on the surface layer of the tapping screw is scraped, the paint or the coating in the micro-pit can be squeezed into a gap between the tapping screw and the substrate under the squeezing action of pressure stress (compressive stress) during tapping of the tapping screw, so that the gap is filled, and like a sealant (sealant), the gap is prevented from being filled with ambient air and water vapor, so that the notches of the tapping screw and the base material are not corroded, the structural life of the tapping screw and the base material can be prolonged, and the construction and maintenance cost is greatly reduced.
Drawings
FIG. 1 is a cross-sectional view of the tapping screw of the present invention after being struck with a bead;
FIG. 2 is a cross-sectional view of a self-tapping screw after being hit by a ball after being formed, impregnated, or coated with a rust inhibitive paint;
FIG. 3 is an enlarged partial cross-sectional view taken at the reference numeral in FIG. 2;
FIG. 4 is an enlarged partial cross-sectional view of a self-tapping screw of the present invention coated with a rust inhibitive paint locked into a substrate to observe the relationship between the screw and the cut of the substrate.
Symbolic description in the drawings:
1. self-tapping screws;
11. micro-pits;
12. an anti-corrosion paint layer;
121. an outer layer of anti-rust paint;
122. an inner layer of anti-rust paint;
s, a base material;
s1, cutting;
p-compressive stress.
Detailed Description
The concrete embodiment of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, and the following will gradually explain the method of manufacturing the corrosion-resistant self-tapping screw of the present invention:
(1) Performing bead peening (shot peening) on the surface of the tapping screw:
on the surface of the self-tapping screw 1, metal glass particles are bombarded on the surface of the self-tapping screw 1 under the high pressure of compressed inert gas, so that dense micro-pits 11 (micro-dimples) are formed, the diameter of each micro-pit is between 1 micron and 50 microns, as shown in figure 1, like small cavities on a golf ball, after the metal glass particles are impacted, a thin metal glass film is formed on the surface of the self-tapping screw, and the metal glass film strengthens the hardness and the strength of the surface of the self-tapping screw and endows the self-tapping screw with the function of rust prevention.
(2) Forming (forming), impregnating (impregnating) or coating (coating) an anti-corrosion paint layer 12 (shown in figures 2 and 3) on the surface containing the micro-pits 11 by the bead-blasted self-tapping screw 1:
if the dipping (dipping) mode is adopted, the tapping screws are put into a container filled with anti-rust paint to be dipped for a period of time (several hours), so that the anti-rust paint permeates into the surfaces of the tapping screws and the dense micro-cells 11, thereby forming an anti-rust paint layer 12 on the surfaces of the tapping screws 1, after the dipping is finished, the tapping screws dipped with the anti-rust paint are placed on a net rack, redundant anti-rust paint on the screws is filtered in the dripping (driin) mode and the like, and a centrifuge can be used for centrifugally separating and recycling the residual anti-rust paint if necessary. If the adhered rust-proof paint is coated on the surface of the screw in a thin layer, the operation of centrifugal separation is not needed.
The anti-corrosion paint or coating can be selected from natural air-drying paint, thermal curing paint, ultraviolet curing paint or paint formed by mixing and crosslinking A and B agents during use, and the invention is not limited.
Of course, the present invention may also use the rust-resistant wax (wax) as the rust-resistant coating.
The anti-rust paint or coating used in the present invention can be purchased from commercially available anti-rust paints or coatings or waxes, which are known materials and will not be described in detail, and the anti-rust paints or coatings are worth mentioning: after the anti-rust paint used by the invention is dipped or coated on the surface of the self-tapping screw, the anti-rust paint can be dried by natural air drying and can be dried and hardened by heating if necessary. In order to ensure that the self-tapping screws impregnated or coated with the anti-corrosion paint are isolated from the air, a plurality of self-tapping screws dipped with the anti-corrosion paint can be sealed into a sealed bag, and the self-tapping screws are taken out of the sealed bag by constructors for use when in use, so that the anti-corrosion paint is not easy to dry, is isolated from the air (or water vapor) at all times, and can be kept fresh and taken immediately.
The self-tapping screw 1 dip-coated with the anti-corrosive paint layer 12 of the present invention is locked into the substrate S, as shown in fig. 4, due to the force applied by the tapping screw 1 and the notch S1 of the substrate S, a plurality of outer anti-corrosive paint layers 121 on the surface will be scraped by friction, but the inner anti-corrosive paint layer 122 located in the micro-cavity 11 can be squeezed into the gap of the notch S1 due to the squeezing action of the compressive stress (P) applied by the tapping, like the sealant (sealant) to fill and seal the gap between the screw 1 and the notch S1 of the substrate S, so that the external air and moisture are isolated and cannot permeate, and at this time, the anti-corrosive paint layer 12 effectively exerts the functions of anti-corrosive and anti-corrosive.
The invention has the following advantages:
1. because the surface of the self-tapping screw is provided with the dense and hemp micro-pits 11, the inner layer 122 of the anti-corrosion paint existing in each micro-pit 11 can be extruded out by compressive stress during tapping construction, and automatically fills a gap between the screw and the notch (S1) of the substrate, such as a sealant, so that the gap is isolated from the outside and the anti-corrosion effect is achieved;
2. the construction is simple and convenient, the service life of the structure can be prolonged, and the construction and maintenance cost is greatly reduced;
3. when the metal glass bead is hit, the surface of the self-tapping screw is hit to form a metal glass thin layer, the hardness and the strength of the metal glass thin layer are strengthened, and the metal glass thin layer has corrosion resistance, and after the metal glass thin layer is dipped and coated with the corrosion-resistant paint, the corrosion-resistant effect of the self-tapping screw is enhanced.
When the alternative energy is sought, the popularization of solar energy is vigorously developed and is not obvious. However, the solar panels are constructed outdoors and in open areas or at seas and rivers and are subjected to sun and rain, moisture or salt (seas) erosion, and the solar panels cannot be used due to corrosion of fixing screws, so that the solar panels need to be preserved and replaced with new ones, and the maintenance cost is greatly increased. The invention can overcome the problem of corrosion of outdoor projects which need to be screwed tightly by screws with large seaside, can prolong the service life of related projects even though only small self-tapping screws are used, and has huge economic and practical values.
The present invention may be modified or changed appropriately without departing from the spirit and scope of the present invention, and the present invention should not be limited thereto.

Claims (3)

1. A method for manufacturing a rust-resistant self-tapping screw, characterized by comprising the steps of:
(1) Performing a bead striking on a surface of a tapping screw, comprising:
bombarding the surface of the self-tapping screw by metal glass particles under the pressure of compressed inert gas to form micro-pits on the surface, and forming a layer of metal glass film on the surface of the self-tapping screw after the metal glass particles are bead-struck, wherein the metal glass film can strengthen the surface hardness and strength of the self-tapping screw and endow the self-tapping screw with an anti-corrosion function; and
(2) And (3) forming, impregnating or coating the self-tapping screw subjected to bead beating on the surface containing the micro-pits with anti-corrosion paint or coating to obtain the self-tapping screw with the anti-corrosion function.
2. A method of making a corrosion-resistant, self-tapping screw as claimed in claim 1, wherein the corrosion-resistant paint or coating is selected from the group consisting of: natural air-drying type paint, heat-hardening type paint, ultraviolet-hardening type paint, paint formed by mixing and crosslinking two agents when in use, or anti-rusting wax.
3. A corrosion-resistant self-tapping screw produced by the method for producing a corrosion-resistant self-tapping screw according to claim 1.
CN201911232416.5A 2018-12-28 2019-12-05 Method for manufacturing corrosion-resistant self-tapping screw and product thereof Active CN111379777B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW107147725 2018-12-28
TW107147725A TWI683967B (en) 2018-12-28 2018-12-28 Method and product for manufacturing anti-corrosion self-tapping screw

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CN111379777A CN111379777A (en) 2020-07-07
CN111379777B true CN111379777B (en) 2023-03-14

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184883A (en) * 2001-12-20 2003-07-03 Nissan Motor Co Ltd Bearing sliding member
CN101103221A (en) * 2005-01-13 2008-01-09 住友金属工业株式会社 Threaded joint for steel pipes
CN101379307A (en) * 2006-02-10 2009-03-04 三菱重工业株式会社 Bolt and method for manufacturing bolt
CN102449177A (en) * 2009-05-29 2012-05-09 住友电气工业株式会社 Linear object, bolt, nut and washer each comprising magnesium alloy
CN107841175A (en) * 2017-10-27 2018-03-27 安徽瑞合铁路紧固件科技有限公司 A kind of chromium-free Dyclo paint of rub resistance
CN108687278A (en) * 2017-03-29 2018-10-23 丰田自动车株式会社 Roll the manufacturing method of bolt

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004060873A (en) * 2002-07-31 2004-02-26 Nippon Piston Ring Co Ltd Piston ring and its manufacturing method
EP1712659A1 (en) * 2005-04-11 2006-10-18 Elisha Holding LLC Corrosion resistant article and method of production thereof
TWM504649U (en) * 2015-05-05 2015-07-11 Tai Yi Precise Ind Co Ltd Improved shop peening structure of titanium screws

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184883A (en) * 2001-12-20 2003-07-03 Nissan Motor Co Ltd Bearing sliding member
CN101103221A (en) * 2005-01-13 2008-01-09 住友金属工业株式会社 Threaded joint for steel pipes
CN101379307A (en) * 2006-02-10 2009-03-04 三菱重工业株式会社 Bolt and method for manufacturing bolt
CN102449177A (en) * 2009-05-29 2012-05-09 住友电气工业株式会社 Linear object, bolt, nut and washer each comprising magnesium alloy
CN108687278A (en) * 2017-03-29 2018-10-23 丰田自动车株式会社 Roll the manufacturing method of bolt
CN107841175A (en) * 2017-10-27 2018-03-27 安徽瑞合铁路紧固件科技有限公司 A kind of chromium-free Dyclo paint of rub resistance

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TW202026539A (en) 2020-07-16
CN111379777A (en) 2020-07-07

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