CN106048431A

CN106048431A - Alloy nut connecting piece low in weight and high in strength and preparation method thereof

Info

Publication number: CN106048431A
Application number: CN201610549123.XA
Authority: CN
Inventors: 张立安; 魏明军
Original assignee: WANXIN CASTING CO Ltd MAANSHAN CITY
Current assignee: WANXIN CASTING CO Ltd MAANSHAN CITY
Priority date: 2016-07-13
Filing date: 2016-07-13
Publication date: 2016-10-26

Abstract

The invention discloses an alloy nut connecting piece low in weight and high in strength. The alloy steel nut connecting piece is characterized by being prepared from, by weight percent, 0.26%-0.34% of carbon, 0.17%-0.25% of manganese, 0.05%-0.14% of niobium, 2.15%-3.25% of aluminum, 0.03%-0.05% of molybdenum, 2.4%-2.7% of magnesium, 0.073%-0.14% of nickel, 0.032%-0.045% of tungsten, 0.07%-0.08% of tin, 20%-25% of a refining slag regulating agent, a proper amount of nitrogen and the balance Fe and inevitable impurities; and the refining slag regulating agent is prepared from, by weight, 20-45 parts of bauxite, 15-25 parts of marble, 19-44 parts of silica sand, 5-10 parts of barium, 10-11 parts of active lime, 9-10 parts of fluorgypsum, 4-8 parts of silica powder, 6-7 parts of electric smelting magnesium powder, 5-10 parts of albite and 2-5 parts of an aluminum shot. The alloy nut connecting piece is low in weight and high in strength, and dephosphorization is thorough; and a pattern is sprayed to the surface of a nut, and therefore the attractiveness of the nut is improved while rust prevention is achieved.

Description

Alloy screw connector that lightweight intensity is high and preparation method thereof

Technical field

The present invention relates to machine components manufacture field, particularly relate to the high alloy screw connector of a kind of lightweight intensity and Its preparation method.

Background technology

Nut is exactly nut, is threaded together the part for playing the role of fastening, all manufacturing machines with bolt or screw rod Tool must a kind of element according to the difference of material, be divided into several big types such as carbon steel, rustless steel, non-ferrous metal (such as copper).Example As: self-locking nut, stop nut, locking nut, four paws nut, nut, nut, screw-in nut lock nut, thin bar screw are even Connected nut self-locking hexagonal acorn nut, special fot screw nut, hexagonal crown thin nut, eyenut.Embedded annular knurl The main operating type of copper nut is injection, is embedded into inside working of plastics or direct mold injection, if using mould after heating Tool injection, the fusing point of PA/NYLOY/PET is all at 200 ° of more than C, and after inserted num is entered plastic by hot melt, temperature uprises rapidly, note After molded, the rapid crystallisation by cooling of plastic body is hardening, if inserted num temperature is also in high temperature, that is possible to down to copper spiral shell Female place contacted with working of plastics starts to get loose or crack occur.So all using the spiral shell of copper material in the injection of inserted num Mother rather than carbon steel nut.

The intensity of nut and service life and the founding materials of bolt, and the various trace alloying elements in founding materials The inseparable relation that has of quantity, the constituent that the Steel material that traditional bolt is used exists alloying element is mixed and disorderly, Due effect can not be played, and traditional method for making steel there is also defect, cause the impurity in molten steel to be difficult to remove, affect spiral shell Female many-sided mechanical performance, the especially using method of slag modifier for refining molten steel is improper, Chinese patent slag modifier for refining molten steel: Application number: indicate a kind of slag modifier for refining molten steel in the patent document of 00107235.8, it contain (weight %): CaO20～ 45%, Al2O320～45%, in metal Al, Si, Ca, Ba, Re one or more 5～15%, CaF24～6%, SiO2≤10%, MgO≤10%.This slag modifier for refining can have the structure of fritting solid solution.The molten steel processed with this slag modifier for refining contains very Low sulfur, oxygen and field trash, but to there is composition kind few for the slag modifier for refining in file, and preparation method is simple, it is difficult to reach To preferable effect, and method is single, does not point out the scheme being combined with each other with other processing methods, does not the most point out simultaneously Its follow-up machine casting and the complete supporting technology scheme of processing technique, herein in conjunction with prior art, provide raising nut whole The complete machining technique of body mechanical performance.

Summary of the invention

The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of weight is light, and intensity is high, and dephosphorization Thoroughly, and at nut surface spraying decorative pattern, the alloy nut that the lightweight intensity of the aesthetics improving nut while antirust is high Connector and preparation method thereof.

The present invention is achieved by the following technical solutions:

The alloy screw connector that a kind of lightweight intensity is high, it is characterised in that include following parts by weight of component: carbon 0.26- 0.34, manganese 0.17-0.25, niobium 0.05-0.14, aluminum 2.15-3.25, molybdenum 0.03-0.05, magnesium 2.4-2.7, nickel 0.073-0.14, Tungsten 0.032-0.045, stannum 0.07-0.08, slag modifier for refining 20-25, appropriate nitrogen, surplus Fe and inevitable impurity；Institute State slag modifier for refining to be composed of the following raw materials by weight: bauxite 20-45, marble 15-25, quartz sand 19-44, barium 5-10, Active lime 10-11, fluorgypsum 9-10, silicon powder 4-8, electric smelting magnesium powder 6-7, albite 5-10, aluminum shot 2-5；Described refine is adjusted The preparation method of slag agent is: by bauxite, marble, silicon powder, electric smelting magnesium powder, quartz sand, barium, active lime, fluorgypsum, sodium Anhydrite, aluminum shot add appropriate water mixing, then make spherical, are then placed in shaft furnace making fuel fritting with coke, and prefusing temperature is 1400-1500 DEG C, being stirred for uniformly, liquid slag quickly cools down through liquid nitrogen again, places into grinding in ball grinder powdered i.e. ?.

The preparation method of the alloy screw connector that described lightweight intensity is high, it is characterised in that comprise the following steps:

(1) material carbon by weight, manganese, niobium, lead, molybdenum, magnesium, nickel, tungsten, stannum and ferrum are put into preheating furnace, by pre-for melting raw material Heat carries out melting to putting into after 250 DEG C-350 DEG C in induction furnace, control temperature at 1500-1600 DEG C, aluminum matter reducing agent successively, Calcareous metallurgic auxiliary materials, then with inert material nitrogen banking mouth；

(2) carbon dioxide in liquid carbon dioxide gas cylinder is transported in cryogenic liquid vaporizer by bus-bar, places into In buffering air accumulator, standby, fusion process is blown in furnace hearth the mixed gas of oxygen and carbon dioxide, and carries out simultaneously The stirring of 2-5 furnace bottom, melt agitated uniformly after sample immediately, carry out on-the-spot sample analysis, probe temperature must not be less than 1400 DEG C, root According to the result of sample analysis, carry out desulfurization, deoxidation, add that part slag modifier for refining carries out initial refining, rear interval 30-35 divides Zhong Houzai is added remaining slag modifier for refining and carries out double refining, it is thus achieved that molten steel；

(3) being put into by swage in fuse kiln and heat, carry out moulding the most one by one, control temperature, at 200-230 DEG C, utilizes low pressure Fluidised form precoated sand is blown into die cavity by 0.4-0.5MPa compressed air, covers uniformly, molten steel is poured into casting in swage and forms nut Connector blank；

(4) screw connector blank is heated to 400-450 DEG C, keeps 3-4 hour, then in 30-40 minute, be warming up to 750- 800 DEG C, carry out quenching with quenching oil cold, but, then carry out being tempered 35-45 at 380-400 DEG C by the screw connector after quenching Minute, then from tempering furnace, take out cooling in the tempering oil putting into 280-300 DEG C, the screw connector after heat treatment is carried out car Cut processing, it is thus achieved that finished product；

(5) use banana oil to clean up on the surface of finished product, then cover on the surface of workpiece one layer of decorative pattern designed or The guard of pattern, carries out spray paint to the workpiece covering guard, after take off guard, mummification 10-20 minute, then at surface of the work Spraying gloss oil, to obtain final product.

The present invention adds the trace alloying elements such as carbon, manganese, niobium, lead, molybdenum, magnesium, nickel, tungsten, stannum on the basis of high-carbon steel, this Sample carbon, the interpolation of manganese add wearability and corrosion resistance, and the interpolation that with the addition of the element such as tungsten, stannum maintains enough hard Degree, the present invention uses slag modifier for refining to be used for the melting of molten steel, and is blown into oxygen and carbon dioxide wherein, by being blown into dioxy Changing carbon replaces partial oxidation to reduce thermal discharge with each element reaction in molten iron, so that Primary period temperature is effectively controlled, Be conducive to converter molten pool dephosphorization, the impurity in molten steel can be made to lower further, improve the purity of molten steel, take out oxide inclusion, Swage is used to cover husky technique by repeatedly refine and sample analysis technology, the strict quality controlling molten steel, and the present invention, swage Just performance transition magnesium iron graphitization expansion direction in process of setting, is become inward expansion from outward expansion, it is achieved that graphitization Expand from feeding head-free casting；Thin owing to covering layer of sand, die cavity is unlikely to deform, and causes the precision of foundry goods to greatly improve；Cover layer of sand Existence improve service life of foundry goods, reduce production cost；The present invention is by carrying out spraying with flower on nut surface The paint of stricture of vagina, not only acts as erosion-resisting effect, and serves the quality sense of hoisting nut.

Detailed description of the invention

The alloy screw connector that a kind of lightweight intensity is high, it is characterised in that include following parts by weight of component: carbon 0.26-0.34, manganese 0.17-0.25, niobium 0.05-0.14, aluminum 2.15-3.25, molybdenum 0.03-0.05, magnesium 2.4-2.7, nickel 0.073- 0.14, tungsten 0.032-0.045, stannum 0.07-0.08, slag modifier for refining 20-25, appropriate nitrogen, surplus Fe and the most miscellaneous Matter；Described slag modifier for refining is composed of the following raw materials by weight: bauxite 20-45, marble 15-25, quartz sand 19-44, barium 5-10, active lime 10-11, fluorgypsum 9-10, silicon powder 4-8, electric smelting magnesium powder 6-7, albite 5-10, aluminum shot 2-5；Described essence The preparation method of refining slag adjusting agent is: by bauxite, marble, silicon powder, electric smelting magnesium powder, quartz sand, barium, active lime, fluorite Cream, albite, aluminum shot add appropriate water mixing, then make spherical, are then placed in shaft furnace making fuel fritting, fritting temperature with coke Degree, for 1400-1500 DEG C, is stirred for uniformly, and liquid slag quickly cools down through liquid nitrogen again, places into grinding in ball grinder and becomes powder Shape and get final product.

Claims

1. the alloy screw connector that a lightweight intensity is high, it is characterised in that include following parts by weight of component: carbon 0.26- 0.34, niobium 0.05-0.14, aluminum 2.15-3.25, molybdenum 0.03-0.05, magnesium 2.4-2.7, nickel 0.073-0.14, tungsten 0.032- 0.045, manganese 0.17-0.25, stannum 0.07-0.08, slag modifier for refining 20-25, appropriate nitrogen, surplus Fe and the most miscellaneous Matter；Described slag modifier for refining is composed of the following raw materials by weight: bauxite 20-45, marble 15-25, quartz sand 19-44, barium 5-10, active lime 10-11, fluorgypsum 9-10, silicon powder 4-8, electric smelting magnesium powder 6-7, albite 5-10, aluminum shot 2-5；Described essence The preparation method of refining slag adjusting agent is: by bauxite, marble, silicon powder, electric smelting magnesium powder, quartz sand, barium, active lime, fluorite Cream, albite, aluminum shot add appropriate water mixing, then make spherical, are then placed in shaft furnace making fuel fritting, fritting temperature with coke Degree, for 1400-1500 DEG C, is stirred for uniformly, and liquid slag quickly cools down through liquid nitrogen again, places into grinding in ball grinder and becomes powder Shape and get final product.

The preparation method of the alloy screw connector that lightweight intensity the most as claimed in claim 1 is high, it is characterised in that include with Lower step: