CN104439940B - Clamp nut casting technology based on casting and rolling combined forming - Google Patents

Clamp nut casting technology based on casting and rolling combined forming Download PDF

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CN104439940B
CN104439940B CN201410622555.XA CN201410622555A CN104439940B CN 104439940 B CN104439940 B CN 104439940B CN 201410622555 A CN201410622555 A CN 201410622555A CN 104439940 B CN104439940 B CN 104439940B
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casting
clamp nut
temperature
tempering
normalizing
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CN104439940A (en
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彭锦柱
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Nanhai Nanhai Foshan mechanical and electrical equipment industry Co., Ltd.
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Foshan Solid Metal Products Co Ltd
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    • 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
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a clamp nut casting technology based on casting and rolling combined forming. According to the casting technology, casting ingredients are mixed by the ratio of carbon steel: scrap iron=89-90%:10-20%, a clamp nut is directly formed through rolling and expanding in the casting process, and the working procedures of blanking, forging and punching in an existing technology are omitted. According to the designed clamp nut casting technology based on casting and rolling combined forming, in the casting process, the defects of shrinkage, porosity, segregation and the like of a casting blank are reduced, and grains are refined as much as possible, so that the high-quality clamp nut capable of meeting the requirement for rolling and expanding forming performance is manufactured; the clamp nut is provided with an obvious yielding platform which does not disappear along with time, the delayed fracture resistance is high, plasticity is high, machining and manufacturing pollution is small, and cost is low.

Description

A kind of clamp nut casting technique based on casting and rolling composite forming
Technical field
The present invention relates to a kind of clamp nut casting technique based on casting and rolling composite forming.
Background technology
The securing member of much big steel mill trial productions mainly reaches, by adding " V " or " VN " alloy, the purpose improving intensity now; addition reaches 0.15% about; it is known that; add cost of alloy and will improve 300-400 unit; and during this kind securing member of large-scale production; due to being changed by alloy composition, speed of production, the factor such as smelting and rolling mill practice limited; the product quality being produced is also unstable; low intensity, the underproof phenomenon of strong flexor ratio often occur, the product of particularly below 14mm specification is more serious.
In the prior art, securing member hot rolling forming technique, it is all with forging stock as raw material, realize the shaping of ring by forging-punching-rolling technique, this technique first produces steel ingot, then cogging on the forging hammer of steel mill or other equipment, produce round billet or square billet, sawing machine blanking will be passed through after transporting to ring manufacturing enterprise, obtain the blank needed for ring, then by large hydraulic press or the forging of other forging equipments, make round billet, again annular blank is obtained by punching technology, then pass through Ring Rolling Machine rolling forming；This technological process is tediously long；Cogging, forging, punching technology are all hot-working, need to blank heating；Steel mill's cogging, sawing machine blanking, forging, punching are required for main equipment, not only invest big, and consume energy source and power；Punching technology and heating for multiple times cause waste of material；Have such problems as that energy source and power consumes that big, waste of material is serious, efficiency is low, high cost, increases discharge and pollution environment.
Content of the invention
Goal of the invention：The invention aims to providing a kind of clamp nut casting technique based on casting and rolling composite forming, reduce the defects such as shrinkage cavity and porosity in casting process for the strand, segregation and make crystal grain refinement as far as possible, produce the high-quality clamp nut that can meet rolling forming performance requirement, there is obvious yield point elongation simultaneously and yield point elongation does not extend in time and disappears, anti-delayed fracture resistance is strong, plasticity is high and processing and manufacturing is polluted less, low cost.
In order to solve above-mentioned technical problem, the present invention devises a kind of clamp nut casting technique based on casting and rolling composite forming, including step in detail below：
（1）Shape according to clamp nut is blended out casting mold with quartz sand, waterglass and bentonite for Modeling Material, described casting mould cap mouth is arranged on its positive camber and extends 1.5CM along perpendicular to the direction of positive camber, then casting mold is placed in baker and is dried at 220-250 DEG C；
（2）Spray a coating to the mo(U)ld face dried, described coating comprises following components by mass percentage：
Zirconium English powder：90-93%, phenolic resin：2-4%, organobentonite：1.5-2.5% and titanium dioxide：0.5-1%；
（3）According to carbon steel：80-90%, iron filings：The ratio allotment casting dispensing of 10-20%, casting dispensing is carried out smelting and obtains cast raw material solution, smelting temperature is 1680-1700 DEG C, the duration of heat is 3.7-4.0h；
Described carbon steel percentage by weight chemical composition is：C:0.18 0.3%, Si:0.6 0.9%, Mn:1.3 1.9%；Cr:0.05 0.1%, Nb:0.01 0.05%, V:0.10 0.20%, Ni:0.01 0.03%, B：0.002 0.004%, P<0.023%, S<0.023%, balance of Fe；
In the present invention, it is ensured that tensile strength reaches 690/Mpa, elongation after fracture reaches 18.20% for the selection of carbon steel, end face shrinkage factor reaches 38%, yield point elongation rate elongation percentage reaches 45.4J, and elongation at yield point reaches 880/Mpa, and the properties of cable testing bridge are greatly improved；
（4）The cast raw material solution being added into alloying element is carried out calm 3-5min, then into casting mold, casting forms clamp nut base, and pouring temperature is 1540-1550 DEG C, and poring rate is 67-70kg/s, the duration of pouring is 1.5-2.5s, adds a small amount of alterant in casting process in cast raw material solution；
The chemical analysis mass percent of described alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；
（5）After cast, clamp nut base is carried out successively through normalizing, tempering and Tempering and Quenching；
（6）To step（5）In clamp nut base after conditioned heat treatment carry out refrigerating work procedure and be down to room temperature, fine grinding and Shot Blasting are carried out to the clamp nut base being down to room temperature, finally give the clamp nut that can be used directly for casting and rolling composite forming；
This technique is compared with traditional handicraft, directly rolling forming, eliminate blanking in existing process, forging and punching operation, decrease blank heating number of times, improve production efficiency, save the energy, manpower and equipment investment, be conducive to shortened process, improve production efficiency, realize energy-saving and emission-reduction and clean manufacturing, there is important theory significance and practical value；After the conditioned heat treatment of clamp nut base, tensile strength, yield strength, room temperature impact absorb to attack and have all reached the standard of foundry goods with hardness and strengthened；
By the technological parameter of new casting mold formula and metallurgy and foundry in the present invention, and properly increase the temperature of smelting, reduce pouring temperature and control the measure such as poring rate can effectively control casting solidification process, realize crystal grain refinement and eliminate casting flaw it is ensured that the quality of foundry goods.
The present invention limit technical scheme as：
Further, the aforesaid clamp nut casting technique based on casting and rolling composite forming, its percentage by weight chemical composition is：C:0.24%, Si：0.6%, Mn:1.6%, Cr:0.08%, Nb：0.02%, V:0.10%, Ni：0.03%, B：0.002%, P：0.020%, S：0.015%, balance of Fe.
The aforesaid clamp nut casting technique based on casting and rolling composite forming, its percentage by weight chemical composition is：C:0.3%, Si：0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni：0.01%, B：0.003%, P：0.021%, S：0.018%, balance of Fe.
The aforesaid clamp nut casting technique based on casting and rolling composite forming, step（5）In clamp nut base carry out the concrete operations of normalizing, tempering and Tempering and Quenching and be：
Normalizing：Clamp nut base is sent in stove and will be heated to 850-900 DEG C, and stove is cooled to 420-450 DEG C, then turn on fire door and continue slow cooling and come out of the stove to 250-300 DEG C to be air cooled to room temperature；
Tempering：By the clamp nut biscuit furnace heat after normalizing to 680-700 DEG C, then come out of the stove after insulation 20-25min and carry out water-cooled or oil cooling to room temperature；
Tempering and Quenching：Using a normalizing+double tempering, first time temperature is more than second temperature；Normalizing：Formally fiery temperature 720-730 DEG C, is incubated 9-11min to after temperature；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800-820 DEG C, is incubated 9-12min to after temperature, and second segment heating-up temperature is 785-795 DEG C, is incubated 10-13min, carries out second normalizing after being then air cooled to room temperature to after temperature；It is tempered for second：Using heat stepwise, first paragraph heating-up temperature is 720-730 DEG C of heating, is incubated 15-18min to after temperature, and second segment heating-up temperature is 700-715 DEG C of heating, is incubated 9-11min to after temperature；
The present invention passes through Tempering and Quenching, and clamp nut base surface can be made to produce 1-3mm thickness tempered martensite, its water erosion resistent ability effectively improving；In addition, second temperature can reduce the temperature difference of surface and center portion less than first time temperature in double tempering, make clamp nut base thickness direction fine microstructures uniform；It is tempered the temperature difference reducing surface and center portion further, so that reaching unanimity to center portion performance in surface after normalizing；
Cool down after tempering, the method being combined with air cooling by water-cooled, first with cooling velocity water-cooled faster, then carry out air cooling, finally pass through slower cooling by water again to room temperature, not only can improve the water erosion resistent ability of clamp nut base, and it is stable that tissue can be made to be more uniformly distributed, pore and trachoma seldom occur it is ensured that the corrosion resistance of clamp nut base, serve unexpected technique effect.
The aforesaid clamp nut casting technique based on casting and rolling composite forming, step（6）Organic siliconresin high-temperature resistant coating is coated in clamp nut surfaces externally and internally, each constituent mass percentage fractional of described organic siliconresin high-temperature resistant coating is after middle Shot Blasting：Boron modification organic siliconresin：45-58%, heat-resisting color stuffing：35 45%, auxiliary agent：2%-4%, wherein, boron modification organic siliconresin is boric acid modified organic siliconresin or epoxide modified silicon boron resin；
Described heat-resisting color stuffing includes：
The mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder and described nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1；
Nano silicon is due to roughly the same with the basic structure of base-material; particle diameter is also less; can preferably be filled in the gap of resin binder; a resin binder network structure part even can be become; there is good supplementary function to the heat-resisting three-dimensional-structure of high-crosslinking-degree; allow resin by the SiO2 refractory protection forming one layer of fine heat-resisting performance when thermally decomposing, prevent the continuation of inner layer resin base-material to decompose, can give paint film more preferable heat endurance；
Described isolation-type functional stuffing includes following components according to the mass fraction：
Hollow glass micropearl：3-6 part, graphite：11-15 part, black silicon carbide：21-35 part, fine-grained alumina：26-30 part, molybdenum bisuphide：6-11 part, zinc oxide：3-5 part, talcum powder：3-6 part；
Molybdenum bisuphide, graphite, talcum powder is adopted, graphite material makes it be also easy to produce sliding due to distinctive crystal structure, and the lubricant of graphite dry friction simultaneously has adsorptivity, can form one layer of lubricating film in isolation-type functional stuffing（Graphite crystal film）, play the effect reducing fretting wear, there is good thermal diffusivity and thermal conductivity；
Described auxiliary agent is to include following components according to the mass fraction：
Dispersant：11-15 part, wetting agent：2-6 part, curing agent 22-50 part, delustering agent：3-6 part, coalescents：6-10 part, thickener：6-10 part, hydroxyethyl cellulose：6-10 part, pH adjusting agent：2-5 part, silane coupler：40-60 part.
Specific embodiment
Embodiment 1
Present embodiments provide a kind of clamp nut casting technique based on casting and rolling composite forming, including step in detail below：
（1）Shape according to clamp nut is blended out casting mold with quartz sand, waterglass and bentonite for Modeling Material, described casting mould cap mouth is arranged on its positive camber and extends 1.5CM along perpendicular to the direction of positive camber, then casting mold is placed in baker and is dried at 220-250 DEG C；
（2）Spray a coating to the mo(U)ld face dried, described coating comprises following components by mass percentage：
Zirconium English powder：90-93%, phenolic resin：2-4%, organobentonite：1.5-2.5% and titanium dioxide：0.5-1%；
（3）According to carbon steel：80-90%, iron filings：The ratio allotment casting dispensing of 10-20%, casting dispensing is carried out smelting and obtains cast raw material solution, smelting temperature is 1680-1700 DEG C, the duration of heat is 3.7-4.0h；
Described carbon steel percentage by weight chemical composition is：C:0.24%, Si：0.6%, Mn:1.6%, Cr:0.08%, Nb：0.02%, V:0.10%, Ni：0.03%, B：0.002%, P：0.020%, S：0.015%, balance of Fe；
In the present invention, it is ensured that tensile strength reaches 690/Mpa, elongation after fracture reaches 18.20% for the selection of carbon steel, end face shrinkage factor reaches 38%, yield point elongation rate elongation percentage reaches 45.4J, and elongation at yield point reaches 880/Mpa, and the properties of cable testing bridge are greatly improved；
（4）The cast raw material solution being added into alloying element is carried out calm 3-5min, then into casting mold, casting forms clamp nut base, and pouring temperature is 1540-1550 DEG C, and poring rate is 67-70kg/s, the duration of pouring is 1.5-2.5s, adds a small amount of alterant in casting process in cast raw material solution；
The chemical analysis mass percent of described alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；
（5）After cast, clamp nut base is carried out successively through normalizing, tempering and Tempering and Quenching, specially：
Normalizing：Clamp nut base is sent in stove and will be heated to 850-900 DEG C, and stove is cooled to 420-450 DEG C, then turn on fire door and continue slow cooling and come out of the stove to 250-300 DEG C to be air cooled to room temperature；
Tempering：By the clamp nut biscuit furnace heat after normalizing to 680-700 DEG C, then come out of the stove after insulation 20-25min and carry out water-cooled or oil cooling to room temperature；
（6）To step（5）In clamp nut base after conditioned heat treatment carry out refrigerating work procedure and be down to room temperature, fine grinding and Shot Blasting are carried out to the clamp nut base being down to room temperature, finally give the clamp nut that can be used directly for casting and rolling composite forming；
Organic siliconresin high-temperature resistant coating is coated in clamp nut surfaces externally and internally, each constituent mass percentage fractional of described organic siliconresin high-temperature resistant coating is after Shot Blasting：Boron modification organic siliconresin：45-58%, heat-resisting color stuffing：35 45%, auxiliary agent：2%-4%, wherein, boron modification organic siliconresin is boric acid modified organic siliconresin or epoxide modified silicon boron resin；
Described heat-resisting color stuffing includes：
The mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder and described nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1；
Nano silicon is due to roughly the same with the basic structure of base-material; particle diameter is also less; can preferably be filled in the gap of resin binder; a resin binder network structure part even can be become; there is good supplementary function to the heat-resisting three-dimensional-structure of high-crosslinking-degree; allow resin by the SiO2 refractory protection forming one layer of fine heat-resisting performance when thermally decomposing, prevent the continuation of inner layer resin base-material to decompose, can give paint film more preferable heat endurance；
Described isolation-type functional stuffing includes following components according to the mass fraction：
Hollow glass micropearl：3-6 part, graphite：11-15 part, black silicon carbide：21-35 part, fine-grained alumina：26-30 part, molybdenum bisuphide：6-11 part, zinc oxide：3-5 part, talcum powder：3-6 part；
Molybdenum bisuphide, graphite, talcum powder is adopted, graphite material makes it be also easy to produce sliding due to distinctive crystal structure, and the lubricant of graphite dry friction simultaneously has adsorptivity, can form one layer of lubricating film in isolation-type functional stuffing（Graphite crystal film）, play the effect reducing fretting wear, there is good thermal diffusivity and thermal conductivity；
Described auxiliary agent is to include following components according to the mass fraction：
Dispersant：11-15 part, wetting agent：2-6 part, curing agent 22-50 part, delustering agent：3-6 part, coalescents：6-10 part, thickener：6-10 part, hydroxyethyl cellulose：6-10 part, pH adjusting agent：2-5 part, silane coupler：40-60 part.
Embodiment 2
Present embodiments provide a kind of clamp nut casting technique based on casting and rolling composite forming, including step in detail below：
（1）Shape according to clamp nut is blended out casting mold with quartz sand, waterglass and bentonite for Modeling Material, described casting mould cap mouth is arranged on its positive camber and extends 1.5CM along perpendicular to the direction of positive camber, then casting mold is placed in baker and is dried at 220-250 DEG C；
（2）Spray a coating to the mo(U)ld face dried, described coating comprises following components by mass percentage：
Zirconium English powder：90-93%, phenolic resin：2-4%, organobentonite：1.5-2.5% and titanium dioxide：0.5-1%；
（3）According to carbon steel：80-90%, iron filings：The ratio allotment casting dispensing of 10-20%, casting dispensing is carried out smelting and obtains cast raw material solution, smelting temperature is 1680-1700 DEG C, the duration of heat is 3.7-4.0h；
Described carbon steel percentage by weight chemical composition is：C:0.3%, Si：0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni：0.01%, B：0.003%, P：0.021%, S：0.018%, balance of Fe；
In the present invention, it is ensured that tensile strength reaches 690/Mpa, elongation after fracture reaches 18.20% for the selection of carbon steel, end face shrinkage factor reaches 38%, yield point elongation rate elongation percentage reaches 45.4J, and elongation at yield point reaches 880/Mpa, and the properties of cable testing bridge are greatly improved；
（4）The cast raw material solution being added into alloying element is carried out calm 3-5min, then into casting mold, casting forms clamp nut base, and pouring temperature is 1540-1550 DEG C, and poring rate is 67-70kg/s, the duration of pouring is 1.5-2.5s, adds a small amount of alterant in casting process in cast raw material solution；
The chemical analysis mass percent of described alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；
（5）After cast, clamp nut base is carried out successively through normalizing, tempering and Tempering and Quenching, specially：
Normalizing：Clamp nut base is sent in stove and will be heated to 850-900 DEG C, and stove is cooled to 420-450 DEG C, then turn on fire door and continue slow cooling and come out of the stove to 250-300 DEG C to be air cooled to room temperature；
Tempering：By the clamp nut biscuit furnace heat after normalizing to 680-700 DEG C, then come out of the stove after insulation 20-25min and carry out water-cooled or oil cooling to room temperature；
Tempering and Quenching：Using a normalizing+double tempering, first time temperature is more than second temperature；Normalizing：Formally fiery temperature 720-730 DEG C, is incubated 9-11min to after temperature；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800-820 DEG C, is incubated 9-12min to after temperature, and second segment heating-up temperature is 785-795 DEG C, is incubated 10-13min, carries out second normalizing after being then air cooled to room temperature to after temperature；It is tempered for second：Using heat stepwise, first paragraph heating-up temperature is 720-730 DEG C of heating, is incubated 15-18min to after temperature, and second segment heating-up temperature is 700-715 DEG C of heating, is incubated 9-11min to after temperature；
（6）To step（5）In clamp nut base after conditioned heat treatment carry out refrigerating work procedure and be down to room temperature, fine grinding and Shot Blasting are carried out to the clamp nut base being down to room temperature, finally give the clamp nut that can be used directly for casting and rolling composite forming；
Organic siliconresin high-temperature resistant coating is coated in clamp nut surfaces externally and internally, each constituent mass percentage fractional of described organic siliconresin high-temperature resistant coating is after Shot Blasting：Boron modification organic siliconresin：45-58%, heat-resisting color stuffing：35 45%, auxiliary agent：2%-4%, wherein, boron modification organic siliconresin is boric acid modified organic siliconresin or epoxide modified silicon boron resin；
Described heat-resisting color stuffing includes：
The mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder and described nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1；
Nano silicon is due to roughly the same with the basic structure of base-material; particle diameter is also less; can preferably be filled in the gap of resin binder; a resin binder network structure part even can be become; there is good supplementary function to the heat-resisting three-dimensional-structure of high-crosslinking-degree; allow resin by the SiO2 refractory protection forming one layer of fine heat-resisting performance when thermally decomposing, prevent the continuation of inner layer resin base-material to decompose, can give paint film more preferable heat endurance；
Described isolation-type functional stuffing includes following components according to the mass fraction：
Hollow glass micropearl：3-6 part, graphite：11-15 part, black silicon carbide：21-35 part, fine-grained alumina：26-30 part, molybdenum bisuphide：6-11 part, zinc oxide：3-5 part, talcum powder：3-6 part；
Molybdenum bisuphide, graphite, talcum powder is adopted, graphite material makes it be also easy to produce sliding due to distinctive crystal structure, and the lubricant of graphite dry friction simultaneously has adsorptivity, can form one layer of lubricating film in isolation-type functional stuffing（Graphite crystal film）, play the effect reducing fretting wear, there is good thermal diffusivity and thermal conductivity；
Described auxiliary agent is to include following components according to the mass fraction：
Dispersant：11-15 part, wetting agent：2-6 part, curing agent 22-50 part, delustering agent：3-6 part, coalescents：6-10 part, thickener：6-10 part, hydroxyethyl cellulose：6-10 part, pH adjusting agent：2-5 part, silane coupler：40-60 part.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, made etc., should be included within the scope of the present invention.

Claims (3)

1. a kind of clamp nut casting technique based on casting and rolling composite forming is it is characterised in that include step in detail below：
(1) shape according to clamp nut is blended out casting mold with quartz sand, waterglass and bentonite for Modeling Material, described casting mould cap mouth is arranged on the positive camber of casting mold and extends 1.5CM along perpendicular to the direction of positive camber, then casting mold is placed in baker and is dried at 220-250 DEG C；
(2) spray a coating to the mo(U)ld face dried, described coating comprises following components by mass percentage：Zirconium English powder：90-93%, phenolic resin：2-4%, organobentonite：1.5-2.5% and titanium dioxide：0.5-1%；
(3) according to carbon steel：80-90%, iron filings：The ratio allotment casting dispensing of 10-20%, casting dispensing is carried out smelting and obtains cast raw material solution, smelting temperature is 1680-1700 DEG C, the duration of heat is 3.7-4.0h；
Described carbon steel percentage by weight chemical composition is：C:0.18 0.3%, Si:0.6 0.9%, Mn:1.3 1.9%；Cr:0.05 0.1%, Nb:0.01 0.05%, V:0.10 0.20%, Ni:0.01 0.03%, B：0.002 0.004%, P ＜ 0.023%, S ＜ 0.023%, balance of Fe；
(4) the cast raw material solution being added into alloying element is carried out calm 3-5min, then into casting mold, casting forms clamp nut base, pouring temperature is 1540-1550 DEG C, poring rate is 67-70kg/s, the duration of pouring is 1.5-2.5s, adds a small amount of alterant in casting process in cast raw material solution；
The chemical analysis mass percent of described alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；
(5) after pouring into a mould, normalizing, tempering and Tempering and Quenching are carried out successively to clamp nut base；
(6) refrigerating work procedure is carried out to the clamp nut base after heat treatment conditioned in step (5) and be down to room temperature, fine grinding and Shot Blasting are carried out to the clamp nut base being down to room temperature, finally gives the clamp nut that can be used directly for casting and rolling composite forming；
The concrete operations that clamp nut base in step (5) carries out normalizing, tempering and Tempering and Quenching are：
Normalizing：Clamp nut base is sent in stove and will be heated to 850-900 DEG C, and stove is cooled to 420-450 DEG C, then turn on fire door and continue slow cooling and come out of the stove to 250-300 DEG C to be air cooled to room temperature；
Tempering：By the clamp nut biscuit furnace heat after normalizing to 680-700 DEG C, then come out of the stove after insulation 20-25min and carry out water-cooled or oil cooling to room temperature；
Tempering and Quenching：Using a normalizing+double tempering, first time temperature is more than second temperature；Normalizing：Normalizing temperature 720-730 DEG C, is incubated 9-11min to after temperature；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800-820 DEG C, is incubated 9-12min to after temperature, and second segment heating-up temperature is 785-795 DEG C, is incubated 10-13min, carries out second tempering after being then air cooled to room temperature to after temperature；It is tempered for second：Using heat stepwise, first paragraph heating-up temperature is 720-730 DEG C, is incubated 15-18min to after temperature, and second segment heating-up temperature is 700-715 DEG C, is incubated 9-11min to after temperature.
2. the clamp nut casting technique based on casting and rolling composite forming according to claim 1 is it is characterised in that carbon steel percentage by weight chemical composition is：C:0.24%, Si：0.6%, Mn:1.6%, Cr:0.08%, Nb：0.02%, V:0.10%, Ni：0.03%, B：0.002%, P：0.020%, S：0.015%, balance of Fe.
3. the clamp nut casting technique based on casting and rolling composite forming according to claim 1 is it is characterised in that carbon steel percentage by weight chemical composition is：C:0.3%, Si：0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni：0.01%, B：0.003%, P：0.021%, S：0.018%, balance of Fe.
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