CN103981395B - A kind of aluminium zinc gear box cover and preparation technology thereof - Google Patents
A kind of aluminium zinc gear box cover and preparation technology thereof Download PDFInfo
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- CN103981395B CN103981395B CN201410230376.1A CN201410230376A CN103981395B CN 103981395 B CN103981395 B CN 103981395B CN 201410230376 A CN201410230376 A CN 201410230376A CN 103981395 B CN103981395 B CN 103981395B
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Abstract
The present invention relates to gear box cover technical field, particularly relate to a kind of aluminium zinc gear box cover and preparation technology thereof.Gear box cover of the present invention is made up of aluminium alloy material, and aluminium alloy material is made up of the chemical composition of following mass percent: zinc 94.5 ~ 96.5%, aluminium 3 ~ 5%, magnesium 0.02 ~ 0.04%, copper 0.4 ~ 0.6%, iron 0.006 ~ 0.009%; Surplus is impurity lead 0.002 ~ 0.004%, cadmium 0.0005 ~ 0.0015%, tin 0.0001 ~ 0.0008%; Preparation technology of the present invention comprises melting, die cast, polishing, goes the step of batch cutting edge of a knife or a sword, grinding, CNC processing.Gear box cover of the present invention more easily assembles, and wear resistance is high, good mechanical performance, long service life; Technique of the present invention is simple, and steady quality, production efficiency is high, and entirety can reduce the cost of more than 50%, can large-scale industrial production.
Description
Technical field
The present invention relates to gear box cover technical field, particularly relate to a kind of aluminium zinc gear box cover and preparation technology thereof.
Background technology
Gear, as one of most basic part transmitting motion and power, is widely used in industrial circle.In mechanical means, widely use gear as transmission and rotational speed control section, be that the gear of different diameter and/or dissimilar tooth form is formed gear unit and is packaged in wheel casing, closed lubrication oil, to protect working gear face, reduces frictional force, reduces power loss.Gear box cover is as a part for gearbox-case body, ensure the stopping property of wheel casing, conduct and disseminate the heat from wheel casing, Support Gear axle box bearing and transmission shaft also ensure the stable transmission of transmission system, and play function that is isolated and that reduce from wheel casing interior noise.But current existing gear box cover is made a living iron casting, oxidizablely to get rusty, wear no resistance and easily burst, work-ing life is short, and not only cost is high, and post-production is difficult, and product is too heavy and not easily assemble.Therefore, urgently develop a kind of wear-resistant, structural strength is high, the not easily gear box cover that easily assembles of explosion, long service life, light structure.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, and provide a kind of wear-resistant, structural strength is high, the not easily gear box cover that easily assembles of explosion, long service life, light structure.
Another object of the present invention is to for the deficiencies in the prior art, and the preparation technology of the aluminium zinc gear box cover providing a kind of production efficiency high, cost-saving.
The present invention is achieved through the following technical solutions.
A kind of aluminium zinc gear box cover, gear box cover is made up of aluminium alloy material, and aluminium alloy material is made up of the chemical composition of following mass percent:
Zinc 94.5 ~ 96.5%
Aluminium 3 ~ 5%
Magnesium 0.02 ~ 0.04%
Copper 0.4 ~ 0.6%
Iron 0.006 ~ 0.009%;
Surplus is other inevitable impurity, and impurity comprises the chemical composition of following mass percent:
Plumbous 0.002 ~ 0.004%
Cadmium 0.0005 ~ 0.0015%
Tin 0.0001 ~ 0.0008%.
Preferably, gear box cover is made up of aluminium alloy material, and aluminium alloy material is made up of the chemical composition of following mass percent:
Zinc 95.4 ~ 96.0%
Aluminium 3.4 ~ 4.0%
Magnesium 0.03 ~ 0.04%
Copper 0.5 ~ 0.6%
Iron 0.007 ~ 0.008%;
Surplus is other inevitable impurity, and impurity comprises the chemical composition of following mass percent:
Plumbous 0.003 ~ 0.004%
Cadmium 0.0008 ~ 0.0012%
Tin 0.0003 ~ 0.0006%.
Zinc (Zn) is the slightly light blue metal of a kind of silvery white, and density is 7.14 grams/cc, and fusing point is 419.5 DEG C.At room temperature, property is more crisp; When 100 ~ 150 DEG C, deliquescing; After 200 DEG C, become fragile again.Zinc has applicable mechanical property.The processing characteristics of zinc alloy is excellent, pass reduction can reach 60% ~ 80%, middle pressure superior performance, can deep-drawing be carried out, and there is self lubricity, extend die life, available soldering or resistance welding or electric-arc welding (need in helium) be welded, surface can carry out electroplating, process of painting, and machinability is good, has superior superplastic ability.
The weight percent of aluminium (Al) is: 3 ~ 5%.Hardness and tensile strength that aluminium element contributes to increasing material is added in zinc alloy material; Can increase its wear resistance containing Al in zinc alloy, in order to improve tensile strength and the wear resistance of material, the weight percent of Al should control more than 3%.But add toughness and processing characteristics that excessive Al can affect material, cause the toughness of material and processibility to decline in order to avoid Al is too high, the weight percent of Al should control below 5%.In the present invention, the weight percent of Al is 3 ~ 5%, both can meet tensile strength and the wear resistance requirement of material, can ensure again toughness and the processibility of material, and preferably, the weight percent of Al is 4%.
Magnesium (Mg) is one of the lightest structural metallic material, has again specific tenacity and specific rigidity is high, damping and amortization and the advantage such as machinability is good.Magnesium alloy have lightweight, specific tenacity is high, damping good, thermal fatigue property is good, not easily aging, having again good thermal conductivity, extraordinary extrusion process performance, is the high performance structures material of new generation of alternative iron and steel, aluminium alloy and engineering plastics.In zinc alloy material, add Mg can improve the specific tenacity of alloy material, thermal fatigue property and die casting performance, therefore the weight percent of Mg should control more than 0.02%; But add the tensile strength that excessive Mg can reduce alloy material, the strength degradation of gear, weight can be made to increase, therefore, cause the strength degradation of material in order to avoid Mg is too high, the weight percent of Mg should control below 0.04%.In the present invention, the weight percent of Mg is 0.02 ~ 0.04%, both can meet the specific tenacity of material, thermal fatigue property and die casting performance requirement, can meet again the requirement of strength of material.
Copper (Cu) can improve the stability of alloy material, hardness and the wear resistance of material can be improved, in zinc alloy, add Cu can also improve shearing resistance and toughness, particularly atomospheric corrosion performance, in order to improve shearing resistance and the wear resistance of zinc alloy material by adding Cu, the weight percent of Cu should control more than 0.4%.But add excessive copper and can reduce stainless mechanical property, destroy the mechanical property of zinc alloy material, zinc alloy material can be made to add at bore hole etc. and to produce red brittleness man-hour, therefore, cause the hot workability of material and plasticity to decline in order to avoid Cu is too high, the weight percent of Cu should control below 0.6%.In the present invention, the weight percent of Cu is 0.4 ~ 0.6%, both can meet shearing resistance and the wear resistance requirement of material, can meet again hot workability and the plasticity requirements of material.
Iron (Fe) is glossiness silvery white metal, and firmly have ductility, fusing point is 1535 DEG C, boiling point 3000 DEG C, has good plasticity-and thermal conductivity.The ferro element that the present invention adds is the iron powder of wrought iron, and wrought iron impurities is few, and close to pure iron, toughness is strong.The consumption of iron powder of the present invention is less than that the snappiness of 0.006% alloy material is poor, extensibility is poor, and then the density of alloy material is inadequate more than 0.009% for the consumption of iron powder, and die cast effect is poor.In zinc alloy material, add the ferro element of 0.006 ~ 0.009%, extension property and the die casting performance of alloy material can be improved.
Plumbous (Pb) cadmium (Cd) and tin (sn) are the impurity element in zinc alloy, plumbous, tin, cadmium solubleness in zinc alloy is very little, thus concentrate on grain boundary and become negative electrode, the sosoloid of rich aluminium becomes anode, under water vapour (ionogen) existent condition, facilitate intergranular galvanic corrosion, when lead impurity element in alloying constituent, cadmium, when tin exceedes a certain amount of, the intergranular corrosion of zinc alloy is made to become very responsive, in temperature, the intergranular corrosion of itself is accelerated in wet environment, reduce mechanical property, cause foundry goods aging and deform, even volume swells, mechanical property particularly plasticity significantly declines, time has been grown and has even broken, therefore in the present invention respectively by lead, cadmium, the content of tin controls 0.002 ~ 0.004%, 0.0005 ~ 0.0015%, in the scope of 0.0001 ~ 0.0008%, greatly ensure the mechanical property of the foundry goods that the present invention obtains.
The preparation technology of above-mentioned aluminium zinc gear box cover, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 350 ~ 400 DEG C, and the time of preheating is 10 ~ 15min; Again the raw material of above-mentioned mass percent is dropped in smelting furnace successively, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 600 ~ 700 DEG C, and the time of fusing is 3 ~ 6h; The temperature of refining is 500 ~ 600 DEG C, and the time of refining is 15 ~ 20min;
2) die cast: by step 1) in melt input pressure die-casting machine in die casting, obtained gear box cover primary product;
3) polishing: gear box cover primary product is carried out polishing with polishing machine;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
Wherein, in step 1) melting, the temperature of preheating is 365 ~ 385 DEG C, and the time of preheating is 12 ~ 13min; The temperature of fusing is 640 ~ 680 DEG C, and the time of fusing is 4 ~ 5h; The temperature of refining is 530 ~ 580 DEG C, and the time of refining is 16 ~ 18min.
Wherein, step 2) die cast is specially: the stenciling coating → matched moulds of preheating die casting → in die casting → by step 1 is installed → cleared up to pressure die-casting machine debugging → die casting) in melt input pressure die-casting machine in die casting → cool with solidify → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test.
Wherein, step 2) die cast pressure die-casting machine debugging operation in, the fast shot dynamics regulating pressure die-casting machine is 1 circle, and fast shot stroke is 60mm, and open time is 50s; Step 2) die cast cleaning preheated mold operation in, the temperature of mould and die preheating is 200 ~ 300 DEG C.
Wherein, step 2) die cast by step 1) in melt input pressure die-casting machine in die casting operation in, the flow velocity of melt is 0.5 ~ 0.8m/s, and the pressure of die casting is 14MPa.
Wherein, step 2) cooling of die cast is with the operation of solidifying, and cooling with the temperature of solidifying is 250 ~ 280 DEG C, and cooling with the time of solidifying is 30 ~ 40min.
Wherein, step 2) cooling of die cast is specially with the operation of solidifying: the first stage cool: elder generation is cooled to 350-400 DEG C with the speed of 5-8 DEG C/min, and cooling time is 25 ~ 30min; Subordinate phase cools: continue to be cooled to 250-280 DEG C with the speed of 15-20 DEG C/min again, cooling time is 5 ~ 10min.The present invention adopts the first stage to cool and the Slow cooling mode of subordinate phase cooling, can the crystal grain of refinement aluminium zinc and second-phase distributional pattern further, and tissue homogeneous degree also better, improves the stability of this alloy and intensity and toughness.
Wherein, step 3) polishing is specially: be that polishing is carried out in the 30-60 ° of below being placed in polishing machine emery wheel by gear box cover primary product, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing.
Beneficial effect of the present invention is: aluminium zinc gear box cover of the present invention, replace traditional production starting material pig iron, adopt aluminium alloy material die casting to form, lightweight, the easy machine-shaping of aluminium zinc, obtained gear box cover more easily assembles, wear resistance is high, its tensile strength >=318MPa, shearing resistance >=228MPa, and coefficient of extension >=7, there is the higher capability of antidetonance, good mechanical performance, long service life.
The preparation technology of aluminium zinc gear box cover of the present invention and aluminium alloy material of the present invention with the use of, can play the optimum performance of material, technique is simple, convenient operation and control, steady quality, production efficiency is high, entirety can reduce the cost of more than 50%, can large-scale industrial production.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
embodiment 1.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 350 DEG C, the time of preheating is 15min, again by the raw material of following mass percent: zinc 95.4597%, aluminium 3.9700%, magnesium 0.0347%, copper 0.5230%, iron 0.0079%, lead 0.0034%, cadmium 0.0009%, tin 0.0004% drop in smelting furnace successively, controlling foreign matter content is lead 0.0032%, cadmium 0.002%, tin 0.0004%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 600 DEG C, and the time of fusing is 6h; The temperature of refining is 500 DEG C, and the time of refining is 20min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 200 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.5m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 350 DEG C with the speed of 5 DEG C/min, cooling time is 30min; Subordinate phase cools: continue to be cooled to 250 DEG C with the speed of 20 DEG C/min again, and cooling time is 5min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 30 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 2.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 355 DEG C, the time of preheating is 14.5min, again by the raw material of following mass percent: zinc 95.4366%, aluminium 4.0100%, magnesium 0.0328%, copper 0.5110%, iron 0.0074% drop in smelting furnace successively, controlling foreign matter content is lead 0.0036%, cadmium 0.0011%, tin 0.0005%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 615 DEG C, and the time of fusing is 5.5h; The temperature of refining is 515 DEG C, and the time of refining is 19min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 215 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.55m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 400 DEG C with the speed of 8 DEG C/min, cooling time is 25min; Subordinate phase cools: continue to be cooled to 280 DEG C with the speed of 15 DEG C/min again, and cooling time is 8min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 45 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 3.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 360 DEG C, the time of preheating is 14min, again by the raw material of following mass percent: zinc 95.4615%, aluminium 3.9800%, magnesium 0.0319%, copper 0.5140%, iron 0.0081% drop in smelting furnace successively, controlling foreign matter content is lead 0.0032%, cadmium 0.0010%, tin 0.0003%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 640 DEG C, and the time of fusing is 5h; The temperature of refining is 530 DEG C, and the time of refining is 18min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 230 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.6m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 350 DEG C with the speed of 5 DEG C/min, cooling time is 30min; Subordinate phase cools: continue to be cooled to 250 DEG C with the speed of 20 DEG C/min again, and cooling time is 5min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 60 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 4.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 365 DEG C, the time of preheating is 13.5min, again by the raw material of following mass percent: zinc 95.4635%, aluminium 4.0000%, magnesium 0.0381%, copper 0.5810%, iron 0.0080% drop in smelting furnace successively, controlling foreign matter content is lead 0.0032%, cadmium 0.002%, tin 0.0004%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 645 DEG C, and the time of fusing is 4.5h; The temperature of refining is 545 DEG C, and the time of refining is 17min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 245 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.65m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 400 DEG C with the speed of 8 DEG C/min, cooling time is 25min; Subordinate phase cools: continue to be cooled to 280 DEG C with the speed of 15 DEG C/min again, and cooling time is 8min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 45 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 5.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 370 DEG C, the time of preheating is 13min, again by the raw material of following mass percent: zinc 94.5%, aluminium 5%, magnesium 0.04%, copper 0.6%, iron 0.009% drop in smelting furnace successively, controlling foreign matter content is lead 0.004%, cadmium 0.0015%, tin 0.0008%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 660 DEG C, and the time of fusing is 4h; The temperature of refining is 560 DEG C, and the time of refining is 16.5min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 260 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.7m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 350 DEG C with the speed of 5 DEG C/min, cooling time is 30min; Subordinate phase cools: continue to be cooled to 250 DEG C with the speed of 20 DEG C/min again, and cooling time is 5min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 30 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 6.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 380 DEG C, the time of preheating is 12min, again by the raw material of following mass percent: zinc 96.5%, aluminium 3%, magnesium 0.02%, copper 0.4 ~ 0.6%, iron 0.006% drop in smelting furnace successively, controlling foreign matter content is lead 0.002%, cadmium 0.0005%, tin 0.0001%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 675 DEG C, and the time of fusing is 3.5h; The temperature of refining is 575 DEG C, and the time of refining is 16min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 275 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.75m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 400 DEG C with the speed of 8 DEG C/min, cooling time is 25min; Subordinate phase cools: continue to be cooled to 280 DEG C with the speed of 15 DEG C/min again, and cooling time is 8min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 45 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 7.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 390 DEG C, the time of preheating is 11min, again by the raw material of following mass percent: zinc 95.4%, aluminium 4.0%, magnesium 0.04%, copper 0.6%, iron 0.008% drop in smelting furnace successively, controlling foreign matter content is lead 0.004%, cadmium 0.0012%, tin 0.0006%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 690 DEG C, and the time of fusing is 3.3h; The temperature of refining is 590 DEG C, and the time of refining is 15.5min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 290 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.78m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 350 DEG C with the speed of 5 DEG C/min, cooling time is 30min; Subordinate phase cools: continue to be cooled to 250 DEG C with the speed of 20 DEG C/min again, and cooling time is 5min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 60 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
embodiment 8.
The preparation technology of a kind of aluminium zinc gear box cover of the present embodiment, it comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 400 DEG C, the time of preheating is 10min, again by the raw material of following mass percent: zinc 96.0%, aluminium 3.4%, magnesium 0.03%, copper 0.5%, iron 0.007% drop in smelting furnace successively, controlling foreign matter content is lead 0.003%, cadmium 0.0008%, tin 0.0003%, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 700 DEG C, and the time of fusing is 3h; The temperature of refining is 600 DEG C, and the time of refining is 15min;
2) die cast: pressure die-casting machine is debugged, the fast shot dynamics regulating pressure die-casting machine is 1 circle, fast shot stroke is 60mm, open time is that preheating die casting is installed → cleared up to 50s → die casting, the temperature of mould and die preheating is 300 DEG C → in die casting stenciling coating → matched moulds → by step 1) in melt input pressure die-casting machine in die casting, the flow velocity of melt is 0.8m/s, the pressure of die casting is 14MPa → cool and solidify: the first stage cools: be first cooled to 400 DEG C with the speed of 8 DEG C/min, cooling time is 25min; Subordinate phase cools: continue to be cooled to 280 DEG C with the speed of 15 DEG C/min again, and cooling time is 8min → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test, obtained gear box cover primary product;
3) gear box cover primary product is 45 ° of belows being placed in polishing machine emery wheel by polishing: gear box cover primary product is carried out polishing with polishing machine, is first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
Test the performance of the aluminium zinc gear box cover that embodiment of the present invention 1-8 obtains, its detected result is as shown in the table:
Table 1
| Interventions Requested | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 7 |
| Tensile strength/MPa | 324 | 326 | 318 | 322 | 320 | 321 | 319 | 325 |
| Shearing resistance/MPa | 229 | 228 | 235 | 230 | 232 | 238 | 234 | 236 |
| Coefficient of extension | 7 | 9 | 8 | 8 | 7 | 9 | 8 | 7 |
As seen from Table 1, the tensile strength >=318MPa of the aluminium zinc gear box cover that embodiment 1-8 obtains, shearing resistance >=228MPa, and coefficient of extension >=7, good mechanical performance, quality product is good.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (9)
1. an aluminium zinc gear box cover, is characterized in that: gear box cover is made up of aluminium alloy material, and aluminium alloy material is made up of the chemical composition of following mass percent:
Zinc 94.5 ~ 96.5%
Aluminium 3 ~ 5%
Magnesium 0.02 ~ 0.04%
Copper 0.4 ~ 0.6%
Iron 0.006 ~ 0.009%;
Surplus is other inevitable impurity, and impurity comprises the chemical composition of following mass percent:
Plumbous 0.002 ~ 0.004%
Cadmium 0.0005 ~ 0.0015%
Tin 0.0001 ~ 0.0008%;
The preparation technology of described aluminium zinc gear box cover comprises following preparation process:
1) melting: first by smelting furnace preheating, the temperature of preheating is 350 ~ 400 DEG C, and the time of preheating is 10 ~ 15min; Again the raw material of above-mentioned mass percent is dropped in smelting furnace successively, make each raw material successively through fusing, refining, insulation in smelting furnace, form melt; The temperature of fusing is 600 ~ 700 DEG C, and the time of fusing is 3 ~ 6h; The temperature of refining is 500 ~ 600 DEG C, and the time of refining is 15 ~ 20min;
2) die cast: by step 1) in melt input pressure die-casting machine in die casting, obtained gear box cover primary product;
3) polishing: gear box cover primary product is carried out polishing with polishing machine;
4) batch cutting edge of a knife or a sword is removed: the burr rubbing the gear box cover primary product surface after polishing with batch cutting edge of a knife or a sword cutter with the hands;
5) grind: by the gear box cover primary product grinding of going after batch cutting edge of a knife or a sword;
6) CNC processing: the gear box cover primary product CNC machine after grinding is processed, obtained gear box cover finished product.
2. a kind of aluminium zinc gear box cover according to claim 1, it is characterized in that: gear box cover is made up of aluminium alloy material, aluminium alloy material is made up of the chemical composition of following mass percent:
Zinc 95.4 ~ 96.0%
Aluminium 3.4 ~ 4.0%
Magnesium 0.03 ~ 0.04%
Copper 0.5 ~ 0.6%
Iron 0.007 ~ 0.008%;
Surplus is other inevitable impurity, and impurity comprises the chemical composition of following mass percent:
Plumbous 0.003 ~ 0.004%
Cadmium 0.0008 ~ 0.0012%
Tin 0.0003 ~ 0.0006%.
3. a kind of aluminium zinc gear box cover according to claim 1, is characterized in that: in step 1) melting, and the temperature of preheating is 365 ~ 385 DEG C, and the time of preheating is 12 ~ 13min; The temperature of fusing is 640 ~ 680 DEG C, and the time of fusing is 4 ~ 5h; The temperature of refining is 530 ~ 580 DEG C, and the time of refining is 16 ~ 18min.
4. a kind of aluminium zinc gear box cover according to claim 1, is characterized in that: step 2) die cast is specially: the stenciling coating → matched moulds of preheating die casting → in die casting → by step 1 is installed → cleared up to pressure die-casting machine debugging → die casting) in melt input pressure die-casting machine in die casting → cool with solidify → die sinking → eject foundry goods → foundry goods is removed the mouth of a river → quality test.
5. a kind of aluminium zinc gear box cover according to claim 4, is characterized in that: step 2) in the pressure die-casting machine of die cast debugging operation, the fast shot dynamics regulating pressure die-casting machine is 1 circle, and fast shot stroke is 60mm, and open time is 50s; Step 2) die cast cleaning preheated mold operation in, the temperature of mould and die preheating is 200 ~ 300 DEG C.
6. a kind of aluminium zinc gear box cover according to claim 4, is characterized in that: step 2) die cast by step 1) in melt input pressure die-casting machine in die casting operation in, the flow velocity of melt is 0.5 ~ 0.8m/s, and the pressure of die casting is 14MPa.
7. a kind of aluminium zinc gear box cover according to claim 4, is characterized in that: step 2) cooling of die cast is with the operation of solidifying, and cooling with the outlet temperature of solidifying is 250 ~ 280 DEG C, and cooling with the time of solidifying is 30 ~ 40min.
8. a kind of aluminium zinc gear box cover according to claim 7, it is characterized in that: step 2) cooling of die cast is specially with the operation of solidifying: the first stage cool: elder generation is cooled to 350-400 DEG C with the speed of 5-8 DEG C/min, and cooling time is 25 ~ 30min; Subordinate phase cools: continue to be cooled to 250-280 DEG C with the speed of 15-20 DEG C/min again, cooling time is 5 ~ 10min.
9. a kind of aluminium zinc gear box cover according to claim 1, it is characterized in that: step 3) polishing is specially: be that polishing is carried out in the 30-60 ° of below being placed in polishing machine emery wheel by gear box cover primary product, be first the emery wheel rough polishing of 180# by grain size number, more successively with grain size number be 240# fiber crops wheel and 240# cloth wheel essence throwing.
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| CN111575533A (en) * | 2020-06-23 | 2020-08-25 | 广东省材料与加工研究所 | Zinc-aluminum alloy round ingot, preparation method and application thereof, and zinc-aluminum alloy material |
| CN112589376B (en) * | 2020-10-30 | 2021-12-28 | 广州文冲船舶修造有限公司 | Manufacturing method of gear box end cover |
| CN112467064B (en) * | 2020-11-18 | 2021-11-02 | 燕山大学 | Preparation method of water-based zinc ion battery cathode and battery |
| CN113290349A (en) * | 2021-03-17 | 2021-08-24 | 无锡尚赛精密机械有限公司 | Preparation process of worm gear case shell |
| CN114231793B (en) * | 2021-12-09 | 2023-01-13 | 百路达（厦门）工业有限公司 | Gravity casting zinc alloy |
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