CN104190737B - A kind of amorphous metal extrusion die of fast changeable core rod and extrusion process - Google Patents
A kind of amorphous metal extrusion die of fast changeable core rod and extrusion process Download PDFInfo
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- CN104190737B CN104190737B CN201410427429.9A CN201410427429A CN104190737B CN 104190737 B CN104190737 B CN 104190737B CN 201410427429 A CN201410427429 A CN 201410427429A CN 104190737 B CN104190737 B CN 104190737B
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- split
- core rod
- core
- mold core
- rod
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- 239000005300 metallic glasses Substances 0.000 title claims abstract description 26
- 238000001125 extrusion Methods 0.000 title claims abstract description 20
- 238000000034 methods Methods 0.000 title claims abstract description 20
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- 229910000808 amorphous metal alloys Inorganic materials 0.000 claims abstract description 50
- 240000006028 Sambucus nigra Species 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 13
- 238000007493 shaping process Methods 0.000 claims description 18
- 230000001681 protective Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000004017 vitrification Methods 0.000 claims description 8
- 239000002826 coolants Substances 0.000 claims description 7
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Abstract
Description
Technical field
The present invention relates to amorphous metal glass extrusion forming process and mould, belong to amorphous metal forming technique field.
Background technology
Glassy metal, also known as amorphous alloy, due to the unordered microstructure of its uniqueness, makes the advantage of its existing metal and glass, overcomes again their respective drawbacks.Glass breadks easily, does not have ductility; But the intensity of glassy metal is higher than steel, hardness exceedes high hard tool steel, and has certain toughness and rigidity, so people claim glassy metal to be " king of glass " of " strike not broken, pound not rotten ".Amorphous alloy has mechanics, the process based prediction model preferably such as high strength, high rigidity, good wearability and corrosion resistance, thus determines its field of applying widely, has broad application prospects.
The zirconium-base amorphous requirement for critical cooling rate is lower, can obtain amorphous microstructure completely, thus have multiple forming technology for zirconium-base amorphous part under lower than the cooling velocity of below 100K/s.Patent CN102877010A " a kind of cast form mode of zirconium-based bulk amorphous alloy foundry goods " discloses a kind of cast moulding method of zirconium-based bulk amorphous alloy foundry goods, the at% of the chemical composition of its foundry goods is: Zr35-45, Ti11-16, Cu10-15, Ni8-12, Be16-25, before melting, in alcohol medium, purified treatment is carried out to above-mentioned raw material ultrasonic wave, again each is divided into two parts, by its respective density, repeating cloth from down to up for twice loads in crucible, raw copper and copper crucible will be avoided during cloth to contact, when melting to prevent raw copper and copper crucible bond, then close stove to vacuumize, be filled with the argon shield of 0.05MPa, start to add hot smelting, power is added to 140KW after 60KW, 80KW, 120KW respectively keep 5 minutes and make the temperature of alloy melt reach more than 800 DEG C.What patent CN101164722A " the preparing processing net forming integrated method of a kind of non-crystaline amorphous metal workpiece " disclosed a kind of non-crystaline amorphous metal workpiece prepares processing net forming integrated method.The inventive method can be burst mould injecting after alloy masterbatch heat fused, after molten alloy cooling, form amorphous alloy, and mould is burst and carried out simple cleaning to test specimen after type and can obtain required workpiece.Utilization mould of can bursting prepares the critical thickness non-crystaline amorphous metal workpiece within the specific limits of any complicated shape by the method for casting, achieves the preparation of complicated non-crystaline amorphous metal workpiece, processing, net forming integrated technology.Patent CN1199747C " a kind of precision parts made of non-crystalline alloy superplastic die forging building mortion and method " discloses a kind of device for the shaping of bulk amorphous alloys precision parts superplastic die forging and adopts this device to prepare the technique of bulk amorphous alloys precision component.The various Irregular Shaped Parts of the gabarit that can be shaped diameter dimension 0.1 ~ 100mm, gauge 0.1 ~ 50mm, as gear class, solid or solid Step Shaft (taper shaft) class and etc. the flat thin part of axle class etc.The device invented is made up of vacuum drying oven, replaceable pressure head and mould three part.Patent CN100473472C " manufacturing process of glassy metal " discloses a kind of manufacturing process of glassy metal.The method does not produce the formed products of blemish amorphous shaping of maintenance glassy metal simultaneously, the formed products of thin-walled or thickness formed products not etc. or complicated shape utilizes and employs the molded component of the simplification operation shaping high dimensional accuracy of simply constructed mould, even if also can be shaped simply.
Amorphous alloy is after die forming, deposit problem both ways: if one is directly eject part by the ejection system of mould after being shaped, due to part after forming or supercooled liquid, eject part and easily cause damage parts, as: wear, be out of shape, break in top; If two is allow formation of parts in mould along with mould air cooling after being shaped, will need the cool time grown very much, easily cause the part of shaping partially-crystallized, cannot obtain amorphous alloy part completely, production efficiency is also very low in addition.
Take a broad view of existing patent achievement in amorphous alloy shaping, have in order to protect amorphous alloy blank and part not oxidized, have employed vacuum drying oven and fixture for forming be wrapped in inside; What have does not directly take any safeguard procedures.If do not take safeguard procedures, by oxidized for the blank and piece surface causing amorphous alloy, affect the appearance quality of part, also can affect the forming accuracy of part.If adopt vacuum drying oven that fixture for forming is wrapped in inside; mainly there is the problem of following several respects: (1) due to vacuum drying oven comparatively large, and the part that is often shaped will vacuumize, filling protective atmosphere; thus production efficiency is lower, and the loss for protective atmosphere is also larger.(2) in forming process, frock must be exceeded the vitrification point of amorphous alloy, and lower than the crystallization temperature of amorphous alloy, so just will can ensure that amorphous alloy blank could be shaped smoothly; But heated for whole frock by the resistance heating manner of vacuum drying oven, the temperature of frock is wayward.(3) when ejecting part, amorphous alloy blank after formation, still enters subcooled liquid state, and intensity is not high, if directly ejected, will cause the damage of amorphous alloy piece surface.(4) after amorphous alloy part ejects, must take out and cool fast, otherwise will the crystallization of amorphous alloy part be caused, causing forming technology failure.(5) after vacuum drying oven taken out by part, the amorphous alloy part of the condition of high temperature by ingress of air, thus causes the surface of amorphous alloy part oxidized, has a strong impact on the surface quality of amorphous alloy part.
Summary of the invention
The object of the invention is to overcome prior art deficiency, and a kind of amorphous metal extrusion die and extrusion process of fast changeable core rod are provided.Fast changeable core rod also ensures forming accuracy and the surface quality of amorphous alloy part, can prevent surface oxidation, have higher production efficiency, avoid the crystallization phenomenon of amorphous alloy part.
The technical scheme that the present invention takes is:
A kind of amorphous metal extrusion die of fast changeable core rod, comprise universal standard framework and split-type combination mold core, universal standard framework comprises upper bolster, die shoe, the guide pillar that can move up and down after support cooperation between upper bolster and die shoe, guide pin bushing, transmission rod is fixed on upper bolster by transmission rod fixed head, the lower end of transmission rod is provided with pressure head, holder is on die shoe, be provided with knock-pin below die shoe to communicate with bottom holder, split-type combination mold core is placed on holder, split-type combination mold core is combined into by least two pieces of core rod pieces, core rod piece split face is along vertical direction, the mold core cavities needed for cylindrical bump can be formed after the fluted split of core rod piece inner surface belt.
The upper surface of described holder is provided with groove, and the inner surface of groove has the gradient of 3 ~ 5 °; Split-type combination mold core bottom is provided with the step with groove fit, the outer surface of step has the gradient of 3 ~ 5 °, and the gradient of groove inner surface is identical with the outer surface gradient of core rod step, ensure the quality of fit between each lobe core rod by the groove of holder, and each lobe core rod is combined.
Be provided with gripping sleeve outside described split-type combination mold core, prevent core rod separately.The outer surface of split-type combination mold core has the gradient of 3 ~ 5 °, the inner surface of gripping sleeve also to have the gradient of 3 ~ 5 °, and both match, and the gradient of core rod is identical with the gradient of gripping sleeve.
Be provided with upper padding plate between described upper bolster and transmission rod fixed head, between described holder and die shoe, be provided with lower bolster.
Described upper bolster, upper padding plate, transmission rod fixed head are fixed together by pin or screw.Die shoe, lower bolster, holder are fixed together by pin or screw.
During shaping, split-type combination mold core is put into holder, amorphous alloy blank is put into die cavity by the hole in the middle of combined type die cavity, then pressure head is put into the hole in the middle of combined type die cavity.Adopt the assembly precision between inclined-plane guarantee split-type combination mold core and holder, ensure the assembly precision between pressure head and combined type die cavity by interference fits mode.Technical process mainly comprise split-type combination mold core assembling, heating, be shaped, eject, cool, open core rod and take out the processes such as part.
In order to ensure production efficiency, in forming process, need processing 4 ~ 5 to overlap split-type combination mold core, a set of core rod can be ensured like this in assembling, a set of core rod is in heating, a set of core rod is in shaping, a set of core rod, in cooling, ensures that shaping flow process is carried out smoothly, saves the production time of amorphous alloy part.
An amorphous metal extrusion process for fast changeable core rod, comprises step as follows:
(1) in the casing being connected with protective atmosphere (as: argon gas), assemble split-type combination mold core, and amorphous alloy blank and pressure head are put into core rod hole;
(2) core rod combined is put into the chamber type electric resistance furnace being connected with protective atmosphere (as: argon gas) to heat, the heating-up temperature of chamber type electric resistance furnace needs between the vitrification point and crystallization temperature of amorphous alloy, generally should higher than vitrification point 15 ~ 20 degree; Combination mold core is placed in stove and heats 10 ~ 30 minutes (heat time wants the diameter of core rod to determine);
(3) the core rod tool holding after heating is put into gripping sleeve, start former, by transmission rod, pressure head is pressed into the depths of core rod, impels the cavity of amorphous alloy blank filling core rod;
(4), after shaping terminates, utilize the ejecting mechanism of former, by knock-pin, combined type mold core is ejected;
(5) with instrument, core rod is clamped to cooling in cooling medium (as: quenching oil, quenching liquid, water etc.);
(6) open core rod and take out part.
The invention has the beneficial effects as follows:
(1) the amorphous alloy part of die cavity to amorphous alloy blank and shaping closed is utilized to protect, anti-oxidation.
(2) universal standard framework need not heat, and at room temperature operates, energy-saving and cost-reducing.
(3) split-type combination mold core cools after ejecting in cooling medium (as: quenching oil, quenching liquid, water etc.), improves the cooling velocity of amorphous alloy part, avoids amorphous alloy part to occur crystallization phenomenon.
(4) be shaped terminate after, in ejection process, push rod directly acts on holder, push rod not with amorphous alloy feature contacts, surface size precision and the surface quality of part can be ensured;
(5) die joint of split-type combination mold core is along vertical direction, can take out part smoothly after ensureing part forming.
Accompanying drawing explanation
Fig. 1 is the amorphous metal structure of extrusion schematic diagram of fast changeable core rod;
Fig. 2 is the split-type combination mold core explosive view (before shaping) of embodiment 1 multidiameter;
The constitutional diagram of the split-type combination mold core of Fig. 3 embodiment 1 multidiameter;
Schematic internal view after the combination of the split-type combination mold core of Fig. 4 embodiment 1 multidiameter;
Schematic internal view after the shaping of the split-type combination mold core of Fig. 5 embodiment 1 multidiameter;
The explosive view (after shaping) of the split-type combination mold core of Fig. 6 embodiment 1 multidiameter;
Fig. 7 is the explosive view of the split-type combination mold core of embodiment 2 bearing pin;
Fig. 8 is the constitutional diagram of the split-type combination mold core of embodiment 2 three bearing pin;
Fig. 9 is schematic internal view after the combination of the split-type combination mold core of embodiment 2 three bearing pin;
Figure 10 is schematic internal view after the shaping of the split-type combination mold core of embodiment 2 three bearing pin;
Figure 11 is the explosive view (after shaping) of the split-type combination mold core of embodiment 2 three bearing pin;
Wherein, 1a and 1b, guide pillar, 2, die shoe, 3, hexagon socket cap head screw, 4, split-type combination mold core, 5, lower bolster, 6, knock-pin, 7, amorphous alloy blank, 8, holder, 9, pin, 10, upper bolster, 11a and 11b, guide pin bushing, 12, upper padding plate, 13, pin, 14, transmission rod fixed head, 15, transmission rod, 16, pressure head, 17, screw, 18, gripping sleeve, the distinguish of 19a and 19b, multidiameter combined type mold core, 20, multidiameter, the distinguish of 21a, 21b and 21c, three bearing pin combined type mold cores, 22, three bearing pins.
Detailed description of the invention
Further illustrate below in conjunction with detailed description of the invention and embodiment.
A kind of amorphous metal extrusion die of fast changeable core rod, comprise universal standard framework and split-type combination mold core, universal standard framework comprises upper bolster 10, die shoe 2, guide pillar 1a and 1b that can move up and down after support cooperation between upper bolster 10 and die shoe 2, guide pin bushing 11a and 11b, transmission rod 15 is by transmission rod fixed head 14, upper padding plate 12 is fixed on upper bolster 10, transmission rod 15 lower end is provided with pressure head 16, lower bolster 5 is fixed on die shoe 2, holder 8 is on lower bolster 5, holder 5 has knock-pin 6 below, holder 8 is placed with split-type combination mold core 4, split-type combination mold core 4 is combined into by least two pieces of core rod pieces, core rod piece split face is along vertical direction, required mold core cavities can be formed after the fluted split of core rod piece inner surface belt.
The upper surface of holder 8 is provided with groove, and the inner surface of groove has the gradient of 3 ~ 5 °; Split-type combination mold core 4 bottom is provided with the step with groove fit, the outer surface of step has the gradient of 3 ~ 5 °, and the gradient of groove inner surface is identical with the outer surface gradient of core rod step, ensure the quality of fit between each lobe core rod by the groove of holder, and each lobe core rod is combined.
The die joint of split-type combination mold core is along vertical direction, can take out part smoothly after ensureing part forming.
Gripping sleeve 18 is provided with outside split-type combination mold core 4.The outer surface of split-type combination mold core 4 has the gradient of 3 ~ 5 °, and the inner surface of gripping sleeve 18 also has the gradient of 3 ~ 5 °, and the gradient of core rod is identical with the gradient of gripping sleeve.By the gradient of extruding force, core rod and the gripping sleeve in extrusion process, can guarantee that three lobes can closely be fitted like this, ensure the forming accuracy of part.
After each lobe core rod and holder combine, amorphous alloy blank is put into combined type mold core by core rod hole, then pressure head is put into core rod hole, the size relationship in pressure head and core rod hole is the form of interference fits.Universal standard framework has versatility, as long as the external diameter of split-type combination mold core is identical, the outside dimension of pressure head is greater than the size of transmission rod, and can several component sharing universal standard framework.
Extrusion process, comprises step as follows:
(1) in the casing being connected with protective atmosphere (as: argon gas), assemble split-type combination mold core, and amorphous alloy blank and pressure head are put into core rod hole;
(2) core rod combined is put into the chamber type electric resistance furnace being connected with protective atmosphere (as: argon gas) to heat, the heating-up temperature of chamber type electric resistance furnace needs between the vitrification point and crystallization temperature of amorphous alloy, generally should higher than vitrification point 15 ~ 20 degree; Combination mold core is placed in stove and heats 10 ~ 30 minutes (heat time wants the diameter of core rod to determine);
(3) the core rod tool holding after heating is put into gripping sleeve, start former, by transmission rod, pressure head is pressed into the depths of core rod, impels the cavity of amorphous alloy blank filling core rod;
(4), after shaping terminates, utilize the ejecting mechanism of former, by knock-pin, combined type mold core is ejected;
(5) with instrument, core rod is clamped to cooling in cooling medium (as: quenching oil, quenching liquid, water etc.);
(6) open core rod and take out part.
The amorphous alloy part of die cavity to amorphous alloy blank and shaping closed is utilized to protect, anti-oxidation.
Universal standard framework need not heat, and at room temperature operates.
After split-type combination mold core ejects, cooling in cooling medium (as: quenching oil, quenching liquid, water etc.), improves the cooling velocity of amorphous alloy part, avoids amorphous alloy part to occur crystallization phenomenon.
Embodiment 1: the split-type combination mold core of multidiameter, as Fig. 2-6, mold core cavities is multidiameter shape.
Amorphous alloy is Zr58.5Cu15.6Ni12.8Al10.3Nb2.8, and vitrification point and crystallization temperature are respectively 385 DEG C and 470 DEG C.This amorphous alloy, when heating-up temperature is 405 DEG C, can be incubated 30 minutes and have crystallization phenomenon, can meet the requirement of technique.In heating process, the heating-up temperature of chamber type electric resistance furnace is arranged on 403 DEG C ~ 407 DEG C, the heat time is 20 minutes.Protective atmosphere is argon gas.The material of combined type mold core is H13 hot die steel.Cooling medium is quenching oil.
The split-type combination mold core of embodiment 2: three bearing pin, as Fig. 7-11, mold core cavities is three bearing pin shapes.
Amorphous alloy is Zr58.5Cu15.6Ni12.8Al10.3Nb2.8, and vitrification point and crystallization temperature are respectively 385 DEG C and 470 DEG C.This amorphous alloy, when heating-up temperature is 405 DEG C, can be incubated 30 minutes and have crystallization phenomenon, can meet the requirement of technique.In heating process, the heating-up temperature of chamber type electric resistance furnace is arranged on 403 DEG C ~ 407 DEG C, the heat time is 20 minutes.Protective atmosphere is argon gas.The material of combined type mold core is H13 hot die steel.Cooling medium is quenching oil.
Claims (6)
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| CN103350122A (en) * | 2013-06-28 | 2013-10-16 | 洛阳北川重工机械有限公司 | Gear shaft cold extruding process and mould |
| CN203711515U (en) * | 2014-02-12 | 2014-07-16 | 泉州银艺机械有限公司 | Cold extrusion mold for automobile tappet body |
| CN204108012U (en) * | 2014-08-27 | 2015-01-21 | 山东科技大学 | A kind of amorphous metal extrusion die of fast changeable core rod |
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| CN104190737A (en) | 2014-12-10 |
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