CN1276275A - Magnesium alloy pressure die casting method and articles - Google Patents
Magnesium alloy pressure die casting method and articles Download PDFInfo
- Publication number
- CN1276275A CN1276275A CN99122855A CN99122855A CN1276275A CN 1276275 A CN1276275 A CN 1276275A CN 99122855 A CN99122855 A CN 99122855A CN 99122855 A CN99122855 A CN 99122855A CN 1276275 A CN1276275 A CN 1276275A
- Authority
- CN
- China
- Prior art keywords
- magnesium alloy
- metal pattern
- casting
- die
- filling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 102
- 238000004512 die casting Methods 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 claims abstract description 313
- 239000002184 metal Substances 0.000 claims abstract description 313
- 238000000576 coating method Methods 0.000 claims abstract description 51
- 239000011248 coating agent Substances 0.000 claims abstract description 48
- 238000002844 melting Methods 0.000 claims abstract description 31
- 230000008018 melting Effects 0.000 claims abstract description 31
- 238000005266 casting Methods 0.000 claims description 174
- 206010039509 Scab Diseases 0.000 claims description 39
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 230000003647 oxidation Effects 0.000 claims description 19
- 238000007254 oxidation reaction Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 15
- 239000003870 refractory metal Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 8
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 8
- 239000000347 magnesium hydroxide Substances 0.000 claims description 8
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- 229910052718 tin Inorganic materials 0.000 claims description 8
- 239000010445 mica Substances 0.000 claims description 7
- 229910052618 mica group Inorganic materials 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052582 BN Inorganic materials 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000005229 chemical vapour deposition Methods 0.000 claims description 5
- 230000006837 decompression Effects 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229910004541 SiN Inorganic materials 0.000 claims 1
- 229910034327 TiC Inorganic materials 0.000 claims 1
- 229910010413 TiO 2 Inorganic materials 0.000 claims 1
- 229910003465 moissanite Inorganic materials 0.000 claims 1
- 229910010271 silicon carbide Inorganic materials 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 19
- 239000007924 injection Substances 0.000 abstract description 19
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 abstract description 5
- 239000011777 magnesium Substances 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000007796 conventional method Methods 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 34
- 238000004519 manufacturing process Methods 0.000 description 29
- 238000001816 cooling Methods 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 239000000454 talc Substances 0.000 description 6
- 235000012222 talc Nutrition 0.000 description 6
- 229910052623 talc Inorganic materials 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910001315 Tool steel Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- QXYJCZRRLLQGCR-UHFFFAOYSA-N dioxomolybdenum Chemical compound O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- -1 TiCrN Chemical compound 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention can achieve each required conditions for thin-wall product using cool-chamber die casting machine, such as injection conditions, metal molding conditions, melting conditions of magnesium alloy, molten metal temperature of magnesium alloy at the gates of cool-chamber die casting machine, and the temperature difference between the molten metal temperature in the warming pot and the molten metal temperature at the gates, and the coating condition on the inner side of the metal mold cavity. The method can be applied to magnesium thin-wall die casting which is not appropriate for the conventional method that the method uses the cool-chamber die casting machine with high injection capacity for high quality thin-wall die casting product; in particular, even for the large area product like the case of notebook PC, the method is able to produce such kind of product having the minimum thickness under 1.5 mm, preferably under 1.2mm which is very difficult for prior art.
Description
The present invention system is about a kind of die-cast method and die cast product of magnesium alloy, more specifically, system is about a kind of use cold house formula die casting machine, below the desired minimum wall thickness (MINI W.) 1.5mm, more satisfactory is the die-cast method and the die cast product of the following casting thin-wall part of 1.2mm from the framework of magnesium alloy cast man electrical article, the various container features of automobile etc.
In recent years, the aspects such as electrical article of being in, since required for reaching the lightweight that improves Portability, more and more higher for the needs of light material, thereby gradually adopt resin material or light metal material.But resin material system generally is difficult to utilize (recycle) again, thereby can throw into question in earth environmental protection.Relative therewith, metal material system generally is easy to utilize again, therefore, the manufactured materials of the framework of family's electrical article, the various container features of automobile etc., then use the light metal of magnesium based material, aluminium based material etc. instead, particularly approach, in the short and little trend, not only have rigidity as metal requiring light by resin material, and the also minimum magnesium based material of density is gazed in practical light metal, and forms as automobile or carry the trend of being gazed at the household electrical appliances product material.Particularly, for the framework of the portable commodity of notes type PC, mobile phone, digital camera, MD walkman (portable stereo walkman), video camera etc., require below the wall thickness 1.5mm, more satisfactory is the following goods of 1.2mm.
In the past, for the manufacturing of casting thin-wall Mg-alloy product, wished to adopt the metal injection moulding mode of hot chamber diecasting mode or thixotropy molding (thixomoulding) etc., and utilize the production of the thin-gage goods of these modes to enlarge rapidly.On the other hand, the cold chamber die casting mode of the another kind of form of die-cast method then generally is identified as the manufacturing that is not suitable for thin-gage goods.
Yet, during with hot chamber diecasting mode cast magnesium alloy, because injecting condition instability, so produce unstable, and about the boundary of thin-walled property, for example, size is for about the framework of about A4 notes type PC when big or small, known thickness is 1.5mm approximately, and when making in the metal injection moulding mode, present situation also is prescribed the minimum wall thickness (MINI W.) of par.
In addition, generally speaking the problem that is produced when desiring cast magnesium alloy in the cold chamber die casting mode, solidifies rapidly owing to magnesium alloy is that latent heat of solidification is little, therefore exists by appearance to be the immobilising state of molten metal.This state can become problem especially in the casting of thin-gage goods.
And, melting loss, abrasion phenomenon take place and cause scab in the many more easy more cavity side surfaces at metal pattern of number of times bit by bit that cast repeatedly in the cold chamber die casting mode, during especially with cold chamber die casting casting casting thin-gage goods, because in order to ensure fillibility to metal pattern, have to cast under high injection pressure, high injection speed, high metal pattern temperature, the high molten metal temperature, thereby in the casting under these conditions, the scab phenomenon to metal pattern can become problem especially.
Given this present invention system plants the problem that is present in conventional art and finishes, the cold house's formula die casting machine that provides a kind of use to think in the prior art not to be suitable for the casting thin-wall of magnesium alloy but have the high injection ability is provided in the present invention, with the casting condition of stably producing high-quality casting thin-wall product as problem.
The inventor etc. have carried out various investigations repeatedly in order to reach above-mentioned problem, under the situation of using cold house's formula die casting machine, self-criticism is the required condition of thin-walled property from many aspects, such as: injecting condition, the metal pattern condition, the melting condition of magnesium alloy, in the magnesium alloy melt temperature of the gate part of cold house's formula die casting machine and the condition that differs between molten metal temperature in the molten metal fireless cooker and molten metal temperature at gate part, and the coating condition of the cavity side inner face of metal pattern etc., found that, even particularly the framework as the notes type PC has large tracts of land person, also can be cast on the conventional art is that difficult goods minimum wall thickness (MINI W.) is below the 1.5mm, more satisfactory is the following die cast product of 1.2mm, and finishes the present invention.
That is the pressure casting method of magnesium alloy of the present invention, system uses cold house's formula die casting machine, is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and better is below the 1.2mm, and there is no that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized by:
A) melt temperature with magnesium alloy remains on 650 to 750 ℃;
B) will be defined as for 1/100 to 10/100 second to the filling speed of die cavity; And
C) supercharging after will filling is defined as 200kgf/cm
2More than.
The pressure casting method of magnesium alloy of the present invention again, system uses cold house's formula die casting machine, is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and better is below the 1.2mm, and there is no that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized by:
D) the metal pattern temperature is remained on 150～350 ℃;
E) the metal pattern surface temperature at the die cavity position of causing draw easily in the die-cast product is reduced more than the 10K than periphery;
Air pressure settings in the metal pattern during f) with die-cast is below 100mmHg; And
G), use to be selected from least a in the group of forming by graphite, boron nitride, waterglass, mica, silica gel, magnesium hydroxide and magnesia as coating the additive of the releasing agent of metal pattern inner face.
The pressure casting method of magnesium alloy of the present invention again, system uses cold house's formula die casting machine, is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and better is below the 1.2mm, and do not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized by:
H) use be formed with on the surface of magnesium alloy liquation prevent to burn, the closed melting furnace of the protective atmosphere of oxidation; And
I) from apart from the position more than the surperficial 100mm of this magnesium alloy liquation, this magnesium alloy molten metal of sucking-off;
To suppress the oxidation of magnesium alloy liquation, improve liquidity whereby, and suppress sneaking into and the generation of casting lap of oxide.
The pressure casting method of magnesium alloy of the present invention again, system uses cold house's formula die casting machine, from magnesium alloy cast goods minimum wall thickness (MINI W.) is below the 1.5mm, better is below the 1.2mm, and there is no that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized by any 2 kinds or 3 kinds of conditions of using simultaneously in 3 kinds of conditions that constitute by following condition and carry out die casting
Injecting condition: (a) the molten metal temperature with magnesium alloy remains on 650 to 750 ℃, (b) will be set at for 1/100 to 10/100 second to the filling speed of die cavity, and (c) supercharging after will filling is set at 200kgf/cm
2
Metal pattern condition: (d) the metal pattern temperature is remained on 150 to 350 ℃, (e) the metal pattern surface temperature at the die cavity position of causing draw easily in the die-cast product is reduced more than the 10K than periphery, air pressure settings in the metal pattern during (f) with die-cast is below 100mmHg, and, use to be selected from least a in the group of forming by graphite, boron nitride, waterglass, mica, silica gel, magnesium hydroxide and magnesia (g) as coating the additive of the releasing agent of metal pattern inner face; And
The melting condition of magnesium alloy: (h) use be formed with on the surface of magnesium alloy molten metal prevent to burn, the closed melting furnace of the protective atmosphere of oxidation, and (i) from apart from the position more than the surperficial 100mm of this magnesium alloy liquation, this magnesium alloy liquation of sucking-off; Whereby with the oxidation that suppresses the magnesium alloy liquation, improve liquidity and suppress sneaking into and the generation of casting lap of oxide.
The pressure casting method of magnesium alloy of the present invention, system uses cold house's formula die casting machine, be below the 1.5mm and do not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab from magnesium alloy cast goods minimum wall thickness (MINI W.), it is characterized by: the melt temperature of the magnesium alloy of the gate part of cold house's formula die casting machine is maintained at 590 to 720 ℃, and the temperature difference of the molten metal temperature of the molten metal temperature in the molten metal fireless cooker and this gate part is maintained at below the 105K.
The pressure casting method of magnesium alloy of the present invention again is to use cold house's formula die casting machine, is below the 1.5mm and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab from magnesium alloy cast goods minimum wall thickness (MINI W.), it is characterized by:
Use is provided with at least a portion on the cavity side surface of metal pattern and contains that to be selected from by at least a coating in refractory metal and the group formed of pottery be to cast to use metal pattern, the molten metal temperature of magnesium alloy is set at 650 to 750 ℃, to be set at for 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy.
The pressure casting method of magnesium alloy of the present invention again, system uses cold house's formula die casting machine, be below the 1.5mm and there is no casting lap from magnesium alloy cast goods minimum wall thickness (MINI W.), face crack, fill bad, the method of the die cast product of metal pattern scab, it is characterized by: use the casting metal pattern, this metal pattern is to be coated with to contain to be selected from by refractory metal at least a portion on the cavity side surface of metal pattern, at least a releasing agent in the group that pottery and graphite are formed as additive, by the formed coating adhesion of heat treated, remain at least a portion on cavity side surface of metal pattern, and the melt temperature of magnesium alloy is set at 650 to 750 ℃, to be set at for 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy.
The pressure casting method of magnesium alloy of the present invention again, system uses cold house's formula die casting machine, be below the 1.5mm and there is no casting lap from magnesium alloy cast goods minimum wall thickness (MINI W.), surface marks, fill bad, the method of the die cast product of metal pattern scab, it is characterized by: use the casting metal pattern, this metal pattern is coated with at least a portion on the cavity side surface of metal pattern and is selected from by refractory metal, at least a and at least a mixture that is selected from the group of forming by surfactant and grease in the group that pottery and graphite are formed, by the formed coating adhesion of heat treated, remain at least a portion on cavity side surface of metal pattern, and the melt temperature of magnesium alloy is set at 650 to 750 ℃, to be set at for 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy.
Die cast product of the present invention again system can above-mentioned any die-cast manufactured minimum product wall thickness be below the 1.5mm, to be preferably below the 1.2mm, casting lap, face crack, filling are bad, the magnesium alloy pressure-casting goods of metal pattern scab and there is no.
Again, in the present invention, so-called die cast product also comprises diecast parts.
Below be described in detail in the kind, pressure casting method of the employed magnesium alloy of pressure casting method of the present invention the coating etc. of cavity side inner face of condition, metal pattern of difference of the molten metal temperature of the melt temperature of magnesium alloy of gate part of melting condition, cold-chamber die casting machine of injecting condition for thin-walled property, metal pattern condition, magnesium alloy and molten metal temperature in the molten metal fireless cooker and gate part.
The magnesium alloy that can cast with pressure casting method of the present invention, but as long as be the magnesium alloy of die casting, then any kind all passable, for example can use MD1A, MD1B, MD1D, MD2A, MD2B, MD3A etc.
In pressure casting method of the present invention, use cold house's formula die casting machine.Use the reason of cold house's formula die casting machine in the present invention, be to be if adopt hot cell formula die casting machine, because its injection member made of iron is submerged in the molten metal, therefore can be because of magnesium alloy liquation melting loss, wearing and tearing, make the unsettled cause of injecting condition because of the adhesion of plunger and sleeve etc. again.Particularly in order to reach thin-walled property, if casting temperature is set at more than 650 ℃, then formula die casting machine in hot cell generally is difficult to carry out casting.Again, even, metal injection moulding, also be difficult to injection temperature be set at 530 ℃ with on implement.
As the injecting condition in the pressure casting method of the present invention the molten metal temperature is arranged.Molten metal temperature in the melting furnace is during less than 650 ℃, then can reduce flowability and having problem on the fillibility of metal pattern.On the other hand, then when keeping molten metal, increase the danger of catching fire when surpassing 750 ℃, owing to can increase, therefore hot tearing or draw take place easily again from the shrinkage factor of molten metal during solidifying.So the molten metal temperature of alloy should remain on 650 to 750 ℃, more satisfactory is 650 to 710 ℃.
Filling speed as the oriented die cavity of injecting condition in the pressure casting method of the present invention.Usually magnesium alloy is little because of its latent heat of solidification, so recommend to improve injection speed.Owing in magnesium alloy, particularly, therefore must apply casting pressure in the full field of foundry goods solidifying the grain boundary portion generation compound that relatively lags behind and crackle taking place easily.Must consider casting speed for this reason and from the balance between the cooling of metal pattern, will be set at for 1/100 to 10/100 second to the filling speed in the metal pattern die cavity on the experience, more satisfactory was 1/100 to 5/100 second.In order to satisfy this kind condition, injection speed should be set at more than the 2m/s, more satisfactory is 3.5m/s, or gate velocity is set at more than the 30m/s, more satisfactory is more than the 50m/s.When the filling speed in the metal pattern die cavity is slower than 10/100 second, can the trend that have problems be arranged in the fillibility (filling bad) or the either side of hot crackability.
As the injecting condition in the pressure casting method of the present invention supercharging after the filling is arranged.Repressurize immediately after the filling in die cavity, bad to prevent to fill, and the hot tearing when suppressing to solidify or cool off or the generation of draw.The supercharging condition of this moment is 200kgf/cm
2More than, more satisfactory is 400kgf/cm
2More than.If when not applying these superchargings, then have and take place to fill bad, or the trend that crackle takes place is arranged at all spectra of the wall thickness change portion of foundry goods.
Above die casting injecting condition is interrelated, is short of the sound thin-section casting that one of these conditions just are difficult to obtain magnesium alloy.Satisfy these three kinds of injecting conditions conversely speaking,, that is
A) melt temperature with magnesium alloy remains on 650 to 750 ℃;
B) 1/100 to 10/100 second will be set to the filling speed of die cavity; And
C) supercharging after will filling is defined as 200kgf/cm
2Above condition can the cast product minimum wall thickness (MINI W.) be below the 1.5mm, and more satisfactory is below the 1.2mm, and does not have that casting lap, face crack, filling are bad, the magnesium alloy die casting of metal pattern scab.
As the metal pattern condition in the pressure casting method of the present invention the metal pattern temperature is arranged.During less than 150 ℃, on the fillibility of molten metal can cause obstacle on the experience in the metal pattern temperature, even or can fill, also can produce the superficiality problem of casting lap etc.Again, if when surpassing 350 ℃, owing to setting rate is easy to generate draw, hot tearing slowly.Therefore the metal pattern temperature should be remained on 150 to 350 ℃, more satisfactory for remaining on 180 to 280 ℃.
As the metal pattern condition in the pressure casting method of the present invention local cooling is arranged.Look the shape of foundry goods, the position of easy generation crackle is arranged in shape in wall thickness sudden turn of events portion etc.Under these situations, except above-mentioned globality metal pattern temperature controlling, also must do the temperature control of locality.This temperature control, can adopt at the necessary position of metal pattern the refrigerant path is set, and impose the method for local cooling at the refrigerant of this path circulation water, oil, air etc., or the method for when opening metal pattern, jet releasing agent or the local cooling of air enforcement etc., no matter any method is all more than the surface temperature cooling 10K of surface temperature than periphery with the position of the local cooling of needs of metal pattern, more satisfactory for more than the cooling 20K, so that taking place easily, the position of draw preferentially solidifies, to prevent draw.
As the metal pattern condition in the pressure casting method of the present invention decompression in the metal pattern is arranged.In order to help the filling of the molten metal in die cavity, prevent that simultaneously the decompression in the metal pattern is necessary because of the mobile disorder of the molten metal that air caused in the metal pattern.In order to reach this purpose, the air pressure settings in the metal pattern when molten metal is injected is below the 100mmHg, and more satisfactory is below the 50mmHg.
As the metal pattern condition in the pressure casting method of the present invention the releasing agent of coating the metal pattern inner face is arranged.About solidifying required cooling condition, be not only the temperature conditions of metal pattern, also can come retarded coagulation and casting pressure is worked by the heat insulation effect of releasing agent.In order to reach this purpose, the additive of releasing agent uses and is selected from least a in the group of being made up of graphite, BN, waterglass, mica, silica gel, magnesium hydroxide and magnesia is effective.
Above metal pattern condition is interrelated, but metal pattern temperature particular importance.When on the die-cast product, having the die cavity position that draw takes place easily, do not need local cooling, local cooling this moment by of the present invention constitute in the necessary condition deleted.According to die cavity shape and die cast product shape, though the decompression in the metal pattern and the additive of releasing agent requirement not necessarily, and constitute necessary condition with this kind and can obtain better result, so more satisfactory.
In the present invention, by satisfying these four kinds of conditions, that is:
D) the metal pattern temperature is remained on 150 to 350 ℃;
E) will reduce more than the 10K than periphery in the mould surface temperature of the metal at the die cavity position of easy generation draw on the die-cast product;
Air pressure settings in the metal die during f) with die-cast is below the 100mmHg; And
G) use as the additive of the releasing agent of coating the metal pattern inner face and be selected from least a in the group of forming by graphite, boron nitride, waterglass, mica, silica gel, magnesium hydroxide and magnesia, can carry out the cast product minimum wall thickness (MINI W.) is below the 1.5mm, more satisfactory is below the 1.2mm, and does not have that casting lap, face crack, filling are bad, the magnesium alloy pressure-casting of metal pattern scab.
As the melting condition of the magnesium alloy of pressure casting method of the present invention, often be provided with and prevent from the surface of magnesium alloy liquation to burn or the protective atmosphere of oxidation.Be this purpose, use in the formation of the surface of magnesium alloy liquation and prevent burning, the closed melting furnace of oxidation protection atmosphere.Prevent to burn, the protective atmosphere of oxidation, for example can enumerate SF
6And SO
2at least aly make an addition to dry air, CO with the above concentration of 0.1 volume %
2, N
2Deng the gas that forms in the gas, or Ar, CO
2, He, Ne, N
2, dry air etc. is inert gasses for the magnesium alloy liquation, and makes these gases in the circulation of the surface of magnesium alloy liquation.If use open melting furnace, then the magnesium alloy liquation can oxidation, and can sneak into because of the oxide that this oxidation produced, or mobile can the deterioration.
When using cold house's formula die casting machine to implement die casting, must be transported to the sleeve part of cold house's formula die casting machine from melting furnace sucking-off molten metal.When the surface element of molten metal is implemented the sucking-off of this molten metal, the anxiety that has oxide or scum silica frost to sneak into.
As the melting condition of the magnesium alloy of pressure casting method of the present invention,, molten metal avoids the surface element that swims of oxide for being drained out, and use pipe to carry out from the position more than surperficial 100mm, in case the sneaking into of oxidation thing.In addition, carry out the position more than the bottom 100mm that wishes to be piled up from distance intermetallic compound etc., to prevent sneaking into of intermetallic compound etc.The automatic pipe that supplies the portion that drains out of molten metal device that also comprises siphon pipe or mechanical pump etc. at this said pipe.
As the melting condition of the magnesium alloy in the pressure casting method of the present invention, the surface of topped melting pot is arranged.Because the reactivity of magnesium alloy liquation and iron is active, and the oxidation of the molten metal of the contact site of crucible surface and molten metal and air is active, therefore on the surface of melting pot, the pot surface element that particularly contacts with the molten metal surface element imposes aluminizes, perhaps coating or metallising BN, TiN perhaps carry out both, suppress the reaction of magnesium alloy liquation and iron, reduce the wettability of pot and molten metal, and suppress pot the oxidation with the molten metal of the contact site of molten metal.
The melting condition of above magnesium alloy is interrelated, prevents sneaking into of oxide owing to implementing draining out of metallic solution as described above, does not therefore need to cover the surface of pot.But, and can obtain better result with such formation necessary condition, thereby be desirable.
In the present invention, these metal pattern conditions, that is
H) use be formed with on the surface of magnesium alloy liquation prevent to burn, the closed melting furnace of the protective atmosphere of oxidation;
I) from carrying out draining out of magnesium alloy molten metal apart from the position more than this magnesium alloy molten surface 100mm,
Optionally, j) on the surface of melting pot, particularly aluminize at the pot surface element that contacts with the molten metal surface element, perhaps coating or spraying plating BN, TiN perhaps carry out both.
Can suppress the oxidation of magnesium alloy liquation thus, improve liquidity, suppress sneaking into of oxide, the generation of casting lap, can carry out the cast product minimum wall thickness (MINI W.) is below the 1.5mm, more satisfactory is below the 1.2mm, and does not have that casting lap, face crack, filling are bad, the magnesium alloy pressure-casting of metal pattern scab.
The pressure casting method of magnesium alloy of the present invention, can and with above-mentioned injecting condition, metal pattern condition, reach any two or three condition in three kinds of conditions of melting condition of magnesium alloy and implement die casting, can obtain better result in the case.
In the of the present invention pressure casting method relevant with the condition of the difference of the molten metal temperature of the melt temperature of the magnesium alloy of the gate part of cold house's formula die casting machine and molten metal temperature in the molten metal fireless cooker and gate part, in order to ensure the flowability of the magnesium alloy liquation in cold house's formula die casting machine and control superficiality, hot tearing or draw, the shrinkage cavity of fillibility, casting product and the high-quality more cheaply magnesium die casting product of manufacturing, importantly the magnesium alloy melt temperature with the gate part of cold house or die casting machine remains on more than 590 ℃.
For the molten metal temperature of gate part is guaranteed more than 590 ℃, then must improve the molten metal temperature in the molten metal fireless cooker (molten metal maintenance stove), but, must avoid above 750 ℃ from guaranteeing security.In addition, since can't avoid the magnesium alloy liquation from the molten metal fireless cooker move to gate part during cooled off, again if the temperature of the molten metal in the molten metal fireless cooker is higher, then the cooling degree of molten metal is bigger, therefore needs extra equipment and extra cost for the cooling degree that reduces this molten metal.Based on this reason, the melt temperature of the magnesium alloy of gate part maintained meet reality below 720 ℃.
Therefore, in pressure casting method of the present invention, the melt temperature of the magnesium alloy of the gate part of cold house's formula die casting machine is maintained 590 to 720 ℃.
And, from the cooling degree of molten metal insulation crucible molten metal of process to the way of gate part when big, process in its way, can in sleeve, the part of magnesium alloy liquation begin to solidify, therefore still can damage the flowability of molten metal, and the degree of oxidation of process also becomes big in this way, therefore for fear of these shortcomings take place, then the temperature difference of the molten metal temperature of the molten metal temperature in the molten metal fireless cooker and this gate part should be remained in the 105K, more satisfactory is to remain in the 60K.
Just discuss for the method that under practical operation, can realize reducing the molten metal cooling degree of process the way from the molten metal fireless cooker to gate part, found that, adopt and to supply with the molten metal system automatically as supplying with molten metal, running gate system, just can with the molten metal fireless cooker in molten metal temperature uniform temp under molten metal is transported to directly over the sleeve.Automatic supply molten metal system like this can adopt siphon mode, mechanical pump mode, decompression or force (forcing) pump mode or electromagnetic pump mode.These automatically supply with the molten metal system is well-known, can directly adopt these well-known automatic supply molten metal systems.
In order to reduce the cooling degree of the molten metal of process the way from the molten metal fireless cooker to gate part, sleeve part with cold house's formula die casting machine, constitute more than the thickness 10mm with the material below thermal conductivity factor 0.085cal/cms ℃, to improve the heat insulating ability in the sleeve part, and this sleeve part heating is remained on more than 100 ℃, more satisfactory is more than 250 ℃, to keep the molten metal temperature of sleeve part.
Can enumerate SKD61 high temperature tool steel (thermal conductivity factor 0.085cal/cms ℃) as these bush materials, perhaps in order to reduce the thermal conductivity coefficient of sleeve part integral body, the pottery of spraying plating low thermal conductivity on these high temperature tool steel, or the pottery and the composite of metal etc., perhaps on these high temperature tool steel, utilize CVD method etc. that TiC, TiCN, CrC, W are set
2Coatings such as C, TiN, TiCrN, CrN, perhaps SiN, Sialon, ZrB
2, Al
2O
3, pottery such as SiC, be compound above-mentioned pottery etc. on the base material at iron system or titanium.
Cooling degree for the molten metal of process reducing from molten metal insulation crucible to the way of gate part, for the molten metal temperature that keeps the runner from down gate to gate part remains on flow path portion more than 150 ℃, more satisfactory for remaining on 180 to 350 ℃, coating simultaneously is selected from least a in the group of being made up of graphite, BN, waterglass, mica, silica gel, magnesium hydroxide and the magnesia of heat insulating ability excellence, and perhaps more than one the releasing agent of coating interpolation in these is also effective.
The pressure casting method of the magnesium alloy of the present invention of aforesaid way, can guarantee the flowability of magnesium alloy liquation, superficiality, hot tearing or draw, the shrinkage cavity of controlling fillibility, casting product, can make high-quality magnesium die casting product more at low cost, for the casting thin-wall below the 1.5mm, particularly effectively for the casting of the thin-walled degree below the 1.2mm.
In the of the present invention pressure casting method employed casting relevant with the coating condition of the cavity side inner face of metal pattern with in the metal pattern, comprise at least a coating of from the group of refractory metal and pottery composition, selecting, be arranged at least a portion on cavity side surface of metal pattern, promptly can be provided with comprehensively, also can only be arranged on the part that is easy to generate scab, become the good casting metal pattern of anti-scab thus.
This kind contains at least a coating that is selected from the group of being made up of refractory metal and pottery, can utilize metalikon, the CVD method, the PVD method, welding method, the any means of finishing etc. is set directly on the surface of at least a portion of cavity side of metal pattern, perhaps for fear of peeling off because of coating that thermal shock produced, can will have the metalikon of utilization on the surface in advance, the CVD method, the PVD method, welding method, the metallic plate of these coatings that any means of finishing etc. is set, adhering to or to be installed on the recess of at least a portion of the die cavity side that is located at metal pattern, with at least a portion of the die cavity side surface that forms metal pattern.
Use in the metal pattern in the employed casting of pressure casting method of the present invention, can similarly carry out and to contain at least a portion on cavity side surface that at least a releasing agent as additive that is selected from the group of being made up of refractory metal, pottery and graphite is coated on metal pattern with the coating of common remover, make formed coating adhere to, remain at least a portion on cavity side surface of metal pattern by heat treated.The coating of this coating, heat treated system of containing the releasing agent of additive and general releasing agent is the implementer additionally, do not need by each injection process coating or heat treated, but, because this coating can consume, therefore contain the releasing agent of additive with the appropriate intervals coating, and it is more satisfactory to carry out heat treated.
And, use in the metal pattern in the employed casting of pressure casting method of the present invention, to be selected from least a in the group of forming by refractory metal, pottery and graphite with any means such as spraying process, spread coatings and be selected from the part on cavity side surface that at least a mixture in the group of being made up of greases such as surfactants such as soap and low boiling oil, waxes is coated on metal pattern, and make formed coating adhere to, remain at least a portion on cavity side surface of metal pattern by heat treated.The coating of this mixture, heat treated need not implemented in each injection process yet.But, because this coating can consume, therefore be coated with this mixture, and carry out comparatively ideal of heat treated with appropriate intervals.
With in the metal pattern, refractory metal is at least a comparatively ideal that is selected from the group that is made of W, Nb, Mo, Ta, Zr and Hf, and pottery is to be selected from by MgO, BN, TiN, TiO in the employed casting of pressure casting method of the present invention
2, SiN, SiC, SiO
2, TiC, WC, MoO
2And ZrO
2At least a comparatively desirable in the group of constituting.But, be not limited to these refractory metals, pottery.
In pressure casting method of the present invention, use cold house's formula die casting machine, use the good magnesium alloy cast metal pattern of above-mentioned anti-scab, the magnesium alloy melt temperature is set at 650 to 750 ℃, more satisfactory is 650 to 710 ℃, filling speed to die cavity was set at for 1/100 to 10/100 second, and more satisfactory was 1/100 to 5/100 second, and the supercharging after filling is set at 200kgf/cm
2More than, more satisfactory is 400kgf/cm
2More than, be 150 to 350 ℃ with the metal pattern temperature measuring, more satisfactory is 180 to 280 ℃, cast magnesium alloy is comparatively desirable.
The pressure casting method of the present invention of aforesaid way to the casting thin-wall below the 1.5mm, particularly, also is effective to the casting thin-wall below the 1.2mm.
Below, specifically describe the present invention according to embodiment and comparative example.Embodiment 1 and comparative example 1～4
Use the Mg-9Al-0.5Zn-0.3Mn series magnesium alloy, use 650 tons of machines of Ube system as cold house's formula die casting machine, the alloy melt temperature is set at 700 ℃, will be set at for 5/100 second to the filling speed of die cavity, the supercharging after filling is set at 500kgf/cm
2, the metal pattern temperature is set at 250 ℃, (result of casting is as shown in table 1 for 210mm * 297mm) and degree of depth 10mm, the casting of the box type preproduction of thickness 1mm (part has the part of 0.8mm) and implement the A4 size.Variation injecting condition as shown in table 1 (injecting condition that is not recorded in table 1 still changes as above-mentioned) is implemented comparative example 1～4.The result of these castings is as shown in table 1.
Table 1
Embodiment 2 and comparative example 5～9
| The injecting condition that changes | The casting result | |
| Embodiment 1 comparative example 1 comparative example 2 comparative examples 3 comparative examples 4 | (on remember standard conditions) 15/100 second supercharging 250kgf/cm of 630 ℃ of filling speeds of 770 ℃ of molten metal temperature of molten metal temperature 2 | Sound die cast product molten metal burns easily, and it is bad that difficult treatment is filled the bad filling of bad filling |
Use the Mg-9Al-0.5Zn-0.3Mn series magnesium alloy, use 650 tons of machines of Ube system as cold house's formula die casting machine.For die cast product being become be easy to generate the shape of draw, at A4 size (210mm * 297mm), degree of depth 10mm, each angle of the box type preproduction of thickness 1mm (part has the part of 0.8mm) is provided with lug boss (Ф 7mm * 5mm), the window (space part) of 50mm * 100mm is set, and becomes the situation that is easy to generate scab to mold cavity inlet portion from cast gate and gate velocity is set at 80m/s etc. sets the strict product that study shape, gate velocity on the whole for for making.
The alloy melt temperature is set at 700 ℃, the supercharging after filling is set at 500kgf/cm
2The metal pattern temperature is set at 250 ℃, the metal pattern temperature of lug boss is set at 230 ℃, and the air pressure settings in the metal pattern during with die casting is the 40mmHg height, and is releasing agent and implement the casting of box type preproduction at the talcum that waterglass is added in metal pattern inner face coating.The result of casting is as shown in table 2.The metal pattern condition is changed (condition that is not recorded in table 2 still changes as above-mentioned) as shown in table 2ly and implement comparative example 5～9.These casting result is as shown in table 2.
Table 2
| The mold condition that changes | The result of casting | |
| Embodiment 2 comparative examples 5 comparative examples 6 comparative examples 7 comparative examples 8 comparative examples 9 | Air pressure 200mmHg in (on remember standard conditions) 245 ℃ of metal patterns of 370 ℃ of metal pattern temperature of metal pattern temperature, 130 ℃ of lug boss metal patterns temperature does not add waterglass | Bad lug boss draw space part top is filled in sound die cast product generation fire check, draw to be had when filling bad the 10th injection and from cast gate to mold cavity inlet section scab occurs |
The talcum of replacement used interpolation waterglass in embodiment 2 is the waterglass of releasing agent, it is beyond the releasing agent that silica gel, magnesium hydroxide or magnesian talcum are added in coating, with embodiment 2 the same terms under carry out die casting, but scab does not all take place in any situation.Embodiment 3 and comparative example 10～12
Use the closed melting furnace to melt the Mg-9Al-0.5Zn-0.3Mn series magnesium alloy, molten metal is maintained 700 ℃, the concentration that passes to 0.2 volume % at this molten metal upper reaches contains SF
6Dry air.Implement draining out of molten metal and supply with cold house's formula die casting machine (650 tons of machines of Ube system) through pipe from position apart from the 150mm of this Metal Melting liquid level.To be set at for 5/100 second to the filling speed of die cavity, the supercharging after filling will be set at 500kgf/cm
2, the metal pattern temperature is set at 250 ℃, and enforcement A4 size (210mm * 297mm), degree of depth 10mm, the casting of the preproduction of the box type of thickness 1mm (part has the part of 0.8mm).The result is as shown in table 3 in casting.Melting condition is changed (condition that is not recorded in table 3 still changes as above-mentioned) as shown in table 3ly and implement comparative example 10～12.These casting result is as shown in table 3.
Table 3
Embodiment 4～7 and comparative example 13～15
| The melting condition that changes | The result of casting | |
| Embodiment 3 comparative examples 10 comparative examples 11 comparative examples 12 | (on remember standard conditions) uses open melting furnace to drain out from the molten metal surface to drain out from the molten metal surface and uses open melting furnace | Sound die cast product molten metal burns easily, the trend that mobile variation is arranged, fill bad, having oxide to sneak at cast(ing) surface has a spot of oxide pick-up metal liquation to burn easily, operability is bad, but belongs to sound die cast product |
Use the melting furnace of closed to melt AZ91 (Mg-9Al-0.7Zn-0.2Mn) alloy, the molten metal temperature (A) in this molten metal fireless cooker is kept as shown in table 4ly.Cold house's formula die casting machine uses 650 tons of machines of Ube system, the sleeve of this die casting machine uses the sleeve of thickness shown in material (MC lies in the cermet of composite S iN pottery on the titanium alloy) shown in the table 4 and the table 4, and is heated to the temperature shown in the table 4 when heating muff.From the automatic supply molten metal system of molten metal insulation crucible to sleeve, adopt siphon mode, when this siphon pipe of heating, be heated to the temperature shown in the table 4.Measure the molten metal temperature of sleeve inlet and the molten metal temperature (B) of gate part.This measurement result is as shown in table 4.The temperature difference (A-B) of the molten metal temperature in the molten metal insulation crucible and the molten metal temperature of gate part also is shown in Table 4.
Table 4
| Molten metal temperature A in the crucible | The pipe heating-up temperature | Molten metal temperature at the sleeve inlet | Bush material/thickness | The sleeve heating-up temperature | Molten metal temperature B at gate part | The temperature difference of A-B | Casting article matter | |
| Embodiment 4 | ??700℃ | ??700℃ | ????700℃ | SKD61/15mm | ?350℃ | ????650℃ | ??50K | Well |
| Comparative example 13 | ??730℃ | Do not have | ????670℃ | SKD61/15mm | Do not have | ????580℃ | ??150K | Fill bad |
| Embodiment 5 | ??730℃ | ??730℃ | ????730℃ | SKD61/15mm | Do not have | ????630℃ | ??100K | Well |
| Comparative example 14 | ??700℃ | ??700℃ | ????700℃ | SKD61/15mm | Do not have | ????580℃ | ??120K | Fill bad |
| Embodiment 6 | ??670℃ | ??670℃ | ????670℃ | MC/15mm | ?400℃ | ????630℃ | ??40K | Well |
| Embodiment 7 | ??730℃ | Do not have | ????670℃ | MC/15mm | ?400℃ | ????630℃ | ??100K | Well |
| Comparative example 15 | ??670℃ | Do not have | ????610℃ | MC/15mm | ?400℃ | ????560℃ | ??110K | Following note annotates 1 |
Annotate 1: in the occasion of comparative example 15, the molten metal extreme difference that flows is filled bad.
Be set at 250 ℃ in the metal pattern temperature, the air pressure settings in the metal pattern during with die casting is 40mmHg, will be set at 5/100 second to the filling speed of die cavity, and the supercharging after filling is set at 500kgf/cm
2, and be releasing agent (Japanese Hua Ye Itochu system), and implement A4 size (210mm * 297mm), degree of depth 10mm, the casting of the preproduction of the box type of thickness 1mm (part has the part of 0.8mm) at metal pattern inner face coating talcum.The result of casting is as shown in table 4.The casting Production Example 1 of metal pattern
Preparation can be for casting A4 size (210mm * 297mm), degree of depth 10mm, the preproduction of the box type of thickness 1mm (part has the part of 0.8mm), and form molten metal at gate part and then with the metal pattern of the shape on the cavity side surface of the direct contacting metal mould of near normal.At talcum is the MgO powder of amount that adds 10 weight % of the weight be equivalent to releasing agent in the releasing agent, this mixture is coated the cavity side surface of metal pattern and then be easy to generate the molten metal of gate part of scab with the direct zone of contact of near normal, and carry out heat treated with burner, this regional coating is adhered to, is residued in formation, and obtains the casting metal pattern for pressure casting method use of the present invention.The casting Production Example 2 of metal pattern
Use and the Production Example 1 employed metal pattern identical shaped metal pattern of casting, replace casting to use BN, TiN, TiO with the Production Example 1 employed MgO powder of metal pattern with metal pattern
2, SiN, SiC, SiO
2, TiC, WC, MoO2 or ZrO
2Powder, and impose and cast with the same processing of the Production Example 1 of metal pattern, obtain employed casting metal pattern in pressure casting method of the present invention.The casting Production Example 3 of metal pattern
Add the BN powder at suds, this mixture is coated on and casts zone with the gate part that is easy to generate scab on the and then cavity side surface of the identical shaped metal pattern of the Production Example 1 employed metal pattern of metal pattern, and carry out heat treated with burner, this regional coating is adhered to, is remained in formation, and obtains the casting metal pattern in pressure casting method use of the present invention.The casting Production Example 4 of metal pattern
Use and the Production Example 1 employed metal pattern identical shaped metal pattern of casting, replace casting to use MgO, TiN, TiO with the Production Example 3 employed BN powder of metal pattern with metal pattern
2, SiN, SiC, SiO
2, TiC, WC, MoO
2Or ZrO
2Powder, and impose and cast with the same processing of the Production Example 3 of metal pattern, obtain employed casting metal pattern in pressure casting method of the present invention.The casting Production Example 5 of metal pattern
Use and the Production Example 1 employed metal pattern identical shaped metal pattern of casting, but the metal pattern that does not have coating with the cavity side surface at metal pattern is as employed metal pattern in comparative example with metal pattern.The casting Production Example 6 of metal pattern
Preparation can be for the preproduction of the box type of casting 100mm * 100nn, degree of depth 7mm, thickness 0.8mm, and form molten metal at gate part and then with the metal pattern of the shape on the cavity side surface of the direct contacting metal mould of near normal.Form the shallow recess of the even degree of depth in the zone of the cast gate of the scab that is right after the cavity side surface that this metal pattern is easy to generate.On the other hand, form the coating that is constituted by TiCN (mixture of TiC and TiN) through the CVD method on the iron plate surface that has the flat shape identical and have the thickness (stricter, as when coating is set, can to become identical thickness) approximately identical with this concave depth with the flat shape of this recess.The casting metal pattern that this iron plate is embedded in the above-mentioned recess and obtain in pressure casting method of the present invention, using.Casting is from the Production Example 7 of metal pattern
Be and the Production Example 6 employed metal patterns identical shaped metal pattern of casting, but embed the metal pattern of recess as the metal pattern that in comparative example, uses with the iron plate that does not have coating on the surface with metal pattern.Comparative example 16
Use AZ91 (Mg-9Al-0.7Zn-0.2Mn) series magnesium alloy, cold house's formula die casting machine then uses 650 tons of machines of japanese character portion system, use the metal pattern of casting with the Production Example 5 of metal pattern, is releasing agent (Japanese Hua Ye Itochu system) on the cavity side surface of metal pattern at the talcum of injection process coating each time, the alloy melt temperature is set at 700 ℃, to be set at for 3/100 second to the filling speed of die cavity, the supercharging after filling will be set at 500kgf/cm
2, the metal pattern temperature is set at 300 ℃, and enforcement A4 size (210mm * 297mm), degree of depth 10mm, the casting of the reagent product of the box type of thickness 1mm (part has the part of 0.8mm).In casting in the 3rd injection process scab takes place.Embodiment 8
Remove the metal pattern that the Production Example 5 of metal pattern is used in the casting that replaces use in comparative example 16, and use beyond the metal pattern that in the Production Example 1 of casting, obtains, similarly cast with comparative example 16 with metal pattern.In this casting in the 52nd injection process scab takes place.Embodiment 9
Remove the metal pattern that the Production Example 5 of metal pattern is used in the casting that replaces use in comparative example 16, and use beyond the metal pattern that in the Production Example 3 of casting, obtains, similarly cast with comparative example 16 with metal pattern.In this casting in the 63rd injection process scab takes place.Comparative example 18
Use AZ91 (Mg-9Al-0.7Zn-0.2Mn) alloy, use hot cell formula die casting machine, use the metal pattern of casting with the Production Example 7 of metal pattern, in per injection, the cavity side of metal pattern surface coating water-soluble mold-release agent (Japanese Hua Ye Itochu system), the alloy melt temperature is set at 630 ℃, 3/100 second will be set to the filling speed of die cavity, the metal pattern temperature is set at 200 ℃, and implement with 100mm * 100mm, degree of depth 7mm, the casting of the preproduction of the box type of thickness 0.8mm.In this casting in the 250th injection process scab takes place.Embodiment 10
Remove the metal pattern that the Production Example 7 of metal pattern is used in the casting that replaces use in comparative example 18, and use beyond the metal pattern that in the Production Example 6 of casting, obtains, similarly cast with comparative example 18 with metal pattern.Though in this casting, implement the casting of 10000 injections, scab does not take place, implement casting serially.
According to pressure casting method of the present invention, can stably carry out the cast product minimum wall thickness (MINI W.) from magnesium alloy is below the 1.5mm, more satisfactory is below the 1.2mm, and do not have that casting lap, face crack, filling are bad, the manufacturing of the high-quality die cast product of metal pattern scab, the wall thickness that the present invention system particularly can be used in portable commodity such as subnotebook PC, mobile phone, digital camera, MD walkman, video camera is below the 1.5mm, and more satisfactory is the casting of the following framework of 1.2mm.
Claims (16)
1. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
A) melt temperature with magnesium alloy remains on 650 to 750 ℃;
B) 1/100 to 10/100 second will be set to the filling speed of die cavity; And
C) supercharging after will filling is set at 200kgf/cm
2More than.
2. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
D) the metal pattern temperature is remained on 150～350 ℃;
E) making easily, the metal pattern surface temperature periphery at the die cavity position of causing draw on the die-cast device reduces more than the 10K;
Air pressure settings in the metal pattern during f) with die-cast is below the 100mmHg; And
G), use to be selected from least a in the group of forming by graphite, boron nitride (BN), waterglass, mica, silica gel, magnesium hydroxide and magnesia as additive to the releasing agent of coating the metal pattern inner face.
3. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
H) use be formed with on the surface of magnesium alloy liquation prevent to burn, the closed melting furnace of the protective atmosphere of oxidation; And
I) from apart from the position more than the surperficial 100mm of this magnesium alloy liquation, this magnesium alloy liquation of sucking-off,
Suppress the oxidation of magnesium alloy liquation whereby, improve liquidity, and suppress sneaking into and the generation of casting lap of oxide.
4. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and there is no that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that, use any 2 kinds or 3 kinds of conditions in 3 kinds of conditions that constitute by following condition to carry out die casting simultaneously
Injecting condition: (a) melt temperature with magnesium alloy remains on 650 to 750 ℃, (b) will be set at for 1/100 to 10/100 second to the filling speed of die cavity, and (c) supercharging after will filling is set at 200kgf/cm
2More than;
Metal pattern condition: (d) the metal pattern temperature is remained on 150 to 350 ℃, (e) making easily, the metal pattern surface temperature at the die cavity position of causing draw on the die-cast product reduces more than the 10K than periphery, air pressure settings in the metal pattern during (f) with die-cast is below the 100mmHg, and, use to be selected from least a in the group of forming by graphite, boron nitride, waterglass, mica, silica gel, magnesium hydroxide and magnesia (g) as additive to the releasing agent of coating the metal pattern inner face; And
The melting condition of magnesium alloy: (h) use be formed with on the surface of magnesium alloy liquation prevent to burn, the closed melting furnace of the protective atmosphere of oxidation, and (i) from apart from the position more than the surperficial 100mm of this magnesium alloy liquation, this magnesium alloy liquation of sucking-off; Suppress whereby the magnesium alloy liquation oxidation, improve liquidity and suppress sneaking into and the generation of casting lap of oxide.
5. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and there is no that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
The melt temperature of the magnesium alloy of the gate part of cold house's formula die casting machine is maintained at 590 to 720 ℃, and the temperature difference of the molten metal temperature of the molten metal temperature in the molten metal fireless cooker and this gate part is maintained at below the 105K.
6. the described pressure casting method of claim 5 is characterized in that, as from the system of molten metal fireless cooker to the sleeve supply magnesium alloy liquation of cold house's formula die casting machine, is the use siphon mode, mechanical pump mode, decompression or force (forcing) pump mode, or electromagnetic pump mode.
7. the described pressure casting method of claim 5 is characterized in that, is the sleeve of the material formation cold house formula die casting machine below 0.085cal/cms ℃ with the thermal conductivity factor, and the thickness of this sleeve is more than the 10mm, and this sleeve part heating is remained on more than 100 ℃.
8. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
Use the casting metal pattern, on at least a portion on the cavity side surface of this metal pattern, be provided with and contain at least a coating that is selected from the group of forming by refractory metal and pottery, and the melt temperature of magnesium alloy is set at 650 to 750 ℃, to be set at for 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy.
9. the described pressure casting method of claim 8, it is characterized in that, use in the metal pattern in casting, have in the surface and to comprise the metallic plate that is selected from by at least a coating in refractory metal and the group that constitutes of pottery, adhere to, be installed at least a portion of die cavity side of metal pattern, with at least a portion on the cavity side surface that forms metal pattern.
10. the described pressure casting method of claim 8 is characterized in that, with in the metal pattern, coating is to utilize metalikon, CVD method, PVD method, welding method or finishing to form in casting.
11. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
Use the casting metal pattern, coating contains at least a releasing agent as additive that is selected from the group of being made up of refractory metal, pottery and graphite at least a portion on the cavity side surface of this metal pattern, make formed coating adhere to, remain at least a portion on cavity side surface of metal pattern by heat treated, and the melt temperature of magnesium alloy is set at 650 to 750 ℃, to be set at for 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy.
12. the pressure casting method of a magnesium alloy, it is to use cold house's formula die casting machine is below the 1.5mm from magnesium alloy cast goods minimum wall thickness (MINI W.), and does not have that casting lap, face crack, filling are bad, the method for the die cast product of metal pattern scab, it is characterized in that,
Use the casting metal pattern, coating is selected from least a of the group is made up of refractory metal, pottery and graphite and is selected from least a mixture of the group of being made up of surfactant and grease at least a portion on the cavity side surface of this metal pattern, make formed coating adhere to, remain at least a portion on cavity side surface of metal pattern by heat treated, and the melt temperature of magnesium alloy is set at 650 to 750 ℃, to be set at 1/100 to 10/100 second to the filling speed of die cavity, the supercharging after filling will be set at 200kgf/cm
2More than, the metal pattern temperature is set at 150 to 350 ℃ carries out cast magnesium alloy
13. any one described pressure casting method is characterized in that in the claim 8 to 12, with in the metal pattern, refractory metal is to be selected from least a in the group that is made of W, Nb, Mo, Ta, Zr and Hf in casting, and pottery is to be selected from by MgO, BN, TiN, TiO
2, SiN, SiC, SiO
2, TiC, WC, MoO
2And ZrO
2At least a in the group that constitutes.
14. any one described pressure casting method is characterized in that in the claim 1 to 12, the cast product minimum wall thickness (MINI W.) is the following die cast product of 1.2mm.
15. the die cast product of a magnesium alloy, it is characterized in that can enough claims 1 to 12 in any one described pressure casting method make, the goods minimum wall thickness (MINI W.) is below the 1.5mm, and does not have that casting lap, face crack, filling are bad, the magnesium alloy pressure-casting goods of metal pattern scab.
16. the die cast product of a magnesium alloy, it is characterized in that can enough claims 14 pressure casting method make, the goods minimum wall thickness (MINI W.) is below the 1.2mm, and does not have that casting lap, face crack, filling are bad, the magnesium alloy pressure-casting goods of metal pattern scab.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156736/99 | 1999-06-03 | ||
| JP156736/1999 | 1999-06-03 | ||
| JP11156736A JP2000343201A (en) | 1999-06-03 | 1999-06-03 | Die casting method of magnesium alloy and die casting product |
| JP18307599A JP3326140B2 (en) | 1999-06-29 | 1999-06-29 | Magnesium alloy die casting and die casting products |
| JP183075/1999 | 1999-06-29 | ||
| JP183075/99 | 1999-06-29 | ||
| JP187485/1999 | 1999-07-01 | ||
| JP187485/99 | 1999-07-01 | ||
| JP18748599 | 1999-07-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1276275A true CN1276275A (en) | 2000-12-13 |
| CN1096904C CN1096904C (en) | 2002-12-25 |
Family
ID=27321042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99122855A Expired - Fee Related CN1096904C (en) | 1999-06-03 | 1999-11-30 | Magnesium alloy pressure die casting method and articles |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100438392B1 (en) |
| CN (1) | CN1096904C (en) |
| TW (1) | TW407079B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773407A (en) * | 2012-07-18 | 2012-11-14 | 明志科技大学 | Method for improving demoulding effect of metal casting mould |
| CN102886505A (en) * | 2012-10-30 | 2013-01-23 | 常州华晨铸造有限公司 | Die casting process for magnesium alloy stent parts |
| CN105081260A (en) * | 2015-09-06 | 2015-11-25 | 无锡贺邦金属制品有限公司 | Die-casting process for roller support of washing machine |
| CN105170936A (en) * | 2015-09-06 | 2015-12-23 | 无锡贺邦金属制品有限公司 | Aluminium alloy metal piece vacuum pressing technology |
| CN111182752A (en) * | 2019-12-30 | 2020-05-19 | 贵州新蓝辉金属制品有限公司 | Radiator case for magnetic suspension train and casting method thereof |
| CN112457693A (en) * | 2020-11-19 | 2021-03-09 | 西安理工大学 | Magnesium alloy plate alkali-resistant coating material and preparation method and application thereof |
| CN112496254A (en) * | 2020-11-13 | 2021-03-16 | 龙口市大川活塞有限公司 | Heat-preservation demolding coating for casting |
| CN112899664A (en) * | 2021-01-27 | 2021-06-04 | 太原科技大学 | Magnesium alloy surface zirconia-based film and preparation method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4772365B2 (en) * | 2005-04-15 | 2011-09-14 | 株式会社東芝 | Case forming method |
| US7727490B2 (en) | 2007-08-17 | 2010-06-01 | Uop Llc | Aromatic production apparatus |
| JP4292224B2 (en) * | 2007-12-14 | 2009-07-08 | 株式会社東芝 | Manufacturing method of molds and castings |
| TWI472388B (en) * | 2009-12-01 | 2015-02-11 | Metal Ind Res & Dev Ct | Casting with metal insert and its manufacturing method |
| CN101880788B (en) * | 2010-06-02 | 2012-02-15 | 太原理工大学 | Method for enhancing SiC particle grinding of magnesium aluminum alloy |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058016A (en) * | 1991-07-03 | 1993-01-19 | Kubota Corp | Device for carrying molten metal |
| US5409531A (en) * | 1992-07-01 | 1995-04-25 | Hitachi Powdered Metals Co., Ltd. | Releasing agent for die casting |
| AU4617796A (en) * | 1995-02-17 | 1996-09-04 | Institute De La Technologie Du Magnesium, Inc | Creep resistant magnesium alloys for die casting |
| US5630464A (en) * | 1995-11-03 | 1997-05-20 | Spartan Light Metal Products, Inc. | Cold chamber magnesium pump assembly |
| JP3229954B2 (en) * | 1996-02-27 | 2001-11-19 | 本田技研工業株式会社 | Heat resistant magnesium alloy |
-
1999
- 1999-08-03 TW TW088113210A patent/TW407079B/en active
- 1999-08-06 KR KR10-1999-0032272A patent/KR100438392B1/en not_active IP Right Cessation
- 1999-11-30 CN CN99122855A patent/CN1096904C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773407A (en) * | 2012-07-18 | 2012-11-14 | 明志科技大学 | Method for improving demoulding effect of metal casting mould |
| CN102886505A (en) * | 2012-10-30 | 2013-01-23 | 常州华晨铸造有限公司 | Die casting process for magnesium alloy stent parts |
| CN105081260A (en) * | 2015-09-06 | 2015-11-25 | 无锡贺邦金属制品有限公司 | Die-casting process for roller support of washing machine |
| CN105170936A (en) * | 2015-09-06 | 2015-12-23 | 无锡贺邦金属制品有限公司 | Aluminium alloy metal piece vacuum pressing technology |
| CN111182752A (en) * | 2019-12-30 | 2020-05-19 | 贵州新蓝辉金属制品有限公司 | Radiator case for magnetic suspension train and casting method thereof |
| CN112496254A (en) * | 2020-11-13 | 2021-03-16 | 龙口市大川活塞有限公司 | Heat-preservation demolding coating for casting |
| CN112457693A (en) * | 2020-11-19 | 2021-03-09 | 西安理工大学 | Magnesium alloy plate alkali-resistant coating material and preparation method and application thereof |
| CN112899664A (en) * | 2021-01-27 | 2021-06-04 | 太原科技大学 | Magnesium alloy surface zirconia-based film and preparation method thereof |
| CN112899664B (en) * | 2021-01-27 | 2022-08-02 | 太原科技大学 | Magnesium alloy surface zirconia-based film and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW407079B (en) | 2000-10-01 |
| CN1096904C (en) | 2002-12-25 |
| KR100438392B1 (en) | 2004-07-02 |
| KR20010005429A (en) | 2001-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1096904C (en) | Magnesium alloy pressure die casting method and articles | |
| CN105458182B (en) | A kind of casting method of volute | |
| CN100453206C (en) | Process of making oil cylinder body and cover with aluminium alloy | |
| CN104259438A (en) | Copper-steel bimetal casting improved technology | |
| EP1060817B1 (en) | Pressure die-casting process of magnesium alloys | |
| CN1817507A (en) | Cast exudation of investment casting mould | |
| CN105018766B (en) | A kind of high content of magnesium casts the smelting and pouring process of almag | |
| CN105772691A (en) | Integrated forming device and method for aluminum matrix composite thin-walled pieces | |
| CN106270430A (en) | The semi-continuous casting method of aluminum based composite material enhanced by granules in situ | |
| CN112481517A (en) | Preparation method of ceramic particle reinforced aluminum alloy | |
| CN100389910C (en) | Ladle neck bush pouring technique | |
| CN109824370B (en) | Composite multilayer crucible for beryllium-aluminum alloy induction smelting and preparation method thereof | |
| CN1191901C (en) | Casting and casting appts. | |
| CN101347899A (en) | Method for molding long and thin hole on large-sized section casting parts using mineral carbon | |
| JP2012148293A (en) | Method of casting ingot | |
| CN100457322C (en) | Method for improving ingot surface quality | |
| CN2564968Y (en) | Metal smelting furnace | |
| CN104609871A (en) | Composite rotor for refining and degassing of molten aluminum and preparation method of composite rotor | |
| JP4350212B2 (en) | Manufacturing method of high corrosion resistance casting of magnesium alloy and high corrosion resistance casting | |
| CN108188369A (en) | A kind of semi-solid rheological molding method and device | |
| CN106392037A (en) | Direct casting technology for pure aluminum metal mold | |
| CN102896291A (en) | Front cover of car air conditioner compressor FS170C and casting method of front cover | |
| JP2000343201A (en) | Die casting method of magnesium alloy and die casting product | |
| CN110656256A (en) | Aluminum casting machining process | |
| JP4596580B2 (en) | Magnesium alloy casting method and castings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021225 Termination date: 20091230 |