WO2004045791A1 - コールドチャンバダイカスト成形機の射出装置及びその計量方法 - Google Patents
コールドチャンバダイカスト成形機の射出装置及びその計量方法 Download PDFInfo
- Publication number
- WO2004045791A1 WO2004045791A1 PCT/JP2003/014690 JP0314690W WO2004045791A1 WO 2004045791 A1 WO2004045791 A1 WO 2004045791A1 JP 0314690 W JP0314690 W JP 0314690W WO 2004045791 A1 WO2004045791 A1 WO 2004045791A1
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- Prior art keywords
- billet
- melting
- cylinder
- molten metal
- injection
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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
- B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
-
- 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
- B22D17/20—Accessories: Details
- B22D17/28—Melting pots
-
- 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
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S164/00—Metal founding
- Y10S164/90—Rheo-casting
Definitions
- the present invention relates to an injection device for a cold-champer die-casting molding machine, and in particular, to supply a light metal material to a melting device in the form of a cylindrical short rod-shaped billet to melt the molten metal, pour the molten metal from the melting device into a plunger injection device, and measure it.
- a method for weighing the cold champ die casting machine
- Injection molding machines for light metal alloys such as magnesium, aluminum and zinc are generally called die-casting molding machines and are broadly classified into hot chamber systems and cold chamber systems.
- the injection device is placed on the melting furnace, and one shot of the light metal material melt is sucked from the melting furnace into the injection sleeve of the injection device, and the molten metal is measured in the injection sleeve.
- This is a method of injecting into a mold by a plunger. In this method, high-temperature molten metal is supplied stably to the injection sleeve.
- the latter cold chamber method is a method in which an injection sleep is provided outside the melting furnace, the molten metal of the light metal material in the melting furnace is measured on an injection sleeve by a ladle or a pump, and the molten metal is injected by a plunger.
- this method maintenance is easy because the injection unit is separated from the melting furnace.
- the melting furnace has a large capacity compared to the capacity of the molded product, and the running cost during the molding operation must be large in order to maintain a large amount of molten metal in a predetermined heating state.
- the maintenance work of the melting furnace must be performed in one day.
- the molding material is a magnesium alloy
- maintenance work to remove sludge mainly from oxides in the melting furnace from time to time is indispensable because magnesium in the molten state is very oxidized and easily ignites. Absent. Due to the large surface area of the molten metal in the melting furnace, the generation of the above-mentioned sludge cannot be sufficiently suppressed even if an inert gas is injected into the furnace due to the flame-retardant flux for preventing ignition and oxidation. It is. Moreover, this sludge increases the wear of the injection sleeve and the plunger. Therefore, an injection device capable of directly supplying a molding material without using a furnace has been proposed.
- this injection apparatus is an injection device provided with a material supply device capable of supplying a light metal material in the form of a cylindrical short rod.
- This injection apparatus is generally an apparatus for filling a mold in a semi-solid state with a molding material. According to this injection device, not only the problem of the melting furnace described above can be solved, but also, especially when the molding material is a magnesium alloy, the oxidation is greatly reduced.
- a heating cylinder for accommodating a plurality of ingots formed in advance by another molding device to a size of one shot of injection molding and preheating, and a plunger are included.
- an apparatus including an injection sleeve and a chute for transferring an ingot from a heating cylinder to the injection sleeve (for example, see Patent Document 1 in which the title is described later).
- the ingot heated and softened by the heating cylinder is transferred to the injection sleeve, and the material in the semi-melted state by the injection sleeve is pressed by the plunger and injected into the mold.
- Another one of the devices there is a device provided with a shaping hole for shaping a billet corresponding to an ingot into a diameter suitable for the inner diameter of the injection sleeve and a cutter plate at the end of the heating sleeve as the heating cylinder (Patent Document 1). 2).
- the outside diameter of the billet is adjusted to the inside diameter of the injection sleeve, and the length of the billet is shaped to one shot size. The problem of the increase and the complexity of setting the preheating conditions corresponding thereto is solved. This is because it is not necessary to prepare an ingot for each molded product in advance.
- Patent Document 3 an injection device different from the above method has been proposed (see Patent Document 3).
- This injection device is equipped with a heating cylinder consisting of a high-temperature side cylinder on the molding die side (tip side close to the mold), a low-temperature side cylinder on the rear side, and a heat-insulating cylinder between them.
- This is a device that inserts the molding material molded into the above-mentioned heating cylinder, melts it in the high-temperature side cylinder portion, and injects the molten molten metal by the unmelted molding material.
- This molding material is named a self-consuming plunger because it is injected with the molding material itself rather than the plunger.
- Such an injection device does not include a melting furnace, the configuration around the injection device is simplified and efficient melting is enabled. In addition, since no plunger is provided, it is possible to reduce wear on the ejection sleeve and to perform maintenance and inspection in a short time.
- Patent Document 4 mainly discloses a projection device for preventing galling in glass molding.
- Patent Document 1 is Japanese Patent Publication No. 2639555 (particularly from column 4, line 18 to column 5, line 3, FIG. 2).
- No. 2 is Japanese Patent Application Laid-Open No. 2000-191911 (especially claim 1, see FIG. 1)
- Patent Document 3 is Japanese Patent Application Laid-Open No. 5-21212531 (especially claim 1, and FIG. 1)
- Patent Document 4 is Japanese Patent Application Laid-Open No. H5-2525858 (especially claim 1, FIG. 1).
- both the hot-champer type and the cold-chamber type injection devices have the above-mentioned problems of the melting furnace.
- the injection devices of Patent Document 1 and Patent Document 2 which do not include a melting furnace are not devices for injecting a molding material into a completely molten metal and injecting it. There is a restriction that it is not suitable. If the molding material is to be completely melted and the injection is to be performed after exceeding this restriction, a waiting time for completely changing the molding material to a molten state by the injection sleeve is required.
- Patent Document 3 adopting the self-consuming plunger does not describe the length of the molding material and the supply of the molding material, and the following phenomena may possibly occur. Nevertheless, the solution is not disclosed.
- the phenomenon is that during injection molding, high-pressure, low-viscosity molten metal backflows into the gap between the injection sleeve and the self-consumption type plunger and solidifies, and the solidified material fills the gap between the two to significantly increase frictional resistance. As a result, the movement of the plunger is hindered and the injection operation becomes impossible. This is because the injection device is both a melting device and an injection device, so that the molten metal must have a high pressure.
- the phenomenon becomes more pronounced when the self-consuming plunger is inserted into a horizontally arranged injection sleeve, with the gap between them increasing on the upper side.
- Self-consumable plungers must be made smaller than the inner diameter of the injection sleeve in anticipation of their thermal expansion.
- the phenomenon is It is even more pronounced that the material is destroyed or reformed during the injection operation and grows more extensively and firmly. In particular, in the injection molding of a thin and complex shape, the above phenomenon becomes more remarkable because the injection is performed at a high speed and a high pressure.
- Patent Document 4 does not solve the above-mentioned phenomenon in light metal molding, because it discloses a technique for preventing galling in glass molding.
- the above-described galling prevention technology is a technology that simply forms a large number of grooves or spiral grooves on the cylinder side and cools through the grooves to promote cooling of the molding material.
- glass is relatively wide. Since it exhibits a high-viscosity softened state in the temperature range, the molten metal does not immediately fill the above-mentioned grooves, and it is presumed that the functions and effects of the above-mentioned grooves and the like are actually exerted.
- the present invention eliminates the need for the melting furnace of the injection device of the conventional cold chamber die casting molding machine, and supplies the light metal material in the form of a billet to inject the molding material into the injection sleeve in a molten state.
- An injection device for a cold chamber die casting molding machine is a cold channnel having a plunger injection device for supplying a molten metal of a light metal material to a material supply port opened at an upper portion of an injection sleeve and injecting the molten metal by a plunger.
- a plunger injection device for supplying a molten metal of a light metal material to a material supply port opened at an upper portion of an injection sleeve and injecting the molten metal by a plunger.
- a melting device for melting the light metal material, and a pouring member for pouring molten metal from the melting device to the plunger injection device;
- the melting device supplies the light metal material in the form of a cylindrical short rod-shaped billet to supply a molding material, and a billet supply device located at the rear of the billet supply device.
- a billet insertion device having a pusher which pushes the billet forward while retracting at least a distance exceeding the length of one billet, and which is pushed forward by the pusher located in front of the billet supply device.
- a melting cylinder for accommodating the plurality of billets and melting the billets from the tip side first to produce molten metal for several shots,
- the pouring member includes a pouring hole for pouring the molten metal from a front end of a cylinder hole of the melting cylinder to the material supply port of the injection sleep;
- the melting device pushes the pusher through the billet to supply one shot of the molten metal to the injection sleeve so that the molten metal is measured. It is composed.
- the melting device of the injection device of the present invention can replenish the light metal material with a short rod-shaped billet, melt the billet by a minimum amount, and supply the molten metal to the injection sleeve. Supply. Therefore, not only is the heating energy required to melt the molten metal in the melting device small and efficient, but the temperature of the melting cylinder can be raised and solidified in a short time, so that the maintenance work of the injection device can be done quickly.
- the size of the melting equipment is much smaller than that of a conventional melting furnace.
- the light metal material is supplied in the form of billets, its handling is easy.
- the billet is a magnesium material, there is an advantage that the billet is hardly oxidized.
- the melting cylinder is constituted by a first melting cylinder, and most of the cylinder holes of the first melting cylinder except at least a base end thereof are formed.
- a cylinder hole at the base end of the first melting cylinder is formed with an inner diameter that abuts against the enlarged diameter side surface of the unmelted tip of the billet to the extent that the pack flow of the molten metal is prevented.
- the inner diameter is preferably slightly larger than the outer diameter.
- the melting device is constituted by the first melting cylinder, and most of the cylinder holes except for at least the base end of the first melting cylinder are filled with molten metal at the time of measurement. Is formed to an inner diameter that abuts the enlarged side surface at the tip of the billet to such an extent that the backflow of the billet is prevented, and the cylinder hole at the base end is formed to an inner diameter slightly larger than the outer diameter of the billet. Therefore, the enlarged side surface functions as a “diameter seal” that not only prevents leakage of the molten metal to the rear and intrusion of air and the like into the molten metal, but also functions as a seal with low frictional resistance. And because the first melting cylinder and the pusher do not contact each other There is almost no wear, making maintenance work of the melting equipment easier. Such a melting cylinder is effective when used in a small injection molding machine because of its simple structure.
- the melting device of the injection device of the cold-champer die casting molding machine according to the present invention includes:
- the cooling member has a through hole having an inner diameter slightly larger than the outer diameter of the billet, and a cooling passage around the through hole;
- the cooling sleeve may be configured to have an annular groove on an outer periphery of the billet to produce an annular solidified product of the molten metal by cooling the molten metal.
- the melting device includes a cooling sleeve positioned between the second melting cylinder and the cooling member, and the cooling member is slightly larger than the outer diameter of the billet. It has a through hole with an inner diameter, a cylinder hole of the second melting cylinder is formed in an inner diameter that does not abut against the tip of the billet, and a cooling sleeve cools at least the molten metal to form an annular solidified material that is a solidified material of the molten metal.
- annular solidified material has an annular groove
- the annular solidified material satisfactorily prevents leakage of the molten metal backward and intrusion of air and the like into the molten metal as an annular solidified material seal J, as well as low frictional resistance. Also works as a seal.
- Melting cylinders are particularly effective when used in large injection molding machines, as well as in small injection molding machines.
- the pouring hole of the pouring member of the injection device communicates with a communication passage opening above the cylinder hole of the melting cylinder. It is preferable to be configured to be disposed in an inclined posture in which the tip portion is at a high position.
- the pouring hole of the pouring member communicates with the communication passage opened above the cylinder hole of the melting cylinder, and the tip of the melting cylinder is at a high position. As it is placed in an inclined position, the air and gas remaining in the first inner melting cylinder are quickly purged, as well as the molten metal in the melting cylinder. The outflow phenomenon is prevented and the weighing becomes accurate.
- a valve stem that moves up and down in the pouring hole of the pouring member to open and close a substantially lower end of the pouring hole, and measures the valve stem
- An opening / closing device including a valve stem driving device that is opened only at times may be provided.
- the valve stem opens the lower end of the pouring hole only at the time of weighing, unexpected melting of the molten metal in the pouring hole is prevented, and the weighing becomes accurate.
- the opening and closing operation of the pouring hole of the opening and closing device and the pusher By performing the operations of pushing out the molten metal substantially simultaneously, the measurement may be performed in a state where the molten metal is always stored in the pouring hole.
- FIG. 1 is a side view showing a cross section of the entire configuration of an injection device of a cold chamber die casting molding machine according to the present invention.
- FIG. 2 is a side view showing a cross section of a first melting cylinder according to the first embodiment of the present invention.
- FIG. 3 is a side view showing a cross section of a second melting cylinder according to a second embodiment of the present invention.
- FIG. 4 is a side sectional view showing a base of the second melting cylinder of FIG. 3 in an enlarged manner.
- FIG. 5 is an enlarged sectional view showing the structure of the opening / closing device provided in the pouring member of the present invention.
- FIG. 1 is a side view showing a cross section of the entire configuration of an injection device of a cold chamber die casting molding machine according to the present invention.
- FIG. 2 is a side view showing a cross section of a first melting cylinder according to the first embodiment of the present invention.
- FIG. 3 is a side view showing a cross section of a
- FIG. 6 is a cross-sectional view of the billet supply device of the injection device of the cold chamber die casting molding machine according to the present invention, and is a cross-sectional view taken along the line XX of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the light metal material supplied to the injection device will be described.
- the light metal material is formed in advance into a short rod-like shape obtained by cutting a cylindrical rod into predetermined dimensions.
- Light metal materials of this shape are referred to below as billets.
- Reference numeral 2 denotes the billet whose outer periphery and cut surface are finished smoothly.
- the outside diameter of the billet 2 is determined when the billet 2 is heated by the melting cylinder 11 described later and slightly expanded. Is also formed to be smaller than the inner diameter of the base end side (right side in the figure) of the cylinder hole 11a of the melting cylinder 11 by 0.2 mm to 0.5 mm.
- the length of the billet 2 is formed to a length corresponding to the injection volume of 10 shots or 10 shots of the injection molding, and is, for example, 30 Omm or 40 Omm for easy handling. O mm is formed. Since the light metal material is supplied in the form of such a billet, it is easy to handle such as storage and transportation. In particular, when the billet is a magnesium alloy material, there is an advantage that the material is less oxidized than the chip-shaped material used in the thixomolding method since the billet has a small surface area with respect to the volume of the billet.
- the injection volume for one shot is the volume of the molten metal injected in one shot, and allows for the volume of the molded product, the volume of sprues and runners that accompany it, and the volume that will shrink. Volume.
- the injection device 1 includes a melting device 10, a plunger injection device 20, and a pouring member 15 for pouring molten metal from the melting device 10 to the plunger ejection device 20. Including.
- the melting device 10 is different from the injection device of the conventional cold chamber die casting machine in that the light metal material is supplied as the billet 2 described above.
- the melting device 10 includes a melting cylinder 11, a billet supply device 40, and a billet insertion device 50, and the melting cylinder 11 and the billet insertion device 50 are fixed to a center frame member 90.
- the center frame member 90 is a member that accommodates the billet supply device 40, and includes four rectangular side plates and one bottom plate. In one of the two opposing side plates 90a, a through hole 90b slightly larger than the outer diameter of the billet 2 is formed, and in the other, a through hole 9 through which a pusher 52a described later advances and retreats. 0 c is formed You.
- the melting cylinder 11 is a long cylinder that accommodates a plurality of billets 2 sequentially inserted from the base end thereof, and most of the cylinder hole 11 a except for the base end will be described later. As shown in FIG. The end of the cylinder hole 11a is closed by an end plug 13 and communicates with a pouring hole 15a of a pouring member 15 described later.
- the melting device 10 composed of the melting cylinder 11, the billet supply device 40, and the billet introduction device 50 is supplied one by one behind the melting cylinder 11 by the billet supply device 40.
- the Biretsuto 2 that is inserted into the O connexion melting cylinders 1 1 to the pusher 5 2 a of Biretsuto insertion device 5 0, melts earlier from its distal end side.
- the molten molten metal 3 is adjusted so that the molten metal 3 always has an amount of several shots.
- the melting cylinder 11, the pouring member 15, the billet supply device 40 and the billet insertion device 50 will be described in further detail later.
- the plunger injection device 20 is basically the same as the injection device of a conventional cold chamber die casting molding machine, and includes an injection sleeve 21, a plunger 22, and a plunger drive device 60.
- the injection sleeve 21 and the plunger driving device 60 are fixed on one axis via a connecting member 64.
- the injection sleeve 21 has a cylinder hole 21a for temporarily storing the molten metal 3 at the center thereof, and a material supply port 21h into which the molten metal 3 is injected at an upper portion thereof. Then, the tip side (left side in the figure) of the injection sleeve 21 penetrates the fixed platen 31 and the mold 32.
- the plunger 22 is connected at its base end to the piston rod 62 of the plunger driving device 60 and is controlled to move back and forth in the injection sleeve 21.
- a plunger injection device 20 fixes a center frame member 90 via a connection base member 92 on a plunger driving device 60 mounted on a moving base 91 on a machine base not shown. You To install the melting device 10. Then, the plunger injection device 20 injects the injected molten metal 3 into the cavities 34 of the molds 32, 33 by the plunger 22.
- the injection sleeve 21, the plunger 22, the connecting member 64 and the plunger drive 60 will be described in more detail later.
- the dies 3 2 and 3 3 are conventionally known dies.
- heating heaters 12 a and 1 such as band heaters are used. 2b, 12c and 12d are wound around the melting cylinder 11.
- the heater 18 and the heater 23 are wound around the pouring member 15 and the injection sleeve 21. Is done.
- These heaters have a predetermined temperature set in the vicinity thereof based on the temperature of the feed pack of a temperature sensor (not shown). To control the temperature. For example, the temperatures of the heaters 23 and 18 are set to about 600 ° C.
- the temperature settings of the heaters 12a, 12b, 12c, and 12d will be described later.
- the melting cylinder 11 may be formed of ceramics or the like, and the heating heater may be an induction heating coil.
- FIG. 2 is a side sectional view illustrating the first embodiment.
- FIG. 3 is a side cross-sectional view illustrating the second embodiment, and
- FIG. 4 is a side cross-sectional view showing the base of FIG. 3 in an enlarged manner.
- the melting cylinder is a cylinder for molding a magnesium alloy
- the cylinder is manufactured such that the gap between the large-diameter cylinder hole 11 and the billet 2 is about 1 mm to 2 mm.
- the base end side cylinder hole 11 1 c is manufactured so that the gap is about 0.2 mm to 0.5 mm with respect to the heated billet 2 which has slightly expanded.
- the position of the step 11 d is the diameter of the melting cylinder 111, the volume of the molten metal 3 to be stored, the set temperature of the heaters 12 c and 12 d, or the large-diameter cylinder hole 11 b Depending on the relationship with the gap with respect to the billet 2, it is formed in advance at different positions before and after as appropriate.
- the diameter of the cylinder bore 1 This is the cylinder diameter that indicates one of the injection capabilities of the molding machine.
- reference numeral 211 denotes a second melting cylinder according to the second embodiment.
- the base of the melting cylinder 211 is fixed to the side plate 90a of the central frame member 90 together with a cooling sleeve 212 described later, and is firmly connected with bolts 21-13.
- a cooling path 90 d through which the coolant circulates is formed around the through hole 90 b of the side plate 90 a of the central frame member 90. Therefore, since the side plate 90a also functions as a cooling member, it is also referred to as a cooling member 214 in the following description.
- the cooling member 214 may be configured as a member different from the side plate 90a of the central frame member 90, and may be interposed between the melting cylinder 211 and the side plate 90a.
- the gap between the through hole 90b and the billet 2 is formed so that, for example, when the billet 2 is made of a magnesium alloy, the gap between the slightly expanded billet 2 is about 0.2 mm to 0.5 mm. You. Due to the gap between the through holes 9Ob and the cooling action of the side plates 90a, the billet 2 is inserted into the through holes 90b without interference and the pressure of the molten metal 3 which rises slightly during measurement is increased. Even so, it is maintained in a non-softened state without deformation.
- the cylinder hole 211a of the second melting cylinder 211 is formed several mm larger than the billet 2, for example, when the molding material is a magnesium alloy, the gap with the billet 2 is increased. It is formed large to be about 1 mm to 3 mm. The effect of the clearance will be described later.
- the melting cylinder 211 has an annular convex portion 211 e bulging into a sleeve shape as shown in FIG.
- a space 215 is formed between the melting cylinder 211 and the cooling member 214 when they are connected via the air. Then, a through hole or notch 2 1 1 f Are formed, and the heat trapped in the space 215 is radiated. Therefore, this space 2 15 functions as an adiabatic space between the cooling member 2 14 and the melting cylinder 2 11. .
- the cooling sleeve 2 12 is a small-volume, substantially cylindrical shape that is located between the base end of the melting cylinder 2 11 and the side plate 90 a as the cooling member 2 14 and has a contact area for both as small as possible. Formed on the member. As shown in FIG. 4, the cooling sleeve 211 is fitted between a counterbore at the front end of the cooling member 214 and a counterbore at the base end of the melting cylinder 211. A temperature sensor (not shown) is attached to the cooling sleeve 2 12 to detect the temperature.
- annular groove 211 a for solidifying and holding the molten metal 3 backflowed around the billet 2 is formed in the inner hole of the cooling sleeve 212.
- the annular groove 2 12 a has a groove width of 2 O mm to 40 mm, preferably about 30 mm, and a groove depth dimension of a melting cylinder. It is formed so as to be about 3 mm or 4 mm with respect to the cylinder hole 2 11 a.
- An inner hole 2 12 b of the cooling sleeve 2 12 on the front side of the annular groove 2 1 2 ′ a is formed with an inner diameter equal to the cylinder hole 2 1 1 a, and an inner hole 2 1 2 a on the rear side of the annular groove 2 1 2 a is formed.
- a hole 211c is formed with an inner diameter equal to the hole 90b. Since such an annular groove 2 12 a is formed in the cooling sleeve 2 12 in contact with the cooling member 2 14, it is cooled strongly by the cooling member 2 14. The function and effect of such an annular groove 211a will be described later.
- the annular groove 2 12a is formed so that it is entirely contained in the cooling sleeve 2 12 in FIG.
- cooling sleeve 211 should be as rigid and thermally expandable as the melting cylinder 211 and the cooling member 211, and as good as possible in thermal conductivity. Is preferred.
- the cooling sleeve 211 can be formed integrally with either the melting cylinder 211 or the cooling member 214.
- the cooling sleep 2 12 does not hinder the strength even if it is a cylindrical member having a small volume as shown in the figure, that is, a relatively thin wall. This is because the molten solid 3 does not leak backward from the annular solidified product and the high pressure is not applied since the annular solidified product 201 described later is formed in the annular groove 212a.
- the first and second melting cylinders 1 1 1 and 2 1 1 are wound around the above-mentioned heating heaters 12 a, 12 b, 12 c and 12 d.
- the heaters 12 a, 12 b, and 12 c are set to the melting temperature of the billet 2.
- the temperatures of these heaters are set to about 600 ° C. to about 65 ° C.
- the temperature of the heater 12 d is set to be slightly different between the first melting cylinder 111 and the second melting cylinder 211.
- the set temperature of the heater 12 d of the first melting cylinder 111 is set to 450 ° C. to 550 ° C. in order to suppress the softening of the billet 2 located at the base end of the melting cylinder 111. Adjusted appropriately to about C. This is because the magnesium alloy starts to soften substantially when heated to about 350 ° C. By being heated in this manner, the billet 2 is preheated to such a degree that it does not soften at the base end side of the melting cylinder 111, and is heated to a high temperature in a portion from the middle to the distal end side of the melting cylinder 111.
- the side plate 90a of the center frame member 90 is not usually heated, but may be cooled by providing a cooling pipe in the same manner as the cooling path 90d in the second melting cylinder 211.
- the heater 1 2d of the second melting cylinder 2 1 1 is attached to a position avoiding the vicinity of the base end of the melting cylinder 2 1 1 to which the cooling sleeve 2 1 2 is attached, and the cooling sleeve 2 1 2
- the effect of heating on the temperature is suppressed as much as possible, and the set temperature is adjusted to around 550 ° C to 550 ° C.
- the cooling sleeve 2 12 is suppressed in its heating and is strongly cooled by the cooling member 2 14. Therefore, the temperature of the cooling sleeve 212 is adjusted mainly by the setting of the cooling temperature of the cooling member 214, but is also adjusted by the heater 12d.
- a pipe through which the cooling liquid passes may be wound around the cooling sleeve 2 12 to adjust the temperature individually. More specifically, for example, in forming a magnesium alloy, the billet 2 located in the cooling member 214 is cooled so that the temperature of the billet 2 does not exceed about 100 ° C to about 150 ° C. It is preferable to control the temperature of the billet 2 located in the leave 2 12 so as to be about 400 ° C. which is close to the temperature 350 ° C. at which softening occurs slightly.
- the billet 2 is heated by the first melting cylinder 111 and the second melting cylinder 211, the billet 2 is melted first from its tip side and changes to the molten metal 3.
- the temperature of the molten metal 3 is adjusted so that an injection volume for several shots is ensured even if the amount of the molten metal 3 is increased or decreased every time during the molding operation. In this way, the minimum amount of molten metal is melted and stored in the melting device 10, so that the amount of heated energy is small and efficient. Also, the temperature rise for Si solution and the temperature fall for solidification are short, minimizing the unnecessary waiting time for maintenance work. You. .Of course, the size of the melting equipment is much smaller than the conventional melting furnace.
- one shot of molten metal is supplied from the melting cylinder 1 1 1 or 2 1 1 to the ejection sleeve 21, that is, when the molten metal 3 from the gap between the billet 2 and the molten cylinder 11 1 is measured.
- the back lip must be securely blocked. For this reason, sealing is performed in both the first melting cylinder 11 1 and the second melting cylinder 2 11 1 by the method described below.
- the tip of the softened billet 2 is substantially slightly expanded in diameter. Then, the molten metal 3 is sealed by appropriately contacting the side surface 2a of the enlarged tip with the wall surface of the cylinder hole 111b. The sealing action by the appropriate abutment of the two is realized by forming the gap between the cylinder hole 11 1 b and the billet 2 with appropriate dimensions. In this case, a small increase in pressure of the molten metal 3 at the time of measurement does not cause the diameter of the billet side surface 2a to be so large, which is convenient.
- the small gap between the cylinder hole 1 1 1 c and the billet 2 of the base end rule minimizes the eccentricity of the billet 2 with respect to the cylinder hole 1 1 1 b and minimizes the gap between them. Furthermore, since the portion of the side surface 2a in contact with the cylinder hole 1 1 1b is kept in an appropriately softened state by the heating of the heaters 12a to 12d and the cooling by the cooling member 2 14, The side face 2a of the billet 2 abuts the cylinder hole 1 1 1b as a soft seal with a uniform diameter to prevent leakage of the molten metal 3 to the rear and entry of air and the like into the molten metal. Functions as a seal with low frictional resistance. Therefore, the enlarged side surface 2a in this embodiment is also referred to as an “expanded seal” hereinafter.
- the clearance between the cylinder hole 11 1 b and the billet 2 is as described above.
- the first melting cylinder 1 1 1 above should be sufficient for a small injection molding machine with a relatively small diameter of the melting cylinder 1 1 1 Can be adopted.
- the melting cylinder 111 having a simple configuration composed of the above-described cylinder hole 1lib and 111c meets the demand for cost reduction required for a small injection molding machine.
- the backflow phenomenon of the molten metal which is likely to occur in the melting cylinder of a large injection molding machine, does not significantly occur. This can be easily understood from the fact that the diameter of the billet 2 is large in the melting cylinder of a large injection molding machine, so that the circumferential length of the billet 2 becomes long and the gap between the back holes becomes larger.
- the molten metal 3 is not sealed by the above-described “expanding seal”, but is solidified by the annular groove 21 a of the cooling sleeve 21. This is performed by the cyclic solidified material. This cyclic solids seal is described in more detail below.
- the billet 2 in the cooling sleeve 2 12 is temperature-controlled to about 400 ° C near its softening temperature, and is strongly cooled on its outer periphery by the cooling sleeve 2 1 2 .
- the billet 2 advances at a low speed as described later, and at this time, the molten metal 3 already melted at the tip side of the melting cylinder 2 11
- the backflow around the billet 2 fills the annular groove 2 12 a and turns into solidified material.
- This solid has the characteristics described below as cyclic solid 201.
- the annular solidified product 201 is a product in which the molten metal 3 is solidified following the space between the annular groove 211a and the billet 2, so that, for example, the billet 2 and the melting cylinder 21 Even if there is a slight eccentricity with 1, the gap around billet 2 is filled without gap.
- the annular solidified material 201 since most of the annular solidified material 201 is fitted in the annular groove 211a in a solidified state, the annular solidified material 201 may move or break with the billet 2 during measurement. No growth occurs on the proximal side of the annular groove 2a.
- the billet of the annular solidified material 201 is formed.
- the surface in contact with 2 is maintained in an appropriately softened state.
- the bonding force or adhesive force of the annular solidified material 201 to the billet 2 is not so strong because the high-temperature molten metal 3 is rapidly solidified to the billet 2 at a relatively low temperature.
- the inner diameter of the cylinder hole 2 11 1a of the melting cylinder 2 11 1 is set so that the tip of the softened billet 2 will not come into contact with the cylinder hole 2 A gap with the outer diameter of 2 is formed to about several mm.
- the molten metal 3 wraps around the enlarged billet tip without being blocked, and the molten metal 3 is pushed out by the billet 2 while avoiding the space where the molten metal does not flow around.
- the annular solidified material 201 seals the gap between the billet 2 and the melting cylinder 211 in a favorable and stable manner when the billet 2 advances and pushes the molten metal 3 in the subsequent measurement. .
- the cyclic solidified material 201 Not to let air or the like intrude from between the cut 2 and the melting cylinder 2 11, not to leak the molten metal 3 to the rear, and to reduce frictional resistance when the billet 2 moves.
- the sealing effect of the annular solid 201 is such that the light metal material, especially the magnesium alloy, rapidly changes from a solid to a liquid due to its large size, low thermal conductivity and small heat capacity / latent heat. Has been used successfully.
- annular solidified material 201 described above reliably seals the molten metal 3 as an “annular solidified material seal”.
- a melting cylinder 211 can be used not only in a small injection molding machine but also in a large injection molding machine having a larger diameter of the billet 2.
- the melting cylinder 11 includes both the first melting cylinder 11 1 and the second melting cylinder 2 11 unless otherwise specified.
- the communication passage 13b is formed between the portion of the upper surface of the plug portion of the end plug 13 cut off and the cylinder hole 11a so as to open above the cylinder hole 11a of the melting cylinder 11. Is formed as a space.
- the cutting is, for example, cutting horizontally into a D-shaped cross section or cutting like a keyway.
- the melting device 10 including the melting cylinder 11 is arranged in an inclined posture of about 3 degrees with its tip end positioned higher.
- the position of the communication passage 13 b and the inclination of the melting cylinder 11 prevent the molten metal 3 melted in the melting cylinder 11 1 from flowing out to the injection sleeve 21 at unscheduled times except when measuring.
- the weighing will be accurate. In this case, it is more preferable that not only the melting cylinder 11 but also the entire injection molding machine including the injection sleeve 21 and the mold clamping device 30 be disposed at a lower position in the rear.
- the pouring member 15 includes an opening / closing device 70 as shown in FIG.
- FIG. 5 is an enlarged cross-sectional view showing the configuration around the pouring member 15.
- the opening / closing device 70 includes a valve seat portion 15 b formed immediately near the lower end of the pouring hole 15 a of the pouring member 15 and a pouring hole 1 5a includes a valve stem 71 that opens and closes a, and a valve stem driving device 72 such as a fluid cylinder that drives the valve stem 71 forward and backward.
- a gap serving as a flow path of the molten metal 3 is secured between the valve stem 71 and the pouring hole 15a.
- the opening / closing device 70 having such a configuration will open the pouring hole 15a only when weighing, so that the molten metal 3 that may adhere to the side surface of the pouring hole 15a will be excluded during weighing. Prevent falling when not in time.
- the pouring hole 15a is opened and closed immediately near its lower end, there is almost no side surface of the pouring hole 15a where the molten metal 3 can drop. In this way, the switching device 70 achieves accurate weighing.
- the gas injection hole 17 is mounted on the cover 16 so that the valve rod 71 in the pouring hole 15a is not cooled.
- the measurement may be performed in a state where the molten metal is always filled between the valve rod 71 and the pouring hole 15a.
- the start timing and the end timing of the operation of pushing out the molten metal 3 of the billet 2 coincide with the timing of the opening / closing operation of the pouring hole 15a of the opening / closing device 70 that determines the start and end of the weighing operation. Is controlled as follows. With such weighing, weighing is more precisely controlled.
- the filling of the pouring hole 15a with the molten metal eliminates any drop in the temperature of the pouring hole 15a and the valve stem 71, and prevents the molten metal from adhering to those side surfaces. is there. In addition, there is an effect that the melting efficiency of the molten metal 3 in the melting cylinder 11 is improved.
- the molten metal 3 in the melting cylinder 11 that is in contact with the communication passage 13b is in contact with the inert gas, and a slight temperature drop can be avoided.
- the billet 2 in the melting cylinder 11 can be pre-pressed, which facilitates melting.
- FIG. 6 is a cross-sectional view of the center frame member 90 of FIG. 1 taken along the line XX, and is a cross-sectional view of the billet supply device.
- This device includes, for example, a hopper 41 in which a large number of billets 2 are loaded in an aligned state, a shot 42 for sequentially dropping the billets 2 in an aligned state, and a shirting device 4 for receiving the billets 2 and dropping them one by one. 3 and a holding device 44 for holding the billet 2 concentrically around the axis of the melting cylinder 11.
- a partition 41 a is provided so that the billet 2 falls without a delay.
- a shutter plate 43a and a holding member 45 that opens and closes the holding device 44 constitute a two-stage upper and lower shutter, and the shutter plate 43a and the holding member 45 alternate.
- the billet 2 is dropped one by one by opening and closing operation.
- 4 3 b is an air syringe that moves the shirt plate 4 3 a It is a fluid cylinder such as a damper.
- the holding device 4 4 is a set of holding members 45, 46 holding the billet 2 with a slight gap left and right from the left and right, and a fluid cylinder such as an air cylinder opening and closing one holding member 45. 47, and a guide member 48 that receives the billet 2 on its guide curved surface below the shutter 42 and guides it to the holding member 46 side.
- substantially semicircular concave portions 45a, 46a having a diameter slightly larger than the outer diameter of the billet 2 are formed.
- the centers of the recesses 45a and 46a substantially coincide with the centers of the cylinder holes 11a.
- the billet 2 supplied from the hopper 41 is held by the holding device 44 so as to substantially coincide with the center of the cylinder hole 11a.
- Such a billet supply device 40 holds the billets 2 in an aligned state and drops the billets 2 one by one. Therefore, the device that functions as described above is not limited to the device of the above embodiment. In some cases, the billet 2 is preheated at a low temperature outside the machine in order to dehumidify the surface. .
- this device includes a hydraulic cylinder 51, a piston rod 52 that is controlled to move back and forth by the hydraulic cylinder 51, and a pusher 52 integrally formed at the tip of the piston rod. and a.
- the maximum movement stroke of the pusher 52 a is set to a length slightly exceeding the entire length of the billet 2.
- the pusher 52a moves forward one shot at a time during weighing.
- the position and speed of the pusher 52a are detected by a position detecting device such as a linear scale (not shown), and are fed back and controlled by a control device (not shown).
- the billet insertion device 50 described above uses the pusher 52 a when refilling the billet 2. Retract by a distance equal to or greater than the entire length of billet 2, to secure the space where billet 2 is supplied. Then, the pusher 52 a is advanced to insert the billet 2 into the melting cylinder 11. In addition, the billet insertion device 50 sequentially advances the pusher 52 a at the time of weighing, and feeds the molten metal 3 corresponding to the injection volume of one shot into the injection sleeve 21 by one advance.
- Such a billet insertion device 50 is not limited to a hydraulic cylinder drive device as long as it is a device capable of operating the pusher 52a as described above. It may be an electric drive device that moves the pusher 52a by changing to a linear motion through a stitch or the like.
- the connecting member 64 connecting the injection sleep 21 and the plunger driving device 60 is a cylindrical member, and has a through hole that fits with the plunger 22 at a position close to the front thereof with almost no gap.
- a partition 64 a is provided.
- a collecting pan 65 is detachably provided below the connecting member 64 in front of the partition wall 64 a in preparation for leakage of the molten metal 3, and an inert gas is injected above the same connecting member 64.
- Injection holes 64b are provided.
- the connecting member 64 having such a configuration forms a space 66 between the base end of the injection sleeve 21 and the partition wall 64a.
- the molten metal is recovered by the recovery pan 65.
- inert gas is injected into this space 66.
- the air existing in the gap between the plunger 22 and the cylinder hole 21a on the proximal end side is purged. This purge creates a favorable environment for oxidation protection of the material, especially in the case of magnesium molding.
- the amount of the inert gas to be supplied is small since it is supplied only to the space 66 and the small gap between the injection sleeve 21 and the plunger 22.
- this device includes a hydraulic cylinder 61, a piston rod 62 that is controlled to move back and forth by the hydraulic cylinder 61, and a coupling 63 that connects the piston rod 62 and the plunger 22.
- the plunger 22 is inserted from the base end side of the injection sleeve 21, and is driven back and forth by the piston rod 62 of the hydraulic cylinder 61.
- the position of the plunger 22 is detected by a position detecting device such as a linear scale (not shown), and is fed-packed to a control device (not shown) to control the position.
- the retreatable position of the plunger 22 is set at a position closer to the base end than the material supply port 21 h, and the maximum stroke is designed in advance according to the maximum injection volume of the ejection device 1.
- a plunger drive device 60 is not limited to a hydraulic cylinder drive drive device, but is an electric drive device that moves the plunger 22 by changing the rotational motion of a servo motor into a linear motion via a ball screw or the like. May be.
- the plunger 22 has a head portion 22a slightly smaller in diameter than the inner diameter of the injection sleeve 21 and a shaft portion 22b slightly smaller in diameter than its head portion 22a.
- a plunger driving device 60 having a biston ring whose head portion 22 a is not shown in the figure is provided on the outer periphery thereof provides the plunger 22 at the time of weighing. After the metering, the plunger 22 is advanced to control the injection speed and injection volume of the molten metal 3 and, if necessary, the holding pressure.
- the molding operation is performed as follows by the injection device 1 of the present invention configured as described above. For ease of understanding, the actual injection molding operation will be described first.
- the weighing operation starts first. First, after the plunger 22 has retracted backward from the material supply port 21h, the pusher 52a advances the billet 2 by a predetermined amount. When the opening / closing device 70 is provided, the opening operation of the valve stem 71 is performed simultaneously. By this measuring operation, the molten metal 3 for one shot in the melting cylinder is supplied from the pouring member 15 to the injection sleeve 21. This operation is usually performed after the molded product formed in the previous molding cycle is taken out and clamped.
- the pressure of the molten metal 3 does not increase. Therefore, the seal of the molten metal 3 is surely performed by the above-mentioned “expansion seal” or “annular solidified seal”. In particular, even when the molten metal 3 is always filled in the pouring hole 15a by the opening and closing device 70, the opening operation of the valve rod 71 is performed simultaneously, so that the pressure of the molten metal does not become particularly high.
- the molten metal 3 measured in the injection sleep 21 is maintained in a molten state by the heater 23. At this time, the inert gas prevents oxidation of the molten metal.
- the plunger 22 advances as before, and one shot of molten metal is injected into the cavity 34.
- the conventionally known molded article is cooled, the mold is opened, and the molded article is taken out.
- the mold is closed and the above measurement is performed again. .
- the molten metal 3 in the melting cylinder 11 consumed at each measurement is melted and filled before the next measurement is started.
- billet 2 moves forward one by one.
- billet 2 is replenished.
- the replenishment operation starts when the position detector of the pusher 52a detects that the pusher 52a has moved forward beyond the distance of one bite.
- the billet insertion device 50 retracts the pusher 52 a by a distance equal to or more than the entire length of the billet 2 to secure a space for supplying the billet 2 behind the melting cylinder 11.
- the bill supply device 40 supplies one bill 2 to the back of the melting cylinder 11, and the bill insertion device 50 pushes the bill 2 into the melting cylinder 11 to perform a replenishing operation. Complete.
- the injection device of the cold chamber die casting molding machine of the present invention enables the molding material to be supplied in the form of a billet while employing the conventional plunger injection device as it is. Therefore, the injection apparatus of the present invention eliminates the need for a melting furnace in the melting apparatus while maintaining the injection characteristics of the cold chamber die-casting molding machine as it is, thereby facilitating material handling and efficiently melting the molding material. And weighing. In addition, the injection device of the present invention simplifies the injection device to facilitate its handling and also facilitates its maintenance work.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/535,478 US7137435B2 (en) | 2002-11-18 | 2003-11-17 | Enhanced cold chamber die casting molding machine |
DE10393767T DE10393767T5 (de) | 2002-11-18 | 2003-11-17 | Spritzgießeinheit in einer Kaltkammer-Druckgussmaschine und darin angewandtes Dosierverfahren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-333077 | 2002-11-18 | ||
JP2002333077A JP4272413B2 (ja) | 2002-11-18 | 2002-11-18 | コールドチャンバダイカスト成形機の射出装置及びその計量方法 |
Publications (1)
Publication Number | Publication Date |
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WO2004045791A1 true WO2004045791A1 (ja) | 2004-06-03 |
Family
ID=32321682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/014690 WO2004045791A1 (ja) | 2002-11-18 | 2003-11-17 | コールドチャンバダイカスト成形機の射出装置及びその計量方法 |
Country Status (5)
Country | Link |
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US (1) | US7137435B2 (ja) |
JP (1) | JP4272413B2 (ja) |
CN (1) | CN1325200C (ja) |
DE (1) | DE10393767T5 (ja) |
WO (1) | WO2004045791A1 (ja) |
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CN105081269A (zh) * | 2015-09-21 | 2015-11-25 | 昆山子申机电设备有限公司 | 镁合金半固态射出成型机构 |
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JP2007038235A (ja) * | 2005-08-01 | 2007-02-15 | Toyo Mach & Metal Co Ltd | 溶融金属成形装置 |
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CN100355519C (zh) * | 2006-07-07 | 2007-12-19 | 瑞玛泰(北京)科技有限公司 | 镁合金液态金属控制装置 |
JP4210298B2 (ja) * | 2006-12-18 | 2009-01-14 | 日精樹脂工業株式会社 | 金属成形機の材料溶解保持装置における棒状材料溶解方法 |
JP2008188627A (ja) * | 2007-02-05 | 2008-08-21 | Toyo Mach & Metal Co Ltd | ダイカストマシンの制御方法 |
JP2008254045A (ja) * | 2007-04-06 | 2008-10-23 | Toyo Mach & Metal Co Ltd | 溶融金属成形装置 |
JP2008296274A (ja) * | 2007-06-04 | 2008-12-11 | Toyo Mach & Metal Co Ltd | 溶融金属成形装置 |
DE102007058254A1 (de) * | 2007-11-26 | 2009-05-28 | Klein, Friedrich, Prof. Dr. Dr. h.c. | Gießkolbenstange für eine Gießmaschine |
JP4666317B2 (ja) * | 2008-01-16 | 2011-04-06 | 日精樹脂工業株式会社 | 金属成形用射出装置の棒状材料溶解保持装置 |
JP4679614B2 (ja) * | 2008-08-05 | 2011-04-27 | 美和ロック株式会社 | ダイカストマシン |
US20120111523A1 (en) * | 2010-11-05 | 2012-05-10 | Bochiechio Mario P | Melting unit for a die casting system |
JP5768616B2 (ja) | 2011-09-20 | 2015-08-26 | トヨタ自動車株式会社 | ダイカスト装置 |
WO2013048429A1 (en) * | 2011-09-30 | 2013-04-04 | Crucible Intellectual Property Llc | Injection molding of amorphous alloy using an injection molding system |
US20130340967A1 (en) * | 2012-06-26 | 2013-12-26 | GM Global Technology Operations LLC | Advanced Feed System for Semi Solid Casting |
US8813816B2 (en) * | 2012-09-27 | 2014-08-26 | Apple Inc. | Methods of melting and introducing amorphous alloy feedstock for casting or processing |
US8813814B2 (en) * | 2012-09-28 | 2014-08-26 | Apple Inc. | Optimized multi-stage inductive melting of amorphous alloys |
JP6157408B2 (ja) * | 2014-05-22 | 2017-07-05 | 三菱電機株式会社 | 溶融金属吐出装置および溶融金属吐出方法 |
US10252307B2 (en) * | 2015-05-15 | 2019-04-09 | Nittan Valve Co., Ltd. | Highly-viscous substance dispensing method and highly-viscous substance dispensing apparatus |
JP6579617B2 (ja) * | 2015-09-11 | 2019-09-25 | 株式会社ソディック | 軽金属射出成形機の射出装置 |
SE539619C2 (en) * | 2016-02-03 | 2017-10-17 | Core Link Ab | Method and apparatus for trimming cores |
JP6300882B1 (ja) * | 2016-10-27 | 2018-03-28 | 株式会社ソディック | 溶融装置 |
JP6335243B2 (ja) * | 2016-10-27 | 2018-05-30 | 株式会社ソディック | 射出成形機 |
JP6308695B1 (ja) * | 2016-12-07 | 2018-04-11 | 株式会社ソディック | 射出成形機 |
JP6544875B1 (ja) * | 2018-06-07 | 2019-07-17 | 株式会社ソディック | 軽金属射出成形機の射出装置 |
JP6590425B1 (ja) * | 2018-10-05 | 2019-10-16 | 株式会社ソディック | 軽金属射出成形機の射出装置およびその射出制御方法 |
CN113579196A (zh) * | 2021-07-15 | 2021-11-02 | 伯乐智能装备有限公司 | 一种轻合金改性产品的制造方法 |
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Also Published As
Publication number | Publication date |
---|---|
US7137435B2 (en) | 2006-11-21 |
CN1711145A (zh) | 2005-12-21 |
DE10393767T5 (de) | 2005-10-27 |
JP4272413B2 (ja) | 2009-06-03 |
US20060042772A1 (en) | 2006-03-02 |
CN1325200C (zh) | 2007-07-11 |
JP2004167499A (ja) | 2004-06-17 |
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