JPH04500335A - electromagnetic pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] electromagnetic pump The present invention is an electromagnetic pump, more particularly useful for low pressure permanent mold casting of molten metal. Regarding electromagnetic pumps. This electromagnetic pump uses molten magnesium, for example, Useful for casting metals such as ium alloys and magnesium composites. used for profit.

Electromagnetic pumps are used, for example, in aluminum and magnesium processing processes and in nuclear power applications. It is known to be used in industry to pump reactor cooling fluids. Conventional None of the technology's electromagnetic pumps have been successfully used in low-pressure permanent molding processes. do not have. Prior art electromagnetic pumps also have the disadvantage of requiring external cooling. Ru.

The electromagnetic pump was developed by Behren on December 16, 1987. =Annular Linear [nduct, io n Pump With An Ext, ernally 5upporterJ Duct,” which is described in US Pat. No. 4,828,459 It will be done. The electromagnetic pump of the present invention is described in U.S. Pat. No. 4,828,459. This is a pump that is much more improved than a pump.

(1) Capable of operating without auxiliary cooling at molten magnesia temperatures; (2) Capable of supplying low pressure permanent mold die casting machines; (3) Wide range of casting machines; (4) Flexibility in design dimensions for machines, and (4) ability to utilize various mold shapes. Wide range of control for maximum versatility, and (5) introduction into molds. An electric heating type that keeps the metal heated at the idling position directly below the point. It would be desirable to provide an electromagnetic pump that incorporates a stand vibrator.

The present invention provides a first set of mold filling sump coils and a mold filling sump coil. a housing containing a second set of coils; Each of the above coils is connected separately and independently to the power supply and control system. a second set of electromagnetic pumps adapted to hold the molten metal at a predetermined level; oriented toward the group.

FIG. 1 shows an embodiment of the apparatus of the invention for casting billets or ingots. FIG.

FIG. 2 is a front view of the billeting apparatus of the present invention for use in the method of the present invention; .

Figure 3 is a partial sectional view of the billet machine in Figure 2. FIG.

FIG. 51 is a side view showing an embodiment of an electromagnetic pump for use in the method of the present invention; be.

6 is a partial front view of the electromagnetic pump of FIG. 5. FIG.

Fig. 7 is a partial sectional view of the electromagnetic pump shown in Figs. It is a two-sided view.

9 is a cross-sectional view taken along the line 10-40 in FIG. It is a sectional view taken along the line 0-10.

The present invention provides a molten metal 51 alloy and 7. / or composite material stopper containing molten material Producing low-pressure permanent mold castings from: Apparatus and method. Used in this invention The pressure applied is 2 to 30 (13,8 to 207 kPa>te).

One-stage molding machine, a machine that can manufacture straw molded products or molded bodies at once. Manufacture finished castings using machines. Complete products manufactured by the method and apparatus of the present invention 7. Cast products, e.g. billets, should be treated ``as is'' as soon as they are removed from the machine. Yes, it can be shipped. This product is useful in e.g. remelting or extrusion processes . The method and apparatus of the invention can be used, for example, to completely clear glazes with fine isoglaze particles. provide a let.

The present invention (as an example of a billet produced in a double-sided manner) has a billet with a density higher than 95%. are manufactured. Billets with a porosity of less than 4% are preferred. B1]・The throat is , it should contain a minimum amount of large non-metallic contaminants, if at all. straight Contains non-metallic contaminants with dimensions greater than 0.020 inch (0.51 nun) Billets with a quantity of zero per square inch (6.45 cd) could be produced.

The total number of non-metallic contaminants in the specimen can be determined using standard methods such as optical microscopy of the fracture surface. The 1 and 1 knots measured from this are finely divided through the structure of the 2 and l- It is preferred to contain equiaxed grains of about 0.10 inches or more in diameter. ” fin The cut is considered a good quality billet, X=.

Various well-known mold shapes, such as Bi! , / 71・, Wheel, In-Ryoso 1~, T 7 rods and other similar items can be used in the present invention. In the present invention, sand molds are also used. You can use it more.

The yield of machining in 4-42 depends on the number of cast members desired. Obviously, f4 is as efficient as possible.゛-ri;: ri-kani-casting products, -manufacturing It is requested that In general, for cast products, 1 minute force; v +: 210 minutes from i pieces The production rate is up to 1 piece per 0 minutes, preferably at a rate of at least 1 piece per 10 minutes. The advantages of the method and apparatus of the present invention are that the magnetic screw head l. Casting of molten metals such as cunnium alloy and/or magnesium composite material (Part 2) The goal is to provide a means to do so.

Any magnesium or magnesium base metal can be used in the present invention. . For example, varying amounts of Al-ZIl.

Mn, cloth metal, Zr, A3-Y, 1. ’ h and other similar items. You can use what you have. AZ9L, to/.

; U1. E, 7.33-Z K2O, 5 magnets like AM60 jl Base metal, American Society for Testing and Materials (ASTM) B 80-1987, page 34), - The other alloys listed are useful for treatment according to the invention. . All commercial and experimental alloys are useful in this invention.

An example of a magnesium composite material is reinforced with 20% by volume of 600 grit l”Sic granules. AZ91-20% by volume of 1000 grit) SiC reinforced An alloy of magnesium and 6% by weight zinc, 1-30% by weight, particle size 1-50# SiC, Aj? 203 or B4 (: All commercial and experimental machines enhanced with Gnesium alloys should be included.

The cooling means used in the present invention may be e.g. air, 112 0, glycols and the like. The melted material is , before removing the product from the machine, at a temperature substantially lower than the solidification temperature of its molten material. Cool until 11. , 1 also t゛) Various 7 (ra, used < ; U solid temperature and The cooling temperature depends on the molten material used (2, 2, 5-7 g/r, l) The solid temperature is 650'l'. For example, magnesium castings are tl, f i'9-! ↑ru1'ri1 go (, ko, main 1. The cast product is removed from the mold by 2 () Cooled to a temperature of 0.400°C.

The solidification step 101 in i) of the present invention is used for determining the size of the cast product, designing the mold, and casting. It is significantly influenced by the type of metal being used.

Generally, the solidification time of m9 products is 1.j, 2 to 44 minutes.

The constituent materials of the device of the present invention are 4-, 4-, 4-g materials, etc., used for the 6th and 6th parts of industrial machinery, e.g. Is it mild steel? , stainless steel, or C, 4140 J-7':4)'J ：High carbon High carbon High I＞　、、　−q☆１３、The material should be reactive with the molten substance− Without C, ■1 place, 11 conditions C should be stable82 For example, a molded part is It may be exposed to thermal shock, so it should not be made of hard steel.

[Sprue] refers to the entrance to the mold cavity. In low pressure permanent mold In casting, the metal can solidify within the confines of the sprue that is poured into the mold. do not have. To minimize hardening on the sprue, heat the sprue (ii 1. The sprue may be heated by any conventional means. Within the range of sprue Preventing billet hardening helps increase billet production. for example, Once the solidification within the sprue has stopped, one billet is removed every 3-10 minutes. It is possible to produce 1.0 bits per liter at a speed of 1.

With particular reference to FIG. 1, this includes molten metal to billet and A casting apparatus, generally designated by the reference number ] 0, is shown for producing a cast iron. It is. The casting apparatus 10 is a billet forming machine generally designated by the reference numeral 11. forming machine, an electromagnetic pump generally designated by the reference numeral 12, and a melting material 14 therein. It includes a crucible 13 containing a.

The billet forming machines 11, shown more clearly in FIGS. 2-4, are brought into contact with each other. and two molds that are mirror-opposed to form a mold cavity 23. Includes portions 21 and 22. The upper, middle and lower parts of each of these mold parts A thermocouple is placed to monitor the temperature of the mold section. The thermocouple on the top is preferred. or directly with molten metal to indicate whether the mold is full of molten metal. It is arranged to extend through mold portion 22 in contact with it. The mold can slide mounted on the sliding member so as to be able to function. The sliding member itself slides over the mold area. so that the mold part can be opened or closed and placed on the mold part. and is mounted on the support bottom plate 25. The mold is used to open or close the mold part. is connected by a support structure 26 to actuating means 27, such as a hydraulic jack. Ru.

A coolant inlet 28 at the top of the mold directs the coolant through conduit 28b to the top of the mold. The cooling medium outlet 29 at the bottom of the mold is used to introduce the cooling medium from the mold. For example, it is used to release a cooling medium such as air. The cooling medium is supplied to the mold part 21 and 22 and circulates through the cooling medium flow path 28a.

A cooling medium for cooling the molten metal in the cavity 23 from the top to the bottom. may include, for example, air, coolant such as glycol, and the like. Can be done. Sprue 30 is also belayed by introducing a cooling medium, such as air, into the sprue. y) A cooling medium inlet (not shown) to cool the metal at the inlet 33 at the bottom of the molding machine. ) can be included.

The electromagnetic pump 12 is shown more clearly in Figures 5-10, and this electromagnetic pump jλ is a contained, insulated and heated structure that delivers and holds the molten metal. Includes tubes. This pump is used to supply molten metal to the mold 11 and to the casting operation. used to keep a mold filled with molten metal during production.

More specifically, the electromagnetic pump 1z is an electric pump with a regulated plug socket. air box 40. Conduits 41 and 42 connect the electrical box 40 to the pump windings. Connect to. Within the housing 43 is a section generally designated as section A of the pump 12. 12 coils 240 VAC core assembly and common as part B of pump 12 6 coils 110 VAC assembly directed to and straight of the mold entry point There is a heated stand vibrator 44 below which holds the molten metal.

Lifting lugs 45 should lift the pump and be retained by flanges 46 Used for placement onto a supporting platform. Hanger bracket 47 can also be used to support the pump 12 in a position above the crucible 13. Ru. The conduit inlet 48 is for heating the stand vibrator 44 shown in FIGS. 7 and 9. It is used to connect to a heating element 49 for heating. stand vibe 44 An insulating layer 50 of any conventional insulating material is placed around the . Pump electrical system To prevent the system and core system from oxidizing and/or deteriorating at high operating temperatures, An inert gas may be introduced into the box 40 through the inlet 51.

Figure 1 shows a coil 52 around a tube 55 and a housing surrounding a core 53. 43 is shown. Core rod 55 is located in the center of tube 54 and carries molten metal. A ring portion 56 is formed therethrough for suction to the stand vibe 44.

When carrying out one aspect of the present invention, low-pressure casting of a round billet (cylindrical object) using a single billet I forming machine substantially as shown in FIG. 1, as described below. will be implemented.

i.e., preheat the mold and all utensils to a temperature above approximately 100°C before use. . A melting furnace pan is used and is suitable for use with melting magnets/rams. It can be protected by a fluxing agent or SF gas.

12 coils substantially as shown in Figures 5-10, operating on a 240V power supply. An electromagnetic pump is preferably used to supply molten magnesium to the mold.

The electromagnetic pump is attached to the bottom of the billet forming machine by means of a Allows molten metal to fill the mold. Place it on top of the Bamba bomb that has a hole in the center. It will be done. Turn on the pump and check the filling rate and complete filling of the mold. Note visual inspection of flow rate and volume. Periodically inspect all moving parts to ensure accurate response. I guarantee the answer.

The pan is set at a temperature of approximately 690°C. Perform a pan test to ensure that all electrical components are in Make sure it works as required. The billet mold is preheated and This means that SFs, argon, CO2, and similar substances should be removed before placing them on top of the pump. It can be purged with a gas such as The mold isolates the walls of the mold from the molten metal. To prevent the molten metal from wetting the walls of the mold, use a material such as spinel. Coated with any compatible mold coating. Mold release agent such as graphite spray The coating is also preferably applied to the walls of the mold at about 400°C.

Once the pump and mold are ready for operation, perform the predetermined steps from the pan test. Apply the determined pump feed rate to the mold.

If the thermocouple reading on the top of the mold does not indicate that the mold is full, remove the reading. Apply more power to the electromagnetic pump until the water indicates that the mold is full. Ru.

For the first few mold fills, apply only enough pressure to fill the mold. use After inspecting the finished billet, it was decided to apply additional pressure. Good too.

The mold is completely empty or only a certain amount of metal can be introduced into the mold. If it is determined that the The voltage remains applied. Then turn off the power to the pump and then For example, the mold is cooled at a point for a period determined from a previously prepared temperature diagram. Let it be.

The air flow rate and/or water flow rate for cooling the molten metal used in the present invention is , should be sufficient to cover the necessary cooling of the casting. These flow rates are and they can be controlled within the desired range depending on the desired cooling rate. Can be done. Typically, for example, the water flow rate is 0.5 to cover the required cooling. ~3 gallons/minute (1,89-11.4 liters/minute).

When opening the mold, make sure that there is no molten metal still in the mold. care must be taken to The billet is inspected for quality. Next note When entering, the data from the previous billet is taken in as the operating parameter.

The machine substantially shown in FIG. 1 is a single billet forming machine with a vertical mold A low-pressure dazzler in that molten metal fills the mold through a fill hole located in the bottom center of the It is very similar to the Ikast machine. Magnesium metal fills the mold at approximately 700℃ and e.g. It is cooled using air injected through it.

Example 1 Magnesium composite alloy A23 was prepared using an apparatus substantially as shown in FIG. A billet of 1B was prepared.

An A231B ingot was melted in a 1500 bond (675 kg) steel crucible. melted. The mold cavity is 7.25 inches (18.4 cm) in diameter and long. of steel substantially as shown in Figures 2 to 4, measuring 25 inches (marked 63,5). A billet mold was placed directly above the crucible. Next, the molten composite material is It was supplied to a steel billet mold using an electromagnetic pump. Each weighs 70 pounds ( 6 billets weighing 31.5 kg) were produced at a rate of approximately 1 billet every 9 minutes. .

High quality billets were produced. In other words, these billets contain a small amount of oxide. The amount of voids was reduced, and the surface finish was smooth. Billet The grate is made to a predetermined shape and size without the need for a riser.

Six composite billets cast in low-pressure permanent molds were examined using X-rays, and the results It was shown that the internal porosity of the billet was minimal. these billets Some of them are extruded and have excellent surface quality and are non-porous. , and the particle size is very fine (i.e. 8-10p). It was made into a round bar of 7mr++).

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Claims (4)

[Claims] 1. a first set of coils for filling the mold; and a set of coils for filling the mold. a housing containing a second set of coils; a second set of coils, each connected separately and independently to the power supply and control system; An electromagnetic pump adapted to hold molten metal at a predetermined level. 2. To hold metal at a predetermined level directly below the injection point into the mold 2. A pump according to claim 1, including an electrically heated standpipe. 3. The molten metal is magnesium, an alloy of magnesium, or a composite of magnesium. A pump according to claim 1 or 2, selected from materials. 4. Low-pressure permanent molten metal with separate control of idle setting and mold filling adapted for use in mold casting, said first set of coils having 12 coils; an electromagnetic pump, and the second set of coils has an adjacent set of six coils. A pump with 12 coils, which has its own power source and fills the mold. The 6-coil pump is operated by a control system for Casting heated molten metal in an idling position in an electrically heated standpipe controlled by a control system to maintain the level below the point of injection into the , the pump according to claim 1.2 or 3.