JPS5966968A - Method and device for melting and casting metal - 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 This invention relates to a method and apparatus for melting and casting metals, including alloys.

The conventional casting method is as follows.

(1) Melt the metal in a melting furnace (crucible), tilt the furnace and pour out the hot water; (Effect) Send the hot water to the casting department via a receiver, etc.; (iii)
Cast by pouring hot water into a mold.

In such a process, step (11) may be omitted and the hot water may be poured directly into the mold from the furnace.

Although it is a less commonly used method, there is also known a low-pressure casting method in which hot water is injected into a furnace or crucible in a pressure vent cell using a ladle, and the hot water is then placed into a mold at 140,000 positions along a pipe line using gas pressure. . Since this method presses the hot water, it eliminates the problems of turbulence that occur during pouring and produces high-quality castings. If turbulence occurs when pouring or pouring hot water, metals that contain large amounts of aluminum, magnesium, etc. will undergo oxidation, making it difficult to remove the oxides. I can't get it.

In the case of the above-mentioned known method, the hot water flowing down from the furnace etc. to the casting station is caused by a head in the channel, or the head ranges from 0.5 meters to several meters, and the flow rate is low. Quickly, the flow of hot water became strong,
A state of turbulent, stirring flow occurs.

In addition, the method of melting the metal in a furnace directly connected to the mold and pumping it into the mold eliminates the turbulence of hot water, is suitable for producing oxidizing alloy pastes, and produces high-quality cast products. However, this method is inferior in productivity due to bunch production. In addition, processing such as defoaming from flowing hot water may involve 1) swelling or contamination in the hot water, and an intermediate section or stage is required to remove this, or it may take a very long time. As the removal processing time increases, the production efficiency of u, i manufacturing increases dramatically.

As described above, it is difficult to efficiently produce high-quality cast products using known methods.

In an attempt to solve the problem described in i'+ii, Noei
Production of Aluminum Alloy VI Construction by Gear/Bell in January 1981, No.
, :(, Vol.

It was announced on 221. According to this, hot water from the furnace flows down into the casting section and is forced into the mold by a pump for casting, but satisfactory results have not been obtained.

Therefore, this invention solves the problem of turbulent flow of hot water and oxidation caused by it, which could not be solved by conventional technology, and enables high-quality casting products to be manufactured with high efficiency even when using metals that are easily oxidized. The purpose of this invention is to provide a method and apparatus for achieving this goal.

According to this invention, the flow of hot water flowing down from the furnace or the like toward the casting section becomes very calm, and no turbulence occurs.

In this description, a violent shield flow or turbulent flow refers to a flow in which a large amount of oxides are formed on the metal. If the head in the flow path of the hot water is 200 m+n*, or if this is rubbed, the amount of oxides generated will increase, and the quality of the cast product will deteriorate significantly. Also, if the head is 200 m + n or less, oxidation will occur or the minimum acceptable quality will be ensured. Furthermore, the head is 10 (lIIl
When it becomes un, the decline in quality can be stopped to some extent,
When the head difference is around 50 mm, there is no oxidation phenomenon that causes quality deterioration, and high quality #J relics can be obtained.

This invention consists of two steps: melting metal in a melting furnace, flowing the molten metal from the melting furnace to a casting section using gravity, and pumping the molten metal into a mold in the casting section. When flowing from the furnace to the casting section, the distance between the highest water level of the molten metal in the pouring section of the melting furnace and the highest water level of the molten metal in the casting section is such that it causes severe turbulence. A metal melting and casting method characterized by:

In addition, the inventions 1 and 2 are equipped with a) a melting furnace, a casting section, a UJ-type pump for sending molten metal from the casting section, and a means for flowing molten metal from the melting furnace to the casting section using a heavy type J, and the molten metal is 0;
It consists of a structure that uses the head difference of each part of j.
The gist is also the point of metal melting and casting equipment in which the head difference is such that it does not cause turbulence in the flowing molten metal.

In this invention, the receiver is the top of the molten metal in the casting section.
It is located below the hot water IIγ so that hot water is always present in the receiver during the casting process.

In addition, the bottom of the basin is the lowest water level of the hot water in the casting part, Y
It can also end up being empty unless a continuous supply of hot water is provided from the furnace.

The channel may be sloped or curved downward toward the flow, i.e., the casting section.

When the tray is curved downward, the curve on the upstream side is steeper than on the downstream side, and the downstream side is horizontal or gently curved to slow the flow rate of hot water and prevent turbulent flow of hot water. You can also do it.

The hot water stored in the casting section is pumped to the SJj mold using a set of electromagnetic pumps or pneumatic pumps. Since these pumps have no moving parts, there is no turbulence in the pumping of hot water.

It is also possible to install a storage furnace-like structure in the casting section so that hot water accumulates at a predetermined level in the casting section.

, the second storage furnace constitutes the - section of the casting section.

If the surface area of the storage furnace is increased, many castings will be cast, and in order to prevent the gap between the melting furnace and the casting section from widening, the hot water in the casting section will be drained from the furnace and tapped. There is no need to raise the water level. Furthermore, since such topping is not necessary, the casting operation (which would otherwise have to be interrupted for topping) is not interrupted, and productivity can be greatly improved.

A filter device is provided in the hot water flow path described above, for example,
The second invention also makes it possible to remove pure substances from the hot water flowing down to the casting section by providing a receiver and a casting section.

According to this invention, all pretreatments for the metal to be cast, such as defoaming, 11 (L gas, 7 luxing, atomization, alloy ratio, etc.), are carried out in the melting furnace,
The impurities generated by this process are removed by the filter device described in 111j, and casting in pure hot water is performed by DJ.
Becomes Noh. And since all the hot water that flows into the casting section is clean, SJJ parts are kept in a lean condition, freeing them from troublesome maintenance problems.

The spout l11 ('J tube) installed in the melting furnace is designed to allow hot water to flow into a receiver by tilting the melting furnace, or to flow the hot water directly into the casting section if the receiver is not available. However, it is possible to reduce the difference in height when pouring hot water, and it does not cause a drop in quality.

According to the invention, it is possible to use a tilted hearth with a roof of radiant heating stages as the melting device, in which case the metal ingots or scraps are transferred to the hearth-L.
The liquid is melted in the casing and allowed to flow down to the casting section with or without a sump. In this case, the head of the hot water should be concealed by bringing the end of the catch basin closer to the casting part, and if there is no catch pipe, the outflow part of the l-' end of the hearth should be moved closer to the casting part. By doing so, it is possible to flow the hot water all the way through the atmosphere and supply it to the sink.

A plurality of melting furnaces could be installed, each of which could be communicated with the casting section by a separate receiver or by a manifold receiver; , further with or without a filter device,
The furnace and casting department can be directly connected.

Electrical energy is used to heat the melting furnace, thereby preventing surface oxidation of the hot water and generation of hydrogen gas due to the generation of steam produced by heating the oil-fired furnace. This electrical energy serves as driving energy for heating means, pumps, filter devices, etc. provided in the device.

In metal melting, it is preferable to prevent turbulence from occurring in the hot water. Into the furnace (crucible)
may be heated by surrounding a heating wire or by dielectric heating means (the crucible is electrically conductive).

After melting, make sure that there are no oxidized parts in the melted water, feed it in a gentle flow, and slowly pour it into the mold.
It is possible to prevent the occurrence of blowholes and to make the weave denser.

This invention applies to casting of all metals, especially non-ferrous gold kJ.
'a, 1st row is aluminum magnesium 1. These alloys are ideal for casting.

Aluminum alloy castings (for example, 8l-7Si-0,5
The porosity of the MB type is from Iν(Il,% ((1.5 to 2vo1.%) to at least 0.1vo
1%, typically O,(lI-0,0(l) can be reduced to vo1%.

The YJ product according to the second invention does not contain good factors such as sand, oxides, and oxide films. If sand particles or oxide particles are included, it may cause wear of the mold, etc., but the casting method according to the present invention can extend the life of the mold and the tool. The formation of an oxide film reduces the liquid tightness of the cast product, and reduces the mechanical strength and durability. Cast articles according to the invention have increased strength by at least 20% as measured by elongation testing.

According to this invention, the quality of the cast product is high and the productivity is high. With a high quality Type 91 and proper alloy composition, castings according to the invention can be cast in mass production conditions.

When an aluminum alloy having the following composition was cast according to the second invention (1), unexpectedly good results were obtained.

Si](1,0-'11.5Cu,
2.5 ・-4,0 H,, (to 1,3-0,6 Fe0 ・0.8 Mu O, 0.4 Ni O・-0,13 Zn O-3,0 Pb O~ 0.2 Sn O ~ 0.1 Ti O = 0.08 Cr O - 0,05 Ordinary (dej adjunct 0 -0.09 (for each) Aluminum balance/Recon Jl No., magnesium content is as follows. As; ', ;i Hl, 5-11.5C+12,5
・～ :(,5 H80,3-,0,5 alloy for 1 to 8 hours at 190-210°C1 or 1 to 12 hours with water or polymer, 490 =
5] 0”C annealing, 1-8 hours, 190...210
°C aged.

11; Alloys listed in j have mechanical properties similar to those of
Ru.

0.211S UTS El
Brinell hardness Hl'a IJIPa
%ll111 1:io~14(119+1
~2001.2 1,4 90~1002180~20
0 210-220 0.8-. 1.0 95~10
53 300-330 300-340 0.5-0.
8. 110 to +40n11, 1 indicates only permanent casting, 2 indicates aging treatment, and 3 indicates solution heat treatment.
Annealing and aging treatment.

According to the second invention, a high quality product can be obtained by casting an alloy having the above composition.

Casting of second grade aluminum alloy) is as low cost as casting using a scrap. The alloy composition with a minimum loss of 1 is as follows.

Si 6.0 ・~7. OCu
1.5 Mg0.5~1,0 Fe0.7 No 0.3 Ni O,15 Zn 1.5 Pl+ 0.2 Sn 0.1 1'i 0j)4 ・-0,05Cr
O,02-0,05P 20p
pm The alloy composition according to the present invention is substantially the same as the alloy composition which can be cast at the lowest cost.

The main components of the alloy according to the invention are silicon, copper and magnesium suitable for casting, the magnesium being strengthened by heat treatment.

To increase the aging effect, the copper should be kept at about 20.5% V/month, or if it exceeds 5-4%, the castability will deteriorate and SJI cavities and shrinkage will occur.

In order to maintain strength, use magnesium hydrant at 0.
:l = 0.5%. If it is less than this, the strength will be insufficient, and if it is 16 or more, the strength will be 1 degree.
It loses its ductility and becomes brittle.

Titanium improves the mechanical properties of aluminum alloys or
If it exceeds 0.08%, it becomes harmful.

For good castability, it is desirable for the alloy to have eutectic properties, so that the 7 reasing range can be zero or narrow. The reason for this is the point in the letter.

(aNI blind 111i casting, hydrogen force insertion, prevention of oxidation and metal loss, 7 reeseing rate pull-L in the mold)
.

(I) Improved fluidity; (I) Improved fluidity; (2) Formation of a thin casting part over a wide range without high-temperature casting; (C) Surface skin by forming a solidified skin layer with a eutectic alloy; This ensures liquid tightness and pressure resistance.

This point is ideal for automobile parts. Concentrates the porosity in the deep part of the casting part and makes it possible to remove the porosity. Casting of high quality castings.

According to the second invention, the copper contin 1 in the alloy is 2.
4% to 5, and 10...11.5% to silicon (1.j given to eutectic f1). If silicone-containing or high, machine 1, r
spoil one's sexuality.

As a result of the above steps, an extremely excellent casting 'IV1' can be obtained.

Next, this invention will be described in accordance with the illustrated embodiment.
Explain.

As shown, the apparatus includes a melting furnace 10.

This melting furnace is a commonly used ji:gi (112
By tilting it, 11 g of molten metal can be poured out from the girder 1112. The molten metal is kept in a molten state on a linen such as a refractory brick (inside), and the furnace is electrically heated by an induction coil 15, and a steel case 14 surrounds the outside of the furnace. It is surrounded by an insulating lint 16.

There are 17 trough-shaped receivers from the pouring section 012 to the casting section 20. The second receiver is made of ceramic.
It is equipped with an electric heating tree 19 and has a 2-door 18. The casting section 20 is a furnace equipped with an electric heating element 22 and a die 21, and is, for example, a large furnace with a capacity of less than 1 ton/ton. Its shape is (1) self-edged, with an L-slanted shape facing either the hearth 23 or the receiver 17.

Receptacle 17 and hearth 2: (At the opening between 11 and 11, a reel 27 is provided on both sides of the filter box 24 and filter box 2), the bottom side 28 of which is connected to the box. Bottom 29. ):l) is also scratched. A filter made of a heat-resistant, fire-resistant porous phase 0 is disposed between the weir 27 and the downstream end wall of the filter box, and the filter 1 is replaceable.

The SJJ construction part 20 is equipped with a pump 32, and the pump suction -1]lJ3? teeth,! It is immersed in the molten metal in the molding part 20, and reaches the mold 35 located at the 14th part of the suction L'-W.

``During the IJJ construction work, J)''ζ is
Since the hot water 1 is sent to the mold by the pump 2, the level 17 of the hot water in the aj making section 20 is the highest level (water level 1.4 + nax, the highest level 1.7 m in
fall to The hot water H melted by the furnace 10 is transferred to the receiving tray 17.
The hot water is poured into the casting section 20 through the filter 30, and the water level in the casting section 20 reaches 17. or maximum water level 12+na×
and the lowest water level of 1.7m1n.

The water levels 1 and 1 of the hot water in the basin 17 are maintained at the same level as the water level 171 and the water levels 1 and 3 in the filter box. Furnace 10 to 1
The water level of the hot water poured out from the furnace 10 is 100 mm higher than the maximum water level F', and the lowest water levels f, +nin'-L, +n are at the predetermined maximum level depending on the position H of the shaft 11. When the temperature is reached, the hot water is poured out through a 100mm head.

This 100 IIIo head difference is up to 200 b+m, which is not very desirable.

Since the casting part 20 has a relatively large volume, the water level of the hot water, -L, is approximately 50+n higher than the temperature of the furnace 10.
+n ILL level can be maintained within a range of approximately ±50+++ m, and even when hot water is pumped up into the mold 35 by the pump 32, the water levels 1, 1- and 1, 3 do not deviate from the range. In the embodiment, the capacity of the casting section 20 is 1 ton, and hot water can be supplied to 20 molds (10 kg capacity) by pouring.
Before there is a need to top up from the lowest point, the drop must be 50 m+ higher than the highest point.
It can be less than or equal to n. In an embodiment of the invention, the casting of the engine cylinder head can be completed automatically in about 1.5 hours before top-up is required. Top of the casting department from furnace 10? There is no need to interrupt the casting operation.

According to the embodiment described above, casting can be performed continuously with high efficiency, turbulence of hot water and its adverse effects can be eliminated, and a cast product of good quality can be obtained. This is carried out through the outside air from the furnace pouring [312] to the receiving 17.
This is because the head of Outflow 4-Togi is relatively short, for example,
As mentioned above, the pouring head of hot water is ]OOm+n, at most 2.00+nm, and with such a short head, the time of contact with fire is short, the generation of oxides is small, and the generated oxides are can be removed by the filter 30. As mentioned above, the Niremen 1 of the filter 30 can be replaced, so you only need to replace it if necessary, for example, about 10 (
It is sufficient to change it every I ton of casting.

In the embodiment described above, the pump 22 may be a pneumatic type pump or an electromagnetic type pump, and in either case the hot water is sent to the casting without exposure to the atmosphere and without turbulence.

As the melting furnace 10, in addition to the structure shown in the drawings, any suitable structure may be used, such as a slanted hearth type. In this case, the hearth is at the lowest water level of 17
．． [Since it reaches River 1, the ingoft or scrap in the hearth melts and flows through the receiver and does not flow down into the fire. Also, in some cases, the hearth does not extend to the lowest water level of the hot water, but ends just before it, although the head is extremely short, but no significant turbulence occurs.

A plurality of melting furnaces may be used, and hot water may be supplied to the casting section through each receiver or a multi-shaped receiver. Furthermore, hot water may be directly supplied from the melting furnace to the casting section via a filter.

As shown in Fig. 1, the bottom opening of the tray 17 is located at the lowest level of the hot water supplied from the furnace, and
Therefore, the basin 17 is always filled with hot water during the casting operation.

As shown in FIG. 2, the bottom surface B of the tray 17a! It may be set to the lowest water level or higher than (the lowest water level of the hot water in the two cores of the casting part). In the case of , 2, if the hot water from the furnace 1o is poured in a batch manner, the receiver becomes empty after the batch of hot water is poured.

No.: Bottom surface I of (the example shown in the figure is receiver 171)
1) The bottom surface is -1, from the lowest water level L, +n in (casting part 20jLJ), and the fourth As shown in the figure), a part of the bottom surface I may be located at 1- from the highest water level L21+.

Furthermore, the bottom surface 1 (d) of the receiving channel 17 (() is curved in the direction of the flow force as shown in FIG. 5, and the hot water poured out from the melting furnace is
, receive the hot water on a gently curved surface, and keep the hot water outlet horizontal.
The flow rate of the hot water may be slowed down to allow it to flow into the manufactured product. In this case, the outlet 1-1 of the catch basin 17d is the lowest water level 1 of the hot water in the casting section 20 as shown in FIG.
, +ni++, and in the example shown in FIG. 6, the lowest water level L 2 +1)
From i n to [ζ.

, the method and apparatus according to the second invention, for example lead, bismuth,
Low melting point alloy with tzuna, magnesium, alumina l,
Suitable for casting intermediate melting point alloys such as copper, aluminum 70's, high melting point alloys such as cast iron. Steel can also be cast using the method and apparatus of the present invention, or requires expensive refractory refractories.

By using the horn method and device 6 of this invention described in +iii, 1i
An aluminum alloy having the composition shown below was cast, and as a result, PI
! Good results were obtained, which were not possible.

Alloys with the following composition were tested: IUSi 10.2'7 NiO, 1:l Cr
O,05CLI 2.9] Zll 1.
03 Normal (:I Zuimono 0.09 (each 1 and 1 Zuimono) Hg 0.45 yen] 0.06Fe0
．． 70 Sn 0.03 Aluminum Balance Hn O,:M TcO,02 This alloy has extremely good castability:! +11+
It was possible to create a solid fish with a thin wafer of n, a good weight balance, and a rich structure (pore distribution of 0.01% by volume or less). The casting temperature was 630°C or higher, which saved melting energy and caused little oxidation of the surface of the hot water, causing no problems.

The large amount of 2n and the relatively high level of tolerance for So in the alloy merits Note 1].

The suitability of the alloy for sand casting by the method described below is extremely satisfactory. 0, 3+n+n surface finish is diamond]
To the tool, J, υ times (1) 1 cut, A1.
JA!
! '+ Do. Cranking, etc.' (Koyoru work, nun') 1° 1 t worth of damage, the edges are sharp,
Gradually wears out.

Tests of sand-cast bars made of alloy No. 111j were carried out in the following manner, and the properties were as shown in Table 1.
1 Rarenoko. At the top of "Co!Halloy 2" in Table 1, (1) shows the characteristics of the test 1 No. I bar made only in ω1, and (2) shows the characteristics at an aging temperature of 205°C for 1 hour and 2 hours. (3) shows the characteristics of annealing at an annealing temperature of 510° C. for - hours and aging at 205° C. for 8 hours.

Table 1 also shows the British Standard 8S+
CHI at 490: (,1N27.1.H2+,1
．． Mechanical properties of I) TD sand cast samples (bars) of ', ;i, cuJIH alloys known as +4, respectively, are also shown.

Table 1 also shows that Ll'12.1. The mechanical properties of the DTD Chill Test VJ bars with IM8 alloys (these are alloys that apply only to pressure die casting and gravity die casting I) known as H24,1, +26 are also lower.

-N,,-,1 (1,2+'s UrS l:I Frisnel HPa Interval a % Hardness 11[3 (]) l:(51951,:l 95Cas
alloy (2) 190 215 0.
9 1 (102 (3) 315 320 0
,7 1251.1413 Complete heat treatment 200
200 0 115LH27SJJ only 90 150 2 75LM2] Casting only 130 180] 851,
H4 casting only 100 150 2 70
1, +4 complete heat treatment 250 280]
1 (151, H2 casting only 90 180
2 80+, H24 casting only 11.0 2
00 2 851, +26 statute of limitations 1
80 230 1' 105 As is clear from the table above, the results obtained for the sand cast alloy are only slightly approached by the chill cast sample (bar).
Only. The test results in Table 1 for the alloys are:
The silicon grain size of the cast material is reduced by using an alkali or alkaline earth metal such as sodium or tin. This process will help if there is Mll in Chofu, it will be strong, and its durability will be 1. The properties of the known alloys listed in Table 1 were obtained by two cumbersome and unreliable methods. This is what happened. The properties of the alloy have been achieved without such steps and are extremely reliable, easy to process, and inexpensive.

The alloy of i'+ii is further given a special characteristic of +1 or lq by adding f.

Table 2 shows the test results as follows.

Group 1: +11'11 test bars were obtained by Norcon sand casting.

1st) page a(i) Co5alloy 2-j
'lJ construction only, a (to the effect) of paragraph 1 Co5alloy 2
- Aging treatment Section 1 b(i) LH25-Casting only Section 1 b(ii) 1825 - Solution treatment
Aging treatment group 2: 11'll) Test bars were obtained by casting using a Norcon sand mold (hot water was poured manually).

23rd true a(i) Co5alloy2 jl
J, 7-size only, Section 2 a(ii) Co5alloy
2-Aging treatment paragraph 2 b(i) Ll) 25
A1. b(i i ) of the second term only for i-built
LH25-Solution treatment/11,1 effect treatment Group 3: D11] The test bar was molded using a silica sand mold.
The hot water was obtained by manual casting.

Section 3 a(i) Co5alloy 2 - Casting only Page 3 a(ii) Co5alloy 2 Temporary treatment Section 3 Mi) l, M2S - Casting only Section 3 b(ii) l, M2S - Solution processing/
Aging treatment In all groups, Co5al lo
The aging treatment of y2 was carried out at 200°C for 4 hours,
1.1125 solution treatment is annealing with polymer for 12 hours, 530 ° C 1 aging treatment is 2 hours, 190 °C
It was carried out at °C.

The results in Table 2 are the average of a large number of tests, with an exception of less than 3-4% in the Group 1 test.

Tests in group 2.3 were carried out using conventional sand molding techniques, and an exception of up to 10% was observed.

The numbers in Group 2, ;), due to their wide variation, are the average values of the most carefully and carefully tested tests and represent the best results from manual construction.

-Table One Winter 0.211S Ui'S Ella (
ii) 205 220 0.8b(i
) 105160 3.3b(ii)
27 (13001, 8a(i) If)I
154 1.12 a(ii) 158
192 1.01+(i) 97
149 2.11+(ii) 268 2
88 1.1a(i) IH) 15
11.1: i n (ii) ] G8 197
0.91+(i) 102 142
1.71] (ii) 2f31' 28
1 1.1 These numbers indicate the following.

(a) Comparing the numbers of group 1 with those of group 2.3, the method of the present invention has considerably superior properties compared to the conventional method.

(1)) First term a(i)(ii): Second term a(i)(i
i); Comparing the numbers in item j3, a(i), with Ike's, the properties of the above-mentioned alloys are considerably better than those of known alloys.

(c) Comparing the numbers in the first term a(i) (i i ) with Ike's, the properties obtained using the alloy, method, and apparatus described above are extremely excellent.

An alloy test bar according to the invention; 1. The M25 alloy test bar was obtained by using the saw method and equipment described above.

In this specification, compositions are given in % by weight.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an example of a casting apparatus according to the present invention, and FIGS. 2 to 6 are explanatory views showing modifications of the apparatus shown in FIG. 1, respectively. 10.10a, 101], 10cJOd, 10e...
Melting furnace. 11...Melting 13 God 1 Shik no Suke 12...)i, Outll 17, I'7a, 171'', 17〈1.17(j, 17
c...Uketoi 20.2(la, 201+, 20(:,
20d, 20 (...vl construction part 24.24a, 241
+, 24(, 24d, 211(...Filter links: 12, :i2a, :i21+, :I2c, :
(2d, :(2c... Emp; (13, :I5a, :
15b, :F+c, :15cl, :(5e...Mold and 1 other person procedural amendment (method) (Patent Office Examiner) 1. Indication of 'ji Ino 1 1982 Patent Application No. 89027 2 Name of the invention Metal melting and casting method and apparatus 3 Relationship to the case of the person making the amendment Name of applicant Rosworth Research and Development Limited 4 Agent address 1-1-5 Minami-Aoyama-chome, Minato-ku, Tokyo , Amendment order 1: +('' (Voluntary) Procedural amendment (J exam) (Patent Office examiner) 1. Indication of the case Patent application No. 89027 of 1989 2. Name of the invention Metal melting and casting method and 0. Device 3, Person making the amendment Relationship to the case Applicant name (Nari O Rothworth Research Ano) 8. Develov 07 Noto Limited 4 Agent address Minami Aoyama-cho, Minato-ku, Tokyo] 1 No. 1 No. 5 Amendment Order No. 1” () (Date of dispatch) IO, 25th 1980 7 Details of details of Sodeichi 1!, ! Correct IJ to "Figures 2 to 6" 1, 367- on the side

Claims (1)

[Claims] (1) From the step of melting metal in a melting furnace, flowing the molten metal from the melting furnace to a casting section using gravity, and pumping the molten metal into the casting section by a pump. Therefore, when flowing molten metal from the melting furnace to the casting part, the drop between the highest water level of the molten metal in the pouring part of the melting furnace and the highest water level of the molten metal in the casting part is such that it does not cause severe turbulence. A method for melting and casting metals, which is characterized by a distance. (2) The method according to item 1 above, wherein the head is in the range of 50 to 200 mm. (2) In the process step in which molten metal flows from the melting furnace to the receiver and then from the receiver to the casting section, the highest water level of the molten metal is the highest at the pouring section of the melting furnace, and then 3. The method according to item 1 or 2, characterized in that the casting part is discharged in stages. (4) A configuration that includes a melting furnace, a casting section, a pump that sends molten metal from the casting section to the mold, and means for flowing the molten metal from the melting furnace to the casting section by gravity, and the molten metal is made to flow down by utilizing the head difference between the above-mentioned sections. A metal melting and VJ forming apparatus, wherein the head is such that severe turbulence does not occur in the flowing molten metal. (5) The device according to item 4, wherein the head is in the range of 50 to 200+nin. (6) A receiver is provided, one end of which is located at the pouring point 1 of the melting furnace, and the other end of which is located at the entrance of the casting section, so that the highest water level of the molten metal in the receiver is at the pouring point 1 of the melting furnace. 6. The apparatus of claim 5, wherein the molten metal is located between the highest water level in the casting section and the highest water level of the molten metal in the casting section. (7) The device according to item 6 of the nij, wherein the bottom surface of the receptacle is at the same height as or lower than the lowest water level of the molten metal in the casting section. (8) The apparatus according to item 6, wherein the bottom surface of the receptacle is above the lowest water level of the molten metal in the casting section. (9) The device according to any one of items 6 to 8 above, wherein the bottom surface of the tray is horizontal. . (10) The bottom of the tray is sloped toward the casting part11
The device according to any one of Items 6 to 8J1'i of Section 1j. (11) The device according to items 6 to 8 above, wherein the bottom surface of the tray is curved in the ζ direction, and the kerf on the light side is tighter than on the flow side. (12) The device according to Items 4 to N of Paragraph 1111, wherein the 141 part for maintaining the water level of molten metal in the manufactured product is modified. (1:i) The apparatus according to item 4, item 4, item 12 of item 1iij, in which a filter device is provided in the flow path from the melting furnace to the manufactured product. (14) The metal to be melted is aluminum, magnesilano 1 , or an alloy thereof; the method according to any one of paragraphs 1 to 13 of paragraph j. (15) The metal to be melted is an aluminum alloy having the composition 1. The method according to item 14, which is: Si 10.0-11.5 Cu 2.5-4.0 Mg 0.3-0.6 1.e O= 0.8 Hn O. 0.4 N10 ~0.:(7110~:(0 yen JO□=0.23110~
0.1 "1 0 ~ 0.08 Cr O-0,05 Usual accompaniments O ~ 0.09 (for each) Aluminum balance (16) Said No. 15 containing silicon, copper, and magnesium as listed in F The method described in Section 1. Si 10.5 ~ 11.5 CLI 2.5 ~;
The method described in section. (18) Using the alloy having the composition described in the above item 15 or 16, the method according to the above items 1 to 3 or 14 to 17, and/or the method described in the above item 4. Part 1: (Cast product 1 cast by low-pressure casting using the apparatus described in paragraph 1, (+9) vj manufactured product described in item 18 having the mechanical properties described in 'F'. o: 2 ps uTs F+ Brinell hardness −Ichigo−−−−−−−−Rule−9j−11
[1-1 130-140 190-200 1.
2・~1.4 90~+002180~200 21
0~220 0.8~1.0 95~+053300
~330:100~340 0.5=0.8 11
0 to 140 In addition to the above, 1 is "casting only," 2 is "aging treatment," and 3 is "solution heat treatment, annealing, and aging treatment." No defects that can be detected with the naked eye.