JPS61259866A - Method and device for casting iron - 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 [Industrial Application Field] The present invention relates to metallurgy, and more particularly to an iron casting method and a gravity die casting apparatus.

The present invention is useful for manufacturing castings, such as engine cylinders, and the resulting castings meet the strict requirements of having a fine structure, high density, good workability, and good wear resistance. can be satisfied.

[Problems with conventional technology]

There are known iron casting methods (for example, Soviet inventor's certificate No. 495147, international classification number 82.2D1510).
0), this known casting method involves pouring molten metal into a mold, retaining the molten metal in the mold until a casting surface conforming to the mold is formed, and The method comprises the steps of separating the mold components to create an adjustable gap between the mold and the casting, and cooling the casting until it solidifies. The gap is formed to suppress heat dissipation from the casting part in order to control the cooling rate of the casting from the viewpoint of manufacturing the casting without using a chiller.

The shape of the gap is an important factor in extending the life of the mold. The reason for this is that the time that the mold is in direct contact with the hot casting can be reduced.

However, cooling the casting until it is completely solidified in the gap formed by separation of the molds lengthens the process cycle and thus reduces the efficiency of the overall process. Moreover, the resulting castings have non-uniform peripheral properties.

USSR Inventor's Certificate No. 1,107,957 discloses a method for casting iron, in which a molten metal or lagoon is poured into a mold and the lagoon is poured into the mold until it becomes skinned. The cast product is pulled out of the mold and transferred to an extension type cooling chamber for cooling. This cooling chamber has a surface that blocks heat from the casting. In this cooling chamber, a uniform gap is formed between the casting and the cooling chamber, and a layer of heat-resistant material is formed on the wall of this cooling uJ chamber to prevent the casting from cooling rapidly. The casting is sufficiently solidified and annealed in the cooling chamber before being taken out.

However, since the temperature inside the cooling chamber changes depending on the speed at which hot water is poured, conditions for heat exchange between the casting and the cooling chamber become poor. The humidity in this cooling chamber increases as the hot water injection rate increases, which reduces the efficiency of heat exchange and slows down the solidification of the casting.

The quality of the products obtained with that type of casting method is comparable to that of clay mold castings. The reason for this is that when the lagoon is poured slowly, the structure of the casting becomes coarse and its strength decreases.
The temperature of the cooling chamber is likewise reduced, since the heat exchange between the casting and the cooling chamber is improved accordingly. The faster the casting solidifies, the harder the surface layer of the casting becomes, and its hardness is greater than is normally required for good workability. The reason why the surface layer of the casting becomes too hard is that the cementite in the surface layer of the casting is not sufficiently reduced.

The gravity type mold casting equipment used to carry out such a casting method consists of a mold support plate having a mold component and a drive mechanism for the mold component, a bottom plate with a core attached thereto, and a conveyor for the bottom plate. and a casting cooling chamber having a surface that blocks the dissipation of heat from the casting. This casting apparatus can be provided with a plurality of cold W chambers, each of which is connected to the bottom fII.
It can be attached to and detached from the Iwi transport mechanism, and this bottom board transport mechanism may be an endless conveyor that moves horizontally, or may be a turntable. After a skin is formed on the surface of the lagoon in the mold according to the mold, the mold is separated, and the casting placed on the bottom plate of the turntable is surrounded by the wall of the cooling chamber and taken out together with the bottom plate from the hot water injection area. . After this casting is placed in an apparatus until solidification is completed and the surface annealing is completed, the mold is removed and the casting is taken out.

However, in the removable cooling chamber, the temperature of the cooling chamber cannot always be kept constant.

If the rate of pouring hot water is increased, the temperature in the cooling chamber will be higher than the temperature that is the optimal heat exchange condition between the mold and the casting, and conversely, if the lagoon is poured gradually, the temperature in the cooling chamber will be higher than the optimum temperature. This is because the quality of the obtained cast product inevitably deteriorates. Furthermore, if a plurality of extension type cooling chambers are provided and a drive mechanism is provided, the structure becomes extremely complicated and its operation becomes difficult, whether it is a turntable or a horizontally moving conveyor. This drawback also applies when a device is provided to take out the cast product from the bottom plate. Another disadvantage of Haku is that if a turntable or conveyor is installed, the required land area becomes extremely large.

[Purpose of the invention]

An object of the present invention is to provide an iron casting method capable of cooling iron castings into a desired structure, and a gravity casting device with a simple structure and high reliability for carrying out this casting method. It is in.

[Summary and effects of the invention]

The purpose is to inject molten metal, i.e., lagoon, into a mold, hold this hot water in the mold until the skin of the VII structure is stretched, remove the casting from the mold, and block the heat radiation of the casting. A method for casting iron comprising the step of cooling the casting in a cooling chamber having a surface, in accordance with the invention, the temperature of the heat-insulating surface of the cooling chamber being 500 to 600" below the surface temperature of the casting. This is achieved by a casting method that maintains a low It can be solidified at an optimal rate to achieve the desired texture and hardness.

The present invention also provides a gravity casting device, ie, a gravity die-gas device, for carrying out the casting method according to the present invention. This gravity casting device includes a bed, a mold support plate having a mold component and its driving mechanism, a bottom plate to which a core is attached, a conveyance mechanism for the bottom plate, and a wall body that blocks heat radiation of the casting. In accordance with the invention, in a gravity mold casting apparatus, the cooling chamber has a passageway therethrough, in which a conventional heating device and an automatic temperature control device are installed. the automatic temperature control device cooperates with the heating device to maintain the temperature of the cooling chamber within a preset temperature range; The board is located above the bottom board transport mechanism, and this bottom board transport mechanism consists of an endless conveyor made of vertically moving beams.A jacket member is firmly fixed to this endless conveyor, and the bottom board is attached to the jacket member. is mounted for radial movement, and the mold support disk is connected to a component of the mold.

By fixedly mounting the cooling chamber on the bottom plate conveying mechanism, a vertically movable endless conveyor can be employed, so that a casting taking device can be omitted.

By installing a heating device and an automatic temperature control device in the cooling chamber, the temperature inside the cooling chamber is kept at 50° below the temperature of the casting.
It is easy to maintain the temperature in a low range of 0 to 600°C.

This in turn means that favorable operating conditions can be ensured for adequate heat exchange between the casting and the cooling chamber.

By allowing the bottom plate to move horizontally within the jacket member, the assembly of the mold components and the bottom plate can sufficiently increase the dimensional accuracy of the casting, thus improving the mold configuration. It is possible to prevent lagoon from leaking from the joint between the section and the bottom plate.

By connecting the mold component to the mold support plate, the mold assembly can produce a casting with good finish accuracy and good machinability.

The gravity casting apparatus has two pairs of mold support plates, and the two sets of mold support plates are used to combine the mold components on the bottom plate in the drying and pouring area. Preferably, they are arranged on both sides of an endless conveyor consisting of a beam on which the plates are moved, at an angle of 45 DEG to the axis of this conveyor.

In this way, it is possible to improve the manufacturing capacity of the gravity casting apparatus and improve the quality of cast products. If only one pair of mold support plates is used continuously, the mold components will overheat when the lagoon injection rate is increased. In this case, heat exchange between the casting and the mold becomes poor, so the casting must pass through a cooling chamber at a temperature higher than the predetermined temperature. Furthermore, if the heat exchange between the casting and the mold changes, the metal structure and quality of the casting will deteriorate significantly. If two pairs of mold support plates are used, it will be possible to
Since the molds can be used alternately, the conditions for heat exchange between the casting and the mold can be made favorable. Therefore, since the casting can be brought to a preset temperature and sent into the cooling chamber, the casting will have the desired metal structure and hardness after heat exchange with the surface of the cooling chamber. By alternately pouring hot water into two sets of molds, you can prevent the molds from overheating.
The life of the mold can generally be extended.

A pair of mold support plates are placed at 45° with respect to the axis of the conveyor.
By arranging them at an angle of .degree., the mold components can be spaced apart to be in a neutral position, and the casting can be moved between the spaced apart mold components using a conveyor.

The mechanism for moving the mold support plate includes a parallel linkage coupled to the mold support plate and the bed, and the mold support plate movement mechanism includes a vertically fixedly mounted double-acting power cylinder. The double-acting power cylinder has two pairs of levers, and the two pairs of levers are arranged symmetrically to the rond of the double-acting power cylinder and along the separation line between the mold components of each pair. The levers of each pair project vertically in opposite directions and are connected to the parallel linkage via retained and adjustable length tie rods.

The drive mechanism for the mold support plate according to the present invention has a simple structure and allows easy casting operations. A single power cylinder drives the two pairs of mold support plates synchronously and accurately positions the mold support plates in a neutral position, allowing the conveyor to move the castings from the drying and pouring area to the cooling chamber.

As is clear from the above description, according to the casting method and casting apparatus based on the present invention, it is possible to improve the quality of the surface layer of a casting and to improve the tolerance range of mechanical processing. Further, according to the present invention, the strength is 15 to 20% greater and the density is 0 compared to when using conventional clay molds.
．． Castings larger than 2 to 0.3% can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The iron casting method according to the present invention is carried out as follows.

Hot water is poured into a mold and held in the mold until the hot water forms a skin of a predetermined shape. When this skin tightens, the lagoon becomes cementite. Thereafter, the mold parts are separated.

Next, the casting is placed in a cooling chamber, and the gap between the casting and the wall of the cooling chamber is used to disperse the casting.

When the mold is opened, the temperature of the surface of the casting is between 960 and 9.
The temperature is 80°C. If the temperature of the heat dissipation surface is maintained at 500 to 600° C. lower than the temperature of the surface of the casting, heat exchange can be performed satisfactorily, and the structure of the casting can be changed to pearlite without cooling.

If the temperature difference is less than 500°C, the surface of the casting will be heated to 1130°C due to the heat inside the casting. As a result, the solidification inside the casting is delayed, so that m of ferrite increases, graphite is included, and the structure becomes coarse. Moreover, at such high temperatures, there is a risk that the casting will become deformed due to the static pressure inside the metal that occurs in the unsolidified parts inside the casting.

If the temperature difference is 600° C. or more, cementite decreases slowly and the amount of heat inside the casting is insufficient, so that cementite does not completely disappear. The surface of the casting is 10
If the temperature is 10°C, cementite will be 6 to 7%.

The casting is held until solidification and annealing are completed and then removed from the cooling chamber.

The gravity casting apparatus according to the present invention includes a bed 1 (FIGS. 1 and 2), a hot water injection device 2 including a mold support plate 3 and its drive mechanism, a mold component 4, and a bottom plate (see FIGS. 1 and 2) to which a core 6 is attached. Third
), a bottom plate conveying mechanism consisting of a vertical moving beam type endless conveyor 7 of a known suitable structure, and a cooling chamber 8 (a first
Figure 2).

The mold supports 5J3 included in the drip injection device 2 may be arranged in pairs on both sides of the conveyor 7, as shown in FIG. 1, or in pairs 9 or 10. These two pairs of mold support plates 9 and 10 are used to alternately draw and unite the mold components 4 on the bottom plate 5 in the lagoon injection area, and are provided on both sides of the conveyor 7 with respect to the axis of the conveyor 7. 45°
It is arranged so that it forms.

The cooling chamber 8 (FIGS. 1 and 2) forms a U-shaped passage which extends into the bed 1 after the hot water injection device @ 2 and above the upper horizontal run of the conveyor 7. It is fixedly attached to. A double door 11 is provided at the end of the cooling chamber 8, and this jj! 11 is the conveyor 7 due to the action of the spring 12.
Open in the direction of movement.

This door 11 is provided to reduce convection inside the cooling chamber. The inside of the cooling chamber 8 is lined with refractory bricks 13 to block heat radiated from the casting. This cooling chamber 8 is equipped with a conventional heating device 14 and an automatic temperature control device 15, and the heating device 14 and automatic temperature control device 15 keep the temperature inside the cooling chamber 500 to 600 degrees lower than the surface temperature of the casting. ℃ is maintained at a low temperature so that heat exchange can take place under optimal conditions.

The vertically moving beam type endless conveyor 7 has a conveying member 16 (third
and FIG. 4), and the outer sheathing member 1
7 is fixedly attached. A bottom plate 5 is provided inside this outer cover member 17.
is attached so that it can be moved. For this purpose, the diameter of the inner part 18 of the jacket member 17 (FIG. 3) that accommodates the bottom plate 5 is larger than the diameter of the bottom plate 5. An annular projection 19 on the inner surface of the jacket member 17 prevents the bottom plate from deviating from the jacket member interior space 18 when the conveyor travels downwardly.

A power cylinder 21 for driving the conveyor 7 is attached to a plate-shaped member 20 (FIG. 4), and this plate-shaped member 20 is attached to the bed 1 at the lower running portion of the conveyor 7. A pawl 23 is fixed to the rod 22 of the power cylinder 21, and this pawl 23 engages with the conveying member 16 of the conveyor 7. When the rod 22 is lowered, the conveyor 7 stops.

When the Orad 22 is pulled up, the pawl 23 engages the next conveying member 16. When repairing the power cylinder 21, the power cylinder 21, together with the plate member 20, is rotated about the vertical mounting axis of the power cylinder 21.

A pair of mold support plates 3 (Fig. 1) or two pairs of mold supports 5J
9 and 10 (FIG. 2) are connected to the mold component 4. For this purpose, a vertical rotating shaft 24 (FIGS. 3, 5 to 9) is attached to each mold support plate, and the mold component 4 is coaxially attached to the upper and lower holes into which the vertical rotating shaft 24 is inserted. is,
With this structure, the mold component is centered around the rotation axis,
It can rotate in a plane horizontal to the mold support plate.

In a gravity mold casting machine having a pair of mold support plates as shown in FIG. They can be separated.

As shown in FIG. 2, when the gravity casting apparatus has two pairs of mold support plates 9 and 10, the drive device for the two pairs of mold support plates consists of a parallel link mechanism and a lever mechanism.

This parallel linkage has a flat, one end of each tie rod being connected to the bed 1 and the other end being connected to the mold support plate 3.

The lever mechanism has a double-acting cylinder 26, which is fixed perpendicularly to the bed 1 and has a rod 27, to which a sleeve 28 is fixed. levers 29, 30 are arranged symmetrically and along the separation line of the multiple mold members. The axes of the multiple pairs of levers 29 and 30 are arranged three-dimensionally orthogonally. The multiple pairs of levers are oriented in opposite directions in the vertical plane, with one pair of levers extending upwardly from the sleeve 28 while the other pair of levers extends downwardly. A tie rod 31 whose length can be adjusted is attached to the end of this lever.

The other end of this tie rod 31 is connected to a corresponding tie rod 25 of the parallel link mechanism of each mold support plate 3. A pair of levers opposite in direction in the vertical plane allows the pair of mold support plates connected to the levers to be moved in opposite directions irrespective of the direction of movement of the rod of the power cylinder. When one pair of mold support plates is separated downward in the figure, the other pair of mold support plates are brought together. Also, when one pair of mold support plates is in a fully joined position, the other pair of mold support plates are spaced apart and in the most distant position, and so on.

When the rod 27 is pulled to 1/2 of the stroke, all mold support plates 3 come to the neutral position. This position is equidistant from the axis of the bottom plate, and as one pair of mold support plates approaches the neutral position from the position where they come together, the other pair of mold support plates approaches the neutral position from their separated position. . This neutral position transports the casting onto the conveyor 7.
This is a necessary position for transporting hot water from the injection point to the cooling chamber 8.

[For production]

The gravity casting device operates as follows.

Before the start of pouring hot water, the parts of the molds 4 (FIG. 2) fixed to the mold support plates 3 of the first pair 9 are drawn together on the bottom plate 5 and joined together. The bottom plate 5 is housed in a jacket member 17, which is firmly attached to a transport member 16 of the conveyor 7.

, the respective parts of the second pair of ten mold support plates 3 are spaced apart and located at the farthest positions. The rod 27 (FIG. 5) of the vertical double-acting power cylinder 26 is in the lowest position in the figure.

The lagoon is injected into the interior space of the mold in a conventional manner through a hollow core 6. The injected hot water is held there until the skin forms in the shape of the mold. When this taut skin becomes strong enough not to collapse even when moved, the O-rad 2 valve (Fig. 6) of the power cylinder 26 is raised by half the distance of its stroke. Then, the mold support plates forming the pair 9 are separated from the combined position of the molds to the neutral position. This pair 9
The separation of the mold support plates is carried out by moving the levers 29.30 and tie rods 31.25.

In this way, one pair of mold support plates 9 moves to the neutral position, and the mold support plates of the other pair 10 move from the farthest position to the neutral position (Fig. 7). At the same time,
The rod 22 (FIG. 4) of the power cylinder 21 is retracted, so that the conveying member 16 of the conveyor 7 is moved by the pawl 2 which engages said conveying member in the lower running part of this conveyor 7.
Sent forward by 3. When the rod 22 is retracted, the pawl 23 engages the next conveying member. When the conveying member 16 holding the casting is fed into the cooling chamber 8, the door 11 of this cooling chamber is forcibly opened by the advancing conveying member, and this opened door is moved by the action of the spring 12. to return to the old position. During this time, the next conveying member 16 carrying the core 6 attached to the bottom plate 5 is sent to the position where hot water is poured.

The rod 27 of the power cylinder 26 (FIG. 8) then returns to its uppermost position in the figure. At that time, one mold support plate 3 of the pair 9 is moved from the neutral position to the configured device,
The other pair of mold support plates 10 are brought together and combined (eighth
(Fig. and Fig. 9).

Thus, the second pair of mold supports 10 begins to operate, and the first pair of mold supports 5JI9 are cooled. This method can prevent overheating of the mold and improve the production efficiency of the gravity mold casting apparatus.

Next, pour the lagoon into the mold and hold the water until a tough skin forms on the surface.

Thereafter, the rod 27 of said double-acting power cylinder 26 is retracted by half of its stroke.

The mold support plates 3 of the second pair 10 are pulled apart and moved to a neutral position, and the mold support plates 3 of the first pair 9 are pulled together and moved to a neutral position. This moved state is the seventh
As shown in the figure.

When the rod 22 of said horizontal power cylinder 21 is retracted, the conveyor 7 is advanced one step.

The next conveying member 16 carrying said casting is fed into the cooling chamber 8 and is cooled in accordance with the above-described method according to the invention. This cooled casting is discharged from the cooling chamber 8 and removed from the conveyor 7 at the position where the conveyor 7 passes from the upper running range to the lower running range.

When the mold components 4 are drawn together and combined, the bottom plate 5 automatically enters the inside of the outer covering member 17 of the conveying member 16 by the action of the mold components, allowing casting work to be performed with high precision. .

Furthermore, the casting apparatus based on the present invention has a structure having a pair of mold support plates as shown in FIG. It can also be operated with.

Next, an experimental example will be explained regarding the process based on the present invention.

A case will be described in which a cylinder for a tractor engine is cast using an unpainted iron mold. The initial temperature of this mold is 50 to 60°C.

The temperature of the tears is maintained within the range of 1300 to 1310';
The skin was left in the mold until it reached a thickness of 2.5 m+. Thereafter, the casting was placed in a cooling chamber together with the bottom plate.

The temperature of the skin of this casting was 970℃ when the mold was opened.
Met. The temperature of the hot water, which had not yet solidified, was 1190°C.

The parameters of the process were kept constant except for the temperature of the cooling chamber.

First experimental example: The difference between the surface temperature of the casting and the temperature of the cooling chamber was 450°C.
The internal surface temperature of the cooling chamber was 520°C, and the temperature of the surface of the casting at the outlet of the cooling chamber was 1130°C.

The surface layer of this casting contained 10% ferrite, indicating that this value could not pass the product specifications. This is because the temperature of the surface of the partition of the cooling chamber is too high, causing deformation of the cast product.

Second Experimental Example The temperature difference between the surface of the casting and the inner wall of the cooling chamber was 500°C, the temperature of the inner wall of the cooling chamber was 470°C, and the temperature of the surface of the casting at the outlet of the cooling chamber was 1070°C. No cementite was formed (ie no chilling metal was used). The hardness of this casting was 210 to 215 on Brinell hardness.

Third experimental example: The temperature difference was 600°C, the temperature of the cooling chamber wall was 370°C,
The temperature of the casting at the outlet of the cooling chamber was 1050°C.

In this case, a trace amount of cementite was observed on the surface layer of the casting, and the hardness was 227 to 229 on Brinell hardness.

Fourth Experimental Example: The temperature difference was 650°C, the temperature of the cooling chamber wall was 320°C,
The temperature of the surface of the casting at the outlet of the cooling chamber was 1010°C. The cementite content in the surface layer of the casting was 6 to 7%. The Brinell hardness of the internal surface of this rust structure is 220 to 2.
23. The Brinell hardness of the external surface was 225 to 260, but this hardness makes machining difficult. The skin of this casting is often deformed as in the first experimental example, which significantly impedes machining (molten water usually overflows).In the fourth experimental example, the resulting cast The material is too hard to be machined.

It has been found that the hardness of the surface layer of the casting made using the casting apparatus according to the present invention is stable in the range of 210 to 240 on Brinell hardness. This value satisfies the standards for internal combustion-like cylinders and is also sufficiently easy to machine.

The casting does not shrink during solidification, so it does not generate internal stress, has a barley 1~95 to 97%, and does not contain any cementite. Since the surface layer of this casting is annealed to produce granulated graphite, the outer surface is difficult to cacig-ation.

The castings made by the casting method according to the present invention have a light gray main body part and a dark edge of the annealed surface layer.

[Brief explanation of the drawing]

Figure 1 is an elevational view of a gravity type mold casting apparatus having a pair of mold support plates, and Figure 2 is an elevational view of a gravity type mold casting apparatus having two pairs of mold support plates (one pair of mold support plates). 3 is a cross-sectional view of the casting device in FIG. 1 taken along the line ■-■, FIG. 4 is a cross-sectional view taken along the line ■-IV of the Vl casting device in FIG. 1, Fig. 5 is a cross-sectional view of the casting apparatus shown in Fig. 2 taken along the line v-■, Fig. 6 is a drawing showing two pairs of mold support plates in the neutral position, and Fig. 7 is a view of the mold support plates of Fig. 6. A plan view, FIG. 8 is a drawing showing a state in which one pair of mold support plates are combined on the bottom plate, and the other pair of mold support plates is separated, and FIG. 9 is a drawing showing the lines of the mold support plates, etc. in FIG. 8. It is a sectional view along rX-IX. DESCRIPTION OF SYMBOLS 1... Bed, 2... Grain injection device, 3... Mold support plate, 4... Mold component, 5... Bottom plate, 6... Core, 7... Vertical movement Beam type endless conveyor, 8...
Cooling chamber, 9゜10... Pair of mold support plates, 11...
・Gannon-shaped door, 12...Spring, 13...Surface, 1
4... Heating device, 15... Automatic temperature control device, 16
... Conveying member, 17... Outer cover member, 18... Internal space of outer cover member, 19... Annular protrusion, 20... Plate member, 21... Power cylinder, 22... ...Rod, 23...Claw, 24...Vertical rotation axis, 25...
Parallel tie rod, 26...Double dynamic power cylinder, 27...Rod, 28...Sleeve, 29.30
...2 pairs of levers, 31...tie rod. Applicant's agent Kiyo Inomata

Claims (1)

[Claims] 1. Inject hot water into a mold, hold the hot water in the mold until a skin of the casting is formed, take out the solidified casting from the mold, and pour the hot water into the mold. A method of iron casting in which the casting is cooled in a cooling chamber (8) provided with a surface (13) suitably blocking the dissipation of heat of the casting. A method for casting iron, characterized in that the temperature of the heat shielding surface (13) is maintained 500 to 600° C. lower than the temperature of the surface of the casting. 2. A bed (1), a mold support plate (3) having a component of the mold (4) and a drive mechanism for this mold component, and a core (
6), a conveyance mechanism for the bottom plate, and a cooling chamber (8) having a surface (13) that appropriately blocks heat radiation of the casting. The cooling chamber (8) has a passageway therethrough, in which is fitted a conventional heating device and an automatic temperature control device for maintaining the temperature within a preset range, said cooling chamber (8) having a mold support plate. (3), the mold support plate (3) is located above the mechanism for conveying the bottom plate, and the bottom plate conveying mechanism is a conveyor (7) consisting of a vertically moving beam;
The conveyor (7) is characterized in that it holds a jacket member (17) firmly fixed to the bottom plate (5), and the bottom plate (5) is attached to the jacket member so as to be movable in the radial direction. Gravity type casting equipment for die gas. 3. The gravity casting apparatus according to claim 2, wherein the mold support plate (3) is coupled to a component of the mold (4). 4. Two pairs (9, 10) of mold support plates (3) are connected to the bottom plate (
5) The components of the upper mold (4) are pulled together in the hot water injection area and the mold support plates (3) forming the pair (9, 10) are connected to the conveyor (7) consisting of the movable mold beam. The gravity casting device according to claim 2 or 3, wherein the gravity casting device is arranged at an angle of 45° to the axis on both sides of the device. 5. The driving mechanism of the mold support plate has a parallel link mechanism, which is connected to the mold support plate (3) and the bed (1), respectively, and the mold support plate drive mechanism is fixedly mounted vertically. This double-acting power cylinder (26) has two pairs of levers (29, 3).
0), and the pair of levers (29, 30) are supported symmetrically on the rod (27) of the double-acting power cylinder (26) along the separation line of the mold components of each pair. and is connected to the parallel link mechanism via a length-adjustable tie rod (31), and each of the pairs (29, 30)
5. The gravity type casting device according to claim 4, wherein the levers of the two levers protrude in opposite directions.