JPH024388B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves forming a product cavity between an upper mold and a lower mold, and injecting molten metal in an injection sleeve provided at the lower part of the cavity into the cavity with an injection plunger. The present invention relates to a vertical casting device that pressurizes and fills the liquid.

(Prior technology) Molten metal is stored in a vertically installed injection sleeve, and the molten metal is pressurized and filled into the product cavity formed between the upper and lower molds that communicate with the injection sleeve, and is solidified under pressure to produce a cast product. The vertical die-casting machine obtained is often used for casting aluminum alloys (hereinafter referred to as Al alloys).

The quality of cast products molded with such casting equipment is determined by
Pressure force of molten metal, pressurization filling timing, pressurization time,
The factors include setting and controlling the mold temperature, but the most important factor is the supply of molten metal.

In other words, the molten metal heated to 800°C to 1000°C is supplied from the furnace into the product cavity, and during the filling process, an oxide film or a coagulated film is generated on the surface of the molten metal due to contact with air, which causes the inside of the product to form. This may cause faults to occur due to the incorporation of the film into the structure of the product, thereby reducing the strength and toughness of the product and causing defective products.

By the way, as a conventional vertical casting machine,
No. 47567 discloses this technology, in which an injection sleeve fitted with an injection plunger is installed vertically in a lower mold, while an atmosphere communication port is provided in the upper mold to communicate with a cavity that can be closed with a closing member. It was set up,
Molten metal is supplied into the injection sleeve from a molten metal sleeve provided on one side of the upper end of the injection sleeve.

(Technical Problems to be Solved by the Invention) In the above conventional technology, the injection sleeve is arranged vertically, while the molten metal sleeve is almost horizontal, although it is slightly sloped toward the injection sleeve, and therefore the injection sleeve is disposed vertically. The angles formed by the respective axes of the hot water supply sleeve are close to right angles. Therefore, when the molten metal is supplied from the hot water supply sleeve to the injection sleeve, it falls from above onto the injection plunger that forms the bottom plug in the injection sleeve, and the molten metal is stirred and removed from the oxide film and solidification on the surface. If the membrane becomes mixed inside, the above-mentioned problem occurs.

The present invention has been made in view of the above, and its purpose is to quietly and smoothly supply molten metal to the injection sleeve, and to prevent the oxide film and coagulation film generated on the surface of the molten metal from being absorbed into the molten metal. To provide a vertical casting device that prevents the above-mentioned film and air from being entrained in the structure of the obtained product, and is capable of obtaining a good quality cast product with few casting defects. There is something to do.

(Means for Solving the Problems) A means for solving the above technical problems is to arrange an injection sleeve on the lower mold on the die plate, and to form the injection sleeve between the upper mold and the lower mold. In a vertical casting device, the molten metal in the injection sleeve is filled from the upper end opening into the product cavity located laterally from directly above the product cavity. The injection sleeve is fixed to a die plate while being tilted from a vertical position, and a hot water supply sleeve for supplying molten metal from a ladle to the injection sleeve is fixed to the lower die of the upper part of the injection sleeve on the inclined side of the injection sleeve. , the supply port side of the hot water supply sleeve is tilted downward in the direction of the axis of the injection sleeve, and the lower end of the supply port of the hot water supply sleeve is brought into contact with the opening end of the injection sleeve, so that the bottom of the hot water supply sleeve and the inner wall of the injection sleeve are brought into contact with each other. It is a continuous combination of .

(Operation by the above means) According to the above means, the upper part of the injection sleeve is inclined, while the supply port side of the hot water supply sleeve is inclined downward in the axial direction of the injection sleeve, and the lower end of the supply port of the hot water supply sleeve is the opening of the injection sleeve. Since the bottom of the hot water supply sleeve and the inner wall of the injection sleeve are connected continuously, the hot water supplied from the hot water supply sleeve to the injection sleeve is transmitted from the bottom of the sleeve to the inner wall of the injection sleeve and quietly enters the injection sleeve. It will be supplied to

(Embodiments) Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, in which 1 indicates a die plate supporting a lower mold 2;
The upper mold 3 faces the lower mold 2, and the upper and lower molds 3, 2 are configured to be openable and closable, and the mold mating surface 3 of the upper and lower molds 3, 2
Concave portions 3b and 2b, which constitute the product cavity 4 in the mold closed state, are provided in opposing portions a and 2a.

An injection sleeve 5 is installed vertically in the lower mold 2 so as to pass vertically through the lower part of the lower mold 2 and the die plate 1, and the flange portion 5a at the upper end of the injection sleeve 5 is inserted into the recess 2c provided in a part of the bottom of the lower mold 2. The sleeve 5 is fitted into the vertical hole 1a of the die plate 1 and extends downward, the flange portion 5a engages with the periphery of the hole 1a, and the sleeve 5 is restricted in the vertical direction. sleeve 5
A part of the upper lower mold 2 is provided with a runner 6 that communicates with the corner 2d of the recess 2b of the lower mold forming the cavity 4, and the ceiling of the runner 6 is connected to the corner of the recess 3b of the upper mold 3. It is closed by part 3c. A tip 7a of an injection plunger 7 is disposed within the injection sleeve 5 communicating with the runner 6.
are slidably fitted, and the chip 7a is moved up and down within the sleeve 5 by a cylinder unit (not shown) or the like.

The axis center N ₁ −N ₁ of the above injection sleeve is the perpendicular line N −
The hot water supply sleeve 8 is disposed so as to be inclined by θ toward the outer hot water supply sleeve 8 side opposite to the cavity 4 with respect to N, so that the sleeve 8 is inclined and opens into the lower mold 2.

In the lower mold 2, a supply port 8a faces a part of the upper end opening of the injection sleeve 5, and a hot water supply sleeve 8 is provided horizontally so as to face the axis of the injection sleeve, and in the figure, the hot water supply sleeve 8 is tilted forward and downward. The base of the hot water supply sleeve 8 is fitted into a horizontal hole 2e provided diagonally to connect the lower part of the runner 6 and the outer wall, and is mounted and supported on the outer wall 2f by a mounting flange 8b provided around the middle part. is provided with a hopper 9 that opens upward, and a tip 10a of a seal plunger 10 is slidably fitted upstream of a communication opening 9a of the hopper 9, and 11 is a cylinder unit (not shown) for driving the seal plunger 10. It is a mounting bar, and also 12
is a ladle for collecting molten metal.

In the above process, the molten metal is poured into the hot water supply sleeve 8 from the ladle 12 via the hopper 9, the molten metal flows into the injection sleeve 5 from the supply port 8a, and the tip 7a faces the lower part of the sleeve 5, and the tip 7a faces the bottom of the sleeve 5. block the
The molten metal is stored within the inner diameter of the sleeve 5 above the chip 7a.

By the way, in the present invention, the injection sleeve 5 is provided in an inclined manner as described above, and the molten metal flowing into the injection sleeve 5 from the bottom 8c of the supply port 8a is formed so that the inner wall 5b on this side is oblique and the bottom 8c is The continuous part A of the inner wall 5b has an obtuse angle that is more than a right angle, so the molten metal flows from the continuous part A to the continuous inner wall 5 diagonally downward in the obtuse angle direction.
b is fed onto the flange tip 7a much more gently than the vertical wall. Therefore, the molten metal is quietly supplied into the sleeve 5 along the wall, and is supplied from the corner and stored, and as the liquid level rises, the liquid level is stirred or disturbed.
It is possible to suppress turbulence as much as possible, and therefore to prevent oxide films and coagulated films floating on the surface from being mixed into the molten metal. Since these films are filled into the cavity 4 while floating on the surface, these films appear on the outer surface of the product and are less likely to penetrate into the internal tissue, making it possible for faults to occur due to the inclusion of the film. This will lead to effective suppression and prevention. In addition, since the molten metal is quietly supplied into the sleeve 5 along the wall, there is no turbulence unlike in the case of conventional vertical walls, and there is less air entrainment due to this, resulting in the occurrence of blowholes etc. This will also be suppressed and prevented as much as possible.

FIG. 1 shows the state of completion of hot water supply. After that, the seal plunger 10 is moved forward, the tip 10a closes the supply port 8a of the hot water supply sleeve 8, and then the injection plunger 7 is moved upward to push up the molten metal M and into the product cavity 4. After filling, the plunger 7 is moved upward to apply pressure, and after solidification, the mold is opened and the product is taken out. By the way, the molten metal is pushed up from the bottom and filled into the cavity, and the filling is carried out quietly and smoothly to every corner of the cavity, and the filling is performed without entrainment of air or shrinkage.

FIG. 2 shows a second embodiment. In this embodiment, an injection sleeve 113 is provided so as to open at the ceiling of the corner 3c of the upper mold 3, and a hot water supply sleeve 108 is provided in the upper mold 3, and the lower mold is slanted. Molten metal is supplied from the hot water supply sleeve 108 into the injection sleeve 5 provided at No. 2, and the seal plunger 110 fitted in the injection sleeve 113 is moved downward to close and seal the hot water supply port of the hot water supply sleeve 108. Since the other configurations are the same as those described above, the same parts are given the same reference numerals and the explanation will be omitted.

(Effects of the Invention) As is clear from the above, according to the present invention, hot water can be quietly and smoothly supplied into the injection sleeve.
By suppressing the oxide film, coagulation film, and even air entrainment as much as possible, it is possible to obtain a cast product of good quality with few casting defects, and this also improves the yield. It has many advantages such as being able to accomplish the above with a simple configuration.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a longitudinal sectional view of the first embodiment, and FIG. 2 is a similar view of the second embodiment. In the drawings, 1 is a die plate, 2 is a lower mold, 3 is an upper mold, 4 is a cavity, 5 is an injection sleeve, and 8 is a hot water supply sleeve.

Claims (1)

[Scope of Claims] 1. An injection sleeve is disposed in a lower die on a die plate, and a product cavity is formed between the upper die and the lower die and is located above the injection sleeve and laterally shifted from directly above the injection sleeve. In the vertical casting apparatus, the injection sleeve is filled with molten metal from its upper end opening, and the upper part of the injection sleeve is tilted from a vertical position in a direction opposite to the product cavity, and the injection sleeve is attached to a die plate. A hot water supply sleeve for supplying molten metal from a ladle to the injection sleeve is fixed to the lower mold of the upper part of the injection sleeve on the inclined side of the injection sleeve, and the supply port side of the hot water supply sleeve is aligned with the axis of the injection sleeve. A vertical casting characterized in that the bottom of the hot water supply sleeve and the inner wall of the injection sleeve are continuously connected by tilting the hot water supply sleeve downward and bringing the lower end of the supply port of the hot water supply sleeve into contact with the opening end of the injection sleeve. Device.