JPH032359Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of gate opening and closing for reliably and smoothly supplying molten metal into a cavity in rigid casting.

In this invention, a plunger tip that moves up and down from above is fitted via a rod into a sleeve that extends downward and faces a gate that communicates with a cavity formed by clamping an upper mold and a lower mold. The molten metal inserted into the sleeve is allowed to flow into the cavity by gravity by opening the gate, and then the molten metal is further filled into the cavity under pressure by the downward movement of the plunger tip, This invention relates to a rigid pressure casting machine for precision casting of aluminum alloy products, etc., and in particular, the above-mentioned sleeve is directly connected to an upper fixed sleeve and the lower fixed sleeve, and has a counter tip. First, the gate can be opened at the lower end, and an upper fixed sleeve and a lower straight cylindrical movable sleeve are installed above and below to form a movable space for the movable sleeve at a set position within the upper mold. A driving device linked to the movement of the plunger tip is connected to the movable sleeve and moves it upward to open the lower gate, so that the molten metal of the plunger tip is pressurized within the movable sleeve. This is a device related to a rigid pressure casting machine.

<Prior art> As is well known, there are many types of cast products, but among them, for example, castings made of light alloys such as aluminum alloys are generally die cast, and also by rigid pressure casting. It was being produced.

However, the following problems arose in terms of quality and productivity improvement.

<Problems to be solved by the invention> In other words, in the case of die-casting, the molten metal is forced in at high speed, so gas is likely to be trapped in the inflow path such as a gate or inside the cavity, which results in poor product quality. It had the disadvantage of being less reliable.

In addition, in the case of rigid pressure casting, as shown in FIG. A plunger tip 8 and a counter tip 9, which are connected to the respective hydraulic cylinders 6 and 7, are fitted into the upper and lower parts of the plunger sleeve 5 so as to be able to move up and down, and are connected to the plunger sleeve 5 at the middle and are installed obliquely. Hot water sleeve 1
A rigid pressure casting apparatus 13 in which molten metal 12 is poured into a plunger sleeve 5 from a ladle 11 from 0 is generally used.

When casting aluminum alloy or the like using the molten metal 12 using the seed-hard type pressure casting device 13, as shown in FIG. As shown in FIG. 2b, the counter tip 9 is lowered by the hydraulic cylinder 7 to open the gates 4, 4. Therefore, as shown in FIG. The entire molten metal 12 falls within the plunger sleeve 5, and the drop causes turbulent flow within the gates 4, 4, and gas entrainment occurs in the inflow passage and cavity 3, resulting in the formation of so-called cavities and quality problems. It had the disadvantage that it could become defective, making it impossible to produce a sound cast product.

To deal with this, for example, the lower plunger sleeve is moved downward relative to the upper plunger sleeve to open the gate, as seen in the invention of Japanese Patent Application Laid-Open No. 57-32867, which is an earlier invention of the applicant. A vertical pressure casting device has also been devised in which the molten metal is supplied into the cavity through the gate. From the time the gate is initially opened to when it is fully opened, the molten metal flows into the cavity in a spiral manner, falling to the bottom surface of the gate from the opening gap at the top, and is poured into the cavity. There is a problem that it is easy to get caught in the hot water or cause hot spots to occur.
Also, like the above-mentioned rigid pressure casting apparatus, there is a disadvantage that the structure of the lower mold is large and complicated.

In the prior invention, since the counter chip is provided in the plunger sleeve of the lower mold, there is a problem similar to that described above, and furthermore, the operation control with the plunger sleeve of the lower mold is complicated. I felt inconvenienced.

The purpose of this invention is to solve the technical problem of opening and closing the gate communicating with the cavity based on the above-mentioned conventional technology, and to provide a lower movable sleeve without a counter tip at the lower part of the upper fixed plunger sleeve. The opening/closing operation of the gate, which is formed in a straight cylinder shape and communicates with the cavity at the lower end, is made smooth by the upward movement of the movable sleeve of the lower mold, preventing molten metal from falling during pouring, preventing gas entrainment in the cavity, and improving reliability. It is an object of the present invention to provide an excellent rigid pressure casting apparatus that can cast high-quality products with good quality, thereby benefiting the field of application of casting technology in the machine manufacturing industry.

<Means for solving the problem> In line with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problems by using a gate of a cavity formed by an upper mold and a lower mold. A plunger tip is fitted into the upper fixed sleeve of the sleeve that is divided and extends downward, and the lower movable sleeve, which is connected to the upper fixed sleeve, is a lifting drive that allows the gate to be opened and closed. The lower movable sleeve has an open end with respect to the gate at the lower end, does not have a counter tip, and has a plunger tip that is slidable to cast the molten metal. A movable space for raising the movable sleeve is formed in the upper mold, and the movable sleeve is connected to a driving device linked to the movement of the plunger tip. It is said to be a rigid pressure casting equipment.

<Operation> The upper mold and lower mold are clamped together to form a cavity.
It is directly connected to the fixed sleeve of the upper die which is provided at the lower part of the fixed sleeve of the upper die and is connected to the drive device, and the gate is opened and closed at its lower end through the straight cylindrical movable sleeve of the lower die which does not have a counter tip. The gate communicating with the cavity is shut off at the lower end, the plunger tip is raised by a set amount, and molten metal is poured into the fixed sleeve.The plunger tip is then lowered, and at the predetermined lowered position, the molten metal is poured into the fixed sleeve. Then, the movable sleeve of the lower mold is raised, and the gate is smoothly opened upward from the bottom at the lower end, and the molten metal is allowed to flow into the cavity via gravity without falling phenomenon, and the gravitational flow of the molten metal is stopped. Before the upper plunger tip catches up with the upper surface of the molten metal in the movable sleeve, the plunger tip pressurizes the molten metal into the cavity over the lower part of the movable sleeve, quietly and continuously pouring the molten metal into the cavity. Prevents gas entrainment inside,
Technical measures have been taken to obtain a high-quality, healthy cast product that does not have cavities or the like.

<Example> Next, an example of this invention will be described below based on the drawings from FIG. 3 onwards.

Note that the same parts as in FIG. 1 will be explained using the same reference numerals.

In the embodiment shown in FIG. 3, 13' is a rigid pressure casting device that forms the gist of this invention, in which an upper mold 1 and a lower mold 2 are clamped to form cavities 3, 3. The gates 4, 4 communicating with the cavities 3, 3 are connected to a ring-shaped hydraulic drive device which is placed and fixed at the center of the lower surface of a movable space 14 formed at an intermediate position between the upper mold 1 and the lower mold 2. A lower movable sleeve 19 has a flange portion 18 clamped and fixed to the upper part of the rod 17 of the ring-shaped piston 16 of the cylinder 15.
As the movable sleeve 19 rises, the lower end of the movable sleeve 19 can be opened.

The lower movable sleeve 19 is not equipped with a counter tip as in the conventional embodiment shown in FIG.

Further, an inclined pouring sleeve 10 is connected to the lower part of the upper mold 1 above the lower movable sleeve 19, and a rod 2 is connected to the upper hydraulic cylinder 6.
A plunger sleeve 5 is fixedly provided as a fixed sleeve into which a plunger tip 8 connected via a pin 8 is fitted so as to be movable up and down.

At the set position of the rod 20 of the hydraulic cylinder 6, there is attached a dowel 24 that comes into contact with and separates from a limit switch 22 provided in a predetermined control device 21, and a ring-shaped hydraulic cylinder 15 is attached to the control device 21. An electromagnetic switching valve 29 is connected to the upper and lower ports 25 and 26 and connects a pressure oil tank 28 via a hydraulic pump 27, and the plunger tip 8 is connected to the movable sleeve 19.
Before reaching the top surface of the molten metal 12 inside, the electromagnetic switching valve 2
9 switchings are made.

Molten metal 12 is poured from the upper pouring port 30 of the inclined pouring sleeve 10 into the lower movable sleeve 19 via the plunger sleeve 5 by the ladle 11.

In the rigid pressure casting apparatus 13' having the above-mentioned structure, as shown in FIG. The lower movable sleeve 19 connected to the electromagnetic switching valve 29 is moved downward to close the gates 4, 4 of the cavities 3, 3, and the plunger tip 8 is set to the initial position by the hydraulic cylinder 6.

Therefore, when a set amount of molten metal 12 is poured into the plunger sleeve 5 using the ladle 11 through the pouring port 30, the molten metal 12 is directly stored in the lower movable sleeve 19 on the lower mold 2, and this state The hydraulic cylinder 6 is operated to lower the plunger tip 8 at a set speed.

Then, at a predetermined timing before the plunger tip 8 reaches the upper surface of the molten metal 12 in the lower movable sleeve 19, the dog 24 attached to the rod 20 is released.
comes into contact with the limit switch 22, and the control device 21
At the same time, the electromagnetic switching valve 29 is switched to the mode shown on the left side a in the figure, and the hydraulic pump 27 is activated, and the piston 16 is pressurized upward through the lower port 26 of the ring-shaped hydraulic cylinder 15 and rises. At the same time, the movable sleeve 19, which is fixed to the upper part of the rod 17 of the piston 16 with the flange 18 held therebetween, also rises smoothly at the same time, and the gate 4,
4 is opened, and the molten metal 12 begins to flow into the cavities 3, 3 from the gates 4, 4 by gravity.

In this process, since the lower movable sleeve 19 does not move downward as in the conventional embodiment, the molten metal 12 inside does not fall and flows smoothly into the cavity 3, without causing turbulence or gas entrainment.

Then, the descending plunger tip 8 reaches the upper surface of the molten metal 12, and the molten metal 12 is forcibly filled into the cavities 3, 3 by its pressurization.

After a predetermined period of time has elapsed, the upper mold 1 and the lower mold 2 are opened, and the cast product (not shown) in the cavities 3, 3 is taken out.

It should be noted that the operation after the lower end gates 4, 4 are opened through the raising of the movable sleeve 19 by the limit switch 22 and dog 24 may be any operation that is linked to the movement of the plunger tip 8, for example,
This is also possible with a timer.

In this embodiment, as described above, even though the lower movable sleeve 19 is not provided with a counter tip, the turbulence and gas entrainment of the molten metal 12 described above do not occur, and the molten metal 12 can be moved smoothly. flows into the cavity 3, and a sound product is cast.

Further, the embodiments shown in Figs. 4 and 5 show other embodiments, and are used in a mold in which only one cavity 3 on one side is formed by clamping an upper mold 1' and a lower mold 2'. It is a rigid pressure cast 13'' which is connected to the lower part of the plunger sleeve 5' which is connected to the pouring sleeve 10 fixed to the upper part of the upper mold 1'. has a lower plunger sleeve 31 fixed to the lower part of the plunger sleeve 5', and the lower plunger sleeve 31 has a portion opposite to the gate 4 at the lower end communicating with the cavity 3 divided and formed at the lower part of the plunger sleeve 5'. A split-type lower movable sleeve 19' that moves up and down between the sliding slit portions 32 is interposed, and the flange portion 18' of the lower movable sleeve 19' is connected to the rod 1 of the hydraulic cylinder 15'.
In this embodiment, the movable sleeve 19' is moved upward by switching an electromagnetic switching valve 29 fixed to the upper side of the sleeve 7', and the gate 4 at the lower end is opened.

Furthermore, FIGS. 6, 7, and 8 show another embodiment, in which the lower movable sleeve 19' of the split type in the other embodiments shown in FIGS. 4 and 5 is replaced with a hydraulic mechanism and a link mechanism is used. A rigid pressurized casting device 13 is mechanically moved upward through the device to open the gate 4 at the lower end.
In this embodiment, the rod 20' connected to the plunger tip 8 is formed with a stepped portion 33 at its setting position so that the diameter of the rod on the side of the hydraulic cylinder 6 is made larger than the diameter of the rod on the side of the plunger tip 8. When the tip 8 descends and reaches just before the top surface of the molten metal 12, it is supported by a pin on the cover of the upper mold 1', and the roller 35 is supported by a pin at the tip.
As shown in FIG. 8, the link 37 that rotates within the bored slit portion 36 of the fixed side plunger sleeve 5'' comes into contact with the upper large diameter rod 20' and rotates downward. The flange portion 1 is attached to the flange portion 18′ of the movable sleeve 19′, which is split into the rear portion, through a bar 38 of a set length that is pivotally supported on both sides by pins.
8', the lower movable sleeve 19' is raised to the sliding slit part 32 formed at the lower part of the plunger sleeve 5'', and the lower gate 4 is opened. This is what I did.

Furthermore, the embodiment shown in FIG. 9 shows still another embodiment, in which the plunger sleeve 5 into which the plunger tip 8 is fitted so as to be able to move up and down is extended down to the gates 4, 4 at the lower end. It is fixed to the mold 1, and has the same structure as the embodiment shown in FIG. 5 and the lower movable sleeve 19 is placed on the lower part thereof, the movable sleeve 19 can be smoothly raised and lowered by the ring-shaped hydraulic cylinder 15, etc., without being influenced by the heat of the molten metal. The gates 4, 4 at the lower end are opened and closed by moving the gates.

It should be noted that the embodiments of this invention are of course not limited to the above-mentioned embodiments. For example, a movable sleeve having the same diameter as the plunger sleeve provided below the plunger sleeve fixed to the upper part of the upper mold,
Alternatively, various embodiments may be adopted, such as a movable sleeve that is sheathed at the bottom of the plunger sleeve that extends down to the gate at the lower end, and is mechanically moved upward by a link mechanism that is linked to a rod that is connected to the plunger tip. It is possible.

<Effects of the Invention> According to the invention described above, an excellent effect is achieved in which basically high-quality, defect-free and sound cast products can be manufactured with high reliability.

The lower straight cylindrical movable sleeve, which has no counter tip and is directly connected to the upper fixed sleeve, is connected to a drive device linked to the rod of the plunger tip to open the gate at the lower end communicating with the cavity. Since this is carried out by an upward motion, there is no need for the molten metal to fall into the gate due to the lowering of the movable sleeve as in the conventional method, and the gate is opened at the lower end of the movable sleeve to allow the molten metal to flow smoothly into the cavity. This has the effect of eliminating molten metal turbulence, gas entrainment, and melt boundaries in gates and cavities, and producing sound cast products without defects such as cavities.

Since the lower straight cylindrical movable sleeve, which is directly connected to the upper fixed sleeve, does not have a counter tip, the molten metal introduced into the upper fixed sleeve is immediately stored in the lower movable sleeve. When the movable sleeve is pulled up into the upper space and the gate at the lower end is opened, the molten metal in the lower movable sleeve flows smoothly into the cavity through the gate by gravity without having a drop. However, in this case, as mentioned above, because the counter tip is not provided in the movable sleeve, and after the plunger tip reaches the molten metal in the movable sleeve by descending, the molten metal is pressurized inside the movable sleeve as well. The molten metal flows into the cavity without turbulence in the molten metal or gas entrainment, resulting in the excellent effect of producing a cast product that is sound and as designed.

In addition, since the lower mold does not require an attached device such as a counter chip or its hydraulic cylinder, the structure of the lower mold is simplified and the manufacturing cost of the entire mold can be significantly reduced. be done.

In addition, since the lower mold does not require an attached device such as a counter chip or its hydraulic cylinder, the structure of the lower mold is simplified and the manufacturing cost of the entire mold can be significantly reduced. be done.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a rigid pressure casting apparatus based on the prior art, FIGS. 2a and 2b are partially enlarged sectional views of FIG. 1, and FIGS. FIG. 3 is a sectional view corresponding to FIG. 1 of one embodiment,
Figures 4 and 5 are explanatory diagrams of other embodiments, where Figure 4 is a sectional view equivalent to Figure 1, Figure 5 is a plan view of the same lower plunger sleeve, and Figures 6, 7, and 8 are other embodiments. FIG. 6 is a sectional view equivalent to FIG. 1, FIG. 7 is a plan view equivalent to FIG. 5, FIG. 8 is a partially sectional side view of the operation of the link, and FIG. FIG. 2 is a sectional view corresponding to FIG. 1 of the embodiment. 1, 1'... Upper mold, 2, 2'... Lower mold, 3... Cavity, 4... Gate, 5, 5', 5'', 5...
... Fixed sleeve, 8 ... Plunger tip, 1
3', 13'', 13, 13'''''... Rigid pressure casting device, 14, 14'... Movable space, 15, 15',
37... Drive device, 19, 19'... Lower movable sleeve.

Claims (1)

[Scope of utility model registration request] A plunger tip is fitted into the upper fixed sleeve of the sleeve, which faces the gate of the cavity formed by the upper mold and the lower mold, and which is divided and extends downward, and is connected to the upper fixed sleeve. In a rigid pressure casting machine in which the movable sleeve on the side is linked to a lifting drive device that allows the gate to be freely opened and closed, the movable sleeve on the lower side has an open end relative to the gate at the lower end and allows the plunger tip to slide freely. The movable sleeve is formed into a straight cylindrical shape in which pressure is applied to the molten metal, and a movable space for raising the movable sleeve is formed in the upper mold, so that the movable sleeve is linked to the movement of the plunger tip. A rigid pressure casting device, characterized in that it is connected to a drive device.