JPH0224516Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cold chamber type die casting machine, and more particularly to a cold chamber type die casting machine in which molten metal can be supplied directly from a sleeve into a cavity.

Conventional cold chamber die casting machines press the molten metal supplied into the sleeve into the cavity formed between the movable mold and the fixed mold through a runner formed in the fixed mold by a piston. was configured to do so. Therefore, there is a disadvantage that a relatively high proportion of the molten metal solidifies in the wasted runners, resulting in a large loss of molten metal and melting energy. Furthermore, since the molten metal is press-fitted from one end of the cavity, there are disadvantages in that the circulation of the molten metal is poor and cavities are likely to form, resulting in a high incidence of defective products.

In view of the above-mentioned conventional drawbacks, the present invention aims to minimize wastage of molten metal, reduce melting energy when making molten metal, and press-fit molten metal from approximately the center of the cavity. To obtain a cold chamber type die casting machine which improves the circulation of hot water in a cavity, reduces the occurrence of defective products, and enables die casting even with a small mold clamping force.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 3, 1 is a mold mount. Reference numeral 2 denotes a fixed mold fixed to the mold mount 1, and the fixed mold 2 has a recess 3 forming a cavity, and a truncated cone-shaped pin gate 4 communicating with the approximate center of the recess 3. is formed. Reference numeral 5 denotes a mold support stand disposed at a position corresponding to the mold mount 1. One end of 6 is attached to the mold mount 1, and the other end is attached to the mold support 5.
There are multiple mold support bars attached to the mold support bar.

Reference numeral 7 denotes a movable mold that is movably attached to the plurality of mold support bars 6 and clamped to the fixed mold 2, and a portion of the movable mold 7 corresponding to the fixed mold 2 is provided with a mold. A protrusion 9 that enters into the recess 3 to form the cavity 8 during tightening, and a through hole 10 that passes through the protrusion 9 are formed. Reference numeral 11 denotes a support base that is movably attached to the plurality of mold support bars 6 and moves together with the movable mold 7. A pressure cylinder 13 such as a hydraulic pressure cylinder for moving the moving push-out pin 12 is attached.

Reference numeral 14 denotes a support leg fixed approximately at the center of the support base 11, and an operating rod 17 of a hydraulic cylinder 16 as a mold moving device 15 fixed to the device fixing portion is interlocked with the support leg 14. The support stand 11, the movable mold 7, etc. are moved by the operation of the hydraulic cylinder 16. 18
is a molten metal supply device that supplies molten metal into a cavity 8 that is formed when the fixed mold 2 and the movable mold 7 are clamped; Type 2 pin gate 4
A sleeve 19 is formed with a tapered hole 19a that communicates with the pin gate 4 and has a smaller diameter at a position closer to the pin gate 4.
, a hot water inlet 20 for supplying molten metal into the sleeve 19, a piston 21 that reciprocates within the sleeve 19, and a piston moving device 22 such as a hydraulic cylinder that reciprocates the piston 21. .

Reference numeral 23 denotes a stamp removing device for removing the stamp 24 solidified at the pin gate 4 portion, and the stamp removing device 23 includes a recessed portion 25 for firmly inserting the stamp 24 formed at the tip of the piston 21 into the piston 21. , a stamp drop-off hole 26 formed near the rear end of the sleeve 19, and a through-hole 2 of the sleeve 19 through which the stamp 24 pulled inside the sleeve 19 by the piston 21 drops.
7 and an extrusion device 29 such as a hydraulic cylinder having an extrusion rod 28 passing through the extrusion rod 28 .

In the above structure, the operating rod 17 of the mold moving device 15 is projected, and the movable mold 7 is brought into pressure contact with the fixed mold 2 to perform mold clamping, as shown in FIG. Thereafter, the molten metal is injected from the inlet 20 of the sleeve 19 of the molten metal supply device 18, and the piston moving device 22 is activated to cause the piston 21 to protrude, so that the molten metal injected into the sleeve 19 passes through the pin gate 4. Then, it is directly press-fitted into the cavity 8 formed by the movable mold 7 and the fixed mold 2. When the molten metal press-fitted into the cavity 8 solidifies, the operating rod 17 of the mold moving device 15 is contracted, and as shown in FIG. move away. Due to this movement, the product 30 solidified in the cavity 8 moves while being attached to the movable mold 7, so that the product 30 and the solidified stamp 24 are separated by the pin gate 4. Then, the mold moving device 15 moves to a predetermined position.
It is stopped at the point where the operating rod 17 is retracted. Thereafter, when the pressing cylinder 13 was operated to cause the ejecting pin 12 to protrude, the cast product 30 adhering to the periphery of the protruding piece 9 of the movable mold 7 was pushed out as shown in FIG. 3 and dropped to the lower part. After that, the push-out pin 12 is returned to its original position and its operation is stopped. At this time, the piston 21 also moves to the piston moving device 2.
2, the inside of the sleeve 19 with the stamp 24 attached is retreated to the position of the stamp removal hole 26, and at this position, the pushing device 29 of the stamp removing device 23 is operated to project the pushing rod 28 and the piston 21 After pushing the stamp 24 attached to the biting part 25 and dropping it to the lower part from the dropout hole 26, the pushing rod 28 is returned to its original position and its operation is stopped. After that, the piston moving device 22 operates to move the piston 21 into the sleeve 1.
It moves forward to a position where it closes the dropout hole 26 of No. 9 and stops.

After that, the mold moving device 15 is operated and the operating rod 17 projects, and the projection of the operating rod 17 presses the support base 11 and the movable mold 7 against the fixed mold 2.
The mold is in a clamped state as shown in FIG. In addition, since the tapered hole 19a is formed in the sleeve 19, even if the stamp 24 is attached to the piston 21, the piston 21 can be easily moved back. Further, when press-fitting the molten metal, the clearance between the piston 21 and the sleeve 19 is optimal at the location where pressure is applied to the molten metal being press-fitted into the cavity, so that the molten metal can be press-fitted in the same way as in the prior art.

Next, a different embodiment of the present invention shown in FIG. 4 will be explained. In the description of this embodiment, the same parts as those in the embodiment of the present invention will be denoted by the same reference numerals and redundant explanation will be omitted.

In the embodiment shown in FIG. 4, the main difference from the embodiment of the present invention is a sleeve 19, which has a straight portion 19b of a predetermined size on the pin gate 4 side.
A tapered hole 19a having a diameter is formed. Even if the sleeve is constructed in this way, the same effects as in the embodiments of the present invention can be obtained.

Note that the stamp 24 attached to the piston 21
After falling off from the piston 21, a shutter or the like may be used to automatically supply the melt to the melting furnace and melt it before the temperature drops, thereby preventing energy loss. Further, the adhesive between the piston and the stamp may have any shape as long as it can be easily removed by the pressing force of the pushing rod 28.

As is clear from the above explanation, the present invention has the following effects.

(1) Since the molten metal directly supplied into the sleeve from the pin gate can be press-fitted into the cavity, the molten metal can be efficiently press-fitted into the cavity.

(2) Since the molten metal is directly injected into the cavity through the pin gate, the molten metal does not solidify in the runner as in the conventional system, so the amount of unnecessary molten metal solidification can be reduced. Therefore, the molten metal can be used economically and energy waste can be prevented.

(3) Since a tapered hole is formed in the sleeve, the piston can be easily moved even when a stamp is attached, and molten metal can be press-fitted without causing molten metal leakage as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention;
2 and 3 are schematic explanatory diagrams showing the operating state of FIG. 1, and FIG. 4 is a schematic explanatory diagram showing a different embodiment of the present invention. 1... Mold mounting base, 2... Fixed mold, 3... Recess, 4... Pin gate, 5... Mold support base, 6...
... Mold support bar, 7 ... Movable mold, 8 ... Cavity, 9 ... Projection, 10 ... Through hole, 11 ... Support stand, 12 ... Push-out pin, 13 ... Pressing cylinder, 14 ... Support leg, 15 ... Mold moving device, 16 ... Hydraulic cylinder, 17 ... Operating rod,
18... Molten metal supply device, 19... Sleeve, 19
a... Taper hole, 20... Hot water inlet, 21...
Piston, 22... Piston moving device, 23...
Stamp removal device, 24... Stamp, 25...
Biting part, 26... Stamp dropout hole, 27...
Through hole, 28... extrusion rod, 29... extrusion device, 30... product, 31... sleeve moving device.

Claims (1)

[Scope of utility model registration request] A mold mounting base, a fixed mold fixed to the mold mounting base, a movable mold mounted on the fixed mold so that the mold can be clamped and opened, and a connection between the movable mold and the fixed mold. A cavity formed in between, a pin gate that directly supplies the molten metal into the cavity formed in the fixed mold, and a position near the pin gate part that is attached to the mold mount and directly connected to the pin gate has a small diameter. A molten metal supply device that supplies molten metal in a cavity having a sleeve with a tapered hole formed therein, and a stamp formed at the tip of a piston of this molten metal supply device is fixed so as to move within the sleeve by the piston. a stamp drop-off hole formed at a position near the rear end of the sleeve of the molten metal supply device; and a stamp extrusion device that drops the stamp pulled inside the sleeve by the piston from the stamp drop-off hole. A cold chamber die-casting machine comprising a stamp removal device for removing the stamp solidified at the pin gate section.