JPS6293056A - Product ejecting implement for die casting - Google Patents

Abstract

PURPOSE:To smooth the sliding of ejector pins and to stabilize and reduce the cycle time by passing cooling fluid through amid-way passage to the inside of the ejector pins thereby forcibly cooling plural pieces of the ejector pins. CONSTITUTION:Air flows through the inside of cooling pipes 5 for the ejector pins through the passage 20 and holes 17 and comes to the top end parts of the ejector pins 1 when the air is fed through a suction port 21 of a product ejecting implement for die casting. Since the top end parts contact the product, said parts are heated to a high temp. and therefore, the heated air is discharged from a discharge port 15 by passing the spacing between the inside surfaces of the holes provided in the ejector pins 1 and the outside surfaces of the cooling pipes. The ejector pins are forcibly cooled in the above-mentioned manner, by which the sliding of the ejector pins is made smooth.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for extruding products used in mold casting.

Conventional technology Conventionally, when casting aluminum wheels etc. using a low-pressure casting machine, compressed air is applied to the free surface of the molten aluminum held in a holding furnace, and the molten metal rises in the stoke, forming an upper mold and a lower mold. , is injected into the mold product part formed by three horizontal molds.

After casting, to remove the product, first open the horizontal mold while the lower mold remains fixed to the fixed platen of the low-pressure casting machine, and then slide the movable platen to which the upper mold is attached via the support. When raised, the product rises while attached to the upper die, and when it rises a predetermined distance, an extrusion pin fixed to an extrusion plate installed in the casting machine comes into contact with the product.
The product is extruded from the upper mold and removed.

In this case, the ejector pin slides in a bush hole provided in the upper mold, but conventionally the ejector pin was not cooled.

The problem that the invention aims to solve The mold temperature becomes extremely high in the areas where the molten metal comes into direct contact with the mold.

When extruding this part with an extrusion pin, phenomena such as seizure, erosion due to aluminum, adhesion of aluminum, and insertion of molten metal occur, and the extrusion pin slides. If the ejector pin does not move, the product will be deformed during extrusion, and the cycle time will be extended, the mold temperature will drop, and casting conditions will change due to variations in mold temperature, resulting in defects.

Means for Solving the Problems In order to solve the above problems, the present invention provides a longitudinal hole inside the push-out pin, and a cooling pipe having an outer diameter slightly smaller than the inner diameter of the hole. Insert the ejector pins, extrude and hold a plurality of extrusion pins, and temporarily attach the ejector pins.A cooling plate is installed on the extrusion holding plate via the extrusion plate, and the cooling pipes of the plurality of extrusion pins are connected from the inlet provided on the cooling plate. A passageway is formed in the cooling plate, the extrusion plate, and the extrusion holding plate, and the cooling fluid sucked in from the suction port is passed through the cooling pipe through the passageway, and further communicates with the inner surface of the hole provided inside the extrusion pin. A product extrusion tool for mold casting that allows the product to pass through the gap between the inner and outer surfaces of the pipe and discharge from a passage and outlet formed inside an extrusion holding plate that communicates with a discharge hole provided vertically inside a plurality of extrusion pins. It is.

Function: As mentioned above, the cooling fluid is sucked in through the suction port, passes through the inside of the ejector pin through the intermediate passage, and is discharged from the outlet through the intermediate passage, thereby forcing the plurality of extruder pins. Can be cooled.

Example Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 are a front view and a side view, respectively, showing the structure of the ejecting pin of the product extrusion device for mold casting, and Figure 3 is a sectional view of the main parts showing the installation state of the product extrusion device for mold casting. , FIG. 4 is a plan view of FIG. 3.

In FIGS. 1 and 2, a screw hole 2 and a hole 3 are provided in the longitudinal direction of the push-out pin 1.

Further, a discharge port 4 is provided at the end of the extrusion pin 1, passing through the screw hole 2 perpendicularly. A threaded nut 6 having the same inner diameter as the cooling pipe 5 is brazed to the tip of a steel cooling pipe 5 having an outer diameter slightly smaller than the inner diameter of the hole 3, and the threaded portion of the threaded nut 6 is inserted into the threaded hole. 2 and insert the cooling pipe 5 into the hole 2. When air is introduced through the inlet 1a of the push-out pin, the air passes through the inside of the cooling pipe 5, passes through the gap between the inner surface of the hole 3 and the outer surface of the cooling pipe 5, and is discharged from the outlet 4. The material of the extrusion pin is 8K.
The surface is coated with ion nitride O61.

In FIGS. 3 and 4, 7 is an upper mold, 8 is a bushing fitted into the upper mold, 9 is a lower mold, 10 is a horizontal mold, and 11 is a product. A plurality of extrusion pins 1 with cooling pipes 5 inserted therein are attached by making holes in the extrusion holding plate 12. Note that the extrusion plate 12 has a passage 13 that communicates with the outlet 4 of the extrusion pin 1.
A plurality of passages 13 are provided, and the passages 13 are connected to a discharge passage 15 via a ring-shaped passage 14 provided in the extrusion plate 12.

Attach the extrusion holding plate 12 to the extrusion plate 16, and press the extrusion plate 1
6 is fitted with an extrusion pin holding piece 18 having a hole 17 having the same inner diameter as the cooling pipe 5. A cooling plate 19 is mounted on the extrusion plate 16, and a ring-shaped passage 20 is hollowed out at the bottom of the cooling plate 19, and the passage 20 communicates with the hole 17 of the extrusion pin holding piece 18. Rough cooling plate 1
9 is provided with an inlet 21 communicating with the passage 20.

Suction port 21 of product extrusion device for mold casting with the above configuration
When more air is introduced, the air passes through the passage 20° hole 17, passes through the cooling pipe 5 of the ejector pin 1, and comes to the tip of the ejector pin 1, but this tip comes into contact with the product and becomes hot. Therefore, the heated air passes through the gap between the inner surface of the hole 3 provided inside the push-out pin 1 and the outer surface of the cooling pipe 5, passes through the outlet 41, the passage 131, and the passage 14, and is discharged from the outlet 15. Ru.

As described above, enter air from one intake port and
The ejector pin can be forcibly cooled by letting it out through the outlet at several locations.

Note that although air is used as the cooling medium in the explanation, a liquid such as water may also be used. Liquid has a greater cooling effect than air, but care must be taken as there is a risk of explosion if it leaks and comes into contact with molten metal.

Effects of the Invention As described above, according to the present invention, several ejector pins can be forcibly cooled, so the ejector pins slide smoothly, the cycle time is stable and shortened, and maintenance is facilitated. Man-hours are reduced, and casting defects are further reduced.

The present invention can be applied to areas where the mold temperature is locally high, areas that need to be cooled to prevent defects such as sinkholes, areas where molten metal comes into direct contact and causes aluminum insertion, aluminum adhesion, seizure, etc. Effective.

[Brief explanation of drawings]

Figures 1 and 2 are a front view and a side view, respectively, showing the structure of the ejector pin of the product extrusion device for mold casting, and Figure 3 is a cross section of the main part showing the installation state of the product extrusion device for mold casting. FIG. 4 is a plan view of FIG. 3. 1... Push-out pin, 3.17... Hole, 4.15...
・Exhaust port, 5... Cooling pipe, 12... Extrusion holding plate, 13.14.20... Passage, 16... Extrusion plate, 1... Cooling plate, 21... Inlet .

Claims (1)

[Claims] A hole is provided in the longitudinal direction inside the extrusion pin, a cooling pipe having an outer diameter slightly smaller than the inner diameter of the hole is inserted into the hole, a plurality of the extrusion pins are attached to an extrusion holding plate, and the extrusion pin is mounted on the extrusion holding plate. A cooling plate is attached via an extrusion plate, and a passage is formed in the cooling plate, the extrusion plate, and the extrusion holding plate to communicate with the cooling pipes in the plurality of extrusion pins from the inlet provided on the cooling plate, and the inlet is connected to the extrusion plate. The cooling fluid sucked in is passed through the inside of the cooling pipe through the passage, and further passed through the gap between the inner surface of the hole provided inside the ejector pin and the outer surface of the cooling pipe, and is then passed through the inside of the plurality of ejector pins in a vertical direction. A device for extruding a product for mold casting, characterized in that the product is discharged through a passage and a discharge port formed inside an extrusion holding plate that communicates with a discharge port provided in the extrusion holding plate.