JPS606742B2 - casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a casting mold used for die casting.

Conventionally, it has been common practice to provide a gas vent through the cavity to exhaust the air inside the mold when press-fitting a Rakuyo in casting operations, but the cross-sectional area of the gas vent hole is large. If it is too large, the gas will escape easily, but it cannot be made large because it will cause the molten metal to blow out, and there are certain standards.Moreover, the passage surface of the secondary gas vent hole is usually made of parallel surfaces, so the cavity Although the molten metal ejected from the side under high pressure is at high speed, it flows in a laminar flow along parallel planes in the gas vent hole, and therefore the part of the outer periphery that comes into contact with the mold surface cools and solidifies. Not only does the part become a semi-fluid and scatter forward and the solidification distance is unstable, but after the surrounding area has solidified to a certain extent, the solidification film in some weak parts (parts where the solidification distance is short) is broken. Moreover, there were many problems in designing the gas vent hole because there was a concern that the subsequent molten metal would spout out only in this part, leading to an unexpected situation.Therefore, it was unavoidable to design the gas vent hole in this area for safety reasons. It was necessary to reduce the cross-sectional area of the gas vent hole or to increase the distance of the gas vent hole.However, if the cross-sectional area of the gas vent hole is made small, the gas cannot escape completely.
Increasing the distance of the gas vent hole increases the area of the die's split surface, which increases the chance of debris (such as chunks of falling sun) getting caught between the die's split surfaces, which can cause machine operation to be interrupted. (If you have to stop and carry out removal work, or leave it as it is)
If the operation is continued in an unreasonable manner, the molten metal may come out and cause various problems.

The present invention solves these problems by significantly shortening the distance between the gas vent holes and by reducing the supporting area of the dividing surfaces of the fixed die and the movable die, thereby eliminating the possibility of foreign matter getting caught. Therefore, it is possible to reduce the gap between the mating surfaces to 0, and the molten metal does not splash out from the gap, and the gas vent hole can be maximized, making it possible to use a large amount of molding agent, which is currently difficult to automate. This was invented for the purpose of providing a casting mold that eliminates the clogging of gas vent holes caused by mold and allows for easy production of stable products with few cavities. Hereinafter, referring to the drawings showing an example of implementation, 1' is a fixed mold, 2' is a fixed mold, and 2' is a fixed mold.
is a stationary side cavity that is recessed and provided at the center of the jaw of the stationary mold.

3, 3... are located outside the fixed side cavity 2, one end of the inside is compatible with the cavity 2, and the other end is tilted diagonally in the 45 direction and has a shallow U-shaped cross section. This is a gas vent slanted groove formed in the shape of a groove and having many parallel depressions.

4, one end is provided through the fixed side cavity 2, and the other end is provided facing outward, and in the middle thereof, a large number of the gas venting inclined grooves 3 are provided diagonally across and in parallel at predetermined intervals. This is the remaining surface on the same level as the mating surface A.

5 is the outer periphery of the gas venting inclined groove 3 and the surrounding green 6 of the fixed die.
This is a non-contact surface constructed by recessing the substantially fixed dividing surface between the two.

7 is a sprue provided through the fixed cavity 2;
is a scar created in communication with sprue 7.

9, 9...- are guide pins placed near the four corners of the fixed die.

Reference numeral 10 denotes a vacuum suction groove recessed at an outer position of the gas venting inclined groove 3.

The ear 1 is a vacuum suction hole through which one end of the vacuum suction groove 1 passes and the other end thereof is led out of the fixed mold 1. 12 is a movable mold, and 13 is a movable side cavity provided in a protruding manner at the center of the cheek of the movable mold.

14, the stove 4... is located at the outside position of the movable cavity 13, and one end of the inside is connected to the movable cavity stove 3,
The other end side is diagonally inclined in the 45° direction and has a shallow U-shaped cross section with a large number of parallel depressions for gas venting.

15 has one end that communicates with the movable cavity i3, and the other end that faces outward, and is the same as the mating surface A that is provided in parallel with the gas venting inclined grooves j4 diagonally intersecting many times in the middle. This is the remaining level surface.

Reference numeral 16 denotes a non-contact surface formed by recessing a diagonal-shaped flat portion between the outer peripheral portion of the gas venting inclined groove 14 and the gap 17 of the movable die 12.

18 is a sprue provided to communicate with the movable side cavity 13, and 19 is a mirror inlet provided in communication with the sprue 18.

Reference numerals 20, 20, . . . indicate pin holes drilled at positions corresponding to the guide pins 9, 9, . . . near the four corners of the movable die.

Is the present invention a fixed mold because it has such a configuration? and movable mold 1
When both molds 2 are fitted, the gas venting grooves 14 diagonally intersect with each other as shown in FIGS. 3 and 4, and there is a large space between the non-bush contact surface 5 and the non-saddle contact surface 16. Unlike the conventional method, the Rakuyo that is press-fitted by a cylinder (not shown) enters the cavity 2 through the sprue 7 and then blows out toward the gas venting inclined grooves 3 and 14, which diagonally intersect and oppose each other. While the molten metals that have entered into 3 and 14 respectively advance toward the exit side, their inner surfaces cross and collide with each other many times, and the collision parts cross each other diagonally in the direction of travel, acting in a deflection direction. In order to advance, the molten metal is forcibly concentrated at each intersection, and the molten metal that has proceeded diagonally hits the remaining surfaces 4 and 15 and changes its direction further diagonally, causing it to flow into the sea and become a laminar flow. At the same time, the thrusting forces that try to eject outwards are mutually suppressed.Therefore, the extreme cooling difference between the mold contact surface and the inside due to the laminar flow of the molten metal is eliminated, and the thrusting forces are mutually suppressed. There is a concern that the extreme cooling difference between the surface and the inside of the mold contact due to the flow will be eliminated, and that combined with the effect of suppressing each other's thrusting force, an unexpected situation may occur where some semi-solidified parts break and the molten metal spills out. Therefore, not only can the recess area of the gas vent inclined groove 3 and the gas vent inclined groove 14 provided around the cavity be significantly reduced, but also the outer dividing surface can be double-sided so that there is no fear of hot water splashing out. Without the need for contact, the present invention allows the non-supporting surface 5 and the non-rearing surface 16 to be recessed to form a space, and in conventional molds, lumps of molten metal etc. get caught in these parts, and the two metal molds It is now possible to create a space in the area with a large divided area, which not only interferes with the shaping of the mold, but also poses a constant risk of molten metal spouting out, and the risk of molten metal spouting is completely eliminated - operation can be stopped. It is an invention that greatly contributes to safety, work efficiency, and quality improvement, since there is no need for any mold cleaning work.

[Brief explanation of the drawing]

FIG. 1 is a front view of a fixed mold seen from the dividing surface side, showing an example of the implementation of the present invention. FIG. 2 is a front view of the movable mold seen from the dividing surface side. FIG. 3 is a longitudinal sectional view of the fixed and movable molds. FIG. 4 is a side view showing a state in which the fixed and movable molds are combined.
1...Fixed mold, 2...Fixed side cavity, 3
...Gas venting inclined groove, 4...Remaining surface,
5...non-support for the time being, 6...periphery, 7...'
Sprue spout, 8... Money opening, 9... Guide pin, 10
...Vacuum suction groove, 11..., Vacuum suction hole, 1
2...Movable mold, 13...Movable side cavity, 14...Gas vent inclined groove, 15...Remaining surface, 16...Non-contact surface , 17... Shu Midori, 18... Yuguchi, 19... Zenigomeguchi,
20...Pin hole. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. On the outer periphery of the fixed side cavity and the movable side cavity, which are provided in a protruding manner on the dividing surface side of each of the fixed mold and the movable mold, one end of the inside communicates with the cavity, and the other end is approximately 45 mm. A large number of slanted gas venting grooves 3 and 14 are recessed in parallel in the shape of a U-shape with a shallow cross section, and the fixed side and the slanted gas venting grooves 3 and 14 are diagonally crossed in the direction of On the outer periphery of the cavity on the movable side, one end is in communication with each cavity, the other end is provided facing outward, and in the middle is a surface on the same level as the mating surface A, in which many of the gas venting inclined grooves 3 and 14 are diagonally crossed. The remaining surfaces 4 and 15 of the mold are formed, and the dividing surface at the outer peripheral position where the gas vent inclined grooves 3 and 14 are recessed diagonally is recessed to leave only the peripheral edges 6 and 17 of the fixed and movable molds. A casting mold characterized in that contact surfaces 5 and 16 are each recessed.