JPS5897478A - Venting device for die - Google Patents

Abstract

PURPOSE:To provide a venting device for dies which prevents laminar flow, suppresses rectilinear forces, vents gases thoroughly and permits sure removal of the residues in the venting parts by so constituting the device that the molten metal in the venting parts of the body of the venting device provided to a stationary die is crossed. CONSTITUTION:A stationary die A and a movable die B are closed for the purpose of molding, and the mating surface 2 of a body 1 and the mating surface 19 of a counter face plate 17 of the body are closed as well. Return pins 12 are pushed in the direction opposite to the surface 2 to retreat a pin sliding plate 9. Ejector pins 14 are also retreated simultaneously until the preceding end parts of the pins 14 are made flush with the bottom surfaces of communicating holes 4 on the cavity side and discharging grooves 7 for gases so as to avoid interfering the passage of mixed fluids of the gases and molten metal passing through the inside of the grooves. When the die B is opened upon ending of the molding, the pressing forces upon the pins 12 are released; therefore, the plate 9 is moved to the surface 2 side by the pressing force of leaf springs 16 to project the preceding end parts of the pins 14... simultaneously from the bottom surfaces of the grooves 4 and the grooves 7 by which the residues stuck in the grooves 4 and the grooves 7 are knocked off and are thoroughly removed.

Description

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

As is well known, in casting operations, when the molten metal is fully pressurized, it is essential to establish a gas venting section that exhausts the air in the mold to communicate with the cavity to vent gas from the molten metal.
The structure of the gas venting part of the mold has been studied in various ways because the quality of the product depends entirely on how well the gas inside the cavity and histone sleeve, which causes pinholes, etc., can be completely released and is the cause of defective products. There is.

However, the gas venting section uses a gap of about 0.1% between the mold mating surfaces of both molds (movable and fixed) to fully vent gas, but when the molten metal comes into contact with the mold surface, contact occurs. The surface instantly enters a semi-solidified state and the viscosity increases, resulting in a laminar flow immediately, forming a coagulated film on the contact surface of the mold, through which the molten metal in the center advances under strong pressure while being kept warm. Since there is a risk that the cross-sectional area may be ejected from the mold, gas can be easily removed by increasing the cross-sectional area, but there is a problem in that the cross-sectional area cannot be increased. For this reason, research has been conducted to prevent the laminar flow of the bath water by crossing all the pressurized molten metal injected into the gas venting part, and to suppress the straight blade blades to ensure sufficient gas venting (for example, in the Showa era). 1155 Patent Application No. 69107, 1988 Patent Application No. 108392), although the above effects can be expected with the conventional gas venting part, there is a problem in treating the residue in the gas venting part after molding, and the inside of the cavity Residues adhering to the gas venting part were removed using an extrusion bin linked with molded product extrusion, but this not only complicates the structure, but also makes the mounting location of the gas venting part difficult to mount and remove the core. Is there a problem such as being limited by I have.

The problem with unexploded FJJs is that the molten metal in the degassing section is completely crossed to completely prevent laminar flow, as well as to completely suppress the straight-line force and to perform sufficient degassing. This device was invented for the purpose of providing a mold degassing device that can be easily used for molds such as molds, and can reliably remove the residue in the degassing section each time the mold is closed. To explain the drawing showing an example of 0 to F implementation, ■ is the main body of the gas venting device which is approximately rectangular and is screwed onto the gas venting part position of the fixed mold A, and the mating surface 2 is the inside K. Screw 3,
At step 3, screw onto the fixed mold A from the outside. 4, 4 are the communication grooves on the A/bite side, which are parallel to the f rows in the gas venting direction (upper and lower blade direction in Fig. 1) with a groove shape of approximately U-shaped cross section in the mating surface 2 soil, and one end side is It communicates with the cavity 5, and the other end is bored to a position where the outer end surface 6 of the main body I has some thickness remaining. 7, 7... are gas exhaust grooves formed on the mating surface 2 in parallel with the cavity-side communication groove 4 at regular intervals and having a groove shape of approximately U-shape in cross section, one end of which extends to the outer end surface 6. The hole is opened at the other end, and the other end is drilled to a position where there is some wall thickness left on the inner end surface of the main body 1. 8, 8... communicate with the cavity side communication groove 4 on one end side, and the other end side is provided in parallel in a branch shape in an oblique direction toward the gas exhaust groove 7 side, so that the entire gas exhaust groove 7 on the other end side is provided. The cross section that communicates with the cross section is a cross-venting groove in the shape of a hollow groove. Reference numeral 9 denotes a bottle sliding plate which is loosely fitted into a sliding chamber 11 in which a sliding surface 10 is provided inside the main body 1 in a direction perpendicular to the mating surface 2 so as to be slidable in a direction perpendicular to the mating surface 2. Reference numeral 12 indicates return pins installed at approximately four corners of the surface of the mold mating surface of the bottle sliding plate 9, which are bored in the main body l, and are slidably and loosely fitted into the turbine/bottle sliding hole 1. , the tip is provided to a length such that the tip protrudes from the alignment point 2 by an amount equivalent to the return distance at the position where the bottle sliding plate 9 reaches the mold alignment point 1i11K in the sliding chamber 11. 14, 14, . . . are bottle sliding plates. With the extrusion bits planted on the surface of the mold mating surface of No. 9,
The tip part is connected to the above-mentioned gap, the communication groove 4 and the gas extraction groove 7.
The extrusion bottle 14 is slidably and loosely fitted into an extrusion bottle sliding hole 15 formed in the main body 1 so as to protrude from the bottom of the return bin 12, and the length of the extrusion bottle 14 is such that the tip of the return bin 12 is at the same level as the tip of the return bin 12. It is provided with a length that is at the same level as the bottom surfaces of the cavity side communication groove 4 and the gas exhaust groove 7 at the returned position.

16. 16... is a plate-shaped leaf spring provided in the sliding chamber lJ so as to overlap with each other, and is in contact with the back side opposite to the mating surface of the bottle sliding plate 9, and the bottle sliding plate 9 is placed on the side of the mold mating surface. O17, which is always pressed, is a face plate facing the main body of the gas venting device that is screwed onto the gas venting portion of the movable mold B. 18.18... is a movable side cross-section formed in the surface of the joint 19 of the main body facing face plate 17 in a groove shape having a U-shaped cross section to intersect diagonally in the opposite direction to the cross-gas vent grooves 8.8... This is a gas vent groove.

Reference numeral 20 denotes a No. 1 screw which is loosely inserted into the bud hole 22 of the main body facing plate 17 from the outer end surface 21 side of the main body facing plate 17 toward the inner movable mold surface, and is connected to the movable mold B via the leaf spring 23. The main body facing face plate 17 is supported so as to be movable by a small amount. Reference numeral 24 denotes a roller insertion groove formed along the inner surface of the main body facing face plate 17 from the inner surface 250 toward the inner side 1i11 and having an inverted U-shape in cross section. 26 is a roller fitted into the roller fitting groove 24. 27.27・ is the main body facing plate 17
The main body facing face plate 17 is constantly pressed to the inside of the mold mating surface by a leaf spring that is in heavy contact with the back surface 28 on the opposite side to the mold mating surface side. 29 is the outer surface of the movable mold B. 30 is the outer surface 2
9, the medial Ic direction is the genital fC screw insertion hole. 31
The plate spring 32 is inserted into the head side shaft part, and the plate spring 27 is inserted into the tip side shaft part with a floating screw for suppressing the main body facing face plate 17, and the tip screw part is screwed into the back surface 28 side. Main body facing face plate 17' (supported in a +-floating state.

Since the present invention has such a configuration, a fixed mold A and a movable mold B are used.
When these are closed for molding, the mating surface 2 of the main body L and the mating face plate 170 of the main body 19 are also closed, so the return pin 1
2 is pushed in the opposite direction to the mold mating surface (to the left in FIG. 1), the pin sliding plate 9 retreats, and the ejection pin 14 also retreats all at once, so that the tip of the ejection pin 14 enters the cavity side communication groove. 4 and the bottom surface of the gas discharge groove 7, the passage of the mixed fluid of gas and molten metal passing through the groove is not obstructed. In addition, since the main body facing face plate 17 is constantly pressed against the mold mating surface side with a constant floating pressure, the mating surfaces 2 and 19 are closed, so that the two mating surfaces are in close contact with each other, and the cavity side communication groove 4 and the gas exhaust groove 7 are closed. The movable side cross gas vent grooves 18 are recessed from the mating surface of the cross gas vent grooves 8 and 9.
overlap, so the cross gas vent groove 8 and the cross gas vent groove 1
8 cross obliquely with each other and communicate with each other, and also communicate with the cavity side communication groove 4 and the gas exhaust groove 7. Therefore, a part of the gas of the molten metal press-fitted into the cavity 5 and a mixed fluid of the molten metal enter the cavity 1111 communication groove 4 through the gas vent groove 33, but the cavity side communication groove 4 has a dead end at the end. Therefore, the mixed fluid that has entered is injected all at once into the gas exhaust groove 7 through the branch-shaped cross gas vent groove 8 and the movable side cross gas vent groove 18 that overlaps with this, and is then injected into the gas exhaust groove 7. 7, Shigas will be ejected outside the aircraft. In this case, the mixed fluid passing through the intersecting gas venting groove 8 and attempting to be ejected and the mixed fluid passing through the movable side intersecting gas venting groove 18 and attempting to be ejected obliquely cross and collide with each other, and the collision part Since the molten metal crosses each other diagonally in the direction of travel, acting in the torsional direction, the molten metal intersects at each intersection, and all of the molten metal's thrusting force becomes turbulent flow generation force, so the mold surface and the inside of the molten metal are reliably stirred. It destroys the coagulation film that completely inhibits the heat exchange, so it completely prevents the formation of laminar flow, and since the molten metal does not suppress each other, the molten metal is uniform and solidifies with good heat exchange. The gas passes through seven gas exhaust grooves and is completely exhausted outside the mold. Next, when the molding is finished and +iJ moving mold B is opened, the pushing force of the return pin 12 is released, so the shear bin sliding plate 9 moves to the inside of the mold alignment due to the pushing force of the leaf spring 16, and the extrusion pin 14. 14 - The tip of the jar protrudes all at once from the bottom of the cavity side communication groove 4 and the gas exhaust groove 7,
It becomes possible to push down and completely remove the residue stuck in the cavity-side communication groove 4 and the gas exhaust groove 7.

Therefore, when performing a misfire FJAk, it is not only possible to completely degas the molten metal, which affects the quality τ, but also to fully operate the return beam/extrusion pin for residue disposal using the mold mating surface pressure. Therefore, if it is a mating mold, it can be easily installed and removed from any mold regardless of the installation location, and this invention has the effect of being able to be used for various molds.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an example of the implementation of the present invention. FIG. 2 is a diagram showing the main Mlik on the identification mold side of the present invention, and is a right side view seen from the mold mating surface side. No. 3
The figure is its bottom view. FIG. 4 is a left side view showing the main part of the n] moving alloy mold side of the present invention, as seen from the mold mating surface V. FIG. 5 is a stop view thereof. The figure ( ) is a right side view of the fixed mold side showing the intersecting state of the intersecting gas vent grooves.

Claims (1)

[Claims] (1) Screw the nearly rectangular main body of the degassing device to the degassing position of the fixed mold with the mating surface inward, and place the main body parallel to the degassing direction on the mating surface of the main body, with one end facing the cavity side. a cavity side communication groove that communicates only with the main body, and the other end side does not reach the outer end surface of the main body, and one end side extends on the mating surface parallel to the cavity side communication groove with a certain interval, The other end side is a fully parallel membrane with gas exhaust grooves that do not reach the inner end surface of the main body, and one end side is connected to the cavity side communication groove on the mating surface, and the other end side is connected to the gas exhaust groove side. A plurality of intersecting gas vent grooves that communicate diagonally toward the main body are arranged in parallel, a sliding chamber is provided inside the main body, and a pin sliding plate is slidably moved toward the mating surface in the sliding chamber. A return pin is fitted into the pin sliding plate and has a length such that when the pin sliding plate moves toward the mating surface, the tip portion protrudes from the mating surface, and a return pin long enough to protrude from the bottom surface of the cavity side communication groove and the bottom surface of the gas exhaust groove. The extrusion pins are each implanted and loosely fitted into the main body, the pin sliding plate is constantly pressed by a leaf spring, the return pin and the ejection pin are made to protrude from the mating surface, and the position facing the main body is movable. On the mold side, the main body facing face plate is supported in a floating state by a floating screw via a leaf spring on the opposite side of the mating surface and the outer end surface, and on the mating face of the main body facing face plate, there is a groove diagonally opposite to the cross gas vent groove. A degassing device for a mold, characterized in that movable side cross degassing grooves that intersect with each other are formed with multiple films in an oblique direction.