JPS6092059A - Venting device for die-casting die - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a tie-cast type gas plating device used in a tie-cast casting method. [Prior Art] Conventionally, a persimmon die-cast type gas handling device having a structure shown in FIG. 1 is well known. Sweat, in Figure 1,

[is fixed type 2'! 1 is a product part (mold cavity) formed in a vertically movable type; 3 is a gas drainage passage whose one end communicates with the product part 1; 4 is a gas passage branched from the gas vent passage 3; Reference numeral 5 denotes a valve support that moves up and down by the operation of a hydraulic cylinder 6, and this valve support 5 is provided with a hobbet valve 7. Then, the poppet valve 7 is attached to the coil spring 8 in the closing direction of the gas vent passage 3 so that the poppet valve 7 or the gas handling passage 3 is shut off when the valve support body 5 is seated on the fixed type 2 or the movable type. is energized. On the other hand, the bypass passage 4 is formed in the valve support 5 and opens to the outside of the fixed mold 2i or the movable mold via a boat 9. According to the above configuration & (, the product section 1 is pressurized and filled with molten metal, the gas in the product section 1 is discharged through the bypass passage 4, and then pushed up to the gas discharge passage 3 at the end of filling. The pressure of the molten metal pushes up the poppet valve 7 against the spring force of the spring 8 on the coil, thereby blocking the bypass passage 4. However, in the above-described gas venting device,
Usually, in order to install a degassing mechanism on the mating surface of the fixed mold and the movable mold, a hydraulic cylinder 6 for driving the valve support 5 is installed in the mold in which the core is placed, in addition to the cylinder for moving the core. ), which greatly limits the locations where the degassing mechanism can be accessed. In addition, since the pressure of the molten metal is received by the pushing force of the hydraulic cylinder, the hydraulic cylinder 6 is very large.
Oil leakage is more likely to occur as the number of shots increases. [Object of the Invention] In view of the above-mentioned points, it is an object of the present invention to provide a structure of a tie-cast type degassing device in which space constraints are alleviated. [Structure of the Invention] For this purpose, the present invention includes a core that forms a predetermined product part together with an identification type and a movable type, and this core has a stepped shape and is actuated by a predetermined actuator. In a die-casting mold configured to slide, the fixed or movable mold has a gas venting passage whose one end communicates with the product part, and a bypass passage which branches from this gas handling passage and opens outside the mold. At the same time, l!
When the mold is clamped, the core is seated at the other end of the gas release passage due to the tightening force and opens the bypass passage.
It is characterized by a configuration in which a valve body is provided that slides to shut off the bypass passage when molten metal pressure is applied. Hereinafter, more specific embodiments of the present invention will be described in detail based on the drawings. FIGS. 2 and 3 are diagrams showing one embodiment of the present invention. In the figure, lO is a core that is arranged between an identification mold 11 and a movable mold 12 and has a stepped portion 10a, and a predetermined shape is formed by the fixed mold 11, the movable mold 12, and the core 10. The core 10 forms a product part (mold cavity) 13, while the core 10 serves as a hydraulic cylinder 14 as an actuator.
Its function is to slide in the vertical direction as shown in Figure 2. Then, the movable mold 12 is provided with a gas venting passage 1 as in FIG.
5, and a pair of bypass passages 6 branched from the gas vent passage 15. On the other hand, the core IO is provided with a poppet valve 17 for opening and closing the gas vent passage 15 and the bypass passage 16, and as shown in FIG. 12, the Shibopet valve 17 is seated on one end surface of the gas venting passage 15 by the force of the coil spring 18, blocking the gas handling passage 15, and closing the bypass passage 16. It is designed to open. 19 is an opening, and 20 is a gas exhaust groove provided to communicate with the opening 19 at all times. In the above configuration, the core 10 is lowered and the nuclear core 10
The fixed mold 11 and the movable mold 12 are aligned and clamped by sandwiching them between them. At this time, as shown in Figure 2, the core lO
At the same time as the poppet valve 17 is set, the poppet valve 17 is also set to its normal position. It opens outside the mold via a gas exhaust groove. From this state, when the injection plunger (not shown) pressurizes and fills the product section 13 with molten metal, the gas in the product section 13 is filled and pushed out into the molten metal, causing the bypass passage 16
The gas is discharged from the mold through an opening 19 and a gas discharge groove. Then, at the end of filling with molten metal), gas discharge passage 1
When the molten metal is pushed out up to 5, the molten metal flows above (upstream side) of the poppet valve 17, but the pressure of the molten metal pushes up the texture bet valve 17, so the poppet valve 17F'i. Gas exhaust passage 15't-opens while bypass passage 16 is blocked. As described above, the gas in the product portion 13 is reliably discharged prior to die-casting. In the above process, the core 10 receives the molten metal pressure directly, but the molten metal pressure that the core 10 receives is
As shown in the figure, since the slope portion 11 & on the fixed mold side corresponding to the stepped portion 10 m receives the pressure, the pressure of the molten metal does not burden the hydraulic cylinder 14 as in the conventional case. Figure 4 shows the state in which the Oka and core lO are pulled out. FIG. 5 shows another embodiment of the present invention, and the main difference from the previous embodiment is that the poppet valve 17 is set by pneumatic pressure. To be more specific, after the mold clamping is completed, compressed air is introduced from the boat η into the chamber 21 in which the coil spring 18 is disposed, and by using both this air pressure and the springing force of the coil spring 18, the poppet is Seat valve 17. Then, before the injection, the boat 22
By releasing U14 into the atmosphere, the poppet valve 17 receives the pressure of the molten metal and operates reliably in the same way as in the previous embodiment. In the case of this embodiment, it is possible to improve the reliability of the valve operation even though it is not affected by the adhesion of burrs or the like. [Effects of the Invention] As described above in detail, the present invention has the following effects because the valve body for gas discharge is installed on the core side. (1) Since the valve body can be set using the movement of the core, there is no need to provide a dedicated actuator for the valve body.
Only requires small installation space. Moreover, when installing the gas venting mechanism in an existing tie-cast mold, it can be handled with a slight modification. (2) Since the injection pressure that the core receives is ultimately applied to the fixed or movable mold, it does not place a burden on the actuator for moving the core, and the actuator can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing an example of a conventional die-cast type gas venting device, FIG. 2 is a cross-sectional explanatory diagram showing an example of a die-cast type gas venting device according to the present invention, and FIG. 2 is a cross-sectional view taken along line 1-1 in FIG. 2, FIG. 4 is a cross-sectional explanatory view for explaining the operation of FIG. 2, and FIG. 5 is a cross-sectional explanatory view showing another embodiment of the present invention. be. IO... Core, lOa... Step part, 11... Fixed type, ]2... Movable type, 13... Product section, 14... Hydraulic cylinder (actuator), 15... Gas dependent passage, 16... bypass passage, 17... poppet valve (
Valve body), 18...Coil spring) 2 people Figure 1 Figure 2 - Figure 3

Claims (1)

[Claims] +11 It is equipped with a core that forms a predetermined product part together with the fixed type hexagram and the UJ' iIl type, and this core t has a stepped shape and r! The fixed type or the movable type has a gas venting passage that communicates with the product part at one end, and a gas venting passage that branches off from this gas venting passage and extends outside the mold.
In addition, the core has a spring biasing force applied to the other end of the gas release passage to open the bypass passage when the mold is clamped, and a slide passage when subjected to molten metal pressure. A tie-cast type gas venting device, further comprising a valve body that shuts off the bypass passage.