JP2002331528A - Molding mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the ejection of a molten metal. SOLUTION: A degassing passage 16, when a mold is closed, is formed in the opposite surface of the mold 10 comprising a fixed mold 12 and a movable mold 13. Projected parts 22 are formed in a cross-sectional angular shape in a plurality of steps on a passage forming surface 19, and an X-axis channel 25 is formed between the projected parts 22. At the tip of each projected part 22, closing projected parts 23 adhering between the projected parts 21 of a passage forming surface 20 are formed zigzag up to the uppermost step. The area of the projected parts 22 in which no closing projected part 23 is formed is made an open projected part 24. The molten metal can alternately pass through a Y-axis channel 26 getting over the projected parts 22 from the open projected part 24 and the X-axis channel 25. A channel length in the degassing passage 16 is increased, and the ejection of the molten metal can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a molding die.

[0002]

2. Description of the Related Art Some molding dies for molding a die-cast product or the like are provided with a gas vent passage for discharging gas in a cavity in order to prevent entrainment of gas. As an example thereof, Japanese Utility Model Laid-Open No. 5-87753 can be mentioned. This gas vent passage communicates with the cavity 4 as shown in FIG. 8, and has irregularities on the opposing surfaces of the fixed block 5 and the movable block 6 fitted into the split surfaces of the pair of molds 1 that can be opened and closed. When the mold 1 is closed, the mold 1 is formed so as to meander in the opening and closing direction (Y-axis direction) of the mold 1 to form a wavy space that can pass upward. This means that the gas can be discharged, and the molten metal press-fitted from the injection machine 2 through the runner 3 discharges the gas in the cavity 4 out of the gas release passage 7 and then releases the gas before ejecting it out of the mold 1. The structure is such that rapid solidification in the passage 7 prevents jetting.

[0003]

However, although the gas vent passage 7 is provided with a measure for preventing the molten metal from being ejected as described above, the molten metal flows at a high pressure and may be ejected without solidification. Therefore, it is considered that the countermeasures for preventing the molten metal from blowing out are still insufficient. The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a degassing passage that effectively prevents the ejection of molten metal.

[0004]

As a means for achieving the above object, the invention of claim 1 is directed to a method in which a pair of openable and closable dies are provided on opposite surfaces in a closed state. And a gas venting passage formed in the cavity and communicating with the cavity to exhaust gas generated in the cavity to the outside of the mold. An X-axis flow path formed along an X-axis direction orthogonal to the Z-axis direction which is the gas extraction direction along the plane direction of the opposing surface of the mold, and the two molds orthogonal to the X-axis flow path And a Y-axis flow path formed along the Y-axis direction along the opening / closing direction. The two flow paths are connected alternately and continuously.

According to a second aspect of the present invention, in the first aspect, at least one of the opposing surfaces of the two dies is provided at a portion where the gas vent passage is formed.
The X-axis flow path is formed between the convex portions by arranging the convex portions projecting along the Y-axis direction in a plurality of stages along the Z-axis direction. A part of the convex portion has a predetermined width along the X-axis direction and becomes a closed convex portion which is in close contact with the opposing surface of the counterpart die when the die is closed, so that the gas cannot pass through in the Z-axis direction. At the same time, the closed convex portions are arranged in a zigzag manner in the Z-axis direction, and a region where the closed convex portion is not provided in the convex portion of each step has a lower cross-sectional mountain shape than the closed convex portion, and the closed convex portion has It is characterized in that it is an open convex portion forming a Y-axis flow path.

[0006]

According to the first aspect of the present invention, when the mold is closed and the molten metal is supplied into the cavity, the gas generated in the cavity is exhausted out of the mold through the gas vent passage. At this time, since the gas is exhausted by passing through the X-axis flow path and the Y-axis flow path alternately, compared with the conventional case where the gas passes through the flow path only along the Y-axis direction, the mold The flow path length can be efficiently secured in the inside, whereby the passage speed of the molten metal can be reduced, and the volume of the entire gas vent passage can be increased, so that blowing from the gas vent passage is also avoided. can do.

According to the second aspect of the present invention, the gas generated in the cavity firstly faces the open convex portion of the convex portion closest to the cavity, and the process of passing through the angled portion is the same as the process of passing through the Y-axis flow path. Become. On the other hand, since the closed convex portions are staggered in the Z-axis direction, the gas that has passed through the Y-axis flow path collides with the closed convex portion in the next-stage convex portion. At this time, since the gas cannot pass over the closed convex portion in the Z-axis direction as it is, the gas flows along the width direction of the closed convex portion, that is, X
It branches and flows along the axial flow path. Then, the gas reaches the open convex portion when passing through the end of the closed convex portion, so that Y
It flows along the axial flow path, and collides with the closing convex portion of the next stage. Thereafter, the gas flows along the X-axis flow path, and then flows into the Y-axis flow path at this stage. The gas is discharged out of the mold while repeating the above operation.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, a mold 10 comprises a fixed mold 12 and a movable mold 13 which can be opened and closed, and a cavity 15 is formed between the molds when the mold is closed. In addition, a nozzle 11 for supplying molten metal is incorporated in the fixed mold 12 side, and communicates with a cavity 15 via a runner 14.

Further, a fixed block 17 and a movable block 18 are attached to the opposing surfaces of the two dies, respectively. When the dies are closed, gas generated in the cavity 15 between the two dies is removed. A gas vent passage 16 for exhausting to the outside is formed.

As shown in FIGS. 2 and 3, the opposing surfaces of both blocks are a pair of passage forming surfaces 19 and 20 corresponding to each other. The passage forming surface 20 of the movable side block 18 is provided with a plurality of convex portions 21 each having a mountain-shaped cross section at a constant pitch interval.
0 is formed over almost the entire width. On the other hand, similar convex portions 22 are formed on the passage forming surface 19 of the fixed side block 17 so as to engage with the respective convex portions 21 of the movable side block 18 when both molds are closed. Each of the protrusions 22 of the fixed block 17 is provided with an overlay as described in detail below to form a closed protrusion 23 which is in close contact with the opposing surface of the movable block 18 when the mold is closed. are doing. That is, when the mold is closed, they are engaged with each other as shown in FIG. 2 so that the gas vent passage 16 is formed by the space defined by the convex portions 21 and 22 and the closing convex portion 23.

In describing the structure of the gas vent passage 16 in more detail, the left-right direction in FIG. 3 is the X-axis direction, the opening / closing direction of the mold 10 is the Y-axis direction, and the height direction is the same.
The direction that is the gas exhaust direction as a whole is called the Z-axis direction.

As shown in FIG. 3, the lower side of the first-stage projection 22 from below in the fixed block 17 is the cavity 1.
5, and at both ends of the convex portion 22, closed convex portions 23 having a mountain-shaped cross section are arranged. Since the portion where the closed convex portion 23 is provided is in close contact with the opposing surface of the movable block 18 when the dies are closed, the gas passes over the closed convex portion 23 in the YZ axis plane. However, since the area sandwiched by the two closed protrusions 23 forms an open protrusion 24 having a mountain-shaped cross section having a lower protruding height than the closed protrusion 23, a gap is maintained even when the mold is closed. Is done. Therefore, the gas from the cavity 15 can pass through the open convex portion 24, which is a region sandwiched between the two closed convex portions 23, as the Y-axis flow path 26 and reach the second-stage convex portion 22.

At the center of the second-stage projection 22, a closing projection 23 having substantially the same width as the width of the Y-axis flow path 26 in the first-stage projection 22 is arranged. Therefore, the gas that has passed over the first-stage convex portion 22 collides with the closed convex portion 23 of the second-stage convex portion 22, and the Y-axis flow path 26 is temporarily interrupted here. In addition, since a gap between the first-stage convex portion 22 and the second-stage convex portion 22 is a valley along the X-axis direction, the gas that has passed through the first-stage Y-axis flow path 26 has the valley edge. That is, it flows to the left and right along the X-axis channel 25. Further, on both sides of the closed convex portion 23 in the second convex portion 22, a Y-axis flow path 26 is formed by open convex portions 24 having the same width and a low protruding height, and gas passes through these to form a three-stage flow passage. It reaches the convex part 22 of the eye. The third-stage projections 22 are formed in the same manner as the first-stage projections 22. Thereafter, the projections 22 of each stage are configured by repeating the arrangement of the first-stage and second-stage projections 22. That is, since the closed convex portions 23 of each stage are arranged in a staggered manner along the Z-axis direction, the gas flows through the X-axis flow path 25 and the Y-axis flow path 26.
Are alternately repeated, and pass through each step, and the air is exhausted out of the mold 10 from the convex part 22 at the top of the figure.

Therefore, according to the first embodiment of the present invention configured as described above, when the molten metal is supplied into the cavity 15 after the mold is closed, the gas generated in the cavity 15 is vented. It enters the passage 16. Degassing passage 1
In the case of No. 6, since the fluid passes through the Y-axis flow path 26 and the X-axis flow path 25 alternately as described above, the flow path length to the outlet is smaller than that of the conventional product in which only the Y-axis flow path 26 is formed. It becomes longer, during which the solidification of the melt becomes possible. In addition to the meandering of the flow path, the molten metal collides with the closed convex portion 23 when displacing from the Y-axis flow path 26 to the X-axis flow path 25, so that the passing speed can be reduced. From the above, it is possible to efficiently prevent the molten metal from being blown out in the gas vent passage 16.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment is that a flat surface 31 is provided at the distal end of the convex portion 22 of the passage forming surface 19, between the convex portions 22, and at the distal end of the closed convex portion 30. Further, the closed convex portion 30 does not protrude from the tip of the convex portion 22, but protrudes from the passage forming surface 19 with a predetermined width similarly to the convex portion 22. Similarly, a flat surface 32 is provided on the other passage forming surface 20 so that the passage forming surface 20 has a shape that can correspond to the passage forming surface 19. The other structure is the same as that of the first embodiment, and therefore, the same effect can be obtained in preventing the molten metal from being blown out. In addition, the flat surfaces 31, 32
Is set, it is possible to avoid breakage or the like of the closing projection 30.

<Third Embodiment> FIGS. 6 and 7 show a third embodiment of the present invention. The difference from the second embodiment is the closing method in the Z-axis direction. Other structures are second
This is the same as the embodiment.

In the third embodiment, a first raised projection 22 provided on the passage forming surface 19 of the fixed block 17 is provided with a raised projection 35 in the right half area in FIG. . In the second stage, the closed convex portions 35 are provided on the left half, and are alternately formed up to the uppermost stage. Therefore, when the mold is closed, the right half of the first-stage convex portion 22 is closed, and the left-half region becomes the open convex portion 36 to form the Y-axis flow path 26. In the second stage, since the left half is closed, the Y axis flow path 26 is on the right side. Therefore, when the molten metal flows into the gas passage, it passes through the Y-axis flow path 26 on the left side, collides with the second-stage closed convex portion 35, passes through the X-axis flow passage 25 rightward, and When it reaches the open convex portion 36 when passing through the end of the portion 35, it can pass through the Y-axis flow path 26. Since the gas flows in the Z-axis direction while meandering in this manner, the same effect as in the second embodiment can be obtained.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention.

(1) In the above-described embodiment, the closed convex portion is provided on the fixed type side, but may be provided on the movable type side, or may be provided on both sides. (2) In the first and second embodiments, the first-stage closing projections are provided from both ends and are arranged in a staggered manner to the uppermost stage, but they may be provided from the center.

(3) In the third embodiment, the first-stage closing projections are provided alternately from the right side, but may be provided from the left side. (4) The closed convex portion does not necessarily need to be formed integrally with the convex portion, and may be formed separately and fixed by means such as welding or screwing.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a mold according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a gas vent passage.

FIG. 3 is a perspective view of a fixed block forming a gas vent passage.

FIG. 4 is a sectional view of a gas vent passage in a second embodiment.

FIG. 5 is a perspective view of a fixed block forming a gas vent passage.

FIG. 6 is a sectional view of a gas vent passage in a third embodiment.

FIG. 7 is a perspective view of a fixed block forming a gas vent passage.

FIG. 8 is a schematic sectional view of a mold in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Die 15 ... Cavity 16 ... Gas release path 21, 22 ... Convex part 25 ... X-axis flow path 26 ... Y-axis flow path 23, 30, 35 ... Closed convex part 24, 36 ... Open convex part

Claims (2)

[Claims] 1. A pair of openable and closable dies are provided on mutually opposing surfaces in a state where the dies are closed, and a cavity for molding is communicated with the cavities to exhaust gas generated in the cavities to the outside of the dies. And a degassing passage for forming the degassing passage, wherein the degassing passage extends along a plane direction of the opposing surfaces of the two dies and is orthogonal to a Z-axis direction which is the degassing direction of the gas. An X-axis flow path formed along the X-axis direction
And a Y-axis flow path formed along the Y-axis direction perpendicular to the axial flow path and along the opening and closing direction of the two dies, and both flow paths are connected so as to be alternately continuous. Mold for molding. 2. A projecting portion projecting along the Y-axis direction is provided on at least one of the opposing surfaces of the two dies at a portion where the gas vent passage is formed along the Z-axis direction. By being arranged in a plurality of stages, the X-axis flow path is formed between the convex portions, and a part of the convex portions in each stage has a predetermined width along the X-axis direction, and When the mold is closed, the gas is in close contact with the opposing surface of the counterpart mold so that the gas cannot pass in the Z-axis direction. The closed protrusions are arranged in a zigzag manner in the Z-axis direction. A region of the convex portion where the closed convex portion is not provided is an open convex portion that forms the Y-axis flow path when the mold is closed and has a cross-sectional mountain shape lower than the closed convex portion. The molding die according to claim 1.