JP3922703B2 - Mold venting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a degassing apparatus for a mold that is incorporated in a die casting mold and discharges gas remaining in a mold cavity when pouring.
[0002]
[Prior art]
When a molten metal made of a metal material is poured into a cavity of a die casting mold, if gas remains in the cavity, a cavity called a nest is formed inside the die cast product. Therefore, generally, a die casting apparatus is provided with a device for discharging the gas in the cavity (mold degassing device).
[0003]
As a conventional mold degassing apparatus, a structure in which a degassing passage communicating with a cavity is formed in a mold and a vacuum apparatus is connected to the degassing path is known. There is a problem in that the vacuum equipment is expensive and requires a large amount of equipment costs.
Therefore, a structure in which a decompression chamber using Bernoulli's theorem is provided outside the mold and the decompression chamber is communicated with a gas vent passage to forcibly exhaust the gas in the cavity has been proposed. (For example, see Patent Documents 1 to 4)
[0004]
[Patent Document 1]
JP 7-299553 A
[Patent Document 2]
JP-A-11-226715
[Patent Document 3]
JP-A-10-328805
[Patent Document 4]
Japanese Patent Laid-Open No. 4-158966
[0005]
[Problems to be solved by the invention]
However, in each of the mold venting devices disclosed in the above patent documents, a decompression chamber for forced gas exhaust is provided outside the mold, and a gas vent passage formed inside the mold is provided. Due to the structure connecting the decompression chambers, there was a drawback that the exhaust efficiency was reduced due to the generation of a gap accompanying the expansion of the mold. That is, when pouring a molten metal made of a metal material, the mold is heated and expands three-dimensionally. On the other hand, since the decompression chamber disposed outside the mold is not heated, a slight gap is formed in the connecting portion with the decompression chamber as the mold expands. And since air | atmosphere flows in into a decompression chamber from this slight clearance gap, the phenomenon which the exhaust_gas | exhaustion efficiency in the cavity via a degassing path | pass fell has arisen.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mold gas venting device that can efficiently exhaust the gas in the cavity and that the exhaust efficiency does not decrease.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 includes a fixed gas vent block fitted into a fixed mold and a movable gas vent fitted into the movable mold and brought into contact with the fixed gas vent block when the mold is closed. A degassing device for a mold, in which a corrugated hot water spray preventing passage communicating with the mold cavity is formed on the contact surface of each degassing block,
The fixed vent block is inside,
It includes a nozzle that communicates with the hot water spray prevention passage through the gas vent passage, and a narrow gap formed around the opening of the nozzle, and a negative pressure is generated in the hollow portion of the nozzle by allowing compressed air to flow through the narrow gap. A negative pressure generating part to
In addition, an air supply passage that guides compressed air supplied from the outside to the narrow gap of the negative pressure generating portion, and compressed air led to the narrow gap of the negative pressure generating portion through the air supply passage is formed in the fixed mold. And an exhaust passage for exhausting to the outside through the exhaust hole.
[0008]
As described above, in the present invention, since the negative pressure generating portion is formed inside the fixed degassing block fitted in the fixed mold, a negative pressure is generated inside the mold, and therefore, it is affected by the expansion accompanying the heating of the mold. Therefore, the gas in the cavity can be efficiently exhausted, and the exhaust efficiency is not lowered.
[0009]
Moreover, even if the molten metal flows out of the cavity as the gas is released, the molten metal is cooled and solidified in the wave-shaped hot water blowing prevention passage, so that the molten metal does not flow into the gas removal passage. Since the hot water blowing prevention passage is formed on the contact surface of each degassing block, the metal material solidified in the passage can be easily removed when the mold is opened.
[0010]
According to a second aspect of the present invention, there is provided a tubular exhaust sleeve mounted on the fixed gas vent block, and an exhaust passage is formed by the hollow portion of the exhaust sleeve, and the tip of the exhaust sleeve and the open end of the nozzle A narrow gap is formed between the two.
[0011]
The negative pressure generating part of the present invention uses Bernoulli's theorem to generate negative pressure in the hollow part of the nozzle by supplying compressed air to a narrow gap formed around the nozzle opening. In such a configuration, the dimensional accuracy of the narrow gap greatly affects the degree of negative pressure. In the second aspect of the invention, a narrow gap is formed around the opening of the nozzle by the exhaust sleeve which is a separate part from the fixed gas vent block. Therefore, high dimensional accuracy can be achieved by adjusting the mounting position of the exhaust sleeve. Thus, a narrow gap can be formed, and a large negative pressure can be generated in the hollow portion of the nozzle.
[0012]
The invention of claim 3 is provided with a cylindrical exhaust seal bush in which a male screw is formed on at least a part of the outer peripheral surface on the premise of the configuration of claim 2.
The fixed gas vent block is formed with a hollow portion that opens to an end surface that contacts the fixed mold and into which an exhaust sleeve can be inserted.
On the inner peripheral surface of the opening of the hollow portion, there is a female screw that can be screwed at least partially with a male screw formed on the outer peripheral surface of the exhaust seal bush, and can screw the exhaust seal bush inward from the end surface of the fixed gas vent block. Formed,
In addition, the exhaust seal bush moves to the outside of the end face of the fixed gas vent block in accordance with the screw operation portion for rotating the male screw through the exhaust hole formed in the fixed mold and moves to the fixed mold. And a seal portion that is in pressure contact with each other.
[0013]
In the present invention having the above-described configuration, first, the exhaust seal bush is screwed inward from the end face of the fixed gas vent block. In this state, the fixed gas vent block can be fitted into the fixed mold without the seal portion provided on the outer end surface of the exhaust seal bush interfering with the fixed mold. Next, by rotating the exhaust seal bush in the reverse direction, the seal portion is moved outward from the end face of the fixed gas vent block and is pressed against the fixed mold. Thereby, it is possible to easily and reliably seal between the fixed gas vent block and the end face of the fixed mold.
[0014]
The invention of claim 4 is based on the configuration of claim 3,
On the outer peripheral surface of the exhaust sleeve, a male screw is formed at least partially in a spiral direction opposite to the male screw formed on the outer peripheral surface of the exhaust seal bush.
In addition, the inner peripheral surface of the exhaust seal bush is formed with a female screw into which a male screw formed on the outer peripheral surface of the exhaust sleeve is screwed.
[0015]
With such a configuration, the narrow gap can be set with high dimensional accuracy only by adjusting the screwing amount of the exhaust sleeve with respect to the exhaust seal bush.
[0016]
The invention according to claim 5 includes a cylindrical pneumatic seal bush in which a male screw is formed on at least a part of the outer peripheral surface,
The air supply passage opens at an end surface in contact with the fixed mold of the fixed gas vent block, and communicates with an air supply hole formed in the fixed mold through the opening.
The inner peripheral surface of the opening of the air supply passage can be screwed at least partially with a male screw formed on the outer peripheral surface of the pneumatic seal bush, and the pneumatic seal bush can be screwed inward from the end surface of the fixed gas vent block. A female thread is formed,
In addition, the pneumatic seal bush has a screw operation part for rotating the male screw of the pneumatic seal bush through an air supply hole formed in the fixed mold, and an outer side than the end face of the fixed degassing block in accordance with this rotation operation. And a seal portion that is in pressure contact with the fixed mold.
[0017]
With this configuration, it is possible to easily and reliably seal between the fixed gas vent block and the end face of the fixed mold only by operating the pneumatic seal bush in the same manner as the exhaust seal bush.
[0018]
Furthermore, the fixed gas vent block communicates with the hollow portion of the nozzle inside, and opens to an end surface in contact with the fixed mold, and is a pressure sensor provided outside through a detection hole formed in the fixed mold from the opening. It is preferable to form a detection passage that leads to (Claim 6). If comprised in this way, the pressure sensor can always confirm the decompression condition of a negative pressure generation part, and the reliability of a degassing effect | action will improve.
[0019]
In the present invention of the configuration having the detection passage, further comprising a cylindrical detection seal bush having a male screw formed on at least a part of the outer peripheral surface,
On the inner peripheral surface of the opening of the detection passage, a female screw is formed that can be screwed at least partially with a male screw formed on the outer peripheral surface of the detection seal bush, and the detection seal bush can be screwed inward from the end surface of the fixed gas vent block. And
In addition, the detection seal bush moves to the outside of the end face of the fixed degassing block along with the screw operation portion for rotating the male screw of the detection seal bush through the detection hole formed in the fixed mold. And a seal portion that is in pressure contact with the fixed mold.
[0020]
With this configuration, it is possible to easily and reliably seal between the fixed gas vent block and the end face of the fixed mold only by operating the detection seal bush in the same manner as the exhaust seal bush.
[0021]
Further, if a molten metal trap including a deep groove formed in the terminal portion of the hot water blowing prevention passage and a tapered pin extending from the inner bottom of the deep groove into the gas vent passage is formed in the movable gas vent block, Even when the molten metal passes through the hot water blowing prevention passage, it can be cooled and solidified in the deep groove, and the flow of molten metal into the gas vent passage can be more reliably prevented. Further, even when the molten metal flows into the gas vent passage through the deep groove, the melt solidifies on the outer peripheral surface of the pin, so that it can be extracted from the gas vent passage integrally with the pin when the mold is opened. . And since the pin is formed in the taper shape, the metal material solidified on the outer peripheral surface can be easily removed.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments in which the present invention is applied to a die casting mold will be described in detail with reference to the drawings.
FIG. 1 is a side sectional view showing an outline of a degassing apparatus for a mold according to this embodiment. As is well known, the die casting mold is composed of a fixed mold 100 and a movable mold 200. A cavity 300 is formed on the contact surface of each of these molds 100 and 200 according to the product shape, and a molten metal is poured into the cavity 300 to perform die casting of the product. On the contact surfaces of the molds 100 and 200, recesses 101 and 201 for incorporating the mold degassing apparatus according to the present embodiment are formed in advance.
[0023]
The degassing device for a mold is applied to the fixed degassing block 10 fitted in the concave portion 101 of the fixed mold 100 and the fixed degassing block 10 fitted in the concave portion 201 of the movable mold 200 and being closed. And a movable gas vent block 20 in contact therewith.
[0024]
FIG. 2 is a front view of the fixed gas vent block, and FIG. 3 is a front view of the movable gas vent block.
On the contact surface of the fixed gas vent block 10 that contacts the movable gas vent block 20, a plurality of ridges 11 are formed side by side. On the other hand, on the contact surface of the movable gas vent block 20, the above ridges 11 are formed. A plurality of concave ridges 21 into which are inserted are formed side by side. When the blocks 10 and 20 come into contact with each other, a corrugated hot water spray preventing passage 30 is formed between the ridges 11 and the ridges 21 (see FIG. 1). The inlet (lower end opening in FIG. 1) of the hot water spray preventing passage 30 communicates with the cavity 300 through a gas vent hole 301 formed in the contact surface of each mold 100, 200.
[0025]
The outlet of the hot water blowing prevention passage 30 communicates with the gas vent passage 12 formed in the fixed gas vent block 10. The gas vent passage 12 is depressurized by the action of a negative pressure generator A described later. At this time, the gas in the cavity 300 is discharged through the hot water blowing prevention passage 30 or the gas vent passage 12 with a pressure difference generated between the cavity 300 and the cavity 300. At this time, the molten metal poured into the cavity 300 may flow into the hot water blowing prevention passage 30.
[0026]
The hot water blowing prevention passage 30 has a function of cooling and damming the molten metal flowing out of the cavity 300 in this way. That is, since the hot water spray preventing passage 30 formed in a wave shape has a large surface area on the inner wall, the cooling efficiency of the molten metal is high. In addition, since the molten metal is less likely to flow due to the wave shape, the movement of the molten metal is remarkably decelerated in the hot water blowing prevention passage 30. The molten metal decelerated and absorbed in this way is solidified in the hot water blow prevention passage 30. The metal material solidified in the hot water spray preventing passage 30 can be easily removed after the mold is opened. As shown in FIG. 3, an extrusion pin 22 can be projected and retracted in the concave strip 21 of the movable gas vent block 20, and the metal material attached to the contact surface of the movable gas vent block 20 is an extrusion pin. 22 to remove.
[0027]
As shown in FIG. 1, a molten metal trap 31 is provided at the end portion (that is, near the outlet) of the hot water spray preventing passage 30. The molten metal trap 31 includes a deep groove 23 formed in the movable gas vent block 20 and a tapered pin 24 extending from the inner bottom of the deep groove 23 into the gas vent passage 12.
The deep groove 23 is formed in a mortar shape at the end portion of the hot water spray preventing passage 30. Therefore, even if the molten metal flows up to the end portion of the hot water blowing prevention passage 30, the molten metal is guided into the deep groove 23 and is accumulated therein to be solidified. Is prevented.
[0028]
A nipple 40 having a taper hole 41 having a draft angle is attached to the inlet of the gas vent passage 12 formed in the fixed gas vent block 10, and the pin 24 extends into the taper hole 41 (FIG. 1). reference). A fixed gap is formed between the taper hole 41 formed in the nipple 40 and the pin 24, and even if the molten metal overflows from the deep groove 23, the molten metal is tapered. To the taper hole 41. Since the taper hole 41 is formed in a drop gradient, the metal material solidified on the outer peripheral surface of the pin 24 is extracted from the gas vent passage 12 integrally with the pin 24 when the mold is opened. As shown in FIG. 3, the push pin 22 can be projected and retracted also on the inner bottom surface of the deep groove 23, and the metal material fixed to the tapered pin 24 is removed by the push pin 22.
[0029]
4-8 is a figure which shows the structure of the fixed degassing block 10 along an assembly order.
As shown in FIG. 4, a hollow portion 13 penetrating both side surfaces is formed inside the fixed gas vent block 10, and a cylindrical nozzle whose outer peripheral surface is tapered in the middle portion of the hollow portion 13. 50 is disposed. Further, the end of the gas vent passage 12 described above communicates with the rear portion of the nozzle 50, and the end of the air supply passage 14 communicates with the front portion. The start end of the air supply passage 14 is open on the upper surface of the fixed gas vent block 10. The front portion of the hollow portion 13 where the end of the air supply passage 14 communicates is an insertion space 13 a for the exhaust sleeve 60. Further, the rear portion of the hollow portion where the end of the gas vent passage 12 communicates forms a detection passage 13b.
[0030]
In the air supply passage 14, the insertion space 13a of the exhaust sleeve 60, and the detection passage 13b described above, the pneumatic port 15, the exhaust port 16, and the detection port 17 are formed at the opening to the end face of the fixed gas vent block 10, respectively. ing. A female screw 15 a into which the pneumatic seal bush 70 can be screwed is formed on a part of the inner peripheral surface of the pneumatic port 15. Similarly, a female screw 16a into which the exhaust seal bush 80 can be screwed is formed in part on the inner peripheral surface of the exhaust port 16, and the detection seal bush 90 can be screwed into the inner peripheral surface of the detection port 17. An internal thread 17a is formed in a part.
[0031]
The pneumatic seal bush 70 is formed in a cylindrical shape, and a male screw 70a that is screwed into the female screw 15a is formed on a part of the outer peripheral surface. Further, a concave groove is formed in the circumferential direction on the outer peripheral surface of the pneumatic seal bush 70, and a peripheral surface seal portion 72 is formed by mounting a seal member 71 such as an O-ring in the concave groove. Further, a concave groove is formed on the outer end surface of the pneumatic seal bush 70 so as to surround the opening of the hollow portion 73, and the end surface seal portion 75 is formed by attaching a seal member 74 such as an O-ring to the concave groove. Is formed. Further, the hollow portion 73 of the pneumatic seal bush 70 forms a screw operation portion 76 with an inner wall formed in a hexagonal shape from the opening to a certain depth. A tool such as a hexagon wrench can be fitted to the screw operation portion 76, and the pneumatic seal bush 70 can be rotated by using these tools.
[0032]
The detection seal bush 90 is configured in substantially the same manner as the pneumatic seal bush 70. That is, the detection seal bush 90 is also formed in a cylindrical shape, and a male screw 90a that is screwed with the female screw 17a is formed on a part of the outer peripheral surface. A concave groove is formed in the circumferential direction on the outer peripheral surface of the detection seal bush 90, and a peripheral seal portion 92 is formed by mounting a seal member 91 such as an O-ring in the concave groove. Further, a concave groove is formed on the outer end surface of the detection seal bush 90 so as to surround the opening of the hollow portion 93, and an end surface seal portion 95 is formed by attaching a seal member 94 such as an O-ring to the concave groove. Has been. Furthermore, the hollow portion 93 of the detection seal bush 90 has a hexagonal inner wall from the opening to a certain depth, and constitutes a screw operation portion 96. A tool such as a hexagon wrench can be fitted to the screw operation portion 96, and the detection seal bush 90 can be rotated with these tools.
[0033]
The exhaust seal bush 80 is configured in substantially the same manner as the pneumatic seal bush 70 and the detection seal bush 90. That is, the exhaust seal bush 80 is also formed in a cylindrical shape, and a male screw 80a that is screwed with the female screw 16a is formed on a part of the outer peripheral surface. On the outer peripheral surface of the exhaust seal bush 80, a concave groove is formed in the circumferential direction, and a peripheral surface seal portion 82 is formed by attaching a seal member 81 such as an O-ring to the concave groove. Further, a concave groove is formed on the outer end surface of the exhaust seal bush 80 so as to surround the opening of the hollow portion 83, and an end surface seal portion 85 is formed by attaching a seal member 84 such as an O-ring to the concave groove. Has been. Further, the hollow portion 83 of the exhaust seal bush 80 has a hexagonal inner wall formed from the opening to a certain depth to constitute a screw operation portion 86. A tool such as a hexagon wrench can be fitted to the screw operation portion 86, and the exhaust seal bush 80 can be rotated with these tools.
[0034]
Further, the hollow portion 83 of the exhaust seal bush 80 is formed with a female screw 83a on the inner peripheral surface. A circular exhaust sleeve 60 is screwed into the female screw 83a. That is, the exhaust sleeve 60 is formed with a male screw 60a that is screwed into the female screw 83a on a part of the outer peripheral surface. The male screw 60 a is formed in a spiral direction opposite to the male screw 80 a formed on the outer peripheral surface of the exhaust seal bush 80. The female screw 83 a formed in the hollow portion 83 of the exhaust seal bush 80 is formed in a spiral direction opposite to the female screw 16 a formed on the inner peripheral surface of the exhaust port 16. Therefore, when the exhaust sleeve 60 is screwed into the exhaust seal bush 80, there is no possibility that the exhaust seal bush 80 is rotated around.
[0035]
The exhaust sleeve 60 is screwed into the exhaust seal bush 80, the tip portion is disposed in the insertion space 13a in the fixed gas vent block 10, and the hollow portion 61 forms an exhaust passage. The hollow portion 61 of the exhaust sleeve 60 has a hexagonal inner wall formed from one end opening to a certain depth to constitute a screw operation portion 62. A tool such as a hexagon wrench can be fitted to the screw operation portion 62, and the exhaust sleeve 60 can be rotated with these tools.
[0036]
The nozzle 50, the seal bushes 70, 80, 90, and the exhaust sleeve 60 described above are incorporated into the fixed gas vent block 10 in the following procedure.
First, the nozzle 50 is disposed at an intermediate portion of the hollow portion 13 formed inside the fixed gas vent block 10. Next, the pneumatic seal bush 70 is screwed into the pneumatic port 15, the exhaust seal bush 80 is fitted into the exhaust port 16, and the detection seal bush 90 is fitted into the detection port 17. At this time, each seal bush 70, 80, 90 is screwed and arranged inside the outer end face of the fixed gas vent block 10 (see FIG. 5). In this state, the seal members 74, 84, 94 constituting the end surface seal portions 75, 85, 95 are also arranged on the inner side of the outer end surface of the fixed gas vent block 10.
[0037]
Next, the fixed gas vent block 10 is fitted into the recess 101 formed in the fixed mold 100 (see FIG. 6). At this time, the seal members 74, 84, 94 constituting the end face seal portions 75, 85, 95 of the seal bushes 70, 80, 90 are arranged on the inner side of the outer end face of the fixed gas vent block 10 as described above. Therefore, there is no possibility that these seal members 74, 84, 94 interfere with the fixed mold 100, and therefore the seal members 74, 84, 94 become an obstacle and the fixed degassing block 10 cannot be fitted to the fixed mold 100. It is possible to avoid such inconveniences in work and damage due to interference of the seal members 74, 84, and 94 with the fixed mold 100.
[0038]
As shown in FIG. 6, an air supply hole 110, an exhaust hole 111, and a detection hole 112 are formed in the fixed mold 100 in advance, and the fixed gas vent block 10 fitted in the fixed mold 100 is empty. The pressure port 15 is positioned so that the air supply hole 110, the exhaust port 16 communicate with the exhaust hole 111, and the detection port 17 communicates with the detection hole 112, respectively.
[0039]
After the fixed degassing block 10 is fitted and mounted in the recess 101 formed in the fixed mold 100, a tool such as a hexagon wrench is attached to each of the seal bushes 70, 80, 90 through the air supply hole 110, the exhaust hole 111, and the detection hole 112. The seal bushes 70, 80, and 90 are engaged with the screw operation portions 76, 86, and 96, and are rotated in the direction of being extracted from the ports 15, 16, and 17. When the seal bushes 70, 80, 90 move outward from the inside of the ports 15, 16, 17 in accordance with the rotation operation, the end face seal portions 75, 85, 95 of the seal bushes 70, 80, 90 are moved. The sealing members 74, 84, and 94 constituting the abutment abut against the inner wall of the concave portion 101 formed in the fixed mold 100. Thereby, between each port 15,16,17 and the fixed metal mold | die 100 is sealed reliably.
[0040]
Thereafter, the exhaust sleeve 60 is screwed into the hollow portion 83 of the exhaust seal bush 80 through the exhaust hole 111 formed in the fixed mold 100. This operation can be easily and accurately performed by engaging a tool such as a hexagon wrench with the screw operation portion 62 formed on the exhaust sleeve 60. The distal end portion of the exhaust sleeve 60 screwed into the exhaust seal bush 80 is disposed in an insertion space 13a formed inside the fixed gas vent block 10 as shown in FIG. 7B, a narrow gap D is formed between the front end opening of the exhaust sleeve 60 and the front end of the nozzle 50. As shown in FIG. The narrow gap D can be arbitrarily set by finely adjusting the screwing amount of the exhaust sleeve 60.
[0041]
The narrow gap D and the nozzle 50 constitute a negative pressure generating part A. That is, as will be described later, the compressed air supplied through the air supply passage 14 passes through this narrow gap D and is discharged into the hollow portion 61 (that is, the exhaust passage) of the exhaust sleeve 60. Based on the theorem, the hollow portion of the nozzle 50 is depressurized to a negative pressure. This negative pressure acts as a suction pressure on the gas vent passage 12 or the hot water spray prevention passage 30.
The mold degassing apparatus of the present embodiment sucks the gas remaining in the mold cavity 300 with the negative pressure generated in the negative pressure generating part A in this way, and the hollow part of the nozzle 50 from the degassing passage 12. In this manner, the exhaust sleeve 60 is discharged to the hollow portion 61 (that is, the exhaust passage).
[0042]
As shown in FIG. 8, a pneumatic line coupler 120 is attached to the outer opening of the air supply hole 110 formed in the fixed mold 100. As shown in FIG. 9, the air supply source 121 is connected to the pneumatic line coupler 120 via the control box 122. The compressed air from the air supply source 121 is supplied to the air supply hole 110 under the control of the control box 122. A silencer 130 is attached to the outer opening of the exhaust hole 111 formed in the fixed mold 100 to reduce exhaust noise.
[0043]
As shown in FIG. 8, a detection line coupler 140 is attached to the outer opening of the detection hole 112 formed in the fixed mold 100. As shown in FIG. 9, a pressure sensor 141 is connected via a detection line coupler 140. Therefore, the pressure fluctuation in the hollow portion of the nozzle 50 is detected by the pressure sensor 141 through the detection passage 13b and the detection hole 112.
[0044]
Next, the operation of the pressure sensor 141 will be described.
First, when the gas in the cavity 300 is sufficiently sucked and discharged through the corrugated hot water spray preventing passage 30, the vacuum pressure in the hollow portion of the nozzle 50 is stable at a constant value.
On the other hand, the molten metal overflows to reach the gas vent passage 12 and closes the passage 12, or cast burrs remain in the corrugated hot water spray prevention passage 30 or the hot water spray prevention passage 30. In the case where metal oxides or fine powders are deposited together with the release agent, it becomes an obstacle, leading to a state where the gas in the cavity 300 cannot be sucked and discharged. At this time, since the vacuum pressure in the hollow portion of the nozzle 50 rises significantly compared to the normal value, the pressure sensor 141 detects this pressure change, so that a malfunction can be quickly found and appropriate measures can be taken.
[0045]
On the other hand, if a sufficient negative pressure does not occur due to a malfunction of the mold degassing device, a troublesome operation of the control box 122, or excessive dust accumulation on the silencer 130, the vacuum pressure in the hollow portion of the nozzle 50 is reduced. Since this pressure change is detected by the pressure sensor 141 because it is significantly lower than the normal value, it is possible to quickly find a malfunction and take appropriate measures.
[0046]
【The invention's effect】
As described above, according to the present invention, since the negative pressure generating part A is formed inside the fixed degassing block fitted into the fixed mold, a negative pressure is generated inside the mold, and therefore the mold is heated. Thus, the gas in the cavity can be efficiently exhausted without being affected by the expansion caused by.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an outline of a degassing apparatus for a mold according to an embodiment of the present invention.
FIG. 2 is a front view of a fixed gas vent block.
FIG. 3 is a front view of a movable gas vent block.
FIG. 4 is an exploded front sectional view showing an internal structure of a fixed gas vent block.
FIG. 5 is a front sectional view showing the internal structure of the fixed gas vent block during assembly.
FIG. 6 is a partial cross-sectional front view showing a state in which a fixed gas vent block is fitted in a fixed mold.
FIG. 7 is a front sectional view showing the internal structure of the fixed gas vent block after assembly.
FIG. 8 is a front view showing an external configuration of a fixed mold in which a fixed gas vent block is fitted.
FIG. 9 is a block diagram of equipment related to a fixed degassing block.
[Explanation of symbols]
10: Fixed degassing block
11: ridge
12: Gas vent hole
13: Hollow part
13a: Exhaust sleeve insertion space
13b: Detection path
14: Air supply passage
15: Pneumatic port
15a: female thread
16: Exhaust port
16a: female thread
17: Detection port
17a: female thread
20: Movable degassing block
21: concave
22: Extrusion pin
23: Deep groove
24: Pin
30: Hot water spray prevention passage
31: Molten metal trap
40: Nipple
41: Tapered hole
50: Nozzle
60: exhaust sleeve
60a: male screw
61: Hollow part (exhaust passage)
62: Screw operation part
70: Pneumatic seal bush
70a: male screw
71: Seal member
72: peripheral seal part
73: Hollow part
74: Seal member
75: End face seal part
76: Screw operation part
80: Exhaust seal bush
80a: Male thread
81: Seal member
82: peripheral seal part
83: Hollow part
83a: female thread
84: Seal member
85: End face seal part
86: Screw operation part
90: Detection seal bush
90a: Male thread
91: Seal member
92: peripheral seal
93: Hollow part
94: Seal member
95: End face seal part
96: Screw operation part
100: Fixed mold
101: Recess
110: Air supply hole
111: Exhaust hole
112: Detection hole
120: Pneumatic line coupler
121: Air supply source
122: Control box
130: Silencer
140: Detection line coupler
141: Pressure sensor
200: movable mold
201: recess
300: Cavity
301: Gas vent hole
A: Negative pressure generating part D: Narrow gap

Claims (6)

A fixed degassing block fitted into the fixed mold, and a movable degassing block fitted into the movable mold and brought into contact with the fixed degassing block when the same mold is closed. A degassing device for a mold in which a wave-shaped hot water spray prevention passage communicating with the mold cavity is formed,
The fixed vent block is inside,
A nozzle communicating with the hot water blowing prevention passage through a gas vent passage, and a narrow gap formed around the opening of the nozzle, and by flowing compressed air through the narrow gap, the inside of the hollow portion of the nozzle It has a negative pressure generator that turns negative pressure,
In addition, an air supply passage for guiding compressed air supplied from the outside to the narrow gap of the negative pressure generating portion, and the compressed air guided to the narrow gap of the negative pressure generating portion through the air supply passage to the fixed mold An exhaust passage for exhausting to the outside through the formed exhaust hole, and a circular exhaust sleeve attached to the fixed gas vent block, and the exhaust passage is formed by a hollow portion of the exhaust sleeve The narrow gap is formed between the tip of the exhaust sleeve and the open end of the nozzle,
Furthermore, a cylindrical exhaust seal bush having a male screw formed on at least a part of the outer peripheral surface,
The fixed gas vent block is formed with a hollow portion that is open to an end surface in contact with the fixed mold and into which the exhaust sleeve can be inserted,
At least a part of the inner peripheral surface of the opening of the hollow portion is screwed with a male screw formed on the outer peripheral surface of the exhaust seal bush, and the exhaust seal bush can be screwed inward from the end surface of the fixed gas vent block. A female thread is formed,
In addition, the exhaust seal bush moves outward from the end face of the fixed degassing block with a screw operation portion for rotating the male screw through an exhaust hole formed in the fixed mold. And a degassing device for a mold, comprising: a seal portion that is in pressure contact with the fixed mold . In the degassing apparatus for metal molds of Claim 1 ,
On the outer peripheral surface of the exhaust sleeve, a male screw is formed at least in a spiral direction opposite to the male screw formed on the outer peripheral surface of the exhaust seal bush,
In addition, a gas venting device for a mold according to claim 1, wherein a female screw is formed on the inner peripheral surface of the exhaust seal bush to engage with a male screw formed on the outer peripheral surface of the exhaust sleeve. In the degassing apparatus for metal mold | dies as described in any one of Claim 1 or 2 ,
A cylindrical pneumatic seal bush having a male screw formed on at least a part of the outer peripheral surface,
The air supply passage opens at an end surface of the fixed gas vent block contacting the fixed mold, and communicates with an air supply hole formed in the fixed mold through the opening.
At least a part of the inner peripheral surface of the opening of the air supply passage is screwed with a male screw formed on the outer peripheral surface of the pneumatic seal bush, and the pneumatic seal bush is more inward than the end surface of the fixed gas vent block. The internal thread that can be screwed is formed,
The pneumatic seal bush includes a screw operating portion for rotating the male screw of the pneumatic seal bush through an air supply hole formed in the fixed mold, and the fixed degassing block according to the rotation operation. A mold degassing apparatus comprising: a seal portion that moves outward from the end face and press-contacts the fixed mold. In the degassing apparatus for metal molds according to any one of claims 1 to 3 ,
The fixed gas vent block communicates with the hollow portion of the nozzle inside and opens to an end surface in contact with the fixed mold, and is provided outside through a detection hole formed in the fixed mold from the opening. A gas venting device for a mold, wherein a detection passage connected to a pressure sensor is formed. The degassing apparatus for a mold according to claim 4 ,
A cylindrical detection seal bush having a male screw formed on at least a part of the outer peripheral surface,
The detection seal bush can be screwed inwardly from the end surface of the fixed degassing block by at least partly engaging with the external thread formed on the outer peripheral surface of the detection seal bush at the inner peripheral surface of the opening of the detection passage. A female thread is formed,
The detection seal bush includes a screw operating portion for rotating the male screw of the detection seal bush through a detection hole formed in the fixed mold, and an end surface of the fixed degassing block accompanying the rotation operation. A degassing apparatus for a mold, comprising: a seal portion that moves outward and press-contacts the fixed mold. In the degassing apparatus for molds as described in any one of Claims 1 thru | or 5 ,
The movable gas vent block is formed with a molten metal trap including a deep groove formed at a terminal portion of the hot water blowing prevention passage and a tapered pin extending from the inner bottom portion of the deep groove into the gas vent passage. A degassing device for a mold characterized by the above.

Images