JPH07116807A - Air vent block - Google Patents

Abstract

PURPOSE:To improve the stability of quality and to prevent the spouting accident of molten metal by providing a suitable and fixed vent skimmer for assuring good gas exhaust. CONSTITUTION:The most tip part of high speed flow of the molten metal together with exhaust gas in a cavity is flowed into a branching flow part 23 in an air vent block 10 from a runner communicated with the cavity and passed through a first gate 21 and straightly advanced to a second gate 19 through a molten metal pool part 20 and advanced into an angular groove part 18. The exhaust gas is passed through the angular groove part 18 and exhausted into the atmosphere from the opening part at the upper part of a passage and on the other hand, the most tip part of the molten metal flow advanced into the angular groove part 18 is solidified to close the zigzag gap t3, and the molten metal successively flowed is filled up in the molten metal pool part 20. In this case, the volume of the zigzag gap is adjusted so as to fill up the molten metal into the whole pool part after the time, in which the most tip part of the molten metal flow advances into the angular groove part 18 and solidifies in the zigzag gap t3. By this method, the spouting accident of the molten metal is prevented and the stability of the operation can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air vent for a die casting mold.

[0002]

2. Description of the Related Art Conventionally, it has been known that an air vent is formed in a die dividing surface in a die casting mold in order to discharge gas in a cavity. Fair fair 5-154
Japanese Unexamined Patent Publication No. 11 discloses a device relating to a device for adjusting the clearance dimension of an air vent. In this invention, when the vent clearance is constant, if the clearance is too large, the water spray will occur. It was made to solve the problem of occurrence, and when the melt temperature and the mold temperature are low, if the gas discharge is not good, porosity will easily occur but blown will not occur easily, on the contrary, the melt temperature and the mold Based on the condition that when the temperature is high, poor quality is unlikely to occur but hot water blowing is likely to occur, the working stroke of the cam block drive device that detects the molten metal temperature and the mold temperature and adjusts the vent clearance is configured. . As the prior art in the above publication, for the purpose of preventing porosity from being formed by gas and improving the bathing area,
It is described that it is known to provide a basin. This is also conventionally called overflow.

[0003]

By the way, the vent skimmer adjusting device adjusts the vent skimmer on the basis of the conditions relating to the melt temperature and the mold temperature as described above. Since it tries to control the contradictory alternative effects of prevention by detecting the constantly changing molten metal temperature and mold temperature, it may cause quality instability or blown water. There is an inherent problem of poor reliability of prevention. From this, it is considered that the bent skimmer should be rather constant.

Therefore, the present invention improves the stability of the quality by possessing a proper and constant vent skimmer that guarantees a good gas discharge, and also prevents the accidental outflow of the molten metal and ensures the work safety of the air vent. Intended to provide blocks.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an air vent block which is embedded in two halves in accordance with a dividing surface of the die for discharging gas in a cavity of the die casting die. In which a plurality of contiguous chevrons are machined along the mold dividing surface to form gaps t ₃ and mesh with each other to open one side to the atmosphere, and to connect to the other side of the chevron groove, A second gate having a plane parallel to the mold dividing surface and forming a gap t ₂ with t ₂ > t ₃ , a basin for connecting one side to the second gate, and a burying part for the basin In addition, an adjustment piece capable of adjusting the volume of the hot water pool portion by changing its thickness dimension is connected to the other side of the hot water pool portion in a straight line on the side opposite to the second gate, and t ₁ <t _A first gate forming a gap t ₁ which is ₂ ;
An air vent block is provided, which comprises: a first flow path connecting one side to the first gate and connecting a second side to a runner communicating with the cavity.

[0006]

When the cavity is filled with the molten metal, the leading edge of the high-speed flow of the molten metal together with the exhaust gas in the cavity flows from the runway communicating with the cavity into the flow dividing portion of the air vent block and passes through the first gate. Go straight through the pool to the second gate and enter the mountain groove. The exhaust gas passes through the chevron groove and is discharged into the atmosphere through the opening above. On the other hand, the leading edge of the molten metal flow entering the chevron groove solidifies and closes the meshing gap t ₃ , and subsequently the molten metal flowing into the molten metal pool. Is filled. In this case, ejection accidents melt and adjust its volume reliably as molten metal after the time-leading molten metal flow is solidified in a enters the groove chevron inner meshing clearance t ₃ is filled in the entire basin section To be prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the fixed mold 12 and the movable mold 13 are in a mold matching state, and the air vent block 10 divided into two parts according to the mold dividing surface 14 embeds the one side members 15 and 16, respectively, and partially It is fixed by the mounting bolts 17 shown.

Each of the one-side members 15 and 16 of the air vent block 10 is provided with a chevron groove portion 18 which meshes by forming a plurality of chevron surfaces which are continuous along the mold dividing surface 14 to form a gap t ₃ . The upper side is open to the atmosphere. On the other side of the chevron groove portion 18, there is provided a second gate 19 having a plane parallel to the mold dividing surface 14 and forming a gap t ₂ with t ₂ > t ₃ for connection. This second gate 1
9 is connected to one side of the basin 20. The basin 20 has an adjusting piece 21 buried therein so that its volume can be adjusted. Several kinds of adjusting pieces 21 having stepwise different thicknesses H are prepared, and the optimum one is selected from the results of the actual casting test. Although the adjusting piece 21 is embedded in the one-sided member 15 in the drawing, it is obvious that it may be embedded in the opposite one-sided member 16 side. A first gate 22 is connected to the other side of the pool 20 on the opposite side of the second gate 19 and forming a gap t ₁ in a straight line and having t ₁ <t ₂ . A diversion part 23 that connects one side to the first gate 22 is provided, and a runner 24 that communicates with a cavity (not shown) is provided on the other side of the diversion part 23.
Are connected. These have a width W in the width direction of the air vent block 10, as shown in FIG. 2 as a section AA in FIG. 1, and both side portions thereof form a contact surface. Reference numeral 25 denotes an extruding rod which works in conjunction with a known product extruding device (not shown).

The operation of the air vent block 10 having such a structure will be described. When the cavity is filled with the molten metal during die casting, the gas in the cavity is discharged accordingly, and subsequently, the high-speed flow of the exhaust gas and the high-speed flow of the molten gas communicate with the cavity from the runner 24 to the air vent block. It flows into the flow dividing portion 23 of 10 and spreads over the entire width W, passes through the first gate 22, passes through the molten metal pool portion 20 and goes straight to the second gate 19 to enter the chevron groove portion 18. The exhaust gas passes through the chevron groove portion 18 and is discharged into the atmosphere through the upper opening. On the other hand, the tip of the molten metal flow that has entered the chevron groove portion 18 solidifies and closes the meshing gap t ₃ . The molten metal that subsequently flows in is filled in the pool 20. In this case,
The leading edge of the molten metal flow enters the chevron groove 18 and the meshing gap t ₃
By adjusting the volume of the molten metal so that the molten metal fills the entire molten metal pool portion 20 after the solidification time, the accident of molten metal ejection can be reliably prevented.

[0010]

As described above, according to the air vent block of the present invention, the mountain-shaped groove portion which is embedded in two halves according to the mold dividing surface and which is continuous by forming a gap t ₃ along the mold dividing surface. Is connected to a second gate that forms a gap t ₂ with t ₂ > t ₃ , and a hot water pool portion in which an adjusting piece whose volume can be adjusted is buried is connected to the second gate, and further to this hot water pool portion. A first gate forming a gap t ₁ with t ₁ <t ₂ is connected, and a flow dividing portion connected to the first gate is connected to a runner communicating with the cavity. When the molten metal is filled, the exhaust gas in the cavity becomes a high-speed flow, passes through the chevron groove portion of the meshing gap t ₃ , and is discharged into the atmosphere from the upper opening. At this time, the molten metal flow that has entered the chevron groove portion. At the leading edge of solidifies and closes the meshing gap t ₃ . The volume of the molten metal that subsequently flows in is adjusted by adjusting the volume of the molten metal so that the molten metal fills the entire pool after the time when the tip of the molten metal solidifies in the meshing gap t _{3 of the} chevron groove. Of water is prevented.

Therefore, it is possible to improve the stability of quality by having a proper constant vent skimmer capable of assuring good gas discharge, and to prevent the accident of molten metal smelting and ensure work safety.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 10 Air Vent Block 12 Fixed Mold 13 Moving Mold 14 Mold Dividing Surface 15, 16 One Side Member 17 Mounting Bolt 18 Angle Groove 19 Second Gate 20 Hot Water Pool 21 Adjusting Piece 22 First Gate 23 Flow Dividing Section 24 Runway 25 Extrusion rod

Claims (1)

[Claims] 1. An air vent block which is embedded in two halves in accordance with a dividing surface of the die for discharging gas in a cavity of a die casting die, and a plurality of continuous chevrons are formed along the dividing surface of the die. It has a chevron groove portion that is ground to form a clearance t ₃ and meshes with one side to open to the atmosphere, and a flat surface connected to the other side of the chevron groove portion and parallel to the mold dividing surface t ₂ > t ₃ A second gate forming a gap t ₂ , which is a gap, and a hot water pool portion connecting one side to the second gate, and a volume of the hot water pool portion which is embedded in the hot water pool portion and whose thickness dimension is changed. An adjustable piece, and a first gate that is connected to the other side of the basin on the opposite side of the second gate in a straight line to form a gap t ₁ with t ₁ <t ₂ .
An air vent block, comprising: a first flow path connecting one side to the first gate and connecting a second side to a runner communicating with the cavity.