THIẾT TRÌNH THIẾT KẾ CHẾ TẠO KHUÔN MẪU ĐỦ 25 BÀI_15_EN

Hệ thống thoát khí (vent in injection mold)


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Tasks and technical requirements

exhaust system that provides multiple paths to air trapped in the cavity to escape quickly and
easily.

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Exhaust system must designed so that air can escape easily, but not for hot asphalt
When no, it will cause some serious defects flowing passing.


2. THE TYPE exhaust
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+ Escape exhaust air through grooves on the parting
+ Exit push air through the system on campus
+ Escape channel system with gas
+ Escape gas through the vacuum system.
+ Escape thonglam cool air through, insert, slide,

. Free exhaust on the parting


Rãnh dẫn(vent land)


DEEP


Rãnh thoát(relief slot)


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Groove exhaust layout in locations waste generated by the air escape, such as air holes,
burns, ...

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In addition, a different solution that is machined annular channel, the air will follow
the surrounding air escape hole.


The layout


Number of necessary ventilation grooves
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Total perimeter drains close to 30% gas circumference of the details to ensure the

exhaust.


b. Exhaust system on canal
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-To Increase the ability of exhaust out cavity so arranged exhaust system more on the
channel.


Exit push air through the system in the mold


The layout


Exhaust via vacuum system


Vacuum system on site


d.Thoat air through cooling systems, slide, insert ...

-Đối với những chi tiết có gân, việc dùng rãnh ở mặt phân khuôn
hay
ty đẩy đều không khả thi


Application

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- For details ribbed, taking on the parting groove or push companies are not feasible, the plan
was made to use a cavity insert style to take advantage of the gap between the two pieces to
assemble layouts groove exit.


The parameters necessary for the design of exhaust
channels:


The parameters to be calculated
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+ The depth of the runner: d
+ Length runner: l
+ The width of the runner: W
+ The depth of the drain D = 20d
+ The required exhaust groove
The perimeter of the first exhaust groove: a = 2 (W + D)
Number of grooves exhaust X: there X.a