GUIDE FOR ROLLING GATE CUT UNITS
● Mold opening amount and gate rotation angle ■ Installation
■ Overview ● What is rolling gate cut unit? This unit is designed to rotate the rotary gate pin to cut the side gate by using the mold opening movement.
● How to adjust gate position
Mold opening amount ST and rotation angle Mold opening amount ST Rotation angle θ D16 D20 1 5.0 4.0 2 10.0 8.0 3 15.1 12.0 4 20.1 16.1 5 25.1 20.1 6 30.1 24.1 7 35.1 28.1 8 40.1 32.1 9 45.2 36.1 10 50.2 40.1 11 55.2 44.2 12 60.2 48.2 13 65.2 52.2 14 70.2 56.2 15 75.3 60.2 16 80.3 64.2 17 85.3 68.2 18 90.3 72.3
● Characteristics • Since gate section of the side gate is larger than that of pin gate and oblique gate, it can effectively apply holding pressure. Therefore, traction preven- tion, dimensional stability and appearance transcription are improved. • Labor cost can be significantly reduced by automation of gate cut operation. • Gate cut sections are uniform to avoid unstable hand cutting. In addition, generation of dust during gate cutting can be repressed.
Rotating gate pin
● How to operate rolling gate cut unit
Movable side cavity insert
Spacer
Coil spring
Clamp
Shoulder bolt
（Ⅰ） （Ⅱ）
（Ⅰ）
（Ⅱ）
Movable side plate
Fixed ring
Sprue bushings
Hexagon socket head bolt
Movable side support plate
Hexagonal wrench
Products and side gate
Return pin stopper MWZC etc.
For angle adjustment, insert a hexagonal wrench to the end of the rotation gate pin with the Movable die plate and Movable plate closed, rotate it to adjust the gate position and fix the gate pin with socket head cap screw and clamp.
● Installation hole processing example
with return pin tap hole
Rotating gate pin
Support plate Movable side plate Selection side plate Fixed side die plate
Movable side die plate
Spacer block
1) In forming Resin flows through runner and side gate engraved on the rotation gate from sprue to form the product.
3) Mold opened Operation of PL surface ( Ⅰ ) is limited by the shoulder bolts and the PL surface ( Ⅱ ) is opened.
P
φ 6.6
● Gate shape example
A-A cross section
φ C3 ＋ 0.5
Coil spring
Shoulder bolt
Fixed ring
Ejector guide P&B
＋ 0.01 0
（Ⅰ） （Ⅱ）
（Ⅰ）
（Ⅱ）
φ D
Movable side cavity insert
A
A
φ D ＋ 0.2
Side gate
Jump gate
Movable side plate
A
A
Movable side support plate
Disconnected gate
＋ 0.2 0
φ D
Seat grid for M6
A-A cross section
Mold opening amount ST
B ≧ 2 + B 1 + H 1 B 1 : Start position of groove from top of the head of the rotation gate pin H 1 : Length from the bottom of fixed ring to the steel ball Provide an allowance of 2mm or more in the groove start position of the fixed ring steel ball and rotation gate pin.
Rotating gate pin
Examine your own runner/gate shapes in accordance with each resin.
2) In gate cutting • The PL surface ( Ⅰ ) is opened by opening of the moving side and coil spring. • By rotating ( θ degree) the gate pin with steel ball in the fixed ring and pin's spiral groove using mold opening (ST) of the PL surface ( Ⅰ ), it cuts the side gate.
4) When product is ejected Ejector plate is ejected and the product, runner and sprue are removed.
D LA F 16 25–40 15.5
h
C3
P
9.5
25 31
34 40
20 35–60 18.5 12.5
• Notes 1) This is a unit to cut the gate by rotating gate pins by means of mold opening of ( Ⅰ ) before the product PL surface ( Ⅱ ). Since this is a special structure, be sure to use the following parts : • Coil spring ･･･････････ Use coil springs and parting lock to ensure that the PL surface ( Ⅰ ) is opened first. • Shoulder bolt ･････････ Used for the product PL surface ( Ⅱ ) to open. • Return pin stopper ･････ Interlocks and operates the moving side plate and ejector plate when the PL( Ⅰ ) is opened. Without interlocking, the product and ejector pin tip are separated by the opening amount. The product may be whitened when the ejector rod contacts with the product again. • Ejector leader pin/bushing ･･･････ Necessary to stabilize the rotation gate cut unit operations. 2) Do not use Z pin. Otherwise operation of rotation gate cut pin is interrupted.
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