BÁO CÁO THIẾT KẾ CHẾ TẠO KHUÔN MẪU ĐỦ 25 BÀI_SPKT-17-EN

TOPIC: SYSTEM REMOVING UNDERCUT

GVHD: TRẦN MINH THẾ UYÊN
SVTH: NGUYỄN HOÀNG LINH
MSV: 12144060


CONTENTS PRESENTATION
INTRODUCE
UNDERCUT OUTSIDE

UNDERCUT INSIDE
UNDERCUT REN TRONG

UNDERCUT REN NGOÀI




TYPICAL UNDERCUT


UNDERCUT OUTSIDE


SYSTEM COMPONENTS


BASIC PARAMETERS OF CORE SLIDING

BOLTS


SLIDING


HÌNH DẠNG RAY DẪN


KHỐI NÊM


CALCULATION OF DATA
1 - traction:
During the injection molding and cooling, the plastic bag outside the core and
volume contraction. To disconnect power to win shrinkage and friction.
F = Pacos (f - tanα) / (1 + f sinα1 cosα1)
2. The angle of the oblique α key:
The magnitude of the oblique tilt latches not only involves bending force
closing of oblique and traction achieved, but also connected with
work of key length skewers, slip and trip distance open
mold. The angle α is usually chosen in the range of 12 ÷ 25 °


3 - Distance slider:
Pull the core out of the mold to the position where no human influence
push. The distance moved is called the slip distance. Usually, common, normal
creepage distances are measured by the depth of the hole should add about
securely usually 2 ÷ 3 mm.
S = H tan α + (2 ÷ 3)

Q: What is the open mold itinerary requested by closing the gap to complete
oblique slide (mm)
A: The closing angle of oblique
S: distance slide (mm)


4 - The diameter of the bottom oblique
The calculation formula for ending diagonal diameter
can be deduced from the mechanical material:
d = (Fb × L / 0.1 [σb] cos α) 1/3
Inside:
- Α: the angle of the oblique key
- Fb: bending force of closing the oblique (N)
- [Σb]: bending stress, usually 140 MPa for carbon
steel


5 - Calculation of key length
skewers
The length of the key workrelated slant L itinerary drawn S
core, the key oblique angle α and
β the angle formed by sliding and
parting lines. Β normal value is 0.
L1 + L2 + L = L3 + L4 + L5
= D2 / 2 mt α + h / cos α + d / 2 mt
α + s / sine α + (5 ÷ 10)


UNDERCUT INSIDE

BOLDS


BASIC PARAMETERS


SLIDING OF BOLTS CORE DESIGN OBLIQUE
The shallow concave surface of plastic
products require small gap withdraw
core, while the concave area big, big
draw core need. So closing the oblique
structure is added to the side and core
products withdrawn. Push key thrust of
the motion controller's tilt latch oblique
slip. Inclined surface and core of the
product withdrawal is completed by
closing the vertical oblique thrust and
remove the plate.


HYDRAULIC CYLINDER PUSH UNDERCUT


BY REMOVING PRINCIPLES CYLINDER


HỆ THỐNG REN TRONG

CÁC BƯỚC THÁO REN


REN NGOÀI