FREE FLANGE-POSITION EJECTOR PINS
■ Range of guaranteed shaft diameter (P) precision Length (b 1 )
■ Guaranteed range of base material hardness
Straight Ejector Pins
Stepped Ejector Pins Rectangular Ejector Pins
L dimension designation type L/P dimension designation type
Shape
b 2 (Guaranteed range of base material hardness)
b 1
4
4
4
4
P
S
L
S
L
S
L
N
Classification
No annealing (Overall quenching)
S
L
T
R
S
L
L
Tip diameter (P) Tolerance
Head Thickness (T)
Material
Part Number Page Part Number Page Part Number Page Part Number Page
b 2 = L + S
b 1 ≧ L−T−R−5
＊ R is the size of R below the flange.
Hardness
58–60HRC
H
■ Characteristics Free flange position ejector pins make an ejection with time difference possible. The depth of counter bore Z (Fig.1) make an ejection slower than the other ejector pins. They are applicable to ejection of molded products and two-step ejection.
0 – 0.005
EPSH
EPSHB
EPSHS
–
P.147
P.147
P.149
– 0.01 – 0.02
EPSHE
EPSHBE
EPSHSE
–
SKH51
Example
P/W 0 – 0.005
4mm (T4)
ERSH
–
–
–
Submarine gate
Molding products
Fixed die plate
Runner
P.159
P/W 0 – 0.01
Molding products
ERSHE
–
–
–
Runner
Runner
Cavity
P.L.
P.L.
P.L.
SKD61 + Nitriding
– 0.01 – 0.02
EPSN
EPSNB
–
–
P.148
P.148
Core
Movable die plate
Straight Ejector Pins with Tip Process
Stepped Ejector Pins with Tip Process
Pusher Pins with Spring Guide
L dimension designation type L/P dimension designation type
Shape
Upper ejector plate
4
4
3
4
S
L
S
L
L
N
Classification
S
L
Z
※ Head thickness (T) = 3
Lower ejector plate
Tip diameter (P) Tolerance
Head Thickness (T)
Material
Part Number Page Part Number Page Part Number Page Part Number Page
Base clamping plate
EPSHB □ A
EPSH □ A
EPSHS □ A
0 – 0.005
EPCH
Fig. 1 ● Mold closed
Fig. 2 ● Mold opening
Fig. 3 ● Mold opened
4mm (T4)
P.155
P.155
P.157
P.161
SKH51
EPSHE □ A
EPSHBE □ A
EPSHSE □ A
Fixed die plate
– 0.01 – 0.02
EPCHE
Molding products
Locating ring
Cavity
Runner
Molding products Runner
Fixed installation plate
Runner
Molding products
P.L.
P.L.
P.L.
■ Material characteristics of ejector pins
Dies Steel SKD61 + Nitriding : 900HV– Base Material: 40–45 Surface
(Pre-hardened) Die Steel SKD61
Stainless Steel SUS440C
High Speed Steel SKH51
Die Steel SKD61
M Material
Core
Movable die plate
H Hardness HRC
58–60
50–55
40–45
56–60
Wear resistance
5 4 3 3
4 4 5 3
4 3 4 3
3 3 4 3
4 4 3 5
Machining Characteris- tics
Specularity Toughness
Upper ejector plate
Corrosion resistance
Runner
Density
[g/cm 3 ]
8.2
7.75
7.75
7.75
7.78
Modulus of longitudi- nal elasticity Coefficient of thermal expansion Thermal conductivity coefficient
[kgf/mm 2 ]
22300
21000
21000
21000
20400
Physical Characteris- tics
Lower ejector plate
[ × 10 -6 /K(°C)]
10.1
10.8
10.8
10.8
10.2
[cal/cm ・ sec ・ °C]
0.051
0.061
0.061
0.061
0.058
Tensile strength
[kgf/mm 2 ]
235
135
135
135
200
Base clamping plate
Mechanical Characteris- tics
Charpy impact values [kgf ・ m/cm 2 ]
2
6
4
4
1.5
1kgf/mm 2 = 9.81N/mm 2 1cal/cm ・ sec ・ °C = 418.4W/m ・ K 1kgf ・ m/cm 2 = 9.81J/cm 2
1
3
5
E This document shall be used as a guideline, since the data is subject to change depending on the heat treatment and usage conditions.
Machining characteris- tics
Conver- sion formula
143
144
(Poor)
(Good)
(Excellent)
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