PRODUCT OVERVIEW EJECTOR SLEEVE
■ Ejector Sleeve and Center Pin Combination Example
■ Ejector sleeve (V + 0.01
0 / H7), fitting clearance range (maximum and minimum)
（ A ）
（ B ）
Center Pin Shaft Diameter (D or P) Tolerance
＋ 0.015 ＋ 0.01 ＋ 0.02 ＋ 0.025
0 ＋ 0.005 ＋ 0.01 ＋ 0.015 ＋ 0.02 ＋ 0.025 － 0.005 － 0.01 － 0.015 － 0.02 － 0.025
0 –0.005
–0.01 –0.02
①
①
+ 0.005 0
○ Suitable
○ Suitable
＋ 0.01
＋ 0.01 0
Because the clearance between the ejector sleeve and center pin is kept to 0.01mm and below, this is used in cases where the plastic is conducive to the development of burrs, and for precision molds.
Because the clearance between the ejector sleeve and the center pin is large, this is used in applications where smooth sliding is required. (*The hole diameter of the ejector sleeve can also be made 0.01mm larger.)
＋
0.005
, H7
, H7
V
V
0
Ejector sleeve hole diameter (V) tolerance
－ 0.02 － 0.025 － 0.015 － 0.01 － 0.005 0
(Precision class)
② ③
③ ②
Combination of the ejector sleeves and shaft diameter tolerance 0 –0.005 center pins is unsuitable, because fitting sections (S) of the ejector sleeve are longer and the contact area with the center pin is large. Please note that if the hole diameter and shaft diameter are specified with the same dimensions, problems such as the pin not entering the hole, the pin stopping in the middle of the hole, and sliding not being smooth may occur.
+ 0.01 0
－ 0.015 － 0.01
－ 0.01 － 0.02
D or P
× Unsuitable
○ Suitable
The minimum fitting clearance required between the ejector sleeve and center pin (0.01mm) can be achieved. This is widely used in general ap- plications, except for the resins that easily develop burrs.
D or P
① ...Hole diameter (V) ② ...Shaft diameter (D or P) ③ ...(Clearance)
and H7
(A) General combinations
(B) Combination to keep the maximum clearance value small
■ Fitting Clearance between Ejector Sleeve and Center Pin
Ejector sleeves
Center Pins
Center Pins
When shaft diameter (D or P) = hole diameter (V) –0.01 is designated in the center pin of the shaft diameter tolerance. 0 –0.005
(When the shaft diameter tolerance is –0.01 –0.02 ) When shaft diameter (D or P) = V is designated
• The figure on the left shows sleeve fit, when the same dimensions have been specified for ejector sleeve hole diameter (V) and center pin shaft diameter (D or P). • MISUMI ejector sleeves and center pins are produced separately, with tolerance control exercised on each (with the exception of set products). For this reason, the minimum clearances indicated below are necessary.
① Hole diameter range
② Shaft diameter range
③ Clearance Range
② Shaft diameter range
③ Clearance Range
V + 0.01 0 V + 0.012 0 V + 0.015 0 V + 0.018 0
0.01–0.025 0.01–0.027
0.01–0.03
0.01–0.032 0.01–0.035 0.01–0.038
–0.01 –0.015
–0.01 –0.02
① ...Ejector sleeve hole diameter (V) ② ...Center Pin Shaft Diameter (D or P) ③ ...Fitting Clearance between Ejector Sleeve and Center Pin
( D or P )
( D or P )
0.01–0.03
0.01–0.033
• In order to keep the maximum value of the fit clearance smaller than that of "(A) Normal combination", first, a straight center pin with a SKH51 tolerance 0 –0.005
● Hole diameter (V) + 0.005 0
● Hole diameter (V) + 0.01
and shaft diameter (D or P) 0 –0.005
–0.01 –0.02
0 /H7 and shaft diameter (D or P)
shaft diameter of 0.01mm is specified. Alternatively, if you
select the stepped center pin and specify the shaft diameter or tip diameter 0.01mm smaller than the hole diameter (V), this results in "(B) Combination to minimize the maximum clearance value". • In addition, SKD61 + Nitriding product group also includes an ejector sleeve and center pin set that holds clearance to under 0.03mm.
combination
combination
■ Ejector Sleeve Recessed Hole (C)
● Ejector sleeve
● Cross-sectional view when the center piece is seated
S Hole diameter （ V ） H7
S
（ V ）
＋ 0 . 01 0
Hole diameter （ V ） ＋ 0 . 005 0
Hole diameter
•The ejector sleeves have been designed to be used in combination with the center pins. Smooth sliding will not be possible if the fit section of the hole diameter (V) is too long for the center pin. This is why the length of the hole diameter (V) has been designed to be (S), while the remainder of the length (L–S) is recessed as the recessed hole (C).
V ≦ 3.0
3.1 ≦ V ≦ 6.0 6.1 ≦ V ≦ 10.0 10.1 ≦ V ≦ 16.0
－ 0.025 － 0.02 － 0.015 － 0.01 － 0.005 ＋ 0.005 ＋ 0.01 ＋ 0.015 ＋ 0.02 ＋ 0.025 0
＋ 0.005 ＋ 0.004 ＋ 0.003 ＋ 0.002 ＋ 0.001 － 0.001 － 0.002 － 0.003 － 0.004 － 0.005 0
＋ 0.005 0
①
＋ 0.018
V
＋ 0.015 0
①
0 ＋ 0.012
＋ 0.01
＋ 0.01
0 V
V
V
0 V
V 0
（ L － S ）
S
Fitting part
③
Relief area
③ ②
L
（ D or P ） － 0 . 005 0
－ 0 . 01 － 0 . 02
②
Shaft diameter
Shaft diameter （ D or P ）
• The recessed hole (C) is only applied with rough finishing. The precision standards regard a product acceptable if the corresponding straight center pin is able to pass through the sleeve. ● Precision Standards for the Ejector Sleeve Recessed Hole (C)
+ 0.005 0
+ 0.01 0
V
V
and V H7
① Ejector sleeve hole diameter (V) tolerance range ② Center pin shaft diameter (D or P) tolerance range ③ Minimum clearance value ( = 0) required for the center pin to pass through the ejector sleeve. E Refer to "Pass-through Test Standards" given below.
① Ejector sleeve hole diameter (V) tolerance range ② Center pin shaft diameter (D or P) tolerance range ③ Minimum clearance value ( = 0.01mm) required for the center pin to pass through the ejector sleeve.
Recessed hole (C) precision standards and test methods
• Precision standard: When the center pin shaft diameter (D or P) = the sleeve hole diameter (V), the appropriate corresponding straight center pin (shaft diameter tolerance –0.01 –0.02 ) should pass through the sleeve. • Test method: Inserting a pass–through test pin. E Please note that when a shaft diameter tolerance 0 –0.005 center pin is inserted, there may be instances in which the pin will not pass through the recessed hole (C), even though it passes through the hole diameter (V).
• Precision standard: When the center pin shaft diameter (D or P) = the sleeve hole diameter (V), the appropriate corresponding straight center pin (shaft diameter tolerance 0 –0.005 ) should pass through the sleeve. • Test method: Inserting a pass-through test pin.
■ Pass-Through Test Standards for the Ejector Sleeve ● Hole diameter (V) + 0.005 0
+ 0.01 0
● Hole diameter (V)
, H7
C = V + 0.5 C ± 0.1 ※ C designation type C ≧ V + 0.5 C ± 0.1
Recess hole (C) size and precision (reference)
Deflection of C: 0.1mm/100mm (reference value) Concentricity of C against V: 0.2mm (reference value)
Deflection of C: 0.1mm/100mm (reference value) Concentricity of C against V: 0.2mm (reference value)
C = V + (0.2–0.4) C ± 0.1
→
→
Pin through hole
Pin through hole
● Precautions when Inserting a Stepped Center Pin's Shaft Diameter (D) into an Ejector Sleeve's Recessed Hole (C)
+ 0.01 0 ejector sleeve, with its long sleeve section S dimensions fit section,
Test using a pass–through test pin
• The H7 hole diameter (V)
C ≧ D + 1.0
CW ≧ D + 1.0
is –0.01 –0.02 used in combination with shaft diameter tolerance center pin. Because a shaft diameter tolerance –0.01 –0.02 center pin must pass through, the sleeve is tested by inserting a (V) –0.006 –0.007 pass- through test pin from the head side of the sleeve. E Note that troubles may arise in which shaft-diameter tolerance 0 –0.005 center pins do not fit the holes, the pins stop partially into the holes and sliding is not smooth due to the length of the sleeves section (S) of the ejector sleeves.
• The precision standard of the recessed hole (C) is tested by inserting the appropriate standard pass-through test pin during pass-through and fit testing. The sole test standard here is whether the appropriate corresponding straight center pin passes through the sleeve hole diameter (V). For this reason, C ≧ (D + 1.0) is necessary in order to be able to insert a stepped center pin's shaft diameter (D) into the recessed hole (C) without problem. Please take note of this. The 2-stage recessed hole (when using CW codes) is CW ≧ (D + 1.0).
+ 0.005 0
• The hole diameter (V)
ejector sleeve, with its long sleeve section S dimensions fit section, is
used in combination with shaft diameter tolerance 0
–0.005 center pin.
Because a shaft diameter tolerance 0 –0.005
center pin must pass through, the sleeve is tested by
0 –0.005 pass-through test pin from the head side of the sleeve.
inserting a (V)
219
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