ALTERATION GUIDE FOR SPRUE BUSHINGS
■ Alteration of flange part Items Codes
■ Runner Groove Machining Items
Spec.
Spec.
Select the runner groove shape, groove dimension and groove type.
Adds a flat on the flange part. Designation method KC8.5 Designation dimensions 0.5mm increments E Use for key slotting or for preventing interference with other parts. X Not available for extension type/press fit type Adds two flats in parallel on the flange part. Designation method WKC6 Designation dimensions 0.5mm increments E Use for key slotting or for preventing interference with other parts. X Not available for extension type/press fit type
Codes
Type
Codes
Type
Runner groove shape
groove dimension
KC
X Combination with BC not available X Combination with NC/KP not available X Not available for string eliminator type
R0.5
● W dimension/GC°selection W t GC° 3 2.5
AIW
AHW
Flange cutting
GC °
AXW
4 3 5 3.5 6 4 8 5.5
WKC
X Combination with BC not available X Combination with NC/KP not available X Not available for string eliminator type
Shape A (Trapezoid)
7° 10°
ATW
AJW
Adds 2 bolt holes. (4 holes in total) Designation method BC (Supplied bolts: 4) E Available for Normal bolt type/Old JIS A type X Combination with KC/WKC not available X Combination with KP not available
t
10 7
Alternation of No. of bolt holes
AKW
AEW
BC
X Combination with ZC not available X Combination with RC not available E For ATW, AJW, ALW and APW, there are working limits as follows. when D ≦ 10, ( α –0.6) ≧ W when D ≧ 12 ( α –0.4) ≧ W E T he trapezoidal taper angle (GC°), which was previously fixed at 10°, is now selectable from 10° and 7°. Designation method AIW6 – GC7 Specify in the sequence “(shape)(W dimension) – GC”. If you do not specify GC, (AIW6) is always 10°.
ALW
APW
Bolt hole is not processed. Designation method BN (No supplied bolt) E Available for normal bolt type/old JIS A type M material S45C, HPM1 equivalent material
Alteration to no bolt hole
BN
AUW
ACW
BIR
BHR
● R dimension selection 1 1.25 1.5 1.75 2 2.25 2.5 3 3.5 4
Adds a dowel hole. Designation method NC E Available for Normal bolt type/Old JIS A type X Combination with KC/WKC not available X Not available for press fit type
φ 4 × 6
NC
Shape B (Semicircle)
R
BXR
Runner groove machining
BTR
BJR
φ 6H7
Adds a dowel hole (longitudinal). Designation method KP
Dowel hole boring
E Available for equivalent of HPM1 only X Not available for press fit type X Combination with KC/WKC not available X Not available for string eliminator type X Combination with NC not available X Combination with BC not available
BER
BKR
KP
K
X Combination with ZC not available X Combination with RC not available E BTR/BJR/BLR/BPR have working limits as follows.
: K = 15mm : K = 19mm : K = 24.5mm : K = B/2mm
※ The position of dowel hole boring (longitudinal) is half a position from the center of the pitch dimension between bolts.
For 10mm head For 15mm head For 20mm head
BLR
BPR
E The effective length of dowel hole is 10mm below the under – head part (recessed hole φ 6.5)
when D ≦ 10, ( α– 0.6) ≧ 2 × R when D ≤ 12, ( α– 0.4) ≧ 2 × R Designation method BXR3
For old JIS A
■ Tip Tapering Angle Processing Items Codes
BUR
BCR
Spec.
● Q dimension selection 2 2.5 3 3.5
CIQ
CHQ
Changes the range of G tolerance. G ° 0 – 30 ′ c G ° 0 – 15 ′ X Combination with undercutting (ZC) not available X Extension type not available. Designation method GKC E Available for tapered type when ℓ ≦ 15 and (L – ℓ) ≧ 10 ℓ = D – V 2tan(G° – 0.25°) ※ 0.25° is a value that takes G tolerance into account.
5 °
GKC
Range alteration of G angle tolerance.
CXQ
GKC
Shape C (Arc+Tangent)
ℓ
4 5 6 8
CTQ
CJQ
■ L Dimension Processing Items Codes
Q
CKQ
CEQ
Spec.
X Combination with ZC not available X Combination with RC not available E C TQ, CJQ, CLQ and CPQ have working limits as follows.
L dimension can be designated in 0.1mm increments. Finishes with a + 0.1 0 L dimension tolerance range. Designation method SBBP – B13 – LC75.3 – A2 E Available for fixed L dimension type only E When combination with LKC, L dimension can be designated in 0.01mm L dimension can be designated in 0.01mm increments. (For fixed L dimension type, it can be designated in 0.01mm increments only when combination with LC.) Finishes with a 0 – 0.02 L dimension tolerance range. X Combination with undercutting (ZC) not available Designation method SBBP13 – 85.25 – SR11 – P3.5 – A2 – LKC
CLQ
CPQ
L dimension alteration
LC
when D ≦ 10, ( α– 0.6) ≧ Q × 1.09 When D ≤ 12, ( α– 0.4) ≧ Q × 1.09 Designation method CTQ4
LC
CUQ
CCQ
L dimension tolerance alteration
■ Undercut Part Machining Items Codes
LKC
Spec.
LKC
Process undercut on the tip of sprue bushing as shown in the left drawing. Working limits S ≧α + 2 1.5 ≦ U ≦ 5 α + 2 ≦ T ≦ D or (V – 2UtanG°) Specification L max. ≧ L + U Unit of designation S, T, U = 0.1mm increments Designation method ZC – S3.5 – T4.0 – U2.0 E Designate ZC – S – T – U first when using BC/KC combination. Then designate BC/KC alterations etc.
R0.5 R0.5
■ Alteration of Nozzle Touch Part Items Codes
Spec.
Undercut machining
ZC
Change of depth of nozzle touch part
For the alteration of nozzle touch part (SR) depth E Note that when you use the FC code, the method of calculating the α dimension changes. E Available for flange thickness 8mm
FC
L
U ± 0.1
FC
■ Step R Processing Items Codes
T
The T dimension taper angle will be changed. 30° ( ± 30 ′ ) c 40° ( ± 30 ′ ) Designation method SXDM16 – 35.0 – P3.5 – A2 – TFC E Available only for extension type
T dimension taper angle change
Spec.
TFC
The step R is processed in the tip bore to prevent the connection between the sprue and the runner from breaking when releasing from the mold. E The step R is cut with an inner R cutter. Surface roughness and position precision are not provided. E Available for α≧ 5
Step R processing
RC
■ About the neck part of sprue bushings Flange necks of sprue bushings may have gone through a relief process (3mm range). Since the R is larger than the escape depth, the mounting hole should be chamfered. (Please refer to each page for details.)
Step R dimension choices
3
E Straight type D– α– (2 × RC) ＞ 2 E Tapered type V –α– (2 × RC) ＞ 2 X Combination with shapes A, B and C not available. X Combination with ZC not available
Step R
R
1 2
673
674
L
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