SPT_劈刀设计说明

FABØ3/6 = 3H2(H-WD)/16 + (CD3-H3)/24tan(0.5CA) + MBD2(MBH)/4
FABØ3 = 18H2(H-WD)/16 + (CD3-H3)/4tan(0.5CA) + 3MBD2(MBH)/2
Basic Capillary Design
PTD Group
Stitch Length formed by T, CD and OR （鱼尾长度由T, CD and OR形成）
OR
T
Basic Capillary Design
SL
WD
PTD Group
‘OR’ - ‘FA’ Combination（结合）:
OR
FA
Smaller（小） FA Bigger （大） OR
MBD
Mashed Ball
Diameter
PTD Group
Free Air Ball空气球 = Mashed Ball变形 球（体积）
FABØ
VOLFAB
VOLFAB=FABØ3/6
VolFAB = VolMB
WD
H
1
2
3
MB
C
H
MD B
CD A Basic Capillary Design
Basic Capillary Design
OR
FA Bigger （大） FA Smaller （小） OR
PTD Group

Stitch Profile based on Outside Radius (OR)（第二焊点形状基于外切角半径）：
OR
WD
O R
Reduced weld (stitch) length for
BNA)
T < 2BPP-WD-(2LH-
WD)tan(TA/2)-24
T > CD+ 2OR
LH
OR
WD
T
Basic Capillary Design
BP P
PTD Group
Tip Diameter (T):
Tangential assumption...
T/2 = BPP - a - b
(WD+e)/2 TA/2
big OR （大OR减少鱼尾长度）
Basic Capillary Design
PTD Group
Maximum Computed ‘OR’
（
最大的计算OR）
TA/2
OR(max )
FA (T-CD)/2
OR(max) = [(TCD)/2]{cos(TA/2)/cos(TA/2+FA)}tan[(90+TA/2+FA)/2]
Basic Capillary Design
PTD Group
Capillary dimensions affects the stitch bond formation （影响第二焊点的劈刀尺寸参数） :
2nd Bond (Stitch)
Basic Capillary Design
OR FA
T PTD Group
PTD Group
Chamfer Diameter (CD)（内切角直径）:
CD < MBD（变形后的金 球直径）/1.2
< (BPO铝垫开窗 *10µm)/1.2
H孔径+10µm
*10µm clearance includes
machine/operator error,
MB capillary tolerance（ 10µm包含设
=
VOL1
+
VOL2
+
VOL3
=
VOL1=3H2(H-WD)/16
VOL2=+(CD3H3)/24ta+n(0.5CA)
VOL3= MBD2(MBH)/4
PTD Group
FAB=MB Volume Equation综合:
FABØ
WD H
VolFAB = VolMB
CD MBD CA
MBH
=
Free Air Ball
Basic Capillary Design
Mashed Ball
PTD Group
Free Air Ball空气球 = Mashed Ball变形球:
VolFAB
Vol体积FAB = Vol 体积MBD
VolMB
FABØ Free Air
Ball
Basic Capillary Design
PTD Group
Bonding Sequence （焊线顺序）
Cycle 6（第六步）:
Free Air Ball ‘FAB’ Formation（打火烧球
形成金球）
Basic Capillary Design
PTD Group
Looping Formation（弧度形成）:
Capillary Travel Path Forming a Typical
CD
D 备/操作者的误差，劈刀尺寸的公差
）
Basic Capillary Design
PTD Group
Chamfer Angle (CA)内切角角度:
Smaller（小） CA - Smaller MBD Bigger（大） CA - Bigger MBD
MBD CD
MBD
CD
CA(70°)
CA(120°)
Tail Formation （尾丝形成）
Basic Capillary Design
PTD Group
Bonding Sequence （焊线顺序）
Cycle 5（第五步）:
Detach tail from the stitch.（从第二焊点 处拉断尾丝）
Basic Capillary Design
Basic Capillary Design
PTD Group
Bonding Sequence （焊线顺序 ） Cycle 2 （第二步） :
Ball Bond Formation （球形形成）
Basic Capillary Design
PTD Group
Bonding Sequence（焊线顺序）
Critical（临界） Loop Height (CLH):
High Reverse Loop Normal Loop
Basic Capillary Design
BNA
CLH
PTD Group
Tip Diameter (T): Tan(TA/2)= BPP-WD/2-T/2-clearance LH-WD/2
70µm
OR
=75µm =64µm =51µm =38µm =30µm =20µm =12µm =10µm
PTD Group
‘CD’ – Termination（终止） of the Stitch (鱼尾）:
Basic Capillary Design
PTD Group
First Bond (Ball Formation):第一焊点形成
TA
(MTA or BNA)
T(max) = 2BPP-WD-(2LHWD)tan(TA/2)-24
LH WD
TA/2 LH-WD/2
T
Basic Capillary Design
BP P
BPP-WD/2-T/2clearance
PTD Group
Tip Diameter (T):
TA (MTA or
OR FA
T
1st Bond (Ball) （变形后的金球）
PTD Group
Hole Size (H)（孔径） H（孔径）= WD
（线径）+ 40%±10%
Recommended（推荐）: H = 1.4WD
For Fine Pitch（小间距）: H = 1.3WD (min)
H
WD
Basic Capillary Design
TA/2
WD +
clearance (e)
LH MBH
Basic Capillary Design
T/2
a
b
BP P
PTD Group
知识回顾 Knowledge Review
Basic Capillary Design
PTD Group
Basic Capillary Design
PTD Group
‘OR’ based on（ 基于）Tip Diameter (T):
T
Basic Capillary Design
OR WD
T
360µm
330300µm
250200µm
180165µm
FA
150130µm
120110µm
100-75µm
Loop Profile（劈刀行程 路线形成弧度形状）
Basic Capillary Design
PTD Group
Capillary dimensions affects the ball bond formation（影响第一焊点的劈刀尺寸参数）:
H CD CA
Basic Capillary Design
Cycle 3 （第三步） :
After looping formation, cycle performs stitch bond profile. （弧度形成后，焊接 第二焊点）
Basic Capillary Design
PTD Group
Bonding Sequence（焊线顺序）
Cycle 4（第四步）:
Basic Capillary Design Rules （劈刀基本设计规则）
Basic Capillary Design
PTD Group
Bonding Sequence （焊线顺序 ） Cycle 1（第一步）:
The Free Air Ball ‘FAB’ is centered inside the capillary chamfer . （金球被真空吸入劈 刀内切角处）
T/2 = BPP - [(WD+e)/2]cos(TA/2)
- {LH-MBH+(WD+e)/2+[(WD+e)/2]sin(TA/2)}tan(TA/2) T(max) = 2BPP - (WD+e)cos(TA/2)
- {2LH-2MBH-WDe+(WD+e)sin(TA/2)}tan(TA/2)
Basic Capillary Design
*With the same（相同）
CD, H, FAB & WD
PTD Group
Inner Chamfer ‘IC’ Function （内切角的作用）
FAB Centering（金球定中心） Resultant from US Transfer （与超声波传递的界面）