KR20170088182A - An Apparatus for Grinding a Surface of a Lead Frame - Google Patents
An Apparatus for Grinding a Surface of a Lead Frame Download PDFInfo
- Publication number
- KR20170088182A KR20170088182A KR1020160008205A KR20160008205A KR20170088182A KR 20170088182 A KR20170088182 A KR 20170088182A KR 1020160008205 A KR1020160008205 A KR 1020160008205A KR 20160008205 A KR20160008205 A KR 20160008205A KR 20170088182 A KR20170088182 A KR 20170088182A
- Authority
- KR
- South Korea
- Prior art keywords
- unit
- lead frame
- tension
- module
- abrasive belt
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/006—Machines or devices using grinding or polishing belts; Accessories therefor for special purposes, e.g. for television tubes, car bumpers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/18—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/18—Accessories
- B24B21/20—Accessories for controlling or adjusting the tracking or the tension of the grinding belt
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame surface polishing apparatus, and more particularly, to a lead frame surface polishing apparatus that polishes an epoxy molding compound (EMC) coated on a lead frame of a semiconductor to form a uniform coated surface . The lead frame surface polishing apparatus comprises a transfer unit (12) for transferring a lead frame having a coated surface to be polished; A balance spindle module (11) disposed below the transfer unit (12) and arranged to be able to contact the surface of the lead frame; A contact spindle unit 14 disposed above the transfer unit 12; A Z axis module 17 for up and down movement of the contact spindle unit 14; And an abrasive belt rotated by the contact spindle unit 14. [
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame surface polishing apparatus, and more particularly, to a lead frame surface polishing apparatus that polishes an epoxy molding compound (EMC) coated on a lead frame of a semiconductor to form a uniform coated surface .
The lead frame functions as a conductor for connecting the semiconductor chip to an external circuit, and simultaneously functions as a frame for fixing the semiconductor package to the electronic circuit board. An epoxy molding compound (EMC) may be coated to protect the semiconductor chip disposed in the lead frame or the lead frame from the external environment. During the coating process, the lead frame may be partially overcoated. Such an overcoated portion may reduce the surface uniformity level of the lead frame surface and may cause defects in the semiconductor package, so that the overcoated portion needs to be polished.
Prior art related to a semiconductor lead frame is disclosed in Patent Publication No. 10-1999-0002969. The prior art includes a first step of exposing a coin to be electrolytically polished using a mask; A second step of applying a predetermined potential between the coining portion and the machining electrode; A third step of spraying an electrolytic polishing solution on the exposed coin part to perform electrolytic polishing; And a fourth step of separating the mask from the lead frame after electrolytic polishing is performed on the coinning portion.
Japanese Patent Application Laid-Open No. 10-2006-0112307 discloses a patterning process for integrally forming a plurality of leads on a prepared base material and a tip connecting portion interconnecting the ends of the leads. And a step of pressing the lead frame by using a mold having a predetermined shape, wherein a cutting process for cutting the leading end connecting portion and a setting process for forming a step up and down with respect to a lead frame portion are performed simultaneously A method of manufacturing a lead frame including a lead frame punching molding process to be performed is disclosed.
The technique related to the lead frame disclosed in the prior art does not disclose a method of making the surface of the lead frame uniform, or has a problem that a complicated process condition is required. The thickness of the lead frame may be, for example, 100 to 300 占 퐉, and the EMC coating thickness may be 60 to 70 占 퐉. There is a need for a grinding method which has high reliability and which is not complicated in the process and can be controlled precisely at the same time in order to uniformly form the coating thickness of the lead frame having such a thickness level. The prior art does not disclose a technique or method suitable for such conditions.
The present invention has been made to solve the problems of the prior art and has the following purpose.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a lead frame surface grinding apparatus capable of forming a uniformly coated surface of a lead frame by automatically setting the grinding conditions of the grinding belt.
According to a preferred embodiment of the present invention, the lead frame surface grinding apparatus comprises a transfer unit for transferring a lead frame having a coated surface to be polished; A balance spindle module disposed below the transfer unit and arranged to be able to contact the surface of the lead frame; A contact spindle unit disposed above the transfer unit; A Z-axis module for up-and-down movement of the contact spindle unit; And an abrasive belt rotated by the contact spindle unit.
According to another preferred embodiment of the present invention, a tension unit for adjusting the tension of the abrasive belt and a drive roller unit for rotating the contact spindle unit are further included.
According to another preferred embodiment of the present invention, the polishing apparatus further comprises a detection unit for measuring the warp and tension of the abrasive belt.
According to another preferred embodiment of the present invention, the polishing belt is vertically moved by a moving block coupled to the shaft block, and the moving block moves up and down along a linear guide disposed at four corners of the hexahedron- do.
The lead frame surface grinding apparatus according to the present invention permits the overcoating of the coated surface of the lead frame to be eliminated while enhancing the reliability by mechanical polishing and machining. Further, the lead frame surface grinding apparatus according to the present invention has a built-in type spindle, which improves the operating precision. The lead frame surface grinding apparatus according to the present invention is capable of constant speed and variable speed while allowing tension or skew to be automatically adjusted. In addition, the leadframe surface device according to the present invention has the advantage of being able to apply one or more belts.
Figs. 1A, 1B and 1C show a front view, a plan view and a side view, respectively, of an embodiment of a surface grinding apparatus according to the present invention.
Fig. 2 shows an embodiment of the structure of the transfer unit applied to the surface grinding apparatus according to the present invention.
FIG. 3 shows an embodiment of a vertical module applied to a surface grinding apparatus according to the present invention.
4 shows an embodiment of a polishing module applied to a surface polishing apparatus according to the present invention.
5A and 5B illustrate an example of a position adjustment process of the polishing module in the surface polishing apparatus according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.
Figs. 1A, 1B and 1C show a front view, a plan view and a side view, respectively, of an embodiment of a surface grinding apparatus according to the present invention.
Referring to Figs. 1A, 1B and 1C, the
The
The
The lead frame for the semiconductor package can be conveyed along the conveying line SL through a conveyor operated by the
The
A polishing module for the operation of the polishing belt GV can be arranged above the
The surface on which the abrasive belt GV is brought into contact with the coating surface of the lead frame can be coated with an abrasive material. The abrasive material may be, for example, diamond and the abrasive material may be coated on the surface of the abrasive belt (GV) in a uniform thickness. As described above, the coefficient of friction of the abrasive material may be smaller than the coefficient of friction of the material of the
Frictional heat can be generated in the process of grinding the lead frame by the grinding belt GV and the cooling water supply units WS1 and WS2 can be disposed in front of and behind the
The polishing
Fig. 2 shows an embodiment of the structure of the
2, the
The drive unit M such as a motor can be connected to one roller row R1 or two roller rows R2 via a power transmission means V such as a belt and can be connected to the drive unit M and the roller rows R1, ) Can be made in various ways. The
The
FIG. 3 shows an embodiment of a vertical module applied to a surface grinding apparatus according to the present invention.
As described above, the polishing module can be moved up and down by the operation of the Z-axis module, and the Z-axis module includes a
The driving unit M1 can be a servo motor which can easily adjust the rotation angle, and can control the rotation of the
The polishing module can be moved up and down by the vertical module or the Z axis module, and the polishing module can be coupled to the Z axis module by the engagement bracket CB.
4 shows an embodiment of a polishing module applied to a surface polishing apparatus according to the present invention.
4, the
The
According to the present invention, a skew detection unit such as a laser unit is disposed for adjusting the skew of the
5A and 5B illustrate an example of a position adjustment process of the polishing module in the surface polishing apparatus according to the present invention.
5A and 5B, the lead frame CF can be conveyed by the conveying unit disposed above the main frame F, and the
The polishing module can be fixed to the moving
Referring to FIG. 5B, the moving
The tension of the
The skew or tension of the
The lead frame surface grinding apparatus according to the present invention permits the overcoating of the coated surface of the lead frame to be eliminated while enhancing the reliability by mechanical polishing and machining. Further, the lead frame surface grinding apparatus according to the present invention has a built-in type spindle, which improves the operating precision. The lead frame surface grinding apparatus according to the present invention is capable of constant speed and variable speed while allowing tension or skew to be automatically adjusted. In addition, the leadframe surface device according to the present invention has the advantage of being able to apply one or more belts.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.
10: Surface grinding device 11: Balance spindle module
12: transfer unit 13: inflow unit
14: contact spindle unit 15: tension unit
16: driving roller unit 17: Z-axis module
18: cooler 22: storage tank
23: exhaust tube 31: fixed frame
32: ball screw 33: moving block
35: Cable chain 36: Detection unit
41: abrasive belt 42: tension adjusting drive unit
43: tension adjusting frame 45: driving actuator
55: Adjustment bracket 211: Roller bracket
212: nozzle unit 214: supply fan
331, 332: linear guide 431: moving groove
CB: Coupling bracket CF: Lead frame
F: main frame GV: abrasive belt
M: drive unit M1: drive unit
R1: 1 roller column R2: 2 roller column
SL: Transfer line UP: Casing
V: Power transmission means VA: Axial block
WD: Exhaust unit WO: Worker
WS1, WS2: Cooling water supply unit
Claims (4)
A balance spindle module (11) disposed below the transfer unit (12) and arranged to be able to contact the surface of the lead frame;
A contact spindle unit 14 disposed above the transfer unit 12;
A Z axis module 17 for up and down movement of the contact spindle unit 14; And
And an abrasive belt rotated by the contact spindle unit (14).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160008205A KR20170088182A (en) | 2016-01-22 | 2016-01-22 | An Apparatus for Grinding a Surface of a Lead Frame |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160008205A KR20170088182A (en) | 2016-01-22 | 2016-01-22 | An Apparatus for Grinding a Surface of a Lead Frame |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020180009137A Division KR101892894B1 (en) | 2018-01-25 | 2018-01-25 | An Apparatus for Grinding a Surface of a Lead Frame |
Publications (1)
Publication Number | Publication Date |
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KR20170088182A true KR20170088182A (en) | 2017-08-01 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020160008205A KR20170088182A (en) | 2016-01-22 | 2016-01-22 | An Apparatus for Grinding a Surface of a Lead Frame |
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KR (1) | KR20170088182A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019093642A1 (en) * | 2017-11-09 | 2019-05-16 | 에스에스아이(주) | Material rotation-type silicone filament automatic grinding machine and grinding system using same |
CN115256151A (en) * | 2022-08-11 | 2022-11-01 | 湖州中芯半导体科技有限公司 | High-precision CVD diamond fine grinding tool |
-
2016
- 2016-01-22 KR KR1020160008205A patent/KR20170088182A/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019093642A1 (en) * | 2017-11-09 | 2019-05-16 | 에스에스아이(주) | Material rotation-type silicone filament automatic grinding machine and grinding system using same |
CN115256151A (en) * | 2022-08-11 | 2022-11-01 | 湖州中芯半导体科技有限公司 | High-precision CVD diamond fine grinding tool |
CN115256151B (en) * | 2022-08-11 | 2024-03-01 | 湖州中芯半导体科技有限公司 | High-precision CVD diamond micro grinding tool |
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