CN105598253A - Lead frame die and working method thereof - Google Patents
Lead frame die and working method thereof Download PDFInfo
- Publication number
- CN105598253A CN105598253A CN201511007116.9A CN201511007116A CN105598253A CN 105598253 A CN105598253 A CN 105598253A CN 201511007116 A CN201511007116 A CN 201511007116A CN 105598253 A CN105598253 A CN 105598253A
- Authority
- CN
- China
- Prior art keywords
- skewed slot
- waste material
- lead frame
- die
- die cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/14—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/06—Stripping-off devices
- B21D45/08—Stripping-off devices interrelated with motion of tool
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lead Frames For Integrated Circuits (AREA)
Abstract
The invention relates to a lead frame die. The lead frame die comprises a convex die (3) and a concave die (1) which are vertically arranged and is characterized in that two or more than two chutes (5) are formed in the inner wall of the upper half section of a mold cavity (2), and the top ends of the chutes (5) extend to the top surface of the concave die (1); the chutes (5) are arranged in the same oblique direction along the central axis of the mold cavity (2) and form a spiral groove in the inner wall of the mold cavity (2). Therefore, the lead frame die has the advantages that wastes cannot rise along with the convex die so as to be prevented from crumb jumping, and the higher cutting quality of a lead frame is ensured.
Description
Technical field
The present invention relates to a kind of lead frame mould and method of work thereof.
Background technology
After cold-punching mould stamping-out completes, should stay blank or punched scrap in the die cavity 2 of die 1, but jump out with punch the phenomenon of staying die surface or cutting edge place for various reasons and be called and jump bits. At precision stamping, particularly in circuit lead frame punching course, scraps-bounce, putty and PUNCH(stamping machine) generation of the phenomenon of bursting apart not only affects the surface quality of product, and greatly affects the production efficiency of product. How to suppress scraps-bounce, putty and the PUNCH phenomenon of bursting apart, reduce it is the problem that will solve in stamping-out process on the impact of product quality always.
Therefore be studied analysis for this problem, referring to Fig. 1, in stamping-out process, waste material is mainly subject to three power: the absorption affinity F of punch 3 to it; Frictional force fm with die wall; Self gravitation G. If F < G+fm, waste material just can be stayed in the die cavity 2 of die 1 smoothly, treats that follow-up ejecting force releases it from counterdie; Otherwise, there is to jump bits phenomenon.
Size and the blade clearance of frictional force fm are closely related, and the frictional force of the larger waste material in gap and die wall is just less, also relevant to the roughness of die wall in addition.
Absorption affinity F is a kind of making a concerted effort, and its component mainly comprises:
1, when stamping-out, waste material upper surface and punch lower surface are vacuum state, and atmospheric pressure effect causes producing absorption affinity f1 between the two;
2, as shown in Figure 1, the air 4 between the first waste material a and the second waste material b causes negative pressure f2 by compression;
3, the absorption affinity f3 that die-cut oil produces;
4, the magnetic force f4 that punch residual magnetism produces.
Secondly:
The punching oil of scraped surface when stamping-out, fits tightly punch lower surface and waste material, hinders ambient air and flows into, and waste material is lifted;
Complete at stamping-out, punch reset time, die becomes cylinder, punch becomes piston, between waste material and punch lower surface, produces negative pressure, waste material is sucted.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, provide a kind of waste material can not rise with punch, prevent that waste material jumping bits phenomenon from occurring, and ensures the higher lead frame mould of lead frame stamping-out quality.
The object of the present invention is achieved like this:
A kind of lead frame mould, it comprises punch and the die arranged up and down, the inwall that it is characterized in that the upper semisection of die cavity is provided with twice or skewed slots more than twice, the top of described skewed slot extends to the end face of die, twice or skewed slots more than twice prolong same oblique layout along the axis of die cavity, twice or skewed slots more than twice form helicla flute at die cavity inwall.
The radius of the cross section of skewed slot is 0.05mm.
When the cross section of described die cavity is rectangle, in the time that the long limit of waste material is less than 1mm, the skewed slot under mid point each setting in the long limit of die cavity inwall is oblique together, adds up to twice skewed slot; In the time that the long limit of waste material is greater than 1mm, on 1/4, the long limit of die cavity inwall and 3/4 each skewed slot arranging under oblique together, add up to four road skewed slots 5.
When the cross section of described die cavity is circular, in the time that the diameter of waste material is less than 0.5mm, locate the skewed slot of each setting under oblique together 2 of the axisymmetric inwalls in the center of die cavity, add up to twice skewed slot; In the time that the diameter of waste material is greater than 0.5mm, equidistantly cut apart at the inwall of die cavity 3 locates the skewed slot of each setting under oblique together, add up to three road skewed slots.
The depth requirements of described skewed slot:
In the time that the thickness of lead frame is greater than 0.4mm, the width of skewed slot is 0.03mm;
In the time that the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot is 0.02mm;
In the time that the thickness of lead frame is less than 0.125, the width of skewed slot is 0.01mm.
A kind of method of work of lead frame mould, it is characterized in that a kind of lead frame mould, punch carries out stamping-out to lead frame, the bottom of die is poured waste material in the die cavity of die, the outward flange of the waste material after stamping-out forms the projection mating with skewed slot, punch rises subsequently, punch is that straight line rises in the process rising, due to the effect of absorption affinity F, waste material has the trend rising along with punch, but due to the setting of skewed slot, make waste material to increase by straight line, therefore waste material separated with punch due to stopping of skewed slot, waste material remains in die cavity, along with proceeding of stamping-out, waste material finally drops down onto in the ash can of its below by the middle part hollow part of die shoe.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is in the time that punch carries out stamping-out to lead frame, the bottom of die is poured waste material in the die cavity of die, the outward flange of the waste material after stamping-out forms the projection mating with skewed slot, punch rises subsequently, and punch is that straight line rises in the process rising, due to the effect of absorption affinity F, waste material has the trend rising along with punch, but due to the setting of skewed slot, make waste material to increase by straight line, therefore waste material separated with punch due to stopping of skewed slot. Therefore this lead frame mould has waste material and can not rise with punch, prevents that waste material from jumping bits phenomenon and occurring, and ensures the higher advantage of lead frame stamping-out quality.
Brief description of the drawings
Fig. 1 is the stressed exemplary plot of waste material.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the schematic diagram of rectangle waste material.
Fig. 4 is the long limit of rectangle waste material waste material schematic diagram of the present invention while being less than 1mm.
Fig. 5 is the long limit of rectangle waste material waste material schematic diagram of the present invention while being greater than 1mm.
Fig. 6 is the schematic diagram of circular waste material.
Fig. 7 is circular waste material diameter waste material schematic diagram of the present invention while being less than 0.5mm.
Fig. 8 is circular waste material diameter waste material schematic diagram of the present invention while being greater than 0.5mm.
Wherein:
Die 1
Die cavity 2
Punch 3
Air 4
Skewed slot 5
Die shoe 6
Ash can 7
The first waste material a
The second waste material b.
Detailed description of the invention
Referring to Fig. 2, a kind of lead frame mould the present invention relates to, it comprises punch 3 and the die 1 arranged up and down, the cross section of the die cavity 2 of described die 1 is circle or rectangle, the inwall of the upper semisection of die cavity 2 (die and the actual cooperating of punch effective section) is provided with twice or skewed slot more than twice 5, and the top of described skewed slot 5 extends to the end face of die 1. Twice or skewed slot more than twice 5 prolong same oblique layout along the axis of die cavity 2, therefore twice or skewed slot more than twice 5 form helicla flute at die cavity 2 inwalls. The radius of the cross section of skewed slot 5 is 0.05mm.
The position of skewed slot 5 is described in detail in detail below:
Waste material for the traditional square-section shown in Fig. 3:
In the time that the long limit of waste material is less than 1mm, skewed slot 5 under mid point each setting in the long limit of die cavity 2 inwalls is oblique together, adds up to twice skewed slot 5, and the waste material shape that stamping-out goes out like this changes to as shown in Figure 4, at a projection of the two each formation in long limits of waste material, the size of projection is consistent with the cross section of skewed slot 5.
In the time that the long limit of waste material is greater than 1mm, on 1/4, the long limit of die cavity 2 inwalls and 3/4 each skewed slot 5 arranging under oblique together, add up to four road skewed slots 5, the waste material shape that stamping-out goes out like this changes to as shown in Figure 5,1/4 and two projections of 3/4 each formation growing limits at two of waste material, the size of projection is consistent with the cross section of skewed slot 5.
Waste material for the traditional circular cross-section shown in Fig. 6:
In the time that the diameter of waste material is less than 0.5mm, locate the skewed slot 5 of each setting under together oblique 2 of the axisymmetric inwalls in the center of die cavity 2, add up to twice skewed slot 5, the waste material shape that stamping-out goes out like this changes to as shown in Figure 7, cylindrical at waste material forms two projections, two projections are along waste material central point layout, and the size of projection is consistent with the cross section of skewed slot 5.
In the time that the diameter of waste material is greater than 0.5mm, equidistantly cut apart at the inwall of die cavity 23 locate the skewed slot 5 of each setting under oblique together, add up to three road skewed slots 5, the waste material shape that stamping-out goes out like this changes to as shown in Figure 8, cylindrical at waste material forms three projections, three projection equi-spaced apart are evenly arranged, and the size of projection is consistent with the cross section of skewed slot 5.
The depth requirements of skewed slot 5 is described in detail in detail below:
In the time that the thickness of lead frame is greater than 0.4mm, the width of skewed slot 5 is 0.03mm;
In the time that the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot 5 is 0.02mm;
In the time that the thickness of lead frame is less than 0.125, the width of skewed slot 5 is 0.01mm;
Operation principle:
In the time that punch 3 carries out stamping-out to lead frame, the bottom of die 2 is poured waste material in the die cavity 2 of die 1, the outward flange of the waste material after stamping-out forms the projection mating with skewed slot 5, punch 3 rises subsequently, punch 3 is that straight line rises in the process rising, due to the effect of absorption affinity F, waste material has the trend rising along with punch 3, but due to the setting of skewed slot 5, make waste material to increase by straight line, therefore waste material separated with punch 3 due to stopping of skewed slot 5, waste material remains in proceeding along with stamping-out in die cavity 2, waste material finally drops down onto in the ash can 7 of its below by the middle part hollow part of die shoe 6.
Claims (6)
1. a lead frame mould, it comprises punch (3) and the die (1) arranged up and down, the inwall that it is characterized in that the upper semisection of die cavity (2) is provided with twice or skewed slot more than twice (5), the top of described skewed slot (5) extends to the end face of die (1), twice or skewed slot more than twice (5) prolong same oblique layout along the axis of die cavity (2), and twice or skewed slot more than twice (5) form helicla flute at die cavity (2) inwall.
2. a kind of lead frame mould according to claim 1, the radius that it is characterized in that the cross section of skewed slot is 0.05mm.
3. a kind of lead frame mould according to claim 1, when the cross section that it is characterized in that described die cavity is rectangle, in the time that the long limit of waste material is less than 1mm, at the each skewed slot arranging under oblique together of the long limit of die cavity inwall mid point, adds up to twice skewed slot; In the time that the long limit of waste material is greater than 1mm, on 1/4, the long limit of die cavity inwall and 3/4 each skewed slot arranging under oblique together, add up to four road skewed slots 5.
4. a kind of lead frame mould according to claim 1, when the cross section that it is characterized in that described die cavity is circular, in the time that the diameter of waste material is less than 0.5mm, locate the skewed slot of each setting under together oblique 2 of the axisymmetric inwalls in the center of die cavity, add up to twice skewed slot; In the time that the diameter of waste material is greater than 0.5mm, equidistantly cut apart at the inwall of die cavity 3 locates the skewed slot of each setting under oblique together, add up to three road skewed slots.
5. a kind of lead frame mould according to claim 1, is characterized in that the depth requirements of described skewed slot:
In the time that the thickness of lead frame is greater than 0.4mm, the width of skewed slot is 0.03mm;
In the time that the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot is 0.02mm;
In the time that the thickness of lead frame is less than 0.125, the width of skewed slot is 0.01mm.
6. the method for work of a lead frame mould, it is characterized in that adopting a kind of lead frame mould as claimed in claim 1, punch carries out stamping-out to lead frame, the bottom of die is poured waste material in the die cavity of die, the outward flange of the waste material after stamping-out forms the projection mating with skewed slot, punch rises subsequently, punch is that straight line rises in the process rising, due to the effect of absorption affinity F, waste material has the trend rising along with punch, but due to the setting of skewed slot, make waste material to increase by straight line, therefore waste material separated with punch due to stopping of skewed slot, waste material remains in die cavity, along with proceeding of stamping-out, waste material finally drops down onto in the ash can of its below by the middle part hollow part of die shoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511007116.9A CN105598253A (en) | 2015-12-30 | 2015-12-30 | Lead frame die and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511007116.9A CN105598253A (en) | 2015-12-30 | 2015-12-30 | Lead frame die and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105598253A true CN105598253A (en) | 2016-05-25 |
Family
ID=55978896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511007116.9A Pending CN105598253A (en) | 2015-12-30 | 2015-12-30 | Lead frame die and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105598253A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624225A (en) * | 2016-11-23 | 2017-05-10 | 江阴康强电子有限公司 | Blanking female die cavity clamping groove machining method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0957363A (en) * | 1995-08-25 | 1997-03-04 | Mitsui High Tec Inc | Precise press die |
| CN201020500Y (en) * | 2007-01-31 | 2008-02-13 | 蒋传刚 | Female mould capable of preventing waste material returning |
| CN201026513Y (en) * | 2007-04-24 | 2008-02-27 | 中国北车集团永济电机厂 | Novel blanking mold |
| CN103170532A (en) * | 2013-04-09 | 2013-06-26 | 铜陵三佳山田科技有限公司 | Scrap bounce prevention mold applied to punching of light-emitting diode (LED) bracket |
| CN205270530U (en) * | 2015-12-30 | 2016-06-01 | 江阴康强电子有限公司 | Lead frame mould |
-
2015
- 2015-12-30 CN CN201511007116.9A patent/CN105598253A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0957363A (en) * | 1995-08-25 | 1997-03-04 | Mitsui High Tec Inc | Precise press die |
| CN201020500Y (en) * | 2007-01-31 | 2008-02-13 | 蒋传刚 | Female mould capable of preventing waste material returning |
| CN201026513Y (en) * | 2007-04-24 | 2008-02-27 | 中国北车集团永济电机厂 | Novel blanking mold |
| CN103170532A (en) * | 2013-04-09 | 2013-06-26 | 铜陵三佳山田科技有限公司 | Scrap bounce prevention mold applied to punching of light-emitting diode (LED) bracket |
| CN205270530U (en) * | 2015-12-30 | 2016-06-01 | 江阴康强电子有限公司 | Lead frame mould |
Non-Patent Citations (1)
| Title |
|---|
| 宋拥政: "《电机电器电子高速精密冲压件制造技术》", 31 October 2013 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624225A (en) * | 2016-11-23 | 2017-05-10 | 江阴康强电子有限公司 | Blanking female die cavity clamping groove machining method |
| CN106624225B (en) * | 2016-11-23 | 2018-06-08 | 江阴康强电子有限公司 | A kind of punching and blanking die cavity card slot processing method |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160525 |