CN205270530U - Lead frame mould - Google Patents
Lead frame mould Download PDFInfo
- Publication number
- CN205270530U CN205270530U CN201521114739.1U CN201521114739U CN205270530U CN 205270530 U CN205270530 U CN 205270530U CN 201521114739 U CN201521114739 U CN 201521114739U CN 205270530 U CN205270530 U CN 205270530U
- Authority
- CN
- China
- Prior art keywords
- skewed slot
- twice
- waste material
- lead frame
- 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.)
- Expired - Fee Related
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- Lead Frames For Integrated Circuits (AREA)
Abstract
The utility model relates to a lead frame mould, it is including terrace die (3) and die (1) arranged from top to bottom, first section the inner wall of its characterized in that die cavity (2) is provided with chute (5) more than twice or the twice, the top of chute (5) extends to the top surface of die (1), and chute (5) more than twice or the twice are prolonged same slant along the axis of die cavity (2) and are arranged that chute (5) more than twice or the twice form the helicla flute at die cavity (2) inner wall. Consequently this lead frame mould has the waste material and can not rise along with the terrace die, prevents that the waste material from jumping the bits phenomenon and taking place, guarantees the higher advantage of lead frame blanking quality.
Description
Technical field
This utility model relates to a kind of lead frame mould.
Background technology
After cold-punching mould stamping-out completes, the blank in the die cavity 2 of die 1 or punched scrap should be stayed, but jump out the phenomenon staying molding surface or cutting edge place for various reasons with punch and be called jumping bits. At precision stamping, particularly in circuit lead frame punching course, scraps-bounce, putty and PUNCH(stamping machine) generation of phenomenon of bursting apart not only affects the surface quality of product, and largely effects on the production efficiency of product. How to suppress scraps-bounce, putty and PUNCH to burst apart phenomenon, reduce the problem that its impact on product quality is always up in blanking process solving.
Having researched and analysed hence for this problem, referring to Fig. 1, in blanking process, waste material is limited primarily by three power: the punch 3 absorption affinity F to it; Frictional force fm with die wall; Self gravitation G. If F < G+fm, then waste material just can be stayed in the die cavity 2 of die 1 smoothly, treats that it is released by follow-up ejecting force from counterdie; Otherwise, then occur to jump bits phenomenon.
The size of frictional force fm is closely related with blade clearance, and the more big waste material in gap is more little with the frictional force of die wall, additionally also relevant to the roughness of die wall.
Absorption affinity F is a kind of making a concerted effort, and its component specifically includes that
1, during stamping-out, waste material upper surface and punch lower surface are vacuum state, and atmospheric pressure effect causes generation absorption affinity f1 between the two;
2 as it is 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 during stamping-out, makes punch lower surface and waste material fit tightly, and hinders ambient air to flow into, and waste material is lifted;
Complete at stamping-out, punch reset time, die becomes cylinder, and punch becomes piston, between waste material and punch lower surface produce negative pressure, waste material is sucked up.
Summary of the invention
The purpose of this utility model is in that to overcome above-mentioned deficiency, it is provided that a kind of waste material will not rise with punch, it is prevented that waste material is jumped bits phenomenon and occurred, it is ensured that the lead frame mould that lead frame stamping-out quality is higher.
The purpose of this utility model is achieved in that
A kind of lead frame mould, it includes punch and the die arranged up and down, it is characterized in that the inwall of the upper semisection of die cavity is provided with the skewed slot of more than twice or twice, the top of described skewed slot extends to the end face of die, skewed slots more than twice or twice prolongs same diagonally disposed along the axis of die cavity, and 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, when the long limit of waste material is less than 1mm, skewed slot together obliquely is respectively set at the midpoint, long limit of die cavity inwall, adds up to twice skewed slot; When the long limit of waste material is more than 1mm, in each setting in 1/4 and 3/4, the long limit of die cavity inwall together skewed slot obliquely, add up to four road skewed slots 5.
When the cross section of described die cavity is circular, when the diameter of waste material is less than 0.5mm, the inwall 2 substantially symmetrical about its central axis at die cavity locates each setting skewed slot obliquely together, adds up to twice skewed slot; When the diameter of waste material is more than 0.5mm, the inwall at die cavity equidistantly split 3 locates each settings skewed slot obliquely together, adds up to three road skewed slots.
The depth requirements of described skewed slot:
When the thickness of lead frame is more than 0.4mm, the width of skewed slot is 0.03mm;
When the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot is 0.02mm;
When the thickness of lead frame is less than 0.125, the width of skewed slot is 0.01mm.
Compared with prior art, the beneficial effects of the utility model are:
This utility model is when lead frame is carried out stamping-out by punch, waste material is poured in the die cavity of die by the bottom of die, the outward flange of the waste material after stamping-out forms the projection mated with skewed slot, punch rises subsequently, and punch is ramp in the process risen, due to the effect of absorption affinity F, waste material has the trend along with punch rises, but the setting due to skewed slot so that waste material cannot ramp, and therefore waste material separates with punch due to the stop of skewed slot. Therefore this lead frame mould has waste material and will not rise with punch, it is prevented that waste material is jumped bits phenomenon and occurred, it is ensured that the advantage that lead frame stamping-out quality is higher.
Accompanying drawing explanation
Fig. 1 is the stress exemplary plot of waste material.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is the schematic diagram of rectangle waste material.
Fig. 4 be the long limit of rectangle waste material less than 1mm time waste material schematic diagram of the present utility model.
Fig. 5 be the long limit of rectangle waste material more than 1mm time waste material schematic diagram of the present utility model.
Fig. 6 is the schematic diagram of circular waste material.
Fig. 7 be circular waste material diameter less than 0.5mm time waste material schematic diagram of the present utility model.
Fig. 8 be circular waste material diameter more than 0.5mm time waste material schematic diagram of the present utility model.
Wherein:
Die 1
Die cavity 2
Punch 3
Air 4
Skewed slot 5
Die shoe 6
Ash can 7
First waste material a
Second waste material b.
Detailed description of the invention
Referring to Fig. 2, a kind of lead frame mould that this utility model relates to, it includes punch 3 and the die 1 arranged up and down, the cross section of the die cavity 2 of described die 1 is circular or rectangle, the inwall of the upper semisection (effective section of die and the actual cooperating of punch) of die cavity 2 is provided with the skewed slot 5 of more than twice or twice, and the top of described skewed slot 5 extends to the end face of die 1. Skewed slots 5 more than twice or twice prolongs same diagonally disposed along the axis of die cavity 2, and therefore skewed slots 5 more than twice or twice forms helicla flute at die cavity 2 inwall. The radius of the cross section of skewed slot 5 is 0.05mm.
The position of skewed slot 5 is explained in detail below:
Waste material for the traditional square-section shown in Fig. 3:
When the long limit of waste material is less than 1mm, respectively arranging skewed slot 5 together obliquely at the midpoint, long limit of die cavity 2 inwall, add up to twice skewed slot 5, the waste material shape being so punched out is changed to as shown in Figure 4, respectively forming a projection on two long limits of waste material, the size of projection is consistent with the cross section of skewed slot 5.
When the long limit of waste material is more than 1mm, in each setting in 1/4 and 3/4, the long limit of die cavity 2 inwall together skewed slot 5 obliquely, add up to four road skewed slots 5, the waste material shape being so punched out is changed to as shown in Figure 5, at two projections of 1/4 and 3/4 each formation on two long limits 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:
When the diameter of waste material is less than 0.5mm, inwall 2 substantially symmetrical about its central axis at die cavity 2 locates each setting skewed slot 5 obliquely together, add up to twice skewed slot 5, the waste material shape being so punched out is changed to as shown in Figure 7, cylindrical at waste material forms two projections, two projections are arranged along waste material central point, and the size of projection is consistent with the cross section of skewed slot 5.
When the diameter of waste material is more than 0.5mm, inwall at die cavity 2 equidistantly split 3 locates each settings skewed slot 5 obliquely together, add up to three road skewed slots 5, the waste material shape being so punched out is changed 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 explained in detail below:
When the thickness of lead frame is more than 0.4mm, the width of skewed slot 5 is 0.03mm;
When the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot 5 is 0.02mm;
When the thickness of lead frame is less than 0.125, the width of skewed slot 5 is 0.01mm;
Operation principle:
When lead frame is carried out stamping-out by punch 3, waste material is poured in the die cavity 2 of die 1 by the bottom of die 2, the outward flange of the waste material after stamping-out forms the projection mated with skewed slot 5, punch 3 rises subsequently, punch 3 is ramp in the process risen, effect due to absorption affinity F, waste material has the trend along with punch 3 rises, but the setting due to skewed slot 5, waste material cannot be ramped, therefore waste material separates with punch 3 due to the stop of skewed slot 5, waste material remains in proceeding along with stamping-out in die cavity 2, waste material drops down onto in ash can 7 below eventually through the middle part hollow part of die shoe 6.
Claims (5)
1. a lead frame mould, it includes punch (3) and the die (1) arranged up and down, it is characterized in that the inwall of the upper semisection of die cavity (2) is provided with the skewed slot (5) of more than twice or twice, the top of described skewed slot (5) extends to the end face of die (1), skewed slots (5) more than twice or twice prolongs same diagonally disposed along the axis of die cavity (2), and twice or skewed slots (5) more than twice form helicla flute at die cavity (2) inwall.
2. a kind of lead frame mould according to claim 1, it is characterised in that the radius of the cross section of skewed slot is 0.05mm.
3. a kind of lead frame mould according to claim 1, it is characterised in that when the cross section of described die cavity is rectangle, when the long limit of waste material is less than 1mm, skewed slot together obliquely is respectively set at the midpoint, long limit of die cavity inwall, adds up to twice skewed slot; When the long limit of waste material is more than 1mm, in each setting in 1/4 and 3/4, the long limit of die cavity inwall together skewed slot obliquely, add up to four road skewed slots 5.
4. a kind of lead frame mould according to claim 1, it is characterized in that the cross section of described die cavity is for time circular, when the diameter of waste material is less than 0.5mm, the inwall 2 substantially symmetrical about its central axis at die cavity locates each setting skewed slot obliquely together, adds up to twice skewed slot; When the diameter of waste material is more than 0.5mm, the inwall at die cavity equidistantly split 3 locates each settings skewed slot obliquely together, adds up to three road skewed slots.
5. a kind of lead frame mould according to claim 1, it is characterised in that the depth requirements of described skewed slot:
When the thickness of lead frame is more than 0.4mm, the width of skewed slot is 0.03mm;
When the thickness of lead frame is 0.152 ~ 0.4mm, the width of skewed slot is 0.02mm;
When the thickness of lead frame is less than 0.125, the width of skewed slot is 0.01mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521114739.1U CN205270530U (en) | 2015-12-30 | 2015-12-30 | Lead frame mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521114739.1U CN205270530U (en) | 2015-12-30 | 2015-12-30 | Lead frame mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205270530U true CN205270530U (en) | 2016-06-01 |
Family
ID=56055151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521114739.1U Expired - Fee Related CN205270530U (en) | 2015-12-30 | 2015-12-30 | Lead frame mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205270530U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598253A (en) * | 2015-12-30 | 2016-05-25 | 江阴康强电子有限公司 | Lead frame die and working method thereof |
-
2015
- 2015-12-30 CN CN201521114739.1U patent/CN205270530U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598253A (en) * | 2015-12-30 | 2016-05-25 | 江阴康强电子有限公司 | Lead frame die and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20191230 |