CN117463773A - Method for producing lead frame etching material - Google Patents
Method for producing lead frame etching material Download PDFInfo
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- CN117463773A CN117463773A CN202311432280.9A CN202311432280A CN117463773A CN 117463773 A CN117463773 A CN 117463773A CN 202311432280 A CN202311432280 A CN 202311432280A CN 117463773 A CN117463773 A CN 117463773A
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- blank
- finish rolling
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- lead frame
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 238000005530 etching Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 163
- 238000000137 annealing Methods 0.000 claims abstract description 81
- 238000012545 processing Methods 0.000 claims abstract description 30
- 238000003801 milling Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 13
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011009 performance qualification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a method for producing lead frame etching materials, which comprises the following steps: preparing a finish rolling blank; carrying out primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50% -80%; carrying out secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 10% -30%; straightening the blank after the second finish rolling to obtain the lead frame etching material. According to the production method of the lead frame etching material, the blank is subjected to multiple finish rolling, blank annealing and finish rolling annealing, and the finish rolling processing rate of each blank is reasonably controlled, so that the lead frame etching material with stable hardness, tensile strength and material flatness is prepared.
Description
Technical Field
The application relates to a metal material production process technology, in particular to a lead frame etching material production method.
Background
The etching material of the lead frame is a copper alloy strip for large-scale integrated circuits, and the production process can be divided into an annealing method and a small-processing-rate preparation method.
However, when the lead frame etching material is produced by the annealing method, the performance of the strip material is very changed after annealing, so that the qualified performance is difficult to ensure; the method for preparing the strip material with small processing rate improves the control of the material plate shape, but the performance of the prepared lead frame etching material is not very stable.
Disclosure of Invention
Based on the above expression, the invention provides a production method of a lead frame etching material, which aims to solve the technical problems of poor performance qualification of the lead frame etching material prepared by an annealing method and unstable performance of the lead frame etching material prepared by a small processing rate preparation method in the prior art.
The technical scheme for solving the technical problems is as follows:
s1, preparing a finish rolling blank for finish rolling;
s2, performing primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50% -80%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 10% -30%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
According to the production method of the lead frame etching material, the material stress and the material flatness of the blank are improved through multiple finish rolling, the processing rate of the first finish rolling is adjusted to be larger than that of the second finish rolling, annealing treatment is carried out after the first finish rolling, the size of material crystal grains is controlled, the material with good corrosion stress and flat plate surface is obtained, and the lead frame etching material with excellent final hardness and tensile strength is obtained through the second finish rolling treatment and straightening treatment.
On the basis of the technical scheme, the invention can be improved as follows.
The step S1 is a step of preparing a finish rolling blank, and specifically comprises the following steps of:
s11, cogging and annealing after milling the surface of the hot rolled blank to obtain a cogged blank;
and step S12, performing finish rough rolling on the blank to obtain a finish rolling blank.
And in the step S11, the hot rolled blank is subjected to cogging annealing after milling, and the thickness of the cogged blank is 1.0-3.0 mm in the step of preparing the cogged blank. In one embodiment, in the step of performing cogging annealing after milling the surface of the hot rolled blank to obtain the cogged blank, the thickness of the cogged blank is 1.0mm-2.0mm. In one embodiment, in the step of performing cogging annealing after milling the surface of the hot rolled blank to obtain the cogged blank, the thickness of the cogged blank is 2.0mm-3.0mm. In one embodiment, in the step of forming the billets by cogging and annealing after milling the surface of the hot rolled billets, the thickness of the billets is 2.0mm. More specifically, the blanks are sent to an air cushion furnace for annealing in this step.
And step S12, cogging and annealing after milling the surface of the hot rolled blank, wherein in the step of preparing the cogged blank, the annealing temperature is 400-700 ℃. More specifically, the blank is sent to a bell furnace for annealing in this step. In one embodiment, in the step S12, the annealing temperature is 500-600 ℃ in the step of cogging and annealing after milling the surface of the hot rolled blank. In one embodiment, in the step S12, the annealing temperature is 550 ℃ to 700 ℃ in the step of cogging and annealing the hot rolled blank after milling the surface. In one embodiment, in the step S12, the annealing temperature is 400 ℃ to 550 ℃ in the step of cogging and annealing the hot rolled blank after milling the surface. In one embodiment, in the step S12, the annealing temperature is 550 ℃ in the step of cogging and annealing the hot rolled blank after milling the surface. More specifically, the blank is sent to a bell furnace for annealing in this step.
Further, in the step of preparing the finish rolling blank by annealing after finish rough rolling of the blank, the annealing temperature is 300-600 ℃. In one embodiment, the annealing temperature is 400-500 ℃ in the step of preparing the finish rolling blank after the finish rolling blank is finished and rough rolled; in one embodiment, the annealing temperature is 450-500 ℃ in the step of preparing the finish rolling blank after the finish rolling blank is finished and rough rolled; in one embodiment, the annealing temperature is 400 ℃ to 450 ℃ in the step of preparing the finish rolling blank after the finish rolling blank is finished and rough rolled.
The grain size of the blank is controlled by annealing the cogged blank and annealing the finish-rolled blank for a plurality of times, so that the material with good corrosion stress and flat plate surface is obtained.
Further, in the step S2, the finish rolling blank is subjected to the first finish rolling and annealing treatment, and the annealing temperature is 500-700 ℃. In one embodiment, the finish rolling stock is subjected to a first finish rolling and annealing step at a temperature of 500 ℃ to 600 ℃. In one embodiment, the finish rolling stock is subjected to a first finish rolling and annealing step at a temperature of 600 ℃ to 700 ℃. In one embodiment, the finish rolling stock is subjected to a first finish rolling and annealing step at an annealing temperature of 600 ℃.
Further, in the step S2, the finish-rolled blank is subjected to the first finish-rolling and annealing treatment steps, and the thickness of the blank after the first finish-rolling is 0.5mm-1.0mm. In one embodiment, the finish rolled blank is subjected to the first finish rolling and annealing treatment step to obtain a blank having a thickness of 0.5mm to 0.7mm after the first finish rolling. In one embodiment, the finish rolled blank is subjected to the first finish rolling and annealing treatment step to obtain a blank having a thickness of 0.7mm to 1.0mm after the first finish rolling. In one embodiment, the finish rolled blank is subjected to the first finish rolling and annealing step to produce a blank having a thickness of 0.7mm after the first finish rolling.
Further, the step S2 is to carry out primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50% -80%; in one embodiment, performing primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50% -64%; in one embodiment, performing primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 64% -80%; in one embodiment, the first finish rolling has a processing rate of 64%.
Further, in the step S2, the finish-rolled blank is subjected to the second finish-rolling and annealing treatment step, and the thickness of the blank after the second finish-rolling is 0.15mm-0.35mm. In one embodiment, the finish rolled blank is subjected to the second finish rolling and annealing treatment step to obtain a second finish rolled blank having a thickness of 0.15mm to 0.25mm. In one embodiment, the finish rolled blank is subjected to the second finish rolling and annealing step to obtain a second finish rolled blank having a thickness of 0.25mm to 0.35mm.
In one embodiment, the step S3 is to perform a second finish rolling treatment on the blank after the first finish rolling to obtain a blank after the second finish rolling, where the processing rate of the second finish rolling is 10% -30%; carrying out secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 10% -18.8%; carrying out secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 18.8% -30%; in one embodiment, the blank after the first finish rolling is subjected to a second finish rolling treatment to obtain a blank after the second finish rolling, wherein the processing rate of the second finish rolling is 18.8%.
In one embodiment, the step S4 is to straighten the blank after the second finish rolling, so as to obtain the etched material of the lead frame with a vickers hardness of 10Hv, a tensile strength of 10MPa and a plate shape controlled within 2I.
In an embodiment, in the step S4, the blank after the second finish rolling is straightened, so as to obtain the lead frame etching material with a vickers hardness fluctuation range within 10Hv, a tensile strength fluctuation range within 10MPa, and a plate type fluctuation range within 2I.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
according to the production method of the lead frame etching material, the blank is subjected to multiple finish rolling, annealing is performed after the first finish rolling, and the finish rolling processing rate of each blank is reasonably controlled, so that the lead frame etching material with stable hardness and tensile strength performance is prepared.
Detailed Description
In order that the present application may be understood, a more complete description of the present application will be provided with reference to the examples below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
Example 1
Step S1, preparing a finish rolling blank:
annealing the hot rolled blank with the thickness of 2.0mm at 550 ℃ after milling the surface to obtain an open blank;
finish rolling the cogged ingot to 0.7mm thickness, and annealing at 450 ℃ to obtain a finish rolling ingot;
s2, performing primary finish rolling on the finish rolled blank to 0.25mm, and annealing at 600 ℃ to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 64%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 18.8%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
Example 2
Step S1, preparing a finish rolling blank:
annealing the hot rolled blank with the thickness of 3.0mm at 400 ℃ after milling the surface to obtain an open blank;
finish rolling the cogged ingot to 0.7mm thickness, and annealing at 350 ℃ to obtain a finish rolling ingot;
s2, performing primary finish rolling on the finish rolled blank to 0.35mm, and annealing at 500 ℃ to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 30%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
Example 3
Step S1, preparing a finish rolling blank:
annealing the hot rolled blank with the thickness of 1.0mm at 400 ℃ after milling the surface to obtain an open blank;
finish rolling the cogged ingot to 0.5mm thickness, and annealing at 300 ℃ to obtain a finish rolling ingot;
s2, performing primary finish rolling on the finish rolled blank to 0.15mm, and annealing at 600 ℃ to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 70%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 10%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
Example 4
Step S1, preparing a finish rolling blank:
annealing the hot rolled blank with the thickness of 2.5mm at 700 ℃ after milling the surface to obtain an open blank;
finish rolling the cogged ingot to 1.5mm thickness, and annealing at 450 ℃ to obtain a finish rolling ingot;
s2, performing primary finish rolling on the finish rolled blank to 0.30mm, and annealing at 600 ℃ to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 80%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 25%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
Example 5
Step S1, preparing a finish rolling blank:
annealing the hot rolled blank with the thickness of 2.0mm at 650 ℃ after milling the surface to obtain an open blank;
finish rolling the cogged ingot to 0.7mm thickness, and annealing at 600 ℃ to obtain a finish rolling ingot;
s2, performing primary finish rolling on the finish rolled blank to 0.2mm, and annealing at 700 ℃ to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 71.4%;
s3, performing secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 15%;
and S4, straightening the blank after the second finish rolling to obtain the lead frame etching material.
Comparative example 1
The annealing method prepares a lead frame etching material.
Comparative example 2
The method for preparing the lead frame etching material with small processing rate.
Table 1 comparison of properties of lead frame etching materials prepared in examples and comparative examples
In summary, by adopting the multiple finish rolling and annealing method provided by the application, the hardness and strength fluctuation of the finally prepared lead frame etching material are small, the plate shape is controlled within 2I, and the etching requirement of the lead frame is met.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method of producing an etched material for a lead frame, comprising the steps of:
preparing a finish rolling blank;
carrying out primary finish rolling and annealing treatment on the finish rolled blank to obtain a blank after primary finish rolling, wherein the processing rate of the primary finish rolling is 50% -80%;
carrying out secondary finish rolling treatment on the blank after the primary finish rolling to obtain a blank after the secondary finish rolling, wherein the processing rate of the secondary finish rolling is 10% -30%;
straightening the blank after the second finish rolling to obtain the lead frame etching material.
2. The method for producing a lead frame etching material according to claim 1, wherein the step of producing a finish-rolled blank comprises the steps of:
the hot rolled blank is subjected to cogging annealing after milling, and a cogged blank is prepared;
and (5) carrying out finish rough rolling on the blank to obtain a finish rolling blank.
3. The method of producing a lead frame etching material according to claim 2, wherein in the step of producing a green compact by subjecting the hot rolled blank to a milling and then to a cogging annealing, the annealing temperature is 400 ℃ to 700 ℃.
4. The method of producing a lead frame etching material according to claim 2, wherein in the step of producing a green compact by subjecting the hot rolled blank to a milling and then to a cogging annealing, the annealing temperature is 500 ℃ to 600 ℃.
5. The method of producing a lead frame etching material according to claim 2, wherein in the step of forming a blank by cogging and annealing after milling the surface of the hot-rolled blank, the thickness of the blank is 1.0mm to 3.0mm.
6. The method of manufacturing a lead frame etching material according to claim 2, wherein in the step of finish rolling the blank, the annealing temperature is 300 ℃ to 600 ℃.
7. The method of manufacturing a lead frame etching material according to claim 2, wherein in the step of finish rolling the blank, the annealing temperature is 400 ℃ to 500 ℃.
8. The method of producing a lead frame etching material according to claim 1, wherein in the step of subjecting the finish-rolled blank to the first finish rolling and annealing treatment, the annealing temperature is 500 ℃ to 700 ℃.
9. The method for producing a lead frame etching material according to claim 1, wherein in the step of subjecting the finish-rolled blank to the first finish-rolling and annealing treatment, a thickness of the blank after the first finish-rolling is 0.5mm to 1.0mm;
and in the steps of carrying out secondary finish rolling and annealing treatment on the finish rolled blank, the thickness of the blank after the secondary finish rolling is 0.15mm-0.35mm.
10. The method of producing a lead frame etching material according to claim 1, wherein the frame material has a vickers hardness of 10Hv, a tensile strength of 10MPa, and a plate-shape controlled within 2I.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311432280.9A CN117463773A (en) | 2023-10-31 | 2023-10-31 | Method for producing lead frame etching material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311432280.9A CN117463773A (en) | 2023-10-31 | 2023-10-31 | Method for producing lead frame etching material |
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| Publication Number | Publication Date |
|---|---|
| CN117463773A true CN117463773A (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311432280.9A Pending CN117463773A (en) | 2023-10-31 | 2023-10-31 | Method for producing lead frame etching material |
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| Country | Link |
|---|---|
| CN (1) | CN117463773A (en) |
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2023
- 2023-10-31 CN CN202311432280.9A patent/CN117463773A/en active Pending
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