CN105316520A - Preparation method of Cu-Ni-Sn plate strip - Google Patents
Preparation method of Cu-Ni-Sn plate strip Download PDFInfo
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Abstract
The invention relates to the field of copper alloys, particularly relates to a preparation method of a Cu-Ni-Sn plate strip, solves the technical problem that the final tensile strength, yield strength and hardness of the copper alloy of lead frames in the prior art cannot meet the production standard requirements, and adopts the theories of solution strengthening, precipitation strengthening and work hardening. Hot rolling solution treatment is characterized in that the solubility of solute atoms is high at the high temperature, the solute atoms exist in base copper in form of solid solution, the solute elements are not precipitated in time after quickly cooling and form saturated solid solution; during the precipitation strengthening process, the solubility of Ni and Sn atoms in the copper are rapidly reduced and are precipitated from a substrate, and the substrate is diluted; during cold rolling process, the copper alloy plate strip generates plastic deformation, grains slip and entwist in a dislocation manner, so that the grains are elongated, crushed and fibered. Through the preparation method of the Cu-Ni-Sn plate strip, the requirements of high strength, high yield and high hardness can be achieved, so that the final tensile strength, yield strength and hardness of the TKA copper alloy plate strip are improved.
Description
Technical field
The present invention relates to copper alloy field, particularly relate to a kind of preparation method of Cu-Ni-Sn copper alloy plate strip.
Background technology
Along with the high speed development of science and technology, more and more higher to the tensile strength of the lead frame of electronic chip Cu alloy material used, the performance requriements such as yield strength and hardness, the tensile strength Rm of desirable copper alloy for lead-wire frame desired is at present 530-640MPa, yield strength Rp0.2 >=520MPa, elongation after fracture A11.3 >=6%, vickers hardness hv is 160-195(vickers hardness number, without unit), HV >=140 after softening.
At present, the domestic main raw for lead frame is Cu-Fe-P system's alloy (C19400, C19210) and Cu-Ni-Si alloy (C70250).Existing copper alloy for lead-wire frame Problems existing is: 1, the tensile strength of existing Cu-Fe-P system alloy (C19400, C19210) is 420-500MPa, does not reach the technical requirements of high-grade lead frame.2, existing Cu-Ni-Si alloy (C70250) because of nickel content higher, founding hot rolling production difficulty is comparatively large, and good article rate is lower, and material cost is too high.
Summary of the invention
The present invention can not meet in order to what solve the final tensile strength of existing copper alloy for lead-wire frame, yield strength and hardness the technical problem that production standard requires, provides a kind of preparation method of Cu-Ni-Sn copper alloy (TKA) strip.
The present invention adopts following technical scheme to realize: a kind of preparation scheme of Cu-Ni-Sn copper alloy (TKA) strip, comprises the steps:
(1), according to the useful volume of commercial frequency cored induction furnace, be copper according to mass ratio: tin: nickel: phosphorus: zinc=97.43:1.5:0.8:0.07:0.2 prepares burden; Cover at bath surface the calcining charcoal that a layer thickness is 150-200mm after copper, tin, nickel, phosphor bronze alloy, zinc are put into the body of heater of commercial frequency cored induction furnace, be heated to 1170-1210 DEG C and carry out melting, be incubated 30 minutes, then fully stir and obtain melting water (melting water is also referred to as copper water);
(2), adopt to above-mentioned melting water, the crystallizer of band graphite inner sleeve carries out that temperature is 1170 DEG C-1210 DEG C, to obtain thickness be 150mm to the semicontinuous casting technique of casting speed 2.4-3.0 m/h, width is the rectangle ingot casting of 400mm;
(3), above-mentioned rectangle ingot casting is put into coal gas continuous heating furnace and after 920-940 DEG C, be incubated 2-2.5 hour by room temperature heating 3 is little again; The two roller reversible hot milling rolls again ingot casting hot rolling track being installed in up and down line refrigerating unit carry out the 7 passage reversible rollings that breaking down temperature is 920-940 DEG C, finishing temperature is 700-730 DEG C; Last passage goes out to roll rear opening installation and carries out in the on-line cooling device that hot rolling track is upper and lower the online water-cooled of made-up belt that speed of cooling is 10 DEG C/s, is cooled to direct for hot rolling base hollow clot after room temperature;
(4), the hot rolling base after above-mentioned clot is carried out upper and lower milling thickness with Double Milling turning equipment after uncoiling on Abrollhaspel be the Double Milling face of 0.8-1mm to remove the oxide skin on hot rolling base surface, obtain strip;
(5), four roller reversing cogging mills above-mentioned strip are adopted to carry out 9 passage reversible rollings; The annealing process that Heating temperature is 530 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with bell jar annealing furnace;
(6), the reversible middle milling train of four rollers the strip after the annealing in step (5) is adopted to carry out 4 passage reversible rollings; The annealing process that Heating temperature is 480 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with bell jar annealing furnace;
(7), four roller reversing finishing mills are adopted to carry out 5 passage reversible rollings the strip after annealing in step (6); The annealing process that Heating temperature is 600 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with continuous copper strip bright annealing furnace;
(8), four roller reversing finishing mills are adopted to carry out 3 passage reversible rollings the strip after annealing in step (7); Carry out stretch-bending straightening technique with stretch bending-straightening machine again, thus obtain TKA copper alloy plate strip used for lead frame.
Described commercial frequency cored induction furnace, graphite inner sleeve crystallizer, two roller reversible hot milling rolls, Abrollhaspel, Double Milling turning equipment, four roller reversing cogging mills, the reversible middle milling train of four rollers, four roller reversing finishing mills, bell jar annealing furnace, continuous copper strip bright annealing furnace, stretch bending-straightening machine are currently available products, can directly buy from market.
The melting water crucible obtained in above-mentioned preparation process (1) is sampled, after pour graphite mo(u)ld into, be cooled to solid-state after remove bottom zone of oxidation, spectrum analyzer carries out chemical analysis, and its result is as shown in table 1 below.
Preparation method of the present invention make use of solution strengthening (alloying element is solid-solution in matrix metal and causes lattice distortion to a certain degree thus the phenomenon that alloy strength is improved), precipitation strength (precipitation strength, also precipitation strength is claimed, refer to metal in supersaturated solid solution Segregation solute atom district or by precipitation go out particulate Dispersed precipitate in matrix, lead scleratogenous a kind of thermal treatment process) and work hardening (also claim cold working hardening, refer to metallic substance below recrystallization temperature during viscous deformation intensity and hardness raise, and the phenomenon that plasticity and toughness reduce) theory.Adopt hot rolling solution treatment (step 3), when utilizing high temperature, solute atoms solubleness is higher, and be present in Ji Tongzhong with solid solution thereof, after cooling, solute element has little time to separate out fast, forms supersaturated solid solution; In precipitation strength process (step 5 ~ 8), the solubleness of Ni, Sn atom in copper sharply declines, and separates out, matrix dilution from matrix; In cold-rolled process (step 5 ~ 8), copper alloy plate strip produces viscous deformation, and the entanglement of dislocation, appears in crystal grain generation slippage, makes crystal grain elongation, broken and fibrosis.Achieve high strength, high surrender, high rigidity requirement, thus improve final tensile strength, yield strength, the hardness of TKA copper alloy plate strip.
The TKA copper alloy plate carries product that the present invention obtains is EH state product, and its property indices sees the following form shown in 2.
TKA copper alloy plate strip preparation method of the present invention, mainly through adjustment Ni, Sn multi-element chemical composition, improves founding, and improves casting quality, reduces product air holes, the defect such as loose; Production technique adopts cold rolling process to improve intensity, and annealing operation eliminates work hardening; Desirable high strength and high flexibility Cu-Ni-Sn Cu alloy material performance is obtained by final cold working and process of eliminating stress.
Embodiment
The preparation method of TKA copper alloy plate strip, comprises the steps:
(1), according to the useful volume of commercial frequency cored induction furnace, be copper according to mass ratio: tin: nickel: phosphorus: zinc=97.43:1.5:0.8:0.07:0.2 prepares burden; Body of heater post-heating copper, tin, nickel, phosphor bronze alloy, zinc being put into commercial frequency cored induction furnace covers at bath surface the calcining charcoal that a layer thickness is 150-200mm after 1170-1210 DEG C (1170 DEG C, 1190 DEG C, 1210 DEG C) carry out melting, be incubated 30 minutes, then fully stir and obtain melting water (melting water is also referred to as copper water);
(2) temperature is 1170 DEG C-1210 DEG C (1170 DEG C, 1190 DEG C, 1210 DEG C), the semicontinuous casting technique of casting speed 2.4-3.0 m/h (2.4 ms/h, 2.7 ms/h, 3.0 ms/h) obtains the rectangle ingot casting that thickness is 150mm, width is 400mm, to adopt the crystallizer of band graphite inner sleeve to carry out above-mentioned copper water;
(3), above-mentioned rectangle ingot casting is put into coal gas continuous heating furnace to heat 3 by room temperature and littlely after 920-940 DEG C (920 DEG C, 930 DEG C, 940 DEG C), be incubated 2-2.5 hour again; The two roller reversible hot milling rolls again ingot casting hot rolling track being all installed in up and down line refrigerating unit carry out the 7 passage reversible rollings that breaking down temperature is 920-940 DEG C (920 DEG C, 930 DEG C, 940 DEG C), finishing temperature is 700-730 DEG C (700 DEG C, 715 DEG C, 730 DEG C); Last passage goes out to roll rear opening installation and carries out in the on-line cooling device that hot rolling track is upper and lower the online water-cooled of made-up belt that speed of cooling is 10 DEG C/s, is cooled to direct for hot rolling base hollow clot after room temperature;
(4), above-mentioned hot rolling base is carried out upper and lower milling thickness with Double Milling turning equipment after uncoiling on Abrollhaspel be the Double Milling face of 0.8-1mm to remove the oxide skin on hot rolling base surface, obtain strip;
(5), four roller reversing cogging mills above-mentioned strip are adopted to carry out 9 passage reversible rollings (under room temperature); The annealing process that Heating temperature is 530 DEG C, the heating-up time is 5 hours, soaking time is 6 hours, tapping temperature is 40 DEG C-50 DEG C (40 DEG C, 45 DEG C, 50 DEG C) is carried out again with bell jar annealing furnace;
(6), by 4 passage reversible rollings (under room temperature) that the strip after annealing in step (5) adopts the reversible middle milling train of four rollers to carry out; The annealing process that Heating temperature is 480 DEG C, the heating-up time is 5 hours, soaking time is 6 hours, tapping temperature is 40 DEG C-50 DEG C (40 DEG C, 45 DEG C, 50 DEG C) is carried out again with bell jar annealing furnace;
(7), four roller reversing finishing mills are adopted to carry out 5 passage reversible rollings (under room temperature) strip after annealing in step (6); The annealing process that Heating temperature is 600 DEG C, the heating-up time is 5 hours, soaking time is 6 hours, tapping temperature is 40 DEG C-50 DEG C (40 DEG C, 45 DEG C, 50 DEG C) is carried out again with continuous copper strip bright annealing furnace;
(8), four roller reversing finishing mills are adopted to carry out 3 passage reversible rollings (under room temperature) strip after annealing in step (7); Carry out stretch-bending straightening technique with stretch bending-straightening machine again, thus obtain TKA copper alloy plate strip.
The temperature of the first passage in step (3) ~ the 7th passage hot rolling is declined to finishing temperature gradually by the temperature of breaking down, and every time temperature all reduces than front a time.
Claims (1)
1. a preparation method for Cu-Ni-Sn copper alloy plate strip, is characterized in that, comprises the steps:
(1), according to the useful volume of commercial frequency cored induction furnace, be copper according to mass ratio: tin: nickel: phosphorus: zinc=97.43:1.5:0.8:0.07:0.2 prepares burden; Cover at bath surface the calcining charcoal that a layer thickness is 150-200mm after copper, tin, nickel, phosphor bronze alloy, zinc are put into the body of heater of commercial frequency cored induction furnace, be heated to 1170-1210 DEG C and carry out melting, be incubated 30 minutes, then fully stir and obtain melting water;
(2), adopt to above-mentioned melting water, the crystallizer of band graphite inner sleeve carries out that temperature is 1170 DEG C-1210 DEG C, to obtain thickness be 150mm to the semicontinuous casting technique of casting speed 2.4-3.0 m/h, width is the rectangle ingot casting of 400mm;
(3), above-mentioned rectangle ingot casting is put into coal gas continuous heating furnace to heat 3 by room temperature and littlely after 920-940 DEG C, be incubated 2-2.5 hour again; The two roller reversible hot milling rolls again ingot casting hot rolling track being installed in up and down line refrigerating unit carry out the 7 passage reversible rollings that breaking down temperature is 920-940 DEG C, finishing temperature is 700-730 DEG C; Last passage goes out to roll rear opening installation and carries out in the on-line cooling device that hot rolling track is upper and lower the online water-cooled of made-up belt that speed of cooling is 10 DEG C/s, is cooled to direct for hot rolling base hollow clot after room temperature;
(4), the hot rolling base after above-mentioned clot is carried out upper and lower milling thickness with Double Milling turning equipment after uncoiling on Abrollhaspel be the Double Milling face of 0.8-1mm to remove the oxide skin on hot rolling base surface, obtain strip;
(5), four roller reversing cogging mills above-mentioned strip are adopted to carry out 9 passage reversible rollings; The annealing process that Heating temperature is 530 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with bell jar annealing furnace;
(6), the reversible middle milling train of four rollers the strip after the annealing in step (5) is adopted to carry out 4 passage reversible rollings; The annealing process that Heating temperature is 480 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with bell jar annealing furnace;
(7), four roller reversing finishing mills are adopted to carry out 5 passage reversible rollings the strip after annealing in step (6); The annealing process that Heating temperature is 600 DEG C, tapping temperature is 40 DEG C-50 DEG C is carried out again with continuous copper strip bright annealing furnace;
(8), four roller reversing finishing mills are adopted to carry out 3 passage reversible rollings the strip after annealing in step (7); Carry out stretch-bending straightening technique with stretch bending-straightening machine again, thus obtain TKA copper alloy plate strip used for lead frame.
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Cited By (9)
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| CN107142393A (en) * | 2017-05-11 | 2017-09-08 | 太原晋西春雷铜业有限公司 | A kind of low stress copper chromium titanium silicon band and preparation method thereof |
| CN108165786A (en) * | 2018-01-26 | 2018-06-15 | 宁波华成阀门有限公司 | A kind of high fluidity Perking brass and its manufacturing method |
| CN108453222A (en) * | 2018-03-12 | 2018-08-28 | 东北大学 | A kind of minimizing preparation method of Copper-Nickel-Aluminium Alloy strip |
| CN112322917A (en) * | 2020-10-16 | 2021-02-05 | 山西春雷铜材有限责任公司 | Preparation method of Cu-Cr-Si-Ti copper alloy plate strip |
| CN112725657A (en) * | 2020-12-24 | 2021-04-30 | 国工恒昌新材料沧州有限公司 | Preparation method of C70350 nickel-silicon bronze strip |
| CN112795810A (en) * | 2020-12-25 | 2021-05-14 | 国工恒昌新材料沧州有限公司 | Preparation method of C70250 nickel-silicon bronze strip |
| CN113699401A (en) * | 2021-08-31 | 2021-11-26 | 山西春雷铜材有限责任公司 | Preparation method of high-strength high-bending copper-nickel-silicon alloy strip |
| CN113789459A (en) * | 2021-09-02 | 2021-12-14 | 宁波博威合金材料股份有限公司 | Copper-nickel-tin alloy and preparation method and application thereof |
| CN116197235A (en) * | 2023-04-28 | 2023-06-02 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107142393A (en) * | 2017-05-11 | 2017-09-08 | 太原晋西春雷铜业有限公司 | A kind of low stress copper chromium titanium silicon band and preparation method thereof |
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| CN108453222A (en) * | 2018-03-12 | 2018-08-28 | 东北大学 | A kind of minimizing preparation method of Copper-Nickel-Aluminium Alloy strip |
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| CN112725657A (en) * | 2020-12-24 | 2021-04-30 | 国工恒昌新材料沧州有限公司 | Preparation method of C70350 nickel-silicon bronze strip |
| CN112795810A (en) * | 2020-12-25 | 2021-05-14 | 国工恒昌新材料沧州有限公司 | Preparation method of C70250 nickel-silicon bronze strip |
| CN113699401A (en) * | 2021-08-31 | 2021-11-26 | 山西春雷铜材有限责任公司 | Preparation method of high-strength high-bending copper-nickel-silicon alloy strip |
| CN113789459A (en) * | 2021-09-02 | 2021-12-14 | 宁波博威合金材料股份有限公司 | Copper-nickel-tin alloy and preparation method and application thereof |
| CN113789459B (en) * | 2021-09-02 | 2022-07-12 | 宁波博威合金材料股份有限公司 | Copper-nickel-tin alloy and preparation method and application thereof |
| CN116197235A (en) * | 2023-04-28 | 2023-06-02 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
| CN116197235B (en) * | 2023-04-28 | 2023-06-30 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
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