CN111663063A - Lead brass bar suitable for high-speed automatic processing and preparation method thereof - Google Patents
Lead brass bar suitable for high-speed automatic processing and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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Abstract
The invention discloses a lead brass bar suitable for high-speed automatic processing, which comprises, by weight, 57.5-59.5% of Cu, 2.7-3.5% of Pb, 0.01-0.3% of Sn, 0.01-0.3% of Fe, less than or equal to 0.3% of other metal elements, and the balance of zinc and inevitable impurities, wherein the other metal elements are one or more of magnesium, calcium, cerium and phosphorus, and the invention also provides a preparation method of the lead brass bar, wherein the produced lead brass bar has a grain size of 5-15um, a phase ratio of α of 65-85%, and the number of lead particles is more than 12000/1 mm2The lead brass bar has excellent cutting performance, and is suitable for the processing requirements of automation, intellectualization, high speed and precision.
Description
Technical Field
The invention relates to the field of nonferrous metal processing, in particular to a lead brass bar suitable for high-speed automatic processing and a preparation method thereof.
Background
The lead brass rod is widely applied to the fields of machinery, electronics, electrical appliances and the like due to good cutting, drilling and other properties. With the continuous development of the mechanical processing towards automation, intellectualization, high speed and precision, more requirements are put forward on the machinability and the processing consistency of the lead brass bar.
The existing free-cutting lead brass bars, such as HPb58-3, HPb59-1, HPb63-3 and the like, are produced by the following processes: smelting → extrusion → acid cleaning → disc drawing → intermediate annealing → acid cleaning → combined drawing, the lead brass bar produced by the conventional process has better cutting performance and can meet the processing requirement of the conventional lathe. And for high-speed automatic machining, the problems of poor turning, drilling and chip removal, poor machining precision and the like are easy to occur. The problems are caused by that in the conventional production process, the intermediate annealing temperature is high (500-. Further, the chip breaking and chip removal are not easy to happen in the high-speed machining process, and the smoothness and precision of machined products are reduced.
The invention patent CN105821357A discloses a production process of a lead brass bar, which adopts the processes of ingot casting → extrusion → disc drawing and planing skin → continuous drawing and continuous annealing → combined drawing, and the obtained lead brass bar has fine tissue and excellent cutting performance. However, the strength of the lead brass is too low at high temperature, the continuous drawing and continuous annealing operation difficulty is high, and the size of the blank is easy to change. Meanwhile, the continuous drawing and continuous annealing equipment occupies a large area, the mold replacement process is complex, and the practical production and use significance is not great for lead brass products with multiple specifications and small order quantity.
Therefore, the lead brass bar has better machinability and machining consistency, is suitable for high-speed automatic machining, and is easy to break and remove chips in the machining process, so that the lead brass bar is an important research direction.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
In a first aspect, the invention provides a lead brass bar suitable for high-speed automatic processing, which comprises the following components in percentage by weight: 57.5 to 59.5 percent of Cu, 2.7 to 3.5 percent of Pb, 0.01 to 0.3 percent of Sn, 0.01 to 0.3 percent of Fe0.01 to 0.3 percent of other metal elements, and the balance of zinc and inevitable impurities; wherein, the other metal elements are one or more of magnesium, calcium, cerium and phosphorus.
Preferably, the average grain size is 5-15 um.
Preferably, the alpha phase proportion is 65 to 85%.
Preferably, the number of lead particles is more than 12000/1 mm2。
The second aspect of the invention also provides a preparation method of the lead brass bar suitable for high-speed automatic processing, which comprises the following steps:
s1: smelting and casting: mixing and melting the components in proportion, and then producing a cast ingot in a horizontal continuous casting mode; the specification of the ingot is phi 140-250 mm;
s2: extruding: heating the cast ingot, and then peeling and extruding to obtain an extrusion blank, wherein the specification of the extrusion blank is phi 4.5-23.0 mm;
s3: acid washing: soaking the extrusion blank in a sulfuric acid solution for 2-5min, and then washing the extrusion blank with high-pressure water to obtain a rod blank;
s4: and (3) combined drawing: and carrying out combined drawing on the rod blank to obtain the lead brass bar suitable for high-speed automatic processing.
Preferably, the magnesium, calcium and phosphorus elements are added in step 1 in the form of an intermediate alloy with the copper element.
Preferably, the ingot casting in the step S2 adopts a four-section gradient heating mode, the first-section temperature is heated to 350 ℃ at 250 ℃ for 10-30 min; the second stage is heated to 400-500 ℃ for 10-30 min; the temperature of the third section is heated to 550-650 ℃; heating for 5-30 min; the fourth section is heated to the temperature of 630-700 ℃ for 5-20 min.
Preferably, the drawing rate of the combined drawing in the step S4 is controlled to be 8-25%, and the drawing speed is controlled to be 40-80 m/min.
Preferably, the specification of the lead brass bar suitable for high-speed automatic processing in the step S4 is phi 4.0-21.0 mm.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the invention adds alloy elements such as iron, tin, magnesium, calcium, cerium, phosphorus and the like to refine grains, adjusts the morphology of α and β two-phase structures through the microalloying effect of the metal elements, ensures that the α phase structure is in an isolated state while ensuring the α phase proportion, and ensures that the α phase structure is in an isolated state through the extrusion temperature regulation and control of the drawing processing rateThe grain size of the product is 5-15um, the high-temperature heating process in the conventional production process is avoided, and the lead particles of the product are uniformly distributed, dispersed and fine, and tests and actual production prove that the grain size of the product produced by the method is 5-15um, the α phase proportion is 65-85%, and the unit area (1 mm)2) The lead brass bar with the lead particles more than 12000 has excellent cutting performance and is suitable for the processing requirements of automation, intellectualization, high speed and precision.
Detailed Description
The invention provides a lead brass bar suitable for high-speed automatic processing, which comprises the following components in percentage by weight: 57.5 to 59.5 percent of Cu, 2.7 to 3.5 percent of Pb, 0.01 to 0.3 percent of Sn, 0.01 to 0.3 percent of Fe, less than or equal to 0.3 percent of other metal elements, and the balance of zinc and inevitable impurities; wherein, the other metal elements are one or more of magnesium, calcium, cerium and phosphorus.
The invention refines crystal grains by adding alloy elements such as iron, tin, magnesium, calcium, cerium, phosphorus and the like, and particularly, the average grain size is 5-15 um. The morphology of alpha and beta two-phase structures is adjusted through the microalloying effect of the metal elements, the alpha phase structure is isolated while the alpha phase proportion is ensured, and specifically, the alpha phase proportion is 65-85%.
By adjusting and controlling the extrusion temperature and controlling the drawing processing rate, the lead particles of the product are uniformly distributed, dispersed and fine, and particularly, the average grain size is 5-15 mu m.
In order to ensure that the lead particles of the product are uniformly distributed, dispersed and fine, the invention abandons the high-temperature heating process in the conventional production process, adopts a four-section gradient heating mode and combines with combined drawing to ensure that the average grain size of the product is 5-15um, and the quantity of the lead particles is more than 12000/1 mm2。
In summary, the preparation method of the lead brass bar suitable for high-speed automatic processing comprises the following steps:
s1: smelting and casting: mixing and melting the components in proportion, and then producing an ingot by a horizontal continuous casting mode, wherein the specification of the ingot is phi 140 and 250 mm;
s2: extruding: heating the cast ingot, and then peeling and extruding to obtain an extrusion blank, wherein the specification of the extrusion blank is phi 4.5-23.0 mm;
s3: acid washing: soaking the extrusion blank in a sulfuric acid solution for 2-5min, and then washing the extrusion blank with high-pressure water to obtain a rod blank;
s4: and (3) combined drawing: and carrying out combined drawing on the rod blank to obtain the lead brass bar suitable for high-speed automatic processing.
In a particular embodiment, the elements magnesium, calcium and phosphorus are added in step 1 in the form of an intermediate alloy with the element copper.
In a specific embodiment, the ingot in the step S2 is heated in a four-stage gradient manner, wherein the first stage temperature is heated to 350 ℃ for 10-30 min; the second stage is heated to 400-500 ℃ for 10-30 min; the temperature of the third section is heated to 550-650 ℃; heating for 5-30 min; the fourth section is heated to the temperature of 630-700 ℃ for 5-20 min.
In a specific embodiment, the drawing rate of the combined drawing in the step S4 is controlled to be 8-25%, the drawing speed is 40-80m/min, and the specification of the lead brass bar suitable for high-speed automatic processing is phi 4.0-21.0 mm.
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
TABLE 1 chemical composition (wt%) of alloy bars of examples of the invention and comparative examples
| Element(s) | Cu | Pb | Fe | Sn | Mg | Ca | Ce | P | Zn |
| Example 1 | 59.2 | 3.2 | 0.21 | 0.25 | 0.15 | - | - | 0.03 | Balance of |
| Example 2 | 58.4 | 3.3 | 0.15 | 0.21 | - | 0.03 | - | - | Balance of |
| Example 3 | 57.8 | 2.8 | 0.18 | 0.11 | - | - | 0.02 | 0.02 | Balance of |
| Example 4 | 58.8 | 3.0 | 0.11 | 0.14 | 0.08 | - | - | - | Balance of |
| Comparative example 1 | 57.2 | 3.4 | 0.05 | 0.09 | - | - | - | - | Balance of |
| Comparative example 2 | 62.2 | 2.8 | 0.06 | 0.07 | - | - | - | <0.01 | Balance of |
Example 1
The embodiment provides a lead brass bar suitable for high-speed automatic processing, and the preparation method comprises the following steps:
s1: smelting and casting: adding 1# red copper, 2# red copper, copper-iron alloy, brass leftover materials, lead brass scrap materials, tin-phosphor bronze leftover materials, zinc ingots, lead ingots, copper-magnesium alloy and copper-phosphor alloy into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1060 ℃, uniformly stirring after all metals are molten, standing for 20min, and producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 200mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 1200 mm;
s2: extruding: heating the cast ingot in a medium-frequency induction heating furnace by adopting four-section gradient heating, wherein the first-section temperature is heated to 300 ℃, and the heating time is 25 min; heating to 450 deg.C for 25 min; the third-stage temperature is heated to 580 ℃; heating for 20 min; heating to 680 ℃ in the fourth section for 15min, peeling and extruding the heated cast ingot on a 2200T reverse extruder, wherein the specification of an extrusion blank is phi 18.2mm, the number of the extrusion line blanks is 1, and the extrusion blank takes up wires in a disc form;
s3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
s4: and (3) combined drawing: drawing the bar blank on an 8T combined drawing machine at a drawing speed of 50m/min to draw out a lead brass bar with the specification of phi 17.1 mm;
s5: and (6) inspecting and warehousing the finished product.
The inspection results are shown in table 2, and the lead brass bar obtained by the production and processing technology has the advantages of fine grain size, dispersed and uniform lead particle distribution and excellent cutting performance.
Example 2
The embodiment provides a lead brass bar suitable for high-speed automatic processing, and the preparation method comprises the following steps:
s1: smelting and casting: adding 1# red copper, 2# red copper, copper-iron alloy, brass leftover materials, lead brass scrap materials, tin-phosphor bronze leftover materials, zinc ingots, lead ingots and copper-calcium alloy into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1040 ℃, uniformly stirring after all metals are molten, standing for 20min, and producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 145mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 500 mm;
s2: extruding: heating the cast ingot in a medium-frequency induction heating furnace by adopting four-section gradient heating, wherein the first-section temperature is heated to 300 ℃, and the heating time is 15 min; heating to 450 ℃ in the second stage for 15 min; the third-stage temperature is heated to 550 ℃; heating for 10 min; heating to 640 ℃ in the fourth section for 10min, peeling and extruding the heated cast ingot on a 1250T reverse extruder, wherein the specification of an extrusion blank is phi 6.2mm, the number of the extrusion line blanks is 2, and the extrusion blank is taken up in a disc form;
s3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
s4: and (3) combined drawing: drawing the bar blank on a 2T combined drawing machine at a drawing speed of 80m/min to draw out a lead brass bar with the specification of phi 5.6 mm;
s5: and (6) inspecting and warehousing the finished product.
The inspection results are shown in table 2, and the lead brass bar obtained by the production and processing technology has the advantages of fine grain size, dispersed and uniform lead particle distribution and excellent cutting performance.
Example 3
The embodiment provides a lead brass bar suitable for high-speed automatic processing, and the preparation method comprises the following steps:
s1: smelting and casting: adding 1# red copper, 2# red copper, copper-iron alloy, brass leftover materials, lead brass scrap materials, tin-phosphor bronze leftover materials, zinc ingots, lead ingots, mixed rare earth and copper-phosphor alloy into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1040 ℃, uniformly stirring after all metals are molten, standing for 20min, and producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 200mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 1200 mm;
s2: extruding: heating the cast ingot in a medium-frequency induction heating furnace by adopting four-section gradient heating, wherein the first-section temperature is heated to 300 ℃, and the heating time is 25 min; heating to 450 deg.C for 25 min; the third-stage temperature is heated to 550 ℃; heating for 20 min; heating to 620 ℃ in the fourth section for 15min, peeling and extruding the heated cast ingot on a 2200T reverse extruder, wherein the specification of an extrusion blank is phi 11mm, the number of the extrusion line blanks is 2, and the extrusion blank takes up a disc form;
s3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
s4: and (3) combined drawing: drawing the bar blank on a 2T combined drawing machine at a drawing speed of 60m/min to draw out a lead brass bar with the specification of phi 10.3 mm;
s5: and (6) inspecting and warehousing the finished product.
The inspection results are shown in table 2, and the lead brass bar obtained by the production and processing technology has the advantages of fine grain size, dispersed and uniform lead particle distribution and excellent cutting performance.
Example 4
The embodiment provides a lead brass bar suitable for high-speed automatic processing, and the preparation method comprises the following steps:
s1: smelting and casting: adding 1# red copper, 2# red copper, copper-iron alloy, brass leftover materials, lead brass scrap materials, tin-phosphor bronze leftover materials, zinc ingots, lead ingots and copper-magnesium alloy into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1040 ℃, uniformly stirring after all metals are molten, standing for 20min, and producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 250mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 800 mm;
s2: extruding: heating the cast ingot in a medium-frequency induction heating furnace by adopting four-section gradient heating, wherein the first-section temperature is heated to 300 ℃, and the heating time is 30 min; heating to 450 deg.C for 25 min; the third-stage temperature is heated to 580 ℃; heating for 25 min; heating to 640 ℃ in the fourth section for 15min, peeling and extruding the heated cast ingot on a 3150T reverse extruder, wherein the specification of an extrusion blank is phi 15mm, the number of the extrusion line blanks is 2, and the extrusion blank takes up wires in a disc form;
s3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
s4: and (3) combined drawing: drawing the bar blank on a 2T combined drawing machine at a drawing speed of 50m/min to draw out a lead brass bar with the specification of phi 13.9 mm;
s5: and (6) inspecting and warehousing the finished product.
The inspection results are shown in table 2, and the lead brass bar obtained by the production and processing technology has the advantages of fine grain size, dispersed and uniform lead particle distribution and excellent cutting performance.
Comparative example 1
The comparative example provides an HPb58-3 lead brass alloy bar, the method of making including the steps of:
a1: smelting and casting: adding 1# red copper, 2# red copper, brass leftover materials, lead brass scrap materials, zinc ingots and lead ingots into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1030 ℃, uniformly stirring after all metals are molten, standing for 20min, and then producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 200mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 1200 mm;
a2: extruding: heating the cast ingot to 640 ℃ in a medium-frequency induction furnace for 60min, peeling and extruding the heated cast ingot on a 2200T reverse extruder, wherein the specification of an extrusion blank is phi 15.8mm, the number of the extrusion line blanks is 1, and the extrusion blank takes up wires in a disc form;
a3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
a4: coiling: the rod blank is coiled and pulled on an inverted drawing machine, the drawing speed is 70m/min, and the outgoing line specification is phi 15.1 mm;
a5: intermediate annealing: placing the pulled blank in a bell-type furnace for annealing treatment, wherein the annealing temperature is 510 ℃, the temperature rise time is 2.5h, the heat preservation time is 3h, and cooling along with the furnace is carried out; .
A6: acid washing: and (3) soaking the annealed blank in acid liquor containing 20% of sulfuric acid for 6min at normal temperature, and washing the blank with high-pressure water.
A7: and (3) combined drawing: and drawing the pickled blank on an 8T combined drawing machine at the drawing speed of 50m/min to draw out the HPb58-3 lead brass bar with the specification of phi 14.2 mm.
A8: and (6) inspecting and warehousing the finished product.
The test results are shown in table 2, and the HPb58-3 lead brass bar obtained by the production and processing technology has the advantages of large grain size, uneven distribution of lead particles, different particle sizes and general cutting performance.
Comparative example 2
The comparative example provides an HPb63-3 lead brass alloy bar, the method of making including the steps of:
b1: smelting and casting: adding 1# red copper, 2# red copper, brass leftover materials, lead brass scrap materials, zinc ingots and lead ingots into an induction furnace in batches according to the proportion in Table 1 for smelting at the smelting temperature of 1100 ℃, uniformly stirring after all metals are molten, standing for 20min, and then producing cast ingots in a horizontal continuous casting mode, wherein the specification of the cast ingots is phi 200mm, and the cast ingots are sawn on a semi-automatic horizontal metal band sawing machine, and the sawing length is 1200 mm;
b2: extruding: heating the cast ingot to 720 ℃ in a medium-frequency induction furnace for 90min, peeling and extruding the heated cast ingot on a 2200T reverse extruder, wherein the specification of an extrusion blank is phi 10.2mm, the number of the extrusion line blanks is 2, and the extrusion blank takes up wires in a disc form;
b3: connecting the extruded blanks, soaking in acid solution containing 20% of sulfuric acid at normal temperature for 3min, and washing with high-pressure water to obtain rod blanks;
b4: coiling: the bar blank is coiled and pulled on an inverted drawing machine, the drawing speed is 70m/min, and the outgoing line specification is phi 9.5 mm;
b5: intermediate annealing: placing the pulled blank in a bell-type furnace for annealing treatment, wherein the annealing temperature is 560 ℃, the temperature rise time is 2.5h, the heat preservation time is 3h, and cooling along with the furnace is carried out; .
B6: acid washing: soaking the annealed blank in acid solution containing 20% of sulfuric acid for 6min at normal temperature, and washing the blank with high-pressure water;
b7: coiling: coiling the pickled blank on an inverted drawing machine at a coiling speed of 80m/min and an outlet specification phi of 8.8 mm;
b8: intermediate annealing: placing the coiled blank into a bell-type furnace for annealing treatment, wherein the annealing temperature is 510 ℃, the temperature rise time is 2.5h, the heat preservation time is 3h, and cooling along with the furnace is carried out; .
B9: acid washing: soaking the annealed blank in acid solution containing 20% of sulfuric acid for 6min at normal temperature, and washing the blank with high-pressure water;
b10: and (3) combined drawing: and drawing the pickled blank on a 4T combined drawing machine at the drawing speed of 60m/min to draw out the HPb63-3 lead brass bar with the specification of phi 8.1 mm.
B11: and (6) inspecting and warehousing the finished product.
The test results are shown in table 2, and the HPb63-3 lead brass bar obtained by the production and processing technology has the advantages of large grain size, uneven distribution of lead particles, different particle sizes and general cutting performance.
TABLE 2 examination results of lead brass bars of the examples of the invention and of the comparative examples
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (10)
1. The lead brass bar suitable for high-speed automatic processing is characterized by comprising the following components in percentage by weight: 57.5 to 59.5 percent of Cu, 2.7 to 3.5 percent of Pb, 0.01 to 0.3 percent of Sn, 0.01 to 0.3 percent of Fe, less than or equal to 0.3 percent of other metal elements, and the balance of zinc and inevitable impurities; wherein, the other metal elements are one or more of magnesium, calcium, cerium and phosphorus.
2. The lead brass bar suitable for high speed automated processing of claim 1, wherein the average grain size is 5-15 um.
3. The lead brass bar suitable for high speed automated processing of claim 1, wherein the alpha phase ratio is 65-85%.
4. The lead brass bar suitable for high speed automated processing of claim 1, wherein the number of lead particles is greater than 12000 per 1mm2。
5. A method for the preparation of a lead brass bar suitable for high speed automated processing according to any of claims 1 to 4, comprising the following steps:
s1: smelting and casting: mixing and melting the components in proportion, and then producing an ingot by a horizontal continuous casting mode, wherein the specification of the ingot is phi 140 and 250 mm;
s2: extruding: heating the cast ingot, and then peeling and extruding to obtain an extrusion blank, wherein the specification of the extrusion blank is phi 4.5-23.0 mm;
s3: acid washing: soaking the extrusion blank in a sulfuric acid solution for 2-5min, and then washing the extrusion blank with high-pressure water to obtain a rod blank;
s4: and (3) combined drawing: and carrying out combined drawing on the rod blank to obtain the lead brass bar suitable for high-speed automatic processing.
6. The method according to claim 5, wherein the magnesium, calcium and phosphorus elements are added in step 1 in the form of an intermediate alloy with the copper element.
7. The method as claimed in claim 5, wherein the ingot in step S2 is heated to 350 ℃ for 10-30min in a four-stage gradient heating manner at the first stage; the second stage is heated to 400-500 ℃ for 10-30 min; the temperature of the third section is heated to 550-650 ℃; heating for 5-30 min; the fourth section is heated to the temperature of 630-700 ℃ for 5-20 min.
8. The manufacturing method according to claim 5, wherein the drawing rate of the combined drawing in step S4 is 8-25%.
9. The production method according to claim 5, wherein the drawing speed of the combined drawing in step S4 is 40 to 80 m/min.
10. The method of claim 5, wherein the lead brass bar suitable for high speed automated processing in step S4 has a gauge of 4.0-21.0 mm.
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| CN113981268A (en) * | 2021-10-29 | 2022-01-28 | 宁波金田铜业(集团)股份有限公司 | Preparation method of brass wire |
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