A lead brass rod suitable for high-speed automatic processing and its preparation method

A lead brass, high-speed technology, applied in the field of lead brass rods and its preparation, can solve the problems of lead brass low strength, small order quantity, large area occupied by continuous pulling and unwinding equipment, etc., and achieve excellent cutting performance , evenly distributed effect

Active Publication Date: 2022-04-01
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of lead brass at high temperature is too low, the operation of continuous pulling and retreating is difficult, and the size of the blank is easy to change
At the same time, the continuous pulling and unwinding equipment occupies a large area, and the mold replacement process is complicated. For lead brass products with multiple specifications and small order quantities, the actual production and use are of little significance

Method used

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  • A lead brass rod suitable for high-speed automatic processing and its preparation method

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preparation example Construction

[0026] In summary, the preparation method of the lead brass rod suitable for high-speed automatic processing in the present invention comprises the following steps:

[0027] S1: Smelting and casting: After mixing and melting each component in proportion, an ingot is produced by horizontal continuous casting, and the specification of the ingot is Φ140-250mm;

[0028] S2: Extrusion: peeling and extruding the ingot after heating to obtain an extruded billet, the specification of the extruded billet is Φ4.5-23.0 mm;

[0029] S3: pickling: soak the extruded billet in a sulfuric acid solution for 2-5 minutes, rinse it with high-pressure water, and obtain a rod billet;

[0030] S4: combined drawing: performing combined drawing on the rod blank to obtain the lead brass rod suitable for high-speed automatic processing.

[0031] In a specific embodiment, in step 1, magnesium, calcium and phosphorus are added in the form of an intermediate alloy with copper.

[0032] In a specific embo...

Embodiment 1

[0038] This embodiment provides a lead brass rod suitable for high-speed automatic processing, and its preparation method includes the following steps:

[0039] S1: Smelting and casting: 1# red copper, 2# red copper, copper-iron alloy, brass scraps, lead brass scraps, tin-phosphorus bronze scraps, zinc ingots, lead ingots, copper-magnesium alloys, copper-phosphorus Alloys are added to the induction furnace in batches for melting. The melting temperature is 1060°C. After the metal is completely melted, it is stirred evenly. After standing for 20 minutes, the ingot is produced by horizontal continuous casting. The ingot size is Φ200mm. Sawing on the band sawing machine, the sawing length is 1200mm;

[0040] S2: Extrusion: The ingot is heated in a medium-frequency induction heating furnace, and the heating adopts four stages of gradient heating. The temperature of the first stage is heated to 300°C, and the heating time is 25 minutes; the temperature of the second stage is heated...

Embodiment 2

[0046] This embodiment provides a lead brass rod suitable for high-speed automatic processing, and its preparation method includes the following steps:

[0047] S1: Melting and casting: 1# red copper, 2# red copper, copper-iron alloy, brass scrap, lead brass shavings, tin phosphor bronze scrap, zinc ingot, lead ingot, copper-calcium alloy in batches according to the ratio in Table 1 Put it into an induction furnace for melting, the melting temperature is 1040°C, stir evenly after all the metal is melted, and after standing for 20 minutes, produce ingots by horizontal continuous casting, the ingot size is Φ145mm, and the ingots are cast on a semi-automatic horizontal metal band saw Sawing, sawing length 500mm;

[0048] S2: Extrusion: The ingot is heated in a medium-frequency induction heating furnace, and the heating adopts four stages of gradient heating. The temperature of the first stage is heated to 300°C, and the heating time is 15 minutes; the temperature of the second stag...

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Abstract

The invention discloses that the invention provides a lead brass rod suitable for high-speed automatic processing, which comprises the following components by weight percentage: Cu 57.5-59.5%, Pb 2.7-3.5%, Sn 0.01-0.3%, Fe 0.01-0.3%, other metal elements ≤ 0.3%, the balance is zinc and unavoidable impurities; wherein, other metal elements are one or more of magnesium, calcium, cerium, phosphorus; the present invention also provides the lead Process for the preparation of brass rods. The grain size produced by the invention is 5-15um, the α-phase ratio is 65-85%, and the number of lead particles is greater than 12000 / 1mm 2 Leaded brass rods with excellent cutting performance are suitable for automation, intelligence, high-speed and precision processing requirements.

Description

technical field [0001] The invention relates to the field of nonferrous metal processing, in particular to a lead brass rod suitable for high-speed automatic processing and a preparation method thereof. Background technique [0002] Lead brass rods are widely used in machinery, electronics, electrical appliances and other fields because of their good cutting and drilling properties. With the continuous development of mechanical processing in the direction of automation, intelligence, high speed and precision, more requirements are put forward for the machinability and processing consistency of lead brass rods. [0003] The existing free-cutting lead brass rods, such as HPb58-3, HPb59-1, HPb63-3, etc., the production process includes: smelting → extrusion → pickling → coil drawing → intermediate annealing → pickling → combined drawing Pull, the lead brass bar produced by this conventional process has good cutting performance and can meet the processing requirements of conven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04C22F1/08C22C1/03
CPCC22C9/04C22F1/08C22C1/03
Inventor 傅杰刘喆郑恩奇
Owner JINTIAN COPPER GROUP CORP NINGBO
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