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Lead-free free-cutting silicon brass alloy and preparation method thereof

A silicon brass and free-cutting technology, which is applied in the field of lead-free free-cutting silicon brass and its preparation, can solve the problems of high cost of silicon brass, unacceptable to users, and high copper content, so as to improve free-cutting performance and improve yellowness. Copper cutting performance, low cost effect

Inactive Publication Date: 2015-03-11
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main feature of Sanbao series products is that the copper content is very high, generally higher than 70%, so the cost of this type of silicon brass is higher than that of ordinary brass products, which is difficult to be accepted by users, thus limiting its popularization and application

Method used

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  • Lead-free free-cutting silicon brass alloy and preparation method thereof
  • Lead-free free-cutting silicon brass alloy and preparation method thereof
  • Lead-free free-cutting silicon brass alloy and preparation method thereof

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preparation example Construction

[0027] One, the preparation method of lead-free free-cutting silicon brass, its specific process is:

[0028] Step 1. Design the alloy composition ratio, that is, the components and contents in the alloy include: copper 62-68wt%, zinc 28-34wt%, silicon 2.2-3.5wt%, zinc sulfide 0.5-1.8wt%, and the balance is copper ;

[0029] Step 2. Preparation of prefabricated blocks: Fully mix copper powder, copper sulfide powder, and zinc powder in a ratio of 4:3:3 and press to form a prefabricated block. Mix the copper powder, copper sulfide powder, and zinc powder in proportion Mix evenly on the powder machine, and press the mixed powder into blocks on the hydraulic press.

[0030] Step 3. Smelting: First, add electrolytic copper to the smelting furnace and melt it with the furnace. Control the furnace temperature at 1040-1100°C, then add prefabricated blocks and silicon. After the prefabricated blocks are added, they will react in situ with the help of the high temperature of the copper...

Embodiment 1

[0049] After the alloy composition is designed according to Table 1 and the prefabricated block is prepared, the electrolytic copper is first added to the melting furnace and melted with the furnace. The furnace temperature is controlled at 1040°C, and then the prefabricated block and silicon are added. After the prefabricated block is added, it will be generated by the high temperature of the copper liquid. In-situ reaction, after the reaction is fully carried out, cool down to 450°C with the furnace, add pure zinc, stir well to make the ingredients uniform, keep warm for 5 minutes, cast the copper alloy liquid on the iron mold to obtain a silicon brass alloy ingot; The brass alloy ingot is heated to 700°C, the mold is preheated to 150°C, and the finished product is hot-extruded with an extrusion ratio of 9:1.

[0050] Table 1 is the brass alloy composition (wt%) of the present invention

[0051] alloy element

Embodiment 2

[0053] After the alloy composition is designed according to Table 2 and the prefabricated block is prepared, the electrolytic copper is first added to the melting furnace and melted with the furnace. The furnace temperature is controlled at 1050°C, and then the prefabricated block and silicon are added. After the prefabricated block is added, it will be generated by the high temperature of the copper liquid. In-situ reaction, after the reaction is fully carried out, cool down to 450°C with the furnace, add pure zinc, stir well to make the ingredients uniform, keep warm for 8 minutes, cast the copper alloy liquid on the iron mold to obtain a silicon brass alloy ingot; The brass alloy ingot is heated to 750°C, and the mold is preheated to 150°C, and the finished product is hot-extruded with an extrusion ratio of 9:1.

[0054] Table 2 is the brass alloy composition (wt%) of the present invention

[0055] alloy element

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Abstract

The invention discloses a lead-free free-cutting silicon brass alloy and a preparation method thereof. The silicon brass alloy comprises the following components and contents: 28-34wt% of zinc, 2.2-3.5wt% of silicon, 0.5-1.8wt% of zinc sulfide and the balance of copper. The lead-free free-cutting silicon brass alloy has the beneficial effects that the copper content in brass alloy is less than 70%, and the free-cutting performance of brass alloy is improved through adjusting the contents of zinc, silicon and zinc sulfide added in brass alloy; the obtained free-cutting brass alloy is low in cost; and zinc sulfide is introduced in silicon brass by using an in-situ synthesis technology and is brittle, so that the effect of improving the cutting performance of brass is achieved.

Description

technical field [0001] The invention relates to the field of free-cutting silicon brass alloys, in particular to a lead-free free-cutting silicon brass and a preparation method thereof. Background technique [0002] Because brass alloys are used in a wide range of fields, their cutting performance directly affects the yield, production cost and production efficiency of machined products. Existing free-cutting brasses mainly include leaded brasses, and lead-containing cast brass alloys are widely used in many fields due to their excellent cutting and casting properties and low production costs. However, with the development of industrialized society, the harm of lead to the ecological environment has become increasingly apparent, so developed countries have been committed to the research of free-cutting lead-free brass. Free-cutting lead-free brass is designed by improving the composition of brass. Adding a small amount of other non-toxic elements to replace lead, forming a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04C22C1/02
Inventor 万晓峰岑志剑
Owner NANTONG UNIVERSITY