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Lead-free free-cutting tin-phosphor bronze alloy and preparation method thereof

A tin-phosphorus bronze and easy-cutting technology, which is applied in the field of lead-free free-cutting tin-phosphorus bronze alloy and its preparation, can solve the problems that cannot meet the processing requirements of automatic lathes, poor machinability, etc., achieve plastic balance, improve cutting performance, and cutting performance balanced effect

Active Publication Date: 2022-05-06
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, Pb is an element harmful to the environment and human body. With the attention of human beings to health, lead-free materials are a trend, but the bronze rod does not contain Pb, and its machinability is very poor, which cannot meet the requirements of automatic lathes. Processing requirements

Method used

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  • Lead-free free-cutting tin-phosphor bronze alloy and preparation method thereof
  • Lead-free free-cutting tin-phosphor bronze alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Lead-free free-cutting tin-phosphorus bronze alloy with a specification of φ4mm, the specific preparation steps are as follows:

[0024] 1) Melting: mix ingredients according to the required ingredients in Table 1, and then smelt in a power frequency conjoined furnace. The melting temperature is 1120-1160°C. Slag removal agent removes slag and adds charcoal to cover and keep warm.

[0025] 2) Horizontal continuous casting: copper water is drawn horizontally from the crystallizer installed at the heat preservation end of the conjoined furnace. ℃, the traction process adopts the traction action of "pull-stop-pull", and the traction speed is 550r / min.

[0026] 3) Homogenization treatment: homogenization treatment temperature: 580°C, homogenization treatment time: 7h.

[0027] 4) Intermediate stretching and intermediate annealing: the homogenized φ14mm cast slab is stretched to φ9mm through 3 passes, the intermediate annealing temperature is 500°C, the heating time is 60m...

Embodiment 2

[0032]Lead-free free-cutting tin phosphor bronze alloy with a specification of φ4.8mm, the specific preparation steps are as follows:

[0033] 1) Melting: Do ingredients according to the required ingredients in Table 1, and then melt in a power frequency conjoined furnace. The melting temperature is 1100-1150°C. Slag removal agent removes slag and adds charcoal to cover and keep warm.

[0034] 2) Horizontal continuous casting: copper water is drawn horizontally from the crystallizer installed at the heat preservation end of the conjoined furnace. ℃, the traction process adopts the traction action of "pull-stop-pull", and the traction speed is 550r / min.

[0035] 3) Homogenization treatment: homogenization treatment temperature: 540°C, homogenization treatment time: 11h.

[0036] 4) Intermediate stretching and intermediate annealing: the homogenized φ14mm billet is stretched to φ10mm in one pass, the intermediate annealing temperature is 520°C, the heating time is 60min, and t...

Embodiment 3

[0041] Lead-free free-cutting tin phosphor bronze alloy with a specification of φ3.0mm, the specific preparation steps are as follows:

[0042] 1) Melting: mix ingredients according to the required ingredients in Table 1, and then smelt in a power frequency conjoined furnace. The melting temperature is 1130-1160°C. Slag removal agent removes slag and adds charcoal to cover and keep warm.

[0043] 2) Horizontal continuous casting: copper water is drawn horizontally from the crystallizer installed at the heat preservation end of the conjoined furnace. ℃, the traction process adopts the traction action of "pull-stop-pull", and the traction speed is 400r / min.

[0044] 3) Homogenization treatment: homogenization treatment temperature: 630°C, homogenization treatment time: 4h.

[0045] 4) Intermediate stretching and intermediate annealing: the homogenized φ12mm casting slab is stretched to φ8.5mm after 3 passes, the intermediate annealing temperature is 520°C, the heating time is ...

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Abstract

The invention discloses a lead-free free-cutting tin-phosphor bronze alloy, which is characterized in that the tin-phosphor bronze alloy comprises the following components in percentage by mass: 4.0 to 7.0 weight percent of Sn, 0.01 to 0.50 weight percent of P, 0.03 to 0.50 weight percent of S, 0.02 to 0.1 weight percent of V, less than or equal to 0.01 weight percent of Pb, and the balance of Cu and inevitable impurities. According to the lead-free free-cutting tin-phosphor bronze alloy, the S element is added on the basis of 6.5-0.1 of QSn, the lead-free free-cutting tin-phosphor bronze alloy does not contain the Pb element harmful to the human body and does not contain the Bi element (the regeneration performance of the Bi-containing copper alloy waste is poor), Cu2S and SnS2 are formed by adding the S element, the cutting performance of the material is improved, and finally the lead-free free-cutting tin-phosphor bronze alloy with balanced conductivity, cutting performance and plasticity is achieved. And the requirement of automatic lathe fast-cutting machining is met.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a lead-free free-cutting tin-phosphorus bronze alloy and a preparation method thereof. Background technique [0002] Tin phosphor bronze is a good elastic material, mainly used to make various elastic components and communication connectors. The most widely used alloy grade is QSn6.5-0.1, and the American standard is C5191. It is used as a bar for processing Terminal connectors are usually cut on an automatic lathe, and the material needs to have good cutting performance, so tin-lead bronze QSn4-4-4 appeared in the market, and QSn4-4-4 is added with a certain amount of Pb element , Pb is insoluble in Cu, and is distributed in the grain and grain boundary in the form of simple substance, which destroys the continuity of the copper matrix and plays a role in breaking chips during cutting. As we all know, Pb is an element harmful to the environment and human body....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22F1/08B22D11/045
CPCC22C9/02C22F1/08B22D11/004B22D11/045
Inventor 叶东皇傅杰项燕龙
Owner JINTIAN COPPER GROUP CORP NINGBO