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High-frequency drawing casting method for tin phosphorus bronze

A tin-phosphorus bronze and high-frequency technology is applied in the field of high-frequency casting of tin-phosphorus copper alloys, which can solve the problems of coarse and uneven ingot structure, low production efficiency, short casting time, etc. The effect of reducing production costs and reducing billet cracking

Active Publication Date: 2012-10-10
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pull for 1 second, stop for 3 seconds, and most of the time is a pause process. CN1263876C records that the drawing and casting process of copper strips is a small lead and short pause, and the process is reversed appropriately in the middle. The drawing time is still short and the pause time is long. , the casting speed is slow and the production efficiency is low. Under this casting condition, the casting speed is slow and the production efficiency is low, and the ingot structure is relatively coarse and uneven, and there is component segregation. See Figure 5 shown

Method used

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  • High-frequency drawing casting method for tin phosphorus bronze
  • High-frequency drawing casting method for tin phosphorus bronze
  • High-frequency drawing casting method for tin phosphorus bronze

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] When drawing casting, first set the program on the control system of the haul-off machine according to the data in the table below, start drawing at a drawing speed of 90mm / min, and after drawing 100 times (period, the same below); Increase the speed to 120mm / min, draw casting 100 times; then increase the speed to 150mm / min, draw casting 100 times; finally increase the casting speed to 180mm / min, keep this casting speed for constant production, and cast during the casting process The temperature is maintained at 1950-1980°C, and the pressure of the cooling water is controlled between 0.55-0.65MPa. The metallographic diagram of the billet is as follows figure 2 shown.

[0015]

[0016]

Embodiment 2

[0018] When casting, first set the program on the control system of the haul-off machine according to the data in the table below, start pulling at a casting speed of 90mm / min, and increase the casting speed to 120mm / min after casting 90 times Draw casting 80 times, then increase the speed to 150mm / min, after drawing 80 times, increase the casting speed to 180mm / min, draw casting 80 times, finally increase the casting speed to 210mm / min, keep this The casting speed is stable, the casting temperature is kept at 1950-1980°C during the drawing casting process, and the pressure of the cooling water is controlled between 0.55-0.65MPa.

[0019]

Embodiment 3

[0021] When drawing casting, first set the program on the control system of the tractor according to the data in the table below, first start drawing casting at a casting speed of 90mm / min, after drawing 100 times, increase the casting speed to 120mm / min, After 80 times of casting, increase the speed to 150mm / min; 80 times. Finally, after raising the casting speed to 240mm / min, maintain the casting speed for stable production. During the casting process, the casting temperature is kept at 1950-1980°C, and the pressure of cooling water is controlled between 0.55-0.65MPa. The metallographic diagram of the billet is as follows image 3 shown.

[0022]

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Abstract

The invention provides a high-frequency drawing casting method for tin phosphorus bronze. Under the condition that drawing casting temperature is 1950-1980 DEG C and the pressure of drawing casting cooling water is 0.55-0.65MPa, the drawing casting method comprises the steps of forward drawing casting, a first pause, a first reverse pushing, a second pause, a second reverse pushing and a third pause, which forms the continuous process of a circular unit. The drawing casting speed is improved to 180-300mm / min and the drawing casting frequency is improved to 40-94 times / min. The faster drawing casting frequency is used, and the second pause, the second reverse pushing, the third pause and the third reverse pushing are added, so that the tin phosphorus alloy is in a vibration motion state all the time the crystallization process, thick dendritic crystals are easy to smashed, crystalline grains are refined, alloying elements are boosted to be evenly distributed, casting blank tissues are even, and inverse segregation degree is relieved, thereby effectively reducing occurrence of pull cracks of the casting blanks and incidence rate of rib flaws in the process of the follow-up processing, improving the rate of finished products, the drawing casting speed of the circular unit, capacity and production efficiency of equipment by a wide margin and reducing production cost.

Description

technical field [0001] The invention relates to a copper alloy drawing casting method, in particular to a high-frequency drawing casting method of a tin-phosphorus-copper alloy. Background technique [0002] Tin phosphor bronze has high elasticity, wear resistance and antimagnetism; it can be press processed in hot and cold states, and has good welding and brazing properties; good cutting performance; good corrosion resistance in the atmosphere and fresh water; castability Good, so its cold-worked thin strip has long been widely used in the radio, electronics, and communication industries to manufacture elastic parts with high conductivity, mainly for the manufacture of spring contact pieces and other springs with good electrical conductivity; in precision instruments Wear-resistant parts and anti-magnetic components, such as contact reed brush boxes, vibrating plates, etc. [0003] In the production of tin phosphor bronze, the low-frequency casting process has been adopted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/00
Inventor 戴姣燕王永如慕思国洪燮平代文刚温霄巢国辉贺挺王栋梁何林斌
Owner JINTIAN COPPER GROUP CORP NINGBO
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