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High-frequency copper tube pulling-casting process

A copper tube and high-frequency technology, applied in the high-frequency drawing and casting process of copper tube processing, can solve the problems of unstable tensile strength of products, short life of graphite molds, and high unit power consumption of products, and achieve uniform and stable mechanical properties. , improve the service life, the effect of reducing energy consumption

Active Publication Date: 2012-05-09
NINGBO JINTIAN COPPER TUBE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the copper tube is produced by the casting and rolling method, the copper tube blank is produced by the drawing casting process. The commonly used tube blank drawing casting process generally adopts the "pull-stop" process. The pulling frequency of the drawing casting machine is usually between 40-50HZ. The casting speed is low, resulting in high power consumption per unit of product, short graphite mold life, uneven billet structure, and defects such as porosity and looseness, resulting in many sawtooth damage to the finished product after rolling and coiling, and unstable product tensile strength. low rate

Method used

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  • High-frequency copper tube pulling-casting process
  • High-frequency copper tube pulling-casting process
  • High-frequency copper tube pulling-casting process

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: pull forward, speed 26.39mm / S, process 6mm—stop for 0.25 seconds—push backward, speed 22.99mm / S, retreat 0.89mm—stop for 0.3 seconds—and then move backward Push, speed 13.32mm / S, retreat 0.43mm—stop for 0.01 second, one process unit ends, and the cycle of the next process unit starts. The casting temperature is 1160°C, the mold cooling water pressure is 0.7MPa, and the cooling water flow rate is 22m 3 / h. The casting speed reaches 327mm / min.

Embodiment 2

[0012] Example 2: pull forward, speed 26.39mm / S, process 6mm—stop for 0.2 seconds—push backward, speed 22.99mm / S, retreat 0.89mm—stop for 0.3 seconds—and then move backward Push, speed 13.32mm / S, retreat 0.39mm—stop for 0.01 second, one process unit ends, and the cycle of the next process unit starts. The casting temperature is 1155°C, the mold cooling water pressure is 0.7MPa, and the cooling water flow rate is 25m 3 / h. The casting speed reaches 351mm / min.

Embodiment 3

[0013] Example 3: pull forward, speed 26.39mm / S, process 5.67mm—stop for 0.1 seconds—push backward, speed 22.99mm / S, retreat 0.89mm—stop for 0.3 seconds—go back Push back, speed 13.32mm / S, retreat 0.39mm—stop for 0.02 seconds, one process unit ends, and the cycle of the next process unit starts. The casting temperature is 1150°C, the mold cooling water pressure is 0.8MPa, and the cooling water flow rate is 26m 3 / h. The casting speed reaches 375mm / min.

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Abstract

The invention discloses a high-frequency copper tube pulling-casting process. When copper tube blanks are pulled-cast under the traction of a tractor, the pulling-casting temperature is controlled to be 1,150 to 1,160 DEG C, the cooling water temperature of a crystallizer is controlled to be 0.7 to 0.9 MPa, a cooling water flow is controlled to be 22 to 28 m<3> / h, and a continuous cycle process, of which a process unit comprises forward pulling, stopping, backward pushing, stopping, backward pushing and stopping, is adopted. In the forward-pulling casting process, the backward-pushing processis added, so that the texture of the tube blanks is compact and the metallographical phase of the tube blanks is uniform. Therefore, the mechanical performance, such as tensile strength and the like,of the finished products is uniform and stable; the shortcomings, such as air vents, loosening and the like, of the tube blanks are reduced; sawtooth damages, caused by the small air vents, in the finished products obtained by rolling and jiggering are reduced; the quality and yield of the finished products are improved; the traction speed in the pulling-casting process is high and can maximally reach 466mm / min; and compared with the conventional continuous process, the process improves the continuous casting speed by 1 to 5 times and reduces the energy consumption of specific yield by 7 to 9percent; and different pulling-casting speeds can be configured according to the degree of wear of a graphite die in the crystallizer, so the service life of the crystallizer is prolonged and the production cost is saved.

Description

technical field [0001] The invention relates to a high-frequency drawing-casting process, in particular to a high-frequency drawing-casting process for processing copper pipes. Background technique [0002] When the copper tube is produced by the casting and rolling method, the copper tube blank is produced by the drawing casting process. The commonly used tube blank drawing casting process generally adopts the "pull-stop" process. The pulling frequency of the drawing casting machine is usually between 40-50HZ. The casting speed is low, resulting in high power consumption per unit of product, short graphite mold life, uneven billet structure, and defects such as porosity and looseness, resulting in many sawtooth damage to the finished product after rolling and coiling, and unstable product tensile strength. low rate. Therefore, the traditional copper tube billet drawing casting process needs to be further improved. Contents of the invention [0003] The present invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/045B22D11/16
Inventor 黄绍辉梁刚赵惠芬郑冰芳冯卫徐培江陈国其
Owner NINGBO JINTIAN COPPER TUBE
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