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Heating method of hollow ingot

A heating method and hollow ingot technology, applied in the field of engineering applications, can solve problems such as inner surface oxidation, and achieve the effects of reducing extrusion defects, reducing inner surface oxidation problems, and low risk

Pending Publication Date: 2021-02-12
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the inner surface oxidation problem of the hollow ingot in the heating process in the prior art, and provides a method of heating the hollow ingot with graphite protection, which can increase the extrusion rate of the hollow ingot and improve economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Before heating:

[0020] Place the graphite rod in the hollow ingot; the stone mill rod is processed according to the length and inner diameter of the hollow ingot, the diameter of the stone mill rod is 8mm smaller than the inner diameter of the hollow ingot, and the length of the stone mill rod is the same as the length of the hollow ingot. Adjust the heating temperature (35°C higher than the extrusion temperature) and time to a suitable range. Place 8 hollow ingots with graphite rods in the copper ingot heating furnace. Before starting the furnace, place the hollow ingots with graphite rods at 150 mm from the exit end of the induction heating coil in the copper ingot heating furnace. Under the premise, it must not be advanced.

[0021] Heating process:

[0022] Observe continuously through the observation hole, pay special attention to the temperature of the billet during the heating process, and gradually increase the temperature to prevent local overheating and ma...

Embodiment 2

[0026] Before heating:

[0027] Place the graphite rod in the hollow ingot; the stone mill rod is processed according to the length and inner diameter of the hollow ingot, the diameter of the stone mill rod is 2mm smaller than the inner diameter of the hollow ingot, and the length of the stone mill rod is the same as the length of the hollow ingot. Adjust the heating temperature (55°C higher than the extrusion temperature) and time to an appropriate range. Place 4 hollow ingots with graphite rods in the copper ingot heating furnace. Before starting the furnace, place the hollow ingots with graphite rods at 250mm from the exit end of the induction heating coil in the copper ingot heating furnace. Under the premise, it must not be advanced.

[0028] Heating process:

[0029] Observe continuously through the observation hole, pay special attention to the temperature of the billet during the heating process, and gradually increase the temperature to prevent local overheating and...

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Abstract

The invention discloses a heating method of a hollow ingot. The heating method comprises the following steps that (1) a graphite rod is placed in the hollow ingot, wherein the length of the graphite rod is the same as that of the hollow ingot, and the diameter of the graphite rod is 2mm-8mm smaller than the inner diameter of the hollow ingot; (2) the hollow ingot with the graphite rod is placed ina copper ingot heating furnace to be heated; and (3) after the hollow ingot with the graphite rod reaches the process temperature, the hollow ingot is pushed out of the copper ingot heating furnace and conveyed to an extruder, and the hollow ingot is extruded after the graphite rod in the hollow ingot is taken out. The heating method of the hollow ingot effectively solves the problem of oxidationof the inner surface of the hollow ingot in the heating process, so that the pipe yield is greatly increased; the method is simple, convenient to operate, good in using effect and capable of reducingmetal loss; and according to the heating method of the hollow ingot, the one-time yield of pipes is greatly improved, and obvious economic benefits can be obtained.

Description

technical field [0001] The invention belongs to the technical field of engineering application, and in particular relates to a heating method for a hollow ingot. Background technique [0002] Before the ingot is extruded, it needs to enter the heating furnace for heating. During the heating process of the hollow ingot, the inner surface of the hollow ingot is usually severely oxidized, which affects the extrusion rate of the hollow ingot. For the popularization and application of hollow ingots, certain difficulties have been brought. Contents of the invention [0003] The invention aims at the oxidation problem of the inner surface of the hollow ingot in the heating process in the prior art, and provides a method for heating the hollow ingot with graphite protection, which can increase the extrusion rate of the hollow ingot and improve economic benefits. [0004] The present invention adopts following technical scheme: [0005] A method for heating a hollow ingot, chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C29/00
CPCB21C29/003
Inventor 王雪连凌得魁张戬李文兵孙武林杨俊辉陈振峰黄培根赵堂昌蔬晓莉张星星徐兴莉
Owner JINCHUAN GROUP LIMITED
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