Process for heating titanium oblique perforating rod ingot

Abstract

Process for heating titanium-oblique rolling punch rod blank adopts horizontal step-by-step medium-frequency induction heating finance as tool. The heating furnace consists of automatic skip mechanism, core-watch temperature differential monitoring system and fast-extraction discharge mechanism. The process is carried out by hoisting titanium rod onto bedding rack by overhead traveling crane, arranging on movable bedding rack paralleled, lifting titanium-rod onto charge rack on slop by production beat, entering into horizontal step-by-step medium-frequency induction heating furnace successively, moving titanium-rod forwardly by step-by-step mode, raising temperature while homogeneous heating, discharging, entering into blow tank of oblique-rolling punch, nipping and punching to raw pipe. It's simple, safe and cheap and has no environmental pollution.

Description

technical field [0001] The invention relates to a heating method in the processing process of a metal pipe, in particular to a heating process for a titanium cross-rolled perforated bar blank. Background technique [0002] In the process of manufacturing titanium and titanium alloy seamless pipes, titanium rods must first be processed into titanium tube blanks or titanium "barren tubes". One of the techniques for making "barren pipe" is cross-rolling and piercing. The method is to heat a solid titanium rod about 1 meter long to a high temperature state, that is, between 900°C and 1050°C, and then send it to a two-roll or three-roll cross-rolling piercer for rolling. Next, after 20 to 30 seconds, the solid titanium rod is processed into a titanium tube billet, that is, a titanium waste tube. In industrial production, an inclined-bottom gas furnace or an inclined-bottom resistance furnace is usually used to heat solid titanium rods. Due to the low operating cost of gas furn...

AI Technical Summary

Problems solved by technology

The titanium rod heats up slowly in the high-temperature inclined-bottom furnace. At high temperature, the interaction time between titanium and the atmosphere in the furnace is long (more than 1 hour), and the oxide layer and gas-absorbing layer on the surface of the tube blank are thick, which is not conducive to subsequent processing.

[0006] 2. The inclined bottom gas furnace is bulky and cannot be compactly configured with the inclined rolling piercing machine

Titanium has a small heat capacity and fast cooling. After the titanium billet comes out of the furnace, there is a large and unstable temperature drop on the roller table. The temperature of the pierced billet is unstable, which is not conducive to piercing.

[0007] 3. The gas furnace pollutes the environment and makes a lot of noise. Workers have to constantly turn materials at high temperature. The working environment is poor and the labor intensity is high.

[0008] 4. Each furnace needs to be filled with a lot of materials, and the heating time is long during intermittent operation, which is not suitable for small batch production

[0009] 5. The heat loss of the gas furnace is large, and the energy consumption per unit product is high

[0010] 6. Many operators (at least 4 people)

However, due to the skin effect of the induction current, the ordinary induction heating furnace makes the heating of the billet uneven, and there is a large temperature difference between the core and the surface, which cannot meet the heating requirements of the cross-rolled perforated billet.

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