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A manufacturing method of shelling hammer for aluminum electrolytic cell

A manufacturing method and technology for shelling hammer heads, which are applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of lower price ratio of hammer heads, low bonding strength, and falling off of hammer heads, so as to reduce cracks in the surfacing layer and reduce the resistance of the surfacing layer. Good corrosion and wear resistance, the effect of slowing down the cooling rate

Inactive Publication Date: 2015-12-02
QINGTONGXIA ALUMINUM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The end of the hammer head of the above two patents is welded with the shelling rod in a flat surface. Because the hammer head is heavy and the bonding strength is low, it is easy to cause the hammer head to fall off.
Generally speaking, although the hammer head materials of the above-mentioned patents are all heat-resistant, corrosion-resistant and wear-resistant metal materials selected with reference to national standards, they are not completely suitable for the complex and harsh aluminum electrolysis environment; the carbon content of high-chromium alloy steel is about 0.3 %, the smelting process is complicated, and it is easy to produce casting defects, which affects the life of the hammer head and reduces the price ratio of the hammer head
It should be pointed out that, on the one hand, the shelling hammers produced by these technologies are all or partly made of heat-resistant steel, high-chromium cast steel, and high-chromium cast iron, which are expensive; on the other hand, these hammerhead materials contain The few alloying elements in the hammer head ensure the corrosion resistance of the hammer head, but the hardness and wear resistance of the hammer head are not good, resulting in a small increase in the life of the hammer head

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Process the forging process into a Q235 steel hammer base of φ95mm*300mm for pretreatment. First, use mechanical grinding to remove the oil stains on the surface of the workpiece during rolling, cutting, stamping, polishing, etc., and clean the surface of the base. Rust, scale and other dirt that are not conducive to surfacing treatment to obtain a clean surface. Then fully preheat, the preheating temperature is 600-700°C, and the preheating time is about 1 hour to ensure that the inside and outside are thoroughly heated. Large-scale gantry-type CNC plasma surfacing machine is adopted.

[0020] The weight ratio of each component of the iron-based self-fluxing alloy is (Wt%): C1.8, Cr18, Ni6.0, Mo1.0, Mn1.0, Si2.5, and the rest of Fe. The plasma powder surfacing process is adopted, and the fusion interface is formed between the base material and the surfacing material, and the bonding strength is high; the thickness of the surfacing layer is about 2~3mm, t...

Embodiment 2

[0022] Embodiment 2: The forging process is processed into a Q235 steel hammer base of φ95mm*300mm for pretreatment. First, the oil stains produced on the surface of the workpiece during rolling, cutting, stamping, polishing, etc. should be removed by mechanical grinding, and the surface of the base should be cleaned. Rust, scale and other dirt that are not conducive to surfacing treatment to obtain a clean surface. Then fully preheat, the preheating temperature is 600-700°C, and the preheating time is about 1 hour to ensure that the inside and outside are thoroughly heated. The test uses a large-scale gantry-type CNC plasma surfacing machine.

[0023] The weight ratio of each component of the iron-based self-fluxing alloy is (Wt%): C1.8, Cr12, Ni1.0, Mo0.5, Mn1.0, Si1.0, WC20, Fe balance. Plasma powder surfacing process is adopted to form a fusion interface between the base material and the surfacing material, and the bonding strength is high; the thickness of the surfacing ...

Embodiment 3

[0025] Example 3: Process the forging process into a Q235 steel hammer base of φ95mm*300mm for pretreatment, first use mechanical grinding to remove the oil stains on the surface of the workpiece during rolling, cutting, stamping, polishing, etc., and clean the surface of the base Rust, scale and other dirt that are not conducive to surfacing treatment to obtain a clean surface. Then fully preheat, the preheating temperature is 600-700°C, and the preheating time is about 1 hour to ensure that the inside and outside are thoroughly heated. The test uses a large-scale gantry-type CNC plasma surfacing machine.

[0026] The weight ratio of each component of the iron-based self-fluxing alloy is (Wt%): C2.2, Cr15, Ni0.5, Mo0.5, Mn1.0, Si1.0, WC30, steel bonded carbide powder content 5 %, Fe balance. Plasma powder surfacing process is adopted to form a fusion interface between the base material and the surfacing material, and the bonding strength is high; the thickness of the surfac...

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PUM

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Abstract

The invention relates to a manufacturing method of a breaking hammer head, and in particular relates to a manufacturing method of a breaking hammer head for an aluminum electrolysis cell. The method comprises the following steps of: processing a Q235 steel hammer head base body with a certain size through a forging process; carrying out surface pretreatment on the Q235 steel hammer head base body, such as cleaning and preheating; firmly fixing workpieces on a rotation table through bolts and nuts; preparing plasma surfacing powder according to proportionality range of all ingredients; carrying out a plasma powder surfacing process, and carrying out stress relief annealing after welding so as to eliminate welding stress and prevent the workpieces from suffering from a plastic deformation and a welding layer from suffering from crazing. The breaking hammer head is produced after heat preservation is carried out at 600-700 DEG C for 1.5 hours, an aluminium silicate fiber board is used for covering to perform slow cooling; and the manufacturing method is unique, high temperature resistant, abrasion resistant, corrosion resistance, long in service life and low in cost.

Description

technical field [0001] The invention relates to a manufacturing method of a shelling hammer, in particular to a manufacturing method of a shelling hammer for an aluminum electrolytic cell. Background technique [0002] Modern large-scale aluminum electrolytic cells all adopt computer-controlled shelling systems, so that the shelling hammer can periodically open the shells of the electrolytic cell to add electrolytic raw materials, which is of great significance to the smooth progress of the aluminum electrolysis process. As an important part of the prebaked anode aluminum electrolytic cell blanking system, the shelling hammer works for a long time in the harsh environment of strong magnetic field, high temperature and strong current, and is corroded by high temperature cryolite-alumina electrolyte molten salt and aluminum liquid and The impact wear and abrasive wear of the hard electrolyte crust cause the material of the hammerhead to lose continuously, and the size is conti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/14C23C24/10C21D1/30C21D9/00C23F17/00
Inventor 孙少波吴建宁谢宏李春林邓绍海张国栋曹红美
Owner QINGTONGXIA ALUMINUM GRP