Copper-plating-free air-gouging carbon bar and process method thereof

Abstract

Disclosed is a technology method of a copper-plating-free air-gauging carbon bar. The copper-plating-free air-gauging carbon bar is made of materials including, by weight, 40-45% of asphalt coke, 20-25% of artificial graphite powder, 5-6% of an antioxidant additive and 28-30% of asphalt. The technology method includes: 1), mixing and kneading the above materials prior to feeding the same into an extruder and extruding into a bar material with a center hole, wherein the diameter of the bar material ranges from 8mm to 18mm, the diameter of the center hole ranges from 2mm to 6mm, and one bar is extruded in 1 / 2 seconds; 2), feeding the bar into a roasting furnace and roasting the same at the temperature ranging from 1200DEG C to 1300DEG C for 7 to 8 days; 3), turning off electricity of the roasting furnace, subjecting the bar to heat preservation for 6 to 7 days; opening the roasting furnace for natural cooling for 5 to 7 days, wherein the proportion of the bar material is from 1.56 to 1.62; 4), machining the formed bar material into the bar with a cone-shaped head of 1:50 in taper and an end face of the tail to be a 45-degree*1.5 chamfer. By the process method, the defect due to plated electrolytic copper on the surface in the prior art is completely overcome, pollution to the environment and injury to human body during production and usage can be effectively avoided, and the environment is protected; production cost can be effectively lowered, and production efficiency can be improved.

Description

technical field [0001] The non-copper-coated gouging carbon rod of the invention is mainly used for cutting steel plates, and the invention particularly relates to the improvement of the non-copper-coated gouging carbon rod and its process method. Background technique [0002] The existing process for preparing gouged carbon rods is: 45% pitch coke, 30% artificial graphite powder, and 35% pitch, all in weight ratio; knead the above materials, extrude them into rods, and extrude them in 1 / 3 second One, that is, extrude three rods per second, calculated as each rod is 300 mm long; roasting at a temperature of 1200-1300 ° C, the specific gravity of the rod after molding is 1.42-1.5. Due to the fast extrusion speed of this kind of rod, the density will be low, resulting in many pores, and the air will be stored in the pores after entering, and the product will be easily oxidized; because the rod is a solid structure, its flexural strength is relatively poor. In order to solve t...

AI Technical Summary

Problems solved by technology

Due to the increase of the copper plating process, it has caused serious pollution to the surrounding environment during the production process and the use of the product; because the product will produce a large amount of harmful substances and harmful smoke during the cutting process of the steel plate, it will also cause serious pollution to the surrounding environment. human body caused harm

[0003] Since the carbon rod is a cylindrical structure, the two ends of the head and tail are flat. When in use, the contact area of ​​the head end is large. When cutting the steel plate, it will affect the speed of the arc temperature rise, weaken the cutting ability, and the quality of the cut piece is not good. Stable; the end face of the tail is easy to cut the hands

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