Our company is the production roll forming machine.
Large metal structures has long been the work of the surface treatment has been a problem in the automotive manufacturing mold, particularly in this issue. In order to solve this problem, many countries have engaged in a tireless effort. In recent decades, the international community has gradually accepted the formation of two more feasible method of treatment: electroplating and metal surface glow plasma nitriding. Through continuous improvement and development of these two technologies have been widely used.
First of all, to talk about this great glow plasma nitriding vitality and broad prospects for development of heat treatment technology in the automotive manufacturing industry in the application of mold. The development of ion nitriding can be traced back to the 30s last century, the mid-60s access to applications in industry, and to popularize and develop. It has the following characteristics:
For high hardness of the individual compounds, or high toughness of single compound or even non-compound layer can be through plasma nitriding atmosphere composition, pressure, flow and discharge parameters and temperature, time to get control. Brittle deformation because of its small-small, not often used directly after grinding.
Gas Nitriding than ordinary fast 1 / 2 ~ 1 / 3, particularly in the shallow layer of the circumstances. Such as: 38CrMoAl steel requirements layer 0.5mm, hardness HV900, the ion nitriding of 20 to 30 hours, gas nitriding for 40 ~ 50 hours.
Ion nitriding can be used not only with Cr, Al, V, Ti, Mo low carbon structural steel, hot die steel, high alloy tool steel, due to the high activity and atmosphere to the passivation effect, but also to deal with cast iron, stainless steel , heat-resistant steel, titanium, etc..
Ion nitriding pressure nitrogen gas is only about one percent of the general the following, which can save a lot of NH3 or N2-H2 gas. Ion nitriding process applies to wide temperature range (400 ~ 650 ) can be effectively reduced by processing parts of the thermal stress and the release of internal stress to prevent deformation of parts.
In addition, the development of vacuum technology and computer control technology is also effective to make up for the plasma nitriding of metal components used in large-scale arising from dealing with non-uniform temperature into the effect of non-uniform, it is difficult to precise temperature control, and other issues arc injury. At present, the largest ion nitriding equipment reached 3m 4m, automotive mold Co., Ltd. in Tianjin, it can be nearly 2.5m 4m weight of 10 tons or about 20 square meters surface area, or parts of the mold to ion nitriding processing, the basic cover all the cars and mini-car the size of mold, and the realization of the microcomputer automatic control, the furnace temperature can be maintained at less than 15 , processing capacity is the first in Asia.
As we all know, auto cover, especially with Die Mold Drawing on the work surface mold part of the strength, smoothness, hardness, wear resistance, etc. is very high.