What is the heat treatment process of the mold?

As far as we know, according to the technical introduction, TD coating treatment is short for thermal diffusion carbide coating process. Because this technology was first developed and patented by Toyota Central Research Institute in Japan, it is also called Toyota diffusion process, or TD process for short. Our country is also called molten salt infiltration. No matter what its name is, its principle is to put the workpiece in a molten borax mixture and form a metal carbide coating on the surface of the workpiece through high temperature diffusion. The carbide coating may be a carbide of vanadium, niobium, chromium, tantalum, titanium, etc. Or its composite carbide, of which vanadium carbide coating is the most widely used. A large number of practices have proved that TD coating treatment of vanadium carbide coating is one of the most economical and effective methods to solve the strain problem at present, which can prolong the service life of molds or parts by several times to dozens of times and has great use value. Scope of application: TD coating treatment 1 applicable materials and scope of application. Applicable materials: As long as the material of the workpiece contains a certain amount of carbon, such as various steel materials and cemented carbide with carbon content greater than 0.3%, VC coating can be formed on the surface of the workpiece. However, according to the different use conditions, in order to obtain good use effect, the choice of materials is quite particular. Generally, high chromium cold-working die steel is recommended for drawing, flanging, bending and rolling dies, such as SKD 1 1 in Japan and DC53 D2 in the United States. XW-42 is from Sweden; Domestic Cr 12MoV, Cr 12Mo 1V 1. For special working conditions, other materials may need to be selected.

In the classic case, the high-strength steel plate and thick plate of automobile stamping die have serious strain without surface treatment, and some of them can't even be produced normally. After TD coating treatment, on the one hand, the problem of surface strain of the workpiece is fundamentally solved, and it is not necessary to stop and grind the mold frequently, which improves the production efficiency and the appearance of the product. On the other hand, the service life of the die can generally reach several hundred thousand, which can maintain the consistency of stamping parts and improve product quality. The main benefit, the main benefit of TD coating treatment is 1. As far as the molding die is concerned, because the problem of strain on the surface of the die is solved, its advantages are: there is no need to stop frequently to repair the die in production, which greatly improves the production efficiency and improves the appearance of the product; 2. Because the service life of the die is greatly prolonged, the size uniformity of the processed product is improved and the product quality is improved; 3. As the service life of dies or workpieces is greatly prolonged, the production cost or operation cost is saved. Matters needing attention in application, TD coating treatment temperature is 850℃- 1050℃, which belongs to high temperature treatment process, and thermal stress will inevitably occur during the treatment process; For iron and steel materials, there is generally a phase transformation process during heating and cooling, and the result of phase transformation will form the change of phase transformation stress and specific volume of the workpiece. The changes of thermal stress, phase transformation stress and specific volume will cause deformation and even cracking of the workpiece. However, TD coating treatment is the final processing procedure of the mold, and no further processing is allowed after treatment, so the key to the successful application of TD coating treatment technology is: first, to form qualified surface coating; Second: minimize the deformation of the workpiece and prevent cracking.