ESTUDO DA EFICIÊNCIA DOS TRATAMENTOS SUPERFICIAIS DE NITRETAÇÃO E REVESTIMENTO EM PVD NA OPERAÇÃO DE REPUXO DO FLANGE DO BOTIJÃO P13

Abstract

This work is based on a study carried out in a Brazilian company in the metallurgical sector, which uses tempered and polished VC131 steel punches in the drawing process of the P13 flange. The efficiency of these punches was not meeting the need for production, becoming a serious problem, since the P13 cylinder is the second most commercialized product by the company. Initially it was observed that the punch did not show good resistance, as it was replaced or polished in short intervals, producing about 4000 pieces / punch. When a punch was polished more than twice, it was already less efficient and its replacement was necessary. The stoppage of the machine to replace the punch punched the production, causing damage to the company. In search of an increase in the performance of the punch, the company decided to search the market for solutions in surface treatments that would increase productivity and decrease the breakage and wear of the punches. Based on the characteristics of the process, material used and the company's needs, the treatment called Balinit Lumena Duplex was defined, which is the combination of PVD coating with low pressure nitriding. The coated punch has a slightly higher cost in making it, but it pays off in the number of pieces produced, which now stands at 100,000 per punch. This added to the decrease in set up and production stops brought to the company a very significant gain, which can be visualized in a simple account about the cost of the punch for the pieces produced by him.