In the new context of globalization, large manufacturers are forced to improve their production processes and for this they need to design and apply tools to solve their problems. However, these practices are not evident in SMEs due to the lack of information on the benefits of their application. These companies play a crucial role in the country's economy since they represent more than 90% of the Peruvian market. Likewise, they have a very high rate of problems in the productive processes, which is also evident in the metal-mechanic sector. Therefore, this article proposes the design of an integration model of Lean tools and Knowledge Management, which is composed of 4 phases; in phase 0, the awareness and analysis of the current situation is carried out, in the first phase knowledge management is applied, in phase 2 the tools are implemented, finally in phase 3 the analysis and control of the results obtained. The model was validated in a metal-mechanic SME in Peru where an increase in production of 20% was obtained, as well as an improvement of 30% in the training and training of the person, and an improvement of 14% in overall efficiency equipment.