1 Introduction

The concept of Tool-Management was first proposed by the United States in the 1980s and first applied to the "Saturn Project" of General Motors Corporation 15 years ago. However, the types of tools involved in tool management were relatively simple (non-precision). Tool), the content is also limited to logistics management. Through continuous improvement and improvement, tool management has now developed into a complete management model, and its application scope has gradually expanded. Some enterprises have applied tool management to participate in project support at the beginning of the new project. Since the 1990s, tool management has begun to be implemented in European companies such as Germany. At present, more and more enterprises (especially automobile manufacturers, such as the Opel factory in Hungary, the Volkswagen Poland factory in Germany, the Shanghai factory in the United States, etc.) have adopted the tool management mode.

In machining, the direct cost of the tool generally accounts for about 4% of the total processing cost (for example, if the tool life is increased by 30%, the total processing cost can be reduced by 1%). The indirect cost of the tool (including the cost of tool selection, inspection, storage, purchase, repair, grinding, management, etc.) is about 4 times the direct cost of the tool. Therefore, reducing the indirect cost of the tool is the most potential to reduce the cost of the tool. The most effective way. The introduction of the tool management system by the enterprise to optimize the management of the tools used can save the cost of storage, procurement, management, etc., optimize the processing technology, and achieve the purpose of improving product quality and reducing production costs.

2. Tool management content and operation mode

Tool management process and mode

The meaning of tool management is to optimize the tool supply in the production process, communicate the internal and external tool information and tool logistics management around the technology, quality and cost of the product. The tool management system mainly includes two modules of application and project. The main function of the application module is the technical consultation of the tool and the optimization of the production process. The scope of work covers tool selection and process improvement (such as cutting parameter optimization). The main function of the project module is to provide the machining plan for the entire part according to the product drawings and to configure the corresponding tool reasonably. The workflow of tool management is shown in Figure 1. According to the work of tool management, the tool management can be summarized into the three modes listed in Table 1.

Five levels of tool management

According to the difference of tool management content, tool management can be divided into different levels, some involve only tool storage management; some include tool grinding, adjustment and on-site tool supply; some require at least one technical engineer At the scene, directly serve the users. At present, foreign tools are generally divided into five stages (levels) as shown in Figure 2:

In the first and second phases, the main content of tool management is tool grinding and tool preparation, which can meet the basic needs of users.

In the third and fourth phases, the main tasks of tool management are process optimization, improvement and inventory management. From the third stage, the personal qualities of the tool management manager will affect the quality of customer service. The difference between the third, fourth and fifth phases is that the customer has to rely more on his own tool knowledge, and the tool management manager is just a qualified consultant. Most of the tool management currently applied can only reach the third and fourth levels.

The fifth stage (the highest level) includes the following contents in the first to fourth stages: the tool management manager is stationed at the production site; the special grinding machine is used at the manufacturing site to grind the tool; The tool magazine can directly measure and pre-adjust the tools at the production site, provide tool repair, grinding and coating services, and provide tools to the production line in time to ensure normal production. At this stage, the tool management manager is fully involved in the project to optimize tool configuration and application. The tool management manager needs to master the tool technology of the entire project, and the quality of its work directly affects the process optimization effect. The fifth stage of tool management costs is not based on the number of tools consumed, but on the number of workpieces produced, while setting clear requirements for the reduction in annual tool costs.

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