(5) The trend of socialization and specialization is the only way for machine tool overhaul and numerical control transformation industry. The numerical control transformation and renovation of old machine tools is not only a necessary and important behavior in the current economic transition period, but also a strategic measure for the long-term development of enterprises.
At present, in the era of knowledge economy in the 21st century, most enterprises in China are facing enterprise restructuring, transition to enter the market economy, and rapid integration into international competition. This requires the leadership of our company to concentrate on all these forces to face these challenges. A new series of technical theories such as enterprise grouping and decentralized network, autonomy, parallel work, new organization, production structure, agile manufacturing technology, virtual manufacturing technology, sustainable manufacturing technology, green manufacturing technology, etc. Great strength to research, to develop marketable products, improve the ability to respond quickly to the market; concentrate human, financial, and material resources to enhance the market competitiveness of the company, give full play to its own advantages and create as much as possible at the fastest speed value. Therefore, it is impossible for the company itself to have a large and comprehensive maintenance team like the planned economy in the past. The socialization and specialization of equipment maintenance and transformation will inevitably become a major trend.
The transformation and refurbishment of foreign machine tools is an emerging industry that has recently developed, and has formed a certain scale and market in advanced countries. In China, this industry has only just emerged, and it is still far from being measured according to the conditions that should be met. However, people of insight in the industry are striving to shape themselves and improve themselves. I believe that in the near future, a group of specialized enterprises that have certain conditions and a certain scale of machine tool transformation and renovation will grow up.
Second, the choice of large modification plan
If this work can compete for the technical support of the modified enterprise, it may be better and faster.
1. Pre-project preparation work (1) The technical feasibility analysis is mainly aimed at the transformation target and the processing object, and comprehensively analyzes the technical status of the modified machine tool in terms of structure, performance and precision. Including whether the original structural design of the machine tool is reasonable; whether the basic components and structural parts of the machine tool are still intact; the ordinary machine tool is changed to a CNC machine tool, and it is necessary to examine whether the mechanical transmission structure of each coordinate axis and the form of the guide rail pair are applicable; The accuracy is compared with the factory precision, whether there is a gap; comprehensively summarize all the faults of the current machine tool and major faults that have occurred in history. In response to the above problems, the transformation task book is prepared according to the transformation target and the typical workpiece, so that the modified machine tool achieves certain advancement and practicability.
(2) Economic Feasibility Analysis Lists several situations that should be considered from the perspective of actual operability: from the value of the machine tool itself, whether the investment required to achieve the transformation target is too high; from the machine tool manufacturing in this unit The status and importance of the analysis of the value of the transformation; from the input and output rate of the machine tool, whether it can recover the investment faster, and then quickly produce better benefits; after the machine tool transformation, improve the accuracy of the machine tool, increase the function, whether it can enable An increase in the level of a unit product can be beneficial to the development of new products, thereby obtaining additional benefits. The source of funds for reconstruction is reliable.
(3) Choosing a machine tool changer This is a very critical issue. If you choose well, you can successfully complete the transformation task and achieve the transformation goal. If the choice is not good, it is not only the failure of the machine tool transformation, but also the waste of funds and time, affecting production. Users can choose carefully according to the conditions that the machine tool transformation should be discussed later.
2. Technical solution preparation (1) Mechanical and hydraulic system As the end user of the machine tool, the factory must first confirm the condition of the machine tool and hydraulic system. Such as: the current precision of the machine tool, the condition of the mechanical transmission chain, the condition of the lead screw and the guide rail, whether there are major faults, etc., to determine that the machine tool is overhauled and repaired. If it is a non-CNC machine tool to be changed to a CNC machine tool, first consider the feasibility of mechanical modification, the most important is the form of the rail and the installation of the ball screw. Then there is the transmission gap and transmission stiffness of the mechanical transmission mechanism in line with the requirements of CNC machine tools.
(2) Electrical system When making a CNC machine tool transformation plan, the user can select the CNC system according to the state of the machine tool and the process requirements. The first is to choose CNC manufacturers. At present, the world's performance and reputation are better: Siemens (Germany), Fanuc (Japan), Mitsubishi (Japan), NUM (France), FAGOR (Spain). On the basis of a detailed understanding of the characteristics of the above-mentioned manufacturers' numerical control system and the performance-price ratio, the user can select a suitable CNC system together with the engineering company that implements the transformation. Second, the type of the corresponding control system is selected according to the functional requirements of the machine tool, so that it can meet all the functional requirements of the machine tool without raising the standard.
We suggest that in the selection of CNC systems, special attention should be paid: First, try to move closer to the model series of a famous manufacturer. This is beneficial to both maintenance and management, as well as the purchase of spare parts. Never make the company's CNC system into a million-nation card. Second, we must clearly understand the status of maintenance services of selected manufacturers in China, so as to avoid future problems.
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