03 / 03 发布时间: 2020
The development trend of electric spindle technology is mainly reflected in the following aspects:One. High speed, high stiffnessDue to the needs of high-speed cutting and practical applications, with the development of spindle bearings and their lubrication technology, precision machining technology, precision dynamic balancing technology, high-speed tools and their interface technology, the high-speed CNC spindles have become the current development. The general trend, such as electric spindle for drilling and milling, the speed of HF42 of Swiss IBAG reaches 140,000r/min, the D1733 of the PCB drilling electromechanical spindle of WestWind in the United Kingdom has reached 250,000r/min; the electric spindle of machining center, the highest of FISCHER in Switzerland The speed reached 42000r/min and the Italian CAMFIOR reached 75000r/min. In terms of the system stiffness of the electric spindle, due to the development of bearings and their lubrication technology, the system stiffness of the electric spindle is getting larger and larger, which meets the needs of high-speed, high-efficiency and precision machining development of CNC machine tools.Second, high speed and high power. Low speed and high torqueAccording to the needs of actual use, most CNC machine tools need to meet the requirements of heavy cutting and high-speed cutting during low-speed roughing. Therefore, the machine tool spindle should have low-speed, high-torque, high-speed and high-power performance. For example, the electric spindles of machining centers produced by manufacturers such as CAMFIOR of Italy, Step-Tec of Switzerland, and GMN of Germany, it is not difficult to output torque to 200Nm in low speed section. The maximum torque of CNC milling machine and lathe electric spindle of CYTEC in Germany is Up to 630 N·m; in the high-speed section, the power is generally 10 to 50 kW; the maximum output power of the CYTEC electric spindle is 50 kW; the maximum power of the Swiss Step-Tec electric spindle is 65 kW (S1) for aircraft manufacturing. And mold processing; more reports that the electric spindle power reaches 80kW.Third, further development towards high precision, high reliability and extended working lifeThe user puts higher and higher requirements on the precision and reliability of the CNC machine tool. As one of the core functional components of the CNC machine tool, the electric spindle requires higher precision and reliability. For example, the radial runout of the main shaft is within 0.001mm, and the axial positioning accuracy is less than or equal to 0.0005mm. At the same time, due to the use of special precision spindle bearings, advanced lubrication methods and special preload application methods, the life of the electric spindle has been extended accordingly, and its reliability is getting higher and higher. Step-Tec's electric spindle is also equipped with an acceleration sensor to reduce the vibration acceleration level of the bearing. In order to monitor and limit the vibration on the bearing, a vibration monitoring module is installed to extend the working life of the electric spindle.Fourth, the electric spindle has built-in motor performance and form diversificationIn order to meet the needs of practical applications, the performance of the electric spindle motor has been improved. For example, the ratio of constant torque high speed to constant power high speed (ie constant power speed regulation range) of the Swiss FISCHER spindle motor output has reached 1:14. In addition, the permanent magnet synchronous motor electric spindle has appeared. Compared with the asynchronous motor electric spindle of the same power, the outer diameter of the synchronous motor electric spindle is small, which is beneficial to increase the power density and realize small size and high power.FIVE. Development towards rapid start and stopIn order to shorten the auxiliary time and improve the efficiency, it is required that the start and stop times of the CNC machine tool spindle are as short as possible, so a high start and stop plus (minus) speed is required. At present, the acceleration and start-up acceleration of the foreign machine tool electric spindle can reach more than lg, and the full-speed start and stop time is within ls.SIX. Bearings and their preload application methods and diversification of lubrication methodsIn addition to conventional steel rolling bearings, ceramic ball hybrid bearings have been widely used in recent years. Lubrication methods include grease, oil mist, oil and gas, etc., especially oil and gas lubrication methods (also known as Oil-air). The characteristics of environmental protection and energy conservation have been widely promoted and applied. The preload application method of rolling bearings is developed in addition to rigid preload (also known as positioning preload) and elastic preload (also known as constant pressure preload). An intelligent preloading method is to apply a preload to the bearing by using a hydraulic cylinder, and the preload can be controlled according to the specific working conditions of the spindle speed and load, so that the bearing performance of the bearing is more excellent. In the non-contact type bearing-supported electric spindle, such as magnetic bearing, air bearing electric spindle (Swiss IBAG, etc.), liquid floating bearing electric spindle (Ingersoll, etc.), etc., there are already a series of commodity supply markets.Seven, the tool interface gradually tends to HSK, Capto tool holder technologyAfter the machine tool spindle is speeded up, due to the centrifugal force, the traditional CAT (7:24) shank structure can no longer meet the requirements of use, and it is necessary to adopt HSK (1:10) and other shank interface forms that meet the high speed requirements. HSK shanks feature outstanding static and dynamic coupling stiffness, high torque transfer capability, high tool repeatability and coupling reliability, making them ideal for high speed, high precision applications. Therefore, the HSK toolholder interface has been widely adopted for high-speed electric spindles (such as IBAG in Switzerland, CYTEC in Germany, CAMFIOR in Italy, etc.). In recent years, the Capto tool interface proposed by SANDVIK has also been applied in the machine tool industry. The basic principle is similar to the HSK interface, but the ability to transmit torque is slightly larger. The disadvantage is that the inner hole of the spindle shaft is difficult to process and the process is complicated. .Eight, multi-functional, intelligentIn terms of multi-function, there are angular stop precise positioning (quasi-stop), C-axis drive, tool-opening air blowing, hollow-pass coolant, shaft end gas seal, low-speed torque amplification, axial positioning precision compensation, tool change automatic Dynamic balance technology, etc. In terms of intelligence, it is mainly manifested in various safety protection and fault monitoring and diagnosis measures, such as tool change interlock protection, bearing temperature monitoring, motor overload and overheat protection, bearing unloading protection when loosening the knife, spindle vibration signal monitoring and fault abnormality. Diagnostics, automatic compensation of axial position change, signal monitoring and automatic control of grinding wheel dressing process, tool wear and damage signal monitoring, etc. For example, the Step-Tec electric spindle is equipped with a diagnostic module, and the maintenance personnel can read the data through the infrared interface to identify the overload. Calculate the working life of the electric spindle.
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08 / 24 发布时间: 2019
2008、2009年国际金融风暴开始席卷全球,世界工业领域大幅减产,实体经济陷入严重衰退,世界精密加工行业也将随之衰退。2010、2011年属于出口恢复性增长。2012年受欧洲债务危机影响,新一轮世界经济衰退期开始显现,我国电动机出口企业应在2015年后抓住机遇,摆脱低价恶性竞争,不断提高动力头产品质量,开拓国际新兴市场。  钻孔攻牙动力头行业要推进产能合作,避免低端恶性竞争。攻牙动力头行业在实施“走出去”战略、推进国际产能合作方面已经有发电、输变电龙头企业率先垂范,并取得了一定的成绩。因此,行业内凡具备一定条件的优势企业,都应当积极拓宽国际合作领域、扩大市场空间,提高国际化水平。  摆脱国内动力头无序竞争的根本在于避开市场的恶性低价竞争,走高端产品、特色产品之路。国内钻孔攻牙动力头行业应从根本上改变品种单调、精度较低局面,瞄准高端市场,重新定位,提高产品使用精度,使用寿命。在国外,欧盟国家电机制造业总体上以中小企业为主,其高技术含量电机的市场定位比较稳固,一方面他们积极生产高品质攻牙产品,;另一方面,他们再对同样的产品进行巧妙设计,使电气性能比我国同等功率的动力头产品要好很多,使用便捷性优势明显,西德克攻牙动力头产品逐步形成自己的特色,参与全球的市场中去。  钻孔攻牙动力头行业要加快在重点行业全面推进“智能制造”,专注细分的细牙攻牙,细孔钻攻领域,提升自身定位优势。面对产品价格持续走低、人工成本不断上升、利润降低、企业生存压力加大的情况,加之下游行业对于动力头技术性能和质量要求不断提高,  BINDE宾德精密钻孔攻牙动力头行业要智能驱动,借力“一带一路”。为进一步拓展国内精密钻孔攻牙动力头产品在国内的市场,已优质的产品特性,过硬的产品品质赢得客户信任,扎根细分高精密加工领域,踏实推进增加市场份额,逐步形成国产产品逐步替换进口方技动力头、速技能动力头,翰坤动力头等品牌。逐步改变钻孔攻牙动力头的市场国产占有率。
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