Machine tool spindle and bearing

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Machine tool spindle and bearing

Source: Bearing network time: 2013-03-08
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These years; the function of the machine tool spindle is further developed in the direction of high speed, high precision and high rigidity. In the satisfaction of these needs together; it must also be conducive to environmental protection and focus on global warming and other environmental problems.
The uniqueness of the depiction: Mr. Yu Yu: NSK's bearing depiction is based on conflict learning; the four intermediate skills (analytical skills, assessment skills, slick skills, and data skills) relying on conflicts. This is especially true for the description of machine tool spindle bearings. First; NSK announced its long-life, high-performance bearing data using its latest skills. Secondly, regarding the depiction of the rolling body; we developed ceramic materials with superior functions in all aspects of high-speed and ultra-high-speed environments; effectively Completed the ultra-high-speed, ultra-high-precision rotation required by the metal tumbler; won the praise of the vast users. Others; NSK developed a roll cage guided resin cage with a common layout shape; with smooth grease running-in Short time; stable temperature rise; low conflict and low noise; unique in carrying out better conditions under grease-smooth conditions; and on fine cylindrical roller bearings; more ultra-high-performance PPS and PEEK resin materials; Has superior speed and heat resistance.
Mr. Chen Shizhen: The radial runout of the spindle bearing, the runout of the end face, the inconsistent diameter of the roll body, etc. will seriously affect the accuracy of the spindle system and its machining parts; therefore, the bearing accuracy on the spindle of the fine machine tool should be P5 and above. For the spindle support of high-speed, high-precision machine tools such as CNC machine tools and machining intermediates, P4 and above superfine bearings are required.
The high-speed adaptability of the spindle bearings is also uniquely important; uniquely for the satisfaction of the continuous advancement of machining speed; the development and continuous improvement of high-speed spindles including electric spindles; the need for high-speed adaptability of spindle bearings is increasing. The high-speed adaptability of the bearing is not good; the temperature rise of the spindle system will be very serious;
Mr. Ye Jun: As the basic part of the key; the spindle bearing of the machine tool is the pillar stone guaranteed by the machine tool precision. It follows the modern machine tool to the direction of high precision, high speed and high reliability; it puts forward higher requirements for the spindle bearing. Or usually in machinery; the speed is mainly in the hundreds to thousands of revolutions per minute; and the modern high-speed machining machine; the spindle speed needs to reach tens of thousands to go to hundreds of thousands of revolutions per minute. In the bearing industry; use dmN value to indicate high-speed function It is the product of diameter and speed; the target of the machine tool spindle is usually less than 2 million; the highest is up to 4 million; the need is very high. Therefore, the bearing needs to be completely new; the angular touch ball bearing is taken as an example; The selection of data, the description of the layout, the guiding method, the smooth method description, the selection of the groove curvature coefficient, etc. all need to be analyzed and discussed in order to align the spindle.
Discussion on the data Mr. Ye Jun: Because of the high precision, high speed and high reliability of the spindle bearings of the machine tools; there are some special needs in the data; the ferrule data is mostly made of high quality refined steel; there are special special steels abroad. Copper, plastic, special self-smooth data. Rolling body with bearing steel, ceramic materials.
As a new material; the use of ceramic materials in rolling bearings has opened up a new world of bearing materials. The use of ceramic materials has broken through many of the limits of traditional steel bearings; such as high speed, wear resistance, insulation, temperature resistance. The commonly used silicon nitride ceramics only account for more than 1/3 of the steel; therefore, the stress level of the tumbling ring on the ferrule is greatly reduced at high speed; the bearing speed of the same scale is greatly promoted, and the hardness of the silicon nitride ceramic is 1500 HV. It is double the bearing steel; the high temperature resistance up to 1200 °C is 6 times that of the bearing steel; these undoubtedly expand the scope of use of traditional steel bearings. Therefore, it can be said that the use of ceramic materials is an innovation of the rolling bearing materials; ceramics The data bearing is the most promising new data bearing for the 21st century.
Mr. Chen Shizhen: Regarding the normal machine tool spindle; there is no special need for the information of the spindle bearing. However, with the high speed of the main axis of the CNC machine tool; the working speed of the spindle bearing needs to be higher and higher; the need for data is also increasing. High. Current; ceramic materials (primarily referred to as Si3N4 engineering ceramics) have become the ambition to produce high-speed fine bearings. Compared with bearing steels; ceramic materials have the following advantages: 1) low density. Can reduce the weight and speed of bearings. 2 High rigidity. Elastic deformation after stress. 喽 睾 睾 傻 招 招 招 撸 撸 撸 撸 撸 撸 撸 撸 撸 撸 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 The amount of change in the scale. Also Na is still 停 淮 淮 苊饬 苊饬 嗟 嗟 攘 攘 攘 奂 奂 奂 涫 涫 涫 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 Shepherd shrimp legs squatting love α.
Ceramic bearings have been used more and more widely; however, because of the difficult processing of ceramic materials; fine ceramic bearings are mostly ceramic ball bearings with inner rolling ring and bearing steel.
Mr. Yu Wei: With the high-speed development of the main axis of the CNC machine tool; the need for high-speed, high-rigidity, low-temperature rise and long life of the spindle bearing. The ceramic material (primarily referred to as Si3N4 engineering ceramic) has a small density and elastic mode. High capacity, small coefficient of thermal expansion, wear resistance, high temperature resistance, corrosion resistance and other excellent functions; then become the ambition of making high-speed fine bearings.
Specifically; compared with steel ball bearings; the primary ceramic component is 40% lighter than the steel ball; therefore, the centrifugal force acting on the rolling body. (4) 鹊 浯斡捎谙吲蛘 浯斡捎谙吲蛘 浯斡捎谙吲蛘 浯斡捎谙吲蛘 浯斡捎谙吲蛘 桓咚傩 桓咚傩 桓咚傩 桓咚傩 桓咚傩 桓咚傩 孀 孀壬 壬 鸬 鸬 鸬 そ袅 啾 啾 蚪 蚪 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( (
In addition to the ceramic tumbling body; NSK has long been devoted to longevity skills; it has announced long-life, high-performance spindle bearing data. They are: SHX materials used in ultra-high-speed reversal environment; high in high-load environment Reliability of EP steel; Z steel with long life in various normal environments.
Extremely high precision and speed of rotation Mr. Chen Shizhen: Aligning the spindle bearings is necessary to meet the high precision of guiding precision and speed; FAG's treatment plan is mainly reflected in the selection of new materials, product description optimization, ensuring and improving the quality of machining. Wait a few points.
After continuous theoretical analysis, experimentation, and the use of anti-happiness, 赜 嶂岢 嶂岢 嶂岢 ㄉ杓瞥鋈 ㄉ杓瞥鋈 TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX TX The smoothing agent's activity makes the FAG TX spindle bearing reduce the temperature rise by 10% during high-speed operation; together; this new bearing series can increase the speed by up to 10% under the same gap conditions.
In addition, the temperature field gradient is large in the electric spindle; the temperature of the two bearings is different; then the axial and radial bearing of each bearing is uneven during the operation; these uneven loads affect the stiffness and series placement of the bearing. The service life of the bearing set. FAG is the optional series of bearing sets for the electric spindle can greatly reduce these problems.
Mr. Ye Jun: Axis Research Technology can supply a complete set of processing solutions for the spindle bearings P4 to P2. In order to satisfy the high precision and high speed of the spindle bearings, the company developed high-speed plastic safety frame data, ceramic data roll, high-definition The bearing assembly skill and all-around matching skills; the company's developed precision machine tool spindle bearings won the national high-tech skills; "machine tool spindle bearing production skills and skills" won the provincial and ministerial level awards; "high-speed bearing plastic cage data research" won the country Level award.
Treatment of wear and heat problems Mr. Yu Yu: Specifically, NSK has developed high-performance steel with higher mechanical strength and long life, and ceramic tumbling body with high precision and high-speed function; it effectively handles wear and heat during bearing operation. The problem. In addition, we improve the layout and materials of the cage; make the cage have little effect on the deterioration of grease, smoother and more abundant, and better heat resistance.
Together; in order to effectively ensure the smooth condition of the bearing operation; and to minimize or even avoid the intrusion of dust; to deal with the problem of wear and heat; NSK continuously improved and depicted the bearing and smooth method; and first completed the oil and gas smooth The method has been gradually selected by a wide range of users; it has been widely recognized. These years; following the advent of the environmental protection era; NSK has announced the smooth grease replenishment system for high-speed spindles; intermittently replenishes trace smoothing to high-speed bearings. Grease; use the best shape of the spacer together to drain the used smooth grease into the storage tank provided in the bearing housing; in the world, the smooth grease smoothing in the high-speed category is completed for the first time; together, the long life is completed;
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