When installing bearings, bolts are an important link. Here are some instructions on how to handle bolts provided by Luoyang East Axis:
The quality of fasteners, tightening method, the hardness of the lower surface of bolt head and the use of thread lubricant are all factors that can be controlled by manufacturers of bearing equipment. For the diversity of tightening methods and maintenance methods, proper tightening of bolts is very important for the workers around the equipment.
For example, nut rotation indicator, pre-tightening force indicator washer, wrench with digital sensor, hydraulic bolt tensioner and ultrasonic measuring device.
Luoyang East Axis helps designers to confirm the dimensions at the initial stage through the above devices.
High-strength hexagon bolt is not, but it has been successfully used in turntable bearings. This kind of high-strength bolt is relatively small and only needs less space. Of course, the contact surface under the nut is also small. Reducing the contact area will increase the contact surface into which the screw head is pressed. Risk of lowering bolt tension. High-strength hexagon-head bolts need hardened washers, which can avoid cutting and locking and bolt losing long tightening force. These factors will lead to early failure of bolts. It is reasonable to use washers with long tightening force. The above documents are provided by Ms. Dong Dongzhou.
Rolling Bearing for Luoyang East Axis Machine Tool Spindle.
The spindle assembly is the main component of the machine tool, and its working performance directly affects the quality and production efficiency of the machined parts. Machine tool spindle assembly is usually composed of spindle, bearing, rotating parts installed on spindle and some fasteners, among which bearing is a part that has great influence on assembly performance.
Basic Requirements for Rolling Bearings of Luoyang East Axis Machine Tool Spindle.
Rotation speed and temperature rise (LYDZZC).
With the development of science and technology, the spindle speed of machine tools is getting higher and higher, and the speed range is getting wider and wider. Therefore, the requirements for high running stability of bearings are getting higher and higher. The temperature rise of spindle bearing is an important factor to limit the speed of bearing. Usually, the high-speed performance of rolling bearings can be improved to a certain extent by correctly selecting the bearing type, tolerance level, configuration mode, game, preload and lubrication mode.
And bearing capacity (LYDZZC).
For general machine tools, the service life of the spindle assembly mainly refers to the service life for maintaining the spindle accuracy. Therefore, the accuracy maintenance performance of bearings is required to meet the service life requirements of the spindle assembly. For heavy machine tools or powerful cutting machines, the bearing capacity of bearings should be considered first.
Rigidity and seismic resistance (LYDZZC).
In order to ensure the price and quality of machine tools, it is necessary to make the spindle system have enough rigidity, otherwise, there will be a large error and even chattering. Seismic resistance refers to the ability to resist broken vibration and self-excited vibration. The seismic resistance of spindle assembly depends on the stiffness and damping of spindle and bearing. The stiffness of spindle system can be effectively improved by using pre-tensioned rolling bearings.
Noise (LYDZZC)
In high-speed grinding machines, the noise of grinding head bearings is the main component of the whole machine noise, so low-noise rolling bearings should be selected.
Rolling bearings commonly used in Luoyang east axis machine tool spindle and their characteristics;
Deep groove ball bearing (LYDZZC)
Generally, this kind of bearing is only used to bear radial load. Because the clearance is not adjustable, it is often used in occasions where the precision is not high and pre-tightening is not allowed, such as ordinary brick bed spindle, etc.
Angular contact bearing (LYDZZC)
This kind of bearings can bear radial and axial loads at the same time. Because internal axial forces will be caused when bearing radial loads, they should be installed and used in pairs, and their configurations include back-to-back, face-to-face, series and multiple connections. And through pre-tightening, the steel of the bearing can be improved. There are three kinds of contact angles of this kind of bearings: 15 degrees, 25 degrees and 40 degrees, among which B700CY high-precision angular contact ball bearing with a contact angle of 15 degrees is a professional bearing specially designed for the spindle of high-speed grinder. Except for the internal design changes, the bearing rings and rolling bodies are made of high-quality electroslag bearing steel. The material of the cage is phenolic laminated cloth pipe, and the tolerance levels are 5, 4 and 2. Therefore, this kind of bearing has high rotation precision and limit speed, small grinding and low temperature rise.
Bidirectional thrust angular contact bearing (LYDZZC).
230,000 bidirectional thrust angular contact ball bearings are usually selected, with a contact angle of 60 degrees, and are composed of a seat ring with lubricating oil holes, two shaft rings, a spacer ring and two groups of steel balls and cage components. Choosing the appropriate spacer height can make the bearing have the required preload after assembly.
This kind of bearing can bear bidirectional axial load, has good rigidity, low temperature rise during normal lubrication, high revolution and easy assembly and disassembly. As a new structure, it is mostly used on spindles such as grinders, lathes, boring machines, milling machines and drilling machines, and is often assembled with double-row cylindrical roller bearings in use.
Double-row cylindrical roller bearing (LYDZZC)
Roller bearing (LYDZZC)
For the sealing of Luoyang East Axis Bearing and Spindle Assembly, the following factors should be considered comprehensively when designing the sealing device of Spindle Assembly:
Adapt to the rotating speed of the spindle, the lubrication mode of the bearing and the working temperature, and have good sealing performance within the working pressure and temperature range. The grinding force of the sealing part should be as small as possible, and self-help compensation can be made to a certain extent after wear. (LYDZZC)
Adapt to the working environment of bearings and resist the corrosion of environment and lubricants. (LYDZZC)
According to the structural characteristics of the shaft end, the axial dimension of the sealing structure at the front bearing of the main shaft should be as small as possible to reduce the hanging amount at the front end of the main shaft. Sealing device shall facilitate the assembly and disassembly of spindle assembly. (lydzzc)
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