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Which caused the frequent damage of rolling mill bearings?
After analysis of effective data, the main forms of rolling mill bearing damage are fracture, wear and pitting. Damage form one: Fracture: inner and outer ring fracture, rolling element rupture, cage fracture The outer ring fracture is mainly caused by the excessive load and the insufficient bearing pressure. In addition to the cyclic load... After analysis of effective data, the main forms of rolling mill bearing damage are fracture, wear and pitting. Damage form one: Fracture: inner and outer ring fracture, rolling element rupture, cage fracture The outer ring fracture is mainly caused by the excessive load and the insufficient bearing pressure. In addition to the cyclic load, the inner ring is connected with the roll neck by the interference fit during installation. There is a positive tensile peripheral stress. As long as micro cracks are formed on the inner ring, they will rapidly spread and then cause fracture. In addition to the above reasons, another reason for the fracture is that the oil and gas supply in the roller box is insufficient or interrupted, causing the bearing to heat up and then lock, and then causing damage to the inner and outer rings, the cage and the rolling elements. Damage form two: How is wear and pitting caused? Most of the wear is caused by the relative rotation of the roll neck and the inner hole. There are two main reasons for pitting: the bearing material is unqualified, caused by improper heat treatment. Foreign matter enters into the roller box, and pitting occurs during the running of the bearing. In addition, due to improper operation, the copper bracket is deformed. When the roller enters the bearing housing, the ball rubs against the inner sleeve and then scratches the inner sleeve, so that the roller is inflexible during operation, causing bearing failure. The height of the roll gap on both sides of the rolling mill is inconsistent, which causes the bearing to be stressed at a certain point due to uneven force during the running of the roll, thus causing bearing failure. View Details
Common faults and solutions for CNC machine tool spindles
Problem one: the spindle without frequency conversion does not turn The cause of the failure and the solution: 1 Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral. 2 Three-phase power supply to the spindle is missing or inverting: Check the power supply and exchange any two ... Problem one: the spindle without frequency conversion does not turn The cause of the failure and the solution: 1 Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral. 2 Three-phase power supply to the spindle is missing or inverting: Check the power supply and exchange any two power lines. 3 Wrong circuit connection: Carefully refer to the circuit connection manual to ensure that the connection is correct. 4 The system has no corresponding spindle control signal output: use the multimeter to measure the system signal output terminal. If there is no spindle control signal output, you need to replace the relevant IC components or send it to the factory for maintenance. 5 The system has the corresponding spindle control signal output, but there is an open circuit or component damage in the power supply line and the control signal output line: use the multimeter to check the power supply circuit between the system and the spindle motor, and whether there is an open circuit in the signal control circuit; whether contact between the wires is not good; whether AC contactor or DC relay is damaged; check if the thermal relay is overcurrent; check if the fuse is burnt. View Details
How much do you know zys superfinishing machine?
Main features of the superfinishing machine: 1. This series of superfinishing in the way of centerless through-feed machine the surface, including the needle roller, cylindrical roller, taper roller, bearing ring, oil-needle, piston, spool etc. 2. After grinding process, the superfinishing process can improve the surface quality and the geome... Main features of the superfinishing machine: 1. This series of superfinishing in the way of centerless through-feed machine the surface, including the needle roller, cylindrical roller, taper roller, bearing ring, oil-needle, piston, spool etc. 2. After grinding process, the superfinishing process can improve the surface quality and the geometrical precision; the machines have high efficiency, precision and reliability, etc. It is widely used in the industry of bearing, car, motorcycle, pin valve oil pump and hydraulic parts, especially suited for superfinishing the crown of taper roller and cylindrical roller. 3. Through special designing and processing of guide roller, we can acheive several types of rollers, such as arc full crown type, logarithmic type. View Details
Common bearing categories in CNC turntables
CNC turntable is widely used in various CNC milling machines, boring machines, various vertical vehicles, vertical milling and other machine tools. In the design of the turntable, the types of bearings used are roughly divided into several types. 1. Thrust ball bearing + cylindrical roller bearing: Thrust ball bearing can withstand certain axial... CNC turntable is widely used in various CNC milling machines, boring machines, various vertical vehicles, vertical milling and other machine tools. In the design of the turntable, the types of bearings used are roughly divided into several types. 1. Thrust ball bearing + cylindrical roller bearing: Thrust ball bearing can withstand certain axial force, so the bearing is mainly used to bear the weight of the workpiece; and cylindrical roller bearing is mainly used for radial positioning and external force (eg cutting force, milling force, etc.). This type of design is widely used and relatively cheap. 2. Static pressure bearing + precision cylindrical roller bearing: Static pressure bearing is a kind of sliding bearing that relies on externally supplying pressure oil to establish a static pressure bearing oil film in the bearing to achieve liquid lubrication. Hydrostatic bearing always works under liquid lubrication from start to stop, so it has features of no wear, long service life and low starting power. In addition, this bearing also has the advantages of high rotation precision, large oil film stiffness, and can suppress oil film oscillation. Precision cylindrical roller bearings have good radial bearing capacity, and thanks to the use of precision bearings, the turnable's rotation accuracy is also well guaranteed. The turrets of this type can withstand high axial forces. Some workpieces weigh more than 200 tons 3. Cross roller bearing: the application of cross roller bearings on the turntable is also relatively common. Cross roller bearings are characterized by two raceways in the bearing and two rows of rollers arranged in a row. Compared with the traditional thrust bearing + radial centering bearing combination, the cross roller bearing is compact, and simplifies the workbench design, thus reducing the cost of the turntable. In general, the bearing, as the spindle and core component of the CNC turnable, plays a decisive role in the performance of the CNC turnable. In order to select the proper size and type of bearings, we need to consider various working conditions. View Details
Basic Knowledge of Bearing
The knowledge of mechanism is complex, and many small parts will have a great function and a lot of classification. For example, bearings. For people contacting machinery usually, the role of bearings is not to be underestimated. But for those who do not understand the bearings, the knowledge and function of bearings, is still confusing. In the fol... The knowledge of mechanism is complex, and many small parts will have a great function and a lot of classification. For example, bearings. For people contacting machinery usually, the role of bearings is not to be underestimated. But for those who do not understand the bearings, the knowledge and function of bearings, is still confusing. In the following, I will introduce you the basic knowledge of bearing. What is bearing The bearing is a small part comparing with a larger machine, but it plays a decisive role. And it is mainly used in the mechanical transmission process to reduce the friction coefficient of the load components. Bearings can be used to reduce the coefficient of friction during power transmission and maintain the centering of the shaft as other parts move relative to each other on the shaft. According to the different friction properties of moving parts, the bearings can be divided into rolling bearings and sliding bearings. Types of Bearing According to the function, design, and role of bearings, the types of bearings generally include: needle roller bearings, self-aligning ball bearings, deep groove ball bearings, spherical roller bearings, thrust bearings, with bearings, bearings, combination Bearings, mill bearings and so on. Different bearings have different functions, and play significant roles in different machinery and equipment. Bearing code A complete bearing code is composed of the basic code plus one or more supplementary codes. The basic code is used to indicate the type of bearing, bearing the basic design, bearing dimensions. Supplementary code refers to the bearing components, and the basic design has a different structure or other characteristics of the variant. 0 double row angular contact ball bearings 1 Self-aligning ball bearings 2 Spherical Roller Bearings, Spherical Roller Thrust Bearings 3 tapered roller bearings 4 double row deep groove ball bearings 5 Thrust ball bearings 6 deep groove ball bearings 7 angular contact ball bearings View Details
Adjustment and Usage of Spherical Ball Bearing Radial Clearance Measuring Instrument
1) Open the upper cover of the instrument load box, and install the big and small loads from the accessory box, and the small load should be on the side of detachable cam. Then according to the type of tested bearing, find suitable pull rod, replaceable sleeve, and replaceable washer. 2) Install pull rod, sleeve, tested bearing, washer, and inst... 1) Open the upper cover of the instrument load box, and install the big and small loads from the accessory box, and the small load should be on the side of detachable cam. Then according to the type of tested bearing, find suitable pull rod, replaceable sleeve, and replaceable washer. 2) Install pull rod, sleeve, tested bearing, washer, and install comparable instrument. 3) Adjust the positions of the two loads (One is large, and the other is small) according to the size and model of the tested bearing. Scale marks 5, 10, and 15 mean the loading values. When using 5-10 kg load, the small load cam should be removed. When using 15 kg load, both sets of loads should be added and the two load blocks are located at the corresponding numerical scale line of the two load bars. 4) Rotating the handle for load transfer and adjusting the upper and lower brackets on the cylinder according to the range of the motion of the cylinder so that the load can be correctly pressed to the upper and lower center fulcrum of the tested bearing through the pressure roll on the bracket. Axial contact parallelism between roller and bearing can be fine-tuned through the two upper and lower quadrilateral screws. 5) After the above adjustment, pulling the load transfer handle, so that the tested bearing can be loaded up and down alternately, and the clearance value can be read from the comparator's value. View Details