Requirements for machine tool spindle bearings

In the machine tool bearings, bearings is widely used. Spindle bearing with certain technical requirements. Introduce to you the following analysis

1 speed and temperature

With the development of science and technology, more and more high spindle speed, speed range and thus the greater the deep groove ball bearing high speed stability requirements are also increasing. Machine tool spindle bearing temperature is an important factor in limiting speed of the bearing. Under normal circumstances, the right choice bearing type, tolerance levels, configuration, clearance (preload) size, lubricants and lubrication, etc., to a certain extent, improve the speed performance of rolling bearings.

(2) carrying capacity and life

The general machine tool, the life of the main spindle assembly to maintain accuracy of the spindle is its period of use, therefore, required to maintain the accuracy bearing spindle assembly performance to meet life requirements. For heavy-duty machine tools or powerful cutting machine, you should first consider the bearing capacity.

3 stiffness and vibration resistance

To ensure the quality of the machining, the spindle system must have sufficient rigidity, otherwise it will have a greater re-mapping error even flutter. Vibration resistance refers to the forced vibration and self-excited vibration capability. Spindle assembly vibration resistance depends on the spindle and bearing stiffness and damping. Using the preload bearing can effectively increase the stiffness of the spindle system.

4 Noise

In high-speed grinder, the grinding noise and bearing noise is the main ingredient should be used in low-noise rolling bearings.

Double row deep groove ball bearing wear prevention

Due to wear caused by the amount of material loss referred to wear. This can be by measuring the length, volume, or mass to obtain the change, and accordingly they are called wire wear
Volume, the volume and quality of wear wear.

   Double row deep groove ball bearing mainly refers to installation and adjustment factors, use and maintenance, repair and other maintenance meets the technical requirements. According bearing installation, use, maintenance
Care and maintenance of the technical requirements for the operation of the bearings to withstand load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, hair
Are abnormal immediately find reasons to adjust it back to normal. Installation conditions are the primary factors that one of the factors bearing is often caused by improper installation
Resulting package bearing between the various parts of the stress state changes, bearing in abnormal state of operation and early life of the inner end of the main factors is the knot
Structural design, manufacturing processes and materials quality double row deep groove ball bearings determine the quality of three major factors.

1 improper use bearings.

Cause: The installation, operation, or improper removal may cause deformation or defect in the cage

Recommendation: Use the appropriate operating, installation and removal tool

(2) inadequate lubrication

Reasons: inadequate or improper lubrication may cause abrasions or serious element of the double row deep groove ball bearing deformation

Recommendation: Improved lubrication system, aptly timed to supplement or replace the lubricant

3 rust and corrosion

Cause: Contact with water may cause water pump bearing element pitting and rusting. Rust after injury double row deep groove ball bearings at work may cause spalling

Recommendation: regularly check seals to ensure good sealing effect, correct storage of imported bearings

4 Current

Cause: The rotation is powered may cause grooves or nicks. Double row deep groove ball bearing is stationary, electrically operated Improper grounding can cause minor burns

Recommendation: In the outside of the bearing parts before welding through proper ground connection to reduce or avoid the current through the bearing

5 External materials

Cause: The abrasive particle contamination and debris intrusion may lead bearings face wear, abrasions and depression

Recommendation: Clear intrusive particles and debris, replace the lubricant, check the sealing system

6. Eccentric

Reason: eccentric, inclined or excessive load may result in geometric stress concentration or flaking

Recommendation: precision machining imported bearing and retaining shoulder

Double row deep groove ball bearings after installation, in order to check for proper installation, operation should be checked. Small machines can be rotated by hand to confirm whether the rotation along
Cheong. Check the project due to nick, indentation caused by dysfunctional, because poor installation, mount the torque generated by poor processing unstable, due Tour
Gap is too small, the installation error, caused by seal friction torque is too large and so on. Without exception, you can begin powering.

Deep groove ball bearings rust knowledge

Deep groove ball bearing division between the rust and rust usually finished rust.
 Workers between the rust belongs antirust processing, usually in 3-30 days. Will generally water-based rust inhibitor can be. The advantage of water-based rust inhibitor is a simple operation and low cost. And rust after degreasing cleaning is not required.

 Finished rust generally refers to the deep groove ball bearing assembly before storage or rust after delivery, usually within a month to 2 years or so. General use apply anti-rust oil or rust VCI paper packaging. VCI antirust paper packaging has the advantage of good rust, free cleaning before assembly, easy to operate, environmentally friendly energy.

 VCI antirust paper will always release a small amount of rust inhibitor (VCI Definition: volatile corrosion inhibitor). In this paper, the package, the package is formed in a protective layer of gas can be reliably suppressed corrosion of deep groove ball bearings. VCI rust-proof paper in direct contact with the bearing and have anti-rust within a certain distance; bearing VCI antirust paper packaging rust, rust-proof up to 3 years; bearing VCI antirust film packaging rust, rust up a years. This is the most used product Harbin HRB, now commonly used in plastic barrels rust processes.

Affect the life of deep groove ball bearing analysis of the factors

Deep groove ball bearing material largely determines the bearing life, once the metallurgical quality bearing steel GCr15 early bearing failure is caused by the most important reason. Technically increased dramatically in the metallurgical, bearing steel and other materials have appeared, has been greatly improved.
 In bearing failure analysis, from raw material bearing failure caused the proportion has also been greatly improved, but is still manufacturing materials main bearing failure, but also with deep groove ball bearing service life considerably relations.

 Bearing complex manufacturing process, to go through several processes before they can get the finished product, including forging, heat treatment, turning and grinding and other processes to complete the technical ability and quality, will affect the bearing life and apply effects, especially heat treatment and grinding process, it is the direct cause of many bearing failures, manufacturers need to be highly valued.
 deep groove ball bearing after installation, in order to check the installation is not correct, you want to run checks. Small machines can be rotated by hand to make sure is not rotate smoothly. Check items mainly due to foreign bodies, indentation caused by dysfunctional, because poor installation, mount poor processing and the emergence of torque instability, because clearance is too small, the installation error, caused by seal friction torque is too large, and so . If no exception, you can begin powering.
 On the shaft and bearing, the bearing requirements in the radial, axial and tangential direction in three directions fix its position. Radial and tangential positioning through the tight fit of the bearing rings mining achieve axial positioning only in a few cases, a tight fit; generally use limit axial parts, such as end caps and rings etc. is limited to the axial position In the clearance range.
     Select match should focus on the following four points:
   (A) the bearing rings and the circumferential surface should be well supported even by force, in order to reduce distortion, and give full play to the bearing capacity.
   (2) In its mating surface of the ferrule can not slide along the tangential direction, otherwise it will damage the mating surfaces.
   (3) the free end of the shaft and the bearing must be capable of bearing adapt to changes in length of the hole, which must have to adapt to the axial position in a range of swimming ability.
   (4) must pay attention to the deep groove ball bearing mounting and dismounting is simple, saving time and labor costs.