Manual balancing

SBSThe balancing system is fully automatic, but it can also be manually operated. The ability to manually move the counterweight within the balancer is very useful for performing diagnostic tests,
And allow operators to manually balance the machine when needed.

By pressing“Manual”The button accesses the manual balancing button. When no speed signal is received from the balancer, the arrow button can be used to set the value,
Then press“confirm”Button to manually specify a speed. The buttons are divided into two groups, each group controlling one of the two counterweights in the balancer（M1AndM2）.
Each counterweight can move forward or backward according to the rotation of the grinding wheel.

Only one button can be operated at a time.
To manually balance, move two counterweights in the direction of reducing vibration readings on the display screen. This is achieved through three stages.

The 1 Stage:Move two weight blocks equally in the same direction, either forward or backward. If moving them in one direction causes an increase in vibration, choose the opposite direction.
Continue in this way until the vibration value no longer decreases. This movement evenly positions the two counterweights near the line passing through the center of the grinding wheel and the center of imbalance (white dots in the figure) (Figure)19a）.

The 2 Stage:Find the relative position for the counterweight block“Centerline”ofCorrect angle (Figure)19b）. By moving the weight blocks equally in different directions (one forward and one backward).
Once again, if the vibration value increases, try moving the counterweight in the opposite direction. Continue in this way until the vibration value no longer decreases.

The 3 Stage:The balance level can be fine tuned by individually moving the counterweight in small increments to greatly reduce vibration readings.

Any change in the vibration value of the machine will lag behind the movement of the counterweight by one or two seconds. This is a machine“Stable effect”Caused by.
When the correct direction of movement is not immediately clear, or when the vibration value itself is small（2.0 When measured in micrometers or smaller,
Any movement of the counterweight should be made in small increments, with a delay of two seconds between movements to evaluate the effectiveness of each movement.

Environmental considerations

SBSThe balance system is designed to dynamically correct the harmful effects of grinding wheel imbalance on the quality of surface and part geometry, as well as the lifespan of grinding wheels and machine bearings. The system cannot correct other environmental issues.
This section aims to discuss some common environmental issues that may affect grinding quality.

Other sources of vibration:

The common source of vibration is adjacent machines. If a vibrating machine is running nearby, the grinder should be properly isolated and installed. Other sources of vibration may be components installed on the machine,
For example, pumps, motors, drivers, etc.

SBSThe balancing system may not operate effectively under the influence of certain external vibrations. System on spindleRPMFilter the vibration signals detected by the grinder in the frequency range.
This means that the system will ignore vibrations that occur at frequencies other than the rotating wheel.
For nearby machines operating at the same frequency or in phase with that frequency, the system cannot distinguish between vibrations caused by imbalanced grinding wheels and vibrations caused by adjacent machines.

When the spindle is not rotating:
Monitoring the vibration value of the grinding machine is an excellent environmental vibration test. Vibration values should be checked at various locations on the grinder, especially where vibration sensors are to be installed.
During this testing period, all surrounding equipment, including any accessories on auxiliary pumps or grinders, should be operated.
SBSThe balancing system can assist in performing this test(See:“Background vibration”One section),But it cannot eliminate these vibrations.

Machine condition:

In determiningSBSWhen the balance system can achieve a small balance level, the condition of the grinder is an important factor.
The spindle and all components in the spindle drive system (such as drive belts, pulleys, motors, etc.) should be balanced.
The balance system can be used to easily determine whether the machine itself has significant imbalances.
Easily use the above methods to check for environmental vibrations, but do not include checks when the spindle is running or when the grinding wheel is not installed.
SBSThe balancing system cannot eliminate vibrations caused by machine condition issues.

System installation

External equalizer/Adapter

The balancer is installed onto the machine spindle through the provided adapter (Figure4a）. The installation adapter is designed specifically for the spindle configuration of a specific machine, so there are differences in design.
Generally speaking, an adapter consists of two components.

Adapter nutInstalled on a grinder, it usually replaces the spindle nut at the grinding wheel end or pulley end of the spindle.

Adapter flange:Secure to the balancer with bolts and install in the installed adapter nut. Both components have corresponding wrenches.
It is recommended to use lubricant between the balancer and the installation adapter to ensure easy disassembly in the future.

Locking screw:This is a feature of many adapter designs, which is required for high machine speeds or machine spindle braking.
These locking screws include those installed on the adapter nut surfaceM6Concave head fixing screws and those installed in the outer diameter of the adapter flangeM5Concave head fixing screw.
Before dismantling or disassembling the adapter, these locking screws should be loosened.

Warning!!-
every timeWhen installing adapter nuts or adapter flanges, all locking screws must be properly secured to prevent the components from loosening during the operation of the grinder.
Should be usedTighten the wrenchScrew (torque provided by standard manual wrench, hammer or other tools are not allowed).

Follow this assembly procedure to ensure proper installation of adapter nuts and flanges, locking screws are part of the adapter design:

aboutTest Report on the "SBS" Dynamic Balance System Crankshaft Grinding Machine

Example:Shanghai Volkswagen Engine Factory has successively equipped several British Landis crankshaft grinders that have been in service for ten yearsThe SBS grinding wheel dynamic balancing system has achieved good results.
Taking the spindle neck five grinding wheel grinder installed this spring as an example: although five grinding wheel sets with a diameter of 1.1 meters are newly installed, they can be staggered according to the factory markings to achieve a certain degree of initial balance;
But before installing SBS, after a period of use, the unbalanced state of each of the five grinding wheels deteriorated in an irregular vector superposition, and the actual vibration values may often become very poor.
Before installing the SBS system, the vibration of the grinding wheel was measured to be 7-9 μ m, and after installation, it rapidly decreased and remained at 0.5-0.9 μ m. A series of precise measurement results show that the improvement of workpiece roundness is quite significant.

Not adoptedWhen SBS is used, the roundness of the five main spindle necks not only varies greatly, but also partially exceeds the tolerance: 2.66-6.34um; Adopting SBS

Afterwards, the roundness values significantly increased and became very close to each other:1.40-1.99um. (See the table below and Figure 6)

Example:Germany located in Waigaoqiao, ShanghaiFAG Bearing Factory has successively equipped four old centerless grinding machines with SBS systems, and the grinding roundness of bearing rollers has been steadily improved and controlled.
According to the measurement report from the factory, the roundness has increased from 1.00um to 0.15um, ensuring the excellent quality of the returned European products.

Selection of SBS dynamic balancing head specifications