Machining
A spindle motor protection system interrupts the power flow of the spindle motor due to a collision-induced overload and protects the shock-sensitive components. The protective device includes a double flange with a permanent magnet that applies the adhesive force at the separation point.
In metal
cutting machine tools perform violent collisions between the travel axis and the collision object of substantial property damage. SO 70% of machine failures with long downtime and high repair costs caused by collisions. Mainly affected components are the spindle nut drive and the motor spindle dar.
Collisions in machine tool spindle motor also damage
The causes of conflict are numerous. A common source of error in addition to programming errors, incorrect definition tools, incorrect offsets, not interfering contours also considered unintentional use of the machine axes with high rapid traverse. Manual emergency stops often can not avoid the crash in time.
Through the use of mechanical security elements with high reactivity can be effectively prevented subsequent damage. Because of the simple integration of safety clutches, to separate the crossing of a boundary moment the power flow between the feed and spindle drive are mounted.
This creates the disadvantage that the spindle nut system after disconnecting the power flow remains the collision forces. As safety couplings for
high-dynamic machine tools, especially those with linear motor feed drives, are not a satisfactory solution, the use of alternative security systems to protect the spindle motor is required.
To add to the protection system in detail: permanent magnet holds the double flanges
Protection system in detail: Permanent magnet holds the double flanges
The structure of the spindle motor protection system shows the individual components. The Doppelflanschsystem consists of self-centering joint surfaces with indexing that define the position and orientation of the flanges to each other at the separation point. The flanges are each installed motor spindle and the machine side.
The permanent magnet system results in the cohesion of the dubbel flangin system. When crossing the oversized adhesive force is the immediate separation of the flanges. As the air gap, the magnetic force decreases rapidly. The closed magnetic flux interference will not occur or attraction forces outside the system.
The spring elements are used to increase the stiffness of the floating guide during the disengagement and the spring return of Motorspindelflansches after retraction. The springs are anchored on the machine side.
The shock absorbing elements in addition during the disengagement, the kinetic impact energy. Relevant injury collision-induced force peaks are due to the power flow decoupling of the motor spindle effectively absorbed.
The status inquiry of the support of the flanges to each other via system-integrated proximity switches. When Flanschtrennung the contact is released and activates a control implemented in the automatic collision detection. The seal (f) consists of flexible sealing wipers to protect the system against the penetration of fluids, chips and dirt.
Spindle motor protection system interrupts the power flow at an early stage
The newly developed engine protection system of spindle-Jakob drive technology ensures high rigidity at the interface between the headstock and spindle motor and interrupts the power flow directly and at an early stage of the spindle motor due to a collision-induced overload. Thus, the shock-sensitive components of the spindle motor from the otherwise effective peak forces during the collision to be effectively protected.
The spindle motor-protection system has been developed as a collision and overload protection for installation in the power flow between machine tool and spindle motor. The basic kinematics allows for crossing a border force dimensionable the 3D displacement of the spindle motor. The deflection can be effected depending on the overload and collision, either by axial disengagement or lateral swinging of the motor spindle with axial or radial tool collision.
Flanges separated in case of exceeding the holding force
The protective device includes a self, positively intertwined dubbel flanging system. The adhesive force at the separation point is indicated by a raised specifically for the application developed permanent magnet system. This is designed according to a predetermined limit or a border adhesive bond strength torque of the engine or motor spindle manufacturer.
When crossing the adhesive force at the joint causes the magnetic system an immediate separation of the machine tool and spindle motor pre-installed flanges. With the removal of the motor-spindle side flange, and thus increasing the air gap, the magnetic force decreases rapidly.
After separating radially arranged and take over the machine side anchored spring elements, the support and guidance of the floating flange of the spindle motor side. The springs act opposite to the deflection and thereby enable the motor spindle to deflect an adjustable travel.
collision pads absorb kinetic energy in addition to spring elements
Installed parallel to the spring elements absorb additional collision pads during the disengagement, the kinetic impact energy. Relevant injury collision-induced force peaks are due to the power flow decoupling of the motor spindle effectively absorbed.
To add to the protection system in detail: permanent magnet holds the double flanges
Protection system in detail: Permanent magnet holds the double flanges
The structure of the spindle motor protection system shows the individual components. The Doppelflanschsystem consists of self-centering joint surfaces with indexing that define the position and orientation of the flanges to each other at the separation point. The flanges are each installed motor spindle and the machine side.
The permanent magnet system results in the cohesion of the Doppelflanschsystems. When crossing the oversized adhesive force is the immediate separation of the flanges. As the air gap, the magnetic force decreases rapidly. The closed magnetic flux interference will not occur or attraction forces outside the system.
The spring elements are used to increase the stiffness of the floating guide during the disengagement and the spring return of engine spindle flange after retraction. The springs are anchored on the machine side.
The shock absorbing elements in addition during the disengagement, the kinetic impact energy. Relevant injury collision-induced force peaks are due to the power flow decoupling of the motor spindle effectively absorbed.
The status inquiry of the support of the flanges to each other via system-integrated proximity switches. When flange separation the contact is released and activates a control implemented in the automatic collision detection. The seal (f) consists of flexible sealing wipers to protect the system against the penetration of fluids, chips and dirt.
To detect collision detection by the machine control in the spindle integrated proximity switch permanently to support the flanges to each other. When Flanschtrennung the contact is interrupted and implemented by the automatic control system, the axes of the
machine tool to slow down and put to a stop.
During the subsequent retraction of the spindle motor from the collision by the axes, the protection system due to the pressure force of the springs and the self-centering design separation points is again precisely fit into the starting position and position. The protection system is designed to reversibly available and can also survive repeated collisions in the life cycle of the machine from damage.
Flexible sealing wipers protect the spindle motor protection system
The closed flux of the permanent magnet system, there are no interferences or attractions on the outside of the system. Flexible sealing stripper further protect the system against the ingress of fluids, chips and dirt.
In summary, the following system benefits:
- energy self-sufficient, passive mode of action
- high adhesive strength for reliable Edit
- high degree of rigidity to obtain the maximum adhesive force
- Absorption of kinetic energy by shock absorber,
- integrated query of steering condition for emergency stop,
- automatic resetting with high accuracy,
- adaptable to all conventional spindle motor geometries,
- faster than purely electronic monitoring systems,
- Increase machine availability,
- maintenance.
