DE102008028379B3 - Tension rolling device for circular saw blade, has generator formed by electric motor, where transmission force of motor acts on system and acts against operating pressure such that rolls are vertically engaged at distance together - Google Patents

Abstract

The device (1) has an outer force generator (13) formed by an electric motor (16) e.g. servo linear motor. Another electric motor (17) is activated by an output signal of an electric control unit (5) when an aperture (7) passes through a pressure zone of working rolls (10, 11). The motor (17) is engaged at a position at a lever system (15). Transmission force of the motor (16) acts on the system, and acts against predominant operating pressure such that the rolls are vertically engaged at a distance together, where the distance is larger or equal to measure of a free-wheel slot (12).

Description

The The present invention relates to an apparatus for tension rolling from circular saw blades to Preamble of the main claim.

Circular saw blades and the like Tools become a stress rolling process during manufacture subjected in which by means of roller pairs internal stresses in circular saw blade be achieved. As a result, thermal stresses and centrifugal force while the operation counteracted, so that the circular saw blade does not deform during work becomes and / or gets out of balance.

From the Laid-open publication DE 10 2006 026 043 A1 a device is known, which with respect to the circular saw blade level has an upper and a lower roller frame, which carries in each case an upper or lower work roll. The work rolls face each other to form a freewheeling gap which is kept free for the circular saw blade and can be moved relative to one another by means of an external force transmitter. The outer force transducer causes a force transmission to the work rolls, so that the work rolls can exert pressure on the circular saw blade running in between.

When Force transmitter is preferably a pneumatic or hydraulic Piston-cylinder unit provided.

The Utility Model DE 82 11 872 discloses a circular saw rolling machine, which operates on the principle of the publication described above, in which case the contact pressure is applied to the work rolls by muscle power via a lever system and a threaded spindle.

From the European Patent Publication 0 521 824 B1 is a circular saw blade straightening machine known, which also provides an additional pair of rollers or rollers for tensioning in addition to the straightening tools. The pairs of rollers work according to the known principle to einwalzen desired voltages in the circular saw blade.

at This machine is the circular saw blade on one perpendicular to the circular saw blade level aufspannbar standing axis. The axle comes with an electric Drive unit driven. Furthermore, this machine has a electrical control unit for receiving signals from a detection unit, which breakthroughs recorded in the circular saw blade, and for receiving a proportional to the speed of the axis signal and for processing these signals into an output signal.

in the Contrary to the already mentioned two publications can at this device breakthroughs in the circular saw blade be detected automatically.

With but the known devices can only circular saw blades without breakthroughs with a continuous rolling process, d. H. under constant Feed and constant contact force are processed.

It is therefore an object of the present invention, a fully automatic Apparatus for tension rolling of circular saw blades using a for reinforcement to provide the roller pressure lever system, with the especially with breakthroughs Providing circular saw blades under steady feed and a constant acting on the work rolls Contact force constant internal stresses can be conveyed without Deformations at the breakthroughs occur.

These Task solves the invention with the features of the main claim.

The Invention has recognized that with the known devices in with breakthroughs provided with circular saw blades be processed under continuous feed, the action of the roller pressure responsible power generator must be withdrawn in time, so that the work rolls during the passage phase of the breakthrough through the pressure zone at least with the measure of Freewheel gap are spaced from each other. This ensures that that this passage, especially at the edge regions of the openings, depressurized takes place and thus a deformation of the openings not takes place.

Of the Essential advantage of the invention is now that by the changing force at the points of breakthroughs none Areas with decreasing and again increasing tensions in the material be introduced. Also in the field of breakthroughs according to the invention with a rolled constant force.

The Invention leaves continue to recognize that such areas with changing internal stresses at known devices occur when with constant feed is rolled.

The Extension of these areas, where with known devices can not be rolled with a constant force, beyond that additionally determined by the reaction properties of the force transducer. Become in devices according to the prior art, for example for the force transmitter Hydraulic or pneumatic systems used, this circumstance due to reaction inertia These systems are particularly clear.

In addition to this, an acting force, for example, according to the above-described document DE 82 11 872 reinforced by means of a lever system to a higher contact force, this area is further increased according to the way that is covered to achieve a higher contact force due to the lever set.

Independent of the reaction properties of the the roller pressure responsible force transmitter they are subject to voltage fluctuations Not according to the invention on.

The Invention has further recognized that with known devices one with breakthroughs circular saw blade only constant internal stresses can be mediated, if the rolling process for the reasons outlined above not consistent Feed takes place. Here must be timely before a breakthrough the feed of the circular saw blade being stopped. Only then can the action of the force transmitter for Forming the freewheel gap retracted be without the introduced internal stresses vary significantly. After the breakthrough moves through the print zone of the work rolls was, must first the power transmitter has started up again to its working value, before you can continue working with feed. In contrast to Processing of circular saw blades without breakthroughs Here, the effort is considerably higher.

Of the Effort of such a stop-and-go operation with circular saw blades with Breakthroughs, will avoided according to the invention.

Farther results from the invention of the advantage that in a steady Feed through the pressure zone of the work rolls moving circular saw blade up to the edge areas of the openings constant internal stresses can be rolled without there is a risk that the edge areas will be rolled over and thus deformed become.

According to the invention otherwise constant working pressure just before the edge areas the breakthroughs temporarily interrupted by a second force generator by the work rolls abruptly occupy a distance to each other, the greater or at most equal to the size of the freewheeling gap is. Once the passage of the apertures through the pressure zone of Work rolls is done, the second force generator is deactivated and the work rolls take through the existing working pressure abruptly again the working distance to each other. Therefore, can shortly after the passage of the openings at the edge regions be rolled again with the full manpower.

As a result, sets the flow of the material displaced by the constant working pressure just before the Edge areas of the openings off or on again so that no deformation can occur there.

Farther it is essential that by the inventive quick adjustment of the work rolls by a second force transducer the reaction properties of the for the roller pressure responsible external force transmitter no effect on the voltage curve of the introduced internal stresses exhibit.

Therefore may be the action of the external force transmitter without further inventive by a Spindle and are reinforced by a lever system to a greater contact pressure, without in this case the disadvantages mentioned above come into play.

Favorable Mode engages executed as an electric motor second force transmitter to a Position on the lever system, which has a shorter lever than the location of the lever system at which the transmitted force of the first Electric motor acts. As a result, the zurückzulegende stroke of the second Electric motor to form the freewheel gap kept as short as possible.

In a preferred embodiment of the Invention engages the second electric motor therefore without its own lever arm at the pivot point of the lever system, so that the lifting movement along a force of action line extending through the axis of rotation of the lever system runs.

Farther essential is that for the function of the invention the device no pneumatic or hydraulic components needed especially to apply a high working pressure. There Never leak leaks in hydraulic components due to high pressures excluded are, the device of the invention is characterized as particularly environmentally friendly.

moreover the maintenance effort is less.

One Another advantage of the invention is that by the electrical Drives easily feedback can be done to the control unit, for example, the data of the manufacturing process for a later proof of quality prepare.

In addition thereto, it is furthermore conceivable that the device according to the invention is also associated with a deflection device for checking the tension of the circular saw blade. Based on total Depending on the data of the production process and the determined values of the stress test, areas on the circular saw blade can be approached with pinpoint accuracy according to the invention in order to carry out any correction of the voltage which is to be made there.

Also would be conceivable that pressure sensors are mounted on the lever system and with the control of for coupled to the working pressure force generator are coupled. hereby an even better and controllable pressurization is achieved.

Farther limited The invention is not limited to the machining of circular saw blades, but Can also be used for tensioning circular knives or similar Cutting tools are used.

Around To make sure that the edge areas of the breakthroughs exactly At the recognized points depressurized, it is suggested that the work rolls each at equal distances from the central axis of the circular saw blade are arranged and the detection unit of the central axis accordingly these distances is spaced and opposite to a certain angle (measured the direction of rotation of the axis) is offset to the work rolls. hereby is the detection unit and the pressure zone of the work rolls on a common circular path around the central axis of the circular saw blade.

Farther It is proposed that the detection unit is a light barrier, which z. B. from a above the circular saw blade level arranged light source and one below the saw blade level arranged detector consists. Preferably, this is the light source a laser beam.

The Width of the breakthrough can be determined very accurately thereby and based on the rotational speed of the axis and the predetermined angle the detection unit to the pressure point of the work rolls, the Tension rollers to the millimeter exactly to the edge zones of the breakthroughs into it, without fear of deformation at the edge zones.

Around the circular saw blade to provide a steady and consistent feed is proposed that the electric drive unit of the axle is only active, when the second electric motor is activated and that the circular saw blade with inactive electric drive of the axle only by the roller pressure is transported.

hereby the speed of the axis remains constant even if a pressure-less according to the invention Pass the breakthroughs through the pressure zone of the work rolls.

Farther It is suggested that the axle together with the clamped Circular saw blade like this slidably mounted, that the circular saw blade between the work rolls is deliverable and the delivery movement via an electric drive.

By This measure In particular, can be within a single operation several rolling marks in the circular saw blade rolled in.

Preferably is for the electric drive of the delivery uses a servo linear motor. Also for the second electric motor is in particular a servo linear motor intended. Both the feed movement and the quick adjustment according to the invention done with precise movements under high achievable forces and big ones Accelerations. In addition, such drives have a high repeatability positioning and low operating and maintenance costs.

In addition to this It is suggested that the first electric motor is a servo linear motor with spindle drive is.

preferably, is for the electric drive unit of the axle provided a servomotor.

With the high dynamics and accuracy of such servo drives, in conjunction with high resolution optical encoders, can the constant working pressure of the work rolls targeted to act on the edge regions of the constantly moving breakthroughs, without the risk of deformation at the openings exists.

in the Below, the invention will be explained in more detail with reference to embodiments.

It demonstrate:

1 the device according to the invention in a schematic representation;

2 a circular saw blade machined according to the invention in top view;

3 the device according to the invention in side view;

Provided not otherwise stated below, the following description applies always for all figures.

Especially 1 and 3 show one contraption 1 for tensioning circular saw blades 2 , The circular saw blade 2 is on an axis perpendicular to the circular saw blade plane axis 3 clamped. The axis 3 is powered by an electric drive unit 4 driven.

The device 1 further comprises a control unit 5 for recording signals. The signals originate from a detection unit 6 which breakthroughs 7 in the circular saw blade 2 recorded, and on the other of the electrical drive unit 4 which one to the speed of the axle 3 sends proportional signal. The received signals are from the control unit 5 processed to an output signal.

The device 1 with respect to the circular saw blade level has an upper and a lower roller frame 8th . 9 on. The roll racks 8th . 9 wear an upper or lower work roll 10 . 11 , The work rolls 10 . 11 are under education for the raised circular saw blade 2 kept freewheeling gap 12 arranged opposite.

Both roll racks 8th . 9 are by an external force transmitter 13 relatively movable to each other.

In this example, the force transmitter 13 the upper roller frame 8th assigned. The power of the force transmitter 13 is via a spindle 14 and a lever system 15 on the upper stripper 10 transferred so that the work rolls 10 . 11 Pressure on the circular saw blade running in between 2 exercise.

It is essential here that the external force transmitter 13 from a first electric motor 16 is formed and a second electric motor 17 then by the output signal of the control unit 5 is activated when a detected breakthrough 7 the pressure zone of the work rolls 10 . 11 passes.

By this measure, the inventive quick adjustment of the work rolls, despite still existing working pressure by the force transmitter 13 at the work rolls. The second electric motor 17 counteracts the prevailing working pressure that the work rolls 10 . 11 abruptly take a distance to each other, which is greater than or at most equal to the size of the freewheeling gap ( 12 ).

In the field of breakthroughs 7 the taking place under constant contact pressure Einwalzvorgang is abruptly interrupted and continues after passing through the constantly moving breakthroughs 7 abruptly by deactivation of the second electric motor 17 with full contact force of the work rolls 10 . 11 continued.

Without deformations occur at the edge regions of the openings, so the circular saw blade 2 constant internal stresses are transmitted to the edges of the openings. The introduced stresses in the circular saw blade 2 are equal to a rectangular sequence, the peak value of the constantly introduced internal stresses and their zero line almost the dimensions of the continuous breakthroughs 7 equivalent.

Furthermore, it is essential that the circular saw blade 2 throughout the machining process at a steady and constant speed around the axis 3 rotates.

Although a lever system 15 in connection with a spindle 14 to reinforce one by the electric motor 16 acting force to a larger worker at the work rolls 10 . 11 is used, the voltage curve of the rolled internal stresses remains constant.

Due to the rapid adjustment of the work rolls according to the invention 10 . 11 can a circular saw blade 2 with breakthroughs 7 be provided with constant internal stresses almost as fast as a circular saw blade 2 without breakthroughs.

According to the invention, the second electric motor engages 17 at one point on the lever system 15 which has a shorter lever arm than the location of the lever system 15 , at which the transmitting force of the first electric motor 16 acts.

As a result, stroke is saved around the freewheeling gap 12 during the phase of the quick adjustment by the second electric motor 17 to build.

In the example shown, the second electric motor engages 17 in a preferred manner without own lever arm at the fulcrum 18 of the lever system 15 at. Regardless of the design of the lever system 15 just needs the storage of the lever system 5 be lifted around the freewheeling gap 12 to build.

Furthermore, it is provided that pressure sensors on the lever system 15 are attached and with the control of responsible for the working pressure electric motor 16 are coupled. As a result, an improvement in the pressurization is achieved.

Especially 1 and 3 show that the work rolls 10 . 11 at equal distances from the central axis of the circular saw blade 2 are arranged. In particular in 1 and 2 is shown that the detection unit 6 from the central axis of the circular saw blade 2 can be spaced according to these distances and by a bestimm th angle α (measured against the direction of rotation of the central axis) to the work rolls 10 . 11 is offset.

By the speed of the axle 3 and the fixed angle α, the control unit 5 Calculate the exact time at which a detected breakthrough 7 the pressure zone of the work rolls 10 . 11 reached.

In particular in 1 is shown that the detection unit 6 a light barrier, which consists of a light source arranged above the circular saw blade plane 19 and a detector disposed below the saw blade plane 20 consists.

Preferably, the light source 19 a laser beam. For the detector unit 6 Thus, a high-resolution encoder is provided to those on the rolling path of the work rolls 10 . 11 moving edge areas of the openings at a constant speed 7 to be determined exactly.

It can also have more than one detector unit 6 be provided to z. B. for both directions of rotation of the circular saw blade 2 the breakthroughs 7 with both sides of the work rolls 10 . 11 offset attached detector units 6 capture.

During the rolling of the internal stresses, the circular saw blade becomes 2 only by the roller pressure of the work rolls 10 . 11 transported at a constant speed. The electric drive unit 4 the axis 3 is only active when the second electric motor 17 is activated. This ensures that during the quick adjustment according to the invention, the circular saw blade 2 is moved on at a constant speed.

The axis 3 is together with the clamped circular saw blade 2 mounted so displaceable that the circular saw blade 2 between the work rolls 10 . 11 is deliverable. The infeed movement takes place via an electric drive 21 ,

Within one operation, multiple rolling tracks can be rolled in this way. Through the control unit 5 can hereby z. B. the number of rolling tracks can be programmed.

As an electric drive 21 the delivery, in particular a servo linear motor is used. Also the second electric motor 16 is preferably a servo linear motor.

hereby can the straight-line movements precise and with high repeatability.

For the quick adjustment according to the invention means this about it In addition, high forces act in fast and dynamic movements.

In addition to this, preferably the first electric motor 16 intended as a servo linear motor with spindle drive.

In addition, the electric drive unit 4 the axis 3 preferably a servomotor. Overall, the high dynamics and accuracy of such servo drives combined with the high-resolution optical encoders of the detector unit 6 a precise control of the second electric motor 17 for the quick adjustment according to the invention.

1

contraption for tension rolling

2

circular saw blade

3

axis

4

electrical drive unit

5

electrical control unit

6

Detection Unit

7

breakthroughs

8th

upper roll stand

9

lower roll stand

10

upper Stripper

11

lower Stripper

12

Freewheel gap

13

external force transmitter

14

spindle

15

lever system

16

first electric motor

17

second electric motor

18

pivot point

19

light source

20

detector

21

electrical Drive angle

α

angle

Claims (12)

Contraption ( 1 ) for tensioning circular saw blades ( 2 ) or similar tools, with an axis perpendicular to the plane ( 3 ), on which the circular saw blade ( 2 ) is clamped with an electric drive unit ( 4 ), which the axis ( 3 ), with an electrical control unit ( 5 ) for receiving signals from a detection unit ( 6 ), which breakthroughs ( 7 ) in the circular saw blade ( 2 ) and for recording a speed of the axis ( 3 ) signal proportional to these and for processing these signals into an output signal, as well as with respect to the sheet plane an upper and a lower roller frame ( 8th . 9 ), which is an upper or lower work roll ( 10 . 11 ), which forms to form a clamped circular saw blade ( 2 ) freewheel freewheel cleft ( 12 ), wherein both roll racks ( 8th . 9 ) by an external force transmitter ( 13 ) are movable relative to each other, wherein the force transmitter ( 13 ) the upper or lower roller frame ( 8th . 9 ) and a force via a spindle ( 14 ) and a lever system ( 15 ) on the upper or lower work roll ( 10 . 11 ), so that the work rolls ( 10 . 11 ) Pressure on the circular saw blade ( 2 ), characterized in that the external force transmitter ( 13 ) of a first electric motor ( 16 ) is formed and a second electric motor ( 17 ) then by the output signal of the control unit ( 5 ) is activated when a detected breakthrough ( 7 ) the pressure zone of the work rolls ( 10 . 11 ), wherein the second electric motor ( 17 ) at one point on the lever system ( 15 ), which has a shorter lever arm than the location of the lever system ( 15 ), at which the transmitting force of the first electric motor ( 16 ) and counteracts the prevailing working pressure such that the work rolls ( 10 . 11 ) abruptly take a distance to each other, which is greater than or at most equal to the size of the freewheeling gap ( 12 ). Contraption ( 1 ) according to claim 1, characterized in that the second electric motor ( 17 ) without own lever arm at the pivot point ( 18 ) of the lever system ( 15 ) attacks. Contraption ( 1 ) according to one of claims 1 to 2, characterized in that the work rolls ( 10 . 11 ) at equal distances from the central axis of the circular saw blade ( 2 ) and the detection unit ( 6 ) is spaced from the central axis according to these distances and by a certain angle α, - measured against the direction of rotation of the axis ( 3 ) - to the work rolls ( 10 . 11 ) is offset. Contraption ( 1 ) according to one of claims 1 to 3, characterized in that the detection unit ( 6 ) is a light barrier, which consists of a above the circular saw blade plane arranged light source ( 19 ) and a detector arranged below the saw blade plane ( 20 ) consists. Contraption ( 1 ) according to claim (4), characterized in that the light source ( 19 ) is a laser beam. Contraption ( 1 ) according to one of claims 1 to 5, characterized in that the electric drive unit ( 4 ) of the axis ( 3 ) is active only when the second electric motor ( 17 ) is activated and that the circular saw blade ( 2 ) with inactive electric drive of the axle ( 3 ) is transported only by the roller pressure. Contraption ( 1 ) according to one of claims 1 to 6, characterized in that the axis ( 3 ) together with the clamped circular saw blade ( 2 ) is mounted so displaceable that the circular saw blade ( 2 ) between the work rolls ( 10 . 11 ) is deliverable and the feed movement via an electric drive ( 21 ) he follows. Contraption ( 1 ) according to claim 7, characterized in that the electric drive ( 21 ) of the delivery is a servo linear motor. Contraption ( 1 ) according to one of claims 1 to 8, characterized in that the first electric motor ( 16 ) is a servo linear motor with spindle drive. Contraption ( 1 ) according to one of claims 1 to 9, characterized in that the second electric motor ( 17 ) is a servo linear motor. Contraption ( 1 ) according to one of claims 1 to 10, characterized in that the electric drive unit ( 4 ) of the axis ( 3 ) is a servomotor. Contraption ( 1 ) according to one of claims 1 to 11, characterized in that pressure sensors on the lever system ( 15 ) are mounted and with the control of the responsible for the working pressure electric motor 16 are coupled.