DE19818491A1 - Ultra filtration of coolant for grinders - Google Patents

Abstract

Ultra filtration for recirculating coolant for machine tools, in particular grinders, by passing it through a separator using rare earths, an amorphous filter and a cloth filter in series.An automatic filter cleaning station is claimed separately.

Description

This invention relates to a cleaning device for Clean a working fluid that is a job a machine tool for cooling and lubricating the area is supplied, and also an automatic filter wash direction for automatic washing of a filter, the was used together with the cleaning system.

Until now, it was common knowledge to use an abrasive coolant a grinding part for the purposes of cooling and lubrication in the process of feeding with a grinding machine.

A coolant is charged in a tank, for example device. If a pump is driven, then the cooling fed to the grinding machine. After use the coolant is passed through a manifold into a magnet separator fed where grinding-cut chips (so-called Outlets) contained in the coolant, and be removed, and the resulting coolant will stored in the tank again, which coolant for its repeated use is in a cycle, while it's being cleaned.  

However, it is difficult to cut chips (so-called called outlets) completely by a magnetic separator remove, and a large number of those not removed Sanding chips form a mixture in the tank.

So when the coolant is fed to the grinder it becomes the grinder with extremely small Grinding cut chips are fed that are not removed can. It follows that the finishing is accurate is adversely affected by workpieces.

Incidentally, there was previously a method of use a porous structure made of diatomaceous earth to filter out Known dirt particles, a method of using a single amorphous filter or an amorphous filter and a mesh filter in combination to remove dirt particles etc. to remove, and so on, as a cleaning process known from working fluid.

In the process, however, that is made of a porous structure Diatomaceous earth is used to filter out dirt particles delivered a high filter accuracy, but the system, that uses this method becomes more extensive, which leads to high costs and a high workload wall and high cost required to maintain the system (e.g. backwashing and replacing a disposable film ters).

In the process of using a single amorphous Filters for removing dirt particles can be particles removed with a size of 50 microns or more, but the most dirt particles with a size of less than 50 µm penetrate the filter and cannot be removed and the filter must be rinsed out frequently (e.g. every half a month).  

When using an amorphous filter and a mesh filter in combination to remove Dirt particles can be particles with a size of 30 µm or more are removed, but the filters need to be removed frequently be washed out (for example every half a month).

An amorphous filter is set up for this purpose, for example tet, magnetic particles from chips, dirt, etc. through the magnetic force of an amorphous metal like fine fiber adsorb and remove materials. If that fiber ge, amorphous metal is removed from a magnetic field, ge if it reaches a demagnetization state, it can can be easily washed out and used repeatedly become. However, since the amorphous filter is mostly handmade washing out is an unpleasant job with dirt and considerable work inevitable.

In addition, for example in a toolmaker machine such as a gear grinding machine, a cooling or water-soluble coolant of a job (Grinding point) for cooling and lubricating the point leads. Because the coolant is in a closed circuit for Repeated use is pumped around, have foreign bodies from chips, dirt etc. contained in the coolant, be removed to clean the coolant so that one Receives workpieces with high surface quality.

Then, in a conventional system as shown in Fig. 31, a centrifugal filter 390 is placed at a position in the coolant circulation, for example, for a coolant used for lubricating and cooling the grinding point of a grindstone G of a gear grinding machine 301 and a gear W is fed; the coolant, which runs down into a bed B, is passed into the centrifugal filter 390 , through which the foreign matter, such as chips, dirt, etc., contained in the coolant is separated and removed, and the coolant, which filters through the centrifugal force 390 was cleaned and was left in a tank 395, is fed by a pump 400 to a gear grinding machine 301 for lubricating and cooling the grinding point. This basic problem is also to be solved by the invention.

The degree of retention of foreign bodies by fleeing However, the power filter is small and it is impossible to Degree of cleaning of the coolant in some coolant cleaners systems that use centrifugal filters.

Incidentally, the size NAS is available as an index, which is the degree of purity (degree of contamination) of coolant indicates. The size and number of dirt particles passing through a filter will be retained by an image Ana lysis device automatically counted with a computer, and the level of pollution is shown as the NAS size that depends on the size and number of dirt particles is based. The higher the value, the higher the grief degree of efficiency.

Fig. 32 shows the NAS sizes of a coolant cleaned by a centrifugal filter in relation to the diameter ranges of dirt particles. As can be seen in the figure, the centrifugal filter cannot adequately retain foreign matter from chips, etc., and large NAS size values are shown throughout the particle diameter ranges.

In contrast, Fig. 33 shows the NAS sizes of a coolant cleaned by a diatomaceous earth filter in relation to the diameter ranges of dirt particles. As can be seen in the figure, the diatomaceous earth filter has a good degree of retention of foreign bodies compared to the centrifugal filter, and in particular can almost reliably retain foreign bodies with a particle diameter of 50 μm or more.

A system that uses the diatomaceous earth filter however, on a larger scale and leads to high costs, and there is a lot of work and high costs in the System maintenance required (e.g. through doing a backwash and replacing a throwaway filters). In addition, a fault easily finds in one Pump for conveying a large amount of foreign objects Chips, diatomaceous earth, etc. instead.

It is therefore an object of the invention for a pre direction to clean working fluid can increase the degree of cleaning of the working fluid in order to improve the surface quality of products, and that can extend filter life.

For example, an amorphous filter is set up for this tet, magnetic particles from chips, waste, etc. by a magnetic force of the amorphous, metal-like, fine fiber absorb and remove material. If that fiber like amorphous metal is removed from a magnetic field, if it reaches a demagnetization state, it can can be easily rinsed out and used repeatedly become. However, since the amorphous filter is almost entirely in Washing out manual labor is an unpleasant job with dirt and a lot of work inevitable.

In addition, there is therefore another goal of Invention for an automatic filter washing device too worries that relieve the worker of the uncomfortable work  Most dirt, and considerable labor includes.

The above-mentioned goal can be achieved by cleaning direction for working fluid can be achieved, the foreign removed body contained in a working fluid is in a closed loop channel for cooling and lubricating a work area of a tool machine rotates, and it can according to the present inven dung clean the working fluid using a separator from a rare earth, an amorphous filter and a Ma filter in order along the flow direction of the Working fluid in the circulation channel of the working fluid are arranged.

In the above-mentioned structure of the present invention advantageously a pump upstream from the amorphous Filter connected, and a pressure gauge is in the circulation channel for the working fluid between the pump and the Ma arranged filter.

In addition, in the above-mentioned structure of the invention advantageously a pump upstream from the amorphous Filters connected, and a sensor for the flow rate is in the circulation channel for the working fluid from the pump arranged to the work place of the machine tool.

Furthermore, in the above-mentioned structure of the invention partially a regulating valve for the flow rate and a sensor for the flow rate in the circulation channel for the Working fluid arranged, and the opening of the regulator valve for the flow rate is based on the Flow rate of the working fluid controlled by the Flow rate sensor was detected.  

Furthermore, in the above-mentioned structure, the present Invention advantageously a pump upstream from amorphous filter connected, and a check valve to the backward flow of working fluid from the amorphous Preventing filter to the pump is in the connecting channel of the amorphous filter and the pump arranged.

In addition, the above-mentioned goal can still be achieved by an automa filter washing device according to the present inven can be reached using a rinse tank for storing a Rinsing liquid, a sink for inserting a rinse lentil filter, cylinder for pressurizing the fil ters, which is inserted in the sink, alternately two different directions, a pump to feed the Rinsing liquid in the sink tank to the sink and a shutdown Has valve, which is arranged on a line, the returns the washing liquid in the sink to the washing tank.

Therefore, the dirt particles are made out according to the invention Chips, dirt etc. contained in the working fluid are, at first roughly by the separator from rare Soil is removed, and the remaining, dirt particles are removed moderately removed by the following amorphous filter, and then the remaining fine dirt particles become last finally removed through the mesh filter. Thus the Removed the load on the mesh filter and the mesh can NEN are fine-tuned to improve filter accuracy increase. The quality level of the working fluid can increased to for products with high surface quality to care. As a result of the decrease in the burden from Ma cushions filter settles when the stitches are fine are the mesh filter to increase the filter accuracy hardly ever, and the life of the filter can be extended become.  

If, in addition, the mesh filter according to the invention is set, the line pressure rises upstream from the Mesh filter. The pressure measuring device thus detects the rise pressure, reducing the time to replace the mesh ters can become known.

Furthermore, according to the invention, when the mesh filter is added, the flow rate of the working fluid, through the circulation channel from the pump to the job the machine tool flows off. Thus the sensor detects for the flow rate the decrease in the flow rate, whereby the time of replacing the mesh filter is known that can.

If further added the mesh filter according to the invention the flow resistance in the mesh filter increases, so that the flow rate of the working fluid decreases. Of the Flow sensor detects the fact that the Flow rate for working fluid drops, and when the Flow rate drops, the regulating valve for the flow amount opened and its opening is enlarged. The This process can be repeated at the replacement time the mesh filter to delay its life extend further.

Since also according to the invention the check valve for Prevent backward flow of the working fluid from the amorphous filter to a pump in the connecting channel of the Amorphous filter and the pump is arranged, the flows Working fluid downstream of the check valve remains, when the pump drive is adjusted, not backwards to the pump. If the pump again is started, the working fluid can at the same time be promoted when the pump is started again becomes.  

Since the work of filter washing is fully automatic the automatic filter washing device is carried out and does not require manual labor from a worker is invented accordingly, the worker continues from unpleasant work relieves the dirt and considerable manpower different.

However, it is another object of the invention for a To provide a cleaning device for a working fluid, which can increase the degree of cleaning of the working fluid, while reducing costs and filter life extended.

The above mentioned further goal can be achieved by a Reini device for removing working fluid Foreign bodies can be reached in a working fluid speed are included, which form a closed loop the channel for cooling and lubricating a job of a machine tool, and the working fluid cleans according to the present invention, being a magnet separator from rare earth, bag filter and a low rivet filter in sequence along the flow direction of the Working fluid in the circulation channel for the working fluid are arranged.

In addition, in the construction mentioned above, the inven dung advantageously a funnel at the outlet of the magnet separator from rare earth arranged, is a main pump between the magnetic separator from rare earth and the Bag filters arranged, and the suction flow amount Q2 for Ar The main pump's working fluid is set higher than the flow rate Q1 for working fluid in the Magnetic separator from rare earth enters.  

Furthermore, in the above structure of the present invention advantageously a main pump between the magnetab separators made of rare earth and bag filters arranged, and the main pump is with a float controller (Q-pot) Mistake.

Furthermore, in the above-mentioned structure, the present Invention advantageously a main pump between the Magnetic separator made of rare earth and the bag filters arranged, a sub-tank is between the deep-level filter and the machine tool, and the main pump always driven, regardless of whether the factory machine grinds a tool or not, causing the Working fluid in the main tank always from the magnetic separator that from rare earth, through the bag filters and the low level filter is cleaned.

In addition, in the above-mentioned structure, there is the invention advantageously a sub-tank between the Deep-level filter and the machine tool arranged that Inlet piping in the sub tank is on the four corners distributed near the bottom of the sub-tank, and the Exits from the four inlet pipes are parallel to the Side walls aligned in one direction of rotation.

Therefore, according to the invention, the dirt particles that are contained in the working fluid, first of all roughly removed the magnetic separator from rare earth, the ver permanent dirt particles are mediocre by the subsequent bag filter removed, and the ultimately ver permanent fine dirt particles are finally through the low-level filter removed. Thus, the burden of Deep level filter removed and its mesh can be fine be trained to increase filter accuracy.  

The degree of cleaning of the working fluid can be increased to ensure products with high surface quality.

Since no diatomaceous earth filter is used, which size and leads to high device costs, can the cleaning device for working fluid under low cost, and lifespan the filter can be extended.

The object of the present invention is based on the following schematic drawing, for example explained in more detail; in this is:

Fig. 1 is a schematic representation to show a first embodiment of a coolant circulation device of a machine tool, with a device for Ent removal of cutting chips, according to the corre sponding technique;

Fig. 2 is a schematic illustration to show the formation of a magnetic separator;

Fig. 3 is a schematic section to show the formation of a float regulator;

Fig. 4 is a schematic diagram to show a second embodiment of a coolant circulating device of a machine tool, which comprises a device for removing the cutting chips according to the corresponding technique;

Fig. 5 is a schematic section to show the formation of a cyclone separator;

Fig. 6 is a schematic illustration to show a modified example of a coolant circulating device of a machine tool, which includes a device for removing the cutting chips according to the related art;

Fig. 7 is a schematic illustration to show the construction of a device for supplying working liquid having a cleaning device according to the invention;

Fig. 8 is a diagram showing the relationship between the NAS size and the particle diameter;

Fig. 9a is an enlarged section of the tooth surface (tooth engagement surface) of a conventional gear after lapping, and Fig. 9b is an enlarged section of the tooth surface (tooth engagement surface) of a gear on which lapping is performed with a working fluid performed by the cleaning device according to the invention has been cleaned;

FIG. 10 is a schematic sectional view of an inventive SEN, automatic filter washing device;

FIG. 11 is a sectional elevation of a top ichtung Spülbec ken automatic, according to the invention Filterwaschvorr;

Fig. 12 is a schematic section to show another exemplary embodiment of the automatic filter washing device according to the invention;

Fig. 13 is a schematic section to show another exemplary embodiment of the automatic filter washing device according to the invention;

Fig. 14 is a schematic section to show another exemplary embodiment of the automatic filter washing device according to the invention;

Fig. 15 is a schematic section to another, for example from guide to show the terwaschvorrichtung Fil invention automat Sichen;

Fig. 16 is a schematic section to show another exemplary embodiment of the automatic filter washing device according to the invention;

Fig. 17 is a schematic illustration to show the training of a coolant circulating device having a coolant cleaning device according to the invention;

Fig. 18 is a schematic representation to show the training of a filter unit of the coolant cleaning device according to the invention;

FIG. 19 is a partial sectional view of a main tank;

FIG. 20 is a partial sectional view of the main tank;

FIG. 21 is a sectional view of a float regulator;

Fig. 22 is a plan view to show an example of how foreign matter floating on the coolant surface in the main tank is brought to the float regulator and the degree of retention of foreign matter is increased;

Fig. 23 is a sectional side view, a show case of game, such as float to foreign bodies, the surface on the coolant in the main tank, spends to the float regulator and increases the rejection ratio for foreign bodies.

Fig. 24 is a sectional side view to show an example of how to bring foreign matter floating on the coolant surface in the main tank to the float controller and increase the degree of retention for foreign matter;

Fig. 25 is a perspective view to show the inlet pipes in a sub tank;

Fig. 26 is a partial section of the main tank to show the structure of a diffusion tube;

Fig. 27 is a graph showing the degree of coolant purification of a rare earth magenta separator;

Fig. 28 is a graph to show the correspondence between the nip and the degree of retention in the rare earth magnetic separator with the flow rate serving as a parameter;

FIG. 29 is a diagram for the refrigerant purification rate to show through bag filter;

To the coolant purification rate to show 30 is a diagram by a low-level filter.

Fig. 31 is a schematic illustration to show the training of a conventional coolant cleaning device;

Fig. 32 is a diagram showing the refrigerant purification rate by a centrifugal filter; and

Fig. 33 is a diagram showing the refrigerant purification rate through a diatomaceous earth filter.

There now follows a detailed description of the preferred embodiments, with reference now being made to the accompanying drawings of FIGS . 1 to 6, where examples from the corresponding technique are shown.

Fig. 1 shows schematically a first embodiment of a coolant circulation device of a machine tool, with a device for removing cutting chips arising during work according to the corresponding technology. As shown here, a cooling fluid circulating device 1 (referred to simply as circulating device 1) provided with a tank 3 for Keep coolant Co. When a pump 6 is driven, the coolant Co in the tank 6 is fed to a grinding machine 2 of a machine tool via a coolant feed channel 4 (simply called feed channel 4 ). After the coolant Co has been used, it is fed back to the storage tank 3 , namely via a coolant collecting channel 5 (simply called collecting channel 5 ). The circulation device 1 is built up in this way.

The feed channel 4 is provided with a filter 7 for removing foreign matter contained in the coolant Co, and feeds the resulting coolant Co to the grinder 2 . For example, the filter 7 includes a bag made of the non-woven resin cloth and the like to filter the coolant Co to remove and retain foreign matter contained therein.

The collecting duct 5 is provided with a magnetic separator 8 in order to remove chips from the grinding process which are contained in the collected coolant Co. The magnetic separator 8 has, for example, a motor-driven magnetic roller 8 b in a container 8 a, as shown in Fig. 2 ge. The collected coolant is first stored in the container 8 a and then introduced into the tank 3 . That is, the abrasive cut chips are magnetically adsorbed on the magnetic roller surface and removed and then dropped on an inclined surface 8 c and collected in a collecting vessel 8 d. In the embodiment, the magnetic roller is made of a rare earth magnet which has a strong coercive force as compared with a conventional ferrite magnet, so that the function of removing grinding cut chips is improved.

As shown in Fig. 1, the front end of a return guide channel 9 , which is connected to the rear end of the tank 3 , is connected to the magnetic separator 8 . If a pump 10 is driven, then the coolant Co, which is stored in the tank 3 , is conveyed upstream from the magnetic separator 8 via the return duct 9 .

A part, which is called a float regulator (Q-pot) 11 and forms an inlet for coolant Co, is attached to the rear end of the return duct 9 . As shown in Fig. 3, the float regulator 11 has a cylindrical input member 13 made of foamed resin which is inserted into the rear end of the return passage 9 , and the input member 13 is attached to an attachment member 12 at the end of the return passage accordion-like elastic part 14 is attached, which is attached to the outer circumference of the input part 13 . A suitable amount of coolant Co is accommodated in the float regulator 11 . If the pump 10 is driven, then the coolant Co is sucked off in the float regulator 11 through an insertion hole 9 a, which is formed in the return channel 9 , the input part 13 is caused by the suction force (indicated by the broken line in Fig. 3rd ) fall down, and the coolant Co is introduced into the input part via notches 13 a, which are formed in the edges thereof, whereby the coolant Co mainly in the surface portion of the coolant Co, which is stored in the tank 3 , in the magnetic separator 8 via the return channel 9 is initiated. On the other hand, if the pump 10 stops, the input part 13 is caused to rise by its buoyancy, and the notches 13 a are arranged above the liquid level of the coolant Co, whereby the introduction of the coolant Co in the float regulator 11 is blocked. This means that the float regulator 11 and the return duct 9 form countercurrent feed means.

When the pump 6 is driven in the circulation device 1 thus formed, the coolant Co is pumped upward from the tank 3 , and foreign bodies contained in the coolant Co are removed by the filter 7 , where the coolant Co of the grinding machine 2 is fed. After the coolant Co has been used, it is fed via the collecting duct 5 into the magnetic separator 8 , where grinding cut chips which have been supplied to the coolant Co in the grinding machine 2 are adsorbed and removed, and the coolant Co becomes the tank 3 Storage returned, whereby the coolant Co is supplied to the grinding machine 2 while it is being cleaned.

While the coolant Co is thus circulated and fed to, the pump 10 for supplying the coolant Co in the tank 3 in the magnetic separator 8 via the return channel 9 is operated so that the grinding cut chips are not completely in the process of returning the coolant Co to the tank 3 were removed and fed into the tank 3 , can be removed and retained in the magnetic separator 8 .

Thus, according to the circulation device 1, the coolant Co, which is stored in the tank 3, is conveyed via the return duct 9 into the magnetic separator 8 for removing the grinding cut chips that were contained in the stored coolant Co, so that the proportion of grinding cut chips in the stored coolant Co is effective can be reduced. Therefore, the purity of the coolant Co supplied to the grinder 2 can be effectively improved, and a problem of adversely affecting the finishing accuracy of workpieces due to the high proportion of cutting chips as in the conventional device can be effectively suppressed. In particular, grinding cut chips in stored coolant often mix with oil, etc., and float on the surface of the stored coolant. According to the design of the circulation device 1 , however, the coolant Co is fed mainly in the surface area of the coolant by means of Co, which is stored in the tank, into the magnetic separator of FIG. 8 via the return channel 9 in such a way that the grinding cut chips in the stored coolant are conveyed into the magnetic separator 8 and are extremely effectively removed and retained therein.

According to the circulating device 1 , the amount of grinding cut chips in the stored coolant Co can be effectively reduced as described above, so that the amount of grinding cut chips that are filtered by the filter 7 is reduced. Therefore, the maintenance cycle of the filter arranged on the feed channel can be extended compared to that in the conventional device.

Next, a second embodiment of a machine tool coolant circulation device having a work cut chip removing device according to the related art will be discussed with reference to FIG. 4. Parts that are identical to or similar to those previously described with reference to FIGS. 1 through 3 are designated by the same reference numerals in FIG. 4 and will not be discussed again. Only the difference between these is discussed in detail.

As shown in Fig. 4, in a circulation device 20 of the second embodiment, a tank 3 is divided into a main tank 3 a and a sub tank 3 b by a partition, the rear end of a feed channel 4 is connected to the main tank 3 a and the front end a collecting channel 5 is connected to the sub-tank 3 b, and the coolant tel Co in the sub-tank 3 b is fed via a return channel 9 to a magnetic separator 8 .

The sub-tank 3 b is provided with a subdivision vessel 26 which has an opening at the top and on the underside with the inside of the sub-tank 3 b in connection, more specifically in connection with a part which is noticeably lower than the liquid level of the coolant Co in the sub tank 3 b (the depth at which grinding cut chips are present in a relatively small amount). The rear end of a secondary return duct 21 for pumping up the coolant Co by driving a pump 25 is inserted into the partitioning vessel 26 , and the front end of the secondary return duct 21 is connected to the input 22 a of a cyclone separator 22 . The outlet 22 b of the cyclone separator 22 is connected to the main tank 3 a via a connecting channel 24 , and the retaining side 22 c of the cyclone separator 22 is connected to the magnetic separator 8 . As shown in Fig. 5, in the cyclone separator 22, a fluid into the inlet 22 a is fed, whereby it produces a rotational flow in the Zy klonabscheider 22, and while the fluid from the output 22 b is discharged by centrifugal force, impurities contained, namely abrasive cut chips, etc. separated, and given off on the collecting side 22 c.

In the circulation device 20 of the second embodiment, which is designed in this way, the cooling medium Co is basically circulated between the tank 3 and the grinding machine 2 via the feed channel 4 and the collecting channel 5 . In the circulation device 20 , the coolant Co, which has been collected by the grinding machine 2 , is first entered into the subdivision vessel 26 and is entered via the secondary return channel 21 into the cyclone separator 22 , where grinding chips are separated, and the coolant Co, from which the abrasive cut chips were separated, is delivered to the main tank 3 a via the connecting channel 24 , and the separated abrasive cut chips are delivered to the Magnetab 8 separator.

In the tank 3 , the coolant Co, which was introduced into the main tank 3 a via the connecting channel 24 , as described above, overflows into the secondary tank 3 b. In the sub tank 3 b, the coolant Co, which was mainly in the surface portion of the coolant Co, which is housed in the sub tank 3 b, is input into the magnetic separator 8 via the return passage 9 , as in the circulation device 1 described above.

That is, according to the circulation device 20 , the abrasive cut chips contained in the collected coolant are first removed from the cyclone separator 22 . The grinding chips, which were not removed from the cyclone separator 22 and were introduced into the main tank 3 a, are moved to the auxiliary tank 3 b in association with the overflow from the main tank 3 a and are introduced into the magnetic separator 8 via the return channel 9 .

The circulation device 20 can also reduce the content of grinding cut chips in the stored coolant Co in the main tank 3 c. Therefore, it can effectively promote the purity of the coolant Co to be supplied to the grinder 2 more than in the circulating device 1 of the first embodiment, and therefore becomes advantageous in cases where abrasive cutting chips are accumulated in large amounts.

The circulating devices 1 and 20 are typical examples of circulating devices from the associated technology, which includes devices for removing work cut chips, and the combination and arrangement of parts can be used without departing from the idea of the assigned technology.

For example, the circulating device 20 of the second circulating form uses the cyclone separator 22 as a separating means for separating grinding cut chips contained in the cooling medium Co which is sucked up from the dividing vessel 26 and directs the separated grinding chips into the magnetic separator 8 , but it can of course also any other separator can be used. Incidentally, the cyclone separator 22 has the advantage of eliminating the need for maintenance and replacement of a non-woven cloth used as a filter.

In the circulation device 20 of the second embodiment, the cyclone separator 22 , the connecting channel 24 and the subdivision vessel 26 can be omitted and the coolant Co in the secondary tank 3 b can be passed directly into the main tank 3 a via the secondary return channel 21 . In this case, most of the abrasive cut chips contained float on the surface portion of the coolant Co, as described above, and thus the coolant Co is preferably sucked in from the depth, in which abrasive cut chips only a relatively small amount in the coolant Co in the secondary tank 3 b in the Training of the second embodiment are present. The collected coolant Co can be released directly into the main tank 3 a from the magnetic separator 8 . In each example, while the grinding cut chips are collected in the secondary tank 3 b when the coolant Co overflows from the main tank 3 a, the coolant Co in the magnetic separator 8 can be introduced via the return channel 9 , so that the grinding cut chips in the coolant Co in one a simple training can be removed, although the accuracy is somewhat worse than that of the circulation device 20 .

Furthermore, a filter unit 30 , as shown for example in FIG. 6, can be used instead of the filter 7 . FIG. 6 shows an example in which the filter unit 30 is applied to the circulation device 20 of the second embodiment.

That is, while the coolant Co, which is conveyed from the tank 3 to the grinder 2 , is first housed in a first intermediate tank 33 through a first filter 31 with coarse mesh, it is caused to pass into the main gear 3 a of the tank 3 to overflow the intermediate tank 33 . The coolant Co is pumped out of the first intermediate tank 33 by operating a pump 35 and is passed through a second filter 32 , which has finer meshes than the first filter 31 , and is then accommodated in a second intermediate tank 34 . In the meantime, the coolant Co is pumped out of the second intermediate tank 34 by operating a pump 36 and is fed to the grinding machine 2 . According to this configuration, a coolant Co with higher purity than that in the circulation device 20 of the second embodiment can be supplied; the training is useful when high accuracy is required, for example for the supply of coolant Co at high pressure. In the embodiment, the coolant Co in the main tank 3 a is fed directly to the grinder 2 via the feed channel 39 by operating a pump 38 (which is indicated, for example, in the dash-dotted box in FIG. 6), and whether the coolant Co is through the filter unit 30 fed through or not, can be determined depending on the required finishing accuracy of the object to be ground.

In the example in Fig. 4 and Fig. 6, the coolant Co, which is sucked from the subdivision vessel 26 is conveyed through the bypass return channel 21 to the cyclone separator 22, but the partitioning vessel may be omitted, and the coolant Co b may be sucked from the sub tank 3 immediately 26 and conveyed into the cyclone separator 22 . In an alternative solution, the cyclone separator 22 can be provided in the device of FIG. 1, and a secondary return flow channel and a pump can be arranged so that they convey the coolant Co, which has been sucked up from the tank 3 , to the cyclone separator 22 .

As described above, the corresponding Tech nik in the device in which the coolant, the stored in the tank for use with the machine tool is in circulation, the coolant in the tool conveyed through filter-like separators, then are the cutting chips that are contained in the coolant are removed in the magnetic separator and the resulting Coolant is collected in the tank. In addition to such an order  run of coolant for use in the machine tool the coolant in the tank is fed into the magnetic separator changed and kept in the tank again. Thus, working Cutting chips in the process of returning the coolant Co from the machine tool to the tank is not completely ent were removed and put back into the tank, be removed effectively. Therefore, the purity of the cooling means that is fed to the machine tool, effective be improved and a problem of adverse leg flow due to the finishing accuracy of the workpiece the high proportion of cut chips, as in the conventional device, can be effectively suppressed.

In particular, are in training when the tank is made up of a main tank and a secondary tank in order to Store coolant that overflows from the main tank, and while the coolant from the main tank out of the tool machine is fed, the countercurrent funding set up, the coolant in the secondary tank the Magnetab to feed the separator, with the cutting cuttings that are in the Coolants are included, effectively collected in the sub tank and entered into the magnetic separator so that the Work cut chips contained in the coolant in the main tank are effectively reduced. Thus, the purity of the Coolant that is fed into the machine tool promoted even more effectively.

If the device for removing work cut chips still further feed to the cooling medium that has passed through the magnetic separator, to convey to the main tank and if the feed means are provided with a separator to cut chips to separate from the coolant, then the content of Effective cutting chips in the coolant in the main tank be reduced. Especially when a cyclone separator  used as a separator to work the deposited inserting cutting chips into the magnetic separator, the Easy to set up and also can work removed cutting chips retained by the magnetic separator overall be so that the device for removing work cutting chips from the point of view of removing the work cutting chips, etc. is appropriate.

If also the sub-tank with a subdivision vessel is provided, which is stored in the coolant is closed, the coolant through the magnetic separator that has passed through, collected in the subdivision vessel is, and the feed means the coolant from the Suction subdivision vessel, then the working cut Chips collected in the subdivision vessel and effectively removed become.

The cutting chips often mix with oil, etc. and float on the surface of the stored coolant, as described above. If therefore countercurrent feed medium the coolant mainly in the surface section the coolant that is stored in the tank, and that Enter the extracted coolant in the magnetic separator, the cutting chips can act in the coolant be removed more samer.

It will now refer to the accompanying drawings 7-16 referenced where preferred embodiments of the present ing invention are shown.

Fig. 7 is a schematic illustration to show the formation of a working fluid supply device having a cleaning device according to the invention. This working fluid supply device delivers a working fluid to a gear W of a workpiece and to an SV cutter C of a working portion of a gear lapping machine, a machine tool for performing the finish on the tooth surface of the gear W. The working fluid used for cooling and lubricating the SV-cutter C and the gear W in the working section is fed, and dropped chips, deposited dirt, etc. is constantly circulated at a table T in a channel that forms a closed loop while being cleaned by a cleaning device according to the Invention is cleaned.

Otherwise, the working fluid cleaning device according to the invention has a separator 101 made of rare earth, an amorphous filter 102 and a mesh filter 103 , which are arranged in sequence along the flow direction of the working fluid.

The rare earth separator 101 is arranged to collect magnetic particles of chips etc. in a size of 100 µm or more by the magnetic force of a magnetic roller 104 and to collect the magnetic particles in a collecting vessel 105 . It is located between the working section of the gear lapping machine and a tank 106 , and two manifolds a and b extend down from the table T and are open from the rare earth separator 101 .

The amorphous filter 102 is provided to pick up and remove magnetic particles of chips, dirt, etc., 50 µm or more in size by the magnetic force of an amorphous metal such as fine fibers. When the fibrous, amorphous metal is removed from a magnetic field, it becomes demagnetized and can thus be easily washed out and used repeatedly.

Further, the mesh filter 3 , which is a filter that uses a woven or non-woven cloth, can block the passage of dirt particles of chips, dirt, etc. with a size of 30 µm or more, and collect and remove the dirt particles.

The working fluid collected in the tank 106 is pumped by pumps 109 and 110 to the working section of the gear wheel lapping machine. That is, the working fluid speed, which is pumped by a pump 109 , the Ar beitsstelle of the SV-cutter C is supplied for cooling and lubrication of the point, and the working fluid, which is pumped by the other pump 110 , is left on the table T flow to clean the table T from falling chips, never knocked down dirt, etc.

The working fluid, which was supplied for cooling and lubricating the SV cutter C and the gear W and for cleaning the table T, is conveyed from the table T through the collecting lines a and b to a separator 101 made of rare earth, where magnetic particles come from Chips, dirt, etc. with a size of 100 μm or more, which are contained in the working fluid, are retained by a magnetic force of the magnetic roller 104 and are collected in the collecting vessel 105 . The working liquid from which the chips, etc., 100 µm or more in size has been removed, runs down into the tank 106 to be collected there. 97 percent (97%) of the magnetic particles contained in the working fluid are collected and removed by the rare earth separator 101 , and the NAS size of the magnetic particles still contained in the working fluid is around one or two lowered from separator 101 from rare earth. The NAS size refers to a size that is displayed as a result of an automatic count of the size and number of dirt particles that have been collected by a filter, by means of image analysis with a computer.

The working fluid from which the magnetic particles from the chips, dirt, etc., in the size of 100 µm or more have been removed from the rare earth separator 101 and which is collected in the tank 106 as described above is supplied by the pump 110 pumped up and is caused ver to flow in a line c to the table T through a nozzle 111 for washing away chips, dirt, etc., which fell on the table T by carrying out the finishing on the gear W by the SV milling cutter are and were deposited there.

On the other hand, the working fluid that has been pumped up by the pump 109 flows through a line d and is passed into an amorphous filter 102 from the bottom thereof. At points on line d, a check valve 112 for preventing backward flow of the working fluid from the amorphous filter 102 to the pump 109 , a flow rate regulating valve 113 for regulating the flow amount of the working liquid, a normally open valve 114 and a pressure gauge 115 are arranged . A manifold e branches from a point on the line d, and a normally closed valve or working valve 116 is arranged at a point on the manifold e.

The working liquid, which has been introduced into the amorphous filter 102 from the bottom thereof, has magnetic particles of chips, dirt, etc., with a size of 50 µm or more, which are adsorbed and removed by the magnetic force of the fibrous, amorphous metal , as described above, then flowed out from the top of the amorphous filter 102 and is introduced through a line f into a mesh filter 103 from the top thereof. The NAS size of the magnetic particles contained in the working fluid is reduced by the amorphous filter 102 by one to three.

Incidentally, a pressure gauge 117 and a Ruhven valve 118 are arranged at points of line f which connect the amorphous filter 102 and the mesh filter 103 , a collecting line g branches off from line f, and a working valve 119 is at a point in the Bus line g arranged.

The working liquid which is introduced into the mesh filter 103 through the line f as described above is passed through the mesh filter 103 made of woven or non-woven cloth, whereby chips of dirt, dirt, etc. with a size of 30 µm or more are removed are removed and the NAS size of the dirt particles contained in the working fluid is reduced to one or two.

The working fluid, in which the dirt particles are removed through the mesh filter 103 , flows out of the underside of the mesh filter 103 and is supplied through a line h to the gear W and the SV cutter C of the working section of the gear lapping machine for cooling and lubrication thereof. The working fluid that is supplied for cooling and lubricating the SV cutter C and the gear W and contains the chips etc. and the working fluid that is supplied for cleaning the table T and contains chips etc. are in the separator 101 introduced from rare earth through the manifolds a and b from table T, as described above. Thereafter, the working liquid is cleaned by the purification composed of the rare earth separator 101 , the amorphous filter 102 and the mesh filter 103 , and is circulated through the channel forming the closed loop to repeatedly repeat the SV- Cool and lubricate cutter C and gear W and clean table T as described above.

Incidentally, a pressure gauge 120 and a working valve 121 are arranged at points near the mesh filter 103 on the line h, a manifold i branches, and a rest valve 120 is arranged at a point on the manifold i. A flow amount sensor 123 for the flow amount of the working liquid flowing through the line h is arranged at a point near the gear lapping machine on the line h. A detection signal of the flow rate sensor 123 is input to a controller 124 which controls the opening of the flow control valve 113 based on the signal for regulating the flow rate of the working liquid.

The line h upstream of the flow rate sensor 123 and the part of the line d between the flow control valve 113 and the working valve 114 are connected by a bypass line j, and a rest valve 125 is arranged at a point in the surrounding line j.

In the embodiment, the rare earth separator 101 , the amorphous filter 102, and the mesh filter 103 are sequentially installed along the flow direction of the working liquid to form the working liquid cleaning device, and the collected working liquid is separated by the separator 101 Earth, the amorphous filter 102 and the mesh filter 103 passed through in order. Thus, most of the dirt particles from chips, dirt, etc. contained in the working fluid (about 97%) are first roughly removed from the rare earth separator 101 , and then the dirt particles become moderately amorphous by the following Filter 2 is removed, and then the ultimately remaining fine dirt particles are ultimately removed in a very small amount through the mesh filter 103 . Thus, the mesh filter 103 is relieved, the mesh can be made fine to increase the filter accuracy, and the NAS size of the dirt particles contained in the working fluid can be drastically reduced compared to that in a conventional device Quality improvement (see Fig. 8). As a result, the quality level of the working fluid can be remarkably increased, and the gear W, the product, can be provided with a high surface quality.

Fig. 9a is an enlarged section of the tooth surface (tooth race) of a conventional gear after lapping machining and Fig. 9b is an enlarged section of the tooth surface (tooth race) of a gear in which the lapping is carried out with a working fluid by the cleaning device according to the invention was cleaned. When comparing Fig. 9a and Fig. 9b, it will be understood that an extremely high Zahnoberflächenge accuracy can be provided if the lapping is performed with a working fluid that has been cleaned by the cleaning device according to the invention.

As a result of the relief of the mesh filter 103 as described above, if the meshes are fine to increase the filter accuracy, the mesh filter 103 hardly clogs, and therefore the life of the mesh filter 103 is prolonged.

Incidentally, when the mesh filter 103 is clogged, the flow resistance in the mesh filter 103 increases, and thus the flow amount of the working liquid decreases. When the flow rate sensor 123 determines that the flow rate of the working fluid is decreasing and when a signal from the flow rate sensor 123 is input to the controller 124 , the controller 124 opens the flow control valve 113 and increases its opening to increase for a predetermined flow rate to care. This operation can be repeated to delay the timing of replacing the mesh filter 103 to further extend its life.

When the mesh filter 103 is clogged, the pressure of the line f upstream of the mesh filter 103 increases . Thus, the pressure gauge 117 detects the pressure rise, whereby the time can be known at which the Ma filter 103 must be replaced. To replace the amorphous filter 102 or the mesh filter 103 , the Ar beitsventile 114 and 121 are closed and the rest valve 125 is opened, causing the working fluid to flow into the bypass line j, which bypasses the amorphous filter 102 and the mesh filter 103 .

When the mesh filter 103 is clogged, the flow amount of the working fluid, which flows through the circulation channel from the pump 109 to the work station of the machine tool, decreases. Thus, the flow meter sensor 123 detects the decrease in the flow amount, whereby the timing for replacing the mesh filter 103 can also be known.

Further, in the embodiment, since the line d is provided with the check valve 112 , when the drive of the pump 109 is stopped, the working fluid that remains downstream of the check valve 112 does not flow backward to the pump 109 or the tank 106 and is left untouched . Thus, when the pump 109 is started again, the working fluid is supplied to the working section at the same time as the pump 109 is started again.

Next, the configuration of the automatic filter washing device according to the invention with reference to FIG. 10 and FIG. Discussed. 11 Fig. 10 is a schematic section of the automatic filter washing device according to the invention and Fig. 11 is a sectional plan view of a sink of the automatic filter washing device.

The automatic filter washing device according to the embodiment is a device for automatically washing the amorphous filter 102 . It comprises a rinse tank 126 for storing a rinsing liquid, a sink 127 for inserting the amorphous filter 102 to be washed, four cylinders 128 , 129 , 130 and 131 to alternate against the amorphous filter 102 which is inserted in the sink 127 Press two different directions, a pump 132 for supplying the washing liquid in the washing tank 126 via a feed line m to the sink 127 , an electromagnetic solenoid valve 133 , which is arranged on a drain line n, which returns the washing liquid in the sink 127 back to the washing tank 126 , and a separator 101 made of rare earth. The sink 127 contains a float switch 134 in order to keep the liquid level of the washing liquid in the sink 127 constant.

In the embodiment, the tank 106 and the working liquid are used as the sink 127 and the washing liquid, respectively, and the rare earth separator used with the cleaning device described above is also used as the rare earth separator 101 . In the embodiment, the float switch 134 in particular is used as a liquid level sensor to keep the liquid level of the rinse liquid in the sink 127 constant, but any other sensor such as an ultrasonic sensor can be used in an alternative solution.

The automatic filter washing device having this configuration is used to wash the amorphous filter 102 as follows:

First, the amorphous filter 102 is inserted into the Spülbec ken 127 , the pump 132 is driven, and the washing liquid in the washing tank 126 is pumped up and supplied to the sink 127 via the feed line m. When a certain amount of the rinsing liquid is supplied to the sink 127 , the float switch 134 detects it and adjusts the pump drive 132 . At this time, the solenoid valve 133 is closed.

In the state, two pairs of cylinders 128 , 129 , 130 and 131 , which are opposed to each other, are driven alternately to move their rods forward and backward in a predetermined number of cycles from two directions perpendicular to each other to compress the amorphous filter 102 and wash, which is set in the sink 127 , whereby the dirt particles are removed from chips, dirt, etc., which have never hit the amorphous filter 102 to wash it out. Thereafter, the solenoid valve 133 is opened to introduce the washing liquid through the drain line n into the rare earth separator 101 where the dirt particles are removed from chips, dirt, etc. contained in the washing liquid, and then the washing liquid becomes again Rinsing basin 127 collected. After a predetermined period of time has passed, the solenoid valve 133 is closed and the pump 132 is restarted. The process is repeated several times.

Then the amorphous filter 102 is automatically washed out and can be used again. Since the washing process is carried out fully automatically and does not require manual labor by a worker, the worker is relieved of unpleasant work which entails dirt and a considerable amount of work.

Fig. 12 to Fig. 16 show various embodiments, in which the automatic filter washing device is designed as an independent device.

Fig. 12 shows an example in which the automatic filter washing device is composed of the washing tank 126 , the sink 127 , the pump 132 , the solenoid valve 133 and cylinders (not shown), which are basic components. FIG. 13 shows an example in which partition plates 135 and 136 separate the inside of the washing tank 126 to contain floating and settled sludge in the automatic filter washing device shown in FIG. 12.

FIG. 14 shows an example in which the rare earth separator 101 is added to the automatic filter washing device shown in FIG. 12. FIG. 15 shows an example in which the rare earth separator 101 is added to the automatic filter washing device shown in FIG. 13.

Furthermore, FIG. 16 shows an example in which, in the automatic filter washing device shown in FIG. 14, air or a rinsing liquid is injected through a line k into the rinsing liquid in the rinsing tank 126 in order to stir it to prevent sludge from doing so to settle in the rinse tank 126 , and the pump 137 is driven to collect floating sludge and settled sludge in the wash tank 126 in the separator 101 from rare earth from the line s forth.

Reference is now made to the accompanying drawings of Figs. 17-30; other preferred embodiments of the invention are shown therein.

Fig. 17 is a schematic diagram to show the formation of a coolant circulation device having a coolant cleaning device according to the invention. Fig. 18 is a schematic diagram to show the formation of a filter unit of the coolant cleaning device.

The coolant circulating device according to the embodiment repeats the process of supplying a coolant to a gear W forming a workpiece and to a grindstone G in the grinding portion of a gear grinding machine 201 to carry out grinding and finishing of the tread of the gear W in order to cool and lubricate the grinding section and to drop it on a bed B, remove cotton-like grinding cut chips, deposited dirt, etc. by cleaning, and the process of cleaning the coolant by a coolant cleaning device according to the invention, by constant circulation of the coolant in a channel that forms a closed loop ge.

Otherwise, a rare earth separator 202 , which forms part of the coolant cleaning device according to the invention, is arranged downstream of the gear grinding machine 201 in the coolant flow direction and at a location which is lower than the gear grinding machine 201 , a main tank 203 is under the separator 202 arranged from rare earth, and a sub-tank 205 with an oil cooler 204 is placed near the main tank 203 .

Two pipes 206 and 207 extend from the bottom of the main tank 203 . One pipe 206 is open at one end above a bed B of the gear grinding machine 201 , and the other pipe 207 is connected to a filter unit 208 , which forms part of the coolant cleaning device according to the invention. At locations in the pipe 206 , an on-off valve or switching valve 209 , a bed irrigation pump 210 , a check valve 211 , a pressure measuring device 212 , a regulating valve 213 for the flow rate and a switching valve 214 are arranged in sequence along the coolant flow direction. A spray nozzle 216 is attached to one end of a tube res 215 that branches from a location in the tube 206 , and a switching valve 217 is located at one location in the tube 215 . At points in the tube 207 , a switching valve 218 , a main pump 219 , a check valve 220 , a pressure gauge 221 and a regulating valve 222 for the flow amount in the coolant flow direction are arranged in order.

Moreover, the main tank 203 includes a float regulator 223 for removing foreign bodies from grinding dust, etc., which float on the surface of the coolant, which is kept in the main tank 203 and a suction tube 224, which proceeds from the float controller 223 is, on the bed B the gear grinding machine 201 open. A pump 225 for the float regulator, a switching valve 226 , a starting funnel 227 for the starting process and a regulating valve 228 for the flow quantity are arranged at points in the suction pipe 224 .

The configuration of the filter unit 208 will be described in detail with reference to FIG. 18.

The filter unit 208 has three bag filters 229 , which are connected in parallel to the tube 207 , and a Tiefniveaufil ter 230 , which is connected downstream of the bag filters (downstream in the coolant flow direction). A tube 231 , which extends from the central, lower end of each bag filter 229 , is connected at one point in a tube 234 that connects a tube 232 and a drain tube 233 , and the tube 232 is connected to the inlet of the Low-level filter 230 connected. A Druckmeßge advises 235 , a pressure sensor 236 and a switching valve (on-off valve) 237 are arranged at locations in the tube 332 .

A tube 238 for supplying factory air (ambient air) is connected to the top of each bag filter 229 , and a switching valve 239 , an outlet 240 and a de-oiling valve 241 are arranged at locations in the tube 238 .

On the other hand, a pipe 242 , which comes from the outlet of the deep level filter 230 , is connected to the sub tank 205 , and a switching valve 243 , a pressure gauge 244 and a pressure sensor 245 are arranged at locations in the pipe 242 . The tubes 207 and 242 are connected by a bypass tube 246 , and a bypass valve 248 is located at one location in the bypass tube 246 . The tubes 232 and 242 are connected by a bypass tube 247 , and a bypass valve 249 is located at one location in the bypass tube 247 .

A drain pipe 250 , which goes from the deep level filter 230 , is connected to the main tank 203 , and a switching valve 251 is arranged at one point in the drain pipe 250 (see FIG. 17). An air discharge pipe 252 , which starts from the low-level filter 230 , is connected to the magnetic separator 202 from rare earth, and a switching valve 253 is arranged in one place in the air discharge pipe 252 .

Furthermore, a diffusion tube 254 , which is open above the main tank 202 , is attached to the end of the drain pipe 233 , and a switching valve 255 is arranged at one point in the drain pipe 233 .

Incidentally, as shown in Fig. 17, a pipe 256 , which extends from the lower end center of the main tank 205, is open above the grinding point of the grindstone G of the gear grinding machine 201 and the gear W and is in place in the pipe 256 Switch valve 257 , an auxiliary pump 258 , a check valve 259 , a pressure measuring device 260 , a regulating valve 261 for the flow rate and a pressure measuring device 262 are arranged in order in the coolant flow direction.

The sub tank 205 includes a paddle vane 263 and a lower error level 264 end sensor, and an overflow hose 265 extending from the top of the sub tank 205 is open above the main tank 203 .

The coolant cleaning device according to the invention comprises a rare earth magnetic separator 202 , bag filter 229 and the deep level filter 230 , which are arranged in the coolant flow direction. The rare earth magnetic separator 202 , the bag filter 229 and the low level filter 230 are generally discussed.

The rare earth magnetic separator 202 retains and collects magnetic particles of abrasive chips, etc., 100 µm or more in size by the magnetic force of a magnetic roller 270 rotated by a motor (not shown), and collects them (see Fig. 17).

Each bag filter 229 is a bag-shaped filter made of a non-woven or woven cloth made of synthetic fibers. A smaller number of bag filters with coarse mesh sizes should, if possible, be provided in the area in which no long-fibrous chips are produced. In this embodiment, three bag filters 229 with 40 µm mesh are used.

Furthermore, the deep level filter 230 is a filter made like a lamination from non-woven or woven fabric made of synthetic fibers, with coarse outer layers and a fine inner layer. Therefore, large grinding cut chips etc. collect between the filter and an outer cylinder, and if the filter is simply pulled out, foreign matter from chips etc. cannot be removed. However, fine chips and such particles enter the position of the filter, so that, unlike the bag filter 229 , the deep level filter 230 does not require a large, bag-like volume and can be made compact in size overall, with a large number of cylinders are arranged with a small diameter to provide a large area. It has been experimentally determined that 15 µm filter meshes are required to provide a level of cleaning in the deep level filter 230 that is as high as the level of cleaning of a diatomaceous earth filter.

Next, the construction of the main tank 203 with reference to FIG. 19 to be discussed Fig. 21. Fig. 19 and Fig. 20 are partial sectional views of the main tank 203, and FIG. 21 is a sectional view of the float regulator 223rd

As shown in Fig. 19, in the main tank 203, an upper hopper 275 attached to the rare earth magnetic separator 202 is open at the bottom, and a lower hopper 276 which is open at the top is under the upper hopper 275 and am Bottom of the main tank 203 arranged.

The tube 207 (see FIG. 17) is connected to an opening formed in the side of the lower funnel 276 , and the flow amount Q2 of coolant drawn in by the main pump 219 is set larger than the flow amount Q1 Coolant that enters the magnetic separator 202 from rare earth (Q2 <Q1).

As a modified example, an upper funnel 275, such as a conical tube that narrows downward, and a lower funnel 276, such as a conical tube that widens upward in diameter, may overlap as shown in FIG. 20. In this case, too, the flow amount Q2 of coolant that is sucked in by the main pump 219 is set larger than the flow amount Q1 of coolant that enters the magnetic switch 202 from rare earth (Q2 <Q1).

The structure of the float regulator 223 is shown in detail in FIG. 21. The float regulator 223 has a ring-like float 277 , and a bottom plate 278 , which is attached to the lower end of the suction pipe 224 , and the float 227 are joined together by elastic, concertina-like partitions 279 . A circular bore 224 a, which is open within half of the partitions 279 , is formed at the lower end of the suction pipe 224 . When the float regulator pump 225 (see FIG. 17) is driven, foreign matter from abrasive chips, etc., floating on the coolant surface, along with the coolant, flow into the partition walls 279 from the inside of the float 277 of the float regulator 223, and become by the circular bore 224 a of the suction pipe 224 sucked and fed to the bed B of the gear grinding machine 201 . The bed B is rinsed by the coolant, which is fed together with the foreign bodies. The foreign bodies that float on the coolant surface in the main tank 203 are thus caught by the float regulator 223 and at least not fed to the grinding point of the grindstone G of the gear grinding machine 201 and the gearwheel W.

Incidentally, for example, methods shown in FIGS. 22 to Fig. 24, it is possible as artifices float around the foreign body from dust etc., the surface on the coolant top in the main tank 203 to bring the float controller 223, and the restraining quantity to increase foreign bodies.

That is, in the example shown in Fig. 22, a plan view, the orientation of the outlet opening 202 a in the lower part of the magnetic separator 202 is set from rare earth so that it generates a flow in the direction of the arrow, and the float regulator 223 is attached to the end of the flow.

In the example shown in FIG. 23, the effective pressure of a drain opening of a spray extraction device 280 , which is essential as an accessory, is used to spray draining liquid and air through a hose 281 onto the coolant surface in the main tank 203 and thereby to bring the foreign bodies floating on the surface of the coolant to the float regulator 223 . According to the method, the intended goal can be achieved without consuming separate energy because the existing spray mist recovery device 280 is effectively used.

Furthermore, in the example shown in FIG. 24, the foreign matter on the coolant surface is transferred to the float controller 223 when the coolant overflows from the sub tank 205 through an overflow hose 265 to the main tank 203 . According to the method, the intended goal can therefore be achieved without consuming separate energy.

Incidentally, as shown in Fig. 25, the sub tank 205 is formed as a rectangular box which is open at the top and shaped like a flat cone at the bottom, and the pipe 256 (see Fig. 17) is with the Middle connected.

Four inlet pipes 282 connected to the pipe 242 are open in the directions shown in Fig. 25 (directions parallel to the side walls in one direction of rotation), at the four corners at the bottom of the sub tank 205 , a coolant, that is supplied from the pipe 242 is discharged from the four inlet pipes 282 to the bottom of the sub tank 205 in the direction of the arrow, and an eddy current of the coolant is generated in the sub tank 205 . If the direction of the eddy current of the coolant matches the direction of rotation of the agitator blade 263 (see FIG. 17), then a stronger eddy current of the coolant can be generated in the secondary tank 205 .

The sub-tank 205 is shaped like a cone at the bottom, the tube 256 is connected to the center, and a swirl of coolant is generated in the sub-tank 205 , whereby foreign matter can be collected at the center of the bottom of the sub-tank 205 and forced to the outside of the secondary tank 205 can be delivered. As a result, the cleaning frequency of the sub tank 205 can be reduced.

The structure of the diffusion tube 254 (see FIG. 18) is shown in detail in FIG. 26.

That is, FIG. 26 is a partial section of the main tank 203 . As shown here, the diffusion tube 254 is attached to the inside of the side wall of the main tank 203 . The diffusion tube 254 is shaped like a conical tube that is opened wide down at the bottom, and a plug 283 is attached at the center. Four circular bores 283 a are formed in the plug 283 , and the tube 233 is connected to the plug 283 by a pipe bend 284 and a connection point 285 .

Next, the operation of the coolant circulation device described will be described; it works as follows:
When the sub pump 258 is driven, the coolant in the sub tank 205 is supplied through the pipe 256 of the grinding point of the grindstone G of the gear grinding machine 201 and a gear W for cooling and lubricating the grinding point and then drips together with cotton-like grinding cut chips from Loops were created on bed B.

When the Bettspülpumpe 210 and float regulator pump are driven 225 simultaneously, then the refrigerant in the main tank 203 is fed through the tubes 206 and 224 on the bed B of the gear grinding machine 201 to remove foreign bodies of settled dirt, fallen abrasive cut chips flush, etc. at the bed B.

The coolant on the bed B together with the foreign bodies from abrasive chips etc. is introduced into the magnetic separator 203 from rare earth, which roughly removes and collects the magnetic particles from abrasive chips etc. by the magnetic force of the magnetic roller 270 , with a size of 100 µm or more contained in the coolant.

Fig. 27 shows the coolant purification level of the magnetic separator 202 from rare earth. As shown here, foreign matter of 100 µm or more in diameter is effectively retained by the rare earth magnetic separator 202 , and the degree of cleaning for particle diameters of 5-100 µm reaches NAS sizes of 12-16.

Incidentally, the life of the bag filters 229 and the deep level filter 230 of the filter unit 208 becomes the main problem for performing an accurate filtering. Thus, in the embodiment, the maintenance-free magnetic separator of rare earth 202 is arranged in front of the filter unit 208 , and the degree of retention of the magnetic separator 202 of rare earth is increased.

That is, the particle back generally increases degree of hold in inverse proportion to the flow rate digkeit, and the magnetic substance suction force from a magnet increases in inverse proportion to the square of the distance on. Thus, in the embodiment for lowering the Fluid velocity is the amount of flow of cooling medium increased to 240 l / min and the gap of the magnetic Roller is reduced from 9 mm to 5 mm.

Fig. 28 shows the correlation between the nip and the degree of retention for magnetic particles at flow rates of 60, 120 and 240 l / min with a standard gap of 9 mm. In the embodiment (flow rate 240 l / min and gap 5 mm), grinding cut chips, which are magnetically difficult to adsorb due to the cotton-like shape, and martensite and crystal structures with a high degree of retention of 90% can be retained. As a result, the lifespan of the bag filter 229 and the deep level filter 230 of the filter unit 208 can be significantly extended to two months and six months, respectively, compared with those of conventional filters.

The coolant from which the foreign matter from grinding chips etc. roughly removed from rare earth by the magnetic separator 202 flows into the main tank 203 . Since the flow amount Q2 of coolant drawn from the main tank 203 by the main pump 219 is set to be larger than the flow amount Q1 of the coolant entering the rare earth magnetic separator 202 (Q2 <Q1) as described above, this flows Coolant in the main tank 203 into the coolant from the rare earth magnetic separator 202 , and both coolants flow into the main pump 219 ; at least the coolant from the rare earth magnetic separator 202 does not exit into the main tank 203 . Thus, the foreign matter from abrasive chips etc. contained in the coolant from the rare earth magnetic separator 202 does not flow into the main tank 203 .

The foreign matter floating on the coolant surface in the main tank 203 is collected by the float controller 223 as described above, and the coolant containing the foreign matter is supplied through the suction pipe 224 to the gear grinder 201 for purging the bed B, and becomes at least is not supplied to the grinding point of the grindstone G of the gear grinding machine 201 and the gear W, so that the gear W is provided with a high surface quality.

The coolant in the main tank 203 is supplied through the pipe 206 or the purge nozzle 216 to the bed B to purge it, as described above.

The coolant in the main tank 203 is sucked in by the main pump 219 and conveyed through the pipe 207 to the filter unit 208 , where the foreign matter contained in the coolant is removed to a moderate degree by the bag filter 229 and finally through the deep filter 230 can be removed.

That is, as shown in FIG. 18, the coolant from the main tank 203 is introduced from the pipe 207 into the bag filter 229 , through which the foreign matter is removed to a moderate extent.

Fig. 29 shows the coolant purification rate by the bag filter 229th As shown here, particles with a diameter of 50 µm or more can be completely removed by the bag filter 229 (NAS size = 00), and the degree of cleaning for particle diameters of less than 50 µm reaches NAS sizes of 11-12.

The coolant from which the foreign matter has been removed to a moderate degree through the bag filter 229 is introduced through the tubes 231 , 234 and 232 into the deep-level filter 230 , through which the foreign matter is finally removed and finer particles are retained.

Fig. 30 shows the coolant purification rate by the low-level filter 230. As shown here, particles of 15 µm or more in diameter can be completely removed by the deep nevil filter 230 (NAS size = 00), and the degree of cleaning for particle diameters of less than 15 µm is given a NAS size of 5 or less; it is possible to achieve the same degree of purification as the degree of purification using conventional diatomaceous earth filters.

Incidentally, each bag filter 229 is like a bag, and when the bag filter is clogged, abrasive cut chips stick to the inside of the bag filter like a cake that is several 10 mm thick, so that the coolant tel can hardly run off. For this reason, when the bag filter 229 is clogged, the working valve 237 shown in Fig. 18 is closed, and the working valves 239 and 255 and the de-oiling valve 241 are opened to supply ambient air to the bag filters 229 to perform a forced drainage and de-oiling through the ambient air. The drain in each bag filter 229 is initiated through the tube 233 on the diffusion tube 254 into the main tank 203 . At this time spraying is effectively changed by the diffusion tube 254 verhin.

The cleaned coolant from which the foreign matter has thus been removed to a moderate degree and in the final treatment by the bag filter 229 and the deep level filter 230 of the filter unit 208 is passed through the pipe 242 to the sub-tank 205 . The coolant in the secondary tank 205 is conveyed through the pipe 256 by means of the auxiliary pump 258 and is supplied to the gear grinding machine 201 , namely the grinding point of the grinding stone G of the gear grinding machine 201 and the gear W for lubricating and cooling the grinding point, as described above.

Thereafter, the coolant is repeatedly circulated in a closed loop forming channel in a manner similar to that described above while being cleaned by the coolant cleaning device according to the present invention to constantly grind the grinding stone G of the gear grinding machine 201 and the gear W to cool and rinse bed B.

In the coolant cleaning device according to the embodiment, the dirt particles contained in the coolant are first roughly removed from rare earth by the magnetic separator 202 , the remaining dirt particles are removed to a moderate degree by the subsequent bag filters 229 , and then the finally remaining fine fine dirt particles are finally removed by the deep level filter 230 . Thus, the deep level filter 230 is relieved and its meshes can be finely formed to increase the filter accuracy. The quality level of the coolant can be raised to make the gear W as a product with high surface accuracy.

According to the embodiment, the conventional gravel gur-filter, which leads to an increase of the size and high cost of the device is not used, so that the coolant-cleaning device can be manufactured at low cost and durability of the bag filter 229 and the low-level filter 230 can be extended.

Incidentally, the muzzle pressure of the main pump 219 is limited by the pressure resistance of the bag filters 229 and the deep level filter 230 , but such a limitation is not imposed on the sub pump 258 . Thus, a high-pressure pump that generates a high pressure that is required at the grinding point can be used as a secondary pump 258 , and since the cooling 06394 00070 552 001000280000000200012000285910628300040 0002019818491 00004 06275 medium cleaning degree can also be used in addition to a centrifugal pump become sensitive to contamination, such as a trochoid pump (rotary lobe pump), a diaphragm pump or a plunger pump; The flexibility of the selection of the pump is expanded.

The coolant cleaning device according to the embodiment always drives the main pump 219 , whereby the coolant in the main tank 203 is constantly cleaned by the magnetic separator 202 of rare earth 202 and by the bag filter 229 and the deep level filter 230 , regardless of whether the gear grinding machine 201 grinds a workpiece or not.

The embodiment of the coolant cleaning device device for a gear grinding machine, the invention has been discussed, but the invention is also capable of a coolant cleaning device for a tool machine for grooving ball bearings with constant Speed, used for honing, milling, etc. become.

The description made it clear that that according to the invention the dirt particles from chips, dirt etc. contained in the working fluid first are roughly removed from rare earth by the separator, and the remaining dirt particles in medium grades be removed by the following, amorphous filter, and then the fine dirt particles that remain in the end then be removed through the mesh filter. Consequently the mesh filter is relieved and the mesh can be fine be trained to increase filter accuracy. Of the The level of quality of the working fluid can be increased to care for products with high surface accuracy As a result of the relief of the mesh filter sets itself, if the stitches are also finely formed, around the To increase filter accuracy, the mesh filter hardly to and the filter life can be extended.

According to the invention increases when the mesh filter is added, the line pressure upstream of the mesh  filter on. Thus, the pressure gauge detects the rising Pressure, which can reveal the time at which the Mesh filter must be replaced.

According to the invention, when the mesh filter is added is the flow of working fluid through the Circulation channel from the pump to the work site stream flows out. The sensor for the currents thus detects the decrease in the flow rate, causing the time point at which the mesh filter can be replaced must become.

According to the invention, when the mesh filter is added is the flow resistance in the mesh filter, so that the Flow rate of the working fluid drops. The feeler for the flow rate detects that the flow rate of the Ar working liquid drops, and when the flow rate drops, the flow rate control valve is opened and its opening enlarged. This process can be repeated to delay the time when the stitch filter must be replaced to extend its lifespan to extend.

According to the invention flows because the check valve for Prevent backward flow of the working fluid the amorphous filter to the pump in the connection channel of the Amor phen Filters and the pump is arranged when the Drive of the pump is stopped, the working fluid, that remains upstream of the check valve, not back to the pump. If the pump is started again, the working fluid is supplied at the same time at which the pump is started again.

According to the invention, since the work to wash out the Filters fully automatically thanks to the automatic filter wash  device is carried out and no manual work of an Ar manpower needed, the manpower of unpleasant work relieves work, the dirt and considerable workload wall includes.

The description made it clear that that according to the invention the dirt particles in the coolant are included, first roughly through the magnetic separator less often earth will be removed, the remaining dirt particles in medium grade through the following bags filters are removed, and then the lead final, fine dirt particles through the deep level filter can be removed. This is the low-level filter relieved, and its mesh can be fine-formed to raise the filter accuracy. The quality level of the Coolant can be raised to for products with high To ensure surface quality.

According to the diatomaceous earth filter, which is a Enlargement and high cost of the device, not used, so the coolant cleaning device can be provided at low cost and the Filter lifetimes can be extended.

While the description related to preferred th embodiments of the invention has been carried out it will be apparent to those skilled in the art that various changes conditions and modifications can be made herein without that one leaves the invention, and it is because of it aimed that in the appended claims all such Changes and adjustments covered under the real basic idea and scope of the invention fall.

In summary, in a working liquid cleaning device for removing foreign matter contained in a working liquid circulated in a closed loop passage to cool and lubricate a work place of a machine tool and to close the working liquid clean gene, an improvement in that a separator 101 from rare earth, an amorphous filter 102 and a mesh filter 103 are arranged in sequence along the flow direction of the working fluid in the circulation channel for the working fluid.

Claims (11)

1. Work-cleaning device for removing foreign bodies from a working liquid, which rotates in a closed loop channel to be able to be cleaned and to cool and lubricate a workstation of a machine tool, characterized in that at least one rare earth using separator ( 101 ), an amorphous filter ( 102 ) and a mesh filter ( 103 ) are arranged in sequence along the flow direction of the working fluid in the working fluid circulation channel. 2. Working fluid cleaning device according to claim 1, characterized in that a pump ( 109 ) is connected upstream from the amorphous filter ( 102 ), and that a pressure gauge ( 117 ) in the working fluid circulation channel between the pump ( 109 ) and the mesh filter ( 103 ) is arranged. 3. Working fluid cleaning device according to claim 1, characterized in that a pump ( 109 ) is connected upstream of the amorphous filter ( 102 ), and that a sensor ( 123 ) for the flow rate in the working fluid circulation channel, which is from the pump to the work site Machine tool leads, is arranged. 4. Working fluid cleaning device according to claim 2 or 3, characterized in that a regulating valve ( 113 ) for the flow rate and a sensor ( 123 ) for the flow rate in the working fluid circulation channel are arranged, and that the opening of the regulating valve ( 113 ) on the Basis of the flow rate of the working fluid detected by the sensor ( 123 ) is controlled. 5. Working fluid cleaning device according to at least one of claims 1 to 4, characterized in that a pump ( 109 ) is connected upstream of the amorphous filter ( 102 ), and that a check valve ( 112 ) for preventing backward flow of the working fluid from the amorphous filter ( 102 ) to the pump ( 109 ) is arranged in a connecting channel between the amorphous filter ( 102 ) and the pump ( 109 ). 6. Automatic filter washing device, in particular for a device according to at least one of claims 1 to 5, characterized by the following features:
a washing tank ( 126 ) for storing a washing liquid,
a sink ( 127 ) into which a filter ( 102 ) to be washed is to be inserted,
Cylinders ( 128 , 129 , 130 , 131 ) to press alternately from two directions against the filter inserted in the sink,
a pump ( 132 ) for supplying the washing liquid contained in the washing tank to the sink and a switching valve ( 133 ) which is arranged in a line which returns the washing liquid in the sink to the washing tank. 7. Working fluid cleaning device for removing foreign bodies from a working fluid, which rotates in a closed-loop channel to be able to be cleaned by itself and to cool and lubricate a work station of a machine tool, characterized in that
at least one magnetic separator ( 202 ), bag filter ( 229 ) and deep level filter ( 230 ) using a rare earth are arranged in sequence along the flow direction of the working fluid in the working fluid circulation channel. 8. Working fluid cleaning device according to claim 7, characterized in that a funnel ( 275 ) is arranged at the outlet of the magnetic separator ( 202 ),
that a main pump ( 219 ) is arranged between the magnetic separator ( 202 ) and the bag filters ( 229 ), and
that the flow rate (Q2) of the working fluid sucked in by the main pump ( 219 ) is set larger than the flow rate (Q1) of the working fluid which enters the magnetic separator ( 202 ). 9. Working fluid cleaning device according to claim 7 or 8, characterized in that a main tank ( 203 ) between the magnetic separator ( 202 ) and the bag filters ( 229 ) is inserted, and that the main tank ( 293 ) with a float controller or float-controlled surface drain ( 223 ) is provided. 10. Working fluid cleaning device according to claim 9, characterized in that a main pump ( 219 ) is arranged between the magnetic separator ( 202 ) and the bag filters ( 229 ), that a sub-tank ( 205 ) is arranged between the deep-level filter ( 230 ) and the machine tool , and that the main pump ( 219 ) is always driven, regardless of whether the machine tool grinds a workpiece or not, whereby the working fluid in the main tank ( 203 ) constantly from the magnetic separator ( 202 ), the bag filter ( 229 ) and the deep level filter ( 239 ) is cleaned. 11. Working fluid cleaning device according to claim 9 or 10, characterized in that an auxiliary tank ( 205 ) is arranged between the deep level filter ( 229 ) and the machine tool, that inlet pipes in the auxiliary tank ( 205 ) on the four corners near the bottom of the Side tanks are distributed, and that the outlets of the four inlet pipes are aligned parallel to the side walls in a single direction of rotation.