CN100404183C - Electrode for electric discharge machining and machining method for electric discharge maching for roll - Google Patents
Electrode for electric discharge machining and machining method for electric discharge maching for roll Download PDFInfo
- Publication number
- CN100404183C CN100404183C CNB028299876A CN02829987A CN100404183C CN 100404183 C CN100404183 C CN 100404183C CN B028299876 A CNB028299876 A CN B028299876A CN 02829987 A CN02829987 A CN 02829987A CN 100404183 C CN100404183 C CN 100404183C
- Authority
- CN
- China
- Prior art keywords
- electrode
- roller
- processing
- discharge
- discharging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/04—Treating surfaces of rolls
Abstract
The present invention provides a discharge processing electrode, a discharge processing machine and a discharge processing method for discharge processing, which can prevent the concentration of discharge on a roller used for insensitive processing without any spiral processing trace. The present invention is provided with an inner cavity, and processing liquid flows from the front end of the inner cavity. The front end plane of the electrode on the electrode projection plane which is perpendicular to a length direction of the electrode is removed, wherein the removal area corresponds to the area of a hole of the inner cavity and is below 70mm<2>. Moreover, the front end plane of the electrode is in a flat shape with a flat rate more than 1.5, and the flat rate is the proportion (L/T) of the maximal length (L) on the projection plane to the length (T) perpendicular to the maximal length. The electrode discharge processing machine which installs the electrode into a state in which the maximal length (L) of the projection plane is generally in parallel with an axial direction of a roller enables processing fluid to flow out of the inner cavity. Meanwhile, the roller and the electrode can axially move relatively in a circumference direction of the roller, and carry out discharge processing to the roller in a spiral shape.
Description
Technical field
The present invention relates to have the discharge processing that is used to make the inner chamber that working fluid flows out from electrode interior with electrode, have the roller discharging processing machine of this electrode.This discharging processing machine is suitable for the discharge processing of matt finishing (dull finish) with the roller of roll etc.The invention still further relates to the discharge-treating method of rollers such as roll.
Background technology
Itself surface of the roll that uses in the matt finishing of steel band is implemented delustring processing.The delustring processing of roll also adopts discharge processing to carry out except the method for existing projection metallic particles recently.
Discharge processing is in the working fluid of insulating properties, periodically applies the voltage of impulse waveform between machined object and electrode, produces arc discharge, utilizes its heat to make the melt surface of machined object, the processing method of removal.The position that produces discharge on the roller surface generates the pit of the volcano degree of lip-rounding, makes the roller surface become rough surface.Working fluid makes discharge have necessary insulating properties environment, also has simultaneously the processing powder of the dregs of the removal that produces in discharge processing is driven away around electrode, absorbs processing heat, makes the effect of processing part cooling.
The discharge processing of roll is typically uses the discharging processing machine with the electrode that disposes in the face of the roller as machined object, makes the roller rotation, and electrode is carried out to mobile (be generally and move back and forth) at roll shaft.Therefore the roller surface is subjected to spiral discharge processing continuously, produces spiral processing striped on the roller surface.Move repeatedly to roll axial direction as electrode, finally can make whole roller surface become rough surface with the processing discharge.Owing to will produce discharge, it is necessary making gap between electrode and the roller become narrow, so utilize the servomotor of installing on electrode that electrode is advanced or retreat, this gap is controlled to the size that is fit to generating.
Use in as the matt finishing at steel band through the roll of delustring processing, because the concave-convex surface rapid wearing, be a few hours～a couple of days the service life of general roller surface.After making the surface become smoothly behind the roll grinding that concave-convex surface is worn, implement delustring with the processing discharge again and process.Just, roll uses the effective use diameter that directly becomes regulation up to roller repeatedly through grinding → discharge processing → rolling circulation.Therefore require discharge processing in the short as far as possible time, to carry out.
For the delustring processing of the roll that utilizes discharge processing rapidly, be purpose with the working (finishing) area that is increased in the once discharge, can utilize the discharging processing machine that a plurality of electrodes is configured at certain intervals side by side axial the and circumferencial direction of roller.
In the delustring processing of roll utilization discharge processing, there is following problem.
Under aforesaid situation of the roller surface being carried out helical discharge processing, as the intensity of the processing of discharging is strong excessively, can produce serious spirality processing striped, and it also will remain on the roller surface after the processing, be replicated on the steel band that is rolled, produce rolling substandard products.
The phenomenon that has discharge to concentrate in this external discharge processing.This is because (1) discharge produces at machined object (roller) and the narrowest position of gaps between electrodes easily; (2) the processing powder (the cutting dregs of roller and electrode) by discharge generation conducts electricity, owing to become the medium of propagating discharge, is easy to generate discharge at the processing position that powder was detained and causes.
For example follow the discharge processing of roller, the electrode front end is consumed.Therefore after discharge machines, the end face of the electrode of facing mutually with roller along the outside shape of roller circumferencial direction and roll shaft to convex shape become curve form.As the processing of discharging with next roller footpath difference of this electrode pair or the different roller of convex shape, the gap part of roller and electrode narrows down, and discharge concentrates on this part.
As the quantity delivered of working fluid or flow insufficiently, the processing powder is trapped near the electrode easily in addition, and discharge is usually concentrated and is created near the position that discharge once takes place.
As produce the concentration phenomenon of discharge, and then forming the spiral cutter trade of the order of severity along the path of electrode on the roller surface, it is replicated in by on the steel band with rolling system, and its result becomes the reason that produces rolling substandard products.
For concentrating of preventing to discharge, open in the clear 53-72296 communique the spy and delivered the technology that electrode is divided into small pieces.
At United States Patent (USP) the 4th, 870, put down in writing in No. 243 so that discharge stability and be separated into purpose, in working fluid, contain the technology of powder of the conductive material of a small amount of graphite and metallic particles etc.
About the configuration of electrode, to open that to have delivered in order preventing in the clear 55-150923 communique be not the axle center that is configured to towards roller because of electrode contacts the short circuit that causes with roller to electrode the spy, but to be configured to the technology that the rightabout to the roller direction of rotation tilts.
Summary of the invention
The invention provides the discharging processing machine and the discharge-treating method of the concentration phenomenon of the processing striped that can prevent to produce the order of severity and discharge, and the discharge of using therein processing electrode.
To in discharge processing, not produce serious processing striped, can consider that (a) reduces the number of times of the generation discharge of unit interval; Or (b) increase methods such as relative moving speed as the roller and the electrode of machined object.The method of (a) can not be accepted in the discharge processing of the roll of seeking to process rapidly because working (machining) efficiency is reduced.(b) method must increase the transporting velocity of electrode and the revolution of roller, but consider discharging processing machine machinery restriction and for discharge must control electrode and the gap of roller about several 10 μ m, the method is unpractical.
For fear of the phenomenon that discharge is concentrated, remove the method for relative velocity of the method for reduction working (machining) efficiency of above-mentioned (a) and increase electrode (b) and roller, can consider the method that (c) dwindles the area that produces the electrode end surface that discharges.Use the processing density of the method unit are of (c) to uprise, generate the processing striped of the order of severity easily.
As mentioned above, when replacing the roller that will process, different with the roller of processing previously with convex shape as the roller footpath of the roller replaced, the gap of electrode and roller (gap of electrode/roller) partly narrows down, and discharges to concentrate on this part, produces spiral cutter trade.About this phenomenon, because big as the area of electrode end surface, the consumption of electrode diminishes, and the roller footpath and the convex shape of the roller of processing previously remain on the electrode for a long time, produce on the contrary because of the concentrated processing of discharging.
The inventor is conceived to follow the variation in gap of electrode/roller of variation in the roller footpath of processing, as makes electrode grow up to pancake axially adding, and influence will diminish, and is corresponding with roller variation directly easily.Because the curvature in roller footpath much larger than the curvature (radius of curvature is much smaller than the radius of curvature of convex surface) of convex surface, makes the influence of the variation of following the roller footpath drop to minimum, be effective to preventing that discharge from concentrating.
In addition as use, make shaggy working position laterally flat wide,, can prevent the generation of serious processing striped, be difficult to form cutter trade so processing density reduces with what the rotation of roller formed at the flat electrode of roll shaft to lengthening.
Be trapped near concentrating of the discharge that causes the electrode for fear of the processing powder, make electrode become hollow shape, working fluid is flowed out from the inner chamber of electrode, it is effective forming from the method that flows of the outside working fluid of electrode.
Under the situation of using such hollow electrode and since working fluid from the part of the relief width of electrode/roller flow out many, the narrow part in gap is compared with the part of relief width, the processing powder is trapped in the narrow part in gap easily.Therefore the narrow part in gap is very easy to cause that discharge concentrates because of two reasons of delay of the stenosis in gap and processing powder cause.Make discharge concentrate minimization, even as far as possible in order to make the gap, preferably electrode is configured to towards roll shaft heart direction.
In one aspect, the present invention is a kind of discharge processing electrode, having can be from flowing out the inner chamber of working fluid towards the front end of machined object, it is characterized in that, on the electrode perspective plane of the end face of electrode front end projection on the face vertical (below call the front end perspective plane), remove area corresponding to the part in the hole of this inner chamber (below be called the front end projected area) at 70mm with the electrode length direction
2Below, 10mm
2More than, and the end face of electrode front end has with the flat ratio of ratio (L/T) expression of the length (T) of maximum length on this perspective plane (L) and perpendicular direction more than or equal to 1.5 flat pattern.
In one aspect of the method, the present invention is a kind of roller discharging processing machine, has one or more electrode towards the roller configuration, it is characterized in that, this electrode has the inner chamber that working fluid is flowed out from the front end towards roller, this electrode is configured on the electrode perspective plane of the end face of electrode front end projection on the face vertical with the electrode length direction (below call the front end perspective plane), removes area corresponding to the part in the hole of this inner chamber (below be called the front end projected area) at 70mm
2Below, 10mm
2More than, and the end face of electrode front end has with the flat ratio of ratio (L/T) expression of the length (T) of maximum length on this perspective plane (L) and perpendicular direction more than or equal to 1.5 flat pattern, and the maximum length on above-mentioned perspective plane (L) the axial cardinal principle of roller is parallel therewith.
Wherein so-called " substantially parallel " means that the direction of maximum length (L) on perspective plane and the axial angle of roller are in 10 °.This angle in 5 °, most preferably is 0 ° preferably.
In the mode that is fit to, above-mentioned one or more electrode is configured to the axle center of the length direction of electrode towards roller.Have at discharging processing machine under the situation of a plurality of electrodes, preferably electrode becomes multiple row at the roller circumferencial direction, is configured to zigzag.
Adopt words of the present invention, the discharge-treating method of the roller that uses above-mentioned discharging processing machine can be provided, it is characterized in that, Yi Bian by working fluid is flowed out from above-mentioned inner chamber, make on one side roller and electrode at circumferencial direction with axially relatively move, the processing of discharging of spirality pair roller.
In having the above-mentioned discharge processing that is configured to zigzag electrode, preferably circumferencial direction by adjusting above-mentioned roller and/or axial relative moving speed, residual not have by the processing of discharging of the mode pair roller in the zone of discharge processing.
Description of drawings
Fig. 1 is the simple key diagram of roller with discharging processing machine.
Fig. 2 is the configuration direction when being horizontal direction with the front end perspective plane shape of the representational hollow electrode A～D of front end projected area (area of section) expression test usefulness with the roll shaft.
Fig. 3 has carried out the schematic diagram of the finished surface under the situation of discharge processing with electrode A～D of Fig. 2.
Fig. 4 is configured to electrode the key diagram of zigzag example in the multiple row mode for expression.
Fig. 5 is for representing the key diagram of the front end perspective plane shape of the electrode of use in an embodiment.
Fig. 6～Figure 11 is to the side view of seeing from roll shaft for the key diagram of expression electrode with respect to the configuration of roller.
Fig. 6 departs from the state that disposes towards roll shaft heart direction for expression makes electrode.
Fig. 7 is configured in state towards roll shaft heart direction to electrode for expression.
The roller that Fig. 8 processes with the electrode of Fig. 6 for expression is replaced with the situation under the situation of larger-diameter roller [Fig. 8 (b)] from the roller [Fig. 8 (a)] than minor diameter.
The roller that Fig. 9 processes with the electrode of Fig. 7 for expression is replaced with the situation under the situation of larger-diameter roller [Fig. 9 (b)] from the roller [Fig. 9 (a)] than minor diameter.
Figure 10 for the expression a plurality of electrodes all towards the roll shaft heart, be configured to the situation of multiple row at the roller circumferencial direction.
Figure 11 is illustrated in the not position relation of the electrode under the situation of the roll shaft heart and major diameter and minor diameter roller of electrode.
The specific embodiment
Fig. 1 is an example that schematically illustrates the discharging processing machine that uses in roll discharge processing.The roll 8 of machined object can be installed in this discharging processing machine rotatably.Just the roller supporting part of its both sides is placed on the pedestal 11, behind end face fixture 5,6 location, drives roll 8 with roll driving apparatus 9 rotations and rotates.On the electrode bracket 7 of this discharging processing machine, generally a plurality of electrodes are installed with suitable configuration.Electrode bracket 7 moves back and forth to the width across roller at roll shaft by spin leading screw (Bowl Screw) mechanism 12 of passing its head is rotated.
Not expression among the figure, for the clearance control of electrode front end and roller being become the optimal size of discharge, installing electrodes will be undertaken by servomotor and screw mechanism on electrode bracket.The gap of electrode and roll is full of with working fluid.
The roll of the discharging processing machine of representing among use figure discharge processing when making roll rotation, make electrode bracket at roll shaft to moving, therefore make electrode at roll shaft to moving.Just as the roller of machined object and electrode owing in discharge processing, on the circumferencial direction of roller and axial both direction, relatively move, so the processing striped that is processed to form because of discharge is walked spirality on the roller surface.
In illustrated embodiment, roller rotation is driven, represented discharging processing machine that electrode is moved in the axial direction, about the relatively moving of roller circumferencial direction, electrode is moved at the roller circumferencial direction, replace rotating driven roller, also can both use together.Equally about roll shaft to relatively move, also can not be to make electrode, but roller or roller and electrode both sides are being moved axially.
Discharge processing electricity consumption of the present invention has flows out the inner chamber that working fluid is used, and working fluid is flowed out to machined object (for example roll) from the front end of electrode.Be typically this electrode and be the inner hollow electrode that the tubulose of through hole is arranged.Just passable, there is no need total length at its length direction through electrode but as long as the outlet of inner chamber is positioned at the electrode front end.For example the inlet of working fluid can be positioned at the centre of electrode length.Provide working fluid can utilize well-known suitable method to the electrode inner chamber.
The length direction of so-called electrode means the length direction that is generally elongated discharge machined electrode, and is crossing with the end face of electrode front end.But because end face limpens because of the consumption of electrode in when discharge or tilts sometimes, so it is vertical also to be not limited to the end face of the length direction of electrode and its front end.In the present invention, working fluid flows out from its front end by the inner chamber that is located in the electrode.Therefore the outflow direction of length direction and working fluid is unanimous on the whole.
By working fluid is flowed out from the electrode front end, form working fluid from the narrow gap between electrode and the machined object liquid in outside stream towards periphery.Therefore can drive the processing powder that in discharge processing, produces reliably away near the electrode, can prevent to concentrate because of the processing powder is trapped near the discharge that causes the electrode.
Discharge of the present invention processing is with on the electrode perspective plane of end face projection on the face vertical with the electrode length direction of the opposed electrode front end of electrode handle and machined object (below be called the front end perspective plane), removes area corresponding to the part in the hole of this inner chamber (below be called the front end projected area) at 70mm
2Below, and the end face of electrode front end has with the flat ratio of ratio (L/T) expression of the length (T) of maximum length on this perspective plane (L) and perpendicular direction more than or equal to 1.5 flat pattern.
The projected area meaning that what is called is removed corresponding to the electrode front end of the part in the hole of inner chamber is the area that becomes the electrode end surface of discharge face.Surpass 70mm as electrode front end projected area
2Then because the consumption of electrode front end is slow, under the situation of the machined object that the roller as machined object is replaced to other shapes, electrode front end shape needs the time to the shape of the shape that becomes the roller after replace on the edge, can not fully prevent because of the concentrated generation cutter trade that causes that discharges.
Too small as electrode front end projected area, because the consumption of electrode is fast, the frequency of changing electrode increases, so preferably be limited to 10mm down
2About.The front end projected area is 15～50mm further preferably
2
Pair roller discharges under the situation of processing, profile of the present invention be pancake electrode on the electrode bracket of discharging processing machine, be installed into the front end perspective plane maximum length (L) substantially and the axially parallel of roller.Electrode is not cut apart like this, and discharge is disperseed, can suppress discharge and concentrate.
Fig. 2 is for representing the front end perspective plane shape and the configuration of various hollow electrodes with front end projected area (being expressed as area of section in the drawings).The axial of figure central roll is horizontal direction.Fig. 3 has carried out the machining state on the roller surface under the situation that discharge processes for form expression with electrode sections with electrode A, B, C, the D of Fig. 2.
Electrode A, B are the cylindrical hollow electrodes that the contrast usefulness of circular cross-section is arranged, and the front end projected area is different mutually.Electrode C, D be identical shape be the hollow electrode of flat pattern by cross section of the present invention, but the direction difference when being installed on the electrode bracket.Just the maximum length (L) on electrode C front end perspective plane (below be also referred to as major axis) is towards the roller circumferencial direction, in contrast, the major axis of electrode D towards roller axially.
As the electrode A pair roller that uses the big circular cross-section of the front end projected area processing of discharging, as shown in Figure 3, because power-discharging density is low, become the group that does not reach electrode outside dimension (about the same in the size of electrode wall thickness) on the roller surface because of the maculiform of discharge generation is concavo-convex, remaining part is concavo-convex sparse.Become the spirality apperance that is made of concavo-convex like this group on roller, become and whenever repeat once concavo-convex group and be expanded, processing obtains progress.When the whole face of roller becomes concavo-convex group, can not see the helix apperance of seeing at first on the roller surface, in fact, the greater than other parts in spiral concavo-convex group can more discharge, so become small recessed state owing to causing than other positions.During with the rolling steel strip, this depression is replicated on the steel band.
Under the situation of the electrode B of the little a lot of circular cross-section of end projection area, discharge becomes the state that is dispersed to electrode width substantially, does not form mottled concavo-convex sparse position before use.But because it is narrow to produce the width (width of processing striped) of discharge, process the density height, begin to produce the spiral cutter trade of the order of severity from the processing initial stage.
For the electrode C of its major axis of flat electrode, we can say that the result is also identical with electrode B towards the circumferencial direction (direction of rotation) of roller.This be since generally because of the rotation of roller cause to the relative moving speed (peripheral speed) of the roller/electrode of circumferencial direction much larger than axial relative moving speed at roller.For example the relative moving speed of roller/electrode is 100～800mm/sec at the circumferencial direction of roller, roller axially be 1～20mm/sec, the angle of the circumferencial direction of helix and roller is below 10 °.Therefore relatively move based on circumferencial direction.In the width (the axial electrode size vertical) of the electrode of circumferencial direction small size,, become the result identical with electrode C with the electrode B of minor diameter so the width of discharge processing is little for the minor axis on the front end perspective plane that is equivalent to electrode with circumferencial direction.
On the other hand, as the major axis on the front end perspective plane of using flat electrode according to the present invention axial electrode D towards roller, the pair roller processing of generating electricity, then the little concavo-convex group of the wall thickness degree of electrode forms the processing apperance of disperseing with the width that reaches the electrode major axis.Become the size of the major axis on electrode front end perspective plane with this electrode width that is configured in the circumferencial direction of roller, the width of discharge processing is widened.Therefore the discharge of D is dispersed best.Because the apperance of the concavo-convex group that such width is little forms spirality, and the order of severity of the initial group one by one that forms is little, as repeats, and the helix apperance is also not obvious, and it is concavo-convex uniformly to form total quality.
Just as flat electrode be configured to the axially parallel of major axis and roller because the processing striped is expanded the back dispersion, even the front end projected area is little, process not strong yet, thereby can prevent because of forcing the cutter trade of worker's generation.
In the delustring processing of steel band is rolling, using the above-mentioned electrode A～D of employing to discharge to process makes under the situation of shaggy roll, roll with electrode A, B or C discharge processing, roll the back at surface of steel plate even without finding under the special abnormal conditions, as grinding inspection, find that quality is bad with grinding stone.Just cave in owing to the roller surface is serious at the position of the spirality apperance of processing at first, demonstrate projection on steel band, the protruding apperance of grinding rear screw shape is exposed, and it is bad to become quality.
In contrast, the roll that uses electrode D to discharge and process, the depression of the concavo-convex group of the part of the spirality apperance of initial processing is very tiny.Its result is used for this roller rolling, and the quality that also can not produce steel band is bad.
With in the electrode, the flat ratio that the ratio (L/T) of the length (T) of maximum length (L) on the electrode front end perspective plane and perpendicular direction is represented is more than 1.5 in discharge of the present invention processing.Less than 1.5, the dispersion shape of discharge is insufficient as flat ratio, and result and electrode B are close.
On the other hand, excessive as the flat ratio of electrode, must strengthen electrode bracket, the part that can occur in roller edge part electrode is from problems such as roller depart from.Generally preferably flat ratio below 10.Further preferably flat ratio is 3～8.Where specification and needs according to device are worked into the roller edge, can select suitable flat ratio.
The present invention discharges to process with electrode and can use copper, graphite, both material making composite, that use so far.
Discharge processing also can be implemented with an electrode, but the working (finishing) area after the time processing is widened, and preferably a plurality of electrodes is configured on the electrode bracket side by side.Under the situation of using a plurality of electrodes, as shown in Figure 4, preferably electrode is configured to line up the multiple row toothing at the circumferencial direction of roller.
In example shown in Figure 4,12 electrodes all are configured to the long axis direction on its front end perspective plane parallel with axial (horizontal direction of figure) of roller, and per four form a line, are divided into three row.Therefore three row are row that the circumferencial direction at roller separates.The distance that each row electrode separates is identical, respectively is listed in axially departing from slightly of roller by making, and becomes jagged configuration.
As the multiple row to the circumferencial direction of roller is configured to zigzag, the zone of the electrode group discharge processing of first row is overlapping with the area part of secondary series electrode group discharge processing, does not have the residual zone that processes without discharge between the zone of discharge processing.In addition, by rotary speed and the discharge processing speed (just roller and electrode at the circumferencial direction of roller and the axial relative moving speed of roller) of electrode of adjusting roller to the axial conveying of roller, the discharge machining area of first row and secondary series is overlapped, and can make does not have residual zone without discharge processing between the zone of discharge processing.Situation about secondary series and tertial electrode group is also identical.
The working fluid that uses in discharge processing generally is an insulating oil.In order to improve the stability of discharge, in working fluid, also can contain one or more the powder of from the conductor of carbon (for example graphite), metal, silicon etc. or semiconductor, selecting.Especially preferably be added in the working fluid is carbon.
In the present invention, make working fluid, flow out to the roller surface from the front end of electrode through the inner chamber of electrode.As required, the part of working fluid also can offer not the path by electrode.It is last for example to remove processing powder with the method for magnetic with the working fluid of crossing, and can use in discharge processing again.
Embodiment
(embodiment 1)
On described discharging processing machine about Fig. 1, the hollow electrode that multiple front end projection of shape a～k is arranged shown in Figure 5 is installed, implement the discharge processing experiment.
In each test, 12 electrodes of same projection shape are configured to as shown in Figure 4 zigzag.Under the situation of the electrode of flat pattern, each electrode is configured to the maximum length direction on front end perspective plane and the axially parallel of roller.Make roller rotation time, make electrode axially move back and forth the processing experiment that discharges at roller.The working fluid that uses makes insulating oil, in discharge processing this working fluid is flowed out from front end by the inner chamber of electrode.
Implement discharge processing with the concavo-convex condition that on the roller surface, forms center line average roughness Ra=1.0 μ m or 3.0 μ m.Check result with the steel band of the rolling system after such discharge processing is shown in table 1.
In table 1, the symbol " * " of expression electrode front end projected area and flat ratio is expressed as outside the scope of the present invention.The processing striped is obviously found out in symbol " * " expression of check result, must roll change." △ " expression processing striped is not too obvious, but can confirm that with visual the processing striped is arranged.The processing striped is can't see in " zero " expression fully.
Table 1
As shown in table 1, as using electrode front end projected area at 70mm
2Below, flat ratio is at the electrode of the shape more than 1.5, and the breaker roll processing of discharging in the inspection with the steel band of this rolling system, obtains good result.
Use electrode of the present invention, as the discharge processing about the center line average roughness Ra=0.6～4.0 μ m that use implementing on the roll, in to inspection operation with the steel band of this rolling system, there is not quality not conform to, the frequency that this external electrode is changed also can keep satisfying the degree of operation.
(embodiment 2)
In the present embodiment, illustrate and the use-case subrepresentation is configured to the effect of its length direction towards the axle center of roller (turning cylinder) to the discharge processing with inner chamber that outflow working fluid of the present invention uses with electrode.
Fig. 6 for expression make discharge processing with its length direction of electrode 1 usefulness not towards the configuration status of the angle in the axle center 3 of roller 2.On the other hand, the mode that Fig. 7 is fit to by the present invention for expression is used the state of the length direction of electrode 1 towards the angle configurations in the axle center 3 of roller 2.Because these are side views, on figure, can't see, the inner chamber of using at the inside of electrode 1 outflow working fluid connects at length direction.
Fig. 8 (a) is electrode shown in Figure 6 configuration, and expression on one side makes working fluid flow out from the electrode front end, Yi Bian the state that the minor diameter roller is discharged and processes.With the end face of roller 2 opposed electrodes 1 because of discharge processing causes consumption, become along the curved surface of the curvature of minor diameter roller.Arrow among the figure schematically illustrates flowing of working fluid.In Fig. 8 (a), because the gap between roller 2 and the electrode 1 is uniformly, so working fluid all the flowing Anywhere that provides by electrode from the gap with the cardinal principle even flow.
Fig. 8 (b) expression uses such end face to become along the electrode 1 of the curved surface of the curvature of minor diameter roller, to the discharge state of processing of major diameter roller.In this case, the narrowest A position takes place from the gap of roller 2 and electrode 1 easily in discharge.On the other hand, shown in thick arrow, working fluid flows out from the B position of relief width easily, and shown in thin arrow, discharge tails off at the A position.Therefore in discharge the many A positions of growing amount that process powder taking place easily, add and produce discharge because of the delay of processing powder, concentrate so discharge, causes generation processing striped easily.
On the other hand, about the situation of preferred electrode configuration (length direction of electrode 1 is towards the axle center 3 of roller 2) shown in Figure 7, Fig. 9 (a) and (b) represent to be converted to from the processing of minor diameter roller the state that adds man-hour of major diameter roller.Shown in Fig. 9 (a), by processing that minor diameter roller 2 is discharged, the end face of electrode 1 becomes along the curve form of the curvature of minor diameter.
As this electrode 1 is used in the discharge processing of major diameter roller, shown in Fig. 9 (b), the narrowest electrode takes place at the position on every side in the gap easily in discharge.Different with Fig. 8 (b), even owing to what become in the whole gap of electrode periphery, the either side at A position and B position all causes discharge equally.Working fluid be flowing in A position and B position also substantially evenly.Therefore the processing powder because of discharge generation can not be detained in the part, is difficult to take place discharge processing.
As electrode is cylindrical shape, and working fluid is many from the outflow of the axial both sides of the roller of electrode, and the mobile of working fluid becomes inhomogeneous sometimes.In the present invention, be the cross section that pancake electrode is configured to the major axis in cross section and the axially parallel of roller.Therefore, owing to can be suppressed to minimum limit to the increase of flowing out working fluid from the axial both sides of roller, concentrate so can prevent discharge effectively.
Figure 10 represents the situation that a plurality of electrodes that use Fig. 9 (a) to dispose like that discharge and process.The roller circumferencial direction be configured to three sections electrode 1,1 ', 1 " all be configured to axle center towards roller.Can not see that in the drawings for example as shown in Figure 4, preferably each section is made of the row of the electrode of a plurality of electrodes (for example 3～6), the electrode position of each section staggers mutually, and electrode is configured to zigzag, makes with other the electrode of section not overlapping.In order to control the gap of each electrode and roller, with servomotor and screw mechanism 4,4 ', 4 " can advance to the length direction of electrode or retreat.
Figure 11 represents configured electrodes shown in Fig. 8 (a) and (b), to the situation of minor diameter roller 2 and the major diameter roller 2 ' processing of discharging.D is the diameter of major diameter roller, and d is the diameter of minor diameter roller, and α is the line in the axle center of the intersection point that connects electrode axis (length direction) in the processing minor diameter roller and roller periphery and roller and the angle of cut of electrode axis.Major diameter roller 2 ' situation under the angle of cut because littler than α, be appreciated that into the angle of cut and directly change with roller.On the other hand, resembling under the situation of configured electrodes as shown in Figure 10, α because of the roller footpath does not change, is not 0 ° always certainly.
In table 2 and 3 expression resemble respectively Figure 10 and shown in Figure 11 configured electrodes, to discharge result under the situation of processing of major diameter roller and minor diameter roller.Making electrode is the structure that is listed in three sections of roller circumferencial direction configurations of four electrodes of each row.The electrode of test usefulness is the electrode with the flat pattern shown in the mark f of table 1.In the electrode configuration with the Figure 11 shown in the table 3, making each electrode be positioned at angle of cut α with the minor diameter roller is 2～5 ° scope.
During roller in table directly changes, for example after the roller processing of " 600 → 500 " expression to diameter 600mm, the roller of diameter 500mm is processed.The processing roughness meaning is the processing of discharging under the condition of center line average roughness (Ra) for the value of expression.Working fluid uses the working fluid identical with embodiment 1.Evaluation in each is tested is observed from processing and is begun through the roller surface behind the certain hour, with whether seeing that concentrating the spirality that causes to process striped because of discharging carries out.Zero meaning is to can't see the situation of processing striped, and * the meaning is to see the situation of processing striped.
Table 2
Table 3
Each electrode being disposed become to resemble Figure 10 under the situation in the axle center of roller, as shown in table 2, even the roller of processing directly changes, can not confirm spiral cutter trade in the Total Test, be good result.
On the other hand, as shown in table 3 each electrode being disposed under the situation that becomes to resemble Figure 11 to tilt from direction towards the axle center of roller, directly change under the big situation at thin situation and the roller of processing roughness, can confirm the spirality cutter trade.Think that becoming bad result under the thin situation of processing roughness is because the thin more processing of roughness, the gap of electrode and roller is more little, and the mobile degree of irregularity of working fluid obviously has influence on finished surface.In the thick processing of roughness, estimate because the relief width of original electrode and roller even working fluid is mobile inhomogeneous, is processed powder and also can fully be discharged from the gap.
More than be illustrated being fit to mode of the present invention, but the present invention is not limited to the mode of above explanation.For example the flat pattern on the perspective plane of electrode front end is preferably oval, also can be rectangle.
Claims (9)
1. electrode use in a discharge processing, have can from the inner chamber of the opposed front end outflow of machined object working fluid, it is characterized in that,
The end face of electrode front end on the electrode perspective plane of projection on the face vertical with the electrode length direction, is removed area corresponding to the part in the hole of this inner chamber at 70mm
2Below, 10mm
2More than, and the end face of electrode front end to have ratio L/T with the length T of maximum length L on this perspective plane and perpendicular direction be shape more than 1.5.
2. a roller discharging processing machine has one or more electrode that disposes with the roller subtend, it is characterized in that,
This electrode has can make the inner chamber of working fluid from flowing out with the opposed front end of roller, this electrode is configured to the end face of electrode front end on the electrode perspective plane of projection on the face vertical with the electrode length direction, removes area corresponding to the part in the hole of this inner chamber at 70mm
2Below, 10mm
2More than, and the end face of electrode front end to have ratio L/T with the length T of maximum length L on this perspective plane and perpendicular direction be flat pattern more than 1.5, and the maximum length L on the described perspective plane axially parallel of roller therewith.
3. discharging processing machine as claimed in claim 2 is characterized in that, described electrode is configured to the axle center of the length direction of electrode towards roller.
4. as claim 2 or 3 described discharging processing machines, it is characterized in that having two the above electrodes, these electrodes form multiple row at the circumferencial direction of roller, are configured to zigzag.
5. the discharge-treating method of a roller uses the described discharging processing machine of claim 2, it is characterized in that,
By on one side working fluid being flowed out from described inner chamber, Yi Bian make roller and electrode at the circumferencial direction of roller with axially relatively move, thus the pair roller processing of discharging twist.
6. the discharge-treating method of a roller uses the described discharging processing machine of claim 3, it is characterized in that,
By on one side working fluid being flowed out from described inner chamber, Yi Bian make roller and electrode at the circumferencial direction of roller with axially relatively move, thus the pair roller processing of discharging twist.
7. the discharge-treating method of a roller uses the described discharging processing machine of claim 4, it is characterized in that,
By on one side working fluid being flowed out from described inner chamber, Yi Bian make roller and electrode at the circumferencial direction of roller with axially relatively move, thus the pair roller processing of discharging twist.
8. discharge-treating method as claimed in claim 7 is characterized in that,
Rotary speed by adjusting described roller and/or described electrode be to the axial feed rate of roller, with not residual by the processing of discharging of the mode pair roller in the zone of discharge processing.
9. as each described discharge-treating method in the claim 5～8, it is characterized in that described roller is matt finishing roll.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2002/012808 WO2004052579A1 (en) | 2002-12-06 | 2002-12-06 | Electrode for electric discharge machining and electric discharge machine for roll and machining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1694775A CN1694775A (en) | 2005-11-09 |
| CN100404183C true CN100404183C (en) | 2008-07-23 |
Family
ID=32500595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028299876A Expired - Lifetime CN100404183C (en) | 2002-12-06 | 2002-12-06 | Electrode for electric discharge machining and machining method for electric discharge maching for roll |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN100404183C (en) |
| AU (1) | AU2002354436A1 (en) |
| WO (1) | WO2004052579A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2462419A (en) * | 2008-08-04 | 2010-02-10 | Sarclad Ltd | Method and apparatus for improving roll texturing using electrical discharge machining |
| GB2478796B (en) | 2010-03-19 | 2014-01-08 | Upcycle Holdings Ltd | Process for forming a mould |
| GB2616344A (en) * | 2022-01-10 | 2023-09-06 | Sarclad Ltd | Improvements to electrical discharge texturing machines |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5372296A (en) * | 1976-12-10 | 1978-06-27 | Mitsubishi Electric Corp | Electrode for electrical discharge machinery |
| US4705932A (en) * | 1984-02-15 | 1987-11-10 | Fanuc Ltd. | Electrical discharge boring machine |
| US5026463A (en) * | 1988-08-16 | 1991-06-25 | Hoechst Atkiengesellschaft | Process and apparatus for preparing the surface of a plastic molding by means of an electrical corona discharge |
| US6165422A (en) * | 1999-03-01 | 2000-12-26 | Modern Hard Chrome Service Company | Apparatus for electric-discharge texturing of a roll |
| JP2002283145A (en) * | 2001-03-22 | 2002-10-03 | Asutekku:Kk | Small-diameter pipe electrode holding collet |
-
2002
- 2002-12-06 CN CNB028299876A patent/CN100404183C/en not_active Expired - Lifetime
- 2002-12-06 AU AU2002354436A patent/AU2002354436A1/en not_active Abandoned
- 2002-12-06 WO PCT/JP2002/012808 patent/WO2004052579A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5372296A (en) * | 1976-12-10 | 1978-06-27 | Mitsubishi Electric Corp | Electrode for electrical discharge machinery |
| US4705932A (en) * | 1984-02-15 | 1987-11-10 | Fanuc Ltd. | Electrical discharge boring machine |
| US5026463A (en) * | 1988-08-16 | 1991-06-25 | Hoechst Atkiengesellschaft | Process and apparatus for preparing the surface of a plastic molding by means of an electrical corona discharge |
| US6165422A (en) * | 1999-03-01 | 2000-12-26 | Modern Hard Chrome Service Company | Apparatus for electric-discharge texturing of a roll |
| JP2002283145A (en) * | 2001-03-22 | 2002-10-03 | Asutekku:Kk | Small-diameter pipe electrode holding collet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1694775A (en) | 2005-11-09 |
| WO2004052579A1 (en) | 2004-06-24 |
| AU2002354436A1 (en) | 2004-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100591452C (en) | Distributed arc electroerosion | |
| US7189145B2 (en) | Method of and apparatus for producing roll | |
| US3800117A (en) | Edm apparatus for finishing rolls | |
| JP4906229B2 (en) | Method and apparatus for near net shape high speed rough machining of blisks | |
| US8480016B2 (en) | Device for processing feedstock | |
| Hsue et al. | Toward synchronous hybrid micro-EDM grinding of micro-holes using helical taper tools formed by Ni-Co/diamond Co-deposition | |
| JP2008137148A (en) | Curved groove processing of polishing pad | |
| CA2534721C (en) | Cutting edge honing process | |
| JP5846742B2 (en) | Method for producing a honeycomb extrusion die from a die body | |
| US3878353A (en) | Method for finishing rolls | |
| CN100404183C (en) | Electrode for electric discharge machining and machining method for electric discharge maching for roll | |
| CN108747603A (en) | The coarse-fine of non-rotating optical array integrates progressive method for grinding | |
| JP5743431B2 (en) | Electric discharge machining device using a rotating circular blade | |
| JP2008290209A (en) | Polishing device and method for manufacturing surface plate therefor | |
| US4850147A (en) | Electrode shaping | |
| US11235403B2 (en) | Electrical discharge machining electrodes and associated methods | |
| KR100633502B1 (en) | Electrode for electric discharge machining and electric discharge machine for roll and machining method | |
| CN217255469U (en) | Grinding pad | |
| JPH0583329B2 (en) | ||
| CN109570915A (en) | The bearing processing method of the processing unit (plant) and application of large-scale the hydrostatic bearing device | |
| JP3791357B2 (en) | Electric discharge machining electrode and electric discharge machine | |
| EP3616838B1 (en) | Form rotary dresser and dressing method | |
| RU2162401C2 (en) | Method of continuous grinding of tapered roller spherical ends | |
| EP0163359B1 (en) | Precision tw electroerosion apparatus with staggered multiple v-notched guides | |
| US20020096497A1 (en) | Continuous wire EDM for forming blind holes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Tokyo, Japan Patentee after: NIPPON STEEL & SUMITOMO METAL Corp. Address before: Tokyo, Japan Patentee before: NIPPON STEEL & SUMITOMO METAL Corp. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190618 Address after: Tokyo, Japan Patentee after: NIPPON STEEL & SUMITOMO METAL Corp. Address before: Japan Osaka Patentee before: SUMITOMO METAL INDUSTRIES, Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080723 |
|
| CX01 | Expiry of patent term |