KR930008377B1 - Electrical discharge surface conditioning device - Google Patents

Abstract

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Description

Discharge Surface Processing Equipment

1 is a schematic diagram of an electric discharge machining apparatus.

2 is a plan view of a device modified from the FIG. 1 device.

3 is an enlarged plan view of the cylindrical electrode shown in FIG.

4 is a cross-sectional view of the second degree electrode.

5 is an enlarged plan view of an electrode surface according to the device of the present invention.

6 is an enlarged partial view of a cylindrical electrode.

7 is a schematic diagram of the device of the present invention showing an installation and control device associated with a discharge electrode.

8 is an electrical flow chart for controlling the discharge of an electrode for a device of the present invention.

9 is an enlarged view of a cylindrical electrode of a modification.

10 is an enlarged view of a cylindrical electrode of yet another variant.

* Explanation of symbols for main parts of the drawings

10: tank 14: roll

16: workpiece surface 20: workpiece axis

22: cylindrical electrode 23: tube

24, 24A, 81: electrode mounting assembly 28: the axis of the electrode

30: conductive disc 32: non-conductive disc

34: groove 38: conduction ring

60, 62: sensor 72, 74, 76: timepiece

87: servo motor.

The present invention relates to a device for discharging the surface of a roll, in particular the structure of a new electrode and an electrode mounting arrangement for such a device.

Indeed, in the steel industry for some time, cold rolled gloss finish rolls and patterned rolls of steel sheets or strips have been used to machine the surface of finished products. One patent that exemplifies this practice and discloses such a finishing method is US Pat. Bills et al. Disclose that a plate or strip material processing roll is processed to process a gloss or texture on the surface of the plate or strip material. The processing of the roll is generally achieved by the electric discharge machining method. Since the publication of Patent No. 3,754,873, a series of patents for electric discharge machining of cold forming steel rolls have been as follows. In other words,

It is noted that in the above patents 3,800,177 and 3,878,353 are issued in the name of the inventor. These patents disclose that the rolls can be processed in a discharge method that requires the roll to be partially wound into a nonconductive fluid reservoir that is in correspondence with the discharge electrode. Other conventional patents disclose various electrode structures, as well as various control circuits for electric discharge machining apparatus. In addition, the above various patents do not necessarily relate to the cooling linear roll processing method, but actually to the general implementation of the electric discharge machining apparatus and the control apparatus for the apparatus.

FIELD OF THE INVENTION The present invention relates, in particular, to electrical discharge machining of rolls, which rolls are used for the production of plates and strips, and in particular to devices for patterning or runnering such rolls. However, the present invention can be used for processing a pattern on a long shaft such as a temper mill work roll, a short shaft such as a crankshaft, a wear surface such as a cylinder hole, and a flat surface such as a machine slide surface. .

Although conventional apparatus and methods have been successful and useful, it is found that there are some disadvantages. For example, on surfaces such as curved rolls in particular, it is difficult to control certain patterns or patterns that are inscribed therein. It is also difficult to control the machining operation by adjusting the intensity, delay and position of the discharge pulse. The present invention provides an apparatus for improving the ability to control the discharge on a surface, especially a surface having a simple or complex curved surface.

Overview of the Invention

In short, the present invention encompasses an apparatus for electrical discharge machining of a roll surface in the form in which the roll is rotated about a longitudinal axis on a non-conductive fluid reservoir. The rolls are arranged to cooperate with the electrodes driving on the roll surfaces, which provide discharge of the rolls and change the state of the roll surfaces. The electrode is cylindrical and also consists of a series of wafers or discs arranged alternately of conductive and nonconductive material arranged in a hybrid pile to form a cylindrical electrode. Current is supplied through the conducting plates. In addition, the outer surface of the conducting disks has a groove shape and is located opposite the cylindrical surface defined by the disk. As the cylindrical electrode is rotated, the dielectric fluid introduced into the gap between the roll and the cylindrical electrode flows into the cylinder groove which causes the movement of the fluid from the surface of the roll and washes off the surface of the roll processed by the electrode. The rotating cylindrical electrode of the disk is also mounted so that it can move laterally over the surface of the roll and in this way be exposed to the entire surface of the roll as the roll rotates about its longitudinal axis. The mounting arrangement for the cylindrical electrode provides three degrees of freedom of adjustment. A control circuit is provided for adjusting the direction of the electrode surface relative to the surface of the roll to be formed. Also provided is a control circuit for regulating the electrical pulse discharge from the conductive disc of the cylindrical electrode.

Accordingly, it is an object of the present invention to provide an improved discharge potential.

It is still another object of the present invention to provide an improved discharge processing apparatus comprising a special discharge electrode assembly composed of a plurality of alternating conductive and nonconductive discs forming a discharge electrode of a clay shape.

It is another object of the present invention to provide a discharge electrode composed of alternating conductive and nonconductive disks, the outer surface of which is the area of the surface to be machined as it rotates in the opposite direction with respect to the machined surface. Grooves for flushing fluid from the apparatus.

It is a further object of the present invention to provide an improved discharge preload comprising a control device for controlling discharge from a series of alternating conductive plates connected to or spaced from a nonconductive disc to form a cylindrical discharge.

It is another object of the present invention to provide a discharge device having a contrasting discharge polarity for a workpiece or roll to be processed, the electrode of which is cylindrical and also when the electrode moves transversely across the entire surface of the workpiece. It is controlled in such a way that it is appropriately maintained in the opposite manner with respect to the whole surface. The present invention is suitable for long cylindrical shafts, short cylindrical shafts, cylindrical holes, and flat or slightly curved surfaces.

It is a further object of the present invention to provide an improved and simplified discharge pretreatment that provides improved control of discharge angle operation.

These and other objects, and the advantages and features of the present invention will become apparent from the following description.

[Description of Preferred Embodiment]

In the following description, not only the specific structure of the discharge electrode associated with the discharge processing apparatus but also the means for mounting the discharge electrode and controlling the discharge from the electrode will be described in detail. Parts other than assemblies will be apparent to those skilled in the art as much as such devices are disclosed and useful in the various prior art documents described above.

1 and 2, a perspective view of the overall apparatus of the present invention is shown. The apparatus includes a reservoir or tank 10 containing a nonconductive fluid known to those skilled in the art. A roll 14 having a shaped surface 16 to be hollowed into a pattern is rotatably mounted on a suitable support 12. The roll 14 is arranged on the support mechanism 12 and connected via a shaft 15 to a driver such as a belt driver 19 which is driven by a motor 17 during machining operation, and is connected to the longitudinal axis associated with the roll 14. The journal 18 which rotates the roll 14 with the desired speed and direction with respect to 20 is included. The roll 14 may be weakly supported on the reservoir although it is at least partially immersed in the fluid 11 in the reservoir 10 during at least a portion of which the roll 14 rotates about the longitudinal axis 20.

An electrode 22 through which the current is discharged through the dielectric liquid 21 exiting the tube 23 is disposed opposite the roll 14. Current is supplied to the surface 16 of the roll 14 to be effectively processed to form the desired mat or satin pattern on the surface 16. Electrode 22 is physically mounted on mounting platform or funnel assembly 24, 24A, 81 having three degrees of freedom of control. Thus, the electrode 22 can move towards and away from the surface 16 (in the A direction). The electrode can move in a direction (B direction) parallel to the axis 20 of the roll 14. The electrode 22 can also pivot (in the C direction) relative to the protrusion 26 associated with the electrode. The protrusion 26 is generally lying on a vertical line extending upward through the axis of rotation 28 of the cylindrical electrode 22. The protrusion 26 is thus located on a line equally spaced from the opposing face of the cylindrical electrode 22.

3, 4, 5, and 6 illustrate the unique structure of the electrode 22 in more detail. 7 and 8 more specifically illustrate the components involved in the structure and control of the electrode 22 and its mounting assembly 24. Referring first to FIG. 3, the electrode 22 is generally cylindrical. The electrode 22 is comprised from the electrically conductive disk 30 and the nonconductive disk 32 arrange | positioned alternately. The discs 30, 32 are arranged in compact cylinders which can rotate about the axis 28. The non-conductive plate 32 extends toward the outer circumference of the cylinder to insulate the conductive plate 30 from each other. The conductive disks 30 include grooves 34 that form a V or herringbone shape in the array. The V-shaped vertex is in the transverse center plane of the electrode 22 as shown in FIG. 3 and faces in the opposite direction of rotation of the electrode 22 with respect to the axis 28. The opening angle 36 of FIG. 5 formed on both sides of the V-shape formed by the groove 34 is preferably less than 180 °. The grooves 34 may vary in shape, depth, and arrangement on the outer surface of the electrode 22, but are spaced at regular intervals around the outer periphery of each conducting plate 30.

As shown in FIG. 6, each conductive disk 30 is preferably connected to the electrically conductive ring 38 separately through a connector 39. Each ring 38 is connected to a power source that supplies electrical energy.

In operation, the electrode 22 is rotated by the drive about the axis 28. As the electrode 22 rotates, the passageway formed by the groove 34 provides a pumping action, in particular, to flow the non-electric fluid from the surface 16 adjacent the gap between the electrode 22 and the roll 14. . Thus, the material processed by the discharge from the conducting plate 30 quickly and easily separates from the surface 16, thereby improving the efficiency of the apparatus.

The inclined grooves 34 in the conducting disk 30 ensure that at least a portion of the motorized surface of each separate disk 30 always faces the workpiece 14. That is, the grooveless portion of the outer surface of the disc 30 between the continuous grooves 34 will always be adjacent to the surface of the roll 14. For example, some areas 42 face the surface of the roll 14 or some areas 44 always follow the surface 16 along the closest access line between the electrode 22 and the roll 14. Will oppose.

Since the groove 34 is inclined, the groove 34 alone will not face the surface 16 as a whole.

In practice, the conductive disks 30 are made of a conductive material such as brass, copper or graphite. The non-conductive plates 32 are made of an insulating material such as Bakelite or other insulating material. In addition, the non-conductive plate 32 is preferably kept as thin as possible in order to avoid gaps in the surface of the product to be processed.

FIG. 7 discloses a manner in which the rotating cylinder or electrode 22 is maintained in an efficient correspondence (in the direction C shown in FIG. 2) relative to the forming or work roll 14. One aspect of the present invention is to keep the outer periphery or surface of the electrode 22 in place to form a contact surface where the forming roll 14 is in line-to-line contact or intersect, and accordingly, the forming roll 14 It is understood that this crown shape or curved shape or complex curved shape will all have the same way. Thus, the axis 28 is nearly parallel to the axis 20 but will be slightly inclined so that the electrode 22 is properly aligned with respect to the surface 16.

In order to provide such a structure, sensors 60, 62 are connected to the outer conductive plates 64, 66 of the electrode 22 via electrical circuits. This detects, compares, and utilizes the voltage drops associated with each of the disks 64, 66 to drive the mounting assemblies 24, 24A, 81 associated with the electrodes 22 to drive the electrodes 22 to the surface of the roll 14. Keep parallel to Thus, the assemblies 24, 24A, 81 are driven to uniform the voltage drop across the disks 64, 66. Those skilled in the art will be aware of the specific circuitry and detector arrangements for achieving this.

The specific mounting structure is described as follows and illustrated in FIGS. 1 and 2. As shown in Figs. 1 and 2, the mounting assembly is subjected to three independent motions. The first movement in the direction A shown in FIG. 1 is directed to a servo-controlled hydraulic cylinder 71 which moves the platform 24 along the guide rails 73 and 75 toward and away from the roll 14. Is achieved.

The second movement in the B direction, generally parallel to the axis 20, is directed to the movement of the platform 24A on the parallel guide rails 77, 79 in cooperation with the nut and screw mechanism attached to the bottom of the platform 24. Is achieved.

The third movement direction of the electrode 22, i.e., indicated in the C direction in FIG. 2 and described in FIG. 7, has a servo control rack and pinion as shown in FIGS. achieved by pinion. Specifically, the electrode platform 81 is mounted to rotate about the axis 26 on the platform 24. The platform 81 includes a peripheral rack or gear 83 with which the pinion 85, driven by a servomotor 87, cooperates. The servomotor 87 is controlled in accordance with the description above with respect to FIG. 7.

8 illustrates another feature of the invention, namely a circuit for sending a current signal to the conducting plate 30. Specifically, the pulse control source 70, at the same time sends a signal to a plurality of timepieces (72, 74, 76) connected to the separate conductive disk 30, respectively. Each of the timepieces 72, 74, 76 delays the operation of the associated gates 78, 80, 82 by a predetermined amount, so that each energy source 84, 86, 88 control the flow of current from it. Each of the conducting disks 30 arranged separately and arranged side by side may be arranged to be sequenced, for example, the adjacent disks 30 may in turn receive current pulses. The order of pulse transmission and the selection of the sequence can be adjusted to change the electroplating pattern by adjusting the settings of the timepieces 72, 74, 76.

9 and 10, the deformation structure of the electrode 22 is shown. FIG. 9 shows a structure having substantially the same axis 28 as the structure described in FIGS. 6, 3, and 5. However, the structure of FIG. 9 shows that the width of the outer disc 30 on each side of the electrode 22 is twice as large as the width of the discs in the electrode.

FIG. 10 illustrates the manner in which the electrode of FIG. 9 is modified such that the separating discs 30 are inclined with respect to the axis 28A of FIG. The structure of the electrode shown in FIG. 10 can also ensure the uniformity of the patterned surface to be formed. It will also eliminate the unpatterned strips caused by the nonconductive space on the electrode.

While the preferred embodiments of the invention have been described herein, it is to be understood that the invention is limited only by the appended claims and equivalents.

Claims (8)

The workpiece is rotatably mounted about its longitudinal axis to cooperate with a driving electrode on the surface of the workpiece, the electrode including a tube for flowing a dielectric fluid in a gap between the electrode and the workpiece, the surface of the workpiece In a workpiece surface discharge machining apparatus for providing a discharge from the electrode to the roll to change a state to a desired shape, a plurality of alternating conductivity and vision arrangements arranged in the form of a cylinder forming one surface Cylindrical electrode 22 comprising conductive discs 30, 32: the cylindrical electrode is rotatably mounted about shaft 28 and maintains the surface of the cylindrical electrode parallel to the surface of the workpiece. Electrode mounting assembly 24, 24A, 81 comprising a projection 26 for aligning the axis 28 of the electrode parallel to the axis of the workpiece: the electrode 22 and the workpiece Surface 16 is formed in the groove which is located on a vertical line with respect to the axis 28 of the electrode holding the gap connecting the axis 28 of the workpiece axis 20 and the electrode 34, between; A pulse regulating source (70) for providing a discharge current to the conductive discs (30) and controlling the current for the discs; A driving device for rotating the cylindrical electrode; And a servo-controlled hydraulic cylinder (71) for moving the original plate of the electrode (22) laterally along the axis of the workpiece. 2. The device according to claim 1, wherein the conductive disc (30) comprises a groove (34) at the cylindrical outer surface and is provided with a tube (23) for delivering fluid to the gap as the electrode rotates. . 3. An apparatus according to claim 2, wherein the grooves (34) are straight grooves formed at an acute angle with respect to the transverse plane with respect to the cylindrical electrode axis (28). 3. An apparatus according to claim 2, wherein the grooves (34) are straight grooves forming a plurality of V-shaped grooves on the surface of the cylindrical electrode. 2. Device according to claim 1, characterized in that the electrode (22) consists of a series of conductive discs (30) and non-conductive discs (32) arranged in the same size. 2. A device as claimed in claim 1, comprising timepieces (72, 74, 76) for controlling the discharge current from each conductive disc 30, the intensity, retardation or sequence of discharge for each conductive disc. Are controlled respectively. The effective surface of the cylindrical electrode according to claim 1, wherein the mounting assembly (24, 24A, 81) for mounting the electrode has a clearance in parallel with the surface and the surface of the workpiece when the cylindrical electrode crosses the surface of the workpiece. Means for continuously maintaining the device. 2. An apparatus according to claim 1, wherein the axis (28A) of the disc is inclined with respect to the axis (28) of the electrode.

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