DE2444236A1 - CUTTING HEAD FOR OVERALL FORM MACHINING OF WORKPIECES MADE OF CARBON OR THE LIKE ON THE WAY OF MATERIAL REMOVAL. AND PROCESS FOR ITS MANUFACTURING - Google Patents

Description

PATENT LAWYERS

BRAUNSCHWEIG MUNICH

Us.Z .: 1831

Thomas John O'Connor,
Ann Arbor, Michigan, USA
100 Morgan Road

Cutting head for overall shape machining of workpieces made of carbon or the like by way of material removal, as well as a method for its production

The invention relates to a cutting head for overall shape machining of workpieces made of carbon or the like by means of material removal, as well as a method for its production. The cutting head is primarily intended to process yoil workpieces on carbon or other crumbly material. Such machined workpieces are preferably required as electrodes for machine tools that work by means of electrical or electrolytic removal or the like. An ajlcL ^ r cutting head is used to make such electrodes od.vr d ^ j. Process workpieces in an erosive way.

Processing of workpieces taking place on the way of removal has so far been carried out in a relatively uncontrolled manner Grinding, pushing, etching, engraving or the like. took place, which known methods do not result in overall shape machining and for the most part essentially none

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Deliver precision. Of course, the manual shaping with hammer and chisel could also be referred to as removal processing. However, such a procedure can only be checked in terms of accuracy by the craftsman when handling his tools manually. Even with the greatest skill of the craftsman, this method does not lead to an overall shape processing, but at most to a processing at a single point or along a single line. In a similar way, with mechanical etching and engraving, a control only takes place via the skill of the craftsman's hands, whereby practically only one point of the workpiece is worked in each case. A certain precision can be achieved by grinding, but this is not an overall form machining of the kind that is to be dealt with here in the present AiimelJur.j. Such grinding processes also take place. always only along individual lines, so that we cannot speak of totalfor :: i processing. When grinding, contact only reads along a single line between the workpiece, "1 ⁰ WiIeIf disk. This distinguishes me from the etching or engraving process or from the Eccrli-it '^ ₁ " n.it chisel, and in no case will jedooh in substantial -:; n G ^ samtkontakt between an abrasive surface doo ochhcidkopfer and a workpiece, such as boitung Dieo in Gesaihtform-Bt ur is the case..

It is the object of the invention to remedy this and one To propose cutting head with which on the way of the material

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overall shape machining of workpieces made of carbon Or the like. Can be done with the highest precision -and little time required, the cutting head being simple, but producible in different ways.

According to the invention, this object is achieved by a base section of the cutting head having a surface which is essentially the mirror image of the shape formed by Material removal is to be generated, however, the surface in the size of this shape by a predetermined The amount differs while the surface has material-removing properties. Depending on whether it is a patrix-like or a matrix-like surface shape is involved, this surface is larger or smaller than the predetermined amount the surface of the workpiece to be produced.

The mirror-inverted surface advantageously has of the cutting head has a planar or flat surface area, the dimensions of which are substantially equal to the size difference of the dimensions between this surface and the shape to be produced, this surface being essentially expands in two mutually perpendicular directions.

The cutting head can be manufactured in different ways. For example, a model with the shape that to be produced by the removal, which model differs from the shape to be produced in its size differs by a certain amount. This model

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can be done by usual processing, e.g. with one of the known methods, which work only point by point or line by line or by means of electrical discharge machining. Thereupon a mirror-image cutting head is formed over the model from a hardenable material that is an admixture of having abrasive materials. The hardenable material can be chemically or by changing the temperature or the like. After the cutting head has been molded over the model.

However, the cutting head can also be made from a large number of rods or tubes of narrow diameter, arranged parallel to each other and with one end on the Sit on the surface of a prefabricated oversized model. The rods or tubes are then in place through a binding agent is specified, which is poured over or applied to it. In this manufacturing process, the Ends of the rods can be pointed if desired. The rod ends but can also be exposed to a sandblowing process or electrical discharge processes for surface treatment. The cutting head can also be made by applying metal, e.g. aluminum, to a model of the mold, which is to be produced by machining the entire shape on the way of the removal to a mirror-image model made of relatively soft metal. Electrode material, e.g. copper, is then applied to the soft metal mirror model Syringes or the like applied to create an electrode,

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which the exact shape of the workpiece to be produced by removal having. This electrode is then used to create a mirror image of the surface using electrical discharge machining Or the like. In connection with a revolving orbital movement, which gives movement of the electrode will. Here the electrode is moved in two planes, the

run perpendicular to the direction of movement of the electrode in the direction of the workpiece during the electrical discharge machining process. Finally, the cutting head is in the shape machined by means of electroerosion, the size of which is different from that to be produced Workpiece differs by a predetermined amount, molded by casting or the like, for example with a hardenable Material which has abrasive additions.

Alternatively, the cutting head can be electro-discharge machined can either be produced directly by first producing an electrode which, in terms of its size, has the shape which is to be produced on the workpiece is different, and by a predetermined amount, the cutting head being gained by moving the electrode on a direct linear Paths into the workpiece from which the cutting head is to be made, with the help of an electrical ent-1 loads working machine. Alternatively, a model of the shape and size can first be made that corresponds exactly to the workpiece to be produced, this model being used as an electrode in a machine of the type mentioned whereupon the electrode in all directions in one

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Moving in an orbital path precisely perpendicular to the direction of immersion in order to create a surface with abrasive in the cutting head To generate properties that differ in size from the workpiece to be manufactured. Here the erosive Surface due to the normal properties of the electrical. Discharge machining received.

In such a process, it is desirable to have the Shape as an electrode for producing a cutting head to use. If this shape is not made of conductive material, a conductive material can be machined over the non-conductive Mold surface to be sprayed. The above methods can be used to produce male or female cutting heads will. When it comes to die-like cutting heads, the surface produced and removed is larger than the desired one Surface of the workpiece. In the case of a male cutting head, this surface is of a smaller size. Through the rotating orbital movement, which is generated in the removal machine, one finally obtains a surface of the desired dimensions.

The e _r invention will be explained in more detail below with reference to schematic drawings of several exemplary embodiments.

Show it :

1 shows a perspective view of a die-like cutting head according to the invention,

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Pig.2 shows a male-shaped cutting head in a similar representation according to the invention.

3 shows a cross section along the section line "3-3 of FIG. 1, Mg.4 is a cross-section along section line 4-4 of Pig.2.

Pig. 5 shows a cross section through a pin-shaped model electrode with the same dimensions as those obtained by removing the entire shape should be produced.

Pig. 6 shows a cross section through a cutting head with a mirror image Surface shape, but larger dimensions than the electrode of the Pig. 5.

Pig.7 shows a sectional view of the cutting head according to Pig.6 in its position for the surface treatment of a carbon electrode according to Pig.8;

Pig. 8 a section of the carbon electrode through the entire f Orm machining by removing means with the help of the cutting head has been produced according to Pig.7.

The Pig. Figures 9 and 12 are similar to the Pig. 5 to Pig, 8, for the production of a male-shaped cutting head with smaller dimensions compared to the workpiece to be produced according to Pig.12.

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13 shows a cross section of an oversized model for Manufacture of a cutting head from a hardenable plastic with additions contained therein with abrasive properties.

14 shows a cross section through the cutting head, which according to FIG has been manufactured and in readiness for machining a workpiece in the form of a carbon electrode, which is shown in its finished form in Fig.15.

Fig. 16 in cross section an oversized model for production a cutting head according to a modified embodiment.

17 shows the cutting head manufactured by the method according to FIG for the production of a workpiece, which is shown in Fig. 18.

19 shows a cross-section through a model, which by spraying of a soft metal leads to the production of a shape which is shown in FIG. 20 in the inverted position and in the position serves as an electrode according to Fig.21.

Fig. 22 is a cross section of an oversized mirror image Illustration of the electrode according to Fig. 21, as it is in a material intended for the cutting head by immersing the electrode according to Fig.21 in the soft material in one on the way of

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Electric discharge working machine can be generated, whereby the electrode is given a rotating orbital motion will.

Pig.23 a cross section of a molded part with oversized Work surface made with the shape according to Fig. 22 is.

Finally, FIG. 24 shows the subsequent position of the cutting head Made of hardenable material with incorporated abrasive additions.

Fig.25 is a cross section of a workpiece that is on the way of Overall shape removal machining is to be produced.

Fig. 26 shows a cross section of an oversized cutting head for the workpiece shape to be machined according to FIG. 25, the cutting head made of hardenable material with abrasive additions consists and wherein the material is cured while the shape to be produced engages in the material and thereby in rotates in an orbital motion.

Fig. 27 shows a cross section through an oversized cutting head according to Fig.26 in a position in which on the way of the overall shape machining the carbon electrode according to Figure 28 is made by removing material.

■ pig.29 a cross section through another modified one

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Cutting head with oversized dimensions and'on his Abrasive material applied to the surface, and

Fig. 30 shows a cutting head with oversized work surfaces, which are impregnated with an abrasive material.

As can be seen from FIGS. 1 to 4, the invention relates to cutting heads for removal machining according to the invention, which may have either a die-like or a male-like shape, as shown at 10 in Pig. 1 or * M 12 in FIG. In the case of a die-like cutting head 10, a recess H with a mirror-image surface to a male mold, which is to be produced by ablation in the cutting head body 16 provided. In the case of a male-like cutting head 12, a projection 18 with a mirror image shape is a matrix-like electrode, which is to be produced by means of the removal of material, on the cutting head body 20 intended"

The recess 14 in the cutting head 10 is oversized in its dimensions and that in planes parallel to the opening, the thereby in the surface 21-is generated, these planes are shown by the arrows 22 and 24, which are essentially perpendicular to one another, in FIG 26, which is indicated in Figure 3, the surface is the same Dimensions like the male electrode that comes with the cutting head is to be produced. The surface 28 of the recess 14 has abrasive properties with respect to a

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Crumbly material, such as carbon or other materials used as electrodes for machining workpieces on the Ways of electrical discharge machining or the like. Are required.

In addition, the cutting head 10 is provided with a centrally located flat or planar surface area 30 on the work surface 28 provided. The flat surface portion 30 is circular due to the hemispherical shape of the shape that is on the way of removal by means of the cutting head 10 is to be produced, the cutting head in this case in an orbital path rotates. The cutting head is in an overall shape removal machine assembled.

The projection 16 on the cutting head 12 is underdimensioned, specifically in the directions indicated by arrows 32 and 34 are and compared to the exception in the carbon block or the like. To be machined with the cutting head, In the However, in the direction indicated by the double arrow 36, the projection 18 has the same size as the recess to be produced. Here, too, the surfaces of the projection 18 are made of abrasive material and comprise a flat section 38, the is required, due to the rotational movement in an orbital path which is in the plane of the surface 38 when the cutting head 12 is installed in a processing machine of the type in question.

As can be seen from FIGS. 3 and 4, the cutting heads 10 are white

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and 12 have dovetail sections 40 and 42, respectively, which may be bolted or otherwise attached, for example in the manner shown in US Pat. No. 3,497,930, so that cutting heads 10 and 12 can easily be electrically operated _e machine tool, in particular its ram or its plate, can be assembled with great ease and in a precise position »

In operation, the cutting heads 10 or 12 can be incorporated into a whole shape processing machine are used, with a rotating movement of an orbital path in the direction of arrows 24 and or in the direction of arrows 32 and 34 while approaching the workpiece, a carbon block or the like. The movement in the direction of the workpiece, that is to say in the direction of the arrows 26 and 36, takes place under a pressure of, for example 24 kg / cm of the surface to be processed. During the removal process, the cutting heads 10 or 12 are pulsating moved, i.e. they are periodically lifted from contact with the workpiece, i.e. in the direction of arrows 26 and 36, respectively.

This should make it easier to flush the area between the cutting head and the workpiece. The rinsing process is carried out through the openings 44 and 46 in the cutting heads 10 and 12, as well as

on

through membranes 48 and 50, as in the flushing of / electrical Way working machines is known.

A light oil, e.g. kerosene, or a Water can be used. However, any other liquid can also be used that will remove the removed particles.

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washes or washes away and shows no appreciable reaction with the cutting tool or workpiece. The rinsing process can but can also be done with air or other gases. Finally, purging could also be done by creating a vacuum in the area between the cutting head and the workpiece. The cutting heads 10 and 12 can be made in various ways different materials can be made.

As shown in FIGS. 5 to 8, a model is first created 60 generated, which consists essentially of a hemispherical section 45 on a flat base body 47 and for example is made of carbon in the exact size shown in Figure 5. This model is called an electrode used in a machine operating by means of electrical discharges and used to create a recess 52 in a To produce steel block 54 by removing the material by electrical means. The recess 52 is the same as the recess 28 insofar as it is oversized in two mutually perpendicular directions in the flat surface 56 of the steel block 54 and has a circular, flat surface area 48, which due to the Sotier along a orbital path of the model 60 arises in the processing machine, either during or after the movement of the model 60 perpendicularly into the steel block 54 for the production of the recess 52. Such a recess takes place by means of electrical discharges Machining process creates a surface 58 in recess 52 which is typically cellular and therefore has erosive properties by itself.

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After manufacture, the steel block 54 is rotated with the recess 52 in the position according to Figure 7 and fastened it in a general shape processing machine over a workpiece in the form of a carbon block. Then the cutting block.57 »the was obtained in this way, in the direction of the carbon block, so moved in the direction of arrow 60a in Fig.7, while the cutting head is rotated along an orbital path in the plane of the surface 62. Here you get a carbon electrode 64, which is the same size and shape as the original model 60, provided the orbital path for the cutting head 54 is the same as the orbital path of the model 60 when the recess 52 is created in the cutting head is subjected. Due to the relatively high hardness of the steel cutting head and the low hardness of the carbon, from which the electrode 64 consists, the cutting head 54 can be used to cut a considerable number of τοη carbon electrodes 64 before the cutting head has to be machined again.

It can be seen that the flushing holes in the cutting head 54? if desired, can be drilled in, and manifolds and connections such as manifolds 58 on cutting head 54 and the connecting portions 40 and 42 of the cutting heads 10 and 12 can be attached. This also applies to the ones below described embodiments *

A similar process for making a male cutting head shown in Figures 10 and 11 is shown in FIG

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9 "to 12. For this purpose a matrix-shaped Carbon electrode 82, which is to be copied exactly, first used to be on the way of the electrical Discharge to process the material of the cutting head 68 so that this one projection 70 and one of the electrical Cell-shaped surfaces 72 originating from discharges and a flat portion 74 is given.

The cutting head 68 made of steel is used, when supplemented by the devices described above, to to machine a carbon block to produce a matrix-shaped carbon electrode 80 as shown in FIG and which is an exact copy of the initially used electrode 82, provided that the cutting head 68 is machined of electrode 80 travels the same orbital trajectory as electrode 82 during manufacture of cutting head 68.

Should the original model 60 or the electrode 82 not be electrically conductive, a thin, conductive surface layer can be used spray on or spray on before manufacturing them as electrodes in electrical discharge machining of the S-j-ahlschneidkopfes 54 or 68 can be used. For example a layer of aluminum or copper can be sprayed on.

In the event that in the manufacture of the cutting heads 54 or 68 wants to dispense with the orbital path of the electrode, one can use the initial model 60 or the initial electrode

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82 can also be produced oversized or undersized in another way, e.g. by molding or metal cutting or the like. In this case, the cutting heads 54 or 68 by a linear immersion movement of the electrode in the direction of generated the steel block.

In the Pig. 13 to Pig. 15 is a die-shaped cutting head 84 made by molding from a hardenable material 86 in which abrasive material 88 is distributed. The shaping takes place over an oversized model 90 compared to a workpiece to be made on the overall mold machining. The oversized one Model 90 can be manufactured in any known manner, e.g. B. by way of electrical discharge machining, shaping, surface treatment and the like. Be made. It is of course desirable that the oversized model 90 is made of an easy-to-work material, so that the oversized model can be made with the least amount of time and the to be able to produce the smallest expenditure of energy.

The hardenable material can be any material that hardens sufficiently to form a relatively hard cutting head, without significant shrinkage, such that the cutting head maintains the desired shape according to the model 90. An epoxy resin with a filler, such as sand or the like, can be used as the hardenable material 86. However, it can also be a metal, for example aluminum or the like.

The epoxy resin can be determined by molecules represented by the

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Presence of epoxy or epoxy groups are characterized. A group of the last-mentioned resins are glycidol ethers of Polyhydrides, phenols, e.g. di-glycol ethers of biphenol-a. Other Groups of epoxy resins suitable for use in the present invention are those groups identified as epoxylated novolak resins "are known. Further information on these Resins can be found in U.S. Patents 3,394,105 and 3,434,087.

The abrasive material can be selected from a large group of such materials, e.g. from lubricant gel, carbide chips, Glass, industrial diamonds or the like. Also, the material to be removed does not need over the entire cross-section of the hardenable Material can be distributed, but can also only be provided near the work surface in the region of the recess 92.

In operation, the cutting tool 84 is similar to Fig. 6 in FIG an overall shape removal machine placed over a carbon block or the like and moved along an orbital path to to produce a carbon electrode 92a as shown in Figure 15 and whose desired shape is smaller than the oversized recess 92. The difference is equal to the displacement movement, imparted to electrode 84 at its orbital trajectory.

The cutting head 94 according to FIG. 17 is made up of a large number of individual ones cylindrical rods or tubes 96 of small diameter

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ser produced, the sharpened ends 98 to the abrasive Form surface 100. This surface is overdimensioned in relation to an electrode 102 to be produced with the tool in two dimensional directions, while the dimension in the direction perpendicular thereto is the same as that relevant dimension of the electrode 102. The surface 100 again has a flat area in the center, which is in the Orbital movement of the cutting head 94 ensures an exact shaping of the surface of the electrode 102. The steel pins 96 are rigidly held together by a filler material such as lead, white metal, epoxy resin or the like. When making the Cutting head 94, the rods 96 are over a model 106, the is oversized, aligned, with the pointed ends attacking the model and recreating its contour, like this Fig. 16 shows. The rods 96 are then locked in place by pouring the filler material into those between the cylinder rods remaining openings set. When the filler material has hardened, e.g. by hardening or by cooling, the surface becomes 108 processed in such a way that the cutting tool is attached to a processing machine after being removed from the molding box 110 can be. The oversized model 106, in turn, can be manufactured in a variety of ways.

Fig. 19 shows a model electrode of the exact size as it is desired on the way of the overall shape machining, placed in a box 114 and a mirror-image die shape 116 is sprayed onto the model 112. The most mirror image sprayed on The model can be aluminum, for example.

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The mirror-image model made of aluminum is then reversed and inserted into a box 118 and an electrode model 120 formed by spraying onto the aluminum model. A separator can be used between the aluminum model and the electrode model be used. The electrode model can, for example, also consist of sprayed-on copper. The copper electrode model 120 is then oscillating in a rotating machine in a machine operating on the path of electrical discharge Movement in the position according to Pig.21 used to make an oversized female mold 122, e.g. made of aluminum or other metal that can easily be machined in this way.

The oversized female die-like model 122 is then placed in a box 124 and a male-shaped oversized one Model 126 shaped. This can be made of any suitable material such as white metal or the like. This The male pattern 126 is then placed in a box 128 and an oversized die-shaped cutting head 130 molded over the model 126. The cutting head 130 is made of a hardenable material such as epoxy resin and has abrasive impurities 132 distributed therein. The patrix-shaped Model 126 and Aluminum Model 122 can be multiple to produce an essentially unlimited number of Cutting heads 130. can be used again. .

In the method for manufacturing cutting heads according to fig.

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25-28, a model 136 of the electrode part that is to be produced is lowered in the direction of the box 138, which is filled with hardenable material HO and embedded abrasive material 132, while the hardening Material HO is in the process of curing. At the same time, the electrode model 136 is rotated along an orbital path, such as what has already been described above, around a matrix-shaped recess 144 in the cutting head 146 to be generated.

The recess 144 is oversized in two directions and has a flat portion 148 so that the cutting head is suitable for making a graphite electrode 150 with dimensions identical to the dimensions of the model 136 by removing the graphite after the cutting head 146 has been removed from the box 138 and in the reverse position installed in a corresponding machine tool according to FIG has been. During the machining of the carbon electrode 150, the cutting head 146 is also given a rotating orbital movement in addition to its approaching movement towards the workpiece.

The hardenable material HO can be one of the materials mentioned above and can be made by cooling the box 138 'for example with the aid of a cooling coil 152 or by applying heat to the Box 146 can be cured by a heating element 154 or by other means.

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As shown in FIG. 29, a corresponding cutting head 160 can also be produced by using quartz 162 or the like. Abrasive materials, e.g. lubricating gel mixed with an adhesive, sprayed over an oversized model that is applied has been made in some known manner. Also, an adhesive can first be attached to the model and the ablative Model can be sprinkled or sprayed, whereupon the adhesive material can be solidified.

In fig. 30 an oversized cutting head 164 is shown, formed by rolling or forcing abrasive material, e.g., lubricating gel, into a relatively soft body 166 Has been made, for example, of light metal or the like. The roll 168 is used for rolling up.

Claims

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Claims (1)

Claims Cutting head for material removal on the way Overall shape machining of workpieces made of carbon or the like., In particular carbon electrodes, gekennzeichn et by a base portion having a surface which is substantially the mirror image of the shape which is to be generated by material removal, but differs in size therefrom by a predetermined amount, wherein the surface has material-removing properties. 2. Cutting head according to claim 1 for producing a male-like Mold, characterized in that the material-removing surface is of a die-like shape, opposite the male-like shape, however, has larger dimensions. 3. Cutting head according to claim 1, characterized in that for producing a die-like Workpiece is the material-removing surface of male-like shape, compared to the matrix-like shape of the workpiece but has smaller dimensions. 4. Cutting head according to claim 1 to 3, characterized in that the to be produced by material removal Shape of the workpiece is three-dimensional. 509812/0861 5. Cutting head according to claim 4, characterized in that the tool surface according to its size in at least one dimension of the mold surface to be produced deviates. 6. Cutting head according to claim 4 or 5, characterized in that g e k e η η ze i c h η e t that the size differences are present in at least two dimensions that are essentially perpendicular to one another. 7. Cutting head according to claim 1 to 6, characterized in that the abrasive surface of the tool has a flat surface area that divides into two im essentially perpendicular to each other, extending essentially over a distance that, in terms of size, corresponds to the dimensional deviation. '8th. Cutting head according to Claims 1 to 7, characterized in that the cutting head consists of metal and the abrading surface is produced by electrical discharge machining. 9. Cutting head according to claim 1 to 7, characterized in that the body of the cutting head consists of a curable plastic, which is impregnated with abrasive material at least in the area of the tool surface. ..0. Cutting head according to claims 1 to 7, characterized in that g e k e η η - 509812/0861 shows that the sciineid head consists of a multitude of parallel rods or the like. Of small diameter, which are held together by a binding material to form a block and the ends of which form the abrasive surface of the tool. 11. A method for producing a cutting head according to claim 1 to 10, characterized in that a surface in a body made of rigid material is approximately mirror-inverted Shape is produced to the desired shape of the workpiece and in dimensions that differ from those of the desired Differentiate shape by a predetermined amount. 12. The method according to claim 11, characterized n e t that a flat surface area is created on the working surface of the cutting head with dimensions that are the same the difference in the size of the dimensions between the cutting head and the workpiece shape to be produced. 13. The method according to claim 11 or 12, characterized in that g e k e η η draws that the cutting head is oversized in relation to the shape to be produced, the oversizing receives a predetermined amount. 14. The method according to claim 11 or 12, characterized in that the cutting head is undersized in relation is made to the shape of the workpiece, the undersizing receives a predetermined amount. 509812/0861 15. The method according to claim 11 to 14 »thereby g e k e η η ζ e ic line t that the cutting head is formed over a shape which essentially has the shape of the workpiece shape, which are generated on the way of the overall shape processing target. 16. The method according to claim 15, characterized in that the cutting head is made of a hardenable plastic is produced, in which previously small particles of an abrasive material at least in the area of the work surface available. 17. The method according to claim 16, characterized in that the cutting head is made of an epoxy resin will. 18. The method according to claim 16 or 17, characterized in that at least one abrasive material Material is selected from the following group: lubricating gel, silicon, glass, carborundum, norbide, carbide or industrial diamonds. 19. The method according to claim 11, characterized in e t that the cutting head is made from a plurality of rods chosen to be small in diameter and parallel are arranged to each other over a mold that is similar to the shape that corresponds to the workpiece to be manufactured and 509812/0861 -26- 244A236 differ in size from this by a predetermined amount, whereupon the rods or rods aligned in this way in their position by a hardenable or sets solidifiable binder. 20. The method according to claim 19 »characterized by chn e t that lead, tin, zinc, zamack, kirksite, white metal, babbitt or other cements are used as binders. 21. The method according to claim 11, characterized e t that the cutting head is made by placing a soft and easy-to-work metal on a model sprayed with the dimensions of the workpiece to be produced to form a mirror image of the shape that one an electrode material is then sprayed over the mirror image in such a way that an electrode is obtained for an ablation process, that you cut out an oversized electrode in a metal that can be easily machined by electrical discharge machining with the help of the previously prepared electrode that a casting mold can be made from the oversized mold and that finally the cutting head is made of a hardenable material with abrasive particles over the mold forms. 22. The method according to claim 21, characterized e t that the lightly worked metal is aluminum. 509812/0861 -27- 24U236 23 · The method according to claim 21 or 22, characterized in that g e k e η η ζ e i ch net that the sprayed electrode material is copper is. 24. The method according to claim 21 Ms 23, characterized in that that the hardenable material is an epoxy resin and the working material is silicon. 25. The method according to claim 11, characterized in chn e t that the cutting head is made by means of electrical discharge. 26. The method according to claim 25, characterized in that during the machining of the cutting head by means of electrical discharges the electrode and the workpiece are brought closer to one another in a straight line. 27. The method according to claim 11 and 26, characterized in that that in the case of surface machining on electrical discharge paths, in addition to the linear approach movement, a rotational movement along an orbital path is perpendicular the approach movement is performed. 28. The method according to claim 11, characterized in that the hardenable material is a plastic and as abrasive material sand is used. 5 0 9 8 12/0861 29. The method according to claim 28, characterized in that the cutting head is made oversized
namely by molding over an oversized material, 30. The method according to claim 29, characterized in that the oversized cutting head while generating a rotating movement along eggs
orbital trajectory of the mold during curing of the hardenable
Material is generated. P / K 509812/0861 Blank page