RU2640689C1 - Method of items electrical discharge machining with wire tool electrode - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to the electrical discharge machining (EDM) of the enhanced accuracy geometrically-complex items. The method comprises the item surface forming on-machine with the CNC by means of the movement of the wire TL with the correction of the TL angular tilt α of the wire TL by virtue of the displacement of the upper guide of the mentioned machine tool cramp when directing the TL feed into the working zone from the bottom up or of the displacement of the bottom guide of the machine tool cramp when directing the TL feed into the working zone from up to down towards the item lateral surface, which is under form formation, perpendicular to the TL moving direction by an amount C, mm: C=b⋅tg(α), where b - is the item thickness, mm; α - is the exactable tilt angle of the item lateral surface, which is under form formation, deg. After the EDM of the item with the male lateral surface one carries out the additional displacement of the mentioned upper or bottom guides of the machine tool cramp to the opposite direction towards the item male lateral surface perpendicular to the TL moving direction for the remachining of this lateral surface along the same trajectory by an amount C1, mm:C1=2⋅C.

EFFECT: simultaneous obtaining of two items in the shape of the punch and matrix with the true-vertical lateral surfaces.

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Description

The invention relates to the field of mechanical engineering, instrument making, in particular to electrical discharge machining (EEO) of high precision products (for example, matrix and die tools, copiers, templates, patterns, tools for planting and extruding with surfaces of almost any configuration and from any conductive materials ) wire electrode-tool (EI) on EDM cutting machines with CNC.

A known method of EEE of products, including the shaping of a given surface of the product on an EDM cutting machine with CNC due to the coordinated coordinate movements of the wire EI along the path defined by the control program (UP), with the correction of the angle α of the _{EI of the} wire EI by shifting the upper guide of the tool clamp of the said machine when the direction of supply of EI to the processing zone from the bottom up or the lower guide of the tool holder of the machine with the direction of supply of EI to the processing zone over down towards formoobrazuemoy side surface of the article perpendicular to the direction of motion at an ee value of C, mm C = b⋅tg (α), where b - Thickness, mm; α is the expected slope of the lateral shaped surface of the product, degrees (see Patent RU 2467842 C1, IPC V23N 7/06. Method of electrical discharge machining of products with a wire electrode tool. / DV Kravchenko, A.O. Ulanova. - No. 201120708 / 02; Declared May 20, 2011; publ. 11/27/2012 Bull. No. 33).

The reasons that impede the achievement of the technical result indicated below when using the known method include the fact that in the known method, when EEE is implemented, wire EI ensures vertical alignment of the side surface and eliminates the expected slope α of this side surface only for the punch (product with a covered side surface) while the opposite lateral surface of the matrix (the product with a covering lateral surface) is formed in the presence of an unacceptable slope α, i.e. there is no vertical alignment of this side surface, which is a disadvantage inherent in the known method of EEE wire EI.

The essence of the invention consists in solving the problem of developing an EEE variant by wire EI, the practical implementation of which will eliminate the likelihood of slopes α of the lateral shaped surfaces of the punch and die, i.e., when EEE wire EI simultaneously, as part of the technological operation, get two products (punch and matrix) with strictly vertical side surfaces.

EFFECT: simultaneous, within the framework of a technological operation, provision of a given accuracy of dimensional EEO of products (punch and matrix) by wire EI.

The specified technical result in the implementation of the invention is achieved by the fact that in the known EEE method of products by wire EI, the formation of a given surface of the product is carried out on an EDM cutting machine due to the coordinated coordinate movements of the wire EI along the trajectory specified from the control unit, with a correction of the angle of inclination α _{EI of the} wire EI by shifting the upper guide of the tool bracket of the said machine with the direction of supply of EI into the treatment zone from bottom to top or lower guide s machine tool bracket with a feed direction EI treatment zone downward toward the side surface formoobrazuemoy articles perpendicular to the direction of motion at an ee value of C, mm C = b⋅tg (α), where b - Thickness, mm; α is the expected slope of the lateral shaped surface of the product, deg.

A feature of the proposed method is that after the EEE of the product 1 with the covered lateral surface 2 (punch) wire EI 3 carry out an additional displacement of the upper guide 4 of the tool holder 5 of the machine when the direction of supply of EI 3 into the processing zone from the bottom up or lower guide 6 of the tool holder 5 the machine when the direction of supply of EI 3 into the processing zone from top to bottom in the opposite direction 7 to the covering lateral surface 8 of the product 9 (matrix) perpendicular to the direction 10 of EI 3 movement for repetition the machining of this side surface 8 along the same path 11 by the value C1, mm: C1 = 2C (Fig. 2).

In FIG. 1, 2 shows a technological sketch of an EEE by wire EI 3 according to the proposed method, which can be implemented on the basis of any of the EDM machines with a contour CNC system when operating a linear circular interpolator (AGIECUT 200, ROBOFIL 4020, FANUC ROBOCUT α - liC, etc. ) in the following way.

A blank in the form of a plate 12 made of conductive material is mounted on a table 13 of an CNC erosion cutting machine and secured with a gripper 14. After immersing the blank 12 in a bath with a dielectric working fluid (not shown conditionally) and setting the necessary parameters of the electric processing mode from the pulse generator , rewinding speed v _EI and tension force F _{EI of} wire EI 3, from UE taking into account correction for the angle of inclination α _{EI of} wire EI 3 due to the displacement of the upper 4 or lower 6 tool guide machine staples 5 for the required amount C in the direction 10, indicated by arrows in view A, with a given feed speed Vs specify the coordinated coordinate displacements along the X and Y axes along trajectory 11 by wire EI 3 to shape the product 1 with covered side surface 2 (punch) . This ensures the alignment of the side surface 2 vertically and eliminates the expected slope α of this surface 2 (section BB). Upon completion of the EEE of the product 1 (punch) and its loss from the processing zone from the unitary enterprise, an additional displacement of the upper 4 or lower 6 of the guide tool clamp 5 of the machine is carried out by an amount C1 in the direction 7 to the covering side surface 8 of the product 9 (matrix) and in the direction 10, indicated by arrows B, re-treat the surface 8 along the same path 11. Thus, the final shaping of the product 9 with the covering lateral surface 8 (matrix) is realized and this side is aligned howl surface 8 vertically and wound expected slope α of the surfaces 8 (section F-G).

As a result of the EEE, wire EI 3 simultaneously, in the framework of the technological operation, two products are obtained (punch 1 and matrix 9) with strictly vertical side surfaces, respectively 2 and 8.

Claims (1)

A method of electroerosive processing (EEO) of a workpiece with a wire electrode tool (EI) to obtain products in the form of a punch and a matrix, including forming a given surface of the product on an EDM cutting machine due to the coordinated coordinate movements of the wire EI along the path specified by the control program (UE) , with the correction of the inclination angle α _ee EI wire by displacing the upper guide rail of said machine tool bracket with a feed direction in EI CNI processing zone at the upward or lower guide of the tool holder of the machine with the direction of supply of EI into the treatment zone from top to down in the direction to the formed lateral surface of the product perpendicular to the direction of movement of EI by C, mm: C = b · g (α), where b is the thickness of the product, mm ; α is the expected slope of the lateral shaped surface of the product, deg. after EEE wire EI products with a covered side surface in the form of a punch carry out an additional displacement of the upper guide of the tool holder of the machine in the direction of supply of EI into the treatment area from the bottom up or the lower guide of the tool holder of the machine in the direction of supply of EI into the treatment area from top to bottom in the opposite direction to the covering lateral surface of the product in the form of a matrix perpendicular to the direction of movement of the EI to reprocess this lateral surface according to the same raektorii by an amount C1, mm: C1 = 2 · C.

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