FR2585733A1 - ELECTROLYTIC PROCESSING ARRANGEMENT OF PROFILE PARTS - Google Patents

Abstract

THE OBJECT OF THE INVENTION IS AN ARRANGEMENT FOR THE ELECTROLYTIC TREATMENT OF PROFILED PARTS. AN ELECTRODE IS USED WHICH HAS PREVIOUSLY SERVED AS A MACHINING ELECTRODE BY SPARKS DURING THE MANUFACTURING OF THE PART TO BE TREATED 3 OR OF ITS TOOL. SINCE PART 3 AND ELECTRODE 4 HAVE MUTUALLY ADAPTED SHAPES, UNIFORM SPACING MAY BE ADJUSTED DURING THE TREATMENT, OR A UNIFORMITY OF THE VALUE OF THE ELECTRIC FIELD IN THE BATH AND HOMOGENEOUS TREATMENT. ELECTROLYTIC TREATMENT OF PARTS WITH RECESSED PARTS.

Description

The present invention relates to an installation

  for the electrolytic treatment of profiled parts.

  In this submission, the phrase "

  electrolytic "indicates the deposition of galvanic

  electrolytic polishing, passivation and

  sometimes the electrolytic dissolution of the applied layers.

  The technique of electrolytic treatment

  has been known for several decades and an

  In general, the electrolysis process comprises the following main parts: an electrolysis vessel or vessel of appropriate size, the electrolyte in the vessel, the workpiece immersed in the electrolyte, a direct current source one pole is connected directly or via a support to the workpiece and an electrode connected to the other pole of the DC power source. In addition to these main parts, temperature regulators are frequently used to maintain the bath temperature at a suitable value: current and / or voltage stabilizers and regulators for setting and / or stabilizing the current or the electrolytic voltage; and also vacuum cleaners to remove various substances in the form of vapors

produced during electrolysis.

  The term "profiled parts" refers to objects having a hollow or zig-zag surface profile because of which the force of the electric field established during the electrolysis between the workpiece and the electrode varies considerably along the surface. both in value and direction. Such profiled parts are in particular different parts of spectacle frames, for example the nasal support,

  the bracket of the branches and the frame of the glasses

  you herself. In the electrolytic treatment of profiled parts, difficulties frequently arise because in the case of partially covered or inaccessible surfaces because of the electric screen effect of the edges close to the recessed parts, the intensity of the field is minimal and low rates of deposition are thus obtained. The desired thickness deposit can be obtained only if the other (non-screened) areas receive a much thicker layer than is necessary. This results in an increase

  time, energy and material needed.

  This phenomenon is a problem in the case not only of electrolytic deposition but also of electrolytic polishing. In the production of metal spectacle frames, the superficial brightness of the tools used in the manufacture must exceed a predetermined high value and it can be conveniently obtained.

  shine by electrolytic polishing of tools.

  The mechanical polishing of defined surfaces in cavities, internal edges and angles poses difficult technical problems. Similarly, the electrolytic polishing of such areas can not be solved. ; satisfactorily because of the limited depth diffusion properties of conventional electrolytic installations, or else these polishing processes

  require a very long-term treatment.

  The subject of the invention is an installation

  electrolyte that can provide electrolytic

  uniform pattern of profiled parts without the need for excessive precautions and without creating special difficulties in

course of use.

  The invention is based on the fact that

  profiled parts, especially tools, are frequently

  manufactured using a spark machining technique.

  lage. During this technique, a spark machining electrode is used, one surface of which corresponds to the negative of the profile to be given to the surface of the workpiece, and the dimension of the electrode is smaller than that of the workpiece of the value of the workpiece. burst distance used in the spark machining process. In general, the copper or copper electrode is made and, after the spark-machining process, either the electrode is no longer used, or, if several pieces are prepared, the electrode is discarded after have reached a given erosion. If, according to the invention, the otherwise unusable spark machining electrode is employed as an electrode during the electrolytic treatment of a part previously fabricated by this electrode, which is immersed in an electrolytic bath, then spacing can be obtained. uniformly between the corresponding surfaces of the electrode and the workpiece, and the intensity of the electric field between the workpiece and the electrode is uniform, which has the effect of regularly distributed electrolysis

  over the entire surface of the profiled piece.

  It is preferable that the spacing between the shaped piece and the adapted electrode is lower than

  at 1 mm and, particularly preferably, this space-

is about 0.1 mm.

  It is also preferable that the electro-

  lyte present in this space is intensely

  circulation using a pump and filtered.

  The circulation of the electrolyte improves the movements

  ions, prevents any unwanted deposits, ensures cooling

  enough electrolyte and helps to achieve

uniform electrolysis.

  According to the invention, the spark-machining electrode which is otherwise useless and generally discarded, still plays an important role in the manufacturing process and this new use

  noticeably improves and the efficiency of the electro-

  lytic. The installation according to the invention will be described with reference to a preferred embodiment with reference to the appended drawing, the single figure of which is a general diagram.

  of the installation according to the invention.

  The installation. represents in the drawing comprises a tank 1, an electrolytic bath 2 in this tank, a workpiece 3, an electrode 4 surmounting the workpiece 3, a supply of direct current connected to the workpiece 3 and to the electrode 4, a pump 6 to circulate the bath electrolyte and a positioning unit

  7 to adjust the precise position of the electrode.

  In the upper surface of the piece 3, are formed a first hollow 8 of the largest size and a blind hole 9 ending in this hollow. The purpose of the manufacturing process is to perform

  a uniform electrolytic treatment of the room 3.

  Part 3 (or the tool used to manufacture this part3) was previously manufactured by a spark machining technique. The electrode used during the process

  machining is the same as electrode 4 used for electro-

  lysis. The positioning unit 7 provides a uniform spacing between the surface of the workpiece 3 and the electrode 4. In the electrolytic treatment, a current is established by the direct current source 5 between the workpiece 3 and the electrode, with the intensity necessary for the electrolytic treatment, and the electrolyte is intensely circulated during the treatment. The effect of the electrolytic treatment is uniform over the entire surface of the

  Exhibit 3 and in those parts of the surface that were

  ficiles to be treated electrolytically using a conventional technique; for example, on the surface of the blind hole 9, a layer of sufficient quality is formed or, in the case of electrolytic polishing, the brightness of the surface reaches the required value; during this process, the material consumption is

  the time required for treatment is sensi-

  shorter than in conventional techniques.

  These advantageous properties are obtained because in

  the installation used by the invention, it is noticeable

  the in-depth dissemination of the electronic treatment

  lytic. It is perfectly possible to use the installation according to the invention for polishing tools. If the piece 3 is a tool steel tool made by spark machining using the electrode 4, then polishing of the tool can be performed by the assembly shown in the drawing. Such an electrolytic polishing process is described for example in Hungarian Patent No. 178066 and this method is perfectly usable in this case. The electrode positioning unit 7 serves to adjust a gap of about 0.1 mm or less between the electrode 4 and the workpiece 3, and the pump 6 is used to circulate the electrolyte at an intensity of

  at least enough so that the electrolyte in the space-

  completely renewed ten times a minute.

  A filter is used to remove loose particles from the workpiece during electrolytic processing; thus despite the exiguity of the spacing, the establishment of a short circuit between the piece 3 and the electrode is prevented safely. The current density is normally 2.5 to 10 A / dm 2. As a result of the electrolytic polishing, a uniform gloss of the entire surface of the workpiece 3 and a subsequent mechanical polishing are obtained.

is therefore useless.

  The use of the arrangement according to the invention

  It is not limited to any type of electrolytic treatment and can be used in all types of electrolytic processing of shaped parts.

Claims (3)

  1. Electrolytic treatment plant   of profiled parts, which includes a tank, an electronic bath   in the bath, a workpiece immersed in the bath, an electrode also immersed in the bath and a direct current source connected to the workpiece and the electrode, characterized in that said electrode (4) is the one uses as a spark-machining electrode during manufacture of the workpiece or its tool by a spark-machining technique having a shape that adapts negatively to that of the workpiece (3) and in that a substantially uniform spacing is defined between the adapted surfaces of the electrode (4) and the piece (3).   2. Installation according to claim 1, characterized in that the electrode (4) is coupled to a positioning unit (7) for adjusting said spacing,   this spacing being less than 1 mm.   3. Arrangement according to claim 1, characterized in that it comprises a pump (6) for circulating the closed loop electrolyte and a filter mounted in this loop.