DD208379A1 - DEVICE FOR THE SAME CHROMISATION OF TWO FLANKS OF PISTON RODS - Google Patents

Abstract

The invention relates to an anode device for simultaneous hard and Poroesverchromung both flanks in mutually parallel annular grooves of pistons in power and working machines, wherein the piston is introduced horizontally into the chromium electrolyte. The object of the invention is to chromed both sides of Ringnutflanken of pistons in one step at the same time, with a gleichmaessige layer distribution on the surfaces to be chromed is to be guaranteed. This is inventively achieved in that an anode of non-soluble material protrudes centrally into the groove and outside the groove on both sides of bent electr. conductive flat material for power supply. u. clamped to the stiffening u. both on the back softly is looted u. so forms an anode half ring. The anode half. be by means of bolts, Distanzhuelsen u. Spacers connected to adapted anode shells. Both anode shells are connected with clamping plates electrically and mechanically, self-holding on the piston. Fields of application of the invention are pistons of larger diameter in power and working machines.

Description

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Title of the invention

Device for the equilateral Yerchromung both planks of piston ring grooves

Field of application of the invention

The invention relates to a device for simultaneous hard and Porösverchroinung both planks in mutually parallel Hingnuten of Solben bsi power and work machines of larger diameter with horizontal introduction of the piston in the chromium electrolyte.

Characteristic of the known technical solutions

In order to keep the wear occurring on the Ringnutflanken or on the seated in the annular piston rings by settling oil carbon as low as possible, the Ringnutflanken are hard or porous chromed in pistons of power and working machines.

In the currently known anode arrangement, three variants are to be distinguished.

According to DAS 1,055,913, the piston is introduced vertically, that is, the Eingnutflanken horizontal to Slektrolytcberfläche in the chromium electrolyte. The auxiliary anodes protrude either as Sinsalanoden or arranged as an anode package like a comb into the Hingnuten. The anodes are arranged one above the other.

During the annealing process, either the auxiliary anode is moved on a circular path around the fixed piston, or the sol is set about its longitudinal axis in a uniform rotational movement, wherein the anode package is rigidly secured. By the movement of the piston or the anodes should be possible a uniform coating thickness distribution.

Decisive salmon part of this variant is above all the required very high plant entecbnisehs effort to ensure the absolutely necessary constant 'running accuracy. Sin further Hachteil consists in the finite size and thus the mass of the piston · to achieve the necessary running accuracy. Due to the evolution of hydrogen only the respective lower hat flank of the hats can be chromed.

In a second variant, in which the piston is also introduced vertically into the chromium electrolyte, a multi-part anode device is used. The anode segments are attached to the vertical power supply lines. In each case two current supply are attached to an anode segment, and the divided anode segments are arranged to form a circular ring.

The Anodensegmante lie in the hat except center electrically isolated on the upper plank of the hat.

Due to the hydrogen evolution, only the lower flanks of the hat can be chrome plated, ao that the double machine base and a much higher insulation costs compared to the submitted invention are the result. This variant according to patent W? C 25 D / 205 832 can only be operated with soluble anodes for mechanical reasons. By replacing the worn anodes is compared to the submitted invention, a high preparation effort, and the chromium electrolyte is enriched with unwanted Frerüdstoffen.

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The many necessary detachable electrical connections in this variant do not ensure a uniform layer thickness distribution on the plank.

According to a third variant of the piston is introduced horizontally into the chromium electrolyte, that is, the annular grooves are perpendicular to the electrolyte surface _β The annularly arranged, projecting into the hats anodes are guided and held by Abstandslaisten.

The power supply rail on which the individual anode elements begin and also end, lies above the electrolyte surface.

In this anode arrangement, the voltage drop from the central power supply rail to the lowermost anode region of Hackt is rapid. As a result, a uniform Schichtdikkenverteilung is achieved, and the Verehromungszeit must be determined empirically to ensure a minimum layer thickness at all .Punkte the Ringnutflanken. By rotating the brine in the anode device, the said stream part can be reduced, but the mass of the brine and the required running accuracy of this variant set limits.

Object of the invention

The aim of the invention is to chrome both planks of an annular groove or a plurality of annular grooves of soles simultaneously and with the same layer thickness distribution.

The Verchroniung should be carried out with insoluble anodes with a long service life. The effluent from the anodes stream should be the same at all points. All joints should ensure a good electrical connection.

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Explanation of the essence of the invention

Bs it was found that this technical task is economically solvable in one step. The, piston is thereby introduced horizontally into the electrolyte, so that the Eingnutflanken run perpendicular to the electrolyte surface. In this case, both annular groove flanks are chrome-plated at the same time. According to the invention, an anode made of insoluble material is inserted centrally into the hat, with the anode material outside the membrane. Hat is clamped on both sides of bent electrically conductive plaque material for power supply and for stiffening and soft soldered on the back and so forms an anode hair ring.

The soldering serves for good electrical and mechanical connection of the anode with the plank material as well as the power supply, the. is attached to the circumference in the geometric center of the anode half-ring.

According to the number of annular grooves, a plurality of anode half rings can be connected by means of spacers, spacers and bolts to form an anode half shell.

The spacers hold the anode halo rings according to the. intervals to the required distance. The required distance, the erfindungsgamäßen device for the piston is achieved by spacers, which simultaneously take over the puncture of spacers between the Anodenhalbringen.

The two anode half shells are placed around the piston and tensioned by means of a device. The prestressed anode shells are electrically and mechanically on dam piston at their joints by means of clamping plates aelbsthaltend. connected. ... '·'

The two StoSstellen the anode shells are rotated relative to the vertical by 10 ° to 30 ° around the piston axis.

The ascending hydrogen can freely escape, as a result of the chrome plating, due to the anode arrangement, the position of the annular grooves and the position of the clamping plates.

The essential features of the device according to the invention are the divided anode ring with anode of insoluble material that protrudes into the hat and outside of the hat is clamped on both sides of bent electrically conductive sheet material for power supply and stiffening and soft soldered on the back, forming an anode half ring.

Another feature is the ability to connect the Anodenhalbringe means of spacers and bolts to anode shells and the distance keeping the Anodenhaibringe to the piston by means of spacers, which simultaneously take over the puncture of spacers.

A third feature is the electrical and mechanical connection of two anode shells by means of clamping plates which simultaneously hold the prestressed anode shells on the piston.

embodiment

The invention will be explained in more detail with reference to drawings.

Pig. Figure 1 shows the anode device in side view without pistons

Pig. Figure 2 shows a cross section through the anode device with a piston cutout

From Pig. 1 is the basic arrangement of the two Anodenhalbringa to recognize the individual Stromeinspeisungen ,, the rotation of the two joints with respect to the vertical about the piston axis, the position of the bolt 4 for connecting the Anodenhalbringe and the position of the clamping plate 3.

2 shows the cross-section through the anode device in FIG. 2. The structure of an anode half-ring with insoluble anode 1, which is clamped on both sides by bent electrically conductive flat material 2 and connected by soldering 7, can be seen. The 3olzen 4, spacers 5 and spacers 6 are mutually apparent in their arrangement.

Claims (7)

Srfindung3ansprüche 1. Device for the simultaneous chrome plating of both planks of piston ring grooves, in particular for pistons of force
and larger diameter machines with horizontal introduction of the piston into the chromium electrolyte
characterized in that an anode of insoluble
Material protrudes in the middle of the hat and outside of the
Hat clamped on both sides of bent electrically conductive flat material for power supply and stiffening and both soft soldered on the back is and
30 forms an anode hair ring. 2. Device according to item 1, characterized in that a plurality of anode heat rings by means of bolts to anode half-shells
get connected. 3. Device according to item 1 and 2, characterized in that the anode heat rings of an anode half shell with each other
By means of spacers are kept at the required distance. 4. The device according to item 1 to 3, characterized in that the anode half shells are held by means of spacers at a distance from the piston. 5. Device according to item 1 to 4, characterized in that the spacers simultaneously take over the puncture of spacers. 6. Device according to item 1 to 5, characterized in that both anode half-shells by means of clamping plate electrically and. mechanically, on the piston latching, be connected. 7. Device according to item 1 to 6, characterized in that the two joints of the anode half-shells with respect to the vertical by 10 ° to 30 ° are rotated about the piston axis. U '.