Chromed cylinder. Drawing, description

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Chromed cylinder. Tips for a modeler

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To perform work with the cylinder liner, a mandrel is made. Its device is clear from the above figure, we will dwell only on individual details.

Anode - steel pin; from one end of it, lead with antimony (50-60%) is welded over a length of 7-8 mm. Lead is machined along the outer diameter up to 6 mm (for sleeves with a working Ø 15 mm). On the other side of the stud, a thread is cut to fix the wire.

Cylinder chrome plating
Mandrel for chrome plating of the cylinder liner: 1 - cover (vinyl plastic), 2 - upper part of the mandrel (fluorine plastic), 3 - lower part of the mandrel (fluorine plastic), 4 - anode (steel), 5 - cathode, 6 - through window for electrolyte passage, 7 - coated sleeve, 8 - nozzle-insulator

The cathode is a ring with an inner diameter 0,5 mm larger than the inner size of the sleeve. A piece of insulated wire is minted into it. It is better not to use copper and brass conductors - the electrolyte dissolves them, and the contact may be broken. Before mounting the mandrel in the bath, it is useful to check the reliability of the contacts with a tester.

Cylinder chrome plating
Mandrel for chrome plating of the shaft and piston pin: 1 - anode, 2 - cathode, 3 - crankshaft, 4 - conical mandrel, 5 - piston pin

Chrome plating of steel parts (crankshaft, crank pin, piston pin, bearing races)

Chrome plating of steel parts is carried out according to the following technology:

removing grease stains with gasoline;
washing in hot water with soap;
processing the part with reverse current for 2-3 minutes;
switching to the chrome plating mode with a current 2-2,5 times greater than the calculated one, and a gradual decrease in current for 10-15 minutes.

The rated current is determined by multiplying the area of the chrome plated surface by the process current. For steel, the last value is 50 A/dm2. When chrome plating, for example, a seat under the main bearing on the crankshaft of the KMD-2,5 engine, the calculated current will be 0,03 dm2X50 A / dm2 = 1,5 A.

You will need a new mandrel to chrome the crank pin. As with crankshaft processing, all open areas of the surface are covered with AGO glue. The anode is machined from steel, followed by pouring lead and boring a hole for the finger. The use of a steel part is explained by the need to ensure reliable contact - in lead, threaded connections are unreliable. Current calculations are similar. Work is carried out in the mandrel of the shaft using a special nozzle.

The chrome plating of the bearings is practically the same. The only thing is that to protect the inside of the part, it is filled with grease or other grease, which, after coating, is washed out with gasoline.

Cylinder chrome plating
Mandrel for chrome plating of the outer race of the ball bearing: 1 - bearing mandrel housing, 2 - ball bearing, 3 - curly nut, 4 - anode (lead), 5 - central part of the mandrel for chrome plating, 6 - cathode (steel), 7 - cover, 8 - through window for passage of electrolyte

Cylinder chrome plating
Mandrel for chrome plating of the crank pin: 1 - crankshaft (aka cathode), 2 - through window for electrolyte passage, 3 - anode, 4 - cover fastening screw, 5 - mandrel parts (fluoroplastic)

The concentration of chromic anhydride in the electrolyte is controlled using a hydrometer. The concentration of sulfuric acid can be determined only, unfortunately, indirectly, by the quality of the coating.

During chromium plating, the electrolyte evaporates. In these cases, add water to the desired level. This is done without installing parts - it is possible to change the temperature of the electrolyte.

After chromium plating, all products are subjected to heat treatment for 2-3 hours to remove hydrogen, at a temperature of 150-170°. All work is carried out under a fume hood, wearing rubber gloves and goggles.

Author: A. Mussalitin

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