Home > Exhibition > Content
Repair process and polishing method of hydraulic cylinder piston rod
Mar 06, 2019

The hydraulic cylinder piston rod needs to be processed in time when it is used, otherwise it will affect the normal use. Our main repair method is to repair the lighter stretch marks by partial grinding and polishing; for heavy pull marks, take Repair of welding and manual grinding.

The filler and base metal of the piston rod of the hydraulic cylinder must be combined firmly and smoothly; the seasoning must be durable and easy to be processed by hand; the manual machining must ensure that the diameter error of the piston rod is less than 0.06mm. After analysis, it was decided that the filler used was J422 electrode. Because the acid electrode is not sensitive to rust, oil and moisture, it is not easy to produce hydrogenation holes; it has good processability and easy operation; the weld is beautifully formed; the material hardness is moderate, it is easy to be processed by hand, the arc is stable, the penetration depth is large, and the base metal The combination is firm.

Repair process of hydraulic cylinder piston rod

1. Clean the parts to be welded first, then use the wet mud to keep the traces around.

2. Use a welding rod with a diameter of 2.5mm to adjust the current of the welding machine to 120A, and use the straight line method to smoothly apply welding.

3. After all the welding is completed, the mud and slag are removed, and the rough boring is carried out along the circumference of the piston rod to maintain a machining allowance of 0.1-0.2 mm.

4. A cylinder with an outer diameter of 185mm, an inner diameter of 125mm and a length of 150mm is sawed along the axis (the outer diameter of the piston rod is 125mm), and is sawed along the axis, one for the rough mold and the other for the fine mold.

5. Apply a thin layer of red ink on the inner wall of the rough mold, then press the rough mold against the part to be repaired of the piston rod to reciprocate several times along the axis, and then use the fine boring to smash the red mark on the piston rod. Drop it. This is repeated repairs, leaving a machining allowance of 0.04-0.07mm.

6. The piston rod is then ground to the specified size with a 320-mesh sand slag kerosene and a precision mold.

7. Finally, hand-polished with kerosene on the back of the cloth. After measurement, the maximum error is only 0.03mm.

After the crane was repaired, after a year and a half of use, the variable-width hydraulic cylinder never showed any leakage, and the piston rod was smooth and rust-free.www.xhychromerod.com