How to quickly repair gear pump hydraulic system failure (2)

The main principle of choosing the spraying process parameters is to increase the bonding strength between the coating and the substrate. Spray gun and the workpiece during the relative movement speed is greater than the flame moving speed, the speed of the size of the coating thickness, spray wire feeding speed, arc power and other parameters determined jointly. Spray gun and the surface of the workpiece is generally about 150mm. Other specifications for arc spraying are determined by the characteristics of the coating equipment and the coating material. ⑷ spraying working layer should be first wire brush to remove the adhesion of the bottom surface of the sediment, and then immediately spray coating. Materials for the carbon steel and low alloy wire, the coating has a higher wear resistance, and lower prices. Spray coating thickness should be based on the amount of wear and tear of the workpiece, machining allowance and other relevant factors (diameter shrinkage, clamping deviation, spray coating diameter uneven amount, etc.) to determine. ⑸ cooling spray temperature after the workpiece is not high, the general can be directly air-cooled. ⑹ spray coating processing machinery processing to the required size of the drawings and the provisions of the surface roughness. Gear pump sticky surface repair technology 1, surface sticky coating principle and characteristics In recent years, surface sticky coating technology in China's equipment maintenance has been widely used for a variety of materials, parts and equipment repair. Its working principle is to add molybdenum disulfide, metal powder, ceramic powder and fiber and other special filler adhesive, directly applied to the surface of materials or parts, so that it has a wear-resistant, corrosion and other functions, mainly for surface strengthening and repair . Its process is simple, convenient and flexible, safe and reliable, does not require specialized equipment, just a good glue coated on the surface of the cleaned parts to be cured after curing can often operate at room temperature, will not make the parts Produce thermal equivalent effect and deformation. 2, sticky coating coating process Cylindrical sleeve, sleeve end face fit, gear end face or pump housing bore small area uniformity of wear between 0.15-0.50mm, scratch depth of 0.2mm or more When, should use sticky coating repair process. Adhesion coating coating process: initial cleaning → pre-processing → final cleaning and activation → preparation of repair agent → coating → curing → finishing, cleaning or post-processing. Although the sticky coating process is relatively simple, but the actual construction requirements are quite strict, just choose a good adhesive, not necessarily able to obtain high viscosity strength. It is necessary to select the right adhesive, but also strictly in accordance with the correct process of adhesive coating the right adhesive, but also strictly in accordance with the correct process method line viscosity coating in order to obtain a satisfactory coating effect. ⑴ early cleaning parts surface must not have grease, water, rust, dust and so on. Wash with gasoline, diesel or kerosene first, then acetone. ⑵ pre-processing fine sandpaper into a certain trench mesh, exposing the base color. ⑶ final cleaning and activation treatment with acetone or special cleaning agent. Then sandblasting, flame or chemical treatment to improve the surface activity. ⑷ preparation repair agent repair agent in use should be strictly in accordance with the provisions of the ratio of the agent (A) and curing agent (B) fully mixed to the same color as well, and within the prescribed time, run with the use. ⑸ coated with the first repair agent in the repair surface coating a thin layer, repeated scratching and parts fully infiltrated, and then evenly coated to the specified size, leaving a finishing allowance. As much as possible in the coating to move in one direction, the reciprocating coating will wrap the air in the gel to form bubbles or pores. ⑹ curing coated with a release agent in the steel pressure in the work, the general room temperature curing takes 24 hours, heating curing (about 80 ℃) required 2-3 hours. ⑺ finishing, cleaning or post-processing fine boring or with a file, fine sandpaper, whetstone will be finishing surface finishing to the required size.