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A) plating skills: the plunger outer layer of hard chrome plating; (b) electrical brush skills: the plunger outer brush wear data; (c) thermal spraying or electric arc spraying or spray: Spray-carbon Horse s body wear data; (d) laser cladding: the plunger outer cladding alloy powder by high hardness.
(4) cylinder bore no copper cylinder data sets are mostly ductile iron, prepared amorphous thin film or coating on the cylinder wall. Since the cylinder bore wall with this particular substance, so talent composition hard - hard matching friction deputy. If you blindly grinding cylinder bore, the cylinder bore wall of this layer look out research data, more friction constructor function has changed. Deputy friction coating is removed, if the use of force, it will dramatically increase the friction surface temperature, the plunger rod and cylinder bore attack gluing.
Also look at the preparation of the plunger rod a common film with a coating rich in less wear + wearable + smooth function, this group is still a hard practice of friction deputy - soft pairing, once people change coating, also damaged Best paired friction deputy, repair these special piston pump, it is necessary to a professional repair plant.
3.2 shoe and the swash plate
Sliding friction shoe and the swash plate is a swash plate piston pump three pairs of friction pairs in the most complex pair.
Table 1 lists the plunger rod ball and slipper ball voids (see Figure 2), if the piston and slipper gap tolerance, high-pressure oil in the piston chamber will from the plunger ball and slipper gap the escape, the shoe and the swash plate film thinning will form hydrostatic bearing failure is grim, the shoe and the swash plate seizure metal touch friction shoe ablation fall, the plunger swash plate ball head scratching. When the plunger rod ball and slipper ball beyond Gongyi 1.5 times, it is necessary to replace the group.
The plunger rod and the plunger rod cylinder bore diameter φ16 φ20 φ25 φ30 φ35 φ40
Specifications gap 0.015 0.025 0.025 0.030 0.035 0.040
Limit 0.040 0.050 0.060 0.070 0.080 gap 0.090
The plunger rod ball
And slipper ball norms 0.010 0.010 0.015 0.015 0.020 gap 0.020
Limit gap 0.30 0.30 0.30 0.35 0.35 0.35
Swash plate effect after a period of time, the swash plate plane will show a concave appearance, in the selection of channels before polishing should first measure the initial hardness scale and plane. After grinding, and then measured the amount of polishing is the number, as in less than 0.18, not hinder the use of piston pump; if exceeded 0.2mm or more, should be used in a way to adhere to the original nitride nitride layer thickness.
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When the swash plate plane is scraped out of the groove ball plunger, the choice of laser cladding alloy powder approach to corrections. Laser cladding contact skills can guarantee the strength of materials, but also ensures that information fill melt hardness, hardness does not drop the whole periphery of arrangements.
Also along with the choice of chrome craft with welding rod welding, repair welding over the swash plate heat from the ground plane for an optimal selection of nitriding furnace heat treatment. Regardless of which approach to take corrective swash plate, it has the necessary rehabilitation of the existing scale precision, hardness and appearance roughness.
3.3 valve plate and the cylinder surface with a stream of correction
Valve plate has a plane equipped with a flow and spherical flow two ways.
Deputy spherical friction with the flow in the cylinder with a relatively shallow stream surface scratches, after grinding technique amended; cylinder with flow surface grooves when the deeper, you should choose "the appearance of engineering skills" approach filled trench, then grinding , not blindly grinding ,, to prevent copper layer thinning or spill out of the steel substrate.
