Of seal ring of narrow black lead abrade

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Summary: Introduced to be the abrade treatment of the seal ring of material with black lead M106H, the key introduced to grind, abrasive and technology measure. 1 overview has the seal ring that is material with black lead M106H in the fuel feed pump of a few kinds of aviation that my unit produces kind spare parts, its model spare parts is shown like plan institute. This spare parts is end panel sealed work way, b face is sealing surface, this precision demand is very high. When machining B face, accurate turning short of asks, and this black lead is brittleness material, still contain epoxy resin, cannot grinding, use abrade treatment via analysing a decision. Below the circumstance that draws lessons from without the data, we are right of spare parts of this kind of black lead abrade undertook craft experiments, reached finally better technique, achieved the requirement of the spare parts. 2 craft analyse sketch map of graph seal ring the craft course of the spare parts: Mill of thick car → face of abrade B of → of vehicle of fine of two chamfer → . From the craft course above knowable: Abrade B face should assure Ra0 of exterior surface roughness.

1µm, parallelism 0.

01mm, flatness 0.

0006mm. Use groovy dry abrade treatment first, exterior surface roughness and flatness this two element are completely unqualified, the 4 ～ that the actual measurement of flatness is worth contest to be as high as a requirement to be worth 7 times, namely 0.

0024 ～ 0.

0042mm. Begin to analyse from material character next, m106H is macerate black lead kind, shore hardness 60, compressive strength 117.

6MPa, bending strength 49MPa. Experiment through craft, used principle of small layer extruding. Specific means is: The small pink that will pass filter and kerosene are built-in and abrade after flat, reoccupy polish creams the small pink of flat surface thick bead is cast, make the small pink grain of outstanding flat surface casts smooth, height to agree. Next, put the part on such flat directly abrade, such, flat can undertake to B face even consistently cutting of type of small layer extruding. Part of 3 treatment move reachs the designated position to be machined for fine vehicle, sharp edge has local collapse edge, abrade technology move is as follows: 1) arranges treatment place, make an environment clean. Will abrade flat, spare parts is cleaned clean thoroughly, this one step is very important to assuring to machine a success. 2) is thick grind flat. Choose 300mm of 3 300mm × not to open cast-iron flat of groove, had better choose low alloy tall phosphor cast-iron flat. Because the metallographic organization of this flat is flake graphite and fritter shape pearlite, make more easily be ground win taller form precision and exterior surface roughness. With W20 oil of small pink coal is opposite grind flat. Narrate to facilitate, 3 flat number is 1, 2, 3, express to be opposite with the mark grind method, the element expresses flat, denominator expresses next flat, be opposite by the following order grind: 3/2 of → of 3/1 of → of 2/1 of → of 2/3 of → of 1/2 → 1/3, circulate by this order: 3) essence grinds flat. Still be opposite by afore-mentioned order with W7 small pink grind. After grinding, with 200mm one class blade makes the same score feet examination, should not pervious to light or impress is even; Optics of 80mm of usable also Φ makes the same score brilliant to check, should not tape of interference of a over light-wave, show divide evenly small protruding. Should notice: Be opposite via thick, essence after grinding, already had a large number of small white in built-in flat stoma, these small pink are enough already to cutting black lead, undertake controlling arenaceous process no longer. 4) polish flat. 4 silken cloth the shop is on the flat that already had ground together, with kerosene will silken cloth is irrigated fully, chromic polish of reoccupy W7 oxidation creams will additional 2 flat that had ground are in respectively silken cloth upcast is smooth. The action of polishing is the small pink thick bead that casts flat to go up, make embed the small pink of flat distributings to agree highly. In the meantime, raise the exterior surface roughness of flat, make its are less than Ra0.

1µm. This working procedure is the key of this technique. 5) drips on 2 flat of classics polish 1 ～ 3 kerosene and appearance oil, get on oil in flat with cotton daub is even, after crossing 3min, the oil reservoir rub-up of flat surface. Such, the mixture with the kerosene in infiltration flat stoma and small even pink, formed the fluid of small layer cutting that machines black lead. 6) puts the part on flat to undertake helix shape of the loop moves, two tactics agrees smoothly forcibly, pass cutting of type of small layer extruding, those who finish planar B is abrade. The attention brushs flat frequently, seasonable eliminate grinds bits and contamination. After 7) spare parts grinds, use silken cloth or pledget clean to obliterate gently abrade ort. Notice to cannot be cleaned with oily fluid, via experiment discovery, after oily fluid immerge, the exterior surface roughness of the spare parts becomes poor. After 4 technologies effect uses afore-mentioned craft to machine, the flatness that via detecting Q assured a spare parts 0.

0006mm, Ra0.

1µm and other ask. Till now, the black lead seal ring of these a few kinds of fuel feed pump undertook 20 much batch are machined in all, satisfied blueprint requirement completely, craft effect is stable. CNC Milling