The accurate and abrade polish with small annular and chip area

Summary: Analysed the structural characteristic with small annular and chip area, according to exterior surface roughness and the requirement that machine pink to spend, determined the treatment method that uses accurate and abrade polish, designed workpiece clamping apparatus and treatment tool, decided treatment craft parameter. After workpiece nicety is machined, course check clear, assemble and check. Achieved design requirement completely. Crux word: Clamping apparatus of annular and chip abrade workpiece is annular and chip the crucial part that is bearing of straight raceway delicacy. Acute bearing is in the domain of war industry national defence such as nautical, aviation, spaceflight is having wide application. The crucial technology index of acute bearing is moment of force of the attrition that start, the crucial factor that decides size of moment of force of the attrition that start is the exterior surface roughness of workpiece and geometrical precision. Annular chip serves as the crucial part that forms acute bearing raceway groove, its surface quality and treatment precision decided bearing is developed whether successful. Accurate and abrade polish is chip of small area high accuracy achieves extremely low appearance surface roughness is worth and the very effective finishing of tall geometry precision machines a method. The accurate and abrade polish with small area annular and chip high accuracy is discussed in detail below this one crucial technology. If the graph is shown 1 times,1 work structure analyses workpiece. This workpiece has the following characteristic: ① work is poor, over all dimension is small, appearance is simple. Height is only 0.

26mm, external diameter 3.

7mm, internal diameter 1.

4 Mm; Appearance is unusually simple, it is annular chip; ② surface surface roughness is worth extremely low, geometrical precision is tall. The surface roughness value of two plane is Ra0.

025 μ M; The parallelism of two plane 0.

001mm, flatness 0.

00lmm, high dimension public errand 0.

01mm. Plant to this thin circlet body work, the requirement has extremely tall flatness, parallelism and surface roughness of extremely low surface to be worth, at the same time requirement surface does not have cut, degenerative layer small. The nicety of 2 workpiece is abrade (the clip of outfit of accurate, fast, reliable fixed position of workpiece of clamping apparatus of workpiece of 1) sharpener ① is accurate and abrade the key that has effectively. According to work measure, if the graph is shown 2 times,design fixture. Clamping apparatus dish external diameter 80mm, high 20mm, end panel surface roughness is worth Ra0.

4 μ M, face of one aspect of the matter is in what be a diameter with φ 76mm is circumferential go up to distributing equably 16 φ 1.

The alveolus of 4mm, hole depth 1.

7mm. 16 cylinder is sold (φ L.

2mm of 4mm × ) with 0.

The interference of 0lmm is enchased in clamping apparatus dish in alveolus, next cylinder sells end panel to be repaired consistently grind to face of Pan Duan of distance clamping apparatus 0.

2mm. When the job, clean its clean, in embed oil of turbine of a few of the besmear on the end panel that cylinder is sold, sell work fixed position with cylinder next, stick in clamping apparatus dish on. Wait for abrade hind, get off workpiece carefully with forceps, clean workpiece and clamping apparatus dish, search workpiece the area, abrade and additional at the same time. ② abrade flat is abrade make precision answer mirrors the plane geometry appearance of flat to go up to workpiece. High accuracy of abrade small area is used when planar workpiece grind provided technical requirement provides flexibility to be out of shape to grind small, tigidity is good, in order to assure abrade the correct figure when; Material is qualitative close together, hardness is even, have good wear-resisting performance and geometrical precision to maintain a gender; Material hardness is lower, have retain the ability that wears bead. According to technical condition, choose low alloy tall phosphor cast-iron and abrade flat, have good precision to maintain gender, wearability, embed arenaceous sex and taller abrade efficiency. Abrade flat is shown 3 times like the graph. Dimension of quadrate and accurate abrade flat is 300mm of 300 Mm × , do not open groove, surface roughness value is Ra0.

1 μ M, flatness 0.

003mm. Abrasive of ① of Nextpage (2) abrade craft uses diamond abrade cream, granuality W3.

5. Type of sinusoid of contrail of ② abrade motion is abrade athletic contrail, motion is smoother, orbit repeats not easily, stripe forms regulation, the stiff density of reticulation lets time increase become close, be helpful for reducing exterior surface roughness to be worth. Abrade craft parameter includes parameter of ③ abrade craft abrade speed, abrade pressure and abrade time. Test result is like subordinate list: Temperature of set of room temperature of environment of ④ abrade work 20 ± 1 ℃ ; Use clean room and exceed clean workbench. (Nicety of quality of 3) abrade treatment is abrade after treatment, the technical target that via detecting workpiece reachs: Parallelism 0.

0008mm, flatness 0.

0005mm, size consistency 0.

003mm; With the standard appearance piece is compared, surface roughness is worth Ra0.

032mm, below 40 times microscope backlighting looks, reticulation is compact, but extremely individual work has cut. The accurate polish of 3 workpiece is after nicety is abrade, grind the treatment trace such as dot of grain, cut, hemp, burr for purify, raise the surface to machine quality, obtain lower exterior surface roughness to be worth, need undertakes accurate polish to workpiece. (1) workpiece clamping apparatus is hurt to be not touched or cut workpiece. Had maintained already polishing face, designed workpiece clamping apparatus and disassemble tool, if pursue,4 are shown. The step aperture φ that will wait for polishing workpiece to put system of park clamping apparatus 3.

In 7mm, with rag wheel its polish, use next disassemble lever provides body φ from clip 2.

work the top gives at the back of the aperture of 4mm, clean workpiece and clamping apparatus, another face of the methodological polish work with similar reoccupy achieves craft requirement. (Means of polish of craft of 2) accurate polish: If the graph is shown 5 times,half solid knot grinds a polish. Granuality is W0.

The diamond of 5 is abrade cream Tu Fu is on rag wheel, rag wheel by medical and high-minded vortical shape circles degree of pledget roll into on arbor to form, arbor gets main shaft drive by the handgun. This kind of rag wheel is flexible good, have the good sex that contain dip to polishing agent. Polishing agent: Granuality is W0.

The diamond of 5 is abrade cream. Polishing moves: Rag wheel makes high speed rotate, press to workpiece surface with lesser pressure, at the same time workpiece makes feed motion. Polishing time: 5~20s/ second. Polishing work environment: Room temperature set 1 ℃ of 20 ± ; Use clean room and exceed clean workbench, prevent to machine interfuse of the dust in the environment, eyewinker, produce mechanical effect to polishing surface, cause polishing defect. (Classics of quality of 3) accurate polish detects exterior surface roughness is worth Ra0.

012 μ M, observation falls in 40 times microscope, without cut, grind the blemish such as dot of grain, hemp, burr; Machine degenerative layer minimum; Did not reduce quite before geometrical precision and polish, achieve craft requirement. 4 conclusion study through the experiment and machine test and verify, according to afore-mentioned nicety abrade with rule of accurate polish craft, high accuracy of treatment small area is annular and chip, the exterior quality of treatment and treatment precision achieve design requirement. Via detecting: Chip surface surface roughness is worth for Ra0.

012 μ M, without cut, grind the abrade polish blemish such as dot of grain, hemp, burr; Parallelism 0.

0008mm, flatness 0.

0005mm, size consistency 0.

003mm. After this kind of good with finish machining annular and chip part assembles acute bearing, classics test, moment of force of the attrition that start achieves a design to ask. The nicety with small area annular and chip high accuracy grinds cast a success, the development that is acute bearing laid solid foundation. In the meantime, also be other the accurate treatment of annular and chip spare parts provided reference. CNC Milling