The concept of exterior surface roughness reachs computational method

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Does exterior surface roughness tag a method give typical examples? ? Exterior surface roughness is acting (accord with) date should note the extension line in borderline of line of visible contour line, dimension, dimension or them to go up. Of the symbol most advanced must from the surface is pointed to outside material. ? ? The working face of surface of central aperture job, keyway, face that pours horn, round wine cup, can simplify tag. ? ? The working surface such as spline of gear, involute, whorl gives a tooth-like part of anything without the picture (tooth) when form tag a method. ? ? When same appearance has different exterior surface roughness to ask, must give its boundary with picture of fine solid line, and the symbol of the exterior surface roughness with corresponding outpour and dimension. ? ? When need represents local heat treatment or local plating besmears, apply rough spot to underline a picture to give its limits to tag relevant measure, also can ask its to note write inside symbol of exterior surface roughness. ? ? Successive surface reachs the part repeat element (…… of aperture, chamfer, tine) the surface and with connection of fine solid line discontinuous one surface, its are acting (accord with) date is tagged only. ? ? The part is major when exterior requirement is identical, unite in top right corner tag, add note ” of “ the others 2 words. Tag to simplify, or when the position is restricted, can tag simplify code name, also can use note a way elliptically, but these simplifying must explain to take the place of around caption column (accord with) the meaning of date. Use unified tag and simplify when tagging, its code name and literal specification all should be place of surface of the other on the graph 1 what note code name and character.

4 times. Does code name of exterior surface roughness reach his to note a way 1, symbol of exterior surface roughness and meaning accord with? Date meaning? Justice does parameter of exterior surface roughness note written position with each regulation? Basic symbol, use this symbol is no point alone. ? A1, A2- - surface roughness high parameter? ? ? ? ? allow a value (μm) ; ? B? Besmear of treatment method, plating or its? ? His finishing; ? C? Sampling length (Mm) ; ? D? Machine grain direction symbol; ? E? Mental allowance (Mm) ; ? F? Parameter of surface roughness span is worth (Mm) ? ? Or annulus rate of corridor bearing length. ? ? ? Add on basic symbol one short delimit, is expressing exterior surface roughness use? Obtain except material method. For example: Car, mill, auger, grind, cut, ? Polishing, corrode, electric spark treatment. ? ? ? Basic symbol adds one roundlet, express exterior surface roughness to use not purify? The method of material is obtained. For example casting, forge, is punch out of shape, hot-rolling, ? Cold rolling, pulverous metallurgy, be perhaps used at maintaining to supply a state formerly? The surface (include to maintain on the state of line working procedure) . ? ? ? Above can add one horizontal line by the side of the length of 3 symbols, with join at tagging? Several; In long side and horizontal stroke space can add one roundlet, show all face? Have demand of identical exterior surface roughness. 2, the tagging of parameter of height of exterior surface roughness is Ra value Rz, Ry worth code name meaning? Justice code name meaning? Justice? ? With the face that any methods gain, the * of Ra allows a value for 3.

2μm. ? ? With the face that any methods gain, the * of Ry allows a value for 3.

2μm. ? ? With the face that purify material gains, the * of Ra allows a value for 3.

2μm. ? ? With not the face that purify material method gains, the * of Rz allows a value to be 200μm. ? ? With not the face that purify material gains, the * of Ra allows a value for 3.

2μm. ? ? With the face that purify material method gains, the * of Rz allows a value for 3.

2uμm, the least value is 1.

6μm. ? ? With the face that purify material method gains, the * of Ra allows a value for 3.

2μm, the smallest permission is worth for 1.

6μm. ? ? With the face that purify material method gains, the * of Ry allows a value for 3.

2μm, the * of Ry allows a value for 12.

5μm. 3, symbol of exterior surface roughness brushwork? D' =h/10; H=1.

4h; H is font height. The surface roughness arenaceous standard that different treatment method may achieve, model housing casts ——————————Metal pattern casts ————————————Nicety casts ——————————Die-casting —————————Hot-rolling ——————————Die forging ——————————————Cold rolling ——————————————Extruding ————————————Scrape ————————————Dig is cut (half essence) —————Insert cut ——————————Bore ————————————Reaming thick ————————— of essence of life—Bore hole thick ———————————— of essence of life—Aperture of bore with a reamer (essence of life) ——————————Broaching half essence ———————————— of essence of life—Roll mill thick ———————————— of essence of life—Thick ————— of end panel mill——————— of essence of life—Thick ————— of the circle outside the car——————— of essence of life—The car carries thick —————————— of essence of life—Thick —————— of the circle outside grinding———————————— of essence of life—Grind outside thick —————————————— of essence of life———————————————— of top gem surface grinding—Columnar ———————————————Abrade thick ————————————————— of essence of life—Polishing is general ——————————————————— of essence of life—Superfinishing ———————————————The parameter of assess surface surface roughness and its numerical value (is arithmetic of GB1031-83) μm outline average deviation Ra? ? * series series of * of the 2nd series series of * of the 2nd series series of * of the 2nd series the 2nd series 0.

008 0.

010(14) 0.

012 0.

125 1.

25(7) 12.

5 0.

016 0.

160(10) 1.

60 16.

0 0.

020(13) 0.

20 2.

0 20(3) 0.

025 0.

25 2.

5(6) 25 0.

032 0.

32(9) 3.

2 32 0.

040(12) 0.

40 4.

0 40(2) 0.

050 0.

50 5.

0(5) 50 0.

063 0.

63(8) 6.

3 63 0.

080(11) 0.

80 8.

0 80(1) 0.

100 1.

00 10.

0(4) 100? Note: 1, recommend preferential choose Ra parameter (in Ra=0.

025 ～ 6.

The) inside limits of 3μm commonly used parameter. ? ? ? 2, preferential choose * series numerical value. ? ? ? 3, old GB surface is in bracket bright and clean spend grade, old GB changeover is new standard, it is to Ra with 5 changeover exemple, recommend press undermentioned 3 kinds? The order of means has transition: ① takes cost of series of * of the archives below closest, namely Ra is 6.

3μm. Below the situation that does not affect exterior function, ? Be helpful for machining craft sex; ② takes cost of series of * of the archives on closest, namely Ra is 3.

2μm. Apparent, raised the finished cost of former surface; ? ③ still takes the corresponding cost in the watch, this is to cannot press before two kinds of methods to undertake from time to time takes kind changing, when having special requirement, should not be commonly use. Microcosmic and rough degree at 10 o'clock series of Ry * of height of * of high Rz, outline series of * of the 2nd series series of * of the 2nd series the 2nd series 0.

025 1.

25 63 0.

032 1.

60(9) 80(3) 0.

040 2.

0 100 0.

050(14) 2.

5 125 0.

063 3.

2(8) 160(2) 0.

080 4.

0 200 0.

100(13) 5.

0 250 0.

125 6.

3(7) 320(1) 0.

160 8.

0 400 0.

20(12) 10.

0(6) 500 0.

25 12.

5 630 0.

32 16.

0 800 0.

40(11) 20(5) 1000 0.

50 25 1250 0.

63 32 1600 0.

80(10) 40(4) 1.

Of L of length of 00 50 sampling and evaluation length Ln choose (referenced) Ra (μm) Rz, Ry (μm) L (μm) Ln (μm) ≥0.

008 ～ 0.

02 ≥0.

025 ～ 0.

10 0.

08 0.

4 ＞ 0.

02 ～ 0.

10 ＞ 0.

10 ～ 0.

50 0.

25 1.

25 ＞ 0.

10 ～ 2.

0 ＞ 0.

50 ～ 10.

0 0.

8 4.

0 ＞ 2.

0 ～ 10.

0 ＞ 10.

0 ～ 50.

0 2.

5 12.

5 ＞ 10.

＞ of 0 ～ 80 50.

0 ～ 32.

0 8.

0 40.

0 note: When giving sampling length by this watch, can omit on the design not mark. CNC Milling