Working procedure dimension and public errand are decided really (3)

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3. From what still must continue to machine apparently the diagram that 3-8 of tagging exemple of 　 of working procedure dimension is the aperture inside one gear like graph 3 -86a. Inside hole size for, the depth size of keyway for, aperture reachs the treatment of keyway to be as follows orderly inside: (1) essence of life bores hole extremely; (2) insert keyway to come greatly dimension A 3 (get through dimension conversion) ; (3) heat treatment; (4) grind inside Kong Zhi dimension, assure keyway depth size at the same time. Solution: Process order according to above, can see after grinding aperture, must assure inside the dimension of aperture, return the deepness that must assure keyway at the same time. It is the A3 of working procedure dimension of the keyway deepness that after computation bores hole, this must machine. Graph 3-86b picture gave dimension catenary picture, after its fine vehicle radius, grind the radius Mm after aperture, and keyway deepness A 3 assures directly, to form link. The A 0= of keyway depth size of the earning after grinding aperture gets secondhand, it is a closed circuit. By type (3-21) 　 　 　 by type (3-22) 　 　 by type (3-24) 　 　 by type (3-30) with type (3-31) 4 of 　 of 　 　 　 . The 　 of computation of working procedure dimension that assures ply of cementite layer, nitriding layer has the surface of some of spare parts to need to undertake cementite, nitriding is handled, and the ooze layer deepness that assures a regulation even after finish machining. Must determine the size of ooze layer depth before finish machining correctly for this. Place of 3-87 of exemple 3-9 graph is shown for one sleeve kind spare parts, the exterior requirement nitriding that bore diameter is, deepness of layer of nitriding of the requirement after finish machining is 0.

3~ 0.

5mm, namely unilateral deepness is, bilateral deepness begs the deepness T 1 of layer of the nitriding before essence of life is ground to try. The treatment of this surface is orderly: Grind inside aperture comes dimension; Nitriding processing; Essence of life grinds Kong Zhi, make sure ooze layer deepness is T 0. Solution: Show by graph 3-87d place, knowable dimension A 1, A 2, T 1, T 0 formed chain of one technology measure. Apparent T 0 is a closed circuit, a 1, T 1 is add annulus, a 2 is decrease annulus. T 1 begs solution to be as follows: By type (3-21) 　 　 by type (3-22) 　 by type (3-24) 　 　 by type (3-30) with type (3-31) 　 　 reached so nitriding layer deepness should be 　 　 　 finally. 5. The computational 　 of dimension of the working procedure when the spare parts eletroplates has the surface of some of spare parts to need to eletroplate, there are two kinds of cases after eletroplating: It is for beautiful and antirust, to eletroplating the surface does not have precision requirement; To eletroplating the surface has precision demand another kind, want to make sure graph paper devises measure already, want to assure certain film ply again. Assure to eletroplate the method of exterior precision has two kinds: One kind is machine dimension to the appearance is being controlled before plating and control film ply; Another kind is plating treatment of junior travel grinding will assure dimension precision. When these two kinds of methods are undertaking dimension catenary is calculated, it is different that its seal closed circuit. Exemple 3-10 is shown like graph 3 -88a for cirque body, the diameter after chromium of its surface plating is, film ply (bilateral ply) for 0.

05~ 0.

08mm.

, craft of round face treatment is outside: Car, grind, plating is chromic. Try the A 2 of working procedure dimension before computational grinding. Solution: The design dimension of cirque is assured secondhand by the dimension before controlling plating chromium and film ply, sealing closed circuit should be design dimension. If graph 3-88b place shows 　 ,the picture gives dimension catenary picture by type (3-21) 　 　 　 by type (3-22) 　 　 　 by type (3-24) 　 　 　 by type (3-30) with type (3-31) 　 exemple 3-11 still workpiece of cirque of 3 -88a of to in an attempt to. Instead of diameter of the circle outside its, and treatment craft introduces a car, kibble, plating is chromic, essence of life is ground. Ply of the film after essence of life is ground is on the diameter 0.

05~ 0.

08mm. Beg the A 2 of working procedure dimension when the kibble before plating. Solution: Because after essence of life is ground, the film ply of place requirement gets secondhand, reason is a closed circuit. The picture gives dimension catenary graph to be like graph 3 -88c. CNC Milling CNC Machining