The choice of exterior treatment method (go up)

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The craft course of spare parts machining is to show process of spare parts production is medium, the working procedure that passes to finished product place by semifinished product early or late ordinal. When protocol craft course, besides considering the option with standard fixed position above all, return the option that ought to consider each surface to machine a method, working procedure concentration and dispersive degree, machine level differentiate and working procedure early or late sequential the problem such as arrangement. Return method of general without and whole craft course protocol at present, sum up an a few omnibus principles only, be in specific when applying these principles, want a foundation specific requirement integration analysis. The basic course of protocol craft course sees graph 4-28 place is shown. The surface machines methodological choice, the face that has quality demand for on the spare parts each namely chooses a reasonable treatment method. When the choice, machine a method finally according to make choice of of exterior precision and surface roughness requirement first commonly, decide to the treatment method of working procedure prepares before finish machining again next, machine plan certainly namely. Because obtain the treatment method of same precision and surface roughness to often have a few kinds, besides the consideration when the choice productivity asks and outside economic benefits, still should consider following factor: (The property of 1) workpiece material for example, the finish machining of spare parts of hard steel of temper by dipping in water should use the method of grinding; The finish machining of nonferrous metal spare parts should use the treatment method such as careful car or careful boring, and should not use grinding. (The structure of 2) workpiece and dimension for example, the Kong Cai to IT7 class precision is cut with broaching, bore with a reamer, the treatment method such as boring and grinding but. But need not be pulled like the Kong Yi on casing or grind, and often use Kong He of bore with a reamer to bore hole, the aperture that the diameter is more than 60 ㎜ is unfavorable use auger, enlarge, bore with a reamer. The basic course of protocol of course of craft of 4-28 of graph of Normal Align=center>normal Align=center> (method of treatment of choice of 3) production type wants to suit with manufacturing type photograph. Large quantities of mass-produced should choose productivity Normal > is mixed high the treatment method with stable quality. For example, plane and Kong Cai use broaching to machine. Odd pre production uses dig to cut, milling plane and auger, aperture of enlarge, bore with a reamer. If be mixed to make sure quality is reliable,stabilize again, assure taller n, in large quantities of mass-produced in use honing and superfinishing craft to machine nicer spare parts. (Condition of 4) specific production should make full use of existing equipment and technology measure, introduce new technology ceaselessly, undertake technical reformation to old equipment, tapping the potentiality of enterprise, raise craft level. Normal > watch 4-1~4-4 parts the circle outside listing, inside aperture and planar treatment program and economical accuracy, machine the reference when the method for the choice. Outside expressing 4-1, round face machines plan Normal TEXT-INDENT of Center" Align=center> serial number: 57.

9pt"> machines plan Normal TEXT-INDENT of class of 65pt"> economical accuracy: 0cm; TEXT-ALIGN: Ra is worth surface roughness of Center" Align=center> surface / μ Mnormal TEXT-INDENT of 75pt"> suitable scope: 0cm; TEXT-ALIGN: Center" Align=center>1normal TEXT-INDENT of Left" Align=left> thick car: 8.

9pt">IT11 is the following 50 ~ 12.

5normal > applies to quench all sorts of metal Normal Align=center>2normal TEXT-INDENT of vehicle of fine of half of Left" Align=left> thick car: 8.

9pt">IT8 ~ 106.

3 ~ 3.

2normal Align=center>3normal Align=left> thick car Normal >IT7 ~ 81.

6 ~ 0.

8normal Align=center>4normal Align=left> thick car pressure (or polishing) Normal >IT7 ~ 80.

2 ~ 0.

025normal Align=center>5normal Align=left> thick car one grinding Normal >IT7 ~ 80.

8 ~ 0.

4normal > basically is used at quenching steel, also can use at quenching steel, but Normal Align=center>6normal Align=left> thick car one essence grinds one kibble Normal >IT6 ~ 70.

4 ~ 0.

1normal Align=center>7normal Align=left> thick car one essence grinds one kibble one superfinishing (or annulus type exceeds essence of life to grind) Normal >IT50.

1 ~ Rz0.

1normal Align=center>8normal Align=left> thick car one fine vehicle one diamond car Normal >IT6 ~ 70.

4 ~ 0.

025normal > basically uses at asking taller nonferrous metal machines Normal Align=center>9normal Align=left> thick car one essence grinds one kibble to exceed essence of life grinds or lens face grinds Normal >IT5 above 0.

025 ~ Rz0.

05normal > extremely of high accuracy outside round treatment Normal Align=center>10normal Align=left> thick car one essence grinds one kibble one abrade Normal >IT5 above 0.

1 ~ Rz0.

Aperture of 05 watches 4-2 machines plan Normal TEXT-INDENT of Center" Align=center> serial number: 50.

55pt"> machines plan Normal TEXT-INDENT of class of Center" Align=center> economical accuracy: 0cm; TEXT-ALIGN: Ra is worth surface roughness of Center" Align=center> surface / Normal Align=center>1normal Align=left> gets Normal >IT11 ~ 1212.

5normal Align=left> treatment did not quench steel reachs cast-iron sincere semifinished product, also can use at machining nonferrous metal (but exterior surface roughness is largish, bore diameter is less than 15 ~ 20 ㎜) Normal Align=center>2normal Align=left> gets, Normal >IT93.

2 ~ 1.

6normal Align=center>3normal Align=left> gets, bore with a reamer, Normal >IT7 ~ 81.

6 ~ 0.

8normal Align=center>4normal Align=left> gets, enlarge Normal >IT10 ~ 1112.

5 ~ 6.

3normal Align=left> is Alexandrine, but bore diameter is more than 15 ~ 20 ㎜ Normal Align=center>5normal Align=left> gets, enlarge, Normal >IT8 ~ 93.

2 ~ 1.

6normal Align=center>6normal Align=left> gets, enlarge, thick bore with a reamer, Normal >IT71.

6 ~ 0.

8normal Align=center>7normal Align=left> gets, enlarge, machine bore with a reamer, Normal >IT6 ~ 70.

4 ~ 0.

1normal Align=center>8normal Align=left> gets, enlarge, pull Normal >IT7 ~ 91.

6 ~ 0.

1normal Align=left> large quantities of mass-produced (precision decides by the precision of broach) Normal Align=center>9normal Align=left> thick boring (or reaming) Normal >IT11 ~ 1212.

5 ~ 6.

3normal > is divided quench all sorts of material outside steel, semifinished product has casting to give opening or forge gives aperture Normal Align=center>10normal Align=left> thick boring (wide spread) , half essence boring (enlarge of essence of life) Normal >IT8 ~ 93.

2 ~ 1.

6normal Align=center>11normal Align=left> thick boring (enlarge) , half essence boring (enlarge of essence of life) , boring of essence of life (bore with a reamer) Normal >IT7 ~ 81.

6 ~ 0.

8normal Align=center>12normal Align=left> thick boring (enlarge) , half essence boring (enlarge of essence of life) , boring of essence of life, Normal >IT6 ~ 70.

8 ~ 0.

4normal Align=center>13normal Align=left> thick boring (enlarge) , half essence boring, the Normal >IT7 ~ 80.

8 ~ 0.

2normal Align=left> basically is used at quenching steel also can be used at quenching steel, but unfavorable use at coloured Normal TEXT-INDENT of Left" Align=left> metal: 0cm; TEXT-ALIGN: Center" Align=center>14normal Align=left> thick boring (enlarge) , half essence boring, kibble, essence of life grinds Normal >IT6 ~ 70.

2 ~ 0.

1normal Align=center>15normal Align=left> thick boring, half essence boring, boring of essence of life, Normal >IT6 ~ 70.

4 ~ 0.

05normal Align=left> basically uses at precision to ask tall nonferrous metal machines Normal Align=center>16normal Align=left> is gotten, (enlarge) , thick bore with a reamer, bore with a reamer of essence of life, honing; Auger, (enlarge) , pull Normal Align=left> , honing; Thick boring, half essence boring, boring of essence of life, honing Normal >IT6 ~ 70.

2 ~ 0.

025normal TEXT-INDENT with very high demand of Left" Align=left> precision: 0cm; TEXT-ALIGN: Center" Align=center>17normal Align=left> with abrade the honing Normal >IT6 class above CNC Milling CNC Machining