Diagram method of compendious working procedure dimension

The measure preparation work that 5m) 1 builds technology measure chain with diagram method of compendious working procedure dimension is freehand give spare parts sketch, measure is devised in line out of diagram upper part. (If graph 3) analyses a spare parts to machine a process, understand each surface to machine a frequency. In this exemple, the surface 1, 2, 3, 4 each treatment. In part drawing each treatment surface increases surplus, draft of semifinished product of part drawing translate into. Graph 3 graphic build an attention: A.

Every surface treatment should increase on a few surplus a few times: B.

To make graphic and clear, surplus should magnify appropriately. The hand bad draft after this part drawing is changed is shown 3 times like the graph. The solution that use a figure expresses to machine a process to be down the line that bring vertical stroke from each surface that will machine, machine the surface on behalf of semifinished product surface and each working procedure respectively. Strict according to treatment order, from the top down, with the regulation the symbol expresses to machine a process. If use,state fixed position is standard, with " · " state working procedure is standard, with express to machine the surface, with show working procedure measure, with express mental allowance to wait. Of this exemple graphic if the graph is shown 3 times,build. Notice: ? Be angry of び of commonplace of ⒓ of Yun of Ji of Hui of ば of ⒐ of flesh of  of Jie of ば of discharge of hut of look forward to health word of the tritium that be short of box guides only then the symbol that commonplace の extensive does not have phenolic χ of    to drive duck of Kuo of ば of buffalo gnat Bei to need this measure of? of Jin of け rice huller uses a provision will be whole treatment process, intuitionistic, clear the earth's surface is shown gave a spare parts to be in turn into by semifinished product in finished product process, each machine the immanent connection between the metabolic condition with exterior true measure and each dimension, fashioned process " dimension contacts a graph " . This is the crucial part that builds technology measure chain, take care without fail. By graphic build what dimension catenary decides a process of closed circuit machining is medium to seal closed circuit to have two kinds. The design measure that gets secondhand is a closed circuit. Mental allowance (rely on scintilla grinding except) to seal closed circuit. Because seal closed circuit sure form secondhand, reason but will seal closed circuit picture to be in whole and graphic most lower part, with express. In this exemple, design dimension 30-0.

3 get directly, be comprise annulus; and design dimension 8+0.

3 with 16-0.

3 get secondhand, it is a Z1 of surplus of closed circuit; , z2, Z3, z4 all is a closed circuit. By seal closed circuit to search compositive annulus by what afore-mentioned getting each seals closed circuit, ordinal search relevant compositive annulus, in order to form dimension chain. When searching compositive annulus, can undertake according to following a pithy formula: From seal closed circuit two end search up, encounter arrowhead bend to search, encounter " · " continue to search up. Until intersect. Explain: Encounter arrowhead to mean measure of this working procedure influential to sealing closed circuit, should in catenary of plan person dimension, reason should bend; is encountered " · " mean still be same and fiducial, reason should continue up, and cannot bend. One seals closed circuit to be able to build chain of a dimension only, and catenary of a dimension can seek solution only an unknown quantity, reason removes the working procedure measure that gets directly outside, have how many unknown quantity, should build chain of how many dimension. Will search the dimension chain that give to list alone, form dimension catenary plan. The concerns with working procedure dimension dimension catenary plan that forms in this exemple is like graph 4(a) , (B) , (C) place is shown. (A) (b) (c) pursues 4 dimension catenary pursues the size that the solution of catenary of 2 technology measure calculates the purpose that builds technology measure chain to depend on mental allowance of dimension of the working procedure that seek solution and its public errand, checking computations, use formula of dimension catenary computation to be able to seek solution. But need to note the following problems: When the catenary of processing computation dimension when comprising out of tolerance of annulus public errand, can appear sometimes the circumstance that comprises the sum of annulus public errand to be more than a closed circuit public errand, this is unallowed. Right now, should raise the treatment precision of corresponding working procedure, reduce the noncombatant duty that forms link. In this exemple, dimension H3=300.

3 it is the design measure that gets directly, as a result of its public errand oneself be equal to a closed circuit 8+0.

3 with 16-0.

The public errand of 3, reason should compress his. This exemple takes H3=30-0.

15, get H2=14+0.

15, h4=22-0.

15-0.

30. The handles communal composition annulus to should satisfy its to be in at the same time many dimension catenary of communal composition annulus asks to its public errand and deviation, answer to decide its public errand and deviation by fast to its precision requirement dimension chain. When the processing of harmonious annulus should have measure of many sealed working procedure in catenary of a dimension, need to choose annulus of a composition to serve as harmonious annulus, its extreme deviation cannot decide beforehand, and can be in only the case that extreme deviation already decided each annulus leaves other, through dimension catenary computation decides, in order to satisfy the requirement of a closed circuit extreme deviation. The forms link processing that with the design dimension has nothing to do and the measure that devise dimension to have nothing to do, its public errand can press the economical accuracy grade that machines working procedure originally to decide, deviation can use body principle to tag. In this exemple, dimension H1 and design dimension do not have immediate impact, its are basic dimension H1=H3+Z3=31.

5mm, take economical accuracy grade to be IT12, tolerancepublic errand T=0.

25mm, deviation is tagged by the principle that enter system, criterion H1=31.

5-0.

25mm. 3 last words in this diagram method, the expression of working procedure dimension and surplus and effective treatment state agree completely, very intuitionistic, facilitating promotion. Build graphic, affirmatory a closed circuit, searching compositive annulus is the trilogy that builds dimension chain. Building graphic essence is to use " formulary symbol " the key that expresses to machine process; to seal closed circuit certainly is to find out " obtain secondhand " design dimension; and remember well in article " a pithy formula " , criterion but apace finds compositive link, then builds dimension chain. This diagram method applies to any complex technology measure catenary to build, efficiency is tall, the effect is good, have promotion and economic value extremely. CNC Milling CNC Machining