In the mechanical design that be not mark, use many cutting to machine a spare parts via often seeing a few mechanical equipment are medium, little an a few place, many about a hundred (sample phase is highlighted particularly) . In such mechanical equipment, single spare parts cost reacted greatly the price of whole machine. Accordingly, when the engineer is designing component, should master skill of a few experience, will reduce spare parts cost with this. In the article, will share with everybody " milling is machined " in 6 commonly used design little skill. When milling spare parts is designed, the treatment of the spare parts is difficult easy degree, precision asks to wait, can bring about spare parts treatment produce tremendous change. So, the design knowledge that masters milling spare parts is very important, simple for, can from below 3 angle have a consideration. The spare parts machines involves cutting tool; The difficult easy degree that the spare parts machines; The treatment facilities that spare parts treatment involves (what show some or need) . Point of view of these 3 designs sees together below reflect design little skill namely. 1. In groove treatment, cutting tool (establish milling cutter) for cylindrical, machining extreme is the round horn of radius R. If plan institute is shown, if groove extreme is corner, finished cost can become tall.Following plan institute are shown, cutting tool (establish milling cutter) for columnar appearance, because this cannot cut corner. To cut corner, need the special processing that such as discharge machines, this virtually raised cost.2.If there is a problem on the design, had better end panel opens appearance of this kind of pocket. Below the circumstance of the end panel that close, the irruptive treatment that must have a tool first (namely cutting tool should machine size extent downward, move again next) , work efficiency can become low.Same, below the circumstance that machines wide chamfer, bigger R will produce taller treatment efficiency and lower finished cost. Because you can use the cutting tool of big diameter to reduce the number with mobile reciprocating type,this is. Accordingly, if the design does not have a problem, had better appoint in the graph as far as possible big R.3. to a few spare partses, need from semifinished product face (or rough machining face) treatment comes target dimension. If material (semifinished product) ply exceeds target ply, criterion finished cost is met heighten. Because this should pass a consideration " mental allowance " come set board is thick, choice ply is close to the material of target dimension. Mental allowance (or surplus) it is the cutting surplus before reaching target size. For example, following plan institute are shown, when the material cut of the 12mm that is 10mm from target dimension, mental allowance is 2mm.Patulous knowledge: "Mental allowance " with " finish machining surplus " different. Undertake rough machining from the material before treatment, quantity of the rest of the rest below the condition before finish machining is finish machining surplus. Although depend on,machine a method, but finish machining surplus comes for 0.1mm normally 0.5mm. 4. The width of requirement measure and appearance precision should be inside the limits that the spare parts can work as far as possible narrow. Through making its narrower, can reduce cutting cost, because it can use milling cutter cutting. On the other hand, if the width of claimed accuracy increases, criterion milling cutter must reciprocate for many times, raised finished cost then.5.Below the circumstance of the figure that shows as follows, if do not have design problem, choose appropriate cutting tool. Pass appropriate cutting tool, can eliminate the need and reduces a worker man-hour that changes to cutting tool, reduce cost thereby.6.Dimension public errand depends on the dimension of the spare parts, but considering machine norms, should maintain in ± 0.02 less than. This is an experience law, but if need taller precision, criterion finished cost will be very high. For example, below the circumstance of ± 0.1mm, can undertake metrical with vernier calipers, but ± 0.02 undertake very hard metrical with vernier calipers. Precision is taller, finished cost is higher. It is so when scale blueprint, should choose appropriate precision, avoid precision exorbitant. The little skill that machines about milling shares here, insufficient place, welcome everybody to leave a message comment!
