Numerical control machine tool machines craft

Craft of treatment of numerical control machine tool involves an area wide, and influencing factor is much, when undertaking to workpiece craft is analysed machining, should consider the treatment characteristic of numerical control machine tool more. When the spare parts is machined on numerical control lathe, should follow following principles: (1) the part that the choice fits to be machined on numerical control lathe. (2) the analysis is machined part drawing appearance, machine content and technical requirement clearly. (3) certain work coordinate fastens origin seat. Origin position chooses to be in commonly workpiece right end panel and P of node of main shaft centre of turning circle, also can set on main shaft centre of turning circle and O of node of workpiece left end panel, if pursue,1 is shown. Graph origin of 1 process designing (4) make treatment craft way, should consider to machine initial drop position, initial drop also regards treatment as the position of the end commonly, dot having city should facilitate examination and outfit place workpiece; Should consider line of thick car, half fine vehicle, fine car, below the premise that makes sure the spare parts machines precision and exterior surface roughness, complete the treatment of the spare parts with least feed course as far as possible, shorten odd handling time; Lv of take an examination changes the position that the knife nods, the dot that change a knife is the place that the tool carrier in machining a process has changing a knife automatically, the Lv of choice take an examination of position of the spot that change a knife is changing a knife interference phenomenon does not produce in the process, and the course that change a knife as far as possible short, treatment is initiative nod and change a knife to nod optional and same point to perhaps be not chosen nod together. (5) choice cutting parameter. In machining a process, speed of the main shaft rotate speed that should ask according to spare parts precision the choice is logical, feed, with cutting deepness. (6) logical choice cutting tool. According to the spare parts appearance of treatment and exterior precision requirement, choose appropriate cutting tool to undertake machining. (7) work out machine program, debug machine program, the spare parts that finish is machined. 1.

The dimension in analysing part drawing tags a method with same and fiducial bring the method that note size or tags coordinate dimension directly to be unified and fiducial tag a method, this kind tags a method (the graph is shown 1 times) most the treatment characteristic that accords with numerical control machine tool, go to the lavatory already process designing, preserved a design again craft is fiducial, fiducial, measure fiducial the consistency that installs with workpiece origin. And when design personnel is tagging dimension, more consideration assembles the element with application characteristics respect, often use what bureau part comes loose to tag a method (the graph is shown 2 times) , this kind tags means to bring a lot of inconvenience to working procedure arrangement and numerical control process designing, the ministry tags appropriate general bureau dispersedly methodological instead is unified and fiducial tag a method, because CNC Machining precision is reached,repeat fixed position precision very tall, unified and fiducial tag a method to won't produce bigger accumulation error. 2.

The geometrical element condition that analyses the geometrical element requirement that makes spare parts rough sketch to make spare parts rough sketch is the important basis of numerical control process designing. Computation wants to form the each node coordinate of spare parts outline when manual process designing, want to have a definition to making all geometry element of spare parts outline when automatic process designing, if some condition is inadequate, the node coordinate of outline of imponderable spare parts and the geometrical element that convey spare parts outline, bring about cannot undertake process designing, because this blueprint ought to be conveyed thoroughly,make the geometrical element of spare parts outline. 3.

The craft sex that analyses work structure 1) be like,the lumen of workpiece and appearance should adopt unified geometrical type and measure as far as possible: The axial shoulder with the about the same diameter on same axis retreats the width of knife chamfer to should consolidate measure as far as possible, can reduce the norms of cutting tool and the number that change a knife so, convenient process designing and raise numerical control machine tool to machine efficiency. 2) the chamfer inside workpiece reachs the transition between predestined relationship board the bulk that round horn radius should not spend Xiaoguo to crossed round horn radius to mirror cutting tool diameter, cutting tool diameter and be machined of the deepness of workpiece outline concern than the stiffness with cutting tool, if graph 3a place is shown, when R ＜ 0.

When 2H (H is by the deepness) of face of treatment workpiece outline, decide this workpiece the treatment craft sex of this place is poorer; If graph 3b place is shown, when R ＞ 0.

When 2H, criterion the equivalent stiffness of cutting tool is better, the treatment quality of workpiece can get assuring. 3) if the graph is shown 4 times,radius of round horn of workpiece bottom land shoulds not be too big, when milling workpiece bottom is flat, the R of round horn radius of bottom land is bigger, milling cutter carries the ability of blade milling plane to jump over difference, milling cutter and the D=D-2r(D of the biggest diameter that milling plane contacts are) of milling cutter diameter, when D is certain, r is bigger, the area of plane of milling of blade of milling cutter end is smaller, the ability that machines the surface is reduced accordingly. 4) the dependability CNC Machining with standard fixed position of analytic spare parts should use unified standard fixed position as far as possible, because of,meet otherwise the install fixed position error and causes workpiece treatment position error of workpiece and appearance error. If need to be machined to workpiece tune on numerical control machine tool, the circle outside had better choosing what already machined or already machined inside aperture serves as fixed position fiducial. If did not answer the setting is auxiliary and fiducial, increase craft protruding stage or opening of the craft that make on semifinished product when necessary, what what the reconditioning after treatment ends sets is auxiliary and fiducial. CNC Milling