Private plane of milling of face of compressor impeller circular arc is designed

0110Ø1050-0.

008777.

5252Ø16+0.

018+0.

005Ø90 ± 0.

0438035 graphs the compressor impeller of 1 impeller 6160A and 6200Z diesel engine, spare parts structure and figure are similar, function is same, but measurement is different (if pursue,1 shows) . The requirement designs milling of a special machine tool the face of impeller circular arc with two kinds of different measurement (radius is R) . The technology of impeller spare parts asks impeller material is ZL104, hardness ≥ 70HBS, circular arc face (the cross section that radius is R) and inside aperture (the coaxial for D) spends the diameter to all be Ø0.

04mm, exterior surface roughness is Ra1.

6µm. Because impeller is the spare parts that high speed rotates, to its dimension precision, appearance precision and dynamic balancing precision ask taller. Of the choice impeller with standard fixed position inside aperture (the thick, finish machining that the diameter is D) and face of Ø150mm main aspects all installs treatment to finish in same process, in order to assure main aspects face and inside the verticality of aperture axes asks (150mm end panel beats allow is differred 0.

02mm) . When face of milling circular arc, all choose face of Ø150mm main aspects to serve as the first fixed position fiducial, spend in order to eliminate 3 freedom of impeller (the shift of axes of the aperture inside the edge, circle other the rotational) of two vertical axes: Less than aperture is the 2nd fixed position fiducial, eliminate the shift along two vertical axes. From theoretic tell fixed position can satisfy treatment requirement at 5 o'clock. The design program analysis of 2 milling private plane and plan of adopted design of measure cutting tool and requirement of height of centre of turning circle of measure cutting tool are adjustable, the tool carrier after mix up asks can locking. Graph component of 2 tool carrier is local graph the means that 3 mill clamping apparatus uses tool carrier of similar gear-hobbing machine to adjust, set on pillar adjustable tool carrier (if pursue,show) 2 times. When cutting tool center high-key arrive after appropriate height, at the back of locking pillar slideway pressure piece, in order to eliminate the gap between cutting tool and pillar slideway, raise bearing thereby tigidity and fight brace up ability, also assured the circumgyrate precision of cutting tool. Milling of circular arc face uses columnar milling cutter, milling cutter radius depends on R of radius of circular arc face to choose. Milling cutter asks to be able to be changed, arbor tigidity is close friends, and should avoid cantilever construction, lest cause vibration to let a knife because of cutting, affect circumgyrate precision and exterior quality. Use the bearing means of bracket of cutting tool of all-purpose milling machine then, bearing of rear push frame is installed in arbor tail end, in order to raise the tigidity of cutting tool system. The milling head TX25A that chooses high accuracy regards cutting tool as actuating device, in order to raise the circumgyrate precision of cutting tool. Head of this kind of milling contains the biserial of 3182000 series is afferent bearing of short columnar roller and thrust ball bearing, circumgyrate precision is tall, it is good that precision maintains a gender. Create technical demand by ZB2651, its circumgyrate precision can assure to be in 0.

In 01mm. Send into to making sure the circumgyrate precision of workpiece is reached adopted following measure: ? The hydraulic pressure slip of Mo of horsefly of cangue of Nai of ≡  climbing over a wall slideway, the twist of slideway is 0.

01mm/250mm, in order to assure the flatness that workpiece sends, be helpful for raising the circumgyrate precision of circular arc face. The step that raise workpiece circumgyrate precision and takes uses the milling head TX20A of high accuracy to make the actuating device of clamping apparatus, its circumgyrate precision is in 0.

In 01mm. Raise the centering precision of clamping apparatus arbor. Use adjustable and coaxial spent clamping apparatus and can change, in order to get used to two breed the need of much even breed. The join of clamping apparatus and milling head does not use 7:24 taper aperture. The production method with this kind of current taper hole can make sure interface is amounted to only 80% the left and right sides, satisfy the requirement of tall circumgyrate precision very hard. Use flange to stop on clamping apparatus then mouth and milling head connection, 4 M8 are set to adjust bolt in radial (like the graph 3 show) , adjust the centering precision of its arbor. Through fine adjustment, the radial and jumpy control of clamping apparatus arbor is in 0.

In 005mm. Control the public errand of arbor diameter to facilitate, fixed position aperture (Ø16+0.

0110mm) conversion becomes two-way deviation, it is Ø16 namely.

0055 ± 0.

0055mm, can reduce the fixed position error of because of the production error of spare parts aperture generation so. Had made fixed position processing to fixed position arbor, in order to raise the tigidity of location system, reduce cutting metabolic effect. The basis located at 6 o'clock principle, fixed position arbor eliminates two freedom to spend, can use short columnar arbor only. Because this arbor still needs clamping unit, the part that does not make fixed position so can the car is fine, have larger space with the Kong Liu inside workpiece so. Through actual try out, the radial that discovers circular arc extent is jumpy for 0.

07mm, exceeded radial and jumpy allow to differ 0.

The precision of 03mm asks, exterior surface roughness also can amount to Ra3 only.

2µm, short of blueprint asks. Classics analysis, because locate arbor fixed position cooperates face length shorter, arbor does not locate the aperture inside part and workpiece has larger space, below the action of radial cutting force, arbor produces bending to be out of shape, and workpiece also loses bearing action in clearance place and generation is out of shape, cause cutting thereby brace up quiver, affected treatment precision. As a result of Ø150mm old plane and fixed position aperture (the verticality that the diameter is D) is controlled completely in 0.

In 02mm, we had used fixed position arbor to have a test. When designing fixture, locate with old plane and lengthen arbor combination (like the graph 3 show) , make the aperture inside workpiece cooperates fixed position with arbor inside full-length limits. After such processing, the radial and jumpy classics that machines the side of impeller circular arc that give detects amount to 0.

012mm, achieve blueprint requirement completely. The installs scale of methodological impeller circular arc treatment of the use of 3 cutting fluid and machine tool uses engine oil cooling and lubricant cutting tool, the generation on cutting tool accumulates bits tumour and affect treatment surface quality in order to avoid. Via determining exterior surface roughness achieves Ra1.

6µm. The installation of the machine tool imposes the installation kind of foundation bolt without the ground that takes a tradition, use the JZQ-I that machinery plant of Shanghai long march produces stretch bearing however. Every bearing loads 200kg, this machine tool is common 6 bearing. This kind of bearing saved 50% installation cost not just, and shortened greatly installation adjusts cycle. And the most important still is this kind of stretch bearing have decrease brace up with vibration isolation action. Reduce the vibration of machine tool oneself on one hand, keep apart the vibration that outside equipment transmits through foundation on the other hand, be helpful for improving treatment quality thereby. 4 effects because the centre height of cutting tool is adjustable, the centering precision of clamping apparatus arbor is adjustable and clamping apparatus can be changed, realized one machine a variety of spare parts treatment. The milling head that uses high accuracy serves as the actuating device of cutting tool and workpiece, the centering precision of clamping apparatus arbor is adjustable, assured the dimension precision of face of impeller circular arc and positional precision. The crosses location design, machine tool stretch bearing of clamping apparatus reachs the use of cutting fluid, avoided cutting vibration, made sure surface roughness of circular arc face asks. Through use proof of a few years, this machine tool is had cabinet and reasonable, compact, character of service stabilizes the structure to wait for an advantage reliably, can assure the milling quality of face of compressor impeller circular arc completely. CNC Milling