Exceed the treatment of canister of small diameter crock

My factory carries on those who introduce casting die of fluid of part of rice transplanter of Korea MSP-4U paddy is homebred change manufacturing job, what control fry box to control shift among them is transverse move send oil cylinder, because cylinder diameter is small (Ø20mm) , distance is long (difficulty of 300mm) , treatment is very great. Through serious research, design computation repeatedly, combine my factory to machine the experience of canister of crock of Ø40mm hydraulic pressure, experiment for many times, solved this one difficult problem eventually. The treatment working procedure of canister of crock of hydraulic pressure of method of 1 boring treatment is thick boring commonly -- , boring of essence of life -- , boil pressure, in bore hole level, must achieve taller precision, circularity is less than be equal to 0.

01mm, cylinder is spent be less than be equal to 0.

05mm, achieve certain exterior surface roughness to be worth Ra3.

2 ～ 1.

6µm, repass boils press treatment ability to make high grade hydraulic pressure oil cylinder. The stiffness of the arbor when canister of long and thin crock bores hole is crucial, around this one crucial question, machining Ø20 × 300 transverse move when sending oil cylinder, we took the way to deal with a situation of 3 respects. Graph 1 division too gram 1.

The head of a bed 2.

Arbor 3.

Oriented cover 4.

Workpiece 5.

Clamping apparatus 6.

Feed box 7.

Lathe bed pursues 2 divisions too gram 1.

Nut is adjusted before 2.

Roller 3.

Arenaceous frame 4.

Thrust bearing 5.

Nut is adjusted after 6.

Locking is nailed 7.

Cutter hub 8.

Sheeting 9.

Bolt pursues 3 divisions too undertake norms is Ø28 × controlling choosing on semifinished product of gram head preexistence 5, the hot-rolling seamless steel tube that material is 45 steel, the mental allowance that makes bore hole is in 1 ～ 1.

5mm left and right sides. Undertake to semifinished product before treatment alignment is handled, make its linearity is less than 0.

3mm, fall the cutting tool bear when cutting to lowest so, make fine arbor also can have bigger stiffness. Rigid boring cutter (1) seeing a picture this kind of cutting tool can mix thick boring two working procedure finish boring of essence of life. It is mixed by knife head two parts comprise arbor, knife head and arbor use detachable formula, double columnar centering, have taller repetition fixed position precision. Bit directs with what grow 40mm twice piece use hard alloy data, solder to go up in knife head, arbor is external diameter Ø18, the hollow lever of internal diameter Ø8. Cutting fluid from hollow arbor direct eject comes treatment area, refrigeration and lubricant cutting tool are swept cut bits. Is the main parameter of cutting tool as follows: ? 8 ° of ～ of ° of Ao Qia =5, hind 8 ° of ～ of horny B=5 ° , ° of K=40 of tool cutting edge angle, transfer K of blade tool cutting edge angle ' =16 ° ' 15 ° of ～ of ° of blade dip L=10, xiu Guangren grows 3 ～ 4mm, point of a knife should relatively bearing blade lead 1 ～ 2mm. Cutting speed takes 18 ～ 30m/min, feed 0.

08 ～ 0.

15mm/r. The tool that crock canister machines (the head of a bed of 2) seeing a picture 1 provide power for cutting tool, shuttle table 6 belts begin construction a feed, oriented set 3 offer bearing for cutting tool and its are to direct before knife head enters work. After cutting tool enters work by already machined aperture to direct. Cutting fluid is in by arrowhead via hollow arbor, enter cutting area with regular pressure in season, direct cooling is lubricant cutting tool, sweep cut bits. 2 rolling the construction that controls treatment to roll pressure head to roll the key that press is to make roll pressure head, its structure sees a picture 3, cutter hub 7 it is the skeleton that rolls pressure head, its right end is OK with the graph the arbor of the rigid boring cutter of 1 connects, its connection whorl and fixed position stop buccal homogeneous phase is the same as, cutter hub center has opening, cutting fluid can flow into treatment area through here. Nut is adjusted before 1 nut is adjusted after mixing 5 pass whorl connection with cutter hub, two are adjusted is roller between nut 2, arenaceous frame 3 with thrust bearing 4. Roller lies on the taper seat of cutter hub, whole nut of modulate coming back makes roller axial moves to be able to adjust those who roll pressure head to boil control an amount. Sheeting 8 with bolt 9 use at securing roller, make its are in do not fall off at ordinary times, locking is nailed 6 use at locking to adjust nut. This rolls pressure head to be told from the structure not special, but because its are radial size is small, expended a few idea quite when planning each part measure, make because its are too fine,cutter hub does not come already and cannot deliver enough torque, also make adjust nut and arenaceous frame cannot because its are too thin and without intensity. The course decides roller diameter Ø4 after computation repeatedly, tone nut is M12 × before 1.

5 whorl, nut is adjusted to be M14 × after 1.

5 whorl. The conic main aspects on cutter hub is Ø12.

5, taper 1:40. Does the use that rolls pressure head roll the adjustment of pressure head to measure: ? Closely question weak point is tranquil 12 × of Mo 1.

5 with M14 × 1.

Ground of the divide into equal parts on whorl of 5 two place opens 4 slot each, adjust the apart on nut 135 ° get two M3 screw, adjust nut to rotate so 45 ° , the screw of M3 has a corresponding chamfer, locking hammer supports inside groove, assure to adjust nut reliable locking. Because adjust pitch,be 1.

5mm, conic taper is 1:40, the smallest regulated quantity is roller radial 0.

0047mm, adjust nut to turn circuit roller regulated quantity is 0.

0375mm. Cutting dosage: ? Ba is employed model wish? of class of  of Zi filling  .

06 ～ 0.

18mm: Main shaft rotate speed: 280 ～ 300r/min, feed 0.

08 ～ 0.

12mm/r. This rolls pressure head to be when treatment, use the tool of rigid boring cutter completely. Use same cutting liquid. 3 conclusion course is used, with boring treatment craft, tool machined about a hundred crock canister, via examining circularity error is less than 0.

01mm, cylinder spends an error to be less than 0.

05mm, exterior surface roughness is worth amount to Ra1.

6µm, treatment quality is very stable. Press treatment via boiling again, the value can amount to the exterior surface roughness of crock canister Ra0.

4µm, more the wearability that raised crock canister prolonged service life. CNC Milling