Numerical control establishs a car special fixture design

06mm, kong Yuanzhu is spent inside 0.

087mm, go up, next inner cone aperture are average diametical 110mm. According to over all dimension knowable, this workpiece can be in CK815E numerical control is machined on lathe of Chan Zhuli type. The clamp centering way that if still use workbench of primary machine tool,workpiece blocks outside card claw, undermentioned defect overcomes hard: ① because the craft of clamp workpiece is fiducial as fiducial as the design that machines aperture departure, the coaxial of the aperture inside treatment and fiducial aperture spends requirement Ø0.

06mm assures hard. ② clip holds Bao Bi easy generation is out of shape, treatment aperture cylinder is spent 0.

087mm assures hard. ③ installs clip to search to assisting time to grow, cannot satisfy car product line " efficient, fast metre " need. Because this needs to add a hydraulic pressure to block close unit on foundation of workbench of this machine tool, this clamping apparatus needs to satisfy undermentioned requirement: The cylinder that ① assures to the coaxial that machines aperture and fiducial aperture spends requirement and oneself spends a requirement. ② clamp safety, reliable, namely clamping force is enough big. ③ satisfies need of clamp of work of type of 3 kinds of different specifications. ④ disassembles, installation, search workpiece assists time weak point. ⑤ maintenance, change fragile a seal ring is convenient. 1.

Main shaft 2.

Axis distributing oil 3.

Seal ring 4.

Oil cylinder body 5.

Piston 6.

Piston lever 7.

Apply the brake rouses assembly 8.

Flashboard 9.

Awl is covered on 10.

Next awl are covered 11.

Centering covers structure of hydraulic pressure clamping apparatus to pursue structure of 2 clamping apparatus is opposite characteristic of craft of typical workpiece cold working relapses on the foundation of analysis, research, clamping apparatus (see figure) use workpiece main aspects to start to talk up, the cutting of from above to below of vertical tool carrier machines means, installation of device distributing oil is in upside of workbench main shaft, installation of clamp oil cylinder is in workbench upside, workpiece reposes in the integral layout means of upside of clamp oil cylinder. Means of layout of this clamping apparatus is like next characteristics: ① satisfied the requirement of precision of the aperture inside typical workpiece treatment. Awl is covered on 9, next awl cover the cone angle of 10 to deserve to grind by taper of border of the Kong Shi inside typical workpiece, make sure osculatory rate achieves 80% above, the centering between clamping apparatus and workbench stops buccal high accuracy cooperates, workbench center aperture is assembled from the car. Make through afore-mentioned measure center of the aperture inside workpiece treatment, next inner cone on workpiece are fiducial aperture center, workbench centre of turning circle keeps consistent, the cylinder that made sure the coaxial between the aperture inside workpiece treatment and fiducial Kong Zhi spends the aperture inside requirement and workpiece spends a requirement. ② clamp on the safe side. Because clamp oil cylinder is decorated in workbench upside, made full use of the space of workbench center aperture, the diameter of clamp oil cylinder that can choose ideal in order to satisfy the need of clamping force. On, next awl are covered 9, 10 departure have notch, when the cant when impaction can more close together ground is pressed close to go up in the cant of workpiece, increase attrition power. ③ can satisfy the clamp need of work of type of 3 kinds of different specifications. This clamping apparatus designed 3 to go up in all, next awl are covered 9 with 10, can change to differ in order to satisfy clamp conveniently the need of workpiece. ④ disassembles, installation, search the auxiliary time of workpiece is short. In hydraulic pressure a powerful person control falls when workpiece clamp, the end on oil cylinder is connected have pressure oil, piston pull rod 6 taut on awl covers 9 workpiece to be secured firmly cover in centering 11 on; When workpiece is loosened, oil cylinder lower end comes oily, piston pull rod moves up, will go up awl is covered 9 at the same time the top goes out, tear open next getting on awl covers the flashboard of 9 horse's hoof form above 8, pull out on awl is covered 9, right now dismountable workpiece. Because this clamping apparatus used the clamp means that workpiece places inside automatic centering, shortened installation, search the auxiliary time of workpiece. ⑤ maintains a machine tool to go to the lavatory. Because this clamping apparatus is decorated in workbench bottom, can change conveniently fragile a seal ring. Additional, device distributing oil and span of oil cylinder body are small, cantilever of axis distributing oil is short, the radial when circumgyrate is jumpy small, prolonged the service life of seal ring relatively. Main shaft of ⑥ machine tool is the body distributing oil of device distributing oil namely, raised main shaft stiffness, make pipeline coupling more simple, lid of the end on oil cylinder is covered for centering namely, oil cylinder system stops through centering the opening is immediate close to go up in workbench. Adopt afore-mentioned clever designs, raised the centering precision of this clamping apparatus, satisfied the treatment precision requirement of the spare parts. The SYPz of · of TXPz of · of Pz Pz= CPz of computational cutting force of force of cutting of 3 designs computation and cutting torque the T in type of · KµPz (N) (1) -- cutting deepness, mm. T=1.

5mm S -- feed, mm/r. S=0.

8mm/r typical workpiece is cast-iron, use the opening inside turning of hard alloy cutting tool, check take each coefficient to be: CPz=902, XPz=1, YPz=0.

75, kµPz=1, era enters type (1) gets Pz=1145N. M of torque of the biggest cutting cuts M to cut =PzD work -- , workpiece of the D in 2(2) type -- the hole inside workpiece is the largest treatment diameter, d workpiece =0.

37m generation enters type (2) gets M to cut =211.

8N · M. F of piston lever pulling force is pulled and the M of computational attrition torque of oil cylinder of D of oil cylinder diameter rub take M rub =S · M is cut (the S in 3) type -- safety factor, s=1.

3 generation enter type (3) gets M rub =275.

34N · M. F of cone attrition force rub F rub =M rub / 2 -- , D awl / awl of the D in 2(4) type -- cone average diameter, d awl =0.

11m generation enters type (4) gets F rub =2503N. F of piston lever pulling force pulls F to pull =F rub -- , the A in type of Sina · µ(5) -- cone angle, a=30 ° µ -- coefficient of friction, µ=0.

15 generation enter type (5) gets F to pull =33373N. =[4F of oil cylinder of D of oil cylinder of D of oil cylinder diameter is pulled + D lever 2]½ -- lever of the D in PP(6) type -- piston shank diameter, take D lever =0 via computation.

04mP -- force of pressure oil pressure, p=3.

Generation of 5 × 106N/m2 enters type (6) gets =0 of D oil cylinder.

1172m. =0 of oil cylinder of D of oil cylinder diameter is taken in the design.

12m. In =0 of D oil cylinder.

When 12m, m rub =284N · M. M rub > M is cut. This clamping apparatus and primary machine tool are assembled together, try cut workpiece to succeed, leave factory smoothly, already bound now go up in car product line, formal devoted production is used, get the user agrees reputably. CNC Milling