Rotate speed of contemporary lathe main shaft rises with each passing day, the development that is centrifugal clamping apparatus and applied promotion offerred very good condition. But, for the workpiece outfit clip that locates to less than aperture, traditional centrifugal clamping apparatus can get used to the workpiece of lesser diameter only. Because diameter of the aperture inside workpiece is bigger,this is when, certainly will causes installation centrifugal heavy piece partial structure size is too enormous. Cause the prime cause with this part too enormous size, in depending on traditional and centrifugal clamping apparatus centrifugal heavy piece, either forthrightly action at workpiece wall, deliver through the orgnaization however to clamping unit hind again action at workpiece wall. This limitted the applied scope of centrifugal clamping apparatus greatly undoubtedly. Before this, the person such as Zhong Kang civilian, Guo Peiquan put forward will centrifugal clamping apparatus medium centrifugal heavy piece, cent of according to function is weighed to gain strength piece weigh with drive piece, set the tentative plan of the orgnaization that gain strength between both, make use centrifugal clamping apparatus to installed the work with greater diameter of the aperture inside clip to become a possibility. We want to introduce below, it is the working principle of clamping apparatus of the aperture inside the centrifugal type that is based on inclined wedge to add force orgnaization and mechanical computation problem. Graph the working principle of clamping apparatus of the aperture inside the centrifugal formula that principle of job of graph of 1 job principle uses inclined wedge to add force orgnaization sees a picture 1. By the graph 1 visible, two kinds when this clamping apparatus has a function to differ centrifugal heavy piece -- add force to weigh piece weigh with drive piece, what force orgnaization has power is add to deliver through inclined wedge between both; Add force to weigh piece weigh with drive piece Zhou Xiangwei buy and athletic way, by secure what go up in clamping apparatus body is oriented annul affirmatory. When regular job, drive is heavy piece outside circular arc face and workpiece wall maintain a contact from beginning to end, and add force to weigh piece with workpiece wall do not contact from beginning to end. Workpiece passes with finish machining or semifinishing machining inside aperture locates on clamping apparatus body, the clearance between both is lesser; And clamping apparatus body binds go up in lathe main shaft. When rotating with angular velocity W below the drive of lathe main shaft when clamping apparatus body, add force to weigh piece weigh with drive piece produce centrifugal force Fc1, Fc2 respectively. Below the action of centrifugal force, add force to weigh piece weigh with drive piece will move outwards along respective centrifugal direction, drive is heavy piece outside circular arc face is contacted with workpiece wall, bring to bear on to workpiece wall active force F. F of this active force by the following two parts comprise ∶ (the centrifugal force Fc2 that 1) drive weighs an oneself to arise; (2) adds force to weigh the centrifugal force Fc1 of a generation, after gaining strength via inclined wedge, action weighs an athletic way in drive, namely the component of force on the direction of force Fc2, F. Below the drive of the attrition torsion that arises in two equivalence, retrorse force F place, workpiece rotates to synchronism together with clamping apparatus body. After cutting process begins, the attrition torsion that these two equivalence, retrorse force F place produces, the cutting moment of force that resists by cutting force place arises. Those who need an attention is, weigh for every drive piece direct selling an amount is 2 orientedly, and add force to weigh for every piece direct selling an amount is 1 orientedly. Its reason depends on, workpiece is less than Kong Weiji allows to locate on clamping apparatus body, if add force to weigh for every piece direct selling an amount also is 2 orientedly, cannot make sure two drive are heavy piece bring to bear on to workpiece wall equal active force, cannot make sure two drive are heavy even piece can contact with workpiece wall. Still ought to notice in addition, the graph shows clamping apparatus of the aperture inside centrifugal type 1 times is principle sex only. When undertaking particular structure is designed, should weigh to gain strength commonly piece, drive is heavy piece wait for setting guard, weigh a setting return spring for drive. When mechanical computation outputs the computation of force to rotate with angular velocity W when clamping apparatus body, every add force to weigh the centrifugal force Fc1=m1r1w2 of a generation, every drive weighs the centrifugal force Fc2=m2r2w2 of a generation. If oversight force passes the attrition loss in the process, the computational formula that every drive weighs an academic active force to workpiece wall is like type (1) : If Ft=m2r2w2+ M1r1w2 (N) Tga(1) considers attrition loss, criterion the computational formula that every drive weighs a real active force to workpiece wall is like type (2) : Type of Fp=m2r2w2+ M1r1w2 (N) Tg(a+fp)(2) (1) , (in 2) : M1, M2 -- add force to weigh piece, drive is heavy piece quality (Kg) ; R1, R2 -- add force to weigh piece, drive is heavy piece the centroid distance to clamping apparatus centre of turning circle (M) ; A -- academic pressure angle (Rad or ° ) , weigh to gain strength piece on the method extent of oblique plane and drive weigh a motion the acute angle that places between direction; Fp -- the equivalent angle of friction of gyro wheel (Rad or ° ) . Fp=arctg[(d/D)tgf] among them D is diameter of the aperture inside gyro wheel; D is gyro wheel external diameter; F is the angle of friction between gyro wheel and runner shaft. When the computation of drive torsion rotates with angular velocity W when clamping apparatus body, the computational formula that two drive weigh a Tt of academic drive torsion that can arise and Tp of actual drive torsion is like type (3) , (4)(unit N. M) : In type of Tt=µD0Ft=µD0[m2r2w2+ M1r1w2] Tga(3) Tp=µD0Fp=µD0[m2r2w2+ M1r1w2] Tg(a+fp)(4) : µ -- drive is heavy piece outside the coefficient of friction between circular arc face and workpiece wall; D0 -- workpiece internal diameter (M) . (1) ～ (in 4) type bracket hind: M1r1w2/tga reachs M1r1w2/tg(a+fp) , add force to weigh the centrifugal force Fc1 of a generation namely, after gaining strength via inclined wedge, action weighs an academic component of force on athletic way and real component of force in drive; And It reachs the academic coefficient gaining strength that 1/tga and 1/tg(a+fp) are inclined wedge to add force coefficient Ip actually. Because the value of A of academic pressure angle is desirable lesser (recommend take Amin=8 ° ) , so, inclined wedge adds force orgnaization to be able to obtain the bigger coefficient that gain strength. Set for example: A=8 ° , d/D=0.
30, tgf=0.
10(fp=arctg0.
03=1.
72 ° ) . The theory of inclined wedge adds force coefficient It=7.
12, add force coefficient Ip=5 actually.
84. It is very remarkable that its add strength effect. And the coefficient that gain strength means the drive torsion that can get undoubtedly greatly big. If cannot be satisfied via the drive torsion that computation produces,machine a requirement, but from the following two respects take step: A place that contacts with workpiece wall is weighed to use the data with bigger coefficient of friction in drive; In add force to weigh the stuff with an in-house and built-in older density, if increase aggravating metal lead,wait. Epilogue inclined wedge adds force orgnaization texture simpler, and have add force function times higher; Its add strength effect to be decided by the equivalent angle of friction of its theory pressure angle and gyro wheel. Be based on inclined wedge to add the centrifugal clamping apparatus of force, because drive is heavy piece contact with workpiece wall directly, structure of more traditional centrifugal clamping apparatus is compact, make clamping apparatus bulk contractible thereby. Be based on inclined wedge to add the centrifugal clamping apparatus of force, because drive torsion is bigger, can weigh the work with a greater dimension of direct clamp aperture with its drive inside aperture. CNC Milling