Machine tool of new-style series connection suffers mechanical set beforehand analyse

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The 3 translation freedom that institute of plan of 1 total distribution develops spends shunt-wound machine tool to use 3-HSS form model (here, h is helix deputy, s is spherical deputy) , by base, move platform and ― of saddle of ― of 3 contrary column to raise catenary to comprise; every lever of 3 parallel fixed length is contained in paying chain, each lever one aspect of the matter and saddle, another end and move platform to use ball bore with a reamer (or Hu Ke bore with a reamer) join, saddle is mixed by servo electromotor deputy drive of nut of ball guide screw, along installation the scroll slideway on pillar makes fluctuation move. Get stuck along flute only to make use platform it is 3 direction translation, 3 lever in making pay chain each keep parallel on the structure, form an equilateral triangle with saddle and the point of bore with a reamer that move platform, form structure of dimensional parallelogram rigid frame then. This machine tool basically is used at mill of 3 coordinate high speed, boring, grind treatment, yi Ke deserves to finish much coordinate different curved surface and cutting tool blade to grind with stage of numerical control circumgyrate. Afore-mentioned overall design program have the following advantage: (1) drew lessons from structure of maturity of saddle of ― of pillar of milling machine of lifting platform type, facilitating leader plant is made with off-the-peg craft and assemble. (2) work space submits column form, have larger process designing space and machine tool bulk to compare, and parallel is equal at the kinematic function with workbench sectional random. (3) position and speed, go against solution to all have explicit and analytic solve, can carry out fast PVT interpolation and online kinematic demarcate. (4) raises catenary to use the structure of rigid frame of 3 lever parallelogram that takes inactive obligation, not only can eliminate hinge gap effectively, and can rise substantially move platform to resist cutting overturns the ability of pitching moment. (5) is mixed except base outside using platform, main structural member all is 3 semmetry, can reduce component to the design works and make cost substantially. Principle of 2 kinematic designs 2.

1 position goes against solution model position to go against solution to involve scale of foregone machine tool parameter and use position of platform reference point, seek saddle seat instead, its purpose has 2: It is foregone CAM model hind is servo control to offer necessary input; through thick interpolation 2 it is to be the measure that is based on nimbleness index to provide mathematical model integratedly. Because use a parallelogram to raise catenary structure to make catenary medium each lever motion curve is equal, reason is when kinematic analysis the equivalent orgnaization that can simplify former orgnaization to be shown to be like place. Mix in workbench moving platform to go up to build fixed reference respectively is fasten O ′ with the reference that join system - ′ of Z of ′ of X ′ Y, an arrow that dot O ′ issues in department O-xyz can express O-xyz and O ′ - the positional vector;ra of ′ of Z of ′ of X ′ Y, Rb is move, ;i of static platform radius is Bi and bit of Ai to be in O-xyz and O ′ - ′ of X ′ Y, and the unit vector;L that 1=-6 (i-1)23wi is the I that pay chain grows;qi to be saddle I to support chain staff the displacement;e3=(001)T relative to reference point Bi. To type two end take a model to just arrange a basis to assemble mode to be able to be solved. 2.

2 nimbleness analyse nimbleness (the main index that Dexterity) is precision of motion of machine tool of evaluation paralell connection, usable use platform three-dimensional Cartesian rate moves to saddle the map matrix of speed -- the conditional number of Jacobi matrix comes token. Conditional number is smaller, show a machine tool (machine tool function it is action of machine tool furniture all in all) academic servo precision is taller, because this can regard the design of structural parameter as criterion. Beg about time to type guide, in the rate that gets nodding O ′ , qi is the floating rate of saddle I, I is the angular velocity vector of the I that pay chain. To going up two end points accumulate type Wi is written into matrix form in, q=(q1q2q3)T, j is Jacobi matrix. In begging the requirement that understands following diagnostic equation to be able to solve a J to count, I is the I(i=1 of JTJ, 2, root of 3) rank feature. 2.

3 works space works integratedly the purpose with integrated space is, give process designing space those who move hinge of platform radius Ra, ball is allowable half cone angle 1, when ′ of the O that seek a site is located in on Z axis, the included angle of Wi and Z axis 0, staff grows L and saddle journey S. For this, will adapt above all in be R=Lwi R0i type, r0i=bi-ai Qie3 reservation raises catenary to I and the bore with a reamer that use platform are restrained and see an other, after giving Qi, the contrail that nods O ′ can regard as with R0i arrow end is the centre of a circle, what be radius with L is spherical piece. By positional space compositive principle is known, nod O ′ can amount to a space to be all be mixed that raise chain space. Attack according to the develop of the machine tool structure, might as well the process designing space of ′ of the O that establish a point is radius the cylinder to be H R, high, and your its and can amount to receive inside the space. Notice each catenary can amount to child the space is the least sectional and certain inside the plane in R0i and Z axis Zhang Cheng, reason undertakes analyse can be gotten gyral. The bore with a reamer that set a ball is allowable half cone angle is 1, and chain rivet line and ball bore with a reamer are raised to install coincide of planar law arrow when nodding O ′ to be on Z axis, criterion geometry concerns so that to going up type arranges to be able to solve the journey that stemming from is saddle to be able to be decided by next type the basis is installed moving the end-effector on platform (the main shaft that be like report) dimension, give move platform radius Ra, radius of static platform can be decided by next type design a standard according to numerical control machine tool again, workbench face height is apart from to be S3 ≥ S1 when setting bit of O ′ to fall to lowest, criterion the academic height of the machine tool should inspect type to see for H=s3 Lcos0 H S2, should give R, H, Ra and 1 hind, l, Rb, S and H all are the function of 0. Macrocosm of number of the condition inside aleatoric plane is the smallest show along with the metabolic rule of 0 with maximum when going out to should take 1=25 ° , in the condition of the Jacobi inside aleatoric plane number is in of brim of process designing space the biggest with the least value Wmax, Wmin and value W0 is taken to follow the metabolic pattern of 0 in dimensional center. See by the graph, the nimbleness of 0 unwarrantable macrocosm that uses nimbleness isotropy condition to go out integratedly is best. For this need construction is as follows Min of → of SW-WdsS of ∫ of target functional J=tWmax (1-t) passes one dimension to search actor to decide 0. Here, t is authority coefficient, w counts for the condition " centre of gravity " . S is process designing space sectional area. The meaning of afore-mentioned function index can explain for: Make maximum of conditional number macrocosm and its are adding authority meaning to fall about quadrature of deviation of centre of gravity the smallest. 3 projects example sets process designing space to be the cylinder of 500mm × 400mm, move platform radius to be Ra=115mm according to make choice of of dimension of electric main shaft, bore with a reamer extraction a ball makes 0=37.

When 6 ° in random of process designing space number of the condition inside plane follows a drop metabolic rule is 1=25 ° with half cone angle. Consider process designing space and machine tool bulk are compared, take T=0.

2.

Be searched via one dimension and the circle is full, get J obtains minimum to be worth parameter of a group of structures making: 0=37.

6 ° , l=900mm, s=834.

7mm, rb=664.

1mm is shown went out in random of space of prototype process designing number of the condition inside truncat face follows a drop distributinging rule, show gave process designing the space includes with what can amount to a space relation. 4 conclusion put forward to spend shunt-wound orgnaization to make with can realizing the 3 freedom of translation give priority to feed orgnaization, complementary the shunt-wound machine tool that spends freely with roll of circumgyrate workbench implementation is overall distribution plan. This plan has the control solving Ou that can realize translation and roll, and working space is mixed greatly can recombine a gender to wait for an advantage by force. To 3-HSS compose model, can use macrocosm nimbleness best index undertakes kinematic design. CNC Milling CNC Machining