The stiffness of numerical control machine tool reachs the measure that raises stiffness of numerical control machine tool

The configuration of logical choice component (the appearance with 1) right sectional choice and dimension component part are in after bearing to bend and turn round load, its are out of shape size depends on of section fight bend and turn round inertial quadrature, fight bend and turn round inertial quadrature big its stiffness is tall. Watch 1 listed accumulate in section identical (namely gravitational and identical) when the inertial quadrature of each section appearance. The data from inside the watch is knowable: The section with same figure, when preserving same cut area, should reduce a wall thick, increase sectional outline size, the circle is fought sectionally seize stiffness example form sectional big, the stiffness that defy a turn is more sectional than square small; Enclosed sectional stiffness is compared not enclosed sectional stiffness is a lot of bigger; The starting a hole on the wall will make stiffness drops, in aperture the flange on Zhou Jia can make the stiffness that defy a turn gets resumptive. Express 1 section to accumulate identical the inertial quadrature that is each section (logical choice reachs 2) decorate clapboard and muscle reasonable decorate bearing clapboard and muscle, what can raise component part is static, move stiffness. The structure of a few kinds of pillar that the graph shows 1 times, interiorly is decorated have vertical, horizontal stroke and diagonally anything resembling a tendon or vein board, undertake to them the static, result rank that uses stiffness test is expressed 2 in. Among them with alternate muscle board (the action of serial number 5) is best. Nextpage is a few righter thin wall component, to reduce the distortion with the warp of mural face and sectional component, the muscle that the graph shows 2 times can be installed on wainscot, among them better with beehive shape reinforcement, if pursue medium (F) place is shown. It besides can raise component part stiffness, still can reduce the contraction stress when casting. (The slideway of the local stiffness machine tool that 3) raises component part and bearing connection component, often be the part with local the weakest stiffness, but the impact of stiffness of ministry of connection means play a game of chess is very big. Graph 3 gave out a few kinds of forms of slideway and lathe bed connection, if the measure of slideway is broader when, use type of double wall connection, if pursue medium (D) , (E) , (F) . When slideway is narrower, can use single wall or increase thick single wall connection, perhaps add perpendicular muscle on single wall in order to raise local stiffness. (4) is chosen solder the bearing such as the lathe bed of component part machine tool of the structure, pillar, use armor plate and profiled bar solder and become, have the distinct advantage that reduces quality to raise stiffness. The stretch model quantity of steel is about double cast-iron, in appearance and outline dimension identical premise falls, if ask the stiffness of weldment and cast is identical, criterion the wall of weldment is large the in part that wants cast only; If ask local stiffness is identical, become direct ratio because of the cube with local stiffness and large wall, the wall of weldment is so large want cast wall only thick 80% the left and right sides. In addition, no matter be stiffness identical in order to reduce quality, or quality is same in order to raise stiffness, can increase the syntonic frequency of component part, syntonize happens not easily. Solder to make component part the box shape structure that becomes whole sealing likely with armor plate, be helpful for raising the stiffness of component part thereby. 2.

Equitable structural distribution can rise stiffness to be with horizontal boring machine or horizontal machining center exemple undertake an analysis, in the graph 4 bear in form of a few kinds of layout, (A) , (B) , (C) the main shaft box of 3 kinds of plan is bosseyed suspension in pillar flank, of main shaft box self-prossessed will make pillar generation bends be out of shape; Cutting force will make pillar arises to bend and seize change form. These is out of shape will affect treatment precision. Plan (inside the symmetrical face that the center of main shaft box of D) is located in pillar, of main shaft box self-prossessed bring those who remove pillar to be out of shape no longer, of the pillar that same cutting force place causes bend and twist change form to all be reduced greatly, this comparatives child the stiffness that raised a machine tool. Of numerical control machine tool procrastinate board with workbench, as a result of the limitation of structural dimension, ply dimension cannot be designed too greatly, but width or span cannot be reduced again, stiffness is consequently insufficient, to remedy this flaw, outside eliminating dominant course, in dangerous extend place to add auxiliary slideway, can rise greatly procrastinate board the stiffness with workbench. 3.

Adopt measure of structure of compensation component metabolic to become the opposite metabolic volume that can measure an exert oneself to nod and direction, of prescient perhaps component be out of shape when the rule, can collect, take relevant measure to compensate be out of shape with eliminating its are affected, compensatory result was equivalent to raising the stiffness of the machine tool. Be like the large planer-type milling machine that graph 5(a) place shows, move when main shaft component of crossbeam mid when, of crossbeam bend be out of shape the biggest. For this but crossbeam slideway consummate " vaulted " , namely mid for raised parabola form, can make its are out of shape get compensating. Perhaps mix through the auxiliary beam that installs in crossbeam interior beforehand corrective bolt undertakes to dominant course beforehand corrective. Also can use the method that adds counterbalance, reduce crossbeam to be the same as main shaft box self-prossessed and of generation be out of shape, if pursue medium (B) place is shown. Main shaft of be born boring machine covers the self-prossessed prolapse when the canister is extended, the self-prossessed prolapse when ram of main shaft of horizontal milling machine is extended, all can decrease with the measure that imposes counterbalance or eliminate its prolapse. CNC Milling