The free air that raises large planar part to machine precision makes the same score a law

Mechanical compressor is the dominant product of my company, compressor is main what the treatment precision of old plane of bedplate of a crossbeam, slide block, job is deciding compressor directly is overall precision. Law of paper of the mat after my company used semifinishing machining all the time in the past machines old plane. It is namely when work location, in face of each fixed position (finish machining) below fill up paper, till each locate the paper below the face is smoked with the hand,do not move till, undertake its clamp machining next. Because the influence of machine tool precision and workpiece remove the refreshment of the stretch deflection after clamp condition, each precision in accomplishing treatment very hard achieves qualification. Hold paper of clip, mat for many times as a result of need again, make quality and plan are couldn't get assure. 1996 my company trial-produce compressor of one class precision, with its the precision of appearance public errand of crossbeam slide block, bolster plate reachs the requirement of precision of dimension public errand to all rise greatly, so original treatment method can suit far from. To solve this one problem, we drew lessons from advanced treatment experience of abroad, use free air to make the same score a law to solve the treatment problem of big planar high accuracy. Machine crossbeam with B2031 double housing planer, its are main dimension and precision see figure, specific treatment process is as follows: Eliminate error of precision of machine tool geometry to eliminate error of precision of geometry of direction of machine tool X to detect above all the precision of existing equipment, locate optimal work area. Get on dial gauge outfit in the vertical tool carrier of planer beam, check the moving precision of the parallelism of planer beam and workbench and workbench, record workbench nods numerical value each and good number is made on workbench, choose optimal work area according to recording data. Eliminate machine tool Z to be machined to basis of geometrical precision error height, planer beam height rises to working status, one lengthen is installed to express lever by this height on tool carrier (usable and simple stuff) express in officer of optimal work area, written record this area pulls watch data. Build fixed position face to be with the apogee in the job fiducial, in place wait to fill up iron high while, each nod the value of padding feet inside certain work area, pay the foot of a place of strategic importance of corresponding numerical value wait for tall mat below iron, draw a list again next, right now data must not is more than 0.

04mm, otherwise readjust. Decide stretch deflection, eliminate workpiece flexibility to be out of shape machine a relation because of the structure, some place tigidity are better, some place tigidity are a few poorer, below identical clamping force clamp position flexibility is out of shape differ and existing to affect to precision, should master in treatment and eliminate it. Crossbeam dimension sketch map sets work wait to fill up iron high in 4 when had drawn good list, 4 wait to fill up iron high to become workpiece to install 4 fulcrum of clip, prepare the article such as pressing plate. The method that uses the pine after be being pressed first in each fulcrum increases load beforehand, such not only can eliminate the gap between interface, and from at the beginning bigger actual interface is accumulated, actual contact area increases, make microcosmic surface each flexibility of local district is out of shape reduce, raise osculatory stiffness effectively thereby. Measure the stretch deflection that goes out each a little bit with this kind of method, adjust and compensate flexibility to be out of shape, the flexibility that serves as unified numerical value to determine each a little bit by the smallest stretch deflection next is out of shape value. The clamp that control a list has machining ground the stretch deflection of each fulcrum, press the smallest deflection (0.

06mm) serves as unified numerical value, undertake pressing expressing clamp to each fulcrum, the deflection of each fulcrum all is unified numerical value, can undertake machining after equipment be in order. My factory moved Pingfajia to be versed in 10 sheet use beam of compressor of double dot 2500kN with freedom 1996, machine qualification entirely. My factory moves freedom calm way to apply in other equipment and working procedure, also obtained favorable result. The flatness of 10 spare partses assures to be in 0.

04 ～ 0.

06mm, the parallelism that has 6 parts is in 0.

06mm is the following, achieve requirement of one class precision. Carry out a proof, free air calm way is simple easy travel and have promotion value. What require tool very simple also, need feet of the tall mat iron such as 4 above, a place of strategic importance, dial gauge only can. This method can undertake compensating to error of machine tool precision, it is spare parts of high accuracy of treatment make repairs and supply replacements, assure the effective method of quality. CNC Milling