The structure of grinder lathe bed that is based on kinetic feature optimizes layout design

  • Time:
  • Click:395
  • source:FANYA CNC Machining
Of the dynamic character of structure of 1 foreword lathe bed and machine tool overall function is having affinity, the trends that raises machine tool lathe bed is characteristic, to assuring the treatment of the machine tool precision has important sense. Traditional machine tool lathe bed is designed, still be in the design phase of experience, static state, analogy, the dynamic character that considers machine tool component hard is right overall the influence of function. Software of ANSYS of article have the aid of is built inside round grinder lathe bed and those who improve plan is finite yuan of model, the defect that locates lathe bed to go up in kinetic character, undertake an analysis to the dynamic character of the model, discuss trends of implementation machine tool to optimize the way of the design. The kinetic model of structure of 2 analysises model and analytic lathe bed grow 2160mm, wide 760mm, tall 750mm. Slideway form is, , smooth slideway, interior has two transverse and perpendicular anything resembling a tendon or vein board the slideway that prop up. The wall before lathe bed leaves have large window, in-house muscle board freely alternate with, many strengthen small muscle board, bottom is close form, thick 18mm of the wall outside lathe bed, muscle board thick 14mm. Graph 1 grinder lathe bed is finite yuan of model and lathe bed of vibration shape sketch map use system unit to build a model (graph 1a) . first-order and oscillatory frequency is 289.

5Hz, measure for opposite displacement bigger turn round vibration (graph 1b) . This report gives former lathe bed to arise easily below grinding force drive to be twisted considerably brace up, make grinding surface produces Zhen Wen, bring about the fall of grinding precision. Cause fight the main reason that twists stiffness inadequacy to be lathe bed interior muscle board decorates front of unreasonable, lathe bed to leave to even if transverse bar board disconnects,make be caused by. Be aimed at afore-mentioned analysises, in dimension of exterior of consideration lathe bed changeless premise falls, to lathe bed interior muscle board structure and layout are made revise accordingly, put forward 4 to improve plan. The article will analyse lathe bed interior the influence with the characteristic to structural trends change of muscle board amount and layout, it is those who realize lathe bed to optimize a design to provide necessary basis. Because lathe bed is basic,improve a model functional requirement, its exterior dimension basically is affirmatory, muscle of ministry of place less than board layout is to adjust lathe bed is kinetic characteristic better starting point. Improve model lathe bed bottom is used blame close structure, outside mural thick 16mm, in-house muscle board thick 12mm. Have taller static stiffness to assure lathe bed slideway at the same time, improve model what lathe bed interior props up slideway is transverse and perpendicular muscle board is changeless, v, the span of smooth slideway is changeless, other the muscle of two direction board layout is shown 2 times like the graph. Graph the model after structure of 2 lathe bed improves improves A model: Lathe bed interior has 3 levels muscle board and 3 fore-and-aft and perpendicular muscle board. Improve B model: Lathe bed interior has 2 levels muscle board and 3 fore-and-aft and perpendicular muscle board. Improve C model: Lathe bed interior has 2 levels muscle board and 2 fore-and-aft and perpendicular muscle board. Improve D model: Lathe bed interior has 2 levels muscle board and 3 fore-and-aft and perpendicular muscle board (with improve B model distinction depends on a level the position of muscle board is different) . 3 dynamic analysises and result to high accuracy grinder, the dynamic character of machine tool structure is one of crucial factors that affect machine tool performance. Considering the working frequency band of the machine tool, of lathe bed before a few rank mode character has main effect. The most typical is to consider frequency of first-order mode and its corresponding vibration shape. The oscillatory character of lathe bed expresses first-order frequency quite (mode of vibration of slideway of Hz) vibration shape measures average ** former lathe bed relative to displacement 289.

5 turn round 0.

7450 improve A model 440.

6 turn round 0.

6021 improve B model 347.

6 turn round 0.

4371 improve C model 424.

0 turn round 0.

7313 improve D model 375.

0 turn round 0.

The V of machine tool lathe bed that 3671** issues for same normalization standard, smooth model slideway is measured relative to oscillatory displacement finite to lathe bed yuan the model undertakes mode is analysed, the result is shown like subordinate list place. Can see from inside the watch, improve model first-order the natural frequency that turns round vibration shape all has than former lathe bed very big rise, it is natural frequency according to the W1 in W1=(k1/m1)½(type, the mode stiffness that K1, M1 is correspondence respectively and quality) knowable, improve model of lathe bed fight twisted stiffness to have rise significantly, achieved one of goals that improve a design to lathe bed. Visible, muscle board can raise the level of lathe bed apparently of lathe bed fight twist stiffness. Improve A interior to have 3 levels muscle board and fore-and-aft and perpendicular muscle board, improve C interior to have two levels muscle board and fore-and-aft and perpendicular muscle board, its move stiffness very tall, but photograph of slideway vibration mode is very old however to displacement quantity. Improve D model move stiffness to be less than improve C model, but photograph of slideway vibration mode is small to displacement quantity. This specification with board the dynamic character of the lathe bed that cake compose gives priority to suffers each board piece the combined influence of vibration shape, cannot regard assess as index by the measurement that uses stiffness only. Improve D model quite at improving C model, much more fore-and-aft and perpendicular muscle board, but make fight instead twist stiffness to drop. Improve B model and improve D model only muscle of a level board the position is different, cause its trends character to have bigger difference however. This shows, increase what muscle board can not raise lathe bed certainly one-sidedly to move stiffness, it is the result that collaboration of total construction put together uses. Because lathe bed slideway is oscillatory,the volume that mode measures relative to displacement is the main factor that affects grinder to machine precision, the size that wants to be measured relative to displacement with the oscillatory mode of lathe bed slideway so is the main basis that designs reference, at the same time machine tool of give attention to two or morethings uses the characteristic index such as stiffness and vibration shape. Mix through afore-mentioned analysises quite, improve D model slideway vibration mode is measured relative to displacement the smallest, and slideway moves stiffness taller. So, classics is integrated after comparing, should choose improve program of D this one design. CNC Milling CNC Machining