The hydraulic pressure of milling machine of boring of numerical control be born reachs compensation evenly
Bell of gold of seedling of king Wei fourth summit

To manufacturer of machine tool production, the weight that how balances perpendicular motion part is an issue that wants serious consideration all the time. The method that balances normally basically has 3 kinds: The first be when the weight when perpendicular motion component is lighter, can use add thick drive guide screw directly, increase the method of electric machinery torque. But will make so the weight that transmission guide screw is assuming athletic part from beginning to end, bring about bosseyed wear away aggravating, the maintenance that affects machine tool precision quality; The 2nd kind is to use counterbalance weight, but the quality that this will add athletic part, make inertia increases, affect fast sex of the system; The 3rd kind is law of hydraulic pressure balance. It can avoid in front the problem that place of two kinds of methods appears.

1-2. servo a powerful person 3. 4-5 of electromagnetism reversal valve. Fluid accuses 6-7 of one-way a powerful person. Oil cylinder
Box of 8. main shaft 9. Before wire rope 10. Hind wire rope
Graph 1

My company and French FOREST -- milling machine of boring of be born of the GIMAX200 that LINE company designs production jointly numerical control, its the motion of each axes all is used static press slideway, main shaft box drives fluctuation to move through ball guide screw, ram moves inside main shaft box, boring lever moves inside ram. To the design of the machine tool, we balance a law to balance the weight of main shaft box with hydraulic pressure, as a result of,still be opposite at the same time ram shift and assemble and unassemble the change of centre of gravity of main shaft box that accessory place causes undertakes compensating. Its principle is shown 1 times like the graph.

In the graph 1 in, oil cylinder 6 connect with a travelling block, two wire rope 9, 10 bypass after travelling block, pass a pair of crown block and main shaft case respectively again 8 connection. Among them, before wire rope 9 direct solid go up on main shaft box, hind wire rope 10 pass oil cylinder 7 with connection of main shaft box. Two servo a powerful person 1, 2 charge one-way a powerful person via fluid respectively 4, 5 with oil cylinder 6, 7 UniCom. 3 for electromagnetism reversal valve, can control fluid to accuse one-way a powerful person to be opened reversely, make oil cylinder answers oil. Among them, the journey of 6 gives priority to oil cylinder the half of next athletic travels on axle box, double the pressure on its piston is weight of main shaft box. In this balance system, the weight of main shaft box is by around two wire rope 9, 10 assume jointly.

We can reach the gravity of main shaft box roughly the pulling force of around wire rope to regard a counterbalance is (will static press slideway and force of attrition of ball guide screw to ignor) . When the cutting tool that carries an installation when ram or accessory are changed, or when ram is mobile inside main shaft box, the centre of gravity of main shaft box will produce change, original counterbalance department will be destroyed. To form new counterbalance department, need the tensile reapportion to two wire rope. This " the task " basically be by the graph 1 medium two servoes a powerful person is finished. Below introduce a powerful person or family of these two servo simply.
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