A counterweight balance device for a spindle of a CNC machining center

Abstract

The invention discloses a balance weight balancing device for a numerical control machining center spindle. The balance weight balancing device comprises a stand column and a spindle module. A hydraulic oil balance tank is fixed to the machining center stand column through a tank body support. A pressure gauge and a pressure sensor are installed on the hydraulic oil balance tank of a hydraulic system. A hydraulic buffering and limiting structure is fixedly arranged on a cylinder body of a balance oil cylinder, and a screw rod driving mechanism is arranged between a spindle base and the stand column. A balance weight module comprises a top plate, a groove plate, a cover plate, a piston and a balance weight disc. Due to the fact that the proportion of the weight of the head of a machine to the weight of a balance weight is well controlled, the weight of the balance weight is reduced to one dozens of the original weight, and when hook face cutting machining is conducted through three-axis linkage, the smoothness of a tool is increased by 20% to 30% or so.

Description

technical field [0001] The invention relates to the technical field of the spindle of a CNC machining center, in particular to a counterweight balance device for a spindle of a CNC machining center. Background technique [0002] In the CNC vertical machining centers currently on the market, Z-axis counterweights are all equipped with additional assembly weights to balance the weight of the machine head, reduce the Z-axis motor load, and thereby reduce the Z-axis motor power. However, in this design method, the weight of the counterweight cannot be changed at any time with the change of the power of the spindle motor. The shaking of the counterweight when the Z-axis moves quickly will seriously affect the processing effect of the machine. The chain will elongate after a period of use. and other disadvantages. [0003] For example, Chinese patent CN 202114525 U discloses a counterweight balance device of a machining center, its main structure includes a nitrogen tank (1), a g...

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Problems solved by technology

[0004] The above-mentioned structure has realized counterweight balance to a certain extent, but the effect is still not ideal, mainly as follows: 1. Although the gas in the balance cylinder uses nitrogen to minimize its ability to be compressed, on the whole, The cylinder is still an elastic element, and there is a problem of springback, which cannot achieve high machining accuracy and gloss of the workpiece; 2. Fine-tuning cannot be achieved, especially in the micro-feed after the spindle is in place; 3. Automatic The locking performance is poor. After the main shaft is in place, due to the compression performance of the cylinder itself, it mainly relies on the cooperation between the driving screw and the column for locking. The locking point is relatively single, and there is looseness, which makes it difficult to meet the use accuracy requirements.

4. The air leakage problem is inevitable in the pneumatic system, which causes the drift phenomenon of the processing error, and causes the error inconsistency of the same batch of workpieces.

5. The self-weight of all spindle modules is loaded on the balance cylinder, and the cylinder is under a large force, which further causes air leakage and air leakage. Usually, it is necessary to replenish air into the nitrogen tank once a week, which is not maintenance-free operation.

5. During the use of nitrogen, there is a problem of leakage, which causes the pressure of the cylinder to decrease and causes the drift of the processing error

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