CN214023511U - Weight balancing device of precision machining center - Google Patents
Weight balancing device of precision machining center Download PDFInfo
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- CN214023511U CN214023511U CN202022411444.8U CN202022411444U CN214023511U CN 214023511 U CN214023511 U CN 214023511U CN 202022411444 U CN202022411444 U CN 202022411444U CN 214023511 U CN214023511 U CN 214023511U
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Abstract
The utility model discloses a precision finishing center weight balancing unit acts on vertical headstock, and it includes two balance cylinder and fuel feeding mechanism, two balance cylinder's piston rod acts on vertical headstock in step, provides an ascending pulling force for vertical headstock, fuel feeding mechanism includes motor, pump, loading valve and oil tank, the motor with the pump transmission is connected, the oil-out of pump with the P mouth fluid intercommunication of loading valve, and be provided with the check valve on the connecting pipeline, the T mouth intercommunication of loading valve to the oil tank, the main oil circuit is connected to the A mouth of loading valve, the main oil circuit with the oil inlet of two balance cylinder is connected simultaneously, has the pole chamber fuel feeding for two balance cylinder. The balancing device reduces or even counteracts the load of the spindle box by designing an upward pulling force, and designs the oil supply mechanism, the energy accumulator and the like, thereby realizing the functions of automatic detection and automatic pressure supplement of the system and leading the spindle to have no sinking.
Description
Technical Field
The invention relates to a turbine large blade type surface precision machining device, in particular to a weight balancing device of a precision machining center.
Background
When processing some steam turbine large blades, a multi-shaft numerical control processing center is used, taking an FTV850 vertical processing center as an example, the main shaft moves up and down, and the precise transmission is realized by driving a lead screw and movably screwing through a Z-axis motor arranged on a lathe bed, so that the processing of workpiece blades is completed. Because the whole weight of main shaft is very heavy, and motor, lead screw are twisted freely the load very big, and faults such as motor burnout, lead screw wearing and tearing often appear have influenced production efficiency and machining precision, and when stopping unusually in addition, Z axle motor brake can't brake immediately, the phenomenon of sinking appears, leads to the cutter to pound the work piece out the pit and lead to scrapping, and this kind of blade monolithic cost is expensive, need to avoid this kind of condition to take place, consequently needs improve equipment action accuracy urgently.
Disclosure of Invention
The invention aims to provide a weight balancing device of a precision machining center, which is used for reducing the load on a Z bearing, reducing or even eliminating the Z-axis sinking and avoiding damaging a workpiece.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a precision finishing center weight balancing unit, act on vertical headstock, it includes two balanced hydro-cylinders and oil supply mechanism, the piston rod synchronization action of two balanced hydro-cylinders is on vertical headstock, provide an ascending pulling force for vertical headstock, oil supply mechanism includes the motor, the pump, loading valve and oil tank, the motor is connected with the pump transmission, the oil-out of pump and the P mouth fluid intercommunication of loading valve, and be provided with the check valve on the connecting pipeline, the T mouth intercommunication of loading valve to the oil tank, the main oil circuit is connected to the A mouth of loading valve, the main oil circuit is connected with the oil inlet of two balanced hydro-cylinders simultaneously, for the pole chamber fuel feeding of having of two balanced hydro-cylinders.
Furthermore, the loading valve adopts a two-position four-way reversing valve, when the loading valve is switched to the first position, the port P is communicated with the port T, and the port A and the port B are closed; when the loading valve is switched to the second position, the port P is communicated with the port A, and the port B is communicated with the port T.
Furthermore, a pressure sensor is arranged on the main oil circuit and is in signal connection with a loading valve, and when the detected pressure is smaller than a set value, the loading valve is switched to a second position to convey pressure oil into the main oil circuit; when the detected pressure is not less than the set value, the loading valve is switched to the first position.
Further, still include the energy storage ware, the hydraulic fluid port and the main oil circuit fluid intercommunication of energy storage ware, and be provided with the governing valve on the connecting line, the hydraulic fluid port of energy storage ware still is connected with the pressure release pipeline, and the pressure release pipeline communicates to the oil tank.
Furthermore, a pressure sensor is arranged on the main oil circuit, the pressure sensor is in signal connection with the regulating valve, and the opening degree of the regulating valve is controlled to enable the pressure value of the main oil circuit to be maintained to a target value.
Further, a pressure relief valve is arranged on the pressure relief pipeline.
Furthermore, a stamping opening is arranged on the pressure relief pipeline.
Further, a pressure gauge is arranged on the main oil path.
Compared with the prior art, the weight balancing device of the precision machining center has the advantages that the weight balancing device of the precision machining center reduces or even offsets the load of the spindle box by designing an upward pulling force, and an oil supply mechanism, an energy accumulator and the like are designed, so that the functions of automatic detection and automatic pressure supplement of a system are realized, the device is ensured to maintain a normal working state, the spindle has no sinking amount, the precision is higher, the fault rate of a machine tool is reduced, the production efficiency is improved, and the product rejection rate is greatly reduced.
Drawings
Fig. 1 is a hydraulic schematic diagram of a weight balancing device of a precision machining center according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is clearly and completely described in the following with reference to the accompanying drawings.
Referring to fig. 1, the present embodiment provides a weight balancing device for a precision machining center, which acts on a vertical spindle box 14, and includes two balancing cylinders 1, an oil supply mechanism, and an energy accumulator 7.
The piston rods of the two balance oil cylinders 1 synchronously act on the vertical spindle box 14 to provide an upward pulling force for the vertical spindle box 14.
The oil supply mechanism comprises a motor 2, a pump 3, a loading valve 4 and an oil tank 5, the motor 2 is in transmission connection with the pump 3, an oil outlet of the pump 3 is in fluid communication with a port P of the loading valve 4, a one-way valve 13 is arranged on a connecting pipeline, a port T of the loading valve 4 is communicated to the oil tank 5, a port A of the loading valve 4 is connected with a main oil way 6, and the main oil way 6 is simultaneously connected with oil inlets of the two balance oil cylinders 1 to supply oil to rod cavities of the two balance oil cylinders 1.
The loading valve 4 is preferably a two-position four-way reversing valve, when the loading valve 4 is switched to the first position, the port P is communicated with the port T, and the port A and the port B are closed; when the charge valve 4 is switched to the second position, the port P communicates with the port a, and the port B communicates with the port T.
A pressure sensor 8 and a pressure gauge 9 are arranged on the main oil way 6, the pressure sensor 8 is in signal connection with the loading valve 4, and when the detected pressure is smaller than a set value, the loading valve 4 is switched to a second position to convey pressure oil into the main oil way 6; when the detected pressure is not less than the set value, the charge valve 4 is switched to the first position.
In the embodiment, the whole balance system balances the weight of the Z axis (main shaft) by providing pulling force by two balance cylinders 1 fixed on a cross beam of a machine body, and when the Z axis is positioned at a lower limit, the pressure provided by the system can balance the weight of the Z axis by 100%. The pressure compensation oil supply mechanism of the system realizes pressure compensation, the system pressure of the Z axis at the lower limit 100% balance Z axis is assumed to be P, no matter which position the Z axis is at in the system action process, when the pressure sensor 8 detects that the system pressure is lower than 0.7P, the motor 2 is electrified to start to operate, the loading valve 4 is electrified to charge the pressure, and when the system pressure reaches P, the loading valve 4 is deenergized, and the motor 2 is deenergized.
An oil port of the energy accumulator 7 is in fluid communication with the main oil way 6, a regulating valve 10 is arranged on the connecting pipeline, and the oil port of the energy accumulator 7 is also connected with a pressure relief pipeline which is communicated to the oil tank 5.
The pressure sensor 8 is also in signal connection with the regulator valve 10, and controls the opening degree of the regulator valve 10 so that the pressure value of the main oil passage 6 is maintained at a target value. When the accumulator 7 is not enough to provide pressure, the oil supply mechanism supplies pressure oil, and the excess pressure oil can be stored by the accumulator 7 or drained back to the oil tank 5.
And a pressure release valve 11 and a stamping opening 12 are arranged on the pressure release pipeline and used for independently charging and discharging energy for the energy accumulator 7 so as to meet the use requirement.
The following describes the design process for implementation in terms of practice.
1) Calculating the actual weight G of the Z axisZAfter a hydraulic jack with the diameter of 100mm is adopted to hold the Z shaft, the brake of the Z shaft is removed, the Z shaft is jacked upwards by the jack, the pressure shows 50bar, and G is judgedZ＝PS＝50bar×π×(5cm)2＝(50×1.02)kg/cm2×π×(5cm)2≈4000kg；
2) The maximum stroke H of the Z axis is 940mm, the total weight plus resistance is nearly 4T considering that the stroke of the Z axis is too long, and in order to prevent the piston rod from yielding after being stressed for a long time, the weight of the Z axis is balanced by adopting a mode that the piston rod of the balance cylinder is pulled upwards, the diameter of the selected piston rod is calculated to be phi 40, and r is determined to be220mm, in order to guarantee that the upper limit and the lower limit balance weight are equivalent in effect, the oil inlet and the oil discharge amount of the balance oil cylinder should be reduced as much as possible, that is to say, the smaller the piston diameter is, the better the piston diameter is, and for convenience of processing, the radius of the piston of the selected oil cylinder is r1The single balance oil cylinder pressure at the lower limit can be calculated as 25mm
Oil demand of balance cylinder with Z axis from lower limit to upper limit
3) Balance calculation at lower limit 100% on Z axisAnd checking the weight of the Z axis which can be balanced by the balance oil cylinder after the Z axis is at the upper limit. The volume V of the accumulator is selected here025L, initial pressure of nitrogen P0110bar when charged with oil pressure P1156.25bar from P0V0＝P1V1＝P2(V1+V△) Obtaining the oil demand V1＝17.6L， P2137.5 bar. Therefore, the balance is 100% at the lower limit, and the balance is 88% at the upper limit, so that the balance effect of the upper limit and the lower limit is equivalent.
The practical use proves that after the weight balancing device is additionally arranged, the current of the Z-axis motor is reduced to below 10% from the original 60-70%, the temperature of the motor is reduced to room temperature from 50-60 ℃, the fault test of equipment is artificially simulated, the Z axis does not sink any after the emergency stop button is pressed down, and the design requirement is met.
In summary, the weight balance device of the precision machining center reduces or even offsets the load of a spindle box by designing an upward pulling force, and designs an oil supply mechanism, an energy accumulator and the like, thereby realizing the functions of automatic detection and automatic pressure supplement of a system, ensuring that the device maintains a normal working state, ensuring that the spindle has no sinking amount, having higher precision, reducing the fault rate of a machine tool, improving the production efficiency and greatly reducing the rejection rate of products.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but is capable of various modifications and changes without departing from the spirit and scope of the invention, which are intended to be within the scope of the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a precision finishing center weight balancing unit, acts on vertical headstock, its characterized in that, includes two balanced hydro-cylinders and oil feed mechanism, the piston rod of two balanced hydro-cylinders acts on vertical headstock in step, provides an ascending pulling force for vertical headstock, oil feed mechanism includes motor, pump, load valve and oil tank, the motor with the pump transmission is connected, the oil-out of pump with the P mouth fluid intercommunication of load valve, and be provided with the check valve on the connecting line, the T mouth intercommunication of load valve to the oil tank, the main oil circuit is connected to the A mouth of load valve, the main oil circuit with the oil inlet of two balanced hydro-cylinders is connected simultaneously, for the pole chamber fuel feeding of two balanced hydro-cylinders.
2. The precision machining center weight balancing apparatus of claim 1, wherein: the loading valve adopts a two-position four-way reversing valve, when the loading valve is switched to a first position, a port P is communicated with a port T, and a port A and a port B are closed; when the loading valve is switched to the second position, the port P is communicated with the port A, and the port B is communicated with the port T.
3. The precision machining center weight balancing apparatus of claim 2, wherein: the main oil circuit is provided with a pressure sensor, the pressure sensor is in signal connection with the loading valve, and when the detected pressure is smaller than a set value, the loading valve is switched to a second position to convey pressure oil to the main oil circuit; when the detected pressure is not less than the set value, the loading valve is switched to the first position.
4. The precision machining center weight balancing apparatus of claim 1, wherein: the oil port of the energy accumulator is communicated with the main oil way in a fluid mode, a regulating valve is arranged on the connecting pipeline, the oil port of the energy accumulator is further connected with a pressure relief pipeline, and the pressure relief pipeline is communicated to the oil tank.
5. The precision machining center weight balancing apparatus of claim 4, wherein: and a pressure sensor is arranged on the main oil way, is in signal connection with the regulating valve and controls the opening degree of the regulating valve to maintain the pressure value of the main oil way to a target value.
6. The precision machining center weight balancing apparatus of claim 4, wherein: and a pressure relief valve is arranged on the pressure relief pipeline.
7. The precision machining center weight balancing apparatus of claim 4, wherein: and a stamping opening is formed in the pressure relief pipeline.
8. The precision machining center weight balancing apparatus of claim 1, wherein: and a pressure gauge is arranged on the main oil path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022411444.8U CN214023511U (en) | 2020-10-26 | 2020-10-26 | Weight balancing device of precision machining center |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022411444.8U CN214023511U (en) | 2020-10-26 | 2020-10-26 | Weight balancing device of precision machining center |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222430A (en) * | 2020-10-26 | 2021-01-15 | 无锡透平叶片有限公司 | Weight balancing device of precision machining center |
| CN114412956A (en) * | 2022-01-14 | 2022-04-29 | 湖南九五精机有限责任公司 | Large-scale headstock nitrogen gas-hydraulic pressure balanced system of elimination pressure fluctuation |
-
2020
- 2020-10-26 CN CN202022411444.8U patent/CN214023511U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222430A (en) * | 2020-10-26 | 2021-01-15 | 无锡透平叶片有限公司 | Weight balancing device of precision machining center |
| CN114412956A (en) * | 2022-01-14 | 2022-04-29 | 湖南九五精机有限责任公司 | Large-scale headstock nitrogen gas-hydraulic pressure balanced system of elimination pressure fluctuation |
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