Self-adaptive regulation and control device and method for thermal deformation of static pressure workbench

Abstract

The invention discloses a static pressure workbench thermal deformation self-adaptive regulation and control device and method.The static pressure workbench thermal deformation self-adaptive regulation and control device comprises a static pressure workbench, a regulation and control device and a control device, the static pressure workbench comprises a guide rail and a workbench body installed on the guide rail, and an oil groove is formed in the upper side of the guide rail; the regulation and control device comprises an oil pumping assembly, a first detection piece, a second detection piece and a temperature control assembly, the oil pumping assembly and the oil groove are connected to form a circulation loop, the first detection piece is arranged on the workbench and used for detecting the deformation of the workbench, and the second detection piece and the temperature control assembly are arranged on the circulation loop and used for detecting the deformation of the workbench. The temperature sensors are respectively used for detecting the temperature of oil entering and exiting the oil tank and heating or refrigerating the oil entering the oil tank; the control device is electrically connected with the first detection piece, the second detection piece and the temperature control assembly and used for controlling the temperature control assembly to conduct refrigeration or heating according to the deformation amount and the oil liquid temperature. Thermal deformation of the workbench can be reduced as much as possible, and safe, stable, reliable and high-precision operation of equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of static pressure workbenches, and in particular to a device and method for adaptively controlling thermal deformation of a static pressure workbench. Background Art

[0002] The hydrostatic workbench has the characteristics of low friction, high rigidity, low wear, and large load-bearing capacity, and is widely used in various machining equipment, especially large and heavy precision machine tools. However, in actual operation, the hydrostatic workbench is inevitably affected by movement, friction, cutting, etc. and generates heat. Due to space limitations and installation requirements, the heat dissipation conditions are poor, inducing thermal expansion and contraction, resulting in complex deformation, which reduces machining accuracy and stability. At the same time, due to changes in complex working conditions such as external loads and cutting forces, the oil film thickness, pressure, viscosity and other characteristics of the hydrostatic workbench are difficult to maintain stability. The increase in oil film temperature seriously affects the load-bearing capacity of the motion guide rail, and local expansion, warping and other deformations occur on the lower surface of the workbench, causing machining errors.

[0003] Patent CN108274252A discloses a hydrostatic floating rotary worktable for a heavy machine tool, comprising a base and a worktable turntable located above the base, wherein the upper surface of the base is provided with a plurality of annularly evenly distributed guide rail units, each guide rail unit comprising a guide rail surface and an oil chamber arranged in the guide rail surface area; the hydrostatic floating rotary worktable also comprises a constant-flow hydrostatic hydraulic system, wherein the constant-flow hydrostatic hydraulic system comprises a pump station, an oil pool and an oil injection mechanism connecting the oil chamber and the pump station; an oil return groove is provided on the inner side of the annularly evenly distributed guide rail unit, an oil return hole is opened on the oil return groove, and the oil return hole is connected to the oil pool.

[0004] However, in the above-mentioned prior art, the static pressure workbench inevitably generates heat due to the influence of movement, friction, cutting, etc., thereby inducing thermal expansion and contraction to cause complex deformation of the static pressure workbench, resulting in reduced processing accuracy and stability. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a device and method for adaptively controlling thermal deformation of a static pressure workbench to solve the technical problem in the prior art that thermal expansion and contraction causes complex deformation of the static pressure workbench, resulting in reduced processing accuracy and stability.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a static pressure workbench thermal deformation adaptive control device, comprising: A static pressure workbench, comprising a guide rail and a workbench mounted on the guide rail, wherein an oil groove is provided on the upper side of the guide rail; a regulating device, comprising an oil pump assembly, a first detecting member, a second detecting member and a temperature control assembly, wherein the oil pump assembly is connected to the oil tank to form a circulation loop, the first detecting member is disposed on the workbench and is used to detect the deformation of the workbench, the second detecting member and the temperature control assembly are both disposed on the circulation loop, the second detecting member is used to detect the temperature of the oil entering and leaving the oil tank, and the temperature control assembly is used to heat or cool the oil entering the oil tank; and The control device is electrically connected to the first detection member, the second detection member and the temperature control component, and is used to control the cooling or heating of the temperature control component according to the deformation amount and the oil temperature.

[0007] In some embodiments, the oil grooves are provided in plurality, and the plurality of oil grooves are arranged at intervals along the circumference of the workbench, and the workbench is divided into a plurality of fan-shaped areas, and the areas correspond to the oil grooves one by one; The regulating devices are provided in plurality and correspond one to one with the oil grooves. The first detecting member is provided in the area to detect the deformation amount of the area.

[0008] In some embodiments, the first detection member includes two displacement sensors, one of which is disposed on an upper side of the region, and the other of which is disposed on an outer side of the region.

[0009] In some embodiments, the oil pump assembly includes an oil tank, an oil pump, an oil return pipe and an oil inlet pipe. The oil tank, the oil inlet pipe, the oil pump, the oil tank and the oil return pipe are connected in sequence to form the circulation loop.

[0010] In some embodiments, the second detection member includes two temperature sensors, one of which is disposed in the oil return pipeline, and the other of which is disposed in the oil inlet pipeline; and / or The temperature control component includes a heating rod and a cooler.

[0011] In some embodiments, the control device further includes a third detection member, which is disposed in the oil tank and is used to detect the oil pressure in the oil tank; The control device is electrically connected to the third detection member and the oil pump assembly to control the oil pumping amount of the oil pump assembly according to the oil pressure in the oil tank.

[0012] In addition, the present invention also provides a method for adaptively controlling thermal deformation of a static pressure workbench, which is applied to the above-mentioned adaptively controlling thermal deformation of a static pressure workbench, and comprises the following steps: Obtaining the deformation of the workbench and comparing it with a first set value; Obtain the oil temperature of the oil inlet tank and the oil temperature of the oil outlet tank; Compare the oil temperature entering the oil tank with the oil temperature leaving the oil tank; When the deformation of the workbench is greater than a first set value, and the oil temperature of the oil inlet tank is greater than the oil temperature of the oil outlet tank, the temperature control component is controlled to heat.

[0013] In some embodiments, after the step of “comparing the oil temperature of the oil inlet tank with the oil temperature of the oil outlet tank”, the method further includes: When the deformation of the workbench is greater than a first set value and the oil temperature of the oil inlet tank is lower than the oil temperature of the oil outlet tank, the temperature control component is controlled to cool.

[0014] In some embodiments, after the step of “obtaining the oil temperature of the oil inlet tank and the oil temperature of the oil outlet tank”, the method further includes: When the deformation of the workbench is less than the first set value, the oil temperature of the oil outlet tank is compared with the second set value; When the oil temperature of the oil outlet tank is greater than the second set value, the temperature control component is controlled to cool.

[0015] In some embodiments, after the step of “obtaining the deformation of the workbench and comparing it with the first set value”, the method further includes: When the deformation of the workbench is greater than the first set value, the oil pressure in the oil tank is obtained and compared with the third set value; When the oil pressure in the oil tank is greater than the third set value, the oil pump is controlled to reduce the oil pumping amount.

[0016] Compared with the prior art, the present invention provides a self-adaptive control device for thermal deformation of a static pressure workbench, wherein the oil pump assembly can transport oil to the oil tank. Since the oil tank is between the guide rail and the workbench, when the oil tank is filled with oil, an oil film is formed to lift the workbench, so that the workbench and the guide rail are not in contact with each other, and the oil in the oil tank flows back to the oil pump assembly under external pressure. The circulation of the oil can exchange heat with the workbench, and the detection component can detect the deformation of the workbench and the temperature of the oil in and out of the oil tank in real time, thereby changing the temperature of the oil entering the oil tank according to the deformation of the workbench and the temperature of the oil in and out of the oil tank, thereby changing the temperature of the workbench, thereby reducing the thermal deformation of the workbench as much as possible as a whole, and ensuring the safe, stable, reliable and high-precision operation of the equipment.

[0017] The present application can sensitively, accurately, online and in real time measure the deformation of the workbench and the temperature of the oil in and out of the oil tank. By adjusting the temperature of the oil input into the oil tank, the temperature of the workbench is changed, so that the thermal deformation of the workbench is always within an optimal target range, which greatly reduces the impact of changes in working conditions on the state of the workbench and ensures the machining accuracy of the machine tool.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a static pressure workbench thermal deformation adaptive control device provided by the present invention; Figure 2 yes Figure 1 A partial schematic diagram of the middle workbench; Figure 3 yes Figure 1 A partial schematic diagram of the middle guide rail; Figure 4 It is a flow chart of the method for adaptively controlling thermal deformation of a static pressure workbench provided by the present invention.

[0020] Description of reference numerals: 1-static pressure workbench, 11-base, 12-guide rail, 121-oil tank, 13-workbench, 131-area, 2-oil pump assembly, 21-oil tank, 22-oil pump, 23-return oil pipeline, 24-oil inlet pipeline, 25-check valve, 26-fine oil filter, 27-coarse oil filter, 3-displacement sensor, 4-pressure sensor, 5-temperature sensor, 6-heating rod, 7-cooler. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] In order to solve the technical problem in the prior art that thermal expansion and contraction causes complex deformation of the static pressure workbench, resulting in reduced processing accuracy and stability, the present invention provides a static pressure workbench thermal deformation adaptive control device, which can reduce the thermal deformation of the workbench and ensure safe, stable, reliable and high-precision operation of the equipment.

[0023] See also Figure 1 , Figure 1 It is a schematic structural diagram of a static pressure workbench thermal deformation adaptive control device in one embodiment of the present invention.

[0024] The present invention provides a self-adaptive control device for thermal deformation of a static pressure workbench, comprising a static pressure workbench 1, a control device and a control device, wherein the static pressure workbench 1 comprises a guide rail 12 and a workbench 13 installed on the guide rail 12, and an oil groove 121 is arranged on the upper side of the guide rail 12; the control device comprises an oil pumping assembly 2, a first detection component, a second detection component and a temperature control assembly, the oil pumping assembly 2 is connected with the oil groove 121 to form a circulation loop, the first detection component is arranged on the workbench 13, and is used to detect the deformation amount of the workbench 13, the second detection component and the temperature control assembly are both arranged in the circulation loop, the second detection component is used to detect the temperature of the oil entering and leaving the oil groove 121, and the temperature control assembly is used to heat or cool the oil entering the oil groove 121; and the control device is electrically connected to the first detection component, the second detection component and the temperature control assembly, and is used to control the temperature control assembly to cool or heat according to the deformation amount and the oil temperature.

[0025] In this example, see Figures 1 to 3 The oil pump assembly 2 can transport the oil to the oil tank 121. Since the oil tank 121 is between the guide rail 12 and the workbench 13, when the oil tank 121 is filled with oil, an oil film is formed to lift the workbench 13, so that the workbench 13 and the guide rail 12 are not in contact with each other, and the oil in the oil tank 121 flows back to the oil pump assembly 2 under external pressure. The circulation of the oil can exchange heat with the workbench 13, and the detection component can detect the deformation of the workbench 13 and the temperature of the oil entering and leaving the oil tank 121 in real time, thereby changing the temperature of the oil entering the oil tank 121 according to the deformation of the workbench 13 and the temperature of the oil entering and leaving the oil tank 121, thereby changing the temperature of the workbench 13, thereby reducing the thermal deformation of the workbench 13 as much as possible as a whole, and ensuring the safe, stable, reliable and high-precision operation of the equipment.

[0026] The present application can sensitively, accurately, online and real-time measure the deformation of the workbench 13 and the temperature of the oil in and out of the oil tank 121. By adjusting the temperature of the oil in the input oil tank 121, the temperature of the workbench 13 is changed, so that the thermal deformation of the workbench 13 is always within an optimal target range, which greatly reduces the impact of changes in working conditions on the state of the workbench 13 and ensures the machining accuracy of the machine tool.

[0027] In one embodiment, there are multiple oil grooves 121, and the multiple oil grooves 121 are arranged at intervals along the circumference of the workbench 13. The workbench 13 is divided into multiple fan-shaped areas 131, and the areas 131 correspond one-to-one to the oil grooves 121; there are multiple control devices, and they correspond one-to-one to the oil grooves 121, and the first detection member is arranged in the area 131 to detect the deformation amount of the area 131.

[0028] In this embodiment, the workbench 13 is disc-shaped, the guide rail 12 is ring-shaped, the static pressure workbench 1 also includes a base 11, the guide rail 12 is fixedly mounted on the base 11, the workbench 13 is rotatably mounted on the upper side of the guide rail 12, and the oil groove 121 is arranged corresponding to the bottom surface of the workbench 13. Since the workbench 13 is large in size, different areas 131 of the workbench 13 are subjected to different heat conditions during actual use, so the thermal deformation of different areas 131 is also different. In order to accurately In order to accurately control the temperature of the workbench 13, the workbench 13 can be equally divided into a plurality of areas 131, each area 131 is arranged in a fan shape, and accordingly, a plurality of oil grooves 121 can be arranged on the guide rail 12, and the plurality of oil grooves 121 correspond one-to-one to the plurality of areas 131, and each of the oil grooves 121 is equipped with the control device, and the first detection component is arranged on the area 131 corresponding to the oil groove 121 to detect the deformation of the area 131, thereby realizing the control of the divided areas 131 and improving the control accuracy.

[0029] In this embodiment, an oil pad is disposed on the upper side of the guide rail 12 . The oil pad is hollow, and the oil pad and the guide rail 12 together enclose the oil groove 121 .

[0030] Furthermore, a plurality of the oil pads are provided, and the plurality of the oil pads are arranged at intervals along the circumference of the workbench 13 , thereby forming a plurality of the oil grooves 121 .

[0031] In one embodiment, see Figures 1 to 3 The first detection member includes two displacement sensors 3 , one of which is disposed on the upper side of the region 131 , and the other of which is disposed on the outer side of the region 131 .

[0032] In this embodiment, in order to detect the deformation amount of the area 131, the first detection member is two displacement sensors 3, and the two displacement sensors 3 are respectively arranged on the upper side and the outer side of the area 131, and the control device is electrically connected to the two displacement sensors 3, and the two displacement sensors 3 can transmit the deformation amount of the upper side and the outer side of the area 131 to the control device.

[0033] In one embodiment, see Figures 1 to 3 The oil pump assembly 2 includes an oil tank 21, an oil pump 22, an oil return pipe 23 and an oil inlet pipe 24. The oil tank 21, the oil inlet pipe 24, the oil pump 22, the oil tank 121, and the oil return pipe 23 are connected in sequence to form the circulation loop.

[0034] In this embodiment, oil is stored in the oil tank 21, an oil inlet is provided at the bottom of the oil groove 121, a gap is provided between the guide rail 12 and the workbench 13, the gap is connected to the oil groove 121, the oil in the oil groove 121 overflows from the gap, both ends of the return oil pipe 23 are respectively connected to the gap and the oil tank 21, both ends of the oil inlet pipe 24 are respectively connected to the oil inlet and the oil tank 21, the oil pump 22 is provided on the oil inlet pipe 24, the oil pump 22 can pump the oil in the oil tank 21 into the oil groove 121, and the oil overflowing from the oil groove 121 returns to the oil tank 21 through the return oil pipe 23, thereby forming an oil circulation, and during the oil circulation process, the oil exchanges heat with the workbench 13, thereby achieving the purpose of lowering the temperature of the workbench 13.

[0035] Furthermore, the oil pump assembly 2 also includes a one-way valve 25, a fine oil filter 26, and a coarse oil filter 27. The coarse oil filter 27, the oil pump 22, the fine oil filter 26 and the one-way valve 25 are sequentially arranged on the oil inlet pipe 24 along the direction of the oil flow channel. The fine oil filter 26 and the coarse oil filter 27 can play a filtering role to prevent impurities from entering the oil tank 121, and the one-way valve 25 can prevent oil reflux.

[0036] It should be noted that the one-way valve 25, the fine oil filter 26 and the coarse oil filter 27 are all prior art and will not be described in detail herein.

[0037] In one embodiment, see Figures 1 to 3 The second detection component includes two temperature sensors 5 , one of which is disposed in the oil return pipe 23 , and the other of which is disposed in the oil inlet pipe 24 .

[0038] In this embodiment, the two temperature sensors 5 are respectively arranged inside the return oil pipe 23 and the oil inlet pipe 24, and the control device is electrically connected to the two temperature sensors 5. The two temperature sensors 5 can transmit the temperature of the oil entering the oil tank 121 and the temperature of the oil flowing out of the oil tank 121 to the control device.

[0039] Furthermore, the two temperature sensors 5 are located at positions of the oil return pipe 23 and the oil inlet pipe 24 close to the oil tank 121 , respectively. Such an arrangement can improve detection accuracy and avoid interference from the external environment.

[0040] In one embodiment, see Figures 1 to 3 The temperature control component includes a heating rod 6 and a cooler 7.

[0041] In this embodiment, the control device is electrically connected to the heating rod 6 and the cooler 7. The heating rod 6 is arranged at the bottom of the oil tank 21, and the cooler 7 is arranged on the side wall of the oil tank 21. The heating rod 6 can heat the oil in the oil tank 21, and the cooler 7 can cool the oil in the oil tank 21, thereby realizing heating and cooling of the oil.

[0042] Furthermore, the heating rod 6 is arranged in a zigzag manner at the bottom of the oil tank 21 , and two coolers 7 are provided, and the two coolers 7 are located on two opposite sides of the oil tank 21 .

[0043] In one embodiment, see Figures 1 to 3 The regulating device also includes a third detecting member, which is arranged in the oil groove 121 and is used to detect the oil pressure in the oil groove 121; the control device is electrically connected to the third detecting member and the oil pumping assembly 2 to control the oil pumping amount of the oil pumping assembly 2 according to the oil pressure in the oil groove 121.

[0044] In this embodiment, the oil will continue to exchange heat with the workbench 13 during its circulation process, so the flow rate of the oil will also affect the heat exchange efficiency, and the flow rate of the oil in the oil tank 121 is related to the oil pressure in the oil tank 121, so a third detection component is also provided in the oil tank 121, and the third detection component can detect the pressure of the oil in the oil tank 121, and the control device is electrically connected to the third detection component and the oil pump 22, and the control device can receive data transmitted by the third detection component and control the rotation speed of the oil pump 22, thereby changing the pumping oil amount to achieve the purpose of changing the oil flow rate, when the deformation of the workbench 13 is too large and the oil pressure in the oil tank 121 is greater than the set value, the control device can control the oil pump 22 to reduce the rotation speed, and when the deformation of the workbench 13 is too large and the oil pressure in the oil tank 121 is less than the set value, the control device can control the oil pump 22 to increase the rotation speed. By analyzing the oil pressure in the oil tank 121, the speed of the corresponding oil pump 22 is reasonably increased within a limit to increase the oil flow rate, thereby improving the heat exchange efficiency between the workbench 13 and the oil, thereby timely changing the temperature distribution of the workbench 13 to suppress thermal deformation.

[0045] In this embodiment, the third detection component is a pressure sensor 4 , and the pressure sensor 4 is disposed at the bottom of the oil tank 121 .

[0046] In this embodiment, the temperature sensor 5 , the pressure sensor 4 , and the displacement sensor 3 sense and transmit data online and in real time at a certain frequency.

[0047] In this embodiment, the control device includes an A / D analog-to-digital converter and a PLC numerical control system, the A / D analog-to-digital converter is electrically connected to the PLC numerical control system, the temperature sensor 5, the pressure sensor 4 and the displacement sensor 3 are all electrically connected to the A / D analog-to-digital converter, the A / D analog-to-digital converter can convert the analog signal of the sensor into a voltage signal and transmit it to the PLC numerical control system, the PLC numerical control system is electrically connected to the heating rod 6, the cooler 7 and the oil pump 22, and the PLC numerical control system is used to control the heating of the heating rod 6 or the cooling of the cooler 7 or the speed of the oil pump 22.

[0048] See also Figure 4 The present invention also provides a method for adaptively controlling thermal deformation of a static pressure workbench, comprising the following steps: S1, obtaining the deformation of the workbench 13 and comparing it with a first set value; In this embodiment, in step S1, the first set value is 0.005 mm, the workbench 13 is equally divided into a plurality of fan-shaped areas 131, and a displacement sensor 3 is provided on the upper side and the outer side of each area 131. The deformation of each area 131 is detected by the above-mentioned displacement sensors 3 and transmitted to the control device. The control device receives the deformation amount of the current area 131 and compares it with 0.005 mm.

[0049] S2, obtaining the oil temperature of the oil inlet tank 121 and the oil temperature of the oil outlet tank 121; In this embodiment, in step S2, temperature sensors 5 are provided in the oil inlet pipe 24 and the oil return pipe 23 corresponding to each oil tank 121. The temperature sensor 5 in the oil inlet pipe 24 is used to detect the oil temperature of the oil inlet tank 121, and the temperature sensor 5 in the oil return pipe 23 is used to detect the oil temperature of the oil outlet tank 121. The two temperature sensors 5 can thereby obtain the oil temperature of the oil inlet tank 121 and the oil temperature of the oil outlet tank 121.

[0050] S3, comparing the oil temperature of the oil inlet tank 121 with the oil temperature of the oil outlet tank 121; S4. When the deformation of the workbench 13 is greater than the first set value, and the oil temperature of the oil inlet groove 121 is greater than the oil temperature of the oil outlet groove 121, the temperature control component is controlled to heat.

[0051] In this embodiment, in step S4, when the deformation of a certain area 131 is greater than 0.005 mm, and at this time the oil temperature of the oil inlet groove 121 corresponding to the area 131 is greater than the oil temperature of the oil outlet groove 121, it means that the temperature of the area 131 is relatively low at this time, and the area 131 shrinks and deforms when it is cold, and the temperature of the area 131 needs to be increased. The control device controls the heating rod 6 in the oil tank 21 corresponding to the area 131 to work, thereby increasing the oil temperature in the oil tank 21, and then increasing the oil temperature in the oil inlet groove 121, so as to accelerate the transfer of heat from the oil to the workbench 13.

[0052] In one embodiment, after the step of “comparing the oil temperature of the oil inlet groove 121 with the oil temperature of the oil outlet groove 121 ”, the method further includes: When the deformation of the workbench 13 is greater than the first set value, and the oil temperature of the oil inlet groove 121 is lower than the oil temperature of the oil outlet groove 121 , the temperature control component is controlled to cool.

[0053] In this embodiment, when the deformation of a certain area 131 is greater than 0.005 mm, and at this time the oil temperature of the oil inlet groove 121 corresponding to the area 131 is lower than the oil temperature of the oil outlet groove 121, it means that the temperature of the area 131 is relatively high at this time, and the area 131 is preheating expansion deformation, and the temperature of the area 131 needs to be lowered. The control device controls the cooler 7 in the oil tank 21 corresponding to the area 131 to work, thereby reducing the oil temperature in the oil tank 21, and then reducing the oil temperature in the oil inlet groove 121, so as to accelerate the transfer of heat from the workbench 13 to the oil.

[0054] In one embodiment, after the step of “obtaining the oil temperature of the oil inlet tank 121 and the oil temperature of the oil outlet tank 121 ”, the method further includes: When the deformation of the workbench 13 is less than the first set value, the oil temperature of the oil outlet groove 121 is compared with the second set value; When the oil temperature of the oil outlet groove 121 is greater than the second set value, the temperature control component is controlled to cool.

[0055] In this embodiment, the second set value is 25°C, which is the average external temperature. When the deformation of a certain area 131 is less than 0.005 mm, it means that the deformation of the area 131 is small at this time, and it is only necessary to judge and compare the oil temperature of the oil groove 121 with 25°C. When the oil temperature of the oil groove 121 is greater than 25°C, it means that the oil temperature is high and needs to be cooled. The control device controls the cooler 7 in the oil tank 21 corresponding to the area 131 to work, thereby reducing the oil temperature in the oil tank 21 and ensuring the stability of the oil temperature.

[0056] Furthermore, in this embodiment, after the step of “when the deformation of the workbench 13 is less than the first set value, comparing the oil temperature of the oil outlet groove 121 with the second set value”, it also includes: When the oil temperature of the oil outlet tank 121 is lower than the second set value, the temperature control component is controlled to heat.

[0057] Specifically, when the deformation of a certain area 131 is less than 0.005 mm and the oil temperature of the oil outlet groove 121 is less than 25°C, it means that the oil temperature is low and needs to be heated. The control device controls the heating rod 6 in the oil tank 21 corresponding to the area 131 to work, thereby increasing the oil temperature in the oil tank 21 and ensuring the stability of the oil temperature.

[0058] In one embodiment, after the step of “obtaining the deformation of the workbench 13 and comparing it with the first set value”, the method further includes: When the deformation of the workbench 13 is greater than the first set value, the oil pressure in the oil tank 121 is obtained and compared with the third set value; When the oil pressure in the oil tank 121 is greater than the third set value, the oil pump 22 is controlled to reduce the oil pumping amount.

[0059] In this embodiment, the third setting value is 0.8 MPa. When the deformation of a certain area 131 is greater than 0.005 mm, and the oil pressure in the oil tank 121 corresponding to the area 131 is greater than 0.8 MPa, the control device controls the oil pump 22 corresponding to the oil tank 121 to reduce the oil pumping amount.

[0060] In one embodiment, after the step of “when the deformation of the workbench 13 is greater than the first set value, obtaining the oil pressure in the oil tank 121 and comparing it with the third set value”, the method further includes: When the oil pressure in the oil tank 121 is less than the third set value, the oil pump 22 is controlled to increase the oil pumping amount.

[0061] Specifically, when the deformation of a certain area 131 is greater than 0.005 mm, and the oil pressure in the oil groove 121 corresponding to the area 131 is less than 0.8 MPa, the control device controls the oil pump 22 corresponding to the oil groove 121 to increase the oil pumping amount.

[0062] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: During specific use, each independent oil pump 22 operates to extract oil from different oil tanks 21, and the oil enters different oil grooves 121 through the corresponding coarse oil filter 27, fine oil filter 26, one-way valve 25 and oil supply pipeline. With the continuous supply of oil, the pressure in the oil groove 121 gradually increases, forming an oil film to generate static pressure, thereby floating the workbench 13, and the workbench 13 is subjected to external loads. At the same time, the oil in each oil groove 121 and the lower surface of each area 131 undergo liquid forced convection heat exchange. Under the action of the pressure in the oil groove 121, the uneven heat of each area 131 of the workbench 13 is discharged along with the oil through the oil pad around, and returns to the respective oil tanks 21 through the corresponding oil return pipeline 23.

[0063] During the reciprocating circulation of oil, the temperature sensors 5 arranged inside each oil discharge pipe and oil supply pipe collect the temperature data of the oil in each oil tank 121 at a certain frequency, the pressure sensors 4 arranged inside each oil tank 121 collect the pressure data of the oil in each oil tank 121 at a certain frequency, and the displacement sensors 3 arranged on the upper surface and side surface of each area 131 collect the deformation data of different areas 131 of the workbench 13 at a certain frequency. The collected data information is converted into voltage signals by the A / D analog-to-digital converter and then transmitted to the PLC numerical control system online in real time.

[0064] The PLC numerical control system analyzes and processes the data information. When the deformation of a certain area 131 is greater than a given value, the temperature of the input and output oil of the corresponding oil tank 121 is compared. If the input oil temperature is lower than the output oil temperature, a command is sent to control the operation of the corresponding cooler 7; conversely, if the input oil temperature is higher than the output oil temperature, a command is sent to control the operation of the corresponding heating rod 6. The pressure of the oil in the corresponding oil tank 121 is analyzed, and a command is sent to increase the corresponding motor speed within a limit. When the deformation of a certain area 131 is less than a given value, the temperature of the output oil of the corresponding oil tank 121 is analyzed. If the input oil temperature is greater than the set value, a command is sent to control the operation of the corresponding cooler 7; conversely, if the input oil temperature is less than the set value, a command is sent to control the operation of the corresponding heating rod 6.

[0065] The data information collected by the sensor in this application is converted into a voltage signal through an A / D analog-to-digital converter and transmitted to the PLC numerical control system. The PLC numerical control system sends instructions to control the operation of the cooler 7 and the heating rod 6 to change the temperature of the oil in the oil tank 21, and adjusts the speed of the oil pump 22 to change the speed of the oil input into the oil chamber, thereby affecting the strength of the convective heat exchange between the workbench 13 and the oil, controlling the temperature distribution of the workbench 13, and adaptively adjusting the thermal deformation of the workbench 13.

[0066] The present application changes the temperature distribution of the workbench 13 by detecting data such as temperature, pressure and deformation, changing the input oil temperature and oil flow rate, thereby reducing the overall thermal deformation of the workbench 13 as much as possible and ensuring safe, stable, reliable and high-precision operation of the equipment.

[0067] The present application can sensitively, accurately, online and in real time measure the deformation of the workbench 13, the input and output oil temperatures and the pressure of the oil in the oil tank 121. By adjusting the temperature and speed of the oil input into different oil tanks 121, the temperature distribution of the workbench 13 is changed, so that the thermal deformation of the workbench 13 is always within an optimal target range, which greatly reduces the impact of changes in working conditions on the state of the workbench 13 and ensures the machining accuracy of the machine tool.

[0068] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A static pressure workbench thermal deformation adaptive control device, characterized in that: It includes: A static pressure workbench, comprising a guide rail and a workbench mounted on the guide rail, wherein an oil groove is provided on the upper side of the guide rail; a regulating device, comprising an oil pump assembly, a first detecting member, a second detecting member and a temperature control assembly, wherein the oil pump assembly is connected to the oil tank to form a circulation loop, the first detecting member is disposed on the workbench and is used to detect the deformation of the workbench, the second detecting member and the temperature control assembly are both disposed on the circulation loop, the second detecting member is used to detect the temperature of the oil entering and leaving the oil tank, and the temperature control assembly is used to heat or cool the oil entering the oil tank; and The control device is electrically connected to the first detection member, the second detection member and the temperature control component, and is used to control the cooling or heating of the temperature control component according to the deformation amount and the oil temperature.

2. The static pressure workbench thermal deformation adaptive control device according to claim 1 is characterized in that: There are a plurality of oil grooves, which are arranged at intervals along the circumference of the workbench. The workbench is divided into a plurality of fan-shaped areas, and the areas correspond to the oil grooves one by one. The regulating devices are provided in plurality and correspond one to one with the oil grooves. The first detecting member is provided in the area to detect the deformation amount of the area.

3. The static pressure workbench thermal deformation adaptive control device according to claim 2 is characterized in that: The first detection member includes two displacement sensors, one of which is arranged on the upper side of the area, and the other of which is arranged on the outer side of the area.

4. The static pressure workbench thermal deformation adaptive control device according to claim 1, characterized in that: The oil pump assembly comprises an oil tank, an oil pump, an oil return pipeline and an oil inlet pipeline. The oil tank, the oil inlet pipeline, the oil pump, the oil tank and the oil return pipeline are sequentially connected to form the circulation loop.

5. The static pressure workbench thermal deformation adaptive control device according to claim 4 is characterized in that: The second detection member comprises two temperature sensors, one of which is disposed in the oil return pipeline, and the other of which is disposed in the oil inlet pipeline; and / or The temperature control component includes a heating rod and a cooler.

6. The static pressure workbench thermal deformation adaptive control device according to claim 1 is characterized in that: The control device further comprises a third detection member, which is disposed in the oil tank and is used to detect the oil pressure in the oil tank; The control device is electrically connected to the third detection member and the oil pump assembly to control the oil pumping amount of the oil pump assembly according to the oil pressure in the oil tank.

7. A method for adaptively controlling thermal deformation of a static pressure workbench, applied to the device for adaptively controlling thermal deformation of a static pressure workbench according to any one of claims 1 to 6, characterized in that: The following steps are involved: Obtaining the deformation of the workbench and comparing it with a first set value; Obtain the oil temperature of the oil inlet tank and the oil temperature of the oil outlet tank; Compare the oil temperature entering the oil tank with the oil temperature leaving the oil tank; When the deformation of the workbench is greater than a first set value, and the oil temperature of the oil inlet tank is greater than the oil temperature of the oil outlet tank, the temperature control component is controlled to heat.

8. The method for adaptively controlling thermal deformation of a static pressure workbench according to claim 7, characterized in that: After the step of "comparing the oil temperature of the oil inlet tank with the oil temperature of the oil outlet tank", the step further includes: When the deformation of the workbench is greater than a first set value and the oil temperature of the oil inlet tank is lower than the oil temperature of the oil outlet tank, the temperature control component is controlled to cool.

9. The method for adaptively controlling thermal deformation of a static pressure workbench according to claim 7, characterized in that: After the step of "obtaining the oil temperature of the oil inlet tank and the oil temperature of the oil outlet tank", it also includes: When the deformation of the workbench is less than the first set value, the oil temperature of the oil outlet tank is compared with the second set value; When the oil temperature of the oil outlet tank is greater than the second set value, the temperature control component is controlled to cool.

10. The method for adaptively controlling thermal deformation of a static pressure workbench according to claim 7, characterized in that: After the step of "obtaining the deformation of the workbench and comparing it with the first set value", it also includes: When the deformation of the workbench is greater than the first set value, the oil pressure in the oil tank is obtained and compared with the third set value; When the oil pressure in the oil tank is greater than the third set value, the oil pump is controlled to reduce the oil pumping amount.

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