Precision machine tool with hydrostatic bearings

Abstract

This invention discloses a precision hydrostatic press, comprising a machine body, a machining spindle, a first drive structure, a first hydrostatic slide block assembly, and an oil supply structure. The machining spindle is slidably mounted on a support frame along a first direction. The first drive structure drives the machining spindle to move along the first direction. The first hydrostatic slide block assembly includes a first guide rail and a first slide block. The first guide rail is mounted on the support frame, and the first slide block is mounted on the machining spindle. The first guide rail extends along the first direction. The first slide block has a first oil inlet and multiple first oil spray ports. The first slide block has multiple first contact surfaces that contact the first guide rail, and each first contact surface has at least one oil spray port. An oil storage tank is connected to the first oil inlet via a pipe to drive oil to be sprayed from the multiple first oil spray ports to form an oil film between the first slide block and the first guide rail. The precision hydrostatic press of this invention can improve machining accuracy.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a precision machining hydrostatic press. Background Technology

[0002] In the fields of precision machining and ultra-precision machining, the guiding accuracy, stiffness, and damping characteristics of machine tool moving parts directly affect the machining accuracy and surface quality of the parts. Traditional rolling or sliding guides, due to direct mechanical contact, inevitably produce friction, wear, and creep phenomena, making it difficult to meet the machining accuracy requirements at the sub-micron or even nanometer level. Summary of the Invention

[0003] The main objective of this invention is to propose a precision hydrostatic press to improve the machining accuracy of parts.

[0004] To achieve the above objectives, the present invention proposes a precision machining hydrostatic press, comprising: The machine tool body includes a base and a support frame erected on the base; a processing table is provided on the base. The machining spindle is slidably mounted on the support frame along the first direction; A first drive structure is mounted on the support frame and drivenly connected to the machining spindle. The first drive structure is used to drive the machining spindle to move along the first direction. The first hydrostatic slider assembly includes a first guide rail and a first slider that slides with the first guide rail. One of the first guide rail and the first slider is mounted on the support frame, and the other is mounted on the machining spindle. The first guide rail extends along the first direction. The first slider is provided with a first oil inlet and a plurality of first oil injection ports. The first oil inlet and the plurality of first oil injection ports are all in communication. The first slider has a plurality of first contact surfaces that contact the first guide rail. Each first contact surface is provided with at least one of the oil injection ports. And, the oil supply structure includes an oil storage tank, which is connected to the first oil inlet via a pipe, for driving oil to be sprayed out from a plurality of the first oil spray nozzles to form an oil film between the first slider and the first guide rail.

[0005] Optionally, the first guide rail is provided with a first slide groove, the first slide groove extends along the first direction, and the first slider is slidably installed in the first slide groove.

[0006] Optionally, the bottom wall of the first chute is provided with a first oil drain port, which is located at the lower edge of the bottom wall of the first chute in the vertical direction, and the first oil drain port is connected to the oil storage tank through a pipe.

[0007] Optionally, the machining spindle includes a machining shaft, a mounting base, and a first sliding base. The machining shaft is mounted on the first sliding base, and the mounting base is slidably mounted on the support frame along the first direction and connected to one of the first guide rail and the first slider. The precision hydrostatic press further includes a second hydrostatic slide block assembly and a second drive structure. The second hydrostatic slide block assembly includes a second guide rail and a second slide block that slides with the second guide rail. One of the second guide rail and the second slide block is located on a mounting base, and the other is located on the first sliding base. The second guide rail extends along a second direction, which is perpendicular to the first direction. The second slide block is provided with a second oil inlet and a plurality of second oil spray ports. The second oil inlet is connected to the oil storage tank through a pipe. The second oil inlet is also connected to the plurality of second oil spray ports. The second slide block has a plurality of second contact surfaces that contact the second guide rail. Each second contact surface is provided with at least one second oil spray port. The second oil inlet is connected to the oil storage tank through a pipe. The second drive structure is mounted on the mounting base and drivenly connected to the first sliding base, for driving the first sliding base to slide along the second direction, so as to drive the machining axis to rise and fall relative to the base.

[0008] Optionally, the precision machining hydrostatic press further includes an oil receiving tray, which is disposed on the support frame and located below the first hydrostatic slider assembly and the second hydrostatic slider assembly. The oil receiving tray extends along the first direction, and the orthographic projection of the first hydrostatic slider assembly and the second hydrostatic slider assembly in the vertical direction is located within the oil receiving tray.

[0009] Optionally, the surface of the support frame is provided with a second oil drain port, which is connected to the oil storage tank. The oil receiving tray is provided corresponding to the second oil drain port, and the oil received by the oil receiving tray is discharged through the second oil drain port.

[0010] Optionally, the bottom wall of the oil receiving tray has a first side and a second side, the second side being disposed adjacent to the second oil outlet, and the first side of the bottom wall gradually extending downward in the direction pointing to the second side.

[0011] Optionally, the precision machining hydrostatic press further includes a second sliding seat, a third driving structure, and a third hydrostatic slider assembly. The machining table is mounted on the second sliding seat, the second sliding seat is slidably mounted on the base along a third direction, the third driving structure is mounted on the base and drivenly connected to the second sliding seat, and the first direction, the second direction, and the third direction are perpendicular to each other. The third hydrostatic slider assembly includes a third guide rail and a third slider that slides with the third guide rail. One of the third guide rail and the third slider is mounted on the base, and the other is mounted on the second sliding seat. The third guide rail extends along the third direction. The third slider is provided with a third oil inlet and multiple third oil injection ports. The third oil inlet is connected to the oil storage tank through a pipe. The third oil inlet is connected to multiple third oil injection ports. The third slider has multiple third contact surfaces that contact the third guide rail. Each third contact surface has at least one third oil injection port.

[0012] Optionally, the third guide rail is provided with a third sliding groove, the third sliding groove extends along the third direction, the third sliding groove has an upper sidewall, a lower sidewall and a bottom wall located between the upper sidewall and the lower sidewall that are opposite each other in the vertical direction, and the third slider is slidably installed between the upper sidewall, the lower sidewall and the bottom wall.

[0013] Optionally, the lower sidewall is provided with an oil collection trough, which is located on the side of the lower sidewall away from the bottom wall and extends along the third direction. The bottom wall of the oil collection trough is provided with a third oil outlet, which is connected to the oil storage tank through a pipe.

[0014] The technical solution of this invention involves slidingly mounting a machining spindle along a first direction onto a support frame of the machine tool body, mounting a first drive structure on the support frame and drivingly connecting it to the machining spindle to drive the machining spindle to move along the first direction; the first hydrostatic slider assembly includes a first guide rail and a first slider that slides with the first guide rail, one of which is mounted on the support frame and the other on the machining spindle. The first guide rail extends along the first direction, and the first slider has a first oil inlet and multiple first oil spray ports, all of which are connected. The first slider has multiple first contact surfaces that contact the first guide rail, and each first contact surface has at least one oil spray port; the oil supply structure includes an oil reservoir, which is connected to the first oil inlet through a pipe to drive oil to be sprayed from the multiple first oil spray ports to form an oil film between the first slider and the first guide rail. In this way, high-pressure oil is delivered into the gap between the first slider and the first guide rail through the oil supply structure to form a complete oil film, allowing the two to move relative to each other under full liquid suspension. This completely eliminates solid friction between metals and the crawling phenomenon that easily occurs at low speeds, ensuring that the machining spindle can perform micron and submicron level feeds at extremely uniform speeds. This directly improves the surface finish and contour accuracy of the workpiece. In addition, the non-contact motion eliminates wear on the first guide rail and the first slider, ensuring that the guiding accuracy of the machine tool will not decrease due to wear during long-term use, thus guaranteeing the long-term stability of workpiece machining accuracy. Moreover, the high damping properties of the oil film quickly absorb vibrations during machining, avoiding chatter and ensuring dimensional accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the precision machining hydrostatic press of the present invention; Figure 2 for Figure 1 A cross-sectional view of a medium-precision hydrostatic press. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 1 Another sectional view of a medium-precision hydrostatic press; Figure 5 for Figure 1 A partial structural diagram of a medium-precision hydrostatic press. Figure 6 for Figure 1 A partial structural diagram of a medium-precision hydrostatic press. Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 for Figure 1 A partial structural diagram of a medium-precision hydrostatic press. Figure 9 for Figure 8 Enlarged view of point C in the middle; Figure 10 for Figure 1 A partial structural diagram of a medium-precision hydrostatic press. Figure 11 for Figure 10 Enlarged view of point D in the middle; Figure 12 This is a schematic diagram of the first slider.

[0017] Explanation of icon numbers: 10. Machine tool body; 11. Base; 12. Support frame; 121. Second oil drain port; 13. Machining table; 20. Machining spindle; 21. Machining axis; 22. Mounting seat; 23. First sliding seat; 30. First hydrostatic slider assembly; 31. First guide rail; 311. First slide groove; 312. First oil drain port; 32. First slider; 321. First oil inlet; 322. First oil spray port; 40. Second hydrostatic slider assembly; 4 1. Second guide rail; 411. Second slide groove; 42. Second slider; 51. Oil receiving tray; 52. Second sliding seat; 53. Third drive structure; 60. Third hydrostatic slider assembly; 61. Third guide rail; 611. Third slide groove; 612. Oil collection groove; 613. Third oil outlet; 62. Third slider; 70. Automatic tool changer structure; 71. Tool magazine; 72. Tool changing robot; 81. First oil supply pipe; 82. Second oil supply pipe.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] This invention proposes a precision machining hydrostatic press.

[0023] In embodiments of the present invention, such as Figures 1 to 12 As shown, the precision machining hydrostatic press includes a machine tool body 10, a machining spindle 20, a first drive structure, a first hydrostatic slide block assembly 30, and an oil supply structure.

[0024] Specifically, the machine tool body 10 includes a base 11 and a support frame 12 erected on the base 11; a machining table 13 is provided on the base 11. The base 11 is integrally cast from a high-strength, high-rigidity material (such as cast iron or mineral castings) and undergoes aging treatment to eliminate internal stress. Its function is to provide a stable and robust foundation for the entire machine tool and absorb vibrations generated during machining.

[0025] The support frame 12 is erected (i.e., set vertically) on the base 11, and is usually designed as a gantry structure or a column structure. The processing table 13 is fixedly or movably set on the base 11. The processing table 13 serves as a platform for positioning and clamping workpieces directly or through fixtures (such as electromagnetic chucks, vises, etc.).

[0026] The machining spindle 20 is a component with a rotary spindle and a drive motor, which is slidably mounted on the support frame 12 along a first direction. In this design, the first direction can be a vertical direction (Z-axis direction) or a horizontal direction (X-axis or Y-axis direction), depending on the machine tool configuration. In a vertical machining scenario, this direction is preferably the vertical feed direction. The vertical direction is the sliding guide direction of the spindle and also the main motion direction for achieving the depth of cut. The sliding mounting method allows the machining spindle 20 to perform low-resistance, high-precision reciprocating linear motion along the support frame 12 under the drive of the first drive structure.

[0027] The first drive structure is mounted on the support frame 12 and is driven to connect with the machining spindle 20, and is used to drive the machining spindle 20 to move along the first direction.

[0028] The first drive structure can be a combination of a servo motor and a ball screw, a linear motor, a hydraulic cylinder, or a pneumatic cylinder, among other power devices. Its fixed end is integrated into the support frame 12, and its output end is connected to the machining spindle 20 or a slide fixed to the spindle. During operation, the control system issues a command, and the first drive structure outputs precise displacement or force to overcome the load and minor resistance, driving the machining spindle 20 to move along the first direction at a predetermined speed and position, completing the feed action.

[0029] Specifically, the first hydrostatic slider assembly 30 includes a first guide rail 31 and a first slider 32 that slides with the first guide rail 31. One of the first guide rail 31 and the first slider 32 is mounted on the support frame 12, and the other is mounted on the machining spindle 20. The first guide rail 31 extends along a first direction. The first slider 32 is provided with a first oil inlet 321 and a plurality of first oil injection ports 322. The first oil inlet 321 is connected to the plurality of first oil injection ports 322. The first slider 32 has a plurality of first contact surfaces that contact the first guide rail 31, and each first contact surface is provided with at least one oil injection port.

[0030] The first hydrostatic slider assembly 30 is a key device for achieving high-precision, frictionless or extremely low-friction guidance. It includes a first guide rail 31 and a first slider 32 that slides in cooperation with the first guide rail 31.

[0031] Of the first guide rail 31 and the first slider 32, one is mounted on the support frame 12, and the other is mounted on the machining spindle 20. This creates two optional configurations: when the first guide rail 31 is fixed to the support frame 12, the first slider 32 is fixed to a moving part connected to the machining spindle 20; conversely, if the first slider 32 is fixed to the support frame 12, the first guide rail 31 moves together with the machining spindle 20. Both methods can achieve the guiding function, and the choice can be made according to the specific layout of the machine tool.

[0032] The first guide rail 31 has a sliding surface with high flatness and straightness. The first guide rail 31 extends along the first direction and its length covers at least the entire stroke required by the machining spindle 20, providing a continuous guide reference for the linear motion of the first slider 32 and the machining spindle 20.

[0033] The first slider 32 is provided with a first oil inlet 321 and multiple first oil injection ports 322. The first oil inlet 321 is used to connect to a pressurized oil source. All the first oil injection ports 322 are connected to the first oil inlet 321 through flow channels machined inside the first slider 32, forming a branched oil circuit network. The branched oil circuit network can ensure that the pressurized oil entering from the first oil inlet 321 can be distributed to each first oil injection port 322 with equal flow resistance and equal pressure drop. The first oil inlet 321 may be provided with a threaded interface or a quick-connect coupling.

[0034] The first slider 32 has multiple first contact surfaces that contact the first guide rail 31. Each first contact surface refers to the surface of the first slider 32 that directly faces the first guide rail 31 and is used to form a bearing oil film. Each first contact surface has at least one first oil injection port 322. That is, the first slider 32 does not only fit against the first guide rail 31 on one side, but is arranged facing the corresponding guide surface of the first guide rail 31 through at least two, usually three or four, spatially angled contact surfaces. For example, when a rectangular first guide rail 31 is used, the first slider 32 may have an upper first contact surface, a lower first contact surface, and two lateral first contact surfaces. One or more oil injection ports are provided on each first contact surface, thereby forming a pressure oil film in each gap between the first guide rail 31 and the first slider 32. In this way, regardless of whether the machining spindle 20 is subjected to positive pressure, lateral force, or overturning moment, the oil film on each contact surface can generate a reverse bearing force, ensuring that the first slider 32 is always in a fully liquid suspended state relative to the first guide rail 31. This avoids direct metal-to-metal contact, fundamentally eliminating sliding friction and wear, and achieving extremely high motion accuracy and damping characteristics. Optionally, the first hydrostatic slider assembly 30 includes two first sliders 32 that slide in cooperation with the first guide rail 31 to form a stable bearing span.

[0035] Specifically, the oil supply structure includes an oil storage tank, which is connected to the first oil inlet 321 via a pipe. The oil supply structure is used to drive oil to be sprayed out from multiple first oil spray nozzles 322 to form an oil film between the first slider 32 and the first guide rail 31.

[0036] The oil supply structure is used to provide stable and clean pressure oil to the first hydrostatic slider assembly 30. It includes at least an oil storage tank, which serves as a storage container for the oil and is connected to the first oil inlet 321 through a pipeline.

[0037] In this embodiment, the oil supply structure also includes components such as a hydraulic pump, an overflow valve, a fine filter, and a pressure gauge (not all are shown in the figure). The hydraulic pump draws oil from the oil storage tank and pressurizes it, then delivers it through a pipeline to the first oil inlet 321, thereby forcing the oil to be sprayed out at high speed from multiple first oil spray ports 322.

[0038] After the oil is injected into the tiny gap between the first slider 32 and the first guide rail 31, it forms a pressure oil film with load-bearing capacity. By adjusting the oil supply pressure, the thickness and stiffness of the oil film can be controlled to adapt to different loads and machining accuracy requirements. This oil supply structure drives the oil to be sprayed out from multiple first oil injection ports 322, ensuring that a complete lubricating oil film is always maintained between the first slider 32 and the first guide rail 31, so that the sliding pair operates under pure liquid friction.

[0039] This oil supply structure delivers high-pressure oil into the gap between the first slider 32 and the first guide rail 31, forming a complete oil film that allows them to move relative to each other under full liquid suspension. This completely eliminates solid friction between metals and the creeping phenomenon that easily occurs at low speeds, ensuring that the machining spindle 20 can perform micron and submicron level feeds at extremely uniform speeds. This directly improves the surface finish and contour accuracy of the workpiece. The non-contact motion eliminates wear on the first guide rail 31 and the first slider 32, ensuring that the guiding accuracy of the machine tool will not decrease due to wear during long-term use, thus guaranteeing the long-term stability of workpiece machining accuracy. Moreover, the high damping properties of the oil film quickly absorb vibrations during machining, avoiding chatter and ensuring dimensional accuracy.

[0040] In some embodiments, the precision hydrostatic press includes two first hydrostatic slide block assemblies 30, which are spaced apart from each other, and a first drive structure is disposed between the two first hydrostatic slide block assemblies 30. This allows the two first hydrostatic slide block assemblies 30 to bear both guiding and load support, which helps improve movement stability.

[0041] In some embodiments, the first guide rail 31 is provided with a first slide groove 311, the first slide groove 311 extends along a first direction, and the first slider 32 is slidably installed in the first slide groove 311.

[0042] Specifically, a first groove 311 is provided on the first guide rail 31, and the first groove 311 extends through the first direction; the first slider 32 is slidably installed inside the first groove 311.

[0043] The cross-sectional shape of the first guide rail 31 can be designed as a rectangular groove, trapezoidal groove, or groove with a dovetail shape according to the load-bearing requirements. Its inner wall is composed of multiple guide surfaces that are spatially angled to each other, such as a main bottom surface and two opposing side surfaces. The outer contour of the first slider 32 is adapted to the inner contour of the first slide groove 311, and its multiple first contact surfaces are respectively in clearance fit with each inner wall surface of the first slide groove 311. In this way, when the first slider 32 moves in the first slide groove 311, it is geometrically constrained by at least three spaces of the first slide groove 311, realizing a fully enclosed or semi-enclosed high-rigidity guide, completely eliminating the possibility of the first slider 32 detaching from the first guide rail 31.

[0044] Furthermore, the first slider 32 has multiple first oil injection ports 322 respectively opened on each first contact surface corresponding to each inner wall surface of the first slide groove 311. After the high-pressure oil is distributed to each first oil injection port 322 through the first oil inlet 321, it is directly sprayed into the tiny gaps between each contact surface of the first slider 32 and each inner wall surface of the first slide groove 311, thereby forming independent bearing oil films at the top, bottom and sides of the first slider 32 simultaneously. This makes the first slider 32 completely covered by the pressure oil film and suspended in the center of the first slide groove 311. No matter whether the machining spindle 20 is subjected to positive pressure, lateral thrust or overturning moment, it can be directly balanced by the corresponding direction of oil film pressure increment, exhibiting extremely high isotropic stiffness and strong anti-overturning capability.

[0045] Furthermore, since the first slider 32 is constrained to slide within the first groove 311, whose surface has been precision ground or scraped, each guide surface of the first groove 311 can be clamped and machined in one go, making it very easy to ensure the perpendicularity, parallelism, and other dimensional and positional tolerances between the guide surfaces, thus providing a high-precision motion reference for the first slider 32. At the same time, the oil film enclosed on all sides forms a compression film damping effect, which can quickly absorb the micro-vibrations generated during the machining process, further improving the smoothness of the cutting process and the surface quality of the workpiece.

[0046] In some embodiments, the bottom wall of the first chute 311 is provided with a first oil outlet 312, which is located at the lower edge of the bottom wall of the first chute 311 in the vertical direction, and the first oil outlet 312 is connected to the oil storage tank through a pipe.

[0047] Specifically, the vertical direction refers to the direction of gravity acting on the machine tool during operation. The first oil outlet 312 is specifically located at the lower edge of the bottom wall, meaning it is situated at the lowest point of the first slide groove 311 cavity. This design ensures that the pressurized oil ejected from each of the first oil nozzles 322, after fulfilling its load-bearing and lubrication tasks, will naturally converge towards the lowest point of the first slide groove 311 under gravity and be smoothly and thoroughly discharged through the first oil outlet 312 located there. This fundamentally prevents oil accumulation and blockage within the first slide groove 311, avoiding temperature rise and power loss caused by oil agitation, and ensuring that the first slider 32 always moves within a fresh oil film of a specific viscosity.

[0048] Furthermore, the first oil drain port 312 is located at the lower edge of the bottom wall, rather than in the center of the bearing surface, primarily because the gap between the first slider 32 and the bottom wall of the first groove 311 is the main bearing oil film area, and its pressure distribution plays a decisive role in bearing capacity. If the first oil drain port 312 were located at the center of the bearing surface, the continuity of the oil film would be disrupted, leading to a sudden drop in pressure and loss of bearing capacity. By placing the first oil drain port 312 at the lower edge outside the geometric boundary, it provides a low-resistance outflow channel at the end of the bearing area, where the oil film is about to naturally leak out. This achieves orderly and efficient oil recovery without affecting the integrity of the pressure field in the main bearing area, balancing bearing stiffness and smooth oil drainage.

[0049] Optionally, a first screen is provided at the first oil outlet 312. The first screen is used to filter impurities in the oil to ensure the purity of the oil.

[0050] Furthermore, the bottom wall of the first chute 311 is provided with multiple first oil discharge ports 312. These ports are all located at the lower vertical edge of the bottom wall of the first chute 311 and are spaced apart along the first direction. Each first oil discharge port 312 is connected to an oil storage tank via a pipe. This simultaneous oil discharge through multiple first oil discharge ports 312 improves efficiency and ensures timely oil discharge.

[0051] In some embodiments, the machining spindle 20 includes a machining shaft 21, a mounting base 22, and a first sliding base 23. The machining shaft 21 is mounted on the first sliding base 23, and the mounting base 22 is slidably mounted on the support frame 12 along a first direction and connected to one of the first guide rail 31 and the first slider 32.

[0052] Specifically, the machining axis 21 is an end effector that performs cutting or engraving actions. Its front end can be used to clamp a tool, and it integrates an electric spindle unit or air bearing to drive its rotation. The machining axis 21 is fixedly mounted on the first sliding seat 23 and moves together with the first sliding seat 23.

[0053] The first sliding seat 23 serves as the direct carrier of the machining axis 21. Its function is to slide precisely relative to the mounting seat 22 along the second direction to realize the lifting or other lateral feed of the machining axis 21.

[0054] Mounting base 22 is a transitional connector that is slidably mounted on support frame 12 along the first direction and fixedly connected to one of the first guide rail 31 and the first slider 32. This means that mounting base 22 itself does not directly generate movement in the second direction, but rather carries the entire assembly including the first slider 23 and machining shaft 21, completing a long-stroke basic movement in the first direction along the first guide rail 31.

[0055] One of the second guide rail 41 and the second slider 42 is disposed on the mounting base 22, and the other is disposed on the first sliding base 23. That is, when the second guide rail 41 is fixed on the mounting base 22, the second slider 42 is fixed on the first sliding base 23, and vice versa. The second guide rail 41 extends along a second direction, which is perpendicular to the first direction. In a typical embodiment, if the first direction is a longitudinal (Y-axis) or transverse (X-axis) movement in the horizontal plane, then the second direction is a vertical direction (Z-axis); conversely, if the first direction is a vertical direction, then the second direction is a horizontal direction. This orthogonal configuration directly determines that the machining axis 21 can achieve lifting and lowering movement relative to the base 11 (i.e., adjusting the distance between the tool and the workpiece in the vertical direction).

[0056] The precision hydrostatic press also includes a second hydrostatic slide block assembly 40 and a second drive structure. The second hydrostatic slide block assembly 40 includes a second guide rail 41 and a second slide block 42 that slides with the second guide rail 41. One of the second guide rail 41 and the second slide block 42 is located on the mounting base 22, and the other is located on the first sliding base 23. The second guide rail 41 extends along a second direction, which is perpendicular to the first direction. The second slide block 42 is provided with a second oil inlet and a plurality of second oil spray ports. The second oil inlet is connected to an oil storage tank through a pipe. The second oil inlet is connected to the plurality of second oil spray ports. The second slide block 42 has a plurality of second contact surfaces that contact the second guide rail 41. Each second contact surface is provided with at least one second oil spray port. The second oil inlet is connected to the oil storage tank through a pipe.

[0057] Specifically, the second slider 42 is provided with a second oil inlet and multiple second oil injection ports. The second oil inlet is also connected to an oil storage tank via a pipe to obtain a constant pressure oil source. All the second oil injection ports are connected to the second oil inlet through flow channels machined inside the second slider 42, forming a branched oil circuit network. This branched oil circuit network ensures that the pressurized oil entering from the second oil inlet can be distributed to each second oil injection port with equal flow resistance and pressure drop. The second oil inlet can be equipped with a threaded interface or a quick-connect fitting. The oil is injected into the various mating gaps between the second slider 42 and the second guide rail 41 through the second oil injection ports, forming a fully suspended multi-faceted load-bearing hydrostatic oil film, ensuring that the first sliding seat 23 also has frictionless, high-rigidity, and high-damping guiding performance when moving along the second direction.

[0058] Furthermore, the second drive structure is mounted on the mounting base 22 and drivenly connected to the first sliding base 23, for driving the first sliding base 23 to slide in the second direction, so as to drive the machining axis 21 to rise and fall relative to the base 11.

[0059] Specifically, the second drive structure is mounted on the mounting base 22 and is drivenly connected to the first sliding seat 23. This second drive structure drives the first sliding seat 23 to slide along a second direction, thereby causing the machining axis 21 to move up and down relative to the base 11. The second drive structure can be of the same type as the first drive structure, such as a miniature ball screw directly connected to a servo motor, a linear voice coil motor, or a micro-feed hydraulic cylinder. Its housing or stator is fixed to the mounting base 22, while the mover or nut is connected to the first sliding seat 23.

[0060] In one embodiment, the precision hydrostatic machine tool includes two second hydrostatic slide block assemblies 40, which are spaced apart from each other, and a second drive structure is disposed between the two second hydrostatic slide block assemblies 40. This allows the two second hydrostatic slide block assemblies 40 to bear both guiding and load support, thus improving movement stability.

[0061] In some embodiments, the second guide rail 41 is provided with a second slide groove 411, the second slide groove 411 extends along a second direction, and the second slider 42 is slidably installed in the second slide groove 411.

[0062] Specifically, the cross-sectional shape of the second groove 411 can be designed as a rectangular groove, trapezoidal groove, or dovetail groove, etc., according to the bearing characteristics in the second direction. The inner wall of the second groove 411 is composed of multiple guide surfaces that are at angles to each other in space. For example, it may include a bottom wall, two side walls, and in a closed structure, a top wall, forming a three- or four-sided enclosed cavity. The outer contour of the second slider 42 is adapted to the inner contour of the second groove 411, and is embedded and constrained in the second groove 411, maintaining a small hydrostatic oil film gap with each of its inner wall surfaces. This built-in enveloping structure ensures that the second slider 42 is geometrically constrained in multiple directions by the inner wall of the groove when it moves within the groove, fundamentally eliminating the possibility of the second slider 42 detaching from the guide rail due to changes in the direction of force.

[0063] Multiple second oil injection ports are respectively opened on the second contact surfaces corresponding to the inner wall surfaces of the second slide groove 411. After the high-pressure oil is distributed to each of the second oil injection ports through the second oil inlet, it is simultaneously injected into the gaps between each contact surface of the second slider 42 and each inner wall surface of the second slide groove 411, forming an independent bearing oil film around the second slider 42. In this way, the second slider 42 is completely covered by the pressure oil film and suspended in the center of the second slide groove 411. Regardless of the self-weight, cutting resistance, or dynamic inertial force borne by the machining shaft 21, it can be directly balanced by the corresponding direction of oil film pressure increment, exhibiting extremely high isotropic stiffness and excellent anti-overturning ability.

[0064] In some embodiments, the precision machining hydrostatic press further includes an oil receiving tray 51, which is disposed on the support frame 12 and located below the first hydrostatic slider assembly 30 and the second hydrostatic slider assembly 40. The oil receiving tray 51 extends along a first direction, and the orthographic projection of the first hydrostatic slider assembly 30 and the second hydrostatic slider assembly 40 in the vertical direction is located within the oil receiving tray 51.

[0065] Specifically, the oil receiving tray 51 is mounted on the support frame 12 and located below the first hydrostatic slider assembly 30 and the second hydrostatic slider assembly 40. "Below" means that, in the direction of gravity, the oil receiving tray 51 is positioned lower than the first hydrostatic slider assembly 30 and the second hydrostatic slider assembly 40. Since the first hydrostatic slider assembly 30 is responsible for guiding the movement of the mounting base 22 relative to the support frame 12, and the second hydrostatic slider assembly 40 is responsible for guiding the movement of the first sliding seat 23 relative to the mounting base 22, the two are arranged in a stacked series in space. The oil receiving tray 51, mounted on the support frame 12, spans the area below these two guide rail pairs, forming a comprehensive oil collection and receiving surface. In this way, whether the oil seeps from the end of the first groove 311, the interface gap of the first oil outlet 312, or drips from the movement gap between the second guide rail 41 and the second slider 42, it can be intercepted by the oil receiving tray 51 below, preventing the oil from dripping directly onto the processing table 13, the workpiece, the chip collection area, or the ground.

[0066] The oil receiving tray 51 extends along the first direction, meaning that its receiving range covers the entire movement trajectory of the mounting base 22 in the first direction. No matter where the mounting base 22, the second hydrostatic slider assembly 40 attached to it, and the machining spindle 20 move within the first stroke range, there is always a receiving area of ​​the oil receiving tray 51 below them, achieving continuous oil collection throughout the entire stroke without any dead zones.

[0067] In addition, in other embodiments, the precision machining hydrostatic press does not have an oil receiving tray 51.

[0068] In some embodiments, the surface of the support frame 12 is provided with a second oil outlet 121, which is connected to the oil storage tank. An oil receiving tray 51 is provided corresponding to the second oil outlet 121, and the oil received by the oil receiving tray 51 is discharged through the second oil outlet 121.

[0069] Specifically, the second oil drain port 121 is directly opened on the surface of the support frame 12, rather than being an independent pipe leading out from the oil receiving pan 51 itself. This design utilizes the rigidity of the support frame 12 as a fixed structure, integrating the oil return channel into the fixed support component of the machine tool, avoiding vibration, fatigue, or interference problems that might arise from setting up complex pipelines on the movable or semi-enclosed oil receiving pan 51. The second oil drain port 121 is connected to the oil storage tank, forming a reliable low-pressure gravity oil return path. Since the support frame 12 itself is fixed in position, this pipeline connection is also easy to arrange and maintain, and is less prone to relative displacement or leakage with moving parts.

[0070] The oil receiving tray 51 is set corresponding to the second oil outlet 121. The oil receiving tray 51 receives the oil that seeps out, splashes or drips from the gaps of the first hydrostatic slider assembly 30 and the second hydrostatic slider assembly 40, and collects it into the second oil outlet 121 on the support frame 12. Then, it flows back to the oil storage tank through independent or shared pipelines. This prevents the dripping oil from dripping onto the processing table 13, the workpiece and the optical measurement system directly below. It also prevents the oil from dripping onto the moving joint surface of the support frame 12 or other electrical components, thus improving the long-term working reliability of the machine tool.

[0071] Optionally, a second screen is provided at the second oil outlet 121. The second screen is used to filter impurities in the oil to ensure the purity of the oil.

[0072] Furthermore, the surface of the support frame 12 is provided with a plurality of second oil drain ports 121, which are spaced apart along the first direction, and each second oil drain port 121 is connected to the oil storage tank. In this way, the oil dripping into the oil receiving tray 51 can be discharged from the nearest second oil drain port 121, thereby improving the oil discharge efficiency.

[0073] In some embodiments, the bottom wall of the oil receiving tray 51 has a first side and a second side, the second side being disposed adjacent to the second oil outlet 121, and the first side of the bottom wall gradually extending downward in the direction pointing to the second side.

[0074] Specifically, the second side is positioned higher than the first side to form an inclined bottom wall. This inclined bottom wall acts as a guide, directing the oil dripping into the oil receiving pan 51 towards the second oil outlet 121, thereby improving the oil discharge efficiency. Simultaneously, it prevents oil from accumulating in the oil receiving pan 51.

[0075] In some embodiments, the precision machining hydrostatic press further includes a second sliding seat 52, a third drive structure 53 and a third hydrostatic slider assembly 60. The machining table 13 is mounted on the second sliding seat 52. The second sliding seat 52 is slidably mounted on the base 11 along a third direction. The third drive structure 53 is mounted on the base 11 and drivenly connected to the second sliding seat 52. The first direction, the second direction and the third direction are perpendicular to each other.

[0076] Specifically, the second sliding seat 52 serves as the direct motion platform for the workpiece carrier. The processing table 13 is fixedly installed on the second sliding seat 52. The second sliding seat 52 is slidably installed on the base 11 in a third direction. When it moves under the driving action, it can drive the processing table 13 and the workpiece fixed on it to achieve a third-direction position adjustment relative to the tool.

[0077] The third drive structure 53 is fixedly mounted on the base 11, and its output end is driven by the second sliding seat 52. Similar to the first and second drive structures, the third drive structure 53 can be in the form of a ball screw driven by a servo motor, a linear motor, etc., to precisely drive the second sliding seat 52 and the workpiece to move in a third direction according to CNC instructions.

[0078] The first, second, and third directions are defined as being mutually perpendicular, meaning that the motion axes of this machine tool are configured in a standard three-dimensional Cartesian coordinate system (X, Y, Z orthogonal coordinate system). In one embodiment, it can be configured as follows: The first direction is the horizontal longitudinal direction (such as the Y-axis), which is responsible for the long-stroke feed of the mounting base 22 and the machining spindle 20; The second direction is the vertical direction (such as the Z-axis), which is responsible for the lifting and lowering movement of the machining axis 21 relative to the mounting base 22; The third direction is the horizontal direction (such as the X-axis), which is responsible for the horizontal movement of the second sliding seat 52 and the machining table 13.

[0079] The three components are orthogonal to each other, enabling precise relative positioning and contour tracking between the tool and the workpiece at any position in three-dimensional space, thus enabling the machining of complex three-dimensional shapes such as free-form surfaces, aspherical surfaces, and microstructure arrays.

[0080] Furthermore, the third hydrostatic slider assembly 60 includes a third guide rail 61 and a third slider 62 that slides with the third guide rail 61. One of the third guide rail 61 and the third slider 62 is mounted on the base 11, and the other is mounted on the second sliding seat 52. The third guide rail 61 extends in a third direction. The third slider 62 is provided with a third oil inlet and multiple third oil injection ports. The third oil inlet is connected to an oil storage tank through a pipe, and the third oil inlet is connected to multiple third oil injection ports. The third slider 62 has multiple third contact surfaces that contact the third guide rail 61, and each third contact surface has at least one third oil injection port.

[0081] Specifically, of the third guide rail 61 and the third slider 62, one is mounted on the base 11, and the other is mounted on the second sliding seat 52. Typically, since the base 11 is fixed, the third guide rail 61 is fixed to the upper surface or side of the base 11, arranged along the third direction, while the third slider 62 is mounted on the bottom surface or side of the second sliding seat 52 and slides along the guide rail. This configuration ensures that the entire workpiece bearing unit is suspended by a hydrostatic oil film during movement, corresponding symmetrically to the biaxial hydrostatic pressure at the tool tip. The third guide rail 61 extends along the third direction, and its effective stroke covers the full range of displacement required for workpiece machining.

[0082] The third slider 62 is equipped with a third oil inlet and multiple third oil spray ports. The third oil inlet is also connected to the oil storage tank of the oil supply structure through a pipe to obtain a pressure oil source that has been precisely filtered and temperature-controlled. All the third oil spray ports are connected to the third oil inlet through flow channels machined inside the third slider 62, forming a branch oil circuit network. The branch oil circuit network can ensure that the pressure oil entering from the third oil inlet can be distributed to each third oil spray port with equal flow resistance and pressure drop. The third oil inlet can be equipped with a threaded interface or a quick-connect coupling. The third slider 62 has multiple third contact surfaces that contact the third guide rail 61, and each third contact surface has at least one third oil spray port. After the high-pressure oil is sprayed out from the third oil spray port, a bearing oil film is formed in each fitting gap between the third slider 62 and the third guide rail 61. This ensures that the second sliding seat 52 and the machining table 13 can be completely isolated and evenly supported by the oil film regardless of whether they are subjected to multi-directional cutting forces or the weight of the workpiece, achieving precision guidance without solid contact, friction, or wear.

[0083] In this way, the mounting base 22 moves along the first direction via the first hydrostatic slider assembly 30, and the first sliding base 23 and machining shaft 21 move along the second direction via the second hydrostatic slider assembly 40, so that the tool can obtain high-precision two-dimensional feed in the vertical plane. Meanwhile, the second sliding base 52 and machining table 13 move along the third direction via the third hydrostatic slider assembly 60, so that the workpiece can obtain high-precision independent feed in the horizontal plane.

[0084] All three axes employ fully hydrostatic guidance, fundamentally eliminating the inherent frictional resistance, backlash, creeping, and wear problems of traditional ball bearing and sliding guides. The three axes are completely decoupled spatially, each independently controlled yet coordinated by a CNC system, achieving sub-micron to nanometer-level contour machining accuracy and extremely low surface roughness. Furthermore, since the first hydrostatic slider assembly 30, the second hydrostatic slider assembly 40, and the third hydrostatic slider assembly 60 are all centrally supplied with oil by the same oil supply structure, their oil film stiffness and damping characteristics are highly consistent, resulting in unified optimization of the system's thermal stability and dynamic characteristics.

[0085] In one embodiment, the precision hydrostatic machine tool includes two third hydrostatic slide block assemblies 60, which are spaced apart from each other, and a third drive structure 53 is disposed between the two third hydrostatic slide block assemblies 60. This allows the two third hydrostatic slide block assemblies 60 to bear both guiding and load support, which helps improve movement stability.

[0086] In some embodiments, the third guide rail 61 is provided with a third slide groove 611, which extends along a third direction. The third slide groove 611 has an upper sidewall, a lower sidewall, and a bottom wall located between the upper sidewall and the lower sidewall, which are opposite each other in the vertical direction. The third slider 62 is slidably installed between the upper sidewall, the lower sidewall, and the bottom wall.

[0087] Specifically, the third slide 611 has an upper sidewall, a lower sidewall, and a bottom wall, whose relative positions in the vertical direction are clearly defined: the upper sidewall is located at a higher position, the lower sidewall at a lower position, and the bottom wall is a vertical wall connecting the upper and lower sidewalls. This means that the cross-section of the third slide 611 is a laterally open groove shape. The outer contour of the third slider 62 is adapted to the inner cavity of this groove shape and is constrained to slide within the space enclosed by the upper and lower sidewalls and the bottom wall. This three-sided enclosed structure provides geometric constraints in at least three spatial directions.

[0088] The upper and lower sidewalls form a pair of opposing bearing surfaces in the vertical direction, respectively bearing the downward gravity load and the upward overturning force, thus providing the second sliding seat 52 with bidirectional high rigidity support in the vertical direction. The bottom wall provides a lateral bearing surface in the horizontal direction, bearing the horizontal cutting force generated during processing and preventing the second sliding seat 52 from lateral displacement or torsion.

[0089] The third slider 62 is installed between the three walls mentioned above, and multiple third oil injection ports on it are respectively opened on the third contact surfaces corresponding to the upper sidewall, lower sidewall, and bottom wall of the third slide groove 611. Pressurized oil from the oil reservoir is distributed to each of the third oil injection ports through the third oil inlet, and simultaneously sprayed into the tiny gaps between the upper surface and the upper sidewall of the third slider 62, between the lower surface and the lower sidewall of the third slider 62, and between the sidewall and the bottom wall of the third slider 62, forming three independent load-bearing oil films. In this way, the third slider 62 is completely covered by the oil film and suspended in the center of the cavity of the third slide groove 611. Whether the machining table 13 is subjected to gravity, upward cutting resistance, or lateral pushing, it can be directly balanced by the pressure increment of the corresponding oil film. The oil films in each direction work independently yet cooperate with each other, giving the workpiece end motion platform extremely high vertical load-bearing stiffness and resistance to lateral sway.

[0090] Since the third slider 62 is enveloped between the upper sidewall, lower sidewall, and bottom wall of the third slide groove 611, the three guide surfaces of the upper sidewall, lower sidewall, and bottom wall can be precisely machined in one clamping, which makes it very easy to ensure the form and position tolerances such as parallelism and perpendicularity between the three, providing a high-precision spatial linear motion reference for the third slider 62, ensuring that no additional errors such as pitching, yaw, or rolling will occur when the workpiece moves along the third direction.

[0091] The upper sidewall of the third slide groove 611 naturally forms a shielding barrier, preventing chips, dust, and cutting fluid from splashing from the upper machining area into the guide pair, thus protecting the hydrostatic oil film from contamination. Simultaneously, the oil sprayed from each nozzle of the third slider 62, after completing its load-bearing process, is confined within the semi-enclosed cavity formed by the upper, lower, and bottom walls of the third slide groove 611. This facilitates orderly oil collection in the oil collection trough 612 located at the end of the third slide groove 611 or below the bottom wall, reducing oil diffusion to the outside of the base 11.

[0092] In some embodiments, the lower sidewall is provided with an oil collection groove 612, which is located on the side of the lower sidewall away from the bottom wall and extends in a third direction.

[0093] Specifically, the oil collecting groove 612 is located on the lower sidewall, specifically on the side of the lower sidewall furthest from the bottom wall. In the cross-sectional configuration of the third slide groove 611, the bottom wall is a vertical wall connecting the upper and lower sidewalls, while the lower sidewall is a horizontal bearing surface at a lower position. The side of the lower sidewall furthest from the bottom wall is the overhanging end or the edge of the opening side of the lower sidewall. This is the terminal point where the oil in the third slide groove 611 naturally flows under gravity—the pressurized oil ejected from the gaps between the third slider 62 and the upper, lower, and bottom walls. After completing its bearing and lubrication tasks, it will sink downwards under gravity and flow along the surface of the lower sidewall towards the opening side furthest from the bottom wall. Placing the oil collecting groove 612 here is precisely at the end of the natural flow of the oil, allowing it to collect all the downward-flowing oil, achieving efficient and unpowered natural collection.

[0094] The oil collection groove 612 extends along the third direction, that is, its length direction is consistent with the extension direction of the third guide rail 61, covering the entire movement stroke of the third slider 62 in the third direction. No matter where the third slider 62 and the second sliding seat 52 move, the return oil flowing out from each contact surface of the slider will fall into the continuous oil collection groove 612 along the stroke, and there will be no blind spot or leakage caused by the change of slider position.

[0095] Furthermore, the bottom wall of the oil collection tank 612 is provided with a third oil outlet 613, which is connected to the oil storage tank through a pipe.

[0096] Specifically, the bottom wall of the oil collecting tank 612 is provided with a third oil drain port 613, which is connected to the oil storage tank via a pipe. The oil collected in the oil collecting tank 612 gathers at the bottom of the tank under gravity, flows through the third oil drain port 613 into the return oil pipe, and finally returns to the oil storage tank, forming a complete closed-loop circuit of "oil storage tank, oil supply pump, third oil inlet, third oil spray nozzle, oil film gap, oil collecting tank 612, third oil drain port 613, and oil storage tank". This direct pipe connection method of oil drainage avoids oil accumulation in the oil collecting tank 612 and can promptly guide away the heat-carrying return oil, which is beneficial for controlling the temperature rise of the third guide rail 61 and the base 11, and maintaining the thermal stability of machining accuracy.

[0097] Thus, the first oil outlet 312 located at the lower edge of the bottom wall of the first slide groove 311 is responsible for collecting the internal return oil of the first hydrostatic slider assembly 30; the second oil outlet 121 located on the surface of the support frame 12 is connected to the oil receiving plate 51 and is responsible for collecting the external leakage oil of the two-stage superimposed hydrostatic assembly; the third oil outlet 613 located in the oil collection groove 612 at the lower side wall edge of the third slide groove 611 is responsible for collecting the internal return oil of the third hydrostatic slider assembly 60.

[0098] The three paths are independent yet connected to the oil storage tank, together forming a graded, classified, and fully enclosed oil circulation network to ensure that the three-axis hydrostatic press does not produce any oil leakage during long-term operation.

[0099] Optionally, a third screen is provided at the third oil outlet 613. The third screen is used to filter impurities in the oil to ensure the purity of the oil.

[0100] In some embodiments, the oil storage tanks connected to the first oil outlet 312, the second oil outlet 121, and the third oil outlet 613 are the same. This eliminates the need for an additional oil storage structure to hold the oil, thus simplifying the structure.

[0101] Furthermore, the support frame 12 is equipped with a first oil supply pipe 81, which connects to the oil storage tank, multiple first oil outlets 312 and second oil outlets 121. The base 11 is equipped with a second oil supply pipe 82, which connects to the third oil outlet 613 and the oil storage tank. By integrating the pipes into the support frame 12 and the base 11 respectively, the number of oil supply pipes can be reduced, and the structural compactness of the machine can be improved.

[0102] In some embodiments, the precision machining hydrostatic press further includes an automatic tool changer 70, which includes a tool magazine 71 and a tool changing robot 72. The tool magazine 71 is mounted on the support frame 12 and contains a plurality of different machining tools. The tool changing robot 72 is mounted on the tool magazine 71 and is configured to change the tools on the tool magazine 71 and the tools on the machining axis 21.

[0103] Specifically, the tool magazine 71 is mounted on the support frame 12 and is located in the same structural unit as the mounting base 22 and the machining spindle 20 that move along the first direction. This shortens the movement path of the robot during tool changing and can effectively reduce tool changing auxiliary time.

[0104] The tool magazine 71 contains several distinct machining tools. It's worth noting that "distinct" refers to differences in the specifications, type, size, or function of the tools. Examples include end mills of different diameters, turning tools with different radii of radius, grinding wheels of different grit sizes, drills, boring tools, reamers, and specialized forming tools, covering various process requirements such as roughing, semi-finishing, finishing, and ultra-finishing. The tools are stored in the tool magazine 71 according to a preset tool position numbering rule and are managed uniformly by the CNC system.

[0105] The tool changing robot 72 is mounted on the tool magazine 71, forming an integral module with it. The tool changing robot 72 is configured to perform the following core tasks: changing the tools on the tool magazine 71 and the tools on the machining axis 21. Its tool changing procedure typically includes: Tool retrieval: The robotic arm retrieves the tool to be used from the designated tool position in the tool magazine 71; Tool removal: The robotic arm moves to machining axis 21 and removes the current tool from machining axis 21; Tool loading: The robot arm loads the tool to be used into the tool interface (such as taper hole, chuck, etc.) of the machining axis 21; Tool return: The robotic arm puts the removed tool back into the tool magazine 71 in its original tool position or a designated empty position.

[0106] The automatic tool changer 70 enables fully automated machining of precision hydrostatic presses. Its beneficial effects are: First, the process switching efficiency is extremely high. The time required for traditional manual tool changing and resetting is reduced from tens of minutes to a few seconds, significantly shortening the non-cutting auxiliary time.

[0107] Secondly, it avoids installation errors and safety hazards introduced by manual operation. The repeatability of tool changing positioning accuracy is guaranteed by the robot and tool holder interface, ensuring the coaxiality of the tool with the spindle rotation center after each clamping, which is crucial for precision grinding and precision measurement.

[0108] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A precision machine tool with hydrostatic bearings, characterized in that include: The machine tool body includes a base and a support frame erected on the base; a processing table is provided on the base. The machining spindle is slidably mounted on the support frame along the first direction; A first drive structure is mounted on the support frame and drivenly connected to the machining spindle. The first drive structure is used to drive the machining spindle to move along the first direction. The first hydrostatic slider assembly includes a first guide rail and a first slider that slides with the first guide rail. One of the first guide rail and the first slider is mounted on the support frame, and the other is mounted on the machining spindle. The first guide rail extends along the first direction. The first slider is provided with a first oil inlet and a plurality of first oil injection ports. The first oil inlet and the plurality of first oil injection ports are all in communication. The first slider has a plurality of first contact surfaces that contact the first guide rail. Each first contact surface is provided with at least one of the oil injection ports. And, the oil supply structure includes an oil storage tank, which is connected to the first oil inlet via a pipe, for driving oil to be sprayed out from a plurality of the first oil spray nozzles to form an oil film between the first slider and the first guide rail.

2. The precision machine tool according to claim 1, wherein The first guide rail is provided with a first slide groove, the first slide groove extends along the first direction, and the first slider is slidably installed in the first slide groove.

3. The precision machine tool according to claim 2, wherein The bottom wall of the first chute is provided with a first oil drain port, which is located at the lower edge of the bottom wall of the first chute in the vertical direction. The first oil drain port is connected to the oil storage tank through a pipe.

4. The precision machine tool as claimed in claim 1, wherein, The machining spindle includes a machining shaft, a mounting base, and a first sliding base. The machining shaft is mounted on the first sliding base, and the mounting base is slidably mounted on the support frame along the first direction and connected to one of the first guide rail and the first slider. The precision hydrostatic press further includes a second hydrostatic slide block assembly and a second drive structure. The second hydrostatic slide block assembly includes a second guide rail and a second slide block that slides with the second guide rail. One of the second guide rail and the second slide block is located on a mounting base, and the other is located on the first sliding base. The second guide rail extends along a second direction, which is perpendicular to the first direction. The second slide block is provided with a second oil inlet and a plurality of second oil spray ports. The second oil inlet is connected to the oil storage tank through a pipe. The second oil inlet is also connected to the plurality of second oil spray ports. The second slide block has a plurality of second contact surfaces that contact the second guide rail. Each second contact surface is provided with at least one second oil spray port. The second oil inlet is connected to the oil storage tank through a pipe. The second drive structure is mounted on the mounting base and drivenly connected to the first sliding base, for driving the first sliding base to slide along the second direction, so as to drive the machining axis to rise and fall relative to the base.

5. The precision machine tool according to claim 4, wherein The precision machining hydrostatic press also includes an oil receiving tray, which is disposed on the support frame and located below the first hydrostatic slider assembly and the second hydrostatic slider assembly. The oil receiving tray extends along the first direction, and the orthographic projection of the first hydrostatic slider assembly and the second hydrostatic slider assembly in the vertical direction is located within the oil receiving tray.

6. The precision machine tool as claimed in claim 5, wherein, The surface of the support frame is provided with a second oil drain port, which is connected to the oil storage tank. The oil receiving tray is provided corresponding to the second oil drain port, and the oil received by the oil receiving tray is discharged through the second oil drain port.

7. The precision machine tool according to claim 6, wherein The bottom wall of the oil receiving tray has a first side and a second side, the second side being disposed adjacent to the second oil outlet, and the first side of the bottom wall gradually extending downward in the direction pointing to the second side.

8. The precision machining hydrostatic press as described in claim 4, characterized in that, The precision machining hydrostatic press further includes a second sliding seat, a third driving structure, and a third hydrostatic slider assembly. The machining table is mounted on the second sliding seat, which is slidably mounted on the base along a third direction. The third driving structure is mounted on the base and drivenly connected to the second sliding seat. The first direction, the second direction, and the third direction are perpendicular to each other. The third hydrostatic slider assembly includes a third guide rail and a third slider that slides with the third guide rail. One of the third guide rail and the third slider is mounted on the base, and the other is mounted on the second sliding seat. The third guide rail extends along the third direction. The third slider is provided with a third oil inlet and multiple third oil injection ports. The third oil inlet is connected to the oil storage tank through a pipe. The third oil inlet is connected to multiple third oil injection ports. The third slider has multiple third contact surfaces that contact the third guide rail. Each third contact surface has at least one third oil injection port.

9. The precision machining hydrostatic press as described in claim 8, characterized in that, The third guide rail is provided with a third sliding groove, which extends along the third direction. The third sliding groove has an upper sidewall, a lower sidewall, and a bottom wall located between the upper sidewall and the lower sidewall, which are opposite each other in the vertical direction. The third slider is slidably installed between the upper sidewall, the lower sidewall, and the bottom wall.

10. The precision machining hydrostatic press as described in claim 9, characterized in that, The lower sidewall is provided with an oil collection trough, which is located on the side of the lower sidewall away from the bottom wall and extends in the third direction. The bottom wall of the oil collection trough is provided with a third oil outlet, which is connected to the oil storage tank through a pipe.

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