Static pressure smooth pillow of gantry machining center

Abstract

The utility model relates to a gantry machining center static pressure round ram, which belongs to the technical field of machining and comprises a sliding seat, a round hole is arranged in the sliding seat, and a round ram is arranged in the round hole in a sliding mode. Hydrostatic guideway plates are uniformly distributed in the circumferential direction of the inner wall of the circular hole; a main transmission shaft is arranged at the axis of the round pillow, and one end of the main transmission shaft is connected with a main shaft unit. The spindle unit is arranged at the axis of the round ram, and meanwhile the round ram is matched with the hydrostatic guideway plates evenly distributed in the round hole, so that rigidity in all directions is consistent, deformation in all directions is consistent under the same load condition, and the machining precision of a machine tool is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining, and particularly relates to a hydrostatic round ram of a gantry machining center. Background Art

[0002] With the rapid increase in the domestic demand for large equipment such as heavy machinery, construction machinery, locomotives and rolling stock, large motors, hydraulic turbines, steam turbines, ships, and nuclear power, the machining of large box-shaped parts has become a key issue that urgently needs to be solved in China. CNC machine tools are constantly developing towards high precision and high speed, putting forward new requirements for the stiffness and quality of the moving parts of the machine tool.

[0003] A gantry boring and milling machine is a machining equipment integrating advanced technologies such as machinery, electricity, and hydraulics. It is suitable for semi-finishing and finishing in industries such as aviation, heavy machinery, locomotives, shipbuilding, power generation, machine tools, automobiles, printing, and molds, and can also be used for rough machining. The overall structure of the gantry boring and milling machine consists of a gantry frame. The gantry frame is composed of double columns, a movable crossbeam, a connecting beam, a transverse slide plate, and a milling head ram to form a rigid frame. The crossbeam moves up and down along the column guide rails (W axis). A vertical high-power multi-functional ram-type boring and milling head is configured on the crossbeam. The slide plate of the boring and milling head moves left and right (Y axis) and up and down (Z axis) along the crossbeam guide rails, and the gantry frame moves longitudinally along the bed (X axis).

[0004] Most of the current large gantry boring and milling machines adopt a square ram structure. The guide rail structures include trapezoidal guide rails and four-sided surrounding structures. The disadvantage of the trapezoidal guide rail is that the spindle center is not at the center of the guide rail. Although the spindle center of the four-sided surrounding structure is at the center of the guide rail, the stiffness of the square ram in each direction is different. During cutting, under the same load, the deformation in each direction is different, thus affecting the machining accuracy of the machine tool. Moreover, it is difficult to machine the perpendicularity of the adjacent guide rail surfaces and the parallelism of the opposite surfaces of the square ram, and it is difficult to guarantee the accuracy. In addition, the four-sided surrounding structure of the square ram also makes it difficult to guarantee the installation accuracy. Content of the Utility Model

[0005] In order to solve the problem that the force deformation in each direction of a non-circular ram affects the machining accuracy during cutting, the utility model provides a hydrostatic round ram of a gantry machining center.

[0006] The utility model is realized through the following technical solutions:

[0007] A hydrostatic round ram of a gantry machining center includes a slide base. A round hole is provided in the slide base, and a round ram is slidably arranged in the round hole. Hydrostatic guide plates are evenly distributed in the circumferential direction of the inner wall of the round hole. A main transmission shaft is provided at the axis center of the round ram, and one end of the main transmission shaft is connected with a spindle unit.

[0008] The main shaft unit is arranged at the axis of the smooth pillow. At the same time, the smooth pillow cooperates with the hydrostatic guide plates evenly distributed in the round hole, so that the stiffness in all directions is the same. Thus, under the same load conditions, the deformations in all directions are the same, which further helps to improve the machining accuracy of the machine tool.

[0009] A further improvement of the present utility model is that the surface of the hydrostatic guide plate close to the smooth pillow is an arc surface that can be adapted to the surface of the smooth pillow, which helps to improve the adaptability between the hydrostatic guide plate and the smooth pillow.

[0010] A further improvement of the present utility model is that an oil passage is provided in the hydrostatic guide plate, and a number of oil holes communicating with the oil passage are opened on the arc surface of the hydrostatic guide plate; a hydrostatic oil film is provided between the hydrostatic guide plate and the smooth pillow. The lubricating oil is discharged through the oil passage and the oil holes, so as to form a hydrostatic oil film between the hydrostatic guide plate and the smooth pillow, and improve the guiding performance of the smooth pillow.

[0011] A further improvement of the present utility model is that a guiding key extending along the axial direction of the round hole is provided in the slide base, and a key groove that can cooperate with the guiding key is opened on the smooth pillow. The cooperation between the guiding key and the key groove helps to prevent the smooth pillow from rotating in the circumferential direction.

[0012] A further improvement of the present utility model is that there are two guiding keys, and the two guiding keys are arranged at both ends of the diameter line of the round hole.

[0013] A further improvement of the present utility model is that the slide base includes a base and a seat cover arranged above the base. Arc-shaped grooves are respectively opened on the opposite surfaces of the base and the seat cover, and the two arc-shaped grooves are combined to form a round hole for accommodating the smooth pillow, which is convenient for processing and manufacturing, as well as the assembly of the hydrostatic guide plate and the guiding key on the slide base.

[0014] A further improvement of the present utility model is that a driving groove communicating with the arc-shaped groove is provided in the base, a lead screw pair is provided in the driving groove, and a nut seat that cooperates with the lead screw pair and is connected to the smooth pillow is connected to the lead screw pair; a Z-axis motor for driving the rotation of the lead screw pair is provided at one end of the driving groove. The cooperation between the lead screw pair and the nut seat forms a ball screw pair mechanism, and under the driving action of the Z-axis motor, the smooth pillow is driven to move axially in the round hole.

[0015] A further improvement of the present utility model is that there are two driving grooves, and the two driving grooves are symmetrically arranged on both sides of the smooth pillow.

[0016] It can be seen from the above technical solutions that the beneficial effects of the present utility model are: the main shaft unit is arranged at the axis of the smooth pillow. At the same time, the smooth pillow cooperates with the hydrostatic guide plates evenly distributed in the round hole, so that the stiffness in all directions is the same. Thus, under the same load conditions, the deformations in all directions are the same, which further helps to improve the machining accuracy of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the specific embodiment of the present invention.

[0019] Figure 2 It is Figure 1 the schematic diagram of the A-A cross-section in

[0020] Figure 3 It is Figure 2 the schematic diagram of the B-B cross-section in

[0021] In the drawings: 1, smooth pillow; 2, seat cover; 3, base; 4, hydrostatic guide plate; 5, nut seat; 6, lead screw pair; 7, main drive shaft; 8, guide key; 9, spindle unit; 10, Z-axis motor; 11, hydrostatic oil film. SPECIFIC EMBODIMENTS

[0022] In order to make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments of the present invention. Obviously, the embodiments described below are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this patent.

[0023] As shown Figures 1-3 in the figure, a hydrostatic smooth pillow 1 of a gantry machining center includes a slide base, and a circular hole is provided in the slide base; the slide base includes a base 3 and a seat cover 2 arranged above the base 3. Circular arc grooves are respectively formed on the opposite surfaces of the base 3 and the seat cover 2, and the two circular arc grooves are combined into a circular hole for accommodating the smooth pillow 1. It is convenient for processing and manufacturing, as well as the assembly of the hydrostatic guide plate 4 and the guide key 8 on the slide base.

[0024] The smooth pillow 1 is slidably arranged in the circular hole; a main drive shaft 7 is provided at the axis center of the smooth pillow 1, and one end of the main drive shaft 7 is connected to a spindle unit 9.

[0025] Static pressure guide plates 4 are evenly distributed in the circumferential direction of the inner wall of the round hole; the side of the static pressure guide plate 4 close to the smooth pillow 1 is an arc surface that can be adapted to the surface of the smooth pillow 1. This helps to improve the adaptability between the static pressure guide plate 4 and the smooth pillow 1. An oil passage is provided in the static pressure guide plate 4, and a number of oil holes communicating with the oil passage are provided on the arc surface of the static pressure guide plate 4; a static pressure oil film 11 is provided between the static pressure guide plate 4 and the smooth pillow 1. The lubricating oil is discharged through the oil passage and the oil holes, so as to form a static pressure oil film 11 between the static pressure guide plate 4 and the smooth pillow 1, improving the guiding property of the smooth pillow 1.

[0026] A guiding key 8 extending along the axial direction of the round hole is provided in the sliding seat, and a key groove capable of cooperating with the guiding key 8 is provided on the smooth pillow 1. There are two guiding keys 8, and the two guiding keys 8 are arranged at both ends of the diameter line of the round hole. The cooperation between the guiding key 8 and the key groove helps to prevent the smooth pillow 1 from rotating in the circumferential direction; at the same time, the two guiding keys 8 can form a certain support for the smooth pillow 1, making the axis line of the smooth pillow 1 coincide with the axis line of the round hole.

[0027] A driving groove communicating with the arc-shaped groove is provided in the base 3, a lead screw pair 6 is provided in the driving groove, and a nut seat 5 that cooperates with the lead screw pair 6 and is connected to the smooth pillow 1 is connected to the lead screw pair 6; a Z-axis motor 10 for driving the lead screw pair 6 to rotate is provided at one end of the driving groove. The lead screw pair 6 and the nut seat 5 cooperate to form a ball screw pair 6 mechanism, and under the driving action of the Z-axis motor 10, the smooth pillow 1 is driven to move axially in the round hole. There are two driving grooves, and the two driving grooves are symmetrically arranged on both sides of the smooth pillow 1.

[0028] In summary, the working principle of this device: The smooth pillow 1 is installed in the sliding seat through the centrally symmetric static pressure guide plates 4, and the force is evenly distributed during processing, reducing the influence of transverse and longitudinal cutting forces on the sliding pillow. The smooth pillow 1 has strong rigidity, and the rigidity in all directions of the smooth pillow 1 is the same, improving the machining accuracy of the machine tool; the structure of the smooth pillow 1 is simple and easy to process, and the machining accuracy is higher and easier to guarantee; the smooth pillow 1 has low assembly requirements, is easier to install and has high installation accuracy, reducing the production cost of the machine tool, and the improvement of the accuracy of the smooth pillow 1 also improves the rigidity of the static pressure guide plate 4. The circular sliding pillow can better meet the requirements of the large gantry machining center for machining accuracy.

[0029] In the static pressure smooth pillow of the present utility model, the spindle unit is arranged at the axis of the smooth pillow, and at the same time, the smooth pillow cooperates with the static pressure guide plates evenly distributed in the round hole, so that the rigidity in all directions is the same. Therefore, under the same load conditions, the deformation in all directions is the same, which helps to improve the machining accuracy of the machine tool, is easy to process and has high machining accuracy, improving the overall machining accuracy and service life of the machine tool.

[0030] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0031] The terms "upper", "lower", "outer side", "inner side", etc. in the description, claims and above-mentioned drawings of the present utility model, if any, are used to distinguish the relative positions and do not need to be qualitatively defined. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A static pressure smooth spindle (1) of a gantry machining center, characterized in that, It includes a slide base. A round hole is provided in the slide base, and a smooth pillow (1) is slidably arranged in the round hole; static pressure guide plates (4) are uniformly distributed in the circumferential direction of the inner wall of the round hole; a main transmission shaft (7) is provided at the axis of the smooth pillow (1), and one end of the main transmission shaft (7) is connected to a main shaft unit (9).

2. The hydrostatic spherical spindle (1) of a gantry machining center according to claim 1, characterized in that, The surface of the static pressure guide plate (4) close to the smooth pillow (1) is an arc surface that can be adapted to the surface of the smooth pillow (1).

3. The hydrostatic spherical spindle (1) of a gantry machining center according to claim 2, characterized in that, An oil passage is provided in the static pressure guide plate (4), and a number of oil holes communicating with the oil passage are opened on the arc surface of the static pressure guide plate (4); A static pressure oil film (11) is provided between the static pressure guide plate (4) and the smooth pillow (1).

4. A hydrostatic spherical spindle (1) of a gantry machining center according to any one of claims 1 to 3, characterized in that A guide key (8) extending along the axial direction of the round hole is provided in the slide base, and a key groove that can cooperate with the guide key (8) is opened on the smooth pillow (1).

5. A hydrostatic spherical spindle (1) of a gantry machining center according to claim 4, characterized in that, There are two guide keys (8), and the two guide keys (8) are arranged at both ends of the diameter line of the round hole.

6. A hydrostatic spherical spindle (1) of a gantry machining center according to any one of claims 1 to 3, characterized in that, The slide base includes a base (3) and a seat cover (2) arranged above the base (3). Arc-shaped grooves are respectively opened on the opposite surfaces of the base (3) and the seat cover (2), and the two arc-shaped grooves are combined into a round hole for accommodating the smooth pillow (1).

7. A hydrostatic spherical spindle (1) of a gantry machining center according to claim 6, characterized in that, A drive groove communicating with the arc-shaped groove is provided in the base (3), a lead screw pair (6) is arranged in the drive groove, and a nut seat (5) that cooperates with the lead screw pair (6) and is connected to the smooth pillow (1) is connected to the lead screw pair (6); a Z-axis motor (10) for driving the lead screw pair (6) to rotate is provided at one end of the drive groove.

8. A hydrostatic spherical spindle (1) of a gantry machining center according to claim 7, characterized in that, There are two drive grooves, and the two drive grooves are symmetrically arranged on both sides of the smooth pillow (1).

Images