CN204725144U - Large-scale high rigidity numerical control static pressure rotary worktable - Google Patents

Abstract

The utility model provides a kind of large-scale high rigidity numerical control static pressure rotary worktable, comprise round table surface, base, step gland, SMD grating scale and torque motor, round table surface operates in high rigidity that carrying hydrostatic slideway etc. forms, high accuracy, anti abrasive dual-gripper hydrostatic bearing structure, directly driven by high thrust liquid-cooled slotless torque motor, working table movement position is controlled by SMD grating scale feedback closed loop, base with two enclose the land foot bolt support, be connected with ground.The utility model, under the prerequisite fully ensureing stage accuracy, simplifies structure, optimizes load transfer path, realizes large-scale workpiece high rigid support.

Description

Large high rigidity CNC static pressure rotary table

technical field

The utility model belongs to the field of numerical control machine tools, in particular to a large-scale high-rigidity numerical control static pressure rotary workbench.

Background technique

With the rapid development of marine equipment, ships, wind power, nuclear power, metallurgy, mining and other heavy industries, the demand for large precision machine tools is increasingly strong. Large CNC rotary table is a key component of large precision machine tools. Through the introduction of torque motor direct drive technology and static pressure technology, the accuracy of the table has been greatly improved. However, there is still a relatively acute problem in use, that is, the rigidity of the worktable. When processing large-scale workpieces, the diameter of the workpiece is much larger than that of the turntable, and the weight of the workpiece reaches tens of tons. After the workpiece is installed in place, the table is prone to deformation, which seriously affects the machining accuracy. Improving the rigidity of the large rotary table to ensure the accuracy maintenance is an urgent problem to be solved at present.

Utility model content

The purpose of the utility model is to provide a large-scale high-rigidity numerical control static pressure rotary table.

In order to achieve the above object, the utility model adopts the following technical solutions:

The rotary table includes a round table, a base, a stepped pressure sleeve and a torque motor. The outer cylindrical surface at the lower end of the circular table is set in the round hole at the upper end of the base. The centering oil chamber is evenly distributed on the circumference, the upper end surface of the base is provided with a load-bearing static pressure guide rail, the circular table is supported on the base by the load-bearing static pressure guide rail, and the stator of the torque motor is arranged on the upper end surface of the base in sections , the rotor of the torque motor is set on the lower end surface of the circular platform in sections, and an inner hole is opened on the circular platform, the lower end of the stepped pressure sleeve is connected with the upper end surface of the base, and the upper end of the stepped pressure sleeve is pressed against the bottom of the inner hole inwardly on the protruding part.

The rotary table also includes a patch type grating ruler, which is arranged on the wall surface of the inner hole, and the reading head of the patch type grating ruler is arranged on the transition plate, and the transition plate is set on the step pressure sleeve .

The stepped pressure sleeve is provided with a stepped pressure sleeve oil passage for delivering hydraulic oil to between the stepped pressure sleeve and the inwardly protruding part.

There are two load-bearing static pressure guide rails, the load-bearing static pressure guide rails are rubber-injected guide rails, and the torque motor is arranged between the two load-bearing static pressure guide rails.

The bottom of the base is supported by two circles of anchor bolts, and the installation positions of the two circles of anchor bolts correspond to the two bearing static pressure guide rails respectively.

The torque motor adopts a liquid-cooled slotless split torque motor.

A plurality of T-shaped slots for installing workpiece fixtures are opened on the upper end surface of the circular table top, and the T-shaped slots do not penetrate through the upper end surface of the circular table top.

The rotary table is a drum-shaped structure.

The center of the rotary table is a hollow structure, and the hollow structure is composed of the inner hole of the circular platform, the stepped pressure sleeve and the inner hole opened on the base.

The beneficial effects of the utility model are reflected in:

The rotary workbench described in the utility model utilizes the load-bearing static pressure guide rail, the centering oil chamber and the stepped pressure sleeve to form a hydrostatic bearing type support structure, which simplifies the structure of the rotary workbench and realizes high rigidity support for large workpieces.

Further, the circular table top of the utility model is equivalent to running on a high-rigidity, high-precision, and wear-resistant hydrostatic bearing, and is directly driven by a large-thrust liquid-cooled slotless torque motor, and the movement position of the rotary table is determined by SMD grating scale feedback closed-loop control, the base is supported by two circles of anchor bolts, which optimizes the load transmission path, realizes the rigid transmission of force, reduces deformation, and ensures the accuracy of the rotary table.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the top view of the utility model;

Among them, circular table top 1, torque motor 2, base 3, patch type grating ruler 4, step pressure sleeve 5, centering oil chamber 6, step pressure sleeve oil circuit 7, oil return pipeline 8, outer ring bearing static pressure guide rail 9 , The inner ring carries the static pressure guide rail 10, the transition plate 11, the anchor bolt installation hole 12, the cover plate 13, and the T-shaped groove 14.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing and embodiment.

Referring to Fig. 1, the large-scale high-rigidity numerical control static pressure rotary table of the present invention includes a circular table 1, a base 3, a step pressure sleeve 5, a patch type grating ruler 4 and a torque motor 2, and the outer surface of the lower end of the circular table 1 is The cylindrical surface is set in the circular hole at the upper end of the base 3, and the wall surface of the circular hole is provided with a plurality of centering oil chambers 6 evenly distributed along the circumference of the wall surface, and the upper end surface of the base 3 is provided with bearing static pressure There are two load-bearing static pressure guide rails, the load-bearing static pressure guide rails are made of glue-injected guide rails, the torque motor 2 is arranged between the two load-bearing static pressure guide rails, and the round table 1 is supported on the base 3 through the load-bearing static pressure guide rails , the stator section of the torque motor 2 is set on the upper end surface of the base 3, the rotor section of the torque motor 2 is set on the lower end surface of the circular table 1, and the torque motor 2 adopts a large thrust liquid-cooled grooveless split type torque Motor, the rotary table is directly driven by the torque motor, there is an inner hole on the circular table surface 1, the lower end of the stepped pressure sleeve 5 is connected with the upper end surface of the base 3, and the upper end of the stepped pressure sleeve 5 is pressed against the bottom of the inner hole inwardly on the protruding part. The stepped pressure sleeve 5 is provided with a stepped pressure sleeve oil circuit 7 for delivering hydraulic oil to the space between the stepped pressure sleeve 5 and the inwardly protruding part, and the movement position of the rotary table is fed back by a patch type grating ruler Closed-loop control, the patch type grating scale 4 is set on the wall of the inner hole, the reading head of the patch type grating scale 4 is set on the transition plate 11, and the transition plate 11 is set on the step pressure sleeve 5, the rotary work The platform is a drum-shaped structure, and the bottom of the base 3 is supported by two circles of anchor bolts, and the installation positions of the two circles of anchor bolts correspond to the two bearing static pressure guide rails respectively.

Referring to Fig. 2, the upper end surface of the circular table top 1 is provided with a plurality of T-shaped slots 14 (uniformly arranged) for installing workpiece fixtures, and the T-shaped slots 14 do not penetrate the upper end surface of the circular table top, and the rotary work The center of the platform is a hollow structure, which is composed of the inner hole of the circular platform 1, the stepped pressure sleeve 5 and the inner hole opened on the base 3, and the upper end surface of the inner hole of the circular platform is provided with a cover plate 13. When processing a long workpiece, open the cover, and the hollow structure is used to accommodate the unprocessed part of the long workpiece.

The working principle of the utility model is:

Firstly, before driving the round table surface 1 to rotate, inject hydraulic oil into the load-bearing static pressure guide rail, the step pressure sleeve oil circuit 7 and the centering oil chamber 6, and the hydraulic oil in the centering oil chamber 6 enters the outer cylindrical surface and the base 3 Between the walls of the round hole at the upper end, the centering support of the circular table 1 and the workpiece on it is realized; the hydraulic oil in the step pressure sleeve oil circuit 7 provides downward pressure on the circular table 1, and is connected with the bearing static pressure guide rail The force fit provided at the place to hold up the round table 1 realizes the anti-overturning support for the round table 1 and the workpiece on it. Then, a large-thrust liquid-cooled slotless split-type torque motor is used to drive the round table to rotate.

Example

As shown in Figure 1, a high-rigidity CNC static pressure rotary table for a large gear grinding machine includes a circular table 1, a base 3, a stepped pressure sleeve 5, a patch type grating scale 4 and a torque motor 2. The circular platform 1 is supported on the base 3 by two rings of load-carrying static pressure guide rails, and the stepped pressure sleeve 5 is installed on the base 3 to form an anti-overturning static pressure guide rail structure with the circular platform 1 . 8 sets of oil chambers are evenly distributed on the wall of the round hole of the base 3, and the outer cylindrical surface at the lower end of the round table 1 is put into the round hole of the base 3 to keep concentricity, forming a centering guide rail structure. The stator of the torque motor 2 is installed on the upper end surface of the base in sections, and the rotor is installed on the lower end surface of the circular platform 1 in sections. The patch type grating ruler 4 is installed on the wall of the inner hole of the circular table 1, and rotates with the circular table 1, and the reading head is installed on the step pressure sleeve 5, and remains stationary. The base 3 is supported by two circles of anchor bolts and connected to the foundation. The overall workbench is a drum-shaped structure to ensure a reasonable height-to-diameter ratio. Compared with the traditional flat structure, the structural rigidity is better. The base is supported by two circles of anchor bolts, and the anchor bolts are located under the load-bearing static pressure guide rail to avoid bending torque during load transmission and improve the deformation resistance. The base is cast with ductile iron instead of traditional gray cast iron, which has higher supporting strength. The load-bearing static pressure guide rail adopts two turns, the load-bearing area is large, and the support is more stable. Combined with the function of the step pressure sleeve, the overturning deformation of the circular table surface that occurs when carrying large-diameter workpieces is avoided. The centering oil chamber is located on the wall of the round hole of the base. The diameter of the centering oil chamber is several times larger than that of the traditional table spindle centering oil chamber, and the radial bearing capacity is higher.

As shown in Figure 2, the round table adopts an integral structure, and the T-shaped groove of the table extends along the radial direction of the end surface of the round table without opening, which improves the surface rigidity of the round table and avoids deformation when the workpiece is clamped.

The bearing static pressure guide rail adopts glue injection guide rail, which improves the processing and adjustment process of the static pressure guide rail. The torque motor adopts a liquid-cooled slotless split torque motor.

The rotary diameter of the workbench is 2.5 meters, the bearing capacity is 50 tons, the speed is 0~60rpm, the radial stiffness reaches 15KN/μm, the axial stiffness reaches 60KN/μm, the positioning accuracy reaches 1.5〞, and the repeat positioning accuracy reaches 1〞.

Claims (8)

1. one kind large-scale high rigidity numerical control static pressure rotary worktable, it is characterized in that: this rotary table comprises round table surface (1), base (3), step gland (5) and torque motor (2), the external cylindrical surface of described round table surface (1) lower end is arranged in the circular hole of base (3) upper end, the wall of described circular hole offers multiple centering oil pocket (6) along described wall even circumferential distribution, the upper surface of described base (3) is provided with carrying hydrostatic slideway, round table surface (1) is supported on base (3) by described carrying hydrostatic slideway, the stator-sectional of torque motor (2) is arranged on the upper surface of base (3), the rotor segment of torque motor (2) is arranged on the lower surface of round table surface (1), (1) offers endoporus to round table surface, the lower end of step gland (5) is connected with the upper surface of base (3), the upper end of step gland (5) is pressed in bottom described endoporus in projecting inward part.

2. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, it is characterized in that: described rotary table also comprises SMD grating scale (4), SMD grating scale (4) is arranged on the wall of described endoporus, the read head of SMD grating scale (4) was arranged on scale (11), crossed scale (11) and was arranged on step gland (5).

3. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, is characterized in that: be provided with in described step gland (5) for hydraulic oil being delivered to step gland (5) and described step gland oil circuit (7) between projecting inward part.

4. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, it is characterized in that: described carrying hydrostatic slideway is two, carrying hydrostatic slideway adopts glue injection guide rail, and torque motor (2) is arranged between two carrying hydrostatic slideways.

5. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 4, is characterized in that: described base (3) bottom adopts two foot bolts of enclosing the land to support, and two installation sites of enclosing the land foot bolt are distinguished corresponding with two carrying hydrostatic slideways.

6. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, is characterized in that: described torque motor (2) adopts the split type torque motor of liquid-cooled slotless.

7. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, it is characterized in that: the upper surface of described round table surface (1) offers multiple T-slot (14) for installing work piece holder, and described T-slot (14) does not open the upper surface of wearing round table surface.

8. a kind of large-scale high rigidity numerical control static pressure rotary worktable according to claim 1, it is characterized in that: described rotary table center is hollow-core construction, described hollow-core construction is made up of the endoporus of round table surface (1), step gland (5) and the endoporus be opened on base (3).