CN106514290A - Large-overturn-rigidity direct drive rotating table - Google Patents

Abstract

The invention relates to a direct-drive turntable with large overturning rigidity in the field of numerical control machining, which is characterized in that it comprises: a machine body, in which a motor stator, a motor rotor, a bearing seat, and a The rotating shaft bearing on the rotating shaft, the rotating shaft, the outer ring of the rotating shaft bearing and the bearing seat are used for interference fit, the inner ring of the rotating shaft bearing and the rotating shaft are used for interference fit; the supporting bearing, the supporting bearing is installed on the bearing seat, The outer ring and the inner ring of the support bearing respectively have a small interference fit with the bearing seat and the rotary disc; The turntable is also locked on the support bearing through the adjustment screw; the encoder is installed on the body. This structure can not only greatly improve the bearing capacity and overturning rigidity of the bearing platform, but also improve the machining accuracy and the stability of the turntable operation.

Description

A Direct Drive Turntable with High Overturning Rigidity

technical field

The invention relates to a direct-drive turntable with high overturning rigidity in the field of numerical control machining.

Background technique

Turntable plays an important role in CNC machining. However, the current turntables have the following problems: 1. Ordinary turntables require the support radius of the disk surface (generally the radius of the rotating shaft) to be 1/2 to 2/3 of the radius of the rotating disk. If it is less than this range, the tilting rigidity of the disk surface is not good, so that the edge of the disk surface swings up and down slightly during operation, resulting in obvious knife lines on the processed workpiece and poor surface finish. 2. Ordinary turntables use combined bearings to improve the overturning rigidity of their rotating tables, but the combined bearings occupy a large axial space and need to greatly increase the height of the turntable, which is unfavorable for the limited processing space of the machining center machine because This will occupy the processing space of the Z-axis of the machine tool and affect the Z-axis stroke of the tool. And the price of the combination bearing is much higher than that of the angular contact bearing, and the cost is too high.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a direct-drive turntable with high overturning rigidity; it can not only greatly improve the bearing capacity and overturning rigidity of the bearing platform, but also improve the machining accuracy and the stability of the turntable operation.

In order to achieve the above purpose, the present invention provides a direct drive turntable with high overturning stiffness, which mainly includes:

The machine body is equipped with a motor stator, a motor rotor, a bearing seat, a rotating shaft bearing installed on the bearing seat, and a rotating shaft in sequence from the outside to the inside, and the outer ring of the rotating shaft bearing and the bearing seat are used for interference fit , the inner ring of the rotating shaft bearing has an interference fit with the rotating shaft;

A support bearing, the support bearing is installed on the bearing seat, and the outer ring and the inner ring of the support bearing respectively have a small interference fit with the bearing seat and the rotary table to prevent radial movement of the support bearing;

A rotary disc, the rotary disc is installed above the machine body, the rotary disc is mounted on the rotating shaft through screws, and the rotary disc is also locked on the support bearing through the adjustment screws;

Encoder, the encoder is installed on the machine body.

Preferably, a bearing cover for pressing the outer ring of the rotary shaft bearing is installed above the rotary shaft bearing, and the bearing cover is locked by screws.

Preferably, a locking nut for locking the inner ring of the rotating shaft bearing is installed under the rotating shaft bearing.

Preferably, a rotary sealing ring is provided above the rotating shaft bearing.

Preferably, a bearing spacer is installed inside the rotating shaft bearing, and the rotating shaft bearing and the bearing spacer are arranged on the rotating shaft.

Preferably, the encoder is mounted on the machine body through an encoder mount.

When adjusting, use the dial gauge contact to hit the edge of the turntable, slowly turn the turntable, adjust the adjustment screws one by one, pre-tighten the support bearing, and observe the pointer of the dial gauge until it rotates a circle, the pointer of the watch No further changes or changes within the allowable range. Then push the thrust gauge against the edge of the turntable and apply a certain axial force. If the pointer of the watch remains unchanged or changes within the allowable range, it is qualified. At this time, the adjustment of the turntable is completed.

When the workpiece is placed on the disk, or the tool acts on the workpiece during processing, the load is shared by the rotating shaft and the supporting bearing. Due to the function of the supporting bearing, the bearing capacity and anti-overturning ability of the disk are improved. Ensure that the disk surface runs smoothly during processing, and prevent the disk surface from tilting. Especially when the center of gravity of the workpiece is not at the center of the rotary disk or the tool is machining the axial plane on the edge of the disk, the advantages of this structure are more obvious.

This structure is applied to CNC machine tools and used as the fourth axis of the machine tool to expand the surface of the disk. When processing large workpieces (reaching or exceeding a certain range of diameter of the rotary disk), it can ensure the processing accuracy of the workpiece to be processed, that is, to expand the surface of the workpiece. The size range of the workpiece to be processed. Moreover, this structure also increases the bearing capacity and overturning rigidity of the disk surface, ensures the stability of the disk surface during operation, detection or processing, and improves the reliability of the turntable.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of workpiece processing according to the present invention.

Among them, 1 is the body, 2 is the motor stator, 3 is the motor rotor, 4 is the shaft bearing, 5 is the bearing spacer, 6 is the bearing seat, 7 is the support bearing, 8 is the adjustment screw, 9 is the rotary table, 10, 14 Be a screw, 11 is a rotating shaft, 12 is a rotary sealing ring, 13 is a bearing gland, 15 is a lock nut, 16 is an encoder mount, 17 is an encoder, 18 is a cutter, and 19 is a workpiece.

detailed description

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

Referring to Figures 1-2, an embodiment of the present invention is a direct-drive turntable with high overturning stiffness, which mainly includes:

The body 1 is equipped with a motor stator 2, a motor rotor 3, a bearing seat 6, a rotating shaft bearing 4 installed on the bearing seat 6, and a rotating shaft 11 from outside to inside in sequence, and the rotating shaft bearing 4 The outer ring and the bearing seat 6 are interference fit, and the inner ring of the rotating shaft bearing 4 is interference fit with the rotating shaft 11;

Support bearing 7, said support bearing 7 is installed on the bearing housing 6, and the outer ring and inner ring of the supporting bearing 7 respectively make a small interference fit with the bearing housing 6 and the rotary disc 9, so as to prevent the diameter of the supporting bearing 7 from move towards;

Turntable 9, said turntable 9 is installed above the machine body 1, the turntable 9 is installed on the rotating shaft 11 through the screw 10, and the turntable 9 is also locked on the support bearing 7 through the adjustment screw 8;

An encoder 17 , the encoder 17 is installed on the machine body 1 through the encoder mounting base 16 .

A bearing gland 13 for pressing the outer ring of the rotating shaft bearing 4 is installed above the rotating shaft bearing 4, and the bearing gland 13 is locked by screws 14; Lock nut 15 of the inner ring. A rotating seal ring 12 is also provided above the rotating shaft bearing 4 ; a bearing spacer 5 is installed in the rotating shaft bearing 4 , and the rotating shaft bearing 4 and the bearing spacer 5 are installed on the rotating shaft 11 .

When adjusting, use the dial gauge contact to hit the edge of the rotary disk 9, turn the rotary disk 9 slowly, adjust the adjustment screws 8 one by one, pre-tighten the support bearing 7, and observe the pointer of the dial indicator until it rotates one circle , the pointer of the table no longer changes or changes within the allowable range. Then push the thrust gauge against the edge of the turntable 9 and apply a certain axial force. If the pointer of the watch remains unchanged or changes within the allowable range, it is qualified. At this time, the adjustment of the turntable is completed.

In Fig. 2, reference numeral 18 is a tool, and 19 is a workpiece. When the workpiece 19 is placed on the disk, or the tool 18 acts on the workpiece 19 during processing, the load is shared by the rotating shaft 11 and the supporting bearing 7. Due to the function of the supporting bearing 7, the bearing capacity and anti-overturning ability of the disk surface are improved. Ensure that the disk surface runs smoothly during processing, and prevent the disk surface from tilting. Especially when the center of gravity of the workpiece 19 is not at the center of the rotary disk 9 or the tool 18 is processing the axial plane on the edge of the disk surface, the advantages of this structure are more obvious.

This structure is applied to CNC machine tools and used as the fourth axis of the machine tool to expand the surface of the disk. When processing large workpieces (reaching or exceeding a certain range of diameter of the rotary disk), it can ensure the processing accuracy of the workpiece to be processed, that is, to expand the surface of the workpiece. The size range of the workpiece to be processed. Moreover, this structure also increases the bearing capacity and overturning rigidity of the disk surface, ensures the stability of the disk surface during operation, detection or processing, and improves the reliability of the turntable.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (6)

1. A direct-drive turntable with large overturning stiffness, characterized in that it mainly includes: The machine body is equipped with a motor stator, a motor rotor, a bearing seat, a rotating shaft bearing installed on the bearing seat, and a rotating shaft in sequence from the outside to the inside, and the outer ring of the rotating shaft bearing and the bearing seat are used for interference fit , the inner ring of the rotating shaft bearing has an interference fit with the rotating shaft; A support bearing, the support bearing is installed on the bearing seat, and the outer ring and the inner ring of the support bearing respectively have a small interference fit with the bearing seat and the rotary table; A rotary disc, the rotary disc is installed above the machine body, the rotary disc is mounted on the rotating shaft through screws, and the rotary disc is also locked on the support bearing through the adjustment screws; Encoder, the encoder is installed on the machine body. 2. A large overturning rigidity direct-drive turntable according to claim 1, characterized in that a bearing cover for pressing the outer ring of the rotating shaft bearing is installed above the rotating shaft bearing, and the bearing cover is locked by a screw tight. 3 . The direct-drive turntable with high overturning stiffness according to claim 1 , wherein a lock nut for locking the inner ring of the rotating shaft bearing is installed under the rotating shaft bearing. 4 . 4 . The direct-drive turntable with high overturning rigidity according to claim 1 , wherein a rotary sealing ring is provided above the rotating shaft bearing. 5 . 5 . The direct-drive turntable with high overturning stiffness according to claim 1 , wherein a bearing spacer is installed inside the rotating shaft bearing, and the rotating shaft bearing and the bearing spacer are arranged on the rotating shaft. 6 . 6 . The direct-drive turntable with high overturning stiffness according to claim 1 , wherein the encoder is installed on the machine body through an encoder mount. 6 .