CN2843681Y - Rotary centering holder - Google Patents

Abstract

The utility model provides a rotary center frame, which comprises a chuck body and a jaw arranged at the end face of the chuck body. The utility model is characterized in that the other end face of the chuck body is connected with a main shaft which is provided with two sets of high-precision bearings, wherein the main shaft and the high-precision bearings are arranged in a box body which is fixed on a base, and the high-precision bearings are axially locked by adjusting nuts. The rotary center frame changes the chucking method of original traditional workpieces, eliminates the radial runout of the workpieces caused by rotation errors of the centre frame, ensures the smooth running of machine tools and the process precision of the workpieces, simultaneously provides convenient conditions and simple technology to manufacture of modern numerical controlled precision machine tools, and is particularly suitable for the support of workpiece process of long shafts and deep holes.

Description

Rotation Center Rest

Technical field the utility model relates to a kind of Machinetool workpiece bracing or strutting arrangement of field of machining, the Rotation Center Rest that supports when being specifically related to a kind of high accuracy long-axle workpieces and deep hole machining.

Background technology is present, at the used centre frame of the lathe of longaxones parts processing industry, all is the generic central frame of three-jaw or four paws single action.But the time with this device supporting workpiece, because of its running accuracy low, add foozle and rigging error, when work, workpiece is difficult to guarantee very high running accuracy, especially the long-axle workpieces of some special industries and the precision of deep hole machining are difficult to assurance, thereby influence the raising of machine tool accuracy, the development of serious limit number controlled machine.

The purpose of summary of the invention the utility model device is to provide a kind of precision that can improve mechanical field machining high-precision long-axle workpieces and deep hole, and then improves the Rotation Center Rest of machine tool accuracy.

For achieving the above object, the technical scheme that the utility model is taked is: this Rotation Center Rest comprises chuck body, is contained in the claw on the chuck body end face, the other end that it is characterized in that described chuck body links to each other with main shaft, two cover high-precision bearings are housed on the main shaft, main shaft and high-precision bearing are contained in the casing, and by adjusting nut axial locking high-precision bearing, casing is fixed on the base.

The above-mentioned pivot rack device that the utility model provides, changed original traditional workpiece chucking method, and eliminated because the workpiece circular runout that the rotation error of centre frame causes, the even running of lathe and the machining accuracy of workpiece have been guaranteed, simultaneously for making modern numerically-controlled precise lathe provide convenience condition and simple process, be particularly suitable for major axis and deep hole workpiece are added the support in man-hour.

Appended drawings is the structural representation of Rotation Center Rest

Among the figure: the 1-casing; The high-accuracy bearing of 2-; 3-adjusts nut; The 4-main shaft; The 5-base; The 6-claw; 7-tightens pressing plate; The 8-chuck body.

The specific embodiment as shown in drawings, chuck body 8 is contained on the main shaft 4, claw 6 is contained on the chuck body 8, by screw mandrel chucking workpiece, two cover high-precision bearings 2 are housed on the main shaft 4, main shaft 4 and high-accuracy bearing 2 all are contained in the casing 1, and by adjusting the high-accuracy bearing 2 of nut 3 axial lockings, can get very high running accuracy like this; Casing 1 is fixed on the base 5 by bolt, chucking pressing plate 7.

The base 5 of this Rotation Center Rest is installed on the bed piece, can move along the lathe bed longitudinal maneuver, and can adjust the Rotation Center Rest position of center line at height, horizontal both direction.Before lathe work, earlier workpiece is penetrated in the through hole of Rotation Center Rest main shaft 4, one of workpiece contacts and tightens with machine tool chief axis, the other end is by 6 chuckings of the claw on the Rotation Center Rest, before chucking, look for table, workpiece centre is overlapped with the center of Rotation Center Rest main shaft 4, can adjust running accuracy by adjusting nut 3.When machine tool chief axis rotates, drive chuck body 8 by workpiece, workpiece and Rotation Center Rest main shaft 4 are rotated synchronously, because two cover high-precision bearings 2 are housed on the Rotation Center Rest main shaft 4, thereby guaranteed running accuracy, simultaneously also guarantee machining accuracy, both realized the effect of this Rotation Center Rest supporting workpiece, also guaranteed the high accuracy of long-axle workpieces and deep hole machining.

Claims (2)

1, a kind of Rotation Center Rest, comprise chuck body (8), be contained in the claw (6) on chuck body (8) end face, the other end that it is characterized in that described chuck body (8) links to each other with main shaft (4), two cover high-precision bearings (2) are housed on the main shaft (4), main shaft (4) and high-precision bearing (2) are contained in the casing (1), and by adjusting nut (3) axial locking high-precision bearing (2), casing (1) is fixed on the base (5).

2, Rotation Center Rest according to claim 1 is characterized in that above-mentioned casing (1) is fixed on the base (5) by bolt, chucking pressing plate (7).

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