Top mounting seat

Abstract

The object of the present invention is to provide a center mounting seat with good overall rigidity and high service life, which includes a sleeve connected to a machine tool. One end of the sleeve is fixedly connected with a bearing sleeve, and the two form a detachable connection. A taper sleeve is arranged inside the bearing sleeve. The taper sleeve and the bearing sleeve are axially limited and circumferentially rotatably matched through bearings. The taper of the inner cavity of the taper sleeve coincides with the taper of the outer wall of the center. In the above solution, since the connection between the bearing sleeve and the sleeve is detachable, a bearing with a larger specification model can be selected to improve the axial bearing capacity of the center, so that the cutting parameters can be increased during machining, the service life of the bearing can be extended, and thus the service life of the center can be improved. When the bearing is damaged, it can be used continuously after replacing the bearing, greatly reducing the use cost.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool auxiliary, and particularly relates to a center mounting seat. Background Art

[0002] When a machine tool processes a long shaft workpiece, one end of the workpiece is clamped by the chuck of the main shaft, and the other end will jump during the rotation driven by the main shaft. Therefore, a center is often set on the machine tool to stably support the end of the long shaft workpiece, so as to reduce the jump amount of its free end, and further improve the machining accuracy of the workpiece. At present, during the use of the center, due to the limitation of the outer dimension of the center, the bearing specifications used are small. During the machining process, the axial force that can be borne is small, the cutting parameters during machining are also small, and the machining efficiency is low; moreover, the damage rate of the center is relatively high, it is not convenient to repair after damage, and the use cost is high. Summary of the Invention

[0003] The purpose of the present invention is to provide a center mounting seat with good overall rigidity and high service life.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a center mounting seat, including a sleeve connected to the machine tool, one end of the sleeve is fixedly connected with a bearing sleeve and the two form a detachable connection, a tapered sleeve is arranged inside the bearing sleeve, the tapered sleeve and the bearing sleeve are axially limited and circumferentially rotatably matched through a bearing, and the taper of the inner cavity of the tapered sleeve coincides with the taper of the outer wall of the center.

[0005] In the above solution, since the bearing sleeve and the sleeve are detachably connected, larger specification bearings can be selected to improve the axial bearing capacity of the center, so that the cutting parameters can be increased during machining, the service life of the bearing can be improved, and thus the service life of the center can be improved. When the bearing is damaged, it can be used continuously after replacing the bearing, greatly reducing the use cost. Brief Description of the Drawings

[0006] Figure 1 It is a structural schematic diagram of the center mounting seat. Detailed Embodiment

[0007] Such as Figure 1As shown in the figure, a center mounting seat includes a sleeve 10 connected to a machine tool. One end of the sleeve 10 is fixedly connected to a bearing sleeve 20, and the two form a detachable connection. A tapered sleeve 30 is arranged inside the bearing sleeve 20. The tapered sleeve 30 and the bearing sleeve 20 are axially limited and circumferentially rotatably matched through a bearing 80. The taper of the inner cavity of the tapered sleeve 30 coincides with the taper of the outer wall of the center. The sleeve 10 is fixed on the tailstock of the machine tool. Since the bearing sleeve 20 and the sleeve 10 are detachably connected, a bearing 80 with a larger specification model can be selected to improve the axial bearing capacity of the center, so that the cutting parameters can be increased during machining, the service life of the bearing 80 can be extended, and thus the service life of the center can be improved. When the bearing 80 is damaged, the bearing 80 can be replaced and continue to be used, greatly reducing the use cost.

[0008] The bearing 80 includes a radial thrust bearing 81 and a plain bearing 82. The inner and outer raceways of the radial thrust bearing 81 are offset from each other in the axial direction of the bearing axis. The inner ring of the radial thrust bearing 81 is synchronously rotatably matched with the tapered sleeve 30, and the outer ring abuts against the inner wall of the bearing sleeve 20. The end of the inner ring of the radial thrust bearing 81 abuts against the step provided on the outer wall of the tapered sleeve 30 to form an axial limit fit, and the end of the outer ring abuts against the step provided on the inner wall of the bearing sleeve 20 to form an axial limit fit. The outer wall of the cage on one side of the plain bearing 82 abuts against the step provided on the outer wall of the tapered sleeve 30 to form a radial limit fit, and the outer wall of the cage on the other side abuts against the step provided on the inner wall of the bearing sleeve 20 to form a radial limit fit. The radial thrust bearing 81 is also called an angular contact ball bearing. The angular contact ball bearing can simultaneously bear radial load and axial load and can work at a relatively high speed. The plain bearing 82 mainly bears axial load in the assembly and can obtain high load capacity and high stiffness in a very small space. Here, by arranging the radial thrust bearing 81 and the plain bearing 82 to bear the axial force and radial force during machining, the bearing capacity of the center is significantly improved.

[0009] The radial thrust bearing 81 is a double-row thrust bearing. One end of the double-row thrust bearing abuts against the steps on the tapered sleeve 30 and the bearing sleeve 20, and the other end abuts against the bearing cover 40 provided at the end of the bearing sleeve 20 to form an axial limit fit. The double-row thrust bearing is also called a double-row angular contact ball bearing, which is a structure in which the outer ring backs of two single-row angular contact ball bearings are mated, and the inner and outer rings are each an integral body. Therefore, the imported bearing of this structure has the thrust load capacity in two directions, can bear the combined radial and axial load and moment load mainly composed of a large radial load, and limits the axial displacement of the shaft in both directions.

[0010] To realize the connection between the sleeve 10 and the bearing sleeve 20, a transition plate 50 is arranged between the sleeve 10 and the bearing sleeve 20. The sleeve 10 is fixedly connected to the transition plate 50 through a screw 60, and the bearing sleeve 20 is fixedly connected to the transition plate 50 through a screw 60.

[0011] A retaining ring 70 is provided at a position near the inner end of the tapered sleeve 30. The retaining ring 70 and the tapered sleeve 30 form a transition fit. A thrust ball bearing 83 is provided between the retaining ring 70 protruding outside the tapered sleeve 30 and the bearing sleeve 20, and the two form a circumferential rotational fit. Since the retaining ring 70 and the tapered sleeve 30 move synchronously, the thrust ball bearing 83 is provided between the retaining ring 70 and the bearing sleeve 20, so that the retaining ring 70 and the bearing sleeve 20 form a circumferential rotational connection.

[0012] The inner ring of the thrust ball bearing 83 and the retaining ring 70 form a synchronous rotational fit, the outer ring abuts against the inner wall of the bearing sleeve 20, the end of the inner ring of the ball bearing 33 abuts against the step provided on the outer wall of the retaining ring 70 to form an axial limiting fit, and the end of the outer ring abuts against the step provided on the inner wall of the bearing sleeve 20 to form an axial limiting fit.

[0013] In order to ensure that the axis of the center point always lies on the same straight line during the rotary machining process, the sleeve 10, the bearing sleeve 20, the tapered sleeve 30 and the retaining ring 70 are arranged concentrically.

Claims

1. A tip mounting base, characterized in that: It includes a sleeve (10) connected to a machine tool. One end of the sleeve (10) is connected with a bearing sleeve (20), and the two form a detachable connection. A taper sleeve (30) is arranged inside the bearing sleeve (20). The taper sleeve (30) and the bearing sleeve (20) are axially limited and circumferentially rotatably matched through a bearing (80). The taper of the inner cavity of the taper sleeve (30) coincides with the taper of the outer wall of the center point. The bearing (80) is located in the lumen of the bearing sleeve (20). The bearing (80) includes a radial thrust bearing (81) and a plain bearing (82). The inner and outer raceways of the radial thrust bearing (81) are offset from each other in the axial direction of the bearing axis. The inner ring of the radial thrust bearing (81) is synchronously rotatably matched with the taper sleeve (30), and the outer ring is in contact with the inner wall of the bearing sleeve (20). The end of the inner ring of the radial thrust bearing (81) abuts against the step provided on the outer wall of the taper sleeve (30) to form an axially limited fit, and the end of the outer ring abuts against the step provided on the inner wall of the bearing sleeve (20) to form an axially limited fit. The outer wall of the cage on one side of the plain bearing (82) abuts against the step provided on the outer wall of the taper sleeve (30) to form a radially limited fit, and the outer wall of the cage on the other side abuts against the step provided on the inner wall of the bearing sleeve (20) to form a radially limited fit. A retaining ring (70) is arranged at a position near the inner end of the taper sleeve (30). The retaining ring (70) and the taper sleeve (30) form a transition fit. A thrust ball bearing (83) is arranged between the retaining ring (70) protruding outside the taper sleeve (30) and the bearing sleeve (20), and the two form a circumferentially rotatable fit. The inner ring of the thrust ball bearing (83) is synchronously rotatably matched with the retaining ring (70), and the outer ring is in contact with the inner wall of the bearing sleeve (20). The end of the inner ring of the thrust ball bearing (83) abuts against the step provided on the outer wall of the retaining ring (70) to form an axially limited fit, and the end of the outer ring abuts against the step provided on the inner wall of the bearing sleeve (20) to form an axially limited fit. A transition plate (50) is arranged between the sleeve (10) and the bearing sleeve (20). The sleeve (10) is fixedly connected to the transition plate (50) through a screw (60). The bearing sleeve (20) is fixedly connected to the transition plate (50) through a screw (60).

2. The center mounting seat according to claim 1, characterized in that: The radial thrust bearing (81) is a double-row thrust bearing. One end of the double-row thrust bearing abuts against the steps on the taper sleeve (30) and the bearing sleeve (20), and the other end abuts against the bearing cover (40) provided at the end of the bearing sleeve (20) to form an axially limited fit.

3. The tip mounting base according to any one of claims 1-2, characterized in that: The sleeve (10), the bearing sleeve (20), the taper sleeve (30) and the retaining ring (70) are concentrically arranged.

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