High-precision center device easy to disassemble and assemble and capable of displaying jacking force and used for large machine tool

Abstract

The utility model discloses a high-precision center device easy to disassemble and assemble and capable of displaying jacking force for a large machine tool. The high-precision center device comprises an adaptive sleeve. One end of the tail bracket is detachably and fixedly connected with the tail bracket tip and is provided with an open slot for accommodating the tail bracket tip; the rotary core shaft is mounted in the cavity of the adaptive sleeve; one end far away from the tailstock tip penetrates through the end surface of the adaptive sleeve on the side; the periphery of the rotary core shaft is sleeved with a bearing playing a supporting role; the feedback sleeve is sleeved on the periphery of the rotary core shaft positioned in the adaptive sleeve, and the feedback sleeve is provided with a chamfer inclined surface; the telescopic component is arranged on one side of the chamfer inclined surface; the telescopic component can stretch out and draw back in the axial direction of the rotary mandrel. One end of the jacking force display meter is in contact with the bevel of the chamfer to obtain the elastic force applied by the telescopic component; the tip is connected with the end, away from the tailstock tip, of the rotary mandrel. The clamping device has the advantages of being compact and simple in structure, controllable in jacking force, high in rotation precision, high in universality, convenient to assemble and disassemble, capable of saving clamping, short in adjusting time and the like.

Description

Technical Field

[0001] This utility model relates to the field of machine tool accessory device processing and production, and in particular to a high-precision centering device for large machine tools that is easy to disassemble and install and has a clamping force display. Background Technology

[0002] With the rapid development of aerospace, petroleum energy, and military industries, the requirements for machining precision in machine tools are becoming increasingly stringent. However, some users find it particularly difficult to machine these high-precision parts due to limitations inherent in the machine tool's structure. For example, low rotational precision of the tailstock spindle results in low center rotation precision; the lack of a clamping force display device on the tailstock means that the clamping force is controlled primarily by the operator's feel, making the workpiece prone to bending and deformation. Solving these problems often requires replacing the tailstock with a high-precision one, which is costly. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a high-precision centering device with easy disassembly and assembly and clamping force display for large machine tools, thereby improving the machining accuracy of machine tools.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-precision centering device for large machine tools that is easy to disassemble and assemble, and has a clamping force display, comprising,

[0005] The adapter has a cavity for accommodating the rotating spindle; one end of the adapter is detachably and fixedly connected to the tailstock tip, and this end has a slot for accommodating the tailstock tip.

[0006] A rotary spindle is installed in the cavity of the fitting; the end away from the tailstock tip passes through the end face of the fitting on that side; a bearing for support is fitted around the outer periphery of the rotary spindle;

[0007] A feedback sleeve is fitted around the outer periphery of a rotary spindle located within the adapter, the feedback sleeve having a chamfered bevel; a telescopic component is disposed on one side of the chamfered bevel; the telescopic component can extend and retract along the axial direction of the rotary spindle;

[0008] The tensioning force display gauge has one end in contact with the chamfered bevel to obtain the elastic force applied by the telescopic component; the center point is connected to the end of the rotating spindle away from the center point of the tailstock.

[0009] According to this utility model, the outer periphery of the rotary mandrel is further fitted with an end face ball bearing that is configured to allow for axial runout.

[0010] According to this utility model, the bearing further includes a first needle roller bearing and a second needle roller bearing that are clearance-fitted with the outer diameter of the rotary mandrel. The two bearings are located at the front end and rear end of the rotary mandrel, respectively, and are used to support the rotary mandrel.

[0011] According to this utility model, the retractable component is a disc spring.

[0012] According to this utility model, the adapter is further provided with lifting screws.

[0013] The advantages of this utility model compared with the prior art are:

[0014] 1. This utility model has a novel and reliable structure, and is easy to install and operate. The application of this structure significantly improves the precision of workpiece processing, reduces worker errors, and lowers manufacturing costs.

[0015] 2. This utility model has a slot for accommodating the tailstock tip, which can be adapted with high precision to different machine tool tip angles and interfaces. It has a clamping force display in the middle, which can accurately know the actual clamping force of the workpiece. The angle of the front tip can also be configured according to the tip hole angle of the workpiece. At the same time, the device is easy and quick to disassemble.

[0016] 3. This utility model has a compact and simple structure, controllable clamping force, high rotation accuracy, strong versatility, convenient assembly and disassembly, and saves clamping and adjustment time. Attached Figure Description

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0018] Figure 1 This is a cross-sectional schematic diagram of a high-precision centering device with easy disassembly and assembly and clamping force display for large machine tools according to this utility model.

[0019] Figure 2 This is a schematic diagram of the easily detachable, high-precision centering device with clamping force display for large machine tools according to this utility model.

[0020] Figure 3 for Figure 1 A magnified view of part A.

[0021] In the picture,

[0022] 1-Top point, 2-Tightening force gauge, 3-Lifting part, 4-Tail frame top point, 5-Adaptive fitting, 6-Feedback sleeve, 61-Chamfered bevel, 7-Washer, 8-Rotating spindle, 9-First needle roller bearing, 10-End face ball bearing, 11-Positioning pin, 12-Butterfly spring, 13-Second needle roller bearing, 14-Adjustment panel, 15-Anti-rotation bracket. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1-2 As shown, a high-precision centering device with easy disassembly and clamping force display for large machine tools includes an adapter 5. The adapter 5 is a sleeve-shaped structure with a cavity for accommodating a rotating spindle. A rotating spindle 8 is coaxially mounted inside the cavity. A center 1 is positioned at one end of the rotating spindle 8. The center 1 is located on the outside of the adapter 5, and the side of the adapter 5 away from the center 1 is fixedly connected to a tailstock center 4. To facilitate the installation of the adapter 5 and the tailstock center 4, a lifting screw 3 is installed on the adapter 5. The adapter 5 can be fixed to the tailstock center 4 by the lifting screw 3. The surface of the adapter 5 facing the tailstock center 4 has a mounting groove to accommodate the tailstock center 4. In the assembled state, the mounting groove is coaxially assembled with the tailstock center 4, improving the installation accuracy of both. The mounting groove communicates with the cavity accommodating the rotating spindle. The angle of the center 1 at the front end of the tailstock can be designed according to user requirements.

[0025] Specifically, the outer periphery of the rotary spindle 8 is fitted with a first needle roller bearing 9 and a second roller bearing 13 located at the front and rear, respectively. The two needle roller bearings are high-precision needle roller bearings and neither of them contains an inner ring. They provide radial support for the rotary spindle 8. The clearance fit between the outer diameter of the rotary spindle 8 and the two high-precision needle roller bearings achieves high-precision rotation.

[0026] To improve the accuracy of the axial runout of the rotary spindle 8, a high-precision end-face ball bearing 10 is installed on its outer circumference.

[0027] To precisely adjust the clamping force of the centering device, a feedback sleeve 6 is fitted around the outer periphery of the rotary spindle 8. A butterfly spring 12 is fitted around the outer periphery of the feedback sleeve 6. One end of the butterfly spring 12 is connected to the feedback sleeve 6, and the other end of the butterfly spring 12 is fixedly connected to the adapter 5. A chamfered bevel 61 is provided on the side of the feedback sleeve 6 facing the butterfly spring 12. A clamping force gauge 2 is installed on the adapter 5. One end of the clamping force gauge 2 is located in the cavity of the adapter 5 and contacts the chamfered bevel 61. When the butterfly spring 12 is subjected to an external clamping force, it will undergo compression deformation and simultaneously apply a force to the clamping force gauge 2 in the opposite direction to the clamping force. The clamping force gauge 2 accurately obtains the clamping force of the workpiece through the compression of the butterfly spring 12 and the chamfered bevel 61 on the feedback sleeve 6. The feedback sleeve 6 is fixed to the outer periphery of the rotary spindle 8 by the positioning pin 11. The axis of the positioning pin 11 is perpendicular to the axis of the rotary spindle 8. The slope of the inclined surface is designed according to the clamping force gauge 2 and the compression force gauge of the disc spring 12.

[0028] In this embodiment, the tailstock tip 4 is a movable tip. To prevent relative rotation between the tip device and the tailstock tip 4, an anti-rotation bracket 15 is provided between them. Preferably, the anti-rotation bracket 15 is right-angled, with one side fixedly connected to the adapter 5 and the other side fixed to the tailstock of the fish tailstock tip 4, effectively preventing relative rotation between them and ensuring overall stability.

[0029] Working principle: The adapter 5 of the device is fixed to the tailstock tip 4 using lifting screws 3, while the anti-rotation bracket 5 prevents relative rotation between the adapter and the tailstock tip 4. The angle of the front tip 1 can be designed according to user requirements. The tip 1 is fixedly positioned with the rotating spindle 8, and a washer 7 is placed between them. The rotating spindle 8 is radially supported by two high-precision needle roller bearings without inner rings. The clearance fit between the outer diameter of the rotating spindle 8 and the two high-precision needle roller bearings achieves high-precision rotation. The axial runout accuracy of the rotating spindle 8 is achieved by high-precision end-face ball bearings 10. The workpiece clamping force is accurately obtained by the clamping force gauge 2 through the compression of the disc spring 12 and the chamfered bevel 61 on the feedback sleeve 6.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-precision centering device for large machine tools that is easy to assemble and disassemble and has a clamping force display, characterized in that, include, The adapter has a cavity for accommodating the rotating spindle; one end of the adapter is detachably and fixedly connected to the tailstock tip, and this end has a slot for accommodating the tailstock tip. A rotary spindle is installed in the cavity of the fitting; the end away from the tailstock tip passes through the end face of the fitting on that side; a bearing for support is fitted around the outer periphery of the rotary spindle; A feedback sleeve is fitted around the outer periphery of a rotary spindle located within the adapter, the feedback sleeve having a chamfered bevel; a telescopic component is disposed on one side of the chamfered bevel; the telescopic component can extend and retract along the axial direction of the rotary spindle; A tensioning force display, one end of which contacts the chamfered bevel, to obtain the elastic force applied by the retractable component; The tip is connected to the end of the slewing spindle furthest from the tailstock tip.

2. The high-precision centering device with easy disassembly and mounting and clamping force display for large machine tools as described in claim 1, characterized in that, The outer circumference of the rotating spindle is also fitted with an end face ball bearing that is designed to allow for axial runout.

3. The high-precision centering device with easy disassembly and mounting and clamping force display for large machine tools as described in claim 1 or 2, characterized in that, The bearing includes a first needle roller bearing and a second needle roller bearing that are clearance-fitted with the outer diameter of the rotary mandrel. The two bearings are located at the front end and rear end of the rotary mandrel, respectively, and are used to support the rotary mandrel.

4. The high-precision centering device with easy disassembly and mounting and clamping force display for large machine tools as described in claim 1, characterized in that, The retractable component is a disc spring.

5. The high-precision centering device with easy disassembly and mounting and clamping force display for large machine tools as described in claim 1, characterized in that, The adapter is equipped with lifting screws.

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