Automatic centering center frame of numerical control machine tool

Abstract

The utility model relates to a numerical control machine tool automatic centering center frame which comprises a support and a self-centering assembly arranged on the support, three clamping arms are connected between the support and the self-centering assembly in a rotating mode, a hole is formed in the support, and the clamping arms are distributed along the edge of the hole in the circumferential direction in an array mode. The self-centering assembly is used for driving the three clamping arms to synchronously get close to or get away from the center of the hole, a driving device is arranged on the support and used for driving the self-centering assembly to rotate, the self-centering assembly is driven by the driving device to rotate, and then the three clamping arms are driven by the self-centering assembly to synchronously get close to or get away from the center. Therefore, the rigidity of the workpiece and the cutting stability can be enhanced, the machining error is reduced, the manual operation is reduced, the machining cost is reduced, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of center frames, in particular to an automatic centering center frame for numerically controlled machine tools. Background Art

[0002] A center rest is an auxiliary device used to radially support a rotating workpiece during machining. It is usually fixed to the machine tool's bed guide rails and has three independently movable support claws. The contact between the support claws and the workpiece support surface can be adjusted to an appropriate tightness to increase the rigidity of the workpiece and facilitate cutting. The center rest is designed to solve problems encountered when machining longer workpieces, especially slender shaft parts, by increasing the rigidity of the workpiece to reduce possible bending or deformation of the workpiece during machining.

[0003] Traditional center frames generally use two-point or three-point support, and each support rod is manually adjusted to achieve the purpose of concentricity with the main spindle. The accuracy of the adjustment depends on the experience and feel of the skilled workers. This method is not reliable, and its accuracy and efficiency are low, which cannot meet the high precision and high efficiency requirements of CNC machine tools. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an automatic centering center frame for a CNC machine tool.

[0005] The purpose of the utility model can be achieved through the following technical solution: an automatic centering center frame for a CNC machine tool, comprising a bracket, a self-centering component arranged on the bracket, three clamping arms rotatably connected between the bracket and the self-centering component, a hole is opened on the bracket, and the clamping arms are distributed in a circumferential array along the edge of the hole, the self-centering component is used to drive the three clamping arms to synchronously move toward or away from the center of the hole, and a driving device is provided on the bracket, which is used to drive the self-centering component to rotate.

[0006] Preferably, the self-centering assembly includes a support ring fixedly connected to the bracket, a synchronization ring is rotatably connected to the support ring, a guide groove is provided on the synchronization ring, and a pin that cooperates with the guide groove is provided on the clamping arm.

[0007] Preferably, the driving device includes a hydraulic cylinder arranged on the bracket, and the output end of the hydraulic cylinder is hinged to the synchronizer ring.

[0008] Preferably, the clamping arm is in an arc-shaped structure, and avoidance grooves are provided at positions corresponding to the clamping arms on the support ring and the synchronization ring.

[0009] Preferably, a roller is rotatably provided at one end of the clamping arm.

[0010] Preferably, accommodating grooves are provided on the bracket and the support ring at positions corresponding to the rollers.

[0011] Preferably, a notch corresponding to the machine tool guide rail is provided at the bottom of the bracket, and a base plate is connected to the bottom of the bracket by bolts.

[0012] The beneficial effects of the present invention are as follows: the present invention drives the self-centering component to rotate through the driving device, and then drives the three clamping arms to move toward or away from the center synchronously through the self-centering component, so that the workpiece is automatically concentric with the main shaft, which not only enhances the rigidity of the workpiece and the stability of cutting, reduces processing errors, but also reduces manual operation, reduces processing costs, and greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0014] Figure 1 The utility model is a structural schematic diagram of an automatic centering center frame of a CNC machine tool.

[0015] Figure 2 The utility model is a schematic diagram of the support structure of an automatic centering center frame of a CNC machine tool.

[0016] Figure 3 The utility model is a schematic diagram of the structure of a self-centering component of an automatic centering center frame of a CNC machine tool.

[0017] Figure 4 The utility model is a schematic diagram of the support ring structure of the automatic centering center frame of a CNC machine tool.

[0018] Figure 5 The utility model is a schematic diagram of the structure of a synchronous ring of an automatic centering center frame of a CNC machine tool.

[0019] The numbers shown in the figure represent: 1. bracket; 101. notch; 102. bolt; 103. base plate; 2. self-centering assembly; 201. support ring; 202. synchronization ring; 203. guide groove; 204. avoidance groove; 205. accommodating groove; 3. clamping arm; 301. pin; 302. roller; 4. hydraulic cylinder. DETAILED DESCRIPTION

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0022] The following will be combined with specific embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] See Figures 1 to 5 As shown, the structure of the present invention is: an automatic centering center frame for a CNC machine tool, comprising a bracket 1, a self-centering component 2 arranged on the bracket 1, three clamping arms 3 rotatably connected between the bracket 1 and the self-centering component 2, a hole is opened on the bracket 1, and the clamping arms 3 are distributed in a circumferential array along the edge of the hole, and the self-centering component 2 is used to drive the three clamping arms 3 to synchronously move toward or away from the center of the hole, and a driving device is provided on the bracket 1, and the driving device is used to drive the self-centering component 2 to rotate. Specifically, the self-centering component 2 is driven to rotate by the driving device, and then the three clamping arms 3 are driven to synchronously move toward the center of the hole by the self-centering component 2, and the axis of the spindle is automatically aligned while clamping the workpiece, thereby improving the efficiency of finding the center of the workpiece, enhancing the rigidity of the workpiece and the stability of the cutting, and reducing processing errors.

[0024] like Figures 2 to 5 As shown, the self-centering component 2 includes a support ring 201 fixedly connected to the bracket 1, a synchronization ring 202 is rotatably connected to the support ring 201, a guide groove 203 is provided on the synchronization ring 202, and a pin 301 cooperating with the guide groove 203 is provided on the clamping arm 3. Specifically, the three clamping arms 3 are rotatably arranged between the support ring 201 and the bracket 1. The synchronization ring 202 is rotated to cooperate with the pin 301 through the guide groove 203, thereby driving the three clamping arms 3 to rotate and synchronously move toward or away from the center.

[0025] like Figure 1 、 Figure 2 As shown, the driving device includes a hydraulic cylinder 4 provided on the bracket 1 , and the output end of the hydraulic cylinder 4 is hinged to the synchronizer ring 202 . Specifically, the hydraulic cylinder 4 is used to drive the synchronizer ring 202 to rotate, thereby driving the clamping arm 3 to clamp the workpiece and automatically find the center.

[0026] like Figure 4 、 Figure 5As shown, the clamping arms 3 have an arc-shaped structure, and avoidance grooves 204 are provided at positions corresponding to the clamping arms 3 on the support ring 201 and the synchronization ring 202. Specifically, when the three clamping arms 3 are opened, the clamping arms 3 with an arc-shaped structure can be stored in the avoidance grooves 204, which can prevent the movement of the clamping arms 3 from being restricted and enable the center frame to adapt to workpieces with larger diameters.

[0027] like Figure 2 、 Figure 3 As shown, a roller 302 is rotatably provided at one end of the clamping arm 3. Specifically, the roller 302 can reduce the friction resistance with the workpiece and prevent the surface of the workpiece from being scratched during processing.

[0028] like Figure 2 、 Figure 4 As shown, the bracket 1 and the support ring 201 are provided with a receiving groove 205 at the position corresponding to the roller 302. Specifically, the receiving groove 205 is used to accommodate the roller 302 when the clamping arm 3 is opened, further allowing the center frame to adapt to workpieces with larger diameters.

[0029] like Figure 2 As shown, a notch 101 corresponding to the machine tool guide rail is provided at the bottom of the bracket 1, and a base plate 103 is connected to the bottom of the bracket 1 by a bolt 102. Specifically, the notch 101 on the bracket 1 is aligned with the guide rail, and the installation position of the bracket 1 is adjusted and corrected through the notch 101 to ensure its stability and accuracy. Then, the bolt 102 is tightened to clamp the base plate 103 to the bed at the bottom of the machine tool guide rail, thereby firmly fixing the bracket 1 on the machine tool.

[0030] During specific use, the bracket 1 is installed on the machine tool guide rail, and then the workpiece is passed through the hole on the bracket 1 and clamped to the spindle of the machine tool. The self-centering component 2 is then driven to rotate by the driving device, and then the three clamping arms 3 are driven synchronously by the self-centering component 2 to move closer to the center of the hole. While clamping the workpiece, it is automatically aligned with the axis of the spindle, so that the workpiece is supported, the rigidity of the workpiece and the cutting stability are enhanced, and the processing error is reduced.

[0031] The above further describes the present invention with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. An automatic centering steady rest for a CNC machine tool, characterized by: The invention comprises a bracket (1), a self-centering component (2) arranged on the bracket (1), three clamping arms (3) being rotatably connected between the bracket (1) and the self-centering component (2), a hole being opened on the bracket (1), the clamping arms (3) being distributed in a circumferential array along the edge of the hole, the self-centering component (2) being used to drive the three clamping arms (3) to synchronously move toward or away from the center of the hole, and a driving device being provided on the bracket (1), the driving device being used to drive the self-centering component (2) to rotate.

2. The automatic centering steady rest for CNC machine tools according to claim 1, characterized in that: The self-centering assembly (2) comprises a support ring (201) fixedly connected to the bracket (1), a synchronization ring (202) rotatably connected to the support ring (201), a guide groove (203) provided on the synchronization ring (202), and a pin (301) cooperating with the guide groove (203) provided on the clamping arm (3).

3. The automatic centering steady rest for CNC machine tools according to claim 2, characterized in that: The driving device comprises a hydraulic cylinder (4) arranged on a bracket (1), and an output end of the hydraulic cylinder (4) is hinged to a synchronization ring (202).

4. The automatic centering steady rest for CNC machine tools according to claim 2, characterized in that: The clamping arm (3) has an arc-shaped structure, and avoidance grooves (204) are provided at positions corresponding to the clamping arm (3) on the support ring (201) and the synchronization ring (202).

5. The automatic centering steady rest for CNC machine tools according to claim 4, characterized in that: A roller (302) is rotatably provided at one end of the clamping arm (3).

6. The automatic centering steady rest for CNC machine tools according to claim 5, characterized in that: The bracket (1) and the support ring (201) are both provided with accommodating grooves (205) at positions corresponding to the rollers (302).

7. The automatic centering steady rest for CNC machine tools according to claim 1, characterized in that: A notch (101) corresponding to the machine tool guide rail is provided at the bottom of the bracket (1), and a bottom plate (103) is connected to the bottom of the bracket (1) via bolts (102).

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