A clamping mechanism for a CNC tube blank automatic chamfering machine

Abstract

The present invention relates to the field of metal cutting machine tools, and discloses a clamping mechanism for a CNC tube blank automatic chamfering machine, comprising a hollow spindle, wherein a fixed seat, a telescopic seat, a convex support bowl, a concave support seat and a spherical centering block are arranged in the hollow spindle, wherein the spherical centering block is limited in a support box, wherein the support box is mounted on the convex support bowl, wherein the convex support bowl and the concave support seat are spherically matched, wherein a bearing is installed between the concave support seat and the telescopic seat, wherein the telescopic seat is arranged in the fixed seat and can slide axially along the fixed seat, and wherein the telescopic seat is connected to the oil cylinder piston. The clamping mechanism of the present invention can eliminate the manual tool setting link when the position of the incoming material positioning surface is fixed, thereby realizing the CNC of the entire process of chamfering the blank, greatly improving the production efficiency of the blank chamfering, and reducing the amount of manual labor; the auxiliary support structure on the left side provides auxiliary support for the blank, thereby avoiding the tail swinging phenomenon during rotation, improving the clamping stability of the tube blank, and improving the cutting conditions.

Description

Technical Field

[0001] The invention relates to the field of metal cutting machine tools, and in particular to a clamping mechanism of a numerically controlled tube blank automatic chamfering machine. Background Art

[0002] In the extrusion production of stainless steel pipes, chamfering of tube blanks is an essential processing step in the billet making process. At present, major domestic manufacturers all use manual end chamfering on lathes. The chamfering method is to position and clamp the left end of the tube blank with the lathe chuck, manually align the tool at the right end of the tube blank, and then manually or CNC turn the right end of the tube blank for chamfering. Since the lengths of incoming tube blanks vary, this method of clamping the left end and positioning the right end for cutting requires tool alignment before each chamfering. At the same time, for chamfering of longer tube blanks, a center frame is required for auxiliary support, otherwise the cantilever of the blank is too long to be processed. The above processing method greatly affects the processing efficiency of tube blanks and increases the labor intensity of personnel. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a clamping mechanism for a CNC tube blank automatic chamfering machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A clamping mechanism of a CNC tube blank automatic chamfering machine comprises a hollow spindle, wherein a fixed seat, a telescopic seat, a convex support bowl, a concave support seat and a spherical centering block are arranged in the hollow spindle, wherein the spherical centering block is limited in a support box, and when an external force is applied, the spherical centering block can retreat in the support box, wherein the support box is mounted on the convex support bowl, and the convex support bowl is spherically matched with the concave support seat, so that the convex support bowl can rotate at a certain angle in all directions in the concave support seat, and a bearing is installed between the concave support seat and the telescopic seat, so that the concave support seat can rotate along the center line of the telescopic seat, wherein the telescopic seat is arranged in the fixed seat and can slide axially along the fixed seat, and the telescopic seat is connected to the oil cylinder piston.

[0006] Furthermore, a chuck is provided at the front end of the hollow main shaft.

[0007] Furthermore, the spherical centering block is located in the middle of the hollow main shaft.

[0008] Furthermore, the spherical centering block is tightened by a disc spring and is pressed by a pressure plate to be confined in the support box.

[0009] Furthermore, the support box is mounted on the convex support bowl by bolts.

[0010] Furthermore, the convex support bowl is spherically matched with the concave support seat under the limitation of an intermediate fastener.

[0011] Furthermore, the oil cylinder piston is connected to the fixing seat through a transition piece.

[0012] Furthermore, the mating portion between the telescopic seat and the fixed seat is designed to be a square structure so that the telescopic seat can only slide axially but not rotate in the fixed seat.

[0013] Furthermore, the hollow main shaft is mounted on the main shaft housing through a bearing.

[0014] Preferably, the intermediate fastener is a pressure plate with a spherical surface, and the pressure plate can press the convex support bowl into the concave support seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The clamping mechanism of the CNC tube blank automatic chamfering machine of the present invention can realize the clamping and positioning of the right end of the tube blank, and the left end is deeply inserted into the hollow main shaft, so that the positioning surface and the cutting surface are at the same end of the tube blank. When the position of the incoming material positioning surface is fixed, the manual tool setting link is eliminated, so that the whole process of chamfering the blank can be CNC controlled, which greatly improves the production efficiency of chamfering the blank and reduces the amount of manual labor;

[0017] (2) The clamping mechanism of the present invention has an auxiliary support structure composed of a telescopic seat on the left side that can be telescopic and movable according to the length of the blank, and can provide auxiliary support for the blank when the long material is chamfered, thereby avoiding the tail swinging phenomenon during rotation, improving the clamping stability of the tube blank, and improving the cutting conditions;

[0018] (3) The clamping mechanism of the present invention uses a ball joint structure to make the tail of the tube billet fit more closely with the auxiliary support device, which can eliminate the influence of the oblique cutting of the tube billet on the tail support;

[0019] (4) The clamping mechanism of the present invention can provide auxiliary radial positioning support for the center of the tube blank through the spherical centering block. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the clamping mechanism of the CNC tube blank automatic chamfering machine of the present invention;

[0022] Figure 2 for Figure 1 AA cross-section diagram;

[0023] Figure 3 It is a working schematic diagram of the clamping mechanism of the present invention;

[0024] In the figure: 1 spherical centering block, 2 support box, 3 convex support bowl, 4 bearing, 5 concave support seat, 6 telescopic seat, 7 cylinder piston, 8 fixed seat, 9 spindle box, 10 hollow spindle, 11 chuck, 12 pipe fittings. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0026] like Figures 1-2 As shown, a clamping mechanism of a CNC tube blank automatic chamfering machine comprises a hollow spindle 10, in which a fixed seat 8, a telescopic seat 6, a convex support bowl 3, a concave support seat 5 and a spherical centering block 1 are arranged, and the spherical centering block 1 is located in the middle of the hollow spindle, and the spherical centering block 1 is tightened by a disc spring and is pressed and limited in a support box 2 by a pressure plate, and when an external force is applied, the spherical centering block 1 can retreat in the support box 2, and the support box 2 is installed on the convex support bowl 3 by bolts, and the convex support bowl 3 is spherically matched with the concave support seat 5 under the limitation of an intermediate fastener, so that the convex support bowl 3 can rotate in the concave support seat 5 in all directions at a certain angle, and the rotation angle Approximately ±10°, the intermediate fastener is a pressure plate with a spherical surface, and the pressure plate can press the convex support bowl into the concave support seat; a bearing 4 is installed between the concave support seat 5 and the telescopic seat 6, so that the concave support seat 5 can rotate along the center line of the telescopic seat 6, and the telescopic seat 6 is arranged in the fixed seat 8. The matching part of the telescopic seat 6 and the fixed seat 8 is designed to be a square structure so that it can only slide axially but not rotate in the fixed seat 8. The telescopic seat 6 is connected to the cylinder piston 7, and the telescopic seat 6 and the cylinder piston 7 form a cylinder structure. The cylinder piston 7 is connected to the fixed seat 8 through a transition piece, and the transition piece is a seat. The seat is connected to the fixed seat through bolts, and the piston is connected to the seat through threads.

[0027] The hollow spindle 10 is mounted on the spindle housing 9 through a bearing (the spindle housing refers to a housing for mounting the hollow spindle, which is an existing housing), and a chuck 11 is provided at the front end of the hollow spindle 10 .

[0028] like Figure 3As shown, the implementation process of the clamping mechanism of the CNC tube blank automatic chamfering machine of the present invention is as follows: when loading, the tube blank 12 is clamped by the robot and fed axially from right to left into the hollow main shaft 10. The center hole of the left end of the tube blank 12 first contacts the spherical centering block 1. As the blank 12 is fed, the spherical centering block 1 is compressed and retreats until the left end face of the blank 12 contacts the convex support bowl 3. As the blank 12 continues to be fed, the convex support bowl 3 will rotate in the concave support seat 5 until the convex support bowl 3 is completely fitted with the left end face of the blank 12. The blank 12 continues to be fed, and at this time, the cylinder plug cavity composed of the telescopic seat 6 and the cylinder piston 7 begins to overflow, and the telescopic seat 6 retreats. When the right end of the blank 12 reaches the positioning surface, the robot stops feeding, and the chuck 11 clamps the tube blank 12. As the cutting begins, the hollow spindle 10 rotates, thereby driving the entire chuck 11, the blank 12, the convex support bowl 3 and the concave support seat 5 to rotate. During this process, there is a certain back pressure in the cylinder plug cavity of the telescopic seat 6, which can always stably support the left end face of the tube blank 12.

[0029] The components and structures not described in detail in the above embodiments are well-known components and common structures or common means in the industry and are not described one by one here.

[0030] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A clamping mechanism for a CNC tube blank automatic chamfering machine, characterized in that: It includes a hollow main shaft, a chuck is provided at the front end of the hollow main shaft, a fixed seat, a telescopic seat, a convex support bowl, a concave support seat and a spherical centering block are provided inside the hollow main shaft, the spherical centering block is limited in the support box, when an external force is applied, the spherical centering block can retreat in the support box, the support box is installed on the convex support bowl, the convex support bowl and the concave support seat are spherically matched, so that the convex support bowl can rotate at a certain angle in all directions in the concave support seat, a bearing is installed between the concave support seat and the telescopic seat, so that the concave support seat can rotate along the center line of the telescopic seat, the telescopic seat is arranged in the fixed seat and can slide axially along the fixed seat, and the telescopic seat is connected to the cylinder piston.

2. According to claim 1, the clamping mechanism of the CNC tube blank automatic chamfering machine is characterized in that: The spherical centering block is located in the middle of the hollow main shaft.

3. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The spherical centering block is tightened by a disc spring and is pressed by a pressure plate to be limited in the support box.

4. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The support box is mounted on the convex support bowl by bolts.

5. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The convex support bowl is spherically matched with the concave support seat under the limitation of an intermediate fastener.

6. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The oil cylinder piston is connected to the fixing seat through a transition piece.

7. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The matching portion between the telescopic seat and the fixed seat is designed to be a square structure so that the telescopic seat can only slide axially but not rotate in the fixed seat.

8. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 1 is characterized in that: The hollow main shaft is mounted on the main shaft housing through bearings.

9. The clamping mechanism of the CNC tube blank automatic chamfering machine according to claim 5 is characterized in that: The intermediate fastener is a pressing plate with a spherical surface, and the pressing plate can press the convex support bowl into the concave support seat.

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