Internal expansion type tool for CNC machining center

Abstract

The utility model provides an internal expansion type tool for a CNC machining center, and belongs to the technical field of CNC machining. Comprising a tool base arranged on a machining center body, an expansion sleeve is arranged on the tool base, a pull rod is arranged in the expansion sleeve, and the end, away from the machining center body, of the pull rod is integrally connected with an expansion block matched with the expansion sleeve. The clamping wheel is arranged on the outer side of the tool base, when the workpiece is installed on the mechanical arm, the workpiece is installed on the expansion sleeve, the workpiece is simply clamped through the clamping wheel, the workpiece is prevented from rotating, and after the expansion sleeve expands to fix the workpiece, the clamping wheel is loosened, so that the workpiece is installed on the clamping wheel. And after the workpiece is machined, the clamping wheel is also adopted to simply clamp the workpiece in the alternating process of the tool and the manipulator, and the effect of improving the automatic machining precision of the workpiece is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC numerical control machining, in particular to an internal expansion tooling for a numerical control CNC machining center. Background Art

[0002] Generally, CNC machining refers to computer digital controlled precision machining, CNC machining lathes, CNC machining milling machines, CNC machining boring and milling machines, etc. CNC machining center is an automated machining equipment that integrates automatic machining and automatic tool changing.

[0003] The common internal expansion tooling uses the force of axial pullback, the pullback of the tapered surface, and the deformation of the expansion sleeve to achieve the clamping and loosening of the workpiece. In the automated production process, the workpiece is completely moved and transferred by the robot. When the CNC automatically clamps and processes the workpiece, the robot clamps the workpiece on the expansion sleeve. The tooling needs to expand the workpiece after the robot leaves.

[0004] However, in the process from when the robot releases the workpiece to when it clamps the workpiece, the workpiece is easily affected by gravity and the friction between the robot and the workpiece during the relaxation process, causing the workpiece to deflect. After the workpiece deflects, it affects the subsequent positioning processing and positioning installation of the workpiece during the automated processing process. Utility Model Content

[0005] In view of the above problems, the utility model provides an internal expansion tooling for a CNC machining center.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is as follows:

[0007] Provided is an internal expansion tooling for a numerical control (CNC) machining center, comprising a tooling seat arranged on a main body of the machining center, an expansion sleeve being arranged on the tooling seat, a pull rod being arranged in the expansion sleeve, an expansion block cooperating with the expansion sleeve being integrally connected to one end of the pull rod away from the main body of the machining center, and a pre-clamping component comprising a plurality of clamping wheels arranged at intervals along the circumference of the expansion sleeve, the clamping wheels being used for elastically contacting the outer wall of a workpiece.

[0008] Furthermore, a connecting frame is provided at the edge of the tooling seat, and the connecting frame includes a connecting rod, the axis of the connecting rod is perpendicular and intersecting with the axis of the expansion and contraction sleeve, and both ends of the connecting rod are rotatably connected to clamping wheels, and a rubber layer is provided on the outside of the clamping wheel.

[0009] Furthermore, connecting blocks are hinged at both ends of the connecting rod, the clamping wheel is rotatably mounted on the connecting block, and the connecting rod is provided with a torsion spring for driving the connecting block to rotate and making the rotating axis of the clamping wheel parallel to the axis of the connecting rod.

[0010] Furthermore, one end of the connecting frame close to the tooling seat is hinged to the tooling seat, and also includes a driving assembly for driving the multiple connecting frames to rotate synchronously.

[0011] Furthermore, the driving assembly includes a driving frame and multiple connecting rods, the connecting rods are connected to the tooling seat by radial sliding along the expansion and contraction sleeve, the connecting rods are slid and rotatably connected to the connecting frame at one end close to the connecting frame, the driving frame is coaxially sleeved on the outside of the tooling seat, and multiple guide rails are arranged on the driving frame, the connecting rods are connected to the guide rails by sliding along the length direction of the guide rails at one end away from the tooling seat, the multiple guide rails form a bucket-shaped guide rail group, the end of the guide rail group away from the machining center body is a larger opening, and also includes a driving cylinder, which is used to drive the driving frame to slide axially along the expansion and contraction sleeve.

[0012] Furthermore, both ends of the linkage rod are rotatably connected with rollers, and the rollers are rollingly connected to the guide rail / connecting frame.

[0013] The beneficial effects of the utility model are as follows: by arranging a clamping wheel on the outer side of the tooling seat, when the manipulator installs the workpiece, the workpiece is installed on the expansion and contraction sleeve, and the workpiece is simply clamped by the clamping wheel to prevent the workpiece from rotating. After the workpiece is fixed by the expansion and contraction sleeve, the clamping wheel is relaxed. After the workpiece is processed, the clamping wheel is also used to simply clamp the workpiece in the alternation process between the tooling and the manipulator, which effectively prevents the workpiece from deflecting during the automatic processing of the workpiece and improves the automatic processing accuracy of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the internal expansion tooling in the clamping state of an embodiment of the present application.

[0015] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A.

[0016] Figure 3 This is a schematic diagram of the overall structure of the internal expansion tooling in a relaxed state according to an embodiment of the present application.

[0017] Among them, 11, tooling seat; 12, expansion and contraction sleeve; 13, pull rod; 2, clamping wheel; 3, connecting frame; 31, connecting rod; 32, connecting block; 33, torsion spring; 34, roller; 35, slide groove; 4, connecting rod; 5, driving frame; 51, guide rail; 52, driving cylinder. DETAILED DESCRIPTION

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The present application embodiment discloses an internal expansion tooling for a CNC machining center, referring to Figure 1 and Figure 2, including a tooling seat 11 installed on the main body of the machining center, a through hole is coaxially opened on the tooling seat 11, an expansion sleeve 12 is movably arranged on the side of the tooling seat 11 away from the main body of the machining center, a channel coaxial with the through hole is penetrated through the expansion sleeve 12, a pull rod 13 is passed through the channel of the expansion sleeve 12, one end of the pull rod 13 close to the main body of the machining center is connected to the main body of the machining center, and the other end is connected to an expansion block, the expansion block is conical, and cooperates with the channel of the expansion sleeve 12 away from the tooling seat 11.

[0020] When the manipulator installs the workpiece on the expansion and contraction sleeve 12, the workpiece is clamped between the multiple clamping wheels 2 for elastic clamping, which can pre-position the workpiece, prevent the workpiece from rotating before being fixed by internal expansion, and improve the accuracy of continuous processing of the workpiece.

[0021] Around the tooling seat 11, there is a pre-clamping assembly for clamping the workpiece on the expansion and contraction sleeve 12. Specifically, the pre-clamping assembly includes a plurality of clamping wheels 2 arranged at intervals along the circumference of the tooling seat 11. The clamping wheels 2 are used to elastically contact the outer wall of the workpiece. The outer ring of the clamping wheel 2 is a rubber layer made of rubber material. A connecting frame 3 is fixed around the tooling seat 11. The connecting frame 3 is T-shaped. One end of the connecting frame 3 is connected to the tooling seat 11. The end of the connecting frame 3 away from the connection is a connecting rod 31. The axis of the connecting rod 31 is perpendicular and staggered with the axis of the expansion and contraction sleeve 12 in space. The two ends of the connecting rod 31 are connected to the clamping wheels 2.

[0022] Furthermore, connecting blocks 32 are hinged at both ends of the connecting rod 31, and the gears at both ends of the connecting rod 31 are respectively rotatably connected to the two connecting blocks 32. The connecting rod 31 is provided with a limit groove, which is used to limit the axis of the clamping wheel 2 on the two connecting blocks 32 to be parallel to the axis of the connecting rod 31, and can limit the two clamping wheels 2 from rotating away from the side close to the expansion and contraction sleeve 12 during the rotation of the two connecting blocks 32. Torsion springs 33 are provided at both ends of the connecting rod 31, one end of the torsion spring 33 is connected to the connecting block 32, and the other end is connected to the connecting rod 31, which is used to drive the connecting block 32 to rotate until the axis of the clamping wheel 2 is parallel to the axis of the connecting rod 31.

[0023] Among them, when the clamping wheel 2 clamps the workpiece, the two clamping wheels 2 are squeezed and deflected, so that the side of the clamping wheel 2 contacts the workpiece, increasing the contact area with the workpiece. At the same time, the two clamping wheels 2 flip towards each other to increase the friction force on the workpiece in the circumferential direction and improve the clamping stability of the workpiece.

[0024] Reference Figure 3Furthermore, one end of the connecting frame 3 close to the tooling seat 11 is hinged to the tooling seat 11, and also includes a driving assembly for driving the multiple connecting frames 3 to rotate synchronously. After the expansion sleeve 12 expands and fixes the workpiece in an internal expansion manner, the connecting frame 3 is driven to rotate synchronously to rotate the clamping wheel 2 away from the outside of the workpiece, so that the machining tool can process the outer wall of the workpiece conveniently. After the machining is completed, the multiple clamping wheels 2 are driven to clamp the workpiece.

[0025] Specifically, the driving assembly includes a driving frame 5 and multiple connecting rods 4. The connecting rod 4 is connected to the tooling seat 11 by radial sliding along the expansion and contraction sleeve 12. The connecting rod 4 is connected to the connecting frame 3 at one end by sliding and rotation. The driving frame 5 is coaxially sleeved on the outside of the tooling seat 11. Multiple guide rails 51 are provided on the driving frame 5. The end of the connecting rod 4 away from the tooling seat 11 is connected to the guide rail 51 by sliding along the length direction of the guide rail 51. The multiple guide rails 51 form a bucket-shaped guide rail 51 group. The end of the guide rail 51 group away from the main body of the machining center is a larger opening. The driving cylinder 52 is also included. The driving cylinder 52 is used to drive the driving frame 5 to slide axially along the expansion and contraction sleeve 12.

[0026] Furthermore, both ends of the connecting rod 4 are rotatably connected with rollers 34, and a slide groove 35 is opened on the connecting frame 3. The connecting rod 4 extends into the slide groove 35, and the roller 34 of the connecting rod 4 close to the connecting frame 3 rolls in contact with the slide groove 35, and the other end of the connecting rod 4 rises to the guide rail 51, and the roller 34 of the connecting rod 4 close to the guide rail 51 rolls in contact with the guide rail 51.

[0027] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An internal expansion tool for a CNC machining center, comprising a tool seat (11) arranged on a main body of the machining center, an expansion sleeve (12) being arranged on the tool seat (11), a pull rod (13) being arranged inside the expansion sleeve (12), an expansion block cooperating with the expansion sleeve (12) being integrally connected to one end of the pull rod (13) away from the main body of the machining center, characterized in that: It also comprises a pre-clamping assembly, which comprises a plurality of clamping wheels (2) arranged at intervals along the circumference of the expansion and contraction sleeve (12), and the clamping wheels (2) are used to elastically contact the outer wall of the workpiece.

2. The internal expansion tooling for a CNC machining center according to claim 1, characterized in that: A connecting frame (3) is arranged at the edge of the tooling seat (11), and the connecting frame (3) comprises a connecting rod (31). The axis of the connecting rod (31) is perpendicular and intersecting with the axis of the expansion and contraction sleeve (12). Both ends of the connecting rod (31) are rotatably connected to clamping wheels (2), and the outside of the clamping wheel (2) is provided with a rubber layer.

3. The internal expansion tooling for a CNC machining center according to claim 2, characterized in that: The two ends of the connecting rod (31) are hinged with connecting blocks (32), the clamping wheel (2) is rotatably mounted on the connecting block (32), and the connecting rod (31) is provided with a torsion spring (33) for driving the connecting block (32) to rotate and making the rotation axis of the clamping wheel (2) parallel to the axis of the connecting rod (31).

4. The internal expansion tooling for a CNC machining center according to claim 2, characterized in that: One end of the connecting frame (3) close to the tooling seat (11) is hinged to the tooling seat (11), and also includes a driving component for driving the multiple connecting frames (3) to rotate synchronously.

5. The internal expansion tooling for a CNC machining center according to claim 4, characterized in that: The driving assembly comprises a driving frame (5) and a plurality of connecting rods (4), wherein the connecting rod (4) is connected to the tooling seat (11) by radial sliding along the expansion and contraction sleeve (12), and the end of the connecting rod (4) close to the connecting frame (3) is connected to the connecting frame (3) by sliding and rotation, and the driving frame (5) is coaxially sleeved on the outside of the tooling seat (11), and a plurality of guide rails (51) are arranged on the driving frame (5), and the end of the connecting rod (4) away from the tooling seat (11) is connected to the guide rail (51) by sliding along the length direction of the guide rail (51), and the plurality of guide rails (51) form a bucket-shaped guide rail (51) group, and the end of the guide rail (51) group away from the machining center body is a larger opening, and further comprises a driving cylinder (52), and the driving cylinder (52) is used to drive the driving frame (5) to slide axially along the expansion and contraction sleeve (12).

6. The internal expansion tooling for a CNC machining center according to claim 5, characterized in that: Both ends of the linkage rod (4) are rotatably connected to rollers (34), and the rollers (34) are rollingly connected to the guide rail (51) / connecting frame (3).

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