Anti-eccentricity chuck jig

Abstract

The utility model relates to the technical field of clamps, in particular to an anti-eccentricity chuck jig which comprises a chuck seat, the chuck seat comprises an installation column at one end, an installation hole axially penetrating through the chuck seat is formed in the end face of the installation column, and a clamping sleeve integrally in a barrel shape is arranged in the installation hole. The clamping sleeve comprises a clamping cylinder at the front end, the clamping cylinder is integrally of a frustum-shaped structure with the large outer end diameter and the small inner end diameter, and the mounting hole comprises a matching hole section which is integrally of a conical hole structure design at the outer end; a plurality of deformation openings which are designed in a long strip shape and arranged in the length direction of the clamping barrel are formed in the clamping barrel, the deformation openings are distributed in an array mode in the circumferential direction and penetrate through the wall thickness direction of the clamping barrel, the clamping barrel is divided into a plurality of clamping strips which are independently designed, and clamping blocks are integrally formed on the inner side faces of the outer ends of the clamping strips respectively. The utility model has the characteristics that the structural design is simpler and more reasonable, the workpiece clamping precision can be improved, and the structural size design is more compact and more reasonable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture, particularly to a eccentricity-preventing chuck fixture. BACKGROUND

[0002] In machining, the clamping and turning of rod-shaped workpieces is the most common. When turning rod-shaped workpieces, the workpieces are clamped by a chuck fixture and rotated by the machine tool to complete the turning. One of the important factors affecting the turning accuracy in lathe turning is the clamping accuracy of the chuck fixture.

[0003] In the prior art, a three-jaw chuck is usually used to clamp and machine rod-shaped workpieces. However, the three-jaw chuck has the following disadvantages: 1. The clamping force area of the three-jaw chuck is small, which makes the outer surface of the rod-shaped workpiece prone to damage; 2. The clamping accuracy of the three-jaw chuck is poor, and the clamping progress of the workpiece cannot be guaranteed when the workpiece on the three-jaw chuck is rotated by the machine tool; 3. The overall size and weight of the three-jaw chuck are large.

[0004] Therefore, how to provide an eccentricity-preventing chuck fixture with a simpler and more reasonable structure design, improved workpiece clamping accuracy, and a more compact and reasonable structure size design has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is how to provide an eccentricity-preventing chuck fixture with a simpler and more reasonable structure design, improved workpiece clamping accuracy, and a more compact and reasonable structure size design.

[0006] To achieve the above-mentioned purpose, the utility model provides an eccentricity-preventing chuck fixture, which comprises a chuck seat, the chuck seat comprises a mounting column at one end, an installation hole penetrating the chuck seat in the axial direction is arranged on the end face of the mounting column, a sleeve in the overall cylindrical shape is arranged in the installation hole; characterized in that: the sleeve comprises a clamping cylinder at the front end, the clamping cylinder is in the overall conical structure with a large outer diameter and a small inner diameter, the installation hole comprises a design cooperation hole section in the overall conical hole structure at the outer end; a strip-shaped deformation port is arranged on the clamping cylinder and arranged along the length direction of the clamping cylinder, the deformation port is a plurality of ports arranged in an array along the circumferential direction and penetrating the wall thickness direction of the clamping cylinder, and the clamping cylinder is divided into a plurality of clamping strips arranged independently, and a clamping block is integrally formed on the outer end inner side face of each clamping strip; the inner side face of the clamping block is in the arc surface structure; and after the clamping cylinder moves axially inward in the installation hole, the clamping strips can be folded inward, and the inner side faces of the clamping blocks are respectively supported on the outer circumferential surface of the workpiece and clamp the workpiece.

[0007] Thus, when the eccentricity-preventing chucking jig is used to clamp a rod-shaped workpiece, the workpiece is inserted into the outer end of the clamping cylinder, and then the clamping cylinder is moved axially inward in the mounting hole. The tapered surface between the outer peripheral surface of the clamping cylinder and the inner peripheral surface of the mounting hole causes the clamping strips to fold inward, and the inner side surfaces of the clamping blocks are supported on the outer peripheral surface of the workpiece and clamp the workpiece. In the above structure, the clamping of the workpiece is controlled by controlling the movement of the clamping cylinder in the mounting hole. The force exerted by the clamping blocks at the outer end of the clamping strips on the workpiece is more uniform, which improves the clamping accuracy and better protects the quality of the outer peripheral surface of the workpiece. In addition, the entire structure has a smaller radial size and is more compact.

[0008] As an optimization, the chuck holder further includes a mounting disc at the other end, the mounting disc is provided with a mounting and fixing structure and is used to be connected with the main shaft of the lathe; the mounting column is integrally formed in the middle of the side surface of the mounting disc; and the mounting hole is axially arranged through the mounting disc.

[0009] In this way, the structural design of the chuck holder is more simple and reasonable, and the mounting and fixing on the main shaft of the machine tool can be more convenient.

[0010] As an optimization, the mounting and fixing structure includes a plurality of mounting and fixing holes arranged in an array on the mounting disc in the circumferential direction.

[0011] In this way, the mounting and fixing structure is designed to be more simple and reasonable, and more convenient to disassemble and assemble.

[0012] Further, the mounting and fixing holes are six.

[0013] As an optimization, the clamping sleeve further includes a connecting cylinder at the rear end, the connecting cylinder is provided with a connecting structure and is used to be connected with the pull rod on the machine tool and inserted into the mounting hole from the rear end; the connecting structure includes a connecting thread arranged on the inner peripheral surface of the connecting cylinder.

[0014] In this way, the structural design of the clamping sleeve is more simple and reasonable, and the connecting cylinder can be more conveniently connected with the pull rod on the machine tool inserted into the mounting hole from the rear end.

[0015] As an optimization, the clamping cylinder includes a clamping sleeve front section at the outer end and a clamping sleeve rear section at the rear end, the clamping sleeve front section is designed as a frustum structure as a whole, and the clamping sleeve rear section is designed as a cylindrical structure as a whole; the diameter of the connecting cylinder is greater than the diameter of the clamping sleeve rear section; and the connecting cylinder, the clamping sleeve rear section and the clamping sleeve front section are integrally formed.

[0016] In this way, the structural design of the entire clamping cylinder is more simple and reasonable, and the machining and manufacturing can be more convenient.

[0017] Further, through holes are arranged on the clamping sleeve rear section and correspond to the rear ends of the deformation openings respectively, and the rear ends of the deformation openings are in communication with the through holes.

[0018] As optimization, the outer end of the clamping cylinder is provided with an inverted bevel structure; the outer end of the clamping block is provided with an inverted round corner structure; and the deformation port is six.

[0019] In this way, the structural design among the components is more reasonable, the assembly is more convenient, and the clamping of the workpiece is also more convenient.

[0020] As optimization, the anti-rotation sleeve is integrally designed in a circular box structure and is open at one end, the open end of the anti-rotation sleeve is sleeved on the front end of the mounting column, a connecting limiting structure is arranged between the anti-rotation sleeve and the mounting column to prevent the anti-rotation sleeve from being pulled out of the front end of the mounting column, a gap opening is arranged on the outer end of the anti-rotation sleeve to allow the front end of the clamping cylinder to extend to the outside, and an anti-rotation positioning structure is arranged on the anti-rotation sleeve, which has an anti-rotation positioning end and is connected with the clamping cylinder to limit the rotation of the clamping cylinder in the mounting hole.

[0021] In this way, by designing the anti-rotation sleeve, the rotation of the clamping cylinder in the mounting hole can be better limited, and the clamping reliability of the clamping cylinder on the workpiece is improved.

[0022] As optimization, the connecting limiting structure includes a circle of positioning grooves arranged on the outer peripheral surface of the outer end of the mounting column, and a plurality of positioning screw holes are arranged on the outer peripheral surface of the anti-rotation sleeve and are respectively used for installing positioning screws, and the inner ends of the positioning screws can be abutted and matched on the bottom surface of the positioning groove.

[0023] In this way, the connecting limiting structure between the anti-rotation sleeve and the mounting column is more simple and reasonable, and can be more conveniently disassembled.

[0024] As optimization, the anti-rotation positioning structure includes a positioning protrusion arranged on the inner peripheral surface of the gap opening of the anti-rotation sleeve, and an anti-rotation groove is arranged on the outer side surface of one of the clamping strips along the length direction of the clamping strip, and the positioning protrusion is arranged in the anti-rotation groove in a matched mode.

[0025] In this way, the anti-rotation positioning structure is more simple and reasonable.

[0026] In summary, the eccentricity-preventing chuck jig has the characteristics of simple and reasonable structure design, improved workpiece clamping precision, and compact and reasonable structure size. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of the eccentricity-preventing chuck jig in the specific embodiment of the utility model.

[0028] Figure 2 is Figure 1 a front view.

[0029] Figure 3 is Figure 1 a right view.

[0030] Figure 4 is Figure 1 a left view.

[0031] Figure 5 is Figure 4 an A-A sectional view.

[0032] Figure 6 is Figure 1 a structural schematic diagram without the anti-rotation sleeve.

[0033] Figure 7 is Figure 1 a structural schematic diagram of the clamping cylinder in the anti-rotation chuck. DETAILED DESCRIPTION

[0034] The utility model will be further described below in combination with the drawings and embodiments. It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular way, and therefore cannot be understood as limiting the utility model. The terms "first", "second", "third" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] As Figures 1 to 7 shown, an anti-eccentric chuck jig comprises a chuck seat 1, the chuck seat comprises a mounting column 2 at one end, an installation hole 3 is arranged axially through the chuck seat at the end face of the mounting column, a clamping sleeve 4 in the form of a cylinder as a whole is arranged in the installation hole; the clamping sleeve comprises a clamping cylinder 5 at the front end, the clamping cylinder is in the form of a truncated cone structure with a large outer end diameter and a small inner end diameter as a whole, the installation hole comprises a design cooperation hole section in the form of a tapered hole at the outer end; a deformation port 6 in the form of a long strip is arranged on the clamping cylinder and arranged along the length direction of the clamping cylinder, the deformation port is in the form of a plurality of arrayed distribution along the circumferential direction and arranged through the wall thickness direction of the clamping cylinder, and the clamping cylinder is divided into a plurality of independently designed clamping strips 7, the outer end inner side surface of each clamping strip is integrally formed with a clamping block 8; the inner side surface of the clamping block is in the form of an arc surface structure design; and after the clamping cylinder moves axially inward in the installation hole, the clamping strips can be folded inward, and the inner side surfaces of the clamping blocks are respectively attached to and supported on the outer peripheral surface of the workpiece and clamp the workpiece.

[0036] Thus, when the eccentricity-preventing chucking jig is used to clamp the rod-shaped workpiece, the workpiece is inserted into the outer end of the clamping cylinder, and then the clamping cylinder is axially moved inward in the mounting hole. The tapered surface between the outer peripheral surface of the clamping cylinder and the inner peripheral surface of the mounting hole causes the clamping strips to fold inward, and the inner side surfaces of the clamping blocks are supported on the outer peripheral surface of the workpiece and clamp the workpiece. In the above structure, the clamping of the workpiece is controlled by controlling the movement of the clamping cylinder in the mounting hole. The force of the clamping blocks at the outer end of the clamping strips on the workpiece is more uniform, which improves the clamping accuracy and better protects the quality of the outer peripheral surface of the workpiece. In addition, the entire structure has a smaller radial size and is more compact.

[0037] Further, the mounting hole includes the matching hole section at the front end, a linking hole section 9 at the middle part, and a through hole section 10 at the rear end, and the diameter of the through hole section is smaller than that of the linking hole section.

[0038] In the specific embodiment, the chuck holder further includes a mounting disc 11 at the other end, the mounting disc is provided with a mounting and fixing structure and is used to be connected with the main shaft of the lathe, the mounting column is integrally formed on the middle part of the side surface of the mounting disc, and the mounting hole is axially arranged through the mounting disc.

[0039] In this way, the structure of the chuck holder is more simple and reasonable, and the mounting and fixing on the main shaft of the machine tool are more convenient.

[0040] In the specific embodiment, the mounting and fixing structure includes a plurality of mounting and fixing holes 12 arranged in an array on the mounting disc in the circumferential direction.

[0041] In this way, the mounting and fixing structure is more simple and reasonable, and the dismounting and mounting are more convenient.

[0042] Further, the mounting and fixing holes are six.

[0043] In the specific embodiment, the clamping sleeve further includes a connecting cylinder 13 at the rear end, the connecting cylinder is provided with a connecting structure and is used to be connected with the pull rod of the machine tool which is inserted into the rear end of the mounting hole, and the connecting structure includes a connecting thread arranged on the inner peripheral surface of the connecting cylinder.

[0044] In this way, the structure of the clamping sleeve is more simple and reasonable, and the connecting cylinder can be more conveniently connected with the pull rod of the machine tool which is inserted into the rear end of the mounting hole.

[0045] In the specific embodiment, the clamping cylinder includes a clamping sleeve front section 14 at the outer end and a clamping sleeve rear section 15 at the rear end, the clamping sleeve front section is designed in a frustoconical structure as a whole, the clamping sleeve rear section is designed in a cylindrical structure as a whole, the diameter of the connecting cylinder is larger than that of the clamping sleeve rear section, and the connecting cylinder, the clamping sleeve rear section, and the clamping sleeve front section are integrally formed.

[0046] In this way, the structure of the whole clamping cylinder is more simple and reasonable, and the clamping cylinder can be more conveniently manufactured.

[0047] Further, a through hole 16 is arranged on the rear section of the clamping sleeve and corresponds to the rear end of the deformation port, and the rear end of the deformation port is arranged in communication with the through hole.

[0048] In the embodiment, the outer end of the clamping cylinder is provided with an inverted bevel structure, the outer end of the clamping block is provided with an inverted rounded corner structure, and the deformation port is six.

[0049] In this way, the structure design among the components is more reasonable, the assembly is more convenient, and the clamping of the workpiece is also more convenient.

[0050] In the embodiment, the anti-rotation sleeve 17 is designed in a whole circular box structure and is open at one end, the open end of the anti-rotation sleeve is sleeved on the front end of the mounting column, a connecting limiting structure is arranged between the anti-rotation sleeve and the mounting column to prevent the anti-rotation sleeve from being pulled out of the front end of the mounting column, a gap opening 18 is arranged on the outer end of the anti-rotation sleeve to allow the front end of the clamping cylinder to extend to the outside, and an anti-rotation positioning structure is arranged on the anti-rotation sleeve, which has an anti-rotation positioning end and is connected with the clamping cylinder to limit the rotation of the clamping cylinder in the mounting hole.

[0051] In this way, by designing the anti-rotation sleeve, the rotation of the clamping cylinder in the mounting hole can be better limited, and the clamping reliability of the clamping cylinder on the workpiece is improved.

[0052] In the embodiment, the connecting limiting structure includes a circle of positioning grooves 19 arranged on the outer circumferential surface of the outer end of the mounting column, a plurality of positioning screw holes 20 are arranged on the inner circumferential surface of the gap opening of the anti-rotation sleeve and are each used for installing a positioning screw, and the inner end of the positioning screw can be abutted and matched on the bottom surface of the positioning groove.

[0053] In this way, the connecting limiting structure between the anti-rotation sleeve and the mounting column is more simple and reasonable, and can be more conveniently disassembled.

[0054] In the embodiment, the anti-rotation positioning structure includes a positioning protrusion 21 arranged on the inner circumferential surface of the gap opening of the anti-rotation sleeve, and an anti-rotation groove 22 is arranged on the outer side surface of one of the clamping strips along the length direction of the clamping strip, and the positioning protrusion is arranged in the anti-rotation groove in a matched manner.

[0055] In this way, the anti-rotation positioning structure is more simple and reasonable.

[0056] In summary, the eccentricity-preventing chuck jig has the characteristics of simple and reasonable structure design, improved workpiece clamping precision, and compact and reasonable structure size design.

[0057] The preferred embodiments of the present application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the existing technology within the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. An eccentricity-preventing collet jig comprising a collet holder, the collet holder comprising a mounting post at one end, the mounting post having an axial mounting hole formed therethrough, the mounting hole having a collet sleeve disposed therein, the collet sleeve being generally cylindrical in shape; characterized in that ； The clamping sleeve comprises a clamping cylinder at the front end, which is in a whole conical frustum structure with a large outer diameter and a small inner diameter, and the mounting hole comprises a whole conical hole structure design cooperation hole section at the outer end; a long strip design deformation port is arranged on the clamping cylinder along the length direction of the clamping cylinder, the deformation port is a plurality of array distribution in the circumferential direction and is arranged through the wall thickness direction of the clamping cylinder, and the clamping cylinder is divided into a plurality of independent clamping strips, and the outer end inner side of each clamping strip is integrally formed with a clamping block; the inner side of the clamping block is in an arc surface structure design; and after the clamping cylinder moves axially inward in the mounting hole, the clamping strips can be folded inward, and the inner sides of the clamping blocks are respectively supported on the outer circumferential surface of the workpiece and clamp the workpiece.

2. The anti-eccentric chuck according to claim 1, wherein: The chuck seat further comprises a mounting disc at the other end, the mounting disc is provided with a mounting and fixing structure and is used for being connected with the lathe main shaft; the mounting column is integrally formed on the middle of the side surface of the mounting disc; and the mounting hole is arranged axially through the mounting disc.

3. The anti-eccentric chuck according to claim 2, wherein: The mounting and fixing structure comprises a plurality of mounting and fixing holes arranged in an array on the mounting disc in the circumferential direction.

4. The anti-eccentric chuck according to claim 1, wherein: The clamping sleeve further comprises a connecting cylinder at the rear end, the connecting cylinder is provided with a connecting structure and is used for being connected with the pull rod on the machine tool and extending into the mounting hole from the rear end; the connecting structure comprises a connecting thread arranged on the inner circumferential surface of the connecting cylinder.

5. The anti-eccentric chuck according to claim 4, wherein: The clamping cylinder comprises a clamping sleeve front section at the outer end and a clamping sleeve rear section at the rear end, the clamping sleeve front section is in a whole conical frustum structure design, the clamping sleeve rear section is in a whole cylindrical structure design; and the diameter of the connecting cylinder is greater than that of the clamping sleeve rear section; the connecting cylinder, the clamping sleeve rear section and the clamping sleeve front section are integrally formed.

6. The anti-eccentric chuck according to claim 1, wherein: The outer end of the clamping cylinder is provided with an inverted bevel structure; the outer end of the clamping block is provided with an inverted rounded corner structure; and the deformation port is six.

7. The anti-eccentric chuck according to claim 1, wherein: Further comprising a rotation prevention sleeve in a whole circular box body structure design and in an open design at one end, the rotation prevention sleeve is sleeved at the front end of the mounting column, and a connecting and limiting structure is arranged between the rotation prevention sleeve and the mounting column to prevent the rotation prevention sleeve from being pulled out from the front end of the mounting column; a gap opening is arranged at the outer end of the rotation prevention sleeve to allow the front end of the clamping cylinder to extend to the outside; and a rotation prevention positioning structure is arranged on the rotation prevention sleeve, the rotation prevention positioning structure has a rotation prevention positioning end and is connected with the clamping cylinder to limit the rotation of the clamping cylinder in the mounting cylinder.

8. The anti-eccentric chuck according to claim 7, wherein: The connecting and limiting structure comprises a positioning groove arranged on the outer circumferential surface of the outer end of the mounting column, a plurality of positioning screw holes are arranged on the outer circumferential surface of the rotation prevention sleeve and are respectively used for mounting and arranging a positioning screw, and the inner end of the positioning screw can abut and cooperate with the bottom surface of the positioning groove.

9. The anti-eccentric chuck according to claim 7, wherein: The rotation prevention positioning structure comprises a positioning protrusion arranged on the inner circumferential surface of the gap opening of the rotation prevention sleeve, and a rotation prevention groove is arranged on the outer side surface of one of the clamping strips along the length direction thereof, and the positioning protrusion is arranged in the rotation prevention groove.

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