Clamping tool for machining the end face of an elongate sleeve

Abstract

The application discloses a clamping tool for machining the end face of an elongated sleeve, which is used for fixing an elongated sleeve workpiece on a machine tool, and the machine tool is provided with a machine tool pipe and a workbench, the machine tool pipe is movably arranged on the workbench, and the clamping tool comprises a base, a mandrel, a lower clamping plate and an upper clamping plate which extend coaxially, the base is fixedly connected to the top of the workbench, a connecting disc capable of moving up and down is arranged in the base, the bottom end of the connecting disc is fixedly connected to the machine tool pipe, a plurality of pull rods are uniformly connected to the connecting disc in the circumferential direction, the mandrel extends in the vertical direction and is fixedly connected to the top of the base, the top of the mandrel is provided with a positioning structure, the upper clamping plate and the lower clamping plate are annular, the lower clamping plate is connected to the top of the base, the inner cavity of the lower clamping plate is matched with the lower part of the workpiece, the inner cavity of the upper clamping plate is matched with the upper part of the workpiece, the plurality of pull rods vertically penetrate through the upper clamping plate and are screwed with nuts at the upper part, the workpiece can be quickly and stably clamped and fixed, and the labor intensity is low.

Description

Technical Field

[0001] This utility model relates to the field of clamping fixture technology, and in particular to a clamping fixture for machining the end face of a slender sleeve. Background Technology

[0002] In the existing technology, when processing (such as turning) the end face of slender sleeve products, the outer cylindrical surface is usually clamped and fixed by a three-jaw chuck, and then positioned by the rear end face. The distance between the bottom surface of the inner cavity and the rear end face is controlled in the inner cavity of the blank to fix the blank product. However, since the inner cavity of the blank is a smooth arc surface structure, there is a defect of unstable control, which can easily lead to unstable wall thickness of the product end face, thus affecting the processing quality.

[0003] Another processing method involves positioning the inner cavity end face with an ejector pin and using an expansion device to tighten the inner hole for processing. However, when the inner cavity is spherical or the diameter of the opening is much smaller than the diameter of the inner cavity, the expansion structure cannot be used for clamping. In this case, a wrench needs to be used externally to tighten and press the device. During the tightening process, due to the uneven force surface, the workpiece is prone to tilting, resulting in inconsistent wall thickness of the rear end face. Furthermore, the work is labor-intensive and inefficient. Utility Model Content

[0004] This application provides a clamping fixture for machining the end face of slender sleeves, which can quickly and securely clamp and fix slender sleeve-type workpieces, reducing labor intensity and improving work efficiency.

[0005] This application provides a clamping fixture for machining the end face of a slender sleeve, used to fix a slender sleeve-like workpiece on a machine tool. The machine tool is equipped with a machine tool pull tube and a worktable. The machine tool pull tube is movably disposed within the worktable. The clamping fixture includes a base extending coaxially, a mandrel, a lower clamping plate, and an upper clamping plate. The base is fixedly connected to the top of the worktable. A connecting plate that can move up and down is provided inside the base. The bottom end of the connecting plate is fixedly connected to the machine tool pull tube. Multiple pull rods are evenly connected to the connecting plate circumferentially. The mandrel extends vertically and is fixedly connected to the top of the base. The top of the mandrel is provided with a positioning structure. The upper clamping plate and the lower clamping plate are both annular. The lower clamping plate is connected to the top of the base, and the inner cavity of the lower clamping plate is adapted to the lower part of the slender sleeve-like workpiece. The inner cavity of the upper clamping plate is adapted to the upper part of the slender sleeve-like workpiece. Multiple pull rods vertically penetrate the upper clamping plate and are screwed with nuts at the top.

[0006] In one possible implementation, the connecting disc has a T-shaped cross-section and includes a circular disc body and a first connecting shaft vertically connected to the center of the bottom of the circular disc body, wherein a plurality of the tie rods are vertically connected to the circular disc body, and wherein the first connecting shaft is threaded into the machine tool drawing tube.

[0007] In one possible implementation, the number of the pull rods is greater than or equal to 3.

[0008] In one possible implementation, the mandrel includes a mandrel body and a top block detachably connected to the top of the mandrel body, with the positioning structure located on top of the top block.

[0009] In one possible implementation, the top block includes a block body, a protrusion on the top of the block body, and a second connecting shaft on the bottom of the block body, wherein the second connecting shaft is threaded to the top end of the spindle body, and wherein the outer edge of the top of the block body is provided with an arc-shaped transition structure, the arc-shaped transition structure and the protrusion constitute the positioning structure.

[0010] In one possible implementation, the lower clamping plate is connected to the base circumferentially by a plurality of studs, with the head of the studs located above the lower clamping plate, and the shank of the studs being fitted with a spring, the spring being elastically connected between the lower clamping plate and the base.

[0011] In one possible implementation, the outer periphery of the lower clamping plate is provided with a clearance notch for avoiding the pull rod.

[0012] In one possible implementation, the upper clamping plate is provided with an arc-shaped channel along the circumference that cooperates with the pull rod, and a plurality of the arc-shaped channels are provided with a material release hole at one end in the same direction, the diameter of the material release hole being larger than the outer diameter of the nut.

[0013] Beneficial effects: Compared with the prior art, the clamping fixture provided in this application for machining the end face of slender sleeves is positioned in the inner cavity of the slender sleeve workpiece by means of a mandrel, and the slender sleeve workpiece is clamped and fixed on the outer periphery by means of the cooperation of the upper clamping plate and the lower clamping plate. It can quickly clamp and fix the slender sleeve workpiece on the worktable of the machine tool by means of hydraulic transmission through the machine tool tube, which has high work efficiency, low labor intensity and good clamping stability.

[0014] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of the clamping fixture used in this application for machining the end face of a slender sleeve is shown.

[0016] Figure 2 This diagram illustrates the structure of the clamping fixture used in this application for machining the end face of a slender sleeve when clamping the workpiece.

[0017] Figure 3 A top view schematic diagram of the clamping fixture used in this application for machining the end face of a slender sleeve is shown.

[0018] Figure 4 This application shows Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0019] Figure 5 This application shows Figure 4 A magnified structural diagram of part B. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] refer to Figures 1 to 5 This application provides a clamping fixture for machining the end face of a slender sleeve, used to fix a slender sleeve-like workpiece 11 on a machine tool. The fixture achieves hydraulic clamping and fixing of the slender sleeve-like workpiece 11 using the machine tool's own hydraulic mechanism. The machine tool includes a machine tool pull tube 12 and a worktable 13. The machine tool pull tube 12 is vertically movable within the worktable 13. The operation of the machine tool pull tube 12, the worktable 13, and the machine tool pull tube 12 are all conventional technologies of existing machine tools and will not be elaborated further here.

[0024] The clamping fixture includes a base 20 extending coaxially, a spindle 30, a lower clamping plate 40, and an upper clamping plate 50. The base 20 is fixedly connected to the top of the worktable 13. The base 20 is provided with a connecting plate 21 that can move up and down. The bottom end of the connecting plate 21 is fixedly connected to the machine tool pull tube 12 so that it can be driven by the machine tool pull tube 12 to move up and down synchronously. In addition, the connecting plate 21 is evenly connected with a plurality of pull rods 22 along the circumference. The number of pull rods 22 can be three or more, so as to provide a uniform downward clamping force in the circumference of the slender sleeve-like workpiece 11. The mandrel 30 extends vertically and is fixedly connected to the top of the base 20. The top of the mandrel 30 is provided with a positioning structure for positioning on the bottom end face of the inner cavity of the slender sleeve workpiece 11. Both the upper clamping plate 50 and the lower clamping plate 40 are annular. The lower clamping plate 40 is connected to the top of the base 20, and the inner cavity of the lower clamping plate 40 is adapted to the lower part of the slender sleeve-like workpiece 11. The inner cavity of the upper clamping plate 50 is adapted to the upper part of the slender sleeve-like workpiece 11. Meanwhile, a plurality of pull rods 22 penetrate vertically through the upper clamping plate 50 and are screwed with nuts 23 at the top.

[0025] During operation, the outer contour of the slender sleeve-like workpiece 11 first contacts the lower clamping plate 40, and then the upper clamping plate 50 is placed. The nuts 23 on each pull rod 22 are tightened, and the screwing depth of the nuts 23 is kept consistent. The slender sleeve-like workpiece 11 is fitted onto the mandrel 30. With the help of the machine tool pull tube 12, a downward hydraulic clamping force is applied. The mandrel 30 is used to position the workpiece at the bottom end face of the inner cavity. The upper clamping plate 50 and the lower clamping plate 40 are used to clamp and fix the slender sleeve-like workpiece 11 in the outer circumference, thereby clamping and fixing the slender sleeve-like workpiece 11 on the machine tool worktable 13. The work efficiency is high and the labor intensity is low. At the same time, the hydraulic clamping and fixing method can provide more reliable clamping stability and ensure the consistency of the wall thickness dimension of the end face of the slender sleeve-like workpiece 11.

[0026] In one embodiment, the connecting plate 21 has a T-shaped cross-section and includes a circular plate body 211 and a first connecting shaft 212 vertically connected to the bottom center of the circular plate body 211. A plurality of the pull rods 22 are vertically connected to the circular plate body 211. The first connecting shaft 212 is threaded into the machine tool pull tube 12 to facilitate the quick installation and disassembly of the clamping fixture and to facilitate maintenance.

[0027] Because the mandrel 30 is relatively long and its top serves as a positioning element, it wears out quickly during use. Replacing the long mandrel 30 each time is costly in terms of materials, time, and labor. Therefore, in one embodiment, the mandrel 30 includes a mandrel body 31 and a top block 32 detachably connected to the top of the mandrel body 31. The positioning structure is located on top of the top block 32. In this way, only the top block 32 needs to be replaced each time, which is convenient for replacement and can also save materials and manufacturing costs.

[0028] In one embodiment, the top block 32 includes a block 321, a protrusion 322 on the top of the block 321, and a second connecting shaft 323 on the bottom of the block 322. The second connecting shaft 323 is threaded to the top end of the mandrel body 31 to facilitate quick connection or disassembly between the top block 32 and the mandrel body 31. The top outer edge of the block 321 is provided with an arc-shaped transition structure. The arc-shaped transition structure and the protrusion 322 constitute the positioning structure. The protrusion 322 abuts against the bottom end face of the inner cavity of the slender sleeve-like workpiece 11, and the arc-shaped transition structure abuts against the side wall of the inner cavity to achieve accurate positioning of the slender sleeve-like workpiece 11 in the inner cavity, thereby ensuring the consistency of the end face wall thickness.

[0029] In one embodiment, the lower clamping plate 40 is connected to the base 20 circumferentially by a plurality of studs 41, wherein the head of the stud 41 is located above the lower clamping plate 40, and the shank of the stud 41 is fitted with a spring 42, and the spring 42 is elastically connected between the lower clamping plate 40 and the base 20. Thus, after the slender sleeve-like workpiece 11 is placed, the outer contour of the workpiece first contacts the lower clamping plate 40, and the upper clamping plate 50 is placed after the spring 42 retracts. This allows the mandrel 30 to make flexible contact with the inner cavity of the workpiece during hydraulic tensioning, thereby avoiding the problem of hard collision between the bottom surface of the inner cavity and the mandrel 30 during clamping. At the same time, it can achieve the purpose of shockproofing after clamping and during processing.

[0030] In one embodiment, the outer periphery of the lower clamping plate 40 is provided with a clearance notch 43 for avoiding the pull rod 22, so that the pull rod 22 can be closer to the spindle 30, thereby providing a more stable and reliable downward pulling force to the upper clamping plate 50.

[0031] In one embodiment, the upper clamping plate 50 is provided with an arc-shaped channel 501 along the circumference that cooperates with the pull rod 22. At the same time, multiple arc-shaped channels 501 are provided with a stripping hole 502 at one end in the same direction, and the diameter of the stripping hole 502 is larger than the outer diameter of the nut 23. In this way, when changing to a new workpiece, it is not necessary to completely disassemble the nut 23. Simply rotate the upper clamping plate 50, and when the stripping hole 502 is aligned with the nut 23, the upper clamping plate 50 can be easily removed, making it more convenient to use.

[0032] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance and can be interpreted as names.

[0033] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A clamping fixture for machining the end face of a slender sleeve, used to fix a slender sleeve-like workpiece on a machine tool, wherein the machine tool is equipped with a machine tool drawing tube and a worktable, the machine tool drawing tube being movably disposed within the worktable, characterized in that, The clamping fixture includes a base extending coaxially, a mandrel, a lower clamping plate, and an upper clamping plate. The base is fixedly connected to the top of the worktable. The base has a connecting plate that can move up and down. The bottom end of the connecting plate is fixedly connected to the machine tool pull tube. Multiple pull rods are evenly connected to the connecting plate circumferentially. The mandrel extends vertically and is fixedly connected to the top of the base. The top of the mandrel has a positioning structure. The upper clamping plate and the lower clamping plate are both annular. The lower clamping plate is connected to the top of the base, and the inner cavity of the lower clamping plate is adapted to the lower part of the slender sleeve-like workpiece. The inner cavity of the upper clamping plate is adapted to the upper part of the slender sleeve-like workpiece. Multiple pull rods vertically penetrate the upper clamping plate and are screwed with nuts at the top.

2. The clamping fixture for machining the end face of a slender sleeve as described in claim 1, characterized in that, The connecting plate has a T-shaped cross-section and includes a circular disc body and a first connecting shaft vertically connected to the center of the bottom of the circular disc body. A plurality of the pull rods are vertically connected to the circular disc body, and the first connecting shaft is threaded into the machine tool tube.

3. The clamping fixture for machining the end face of a slender sleeve as described in claim 2, characterized in that, The number of tie rods is greater than or equal to 3.

4. The clamping fixture for machining the end face of a slender sleeve as described in claim 1, characterized in that, The mandrel includes a mandrel body and a top block detachably connected to the top of the mandrel body, with the positioning structure located on top of the top block.

5. The clamping fixture for machining the end face of a slender sleeve as described in claim 4, characterized in that, The top block includes a block body, a protrusion on the top of the block body, and a second connecting shaft on the bottom of the block body. The second connecting shaft is threaded to the top end of the spindle body. The outer edge of the top of the block body is provided with an arc-shaped transition structure. The arc-shaped transition structure and the protrusion constitute the positioning structure.

6. The clamping fixture for machining the end face of a slender sleeve as described in claim 1, characterized in that, The lower clamping plate is connected to the base circumferentially by a plurality of studs, and the head of the studs is located above the lower clamping plate. The shank of the studs is fitted with a spring, and the spring is elastically connected between the lower clamping plate and the base.

7. The clamping fixture for machining the end face of a slender sleeve as described in claim 1, characterized in that, The outer periphery of the lower clamping plate is provided with a clearance notch for avoiding the pull rod.

8. The clamping fixture for machining the end face of a slender sleeve as described in claim 1, characterized in that, The upper clamping plate is provided with an arc-shaped channel along the circumference that cooperates with the pull rod. Multiple arc-shaped channels are provided with a material release hole at one end in the same direction. The diameter of the material release hole is larger than the outer diameter of the nut.

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