Machining elastic clamping device

Abstract

The application provides a mechanical processing elastic clamping device, which comprises a sleeve assembly. A ring-shaped boss is arranged in the middle of the sleeve assembly to divide the sleeve assembly into two segments in a T-shaped cylindrical structure. A steel cable assembly is wound around one of the two segments of the sleeve assembly. A rotating position end cover is arranged in the middle of the sleeve assembly and can rotate on the sleeve assembly. A backup cap is sleeved on the sleeve assembly to cover the steel cable assembly and butt against the rotating position end cover. The clamping piece can be quickly loaded and unloaded in the sleeve system, and the mechanical processing clamping efficiency is improved. A spiral groove is arranged on the sleeve assembly to place the steel cable. The rotating position assembly is used to limit the rotation of the steel cable to control the tightness of the steel cable. The sleeve system is elastically opened and closed. In the clamping state, the clamping force is uniformly distributed on the cylindrical surface of the clamping piece. Meanwhile, the flexibility of the steel cable can resist the inward deformation of the clamping piece, reduce the deformation of the workpiece during clamping, and improve the clamping quality.

Description

Technical Field

[0001] This invention relates to a flexible clamping device for machining, belonging to the field of mechanical manufacturing technology. Background Technology

[0002] In machining, workpiece clamping is a crucial step that directly impacts manufacturing efficiency and quality. Existing clamping methods often employ rigid clamping mechanisms, primarily using mechanical connections such as chucks, bolts, and pressure plates to fix the workpiece to the machine tool table. However, these methods have the following limitations:

[0003] 1) The clamping process is cumbersome and time-consuming;

[0004] 2) Rigid clamping systems have small buffers, large vibrations, and are difficult to control.

[0005] 3) When clamping thin-walled or rigid parts, the workpiece may be deformed, affecting the machining accuracy.

[0006] To address these issues, the industry has developed several flexible clamping devices, such as spring collets and rubber collets. These devices connect the workpiece to the machine tool table using elastic elements, improving clamping efficiency and machining quality to some extent. However, existing flexible clamping devices still have certain limitations in use, such as a short service life of the elastic elements, easy wear, and difficulty in adjusting the stiffness of the elastic elements, which cannot meet the machining requirements of different workpieces. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a machining elastic clamping device, which enables the clamping parts to be loaded and unloaded quickly in the ferrule system, thereby improving the machining clamping efficiency. Furthermore, a spiral groove is provided on the ferrule assembly to place the steel cable, and the tension of the steel cable is adjusted by the rotation of the positioning component, thereby realizing the elastic opening and closing of the ferrule system.

[0008] The present invention is achieved through the following technical solutions.

[0009] This invention provides a flexible clamping device for machining, including a ferrule assembly. The ferrule assembly has an annular boss in the middle dividing it into two T-shaped cylindrical sections. A steel cable assembly is wound around one section of the ferrule assembly. A rotating end cap is installed in the middle of the ferrule assembly and can rotate on the ferrule assembly. A spare cap is fitted onto the ferrule assembly, covering the steel cable assembly and engaging with the rotating end cap. The spare cap has a threaded external fixing groove, in which the steel cable assembly fits. A positioning rod is movably inserted on the rotating end cap to limit its rotation. The ferrule assembly is equipped with a fixing screw and a tightening nut to tighten the steel cable.

[0010] The steel cable assembly consists of a steel cable. One end of the steel cable is fixed to the ferrule assembly via a steel cable mounting seat, and the other end is connected to a steel cable connector. A fixing nut is fitted on the steel cable connector, and a wire fixing screw and a tightening nut are installed on the fixing nut.

[0011] The end face of the rotating end cap is connected to a fixed cover, and the fixed cover and the rotating end cap are fixed by left screws distributed around the circumference.

[0012] The fixed cover has a fixing nut mounting hole on its circumferential surface for installing a fixing nut, and a left mounting hole is provided through the end face of the fixed cover for installing a left screw. The screw-on end cover has a left screw hole for fixing the left screw.

[0013] The annular boss of the ferrule assembly has a limiting groove and a positioning groove. The inner wall of the screw-on end cap has a limiting boss that fits into the limiting groove, and the positioning rod is inserted into the positioning groove.

[0014] The positioning groove has a two-section structure, with one section being deeper than the other, so that the end of the positioning rod can be placed in the deeper section to prevent rotation.

[0015] The end of the spare cap is secured with a right screw, and a second opening groove is formed along the axial direction on the outer side of the spare cap.

[0016] The ferrule assembly has multiple first opening slots along its axial direction on a section around which the steel cable assembly is wound.

[0017] The inner wall of the rotating end cap has a needle roller groove for installing needle rollers.

[0018] Both the cable connector and the cable mounting base are fixed by fixing screws, and fixing nuts are fitted onto the ends of the fixing screws.

[0019] The beneficial effects of this invention are as follows: Firstly, it enables the clamping component to be loaded and unloaded quickly within the ferrule system, improving machining clamping efficiency. Secondly, a spiral groove is provided on the ferrule assembly to hold a steel cable. The rotation of the positioning component limits the tension of the steel cable, achieving elastic opening and closing of the ferrule system. In the clamped state, the clamping force is evenly distributed on the cylindrical surface of the clamping component. Simultaneously, the flexibility of the steel cable can resist the inward deformation of the clamping component, reducing workpiece clamping deformation and improving clamping quality. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of at least one embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Rear view of the card sleeve assembly;

[0022] Figure 3 yes Figure 1 A partial half-section structural diagram;

[0023] Figure 4 yes Figure 1 A schematic diagram of a partial cross-section on the left.

[0024] In the diagram: 1-Left screw, 2-Fixing cap, 21-Left mounting hole, 22-Fixing nut mounting hole, 3-Collar assembly, 31-Limiting groove, 32-Positioning groove, 33-First opening groove, 34-Right mounting hole, 35-Inner wire fixing groove, 36-Clamping hole, 4-Wire fixing screw, 5-Fixing nut, 6-Tightening nut, 7-Positioning rod, 71-Positioning head, 8-Cable assembly, 81-Cable connector, 82-Cable mounting base, 83-Cable, 9-Screw-on end cap, 91-Left screw hole, 92-Screw-on rod, 93-Limiting boss, 10-Spare cap, 101-Second opening groove, 102-Outer wire fixing groove, 11-Right screw, 12-Needle roller, 13-Fixing screw, 14-Clamping piece. Detailed Implementation

[0025] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0026] Example 1

[0027] like Figures 1 to 4 The mechanical processing elastic clamping device shown includes a clamping assembly 3; the clamping assembly 3 has an annular boss in the middle that divides the clamping assembly 3 into two T-shaped cylindrical structures. A steel cable assembly 8 is wound around one of the sections of the clamping assembly 3. A rotating end cap 9 is installed in the middle of the clamping assembly 3 and can rotate on the clamping assembly 3. A spare cap 10 is fitted on the clamping assembly 3 to cover the steel cable assembly 8 and mate with the rotating end cap 9. The spare cap 10 has a threaded outer fixing groove 102 inside, and the steel cable assembly 8 is fitted in the outer fixing groove 102. A positioning rod 7 is movably inserted on the rotating end cap 9 to limit the rotation of the rotating end cap 9. A fixing screw 4 and a tightening nut 6 are installed on the clamping assembly 3 to tighten the steel cable 83.

[0028] Example 2

[0029] Based on Embodiment 1, the steel cable assembly 8 is composed of a steel cable 83. One end of the steel cable 83 is fixed to the ferrule assembly 3 through the steel cable mounting seat 82, and the other end is connected to the steel cable connector 81. A fixing nut 5 is fitted on the steel cable connector 81, and a wire fixing screw 4 and a tightening nut 6 are installed on the fixing nut 5.

[0030] Furthermore, both the cable connector 81 and the cable mounting base 82 are fixed by fixing screws 13, and fixing nuts 5 are fitted onto the ends of fixing screws 13.

[0031] Example 3

[0032] Based on Embodiment 1, a fixing cover 2 is connected and installed on the end face of the rotating end cover 9, and the fixing cover 2 and the rotating end cover 9 are fixed by left screws 1 distributed around the circumference.

[0033] Furthermore, the circumferential surface of the fixing cover 2 is provided with a fixing nut mounting hole 22 for installing the fixing nut 5, and the end face of the fixing cover 2 is provided with a left mounting hole 21 for installing the left screw 1. The end face of the screw-on end cover 9 is provided with a left screw hole 91 for fixing the left screw 1.

[0034] Furthermore, the end of the spare cap 10 has a right screw 11 for fixing, and a second opening groove 101 is opened along the axial direction on the outer side of the spare cap 10.

[0035] Example 4

[0036] Based on embodiment 1, the annular boss of the ferrule assembly 3 has a limiting groove 31 and a positioning groove 32. The inner wall of the rotating end cap 9 has a limiting boss 93 that is fitted into the limiting groove 31. The positioning rod 7 is inserted into the positioning groove 32.

[0037] Furthermore, the positioning groove 32 has a two-section structure, with the depth of one section being greater than the depth of the other section, so that the end of the positioning rod 7 can be placed in the section with greater depth to prevent rotation.

[0038] Furthermore, a section of the ferrule assembly 3 around which the steel cable assembly 8 is wound has multiple first opening slots 33 along the axial direction.

[0039] Furthermore, the inner wall of the rotating end cap 9 has a needle roller groove for installing the needle roller 12.

[0040] Example 5

[0041] Based on the above embodiments, the opening slot in the structural section provides elasticity to the ferrule assembly. A space is provided on the ferrule assembly structure to install a steel cable assembly. One end of the steel cable assembly, with a steel cable mounting seat, is installed on the ferrule assembly using a fixing screw. The other end has a steel cable connector, which is installed on the rotating end cap and fixing cap assembly by tightening a fixing nut. The clamping end of the ferrule assembly is fixed to the machine tool chuck. The tightening nut and fixing screw are adjusted to tighten the slack steel cable. A limiting groove of a certain angle and width is provided on the ferrule assembly to match the radial elastic deformation of the ferrule. The width of the positioning groove is set to match the diameter of the positioning head, limiting the circumferential travel angle of the rotating end cap's limiting boss within the limiting groove of the ferrule assembly. Simultaneously, the positioning head on the positioning rod moves within the limiting groove. When it reaches the clamping point, the positioning head falls into the positioning groove, and the ferrule assembly maintains a clamped state. After the clamp is manufactured, the positioning head is removed from the positioning slot. Under the preload of the steel cable, the limiting boss of the rotating end cap returns to the reversing locking point of the limiting slot, the ferrule assembly opens and springs back, and the clamping force of the clamp is released, realizing the clamping and unloading of the clamp. By rotating the rotating end cap, the steel cable is driven to realize the closing and opening of the ferrule assembly, completing the clamping and unloading of the clamp.

[0042] The main body of the structural device has a ferrule assembly, on which wiring paths are opened, and winding steel cables are distributed along the paths.

[0043] The sleeve assembly and the spare cap structure are designed with the same circumferentially distributed opening slots, which ensure that the spare cap and the sleeve assembly retract in the closed and open states without interference.

[0044] The end cap has a limiting boss, and the ferrule assembly has a limiting groove. The angle and width of the limiting groove match the radial elastic deformation of the ferrule, thus limiting the clamping degree of the ferrule assembly.

[0045] The positioning rod has a positioning head. The width of the positioning groove is set to match the diameter of the positioning head. When the positioning head reaches the locking position, it falls into the positioning groove to maintain clamping.

[0046] A steel cable assembly is installed on the ferrule assembly structure. The steel cable has a steel cable mounting seat and a steel cable connector at both ends. The steel cable mounting seat and the steel cable connector are fixed to the steel cable by crimping and welding to form a steel cable assembly.

[0047] The ferrule assembly and the spare cap are provided with spiral wire fixing grooves, which are aligned in the inner and outer directions to prevent the steel cable from shifting in the spiral distance.

[0048] The fixing nut has a tightening nut and a wire-fixing screw, which are used to tighten the loose steel cable.

[0049] The hollow inner cavity of the rotating end cap is provided with a needle roller groove, and a needle roller is installed in the needle roller groove to ensure that the rotating end cap can rotate flexibly relative to the ferrule assembly.

[0050] The main way to use this invention is as follows:

[0051] 1) Preparation process: Fix the clamping end of the ferrule assembly 3 to the machine tool chuck, adjust and tighten the nut 6 and the wire fixing screw 4 to tighten the slack steel cable 83. At this time, the limiting boss 93 of the rotating end cover 9 is in the reverse clamping position of the limiting groove 31 of the ferrule assembly 3, and the positioning head 71 on the positioning rod 7 is pulled up into the limiting groove 31. The system is in the state of waiting to clamp the workpiece.

[0052] 2) Clamping process: Rotate the rotating rod 92 on the rotating end cover 9 in sequence, drive the steel cable 83 to close the opening of the ferrule assembly, the upper limit boss 93 of the rotating end cover 9 slides in the limiting groove 31, and the positioning head 71 on the positioning rod 7 slides with the rotating end cover 9 until the limiting boss 93 reaches the clockwise locking position in the limiting groove 31. At this time, the positioning head 71 on the positioning rod 7 falls into the positioning groove 32 of the ferrule assembly 3, realizing the elastic closing of the ferrule assembly and keeping the clamp 14 in a clamped state;

[0053] 3) Unclamping process: Tighten the rotating rod 92 on the rotating end cover 9, pull the positioning head 71 on the positioning rod 7 out of the positioning groove 32 of the ferrule assembly 3, and under the pre-tightening force of the steel cable 83, the limiting boss 93 of the rotating end cover 9 returns to the reversing locking point of the limiting groove 31, the opening of the ferrule assembly springs back, the clamping force of the clamp 14 is released, and the clamping and disassembly of the clamp 14 is realized.

[0054] In the above process, the clamping force range can be controlled by setting the size of the opening slot and the angular distance of the limiting slot 31.

Claims

1. A machine tool elastic clamping device, comprising a ferrule assembly (3), characterized in that: The ferrule assembly (3) has an annular boss in the middle that divides the ferrule assembly (3) into two T-shaped cylindrical structures. A steel cable assembly (8) is wound around one of the sections of the ferrule assembly (3). A rotating end cap (9) is installed in the middle of the ferrule assembly (3) and the rotating end cap (9) can rotate on the ferrule assembly (3). A spare cap (10) is fitted on the ferrule assembly (3) to cover the steel cable assembly (8) and to engage with the rotating end cap (9). The spare cap (10) has a threaded outer wire fixing groove (102) inside. The steel cable assembly (8) is fitted in the outer wire fixing groove (102). A positioning rod (7) is movably inserted on the rotating end cap (9) to limit the rotation of the rotating end cap (9). A wire fixing screw (4) and a tightening nut (6) are installed on the ferrule assembly (3) to tighten the steel cable (83). The cable assembly (8) is composed of a cable (83). One end of the cable (83) is fixed to the ferrule assembly (3) through the cable mounting seat (82), and the other end is connected to the cable connector (81). A fixing nut (5) is fitted on the cable connector (81), and a wire fixing screw (4) and a tightening nut (6) are installed on the fixing nut (5). The annular boss of the sleeve assembly (3) has a limiting groove (31) and a positioning groove (32). The inner wall of the rotating end cap (9) has a limiting boss (93) that fits into the limiting groove (31). The positioning rod (7) is inserted into the positioning groove (32). The end of the spare cap (10) is fixed with a right screw (11), and the outer side of the spare cap (10) has a second opening groove (101) along the axial direction; a section of the steel cable assembly (8) is wound around the ferrule assembly (3) and has multiple first opening grooves (33) along the axial direction.

2. The machining elastic clamping device as described in claim 1, characterized in that: The end face of the rotating end cap (9) is connected to a fixing cap (2), and the fixing cap (2) and the rotating end cap (9) are fixed by left screws (1) distributed around the circumference.

3. The machining elastic clamping device as described in claim 2, characterized in that: The fixed cover (2) has a fixed nut mounting hole (22) on its circumferential surface for mounting a fixed nut (5), and a left mounting hole (21) is provided through the end face of the fixed cover (2) for mounting a left screw (1). The end face of the rotating end cover (9) has a left screw hole (91) for fixing the left screw (1).

4. The machining elastic clamping device as described in claim 1, characterized in that: The positioning groove (32) has a two-section structure, with the depth of one section being greater than the depth of the other section, so that the end of the positioning rod (7) can be placed in the section with the greater depth to prevent rotation.

5. The machine tool elastic clamping device as described in claim 1, characterized in that: The inner wall of the rotating end cap (9) has a needle roller groove for installing needle rollers (12).

6. The machining elastic clamping device as described in claim 1, characterized in that: The cable connector (81) and the cable mounting base (82) are both fixed by fixing screws (13), and fixing nuts (5) are fitted onto the end of fixing screws (13).

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