Workpiece clamping device for machining center

Abstract

The utility model discloses a workpiece clamping device for machining center, including base, limit ring, adjusting seat and top tight mechanism, be provided with the circular boss on the base, is provided with the annular clamping groove to the boss outer periphery, and the several adjusting seat is clamped in the clamping groove, and adjusting seat is along the clamping groove circumferential movement and is positioned through the clamping block and locking screw, be provided with top tight mechanism on adjusting seat, and top tight mechanism includes screw rod, handle and pressure plate, is used for clamping workpiece from multiple directions, the mounting plate with U type opening is equipped with on base both sides to realize quick installation and fixed, and the base edge is equipped with the discharge chute, and the limit ring lower part is equipped with the let -alone slot cooperation and uses the chip removal. The device can realize the clamping operation of multiple points, adjustable, is applicable to the high stability fixation of special-shaped workpiece, overcomes the traditional fixture positioning accuracy poor, poor adaptability, the problem of clamping instability, improves the machining accuracy and adaptability.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for CNC machine tool processing, and specifically relates to a workpiece clamping device for machining centers. Background Technology

[0002] In machining processes, to ensure the stability and accuracy of workpiece processing, it is usually necessary to securely clamp the workpiece onto the worktable of the machining center. Traditional clamping methods often use general-purpose fixtures, vises, or custom-made clamps for fixation, which are well-suited for workpieces with regular shapes. However, with the increasing diversification and complexity of machined parts, more and more irregularly shaped workpieces are appearing in production. Existing clamping methods often suffer from poor adaptability, difficulty in adjustment, and insecure clamping when dealing with such workpieces.

[0003] For example, when dealing with workpieces with asymmetrical shapes or irregular contours, traditional fixtures often cannot provide uniform clamping force from multiple directions, causing workpiece displacement during machining and severely affecting machining quality. Furthermore, to adapt to the clamping requirements of different workpieces, frequent fixture changes or customization are often necessary, increasing equipment setup time and labor costs, and reducing machining efficiency.

[0004] Although some clamping devices in the existing technology have certain adjustment structures, they still have obvious shortcomings in terms of adjustment accuracy, multi-directional clamping capability and versatility. Especially in the case of machining center, there is still a lack of a universal clamping mechanism that can quickly position, adapt to various workpiece shapes and achieve multi-point clamping. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a workpiece clamping device for machining centers, which can adapt to workpieces of different shapes, has high clamping stability, flexible adjustment and convenient use.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A workpiece clamping device for a machining center includes a circular base. A limit ring is fixed on the upper surface of the base near the edge. An annular groove is provided between the limit ring and the edge of the upper surface of the base. Several adjustable seats that can move in a circumferential direction are clamped inside the annular groove. A clamping mechanism is installed on the adjustable seats to perform a clamping operation towards the center of the base. The adjustable seats can be fixed in position after position adjustment.

[0008] Furthermore, a circular boss is provided at the center of the upper surface of the base, and a first guide groove forming an annular slot is provided on the outer circumferential surface of the boss.

[0009] Furthermore, mounting plates are fixed on both the left and right sides of the base, and a U-shaped opening is provided at the end of the mounting plate away from the base.

[0010] Furthermore, the upper surface of the base has several evenly arranged discharge grooves near the edge, and the inner bottom surface of the discharge grooves is provided with an inclined surface.

[0011] Furthermore, a second guide groove forming an annular groove is provided on the inner side of the limiting ring, and several clearance grooves corresponding to the discharge groove are provided on the lower side of the limiting ring.

[0012] Furthermore, the lower end of the adjusting seat is fixed with a locking block that is locked in an annular groove. The lower end of the locking block is provided with a locking edge that protrudes outwards, and a locking screw is threaded onto the locking edge.

[0013] Furthermore, the tightening mechanism includes a screw threaded through the adjusting seat, a handle fixed to one outer end of the screw, and a pressure plate rotatably connected to one inner end of the screw.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This device, by setting a circular boss on the base, facilitates the preliminary positioning of the workpiece before clamping. The flat bearing surface of the boss is consistent with the machining datum of the machining center, effectively solving the problems of uneven workpiece placement and inaccurate positioning in existing clamping devices, thereby improving the centering accuracy and machining consistency of the workpiece during the machining process.

[0016] By setting an annular slot and several adjustable seats, the adjustable seats can move freely in the circumferential direction and can adapt to workpieces of various shapes and sizes. This solves the problem of poor adaptability of clamping devices in the prior art, which can only fix specific types of workpieces, and improves the versatility and flexibility of the fixture.

[0017] With the screw-plate clamping mechanism on the adjusting seat, multiple pressure plates can clamp the workpiece evenly from different directions, overcoming the problems of single clamping force direction and unstable clamping effect of traditional fixtures. It is especially suitable for clamping and fixing irregular or shaped workpieces, significantly improving clamping stability and vibration resistance of the workpiece during processing.

[0018] The double-guide structure formed by the fit between the limit ring and the base allows for fixation via a threaded locking structure after the position of the adjustment seat is adjusted. This ensures that no displacement occurs after adjustment, avoids workpiece displacement due to loose fixtures during processing, improves clamping reliability, and guarantees processing accuracy.

[0019] By setting up an installation plate and a U-shaped opening structure, the clamping device can be quickly installed and stably connected to the machining center worktable, solving the problems of cumbersome installation and unstable positioning of existing clamping devices, and improving the operating efficiency and overall ease of use of the clamping device.

[0020] By providing a discharge groove on the edge of the base, and in conjunction with the clearance groove structure below the limit ring, the cutting fluid and chips generated during processing can be discharged in a timely manner, preventing debris from accumulating inside the clamping structure. This overcomes the problems of difficult cleaning and short service life of traditional clamps, and effectively improves the durability of the clamping device and the cleanliness of the working environment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the base of this utility model;

[0023] Figure 3 This is a schematic diagram of the limiting ring of this utility model;

[0024] Figure 4 This is a schematic diagram of the adjustment seat of this utility model;

[0025] Figure 5 This is a schematic diagram of the clamping mechanism of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Base; 11. Boss; 12. First guide groove; 13. Discharge groove; 14. Mounting plate; 2. Limiting ring; 21. Second guide groove; 22. Clearance groove; 3. Adjusting seat; 31. Locking block; 32. Locking screw; 4. Tightening mechanism; 41. Rotary handle; 42. Screw; 43. Pressure plate; 5. Annular groove. Detailed Implementation

[0028] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0029] like Figure 1As shown, a workpiece clamping device for a machining center includes a circular base 1. A limit ring 2 is fixed near the edge of the upper surface of the base 1. An annular groove 5 is formed between the limit ring 2 and the base 1. Several adjustable seats 3 that can move in a circumferential direction are evenly distributed on the inner side of the annular groove 5. The adjustable seat 3 includes a main body, a locking block 31, and a locking screw 32. The locking block 31 is located at the bottom of the adjustable seat 3 and is locked in the annular groove 5. The lower part of the locking block 31 has an outwardly protruding locking edge, which is threaded to the upper part of the locking block 31 by the locking screw 32 to press against the lower groove wall of the limit ring 2 to lock and fix the adjustable seat 3. The adjusting seat 3 is equipped with a clamping mechanism 4, which includes a screw 42 passing through the adjusting seat 3, a handle 41 installed at the outer end of the screw 42, and a pressure plate 43 located at the inner end of the screw 42 and capable of being pushed radially. Rotating the handle 41 can drive the screw 42 to rotate, thereby moving the pressure plate 43 towards the center of the base 1 to clamp and fix the workpiece. Multiple adjusting seats 3 can adjust their angle and position along the annular groove 5 and maintain their position through the locking screw 32, thereby adapting to the clamping requirements of workpieces of different sizes and shapes and solving the problems of poor adaptability, inaccurate positioning, and unstable clamping in the prior art.

[0030] like Figure 2 As shown, a circular boss 11 is provided at the center of the upper surface of the base 1; the upper surface of the boss 11 is flat and is used to support the bottom surface of the workpiece being processed, thereby enhancing the support stability during the clamping process; an annular first guide groove 12 is provided on the outer circumferential surface of the boss 11. The first guide groove 12 extends along the circumferential direction and cooperates with the second guide groove 21 on the limiting ring 2 to form an annular slot 5, which is used to accommodate and guide the movement of the locking block 31 of the adjusting seat 3 within it, thereby providing a guiding basis for the free adjustment of the adjusting seat 3 in the circumferential direction; the boss 11 not only improves the clamping flatness, but also facilitates the center positioning of the workpiece relative to the fixture, effectively improving the clamping accuracy and machining centering.

[0031] like Figure 2 As shown, mounting plates 14 are fixed on both the left and right sides of the base 1; the mounting plates 14 are set perpendicularly to the base 1, forming the installation connection structure of the whole device on the machining center; the end of the mounting plate 14 away from the base 1 is provided with a U-shaped opening, which is used in conjunction with the T-bolt on the worktable of the machining center. The bolt passes through the U-shaped opening and is locked in the T-slot of the worktable of the machining center, thereby realizing the rapid positioning and firm fixation of this clamping device, avoiding the machining deviation caused by the displacement of the fixture during the machining process, and improving the overall system operation stability.

[0032] like Figure 2As shown, the upper surface of the base 1 has several evenly arranged discharge grooves 13 near the edge. The discharge grooves 13 are symmetrically arranged along the outer ring of the base 1 to discharge cutting fluid, chips and other debris in a timely manner during the clamping process, preventing them from accumulating in the clamping structure and affecting the normal movement of the adjusting seat 3 and the pressure plate 43. The inner bottom surface of the discharge groove 13 is provided with an inclined surface, which is used to guide the liquid and chips to flow out naturally in a set direction, thereby maintaining the clean state inside the fixture, effectively extending the service life of the clamping device and ensuring the machining accuracy.

[0033] like Figure 3 As shown, the inner side of the limiting ring 2 is provided with a second guide groove 21 that forms an annular groove 5; the second guide groove 21 is aligned and combined with the first guide groove 12 on the base 1 to form a complete annular groove 5, which is used for the locking block 31 at the lower end of the adjusting seat 3 to be locked and slide along it; the lower side of the limiting ring 2 is also provided with several clearance grooves 22 corresponding to the discharge groove 13. The clearance grooves 22 are used to provide space buffer when the discharge groove 13 discharges cutting fluid and impurities, so as to avoid the accumulation of debris in the groove structure, affecting the degree of freedom of movement and locking accuracy of the adjusting seat 3, thereby ensuring the smoothness and reliability of the entire clamping process.

[0034] like Figure 4 As shown, the lower end of the adjusting seat 3 is fixed with a locking block 31 that is locked in the annular groove 5; the lower periphery of the locking block 31 is provided with a locking edge that protrudes outwards to cooperate with the inner wall of the guide groove to prevent it from falling off and to improve the positioning stability of the adjusting seat 3 in the groove; a locking screw 32 is threaded on the locking edge, and the locking screw 32 is screwed in from the upper part of the adjusting seat 3. When the screw head is pressed against the bottom of the groove between the first guide groove 12 and the second guide groove 21, the adjusting seat 3 is firmly locked in the current position, thereby achieving high-precision position retention after adjustment and avoiding dimensional deviations caused by the loosening of the fixture during the processing.

[0035] like Figure 5 As shown, the clamping mechanism 4 includes a screw 42 threaded through the adjusting seat 3; a handle 41 for manual operation is fixedly connected to one outer end of the screw 42, the handle 41 has an anti-slip structure, making it easy for the operator to hold and apply torque; one inner end of the screw 42 is rotatably connected to the pressure plate 43, the outer surface of the pressure plate 43 has an arc-shaped structure, which can adapt to the surface of workpieces with different curved shapes. The pressure plate 43 is pushed axially under the drive of the rotation of the screw 42, thereby pressing the side of the workpiece; the clamping mechanism 4, which is set on multiple adjusting seats 3, clamps the workpiece evenly from different directions, further improving the clamping firmness and vibration resistance during the processing, especially suitable for the processing and positioning needs of irregular shaped workpieces.

[0036] The working principle of this utility model is as follows: When clamping the workpiece, the entire device is placed on the worktable of the machining center and locked in place by T-bolts in the U-shaped opening on the mounting plate 14. Then, the workpiece is placed on the upper surface of the boss 11. At this time, according to the shape of the workpiece, the positions of multiple adjusting seats 3 are adjusted along the annular groove 5 so that the multiple adjusting seats 3 are in different positions of the workpiece. After the position of the adjusting seats 3 is adjusted, the locking screw 32 is tightened against the bottom of the annular groove 5 to fix the position of the adjusting seats 3. Then, the screw 42 is rotated by the handle 41 so that the pressure plate 43 is pressed against the side of the workpiece. The pressure plates 43 on the screws 42 in multiple positions press against the workpiece from multiple directions, thereby completing the stable clamping and fixing of the irregular workpiece.

[0037] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A workpiece clamping device for a machining center, characterized in that: The device includes a circular base (1), a limiting ring (2) is fixed on the upper surface of the base (1) near the edge, an annular groove (5) is provided between the limiting ring (2) and the edge of the upper surface of the base (1), a number of adjustable seats (3) that can move in the circumferential direction are fitted on the inner side of the annular groove (5), a clamping mechanism (4) is installed on the adjustable seat (3) that can clamp towards the center of the base (1), and the adjustable seat (3) can be fixed in position after position adjustment.

2. The workpiece clamping device for a machining center according to claim 1, characterized in that: The upper surface of the base (1) is provided with a circular boss (11) at the center, and the outer circumferential surface of the boss (11) is provided with a first guide groove (12) forming an annular slot (5).

3. The workpiece clamping device for a machining center according to claim 2, characterized in that: Mounting plates (14) are fixed on both the left and right sides of the base (1), and a U-shaped opening is provided at the end of the mounting plate (14) away from the base (1).

4. The workpiece clamping device for a machining center according to claim 3, characterized in that: The upper surface of the base (1) has several uniformly arranged discharge grooves (13) near the edge, and the inner bottom surface of the discharge grooves (13) is provided with an inclined surface.

5. A workpiece clamping device for a machining center according to claim 4, characterized in that: The inner side of the limiting ring (2) is provided with a second guide groove (21) that forms an annular groove (5), and the lower side of the limiting ring (2) is provided with a number of clearance grooves (22) corresponding to the discharge groove (13).

6. A workpiece clamping device for a machining center according to claim 5, characterized in that: The lower end of the adjusting seat (3) is fixed with a locking block (31) that is locked in the annular slot (5). The lower end of the locking block (31) is provided with a locking edge that protrudes outwards. A locking screw (32) is threaded on the locking edge.

7. A workpiece clamping device for a machining center according to claim 6, characterized in that: The tightening mechanism (4) includes a screw (42) threaded through the adjusting seat (3), with a handle (41) fixed to one outer end of the screw (42) and a pressure plate (43) rotatably connected to one inner end of the screw (42).

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