Pressing device for vacuum chuck

Abstract

The utility model relates to a pressing device for a vacuum chuck, and belongs to the technical field of machining clamp tools. Comprising a neodymium iron boron strong magnetic suction cup, an auxiliary spring, a screw rod, a pressing plate and a rotating shaft, and the pressing plate can swing around the rotating shaft; the screw penetrates through the auxiliary spring and is screwed on the neodymium iron boron suction cup, and the other end of the screw penetrates through the pressing plate and the rotating shaft and is rotationally locked through the arc-shaped gasket and the locking nut. The pressing device designed by the utility model can be placed at any position on the vacuum chuck according to the requirements of workpieces and can realize flexible switching of pressing of aluminum alloy plates with different thicknesses.

Description

Technical Field

[0001] This utility model belongs to the field of machining fixtures and tooling technology, specifically relating to a clamping device for vacuum suction cups. Background Technology

[0002] In the processing of aluminum alloy sheets, traditional vacuum chucks typically employ blanking, where the workpiece is separated from the blank through contour milling. However, this method has the following technical drawbacks: First, there is the problem of residual burrs. To prevent workpiece deformation or detachment during milling, a margin of 0.10–0.15 mm is usually left on the bottom surface, resulting in relatively thick residual burrs. Subsequent manual grinding or secondary processing is required to remove these burrs, consuming significant auxiliary time and increasing labor costs. Furthermore, since the burr removal process involves mechanical forces (such as filing or grinding), it can easily lead to localized deformation of the workpiece, affecting dimensional accuracy and surface quality. Second, there is the issue of stability during processing. Aluminum alloy sheets are prone to warping under the influence of cutting forces and thermal deformation, leading to localized air leakage from the vacuum chuck and a decrease in suction force.

[0003] To address the aforementioned issues, some technical solutions integrate mechanical clamping devices into vacuum chucks, such as those with threaded holes around the perimeter and bolts connecting to a pressure plate. However, most standard chucks do not have pre-installed threaded holes, requiring post-installation modifications and increasing manufacturing costs. Even when threaded holes are designed, their spacing (e.g., M6 / M8 standard hole spacing) may not match the clamping requirements of workpieces of different sizes. In summary, existing vacuum chucks' mechanical clamping devices, due to their fixed structure and non-adjustable position, cannot flexibly adjust the clamping points according to the workpiece shape and size, resulting in uneven clamping force distribution and difficulty in balancing stable clamping with machining accuracy. Therefore, it is difficult to achieve a complete solution to the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a clamping device that can be freely positioned on a vacuum chuck according to the needs of the workpiece, thus solving the problem that it is difficult to install a clamping device on an existing vacuum chuck.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, this utility model provides a clamping device for vacuum suction cups. The clamping device includes: a neodymium iron boron suction cup assist spring screw plate and a rotating shaft; one end of the screw passes through the assist spring and is screwed onto the neodymium iron boron suction cup, and the other end of the screw passes through the rotating shaft of the pressure plate and is locked.

[0008] Preferably, the pressure plate has a through groove in the middle, and the rotating shaft passes through the groove and is connected to the pressure plate, so that the pressure plate can rotate around the rotating shaft.

[0009] Preferably, the clamping device further includes an arc-shaped washer and a locking nut, and the other end of the screw passes through the rotating shaft of the pressure plate and is then rotated and locked by the arc-shaped washer and the locking nut.

[0010] Preferably, the pressure plate has an opening in the middle of the groove, and U-shaped notches are provided at the connection between the opening and the pressure plate on the left and right sides. The shape and size of the opening and the U-shaped notches are adapted to the arc-shaped washer, and the depth of the U-shaped notches is adapted to the swing angle.

[0011] Preferably, the pressure plate extends downwards on both sides of the groove as the center, with pressure plates gradually thinning at the front ends to form downwardly angled ends.

[0012] Preferably, the horizontal cross-section of the pressure plate on one side that contacts the vacuum suction cup is rectangular, and the horizontal cross-section of the pressure plate on the other side is U-shaped, so that the two tentacles contact and press the workpiece.

[0013] Preferably, the front ends of the pressure plates on both sides of the pressure plate are arc surfaces.

[0014] Preferably, the arc-shaped washer has semi-circular notches on both sides that match the curvature of the rotating shaft, and the arc-shaped washer is secured to the rotating shaft through the semi-circular notches on both sides.

[0015] Preferably, the present invention also provides a machining fixture, including the aforementioned device.

[0016] Preferably, the tooling further includes a vacuum suction cup, and the clamping device is distributed at any position on the vacuum suction cup.

[0017] (III) Beneficial Effects

[0018] This utility model provides a clamping device for vacuum suction cups, which has the following advantages:

[0019] 1. The clamping device based on the neodymium iron boron strong magnetic chuck design can achieve flexible adsorption in any area of ​​the vacuum chuck table, making it easier to install.

[0020] 2. The structural design of the slide and rotating shaft enables flexible switching of pressing aluminum alloy plates of different thicknesses.

[0021] 3. The design of the pressure plate can enhance the stability of workpiece clamping.

[0022] 4. The device uses a "one suction and one pressure" process to fasten the workpiece. Because the position is flexible and the clamping is strong, the clamping force and thickness can also be flexibly switched. Even if air leakage occurs due to workpiece deformation, the workpiece will not shift. Therefore, it can improve the safety and reliability of the processing process. At the same time, it can effectively reduce the thickness of residual burrs on the bottom surface of the aluminum plate, optimize the burr removal effect of parts, and reduce labor and time costs. Attached Figure Description

[0023] Figure 1 This is an exploded view of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 3 This is a schematic diagram illustrating the application of this utility model in a real-world scenario;

[0026] Figure label:

[0027] 101-NdFeB strong magnetic chuck; 102-Assist spring; 103-Screw; 104-Pressure plate; 105-Rotating shaft; 106-Arc washer; 107-Locking nut; 108-Slide groove; 301-Vacuum chuck; 302-Workpiece to be processed; 303-Pneumatic gauge; 304-Inlet valve; 305-Clamping device. Detailed Implementation

[0028] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0029] like Figure 1 As shown, this utility model includes a neodymium iron boron strong magnetic chuck 101 with super strong attraction, an assist spring 102, a screw 103, a pressure plate 104, a rotating shaft 105, an arc-shaped washer 106, and a locking nut 107; the screw 103 passes through the assist spring 102 and is screwed onto the neodymium iron boron chuck 101, and the other end of the screw 103 passes through the pressure plate 104 and the rotating shaft 105, and is rotated and locked by the arc-shaped washer 106 and the locking nut 107.

[0030] The pressure plate 104 includes a groove 108 and two pressure plates on both sides. The pressure plate 104 has a through groove 108 running from front to back in the middle. The upper center of the groove 108 has an opening, the shape and size of which are adapted to the arc-shaped washer 106. U-shaped notches are provided on the left and right sides of the opening, the depth of which is adapted to the swing angle. For example... Figure 2 As shown, the rotating shaft 105 passes through the slide groove 108 and is connected to the pressure plate 104. The rotating shaft 105 and the pressure plate 104 are coaxial. The pressure plate 104 can swing around the rotating shaft 105 through the slide groove 108, thereby achieving a certain angle adjustment according to the thickness of the workpiece.

[0031] The pressure plate 104 extends downwards at an angle from the sliding groove 108 on both sides. The front ends of the pressure plates gradually thin out and form downward-facing ends. The horizontal cross-section of the pressure plate at the end that contacts the vacuum chuck is rectangular, while the horizontal cross-section of the pressure plate at the other end (the end that contacts the workpiece) is U-shaped. The pressure plate at the end that contacts the workpiece enhances the stability of workpiece clamping by reducing the contact area and increasing the pressure. Furthermore, the extended area of ​​the pressure plate at the end that contacts the workpiece is larger than that at the other end, thus making the arrangement of pressure points and pressure distribution more uniform when multiple clamping devices are used simultaneously. The front ends of the pressure plates on both sides are arc-shaped, ensuring that the front ends of the pressure plates can make stable and smooth contact with the vacuum chuck and the workpiece surface at any angle.

[0032] In addition, the semi-circular notch at the lower end of the arc-shaped washer 106 is consistent with the curvature of the rotating shaft, which can be locked onto the rotating shaft, making the pressure distribution more uniform when the locking nut tightens the pressure plate.

[0033] like Figure 3 As shown, when using this device, the workpiece 302 to be processed (an aluminum plate part in this embodiment) is first placed on the vacuum suction cup 301. The vacuum pump of the vacuum suction cup 301 is turned on (the air inlet valve 304 is closed, and the air pressure instrument 303 displays the air pressure) to adsorb the workpiece 302. Then, according to the processing requirements, the clamping devices 305 are reasonably distributed around the edges of the workpiece 302. Through the neodymium iron boron strong magnetic suction cup 101, the clamping devices 305 can flexibly adsorb and fix any position of the vacuum suction cup 301. One end of the pressure plate is close to the surface of the vacuum suction cup 301, and the other end is close to the upper surface of the workpiece 302. The locking nut is rotated until the aluminum plate part that has been vacuum adsorbed is further locked, making the tightness of the aluminum plate part more secure and reliable.

[0034] After the workpiece 302 is secured using the clamping device of this invention, most of the excess material of the aluminum plate part is removed by a cutting tool during the processing of the workpiece 302, leaving a bottom surface allowance of 0.10-0.15mm. Finally, contour milling is performed, with the cutting tool end face processing the remaining residual material at a position 0.03-0.05mm from the upper surface of the vacuum chuck. Due to the use of the clamping device of this invention, even if air leakage occurs due to workpiece deformation, workpiece displacement will not occur, improving the safety and reliability of the processing process. At the same time, it effectively reduces the thickness of residual burrs on the bottom surface of the aluminum plate, optimizes the burr removal effect of the parts, and reduces labor costs.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A clamping device for a vacuum suction cup, characterized in that, The clamping device includes: a neodymium iron boron chuck (101), a booster spring (102), a screw (103), a pressure plate (104), and a rotating shaft (105). The pressure plate (104) can swing around the rotating shaft (105). One end of the screw (103) passes through the booster spring (102) and is screwed onto the neodymium iron boron chuck (101). The other end of the screw (103) passes through the pressure plate (104) and the rotating shaft (105) and is locked.

2. The clamping device for a vacuum suction cup as described in claim 1, characterized in that: The pressure plate (104) has a through groove (108) in the middle, and the rotating shaft (105) passes through the groove (108) and is connected to the pressure plate (104).

3. The clamping device for a vacuum suction cup as described in claim 1, characterized in that: The clamping device also includes an arc-shaped washer (106) and a locking nut (107). The other end of the screw (103) passes through the pressure plate (104) and the rotating shaft (105), and is then rotated and locked by the arc-shaped washer (106) and the locking nut (107).

4. The clamping device for a vacuum suction cup as described in claim 3, characterized in that: The pressure plate (104) has an opening in the middle of the groove (108). The opening is connected to the pressure plate (104) on both sides with U-shaped notches. The shape and size of the opening are adapted to the arc washer (106). The depth of the U-shaped notch is adapted to the swing angle.

5. The clamping device for a vacuum suction cup as described in claim 2, characterized in that: The pressure plate (104) extends downwards on both sides of the slide groove (108) with pressure plates gradually thinning at the front end and forming an angled downward-facing end.

6. The clamping device for a vacuum suction cup as described in claim 5, characterized in that: The horizontal cross-section of the pressure plate (104) that contacts the vacuum suction cup is rectangular, and the horizontal cross-section of the pressure plate on the other side is U-shaped, forming two tentacles that contact and press the workpiece.

7. The clamping device for a vacuum suction cup as described in claim 5 or 6, characterized in that: The front ends of the pressure plates on both sides of the pressure plate (104) are curved.

8. The clamping device for a vacuum suction cup as described in claim 3, characterized in that: The arc-shaped washer (106) has semi-circular notches on both sides that match the curvature of the rotating shaft (105). The arc-shaped washer (106) is secured to the rotating shaft (105) through the semi-circular notches on both sides.

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