CNC (computer numerical control) machining jig with ejection suction cup

Abstract

The CNC machining jig comprises a clamping jig and a side pushing device which are fixed to a machine table, the clamping jig can adsorb and release a workpiece in a vacuum mode, the side pushing device is arranged on one side of the side pushing device and provided with the suction cup, the suction cup abuts against the weak area of the workpiece in a pushing mode in the machining stage, and after machining is completed, the clamping jig relieves vacuum, and then the workpiece is clamped in the clamping jig. The sucker is switched into a negative pressure adsorption state, and the workpiece is automatically taken away from the jig; therefore, manual stripping is not needed, the risks of collision, scratching and deformation are remarkably reduced, the machining precision and the material taking safety are both considered, the device is suitable for efficient automatic production of thin-wall metal pieces such as 3C products, and the yield and the operation reliability are effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of machining fixtures, specifically to the technical field of CNC machining fixtures with a top suction cup. Background Technology

[0002] In the current CNC precision machining of workpieces (such as housings) for 3C products (such as smartphones and tablets), to meet the trend of thinner and lighter designs, housing parts generally adopt thin-walled structures such as aluminum and magnesium alloys. When machining side holes, these workpieces are often fixed to a flat fixture using a vacuum suction method.

[0003] However, due to insufficient local rigidity of the workpiece, it is very easy for the cutting force to cause slight vibration or elastic deformation during the milling process, resulting in machining defects such as "tool bounce", over-milling, and out-of-tolerance position, which seriously affect dimensional accuracy and yield.

[0004] In addition, existing processes still rely on manual material handling after processing, requiring operators to manually peel the vacuum-adsorbed workpieces from the fixture. This process is not only inefficient, but also prone to causing surface scratches, edge curling, or overall deformation of the workpiece due to uneven force application or improper clamping.

[0005] To address this issue, existing technologies enhance rigidity by adding mechanical limit blocks, but these have a fixed structure, cannot adapt to different workpiece contours, and cannot solve the problem of material handling damage. Another solution involves using an external robotic arm for gripping, but this is costly, slow, and difficult to integrate within the confined space of a CNC machine.

[0006] Therefore, there is an urgent need for an integrated solution that can provide support during processing to suppress deformation and automatically complete non-destructive material removal after processing. Utility Model Content

[0007] This application proposes a CNC machining fixture with a top suction cup, which improves machining stability and material handling safety by pressing against the workpiece during machining and adsorbing the workpiece after machining.

[0008] To achieve the above objectives, the present application adopts the following technical solution:

[0009] This application proposes a CNC machining fixture with a top suction cup, including a clamping fixture fixedly mounted on a machine base and capable of vacuum suction and release of workpieces. A side push device fixed on the machine base is provided at intervals on one side of the clamping fixture where the workpiece is suctioned, and the side push device is equipped with a suction cup.

[0010] The suction cup is configured to press against the workpiece when the clamping fixture vacuum adsorbs the workpiece, and after the clamping fixture releases the vacuum adsorption force, it adsorbs the workpiece by negative pressure and drives it to detach from the clamping fixture.

[0011] Thus, by installing a side-pushing device with a suction cup on one side of the clamping fixture, the suction cup acts as a mechanical pusher during the machining stage, pressing against the weak areas of the workpiece to effectively suppress cutting vibration and deformation, avoiding over-milling and positional errors. During the unloading stage, it switches to a negative pressure adsorption state, automatically removing the workpiece from the fixture without manual removal, significantly reducing the risk of scratches and deformation caused by operational errors, and effectively improving workpiece yield and automation level.

[0012] In some possible implementations, the suction cup is connected to a solenoid valve via an air passage. The solenoid valve is configured to be in an open state when the suction cup is pressed against the workpiece, and in a normally closed state when the suction cup is adsorbing the workpiece, so as to form a closed negative pressure chamber.

[0013] In some possible implementations, the side-pushing device includes a base, a bracket, and a cylinder mounted on the bracket, the cylinder driving the suction cup to reciprocate in a horizontal direction.

[0014] In some possible implementations, a valve body mounting base connected to the cylinder is also included, the solenoid valve is mounted on the valve body mounting base, the cylinder is provided with a reciprocating piston, and the valve body mounting base is fixedly connected to the piston of the cylinder.

[0015] In some possible implementations, there are two suction cups, one on each side of the valve body mounting base.

[0016] In some possible implementations, the clamping fixture includes a mounting base plate, a back plate, and a positioning sleeve for positioning the workpiece.

[0017] In some possible implementations, the upper surface of the positioning sleeve is provided with a vacuum adsorption groove, and the vacuum adsorption groove is provided with a vacuum hole for introducing negative pressure.

[0018] In some possible implementations, the back panel has a machined area recessed into the outer periphery of the positioning sleeve.

[0019] In some possible implementations, a plurality of adjusting blocks are disposed on the outer periphery of the positioning sleeve, the adjusting blocks being provided with adjusting grooves.

[0020] In some possible implementations, the clamping fixture is further provided with positioning pin holes. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of the machine tool equipped with a CNC machining fixture with a top suction cup, as described in this application;

[0022] Figure 2 This is an internal view of the machine tool in this application;

[0023] Figure 3This is a schematic diagram of the workpiece machining state of the CNC machining fixture with top suction cup in this application;

[0024] Figure 4 This is a schematic diagram of the side thrust device in this application;

[0025] Figure 5 This is a schematic diagram of the clamping fixture in this application;

[0026] Figure 6 yes Figure 5 A magnified view of a portion of point A in the middle. Detailed Implementation

[0027] The following examples further illustrate the features of this application and other related features in detail, so as to facilitate understanding by those skilled in the art:

[0028] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions in the attached diagrams, while the terms “bottom surface,” “top surface,” “inner,” and “outer” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0029] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this case based on the specific circumstances.

[0030] Please refer to Figures 1 to 3 The CNC machining fixture with a top suction cup described in this application is suitable for precision machining of side holes in typical thin-walled metal shell workpieces 100 used in 3C products. The workpiece 100 can be an aluminum / magnesium alloy back cover for a smartphone or tablet, which is thin and lightweight with weak local rigidity, making it prone to vibration or elastic deformation due to cutting forces during high-speed milling. The machine tool 200 is a standard CNC machining equipment platform used to fix and clamp the fixture 1 and the side push device 2; the CNC machining equipment platform itself is a standard configuration in the prior art.

[0031] Specifically, the CNC machining fixture with top suction cup of this application is mounted on the machine tool 200, mainly including a clamping fixture 1 for adsorbing and releasing the workpiece 100, and a side-pushing device 2 disposed on one side of the workpiece 100. The two are arranged horizontally at intervals in space to ensure that the movement of the side-pushing device 2 does not interfere with the tool path, while it can accurately act on the weak area of ​​the workpiece 100.

[0032] Specifically, for the clamping fixture 1, see Figure 5 and Figure 6 The fixture includes a mounting base plate 11, a back plate 12, and a positioning sleeve 13. The mounting base plate 11 is fixed to the machine tool 200, serving as the basic support for the entire fixture. The back plate 12 is vertically connected above the mounting base plate 11, and its side facing the workpiece 100 has an inwardly recessed processing area 121, providing sufficient clearance for the cutting tool. The positioning sleeve 13 is located in front of the back plate 12, and its outer contour matches the inner edge of the workpiece 100, used to position the workpiece 100. A vacuum adsorption groove 14 is formed on the upper surface of the positioning sleeve 13, which is connected to a vacuum hole 141 and connected to an external vacuum source through an air pipe. This creates negative pressure during processing, firmly adsorbing the workpiece 100 onto the surface of the fixture 1.

[0033] Furthermore, to accommodate the dimensional tolerances of different workpiece models 100, the outer periphery of the positioning sleeve 13 is provided with multiple adjusting blocks 15, each adjusting block 15 having an adjusting groove 151 extending radially. By tightening or loosening the fixing screws, the position of the adjusting block 15 can be finely adjusted within the adjusting groove 151, thereby achieving adaptability to the workpiece 100 and improving clamping versatility.

[0034] In addition, the clamping fixture 1 is provided with several locating pin holes 16 for installing locating pins (not shown in the figure) to mate with the process holes on the workpiece 100 to ensure consistent positioning during repeated clamping. Below the locating pins, there is usually an auxiliary support plate 17, which, along with the back plate 12, is positioned rearward to support the locating pins.

[0035] For side thruster 2, please refer to... Figure 3 and Figure 4 The side-pushing device 2 is fixed on the machine base 200 and located on the side where the clamping fixture 1 adsorbs the workpiece 100. The device includes a base 21, a bracket 22 mounted on the base 21, and a cylinder 23 mounted on the bracket 22. In some embodiments, the bracket 22 may be designed to be height-adjustable relative to the base 21, specifically through multiple positioning holes, allowing for pre-adjustment of the height before operation.

[0036] The cylinder 23 is equipped with a piston that can extend horizontally, and a valve body mounting base 241 is fixedly connected to its end. The solenoid valve 24 is directly mounted on the valve body mounting base 241, with its inlet connected to an external compressed air source and its exhaust port connected to the suction cup 25 via an internal air passage. In some preferred embodiments, the solenoid valve 24 can be adjusted left or right relative to the valve body mounting base 241, that is, the distance between the two suction cups 25 can be adjusted. This can be achieved by controlling the clamping distance of the solenoid valve 24 or by using a separate retractable clamping device. This is a common industry technique and will not be illustrated further.

[0037] Preferably, there are two suction cups 25, symmetrically arranged on both sides of the valve body mounting base 241, to ensure balanced adsorption force and prevent the workpiece 100 from deflecting or tilting during detachment. The adsorption surface of the suction cup 25 is made of flexible silicone material, which can well fit the surface of the workpiece 100 and form an effective seal.

[0038] In actual operation, the workpiece 100 is placed in the positioning sleeve 13 of the clamping fixture 1. The vacuum system is activated, creating negative pressure in the vacuum adsorption tank 14 through the vacuum hole 141, firmly adsorbing the workpiece 100. At this time, the cylinder 23 of the side-pushing device 2 drives the piston to extend, moving the suction cup 25 forward until its front end presses against the weak area of ​​the side wall of the workpiece 100. During this process, the solenoid valve 24 is in the normally open state, allowing the inside of the suction cup 25 to communicate with the atmosphere, expelling the gas in the cavity, and only playing the role of pushing and pressing against the workpiece 100. During the pressing process, the local rigidity of the workpiece 100 in the cutting direction is improved, effectively suppressing defects such as "tool bounce", over-milling, and positional errors.

[0039] After CNC machining is completed, the main vacuum system is shut off, and workpiece 100 is no longer held by clamping fixture 1. At this time, solenoid valve 24 is normally closed, cutting off the passage between suction cup 25 and the atmosphere, forming a sealed cavity inside. Since the gas inside the cavity was squeezed out during the previous process of suction cup 25 pressing against the workpiece, the internal air pressure is lower than atmospheric pressure, and workpiece 100 is automatically adsorbed onto the surface of suction cup 25 under atmospheric pressure. Subsequently, cylinder 23 drives the piston to retract, causing suction cup 25 and the adsorbed workpiece 100 to smoothly detach from clamping fixture 1. At this time, solenoid valve 24 is normally open again, suction cup 25 is vented to the atmosphere, and adsorption is released. The operator only needs to remove workpiece 100 from a safe position without manual peeling, completely avoiding surface scratches, edge curling, or overall deformation caused by forced prying.

[0040] Thus, by integrating the suction cup 25 into the movable side-pushing device 2, this application combines the mechanical support function during the processing stage with the passive adsorption function during the material handling stage. This eliminates the need for an additional vacuum pump or complex robotic arm, resulting in a simple structure, rapid response, and precise control. The entire solution is easily integrated into a confined CNC chamber, offering low cost and fast cycle time. It effectively solves the dual pain points of unstable processing and easy damage during material handling in existing technologies, significantly improving workpiece yield and automation levels.

[0041] As stated above, this case protects a CNC machining fixture with a top suction cup, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A CNC machining jig with a top material suction chuck, characterized by, The utility model relates to a vacuum adsorption and release workpiece (100) clamping fixture (1) is fixedly installed on the machine table (200) and can, one side interval of the clamping fixture (1) adsorbing workpiece (100) is provided with the side push device (2) fixedly installed on the machine table (200), and the side push device (2) is equipped with suction cup (25). The suction cup (25) is configured to abut against the workpiece (100) when the clamping fixture (1) is vacuum adsorbed, and to adsorb the workpiece (100) by negative pressure and drive it to separate from the clamping fixture (1) after the clamping fixture (1) releases the vacuum adsorption force. The suction cup (25) is communicated with the electromagnetic valve (24) through the gas circuit, and the electromagnetic valve (24) is configured to be in the normally open state when the suction cup (25) abuts against the workpiece (100), and to be in the normally closed state to form a sealed negative pressure cavity when the suction cup (25) adsorbs the workpiece (100).

2. The CNC machining jig with a top material suction chuck according to claim 1, characterized in that, The side push device (2) includes a base (21), a bracket (22), and a gas cylinder (23) provided on the bracket (22), and the gas cylinder (23) drives the suction cup (25) to reciprocate along the horizontal direction.

3. The CNC machining jig with a top material suction chuck according to claim 2, characterized in that, Further comprising a valve body mounting seat (241) connected with the gas cylinder (23), the electromagnetic valve (24) is installed on the valve body mounting seat (241), the gas cylinder (23) is provided with a reciprocable piston, and the valve body mounting seat (241) is fixedly connected with the piston of the gas cylinder (23).

4. The CNC machining jig with a top material suction chuck according to claim 3, characterized in that, The number of the suction cup (25) is two, which are respectively arranged on both sides of the valve body mounting seat (241).

5. The CNC machining jig with a top material suction chuck according to claim 4, characterized in that, The clamping fixture (1) includes a mounting base plate (11), a back plate (12), and a positioning sleeve plate (13) for positioning the workpiece (100).

6. The CNC machining jig with a top material suction chuck according to claim 1, wherein, The upper surface of the positioning sleeve plate (13) is provided with a vacuum adsorption groove (14), and the vacuum adsorption groove (14) is provided with a vacuum hole (141) for introducing negative pressure.

7. The CNC machining jig with a top material suction chuck according to claim 6, characterized in that, The back plate (12) is provided with a machining area (121) recessed outwardly from the outer periphery of the positioning sleeve plate (13).

8. The CNC machining jig with a top material suction chuck according to claim 6, characterized in that, Further comprising a plurality of adjusting blocks (15) arranged on the outer periphery of the positioning sleeve plate (13), and the adjusting block (15) is provided with an adjusting groove (151).

9. The CNC machining jig with a top material suction chuck according to claim 6, characterized in that, The clamping fixture (1) is further provided with a positioning pin hole (16).

10. The CNC machining jig with a top material suction chuck according to claim 1, characterized in that, ​

Images