Numerical control machining fixture for thin-walled aluminum alloy parts

Abstract

The utility model relates to processing fixture technical field, concretely for a kind of numerical control processing fixture for thin-walled aluminum alloy parts, including workbench, clamping mechanism is arranged on the workbench, bearing entire clamping mechanism, the clamping mechanism includes: vertical support frame, vertical support frame is fixedly connected on workbench, fixedly connected with step motor on vertical support frame, the output shaft of step motor is fixedly connected with Y type clamp, Y type clamp is symmetrically connected with support arm, right side support arm is fixedly connected with hollow input pipe, for input and output high-pressure air.The utility model is provided with clamping mechanism, utilizes air pressure pump control high-pressure air drive sealing column and clamping block to realize accurate clamping to thin-walled aluminum alloy parts, and position stability is ensured by the locking mechanism of conical convex block and tooth type groove, avoid air pressure too big and lead to part deformation, improve the precision and stability of clamping.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, specifically a CNC machining fixture for thin-walled aluminum alloy parts. Background Technology

[0002] A CNC machining fixture is a workpiece fixing device used in the CNC machine tool machining process. It mainly uses a specific mechanical structure to ensure that the workpiece maintains a stable position and posture during the machining process.

[0003] Existing CNC machining fixtures typically employ mechanical or hydraulic clamping methods when handling thin-walled aluminum alloy parts. These methods often struggle to achieve precise clamping of the parts and are prone to positional deviation or instability due to improper clamping force control. Especially under high-pressure drive, improper adjustment can cause excessive pressure, leading to deformation of the thin-walled parts and affecting machining accuracy and stability.

[0004] In view of this, we propose a CNC machining fixture for thin-walled aluminum alloy parts. Utility Model Content

[0005] The purpose of this utility model is to provide a CNC machining fixture for thin-walled aluminum alloy parts. This CNC machining fixture for thin-walled aluminum alloy parts solves the problem that when existing CNC machining fixtures process thin-walled aluminum alloy parts, improper control of mechanical or hydraulic clamping force can easily lead to positional deviation, instability, and deformation of thin-walled parts, affecting machining accuracy and stability.

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

[0007] A CNC machining fixture for thin-walled aluminum alloy parts includes a worktable with a clamping mechanism supporting it. The clamping mechanism includes a vertical support frame fixedly connected to the worktable, a stepper motor fixedly connected to the vertical support frame, a Y-shaped clamp fixedly connected to the output shaft of the stepper motor, and symmetrical support arms connected to the Y-shaped clamp. A hollow input pipe is fixedly connected to the right support arm for inputting and outputting high-pressure air, and a side hollow support column is fixedly connected to the left support arm. A U-shaped tube connects the side hollow support column to the hollow input pipe. Hollow output tubes are fixedly connected to the inner sides of both ends of the U-shaped tube. A sealing column is piston-connected to the inner wall of the hollow output tube. A clamping block is fixedly connected to one end of the sealing column, and a square block is fixedly connected to the other end of the sealing column. A hollow groove is formed on the inner wall of the square block, and the hollow groove communicates with the inner wall of the hollow output tube. A conical protrusion is piston-connected to the inner wall of the hollow groove. A support spring is connected between the conical protrusion and the inner wall of the hollow groove. A hollow output tube is formed on the inner wall of the hollow output tube. A display mechanism is connected to the end of the side hollow support column away from the U-shaped tube to display the air pressure inside the U-shaped tube.

[0008] Preferably, the workbench is equipped with a conveyor belt for transporting aluminum alloy parts.

[0009] Preferably, a pneumatic pump is fixedly connected to the end of the hollow input pipe away from the U-shaped pipe for inputting and outputting air.

[0010] Preferably, the square block is slidably connected to the inner wall of the hollow output pipe to support the stable reciprocating movement of the sealing column.

[0011] Preferably, the display mechanism includes a transparent tube, which is fixedly connected to the end of the side hollow support column away from the U-shaped tube. The outer wall of the transparent tube is provided with a scale, and a sealing cylindrical block is piston-connected to the inner wall of the transparent tube. A return spring is connected between the sealing cylindrical block and the inner wall of the transparent tube. A connecting groove is opened on the side of the transparent tube near the side hollow support column for connecting the transparent tube with the U-shaped tube.

[0012] Preferably, the outer surface of the transparent tube is provided with a wear-resistant protective layer, which covers the outer peripheral surface and both end faces of the transparent tube to reduce scratches caused by friction or collision.

[0013] Preferably, the connection between the Y-shaped clamp and the support arm is provided with an adjustable locking component to facilitate the disassembly and installation of the support arm.

[0014] By employing the above technical solution, this utility model provides a CNC machining fixture for thin-walled aluminum alloy parts. It possesses at least the following beneficial effects:

[0015] 1. This utility model features a clamping mechanism that uses a pneumatic pump to control high-pressure air to drive the sealing column and clamping block to achieve precise clamping of thin-walled aluminum alloy parts. The locking mechanism of the conical protrusion and toothed groove ensures stable positioning, avoids deformation of parts due to excessive air pressure, and improves the accuracy and stability of clamping.

[0016] 2. This utility model incorporates a display mechanism that uses a transparent tube, a scale, and a sealed cylindrical block to display the air pressure inside the U-shaped tube in real time. This enables visual monitoring of the clamping force, ensuring that the air pressure reaches a preset threshold and does not exceed the load-bearing limit of the thin-walled part, thus guaranteeing processing accuracy and part integrity. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the conveyor belt structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the vertical support frame of this utility model;

[0021] Figure 4 This is a schematic diagram of the Y-shaped clip of this utility model;

[0022] Figure 5 This is a structural schematic diagram of the cross-section of the U-shaped tube portion of this utility model;

[0023] Figure 6 This is a structural schematic diagram of the cross-section of the hollow output tube of this utility model;

[0024] Figure 7 This utility model Figure 6 Enlarged structural diagram at point A;

[0025] Figure 8 This is a structural schematic diagram of the cross-section of the square block of this utility model;

[0026] Figure 9 This is a structural schematic diagram of the cross-section of the transparent tube of this utility model.

[0027] In the diagram: 1. Workbench; 2. Conveyor belt; 3. Clamping mechanism; 31. Vertical support frame; 32. Stepper motor; 33. Y-clamp; 34. Support arm; 35. Hollow input pipe; 36. U-shaped pipe; 37. Side hollow support column; 38. Hollow output pipe; 39. Sealing column; 310. Clamping block; 311. Hollow groove; 312. Conical protrusion block; 313. Toothed groove; 314. Air pump; 315. Square block; 316. Support spring; 4. Display mechanism; 41. Transparent tube; 42. Scale; 43. Sealing cylindrical block; 44. Return spring; 45. Connecting groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1 - Figure 9As shown, this utility model provides a technical solution: a CNC machining fixture for thin-walled aluminum alloy parts, including a worktable 1, on which a clamping mechanism 3 is provided to support the entire clamping mechanism 3. The clamping mechanism 3 includes: a vertical support frame 31, which is fixedly connected to the worktable 1; a stepper motor 32 is fixedly connected to the vertical support frame 31; a Y-shaped clamp 33 is fixedly connected to the output shaft of the stepper motor 32; support arms 34 are symmetrically connected to the Y-shaped clamp 33; a hollow input pipe 35 is fixedly connected to the right support arm 34 for inputting and outputting high-pressure air; and a side hollow support column 37 is fixedly connected to the left support arm 34. A connection is made between the side hollow support column 37 and the hollow input pipe 35. A U-shaped tube 36 has hollow output tubes 38 fixedly connected to the inner sides of both ends. A sealing post 39 is piston-connected to the inner wall of the hollow output tube 38. A clamping block 310 is fixedly connected to one end of the sealing post 39, and a square block 315 is fixedly connected to the other end. A hollow groove 311 is formed on the inner wall of the square block 315, communicating with the inner wall of the hollow output tube 38. A conical protrusion 312 is piston-connected to the inner wall of the hollow groove 311, and a supporting spring 316 connects the conical protrusion 312 and the inner wall of the hollow groove 311. A hollow output tube 38 is formed on the inner wall of the hollow output tube 38. High-pressure air generated by the air pump 314 enters the U-shaped tube 36 through the hollow input tube 35. Then, the air pressure enters the piston chamber formed by the sealing column 39 and the hollow output pipe 38 through the hollow output pipe 38. Air pressure acts on the end of the sealing column 39, pushing it to move the square block 315 in the clamping direction. At this time, the hollow groove 311 inside the square block 315 is connected to the hollow output pipe 38. Simultaneously, air pressure acts on the end face of the conical protrusion 312. When the thrust generated by the air pressure is greater than the sum of the preload of the supporting spring 316 and the frictional force between the conical protrusion 312 and the inner wall of the hollow groove 311, the conical protrusion 312 overcomes the spring force and moves towards the toothed groove 313 until its conical surface is engaged in the toothed groove 313 on the inner wall of the hollow output pipe 38, thus locking the position of the sealing column 39. The required air pressure threshold needs to be determined according to… The elastic coefficient k of the supporting spring 316, the compression amount x = pre-tightening compression amount + additional compression amount required to overcome friction, the effective pressure area S of the conical protrusion 312, and the coefficient of friction μ of the conical surface are calculated. Specifically, the air pressure P must satisfy P×S≥k×x+μ×N, where N is the normal pressure between the conical protrusion 312 and the toothed groove 313. This ensures that the clamping block 310 stably clamps the thin-walled part after the threshold is reached. Its technical significance is that by setting this air pressure condition, the clamping force can be precisely controlled, avoiding insufficient air pressure causing the conical protrusion 312 to fail to lock or excessive air pressure causing the thin-walled part to deform. The side hollow support column 37 is connected to a display mechanism 4 at the end away from the U-shaped tube 36 to display the air pressure inside the U-shaped tube 36.

[0030] In this embodiment, a conveyor belt 2 is provided on the workbench 1 for transporting aluminum alloy parts. The aluminum alloy parts are automatically transported by the conveyor belt 2, realizing the automatic feeding of the parts to be processed to the clamping mechanism 3 and the automatic unloading of the parts after processing. This reduces the intervention of manual loading and unloading, improves the continuity and automation of the processing process, and adapts to the batch production needs of CNC machining.

[0031] Furthermore, a pneumatic pump 314 is fixedly connected to the end of the hollow input pipe 35 away from the U-shaped pipe 36 for inputting and outputting air. The pneumatic pump 314 provides a pneumatic power source for the clamping mechanism 3. By controlling the input and output of high-pressure air through the pneumatic pump 314, the clamping block 310 is driven to clamp and release parts, thereby achieving precise control over the air pressure and on / off state of the clamping mechanism 3. This provides stable and controllable power for the clamping action and ensures that the clamping force is adjustable.

[0032] Furthermore, the square block 315 is slidably connected to the inner wall of the hollow output tube 38 to support the stable reciprocating movement of the sealing column 39. Through the sliding engagement between the square block 315 and the inner wall of the hollow output tube 38, the reciprocating movement of the sealing column 39 is guided and supported, limiting the radial displacement of the sealing column 39 during the movement process. This ensures that the sealing column 39 drives the clamping block 310 to move stably in a preset direction, avoiding inaccurate positioning or uneven clamping force of the clamping block 310 due to the shaking of the sealing column 39, and ensuring the accuracy and stability of clamping thin-walled aluminum alloy parts.

[0033] In addition, the display mechanism 4 includes a transparent tube 41, which is fixedly connected to the end of the side hollow support column 37 away from the U-shaped tube 36. A scale 42 is provided on the outer wall of the transparent tube 41, and a sealing cylindrical block 43 is piston-connected to the inner wall of the transparent tube 41. A return spring 44 is connected between the sealing cylindrical block 43 and the inner wall of the transparent tube 41. A connecting groove 45 is provided on the side of the transparent tube 41 near the side hollow support column 37 to connect the transparent tube 41 with the U-shaped tube 36. Pressure changes within the U-shaped tube 36 are transmitted to the connecting groove 45 through the side hollow support column 37. The connecting groove 45 serves as a pressure communication channel between the transparent tube 41 and the U-shaped tube 36, introducing pressure into the interior of the transparent tube 41. A sealed cavity is formed by a fixed connection on the side hollow support column 37. The sealing cylindrical block 43, which is piston-connected to the inner wall, slides along the axial direction of the transparent tube 41 under the action of air pressure thrust, overcoming the preload of the return spring 44. The return spring 44 balances the elastic force with the air pressure thrust to stabilize the sealing cylindrical block 43 at the displacement position corresponding to the air pressure. The scale 42 on the outer wall of the transparent tube 41 marks the corresponding scale of air pressure and displacement. By observing the position of the sealing cylindrical block 43 in the transparent tube 41, the real-time air pressure value in the U-shaped tube 36 can be read, realizing the visual monitoring of the air pressure clamping force of the clamping mechanism 3, ensuring that the air pressure reaches the preset threshold and does not exceed the bearing limit of the thin-walled part during processing, and ensuring clamping stability and part processing accuracy.

[0034] In addition, a wear-resistant protective layer is provided on the outer surface of the transparent tube 41, covering the outer circumference and end faces of the transparent tube 41, to reduce scratches caused by friction or impact and maintain transparency during long-term use. An adjustable locking component is provided at the connection between the Y-shaped clip 33 and the support arm 34 to facilitate the disassembly and installation of the support arm 34 and simplify the disassembly process.

[0035] In use, the CNC machining fixture for thin-walled aluminum alloy parts of this utility model employs a worktable 1 as the mounting base for the entire fixture, supporting all components. A conveyor belt 2 positioned above the worktable automatically transports the aluminum alloy parts to be processed to the area directly below the clamping mechanism 3, achieving automatic feeding and reducing manual intervention. The clamping mechanism 3 is fixed to the worktable 1 via a vertical support frame 31, which supports a stepper motor 32. The output shaft of the stepper motor 32 drives the Y-shaped clamp 33 to rotate, which in turn drives the symmetrically connected support arms 34 to adjust their angles, aligning the two support arms 34 with the clamping position of the part. (Right side...) The hollow input pipe 35 on the support arm 34 is connected to the air pressure pump 314. After the air pressure pump 314 is started, it inputs high-pressure air into the hollow input pipe 35. The high-pressure air enters the U-shaped pipe 36 through the hollow input pipe 35. The U-shaped pipe 36 splits the air pressure to the hollow output pipes 38 on both sides. The left side is connected to the U-shaped pipe 36 through the side hollow support column 37. The sealing column 39 in the hollow output pipe 38 moves along the inner wall under the action of air pressure. The sealing column 39 drives the clamping block 310 at its end to move closer to the part. At the same time, the square block 315 at the other end of the sealing column 39 moves synchronously with it. The hollow groove 311 on the inner wall of the square block 315 interacts with the central part. The air output pipe 38 is connected, and the air pressure acts synchronously on the end face of the conical protrusion 312 in the hollow groove 311. When the air pressure reaches the preset threshold, the conical protrusion 312 overcomes the preload and friction of the support spring 316 and moves towards the toothed groove 313. Its conical surface is engaged in the toothed groove 313 on the inner wall of the hollow output pipe 38, thereby locking the position of the sealing column 39 and making the clamping block 310 stably clamp the thin-walled part, preventing excessive air pressure from continuing to drive the clamping block (310) to apply pressure. At this time, the display mechanism 4 connected to the end of the side hollow support column 37 away from the U-shaped tube 36 starts to work, and the air pressure in the U-shaped tube 36 is transferred through the side hollow support column. The column 37 enters the transparent tube 41 through the connecting groove 45, pushing the sealing cylindrical block 43 inside the transparent tube 41 to move axially against the elastic force of the return spring 44. The position of the sealing cylindrical block 43 corresponds to the air pressure value on the scale 42 on the outer wall of the transparent tube 41, realizing visual monitoring of air pressure. After processing, the air pressure pump 314 stops inputting high-pressure air and outputs air to release pressure. The air pressure in the U-shaped tube 36 decreases, and the conical protrusion 312 exits the toothed groove 313 under the action of the support spring 316. The sealing column 39 drives the clamping block 310 to move back and release the part. The conveyor belt 2 automatically transmits the processed part, completing the entire processing cycle.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC machining fixture for thin-walled aluminum alloy parts, comprising a worktable (1), characterized in that: The workbench (1) is provided with a clamping mechanism (3) to support the entire clamping mechanism (3). The clamping mechanism (3) includes: A vertical support frame (31) is fixedly connected to the workbench (1). A stepper motor (32) is fixedly connected to the vertical support frame (31). A Y-clamp (33) is fixedly connected to the output shaft of the stepper motor (32). Support arms (34) are symmetrically connected to the Y-clamp (33). A hollow input pipe (35) is fixedly connected to the right support arm (34) for inputting and outputting high-pressure air. A side hollow support column (37) is fixedly connected to the left support arm (34). A U-shaped tube (36) is connected between the side hollow support column (37) and the hollow input pipe (35). Hollow output pipes are fixedly connected to the inner sides of both ends of the U-shaped tube (36). The hollow output tube (38) has a piston-connected sealing column (39) on its inner wall. One end of the sealing column (39) is fixedly connected to a clamping block (310), and the other end of the sealing column (39) is fixedly connected to a square block (315). A hollow groove (311) is provided on the inner wall of the square block (315). The hollow groove (311) is connected to the inner wall of the hollow output tube (38). A conical protrusion (312) is piston-connected on the inner wall of the hollow groove (311). A support spring (316) is connected between the conical protrusion (312) and the inner wall of the hollow groove (311). A hollow output tube (38) is provided on the inner wall of the hollow output tube (38). The side hollow support column (37) is connected to a display mechanism (4) at the end away from the U-shaped tube (36) to display the air pressure inside the U-shaped tube (36).

2. The CNC machining fixture for thin-walled aluminum alloy parts according to claim 1, characterized in that: The workbench (1) is equipped with a conveyor belt (2) for transporting aluminum alloy parts.

3. A CNC machining fixture for thin-walled aluminum alloy parts according to claim 1, characterized in that: The hollow input pipe (35) is fixedly connected to a pneumatic pump (314) at the end away from the U-shaped pipe (36) for inputting and outputting air.

4. A CNC machining fixture for thin-walled aluminum alloy parts according to claim 1, characterized in that: The square block (315) is slidably connected to the inner wall of the hollow output pipe (38) to support the stable reciprocating movement of the sealing column (39).

5. A CNC machining fixture for thin-walled aluminum alloy parts according to claim 1, characterized in that: The display mechanism (4) includes a transparent tube (41), which is fixedly connected to the end of the side hollow support column (37) away from the U-shaped tube (36). The outer wall of the transparent tube (41) is provided with a scale (42). A sealing cylindrical block (43) is piston-connected to the inner wall of the transparent tube (41). A return spring (44) is connected between the sealing cylindrical block (43) and the inner wall of the transparent tube (41). A connecting groove (45) is opened on the side of the transparent tube (41) near the side hollow support column (37) for connecting the transparent tube (41) and the U-shaped tube (36).

6. A CNC machining fixture for thin-walled aluminum alloy parts according to claim 5, characterized in that: The outer surface of the transparent tube (41) is provided with a wear-resistant protective layer, which covers the outer peripheral surface and the end faces of both ends of the transparent tube (41) to reduce scratches caused by friction or collision.

7. A CNC machining fixture for thin-walled aluminum alloy parts according to claim 1, characterized in that: An adjustable locking assembly is provided at the connection between the Y-shaped clamp (33) and the support arm (34) to facilitate the disassembly and installation of the support arm (34).

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