Positioning tool for numerical control milling machine

Abstract

The utility model discloses a positioning tool for a numerical control milling machine. The positioning tool comprises a shell and a limiting mechanism. A limiting mechanism is movably mounted in the shell, limiting plates are movably mounted on the two sides of the limiting mechanism, and reinforcing structures are arranged on the tops of the limiting plates; the reinforcing structure comprises a reinforcing plate, a second spring, a movable plate, a clamping column and a top plate. By arranging a reinforcing structure, when a limiting plate clamps a workpiece, a movable plate firstly makes contact with the workpiece and slides towards the interior of the limiting plate, so that a top plate loses support, a reinforcing plate overturns under the contraction force of a second spring, the two sides of the workpiece are pressed, the vertical limiting effect is achieved, meanwhile, a clamping block slides into a clamping groove along with overturning, and the workpiece is clamped in the clamping groove. The positioning tool for the numerical control milling machine has the beneficial effects that the reinforcing effect on the reinforcing plate is achieved, and the limiting stability is enhanced, so that the positioning tool for the numerical control milling machine achieves transverse and vertical limiting at the same time, the clamping force is improved, displacement of a workpiece in the machining process is avoided, and the machining precision is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of CNC milling machine technology, and in particular to a positioning fixture for CNC milling machines. Background Technology

[0002] Positioning fixtures for CNC milling machines, also known as tooling fixtures, are indispensable auxiliary tools in CNC milling machining. Tooling fixtures are devices used to position and clamp workpieces during CNC milling machining, ensuring that the workpieces maintain the correct position and posture during machining, thereby guaranteeing machining accuracy and efficiency.

[0003] To address this, patent CN220533594U discloses a positioning fixture for a CNC milling machine, including a drive component. Several support components are movably mounted on the drive component, which drives the support components to move. Several clamping blocks of different shapes are rotatably mounted on the support components. This invention, through the cooperation of the drive component, support components, first clamping block, second clamping block, third clamping block, and fourth clamping block, provides multiple clamping blocks from the outset for positioning. During use, operators can easily and quickly change the clamping blocks to clamp items, greatly reducing their workload, accelerating the production process, and effectively adapting to and clamping items of different shapes.

[0004] The CNC milling machine mentioned above uses positioning fixtures to make it convenient and quick to change clamping blocks to clamp the workpiece. However, when clamping the workpiece, it only has unidirectional lateral clamping, which cannot provide sufficient clamping force to resist the cutting force and vibration during the machining process. This causes the workpiece to shift during the machining process, affecting the machining accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a positioning fixture for CNC milling machines to solve the problem of poor clamping effect of existing positioning fixtures for CNC milling machines.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a positioning fixture for a CNC milling machine, comprising a housing and a limiting mechanism; the limiting mechanism is movably installed inside the housing, and limiting plates are movably installed on both sides of the limiting mechanism; a reinforcing structure is provided on the top of the limiting plate; the reinforcing structure includes a reinforcing plate, a second spring, a movable plate, a locking pin, and a top plate; the reinforcing plate is hinged to the top of the limiting plate, locking pins are fixedly installed on the top of the limiting plate inside the reinforcing plate, a top plate is hinged to one side of the bottom of the reinforcing plate, a second spring is fixedly installed at both ends of the bottom of the reinforcing plate, and a movable plate is provided through the limiting plate at the bottom of the top plate.

[0007] Preferably, the reinforcing plate includes a locking block, a first spring, and a locking strip, with the locking strip fixedly installed on the top of the reinforcing plate.

[0008] Preferably, each of the card strips has a card block movably installed inside, and a first spring is fixedly installed on one side of each card block. One side of each card block is trapezoidal, and a sliding structure is formed between the card block and the card strip.

[0009] Preferably, the movable plate and the limiting plate form a sliding structure, and a protrusion is provided on one side of the movable plate, and a third spring is fixedly installed on the bottom of the movable plate.

[0010] Preferably, each of the locking posts has a locking groove inside, and the locking groove and the locking block form an engaging structure, with the locking post penetrating the interior of the reinforcing plate.

[0011] Preferably, the limiting mechanism includes a slide, a lead screw, a limiting shaft, and a servo motor. The lead screw is movably installed inside the housing, and a servo motor is installed on one side of the lead screw.

[0012] Preferably, slides are movably mounted on both sides of the lead screw, and limit shafts are fixedly installed inside the housings at both ends of the slides, with the slides and the lead screw being threaded together.

[0013] This utility model provides a positioning fixture for CNC milling machines, the advantages of which are: by setting a reinforcing structure, a movable plate is set inside the limiting plate. When the limiting plate clamps the workpiece, the movable plate first contacts the workpiece and continuously slides into the limiting plate, causing the top plate to lose support. The reinforcing plate flips downward under the contraction force of the second spring, pressing down on both sides of the workpiece to achieve a vertical limiting effect. At the same time, when the locking block flips into the locking slot of the locking post, it slides into the locking slot under the tension of the first spring, which reinforces the reinforcing plate and enhances the stability of the limiting. Thus, the positioning fixture for CNC milling machines can simultaneously achieve limiting in both the lateral and vertical directions, improve the clamping force, prevent the workpiece from shifting during processing, and ensure processing accuracy. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the shell of this utility model in a semi-sectional state;

[0016] Figure 3 This is a top-view three-dimensional structural diagram of the limiting plate of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the limiting plate of this utility model from a bottom view;

[0018] Figure 5This is a top-view three-dimensional structural diagram of the limiting plate of this utility model in a semi-sectional state.

[0019] Figure 6 This is a three-dimensional structural diagram of the limiting plate of this utility model, viewed from below in a semi-sectional state.

[0020] In the diagram: 1. Outer shell; 2. Reinforcement structure; 21. Reinforcement plate; 211. Locking block; 212. First spring; 213. Locking strip; 22. Second spring; 23. Movable plate; 231. Protrusion; 232. Third spring; 24. Locking post; 25. Top plate; 3. Limiting plate; 4. Limiting mechanism; 41. Slide table; 42. Lead screw; 43. Limiting shaft; 44. Servo motor. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-6 The present invention provides a positioning fixture for a CNC milling machine, comprising a housing 1 and a limiting mechanism 4; the limiting mechanism 4 is movably installed inside the housing 1, and limiting plates 3 are movably installed on both sides of the limiting mechanism 4. A reinforcing structure 2 is provided on the top of the limiting plate 3. The limiting mechanism 4 includes a slide 41, a lead screw 42, a limiting shaft 43 and a servo motor 44. The lead screw 42 is movably installed inside the housing 1, and a servo motor 44 is installed on one side of the lead screw 42. The slide 41 is movably installed on both sides of the lead screw 42, and the limiting shaft 43 is fixedly installed inside the housing 1 at both ends of the slide 41. The slide 41 and the lead screw 42 are threadedly connected.

[0023] See attached document Figure 1 and Figure 2 When using this device, the workpiece is first placed in the middle position of the outer casing 1, and then the servo motor 44 is started to drive the lead screw 42 to rotate. Because the threads on both sides of the lead screw 42 are opposite, the slide table 41 that is threadedly engaged with it moves to the middle position. The limiting shafts 43 set at both ends of the slide table 41 can limit the slide table 41 to prevent it from rotating when the lead screw 42 rotates. The slide table 41 drives the limiting plate 3 to clamp the workpiece.

[0024] The reinforcing structure 2 includes a reinforcing plate 21, a second spring 22, a movable plate 23, a locking post 24, and a top plate 25. The reinforcing plate 21 is hinged to the top of the limiting plate 3. The top of the limiting plate 3 inside the reinforcing plate 21 is fixedly installed with a locking post 24. The top plate 25 is hinged to one side of the bottom of the reinforcing plate 21. The two ends of the bottom of the reinforcing plate 21 are fixedly installed with second springs 22. The movable plate 23 is provided through the limiting plate 3 at the bottom of the top plate 25. The reinforcing plate 21 includes a locking block 211, a first spring 212, and a locking strip 213. The locking strip 213 is fixedly installed on the reinforcing plate 21. At the top of 1, each of the inside of the locking strip 213 has a locking block 211 movably installed, and each of the locking blocks 211 has a first spring 212 fixedly installed on one side. One side of the locking block 211 is trapezoidal, and the locking block 211 and the locking strip 213 form a sliding structure. The movable plate 23 and the limiting plate 3 form a sliding structure, and each of the movable plates 23 has a protrusion 231 on one side. Each of the bottoms of the movable plates 23 has a third spring 232 fixedly installed. Each of the locking posts 24 has a locking groove inside, and the locking groove and the locking block 211 form a locking structure. The locking post 24 penetrates the interior of the reinforcing plate 21.

[0025] See attached document Figure 3 and Figure 6 When the device is in use, when the limiting plate 3 is displaced to clamp the workpiece, the movable plate 23 first contacts the workpiece and continuously slides into the interior of the limiting plate 3, causing the protrusion 231 to move to one side, causing the top plate 25 to lose support. The reinforcing plate 21 flips downward under the contraction force of the second spring 22, pressing the two sides of the workpiece to achieve a vertical limiting effect. At the same time, when the locking block 211 flips to the slot of the locking post 24, it slides into the slot under the tension of the first spring 212, which reinforces the reinforcing plate 21 and enhances the stability of the limiting. When it is necessary to release the workpiece, the locking block 211 is slid to the outside of the slot to one side, and the reinforcing plate 21 is flipped upward. Under the contraction force of the third spring 232, the movable plate 23 pushes the movable plate 23 and the protrusion 231 to reset, and the top plate 25 is supported. At the same time, the servo motor 44 is started to drive the lead screw 42 to rotate in the opposite direction, causing the slide table 41 and the limiting plate 3 above it to move to both sides.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning fixture for a CNC milling machine, comprising a housing (1) and a limiting mechanism (4); Its features are: The housing (1) is movably installed with a limiting mechanism (4), and limiting plates (3) are movably installed on both sides of the limiting mechanism (4). The top of the limiting plate (3) is provided with a reinforcing structure (2). The reinforcement structure (2) includes a reinforcement plate (21), a second spring (22), a movable plate (23), a retaining post (24), and a top plate (25); The reinforcing plate (21) is hinged to the top of the limiting plate (3). The top of the limiting plate (3) inside the reinforcing plate (21) is fixedly installed with a locking post (24). The bottom side of the reinforcing plate (21) is hinged with a top plate (25). The bottom ends of the reinforcing plate (21) are fixedly installed with a second spring (22). The limiting plate (3) at the bottom of the top plate (25) is provided with a movable plate (23) through it.

2. The positioning fixture for a CNC milling machine according to claim 1, characterized in that: The reinforcing plate (21) includes a locking block (211), a first spring (212), and a locking strip (213), the locking strip (213) being fixedly installed on the top of the reinforcing plate (21).

3. A positioning fixture for a CNC milling machine according to claim 2, characterized in that: Each of the card strips (213) has a card block (211) movably installed inside, and a first spring (212) is fixedly installed on one side of each card block (211). One side of the card block (211) is trapezoidal, and a sliding structure is formed between the card block (211) and the card strip (213).

4. A positioning fixture for a CNC milling machine according to claim 1, characterized in that: The movable plate (23) and the limiting plate (3) form a sliding structure, and a protrusion (231) is provided on one side of the movable plate (23), and a third spring (232) is fixedly installed on the bottom of the movable plate (23).

5. A positioning fixture for a CNC milling machine according to claim 3, characterized in that: Each of the card posts (24) has a card slot inside, and the card slot and the card block (211) form a locking structure. The card posts (24) penetrate the interior of the reinforcing plate (21).

6. A positioning fixture for a CNC milling machine according to claim 1, characterized in that: The limiting mechanism (4) includes a slide (41), a lead screw (42), a limiting shaft (43), and a servo motor (44). The lead screw (42) is movably installed inside the housing (1), and the servo motor (44) is installed on one side of the lead screw (42).

7. A positioning fixture for a CNC milling machine according to claim 6, characterized in that: Both sides of the lead screw (42) are movably mounted with slides (41), and the housings (1) at both ends of the slides (41) are fixedly mounted with limit shafts (43). The slides (41) and the lead screw (42) are threaded together.

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