High-precision positioning fixture for cold upsetting machining

Abstract

This utility model relates to the field of fixture technology and discloses a high-precision positioning fixture for cold heading, including a U-shaped fixed frame. Cylinders are fixedly connected to the upper and lower ends of the fixed frame, and a connecting frame is fixedly connected to the end of each cylinder. An arc-shaped plate is fixedly connected to the inner wall of the connecting frame. A clamping assembly is mounted on the surface of the arc-shaped plate. The clamping assembly consists of several clamping plates and a driving component. The clamping plates penetrate the arc-shaped plate, and one end of each clamping plate has a triangular sharp end. In this utility model, the cylinders drive the clamping plates to move and clamp the fasteners. When cleaning the clamping plates is required, the driving component moves the clamping plates outward, allowing a scraper to clean the surface of the clamping plates, removing grease and dust adhering to the sharp end, thereby reducing grease and dust residue on the sharp end and increasing the durability of the clamping assembly.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and in particular to a high-precision positioning fixture for cold heading. Background Technology

[0002] Cold heading is a new type of metal pressure processing technology with minimal cutting. It is a processing method that utilizes the plastic deformation of metal under external force and uses a mold to redistribute and transfer the metal volume to form the required parts or blanks. Cold heading machines are specialized equipment mainly used for mass production of fasteners such as nuts and bolts. During the operation of a cold heading forming machine, a flipping and clamping mechanism is used to flip the materials during the processing to process different surfaces.

[0003] Currently, most cold heading forming machines use a flipping clamping mechanism. During the clamping and releasing process, residues such as grease and dust can easily accumulate at the clamping points. These residues can affect the clamping force and duration. However, most current mechanisms are not convenient for frequent cleaning of the clamping points, which reduces the effectiveness of the mechanism and greatly reduces the practicality of the device. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a high-precision positioning fixture for cold heading, which aims to improve the problem of residue easily generated in the clamping part of the fixture.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-precision positioning fixture for cold heading includes a U-shaped fixed frame. Cylinders are fixedly connected to the upper and lower ends of the fixed frame, and a connecting frame is fixedly connected to the end of each cylinder. An arc-shaped plate is fixedly connected to the inner wall of the connecting frame. A clamping assembly is mounted on the surface of the arc-shaped plate. The clamping assembly consists of several clamping plates and a driving component. The clamping plates penetrate the arc-shaped plate. One end of each clamping plate has a sharp triangular end, and the other end of the clamping plate has a threaded hole. A lead screw is threaded into the threaded hole. One end of the lead screw is rotatably connected to the arc-shaped plate. Scrapers are respectively provided on both sides of the sharp end. One end of each scraper is rotatably connected to the inner wall of the arc-shaped plate via a torsion spring shaft. The driving component is mounted on the outer side of the arc-shaped plate and is used to drive multiple sets of lead screws to rotate synchronously.

[0007] Preferably, the driving component includes a fan-shaped bracket, both ends of which are fixedly connected to the outer wall of the arc-shaped plate, and a motor is fixedly connected to the outer wall of the bracket. The driving end of the motor is fixedly connected to one end of one of the lead screws.

[0008] Preferably, the driving component includes a plurality of toothed rings, which are fixedly mounted on the outer wall of the lead screw. The tooth ends of the plurality of toothed rings are engaged with an arc-shaped rack, and one end of the arc-shaped rack is slidably connected to the outer wall of the arc-shaped plate in an arc shape.

[0009] Preferably, a rotating shaft is fixedly connected to the center of the side wall of the fixed frame, a U-shaped fixing member is rotatably connected to the outer wall of the rotating shaft, and fixing seats are fixedly connected to both ends of the fixing member. The fixing seats are fixedly mounted on the main body of the cold heading machine.

[0010] Preferably, a rotating assembly is installed at both the fixing member and the rotating shaft. The rotating assembly includes an electric push cylinder, which is fixedly installed on the top of the fixing member. A U-shaped drive plate is fixedly connected to the drive end of the electric push cylinder.

[0011] Preferably, the inner sidewall of the drive plate is provided with a toothed groove group, which is meshed with a gear, and one end of the rotating shaft is fixedly connected to the center of the outer wall of the gear.

[0012] Preferably, the top corner of the drive plate is provided with an inclined surface, the upper side wall of the fixing frame is provided with a locking hole, and a counterweight is fixedly provided at the bottom of the fixing frame.

[0013] Preferably, the rotating assembly includes a U-shaped mounting channel, which is opened on the upper side wall of the fixing member. A locking rod is slidably connected inside the mounting channel, and an elastic element is sleeved on the surface of the locking rod.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the clamping plate is moved by the cylinder to clamp and fix the fastener. When the clamping plate needs to be cleaned, the clamping plate is moved outward by the driving component so that the scraper can clean the surface of the clamping plate, scrape off the grease and dust attached to the sharp end, thereby reducing the residue of grease and dust on the sharp end and increasing the durability of the clamping component.

[0016] 2. In this utility model, when the electric push cylinder is running, the fasteners held by the rotating clamping assembly are stabilized by the cooperation of the tooth groove group and the gear. After the device is used, the locking rod is inserted into the locking hole to lock the fixing frame, thereby reducing the wear of the tooth surface and extending the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a perspective view of a high-precision positioning fixture for cold heading proposed in this utility model.

[0018] Figure 2This is a schematic diagram of the fixing frame structure of a high-precision positioning fixture for cold heading proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the clamping component structure of a high-precision positioning fixture for cold heading proposed in this utility model;

[0020] Figure 4 This utility model proposes a high-precision positioning fixture for cold heading. Figure 3 Enlarged view of point A;

[0021] Figure 5 This is a schematic diagram of the rotating component structure of a high-precision positioning fixture for cold heading proposed in this utility model.

[0022] Figure 6 This utility model proposes a high-precision positioning fixture for cold heading. Figure 5 Enlarged view of point B;

[0023] Figure 7 This is a schematic diagram of the tooth groove group and gear structure of a high-precision positioning fixture for cold heading proposed in this utility model.

[0024] Legend:

[0025] 1. Fixed frame; 2. Cylinder; 3. Connecting frame; 4. Arc plate; 5. Clamping assembly; 51. Clamping plate; 52. Lead screw; 53. Scraper; 54. Drive component; 541. Bracket; 542. Motor; 543. Gear ring; 544. Arc rack; 6. Rotating shaft; 7. Fixed component; 8. Fixed seat; 9. Rotating assembly; 91. Electric push cylinder; 92. Drive plate; 93. Gear set; 94. Gear; 95. Installation channel; 96. Locking rod; 97. Elastic component; 10. Locking hole; 11. Counterweight. Detailed Implementation

[0026] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Reference Figure 1 and Figure 3This utility model provides an embodiment of a high-precision positioning fixture for cold heading, comprising a U-shaped fixed frame 1, with cylinders 2 fixedly connected to the upper and lower ends of the fixed frame 1, and a connecting frame 3 fixedly connected to the end of the cylinders 2. An arc-shaped plate 4 is fixedly connected to the inner wall of the connecting frame 3, and a clamping assembly 5 is mounted on the surface of the arc-shaped plate 4. The clamping assembly 5 consists of several clamping plates 51 and a driving component 54. The clamping plates 51 penetrate the arc-shaped plate 4, with a triangular sharp end at one end and a threaded hole on the surface of the other end of the clamping plate 51. The threaded hole is internally threaded. There is a lead screw 52, ​​one end of which is rotatably connected to the arc plate 4. Scrapers 53 are respectively provided on both sides of the sharp end. One end of the scraper 53 is rotatably connected to the inner wall of the arc plate 4 through a torsion spring shaft. The drive component 54 is installed on the outer side of the arc plate 4. The drive component 54 is used to drive multiple sets of lead screws 52 to rotate synchronously. The flow rate and pressure of compressed air entering the two cylinders 2 are precisely controlled by a proportional valve. The position or speed of the cylinders 2 are detected in real time by a sensor and the signal is fed back to the control system. The control system adjusts the proportional valve according to the feedback signal to realize the synchronous extension and retraction of the two cylinders 2.

[0028] Specifically, the cylinder 2 extends and retracts to adjust the distance between the two arc-shaped plates 4, facilitating the placement or removal of fasteners. The sharp end of the clamping plate 51 is used to clamp and fix the fasteners. The scraper 53 abuts against the clamping plate 51 through the torque of the torsion spring shaft. When clamping the fasteners during cold forging, the fasteners are placed between the two arc-shaped plates 4. The extension of the cylinder 2 causes the two arc-shaped plates 4 to move relative to each other, allowing the clamping plate 51 to clamp and fix the fasteners. When the surface of the clamping plate 51 needs to be cleaned, it is driven... The component 54 synchronously drives multiple sets of lead screws 52 to rotate. The rotation of the lead screws 52 causes the clamping plate 51 to slide. When the sharp end of the clamping plate 51 moves to the scraper 53, the scraper 53 scrapes away the grease and dust attached to the surface of the sharp end, thereby reducing the residue of grease and dust on the sharp end and increasing the durability of the clamping component 5. After cleaning, the lead screw 52 rotates in the opposite direction, causing the clamping plate 51 to move towards the midpoint of the arc plate 4, so that the scraper 53 is misaligned with the sharp end. This device is suitable for clamping and fixing cylindrical fasteners.

[0029] Reference Figure 4 The driving component 54 includes a fan-shaped bracket 541. Both ends of the bracket 541 are fixedly connected to the outer wall of the arc plate 4. A motor 542 is fixedly connected to the outer wall of the bracket 541. The driving end of the motor 542 is fixedly connected to one end of one of the lead screws 52. The driving component 54 includes several toothed rings 543. The toothed rings 543 are fixedly installed on the outer wall of the lead screw 52. The tooth ends of the several toothed rings 543 are meshed with an arc-shaped rack 544. One end of the arc-shaped rack 544 is slidably connected to the outer wall of the arc plate 4 in an arc shape. The other end of the lead screw 52 connected to the motor 542 is rotatably connected to the bracket 541.

[0030] Specifically, the motor 542 drives the connected lead screw 52 to rotate, which in turn drives the connected gear ring 543 to rotate. The rotation of the gear ring 543 drives the arc-shaped rack 544 to slide along the outer wall of the arc-shaped plate 4. When the arc-shaped rack 544 moves, it drives the other gear rings 543 to rotate, and the other gear rings 543 drive the other lead screws 52 to rotate. Thus, the motor 542 synchronously drives multiple sets of lead screws 52 to rotate, achieving the effect of synchronously adjusting the position of the clamping plate 51.

[0031] Reference Figure 5 A rotating shaft 6 is fixedly connected to the center of the side wall of the fixed frame 1. A U-shaped fixing part 7 is rotatably connected to the outer wall of the rotating shaft 6. Fixing seats 8 are fixedly connected to both ends of the fixing part 7. The fixing seats 8 are fixedly installed on the main body of the cold heading forming machine.

[0032] Specifically, the clamping component 5 can be flipped by rotating the rotating shaft 6 to achieve the effect of flipping and clamping.

[0033] Reference Figure 5 and Figure 7 A rotating assembly 9 is installed at both the fixing part 7 and the rotating shaft 6. The rotating assembly 9 includes an electric push cylinder 91, which is fixedly installed on the top of the fixing part 7. A U-shaped drive plate 92 is fixedly connected to the drive end of the electric push cylinder 91. One end of the drive plate 92 is slidably connected to the inner wall of the fixing part 7. A toothed groove group 93 is provided on the inner wall of the drive plate 92. A gear 94 is meshed with the toothed groove group 93. One end of the rotating shaft 6 is fixedly connected to the center of the outer wall of the gear 94. The drive plate 92 is slidably connected to the inner wall of the fixing part 7. A high-precision magnetoelectric rotary encoder is fixedly installed at one end of the gear 94 to achieve accurate measurement of its rotation angle, thereby accurately controlling the flip angle of the fastener. The magnetoelectric rotary encoder is electrically connected to a controller. The controller is electrically connected to the cylinder 2, the motor 542, and the electric push cylinder 91 to achieve the control effect.

[0034] Specifically, when the fastener is cold-forged and flipped, the electric push cylinder 91 pushes the drive plate 92 to move in the vertical direction. When the drive plate 92 moves, it drives the gear 94 to rotate through the toothed groove group 93. The rotation of the gear 94 drives the rotating shaft 6 to rotate, and the rotation of the rotating shaft 6 drives the fixed frame 1 to rotate, thereby achieving the effect of stabilizing the fastener held by the flipping clamping assembly 5.

[0035] Reference Figure 5 and Figure 6 The top corner of the drive plate 92 is provided with a bevel, the upper side wall of the fixing frame 1 is provided with a locking hole 10, the bottom of the fixing frame 1 is fixedly provided with a counterweight block 11, the rotating component 9 includes a Chinese character-shaped installation channel 95, the installation channel 95 is provided on the upper side wall of the fixing member 7, the interior of the installation channel 95 is slidably connected with a locking rod 96, and the surface of the locking rod 96 is fitted with an elastic member 97.

[0036] Specifically, after use, by controlling the retraction of the electric push cylinder 91, the toothed set 93 and the gear 94 are misaligned. The fixed frame 1 is kept vertically distributed by the gravity of the counterweight block 11. When the electric push cylinder 91 retracts to its minimum extent, the inclined surface of the drive plate 92 pushes the locking rod 96 to move in the opposite direction to the locking hole 10, so that the locking rod 96 slides into the interior of the locking hole 10, thereby achieving the effect of locking the fixed frame 1, reducing the wear of the tooth surface, and extending the service life of the equipment. When the equipment needs to be used, the electric push cylinder 91 extends to misalign the drive plate 92 and the locking rod 96. The locking rod 96 is released from the locking hole 10 by the elastic force of the elastic element 97, achieving the effect of automatic unlocking.

[0037] Working principle: When fasteners need to be cold-forged, they are flipped and clamped. First, the fasteners are placed between two arc-shaped plates 4. The cylinder 2 extends to make the two arc-shaped plates 4 move relative to each other, so that the clamping plate 51 can clamp and fix the fasteners. Then, the electric push cylinder 91 pushes the drive plate 92 to move in the vertical direction. When the drive plate 92 moves, it drives the gear 94 to rotate through the toothed group 93. The rotation of the gear 94 drives the rotating shaft 6 to rotate. The rotation of the rotating shaft 6 drives the fixed frame 1 to rotate. The rotation of the fixed frame 1 achieves the effect of stabilizing the fasteners clamped by the flipping clamping component 5.

[0038] After use, by controlling the retraction of the electric push cylinder 91, the toothed assembly 93 and the gear 94 are misaligned. The fixed frame 1 is kept vertically distributed by the gravity of the counterweight block 11. When the electric push cylinder 91 retracts to its minimum extent, the inclined surface of the drive plate 92 pushes the locking rod 96 to move in the opposite direction to the locking hole 10, so that the locking rod 96 slides into the interior of the locking hole 10, thereby achieving the effect of locking the fixed frame 1, reducing the wear of the tooth surface, and extending the service life of the equipment. When the equipment needs to be used, the electric push cylinder 91 extends to misalign the drive plate 92 and the locking rod 96. The locking rod 96 is released from the locking hole 10 by the elastic force of the elastic element 97, achieving the effect of automatic unlocking.

[0039] When the surface of the clamping plate 51 needs to be cleaned, the drive component 54 synchronously drives multiple sets of lead screws 52 to rotate. The rotation of the lead screws 52 causes the clamping plate 51 to slide. When the sharp end of the clamping plate 51 moves to the scraper 53, the scraper 53 scrapes away the grease and dust attached to the surface of the sharp end, thereby reducing the residue of grease and dust on the sharp end and increasing the durability of the clamping assembly 5. After cleaning, the lead screw 52 rotates in the opposite direction, causing the clamping plate 51 to move towards the midpoint of the arc plate 4, so that the scraper 53 is misaligned with the sharp end. When the drive component 54 drives the lead screw 52 to rotate, the motor 542 drives the connected lead screw 52 to rotate. The rotation of the lead screw 52 drives the connected gear ring 543 to rotate. The rotation of the gear ring 543 drives the arc-shaped rack 544 to slide along the outer wall of the arc plate 4. When the arc-shaped rack 544 moves, it drives the other gear rings 543 to rotate. The other gear rings 543 drive the other lead screws 52 to rotate. Thus, the motor 542 drives multiple sets of lead screws 52 to rotate synchronously, achieving the effect of synchronously adjusting the position of the clamping plate 51.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A high-precision positioning fixture for cold upsetting, comprising a U-shaped fixing frame (1), characterized in that: The upper and lower ends of the fixed frame (1) are respectively fixedly connected to cylinders (2), and the ends of the cylinders (2) are fixedly connected to connecting frames (3). The inner wall of the connecting frame (3) is fixedly connected to an arc plate (4). A clamping assembly (5) is installed on the surface of the arc plate (4). The clamping assembly (5) consists of several clamping plates (51) and a driving component (54). The clamping plates (51) slide through the arc plate (4). One end of the clamping plate (51) is provided with a sharp triangular end, and clamps... The other end of the holding plate (51) has a threaded hole, and a lead screw (52) is threaded inside the threaded hole. One end of the lead screw (52) is rotatably connected to the arc plate (4). Scrapers (53) are respectively provided on both sides of the sharp end. One end of the scraper (53) is rotatably connected to the inner wall of the arc plate (4) through a torsion spring shaft. The driving component (54) is installed on the outer side of the arc plate (4). The driving component (54) is used to drive multiple sets of lead screws (52) to rotate synchronously.

2. A high-precision positioning fixture clamp for cold heading processing according to claim 1, characterized in that: The drive unit (54) includes a fan-shaped bracket (541), the two ends of which are fixedly connected to the outer side wall of the arc plate (4). A motor (542) is fixedly connected to the outer side wall of the bracket (541), and the drive end of the motor (542) is fixedly connected to one end of one of the lead screws (52).

3. The high-precision positioning fixture clamp for cold heading processing according to claim 1, characterized in that: The drive component (54) includes several toothed rings (543), which are fixedly installed on the outer wall of the lead screw (52). The tooth ends of several toothed rings (543) are connected to an arc-shaped rack (544), and one end of the arc-shaped rack (544) is connected to the outer wall of the arc plate (4) in an arc shape.

4. The high-precision positioning fixture clamp for cold heading processing according to claim 1, characterized in that: A rotating shaft (6) is fixedly connected to the center of the side wall of the fixed frame (1). A U-shaped fixing member (7) is rotatably connected to the outer wall of the rotating shaft (6). Fixing seats (8) are fixedly connected to both ends of the fixing member (7). The fixing seats (8) are fixedly mounted on the main body of the cold heading machine.

5. A high-precision positioning fixture clamp for cold heading processing according to claim 4, characterized in that: A rotating assembly (9) is installed together at the fixing member (7) and the rotating shaft (6). The rotating assembly (9) includes an electric push cylinder (91), which is fixedly installed on the top of the fixing member (7). A U-shaped drive plate (92) is fixedly connected to the drive end of the electric push cylinder (91).

6. A high-precision positioning fixture clamp for cold heading processing according to claim 5, characterized in that: The inner sidewall of the drive plate (92) is provided with a toothed groove group (93), which is meshed with a gear (94). One end of the rotating shaft (6) is fixedly connected to the center of the outer wall of the gear (94).

7. A high-precision positioning fixture clamp for cold heading processing according to claim 5, characterized in that: The top corner of the drive plate (92) is provided with a bevel, the upper side wall of the fixing frame (1) is provided with a locking hole (10), and a counterweight (11) is fixedly provided at the bottom of the fixing frame (1).

8. A high-precision positioning fixture for cold heading according to claim 5, characterized in that: The rotating assembly (9) includes a U-shaped mounting channel (95), which is opened on the upper side wall of the fixing member (7). A locking rod (96) is slidably connected inside the mounting channel (95), and an elastic member (97) is sleeved on the surface of the locking rod (96).

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