Punch press linkage bottom dead center stop limit structure

Abstract

This utility model discloses a bottom dead center stop and limit structure for a punch press linkage, including a punch press frame, a punch, and a lower die base. A sliding channel is provided inside the lower die base, and a pull rod is movably inserted into the sliding channel. A guide fixing plate is provided above the pull rod extending from the sliding channel. A guide post is provided on the guide fixing plate, and a second guide fixing plate is provided between the guide posts. A cutting fixing plate is also provided between the guide posts, and a cutting die is provided on the cutting fixing plate. A cutting pressure blade is provided below the second guide fixing plate. An eccentric connecting rod is sleeved below the pull rod. A connecting rod bracket is provided on the side of the lower die base, and a blanking stretching limit assembly is hinged to the connecting rod bracket. The blanking stretching limit assembly includes a transmission chain, a cam, a follower wheel, and a force-saving connecting rod. The force-saving connecting rod is hinged to the connecting rod bracket, with one end of the force-saving connecting rod hinged to the follower wheel. The other end of the force-saving connecting rod is connected to the eccentric connecting rod, and the other end of the transmission chain is connected to the cam. The cam and the follower wheel cooperate. This utility model extends the service life of the die.

Description

Technical Field

[0001] This utility model relates to the technical field of punch presses, specifically to a bottom dead center stop and limit structure for a punch press linkage. Background Technology

[0002] A punch press is essentially a stamping press. Compared to traditional machining, stamping offers advantages such as material and energy savings, high efficiency, lower operator skill requirements, and the ability to produce products impossible to manufacture by machine using various molds. Therefore, its applications are becoming increasingly widespread. Stamping production primarily deals with sheet metal. Using molds, it can produce blanking, punching, forming, deep drawing, trimming, fine blanking, shaping, riveting, and extruded parts, among others, finding wide application in various fields.

[0003] The design principle of a punch press is to convert circular motion into linear motion. The main motor drives the flywheel, which in turn drives the gears, crankshaft (or eccentric gear), and connecting rods via the clutch to achieve the linear motion of the slide. The motion from the main motor to the connecting rod is circular motion. Currently, punch presses generally use spring-loaded blanking during the stamping process. However, spring-loaded blanking has poor stability, and the spring will impact the die to a certain extent after the blank is stretched, which greatly affects the die's service life. Moreover, current punch presses do not have a bottom dead center stop angle when pressing down, which makes it impossible to perform other operations such as blanking and stretching of products. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this utility model is to provide a bottom dead center stop and limit structure for a connecting rod in a punch press to solve the problem mentioned in the background art. Currently, existing punch presses generally use spring pressing during the stamping process. However, spring pressing has poor stability, and the spring will impact the die to a certain extent after the material is stretched, which greatly affects the service life of the die. Moreover, current punch presses do not have a bottom dead center stop angle when pressing down, which makes it impossible to perform other tasks such as blanking and stretching of products.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lower dead center stop and limit structure for a punch press linkage, comprising a punch press frame, a punch capable of downward pressing and a lower die base located below the punch, a sliding channel provided in the lower die base, a pull rod movably inserted into the sliding channel, a guide fixing plate 1 provided on the portion of the pull rod extending above the sliding channel, one or more guide posts provided on the guide fixing plate 1, a guide fixing plate 2 connected above all the guide posts, a cutting fixing plate provided between all the guide posts, and the cutting fixing plate also provided on the punch press frame, a cutting die provided on the cutting fixing plate, a cutting pressure blade provided below the guide fixing plate 2, and the punch passing through the guide fixing plate. Plate 2, after the cutting and pressing blade can be inserted into the cutting die, the lower part of the pull rod extends out of the sliding channel and is externally sleeved with an eccentric connecting rod, the side of the lower die base is provided with a connecting rod bracket, the connecting rod bracket is hinged with a blanking stretching limiting component that can adjust the eccentric connecting rod for displacement compensation and correction, and can limit the pull rod. The blanking stretching limiting component includes a transmission chain connected to the punch press spindle at one end, a drive cam, a follower wheel and a force-saving connecting rod, the force-saving connecting rod is hinged to the connecting rod bracket through hinge point one, one end of the force-saving connecting rod is hinged to the follower wheel through hinge point two, the other end of the force-saving connecting rod is connected to the eccentric connecting rod, the other end of the transmission chain is connected to the drive cam, and the drive cam cooperates with the follower wheel.

[0006] Preferably, in order to achieve more effortless operation, the hinge point one on the effort-saving link and one end of the effort-saving link occupy one-third of the entire effort-saving link, the hinge point one on the effort-saving link and one end of the effort-saving link occupy two-thirds of the entire effort-saving link, and the follower wheel is located at the end point of the two-thirds distance between the hinge point one and the effort-saving link.

[0007] Preferably, for ease of installation, one end of the effort-saving connecting rod is provided with a notch, and a positioning bracket is inserted into the notch. The positioning bracket is threadedly connected to the notch by one or more mounting screws, and the follower wheel is hinged below the positioning bracket.

[0008] Preferably, in order to adjust the length of the pull rod, the pull rod includes an upper rod body and a lower rod body. The lower part of the upper rod body is provided with an external threaded portion one, and the upper part of the lower rod body is provided with an external threaded portion two. A pull rod connecting block is provided between the upper rod body and the lower rod body. An internal threaded sleeve is provided in the pull rod connecting block, which is threadedly connected to the external threaded portion one and the external threaded portion two. The eccentric connecting rod is provided outside the lower rod body.

[0009] Preferably, in order to ensure that the pull rod has a certain force-bearing point when it is pressed down and to ensure greater force stability, a slider is also sleeved on the outer side below the lower rod body. A guide rail is provided on the punch press frame. The slider is slidably connected to the guide rail. The slider is hinged and positioned on the pull rod by a positioning shaft that passes through the slider and the pull rod laterally.

[0010] Preferably, the eccentric connecting rod and the lower rod body are connected by a second positioning shaft. The second positioning shaft passes laterally through the eccentric connecting rod and the lower rod body to hinge and position the eccentric connecting rod on the pull rod. The second positioning shaft is also fitted with an anti-slip bushing.

[0011] Preferably, for ease of disassembly, two spaced positioning posts are provided below the lower mold base. A pull rod guide plate is fixed between the two positioning posts by locking screws. The pull rod passes through the pull rod guide plate and connects to the eccentric connecting rod.

[0012] Preferably, for ease of installation, a limiting boss is provided on the top of the pull rod, and the limiting boss is threadedly connected to the guide fixing plate by one or more positioning screws.

[0013] Preferably, to ensure the stability of the replacement, there are four guide posts, and the four guide posts are located on the four sides of the outside of the pull rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This structure uses an eccentric connecting rod to correct the angle, ultimately ensuring that the downward force of the pull rod 4 is always at the same downward angle, preventing the force from being dispersed. Finally, the active cam provides a bottom dead center stop angle to complete the blanking, stretching, and unloading work. Moreover, it eliminates the problem of poor stability caused by spring pressing, further avoids the impact of traditional cutting edges and the problem of secondary die impact after blanking and stretching, extends the service life of the die, and improves the quality of the stamping process. Attached Figure Description

[0015] Figure 1 This is a side view of the bottom dead center stop and limit structure of the connecting rod for punch press linkage in Embodiment 1.

[0016] Figure 2 This is an exploded view of the tie rod in Embodiment 1.

[0017] Figure 3 for Figure 1 Enlarged view of point A;

[0018] Figure 4 for Figure 1 Enlarged view of point B.

[0019] In the diagram: 1. Punch press frame; 2. Punch head; 3. Lower die holder; 301. Sliding channel; 4. Tie rod; 401. Upper rod body; 402. Lower rod body; 403. External thread part one; 404. External thread part two; 5. Guide fixing plate one; 6. Guide post; 7. Guide fixing plate two; 8. Cutting fixing plate; 9. Cutting die; 10. Eccentric connecting rod; 11. Connecting rod bracket; 12. Transmission chain; 13. Active cam; 14. Follower wheel; 15. Effort-saving connecting rod; 16. Hinge point one; 161. Hinge point two; 162. Notch; 163. Positioning bracket; 17. Mounting screw; 18. Tie rod connecting block; 181. Internal threaded sleeve; 19. Slider; 20. Guide rail; 21. Positioning shaft one; 22. Tie rod guide plate; 23. Locking screw; 24. Positioning shaft two; 25. Anti-slip bushing; 251. Positioning post; 26. Limiting boss; 27. Positioning screw; 28. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] Example 1

[0023] Please see Figures 1-4As shown in this embodiment, a lower dead center stop and limit structure for a punch press linkage includes a punch press frame 1. The punch press frame 1 is equipped with a punch 2 capable of downward pressing and a lower die holder 3 located below the punch 2. A sliding channel 301 is provided within the lower die holder 3. A pull rod 4 is movably inserted into the sliding channel 301. A guide fixing plate 5 is provided on the portion of the pull rod 4 extending above the sliding channel 301. One or more guide posts 6 are provided on the guide fixing plate 5. A second guide fixing plate 7 connects all the guide posts 6. A cutting fixing plate 8 is also provided, and the cutting fixing plate 8 is also provided on the punch press frame 1. A cutting die 9 is provided on the cutting fixing plate 8. A cutting and pressing blade 10 is provided below the guide fixing plate 2 7. The punch 2 can be inserted into the cutting die 9 after passing through the guide fixing plate 2 7 and the cutting and pressing blade 10. An eccentric connecting rod 11 is sleeved on the outside of the sliding channel 301 extending below the pull rod 4. A connecting rod bracket 12 is provided on the side of the lower die base 3. A connecting rod bracket 12 is hinged on the connecting rod bracket 12 to adjust the eccentric connecting rod 11 for displacement compensation and correction. The blanking and stretching limiting assembly, which can limit the movement of the pull rod 4, includes a transmission chain 13 connected to the main shaft of the punch press, a drive cam 14, a follower wheel 15, and a force-saving connecting rod 16. The force-saving connecting rod 16 is hinged to the connecting rod bracket 12 through hinge point 161. One end of the force-saving connecting rod 16 is hinged to the follower wheel 15 through hinge point 162. The other end of the force-saving connecting rod 16 is connected to the eccentric connecting rod 11. The other end of the transmission chain 13 is connected to the drive cam 14. In conjunction with the follower wheel 15, to ensure the stability of replacement, there are four guide posts 6, which are located on the outer perimeter of the pull rod 4. For easy installation, one end of the force-saving connecting rod 16 is provided with a notch 163, and a positioning bracket 17 is inserted into the notch 163. The positioning bracket 17 is threadedly connected to the notch 163 by one or more mounting screws 18. The follower wheel 15 is hinged below the positioning bracket 17, and the positioning bracket 17 can be quickly and easily fixed in the notch 163 by the mounting screws 18.

[0024] Preferably, to achieve more effortless operation, the hinge point 161 on the effort-saving link 16 occupies one-third of the entire effort-saving link 16, and the hinge point 161 on the effort-saving link 16 occupies two-thirds of the entire effort-saving link 16. The follower wheel 15 is located at the end point of the two-thirds distance between the hinge point 161 and the effort-saving link 16. In this structure, the hinge point 161 is set at one-third of the distance after the entire link is divided into three equal parts. Ultimately, when the effort-saving link 16 swings in the form of a lever with the hinge point 161, the operation is more effortless.

[0025] Preferably, to allow adjustment of the pull rod length, the pull rod 4 includes an upper rod body 401 and a lower rod body 402. The upper rod body 401 has a first external threaded portion 403 at its lower end, and the lower rod body 402 has a second external threaded portion 404 at its upper end. A pull rod connecting block 181 is provided between the upper rod body 401 and the lower rod body 402. The pull rod connecting block 181 contains an internally threaded sleeve 19 that is threadedly connected to both the first external threaded portion 403 and the second external threaded portion 404. The eccentric connecting rod 11 is located outside the lower rod body 402. In this embodiment, for ease of adjustment... The length of the pull rod is adjusted by dividing the pull rod 4 into two parts: an upper rod body 401 and a lower rod body 402. An external threaded portion 403 is located below the upper rod body 401, and an external threaded portion 404 is located above the lower rod body 402. A pull rod connecting block 181 with an internally threaded sleeve 19 that connects the upper and lower parts is used to achieve a threaded connection between the upper rod body 401 and the lower rod body 402 and the internally threaded sleeve 19. This allows the length of the entire pull rod 4 to be adjusted according to length requirements, further enhancing the versatility of the pull rod 4 and making it convenient for users.

[0026] Preferably, to ensure a certain force-bearing point when the pull rod is pressed down and to guarantee greater force stability, a slider 20 is also sleeved on the outer side below the lower rod body 402. A guide rail 21 is provided on the punch press frame 1, and the slider 20 is slidably connected to the guide rail 21. The slider 20 is hinged and positioned on the pull rod 4 by a positioning shaft 22 that passes laterally through the slider 20 and the pull rod 4. In this embodiment, the slider 20 is square and the pull rod 4 is round. First, the slider 20 is sleeved on the pull rod 4, and then the positioning shaft 22 passes laterally through the slider 20 and the pull rod 4 to hinge and position the slider 20 on the pull rod 4. The slider 20 is slidably connected to the guide rail 21. The positioning of the slider 20 ensures that the pull rod has a certain force-bearing point when pressed down, thus guaranteeing greater force stability.

[0027] Preferably, the eccentric connecting rod 11 and the lower rod body 402 are connected by a second positioning shaft 25. The second positioning shaft 25 passes laterally through the eccentric connecting rod 11 and the lower rod body 402 to hinge and position the eccentric connecting rod 11 on the pull rod 4. The second positioning shaft 25 is fitted with an anti-slip bushing 251. In this embodiment, the second positioning shaft 25 enables the eccentric connecting rod 11 to rotate slightly. The eccentric connecting rod 11 is also connected to the force-saving connecting rod 16. When the left side of the force-saving connecting rod 16 is raised or lowered, the eccentric connecting rod 11 drives the pull rod 4 to pull down or raise synchronously under the action of the hinge point 161.

[0028] Preferably, for ease of disassembly, two spaced positioning posts 26 are provided below the lower mold base 3. A pull rod guide plate 23 is fixed between the two positioning posts 26 by locking screws 24. The pull rod 4 passes through the pull rod guide plate 23 and connects to the eccentric connecting rod 11. During assembly, the pull rod guide plate 23 is first placed below the two positioning posts 26, and then the locking screws 24 are threaded through the corresponding through holes of the pull rod guide plate 23 and connected to the corresponding positioning posts 26, thus connecting the pull rod guide plate 23. In this embodiment, the pull rod guide plate 23 is connected by... A pull rod guide plate 23 is added below the positioning post 26. The pull rod 4 is then slidably passed through the pull rod guide plate 23, which can guide and position the pull rod 4 when it moves up and down. At the same time, for easy installation, a limiting boss 27 is provided above the pull rod 4. The limiting boss 27 is threaded to the guide fixing plate 5 through one or more positioning screws 28. During assembly, the limiting boss 27 is snapped into the corresponding groove of the guide fixing plate 5, and then the positioning screws 28 are used to thread the guide fixing plate 5 to fix the pull rod 4.

[0029] In this structure, a small punch press, consisting of a guide fixing plate 1 5, a guide fixing plate 2 7, and a guide post 6, is installed on the part of the pull rod 4 extending out of the lower die base 3. This allows the cutting and pressing blade 10 to stop for a period of time under the downward pressure of the pull rod 4, thus enabling the downward pressing and stretching operation of the product. Compared to a regular crankshaft punch press, which is in a working state during punching and therefore cannot stop for a period of time, thus preventing the product from being unloaded, stretched, or otherwise operated, the guide fixing plates 1 5 and 2 7 are connected to the pull rod 4 via the guide post 6 during operation. This allows the guide fixing plates 1 5 and 2 7 to move up and down with the pull rod 4, ultimately driving the cutting and pressing blade 10 downward. Since the cutting fixing plate 8 is also mounted on the punch press frame 1, it is fixed in place. In this embodiment, the transmission power of the pull rod 4 comes from the unloading and stretching limiting component, and the specific structure of the unloading and stretching limiting component is as follows: one end of the transmission chain 13 is connected to the main machine tool on the existing punch press frame 1. The shaft is connected, and the other end of the transmission chain 13 is connected to the drive cam 14. The side of the drive cam 14 abuts against the follower wheel 15, which is hinged to a three-fold effort-saving connecting rod 16. The other end of the effort-saving connecting rod 16 is connected to the eccentric connecting rod 11. During operation, when the drive cam 14 rotates, it drives the eccentric connecting rod 11 through the three-fold effort-saving connecting rod 16. The eccentric connecting rod 11 drives the pull rod 4 to move up and down. During the rotation of the effort-saving connecting rod 16, there is a certain angle, which causes a certain eccentric angle when the pull rod 4 is pulled down. Therefore, the eccentric connecting rod 11 is used to correct the angle, so that the force of the pull rod 4 pressing down is always at the same angle, and the force is not dispersed. Finally, the drive cam 14 provides a bottom dead center stop angle to complete the blanking, stretching and unloading work. Moreover, it eliminates the problem of poor stability caused by spring pressing, further avoids the impact of traditional cutting edge and the secondary mold impact after blanking and stretching, extends the service life of the mold and improves the quality of the stamping process.

[0030] In this embodiment, the motion trajectory of the effort-saving link 16 is required as follows: From 280° to 40°, the cam rotates 60 degrees, the active cam 14 (which rotates counterclockwise) moves upward from the lowest point, and the effort-saving link 16 moves from the highest point to the horizontal point; From 40° to 120°, the active cam 14 moves to the highest point and rotates 40°, while the effort-saving link 16 moves to the top; From 120° to 160°, the effort-saving link 16 is in a stopped state at the top – at this time, the stop operation of the pull rod 4 is achieved; From 1 When the cam rotates 50 degrees from 60° to 210°, the effort-saving link 16 moves from the top to the horizontal position. When the cam rotates 210° to 280°, one motion cycle ends and the effort-saving link 16 moves from the horizontal position to the bottom. The operation of one motion cycle is as follows: the machine tool spindle on the punch press frame 1 drives the active cam 14, the active cam 14 generates torque to drive the effort-saving link 16, the lever movement of the effort-saving link 16, and the constraint of the lower force point of the slider 20, ultimately drive the pull rod 4 to move up and down to complete one punching cycle.

[0031] 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 bottom dead center stop and limit structure for a linkage of a punch press, comprising a punch press frame (1), wherein a punch (2) capable of being pressed down and a lower die holder (3) located below the punch (2) are provided on the punch press frame (1), characterized in that: The lower die base (3) is provided with a sliding channel (301). A pull rod (4) is movably inserted into the sliding channel (301). A guide fixing plate (5) is provided on the part of the pull rod (4) that extends out of the sliding channel (301). One or more guide pillars (6) are provided on the guide fixing plate (5). A guide fixing plate (7) is connected between the upper parts of all the guide pillars (6). A cutting fixing plate (8) is also provided between all the guide pillars (6). The cutting fixing plate (8) is also provided on the punch press frame (1). A cutting die (9) is provided on the cutting fixing plate (8). A cutting and pressing blade (10) is provided below the guide fixing plate (7). The punch (2) can be inserted into the cutting die (9) after passing through the guide fixing plate (7) and the cutting and pressing blade (10). A bias rod is sleeved on the outside of the pull rod (4) that extends out of the sliding channel (301). The lower die holder (3) is provided with a connecting rod bracket (12) on its side. The connecting rod bracket (12) is hinged with a blanking stretching limiting component that can adjust the eccentric connecting rod (11) for displacement compensation and correction, and can limit the pull rod (4). The blanking stretching limiting component includes a transmission chain (13) connected to the punch press spindle at one end, an active cam (14), a follower wheel (15), and a force-saving connecting rod (16). The effort-saving link (16) is hinged to the link bracket (12) through hinge point one (161). One end of the effort-saving link (16) is hinged to the follower wheel (15) through hinge point two (162). The other end of the effort-saving link (16) is connected to the eccentric link (11). The other end of the transmission chain (13) is connected to the drive cam (14). The drive cam (14) cooperates with the follower wheel (15).

2. The connecting rod bottom dead center stopper structure for punch linkage according to claim 1, characterized in that: The hinge point 1 (161) on the force-saving link (16) and one end of the force-saving link (16) occupy one-third of the entire force-saving link (16), and the hinge point 1 (161) on the force-saving link (16) and one end of the force-saving link (16) occupy two-thirds of the entire force-saving link (16), and the follower wheel (15) is located at the end point of the force-saving link (16) which is two-thirds of the distance between the hinge point 1 (161) and the force-saving link (16).

3. The connecting rod bottom dead center stopper structure for punch linkage according to claim 2, characterized in that: The force-saving connecting rod (16) has a notch (163) at one end, and a positioning bracket (17) is inserted into the notch (163). The positioning bracket (17) is threadedly connected to the notch (163) by one or more mounting screws (18). The follower wheel (15) is hinged below the positioning bracket (17).

4. The connecting rod bottom dead center stopper structure for punch linkage according to claim 1 or 2 or 3, characterized in that: The pull rod (4) includes an upper rod body (401) and a lower rod body (402). The lower part of the upper rod body (401) is provided with an external threaded part (403), and the upper part of the lower rod body (402) is provided with an external threaded part (404). A pull rod connecting block (181) is provided between the upper rod body (401) and the lower rod body (402). An internal threaded sleeve (19) is provided in the pull rod connecting block (181) and threadedly connected to the external threaded part (403) and the external threaded part (404). The eccentric connecting rod (11) is provided outside the lower rod body (402).

5. The lower dead center stop and limit structure for the linkage of a punch press according to claim 4, characterized in that: A slider (20) is also sleeved on the outer side below the lower rod body (402). A guide rail (21) is provided on the punch press frame (1). The slider (20) is slidably connected to the guide rail (21). The slider (20) is hinged and positioned on the pull rod (4) after the positioning shaft (22) passes through the slider (20) and the pull rod (4).

6. The connecting rod bottom dead center stopper structure for punch linkage according to claim 4, characterized in that: The eccentric connecting rod (11) and the lower rod body (402) are connected by a positioning shaft two (25). The positioning shaft two (25) passes through the eccentric connecting rod (11) and the lower rod body (402) laterally to hinge the eccentric connecting rod (11) on the pull rod (4). The positioning shaft two (25) is fitted with an anti-slip bushing (251).

7. The connecting rod bottom dead center stopper structure for punch linkage according to claim 1, characterized in that: Two positioning posts (26) are provided at intervals below the lower mold base (3). A pull rod guide plate (23) is fixed between the two positioning posts (26) by a locking screw (24). The pull rod (4) passes through the pull rod guide plate (23) and is connected to the eccentric connecting rod (11).

8. The connecting rod bottom dead center stopper structure for punch linkage according to claim 1, characterized in that: A limiting boss (27) is provided above the pull rod (4), and the limiting boss (27) is threadedly connected to the guide fixing plate (5) by one or more positioning screws (28).

9. The lower dead center stop and limit structure for the linkage of a punch press according to claim 1, 2, or 3, characterized in that: There are four guide posts (6), and the four guide posts (6) are located on the four sides of the outside of the pull rod (4).

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