Die cutting material blocking mechanism of cold header

Abstract

The utility model discloses a die-cutting material blocking mechanism of a cold header. The die-cutting material blocking mechanism of the cold header is installed at an outlet of a forming die station of the cold header. The forming die station is used for conducting upsetting, punching and other procedures on the blank and provided with a plurality of forming dies, and the opening direction of the dies is consistent with the ejection direction of the ejector rod. The striker plate is connected with the back-and-forth lifting mechanism through the lifting arm, the lower end of the striker plate is located below a die station outlet in the initial state, and blank feeding is not affected. The back-and-forth lifting mechanism adopts a chain type transmission structure of driving shaft-cam-driving swing arm-transmission swing arm-driving swing rod-lifting arm, the cost and maintenance difficulty are reduced, the elastic bending performance of the striker plate enables the striker plate to be tightly attached to a machined material, meanwhile, the pushing force of the ejector rod and the elastic force of the striker plate jointly act, and therefore the machining efficiency is improved. And a processing material is clamped between the ejection mechanism and the ejection mechanism, so that the problem of empty clamping caused by over-high ejection speed is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold heading machines, and particularly relates to a die-cutting material blocking mechanism for cold heading machines, which is particularly suitable for stably clamping and transferring forming materials in a short material multi-process forming process. Background Art

[0002] Cold heading machines are essential equipment for metal plastic forming. Using multi-station dies, they progressively perform processes such as upsetting, punching, chamfering, and thread rolling on metal materials, ultimately creating fasteners or parts with specific shapes. In existing technology, after forming, the material is typically quickly ejected from the mold station by an ejector pin, allowing the clamp to transfer it to the next process. However, for short materials (such as billets whose length is less than the depth of the mold station), the ejector pin can eject too quickly, causing the formed material to instantly escape the mold. This can cause the clamp to "gap" due to delayed response or positioning errors, seriously affecting equipment operational stability and product qualification rates.

[0003] Existing solutions to this problem often involve adding fixed blocks at the die exit. However, these blocks cannot adapt to different sizes of workpieces and lack buffering capacity, which can easily damage the workpiece surface. Some solutions use elastic stoppers, but their lifting and lowering mechanisms are complex (such as using multiple cylinder linkages), which are not only costly but also suffer from poor synchronization and difficult maintenance. Therefore, a die-cutting stopper with a simple structure, reliable clamping, and strong adaptability is urgently needed to solve the problem of gaps when ejecting short materials. Utility Model Content

[0004] In order to solve the above problems, the purpose of this utility model is to provide a die-cutting material blocking mechanism for a cold heading machine, which can achieve stable clamping of short-length forming materials through the coordinated action of the elastic material blocking plate and the reciprocating lifting mechanism, avoid empty clamping of the clamps, and improve the operating reliability of the equipment.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a die-cutting material blocking mechanism of a cold heading machine, comprising a frame, on which a forming die station, a material blocking plate, and a reciprocating lifting mechanism are mounted; a material blocking plate that can move up and down is provided at the opening of the forming die station, the material blocking plate being a metal strip with elastic bending performance; the reciprocating lifting mechanism comprises:

[0006] A drive shaft is rotatably mounted on the frame and driven by a motor;

[0007] A fixed seat, fixed on the frame, provided with a lower rotating shaft and an upper rotating shaft;

[0008] A driving rocker arm is fixedly connected to the upper rotating shaft;

[0009] A positioning rocker arm is sleeved on the lower rotating shaft and can rotate around it;

[0010] The lifting arm has a lower end rotatably connected to the positioning rocker arm through a second pin shaft, a middle portion rotatably connected to the driving rocker arm through a first pin shaft, and an upper end fixedly connected to the lower end of the baffle plate;

[0011] The reciprocating lifting mechanism also includes a transmission assembly, which includes a "V"-shaped driving swing arm, one end of which is equipped with a roller and contacts the cam, and the other end is rotatably connected to the driving swing arm through a third pin shaft;

[0012] The transmission swing arm has the other end rotatably connected to one end of a swing plate through a fourth pin shaft; the other end of the swing plate is fixed on the upper rotating shaft. When the driving shaft rotates, the "V"-shaped driving swing arm is pushed to swing by the cam, and then the swing plate is pulled to swing through the transmission swing arm, and then the upper rotating shaft is driven to rotate, so that the driving swing rod rotates around the upper rotating shaft, and finally the lifting arm is driven to drive the material blocking plate to move up and down.

[0013] The lifting arm is provided with a positioning groove matching the end of the baffle plate, and the end of the baffle plate is clamped in the positioning groove and fixedly connected by screws.

[0014] A retractable reset rod is mounted on the frame and is provided with a reset spring. Under the elastic force of the reset spring, the reset rod abuts against the V-shaped drive swing arm so that the reset rod always keeps in contact with the cam.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] High clamping reliability: Through the coordinated action of the elastic baffle plate and the ejector rod, continuous clamping force can be provided at the moment of ejection of short materials, avoiding the problem of clamping space caused by excessive ejection speed, and significantly improving the operation stability of the equipment.

[0017] Compact and efficient structure: The reciprocating lifting mechanism adopts a chain transmission structure of "drive shaft-cam-drive swing arm-transmission swing arm-drive rocker-lifting arm". Only a single motor drive is required to realize the reciprocating motion of the material baffle plate, reducing the use of components such as cylinders and sensors, reducing costs and maintenance difficulties. The elastic bending performance of the material baffle plate enables it to fit closely with the workpiece. At the same time, the thrust of the ejector rod and the elastic force of the material baffle plate work together to clamp the workpiece between the two. The clamp can stably clamp the workpiece and transfer it to the next process, avoiding the problem of empty space caused by excessive ejection speed.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a specific embodiment of the utility model;

[0020] Figure 2It is a side view of a specific embodiment of the utility model;

[0021] Figure 3 This is a three-dimensional diagram of the material baffle plate in the rising state in the specific embodiment of the present invention;

[0022] Figure 4 It is a three-dimensional diagram of the material blocking plate in the downward moving state in a specific embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1-frame; 2-forming mold station; 3-blocking plate; 4-lifting arm; 5-driving shaft; 6-fixed seat; 7-lower rotating shaft; 8-upper rotating shaft; 9-driving rocker arm; 10-positioning rocker arm; 11-transmission rocker arm; 12-"V"-shaped driving rocker arm; 13-cam; 14-swinging plate; 20-reset lever. DETAILED DESCRIPTION

[0025] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] like Figure 1 — Figure 4 As shown, this embodiment discloses a die-cutting stopper mechanism for a cold heading machine. This mechanism is installed at the exit of the forming die station 2 of the cold heading machine. Forming die station 2 is used to perform processes such as upsetting and punching on the blank. Forming die station 2 comprises multiple forming dies, the opening direction of which aligns with the ejection direction of an ejector pin (not shown). A stopper plate 3 is connected to the reciprocating lift mechanism via a lift arm 4. Initially, the lower end of the stopper plate 3 is positioned below the exit of the die station 2, preventing the blank from being fed.

[0027] After the blank is formed by the mold station 2, the ejector starts and quickly ejects the processed material from the mold station 2. At this time, the motor drives the drive shaft 5 to rotate, and the cam 13 at the end of the drive shaft 5 rotates accordingly and pushes the "V"-shaped drive swing arm 12 to swing. The "V"-shaped drive swing arm 12 drives the transmission swing arm 11 to swing through the third pin shaft. The other end of the transmission swing arm 11 is rotatably connected to one end of a swing plate 14 through the fourth pin shaft. The other end of the swing plate 14 is fixed to the upper rotating shaft 8. When the drive shaft 5 rotates, the cam 13 pushes the "V"-shaped drive swing arm 12 to swing, and then the transmission swing arm 11 pulls the swing plate 14 to swing, and then drives the upper rotating shaft 8 to rotate. This makes the drive swing rod 9 rotate around the upper rotating shaft 8, and finally drives the lifting arm 4 to drive the material blocking plate 3 to move up and down.

[0028] Fixed base 6 is fixed to frame 1 and is provided with lower shaft 7 and upper shaft 8. Transmission swing arm 11 drives driving swing rod 9 to rotate counterclockwise around upper shaft 8. Driving swing rod 9 drives the middle portion of lifting arm 4 upward via the first pin. Simultaneously, positioning swing rod 10 rotates clockwise around lower shaft 7, exerting an upward restraining force on the lower end of lifting arm 4, causing the entire lifting arm 4 to move vertically upward, driving retaining plate 3 to rise above the exit of mold station 2.

[0029] Among them, the lifting arm 4 is provided with a positioning groove that matches the end of the baffle plate 3. The end of the baffle plate 3 is clamped in the positioning groove and fixedly connected by screws, ensuring that the baffle plate is installed more reliably and at the same time ensuring its reliable elastic bending.

[0030] A retractable reset rod 20 is mounted on the frame. A reset spring is provided on the reset rod 20. Under the elastic force of the reset spring, the reset rod abuts against the V-shaped drive swing arm 12, so that the reset rod always maintains contact with the cam 13. This ensures that the transmission between the cam 13 and the drive swing arm 12 is more reliable and stable.

[0031] At this point, the punching die and forming die collide to form the workpiece material, especially the shorter pieces. The front ends of these pieces are pushed by the ejector pins onto the retaining plate 3. The elastic bending properties of the retaining plate 3 allow it to fit tightly against the workpiece material. At the same time, the thrust of the ejector pin and the elastic force of the retaining plate work together to clamp the workpiece material between them. The clamp can stably clamp the workpiece material and transfer it to the next process, avoiding the problem of empty space caused by excessive ejection speed.

[0032] When the processed material is transferred, the motor drive shaft 5 rotates, and the high point of the cam 13 is converted to the low point and contacts the "V"-shaped driving swing arm 12, so that the "V"-shaped driving swing arm 12 returns to its position, driving the rocker arm 9 to rotate clockwise around the upper rotating shaft 8, and the lifting arm 4 moves vertically downward under the constraint of the positioning rocker arm 10, driving the material baffle 3 to descend and reset to its initial position, preparing for the next cycle.

[0033] The beneficial effects achieved by adopting the above-mentioned embodiment are as follows: the reciprocating lifting mechanism adopts a chain transmission structure of "drive shaft-cam-drive swing arm-transmission swing arm-drive rocker rod-lifting arm", and only a single motor drive is required to realize the reciprocating motion of the material baffle plate, which reduces the use of components such as cylinders and sensors, reduces costs and maintenance difficulties, and the elastic bending performance of the material baffle plate enables it to fit tightly with the processed material. At the same time, the thrust of the ejector rod and the elastic force of the material baffle plate work together to clamp the processed material between the two. The clamp can stably clamp the processed material and transfer it to the next process, avoiding the problem of empty clamping caused by excessive ejection speed.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A die-cutting and material-blocking mechanism for a cold heading machine, comprising a frame, characterized in that: A forming mold station (2), a baffle plate (3) and a reciprocating lifting mechanism are installed on the frame; a baffle plate (3) that can move up and down is provided at the opening of the forming mold station (2), and the baffle plate (3) is a metal strip with elastic bending performance; the reciprocating lifting mechanism includes: A drive shaft (5) is rotatably mounted on the frame (1) and driven by a motor; A fixed seat (6) is fixed on the frame (1) and is provided with a lower rotating shaft (7) and an upper rotating shaft (8); A driving rocker (9) fixedly connected to the upper rotating shaft (8); A positioning rocker (10) is sleeved on the lower rotating shaft (7) and can rotate around it; A lifting arm (4), the lower end of which is rotatably connected to the positioning rocker (10) via a second pin shaft, the middle portion of which is rotatably connected to the driving rocker (9) via a first pin shaft, and the upper end of which is fixedly connected to the lower end of the baffle plate (3); The reciprocating lifting mechanism also includes a transmission assembly, which includes: a "V"-shaped driving swing arm (12), one end of which is equipped with a roller and contacts the cam (13), and the other end is rotatably connected to the driving swing arm (11) through a third pin shaft; The other end of the transmission swing arm (11) is rotatably connected to one end of a swing plate (14) through a fourth pin shaft; the other end of the swing plate (14) is fixed on the upper rotating shaft (8). When the driving shaft (5) rotates, the cam (13) pushes the "V"-shaped driving swing arm (12) to swing, and then the transmission swing arm (11) pulls the swing plate (14) to swing, and then drives the upper rotating shaft (8) to rotate, so that the driving swing rod (9) rotates around the upper rotating shaft (8), and finally drives the lifting arm (4) to drive the baffle plate (3) to move up and down.

2. The die-cutting stopper mechanism according to claim 1, characterized in that: The lifting arm (4) is provided with a positioning groove that matches the end of the material baffle plate (3), and the end of the material baffle plate (3) is clamped in the positioning groove and fixedly connected by screws.

3. The die-cutting stopper mechanism according to claim 1, characterized in that: A retractable reset rod (20) is mounted on the frame. A reset spring is disposed on the reset rod (20). The reset rod abuts against the V-shaped drive swing arm (12) under the elastic force of the reset spring, so that the reset rod always maintains contact with the cam (13).

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